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enumroute.cpp
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enumroute.cpp
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/**
* enumroute.cpp
* This file is part of the YATE Project https://YATE.null.ro
*
* ENUM routing module
*
* Yet Another Telephony Engine - a fully featured software PBX and IVR
* Copyright (C) 2004-2019 Null Team
*
* This software is distributed under multiple licenses;
* see the COPYING file in the main directory for licensing
* information for this specific distribution.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <yatephone.h>
using namespace TelEngine;
namespace { // anonymous
#define ENUM_DEF_TIMEOUT 3
#define ENUM_DEF_RETRIES 2
#define ENUM_DEF_MINLEN 8
#define ENUM_DEF_MAXCALL 30000
class EnumModule : public Module
{
public:
inline EnumModule()
: Module("enumroute","route"), m_init(false)
{ }
virtual void initialize();
virtual void statusParams(String& str);
void genUpdate(Message& msg);
private:
bool m_init;
};
static String s_prefix;
static String s_forkStop;
static String s_domains;
static unsigned int s_minlen;
static int s_timeout;
static int s_retries;
static int s_maxcall;
static bool s_success;
static bool s_redirect;
static bool s_autoFork;
static bool s_sipUsed;
static bool s_iaxUsed;
static bool s_h323Used;
static bool s_xmppUsed;
static bool s_telUsed;
static bool s_voiceUsed;
static bool s_pstnUsed;
static bool s_voidUsed;
static Mutex s_mutex(false,"EnumRoute");
static int s_queries = 0;
static int s_routed = 0;
static int s_reroute = 0;
static EnumModule emodule;
class EnumHandler : public MessageHandler
{
public:
inline EnumHandler(unsigned int prio = 90)
: MessageHandler("call.route",prio,emodule.name())
{ }
virtual bool received(Message& msg);
private:
static bool resolve(Message& msg,bool canRedirect,const ObjList* domains);
static void addRoute(String& dest,const String& src);
};
// Routing message handler, performs checks and calls resolve method
bool EnumHandler::received(Message& msg)
{
if (!msg.getBoolValue(YSTRING("enumroute"),true))
return false;
// perform per-thread initialization of resolver and timeout settings
if (!Resolver::init(s_timeout,s_retries))
return false;
const String* d = msg.getParam(YSTRING("enum_domains"));
s_mutex.lock();
if (!d)
d = &s_domains;
ObjList* domains = d->split(',',false);
s_mutex.unlock();
bool ok = domains && resolve(msg,s_telUsed,domains);
TelEngine::destruct(domains);
// return false to allow further routing if configured or asked so
if (ok && !msg.getBoolValue(YSTRING("enum_success"),s_success)) {
msg.setParam("success_enum",String::boolText(true));
ok = false;
}
return ok;
}
// Resolver function, may call itself recursively at most once
bool EnumHandler::resolve(Message& msg,bool canRedirect,const ObjList* domains)
{
// give preference to full (e164) called number if exists
String called(msg.getValue("calledfull"));
if (called.null())
called = msg.getValue("called");
if (called.null())
return false;
// check if the called starts with international prefix, remove it
if (!(called.startSkip("+",false) ||
(s_prefix && called.startSkip(s_prefix,false))))
return false;
if (called.length() < s_minlen)
return false;
bool rval = false;
// put the standard international prefix in front
called = "+" + called;
String tmp;
for (int i = called.length()-1; i > 0; i--)
tmp << called.at(i) << ".";
u_int64_t dt = Time::now();
ObjList res;
for (const ObjList* l = domains; l; l = l->next()) {
const String* s = static_cast<const String*>(l->get());
if (!s || s->null())
continue;
int result = Resolver::naptrQuery(tmp + *s,res);
if ((result == 0) && res.skipNull())
break;
}
dt = Time::now() - dt;
Debug(&emodule,DebugInfo,"Returned %d NAPTR records in %u.%06u s",
res.count(),(unsigned int)(dt / 1000000),(unsigned int)(dt % 1000000));
bool reroute = false;
bool unassigned = false;
if (res.skipNull()) {
msg.retValue().clear();
bool autoFork = msg.getBoolValue("autofork",s_autoFork);
for (ObjList* cur = res.skipNull(); cur; cur = cur->skipNext()) {
NaptrRecord* ptr = static_cast<NaptrRecord*>(cur->get());
DDebug(&emodule,DebugAll,"order=%d pref=%d '%s'",
ptr->order(),ptr->pref(),ptr->serv().c_str());
String serv = ptr->serv();
serv.toUpper();
String callto = called;
if (s_sipUsed && (serv == "E2U+SIP") && ptr->replace(callto)) {
addRoute(msg.retValue(),"sip/" + callto);
rval = true;
if (autoFork)
continue;
break;
}
if (s_iaxUsed && (serv == "E2U+IAX2") && ptr->replace(callto)) {
addRoute(msg.retValue(),"iax/" + callto);
rval = true;
if (autoFork)
continue;
break;
}
if (s_h323Used && (serv == "E2U+H323") && ptr->replace(callto)) {
