wpa_supplicant/ctrl_iface_udp.c - third_party/hostap - Git at Google

 /*
  * WPA Supplicant / UDP socket -based control interface
  * Copyright (c) 2004-2005, 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"

 #include "common.h"
 #include "eloop.h"
 #include "config.h"
 #include "eapol_supp/eapol_supp_sm.h"
 #include "wpa_supplicant_i.h"
 #include "ctrl_iface.h"
 #include "common/wpa_ctrl.h"


 #define COOKIE_LEN 8

 /* Per-interface ctrl_iface */

 /**
  * struct wpa_ctrl_dst - Internal data structure of control interface monitors
  *
  * This structure is used to store information about registered control
  * interface monitors into struct wpa_supplicant. This data is private to
  * ctrl_iface_udp.c and should not be touched directly from other files.
  */
 struct wpa_ctrl_dst {
 	struct wpa_ctrl_dst *next;
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	struct sockaddr_in6 addr;
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	struct sockaddr_in addr;
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	socklen_t addrlen;
 	int debug_level;
 	int errors;
 };


 struct ctrl_iface_priv {
 	struct wpa_supplicant *wpa_s;
 	int sock;
 	struct wpa_ctrl_dst *ctrl_dst;
 	u8 cookie[COOKIE_LEN];
 };


 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 					   int level, const char *buf,
 					   size_t len);


 static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 					    struct sockaddr_in6 *from,
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 					    struct sockaddr_in *from,
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 					    socklen_t fromlen)
 {
 	struct wpa_ctrl_dst *dst;
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	char addr[INET6_ADDRSTRLEN];
 #endif /* CONFIG_UDP_IPV6 */

 	dst = os_zalloc(sizeof(*dst));
 	if (dst == NULL)
 		return -1;
 	os_memcpy(&dst->addr, from, sizeof(*from));
 	dst->addrlen = fromlen;
 	dst->debug_level = MSG_INFO;
 	dst->next = priv->ctrl_dst;
 	priv->ctrl_dst = dst;
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
 		   inet_ntop(AF_INET6, &from->sin6_addr, addr, sizeof(*from)),
 		   ntohs(from->sin6_port));
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
 		   inet_ntoa(from->sin_addr), ntohs(from->sin_port));
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	return 0;
 }


 static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 					    struct sockaddr_in6 *from,
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 					    struct sockaddr_in *from,
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 					    socklen_t fromlen)
 {
 	struct wpa_ctrl_dst *dst, *prev = NULL;
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	char addr[INET6_ADDRSTRLEN];
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */

 	dst = priv->ctrl_dst;
 	while (dst) {
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 		if (from->sin6_port == dst->addr.sin6_port &&
 		    !os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
 			       sizeof(from->sin6_addr))) {
 			wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached %s:%d",
 				   inet_ntop(AF_INET6, &from->sin6_addr, addr,
 					     sizeof(*from)),
 				   ntohs(from->sin6_port));
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 		if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
 		    from->sin_port == dst->addr.sin_port) {
 			wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached "
 				   "%s:%d", inet_ntoa(from->sin_addr),
 				   ntohs(from->sin_port));
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 			if (prev == NULL)
 				priv->ctrl_dst = dst->next;
 			else
 				prev->next = dst->next;
 			os_free(dst);
 			return 0;
 		}
 		prev = dst;
 		dst = dst->next;
 	}
 	return -1;
 }


 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 					   struct sockaddr_in6 *from,
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 					   struct sockaddr_in *from,
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 					   socklen_t fromlen,
 					   char *level)
 {
 	struct wpa_ctrl_dst *dst;
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	char addr[INET6_ADDRSTRLEN];
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */

 	wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);

 	dst = priv->ctrl_dst;
 	while (dst) {
 #if CONFIG_CTRL_IFACE_UDP_IPV6
 		if (from->sin6_port == dst->addr.sin6_port &&
 		    !os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
 			       sizeof(from->sin6_addr))) {
 			wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor level %s:%d",
 				   inet_ntop(AF_INET6, &from->sin6_addr, addr,
 					     sizeof(*from)),
 				   ntohs(from->sin6_port));
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 		if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
 		    from->sin_port == dst->addr.sin_port) {
 			wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor "
 				   "level %s:%d", inet_ntoa(from->sin_addr),
 				   ntohs(from->sin_port));
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 			dst->debug_level = atoi(level);
 			return 0;
 		}
 		dst = dst->next;
 	}

 	return -1;
 }


 static char *
 wpa_supplicant_ctrl_iface_get_cookie(struct ctrl_iface_priv *priv,
 				     size_t *reply_len)
 {
 	char *reply;
 	reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
 	if (reply == NULL) {
 		*reply_len = 1;
 		return NULL;
 	}

 	os_memcpy(reply, "COOKIE=", 7);
 	wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
 			 priv->cookie, COOKIE_LEN);

