1 /* @(#)clnt_udp.c 2.2 88/08/01 4.0 RPCSRC */
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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.
46 #include <sys/socket.h>
47 #include <sys/ioctl.h>
50 #include <rpc/pmap_clnt.h>
53 extern bool_t xdr_opaque_auth (XDR *, struct opaque_auth *);
54 extern u_long _create_xid (void);
57 * UDP bases client side rpc operations
59 static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
60 xdrproc_t, caddr_t, struct timeval);
61 static void clntudp_abort (void);
62 static void clntudp_geterr (CLIENT *, struct rpc_err *);
63 static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
64 static bool_t clntudp_control (CLIENT *, int, char *);
65 static void clntudp_destroy (CLIENT *);
67 static struct clnt_ops udp_ops =
78 * Private data kept per client handle
84 struct sockaddr_in cu_raddr;
86 struct timeval cu_wait;
87 struct timeval cu_total;
88 struct rpc_err cu_error;
98 * Create a UDP based client handle.
99 * If *sockp<0, *sockp is set to a newly created UPD socket.
100 * If raddr->sin_port is 0 a binder on the remote machine
101 * is consulted for the correct port number.
102 * NB: It is the clients responsibility to close *sockp.
103 * NB: The rpch->cl_auth is initialized to null authentication.
104 * Caller may wish to set this something more useful.
106 * wait is the amount of time used between retransmitting a call if
107 * no response has been heard; retransmission occurs until the actual
108 * rpc call times out.
110 * sendsz and recvsz are the maximum allowable packet sizes that can be
114 clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
115 struct timeval wait, int *sockp, u_int sendsz,
119 struct cu_data *cu = NULL;
120 struct rpc_msg call_msg;
122 cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
125 (void) fprintf (stderr, _("clntudp_create: out of memory\n"));
126 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
127 rpc_createerr.cf_error.re_errno = errno;
130 sendsz = ((sendsz + 3) / 4) * 4;
131 recvsz = ((recvsz + 3) / 4) * 4;
132 cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
135 (void) fprintf (stderr, _("clntudp_create: out of memory\n"));
136 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
137 rpc_createerr.cf_error.re_errno = errno;
140 cu->cu_outbuf = &cu->cu_inbuf[recvsz];
142 if (raddr->sin_port == 0)
146 pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
150 raddr->sin_port = htons (port);
152 cl->cl_ops = &udp_ops;
153 cl->cl_private = (caddr_t) cu;
154 cu->cu_raddr = *raddr;
155 cu->cu_rlen = sizeof (cu->cu_raddr);
157 cu->cu_total.tv_sec = -1;
158 cu->cu_total.tv_usec = -1;
159 cu->cu_sendsz = sendsz;
160 cu->cu_recvsz = recvsz;
161 call_msg.rm_xid = _create_xid ();
162 call_msg.rm_direction = CALL;
163 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
164 call_msg.rm_call.cb_prog = program;
165 call_msg.rm_call.cb_vers = version;
166 xdrmem_create (&(cu->cu_outxdrs), cu->cu_outbuf,
168 if (!xdr_callhdr (&(cu->cu_outxdrs), &call_msg))
172 cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
177 *sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
180 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
181 rpc_createerr.cf_error.re_errno = errno;
184 /* attempt to bind to prov port */
185 (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
186 /* the sockets rpc controls are non-blocking */
187 (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
188 cu->cu_closeit = TRUE;
192 cu->cu_closeit = FALSE;
194 cu->cu_sock = *sockp;
195 cl->cl_auth = authnone_create ();
199 mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
201 mem_free ((caddr_t) cl, sizeof (CLIENT));
202 return (CLIENT *) NULL;
206 clntudp_create (raddr, program, version, wait, sockp)
