1 /* $OpenBSD: pmap_rmt.c,v 1.25 2005/08/08 08:05:35 espie Exp $ */
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
31 /*
32 * pmap_rmt.c
33 * Client interface to pmap rpc service.
34 * remote call and broadcast service
35 *
36 * Copyright (C) 1984, Sun Microsystems, Inc.
37 */
38
39 #include <rpc/rpc.h>
40 #include <rpc/pmap_prot.h>
41 #include <rpc/pmap_clnt.h>
42 #include <rpc/pmap_rmt.h>
43 #include <sys/socket.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <unistd.h>
47 #include <errno.h>
48 #include <string.h>
49 #include <net/if.h>
50 #include <sys/ioctl.h>
51 #include <arpa/inet.h>
52 #include <ifaddrs.h>
53 #define MAX_BROADCAST_SIZE 1400
54
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(struct sockaddr_in * addr,u_long prog,u_long vers,u_long proc,xdrproc_t xdrargs,caddr_t argsp,xdrproc_t xdrres,caddr_t resp,struct timeval tout,u_long * port_ptr)66 pmap_rmtcall(struct sockaddr_in *addr, u_long prog, u_long vers, u_long proc,
67 xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp,
68 struct timeval tout, u_long *port_ptr)
69 {
70 int sock = -1;
71 CLIENT *client;
72 struct rmtcallargs a;
73 struct rmtcallres r;
74 enum clnt_stat stat;
75
76 addr->sin_port = htons(PMAPPORT);
77 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock);
78 if (client != NULL) {
79 a.prog = prog;
80 a.vers = vers;
81 a.proc = proc;
82 a.args_ptr = argsp;
83 a.xdr_args = xdrargs;
84 r.port_ptr = port_ptr;
85 r.results_ptr = resp;
86 r.xdr_results = xdrres;
87 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a,
88 xdr_rmtcallres, &r, tout);
89 CLNT_DESTROY(client);
90 } else {
91 stat = RPC_FAILED;
92 }
93 if (sock != -1)
94 (void)close(sock);
95 addr->sin_port = 0;
96 return (stat);
97 }
98
99
100 /*
101 * XDR remote call arguments
102 * written for XDR_ENCODE direction only
103 */
104 bool_t
xdr_rmtcall_args(XDR * xdrs,struct rmtcallargs * cap)105 xdr_rmtcall_args(XDR *xdrs, struct rmtcallargs *cap)
106 {
107 u_int lenposition, argposition, position;
108
109 if (xdr_u_long(xdrs, &(cap->prog)) &&
110 xdr_u_long(xdrs, &(cap->vers)) &&
111 xdr_u_long(xdrs, &(cap->proc))) {
112 lenposition = XDR_GETPOS(xdrs);
113 if (! xdr_u_long(xdrs, &(cap->arglen)))
114 return (FALSE);
115 argposition = XDR_GETPOS(xdrs);
116 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
117 return (FALSE);
118 position = XDR_GETPOS(xdrs);
119 cap->arglen = (u_long)position - (u_long)argposition;
120 XDR_SETPOS(xdrs, lenposition);
121 if (! xdr_u_long(xdrs, &(cap->arglen)))
122 return (FALSE);
123 XDR_SETPOS(xdrs, position);
124 return (TRUE);
125 }
126 return (FALSE);
127 }
128
129 /*
130 * XDR remote call results
131 * written for XDR_DECODE direction only
132 */
133 bool_t
xdr_rmtcallres(XDR * xdrs,struct rmtcallres * crp)134 xdr_rmtcallres(XDR *xdrs, struct rmtcallres *crp)
135 {
136 caddr_t port_ptr;
137
138 port_ptr = (caddr_t)crp->port_ptr;
139 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),
140 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
141 crp->port_ptr = (u_long *)port_ptr;
142 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
143 }
144 return (FALSE);
145 }
146
147
148 /*
149 * The following is kludged-up support for simple rpc broadcasts.
150 * Someday a large, complicated system will replace these trivial
151 * routines which only support udp/ip .
