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 int force = 0;
  34 int max_flush_loops = 10;
  35 int batch_mode = 0;
  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 | token }\n"
  49 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
  50 "                    -f[amily] { inet | inet6 | ipx | dnet | bridge | link } |\n"
  51 "                    -4 | -6 | -I | -D | -B | -0 |\n"
  52 "                    -l[oops] { maximum-addr-flush-attempts } |\n"
  53 "                    -o[neline] | -t[imestamp] | -b[atch] [filename] |\n"
  54 "                    -rc[vbuf] [size]}\n");
  55         exit(-1);
  56 }
  57
  58 static int do_help(int argc, char **argv)
  59 {
  60         usage();
  61         return 0;
  62 }
  63
  64 static const struct cmd {
  65         const char *cmd;
  66         int (*func)(int argc, char **argv);
  67 } cmds[] = {
  68         { "address",    do_ipaddr },
  69         { "addrlabel",  do_ipaddrlabel },
  70         { "maddress",   do_multiaddr },
  71         { "route",      do_iproute },
  72         { "rule",       do_iprule },
  73         { "neighbor",   do_ipneigh },
  74         { "neighbour",  do_ipneigh },
  75         { "ntable",     do_ipntable },
  76         { "ntbl",       do_ipntable },
  77         { "link",       do_iplink },
  78         { "l2tp",       do_ipl2tp },
  79         { "tunnel",     do_iptunnel },
  80         { "tunl",       do_iptunnel },
  81         { "tuntap",     do_iptuntap },
  82         { "tap",        do_iptuntap },
  83         { "token",      do_iptoken },
  84         { "tcpmetrics", do_tcp_metrics },
  85         { "tcp_metrics",do_tcp_metrics },
  86         { "monitor",    do_ipmonitor },
  87         { "xfrm",       do_xfrm },
  88         { "mroute",     do_multiroute },
  89         { "mrule",      do_multirule },
  90         { "netns",      do_netns },
  91         { "netconf",    do_ipnetconf },
  92         { "help",       do_help },
  93         { 0 }
  94 };
  95
  96 static int do_cmd(const char *argv0, int argc, char **argv)
  97 {
  98         const struct cmd *c;
  99
 100         for (c = cmds; c->cmd; ++c) {
 101                 if (matches(argv0, c->cmd) == 0) {
 102                         return -(c->func(argc-1, argv+1));
 103                 }
 104         }
 105
 106         fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
 107         return EXIT_FAILURE;
 108 }
 109
 110 static int batch(const char *name)
 111 {
 112         char *line = NULL;
 113         size_t len = 0;
 114         int ret = EXIT_SUCCESS;
 115
 116         batch_mode = 1;
 117
 118         if (name && strcmp(name, "-") != 0) {
 119                 if (freopen(name, "r", stdin) == NULL) {
 120                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s\n",
 121                                 name, strerror(errno));
 122                         return EXIT_FAILURE;
 123                 }
 124         }
 125
 126         if (rtnl_open(&rth, 0) < 0) {
 127                 fprintf(stderr, "Cannot open rtnetlink\n");
 128                 return EXIT_FAILURE;
 129         }
 130
 131         cmdlineno = 0;
 132         while (getcmdline(&line, &len, stdin) != -1) {
 133                 char *largv[100];
 134                 int largc;
 135
 136                 largc = makeargs(line, largv, 100);
 137                 if (largc == 0)
 138                         continue;       /* blank line */
 139
 140                 if (do_cmd(largv[0], largc, largv)) {
 141                         fprintf(stderr, "Command failed %s:%d\n", name, cmdlineno);
 142                         ret = EXIT_FAILURE;
 143                         if (!force)
 144                                 break;
 145                 }
 146         }
 147         if (line)
 148                 free(line);
 149
 150         rtnl_close(&rth);
 151         return ret;
 152 }
 153
 154
 155 int main(int argc, char **argv)
 156 {
 157         char *basename;
 158         char *batch_file = NULL;
 159
 160         basename = strrchr(argv[0], '/');
 161         if (basename == NULL)
 162                 basename = argv[0];
 163         else
 164                 basename++;
 165
 166         while (argc > 1) {
 167                 char *opt = argv[1];
 168                 if (strcmp(opt,"--") == 0) {
 169                         argc--; argv++;
 170                         break;
 171                 }
 172                 if (opt[0] != '-')
 173                         break;
 174                 if (opt[1] == '-')
 175                         opt++;
 176                 if (matches(opt, "-loops") == 0) {
 177                         argc--;
 178                         argv++;
 179                         if (argc <= 1)
