ip/ip.c

   1 /*
   2  * ip.c         "ip" utility frontend.
   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 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <syslog.h>
  16 #include <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <string.h>
  20 #include <errno.h>
  21
  22 #include "SNAPSHOT.h"
  23 #include "utils.h"
  24 #include "ip_common.h"
  25
  26 int preferred_family = AF_UNSPEC;
  27 int show_stats = 0;
  28 int show_details = 0;
  29 int resolve_hosts = 0;
  30 int oneline = 0;
  31 int timestamp = 0;
  32 char * _SL_ = NULL;
  33 char *batch_file = NULL;
  34 int force = 0;
  35 int max_flush_loops = 10;
  36
  37 struct rtnl_handle rth = { .fd = -1 };
  38
  39 static void usage(void) __attribute__((noreturn));
  40
  41 static void usage(void)
  42 {
  43         fprintf(stderr,
  44 "Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
  45 "       ip [ -force ] -batch filename\n"
  46 "where  OBJECT := { link | addr | addrlabel | route | rule | neigh | ntable |\n"
  47 "                   tunnel | tuntap | maddr | mroute | mrule | monitor | xfrm }\n"
  48 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
  49 "                    -f[amily] { inet | inet6 | ipx | dnet | link } |\n"
  50 "                    -l[oops] { maximum-addr-flush-attempts } |\n"
  51 "                    -o[neline] | -t[imestamp] | -b[atch] [filename] |\n"
  52 "                    -rc[vbuf] [size]}\n");
  53         exit(-1);
  54 }
  55
  56 static int do_help(int argc, char **argv)
  57 {
  58         usage();
  59 }
  60
  61 static const struct cmd {
  62         const char *cmd;
  63         int (*func)(int argc, char **argv);
  64 } cmds[] = {
  65         { "address",    do_ipaddr },
  66         { "addrlabel",  do_ipaddrlabel },
  67         { "maddress",   do_multiaddr },
  68         { "route",      do_iproute },
  69         { "rule",       do_iprule },
  70         { "neighbor",   do_ipneigh },
  71         { "neighbour",  do_ipneigh },
  72         { "ntable",     do_ipntable },
  73         { "ntbl",       do_ipntable },
  74         { "link",       do_iplink },
  75         { "tunnel",     do_iptunnel },
  76         { "tunl",       do_iptunnel },
  77         { "tuntap",     do_iptuntap },
  78         { "tap",        do_iptuntap },
  79         { "monitor",    do_ipmonitor },
  80         { "xfrm",       do_xfrm },
  81         { "mroute",     do_multiroute },
  82         { "mrule",      do_multirule },
  83         { "help",       do_help },
  84         { 0 }
  85 };
  86
  87 static int do_cmd(const char *argv0, int argc, char **argv)
  88 {
  89         const struct cmd *c;
  90
  91         for (c = cmds; c->cmd; ++c) {
  92                 if (matches(argv0, c->cmd) == 0)
  93                         return c->func(argc-1, argv+1);
  94         }
  95
  96         fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
  97         return -1;
  98 }
  99
 100 static int batch(const char *name)
 101 {
 102         char *line = NULL;
 103         size_t len = 0;
 104         int ret = 0;
 105
 106         if (name && strcmp(name, "-") != 0) {
 107                 if (freopen(name, "r", stdin) == NULL) {
 108                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s\n",
 109                                 name, strerror(errno));
 110                         return -1;
 111                 }
 112         }
 113
 114         if (rtnl_open(&rth, 0) < 0) {
 115                 fprintf(stderr, "Cannot open rtnetlink\n");
 116                 return -1;
 117         }
 118
 119         cmdlineno = 0;
 120         while (getcmdline(&line, &len, stdin) != -1) {
 121                 char *largv[100];
 122                 int largc;
 123
 124                 largc = makeargs(line, largv, 100);
 125                 if (largc == 0)
 126                         continue;       /* blank line */
 127
 128                 if (do_cmd(largv[0], largc, largv)) {
 129                         fprintf(stderr, "Command failed %s:%d\n", name, cmdlineno);
 130                         ret = 1;
 131                         if (!force)
 132                                 break;
 133                 }
 134         }
 135         if (line)
 136                 free(line);
 137
 138         rtnl_close(&rth);
 139         return ret;
 140 }
 141
 142
 143 int main(int argc, char **argv)
 144 {
 145         char *basename;
 146
 147         basename = strrchr(argv[0], '/');
 148         if (basename == NULL)
 149                 basename = argv[0];
 150         else
 151                 basename++;
 152
 153         while (argc > 1) {
 154                 char *opt = argv[1];
 155                 if (strcmp(opt,"--") == 0) {
 156                         argc--; argv++;
 157                         break;
 158                 }
