FreeCalypso > hg > themwi-system-sw

annotate sip-in/prack.c @ 108:0d6435808bcd

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sip-in: implement 100rel for 180 Ringing response
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Sep 2022 14:29:10 -0800
parents
children 9b87894704eb
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108
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * Here we implement our handling of SIP PRACK, expected from callers
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
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3 * when we send them a reliable 180 Ringing response.
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4 */
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5
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <netinet/in.h>
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9 #include <ctype.h>
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15 #include <syslog.h>
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
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16 #include "../include/gsm48_const.h"
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
Mychaela Falconia <falcon@freecalypso.org>
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17 #include "../libsip/parse.h"
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18 #include "../libsip/uas_basic.h"
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
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19 #include "../libsip/out_msg.h"
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20 #include "call.h"
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21
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22 extern char *get_single_header();
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23 extern struct call *find_call_by_sip_id();
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24
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
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25 void
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26 handle_sip_prack(req, ess, sin)
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27 struct sip_pkt_rx *req;
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28 struct uas_parse_hdrs *ess;
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29 struct sockaddr_in *sin;
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30 {
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31 struct call *call;
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Mychaela Falconia <falcon@freecalypso.org>
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32 struct sip_msg_out resp;
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33 char *rack, *orig_method, *cp;
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34 unsigned rseq, orig_num;
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35 int rc;
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36
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37 call = find_call_by_sip_id(ess->call_id);
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38 if (!call) {
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39 start_response_out_msg(&resp, "481 Call-ID not found");
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Mychaela Falconia <falcon@freecalypso.org>
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40 error_resp: rc = add_resp_basic_headers(&resp, ess, req->req_method);
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41 if (rc < 0)
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42 return;
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43 out_msg_finish(&resp);
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44 sip_tx_packet(&resp, sin);
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45 return;
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46 }
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47 rack = get_single_header(req, "RAck", (char *) 0, (int *) 0);
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
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48 if (!rack) {
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49 start_response_out_msg(&resp, "400 Missing RAck header");
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50 goto error_resp;
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51 }
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52 if (!isdigit(*rack)) {
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53 malformed: start_response_out_msg(&resp, "400 Malformed RAck header");
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54 goto error_resp;
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55 }
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56 rseq = strtoul(rack, &cp, 10);
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57 if (!isspace(*cp))
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58 goto malformed;
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59 while (isspace(*cp))
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60 cp++;
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61 if (!isdigit(*cp))
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62 goto malformed;
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63 orig_num = strtoul(cp, &cp, 10);
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64 if (!isspace(*cp))
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65 goto malformed;
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66 while (isspace(*cp))
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67 cp++;
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68 if (!isupper(*cp))
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69 goto malformed;
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70 orig_method = cp;
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71 while (isalnum(*cp))
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72 cp++;
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73 if (*cp)
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74 goto malformed;
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75 if (rseq != 1 || orig_num != call->invite_cseq ||
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76 strcmp(orig_method, "INVITE")) {
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77 start_response_out_msg(&resp,
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78 "481 RAck fails to match our 100rel response");
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79 goto error_resp;
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80 }
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81 switch (call->sip_state) {
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82 case SIP_STATE_RINGING_REL:
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83 call->sip_state = SIP_STATE_RINGING;
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84 start_response_out_msg(&resp, "200 OK");
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85 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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86 if (rc < 0) {
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87 syslog(LOG_ERR, "PRACK 200 response length exceeded");
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88 call->sip_state = SIP_STATE_MSG_SIZE_ERR;
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89 call->overall_state = OVERALL_STATE_TEARDOWN;
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90 disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU,
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91 GSM48_CC_CAUSE_INTERWORKING);
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92 disconnect_tmgw(call);
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93 /* TODO: transition from TEARDOWN to DEAD_SIP */
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94 return;
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95 }
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96 out_msg_finish(&resp);
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97 sip_tx_packet(&resp, sin);
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98 return;
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99 case SIP_STATE_RINGING:
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Mychaela Falconia <falcon@freecalypso.org>
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100 case SIP_STATE_INVITE_200:
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101 start_response_out_msg(&resp, "200 OK");
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102 rc = add_resp_basic_headers(&resp, ess, req->req_method);
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103 if (rc < 0)
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104 return;
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105 out_msg_finish(&resp);
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106 sip_tx_packet(&resp, sin);
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107 return;
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108 case SIP_STATE_INVITE_PROC:
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109 case SIP_STATE_CONNECTED:
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110 case SIP_STATE_BYE_SENT:
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111 case SIP_STATE_INVITE_ERR:
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112 case SIP_STATE_ENDED:
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113 start_response_out_msg(&resp,
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114 "481 No outstanding 100rel response");
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115 goto error_resp;
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116 }
0d6435808bcd sip-in: implement 100rel for 180 Ringing response
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117 }