152 */
153
154 static int
newgetbroadcastnets(struct in_addr ** addrsp,int sock)155 newgetbroadcastnets(struct in_addr **addrsp,
156 int sock) /* any valid socket will do */
157 {
158 struct ifaddrs *ifap, *ifa;
159 struct sockaddr_in *sin;
160 struct in_addr *addrs;
161 int i = 0, n = 0;
162
163 if (getifaddrs(&ifap) != 0)
164 return 0;
165
166 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
167 if (ifa->ifa_addr->sa_family != AF_INET)
168 continue;
169 if ((ifa->ifa_flags & IFF_BROADCAST) &&
170 (ifa->ifa_flags & IFF_UP) &&
171 ifa->ifa_broadaddr &&
172 ifa->ifa_broadaddr->sa_family == AF_INET) {
173 n++;
174 }
175 }
176
177 addrs = (struct in_addr *)malloc(n * sizeof(*addrs));
178 if (addrs == NULL) {
179 freeifaddrs(ifap);
180 return 0;
181 }
182
183 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
184 if (ifa->ifa_addr->sa_family != AF_INET)
185 continue;
186 if ((ifa->ifa_flags & IFF_BROADCAST) &&
187 (ifa->ifa_flags & IFF_UP) &&
188 ifa->ifa_broadaddr &&
189 ifa->ifa_broadaddr->sa_family == AF_INET) {
190 sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
191 addrs[i++] = sin->sin_addr;
192 }
193 }
194
195 freeifaddrs(ifap);
196 *addrsp = addrs;
197 return i;
198 }
199
200 typedef bool_t (*resultproc_t)();
201
202 enum clnt_stat
clnt_broadcast(u_long prog,u_long vers,u_long proc,xdrproc_t xargs,caddr_t argsp,xdrproc_t xresults,caddr_t resultsp,resultproc_t eachresult)203 clnt_broadcast(u_long prog, /* program number */
204 u_long vers, /* version number */
205 u_long proc, /* procedure number */
206 xdrproc_t xargs, /* xdr routine for args */
207 caddr_t argsp, /* pointer to args */
208 xdrproc_t xresults, /* xdr routine for results */
209 caddr_t resultsp, /* pointer to results */
210 resultproc_t eachresult) /* call with each result obtained */
211 {
212 enum clnt_stat stat;
213 AUTH *unix_auth = authunix_create_default();
214 XDR xdr_stream;
215 XDR *xdrs = &xdr_stream;
216 int outlen, inlen, nets;
217 socklen_t fromlen;
218 int sock = -1;
219 int on = 1;
220 struct pollfd pfd[1];
221 int i;
222 int timo;
223 bool_t done = FALSE;
224 u_long xid;
225 u_long port;
226 struct in_addr *addrs = NULL;
227 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
228 struct rmtcallargs a;
229 struct rmtcallres r;
230 struct rpc_msg msg;
231 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
232
233 /*
234 * initialization: create a socket, a broadcast address, and
235 * preserialize the arguments into a send buffer.
236 */
237 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
238 stat = RPC_CANTSEND;
239 goto done_broad;
240 }
241 #ifdef SO_BROADCAST
242 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
243 stat = RPC_CANTSEND;
244 goto done_broad;
245 }
246 #endif /* def SO_BROADCAST */
247
248 pfd[0].fd = sock;
249 pfd[0].events = POLLIN;
250
251 nets = newgetbroadcastnets(&addrs, sock);
252 if (nets == 0) {
253 stat = RPC_CANTSEND;
254 goto done_broad;
255 }
256
257 memset(&baddr, 0, sizeof (baddr));
258 baddr.sin_len = sizeof(struct sockaddr_in);
259 baddr.sin_family = AF_INET;
260 baddr.sin_port = htons(PMAPPORT);
261 baddr.sin_addr.s_addr = htonl(INADDR_ANY);
262 msg.rm_xid = xid = arc4random();
263 msg.rm_direction = CALL;
264 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
265 msg.rm_call.cb_prog = PMAPPROG;
266 msg.rm_call.cb_vers = PMAPVERS;
267 msg.rm_call.cb_proc = PMAPPROC_CALLIT;
268 msg.rm_call.cb_cred = unix_auth->ah_cred;
269 msg.rm_call.cb_verf = unix_auth->ah_verf;
270 a.prog = prog;
271 a.vers = vers;
272 a.proc = proc;
273 a.xdr_args = xargs;
274 a.args_ptr = argsp;
275 r.port_ptr = &port;
276 r.xdr_results = xresults;
277 r.results_ptr = resultsp;
278 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
279 if (!xdr_callmsg(xdrs, &msg) || !xdr_rmtcall_args(xdrs, &a)) {
280 stat = RPC_CANTENCODEARGS;
281 goto done_broad;
282 }
283 outlen = (int)xdr_getpos(xdrs);
284 xdr_destroy(xdrs);
285
286 /*
287 * Basic loop: broadcast a packet and wait a while for response(s).
