wpa_supplicant/main.c

   1 /*
   2  * WPA Supplicant / main() function for UNIX like OSes and MinGW
   3  * Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16 #ifdef __linux__
  17 #include <fcntl.h>
  18 #endif /* __linux__ */
  19
  20 #include "common.h"
  21 #include "wpa_supplicant_i.h"
  22 #include "driver_i.h"
  23
  24 extern struct wpa_driver_ops *wpa_drivers[];
  25
  26
  27 static void usage(void)
  28 {
  29         int i;
  30         printf("%s\n\n%s\n"
  31                "usage:\n"
  32                "  wpa_supplicant [-BddhKLqqstuvW] [-P<pid file>] "
  33                "[-g<global ctrl>] \\\n"
  34                "        -i<ifname> -c<config file> [-C<ctrl>] [-D<driver>] "
  35                "[-p<driver_param>] \\\n"
  36                "        [-b<br_ifname>] [-f<debug file>] [-e<entropy file>] "
  37                "\\\n"
  38                "        [-o<override driver>] [-O<override ctrl>] \\\n"
  39                "        [-N -i<ifname> -c<conf> [-C<ctrl>] "
  40                "[-D<driver>] \\\n"
  41                "        [-p<driver_param>] [-b<br_ifname>] ...]\n"
  42                "\n"
  43                "drivers:\n",
  44                wpa_supplicant_version, wpa_supplicant_license);
  45
  46         for (i = 0; wpa_drivers[i]; i++) {
  47                 printf("  %s = %s\n",
  48                        wpa_drivers[i]->name,
  49                        wpa_drivers[i]->desc);
  50         }
  51
  52 #ifndef CONFIG_NO_STDOUT_DEBUG
  53         printf("options:\n"
  54                "  -b = optional bridge interface name\n"
  55                "  -B = run daemon in the background\n"
  56                "  -c = Configuration file\n"
  57                "  -C = ctrl_interface parameter (only used if -c is not)\n"
  58                "  -i = interface name\n"
  59                "  -d = increase debugging verbosity (-dd even more)\n"
  60                "  -D = driver name (can be multiple drivers: nl80211,wext)\n"
  61                "  -e = entropy file\n");
  62 #ifdef CONFIG_DEBUG_FILE
  63         printf("  -f = log output to debug file instead of stdout\n");
  64 #endif /* CONFIG_DEBUG_FILE */
  65         printf("  -g = global ctrl_interface\n"
  66                "  -K = include keys (passwords, etc.) in debug output\n");
  67 #ifdef CONFIG_DEBUG_SYSLOG
  68         printf("  -s = log output to syslog instead of stdout\n");
  69 #endif /* CONFIG_DEBUG_SYSLOG */
  70         printf("  -t = include timestamp in debug messages\n"
  71                "  -h = show this help text\n"
  72                "  -L = show license (BSD)\n"
  73                "  -o = override driver parameter for new interfaces\n"
  74                "  -O = override ctrl_interface parameter for new interfaces\n"
  75                "  -p = driver parameters\n"
  76                "  -P = PID file\n"
  77                "  -q = decrease debugging verbosity (-qq even less)\n");
  78 #ifdef CONFIG_DBUS
  79         printf("  -u = enable DBus control interface\n");
  80 #endif /* CONFIG_DBUS */
  81         printf("  -v = show version\n"
  82                "  -W = wait for a control interface monitor before starting\n"
  83                "  -N = start describing new interface\n");
  84
  85         printf("example:\n"
  86                "  wpa_supplicant -D%s -iwlan0 -c/etc/wpa_supplicant.conf\n",
  87                wpa_drivers[i] ? wpa_drivers[i]->name : "wext");
  88 #endif /* CONFIG_NO_STDOUT_DEBUG */
  89 }
  90
  91
  92 static void license(void)
  93 {
  94 #ifndef CONFIG_NO_STDOUT_DEBUG
  95         printf("%s\n\n%s%s%s%s%s\n",
  96                wpa_supplicant_version,
  97                wpa_supplicant_full_license1,
  98                wpa_supplicant_full_license2,
  99                wpa_supplicant_full_license3,
 100                wpa_supplicant_full_license4,
 101                wpa_supplicant_full_license5);
 102 #endif /* CONFIG_NO_STDOUT_DEBUG */
 103 }
 104
 105
 106 static void wpa_supplicant_fd_workaround(void)
 107 {
 108 #ifdef __linux__
 109         int s, i;
 110         /* When started from pcmcia-cs scripts, wpa_supplicant might start with
 111          * fd 0, 1, and 2 closed. This will cause some issues because many
 112          * places in wpa_supplicant are still printing out to stdout. As a
 113          * workaround, make sure that fd's 0, 1, and 2 are not used for other
 114          * sockets. */
 115         for (i = 0; i < 3; i++) {
 116                 s = open("/dev/null", O_RDWR);
 117                 if (s > 2) {
 118                         close(s);
 119                         break;
 120                 }
 121         }
 122 #endif /* __linux__ */
 123 }
 124
 125
 126 int main(int argc, char *argv[])
 127 {
 128         int c, i;
 129         struct wpa_interface *ifaces, *iface;
 130         int iface_count, exitcode = -1;
 131         struct wpa_params params;
 132         struct wpa_global *global;
 133
 134         if (os_program_init())
 135                 return -1;
 136
 137         os_memset(&params, 0, sizeof(params));
 138         params.wpa_debug_level = MSG_INFO;
 139
 140         iface = ifaces = os_zalloc(sizeof(struct wpa_interface));
 141         if (ifaces == NULL)
 142                 return -1;
 143         iface_count = 1;
 144
 145         wpa_supplicant_fd_workaround();
 146
 147         for (;;) {
 148                 c = getopt(argc, argv, "b:Bc:C:D:de:f:g:hi:KLNo:O:p:P:qstuvW");
 149                 if (c < 0)
 150                         break;
 151                 switch (c) {
 152                 case 'b':
