*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/libpq/ip.c,v 1.7 2003/04/22 03:52:56 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/libpq/ip.c,v 1.8 2003/06/08 17:42:59 tgl Exp $
*
* This file and the IPV6 implementation were initially provided by
* Nigel Kukard <nkukard@lbsd.net>, Linux Based Systems Design
/*
- * freeaddrinfo2 - free IPv6 addrinfo structures
+ * freeaddrinfo2 - free addrinfo structures for IPv4, IPv6, or Unix
*/
void
-freeaddrinfo2(int hint_ai_family, struct addrinfo *ai)
+freeaddrinfo2(struct addrinfo *ai)
{
-#ifdef HAVE_UNIX_SOCKETS
- if (hint_ai_family == AF_UNIX)
+ if (ai != NULL)
{
- struct addrinfo *p;
-
- while (ai != NULL)
+#ifdef HAVE_UNIX_SOCKETS
+ if (ai->ai_family == AF_UNIX)
{
- p = ai;
- ai = ai->ai_next;
- free(p->ai_addr);
- free(p);
+ while (ai != NULL)
+ {
+ struct addrinfo *p = ai;
+
+ ai = ai->ai_next;
+ free(p->ai_addr);
+ free(p);
+ }
}
- }
- else
+ else
#endif /* HAVE_UNIX_SOCKETS */
- freeaddrinfo(ai);
+ freeaddrinfo(ai);
+ }
}
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Header: /cvsroot/pgsql/src/backend/libpq/pqcomm.c,v 1.154 2003/05/29 19:15:34 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/libpq/pqcomm.c,v 1.155 2003/06/08 17:43:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
{
elog(LOG, "server socket failure: getaddrinfo2(): %s",
gai_strerror(ret));
- if (addrs != NULL)
- freeaddrinfo2(hint.ai_family, addrs);
+ freeaddrinfo2(addrs);
return STATUS_ERROR;
}
{
elog(LOG, "server socket failure: socket(): %s",
strerror(errno));
- freeaddrinfo2(hint.ai_family, addrs);
+ freeaddrinfo2(addrs);
return STATUS_ERROR;
}
{
elog(LOG, "server socket failure: setsockopt(SO_REUSEADDR): %s",
strerror(errno));
- freeaddrinfo2(hint.ai_family, addrs);
+ freeaddrinfo2(addrs);
return STATUS_ERROR;
}
}
sock_path);
else
elog(LOG, "\tIf not, wait a few seconds and retry.");
- freeaddrinfo2(hint.ai_family, addrs);
+ freeaddrinfo2(addrs);
return STATUS_ERROR;
}
{
if (Setup_AF_UNIX() != STATUS_OK)
{
- freeaddrinfo2(hint.ai_family, addrs);
+ freeaddrinfo2(addrs);
return STATUS_ERROR;
}
}
{
elog(LOG, "server socket failure: listen(): %s",
strerror(errno));
- freeaddrinfo2(hint.ai_family, addrs);
+ freeaddrinfo2(addrs);
return STATUS_ERROR;
}
*fdP = fd;
- freeaddrinfo2(hint.ai_family, addrs);
+ freeaddrinfo2(addrs);
return STATUS_OK;
}
*
* Copyright (c) 2003, PostgreSQL Global Development Group
*
- * $Id: ip.h,v 1.3 2003/04/02 00:49:28 tgl Exp $
+ * $Id: ip.h,v 1.4 2003/06/08 17:43:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
extern int getaddrinfo2(const char *hostname, const char *servname,
const struct addrinfo *hintp,
struct addrinfo **result);
-extern void freeaddrinfo2(int hint_ai_family, struct addrinfo *ai);
+extern void freeaddrinfo2(struct addrinfo *ai);
extern char *SockAddr_ntop(const SockAddr *sa, char *dst, size_t cnt,
int v4conv);
#
# Copyright (c) 1994, Regents of the University of California
#
-# $Header: /cvsroot/pgsql/src/interfaces/libpq/Makefile,v 1.79 2003/05/10 02:05:50 momjian Exp $
+# $Header: /cvsroot/pgsql/src/interfaces/libpq/Makefile,v 1.80 2003/06/08 17:43:00 tgl Exp $
#
#-------------------------------------------------------------------------
override CPPFLAGS := -I$(srcdir) $(CPPFLAGS) -DFRONTEND -DSYSCONFDIR='"$(sysconfdir)"'
OBJS= fe-auth.o fe-connect.o fe-exec.o fe-misc.o fe-print.o fe-lobj.o \
- pqexpbuffer.o pqsignal.o fe-secure.o \
+ fe-protocol2.o fe-protocol3.o pqexpbuffer.o pqsignal.o fe-secure.o \
dllist.o md5.o ip.o wchar.o encnames.o \
$(filter crypt.o getaddrinfo.o inet_aton.o snprintf.o strerror.o path.o, $(LIBOBJS))
* exceed INITIAL_EXPBUFFER_SIZE (currently 256 bytes).
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-auth.c,v 1.78 2003/05/16 04:58:03 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-auth.c,v 1.79 2003/06/08 17:43:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
default:
return STATUS_ERROR;
}
- ret = pqPacketSend(conn, 'p', crypt_pwd, strlen(crypt_pwd) + 1);
+ /* Packet has a message type as of protocol 3.0 */
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ ret = pqPacketSend(conn, 'p', crypt_pwd, strlen(crypt_pwd) + 1);
+ else
+ ret = pqPacketSend(conn, 0, crypt_pwd, strlen(crypt_pwd) + 1);
if (areq == AUTH_REQ_MD5)
free(crypt_pwd);
return ret;
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.241 2003/05/15 16:35:30 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.242 2003/06/08 17:43:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "mb/pg_wchar.h"
-#ifdef WIN32
-static int
-inet_aton(const char *cp, struct in_addr * inp)
-{
- unsigned long a = inet_addr(cp);
-
- if (a == -1)
- return 0;
- inp->s_addr = a;
- return 1;
-}
-#endif
+#define PGPASSFILE ".pgpass"
+/* fall back options if they are not specified by arguments or defined
+ by environment variables */
+#define DefaultHost "localhost"
+#define DefaultTty ""
+#define DefaultOption ""
+#define DefaultAuthtype ""
+#define DefaultPassword ""
-#define PGPASSFILE ".pgpass"
/* ----------
* Definition of the conninfo parameters and their fallback resources.
* fallback is available. If after all no value can be determined
* for an option, an error is returned.
*
- * The values for dbname and user are treated specially in conninfo_parse.
+ * The value for the username is treated specially in conninfo_parse.
* If the Compiled-in resource is specified as a NULL value, the
- * user is determined by fe_getauthname() and for dbname the user
- * name is copied.
+ * user is determined by fe_getauthname().
*
* The Label and Disp-Char entries are provided for applications that
* want to use PQconndefaults() to create a generic database connection
NULL, NULL, 0}
};
-static const struct EnvironmentOptions
-{
- const char *envName,
- *pgName;
-} EnvironmentOptions[] =
-
+static const PQEnvironmentOption EnvironmentOptions[] =
{
/* common user-interface settings */
{
PQExpBuffer errorMessage);
static char *conninfo_getval(PQconninfoOption *connOptions,
const char *keyword);
-static int build_startup_packet(const PGconn *conn, char *packet);
static void defaultNoticeProcessor(void *arg, const char *message);
static int parseServiceInfo(PQconninfoOption *options,
PQExpBuffer errorMessage);
/* ----------
* connectDBStart -
- * Start to make a connection to the backend so it is ready to receive
- * queries.
+ * Begin the process of making a connection to the backend.
+ *
* Returns 1 if successful, 0 if not.
* ----------
*/
int portnum;
char portstr[64];
struct addrinfo *addrs = NULL;
- struct addrinfo *addr_cur = NULL;
struct addrinfo hint;
const char *node = NULL;
- const char *unix_node = "unix";
int ret;
if (!conn)
return 0;
- /* Initialize hint structure */
- MemSet(&hint, 0, sizeof(hint));
- hint.ai_socktype = SOCK_STREAM;
-
/* Ensure our buffers are empty */
conn->inStart = conn->inCursor = conn->inEnd = 0;
conn->outCount = 0;
/*
- * Set up the connection to postmaster/backend.
+ * Determine the parameters to pass to getaddrinfo2.
*/
- MemSet((char *) &conn->raddr, 0, sizeof(conn->raddr));
+ /* Initialize hint structure */
+ MemSet(&hint, 0, sizeof(hint));
+ hint.ai_socktype = SOCK_STREAM;
- /* Set port number */
+ /* Set up port number as a string */
if (conn->pgport != NULL && conn->pgport[0] != '\0')
portnum = atoi(conn->pgport);
else
{
/* pghostaddr and pghost are NULL, so use Unix domain socket */
#ifdef HAVE_UNIX_SOCKETS
- node = unix_node;
+ node = "unix";
hint.ai_family = AF_UNIX;
UNIXSOCK_PATH(conn->raddr.un, portnum, conn->pgunixsocket);
conn->raddr_len = UNIXSOCK_LEN(conn->raddr.un);
StrNCpy(portstr, conn->raddr.un.sun_path, sizeof(portstr));
-#ifdef USE_SSL
- /* Don't bother requesting SSL over a Unix socket */
- conn->allow_ssl_try = false;
- conn->require_ssl = false;
-#endif
#endif /* HAVE_UNIX_SOCKETS */
}
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("getaddrinfo() failed: %s\n"),
gai_strerror(ret));
+ freeaddrinfo2(addrs);
goto connect_errReturn;
}
/*
- * We loop over the possible addresses returned by getaddrinfo2(),
- * and fail only when they all fail (reporting the error returned
- * for the *last* alternative, which may not be what users expect
- * :-().
- *
- * Notice we never actually fall out of the loop; the only exits are
- * via "break" or "goto connect_errReturn". Thus, there is no exit
- * test in the for().
+ * Set up to try to connect, with protocol 3.0 as the first attempt.
*/
- for (addr_cur = addrs; ; addr_cur = addr_cur->ai_next)
- {
- /* Open a socket */
- conn->sock = socket(addr_cur->ai_family, SOCK_STREAM,
- addr_cur->ai_protocol);
- if (conn->sock < 0)
- {
- /* ignore socket() failure if we have more addrs to try */
- if (addr_cur->ai_next != NULL)
- continue;
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("could not create socket: %s\n"),
- SOCK_STRERROR(SOCK_ERRNO));
- goto connect_errReturn;
- }
-
- /*
- * Set the right options. Normally, we need nonblocking I/O, and we
- * don't want delay of outgoing data for AF_INET sockets. If we are
- * using SSL, then we need the blocking I/O (XXX Can this be fixed?).
- */
-
- if (isAF_INETx(addr_cur->ai_family))
- {
- if (!connectNoDelay(conn))
- goto connect_errReturn;
- }
-
-#if !defined(USE_SSL)
- if (connectMakeNonblocking(conn) == 0)
- goto connect_errReturn;
-#endif
-
- /* ----------
- * Start / make connection. We are hopefully in non-blocking mode
- * now, but it is possible that:
- * 1. Older systems will still block on connect, despite the
- * non-blocking flag. (Anyone know if this is true?)
- * 2. We are using SSL.
- * Thus, we have to make arrangements for all eventualities.
- * ----------
- */
-retry1:
- if (connect(conn->sock, addr_cur->ai_addr, addr_cur->ai_addrlen) < 0)
- {
- if (SOCK_ERRNO == EINTR)
- /* Interrupted system call - we'll just try again */
- goto retry1;
-
- if (SOCK_ERRNO == EINPROGRESS || SOCK_ERRNO == EWOULDBLOCK || SOCK_ERRNO == 0)
- {
- /*
- * This is fine - we're in non-blocking mode, and the
- * connection is in progress.
- */
- conn->status = CONNECTION_STARTED;
- break;
- }
- /* otherwise, trouble */
- }
- else
- {
- /* We're connected already */
- conn->status = CONNECTION_MADE;
- break;
- }
- /*
- * This connection failed. We need to close the socket,
- * and either loop to try the next address or report an error.
- */
- /* ignore connect() failure if we have more addrs to try */
- if (addr_cur->ai_next != NULL)
- {
- closesocket(conn->sock);
- conn->sock = -1;
- continue;
- }
- /* copy failed address for error report */
- memcpy(&conn->raddr, addr_cur->ai_addr, addr_cur->ai_addrlen);
- conn->raddr_len = addr_cur->ai_addrlen;
- connectFailureMessage(conn, SOCK_ERRNO);
- goto connect_errReturn;
- } /* loop over addrs */
-
- /* Remember the successfully opened address alternative */
- memcpy(&conn->raddr, addr_cur->ai_addr, addr_cur->ai_addrlen);
- conn->raddr_len = addr_cur->ai_addrlen;
- /* and release the address list */
- freeaddrinfo2(hint.ai_family, addrs);
- addrs = NULL;
-
-#ifdef USE_SSL
- /* Attempt to negotiate SSL usage */
- if (conn->allow_ssl_try)
- {
- ProtocolVersion pv;
- char SSLok;
-
- pv = htonl(NEGOTIATE_SSL_CODE);
- if (pqPacketSend(conn, 0, &pv, sizeof(ProtocolVersion)) != STATUS_OK)
- {
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("could not send SSL negotiation packet: %s\n"),
- SOCK_STRERROR(SOCK_ERRNO));
- goto connect_errReturn;
- }
-retry2:
- /* Now receive the postmasters response */
- if (recv(conn->sock, &SSLok, 1, 0) != 1)
- {
- if (SOCK_ERRNO == EINTR)
- /* Interrupted system call - we'll just try again */
- goto retry2;
-
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("could not receive server response to SSL negotiation packet: %s\n"),
- SOCK_STRERROR(SOCK_ERRNO));
- goto connect_errReturn;
- }
- if (SSLok == 'S')
- {
- if (pqsecure_initialize(conn) == -1 ||
- pqsecure_open_client(conn) == -1)
- goto connect_errReturn;
- /* SSL connection finished. Continue to send startup packet */
- }
- else if (SSLok == 'E')
- {
- /* Received error - probably protocol mismatch */
- if (conn->Pfdebug)
- fprintf(conn->Pfdebug, "Postmaster reports error, attempting fallback to pre-7.0.\n");
- pqsecure_close(conn);
- closesocket(conn->sock);
- conn->sock = -1;
- conn->allow_ssl_try = FALSE;
- return connectDBStart(conn);
- }
- else if (SSLok != 'N')
- {
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("received invalid response to SSL negotiation: %c\n"),
- SSLok);
- goto connect_errReturn;
- }
- }
- if (conn->require_ssl && !conn->ssl)
- {
- /* Require SSL, but server does not support/want it */
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("server does not support SSL, but SSL was required\n"));
- goto connect_errReturn;
- }
-#endif
+ conn->addrlist = addrs;
+ conn->addr_cur = addrs;
+ conn->pversion = PG_PROTOCOL(3,0);
+ conn->status = CONNECTION_NEEDED;
/*
- * This makes the connection non-blocking, for all those cases which
- * forced us not to do it above.
+ * The code for processing CONNECTION_NEEDED state is in PQconnectPoll(),
+ * so that it can easily be re-executed if needed again during the
+ * asynchronous startup process. However, we must run it once here,
+ * because callers expect a success return from this routine to mean
+ * that we are in PGRES_POLLING_WRITING connection state.
*/
-#if defined(USE_SSL)
- if (connectMakeNonblocking(conn) == 0)
- goto connect_errReturn;
-#endif
-
- return 1;
+ if (PQconnectPoll(conn) == PGRES_POLLING_WRITING)
+ return 1;
connect_errReturn:
if (conn->sock >= 0)
conn->sock = -1;
}
conn->status = CONNECTION_BAD;
- if (addrs != NULL)
- freeaddrinfo2(hint.ai_family, addrs);
return 0;
}
* o If you call PQtrace, ensure that the stream object into which you trace
* will not block.
* o If you do not supply an IP address for the remote host (i.e. you
- * supply a host name instead) then this function will block on
+ * supply a host name instead) then PQconnectStart will block on
* gethostbyname. You will be fine if using Unix sockets (i.e. by
* supplying neither a host name nor a host address).
* o If your backend wants to use Kerberos authentication then you must
* supply both a host name and a host address, otherwise this function
* may block on gethostname.
- * o This function will block if compiled with USE_SSL.
*
* ----------------
*/
case CONNECTION_MADE:
break;
+ /* We allow pqSetenvPoll to decide whether to proceed. */
+ case CONNECTION_SETENV:
+ break;
+
+ /* Special cases: proceed without waiting. */
+ case CONNECTION_SSL_STARTUP:
+ case CONNECTION_NEEDED:
+ break;
+
default:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
keep_going: /* We will come back to here until there
- * is nothing left to parse. */
+ * is nothing left to do. */
switch (conn->status)
{
+ case CONNECTION_NEEDED:
+ {
+ /*
+ * Try to initiate a connection to one of the addresses
+ * returned by getaddrinfo2(). conn->addr_cur is the
+ * next one to try. We fail when we run out of addresses
+ * (reporting the error returned for the *last* alternative,
+ * which may not be what users expect :-().
+ */
+ while (conn->addr_cur != NULL)
+ {
+ struct addrinfo *addr_cur = conn->addr_cur;
+
+ /* Remember current address for possible error msg */
+ memcpy(&conn->raddr, addr_cur->ai_addr,
+ addr_cur->ai_addrlen);
+ conn->raddr_len = addr_cur->ai_addrlen;
+
+ /* Open a socket */
+ conn->sock = socket(addr_cur->ai_family,
+ SOCK_STREAM,
+ addr_cur->ai_protocol);
+ if (conn->sock < 0)
+ {
+ /*
+ * ignore socket() failure if we have more addresses
+ * to try
+ */
+ if (addr_cur->ai_next != NULL)
+ {
+ conn->addr_cur = addr_cur->ai_next;
+ continue;
+ }
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("could not create socket: %s\n"),
+ SOCK_STRERROR(SOCK_ERRNO));
+ break;
+ }
+
+ /*
+ * Select socket options: no delay of outgoing data for
+ * TCP sockets, and nonblock mode. Fail if this fails.
+ */
+ if (isAF_INETx(addr_cur->ai_family))
+ {
+ if (!connectNoDelay(conn))
+ break;
+ }
+ if (connectMakeNonblocking(conn) == 0)
+ break;
+ /*
+ * Start/make connection. This should not block, since
+ * we are in nonblock mode. If it does, well, too bad.
+ */
+retry_connect:
+ if (connect(conn->sock, addr_cur->ai_addr,
+ addr_cur->ai_addrlen) < 0)
+ {
+ if (SOCK_ERRNO == EINTR)
+ /* Interrupted system call - just try again */
+ goto retry_connect;
+ if (SOCK_ERRNO == EINPROGRESS ||
+ SOCK_ERRNO == EWOULDBLOCK ||
+ SOCK_ERRNO == 0)
+ {
+ /*
+ * This is fine - we're in non-blocking mode,
+ * and the connection is in progress. Tell
+ * caller to wait for write-ready on socket.
+ */
+ conn->status = CONNECTION_STARTED;
+ return PGRES_POLLING_WRITING;
+ }
+ /* otherwise, trouble */
+ }
+ else
+ {
+ /*
+ * Hm, we're connected already --- seems the
+ * "nonblock connection" wasn't. Advance the state
+ * machine and go do the next stuff.
+ */
+ conn->status = CONNECTION_STARTED;
+ goto keep_going;
+ }
+ /*
+ * This connection failed --- set up error report,
+ * then close socket (do it this way in case close()
+ * affects the value of errno...). We will ignore the
+ * connect() failure and keep going if there are
+ * more addresses.
+ */
+ connectFailureMessage(conn, SOCK_ERRNO);
+ if (conn->sock >= 0)
+ {
+ closesocket(conn->sock);
+ conn->sock = -1;
+ }
+ /*
+ * Try the next address, if any.
+ */
+ conn->addr_cur = addr_cur->ai_next;
+ } /* loop over addresses */
+
+ /*
+ * Ooops, no more addresses. An appropriate error message
+ * is already set up, so just set the right status.
+ */
+ goto error_return;
+ }
+
case CONNECTION_STARTED:
{
ACCEPT_TYPE_ARG3 laddrlen;
/*
* Write ready, since we've made it here, so the
- * connection has been made.
+ * connection has been made ... or has failed.
*/
/*
* friendly error message.
*/
connectFailureMessage(conn, optval);
+ /*
+ * If more addresses remain, keep trying, just as in
+ * the case where connect() returned failure immediately.
+ */
+ if (conn->addr_cur->ai_next != NULL)
+ {
+ if (conn->sock >= 0)
+ {
+ closesocket(conn->sock);
+ conn->sock = -1;
+ }
+ conn->addr_cur = conn->addr_cur->ai_next;
+ conn->status = CONNECTION_NEEDED;
+ goto keep_going;
+ }
goto error_return;
}
goto error_return;
}
+ /*
+ * Make sure we can write before advancing to next step.
+ */
conn->status = CONNECTION_MADE;
return PGRES_POLLING_WRITING;
}
char *startpacket;
int packetlen;
+#ifdef USE_SSL
+ /*
+ * If SSL is enabled and we haven't already got it running,
+ * request it instead of sending the startup message.
