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 *****************************************************************************/
43 #ifdef HAVE_SYS_TIME_H
44 # include <sys/time.h>
53 #include <vlc_network.h>
56 # define INADDR_ANY 0x00000000
59 # define INADDR_NONE 0xFFFFFFFF
62 #if defined(WIN32) || defined(UNDER_CE)
64 # define EAFNOSUPPORT WSAEAFNOSUPPORT
67 extern int rootwrap_bind (int family, int socktype, int protocol,
68 const struct sockaddr *addr, size_t alen);
70 int net_SetupSocket (int fd)
72 #if defined (WIN32) || defined (UNDER_CE)
73 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
75 fcntl (fd, F_SETFD, FD_CLOEXEC);
76 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
79 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
84 int net_Socket (vlc_object_t *p_this, int family, int socktype,
87 int fd = socket (family, socktype, protocol);
90 if (net_errno != EAFNOSUPPORT)
91 msg_Err (p_this, "cannot create socket: %s",
92 net_strerror (net_errno));
100 * Accepts only IPv6 connections on IPv6 sockets
101 * (and open an IPv4 socket later as well if needed).
102 * Only Linux and FreeBSD can map IPv4 connections on IPv6 sockets,
103 * so this allows for more uniform handling across platforms. Besides,
104 * it makes sure that IPv4 addresses will be printed as w.x.y.z rather
105 * than ::ffff:w.x.y.z
107 if (family == AF_INET6)
108 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
111 #if defined (WIN32) || defined (UNDER_CE)
112 # ifndef IPV6_PROTECTION_LEVEL
113 # warning Please update your C library headers.
114 # define IPV6_PROTECTION_LEVEL 23
115 # define PROTECTION_LEVEL_UNRESTRICTED 10
117 if (family == AF_INET6)
118 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
119 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
126 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
127 int i_port, int family, int socktype, int protocol)
129 struct addrinfo hints, *res;
131 memset (&hints, 0, sizeof( hints ));
132 hints.ai_family = family;
133 hints.ai_socktype = socktype;
134 hints.ai_flags = AI_PASSIVE;
136 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
138 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
141 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
142 vlc_gai_strerror (i_val));
149 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
151 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
152 protocol ?: ptr->ai_protocol);
155 msg_Dbg (p_this, "socket error: %s", net_strerror (net_errno));
159 /* Bind the socket */
160 #if defined (WIN32) || defined (UNDER_CE)
162 * Under Win32 and for multicasting, we bind to INADDR_ANY.
163 * This is of course a severe bug, since the socket would logically
164 * receive unicast traffic, and multicast traffic of groups subscribed
165 * to via other sockets.
167 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
168 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
170 // This works for IPv4 too - don't worry!
171 struct sockaddr_in6 dumb =
173 .sin6_family = ptr->ai_addr->sa_family,
174 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
177 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
181 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
183 int saved_errno = net_errno;
186 #if !defined(WIN32) && !defined(UNDER_CE)
187 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
188 protocol ?: ptr->ai_protocol, ptr->ai_addr,
192 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
197 msg_Err (p_this, "socket bind error (%s)",
198 net_strerror( saved_errno ) );
203 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
205 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
213 switch (ptr->ai_socktype)
218 if (listen (fd, INT_MAX))
220 msg_Err (p_this, "socket listen error (%s)",
221 net_strerror (net_errno));
227 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
230 nsockv[sockc++] = fd;
237 vlc_freeaddrinfo (res);
246 int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
247 int family, int socktype, int protocol)
249 int *fdv = net_Listen (obj, host, port, family, socktype, protocol);
253 for (unsigned i = 1; fdv[i] != -1; i++)
255 msg_Warn (obj, "Multiple sockets opened. Dropping extra ones!");
268 /*****************************************************************************
270 *****************************************************************************
271 * Close a network handle
272 *****************************************************************************/
273 void net_Close (int fd)
276 CloseHandle ((HANDLE)fd);
277 #elif defined (WIN32)
286 net_ReadInner (vlc_object_t *restrict p_this, unsigned fdc, const int *fdv,
287 const v_socket_t *const *restrict vsv,
288 uint8_t *restrict p_buf, size_t i_buflen,
289 vlc_bool_t dontwait, vlc_bool_t waitall)
297 #if defined(WIN32) || defined(UNDER_CE)
298 WSASetLastError(WSAEINTR);
305 struct pollfd ufd[fdc];
307 for (unsigned i = 0; i < fdc; i++)
310 ufd[i].events = POLLIN;
314 switch (poll (ufd, fdc, dontwait ? 0 : 500))
323 for (unsigned i = 0;; i++)
325 assert (i < fdc); /* no events found = bug ! */
327 if (ufd[i].revents == 0)
332 // Errors (-1) and EOF (0) will be returned on next run
333 if (ufd[i].revents & (POLLERR|POLLNVAL|POLLHUP))
338 if (ufd[i].revents & POLLHUP)
339 return 0; // EOF, read() would yield 0
351 n = (*vsv)->pf_recv ((*vsv)->p_sys, p_buf, i_buflen);
355 #if defined(WIN32) || defined(UNDER_CE)
356 n = recv (*fdv, p_buf, i_buflen, 0);
358 n = read (*fdv, p_buf, i_buflen);
364 #if defined(WIN32) || defined(UNDER_CE)
365 switch (WSAGetLastError())
368 /* only happens with vs != NULL (SSL) - not really an error */
373 /* On Win32, recv() fails if the datagram doesn't fit inside
374 * the passed buffer, even though the buffer will be filled
375 * with the first part of the datagram. */
376 msg_Err (p_this, "Receive error: "
377 "Increase the mtu size (--mtu option)");
385 if (errno == EAGAIN) /* spurious wake-up (sucks if fdc > 1) */
395 if ((n == 0) || dontwait || !waitall)
401 msg_Err (p_this, "Read error: %s", net_strerror (net_errno));
402 return i_total ? (ssize_t)i_total : -1;
406 /*****************************************************************************
408 *****************************************************************************
409 * Read from a network socket
410 * If b_retry is true, then we repeat until we have read the right amount of
411 * data; in that case, a short count means EOF has been reached.
