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>] ...]\n"
  36                "\n"
  37                "drivers:\n",
  38                wpa_supplicant_version, wpa_supplicant_license);
  39
  40         for (i = 0; wpa_drivers[i]; i++) {
  41                 printf("  %s = %s\n",
  42                        wpa_drivers[i]->name,
  43                        wpa_drivers[i]->desc);
  44         }
  45
  46 #ifndef CONFIG_NO_STDOUT_DEBUG
  47         printf("options:\n"
  48                "  -b = optional bridge interface name\n"
  49                "  -B = run daemon in the background\n"
  50                "  -c = Configuration file\n"
  51                "  -C = ctrl_interface parameter (only used if -c is not)\n"
  52                "  -i = interface name\n"
  53                "  -d = increase debugging verbosity (-dd even more)\n"
  54                "  -D = driver name (can be multiple drivers: nl80211,wext)\n"
  55                "  -e = entropy file\n");
  56 #ifdef CONFIG_DEBUG_FILE
  57         printf("  -f = log output to debug file instead of stdout\n");
  58 #endif /* CONFIG_DEBUG_FILE */
  59         printf("  -g = global ctrl_interface\n"
  60                "  -K = include keys (passwords, etc.) in debug output\n");
  61 #ifdef CONFIG_DEBUG_SYSLOG
  62         printf("  -s = log output to syslog instead of stdout\n");
  63 #endif /* CONFIG_DEBUG_SYSLOG */
  64 #ifdef CONFIG_DEBUG_LINUX_TRACING
  65         printf("  -T = record to Linux tracing in addition to logging\n");
  66         printf("       (records all messages regardless of debug verbosity)\n");
  67 #endif /* CONFIG_DEBUG_LINUX_TRACING */
  68         printf("  -t = include timestamp in debug messages\n"
  69                "  -h = show this help text\n"
  70                "  -L = show license (BSD)\n"
  71                "  -o = override driver parameter for new interfaces\n"
  72                "  -O = override ctrl_interface parameter for new interfaces\n"
  73                "  -p = driver parameters\n"
  74                "  -P = PID file\n"
  75                "  -q = decrease debugging verbosity (-qq even less)\n");
  76 #ifdef CONFIG_DBUS
  77         printf("  -u = enable DBus control interface\n");
  78 #endif /* CONFIG_DBUS */
  79         printf("  -v = show version\n"
  80                "  -W = wait for a control interface monitor before starting\n"
  81                "  -N = start describing new interface\n");
  82
  83         printf("example:\n"
  84                "  wpa_supplicant -D%s -iwlan0 -c/etc/wpa_supplicant.conf\n",
  85                wpa_drivers[i] ? wpa_drivers[i]->name : "wext");
  86 #endif /* CONFIG_NO_STDOUT_DEBUG */
  87 }
  88
  89
  90 static void license(void)
  91 {
  92 #ifndef CONFIG_NO_STDOUT_DEBUG
  93         printf("%s\n\n%s%s%s%s%s\n",
  94                wpa_supplicant_version,
  95                wpa_supplicant_full_license1,
  96                wpa_supplicant_full_license2,
  97                wpa_supplicant_full_license3,
  98                wpa_supplicant_full_license4,
  99                wpa_supplicant_full_license5);
 100 #endif /* CONFIG_NO_STDOUT_DEBUG */
 101 }
 102
 103
 104 static void wpa_supplicant_fd_workaround(int start)
 105 {
 106 #ifdef __linux__
 107         static int fd[3] = { -1, -1, -1 };
 108         int i;
 109         /* When started from pcmcia-cs scripts, wpa_supplicant might start with
 110          * fd 0, 1, and 2 closed. This will cause some issues because many
 111          * places in wpa_supplicant are still printing out to stdout. As a
 112          * workaround, make sure that fd's 0, 1, and 2 are not used for other
 113          * sockets. */
 114         if (start) {
 115                 for (i = 0; i < 3; i++) {
 116                         fd[i] = open("/dev/null", O_RDWR);
 117                         if (fd[i] > 2) {
 118                                 close(fd[i]);
 119                                 fd[i] = -1;
 120                                 break;
 121                         }
 122                 }
 123         } else {
 124                 for (i = 0; i < 3; i++) {
 125                         if (fd[i] >= 0) {
 126                                 close(fd[i]);
 127                                 fd[i] = -1;
 128                         }
 129                 }
 130         }
 131 #endif /* __linux__ */
 132 }
 133
 134
 135 int main(int argc, char *argv[])
 136 {
 137         int c, i;
 138         struct wpa_interface *ifaces, *iface;
 139         int iface_count, exitcode = -1;
 140         struct wpa_params params;
 141         struct wpa_global *global;
 142
 143         if (os_program_init())
 144                 return -1;
 145
 146         os_memset(&params, 0, sizeof(params));
 147         params.wpa_debug_level = MSG_INFO;
 148
 149         iface = ifaces = os_zalloc(sizeof(struct wpa_interface));
 150         if (ifaces == NULL)
 151                 return -1;
 152         iface_count = 1;
 153
 154         wpa_supplicant_fd_workaround(1);
 155
 156         for (;;) {
 157                 c = getopt(argc, argv,
 158                            "b:Bc:C:D:de:f:g:hi:KLNo:O:p:P:qsTtuvW");
 159                 if (c < 0)
 160                         break;
 161                 switch (c) {
 162                 case 'b':
 163                         iface->bridge_ifname = optarg;
 164                         break;
 165                 case 'B':
 166                         params.daemonize++;
 167                         break;
 168                 case 'c':
 169                         iface->confname = optarg;
 170                         break;
