FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/uac.c @ 191:6ac96217c442

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sip-manual-out: add SDP response parsing
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 17 Mar 2023 12:07:17 -0800
parents a36b731bfef9
children 10a4b0b0a239
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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 if (msg->status_code <= 299)
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110 extract_resp_sdp(msg);
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111 }
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112 }
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113
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114 void
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115 process_sip_response(msg, sin)
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116 struct sip_pkt_rx *msg;
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117 struct sockaddr_in *sin;
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118 {
118
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119 struct sip_resp_ident rid;
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120 int rc;
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121
118
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122 rc = sip_resp_extract_ident(msg, &rid);
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123 if (rc < 0) {
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124 printf("SIP %03u response: bad or missing %s header\n",
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125 msg->status_code, rid.error_field);
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126 return;
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127 }
118
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128 if (strcmp(rid.call_id, call_id)) {
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129 printf("Got SIP response with wrong Call-ID\n");
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130 return;
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131 }
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132 if (rid.cseq_num == 1 && !strcmp(rid.cseq_method, "INVITE"))
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133 handle_invite_response(msg, sin);
123
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134 else if (rid.cseq_num == 1 && !strcmp(rid.cseq_method, "CANCEL"))
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135 printf("Response to CANCEL: %s\n", msg->status_str);
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136 else if (rid.cseq_num == 2 && !strcmp(rid.cseq_method, "BYE"))
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137 printf("Response to BYE: %s\n", msg->status_str);
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138 else
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139 printf("Got SIP resp for our Call-ID with unknown CSeq %u %s\n",
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140 rid.cseq_num, rid.cseq_method);
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141 }