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 int listen_all_nsid;
  30
  31 static void usage(void)
  32 {
  33         fprintf(stderr, "Usage: ip monitor [ all | LISTofOBJECTS ] [ FILE ] "
  34                         "[ label ] [all-nsid] [dev DEVICE]\n");
  35         fprintf(stderr, "LISTofOBJECTS := link | address | route | mroute | prefix |\n");
  36         fprintf(stderr, "                 neigh | netconf | rule | nsid\n");
  37         fprintf(stderr, "FILE := file FILENAME\n");
  38         exit(-1);
  39 }
  40
  41 static void print_headers(FILE *fp, char *label, struct rtnl_ctrl_data *ctrl)
  42 {
  43         if (timestamp)
  44                 print_timestamp(fp);
  45
  46         if (listen_all_nsid) {
  47                 if (ctrl == NULL || ctrl->nsid < 0)
  48                         fprintf(fp, "[nsid current]");
  49                 else
  50                         fprintf(fp, "[nsid %d]", ctrl->nsid);
  51         }
  52
  53         if (prefix_banner)
  54                 fprintf(fp, "%s", label);
  55 }
  56
  57 static int accept_msg(const struct sockaddr_nl *who,
  58                       struct rtnl_ctrl_data *ctrl,
  59                       struct nlmsghdr *n, void *arg)
  60 {
  61         FILE *fp = (FILE*)arg;
  62
  63         if (n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) {
  64                 struct rtmsg *r = NLMSG_DATA(n);
  65                 int len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
  66
  67                 if (len < 0) {
  68                         fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  69                         return -1;
  70                 }
  71
  72                 if (r->rtm_flags & RTM_F_CLONED)
  73                         return 0;
  74
  75                 if (r->rtm_family == RTNL_FAMILY_IPMR ||
  76                     r->rtm_family == RTNL_FAMILY_IP6MR) {
  77                         print_headers(fp, "[MROUTE]", ctrl);
  78                         print_mroute(who, n, arg);
  79                         return 0;
  80                 } else {
  81                         print_headers(fp, "[ROUTE]", ctrl);
  82                         print_route(who, n, arg);
  83                         return 0;
  84                 }
  85         }
  86
  87         if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
  88                 ll_remember_index(who, n, NULL);
  89                 print_headers(fp, "[LINK]", ctrl);
  90                 print_linkinfo(who, n, arg);
  91                 return 0;
  92         }
  93         if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
  94                 print_headers(fp, "[ADDR]", ctrl);
  95                 print_addrinfo(who, n, arg);
  96                 return 0;
  97         }
  98         if (n->nlmsg_type == RTM_NEWADDRLABEL || n->nlmsg_type == RTM_DELADDRLABEL) {
  99                 print_headers(fp, "[ADDRLABEL]", ctrl);
 100                 print_addrlabel(who, n, arg);
 101                 return 0;
 102         }
 103         if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH ||
 104             n->nlmsg_type == RTM_GETNEIGH) {
 105                 if (preferred_family) {
 106                         struct ndmsg *r = NLMSG_DATA(n);
 107
 108                         if (r->ndm_family != preferred_family)
 109                                 return 0;
 110                 }
 111
 112                 print_headers(fp, "[NEIGH]", ctrl);
 113                 print_neigh(who, n, arg);
 114                 return 0;
 115         }
 116         if (n->nlmsg_type == RTM_NEWPREFIX) {
 117                 print_headers(fp, "[PREFIX]", ctrl);
 118                 print_prefix(who, n, arg);
 119                 return 0;
 120         }
 121         if (n->nlmsg_type == RTM_NEWRULE || n->nlmsg_type == RTM_DELRULE) {
 122                 print_headers(fp, "[RULE]", ctrl);
 123                 print_rule(who, n, arg);
 124                 return 0;
 125         }
 126         if (n->nlmsg_type == RTM_NEWNETCONF) {
 127                 print_headers(fp, "[NETCONF]", ctrl);
 128                 print_netconf(who, ctrl, n, arg);
 129                 return 0;
 130         }
 131         if (n->nlmsg_type == NLMSG_TSTAMP) {
 132                 print_nlmsg_timestamp(fp, n);
 133                 return 0;
 134         }
 135         if (n->nlmsg_type == RTM_NEWNSID || n->nlmsg_type == RTM_DELNSID) {
 136                 print_headers(fp, "[NSID]", ctrl);
 137                 print_nsid(who, n, arg);
 138                 return 0;
 139         }
 140         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
 141             n->nlmsg_type != NLMSG_DONE) {
 142                 fprintf(fp, "Unknown message: type=0x%08x(%d) flags=0x%08x(%d)"
 143                         "len=0x%08x(%d)\n", n->nlmsg_type, n->nlmsg_type,
 144                         n->nlmsg_flags, n->nlmsg_flags, n->nlmsg_len,
 145                         n->nlmsg_len);
 146         }
 147         return 0;
 148 }
 149
 150 int do_ipmonitor(int argc, char **argv)
 151 {
 152         char *file = NULL;
 153         unsigned groups = 0;
 154         int llink=0;
 155         int laddr=0;
 156         int lroute=0;
 157         int lmroute=0;
 158         int lprefix=0;
 159         int lneigh=0;
 160         int lnetconf=0;
 161         int lrule=0;
 162         int lnsid=0;
 163         int ifindex=0;
 164
 165         groups |= nl_mgrp(RTNLGRP_LINK);
 166         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 167         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 168         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 169         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 170         groups |= nl_mgrp(RTNLGRP_MPLS_ROUTE);
 171         groups |= nl_mgrp(RTNLGRP_IPV4_MROUTE);
 172         groups |= nl_mgrp(RTNLGRP_IPV6_MROUTE);
 173         groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 174         groups |= nl_mgrp(RTNLGRP_NEIGH);
