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Diffstat (limited to 'Source/charon/payloads/sa_payload.c')
| -rw-r--r-- | Source/charon/payloads/sa_payload.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/Source/charon/payloads/sa_payload.c b/Source/charon/payloads/sa_payload.c new file mode 100644 index 000000000..a58570c42 --- /dev/null +++ b/Source/charon/payloads/sa_payload.c @@ -0,0 +1,191 @@ +/** + * @file sa_payload.h + * + * @brief Declaration of the class sa_payload_t. + * + * An object of this type represents an IKEv2 SA-Payload and contains proposal + * substructures. + * + */ + +/* + * 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 "sa_payload.h" + +#include "encodings.h" +#include "../utils/allocator.h" +#include "../utils/linked_list.h" + + +/** + * Private data of an sa_payload_t' Object + * + */ +typedef struct private_sa_payload_s private_sa_payload_t; + +struct private_sa_payload_s { + /** + * public sa_payload_t interface + */ + sa_payload_t public; + + /** + * next payload type + */ + u_int8_t next_payload; + + /** + * Critical flag + */ + bool critical; + + /** + * Length of this payload + */ + u_int16_t payload_length; + + /** + * Proposals in this payload are stored in a linked_list_t + */ + linked_list_t * proposals; +}; + +/** + * Encoding rules to parse or generate a IKEv2-Header + * + * The defined offsets are the positions in a object of type + * private_sa_payload_t. + * + */ +encoding_rule_t sa_payload_encodings[] = { + /* 1 Byte next payload type, stored in the field next_payload */ + { U_INT_8, offsetof(private_sa_payload_t, next_payload) }, + /* the critical bit */ + { FLAG, offsetof(private_sa_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 SA payload*/ + { PAYLOAD_LENGTH, offsetof(private_sa_payload_t, payload_length) }, + /* Proposals are stored in a proposal substructure, + offset points to a linked_list_t pointer */ + { PROPOSALS, offsetof(private_sa_payload_t, proposals) } +}; + +/** + * Implements payload_t's and sa_payload_t's destroy function. + * See #payload_s.destroy or sa_payload_s.destroy for description. + */ +static status_t destroy(private_sa_payload_t *this) +{ + /* all proposals are getting destroyed */ + while (this->proposals->get_count(this->proposals) > 0) + { + proposal_substructure_t *current_proposal; + if (this->proposals->remove_last(this->proposals,(void **)¤t_proposal) != SUCCESS) + { + break; + } + current_proposal->destroy(current_proposal); + } + this->proposals->destroy(this->proposals); + + 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_sa_payload_t *this, encoding_rule_t **rules, size_t *rule_count) +{ + *rules = sa_payload_encodings; + *rule_count = sizeof(sa_payload_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_sa_payload_t *this) +{ + return SECURITY_ASSOCIATION; +} + +/** + * Implements payload_t's get_next_type function. + * See #payload_s.get_next_type for description. + */ +static payload_type_t get_next_type(private_sa_payload_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_sa_payload_t *this) +{ + return this->payload_length; +} + +/* + * Described in header + */ +sa_payload_t *sa_payload_create() +{ + private_sa_payload_t *this = allocator_alloc_thing(private_sa_payload_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 (*) (sa_payload_t *)) destroy; + + /* set default values of the fields */ + this->critical = SA_PAYLOAD_CRITICAL_FLAG; + this->next_payload = NO_PAYLOAD; + this->payload_length = SA_PAYLOAD_HEADER_LENGTH; + + this->proposals = linked_list_create(); + + if (this->proposals == NULL) + { + allocator_free(this); + return NULL; + } + return (&(this->public)); +} + + |