aboutsummaryrefslogtreecommitdiff
path: root/sunrpc/svc_tcp.c
blob: 0c1ecc3e7328acb3cd247af848988ed5bb5a0969 (plain)
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
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
/*
 * svc_tcp.c, Server side for TCP/IP based RPC.
 *
 * Copyright (C) 2012-2017 Free Software Foundation, Inc.
 * This file is part of the GNU C Library.
 *
 * The GNU C Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * The GNU C Library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the GNU C Library; if not, see
 * <http://www.gnu.org/licenses/>.
 *
 * 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.
 *
 * Actually implements two flavors of transporter -
 * a tcp rendezvouser (a listener and connection establisher)
 * and a record/tcp stream.
 */

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <libintl.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <errno.h>
#include <stdlib.h>

#include <wchar.h>
#include <libio/iolibio.h>
#include <shlib-compat.h>

/*
 * Ops vector for TCP/IP based rpc service handle
 */
static bool_t svctcp_recv (SVCXPRT *, struct rpc_msg *);
static enum xprt_stat svctcp_stat (SVCXPRT *);
static bool_t svctcp_getargs (SVCXPRT *, xdrproc_t, caddr_t);
static bool_t svctcp_reply (SVCXPRT *, struct rpc_msg *);
static bool_t svctcp_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
static void svctcp_destroy (SVCXPRT *);

static const struct xp_ops svctcp_op =
{
  svctcp_recv,
  svctcp_stat,
  svctcp_getargs,
  svctcp_reply,
  svctcp_freeargs,
  svctcp_destroy
};

/*
 * Ops vector for TCP/IP rendezvous handler
 */
static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *);
static enum xprt_stat rendezvous_stat (SVCXPRT *);
static void svctcp_rendezvous_abort (void) __attribute__ ((__noreturn__));

/* This function makes sure abort() relocation goes through PLT
   and thus can be lazy bound.  */
static void
svctcp_rendezvous_abort (void)
{
  abort ();
};

static const struct xp_ops svctcp_rendezvous_op =
{
  rendezvous_request,
  rendezvous_stat,
  (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort,
  (bool_t (*) (SVCXPRT *, struct rpc_msg *)) svctcp_rendezvous_abort,
  (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort,
  svctcp_destroy
};

static int readtcp (char*, char *, int);
static int writetcp (char *, char *, int);
static SVCXPRT *makefd_xprt (int, u_int, u_int);

struct tcp_rendezvous
  {				/* kept in xprt->xp_p1 */
    u_int sendsize;
    u_int recvsize;
  };

struct tcp_conn
  {				/* kept in xprt->xp_p1 */
    enum xprt_stat strm_stat;
    u_long x_id;
    XDR xdrs;
    char verf_body[MAX_AUTH_BYTES];
  };

/*
 * Usage:
 *      xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
 *
 * Creates, registers, and returns a (rpc) tcp based transporter.
 * Once *xprt is initialized, it is registered as a transporter
 * see (svc.h, xprt_register).  This routine returns
 * a NULL if a problem occurred.
 *
 * If sock<0 then a socket is created, else sock is used.
 * If the socket, sock is not bound to a port then svctcp_create
 * binds it to an arbitrary port.  The routine then starts a tcp
 * listener on the socket's associated port.  In any (successful) case,
 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
 * associated port number.
 *
 * Since tcp streams do buffered io similar to stdio, the caller can specify
 * how big the send and receive buffers are via the second and third parms;
 * 0 => use the system default.
 */
SVCXPRT *
svctcp_create (int sock, u_int sendsize, u_int recvsize)
{
  bool_t madesock = FALSE;
  SVCXPRT *xprt;
  struct tcp_rendezvous *r;
  struct sockaddr_in addr;
  socklen_t len = sizeof (struct sockaddr_in);

