1 /* @(#)clnt_udp.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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28 * Mountain View, California 94043
30 #if !defined(lint) && defined(SCCSIDS)
31 static char sccsid[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
35 * clnt_udp.c, Implements a UDP/IP based, client side RPC.
37 * Copyright (C) 1984, Sun Microsystems, Inc.
47 #include <sys/socket.h>
48 #include <sys/ioctl.h>
51 #include <rpc/pmap_clnt.h>
63 extern bool_t xdr_opaque_auth (XDR *, struct opaque_auth *);
64 extern u_long _create_xid (void);
67 * UDP bases client side rpc operations
69 static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
70 xdrproc_t, caddr_t, struct timeval);
71 static void clntudp_abort (void);
72 static void clntudp_geterr (CLIENT *, struct rpc_err *);
73 static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
74 static bool_t clntudp_control (CLIENT *, int, char *);
75 static void clntudp_destroy (CLIENT *);
77 static struct clnt_ops udp_ops =
88 * Private data kept per client handle
94 struct sockaddr_in cu_raddr;
96 struct timeval cu_wait;
97 struct timeval cu_total;
98 struct rpc_err cu_error;
108 * Create a UDP based client handle.
109 * If *sockp<0, *sockp is set to a newly created UPD socket.
110 * If raddr->sin_port is 0 a binder on the remote machine
111 * is consulted for the correct port number.
112 * NB: It is the clients responsibility to close *sockp.
113 * NB: The rpch->cl_auth is initialized to null authentication.
114 * Caller may wish to set this something more useful.
116 * wait is the amount of time used between retransmitting a call if
117 * no response has been heard; retransmission occurs until the actual
118 * rpc call times out.
120 * sendsz and recvsz are the maximum allowable packet sizes that can be
124 clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
125 struct timeval wait, int *sockp, u_int sendsz,
129 struct cu_data *cu = NULL;
130 struct rpc_msg call_msg;
132 cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
133 sendsz = ((sendsz + 3) / 4) * 4;
134 recvsz = ((recvsz + 3) / 4) * 4;
135 cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
136 if (cl == NULL || cu == NULL)
138 struct rpc_createerr *ce = &get_rpc_createerr ();
140 if (_IO_fwide (stderr, 0) > 0)
141 (void) __fwprintf (stderr, L"%s",
142 _("clntudp_create: out of memory\n"));
145 (void) fputs (_("clntudp_create: out of memory\n"), stderr);
146 ce->cf_stat = RPC_SYSTEMERROR;
147 ce->cf_error.re_errno = ENOMEM;
150 cu->cu_outbuf = &cu->cu_inbuf[recvsz];
152 if (raddr->sin_port == 0)
156 pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
160 raddr->sin_port = htons (port);
162 cl->cl_ops = &udp_ops;
163 cl->cl_private = (caddr_t) cu;
164 cu->cu_raddr = *raddr;
165 cu->cu_rlen = sizeof (cu->cu_raddr);
167 cu->cu_total.tv_sec = -1;
168 cu->cu_total.tv_usec = -1;
169 cu->cu_sendsz = sendsz;
170 cu->cu_recvsz = recvsz;
171 call_msg.rm_xid = _create_xid ();
172 call_msg.rm_direction = CALL;
173 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
174 call_msg.rm_call.cb_prog = program;
175 call_msg.rm_call.cb_vers = version;
176 INTUSE(xdrmem_create) (&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
177 if (!INTUSE(xdr_callhdr) (&(cu->cu_outxdrs), &call_msg))
181 cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
186 *sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
189 struct rpc_createerr *ce = &get_rpc_createerr ();
190 ce->cf_stat = RPC_SYSTEMERROR;
191 ce->cf_error.re_errno = errno;
194 /* attempt to bind to prov port */
195 (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
196 /* the sockets rpc controls are non-blocking */
197 (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
201 __setsockopt (*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
204 cu->cu_closeit = TRUE;
208 cu->cu_closeit = FALSE;
210 cu->cu_sock = *sockp;
211 cl->cl_auth = INTUSE(authnone_create) ();
215 mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
217 mem_free ((caddr_t) cl, sizeof (CLIENT));
218 return (CLIENT *) NULL;
220 INTDEF (clntudp_bufcreate)
223 clntudp_create (raddr, program, version, wait, sockp)
224 struct sockaddr_in *raddr;
230 return INTUSE(clntudp_bufcreate) (raddr, program, version, wait, sockp,
231 UDPMSGSIZE, UDPMSGSIZE);
233 INTDEF (clntudp_create)
236 is_network_up (int sock)
240 if (getifaddrs (&ifa) != 0)
