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
4 * unrestricted use provided that this legend is included on all tape
5 * media and as a part of the software program in whole or part. Users
6 * may copy or modify Sun RPC without charge, but are not authorized
7 * to license or distribute it to anyone else except as part of a product or
8 * program developed by the user.
10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 * Sun RPC is provided with no support and without any obligation on the
15 * part of Sun Microsystems, Inc. to assist in its use, correction,
16 * modification or enhancement.
18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20 * OR ANY PART THEREOF.
22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23 * or profits or other special, indirect and consequential damages, even if
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26 * Sun Microsystems, Inc.
28 * Mountain View, California 94043
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.
62 #include <sys/socket.h>
63 #include <rpc/pmap_clnt.h>
68 libc_hidden_proto(socket)
69 libc_hidden_proto(read)
70 libc_hidden_proto(write)
71 libc_hidden_proto(close)
72 libc_hidden_proto(authnone_create)
73 libc_hidden_proto(xdrrec_create)
74 libc_hidden_proto(xdrrec_endofrecord)
75 libc_hidden_proto(xdrrec_skiprecord)
76 libc_hidden_proto(xdr_callhdr)
77 libc_hidden_proto(xdr_replymsg)
78 libc_hidden_proto(xdr_opaque_auth)
79 libc_hidden_proto(xdrmem_create)
80 libc_hidden_proto(pmap_getport)
81 libc_hidden_proto(_seterr_reply)
82 libc_hidden_proto(connect)
83 libc_hidden_proto(bindresvport)
84 libc_hidden_proto(poll)
85 libc_hidden_proto(fputs)
87 libc_hidden_proto(fwprintf)
89 libc_hidden_proto(__rpc_thread_createerr)
91 extern u_long _create_xid (void) attribute_hidden;
93 #define MCALL_MSG_SIZE 24
99 struct timeval ct_wait;
100 bool_t ct_waitset; /* wait set by clnt_control? */
101 struct sockaddr_in ct_addr;
102 struct rpc_err ct_error;
103 char ct_mcall[MCALL_MSG_SIZE]; /* marshalled callmsg */
104 u_int ct_mpos; /* pos after marshal */
108 static int readtcp (char *, char *, int);
109 static int writetcp (char *, char *, int);
111 static enum clnt_stat clnttcp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
112 xdrproc_t, caddr_t, struct timeval);
113 static void clnttcp_abort (void);
114 static void clnttcp_geterr (CLIENT *, struct rpc_err *);
115 static bool_t clnttcp_freeres (CLIENT *, xdrproc_t, caddr_t);
116 static bool_t clnttcp_control (CLIENT *, int, char *);
117 static void clnttcp_destroy (CLIENT *);
119 static struct clnt_ops tcp_ops =
130 * Create a client handle for a tcp/ip connection.
131 * If *sockp<0, *sockp is set to a newly created TCP socket and it is
132 * connected to raddr. If *sockp non-negative then
133 * raddr is ignored. The rpc/tcp package does buffering
134 * similar to stdio, so the client must pick send and receive buffer sizes,];
135 * 0 => use the default.
136 * If raddr->sin_port is 0, then a binder on the remote machine is
137 * consulted for the right port number.
138 * NB: *sockp is copied into a private area.
139 * NB: It is the clients responsibility to close *sockp.
140 * NB: The rpch->cl_auth is set null authentication. Caller may wish to set this
141 * something more useful.
144 clnttcp_create (struct sockaddr_in *raddr, u_long prog, u_long vers,
145 int *sockp, u_int sendsz, u_int recvsz)
149 struct rpc_msg call_msg;
151 h = (CLIENT *) mem_alloc (sizeof (*h));
152 ct = (struct ct_data *) mem_alloc (sizeof (*ct));
153 if (h == NULL || ct == NULL)
155 struct rpc_createerr *ce = &get_rpc_createerr ();
157 if (_IO_fwide (stderr, 0) > 0)
158 (void) fwprintf (stderr, L"%s",
159 _("clnttcp_create: out of memory\n"));
162 (void) fputs (_("clnttcp_create: out of memory\n"), stderr);
163 ce->cf_stat = RPC_SYSTEMERROR;
164 ce->cf_error.re_errno = ENOMEM;
169 * If no port number given ask the pmap for one
171 if (raddr->sin_port == 0)
174 if ((port = pmap_getport (raddr, prog, vers, IPPROTO_TCP)) == 0)
176 mem_free ((caddr_t) ct, sizeof (struct ct_data));
177 mem_free ((caddr_t) h, sizeof (CLIENT));
178 return ((CLIENT *) NULL);
180 raddr->sin_port = htons (port);
184 * If no socket given, open one
188 *sockp = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
189 (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
191 || (connect (*sockp, (struct sockaddr *) raddr,
192 sizeof (*raddr)) < 0))
194 struct rpc_createerr *ce = &get_rpc_createerr ();
195 ce->cf_stat = RPC_SYSTEMERROR;
196 ce->cf_error.re_errno = errno;
198 (void) close (*sockp);
201 ct->ct_closeit = TRUE;
205 ct->ct_closeit = FALSE;
209 * Set up private data struct
211 ct->ct_sock = *sockp;
212 ct->ct_wait.tv_usec = 0;
213 ct->ct_waitset = FALSE;
214 ct->ct_addr = *raddr;
217 * Initialize call message
219 call_msg.rm_xid = _create_xid ();
220 call_msg.rm_direction = CALL;
221 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
222 call_msg.rm_call.cb_prog = prog;
223 call_msg.rm_call.cb_vers = vers;
226 * pre-serialize the static part of the call msg and stash it away
228 xdrmem_create (&(ct->ct_xdrs), ct->ct_mcall, MCALL_MSG_SIZE,
230 if (!xdr_callhdr (&(ct->ct_xdrs), &call_msg))
234 (void) close (*sockp);
238 ct->ct_mpos = XDR_GETPOS (&(ct->ct_xdrs));
239 XDR_DESTROY (&(ct->ct_xdrs));
242 * Create a client handle which uses xdrrec for serialization
243 * and authnone for authentication.
