1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2004-2006 VLC authors and VideoLAN
5 * Copyright © 2006-2007 Rémi Denis-Courmont
9 * Authors: Laurent Aimar <fenrir@videolan.org>
10 * Rémi Denis-Courmont <rem # videolan.org>
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
34 #include <vlc_common.h>
39 #include <vlc_network.h>
43 # define EAFNOSUPPORT WSAEAFNOSUPPORT
51 #ifdef HAVE_LINUX_DCCP_H
52 # include <linux/dccp.h>
53 # ifndef SOCK_DCCP /* provisional API */
59 # define SOL_IP IPPROTO_IP
62 # define SOL_IPV6 IPPROTO_IPV6
65 # define IPPROTO_IPV6 41 /* IANA */
68 # define SOL_DCCP IPPROTO_DCCP
71 # define IPPROTO_DCCP 33 /* IANA */
74 # define SOL_UDPLITE IPPROTO_UDPLITE
76 #ifndef IPPROTO_UDPLITE
77 # define IPPROTO_UDPLITE 136 /* IANA */
80 #if defined (HAVE_NETINET_UDPLITE_H)
81 # include <netinet/udplite.h>
82 #elif defined (__linux__)
83 /* still missing from glibc 2.6 */
84 # define UDPLITE_SEND_CSCOV 10
85 # define UDPLITE_RECV_CSCOV 11
88 extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
92 static int net_SetupDgramSocket (vlc_object_t *p_obj, int fd,
93 const struct addrinfo *ptr)
96 setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int));
101 /* Check windows version so we know if we need to increase receive buffers
102 * for Windows 7 and earlier
104 * SetSocketMediaStreamingMode is present in win 8 and later, so we set
105 * receive buffer if that isn't present
107 HINSTANCE h_Network = LoadLibraryW(L"Windows.Networking.dll");
108 if( (h_Network == NULL) ||
109 (GetProcAddress( h_Network, "SetSocketMediaStreamingMode" ) == NULL ) )
111 setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
112 (void *)&(int){ 0x80000 }, sizeof (int));
115 FreeLibrary( h_Network );
117 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
118 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
120 // This works for IPv4 too - don't worry!
121 struct sockaddr_in6 dumb =
123 .sin6_family = ptr->ai_addr->sa_family,
124 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
127 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
131 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
133 msg_Err( p_obj, "socket bind error: %s", vlc_strerror_c(net_errno) );
141 static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
144 struct addrinfo hints = {
145 .ai_socktype = SOCK_DGRAM,
146 .ai_protocol = protocol,
147 .ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_IDN,
153 msg_Dbg (obj, "net: opening %s datagram port %d",
154 host ? host : "any", port);
156 int val = vlc_getaddrinfo (host, port, &hints, &res);
159 msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
166 for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
168 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
172 msg_Dbg (obj, "socket error: %s", vlc_strerror_c(net_errno));
177 /* Try dual-mode IPv6 if available. */
178 if (ptr->ai_family == AF_INET6)
179 setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 }, sizeof (int));
181 fd = net_SetupDgramSocket( obj, fd, ptr );
185 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
186 && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
201 static int net_SetMcastHopLimit( vlc_object_t *p_this,
202 int fd, int family, int hlim )
206 /* There is some confusion in the world whether IP_MULTICAST_TTL
207 * takes a byte or an int as an argument.
208 * BSD seems to indicate byte so we are going with that and use
209 * int as a fallback to be safe */
212 #ifdef IP_MULTICAST_TTL
215 cmd = IP_MULTICAST_TTL;
219 #ifdef IPV6_MULTICAST_HOPS
222 cmd = IPV6_MULTICAST_HOPS;
227 errno = EAFNOSUPPORT;
228 msg_Warn( p_this, "%s", vlc_strerror_c(EAFNOSUPPORT) );
232 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
234 /* BSD compatibility */
237 msg_Dbg( p_this, "cannot set hop limit (%d): %s", hlim,
238 vlc_strerror_c(net_errno) );
239 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
240 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
242 msg_Err( p_this, "cannot set hop limit (%d): %s", hlim,
243 vlc_strerror_c(net_errno) );
252 static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
255 int scope = if_nametoindex (iface);
258 msg_Err (p_this, "invalid multicast interface: %s", iface);
264 #ifdef IPV6_MULTICAST_IF
266 if (setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
267 &scope, sizeof (scope)) == 0)
275 struct ip_mreqn req = { .imr_ifindex = scope };
276 if (setsockopt (fd, SOL_IP, IP_MULTICAST_IF,
277 &req, sizeof (req)) == 0)
283 errno = EAFNOSUPPORT;
285 msg_Err (p_this, "cannot force multicast interface %s: %s", iface,
286 vlc_strerror_c(errno));
291 static unsigned var_GetIfIndex (vlc_object_t *obj)
293 char *ifname = var_InheritString (obj, "miface");
297 unsigned ifindex = if_nametoindex (ifname);
299 msg_Err (obj, "invalid multicast interface: %s", ifname);
306 * IP-agnostic multicast join,
307 * with fallback to old APIs, and fallback from SSM to ASM.
