1 /* @(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC */
3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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31 static char sccsid[] = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro";
35 * clnt_tcp.c, Implements a TCP/IP based, client side RPC.
37 * Copyright (C) 1984, Sun Microsystems, Inc.
39 * TCP based RPC supports 'batched calls'.
40 * A sequence of calls may be batched-up in a send buffer. The rpc call
41 * return immediately to the client even though the call was not necessarily
42 * sent. The batching occurs if the results' xdr routine is NULL (0) AND
43 * the rpc timeout value is zero (see clnt.h, rpc).
45 * Clients should NOT casually batch calls that in fact return results; that is,
46 * the server side should be aware that a call is batched and not produce any
47 * return message. Batched calls that produce many result messages can
48 * deadlock (netlock) the client and the server....
50 * Now go hang yourself.
53 #define authnone_create __authnone_create
54 #define xdrrec_create __xdrrec_create
55 #define xdrmem_create __xdrmem_create
66 #include <sys/socket.h>
67 #include <rpc/pmap_clnt.h>
72 extern u_long _create_xid (void) attribute_hidden;
74 #define MCALL_MSG_SIZE 24
80 struct timeval ct_wait;
81 bool_t ct_waitset; /* wait set by clnt_control? */
82 struct sockaddr_in ct_addr;
83 struct rpc_err ct_error;
84 char ct_mcall[MCALL_MSG_SIZE]; /* marshalled callmsg */
85 u_int ct_mpos; /* pos after marshal */
89 static int readtcp (char *, char *, int);
90 static int writetcp (char *, char *, int);
92 static enum clnt_stat clnttcp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
93 xdrproc_t, caddr_t, struct timeval);
94 static void clnttcp_abort (void);
95 static void clnttcp_geterr (CLIENT *, struct rpc_err *);
96 static bool_t clnttcp_freeres (CLIENT *, xdrproc_t, caddr_t);
97 static bool_t clnttcp_control (CLIENT *, int, char *);
98 static void clnttcp_destroy (CLIENT *);
100 static struct clnt_ops tcp_ops =
111 * Create a client handle for a tcp/ip connection.
112 * If *sockp<0, *sockp is set to a newly created TCP socket and it is
113 * connected to raddr. If *sockp non-negative then
114 * raddr is ignored. The rpc/tcp package does buffering
115 * similar to stdio, so the client must pick send and receive buffer sizes,];
116 * 0 => use the default.
117 * If raddr->sin_port is 0, then a binder on the remote machine is
118 * consulted for the right port number.
119 * NB: *sockp is copied into a private area.
120 * NB: It is the clients responsibility to close *sockp.
121 * NB: The rpch->cl_auth is set null authentication. Caller may wish to set this
122 * something more useful.
125 clnttcp_create (struct sockaddr_in *raddr, u_long prog, u_long vers,
126 int *sockp, u_int sendsz, u_int recvsz)
130 struct rpc_msg call_msg;
132 h = (CLIENT *) mem_alloc (sizeof (*h));
133 ct = (struct ct_data *) mem_alloc (sizeof (*ct));
134 if (h == NULL || ct == NULL)
136 struct rpc_createerr *ce = &get_rpc_createerr ();
138 if (_IO_fwide (stderr, 0) > 0)
139 (void) __fwprintf (stderr, L"%s",
140 _("clnttcp_create: out of memory\n"));
143 (void) fputs (_("clnttcp_create: out of memory\n"), stderr);
144 ce->cf_stat = RPC_SYSTEMERROR;
145 ce->cf_error.re_errno = ENOMEM;
150 * If no port number given ask the pmap for one
152 if (raddr->sin_port == 0)
155 if ((port = pmap_getport (raddr, prog, vers, IPPROTO_TCP)) == 0)
157 mem_free ((caddr_t) ct, sizeof (struct ct_data));
158 mem_free ((caddr_t) h, sizeof (CLIENT));
159 return ((CLIENT *) NULL);
161 raddr->sin_port = htons (port);
165 * If no socket given, open one
169 *sockp = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
170 (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
172 || (connect (*sockp, (struct sockaddr *) raddr,
173 sizeof (*raddr)) < 0))
175 struct rpc_createerr *ce = &get_rpc_createerr ();
176 ce->cf_stat = RPC_SYSTEMERROR;
177 ce->cf_error.re_errno = errno;
179 (void) __close (*sockp);
182 ct->ct_closeit = TRUE;
186 ct->ct_closeit = FALSE;
190 * Set up private data struct
192 ct->ct_sock = *sockp;
193 ct->ct_wait.tv_usec = 0;
194 ct->ct_waitset = FALSE;
195 ct->ct_addr = *raddr;
198 * Initialize call message
200 call_msg.rm_xid = _create_xid ();
201 call_msg.rm_direction = CALL;
202 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
203 call_msg.rm_call.cb_prog = prog;
204 call_msg.rm_call.cb_vers = vers;
207 * pre-serialize the static part of the call msg and stash it away
209 xdrmem_create (&(ct->ct_xdrs), ct->ct_mcall, MCALL_MSG_SIZE,
211 if (!xdr_callhdr (&(ct->ct_xdrs), &call_msg))
215 (void) __close (*sockp);
219 ct->ct_mpos = XDR_GETPOS (&(ct->ct_xdrs));
220 XDR_DESTROY (&(ct->ct_xdrs));
223 * Create a client handle which uses xdrrec for serialization
224 * and authnone for authentication.
