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-rw-r--r--src/libcharon/encoding/payloads/transform_substructure.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/src/libcharon/encoding/payloads/transform_substructure.c b/src/libcharon/encoding/payloads/transform_substructure.c
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+/*
+ * 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 <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 "transform_substructure.h"
+
+#include <encoding/payloads/transform_attribute.h>
+#include <encoding/payloads/encodings.h>
+#include <library.h>
+#include <utils/linked_list.h>
+#include <daemon.h>
+
+
+typedef struct private_transform_substructure_t private_transform_substructure_t;
+
+/**
+ * Private data of an transform_substructure_t object.
+ *
+ */
+struct private_transform_substructure_t {
+ /**
+ * Public transform_substructure_t interface.
+ */
+ transform_substructure_t public;
+
+ /**
+ * Next payload type.
+ */
+ u_int8_t next_payload;
+
+
+ /**
+ * Length of this payload.
+ */
+ u_int16_t transform_length;
+
+
+ /**
+ * Type of the transform.
+ */
+ u_int8_t transform_type;
+
+ /**
+ * Transform ID.
+ */
+ u_int16_t transform_id;
+
+ /**
+ * Transforms Attributes are stored in a linked_list_t.
+ */
+ linked_list_t *attributes;
+};
+
+
+/**
+ * Encoding rules to parse or generate a Transform substructure.
+ *
+ * The defined offsets are the positions in a object of type
+ * private_transform_substructure_t.
+ *
+ */
+encoding_rule_t transform_substructure_encodings[] = {
+ /* 1 Byte next payload type, stored in the field next_payload */
+ { U_INT_8, offsetof(private_transform_substructure_t, next_payload) },
+ /* Reserved Byte is skipped */
+ { RESERVED_BYTE, 0 },
+ /* Length of the whole transform substructure*/
+ { PAYLOAD_LENGTH, offsetof(private_transform_substructure_t, transform_length) },
+ /* transform type is a number of 8 bit */
+ { U_INT_8, offsetof(private_transform_substructure_t, transform_type) },
+ /* Reserved Byte is skipped */
+ { RESERVED_BYTE, 0 },
+ /* tranform ID is a number of 8 bit */
+ { U_INT_16, offsetof(private_transform_substructure_t, transform_id) },
+ /* Attributes are stored in a transform attribute,
+ offset points to a linked_list_t pointer */
+ { TRANSFORM_ATTRIBUTES, offsetof(private_transform_substructure_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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! 0 (last) or 3 ! RESERVED ! Transform Length !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ !Transform Type ! RESERVED ! Transform ID !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! !
+ ~ Transform Attributes ~
+ ! !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+
+/**
+ * Implementation of payload_t.verify.
+ */
+static status_t verify(private_transform_substructure_t *this)
+{
+ status_t status = SUCCESS;
+ iterator_t *iterator;
+ payload_t *current_attributes;
+
+ if ((this->next_payload != NO_PAYLOAD) && (this->next_payload != 3))
+ {
+ /* must be 0 or 3 */
+ DBG1(DBG_ENC, "inconsistent next payload");
+ return FAILED;
+ }
+
+ switch (this->transform_type)
+ {
+ case ENCRYPTION_ALGORITHM:
+ case PSEUDO_RANDOM_FUNCTION:
+ case INTEGRITY_ALGORITHM:
+ case DIFFIE_HELLMAN_GROUP:
+ case EXTENDED_SEQUENCE_NUMBERS:
+ /* we don't check transform ID, we want to reply
+ * cleanly with NO_PROPOSAL_CHOSEN or so if we don't support it */
+ break;
+ default:
+ {
+ DBG1(DBG_ENC, "invalid transform type: %d", this->transform_type);
+ return FAILED;
+ }
+ }
+ iterator = this->attributes->create_iterator(this->attributes,TRUE);
+
+ while(iterator->iterate(iterator, (void**)&current_attributes))
+ {
+ status = current_attributes->verify(current_attributes);
+ if (status != SUCCESS)
+ {
+ DBG1(DBG_ENC, "TRANSFORM_ATTRIBUTE verification failed");
+ }
+ }
+ iterator->destroy(iterator);
+
+ /* proposal number is checked in SA payload */
+ return status;
+}
+
+/**
+ * Implementation of payload_t.get_encoding_rules.
