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      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 (at) 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 
     32 static void usage(void)
     33 {
     34 	fprintf(stderr, "Usage: bridge monitor [file | link | fdb | mdb | all]\n");
     35 	exit(-1);
     36 }
     37 
     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 
     76 int do_monitor(int argc, char **argv)
     77 {
     78 	char *file = NULL;
     79 	unsigned int 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 
    126 		fp = fopen(file, "r");
    127 		if (fp == NULL) {
    128 			perror("Cannot fopen");
    129 			exit(-1);
    130 		}
    131 		err = rtnl_from_file(fp, accept_msg, stdout);
    132 		fclose(fp);
    133 		return err;
    134 	}
    135 
    136 	if (rtnl_open(&rth, groups) < 0)
    137 		exit(1);
    138 	ll_init_map(&rth);
    139 
    140 	if (rtnl_listen(&rth, accept_msg, stdout) < 0)
    141 		exit(2);
    142 
    143 	return 0;
    144 }
    145