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 "                   netns | l2tp }\n"
  49 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
  50 "                    -f[amily] { inet | inet6 | ipx | dnet | link } |\n"
  51 "                    -l[oops] { maximum-addr-flush-attempts } |\n"
  52 "                    -o[neline] | -t[imestamp] | -b[atch] [filename] |\n"
  53 "                    -rc[vbuf] [size]}\n");
  54         exit(-1);
  55 }
  56
  57 static int do_help(int argc, char **argv)
  58 {
  59         usage();
  60 }
  61
  62 static const struct cmd {
  63         const char *cmd;
  64         int (*func)(int argc, char **argv);
  65 } cmds[] = {
  66         { "address",    do_ipaddr },
  67         { "addrlabel",  do_ipaddrlabel },
  68         { "maddress",   do_multiaddr },
  69         { "route",      do_iproute },
  70         { "rule",       do_iprule },
  71         { "neighbor",   do_ipneigh },
  72         { "neighbour",  do_ipneigh },
  73         { "ntable",     do_ipntable },
  74         { "ntbl",       do_ipntable },
  75         { "link",       do_iplink },
  76         { "l2tp",       do_ipl2tp },
  77         { "tunnel",     do_iptunnel },
  78         { "tunl",       do_iptunnel },
  79         { "tuntap",     do_iptuntap },
  80         { "tap",        do_iptuntap },
  81         { "monitor",    do_ipmonitor },
  82         { "xfrm",       do_xfrm },
  83         { "mroute",     do_multiroute },
  84         { "mrule",      do_multirule },
  85         { "netns",      do_netns },
  86         { "help",       do_help },
  87         { 0 }
  88 };
  89
  90 static int do_cmd(const char *argv0, int argc, char **argv)
  91 {
  92         const struct cmd *c;
  93
  94         for (c = cmds; c->cmd; ++c) {
  95                 if (matches(argv0, c->cmd) == 0) {
  96                         return -(c->func(argc-1, argv+1));
  97                 }
  98         }
  99
 100         fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
 101         return EXIT_FAILURE;
 102 }
 103
 104 static int batch(const char *name)
 105 {
 106         char *line = NULL;
 107         size_t len = 0;
 108         int ret = EXIT_SUCCESS;
 109
 110         if (name && strcmp(name, "-") != 0) {
 111                 if (freopen(name, "r", stdin) == NULL) {
 112                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s\n",
 113                                 name, strerror(errno));
 114                         return EXIT_FAILURE;
 115                 }
 116         }
 117
 118         if (rtnl_open(&rth, 0) < 0) {
 119                 fprintf(stderr, "Cannot open rtnetlink\n");
 120                 return EXIT_FAILURE;
 121         }
 122
 123         cmdlineno = 0;
 124         while (getcmdline(&line, &len, stdin) != -1) {
 125                 char *largv[100];
 126                 int largc;
 127
 128                 largc = makeargs(line, largv, 100);
 129                 if (largc == 0)
 130                         continue;       /* blank line */
 131
 132                 if (do_cmd(largv[0], largc, largv)) {
 133                         fprintf(stderr, "Command failed %s:%d\n", name, cmdlineno);
 134                         ret = EXIT_FAILURE;
 135                         if (!force)
 136                                 break;
 137                 }
 138         }
 139         if (line)
 140                 free(line);
 141
 142         rtnl_close(&rth);
 143         return ret;
 144 }
 145
 146
 147 int main(int argc, char **argv)
 148 {
 149         char *basename;
 150
 151         basename = strrchr(argv[0], '/');
 152         if (basename == NULL)
 153                 basename = argv[0];
 154         else
 155                 basename++;
 156
 157         while (argc > 1) {
 158                 char *opt = argv[1];
 159                 if (strcmp(opt,"--") == 0) {
 160                         argc--; argv++;
 161                         break;
 162                 }
 163                 if (opt[0] != '-')
 164                         break;
 165                 if (opt[1] == '-')
 166                         opt++;
 167                 if (matches(opt, "-loops") == 0) {
 168                         argc--;
 169                         argv++;
 170                         if (argc <= 1)
 171                                 usage();
 172                         max_flush_loops = atoi(argv[1]);