+ */
+
+#ifdef HAVE_UNIX_SOCKETS
+ if (conn->raddr.sa.sa_family == AF_UNIX)
+ {
+ /* Don't bother requesting SSL over a Unix socket */
+ conn->allow_ssl_try = false;
+ conn->require_ssl = false;
+ }
+#endif
+ if (conn->allow_ssl_try && conn->ssl == NULL)
+ {
+ ProtocolVersion pv;
+
+ /*
+ * Send the SSL request packet.
+ *
+ * Theoretically, this could block, but it really shouldn't
+ * since we only got here if the socket is write-ready.
+ */
+ pv = htonl(NEGOTIATE_SSL_CODE);
+ if (pqPacketSend(conn, 0, &pv, sizeof(pv)) != STATUS_OK)
+ {
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("could not send SSL negotiation packet: %s\n"),
+ SOCK_STRERROR(SOCK_ERRNO));
+ goto error_return;
+ }
+ /* Ok, wait for response */
+ conn->status = CONNECTION_SSL_STARTUP;
+ return PGRES_POLLING_READING;
+ }
+#endif /* USE_SSL */
+
/*
* Build the startup packet.
*/
- packetlen = build_startup_packet(conn, NULL);
- startpacket = (char *) malloc(packetlen);
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ startpacket = pqBuildStartupPacket3(conn, &packetlen,
+ EnvironmentOptions);
+ else
+ startpacket = pqBuildStartupPacket2(conn, &packetlen,
+ EnvironmentOptions);
if (!startpacket)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("out of memory\n"));
goto error_return;
}
- packetlen = build_startup_packet(conn, startpacket);
/*
* Send the startup packet.
}
/*
- * Handle the authentication exchange: wait for postmaster
+ * Handle SSL negotiation: wait for postmaster
+ * messages and respond as necessary.
+ */
+ case CONNECTION_SSL_STARTUP:
+ {
+#ifdef USE_SSL
+ PostgresPollingStatusType pollres;
+
+ /*
+ * On first time through, get the postmaster's response
+ * to our SSL negotiation packet. Be careful to read only
+ * one byte (if there's more, it could be SSL data).
+ */
+ if (conn->ssl == NULL)
+ {
+ char SSLok;
+ int nread;
+
+retry_ssl_read:
+ nread = recv(conn->sock, &SSLok, 1, 0);
+ if (nread < 0)
+ {
+ if (SOCK_ERRNO == EINTR)
+ /* Interrupted system call - just try again */
+ goto retry_ssl_read;
+
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("could not receive server response to SSL negotiation packet: %s\n"),
+ SOCK_STRERROR(SOCK_ERRNO));
+ goto error_return;
+ }
+ if (nread == 0)
+ /* caller failed to wait for data */
+ return PGRES_POLLING_READING;
+ if (SSLok == 'S')
+ {
+ /* Do one-time setup; this creates conn->ssl */
+ if (pqsecure_initialize(conn) == -1)
+ goto error_return;
+ }
+ else if (SSLok == 'N')
+ {
+ if (conn->require_ssl)
+ {
+ /* Require SSL, but server does not want it */
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("server does not support SSL, but SSL was required\n"));
+ goto error_return;
+ }
+ /* Otherwise, proceed with normal startup */
+ conn->allow_ssl_try = false;
+ conn->status = CONNECTION_MADE;
+ return PGRES_POLLING_WRITING;
+ }
+ else if (SSLok == 'E')
+ {
+ /* Received error - probably protocol mismatch */
+ if (conn->Pfdebug)
+ fprintf(conn->Pfdebug, "Postmaster reports error, attempting fallback to pre-7.0.\n");
+ if (conn->require_ssl)
+ {
+ /* Require SSL, but server is too old */
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("server does not support SSL, but SSL was required\n"));
+ goto error_return;
+ }
+ /* Otherwise, try again without SSL */
+ conn->allow_ssl_try = false;
+ /* Assume it ain't gonna handle protocol 3, either */
+ conn->pversion = PG_PROTOCOL(2,0);
+ /* Must drop the old connection */
+ closesocket(conn->sock);
+ conn->sock = -1;
+ conn->status = CONNECTION_NEEDED;
+ goto keep_going;
+ }
+ else
+ {
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("received invalid response to SSL negotiation: %c\n"),
+ SSLok);
+ goto error_return;
+ }
+ }
+ /*
+ * Begin or continue the SSL negotiation process.
+ */
+ pollres = pqsecure_open_client(conn);
+ if (pollres == PGRES_POLLING_OK)
+ {
+ /* SSL handshake done, ready to send startup packet */
+ conn->status = CONNECTION_MADE;
+ return PGRES_POLLING_WRITING;
+ }
+ return pollres;
+#else /* !USE_SSL */
+ /* can't get here */
+ goto error_return;
+#endif /* USE_SSL */
+ }
+
+ /*
+ * Handle authentication exchange: wait for postmaster
* messages and respond as necessary.
*/
case CONNECTION_AWAITING_RESPONSE:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"expected authentication request from "
- "server, but received %c\n"
- ),
+ "server, but received %c\n"),
beresp);
goto error_return;
}
- /* Read message length word */
- if (pqGetInt(&msgLength, 4, conn))
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
{
- /* We'll come back when there is more data */
- return PGRES_POLLING_READING;
+ /* Read message length word */
+ if (pqGetInt(&msgLength, 4, conn))
+ {
+ /* We'll come back when there is more data */
+ return PGRES_POLLING_READING;
+ }
+ }
+ else
+ {
+ /* Set phony message length to disable checks below */
+ msgLength = 8;
}
/*
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"expected authentication request from "
- "server, but received %c\n"
- ),
+ "server, but received %c\n"),
beresp);
goto error_return;
}
* conventions.
*/
appendPQExpBufferChar(&conn->errorMessage, '\n');
+
+ /*
+ * If we tried to open the connection in 3.0 protocol,
+ * fall back to 2.0 protocol.
+ */
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ {
+ conn->pversion = PG_PROTOCOL(2,0);
+ /* Must drop the old connection */
+ pqsecure_close(conn);
+ closesocket(conn->sock);
+ conn->sock = -1;
+ conn->status = CONNECTION_NEEDED;
+ goto keep_going;
+ }
+
goto error_return;
}
/*
* Can't process if message body isn't all here yet.
+ *
+ * (In protocol 2.0 case, we are assuming messages carry
+ * at least 4 bytes of data.)
*/
msgLength -= 4;
avail = conn->inEnd - conn->inCursor;
/*
* Before returning, try to enlarge the input buffer if
* needed to hold the whole message; see notes in
- * parseInput.
+ * pqParseInput3.
*/
if (pqCheckInBufferSpace(conn->inCursor + msgLength, conn))
goto error_return;
/* Handle errors. */
if (beresp == 'E')
{
- if (pqGetErrorNotice(conn, true))
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
{
- /* We'll come back when there is more data */
- return PGRES_POLLING_READING;
+ if (pqGetErrorNotice3(conn, true))
+ {
+ /* We'll come back when there is more data */
+ return PGRES_POLLING_READING;
+ }
+ }
+ else
+ {
+ if (pqGets(&conn->errorMessage, conn))
+ {
+ /* We'll come back when there is more data */
+ return PGRES_POLLING_READING;
+ }
}
/* OK, we read the message; mark data consumed */
conn->inStart = conn->inCursor;
goto error_return;
}
- /*
- * We are open for business!
- */
+ /* We can release the address list now. */
+ freeaddrinfo2(conn->addrlist);
+ conn->addrlist = NULL;
+ conn->addr_cur = NULL;
+
+ /* Fire up post-connection housekeeping if needed */
+ if (PG_PROTOCOL_MAJOR(conn->pversion) < 3)
+ {
+ conn->status = CONNECTION_SETENV;
+ conn->setenv_state = SETENV_STATE_OPTION_SEND;
+ conn->next_eo = EnvironmentOptions;
+ return PGRES_POLLING_WRITING;
+ }
+
+ /* Otherwise, we are open for business! */
conn->status = CONNECTION_OK;
return PGRES_POLLING_OK;
}
+ case CONNECTION_SETENV:
+
+ /*
+ * Do post-connection housekeeping (only needed in protocol 2.0).
+ *
+ * We pretend that the connection is OK for the duration of
+ * these queries.
+ */
+ conn->status = CONNECTION_OK;
+
+ switch (pqSetenvPoll(conn))
+ {
+ case PGRES_POLLING_OK: /* Success */
+ break;
+
+ case PGRES_POLLING_READING: /* Still going */
+ conn->status = CONNECTION_SETENV;
+ return PGRES_POLLING_READING;
+
+ case PGRES_POLLING_WRITING: /* Still going */
+ conn->status = CONNECTION_SETENV;
+ return PGRES_POLLING_WRITING;
+
+ default:
+ goto error_return;
+ }
+
+ /* We are open for business! */
+ conn->status = CONNECTION_OK;
+ return PGRES_POLLING_OK;
+
default:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
* socket closed when PQfinish is called (which is compulsory even
* after an error, since the connection structure must be freed).
*/
+ conn->status = CONNECTION_BAD;
return PGRES_POLLING_FAILED;
}
conn->noticeHook = defaultNoticeProcessor;
conn->status = CONNECTION_BAD;
conn->asyncStatus = PGASYNC_IDLE;
+ conn->setenv_state = SETENV_STATE_IDLE;
+ conn->client_encoding = PG_SQL_ASCII;
conn->notifyList = DLNewList();
conn->sock = -1;
#ifdef USE_SSL
conn->nonblocking = FALSE;
initPQExpBuffer(&conn->errorMessage);
initPQExpBuffer(&conn->workBuffer);
+
if (conn->inBuffer == NULL ||
conn->outBuffer == NULL ||
conn->errorMessage.data == NULL ||
freePGconn(conn);
conn = NULL;
}
+
return conn;
}
free(conn->pgunixsocket);
if (conn->pgtty)
free(conn->pgtty);
+ if (conn->connect_timeout)
+ free(conn->connect_timeout);
if (conn->pgoptions)
free(conn->pgoptions);
if (conn->dbName)
free(conn->pguser);
if (conn->pgpass)
free(conn->pgpass);
- if (conn->connect_timeout)
- free(conn->connect_timeout);
/* Note that conn->Pfdebug is not ours to close or free */
if (conn->notifyList)
DLFreeList(conn->notifyList);
+ freeaddrinfo2(conn->addrlist);
if (conn->lobjfuncs)
free(conn->lobjfuncs);
if (conn->inBuffer)
* Try to send "close connection" message to backend. Ignore any
* error.
*/
- pqPutMsgStart('X', conn);
+ pqPutMsgStart('X', false, conn);
pqPutMsgEnd(conn);
pqFlush(conn);
}
conn->lobjfuncs = NULL;
conn->inStart = conn->inCursor = conn->inEnd = 0;
conn->outCount = 0;
- conn->nonblocking = FALSE;
-
}
/*
*
* RETURNS: STATUS_ERROR if the write fails, STATUS_OK otherwise.
* SIDE_EFFECTS: may block.
-*/
+ *
+ * Note: all messages sent with this routine have a length word, whether
+ * it's protocol 2.0 or 3.0.
+ */
int
pqPacketSend(PGconn *conn, char pack_type,
const void *buf, size_t buf_len)
{
/* Start the message. */
- if (pqPutMsgStart(pack_type, conn))
+ if (pqPutMsgStart(pack_type, true, conn))
return STATUS_ERROR;
/* Send the message body. */
/* note any error message is thrown away */
continue;
}
-
- /*
- * We used to special-case dbname too, but it's easier to let the
- * backend handle the fallback for that.
- */
}
return options;
}
-/*
- * Build a startup packet given a filled-in PGconn structure.
- *
- * We need to figure out how much space is needed, then fill it in.
- * To avoid duplicate logic, this routine is called twice: the first time
- * (with packet == NULL) just counts the space needed, the second time
- * (with packet == allocated space) fills it in. Return value is the number
- * of bytes used.
- */
-static int
-build_startup_packet(const PGconn *conn, char *packet)
-{
- int packet_len = 0;
- const struct EnvironmentOptions *next_eo;
-
- /* Protocol version comes first. */
- if (packet)
- {
- ProtocolVersion pv = htonl(PG_PROTOCOL_LIBPQ);
-
- memcpy(packet + packet_len, &pv, sizeof(ProtocolVersion));
- }
- packet_len += sizeof(ProtocolVersion);
-
- /* Add user name, database name, options */
- if (conn->pguser && conn->pguser[0])
- {
- if (packet)
- strcpy(packet + packet_len, "user");
- packet_len += strlen("user") + 1;
- if (packet)
- strcpy(packet + packet_len, conn->pguser);
- packet_len += strlen(conn->pguser) + 1;
- }
- if (conn->dbName && conn->dbName[0])
- {
- if (packet)
- strcpy(packet + packet_len, "database");
- packet_len += strlen("database") + 1;
- if (packet)
- strcpy(packet + packet_len, conn->dbName);
- packet_len += strlen(conn->dbName) + 1;
- }
- if (conn->pgoptions && conn->pgoptions[0])
- {
- if (packet)
- strcpy(packet + packet_len, "options");
- packet_len += strlen("options") + 1;
- if (packet)
- strcpy(packet + packet_len, conn->pgoptions);
- packet_len += strlen(conn->pgoptions) + 1;
- }
-
- /* Add any environment-driven GUC settings needed */
- for (next_eo = EnvironmentOptions; next_eo->envName; next_eo++)
- {
- const char *val;
-
- if ((val = getenv(next_eo->envName)) != NULL)
- {
- if (strcasecmp(val, "default") != 0)
- {
- if (packet)
- strcpy(packet + packet_len, next_eo->pgName);
- packet_len += strlen(next_eo->pgName) + 1;
- if (packet)
- strcpy(packet + packet_len, val);
- packet_len += strlen(val) + 1;
- }
- }
- }
-
- /* Add trailing terminator */
- if (packet)
- packet[packet_len] = '\0';
- packet_len++;
-
- return packet_len;
-}
-
-
/* =========== accessor functions for PGconn ========= */
char *
PQdb(const PGconn *conn)
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-exec.c,v 1.136 2003/05/26 20:05:20 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-exec.c,v 1.137 2003/06/08 17:43:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
};
-/* Note: DONOTICE macro will work if applied to either PGconn or PGresult */
-#define DONOTICE(conn,message) \
- ((*(conn)->noticeHook) ((conn)->noticeArg, (message)))
-
-static void pqCatenateResultError(PGresult *res, const char *msg);
-static void saveErrorResult(PGconn *conn);
-static PGresult *prepareAsyncResult(PGconn *conn);
-static int addTuple(PGresult *res, PGresAttValue * tup);
static void parseInput(PGconn *conn);
-static void handleSendFailure(PGconn *conn);
-static void handleSyncLoss(PGconn *conn, char id, int msgLength);
-static int getRowDescriptions(PGconn *conn);
-static int getAnotherTuple(PGconn *conn, int msgLength);
-static int getParameterStatus(PGconn *conn);
-static int getNotify(PGconn *conn);
/* ----------------
result = (PGresult *) malloc(sizeof(PGresult));
- result->xconn = conn; /* might be NULL */
result->ntups = 0;
result->numAttributes = 0;
result->attDescs = NULL;
* pqCatenateResultError -
* concatenate a new error message to the one already in a PGresult
*/
-static void
+void
pqCatenateResultError(PGresult *res, const char *msg)
{
PQExpBufferData errorBuf;
* and immediately closes the connection --- we want to report both the
* backend error and the connection closure error.)
*/
-static void
-saveErrorResult(PGconn *conn)
+void
+pqSaveErrorResult(PGconn *conn)
{
/*
* If no old async result, just let PQmakeEmptyPGresult make one.
* result storage and make sure PQerrorMessage will agree with the result's
* error string.
*/
-static PGresult *
-prepareAsyncResult(PGconn *conn)
+PGresult *
+pqPrepareAsyncResult(PGconn *conn)
{
PGresult *res;
}
/*
- * addTuple
+ * pqAddTuple
* add a row pointer to the PGresult structure, growing it if necessary
* Returns TRUE if OK, FALSE if not enough memory to add the row
*/
-static int
-addTuple(PGresult *res, PGresAttValue * tup)
+int
+pqAddTuple(PGresult *res, PGresAttValue *tup)
{
if (res->ntups >= res->tupArrSize)
{
/*
+ * pqSaveParameterStatus - remember parameter status sent by backend
+ */
+void
+pqSaveParameterStatus(PGconn *conn, const char *name, const char *value)
+{
+ pgParameterStatus *pstatus;
+ pgParameterStatus *prev;
+
+ if (conn->Pfdebug)
+ fprintf(conn->Pfdebug, "pqSaveParameterStatus: '%s' = '%s'\n",
+ name, value);
+
+ /*
+ * Forget any old information about the parameter
+ */
+ for (pstatus = conn->pstatus, prev = NULL;
+ pstatus != NULL;
+ prev = pstatus, pstatus = pstatus->next)
+ {
+ if (strcmp(pstatus->name, name) == 0)
+ {
+ if (prev)
+ prev->next = pstatus->next;
+ else
+ conn->pstatus = pstatus->next;
+ free(pstatus); /* frees name and value strings too */
+ break;
+ }
+ }
+ /*
+ * Store new info as a single malloc block
+ */
+ pstatus = (pgParameterStatus *) malloc(sizeof(pgParameterStatus) +
+ strlen(name) + strlen(value) + 2);
+ if (pstatus)
+ {
+ char *ptr;
+
+ ptr = ((char *) pstatus) + sizeof(pgParameterStatus);
+ pstatus->name = ptr;
+ strcpy(ptr, name);
+ ptr += strlen(name) + 1;
+ pstatus->value = ptr;
+ strcpy(ptr, value);
+ pstatus->next = conn->pstatus;
+ conn->pstatus = pstatus;
+ }
+ /*
+ * Special hacks: remember client_encoding as a numeric value, and
+ * remember at least the first few bytes of server version.
+ */
+ if (strcmp(name, "client_encoding") == 0)
+ conn->client_encoding = pg_char_to_encoding(value);
+ if (strcmp(name, "server_version") == 0)
+ StrNCpy(conn->sversion, value, sizeof(conn->sversion));
+}
+
+/*
+ * pqGetParameterStatus - fetch parameter value, if available
+ *
+ * Returns NULL if info not available
+ *
+ * XXX this probably should be exported for client use
+ */
+const char *
+pqGetParameterStatus(PGconn *conn, const char *name)
+{
+ pgParameterStatus *pstatus;
+
+ for (pstatus = conn->pstatus; pstatus != NULL; pstatus = pstatus->next)
+ {
+ if (strcmp(pstatus->name, name) == 0)
+ return pstatus->value;
+ }
+ return NULL;
+}
+
+
+/*
* PQsendQuery
* Submit a query, but don't wait for it to finish
*
conn->curTuple = NULL;
/* construct the outgoing Query message */
- if (pqPutMsgStart('Q', conn) < 0 ||
+ if (pqPutMsgStart('Q', false, conn) < 0 ||
pqPuts(query, conn) < 0 ||
pqPutMsgEnd(conn) < 0)
{
- handleSendFailure(conn);
+ pqHandleSendFailure(conn);
return 0;
}
*/
if (pqFlush(conn) < 0)
{
- handleSendFailure(conn);
+ pqHandleSendFailure(conn);
return 0;
}
}
/*
- * handleSendFailure: try to clean up after failure to send command.
+ * pqHandleSendFailure: try to clean up after failure to send command.
*
* Primarily, what we want to accomplish here is to process an async
* NOTICE message that the backend might have sent just before it died.
*
* NOTE: this routine should only be called in PGASYNC_IDLE state.
*/
-static void
-handleSendFailure(PGconn *conn)
+void
+pqHandleSendFailure(PGconn *conn)
{
/*
* Accept any available input data, ignoring errors. Note that if
* until input is exhausted or a stopping state is reached.
* Note that this function will NOT attempt to read more data from the backend.
*/
-
static void
parseInput(PGconn *conn)
{
- char id;
- int msgLength;
- int avail;
- char noticeWorkspace[128];
-
- /*
- * Loop to parse successive complete messages available in the buffer.
- */
- for (;;)
- {
- /*
- * Try to read a message. First get the type code and length.
- * Return if not enough data.
- */
- conn->inCursor = conn->inStart;
- if (pqGetc(&id, conn))
- return;
- if (pqGetInt(&msgLength, 4, conn))
- return;
-
- /*
- * Try to validate message type/length here. A length less than 4
- * is definitely broken. Large lengths should only be believed
- * for a few message types.
- */
- if (msgLength < 4)
- {
- handleSyncLoss(conn, id, msgLength);
- return;
- }
- if (msgLength > 30000 &&
- !(id == 'T' || id == 'D' || id == 'd'))
- {
- handleSyncLoss(conn, id, msgLength);
- return;
- }
-
- /*
- * Can't process if message body isn't all here yet.
- */
- msgLength -= 4;
- avail = conn->inEnd - conn->inCursor;
- if (avail < msgLength)
- {
- /*
- * Before returning, enlarge the input buffer if needed to hold
- * the whole message. This is better than leaving it to
- * pqReadData because we can avoid multiple cycles of realloc()
- * when the message is large; also, we can implement a reasonable
- * recovery strategy if we are unable to make the buffer big
- * enough.