288 * The response timeout grows larger per iteration.
289 *
290 * XXX This will loop about 5 times the stop. If there are
291 * lots of signals being received by the process it will quit
292 * send them all in one quick burst, not paying attention to
293 * the intended function of sending them slowly over half a
294 * minute or so
295 */
296 for (timo = 4000; timo <= 14000; timo += 2000) {
297 for (i = 0; i < nets; i++) {
298 baddr.sin_addr = addrs[i];
299 if (sendto(sock, outbuf, outlen, 0,
300 (struct sockaddr *)&baddr,
301 sizeof (struct sockaddr)) != outlen) {
302 stat = RPC_CANTSEND;
303 goto done_broad;
304 }
305 }
306 if (eachresult == NULL) {
307 stat = RPC_SUCCESS;
308 goto done_broad;
309 }
310 recv_again:
311 msg.acpted_rply.ar_verf = _null_auth;
312 msg.acpted_rply.ar_results.where = (caddr_t)&r;
313 msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
314
315 switch (poll(pfd, 1, timo)) {
316 case 0: /* timed out */
317 stat = RPC_TIMEDOUT;
318 continue;
319 case 1:
320 if (pfd[0].revents & POLLNVAL)
321 errno = EBADF;
322 else if (pfd[0].revents & POLLERR)
323 errno = EIO;
324 else
325 break;
326 /* FALLTHROUGH */
327 case -1: /* some kind of error */
328 if (errno == EINTR)
329 goto recv_again;
330 stat = RPC_CANTRECV;
331 goto done_broad;
332 }
333 try_again:
334 fromlen = sizeof(struct sockaddr);
335 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0,
336 (struct sockaddr *)&raddr, &fromlen);
337 if (inlen < 0) {
338 if (errno == EINTR)
339 goto try_again;
340 stat = RPC_CANTRECV;
341 goto done_broad;
342 }
343 if (inlen < sizeof(u_int32_t))
344 goto recv_again;
345 /*
346 * see if reply transaction id matches sent id.
347 * If so, decode the results.
348 */
349 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
350 if (xdr_replymsg(xdrs, &msg)) {
351 if ((msg.rm_xid == xid) &&
352 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
353 (msg.acpted_rply.ar_stat == SUCCESS)) {
354 raddr.sin_port = htons((u_short)port);
355 done = (*eachresult)(resultsp, &raddr);
356 }
357 /* otherwise, we just ignore the errors ... */
358 }
359 xdrs->x_op = XDR_FREE;
360 msg.acpted_rply.ar_results.proc = xdr_void;
361 (void)xdr_replymsg(xdrs, &msg);
362 (void)(*xresults)(xdrs, resultsp);
363 xdr_destroy(xdrs);
364 if (done) {
365 stat = RPC_SUCCESS;
366 goto done_broad;
367 } else {
368 goto recv_again;
369 }
370 }
371 done_broad:
372 if (addrs)
373 free(addrs);
374 if (sock >= 0)
375 (void)close(sock);
376 AUTH_DESTROY(unix_auth);
377 return (stat);
378 }
379