2 * This file is part of DisOrder.
3 * Copyright (C) 2007 Richard Kettlewell
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * @brief Network interface support
27 #include <sys/ioctl.h>
29 #include <netinet/in.h>
37 /** @brief Get the list of network interfaces
38 * @param fd File descriptor to use
39 * @param interfaces Where to put pointer to array of interfaces
40 * @param ninterfaces Where to put count of interfaces
42 void ifreq_list(int fd, struct ifreq **interfaces, int *ninterfaces) {
49 l = ifc.ifc_len = ifc.ifc_len ? 2 * ifc.ifc_len
50 : 16 * (int)sizeof (struct ifreq);
51 if(!l) fatal(0, "out of memory");
52 ifc.ifc_req = xrealloc(ifc.ifc_req, l);
53 if(ioctl(fd, SIOCGIFCONF, &ifc) < 0)
54 fatal(errno, "error calling ioctl SIOCGIFCONF");
55 } while(l == ifc.ifc_len);
56 *ninterfaces = ifc.ifc_len / sizeof (struct ifreq);
57 *interfaces = ifc.ifc_req;
60 /** @brief Return true if two socket addresses match */
61 int sockaddr_equal(const struct sockaddr *a, const struct sockaddr *b) {
62 if(a->sa_family != b->sa_family)
64 switch(a->sa_family) {
66 return ((const struct sockaddr_in *)a)->sin_addr.s_addr
67 == ((const struct sockaddr_in *)b)->sin_addr.s_addr;
69 return !memcmp(&((const struct sockaddr_in6 *)a)->sin6_addr,
70 &((const struct sockaddr_in6 *)b)->sin6_addr,
71 sizeof (struct in6_addr));
73 fatal(0, "unknown address family %d", a->sa_family);