245 xdrrec_create (&(ct->ct_xdrs), sendsz, recvsz,
246 (caddr_t) ct, readtcp, writetcp);
247 h->cl_ops = &tcp_ops;
248 h->cl_private = (caddr_t) ct;
249 h->cl_auth = authnone_create ();
254 * Something goofed, free stuff and barf
256 mem_free ((caddr_t) ct, sizeof (struct ct_data));
257 mem_free ((caddr_t) h, sizeof (CLIENT));
258 return ((CLIENT *) NULL);
260 libc_hidden_proto(clnttcp_create)
261 libc_hidden_def(clnttcp_create)
263 static enum clnt_stat
264 clnttcp_call (h, proc, xdr_args, args_ptr, xdr_results, results_ptr, timeout)
269 xdrproc_t xdr_results;
271 struct timeval timeout;
273 struct ct_data *ct = (struct ct_data *) h->cl_private;
274 XDR *xdrs = &(ct->ct_xdrs);
275 struct rpc_msg reply_msg;
277 u_int32_t *msg_x_id = (u_int32_t *) (ct->ct_mcall); /* yuk */
283 ct->ct_wait = timeout;
287 (xdr_results == (xdrproc_t) 0 && ct->ct_wait.tv_sec == 0
288 && ct->ct_wait.tv_usec == 0) ? FALSE : TRUE;
291 xdrs->x_op = XDR_ENCODE;
292 ct->ct_error.re_status = RPC_SUCCESS;
293 x_id = ntohl (--(*msg_x_id));
294 if ((!XDR_PUTBYTES (xdrs, ct->ct_mcall, ct->ct_mpos)) ||
295 (!XDR_PUTLONG (xdrs, (long *) &proc)) ||
296 (!AUTH_MARSHALL (h->cl_auth, xdrs)) ||
297 (!(*xdr_args) (xdrs, args_ptr)))
299 if (ct->ct_error.re_status == RPC_SUCCESS)
300 ct->ct_error.re_status = RPC_CANTENCODEARGS;
301 (void) xdrrec_endofrecord (xdrs, TRUE);
302 return (ct->ct_error.re_status);
304 if (!xdrrec_endofrecord (xdrs, shipnow))
305 return ct->ct_error.re_status = RPC_CANTSEND;
309 * Hack to provide rpc-based message passing
311 if (ct->ct_wait.tv_sec == 0 && ct->ct_wait.tv_usec == 0)
313 return ct->ct_error.re_status = RPC_TIMEDOUT;
318 * Keep receiving until we get a valid transaction id
320 xdrs->x_op = XDR_DECODE;
323 reply_msg.acpted_rply.ar_verf = _null_auth;
324 reply_msg.acpted_rply.ar_results.where = NULL;
325 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
326 if (!xdrrec_skiprecord (xdrs))
327 return (ct->ct_error.re_status);
328 /* now decode and validate the response header */
329 if (!xdr_replymsg (xdrs, &reply_msg))
331 if (ct->ct_error.re_status == RPC_SUCCESS)
333 return ct->ct_error.re_status;
335 if ((u_int32_t) reply_msg.rm_xid == (u_int32_t) x_id)
342 _seterr_reply (&reply_msg, &(ct->ct_error));
343 if (ct->ct_error.re_status == RPC_SUCCESS)
345 if (!AUTH_VALIDATE (h->cl_auth, &reply_msg.acpted_rply.ar_verf))
347 ct->ct_error.re_status = RPC_AUTHERROR;
348 ct->ct_error.re_why = AUTH_INVALIDRESP;
350 else if (!(*xdr_results) (xdrs, results_ptr))
352 if (ct->ct_error.re_status == RPC_SUCCESS)
353 ct->ct_error.re_status = RPC_CANTDECODERES;
355 /* free verifier ... */
356 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
358 xdrs->x_op = XDR_FREE;
359 (void) xdr_opaque_auth (xdrs, &(reply_msg.acpted_rply.ar_verf));
361 } /* end successful completion */
364 /* maybe our credentials need to be refreshed ... */
365 if (refreshes-- && AUTH_REFRESH (h->cl_auth))
367 } /* end of unsuccessful completion */
368 return ct->ct_error.re_status;
372 clnttcp_geterr (h, errp)
374 struct rpc_err *errp;
377 (struct ct_data *) h->cl_private;
379 *errp = ct->ct_error;
383 clnttcp_freeres (cl, xdr_res, res_ptr)
