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 0
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 <unistd.h>
43 #include <string.h>
44 #include "rpc_private.h"
45 #include <rpc/pmap_prot.h>
46 #include <rpc/pmap_clnt.h>
47 #include <rpc/pmap_rmt.h>
48 #include <sys/poll.h>
49 #include <sys/socket.h>
50 #include <stdio.h>
51 #include <errno.h>
52 #include <sys/param.h> /* Ultrix needs before net/if --roland@gnu */
53 #include <net/if.h>
54 #include <sys/ioctl.h>
55 #include <arpa/inet.h>
56 #define MAX_BROADCAST_SIZE 1400
57
58 static const struct timeval timeout = {3, 0};
59
60 /*
61 * pmapper remote-call-service interface.
62 * This routine is used to call the pmapper remote call service
63 * which will look up a service program in the port maps, and then
64 * remotely call that routine with the given parameters. This allows
65 * programs to do a lookup and call in one step.
66 */
67 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)68 pmap_rmtcall (struct sockaddr_in *addr, u_long prog, u_long vers, u_long proc,
69 xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp,
70 struct timeval tout, u_long *port_ptr)
71 {
72 int _socket = -1;
73 CLIENT *client;
74 struct rmtcallargs a;
75 struct rmtcallres r;
76 enum clnt_stat stat;
77
78 addr->sin_port = htons (PMAPPORT);
79 client = clntudp_create (addr, PMAPPROG, PMAPVERS, timeout, &_socket);
80 if (client != (CLIENT *) NULL)
81 {
82 a.prog = prog;
83 a.vers = vers;
84 a.proc = proc;
85 a.args_ptr = argsp;
86 a.xdr_args = xdrargs;
87 r.port_ptr = port_ptr;
88 r.results_ptr = resp;
89 r.xdr_results = xdrres;
90 stat = CLNT_CALL (client, PMAPPROC_CALLIT, (xdrproc_t)xdr_rmtcall_args,
91 (caddr_t)&a, (xdrproc_t)xdr_rmtcallres,
92 (caddr_t)&r, tout);
93 CLNT_DESTROY (client);
94 }
95 else
96 {
97 stat = RPC_FAILED;
98 }
99 /* (void)close(_socket); CLNT_DESTROY already closed it */
100 addr->sin_port = 0;
101 return stat;
102 }
103
104
105 /*
106 * XDR remote call arguments
107 * written for XDR_ENCODE direction only
108 */
109 bool_t
xdr_rmtcall_args(XDR * xdrs,struct rmtcallargs * cap)110 xdr_rmtcall_args (XDR *xdrs, 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 {
118 u_long dummy_arglen = 0;
119 lenposition = XDR_GETPOS (xdrs);
120 if (!xdr_u_long (xdrs, &dummy_arglen))
121 return FALSE;
122 argposition = XDR_GETPOS (xdrs);
123 if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
124 return FALSE;
125 position = XDR_GETPOS (xdrs);
126 cap->arglen = (u_long) position - (u_long) argposition;
127 XDR_SETPOS (xdrs, lenposition);
128 if (!xdr_u_long (xdrs, &(cap->arglen)))
129 return FALSE;
130 XDR_SETPOS (xdrs, position);
131 return TRUE;
132 }
133 return FALSE;
134 }
libc_hidden_def(xdr_rmtcall_args)135 libc_hidden_def(xdr_rmtcall_args)
136
137 /*
138 * XDR remote call results
139 * written for XDR_DECODE direction only
140 */
141 bool_t
142 xdr_rmtcallres (XDR *xdrs, struct rmtcallres *crp)
143 {
144 caddr_t port_ptr;
145
146 port_ptr = (caddr_t) crp->port_ptr;
147 if (xdr_reference (xdrs, &port_ptr, sizeof (u_long), (xdrproc_t) xdr_u_long)
148 && xdr_u_long (xdrs, &crp->resultslen))
149 {
150 crp->port_ptr = (u_long *) port_ptr;
151 return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
152 }
153 return FALSE;
154 }
libc_hidden_def(xdr_rmtcallres)155 libc_hidden_def(xdr_rmtcallres)
156
157
158 /*
159 * The following is kludged-up support for simple rpc broadcasts.
