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
  29 static void usage(void)
  30 {
  31         fprintf(stderr, "Usage: ip monitor [ all | LISTofOBJECTS ]\n");
  32         exit(-1);
  33 }
  34
  35
  36 int accept_msg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  37 {
  38         FILE *fp = (FILE*)arg;
  39
  40         if (n->nlmsg_type == RTM_NEWROUTE || n->nlmsg_type == RTM_DELROUTE) {
  41                 print_route(who, n, arg);
  42                 return 0;
  43         }
  44         if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
  45                 ll_remember_index(who, n, NULL);
  46                 print_linkinfo(who, n, arg);
  47                 return 0;
  48         }
  49         if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
  50                 print_addrinfo(who, n, arg);
  51                 return 0;
  52         }
  53         if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH) {
  54                 print_neigh(who, n, arg);
  55                 return 0;
  56         }
  57         if (n->nlmsg_type == 15) {
  58                 char *tstr;
  59                 time_t secs = ((__u32*)NLMSG_DATA(n))[0];
  60                 long usecs = ((__u32*)NLMSG_DATA(n))[1];
  61                 tstr = asctime(localtime(&secs));
  62                 tstr[strlen(tstr)-1] = 0;
  63                 fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
  64                 return 0;
  65         }
  66         if (n->nlmsg_type == RTM_NEWQDISC ||
  67             n->nlmsg_type == RTM_DELQDISC ||
  68             n->nlmsg_type == RTM_NEWTCLASS ||
  69             n->nlmsg_type == RTM_DELTCLASS ||
  70             n->nlmsg_type == RTM_NEWTFILTER ||
  71             n->nlmsg_type == RTM_DELTFILTER)
  72                 return 0;
  73         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
  74             n->nlmsg_type != NLMSG_DONE) {
  75                 fprintf(fp, "Unknown message: %08x %08x %08x\n",
  76                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  77         }
  78         return 0;
  79 }
  80
  81 int do_ipmonitor(int argc, char **argv)
  82 {
  83         struct rtnl_handle rth;
  84         char *file = NULL;
  85         unsigned groups = ~RTMGRP_TC;
  86         int llink=0;
  87         int laddr=0;
  88         int lroute=0;
  89
  90         ipaddr_reset_filter(1);
  91         iproute_reset_filter();
  92         ipneigh_reset_filter();
  93
  94         while (argc > 0) {
  95                 if (matches(*argv, "file") == 0) {
  96                         NEXT_ARG();
  97                         file = *argv;
  98                 } else if (matches(*argv, "link") == 0) {
  99                         llink=1;
 100                         groups = 0;
 101                 } else if (matches(*argv, "address") == 0) {
 102                         laddr=1;
 103                         groups = 0;
 104                 } else if (matches(*argv, "route") == 0) {
 105                         lroute=1;
 106                         groups = 0;
 107                 } else if (strcmp(*argv, "all") == 0) {
 108                         groups = ~RTMGRP_TC;
 109                 } else if (matches(*argv, "help") == 0) {
 110                         usage();
 111                 } else {
 112                         fprintf(stderr, "Argument \"%s\" is unknown, try \"ip monitor help\".\n", *argv);
 113                         exit(-1);
 114                 }
 115                 argc--; argv++;
 116         }
 117
 118         if (llink)
 119                 groups |= RTMGRP_LINK;
 120         if (laddr) {
 121                 if (!preferred_family || preferred_family == AF_INET)
 122                         groups |= RTMGRP_IPV4_IFADDR;
 123                 if (!preferred_family || preferred_family == AF_INET6)
 124                         groups |= RTMGRP_IPV6_IFADDR;
 125         }
 126         if (lroute) {
 127                 if (!preferred_family || preferred_family == AF_INET)
 128                         groups |= RTMGRP_IPV4_ROUTE;
 129                 if (!preferred_family || preferred_family == AF_INET6)
 130                         groups |= RTMGRP_IPV6_ROUTE;
 131         }
 132
 133         if (file) {
 134                 FILE *fp;
 135                 fp = fopen(file, "r");
 136                 if (fp == NULL) {
 137                         perror("Cannot fopen");
 138                         exit(-1);
 139                 }
 140                 return rtnl_from_file(fp, accept_msg, (void*)stdout);
 141         }
 142
 143         if (rtnl_open(&rth, groups) < 0)
 144                 exit(1);
 145
 146         ll_init_map(&rth);
 147
 148         if (rtnl_listen(&rth, accept_msg, (void*)stdout) < 0)
 149                 exit(2);
 150
 151         exit(0);
 152 }