ip/ipmonitor.c

   1 /*
   2  * ipmonitor.c          "ip 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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  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
  24 #include "utils.h"
  25 #include "ip_common.h"
  26
  27 static void usage(void) __attribute__((noreturn));
  28
  29 static void usage(void)
  30 {
  31         fprintf(stderr, "Usage: ip monitor [ all | LISTofOBJECTS ]\n");
  32         exit(-1);
  33 }
  34
  35
  36 int accept_msg(const struct sockaddr_nl *who,
  37                struct nlmsghdr *n, void *arg)
  38 {
  39         FILE *fp = (FILE*)arg;
  40
  41         if (n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) {
  42                 print_route(who, n, arg);
  43                 return 0;
  44         }
  45         if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
  46                 ll_remember_index(who, n, NULL);
  47                 print_linkinfo(who, n, arg);
  48                 return 0;
  49         }
  50         if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
  51                 print_addrinfo(who, n, arg);
  52                 return 0;
  53         }
  54         if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH) {
  55                 print_neigh(who, n, arg);
  56                 return 0;
  57         }
  58         if (n->nlmsg_type == RTM_NEWPREFIX) {
  59                 print_prefix(who, n, arg);
  60                 return 0;
  61         }
  62         if (n->nlmsg_type == 15) {
  63                 char *tstr;
  64                 time_t secs = ((__u32*)NLMSG_DATA(n))[0];
  65                 long usecs = ((__u32*)NLMSG_DATA(n))[1];
  66                 tstr = asctime(localtime(&secs));
  67                 tstr[strlen(tstr)-1] = 0;
  68                 fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
  69                 return 0;
  70         }
  71         if (n->nlmsg_type == RTM_NEWQDISC ||
  72             n->nlmsg_type == RTM_DELQDISC ||
  73             n->nlmsg_type == RTM_NEWTCLASS ||
  74             n->nlmsg_type == RTM_DELTCLASS ||
  75             n->nlmsg_type == RTM_NEWTFILTER ||
  76             n->nlmsg_type == RTM_DELTFILTER)
  77                 return 0;
  78         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
  79             n->nlmsg_type != NLMSG_DONE) {
  80                 fprintf(fp, "Unknown message: %08x %08x %08x\n",
  81                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  82         }
  83         return 0;
  84 }
  85
  86 int do_ipmonitor(int argc, char **argv)
  87 {
  88         struct rtnl_handle rth;
  89         char *file = NULL;
  90         unsigned groups = ~RTMGRP_TC;
  91         int llink=0;
  92         int laddr=0;
  93         int lroute=0;
  94         int lprefix=0;
  95
  96         ipaddr_reset_filter(1);
  97         iproute_reset_filter();
  98         ipneigh_reset_filter();
  99
 100         while (argc > 0) {
 101                 if (matches(*argv, "file") == 0) {
 102                         NEXT_ARG();
 103                         file = *argv;
 104                 } else if (matches(*argv, "link") == 0) {
 105                         llink=1;
 106                         groups = 0;
 107                 } else if (matches(*argv, "address") == 0) {
 108                         laddr=1;
 109                         groups = 0;
 110                 } else if (matches(*argv, "route") == 0) {
 111                         lroute=1;
 112                         groups = 0;
 113                 } else if (matches(*argv, "prefix") == 0) {
 114                         lprefix=1;
 115                         groups = 0;
 116                 } else if (strcmp(*argv, "all") == 0) {
 117                         groups = ~RTMGRP_TC;
 118                 } else if (matches(*argv, "help") == 0) {
 119                         usage();
 120                 } else {
 121                         fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 122                         exit(-1);
 123                 }
 124                 argc--; argv++;
 125         }
 126
 127         if (llink)
 128                 groups |= RTMGRP_LINK;
 129         if (laddr) {
 130                 if (!preferred_family || preferred_family == AF_INET)
 131                         groups |= RTMGRP_IPV4_IFADDR;
 132                 if (!preferred_family || preferred_family == AF_INET6)
 133                         groups |= RTMGRP_IPV6_IFADDR;
 134         }
 135         if (lroute) {
 136                 if (!preferred_family || preferred_family == AF_INET)
 137                         groups |= RTMGRP_IPV4_ROUTE;
 138                 if (!preferred_family || preferred_family == AF_INET6)
 139                         groups |= RTMGRP_IPV6_ROUTE;
 140         }
 141         if (lprefix) {
 142                 if (!preferred_family || preferred_family == AF_INET6)
 143                         groups |= RTMGRP_IPV6_PREFIX;
 144         }
 145
 146         if (file) {
 147                 FILE *fp;
 148                 fp = fopen(file, "r");
 149                 if (fp == NULL) {
 150                         perror("Cannot fopen");
 151                         exit(-1);
 152                 }
 153                 return rtnl_from_file(fp, accept_msg, (void*)stdout);
 154         }
 155
 156         if (rtnl_open(&rth, groups) < 0)
 157                 exit(1);
 158
 159         ll_init_map(&rth);
 160
 161         if (rtnl_listen(&rth, accept_msg, (void*)stdout) < 0)
 162                 exit(2);
 163
 164         exit(0);
 165 }