 175         groups |= nl_mgrp(RTNLGRP_IPV4_NETCONF);
 176         groups |= nl_mgrp(RTNLGRP_IPV6_NETCONF);
 177         groups |= nl_mgrp(RTNLGRP_IPV4_RULE);
 178         groups |= nl_mgrp(RTNLGRP_IPV6_RULE);
 179         groups |= nl_mgrp(RTNLGRP_NSID);
 180
 181         rtnl_close(&rth);
 182
 183         while (argc > 0) {
 184                 if (matches(*argv, "file") == 0) {
 185                         NEXT_ARG();
 186                         file = *argv;
 187                 } else if (matches(*argv, "label") == 0) {
 188                         prefix_banner = 1;
 189                 } else if (matches(*argv, "all-nsid") == 0) {
 190                         listen_all_nsid = 1;
 191                 } else if (matches(*argv, "link") == 0) {
 192                         llink=1;
 193                         groups = 0;
 194                 } else if (matches(*argv, "address") == 0) {
 195                         laddr=1;
 196                         groups = 0;
 197                 } else if (matches(*argv, "route") == 0) {
 198                         lroute=1;
 199                         groups = 0;
 200                 } else if (matches(*argv, "mroute") == 0) {
 201                         lmroute=1;
 202                         groups = 0;
 203                 } else if (matches(*argv, "prefix") == 0) {
 204                         lprefix=1;
 205                         groups = 0;
 206                 } else if (matches(*argv, "neigh") == 0) {
 207                         lneigh = 1;
 208                         groups = 0;
 209                 } else if (matches(*argv, "netconf") == 0) {
 210                         lnetconf = 1;
 211                         groups = 0;
 212                 } else if (matches(*argv, "rule") == 0) {
 213                         lrule = 1;
 214                         groups = 0;
 215                 } else if (matches(*argv, "nsid") == 0) {
 216                         lnsid = 1;
 217                         groups = 0;
 218                 } else if (strcmp(*argv, "all") == 0) {
 219                         prefix_banner=1;
 220                 } else if (matches(*argv, "help") == 0) {
 221                         usage();
 222                 } else if (strcmp(*argv, "dev") == 0) {
 223                         NEXT_ARG();
 224
 225                         ifindex = ll_name_to_index(*argv);
 226                         if (!ifindex)
 227                                 invarg("Device does not exist\n", *argv);
 228                 } else {
 229                         fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 230                         exit(-1);
 231                 }
 232                 argc--; argv++;
 233         }
 234
 235         ipaddr_reset_filter(1, ifindex);
 236         iproute_reset_filter(ifindex);
 237         ipmroute_reset_filter(ifindex);
 238         ipneigh_reset_filter(ifindex);
 239         ipnetconf_reset_filter(ifindex);
 240
 241         if (llink)
 242                 groups |= nl_mgrp(RTNLGRP_LINK);
 243         if (laddr) {
 244                 if (!preferred_family || preferred_family == AF_INET)
 245                         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 246                 if (!preferred_family || preferred_family == AF_INET6)
 247                         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 248         }
 249         if (lroute) {
 250                 if (!preferred_family || preferred_family == AF_INET)
 251                         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 252                 if (!preferred_family || preferred_family == AF_INET6)
 253                         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 254                 if (!preferred_family || preferred_family == AF_MPLS)
 255                         groups |= nl_mgrp(RTNLGRP_MPLS_ROUTE);
 256         }
 257         if (lmroute) {
 258                 if (!preferred_family || preferred_family == AF_INET)
 259                         groups |= nl_mgrp(RTNLGRP_IPV4_MROUTE);
 260                 if (!preferred_family || preferred_family == AF_INET6)
 261                         groups |= nl_mgrp(RTNLGRP_IPV6_MROUTE);
 262         }
 263         if (lprefix) {
 264                 if (!preferred_family || preferred_family == AF_INET6)
 265                         groups |= nl_mgrp(RTNLGRP_IPV6_PREFIX);
 266         }
 267         if (lneigh) {
 268                 groups |= nl_mgrp(RTNLGRP_NEIGH);
 269         }
 270         if (lnetconf) {
 271                 if (!preferred_family || preferred_family == AF_INET)
 272                         groups |= nl_mgrp(RTNLGRP_IPV4_NETCONF);
 273                 if (!preferred_family || preferred_family == AF_INET6)
 274                         groups |= nl_mgrp(RTNLGRP_IPV6_NETCONF);
 275         }
 276         if (lrule) {
 277                 if (!preferred_family || preferred_family == AF_INET)
 278                         groups |= nl_mgrp(RTNLGRP_IPV4_RULE);
 279                 if (!preferred_family || preferred_family == AF_INET6)
 280                         groups |= nl_mgrp(RTNLGRP_IPV6_RULE);
 281         }
 282         if (lnsid) {
 283                 groups |= nl_mgrp(RTNLGRP_NSID);
 284         }
 285         if (file) {
 286                 FILE *fp;
 287                 fp = fopen(file, "r");
 288                 if (fp == NULL) {
 289                         perror("Cannot fopen");
 290                         exit(-1);
 291                 }
 292                 return rtnl_from_file(fp, accept_msg, stdout);
 293         }
 294
 295         if (rtnl_open(&rth, groups) < 0)
 296                 exit(1);
 297         if (listen_all_nsid && rtnl_listen_all_nsid(&rth) < 0)
 298                 exit(1);
 299
 300         ll_init_map(&rth);
 301         netns_map_init();
 302
 303         if (rtnl_listen(&rth, accept_msg, stdout) < 0)
 304                 exit(2);
 305
 306         return 0;
 307 }