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Routing.cxx
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Routing.cxx
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//////////////////////////////////////////////////////////////////
//
// Routing Mechanism for GNU Gatekeeper
//
// Copyright (c) Citron Network Inc. 2003
// Copyright (c) 2004-2021, Jan Willamowius
//
// This work is published under the GNU Public License version 2 (GPLv2)
// see file COPYING for details.
// We also explicitly grant the right to link this code
// with the OpenH323/H323Plus and OpenSSL library.
//
//////////////////////////////////////////////////////////////////
#include "config.h"
#include <ptlib.h>
#include <ptclib/enum.h>
#include <h323pdu.h>
#include "gk_const.h"
#include "h323util.h"
#include "Toolkit.h"
#include "RasTbl.h"
#include "RasSrv.h"
#include "GkClient.h"
#include "GkStatus.h"
#include "sigmsg.h"
#include "Routing.h"
#include "gksql.h"
#include "gkauth.h" // for reusing GkAuthenticator::ReplaceAuthParams()
#ifdef HAS_H46023
#include <h460/h4601.h>
#endif
#include <ptclib/http.h>
#ifdef HAS_LIBCURL
#include <curl/curl.h>
#endif // HAS_LIBCURL
using std::string;
using std::vector;
using std::list;
using std::stable_sort;
using std::binary_function;
namespace Routing {
const char *SectionName[] = {
"RoutingPolicy::OnARQ",
"RoutingPolicy::OnLRQ",
"RoutingPolicy::OnSetup",
"RoutingPolicy::OnFacility",
"RoutingPolicy"
};
const unsigned DEFAULT_ROUTE_PRIORITY = 1;
const long DEFAULT_ROUTE_REQUEST_TIMEOUT = 10;
const char* const CTIsection = "CTI::Agents";
Route::Route() : m_proxyMode(CallRec::ProxyDetect), m_flags(0), m_useTLS(false), m_priority(DEFAULT_ROUTE_PRIORITY)
{
m_destAddr.SetTag(H225_TransportAddress::e_nonStandardAddress); // set to an invalid address
Toolkit::Instance()->SetRerouteCauses(m_rerouteCauses);
}
Route::Route(
const PString & policyName,
const endptr & destEndpoint,
unsigned priority
) : m_destAddr(destEndpoint ? destEndpoint->GetCallSignalAddress() : H225_TransportAddress()), m_destEndpoint(destEndpoint), m_policy(policyName),
m_proxyMode(CallRec::ProxyDetect), m_flags(0), m_useTLS(false), m_priority(priority)
{
Toolkit::Instance()->SetRerouteCauses(m_rerouteCauses);
if (!destEndpoint) {
PTRACE(1, "Error: Route created with NULL endpoint!");
SNMP_TRAP(7, SNMPWarning, General, "Route created with NULL endpoint");
}
}
Route::Route(
const PString & policyName,
const H225_TransportAddress & destAddr,
unsigned priority
) : m_destAddr(destAddr), m_policy(policyName), m_proxyMode(CallRec::ProxyDetect), m_flags(0), m_useTLS(false), m_priority(priority)
{
Toolkit::Instance()->SetRerouteCauses(m_rerouteCauses);
}
Route::Route(
const PString & policyName,
const PIPSocket::Address & destIpAddr,
WORD destPort,
unsigned priority
) : m_destAddr(SocketToH225TransportAddr(destIpAddr, destPort)),
m_policy(policyName), m_proxyMode(CallRec::ProxyDetect), m_flags(0), m_useTLS(false), m_priority(priority)
{
Toolkit::Instance()->SetRerouteCauses(m_rerouteCauses);
}
PString Route::AsString() const
{
return AsDotString(m_destAddr) + " (policy: " + m_policy + ", proxy: "
+ PString(m_proxyMode) + ", flags: " + PString(m_flags) + ", Called-Station-Id: " + m_destNumber
