/* * 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 . * * 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. * * $Id: cp_payload.c 3589 2008-03-13 14:14:44Z martin $ */ #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; /** * 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)); }