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Diffstat (limited to 'Source/charon/payloads/proposal_substructure.c')
| -rw-r--r-- | Source/charon/payloads/proposal_substructure.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/Source/charon/payloads/proposal_substructure.c b/Source/charon/payloads/proposal_substructure.c new file mode 100644 index 000000000..509e2bc80 --- /dev/null +++ b/Source/charon/payloads/proposal_substructure.c @@ -0,0 +1,223 @@ +/** + * @file proposal_substructure.h + * + * @brief Declaration of the class proposal_substructure_t. + * + * An object of this type represents an IKEv2 PROPOSAL Substructure and contains transforms. + * + */ + +/* + * 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. + */ + /* offsetof macro */ +#include <stddef.h> + +#include "proposal_substructure.h" + +#include "encodings.h" +#include "../types.h" +#include "../utils/allocator.h" +#include "../utils/linked_list.h" + +/** + * Private data of an proposal_substructure_t' Object + * + */ +typedef struct private_proposal_substructure_s private_proposal_substructure_t; + +struct private_proposal_substructure_s { + /** + * public proposal_substructure_t interface + */ + proposal_substructure_t public; + + /** + * next payload type + */ + u_int8_t next_payload; + + + /** + * Length of this payload + */ + u_int16_t proposal_length; + + + /** + * Proposal number + */ + u_int8_t proposal_number; + + /** + * Protocol ID + */ + u_int8_t protocol_id; + + /** + * SPI size of the following SPI + */ + u_int8_t spi_size; + + /** + * Number of transforms + */ + u_int8_t transforms_count; + + /** + * SPI is stored as chunk + */ + chunk_t spi; + + /** + * Transforms are stored in a linked_list_t + */ + linked_list_t * transforms; +}; + +/** + * Encoding rules to parse or generate a Proposal substructure + * + * The defined offsets are the positions in a object of type + * private_proposal_substructure_t. + * + */ +encoding_rule_t proposal_substructure_encodings[] = { + /* 1 Byte next payload type, stored in the field next_payload */ + { U_INT_8, offsetof(private_proposal_substructure_t, next_payload) }, + /* Reserved Byte is skipped */ + { RESERVED_BYTE, 0 }, + /* Length of the whole SA payload*/ + { PAYLOAD_LENGTH, offsetof(private_proposal_substructure_t, proposal_length) }, + /* proposal number is a number of 8 bit */ + { U_INT_8, offsetof(private_proposal_substructure_t, proposal_number) }, + /* protocol ID is a number of 8 bit */ + { U_INT_8, offsetof(private_proposal_substructure_t, protocol_id) }, + /* SPI Size has its own type */ + { SPI_SIZE, offsetof(private_proposal_substructure_t, spi_size) }, + /* Number of transforms is a number of 8 bit */ + { U_INT_8, offsetof(private_proposal_substructure_t, transforms_count) }, + /* SPI is a chunk of variable size*/ + { SPI, offsetof(private_proposal_substructure_t, spi) }, + /* Transforms are stored in a transform substructure, + offset points to a linked_list_t pointer */ + { TRANSFORMS, offsetof(private_proposal_substructure_t, transforms) } +}; + +/** + * Implements payload_t's and proposal_substructure_t's destroy function. + * See #payload_s.destroy or proposal_substructure_s.destroy for description. + */ +static status_t destroy(private_proposal_substructure_t *this) +{ + /* all proposals are getting destroyed */ + while (this->transforms->get_count(this->transforms) > 0) + { + transforms_substructure_t *current_transform; + if (this->transforms->remove_last(this->transforms,(void **)¤t_transform) != SUCCESS) + { + break; + } + current_transform->destroy(current_transform); + } + this->transforms->destroy(this->transforms); + + if (this->spi.ptr != NULL) + { + allocator_free(this->spi.ptr); + } + + allocator_free(this); + + return SUCCESS; +} + +/** + * Implements payload_t's get_encoding_rules function. + * See #payload_s.get_encoding_rules for description. + */ +static status_t get_encoding_rules(private_proposal_substructure_t *this, encoding_rule_t **rules, size_t *rule_count) +{ + *rules = proposal_substructure_encodings; + *rule_count = sizeof(proposal_substructure_encodings) / sizeof(encoding_rule_t); + + return SUCCESS; +} + +/** + * Implements payload_t's get_type function. + * See #payload_s.get_type for description. + */ +static payload_type_t get_type(private_proposal_substructure_t *this) +{ + return PROPOSAL_SUBSTRUCTURE; +} + +/** + * Implements payload_t's get_next_type function. + * See #payload_s.get_next_type for description. + */ +static payload_type_t get_next_type(private_proposal_substructure_t *this) +{ + return (this->next_payload); +} + +/** + * Implements payload_t's get_length function. + * See #payload_s.get_length for description. + */ +static size_t get_length(private_proposal_substructure_t *this) +{ + return this->proposal_length; +} + +/* + * Described in header + */ +proposal_substructure_t *proposal_substructure_create() +{ + private_proposal_substructure_t *this = allocator_alloc_thing(private_proposal_substructure_t); + if (this == NULL) + { + return NULL; + } + + this->public.payload_interface.get_encoding_rules = (status_t (*) (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.get_type = (payload_type_t (*) (payload_t *)) get_type; + this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy; + this->public.destroy = (status_t (*) (proposal_substructure_t *)) destroy; + + /* set default values of the fields */ + this->next_payload = NO_PAYLOAD; + this->proposal_length = 0; + this->proposal_number = 0; + this->protocol_id = 0; + this->transforms_count = 0; + this->spi_size = 0; + this->spi.ptr = NULL; + this->spi.len = 0; + + this->transforms = linked_list_create(); + + if (this->transforms == NULL) + { + allocator_free(this); + return NULL; + } + return (&(this->public)); +} + + |