| 1 | /* $Id: ifmonitor.c,v 1.1.1.1 2004-04-09 20:08:58 amb Exp $ */ |
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| 2 | |
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| 3 | /* |
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| 4 | * This file is part of ifplugd. |
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| 5 | * |
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| 6 | * ifplugd is free software; you can redistribute it and/or modify it |
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| 7 | * under the terms of the GNU General Public License as published by |
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| 8 | * the Free Software Foundation; either version 2 of the License, or |
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| 9 | * (at your option) any later version. |
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| 10 | * |
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| 11 | * ifplugd is distributed in the hope that it will be useful, but |
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| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU General Public License |
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| 17 | * along with ifplugd; if not, write to the Free Software Foundation, |
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| 18 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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| 19 | */ |
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| 20 | |
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| 21 | #include <stdio.h> |
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| 22 | #include <sys/socket.h> |
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| 23 | #include <linux/types.h> |
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| 24 | #include <linux/netlink.h> |
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| 25 | #include <linux/rtnetlink.h> |
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| 26 | #include <linux/if.h> |
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| 27 | #include <string.h> |
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| 28 | #include <unistd.h> |
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| 29 | #include <errno.h> |
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| 30 | |
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| 31 | #include <libdaemon/dlog.h> |
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| 32 | |
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| 33 | #include "nlapi.h" |
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| 34 | |
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| 35 | static int callback(struct nlmsghdr *n, void *u) { |
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| 36 | int (*cb)(int b, int index, unsigned short type, const char *name) = u; |
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| 37 | |
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| 38 | if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) { |
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| 39 | struct rtattr *a; |
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| 40 | struct ifinfomsg *i; |
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| 41 | char ifname[IFNAMSIZ+1]; |
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| 42 | int la; |
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| 43 | |
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| 44 | i = NLMSG_DATA(n); |
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| 45 | |
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| 46 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg))) { |
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| 47 | daemon_log(LOG_ERR, "NETLINK: Packet too small or truncated! (2)\n"); |
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| 48 | return -1; |
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| 49 | } |
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| 50 | |
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| 51 | memset(&ifname, 0, sizeof(ifname)); |
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| 52 | |
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| 53 | a = (void*) i + NLMSG_ALIGN(sizeof(struct ifinfomsg)); |
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| 54 | la = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg)); |
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| 55 | |
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| 56 | while (RTA_OK(a, la)) { |
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| 57 | |
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| 58 | if(a->rta_type == IFLA_IFNAME) { |
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| 59 | int l = RTA_PAYLOAD(a); |
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| 60 | if (l > IFNAMSIZ) |
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| 61 | l = IFNAMSIZ; |
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| 62 | strncpy(ifname, RTA_DATA(a), l); |
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| 63 | } |
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| 64 | |
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| 65 | a = RTA_NEXT(a, la); |
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| 66 | } |
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| 67 | |
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| 68 | if (cb(n->nlmsg_type == RTM_NEWLINK, i->ifi_index, i->ifi_type, ifname[0] ? ifname : NULL) < 0) |
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| 69 | return -1; |
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| 70 | } |
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| 71 | |
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| 72 | |
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| 73 | return 0; |
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| 74 | } |
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| 75 | |
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| 76 | int ifmonitor_init(int (*cb) (int b, int index, unsigned short type, const char *name)) { |
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| 77 | return nlapi_register(callback, cb); |
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| 78 | } |
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