3 /*****************************************************************************
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5 # Copyright 2020 AT&T Intellectual Property *
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6 # Copyright (c) 2020 Samsung Electronics Co., Ltd. All Rights Reserved. *
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8 # Licensed under the Apache License, Version 2.0 (the "License"); *
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9 # you may not use this file except in compliance with the License. *
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10 # You may obtain a copy of the License at *
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12 # http://www.apache.org/licenses/LICENSE-2.0 *
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14 # Unless required by applicable law or agreed to in writing, software *
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15 # distributed under the License is distributed on an "AS IS" BASIS, *
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16 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
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17 # See the License for the specific language governing permissions and *
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18 # limitations under the License. *
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20 ******************************************************************************/
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21 #include "e2ap_message_handler.hpp"
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23 //#include <iostream>
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28 #include "encode_e2apv1.hpp"
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30 void e2ap_handle_sctp_data(int& socket_fd, sctp_buffer_t& data, bool xmlenc, E2Sim* e2sim) {
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31 E2AP_PDU_t* pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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32 ASN_STRUCT_RESET(asn_DEF_E2AP_PDU, pdu);
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34 asn_transfer_syntax syntax;
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36 syntax = ATS_ALIGNED_BASIC_PER;
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37 auto rval = asn_decode(nullptr, syntax, &asn_DEF_E2AP_PDU, (void**)&pdu, data.buffer, data.len);
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39 switch (rval.code) {
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43 LOG_E("Failed to decode E2AP data from SCTP connection");
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44 ASN_STRUCT_FREE(asn_DEF_E2AP_PDU, pdu);
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48 int procedureCode = e2ap_asn1c_get_procedureCode(pdu);
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49 int index = (int)pdu->present;
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51 LOG_D("Unpacked E2AP-PDU: index = %d, procedureCode = %d\n", index, procedureCode);
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53 switch (procedureCode) {
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54 case ProcedureCode_id_E2setup:
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55 LOG_I("Received a message of E2 setup procedure");
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57 case E2AP_PDU_PR_initiatingMessage:
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58 e2ap_handle_E2SetupRequest(pdu, socket_fd);
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59 LOG_I("Received SETUP-REQUEST");
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62 case E2AP_PDU_PR_successfulOutcome:
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63 LOG_I("Received SETUP-RESPONSE-SUCCESS");
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66 case E2AP_PDU_PR_unsuccessfulOutcome:
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67 LOG_I("Received SETUP-RESPONSE-FAILURE");
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71 LOG_E("Invalid message index=%d in E2AP-PDU", index);
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76 case ProcedureCode_id_Reset: // reset = 7
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77 LOG_I("Received a message of Reset procedure");
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79 case E2AP_PDU_PR_initiatingMessage:
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80 LOG_I("Received RESET-REQUEST");
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83 case E2AP_PDU_PR_successfulOutcome:
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86 case E2AP_PDU_PR_unsuccessfulOutcome:
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90 LOG_E("Invalid message index=%d in E2AP-PDU", index);
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95 case ProcedureCode_id_RICsubscription: // RIC SUBSCRIPTION = 201
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96 LOG_I("Received a message of RIC subscription procedure");
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98 case E2AP_PDU_PR_initiatingMessage: { // initiatingMessage
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99 LOG_I("Received RIC-SUBSCRIPTION-REQUEST");
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100 // e2ap_handle_RICSubscriptionRequest(pdu, socket_fd);
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101 long func_id = encoding::get_function_id_from_subscription(pdu);
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102 fprintf(stderr, "Function Id of message is %d\n", func_id);
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103 SubscriptionCallback cb;
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105 bool func_exists = true;
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108 cb = e2sim->get_subscription_callback(func_id);
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109 } catch (const std::out_of_range& e) {
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110 func_exists = false;
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114 fprintf(stderr, "Calling callback function\n");
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117 fprintf(stderr, "Error: No RAN Function with this ID exists\n");
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119 // callback_kpm_subscription_request(pdu, socket_fd);
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123 case E2AP_PDU_PR_successfulOutcome:
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124 LOG_I("Received RIC-SUBSCRIPTION-RESPONSE");
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127 case E2AP_PDU_PR_unsuccessfulOutcome:
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128 LOG_I("Received RIC-SUBSCRIPTION-FAILURE");
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132 LOG_E("Invalid message index=%d in E2AP-PDU", index);
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137 case ProcedureCode_id_RICindication: // 205
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138 LOG_I("Received a message of RIC indication procedure");
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140 case E2AP_PDU_PR_initiatingMessage: // initiatingMessage
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141 LOG_I("Received RIC-INDICATION-REQUEST");
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142 // e2ap_handle_RICSubscriptionRequest(pdu, socket_fd);
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144 case E2AP_PDU_PR_successfulOutcome:
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145 LOG_I("Received RIC-INDICATION-RESPONSE");
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148 case E2AP_PDU_PR_unsuccessfulOutcome:
