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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 |
81b1bf12 RK |
21 | * @brief Network interface support |
22 | */ | |
23 | ||
24 | #include <config.h> | |
25 | #include "types.h" | |
26 | ||
d76cf88c | 27 | #include <sys/socket.h> |
81b1bf12 RK |
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 | */ | |
43 | void 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 */ | |
62 | int 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 | /* | |
79 | Local Variables: | |
80 | c-basic-offset:2 | |
81 | comment-column:40 | |
82 | fill-column:79 | |
83 | indent-tabs-mode:nil | |
84 | End: | |
85 | */ |