1 /*****************************************************************************
3 # Copyright 2019 AT&T Intellectual Property *
4 # Copyright 2019 Nokia *
6 # Licensed under the Apache License, Version 2.0 (the "License"); *
7 # you may not use this file except in compliance with the License. *
8 # You may obtain a copy of the License at *
10 # http://www.apache.org/licenses/LICENSE-2.0 *
12 # Unless required by applicable law or agreed to in writing, software *
13 # distributed under the License is distributed on an "AS IS" BASIS, *
14 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
15 # See the License for the specific language governing permissions and *
16 # limitations under the License. *
18 ******************************************************************************/
28 #include "e2sim_defs.h"
29 #include "e2sim_sctp.hpp"
30 #include "e2ap_message_handler.hpp"
31 #include "encode_e2apv1.hpp"
37 void E2Sim::register_subscription_callback(long func_id, SubscriptionCallback cb) {
38 printf("%%%%about to register callback for subscription for func_id %d\n", func_id);
39 subscription_callbacks[func_id] = cb;
43 SubscriptionCallback E2Sim::get_subscription_callback(long func_id) {
44 printf("%%%%we are getting the subscription callback for func id %d\n", func_id);
45 SubscriptionCallback cb = subscription_callbacks[func_id];
50 void E2Sim::register_e2sm(long func_id, OCTET_STRING_t *ostr) {
53 //If we already have an entry for func_id
55 printf("%%%%about to register e2sm func desc for %d\n", func_id);
57 ran_functions_registered[func_id] = ostr;
62 void E2Sim::encode_and_send_sctp_data(E2AP_PDU_t* pdu)
67 data.len = e2ap_asn1c_encode_pdu(pdu, &buf);
68 memcpy(data.buffer, buf, min(data.len, MAX_SCTP_BUFFER));
70 sctp_send_data(client_fd, data);
74 void E2Sim::wait_for_sctp_data()
76 sctp_buffer_t recv_buf;
77 if(sctp_receive_data(client_fd, recv_buf) > 0)
79 LOG_I("[SCTP] Received new data of size %d", recv_buf.len);
80 e2ap_handle_sctp_data(client_fd, recv_buf, false, this);
85 int E2Sim::run_loop(int argc, char* argv[]){
87 printf("Start E2 Agent (E2 Simulator\n");
92 simfile.open("simulation.txt", ios::in);
94 if (simfile.is_open()) {
96 while (getline(simfile, line)) {
106 options_t ops = read_input_options(argc, argv);
108 printf("After reading input options\n");
110 //E2 Agent will automatically restart upon sctp disconnection
111 // int server_fd = sctp_start_server(ops.server_ip, ops.server_port);
113 client_fd = sctp_start_client(ops.server_ip, ops.server_port);
114 E2AP_PDU_t* pdu_setup = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
116 printf("After starting client\n");
117 printf("client_fd value is %d\n", client_fd);
119 std::vector<ran_func_info> all_funcs;
121 //Loop through RAN function definitions that are registered
123 for (std::pair<long, OCTET_STRING_t*> elem : ran_functions_registered) {
124 printf("looping through ran func\n");
125 ran_func_info next_func;
127 next_func.ranFunctionId = elem.first;
128 next_func.ranFunctionDesc = elem.second;
129 next_func.ranFunctionRev = (long)2;
130 all_funcs.push_back(next_func);
133 printf("about to call setup request encode\n");
135 generate_e2apv1_setup_request_parameterized(pdu_setup, all_funcs);
137 printf("After generating e2setup req\n");
139 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_setup);
141 printf("After XER Encoding\n");
143 auto buffer_size = MAX_SCTP_BUFFER;
144 unsigned char buffer[MAX_SCTP_BUFFER];
148 char *error_buf = (char*)calloc(300, sizeof(char));
151 asn_check_constraints(&asn_DEF_E2AP_PDU, pdu_setup, error_buf, &errlen);
152 printf("error length %d\n", errlen);
153 printf("error buf %s\n", error_buf);
155 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_setup, buffer, buffer_size);
157 data.len = er.encoded;
159 fprintf(stderr, "er encded is %d\n", er.encoded);
161 memcpy(data.buffer, buffer, er.encoded);
163 if(sctp_send_data(client_fd, data) > 0) {
164 LOG_I("[SCTP] Sent E2-SETUP-REQUEST");
166 LOG_E("[SCTP] Unable to send E2-SETUP-REQUEST to peer");
169 sctp_buffer_t recv_buf;
171 LOG_I("[SCTP] Waiting for SCTP data");
173 while(1) //constantly looking for data on SCTP interface
175 if(sctp_receive_data(client_fd, recv_buf) <= 0)
178 LOG_I("[SCTP] Received new data of size %d", recv_buf.len);
180 e2ap_handle_sctp_data(client_fd, recv_buf, xmlenc, this);
181 if (xmlenc) xmlenc = false;