1/*
2 * src/nl-monitor.c     Monitor events
3 *
4 *	This library is free software; you can redistribute it and/or
5 *	modify it under the terms of the GNU Lesser General Public
6 *	License as published by the Free Software Foundation version 2.1
7 *	of the License.
8 *
9 * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
10 */
11
12#include <netlink/cli/utils.h>
13#include <netlink/cli/link.h>
14
15static void obj_input(struct nl_object *obj, void *arg)
16{
17	struct nl_dump_params dp = {
18		.dp_type = NL_DUMP_STATS,
19		.dp_fd = stdout,
20		.dp_dump_msgtype = 1,
21	};
22
23	nl_object_dump(obj, &dp);
24}
25
26static int event_input(struct nl_msg *msg, void *arg)
27{
28	if (nl_msg_parse(msg, &obj_input, NULL) < 0)
29		fprintf(stderr, "<<EVENT>> Unknown message type\n");
30
31	/* Exit nl_recvmsgs_def() and return to the main select() */
32	return NL_STOP;
33}
34
35int main(int argc, char *argv[])
36{
37	struct nl_sock *sock;
38	struct nl_cache *link_cache;
39	int err = 1;
40	int i, idx;
41
42	static const struct {
43		enum rtnetlink_groups gr_id;
44		const char* gr_name;
45	} known_groups[] = {
46		{ RTNLGRP_LINK, "link" },
47		{ RTNLGRP_NOTIFY, "notify" },
48		{ RTNLGRP_NEIGH, "neigh" },
49		{ RTNLGRP_TC, "tc" },
50		{ RTNLGRP_IPV4_IFADDR, "ipv4-ifaddr" },
51		{ RTNLGRP_IPV4_MROUTE, "ipv4-mroute" },
52		{ RTNLGRP_IPV4_ROUTE, "ipv4-route" },
53		{ RTNLGRP_IPV6_IFADDR, "ipv6-ifaddr" },
54		{ RTNLGRP_IPV6_MROUTE, "ipv6-mroute" },
55		{ RTNLGRP_IPV6_ROUTE, "ipv6-route" },
56		{ RTNLGRP_IPV6_IFINFO, "ipv6-ifinfo" },
57		{ RTNLGRP_DECnet_IFADDR, "decnet-ifaddr" },
58		{ RTNLGRP_DECnet_ROUTE, "decnet-route" },
59		{ RTNLGRP_IPV6_PREFIX, "ipv6-prefix" },
60		{ RTNLGRP_NONE, NULL }
61	};
62
63	sock = nl_cli_alloc_socket();
64	nl_socket_disable_seq_check(sock);
65	nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
66
67	if (argc > 1 && !strcasecmp(argv[1], "-h")) {
68		printf("Usage: nl-monitor [<groups>]\n");
69
70		printf("Known groups:");
71		for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++)
72			printf(" %s", known_groups[i].gr_name);
73		printf("\n");
74		return 2;
75	}
76
77	nl_cli_connect(sock, NETLINK_ROUTE);
78
79	for (idx = 1; argc > idx; idx++) {
80		for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++) {
81			if (!strcmp(argv[idx], known_groups[i].gr_name)) {
82
83				if ((err = nl_socket_add_membership(sock, known_groups[i].gr_id)) < 0) {
84					nl_cli_fatal(err, "%s: %s\n", argv[idx],
85						     nl_geterror(err));
86				}
87
88				break;
89			}
90		}
91		if (known_groups[i].gr_id == RTNLGRP_NONE)
92			fprintf(stderr, "Warning: Unknown group: %s\n", argv[idx]);
93	}
94
95	link_cache = nl_cli_link_alloc_cache(sock);
96
97	while (1) {
98		fd_set rfds;
99		int fd, retval;
100
101		fd = nl_socket_get_fd(sock);
102
103		FD_ZERO(&rfds);
104		FD_SET(fd, &rfds);
105		/* wait for an incoming message on the netlink socket */
106		retval = select(fd+1, &rfds, NULL, NULL, NULL);
107
108		if (retval) {
109			/* FD_ISSET(fd, &rfds) will be true */
110			nl_recvmsgs_default(sock);
111		}
112	}
113
114	return 0;
115}
116