412 *****************************************************************************/
413 ssize_t __net_Read( vlc_object_t *restrict p_this, int fd,
414 const v_socket_t *restrict p_vs,
415 uint8_t *restrict buf, size_t len, vlc_bool_t b_retry )
417 return net_ReadInner( p_this, 1, &(int){ fd },
418 &(const v_socket_t *){ p_vs },
419 buf, len, VLC_FALSE, b_retry );
423 /*****************************************************************************
424 * __net_ReadNonBlock:
425 *****************************************************************************
426 * Read from a network socket, non blocking mode.
427 * This function should only be used after a poll() (or select(), but you
428 * should use poll instead of select()) invocation to avoid busy loops.
429 *****************************************************************************/
430 ssize_t __net_ReadNonBlock( vlc_object_t *restrict p_this, int fd,
431 const v_socket_t *restrict p_vs,
432 uint8_t *restrict buf, size_t len )
434 return net_ReadInner (p_this, 1, &(int){ fd },
435 &(const v_socket_t *){ p_vs },
436 buf, len, VLC_TRUE, VLC_FALSE);
440 /*****************************************************************************
442 *****************************************************************************
443 * Read from several sockets. Takes data from the first socket that has some.
444 *****************************************************************************/
445 ssize_t __net_Select( vlc_object_t *restrict p_this,
446 const int *restrict fds, int nfd,
447 uint8_t *restrict buf, size_t len )
449 const v_socket_t *vsv[nfd];
450 memset( vsv, 0, sizeof (vsv) );
452 return net_ReadInner( p_this, nfd, fds, vsv,
453 buf, len, VLC_FALSE, VLC_FALSE );
457 /* Write exact amount requested */
458 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
459 const uint8_t *p_data, size_t i_data )
468 struct pollfd ufd[1];
469 memset (ufd, 0, sizeof (ufd));
471 ufd[0].events = POLLOUT;
473 int val = poll (ufd, 1, 500);
477 msg_Err (p_this, "Write error: %s", net_strerror (net_errno));
484 if ((ufd[0].revents & POLLERR) && (i_total > 0))
485 return i_total; // error will be dequeued separately on next call
488 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
490 #if defined(WIN32) || defined(UNDER_CE)
491 val = send (fd, p_data, i_data, 0);
493 val = write (fd, p_data, i_data);
498 msg_Err (p_this, "Write error: %s", net_strerror (net_errno));
510 if ((i_total > 0) || (i_data == 0))
516 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
518 char *psz_line = NULL, *ptr = NULL;
519 size_t i_line = 0, i_max = 0;
524 if( i_line == i_max )
527 psz_line = realloc( psz_line, i_max );
528 ptr = psz_line + i_line;
531 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
550 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
556 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
557 const char *psz_fmt, ... )
561 va_start( args, psz_fmt );
562 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
568 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
569 const char *psz_fmt, va_list args )
574 i_size = vasprintf( &psz, psz_fmt, args );
575 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
583 /*****************************************************************************
584 * inet_pton replacement for obsolete and/or crap operating systems
585 *****************************************************************************/
586 #ifndef HAVE_INET_PTON
587 int inet_pton(int af, const char *src, void *dst)
590 /* As we already know, Microsoft always go its own way, so even if they do
591 * provide IPv6, they don't provide the API. */
592 struct sockaddr_storage addr;
593 int len = sizeof( addr );
595 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
597 wchar_t *workaround_for_ill_designed_api =
598 malloc( MAX_PATH * sizeof(wchar_t) );
599 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
600 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
602 char *workaround_for_ill_designed_api = strdup( src );
605 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
606 (LPSOCKADDR)&addr, &len ) )
608 free( workaround_for_ill_designed_api );
611 free( workaround_for_ill_designed_api );
616 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
620 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
624 WSASetLastError( WSAEAFNOSUPPORT );
628 /* Assume IPv6 is not supported. */
629 /* Would be safer and more simpler to use inet_aton() but it is most
630 * likely not provided either. */
635 errno = EAFNOSUPPORT;
639 ipv4 = inet_addr( src );
640 if( ipv4 == INADDR_NONE )
643 memcpy( dst, &ipv4, 4 );
647 #endif /* HAVE_INET_PTON */
649 #ifndef HAVE_INET_NTOP
651 const char *inet_ntop(int af, const void * src,
652 char * dst, socklen_t cnt)
659 struct sockaddr_in6 addr;
660 memset(&addr, 0, sizeof(addr));
661 addr.sin6_family = AF_INET6;
662 addr.sin6_addr = *((struct in6_addr*)src);
663 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
664 sizeof(struct sockaddr_in6),
670 errno = WSAGetLastError();
678 struct sockaddr_in addr;
679 memset(&addr, 0, sizeof(addr));
680 addr.sin_family = AF_INET;
681 addr.sin_addr = *((struct in_addr*)src);
682 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
683 sizeof(struct sockaddr_in),
689 errno = WSAGetLastError();
694 errno = EAFNOSUPPORT;