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a34fc5e23d
FFmpeg/libavformat/os_support.c
Reimar Döffinger a34fc5e23d Make our getaddrinfo implementation initialize "struct addrinfo" return 
value to NULL on errors.

Originally committed as revision 22122 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-02-28 22:31:17 +00:00

339 lines
9.5 KiB
C
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/*
* Various utilities for ffmpeg system
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
* copyright (c) 2002 Francois Revol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* needed by inet_aton() */
#define _SVID_SOURCE
#include "config.h"
#include "avformat.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/time.h>
#include "os_support.h"
#if CONFIG_NETWORK
#if !HAVE_POLL_H
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#elif HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif
#include "network.h"
#if !HAVE_INET_ATON
#include <stdlib.h>
#include <strings.h>
int inet_aton (const char * str, struct in_addr * add)
{
unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
return 0;
if (!add1 || (add1|add2|add3|add4) > 255) return 0;
add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);
return 1;
}
#endif /* !HAVE_INET_ATON */
#if !HAVE_GETADDRINFO
int ff_getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints, struct addrinfo **res)
{
struct hostent *h = NULL;
struct addrinfo *ai;
struct sockaddr_in *sin;
#if HAVE_WINSOCK2_H
int (WSAAPI *win_getaddrinfo)(const char *node, const char *service,
const struct addrinfo *hints,
struct addrinfo **res);
HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
win_getaddrinfo = GetProcAddress(ws2mod, "getaddrinfo");
if (win_getaddrinfo)
return win_getaddrinfo(node, service, hints, res);
#endif
*res = NULL;
sin = av_mallocz(sizeof(struct sockaddr_in));
if (!sin)
return EAI_FAIL;
sin->sin_family = AF_INET;
if (node) {
if (!inet_aton(node, &sin->sin_addr)) {
if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
av_free(sin);
return EAI_FAIL;
}
h = gethostbyname(node);
if (!h) {
av_free(sin);
return EAI_FAIL;
}
memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
}
} else {
if (hints && (hints->ai_flags & AI_PASSIVE)) {
sin->sin_addr.s_addr = INADDR_ANY;
} else
sin->sin_addr.s_addr = INADDR_LOOPBACK;
}
/* Note: getaddrinfo allows service to be a string, which
* should be looked up using getservbyname. */
if (service)
sin->sin_port = htons(atoi(service));
ai = av_mallocz(sizeof(struct addrinfo));
if (!ai) {
av_free(sin);
return EAI_FAIL;
}
*res = ai;
ai->ai_family = AF_INET;
ai->ai_socktype = hints ? hints->ai_socktype : 0;
switch (ai->ai_socktype) {
case SOCK_STREAM: ai->ai_protocol = IPPROTO_TCP; break;
case SOCK_DGRAM: ai->ai_protocol = IPPROTO_UDP; break;
default: ai->ai_protocol = 0; break;
}
ai->ai_addr = (struct sockaddr *)sin;
ai->ai_addrlen = sizeof(struct sockaddr_in);
if (hints && (hints->ai_flags & AI_CANONNAME))
ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
ai->ai_next = NULL;
return 0;
}
void ff_freeaddrinfo(struct addrinfo *res)
{
#if HAVE_WINSOCK2_H
void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
GetProcAddress(ws2mod, "freeaddrinfo");
if (win_freeaddrinfo) {
win_freeaddrinfo(res);
return;
}
#endif
av_free(res->ai_canonname);
av_free(res->ai_addr);
av_free(res);
}
int ff_getnameinfo(const struct sockaddr *sa, int salen,
char *host, int hostlen,
char *serv, int servlen, int flags)
{
const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
#if HAVE_WINSOCK2_H
int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
char *host, DWORD hostlen,
char *serv, DWORD servlen, int flags);
HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
