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