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/*
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* rtmon.c RTnetlink listener.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <string.h>
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#include "version.h"
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#include "utils.h"
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#include "libnetlink.h"
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static int init_phase = 1;
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static void write_stamp(FILE *fp)
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{
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char buf[128];
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struct nlmsghdr *n1 = (void *)buf;
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struct timeval tv;
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n1->nlmsg_type = NLMSG_TSTAMP;
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n1->nlmsg_flags = 0;
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n1->nlmsg_seq = 0;
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n1->nlmsg_pid = 0;
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n1->nlmsg_len = NLMSG_LENGTH(4*2);
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gettimeofday(&tv, NULL);
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((__u32 *)NLMSG_DATA(n1))[0] = tv.tv_sec;
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((__u32 *)NLMSG_DATA(n1))[1] = tv.tv_usec;
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fwrite((void *)n1, 1, NLMSG_ALIGN(n1->nlmsg_len), fp);
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}
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static int dump_msg(struct rtnl_ctrl_data *ctrl,
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struct nlmsghdr *n, void *arg)
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{
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FILE *fp = (FILE *)arg;
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if (!init_phase)
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write_stamp(fp);
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fwrite((void *)n, 1, NLMSG_ALIGN(n->nlmsg_len), fp);
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fflush(fp);
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return 0;
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}
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static int dump_msg2(struct nlmsghdr *n, void *arg)
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{
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return dump_msg(NULL, n, arg);
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}
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: rtmon [ OPTIONS ] file FILE [ all | LISTofOBJECTS ]\n"
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"OPTIONS := { -f[amily] { inet | inet6 | link | help } |\n"
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" -4 | -6 | -0 | -V[ersion] }\n"
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"LISTofOBJECTS := [ link ] [ address ] [ route ]\n");
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exit(-1);
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}
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int
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main(int argc, char **argv)
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{
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FILE *fp;
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struct rtnl_handle rth;
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int family = AF_UNSPEC;
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unsigned int groups = ~0U;
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int llink = 0;
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int laddr = 0;
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int lroute = 0;
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char *file = NULL;
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while (argc > 1) {
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if (matches(argv[1], "-family") == 0) {
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argc--;
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argv++;
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if (argc <= 1)
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usage();
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if (strcmp(argv[1], "inet") == 0)
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family = AF_INET;
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else if (strcmp(argv[1], "inet6") == 0)
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family = AF_INET6;
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else if (strcmp(argv[1], "link") == 0)
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family = AF_INET6;
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else if (strcmp(argv[1], "help") == 0)
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usage();
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else {
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fprintf(stderr, "Protocol ID \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
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exit(-1);
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}
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} else if (strcmp(argv[1], "-4") == 0) {
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family = AF_INET;
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} else if (strcmp(argv[1], "-6") == 0) {
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family = AF_INET6;
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} else if (strcmp(argv[1], "-0") == 0) {
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family = AF_PACKET;
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} else if (matches(argv[1], "-Version") == 0) {
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printf("rtmon utility, iproute2-%s\n", version);
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exit(0);
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} else if (matches(argv[1], "file") == 0) {
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argc--;
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argv++;
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if (argc <= 1)
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usage();
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file = argv[1];
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} else if (matches(argv[1], "link") == 0) {
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llink = 1;
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groups = 0;
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} else if (matches(argv[1], "address") == 0) {
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laddr = 1;
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groups = 0;
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} else if (matches(argv[1], "route") == 0) {
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lroute = 1;
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groups = 0;
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} else if (strcmp(argv[1], "all") == 0) {
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groups = ~0U;
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} else if (matches(argv[1], "help") == 0) {
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usage();
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} else {
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fprintf(stderr, "Argument \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
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exit(-1);
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}
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argc--; argv++;
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}
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if (file == NULL) {
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fprintf(stderr, "Not enough information: argument \"file\" is required\n");
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exit(-1);
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}
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if (llink)
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groups |= nl_mgrp(RTNLGRP_LINK);
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if (laddr) {
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if (!family || family == AF_INET)
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groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
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if (!family || family == AF_INET6)
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groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
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}
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if (lroute) {
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if (!family || family == AF_INET)
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groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
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if (!family || family == AF_INET6)
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groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
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}
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fp = fopen(file, "w");
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if (fp == NULL) {
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perror("Cannot fopen");
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exit(-1);
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}
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if (rtnl_open(&rth, groups) < 0)
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exit(1);
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if (rtnl_linkdump_req(&rth, AF_UNSPEC) < 0) {
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perror("Cannot send dump request");
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exit(1);
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}
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write_stamp(fp);
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if (rtnl_dump_filter(&rth, dump_msg2, fp) < 0) {
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fprintf(stderr, "Dump terminated\n");
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return 1;
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}
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init_phase = 0;
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if (rtnl_listen(&rth, dump_msg, (void *)fp) < 0)
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exit(2);
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exit(0);
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}
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