+ */
+static void get_encoding_rules(private_transform_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
+{
+ *rules = transform_substructure_encodings;
+ *rule_count = sizeof(transform_substructure_encodings) / sizeof(encoding_rule_t);
+}
+
+/**
+ * Implementation of payload_t.get_type.
+ */
+static payload_type_t get_type(private_transform_substructure_t *this)
+{
+ return TRANSFORM_SUBSTRUCTURE;
+}
+
+/**
+ * Implementation of payload_t.get_next_type.
+ */
+static payload_type_t get_next_type(private_transform_substructure_t *this)
+{
+ return (this->next_payload);
+}
+
+/**
+ * recompute the length of the payload.
+ */
+static void compute_length (private_transform_substructure_t *this)
+{
+ iterator_t *iterator;
+ payload_t *current_attribute;
+ size_t length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
+
+ iterator = this->attributes->create_iterator(this->attributes,TRUE);
+ while (iterator->iterate(iterator, (void**)&current_attribute))
+ {
+ length += current_attribute->get_length(current_attribute);
+ }
+ iterator->destroy(iterator);
+
+ this->transform_length = length;
+}
+
+/**
+ * Implementation of payload_t.get_length.
+ */
+static size_t get_length(private_transform_substructure_t *this)
+{
+ compute_length(this);
+ return this->transform_length;
+}
+
+/**
+ * Implementation of transform_substructure_t.create_transform_attribute_iterator.
+ */
+static iterator_t *create_transform_attribute_iterator (private_transform_substructure_t *this,bool forward)
+{
+ return this->attributes->create_iterator(this->attributes,forward);
+}
+
+/**
+ * Implementation of transform_substructure_t.add_transform_attribute.
+ */
+static void add_transform_attribute (private_transform_substructure_t *this,transform_attribute_t *attribute)
+{
+ this->attributes->insert_last(this->attributes,(void *) attribute);
+ compute_length(this);
+}
+
+/**
+ * Implementation of transform_substructure_t.set_is_last_transform.
+ */
+static void set_is_last_transform (private_transform_substructure_t *this, bool is_last)
+{
+ this->next_payload = (is_last) ? 0: TRANSFORM_TYPE_VALUE;
+}
+
+/**
+ * Implementation of transform_substructure_t.get_is_last_transform.
+ */
+static bool get_is_last_transform (private_transform_substructure_t *this)
+{
+ return ((this->next_payload == TRANSFORM_TYPE_VALUE) ? FALSE : TRUE);
+}
+
+/**
+ * Implementation of payload_t.set_next_type.
+ */
+static void set_next_type(private_transform_substructure_t *this,payload_type_t type)
+{
+}
+
+/**
+ * Implementation of transform_substructure_t.set_transform_type.
+ */
+static void set_transform_type (private_transform_substructure_t *this,u_int8_t type)
+{
+ this->transform_type = type;
+}
+
+/**
+ * Implementation of transform_substructure_t.get_transform_type.
+ */
+static u_int8_t get_transform_type (private_transform_substructure_t *this)
+{
+ return this->transform_type;
+}
+
+/**
+ * Implementation of transform_substructure_t.set_transform_id.
+ */
+static void set_transform_id (private_transform_substructure_t *this,u_int16_t id)
+{
+ this->transform_id = id;
+}
+
+/**
+ * Implementation of transform_substructure_t.get_transform_id.
+ */
+static u_int16_t get_transform_id (private_transform_substructure_t *this)
+{
+ return this->transform_id;
+}
+
+/**
+ * Implementation of transform_substructure_t.clone.
