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 xdrrec_endofrecord __xdrrec_endofrecord
56 #define xdrrec_skiprecord __xdrrec_skiprecord
57 #define xdr_callhdr __xdr_callhdr
58 #define xdr_replymsg __xdr_replymsg
59 #define xdr_opaque_auth __xdr_opaque_auth
60 #define xdrmem_create __xdrmem_create
61 #define pmap_getport __pmap_getport
62 #define _seterr_reply __seterr_reply
63 #define connect __connect
64 #define bindresvport __bindresvport
76 #include <sys/socket.h>
77 #include <rpc/pmap_clnt.h>
82 extern u_long _create_xid (void) attribute_hidden;
84 #define MCALL_MSG_SIZE 24
90 struct timeval ct_wait;
91 bool_t ct_waitset; /* wait set by clnt_control? */
92 struct sockaddr_in ct_addr;
93 struct rpc_err ct_error;
94 char ct_mcall[MCALL_MSG_SIZE]; /* marshalled callmsg */
95 u_int ct_mpos; /* pos after marshal */
99 static int readtcp (char *, char *, int);
100 static int writetcp (char *, char *, int);
102 static enum clnt_stat clnttcp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
103 xdrproc_t, caddr_t, struct timeval);
104 static void clnttcp_abort (void);
105 static void clnttcp_geterr (CLIENT *, struct rpc_err *);
106 static bool_t clnttcp_freeres (CLIENT *, xdrproc_t, caddr_t);
107 static bool_t clnttcp_control (CLIENT *, int, char *);
108 static void clnttcp_destroy (CLIENT *);
110 static struct clnt_ops tcp_ops =
121 * Create a client handle for a tcp/ip connection.
122 * If *sockp<0, *sockp is set to a newly created TCP socket and it is
123 * connected to raddr. If *sockp non-negative then
124 * raddr is ignored. The rpc/tcp package does buffering
125 * similar to stdio, so the client must pick send and receive buffer sizes,];
126 * 0 => use the default.
127 * If raddr->sin_port is 0, then a binder on the remote machine is
128 * consulted for the right port number.
129 * NB: *sockp is copied into a private area.
130 * NB: It is the clients responsibility to close *sockp.
131 * NB: The rpch->cl_auth is set null authentication. Caller may wish to set this
132 * something more useful.
134 CLIENT attribute_hidden *
135 __clnttcp_create (struct sockaddr_in *raddr, u_long prog, u_long vers,
136 int *sockp, u_int sendsz, u_int recvsz)
140 struct rpc_msg call_msg;
142 h = (CLIENT *) mem_alloc (sizeof (*h));
143 ct = (struct ct_data *) mem_alloc (sizeof (*ct));
144 if (h == NULL || ct == NULL)
146 struct rpc_createerr *ce = &get_rpc_createerr ();
148 if (_IO_fwide (stderr, 0) > 0)
149 (void) __fwprintf (stderr, L"%s",
150 _("clnttcp_create: out of memory\n"));
153 (void) fputs (_("clnttcp_create: out of memory\n"), stderr);
154 ce->cf_stat = RPC_SYSTEMERROR;
155 ce->cf_error.re_errno = ENOMEM;
160 * If no port number given ask the pmap for one
162 if (raddr->sin_port == 0)
165 if ((port = pmap_getport (raddr, prog, vers, IPPROTO_TCP)) == 0)
167 mem_free ((caddr_t) ct, sizeof (struct ct_data));
168 mem_free ((caddr_t) h, sizeof (CLIENT));
169 return ((CLIENT *) NULL);
171 raddr->sin_port = htons (port);
175 * If no socket given, open one
179 *sockp = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
180 (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
182 || (connect (*sockp, (struct sockaddr *) raddr,
183 sizeof (*raddr)) < 0))
185 struct rpc_createerr *ce = &get_rpc_createerr ();
186 ce->cf_stat = RPC_SYSTEMERROR;
187 ce->cf_error.re_errno = errno;
189 (void) __close (*sockp);
192 ct->ct_closeit = TRUE;
196 ct->ct_closeit = FALSE;
200 * Set up private data struct
202 ct->ct_sock = *sockp;
203 ct->ct_wait.tv_usec = 0;
204 ct->ct_waitset = FALSE;
205 ct->ct_addr = *raddr;
208 * Initialize call message
210 call_msg.rm_xid = _create_xid ();
211 call_msg.rm_direction = CALL;
212 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
213 call_msg.rm_call.cb_prog = prog;
214 call_msg.rm_call.cb_vers = vers;
217 * pre-serialize the static part of the call msg and stash it away
219 xdrmem_create (&(ct->ct_xdrs), ct->ct_mcall, MCALL_MSG_SIZE,
221 if (!xdr_callhdr (&(ct->ct_xdrs), &call_msg))
225 (void) __close (*sockp);
229 ct->ct_mpos = XDR_GETPOS (&(ct->ct_xdrs));
230 XDR_DESTROY (&(ct->ct_xdrs));
233 * Create a client handle which uses xdrrec for serialization
234 * and authnone for authentication.