addRoute(msg.retValue(),"h323/" + callto);
rval = true;
if (autoFork)
continue;
break;
}
if (s_xmppUsed && (serv == "E2U+XMPP") && ptr->replace(callto)) {
addRoute(msg.retValue(),"jingle/" + callto);
rval = true;
if (autoFork)
continue;
break;
}
if (s_pstnUsed && serv.startsWith("E2U+PSTN") && ptr->replace(callto)) {
addRoute(msg.retValue(),"pstn/" + callto);
rval = true;
if (autoFork)
continue;
break;
}
if (s_voiceUsed && serv.startsWith("E2U+VOICE") && ptr->replace(callto)) {
addRoute(msg.retValue(),"voice/" + callto);
rval = true;
if (autoFork)
continue;
break;
}
if (canRedirect && (serv == "E2U+TEL") && ptr->replace(callto)) {
if (callto.startSkip("tel:",false) ||
callto.startSkip("TEL:",false) ||
callto.startSkip("e164:",false) ||
callto.startSkip("E164:",false))
{
reroute = true;
rval = false;
msg.setParam("called",callto);
msg.clearParam("calledfull");
if (msg.retValue()) {
Debug(&emodule,DebugMild,"Redirect drops collected route: %s",
msg.retValue().c_str());
msg.retValue().clear();
}
break;
}
continue;
}
if (s_voidUsed && serv.startsWith("E2U+VOID") && ptr->replace(callto)) {
// remember it's unassigned but still continue scanning
unassigned = true;
}
}
}
s_mutex.lock();
if (rval) {
if (msg.retValue().startsWith("fork",true)) {
msg.setParam("maxcall",String(s_maxcall));
msg.setParam("fork.stop",s_forkStop);
}
else if (s_redirect)
msg.setParam("redirect",String::boolText(true));
}
s_queries++;
if (rval)
s_routed++;
if (reroute)
s_reroute++;
emodule.changed();
s_mutex.unlock();
if (reroute)
return resolve(msg,false,domains);
if (unassigned && !rval) {
rval = true;
msg.retValue() = "-";
msg.setParam("error","unallocated");
}
return rval;
}
// Add one route to the result, take care of forking
void EnumHandler::addRoute(String& dest,const String& src)
{
if (dest.null())
dest = src;
else {
if (!dest.startsWith("fork",true))
dest = "fork " + dest;
dest << " | " << src;
}
}
void EnumModule::statusParams(String& str)
{
str.append("queries=",",") << s_queries << ",routed=" << s_routed << ",rerouted=" << s_reroute;
}
void EnumModule::genUpdate(Message& msg)
{
msg.setParam("queries",String(s_queries));
msg.setParam("routed",String(s_routed));
msg.setParam("rerouted",String(s_reroute));
}
void EnumModule::initialize()
{
Module::initialize();
Configuration cfg(Engine::configFile("enumroute"));
int prio = cfg.getIntValue("general","priority",0);
if ((prio <= 0) && !m_init)
return;
Output("Initializing ENUM routing");
s_mutex.lock();
// in most of the world this default international prefix should work
s_prefix = cfg.getValue("general","prefix","00");
s_domains = cfg.getValue("general","domains");
if (s_domains.null()) {
// old style, just for compatibility
s_domains = cfg.getValue("general","domain","e164.arpa");
s_domains.append(cfg.getValue("general","backup","e164.org"),",");
}
s_forkStop = cfg.getValue("general","forkstop","busy");
s_mutex.unlock();
DDebug(&emodule,DebugInfo,"Domain list: %s",s_domains.c_str());
s_minlen = cfg.getIntValue("general","minlen",ENUM_DEF_MINLEN);
int tmp = cfg.getIntValue("general","timeout",ENUM_DEF_TIMEOUT);
// limit between 1 and 10 seconds
if (tmp < 1)
tmp = 1;
if (tmp > 10)
tmp = 10;
s_timeout = tmp;
tmp = cfg.getIntValue("general","retries",ENUM_DEF_RETRIES);
// limit between 1 and 5 retries
if (tmp < 1)
tmp = 1;
if (tmp > 5)
tmp = 5;
s_retries = tmp;
// overall a resolve attempt will take at most 50s per domain
tmp = cfg.getIntValue("general","maxcall",ENUM_DEF_MAXCALL);
// limit between 2 and 120 seconds
if (tmp < 2000)
tmp = 2000;
if (tmp > 120000)
tmp = 120000;
s_maxcall = tmp;
s_success = cfg.getBoolValue("general","success",true);
s_redirect = cfg.getBoolValue("general","redirect");
s_autoFork = cfg.getBoolValue("general","autofork");
s_sipUsed = cfg.getBoolValue("protocols","sip",true);
s_iaxUsed = cfg.getBoolValue("protocols","iax",true);
s_h323Used = cfg.getBoolValue("protocols","h323",true);
s_xmppUsed = cfg.getBoolValue("protocols","jingle",true);
s_voidUsed = cfg.getBoolValue("protocols","void",true);
// by default don't support the number rerouting
s_telUsed = cfg.getBoolValue("protocols","tel",false);
// also don't enable gateways by default as more setup is needed
s_pstnUsed = cfg.getBoolValue("protocols","pstn",false);
s_voiceUsed= cfg.getBoolValue("protocols","voice",false);
if (m_init || (prio <= 0))
return;
m_init = true;
if (Resolver::available(Resolver::Naptr))
Engine::install(new EnumHandler(cfg.getIntValue("general","priority",prio)));
else
Debug(&emodule,DebugCrit,"NAPTR resolver is not available on this platform");
}
}; // anonymous namespace
/* vi: set ts=8 sw=4 sts=4 noet: */