ip/ipmonitor.c - pub/scm/network/iproute2/iproute2 - Git at Google

 /*
  * 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 <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"
 #include "nh_common.h"

 static void usage(void) __attribute__((noreturn));
 static int prefix_banner;
 int listen_all_nsid;

 static void usage(void)
 {
 	fprintf(stderr,
 		"Usage: ip monitor [ all | OBJECTS ] [ FILE ] [ label ] [ all-nsid ]\n"
 		"                  [ dev DEVICE ]\n"
 		"OBJECTS :=  address | link | mroute | neigh | netconf |\n"
 		"            nexthop | nsid | prefix | route | rule\n"
 		"FILE := file FILENAME\n");
 	exit(-1);
 }

 static void print_headers(FILE *fp, char *label, struct rtnl_ctrl_data *ctrl)
 {
 	if (timestamp)
 		print_timestamp(fp);

 	if (listen_all_nsid) {
 		if (ctrl == NULL || ctrl->nsid < 0)
 			fprintf(fp, "[nsid current]");
 		else
 			fprintf(fp, "[nsid %d]", ctrl->nsid);
 	}

 	if (prefix_banner)
 		fprintf(fp, "%s", label);
 }

 static int accept_msg(struct rtnl_ctrl_data *ctrl,
 		      struct nlmsghdr *n, void *arg)
 {
 	FILE *fp = (FILE *)arg;

 	switch (n->nlmsg_type) {
 	case RTM_NEWROUTE:
 	case RTM_DELROUTE: {
 		struct rtmsg *r = NLMSG_DATA(n);
 		int len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*r));

 		if (len < 0) {
 			fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 			return -1;
 		}

 		if (r->rtm_flags & RTM_F_CLONED)
 			return 0;

 		if (r->rtm_family == RTNL_FAMILY_IPMR ||
 		    r->rtm_family == RTNL_FAMILY_IP6MR) {
 			print_headers(fp, "[MROUTE]", ctrl);
 			print_mroute(n, arg);
 			return 0;
 		} else {
 			print_headers(fp, "[ROUTE]", ctrl);
 			print_route(n, arg);
 			return 0;
 		}
 	}

 	case RTM_NEWNEXTHOP:
 	case RTM_DELNEXTHOP:
 		print_headers(fp, "[NEXTHOP]", ctrl);
 		print_cache_nexthop(n, arg, true);
 		return 0;

 	case RTM_NEWNEXTHOPBUCKET:
 	case RTM_DELNEXTHOPBUCKET:
 		print_headers(fp, "[NEXTHOPBUCKET]", ctrl);
 		print_nexthop_bucket(n, arg);
 		return 0;

 	case RTM_NEWLINK:
 	case RTM_DELLINK:
 		ll_remember_index(n, NULL);
 		print_headers(fp, "[LINK]", ctrl);
 		print_linkinfo(n, arg);
 		return 0;

 	case RTM_NEWADDR:
 	case RTM_DELADDR:
 		print_headers(fp, "[ADDR]", ctrl);
 		print_addrinfo(n, arg);
 		return 0;

 	case RTM_NEWADDRLABEL:
 	case RTM_DELADDRLABEL:
 		print_headers(fp, "[ADDRLABEL]", ctrl);
 		print_addrlabel(n, arg);
 		return 0;

 	case RTM_NEWNEIGH:
 	case RTM_DELNEIGH:
 	case RTM_GETNEIGH:
 		if (preferred_family) {
 			struct ndmsg *r = NLMSG_DATA(n);

 			if (r->ndm_family != preferred_family)
 				return 0;
 		}

 		print_headers(fp, "[NEIGH]", ctrl);
 		print_neigh(n, arg);
 		return 0;

 	case RTM_NEWPREFIX:
 		print_headers(fp, "[PREFIX]", ctrl);
 		print_prefix(n, arg);
 		return 0;

 	case RTM_NEWRULE:
 	case RTM_DELRULE:
 		print_headers(fp, "[RULE]", ctrl);
 		print_rule(n, arg);
 		return 0;

 	case NLMSG_TSTAMP:
 		print_nlmsg_timestamp(fp, n);
 		return 0;

 	case RTM_NEWNETCONF:
 	case RTM_DELNETCONF:
 		print_headers(fp, "[NETCONF]", ctrl);
 		print_netconf(ctrl, n, arg);
 		return 0;

 	case RTM_DELNSID:
 	case RTM_NEWNSID:
 		print_headers(fp, "[NSID]", ctrl);
 		print_nsid(n, arg);
 		return 0;

