text: /*
   * WPA Supplicant / main() function for UNIX like OSes and MinGW
   * Copyright (c) 2003-2013, Jouni Malinen <j@w1.fi>
   *
   * This software may be distributed under the terms of the BSD license.
   * See README for more details.
   */
  
  #include "includes.h"
  #ifdef __linux__
  #include <fcntl.h>
  #endif /* __linux__ */
  
  #include "common.h"
  #include "fst/fst.h"
  #include "wpa_supplicant_i.h"
  #include "driver_i.h"
  #include "p2p_supplicant.h"
  
  
  static void usage(void)
  {
  	int i;
  	printf("%s\n\n%s\n"
  	       "usage:\n"
  	       "  wpa_supplicant [-BddhKLqq"
  #ifdef CONFIG_DEBUG_SYSLOG
  	       "s"
  #endif /* CONFIG_DEBUG_SYSLOG */
  	       "t"
  #ifdef CONFIG_DBUS
  	       "u"
  #endif /* CONFIG_DBUS */
  	       "vW] [-P<pid file>] "
  	       "[-g<global ctrl>] \\\n"
  	       "        [-G<group>] \\\n"
  	       "        -i<ifname> -c<config file> [-C<ctrl>] [-D<driver>] "
  	       "[-p<driver_param>] \\\n"
  	       "        [-b<br_ifname>] [-e<entropy file>]"
  #ifdef CONFIG_DEBUG_FILE
  	       " [-f<debug file>]"
  #endif /* CONFIG_DEBUG_FILE */
  	       " \\\n"
  	       "        [-o<override driver>] [-O<override ctrl>] \\\n"
  	       "        [-N -i<ifname> -c<conf> [-C<ctrl>] "
  	       "[-D<driver>] \\\n"
  #ifdef CONFIG_P2P
  	       "        [-m<P2P Device config file>] \\\n"
  #endif /* CONFIG_P2P */
  	       "        [-p<driver_param>] [-b<br_ifname>] [-I<config file>] "
  	       "...]\n"
  	       "\n"
  	       "drivers:\n",
  	       wpa_supplicant_version, wpa_supplicant_license);
  
  	for (i = 0; wpa_drivers[i]; i++) {
  		printf("  %s = %s\n",
  		       wpa_drivers[i]->name,
  		       wpa_drivers[i]->desc);
  	}
  
  #ifndef CONFIG_NO_STDOUT_DEBUG
  	printf("options:\n"
  	       "  -b = optional bridge interface name\n"
  	       "  -B = run daemon in the background\n"
  	       "  -c = Configuration file\n"
  	       "  -C = ctrl_interface parameter (only used if -c is not)\n"
  	       "  -d = increase debugging verbosity (-dd even more)\n"
  	       "  -D = driver name (can be multiple drivers: nl80211,wext)\n"
  	       "  -e = entropy file\n"
  #ifdef CONFIG_DEBUG_FILE
  	       "  -f = log output to debug file instead of stdout\n"
  #endif /* CONFIG_DEBUG_FILE */
  	       "  -g = global ctrl_interface\n"
  	       "  -G = global ctrl_interface group\n"
  	       "  -h = show this help text\n"
  	       "  -i = interface name\n"
  	       "  -I = additional configuration file\n"
  	       "  -K = include keys (passwords, etc.) in debug output\n"
  	       "  -L = show license (BSD)\n"
  #ifdef CONFIG_P2P
  	       "  -m = Configuration file for the P2P Device interface\n"
  #endif /* CONFIG_P2P */
  #ifdef CONFIG_MATCH_IFACE
  	       "  -M = start describing new matching interface\n"
  #endif /* CONFIG_MATCH_IFACE */
  	       "  -N = start describing new interface\n"
  	       "  -o = override driver parameter for new interfaces\n"
  	       "  -O = override ctrl_interface parameter for new interfaces\n"
  	       "  -p = driver parameters\n"
  	       "  -P = PID file\n"
  	       "  -q = decrease debugging verbosity (-qq even less)\n"
  #ifdef CONFIG_DEBUG_SYSLOG
  	       "  -s = log output to syslog instead of stdout\n"
  #endif /* CONFIG_DEBUG_SYSLOG */
  	       "  -t = include timestamp in debug messages\n"
  #ifdef CONFIG_DEBUG_LINUX_TRACING
  	       "  -T = record to Linux tracing in addition to logging\n"
  	       "       (records all messages regardless of debug verbosity)\n"
  #endif /* CONFIG_DEBUG_LINUX_TRACING */
  #ifdef CONFIG_DBUS
  	       "  -u = enable DBus control interface\n"
  #endif /* CONFIG_DBUS */
  	       "  -v = show version\n"
  	       "  -W = wait for a control interface monitor before starting\n");
  