+ */
+static transform_substructure_t *clone_(private_transform_substructure_t *this)
+{
+ private_transform_substructure_t *clone;
+ iterator_t *attributes;
+ transform_attribute_t *current_attribute;
+
+ clone = (private_transform_substructure_t *) transform_substructure_create();
+ clone->next_payload = this->next_payload;
+ clone->transform_type = this->transform_type;
+ clone->transform_id = this->transform_id;
+
+ attributes = this->attributes->create_iterator(this->attributes, FALSE);
+ while (attributes->iterate(attributes, (void**)&current_attribute))
+ {
+ current_attribute = current_attribute->clone(current_attribute);
+ clone->public.add_transform_attribute(&clone->public, current_attribute);
+ }
+ attributes->destroy(attributes);
+
+ return &clone->public;
+}
+
+
+/**
+ * Implementation of transform_substructure_t.get_key_length.
+ */
+static status_t get_key_length(private_transform_substructure_t *this, u_int16_t *key_length)
+{
+ iterator_t *attributes;
+ transform_attribute_t *current_attribute;
+
+ attributes = this->attributes->create_iterator(this->attributes, TRUE);
+ while (attributes->iterate(attributes, (void**)&current_attribute))
+ {
+ if (current_attribute->get_attribute_type(current_attribute) == KEY_LENGTH)
+ {
+ *key_length = current_attribute->get_value(current_attribute);
+ attributes->destroy(attributes);
+ return SUCCESS;
+ }
+ }
+ attributes->destroy(attributes);
+ return FAILED;
+}
+
+
+/**
+ * Implementation of transform_substructure_t.destroy and payload_t.destroy.
+ */
+static void destroy(private_transform_substructure_t *this)
+{
+ this->attributes->destroy_offset(this->attributes,
+ offsetof(transform_attribute_t, destroy));
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+transform_substructure_t *transform_substructure_create()
+{
+ private_transform_substructure_t *this = malloc_thing(private_transform_substructure_t);
+
+ /* payload 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_transform_attribute_iterator = (iterator_t * (*) (transform_substructure_t *,bool)) create_transform_attribute_iterator;
+ this->public.add_transform_attribute = (void (*) (transform_substructure_t *,transform_attribute_t *)) add_transform_attribute;
+ this->public.set_is_last_transform = (void (*) (transform_substructure_t *,bool)) set_is_last_transform;
+ this->public.get_is_last_transform = (bool (*) (transform_substructure_t *)) get_is_last_transform;
+ this->public.set_transform_type = (void (*) (transform_substructure_t *,u_int8_t)) set_transform_type;
+ this->public.get_transform_type = (u_int8_t (*) (transform_substructure_t *)) get_transform_type;
+ this->public.set_transform_id = (void (*) (transform_substructure_t *,u_int16_t)) set_transform_id;
+ this->public.get_transform_id = (u_int16_t (*) (transform_substructure_t *)) get_transform_id;
+ this->public.get_key_length = (status_t (*) (transform_substructure_t *,u_int16_t *)) get_key_length;
+ this->public.clone = (transform_substructure_t* (*) (transform_substructure_t *)) clone_;
+ this->public.destroy = (void (*) (transform_substructure_t *)) destroy;
+
+ /* set default values of the fields */
+ this->next_payload = NO_PAYLOAD;
+ this->transform_length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
+ this->transform_id = 0;
+ this->transform_type = 0;
+ this->attributes = linked_list_create();
+
+ return (&(this->public));
+}
+
+/*
+ * Described in header
+ */
+transform_substructure_t *transform_substructure_create_type(
+ transform_type_t transform_type,
+ u_int16_t transform_id, u_int16_t key_length)
+{
+ transform_substructure_t *transform = transform_substructure_create();
+
+ transform->set_transform_type(transform,transform_type);
+ transform->set_transform_id(transform,transform_id);
+
+ if (key_length)
+ {
+ transform_attribute_t *attribute;
+
+ attribute = transform_attribute_create_key_length(key_length);
+ transform->add_transform_attribute(transform, attribute);
+
+ }
+ return transform;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 21:00:11 +0000