FreeCalypso > hg > themwi-system-sw

annotate mncc/extsock.c @ 27:c6572f4c31d2

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themwi-mncc: fix bug in forwarding from call socket to GSM
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 28 Jun 2022 19:21:51 -0800
parents ccc5ab6d8388
children 660126bd5f59
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15
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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 void
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21 extsock_dec_refcount(conn)
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22 struct socket_conn *conn;
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23 {
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24 if (!conn->ncalls) {
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25 syslog(LOG_CRIT, "FATAL BUG: ncalls=0 on socket call clearing");
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26 exit(1);
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27 }
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28 conn->ncalls--;
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29 }
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30
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31 static void
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32 send_rel_on_broken_socket(call)
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33 struct gsm_call *call;
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34 {
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35 struct gsm_mncc msg;
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36
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37 bzero(&msg, sizeof(struct gsm_mncc));
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38 msg.msg_type = MNCC_REL_REQ;
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39 msg.callref = call->callref;
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40 mncc_set_cause(&msg, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_DEST_OOO);
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41 send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc));
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42 }
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43
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44 static void
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45 broken_socket_clear_calls(conn)
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46 struct socket_conn *conn;
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47 {
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48 extern struct gsm_call *call_list_head;
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49 struct gsm_call *call;
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50
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51 for (call = call_list_head; call; call = call->next) {
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52 if (call->gc_flag)
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53 continue;
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54 if (call->socket == conn) {
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55 send_rel_on_broken_socket(call);
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56 extsock_dec_refcount(conn);
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57 call->gc_flag = 1;
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58 }
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59 }
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60 if (conn->ncalls) {
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61 syslog(LOG_CRIT,
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62 "FATAL BUG: ncalls!=0 after broken socket call clearing");
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63 exit(1);
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64 }
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65 }
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66
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67 static void
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68 report_runt(msg)
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69 union mncc_msg *msg;
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70 {
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71 syslog(LOG_CRIT,
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72 "MNCC message type 0x%x from ThemWi call socket is too short!",
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73 msg->msg_type);
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74 }
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75
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76 static void
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77 handle_setup_req(conn, msg, msglen)
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78 struct socket_conn *conn;
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79 struct gsm_mncc *msg;
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80 unsigned msglen;
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81 {
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82 struct gsm_call *call;
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83
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84 if (msglen < sizeof(struct gsm_mncc)) {
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85 report_runt(msg);
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86 return;
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87 }
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88 call = find_socket_call(conn, msg->callref);
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89 if (call) {
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90 syslog(LOG_ERR,
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91 "duplicate MNCC_SETUP_REQ from socket for callref 0x%x",
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92 msg->callref);
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93 /* drop it like OsmoMSC's mncc_builtin does */
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94 return;
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95 }
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96 /* further processing */
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97 process_ext_mtcall_setup(conn, msg);
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98 }
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99
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100 static void
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101 handle_signaling_msg(conn, msg, msglen)
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102 struct socket_conn *conn;
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103 struct gsm_mncc *msg;
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104 unsigned msglen;
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105 {
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106 struct gsm_call *call;
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107
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108 if (msglen < sizeof(struct gsm_mncc)) {
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109 report_runt(msg);
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110 return;
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111 }
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112 call = find_socket_call(conn, msg->callref);
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113 if (!call) {
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114 syslog(LOG_ERR,
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115 "MNCC message from ThemWi call socket: callref 0x%x not found",
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116 msg->callref);
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117 /* drop it like OsmoMSC's mncc_builtin does */
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118 return;
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119 }
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120 /* forward to GSM MNCC interface */
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121 msg->callref = call->callref;
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122 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc));
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123 if (msg->msg_type == MNCC_REJ_REQ) {
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124 extsock_dec_refcount(conn);
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125 call->gc_flag = 1;
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126 }
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127 }
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128
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129 static void
