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 == RTM_NEWNETCONF) {
  89                 if (prefix_banner)
  90                         fprintf(fp, "[NETCONF]");
  91                 print_netconf(who, n, arg);
  92                 return 0;
  93         }
  94         if (n->nlmsg_type == 15) {
  95                 char *tstr;
  96                 time_t secs = ((__u32*)NLMSG_DATA(n))[0];
  97                 long usecs = ((__u32*)NLMSG_DATA(n))[1];
  98                 tstr = asctime(localtime(&secs));
  99                 tstr[strlen(tstr)-1] = 0;
 100                 fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
 101                 return 0;
 102         }
 103         if (n->nlmsg_type == RTM_NEWQDISC ||
 104             n->nlmsg_type == RTM_DELQDISC ||
 105             n->nlmsg_type == RTM_NEWTCLASS ||
 106             n->nlmsg_type == RTM_DELTCLASS ||
 107             n->nlmsg_type == RTM_NEWTFILTER ||
 108             n->nlmsg_type == RTM_DELTFILTER)
 109                 return 0;
 110         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
 111             n->nlmsg_type != NLMSG_DONE) {
 112                 fprintf(fp, "Unknown message: %08x %08x %08x\n",
 113                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 114         }
 115         return 0;
 116 }
 117
 118 int do_ipmonitor(int argc, char **argv)
 119 {
 120         char *file = NULL;
 121         unsigned groups = ~RTMGRP_TC;
 122         int llink=0;
 123         int laddr=0;
 124         int lroute=0;
 125         int lprefix=0;
 126         int lneigh=0;
 127         int lnetconf=0;
 128
 129         rtnl_close(&rth);
 130         ipaddr_reset_filter(1);
 131         iproute_reset_filter();
 132         ipneigh_reset_filter();
 133
 134         while (argc > 0) {
 135                 if (matches(*argv, "file") == 0) {
 136                         NEXT_ARG();
 137                         file = *argv;
 138                 } else if (matches(*argv, "link") == 0) {
 139                         llink=1;
 140                         groups = 0;
 141                 } else if (matches(*argv, "address") == 0) {
 142                         laddr=1;
 143                         groups = 0;
 144                 } else if (matches(*argv, "route") == 0) {
 145                         lroute=1;
 146                         groups = 0;
 147                 } else if (matches(*argv, "prefix") == 0) {
 148                         lprefix=1;
 149                         groups = 0;
 150                 } else if (matches(*argv, "neigh") == 0) {
 151                         lneigh = 1;
 152                         groups = 0;
 153                 } else if (matches(*argv, "netconf") == 0) {
 154                         lnetconf = 1;
 155                         groups = 0;
 156                 } else if (strcmp(*argv, "all") == 0) {
 157                         groups = ~RTMGRP_TC;
 158                         prefix_banner=1;
 159                 } else if (matches(*argv, "help") == 0) {
 160                         usage();
 161                 } else {
 162                         fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 163                         exit(-1);
 164                 }
 165                 argc--; argv++;
 166         }
 167
 168         if (llink)
 169                 groups |= nl_mgrp(RTNLGRP_LINK);
 170         if (laddr) {
 171                 if (!preferred_family || preferred_family == AF_INET)
 172                         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 173                 if (!preferred_family || preferred_family == AF_INET6)
 174                         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 175         }
 176         if (lroute) {
 177                 if (!preferred_family || preferred_family == AF_INET)
 178                         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 179                 if (!preferred_family || preferred_family == AF_INET6)
 180                         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 181         }
 182         if (lprefix) {
 183                 if (!preferred_family || preferred_family == AF_INET6)
 184                         groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 185         }
 186         if (lneigh) {
 187                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 188         }
 189         if (lnetconf) {
 190                 if (!preferred_family || preferred_family == AF_INET)
 191                         groups |= nl_mgrp(RTNLGRP_IPV4_NETCONF);
 192                 if (!preferred_family || preferred_family == AF_INET6)
 193                         groups |= nl_mgrp(RTNLGRP_IPV6_NETCONF);
 194         }
 195         if (file) {
 196                 FILE *fp;
 197                 fp = fopen(file, "r");
 198                 if (fp == NULL) {
 199                         perror("Cannot fopen");
 200                         exit(-1);
 201                 }
 202                 return rtnl_from_file(fp, accept_msg, stdout);
 203         }
 204
 205         if (rtnl_open(&rth, groups) < 0)
 206                 exit(1);
 207         ll_init_map(&rth);
 208
 209         if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 210                 exit(2);
 211
 212         return 0;
 213 }