 	*reply_len = 7 + 2 * COOKIE_LEN;
 	return reply;
 }


 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 					      void *sock_ctx)
 {
 	struct wpa_supplicant *wpa_s = eloop_ctx;
 	struct ctrl_iface_priv *priv = sock_ctx;
 	char buf[256], *pos;
 	int res;
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	struct sockaddr_in6 from;
 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 	char addr[INET6_ADDRSTRLEN];
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	struct sockaddr_in from;
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	socklen_t fromlen = sizeof(from);
 	char *reply = NULL;
 	size_t reply_len = 0;
 	int new_attached = 0;
 	u8 cookie[COOKIE_LEN];

 	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 		       (struct sockaddr *) &from, &fromlen);
 	if (res < 0) {
 		wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
 			   strerror(errno));
 		return;
 	}

 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	inet_ntop(AF_INET6, &from.sin6_addr, addr, sizeof(from));
 	if (os_strcmp(addr, "::1")) {
 		wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected source %s",
 			   addr);
 	}
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
 		/*
 		 * The OS networking stack is expected to drop this kind of
 		 * frames since the socket is bound to only localhost address.
 		 * Just in case, drop the frame if it is coming from any other
 		 * address.
 		 */
 		wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
 			   "source %s", inet_ntoa(from.sin_addr));
 		return;
 	}
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */

 	buf[res] = '\0';

 	if (os_strcmp(buf, "GET_COOKIE") == 0) {
 		reply = wpa_supplicant_ctrl_iface_get_cookie(priv, &reply_len);
 		goto done;
 	}

 	/*
 	 * Require that the client includes a prefix with the 'cookie' value
 	 * fetched with GET_COOKIE command. This is used to verify that the
 	 * client has access to a bidirectional link over UDP in order to
 	 * avoid attacks using forged localhost IP address even if the OS does
 	 * not block such frames from remote destinations.
 	 */
 	if (os_strncmp(buf, "COOKIE=", 7) != 0) {
 		wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
 			   "drop request");
 		return;
 	}

 	if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
 		wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
 			   "request - drop request");
 		return;
 	}

 	if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
 		wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
 			   "drop request");
 		return;
 	}

 	pos = buf + 7 + 2 * COOKIE_LEN;
 	while (*pos == ' ')
 		pos++;

 	if (os_strcmp(pos, "ATTACH") == 0) {
 		if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
 			reply_len = 1;
 		else {
 			new_attached = 1;
 			reply_len = 2;
 		}
 	} else if (os_strcmp(pos, "DETACH") == 0) {
 		if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
 			reply_len = 1;
 		else
 			reply_len = 2;
 	} else if (os_strncmp(pos, "LEVEL ", 6) == 0) {
 		if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
 						    pos + 6))
 			reply_len = 1;
 		else
 			reply_len = 2;
 	} else {
 		reply = wpa_supplicant_ctrl_iface_process(wpa_s, pos,
 							  &reply_len);
 	}

  done:
 	if (reply) {
 		sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 		       fromlen);
 		os_free(reply);
 	} else if (reply_len == 1) {
 		sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 		       fromlen);
 	} else if (reply_len == 2) {
 		sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
 		       fromlen);
 	}

 	if (new_attached)
 		eapol_sm_notify_ctrl_attached(wpa_s->eapol);
 }


 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
 					     enum wpa_msg_type type,
 					     const char *txt, size_t len)
 {
 	struct wpa_supplicant *wpa_s = ctx;
 	if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
 		return;
 	wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
 }


 struct ctrl_iface_priv *
 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 {
 	struct ctrl_iface_priv *priv;
 	int port = WPA_CTRL_IFACE_PORT;
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	struct sockaddr_in6 addr;
 	int domain = PF_INET6;
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	struct sockaddr_in addr;
 	int domain = PF_INET;
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */

 	priv = os_zalloc(sizeof(*priv));
 	if (priv == NULL)
 		return NULL;
 	priv->wpa_s = wpa_s;
 	priv->sock = -1;
 	os_get_random(priv->cookie, COOKIE_LEN);

 	if (wpa_s->conf->ctrl_interface == NULL)
 		return priv;

 	priv->sock = socket(domain, SOCK_DGRAM, 0);
 	if (priv->sock < 0) {
 		wpa_printf(MSG_ERROR, "socket(PF_INET): %s", strerror(errno));
 		goto fail;
 	}

 	os_memset(&addr, 0, sizeof(addr));
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	addr.sin6_family = AF_INET6;
 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 	addr.sin6_addr = in6addr_any;
 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 	inet_pton(AF_INET6, "::1", &addr.sin6_addr);
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	addr.sin_family = AF_INET;
 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 	addr.sin_addr.s_addr = INADDR_ANY;
 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 	addr.sin_addr.s_addr = htonl((127 << 24) | 1);
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 try_again:
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	addr.sin6_port = htons(port);
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	addr.sin_port = htons(port);
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 		port--;
 		if ((WPA_CTRL_IFACE_PORT - port) < WPA_CTRL_IFACE_PORT_LIMIT)
 			goto try_again;
 		wpa_printf(MSG_ERROR, "bind(AF_INET): %s", strerror(errno));
 		goto fail;
 	}

 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 	wpa_msg(wpa_s, MSG_DEBUG, "ctrl_iface_init UDP port: %d", port);
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */

 	eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 				 wpa_s, priv);
 	wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);

 	return priv;

 fail:
 	if (priv->sock >= 0)
 		close(priv->sock);
 	os_free(priv);
 	return NULL;
 }


 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 {
 	struct wpa_ctrl_dst *dst, *prev;

 	if (priv->sock > -1) {
 		eloop_unregister_read_sock(priv->sock);
 		if (priv->ctrl_dst) {
 			/*
 			 * Wait before closing the control socket if
 			 * there are any attached monitors in order to allow
 			 * them to receive any pending messages.
 			 */
 			wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 				   "monitors to receive messages");
 			os_sleep(0, 100000);
 		}
 		close(priv->sock);
 		priv->sock = -1;
 	}

 	dst = priv->ctrl_dst;
 	while (dst) {
 		prev = dst;
 		dst = dst->next;
 		os_free(prev);
 	}
 	os_free(priv);
 }


 static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
 					   int level, const char *buf,
 					   size_t len)
 {
 	struct wpa_ctrl_dst *dst, *next;
 	char levelstr[10];
 	int idx;
 	char *sbuf;
 	int llen;
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 	char addr[INET6_ADDRSTRLEN];
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */

 	dst = priv->ctrl_dst;
 	if (priv->sock < 0 || dst == NULL)
 		return;

 	os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);

 	llen = os_strlen(levelstr);
 	sbuf = os_malloc(llen + len);
 	if (sbuf == NULL)
 		return;

 	os_memcpy(sbuf, levelstr, llen);
 	os_memcpy(sbuf + llen, buf, len);

 	idx = 0;
 	while (dst) {
 		next = dst->next;
 		if (level >= dst->debug_level) {
 #ifdef CONFIG_CTRL_IFACE_UDP_IPV6
 			wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
 				   inet_ntop(AF_INET6, &dst->addr.sin6_addr,
 					     addr, sizeof(dst->addr)),
 				   ntohs(dst->addr.sin6_port));
 #else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 			wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
 				   inet_ntoa(dst->addr.sin_addr),
 				   ntohs(dst->addr.sin_port));
 #endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
 			if (sendto(priv->sock, sbuf, llen + len, 0,
 				   (struct sockaddr *) &dst->addr,
 				   sizeof(dst->addr)) < 0) {
 				wpa_printf(MSG_ERROR,
 					   "sendto(CTRL_IFACE monitor): %s",
 					   strerror(errno));
 				dst->errors++;
 				if (dst->errors > 10) {
 					wpa_supplicant_ctrl_iface_detach(
 						priv, &dst->addr,
 						dst->addrlen);
 				}
 			} else
 				dst->errors = 0;
 		}
 		idx++;
 		dst = next;
 	}
 	os_free(sbuf);
 }


