-/* Serial interface for raw TCP connections on Un*x like systems
- Copyright 1992, 1993, 1998 Free Software Foundation, Inc.
+/* Serial interface for raw TCP connections on Un*x like systems.
-This file is part of GDB.
+ Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2005, 2006,
+ 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This file is part of GDB.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "serial.h"
+#include "ser-base.h"
+#include "ser-tcp.h"
+#include "gdbcmd.h"
+#include "cli/cli-decode.h"
+#include "cli/cli-setshow.h"
+
#include <sys/types.h>
+
+#ifdef HAVE_SYS_FILIO_H
+#include <sys/filio.h> /* For FIONBIO. */
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h> /* For FIONBIO. */
+#endif
+
#include <sys/time.h>
+
+#ifdef USE_WIN32API
+#include <winsock2.h>
+#define ETIMEDOUT WSAETIMEDOUT
+#define close(fd) closesocket (fd)
+#define ioctl ioctlsocket
+#else
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
-
-#ifndef __CYGWIN32__
#include <netinet/tcp.h>
#endif
-#include "signals.h"
+#include <signal.h>
#include "gdb_string.h"
+#include "gdb_select.h"
-struct tcp_ttystate
-{
- int bogus;
-};
-
-static int tcp_open PARAMS ((serial_t scb, const char *name));
-static void tcp_raw PARAMS ((serial_t scb));
-static int wait_for PARAMS ((serial_t scb, int timeout));
-static int tcp_readchar PARAMS ((serial_t scb, int timeout));
-static int tcp_setbaudrate PARAMS ((serial_t scb, int rate));
-static int tcp_setstopbits PARAMS ((serial_t scb, int num));
-static int tcp_write PARAMS ((serial_t scb, const char *str, int len));
-/* FIXME: static void tcp_restore PARAMS ((serial_t scb)); */
-static void tcp_close PARAMS ((serial_t scb));
-static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb));
-static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
-static int tcp_return_0 PARAMS ((serial_t));
-static int tcp_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate,
- serial_ttystate));
-static void tcp_print_tty_state PARAMS ((serial_t, serial_ttystate));
-
-void _initialize_ser_tcp PARAMS ((void));
-
-/* Open up a raw tcp socket */
-
-static int
-tcp_open(scb, name)
- serial_t scb;
- const char *name;
-{
- char *port_str;
- int port;
- struct hostent *hostent;
- struct sockaddr_in sockaddr;
- int tmp;
- char hostname[100];
- struct protoent *protoent;
- int i;
-
- port_str = strchr (name, ':');
-
- if (!port_str)
- error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
-
- tmp = min (port_str - name, (int) sizeof hostname - 1);
- strncpy (hostname, name, tmp); /* Don't want colon */
- hostname[tmp] = '\000'; /* Tie off host name */
- port = atoi (port_str + 1);
-
- hostent = gethostbyname (hostname);
-
- if (!hostent)
- {
- fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
- errno = ENOENT;
- return -1;
- }
-
- for (i = 1; i <= 15; i++)
- {
- scb->fd = socket (PF_INET, SOCK_STREAM, 0);
- if (scb->fd < 0)
- return -1;
+#ifndef HAVE_SOCKLEN_T
+typedef int socklen_t;
+#endif
- /* Allow rapid reuse of this port. */
- tmp = 1;
- setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp));
+void _initialize_ser_tcp (void);
- /* Enable TCP keep alive process. */
- tmp = 1;
- setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp));
+/* For "set tcp" and "show tcp". */
- sockaddr.sin_family = PF_INET;
- sockaddr.sin_port = htons(port);
- memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
- sizeof (struct in_addr));
+static struct cmd_list_element *tcp_set_cmdlist;
+static struct cmd_list_element *tcp_show_cmdlist;
- if (!connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)))
- break;
+/* Whether to auto-retry refused connections. */
- close (scb->fd);
- scb->fd = -1;
+static int tcp_auto_retry = 1;
-/* We retry for ECONNREFUSED because that is often a temporary condition, which
- happens when the server is being restarted. */
+/* Timeout period for connections, in seconds. */
- if (errno != ECONNREFUSED)
- return -1;
+static int tcp_retry_limit = 15;
- sleep (1);
- }
+/* How many times per second to poll deprecated_ui_loop_hook. */
- protoent = getprotobyname ("tcp");
- if (!protoent)
- return -1;
-
- tmp = 1;
- if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
- (char *)&tmp, sizeof(tmp)))
- return -1;
+#define POLL_INTERVAL 5
- signal(SIGPIPE, SIG_IGN); /* If we don't do this, then GDB simply exits
- when the remote side dies. */
+/* Helper function to wait a while. If SCB is non-null, wait on its
+ file descriptor. Otherwise just wait on a timeout, updating *POLLS.