- */
- if (pqCheckInBufferSpace(conn->inCursor + msgLength, conn))
- {
- /*
- * XXX add some better recovery code... plan is to skip
- * over the message using its length, then report an error.
- * For the moment, just treat this like loss of sync (which
- * indeed it might be!)
- */
- handleSyncLoss(conn, id, msgLength);
- }
- return;
- }
-
- /*
- * NOTIFY and NOTICE messages can happen in any state; always process
- * them right away.
- *
- * Most other messages should only be processed while in BUSY state.
- * (In particular, in READY state we hold off further parsing
- * until the application collects the current PGresult.)
- *
- * However, if the state is IDLE then we got trouble; we need to deal
- * with the unexpected message somehow.
- *
- * ParameterStatus ('S') messages are a special case: in IDLE state
- * we must process 'em (this case could happen if a new value was
- * adopted from config file due to SIGHUP), but otherwise we hold
- * off until BUSY state.
- */
- if (id == 'A')
- {
- if (getNotify(conn))
- return;
- }
- else if (id == 'N')
- {
- if (pqGetErrorNotice(conn, false))
- return;
- }
- else if (conn->asyncStatus != PGASYNC_BUSY)
- {
- /* If not IDLE state, just wait ... */
- if (conn->asyncStatus != PGASYNC_IDLE)
- return;
-
- /*
- * Unexpected message in IDLE state; need to recover somehow.
- * ERROR messages are displayed using the notice processor;
- * ParameterStatus is handled normally;
- * anything else is just dropped on the floor after displaying
- * a suitable warning notice. (An ERROR is very possibly the
- * backend telling us why it is about to close the connection,
- * so we don't want to just discard it...)
- */
- if (id == 'E')
- {
- if (pqGetErrorNotice(conn, false /* treat as notice */))
- return;
- }
- else if (id == 'S')
- {
- if (getParameterStatus(conn))
- return;
- }
- else
- {
- snprintf(noticeWorkspace, sizeof(noticeWorkspace),
- libpq_gettext("message type 0x%02x arrived from server while idle\n"),
- id);
- DONOTICE(conn, noticeWorkspace);
- /* Discard the unexpected message */
- conn->inCursor += msgLength;
- }
- }
- else
- {
- /*
- * In BUSY state, we can process everything.
- */
- switch (id)
- {
- case 'C': /* command complete */
- if (pqGets(&conn->workBuffer, conn))
- return;
- if (conn->result == NULL)
- conn->result = PQmakeEmptyPGresult(conn,
- PGRES_COMMAND_OK);
- strncpy(conn->result->cmdStatus, conn->workBuffer.data,
- CMDSTATUS_LEN);
- conn->asyncStatus = PGASYNC_READY;
- break;
- case 'E': /* error return */
- if (pqGetErrorNotice(conn, true))
- return;
- conn->asyncStatus = PGASYNC_READY;
- break;
- case 'Z': /* backend is ready for new query */
- if (pqGetc(&conn->xact_status, conn))
- return;
- conn->asyncStatus = PGASYNC_IDLE;
- break;
- case 'I': /* empty query */
- if (conn->result == NULL)
- conn->result = PQmakeEmptyPGresult(conn,
- PGRES_EMPTY_QUERY);
- conn->asyncStatus = PGASYNC_READY;
- break;
- case 'S': /* parameter status */
- if (getParameterStatus(conn))
- return;
- break;
- case 'K': /* secret key data from the backend */
-
- /*
- * This is expected only during backend startup, but
- * it's just as easy to handle it as part of the main
- * loop. Save the data and continue processing.
- */
- if (pqGetInt(&(conn->be_pid), 4, conn))
- return;
- if (pqGetInt(&(conn->be_key), 4, conn))
- return;
- break;
- case 'T': /* row descriptions (start of query
- * results) */
- if (conn->result == NULL)
- {
- /* First 'T' in a query sequence */
- if (getRowDescriptions(conn))
- return;
- }
- else
- {
- /*
- * A new 'T' message is treated as the start of
- * another PGresult. (It is not clear that this
- * is really possible with the current backend.)
- * We stop parsing until the application accepts
- * the current result.
- */
- conn->asyncStatus = PGASYNC_READY;
- return;
- }
- break;
- case 'D': /* Data Row */
- if (conn->result != NULL &&
- conn->result->resultStatus == PGRES_TUPLES_OK)
- {
- /* Read another tuple of a normal query response */
- if (getAnotherTuple(conn, msgLength))
- return;
- }
- else if (conn->result != NULL &&
- conn->result->resultStatus == PGRES_FATAL_ERROR)
- {
- /*
- * We've already choked for some reason. Just discard
- * tuples till we get to the end of the query.
- */
- conn->inCursor += msgLength;
- }
- else
- {
- /* Set up to report error at end of query */
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("server sent data (\"D\" message) without prior row description (\"T\" message)\n"));
- saveErrorResult(conn);
- /* Discard the unexpected message */
- conn->inCursor += msgLength;
- }
- break;
- case 'G': /* Start Copy In */
- if (pqGetc(&conn->copy_is_binary, conn))
- return;
- /* XXX we currently ignore the rest of the message */
- conn->inCursor = conn->inStart + 5 + msgLength;
- conn->asyncStatus = PGASYNC_COPY_IN;
- break;
- case 'H': /* Start Copy Out */
- if (pqGetc(&conn->copy_is_binary, conn))
- return;
- /* XXX we currently ignore the rest of the message */
- conn->inCursor = conn->inStart + 5 + msgLength;
- conn->asyncStatus = PGASYNC_COPY_OUT;
- conn->copy_already_done = 0;
- break;
- case 'd': /* Copy Data */
- /*
- * If we see Copy Data, just silently drop it. This
- * would only occur if application exits COPY OUT mode
- * too early.
- */
- conn->inCursor += msgLength;
- break;
- case 'c': /* Copy Done */
- /*
- * If we see Copy Done, just silently drop it. This
- * is the normal case during PQendcopy. We will keep
- * swallowing data, expecting to see command-complete
- * for the COPY command.
- */
- break;
- default:
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext(
- "unexpected response from server; first received character was \"%c\"\n"),
- id);
- /* build an error result holding the error message */
- saveErrorResult(conn);
- /* not sure if we will see more, so go to ready state */
- conn->asyncStatus = PGASYNC_READY;
- /* Discard the unexpected message */
- conn->inCursor += msgLength;
- break;
- } /* switch on protocol character */
- }
- /* Successfully consumed this message */
- if (conn->inCursor == conn->inStart + 5 + msgLength)
- {
- /* Normal case: parsing agrees with specified length */
- conn->inStart = conn->inCursor;
- }
- else
- {
- /* Trouble --- report it */
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("Message contents do not agree with length in message type \"%c\"\n"),
- id);
- /* build an error result holding the error message */
- saveErrorResult(conn);
- conn->asyncStatus = PGASYNC_READY;
- /* trust the specified message length as what to skip */
- conn->inStart += 5 + msgLength;
- }
- }
-}
-
-/*
- * handleSyncLoss: clean up after loss of message-boundary sync
- *
- * There isn't really a lot we can do here except abandon the connection.
- */
-static void
-handleSyncLoss(PGconn *conn, char id, int msgLength)
-{
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext(
- "lost synchronization with server: got message type \"%c\", length %d\n"),
- id, msgLength);
- conn->status = CONNECTION_BAD; /* No more connection to backend */
- pqsecure_close(conn);
- closesocket(conn->sock);
- conn->sock = -1;
- conn->asyncStatus = PGASYNC_READY; /* drop out of GetResult wait loop */
-}
-
-/*
- * parseInput subroutine to read a 'T' (row descriptions) message.
- * We build a PGresult structure containing the attribute data.
- * Returns: 0 if completed message, EOF if not enough data yet.
- *
- * Note that if we run out of data, we have to release the partially
- * constructed PGresult, and rebuild it again next time. Fortunately,
- * that shouldn't happen often, since 'T' messages usually fit in a packet.
- */
-
-static int
-getRowDescriptions(PGconn *conn)
-{
- PGresult *result;
- int nfields;
- int i;
-
- result = PQmakeEmptyPGresult(conn, PGRES_TUPLES_OK);
-
- /* parseInput already read the 'T' label and message length. */
- /* the next two bytes are the number of fields */
- if (pqGetInt(&(result->numAttributes), 2, conn))
- {
- PQclear(result);
- return EOF;
- }
- nfields = result->numAttributes;
-
- /* allocate space for the attribute descriptors */
- if (nfields > 0)
- {
- result->attDescs = (PGresAttDesc *)
- pqResultAlloc(result, nfields * sizeof(PGresAttDesc), TRUE);
- MemSet((char *) result->attDescs, 0, nfields * sizeof(PGresAttDesc));
- }
-
- /* get type info */
- for (i = 0; i < nfields; i++)
- {
- int tableid;
- int columnid;
- int typid;
- int typlen;
- int atttypmod;
- int format;
-
- if (pqGets(&conn->workBuffer, conn) ||
- pqGetInt(&tableid, 4, conn) ||
- pqGetInt(&columnid, 2, conn) ||
- pqGetInt(&typid, 4, conn) ||
- pqGetInt(&typlen, 2, conn) ||
- pqGetInt(&atttypmod, 4, conn) ||
- pqGetInt(&format, 2, conn))
- {
- PQclear(result);
- return EOF;
- }
-
- /*
- * Since pqGetInt treats 2-byte integers as unsigned, we need to
- * coerce these results to signed form.
- */
- columnid = (int) ((int16) columnid);
- typlen = (int) ((int16) typlen);
- format = (int) ((int16) format);
-
- result->attDescs[i].name = pqResultStrdup(result,
- conn->workBuffer.data);
- result->attDescs[i].typid = typid;
- result->attDescs[i].typlen = typlen;
- result->attDescs[i].atttypmod = atttypmod;
- /* XXX todo: save tableid/columnid, format too */
- }
-
- /* Success! */
- conn->result = result;
- return 0;
-}
-
-/*
- * parseInput subroutine to read a 'D' (row data) message.
- * We add another tuple to the existing PGresult structure.
- * Returns: 0 if completed message, EOF if error or not enough data yet.
- *
- * Note that if we run out of data, we have to suspend and reprocess
- * the message after more data is received. We keep a partially constructed
- * tuple in conn->curTuple, and avoid reallocating already-allocated storage.
- */
-
-static int
-getAnotherTuple(PGconn *conn, int msgLength)
-{
- PGresult *result = conn->result;
- int nfields = result->numAttributes;
- PGresAttValue *tup;
- int tupnfields; /* # fields from tuple */
- int vlen; /* length of the current field value */
- int i;
-
- /* Allocate tuple space if first time for this data message */
- if (conn->curTuple == NULL)
- {
- conn->curTuple = (PGresAttValue *)
- pqResultAlloc(result, nfields * sizeof(PGresAttValue), TRUE);
- if (conn->curTuple == NULL)
- goto outOfMemory;
- MemSet((char *) conn->curTuple, 0, nfields * sizeof(PGresAttValue));
- }
- tup = conn->curTuple;
-
- /* Get the field count and make sure it's what we expect */
- if (pqGetInt(&tupnfields, 2, conn))
- return EOF;
-
- if (tupnfields != nfields)
- {
- /* Replace partially constructed result with an error result */
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("unexpected field count in D message\n"));
- saveErrorResult(conn);
- /* Discard the failed message by pretending we read it */
- conn->inCursor = conn->inStart + 5 + msgLength;
- return 0;
- }
-
- /* Scan the fields */
- for (i = 0; i < nfields; i++)
- {
- /* get the value length */
- if (pqGetInt(&vlen, 4, conn))
- return EOF;
- if (vlen == -1)
- {
- /* null field */
- tup[i].value = result->null_field;
- tup[i].len = NULL_LEN;
- continue;
- }
- if (vlen < 0)
- vlen = 0;
- if (tup[i].value == NULL)
- {
- tup[i].value = (char *) pqResultAlloc(result, vlen + 1, false);
- if (tup[i].value == NULL)
- goto outOfMemory;
- }
- tup[i].len = vlen;
- /* read in the value */
- if (vlen > 0)
- if (pqGetnchar((char *) (tup[i].value), vlen, conn))
- return EOF;
- /* we have to terminate this ourselves */
- tup[i].value[vlen] = '\0';
- }
-
- /* Success! Store the completed tuple in the result */
- if (!addTuple(result, tup))
- goto outOfMemory;
- /* and reset for a new message */
- conn->curTuple = NULL;
-
- return 0;
-
-outOfMemory:
- /* Replace partially constructed result with an error result */
-
- /*
- * we do NOT use saveErrorResult() here, because of the likelihood
- * that there's not enough memory to concatenate messages. Instead,
- * discard the old result first to try to win back some memory.
- */
- pqClearAsyncResult(conn);
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("out of memory for query result\n"));
- conn->result = PQmakeEmptyPGresult(conn, PGRES_FATAL_ERROR);
- /* Discard the failed message by pretending we read it */
- conn->inCursor = conn->inStart + 5 + msgLength;
- return 0;
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ pqParseInput3(conn);
+ else
+ pqParseInput2(conn);
}
-
/*
* PQisBusy
* Return TRUE if PQgetResult would block waiting for input.
* conn->errorMessage has been set by pqWait or pqReadData. We
* want to append it to any already-received error message.
*/
- saveErrorResult(conn);
+ pqSaveErrorResult(conn);
conn->asyncStatus = PGASYNC_IDLE;
- return prepareAsyncResult(conn);
+ return pqPrepareAsyncResult(conn);
}
/* Parse it. */
parseInput(conn);
res = NULL; /* query is complete */
break;
case PGASYNC_READY:
- res = prepareAsyncResult(conn);
+ res = pqPrepareAsyncResult(conn);
/* Set the state back to BUSY, allowing parsing to proceed. */
conn->asyncStatus = PGASYNC_BUSY;
break;
return NULL;
}
-
-/*
- * Attempt to read an Error or Notice response message.
- * This is possible in several places, so we break it out as a subroutine.
- * Entry: 'E' or 'N' message type and length have already been consumed.
- * Exit: returns 0 if successfully consumed message.
- * returns EOF if not enough data.
- */
-int
-pqGetErrorNotice(PGconn *conn, bool isError)
-{
- PGresult *res;
- PQExpBufferData workBuf;
- char id;
-
- /*
- * Make a PGresult to hold the accumulated fields. We temporarily
- * lie about the result status, so that PQmakeEmptyPGresult doesn't
- * uselessly copy conn->errorMessage.
- */
- res = PQmakeEmptyPGresult(conn, PGRES_EMPTY_QUERY);
- res->resultStatus = PGRES_FATAL_ERROR;
- /*
- * Since the fields might be pretty long, we create a temporary
- * PQExpBuffer rather than using conn->workBuffer. workBuffer is
- * intended for stuff that is expected to be short. We shouldn't
- * use conn->errorMessage either, since this might be only a notice.
- */
- initPQExpBuffer(&workBuf);
-
- /*
- * Read the fields and save into res.
- */
- for (;;)
- {
- if (pqGetc(&id, conn))
- goto fail;
- if (id == '\0')
- break; /* terminator found */
- if (pqGets(&workBuf, conn))
- goto fail;
- switch (id)
- {
- case 'S':
- res->errSeverity = pqResultStrdup(res, workBuf.data);
- break;
- case 'C':
- res->errCode = pqResultStrdup(res, workBuf.data);
- break;
- case 'M':
- res->errPrimary = pqResultStrdup(res, workBuf.data);
- break;
- case 'D':
- res->errDetail = pqResultStrdup(res, workBuf.data);
- break;
- case 'H':
- res->errHint = pqResultStrdup(res, workBuf.data);
- break;
- case 'P':
- res->errPosition = pqResultStrdup(res, workBuf.data);
- break;
- case 'W':
- res->errContext = pqResultStrdup(res, workBuf.data);
- break;
- case 'F':
- res->errFilename = pqResultStrdup(res, workBuf.data);
- break;
- case 'L':
- res->errLineno = pqResultStrdup(res, workBuf.data);
- break;
- case 'R':
- res->errFuncname = pqResultStrdup(res, workBuf.data);
- break;
- default:
- /* silently ignore any other field type */
- break;
- }
- }
-
- /*
- * Now build the "overall" error message for PQresultErrorMessage.
- *
- * XXX this should be configurable somehow.
- */
- resetPQExpBuffer(&workBuf);
- if (res->errSeverity)
- appendPQExpBuffer(&workBuf, "%s: ", res->errSeverity);
- if (res->errPrimary)
- appendPQExpBufferStr(&workBuf, res->errPrimary);
- /* translator: %s represents a digit string */
- if (res->errPosition)
- appendPQExpBuffer(&workBuf, libpq_gettext(" at character %s"),
- res->errPosition);
- appendPQExpBufferChar(&workBuf, '\n');
- if (res->errDetail)
- appendPQExpBuffer(&workBuf, libpq_gettext("DETAIL: %s\n"),
- res->errDetail);
- if (res->errHint)
- appendPQExpBuffer(&workBuf, libpq_gettext("HINT: %s\n"),
- res->errHint);
- if (res->errContext)
- appendPQExpBuffer(&workBuf, libpq_gettext("CONTEXT: %s\n"),
- res->errContext);
-
- /*
- * Either save error as current async result, or just emit the notice.
- */
- if (isError)
- {
- res->errMsg = pqResultStrdup(res, workBuf.data);
- pqClearAsyncResult(conn);
- conn->result = res;
- resetPQExpBuffer(&conn->errorMessage);
- appendPQExpBufferStr(&conn->errorMessage, workBuf.data);
- }
- else
- {
- DONOTICE(conn, workBuf.data);
- PQclear(res);
- }
-
- termPQExpBuffer(&workBuf);
- return 0;
-
-fail:
- PQclear(res);
- termPQExpBuffer(&workBuf);
- return EOF;
-}
-
-/*
- * Attempt to read a ParameterStatus message.
- * This is possible in several places, so we break it out as a subroutine.
- * Entry: 'S' message type and length have already been consumed.
- * Exit: returns 0 if successfully consumed message.
- * returns EOF if not enough data.
- */
-static int
-getParameterStatus(PGconn *conn)
-{
- /* Get the parameter name */
- if (pqGets(&conn->workBuffer, conn))
- return EOF;
- /* Is it one we care about? */
- if (strcmp(conn->workBuffer.data, "client_encoding") == 0)
- {
- if (pqGets(&conn->workBuffer, conn))
- return EOF;
- conn->client_encoding = pg_char_to_encoding(conn->workBuffer.data);
- }
- else
- {
- /* Uninteresting parameter, ignore it */
- if (pqGets(&conn->workBuffer, conn))
- return EOF;
- }
- return 0;
-}
-
-/*
- * Attempt to read a Notify response message.
- * This is possible in several places, so we break it out as a subroutine.
- * Entry: 'A' message type and length have already been consumed.
- * Exit: returns 0 if successfully consumed Notify message.
- * returns EOF if not enough data.
- */
-static int
-getNotify(PGconn *conn)
-{
- int be_pid;
- PGnotify *newNotify;
-
- if (pqGetInt(&be_pid, 4, conn))
- return EOF;
- if (pqGets(&conn->workBuffer, conn))
- return EOF;
-
- /*
- * Store the relation name right after the PQnotify structure so it
- * can all be freed at once. We don't use NAMEDATALEN because we
- * don't want to tie this interface to a specific server name length.
- */
- newNotify = (PGnotify *) malloc(sizeof(PGnotify) +
- strlen(conn->workBuffer.data) +1);
- if (newNotify)
- {
- newNotify->relname = (char *) newNotify + sizeof(PGnotify);
- strcpy(newNotify->relname, conn->workBuffer.data);
- newNotify->be_pid = be_pid;
- DLAddTail(conn->notifyList, DLNewElem(newNotify));
- }
-
- /* Swallow extra string (not presently used) */
- if (pqGets(&conn->workBuffer, conn))
- return EOF;
-
- return 0;
-}
-
/*
* PQnotifies
* returns a PGnotify* structure of the latest async notification
int
PQgetline(PGconn *conn, char *s, int maxlen)
{
- int status;
-
+ if (!s || maxlen <= 0)
+ return EOF;
+ *s = '\0';
/* maxlen must be at least 3 to hold the \. terminator! */
- if (!conn || !s || maxlen < 3)
+ if (maxlen < 3)
return EOF;
- if (conn->sock < 0 ||
- conn->asyncStatus != PGASYNC_COPY_OUT ||
- conn->copy_is_binary)
- {
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("PQgetline: not doing text COPY OUT\n"));
- *s = '\0';
+ if (!conn)
return EOF;
- }
-
- while ((status = PQgetlineAsync(conn, s, maxlen-1)) == 0)
- {
- /* need to load more data */
- if (pqWait(TRUE, FALSE, conn) ||
- pqReadData(conn) < 0)
- {
- *s = '\0';
- return EOF;
- }
- }
- if (status < 0)
- {
- /* End of copy detected; gin up old-style terminator */
- strcpy(s, "\\.");
- return 0;
- }
-
- /* Add null terminator, and strip trailing \n if present */
- if (s[status-1] == '\n')
- {
- s[status-1] = '\0';
- return 0;
- }
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ return pqGetline3(conn, s, maxlen);
else
- {
- s[status] = '\0';
- return 1;
- }
+ return pqGetline2(conn, s, maxlen);
}
/*
int
PQgetlineAsync(PGconn *conn, char *buffer, int bufsize)
{
- char id;
- int msgLength;
- int avail;
-
- if (!conn || conn->asyncStatus != PGASYNC_COPY_OUT)
- return -1; /* we are not doing a copy... */
-
- /*
- * Recognize the next input message. To make life simpler for async
- * callers, we keep returning 0 until the next message is fully available
- * even if it is not Copy Data. This should keep PQendcopy from blocking.
