implemented and tested functionality to create sa_payload from
[strongswan.git] / Source / charon / encoding / payloads / sa_payload.c
index 4054c6f..d2aecf8 100644 (file)
@@ -243,11 +243,157 @@ static iterator_t *create_proposal_substructure_iterator (private_sa_payload_t *
  */
 static void add_proposal_substructure (private_sa_payload_t *this,proposal_substructure_t *proposal)
 {
+       status_t status;
+       if (this->proposals->get_count(this->proposals) > 0)
+       {
+               proposal_substructure_t *last_proposal;
+               status = this->proposals->get_last(this->proposals,(void **) &last_proposal);
+               /* last transform is now not anymore last one */
+               last_proposal->set_is_last_proposal(last_proposal,FALSE);
+       }
+       proposal->set_is_last_proposal(proposal,TRUE);
+       
        this->proposals->insert_last(this->proposals,(void *) proposal);
        this->compute_length(this);
 }
 
 /**
+ * Implementation of sa_payload_t.get_ike_proposals.
+ */
+static status_t get_ike_proposals (private_sa_payload_t *this,ike_proposal_t ** proposals, size_t *proposal_count)
+{
+       int found_ike_proposals = 0;
+       int current_proposal_number = 0;
+       iterator_t *iterator;
+       ike_proposal_t *tmp_proposals;
+       
+               
+       iterator = this->proposals->create_iterator(this->proposals,TRUE);
+       
+       /* first find out the number of ike proposals and check their number of transforms and 
+        * if the SPI is empty!*/
+       while (iterator->has_next(iterator))
+       {
+               proposal_substructure_t *current_proposal;
+               iterator->current(iterator,(void **)&(current_proposal));
+               if (current_proposal->get_protocol_id(current_proposal) == IKE)
+               {
+                       /* a ike proposal consists of 4 transforms and an empty spi*/
+                       if ((current_proposal->get_transform_count(current_proposal) != 4) ||
+                           (current_proposal->get_spi_size(current_proposal) != 0))
+                   {
+                       iterator->destroy(iterator);
+                       return FAILED;
+                   }
+                       
+                       found_ike_proposals++;
+               }
+       }
+       iterator->reset(iterator);
+       
+       if (found_ike_proposals == 0)
+       {
+               iterator->destroy(iterator);
+               return NOT_FOUND;
+       }
+       
+       /* allocate memory to hold each proposal as ike_proposal_t */
+       
+       tmp_proposals = allocator_alloc(found_ike_proposals * sizeof(ike_proposal_t));
+       
+       /* create from each proposal_substructure a ike_proposal_t data area*/
+       while (iterator->has_next(iterator))
+       {
+               proposal_substructure_t *current_proposal;
+               iterator->current(iterator,(void **)&(current_proposal));
+               if (current_proposal->get_protocol_id(current_proposal) == IKE)
+               {
+                       bool encryption_algorithm_found = FALSE;
+                       bool integrity_algorithm_found = FALSE;
+                       bool pseudo_random_function_found = FALSE;
+                       bool diffie_hellman_group_found = FALSE;
+                       status_t status;
+                       iterator_t *transforms;
+                       
+                       transforms = current_proposal->create_transform_substructure_iterator(current_proposal,TRUE);
+                       while (transforms->has_next(transforms))
+                       {
+                               transform_substructure_t *current_transform;
+                               transforms->current(transforms,(void **)&(current_transform));
+                               
+                               switch (current_transform->get_transform_type(current_transform))
+                               {
+                                       case ENCRYPTION_ALGORITHM:
+                                       {
+                                               tmp_proposals[current_proposal_number].encryption_algorithm = current_transform->get_transform_id(current_transform);
+                                               status = current_transform->get_key_length(current_transform,&(tmp_proposals[current_proposal_number].encryption_algorithm_key_length));
+                                               if (status == SUCCESS)
+                                               {
+                                                       encryption_algorithm_found = TRUE;
+                                               }
+                                               break;
+                                       }
+                                       case INTEGRITY_ALGORITHM:
+                                       {
+                                               tmp_proposals[current_proposal_number].integrity_algorithm = current_transform->get_transform_id(current_transform);
+                                               status = current_transform->get_key_length(current_transform,&(tmp_proposals[current_proposal_number].integrity_algorithm_key_length));
+                                               if (status == SUCCESS)
+                                               {
+                                                       integrity_algorithm_found = TRUE;
+                                               }
+                                               break;
+                                       }
+                                       case PSEUDO_RANDOM_FUNCTION:
+                                       {
+                                               tmp_proposals[current_proposal_number].pseudo_random_function = current_transform->get_transform_id(current_transform);
+                                               status = current_transform->get_key_length(current_transform,&(tmp_proposals[current_proposal_number].pseudo_random_function_key_length));
+                                               if (status == SUCCESS)
+                                               {
+                                                       pseudo_random_function_found = TRUE;
+                                               }
+                                               break;
+                                       }
+                                       case DIFFIE_HELLMAN_GROUP:
+                                       {
+                                               tmp_proposals[current_proposal_number].diffie_hellman_group = current_transform->get_transform_id(current_transform);
+                                               diffie_hellman_group_found = TRUE;
+                                               break;
+                                       }
+                                       default:
+                                       {
+                                               /* not a transform of an ike proposal. Break here */
+                                               break;
+                                       }
+                               }
+                               
+                       }
+
+                       transforms->destroy(transforms);
+                       
+                       if ((!encryption_algorithm_found) ||
+                               (!integrity_algorithm_found) ||
+                               (!pseudo_random_function_found) ||
+                               (!diffie_hellman_group_found))
+                       {
+                               /* one of needed transforms could not be found */
+                               iterator->reset(iterator);
+                               allocator_free(tmp_proposals);
+                               return FAILED;
+                       }
+                       
+                       current_proposal_number++;
+               }
+       }
+
+       iterator->destroy(iterator);    
+       
+       *proposals = tmp_proposals;
+       *proposal_count = found_ike_proposals;
+
+       return SUCCESS;
+}
+
+/**
  * Implementation of private_sa_payload_t.compute_length.
  */
 static void compute_length (private_sa_payload_t *this)
@@ -285,6 +431,7 @@ sa_payload_t *sa_payload_create()
        /* public functions */
        this->public.create_proposal_substructure_iterator = (iterator_t* (*) (sa_payload_t *,bool)) create_proposal_substructure_iterator;
        this->public.add_proposal_substructure = (void (*) (sa_payload_t *,proposal_substructure_t *)) add_proposal_substructure;
+       this->public.get_ike_proposals = (status_t (*) (sa_payload_t *, ike_proposal_t **, size_t *)) get_ike_proposals;
        this->public.destroy = (void (*) (sa_payload_t *)) destroy;
        
