android wpa_supplicant 服务启动

wpa_supplicant 服务启动：

service wpa_supplicant /system/bin/wpa_supplicant \
    -iwlan0 -Dnl80211 -c/data/misc/wifi/wpa_supplicant.conf \
    -I/system/etc/wifi/wpa_supplicant_overlay.conf \
    -O/data/misc/wifi/sockets -dd \
    -e/data/misc/wifi/entropy.bin -g@android:wpa_wlan0
    #   we will start as root and wpa_supplicant will switch to user wifi
    #   after setting up the capabilities required for WEXT
    #   user wifi
    #   group wifi inet keystore
    class main
    socket wpa_wlan0 dgram 660 wifi wifi
    disabled
    oneshot

external\wpa_supplicant_8\wpa_supplicant\main.c main函数：

int main(int argc, char *argv[])
{
	int c, i;
	struct wpa_interface *ifaces, *iface;
	int iface_count, exitcode = -1;
	struct wpa_params params;
	struct wpa_global *global;
	/*设置wpa_supplicant在android系统的一些权限，防止通过wpa_supplicant服务来获取root权限*/
	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;
	iface_count = 1;
	//输入输出重定向到 /dev/null
	wpa_supplicant_fd_workaround(1);

	for (;;) {
		c = getopt(argc, argv,
			   "b:Bc:C:D:de:f:g:G:hi:I:KLMm:No:O:p:P:qsTtuvW");
		if (c < 0)
			break;
		switch (c) {
		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;
	
	/*
		wpa_supplicant_init函数的主要功能师初始化wpa_global以及一些与整个程序相关的资源
		包括随机数资源，eloop事件循环机制以及设置消息全局回调函数。
		全局回调函数:
			wpa_supplicant_msg_ifname_cb: 用于获取网卡接口名
	*/
	// 根据传入的参数创建并初始化一个wpa_global对象
	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 (i = 0; exitcode == 0 && i < iface_count; i++) {
		struct wpa_supplicant *wpa_s;

		if ((ifaces[i].confname == NULL &&
		     ifaces[i].ctrl_interface == NULL) ||
		    ifaces[i].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;
		}
		/* WPAS支持操作多个无线网络设备，此处需将它们一一添加到WPAS中 WPAS内部将初始化这些设备 */
		wpa_s = wpa_supplicant_add_iface(global, &ifaces[i], 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;
}

struct wpa_interface ：结构体用来描述一个无线网络设备，在main函数初始化的时候使用。启动服务解析参数后保存在wpa_interface结构体中。

struct wpa_global：是一个全局性质的上下文信息。它通过ifaces变量指向一个wpa_supplicant对象，

struct wpa_supplicant：是wpa_supplicant的核心数据结构。一个interface对应一个wpa_supplicant对象。

struct ctrl_iface_global_priv：是全局控制接口的信息，内部包含一个用于通信的socket句柄。

wpa_supplicant_init函数：

**
 * wpa_supplicant_init - Initialize %wpa_supplicant
 * @params: Parameters for %wpa_supplicant
 * Returns: Pointer to global %wpa_supplicant data, or %NULL on failure
 *
 * This function is used to initialize %wpa_supplicant. After successful
 * initialization, the returned data pointer can be used to add and remove
 * network interfaces, and eventually, to deinitialize %wpa_supplicant.
 */
struct wpa_global * wpa_supplicant_init(struct wpa_params *params)
{
	struct wpa_global *global;
	int ret, i;

	if (params == NULL)
		return NULL;

#ifdef CONFIG_DRIVER_NDIS
	{
		void driver_ndis_init_ops(void);
		driver_ndis_init_ops();
	}
#endif /* CONFIG_DRIVER_NDIS */