243 struct ifaddrs *run = ifa;
246 if ((run->ifa_flags & IFF_UP) != 0
247 && run->ifa_addr->sa_family == AF_INET)
258 static enum clnt_stat
259 clntudp_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
260 CLIENT *cl; /* client handle */
261 u_long proc; /* procedure number */
262 xdrproc_t xargs; /* xdr routine for args */
263 caddr_t argsp; /* pointer to args */
264 xdrproc_t xresults; /* xdr routine for results */
265 caddr_t resultsp; /* pointer to results */
266 struct timeval utimeout; /* seconds to wait before giving up */
268 struct cu_data *cu = (struct cu_data *) cl->cl_private;
274 int milliseconds = (cu->cu_wait.tv_sec * 1000) +
275 (cu->cu_wait.tv_usec / 1000);
276 struct sockaddr_in from;
277 struct rpc_msg reply_msg;
279 struct timeval time_waited;
281 int nrefreshes = 2; /* number of times to refresh cred */
282 struct timeval timeout;
283 int anyup; /* any network interface up */
285 if (cu->cu_total.tv_usec == -1)
287 timeout = utimeout; /* use supplied timeout */
291 timeout = cu->cu_total; /* use default timeout */
294 time_waited.tv_sec = 0;
295 time_waited.tv_usec = 0;
297 xdrs = &(cu->cu_outxdrs);
300 xdrs->x_op = XDR_ENCODE;
301 XDR_SETPOS (xdrs, cu->cu_xdrpos);
303 * the transaction is the first thing in the out buffer
305 (*(uint32_t *) (cu->cu_outbuf))++;
306 if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
307 (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
308 (!(*xargs) (xdrs, argsp)))
309 return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
310 outlen = (int) XDR_GETPOS (xdrs);
313 if (__sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
314 (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
317 cu->cu_error.re_errno = errno;
318 return (cu->cu_error.re_status = RPC_CANTSEND);
322 * Hack to provide rpc-based message passing
324 if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
326 return (cu->cu_error.re_status = RPC_TIMEDOUT);
330 * sub-optimal code appears here because we have
331 * some clock time to spare while the packets are in flight.
332 * (We assume that this is actually only executed once.)
334 reply_msg.acpted_rply.ar_verf = _null_auth;
335 reply_msg.acpted_rply.ar_results.where = resultsp;
336 reply_msg.acpted_rply.ar_results.proc = xresults;
342 switch (__poll (&fd, 1, milliseconds))
348 anyup = is_network_up (cu->cu_sock);
350 return (cu->cu_error.re_status = RPC_CANTRECV);
353 time_waited.tv_sec += cu->cu_wait.tv_sec;
354 time_waited.tv_usec += cu->cu_wait.tv_usec;
355 while (time_waited.tv_usec >= 1000000)
357 time_waited.tv_sec++;
358 time_waited.tv_usec -= 1000000;
360 if ((time_waited.tv_sec < timeout.tv_sec) ||
361 ((time_waited.tv_sec == timeout.tv_sec) &&
362 (time_waited.tv_usec < timeout.tv_usec)))
364 return (cu->cu_error.re_status = RPC_TIMEDOUT);
367 * buggy in other cases because time_waited is not being
373 cu->cu_error.re_errno = errno;
374 return (cu->cu_error.re_status = RPC_CANTRECV);
377 if (fd.revents & POLLERR)
380 struct cmsghdr *cmsg;
381 struct sock_extended_err *e;
382 struct sockaddr_in err_addr;
384 char *cbuf = (char *) alloca (outlen + 256);
387 iov.iov_base = cbuf + 256;
388 iov.iov_len = outlen;
389 msg.msg_name = (void *) &err_addr;
390 msg.msg_namelen = sizeof (err_addr);
394 msg.msg_control = cbuf;
395 msg.msg_controllen = 256;
396 ret = __recvmsg (cu->cu_sock, &msg, MSG_ERRQUEUE);
398 && memcmp (cbuf + 256, cu->cu_outbuf, ret) == 0
399 && (msg.msg_flags & MSG_ERRQUEUE)
400 && ((msg.msg_namelen == 0
402 || (msg.msg_namelen == sizeof (err_addr)
403 && err_addr.sin_family == AF_INET
404 && memcmp (&err_addr.sin_addr, &cu->cu_raddr.sin_addr,
405 sizeof (err_addr.sin_addr)) == 0
406 && err_addr.sin_port == cu->cu_raddr.sin_port)))
407 for (cmsg = CMSG_FIRSTHDR (&msg); cmsg;
408 cmsg = CMSG_NXTHDR (&msg, cmsg))
409 if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
411 e = (struct sock_extended_err *) CMSG_DATA(cmsg);
412 cu->cu_error.re_errno = e->ee_errno;
413 return (cu->cu_error.re_status = RPC_CANTRECV);
419 fromlen = sizeof (struct sockaddr);
420 inlen = __recvfrom (cu->cu_sock, cu->cu_inbuf,
421 (int) cu->cu_recvsz, 0,
422 (struct sockaddr *) &from, &fromlen);
424 while (inlen < 0 && errno == EINTR);
427 if (errno == EWOULDBLOCK)
429 cu->cu_error.re_errno = errno;
430 return (cu->cu_error.re_status = RPC_CANTRECV);
435 /* see if reply transaction id matches sent id.
