1 /* @(#)pmap_rmt.c 2.2 88/08/01 4.0 RPCSRC */
2 /*
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.
9 *
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.
13 *
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.
17 *
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.
21 *
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
24 * Sun has been advised of the possibility of such damages.
25 *
26 * Sun Microsystems, Inc.
27 * 2550 Garcia Avenue
28 * Mountain View, California 94043
29 */
30 #if !defined(lint) && defined(SCCSIDS)
31 static char sccsid[] = "@(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";
32 #endif
33
34 /*
35 * pmap_rmt.c
36 * Client interface to pmap rpc service.
37 * remote call and broadcast service
38 *
39 * Copyright (C) 1984, Sun Microsystems, Inc.
40 */
41
42 #include <rpc/rpc.h>
43 #include <rpc/pmap_prot.h>
44 #include <rpc/pmap_clnt.h>
45 #include <rpc/pmap_rmt.h>
46 #include <sys/socket.h>
47 #include <stdio.h>
48 #include <errno.h>
49 #include <net/if.h>
50 #include <sys/ioctl.h>
51 #include <arpa/inet.h>
52 #define MAX_BROADCAST_SIZE 1400
53
54 extern int errno;
55 static struct timeval timeout = { 3, 0 };
56
57
58 /*
59 * pmapper remote-call-service interface.
60 * This routine is used to call the pmapper remote call service
61 * which will look up a service program in the port maps, and then
62 * remotely call that routine with the given parameters. This allows
63 * programs to do a lookup and call in one step.
64 */
65 enum clnt_stat
pmap_rmtcall(addr,prog,vers,proc,xdrargs,argsp,xdrres,resp,tout,port_ptr)66 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
67 struct sockaddr_in *addr;
68 u_long prog, vers, proc;
69 xdrproc_t xdrargs, xdrres;
70 caddr_t argsp, resp;
71 struct timeval tout;
72 u_long *port_ptr;
73 {
74 int socket = -1;
75 register CLIENT *client;
76 struct rmtcallargs a;
77 struct rmtcallres r;
78 enum clnt_stat stat;
79
80 addr->sin_port = htons(PMAPPORT);
81 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
82 if (client != (CLIENT *)NULL) {
83 a.prog = prog;
84 a.vers = vers;
85 a.proc = proc;
86 a.args_ptr = argsp;
87 a.xdr_args = xdrargs;
88 r.port_ptr = port_ptr;
89 r.results_ptr = resp;
90 r.xdr_results = xdrres;
91 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a,
92 xdr_rmtcallres, &r, tout);
93 CLNT_DESTROY(client);
94 } else {
95 stat = RPC_FAILED;
96 }
97 (void)close(socket);
98 addr->sin_port = 0;
99 return (stat);
100 }
101
102
103 /*
104 * XDR remote call arguments
105 * written for XDR_ENCODE direction only
106 */
107 bool_t
xdr_rmtcall_args(xdrs,cap)108 xdr_rmtcall_args(xdrs, cap)
109 register XDR *xdrs;
110 register struct rmtcallargs *cap;
111 {
112 u_int lenposition, argposition, position;
113
114 if (xdr_u_long(xdrs, &(cap->prog)) &&
115 xdr_u_long(xdrs, &(cap->vers)) &&
116 xdr_u_long(xdrs, &(cap->proc))) {
117 lenposition = XDR_GETPOS(xdrs);
118 if (! xdr_u_long(xdrs, &(cap->arglen)))
119 return (FALSE);
120 argposition = XDR_GETPOS(xdrs);
121 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
122 return (FALSE);
123 position = XDR_GETPOS(xdrs);
124 cap->arglen = (u_long)position - (u_long)argposition;
125 XDR_SETPOS(xdrs, lenposition);
126 if (! xdr_u_long(xdrs, &(cap->arglen)))
127 return (FALSE);
128 XDR_SETPOS(xdrs, position);
129 return (TRUE);
130 }
131 return (FALSE);
132 }
133
134 /*
135 * XDR remote call results
136 * written for XDR_DECODE direction only
137 */
138 bool_t
xdr_rmtcallres(xdrs,crp)139 xdr_rmtcallres(xdrs, crp)
140 register XDR *xdrs;
141 register struct rmtcallres *crp;
142 {
143 caddr_t port_ptr;
144
145 port_ptr = (caddr_t)crp->port_ptr;
146 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),
147 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
148 crp->port_ptr = (u_long *)port_ptr;
149 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
150 }
151 return (FALSE);
152 }
153
154
155 /*
156 * The following is kludged-up support for simple rpc broadcasts.
