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,
  66                 "Usage: rtmon [ OPTIONS ] file FILE [ all | LISTofOBJECTS ]\n"
  67                 "OPTIONS := { -f[amily] { inet | inet6 | link | help } |\n"
  68                 "            -4 | -6 | -0 | -V[ersion] }\n"
  69                 "LISTofOBJECTS := [ link ] [ address ] [ route ]\n");
  70         exit(-1);
  71 }
  72
  73 int
  74 main(int argc, char **argv)
  75 {
  76         FILE *fp;
  77         struct rtnl_handle rth;
  78         int family = AF_UNSPEC;
  79         unsigned int groups = ~0U;
  80         int llink = 0;
  81         int laddr = 0;
  82         int lroute = 0;
  83         char *file = NULL;
  84
  85         while (argc > 1) {
  86                 if (matches(argv[1], "-family") == 0) {
  87                         argc--;
  88                         argv++;
  89                         if (argc <= 1)
  90                                 usage();
  91                         if (strcmp(argv[1], "inet") == 0)
  92                                 family = AF_INET;
  93                         else if (strcmp(argv[1], "inet6") == 0)
  94                                 family = AF_INET6;
  95                         else if (strcmp(argv[1], "link") == 0)
  96                                 family = AF_INET6;
  97                         else if (strcmp(argv[1], "help") == 0)
  98                                 usage();
  99                         else {
 100                                 fprintf(stderr, "Protocol ID \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
 101                                 exit(-1);
 102                         }
 103                 } else if (strcmp(argv[1], "-4") == 0) {
 104                         family = AF_INET;
 105                 } else if (strcmp(argv[1], "-6") == 0) {
 106                         family = AF_INET6;
 107                 } else if (strcmp(argv[1], "-0") == 0) {
 108                         family = AF_PACKET;
 109                 } else if (matches(argv[1], "-Version") == 0) {
 110                         printf("rtmon utility, iproute2-ss%s\n", SNAPSHOT);
 111                         exit(0);
 112                 } else if (matches(argv[1], "file") == 0) {
 113                         argc--;
 114                         argv++;
 115                         if (argc <= 1)
 116                                 usage();
 117                         file = argv[1];
 118                 } else if (matches(argv[1], "link") == 0) {
 119                         llink = 1;
 120                         groups = 0;
 121                 } else if (matches(argv[1], "address") == 0) {
 122                         laddr = 1;
 123                         groups = 0;
 124                 } else if (matches(argv[1], "route") == 0) {
 125                         lroute = 1;
 126                         groups = 0;
 127                 } else if (strcmp(argv[1], "all") == 0) {
 128                         groups = ~0U;
 129                 } else if (matches(argv[1], "help") == 0) {
 130                         usage();
 131                 } else {
 132                         fprintf(stderr, "Argument \"%s\" is unknown, try \"rtmon help\".\n", argv[1]);
 133                         exit(-1);
 134                 }
 135                 argc--; argv++;
 136         }
 137
 138         if (file == NULL) {
 139                 fprintf(stderr, "Not enough information: argument \"file\" is required\n");
 140                 exit(-1);
 141         }
 142         if (llink)
 143                 groups |= nl_mgrp(RTNLGRP_LINK);
 144         if (laddr) {
 145                 if (!family || family == AF_INET)
 146                         groups |= nl_mgrp(RTNLGRP_IPV4_IFADDR);
 147                 if (!family || family == AF_INET6)
 148                         groups |= nl_mgrp(RTNLGRP_IPV6_IFADDR);
 149         }
 150         if (lroute) {
 151                 if (!family || family == AF_INET)
 152                         groups |= nl_mgrp(RTNLGRP_IPV4_ROUTE);
 153                 if (!family || family == AF_INET6)
 154                         groups |= nl_mgrp(RTNLGRP_IPV6_ROUTE);
 155         }
 156
 157         fp = fopen(file, "w");
 158         if (fp == NULL) {
 159                 perror("Cannot fopen");
 160                 exit(-1);
 161         }
 162
 163         if (rtnl_open(&rth, groups) < 0)
 164                 exit(1);
 165
 166         if (rtnl_linkdump_req(&rth, AF_UNSPEC) < 0) {
 167                 perror("Cannot send dump request");
 168                 exit(1);
 169         }
 170
 171         write_stamp(fp);
 172
 173         if (rtnl_dump_filter(&rth, dump_msg2, fp) < 0) {
 174                 fprintf(stderr, "Dump terminated\n");
 175                 return 1;
 176         }
 177
 178         init_phase = 0;
 179
 180         if (rtnl_listen(&rth, dump_msg, (void *)fp) < 0)
 181                 exit(2);
 182
 183         exit(0);
 184 }