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130 handle_rtp_msg(conn, msg, msglen)
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diff changeset
131 struct socket_conn *conn;
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parents:
diff changeset
132 struct gsm_mncc_rtp *msg;
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parents:
diff changeset
133 unsigned msglen;
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parents:
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134 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 struct gsm_call *call;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136
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parents:
diff changeset
137 if (msglen < sizeof(struct gsm_mncc_rtp)) {
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parents:
diff changeset
138 report_runt(msg);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 call = find_socket_call(conn, msg->callref);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 if (!call) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 syslog(LOG_ERR,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 "MNCC message from ThemWi call socket: callref 0x%x not found",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 msg->callref);
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
146 /* drop it like OsmoMSC's mncc_builtin does */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 }
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Mychaela Falconia <falcon@freecalypso.org>
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149 /* forward to GSM MNCC interface */
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
150 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
151 send_mncc_to_gsm(msg, sizeof(struct gsm_mncc_rtp));
15
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152 }
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153
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Mychaela Falconia <falcon@freecalypso.org>
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154 void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 extsock_read_select(conn)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 struct socket_conn *conn;
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Mychaela Falconia <falcon@freecalypso.org>
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157 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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158 union mncc_msg msg;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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159 int rc;
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Mychaela Falconia <falcon@freecalypso.org>
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160
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161 rc = recv(conn->fd, &msg, sizeof msg, 0);
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parents:
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162 if (rc < 4) {
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parents:
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163 if (conn->ncalls)
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164 broken_socket_clear_calls(conn);
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parents:
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165 close(conn->fd);
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parents:
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166 conn->fd = -1;
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parents:
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167 return;
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parents:
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168 }
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parents:
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169 switch (msg.msg_type) {
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parents:
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170 case MNCC_SETUP_REQ:
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parents:
diff changeset
171 handle_setup_req(conn, &msg, rc);
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parents:
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172 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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173 case MNCC_SETUP_RSP:
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parents:
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174 case MNCC_SETUP_COMPL_REQ:
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parents:
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175 case MNCC_CALL_PROC_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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176 case MNCC_PROGRESS_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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177 case MNCC_ALERT_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
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178 case MNCC_NOTIFY_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
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179 case MNCC_DISC_REQ:
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parents:
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180 case MNCC_REL_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 case MNCC_FACILITY_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 case MNCC_START_DTMF_RSP:
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parents:
diff changeset
183 case MNCC_START_DTMF_REJ:
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parents:
diff changeset
184 case MNCC_STOP_DTMF_RSP:
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parents:
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185 case MNCC_MODIFY_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 case MNCC_MODIFY_RSP:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 case MNCC_MODIFY_REJ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 case MNCC_HOLD_CNF:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 case MNCC_HOLD_REJ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 case MNCC_RETRIEVE_CNF:
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parents:
diff changeset
191 case MNCC_RETRIEVE_REJ:
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parents:
diff changeset
192 case MNCC_USERINFO_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 case MNCC_REJ_REQ:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 handle_signaling_msg(conn, &msg, rc);
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parents:
diff changeset
195 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 case MNCC_RTP_CREATE:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 case MNCC_RTP_CONNECT:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 case MNCC_RTP_FREE:
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parents:
diff changeset
199 handle_rtp_msg(conn, &msg, rc);
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parents:
diff changeset
200 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 default:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 syslog(LOG_CRIT,
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 "unknown MNCC message type 0x%x from ThemWi call socket",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 msg.msg_type);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 mncc_signal_to_socket(call, msg)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 struct gsm_call *call;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 struct gsm_mncc *msg;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 {
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 msg->callref = call->socket_ref;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 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
214 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 mncc_signal_to_socket_nocall(conn, msg)
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 struct socket_conn *conn;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 struct gsm_mncc *msg;
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 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
221 }
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 mncc_rtp_to_socket(call, msg)
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 struct gsm_call *call;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 struct gsm_mncc_rtp *msg;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 {
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 msg->callref = call->socket_ref;
ccc5ab6d8388 first version of themwi-mncc for ThemWi2
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 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
229 }