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 <fcntl.h>
  16 #include <sys/socket.h>
  17 #include <netinet/in.h>
  18 #include <string.h>
  19 #include <errno.h>
  20
  21 #include "SNAPSHOT.h"
  22 #include "utils.h"
  23 #include "ip_common.h"
  24 #include "namespace.h"
  25 #include "color.h"
  26
  27 int preferred_family = AF_UNSPEC;
  28 int human_readable;
  29 int use_iec;
  30 int show_stats;
  31 int show_details;
  32 int oneline;
  33 int brief;
  34 int json;
  35 int timestamp;
  36 const char *_SL_;
  37 int force;
  38 int max_flush_loops = 10;
  39 int batch_mode;
  40 bool do_all;
  41
  42 struct rtnl_handle rth = { .fd = -1 };
  43
  44 static void usage(void) __attribute__((noreturn));
  45
  46 static void usage(void)
  47 {
  48         fprintf(stderr,
  49 "Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
  50 "       ip [ -force ] -batch filename\n"
  51 "where  OBJECT := { link | address | addrlabel | route | rule | neigh | ntable |\n"
  52 "                   tunnel | tuntap | maddress | mroute | mrule | monitor | xfrm |\n"
  53 "                   netns | l2tp | fou | macsec | tcp_metrics | token | netconf | ila |\n"
  54 "                   vrf | sr }\n"
  55 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
  56 "                    -h[uman-readable] | -iec | -j[son] | -p[retty] |\n"
  57 "                    -f[amily] { inet | inet6 | ipx | dnet | mpls | bridge | link } |\n"
  58 "                    -4 | -6 | -I | -D | -B | -0 |\n"
  59 "                    -l[oops] { maximum-addr-flush-attempts } | -br[ief] |\n"
  60 "                    -o[neline] | -t[imestamp] | -ts[hort] | -b[atch] [filename] |\n"
  61 "                    -rc[vbuf] [size] | -n[etns] name | -a[ll] | -c[olor]}\n");
  62         exit(-1);
  63 }
  64
  65 static int do_help(int argc, char **argv)
  66 {
  67         usage();
  68         return 0;
  69 }
  70
  71 static const struct cmd {
  72         const char *cmd;
  73         int (*func)(int argc, char **argv);
  74 } cmds[] = {
  75         { "address",    do_ipaddr },
  76         { "addrlabel",  do_ipaddrlabel },
  77         { "maddress",   do_multiaddr },
  78         { "route",      do_iproute },
  79         { "rule",       do_iprule },
  80         { "neighbor",   do_ipneigh },
  81         { "neighbour",  do_ipneigh },
  82         { "ntable",     do_ipntable },
  83         { "ntbl",       do_ipntable },
  84         { "link",       do_iplink },
  85         { "l2tp",       do_ipl2tp },
  86         { "fou",        do_ipfou },
  87         { "ila",        do_ipila },
  88         { "macsec",     do_ipmacsec },
  89         { "tunnel",     do_iptunnel },
  90         { "tunl",       do_iptunnel },
  91         { "tuntap",     do_iptuntap },
  92         { "tap",        do_iptuntap },
  93         { "token",      do_iptoken },
  94         { "tcpmetrics", do_tcp_metrics },
  95         { "tcp_metrics", do_tcp_metrics },
  96         { "monitor",    do_ipmonitor },
  97         { "xfrm",       do_xfrm },
  98         { "mroute",     do_multiroute },
  99         { "mrule",      do_multirule },
 100         { "netns",      do_netns },
 101         { "netconf",    do_ipnetconf },
 102         { "vrf",        do_ipvrf},
 103         { "sr",         do_seg6 },
 104         { "help",       do_help },
 105         { 0 }
 106 };
 107
 108 static int do_cmd(const char *argv0, int argc, char **argv)
 109 {
 110         const struct cmd *c;
 111
 112         for (c = cmds; c->cmd; ++c) {
 113                 if (matches(argv0, c->cmd) == 0)
 114                         return -(c->func(argc-1, argv+1));
 115         }
 116
 117         fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
 118         return EXIT_FAILURE;
 119 }
 120
 121 static int batch(const char *name)
 122 {
 123         char *line = NULL;
 124         size_t len = 0;
 125         int ret = EXIT_SUCCESS;
 126         int orig_family = preferred_family;
 127
 128         batch_mode = 1;
 129
 130         if (name && strcmp(name, "-") != 0) {
 131                 if (freopen(name, "r", stdin) == NULL) {
 132                         fprintf(stderr,
 133                                 "Cannot open file \"%s\" for reading: %s\n",
 134                                 name, strerror(errno));
 135                         return EXIT_FAILURE;
 136                 }
 137         }
 138
 139         if (rtnl_open(&rth, 0) < 0) {
 140                 fprintf(stderr, "Cannot open rtnetlink\n");
 141                 return EXIT_FAILURE;
 142         }
 143
 144         cmdlineno = 0;
 145         while (getcmdline(&line, &len, stdin) != -1) {
 146                 char *largv[100];
 147                 int largc;
 148
 149                 preferred_family = orig_family;
 150
 151                 largc = makeargs(line, largv, 100);
 152                 if (largc == 0)
 153                         continue;       /* blank line */
 154
 155                 if (do_cmd(largv[0], largc, largv)) {
 156                         fprintf(stderr, "Command failed %s:%d\n",
 157                                 name, cmdlineno);
 158                         ret = EXIT_FAILURE;
 159                         if (!force)
 160                                 break;
 161                 }
 162         }
 163         if (line)
 164                 free(line);
 165
 166         rtnl_close(&rth);
 167         return ret;
 168 }
 169
 170
 171 int main(int argc, char **argv)
 172 {
 173         char *basename;
 174         char *batch_file = NULL;
 175         int color = 0;
 176
 177         /* to run vrf exec without root, capabilities might be set, drop them
 178          * if not needed as the first thing.