388 struct ct_data *ct = (struct ct_data *) cl->cl_private;
389 XDR *xdrs = &(ct->ct_xdrs);
391 xdrs->x_op = XDR_FREE;
392 return (*xdr_res) (xdrs, res_ptr);
401 clnttcp_control (CLIENT *cl, int request, char *info)
403 struct ct_data *ct = (struct ct_data *) cl->cl_private;
409 ct->ct_closeit = TRUE;
411 case CLSET_FD_NCLOSE:
412 ct->ct_closeit = FALSE;
415 ct->ct_wait = *(struct timeval *) info;
416 ct->ct_waitset = TRUE;
419 *(struct timeval *) info = ct->ct_wait;
421 case CLGET_SERVER_ADDR:
422 *(struct sockaddr_in *) info = ct->ct_addr;
425 *(int *)info = ct->ct_sock;
429 * use the knowledge that xid is the
430 * first element in the call structure *.
431 * This will get the xid of the PREVIOUS call
433 *(u_long *)info = ntohl (*(u_long *)ct->ct_mcall);
436 /* This will set the xid of the NEXT call */
437 *(u_long *)ct->ct_mcall = htonl (*(u_long *)info - 1);
438 /* decrement by 1 as clnttcp_call() increments once */
441 * This RELIES on the information that, in the call body,
442 * the version number field is the fifth field from the
443 * begining of the RPC header. MUST be changed if the
444 * call_struct is changed
446 *(u_long *)info = ntohl (*(u_long *)(ct->ct_mcall +
447 4 * BYTES_PER_XDR_UNIT));
450 *(u_long *)(ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT)
451 = htonl (*(u_long *)info);
455 * This RELIES on the information that, in the call body,
456 * the program number field is the field from the
457 * begining of the RPC header. MUST be changed if the
458 * call_struct is changed
460 *(u_long *)info = ntohl(*(u_long *)(ct->ct_mcall +
461 3 * BYTES_PER_XDR_UNIT));
464 *(u_long *)(ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT)
465 = htonl(*(u_long *)info);
467 /* The following are only possible with TI-RPC */
468 case CLGET_RETRY_TIMEOUT:
469 case CLSET_RETRY_TIMEOUT:
472 case CLSET_PUSH_TIMOD:
473 case CLSET_POP_TIMOD:
482 clnttcp_destroy (CLIENT *h)
485 (struct ct_data *) h->cl_private;
489 (void) close (ct->ct_sock);
491 XDR_DESTROY (&(ct->ct_xdrs));
492 mem_free ((caddr_t) ct, sizeof (struct ct_data));
493 mem_free ((caddr_t) h, sizeof (CLIENT));
497 * Interface between xdr serializer and tcp connection.
498 * Behaves like the system calls, read & write, but keeps some error state
499 * around for the rpc level.
502 readtcp (char *ctptr, char *buf, int len)
504 struct ct_data *ct = (struct ct_data *)ctptr;
506 int milliseconds = (ct->ct_wait.tv_sec * 1000) +
507 (ct->ct_wait.tv_usec / 1000);
516 switch (poll(&fd, 1, milliseconds))
519 ct->ct_error.re_status = RPC_TIMEDOUT;
525 ct->ct_error.re_status = RPC_CANTRECV;
526 ct->ct_error.re_errno = errno;
531 switch (len = read (ct->ct_sock, buf, len))
536 ct->ct_error.re_errno = ECONNRESET;
537 ct->ct_error.re_status = RPC_CANTRECV;
538 len = -1; /* it's really an error */
542 ct->ct_error.re_errno = errno;
543 ct->ct_error.re_status = RPC_CANTRECV;
550 writetcp (char *ctptr, char *buf, int len)
553 struct ct_data *ct = (struct ct_data*)ctptr;
555 for (cnt = len; cnt > 0; cnt -= i, buf += i)
557 if ((i = write (ct->ct_sock, buf, cnt)) == -1)
559 ct->ct_error.re_errno = errno;
560 ct->ct_error.re_status = RPC_CANTSEND;