tport_type_udp.c 11.2 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/*
 * This file is part of the Sofia-SIP package
 *
 * Copyright (C) 2006 Nokia Corporation.
 *
 * Contact: Pekka Pessi <pekka.pessi@nokia.com>
 *
 * This 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.
 *
 * This 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

25
/**@CFILE tport_type_udp.c UDP Transport
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
 *
 * See tport.docs for more detailed description of tport interface.
 *
 * @author Pekka Pessi <Pekka.Pessi@nokia.com>
 * @author Martti Mela <Martti.Mela@nokia.com>
 *
 * @date Created: Fri Mar 24 08:45:49 EET 2006 ppessi
 */

#include "config.h"

#include "tport_internal.h"

#if HAVE_IP_RECVERR || HAVE_IPV6_RECVERR
#include <linux/types.h>
#include <linux/errqueue.h>
#include <sys/uio.h>
#endif

#include <stdlib.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>

/* ---------------------------------------------------------------------- */
/* UDP */

54 55 56 57 58 59 60
static
int tport_udp_init_client(tport_primary_t *pri,
			  tp_name_t tpn[1],
			  su_addrinfo_t *ai,
			  tagi_t const *tags,
			  char const **return_culprit);

Kai Vehmanen's avatar
Kai Vehmanen committed
61 62 63 64 65 66 67
#if HAVE_FUNC
#elif HAVE_FUNCTION
#define __func__ __FUNCTION__
#else
static char const __func__[] = "tport_type_udp";
#endif

68
tport_vtable_t const tport_udp_client_vtable =
69 70 71
{
  "udp", tport_type_client,
  sizeof (tport_primary_t),
72
  tport_udp_init_client,
73 74 75 76 77 78 79 80 81 82 83 84 85
  NULL,
  NULL,
  NULL,
  sizeof (tport_t),
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  tport_recv_dgram,
  tport_send_dgram,
};

86
tport_vtable_t const tport_udp_vtable =
87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
{
  "udp", tport_type_local,
  sizeof (tport_primary_t),
  tport_udp_init_primary,
  NULL,
  NULL,
  NULL,
  sizeof (tport_t),
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  tport_recv_dgram,
  tport_send_dgram,
};

104 105
static void tport_check_trunc(tport_t *tp, su_addrinfo_t *ai);

106
int tport_udp_init_primary(tport_primary_t *pri,
107
			   tp_name_t tpn[1],
108 109 110 111 112 113 114 115 116
			   su_addrinfo_t *ai,
			   tagi_t const *tags,
			   char const **return_culprit)
{
  unsigned rmem = 0, wmem = 0;
  int events = SU_WAIT_IN;
  int s;

  s = su_socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
117
  if (s == INVALID_SOCKET)
118 119 120 121 122 123 124
    return *return_culprit = "socket", -1;

  pri->pri_primary->tp_socket = s;

  if (tport_bind_socket(s, ai, return_culprit) < 0)
    return -1;

125 126
  tport_set_tos(s, ai, pri->pri_params->tpp_tos);

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
#if HAVE_IP_RECVERR
  if (ai->ai_family == AF_INET || ai->ai_family == AF_INET6) {
    int const one = 1;
    if (setsockopt(s, SOL_IP, IP_RECVERR, &one, sizeof(one)) < 0) {
      if (ai->ai_family == AF_INET)
	SU_DEBUG_3(("setsockopt(IPVRECVERR): %s\n", su_strerror(su_errno())));
    }
    events |= SU_WAIT_ERR;
  }
#endif
#if HAVE_IPV6_RECVERR
  if (ai->ai_family == AF_INET6) {
    int const one = 1;
    if (setsockopt(s, SOL_IPV6, IPV6_RECVERR, &one, sizeof(one)) < 0)
      SU_DEBUG_3(("setsockopt(IPV6_RECVERR): %s\n", su_strerror(su_errno())));
    events |= SU_WAIT_ERR;
  }
#endif

  tl_gets(tags, 
	  TPTAG_UDP_RMEM_REF(rmem),
	  TPTAG_UDP_WMEM_REF(wmem),
	  TAG_END());

