hostap/src/eap_server/eap_server_wsc.c - nest-learning-thermostat/5.2/hostap - Git at Google

 /*
  * EAP-WSC server for Wi-Fi Protected Setup
  * Copyright (c) 2007-2008, 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 "eap_i.h"
 #include "eap_common/eap_wsc_common.h"
 #include "p2p/p2p.h"
 #include "wps/wps.h"


 struct eap_wsc_data {
 	enum { START, MESG, FRAG_ACK, WAIT_FRAG_ACK, DONE, FAIL } state;
 	int registrar;
 	struct wpabuf *in_buf;
 	struct wpabuf *out_buf;
 	enum wsc_op_code in_op_code, out_op_code;
 	size_t out_used;
 	size_t fragment_size;
 	struct wps_data *wps;
 	int ext_reg_timeout;
 };


 #ifndef CONFIG_NO_STDOUT_DEBUG
 static const char * eap_wsc_state_txt(int state)
 {
 	switch (state) {
 	case START:
 		return "START";
 	case MESG:
 		return "MESG";
 	case FRAG_ACK:
 		return "FRAG_ACK";
 	case WAIT_FRAG_ACK:
 		return "WAIT_FRAG_ACK";
 	case DONE:
 		return "DONE";
 	case FAIL:
 		return "FAIL";
 	default:
 		return "?";
 	}
 }
 #endif /* CONFIG_NO_STDOUT_DEBUG */


 static void eap_wsc_state(struct eap_wsc_data *data, int state)
 {
 	wpa_printf(MSG_DEBUG, "EAP-WSC: %s -> %s",
 		   eap_wsc_state_txt(data->state),
 		   eap_wsc_state_txt(state));
 	data->state = state;
 }


 static void eap_wsc_ext_reg_timeout(void *eloop_ctx, void *timeout_ctx)
 {
 	struct eap_sm *sm = eloop_ctx;
 	struct eap_wsc_data *data = timeout_ctx;

 	if (sm->method_pending != METHOD_PENDING_WAIT)
 		return;

 	wpa_printf(MSG_DEBUG, "EAP-WSC: Timeout while waiting for an External "
 		   "Registrar");
 	data->ext_reg_timeout = 1;
 	eap_sm_pending_cb(sm);
 }


 static void * eap_wsc_init(struct eap_sm *sm)
 {
 	struct eap_wsc_data *data;
 	int registrar;
 	struct wps_config cfg;

 	if (sm->identity && sm->identity_len == WSC_ID_REGISTRAR_LEN &&
 	    os_memcmp(sm->identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) ==
 	    0)
 		registrar = 0; /* Supplicant is Registrar */
 	else if (sm->identity && sm->identity_len == WSC_ID_ENROLLEE_LEN &&
 		 os_memcmp(sm->identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN)
 		 == 0)
 		registrar = 1; /* Supplicant is Enrollee */
 	else {
 		wpa_hexdump_ascii(MSG_INFO, "EAP-WSC: Unexpected identity",
 				  sm->identity, sm->identity_len);
 		return NULL;
 	}

 	data = os_zalloc(sizeof(*data));
 	if (data == NULL)
 		return NULL;
 	data->state = registrar ? START : MESG;
 	data->registrar = registrar;

 	os_memset(&cfg, 0, sizeof(cfg));
 	cfg.wps = sm->wps;
 	cfg.registrar = registrar;
 	if (registrar) {
 		if (sm->wps == NULL || sm->wps->registrar == NULL) {
 			wpa_printf(MSG_INFO, "EAP-WSC: WPS Registrar not "
 				   "initialized");
 			os_free(data);
 			return NULL;
 		}
 	} else {
 		if (sm->user == NULL || sm->user->password == NULL) {
 			/*
 			 * In theory, this should not really be needed, but
 			 * Windows 7 uses Registrar mode to probe AP's WPS
 			 * capabilities before trying to use Enrollee and fails
 			 * if the AP does not allow that probing to happen..
 			 */
 			wpa_printf(MSG_DEBUG, "EAP-WSC: No AP PIN (password) "
 				   "configured for Enrollee functionality - "
 				   "allow for probing capabilities (M1)");
 		} else {
 			cfg.pin = sm->user->password;
 			cfg.pin_len = sm->user->password_len;
 		}
 	}
 	cfg.assoc_wps_ie = sm->assoc_wps_ie;
 	cfg.peer_addr = sm->peer_addr;
 #ifdef CONFIG_P2P
 	if (sm->assoc_p2p_ie) {
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Prefer PSK format for P2P "
 			   "client");
 		cfg.use_psk_key = 1;
 		cfg.p2p_dev_addr = p2p_get_go_dev_addr(sm->assoc_p2p_ie);
 	}
 #endif /* CONFIG_P2P */
 	cfg.pbc_in_m1 = sm->pbc_in_m1;
 	data->wps = wps_init(&cfg);
 	if (data->wps == NULL) {
 		os_free(data);
 		return NULL;
 	}
 	data->fragment_size = sm->fragment_size > 0 ? sm->fragment_size :
 		WSC_FRAGMENT_SIZE;