if (win_getnameinfo)
return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
#endif
if (sa->sa_family != AF_INET)
return EAI_FAMILY;
if (!host && !serv)
return EAI_NONAME;
if (host && hostlen > 0) {
struct hostent *ent = NULL;
uint32_t a;
if (!(flags & NI_NUMERICHOST))
ent = gethostbyaddr((const char *)&sin->sin_addr,
sizeof(sin->sin_addr), AF_INET);
if (ent) {
snprintf(host, hostlen, "%s", ent->h_name);
} else if (flags & NI_NAMERQD) {
return EAI_NONAME;
} else {
a = ntohl(sin->sin_addr.s_addr);
snprintf(host, hostlen, "%d.%d.%d.%d",
((a >> 24) & 0xff), ((a >> 16) & 0xff),
((a >> 8) & 0xff), ( a & 0xff));
}
}
if (serv && servlen > 0) {
struct servent *ent = NULL;
if (!(flags & NI_NUMERICSERV))
ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
if (ent) {
snprintf(serv, servlen, "%s", ent->s_name);
} else
snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
}
return 0;
}
const char *ff_gai_strerror(int ecode)
{
switch(ecode) {
case EAI_FAIL : return "A non-recoverable error occurred";
case EAI_FAMILY : return "The address family was not recognized or the address length was invalid for the specified family";
case EAI_NONAME : return "The name does not resolve for the supplied parameters";
}
return "Unknown error";
}
#endif
/* resolve host with also IP address parsing */
int resolve_host(struct in_addr *sin_addr, const char *hostname)
{
if (!inet_aton(hostname, sin_addr)) {
#if HAVE_GETADDRINFO
struct addrinfo *ai, *cur;
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
if (getaddrinfo(hostname, NULL, &hints, &ai))
return -1;
/* getaddrinfo returns a linked list of addrinfo structs.
* Even if we set ai_family = AF_INET above, make sure
* that the returned one actually is of the correct type. */
for (cur = ai; cur; cur = cur->ai_next) {
if (cur->ai_family == AF_INET) {
*sin_addr = ((struct sockaddr_in *)cur->ai_addr)->sin_addr;
freeaddrinfo(ai);
return 0;
}
}
freeaddrinfo(ai);
return -1;
#else
struct hostent *hp;
hp = gethostbyname(hostname);
if (!hp)
return -1;
memcpy(sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
#endif
}
return 0;
}
int ff_socket_nonblock(int socket, int enable)
{
#if HAVE_WINSOCK2_H
return ioctlsocket(socket, FIONBIO, &enable);
#else
if (enable)
return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
else
return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
#endif
}
#endif /* CONFIG_NETWORK */
#if CONFIG_FFSERVER
#if !HAVE_POLL_H
int poll(struct pollfd *fds, nfds_t numfds, int timeout)
{
fd_set read_set;
fd_set write_set;
fd_set exception_set;
nfds_t i;
int n;
int rc;
#if HAVE_WINSOCK2_H
if (numfds >= FD_SETSIZE) {
errno = EINVAL;
return -1;
}
#endif
FD_ZERO(&read_set);
FD_ZERO(&write_set);
FD_ZERO(&exception_set);
n = -1;
for(i = 0; i < numfds; i++) {
if (fds[i].fd < 0)
continue;
#if !HAVE_WINSOCK2_H
if (fds[i].fd >= FD_SETSIZE) {
errno = EINVAL;
return -1;
}
#endif
if (fds[i].events & POLLIN) FD_SET(fds[i].fd, &read_set);
if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);
if (fds[i].fd > n)
n = fds[i].fd;
};
if (n == -1)
/* Hey!? Nothing to poll, in fact!!! */
return 0;
if (timeout < 0)
rc = select(n+1, &read_set, &write_set, &exception_set, NULL);
else {
struct timeval tv;
tv.tv_sec = timeout / 1000;
tv.tv_usec = 1000 * (timeout % 1000);
rc = select(n+1, &read_set, &write_set, &exception_set, &tv);
};
if (rc < 0)
return rc;
for(i = 0; i < (nfds_t) n; i++) {
fds[i].revents = 0;
if (FD_ISSET(fds[i].fd, &read_set)) fds[i].revents |= POLLIN;
if (FD_ISSET(fds[i].fd, &write_set)) fds[i].revents |= POLLOUT;
if (FD_ISSET(fds[i].fd, &exception_set)) fds[i].revents |= POLLERR;
};
return rc;
}
#endif /* HAVE_POLL_H */
#endif /* CONFIG_FFSERVER */
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