  if (rmem != 0 && 
      setsockopt(s, SOL_SOCKET, SO_RCVBUF, (void *)&rmem, sizeof rmem) < 0) {
    SU_DEBUG_3(("setsockopt(SO_RCVBUF): %s\n", 
		su_strerror(su_errno())));
  }

  if (wmem != 0 && 
      setsockopt(s, SOL_SOCKET, SO_SNDBUF, (void *)&wmem, sizeof wmem) < 0) {
    SU_DEBUG_3(("setsockopt(SO_SNDBUF): %s\n", 
		su_strerror(su_errno())));
  }

  pri->pri_primary->tp_events = events;

165 166
  tport_init_compressor(pri->pri_primary, tpn->tpn_comp, tags);

167 168
  tport_check_trunc(pri->pri_primary, ai);

169
#if HAVE_SOFIA_STUN
170
  tport_stun_server_add_socket(pri->pri_primary);
171
#endif
172

173 174 175
  return 0;
}

176 177 178 179 180 181 182 183 184 185 186
static
int tport_udp_init_client(tport_primary_t *pri,
			  tp_name_t tpn[1],
			  su_addrinfo_t *ai,
			  tagi_t const *tags,
			  char const **return_culprit)
{
  pri->pri_primary->tp_conn_orient = 1;
  return 0;
}

187 188 189 190
/** Runtime test making sure MSG_TRUNC work as expected */
static void tport_check_trunc(tport_t *tp, su_addrinfo_t *ai)
{
#if HAVE_MSG_TRUNC
191
  ssize_t n;
192 193 194 195
  char buffer[2];
  su_sockaddr_t su[1];
  socklen_t sulen = sizeof su;

196 197 198
  n = su_sendto(tp->tp_socket,
		"TEST", 4, 0,
		(void *)ai->ai_addr, ai->ai_addrlen);
199 200

  for (;;) {
201 202
    n = su_recvfrom(tp->tp_socket, buffer, sizeof buffer, MSG_TRUNC, 
		    (void *)&su, &sulen);
203

204
    if (n > (ssize_t)sizeof buffer) {
205 206 207 208 209 210 211 212 213 214 215
      tp->tp_trunc = 1;
      return;
    }

    /* XXX - check that su and tp->tp_addrinfo->ai_addr match */

    return;
  }
#endif
}

216 217 218 219
/** Receive datagram.
 *
 * @retval -1 error
 * @retval 0  end-of-stream  
220 221 222
 * @retval 1  normal receive (should never happen)
 * @retval 2  incomplete recv, call me again (should never happen)
 * @retval 3  STUN keepalive, ignore
223 224 225
 */
int tport_recv_dgram(tport_t *self)
{
226
  msg_t *msg;
227
  ssize_t n, veclen, N;
Pekka Pessi's avatar
Pekka Pessi committed
228
  su_addrinfo_t *ai;
229
  su_sockaddr_t *from;
Pekka Pessi's avatar
Pekka Pessi committed
230
  socklen_t fromlen;
231 232
  msg_iovec_t iovec[msg_n_fragments] = {{ 0 }};
  uint8_t sample[1];
233 234 235

  /* Simulate packet loss */
  if (self->tp_params->tpp_drop && 
236
      (unsigned)su_randint(0, 1000) < self->tp_params->tpp_drop) {
237
    su_recv(self->tp_socket, sample, 1, 0);
238
    SU_DEBUG_3(("tport(%p): simulated packet loss!\n", (void *)self));
239 240 241
    return 0;
  }

