diff options
Diffstat (limited to 'Source/charon/encoding/payloads/eap_payload.c')
| -rw-r--r-- | Source/charon/encoding/payloads/eap_payload.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/Source/charon/encoding/payloads/eap_payload.c b/Source/charon/encoding/payloads/eap_payload.c new file mode 100644 index 000000000..f6f8426e0 --- /dev/null +++ b/Source/charon/encoding/payloads/eap_payload.c @@ -0,0 +1,232 @@ +/** + * @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 <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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 <utils/allocator.h> + + +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) +{ + if (this->critical) + { + /* critical bit is set! */ + return FAILED; + } + 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)); +} |