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149 LOG_I("Received RIC-INDICATION-FAILURE");
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153 LOG_E("Invalid message index=%d in E2AP-PDU %d", index, (int)ProcedureCode_id_RICindication);
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158 case ProcedureCode_id_RICserviceQuery:
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159 LOG_I("Received a message of RIC service query procedure");
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161 case E2AP_PDU_PR_initiatingMessage:
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162 LOG_I("Received RIC-Service-Query")
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163 e2ap_handle_E2SeviceRequest(pdu, socket_fd, e2sim);
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167 LOG_E("Invalid message index=%d in E2AP-PDU %d", index, (int)ProcedureCode_id_RICserviceQuery);
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172 case ProcedureCode_id_E2nodeConfigurationUpdate:
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173 LOG_I("Received a message of E2 node configuration update procedure");
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175 case E2AP_PDU_PR_successfulOutcome:
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176 LOG_I("Received E2nodeConfigurationUpdate")
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180 LOG_E("Invalid message index=%d in E2AP-PDU %d", index, (int)ProcedureCode_id_E2nodeConfigurationUpdate);
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185 case ProcedureCode_id_RICserviceUpdate:
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186 LOG_I("Received a message of RIC service update procedure");
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188 case E2AP_PDU_PR_successfulOutcome:
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189 LOG_I("Received RIC-SERVICE-UPDATE-SUCCESS")
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192 case E2AP_PDU_PR_unsuccessfulOutcome:
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193 LOG_I("Received RIC-SERVICE-UPDATE-FAILURE")
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197 LOG_E("Invalid message index=%d in E2AP-PDU %d", index, (int)ProcedureCode_id_RICserviceUpdate);
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203 LOG_E("No available handler for procedureCode=%d", procedureCode);
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206 ASN_STRUCT_FREE(asn_DEF_E2AP_PDU, pdu);
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209 void e2ap_handle_E2SeviceRequest(E2AP_PDU_t* pdu, int& socket_fd, E2Sim* e2sim) {
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210 auto buffer_size = MAX_SCTP_BUFFER;
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211 unsigned char buffer[MAX_SCTP_BUFFER];
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212 E2AP_PDU_t* res_pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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214 // prepare ran function defination
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215 std::vector<encoding::ran_func_info> all_funcs;
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217 // Loop through RAN function definitions that are registered
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219 for (std::pair<long, OCTET_STRING_t*> elem : e2sim->getRegistered_ran_functions()) {
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220 printf("looping through ran func\n");
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221 encoding::ran_func_info next_func;
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223 next_func.ranFunctionId = elem.first;
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224 next_func.ranFunctionDesc = elem.second;
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225 next_func.ranFunctionRev = (long)3;
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226 all_funcs.push_back(next_func);
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229 printf("about to call service update encode\n");
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231 encoding::generate_e2apv1_service_update(res_pdu, all_funcs);
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233 LOG_D("Created E2-SERVICE-UPDATE");
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235 e2ap_asn1c_print_pdu(res_pdu);
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237 sctp_buffer_t data;
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239 char error_buf[300] = {
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244 asn_check_constraints(&asn_DEF_E2AP_PDU, res_pdu, error_buf, &errlen);
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245 printf("error length %d\n", errlen);
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246 printf("error buf %s\n", error_buf);
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248 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, res_pdu, buffer, buffer_size);
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250 if (er.encoded == -1) {
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251 LOG_E("Failed to serialize message. Detail: %s.\n", asn_DEF_E2AP_PDU.name);
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253 } else if (er.encoded > buffer_size) {
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254 LOG_E("Buffer of size %zu is too small for %s, need %zu\n", buffer_size, asn_DEF_E2AP_PDU.name, er.encoded);
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258 data.len = er.encoded;
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260 memcpy(data.buffer, buffer, er.encoded);
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262 // send response data over sctp
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263 if (sctp_send_data(socket_fd, data) > 0) {
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264 LOG_I("Sent E2-SERVICE-UPDATE");
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266 LOG_E("Unable to send E2-SERVICE-UPDATE to peer");
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270 void e2ap_send_e2nodeConfigUpdate(int& socket_fd) {
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271 auto buffer_size = MAX_SCTP_BUFFER;
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272 unsigned char buffer[MAX_SCTP_BUFFER];
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273 E2AP_PDU_t* pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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275 LOG_I("Generating E2 node configure update");
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277 encoding::generate_e2apv2_config_update(pdu);
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279 e2ap_asn1c_print_pdu(pdu);
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281 sctp_buffer_t data;
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283 char error_buf[300] = {
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288 asn_check_constraints(&asn_DEF_E2AP_PDU, pdu, error_buf, &errlen);
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290 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu, buffer, buffer_size);
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292 if (er.encoded == -1) {
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293 LOG_E("Failed to serialize message. Detail: %s.\n", asn_DEF_E2AP_PDU.name);
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295 } else if (er.encoded > buffer_size) {
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296 LOG_E("Buffer of size %zu is too small for %s, need %zu\n", buffer_size, asn_DEF_E2AP_PDU.name, er.encoded);
