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annotate mncc/outcall.c @ 2:053f04687106

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mncc: initial import from old ThemWi
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 08 Jun 2024 23:12:12 +0000
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053f04687106 mncc: initial import from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * In this module we handle routing of outbound MO calls
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Mychaela Falconia <falcon@freecalypso.org>
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3 * to the outcall socket provided by themwi-sip-out.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <sys/un.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 <unistd.h>
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16 #include "../include/mncc.h"
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17 #include "../include/gsm48_const.h"
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18 #include "struct.h"
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19
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20 extern struct socket_conn outcall_conn;
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21
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22 static char outcall_socket_pathname[] = "/var/gsm/outcall_socket";
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23
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24 connect_outcall_socket()
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25 {
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26 struct sockaddr_un sa;
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27 unsigned sa_len;
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28 int fd, rc;
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29
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30 if (outcall_conn.fd >= 0)
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31 return(0);
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32 fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
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33 if (fd < 0) {
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34 syslog(LOG_CRIT, "socket(AF_UNIX, SOCK_SEQPACKET, 0): %m");
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35 return(-1);
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36 }
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37 fill_sockaddr_un(outcall_socket_pathname, &sa, &sa_len);
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38 rc = connect(fd, (struct sockaddr *) &sa, sa_len);
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39 if (rc < 0) {
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40 syslog(LOG_ERR, "connect to %s: %m", outcall_socket_pathname);
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41 close(fd);
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42 return(-1);
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43 }
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44 update_max_fd(fd);
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45 outcall_conn.fd = fd;
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46 return(0);
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47 }
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48
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49 void
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50 outbound_mo_setup(call, msg)
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51 struct gsm_call *call;
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52 struct gsm_mncc *msg;
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53 {
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54 int rc;
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55
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56 rc = connect_outcall_socket();
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57 if (rc < 0) {
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58 syslog(LOG_ERR, "rejecting MO call 0x%x: outbound gateway down",
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59 msg->callref);
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60 reject_mo_call(msg->callref, GSM48_CAUSE_LOC_PRN_S_LU,
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61 GSM48_CC_CAUSE_DEST_OOO);
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62 call->gc_flag = 1;
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63 return;
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64 }
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65 call->socket = &outcall_conn;
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66 call->socket_ref = msg->callref;
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67 outcall_conn.ncalls++;
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68 mncc_signal_to_socket(call, msg);
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69 }