FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/uac.c @ 82:ff4b76a107a1

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sip-in: process responses as UAC for BYE
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 20 Sep 2022 20:33:09 -0800
parents d7b6b8973a83
children a4450ae8fd09
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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/out_msg.h"
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15
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16 #define MAX_TO_TAG 63
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17
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18 extern char *get_single_header();
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19 extern char *extract_to_tag();
71
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20
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21 extern struct in_addr sip_bind_ip;
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22 extern unsigned sip_bind_port;
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23 extern char call_id[], from_uri[], to_uri[];
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24
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25 char to_tag[MAX_TO_TAG+1];
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26
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27 add_req_boilerplate(msg, cseq)
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28 struct sip_msg_out *msg;
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29 char *cseq;
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30 {
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31 char strbuf[256];
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32 int rc;
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33
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34 sprintf(strbuf, "SIP/2.0/UDP %s:%u",
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35 inet_ntoa(sip_bind_ip), sip_bind_port);
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36 rc = out_msg_add_header(msg, "Via", strbuf);
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37 if (rc < 0)
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38 return rc;
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39 rc = out_msg_add_header(msg, "From", from_uri);
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40 if (rc < 0)
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41 return rc;
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42 if (to_tag[0]) {
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43 sprintf(strbuf, "<%s>;tag=%s", to_uri, to_tag);
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44 rc = out_msg_add_header(msg, "To", strbuf);
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45 } else
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46 rc = out_msg_add_header(msg, "To", to_uri);
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47 if (rc < 0)
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48 return rc;
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49 rc = out_msg_add_header(msg, "Call-ID", call_id);
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50 if (rc < 0)
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51 return rc;
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52 rc = out_msg_add_header(msg, "CSeq", cseq);
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53 if (rc < 0)
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54 return rc;
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55 return out_msg_add_header(msg, "Max-Forwards", "70");
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56 }
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57
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58 add_contact_header(msg)
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59 struct sip_msg_out *msg;
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60 {
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61 char strbuf[80];
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62
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63 sprintf(strbuf, "<sip:%s:%u;transport=udp>",
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64 inet_ntoa(sip_bind_ip), sip_bind_port);
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65 return out_msg_add_header(msg, "Contact", strbuf);
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66 }
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67
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68 static void
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69 send_ack(sin)
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70 struct sockaddr_in *sin;
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71 {
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72 struct sip_msg_out msg;
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73 int rc;
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74
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75 rc = start_request_out_msg(&msg, "ACK", to_uri);
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76 if (rc < 0) {
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77 msg_size_err: fprintf(stderr, "composing ACK message: size error\n");
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78 return;
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79 }
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80 rc = add_req_boilerplate(&msg, "1 ACK");
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81 if (rc < 0)
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82 goto msg_size_err;
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83 out_msg_finish(&msg);
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84 sip_tx_packet(&msg, sin);
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85 }
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86
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87 static void
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88 handle_invite_response(msg, sin)
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89 struct sip_pkt_rx *msg;
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90 struct sockaddr_in *sin;
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91 {
73
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92 char *tag;
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93
71
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94 printf("Response to INVITE: %s\n", msg->status_str);
73
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95 tag = extract_to_tag(msg, to_uri);
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96 if (tag) {
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97 printf("To tag: %s\n", tag);
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98 if (strlen(tag) <= MAX_TO_TAG)
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99 strcpy(to_tag, tag);
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100 else
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101 printf("To tag exceeds length limit!\n");
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102 }
71
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103 if (msg->status_code >= 200) {
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104 printf("Sending ACK\n");
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105 send_ack(sin);
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106 }
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107 }
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108
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109 void
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110 process_sip_response(msg, sin)
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111 struct sip_pkt_rx *msg;
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112 struct sockaddr_in *sin;
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113 {
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114 char *call_id_hdr, *cseq_hdr;
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115
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116 call_id_hdr = get_single_header(msg, "Call-ID", "i", (int *) 0);
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117 if (!call_id_hdr) {
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118 printf("Got SIP response w/o Call-ID header\n");
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119 return;
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120 }
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121 if (strcmp(call_id_hdr, call_id)) {
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122 printf("Got SIP response with wrong Call-ID\n");
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123 return;
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124 }
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125 cseq_hdr = get_single_header(msg, "CSeq", (char *) 0, (int *) 0);
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126 if (!cseq_hdr) {
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127 printf("Got SIP response w/o CSeq header\n");
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128 return;
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129 }
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130 if (!strcmp(cseq_hdr, "1 INVITE"))
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131 handle_invite_response(msg, sin);
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132 else
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133 printf("Got SIP resp for our Call-ID with unknown CSeq %s\n",
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134 cseq_hdr);
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135 }