1 /*****************************************************************************
2 * io.c: network I/O functions
3 *****************************************************************************
4 * Copyright (C) 2004-2005, 2007 the VideoLAN team
5 * Copyright © 2005-2006 Rémi Denis-Courmont
8 * Authors: Laurent Aimar <fenrir@videolan.org>
9 * Rémi Denis-Courmont <rem # videolan.org>
10 * Christophe Mutricy <xtophe at videolan dot org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 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 General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
35 #include <vlc_common.h>
47 #ifdef HAVE_SYS_TIME_H
48 # include <sys/time.h>
57 #include <vlc_network.h>
60 # define INADDR_ANY 0x00000000
63 # define INADDR_NONE 0xFFFFFFFF
66 #if defined(WIN32) || defined(UNDER_CE)
68 # define EAFNOSUPPORT WSAEAFNOSUPPORT
71 #ifdef HAVE_LINUX_DCCP_H
72 /* TODO: use glibc instead of linux-kernel headers */
73 # include <linux/dccp.h>
77 extern int rootwrap_bind (int family, int socktype, int protocol,
78 const struct sockaddr *addr, size_t alen);
80 int net_SetupSocket (int fd)
82 #if defined (WIN32) || defined (UNDER_CE)
83 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
85 fcntl (fd, F_SETFD, FD_CLOEXEC);
86 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
89 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
94 int net_Socket (vlc_object_t *p_this, int family, int socktype,
97 int fd = socket (family, socktype, protocol);
100 if (net_errno != EAFNOSUPPORT)
101 msg_Err (p_this, "cannot create socket: %m");
105 net_SetupSocket (fd);
109 * Accepts only IPv6 connections on IPv6 sockets.
110 * If possible, we should open two sockets, but it is not always possible.
112 if (family == AF_INET6)
113 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
116 #if defined (WIN32) || defined (UNDER_CE)
117 # ifndef IPV6_PROTECTION_LEVEL
118 # warning Please update your C library headers.
119 # define IPV6_PROTECTION_LEVEL 23
120 # define PROTECTION_LEVEL_UNRESTRICTED 10
122 if (family == AF_INET6)
123 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
124 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
127 #ifdef DCCP_SOCKOPT_SERVICE
128 if (socktype == SOL_DCCP)
130 char *dccps = var_CreateGetNonEmptyString (p_this, "dccp-service");
133 setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SERVICE, dccps,
134 (strlen (dccps) + 3) & ~3);
144 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
145 int i_port, int protocol)
147 struct addrinfo hints, *res;
148 int socktype = SOCK_DGRAM;
153 socktype = SOCK_STREAM;
160 socktype = SOCK_DCCP;
165 memset (&hints, 0, sizeof( hints ));
166 /* Since we use port numbers rather than service names, the socket type
167 * does not really matter. */
168 hints.ai_socktype = SOCK_DGRAM;
169 hints.ai_flags = AI_PASSIVE;
171 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
173 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
176 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
177 vlc_gai_strerror (i_val));
184 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
186 int fd = net_Socket (p_this, ptr->ai_family, socktype, protocol);
189 msg_Dbg (p_this, "socket error: %m");
193 /* Bind the socket */
194 #if defined (WIN32) || defined (UNDER_CE)
196 * Under Win32 and for multicasting, we bind to INADDR_ANY.
197 * This is of course a severe bug, since the socket would logically
198 * receive unicast traffic, and multicast traffic of groups subscribed
199 * to via other sockets.
201 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
202 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
204 // This works for IPv4 too - don't worry!
205 struct sockaddr_in6 dumb =
207 .sin6_family = ptr->ai_addr->sa_family,
208 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
211 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
215 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
218 #if !defined(WIN32) && !defined(UNDER_CE)
219 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
220 protocol ?: ptr->ai_protocol, ptr->ai_addr,
224 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
229 msg_Err (p_this, "socket bind error (%m)");
234 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
236 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
252 if (listen (fd, INT_MAX))
254 msg_Err (p_this, "socket listen error (%m)");
260 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
263 nsockv[sockc++] = fd;
270 vlc_freeaddrinfo (res);
279 /*****************************************************************************
281 *****************************************************************************
282 * Reads from a network socket.
283 * If waitall is true, then we repeat until we have read the right amount of
284 * data; in that case, a short count means EOF has been reached or the VLC
285 * object has been signaled.
