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wpa_supplicant源码剖析-main.c解析

news 来源：原创 2025/6/16 14:51:37

这里记录了 wpa_supplicant 的命令行用法



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_CTRL_IFACE_DBUS_NEW
	       "u"
#endif /* CONFIG_CTRL_IFACE_DBUS_NEW */
	       "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_CTRL_IFACE_DBUS_NEW
	       "  -u = enable DBus control interface\n"
#endif /* CONFIG_CTRL_IFACE_DBUS_NEW */
	       "  -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 */
}

这里会将 0,1,2 文件描述符指向/dev/null，相当于关闭标准输入，标准输出，标准错误