nl-monitor.c revision 44d362409d5469aed47d19e7908d19bd194493a4 
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) 2003-2006 Thomas Graf <tgraf@suug.ch>
10 */
11
12#include "utils.h"
13#include <netlink/route/link.h>
14#include <netlink/route/addr.h>
15
16static void obj_input(struct nl_object *obj, void *arg)
17{
18	struct nl_dump_params dp = {
19		.dp_type = NL_DUMP_STATS,
20		.dp_fd = stdout,
21		.dp_dump_msgtype = 1,
22	};
23
24	nl_object_dump(obj, &dp);
25}
26
27static int event_input(struct nl_msg *msg, void *arg)
28{
29	if (nl_msg_parse(msg, &obj_input, NULL) < 0)
30		fprintf(stderr, "<<EVENT>> Unknown message type\n");
31
32	/* Exit nl_recvmsgs_def() and return to the main select() */
33	return NL_STOP;
34}
35
36int main(int argc, char *argv[])
37{
38	struct nl_handle *nlh;
39	struct nl_cache *link_cache;
40	int err = 1;
41	int i, idx;
42
43	static const struct {
44		enum rtnetlink_groups gr_id;
45		const char* gr_name;
46	} known_groups[] = {
47		{ RTNLGRP_LINK, "link" },
48		{ RTNLGRP_NOTIFY, "notify" },
49		{ RTNLGRP_NEIGH, "neigh" },
50		{ RTNLGRP_TC, "tc" },
51		{ RTNLGRP_IPV4_IFADDR, "ipv4-ifaddr" },
52		{ RTNLGRP_IPV4_MROUTE, "ipv4-mroute" },
53		{ RTNLGRP_IPV4_ROUTE, "ipv4-route" },
54		{ RTNLGRP_IPV6_IFADDR, "ipv6-ifaddr" },
55		{ RTNLGRP_IPV6_MROUTE, "ipv6-mroute" },
56		{ RTNLGRP_IPV6_ROUTE, "ipv6-route" },
57		{ RTNLGRP_IPV6_IFINFO, "ipv6-ifinfo" },
58		{ RTNLGRP_DECnet_IFADDR, "decnet-ifaddr" },
59		{ RTNLGRP_DECnet_ROUTE, "decnet-route" },
60		{ RTNLGRP_IPV6_PREFIX, "ipv6-prefix" },
61		{ RTNLGRP_NONE, NULL }
62	};
63
64	if (nltool_init(argc, argv) < 0)
65		return -1;
66
67	nlh = nltool_alloc_handle();
68	if (nlh == NULL)
69		return -1;
70
71	nl_disable_sequence_check(nlh);
72
73	nl_socket_modify_cb(nlh, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
74
75	if (argc > 1 && !strcasecmp(argv[1], "-h")) {
76		printf("Usage: nl-monitor [<groups>]\n");
77
78		printf("Known groups:");
79		for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++)
80			printf(" %s", known_groups[i].gr_name);
81		printf("\n");
82		return 2;
83	}
84
85	if (nl_connect(nlh, NETLINK_ROUTE) < 0) {
86		fprintf(stderr, "%s\n", nl_geterror());
87		goto errout;
88	}
89
90	for (idx = 1; argc > idx; idx++) {
91		for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++) {
92			if (!strcmp(argv[idx], known_groups[i].gr_name)) {
93
94				if (nl_socket_add_membership(nlh, known_groups[i].gr_id) < 0) {
95					fprintf(stderr, "%s: %s\n", argv[idx], nl_geterror());
96					goto errout;
97				}
98
99				break;
100			}
101		}
102		if (known_groups[i].gr_id == RTNLGRP_NONE)
103			fprintf(stderr, "Warning: Unknown group: %s\n", argv[idx]);
104	}
105
106	if ((link_cache = rtnl_link_alloc_cache(nlh)) == NULL) {
107		fprintf(stderr, "%s\n", nl_geterror());
108		goto errout_close;
109	}
110
111	nl_cache_mngt_provide(link_cache);
112
113	while (1) {
114		fd_set rfds;
115		int fd, retval;
116
117		fd = nl_socket_get_fd(nlh);
118
119		FD_ZERO(&rfds);
120		FD_SET(fd, &rfds);
121		/* wait for an incoming message on the netlink socket */
122		retval = select(fd+1, &rfds, NULL, NULL, NULL);
123
124		if (retval) {
125			/* FD_ISSET(fd, &rfds) will be true */
126			nl_recvmsgs_default(nlh);
127		}
128	}
129
130	nl_cache_free(link_cache);
131errout_close:
132	nl_close(nlh);
133errout:
134	return err;
135}
136