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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* rtmon.c RTnetlink listener.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <string.h>
#include "version.h"
#include "utils.h"
#include "libnetlink.h"
static int init_phase = 1;
static void write_stamp(FILE *fp)
{
char buf[128];
struct nlmsghdr *n1 = (void *)buf;
struct timeval tv;
n1->nlmsg_type = NLMSG_TSTAMP;
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);
}
static int dump_msg(struct rtnl_ctrl_data *ctrl,
struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE *)arg;
if (!init_phase)
write_stamp(fp);
fwrite((void *)n, 1, NLMSG_ALIGN(n->nlmsg_len), fp);
fflush(fp);
return 0;
}
static int dump_msg2(struct nlmsghdr *n, void *arg)
{
return dump_msg(NULL, n, arg);
}
static void usage(void)
{
fprintf(stderr,
"Usage: rtmon [ OPTIONS ] file FILE [ all | LISTofOBJECTS ]\n"
"OPTIONS := { -f[amily] { inet | inet6 | link | help } |\n"
" -4 | -6 | -0 | -V[ersion] }\n"
"LISTofOBJECTS := [ link ] [ address ] [ route ]\n");
exit(-1);
}
int
main(int argc, char **argv)
{
FILE *fp;
struct rtnl_handle rth;
int family = AF_UNSPEC;
unsigned int groups = ~0U;
int llink = 0;
int laddr = 0;
int lroute = 0;
char *file = NULL;
while (argc > 1) {
if (matches(argv[1], "-family") == 0) {
argc--;
argv++;
if (argc <= 1)
usage();
if (strcmp(argv[1], "inet") == 0)
family = AF_INET;
else if (strcmp(argv[1], "inet6") == 0)
family = AF_INET6;
else if (strcmp(argv[1], "link") == 0)
family = AF_INET6;
else if (strcmp(argv[1], "help") == 0)
usage();
else {
fprintf(stderr, "Protocol ID \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
exit(-1);
}
} else if (strcmp(argv[1], "-4") == 0) {
family = AF_INET;
} else if (strcmp(argv[1], "-6") == 0) {
family = AF_INET6;
} else if (strcmp(argv[1], "-0") == 0) {
family = AF_PACKET;
} else if (matches(argv[1], "-Version") == 0) {
printf("rtmon utility, iproute2-%s\n", version);
exit(0);
} else if (matches(argv[1], "file") == 0) {
argc--;
argv++;
if (argc <= 1)
usage();
file = argv[1];
} else if (matches(argv[1], "link") == 0) {
llink = 1;
groups = 0;
} else if (matches(argv[1], "address") == 0) {
laddr = 1;
groups = 0;
} else if (matches(argv[1], "route") == 0) {
lroute = 1;
groups = 0;
} else if (strcmp(argv[1], "all") == 0) {
groups = ~0U;
} else if (matches(argv[1], "help") == 0) {
usage();
} else {
fprintf(stderr, "Argument \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
exit(-1);
}
argc--; argv++;
}
if (file == NULL) {
fprintf(stderr, "Not enough information: argument \"file\" is required\n");
exit(-1);
}
if (llink)
groups |= nl_mgrp(RTNLGRP_LINK);
if (laddr) {
if (!family || family == AF_INET)
groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
if (!family || family == AF_INET6)
groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
}
if (lroute) {
if (!family || family == AF_INET)
groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
if (!family || family == AF_INET6)
groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
}
fp = fopen(file, "w");
if (fp == NULL) {
perror("Cannot fopen");
exit(-1);
}
if (rtnl_open(&rth, groups) < 0)
exit(1);
if (rtnl_linkdump_req(&rth, AF_UNSPEC) < 0) {
perror("Cannot send dump request");
exit(1);
}
write_stamp(fp);
if (rtnl_dump_filter(&rth, dump_msg2, fp) < 0) {
fprintf(stderr, "Dump terminated\n");
return 1;
}
init_phase = 0;
if (rtnl_listen(&rth, dump_msg, (void *)fp) < 0)
exit(2);
exit(0);
}
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