diff options
Diffstat (limited to 'src/libcharon/encoding/payloads/configuration_attribute.c')
| -rw-r--r-- | src/libcharon/encoding/payloads/configuration_attribute.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/src/libcharon/encoding/payloads/configuration_attribute.c b/src/libcharon/encoding/payloads/configuration_attribute.c new file mode 100644 index 000000000..9094fd44d --- /dev/null +++ b/src/libcharon/encoding/payloads/configuration_attribute.c @@ -0,0 +1,264 @@ +/* + * 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 <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. + */ + +#include <stddef.h> + +#include "configuration_attribute.h" + +#include <encoding/payloads/encodings.h> +#include <library.h> +#include <daemon.h> + + +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; +} + |