 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 {
 	wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor",
 		   priv->wpa_s->ifname);
 	eloop_wait_for_read_sock(priv->sock);
 }


 /* Global ctrl_iface */

 struct ctrl_iface_global_priv {
 	int sock;
 	u8 cookie[COOKIE_LEN];
 };


 static char *
 wpa_supplicant_global_get_cookie(struct ctrl_iface_global_priv *priv,
 				 size_t *reply_len)
 {
 	char *reply;
 	reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
 	if (reply == NULL) {
 		*reply_len = 1;
 		return NULL;
 	}

 	os_memcpy(reply, "COOKIE=", 7);
 	wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
 			 priv->cookie, COOKIE_LEN);

 	*reply_len = 7 + 2 * COOKIE_LEN;
 	return reply;
 }


 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 						     void *sock_ctx)
 {
 	struct wpa_global *global = eloop_ctx;
 	struct ctrl_iface_global_priv *priv = sock_ctx;
 	char buf[256], *pos;
 	int res;
 	struct sockaddr_in from;
 	socklen_t fromlen = sizeof(from);
 	char *reply;
 	size_t reply_len;
 	u8 cookie[COOKIE_LEN];

 	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 		       (struct sockaddr *) &from, &fromlen);
 	if (res < 0) {
 		wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
 			   strerror(errno));
 		return;
 	}

 #ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
 	if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
 		/*
 		 * The OS networking stack is expected to drop this kind of
 		 * frames since the socket is bound to only localhost address.
 		 * Just in case, drop the frame if it is coming from any other
 		 * address.
 		 */
 		wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
 			   "source %s", inet_ntoa(from.sin_addr));
 		return;
 	}
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */

 	buf[res] = '\0';

 	if (os_strcmp(buf, "GET_COOKIE") == 0) {
 		reply = wpa_supplicant_global_get_cookie(priv, &reply_len);
 		goto done;
 	}

 	if (os_strncmp(buf, "COOKIE=", 7) != 0) {
 		wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
 			   "drop request");
 		return;
 	}

 	if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
 		wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
 			   "request - drop request");
 		return;
 	}

 	if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
 		wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
 			   "drop request");
 		return;
 	}

 	pos = buf + 7 + 2 * COOKIE_LEN;
 	while (*pos == ' ')
 		pos++;

 	reply = wpa_supplicant_global_ctrl_iface_process(global, pos,
 							 &reply_len);

  done:
 	if (reply) {
 		sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
 		       fromlen);
 		os_free(reply);
 	} else if (reply_len) {
 		sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
 		       fromlen);
 	}
 }


 struct ctrl_iface_global_priv *
 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 {
 	struct ctrl_iface_global_priv *priv;
 	struct sockaddr_in addr;
 	int port = WPA_GLOBAL_CTRL_IFACE_PORT;

 	priv = os_zalloc(sizeof(*priv));
 	if (priv == NULL)
 		return NULL;
 	priv->sock = -1;
 	os_get_random(priv->cookie, COOKIE_LEN);

 	if (global->params.ctrl_interface == NULL)
 		return priv;

 	wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 		   global->params.ctrl_interface);

 	priv->sock = socket(PF_INET, SOCK_DGRAM, 0);
 	if (priv->sock < 0) {
 		wpa_printf(MSG_ERROR, "socket(PF_INET): %s", strerror(errno));
 		goto fail;
 	}

 	os_memset(&addr, 0, sizeof(addr));
 	addr.sin_family = AF_INET;
 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 	addr.sin_addr.s_addr = INADDR_ANY;
 #else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 	addr.sin_addr.s_addr = htonl((127 << 24) | 1);
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
 try_again:
 	addr.sin_port = htons(port);
 	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 		port++;
 		if ((port - WPA_GLOBAL_CTRL_IFACE_PORT) <
 		    WPA_GLOBAL_CTRL_IFACE_PORT_LIMIT)
 			goto try_again;
 		wpa_printf(MSG_ERROR, "bind(AF_INET): %s", strerror(errno));
 		goto fail;
 	}