 	case NLMSG_ERROR:
 	case NLMSG_NOOP:
 	case NLMSG_DONE:
 		break;	/* ignore */

 	default:
 		fprintf(stderr,
 			"Unknown message: type=0x%08x(%d) flags=0x%08x(%d) len=0x%08x(%d)\n",
 			n->nlmsg_type, n->nlmsg_type,
 			n->nlmsg_flags, n->nlmsg_flags, n->nlmsg_len,
 			n->nlmsg_len);
 	}
 	return 0;
 }

 int do_ipmonitor(int argc, char **argv)
 {
 	int lnexthop = 0, nh_set = 1;
 	char *file = NULL;
 	unsigned int groups = 0;
 	int llink = 0;
 	int laddr = 0;
 	int lroute = 0;
 	int lmroute = 0;
 	int lprefix = 0;
 	int lneigh = 0;
 	int lnetconf = 0;
 	int lrule = 0;
 	int lnsid = 0;
 	int ifindex = 0;

 	groups |= nl_mgrp(RTNLGRP_LINK);
 	groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 	groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 	groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 	groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 	groups |= nl_mgrp(RTNLGRP_MPLS_ROUTE);
 	groups |= nl_mgrp(RTNLGRP_IPV4_MROUTE);
 	groups |= nl_mgrp(RTNLGRP_IPV6_MROUTE);
 	groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 	groups |= nl_mgrp(RTNLGRP_NEIGH);
 	groups |= nl_mgrp(RTNLGRP_IPV4_NETCONF);
 	groups |= nl_mgrp(RTNLGRP_IPV6_NETCONF);
 	groups |= nl_mgrp(RTNLGRP_IPV4_RULE);
 	groups |= nl_mgrp(RTNLGRP_IPV6_RULE);
 	groups |= nl_mgrp(RTNLGRP_NSID);
 	groups |= nl_mgrp(RTNLGRP_MPLS_NETCONF);

 	rtnl_close(&rth);

 	while (argc > 0) {
 		if (matches(*argv, "file") == 0) {
 			NEXT_ARG();
 			file = *argv;
 		} else if (matches(*argv, "label") == 0) {
 			prefix_banner = 1;
 		} else if (matches(*argv, "link") == 0) {
 			llink = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "address") == 0) {
 			laddr = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "route") == 0) {
 			lroute = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "mroute") == 0) {
 			lmroute = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "prefix") == 0) {
 			lprefix = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "neigh") == 0) {
 			lneigh = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "netconf") == 0) {
 			lnetconf = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "rule") == 0) {
 			lrule = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "nsid") == 0) {
 			lnsid = 1;
 			groups = 0;
 			nh_set = 0;
 		} else if (matches(*argv, "nexthop") == 0) {
 			lnexthop = 1;
 			groups = 0;
 		} else if (strcmp(*argv, "all") == 0) {
 			prefix_banner = 1;
 		} else if (matches(*argv, "all-nsid") == 0) {
 			listen_all_nsid = 1;
 		} else if (matches(*argv, "help") == 0) {
 			usage();
 		} else if (strcmp(*argv, "dev") == 0) {
 			NEXT_ARG();

 			ifindex = ll_name_to_index(*argv);
 			if (!ifindex)
 				invarg("Device does not exist\n", *argv);
 		} else {
 			fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 			exit(-1);
 		}
 		argc--;	argv++;
 	}

 	ipaddr_reset_filter(1, ifindex);
 	iproute_reset_filter(ifindex);
 	ipmroute_reset_filter(ifindex);
 	ipneigh_reset_filter(ifindex);
 	ipnetconf_reset_filter(ifindex);

