about summary refs log tree commit diff
path: root/sunrpc/pmap_rmt.c
blob: c036d889efe1a527f78c91876dfcf63238ec1a3a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
/*
 * pmap_rmt.c
 * Client interface to pmap rpc service.
 * remote call and broadcast service
 *
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the "Oracle America, Inc." nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <unistd.h>
#include <string.h>
#include <libintl.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_rmt.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <stdio.h>
#include <errno.h>
#include <sys/param.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <shlib-compat.h>

#define MAX_BROADCAST_SIZE 1400

extern u_long _create_xid (void);

static const struct timeval timeout = {3, 0};

/*
 * pmapper remote-call-service interface.
 * This routine is used to call the pmapper remote call service
 * which will look up a service program in the port maps, and then
 * remotely call that routine with the given parameters.  This allows
 * programs to do a lookup and call in one step.
 */
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)
{
  int socket = -1;
  CLIENT *client;
  struct rmtcallargs a;
  struct rmtcallres r;
  enum clnt_stat stat;

  addr->sin_port = htons (PMAPPORT);
  client = clntudp_create (addr, PMAPPROG, PMAPVERS, timeout, &socket);
  if (client != (CLIENT *) NULL)
    {
      a.prog = prog;
      a.vers = vers;
      a.proc = proc;
      a.args_ptr = argsp;
      a.xdr_args = xdrargs;
      r.port_ptr = port_ptr;
      r.results_ptr = resp;
      r.xdr_results = xdrres;
      stat = CLNT_CALL (client, PMAPPROC_CALLIT,
			(xdrproc_t)xdr_rmtcall_args,
			(caddr_t)&a, (xdrproc_t)xdr_rmtcallres,
			(caddr_t)&r, tout);
      CLNT_DESTROY (client);
    }
  else
    {
      stat = RPC_FAILED;
    }
  /* (void)__close(socket); CLNT_DESTROY already closed it */
  addr->sin_port = 0;
  return stat;
}
libc_hidden_nolink_sunrpc (pmap_rmtcall, GLIBC_2_0)


/*
 * XDR remote call arguments
 * written for XDR_ENCODE direction only
 */
bool_t
xdr_rmtcall_args (XDR *xdrs, struct rmtcallargs *cap)
{
  u_int lenposition, argposition, position;

  if (xdr_u_long (xdrs, &(cap->prog)) &&
      xdr_u_long (xdrs, &(cap->vers)) &&
      xdr_u_long (xdrs, &(cap->proc)))
    {
      u_long dummy_arglen = 0;
      lenposition = XDR_GETPOS (xdrs);
      if (!xdr_u_long (xdrs, &dummy_arglen))
	return FALSE;
      argposition = XDR_GETPOS (xdrs);
      if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
	return FALSE;
      position = XDR_GETPOS (xdrs);
      cap->arglen = (u_long) position - (u_long) argposition;
      XDR_SETPOS (xdrs, lenposition);
      if (!xdr_u_long (xdrs, &(cap->arglen)))
	return FALSE;
      XDR_SETPOS (xdrs, position);
      return TRUE;
    }
  return FALSE;
}
libc_hidden_nolink_sunrpc (xdr_rmtcall_args, GLIBC_2_0)

/*
 * XDR remote call results
 * written for XDR_DECODE direction only
 */
bool_t
xdr_rmtcallres (XDR *xdrs, struct rmtcallres *crp)
{
  caddr_t port_ptr;

  port_ptr = (caddr_t) crp->port_ptr;
  if (xdr_reference (xdrs, &port_ptr, sizeof (u_long),
		     (xdrproc_t) xdr_u_long)
      && xdr_u_long (xdrs, &crp->resultslen))
    {
      crp->port_ptr = (u_long *) port_ptr;
      return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
    }
  return FALSE;
}
libc_hidden_nolink_sunrpc (xdr_rmtcallres, GLIBC_2_0)


/*
 * The following is kludged-up support for simple rpc broadcasts.
 * Someday a large, complicated system will replace these trivial
 * routines which only support udp/ip .
 */

static int
internal_function
getbroadcastnets (struct in_addr *addrs, int naddrs)
{
  struct ifaddrs *ifa;

  if (getifaddrs (&ifa) != 0)
    {
      perror ("broadcast: getifaddrs");
      return 0;
    }

  int i = 0;
  struct ifaddrs *run = ifa;
  while (run != NULL && i < naddrs)
    {
      if ((run->ifa_flags & IFF_BROADCAST) != 0
	  && (run->ifa_flags & IFF_UP) != 0
	  && run->ifa_addr != NULL
	  && run->ifa_addr->sa_family == AF_INET)
	/* Copy the broadcast address.  */
	addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr;

      run = run->ifa_next;
    }

  freeifaddrs (ifa);

  return i;
}


enum clnt_stat
clnt_broadcast (/* program number */
		u_long prog,
		/* version number */
		u_long vers,
		/* procedure number */
		u_long proc,
		/* xdr routine for args */
		xdrproc_t xargs,
		/* pointer to args */
		caddr_t argsp,
		/* xdr routine for results */
		xdrproc_t xresults,
		/* pointer to results */
		caddr_t resultsp,
		/* call with each result obtained */
		resultproc_t eachresult)
{
  enum clnt_stat stat = RPC_FAILED;
  AUTH *unix_auth = authunix_create_default ();
  XDR xdr_stream;
  XDR *xdrs = &xdr_stream;
  struct timeval t;
  int outlen, inlen, nets;
  socklen_t fromlen;
  int sock;
  int on = 1;
  struct pollfd fd;
  int milliseconds;
  int i;
  bool_t done = FALSE;
  u_long xid;
  u_long port;
  struct in_addr addrs[20];
  struct sockaddr_in baddr, raddr;	/* broadcast and response addresses */
  struct rmtcallargs a;
  struct rmtcallres r;
  struct rpc_msg msg;
  char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];

