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/*
* ipmonitor.c "ip monitor".
*
* 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 <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <time.h>
#include "utils.h"
#include "ip_common.h"
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip monitor [ all | LISTofOBJECTS ]\n");
exit(-1);
}
int accept_msg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE*)arg;
if (n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) {
print_route(who, n, arg);
return 0;
}
if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
ll_remember_index(who, n, NULL);
print_linkinfo(who, n, arg);
return 0;
}
if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
print_addrinfo(who, n, arg);
return 0;
}
if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH) {
print_neigh(who, n, arg);
return 0;
}
if (n->nlmsg_type == 15) {
char *tstr;
time_t secs = ((__u32*)NLMSG_DATA(n))[0];
long usecs = ((__u32*)NLMSG_DATA(n))[1];
tstr = asctime(localtime(&secs));
tstr[strlen(tstr)-1] = 0;
fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
return 0;
}
if (n->nlmsg_type == RTM_NEWQDISC ||
n->nlmsg_type == RTM_DELQDISC ||
n->nlmsg_type == RTM_NEWTCLASS ||
n->nlmsg_type == RTM_DELTCLASS ||
n->nlmsg_type == RTM_NEWTFILTER ||
n->nlmsg_type == RTM_DELTFILTER)
return 0;
if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
n->nlmsg_type != NLMSG_DONE) {
fprintf(fp, "Unknown message: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
}
return 0;
}
int do_ipmonitor(int argc, char **argv)
{
struct rtnl_handle rth;
char *file = NULL;
unsigned groups = ~RTMGRP_TC;
int llink=0;
int laddr=0;
int lroute=0;
ipaddr_reset_filter(1);
iproute_reset_filter();
ipneigh_reset_filter();
while (argc > 0) {
if (matches(*argv, "file") == 0) {
NEXT_ARG();
file = *argv;
} else if (matches(*argv, "link") == 0) {
llink=1;
groups = 0;
} else if (matches(*argv, "address") == 0) {
laddr=1;
groups = 0;
} else if (matches(*argv, "route") == 0) {
lroute=1;
groups = 0;
} else if (strcmp(*argv, "all") == 0) {
groups = ~RTMGRP_TC;
} else if (matches(*argv, "help") == 0) {
usage();
} else {
fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
exit(-1);
}
argc--; argv++;
}
if (llink)
groups |= RTMGRP_LINK;
if (laddr) {
if (!preferred_family || preferred_family == AF_INET)
groups |= RTMGRP_IPV4_IFADDR;
if (!preferred_family || preferred_family == AF_INET6)
groups |= RTMGRP_IPV6_IFADDR;
}
if (lroute) {
if (!preferred_family || preferred_family == AF_INET)
groups |= RTMGRP_IPV4_ROUTE;
if (!preferred_family || preferred_family == AF_INET6)
groups |= RTMGRP_IPV6_ROUTE;
}
if (file) {
FILE *fp;
fp = fopen(file, "r");
if (fp == NULL) {
perror("Cannot fopen");
exit(-1);
}
return rtnl_from_file(fp, accept_msg, (void*)stdout);
}
if (rtnl_open(&rth, groups) < 0)
exit(1);
ll_init_map(&rth);
if (rtnl_listen(&rth, print_route, (void*)stdout) < 0)
exit(2);
exit(0);
}
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