FreeCalypso > hg > themwi-system-sw
annotate sip-manual-out/uac.c @ 170:a6eb2de277f6
mgw: massive simplification for continuous RTP stream from BTS
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 20 Nov 2022 01:58:47 -0800 |
parents | a36b731bfef9 |
children | 6ac96217c442 |
rev | line source |
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1 /* |
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2 * Here we implement processing of SIP responses to the requests we sent out. |
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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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7 #include <netinet/in.h> |
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8 #include <arpa/inet.h> |
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9 #include <stdio.h> |
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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 "../libsip/parse.h" |
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14 #include "../libsip/resp_ident.h" |
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15 #include "../libsip/out_msg.h" |
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16 |
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17 #define MAX_TO_TAG 63 |
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18 |
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19 extern char *get_single_header(); |
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20 extern char *extract_to_tag(); |
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21 |
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22 extern struct in_addr sip_bind_ip; |
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23 extern unsigned sip_bind_port; |
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24 extern char call_id[], from_uri[], to_uri[]; |
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25 extern unsigned max_forwards; |
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26 |
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27 char to_tag[MAX_TO_TAG+1]; |
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28 |
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29 add_req_boilerplate(msg, cseq, add_to_tag) |
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30 struct sip_msg_out *msg; |
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31 char *cseq; |
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32 { |
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33 char strbuf[256]; |
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34 int rc; |
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35 |
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36 sprintf(strbuf, "SIP/2.0/UDP %s:%u", |
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37 inet_ntoa(sip_bind_ip), sip_bind_port); |
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38 rc = out_msg_add_header(msg, "Via", strbuf); |
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39 if (rc < 0) |
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40 return rc; |
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41 rc = out_msg_add_header(msg, "From", from_uri); |
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42 if (rc < 0) |
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43 return rc; |
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44 if (add_to_tag && to_tag[0]) { |
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45 sprintf(strbuf, "<%s>;tag=%s", to_uri, to_tag); |
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46 rc = out_msg_add_header(msg, "To", strbuf); |
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47 } else |
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48 rc = out_msg_add_header(msg, "To", to_uri); |
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49 if (rc < 0) |
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50 return rc; |
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51 rc = out_msg_add_header(msg, "Call-ID", call_id); |
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52 if (rc < 0) |
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53 return rc; |
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54 rc = out_msg_add_header(msg, "CSeq", cseq); |
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55 if (rc < 0) |
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56 return rc; |
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57 sprintf(strbuf, "%u", max_forwards); |
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58 return out_msg_add_header(msg, "Max-Forwards", strbuf); |
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59 } |
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60 |
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61 add_contact_header(msg) |
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62 struct sip_msg_out *msg; |
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63 { |
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64 char strbuf[80]; |
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65 |
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66 sprintf(strbuf, "<sip:%s:%u;transport=udp>", |
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67 inet_ntoa(sip_bind_ip), sip_bind_port); |
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68 return out_msg_add_header(msg, "Contact", strbuf); |
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69 } |
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70 |
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71 static void |
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72 send_ack(sin) |
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73 struct sockaddr_in *sin; |
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74 { |
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75 struct sip_msg_out msg; |
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76 int rc; |
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77 |
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78 rc = start_request_out_msg(&msg, "ACK", to_uri); |
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79 if (rc < 0) { |
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80 msg_size_err: fprintf(stderr, "composing ACK message: size error\n"); |
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81 return; |
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82 } |
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83 rc = add_req_boilerplate(&msg, "1 ACK", 1); |
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84 if (rc < 0) |
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85 goto msg_size_err; |
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86 out_msg_finish(&msg); |
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87 sip_tx_packet(&msg, sin); |
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88 } |
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89 |
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90 static void |
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91 handle_invite_response(msg, sin) |
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92 struct sip_pkt_rx *msg; |
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93 struct sockaddr_in *sin; |
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94 { |
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95 char *tag; |
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96 |
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97 printf("Response to INVITE: %s\n", msg->status_str); |
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98 tag = extract_to_tag(msg, to_uri); |
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99 if (tag) { |
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100 printf("To tag: %s\n", tag); |
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101 if (strlen(tag) <= MAX_TO_TAG) |
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102 strcpy(to_tag, tag); |
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103 else |
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104 printf("To tag exceeds length limit!\n"); |
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105 } |
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106 if (msg->status_code >= 200) { |
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107 printf("Sending ACK\n"); |
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108 send_ack(sin); |
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109 } |
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110 } |
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111 |
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112 void |
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113 process_sip_response(msg, sin) |
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114 struct sip_pkt_rx *msg; |
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115 struct sockaddr_in *sin; |
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116 { |
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117 struct sip_resp_ident rid; |
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118 int rc; |
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119 |
118
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120 rc = sip_resp_extract_ident(msg, &rid); |
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121 if (rc < 0) { |
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122 printf("SIP %03u response: bad or missing %s header\n", |
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123 msg->status_code, rid.error_field); |
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124 return; |
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125 } |
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126 if (strcmp(rid.call_id, call_id)) { |
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127 printf("Got SIP response with wrong Call-ID\n"); |
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128 return; |
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129 } |
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130 if (rid.cseq_num == 1 && !strcmp(rid.cseq_method, "INVITE")) |
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131 handle_invite_response(msg, sin); |
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132 else if (rid.cseq_num == 1 && !strcmp(rid.cseq_method, "CANCEL")) |
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133 printf("Response to CANCEL: %s\n", msg->status_str); |
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134 else if (rid.cseq_num == 2 && !strcmp(rid.cseq_method, "BYE")) |
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135 printf("Response to BYE: %s\n", msg->status_str); |
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136 else |
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137 printf("Got SIP resp for our Call-ID with unknown CSeq %u %s\n", |
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138 rid.cseq_num, rid.cseq_method); |
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139 } |