 	return data;
 }


 static void eap_wsc_reset(struct eap_sm *sm, void *priv)
 {
 	struct eap_wsc_data *data = priv;
 	eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
 	wpabuf_free(data->in_buf);
 	wpabuf_free(data->out_buf);
 	wps_deinit(data->wps);
 	os_free(data);
 }


 static struct wpabuf * eap_wsc_build_start(struct eap_sm *sm,
 					   struct eap_wsc_data *data, u8 id)
 {
 	struct wpabuf *req;

 	req = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, 2,
 			    EAP_CODE_REQUEST, id);
 	if (req == NULL) {
 		wpa_printf(MSG_ERROR, "EAP-WSC: Failed to allocate memory for "
 			   "request");
 		return NULL;
 	}

 	wpa_printf(MSG_DEBUG, "EAP-WSC: Send WSC/Start");
 	wpabuf_put_u8(req, WSC_Start); /* Op-Code */
 	wpabuf_put_u8(req, 0); /* Flags */

 	return req;
 }


 static struct wpabuf * eap_wsc_build_msg(struct eap_wsc_data *data, u8 id)
 {
 	struct wpabuf *req;
 	u8 flags;
 	size_t send_len, plen;

 	flags = 0;
 	send_len = wpabuf_len(data->out_buf) - data->out_used;
 	if (2 + send_len > data->fragment_size) {
 		send_len = data->fragment_size - 2;
 		flags |= WSC_FLAGS_MF;
 		if (data->out_used == 0) {
 			flags |= WSC_FLAGS_LF;
 			send_len -= 2;
 		}
 	}
 	plen = 2 + send_len;
 	if (flags & WSC_FLAGS_LF)
 		plen += 2;
 	req = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, plen,
 			    EAP_CODE_REQUEST, id);
 	if (req == NULL) {
 		wpa_printf(MSG_ERROR, "EAP-WSC: Failed to allocate memory for "
 			   "request");
 		return NULL;
 	}

 	wpabuf_put_u8(req, data->out_op_code); /* Op-Code */
 	wpabuf_put_u8(req, flags); /* Flags */
 	if (flags & WSC_FLAGS_LF)
 		wpabuf_put_be16(req, wpabuf_len(data->out_buf));

 	wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
 			send_len);
 	data->out_used += send_len;

 	if (data->out_used == wpabuf_len(data->out_buf)) {
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
 			   "(message sent completely)",
 			   (unsigned long) send_len);
 		wpabuf_free(data->out_buf);
 		data->out_buf = NULL;
 		data->out_used = 0;
 		eap_wsc_state(data, MESG);
 	} else {
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
 			   "(%lu more to send)", (unsigned long) send_len,
 			   (unsigned long) wpabuf_len(data->out_buf) -
 			   data->out_used);
 		eap_wsc_state(data, WAIT_FRAG_ACK);
 	}

 	return req;
 }


 static struct wpabuf * eap_wsc_buildReq(struct eap_sm *sm, void *priv, u8 id)
 {
 	struct eap_wsc_data *data = priv;

 	switch (data->state) {
 	case START:
 		return eap_wsc_build_start(sm, data, id);
 	case MESG:
 		if (data->out_buf == NULL) {
 			data->out_buf = wps_get_msg(data->wps,
 						    &data->out_op_code);
 			if (data->out_buf == NULL) {
 				wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to "
 					   "receive message from WPS");
 				return NULL;
 			}
 			data->out_used = 0;
 		}
 		/* pass through */
 	case WAIT_FRAG_ACK:
 		return eap_wsc_build_msg(data, id);
 	case FRAG_ACK:
 		return eap_wsc_build_frag_ack(id, EAP_CODE_REQUEST);
 	default:
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected state %d in "
 			   "buildReq", data->state);
 		return NULL;
 	}
 }