436 Don't do this if we only wait for a replay */
438 && (*((u_int32_t *) (cu->cu_inbuf))
439 != *((u_int32_t *) (cu->cu_outbuf))))
441 /* we now assume we have the proper reply */
446 * now decode and validate the response
448 INTUSE(xdrmem_create) (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
449 ok = INTUSE(xdr_replymsg) (&reply_xdrs, &reply_msg);
450 /* XDR_DESTROY(&reply_xdrs); save a few cycles on noop destroy */
453 _seterr_reply (&reply_msg, &(cu->cu_error));
454 if (cu->cu_error.re_status == RPC_SUCCESS)
456 if (!AUTH_VALIDATE (cl->cl_auth,
457 &reply_msg.acpted_rply.ar_verf))
459 cu->cu_error.re_status = RPC_AUTHERROR;
460 cu->cu_error.re_why = AUTH_INVALIDRESP;
462 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
464 xdrs->x_op = XDR_FREE;
465 (void) INTUSE(xdr_opaque_auth) (xdrs,
466 &(reply_msg.acpted_rply.ar_verf));
468 } /* end successful completion */
471 /* maybe our credentials need to be refreshed ... */
472 if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
477 } /* end of unsuccessful completion */
478 } /* end of valid reply message */
481 cu->cu_error.re_status = RPC_CANTDECODERES;
483 return cu->cu_error.re_status;
487 clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
489 struct cu_data *cu = (struct cu_data *) cl->cl_private;
491 *errp = cu->cu_error;
496 clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
498 struct cu_data *cu = (struct cu_data *) cl->cl_private;
499 XDR *xdrs = &(cu->cu_outxdrs);
501 xdrs->x_op = XDR_FREE;
502 return (*xdr_res) (xdrs, res_ptr);
511 clntudp_control (CLIENT *cl, int request, char *info)
513 struct cu_data *cu = (struct cu_data *) cl->cl_private;
518 cu->cu_closeit = TRUE;
520 case CLSET_FD_NCLOSE:
521 cu->cu_closeit = FALSE;
524 cu->cu_total = *(struct timeval *) info;
527 *(struct timeval *) info = cu->cu_total;
529 case CLSET_RETRY_TIMEOUT:
530 cu->cu_wait = *(struct timeval *) info;
532 case CLGET_RETRY_TIMEOUT:
533 *(struct timeval *) info = cu->cu_wait;
535 case CLGET_SERVER_ADDR:
536 *(struct sockaddr_in *) info = cu->cu_raddr;
539 *(int *)info = cu->cu_sock;
543 * use the knowledge that xid is the
544 * first element in the call structure *.
545 * This will get the xid of the PREVIOUS call
547 *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
550 /* This will set the xid of the NEXT call */
551 *(u_long *)cu->cu_outbuf = htonl(*(u_long *)info - 1);
552 /* decrement by 1 as clntudp_call() increments once */
555 * This RELIES on the information that, in the call body,
556 * the version number field is the fifth field from the
557 * begining of the RPC header. MUST be changed if the
558 * call_struct is changed
560 *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
561 4 * BYTES_PER_XDR_UNIT));
564 *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
565 = htonl(*(u_long *)info);
569 * This RELIES on the information that, in the call body,
570 * the program number field is the field from the
571 * begining of the RPC header. MUST be changed if the
572 * call_struct is changed
574 *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
575 3 * BYTES_PER_XDR_UNIT));
578 *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
579 = htonl(*(u_long *)info);
581 /* The following are only possible with TI-RPC */
584 case CLSET_PUSH_TIMOD:
585 case CLSET_POP_TIMOD:
593 clntudp_destroy (CLIENT *cl)
595 struct cu_data *cu = (struct cu_data *) cl->cl_private;
599 (void) __close (cu->cu_sock);
601 XDR_DESTROY (&(cu->cu_outxdrs));
602 mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
603 mem_free ((caddr_t) cl, sizeof (CLIENT));