 	if (llink)
 		groups |= nl_mgrp(RTNLGRP_LINK);
 	if (laddr) {
 		if (!preferred_family || preferred_family == AF_INET)
 			groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 		if (!preferred_family || preferred_family == AF_INET6)
 			groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 	}
 	if (lroute) {
 		if (!preferred_family || preferred_family == AF_INET)
 			groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 		if (!preferred_family || preferred_family == AF_INET6)
 			groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 		if (!preferred_family || preferred_family == AF_MPLS)
 			groups |= nl_mgrp(RTNLGRP_MPLS_ROUTE);
 	}
 	if (lmroute) {
 		if (!preferred_family || preferred_family == AF_INET)
 			groups |= nl_mgrp(RTNLGRP_IPV4_MROUTE);
 		if (!preferred_family || preferred_family == AF_INET6)
 			groups |= nl_mgrp(RTNLGRP_IPV6_MROUTE);
 	}
 	if (lprefix) {
 		if (!preferred_family || preferred_family == AF_INET6)
 			groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 	}
 	if (lneigh) {
 		groups |= nl_mgrp(RTNLGRP_NEIGH);
 	}
 	if (lnetconf) {
 		if (!preferred_family || preferred_family == AF_INET)
 			groups |= nl_mgrp(RTNLGRP_IPV4_NETCONF);
 		if (!preferred_family || preferred_family == AF_INET6)
 			groups |= nl_mgrp(RTNLGRP_IPV6_NETCONF);
 		if (!preferred_family || preferred_family == AF_MPLS)
 			groups |= nl_mgrp(RTNLGRP_MPLS_NETCONF);
 	}
 	if (lrule) {
 		if (!preferred_family || preferred_family == AF_INET)
 			groups |= nl_mgrp(RTNLGRP_IPV4_RULE);
 		if (!preferred_family || preferred_family == AF_INET6)
 			groups |= nl_mgrp(RTNLGRP_IPV6_RULE);
 	}
 	if (lnsid) {
 		groups |= nl_mgrp(RTNLGRP_NSID);
 	}
 	if (nh_set)
 		lnexthop = 1;

 	if (file) {
 		FILE *fp;
 		int err;

 		fp = fopen(file, "r");
 		if (fp == NULL) {
 			perror("Cannot fopen");
 			exit(-1);
 		}
 		err = rtnl_from_file(fp, accept_msg, stdout);
 		fclose(fp);
 		return err;
 	}

 	if (rtnl_open(&rth, groups) < 0)
 		exit(1);

 	if (lnexthop && rtnl_add_nl_group(&rth, RTNLGRP_NEXTHOP) < 0) {
 		fprintf(stderr, "Failed to add nexthop group to list\n");
 		exit(1);
 	}

 	if (listen_all_nsid && rtnl_listen_all_nsid(&rth) < 0)
 		exit(1);

 	ll_init_map(&rth);
 	netns_nsid_socket_init();
 	netns_map_init();

 	if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 		exit(2);

 	return 0;
 }
	/*
	* 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 <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"
	#include "nh_common.h"

	static void usage(void) __attribute__((noreturn));
	static int prefix_banner;
	int listen_all_nsid;

	static void usage(void)
	{
	fprintf(stderr,
	"Usage: ip monitor [ all \| OBJECTS ] [ FILE ] [ label ] [ all-nsid ]\n"
	" [ dev DEVICE ]\n"
	"OBJECTS := address \| link \| mroute \| neigh \| netconf \|\n"
	" nexthop \| nsid \| prefix \| route \| rule\n"
	"FILE := file FILENAME\n");
	exit(-1);
	}

	static void print_headers(FILE fp, char label, struct rtnl_ctrl_data *ctrl)
	{
	if (timestamp)
	print_timestamp(fp);

	if (listen_all_nsid) {
	if (ctrl == NULL \|\| ctrl->nsid < 0)
	fprintf(fp, "[nsid current]");
	else
	fprintf(fp, "[nsid %d]", ctrl->nsid);
	}

	if (prefix_banner)
	fprintf(fp, "%s", label);
	}

	static int accept_msg(struct rtnl_ctrl_data *ctrl,
	struct nlmsghdr n, void arg)
	{
	FILE fp = (FILE )arg;

	switch (n->nlmsg_type) {
	case RTM_NEWROUTE:
	case RTM_DELROUTE: {
	struct rtmsg *r = NLMSG_DATA(n);
	int len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*r));

	if (len < 0) {
	fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
	return -1;
	}

	if (r->rtm_flags & RTM_F_CLONED)
	return 0;

	if (r->rtm_family == RTNL_FAMILY_IPMR \|\|
	r->rtm_family == RTNL_FAMILY_IP6MR) {
	print_headers(fp, "[MROUTE]", ctrl);
	print_mroute(n, arg);
	return 0;
	} else {
	print_headers(fp, "[ROUTE]", ctrl);
	print_route(n, arg);
	return 0;
	}
	}

	case RTM_NEWNEXTHOP:
	case RTM_DELNEXTHOP:
	print_headers(fp, "[NEXTHOP]", ctrl);
	print_cache_nexthop(n, arg, true);
	return 0;

	case RTM_NEWNEXTHOPBUCKET:
	case RTM_DELNEXTHOPBUCKET:
	print_headers(fp, "[NEXTHOPBUCKET]", ctrl);
	print_nexthop_bucket(n, arg);
	return 0;

