iw.c

   1 /*
   2  * nl80211 userspace tool
   3  *
   4  * Copyright 2007, 2008 Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #include <errno.h>
   8 #include <stdio.h>
   9 #include <string.h>
  10
  11 #include <netlink/genl/genl.h>
  12 #include <netlink/genl/family.h>
  13 #include <netlink/genl/ctrl.h>
  14 #include <netlink/msg.h>
  15 #include <netlink/attr.h>
  16 #include <linux/nl80211.h>
  17
  18 #include "iw.h"
  19
  20
  21 static int nl80211_init(struct nl80211_state *state)
  22 {
  23         int err;
  24
  25         state->nl_handle = nl_handle_alloc();
  26         if (!state->nl_handle) {
  27                 fprintf(stderr, "Failed to allocate netlink handle.\n");
  28                 return -ENOMEM;
  29         }
  30
  31         if (genl_connect(state->nl_handle)) {
  32                 fprintf(stderr, "Failed to connect to generic netlink.\n");
  33                 err = -ENOLINK;
  34                 goto out_handle_destroy;
  35         }
  36
  37         state->nl_cache = genl_ctrl_alloc_cache(state->nl_handle);
  38         if (!state->nl_cache) {
  39                 fprintf(stderr, "Failed to allocate generic netlink cache.\n");
  40                 err = -ENOMEM;
  41                 goto out_handle_destroy;
  42         }
  43
  44         state->nl80211 = genl_ctrl_search_by_name(state->nl_cache, "nl80211");
  45         if (!state->nl80211) {
  46                 fprintf(stderr, "nl80211 not found.\n");
  47                 err = -ENOENT;
  48                 goto out_cache_free;
  49         }
  50
  51         return 0;
  52
  53  out_cache_free:
  54         nl_cache_free(state->nl_cache);
  55  out_handle_destroy:
  56         nl_handle_destroy(state->nl_handle);
  57         return err;
  58 }
  59
  60 static void nl80211_cleanup(struct nl80211_state *state)
  61 {
  62         genl_family_put(state->nl80211);
  63         nl_cache_free(state->nl_cache);
  64         nl_handle_destroy(state->nl_handle);
  65 }
  66
  67 /*
  68  * return
  69  *      0 - error
  70  *      1 - phy
  71  *      2 - dev
  72  */
  73 static int get_phy_or_dev(int *argc, char ***argv, char **name)
  74 {
  75         char *type = (*argv)[0];
  76
  77         if (*argc < 2)
  78                 return 0;
  79
  80         *name = (*argv)[1];
  81
  82         *argc -= 2;
  83         *argv += 2;
  84
  85         if (strcmp(type, "phy") == 0)
  86                 return 1;
  87         if (strcmp(type, "dev") == 0)
  88                 return 2;
  89
  90         return 0;
  91 }
  92
  93 static void usage(char *argv0)
  94 {
  95         fprintf(stderr, "Usage: %1$s dev <phydev> <OBJECT> <COMMAND> [OPTIONS]"
  96                         "\n     %1$s dev <phydev> info"
  97                         "\n     %1$s reg set <ISO/IEC 3166-1 alpha2>\n"
  98                         "\n"
  99                         "where OBJECT := { interface | station | mpath | info }\n"
 100                         "and COMMAND := { add | del | set | get | dump }\n",
 101                         argv0);
 102 }
 103
 104 int main(int argc, char **argv)
 105 {
 106         struct nl80211_state nlstate;
 107         int err = 0, pod;
 108         char *ifname = NULL, *phyname = NULL, *type, *argv0;
 109
 110         err = nl80211_init(&nlstate);
 111         if (err)
 112                 return 1;
 113
 114         /* strip off self */
 115         argc--;
 116         argv0 = *argv++;
 117
 118         if (argc == 0 || (argc == 1 && strcmp(*argv, "help") == 0)) {
 119                 usage(argv0);
 120                 goto out;
 121         }
 122
 123         if (strcmp(argv[0], "reg") == 0) {
 124                 argc--;
 125                 argv++;
 126                 err = handle_reg(&nlstate, argc, argv);
 127                 goto out;
 128         }
 129
 130         pod = get_phy_or_dev(&argc, &argv, &ifname);
 131         if (pod == 0) {
 132                 err = 1;
 133                 goto out;
 134         }
 135
 136         if (pod == 1) {
 137                 phyname = ifname;
 138                 ifname = NULL;
 139         }
 140
 141         if (argc <= 0) {
 142                 err = 1;
 143                 goto out;
 144         }
 145
 146         type = argv[0];
 147         argc--;
 148         argv++;
 149
 150         if (strcmp(type, "interface") == 0)
 151                 err = handle_interface(&nlstate, phyname, ifname, argc, argv);
 152         else if (strcmp(type, "info") == 0)
 153                 err = handle_info(&nlstate, phyname, ifname);
 154         else if (strcmp(type, "station") == 0)
 155                 err = handle_station(&nlstate, ifname, argc, argv);
 156         else if (strcmp(type, "mpath") == 0)
 157                 err = handle_mpath(&nlstate, ifname, argc, argv);
 158         else {
 159                 fprintf(stderr, "No such object type %s\n", type);
 160                 err = 1;
 161         }
 162
 163  out:
 164         nl80211_cleanup(&nlstate);
 165
 166         return err;
 167 }