text: /*
   * hostapd / EAP-Identity
   * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * Alternatively, this software may be distributed under the terms of BSD
   * license.
   *
   * See README and COPYING for more details.
   */
  
  #include "includes.h"
  
  #include "common.h"
  #include "eap_i.h"
  
  
  struct eap_identity_data {
  	enum { CONTINUE, SUCCESS, FAILURE } state;
  	int pick_up;
  };
  
  
  static void * eap_identity_init(struct eap_sm *sm)
  {
  	struct eap_identity_data *data;
  
  	data = os_zalloc(sizeof(*data));
  	if (data == NULL)
  		return NULL;
  	data->state = CONTINUE;
  
  	return data;
  }
  
  
  static void * eap_identity_initPickUp(struct eap_sm *sm)
  {
  	struct eap_identity_data *data;
  	data = eap_identity_init(sm);
  	if (data) {
  		data->pick_up = 1;
  	}
  	return data;
  }
  
  
  static void eap_identity_reset(struct eap_sm *sm, void *priv)
  {
  	struct eap_identity_data *data = priv;
  	os_free(data);
  }
  
  
  static struct wpabuf * eap_identity_buildReq(struct eap_sm *sm, void *priv,
  					     u8 id)
  {
  	struct eap_identity_data *data = priv;
  	struct wpabuf *req;
  	const char *req_data;
  	size_t req_data_len;
  
  	if (sm->eapol_cb->get_eap_req_id_text) {
  		req_data = sm->eapol_cb->get_eap_req_id_text(sm->eapol_ctx,
  							     &req_data_len);
  	} else {
  		req_data = NULL;
  		req_data_len = 0;
  	}
  	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, req_data_len,
  			    EAP_CODE_REQUEST, id);
  	if (req == NULL) {
  		wpa_printf(MSG_ERROR, "EAP-Identity: Failed to allocate "
  			   "memory for request");
  		data->state = FAILURE;
  		return NULL;
  	}
  
  	wpabuf_put_data(req, req_data, req_data_len);
  
  	return req;
  }
  
  
  static Boolean eap_identity_check(struct eap_sm *sm, void *priv,
  				  struct wpabuf *respData)
  {
  	const u8 *pos;
  	size_t len;
  
  	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
  			       respData, &len);
  	if (pos == NULL) {
  		wpa_printf(MSG_INFO, "EAP-Identity: Invalid frame");
  		return TRUE;
  	}
  
  	return FALSE;
  }
  
  
  static void eap_identity_process(struct eap_sm *sm, void *priv,
  				 struct wpabuf *respData)
  {
  	struct eap_identity_data *data = priv;
  	const u8 *pos;
  	size_t len;
  
  	if (data->pick_up) {
  		if (eap_identity_check(sm, data, respData)) {
  			wpa_printf(MSG_DEBUG, "EAP-Identity: failed to pick "
  				   "up already started negotiation");
  			data->state = FAILURE;
  			return;
  		}
  		data->pick_up = 0;
  	}
  
  	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
  			       respData, &len);
  	if (pos == NULL)
  		return; /* Should not happen - frame already validated */
  
  	wpa_hexdump_ascii(MSG_DEBUG, "EAP-Identity: Peer identity", pos, len);
  	if (sm->identity)
  		sm->update_user = TRUE;
  	os_free(sm->identity);
  	sm->identity = os_malloc(len ? len : 1);
  	if (sm->identity == NULL) {
  		data->state = FAILURE;
  	} else {
  		os_memcpy(sm->identity, pos, len);
  		sm->identity_len = len;
  		data->state = SUCCESS;
  	}
  }
  
  
  static Boolean eap_identity_isDone(struct eap_sm *sm, void *priv)
  {
  	struct eap_identity_data *data = priv;
  	return data->state != CONTINUE;
  }
  
  
  static Boolean eap_identity_isSuccess(struct eap_sm *sm, void *priv)
  {
  	struct eap_identity_data *data = priv;
  	return data->state == SUCCESS;
  }
  
  
  int eap_server_identity_register(void)
  {
  	struct eap_method *eap;
  	int ret;
  
  	eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
  				      EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
  				      "Identity");
  	if (eap == NULL)
  		return -1;
  
  	eap->init = eap_identity_init;
  	eap->initPickUp = eap_identity_initPickUp;
  	eap->reset = eap_identity_reset;
  	eap->buildReq = eap_identity_buildReq;
  	eap->check = eap_identity_check;
  	eap->process = eap_identity_process;
  	eap->isDone = eap_identity_isDone;
  	eap->isSuccess = eap_identity_isSuccess;
  
  	ret = eap_server_method_register(eap);
  	if (ret)
  		eap_server_method_free(eap);
  	return ret;
  }
  