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annotate mncc/extsock.c @ 275:def9f6e4f49e default tip

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doc/Use-outside-USA: Fake-NANP-numbers article is here
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 Nov 2023 21:49:19 -0800
parents 660126bd5f59
children
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1 /*
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2 * In this module we gather functions that deal with external
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3 * socket connections, both externally-originating MT calls
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4 * and outbound MO calls.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/socket.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/mncc.h"
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16 #include "../include/gsm48_const.h"
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17 #include "struct.h"
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18 #include "gsm_call.h"
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19
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20 extern char *mncc_msg_name();
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22 void
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23 extsock_dec_refcount(conn)
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24 struct socket_conn *conn;
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25 {
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26 if (!conn->ncalls) {
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27 syslog(LOG_CRIT, "FATAL BUG: ncalls=0 on socket call clearing");
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28 exit(1);
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29 }
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30 conn->ncalls--;
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31 }
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32
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33 static void
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34 send_rel_on_broken_socket(call)
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35 struct gsm_call *call;
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36 {
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37 struct gsm_mncc msg;
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38
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39 bzero(&msg, sizeof(struct gsm_mncc));
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40 msg.msg_type = MNCC_REL_REQ;
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41 msg.callref = call->callref;
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42 mncc_set_cause(&msg, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_DEST_OOO);
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43 send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc));
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44 }
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45
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46 static void
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47 broken_socket_clear_calls(conn)
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48 struct socket_conn *conn;
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49 {
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50 extern struct gsm_call *call_list_head;
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51 struct gsm_call *call;
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52
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53 for (call = call_list_head; call; call = call->next) {
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54 if (call->gc_flag)
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55 continue;
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56 if (call->socket == conn) {
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57 syslog(LOG_WARNING,
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58 "clearing broken socket call: GSM callref 0x%x, socket ref 0x%x",
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59 call->callref, call->socket_ref);
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60 send_rel_on_broken_socket(call);
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61 extsock_dec_refcount(conn);
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62 call->gc_flag = 1;
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63 }
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64 }
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65 if (conn->ncalls) {
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66 syslog(LOG_CRIT,
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67 "FATAL BUG: ncalls!=0 after broken socket call clearing");
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68 exit(1);
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69 }
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70 }
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71
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72 static void
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73 report_runt(msg)
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74 union mncc_msg *msg;
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75 {
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76 syslog(LOG_CRIT,
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77 "MNCC message type 0x%x from ThemWi call socket is too short!",
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78 msg->msg_type);
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79 }
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80
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81 static void
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82 handle_setup_req(conn, msg, msglen)
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83 struct socket_conn *conn;
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84 struct gsm_mncc *msg;
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85 unsigned msglen;
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86 {
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87 struct gsm_call *call;
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88
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89 if (msglen < sizeof(struct gsm_mncc)) {
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90 report_runt(msg);
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91 return;
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92 }
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93 syslog(LOG_DEBUG, "Rx MNCC_SETUP_REQ from socket, callref=0x%x",
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94 msg->callref);
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95 call = find_socket_call(conn, msg->callref);
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96 if (call) {
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97 syslog(LOG_ERR,
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98 "duplicate MNCC_SETUP_REQ from socket for callref 0x%x",
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99 msg->callref);
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100 /* drop it like OsmoMSC's mncc_builtin does */
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101 return;
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102 }
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103 /* further processing */
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104 process_ext_mtcall_setup(conn, msg);
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105 }
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106
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107 static void
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108 handle_signaling_msg(conn, msg, msglen)
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109 struct socket_conn *conn;
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110 struct gsm_mncc *msg;
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111 unsigned msglen;
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112 {
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113 struct gsm_call *call;
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114
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115 if (msglen < sizeof(struct gsm_mncc)) {
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116 report_runt(msg);
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117 return;