+ Returns -1 on timeout or interrupt, otherwise the value of select. */
- return 0;
-}
-
-static serial_ttystate
-tcp_get_tty_state(scb)
- serial_t scb;
+static int
+wait_for_connect (struct serial *scb, int *polls)
{
- struct tcp_ttystate *state;
+ struct timeval t;
+ int n;
- state = (struct tcp_ttystate *)xmalloc(sizeof *state);
-
- return (serial_ttystate)state;
-}
+ /* While we wait for the connect to complete,
+ poll the UI so it can update or the user can
+ interrupt. */
+ if (deprecated_ui_loop_hook && deprecated_ui_loop_hook (0))
+ {
+ errno = EINTR;
+ return -1;
+ }
-static int
-tcp_set_tty_state(scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
-{
- struct tcp_ttystate *state;
+ /* Check for timeout. */
+ if (*polls > tcp_retry_limit * POLL_INTERVAL)
+ {
+ errno = ETIMEDOUT;
+ return -1;
+ }
- state = (struct tcp_ttystate *)ttystate;
+ /* Back off to polling once per second after the first POLL_INTERVAL
+ polls. */
+ if (*polls < POLL_INTERVAL)
+ {
+ t.tv_sec = 0;
+ t.tv_usec = 1000000 / POLL_INTERVAL;
+ }
+ else
+ {
+ t.tv_sec = 1;
+ t.tv_usec = 0;
+ }
- return 0;
+ if (scb)
+ {
+ fd_set rset, wset, eset;
+
+ FD_ZERO (&rset);
+ FD_SET (scb->fd, &rset);
+ wset = rset;
+ eset = rset;
+
+ /* POSIX systems return connection success or failure by signalling
+ wset. Windows systems return success in wset and failure in
+ eset.
+
+ We must call select here, rather than gdb_select, because
+ the serial structure has not yet been initialized - the
+ MinGW select wrapper will not know that this FD refers
+ to a socket. */
+ n = select (scb->fd + 1, &rset, &wset, &eset, &t);
+ }
+ else
+ /* Use gdb_select here, since we have no file descriptors, and on
+ Windows, plain select doesn't work in that case. */
+ n = gdb_select (0, NULL, NULL, NULL, &t);
+
+ /* If we didn't time out, only count it as one poll. */
+ if (n > 0 || *polls < POLL_INTERVAL)
+ (*polls)++;
+ else
+ (*polls) += POLL_INTERVAL;
+
+ return n;
}
-static int
-tcp_return_0 (scb)
- serial_t scb;
-{
- return 0;
-}
+/* Open a tcp socket. */
-static void
-tcp_raw(scb)
- serial_t scb;
+int
+net_open (struct serial *scb, const char *name)
{
- return; /* Always in raw mode */
-}
-
-/* Wait for input on scb, with timeout seconds. Returns 0 on success,
- otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
+ char *port_str, hostname[100];
+ int n, port, tmp;
+ int use_udp;
+ struct hostent *hostent;
+ struct sockaddr_in sockaddr;
+#ifdef USE_WIN32API
+ u_long ioarg;
+#else
+ int ioarg;
+#endif
+ int polls = 0;
- For termio{s}, we actually just setup VTIME if necessary, and let the
- timeout occur in the read() in tcp_read().
