FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/uac.c @ 118:a4450ae8fd09

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sip-manual-out UAC: use the new CSeq parsing function
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 29 Sep 2022 13:03:27 -0800
parents d7b6b8973a83
children c62d0f28da6f
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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
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26 char to_tag[MAX_TO_TAG+1];
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27
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28 add_req_boilerplate(msg, cseq)
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29 struct sip_msg_out *msg;
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30 char *cseq;
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31 {
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32 char strbuf[256];
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33 int rc;
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34
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35 sprintf(strbuf, "SIP/2.0/UDP %s:%u",
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36 inet_ntoa(sip_bind_ip), sip_bind_port);
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37 rc = out_msg_add_header(msg, "Via", strbuf);
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38 if (rc < 0)
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39 return rc;
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40 rc = out_msg_add_header(msg, "From", from_uri);
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41 if (rc < 0)
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42 return rc;
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43 if (to_tag[0]) {
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44 sprintf(strbuf, "<%s>;tag=%s", to_uri, to_tag);
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45 rc = out_msg_add_header(msg, "To", strbuf);
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46 } else
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47 rc = out_msg_add_header(msg, "To", to_uri);
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48 if (rc < 0)
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49 return rc;
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50 rc = out_msg_add_header(msg, "Call-ID", call_id);
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51 if (rc < 0)
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52 return rc;
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53 rc = out_msg_add_header(msg, "CSeq", cseq);
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54 if (rc < 0)
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55 return rc;
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56 return out_msg_add_header(msg, "Max-Forwards", "70");
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57 }
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58
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59 add_contact_header(msg)
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60 struct sip_msg_out *msg;
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61 {
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62 char strbuf[80];
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63
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64 sprintf(strbuf, "<sip:%s:%u;transport=udp>",
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65 inet_ntoa(sip_bind_ip), sip_bind_port);
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66 return out_msg_add_header(msg, "Contact", strbuf);
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67 }
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68
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69 static void
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70 send_ack(sin)
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71 struct sockaddr_in *sin;
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72 {
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73 struct sip_msg_out msg;
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74 int rc;
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75
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76 rc = start_request_out_msg(&msg, "ACK", to_uri);
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77 if (rc < 0) {
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78 msg_size_err: fprintf(stderr, "composing ACK message: size error\n");
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79 return;
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80 }
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81 rc = add_req_boilerplate(&msg, "1 ACK");
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82 if (rc < 0)
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83 goto msg_size_err;
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84 out_msg_finish(&msg);
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85 sip_tx_packet(&msg, sin);
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86 }
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87
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88 static void
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89 handle_invite_response(msg, sin)
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90 struct sip_pkt_rx *msg;
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91 struct sockaddr_in *sin;
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92 {
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93 char *tag;
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94
71
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95 printf("Response to INVITE: %s\n", msg->status_str);
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96 tag = extract_to_tag(msg, to_uri);
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97 if (tag) {
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98 printf("To tag: %s\n", tag);
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99 if (strlen(tag) <= MAX_TO_TAG)
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100 strcpy(to_tag, tag);
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101 else
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102 printf("To tag exceeds length limit!\n");
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103 }
71
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104 if (msg->status_code >= 200) {
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105 printf("Sending ACK\n");
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106 send_ack(sin);
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107 }
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108 }
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109
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110 void
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111 process_sip_response(msg, sin)
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112 struct sip_pkt_rx *msg;
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113 struct sockaddr_in *sin;
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114 {
118
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115 struct sip_resp_ident rid;
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116 int rc;
71
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117
118
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118 rc = sip_resp_extract_ident(msg, &rid);
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119 if (rc < 0) {
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120 printf("SIP %03u response: bad or missing %s header\n",
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121 msg->status_code, rid.error_field);
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122 return;
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123 }
118
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124 if (strcmp(rid.call_id, call_id)) {
71
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125 printf("Got SIP response with wrong Call-ID\n");
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126 return;
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127 }
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128 if (rid.cseq_num == 1 && !strcmp(rid.cseq_method, "INVITE"))
71
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129 handle_invite_response(msg, sin);
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130 else
118
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131 printf("Got SIP resp for our Call-ID with unknown CSeq %u %s\n",
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132 rid.cseq_num, rid.cseq_method);
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133 }