226 xdrrec_create (&(ct->ct_xdrs), sendsz, recvsz,
227 (caddr_t) ct, readtcp, writetcp);
228 h->cl_ops = &tcp_ops;
229 h->cl_private = (caddr_t) ct;
230 h->cl_auth = authnone_create ();
235 * Something goofed, free stuff and barf
237 mem_free ((caddr_t) ct, sizeof (struct ct_data));
238 mem_free ((caddr_t) h, sizeof (CLIENT));
239 return ((CLIENT *) NULL);
242 static enum clnt_stat
243 clnttcp_call (h, proc, xdr_args, args_ptr, xdr_results, results_ptr, timeout)
248 xdrproc_t xdr_results;
250 struct timeval timeout;
252 struct ct_data *ct = (struct ct_data *) h->cl_private;
253 XDR *xdrs = &(ct->ct_xdrs);
254 struct rpc_msg reply_msg;
256 u_int32_t *msg_x_id = (u_int32_t *) (ct->ct_mcall); /* yuk */
262 ct->ct_wait = timeout;
266 (xdr_results == (xdrproc_t) 0 && ct->ct_wait.tv_sec == 0
267 && ct->ct_wait.tv_usec == 0) ? FALSE : TRUE;
270 xdrs->x_op = XDR_ENCODE;
271 ct->ct_error.re_status = RPC_SUCCESS;
272 x_id = ntohl (--(*msg_x_id));
273 if ((!XDR_PUTBYTES (xdrs, ct->ct_mcall, ct->ct_mpos)) ||
274 (!XDR_PUTLONG (xdrs, (long *) &proc)) ||
275 (!AUTH_MARSHALL (h->cl_auth, xdrs)) ||
276 (!(*xdr_args) (xdrs, args_ptr)))
278 if (ct->ct_error.re_status == RPC_SUCCESS)
279 ct->ct_error.re_status = RPC_CANTENCODEARGS;
280 (void) xdrrec_endofrecord (xdrs, TRUE);
281 return (ct->ct_error.re_status);
283 if (!xdrrec_endofrecord (xdrs, shipnow))
284 return ct->ct_error.re_status = RPC_CANTSEND;
288 * Hack to provide rpc-based message passing
290 if (ct->ct_wait.tv_sec == 0 && ct->ct_wait.tv_usec == 0)
292 return ct->ct_error.re_status = RPC_TIMEDOUT;
297 * Keep receiving until we get a valid transaction id
299 xdrs->x_op = XDR_DECODE;
302 reply_msg.acpted_rply.ar_verf = _null_auth;
303 reply_msg.acpted_rply.ar_results.where = NULL;
304 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
305 if (!xdrrec_skiprecord (xdrs))
306 return (ct->ct_error.re_status);
307 /* now decode and validate the response header */
308 if (!xdr_replymsg (xdrs, &reply_msg))
310 if (ct->ct_error.re_status == RPC_SUCCESS)
312 return ct->ct_error.re_status;
314 if ((u_int32_t) reply_msg.rm_xid == (u_int32_t) x_id)
321 _seterr_reply (&reply_msg, &(ct->ct_error));
322 if (ct->ct_error.re_status == RPC_SUCCESS)
324 if (!AUTH_VALIDATE (h->cl_auth, &reply_msg.acpted_rply.ar_verf))
326 ct->ct_error.re_status = RPC_AUTHERROR;
327 ct->ct_error.re_why = AUTH_INVALIDRESP;
329 else if (!(*xdr_results) (xdrs, results_ptr))
331 if (ct->ct_error.re_status == RPC_SUCCESS)
332 ct->ct_error.re_status = RPC_CANTDECODERES;
334 /* free verifier ... */
335 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
337 xdrs->x_op = XDR_FREE;
338 (void) xdr_opaque_auth (xdrs, &(reply_msg.acpted_rply.ar_verf));
340 } /* end successful completion */
343 /* maybe our credentials need to be refreshed ... */
344 if (refreshes-- && AUTH_REFRESH (h->cl_auth))
346 } /* end of unsuccessful completion */
347 return ct->ct_error.re_status;
351 clnttcp_geterr (h, errp)
353 struct rpc_err *errp;
356 (struct ct_data *) h->cl_private;
358 *errp = ct->ct_error;
362 clnttcp_freeres (cl, xdr_res, res_ptr)
367 struct ct_data *ct = (struct ct_data *) cl->cl_private;