- */
+ use_udp = 0;
+ if (strncmp (name, "udp:", 4) == 0)
+ {
+ use_udp = 1;
+ name = name + 4;
+ }
+ else if (strncmp (name, "tcp:", 4) == 0)
+ name = name + 4;
-static int
-wait_for (scb, timeout)
- serial_t scb;
- int timeout;
-{
- int numfds;
- struct timeval tv;
- fd_set readfds, exceptfds;
+ port_str = strchr (name, ':');
- FD_ZERO (&readfds);
- FD_ZERO (&exceptfds);
+ if (!port_str)
+ error (_("net_open: No colon in host name!")); /* Shouldn't ever
+ happen. */
- tv.tv_sec = timeout;
- tv.tv_usec = 0;
+ tmp = min (port_str - name, (int) sizeof hostname - 1);
+ strncpy (hostname, name, tmp); /* Don't want colon. */
+ hostname[tmp] = '\000'; /* Tie off host name. */
+ port = atoi (port_str + 1);
- FD_SET(scb->fd, &readfds);
- FD_SET(scb->fd, &exceptfds);
+ /* Default hostname is localhost. */
+ if (!hostname[0])
+ strcpy (hostname, "localhost");
- while (1)
+ hostent = gethostbyname (hostname);
+ if (!hostent)
{
- if (timeout >= 0)
- numfds = select(scb->fd+1, &readfds, 0, &exceptfds, &tv);
- else
- numfds = select(scb->fd+1, &readfds, 0, &exceptfds, 0);
-
- if (numfds <= 0)
- {
- if (numfds == 0)
- return SERIAL_TIMEOUT;
- else if (errno == EINTR)
- continue;
- else
- return SERIAL_ERROR; /* Got an error from select or poll */
- }
-
- return 0;
+ fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
+ errno = ENOENT;
+ return -1;
}
-}
-/* Read a character with user-specified timeout. TIMEOUT is number of seconds
- to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
- char if successful. Returns -2 if timeout expired, EOF if line dropped
- dead, or -3 for any other error (see errno in that case). */
+ sockaddr.sin_family = PF_INET;
+ sockaddr.sin_port = htons (port);
+ memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
+ sizeof (struct in_addr));
-static int
-tcp_readchar (scb, timeout)
- serial_t scb;
- int timeout;
-{
- int status;
+ retry:
- if (scb->bufcnt-- > 0)
- return *scb->bufp++;
+ if (use_udp)
+ scb->fd = socket (PF_INET, SOCK_DGRAM, 0);
+ else
+ scb->fd = socket (PF_INET, SOCK_STREAM, 0);
- status = wait_for(scb, timeout);
+ if (scb->fd == -1)
+ return -1;
+
+ /* Set socket nonblocking. */
+ ioarg = 1;
+ ioctl (scb->fd, FIONBIO, &ioarg);
- if (status < 0)
- return status;
+ /* Use Non-blocking connect. connect() will return 0 if connected
+ already. */
+ n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr));
- while (1)
+ if (n < 0)
{
- scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
- if (scb->bufcnt != -1 || errno != EINTR)
- break;
+#ifdef USE_WIN32API
+ int err = WSAGetLastError();
+#else
+ int err = errno;
+#endif
+
+ /* Maybe we're waiting for the remote target to become ready to
+ accept connections. */
+ if (tcp_auto_retry
+#ifdef USE_WIN32API
+ && err == WSAECONNREFUSED
+#else
+ && err == ECONNREFUSED
+#endif
+ && wait_for_connect (NULL, &polls) >= 0)
+ {
+ close (scb->fd);
+ goto retry;
+ }
+
+ if (
+#ifdef USE_WIN32API