 173                 } else if (matches(opt, "-family") == 0) {
 174                         argc--;
 175                         argv++;
 176                         if (argc <= 1)
 177                                 usage();
 178                         if (strcmp(argv[1], "inet") == 0)
 179                                 preferred_family = AF_INET;
 180                         else if (strcmp(argv[1], "inet6") == 0)
 181                                 preferred_family = AF_INET6;
 182                         else if (strcmp(argv[1], "dnet") == 0)
 183                                 preferred_family = AF_DECnet;
 184                         else if (strcmp(argv[1], "link") == 0)
 185                                 preferred_family = AF_PACKET;
 186                         else if (strcmp(argv[1], "ipx") == 0)
 187                                 preferred_family = AF_IPX;
 188                         else if (strcmp(argv[1], "help") == 0)
 189                                 usage();
 190                         else
 191                                 invarg(argv[1], "invalid protocol family");
 192                 } else if (strcmp(opt, "-4") == 0) {
 193                         preferred_family = AF_INET;
 194                 } else if (strcmp(opt, "-6") == 0) {
 195                         preferred_family = AF_INET6;
 196                 } else if (strcmp(opt, "-0") == 0) {
 197                         preferred_family = AF_PACKET;
 198                 } else if (strcmp(opt, "-I") == 0) {
 199                         preferred_family = AF_IPX;
 200                 } else if (strcmp(opt, "-D") == 0) {
 201                         preferred_family = AF_DECnet;
 202                 } else if (matches(opt, "-stats") == 0 ||
 203                            matches(opt, "-statistics") == 0) {
 204                         ++show_stats;
 205                 } else if (matches(opt, "-details") == 0) {
 206                         ++show_details;
 207                 } else if (matches(opt, "-resolve") == 0) {
 208                         ++resolve_hosts;
 209                 } else if (matches(opt, "-oneline") == 0) {
 210                         ++oneline;
 211                 } else if (matches(opt, "-timestamp") == 0) {
 212                         ++timestamp;
 213 #if 0
 214                 } else if (matches(opt, "-numeric") == 0) {
 215                         rtnl_names_numeric++;
 216 #endif
 217                 } else if (matches(opt, "-Version") == 0) {
 218                         printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
 219                         exit(0);
 220                 } else if (matches(opt, "-force") == 0) {
 221                         ++force;
 222                 } else if (matches(opt, "-batch") == 0) {
 223                         argc--;
 224                         argv++;
 225                         if (argc <= 1)
 226                                 usage();
 227                         batch_file = argv[1];
 228                 } else if (matches(opt, "-rcvbuf") == 0) {
 229                         unsigned int size;
 230
 231                         argc--;
 232                         argv++;
 233                         if (argc <= 1)
 234                                 usage();
 235                         if (get_unsigned(&size, argv[1], 0)) {
 236                                 fprintf(stderr, "Invalid rcvbuf size '%s'\n",
 237                                         argv[1]);
 238                                 exit(-1);
 239                         }
 240                         rcvbuf = size;
 241                 } else if (matches(opt, "-help") == 0) {
 242                         usage();
 243                 } else {
 244                         fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
 245                         exit(-1);
 246                 }
 247                 argc--; argv++;
 248         }
 249
 250         _SL_ = oneline ? "\\" : "\n" ;
 251
 252         if (batch_file)
 253                 return batch(batch_file);
 254
 255         if (rtnl_open(&rth, 0) < 0)
 256                 exit(1);
 257
 258         if (strlen(basename) > 2)
 259                 return do_cmd(basename+2, argc, argv);
 260
 261         if (argc > 1)
 262                 return do_cmd(argv[1], argc-1, argv+1);
 263
 264         rtnl_close(&rth);
 265         usage();
 266 }