ip/rtmon.c

   1 /*
   2  * rtmon.c              RTnetlink listener.
   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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <sys/time.h>
  19 #include <netinet/in.h>
  20 #include <string.h>
  21
  22 #include "SNAPSHOT.h"
  23
  24 #include "utils.h"
  25 #include "libnetlink.h"
  26
  27 static int init_phase = 1;
  28
  29 static void write_stamp(FILE *fp)
  30 {
  31         char buf[128];
  32         struct nlmsghdr *n1 = (void *)buf;
  33         struct timeval tv;
  34
  35         n1->nlmsg_type = NLMSG_TSTAMP;
  36         n1->nlmsg_flags = 0;
  37         n1->nlmsg_seq = 0;
  38         n1->nlmsg_pid = 0;
  39         n1->nlmsg_len = NLMSG_LENGTH(4*2);
  40         gettimeofday(&tv, NULL);
  41         ((__u32 *)NLMSG_DATA(n1))[0] = tv.tv_sec;
  42         ((__u32 *)NLMSG_DATA(n1))[1] = tv.tv_usec;
  43         fwrite((void *)n1, 1, NLMSG_ALIGN(n1->nlmsg_len), fp);
  44 }
  45
  46 static int dump_msg(struct rtnl_ctrl_data *ctrl,
  47                     struct nlmsghdr *n, void *arg)
  48 {
  49         FILE *fp = (FILE *)arg;
  50
  51         if (!init_phase)
  52                 write_stamp(fp);
  53         fwrite((void *)n, 1, NLMSG_ALIGN(n->nlmsg_len), fp);
  54         fflush(fp);
  55         return 0;
  56 }
  57
  58 static int dump_msg2(struct nlmsghdr *n, void *arg)
  59 {
  60         return dump_msg(NULL, n, arg);
  61 }
  62
  63 static void usage(void)
  64 {
  65         fprintf(stderr, "Usage: rtmon [ OPTIONS ] file FILE [ all | LISTofOBJECTS ]\n");
  66         fprintf(stderr, "OPTIONS := { -f[amily] { inet | inet6 | link | help } |\n"
  67                         "             -4 | -6 | -0 | -V[ersion] }\n");
  68         fprintf(stderr, "LISTofOBJECTS := [ link ] [ address ] [ route ]\n");
  69         exit(-1);
  70 }
  71
  72 int
  73 main(int argc, char **argv)
  74 {
  75         FILE *fp;
  76         struct rtnl_handle rth;
  77         int family = AF_UNSPEC;
  78         unsigned int groups = ~0U;
  79         int llink = 0;
  80         int laddr = 0;
  81         int lroute = 0;
  82         char *file = NULL;
  83
  84         while (argc > 1) {
  85                 if (matches(argv[1], "-family") == 0) {
  86                         argc--;
  87                         argv++;
  88                         if (argc <= 1)
  89                                 usage();
  90                         if (strcmp(argv[1], "inet") == 0)
  91                                 family = AF_INET;
  92                         else if (strcmp(argv[1], "inet6") == 0)
  93                                 family = AF_INET6;
  94                         else if (strcmp(argv[1], "link") == 0)
  95                                 family = AF_INET6;
  96                         else if (strcmp(argv[1], "help") == 0)
  97                                 usage();
  98                         else {
  99                                 fprintf(stderr, "Protocol ID \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
 100                                 exit(-1);
 101                         }
 102                 } else if (strcmp(argv[1], "-4") == 0) {
 103                         family = AF_INET;
 104                 } else if (strcmp(argv[1], "-6") == 0) {
 105                         family = AF_INET6;
 106                 } else if (strcmp(argv[1], "-0") == 0) {
 107                         family = AF_PACKET;
 108                 } else if (matches(argv[1], "-Version") == 0) {
 109                         printf("rtmon utility, iproute2-ss%s\n", SNAPSHOT);
 110                         exit(0);
 111                 } else if (matches(argv[1], "file") == 0) {
 112                         argc--;
 113                         argv++;
 114                         if (argc <= 1)
 115                                 usage();
 116                         file = argv[1];
 117                 } else if (matches(argv[1], "link") == 0) {
 118                         llink = 1;
 119                         groups = 0;
 120                 } else if (matches(argv[1], "address") == 0) {
 121                         laddr = 1;
 122                         groups = 0;
 123                 } else if (matches(argv[1], "route") == 0) {
 124                         lroute = 1;
 125                         groups = 0;
 126                 } else if (strcmp(argv[1], "all") == 0) {
 127                         groups = ~0U;
 128                 } else if (matches(argv[1], "help") == 0) {
 129                         usage();
 130                 } else {
 131                         fprintf(stderr, "Argument \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
 132                         exit(-1);
 133                 }
 134                 argc--; argv++;
 135         }
 136
 137         if (file == NULL) {
 138                 fprintf(stderr, "Not enough information: argument \"file\" is required\n");
 139                 exit(-1);
 140         }
 141         if (llink)
 142                 groups |= nl_mgrp(RTNLGRP_LINK);
 143         if (laddr) {
 144                 if (!family || family == AF_INET)
 145                         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 146                 if (!family || family == AF_INET6)
 147                         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 148         }
 149         if (lroute) {
 150                 if (!family || family == AF_INET)
 151                         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 152                 if (!family || family == AF_INET6)
 153                         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 154         }
 155
 156         fp = fopen(file, "w");
 157         if (fp == NULL) {
 158                 perror("Cannot fopen");
 159                 exit(-1);
 160         }
 161
 162         if (rtnl_open(&rth, groups) < 0)
 163                 exit(1);
 164
 165         if (rtnl_linkdump_req(&rth, AF_UNSPEC) < 0) {
 166                 perror("Cannot send dump request");
 167                 exit(1);
 168         }
 169
 170         write_stamp(fp);
 171
 172         if (rtnl_dump_filter(&rth, dump_msg2, fp) < 0) {
 173                 fprintf(stderr, "Dump terminated\n");
 174                 return 1;
 175         }
 176
 177         init_phase = 0;
 178
 179         if (rtnl_listen(&rth, dump_msg, (void *)fp) < 0)
 180                 exit(2);
 181
 182         exit(0);
 183 }