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/*
* rtmon.c RTnetlink listener.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/if.h>
#include <string.h>
#include "libnetlink.h"
static int init_phase = 1;
static int dump_msg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE*)arg;
if (!init_phase) {
char buf[128];
struct nlmsghdr *n1 = (void*)buf;
struct timeval tv;
n1->nlmsg_type = 15;
n1->nlmsg_flags = 0;
n1->nlmsg_seq = 0;
n1->nlmsg_pid = 0;
n1->nlmsg_len = NLMSG_LENGTH(4*2);
gettimeofday(&tv, NULL);
((__u32*)NLMSG_DATA(n1))[0] = tv.tv_sec;
((__u32*)NLMSG_DATA(n1))[1] = tv.tv_usec;
fwrite((void*)n1, 1, NLMSG_ALIGN(n1->nlmsg_len), fp);
}
fwrite((void*)n, 1, NLMSG_ALIGN(n->nlmsg_len), fp);
fflush(fp);
return 0;
}
int
main(int argc, char **argv)
{
FILE *fp;
struct rtnl_handle rth;
if (argc != 2) {
fprintf(stderr, "Usage: rtmon <file>\n");
exit(-1);
}
fp = fopen(argv[1], "w");
if (fp == NULL) {
perror("fopen");
exit(-1);
}
if (rtnl_open(&rth, ~0U) < 0) {
fprintf(stderr, "cannot open rtnetlink\n");
exit(1);
}
if (rtnl_wilddump_request(&rth, AF_UNSPEC, RTM_GETLINK) < 0) {
perror("cannot send dump request");
exit(1);
}
init_phase = 0;
if (rtnl_listen(&rth, dump_msg, (void*)fp) < 0)
exit(2);
exit(0);
}
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