 static Boolean eap_wsc_check(struct eap_sm *sm, void *priv,
 			     struct wpabuf *respData)
 {
 	const u8 *pos;
 	size_t len;

 	pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
 			       respData, &len);
 	if (pos == NULL || len < 2) {
 		wpa_printf(MSG_INFO, "EAP-WSC: Invalid frame");
 		return TRUE;
 	}

 	return FALSE;
 }


 static int eap_wsc_process_cont(struct eap_wsc_data *data,
 				const u8 *buf, size_t len, u8 op_code)
 {
 	/* Process continuation of a pending message */
 	if (op_code != data->in_op_code) {
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d in "
 			   "fragment (expected %d)",
 			   op_code, data->in_op_code);
 		eap_wsc_state(data, FAIL);
 		return -1;
 	}

 	if (len > wpabuf_tailroom(data->in_buf)) {
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment overflow");
 		eap_wsc_state(data, FAIL);
 		return -1;
 	}

 	wpabuf_put_data(data->in_buf, buf, len);
 	wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes, waiting for %lu "
 		   "bytes more", (unsigned long) len,
 		   (unsigned long) wpabuf_tailroom(data->in_buf));

 	return 0;
 }


 static int eap_wsc_process_fragment(struct eap_wsc_data *data,
 				    u8 flags, u8 op_code, u16 message_length,
 				    const u8 *buf, size_t len)
 {
 	/* Process a fragment that is not the last one of the message */
 	if (data->in_buf == NULL && !(flags & WSC_FLAGS_LF)) {
 		wpa_printf(MSG_DEBUG, "EAP-WSC: No Message Length "
 			   "field in a fragmented packet");
 		return -1;
 	}

 	if (data->in_buf == NULL) {
 		/* First fragment of the message */
 		data->in_buf = wpabuf_alloc(message_length);
 		if (data->in_buf == NULL) {
 			wpa_printf(MSG_DEBUG, "EAP-WSC: No memory for "
 				   "message");
 			return -1;
 		}
 		data->in_op_code = op_code;
 		wpabuf_put_data(data->in_buf, buf, len);
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes in "
 			   "first fragment, waiting for %lu bytes more",
 			   (unsigned long) len,
 			   (unsigned long) wpabuf_tailroom(data->in_buf));
 	}

 	return 0;
 }


 static void eap_wsc_process(struct eap_sm *sm, void *priv,
 			    struct wpabuf *respData)
 {
 	struct eap_wsc_data *data = priv;
 	const u8 *start, *pos, *end;
 	size_t len;
 	u8 op_code, flags;
 	u16 message_length = 0;
 	enum wps_process_res res;
 	struct wpabuf tmpbuf;

 	eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
 	if (data->ext_reg_timeout) {
 		eap_wsc_state(data, FAIL);
 		return;
 	}

 	pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
 			       respData, &len);
 	if (pos == NULL || len < 2)
 		return; /* Should not happen; message already verified */

 	start = pos;
 	end = start + len;

 	op_code = *pos++;
 	flags = *pos++;
 	if (flags & WSC_FLAGS_LF) {
 		if (end - pos < 2) {
 			wpa_printf(MSG_DEBUG, "EAP-WSC: Message underflow");
 			return;
 		}
 		message_length = WPA_GET_BE16(pos);
 		pos += 2;

 		if (message_length < end - pos) {
 			wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid Message "
 				   "Length");
 			return;
 		}
 	}

 	wpa_printf(MSG_DEBUG, "EAP-WSC: Received packet: Op-Code %d "
 		   "Flags 0x%x Message Length %d",
 		   op_code, flags, message_length);

 	if (data->state == WAIT_FRAG_ACK) {
 		if (op_code != WSC_FRAG_ACK) {
 			wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
 				   "in WAIT_FRAG_ACK state", op_code);
 			eap_wsc_state(data, FAIL);
 			return;
 		}
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment acknowledged");
 		eap_wsc_state(data, MESG);
 		return;
 	}

 	if (op_code != WSC_ACK && op_code != WSC_NACK && op_code != WSC_MSG &&
 	    op_code != WSC_Done) {
 		wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
 			   op_code);
 		eap_wsc_state(data, FAIL);
 		return;
 	}

 	if (data->in_buf &&
 	    eap_wsc_process_cont(data, pos, end - pos, op_code) < 0) {
 		eap_wsc_state(data, FAIL);
 		return;
 	}