236 xdrrec_create (&(ct->ct_xdrs), sendsz, recvsz,
237 (caddr_t) ct, readtcp, writetcp);
238 h->cl_ops = &tcp_ops;
239 h->cl_private = (caddr_t) ct;
240 h->cl_auth = authnone_create ();
245 * Something goofed, free stuff and barf
247 mem_free ((caddr_t) ct, sizeof (struct ct_data));
248 mem_free ((caddr_t) h, sizeof (CLIENT));
249 return ((CLIENT *) NULL);
251 strong_alias(__clnttcp_create,clnttcp_create)
253 static enum clnt_stat
254 clnttcp_call (h, proc, xdr_args, args_ptr, xdr_results, results_ptr, timeout)
259 xdrproc_t xdr_results;
261 struct timeval timeout;
263 struct ct_data *ct = (struct ct_data *) h->cl_private;
264 XDR *xdrs = &(ct->ct_xdrs);
265 struct rpc_msg reply_msg;
267 u_int32_t *msg_x_id = (u_int32_t *) (ct->ct_mcall); /* yuk */
273 ct->ct_wait = timeout;
277 (xdr_results == (xdrproc_t) 0 && ct->ct_wait.tv_sec == 0
278 && ct->ct_wait.tv_usec == 0) ? FALSE : TRUE;
281 xdrs->x_op = XDR_ENCODE;
282 ct->ct_error.re_status = RPC_SUCCESS;
283 x_id = ntohl (--(*msg_x_id));
284 if ((!XDR_PUTBYTES (xdrs, ct->ct_mcall, ct->ct_mpos)) ||
285 (!XDR_PUTLONG (xdrs, (long *) &proc)) ||
286 (!AUTH_MARSHALL (h->cl_auth, xdrs)) ||
287 (!(*xdr_args) (xdrs, args_ptr)))
289 if (ct->ct_error.re_status == RPC_SUCCESS)
290 ct->ct_error.re_status = RPC_CANTENCODEARGS;
291 (void) xdrrec_endofrecord (xdrs, TRUE);
292 return (ct->ct_error.re_status);
294 if (!xdrrec_endofrecord (xdrs, shipnow))
295 return ct->ct_error.re_status = RPC_CANTSEND;
299 * Hack to provide rpc-based message passing
301 if (ct->ct_wait.tv_sec == 0 && ct->ct_wait.tv_usec == 0)
303 return ct->ct_error.re_status = RPC_TIMEDOUT;
308 * Keep receiving until we get a valid transaction id
310 xdrs->x_op = XDR_DECODE;
313 reply_msg.acpted_rply.ar_verf = _null_auth;
314 reply_msg.acpted_rply.ar_results.where = NULL;
315 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
316 if (!xdrrec_skiprecord (xdrs))
317 return (ct->ct_error.re_status);
318 /* now decode and validate the response header */
319 if (!xdr_replymsg (xdrs, &reply_msg))
321 if (ct->ct_error.re_status == RPC_SUCCESS)
323 return ct->ct_error.re_status;
325 if ((u_int32_t) reply_msg.rm_xid == (u_int32_t) x_id)
332 _seterr_reply (&reply_msg, &(ct->ct_error));
333 if (ct->ct_error.re_status == RPC_SUCCESS)
335 if (!AUTH_VALIDATE (h->cl_auth, &reply_msg.acpted_rply.ar_verf))
337 ct->ct_error.re_status = RPC_AUTHERROR;
338 ct->ct_error.re_why = AUTH_INVALIDRESP;
340 else if (!(*xdr_results) (xdrs, results_ptr))
342 if (ct->ct_error.re_status == RPC_SUCCESS)
343 ct->ct_error.re_status = RPC_CANTDECODERES;
345 /* free verifier ... */
346 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
348 xdrs->x_op = XDR_FREE;
349 (void) xdr_opaque_auth (xdrs, &(reply_msg.acpted_rply.ar_verf));
351 } /* end successful completion */
354 /* maybe our credentials need to be refreshed ... */
355 if (refreshes-- && AUTH_REFRESH (h->cl_auth))
357 } /* end of unsuccessful completion */
358 return ct->ct_error.re_status;
362 clnttcp_geterr (h, errp)
364 struct rpc_err *errp;
367 (struct ct_data *) h->cl_private;
369 *errp = ct->ct_error;
373 clnttcp_freeres (cl, xdr_res, res_ptr)
