1 /*****************************************************************************
3 # Copyright 2020 AT&T Intellectual Property *
5 # Licensed under the Apache License, Version 2.0 (the "License"); *
6 # you may not use this file except in compliance with the License. *
7 # You may obtain a copy of the License at *
9 # http://www.apache.org/licenses/LICENSE-2.0 *
11 # Unless required by applicable law or agreed to in writing, software *
12 # distributed under the License is distributed on an "AS IS" BASIS, *
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
14 # See the License for the specific language governing permissions and *
15 # limitations under the License. *
17 ******************************************************************************/
27 #include "e2sim_defs.h"
28 #include "e2sim_sctp.hpp"
29 #include "e2ap_message_handler.hpp"
30 #include "encode_e2apv1.hpp"
36 void E2Sim::register_subscription_callback(long func_id, SubscriptionCallback cb) {
37 fprintf(stderr,"%%%%about to register callback for subscription for func_id %d\n", func_id);
38 subscription_callbacks[func_id] = cb;
42 SubscriptionCallback E2Sim::get_subscription_callback(long func_id) {
43 fprintf(stderr, "%%%%we are getting the subscription callback for func id %d\n", func_id);
44 SubscriptionCallback cb;
47 cb = subscription_callbacks.at(func_id);
48 } catch(const std::out_of_range& e) {
49 throw std::out_of_range("Function ID is not registered");
55 void E2Sim::register_e2sm(long func_id, OCTET_STRING_t *ostr) {
58 //If we already have an entry for func_id
60 printf("%%%%about to register e2sm func desc for %d\n", func_id);
62 ran_functions_registered[func_id] = ostr;
67 void E2Sim::encode_and_send_sctp_data(E2AP_PDU_t* pdu)
72 data.len = e2ap_asn1c_encode_pdu(pdu, &buf);
73 memcpy(data.buffer, buf, min(data.len, MAX_SCTP_BUFFER));
75 sctp_send_data(client_fd, data);
79 void E2Sim::wait_for_sctp_data()
81 sctp_buffer_t recv_buf;
82 if(sctp_receive_data(client_fd, recv_buf) > 0)
84 LOG_I("[SCTP] Received new data of size %d", recv_buf.len);
85 e2ap_handle_sctp_data(client_fd, recv_buf, false, this);
91 void E2Sim::generate_e2apv1_subscription_response_success(E2AP_PDU *e2ap_pdu, long reqActionIdsAccepted[], long reqActionIdsRejected[], int accept_size, int reject_size, long reqRequestorId, long reqInstanceId) {
92 encoding::generate_e2apv1_subscription_response_success(e2ap_pdu, reqActionIdsAccepted, reqActionIdsRejected, accept_size, reject_size, reqRequestorId, reqInstanceId);
95 void E2Sim::generate_e2apv1_indication_request_parameterized(E2AP_PDU *e2ap_pdu, long requestorId, long instanceId, long ranFunctionId, long actionId, long seqNum, uint8_t *ind_header_buf, int header_length, uint8_t *ind_message_buf, int message_length) {
96 encoding::generate_e2apv1_indication_request_parameterized(e2ap_pdu, requestorId, instanceId, ranFunctionId, actionId, seqNum, ind_header_buf, header_length, ind_message_buf, message_length);
100 int E2Sim::run_loop(int argc, char* argv[]){
102 printf("Start E2 Agent (E2 Simulator\n");
107 simfile.open("simulation.txt", ios::in);
109 if (simfile.is_open()) {
111 while (getline(simfile, line)) {
112 cout << line << "\n";
121 options_t ops = read_input_options(argc, argv);
123 printf("After reading input options\n");
125 //E2 Agent will automatically restart upon sctp disconnection
126 // int server_fd = sctp_start_server(ops.server_ip, ops.server_port);
128 client_fd = sctp_start_client(ops.server_ip, ops.server_port);
129 E2AP_PDU_t* pdu_setup = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
131 printf("After starting client\n");
132 printf("client_fd value is %d\n", client_fd);
134 std::vector<encoding::ran_func_info> all_funcs;
136 //Loop through RAN function definitions that are registered
138 for (std::pair<long, OCTET_STRING_t*> elem : ran_functions_registered) {
139 printf("looping through ran func\n");
140 encoding::ran_func_info next_func;
142 next_func.ranFunctionId = elem.first;
143 next_func.ranFunctionDesc = elem.second;
144 next_func.ranFunctionRev = (long)2;
145 all_funcs.push_back(next_func);
148 printf("about to call setup request encode\n");
150 generate_e2apv1_setup_request_parameterized(pdu_setup, all_funcs);
152 printf("After generating e2setup req\n");
154 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_setup);
156 printf("After XER Encoding\n");
158 auto buffer_size = MAX_SCTP_BUFFER;
159 unsigned char buffer[MAX_SCTP_BUFFER];
163 char *error_buf = (char*)calloc(300, sizeof(char));
166 asn_check_constraints(&asn_DEF_E2AP_PDU, pdu_setup, error_buf, &errlen);
167 printf("error length %d\n", errlen);
168 printf("error buf %s\n", error_buf);
170 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_setup, buffer, buffer_size);
172 data.len = er.encoded;
174 fprintf(stderr, "er encded is %d\n", er.encoded);
176 memcpy(data.buffer, buffer, er.encoded);
178 if(sctp_send_data(client_fd, data) > 0) {
179 LOG_I("[SCTP] Sent E2-SETUP-REQUEST");
181 LOG_E("[SCTP] Unable to send E2-SETUP-REQUEST to peer");
184 sctp_buffer_t recv_buf;
186 LOG_I("[SCTP] Waiting for SCTP data");
188 while(1) //constantly looking for data on SCTP interface
190 if(sctp_receive_data(client_fd, recv_buf) <= 0)
193 LOG_I("[SCTP] Received new data of size %d", recv_buf.len);
195 e2ap_handle_sctp_data(client_fd, recv_buf, xmlenc, this);
196 if (xmlenc) xmlenc = false;