 	if (flags & WSC_FLAGS_MF) {
 		if (eap_wsc_process_fragment(data, flags, op_code,
 					     message_length, pos, end - pos) <
 		    0)
 			eap_wsc_state(data, FAIL);
 		else
 			eap_wsc_state(data, FRAG_ACK);
 		return;
 	}

 	if (data->in_buf == NULL) {
 		/* Wrap unfragmented messages as wpabuf without extra copy */
 		wpabuf_set(&tmpbuf, pos, end - pos);
 		data->in_buf = &tmpbuf;
 	}

 	res = wps_process_msg(data->wps, op_code, data->in_buf);
 	switch (res) {
 	case WPS_DONE:
 		wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing completed "
 			   "successfully - report EAP failure");
 		eap_wsc_state(data, FAIL);
 		break;
 	case WPS_CONTINUE:
 		eap_wsc_state(data, MESG);
 		break;
 	case WPS_FAILURE:
 		wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing failed");
 		eap_wsc_state(data, FAIL);
 		break;
 	case WPS_PENDING:
 		eap_wsc_state(data, MESG);
 		sm->method_pending = METHOD_PENDING_WAIT;
 		eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
 		eloop_register_timeout(5, 0, eap_wsc_ext_reg_timeout,
 				       sm, data);
 		break;
 	}

 	if (data->in_buf != &tmpbuf)
 		wpabuf_free(data->in_buf);
 	data->in_buf = NULL;
 }


 static Boolean eap_wsc_isDone(struct eap_sm *sm, void *priv)
 {
 	struct eap_wsc_data *data = priv;
 	return data->state == FAIL;
 }


 static Boolean eap_wsc_isSuccess(struct eap_sm *sm, void *priv)
 {
 	/* EAP-WSC will always result in EAP-Failure */
 	return FALSE;
 }


 static int eap_wsc_getTimeout(struct eap_sm *sm, void *priv)
 {
 	/* Recommended retransmit times: retransmit timeout 5 seconds,
 	 * per-message timeout 15 seconds, i.e., 3 tries. */
 	sm->MaxRetrans = 2; /* total 3 attempts */
 	return 5;
 }


 int eap_server_wsc_register(void)
 {
 	struct eap_method *eap;
 	int ret;

 	eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
 				      EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
 				      "WSC");
 	if (eap == NULL)
 		return -1;

 	eap->init = eap_wsc_init;
 	eap->reset = eap_wsc_reset;
 	eap->buildReq = eap_wsc_buildReq;
 	eap->check = eap_wsc_check;
 	eap->process = eap_wsc_process;
 	eap->isDone = eap_wsc_isDone;
 	eap->isSuccess = eap_wsc_isSuccess;
 	eap->getTimeout = eap_wsc_getTimeout;

 	ret = eap_server_method_register(eap);
 	if (ret)
 		eap_server_method_free(eap);
 	return ret;
 }
	/*
	* EAP-WSC server for Wi-Fi Protected Setup
	* Copyright (c) 2007-2008, 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 "eap_i.h"
	#include "eap_common/eap_wsc_common.h"
	#include "p2p/p2p.h"
	#include "wps/wps.h"


	struct eap_wsc_data {
	enum { START, MESG, FRAG_ACK, WAIT_FRAG_ACK, DONE, FAIL } state;
	int registrar;
	struct wpabuf *in_buf;
	struct wpabuf *out_buf;
	enum wsc_op_code in_op_code, out_op_code;
	size_t out_used;
	size_t fragment_size;
	struct wps_data *wps;
	int ext_reg_timeout;
	};


	#ifndef CONFIG_NO_STDOUT_DEBUG
	static const char * eap_wsc_state_txt(int state)
	{
	switch (state) {
	case START:
	return "START";
	case MESG:
	return "MESG";
	case FRAG_ACK:
	return "FRAG_ACK";
	case WAIT_FRAG_ACK:
	return "WAIT_FRAG_ACK";
	case DONE:
	return "DONE";
	case FAIL:
	return "FAIL";
	default:
	return "?";
	}
	}
	#endif /* CONFIG_NO_STDOUT_DEBUG */


	static void eap_wsc_state(struct eap_wsc_data *data, int state)
	{
	wpa_printf(MSG_DEBUG, "EAP-WSC: %s -> %s",
	eap_wsc_state_txt(data->state),
	eap_wsc_state_txt(state));
	data->state = state;
	}