#ifndef CONFIG_NO_WPA_MSG
	//设置全局回调函数 wpa_msg_ifname_cb = wpa_supplicant_msg_ifname_cb 
	wpa_msg_register_ifname_cb(wpa_supplicant_msg_ifname_cb);
#endif /* CONFIG_NO_WPA_MSG */
	//根据服务启动参数，决定是否开启输出日志文件
	if (params->wpa_debug_file_path)
		wpa_debug_open_file(params->wpa_debug_file_path);
	else
		wpa_debug_setup_stdout();
	if (params->wpa_debug_syslog)
		wpa_debug_open_syslog();
	if (params->wpa_debug_tracing) {
		ret = wpa_debug_open_linux_tracing();
		if (ret) {
			wpa_printf(MSG_ERROR,
				   "Failed to enable trace logging");
			return NULL;
		}
	}
	// 注册EAP方法
	ret = eap_register_methods();
	if (ret) {
		wpa_printf(MSG_ERROR, "Failed to register EAP methods");
		if (ret == -2)
			wpa_printf(MSG_ERROR, "Two or more EAP methods used "
				   "the same EAP type.");
		return NULL;
	}
	//创建一个wpa_global对象
	global = os_zalloc(sizeof(*global));
	if (global == NULL)
		return NULL;
	/* 以下为对wpa_global对象初始化*/
	dl_list_init(&global->p2p_srv_bonjour);
	dl_list_init(&global->p2p_srv_upnp);
	global->params.daemonize = params->daemonize;
	global->params.wait_for_monitor = params->wait_for_monitor;
	global->params.dbus_ctrl_interface = params->dbus_ctrl_interface;
	if (params->pid_file)
		global->params.pid_file = os_strdup(params->pid_file);
	if (params->ctrl_interface)
		global->params.ctrl_interface =
			os_strdup(params->ctrl_interface);
	if (params->ctrl_interface_group)
		global->params.ctrl_interface_group =
			os_strdup(params->ctrl_interface_group);
	if (params->override_driver)
		global->params.override_driver =
			os_strdup(params->override_driver);
	if (params->override_ctrl_interface)
		global->params.override_ctrl_interface =
			os_strdup(params->override_ctrl_interface);
#ifdef CONFIG_MATCH_IFACE
	global->params.match_iface_count = params->match_iface_count;
	if (params->match_iface_count) {
		global->params.match_ifaces =
			os_calloc(params->match_iface_count,
				  sizeof(struct wpa_interface));
		os_memcpy(global->params.match_ifaces,
			  params->match_ifaces,
			  params->match_iface_count *
			  sizeof(struct wpa_interface));
	}
#endif /* CONFIG_MATCH_IFACE */
#ifdef CONFIG_P2P
	if (params->conf_p2p_dev)
		global->params.conf_p2p_dev =
			os_strdup(params->conf_p2p_dev);
#endif /* CONFIG_P2P */
	wpa_debug_level = global->params.wpa_debug_level =
		params->wpa_debug_level;
	wpa_debug_show_keys = global->params.wpa_debug_show_keys =
		params->wpa_debug_show_keys;
	wpa_debug_timestamp = global->params.wpa_debug_timestamp =
		params->wpa_debug_timestamp;

	wpa_printf(MSG_DEBUG, "wpa_supplicant v" VERSION_STR);
	// 初始化事件循环机制
	if (eloop_init()) {
		wpa_printf(MSG_ERROR, "Failed to initialize event loop");
		wpa_supplicant_deinit(global);
		return NULL;
	}
	// 初始化随机数相关资源
	random_init(params->entropy_file);
	// 初始化全局控制接口对象，
	global->ctrl_iface = wpa_supplicant_global_ctrl_iface_init(global);
	if (global->ctrl_iface == NULL) {
		wpa_supplicant_deinit(global);
		return NULL;
	}
	// 初始化通讯机制相关资源，它和dbus有关?
	if (wpas_notify_supplicant_initialized(global)) {
		wpa_supplicant_deinit(global);
		return NULL;
	}

	for (i = 0; wpa_drivers[i]; i++)
		global->drv_count++;
	if (global->drv_count == 0) {
		wpa_printf(MSG_ERROR, "No drivers enabled");
		wpa_supplicant_deinit(global);
		return NULL;
	}
	//分配全局 driver wrapper 上下文信息数组
	global->drv_priv = os_calloc(global->drv_count, sizeof(void *));
	if (global->drv_priv == NULL) {
		wpa_supplicant_deinit(global);
		return NULL;
	}