207 struct sockaddr_in *raddr;
214 return clntudp_bufcreate (raddr, program, version, wait, sockp,
215 UDPMSGSIZE, UDPMSGSIZE);
219 is_network_up (int sock)
222 char buf[UDPMSGSIZE];
223 struct ifreq ifreq, *ifr;
226 ifc.ifc_len = sizeof (buf);
228 if (__ioctl(sock, SIOCGIFCONF, (char *) &ifc) == 0)
231 for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
234 if (__ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
237 if ((ifreq.ifr_flags & IFF_UP)
238 && ifr->ifr_addr.sa_family == AF_INET)
245 static enum clnt_stat
246 clntudp_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
247 CLIENT *cl; /* client handle */
248 u_long proc; /* procedure number */
249 xdrproc_t xargs; /* xdr routine for args */
250 caddr_t argsp; /* pointer to args */
251 xdrproc_t xresults; /* xdr routine for results */
252 caddr_t resultsp; /* pointer to results */
253 struct timeval utimeout; /* seconds to wait before giving up */
255 struct cu_data *cu = (struct cu_data *) cl->cl_private;
261 int milliseconds = (cu->cu_wait.tv_sec * 1000) +
262 (cu->cu_wait.tv_usec / 1000);
263 struct sockaddr_in from;
264 struct rpc_msg reply_msg;
266 struct timeval time_waited;
268 int nrefreshes = 2; /* number of times to refresh cred */
269 struct timeval timeout;
270 int anyup; /* any network interface up */
272 if (cu->cu_total.tv_usec == -1)
274 timeout = utimeout; /* use supplied timeout */
278 timeout = cu->cu_total; /* use default timeout */
281 time_waited.tv_sec = 0;
282 time_waited.tv_usec = 0;
284 xdrs = &(cu->cu_outxdrs);
287 xdrs->x_op = XDR_ENCODE;
288 XDR_SETPOS (xdrs, cu->cu_xdrpos);
290 * the transaction is the first thing in the out buffer
292 (*(u_short *) (cu->cu_outbuf))++;
293 if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
294 (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
295 (!(*xargs) (xdrs, argsp)))
296 return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
297 outlen = (int) XDR_GETPOS (xdrs);
300 if (sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
301 (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
304 cu->cu_error.re_errno = errno;
305 return (cu->cu_error.re_status = RPC_CANTSEND);
309 * Hack to provide rpc-based message passing
311 if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
313 return (cu->cu_error.re_status = RPC_TIMEDOUT);
317 * sub-optimal code appears here because we have
318 * some clock time to spare while the packets are in flight.
319 * (We assume that this is actually only executed once.)
321 reply_msg.acpted_rply.ar_verf = _null_auth;
322 reply_msg.acpted_rply.ar_results.where = resultsp;
323 reply_msg.acpted_rply.ar_results.proc = xresults;
328 switch (__poll (&fd, 1, milliseconds))
334 anyup = is_network_up (cu->cu_sock);
336 return (cu->cu_error.re_status = RPC_CANTRECV);
339 time_waited.tv_sec += cu->cu_wait.tv_sec;
340 time_waited.tv_usec += cu->cu_wait.tv_usec;
341 while (time_waited.tv_usec >= 1000000)
343 time_waited.tv_sec++;
344 time_waited.tv_usec -= 1000000;
346 if ((time_waited.tv_sec < timeout.tv_sec) ||
347 ((time_waited.tv_sec == timeout.tv_sec) &&
348 (time_waited.tv_usec < timeout.tv_usec)))
350 return (cu->cu_error.re_status = RPC_TIMEDOUT);
353 * buggy in other cases because time_waited is not being
359 cu->cu_error.re_errno = errno;
360 return (cu->cu_error.re_status = RPC_CANTRECV);
364 fromlen = sizeof (struct sockaddr);
365 inlen = recvfrom (cu->cu_sock, cu->cu_inbuf,
366 (int) cu->cu_recvsz, 0,
367 (struct sockaddr *) &from, &fromlen);
369 while (inlen < 0 && errno == EINTR);
372 if (errno == EWOULDBLOCK)
374 cu->cu_error.re_errno = errno;
375 return (cu->cu_error.re_status = RPC_CANTRECV);
380 /* see if reply transaction id matches sent id.
