bridge/bridge.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Get/set/delete bridge with netlink
   4  *
   5  * Authors:     Stephen Hemminger <shemminger@vyatta.com>
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <sys/socket.h>
  12 #include <string.h>
  13 #include <errno.h>
  14
  15 #include "SNAPSHOT.h"
  16 #include "utils.h"
  17 #include "br_common.h"
  18 #include "namespace.h"
  19 #include "color.h"
  20
  21 struct rtnl_handle rth = { .fd = -1 };
  22 int preferred_family = AF_UNSPEC;
  23 int oneline;
  24 int show_stats;
  25 int show_details;
  26 static int color;
  27 int compress_vlans;
  28 int json;
  29 int timestamp;
  30 static const char *batch_file;
  31 int force;
  32
  33 static void usage(void) __attribute__((noreturn));
  34
  35 static void usage(void)
  36 {
  37         fprintf(stderr,
  38 "Usage: bridge [ OPTIONS ] OBJECT { COMMAND | help }\n"
  39 "       bridge [ -force ] -batch filename\n"
  40 "where  OBJECT := { link | fdb | mdb | vlan | monitor }\n"
  41 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] |\n"
  42 "                    -o[neline] | -t[imestamp] | -n[etns] name |\n"
  43 "                    -c[ompressvlans] -color -p[retty] -j[son] }\n");
  44         exit(-1);
  45 }
  46
  47 static int do_help(int argc, char **argv)
  48 {
  49         usage();
  50 }
  51
  52
  53 static const struct cmd {
  54         const char *cmd;
  55         int (*func)(int argc, char **argv);
  56 } cmds[] = {
  57         { "link",       do_link },
  58         { "fdb",        do_fdb },
  59         { "mdb",        do_mdb },
  60         { "vlan",       do_vlan },
  61         { "monitor",    do_monitor },
  62         { "help",       do_help },
  63         { 0 }
  64 };
  65
  66 static int do_cmd(const char *argv0, int argc, char **argv)
  67 {
  68         const struct cmd *c;
  69
  70         for (c = cmds; c->cmd; ++c) {
  71                 if (matches(argv0, c->cmd) == 0)
  72                         return c->func(argc-1, argv+1);
  73         }
  74
  75         fprintf(stderr,
  76                 "Object \"%s\" is unknown, try \"bridge help\".\n", argv0);
  77         return -1;
  78 }
  79
  80 static int batch(const char *name)
  81 {
  82         char *line = NULL;
  83         size_t len = 0;
  84         int ret = EXIT_SUCCESS;
  85
  86         if (name && strcmp(name, "-") != 0) {
  87                 if (freopen(name, "r", stdin) == NULL) {
  88                         fprintf(stderr,
  89                                 "Cannot open file \"%s\" for reading: %s\n",
  90                                 name, strerror(errno));
  91                         return EXIT_FAILURE;
  92                 }
  93         }
  94
  95         if (rtnl_open(&rth, 0) < 0) {
  96                 fprintf(stderr, "Cannot open rtnetlink\n");
  97                 return EXIT_FAILURE;
  98         }
  99
 100         cmdlineno = 0;
 101         while (getcmdline(&line, &len, stdin) != -1) {
 102                 char *largv[100];
 103                 int largc;
 104
 105                 largc = makeargs(line, largv, 100);
 106                 if (largc == 0)
 107                         continue;       /* blank line */
 108
 109                 if (do_cmd(largv[0], largc, largv)) {
 110                         fprintf(stderr, "Command failed %s:%d\n",
 111                                 name, cmdlineno);
 112                         ret = EXIT_FAILURE;
 113                         if (!force)
 114                                 break;
 115                 }
 116         }
 117         if (line)
 118                 free(line);
 119
 120         rtnl_close(&rth);
 121         return ret;
 122 }
 123
 124 int
 125 main(int argc, char **argv)
 126 {
 127         while (argc > 1) {
 128                 const char *opt = argv[1];
 129
 130                 if (strcmp(opt, "--") == 0) {
 131                         argc--; argv++;
 132                         break;
 133                 }
 134                 if (opt[0] != '-')
 135                         break;
 136                 if (opt[1] == '-')
 137                         opt++;
 138
 139                 if (matches(opt, "-help") == 0) {
 140                         usage();
 141                 } else if (matches(opt, "-Version") == 0) {
 142                         printf("bridge utility, 0.0\n");
 143                         exit(0);
 144                 } else if (matches(opt, "-stats") == 0 ||
 145                            matches(opt, "-statistics") == 0) {
 146                         ++show_stats;
 147                 } else if (matches(opt, "-details") == 0) {
 148                         ++show_details;
 149                 } else if (matches(opt, "-oneline") == 0) {
 150                         ++oneline;
 151                 } else if (matches(opt, "-timestamp") == 0) {
 152                         ++timestamp;
 153                 } else if (matches(opt, "-family") == 0) {
 154                         argc--;
 155                         argv++;
 156                         if (argc <= 1)
 157                                 usage();
 158                         if (strcmp(argv[1], "inet") == 0)
 159                                 preferred_family = AF_INET;
 160                         else if (strcmp(argv[1], "inet6") == 0)
 161                                 preferred_family = AF_INET6;
 162                         else if (strcmp(argv[1], "help") == 0)
 163                                 usage();
 164                         else
 165                                 invarg("invalid protocol family", argv[1]);
 166                 } else if (strcmp(opt, "-4") == 0) {
 167                         preferred_family = AF_INET;
 168                 } else if (strcmp(opt, "-6") == 0) {
 169                         preferred_family = AF_INET6;
 170                 } else if (matches(opt, "-netns") == 0) {
 171                         NEXT_ARG();
 172                         if (netns_switch(argv[1]))
 173                                 exit(-1);
 174                 } else if (matches(opt, "-compressvlans") == 0) {
 175                         ++compress_vlans;
 176                 } else if (matches_color(opt, &color)) {
 177                 } else if (matches(opt, "-force") == 0) {
 178                         ++force;
 179                 } else if (matches(opt, "-json") == 0) {
 180                         ++json;
 181                 } else if (matches(opt, "-pretty") == 0) {
 182                         ++pretty;
 183                 } else if (matches(opt, "-batch") == 0) {
 184                         argc--;
 185                         argv++;
 186                         if (argc <= 1)
 187                                 usage();
 188                         batch_file = argv[1];
 189                 } else {
 190                         fprintf(stderr,
 191                                 "Option \"%s\" is unknown, try \"bridge help\".\n",
 192                                 opt);
 193                         exit(-1);
 194                 }
 195                 argc--; argv++;
 196         }
 197
 198         _SL_ = oneline ? "\\" : "\n";
 199
 200         check_enable_color(color, json);
 201
 202         if (batch_file)
 203                 return batch(batch_file);
 204
 205         if (rtnl_open(&rth, 0) < 0)
 206                 exit(1);
 207
 208         if (argc > 1)
 209                 return do_cmd(argv[1], argc-1, argv+1);
 210
 211         rtnl_close(&rth);
 212         usage();
 213 }