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 #include "libvlc.h" /* vlc_object_waitpipe */
79 extern int rootwrap_bind (int family, int socktype, int protocol,
80 const struct sockaddr *addr, size_t alen);
82 int net_SetupSocket (int fd)
84 #if defined (WIN32) || defined (UNDER_CE)
85 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
87 fcntl (fd, F_SETFD, FD_CLOEXEC);
88 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
91 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
96 int net_Socket (vlc_object_t *p_this, int family, int socktype,
99 int fd = socket (family, socktype, protocol);
102 if (net_errno != EAFNOSUPPORT)
103 msg_Err (p_this, "cannot create socket: %m");
107 net_SetupSocket (fd);
111 * Accepts only IPv6 connections on IPv6 sockets.
112 * If possible, we should open two sockets, but it is not always possible.
114 if (family == AF_INET6)
115 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
118 #if defined (WIN32) || defined (UNDER_CE)
119 # ifndef IPV6_PROTECTION_LEVEL
120 # warning Please update your C library headers.
121 # define IPV6_PROTECTION_LEVEL 23
122 # define PROTECTION_LEVEL_UNRESTRICTED 10
124 if (family == AF_INET6)
125 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
126 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
129 #ifdef DCCP_SOCKOPT_SERVICE
130 if (socktype == SOL_DCCP)
132 char *dccps = var_CreateGetNonEmptyString (p_this, "dccp-service");
135 setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SERVICE, dccps,
136 (strlen (dccps) + 3) & ~3);
146 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
147 int i_port, int protocol)
149 struct addrinfo hints, *res;
150 int socktype = SOCK_DGRAM;
155 socktype = SOCK_STREAM;
162 socktype = SOCK_DCCP;
167 memset (&hints, 0, sizeof( hints ));
168 /* Since we use port numbers rather than service names, the socket type
169 * does not really matter. */
170 hints.ai_socktype = SOCK_DGRAM;
171 hints.ai_flags = AI_PASSIVE;
173 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
175 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
178 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
179 vlc_gai_strerror (i_val));
186 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
188 int fd = net_Socket (p_this, ptr->ai_family, socktype, protocol);
191 msg_Dbg (p_this, "socket error: %m");
195 /* Bind the socket */
196 #if defined (WIN32) || defined (UNDER_CE)
198 * Under Win32 and for multicasting, we bind to INADDR_ANY.
199 * This is of course a severe bug, since the socket would logically
200 * receive unicast traffic, and multicast traffic of groups subscribed
201 * to via other sockets.
203 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
204 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
206 // This works for IPv4 too - don't worry!
207 struct sockaddr_in6 dumb =
209 .sin6_family = ptr->ai_addr->sa_family,
210 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
213 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
217 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
220 #if !defined(WIN32) && !defined(UNDER_CE)
221 fd = rootwrap_bind (ptr->ai_family, socktype,
222 protocol ?: ptr->ai_protocol, ptr->ai_addr,
226 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
231 msg_Err (p_this, "socket bind error (%m)");
236 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
238 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
254 if (listen (fd, INT_MAX))
256 msg_Err (p_this, "socket listen error (%m)");
262 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
265 nsockv[sockc++] = fd;
272 vlc_freeaddrinfo (res);
281 /*****************************************************************************
283 *****************************************************************************
284 * Reads from a network socket. Cancellation point.
285 * If waitall is true, then we repeat until we have read the right amount of
286 * data; in that case, a short count means EOF has been reached or the VLC
287 * object has been signaled.
288 *****************************************************************************/
290 __net_Read (vlc_object_t *restrict p_this, int fd, const v_socket_t *vs,
291 void *restrict p_buf, size_t i_buflen, bool waitall)
294 struct pollfd ufd[2] = {
295 { .fd = fd, .events = POLLIN },
296 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
300 return -1; /* vlc_object_waitpipe() sets errno */
304 ufd[0].revents = ufd[1].revents = 0;
306 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) < 0)
313 #ifndef POLLRDHUP /* This is nice but non-portable */
318 /* Errors (-1) and EOF (0) will be returned on next call,
319 * otherwise we'd "hide" the error from the caller, which is a
321 if (ufd[0].revents & (POLLERR|POLLNVAL|POLLRDHUP))
330 assert (p_this->b_die);
331 msg_Dbg (p_this, "socket %d polling interrupted", fd);
332 #if defined(WIN32) || defined(UNDER_CE)
333 WSASetLastError (WSAEINTR);
341 assert (ufd[0].revents);
346 int canc = vlc_savecancel ();
347 n = vs->pf_recv (vs->p_sys, p_buf, i_buflen);
348 vlc_restorecancel (canc);
353 n = recv (fd, p_buf, i_buflen, 0);
355 n = read (fd, p_buf, i_buflen);
361 #if defined(WIN32) || defined(UNDER_CE)
362 switch (WSAGetLastError ())
365 /* only happens with vs != NULL (TLS) - not really an error */
370 /* On Win32, recv() fails if the datagram doesn't fit inside
371 * the passed buffer, even though the buffer will be filled
372 * with the first part of the datagram. */
373 msg_Err (p_this, "Receive error: "
374 "Increase the mtu size (--mtu option)");
381 case EAGAIN: /* spurious wakeup or no TLS data */
382 #if (EAGAIN != EWOULDBLOCK)
385 case EINTR: /* asynchronous signal */
393 /* For streams, this means end of file, and there will not be any
394 * further data ever on the stream. For datagram sockets, this
395 * means empty datagram, and there could be more data coming.
396 * However, it makes no sense to set <waitall> with datagrams in the
402 p_buf = (char *)p_buf + n;
412 msg_Err (p_this, "Read error: %m");
418 /* Write exact amount requested */
419 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
420 const void *restrict p_data, size_t i_data )
423 struct pollfd ufd[2] = {
424 { .fd = fd, .events = POLLOUT },
425 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
435 ufd[0].revents = ufd[1].revents = 0;
437 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) == -1)
441 msg_Err (p_this, "Polling error: %m");
446 { /* If POLLHUP resp. POLLERR|POLLNVAL occurs while we have already
447 * read some data, it is important that we first return the number
448 * of bytes read, and then return 0 resp. -1 on the NEXT call. */
449 if (ufd[0].revents & (POLLHUP|POLLERR|POLLNVAL))
451 if (ufd[1].revents) /* VLC object signaled */
458 assert (p_this->b_die);
465 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
468 val = send (fd, p_data, i_data, 0);
470 val = write (fd, p_data, i_data);
477 msg_Err (p_this, "Write error: %m");
481 p_data = (const char *)p_data + val;
486 if ((i_total > 0) || (i_data == 0))
494 * Reads a line from a file descriptor.
495 * This function is not thread-safe; the same file descriptor cI/O annot be read
496 * by another thread at the same time (although it can be written to).
498 * @return nul-terminated heap-allocated string, or NULL on I/O error.
500 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
502 char *psz_line = NULL, *ptr = NULL;
503 size_t i_line = 0, i_max = 0;
508 if( i_line == i_max )
511 psz_line = realloc( psz_line, i_max );
512 ptr = psz_line + i_line;
515 if( net_Read( p_this, fd, p_vs, ptr, 1, true ) != 1 )
534 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 );
552 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
553 const char *psz_fmt, va_list args )
558 int i_size = vasprintf( &psz, psz_fmt, args );
561 i_ret = __net_Write( p_this, fd, p_vs, psz, i_size ) < i_size