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comparison mncc/mncc_recv.c @ 15:ccc5ab6d8388

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first version of themwi-mncc for ThemWi2
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 26 Jun 2022 16:31:47 -0800
parents
children 660126bd5f59
comparison
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14:aea422af79dd 15:ccc5ab6d8388
1 /*
2 * In this module we implement initial handling of MNCC messages
3 * coming from OsmoMSC, dispatching them further as appropriate.
4 */
5
6 #include <sys/types.h>
7 #include <sys/socket.h>
8 #include <stdio.h>
9 #include <stdint.h>
10 #include <stdlib.h>
11 #include <syslog.h>
12 #include "../include/mncc.h"
13 #include "struct.h"
14 #include "gsm_call.h"
15
16 static void
17 report_runt(msg)
18 union mncc_msg *msg;
19 {
20 syslog(LOG_CRIT, "MNCC message type 0x%x from GSM is too short!",
21 msg->msg_type);
22 }
23
24 static void
25 handle_setup_ind(msg, msglen)
26 struct gsm_mncc *msg;
27 unsigned msglen;
28 {
29 struct gsm_call *call;
30
31 if (msglen < sizeof(struct gsm_mncc)) {
32 report_runt(msg);
33 return;
34 }
35 call = find_gsm_callref(msg->callref);
36 if (call) {
37 syslog(LOG_ERR, "duplicate MNCC_SETUP_IND for callref 0x%x",
38 msg->callref);
39 /* drop it like OsmoMSC's mncc_builtin does */
40 return;
41 }
42 /* further processing */
43 process_mo_call_setup(msg);
44 }
45
46 static void
47 handle_signaling_msg(msg, msglen)
48 struct gsm_mncc *msg;
49 unsigned msglen;
50 {
51 struct gsm_call *call;
52
53 if (msglen < sizeof(struct gsm_mncc)) {
54 report_runt(msg);
55 return;
56 }
57 call = find_gsm_callref(msg->callref);
58 if (!call) {
59 syslog(LOG_ERR,
60 "MNCC message type 0x%x: callref 0x%x not found",
61 msg->msg_type, msg->callref);
62 /* drop it like OsmoMSC's mncc_builtin does */
63 return;
64 }
65 if (msg->msg_type == MNCC_SETUP_CNF)
66 preen_connected_number(msg);
67 /* dispatch according to internal switch or socket */
68 if (call->socket)
69 mncc_signal_to_socket(call, msg);
70 else
71 internal_switch_mncc(call, msg);
72 }
73
74 static void
75 handle_release_msg(msg, msglen)
76 struct gsm_mncc *msg;
77 unsigned msglen;
78 {
79 struct gsm_call *call;
80
81 if (msglen < sizeof(struct gsm_mncc)) {
82 report_runt(msg);
83 return;
84 }
85 call = find_gsm_callref(msg->callref);
86 if (!call) {
87 syslog(LOG_ERR,
88 "MNCC message type 0x%x: callref 0x%x not found",
89 msg->msg_type, msg->callref);
90 /* drop it like OsmoMSC's mncc_builtin does */
91 return;
92 }
93 /* dispatch according to internal switch or socket */
94 if (call->socket) {
95 mncc_signal_to_socket(call, msg);
96 extsock_dec_refcount(call->socket);
97 call->gc_flag = 1;
98 } else
99 internal_switch_mncc(call, msg);
100 }
101
102 static void
103 handle_rtp_msg(msg, msglen)
104 struct gsm_mncc_rtp *msg;
105 unsigned msglen;
106 {
107 struct gsm_call *call;
108
109 if (msglen < sizeof(struct gsm_mncc_rtp)) {
110 report_runt(msg);
111 return;
112 }
113 call = find_gsm_callref(msg->callref);
114 if (!call) {
115 syslog(LOG_ERR,
116 "MNCC message type 0x%x: callref 0x%x not found",
117 msg->msg_type, msg->callref);
118 /* drop it like OsmoMSC's mncc_builtin does */
119 return;
120 }
121 /* only for socket connections - no RTP handling for internal */
122 if (call->socket)
123 mncc_rtp_to_socket(call, msg);
124 }
125
126 static void
127 handle_mncc_hello(msg, msglen)
128 struct gsm_mncc_hello *msg;
129 unsigned msglen;
130 {
131 if (msglen < sizeof(struct gsm_mncc_hello)) {
132 syslog(LOG_CRIT, "MNCC_SOCKET_HELLO message is too short!");
133 exit(1);
134 }
135 if (msg->version != MNCC_SOCK_VERSION) {
136 syslog(LOG_CRIT, "MNCC hello error: version number mismatch");
137 exit(1);
138 }
139 if (msg->mncc_size != sizeof(struct gsm_mncc)) {
140 syslog(LOG_CRIT, "MNCC hello error: mncc_size mismatch");
141 exit(1);
142 }
143 }
144
145 void
146 mncc_msg_from_gsm(msg, msglen)
147 union mncc_msg *msg;
148 unsigned msglen;
149 {
150 switch (msg->msg_type) {
151 case MNCC_SETUP_IND:
152 handle_setup_ind(msg, msglen);
153 return;
154 case MNCC_SETUP_CNF:
155 case MNCC_SETUP_COMPL_IND:
156 case MNCC_CALL_CONF_IND:
157 case MNCC_ALERT_IND:
158 case MNCC_NOTIFY_IND:
159 case MNCC_DISC_IND:
160 case MNCC_FACILITY_IND:
161 case MNCC_START_DTMF_IND:
162 case MNCC_STOP_DTMF_IND:
163 case MNCC_MODIFY_IND:
164 case MNCC_MODIFY_CNF:
165 case MNCC_MODIFY_REJ:
166 case MNCC_HOLD_IND:
167 case MNCC_RETRIEVE_IND:
168 case MNCC_USERINFO_IND:
169 handle_signaling_msg(msg, msglen);
170 return;
171 case MNCC_REL_IND:
172 case MNCC_REL_CNF:
173 case MNCC_REJ_IND:
174 handle_release_msg(msg, msglen);
175 return;
176 case MNCC_RTP_CREATE:
177 case MNCC_RTP_CONNECT:
178 case MNCC_RTP_FREE:
179 handle_rtp_msg(msg, msglen);
180 return;
181 case MNCC_SOCKET_HELLO:
182 handle_mncc_hello(msg, msglen);
183 return;
184 default:
185 syslog(LOG_CRIT, "unknown MNCC message type 0x%x from GSM",
186 msg->msg_type);
187 }
188 }