160 * Someday a large, complicated system will replace these trivial
161 * routines which only support udp/ip .
162 */
163
164 static int
165 internal_function
166 getbroadcastnets (struct in_addr *addrs, int sock, char *buf)
167 /* int sock: any valid socket will do */
168 /* char *buf: why allocate more when we can use existing... */
169 {
170 struct ifconf ifc;
171 struct ifreq ifreq, *ifr;
172 struct sockaddr_in *sin;
173 int n, i;
174
175 ifc.ifc_len = UDPMSGSIZE;
176 ifc.ifc_buf = buf;
177 if (ioctl (sock, SIOCGIFCONF, (char *) &ifc) < 0)
178 {
179 perror (_("broadcast: ioctl (get interface configuration)"));
180 return (0);
181 }
182 ifr = ifc.ifc_req;
183 for (i = 0, n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
184 {
185 ifreq = *ifr;
186 if (ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
187 {
188 perror (_("broadcast: ioctl (get interface flags)"));
189 continue;
190 }
191 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
192 (ifreq.ifr_flags & IFF_UP) &&
193 ifr->ifr_addr.sa_family == AF_INET)
194 {
195 sin = (struct sockaddr_in *) &ifr->ifr_addr;
196 #ifdef SIOCGIFBRDADDR /* 4.3BSD */
197 if (ioctl (sock, SIOCGIFBRDADDR, (char *) &ifreq) < 0)
198 {
199 addrs[i++] = inet_makeaddr (inet_netof
200 /* Changed to pass struct instead of s_addr member
201 by roland@gnu. */
202 (sin->sin_addr), INADDR_ANY);
203 }
204 else
205 {
206 addrs[i++] = ((struct sockaddr_in *)
207 &ifreq.ifr_addr)->sin_addr;
208 }
209 #else /* 4.2 BSD */
210 addrs[i++] = inet_makeaddr (inet_netof
211 (sin->sin_addr.s_addr), INADDR_ANY);
212 #endif
213 }
214 }
215 return i;
216 }
217
218
219 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)220 clnt_broadcast (
221 u_long prog, /* program number */
222 u_long vers, /* version number */
223 u_long proc, /* procedure number */
224 xdrproc_t xargs, /* xdr routine for args */
225 caddr_t argsp, /* pointer to args */
226 xdrproc_t xresults, /* xdr routine for results */
227 caddr_t resultsp, /* pointer to results */
228 resultproc_t eachresult /* call with each result obtained */)
229 {
230 enum clnt_stat stat = RPC_FAILED;
231 AUTH *unix_auth = authunix_create_default ();
232 XDR xdr_stream;
233 XDR *xdrs = &xdr_stream;
234 struct timeval t;
235 int outlen, inlen, nets;
236 socklen_t fromlen;
237 int sock;
238 int on = 1;
239 struct pollfd fd;
240 int milliseconds;
241 int i;
242 bool_t done = FALSE;
243 u_long xid;
244 u_long port;
245 struct in_addr addrs[20];
246 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
247 struct rmtcallargs a;
248 struct rmtcallres r;
249 struct rpc_msg msg;
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 {
258 perror (_("Cannot create socket for broadcast rpc"));
259 stat = RPC_CANTSEND;
260 goto done_broad;
261 }
262 #ifdef SO_BROADCAST
263 if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
264 {
265 perror (_("Cannot set socket option SO_BROADCAST"));
266 stat = RPC_CANTSEND;
267 goto done_broad;
268 }
269 #endif /* def SO_BROADCAST */
270 fd.fd = sock;
271 fd.events = POLLIN;
272 nets = getbroadcastnets (addrs, sock, inbuf);
273 memset ((char *) &baddr, 0, sizeof (baddr));
274 baddr.sin_family = AF_INET;
275 baddr.sin_port = htons (PMAPPORT);
276 baddr.sin_addr.s_addr = htonl (INADDR_ANY);
277 /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
278 msg.rm_xid = xid = _create_xid ();
279 t.tv_usec = 0;
280 msg.rm_direction = CALL;
281 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
282 msg.rm_call.cb_prog = PMAPPROG;
283 msg.rm_call.cb_vers = PMAPVERS;
284 msg.rm_call.cb_proc = PMAPPROC_CALLIT;
285 msg.rm_call.cb_cred = unix_auth->ah_cred;
286 msg.rm_call.cb_verf = unix_auth->ah_verf;
287 a.prog = prog;
288 a.vers = vers;
289 a.proc = proc;
290 a.xdr_args = xargs;
291 a.args_ptr = argsp;
292 r.port_ptr = &port;
293 r.xdr_results = xresults;
294 r.results_ptr = resultsp;
295 xdrmem_create (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
296 if ((!xdr_callmsg (xdrs, &msg)) || (!xdr_rmtcall_args (xdrs, &a)))
297 {
298 stat = RPC_CANTENCODEARGS;
299 goto done_broad;
300 }
301 outlen = (int) xdr_getpos (xdrs);
302 xdr_destroy (xdrs);
303 /*
304 * Basic loop: broadcast a packet and wait a while for response(s).