  	printf("example:\n"
  	       "  wpa_supplicant -D%s -iwlan0 -c/etc/wpa_supplicant.conf\n",
  	       wpa_drivers[0] ? wpa_drivers[0]->name : "nl80211");
  #endif /* CONFIG_NO_STDOUT_DEBUG */
  }
  
  
  static void license(void)
  {
  #ifndef CONFIG_NO_STDOUT_DEBUG
  	printf("%s\n\n%s%s%s%s%s\n",
  	       wpa_supplicant_version,
  	       wpa_supplicant_full_license1,
  	       wpa_supplicant_full_license2,
  	       wpa_supplicant_full_license3,
  	       wpa_supplicant_full_license4,
  	       wpa_supplicant_full_license5);
  #endif /* CONFIG_NO_STDOUT_DEBUG */
  }
  
  
  static void wpa_supplicant_fd_workaround(int start)
  {
  #ifdef __linux__
  	static int fd[3] = { -1, -1, -1 };
  	int i;
  	/* When started from pcmcia-cs scripts, wpa_supplicant might start with
  	 * fd 0, 1, and 2 closed. This will cause some issues because many
  	 * places in wpa_supplicant are still printing out to stdout. As a
  	 * workaround, make sure that fd's 0, 1, and 2 are not used for other
  	 * sockets. */
  	if (start) {
  		for (i = 0; i < 3; i++) {
  			fd[i] = open("/dev/null", O_RDWR);
  			if (fd[i] > 2) {
  				close(fd[i]);
  				fd[i] = -1;
  				break;
  			}
  		}
  	} else {
  		for (i = 0; i < 3; i++) {
  			if (fd[i] >= 0) {
  				close(fd[i]);
  				fd[i] = -1;
  			}
  		}
  	}
  #endif /* __linux__ */
  }
  
  
  #ifdef CONFIG_MATCH_IFACE
  static int wpa_supplicant_init_match(struct wpa_global *global)
  {
  	/*
  	 * The assumption is that the first driver is the primary driver and
  	 * will handle the arrival / departure of interfaces.
  	 */
  	if (wpa_drivers[0]->global_init && !global->drv_priv[0]) {
  		global->drv_priv[0] = wpa_drivers[0]->global_init(global);
  		if (!global->drv_priv[0]) {
  			wpa_printf(MSG_ERROR,
  				   "Failed to initialize driver '%s'",
  				   wpa_drivers[0]->name);
  			return -1;
  		}
  	}
  
  	return 0;
  }
  #endif /* CONFIG_MATCH_IFACE */
  
  
  int main(int argc, char *argv[])
  {
  	int cmd;
  	struct wpa_interface *ifaces, *iface;
  	unsigned int iface_count = 1;
  	int exitcode = -1;
  	struct wpa_params params;
  	struct wpa_global *global;
  
  	if (os_program_init())
  		return -1;
  
  	os_memset(&params, 0, sizeof(params));
  	params.wpa_debug_level = MSG_INFO;
  
  	iface = ifaces = os_zalloc(sizeof(struct wpa_interface));
  	if (ifaces == NULL)
  		return -1;
  
  	wpa_supplicant_fd_workaround(1);
  