 #ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
 	wpa_printf(MSG_DEBUG, "global_ctrl_iface_init UDP port: %d", port);
 #endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */

 	eloop_register_read_sock(priv->sock,
 				 wpa_supplicant_global_ctrl_iface_receive,
 				 global, priv);

 	return priv;

 fail:
 	if (priv->sock >= 0)
 		close(priv->sock);
 	os_free(priv);
 	return NULL;
 }


 void
 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 {
 	if (priv->sock >= 0) {
 		eloop_unregister_read_sock(priv->sock);
 		close(priv->sock);
 	}
 	os_free(priv);
 }
	/*
	* WPA Supplicant / UDP socket -based control interface
	* Copyright (c) 2004-2005, 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"

	#include "common.h"
	#include "eloop.h"
	#include "config.h"
	#include "eapol_supp/eapol_supp_sm.h"
	#include "wpa_supplicant_i.h"
	#include "ctrl_iface.h"
	#include "common/wpa_ctrl.h"


	#define COOKIE_LEN 8

	/* Per-interface ctrl_iface */

	/**
	* struct wpa_ctrl_dst - Internal data structure of control interface monitors
	*
	* This structure is used to store information about registered control
	* interface monitors into struct wpa_supplicant. This data is private to
	* ctrl_iface_udp.c and should not be touched directly from other files.
	*/
	struct wpa_ctrl_dst {
	struct wpa_ctrl_dst *next;
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	struct sockaddr_in6 addr;
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	struct sockaddr_in addr;
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	socklen_t addrlen;
	int debug_level;
	int errors;
	};


	struct ctrl_iface_priv {
	struct wpa_supplicant *wpa_s;
	int sock;
	struct wpa_ctrl_dst *ctrl_dst;
	u8 cookie[COOKIE_LEN];
	};


	static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
	int level, const char *buf,
	size_t len);


	static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	struct sockaddr_in6 *from,
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	struct sockaddr_in *from,
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	socklen_t fromlen)
	{
	struct wpa_ctrl_dst *dst;
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	char addr[INET6_ADDRSTRLEN];
	#endif /* CONFIG_UDP_IPV6 */

	dst = os_zalloc(sizeof(*dst));
	if (dst == NULL)
	return -1;
	os_memcpy(&dst->addr, from, sizeof(*from));
	dst->addrlen = fromlen;
	dst->debug_level = MSG_INFO;
	dst->next = priv->ctrl_dst;
	priv->ctrl_dst = dst;
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
	inet_ntop(AF_INET6, &from->sin6_addr, addr, sizeof(*from)),
	ntohs(from->sin6_port));
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
	inet_ntoa(from->sin_addr), ntohs(from->sin_port));
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	return 0;
	}


	static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	struct sockaddr_in6 *from,
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	struct sockaddr_in *from,
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	socklen_t fromlen)
	{
	struct wpa_ctrl_dst dst, prev = NULL;
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	char addr[INET6_ADDRSTRLEN];
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */

	dst = priv->ctrl_dst;
	while (dst) {
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	if (from->sin6_port == dst->addr.sin6_port &&
	!os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
	sizeof(from->sin6_addr))) {
	wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached %s:%d",
	inet_ntop(AF_INET6, &from->sin6_addr, addr,
	sizeof(*from)),
	ntohs(from->sin6_port));
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
	from->sin_port == dst->addr.sin_port) {
	wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached "
	"%s:%d", inet_ntoa(from->sin_addr),
	ntohs(from->sin_port));
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	if (prev == NULL)
	priv->ctrl_dst = dst->next;
	else
	prev->next = dst->next;
	os_free(dst);
	return 0;
	}
	prev = dst;
	dst = dst->next;
	}
	return -1;
	}


	static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	struct sockaddr_in6 *from,
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	struct sockaddr_in *from,
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	socklen_t fromlen,
	char *level)
	{
	struct wpa_ctrl_dst *dst;
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	char addr[INET6_ADDRSTRLEN];
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */

	wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);

	dst = priv->ctrl_dst;
	while (dst) {
	#if CONFIG_CTRL_IFACE_UDP_IPV6
	if (from->sin6_port == dst->addr.sin6_port &&
	!os_memcmp(&from->sin6_addr, &dst->addr.sin6_addr,
	sizeof(from->sin6_addr))) {
	wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor level %s:%d",
	inet_ntop(AF_INET6, &from->sin6_addr, addr,
	sizeof(*from)),
	ntohs(from->sin6_port));
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
	from->sin_port == dst->addr.sin_port) {
	wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor "
	"level %s:%d", inet_ntoa(from->sin_addr),
	ntohs(from->sin_port));
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	dst->debug_level = atoi(level);
	return 0;
	}
	dst = dst->next;
	}