242
  assert(self->tp_msg == NULL);
243

244 245 246 247 248 249 250
#if nomore
  /* We used to resize the buffer, but it fragments the memory */
  N = 65535;
#else
  N = (ssize_t)su_getmsgsize(self->tp_socket);
  if (N == -1) {
    int err = su_errno();
251
    SU_DEBUG_1(("%s(%p): su_getmsgsize(): %s (%d)\n", __func__, (void *)self,
252 253 254
		su_strerror(err), err));
    return -1;
  }
255 256 257 258 259
  if (N == 0) {
    su_recv(self->tp_socket, sample, 1, 0);
    SU_DEBUG_3(("tport(%p): zero length packet", (void *)self));
    return 0;
  }
260 261 262 263
#endif

  veclen = tport_recv_iovec(self, &self->tp_msg, iovec, N, 1);
  if (veclen == -1)
264 265
    return -1;

266
  msg = self->tp_msg;
267

Pekka Pessi's avatar
Pekka Pessi committed
268
  ai = msg_addrinfo(msg);
269
  from = (su_sockaddr_t *)ai->ai_addr, fromlen = (socklen_t)(ai->ai_addrlen);
270

Pekka Pessi's avatar
Pekka Pessi committed
271 272 273 274
  n = su_vrecv(self->tp_socket, iovec, veclen, 0, from, &fromlen);
  
  ai->ai_addrlen = fromlen;
  
275 276
  if (n == SOCKET_ERROR) {
    int error = su_errno();
277
    msg_destroy(msg); self->tp_msg = NULL;
278
    su_seterrno(error);
279

280
    if (su_is_blocking(error))
281 282 283 284 285
      return 0;
    else
      return -1;
  }
  else if (n <= 1) {
286 287
    SU_DEBUG_1(("%s(%p): runt of "MOD_ZD" bytes\n",
		"tport_recv_dgram", (void *)self, n));
288 289
    msg_destroy(msg), self->tp_msg = NULL;
    return 0;
290 291 292 293
  }

  SU_CANONIZE_SOCKADDR(from);

294
  if (self->tp_master->mr_dump_file)
295 296
    tport_dump_iovec(self, msg, n, iovec, veclen, "recv", "from");

297
  *sample = *((uint8_t *)iovec[0].mv_base);
298

299 300 301 302 303
  /* Commit received data into buffer. This may relocate iovec contents */
  msg_recv_commit(msg, n, 1);

  if ((sample[0] & 0xf8) == 0xf8)
    /* SigComp */
304 305
    return tport_recv_comp_dgram(self, self->tp_comp, &self->tp_msg, 
				 from, fromlen);
306
#if HAVE_SOFIA_STUN
307 308
  else if (sample[0] == 0 || sample[0] == 1)
    /* STUN request or response */
309
    return tport_recv_stun_dgram(self, &self->tp_msg, from, fromlen);
310
#endif
311 312
  else
    return 0;
313 314 315
}

/** Send using su_vsend(). Map IPv4 addresses as IPv6 addresses, if needed. */
316 317 318
ssize_t tport_send_dgram(tport_t const *self, msg_t *msg, 
			 msg_iovec_t iov[], 
			 size_t iovused)
319
{
320 321
  su_sockaddr_t su[1];
  socklen_t sulen = sizeof su;
322 323 324 325

  if (tport_is_connection_oriented(self))
    return su_vsend(self->tp_socket, iov, iovused, MSG_NOSIGNAL, NULL, 0);

326
  msg_get_address(msg, su, &sulen);
327 328 329

#if SU_HAVE_IN6 && defined(IN6_INADDR_TO_V4MAPPED)
  if (su->su_family == AF_INET && self->tp_addrinfo->ai_family == AF_INET6) {
330 331
    su_sockaddr_t su0[1];

332 333 334 335 336 337 338
    memset(su0, 0, sizeof su0);

    su0->su_family = self->tp_addrinfo->ai_family;
    su0->su_port = su->su_port;

    IN6_INADDR_TO_V4MAPPED(&su->su_sin.sin_addr, &su0->su_sin6.sin6_addr);

339
    memcpy(su, su0, sulen = sizeof(su0->su_sin6));
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
  }
#endif

  su_soerror(self->tp_socket); /* XXX - we *still* have a race condition */

  return su_vsend(self->tp_socket, iov, iovused, MSG_NOSIGNAL, su, sulen);
}


#if !HAVE_IP_RECVERR && !HAVE_IPV6_RECVERR

/** Process UDP error event. */
int tport_udp_error(tport_t const *self, su_sockaddr_t name[1])
{
  if (tport_is_connection_oriented(self))
    name[0] = self->tp_addr[0];
  return su_soerror(self->tp_socket);
}