286 *****************************************************************************/
288 __net_Read (vlc_object_t *restrict p_this, int fd, const v_socket_t *vs,
289 uint8_t *restrict p_buf, size_t i_buflen, bool waitall)
292 struct pollfd ufd[2] = {
293 { .fd = fd, .events = POLLIN },
294 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
298 return -1; /* vlc_object_waitpipe() sets errno */
302 ufd[0].revents = ufd[1].revents = 0;
304 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) < 0)
311 #ifndef POLLRDHUP /* This is nice but non-portable */
316 /* Errors (-1) and EOF (0) will be returned on next call,
317 * otherwise we'd "hide" the error from the caller, which is a
319 if (ufd[0].revents & (POLLERR|POLLNVAL|POLLRDHUP))
328 assert (p_this->b_die);
329 msg_Dbg (p_this, "socket %d polling interrupted", fd);
330 #if defined(WIN32) || defined(UNDER_CE)
331 WSASetLastError (WSAEINTR);
339 assert (ufd[0].revents);
344 n = vs->pf_recv (vs->p_sys, p_buf, i_buflen);
349 n = recv (fd, p_buf, i_buflen, 0);
351 n = read (fd, p_buf, i_buflen);
357 #if defined(WIN32) || defined(UNDER_CE)
358 switch (WSAGetLastError ())
361 /* only happens with vs != NULL (TLS) - not really an error */
366 /* On Win32, recv() fails if the datagram doesn't fit inside
367 * the passed buffer, even though the buffer will be filled
368 * with the first part of the datagram. */
369 msg_Err (p_this, "Receive error: "
370 "Increase the mtu size (--mtu option)");
377 case EAGAIN: /* spurious wakeup or no TLS data */
378 case EINTR: /* asynchronous signal */
386 /* For streams, this means end of file, and there will not be any
387 * further data ever on the stream. For datagram sockets, this
388 * means empty datagram, and there could be more data coming.
389 * However, it makes no sense to set <waitall> with datagrams in the
405 msg_Err (p_this, "Read error: %m");
411 /* Write exact amount requested */
412 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
413 const uint8_t *p_data, size_t i_data )
416 struct pollfd ufd[2] = {
417 { .fd = fd, .events = POLLOUT },
418 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
428 ufd[0].revents = ufd[1].revents = 0;
430 if (poll (ufd, 1, -1) == -1)
434 msg_Err (p_this, "Polling error: %m");
439 { /* If POLLHUP resp. POLLERR|POLLNVAL occurs while we have already
440 * read some data, it is important that we first return the number
441 * of bytes read, and then return 0 resp. -1 on the NEXT call. */
442 if (ufd[0].revents & (POLLHUP|POLLERR|POLLNVAL))
444 if (ufd[1].revents) /* VLC object signaled */
451 assert (p_this->b_die);
458 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
461 val = send (fd, p_data, i_data, 0);
463 val = write (fd, p_data, i_data);
470 msg_Err (p_this, "Write error: %m");
479 if ((i_total > 0) || (i_data == 0))
486 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
488 char *psz_line = NULL, *ptr = NULL;
489 size_t i_line = 0, i_max = 0;
494 if( i_line == i_max )
497 psz_line = realloc( psz_line, i_max );
498 ptr = psz_line + i_line;
501 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, true ) != 1 )
520 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
526 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
527 const char *psz_fmt, ... )
531 va_start( args, psz_fmt );
532 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
538 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
539 const char *psz_fmt, va_list args )
544 i_size = vasprintf( &psz, psz_fmt, args );
545 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
553 /*****************************************************************************
554 * inet_pton replacement for obsolete and/or crap operating systems
555 *****************************************************************************/
556 int vlc_inet_pton(int af, const char *src, void *dst)
558 #ifndef HAVE_INET_PTON
560 /* As we already know, Microsoft always go its own way, so even if they do
561 * provide IPv6, they don't provide the API. */
562 struct sockaddr_storage addr;
563 int len = sizeof( addr );
565 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
567 wchar_t *workaround_for_ill_designed_api =
568 malloc( MAX_PATH * sizeof(wchar_t) );
569 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
570 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
572 char *workaround_for_ill_designed_api = strdup( src );
575 if( WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
576 (LPSOCKADDR)&addr, &len ) )
578 free( workaround_for_ill_designed_api );
581 free( workaround_for_ill_designed_api );
586 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
590 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
594 WSASetLastError( WSAEAFNOSUPPORT );
598 /* Assume IPv6 is not supported. */
599 /* Would be safer and more simpler to use inet_aton() but it is most
600 * likely not provided either. */
605 errno = EAFNOSUPPORT;
609 ipv4 = inet_addr( src );
610 if( ipv4 == INADDR_NONE )
613 memcpy( dst, &ipv4, 4 );
616 #else /* HAVE_INET_PTON */
617 return inet_pton( af, src, dst );
618 #endif /* HAVE_INET_PTON */
621 const char *vlc_inet_ntop(int af, const void * src,
622 char * dst, socklen_t cnt)
624 #ifndef HAVE_INET_NTOP
631 struct sockaddr_in6 addr;
632 memset(&addr, 0, sizeof(addr));
633 addr.sin6_family = AF_INET6;
634 addr.sin6_addr = *((struct in6_addr*)src);
635 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
636 sizeof(struct sockaddr_in6),
642 errno = WSAGetLastError();
650 struct sockaddr_in addr;
651 memset(&addr, 0, sizeof(addr));
652 addr.sin_family = AF_INET;
653 addr.sin_addr = *((struct in_addr*)src);
654 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
655 sizeof(struct sockaddr_in),
661 errno = WSAGetLastError();
666 errno = EAFNOSUPPORT;
671 #else /* HAVE_INET_NTOP */
672 return inet_ntop( af, src, dst, cnt );
673 #endif /* HAVE_INET_NTOP */
677 /* vlc_sendmsg, vlc_recvmsg Defined in winsock.c */
679 ssize_t vlc_sendmsg (int s, struct msghdr *hdr, int flags)
681 return sendmsg (s, hdr, flags);
684 ssize_t vlc_recvmsg (int s, struct msghdr *hdr, int flags)
686 return recvmsg (s, hdr, flags);