--- /dev/null
+/*****************************************************************************
+# *
+# Copyright 2020 AT&T Intellectual Property *
+# Copyright 2020 Nokia *
+# *
+# Licensed under the Apache License, Version 2.0 (the "License"); *
+# you may not use this file except in compliance with the License. *
+# You may obtain a copy of the License at *
+# *
+# http://www.apache.org/licenses/LICENSE-2.0 *
+# *
+# Unless required by applicable law or agreed to in writing, software *
+# distributed under the License is distributed on an "AS IS" BASIS, *
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
+# See the License for the specific language governing permissions and *
+# limitations under the License. *
+# *
+******************************************************************************/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string>
+#include <iostream>
+#include <vector>
+#include <thread>
+#include "./wg_defs.h"
+#include "e2sim_sctp.hpp"
+#include "e2ap_message_handler.hpp"
+
+extern "C" {
+#include "E2AP-PDU.h"
+#include "e2ap_asn1c_codec.h"
+#include "ProtocolIE-Field.h"
+}
+
+
+using namespace std;
+
+int keep_looping;
+struct timespec* start_ts = (struct timespec*)malloc(sizeof(struct timespec));
+vector<struct timespec*> msg_ts = vector<struct timespec*>(NUM_SAMPLE, NULL);
+vector<float> latency_v = vector<float>(NUM_SAMPLE, 0.0);
+
+int subresponse_get_sequenceNum(E2AP_PDU_t* pdu) {
+ SuccessfulOutcome_t* responseMsg = pdu->choice.successfulOutcome;
+ RICrequestID_t* requestid;
+ int num_IEs = responseMsg->value.choice.RICsubscriptionResponse.protocolIEs.\
+ list.count;
+
+ for (int edx = 0; edx < num_IEs; edx++) {
+ RICsubscriptionResponse_IEs_t* memb_ptr =
+ responseMsg->value.choice.RICsubscriptionResponse.protocolIEs.list.\
+ array[edx];
+ switch (memb_ptr->id) {
+ case (ProtocolIE_ID_id_RICrequestID):
+ requestid = &memb_ptr->value.choice.RICrequestID;
+ return requestid->ricRequestSequenceNumber;
+ break;
+ }
+ }
+}
+
+void subrequest_set_sequenceNum(E2AP_PDU_t* pdu, int seq) {
+ InitiatingMessage_t* initiatingMessage = pdu->choice.initiatingMessage;
+ RICrequestID_t* requestid;
+ int num_IEs = initiatingMessage->value.choice.RICsubscriptionRequest.\
+ protocolIEs.list.count;
+ for (int edx = 0; edx < num_IEs; edx++) {
+ RICsubscriptionRequest_IEs_t* memb_ptr = initiatingMessage->value.choice.\
+ RICsubscriptionRequest.protocolIEs.list.array[edx];
+ switch (memb_ptr->id) {
+ case (ProtocolIE_ID_id_RICrequestID):
+ requestid = &memb_ptr->value.choice.RICrequestID;
+ requestid->ricRequestSequenceNumber = seq;
+ break;
+ }
+ }
+}
+
+int wg_setup(int socket_fd) {
+ sctp_buffer_t recv_buf;
+ // stage 1: Receive ENDC_X2_Setup Request; Send ENDC_X2_Setup Response
+ while (sctp_receive_data(socket_fd, recv_buf) <= 0)
+ continue;
+ // decode the data into E2AP-PDU
+ E2AP_PDU_t* pdu = new E2AP_PDU_t();
+ e2ap_asn1c_decode_pdu(pdu, recv_buf.buffer, recv_buf.len);
+ int procedureCode = e2ap_asn1c_get_procedureCode(pdu);
+ int index = static_cast<int>(pdu->present);
+ e2ap_handle_ENDCX2SetupRequest(pdu, socket_fd);
+ // stage 2: send a response wait for request,if not keep sending
+ while (1) {
+ E2AP_PDU_t* res_pdu = e2ap_xml_to_pdu("E2AP_RICsubscriptionResponse.xml");
+ uint8_t* buf;
+ sctp_buffer_t data;
+ data.len = e2ap_asn1c_encode_pdu(res_pdu, &buf);
+ memcpy(data.buffer, buf, data.len);