 180                                 usage();
 181                         max_flush_loops = atoi(argv[1]);
 182                 } else if (matches(opt, "-family") == 0) {
 183                         argc--;
 184                         argv++;
 185                         if (argc <= 1)
 186                                 usage();
 187                         if (strcmp(argv[1], "inet") == 0)
 188                                 preferred_family = AF_INET;
 189                         else if (strcmp(argv[1], "inet6") == 0)
 190                                 preferred_family = AF_INET6;
 191                         else if (strcmp(argv[1], "dnet") == 0)
 192                                 preferred_family = AF_DECnet;
 193                         else if (strcmp(argv[1], "link") == 0)
 194                                 preferred_family = AF_PACKET;
 195                         else if (strcmp(argv[1], "ipx") == 0)
 196                                 preferred_family = AF_IPX;
 197                         else if (strcmp(argv[1], "bridge") == 0)
 198                                 preferred_family = AF_BRIDGE;
 199                         else if (strcmp(argv[1], "help") == 0)
 200                                 usage();
 201                         else
 202                                 invarg("invalid protocol family", argv[1]);
 203                 } else if (strcmp(opt, "-4") == 0) {
 204                         preferred_family = AF_INET;
 205                 } else if (strcmp(opt, "-6") == 0) {
 206                         preferred_family = AF_INET6;
 207                 } else if (strcmp(opt, "-0") == 0) {
 208                         preferred_family = AF_PACKET;
 209                 } else if (strcmp(opt, "-I") == 0) {
 210                         preferred_family = AF_IPX;
 211                 } else if (strcmp(opt, "-D") == 0) {
 212                         preferred_family = AF_DECnet;
 213                 } else if (strcmp(opt, "-B") == 0) {
 214                         preferred_family = AF_BRIDGE;
 215                 } else if (matches(opt, "-stats") == 0 ||
 216                            matches(opt, "-statistics") == 0) {
 217                         ++show_stats;
 218                 } else if (matches(opt, "-details") == 0) {
 219                         ++show_details;
 220                 } else if (matches(opt, "-resolve") == 0) {
 221                         ++resolve_hosts;
 222                 } else if (matches(opt, "-oneline") == 0) {
 223                         ++oneline;
 224                 } else if (matches(opt, "-timestamp") == 0) {
 225                         ++timestamp;
 226 #if 0
 227                 } else if (matches(opt, "-numeric") == 0) {
 228                         rtnl_names_numeric++;
 229 #endif
 230                 } else if (matches(opt, "-Version") == 0) {
 231                         printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
 232                         exit(0);
 233                 } else if (matches(opt, "-force") == 0) {
 234                         ++force;
 235                 } else if (matches(opt, "-batch") == 0) {
 236                         argc--;
 237                         argv++;
 238                         if (argc <= 1)
 239                                 usage();
 240                         batch_file = argv[1];
 241                 } else if (matches(opt, "-rcvbuf") == 0) {
 242                         unsigned int size;
 243
 244                         argc--;
 245                         argv++;
 246                         if (argc <= 1)
 247                                 usage();
 248                         if (get_unsigned(&size, argv[1], 0)) {
 249                                 fprintf(stderr, "Invalid rcvbuf size '%s'\n",
 250                                         argv[1]);
 251                                 exit(-1);
 252                         }
 253                         rcvbuf = size;
 254                 } else if (matches(opt, "-help") == 0) {
 255                         usage();
 256                 } else {
 257                         fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
 258                         exit(-1);
 259                 }
 260                 argc--; argv++;
 261         }
 262
 263         _SL_ = oneline ? "\\" : "\n" ;
 264
 265         if (batch_file)
 266                 return batch(batch_file);
 267
 268         if (rtnl_open(&rth, 0) < 0)
 269                 exit(1);
 270
 271         if (strlen(basename) > 2)
 272                 return do_cmd(basename+2, argc, argv);
 273
 274         if (argc > 1)
 275                 return do_cmd(argv[1], argc-1, argv+1);
 276
 277         rtnl_close(&rth);
 278         usage();
 279 }