157 * Someday a large, complicated system will replace these trivial
158 * routines which only support udp/ip .
159 */
160
161 static int
getbroadcastnets(addrs,sock,buf)162 getbroadcastnets(addrs, sock, buf)
163 struct in_addr *addrs;
164 int sock; /* any valid socket will do */
165 char *buf; /* why allocxate more when we can use existing... */
166 {
167 struct ifconf ifc;
168 struct ifreq ifreq, *ifr;
169 struct sockaddr_in *sin;
170 char *cp, *cplim;
171 int n, i = 0;
172
173 ifc.ifc_len = UDPMSGSIZE;
174 ifc.ifc_buf = buf;
175 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
176 perror("broadcast: ioctl (get interface configuration)");
177 return (0);
178 }
179 #define max(a, b) (a > b ? a : b)
180 #define size(p) max((p).sa_len, sizeof(p))
181 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
182 for (cp = buf; cp < cplim;
183 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
184 ifr = (struct ifreq *)cp;
185 if (ifr->ifr_addr.sa_family != AF_INET)
186 continue;
187 ifreq = *ifr;
188 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
189 perror("broadcast: ioctl (get interface flags)");
190 continue;
191 }
192 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
193 (ifreq.ifr_flags & IFF_UP)) {
194 sin = (struct sockaddr_in *)&ifr->ifr_addr;
195 #ifdef SIOCGIFBRDADDR /* 4.3BSD */
196 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
197 addrs[i++] =
198 inet_makeaddr(inet_netof(sin->sin_addr),
199 INADDR_ANY);
200 } else {
201 addrs[i++] = ((struct sockaddr_in*)
202 &ifreq.ifr_addr)->sin_addr;
203 }
204 #else /* 4.2 BSD */
205 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr),
206 INADDR_ANY);
207 #endif
208 }
209 }
210 return (i);
211 }
212
213 typedef bool_t (*resultproc_t)();
214
215 enum clnt_stat
clnt_broadcast(prog,vers,proc,xargs,argsp,xresults,resultsp,eachresult)216 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
217 u_long prog; /* program number */
218 u_long vers; /* version number */
219 u_long proc; /* procedure number */
220 xdrproc_t xargs; /* xdr routine for args */
221 caddr_t argsp; /* pointer to args */
222 xdrproc_t xresults; /* xdr routine for results */
223 caddr_t resultsp; /* pointer to results */
224 resultproc_t eachresult; /* call with each result obtained */
225 {
226 enum clnt_stat stat;
227 AUTH *unix_auth = authunix_create_default();
228 XDR xdr_stream;
229 register XDR *xdrs = &xdr_stream;
230 int outlen, inlen, fromlen, nets;
231 register int sock;
232 int on = 1;
233 #ifdef FD_SETSIZE
234 fd_set mask;
235 fd_set readfds;
236 #else
237 int readfds;
238 register int mask;
239 #endif /* def FD_SETSIZE */
240 register int i;
241 bool_t done = FALSE;
242 register u_long xid;
243 u_long port;
244 struct in_addr addrs[20];
245 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
246 struct rmtcallargs a;
247 struct rmtcallres r;
248 struct rpc_msg msg;
249 struct timeval t;
250 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
251
252 /*
253 * initialization: create a socket, a broadcast address, and
254 * preserialize the arguments into a send buffer.