+ if (sctp_send_data(socket_fd, data) > 0) {
+ LOG_I("[WG] Sent RIC-SUBSCRIPTION-RESPONSE");
+ } else {
+ LOG_E("[WG] Unable to send RIC-SUBSCRIPTION-RESPONSE to peer");
+ }
+ while (sctp_receive_data(socket_fd, recv_buf) <= 0)
+ continue;
+ e2ap_asn1c_decode_pdu(pdu, recv_buf.buffer, recv_buf.len);
+ // e2ap_asn1c_print_pdu(pdu);
+ procedureCode = e2ap_asn1c_get_procedureCode(pdu);
+ index = static_cast<int>(pdu->present);
+ if (procedureCode == ProcedureCode_id_ricSubscription && \
+ index == E2AP_PDU_PR_initiatingMessage) {
+ LOG_I("[WG] Received RIC-SUBSCRIPTION-REQUEST");
+ return 0;
+ }
+ }
+ return -1;
+}
+
+int wg_receiver(int client_fd) {
+ int count_msg_recved = 0;
+ sctp_buffer_t recv_buf;
+ // stage 1: Receive ENDC_X2_Setup Request; Send ENDC_X2_Setup Response
+ while (sctp_receive_data(client_fd, recv_buf) <= 0)
+ continue;
+ count_msg_recved++;
+ // decode the data into E2AP-PDU
+ E2AP_PDU_t* pdu = new E2AP_PDU_t();
+ e2ap_asn1c_decode_pdu(pdu, recv_buf.buffer, recv_buf.len);
+ int seq_n = subresponse_get_sequenceNum(pdu);
+ int index = seq_n % keep_looping;
+ if (index == 0) {
+ char fname[256];
+ snprintf(fname, sizeof fname, "cdf.csv");
+ FILE *fptr = fopen(fname, "w");
+ for (int i = 0; i < latency_v.size(); i++)
+ fprintf(fptr, "%d %f\n", i, latency_v[i]);
+ fclose(fptr);
+ }
+ if (msg_ts[index] != NULL && index < msg_ts.size()) {
+ struct timespec* ts = (struct timespec*)malloc(sizeof(struct timespec));
+ clock_gettime(CLOCK_REALTIME, ts);
+ uint64_t elapse = (ts->tv_sec - msg_ts[index]->tv_sec) * 1000000000 + \
+ ts->tv_nsec - msg_ts[index]->tv_nsec;
+ double ms_elapse = static_cast<double>(elapse) / 1000000;
+ uint64_t total_elapse = (ts->tv_sec - start_ts->tv_sec) * 1000000000 + \
+ ts->tv_nsec - start_ts->tv_nsec;
+ double total_ms_elapse = static_cast<double>(total_elapse / 1000000);
+ latency_v[index] = ms_elapse;
+ cout << '\r' << ms_elapse << "ms " << count_msg_recved * 1000.0 / \
+ total_ms_elapse << "msgs/second" << flush;
+ }
+}
+
+int wg_generator(int client_fd, int lapse) {
+ int count = 0;
+ clock_gettime(CLOCK_REALTIME, start_ts);
+ while (1) {
+ if (count > NUM_SAMPLE) {
+ count = 0;
+ clock_gettime(CLOCK_REALTIME, start_ts);
+ }
+ E2AP_PDU_t* res_pdu = e2ap_xml_to_pdu("E2AP_RICsubscriptionResponse.xml");
+ subrequest_set_sequenceNum(res_pdu, count);
+ uint8_t* buf;
+ sctp_buffer_t data;
+ data.len = e2ap_asn1c_encode_pdu(res_pdu, &buf);
+ memcpy(data.buffer, buf, data.len);
+ // send response data over sctp
+ usleep(lapse);
+ if (sctp_send_data(client_fd, data) > 0) {
+ int index = count % keep_looping;
+ struct timespec* ts_p = (struct timespec*)malloc(sizeof(struct timespec));
+ clock_gettime(CLOCK_REALTIME, ts_p);
+ msg_ts[index] = ts_p;
+ } else {
+ LOG_E("[WG] Unable to send RIC-SUBSCRIPTION-RESPONSE to peer");
+ return -1;
+ }
+ count++;
+ wg_receiver(client_fd);
+ }
+ cout << endl;
+ return 0;
+}
+
+int main(int argc, char* argv[]) {
+ LOG_I("Start WG");
+ wg_options_t ops = wg_input_options(argc, argv);
+ int server_fd = sctp_start_server(ops.server_ip, ops.server_port);
+ int client_fd = sctp_accept_connection(ops.server_ip, server_fd);
+ keep_looping = NUM_SAMPLE;
+ LOG_I("[SCTP] Waiting for SCTP data");
+ uint64_t count = 0;
+ int lapse = static_cast<int>((1.0/static_cast<double>(ops.rate)) * SEC2MUS);
+ wg_setup(client_fd);
+ wg_generator(client_fd, lapse);
+}
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