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 ]"
  33                         "[ label ] [dev DEVICE]\n");
  34         fprintf(stderr, "LISTofOBJECTS := link | address | route | mroute | prefix |\n");
  35         fprintf(stderr, "                 neigh | netconf | rule | nsid\n");
  36         fprintf(stderr, "FILE := file FILENAME\n");
  37         exit(-1);
  38 }
  39
  40 static int accept_msg(const struct sockaddr_nl *who,
  41                       struct rtnl_ctrl_data *ctrl,
  42                       struct nlmsghdr *n, void *arg)
  43 {
  44         FILE *fp = (FILE*)arg;
  45
  46         if (n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) {
  47                 struct rtmsg *r = NLMSG_DATA(n);
  48                 int len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
  49
  50                 if (len < 0) {
  51                         fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  52                         return -1;
  53                 }
  54
  55                 if (r->rtm_flags & RTM_F_CLONED)
  56                         return 0;
  57
  58                 if (timestamp)
  59                         print_timestamp(fp);
  60
  61                 if (r->rtm_family == RTNL_FAMILY_IPMR ||
  62                     r->rtm_family == RTNL_FAMILY_IP6MR) {
  63                         if (prefix_banner)
  64                                 fprintf(fp, "[MROUTE]");
  65                         print_mroute(who, n, arg);
  66                         return 0;
  67                 } else {
  68                         if (prefix_banner)
  69                                 fprintf(fp, "[ROUTE]");
  70                         print_route(who, n, arg);
  71                         return 0;
  72                 }
  73         }
  74
  75         if (timestamp)
  76                 print_timestamp(fp);
  77
  78         if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
  79                 ll_remember_index(who, n, NULL);
  80                 if (prefix_banner)
  81                         fprintf(fp, "[LINK]");
  82                 print_linkinfo(who, n, arg);
  83                 return 0;
  84         }
  85         if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
  86                 if (prefix_banner)
  87                         fprintf(fp, "[ADDR]");
  88                 print_addrinfo(who, n, arg);
  89                 return 0;
  90         }
  91         if (n->nlmsg_type == RTM_NEWADDRLABEL || n->nlmsg_type == RTM_DELADDRLABEL) {
  92                 if (prefix_banner)
  93                         fprintf(fp, "[ADDRLABEL]");
  94                 print_addrlabel(who, n, arg);
  95                 return 0;
  96         }
  97         if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH ||
  98             n->nlmsg_type == RTM_GETNEIGH) {
  99                 if (preferred_family) {
 100                         struct ndmsg *r = NLMSG_DATA(n);
 101
 102                         if (r->ndm_family != preferred_family)
 103                                 return 0;
 104                 }
 105
 106                 if (prefix_banner)
 107                         fprintf(fp, "[NEIGH]");
 108                 print_neigh(who, n, arg);
 109                 return 0;
 110         }
 111         if (n->nlmsg_type == RTM_NEWPREFIX) {
 112                 if (prefix_banner)
 113                         fprintf(fp, "[PREFIX]");
 114                 print_prefix(who, n, arg);
 115                 return 0;
 116         }
 117         if (n->nlmsg_type == RTM_NEWRULE || n->nlmsg_type == RTM_DELRULE) {
 118                 if (prefix_banner)
 119                         fprintf(fp, "[RULE]");
 120                 print_rule(who, n, arg);
 121                 return 0;
 122         }
 123         if (n->nlmsg_type == RTM_NEWNETCONF) {
 124                 if (prefix_banner)
 125                         fprintf(fp, "[NETCONF]");
 126                 print_netconf(who, ctrl, n, arg);
 127                 return 0;
 128         }
 129         if (n->nlmsg_type == NLMSG_TSTAMP) {
 130                 print_nlmsg_timestamp(fp, n);
 131                 return 0;
 132         }
 133         if (n->nlmsg_type == RTM_NEWNSID || n->nlmsg_type == RTM_DELNSID) {
 134                 if (prefix_banner)
 135                         fprintf(fp, "[NSID]");
 136                 print_nsid(who, n, arg);
 137                 return 0;
 138         }
 139         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
 140             n->nlmsg_type != NLMSG_DONE) {
 141                 fprintf(fp, "Unknown message: type=0x%08x(%d) flags=0x%08x(%d)"
 142                         "len=0x%08x(%d)\n", n->nlmsg_type, n->nlmsg_type,
 143                         n->nlmsg_flags, n->nlmsg_flags, n->nlmsg_len,
 144                         n->nlmsg_len);
 145         }
 146         return 0;
 147 }
 148
 149 int do_ipmonitor(int argc, char **argv)
 150 {
 151         char *file = NULL;
 152         unsigned groups = 0;
 153         int llink=0;
 154         int laddr=0;
 155         int lroute=0;
 156         int lmroute=0;
 157         int lprefix=0;
 158         int lneigh=0;
 159         int lnetconf=0;
 160         int lrule=0;
 161         int lnsid=0;
 162         int ifindex=0;
 163
 164         groups |= nl_mgrp(RTNLGRP_LINK);
 165         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 166         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 167         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 168         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 169         groups |= nl_mgrp(RTNLGRP_MPLS_ROUTE);
 170         groups |= nl_mgrp(RTNLGRP_IPV4_MROUTE);
 171         groups |= nl_mgrp(RTNLGRP_IPV6_MROUTE);
 172         groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 173         groups |= nl_mgrp(RTNLGRP_NEIGH);