+ ", Called-Station-Id-Out: " + m_destOutNumber + ", priority: " + PString(m_priority) + ")";
}
bool Route::IsFailoverActive(
unsigned cause
) const
{
cause = cause & 0x7f;
return m_rerouteCauses[cause >> 3] & (1UL << (cause & 7));
}
bool Route::SetLanguages(const PStringList & local, const PStringList & remote)
{
if (local.GetSize() == 0 && remote.GetSize() == 0)
return true;
for (PINDEX i = 0; i < local.GetSize(); ++i) {
for (PINDEX j = 0; j < remote.GetSize(); ++j) {
if (local[i] == remote[j])
m_language.AppendString(local[i]);
}
}
return (m_language.GetSize() > 0);
}
// class RoutingRequest
RoutingRequest::RoutingRequest()
: m_reason(-1), m_flags(0), m_hasNewSetupAliases(false)
{
}
RoutingRequest::RoutingRequest(
const std::list<Route> &failedRoutes
)
: m_reason(-1), m_flags(0), m_failedRoutes(failedRoutes), m_hasNewSetupAliases(false)
{
}
RoutingRequest::~RoutingRequest()
{
}
bool RoutingRequest::AddRoute(const Route & route)
{
PIPSocket::Address addr;
WORD port;
if (!(route.m_destAddr.IsValid() && GetIPAndPortFromTransportAddr(route.m_destAddr, addr, port)
&& addr.IsValid() && port != 0)) {
PTRACE(1, "ROUTING\tInvalid destination address: " << AsString(route.m_destAddr));
return false;
}
list<Route>::const_iterator i = m_failedRoutes.begin();
while (i != m_failedRoutes.end()) {
if (i->m_destAddr == route.m_destAddr && i->m_policy == route.m_policy
&& i->m_routeId == route.m_routeId) {
PTRACE(5, "ROUTING\tSkipping failed route " << route.AsString());
return true;
}
++i;
}
m_routes.push_back(route);
m_routes.sort(); // put routes in priority order
return true;
}
bool RoutingRequest::GetFirstRoute(Route & route)
{
if (m_routes.empty())
return false;
route = *m_routes.begin();
return true;
}
void RoutingRequest::RemoveAllRoutes()
{
m_routes.clear();
}
bool RoutingRequest::GetGatewayDestination(H225_TransportAddress & gw) const
{
PIPSocket::Address addr;
if (!GetIPFromTransportAddr(m_gwDestination, addr)||!addr.IsValid())
return false;
gw = m_gwDestination;
return true;
}
bool RoutingRequest::SupportLanguages() const
{
#ifdef HAS_LANGUAGE
return GkConfig()->GetBoolean("RasSrv::LRQFeatures", "EnableLanguageRouting", false);
#else
return false;
#endif
}
// class AdmissionRequest
template<> H225_ArrayOf_AliasAddress *AdmissionRequest::GetAliases()
{
return (m_request.HasOptionalField(H225_AdmissionRequest::e_destinationInfo) && m_request.m_destinationInfo.GetSize() > 0)
? &m_request.m_destinationInfo : NULL;
}
template<> void AdmissionRequest::SetAliases(H225_ArrayOf_AliasAddress & aliases)
{
m_request.IncludeOptionalField(H225_AdmissionRequest::e_destinationInfo);
m_request.m_destinationInfo = aliases;
}
template<> const H225_TransportAddress *AdmissionRequest::GetDestIP() const
{
return (m_request.HasOptionalField(H225_AdmissionRequest::e_destCallSignalAddress))
? &m_request.m_destCallSignalAddress : NULL;
}
// class LocationRequest
template<> H225_ArrayOf_AliasAddress *LocationRequest::GetAliases()
{
return (m_request.m_destinationInfo.GetSize() > 0)
? &m_request.m_destinationInfo : NULL;
}
template<> const H225_TransportAddress *LocationRequest::GetDestIP() const
{
return NULL; // TODO: check if one alias is transportID or h323ID that matches IP number ?
