1 /*****************************************************************************
2 * io.c: network I/O functions
3 *****************************************************************************
4 * Copyright (C) 2004-2005, 2007 VLC authors and VideoLAN
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 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 *****************************************************************************/
35 #include <vlc_common.h>
54 #include <vlc_network.h>
57 # define INADDR_ANY 0x00000000
60 # define INADDR_NONE 0xFFFFFFFF
63 #if defined(WIN32) || defined(UNDER_CE)
65 # define EAFNOSUPPORT WSAEAFNOSUPPORT
68 #ifdef HAVE_LINUX_DCCP_H
69 /* TODO: use glibc instead of linux-kernel headers */
70 # include <linux/dccp.h>
74 #include "libvlc.h" /* vlc_object_waitpipe */
76 extern int rootwrap_bind (int family, int socktype, int protocol,
77 const struct sockaddr *addr, size_t alen);
79 int net_Socket (vlc_object_t *p_this, int family, int socktype,
82 int fd = vlc_socket (family, socktype, protocol, true);
85 if (net_errno != EAFNOSUPPORT)
86 msg_Err (p_this, "cannot create socket: %m");
90 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
94 * Accepts only IPv6 connections on IPv6 sockets.
95 * If possible, we should open two sockets, but it is not always possible.
97 if (family == AF_INET6)
98 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
101 #if defined (WIN32) || defined (UNDER_CE)
102 # ifndef IPV6_PROTECTION_LEVEL
103 # warning Please update your C library headers.
104 # define IPV6_PROTECTION_LEVEL 23
105 # define PROTECTION_LEVEL_UNRESTRICTED 10
107 if (family == AF_INET6)
108 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
109 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
112 #ifdef DCCP_SOCKOPT_SERVICE
113 if (socktype == SOL_DCCP)
115 char *dccps = var_InheritString (p_this, "dccp-service");
118 setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SERVICE, dccps,
119 (strlen (dccps) + 3) & ~3);
129 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
130 int i_port, int type, int protocol)
132 struct addrinfo hints, *res;
134 memset (&hints, 0, sizeof( hints ));
135 hints.ai_socktype = type;
136 hints.ai_protocol = protocol;
137 hints.ai_flags = AI_PASSIVE;
139 msg_Dbg (p_this, "net: listening to %s port %d",
140 (psz_host != NULL) ? psz_host : "*", i_port);
142 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
145 msg_Err (p_this, "Cannot resolve %s port %d : %s",
146 (psz_host != NULL) ? psz_host : "", i_port,
147 gai_strerror (i_val));
154 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
156 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
160 msg_Dbg (p_this, "socket error: %m");
164 /* Bind the socket */
165 #if defined (WIN32) || defined (UNDER_CE)
167 * Under Win32 and for multicasting, we bind to INADDR_ANY.
168 * This is of course a severe bug, since the socket would logically
169 * receive unicast traffic, and multicast traffic of groups subscribed
170 * to via other sockets.
172 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
173 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
175 // This works for IPv4 too - don't worry!
176 struct sockaddr_in6 dumb =
178 .sin6_family = ptr->ai_addr->sa_family,
179 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
182 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
186 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
189 #if !defined(WIN32) && !defined(UNDER_CE)
190 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
192 ptr->ai_addr, ptr->ai_addrlen);
195 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
200 msg_Err (p_this, "socket bind error (%m)");
205 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
207 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
215 switch (ptr->ai_socktype)
223 if (listen (fd, INT_MAX))
225 msg_Err (p_this, "socket listen error (%m)");
231 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
234 nsockv[sockc++] = fd;
250 /*****************************************************************************
252 *****************************************************************************
253 * Reads from a network socket. Cancellation point.
254 * If waitall is true, then we repeat until we have read the right amount of
255 * data; in that case, a short count means EOF has been reached or the VLC
256 * object has been signaled.