#ifdef CONFIG_WIFI_DISPLAY
	if (wifi_display_init(global) < 0) {
		wpa_printf(MSG_ERROR, "Failed to initialize Wi-Fi Display");
		wpa_supplicant_deinit(global);
		return NULL;
	}
#endif /* CONFIG_WIFI_DISPLAY */

	eloop_register_timeout(WPA_SUPPLICANT_CLEANUP_INTERVAL, 0,
			       wpas_periodic, global, NULL);

	return global;
}

wpa_supplicant_init函数的主要功能师初始化wpa_global以及一些与整个程序相关的资源
       包括随机数资源，eloop事件循环机制以及设置消息全局回调函数。
       全局回调函数:
           wpa_supplicant_msg_ifname_cb: 用于获取网卡接口名

wpa_supplicant_init函数中的eloop_init主要功能初始化wpa_supplicant中事件驱动的核心数据结构体eloop_data。

wpa_supplicant的事件驱动机制支持5中类型event:

read event：读事件例如来自socket的可读事件；
write event: 写事件，例如来自socket的写事件；
exception event：异常事件，如果socket操作发生错误，则由错误事件处理。
timeout event：定时事件，通过select的等待超时机制来实现定时事件。
signal：信号事件，信号事件来源于kernel，wpa_supplicant允许为一些特定信号设置处理函数。

wpa_drivers数组：定义如下：

const struct wpa_driver_ops *const wpa_drivers[] =
{
#ifdef CONFIG_DRIVER_NL80211
	&wpa_driver_nl80211_ops,
#endif /* CONFIG_DRIVER_NL80211 */
#ifdef CONFIG_DRIVER_WEXT
	&wpa_driver_wext_ops,
#endif /* CONFIG_DRIVER_WEXT */
#ifdef CONFIG_DRIVER_HOSTAP
	&wpa_driver_hostap_ops,
#endif /* CONFIG_DRIVER_HOSTAP */
#ifdef CONFIG_DRIVER_BSD
	&wpa_driver_bsd_ops,
#endif /* CONFIG_DRIVER_BSD */
#ifdef CONFIG_DRIVER_OPENBSD
	&wpa_driver_openbsd_ops,
#endif /* CONFIG_DRIVER_OPENBSD */
#ifdef CONFIG_DRIVER_NDIS
	&wpa_driver_ndis_ops,
#endif /* CONFIG_DRIVER_NDIS */
#ifdef CONFIG_DRIVER_WIRED
	&wpa_driver_wired_ops,
#endif /* CONFIG_DRIVER_WIRED */
#ifdef CONFIG_DRIVER_MACSEC_QCA
	&wpa_driver_macsec_qca_ops,
#endif /* CONFIG_DRIVER_MACSEC_QCA */
#ifdef CONFIG_DRIVER_ROBOSWITCH
	&wpa_driver_roboswitch_ops,
#endif /* CONFIG_DRIVER_ROBOSWITCH */
#ifdef CONFIG_DRIVER_ATHEROS
	&wpa_driver_atheros_ops,
#endif /* CONFIG_DRIVER_ATHEROS */
#ifdef CONFIG_DRIVER_NONE
	&wpa_driver_none_ops,
#endif /* CONFIG_DRIVER_NONE */
	NULL
};

wpa_drivers数组成员指向一个wpa_driver_ops类型的对象。 wpa_driver_ops是driver i/f模块的核心数据结构。定义了很多函数指针。

