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 | tcp_metrics }\n"
  49 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
  50 "                    -f[amily] { inet | inet6 | ipx | dnet | bridge | 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         { "tcpmetrics", do_tcp_metrics },
  82         { "tcp_metrics",do_tcp_metrics },
  83         { "monitor",    do_ipmonitor },
  84         { "xfrm",       do_xfrm },
  85         { "mroute",     do_multiroute },
  86         { "mrule",      do_multirule },
  87         { "netns",      do_netns },
  88         { "netconf",    do_ipnetconf },
  89         { "help",       do_help },
  90         { 0 }
  91 };
  92
  93 static int do_cmd(const char *argv0, int argc, char **argv)
  94 {
  95         const struct cmd *c;
  96
  97         for (c = cmds; c->cmd; ++c) {
  98                 if (matches(argv0, c->cmd) == 0) {
  99                         return -(c->func(argc-1, argv+1));
 100                 }
 101         }
 102
 103         fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
 104         return EXIT_FAILURE;
 105 }
 106
 107 static int batch(const char *name)
 108 {
 109         char *line = NULL;
 110         size_t len = 0;
 111         int ret = EXIT_SUCCESS;
 112
 113         if (name && strcmp(name, "-") != 0) {
 114                 if (freopen(name, "r", stdin) == NULL) {
 115                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s\n",
 116                                 name, strerror(errno));
 117                         return EXIT_FAILURE;
 118                 }
 119         }
 120
 121         if (rtnl_open(&rth, 0) < 0) {
 122                 fprintf(stderr, "Cannot open rtnetlink\n");
 123                 return EXIT_FAILURE;
 124         }
 125
 126         cmdlineno = 0;
 127         while (getcmdline(&line, &len, stdin) != -1) {
 128                 char *largv[100];
 129                 int largc;
 130
 131                 largc = makeargs(line, largv, 100);
 132                 if (largc == 0)
 133                         continue;       /* blank line */
 134
 135                 if (do_cmd(largv[0], largc, largv)) {
 136                         fprintf(stderr, "Command failed %s:%d\n", name, cmdlineno);
 137                         ret = EXIT_FAILURE;
 138                         if (!force)
 139                                 break;
 140                 }
 141         }
 142         if (line)
 143                 free(line);
 144
 145         rtnl_close(&rth);
 146         return ret;
 147 }
 148
 149
 150 int main(int argc, char **argv)
 151 {
 152         char *basename;
 153
 154         basename = strrchr(argv[0], '/');
 155         if (basename == NULL)
 156                 basename = argv[0];
 157         else
 158                 basename++;
 159
 160         while (argc > 1) {
 161                 char *opt = argv[1];
 162                 if (strcmp(opt,"--") == 0) {
 163                         argc--; argv++;
 164                         break;
 165                 }
 166                 if (opt[0] != '-')
 167                         break;
 168                 if (opt[1] == '-')
 169                         opt++;
 170                 if (matches(opt, "-loops") == 0) {
 171                         argc--;
 172                         argv++;
 173                         if (argc <= 1)
 174                                 usage();
 175                         max_flush_loops = atoi(argv[1]);
 176                 } else if (matches(opt, "-family") == 0) {
 177                         argc--;
 178                         argv++;
 179                         if (argc <= 1)
 180                                 usage();
 181                         if (strcmp(argv[1], "inet") == 0)
 182                                 preferred_family = AF_INET;
 183                         else if (strcmp(argv[1], "inet6") == 0)
 184                                 preferred_family = AF_INET6;
 185                         else if (strcmp(argv[1], "dnet") == 0)
 186                                 preferred_family = AF_DECnet;
 187                         else if (strcmp(argv[1], "link") == 0)
 188                                 preferred_family = AF_PACKET;
 189                         else if (strcmp(argv[1], "ipx") == 0)
 190                                 preferred_family = AF_IPX;
 191                         else if (strcmp(argv[1], "bridge") == 0)
 192                                 preferred_family = AF_BRIDGE;
 193                         else if (strcmp(argv[1], "help") == 0)
 194                                 usage();
 195                         else
 196                                 invarg("invalid protocol family", argv[1]);
 197                 } else if (strcmp(opt, "-4") == 0) {
 198                         preferred_family = AF_INET;
 199                 } else if (strcmp(opt, "-6") == 0) {
 200                         preferred_family = AF_INET6;
 201                 } else if (strcmp(opt, "-0") == 0) {
 202                         preferred_family = AF_PACKET;
 203                 } else if (strcmp(opt, "-I") == 0) {
 204                         preferred_family = AF_IPX;
 205                 } else if (strcmp(opt, "-D") == 0) {
 206                         preferred_family = AF_DECnet;
 207                 } else if (strcmp(opt, "-B") == 0) {
 208                         preferred_family = AF_BRIDGE;
 209                 } else if (matches(opt, "-stats") == 0 ||
 210                            matches(opt, "-statistics") == 0) {
 211                         ++show_stats;
 212                 } else if (matches(opt, "-details") == 0) {
 213                         ++show_details;
 214                 } else if (matches(opt, "-resolve") == 0) {
 215                         ++resolve_hosts;
 216                 } else if (matches(opt, "-oneline") == 0) {
 217                         ++oneline;
 218                 } else if (matches(opt, "-timestamp") == 0) {
 219                         ++timestamp;
 220 #if 0
 221                 } else if (matches(opt, "-numeric") == 0) {
 222                         rtnl_names_numeric++;
 223 #endif
 224                 } else if (matches(opt, "-Version") == 0) {
 225                         printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
 226                         exit(0);
 227                 } else if (matches(opt, "-force") == 0) {
 228                         ++force;
 229                 } else if (matches(opt, "-batch") == 0) {
 230                         argc--;
 231                         argv++;
 232                         if (argc <= 1)
 233                                 usage();
 234                         batch_file = argv[1];
 235                 } else if (matches(opt, "-rcvbuf") == 0) {
 236                         unsigned int size;
 237
 238                         argc--;
 239                         argv++;
 240                         if (argc <= 1)
 241                                 usage();
 242                         if (get_unsigned(&size, argv[1], 0)) {
 243                                 fprintf(stderr, "Invalid rcvbuf size '%s'\n",
 244                                         argv[1]);
 245                                 exit(-1);
 246                         }
 247                         rcvbuf = size;
 248                 } else if (matches(opt, "-help") == 0) {
 249                         usage();
 250                 } else {
 251                         fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
 252                         exit(-1);
 253                 }
 254                 argc--; argv++;
 255         }
 256
 257         _SL_ = oneline ? "\\" : "\n" ;
 258
 259         if (batch_file)
 260                 return batch(batch_file);
 261
 262         if (rtnl_open(&rth, 0) < 0)
 263                 exit(1);
 264
 265         if (strlen(basename) > 2)
 266                 return do_cmd(basename+2, argc, argv);
 267
 268         if (argc > 1)
 269                 return do_cmd(argv[1], argc-1, argv+1);
 270
 271         rtnl_close(&rth);
 272         usage();
 273 }