	return -1;
	}


	static char *
	wpa_supplicant_ctrl_iface_get_cookie(struct ctrl_iface_priv *priv,
	size_t *reply_len)
	{
	char *reply;
	reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
	if (reply == NULL) {
	*reply_len = 1;
	return NULL;
	}

	os_memcpy(reply, "COOKIE=", 7);
	wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
	priv->cookie, COOKIE_LEN);

	reply_len = 7 + 2 COOKIE_LEN;
	return reply;
	}


	static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
	void *sock_ctx)
	{
	struct wpa_supplicant *wpa_s = eloop_ctx;
	struct ctrl_iface_priv *priv = sock_ctx;
	char buf[256], *pos;
	int res;
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	struct sockaddr_in6 from;
	#ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
	char addr[INET6_ADDRSTRLEN];
	#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	struct sockaddr_in from;
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	socklen_t fromlen = sizeof(from);
	char *reply = NULL;
	size_t reply_len = 0;
	int new_attached = 0;
	u8 cookie[COOKIE_LEN];

	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
	(struct sockaddr *) &from, &fromlen);
	if (res < 0) {
	wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
	strerror(errno));
	return;
	}

	#ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	inet_ntop(AF_INET6, &from.sin6_addr, addr, sizeof(from));
	if (os_strcmp(addr, "::1")) {
	wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected source %s",
	addr);
	}
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	if (from.sin_addr.s_addr != htonl((127 << 24) \| 1)) {
	/*
	* The OS networking stack is expected to drop this kind of
	* frames since the socket is bound to only localhost address.
	* Just in case, drop the frame if it is coming from any other
	* address.
	*/
	wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
	"source %s", inet_ntoa(from.sin_addr));
	return;
	}
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */

	buf[res] = '\0';

	if (os_strcmp(buf, "GET_COOKIE") == 0) {
	reply = wpa_supplicant_ctrl_iface_get_cookie(priv, &reply_len);
	goto done;
	}

	/*
	* Require that the client includes a prefix with the 'cookie' value
	* fetched with GET_COOKIE command. This is used to verify that the
	* client has access to a bidirectional link over UDP in order to
	* avoid attacks using forged localhost IP address even if the OS does
	* not block such frames from remote destinations.
	*/
	if (os_strncmp(buf, "COOKIE=", 7) != 0) {
	wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
	"drop request");
	return;
	}

	if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
	wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
	"request - drop request");
	return;
	}

	if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
	wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
	"drop request");
	return;
	}

	pos = buf + 7 + 2 * COOKIE_LEN;
	while (*pos == ' ')
	pos++;

	if (os_strcmp(pos, "ATTACH") == 0) {
	if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
	reply_len = 1;
	else {
	new_attached = 1;
	reply_len = 2;
	}
	} else if (os_strcmp(pos, "DETACH") == 0) {
	if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
	reply_len = 1;
	else
	reply_len = 2;
	} else if (os_strncmp(pos, "LEVEL ", 6) == 0) {
	if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
	pos + 6))
	reply_len = 1;
	else
	reply_len = 2;
	} else {
	reply = wpa_supplicant_ctrl_iface_process(wpa_s, pos,
	&reply_len);
	}

	done:
	if (reply) {
	sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
	fromlen);
	os_free(reply);
	} else if (reply_len == 1) {
	sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
	fromlen);
	} else if (reply_len == 2) {
	sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
	fromlen);
	}

	if (new_attached)
	eapol_sm_notify_ctrl_attached(wpa_s->eapol);
	}


	static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
	enum wpa_msg_type type,
	const char *txt, size_t len)
	{
	struct wpa_supplicant *wpa_s = ctx;
	if (wpa_s == NULL \|\| wpa_s->ctrl_iface == NULL)
	return;
	wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
	}


	struct ctrl_iface_priv *
	wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
	{
	struct ctrl_iface_priv *priv;
	int port = WPA_CTRL_IFACE_PORT;
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	struct sockaddr_in6 addr;
	int domain = PF_INET6;
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	struct sockaddr_in addr;
	int domain = PF_INET;
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */

	priv = os_zalloc(sizeof(*priv));
	if (priv == NULL)
	return NULL;
	priv->wpa_s = wpa_s;
	priv->sock = -1;
	os_get_random(priv->cookie, COOKIE_LEN);

	if (wpa_s->conf->ctrl_interface == NULL)
	return priv;

	priv->sock = socket(domain, SOCK_DGRAM, 0);
	if (priv->sock < 0) {
	wpa_printf(MSG_ERROR, "socket(PF_INET): %s", strerror(errno));
	goto fail;
	}

	os_memset(&addr, 0, sizeof(addr));
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	addr.sin6_family = AF_INET6;
	#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
	addr.sin6_addr = in6addr_any;
	#else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
	inet_pton(AF_INET6, "::1", &addr.sin6_addr);
	#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	addr.sin_family = AF_INET;
	#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
	addr.sin_addr.s_addr = INADDR_ANY;
	#else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
	addr.sin_addr.s_addr = htonl((127 << 24) \| 1);
	#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	try_again:
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	addr.sin6_port = htons(port);
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	addr.sin_port = htons(port);
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
	port--;
	if ((WPA_CTRL_IFACE_PORT - port) < WPA_CTRL_IFACE_PORT_LIMIT)
	goto try_again;
	wpa_printf(MSG_ERROR, "bind(AF_INET): %s", strerror(errno));
	goto fail;
	}

	#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
	wpa_msg(wpa_s, MSG_DEBUG, "ctrl_iface_init UDP port: %d", port);
	#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */

	eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
	wpa_s, priv);
	wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);

	return priv;

	fail:
	if (priv->sock >= 0)
	close(priv->sock);
	os_free(priv);
	return NULL;
	}


	void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
	{
	struct wpa_ctrl_dst dst, prev;

	if (priv->sock > -1) {
	eloop_unregister_read_sock(priv->sock);
	if (priv->ctrl_dst) {
	/*
	* Wait before closing the control socket if
	* there are any attached monitors in order to allow
	* them to receive any pending messages.
	*/
	wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
	"monitors to receive messages");
	os_sleep(0, 100000);
	}
	close(priv->sock);
	priv->sock = -1;
	}

	dst = priv->ctrl_dst;
	while (dst) {
	prev = dst;
	dst = dst->next;
	os_free(prev);
	}
	os_free(priv);
	}


	static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
	int level, const char *buf,
	size_t len)
	{
	struct wpa_ctrl_dst dst, next;
	char levelstr[10];
	int idx;
	char *sbuf;
	int llen;
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	char addr[INET6_ADDRSTRLEN];
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */

	dst = priv->ctrl_dst;
	if (priv->sock < 0 \|\| dst == NULL)
	return;

	os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);

	llen = os_strlen(levelstr);
	sbuf = os_malloc(llen + len);
	if (sbuf == NULL)
	return;

	os_memcpy(sbuf, levelstr, llen);
	os_memcpy(sbuf + llen, buf, len);

	idx = 0;
	while (dst) {
	next = dst->next;
	if (level >= dst->debug_level) {
	#ifdef CONFIG_CTRL_IFACE_UDP_IPV6
	wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
	inet_ntop(AF_INET6, &dst->addr.sin6_addr,
	addr, sizeof(dst->addr)),
	ntohs(dst->addr.sin6_port));
	#else /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
	inet_ntoa(dst->addr.sin_addr),
	ntohs(dst->addr.sin_port));
	#endif /* CONFIG_CTRL_IFACE_UDP_IPV6 */
	if (sendto(priv->sock, sbuf, llen + len, 0,
	(struct sockaddr *) &dst->addr,
	sizeof(dst->addr)) < 0) {
	wpa_printf(MSG_ERROR,
	"sendto(CTRL_IFACE monitor): %s",
	strerror(errno));
	dst->errors++;
	if (dst->errors > 10) {
	wpa_supplicant_ctrl_iface_detach(
	priv, &dst->addr,
	dst->addrlen);
	}
	} else
	dst->errors = 0;
	}
	idx++;
	dst = next;
	}
	os_free(sbuf);
	}


	void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
	{
	wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor",
	priv->wpa_s->ifname);
	eloop_wait_for_read_sock(priv->sock);
	}