}
// class SetupRequest
template<> H225_ArrayOf_AliasAddress *SetupRequest::GetAliases()
{
return (m_request.HasOptionalField(H225_Setup_UUIE::e_destinationAddress) && m_request.m_destinationAddress.GetSize() > 0)
? &m_request.m_destinationAddress : NULL;
}
template<> const H225_TransportAddress *SetupRequest::GetDestIP() const
{
return (m_request.HasOptionalField(H225_Setup_UUIE::e_destCallSignalAddress))
? &m_request.m_destCallSignalAddress : NULL;
}
// class FacilityRequest
template<> H225_ArrayOf_AliasAddress *FacilityRequest::GetAliases()
{
return (m_request.HasOptionalField(H225_Facility_UUIE::e_alternativeAliasAddress) && m_request.m_alternativeAliasAddress.GetSize() > 0)
? &m_request.m_alternativeAliasAddress : NULL;
}
template<> const H225_TransportAddress *FacilityRequest::GetDestIP() const
{
return (m_request.HasOptionalField(H225_Facility_UUIE::e_alternativeAddress))
? &m_request.m_alternativeAddress : NULL;
}
bool Policy::Handle(SetupRequest & request)
{
if (IsActive()) {
const PString tagname = request.GetWrapper()->GetTagName();
const unsigned crv = request.GetWrapper()->GetCallReference();
PTRACE(5, "ROUTING\tChecking policy " << m_name
<< " for request " << tagname << " CRV=" << crv);
if (OnRequest(request)) {
PTRACE(5, "ROUTING\tPolicy " << m_name
<< " applied to the request " << tagname << " CRV=" << crv);
return true;
}
}
return m_next && m_next->Handle(request);
}
bool Policy::Handle(FacilityRequest& request)
{
if (IsActive()) {
const PString tagname = request.GetWrapper()->GetTagName();
const unsigned crv = request.GetWrapper()->GetCallReference();
PTRACE(5, "ROUTING\tChecking policy " << m_name
<< " for request " << tagname << " CRV=" << crv
);
if (OnRequest(request)) {
PTRACE(5, "ROUTING\tPolicy " << m_name
<< " applied to the request " << tagname << " CRV=" << crv);
return true;
}
}
return m_next && m_next->Handle(request);
}
void Policy::SetInstance(const PString & instance)
{
PString policyName = PString(m_name);
if (!instance.IsEmpty()) {
m_instance = instance;
policyName = policyName + "::" + m_instance;
m_name = *(PString *)policyName.Clone();
}
m_iniSection = "Routing::" + policyName;
LoadConfig(instance);
}
// class Analyzer
Analyzer::Analyzer() : Singleton<Analyzer>("Routing::Analyzer")
{
// OnReload is called by holder
}
Analyzer::~Analyzer()
{
WriteLock lock(m_reloadMutex);
for (int i = 0; i < 4; ++i)
DeleteObjectsInMap(m_rules[i]);
}
void Analyzer::OnReload()
{
WriteLock lock(m_reloadMutex);
for (int i = 0; i < 4; ++i) {
Rules & rules = m_rules[i];
DeleteObjectsInMap(rules);
rules.clear();
PStringToString cfgs(GkConfig()->GetAllKeyValues(SectionName[i]));
if (cfgs.GetSize() == 0) // no such a section? try default
cfgs = GkConfig()->GetAllKeyValues(SectionName[4]);
for (PINDEX j = 0; j < cfgs.GetSize(); ++j) {
PString prefix = cfgs.GetKeyAt(j);
if (prefix *= "default")
prefix = "*";
PStringArray prefixes(prefix.Tokenise(",;|", false));
for (PINDEX k = 0; k < prefixes.GetSize(); ++k)
rules[prefixes[k]] = Create(cfgs.GetDataAt(j).Trim());
PTRACE(1, SectionName[i] << " add policy " << cfgs.GetDataAt(j) << " for prefix " << prefix);
}