368 XDR *xdrs = &(ct->ct_xdrs);
370 xdrs->x_op = XDR_FREE;
371 return (*xdr_res) (xdrs, res_ptr);
380 clnttcp_control (CLIENT *cl, int request, char *info)
382 struct ct_data *ct = (struct ct_data *) cl->cl_private;
388 ct->ct_closeit = TRUE;
390 case CLSET_FD_NCLOSE:
391 ct->ct_closeit = FALSE;
394 ct->ct_wait = *(struct timeval *) info;
395 ct->ct_waitset = TRUE;
398 *(struct timeval *) info = ct->ct_wait;
400 case CLGET_SERVER_ADDR:
401 *(struct sockaddr_in *) info = ct->ct_addr;
404 *(int *)info = ct->ct_sock;
408 * use the knowledge that xid is the
409 * first element in the call structure *.
410 * This will get the xid of the PREVIOUS call
412 *(u_long *)info = ntohl (*(u_long *)ct->ct_mcall);
415 /* This will set the xid of the NEXT call */
416 *(u_long *)ct->ct_mcall = htonl (*(u_long *)info - 1);
417 /* decrement by 1 as clnttcp_call() increments once */
420 * This RELIES on the information that, in the call body,
421 * the version number field is the fifth field from the
422 * begining of the RPC header. MUST be changed if the
423 * call_struct is changed
425 *(u_long *)info = ntohl (*(u_long *)(ct->ct_mcall +
426 4 * BYTES_PER_XDR_UNIT));
429 *(u_long *)(ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT)
430 = htonl (*(u_long *)info);
434 * This RELIES on the information that, in the call body,
435 * the program number field is the field from the
436 * begining of the RPC header. MUST be changed if the
437 * call_struct is changed
439 *(u_long *)info = ntohl(*(u_long *)(ct->ct_mcall +
440 3 * BYTES_PER_XDR_UNIT));
443 *(u_long *)(ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT)
444 = htonl(*(u_long *)info);
446 /* The following are only possible with TI-RPC */
447 case CLGET_RETRY_TIMEOUT:
448 case CLSET_RETRY_TIMEOUT:
451 case CLSET_PUSH_TIMOD:
452 case CLSET_POP_TIMOD:
461 clnttcp_destroy (CLIENT *h)
464 (struct ct_data *) h->cl_private;
468 (void) __close (ct->ct_sock);
470 XDR_DESTROY (&(ct->ct_xdrs));
471 mem_free ((caddr_t) ct, sizeof (struct ct_data));
472 mem_free ((caddr_t) h, sizeof (CLIENT));
476 * Interface between xdr serializer and tcp connection.
477 * Behaves like the system calls, read & write, but keeps some error state
478 * around for the rpc level.
481 readtcp (char *ctptr, char *buf, int len)
483 struct ct_data *ct = (struct ct_data *)ctptr;
485 int milliseconds = (ct->ct_wait.tv_sec * 1000) +
486 (ct->ct_wait.tv_usec / 1000);
495 switch (poll(&fd, 1, milliseconds))
498 ct->ct_error.re_status = RPC_TIMEDOUT;
504 ct->ct_error.re_status = RPC_CANTRECV;
505 ct->ct_error.re_errno = errno;
510 switch (len = __read (ct->ct_sock, buf, len))
515 ct->ct_error.re_errno = ECONNRESET;
516 ct->ct_error.re_status = RPC_CANTRECV;
517 len = -1; /* it's really an error */
521 ct->ct_error.re_errno = errno;
522 ct->ct_error.re_status = RPC_CANTRECV;
529 writetcp (char *ctptr, char *buf, int len)
532 struct ct_data *ct = (struct ct_data*)ctptr;
534 for (cnt = len; cnt > 0; cnt -= i, buf += i)
536 if ((i = __write (ct->ct_sock, buf, cnt)) == -1)
538 ct->ct_error.re_errno = errno;
539 ct->ct_error.re_status = RPC_CANTSEND;