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annotate sip-in/retrans.c @ 109:9b87894704eb

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sip-in: first step toward final call clearing
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Sep 2022 16:32:13 -0800
parents 0d6435808bcd
children c1c94b7fc2e2
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1 /*
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2 * In this module we handle retransmission of INVITE responses
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3 * and BYE requests.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <sys/time.h>
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9 #include <netinet/in.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15 #include <syslog.h>
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16 #include "../include/gsm48_const.h"
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17 #include "../libsip/out_msg.h"
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18 #include "call.h"
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19
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20 extern unsigned cfg_retrans_count;
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21 extern unsigned sip_linger_error;
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22 extern struct call *call_list;
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23
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24 void
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25 run_periodic_retrans()
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26 {
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27 struct call *call;
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28 struct sip_msg_out msg;
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29
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30 for (call = call_list; call; call = call->next) {
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31 switch (call->sip_state) {
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32 case SIP_STATE_RINGING_REL:
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33 if (call->sip_tx_count < cfg_retrans_count) {
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34 start_response_out_msg(&msg, "180 Ringing");
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35 fill_invite_resp_from_call(&msg, call);
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36 out_msg_add_header(&msg, "Require", "100rel");
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37 out_msg_add_header(&msg, "RSeq", "1");
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38 out_msg_finish(&msg);
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39 sip_tx_packet(&msg, &call->udp_sin);
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40 call->sip_tx_count++;
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41 } else {
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42 call->overall_state = OVERALL_STATE_TEARDOWN;
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43 disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU,
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44 GSM48_CC_CAUSE_INTERWORKING);
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45 disconnect_tmgw(call);
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46 strcpy(call->invite_fail,
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47 "504 100rel retransmissions exhausted");
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48 signal_invite_error(call);
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49 }
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50 break;
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51 case SIP_STATE_INVITE_200:
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52 if (call->sip_tx_count < cfg_retrans_count) {
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53 fill_invite_200_resp(&msg, call);
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54 sip_tx_packet(&msg, &call->udp_sin);
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55 call->sip_tx_count++;
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56 } else {
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57 call->overall_state = OVERALL_STATE_TEARDOWN;
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58 disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU,
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59 GSM48_CC_CAUSE_INTERWORKING);
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60 disconnect_tmgw(call);
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61 initiate_bye(call);
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62 }
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63 break;
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64 case SIP_STATE_INVITE_ERR:
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65 if (call->sip_tx_count < cfg_retrans_count) {
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66 start_response_out_msg(&msg, call->invite_fail);
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67 fill_invite_resp_from_call(&msg, call);
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68 out_msg_finish(&msg);
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69 sip_tx_packet(&msg, &call->udp_sin);
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70 call->sip_tx_count++;
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71 } else {
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72 call->sip_state = SIP_STATE_ENDED;
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73 sip_mark_end_time(call, sip_linger_error);
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74 }
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75 break;
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76 case SIP_STATE_BYE_SENT:
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77 if (call->sip_tx_count < cfg_retrans_count) {
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78 fill_bye_out_msg(&msg, call);
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79 sip_tx_packet(&msg, &call->udp_sin);
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80 call->sip_tx_count++;
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81 } else {
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82 call->sip_state = SIP_STATE_ENDED;
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83 sip_mark_end_time(call, sip_linger_error);
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84 }
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85 break;
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86 }
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87 }
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88 }