- */
- conn->inCursor = conn->inStart;
- if (pqGetc(&id, conn))
- return 0;
- if (pqGetInt(&msgLength, 4, conn))
- return 0;
- avail = conn->inEnd - conn->inCursor;
- if (avail < msgLength - 4)
- return 0;
-
- /*
- * Cannot proceed unless it's a Copy Data message. Anything else means
- * end of copy mode.
- */
- if (id != 'd')
+ if (!conn)
return -1;
- /*
- * Move data from libpq's buffer to the caller's. In the case where
- * a prior call found the caller's buffer too small, we use
- * conn->copy_already_done to remember how much of the row was already
- * returned to the caller.
- */
- conn->inCursor += conn->copy_already_done;
- avail = msgLength - 4 - conn->copy_already_done;
- if (avail <= bufsize)
- {
- /* Able to consume the whole message */
- memcpy(buffer, &conn->inBuffer[conn->inCursor], avail);
- /* Mark message consumed */
- conn->inStart = conn->inCursor + avail;
- /* Reset state for next time */
- conn->copy_already_done = 0;
- return avail;
- }
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ return pqGetlineAsync3(conn, buffer, bufsize);
else
- {
- /* We must return a partial message */
- memcpy(buffer, &conn->inBuffer[conn->inCursor], bufsize);
- /* The message is NOT consumed from libpq's buffer */
- conn->copy_already_done += bufsize;
- return bufsize;
- }
+ return pqGetlineAsync2(conn, buffer, bufsize);
}
/*
return EOF;
if (nbytes > 0)
{
- if (pqPutMsgStart('d', conn) < 0 ||
- pqPutnchar(buffer, nbytes, conn) < 0 ||
- pqPutMsgEnd(conn) < 0)
- return EOF;
+ /* This is too simple to bother with separate subroutines */
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ {
+ if (pqPutMsgStart('d', false, conn) < 0 ||
+ pqPutnchar(buffer, nbytes, conn) < 0 ||
+ pqPutMsgEnd(conn) < 0)
+ return EOF;
+ }
+ else
+ {
+ if (pqPutMsgStart(0, false, conn) < 0 ||
+ pqPutnchar(buffer, nbytes, conn) < 0 ||
+ pqPutMsgEnd(conn) < 0)
+ return EOF;
+ }
}
return 0;
}
int
PQendcopy(PGconn *conn)
{
- PGresult *result;
-
if (!conn)
return 0;
- if (conn->asyncStatus != PGASYNC_COPY_IN &&
- conn->asyncStatus != PGASYNC_COPY_OUT)
- {
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("no COPY in progress\n"));
- return 1;
- }
-
- /* Send the CopyDone message if needed */
- if (conn->asyncStatus == PGASYNC_COPY_IN)
- {
- if (pqPutMsgStart('c', conn) < 0 ||
- pqPutMsgEnd(conn) < 0)
- return 1;
- }
-
- /*
- * make sure no data is waiting to be sent, abort if we are
- * non-blocking and the flush fails
- */
- if (pqFlush(conn) && pqIsnonblocking(conn))
- return (1);
-
- /* Return to active duty */
- conn->asyncStatus = PGASYNC_BUSY;
- resetPQExpBuffer(&conn->errorMessage);
-
- /*
- * Non blocking connections may have to abort at this point. If everyone
- * played the game there should be no problem, but in error scenarios
- * the expected messages may not have arrived yet. (We are assuming that
- * the backend's packetizing will ensure that CommandComplete arrives
- * along with the CopyDone; are there corner cases where that doesn't
- * happen?)
- */
- if (pqIsnonblocking(conn) && PQisBusy(conn))
- return (1);
-
- /* Wait for the completion response */
- result = PQgetResult(conn);
-
- /* Expecting a successful result */
- if (result && result->resultStatus == PGRES_COMMAND_OK)
- {
- PQclear(result);
- return 0;
- }
-
- /*
- * Trouble. For backwards-compatibility reasons, we issue the error
- * message as if it were a notice (would be nice to get rid of this
- * silliness, but too many apps probably don't handle errors from
- * PQendcopy reasonably). Note that the app can still obtain the
- * error status from the PGconn object.
- */
- if (conn->errorMessage.len > 0)
- DONOTICE(conn, conn->errorMessage.data);
-
- PQclear(result);
-
- return 1;
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ return pqEndcopy3(conn);
+ else
+ return pqEndcopy2(conn);
}
const PQArgBlock *args,
int nargs)
{
- bool needInput = false;
- ExecStatusType status = PGRES_FATAL_ERROR;
- char id;
- int msgLength;
- int avail;
- int i;
-
*actual_result_len = 0;
if (!conn)
return NULL;
}
- if (pqPutMsgStart('F', conn) < 0 || /* function call msg */
- pqPutInt(fnid, 4, conn) < 0 || /* function id */
- pqPutInt(1, 2, conn) < 0 || /* # of format codes */
- pqPutInt(1, 2, conn) < 0 || /* format code: BINARY */
- pqPutInt(nargs, 2, conn) < 0) /* # of args */
- {
- handleSendFailure(conn);
- return NULL;
- }
-
- for (i = 0; i < nargs; ++i)
- { /* len.int4 + contents */
- if (pqPutInt(args[i].len, 4, conn))
- {
- handleSendFailure(conn);
- return NULL;
- }
- if (args[i].len == -1)
- continue; /* it's NULL */
-
- if (args[i].isint)
- {
- if (pqPutInt(args[i].u.integer, args[i].len, conn))
- {
- handleSendFailure(conn);
- return NULL;
- }
- }
- else
- {
- if (pqPutnchar((char *) args[i].u.ptr, args[i].len, conn))
- {
- handleSendFailure(conn);
- return NULL;
- }
- }
- }
-
- if (pqPutInt(1, 2, conn) < 0) /* result format code: BINARY */
- {
- handleSendFailure(conn);
- return NULL;
- }
-
- if (pqPutMsgEnd(conn) < 0 ||
- pqFlush(conn))
- {
- handleSendFailure(conn);
- return NULL;
- }
-
- for (;;)
- {
- if (needInput)
- {
- /* Wait for some data to arrive (or for the channel to close) */
- if (pqWait(TRUE, FALSE, conn) ||
- pqReadData(conn) < 0)
- break;
- }
-
- /*
- * Scan the message. If we run out of data, loop around to try
- * again.
- */
- needInput = true;
-
- conn->inCursor = conn->inStart;
- if (pqGetc(&id, conn))
- continue;
- if (pqGetInt(&msgLength, 4, conn))
- continue;
-
- /*
- * Try to validate message type/length here. A length less than 4
- * is definitely broken. Large lengths should only be believed
- * for a few message types.
- */
- if (msgLength < 4)
- {
- handleSyncLoss(conn, id, msgLength);
- break;
- }
- if (msgLength > 30000 &&
- !(id == 'T' || id == 'D' || id == 'd' || id == 'V'))
- {
- handleSyncLoss(conn, id, msgLength);
- break;
- }
-
- /*
- * Can't process if message body isn't all here yet.
- */
- msgLength -= 4;
- avail = conn->inEnd - conn->inCursor;
- if (avail < msgLength)
- {
- /*
- * Before looping, enlarge the input buffer if needed to hold
- * the whole message. See notes in parseInput.
- */
- if (pqCheckInBufferSpace(conn->inCursor + msgLength, conn))
- {
- /*
- * XXX add some better recovery code... plan is to skip
- * over the message using its length, then report an error.
- * For the moment, just treat this like loss of sync (which
- * indeed it might be!)
- */
- handleSyncLoss(conn, id, msgLength);
- break;
- }
- continue;
- }
-
- /*
- * We should see V or E response to the command, but might get N
- * and/or A notices first. We also need to swallow the final Z
- * before returning.
- */
- switch (id)
- {
- case 'V': /* function result */
- if (pqGetInt(actual_result_len, 4, conn))
- continue;
- if (*actual_result_len != -1)
- {
- if (result_is_int)
- {
- if (pqGetInt(result_buf, *actual_result_len, conn))
- continue;
- }
- else
- {
- if (pqGetnchar((char *) result_buf,
- *actual_result_len,
- conn))
- continue;
- }
- }
- /* correctly finished function result message */
- status = PGRES_COMMAND_OK;
- break;
- case 'E': /* error return */
- if (pqGetErrorNotice(conn, true))
- continue;
- status = PGRES_FATAL_ERROR;
- break;
- case 'A': /* notify message */
- /* handle notify and go back to processing return values */
- if (getNotify(conn))
- continue;
- break;
- case 'N': /* notice */
- /* handle notice and go back to processing return values */
- if (pqGetErrorNotice(conn, false))
- continue;
- break;
- case 'Z': /* backend is ready for new query */
- if (pqGetc(&conn->xact_status, conn))
- continue;
- /* consume the message and exit */
- conn->inStart += 5 + msgLength;
- /* if we saved a result object (probably an error), use it */
- if (conn->result)
- return prepareAsyncResult(conn);
- return PQmakeEmptyPGresult(conn, status);
- case 'S': /* parameter status */
- if (getParameterStatus(conn))
- continue;
- break;
- default:
- /* The backend violates the protocol. */
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("protocol error: id=0x%x\n"),
- id);
- saveErrorResult(conn);
- /* trust the specified message length as what to skip */
- conn->inStart += 5 + msgLength;
- return prepareAsyncResult(conn);
- }
- /* Completed this message, keep going */
- /* trust the specified message length as what to skip */
- conn->inStart += 5 + msgLength;
- needInput = false;
- }
-
- /*
- * We fall out of the loop only upon failing to read data.
- * conn->errorMessage has been set by pqWait or pqReadData. We want to
- * append it to any already-received error message.
- */
- saveErrorResult(conn);
- return prepareAsyncResult(conn);
+ if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ return pqFunctionCall3(conn, fnid,
+ result_buf, actual_result_len,
+ result_is_int,
+ args, nargs);
+ else
+ return pqFunctionCall2(conn, fnid,
+ result_buf, actual_result_len,
+ result_is_int,
+ args, nargs);
}
snprintf(noticeBuf, sizeof(noticeBuf),
libpq_gettext("column number %d is out of range 0..%d\n"),
field_num, res->numAttributes - 1);
- DONOTICE(res, noticeBuf);
+ PGDONOTICE(res, noticeBuf);
}
return FALSE;
}
snprintf(noticeBuf, sizeof(noticeBuf),
libpq_gettext("row number %d is out of range 0..%d\n"),
tup_num, res->ntups - 1);
- DONOTICE(res, noticeBuf);
+ PGDONOTICE(res, noticeBuf);
}
return FALSE;
}
snprintf(noticeBuf, sizeof(noticeBuf),
libpq_gettext("column number %d is out of range 0..%d\n"),
field_num, res->numAttributes - 1);
- DONOTICE(res, noticeBuf);
+ PGDONOTICE(res, noticeBuf);
}
return FALSE;
}
snprintf(noticeBuf, sizeof(noticeBuf),
libpq_gettext("could not interpret result from server: %s\n"),
res->cmdStatus);
- DONOTICE(res, noticeBuf);
+ PGDONOTICE(res, noticeBuf);
}
return "";
}
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.91 2003/04/25 01:24:00 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.92 2003/06/08 17:43:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "pqsignal.h"
#include "mb/pg_wchar.h"
-#define DONOTICE(conn,message) \
- ((*(conn)->noticeHook) ((conn)->noticeArg, (message)))
static int pqPutMsgBytes(const void *buf, size_t len, PGconn *conn);
static int pqSendSome(PGconn *conn, int len);
snprintf(noticeBuf, sizeof(noticeBuf),
libpq_gettext("integer of size %lu not supported by pqGetInt\n"),
(unsigned long) bytes);
- DONOTICE(conn, noticeBuf);
+ PGDONOTICE(conn, noticeBuf);
return EOF;
}
snprintf(noticeBuf, sizeof(noticeBuf),
libpq_gettext("integer of size %lu not supported by pqPutInt\n"),
(unsigned long) bytes);
- DONOTICE(conn, noticeBuf);
+ PGDONOTICE(conn, noticeBuf);
return EOF;
}
* msg_type is the message type byte, or 0 for a message without type byte
* (only startup messages have no type byte)
*
+ * force_len forces the message to have a length word; otherwise, we add
+ * a length word if protocol 3.
+ *
* Returns 0 on success, EOF on error
*
* The idea here is that we construct the message in conn->outBuffer,
* beginning just past any data already in outBuffer (ie, at
* outBuffer+outCount). We enlarge the buffer as needed to hold the message.
- * When the message is complete, we fill in the length word and then advance
- * outCount past the message, making it eligible to send. The state
- * variable conn->outMsgStart points to the incomplete message's length word
- * (it is either outCount or outCount+1 depending on whether there is a
- * type byte). The state variable conn->outMsgEnd is the end of the data
- * collected so far.
+ * When the message is complete, we fill in the length word (if needed) and
+ * then advance outCount past the message, making it eligible to send.
+ *
+ * The state variable conn->outMsgStart points to the incomplete message's
+ * length word: it is either outCount or outCount+1 depending on whether
+ * there is a type byte. If we are sending a message without length word
+ * (pre protocol 3.0 only), then outMsgStart is -1. The state variable
+ * conn->outMsgEnd is the end of the data collected so far.
*/
int
-pqPutMsgStart(char msg_type, PGconn *conn)
+pqPutMsgStart(char msg_type, bool force_len, PGconn *conn)
{
int lenPos;
+ int endPos;
- /* where the message length word will go */
+ /* allow room for message type byte */
if (msg_type)
- lenPos = conn->outCount + 1;
+ endPos = conn->outCount + 1;
else
- lenPos = conn->outCount;
- /* make sure there is room for it */
- if (pqCheckOutBufferSpace(lenPos + 4, conn))
+ endPos = conn->outCount;
+
+ /* do we want a length word? */
+ if (force_len || PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
+ {
+ lenPos = endPos;
+ /* allow room for message length */
+ endPos += 4;
+ }
+ else
+ {
+ lenPos = -1;
+ }
+
+ /* make sure there is room for message header */
+ if (pqCheckOutBufferSpace(endPos, conn))
return EOF;
/* okay, save the message type byte if any */
if (msg_type)
conn->outBuffer[conn->outCount] = msg_type;
/* set up the message pointers */
conn->outMsgStart = lenPos;
- conn->outMsgEnd = lenPos + 4;
- /* length word will be filled in by pqPutMsgEnd */
+ conn->outMsgEnd = endPos;
+ /* length word, if needed, will be filled in by pqPutMsgEnd */
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "To backend> Msg %c\n",
int
pqPutMsgEnd(PGconn *conn)
{
- uint32 msgLen = conn->outMsgEnd - conn->outMsgStart;
-
if (conn->Pfdebug)
fprintf(conn->Pfdebug, "To backend> Msg complete, length %u\n",
- msgLen);
+ conn->outMsgEnd - conn->outCount);
+
+ /* Fill in length word if needed */
+ if (conn->outMsgStart >= 0)
+ {
+ uint32 msgLen = conn->outMsgEnd - conn->outMsgStart;
+
+ msgLen = htonl(msgLen);
+ memcpy(conn->outBuffer + conn->outMsgStart, &msgLen, 4);
+ }
- msgLen = htonl(msgLen);
- memcpy(conn->outBuffer + conn->outMsgStart, &msgLen, 4);
+ /* Make message eligible to send */
conn->outCount = conn->outMsgEnd;
if (conn->outCount >= 8192)
--- /dev/null
+/*-------------------------------------------------------------------------
+ *
+ * fe-protocol2.c
+ * functions that are specific to frontend/backend protocol version 2
+ *
+ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-protocol2.c,v 1.1 2003/06/08 17:43:00 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres_fe.h"
+
+#include <errno.h>
+#include <ctype.h>
+#include <fcntl.h>
+
+#include "libpq-fe.h"
+#include "libpq-int.h"
+
+#include "mb/pg_wchar.h"
+
+#ifdef WIN32
+#include "win32.h"
+#else
+#include <unistd.h>
+#include <netinet/in.h>
+#ifdef HAVE_NETINET_TCP_H
+#include <netinet/tcp.h>
+#endif
+#include <arpa/inet.h>
+#endif
+
+
+static int getRowDescriptions(PGconn *conn);
+static int getAnotherTuple(PGconn *conn, bool binary);
+static int pqGetErrorNotice2(PGconn *conn, bool isError);
+static int getNotify(PGconn *conn);
+
+
+/*
+ * pqSetenvPoll
+ *
+ * Polls the process of passing the values of a standard set of environment
+ * variables to the backend.
+ */
+PostgresPollingStatusType
+pqSetenvPoll(PGconn *conn)
+{
+ PGresult *res;
+
+ if (conn == NULL || conn->status == CONNECTION_BAD)
+ return PGRES_POLLING_FAILED;
+
+ /* Check whether there are any data for us */
+ switch (conn->setenv_state)
+ {
+ /* These are reading states */
+ case SETENV_STATE_OPTION_WAIT:
+ case SETENV_STATE_QUERY1_WAIT:
+ case SETENV_STATE_QUERY2_WAIT:
+ {
+ /* Load waiting data */
+ int n = pqReadData(conn);
+
+ if (n < 0)
+ goto error_return;
+ if (n == 0)
+ return PGRES_POLLING_READING;
+
+ break;
+ }
+
+ /* These are writing states, so we just proceed. */
+ case SETENV_STATE_OPTION_SEND:
+ case SETENV_STATE_QUERY1_SEND:
+ case SETENV_STATE_QUERY2_SEND:
+ break;
+
+ /* Should we raise an error if called when not active? */
+ case SETENV_STATE_IDLE:
+ return PGRES_POLLING_OK;
+
+ default:
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext(
+ "invalid setenv state %c, "
+ "probably indicative of memory corruption\n"
+ ),
+ conn->setenv_state);
+ goto error_return;
+ }
+
+ /* We will loop here until there is nothing left to do in this call. */
+ for (;;)
+ {
+ switch (conn->setenv_state)
+ {
+ case SETENV_STATE_OPTION_SEND:
+ {
+ /*
+ * Send SET commands for stuff directed by Environment
+ * Options. Note: we assume that SET commands won't
+ * start transaction blocks, even in a 7.3 server with
+ * autocommit off.
+ */
+ char setQuery[100]; /* note length limit in
+ * sprintf below */
+
+ if (conn->next_eo->envName)
+ {
+ const char *val;
+
+ if ((val = getenv(conn->next_eo->envName)))
+ {
+ if (strcasecmp(val, "default") == 0)
+ sprintf(setQuery, "SET %s = DEFAULT",
+ conn->next_eo->pgName);
+ else
+ sprintf(setQuery, "SET %s = '%.60s'",
+ conn->next_eo->pgName, val);
+#ifdef CONNECTDEBUG
+ fprintf(stderr,
+ "Use environment variable %s to send %s\n",
+ conn->next_eo->envName, setQuery);
+#endif
+ if (!PQsendQuery(conn, setQuery))
+ goto error_return;
+
+ conn->setenv_state = SETENV_STATE_OPTION_WAIT;
+ }
+ else
+ conn->next_eo++;
+ }
+ else
+ {
+ /* No more options to send, so move on to querying */
+ conn->setenv_state = SETENV_STATE_QUERY1_SEND;
+ }
+ break;
+ }
+
+ case SETENV_STATE_OPTION_WAIT:
+ {
+ if (PQisBusy(conn))
+ return PGRES_POLLING_READING;
+
+ res = PQgetResult(conn);
+
+ if (res)
+ {
+ if (PQresultStatus(res) != PGRES_COMMAND_OK)
+ {
+ PQclear(res);
+ goto error_return;
+ }
+ PQclear(res);
+ /* Keep reading until PQgetResult returns NULL */
+ }
+ else
+ {
+ /* Query finished, so send the next option */
+ conn->next_eo++;
+ conn->setenv_state = SETENV_STATE_OPTION_SEND;
+ }
+ break;
+ }
+
+ case SETENV_STATE_QUERY1_SEND:
+ {
+ /*
+ * Issue query to get information we need. Here we must
+ * use begin/commit in case autocommit is off by default
+ * in a 7.3 server.
+ *
+ * Note: version() and getdatabaseencoding() exist in
+ * all protocol-2.0-supporting backends.
