tport_type_udp.c 11 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);

169 170
  tport_stun_server_add_socket(pri->pri_primary);

171 172 173
  return 0;
}

174 175 176 177 178 179 180 181 182 183 184
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;
}

185 186 187 188
/** 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
189
  ssize_t n;
190 191 192 193
  char buffer[2];
  su_sockaddr_t su[1];
  socklen_t sulen = sizeof su;

194 195 196
  n = su_sendto(tp->tp_socket,
		"TEST", 4, 0,
		(void *)ai->ai_addr, ai->ai_addrlen);
197 198

  for (;;) {
199 200
    n = su_recvfrom(tp->tp_socket, buffer, sizeof buffer, MSG_TRUNC, 
		    (void *)&su, &sulen);
201

202
    if (n > (ssize_t)sizeof buffer) {
203 204 205 206 207 208 209 210 211 212 213
      tp->tp_trunc = 1;
      return;
    }

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

    return;
  }
#endif
}

214 215 216 217
/** Receive datagram.
 *
 * @retval -1 error
 * @retval 0  end-of-stream  
218 219 220
 * @retval 1  normal receive (should never happen)
 * @retval 2  incomplete recv, call me again (should never happen)
 * @retval 3  STUN keepalive, ignore
221 222 223
 */
int tport_recv_dgram(tport_t *self)
{
224
  msg_t *msg;
225
  ssize_t n, veclen, N;
Pekka Pessi's avatar
Pekka Pessi committed
226
  su_addrinfo_t *ai;
227
  su_sockaddr_t *from;
Pekka Pessi's avatar
Pekka Pessi committed
228
  socklen_t fromlen;
229 230
  msg_iovec_t iovec[msg_n_fragments] = {{ 0 }};
  uint8_t sample[1];
231 232 233

  /* Simulate packet loss */
  if (self->tp_params->tpp_drop && 
234
      (unsigned)su_randint(0, 1000) < self->tp_params->tpp_drop) {
235
    su_recv(self->tp_socket, sample, 1, 0);
236 237 238 239
    SU_DEBUG_3(("tport(%p): simulated packet loss!\n", self));
    return 0;
  }

240
  assert(self->tp_msg == NULL);
241

242 243 244 245 246 247 248 249 250 251 252 253 254 255 256
#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();
    SU_DEBUG_1(("%s(%p): su_getmsgsize(): %s (%d)\n", __func__, self,
		su_strerror(err), err));
    return -1;
  }
#endif

  veclen = tport_recv_iovec(self, &self->tp_msg, iovec, N, 1);
  if (veclen == -1)
257 258
    return -1;

259
  msg = self->tp_msg;
260

Pekka Pessi's avatar
Pekka Pessi committed
261
  ai = msg_addrinfo(msg);
262
  from = (su_sockaddr_t *)ai->ai_addr, fromlen = (socklen_t)(ai->ai_addrlen);
263

Pekka Pessi's avatar
Pekka Pessi committed
264 265 266 267
  n = su_vrecv(self->tp_socket, iovec, veclen, 0, from, &fromlen);
  
  ai->ai_addrlen = fromlen;
  
268 269
  if (n == SOCKET_ERROR) {
    int error = su_errno();
270
    msg_destroy(msg); self->tp_msg = NULL;
271
    su_seterrno(error);
272

273
    if (su_is_blocking(error))
274 275 276 277 278
      return 0;
    else
      return -1;
  }
  else if (n <= 1) {
Michael Jerris's avatar
Michael Jerris committed
279
    SU_DEBUG_1(("%s(%p): runt of "MOD_ZD" bytes\n", "tport_recv_dgram", self, n));
280 281
    msg_destroy(msg), self->tp_msg = NULL;
    return 0;
282 283 284 285
  }

  SU_CANONIZE_SOCKADDR(from);

286
  if (self->tp_master->mr_dump_file)
287 288
    tport_dump_iovec(self, msg, n, iovec, veclen, "recv", "from");

289
  *sample = *((uint8_t *)iovec[0].mv_base);
290

291 292 293 294 295
  /* Commit received data into buffer. This may relocate iovec contents */
  msg_recv_commit(msg, n, 1);

  if ((sample[0] & 0xf8) == 0xf8)
    /* SigComp */
296 297
    return tport_recv_comp_dgram(self, self->tp_comp, &self->tp_msg, 
				 from, fromlen);
298 299
  else if (sample[0] == 0 || sample[0] == 1)
    /* STUN request or response */
300
    return tport_recv_stun_dgram(self, &self->tp_msg, from, fromlen);
301 302
  else
    return 0;
303 304 305
}

/** Send using su_vsend(). Map IPv4 addresses as IPv6 addresses, if needed. */
306 307 308
ssize_t tport_send_dgram(tport_t const *self, msg_t *msg, 
			 msg_iovec_t iov[], 
			 size_t iovused)
309
{
310 311
  su_sockaddr_t su[1];
  socklen_t sulen = sizeof su;
312 313 314 315

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

316
  msg_get_address(msg, su, &sulen);
317 318 319

#if SU_HAVE_IN6 && defined(IN6_INADDR_TO_V4MAPPED)
  if (su->su_family == AF_INET && self->tp_addrinfo->ai_family == AF_INET6) {
320 321
    su_sockaddr_t su0[1];

322 323 324 325 326 327 328
    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);

329
    memcpy(su, su0, sulen = sizeof(su0->su_sin6));
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
  }
#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();
372
    if (!su_is_blocking(err))
373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
      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