	case RTM_NEWLINK:
	case RTM_DELLINK:
	ll_remember_index(n, NULL);
	print_headers(fp, "[LINK]", ctrl);
	print_linkinfo(n, arg);
	return 0;

	case RTM_NEWADDR:
	case RTM_DELADDR:
	print_headers(fp, "[ADDR]", ctrl);
	print_addrinfo(n, arg);
	return 0;

	case RTM_NEWADDRLABEL:
	case RTM_DELADDRLABEL:
	print_headers(fp, "[ADDRLABEL]", ctrl);
	print_addrlabel(n, arg);
	return 0;

	case RTM_NEWNEIGH:
	case RTM_DELNEIGH:
	case RTM_GETNEIGH:
	if (preferred_family) {
	struct ndmsg *r = NLMSG_DATA(n);

	if (r->ndm_family != preferred_family)
	return 0;
	}

	print_headers(fp, "[NEIGH]", ctrl);
	print_neigh(n, arg);
	return 0;

	case RTM_NEWPREFIX:
	print_headers(fp, "[PREFIX]", ctrl);
	print_prefix(n, arg);
	return 0;

	case RTM_NEWRULE:
	case RTM_DELRULE:
	print_headers(fp, "[RULE]", ctrl);
	print_rule(n, arg);
	return 0;

	case NLMSG_TSTAMP:
	print_nlmsg_timestamp(fp, n);
	return 0;

	case RTM_NEWNETCONF:
	case RTM_DELNETCONF:
	print_headers(fp, "[NETCONF]", ctrl);
	print_netconf(ctrl, n, arg);
	return 0;

	case RTM_DELNSID:
	case RTM_NEWNSID:
	print_headers(fp, "[NSID]", ctrl);
	print_nsid(n, arg);
	return 0;

	case NLMSG_ERROR:
	case NLMSG_NOOP:
	case NLMSG_DONE:
	break; /* ignore */

	default:
	fprintf(stderr,
	"Unknown message: type=0x%08x(%d) flags=0x%08x(%d) len=0x%08x(%d)\n",
	n->nlmsg_type, n->nlmsg_type,
	n->nlmsg_flags, n->nlmsg_flags, n->nlmsg_len,
	n->nlmsg_len);
	}
	return 0;
	}

	int do_ipmonitor(int argc, char **argv)
	{
	int lnexthop = 0, nh_set = 1;
	char *file = NULL;
	unsigned int groups = 0;
	int llink = 0;
	int laddr = 0;
	int lroute = 0;
	int lmroute = 0;
	int lprefix = 0;
	int lneigh = 0;
	int lnetconf = 0;
	int lrule = 0;
	int lnsid = 0;
	int ifindex = 0;

	groups \|= nl_mgrp(RTNLGRP_LINK);
	groups \|= nl_mgrp(RTNLGRP_IPV4_IFADDR);
	groups \|= nl_mgrp(RTNLGRP_IPV6_IFADDR);
	groups \|= nl_mgrp(RTNLGRP_IPV4_ROUTE);
	groups \|= nl_mgrp(RTNLGRP_IPV6_ROUTE);
	groups \|= nl_mgrp(RTNLGRP_MPLS_ROUTE);
	groups \|= nl_mgrp(RTNLGRP_IPV4_MROUTE);
	groups \|= nl_mgrp(RTNLGRP_IPV6_MROUTE);
	groups \|= nl_mgrp(RTNLGRP_IPV6_PREFIX);
	groups \|= nl_mgrp(RTNLGRP_NEIGH);
	groups \|= nl_mgrp(RTNLGRP_IPV4_NETCONF);
	groups \|= nl_mgrp(RTNLGRP_IPV6_NETCONF);
	groups \|= nl_mgrp(RTNLGRP_IPV4_RULE);
	groups \|= nl_mgrp(RTNLGRP_IPV6_RULE);
	groups \|= nl_mgrp(RTNLGRP_NSID);
	groups \|= nl_mgrp(RTNLGRP_MPLS_NETCONF);

	rtnl_close(&rth);