+ */
+ if (!PQsendQuery(conn, "begin; select version(), getdatabaseencoding(); end"))
+ goto error_return;
+
+ conn->setenv_state = SETENV_STATE_QUERY1_WAIT;
+ return PGRES_POLLING_READING;
+ }
+
+ case SETENV_STATE_QUERY1_WAIT:
+ {
+ if (PQisBusy(conn))
+ return PGRES_POLLING_READING;
+
+ res = PQgetResult(conn);
+
+ if (res)
+ {
+ char *val;
+
+ if (PQresultStatus(res) == PGRES_COMMAND_OK)
+ {
+ /* ignore begin/commit command results */
+ PQclear(res);
+ continue;
+ }
+
+ if (PQresultStatus(res) != PGRES_TUPLES_OK ||
+ PQntuples(res) != 1)
+ {
+ PQclear(res);
+ goto error_return;
+ }
+
+ /*
+ * Extract server version and database encoding,
+ * and save as if ParameterStatus
+ */
+ val = PQgetvalue(res, 0, 0);
+ if (val && strncmp(val, "PostgreSQL ", 11) == 0)
+ {
+ char *ptr;
+
+ /* strip off PostgreSQL part */
+ val += 11;
+ /*
+ * strip off platform part (scribbles on result,
+ * naughty naughty)
+ */
+ ptr = strchr(val, ' ');
+ if (ptr)
+ *ptr = '\0';
+
+ pqSaveParameterStatus(conn, "server_version",
+ val);
+ }
+
+ val = PQgetvalue(res, 0, 1);
+ if (val && *val) /* null should not happen, but */
+ pqSaveParameterStatus(conn, "server_encoding",
+ val);
+
+ PQclear(res);
+ /* Keep reading until PQgetResult returns NULL */
+ }
+ else
+ {
+ /* Query finished, move to next */
+ conn->setenv_state = SETENV_STATE_QUERY2_SEND;
+ }
+ break;
+ }
+
+ case SETENV_STATE_QUERY2_SEND:
+ {
+ const char *query;
+
+ /*
+ * pg_client_encoding does not exist in pre-7.2 servers.
+ * So we need to be prepared for an error here. Do *not*
+ * start a transaction block, except in 7.3 servers where
+ * we need to prevent autocommit-off from starting a
+ * transaction anyway.
+ */
+ if (strncmp(conn->sversion, "7.3", 3) == 0)
+ query = "begin; select pg_client_encoding(); end";
+ else
+ query = "select pg_client_encoding()";
+ if (!PQsendQuery(conn, query))
+ goto error_return;
+
+ conn->setenv_state = SETENV_STATE_QUERY2_WAIT;
+ return PGRES_POLLING_READING;
+ }
+
+ case SETENV_STATE_QUERY2_WAIT:
+ {
+ if (PQisBusy(conn))
+ return PGRES_POLLING_READING;
+
+ res = PQgetResult(conn);
+
+ if (res)
+ {
+ const char *val;
+
+ if (PQresultStatus(res) == PGRES_COMMAND_OK)
+ {
+ /* ignore begin/commit command results */
+ PQclear(res);
+ continue;
+ }
+
+ if (PQresultStatus(res) == PGRES_TUPLES_OK &&
+ PQntuples(res) == 1)
+ {
+ /* Extract client encoding and save it */
+ val = PQgetvalue(res, 0, 0);
+ if (val && *val) /* null should not happen, but */
+ pqSaveParameterStatus(conn, "client_encoding",
+ val);
+ }
+ else
+ {
+ /*
+ * Error: presumably function not available, so
+ * use PGCLIENTENCODING or database encoding as
+ * the fallback.
+ */
+ val = getenv("PGCLIENTENCODING");
+ if (val && *val)
+ pqSaveParameterStatus(conn, "client_encoding",
+ val);
+ else
+ {
+ val = pqGetParameterStatus(conn, "server_encoding");
+ if (val && *val)
+ pqSaveParameterStatus(conn, "client_encoding",
+ val);
+ }
+ }
+
+ PQclear(res);
+ /* Keep reading until PQgetResult returns NULL */
+ }
+ else
+ {
+ /* Query finished, so we're done */
+ conn->setenv_state = SETENV_STATE_IDLE;
+ return PGRES_POLLING_OK;
+ }
+ break;
+ }
+
+ default:
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("invalid state %c, "
+ "probably indicative of memory corruption\n"),
+ conn->setenv_state);
+ goto error_return;
+ }
+ }
+
+ /* Unreachable */
+
+error_return:
+ conn->setenv_state = SETENV_STATE_IDLE;
+ return PGRES_POLLING_FAILED;
+}
+
+
+/*
+ * parseInput: if appropriate, parse input data from backend
+ * until input is exhausted or a stopping state is reached.
+ * Note that this function will NOT attempt to read more data from the backend.
+ */
+void
+pqParseInput2(PGconn *conn)
+{
+ char id;
+ char noticeWorkspace[128];
+
+ /*
+ * Loop to parse successive complete messages available in the buffer.
+ */
+ for (;;)
+ {
+ /*
+ * Quit if in COPY_OUT state: we expect raw data from the server
+ * until PQendcopy is called. Don't try to parse it according to
+ * the normal protocol. (This is bogus. The data lines ought to
+ * be part of the protocol and have identifying leading
+ * characters.)
+ */
+ if (conn->asyncStatus == PGASYNC_COPY_OUT)
+ return;
+
+ /*
+ * OK to try to read a message type code.
+ */
+ conn->inCursor = conn->inStart;
+ if (pqGetc(&id, conn))
+ return;
+
+ /*
+ * NOTIFY and NOTICE messages can happen in any state besides
+ * COPY OUT; always process them right away.
+ *
+ * Most other messages should only be processed while in BUSY state.
+ * (In particular, in READY state we hold off further parsing
+ * until the application collects the current PGresult.)
+ *
+ * However, if the state is IDLE then we got trouble; we need to deal
+ * with the unexpected message somehow.
+ */
+ if (id == 'A')
+ {
+ if (getNotify(conn))
+ return;
+ }
+ else if (id == 'N')
+ {
+ if (pqGetErrorNotice2(conn, false))
+ return;
+ }
+ else if (conn->asyncStatus != PGASYNC_BUSY)
+ {
+ /* If not IDLE state, just wait ... */
+ if (conn->asyncStatus != PGASYNC_IDLE)
+ return;
+
+ /*
+ * Unexpected message in IDLE state; need to recover somehow.
+ * ERROR messages are displayed using the notice processor;
+ * anything else is just dropped on the floor after displaying
+ * a suitable warning notice. (An ERROR is very possibly the
+ * backend telling us why it is about to close the connection,
+ * so we don't want to just discard it...)
+ */
+ if (id == 'E')
+ {
+ if (pqGetErrorNotice2(conn, false /* treat as notice */))
+ return;
+ }
+ else
+ {
+ snprintf(noticeWorkspace, sizeof(noticeWorkspace),
+ libpq_gettext("message type 0x%02x arrived from server while idle\n"),
+ id);
+ PGDONOTICE(conn, noticeWorkspace);
+ /* Discard the unexpected message; good idea?? */
+ conn->inStart = conn->inEnd;
+ break;
+ }
+ }
+ else
+ {
+ /*
+ * In BUSY state, we can process everything.
+ */
+ switch (id)
+ {
+ case 'C': /* command complete */
+ if (pqGets(&conn->workBuffer, conn))
+ return;
+ if (conn->result == NULL)
+ conn->result = PQmakeEmptyPGresult(conn,
+ PGRES_COMMAND_OK);
+ strncpy(conn->result->cmdStatus, conn->workBuffer.data,
+ CMDSTATUS_LEN);
+ conn->asyncStatus = PGASYNC_READY;
+ break;
+ case 'E': /* error return */
+ if (pqGetErrorNotice2(conn, true))
+ return;
+ conn->asyncStatus = PGASYNC_READY;
+ break;
+ case 'Z': /* backend is ready for new query */
+ conn->asyncStatus = PGASYNC_IDLE;
+ break;
+ case 'I': /* empty query */
+ /* read and throw away the closing '\0' */
+ if (pqGetc(&id, conn))
+ return;
+ if (id != '\0')
+ {
+ snprintf(noticeWorkspace, sizeof(noticeWorkspace),
+ libpq_gettext("unexpected character %c following empty query response (\"I\" message)\n"),
+ id);
+ PGDONOTICE(conn, noticeWorkspace);
+ }
+ if (conn->result == NULL)
+ conn->result = PQmakeEmptyPGresult(conn,
+ PGRES_EMPTY_QUERY);
+ conn->asyncStatus = PGASYNC_READY;
+ break;
+ case 'K': /* secret key data from the backend */
+
+ /*
+ * This is expected only during backend startup, but
+ * it's just as easy to handle it as part of the main
+ * loop. Save the data and continue processing.
+ */
+ if (pqGetInt(&(conn->be_pid), 4, conn))
+ return;
+ if (pqGetInt(&(conn->be_key), 4, conn))
+ return;
+ break;
+ case 'P': /* synchronous (normal) portal */
+ if (pqGets(&conn->workBuffer, conn))
+ return;
+ /* We pretty much ignore this message type... */
+ break;
+ case 'T': /* row descriptions (start of query
+ * results) */
+ if (conn->result == NULL)
+ {
+ /* First 'T' in a query sequence */
+ if (getRowDescriptions(conn))
+ return;
+ }
+ else
+ {
+ /*
+ * A new 'T' message is treated as the start of
+ * another PGresult. (It is not clear that this
+ * is really possible with the current backend.)
+ * We stop parsing until the application accepts
+ * the current result.
+ */
+ conn->asyncStatus = PGASYNC_READY;
+ return;
+ }
+ break;
+ case 'D': /* ASCII data tuple */
+ if (conn->result != NULL)
+ {
+ /* Read another tuple of a normal query response */
+ if (getAnotherTuple(conn, FALSE))
+ return;
+ }
+ else
+ {
+ snprintf(noticeWorkspace, sizeof(noticeWorkspace),
+ libpq_gettext("server sent data (\"D\" message) without prior row description (\"T\" message)\n"));
+ PGDONOTICE(conn, noticeWorkspace);
+ /* Discard the unexpected message; good idea?? */
+ conn->inStart = conn->inEnd;
+ return;
+ }
+ break;
+ case 'B': /* Binary data tuple */
+ if (conn->result != NULL)
+ {
+ /* Read another tuple of a normal query response */
+ if (getAnotherTuple(conn, TRUE))
+ return;
+ }
+ else
+ {
+ snprintf(noticeWorkspace, sizeof(noticeWorkspace),
+ libpq_gettext("server sent binary data (\"B\" message) without prior row description (\"T\" message)\n"));
+ PGDONOTICE(conn, noticeWorkspace);
+ /* Discard the unexpected message; good idea?? */
+ conn->inStart = conn->inEnd;
+ return;
+ }
+ break;
+ case 'G': /* Start Copy In */
+ conn->asyncStatus = PGASYNC_COPY_IN;
+ break;
+ case 'H': /* Start Copy Out */
+ conn->asyncStatus = PGASYNC_COPY_OUT;
+ break;
+ default:
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext(
+ "unexpected response from server; first received character was \"%c\"\n"),
+ id);
+ /* build an error result holding the error message */
+ pqSaveErrorResult(conn);
+ /* Discard the unexpected message; good idea?? */
+ conn->inStart = conn->inEnd;
+ conn->asyncStatus = PGASYNC_READY;
+ return;
+ } /* switch on protocol character */
+ }
+ /* Successfully consumed this message */
+ conn->inStart = conn->inCursor;
+ }
+}
+
+/*
+ * parseInput subroutine to read a 'T' (row descriptions) message.
+ * We build a PGresult structure containing the attribute data.
+ * Returns: 0 if completed message, EOF if not enough data yet.
+ *
+ * Note that if we run out of data, we have to release the partially
+ * constructed PGresult, and rebuild it again next time. Fortunately,
+ * that shouldn't happen often, since 'T' messages usually fit in a packet.
+ */
+static int
+getRowDescriptions(PGconn *conn)
+{
+ PGresult *result;
+ int nfields;
+ int i;
+
+ result = PQmakeEmptyPGresult(conn, PGRES_TUPLES_OK);
+
+ /* parseInput already read the 'T' label. */
+ /* the next two bytes are the number of fields */
+ if (pqGetInt(&(result->numAttributes), 2, conn))
+ {
+ PQclear(result);
+ return EOF;
+ }
+ nfields = result->numAttributes;
+
+ /* allocate space for the attribute descriptors */
+ if (nfields > 0)
+ {
+ result->attDescs = (PGresAttDesc *)
+ pqResultAlloc(result, nfields * sizeof(PGresAttDesc), TRUE);
+ MemSet((char *) result->attDescs, 0, nfields * sizeof(PGresAttDesc));
+ }
+
+ /* get type info */
+ for (i = 0; i < nfields; i++)
+ {
+ int typid;
+ int typlen;
+ int atttypmod;
+
+ if (pqGets(&conn->workBuffer, conn) ||
+ pqGetInt(&typid, 4, conn) ||
+ pqGetInt(&typlen, 2, conn) ||
+ pqGetInt(&atttypmod, 4, conn))
+ {
+ PQclear(result);
+ return EOF;
+ }
+
+ /*
+ * Since pqGetInt treats 2-byte integers as unsigned, we need to
+ * coerce the result to signed form.
+ */
+ typlen = (int) ((int16) typlen);
+
+ result->attDescs[i].name = pqResultStrdup(result,
+ conn->workBuffer.data);
+ result->attDescs[i].typid = typid;
+ result->attDescs[i].typlen = typlen;
+ result->attDescs[i].atttypmod = atttypmod;
+ }
+
+ /* Success! */
+ conn->result = result;
+ return 0;
+}
+
+/*
+ * parseInput subroutine to read a 'B' or 'D' (row data) message.
+ * We add another tuple to the existing PGresult structure.
+ * Returns: 0 if completed message, EOF if error or not enough data yet.
+ *
+ * Note that if we run out of data, we have to suspend and reprocess
+ * the message after more data is received. We keep a partially constructed
+ * tuple in conn->curTuple, and avoid reallocating already-allocated storage.
+ */
+static int
+getAnotherTuple(PGconn *conn, bool binary)
+{
+ PGresult *result = conn->result;
+ int nfields = result->numAttributes;
+ PGresAttValue *tup;
+
+ /* the backend sends us a bitmap of which attributes are null */
+ char std_bitmap[64]; /* used unless it doesn't fit */
+ char *bitmap = std_bitmap;
+ int i;
+ size_t nbytes; /* the number of bytes in bitmap */
+ char bmap; /* One byte of the bitmap */
+ int bitmap_index; /* Its index */
+ int bitcnt; /* number of bits examined in current byte */
+ int vlen; /* length of the current field value */
+
+ result->binary = binary;
+
+ /* Allocate tuple space if first time for this data message */
+ if (conn->curTuple == NULL)
+ {
+ conn->curTuple = (PGresAttValue *)
+ pqResultAlloc(result, nfields * sizeof(PGresAttValue), TRUE);
+ if (conn->curTuple == NULL)
+ goto outOfMemory;
+ MemSet((char *) conn->curTuple, 0, nfields * sizeof(PGresAttValue));
+ }
+ tup = conn->curTuple;
+
+ /* Get the null-value bitmap */
+ nbytes = (nfields + BITS_PER_BYTE - 1) / BITS_PER_BYTE;
+ /* malloc() only for unusually large field counts... */
+ if (nbytes > sizeof(std_bitmap))
+ bitmap = (char *) malloc(nbytes);
+
+ if (pqGetnchar(bitmap, nbytes, conn))
+ goto EOFexit;
+
+ /* Scan the fields */
+ bitmap_index = 0;
+ bmap = bitmap[bitmap_index];
+ bitcnt = 0;
+
+ for (i = 0; i < nfields; i++)
+ {
+ if (!(bmap & 0200))
+ {
+ /* if the field value is absent, make it a null string */
+ tup[i].value = result->null_field;
+ tup[i].len = NULL_LEN;
+ }
+ else
+ {
+ /* get the value length (the first four bytes are for length) */
+ if (pqGetInt(&vlen, 4, conn))
+ goto EOFexit;
+ if (!binary)
+ vlen = vlen - 4;
+ if (vlen < 0)
+ vlen = 0;
+ if (tup[i].value == NULL)
+ {
+ tup[i].value = (char *) pqResultAlloc(result, vlen + 1, binary);
+ if (tup[i].value == NULL)
+ goto outOfMemory;
+ }
+ tup[i].len = vlen;
+ /* read in the value */
+ if (vlen > 0)
+ if (pqGetnchar((char *) (tup[i].value), vlen, conn))
+ goto EOFexit;
+ /* we have to terminate this ourselves */
+ tup[i].value[vlen] = '\0';
+ }
+ /* advance the bitmap stuff */
+ bitcnt++;
+ if (bitcnt == BITS_PER_BYTE)
+ {
+ bitmap_index++;
+ bmap = bitmap[bitmap_index];
+ bitcnt = 0;
+ }
+ else
+ bmap <<= 1;
+ }
+
+ /* Success! Store the completed tuple in the result */
+ if (!pqAddTuple(result, tup))
+ goto outOfMemory;
+ /* and reset for a new message */
+ conn->curTuple = NULL;
+
+ if (bitmap != std_bitmap)
+ free(bitmap);
+ return 0;
+
+outOfMemory:
+ /* Replace partially constructed result with an error result */
+
+ /*
+ * we do NOT use pqSaveErrorResult() here, because of the likelihood
+ * that there's not enough memory to concatenate messages...
+ */
+ pqClearAsyncResult(conn);
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("out of memory for query result\n"));
+ conn->result = PQmakeEmptyPGresult(conn, PGRES_FATAL_ERROR);
+ conn->asyncStatus = PGASYNC_READY;
+ /* Discard the failed message --- good idea? */
+ conn->inStart = conn->inEnd;
+
+EOFexit:
+ if (bitmap != std_bitmap)
+ free(bitmap);
+ return EOF;
+}
+
+
+/*
+ * Attempt to read an Error or Notice response message.
+ * This is possible in several places, so we break it out as a subroutine.
+ * Entry: 'E' or 'N' message type has already been consumed.
+ * Exit: returns 0 if successfully consumed message.
+ * returns EOF if not enough data.
+ */
+static int
+pqGetErrorNotice2(PGconn *conn, bool isError)
+{
+ PGresult *res;
+ PQExpBufferData workBuf;
+
+ /*
+ * Since the message might be pretty long, we create a temporary
+ * PQExpBuffer rather than using conn->workBuffer. workBuffer is
+ * intended for stuff that is expected to be short.
+ */
+ initPQExpBuffer(&workBuf);
+ if (pqGets(&workBuf, conn))
+ {
+ termPQExpBuffer(&workBuf);
+ return EOF;
+ }
+
+ /*
+ * Make a PGresult to hold the message. We temporarily
+ * lie about the result status, so that PQmakeEmptyPGresult doesn't
+ * uselessly copy conn->errorMessage.
+ */
+ res = PQmakeEmptyPGresult(conn, PGRES_EMPTY_QUERY);
+ res->resultStatus = isError ? PGRES_FATAL_ERROR : PGRES_NONFATAL_ERROR;
+ res->errMsg = pqResultStrdup(res, workBuf.data);
+
+ /*
+ * Either save error as current async result, or just emit the notice.
+ */
+ if (isError)
+ {
+ pqClearAsyncResult(conn);
+ conn->result = res;
+ resetPQExpBuffer(&conn->errorMessage);
+ appendPQExpBufferStr(&conn->errorMessage, workBuf.data);
+ }
+ else
+ {
+ PGDONOTICE(conn, workBuf.data);
+ PQclear(res);
+ }
+
+ termPQExpBuffer(&workBuf);
+ return 0;
+}
+
+
+/*
+ * Attempt to read a Notify response message.
+ * This is possible in several places, so we break it out as a subroutine.
+ * Entry: 'A' message type and length have already been consumed.
+ * Exit: returns 0 if successfully consumed Notify message.
+ * returns EOF if not enough data.
+ */
+static int
+getNotify(PGconn *conn)
+{
+ int be_pid;
+ PGnotify *newNotify;
+
+ if (pqGetInt(&be_pid, 4, conn))
+ return EOF;
+ if (pqGets(&conn->workBuffer, conn))
+ return EOF;
+
+ /*
+ * Store the relation name right after the PQnotify structure so it
+ * can all be freed at once. We don't use NAMEDATALEN because we
+ * don't want to tie this interface to a specific server name length.
+ */
+ newNotify = (PGnotify *) malloc(sizeof(PGnotify) +
+ strlen(conn->workBuffer.data) +1);
+ if (newNotify)
+ {
+ newNotify->relname = (char *) newNotify + sizeof(PGnotify);
+ strcpy(newNotify->relname, conn->workBuffer.data);
+ newNotify->be_pid = be_pid;
+ DLAddTail(conn->notifyList, DLNewElem(newNotify));
+ }
+
+ return 0;
+}
+
+
+/*
+ * PQgetline - gets a newline-terminated string from the backend.
+ *
+ * See fe-exec.c for documentation.
+ */
+int
+pqGetline2(PGconn *conn, char *s, int maxlen)
+{
+ int result = 1; /* return value if buffer overflows */
+
+ if (conn->sock < 0)
+ {
+ *s = '\0';
+ return EOF;
+ }
+
+ /*
+ * Since this is a purely synchronous routine, we don't bother to
+ * maintain conn->inCursor; there is no need to back up.
