open5gs/lib/asn/src/s1ap_decoder.c

#include "core_debug.h"

#include "s1ap_message.h"

void free_wrapper(void *ptr)
{
    free(ptr);
    ptr = NULL;
}

static int s1ap_decode_initiating(s1ap_message *message,
  S1ap_InitiatingMessage_t *initiating_p)
{
    int ret;
    char *message_string = NULL;

    d_assert(initiating_p, return -1, "Null param");
    message_string = calloc (10000, sizeof (char));
    s1ap_string_total_size = 0;

    switch (initiating_p->procedureCode) 
    {
        case S1ap_ProcedureCode_id_uplinkNASTransport: 
        {
            ret = s1ap_decode_s1ap_uplinknastransport_ies(
                    &message->msg.s1ap_UplinkNASTransport_IEs, 
                    &initiating_p->value);
            s1ap_xer_print_s1ap_uplinknastransport(s1ap_xer__print2sp, 
                    message_string, message);
        }
        break;

        case S1ap_ProcedureCode_id_S1Setup: 
        {
            ret = s1ap_decode_s1ap_s1setuprequesties(
                    &message->msg.s1ap_S1SetupRequestIEs, 
                    &initiating_p->value);
            s1ap_xer_print_s1ap_s1setuprequest(s1ap_xer__print2sp, 
                    message_string, message);
        }
        break;

        case S1ap_ProcedureCode_id_initialUEMessage: 
        {
            ret = s1ap_decode_s1ap_initialuemessage_ies(
                    &message->msg.s1ap_InitialUEMessage_IEs, 
                    &initiating_p->value);
            s1ap_xer_print_s1ap_initialuemessage(s1ap_xer__print2sp, 
                    message_string, message);
        }
        break;

        case S1ap_ProcedureCode_id_UEContextReleaseRequest: 
        {
            ret = s1ap_decode_s1ap_uecontextreleaserequest_ies(
                    &message->msg.s1ap_UEContextReleaseRequest_IEs, &initiating_p->value);
            s1ap_xer_print_s1ap_uecontextreleaserequest(
                    s1ap_xer__print2sp, message_string, message);
        }
        break;

        case S1ap_ProcedureCode_id_UECapabilityInfoIndication: 
        {
            ret = s1ap_decode_s1ap_uecapabilityinfoindicationies(
                    &message->msg.s1ap_UECapabilityInfoIndicationIEs, 
                    &initiating_p->value);
            s1ap_xer_print_s1ap_uecapabilityinfoindication(
                    s1ap_xer__print2sp, message_string, message);
        }
        break;

        case S1ap_ProcedureCode_id_NASNonDeliveryIndication: 
        {
            ret = s1ap_decode_s1ap_nasnondeliveryindication_ies(
                    &message->msg.s1ap_NASNonDeliveryIndication_IEs, 
                    &initiating_p->value);
            s1ap_xer_print_s1ap_nasnondeliveryindication(
                    s1ap_xer__print2sp, message_string, message);
        }
        break;

        default: 
        {
            d_error("Unknown procedure ID (%d) for initiating message", 
                    (int)initiating_p->procedureCode);
            d_assert(0, return -1, 
                    "Unknown procedure ID (%d) for initiating message", 
                    (int)initiating_p->procedureCode);
        }
        break;
    }

    printf("%s\n", message_string);
    free_wrapper (message_string);
    return ret;
}

static int s1ap_decode_successfull_outcome(s1ap_message *message,
    S1ap_SuccessfulOutcome_t *successfullOutcome_p) 
{
    int ret = -1;
    char *message_string = NULL;

    d_assert(successfullOutcome_p, return -1, "Null param");
    message_string = calloc (10000, sizeof (char));
    s1ap_string_total_size = 0;

    switch (successfullOutcome_p->procedureCode) 
    {
        case S1ap_ProcedureCode_id_InitialContextSetup: 
        {
            ret = s1ap_decode_s1ap_initialcontextsetupresponseies(
                    &message->msg.s1ap_InitialContextSetupResponseIEs, 
                    &successfullOutcome_p->value);
            s1ap_xer_print_s1ap_initialcontextsetupresponse(s1ap_xer__print2sp,
                    message_string, message);
        }
        break;

        case S1ap_ProcedureCode_id_UEContextRelease: 
        {
            ret = s1ap_decode_s1ap_uecontextreleasecomplete_ies(
                    &message->msg.s1ap_UEContextReleaseComplete_IEs, 
                    &successfullOutcome_p->value);
            s1ap_xer_print_s1ap_uecontextreleasecomplete(s1ap_xer__print2sp,
                    message_string, message);
        }
        break;

        default: 
            d_error("Unknown procedure ID (%ld) for successfull "
                    "outcome message", successfullOutcome_p->procedureCode);
            break;
    }

    printf("%s\n", message_string);
    free_wrapper (message_string);
    return ret;
}

static int s1ap_decode_unsuccessfull_outcome(s1ap_message *message,
  S1ap_UnsuccessfulOutcome_t *unSuccessfulOutcome_p) 
{
    int ret = -1;
    char *message_string = NULL;

    d_assert(unSuccessfulOutcome_p, return -1, "Null param");
    message_string = calloc (10000, sizeof (char));
    s1ap_string_total_size = 0;

    switch (unSuccessfulOutcome_p->procedureCode) 
    {
        case S1ap_ProcedureCode_id_InitialContextSetup: 
        {
            ret = s1ap_decode_s1ap_initialcontextsetupfailureies(
                    &message->msg.s1ap_InitialContextSetupFailureIEs, 
                    &unSuccessfulOutcome_p->value);
            s1ap_xer_print_s1ap_initialcontextsetupfailure(s1ap_xer__print2sp,
                    message_string, message);
        }
        break;

        default: 
        {
            d_error("Unknown procedure ID (%d) for "
                    "unsuccessfull outcome message", 
                    (int)unSuccessfulOutcome_p->procedureCode);
        }
        break;
    }

    printf("%s\n", message_string);
    free_wrapper (message_string);
    return ret;
}

int s1ap_decode_pdu(s1ap_message *message, pkbuf_t *pkb)
{
    S1AP_PDU_t pdu = {0};
    S1AP_PDU_t *pdu_p = &pdu;
    asn_dec_rval_t dec_ret = {0};

    d_assert(pkb, return -1, "Null param");
    d_assert(pkb->payload, return -1, "Null param");
    memset((void *)pdu_p, 0, sizeof(S1AP_PDU_t));
    dec_ret = aper_decode(NULL, &asn_DEF_S1AP_PDU, (void **)&pdu_p, 
            pkb->payload, pkb->len, 0, 0);

    if (dec_ret.code != RC_OK) 
    {
        d_error("Failed to decode PDU");
        return -1;
    }

    memset(message, 0, sizeof(s1ap_message));

    message->direction = pdu_p->present;
    switch (pdu_p->present) 
    {
        case S1AP_PDU_PR_initiatingMessage:
            return s1ap_decode_initiating(message, 
                    &pdu_p->choice.initiatingMessage);

        case S1AP_PDU_PR_successfulOutcome:
            return s1ap_decode_successfull_outcome(message, 
                    &pdu_p->choice.successfulOutcome);

        case S1AP_PDU_PR_unsuccessfulOutcome:
            return s1ap_decode_unsuccessfull_outcome(message, 
                    &pdu_p->choice.unsuccessfulOutcome);

        default:
            d_error("Unknown message outcome (%d) or not implemented", 
                    (int)pdu_p->present);
            break;
    }

    return -1;
}