 153                         iface->bridge_ifname = optarg;
 154                         break;
 155                 case 'B':
 156                         params.daemonize++;
 157                         break;
 158                 case 'c':
 159                         iface->confname = optarg;
 160                         break;
 161                 case 'C':
 162                         iface->ctrl_interface = optarg;
 163                         break;
 164                 case 'D':
 165                         iface->driver = optarg;
 166                         break;
 167                 case 'd':
 168 #ifdef CONFIG_NO_STDOUT_DEBUG
 169                         printf("Debugging disabled with "
 170                                "CONFIG_NO_STDOUT_DEBUG=y build time "
 171                                "option.\n");
 172                         goto out;
 173 #else /* CONFIG_NO_STDOUT_DEBUG */
 174                         params.wpa_debug_level--;
 175                         break;
 176 #endif /* CONFIG_NO_STDOUT_DEBUG */
 177                 case 'e':
 178                         params.entropy_file = optarg;
 179                         break;
 180 #ifdef CONFIG_DEBUG_FILE
 181                 case 'f':
 182                         params.wpa_debug_file_path = optarg;
 183                         break;
 184 #endif /* CONFIG_DEBUG_FILE */
 185                 case 'g':
 186                         params.ctrl_interface = optarg;
 187                         break;
 188                 case 'h':
 189                         usage();
 190                         exitcode = 0;
 191                         goto out;
 192                 case 'i':
 193                         iface->ifname = optarg;
 194                         break;
 195                 case 'K':
 196                         params.wpa_debug_show_keys++;
 197                         break;
 198                 case 'L':
 199                         license();
 200                         exitcode = 0;
 201                         goto out;
 202                 case 'o':
 203                         params.override_driver = optarg;
 204                         break;
 205                 case 'O':
 206                         params.override_ctrl_interface = optarg;
 207                         break;
 208                 case 'p':
 209                         iface->driver_param = optarg;
 210                         break;
 211                 case 'P':
 212                         os_free(params.pid_file);
 213                         params.pid_file = os_rel2abs_path(optarg);
 214                         break;
 215                 case 'q':
 216                         params.wpa_debug_level++;
 217                         break;
 218 #ifdef CONFIG_DEBUG_SYSLOG
 219                 case 's':
 220                         params.wpa_debug_syslog++;
 221                         break;
 222 #endif /* CONFIG_DEBUG_SYSLOG */
 223                 case 't':
 224                         params.wpa_debug_timestamp++;
 225                         break;
 226 #ifdef CONFIG_DBUS
 227                 case 'u':
 228                         params.dbus_ctrl_interface = 1;
 229                         break;
 230 #endif /* CONFIG_DBUS */
 231                 case 'v':
 232                         printf("%s\n", wpa_supplicant_version);
 233                         exitcode = 0;
 234                         goto out;
 235                 case 'W':
 236                         params.wait_for_monitor++;
 237                         break;
 238                 case 'N':
 239                         iface_count++;
 240                         iface = os_realloc(ifaces, iface_count *
 241                                            sizeof(struct wpa_interface));
 242                         if (iface == NULL)
 243                                 goto out;
 244                         ifaces = iface;
 245                         iface = &ifaces[iface_count - 1];
 246                         os_memset(iface, 0, sizeof(*iface));
 247                         break;
 248                 default:
 249                         usage();
 250                         exitcode = 0;
 251                         goto out;
 252                 }
 253         }
 254
 255         exitcode = 0;
 256         global = wpa_supplicant_init(&params);
 257         if (global == NULL) {
 258                 wpa_printf(MSG_ERROR, "Failed to initialize wpa_supplicant");
 259                 exitcode = -1;
 260                 goto out;
 261         }
 262
 263         for (i = 0; exitcode == 0 && i < iface_count; i++) {
 264                 if ((ifaces[i].confname == NULL &&
 265                      ifaces[i].ctrl_interface == NULL) ||
 266                     ifaces[i].ifname == NULL) {
 267                         if (iface_count == 1 && (params.ctrl_interface ||
 268                                                  params.dbus_ctrl_interface))
 269                                 break;
 270                         usage();
 271                         exitcode = -1;
 272                         break;
 273                 }
 274                 if (wpa_supplicant_add_iface(global, &ifaces[i]) == NULL)
 275                         exitcode = -1;
 276         }
 277
 278         if (exitcode == 0)
 279                 exitcode = wpa_supplicant_run(global);
 280
 281         wpa_supplicant_deinit(global);
 282
 283 out:
 284         os_free(ifaces);
 285         os_free(params.pid_file);
 286
 287         os_program_deinit();
 288
 289         return exitcode;
 290 }