1/*
2 * tc_monitor.c		"tc monitor".
3 *
4 *		This program is free software; you can redistribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Authors:	Jamal Hadi Salim
10 *
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <syslog.h>
17#include <fcntl.h>
18#include <sys/socket.h>
19#include <netinet/in.h>
20#include <arpa/inet.h>
21#include <string.h>
22#include <time.h>
23#include "rt_names.h"
24#include "utils.h"
25#include "tc_util.h"
26#include "tc_common.h"
27
28
29static void usage(void) __attribute__((noreturn));
30
31static void usage(void)
32{
33	fprintf(stderr, "Usage: tc [-timestamp [-tshort] monitor\n");
34	exit(-1);
35}
36
37
38static int accept_tcmsg(const struct sockaddr_nl *who,
39			struct rtnl_ctrl_data *ctrl,
40			struct nlmsghdr *n, void *arg)
41{
42	FILE *fp = (FILE*)arg;
43
44	if (timestamp)
45		print_timestamp(fp);
46
47	if (n->nlmsg_type == RTM_NEWTFILTER || n->nlmsg_type == RTM_DELTFILTER) {
48		print_filter(who, n, arg);
49		return 0;
50	}
51	if (n->nlmsg_type == RTM_NEWTCLASS || n->nlmsg_type == RTM_DELTCLASS) {
52		print_class(who, n, arg);
53		return 0;
54	}
55	if (n->nlmsg_type == RTM_NEWQDISC || n->nlmsg_type == RTM_DELQDISC) {
56		print_qdisc(who, n, arg);
57		return 0;
58	}
59	if (n->nlmsg_type == RTM_GETACTION || n->nlmsg_type == RTM_NEWACTION ||
60	    n->nlmsg_type == RTM_DELACTION) {
61		print_action(who, n, arg);
62		return 0;
63	}
64	if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
65	    n->nlmsg_type != NLMSG_DONE) {
66		fprintf(fp, "Unknown message: length %08d type %08x flags %08x\n",
67			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
68	}
69	return 0;
70}
71
72int do_tcmonitor(int argc, char **argv)
73{
74	struct rtnl_handle rth;
75	char *file = NULL;
76	unsigned groups = nl_mgrp(RTNLGRP_TC);
77
78	while (argc > 0) {
79		if (matches(*argv, "file") == 0) {
80			NEXT_ARG();
81			file = *argv;
82		} else {
83			if (matches(*argv, "help") == 0) {
84				usage();
85			} else {
86				fprintf(stderr, "Argument \"%s\" is unknown, try \"tc monitor help\".\n", *argv);
87				exit(-1);
88			}
89		}
90		argc--;	argv++;
91	}
92
93	if (file) {
94		FILE *fp = fopen(file, "r");
95		int ret;
96
97		if (fp == NULL) {
98			perror("Cannot fopen");
99			exit(-1);
100		}
101
102		ret = rtnl_from_file(fp, accept_tcmsg, stdout);
103		fclose(fp);
104		return ret;
105	}
106
107	if (rtnl_open(&rth, groups) < 0)
108		exit(1);
109
110	ll_init_map(&rth);
111
112	if (rtnl_listen(&rth, accept_tcmsg, (void*)stdout) < 0) {
113		rtnl_close(&rth);
114		exit(2);
115	}
116
117	rtnl_close(&rth);
118	exit(0);
119}
120