// default policy for backward compatibility
if (rules.empty())
rules["*"] = Create("explicit,internal,parent,neighbor");
}
}
bool Analyzer::Parse(AdmissionRequest & request)
{
ReadLock lock(m_reloadMutex);
request.SetRejectReason(H225_AdmissionRejectReason::e_calledPartyNotRegistered);
Policy *policy = ChoosePolicy(request.GetAliases(), m_rules[0]);
bool policyApplied = policy ? policy->HandleRas(request) : false;
if (!policyApplied && request.HasRoutes()) {
Route fallback;
request.GetFirstRoute(fallback);
const char * tagname = request.GetWrapper()
? request.GetWrapper()->GetTagName() : "unknown";
const unsigned seqnum = request.GetRequest().m_requestSeqNum.GetValue();
PTRACE(5, "ROUTING\t" << fallback.m_policy
<< " applied as fallback to the request " << tagname << ' ' << seqnum);
}
return policyApplied || request.HasRoutes();
}
bool Analyzer::Parse(LocationRequest & request)
{
ReadLock lock(m_reloadMutex);
request.SetRejectReason(H225_LocationRejectReason::e_requestDenied);
Policy *policy = ChoosePolicy(request.GetAliases(), m_rules[1]);
bool policyApplied = policy ? policy->HandleRas(request) : false;
if (!policyApplied && request.HasRoutes()) {
Route fallback;
request.GetFirstRoute(fallback);
const char * tagname = request.GetWrapper()
? request.GetWrapper()->GetTagName() : "unknown";
const unsigned seqnum = request.GetRequest().m_requestSeqNum.GetValue();
PTRACE(5, "ROUTING\t" << fallback.m_policy
<< " applied as fallback to the request " << tagname << ' ' << seqnum);
}
return policyApplied || request.HasRoutes();
}
bool Analyzer::Parse(SetupRequest & request)
{
ReadLock lock(m_reloadMutex);
request.SetRejectReason(H225_ReleaseCompleteReason::e_calledPartyNotRegistered);
Policy * policy = ChoosePolicy(request.GetAliases(), m_rules[2]);
bool policyApplied = policy ? policy->Handle(request) : false;
if (!policyApplied && request.HasRoutes()) {
Route fallback;
request.GetFirstRoute(fallback);
const PString tagname = request.GetWrapper()->GetTagName();
const unsigned crv = request.GetWrapper()->GetCallReference();
PTRACE(5, "ROUTING\t" << fallback.m_policy
<< " applied as fallback to the request " << tagname << " CRV=" << crv);
}
return policyApplied || request.HasRoutes();
}
bool Analyzer::Parse(FacilityRequest & request)
{
ReadLock lock(m_reloadMutex);
request.SetRejectReason(H225_ReleaseCompleteReason::e_calledPartyNotRegistered);
Policy *policy = ChoosePolicy(request.GetAliases(), m_rules[3]);
bool policyApplied = policy ? policy->Handle(request) : false;
if (!policyApplied && request.HasRoutes()) {
Route fallback;
request.GetFirstRoute(fallback);
const PString tagname = request.GetWrapper()->GetTagName();
const unsigned crv = request.GetWrapper()->GetCallReference();
PTRACE(5, "ROUTING\t" << fallback.m_policy
<< " applied as fallback to the request " << tagname << " CRV=" << crv);
}
return policyApplied || request.HasRoutes();
}
Policy *Analyzer::Create(const PString & cfg)
{
return Policy::Create(cfg.ToLower().Tokenise(",;|", false));
}
Policy *Analyzer::ChoosePolicy(const H225_ArrayOf_AliasAddress *aliases, Rules & rules)
{
// safeguard if we don't have any rules (eg. not yet initialized on startup)