	static void eap_wsc_ext_reg_timeout(void eloop_ctx, void timeout_ctx)
	{
	struct eap_sm *sm = eloop_ctx;
	struct eap_wsc_data *data = timeout_ctx;

	if (sm->method_pending != METHOD_PENDING_WAIT)
	return;

	wpa_printf(MSG_DEBUG, "EAP-WSC: Timeout while waiting for an External "
	"Registrar");
	data->ext_reg_timeout = 1;
	eap_sm_pending_cb(sm);
	}


	static void * eap_wsc_init(struct eap_sm *sm)
	{
	struct eap_wsc_data *data;
	int registrar;
	struct wps_config cfg;

	if (sm->identity && sm->identity_len == WSC_ID_REGISTRAR_LEN &&
	os_memcmp(sm->identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) ==
	0)
	registrar = 0; /* Supplicant is Registrar */
	else if (sm->identity && sm->identity_len == WSC_ID_ENROLLEE_LEN &&
	os_memcmp(sm->identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN)
	== 0)
	registrar = 1; /* Supplicant is Enrollee */
	else {
	wpa_hexdump_ascii(MSG_INFO, "EAP-WSC: Unexpected identity",
	sm->identity, sm->identity_len);
	return NULL;
	}

	data = os_zalloc(sizeof(*data));
	if (data == NULL)
	return NULL;
	data->state = registrar ? START : MESG;
	data->registrar = registrar;

	os_memset(&cfg, 0, sizeof(cfg));
	cfg.wps = sm->wps;
	cfg.registrar = registrar;
	if (registrar) {
	if (sm->wps == NULL \|\| sm->wps->registrar == NULL) {
	wpa_printf(MSG_INFO, "EAP-WSC: WPS Registrar not "
	"initialized");
	os_free(data);
	return NULL;
	}
	} else {
	if (sm->user == NULL \|\| sm->user->password == NULL) {
	/*
	* In theory, this should not really be needed, but
	* Windows 7 uses Registrar mode to probe AP's WPS
	* capabilities before trying to use Enrollee and fails
	* if the AP does not allow that probing to happen..
	*/
	wpa_printf(MSG_DEBUG, "EAP-WSC: No AP PIN (password) "
	"configured for Enrollee functionality - "
	"allow for probing capabilities (M1)");
	} else {
	cfg.pin = sm->user->password;
	cfg.pin_len = sm->user->password_len;
	}
	}
	cfg.assoc_wps_ie = sm->assoc_wps_ie;
	cfg.peer_addr = sm->peer_addr;
	#ifdef CONFIG_P2P
	if (sm->assoc_p2p_ie) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Prefer PSK format for P2P "
	"client");
	cfg.use_psk_key = 1;
	cfg.p2p_dev_addr = p2p_get_go_dev_addr(sm->assoc_p2p_ie);
	}
	#endif /* CONFIG_P2P */
	cfg.pbc_in_m1 = sm->pbc_in_m1;
	data->wps = wps_init(&cfg);
	if (data->wps == NULL) {
	os_free(data);
	return NULL;
	}
	data->fragment_size = sm->fragment_size > 0 ? sm->fragment_size :
	WSC_FRAGMENT_SIZE;

	return data;
	}


	static void eap_wsc_reset(struct eap_sm sm, void priv)
	{
	struct eap_wsc_data *data = priv;
	eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
	wpabuf_free(data->in_buf);
	wpabuf_free(data->out_buf);
	wps_deinit(data->wps);
	os_free(data);
	}


	static struct wpabuf * eap_wsc_build_start(struct eap_sm *sm,
	struct eap_wsc_data *data, u8 id)
	{
	struct wpabuf *req;

	req = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, 2,
	EAP_CODE_REQUEST, id);
	if (req == NULL) {
	wpa_printf(MSG_ERROR, "EAP-WSC: Failed to allocate memory for "
	"request");
	return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-WSC: Send WSC/Start");
	wpabuf_put_u8(req, WSC_Start); /* Op-Code */
	wpabuf_put_u8(req, 0); /* Flags */

	return req;
	}


	static struct wpabuf * eap_wsc_build_msg(struct eap_wsc_data *data, u8 id)
	{
	struct wpabuf *req;
	u8 flags;
	size_t send_len, plen;

