FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/uas.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 dd845c4933e1
children 94b5831c017f
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1 /*
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2 * UAS for sip-manual-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 <stdio.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <strings.h>
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12 #include "../libsip/parse.h"
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13 #include "../libsip/uas_basic.h"
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14 #include "../libsip/out_msg.h"
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15
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16 extern char call_id[];
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17
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18 static void
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19 bye_correct_call(req, ess, sin)
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20 struct sip_pkt_rx *req;
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21 struct uas_parse_hdrs *ess;
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22 struct sockaddr_in *sin;
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23 {
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24 struct sip_msg_out resp;
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25 int rc;
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27 printf("Received BYE for our call, responding with 200\n");
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28 start_response_out_msg(&resp, "200 OK");
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29 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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30 if (rc < 0) {
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31 fprintf(stderr, "sending 200 response: msg length exceeded\n");
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32 return;
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33 }
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34 out_msg_finish(&resp);
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35 sip_tx_packet(&resp, sin);
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36 }
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38 static void
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39 bye_unknown_call(req, ess, sin)
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40 struct sip_pkt_rx *req;
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41 struct uas_parse_hdrs *ess;
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42 struct sockaddr_in *sin;
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43 {
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44 struct sip_msg_out resp;
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45 int rc;
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46
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47 printf("Received BYE for unknown call, responding with 481\n");
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48 start_response_out_msg(&resp, "481 Call-ID not found");
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49 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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50 if (rc < 0) {
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51 fprintf(stderr, "sending 481 response: msg length exceeded\n");
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52 return;
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53 }
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54 out_msg_finish(&resp);
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55 sip_tx_packet(&resp, sin);
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56 }
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58 static void
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59 handle_bye(req, ess, sin)
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60 struct sip_pkt_rx *req;
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61 struct uas_parse_hdrs *ess;
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62 struct sockaddr_in *sin;
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63 {
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64 if (!strcmp(ess->call_id, call_id))
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65 bye_correct_call(req, ess, sin);
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66 else
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67 bye_unknown_call(req, ess, sin);
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68 }
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70 static void
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71 unsupported_method(req, ess, sin)
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72 struct sip_pkt_rx *req;
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73 struct uas_parse_hdrs *ess;
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74 struct sockaddr_in *sin;
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75 {
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76 struct sip_msg_out resp;
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77 int rc;
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78
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79 printf("SIP %.16s request: unsupported method\n", req->req_method);
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80 start_response_out_msg(&resp, "501 Method not supported");
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81 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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82 if (rc < 0) {
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83 too_long: fprintf(stderr,
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84 "sending 501 error: response length exceeded\n");
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85 return;
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86 }
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87 rc = out_msg_add_header(&resp, "Allow", "BYE");
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88 if (rc < 0)
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89 goto too_long;
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90 out_msg_finish(&resp);
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91 sip_tx_packet(&resp, sin);
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92 }
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93
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94 void
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95 process_sip_request(msg, sin)
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96 struct sip_pkt_rx *msg;
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97 struct sockaddr_in *sin;
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98 {
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99 struct uas_parse_hdrs ess;
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100 int rc;
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101
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102 rc = uas_get_basic_headers(msg, &ess);
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103 if (rc < 0) {
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104 printf("SIP %.16s request: bad or missing %s header\n",
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105 msg->req_method, ess.error_field);
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106 return;
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107 }
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108 /* dispatch by method */
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109 if (!strcmp(msg->req_method, "BYE"))
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110 handle_bye(msg, &ess, sin);
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111 else if (!strcmp(msg->req_method, "ACK"))
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112 printf("Received unexpected ACK, swallowing it\n");
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113 else
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114 unsupported_method(msg, &ess, sin);
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115 }