+ */
+ while (maxlen > 1)
+ {
+ if (conn->inStart < conn->inEnd)
+ {
+ char c = conn->inBuffer[conn->inStart++];
+
+ if (c == '\n')
+ {
+ result = 0; /* success exit */
+ break;
+ }
+ *s++ = c;
+ maxlen--;
+ }
+ else
+ {
+ /* need to load more data */
+ if (pqWait(TRUE, FALSE, conn) ||
+ pqReadData(conn) < 0)
+ {
+ result = EOF;
+ break;
+ }
+ }
+ }
+ *s = '\0';
+
+ return result;
+}
+
+/*
+ * PQgetlineAsync - gets a COPY data row without blocking.
+ *
+ * See fe-exec.c for documentation.
+ */
+int
+pqGetlineAsync2(PGconn *conn, char *buffer, int bufsize)
+{
+ int avail;
+
+ if (conn->asyncStatus != PGASYNC_COPY_OUT)
+ return -1; /* we are not doing a copy... */
+
+ /*
+ * Move data from libpq's buffer to the caller's. We want to accept
+ * data only in units of whole lines, not partial lines. This ensures
+ * that we can recognize the terminator line "\\.\n". (Otherwise, if
+ * it happened to cross a packet/buffer boundary, we might hand the
+ * first one or two characters off to the caller, which we shouldn't.)
+ */
+
+ conn->inCursor = conn->inStart;
+
+ avail = bufsize;
+ while (avail > 0 && conn->inCursor < conn->inEnd)
+ {
+ char c = conn->inBuffer[conn->inCursor++];
+
+ *buffer++ = c;
+ --avail;
+ if (c == '\n')
+ {
+ /* Got a complete line; mark the data removed from libpq */
+ conn->inStart = conn->inCursor;
+ /* Is it the endmarker line? */
+ if (bufsize - avail == 3 && buffer[-3] == '\\' && buffer[-2] == '.')
+ return -1;
+ /* No, return the data line to the caller */
+ return bufsize - avail;
+ }
+ }
+
+ /*
+ * We don't have a complete line. We'd prefer to leave it in libpq's
+ * buffer until the rest arrives, but there is a special case: what if
+ * the line is longer than the buffer the caller is offering us? In
+ * that case we'd better hand over a partial line, else we'd get into
+ * an infinite loop. Do this in a way that ensures we can't
+ * misrecognize a terminator line later: leave last 3 characters in
+ * libpq buffer.
+ */
+ if (avail == 0 && bufsize > 3)
+ {
+ conn->inStart = conn->inCursor - 3;
+ return bufsize - 3;
+ }
+ return 0;
+}
+
+/*
+ * PQendcopy
+ *
+ * See fe-exec.c for documentation.
+ */
+int
+pqEndcopy2(PGconn *conn)
+{
+ PGresult *result;
+
+ if (conn->asyncStatus != PGASYNC_COPY_IN &&
+ conn->asyncStatus != PGASYNC_COPY_OUT)
+ {
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("no COPY in progress\n"));
+ return 1;
+ }
+
+ /*
+ * make sure no data is waiting to be sent, abort if we are
+ * non-blocking and the flush fails
+ */
+ if (pqFlush(conn) && pqIsnonblocking(conn))
+ return (1);
+
+ /* non blocking connections may have to abort at this point. */
+ if (pqIsnonblocking(conn) && PQisBusy(conn))
+ return (1);
+
+ /* Return to active duty */
+ conn->asyncStatus = PGASYNC_BUSY;
+ resetPQExpBuffer(&conn->errorMessage);
+
+ /* Wait for the completion response */
+ result = PQgetResult(conn);
+
+ /* Expecting a successful result */
+ if (result && result->resultStatus == PGRES_COMMAND_OK)
+ {
+ PQclear(result);
+ return 0;
+ }
+
+ /*
+ * Trouble. The worst case is that we've lost sync with the backend
+ * entirely due to application screwup of the copy in/out protocol. To
+ * recover, reset the connection (talk about using a sledgehammer...)
+ */
+ PQclear(result);
+
+ if (conn->errorMessage.len > 0)
+ PGDONOTICE(conn, conn->errorMessage.data);
+
+ PGDONOTICE(conn, libpq_gettext("lost synchronization with server, resetting connection\n"));
+
+ /*
+ * Users doing non-blocking connections need to handle the reset
+ * themselves, they'll need to check the connection status if we
+ * return an error.
+ */
+ if (pqIsnonblocking(conn))
+ PQresetStart(conn);
+ else
+ PQreset(conn);
+
+ return 1;
+}
+
+
+/*
+ * PQfn - Send a function call to the POSTGRES backend.
+ *
+ * See fe-exec.c for documentation.
+ */
+PGresult *
+pqFunctionCall2(PGconn *conn, Oid fnid,
+ int *result_buf, int *actual_result_len,
+ int result_is_int,
+ const PQArgBlock *args, int nargs)
+{
+ bool needInput = false;
+ ExecStatusType status = PGRES_FATAL_ERROR;
+ char id;
+ int i;
+
+ /* PQfn already validated connection state */
+
+ if (pqPutMsgStart('F', false, conn) < 0 || /* function call msg */
+ pqPuts(" ", conn) < 0 || /* dummy string */
+ pqPutInt(fnid, 4, conn) != 0 || /* function id */
+ pqPutInt(nargs, 4, conn) != 0) /* # of args */
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+
+ for (i = 0; i < nargs; ++i)
+ { /* len.int4 + contents */
+ if (pqPutInt(args[i].len, 4, conn))
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+
+ if (args[i].isint)
+ {
+ if (pqPutInt(args[i].u.integer, 4, conn))
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+ }
+ else
+ {
+ if (pqPutnchar((char *) args[i].u.ptr, args[i].len, conn))
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+ }
+ }
+
+ if (pqPutMsgEnd(conn) < 0 ||
+ pqFlush(conn))
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+
+ for (;;)
+ {
+ if (needInput)
+ {
+ /* Wait for some data to arrive (or for the channel to close) */
+ if (pqWait(TRUE, FALSE, conn) ||
+ pqReadData(conn) < 0)
+ break;
+ }
+
+ /*
+ * Scan the message. If we run out of data, loop around to try
+ * again.
+ */
+ conn->inCursor = conn->inStart;
+ needInput = true;
+
+ if (pqGetc(&id, conn))
+ continue;
+
+ /*
+ * We should see V or E response to the command, but might get N
+ * and/or A notices first. We also need to swallow the final Z
+ * before returning.
+ */
+ switch (id)
+ {
+ case 'V': /* function result */
+ if (pqGetc(&id, conn))
+ continue;
+ if (id == 'G')
+ {
+ /* function returned nonempty value */
+ if (pqGetInt(actual_result_len, 4, conn))
+ continue;
+ if (result_is_int)
+ {
+ if (pqGetInt(result_buf, 4, conn))
+ continue;
+ }
+ else
+ {
+ if (pqGetnchar((char *) result_buf,
+ *actual_result_len,
+ conn))
+ continue;
+ }
+ if (pqGetc(&id, conn)) /* get the last '0' */
+ continue;
+ }
+ if (id == '0')
+ {
+ /* correctly finished function result message */
+ status = PGRES_COMMAND_OK;
+ }
+ else
+ {
+ /* The backend violates the protocol. */
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("protocol error: id=0x%x\n"),
+ id);
+ pqSaveErrorResult(conn);
+ conn->inStart = conn->inCursor;
+ return pqPrepareAsyncResult(conn);
+ }
+ break;
+ case 'E': /* error return */
+ if (pqGetErrorNotice2(conn, true))
+ continue;
+ status = PGRES_FATAL_ERROR;
+ break;
+ case 'A': /* notify message */
+ /* handle notify and go back to processing return values */
+ if (getNotify(conn))
+ continue;
+ break;
+ case 'N': /* notice */
+ /* handle notice and go back to processing return values */
+ if (pqGetErrorNotice2(conn, false))
+ continue;
+ break;
+ case 'Z': /* backend is ready for new query */
+ /* consume the message and exit */
+ conn->inStart = conn->inCursor;
+ /* if we saved a result object (probably an error), use it */
+ if (conn->result)
+ return pqPrepareAsyncResult(conn);
+ return PQmakeEmptyPGresult(conn, status);
+ default:
+ /* The backend violates the protocol. */
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("protocol error: id=0x%x\n"),
+ id);
+ pqSaveErrorResult(conn);
+ conn->inStart = conn->inCursor;
+ return pqPrepareAsyncResult(conn);
+ }
+ /* Completed this message, keep going */
+ conn->inStart = conn->inCursor;
+ needInput = false;
+ }
+
+ /*
+ * We fall out of the loop only upon failing to read data.
+ * conn->errorMessage has been set by pqWait or pqReadData. We want to
+ * append it to any already-received error message.
+ */
+ pqSaveErrorResult(conn);
+ return pqPrepareAsyncResult(conn);
+}
+
+
+/*
+ * Construct startup packet
+ *
+ * Returns a malloc'd packet buffer, or NULL if out of memory
+ */
+char *
+pqBuildStartupPacket2(PGconn *conn, int *packetlen,
+ const PQEnvironmentOption *options)
+{
+ StartupPacket *startpacket;
+
+ *packetlen = sizeof(StartupPacket);
+ startpacket = (StartupPacket *) malloc(sizeof(StartupPacket));
+ if (!startpacket)
+ return NULL;
+
+ MemSet((char *) startpacket, 0, sizeof(StartupPacket));
+
+ startpacket->protoVersion = htonl(conn->pversion);
+
+ strncpy(startpacket->user, conn->pguser, SM_USER);
+ strncpy(startpacket->database, conn->dbName, SM_DATABASE);
+ strncpy(startpacket->tty, conn->pgtty, SM_TTY);
+
+ if (conn->pgoptions)
+ strncpy(startpacket->options, conn->pgoptions, SM_OPTIONS);
+
+ return (char *) startpacket;
+}
--- /dev/null
+/*-------------------------------------------------------------------------
+ *
+ * fe-protocol3.c
+ * functions that are specific to frontend/backend protocol version 3
+ *
+ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-protocol3.c,v 1.1 2003/06/08 17:43:00 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres_fe.h"
+
+#include <errno.h>
+#include <ctype.h>
+#include <fcntl.h>
+
+#include "libpq-fe.h"
+#include "libpq-int.h"
+
+#include "mb/pg_wchar.h"
+
+#ifdef WIN32
+#include "win32.h"
+#else
+#include <unistd.h>
+#include <netinet/in.h>
+#ifdef HAVE_NETINET_TCP_H
+#include <netinet/tcp.h>
+#endif
+#include <arpa/inet.h>
+#endif
+
+
+static void handleSyncLoss(PGconn *conn, char id, int msgLength);
+static int getRowDescriptions(PGconn *conn);
+static int getAnotherTuple(PGconn *conn, int msgLength);
+static int getParameterStatus(PGconn *conn);
+static int getNotify(PGconn *conn);
+static int build_startup_packet(const PGconn *conn, char *packet,
+ const PQEnvironmentOption *options);
+
+
+/*
+ * parseInput: if appropriate, parse input data from backend
+ * until input is exhausted or a stopping state is reached.
+ * Note that this function will NOT attempt to read more data from the backend.
+ */
+void
+pqParseInput3(PGconn *conn)
+{
+ char id;
+ int msgLength;
+ int avail;
+ char noticeWorkspace[128];
+
+ /*
+ * Loop to parse successive complete messages available in the buffer.
+ */
+ for (;;)
+ {
+ /*
+ * Try to read a message. First get the type code and length.
+ * Return if not enough data.
+ */
+ conn->inCursor = conn->inStart;
+ if (pqGetc(&id, conn))
+ return;
+ if (pqGetInt(&msgLength, 4, conn))
+ return;
+
+ /*
+ * Try to validate message type/length here. A length less than 4
+ * is definitely broken. Large lengths should only be believed
+ * for a few message types.
+ */
+ if (msgLength < 4)
+ {
+ handleSyncLoss(conn, id, msgLength);
+ return;
+ }
+ if (msgLength > 30000 &&
+ !(id == 'T' || id == 'D' || id == 'd'))
+ {
+ handleSyncLoss(conn, id, msgLength);
+ return;
+ }
+
+ /*
+ * Can't process if message body isn't all here yet.
+ */
+ msgLength -= 4;
+ avail = conn->inEnd - conn->inCursor;
+ if (avail < msgLength)
+ {
+ /*
+ * Before returning, enlarge the input buffer if needed to hold
+ * the whole message. This is better than leaving it to
+ * pqReadData because we can avoid multiple cycles of realloc()
+ * when the message is large; also, we can implement a reasonable
+ * recovery strategy if we are unable to make the buffer big
+ * enough.
+ */
+ if (pqCheckInBufferSpace(conn->inCursor + msgLength, conn))
+ {
+ /*
+ * XXX add some better recovery code... plan is to skip
+ * over the message using its length, then report an error.
+ * For the moment, just treat this like loss of sync (which
+ * indeed it might be!)
+ */
+ handleSyncLoss(conn, id, msgLength);
+ }
+ return;
+ }
+
+ /*
+ * NOTIFY and NOTICE messages can happen in any state; always process
+ * them right away.
+ *
+ * Most other messages should only be processed while in BUSY state.
+ * (In particular, in READY state we hold off further parsing
+ * until the application collects the current PGresult.)
+ *
+ * However, if the state is IDLE then we got trouble; we need to deal
+ * with the unexpected message somehow.
+ *
+ * ParameterStatus ('S') messages are a special case: in IDLE state
+ * we must process 'em (this case could happen if a new value was
+ * adopted from config file due to SIGHUP), but otherwise we hold
+ * off until BUSY state.
+ */
+ if (id == 'A')
+ {
+ if (getNotify(conn))
+ return;
+ }
+ else if (id == 'N')
+ {
+ if (pqGetErrorNotice3(conn, false))
+ return;
+ }
+ else if (conn->asyncStatus != PGASYNC_BUSY)
+ {
+ /* If not IDLE state, just wait ... */
+ if (conn->asyncStatus != PGASYNC_IDLE)
+ return;
+
+ /*
+ * Unexpected message in IDLE state; need to recover somehow.
+ * ERROR messages are displayed using the notice processor;
+ * ParameterStatus is handled normally;
+ * anything else is just dropped on the floor after displaying
+ * a suitable warning notice. (An ERROR is very possibly the
+ * backend telling us why it is about to close the connection,
+ * so we don't want to just discard it...)
+ */
+ if (id == 'E')
+ {
+ if (pqGetErrorNotice3(conn, false /* treat as notice */))
+ return;
+ }
+ else if (id == 'S')
+ {
+ if (getParameterStatus(conn))
+ return;
+ }
+ else
+ {
+ snprintf(noticeWorkspace, sizeof(noticeWorkspace),
+ libpq_gettext("message type 0x%02x arrived from server while idle\n"),
+ id);
+ PGDONOTICE(conn, noticeWorkspace);
+ /* Discard the unexpected message */
+ conn->inCursor += msgLength;
+ }
+ }
+ else
+ {
+ /*
+ * In BUSY state, we can process everything.
+ */
+ switch (id)
+ {
+ case 'C': /* command complete */
+ if (pqGets(&conn->workBuffer, conn))
+ return;
+ if (conn->result == NULL)
+ conn->result = PQmakeEmptyPGresult(conn,
+ PGRES_COMMAND_OK);
+ strncpy(conn->result->cmdStatus, conn->workBuffer.data,
+ CMDSTATUS_LEN);
+ conn->asyncStatus = PGASYNC_READY;
+ break;
+ case 'E': /* error return */
+ if (pqGetErrorNotice3(conn, true))
+ return;
+ conn->asyncStatus = PGASYNC_READY;
+ break;
+ case 'Z': /* backend is ready for new query */
+ if (pqGetc(&conn->xact_status, conn))
+ return;
+ conn->asyncStatus = PGASYNC_IDLE;
+ break;
+ case 'I': /* empty query */
+ if (conn->result == NULL)
+ conn->result = PQmakeEmptyPGresult(conn,
+ PGRES_EMPTY_QUERY);
+ conn->asyncStatus = PGASYNC_READY;
+ break;
+ case 'S': /* parameter status */
+ if (getParameterStatus(conn))
+ return;
+ break;
+ case 'K': /* secret key data from the backend */
+
+ /*
+ * This is expected only during backend startup, but
+ * it's just as easy to handle it as part of the main
+ * loop. Save the data and continue processing.
+ */
+ if (pqGetInt(&(conn->be_pid), 4, conn))
+ return;
+ if (pqGetInt(&(conn->be_key), 4, conn))
+ return;
+ break;
+ case 'T': /* row descriptions (start of query
+ * results) */
+ if (conn->result == NULL)
+ {
+ /* First 'T' in a query sequence */
+ if (getRowDescriptions(conn))
+ return;
+ }
+ else
+ {
+ /*
+ * A new 'T' message is treated as the start of
+ * another PGresult. (It is not clear that this
+ * is really possible with the current backend.)
+ * We stop parsing until the application accepts
+ * the current result.
+ */
+ conn->asyncStatus = PGASYNC_READY;
+ return;
+ }
+ break;
+ case 'D': /* Data Row */
+ if (conn->result != NULL &&
+ conn->result->resultStatus == PGRES_TUPLES_OK)
+ {
+ /* Read another tuple of a normal query response */
+ if (getAnotherTuple(conn, msgLength))
+ return;
+ }
+ else if (conn->result != NULL &&
+ conn->result->resultStatus == PGRES_FATAL_ERROR)
+ {
+ /*
+ * We've already choked for some reason. Just discard
+ * tuples till we get to the end of the query.
+ */
+ conn->inCursor += msgLength;
+ }
+ else
+ {
+ /* Set up to report error at end of query */
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("server sent data (\"D\" message) without prior row description (\"T\" message)\n"));
+ pqSaveErrorResult(conn);
+ /* Discard the unexpected message */
+ conn->inCursor += msgLength;
+ }
+ break;
+ case 'G': /* Start Copy In */
+ if (pqGetc(&conn->copy_is_binary, conn))
+ return;
+ /* XXX we currently ignore the rest of the message */
+ conn->inCursor = conn->inStart + 5 + msgLength;
+ conn->asyncStatus = PGASYNC_COPY_IN;
+ break;
+ case 'H': /* Start Copy Out */
+ if (pqGetc(&conn->copy_is_binary, conn))
+ return;
+ /* XXX we currently ignore the rest of the message */
+ conn->inCursor = conn->inStart + 5 + msgLength;
+ conn->asyncStatus = PGASYNC_COPY_OUT;
+ conn->copy_already_done = 0;
+ break;
+ case 'd': /* Copy Data */
+ /*
+ * If we see Copy Data, just silently drop it. This
+ * would only occur if application exits COPY OUT mode
+ * too early.
+ */
+ conn->inCursor += msgLength;
+ break;
+ case 'c': /* Copy Done */
+ /*
+ * If we see Copy Done, just silently drop it. This
+ * is the normal case during PQendcopy. We will keep
+ * swallowing data, expecting to see command-complete
+ * for the COPY command.
+ */
+ break;
+ default:
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext(
+ "unexpected response from server; first received character was \"%c\"\n"),
+ id);
+ /* build an error result holding the error message */
+ pqSaveErrorResult(conn);
+ /* not sure if we will see more, so go to ready state */
+ conn->asyncStatus = PGASYNC_READY;
+ /* Discard the unexpected message */
+ conn->inCursor += msgLength;
+ break;
+ } /* switch on protocol character */
+ }
+ /* Successfully consumed this message */
+ if (conn->inCursor == conn->inStart + 5 + msgLength)
+ {
+ /* Normal case: parsing agrees with specified length */
+ conn->inStart = conn->inCursor;
+ }
+ else
+ {
+ /* Trouble --- report it */
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("Message contents do not agree with length in message type \"%c\"\n"),
+ id);
+ /* build an error result holding the error message */
+ pqSaveErrorResult(conn);
+ conn->asyncStatus = PGASYNC_READY;
+ /* trust the specified message length as what to skip */
+ conn->inStart += 5 + msgLength;
+ }
+ }
+}
+
+/*
+ * handleSyncLoss: clean up after loss of message-boundary sync
+ *
+ * There isn't really a lot we can do here except abandon the connection.
+ */
+static void
+handleSyncLoss(PGconn *conn, char id, int msgLength)
+{
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext(
+ "lost synchronization with server: got message type \"%c\", length %d\n"),
+ id, msgLength);
+ /* build an error result holding the error message */
+ pqSaveErrorResult(conn);
+ conn->asyncStatus = PGASYNC_READY; /* drop out of GetResult wait loop */
+
+ pqsecure_close(conn);
+ closesocket(conn->sock);
+ conn->sock = -1;
+ conn->status = CONNECTION_BAD; /* No more connection to backend */
+}
+
+/*
+ * parseInput subroutine to read a 'T' (row descriptions) message.
+ * We build a PGresult structure containing the attribute data.
+ * Returns: 0 if completed message, EOF if not enough data yet.
+ *
+ * Note that if we run out of data, we have to release the partially
+ * constructed PGresult, and rebuild it again next time. Fortunately,
+ * that shouldn't happen often, since 'T' messages usually fit in a packet.