	while (argc > 0) {
	if (matches(*argv, "file") == 0) {
	NEXT_ARG();
	file = *argv;
	} else if (matches(*argv, "label") == 0) {
	prefix_banner = 1;
	} else if (matches(*argv, "link") == 0) {
	llink = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "address") == 0) {
	laddr = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "route") == 0) {
	lroute = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "mroute") == 0) {
	lmroute = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "prefix") == 0) {
	lprefix = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "neigh") == 0) {
	lneigh = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "netconf") == 0) {
	lnetconf = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "rule") == 0) {
	lrule = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "nsid") == 0) {
	lnsid = 1;
	groups = 0;
	nh_set = 0;
	} else if (matches(*argv, "nexthop") == 0) {
	lnexthop = 1;
	groups = 0;
	} else if (strcmp(*argv, "all") == 0) {
	prefix_banner = 1;
	} else if (matches(*argv, "all-nsid") == 0) {
	listen_all_nsid = 1;
	} else if (matches(*argv, "help") == 0) {
	usage();
	} else if (strcmp(*argv, "dev") == 0) {
	NEXT_ARG();

	ifindex = ll_name_to_index(*argv);
	if (!ifindex)
	invarg("Device does not exist\n", *argv);
	} else {
	fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
	exit(-1);
	}
	argc--; argv++;
	}

	ipaddr_reset_filter(1, ifindex);
	iproute_reset_filter(ifindex);
	ipmroute_reset_filter(ifindex);
	ipneigh_reset_filter(ifindex);
	ipnetconf_reset_filter(ifindex);

	if (llink)
	groups \|= nl_mgrp(RTNLGRP_LINK);
	if (laddr) {
	if (!preferred_family \|\| preferred_family == AF_INET)
	groups \|= nl_mgrp(RTNLGRP_IPV4_IFADDR);
	if (!preferred_family \|\| preferred_family == AF_INET6)
	groups \|= nl_mgrp(RTNLGRP_IPV6_IFADDR);
	}
	if (lroute) {
	if (!preferred_family \|\| preferred_family == AF_INET)
	groups \|= nl_mgrp(RTNLGRP_IPV4_ROUTE);
	if (!preferred_family \|\| preferred_family == AF_INET6)
	groups \|= nl_mgrp(RTNLGRP_IPV6_ROUTE);
	if (!preferred_family \|\| preferred_family == AF_MPLS)
	groups \|= nl_mgrp(RTNLGRP_MPLS_ROUTE);
	}
	if (lmroute) {
	if (!preferred_family \|\| preferred_family == AF_INET)
	groups \|= nl_mgrp(RTNLGRP_IPV4_MROUTE);
	if (!preferred_family \|\| preferred_family == AF_INET6)
	groups \|= nl_mgrp(RTNLGRP_IPV6_MROUTE);
	}
	if (lprefix) {
	if (!preferred_family \|\| preferred_family == AF_INET6)
	groups \|= nl_mgrp(RTNLGRP_IPV6_PREFIX);
	}
	if (lneigh) {
	groups \|= nl_mgrp(RTNLGRP_NEIGH);
	}
	if (lnetconf) {
	if (!preferred_family \|\| preferred_family == AF_INET)
	groups \|= nl_mgrp(RTNLGRP_IPV4_NETCONF);
	if (!preferred_family \|\| preferred_family == AF_INET6)
	groups \|= nl_mgrp(RTNLGRP_IPV6_NETCONF);
	if (!preferred_family \|\| preferred_family == AF_MPLS)
	groups \|= nl_mgrp(RTNLGRP_MPLS_NETCONF);
	}
	if (lrule) {
	if (!preferred_family \|\| preferred_family == AF_INET)
	groups \|= nl_mgrp(RTNLGRP_IPV4_RULE);
	if (!preferred_family \|\| preferred_family == AF_INET6)
	groups \|= nl_mgrp(RTNLGRP_IPV6_RULE);
	}
	if (lnsid) {
	groups \|= nl_mgrp(RTNLGRP_NSID);
	}
	if (nh_set)
	lnexthop = 1;

	if (file) {
	FILE *fp;
	int err;

	fp = fopen(file, "r");
	if (fp == NULL) {
	perror("Cannot fopen");
	exit(-1);
	}
	err = rtnl_from_file(fp, accept_msg, stdout);
	fclose(fp);
	return err;
	}

	if (rtnl_open(&rth, groups) < 0)
	exit(1);

	if (lnexthop && rtnl_add_nl_group(&rth, RTNLGRP_NEXTHOP) < 0) {
	fprintf(stderr, "Failed to add nexthop group to list\n");
	exit(1);
	}

	if (listen_all_nsid && rtnl_listen_all_nsid(&rth) < 0)
	exit(1);

	ll_init_map(&rth);
	netns_nsid_socket_init();
	netns_map_init();

	if (rtnl_listen(&rth, accept_msg, stdout) < 0)
	exit(2);

	return 0;
	}