Do not update payload length during generation, allows hooks override payload length

src/libcharon/encoding/payloads/ke_payload.c

@@ -146,7 +146,7 @@ static payload_type_t get_type(private_ke_payload_t *this)
  */
 static payload_type_t get_next_type(private_ke_payload_t *this)
 {
-	return (this->next_payload);
+	return this->next_payload;
 }
 
 /**
@@ -163,6 +163,7 @@ static void set_next_type(private_ke_payload_t *this,payload_type_t type)
 static void compute_length(private_ke_payload_t *this)
 {
 	size_t length = KE_PAYLOAD_HEADER_LENGTH;
+
 	if (this->key_exchange_data.ptr != NULL)
 	{
 		length += this->key_exchange_data.len;
@@ -175,7 +176,6 @@ static void compute_length(private_ke_payload_t *this)
  */
 static size_t get_length(private_ke_payload_t *this)
 {
-	compute_length(this);
 	return this->payload_length;
 }
 
@@ -184,26 +184,7 @@ static size_t get_length(private_ke_payload_t *this)
  */
 static chunk_t get_key_exchange_data(private_ke_payload_t *this)
 {
-	return (this->key_exchange_data);
-}
-
-/**
- * Implementation of ke_payload_t.set_key_exchange_data.
- */
-static void set_key_exchange_data(private_ke_payload_t *this, chunk_t key_exchange_data)
-{
-	/* destroy existing data first */
-	if (this->key_exchange_data.ptr != NULL)
-	{
-		/* free existing value */
-		free(this->key_exchange_data.ptr);
-		this->key_exchange_data.ptr = NULL;
-		this->key_exchange_data.len = 0;
-
-	}
-
-	this->key_exchange_data = chunk_clone(key_exchange_data);
-	compute_length(this);
+	return this->key_exchange_data;
 }
 
 /**
@@ -240,7 +221,6 @@ ke_payload_t *ke_payload_create()
 
 	/* public functions */
 	this->public.get_key_exchange_data = (chunk_t (*) (ke_payload_t *)) get_key_exchange_data;
-	this->public.set_key_exchange_data = (void (*) (ke_payload_t *,chunk_t)) set_key_exchange_data;
 	this->public.get_dh_group_number = (diffie_hellman_group_t (*) (ke_payload_t *)) get_dh_group_number;
 	this->public.set_dh_group_number =(void (*) (ke_payload_t *,diffie_hellman_group_t)) set_dh_group_number;
 	this->public.destroy = (void (*) (ke_payload_t *)) destroy;

src/libcharon/encoding/payloads/ke_payload.h

@@ -55,15 +55,6 @@ struct ke_payload_t {
 	 */
 	chunk_t (*get_key_exchange_data) (ke_payload_t *this);
 
-	/**
-	 * Sets the key exchange data of this KE payload.
-	 *
-	 * Value is getting copied.
-	 *
-	 * @param key_exchange_data chunk_t pointing to the value to set
-	 */
-	void (*set_key_exchange_data) (ke_payload_t *this, chunk_t key_exchange_data);
-
 	/**
 	 * Gets the Diffie-Hellman Group Number of this KE payload.
 	 *

src/libcharon/encoding/payloads/nonce_payload.c

@@ -78,7 +78,7 @@ encoding_rule_t nonce_payload_encodings[] = {
 	/* Length of the whole nonce payload*/
 	{ PAYLOAD_LENGTH,	offsetof(private_nonce_payload_t, payload_length) 	},
 	/* some nonce bytes, lenth is defined in PAYLOAD_LENGTH */
-	{ NONCE_DATA,			offsetof(private_nonce_payload_t, nonce) 		}
+	{ NONCE_DATA,		offsetof(private_nonce_payload_t, nonce) 			},
 };
 
 /*                           1                   2                   3
@@ -97,12 +97,10 @@ encoding_rule_t nonce_payload_encodings[] = {
  */
 static status_t verify(private_nonce_payload_t *this)
 {
-	if ((this->nonce.len < 16) || ((this->nonce.len > 256)))
+	if (this->nonce.len < 16 || this->nonce.len > 256)
 	{
-		/* nonce length is wrong */
 		return FAILED;
 	}
-
 	return SUCCESS;
 }
 
