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annotate sip-out/e911.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 9f96e5b14755
children
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9f96e5b14755 sip-out: implement E911 special handling
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1 /*
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2 * In this module we implement E911 routing, i.e., special handling
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3 * for calls to either the real 911 or E911 test numbers.
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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 <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include <syslog.h>
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14 #include "../include/mncc.h"
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15 #include "../include/gsm48_const.h"
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16 #include "../include/number_db_v2.h"
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17 #include "../libnumdb2/lookup_func.h"
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18
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19 e911_call_preen(msg)
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20 struct gsm_mncc *msg;
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21 {
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22 struct owned_number_rec *nr;
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23
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24 syslog(LOG_NOTICE, "E911 call attempt from %s to %s, emergency flag %d",
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25 msg->calling.number, msg->called.number, msg->emergency);
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26 refresh_number_db();
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27 nr = numdb_lookup_nanp(msg->calling.number+1);
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28 if (!nr) {
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29 syslog(LOG_NOTICE,
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30 "E911 call rejected: calling number is not in database");
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31 return 0;
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32 }
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33 if (nr->number_flags & NUMBER_FLAG_E911PROV) {
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34 syslog(LOG_NOTICE,
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35 "E911 call allowed: calling number has E911 flag set");
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36 return 1;
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37 }
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38 if (nr->usage & NUMBER_USAGE_FLAG_E911_VIA) {
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39 sprintf(msg->calling.number, "1%03u%03u%04u",
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40 nr->remap[0], nr->remap[1], nr->remap[2]);
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41 syslog(LOG_NOTICE, "E911 call: source number changed to %s",
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42 msg->calling.number);
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43 return 1;
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44 }
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45 syslog(LOG_NOTICE,
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46 "E911 call rejected: calling number is not E911-provisioned");
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47 return 0;
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48 }