FreeCalypso > hg > themwi-system-sw

annotate sip-in/cancel.c @ 167:2ebad02adbe5

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themwi-mncc: route outbound calls to themwi-sip-out
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 12 Oct 2022 18:08:34 -0800
parents 9b87894704eb
children
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79
b0df2b200d77 sip-in: implement SIP CANCEL
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * Here we implement our handling of SIP CANCEL method.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/socket.h>
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9b87894704eb sip-in: first step toward final call clearing
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7 #include <sys/time.h>
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b0df2b200d77 sip-in: implement SIP CANCEL
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8 #include <netinet/in.h>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <syslog.h>
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15 #include "../include/gsm48_const.h"
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16 #include "../libsip/parse.h"
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17 #include "../libsip/uas_basic.h"
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18 #include "../libsip/out_msg.h"
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19 #include "call.h"
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20
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21 extern struct call *find_call_by_sip_id();
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22
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23 static void
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24 cancel_200_response(req, ess, sin, call)
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25 struct sip_pkt_rx *req;
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26 struct uas_parse_hdrs *ess;
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27 struct sockaddr_in *sin;
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28 struct call *call;
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29 {
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30 struct sip_msg_out resp;
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31 char cseq_str[32];
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32 int rc;
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33
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34 start_response_out_msg(&resp, "200 OK");
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35 rc = out_msg_add_header(&resp, "From", call->invite_from);
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36 if (rc < 0) {
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37 msg_size_err: syslog(LOG_ERR, "CANCEL 200 response length exceeded");
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38 return;
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39 }
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40 rc = out_msg_add_header(&resp, "To", call->invite_to);
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41 if (rc < 0)
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42 goto msg_size_err;
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43 rc = out_msg_add_header(&resp, "Call-ID", call->sip_call_id);
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44 if (rc < 0)
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45 goto msg_size_err;
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46 sprintf(cseq_str, "%u CANCEL", call->invite_cseq);
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47 rc = out_msg_add_header(&resp, "CSeq", cseq_str);
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48 if (rc < 0)
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49 goto msg_size_err;
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50 rc = out_msg_add_header(&resp, "Via", ess->via);
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51 if (rc < 0)
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52 goto msg_size_err;
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53 out_msg_finish(&resp);
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54 sip_tx_packet(&resp, sin);
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55 }
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56
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57 static void
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58 cancel_481_response(req, ess, sin)
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59 struct sip_pkt_rx *req;
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60 struct uas_parse_hdrs *ess;
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61 struct sockaddr_in *sin;
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62 {
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63 struct sip_msg_out resp;
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64 int rc;
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65
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66 start_response_out_msg(&resp, "481 Call-ID/CSeq not found");
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67 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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68 if (rc < 0)
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69 return;
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70 out_msg_finish(&resp);
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71 sip_tx_packet(&resp, sin);
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72 }
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73
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74 void
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75 handle_sip_cancel(req, ess, sin)
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76 struct sip_pkt_rx *req;
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77 struct uas_parse_hdrs *ess;
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78 struct sockaddr_in *sin;
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79 {
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80 struct call *call;
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81
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82 call = find_call_by_sip_id(ess->call_id);
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83 if (!call) {
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84 cancel_481_response(req, ess, sin);
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85 return;
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86 }
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87 /* weed out wrong CSeq */
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88 if (ess->cseq_num != call->invite_cseq) {
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89 cancel_481_response(req, ess, sin);
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90 return;
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91 }
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92 /* it is for us - act on it */
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93 switch (call->sip_state) {
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94 case SIP_STATE_INVITE_PROC:
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95 case SIP_STATE_RINGING:
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96 case SIP_STATE_RINGING_REL:
79
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97 call->overall_state = OVERALL_STATE_TEARDOWN;
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98 disconnect_mncc(call, GSM48_CAUSE_LOC_NET_BEYOND,
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99 GSM48_CC_CAUSE_NORM_CALL_CLEAR);
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100 disconnect_tmgw(call);
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101 strcpy(call->invite_fail, "487 Call attempt terminated");
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102 signal_invite_error(call);
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103 break;
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104 case SIP_STATE_MSG_SIZE_ERR:
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105 return;
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106 }
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107 cancel_200_response(req, ess, sin, call);
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108 }