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 ] [ FILE ] [ label ]\n");
  33         fprintf(stderr, "LISTofOBJECTS := link | address | route | mroute | prefix |\n");
  34         fprintf(stderr, "                 neigh | netconf\n");
  35         fprintf(stderr, "FILE := file FILENAME\n");
  36         exit(-1);
  37 }
  38
  39
  40 static int accept_msg(const struct sockaddr_nl *who,
  41                       struct nlmsghdr *n, void *arg)
  42 {
  43         FILE *fp = (FILE*)arg;
  44
  45         if (timestamp)
  46                 print_timestamp(fp);
  47
  48         if (n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) {
  49                 struct rtmsg *r = NLMSG_DATA(n);
  50                 int len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
  51
  52                 if (len < 0) {
  53                         fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  54                         return -1;
  55                 }
  56
  57                 if (r->rtm_family == RTNL_FAMILY_IPMR ||
  58                     r->rtm_family == RTNL_FAMILY_IP6MR) {
  59                         if (prefix_banner)
  60                                 fprintf(fp, "[MROUTE]");
  61                         print_mroute(who, n, arg);
  62                         return 0;
  63                 } else {
  64                         if (prefix_banner)
  65                                 fprintf(fp, "[ROUTE]");
  66                         print_route(who, n, arg);
  67                         return 0;
  68                 }
  69         }
  70         if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
  71                 ll_remember_index(who, n, NULL);
  72                 if (prefix_banner)
  73                         fprintf(fp, "[LINK]");
  74                 print_linkinfo(who, n, arg);
  75                 return 0;
  76         }
  77         if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
  78                 if (prefix_banner)
  79                         fprintf(fp, "[ADDR]");
  80                 print_addrinfo(who, n, arg);
  81                 return 0;
  82         }
  83         if (n->nlmsg_type == RTM_NEWADDRLABEL || n->nlmsg_type == RTM_DELADDRLABEL) {
  84                 if (prefix_banner)
  85                         fprintf(fp, "[ADDRLABEL]");
  86                 print_addrlabel(who, n, arg);
  87                 return 0;
  88         }
  89         if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH ||
  90             n->nlmsg_type == RTM_GETNEIGH) {
  91                 if (prefix_banner)
  92                         fprintf(fp, "[NEIGH]");
  93                 print_neigh(who, n, arg);
  94                 return 0;
  95         }
  96         if (n->nlmsg_type == RTM_NEWPREFIX) {
  97                 if (prefix_banner)
  98                         fprintf(fp, "[PREFIX]");
  99                 print_prefix(who, n, arg);
 100                 return 0;
 101         }
 102         if (n->nlmsg_type == RTM_NEWRULE || n->nlmsg_type == RTM_DELRULE) {
 103                 if (prefix_banner)
 104                         fprintf(fp, "[RULE]");
 105                 print_rule(who, n, arg);
 106                 return 0;
 107         }
 108         if (n->nlmsg_type == RTM_NEWNETCONF) {
 109                 if (prefix_banner)
 110                         fprintf(fp, "[NETCONF]");
 111                 print_netconf(who, n, arg);
 112                 return 0;
 113         }
 114         if (n->nlmsg_type == 15) {
 115                 char *tstr;
 116                 time_t secs = ((__u32*)NLMSG_DATA(n))[0];
 117                 long usecs = ((__u32*)NLMSG_DATA(n))[1];
 118                 tstr = asctime(localtime(&secs));
 119                 tstr[strlen(tstr)-1] = 0;
 120                 fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
 121                 return 0;
 122         }
 123         if (n->nlmsg_type == RTM_NEWQDISC ||
 124             n->nlmsg_type == RTM_DELQDISC ||
 125             n->nlmsg_type == RTM_NEWTCLASS ||
 126             n->nlmsg_type == RTM_DELTCLASS ||
 127             n->nlmsg_type == RTM_NEWTFILTER ||
 128             n->nlmsg_type == RTM_DELTFILTER)
 129                 return 0;
 130         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
 131             n->nlmsg_type != NLMSG_DONE) {
 132                 fprintf(fp, "Unknown message: %08x %08x %08x\n",
 133                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 134         }
 135         return 0;
 136 }
 137
 138 int do_ipmonitor(int argc, char **argv)
 139 {
