chiark / gitweb /
partial tests for kvp.c
[disorder] / lib / ifreq.c
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1/*
2 * This file is part of DisOrder.
3 * Copyright (C) 2007 Richard Kettlewell
4 *
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.
9 *
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.
14 *
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
18 * USA
19 */
717ba987 20/** @file lib/ifreq.c
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21 * @brief Network interface support
22 */
23
24#include <config.h>
25#include "types.h"
26
d76cf88c 27#include <sys/socket.h>
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28#include <sys/ioctl.h>
29#include <net/if.h>
30#include <netinet/in.h>
31#include <errno.h>
32#include <string.h>
33
34#include "ifreq.h"
35#include "mem.h"
36#include "log.h"
37
38/** @brief Get the list of network interfaces
39 * @param fd File descriptor to use
40 * @param interfaces Where to put pointer to array of interfaces
41 * @param ninterfaces Where to put count of interfaces
42 */
43void ifreq_list(int fd, struct ifreq **interfaces, int *ninterfaces) {
44 struct ifconf ifc;
45 int l;
46
47 ifc.ifc_len = 0;
48 ifc.ifc_req = 0;
49 do {
50 l = ifc.ifc_len = ifc.ifc_len ? 2 * ifc.ifc_len
51 : 16 * (int)sizeof (struct ifreq);
52 if(!l) fatal(0, "out of memory");
53 ifc.ifc_req = xrealloc(ifc.ifc_req, l);
54 if(ioctl(fd, SIOCGIFCONF, &ifc) < 0)
55 fatal(errno, "error calling ioctl SIOCGIFCONF");
56 } while(l == ifc.ifc_len);
57 *ninterfaces = ifc.ifc_len / sizeof (struct ifreq);
58 *interfaces = ifc.ifc_req;
59}
60
61/** @brief Return true if two socket addresses match */
62int sockaddr_equal(const struct sockaddr *a, const struct sockaddr *b) {
63 if(a->sa_family != b->sa_family)
64 return 0;
65 switch(a->sa_family) {
66 case AF_INET:
67 return ((const struct sockaddr_in *)a)->sin_addr.s_addr
68 == ((const struct sockaddr_in *)b)->sin_addr.s_addr;
69 case AF_INET6:
70 return !memcmp(&((const struct sockaddr_in6 *)a)->sin6_addr,
71 &((const struct sockaddr_in6 *)b)->sin6_addr,
72 sizeof (struct in6_addr));
73 default:
74 fatal(0, "unknown address family %d", a->sa_family);
75 }
76}
77
78/*
79Local Variables:
80c-basic-offset:2
81comment-column:40
82fill-column:79
83indent-tabs-mode:nil
84End:
85*/