255 */
256 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
257 perror("Cannot create socket for broadcast rpc");
258 stat = RPC_CANTSEND;
259 goto done_broad;
260 }
261 #ifdef SO_BROADCAST
262 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
263 perror("Cannot set socket option SO_BROADCAST");
264 stat = RPC_CANTSEND;
265 goto done_broad;
266 }
267 #endif /* def SO_BROADCAST */
268 #ifdef FD_SETSIZE
269 FD_ZERO(&mask);
270 FD_SET(sock, &mask);
271 #else
272 mask = (1 << sock);
273 #endif /* def FD_SETSIZE */
274 nets = getbroadcastnets(addrs, sock, inbuf);
275 bzero((char *)&baddr, sizeof (baddr));
276 baddr.sin_family = AF_INET;
277 baddr.sin_port = htons(PMAPPORT);
278 baddr.sin_addr.s_addr = htonl(INADDR_ANY);
279 /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
280 (void)gettimeofday(&t, (struct timezone *)0);
281 msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec;
282 t.tv_usec = 0;
283 msg.rm_direction = CALL;
284 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
285 msg.rm_call.cb_prog = PMAPPROG;
286 msg.rm_call.cb_vers = PMAPVERS;
287 msg.rm_call.cb_proc = PMAPPROC_CALLIT;
288 msg.rm_call.cb_cred = unix_auth->ah_cred;
289 msg.rm_call.cb_verf = unix_auth->ah_verf;
290 a.prog = prog;
291 a.vers = vers;
292 a.proc = proc;
293 a.xdr_args = xargs;
294 a.args_ptr = argsp;
295 r.port_ptr = &port;
296 r.xdr_results = xresults;
297 r.results_ptr = resultsp;
298 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
299 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
300 stat = RPC_CANTENCODEARGS;
301 goto done_broad;
302 }
303 outlen = (int)xdr_getpos(xdrs);
304 xdr_destroy(xdrs);
305 /*
306 * Basic loop: broadcast a packet and wait a while for response(s).
307 * The response timeout grows larger per iteration.
308 */
309 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
310 for (i = 0; i < nets; i++) {
311 baddr.sin_addr = addrs[i];
312 if (sendto(sock, outbuf, outlen, 0,
313 (struct sockaddr *)&baddr,
314 sizeof (struct sockaddr)) != outlen) {
315 perror("Cannot send broadcast packet");
316 stat = RPC_CANTSEND;
317 goto done_broad;
318 }
319 }
320 if (eachresult == NULL) {
321 stat = RPC_SUCCESS;
322 goto done_broad;
323 }
324 recv_again:
325 msg.acpted_rply.ar_verf = _null_auth;
326 msg.acpted_rply.ar_results.where = (caddr_t)&r;
327 msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
328 readfds = mask;
329 switch (select(_rpc_dtablesize(), &readfds, (int *)NULL,
330 (int *)NULL, &t)) {
331
332 case 0: /* timed out */
333 stat = RPC_TIMEDOUT;
334 continue;
335
336 case -1: /* some kind of error */
337 if (errno == EINTR)
338 goto recv_again;
339 perror("Broadcast select problem");
340 stat = RPC_CANTRECV;
341 goto done_broad;
342
343 } /* end of select results switch */
344 try_again:
345 fromlen = sizeof(struct sockaddr);
346 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0,
347 (struct sockaddr *)&raddr, &fromlen);
348 if (inlen < 0) {
349 if (errno == EINTR)
350 goto try_again;
351 perror("Cannot receive reply to broadcast");
352 stat = RPC_CANTRECV;
353 goto done_broad;
354 }
355 if (inlen < sizeof(u_long))
356 goto recv_again;
357 /*
358 * see if reply transaction id matches sent id.
359 * If so, decode the results.
360 */
361 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
362 if (xdr_replymsg(xdrs, &msg)) {
363 if ((msg.rm_xid == xid) &&
364 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
365 (msg.acpted_rply.ar_stat == SUCCESS)) {
366 raddr.sin_port = htons((u_short)port);
367 done = (*eachresult)(resultsp, &raddr);
368 }
369 /* otherwise, we just ignore the errors ... */
370 } else {
371 #ifdef notdef
372 /* some kind of deserialization problem ... */
373 if (msg.rm_xid == xid)
374 fprintf(stderr, "Broadcast deserialization problem");
375 /* otherwise, just random garbage */
376 #endif
377 }
378 xdrs->x_op = XDR_FREE;
379 msg.acpted_rply.ar_results.proc = xdr_void;
380 (void)xdr_replymsg(xdrs, &msg);
381 (void)(*xresults)(xdrs, resultsp);
382 xdr_destroy(xdrs);
383 if (done) {
384 stat = RPC_SUCCESS;
385 goto done_broad;
386 } else {
387 goto recv_again;
388 }
389 }
390 done_broad:
391 (void)close(sock);
392 AUTH_DESTROY(unix_auth);
393 return (stat);
394 }
395
396