/** * @file eap_payload.c * * @brief Implementation of eap_payload_t. * */ /* * Copyright (C) 2005 Jan Hutter, Martin Willi * Hochschule fuer Technik Rapperswil * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. See . * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. */ #include "eap_payload.h" #include typedef struct private_eap_payload_t private_eap_payload_t; /** * Private data of an eap_payload_t object. * */ struct private_eap_payload_t { /** * Public eap_payload_t interface. */ eap_payload_t public; /** * Next payload type. */ u_int8_t next_payload; /** * Critical flag. */ bool critical; /** * Length of this payload. */ u_int16_t payload_length; /** * The contained message. */ chunk_t message; }; /** * Encoding rules to parse or generate a EAP payload. * * The defined offsets are the positions in a object of type * private_eap_payload_t. * */ encoding_rule_t eap_payload_encodings[] = { /* 1 Byte next payload type, stored in the field next_payload */ { U_INT_8, offsetof(private_eap_payload_t, next_payload) }, /* the critical bit */ { FLAG, offsetof(private_eap_payload_t, critical) }, /* 7 Bit reserved bits, nowhere stored */ { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, { RESERVED_BIT, 0 }, /* Length of the whole payload*/ { PAYLOAD_LENGTH, offsetof(private_eap_payload_t, payload_length)}, /* some eap data bytes, length is defined in PAYLOAD_LENGTH */ { EAP_MESSAGE, offsetof(private_eap_payload_t, message) } }; /* 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Next Payload !C! RESERVED ! Payload Length ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! ! ~ EAP Message ~ ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /** * Implementation of payload_t.verify. */ static status_t verify(private_eap_payload_t *this) { return SUCCESS; } /** * Implementation of eap_payload_t.get_encoding_rules. */ static void get_encoding_rules(private_eap_payload_t *this, encoding_rule_t **rules, size_t *rule_count) { *rules = eap_payload_encodings; *rule_count = sizeof(eap_payload_encodings) / sizeof(encoding_rule_t); } /** * Implementation of payload_t.get_type. */ static payload_type_t get_payload_type(private_eap_payload_t *this) { return EXTENSIBLE_AUTHENTICATION; } /** * Implementation of payload_t.get_next_type. */ static payload_type_t get_next_type(private_eap_payload_t *this) { return (this->next_payload); } /** * Implementation of payload_t.set_next_type. */ static void set_next_type(private_eap_payload_t *this,payload_type_t type) { this->next_payload = type; } /** * Implementation of payload_t.get_length. */ static size_t get_length(private_eap_payload_t *this) { return this->payload_length; } /** * Implementation of eap_payload_t.set_message. */ static void set_message (private_eap_payload_t *this, chunk_t message) { if (this->message.ptr != NULL) { allocator_free_chunk(&(this->message)); } this->message.ptr = allocator_clone_bytes(message.ptr,message.len); this->message.len = message.len; this->payload_length = EAP_PAYLOAD_HEADER_LENGTH + this->message.len; } /** * Implementation of eap_payload_t.get_message. */ static chunk_t get_message (private_eap_payload_t *this) { return (this->message); } /** * Implementation of eap_payload_t.get_data_clone. */ static chunk_t get_message_clone (private_eap_payload_t *this) { chunk_t cloned_message; if (this->message.ptr == NULL) { return (this->message); } cloned_message.ptr = allocator_clone_bytes(this->message.ptr,this->message.len); cloned_message.len = this->message.len; return cloned_message; } /** * Implementation of payload_t.destroy and eap_payload_t.destroy. */ static void destroy(private_eap_payload_t *this) { if (this->message.ptr != NULL) { allocator_free_chunk(&(this->message)); } allocator_free(this); } /* * Described in header */ eap_payload_t *eap_payload_create() { private_eap_payload_t *this = allocator_alloc_thing(private_eap_payload_t); /* interface functions */ this->public.payload_interface.verify = (status_t (*) (payload_t *))verify; this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules; this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length; this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type; this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type; this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_payload_type; this->public.payload_interface.destroy = (void (*) (payload_t *))destroy; /* public functions */ this->public.destroy = (void (*) (eap_payload_t *)) destroy; this->public.set_message = (void (*) (eap_payload_t *,chunk_t)) set_message; this->public.get_message_clone = (chunk_t (*) (eap_payload_t *)) get_message_clone; this->public.get_message = (chunk_t (*) (eap_payload_t *)) get_message; /* private variables */ this->critical = FALSE; this->next_payload = NO_PAYLOAD; this->payload_length = EAP_PAYLOAD_HEADER_LENGTH; this->message = CHUNK_INITIALIZER; return (&(this->public)); }