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annotate sip-in/cancel.c @ 79:b0df2b200d77

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sip-in: implement SIP CANCEL
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 20 Sep 2022 18:58:11 -0800
parents
children 0d6435808bcd
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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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Mychaela Falconia <falcon@freecalypso.org>
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2 * Here we implement our handling of SIP CANCEL method.
b0df2b200d77 sip-in: implement SIP CANCEL
Mychaela Falconia <falcon@freecalypso.org>
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3 */
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4
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5 #include <sys/types.h>
b0df2b200d77 sip-in: implement SIP CANCEL
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6 #include <sys/socket.h>
b0df2b200d77 sip-in: implement SIP CANCEL
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7 #include <netinet/in.h>
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8 #include <stdio.h>
b0df2b200d77 sip-in: implement SIP CANCEL
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9 #include <stdint.h>
b0df2b200d77 sip-in: implement SIP CANCEL
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include <syslog.h>
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14 #include "../include/gsm48_const.h"
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Mychaela Falconia <falcon@freecalypso.org>
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15 #include "../libsip/parse.h"
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Mychaela Falconia <falcon@freecalypso.org>
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16 #include "../libsip/uas_basic.h"
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Mychaela Falconia <falcon@freecalypso.org>
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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 struct call *find_call_by_sip_id();
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21
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22 static void
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23 cancel_200_response(req, ess, sin, call)
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24 struct sip_pkt_rx *req;
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25 struct uas_parse_hdrs *ess;
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26 struct sockaddr_in *sin;
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27 struct call *call;
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28 {
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29 struct sip_msg_out resp;
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30 char cseq_str[32];
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31 int rc;
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32
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33 start_response_out_msg(&resp, "200 OK");
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34 rc = out_msg_add_header(&resp, "From", call->invite_from);
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35 if (rc < 0) {
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36 msg_size_err: syslog(LOG_ERR, "CANCEL 200 response length exceeded");
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37 return;
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38 }
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39 rc = out_msg_add_header(&resp, "To", call->invite_to);
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40 if (rc < 0)
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41 goto msg_size_err;
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42 rc = out_msg_add_header(&resp, "Call-ID", call->sip_call_id);
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43 if (rc < 0)
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44 goto msg_size_err;
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45 sprintf(cseq_str, "%u CANCEL", call->invite_cseq);
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46 rc = out_msg_add_header(&resp, "CSeq", cseq_str);
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47 if (rc < 0)
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48 goto msg_size_err;
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49 rc = out_msg_add_header(&resp, "Via", ess->via);
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50 if (rc < 0)
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51 goto msg_size_err;
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52 out_msg_finish(&resp);
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53 sip_tx_packet(&resp, sin);
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54 }
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55
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56 static void
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57 cancel_481_response(req, ess, sin)
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58 struct sip_pkt_rx *req;
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59 struct uas_parse_hdrs *ess;
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60 struct sockaddr_in *sin;
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61 {
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62 struct sip_msg_out resp;
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63 int rc;
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64
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65 start_response_out_msg(&resp, "481 Call-ID/CSeq not found");
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66 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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67 if (rc < 0)
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68 return;
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69 out_msg_finish(&resp);
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70 sip_tx_packet(&resp, sin);
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71 }
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72
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73 void
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74 handle_sip_cancel(req, ess, sin)
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75 struct sip_pkt_rx *req;
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76 struct uas_parse_hdrs *ess;
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77 struct sockaddr_in *sin;
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78 {
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79 struct call *call;
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80
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81 call = find_call_by_sip_id(ess->call_id);
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82 if (!call) {
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83 cancel_481_response(req, ess, sin);
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84 return;
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85 }
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86 /* weed out wrong CSeq */
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87 if (ess->cseq_num != call->invite_cseq) {
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88 cancel_481_response(req, ess, sin);
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89 return;
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90 }
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91 /* it is for us - act on it */
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92 switch (call->sip_state) {
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93 case SIP_STATE_INVITE_PROC:
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94 case SIP_STATE_RINGING:
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95 case SIP_STATE_RINGING_PRACK:
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96 call->overall_state = OVERALL_STATE_TEARDOWN;
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97 disconnect_mncc(call, GSM48_CAUSE_LOC_NET_BEYOND,
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98 GSM48_CC_CAUSE_NORM_CALL_CLEAR);
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99 disconnect_tmgw(call);
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100 strcpy(call->invite_fail, "487 Call attempt terminated");
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101 signal_invite_error(call);
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102 break;
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103 case SIP_STATE_MSG_SIZE_ERR:
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Mychaela Falconia <falcon@freecalypso.org>
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104 return;
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Mychaela Falconia <falcon@freecalypso.org>
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105 }
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Mychaela Falconia <falcon@freecalypso.org>
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106 cancel_200_response(req, ess, sin, call);
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107 }