381 Don't do this if we only wait for a replay */
383 && (*((u_int32_t *) (cu->cu_inbuf))
384 != *((u_int32_t *) (cu->cu_outbuf))))
386 /* we now assume we have the proper reply */
391 * now decode and validate the response
393 xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
394 ok = xdr_replymsg (&reply_xdrs, &reply_msg);
395 /* XDR_DESTROY(&reply_xdrs); save a few cycles on noop destroy */
398 _seterr_reply (&reply_msg, &(cu->cu_error));
399 if (cu->cu_error.re_status == RPC_SUCCESS)
401 if (!AUTH_VALIDATE (cl->cl_auth,
402 &reply_msg.acpted_rply.ar_verf))
404 cu->cu_error.re_status = RPC_AUTHERROR;
405 cu->cu_error.re_why = AUTH_INVALIDRESP;
407 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
409 xdrs->x_op = XDR_FREE;
410 (void) xdr_opaque_auth (xdrs,
411 &(reply_msg.acpted_rply.ar_verf));
413 } /* end successful completion */
416 /* maybe our credentials need to be refreshed ... */
417 if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
422 } /* end of unsuccessful completion */
423 } /* end of valid reply message */
426 cu->cu_error.re_status = RPC_CANTDECODERES;
428 return cu->cu_error.re_status;
432 clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
434 struct cu_data *cu = (struct cu_data *) cl->cl_private;
436 *errp = cu->cu_error;
441 clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
443 struct cu_data *cu = (struct cu_data *) cl->cl_private;
444 XDR *xdrs = &(cu->cu_outxdrs);
446 xdrs->x_op = XDR_FREE;
447 return (*xdr_res) (xdrs, res_ptr);
456 clntudp_control (CLIENT *cl, int request, char *info)
458 struct cu_data *cu = (struct cu_data *) cl->cl_private;
463 cu->cu_closeit = TRUE;
465 case CLSET_FD_NCLOSE:
466 cu->cu_closeit = FALSE;
469 cu->cu_total = *(struct timeval *) info;
472 *(struct timeval *) info = cu->cu_total;
474 case CLSET_RETRY_TIMEOUT:
475 cu->cu_wait = *(struct timeval *) info;
477 case CLGET_RETRY_TIMEOUT:
478 *(struct timeval *) info = cu->cu_wait;
480 case CLGET_SERVER_ADDR:
481 *(struct sockaddr_in *) info = cu->cu_raddr;
484 *(int *)info = cu->cu_sock;
488 * use the knowledge that xid is the
489 * first element in the call structure *.
490 * This will get the xid of the PREVIOUS call
492 *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
495 /* This will set the xid of the NEXT call */
496 *(u_long *)cu->cu_outbuf = htonl(*(u_long *)info - 1);
497 /* decrement by 1 as clntudp_call() increments once */
500 * This RELIES on the information that, in the call body,
501 * the version number field is the fifth field from the
502 * begining of the RPC header. MUST be changed if the
503 * call_struct is changed
505 *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
506 4 * BYTES_PER_XDR_UNIT));
509 *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
510 = htonl(*(u_long *)info);
514 * This RELIES on the information that, in the call body,
515 * the program number field is the field from the
516 * begining of the RPC header. MUST be changed if the
517 * call_struct is changed
519 *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
520 3 * BYTES_PER_XDR_UNIT));
523 *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
524 = htonl(*(u_long *)info);
526 /* The following are only possible with TI-RPC */
529 case CLSET_PUSH_TIMOD:
530 case CLSET_POP_TIMOD:
538 clntudp_destroy (CLIENT *cl)
540 struct cu_data *cu = (struct cu_data *) cl->cl_private;
544 (void) __close (cu->cu_sock);
546 XDR_DESTROY (&(cu->cu_outxdrs));
547 mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
548 mem_free ((caddr_t) cl, sizeof (CLIENT));