FreeCalypso > hg > themwi-system-sw
annotate sip-in/invite_dup.c @ 156:0bacca1f2f7b
sip-out: handle all INVITE responses, except errors
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 12 Oct 2022 07:13:55 -0800 |
parents | 54c2f271380d |
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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 |
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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); |
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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"); |
146
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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
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121 case SIP_STATE_INVITE_200: |
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122 case SIP_STATE_CONNECTED: |
146
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123 rc = fill_reinvite_resp_200(&resp, call, ess); |
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124 if (rc < 0) |
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125 goto msg_size_err; |
60
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126 sip_tx_packet(&resp, sin); |
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127 return; |
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128 case SIP_STATE_INVITE_ERR: |
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129 start_response_out_msg(&resp, call->invite_fail); |
146
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130 rc = fill_reinvite_resp(&resp, call, ess); |
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131 if (rc < 0) |
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132 goto msg_size_err; |
60
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133 out_msg_finish(&resp); |
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134 sip_tx_packet(&resp, sin); |
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135 return; |
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136 default: |
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137 /* silently discard */ |
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diff
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138 return; |
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parents:
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diff
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|
139 } |
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diff
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|
140 } |