 140         char *file = NULL;
 141         unsigned groups = ~RTMGRP_TC;
 142         int llink=0;
 143         int laddr=0;
 144         int lroute=0;
 145         int lmroute=0;
 146         int lprefix=0;
 147         int lneigh=0;
 148         int lnetconf=0;
 149
 150         rtnl_close(&rth);
 151         ipaddr_reset_filter(1);
 152         iproute_reset_filter();
 153         ipmroute_reset_filter();
 154         ipneigh_reset_filter();
 155
 156         while (argc > 0) {
 157                 if (matches(*argv, "file") == 0) {
 158                         NEXT_ARG();
 159                         file = *argv;
 160                 } else if (matches(*argv, "label") == 0) {
 161                         prefix_banner = 1;
 162                 } else if (matches(*argv, "link") == 0) {
 163                         llink=1;
 164                         groups = 0;
 165                 } else if (matches(*argv, "address") == 0) {
 166                         laddr=1;
 167                         groups = 0;
 168                 } else if (matches(*argv, "route") == 0) {
 169                         lroute=1;
 170                         groups = 0;
 171                 } else if (matches(*argv, "mroute") == 0) {
 172                         lmroute=1;
 173                         groups = 0;
 174                 } else if (matches(*argv, "prefix") == 0) {
 175                         lprefix=1;
 176                         groups = 0;
 177                 } else if (matches(*argv, "neigh") == 0) {
 178                         lneigh = 1;
 179                         groups = 0;
 180                 } else if (matches(*argv, "netconf") == 0) {
 181                         lnetconf = 1;
 182                         groups = 0;
 183                 } else if (strcmp(*argv, "all") == 0) {
 184                         groups = ~RTMGRP_TC;
 185                         prefix_banner=1;
 186                 } else if (matches(*argv, "help") == 0) {
 187                         usage();
 188                 } else {
 189                         fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 190                         exit(-1);
 191                 }
 192                 argc--; argv++;
 193         }
 194
 195         if (llink)
 196                 groups |= nl_mgrp(RTNLGRP_LINK);
 197         if (laddr) {
 198                 if (!preferred_family || preferred_family == AF_INET)
 199                         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 200                 if (!preferred_family || preferred_family == AF_INET6)
 201                         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 202         }
 203         if (lroute) {
 204                 if (!preferred_family || preferred_family == AF_INET)
 205                         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 206                 if (!preferred_family || preferred_family == AF_INET6)
 207                         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 208         }
 209         if (lmroute) {
 210                 if (!preferred_family || preferred_family == AF_INET)
 211                         groups |= nl_mgrp(RTNLGRP_IPV4_MROUTE);
 212                 if (!preferred_family || preferred_family == AF_INET6)
 213                         groups |= nl_mgrp(RTNLGRP_IPV6_MROUTE);
 214         }
 215         if (lprefix) {
 216                 if (!preferred_family || preferred_family == AF_INET6)
 217                         groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 218         }
 219         if (lneigh) {
 220                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 221         }
 222         if (lnetconf) {
 223                 if (!preferred_family || preferred_family == AF_INET)
 224                         groups |= nl_mgrp(RTNLGRP_IPV4_NETCONF);
 225                 if (!preferred_family || preferred_family == AF_INET6)
 226                         groups |= nl_mgrp(RTNLGRP_IPV6_NETCONF);
 227         }
 228         if (file) {
 229                 FILE *fp;
 230                 fp = fopen(file, "r");
 231                 if (fp == NULL) {
 232                         perror("Cannot fopen");
 233                         exit(-1);
 234                 }
 235                 return rtnl_from_file(fp, accept_msg, stdout);
 236         }
 237
 238         if (rtnl_open(&rth, groups) < 0)
 239                 exit(1);
 240         ll_init_map(&rth);
 241
 242         if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 243                 exit(2);
 244
 245         return 0;
 246 }