 174         groups |= nl_mgrp(RTNLGRP_IPV4_NETCONF);
 175         groups |= nl_mgrp(RTNLGRP_IPV6_NETCONF);
 176         groups |= nl_mgrp(RTNLGRP_IPV4_RULE);
 177         groups |= nl_mgrp(RTNLGRP_IPV6_RULE);
 178         groups |= nl_mgrp(RTNLGRP_NSID);
 179
 180         rtnl_close(&rth);
 181
 182         while (argc > 0) {
 183                 if (matches(*argv, "file") == 0) {
 184                         NEXT_ARG();
 185                         file = *argv;
 186                 } else if (matches(*argv, "label") == 0) {
 187                         prefix_banner = 1;
 188                 } else if (matches(*argv, "link") == 0) {
 189                         llink=1;
 190                         groups = 0;
 191                 } else if (matches(*argv, "address") == 0) {
 192                         laddr=1;
 193                         groups = 0;
 194                 } else if (matches(*argv, "route") == 0) {
 195                         lroute=1;
 196                         groups = 0;
 197                 } else if (matches(*argv, "mroute") == 0) {
 198                         lmroute=1;
 199                         groups = 0;
 200                 } else if (matches(*argv, "prefix") == 0) {
 201                         lprefix=1;
 202                         groups = 0;
 203                 } else if (matches(*argv, "neigh") == 0) {
 204                         lneigh = 1;
 205                         groups = 0;
 206                 } else if (matches(*argv, "netconf") == 0) {
 207                         lnetconf = 1;
 208                         groups = 0;
 209                 } else if (matches(*argv, "rule") == 0) {
 210                         lrule = 1;
 211                         groups = 0;
 212                 } else if (matches(*argv, "nsid") == 0) {
 213                         lnsid = 1;
 214                         groups = 0;
 215                 } else if (strcmp(*argv, "all") == 0) {
 216                         prefix_banner=1;
 217                 } else if (matches(*argv, "help") == 0) {
 218                         usage();
 219                 } else if (strcmp(*argv, "dev") == 0) {
 220                         NEXT_ARG();
 221
 222                         ifindex = ll_name_to_index(*argv);
 223                         if (!ifindex)
 224                                 invarg("Device does not exist\n", *argv);
 225                 } else {
 226                         fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 227                         exit(-1);
 228                 }
 229                 argc--; argv++;
 230         }
 231
 232         ipaddr_reset_filter(1, ifindex);
 233         iproute_reset_filter(ifindex);
 234         ipmroute_reset_filter(ifindex);
 235         ipneigh_reset_filter(ifindex);
 236         ipnetconf_reset_filter(ifindex);
 237
 238         if (llink)
 239                 groups |= nl_mgrp(RTNLGRP_LINK);
 240         if (laddr) {
 241                 if (!preferred_family || preferred_family == AF_INET)
 242                         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 243                 if (!preferred_family || preferred_family == AF_INET6)
 244                         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 245         }
 246         if (lroute) {
 247                 if (!preferred_family || preferred_family == AF_INET)
 248                         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 249                 if (!preferred_family || preferred_family == AF_INET6)
 250                         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 251                 if (!preferred_family || preferred_family == AF_MPLS)
 252                         groups |= nl_mgrp(RTNLGRP_MPLS_ROUTE);
 253         }
 254         if (lmroute) {
 255                 if (!preferred_family || preferred_family == AF_INET)
 256                         groups |= nl_mgrp(RTNLGRP_IPV4_MROUTE);
 257                 if (!preferred_family || preferred_family == AF_INET6)
 258                         groups |= nl_mgrp(RTNLGRP_IPV6_MROUTE);
 259         }
 260         if (lprefix) {
 261                 if (!preferred_family || preferred_family == AF_INET6)
 262                         groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 263         }
 264         if (lneigh) {
 265                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 266         }
 267         if (lnetconf) {
 268                 if (!preferred_family || preferred_family == AF_INET)
 269                         groups |= nl_mgrp(RTNLGRP_IPV4_NETCONF);
 270                 if (!preferred_family || preferred_family == AF_INET6)
 271                         groups |= nl_mgrp(RTNLGRP_IPV6_NETCONF);
 272         }
 273         if (lrule) {
 274                 if (!preferred_family || preferred_family == AF_INET)
 275                         groups |= nl_mgrp(RTNLGRP_IPV4_RULE);
 276                 if (!preferred_family || preferred_family == AF_INET6)
 277                         groups |= nl_mgrp(RTNLGRP_IPV6_RULE);
 278         }
 279         if (lnsid) {
 280                 groups |= nl_mgrp(RTNLGRP_NSID);
 281         }
 282         if (file) {
 283                 FILE *fp;
 284                 fp = fopen(file, "r");
 285                 if (fp == NULL) {
 286                         perror("Cannot fopen");
 287                         exit(-1);
 288                 }
 289                 return rtnl_from_file(fp, accept_msg, stdout);
 290         }
 291
 292         if (rtnl_open(&rth, groups) < 0)
 293                 exit(1);
 294         ll_init_map(&rth);
 295         netns_map_init();
 296
 297         if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 298                 exit(2);
 299
 300         return 0;
 301 }