  if (sock == RPC_ANYSOCK)
    {
      if ((sock = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
	{
	  perror (_("svc_tcp.c - tcp socket creation problem"));
	  return (SVCXPRT *) NULL;
	}
      madesock = TRUE;
    }
  memset ((char *) &addr, 0, sizeof (addr));
  addr.sin_family = AF_INET;
  if (bindresvport (sock, &addr))
    {
      addr.sin_port = 0;
      (void) __bind (sock, (struct sockaddr *) &addr, len);
    }
  if ((__getsockname (sock, (struct sockaddr *) &addr, &len) != 0) ||
      (__listen (sock, SOMAXCONN) != 0))
    {
      perror (_("svc_tcp.c - cannot getsockname or listen"));
      if (madesock)
	(void) __close (sock);
      return (SVCXPRT *) NULL;
    }
  r = (struct tcp_rendezvous *) mem_alloc (sizeof (*r));
  xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
  if (r == NULL || xprt == NULL)
    {
      (void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
      mem_free (r, sizeof (*r));
      mem_free (xprt, sizeof (SVCXPRT));
      return NULL;
    }
  r->sendsize = sendsize;
  r->recvsize = recvsize;
  xprt->xp_p2 = NULL;
  xprt->xp_p1 = (caddr_t) r;
  xprt->xp_verf = _null_auth;
  xprt->xp_ops = &svctcp_rendezvous_op;
  xprt->xp_port = ntohs (addr.sin_port);
  xprt->xp_sock = sock;
  xprt_register (xprt);
  return xprt;
}
#ifdef EXPORT_RPC_SYMBOLS
libc_hidden_def (svctcp_create)
#else
libc_hidden_nolink_sunrpc (svctcp_create, GLIBC_2_0)
#endif

/*
 * Like svtcp_create(), except the routine takes any *open* UNIX file
 * descriptor as its first input.
 */
SVCXPRT *
svcfd_create (int fd, u_int sendsize, u_int recvsize)
{
  return makefd_xprt (fd, sendsize, recvsize);
}
libc_hidden_nolink_sunrpc (svcfd_create, GLIBC_2_0)

static SVCXPRT *
makefd_xprt (int fd, u_int sendsize, u_int recvsize)
{
  SVCXPRT *xprt;
  struct tcp_conn *cd;

  xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
  cd = (struct tcp_conn *) mem_alloc (sizeof (struct tcp_conn));
  if (xprt == (SVCXPRT *) NULL || cd == NULL)
    {
      (void) __fxprintf (NULL, "%s: %s", "svc_tcp: makefd_xprt",
			 _("out of memory\n"));
      mem_free (xprt, sizeof (SVCXPRT));
      mem_free (cd, sizeof (struct tcp_conn));
      return NULL;
    }
  cd->strm_stat = XPRT_IDLE;
  xdrrec_create (&(cd->xdrs), sendsize, recvsize,
		 (caddr_t) xprt, readtcp, writetcp);
  xprt->xp_p2 = NULL;
  xprt->xp_p1 = (caddr_t) cd;
  xprt->xp_verf.oa_base = cd->verf_body;
  xprt->xp_addrlen = 0;
  xprt->xp_ops = &svctcp_op;	/* truly deals with calls */
  xprt->xp_port = 0;		/* this is a connection, not a rendezvouser */
  xprt->xp_sock = fd;
  xprt_register (xprt);
  return xprt;
}

static bool_t
rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg)
{
  int sock;
  struct tcp_rendezvous *r;
  struct sockaddr_in addr;
  socklen_t len;

  r = (struct tcp_rendezvous *) xprt->xp_p1;
again:
  len = sizeof (struct sockaddr_in);
  if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr, &len)) < 0)
    {
      if (errno == EINTR)
	goto again;
      __svc_accept_failed ();
      return FALSE;
    }
  /*
   * make a new transporter (re-uses xprt)
   */
  xprt = makefd_xprt (sock, r->sendsize, r->recvsize);
  memcpy (&xprt->xp_raddr, &addr, sizeof (addr));
  xprt->xp_addrlen = len;
  return FALSE;		/* there is never an rpc msg to be processed */
}

