| 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 | */ |
| 20 | /** @file lib/ifreq.c |
| 21 | * @brief Network interface support |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include "types.h" |
| 26 | |
| 27 | #include <sys/socket.h> |
| 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 | */ |