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 software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10 #ifdef __linux__
  11 #include <fcntl.h>
  12 #endif /* __linux__ */
  13
  14 #include "common.h"
  15 #include "wpa_supplicant_i.h"
  16 #include "driver_i.h"
  17
  18 extern struct wpa_driver_ops *wpa_drivers[];
  19
  20
  21 static void usage(void)
  22 {
  23         int i;
  24         printf("%s\n\n%s\n"
  25                "usage:\n"
  26                "  wpa_supplicant [-BddhKLqqstuvW] [-P<pid file>] "
  27                "[-g<global ctrl>] \\\n"
  28                "        -i<ifname> -c<config file> [-C<ctrl>] [-D<driver>] "
  29                "[-p<driver_param>] \\\n"
  30                "        [-b<br_ifname>] [-f<debug file>] [-e<entropy file>] "
  31                "\\\n"
  32                "        [-o<override driver>] [-O<override ctrl>] \\\n"
  33                "        [-N -i<ifname> -c<conf> [-C<ctrl>] "
  34                "[-D<driver>] \\\n"
  35                "        [-p<driver_param>] [-b<br_ifname>] [-I<config file>] "
  36                "...]\n"
  37                "\n"
  38                "drivers:\n",
  39                wpa_supplicant_version, wpa_supplicant_license);
  40
  41         for (i = 0; wpa_drivers[i]; i++) {
  42                 printf("  %s = %s\n",
  43                        wpa_drivers[i]->name,
  44                        wpa_drivers[i]->desc);
  45         }
  46
  47 #ifndef CONFIG_NO_STDOUT_DEBUG
  48         printf("options:\n"
  49                "  -b = optional bridge interface name\n"
  50                "  -B = run daemon in the background\n"
  51                "  -c = Configuration file\n"
  52                "  -C = ctrl_interface parameter (only used if -c is not)\n"
  53                "  -i = interface name\n"
  54                "  -I = additional configuration file\n"
  55                "  -d = increase debugging verbosity (-dd even more)\n"
  56                "  -D = driver name (can be multiple drivers: nl80211,wext)\n"
  57                "  -e = entropy file\n");
  58 #ifdef CONFIG_DEBUG_FILE
  59         printf("  -f = log output to debug file instead of stdout\n");
  60 #endif /* CONFIG_DEBUG_FILE */
  61         printf("  -g = global ctrl_interface\n"
  62                "  -K = include keys (passwords, etc.) in debug output\n");
  63 #ifdef CONFIG_DEBUG_SYSLOG
  64         printf("  -s = log output to syslog instead of stdout\n");
  65 #endif /* CONFIG_DEBUG_SYSLOG */
  66 #ifdef CONFIG_DEBUG_LINUX_TRACING
  67         printf("  -T = record to Linux tracing in addition to logging\n");
  68         printf("       (records all messages regardless of debug verbosity)\n");
  69 #endif /* CONFIG_DEBUG_LINUX_TRACING */
  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[0] ? wpa_drivers[0]->name : "nl80211");
  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(int start)
 107 {
 108 #ifdef __linux__
 109         static int fd[3] = { -1, -1, -1 };
 110         int i;
 111         /* When started from pcmcia-cs scripts, wpa_supplicant might start with
 112          * fd 0, 1, and 2 closed. This will cause some issues because many
 113          * places in wpa_supplicant are still printing out to stdout. As a
 114          * workaround, make sure that fd's 0, 1, and 2 are not used for other
 115          * sockets. */
 116         if (start) {
 117                 for (i = 0; i < 3; i++) {
 118                         fd[i] = open("/dev/null", O_RDWR);
 119                         if (fd[i] > 2) {
 120                                 close(fd[i]);
 121                                 fd[i] = -1;
 122                                 break;
 123                         }
 124                 }
 125         } else {
 126                 for (i = 0; i < 3; i++) {
 127                         if (fd[i] >= 0) {
 128                                 close(fd[i]);
 129                                 fd[i] = -1;
 130                         }
 131                 }
 132         }
 133 #endif /* __linux__ */
 134 }
 135
 136
 137 int main(int argc, char *argv[])
 138 {
 139         int c, i;
 140         struct wpa_interface *ifaces, *iface;
 141         int iface_count, exitcode = -1;
 142         struct wpa_params params;
 143         struct wpa_global *global;
 144
 145         if (os_program_init())
 146                 return -1;
 147
 148         os_memset(&params, 0, sizeof(params));
 149         params.wpa_debug_level = MSG_INFO;
 150
 151         iface = ifaces = os_zalloc(sizeof(struct wpa_interface));
 152         if (ifaces == NULL)
 153                 return -1;
 154         iface_count = 1;
 155
 156         wpa_supplicant_fd_workaround(1);
 157
 158         for (;;) {
 159                 c = getopt(argc, argv,
 160                            "b:Bc:C:D:de:f:g:hi:I:KLNo:O:p:P:qsTtuvW");
 161                 if (c < 0)
 162                         break;
 163                 switch (c) {
 164                 case 'b':
 165                         iface->bridge_ifname = optarg;
 166                         break;
 167                 case 'B':
 168                         params.daemonize++;
 169                         break;
 170                 case 'c':
 171                         iface->confname = optarg;
 172                         break;
 173                 case 'C':
 174                         iface->ctrl_interface = optarg;
 175                         break;
 176                 case 'D':
 177                         iface->driver = optarg;