257 *****************************************************************************/
259 net_Read (vlc_object_t *restrict p_this, int fd, const v_socket_t *vs,
260 void *restrict p_buf, size_t i_buflen, bool waitall)
263 struct pollfd ufd[2] = {
264 { .fd = fd, .events = POLLIN },
265 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
269 return -1; /* vlc_object_waitpipe() sets errno */
273 ufd[0].revents = ufd[1].revents = 0;
275 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) < 0)
282 #ifndef POLLRDHUP /* This is nice but non-portable */
287 /* Errors (-1) and EOF (0) will be returned on next call,
288 * otherwise we'd "hide" the error from the caller, which is a
290 if (ufd[0].revents & (POLLERR|POLLNVAL|POLLRDHUP))
299 assert (p_this->b_die);
300 msg_Dbg (p_this, "socket %d polling interrupted", fd);
301 #if defined(WIN32) || defined(UNDER_CE)
302 WSASetLastError (WSAEINTR);
310 assert (ufd[0].revents);
313 #if defined(WIN32) || defined(UNDER_CE)
318 int canc = vlc_savecancel ();
319 n = vs->pf_recv (vs->p_sys, p_buf, i_buflen);
320 #if defined(WIN32) || defined(UNDER_CE)
321 /* We must read last error immediately, because vlc_restorecancel()
322 * access thread local storage, and TlsGetValue() will call
323 * SetLastError() to indicate that the function succeeded, thus
324 * overwriting the error code coming from pf_recv().
325 * WSAGetLastError is just an alias for GetLastError these days.
327 error = WSAGetLastError();
329 vlc_restorecancel (canc);
334 n = recv (fd, p_buf, i_buflen, 0);
335 error = WSAGetLastError();
337 n = read (fd, p_buf, i_buflen);
343 #if defined(WIN32) || defined(UNDER_CE)
348 /* only happens with vs != NULL (TLS) - not really an error */
353 /* On Win32, recv() fails if the datagram doesn't fit inside
354 * the passed buffer, even though the buffer will be filled
355 * with the first part of the datagram. */
356 msg_Err (p_this, "Receive error: "
357 "Increase the mtu size (--mtu option)");
364 case EAGAIN: /* spurious wakeup or no TLS data */
365 #if (EAGAIN != EWOULDBLOCK)
368 case EINTR: /* asynchronous signal */
376 /* For streams, this means end of file, and there will not be any
377 * further data ever on the stream. For datagram sockets, this
378 * means empty datagram, and there could be more data coming.
379 * However, it makes no sense to set <waitall> with datagrams in the
385 p_buf = (char *)p_buf + n;
395 msg_Err (p_this, "Read error: %m");
402 * Writes data to a file descriptor.
403 * This blocks until all data is written or an error occurs.
405 * This function is a cancellation point if p_vs is NULL.
406 * This function is not cancellation-safe if p_vs is not NULL.
408 * @return the total number of bytes written, or -1 if an error occurs
409 * before any data is written.
411 ssize_t net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
412 const void *restrict p_data, size_t i_data )
415 struct pollfd ufd[2] = {
416 { .fd = fd, .events = POLLOUT },
417 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
420 if (unlikely(ufd[1].fd == -1))
430 ufd[0].revents = ufd[1].revents = 0;
432 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) == -1)
436 msg_Err (p_this, "Polling error: %m");
441 { /* If POLLHUP resp. POLLERR|POLLNVAL occurs while we have already
442 * read some data, it is important that we first return the number
443 * of bytes read, and then return 0 resp. -1 on the NEXT call. */
444 if (ufd[0].revents & (POLLHUP|POLLERR|POLLNVAL))
446 if (ufd[1].revents) /* VLC object signaled */
453 assert (p_this->b_die);
460 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
463 val = send (fd, p_data, i_data, 0);
465 val = write (fd, p_data, i_data);
472 msg_Err (p_this, "Write error: %m");
476 p_data = (const char *)p_data + val;
481 if (unlikely(i_data == 0))
482 vlc_testcancel (); /* corner case */
484 if ((i_total > 0) || (i_data == 0))
493 * Reads a line from a file descriptor.
494 * This function is not thread-safe; the same file descriptor I/O cannot be
495 * read by another thread at the same time (although it can be written to).
497 * @return nul-terminated heap-allocated string, or NULL on I/O error.
499 char *net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
501 char *psz_line = NULL, *ptr = NULL;
502 size_t i_line = 0, i_max = 0;
507 if( i_line == i_max )
510 psz_line = xrealloc( psz_line, i_max );
511 ptr = psz_line + i_line;
514 if( net_Read( p_this, fd, p_vs, ptr, 1, true ) != 1 )
533 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
540 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
541 const char *psz_fmt, ... )
545 va_start( args, psz_fmt );
546 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
553 ssize_t net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
554 const char *psz_fmt, va_list args )
559 int i_size = vasprintf( &psz, psz_fmt, args );
562 i_ret = net_Write( p_this, fd, p_vs, psz, i_size ) < i_size