static enum xprt_stat
rendezvous_stat (SVCXPRT *xprt)
{
  return XPRT_IDLE;
}

static void
svctcp_destroy (SVCXPRT *xprt)
{
  struct tcp_conn *cd = (struct tcp_conn *) xprt->xp_p1;

  xprt_unregister (xprt);
  (void) __close (xprt->xp_sock);
  if (xprt->xp_port != 0)
    {
      /* a rendezvouser socket */
      xprt->xp_port = 0;
    }
  else
    {
      /* an actual connection socket */
      XDR_DESTROY (&(cd->xdrs));
    }
  mem_free ((caddr_t) cd, sizeof (struct tcp_conn));
  mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
}


/*
 * reads data from the tcp connection.
 * any error is fatal and the connection is closed.
 * (And a read of zero bytes is a half closed stream => error.)
 */
static int
readtcp (char *xprtptr, char *buf, int len)
{
  SVCXPRT *xprt = (SVCXPRT *)xprtptr;
  int sock = xprt->xp_sock;
  int milliseconds = 35 * 1000;
  struct pollfd pollfd;

  do
    {
      pollfd.fd = sock;
      pollfd.events = POLLIN;
      switch (__poll (&pollfd, 1, milliseconds))
	{
	case -1:
	  if (errno == EINTR)
	    continue;
	  /*FALLTHROUGH*/
	case 0:
	  goto fatal_err;
	default:
	  if ((pollfd.revents & POLLERR) || (pollfd.revents & POLLHUP)
	      || (pollfd.revents & POLLNVAL))
	    goto fatal_err;
	  break;
	}
    }
  while ((pollfd.revents & POLLIN) == 0);

  if ((len = __read (sock, buf, len)) > 0)
    return len;

 fatal_err:
  ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
  return -1;
}

/*
 * writes data to the tcp connection.
 * Any error is fatal and the connection is closed.
 */
static int
writetcp (char *xprtptr, char * buf, int len)
{
  SVCXPRT *xprt = (SVCXPRT *)xprtptr;
  int i, cnt;

  for (cnt = len; cnt > 0; cnt -= i, buf += i)
    {
      if ((i = __write (xprt->xp_sock, buf, cnt)) < 0)
	{
	  ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
	  return -1;
	}
    }
  return len;
}

static enum xprt_stat
svctcp_stat (SVCXPRT *xprt)
{
  struct tcp_conn *cd =
  (struct tcp_conn *) (xprt->xp_p1);

  if (cd->strm_stat == XPRT_DIED)
    return XPRT_DIED;
  if (!xdrrec_eof (&(cd->xdrs)))
    return XPRT_MOREREQS;
  return XPRT_IDLE;
}

static bool_t
svctcp_recv (SVCXPRT *xprt, struct rpc_msg *msg)
{
  struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1);
  XDR *xdrs = &(cd->xdrs);

  xdrs->x_op = XDR_DECODE;
  (void) xdrrec_skiprecord (xdrs);
  if (xdr_callmsg (xdrs, msg))
    {
      cd->x_id = msg->rm_xid;
      return TRUE;
    }
  cd->strm_stat = XPRT_DIED;	/* XXXX */
  return FALSE;
}

static bool_t
svctcp_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
{
  return ((*xdr_args) (&(((struct tcp_conn *)
			  (xprt->xp_p1))->xdrs), args_ptr));
}

static bool_t
svctcp_freeargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
{
  XDR *xdrs = &(((struct tcp_conn *) (xprt->xp_p1))->xdrs);

  xdrs->x_op = XDR_FREE;
  return ((*xdr_args) (xdrs, args_ptr));
}

static bool_t
svctcp_reply (SVCXPRT *xprt, struct rpc_msg *msg)
{
  struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1);
  XDR *xdrs = &(cd->xdrs);
  bool_t stat;

  xdrs->x_op = XDR_ENCODE;
  msg->rm_xid = cd->x_id;
  stat = xdr_replymsg (xdrs, msg);
  (void) xdrrec_endofrecord (xdrs, TRUE);
  return stat;
}