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 #include "veth.h"
  31
  32 int preferred_family = AF_UNSPEC;
  33 int show_stats = 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 | veth }\n"
  51 "       OPTIONS := { -V[ersion] | -s[tatistics] | -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         { "veth",       do_veth },
  81         { "help",       do_help },
  82         { 0 }
  83 };
  84
  85 static int do_cmd(const char *argv0, int argc, char **argv)
  86 {
  87         const struct cmd *c;
  88
  89         for (c = cmds; c->cmd; ++c) {
  90                 if (matches(argv0, c->cmd) == 0)
  91                         return c->func(argc-1, argv+1);
  92         }
  93
  94         fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
  95         return -1;
  96 }
  97
  98 static int batch(const char *name)
  99 {
 100         char *line = NULL;
 101         size_t len = 0;
 102         int ret = 0;
 103         int lineno = 0;
 104
 105         if (name && strcmp(name, "-") != 0) {
 106                 if (freopen(name, "r", stdin) == NULL) {
 107                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s=n",
 108                                 name, strerror(errno));
 109                         return -1;
 110                 }
 111         }
 112
 113         if (rtnl_open(&rth, 0) < 0) {
 114                 fprintf(stderr, "Cannot open rtnetlink\n");
 115                 return -1;
 116         }
 117
 118         while (getcmdline(&line, &len, stdin) != -1) {
 119                 char *largv[100];
 120                 int largc;
 121
 122                 largc = makeargs(line, largv, 100);
 123                 if (largc == 0)
 124                         continue;       /* blank line */
 125
 126                 if (do_cmd(largv[0], largc, largv)) {
 127                         fprintf(stderr, "Command failed %s:%d\n", name, lineno);
 128                         ret = 1;
 129                         if (!force)
 130                                 break;
 131                 }
 132         }
 133         if (line)
 134                 free(line);
 135
 136         rtnl_close(&rth);
 137         return ret;
 138 }
 139
 140
 141 int main(int argc, char **argv)
 142 {
 143         char *basename;
 144
 145         basename = strrchr(argv[0], '/');
 146         if (basename == NULL)
 147                 basename = argv[0];
 148         else
 149                 basename++;
 150
 151         while (argc > 1) {
 152                 char *opt = argv[1];
 153                 if (strcmp(opt,"--") == 0) {
 154                         argc--; argv++;
 155                         break;
 156                 }
 157                 if (opt[0] != '-')
 158                         break;
 159                 if (opt[1] == '-')
 160                         opt++;
 161                 if (matches(opt, "-family") == 0) {
 162                         argc--;
 163                         argv++;
 164                         if (argc <= 1)
 165                                 usage();
 166                         if (strcmp(argv[1], "inet") == 0)
 167                                 preferred_family = AF_INET;
 168                         else if (strcmp(argv[1], "inet6") == 0)
 169                                 preferred_family = AF_INET6;
 170                         else if (strcmp(argv[1], "dnet") == 0)
 171                                 preferred_family = AF_DECnet;
 172                         else if (strcmp(argv[1], "link") == 0)
 173                                 preferred_family = AF_PACKET;
 174                         else if (strcmp(argv[1], "ipx") == 0)
 175                                 preferred_family = AF_IPX;
 176                         else if (strcmp(argv[1], "help") == 0)
 177                                 usage();
 178                         else
 179                                 invarg(argv[1], "invalid protocol family");
 180                 } else if (strcmp(opt, "-4") == 0) {
 181                         preferred_family = AF_INET;
 182                 } else if (strcmp(opt, "-6") == 0) {
 183                         preferred_family = AF_INET6;
 184                 } else if (strcmp(opt, "-0") == 0) {
 185                         preferred_family = AF_PACKET;
 186                 } else if (strcmp(opt, "-I") == 0) {
 187                         preferred_family = AF_IPX;
 188                 } else if (strcmp(opt, "-D") == 0) {
 189                         preferred_family = AF_DECnet;
 190                 } else if (matches(opt, "-stats") == 0 ||
 191                            matches(opt, "-statistics") == 0) {
 192                         ++show_stats;
 193                 } else if (matches(opt, "-resolve") == 0) {
 194                         ++resolve_hosts;
 195                 } else if (matches(opt, "-oneline") == 0) {
 196                         ++oneline;
 197                 } else if (matches(opt, "-timestamp") == 0) {
 198                         ++timestamp;
 199 #if 0
 200                 } else if (matches(opt, "-numeric") == 0) {
 201                         rtnl_names_numeric++;
 202 #endif
 203                 } else if (matches(opt, "-Version") == 0) {
 204                         printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
 205                         exit(0);
 206                 } else if (matches(opt, "-force") == 0) {
 207                         ++force;
 208                 } else if (matches(opt, "-batch") == 0) {
 209                         argc--;
 210                         argv++;
 211                         if (argc <= 1)
 212                                 usage();
 213                         batch_file = argv[1];
 214                 } else if (matches(opt, "-help") == 0) {
 215                         usage();
 216                 } else {
 217                         fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
 218                         exit(-1);
 219                 }
 220                 argc--; argv++;
 221         }
 222
 223         _SL_ = oneline ? "\\" : "\n" ;
 224
 225         if (batch_file)
 226                 return batch(batch_file);
 227
 228         if (rtnl_open(&rth, 0) < 0)
 229                 exit(1);
 230
 231         if (strlen(basename) > 2)
 232                 return do_cmd(basename+2, argc, argv);
 233
 234         if (argc > 1)
 235                 return do_cmd(argv[1], argc-1, argv+1);
 236
 237         rtnl_close(&rth);
 238         usage();
 239 }