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 int prefix_banner;
  29
  30 static void usage(void)
  31 {
  32         fprintf(stderr, "Usage: ip monitor [ all | LISTofOBJECTS ]\n");
  33         exit(-1);
  34 }
  35
  36
  37 int accept_msg(const struct sockaddr_nl *who,
  38                struct nlmsghdr *n, void *arg)
  39 {
  40         FILE *fp = (FILE*)arg;
  41
  42         if (timestamp)
  43                 print_timestamp(fp);
  44
  45         if (n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) {
  46                 if (prefix_banner)
  47                         fprintf(fp, "[ROUTE]");
  48                 print_route(who, n, arg);
  49                 return 0;
  50         }
  51         if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
  52                 ll_remember_index(who, n, NULL);
  53                 if (prefix_banner)
  54                         fprintf(fp, "[LINK]");
  55                 print_linkinfo(who, n, arg);
  56                 return 0;
  57         }
  58         if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
  59                 if (prefix_banner)
  60                         fprintf(fp, "[ADDR]");
  61                 print_addrinfo(who, n, arg);
  62                 return 0;
  63         }
  64         if (n->nlmsg_type == RTM_NEWADDRLABEL || n->nlmsg_type == RTM_DELADDRLABEL) {
  65                 if (prefix_banner)
  66                         fprintf(fp, "[ADDRLABEL]");
  67                 print_addrlabel(who, n, arg);
  68                 return 0;
  69         }
  70         if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH) {
  71                 if (prefix_banner)
  72                         fprintf(fp, "[NEIGH]");
  73                 print_neigh(who, n, arg);
  74                 return 0;
  75         }
  76         if (n->nlmsg_type == RTM_NEWPREFIX) {
  77                 if (prefix_banner)
  78                         fprintf(fp, "[PREFIX]");
  79                 print_prefix(who, n, arg);
  80                 return 0;
  81         }
  82         if (n->nlmsg_type == RTM_NEWRULE || n->nlmsg_type == RTM_DELRULE) {
  83                 if (prefix_banner)
  84                         fprintf(fp, "[RULE]");
  85                 print_rule(who, n, arg);
  86                 return 0;
  87         }
  88         if (n->nlmsg_type == 15) {
  89                 char *tstr;
  90                 time_t secs = ((__u32*)NLMSG_DATA(n))[0];
  91                 long usecs = ((__u32*)NLMSG_DATA(n))[1];
  92                 tstr = asctime(localtime(&secs));
  93                 tstr[strlen(tstr)-1] = 0;
  94                 fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
  95                 return 0;
  96         }
  97         if (n->nlmsg_type == RTM_NEWQDISC ||
  98             n->nlmsg_type == RTM_DELQDISC ||
  99             n->nlmsg_type == RTM_NEWTCLASS ||
 100             n->nlmsg_type == RTM_DELTCLASS ||
 101             n->nlmsg_type == RTM_NEWTFILTER ||
 102             n->nlmsg_type == RTM_DELTFILTER)
 103                 return 0;
 104         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
 105             n->nlmsg_type != NLMSG_DONE) {
 106                 fprintf(fp, "Unknown message: %08x %08x %08x\n",
 107                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 108         }
 109         return 0;
 110 }
 111
 112 int do_ipmonitor(int argc, char **argv)
 113 {
 114         char *file = NULL;
 115         unsigned groups = ~RTMGRP_TC;
 116         int llink=0;
 117         int laddr=0;
 118         int lroute=0;
 119         int lprefix=0;
 120         int lneigh=0;
 121
 122         rtnl_close(&rth);
 123         ipaddr_reset_filter(1);
 124         iproute_reset_filter();
 125         ipneigh_reset_filter();
 126
 127         while (argc > 0) {
 128                 if (matches(*argv, "file") == 0) {
 129                         NEXT_ARG();
 130                         file = *argv;
 131                 } else if (matches(*argv, "link") == 0) {
 132                         llink=1;
 133                         groups = 0;
 134                 } else if (matches(*argv, "address") == 0) {
 135                         laddr=1;
 136                         groups = 0;
 137                 } else if (matches(*argv, "route") == 0) {
 138                         lroute=1;
 139                         groups = 0;
 140                 } else if (matches(*argv, "prefix") == 0) {
 141                         lprefix=1;
 142                         groups = 0;
 143                 } else if (matches(*argv, "neigh") == 0) {
 144                         lneigh = 1;
 145                         groups = 0;
 146                 } else if (strcmp(*argv, "all") == 0) {
 147                         groups = ~RTMGRP_TC;
 148                         prefix_banner=1;
 149                 } else if (matches(*argv, "help") == 0) {
 150                         usage();
 151                 } else {
 152                         fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 153                         exit(-1);
 154                 }
 155                 argc--; argv++;
 156         }
 157
 158         if (llink)
 159                 groups |= nl_mgrp(RTNLGRP_LINK);
 160         if (laddr) {
 161                 if (!preferred_family || preferred_family == AF_INET)
 162                         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 163                 if (!preferred_family || preferred_family == AF_INET6)
 164                         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 165         }
 166         if (lroute) {
 167                 if (!preferred_family || preferred_family == AF_INET)
 168                         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 169                 if (!preferred_family || preferred_family == AF_INET6)
 170                         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 171         }
 172         if (lprefix) {
 173                 if (!preferred_family || preferred_family == AF_INET6)
 174                         groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 175         }
 176         if (lneigh) {
 177                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 178         }
 179         if (file) {
 180                 FILE *fp;
 181                 fp = fopen(file, "r");
 182                 if (fp == NULL) {
 183                         perror("Cannot fopen");
 184                         exit(-1);
 185                 }
 186                 return rtnl_from_file(fp, accept_msg, stdout);
 187         }
 188
 189         if (rtnl_open(&rth, groups) < 0)
 190                 exit(1);
 191         ll_init_map(&rth);
 192
 193         if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 194                 exit(2);
 195
 196         return 0;
 197 }