305 * The response timeout grows larger per iteration.
306 */
307 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
308 {
309 for (i = 0; i < nets; i++)
310 {
311 baddr.sin_addr = addrs[i];
312 if (sendto (sock, outbuf, outlen, 0,
313 (struct sockaddr *) &baddr,
314 sizeof (struct sockaddr)) != outlen)
315 {
316 perror (_("Cannot send broadcast packet"));
317 stat = RPC_CANTSEND;
318 goto done_broad;
319 }
320 }
321 if (eachresult == NULL)
322 {
323 stat = RPC_SUCCESS;
324 goto done_broad;
325 }
326 recv_again:
327 msg.acpted_rply.ar_verf = _null_auth;
328 msg.acpted_rply.ar_results.where = (caddr_t) & r;
329 msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_rmtcallres;
330 milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
331 switch (poll(&fd, 1, milliseconds))
332 {
333
334 case 0: /* timed out */
335 stat = RPC_TIMEDOUT;
336 continue;
337
338 case -1: /* some kind of error */
339 if (errno == EINTR)
340 goto recv_again;
341 perror (_("Broadcast poll problem"));
342 stat = RPC_CANTRECV;
343 goto done_broad;
344
345 } /* end of poll results switch */
346 try_again:
347 fromlen = sizeof (struct sockaddr);
348 inlen = recvfrom (sock, inbuf, UDPMSGSIZE, 0,
349 (struct sockaddr *) &raddr, &fromlen);
350 if (inlen < 0)
351 {
352 if (errno == EINTR)
353 goto try_again;
354 perror (_("Cannot receive reply to broadcast"));
355 stat = RPC_CANTRECV;
356 goto done_broad;
357 }
358 if ((size_t) inlen < sizeof (u_long))
359 goto recv_again;
360 /*
361 * see if reply transaction id matches sent id.
362 * If so, decode the results.
363 */
364 xdrmem_create (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
365 if (xdr_replymsg (xdrs, &msg))
366 {
367 if (((u_int32_t) msg.rm_xid == (u_int32_t) xid) &&
368 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
369 (msg.acpted_rply.ar_stat == SUCCESS))
370 {
371 raddr.sin_port = htons ((u_short) port);
372 done = (*eachresult) (resultsp, &raddr);
373 }
374 /* otherwise, we just ignore the errors ... */
375 }
376 else
377 {
378 #ifdef notdef
379 /* some kind of deserialization problem ... */
380 if ((u_int32_t) msg.rm_xid == (u_int32_t) xid)
381 fprintf (stderr, "Broadcast deserialization problem");
382 /* otherwise, just random garbage */
383 #endif
384 }
385 xdrs->x_op = XDR_FREE;
386 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
387 (void) xdr_replymsg (xdrs, &msg);
388 (void) (*xresults) (xdrs, resultsp);
389 xdr_destroy (xdrs);
390 if (done)
391 {
392 stat = RPC_SUCCESS;
393 goto done_broad;
394 }
395 else
396 {
397 goto recv_again;
398 }
399 }
400 done_broad:
401 (void) close (sock);
402 AUTH_DESTROY (unix_auth);
403 return stat;
404 }
405