wpa_driver_nl80211_ops定义：

const struct wpa_driver_ops wpa_driver_nl80211_ops = {
	.name = "nl80211", 					
	.desc = "Linux nl80211/cfg80211",   
	.get_bssid = wpa_driver_nl80211_get_bssid, 
	.get_ssid = wpa_driver_nl80211_get_ssid,   
	.set_key = driver_nl80211_set_key,
	.scan2 = driver_nl80211_scan2,
	.sched_scan = wpa_driver_nl80211_sched_scan,
	.stop_sched_scan = wpa_driver_nl80211_stop_sched_scan,
	.get_scan_results2 = wpa_driver_nl80211_get_scan_results,
	.abort_scan = wpa_driver_nl80211_abort_scan,
	.deauthenticate = driver_nl80211_deauthenticate,
	.authenticate = driver_nl80211_authenticate,
	.associate = wpa_driver_nl80211_associate,
	.global_init = nl80211_global_init,
	.global_deinit = nl80211_global_deinit,
	.init2 = wpa_driver_nl80211_init,
	.deinit = driver_nl80211_deinit,
	.get_capa = wpa_driver_nl80211_get_capa,
	.set_operstate = wpa_driver_nl80211_set_operstate,
	.set_supp_port = wpa_driver_nl80211_set_supp_port,
	.set_country = wpa_driver_nl80211_set_country,
	.get_country = wpa_driver_nl80211_get_country,
	.set_ap = wpa_driver_nl80211_set_ap,
	.set_acl = wpa_driver_nl80211_set_acl,
	.if_add = wpa_driver_nl80211_if_add,
	.if_remove = driver_nl80211_if_remove,
	.send_mlme = driver_nl80211_send_mlme,
	.get_hw_feature_data = nl80211_get_hw_feature_data,
	.sta_add = wpa_driver_nl80211_sta_add,
	.sta_remove = driver_nl80211_sta_remove,
	.hapd_send_eapol = wpa_driver_nl80211_hapd_send_eapol,
	.sta_set_flags = wpa_driver_nl80211_sta_set_flags,
	.hapd_init = i802_init,
	.hapd_deinit = i802_deinit,
	.set_wds_sta = i802_set_wds_sta,
	.get_seqnum = i802_get_seqnum,
	.flush = i802_flush,
	.get_inact_sec = i802_get_inact_sec,
	.sta_clear_stats = i802_sta_clear_stats,
	.set_rts = i802_set_rts,
	.set_frag = i802_set_frag,
	.set_tx_queue_params = i802_set_tx_queue_params,
	.set_sta_vlan = driver_nl80211_set_sta_vlan,
	.sta_deauth = i802_sta_deauth,
	.sta_disassoc = i802_sta_disassoc,
	.read_sta_data = driver_nl80211_read_sta_data,
	.set_freq = i802_set_freq,
	.send_action = driver_nl80211_send_action,
	.send_action_cancel_wait = wpa_driver_nl80211_send_action_cancel_wait,
	.remain_on_channel = wpa_driver_nl80211_remain_on_channel,
	.cancel_remain_on_channel =
	wpa_driver_nl80211_cancel_remain_on_channel,
	.probe_req_report = driver_nl80211_probe_req_report,
	.deinit_ap = wpa_driver_nl80211_deinit_ap,
	.deinit_p2p_cli = wpa_driver_nl80211_deinit_p2p_cli,
	.resume = wpa_driver_nl80211_resume,
	.signal_monitor = nl80211_signal_monitor,
	.signal_poll = nl80211_signal_poll,
	.send_frame = nl80211_send_frame,
	.set_param = nl80211_set_param,
	.get_radio_name = nl80211_get_radio_name,
	.add_pmkid = nl80211_add_pmkid,
	.remove_pmkid = nl80211_remove_pmkid,
