diff options
Diffstat (limited to 'src/charon/encoding/payloads/cp_payload.c')
| -rw-r--r-- | src/charon/encoding/payloads/cp_payload.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/src/charon/encoding/payloads/cp_payload.c b/src/charon/encoding/payloads/cp_payload.c new file mode 100644 index 000000000..380ed9681 --- /dev/null +++ b/src/charon/encoding/payloads/cp_payload.c @@ -0,0 +1,277 @@ +/** + * @file cp_payload.c + * + * @brief Implementation of cp_payload_t. + * + */ + +/* + * Copyright (C) 2005-2006 Martin Willi + * Copyright (C) 2005 Jan Hutter + * 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 <stddef.h> + +#include "cp_payload.h" + +#include <encoding/payloads/encodings.h> +#include <utils/linked_list.h> + +ENUM(config_type_names, CFG_REQUEST, CFG_ACK, + "CFG_REQUEST", + "CFG_REPLY", + "CFG_SET", + "CFG_ACK", +); + +typedef struct private_cp_payload_t private_cp_payload_t; + +/** + * Private data of an cp_payload_t object. + * + */ +struct private_cp_payload_t { + /** + * Public cp_payload_t interface. + */ + cp_payload_t public; + + /** + * Next payload type. + */ + u_int8_t next_payload; + + /** + * Critical flag. + */ + bool critical; + + /** + * Length of this payload. + */ + u_int16_t payload_length; + + /** + * Configuration Attributes in this payload are stored in a linked_list_t. + */ + linked_list_t * attributes; + + /** + * Config Type. + */ + u_int8_t config_type; +}; + +/** + * Encoding rules to parse or generate a IKEv2-CP Payload + * + * The defined offsets are the positions in a object of type + * private_cp_payload_t. + * + */ +encoding_rule_t cp_payload_encodings[] = { + /* 1 Byte next payload type, stored in the field next_payload */ + { U_INT_8, offsetof(private_cp_payload_t, next_payload) }, + /* the critical bit */ + { FLAG, offsetof(private_cp_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 CP payload*/ + { PAYLOAD_LENGTH, offsetof(private_cp_payload_t, payload_length) }, + /* Proposals are stored in a proposal substructure, + offset points to a linked_list_t pointer */ + { U_INT_8, offsetof(private_cp_payload_t, config_type) }, + { RESERVED_BYTE,0 }, + { RESERVED_BYTE,0 }, + { RESERVED_BYTE,0 }, + { CONFIGURATION_ATTRIBUTES, offsetof(private_cp_payload_t, attributes) } +}; + +/* + 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 ! + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + ! CFG Type ! RESERVED ! + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + ! ! + ~ Configuration Attributes ~ + ! ! + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +*/ + +/** + * Implementation of payload_t.verify. + */ +static status_t verify(private_cp_payload_t *this) +{ + status_t status = SUCCESS; + iterator_t *iterator; + configuration_attribute_t *attribute; + + iterator = this->attributes->create_iterator(this->attributes,TRUE); + while(iterator->iterate(iterator, (void**)&attribute)) + { + status = attribute->payload_interface.verify(&attribute->payload_interface); + if (status != SUCCESS) + { + break; + } + } + iterator->destroy(iterator); + return status; +} + +/** + * Implementation of payload_t.get_encoding_rules. + */ +static void get_encoding_rules(private_cp_payload_t *this, encoding_rule_t **rules, size_t *rule_count) +{ + *rules = cp_payload_encodings; + *rule_count = sizeof(cp_payload_encodings) / sizeof(encoding_rule_t); +} + +/** + * Implementation of payload_t.get_type. + */ +static payload_type_t get_type(private_cp_payload_t *this) +{ + return CONFIGURATION; +} + +/** + * Implementation of payload_t.get_next_type. + */ +static payload_type_t get_next_type(private_cp_payload_t *this) +{ + return (this->next_payload); +} + +/** + * Implementation of payload_t.set_next_type. + */ +static void set_next_type(private_cp_payload_t *this,payload_type_t type) +{ + this->next_payload = type; +} + +/** + * recompute the length of the payload. + */ +static void compute_length(private_cp_payload_t *this) +{ + iterator_t *iterator; + payload_t *current_attribute; + size_t length = CP_PAYLOAD_HEADER_LENGTH; + + iterator = this->attributes->create_iterator(this->attributes,TRUE); + while (iterator->iterate(iterator, (void**)¤t_attribute)) + { + length += current_attribute->get_length(current_attribute); + } + iterator->destroy(iterator); + + this->payload_length = length; +} + +/** + * Implementation of payload_t.get_length. + */ +static size_t get_length(private_cp_payload_t *this) +{ + compute_length(this); + return this->payload_length; +} + +/** + * Implementation of cp_payload_t.create_configuration_attribute_iterator. + */ +static iterator_t *create_attribute_iterator (private_cp_payload_t *this) +{ + return this->attributes->create_iterator(this->attributes, TRUE); +} + +/** + * Implementation of cp_payload_t.add_proposal_substructure. + */ +static void add_configuration_attribute (private_cp_payload_t *this,configuration_attribute_t *attribute) +{ + this->attributes->insert_last(this->attributes,(void *) attribute); + compute_length(this); +} + +/** + * Implementation of cp_payload_t.set_config_type. + */ +static void set_config_type (private_cp_payload_t *this,config_type_t config_type) +{ + this->config_type = config_type; +} + +/** + * Implementation of cp_payload_t.get_config_type. + */ +static config_type_t get_config_type (private_cp_payload_t *this) +{ + return this->config_type; +} + +/** + * Implementation of payload_t.destroy and cp_payload_t.destroy. + */ +static void destroy(private_cp_payload_t *this) +{ + this->attributes->destroy_offset(this->attributes, + offsetof(configuration_attribute_t, destroy)); + free(this); +} + +/* + * Described in header. + */ +cp_payload_t *cp_payload_create() +{ + private_cp_payload_t *this = malloc_thing(private_cp_payload_t); + + /* public interface */ + 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_type; + this->public.payload_interface.destroy = (void (*) (payload_t *))destroy; + + /* public functions */ + this->public.create_attribute_iterator = (iterator_t* (*) (cp_payload_t *)) create_attribute_iterator; + this->public.add_configuration_attribute = (void (*) (cp_payload_t *,configuration_attribute_t *)) add_configuration_attribute; + this->public.set_config_type = (void (*) (cp_payload_t *, config_type_t)) set_config_type; + this->public.get_config_type = (config_type_t (*) (cp_payload_t *)) get_config_type; + this->public.destroy = (void (*) (cp_payload_t *)) destroy; + + /* set default values of the fields */ + this->critical = FALSE; + this->next_payload = NO_PAYLOAD; + this->payload_length = CP_PAYLOAD_HEADER_LENGTH; + + this->attributes = linked_list_create(); + return (&(this->public)); +} |