bridge/monitor.c

   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 static 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(struct rtnl_ctrl_data *ctrl,
  39                       struct nlmsghdr *n, void *arg)
  40 {
  41         FILE *fp = arg;
  42
  43         if (timestamp)
  44                 print_timestamp(fp);
  45
  46         switch (n->nlmsg_type) {
  47         case RTM_NEWLINK:
  48         case RTM_DELLINK:
  49                 if (prefix_banner)
  50                         fprintf(fp, "[LINK]");
  51
  52                 return print_linkinfo(n, arg);
  53
  54         case RTM_NEWNEIGH:
  55         case RTM_DELNEIGH:
  56                 if (prefix_banner)
  57                         fprintf(fp, "[NEIGH]");
  58                 return print_fdb(n, arg);
  59
  60         case RTM_NEWMDB:
  61         case RTM_DELMDB:
  62                 if (prefix_banner)
  63                         fprintf(fp, "[MDB]");
  64                 return print_mdb(n, arg);
  65
  66         case NLMSG_TSTAMP:
  67                 print_nlmsg_timestamp(fp, n);
  68                 return 0;
  69
  70         default:
  71                 return 0;
  72         }
  73 }
  74
  75 int do_monitor(int argc, char **argv)
  76 {
  77         char *file = NULL;
  78         unsigned int groups = ~RTMGRP_TC;
  79         int llink = 0;
  80         int lneigh = 0;
  81         int lmdb = 0;
  82
  83         rtnl_close(&rth);
  84
  85         while (argc > 0) {
  86                 if (matches(*argv, "file") == 0) {
  87                         NEXT_ARG();
  88                         file = *argv;
  89                 } else if (matches(*argv, "link") == 0) {
  90                         llink = 1;
  91                         groups = 0;
  92                 } else if (matches(*argv, "fdb") == 0) {
  93                         lneigh = 1;
  94                         groups = 0;
  95                 } else if (matches(*argv, "mdb") == 0) {
  96                         lmdb = 1;
  97                         groups = 0;
  98                 } else if (strcmp(*argv, "all") == 0) {
  99                         groups = ~RTMGRP_TC;
 100                         prefix_banner = 1;
 101                 } else if (matches(*argv, "help") == 0) {
 102                         usage();
 103                 } else {
 104                         fprintf(stderr, "Argument \"%s\" is unknown, try \"bridge monitor help\".\n", *argv);
 105                         exit(-1);
 106                 }
 107                 argc--; argv++;
 108         }
 109
 110         if (llink)
 111                 groups |= nl_mgrp(RTNLGRP_LINK);
 112
 113         if (lneigh) {
 114                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 115         }
 116
 117         if (lmdb) {
 118                 groups |= nl_mgrp(RTNLGRP_MDB);
 119         }
 120
 121         if (file) {
 122                 FILE *fp;
 123                 int err;
 124
 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 }