+ */
+static int
+getRowDescriptions(PGconn *conn)
+{
+ PGresult *result;
+ int nfields;
+ int i;
+
+ result = PQmakeEmptyPGresult(conn, PGRES_TUPLES_OK);
+
+ /* parseInput already read the 'T' label and message length. */
+ /* the next two bytes are the number of fields */
+ if (pqGetInt(&(result->numAttributes), 2, conn))
+ {
+ PQclear(result);
+ return EOF;
+ }
+ nfields = result->numAttributes;
+
+ /* allocate space for the attribute descriptors */
+ if (nfields > 0)
+ {
+ result->attDescs = (PGresAttDesc *)
+ pqResultAlloc(result, nfields * sizeof(PGresAttDesc), TRUE);
+ MemSet((char *) result->attDescs, 0, nfields * sizeof(PGresAttDesc));
+ }
+
+ /* get type info */
+ for (i = 0; i < nfields; i++)
+ {
+ int tableid;
+ int columnid;
+ int typid;
+ int typlen;
+ int atttypmod;
+ int format;
+
+ if (pqGets(&conn->workBuffer, conn) ||
+ pqGetInt(&tableid, 4, conn) ||
+ pqGetInt(&columnid, 2, conn) ||
+ pqGetInt(&typid, 4, conn) ||
+ pqGetInt(&typlen, 2, conn) ||
+ pqGetInt(&atttypmod, 4, conn) ||
+ pqGetInt(&format, 2, conn))
+ {
+ PQclear(result);
+ return EOF;
+ }
+
+ /*
+ * Since pqGetInt treats 2-byte integers as unsigned, we need to
+ * coerce these results to signed form.
+ */
+ columnid = (int) ((int16) columnid);
+ typlen = (int) ((int16) typlen);
+ format = (int) ((int16) format);
+
+ result->attDescs[i].name = pqResultStrdup(result,
+ conn->workBuffer.data);
+ result->attDescs[i].typid = typid;
+ result->attDescs[i].typlen = typlen;
+ result->attDescs[i].atttypmod = atttypmod;
+ /* XXX todo: save tableid/columnid, format too */
+ }
+
+ /* Success! */
+ conn->result = result;
+ return 0;
+}
+
+/*
+ * parseInput subroutine to read a 'D' (row data) message.
+ * We add another tuple to the existing PGresult structure.
+ * Returns: 0 if completed message, EOF if error or not enough data yet.
+ *
+ * Note that if we run out of data, we have to suspend and reprocess
+ * the message after more data is received. We keep a partially constructed
+ * tuple in conn->curTuple, and avoid reallocating already-allocated storage.
+ */
+static int
+getAnotherTuple(PGconn *conn, int msgLength)
+{
+ PGresult *result = conn->result;
+ int nfields = result->numAttributes;
+ PGresAttValue *tup;
+ int tupnfields; /* # fields from tuple */
+ int vlen; /* length of the current field value */
+ int i;
+
+ /* Allocate tuple space if first time for this data message */
+ if (conn->curTuple == NULL)
+ {
+ conn->curTuple = (PGresAttValue *)
+ pqResultAlloc(result, nfields * sizeof(PGresAttValue), TRUE);
+ if (conn->curTuple == NULL)
+ goto outOfMemory;
+ MemSet((char *) conn->curTuple, 0, nfields * sizeof(PGresAttValue));
+ }
+ tup = conn->curTuple;
+
+ /* Get the field count and make sure it's what we expect */
+ if (pqGetInt(&tupnfields, 2, conn))
+ return EOF;
+
+ if (tupnfields != nfields)
+ {
+ /* Replace partially constructed result with an error result */
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("unexpected field count in D message\n"));
+ pqSaveErrorResult(conn);
+ /* Discard the failed message by pretending we read it */
+ conn->inCursor = conn->inStart + 5 + msgLength;
+ return 0;
+ }
+
+ /* Scan the fields */
+ for (i = 0; i < nfields; i++)
+ {
+ /* get the value length */
+ if (pqGetInt(&vlen, 4, conn))
+ return EOF;
+ if (vlen == -1)
+ {
+ /* null field */
+ tup[i].value = result->null_field;
+ tup[i].len = NULL_LEN;
+ continue;
+ }
+ if (vlen < 0)
+ vlen = 0;
+ if (tup[i].value == NULL)
+ {
+ tup[i].value = (char *) pqResultAlloc(result, vlen + 1, false);
+ if (tup[i].value == NULL)
+ goto outOfMemory;
+ }
+ tup[i].len = vlen;
+ /* read in the value */
+ if (vlen > 0)
+ if (pqGetnchar((char *) (tup[i].value), vlen, conn))
+ return EOF;
+ /* we have to terminate this ourselves */
+ tup[i].value[vlen] = '\0';
+ }
+
+ /* Success! Store the completed tuple in the result */
+ if (!pqAddTuple(result, tup))
+ goto outOfMemory;
+ /* and reset for a new message */
+ conn->curTuple = NULL;
+
+ return 0;
+
+outOfMemory:
+ /*
+ * Replace partially constructed result with an error result.
+ * First discard the old result to try to win back some memory.
+ */
+ pqClearAsyncResult(conn);
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("out of memory for query result\n"));
+ pqSaveErrorResult(conn);
+
+ /* Discard the failed message by pretending we read it */
+ conn->inCursor = conn->inStart + 5 + msgLength;
+ return 0;
+}
+
+
+/*
+ * Attempt to read an Error or Notice response message.
+ * This is possible in several places, so we break it out as a subroutine.
+ * Entry: 'E' or 'N' message type and length have already been consumed.
+ * Exit: returns 0 if successfully consumed message.
+ * returns EOF if not enough data.
+ */
+int
+pqGetErrorNotice3(PGconn *conn, bool isError)
+{
+ PGresult *res;
+ PQExpBufferData workBuf;
+ char id;
+
+ /*
+ * Make a PGresult to hold the accumulated fields. We temporarily
+ * lie about the result status, so that PQmakeEmptyPGresult doesn't
+ * uselessly copy conn->errorMessage.
+ */
+ res = PQmakeEmptyPGresult(conn, PGRES_EMPTY_QUERY);
+ res->resultStatus = isError ? PGRES_FATAL_ERROR : PGRES_NONFATAL_ERROR;
+ /*
+ * Since the fields might be pretty long, we create a temporary
+ * PQExpBuffer rather than using conn->workBuffer. workBuffer is
+ * intended for stuff that is expected to be short. We shouldn't
+ * use conn->errorMessage either, since this might be only a notice.
+ */
+ initPQExpBuffer(&workBuf);
+
+ /*
+ * Read the fields and save into res.
+ */
+ for (;;)
+ {
+ if (pqGetc(&id, conn))
+ goto fail;
+ if (id == '\0')
+ break; /* terminator found */
+ if (pqGets(&workBuf, conn))
+ goto fail;
+ switch (id)
+ {
+ case 'S':
+ res->errSeverity = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'C':
+ res->errCode = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'M':
+ res->errPrimary = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'D':
+ res->errDetail = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'H':
+ res->errHint = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'P':
+ res->errPosition = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'W':
+ res->errContext = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'F':
+ res->errFilename = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'L':
+ res->errLineno = pqResultStrdup(res, workBuf.data);
+ break;
+ case 'R':
+ res->errFuncname = pqResultStrdup(res, workBuf.data);
+ break;
+ default:
+ /* silently ignore any other field type */
+ break;
+ }
+ }
+
+ /*
+ * Now build the "overall" error message for PQresultErrorMessage.
+ *
+ * XXX this should be configurable somehow.
+ */
+ resetPQExpBuffer(&workBuf);
+ if (res->errSeverity)
+ appendPQExpBuffer(&workBuf, "%s: ", res->errSeverity);
+ if (res->errPrimary)
+ appendPQExpBufferStr(&workBuf, res->errPrimary);
+ /* translator: %s represents a digit string */
+ if (res->errPosition)
+ appendPQExpBuffer(&workBuf, libpq_gettext(" at character %s"),
+ res->errPosition);
+ appendPQExpBufferChar(&workBuf, '\n');
+ if (res->errDetail)
+ appendPQExpBuffer(&workBuf, libpq_gettext("DETAIL: %s\n"),
+ res->errDetail);
+ if (res->errHint)
+ appendPQExpBuffer(&workBuf, libpq_gettext("HINT: %s\n"),
+ res->errHint);
+ if (res->errContext)
+ appendPQExpBuffer(&workBuf, libpq_gettext("CONTEXT: %s\n"),
+ res->errContext);
+
+ /*
+ * Either save error as current async result, or just emit the notice.
+ */
+ if (isError)
+ {
+ res->errMsg = pqResultStrdup(res, workBuf.data);
+ pqClearAsyncResult(conn);
+ conn->result = res;
+ resetPQExpBuffer(&conn->errorMessage);
+ appendPQExpBufferStr(&conn->errorMessage, workBuf.data);
+ }
+ else
+ {
+ PGDONOTICE(conn, workBuf.data);
+ PQclear(res);
+ }
+
+ termPQExpBuffer(&workBuf);
+ return 0;
+
+fail:
+ PQclear(res);
+ termPQExpBuffer(&workBuf);
+ return EOF;
+}
+
+
+/*
+ * Attempt to read a ParameterStatus message.
+ * This is possible in several places, so we break it out as a subroutine.
+ * Entry: 'S' message type and length have already been consumed.
+ * Exit: returns 0 if successfully consumed message.
+ * returns EOF if not enough data.
+ */
+static int
+getParameterStatus(PGconn *conn)
+{
+ PQExpBufferData valueBuf;
+
+ /* Get the parameter name */
+ if (pqGets(&conn->workBuffer, conn))
+ return EOF;
+ /* Get the parameter value (could be large) */
+ initPQExpBuffer(&valueBuf);
+ if (pqGets(&valueBuf, conn))
+ {
+ termPQExpBuffer(&valueBuf);
+ return EOF;
+ }
+ /* And save it */
+ pqSaveParameterStatus(conn, conn->workBuffer.data, valueBuf.data);
+ termPQExpBuffer(&valueBuf);
+ return 0;
+}
+
+
+/*
+ * Attempt to read a Notify response message.
+ * This is possible in several places, so we break it out as a subroutine.
+ * Entry: 'A' message type and length have already been consumed.
+ * Exit: returns 0 if successfully consumed Notify message.
+ * returns EOF if not enough data.
+ */
+static int
+getNotify(PGconn *conn)
+{
+ int be_pid;
+ PGnotify *newNotify;
+
+ if (pqGetInt(&be_pid, 4, conn))
+ return EOF;
+ if (pqGets(&conn->workBuffer, conn))
+ return EOF;
+
+ /*
+ * Store the relation name right after the PQnotify structure so it
+ * can all be freed at once. We don't use NAMEDATALEN because we
+ * don't want to tie this interface to a specific server name length.
+ */
+ newNotify = (PGnotify *) malloc(sizeof(PGnotify) +
+ strlen(conn->workBuffer.data) +1);
+ if (newNotify)
+ {
+ newNotify->relname = (char *) newNotify + sizeof(PGnotify);
+ strcpy(newNotify->relname, conn->workBuffer.data);
+ newNotify->be_pid = be_pid;
+ DLAddTail(conn->notifyList, DLNewElem(newNotify));
+ }
+
+ /* Swallow extra string (not presently used) */
+ if (pqGets(&conn->workBuffer, conn))
+ return EOF;
+
+ return 0;
+}
+
+
+/*
+ * PQgetline - gets a newline-terminated string from the backend.
+ *
+ * See fe-exec.c for documentation.
+ */
+int
+pqGetline3(PGconn *conn, char *s, int maxlen)
+{
+ int status;
+
+ if (conn->sock < 0 ||
+ conn->asyncStatus != PGASYNC_COPY_OUT ||
+ conn->copy_is_binary)
+ {
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("PQgetline: not doing text COPY OUT\n"));
+ *s = '\0';
+ return EOF;
+ }
+
+ while ((status = PQgetlineAsync(conn, s, maxlen-1)) == 0)
+ {
+ /* need to load more data */
+ if (pqWait(TRUE, FALSE, conn) ||
+ pqReadData(conn) < 0)
+ {
+ *s = '\0';
+ return EOF;
+ }
+ }
+
+ if (status < 0)
+ {
+ /* End of copy detected; gin up old-style terminator */
+ strcpy(s, "\\.");
+ return 0;
+ }
+
+ /* Add null terminator, and strip trailing \n if present */
+ if (s[status-1] == '\n')
+ {
+ s[status-1] = '\0';
+ return 0;
+ }
+ else
+ {
+ s[status] = '\0';
+ return 1;
+ }
+}
+
+/*
+ * PQgetlineAsync - gets a COPY data row without blocking.
+ *
+ * See fe-exec.c for documentation.
+ */
+int
+pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize)
+{
+ char id;
+ int msgLength;
+ int avail;
+
+ if (conn->asyncStatus != PGASYNC_COPY_OUT)
+ return -1; /* we are not doing a copy... */
+
+ /*
+ * Recognize the next input message. To make life simpler for async
+ * callers, we keep returning 0 until the next message is fully available
+ * even if it is not Copy Data. This should keep PQendcopy from blocking.
+ */
+ conn->inCursor = conn->inStart;
+ if (pqGetc(&id, conn))
+ return 0;
+ if (pqGetInt(&msgLength, 4, conn))
+ return 0;
+ avail = conn->inEnd - conn->inCursor;
+ if (avail < msgLength - 4)
+ return 0;
+
+ /*
+ * Cannot proceed unless it's a Copy Data message. Anything else means
+ * end of copy mode.
+ */
+ if (id != 'd')
+ return -1;
+
+ /*
+ * Move data from libpq's buffer to the caller's. In the case where
+ * a prior call found the caller's buffer too small, we use
+ * conn->copy_already_done to remember how much of the row was already
+ * returned to the caller.
+ */
+ conn->inCursor += conn->copy_already_done;
+ avail = msgLength - 4 - conn->copy_already_done;
+ if (avail <= bufsize)
+ {
+ /* Able to consume the whole message */
+ memcpy(buffer, &conn->inBuffer[conn->inCursor], avail);
+ /* Mark message consumed */
+ conn->inStart = conn->inCursor + avail;
+ /* Reset state for next time */
+ conn->copy_already_done = 0;
+ return avail;
+ }
+ else
+ {
+ /* We must return a partial message */
+ memcpy(buffer, &conn->inBuffer[conn->inCursor], bufsize);
+ /* The message is NOT consumed from libpq's buffer */
+ conn->copy_already_done += bufsize;
+ return bufsize;
+ }
+}
+
+/*
+ * PQendcopy
+ *
+ * See fe-exec.c for documentation.
+ */
+int
+pqEndcopy3(PGconn *conn)
+{
+ PGresult *result;
+
+ if (conn->asyncStatus != PGASYNC_COPY_IN &&
+ conn->asyncStatus != PGASYNC_COPY_OUT)
+ {
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("no COPY in progress\n"));
+ return 1;
+ }
+
+ /* Send the CopyDone message if needed */
+ if (conn->asyncStatus == PGASYNC_COPY_IN)
+ {
+ if (pqPutMsgStart('c', false, conn) < 0 ||
+ pqPutMsgEnd(conn) < 0)
+ return 1;
+ }
+
+ /*
+ * make sure no data is waiting to be sent, abort if we are
+ * non-blocking and the flush fails
+ */
+ if (pqFlush(conn) && pqIsnonblocking(conn))
+ return (1);
+
+ /* Return to active duty */
+ conn->asyncStatus = PGASYNC_BUSY;
+ resetPQExpBuffer(&conn->errorMessage);
+
+ /*
+ * Non blocking connections may have to abort at this point. If everyone
+ * played the game there should be no problem, but in error scenarios
+ * the expected messages may not have arrived yet. (We are assuming that
+ * the backend's packetizing will ensure that CommandComplete arrives
+ * along with the CopyDone; are there corner cases where that doesn't
+ * happen?)
+ */
+ if (pqIsnonblocking(conn) && PQisBusy(conn))
+ return (1);
+
+ /* Wait for the completion response */
+ result = PQgetResult(conn);
+
+ /* Expecting a successful result */
+ if (result && result->resultStatus == PGRES_COMMAND_OK)
+ {
+ PQclear(result);
+ return 0;
+ }
+
+ /*
+ * Trouble. For backwards-compatibility reasons, we issue the error
+ * message as if it were a notice (would be nice to get rid of this
+ * silliness, but too many apps probably don't handle errors from
+ * PQendcopy reasonably). Note that the app can still obtain the
+ * error status from the PGconn object.
+ */
+ if (conn->errorMessage.len > 0)
+ PGDONOTICE(conn, conn->errorMessage.data);
+
+ PQclear(result);
+
+ return 1;
+}
+
+
+/*
+ * PQfn - Send a function call to the POSTGRES backend.
+ *
+ * See fe-exec.c for documentation.
+ */
+PGresult *
+pqFunctionCall3(PGconn *conn, Oid fnid,
+ int *result_buf, int *actual_result_len,
+ int result_is_int,
+ const PQArgBlock *args, int nargs)
+{
+ bool needInput = false;
+ ExecStatusType status = PGRES_FATAL_ERROR;
+ char id;
+ int msgLength;
+ int avail;
+ int i;
+
+ /* PQfn already validated connection state */
+
+ if (pqPutMsgStart('F', false, conn) < 0 || /* function call msg */
+ pqPutInt(fnid, 4, conn) < 0 || /* function id */
+ pqPutInt(1, 2, conn) < 0 || /* # of format codes */
+ pqPutInt(1, 2, conn) < 0 || /* format code: BINARY */
+ pqPutInt(nargs, 2, conn) < 0) /* # of args */
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+
+ for (i = 0; i < nargs; ++i)
+ { /* len.int4 + contents */
+ if (pqPutInt(args[i].len, 4, conn))
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+ if (args[i].len == -1)
+ continue; /* it's NULL */
+
+ if (args[i].isint)
+ {
+ if (pqPutInt(args[i].u.integer, args[i].len, conn))
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+ }
+ else
+ {
+ if (pqPutnchar((char *) args[i].u.ptr, args[i].len, conn))
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+ }
+ }
+
+ if (pqPutInt(1, 2, conn) < 0) /* result format code: BINARY */
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+
+ if (pqPutMsgEnd(conn) < 0 ||
+ pqFlush(conn))
+ {
+ pqHandleSendFailure(conn);
+ return NULL;
+ }
+
+ for (;;)
+ {
+ if (needInput)
+ {
+ /* Wait for some data to arrive (or for the channel to close) */
+ if (pqWait(TRUE, FALSE, conn) ||
+ pqReadData(conn) < 0)
+ break;
+ }
+
+ /*
+ * Scan the message. If we run out of data, loop around to try
+ * again.
+ */
+ needInput = true;
+
+ conn->inCursor = conn->inStart;
+ if (pqGetc(&id, conn))
+ continue;
+ if (pqGetInt(&msgLength, 4, conn))
+ continue;
+
+ /*
+ * Try to validate message type/length here. A length less than 4
+ * is definitely broken. Large lengths should only be believed
+ * for a few message types.
+ */
+ if (msgLength < 4)
+ {
+ handleSyncLoss(conn, id, msgLength);
+ break;
+ }
+ if (msgLength > 30000 &&
+ !(id == 'T' || id == 'D' || id == 'd' || id == 'V'))
+ {
+ handleSyncLoss(conn, id, msgLength);
+ break;
+ }
+
+ /*
+ * Can't process if message body isn't all here yet.
+ */
+ msgLength -= 4;
+ avail = conn->inEnd - conn->inCursor;
+ if (avail < msgLength)
+ {
+ /*
+ * Before looping, enlarge the input buffer if needed to hold
+ * the whole message. See notes in parseInput.
+ */
+ if (pqCheckInBufferSpace(conn->inCursor + msgLength, conn))
+ {
+ /*
+ * XXX add some better recovery code... plan is to skip
+ * over the message using its length, then report an error.
+ * For the moment, just treat this like loss of sync (which
+ * indeed it might be!)
+ */
+ handleSyncLoss(conn, id, msgLength);
+ break;
+ }
+ continue;
+ }
+
+ /*
+ * We should see V or E response to the command, but might get N
+ * and/or A notices first. We also need to swallow the final Z
+ * before returning.