  /*
   * initialization: create a socket, a broadcast address, and
   * preserialize the arguments into a send buffer.
   */
  if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
    {
      perror (_("Cannot create socket for broadcast rpc"));
      stat = RPC_CANTSEND;
      goto done_broad;
    }
#ifdef SO_BROADCAST
  if (__setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
    {
      perror (_("Cannot set socket option SO_BROADCAST"));
      stat = RPC_CANTSEND;
      goto done_broad;
    }
#endif /* def SO_BROADCAST */
  fd.fd = sock;
  fd.events = POLLIN;
  nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0]));
  __bzero ((char *) &baddr, sizeof (baddr));
  baddr.sin_family = AF_INET;
  baddr.sin_port = htons (PMAPPORT);
  baddr.sin_addr.s_addr = htonl (INADDR_ANY);
/*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
  msg.rm_xid = xid = _create_xid ();
  t.tv_usec = 0;
  msg.rm_direction = CALL;
  msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
  msg.rm_call.cb_prog = PMAPPROG;
  msg.rm_call.cb_vers = PMAPVERS;
  msg.rm_call.cb_proc = PMAPPROC_CALLIT;
  msg.rm_call.cb_cred = unix_auth->ah_cred;
  msg.rm_call.cb_verf = unix_auth->ah_verf;
  a.prog = prog;
  a.vers = vers;
  a.proc = proc;
  a.xdr_args = xargs;
  a.args_ptr = argsp;
  r.port_ptr = &port;
  r.xdr_results = xresults;
  r.results_ptr = resultsp;
  xdrmem_create (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
  if ((!xdr_callmsg (xdrs, &msg))
      || (!xdr_rmtcall_args (xdrs, &a)))
    {
      stat = RPC_CANTENCODEARGS;
      goto done_broad;
    }
  outlen = (int) xdr_getpos (xdrs);
  xdr_destroy (xdrs);
  /*
   * Basic loop: broadcast a packet and wait a while for response(s).
   * The response timeout grows larger per iteration.
   */
  for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
    {
      for (i = 0; i < nets; i++)
	{
	  baddr.sin_addr = addrs[i];
	  if (__sendto (sock, outbuf, outlen, 0,
			(struct sockaddr *) &baddr,
			sizeof (struct sockaddr)) != outlen)
	    {
	      perror (_("Cannot send broadcast packet"));
	      stat = RPC_CANTSEND;
	      goto done_broad;
	    }
	}
      if (eachresult == NULL)
	{
	  stat = RPC_SUCCESS;
	  goto done_broad;
	}
    recv_again:
      msg.acpted_rply.ar_verf = _null_auth;
      msg.acpted_rply.ar_results.where = (caddr_t) & r;
      msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_rmtcallres;
      milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
      switch (__poll(&fd, 1, milliseconds))
	{

	case 0:		/* timed out */
	  stat = RPC_TIMEDOUT;
	  continue;

	case -1:		/* some kind of error */
	  if (errno == EINTR)
	    goto recv_again;
	  perror (_("Broadcast poll problem"));
	  stat = RPC_CANTRECV;
	  goto done_broad;

	}			/* end of poll results switch */
    try_again:
      fromlen = sizeof (struct sockaddr);
      inlen = __recvfrom (sock, inbuf, UDPMSGSIZE, 0,
			  (struct sockaddr *) &raddr, &fromlen);
      if (inlen < 0)
	{
	  if (errno == EINTR)
	    goto try_again;
	  perror (_("Cannot receive reply to broadcast"));
	  stat = RPC_CANTRECV;
	  goto done_broad;
	}
      if ((size_t) inlen < sizeof (u_long))
	goto recv_again;
      /*
       * see if reply transaction id matches sent id.
       * If so, decode the results.
       */
      xdrmem_create (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
      if (xdr_replymsg (xdrs, &msg))
	{
	  if (((u_int32_t) msg.rm_xid == (u_int32_t) xid) &&
	      (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
	      (msg.acpted_rply.ar_stat == SUCCESS))
	    {
	      raddr.sin_port = htons ((u_short) port);
	      done = (*eachresult) (resultsp, &raddr);
	    }
	  /* otherwise, we just ignore the errors ... */
	}
      else
	{
#ifdef notdef
	  /* some kind of deserialization problem ... */
	  if ((u_int32_t) msg.rm_xid == (u_int32_t) xid)
	    fprintf (stderr, "Broadcast deserialization problem");
	  /* otherwise, just random garbage */
#endif
	}
      xdrs->x_op = XDR_FREE;
      msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
      (void) xdr_replymsg (xdrs, &msg);
      (void) (*xresults) (xdrs, resultsp);
      xdr_destroy (xdrs);
      if (done)
	{
	  stat = RPC_SUCCESS;
	  goto done_broad;
	}
      else
	{
	  goto recv_again;
	}
    }
done_broad:
  (void) __close (sock);
  AUTH_DESTROY (unix_auth);
  return stat;
}
libc_hidden_nolink_sunrpc (clnt_broadcast, GLIBC_2_0)