1 /*
2 * brmonitor.c "bridge 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: Stephen Hemminger <shemminger@vyatta.com>
10 *
11 */
12
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <unistd.h>
16 #include <time.h>
17 #include <sys/socket.h>
18 #include <sys/time.h>
19 #include <net/if.h>
20 #include <netinet/in.h>
21 #include <linux/if_bridge.h>
22 #include <linux/neighbour.h>
23 #include <string.h>
24
25 #include "utils.h"
26 #include "br_common.h"
27
28
29 static void usage(void) __attribute__((noreturn));
30 int prefix_banner;
31
usage(void)32 static void usage(void)
33 {
34 fprintf(stderr, "Usage: bridge monitor [file | link | fdb | mdb | all]\n");
35 exit(-1);
36 }
37
accept_msg(const struct sockaddr_nl * who,struct rtnl_ctrl_data * ctrl,struct nlmsghdr * n,void * arg)38 static int accept_msg(const struct sockaddr_nl *who,
39 struct rtnl_ctrl_data *ctrl,
40 struct nlmsghdr *n, void *arg)
41 {
42 FILE *fp = arg;
43
44 if (timestamp)
45 print_timestamp(fp);
46
47 switch (n->nlmsg_type) {
48 case RTM_NEWLINK:
49 case RTM_DELLINK:
50 if (prefix_banner)
51 fprintf(fp, "[LINK]");
52
53 return print_linkinfo(who, n, arg);
54
55 case RTM_NEWNEIGH:
56 case RTM_DELNEIGH:
57 if (prefix_banner)
58 fprintf(fp, "[NEIGH]");
59 return print_fdb(who, n, arg);
60
61 case RTM_NEWMDB:
62 case RTM_DELMDB:
63 if (prefix_banner)
64 fprintf(fp, "[MDB]");
65 return print_mdb(who, n, arg);
66
67 case NLMSG_TSTAMP:
68 print_nlmsg_timestamp(fp, n);
69 return 0;
70
71 default:
72 return 0;
73 }
74 }
75
do_monitor(int argc,char ** argv)76 int do_monitor(int argc, char **argv)
77 {
78 char *file = NULL;
79 unsigned groups = ~RTMGRP_TC;
80 int llink=0;
81 int lneigh=0;
82 int lmdb=0;
83
84 rtnl_close(&rth);
85
86 while (argc > 0) {
87 if (matches(*argv, "file") == 0) {
88 NEXT_ARG();
89 file = *argv;
90 } else if (matches(*argv, "link") == 0) {
91 llink=1;
92 groups = 0;
93 } else if (matches(*argv, "fdb") == 0) {
94 lneigh = 1;
95 groups = 0;
96 } else if (matches(*argv, "mdb") == 0) {
97 lmdb = 1;
98 groups = 0;
99 } else if (strcmp(*argv, "all") == 0) {
100 groups = ~RTMGRP_TC;
101 prefix_banner=1;
102 } else if (matches(*argv, "help") == 0) {
103 usage();
104 } else {
105 fprintf(stderr, "Argument \"%s\" is unknown, try \"bridge monitor help\".\n", *argv);
106 exit(-1);
107 }
108 argc--; argv++;
109 }
110
111 if (llink)
112 groups |= nl_mgrp(RTNLGRP_LINK);
113
114 if (lneigh) {
115 groups |= nl_mgrp(RTNLGRP_NEIGH);
116 }
117
118 if (lmdb) {
119 groups |= nl_mgrp(RTNLGRP_MDB);
120 }
121
122 if (file) {
123 FILE *fp;
124 int err;
125 fp = fopen(file, "r");
126 if (fp == NULL) {
127 perror("Cannot fopen");
128 exit(-1);
129 }
130 err = rtnl_from_file(fp, accept_msg, stdout);
131 fclose(fp);
132 return err;
133 }
134
135 if (rtnl_open(&rth, groups) < 0)
136 exit(1);
137 ll_init_map(&rth);
138
139 if (rtnl_listen(&rth, accept_msg, stdout) < 0)
140 exit(2);
141
142 return 0;
143 }
144
145