/* * 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 "configuration_attribute.h" #include #include #include typedef struct private_configuration_attribute_t private_configuration_attribute_t; /** * Private data of an configuration_attribute_t object. * */ struct private_configuration_attribute_t { /** * Public configuration_attribute_t interface. */ configuration_attribute_t public; /** * Type of the attribute. */ u_int16_t type; /** * Length of the attribute. */ u_int16_t length; /** * Attribute value as chunk. */ chunk_t value; }; /** * Encoding rules to parse or generate a configuration attribute. * * The defined offsets are the positions in a object of type * private_configuration_attribute_t. */ encoding_rule_t configuration_attribute_encodings[] = { { RESERVED_BIT, 0 }, /* type of the attribute as 15 bit unsigned integer */ { ATTRIBUTE_TYPE, offsetof(private_configuration_attribute_t, type) }, /* Length of attribute value */ { CONFIGURATION_ATTRIBUTE_LENGTH, offsetof(private_configuration_attribute_t, length) }, /* Value of attribute if attribute format flag is zero */ { CONFIGURATION_ATTRIBUTE_VALUE, offsetof(private_configuration_attribute_t, value) } }; /* 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ !R| Attribute Type ! Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ Value ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /** * Implementation of payload_t.verify. */ static status_t verify(private_configuration_attribute_t *this) { bool failed = FALSE; if (this->length != this->value.len) { DBG1(DBG_ENC, "invalid attribute length"); return FAILED; } switch (this->type) { case INTERNAL_IP4_ADDRESS: case INTERNAL_IP4_NETMASK: case INTERNAL_IP4_DNS: case INTERNAL_IP4_NBNS: case INTERNAL_ADDRESS_EXPIRY: case INTERNAL_IP4_DHCP: if (this->length != 0 && this->length != 4) { failed = TRUE; } break; case INTERNAL_IP4_SUBNET: if (this->length != 0 && this->length != 8) { failed = TRUE; } break; case INTERNAL_IP6_ADDRESS: case INTERNAL_IP6_SUBNET: if (this->length != 0 && this->length != 17) { failed = TRUE; } break; case INTERNAL_IP6_DNS: case INTERNAL_IP6_NBNS: case INTERNAL_IP6_DHCP: if (this->length != 0 && this->length != 16) { failed = TRUE; } break; case SUPPORTED_ATTRIBUTES: if (this->length % 2) { failed = TRUE; } break; case APPLICATION_VERSION: /* any length acceptable */ break; default: DBG1(DBG_ENC, "unknown attribute type %N", configuration_attribute_type_names, this->type); break; } if (failed) { DBG1(DBG_ENC, "invalid attribute length %d for %N", this->length, configuration_attribute_type_names, this->type); return FAILED; } return SUCCESS; } /** * Implementation of payload_t.get_encoding_rules. */ static void get_encoding_rules(private_configuration_attribute_t *this, encoding_rule_t **rules, size_t *rule_count) { *rules = configuration_attribute_encodings; *rule_count = sizeof(configuration_attribute_encodings) / sizeof(encoding_rule_t); } /** * Implementation of payload_t.get_type. */ static payload_type_t get_type(private_configuration_attribute_t *this) { return CONFIGURATION_ATTRIBUTE; } /** * Implementation of payload_t.get_next_type. */ static payload_type_t get_next_type(private_configuration_attribute_t *this) { return NO_PAYLOAD; } /** * Implementation of payload_t.set_next_type. */ static void set_next_type(private_configuration_attribute_t *this, payload_type_t type) { } /** * Implementation of configuration_attribute_t.get_length. */ static size_t get_length(private_configuration_attribute_t *this) { return this->value.len + CONFIGURATION_ATTRIBUTE_HEADER_LENGTH; } /** * Implementation of configuration_attribute_t.get_type. */ static configuration_attribute_type_t get_configuration_attribute_type( private_configuration_attribute_t *this) { return this->type; } /** * Implementation of configuration_attribute_t.get_value. */ static chunk_t get_value(private_configuration_attribute_t *this) { return this->value; } /** * Implementation of configuration_attribute_t.destroy and payload_t.destroy. */ static void destroy(private_configuration_attribute_t *this) { free(this->value.ptr); free(this); } /* * Described in header. */ configuration_attribute_t *configuration_attribute_create() { private_configuration_attribute_t *this; this = malloc_thing(private_configuration_attribute_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.get_value = (chunk_t(*)(configuration_attribute_t *))get_value; this->public.get_type = (configuration_attribute_type_t(*)(configuration_attribute_t *))get_configuration_attribute_type; this->public.destroy = (void (*)(configuration_attribute_t*))destroy; this->type = 0; this->value = chunk_empty; this->length = 0; return &this->public; } /* * Described in header. */ configuration_attribute_t *configuration_attribute_create_value( configuration_attribute_type_t type, chunk_t value) { private_configuration_attribute_t *this; this = (private_configuration_attribute_t*)configuration_attribute_create(); this->type = ((u_int16_t)type) & 0x7FFF; this->value = chunk_clone(value); this->length = value.len; return &this->public; }