#else

/** Process UDP error event. */
int tport_udp_error(tport_t const *self, su_sockaddr_t name[1])
{
  struct cmsghdr *c;
  struct sock_extended_err *ee;
  su_sockaddr_t *from;
  char control[512];
  char errmsg[64 + 768];
  struct iovec iov[1];
  struct msghdr msg[1] = {{ 0 }};
  int n;

  msg->msg_name = name, msg->msg_namelen = sizeof(*name);
  msg->msg_iov = iov, msg->msg_iovlen = 1;
  iov->iov_base = errmsg, iov->iov_len = sizeof(errmsg);
  msg->msg_control = control, msg->msg_controllen = sizeof(control);

  n = recvmsg(self->tp_socket, msg, MSG_ERRQUEUE);

  if (n < 0) {
    int err = su_errno();
382
    if (!su_is_blocking(err))
383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
      SU_DEBUG_1(("%s: recvmsg: %s\n", __func__, su_strerror(err)));
    return 0;
  }

  if ((msg->msg_flags & MSG_ERRQUEUE) != MSG_ERRQUEUE) {
    SU_DEBUG_1(("%s: recvmsg: no errqueue\n", __func__));
    return 0;
  }

  if (msg->msg_flags & MSG_CTRUNC) {
    SU_DEBUG_1(("%s: extended error was truncated\n", __func__));
    return 0;
  }

  if (msg->msg_flags & MSG_TRUNC) {
    /* ICMP message may contain original message... */
    SU_DEBUG_3(("%s: icmp(6) message was truncated (at %d)\n", __func__, n));
  }

  /* Go through the ancillary data */
  for (c = CMSG_FIRSTHDR(msg); c; c = CMSG_NXTHDR(msg, c)) {
    if (0
#if HAVE_IP_RECVERR
	|| (c->cmsg_level == SOL_IP && c->cmsg_type == IP_RECVERR)
#endif
#if HAVE_IPV6_RECVERR
	|| (c->cmsg_level == SOL_IPV6 && c->cmsg_type == IPV6_RECVERR)
#endif
	) {
      char info[128];
      char const *origin;

      ee = (struct sock_extended_err *)CMSG_DATA(c);
      from = (su_sockaddr_t *)SO_EE_OFFENDER(ee);
      info[0] = '\0';

      switch (ee->ee_origin) {
      case SO_EE_ORIGIN_LOCAL:
	origin = "local";
	break;
      case SO_EE_ORIGIN_ICMP:
	origin = "icmp";
	snprintf(info, sizeof(info), " type=%u code=%u", 
		 ee->ee_type, ee->ee_code);
	break;
      case SO_EE_ORIGIN_ICMP6:
	origin = "icmp6";
	snprintf(info, sizeof(info), " type=%u code=%u", 
		ee->ee_type, ee->ee_code);
	break;
      case SO_EE_ORIGIN_NONE:
	origin = "none";
	break;
      default:
	origin = "unknown";
	break;
      }

      if (ee->ee_info)
	snprintf(info + strlen(info), sizeof(info) - strlen(info), 
		 " info=%08x", ee->ee_info);

      SU_DEBUG_3(("%s: %s (%d) [%s%s]\n",
		  __func__, su_strerror(ee->ee_errno), ee->ee_errno, 
		  origin, info));
      if (from->su_family != AF_UNSPEC)
	SU_DEBUG_3(("\treported by [%s]:%u\n",
		    inet_ntop(from->su_family, SU_ADDR(from), 
			      info, sizeof(info)),
		    ntohs(from->su_port)));

      if (msg->msg_namelen == 0)
	name->su_family = AF_UNSPEC;

      SU_CANONIZE_SOCKADDR(name);

      return ee->ee_errno;
    }
  }

  return 0;
}
#endif