 171                 case 'C':
 172                         iface->ctrl_interface = optarg;
 173                         break;
 174                 case 'D':
 175                         iface->driver = optarg;
 176                         break;
 177                 case 'd':
 178 #ifdef CONFIG_NO_STDOUT_DEBUG
 179                         printf("Debugging disabled with "
 180                                "CONFIG_NO_STDOUT_DEBUG=y build time "
 181                                "option.\n");
 182                         goto out;
 183 #else /* CONFIG_NO_STDOUT_DEBUG */
 184                         params.wpa_debug_level--;
 185                         break;
 186 #endif /* CONFIG_NO_STDOUT_DEBUG */
 187                 case 'e':
 188                         params.entropy_file = optarg;
 189                         break;
 190 #ifdef CONFIG_DEBUG_FILE
 191                 case 'f':
 192                         params.wpa_debug_file_path = optarg;
 193                         break;
 194 #endif /* CONFIG_DEBUG_FILE */
 195                 case 'g':
 196                         params.ctrl_interface = optarg;
 197                         break;
 198                 case 'h':
 199                         usage();
 200                         exitcode = 0;
 201                         goto out;
 202                 case 'i':
 203                         iface->ifname = optarg;
 204                         break;
 205                 case 'K':
 206                         params.wpa_debug_show_keys++;
 207                         break;
 208                 case 'L':
 209                         license();
 210                         exitcode = 0;
 211                         goto out;
 212                 case 'o':
 213                         params.override_driver = optarg;
 214                         break;
 215                 case 'O':
 216                         params.override_ctrl_interface = optarg;
 217                         break;
 218                 case 'p':
 219                         iface->driver_param = optarg;
 220                         break;
 221                 case 'P':
 222                         os_free(params.pid_file);
 223                         params.pid_file = os_rel2abs_path(optarg);
 224                         break;
 225                 case 'q':
 226                         params.wpa_debug_level++;
 227                         break;
 228 #ifdef CONFIG_DEBUG_SYSLOG
 229                 case 's':
 230                         params.wpa_debug_syslog++;
 231                         break;
 232 #endif /* CONFIG_DEBUG_SYSLOG */
 233 #ifdef CONFIG_DEBUG_LINUX_TRACING
 234                 case 'T':
 235                         params.wpa_debug_tracing++;
 236                         break;
 237 #endif /* CONFIG_DEBUG_LINUX_TRACING */
 238                 case 't':
 239                         params.wpa_debug_timestamp++;
 240                         break;
 241 #ifdef CONFIG_DBUS
 242                 case 'u':
 243                         params.dbus_ctrl_interface = 1;
 244                         break;
 245 #endif /* CONFIG_DBUS */
 246                 case 'v':
 247                         printf("%s\n", wpa_supplicant_version);
 248                         exitcode = 0;
 249                         goto out;
 250                 case 'W':
 251                         params.wait_for_monitor++;
 252                         break;
 253                 case 'N':
 254                         iface_count++;
 255                         iface = os_realloc_array(ifaces, iface_count,
 256                                                  sizeof(struct wpa_interface));
 257                         if (iface == NULL)
 258                                 goto out;
 259                         ifaces = iface;
 260                         iface = &ifaces[iface_count - 1];
 261                         os_memset(iface, 0, sizeof(*iface));
 262                         break;
 263                 default:
 264                         usage();
 265                         exitcode = 0;
 266                         goto out;
 267                 }
 268         }
 269
 270         exitcode = 0;
 271         global = wpa_supplicant_init(&params);
 272         if (global == NULL) {
 273                 wpa_printf(MSG_ERROR, "Failed to initialize wpa_supplicant");
 274                 exitcode = -1;
 275                 goto out;
 276         } else {
 277                 wpa_printf(MSG_INFO, "Successfully initialized "
 278                            "wpa_supplicant");
 279         }
 280
 281         for (i = 0; exitcode == 0 && i < iface_count; i++) {
 282                 if ((ifaces[i].confname == NULL &&
 283                      ifaces[i].ctrl_interface == NULL) ||
 284                     ifaces[i].ifname == NULL) {
 285                         if (iface_count == 1 && (params.ctrl_interface ||
 286                                                  params.dbus_ctrl_interface))
 287                                 break;
 288                         usage();
 289                         exitcode = -1;
 290                         break;
 291                 }
 292                 if (wpa_supplicant_add_iface(global, &ifaces[i]) == NULL)
 293                         exitcode = -1;
 294         }
 295
 296         if (exitcode == 0)
 297                 exitcode = wpa_supplicant_run(global);
 298
 299         wpa_supplicant_deinit(global);
 300
 301 out:
 302         wpa_supplicant_fd_workaround(0);
 303         os_free(ifaces);
 304         os_free(params.pid_file);
 305
 306         os_program_deinit();
 307
 308         return exitcode;
 309 }