FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/uac.c @ 124:7e04d28fae8b

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sip-in: default use-100rel to no BulkVS servers act badly when we send a reliable 180 Ringing response to an incoming call, even though they advertise 100rel support in the Supported header in the INVITE packet, and we probably won't be implementing 100rel for outbound because doing per-the-spec PRACK as a UAC is just too burdensome. Therefore, we need to consider 100rel extension as not-really-supported in themwi-system-sw.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 15:54:50 -0800
parents a36b731bfef9
children 6ac96217c442
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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 }
71
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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 {
118
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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 }
118
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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 }
118
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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);
a36b731bfef9 sip-manual-out: implement sending BYE and CANCEL
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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 }