FreeCalypso > hg > themwi-system-sw

annotate sip-in/invite_dup.c @ 146:54c2f271380d

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sip-in: implement play-along responses to re-INVITEs
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 08 Oct 2022 19:53:23 -0800
parents 4b685a5d9bd4
children
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1 /*
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2 * Here we process SIP INVITE retransmissions and/or re-INVITEs
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3 * for existing calls. Our new approach is that we shall generate
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4 * the same stateless response without caring if it's a retransmission
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5 * or a re-INVITE, using CSeq and Via from the (re-)INVITE packet
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6 * we are responding to. Our previous approach was to reject all
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7 * re-INVITE requests, but it turns out that we have to support them
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8 * in order to satisfy BulkVS and other calling servers that use
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9 * session timers.
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10 */
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11
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12 #include <sys/types.h>
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13 #include <sys/socket.h>
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14 #include <sys/time.h>
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15 #include <netinet/in.h>
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16 #include <arpa/inet.h>
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17 #include <stdio.h>
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18 #include <stdint.h>
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19 #include <stdlib.h>
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20 #include <string.h>
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21 #include <strings.h>
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22 #include <syslog.h>
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23 #include "../libsip/parse.h"
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24 #include "../libsip/uas_basic.h"
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25 #include "../libsip/sdp.h"
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26 #include "../libsip/out_msg.h"
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27 #include "call.h"
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28
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29 extern struct in_addr sip_bind_ip;
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30 extern unsigned sip_bind_port;
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31
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32 static
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33 fill_reinvite_resp(msg, call, ess)
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34 struct sip_msg_out *msg;
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35 struct call *call;
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36 struct uas_parse_hdrs *ess;
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37 {
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38 char cseq_str[32];
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39 int rc;
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40
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41 rc = out_msg_add_header(msg, "From", call->invite_from);
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42 if (rc < 0)
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43 return rc;
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44 rc = out_msg_add_header(msg, "To", call->invite_to);
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45 if (rc < 0)
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46 return rc;
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47 rc = out_msg_add_header(msg, "Call-ID", call->sip_call_id);
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48 if (rc < 0)
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49 return rc;
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50 sprintf(cseq_str, "%u INVITE", ess->cseq_num);
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51 rc = out_msg_add_header(msg, "CSeq", cseq_str);
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52 if (rc < 0)
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53 return rc;
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54 return out_msg_add_header(msg, "Via", ess->via);
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55 }
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56
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57 static
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58 fill_reinvite_resp_200(msg, call, ess)
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59 struct sip_msg_out *msg;
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60 struct call *call;
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61 struct uas_parse_hdrs *ess;
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62 {
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63 char contact_str[80];
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64 struct sdp_gen sdp;
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65 int rc;
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66
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67 start_response_out_msg(msg, "200 CONNECT");
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68 rc = fill_reinvite_resp(msg, call, ess);
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69 if (rc < 0)
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70 return rc;
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71 sprintf(contact_str, "<sip:%s:%u;transport=udp>",
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72 inet_ntoa(sip_bind_ip), sip_bind_port);
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73 rc = out_msg_add_header(msg, "Contact", contact_str);
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74 if (rc < 0)
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75 return rc;
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76 rc = out_msg_add_header(msg, "Content-Type", "application/sdp");
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77 if (rc < 0)
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78 return rc;
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79 bzero(&sdp, sizeof sdp);
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80 sdp.conn_ip = call->pstn_rtp_local.sin_addr;
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81 sdp.conn_port = ntohs(call->pstn_rtp_local.sin_port);
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82 sdp.codec_mask = call->use_pcma ? SDP_CODEC_MASK_PCMA
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83 : SDP_CODEC_MASK_PCMU;
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84 sdp.session_id = (sdp.conn_port << 16) | call->sdp_addend;
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85 sdp.owner_ip = sip_bind_ip;
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86 return out_msg_finish_sdp(msg, &sdp);
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87 }
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88
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89 void
60
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90 invite_existing_call(req, ess, sin, call)
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91 struct sip_pkt_rx *req;
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92 struct uas_parse_hdrs *ess;
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93 struct sockaddr_in *sin;
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94 struct call *call;
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95 {
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96 struct sip_msg_out resp;
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97 int rc;
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98
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99 switch (call->sip_state) {
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100 case SIP_STATE_INVITE_PROC:
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101 start_response_out_msg(&resp, "100 Proceeding");
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102 rc = fill_reinvite_resp(&resp, call, ess);
60
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103 if (rc < 0) {
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104 msg_size_err: syslog(LOG_ERR,
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105 "Call in%06u: msg size error on re-INVITE response",
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106 call->in_tag_num);
60
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107 return;
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108 }
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109 out_msg_finish(&resp);
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110 sip_tx_packet(&resp, sin);
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111 return;
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112 case SIP_STATE_RINGING:
108
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113 case SIP_STATE_RINGING_REL:
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114 start_response_out_msg(&resp, "180 Ringing");
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115 rc = fill_reinvite_resp(&resp, call, ess);
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116 if (rc < 0)
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117 goto msg_size_err;
108
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118 out_msg_finish(&resp);
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119 sip_tx_packet(&resp, sin);
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120 return;
60
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
121 case SIP_STATE_INVITE_200:
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
122 case SIP_STATE_CONNECTED:
146
54c2f271380d sip-in: implement play-along responses to re-INVITEs
Mychaela Falconia <falcon@freecalypso.org>
parents: 145
diff changeset
123 rc = fill_reinvite_resp_200(&resp, call, ess);
54c2f271380d sip-in: implement play-along responses to re-INVITEs
Mychaela Falconia <falcon@freecalypso.org>
parents: 145
diff changeset
124 if (rc < 0)
54c2f271380d sip-in: implement play-along responses to re-INVITEs
Mychaela Falconia <falcon@freecalypso.org>
parents: 145
diff changeset
125 goto msg_size_err;
60
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
126 sip_tx_packet(&resp, sin);
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
127 return;
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
128 case SIP_STATE_INVITE_ERR:
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
129 start_response_out_msg(&resp, call->invite_fail);
146
54c2f271380d sip-in: implement play-along responses to re-INVITEs
Mychaela Falconia <falcon@freecalypso.org>
parents: 145
diff changeset
130 rc = fill_reinvite_resp(&resp, call, ess);
54c2f271380d sip-in: implement play-along responses to re-INVITEs
Mychaela Falconia <falcon@freecalypso.org>
parents: 145
diff changeset
131 if (rc < 0)
54c2f271380d sip-in: implement play-along responses to re-INVITEs
Mychaela Falconia <falcon@freecalypso.org>
parents: 145
diff changeset
132 goto msg_size_err;
60
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
133 out_msg_finish(&resp);
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
134 sip_tx_packet(&resp, sin);
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
135 return;
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
136 default:
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
137 /* silently discard */
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
138 return;
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
139 }
02761f1ae5e5 sip-in INVITE processing: got as far as CRCX completion
Mychaela Falconia <falcon@freecalypso.org>
parents: 57
diff changeset
140 }