 178                         break;
 179                 case 'd':
 180 #ifdef CONFIG_NO_STDOUT_DEBUG
 181                         printf("Debugging disabled with "
 182                                "CONFIG_NO_STDOUT_DEBUG=y build time "
 183                                "option.\n");
 184                         goto out;
 185 #else /* CONFIG_NO_STDOUT_DEBUG */
 186                         params.wpa_debug_level--;
 187                         break;
 188 #endif /* CONFIG_NO_STDOUT_DEBUG */
 189                 case 'e':
 190                         params.entropy_file = optarg;
 191                         break;
 192 #ifdef CONFIG_DEBUG_FILE
 193                 case 'f':
 194                         params.wpa_debug_file_path = optarg;
 195                         break;
 196 #endif /* CONFIG_DEBUG_FILE */
 197                 case 'g':
 198                         params.ctrl_interface = optarg;
 199                         break;
 200                 case 'h':
 201                         usage();
 202                         exitcode = 0;
 203                         goto out;
 204                 case 'i':
 205                         iface->ifname = optarg;
 206                         break;
 207                 case 'I':
 208                         iface->confanother = optarg;
 209                         break;
 210                 case 'K':
 211                         params.wpa_debug_show_keys++;
 212                         break;
 213                 case 'L':
 214                         license();
 215                         exitcode = 0;
 216                         goto out;
 217                 case 'o':
 218                         params.override_driver = optarg;
 219                         break;
 220                 case 'O':
 221                         params.override_ctrl_interface = optarg;
 222                         break;
 223                 case 'p':
 224                         iface->driver_param = optarg;
 225                         break;
 226                 case 'P':
 227                         os_free(params.pid_file);
 228                         params.pid_file = os_rel2abs_path(optarg);
 229                         break;
 230                 case 'q':
 231                         params.wpa_debug_level++;
 232                         break;
 233 #ifdef CONFIG_DEBUG_SYSLOG
 234                 case 's':
 235                         params.wpa_debug_syslog++;
 236                         break;
 237 #endif /* CONFIG_DEBUG_SYSLOG */
 238 #ifdef CONFIG_DEBUG_LINUX_TRACING
 239                 case 'T':
 240                         params.wpa_debug_tracing++;
 241                         break;
 242 #endif /* CONFIG_DEBUG_LINUX_TRACING */
 243                 case 't':
 244                         params.wpa_debug_timestamp++;
 245                         break;
 246 #ifdef CONFIG_DBUS
 247                 case 'u':
 248                         params.dbus_ctrl_interface = 1;
 249                         break;
 250 #endif /* CONFIG_DBUS */
 251                 case 'v':
 252                         printf("%s\n", wpa_supplicant_version);
 253                         exitcode = 0;
 254                         goto out;
 255                 case 'W':
 256                         params.wait_for_monitor++;
 257                         break;
 258                 case 'N':
 259                         iface_count++;
 260                         iface = os_realloc_array(ifaces, iface_count,
 261                                                  sizeof(struct wpa_interface));
 262                         if (iface == NULL)
 263                                 goto out;
 264                         ifaces = iface;
 265                         iface = &ifaces[iface_count - 1];
 266                         os_memset(iface, 0, sizeof(*iface));
 267                         break;
 268                 default:
 269                         usage();
 270                         exitcode = 0;
 271                         goto out;
 272                 }
 273         }
 274
 275         exitcode = 0;
 276         global = wpa_supplicant_init(&params);
 277         if (global == NULL) {
 278                 wpa_printf(MSG_ERROR, "Failed to initialize wpa_supplicant");
 279                 exitcode = -1;
 280                 goto out;
 281         } else {
 282                 wpa_printf(MSG_INFO, "Successfully initialized "
 283                            "wpa_supplicant");
 284         }
 285
 286         for (i = 0; exitcode == 0 && i < iface_count; i++) {
 287                 if ((ifaces[i].confname == NULL &&
 288                      ifaces[i].ctrl_interface == NULL) ||
 289                     ifaces[i].ifname == NULL) {
 290                         if (iface_count == 1 && (params.ctrl_interface ||
 291                                                  params.dbus_ctrl_interface))
 292                                 break;
 293                         usage();
 294                         exitcode = -1;
 295                         break;
 296                 }
 297                 if (wpa_supplicant_add_iface(global, &ifaces[i]) == NULL)
 298                         exitcode = -1;
 299         }
 300
 301         if (exitcode == 0)
 302                 exitcode = wpa_supplicant_run(global);
 303
 304         wpa_supplicant_deinit(global);
 305
 306 out:
 307         wpa_supplicant_fd_workaround(0);
 308         os_free(ifaces);
 309         os_free(params.pid_file);
 310
 311         os_program_deinit();
 312
 313         return exitcode;
 314 }