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/*
* Copyright (C) 2013-2014 Red Hat, Inc.
*
* This library 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.
*
* This library 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 this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#if WITH_DLFCN_H
# include <dlfcn.h>
#endif
#if defined(__linux__) && defined(RTLD_NEXT)
# include "virsocket.h"
# include <unistd.h>
static bool host_has_ipv6;
static int (*realsocket)(int domain, int type, int protocol);
static void init_syms(void)
{
int fd;
if (realsocket)
return;
realsocket = dlsym(RTLD_NEXT, "socket");
if (!realsocket) {
fprintf(stderr, "Unable to find 'socket' symbol\n");
abort();
}
fd = realsocket(AF_INET6, SOCK_STREAM, 0);
if (fd < 0)
return;
host_has_ipv6 = true;
close(fd);
}
int socket(int domain,
int type,
int protocol)
{
init_syms();
if (getenv("LIBVIRT_TEST_IPV4ONLY") && domain == AF_INET6) {
errno = EAFNOSUPPORT;
return -1;
}
return realsocket(domain, type, protocol);
}
int bind(int sockfd G_GNUC_UNUSED,
const struct sockaddr *addr,
socklen_t addrlen G_GNUC_UNUSED)
{
struct sockaddr_in saddr;
memcpy(&saddr, addr, sizeof(saddr));
if (host_has_ipv6 && !getenv("LIBVIRT_TEST_IPV4ONLY")) {
if (saddr.sin_port == htons(5900) ||
(saddr.sin_family == AF_INET &&
saddr.sin_port == htons(5904)) ||
(saddr.sin_family == AF_INET6 &&
(saddr.sin_port == htons(5905) ||
saddr.sin_port == htons(5906)))) {
errno = EADDRINUSE;
return -1;
}
return 0;
}
if (saddr.sin_port == htons(5900) ||
saddr.sin_port == htons(5904) ||
saddr.sin_port == htons(5905) ||
saddr.sin_port == htons(5906)) {
errno = EADDRINUSE;
return -1;
}
return 0;
}
#else /* defined(__linux__) && defined(RTLD_NEXT) */
/* Nothing to override on other platforms. */
#endif
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