/* SPDX-License-Identifier: LGPL-2.1-only */

/*

 * src/nl-monitor.c     Monitor events

 *

 *	This library is free software; you can redistribute it and/or

 *	modify it under the terms of the GNU Lesser General Public

 *	License as published by the Free Software Foundation version 2.1

 *	of the License.

 *

 * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>

 */

#include <netlink/cli/utils.h>

#include <netlink/cli/link.h>

#include <linux/rtnetlink.h>

static const struct {

	enum rtnetlink_groups gr_id;

	const char* gr_name;

} known_groups[] = {

	{ RTNLGRP_LINK, "link" },

	{ RTNLGRP_NOTIFY, "notify" },

	{ RTNLGRP_NEIGH, "neigh" },

	{ RTNLGRP_TC, "tc" },

	{ RTNLGRP_IPV4_IFADDR, "ipv4-ifaddr" },

	{ RTNLGRP_IPV4_MROUTE, "ipv4-mroute" },

	{ RTNLGRP_IPV4_ROUTE, "ipv4-route" },

	{ RTNLGRP_IPV6_IFADDR, "ipv6-ifaddr" },

	{ RTNLGRP_IPV6_MROUTE, "ipv6-mroute" },

	{ RTNLGRP_IPV6_ROUTE, "ipv6-route" },

	{ RTNLGRP_IPV6_IFINFO, "ipv6-ifinfo" },

	{ RTNLGRP_DECnet_IFADDR, "decnet-ifaddr" },

	{ RTNLGRP_DECnet_ROUTE, "decnet-route" },

	{ RTNLGRP_IPV6_PREFIX, "ipv6-prefix" },

	{ RTNLGRP_IPV4_NETCONF, "ipv4-netconf" },

	{ RTNLGRP_IPV6_NETCONF, "ipv6-netconf" },

	{ RTNLGRP_MPLS_NETCONF, "mpls-netconf" },

	{ RTNLGRP_NONE, NULL }

};

static void obj_input(struct nl_object *obj, void *arg)

{

	nl_object_dump(obj, arg);

}

static int event_input(struct nl_msg *msg, void *arg)

{

	if (nl_msg_parse(msg, &obj_input, arg) < 0)

		fprintf(stderr, "<<EVENT>> Unknown message type\n");

	/* Exit nl_recvmsgs_def() and return to the main select() */

	return NL_STOP;

}

static void print_usage(void)

{

	int i;

        printf(

	"Usage: nl-monitor [OPTION] [<groups>]\n"

	"\n"

	"Options\n"

	" -f, --format=TYPE     Output format { brief | details | stats }\n"

	" -h, --help            Show this help.\n"

	"\n"

        );

	printf("Known groups:");

	for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++)

		printf(" %s", known_groups[i].gr_name);

	printf("\n");

        exit(0);

}

int main(int argc, char *argv[])

{

	struct nl_dump_params dp = {

		.dp_type = NL_DUMP_STATS,

		.dp_fd = stdout,

		.dp_dump_msgtype = 1,

	};

	struct nl_sock *sock;

	int err = 1;

	int i, idx;

	sock = nl_cli_alloc_socket();

	nl_socket_disable_seq_check(sock);

	nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, &dp;;

	for (;;) {

		int c, optidx = 0;

		static struct option long_opts[] = {

			{ "format", 1, 0, 'f' },

			{ 0, 0, 0, 0 }

		};

		c = getopt_long(argc, argv, "f:h", long_opts, &optidx);

		if (c == -1)

                        break;

                switch (c) {

                case 'f':

			dp.dp_type = nl_cli_parse_dumptype(optarg);

			break;

		default:

			print_usage();

			break;

		}

	}

	nl_cli_connect(sock, NETLINK_ROUTE);

	for (idx = optind; argc > idx; idx++) {

		for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++) {

			if (!strcmp(argv[idx], known_groups[i].gr_name)) {

				if ((err = nl_socket_add_membership(sock, known_groups[i].gr_id)) < 0) {

					nl_cli_fatal(err, "%s: %s\n", argv[idx],

						     nl_geterror(err));

				}

				break;

			}

		}

		if (known_groups[i].gr_id == RTNLGRP_NONE)

			fprintf(stderr, "Warning: Unknown group: %s\n", argv[idx]);

	}

	nl_cli_link_alloc_cache(sock);

	while (1) {

		fd_set rfds;

		int fd, retval;

		fd = nl_socket_get_fd(sock);

		FD_ZERO(&rfds);

		FD_SET(fd, &rfds);

		/* wait for an incoming message on the netlink socket */

		retval = select(fd+1, &rfds, NULL, NULL, NULL);

		if (retval) {

			/* FD_ISSET(fd, &rfds) will be true */

			nl_recvmsgs_default(sock);

		}

	}

	return 0;

}