310 net_SourceSubscribe (vlc_object_t *obj, int fd,
311 const struct sockaddr *src, socklen_t srclen,
312 const struct sockaddr *grp, socklen_t grplen)
314 /* MCAST_JOIN_SOURCE_GROUP was introduced to OS X in v10.7, but it doesn't work,
315 * so ignore it to use the same code path as on 10.5 or 10.6 */
316 #if defined (MCAST_JOIN_SOURCE_GROUP) && !defined (__APPLE__)
317 /* Agnostic SSM multicast join */
319 struct group_source_req gsr;
321 memset (&gsr, 0, sizeof (gsr));
322 gsr.gsr_interface = var_GetIfIndex (obj);
324 switch (grp->sa_family)
329 const struct sockaddr_in6 *g6 = (const struct sockaddr_in6 *)grp;
332 assert (grplen >= sizeof (struct sockaddr_in6));
333 if (g6->sin6_scope_id != 0)
334 gsr.gsr_interface = g6->sin6_scope_id;
342 errno = EAFNOSUPPORT;
346 assert (grplen <= sizeof (gsr.gsr_group));
347 memcpy (&gsr.gsr_source, src, srclen);
348 assert (srclen <= sizeof (gsr.gsr_source));
349 memcpy (&gsr.gsr_group, grp, grplen);
350 if (setsockopt (fd, level, MCAST_JOIN_SOURCE_GROUP,
351 &gsr, sizeof (gsr)) == 0)
355 if (src->sa_family != grp->sa_family)
357 errno = EAFNOSUPPORT;
361 switch (grp->sa_family)
363 # ifdef IP_ADD_SOURCE_MEMBERSHIP
364 /* IPv4-specific API */
367 struct ip_mreq_source imr;
369 memset (&imr, 0, sizeof (imr));
370 assert (grplen >= sizeof (struct sockaddr_in));
371 imr.imr_multiaddr = ((const struct sockaddr_in *)grp)->sin_addr;
372 assert (srclen >= sizeof (struct sockaddr_in));
373 imr.imr_sourceaddr = ((const struct sockaddr_in *)src)->sin_addr;
374 if (setsockopt (fd, SOL_IP, IP_ADD_SOURCE_MEMBERSHIP,
375 &imr, sizeof (imr)) == 0)
381 errno = EAFNOSUPPORT;
385 msg_Err (obj, "cannot join source multicast group: %s",
386 vlc_strerror_c(net_errno));
387 msg_Warn (obj, "trying ASM instead of SSM...");
388 return net_Subscribe (obj, fd, grp, grplen);
392 int net_Subscribe (vlc_object_t *obj, int fd,
393 const struct sockaddr *grp, socklen_t grplen)
395 /* MCAST_JOIN_GROUP was introduced to OS X in v10.7, but it doesn't work,
396 * so ignore it to use the same code as on 10.5 or 10.6 */
397 #if defined (MCAST_JOIN_GROUP) && !defined (__APPLE__)
398 /* Agnostic SSM multicast join */
402 memset (&gr, 0, sizeof (gr));
403 gr.gr_interface = var_GetIfIndex (obj);
405 switch (grp->sa_family)
410 const struct sockaddr_in6 *g6 = (const struct sockaddr_in6 *)grp;
413 assert (grplen >= sizeof (struct sockaddr_in6));
414 if (g6->sin6_scope_id != 0)
415 gr.gr_interface = g6->sin6_scope_id;
423 errno = EAFNOSUPPORT;
427 assert (grplen <= sizeof (gr.gr_group));
428 memcpy (&gr.gr_group, grp, grplen);
429 if (setsockopt (fd, level, MCAST_JOIN_GROUP, &gr, sizeof (gr)) == 0)
433 switch (grp->sa_family)
435 # ifdef IPV6_JOIN_GROUP
438 struct ipv6_mreq ipv6mr;
439 const struct sockaddr_in6 *g6 = (const struct sockaddr_in6 *)grp;
441 memset (&ipv6mr, 0, sizeof (ipv6mr));
442 assert (grplen >= sizeof (struct sockaddr_in6));
443 ipv6mr.ipv6mr_multiaddr = g6->sin6_addr;
444 ipv6mr.ipv6mr_interface = g6->sin6_scope_id;
445 if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP,
446 &ipv6mr, sizeof (ipv6mr)))
451 # ifdef IP_ADD_MEMBERSHIP
456 memset (&imr, 0, sizeof (imr));
457 assert (grplen >= sizeof (struct sockaddr_in));
458 imr.imr_multiaddr = ((const struct sockaddr_in *)grp)->sin_addr;
459 if (setsockopt (fd, SOL_IP, IP_ADD_MEMBERSHIP,
460 &imr, sizeof (imr)) == 0)
466 errno = EAFNOSUPPORT;
470 msg_Err (obj, "cannot join multicast group: %s",
471 vlc_strerror_c(net_errno));
476 static int net_SetDSCP( int fd, uint8_t dscp )
478 struct sockaddr_storage addr;
479 if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
484 switch( addr.ss_family )
505 return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
508 #undef net_ConnectDgram
509 /*****************************************************************************
511 *****************************************************************************
512 * Open a datagram socket to send data to a defined destination, with an
513 * optional hop limit.
