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  * Changes:
  13  *
  14  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  15  */
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20 #include <syslog.h>
  21 #include <fcntl.h>
  22 #include <sys/socket.h>
  23 #include <netinet/in.h>
  24 #include <string.h>
  25 #include <errno.h>
  26
  27 #include "SNAPSHOT.h"
  28 #include "utils.h"
  29 #include "ip_common.h"
  30
  31 int preferred_family = AF_UNSPEC;
  32 int show_stats = 0;
  33 int show_details = 0;
  34 int resolve_hosts = 0;
  35 int oneline = 0;
  36 int timestamp = 0;
  37 char * _SL_ = NULL;
  38 char *batch_file = NULL;
  39 int force = 0;
  40 struct rtnl_handle rth = { .fd = -1 };
  41
  42 static void usage(void) __attribute__((noreturn));
  43
  44 static void usage(void)
  45 {
  46         fprintf(stderr,
  47 "Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
  48 "       ip [ -force ] [-batch filename\n"
  49 "where  OBJECT := { link | addr | route | rule | neigh | ntable | tunnel |\n"
  50 "                   maddr | mroute | monitor | xfrm }\n"
  51 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
  52 "                    -f[amily] { inet | inet6 | ipx | dnet | link } |\n"
  53 "                    -o[neline] | -t[imestamp] }\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         { "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         { "monitor",    do_ipmonitor },
  78         { "xfrm",       do_xfrm },
  79         { "mroute",     do_multiroute },
  80         { "help",       do_help },
  81         { 0 }
  82 };
  83
  84 static int do_cmd(const char *argv0, int argc, char **argv)
  85 {
  86         const struct cmd *c;
  87
  88         for (c = cmds; c->cmd; ++c) {
  89                 if (matches(argv0, c->cmd) == 0)
  90                         return c->func(argc-1, argv+1);
  91         }
  92
  93         fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
  94         return -1;
  95 }
  96
  97 static int batch(const char *name)
  98 {
  99         char *line = NULL;
 100         size_t len = 0;
 101         int ret = 0;
 102         int lineno = 0;
 103
 104         if (name && strcmp(name, "-") != 0) {
 105                 if (freopen(name, "r", stdin) == NULL) {
 106                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s=n",
 107                                 name, strerror(errno));
 108                         return -1;
 109                 }
 110         }
 111
 112         if (rtnl_open(&rth, 0) < 0) {
 113                 fprintf(stderr, "Cannot open rtnetlink\n");
 114                 return -1;
 115         }
 116
 117         while (getcmdline(&line, &len, stdin) != -1) {
 118                 char *largv[100];
 119                 int largc;
 120
 121                 largc = makeargs(line, largv, 100);
 122                 if (largc == 0)
 123                         continue;       /* blank line */
 124
 125                 if (do_cmd(largv[0], largc, largv)) {
 126                         fprintf(stderr, "Command failed %s:%d\n", name, lineno);
 127                         ret = 1;
 128                         if (!force)
 129                                 break;
 130                 }
 131         }
 132         if (line)
 133                 free(line);
 134
 135         rtnl_close(&rth);
 136         return ret;
 137 }
 138
 139
 140 int main(int argc, char **argv)
 141 {
 142         char *basename;
 143
 144         basename = strrchr(argv[0], '/');
 145         if (basename == NULL)
 146                 basename = argv[0];
 147         else
 148                 basename++;
 149
 150         while (argc > 1) {
 151                 char *opt = argv[1];
 152                 if (strcmp(opt,"--") == 0) {
 153                         argc--; argv++;
 154                         break;
 155                 }
 156                 if (opt[0] != '-')
 157                         break;
 158                 if (opt[1] == '-')
 159                         opt++;
 160                 if (matches(opt, "-family") == 0) {
 161                         argc--;
 162                         argv++;
 163                         if (argc <= 1)
 164                                 usage();
 165                         if (strcmp(argv[1], "inet") == 0)
 166                                 preferred_family = AF_INET;
 167                         else if (strcmp(argv[1], "inet6") == 0)
 168                                 preferred_family = AF_INET6;
 169                         else if (strcmp(argv[1], "dnet") == 0)
 170                                 preferred_family = AF_DECnet;
 171                         else if (strcmp(argv[1], "link") == 0)
 172                                 preferred_family = AF_PACKET;
 173                         else if (strcmp(argv[1], "ipx") == 0)
 174                                 preferred_family = AF_IPX;
 175                         else if (strcmp(argv[1], "help") == 0)
 176                                 usage();
 177                         else
 178                                 invarg(argv[1], "invalid protocol family");
 179                 } else if (strcmp(opt, "-4") == 0) {
 180                         preferred_family = AF_INET;
 181                 } else if (strcmp(opt, "-6") == 0) {
 182                         preferred_family = AF_INET6;
 183                 } else if (strcmp(opt, "-0") == 0) {
 184                         preferred_family = AF_PACKET;
 185                 } else if (strcmp(opt, "-I") == 0) {
 186                         preferred_family = AF_IPX;
 187                 } else if (strcmp(opt, "-D") == 0) {
 188                         preferred_family = AF_DECnet;
 189                 } else if (matches(opt, "-stats") == 0 ||
 190                            matches(opt, "-statistics") == 0) {
 191                         ++show_stats;
 192                 } else if (matches(opt, "-details") == 0) {
 193                         ++show_details;
 194                 } else if (matches(opt, "-resolve") == 0) {
 195                         ++resolve_hosts;
 196                 } else if (matches(opt, "-oneline") == 0) {
 197                         ++oneline;
 198                 } else if (matches(opt, "-timestamp") == 0) {
 199                         ++timestamp;
 200 #if 0
 201                 } else if (matches(opt, "-numeric") == 0) {
 202                         rtnl_names_numeric++;
 203 #endif
 204                 } else if (matches(opt, "-Version") == 0) {
 205                         printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
 206                         exit(0);
 207                 } else if (matches(opt, "-force") == 0) {
 208                         ++force;
 209                 } else if (matches(opt, "-batch") == 0) {
 210                         argc--;
 211                         argv++;
 212                         if (argc <= 1)
 213                                 usage();
 214                         batch_file = argv[1];
 215                 } else if (matches(opt, "-help") == 0) {
 216                         usage();
 217                 } else {
 218                         fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
 219                         exit(-1);
 220                 }
 221                 argc--; argv++;
 222         }
 223
 224         _SL_ = oneline ? "\\" : "\n" ;
 225
 226         if (batch_file)
 227                 return batch(batch_file);
 228
 229         if (rtnl_open(&rth, 0) < 0)
 230                 exit(1);
 231
 232         if (strlen(basename) > 2)
 233                 return do_cmd(basename+2, argc, argv);
 234
 235         if (argc > 1)
 236                 return do_cmd(argv[1], argc-1, argv+1);
 237
 238         rtnl_close(&rth);
 239         usage();
 240 }