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 struct rtnl_handle rth = { .fd = -1 };
  36
  37 static void usage(void) __attribute__((noreturn));
  38
  39 static void usage(void)
  40 {
  41         fprintf(stderr,
  42 "Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
  43 "       ip [ -force ] -batch filename\n"
  44 "where  OBJECT := { link | addr | addrlabel | route | rule | neigh | ntable |\n"
  45 "                   tunnel | tuntap | maddr | mroute | mrule | monitor | xfrm }\n"
  46 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
  47 "                    -f[amily] { inet | inet6 | ipx | dnet | link } |\n"
  48 "                    -o[neline] | -t[imestamp] | -b[atch] [filename] |\n"
  49 "                    -rc[vbuf] [size]}\n");
  50         exit(-1);
  51 }
  52
  53 static int do_help(int argc, char **argv)
  54 {
  55         usage();
  56 }
  57
  58 static const struct cmd {
  59         const char *cmd;
  60         int (*func)(int argc, char **argv);
  61 } cmds[] = {
  62         { "address",    do_ipaddr },
  63         { "addrlabel",  do_ipaddrlabel },
  64         { "maddress",   do_multiaddr },
  65         { "route",      do_iproute },
  66         { "rule",       do_iprule },
  67         { "neighbor",   do_ipneigh },
  68         { "neighbour",  do_ipneigh },
  69         { "ntable",     do_ipntable },
  70         { "ntbl",       do_ipntable },
  71         { "link",       do_iplink },
  72         { "tunnel",     do_iptunnel },
  73         { "tunl",       do_iptunnel },
  74         { "tuntap",     do_iptuntap },
  75         { "tap",        do_iptuntap },
  76         { "monitor",    do_ipmonitor },
  77         { "xfrm",       do_xfrm },
  78         { "mroute",     do_multiroute },
  79         { "mrule",      do_multirule },
  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
 103         if (name && strcmp(name, "-") != 0) {
 104                 if (freopen(name, "r", stdin) == NULL) {
 105                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s\n",
 106                                 name, strerror(errno));
 107                         return -1;
 108                 }
 109         }
 110
 111         if (rtnl_open(&rth, 0) < 0) {
 112                 fprintf(stderr, "Cannot open rtnetlink\n");
 113                 return -1;
 114         }
 115
 116         cmdlineno = 0;
 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, cmdlineno);
 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, "-rcvbuf") == 0) {
 216                         unsigned int size;
 217
 218                         argc--;
 219                         argv++;
 220                         if (argc <= 1)
 221                                 usage();
 222                         if (get_unsigned(&size, argv[1], 0)) {
 223                                 fprintf(stderr, "Invalid rcvbuf size '%s'\n",
 224                                         argv[1]);
 225                                 exit(-1);
 226                         }
 227                         rcvbuf = size;
 228                 } else if (matches(opt, "-help") == 0) {
 229                         usage();
 230                 } else {
 231                         fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
 232                         exit(-1);
 233                 }
 234                 argc--; argv++;
 235         }
 236
 237         _SL_ = oneline ? "\\" : "\n" ;
 238
 239         if (batch_file)
 240                 return batch(batch_file);
 241
 242         if (rtnl_open(&rth, 0) < 0)
 243                 exit(1);
 244
 245         if (strlen(basename) > 2)
 246                 return do_cmd(basename+2, argc, argv);
 247
 248         if (argc > 1)
 249                 return do_cmd(argv[1], argc-1, argv+1);
 250
 251         rtnl_close(&rth);
 252         usage();
 253 }