 179          * execv will drop them for the child command.
 180          * vrf exec requires:
 181          * - cap_dac_override to create the cgroup subdir in /sys
 182          * - cap_sys_admin to load the BPF program
 183          * - cap_net_admin to set the socket into the cgroup
 184          */
 185         if (argc < 3 || strcmp(argv[1], "vrf") != 0 ||
 186                         strcmp(argv[2], "exec") != 0)
 187                 drop_cap();
 188
 189         basename = strrchr(argv[0], '/');
 190         if (basename == NULL)
 191                 basename = argv[0];
 192         else
 193                 basename++;
 194
 195         while (argc > 1) {
 196                 char *opt = argv[1];
 197
 198                 if (strcmp(opt, "--") == 0) {
 199                         argc--; argv++;
 200                         break;
 201                 }
 202                 if (opt[0] != '-')
 203                         break;
 204                 if (opt[1] == '-')
 205                         opt++;
 206                 if (matches(opt, "-loops") == 0) {
 207                         argc--;
 208                         argv++;
 209                         if (argc <= 1)
 210                                 usage();
 211                         max_flush_loops = atoi(argv[1]);
 212                 } else if (matches(opt, "-family") == 0) {
 213                         argc--;
 214                         argv++;
 215                         if (argc <= 1)
 216                                 usage();
 217                         if (strcmp(argv[1], "help") == 0)
 218                                 usage();
 219                         else
 220                                 preferred_family = read_family(argv[1]);
 221                         if (preferred_family == AF_UNSPEC)
 222                                 invarg("invalid protocol family", argv[1]);
 223                 } else if (strcmp(opt, "-4") == 0) {
 224                         preferred_family = AF_INET;
 225                 } else if (strcmp(opt, "-6") == 0) {
 226                         preferred_family = AF_INET6;
 227                 } else if (strcmp(opt, "-0") == 0) {
 228                         preferred_family = AF_PACKET;
 229                 } else if (strcmp(opt, "-I") == 0) {
 230                         preferred_family = AF_IPX;
 231                 } else if (strcmp(opt, "-D") == 0) {
 232                         preferred_family = AF_DECnet;
 233                 } else if (strcmp(opt, "-M") == 0) {
 234                         preferred_family = AF_MPLS;
 235                 } else if (strcmp(opt, "-B") == 0) {
 236                         preferred_family = AF_BRIDGE;
 237                 } else if (matches(opt, "-human") == 0 ||
 238                            matches(opt, "-human-readable") == 0) {
 239                         ++human_readable;
 240                 } else if (matches(opt, "-iec") == 0) {
 241                         ++use_iec;
 242                 } else if (matches(opt, "-stats") == 0 ||
 243                            matches(opt, "-statistics") == 0) {
 244                         ++show_stats;
 245                 } else if (matches(opt, "-details") == 0) {
 246                         ++show_details;
 247                 } else if (matches(opt, "-resolve") == 0) {
 248                         ++resolve_hosts;
 249                 } else if (matches(opt, "-oneline") == 0) {
 250                         ++oneline;
 251                 } else if (matches(opt, "-timestamp") == 0) {
 252                         ++timestamp;
 253                 } else if (matches(opt, "-tshort") == 0) {
 254                         ++timestamp;
 255                         ++timestamp_short;
 256                 } else if (matches(opt, "-Version") == 0) {
 257                         printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
 258                         exit(0);
 259                 } else if (matches(opt, "-force") == 0) {
 260                         ++force;
 261                 } else if (matches(opt, "-batch") == 0) {
 262                         argc--;
 263                         argv++;
 264                         if (argc <= 1)
 265                                 usage();
 266                         batch_file = argv[1];
 267                 } else if (matches(opt, "-brief") == 0) {
 268                         ++brief;
 269                 } else if (matches(opt, "-json") == 0) {
 270                         ++json;
 271                 } else if (matches(opt, "-pretty") == 0) {
 272                         ++pretty;
 273                 } else if (matches(opt, "-rcvbuf") == 0) {
 274                         unsigned int size;
 275
 276                         argc--;
 277                         argv++;
 278                         if (argc <= 1)
 279                                 usage();
 280                         if (get_unsigned(&size, argv[1], 0)) {
 281                                 fprintf(stderr, "Invalid rcvbuf size '%s'\n",
 282                                         argv[1]);
 283                                 exit(-1);
 284                         }
 285                         rcvbuf = size;
 286                 } else if (matches(opt, "-color") == 0) {
 287                         ++color;
 288                 } else if (matches(opt, "-help") == 0) {
 289                         usage();
 290                 } else if (matches(opt, "-netns") == 0) {
 291                         NEXT_ARG();
 292                         if (netns_switch(argv[1]))
 293                                 exit(-1);
 294                 } else if (matches(opt, "-all") == 0) {
 295                         do_all = true;
 296                 } else {
 297                         fprintf(stderr,
 298                                 "Option \"%s\" is unknown, try \"ip -help\".\n",
 299                                 opt);
 300                         exit(-1);
 301                 }
 302                 argc--; argv++;
 303         }
 304
 305         _SL_ = oneline ? "\\" : "\n";
 306
 307         if (color && !json)
 308                 enable_color();
 309
 310         if (batch_file)
 311                 return batch(batch_file);
 312
 313         if (rtnl_open(&rth, 0) < 0)
 314                 exit(1);
 315
 316         if (strlen(basename) > 2)
 317                 return do_cmd(basename+2, argc, argv);
 318
 319         if (argc > 1)
 320                 return do_cmd(argv[1], argc-1, argv+1);
 321
 322         rtnl_close(&rth);
 323         usage();
 324 }