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300 data.len = er.encoded;
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302 memcpy(data.buffer, buffer, er.encoded);
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304 // send response data over sctp
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305 if (sctp_send_data(socket_fd, data) > 0) {
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306 LOG_I("Sent E2nodeConfigUpdate");
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308 LOG_E("[SCTP] Unable to send E2nodeConfigUpdate to peer");
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312 void e2ap_handle_E2SetupRequest(E2AP_PDU_t* pdu, int& socket_fd) {
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313 E2AP_PDU_t* res_pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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314 encoding::generate_e2apv1_setup_response(res_pdu);
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316 LOG_D("Created E2-SETUP-RESPONSE");
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318 e2ap_asn1c_print_pdu(res_pdu);
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320 auto buffer_size = MAX_SCTP_BUFFER;
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321 unsigned char buffer[MAX_SCTP_BUFFER];
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323 sctp_buffer_t data;
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324 auto er = asn_encode_to_buffer(nullptr, ATS_BASIC_XER, &asn_DEF_E2AP_PDU, res_pdu, buffer, buffer_size);
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326 if (er.encoded == -1) {
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327 LOG_E("Failed to serialize message. Detail: %s.\n", asn_DEF_E2AP_PDU.name);
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329 } else if (er.encoded > buffer_size) {
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330 LOG_E("Buffer of size %zu is too small for %s, need %zu\n", buffer_size, asn_DEF_E2AP_PDU.name, er.encoded);
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334 data.len = er.encoded;
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336 memcpy(data.buffer, buffer, er.encoded);
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338 // send response data over sctp
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339 if (sctp_send_data(socket_fd, data) > 0) {
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340 LOG_I("Sent E2-SETUP-RESPONSE");
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342 LOG_E("[SCTP] Unable to send E2-SETUP-RESPONSE to peer");
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347 // Sending Subscription Request
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349 E2AP_PDU_t* pdu_sub = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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351 encoding::generate_e2apv1_subscription_request(pdu_sub);
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353 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_sub);
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355 auto buffer_size2 = MAX_SCTP_BUFFER;
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356 unsigned char buffer2[MAX_SCTP_BUFFER];
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358 sctp_buffer_t data2;
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360 auto er2 = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_sub, buffer2, buffer_size2);
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362 if (er2.encoded == -1) {
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363 LOG_E("Failed to serialize message. Detail: %s.\n", asn_DEF_E2AP_PDU.name);
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365 } else if (er2.encoded > buffer_size2) {
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366 LOG_E("Buffer of size %zu is too small for %s, need %zu\n", buffer_size2, asn_DEF_E2AP_PDU.name, er2.encoded);
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370 data2.len = er2.encoded;
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371 memcpy(data2.buffer, buffer2, er2.encoded);
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373 if (sctp_send_data(socket_fd, data2) > 0) {
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374 LOG_I("Sent E2-SUBSCRIPTION-REQUEST");
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376 LOG_E("[SCTP] Unable to send E2-SUBSCRIPTION-REQUEST to peer");
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381 void e2ap_handle_RICSubscriptionRequest(E2AP_PDU_t* pdu, int &socket_fd)
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384 //Send back Subscription Success Response
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386 E2AP_PDU_t* pdu_resp = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
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388 generate_e2apv1_subscription_response(pdu_resp, pdu);
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390 fprintf(stderr, "Subscription Response\n");
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392 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_resp);
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394 auto buffer_size2 = MAX_SCTP_BUFFER;
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395 unsigned char buffer2[MAX_SCTP_BUFFER];
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397 sctp_buffer_t data2;
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399 auto er2 = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_resp, buffer2, buffer_size2);
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400 data2.len = er2.encoded;
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402 fprintf(stderr, "er encded is %d\n", er2.encoded);
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404 memcpy(data2.buffer, buffer2, er2.encoded);
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406 if(sctp_send_data(socket_fd, data2) > 0) {
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407 LOG_I("Sent RIC-SUBSCRIPTION-RESPONSE");
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409 LOG_E("[SCTP] Unable to send RIC-SUBSCRIPTION-RESPONSE to peer");
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413 //Send back an Indication
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415 E2AP_PDU_t* pdu_ind = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
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417 generate_e2apv1_indication_request(pdu_ind);
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419 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_ind);
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421 auto buffer_size = MAX_SCTP_BUFFER;
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422 unsigned char buffer[MAX_SCTP_BUFFER];
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424 sctp_buffer_t data;
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426 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_ind, buffer, buffer_size);
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427 data.len = er.encoded;
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429 fprintf(stderr, "er encded is %d\n", er.encoded);
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431 memcpy(data.buffer, buffer, er.encoded);
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433 if(sctp_send_data(socket_fd, data) > 0) {
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434 LOG_I("Sent RIC-INDICATION-REQUEST");
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436 LOG_E("[SCTP] Unable to send RIC-INDICATION-REQUEST to peer");
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