	.flush_pmkid = nl80211_flush_pmkid,
	.set_rekey_info = nl80211_set_rekey_info,
	.poll_client = nl80211_poll_client,
	.set_p2p_powersave = nl80211_set_p2p_powersave,
	.start_dfs_cac = nl80211_start_radar_detection,
	.stop_ap = wpa_driver_nl80211_stop_ap,
#ifdef CONFIG_TDLS
	.send_tdls_mgmt = nl80211_send_tdls_mgmt,
	.tdls_oper = nl80211_tdls_oper,
	.tdls_enable_channel_switch = nl80211_tdls_enable_channel_switch,
	.tdls_disable_channel_switch = nl80211_tdls_disable_channel_switch,
#endif /* CONFIG_TDLS */
	.update_ft_ies = wpa_driver_nl80211_update_ft_ies,
	.get_mac_addr = wpa_driver_nl80211_get_macaddr,
	.get_survey = wpa_driver_nl80211_get_survey,
	.status = wpa_driver_nl80211_status,
	.switch_channel = nl80211_switch_channel,
#ifdef ANDROID_P2P
	.set_noa = wpa_driver_set_p2p_noa,
	.get_noa = wpa_driver_get_p2p_noa,
	.set_ap_wps_ie = wpa_driver_set_ap_wps_p2p_ie,
#endif /* ANDROID_P2P */
#ifdef ANDROID
#ifndef ANDROID_LIB_STUB
	.driver_cmd = wpa_driver_nl80211_driver_cmd,
#endif /* !ANDROID_LIB_STUB */
#endif /* ANDROID */
	.vendor_cmd = nl80211_vendor_cmd,
	.set_qos_map = nl80211_set_qos_map,
	.set_wowlan = nl80211_set_wowlan,
#ifdef CONFIG_DRIVER_NL80211_QCA
	.roaming = nl80211_roaming,
#endif /* CONFIG_DRIVER_NL80211_QCA */
	.set_mac_addr = nl80211_set_mac_addr,
#ifdef CONFIG_MESH
	.init_mesh = wpa_driver_nl80211_init_mesh,
	.join_mesh = wpa_driver_nl80211_join_mesh,
	.leave_mesh = wpa_driver_nl80211_leave_mesh,
#endif /* CONFIG_MESH */
	.br_add_ip_neigh = wpa_driver_br_add_ip_neigh,
	.br_delete_ip_neigh = wpa_driver_br_delete_ip_neigh,
	.br_port_set_attr = wpa_driver_br_port_set_attr,
	.br_set_net_param = wpa_driver_br_set_net_param,
	.add_tx_ts = nl80211_add_ts,
	.del_tx_ts = nl80211_del_ts,
	.get_ifindex = nl80211_get_ifindex,
#ifdef CONFIG_DRIVER_NL80211_QCA
	.do_acs = wpa_driver_do_acs,
	.set_band = nl80211_set_band,
	.get_pref_freq_list = nl80211_get_pref_freq_list,
	.set_prob_oper_freq = nl80211_set_prob_oper_freq,
	.p2p_lo_start = nl80211_p2p_lo_start,
	.p2p_lo_stop = nl80211_p2p_lo_stop,
	.set_default_scan_ies = nl80211_set_default_scan_ies,
	.set_tdls_mode = nl80211_set_tdls_mode,
#endif /* CONFIG_DRIVER_NL80211_QCA */
	.get_ext_capab = nl80211_get_ext_capab,
};

wpa_supplicant_add_iface函数：

wpa_supplicant_add_iface函数作用，向wpa_supplicant添加接口设备。对这些设备镜像初始化。

主要数据结构：

struct wpa_ssid ：用于存储某个无线网络的配置信息(如所支持的安全类型，优先等级)。它其实是wpa_supplicant.conf中无线网络配置项在代码中的反映。 conf中的network项都对应一个wpa_ssid对象。

wpa_supplicant_init_iface函数：

所先从配置文件中读取数据，保存到 wpa_config和wpa_ssid中， wpa_ssid保存的是ssid信息。

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wpa_supplicant_init函数：

wpa_supplicant_add_iface函数：

用UINT32_MAX來判斷兩個無符號數相減的大小

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