+ */
+ switch (id)
+ {
+ case 'V': /* function result */
+ if (pqGetInt(actual_result_len, 4, conn))
+ continue;
+ if (*actual_result_len != -1)
+ {
+ if (result_is_int)
+ {
+ if (pqGetInt(result_buf, *actual_result_len, conn))
+ continue;
+ }
+ else
+ {
+ if (pqGetnchar((char *) result_buf,
+ *actual_result_len,
+ conn))
+ continue;
+ }
+ }
+ /* correctly finished function result message */
+ status = PGRES_COMMAND_OK;
+ break;
+ case 'E': /* error return */
+ if (pqGetErrorNotice3(conn, true))
+ continue;
+ status = PGRES_FATAL_ERROR;
+ break;
+ case 'A': /* notify message */
+ /* handle notify and go back to processing return values */
+ if (getNotify(conn))
+ continue;
+ break;
+ case 'N': /* notice */
+ /* handle notice and go back to processing return values */
+ if (pqGetErrorNotice3(conn, false))
+ continue;
+ break;
+ case 'Z': /* backend is ready for new query */
+ if (pqGetc(&conn->xact_status, conn))
+ continue;
+ /* consume the message and exit */
+ conn->inStart += 5 + msgLength;
+ /* if we saved a result object (probably an error), use it */
+ if (conn->result)
+ return pqPrepareAsyncResult(conn);
+ return PQmakeEmptyPGresult(conn, status);
+ case 'S': /* parameter status */
+ if (getParameterStatus(conn))
+ continue;
+ break;
+ default:
+ /* The backend violates the protocol. */
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("protocol error: id=0x%x\n"),
+ id);
+ pqSaveErrorResult(conn);
+ /* trust the specified message length as what to skip */
+ conn->inStart += 5 + msgLength;
+ return pqPrepareAsyncResult(conn);
+ }
+ /* Completed this message, keep going */
+ /* trust the specified message length as what to skip */
+ conn->inStart += 5 + msgLength;
+ needInput = false;
+ }
+
+ /*
+ * We fall out of the loop only upon failing to read data.
+ * conn->errorMessage has been set by pqWait or pqReadData. We want to
+ * append it to any already-received error message.
+ */
+ pqSaveErrorResult(conn);
+ return pqPrepareAsyncResult(conn);
+}
+
+
+/*
+ * Construct startup packet
+ *
+ * Returns a malloc'd packet buffer, or NULL if out of memory
+ */
+char *
+pqBuildStartupPacket3(PGconn *conn, int *packetlen,
+ const PQEnvironmentOption *options)
+{
+ char *startpacket;
+
+ *packetlen = build_startup_packet(conn, NULL, options);
+ startpacket = (char *) malloc(*packetlen);
+ if (!startpacket)
+ return NULL;
+ *packetlen = build_startup_packet(conn, startpacket, options);
+ return startpacket;
+}
+
+/*
+ * Build a startup packet given a filled-in PGconn structure.
+ *
+ * We need to figure out how much space is needed, then fill it in.
+ * To avoid duplicate logic, this routine is called twice: the first time
+ * (with packet == NULL) just counts the space needed, the second time
+ * (with packet == allocated space) fills it in. Return value is the number
+ * of bytes used.
+ */
+static int
+build_startup_packet(const PGconn *conn, char *packet,
+ const PQEnvironmentOption *options)
+{
+ int packet_len = 0;
+ const PQEnvironmentOption *next_eo;
+
+ /* Protocol version comes first. */
+ if (packet)
+ {
+ ProtocolVersion pv = htonl(conn->pversion);
+
+ memcpy(packet + packet_len, &pv, sizeof(ProtocolVersion));
+ }
+ packet_len += sizeof(ProtocolVersion);
+
+ /* Add user name, database name, options */
+ if (conn->pguser && conn->pguser[0])
+ {
+ if (packet)
+ strcpy(packet + packet_len, "user");
+ packet_len += strlen("user") + 1;
+ if (packet)
+ strcpy(packet + packet_len, conn->pguser);
+ packet_len += strlen(conn->pguser) + 1;
+ }
+ if (conn->dbName && conn->dbName[0])
+ {
+ if (packet)
+ strcpy(packet + packet_len, "database");
+ packet_len += strlen("database") + 1;
+ if (packet)
+ strcpy(packet + packet_len, conn->dbName);
+ packet_len += strlen(conn->dbName) + 1;
+ }
+ if (conn->pgoptions && conn->pgoptions[0])
+ {
+ if (packet)
+ strcpy(packet + packet_len, "options");
+ packet_len += strlen("options") + 1;
+ if (packet)
+ strcpy(packet + packet_len, conn->pgoptions);
+ packet_len += strlen(conn->pgoptions) + 1;
+ }
+
+ /* Add any environment-driven GUC settings needed */
+ for (next_eo = options; next_eo->envName; next_eo++)
+ {
+ const char *val;
+
+ if ((val = getenv(next_eo->envName)) != NULL)
+ {
+ if (strcasecmp(val, "default") != 0)
+ {
+ if (packet)
+ strcpy(packet + packet_len, next_eo->pgName);
+ packet_len += strlen(next_eo->pgName) + 1;
+ if (packet)
+ strcpy(packet + packet_len, val);
+ packet_len += strlen(val) + 1;
+ }
+ }
+ }
+
+ /* Add trailing terminator */
+ if (packet)
+ packet[packet_len] = '\0';
+ packet_len++;
+
+ return packet_len;
+}
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-secure.c,v 1.22 2003/04/10 23:03:08 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-secure.c,v 1.23 2003/06/08 17:43:00 tgl Exp $
*
* NOTES
* The client *requires* a valid server certificate. Since
static int client_cert_cb(SSL *, X509 **, EVP_PKEY **);
static int initialize_SSL(PGconn *);
static void destroy_SSL(void);
-static int open_client_SSL(PGconn *);
+static PostgresPollingStatusType open_client_SSL(PGconn *);
static void close_SSL(PGconn *);
static const char *SSLerrmessage(void);
#endif
/*
* Attempt to negotiate secure session.
*/
-int
+PostgresPollingStatusType
pqsecure_open_client(PGconn *conn)
{
- int r = 0;
-
#ifdef USE_SSL
- r = open_client_SSL(conn);
+ /* First time through? */
+ if (conn->ssl == NULL)
+ {
+ if (!(conn->ssl = SSL_new(SSL_context)) ||
+ !SSL_set_app_data(conn->ssl, conn) ||
+ !SSL_set_fd(conn->ssl, conn->sock))
+ {
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("could not establish SSL connection: %s\n"),
+ SSLerrmessage());
+ close_SSL(conn);
+ return PGRES_POLLING_FAILED;
+ }
+ }
+ /* Begin or continue the actual handshake */
+ return open_client_SSL(conn);
+#else
+ /* shouldn't get here */
+ return PGRES_POLLING_FAILED;
#endif
-
- return r;
}
/*
case SSL_ERROR_NONE:
break;
case SSL_ERROR_WANT_READ:
+ n = 0;
+ break;
case SSL_ERROR_WANT_WRITE:
- /* XXX to support nonblock I/O, we should return 0 here */
+ /*
+ * Returning 0 here would cause caller to wait for read-ready,
+ * which is not correct since what SSL wants is wait for
+ * write-ready. The former could get us stuck in an infinite
+ * wait, so don't risk it; busy-loop instead.
+ */
goto rloop;
case SSL_ERROR_SYSCALL:
if (n == -1)
#ifdef USE_SSL
if (conn->ssl)
{
- wloop:
n = SSL_write(conn->ssl, ptr, len);
switch (SSL_get_error(conn->ssl, n))
{
case SSL_ERROR_NONE:
break;
case SSL_ERROR_WANT_READ:
+ /*
+ * Returning 0 here causes caller to wait for write-ready,
+ * which is not really the right thing, but it's the best
+ * we can do.
+ */
+ n = 0;
+ break;
case SSL_ERROR_WANT_WRITE:
- /* XXX to support nonblock I/O, we should return 0 here */
- goto wloop;
+ n = 0;
+ break;
case SSL_ERROR_SYSCALL:
if (n == -1)
printfPQExpBuffer(&conn->errorMessage,
/*
* Attempt to negotiate SSL connection.
*/
-static int
+static PostgresPollingStatusType
open_client_SSL(PGconn *conn)
{
-#ifdef NOT_USED
int r;
-#endif
- if (!(conn->ssl = SSL_new(SSL_context)) ||
- !SSL_set_app_data(conn->ssl, conn) ||
- !SSL_set_fd(conn->ssl, conn->sock) ||
- SSL_connect(conn->ssl) <= 0)
+ r = SSL_connect(conn->ssl);
+ if (r <= 0)
{
- printfPQExpBuffer(&conn->errorMessage,
- libpq_gettext("could not establish SSL connection: %s\n"),
- SSLerrmessage());
- close_SSL(conn);
- return -1;
+ switch (SSL_get_error(conn->ssl, r))
+ {
+ case SSL_ERROR_WANT_READ:
+ return PGRES_POLLING_READING;
+
+ case SSL_ERROR_WANT_WRITE:
+ return PGRES_POLLING_WRITING;
+
+ case SSL_ERROR_SYSCALL:
+ if (r == -1)
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("SSL SYSCALL error: %s\n"),
+ SOCK_STRERROR(SOCK_ERRNO));
+ else
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("SSL SYSCALL error: EOF detected\n"));
+ close_SSL(conn);
+ return PGRES_POLLING_FAILED;
+
+ case SSL_ERROR_SSL:
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("SSL error: %s\n"), SSLerrmessage());
+ close_SSL(conn);
+ return PGRES_POLLING_FAILED;
+
+ default:
+ printfPQExpBuffer(&conn->errorMessage,
+ libpq_gettext("Unknown SSL error code\n"));
+ close_SSL(conn);
+ return PGRES_POLLING_FAILED;
+ }
}
/* check the certificate chain of the server */
libpq_gettext("certificate could not be validated: %s\n"),
X509_verify_cert_error_string(r));
close_SSL(conn);
- return -1;
+ return PGRES_POLLING_FAILED;
}
#endif
libpq_gettext("certificate could not be obtained: %s\n"),
SSLerrmessage());
close_SSL(conn);
- return -1;
+ return PGRES_POLLING_FAILED;
}
X509_NAME_oneline(X509_get_subject_name(conn->peer),
if (verify_peer(conn) == -1)
{
close_SSL(conn);
- return -1;
+ return PGRES_POLLING_FAILED;
}
#endif
- return 0;
+ /* SSL handshake is complete */
+ return PGRES_POLLING_OK;
}
/*
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: libpq-fe.h,v 1.92 2003/04/19 00:02:30 tgl Exp $
+ * $Id: libpq-fe.h,v 1.93 2003/06/08 17:43:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
typedef enum
{
/*
- * Although you may decide to change this list in some way, values
- * which become unused should never be removed, nor should constants
- * be redefined - that would break compatibility with existing code.
+ * Although it is okay to add to this list, values which become unused
+ * should never be removed, nor should constants be redefined - that would
+ * break compatibility with existing code.
*/
CONNECTION_OK,
CONNECTION_BAD,
* postmaster. */
CONNECTION_AUTH_OK, /* Received authentication; waiting for
* backend startup. */
- CONNECTION_SETENV /* Negotiating environment. */
+ CONNECTION_SETENV, /* Negotiating environment. */
+ CONNECTION_SSL_STARTUP, /* Negotiating SSL. */
+ CONNECTION_NEEDED /* Internal state: connect() needed */
} ConnStatusType;
typedef enum
typedef enum
{
- PGRES_EMPTY_QUERY = 0,
+ PGRES_EMPTY_QUERY = 0, /* empty query string was executed */
PGRES_COMMAND_OK, /* a query command that doesn't return
* anything was executed properly by the
* backend */
PGRES_COPY_IN, /* Copy In data transfer in progress */
PGRES_BAD_RESPONSE, /* an unexpected response was recv'd from
* the backend */
- PGRES_NONFATAL_ERROR,
- PGRES_FATAL_ERROR
+ PGRES_NONFATAL_ERROR, /* notice or warning message */
+ PGRES_FATAL_ERROR /* query failed */
} ExecStatusType;
/* PGconn encapsulates a connection to the backend.
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: libpq-int.h,v 1.70 2003/05/08 18:33:39 tgl Exp $
+ * $Id: libpq-int.h,v 1.71 2003/06/08 17:43:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
/* include stuff common to fe and be */
+#include "getaddrinfo.h"
#include "libpq/pqcomm.h"
#include "lib/dllist.h"
/* include stuff found in fe only */
#include <openssl/err.h>
#endif
-/* libpq supports this version of the frontend/backend protocol.
- *
- * NB: we used to use PG_PROTOCOL_LATEST from the backend pqcomm.h file,
- * but that's not really the right thing: just recompiling libpq
- * against a more recent backend isn't going to magically update it
- * for most sorts of protocol changes. So, when you change libpq
- * to support a different protocol revision, you have to change this
- * constant too. PG_PROTOCOL_EARLIEST and PG_PROTOCOL_LATEST in
- * pqcomm.h describe what the backend knows, not what libpq knows.
- */
-
-#define PG_PROTOCOL_LIBPQ PG_PROTOCOL(3,0)
-
/*
* POSTGRES backend dependent Constants.
*/
-
#define PQERRORMSG_LENGTH 1024
#define CMDSTATUS_LEN 40
int atttypmod; /* type-specific modifier info */
} PGresAttDesc;
-/* Data for a single attribute of a single tuple */
-
-/* We use char* for Attribute values.
- The value pointer always points to a null-terminated area; we add a
- null (zero) byte after whatever the backend sends us. This is only
- particularly useful for text tuples ... with a binary value, the
- value might have embedded nulls, so the application can't use C string
- operators on it. But we add a null anyway for consistency.
- Note that the value itself does not contain a length word.
-
- A NULL attribute is a special case in two ways: its len field is NULL_LEN
- and its value field points to null_field in the owning PGresult. All the
- NULL attributes in a query result point to the same place (there's no need
- to store a null string separately for each one).
+/*
+ * Data for a single attribute of a single tuple
+ *
+ * We use char* for Attribute values.
+ *
+ * The value pointer always points to a null-terminated area; we add a
+ * null (zero) byte after whatever the backend sends us. This is only
+ * particularly useful for text tuples ... with a binary value, the
+ * value might have embedded nulls, so the application can't use C string
+ * operators on it. But we add a null anyway for consistency.
+ * Note that the value itself does not contain a length word.
+ *
+ * A NULL attribute is a special case in two ways: its len field is NULL_LEN
+ * and its value field points to null_field in the owning PGresult. All the
+ * NULL attributes in a query result point to the same place (there's no need
+ * to store a null string separately for each one).
*/
#define NULL_LEN (-1) /* pg_result len for NULL value */
* otherwise text */
/*
- * The conn link in PGresult is no longer used by any libpq code. It
- * should be removed entirely, because it could be a dangling link
- * (the application could keep the PGresult around longer than it
- * keeps the PGconn!) But there may be apps out there that depend on
- * it, so we will leave it here at least for a release or so.
- */
- PGconn *xconn; /* connection we did the query on, if any */
-
- /*
* These fields are copied from the originating PGconn, so that
* operations on the PGresult don't have to reference the PGconn.
*/
PGASYNC_COPY_OUT /* Copy Out data transfer in progress */
} PGAsyncStatusType;
+/* PGSetenvStatusType defines the state of the PQSetenv state machine */
+/* (this is used only for 2.0-protocol connections) */
+typedef enum
+{
+ SETENV_STATE_OPTION_SEND, /* About to send an Environment Option */
+ SETENV_STATE_OPTION_WAIT, /* Waiting for above send to complete */
+ SETENV_STATE_QUERY1_SEND, /* About to send a status query */
+ SETENV_STATE_QUERY1_WAIT, /* Waiting for query to complete */
+ SETENV_STATE_QUERY2_SEND, /* About to send a status query */
+ SETENV_STATE_QUERY2_WAIT, /* Waiting for query to complete */
+ SETENV_STATE_IDLE
+} PGSetenvStatusType;
+
+/* Typedef for the EnvironmentOptions[] array */
+typedef struct PQEnvironmentOption
+{
+ const char *envName, /* name of an environment variable */
+ *pgName; /* name of corresponding SET variable */
+} PQEnvironmentOption;
+
+/* Typedef for parameter-status list entries */
+typedef struct pgParameterStatus
+{
+ struct pgParameterStatus *next; /* list link */
+ char *name; /* parameter name */
+ char *value; /* parameter value */
+ /* Note: name and value are stored in same malloc block as struct is */
+} pgParameterStatus;
+
/* large-object-access data ... allocated only if large-object code is used. */
typedef struct pgLobjfuncs
{
Oid fn_lo_write; /* OID of backend function LOwrite */
} PGlobjfuncs;
-/* PGconn stores all the state data associated with a single connection
+/*
+ * PGconn stores all the state data associated with a single connection
* to a backend.
*/
struct pg_conn
SockAddr laddr; /* Local address */
SockAddr raddr; /* Remote address */
int raddr_len; /* Length of remote address */
+ ProtocolVersion pversion; /* FE/BE protocol version in use */
+ char sversion[8]; /* The first few bytes of server version */
+
+ /* Transient state needed while establishing connection */
+ struct addrinfo *addrlist; /* list of possible backend addresses */
+ struct addrinfo *addr_cur; /* the one currently being tried */
+ PGSetenvStatusType setenv_state; /* for 2.0 protocol only */
+ const PQEnvironmentOption *next_eo;
/* Miscellaneous stuff */
int be_pid; /* PID of backend --- needed for cancels */
int be_key; /* key of backend --- needed for cancels */
char md5Salt[4]; /* password salt received from backend */
char cryptSalt[2]; /* password salt received from backend */
+ pgParameterStatus *pstatus; /* ParameterStatus data */
int client_encoding; /* encoding id */
PGlobjfuncs *lobjfuncs; /* private state for large-object access
* fns */
int outCount; /* number of chars waiting in buffer */
/* State for constructing messages in outBuffer */
- int outMsgStart; /* offset to msg start (length word) */
+ int outMsgStart; /* offset to msg start (length word);
+ * if -1, msg has no length word */
int outMsgEnd; /* offset to msg end (so far) */
/* Status for asynchronous result construction */
/* === in fe-exec.c === */
extern void pqSetResultError(PGresult *res, const char *msg);
+extern void pqCatenateResultError(PGresult *res, const char *msg);
extern void *pqResultAlloc(PGresult *res, size_t nBytes, bool isBinary);
extern char *pqResultStrdup(PGresult *res, const char *str);
extern void pqClearAsyncResult(PGconn *conn);
-extern int pqGetErrorNotice(PGconn *conn, bool isError);
+extern void pqSaveErrorResult(PGconn *conn);
+extern PGresult *pqPrepareAsyncResult(PGconn *conn);
+extern int pqAddTuple(PGresult *res, PGresAttValue *tup);
+extern void pqSaveParameterStatus(PGconn *conn, const char *name,
+ const char *value);
+extern const char *pqGetParameterStatus(PGconn *conn, const char *name);
+extern void pqHandleSendFailure(PGconn *conn);
+
+/* === in fe-protocol2.c === */
+
+extern PostgresPollingStatusType pqSetenvPoll(PGconn *conn);
+
+extern char *pqBuildStartupPacket2(PGconn *conn, int *packetlen,
+ const PQEnvironmentOption *options);
+extern void pqParseInput2(PGconn *conn);
+extern int pqGetline2(PGconn *conn, char *s, int maxlen);
+extern int pqGetlineAsync2(PGconn *conn, char *buffer, int bufsize);
+extern int pqEndcopy2(PGconn *conn);
+extern PGresult *pqFunctionCall2(PGconn *conn, Oid fnid,
+ int *result_buf, int *actual_result_len,
+ int result_is_int,
+ const PQArgBlock *args, int nargs);
+
+/* === in fe-protocol3.c === */
+
+extern char *pqBuildStartupPacket3(PGconn *conn, int *packetlen,
+ const PQEnvironmentOption *options);
+extern void pqParseInput3(PGconn *conn);
+extern int pqGetErrorNotice3(PGconn *conn, bool isError);
+extern int pqGetline3(PGconn *conn, char *s, int maxlen);
+extern int pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize);
+extern int pqEndcopy3(PGconn *conn);
+extern PGresult *pqFunctionCall3(PGconn *conn, Oid fnid,
+ int *result_buf, int *actual_result_len,
+ int result_is_int,
+ const PQArgBlock *args, int nargs);
/* === in fe-misc.c === */
extern int pqPutnchar(const char *s, size_t len, PGconn *conn);
extern int pqGetInt(int *result, size_t bytes, PGconn *conn);
extern int pqPutInt(int value, size_t bytes, PGconn *conn);
-extern int pqPutMsgStart(char msg_type, PGconn *conn);
+extern int pqPutMsgStart(char msg_type, bool force_len, PGconn *conn);
extern int pqPutMsgEnd(PGconn *conn);
extern int pqReadData(PGconn *conn);
extern int pqFlush(PGconn *conn);
extern int pqsecure_initialize(PGconn *);
extern void pqsecure_destroy(void);
-extern int pqsecure_open_client(PGconn *);
+extern PostgresPollingStatusType pqsecure_open_client(PGconn *);
extern void pqsecure_close(PGconn *);
extern ssize_t pqsecure_read(PGconn *, void *ptr, size_t len);
extern ssize_t pqsecure_write(PGconn *, const void *ptr, size_t len);
-/* bits in a byte */
-#define BYTELEN 8
-
-/* fall back options if they are not specified by arguments or defined
- by environment variables */
-#define DefaultHost "localhost"
-#define DefaultTty ""
-#define DefaultOption ""
-#define DefaultAuthtype ""
-#define DefaultPassword ""
+/* Note: PGDONOTICE macro will work if applied to either PGconn or PGresult */
+#define PGDONOTICE(conn,message) \
+ ((*(conn)->noticeHook) ((conn)->noticeArg, (message)))
/*
* this is so that we can check is a connection is non-blocking internally
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