/* * Copyright (C) 2005-2009 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 . * * 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 #include "cp_payload.h" #include #include 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; /** * List of attributes, as configuration_attribute_t */ linked_list_t *attributes; /** * Config Type. */ u_int8_t 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, 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; enumerator_t *enumerator; payload_t *attribute; enumerator = this->attributes->create_enumerator(this->attributes); while (enumerator->enumerate(enumerator, &attribute)) { status = attribute->verify(attribute); if (status != SUCCESS) { break; } } enumerator->destroy(enumerator); 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) { enumerator_t *enumerator; payload_t *attribute; this->payload_length = CP_PAYLOAD_HEADER_LENGTH; enumerator = this->attributes->create_enumerator(this->attributes); while (enumerator->enumerate(enumerator, &attribute)) { this->payload_length += attribute->get_length(attribute); } enumerator->destroy(enumerator); } /** * Implementation of payload_t.get_length. */ static size_t get_length(private_cp_payload_t *this) { return this->payload_length; } /** * Implementation of cp_payload_t.create_attribute_enumerator. */ static enumerator_t *create_attribute_enumerator(private_cp_payload_t *this) { return this->attributes->create_enumerator(this->attributes); } /** * Implementation of cp_payload_t.add_attribute. */ static void add_attribute(private_cp_payload_t *this, configuration_attribute_t *attribute) { this->attributes->insert_last(this->attributes, attribute); compute_length(this); } /** * Implementation of cp_payload_t.get_type. */ static config_type_t get_config_type(private_cp_payload_t *this) { return this->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); 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; this->public.create_attribute_enumerator = (enumerator_t*(*)(cp_payload_t *))create_attribute_enumerator; this->public.add_attribute = (void (*) (cp_payload_t *,configuration_attribute_t*))add_attribute; this->public.get_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(); this->type = CFG_REQUEST; return &this->public; } /* * Described in header. */ cp_payload_t *cp_payload_create_type(config_type_t type) { private_cp_payload_t *this = (private_cp_payload_t*)cp_payload_create(); this->type = type; return &this->public; }