  	for (;;) {
  		cmd = getopt(argc, argv,
  			   "b:Bc:C:D:de:f:g:G:hi:I:KLMm:No:O:p:P:qsTtuvW");
  		if (cmd < 0)
  			break;
  		switch (cmd) {
  		case 'b':
  			iface->bridge_ifname = optarg;
  			break;
  		case 'B':
  			params.daemonize++;
  			break;
  		case 'c':
  			iface->confname = optarg;
  			break;
  		case 'C':
  			iface->ctrl_interface = optarg;
  			break;
  		case 'D':
  			iface->driver = optarg;
  			break;
  		case 'd':
  #ifdef CONFIG_NO_STDOUT_DEBUG
  			printf("Debugging disabled with "
  			       "CONFIG_NO_STDOUT_DEBUG=y build time "
  			       "option.\n");
  			goto out;
  #else /* CONFIG_NO_STDOUT_DEBUG */
  			params.wpa_debug_level--;
  			break;
  #endif /* CONFIG_NO_STDOUT_DEBUG */
  		case 'e':
  			params.entropy_file = optarg;
  			break;
  #ifdef CONFIG_DEBUG_FILE
  		case 'f':
  			params.wpa_debug_file_path = optarg;
  			break;
  #endif /* CONFIG_DEBUG_FILE */
  		case 'g':
  			params.ctrl_interface = optarg;
  			break;
  		case 'G':
  			params.ctrl_interface_group = optarg;
  			break;
  		case 'h':
  			usage();
  			exitcode = 0;
  			goto out;
  		case 'i':
  			iface->ifname = optarg;
  			break;
  		case 'I':
  			iface->confanother = optarg;
  			break;
  		case 'K':
  			params.wpa_debug_show_keys++;
  			break;
  		case 'L':
  			license();
  			exitcode = 0;
  			goto out;
  #ifdef CONFIG_P2P
  		case 'm':
  			params.conf_p2p_dev = optarg;
  			break;
  #endif /* CONFIG_P2P */
  		case 'o':
  			params.override_driver = optarg;
  			break;
  		case 'O':
  			params.override_ctrl_interface = optarg;
  			break;
  		case 'p':
  			iface->driver_param = optarg;
  			break;
  		case 'P':
  			os_free(params.pid_file);
  			params.pid_file = os_rel2abs_path(optarg);
  			break;
  		case 'q':
  			params.wpa_debug_level++;
  			break;
  #ifdef CONFIG_DEBUG_SYSLOG
  		case 's':
  			params.wpa_debug_syslog++;
  			break;
  #endif /* CONFIG_DEBUG_SYSLOG */
  #ifdef CONFIG_DEBUG_LINUX_TRACING
  		case 'T':
  			params.wpa_debug_tracing++;
  			break;
  #endif /* CONFIG_DEBUG_LINUX_TRACING */
  		case 't':
  			params.wpa_debug_timestamp++;
  			break;
  #ifdef CONFIG_DBUS
  		case 'u':
  			params.dbus_ctrl_interface = 1;
  			break;
  #endif /* CONFIG_DBUS */
  		case 'v':
  			printf("%s\n", wpa_supplicant_version);
  			exitcode = 0;
  			goto out;
  		case 'W':
  			params.wait_for_monitor++;
  			break;
  #ifdef CONFIG_MATCH_IFACE
  		case 'M':
  			params.match_iface_count++;
  			iface = os_realloc_array(params.match_ifaces,
  						 params.match_iface_count,
  						 sizeof(struct wpa_interface));
  			if (!iface)
  				goto out;
  			params.match_ifaces = iface;
  			iface = &params.match_ifaces[params.match_iface_count -
  						     1];
  			os_memset(iface, 0, sizeof(*iface));
  			break;
  #endif /* CONFIG_MATCH_IFACE */
  		case 'N':
  			iface_count++;
  			iface = os_realloc_array(ifaces, iface_count,
  						 sizeof(struct wpa_interface));
  			if (iface == NULL)
  				goto out;
  			ifaces = iface;
  			iface = &ifaces[iface_count - 1];
  			os_memset(iface, 0, sizeof(*iface));
  			break;
  		default:
  			usage();
  			exitcode = 0;
  			goto out;
  		}
  	}
  
  	exitcode = 0;
  	global = wpa_supplicant_init(&params);
  	if (global == NULL) {
  		wpa_printf(MSG_ERROR, "Failed to initialize wpa_supplicant");
  		exitcode = -1;
  		goto out;
  	} else {
  		wpa_printf(MSG_INFO, "Successfully initialized "
  			   "wpa_supplicant");
  	}
  
  	if (fst_global_init()) {
  		wpa_printf(MSG_ERROR, "Failed to initialize FST");
  		exitcode = -1;
  		goto out;
  	}
  
  #if defined(CONFIG_FST) && defined(CONFIG_CTRL_IFACE)
  	if (!fst_global_add_ctrl(fst_ctrl_cli))
  		wpa_printf(MSG_WARNING, "Failed to add CLI FST ctrl");
  #endif
  
  	for (unsigned int idx = 0; exitcode == 0 && idx < iface_count; idx++) {
  		struct wpa_supplicant *wpa_s;
  
  		if ((ifaces[idx].confname == NULL &&
  		     ifaces[idx].ctrl_interface == NULL) ||
  		    ifaces[idx].ifname == NULL) {
  			if (iface_count == 1 && (params.ctrl_interface ||
  #ifdef CONFIG_MATCH_IFACE
  						 params.match_iface_count ||
  #endif /* CONFIG_MATCH_IFACE */
  						 params.dbus_ctrl_interface))
  				break;
  			usage();
  			exitcode = -1;
  			break;
  		}
  		wpa_s = wpa_supplicant_add_iface(global, &ifaces[idx], NULL);
  		if (wpa_s == NULL) {
  			exitcode = -1;
  			break;
  		}
  	}
  
  #ifdef CONFIG_MATCH_IFACE
  	if (exitcode == 0)
  		exitcode = wpa_supplicant_init_match(global);
  #endif /* CONFIG_MATCH_IFACE */
  
  	if (exitcode == 0)
  		exitcode = wpa_supplicant_run(global);
  
  	wpa_supplicant_deinit(global);
  
  	fst_global_deinit();
  
  out:
  	wpa_supplicant_fd_workaround(0);
  	os_free(ifaces);
  #ifdef CONFIG_MATCH_IFACE
  	os_free(params.match_ifaces);
  #endif /* CONFIG_MATCH_IFACE */
  	os_free(params.pid_file);
  
  	os_program_deinit();
  
  	return exitcode;
  }
  