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annotate sip-out/uac_resp.c @ 267:81958b35f74d

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NANP validation: allow made-up area codes of N9X form
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 13 Nov 2023 15:28:09 -0800
parents 83022d408071
children
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1 /*
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2 * In this module we implement our handling of SIP responses in the UAC role.
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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 <sys/time.h>
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8 #include <netinet/in.h>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <syslog.h>
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15 #include "../include/gsm48_const.h"
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16 #include "../include/out_routes.h"
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17 #include "../libsip/parse.h"
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18 #include "../libsip/resp_ident.h"
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19 #include "call.h"
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20
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21 extern struct call *find_call_by_sip_id();
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22
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23 extern unsigned sip_linger_timeout;
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24 extern unsigned sip_linger_bye_out_ok;
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25 extern unsigned sip_linger_bye_out_err;
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26
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27 void
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28 handle_bye_response(call, msg, sin)
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29 struct call *call;
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30 struct sip_pkt_rx *msg;
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31 struct sockaddr_in *sin;
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32 {
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33 if (msg->status_code != 200)
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34 syslog(LOG_ERR, "non-200 response to BYE: %.64s",
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35 msg->status_str);
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36 if (msg->status_code < 200)
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37 return;
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38 if (call->sip_state == SIP_STATE_BYE_SENT) {
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39 call->sip_state = SIP_STATE_ENDED;
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40 if (msg->status_code <= 299)
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41 sip_mark_end_time(call, sip_linger_bye_out_ok);
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42 else
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43 sip_mark_end_time(call, sip_linger_bye_out_err);
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44 }
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45 }
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46
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47 void
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48 handle_cancel_response(call, msg, sin)
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49 struct call *call;
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50 struct sip_pkt_rx *msg;
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51 struct sockaddr_in *sin;
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52 {
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53 if (msg->status_code != 200)
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54 syslog(LOG_ERR, "non-200 response to CANCEL: %.64s",
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55 msg->status_str);
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56 if (msg->status_code < 200)
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57 return;
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58 if (call->sip_state == SIP_STATE_CANCEL_SENT) {
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59 call->sip_state = SIP_STATE_ACCEPT_200;
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60 if (msg->status_code <= 299)
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61 sip_mark_end_time(call, sip_linger_timeout);
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62 else
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63 sip_mark_end_time(call, sip_linger_bye_out_err);
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64 }
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65 }
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66
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67 void
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68 process_sip_response(msg, sin)
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69 struct sip_pkt_rx *msg;
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70 struct sockaddr_in *sin;
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71 {
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72 struct sip_resp_ident rid;
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73 struct call *call;
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74 int rc;
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75
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76 rc = sip_resp_extract_ident(msg, &rid);
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77 if (rc < 0) {
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78 syslog(LOG_ERR, "SIP %03u response: bad or missing %s header",
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79 msg->status_code, rid.error_field);
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80 return;
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81 }
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82 call = find_call_by_sip_id(rid.call_id);
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83 if (!call) {
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84 syslog(LOG_ERR, "SIP %03u response: unmatched Call-ID",
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85 msg->status_code);
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86 return;
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87 }
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88 if (rid.cseq_num == 1 && !strcmp(rid.cseq_method, "INVITE"))
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89 handle_invite_response(call, msg, sin);
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90 else if (rid.cseq_num == 1 && !strcmp(rid.cseq_method, "CANCEL"))
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91 handle_cancel_response(call, msg, sin);
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92 else if (rid.cseq_num == 2 && !strcmp(rid.cseq_method, "BYE"))
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93 handle_bye_response(call, msg, sin);
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94 else
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95 syslog(LOG_ERR,
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96 "UAC received %03u response with unknown CSeq %u %.32s",
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97 msg->status_code, rid.cseq_num, rid.cseq_method);
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98 }