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