+ /* Under Windows, calling "connect" with a non-blocking socket
+ results in WSAEWOULDBLOCK, not WSAEINPROGRESS. */
+ err != WSAEWOULDBLOCK
+#else
+ err != EINPROGRESS
+#endif
+ )
+ {
+ errno = err;
+ net_close (scb);
+ return -1;
+ }
+
+ /* Looks like we need to wait for the connect. */
+ do
+ {
+ n = wait_for_connect (scb, &polls);
+ }
+ while (n == 0);
+ if (n < 0)
+ {
+ net_close (scb);
+ return -1;
+ }
}
- if (scb->bufcnt <= 0)
+ /* Got something. Is it an error? */
+ {
+ int res, err;
+ socklen_t len;
+
+ len = sizeof (err);
+ /* On Windows, the fourth parameter to getsockopt is a "char *";
+ on UNIX systems it is generally "void *". The cast to "void *"
+ is OK everywhere, since in C "void *" can be implicitly
+ converted to any pointer type. */
+ res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len);
+ if (res < 0 || err)
+ {
+ /* Maybe the target still isn't ready to accept the connection. */
+ if (tcp_auto_retry
+#ifdef USE_WIN32API
+ && err == WSAECONNREFUSED
+#else
+ && err == ECONNREFUSED
+#endif
+ && wait_for_connect (NULL, &polls) >= 0)
+ {
+ close (scb->fd);
+ goto retry;
+ }
+ if (err)
+ errno = err;
+ net_close (scb);
+ return -1;
+ }
+ }
+
+ /* Turn off nonblocking. */
+ ioarg = 0;
+ ioctl (scb->fd, FIONBIO, &ioarg);
+
+ if (use_udp == 0)
{
- if (scb->bufcnt == 0)
- return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
- distinguish between EOF & timeouts
- someday] */
- else
- return SERIAL_ERROR; /* Got an error from read */
+ /* Disable Nagle algorithm. Needed in some cases. */
+ tmp = 1;
+ setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY,
+ (char *)&tmp, sizeof (tmp));
}
- scb->bufcnt--;
- scb->bufp = scb->buf;
- return *scb->bufp++;
-}
+#ifdef SIGPIPE
+ /* If we don't do this, then GDB simply exits
+ when the remote side dies. */
+ signal (SIGPIPE, SIG_IGN);
+#endif
-static int
-tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
- serial_t scb;
- serial_ttystate new_ttystate;
- serial_ttystate old_ttystate;
-{
return 0;
}
-static void
-tcp_print_tty_state (scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
+void
+net_close (struct serial *scb)
{
- /* Nothing to print. */
- return;
+ if (scb->fd == -1)
+ return;
+
+ close (scb->fd);
+ scb->fd = -1;
}
-static int
-tcp_setbaudrate(scb, rate)
- serial_t scb;
- int rate;
+int
+net_read_prim (struct serial *scb, size_t count)
{
- return 0; /* Never fails! */
+ return recv (scb->fd, scb->buf, count, 0);
}
-static int
-tcp_setstopbits(scb, num)
- serial_t scb;
- int num;
+int
+net_write_prim (struct serial *scb, const void *buf, size_t count)
{
- return 0; /* Never fails! */
+ return send (scb->fd, buf, count, 0);
}
-static int
-tcp_write(scb, str, len)
- serial_t scb;
- const char *str;
- int len;
+int
+ser_tcp_send_break (struct serial *scb)
{
- int cc;
+ /* Send telnet IAC and BREAK characters. */
+ return (serial_write (scb, "\377\363", 2));
+}
- while (len > 0)
- {
- cc = write(scb->fd, str, len);