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118 }
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119 syslog(LOG_DEBUG, "Rx %s from socket, callref=0x%x",
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120 mncc_msg_name(msg->msg_type), msg->callref);
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121 call = find_socket_call(conn, msg->callref);
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122 if (!call) {
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123 syslog(LOG_ERR,
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124 "MNCC message from ThemWi call socket: callref 0x%x not found",
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125 msg->callref);
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126 /* drop it like OsmoMSC's mncc_builtin does */
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127 return;
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128 }
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129 /* forward to GSM MNCC interface */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 msg->callref = call->callref;
27
c6572f4c31d2 themwi-mncc: fix bug in forwarding from call socket to GSM
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
131 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
15
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parents:
diff changeset
132 if (msg->msg_type == MNCC_REJ_REQ) {
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 extsock_dec_refcount(conn);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 call->gc_flag = 1;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 static void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 handle_rtp_msg(conn, msg, msglen)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 struct socket_conn *conn;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 struct gsm_mncc_rtp *msg;
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parents:
diff changeset
142 unsigned msglen;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 struct gsm_call *call;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 if (msglen < sizeof(struct gsm_mncc_rtp)) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 report_runt(msg);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 }
28
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
150 syslog(LOG_DEBUG, "Rx %s from socket, callref=0x%x",
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
151 mncc_msg_name(msg->msg_type), msg->callref);
15
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 call = find_socket_call(conn, msg->callref);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 if (!call) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 syslog(LOG_ERR,
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 "MNCC message from ThemWi call socket: callref 0x%x not found",
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 msg->callref);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 /* drop it like OsmoMSC's mncc_builtin does */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 /* forward to GSM MNCC interface */
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 msg->callref = call->callref;
27
c6572f4c31d2 themwi-mncc: fix bug in forwarding from call socket to GSM
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
162 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc_rtp));
15
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 extsock_read_select(conn)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 struct socket_conn *conn;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 {
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 union mncc_msg msg;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 int rc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 rc = recv(conn->fd, &msg, sizeof msg, 0);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 if (rc < 4) {
28
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
174 if (conn->ncalls) {
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
175 syslog(LOG_ERR, "ext socket broken with calls present");
15
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 broken_socket_clear_calls(conn);
28
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
177 } else
660126bd5f59 themwi-mncc: fix one bug, add debug syslog output
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
178 syslog(LOG_INFO, "normal closing of ext socket");
15
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 close(conn->fd);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 conn->fd = -1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 switch (msg.msg_type) {
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 case MNCC_SETUP_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 handle_setup_req(conn, &msg, rc);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 case MNCC_SETUP_RSP:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 case MNCC_SETUP_COMPL_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 case MNCC_CALL_PROC_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 case MNCC_PROGRESS_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 case MNCC_ALERT_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 case MNCC_NOTIFY_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 case MNCC_DISC_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 case MNCC_REL_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 case MNCC_FACILITY_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 case MNCC_START_DTMF_RSP:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 case MNCC_START_DTMF_REJ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 case MNCC_STOP_DTMF_RSP:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 case MNCC_MODIFY_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 case MNCC_MODIFY_RSP:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 case MNCC_MODIFY_REJ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 case MNCC_HOLD_CNF:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 case MNCC_HOLD_REJ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 case MNCC_RETRIEVE_CNF:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 case MNCC_RETRIEVE_REJ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 case MNCC_USERINFO_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 case MNCC_REJ_REQ:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 handle_signaling_msg(conn, &msg, rc);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 case MNCC_RTP_CREATE:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 case MNCC_RTP_CONNECT:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 case MNCC_RTP_FREE:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 handle_rtp_msg(conn, &msg, rc);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 return;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 default:
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 syslog(LOG_CRIT,
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 "unknown MNCC message type 0x%x from ThemWi call socket",
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 msg.msg_type);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 mncc_signal_to_socket(call, msg)
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 struct gsm_call *call;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 struct gsm_mncc *msg;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 {
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 msg->callref = call->socket_ref;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 return send(call->socket->fd, msg, sizeof(struct gsm_mncc), 0);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 mncc_signal_to_socket_nocall(conn, msg)
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 struct socket_conn *conn;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 struct gsm_mncc *msg;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 {
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 return send(conn->fd, msg, sizeof(struct gsm_mncc), 0);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 mncc_rtp_to_socket(call, msg)
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 struct gsm_call *call;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239 struct gsm_mncc_rtp *msg;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 {
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 msg->callref = call->socket_ref;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 return send(call->socket->fd, msg, sizeof(struct gsm_mncc_rtp), 0);
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 }