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 (timestamp)
  42                 print_timestamp(fp);
  43
  44         if (n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) {
  45                 print_route(who, n, arg);
  46                 return 0;
  47         }
  48         if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
  49                 ll_remember_index(who, n, NULL);
  50                 print_linkinfo(who, n, arg);
  51                 return 0;
  52         }
  53         if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
  54                 print_addrinfo(who, n, arg);
  55                 return 0;
  56         }
  57         if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH) {
  58                 print_neigh(who, n, arg);
  59                 return 0;
  60         }
  61         if (n->nlmsg_type == RTM_NEWPREFIX) {
  62                 print_prefix(who, n, arg);
  63                 return 0;
  64         }
  65         if (n->nlmsg_type == 15) {
  66                 char *tstr;
  67                 time_t secs = ((__u32*)NLMSG_DATA(n))[0];
  68                 long usecs = ((__u32*)NLMSG_DATA(n))[1];
  69                 tstr = asctime(localtime(&secs));
  70                 tstr[strlen(tstr)-1] = 0;
  71                 fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
  72                 return 0;
  73         }
  74         if (n->nlmsg_type == RTM_NEWQDISC ||
  75             n->nlmsg_type == RTM_DELQDISC ||
  76             n->nlmsg_type == RTM_NEWTCLASS ||
  77             n->nlmsg_type == RTM_DELTCLASS ||
  78             n->nlmsg_type == RTM_NEWTFILTER ||
  79             n->nlmsg_type == RTM_DELTFILTER)
  80                 return 0;
  81         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
  82             n->nlmsg_type != NLMSG_DONE) {
  83                 fprintf(fp, "Unknown message: %08x %08x %08x\n",
  84                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  85         }
  86         return 0;
  87 }
  88
  89 int do_ipmonitor(int argc, char **argv)
  90 {
  91         struct rtnl_handle rth;
  92         char *file = NULL;
  93         unsigned groups = ~RTMGRP_TC;
  94         int llink=0;
  95         int laddr=0;
  96         int lroute=0;
  97         int lprefix=0;
  98
  99         ipaddr_reset_filter(1);
 100         iproute_reset_filter();
 101         ipneigh_reset_filter();
 102
 103         while (argc > 0) {
 104                 if (matches(*argv, "file") == 0) {
 105                         NEXT_ARG();
 106                         file = *argv;
 107                 } else if (matches(*argv, "link") == 0) {
 108                         llink=1;
 109                         groups = 0;
 110                 } else if (matches(*argv, "address") == 0) {
 111                         laddr=1;
 112                         groups = 0;
 113                 } else if (matches(*argv, "route") == 0) {
 114                         lroute=1;
 115                         groups = 0;
 116                 } else if (matches(*argv, "prefix") == 0) {
 117                         lprefix=1;
 118                         groups = 0;
 119                 } else if (strcmp(*argv, "all") == 0) {
 120                         groups = ~RTMGRP_TC;
 121                 } else if (matches(*argv, "help") == 0) {
 122                         usage();
 123                 } else {
 124                         fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 125                         exit(-1);
 126                 }
 127                 argc--; argv++;
 128         }
 129
 130         if (llink)
 131                 groups |= RTMGRP_LINK;
 132         if (laddr) {
 133                 if (!preferred_family || preferred_family == AF_INET)
 134                         groups |= RTMGRP_IPV4_IFADDR;
 135                 if (!preferred_family || preferred_family == AF_INET6)
 136                         groups |= RTMGRP_IPV6_IFADDR;
 137         }
 138         if (lroute) {
 139                 if (!preferred_family || preferred_family == AF_INET)
 140                         groups |= RTMGRP_IPV4_ROUTE;
 141                 if (!preferred_family || preferred_family == AF_INET6)
 142                         groups |= RTMGRP_IPV6_ROUTE;
 143         }
 144         if (lprefix) {
 145                 if (!preferred_family || preferred_family == AF_INET6)
 146                         groups |= RTMGRP_IPV6_PREFIX;
 147         }
 148
 149         if (file) {
 150                 FILE *fp;
 151                 fp = fopen(file, "r");
 152                 if (fp == NULL) {
 153                         perror("Cannot fopen");
 154                         exit(-1);
 155                 }
 156                 return rtnl_from_file(fp, accept_msg, (void*)stdout);
 157         }
 158
 159         if (rtnl_open(&rth, groups) < 0)
 160                 exit(1);
 161
 162         ll_init_map(&rth);
 163
 164         if (rtnl_listen(&rth, accept_msg, (void*)stdout) < 0)
 165                 exit(2);
 166
 167         exit(0);
 168 }