	flags = 0;
	send_len = wpabuf_len(data->out_buf) - data->out_used;
	if (2 + send_len > data->fragment_size) {
	send_len = data->fragment_size - 2;
	flags \|= WSC_FLAGS_MF;
	if (data->out_used == 0) {
	flags \|= WSC_FLAGS_LF;
	send_len -= 2;
	}
	}
	plen = 2 + send_len;
	if (flags & WSC_FLAGS_LF)
	plen += 2;
	req = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, plen,
	EAP_CODE_REQUEST, id);
	if (req == NULL) {
	wpa_printf(MSG_ERROR, "EAP-WSC: Failed to allocate memory for "
	"request");
	return NULL;
	}

	wpabuf_put_u8(req, data->out_op_code); /* Op-Code */
	wpabuf_put_u8(req, flags); /* Flags */
	if (flags & WSC_FLAGS_LF)
	wpabuf_put_be16(req, wpabuf_len(data->out_buf));

	wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
	send_len);
	data->out_used += send_len;

	if (data->out_used == wpabuf_len(data->out_buf)) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
	"(message sent completely)",
	(unsigned long) send_len);
	wpabuf_free(data->out_buf);
	data->out_buf = NULL;
	data->out_used = 0;
	eap_wsc_state(data, MESG);
	} else {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
	"(%lu more to send)", (unsigned long) send_len,
	(unsigned long) wpabuf_len(data->out_buf) -
	data->out_used);
	eap_wsc_state(data, WAIT_FRAG_ACK);
	}

	return req;
	}


	static struct wpabuf * eap_wsc_buildReq(struct eap_sm sm, void priv, u8 id)
	{
	struct eap_wsc_data *data = priv;

	switch (data->state) {
	case START:
	return eap_wsc_build_start(sm, data, id);
	case MESG:
	if (data->out_buf == NULL) {
	data->out_buf = wps_get_msg(data->wps,
	&data->out_op_code);
	if (data->out_buf == NULL) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to "
	"receive message from WPS");
	return NULL;
	}
	data->out_used = 0;
	}
	/* pass through */
	case WAIT_FRAG_ACK:
	return eap_wsc_build_msg(data, id);
	case FRAG_ACK:
	return eap_wsc_build_frag_ack(id, EAP_CODE_REQUEST);
	default:
	wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected state %d in "
	"buildReq", data->state);
	return NULL;
	}
	}


	static Boolean eap_wsc_check(struct eap_sm sm, void priv,
	struct wpabuf *respData)
	{
	const u8 *pos;
	size_t len;

	pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
	respData, &len);
	if (pos == NULL \|\| len < 2) {
	wpa_printf(MSG_INFO, "EAP-WSC: Invalid frame");
	return TRUE;
	}

	return FALSE;
	}


	static int eap_wsc_process_cont(struct eap_wsc_data *data,
	const u8 *buf, size_t len, u8 op_code)
	{
	/* Process continuation of a pending message */
	if (op_code != data->in_op_code) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d in "
	"fragment (expected %d)",
	op_code, data->in_op_code);
	eap_wsc_state(data, FAIL);
	return -1;
	}

	if (len > wpabuf_tailroom(data->in_buf)) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment overflow");
	eap_wsc_state(data, FAIL);
	return -1;
	}

	wpabuf_put_data(data->in_buf, buf, len);
	wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes, waiting for %lu "
	"bytes more", (unsigned long) len,
	(unsigned long) wpabuf_tailroom(data->in_buf));

	return 0;
	}


	static int eap_wsc_process_fragment(struct eap_wsc_data *data,
	u8 flags, u8 op_code, u16 message_length,
	const u8 *buf, size_t len)
	{
	/* Process a fragment that is not the last one of the message */
	if (data->in_buf == NULL && !(flags & WSC_FLAGS_LF)) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: No Message Length "
	"field in a fragmented packet");
	return -1;
	}

	if (data->in_buf == NULL) {
	/* First fragment of the message */
	data->in_buf = wpabuf_alloc(message_length);
	if (data->in_buf == NULL) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: No memory for "
	"message");
	return -1;
	}
	data->in_op_code = op_code;
	wpabuf_put_data(data->in_buf, buf, len);
	wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes in "
	"first fragment, waiting for %lu bytes more",
	(unsigned long) len,
	(unsigned long) wpabuf_tailroom(data->in_buf));
	}