378 struct ct_data *ct = (struct ct_data *) cl->cl_private;
379 XDR *xdrs = &(ct->ct_xdrs);
381 xdrs->x_op = XDR_FREE;
382 return (*xdr_res) (xdrs, res_ptr);
391 clnttcp_control (CLIENT *cl, int request, char *info)
393 struct ct_data *ct = (struct ct_data *) cl->cl_private;
399 ct->ct_closeit = TRUE;
401 case CLSET_FD_NCLOSE:
402 ct->ct_closeit = FALSE;
405 ct->ct_wait = *(struct timeval *) info;
406 ct->ct_waitset = TRUE;
409 *(struct timeval *) info = ct->ct_wait;
411 case CLGET_SERVER_ADDR:
412 *(struct sockaddr_in *) info = ct->ct_addr;
415 *(int *)info = ct->ct_sock;
419 * use the knowledge that xid is the
420 * first element in the call structure *.
421 * This will get the xid of the PREVIOUS call
423 *(u_long *)info = ntohl (*(u_long *)ct->ct_mcall);
426 /* This will set the xid of the NEXT call */
427 *(u_long *)ct->ct_mcall = htonl (*(u_long *)info - 1);
428 /* decrement by 1 as clnttcp_call() increments once */
431 * This RELIES on the information that, in the call body,
432 * the version number field is the fifth field from the
433 * begining of the RPC header. MUST be changed if the
434 * call_struct is changed
436 *(u_long *)info = ntohl (*(u_long *)(ct->ct_mcall +
437 4 * BYTES_PER_XDR_UNIT));
440 *(u_long *)(ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT)
441 = htonl (*(u_long *)info);
445 * This RELIES on the information that, in the call body,
446 * the program number field is the field from the
447 * begining of the RPC header. MUST be changed if the
448 * call_struct is changed
450 *(u_long *)info = ntohl(*(u_long *)(ct->ct_mcall +
451 3 * BYTES_PER_XDR_UNIT));
454 *(u_long *)(ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT)
455 = htonl(*(u_long *)info);
457 /* The following are only possible with TI-RPC */
458 case CLGET_RETRY_TIMEOUT:
459 case CLSET_RETRY_TIMEOUT:
462 case CLSET_PUSH_TIMOD:
463 case CLSET_POP_TIMOD:
472 clnttcp_destroy (CLIENT *h)
475 (struct ct_data *) h->cl_private;
479 (void) __close (ct->ct_sock);
481 XDR_DESTROY (&(ct->ct_xdrs));
482 mem_free ((caddr_t) ct, sizeof (struct ct_data));
483 mem_free ((caddr_t) h, sizeof (CLIENT));
487 * Interface between xdr serializer and tcp connection.
488 * Behaves like the system calls, read & write, but keeps some error state
489 * around for the rpc level.
492 readtcp (char *ctptr, char *buf, int len)
494 struct ct_data *ct = (struct ct_data *)ctptr;
496 int milliseconds = (ct->ct_wait.tv_sec * 1000) +
497 (ct->ct_wait.tv_usec / 1000);
506 switch (poll(&fd, 1, milliseconds))
509 ct->ct_error.re_status = RPC_TIMEDOUT;
515 ct->ct_error.re_status = RPC_CANTRECV;
516 ct->ct_error.re_errno = errno;
521 switch (len = __read (ct->ct_sock, buf, len))
526 ct->ct_error.re_errno = ECONNRESET;
527 ct->ct_error.re_status = RPC_CANTRECV;
528 len = -1; /* it's really an error */
532 ct->ct_error.re_errno = errno;
533 ct->ct_error.re_status = RPC_CANTRECV;
540 writetcp (char *ctptr, char *buf, int len)
543 struct ct_data *ct = (struct ct_data*)ctptr;
545 for (cnt = len; cnt > 0; cnt -= i, buf += i)
547 if ((i = __write (ct->ct_sock, buf, cnt)) == -1)
549 ct->ct_error.re_errno = errno;
550 ct->ct_error.re_status = RPC_CANTSEND;