514 *****************************************************************************/
515 int net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
516 int i_hlim, int proto )
518 struct addrinfo hints = {
519 .ai_socktype = SOCK_DGRAM,
520 .ai_protocol = proto,
521 .ai_flags = AI_NUMERICSERV | AI_IDN,
524 bool b_unreach = false;
527 i_hlim = var_InheritInteger( p_this, "ttl" );
529 msg_Dbg( p_this, "net: connecting to [%s]:%d", psz_host, i_port );
531 int val = vlc_getaddrinfo (psz_host, i_port, &hints, &res);
534 msg_Err (p_this, "cannot resolve [%s]:%d : %s", psz_host, i_port,
539 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
542 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
547 /* Allow broadcast sending */
548 setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
551 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
553 str = var_InheritString (p_this, "miface");
556 net_SetMcastOut (p_this, fd, ptr->ai_family, str);
560 net_SetDSCP (fd, var_InheritInteger (p_this, "dscp"));
562 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
569 #if defined( _WIN32 )
570 if( WSAGetLastError () == WSAENETUNREACH )
572 if( errno == ENETUNREACH )
576 msg_Warn( p_this, "%s port %d : %s", psz_host, i_port,
577 vlc_strerror_c(errno) );
586 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
595 /*****************************************************************************
597 *****************************************************************************
598 * OpenDgram a datagram socket and return a handle
599 *****************************************************************************/
600 int net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind,
601 const char *psz_server, int i_server, int protocol )
603 if ((psz_server == NULL) || (psz_server[0] == '\0'))
604 return net_ListenSingle (obj, psz_bind, i_bind, protocol);
606 msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
607 psz_server, i_server, psz_bind, i_bind);
609 struct addrinfo hints = {
610 .ai_socktype = SOCK_DGRAM,
611 .ai_protocol = protocol,
612 .ai_flags = AI_NUMERICSERV | AI_IDN,
615 int val = vlc_getaddrinfo (psz_server, i_server, &hints, &rem);
618 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
623 hints.ai_flags |= AI_PASSIVE;
624 val = vlc_getaddrinfo (psz_bind, i_bind, &hints, &loc);
627 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
634 for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
636 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
639 continue; // usually, address family not supported
641 fd = net_SetupDgramSocket( obj, fd, ptr );
645 for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
647 if ((ptr2->ai_family != ptr->ai_family)
648 || (ptr2->ai_socktype != ptr->ai_socktype)
649 || (ptr2->ai_protocol != ptr->ai_protocol))
652 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
653 ? net_SourceSubscribe (obj, fd,
654 ptr2->ai_addr, ptr2->ai_addrlen,
655 ptr->ai_addr, ptr->ai_addrlen)
656 : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
658 msg_Err (obj, "cannot connect to %s port %d: %s",
659 psz_server, i_server, vlc_strerror_c(net_errno));
680 * Sets the send and receive checksum coverage of a socket:
682 * @param sendcov payload coverage of sent packets (bytes), -1 for full
683 * @param recvcov minimum payload coverage of received packets, -1 for full
685 int net_SetCSCov (int fd, int sendcov, int recvcov)
689 if (getsockopt (fd, SOL_SOCKET, SO_TYPE,
690 &type, &(socklen_t){ sizeof (type) }))
695 #ifdef UDPLITE_RECV_CSCOV
696 case SOCK_DGRAM: /* UDP-Lite */
700 sendcov += 8; /* partial */
701 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov,
709 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV,
710 &recvcov, sizeof (recvcov)))
715 #ifdef DCCP_SOCKOPT_SEND_CSCOV
716 case SOCK_DCCP: /* DCCP and its ill-named socket type */
717 if ((sendcov == -1) || (sendcov > 56))
720 sendcov = (sendcov + 3) / 4;
721 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV,
722 &sendcov, sizeof (sendcov)))
725 if ((recvcov == -1) || (recvcov > 56))
728 recvcov = (recvcov + 3) / 4;
729 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
730 &recvcov, sizeof (recvcov)))
736 #if !defined( UDPLITE_RECV_CSCOV ) && !defined( DCCP_SOCKOPT_SEND_CSCOV )