	return 0;
	}


	static void eap_wsc_process(struct eap_sm sm, void priv,
	struct wpabuf *respData)
	{
	struct eap_wsc_data *data = priv;
	const u8 start, pos, *end;
	size_t len;
	u8 op_code, flags;
	u16 message_length = 0;
	enum wps_process_res res;
	struct wpabuf tmpbuf;

	eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
	if (data->ext_reg_timeout) {
	eap_wsc_state(data, FAIL);
	return;
	}

	pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
	respData, &len);
	if (pos == NULL \|\| len < 2)
	return; /* Should not happen; message already verified */

	start = pos;
	end = start + len;

	op_code = *pos++;
	flags = *pos++;
	if (flags & WSC_FLAGS_LF) {
	if (end - pos < 2) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Message underflow");
	return;
	}
	message_length = WPA_GET_BE16(pos);
	pos += 2;

	if (message_length < end - pos) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid Message "
	"Length");
	return;
	}
	}

	wpa_printf(MSG_DEBUG, "EAP-WSC: Received packet: Op-Code %d "
	"Flags 0x%x Message Length %d",
	op_code, flags, message_length);

	if (data->state == WAIT_FRAG_ACK) {
	if (op_code != WSC_FRAG_ACK) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
	"in WAIT_FRAG_ACK state", op_code);
	eap_wsc_state(data, FAIL);
	return;
	}
	wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment acknowledged");
	eap_wsc_state(data, MESG);
	return;
	}

	if (op_code != WSC_ACK && op_code != WSC_NACK && op_code != WSC_MSG &&
	op_code != WSC_Done) {
	wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
	op_code);
	eap_wsc_state(data, FAIL);
	return;
	}

	if (data->in_buf &&
	eap_wsc_process_cont(data, pos, end - pos, op_code) < 0) {
	eap_wsc_state(data, FAIL);
	return;
	}

	if (flags & WSC_FLAGS_MF) {
	if (eap_wsc_process_fragment(data, flags, op_code,
	message_length, pos, end - pos) <
	0)
	eap_wsc_state(data, FAIL);
	else
	eap_wsc_state(data, FRAG_ACK);
	return;
	}

	if (data->in_buf == NULL) {
	/* Wrap unfragmented messages as wpabuf without extra copy */
	wpabuf_set(&tmpbuf, pos, end - pos);
	data->in_buf = &tmpbuf;
	}

	res = wps_process_msg(data->wps, op_code, data->in_buf);
	switch (res) {
	case WPS_DONE:
	wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing completed "
	"successfully - report EAP failure");
	eap_wsc_state(data, FAIL);
	break;
	case WPS_CONTINUE:
	eap_wsc_state(data, MESG);
	break;
	case WPS_FAILURE:
	wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing failed");
	eap_wsc_state(data, FAIL);
	break;
	case WPS_PENDING:
	eap_wsc_state(data, MESG);
	sm->method_pending = METHOD_PENDING_WAIT;
	eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
	eloop_register_timeout(5, 0, eap_wsc_ext_reg_timeout,
	sm, data);
	break;
	}

	if (data->in_buf != &tmpbuf)
	wpabuf_free(data->in_buf);
	data->in_buf = NULL;
	}


	static Boolean eap_wsc_isDone(struct eap_sm sm, void priv)
	{
	struct eap_wsc_data *data = priv;
	return data->state == FAIL;
	}


	static Boolean eap_wsc_isSuccess(struct eap_sm sm, void priv)
	{
	/* EAP-WSC will always result in EAP-Failure */
	return FALSE;
	}


	static int eap_wsc_getTimeout(struct eap_sm sm, void priv)
	{
	/* Recommended retransmit times: retransmit timeout 5 seconds,
	* per-message timeout 15 seconds, i.e., 3 tries. */
	sm->MaxRetrans = 2; /* total 3 attempts */
	return 5;
	}


	int eap_server_wsc_register(void)
	{
	struct eap_method *eap;
	int ret;

	eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
	EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
	"WSC");
	if (eap == NULL)
	return -1;

	eap->init = eap_wsc_init;
	eap->reset = eap_wsc_reset;
	eap->buildReq = eap_wsc_buildReq;
	eap->check = eap_wsc_check;
	eap->process = eap_wsc_process;
	eap->isDone = eap_wsc_isDone;
	eap->isSuccess = eap_wsc_isSuccess;
	eap->getTimeout = eap_wsc_getTimeout;

	ret = eap_server_method_register(eap);
	if (ret)
	eap_server_method_free(eap);
	return ret;
	}