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comparison sip-in/cancel.c @ 79:b0df2b200d77

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sip-in: implement SIP CANCEL
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 20 Sep 2022 18:58:11 -0800
parents
children 0d6435808bcd
comparison
equal deleted inserted replaced
78:72b7d85d6354 79:b0df2b200d77
1 /*
2 * Here we implement our handling of SIP CANCEL method.
3 */
4
5 #include <sys/types.h>
6 #include <sys/socket.h>
7 #include <netinet/in.h>
8 #include <stdio.h>
9 #include <stdint.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <strings.h>
13 #include <syslog.h>
14 #include "../include/gsm48_const.h"
15 #include "../libsip/parse.h"
16 #include "../libsip/uas_basic.h"
17 #include "../libsip/out_msg.h"
18 #include "call.h"
19
20 extern struct call *find_call_by_sip_id();
21
22 static void
23 cancel_200_response(req, ess, sin, call)
24 struct sip_pkt_rx *req;
25 struct uas_parse_hdrs *ess;
26 struct sockaddr_in *sin;
27 struct call *call;
28 {
29 struct sip_msg_out resp;
30 char cseq_str[32];
31 int rc;
32
33 start_response_out_msg(&resp, "200 OK");
34 rc = out_msg_add_header(&resp, "From", call->invite_from);
35 if (rc < 0) {
36 msg_size_err: syslog(LOG_ERR, "CANCEL 200 response length exceeded");
37 return;
38 }
39 rc = out_msg_add_header(&resp, "To", call->invite_to);
40 if (rc < 0)
41 goto msg_size_err;
42 rc = out_msg_add_header(&resp, "Call-ID", call->sip_call_id);
43 if (rc < 0)
44 goto msg_size_err;
45 sprintf(cseq_str, "%u CANCEL", call->invite_cseq);
46 rc = out_msg_add_header(&resp, "CSeq", cseq_str);
47 if (rc < 0)
48 goto msg_size_err;
49 rc = out_msg_add_header(&resp, "Via", ess->via);
50 if (rc < 0)
51 goto msg_size_err;
52 out_msg_finish(&resp);
53 sip_tx_packet(&resp, sin);
54 }
55
56 static void
57 cancel_481_response(req, ess, sin)
58 struct sip_pkt_rx *req;
59 struct uas_parse_hdrs *ess;
60 struct sockaddr_in *sin;
61 {
62 struct sip_msg_out resp;
63 int rc;
64
65 start_response_out_msg(&resp, "481 Call-ID/CSeq not found");
66 rc = add_resp_basic_headers(&resp, ess, req->req_method);
67 if (rc < 0)
68 return;
69 out_msg_finish(&resp);
70 sip_tx_packet(&resp, sin);
71 }
72
73 void
74 handle_sip_cancel(req, ess, sin)
75 struct sip_pkt_rx *req;
76 struct uas_parse_hdrs *ess;
77 struct sockaddr_in *sin;
78 {
79 struct call *call;
80
81 call = find_call_by_sip_id(ess->call_id);
82 if (!call) {
83 cancel_481_response(req, ess, sin);
84 return;
85 }
86 /* weed out wrong CSeq */
87 if (ess->cseq_num != call->invite_cseq) {
88 cancel_481_response(req, ess, sin);
89 return;
90 }
91 /* it is for us - act on it */
92 switch (call->sip_state) {
93 case SIP_STATE_INVITE_PROC:
94 case SIP_STATE_RINGING:
95 case SIP_STATE_RINGING_PRACK:
96 call->overall_state = OVERALL_STATE_TEARDOWN;
97 disconnect_mncc(call, GSM48_CAUSE_LOC_NET_BEYOND,
98 GSM48_CC_CAUSE_NORM_CALL_CLEAR);
99 disconnect_tmgw(call);
100 strcpy(call->invite_fail, "487 Call attempt terminated");
101 signal_invite_error(call);
102 break;
103 case SIP_STATE_MSG_SIZE_ERR:
104 return;
105 }
106 cancel_200_response(req, ess, sin, call);
107 }