        /* private functions */
@@ -299,4 +446,43 @@ sa_payload_t *sa_payload_create()
        return (&(this->public));
 }
 
+/*
+ * Described in header.
+ */
+sa_payload_t *sa_payload_create_from_ike_proposals(ike_proposal_t *proposals, size_t proposal_count)
+{
+       int i;
+       sa_payload_t *sa_payload= sa_payload_create();
+       
+       for (i = 0; i < proposal_count; i++)
+       {
+               proposal_substructure_t *proposal_substructure;
+               transform_substructure_t *encryption_algorithm;
+               transform_substructure_t *integrity_algorithm;
+               transform_substructure_t *pseudo_random_function;
+               transform_substructure_t *diffie_hellman_group;
+               
+               /* create proposal substructure */
+               proposal_substructure = proposal_substructure_create();
+               proposal_substructure->set_protocol_id(proposal_substructure,IKE);
+               proposal_substructure->set_proposal_number(proposal_substructure,(i + 1));
 
+               /* create transform substructures to hold each specific transform for an ike proposal */
+               encryption_algorithm = transform_substructure_create_type(ENCRYPTION_ALGORITHM,proposals[i].encryption_algorithm,proposals[i].encryption_algorithm_key_length);
+               proposal_substructure->add_transform_substructure(proposal_substructure,encryption_algorithm);
+               
+               pseudo_random_function = transform_substructure_create_type(PSEUDO_RANDOM_FUNCTION,proposals[i].pseudo_random_function,proposals[i].pseudo_random_function_key_length);
+               proposal_substructure->add_transform_substructure(proposal_substructure,pseudo_random_function);
+
+               integrity_algorithm = transform_substructure_create_type(INTEGRITY_ALGORITHM,proposals[i].integrity_algorithm,proposals[i].integrity_algorithm_key_length);
+               proposal_substructure->add_transform_substructure(proposal_substructure,integrity_algorithm);
+
+               diffie_hellman_group = transform_substructure_create_type(DIFFIE_HELLMAN_GROUP,proposals[i].diffie_hellman_group,0);
+               proposal_substructure->add_transform_substructure(proposal_substructure,diffie_hellman_group);
+               
+               /* add proposal to sa payload */
+               sa_payload->add_proposal_substructure(sa_payload,proposal_substructure);
+       }
+       
+       return sa_payload;
+}