@@ -111,8 +109,7 @@ static status_t verify(private_nonce_payload_t *this)
  */
 static status_t set_nonce(private_nonce_payload_t *this, chunk_t nonce)
 {
-	this->nonce.ptr = clalloc(nonce.ptr, nonce.len);
-	this->nonce.len = nonce.len;
+	this->nonce = chunk_clone(nonce);
 	this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH + nonce.len;
 	return SUCCESS;
 }
@@ -122,10 +119,7 @@ static status_t set_nonce(private_nonce_payload_t *this, chunk_t nonce)
  */
 static chunk_t get_nonce(private_nonce_payload_t *this)
 {
-	chunk_t nonce;
-	nonce.ptr = clalloc(this->nonce.ptr,this->nonce.len);
-	nonce.len = this->nonce.len;
-	return nonce;
+	return chunk_clone(this->nonce);
 }
 
 /**
@@ -150,7 +144,7 @@ static payload_type_t get_type(private_nonce_payload_t *this)
  */
 static payload_type_t get_next_type(private_nonce_payload_t *this)
 {
-	return (this->next_payload);
+	return this->next_payload;
 }
 
 /**
@@ -161,20 +155,11 @@ static void set_next_type(private_nonce_payload_t *this,payload_type_t type)
 	this->next_payload = type;
 }
 
-/**
- * recompute the length of the payload.
- */
-static void compute_length(private_nonce_payload_t *this)
-{
-	this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH + this->nonce.len;
-}
-
 /**
  * Implementation of payload_t.get_length.
  */
 static size_t get_length(private_nonce_payload_t *this)
 {
-	compute_length(this);
 	return this->payload_length;
 }
 
@@ -187,7 +172,6 @@ static void destroy(private_nonce_payload_t *this)
 	{
 		free(this->nonce.ptr);
 	}
-
 	free(this);
 }
 

src/libcharon/encoding/payloads/notify_payload.c

@@ -459,7 +459,6 @@ static void compute_length (private_notify_payload_t *this)
  */
 static size_t get_length(private_notify_payload_t *this)
 {
-	compute_length(this);
 	return this->payload_length;
 }
 

src/libcharon/encoding/payloads/proposal_substructure.c

@@ -234,7 +234,6 @@ static void compute_length(private_proposal_substructure_t *this)
 METHOD(payload_t, get_length, size_t,
 	private_proposal_substructure_t *this)
 {
-	compute_length(this);
 	return this->proposal_length;
 }
 
@@ -366,6 +365,7 @@ METHOD(proposal_substructure_t, clone_, proposal_substructure_t*,
 		add_transform_substructure(clone, current);
 	}
 	enumerator->destroy(enumerator);
+	compute_length(clone);
 
 	return &clone->public;
 }
@@ -409,6 +409,7 @@ proposal_substructure_t *proposal_substructure_create()
 			.destroy = _destroy,
 		},
 		.next_payload = NO_PAYLOAD,
+		.proposal_length = PROPOSAL_SUBSTRUCTURE_HEADER_LENGTH,
 		.transforms = linked_list_create(),
 	);
 
@@ -500,6 +501,7 @@ proposal_substructure_t *proposal_substructure_create_from_proposal(
 	}
 	this->proposal_number = proposal->get_number(proposal);
 	this->protocol_id = proposal->get_protocol(proposal);
+	compute_length(this);
 
 	return &this->public;
 }

src/libcharon/encoding/payloads/sa_payload.c

@@ -185,7 +185,6 @@ static void compute_length(private_sa_payload_t *this)
 METHOD(payload_t, get_length, size_t,
 	private_sa_payload_t *this)
 {
-	compute_length(this);
 	return this->payload_length;
 }
 

src/libcharon/encoding/payloads/transform_substructure.c

@@ -203,7 +203,6 @@ static void compute_length (private_transform_substructure_t *this)
  */
 static size_t get_length(private_transform_substructure_t *this)
 {
-	compute_length(this);
 	return this->transform_length;
 }
 

src/libcharon/encoding/payloads/ts_payload.c

@@ -206,7 +206,6 @@ static void compute_length (private_ts_payload_t *this)
  */
 static size_t get_length(private_ts_payload_t *this)
 {
-	compute_length(this);
 	return this->payload_length;
 }
 
@@ -233,6 +232,7 @@ static void add_traffic_selector_substructure (private_ts_payload_t *this,traffi
 {
 	this->traffic_selectors->insert_last(this->traffic_selectors,traffic_selector);
 	this->number_of_traffic_selectors = this->traffic_selectors->get_count(this->traffic_selectors);
+	compute_length(this);
 }
 
 /**