 159                 if (opt[0] != '-')
 160                         break;
 161                 if (opt[1] == '-')
 162                         opt++;
 163                 if (matches(opt, "-loops") == 0) {
 164                         argc--;
 165                         argv++;
 166                         if (argc <= 1)
 167                                 usage();
 168                         max_flush_loops = atoi(argv[1]);
 169                 } else if (matches(opt, "-family") == 0) {
 170                         argc--;
 171                         argv++;
 172                         if (argc <= 1)
 173                                 usage();
 174                         if (strcmp(argv[1], "inet") == 0)
 175                                 preferred_family = AF_INET;
 176                         else if (strcmp(argv[1], "inet6") == 0)
 177                                 preferred_family = AF_INET6;
 178                         else if (strcmp(argv[1], "dnet") == 0)
 179                                 preferred_family = AF_DECnet;
 180                         else if (strcmp(argv[1], "link") == 0)
 181                                 preferred_family = AF_PACKET;
 182                         else if (strcmp(argv[1], "ipx") == 0)
 183                                 preferred_family = AF_IPX;
 184                         else if (strcmp(argv[1], "help") == 0)
 185                                 usage();
 186                         else
 187                                 invarg(argv[1], "invalid protocol family");
 188                 } else if (strcmp(opt, "-4") == 0) {
 189                         preferred_family = AF_INET;
 190                 } else if (strcmp(opt, "-6") == 0) {
 191                         preferred_family = AF_INET6;
 192                 } else if (strcmp(opt, "-0") == 0) {
 193                         preferred_family = AF_PACKET;
 194                 } else if (strcmp(opt, "-I") == 0) {
 195                         preferred_family = AF_IPX;
 196                 } else if (strcmp(opt, "-D") == 0) {
 197                         preferred_family = AF_DECnet;
 198                 } else if (matches(opt, "-stats") == 0 ||
 199                            matches(opt, "-statistics") == 0) {
 200                         ++show_stats;
 201                 } else if (matches(opt, "-details") == 0) {
 202                         ++show_details;
 203                 } else if (matches(opt, "-resolve") == 0) {
 204                         ++resolve_hosts;
 205                 } else if (matches(opt, "-oneline") == 0) {
 206                         ++oneline;
 207                 } else if (matches(opt, "-timestamp") == 0) {
 208                         ++timestamp;
 209 #if 0
 210                 } else if (matches(opt, "-numeric") == 0) {
 211                         rtnl_names_numeric++;
 212 #endif
 213                 } else if (matches(opt, "-Version") == 0) {
 214                         printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
 215                         exit(0);
 216                 } else if (matches(opt, "-force") == 0) {
 217                         ++force;
 218                 } else if (matches(opt, "-batch") == 0) {
 219                         argc--;
 220                         argv++;
 221                         if (argc <= 1)
 222                                 usage();
 223                         batch_file = argv[1];
 224                 } else if (matches(opt, "-rcvbuf") == 0) {
 225                         unsigned int size;
 226
 227                         argc--;
 228                         argv++;
 229                         if (argc <= 1)
 230                                 usage();
 231                         if (get_unsigned(&size, argv[1], 0)) {
 232                                 fprintf(stderr, "Invalid rcvbuf size '%s'\n",
 233                                         argv[1]);
 234                                 exit(-1);
 235                         }
 236                         rcvbuf = size;
 237                 } else if (matches(opt, "-help") == 0) {
 238                         usage();
 239                 } else {
 240                         fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
 241                         exit(-1);
 242                 }
 243                 argc--; argv++;
 244         }
 245
 246         _SL_ = oneline ? "\\" : "\n" ;
 247
 248         if (batch_file)
 249                 return batch(batch_file);
 250
 251         if (rtnl_open(&rth, 0) < 0)
 252                 exit(1);
 253
 254         if (strlen(basename) > 2)
 255                 return do_cmd(basename+2, argc, argv);
 256
 257         if (argc > 1)
 258                 return do_cmd(argv[1], argc-1, argv+1);
 259
 260         rtnl_close(&rth);
 261         usage();
 262 }