+/* Support for "set tcp" and "show tcp" commands. */
- if (cc < 0)
- return 1;
- len -= cc;
- str += cc;
- }
- return 0;
+static void
+set_tcp_cmd (char *args, int from_tty)
+{
+ help_list (tcp_set_cmdlist, "set tcp ", -1, gdb_stdout);
}
static void
-tcp_close(scb)
- serial_t scb;
+show_tcp_cmd (char *args, int from_tty)
{
- if (scb->fd < 0)
- return;
-
- close(scb->fd);
- scb->fd = -1;
+ help_list (tcp_show_cmdlist, "show tcp ", -1, gdb_stdout);
}
-static struct serial_ops tcp_ops =
-{
- "tcp",
- 0,
- tcp_open,
- tcp_close,
- tcp_readchar,
- tcp_write,
- tcp_return_0, /* flush output */
- tcp_return_0, /* flush input */
- tcp_return_0, /* send break */
- tcp_raw,
- tcp_get_tty_state,
- tcp_set_tty_state,
- tcp_print_tty_state,
- tcp_noflush_set_tty_state,
- tcp_setbaudrate,
- tcp_setstopbits,
- tcp_return_0, /* wait for output to drain */
-};
void
-_initialize_ser_tcp ()
+_initialize_ser_tcp (void)
{
- serial_add_interface (&tcp_ops);
+#ifdef USE_WIN32API
+ /* Do nothing; the TCP serial operations will be initialized in
+ ser-mingw.c. */
+#else
+ struct serial_ops *ops;
+
+ ops = XMALLOC (struct serial_ops);
+ memset (ops, 0, sizeof (struct serial_ops));
+ ops->name = "tcp";
+ ops->next = 0;
+ ops->open = net_open;
+ ops->close = net_close;
+ ops->readchar = ser_base_readchar;
+ ops->write = ser_base_write;
+ ops->flush_output = ser_base_flush_output;
+ ops->flush_input = ser_base_flush_input;
+ ops->send_break = ser_tcp_send_break;
+ ops->go_raw = ser_base_raw;
+ ops->get_tty_state = ser_base_get_tty_state;
+ ops->copy_tty_state = ser_base_copy_tty_state;
+ ops->set_tty_state = ser_base_set_tty_state;
+ ops->print_tty_state = ser_base_print_tty_state;
+ ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
+ ops->setbaudrate = ser_base_setbaudrate;
+ ops->setstopbits = ser_base_setstopbits;
+ ops->drain_output = ser_base_drain_output;
+ ops->async = ser_base_async;
+ ops->read_prim = net_read_prim;
+ ops->write_prim = net_write_prim;
+ serial_add_interface (ops);
+#endif /* USE_WIN32API */
+
+ add_prefix_cmd ("tcp", class_maintenance, set_tcp_cmd, _("\
+TCP protocol specific variables\n\
+Configure variables specific to remote TCP connections"),
+ &tcp_set_cmdlist, "set tcp ",
+ 0 /* allow-unknown */, &setlist);
+ add_prefix_cmd ("tcp", class_maintenance, show_tcp_cmd, _("\
+TCP protocol specific variables\n\
+Configure variables specific to remote TCP connections"),
+ &tcp_show_cmdlist, "show tcp ",
+ 0 /* allow-unknown */, &showlist);
+
+ add_setshow_boolean_cmd ("auto-retry", class_obscure,
+ &tcp_auto_retry, _("\
+Set auto-retry on socket connect"), _("\
+Show auto-retry on socket connect"),
+ NULL, NULL, NULL,
+ &tcp_set_cmdlist, &tcp_show_cmdlist);
+
+ add_setshow_uinteger_cmd ("connect-timeout", class_obscure,
+ &tcp_retry_limit, _("\
+Set timeout limit for socket connection"), _("\
+Show timeout limit for socket connection"),
+ NULL, NULL, NULL,
+ &tcp_set_cmdlist, &tcp_show_cmdlist);
}
OSDN Git Service