	/* Global ctrl_iface */

	struct ctrl_iface_global_priv {
	int sock;
	u8 cookie[COOKIE_LEN];
	};


	static char *
	wpa_supplicant_global_get_cookie(struct ctrl_iface_global_priv *priv,
	size_t *reply_len)
	{
	char *reply;
	reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
	if (reply == NULL) {
	*reply_len = 1;
	return NULL;
	}

	os_memcpy(reply, "COOKIE=", 7);
	wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
	priv->cookie, COOKIE_LEN);

	reply_len = 7 + 2 COOKIE_LEN;
	return reply;
	}


	static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
	void *sock_ctx)
	{
	struct wpa_global *global = eloop_ctx;
	struct ctrl_iface_global_priv *priv = sock_ctx;
	char buf[256], *pos;
	int res;
	struct sockaddr_in from;
	socklen_t fromlen = sizeof(from);
	char *reply;
	size_t reply_len;
	u8 cookie[COOKIE_LEN];

	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
	(struct sockaddr *) &from, &fromlen);
	if (res < 0) {
	wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
	strerror(errno));
	return;
	}

	#ifndef CONFIG_CTRL_IFACE_UDP_REMOTE
	if (from.sin_addr.s_addr != htonl((127 << 24) \| 1)) {
	/*
	* The OS networking stack is expected to drop this kind of
	* frames since the socket is bound to only localhost address.
	* Just in case, drop the frame if it is coming from any other
	* address.
	*/
	wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
	"source %s", inet_ntoa(from.sin_addr));
	return;
	}
	#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */

	buf[res] = '\0';

	if (os_strcmp(buf, "GET_COOKIE") == 0) {
	reply = wpa_supplicant_global_get_cookie(priv, &reply_len);
	goto done;
	}

	if (os_strncmp(buf, "COOKIE=", 7) != 0) {
	wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
	"drop request");
	return;
	}

	if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
	wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
	"request - drop request");
	return;
	}

	if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
	wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
	"drop request");
	return;
	}

	pos = buf + 7 + 2 * COOKIE_LEN;
	while (*pos == ' ')
	pos++;

	reply = wpa_supplicant_global_ctrl_iface_process(global, pos,
	&reply_len);

	done:
	if (reply) {
	sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
	fromlen);
	os_free(reply);
	} else if (reply_len) {
	sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
	fromlen);
	}
	}


	struct ctrl_iface_global_priv *
	wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
	{
	struct ctrl_iface_global_priv *priv;
	struct sockaddr_in addr;
	int port = WPA_GLOBAL_CTRL_IFACE_PORT;

	priv = os_zalloc(sizeof(*priv));
	if (priv == NULL)
	return NULL;
	priv->sock = -1;
	os_get_random(priv->cookie, COOKIE_LEN);

	if (global->params.ctrl_interface == NULL)
	return priv;

	wpa_printf(MSG_DEBUG, "Global control interface '%s'",
	global->params.ctrl_interface);

	priv->sock = socket(PF_INET, SOCK_DGRAM, 0);
	if (priv->sock < 0) {
	wpa_printf(MSG_ERROR, "socket(PF_INET): %s", strerror(errno));
	goto fail;
	}

	os_memset(&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
	addr.sin_addr.s_addr = INADDR_ANY;
	#else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
	addr.sin_addr.s_addr = htonl((127 << 24) \| 1);
	#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
	try_again:
	addr.sin_port = htons(port);
	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
	port++;
	if ((port - WPA_GLOBAL_CTRL_IFACE_PORT) <
	WPA_GLOBAL_CTRL_IFACE_PORT_LIMIT)
	goto try_again;
	wpa_printf(MSG_ERROR, "bind(AF_INET): %s", strerror(errno));
	goto fail;
	}

	#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
	wpa_printf(MSG_DEBUG, "global_ctrl_iface_init UDP port: %d", port);
	#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */

	eloop_register_read_sock(priv->sock,
	wpa_supplicant_global_ctrl_iface_receive,
	global, priv);

	return priv;

	fail:
	if (priv->sock >= 0)
	close(priv->sock);
	os_free(priv);
	return NULL;
	}


	void
	wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
	{
	if (priv->sock >= 0) {
	eloop_unregister_read_sock(priv->sock);
	close(priv->sock);
	}
	os_free(priv);
	}