if (rules.empty())
return NULL;
// use rules.begin() as the default policy
// since "*" has the minimum key value
Rules::iterator iter = rules.begin();
if (aliases && aliases->GetSize() > 0) {
for (PINDEX i = 0; i < aliases->GetSize(); ++i) {
const H225_AliasAddress & alias = (*aliases)[i];
iter = rules.find(alias.GetTagName());
if (iter != rules.end())
break;
PString destination(AsString(alias, false));
while (iter != rules.begin()) {
--iter; // search in reverse order
if (MatchPrefix(destination, iter->first) > 0)
return iter->second;
}
}
}
return iter->second;
}
// class AliasesPolicy
bool AliasesPolicy::OnRequest(AdmissionRequest & request)
{
H225_ArrayOf_AliasAddress *aliases = request.GetAliases();
return aliases && FindByAliases(request, *aliases);
}
bool AliasesPolicy::OnRequest(LocationRequest & request)
{
H225_ArrayOf_AliasAddress *aliases = request.GetAliases();
return aliases && FindByAliases(request, *aliases);
}
bool AliasesPolicy::OnRequest(SetupRequest & request)
{
H225_ArrayOf_AliasAddress *aliases = request.GetAliases();
return aliases && FindByAliases(request, *aliases);
}
bool AliasesPolicy::OnRequest(FacilityRequest & request)
{
H225_ArrayOf_AliasAddress *aliases = request.GetAliases();
return aliases && FindByAliases(request, *aliases);
}
std::map<PString, PString> ExplicitPolicy::m_destMap;
ExplicitPolicy::ExplicitPolicy()
{
m_name = "Explicit";
m_iniSection = "Routing::Explicit";
}
void ExplicitPolicy::OnReload()
{
m_destMap.clear();
PStringToString mappings(GkConfig()->GetAllKeyValues("Routing::Explicit"));
for (PINDEX i = 0; i < mappings.GetSize(); ++i) {
PString src = mappings.GetKeyAt(i);
PString dest = mappings.GetDataAt(i);
H225_TransportAddress srcAddr;
if (GetTransportAddress(src, GK_DEF_ENDPOINT_SIGNAL_PORT, srcAddr)) {
if (!dest.IsEmpty()) {
if (IsIPAddress(dest)) {
// test parse IP, but store again as string
H225_TransportAddress destAddr;
if (GetTransportAddress(dest, GK_DEF_ENDPOINT_SIGNAL_PORT, destAddr)) {
m_destMap[AsDotString(srcAddr, false)] = AsDotString(destAddr, false);
} else {
PTRACE(1, "Error parsing dest entry in [Routing::Explicit]: " << src << "=" << dest);
SNMP_TRAP(7, SNMPError, Configuration, "Invalid [Routing::Explicit] configuration");
}
} else {
// store anything else as string, will be used as alias
m_destMap[AsDotString(srcAddr, false)] = dest;
}
} else {
PTRACE(1, "Error: Empty dest entry in [Routing::Explicit]: " << src << "=");
SNMP_TRAP(7, SNMPError, Configuration, "Invalid [Routing::Explicit] configuration");
}
} else {
PTRACE(1, "Error parsing src entry in [Routing::Explicit]: " << src << "=" << dest);
SNMP_TRAP(7, SNMPError, Configuration, "Invalid [Routing::Explicit] configuration");
}
}
}
void ExplicitPolicy::MapDestination(H225_AdmissionRequest & arq)
{
H225_TransportAddress & addr = arq.m_destCallSignalAddress;
PString orig = AsDotString(addr, false); // original IP without port
std::map<PString, PString>::const_iterator i = m_destMap.find(orig);
if (i != m_destMap.end()) {
PString newDest = i->second;
if (IsIPAddress(newDest)) {
// just rewrite the IP
H225_TransportAddress destAddr;
GetTransportAddress(newDest, GK_DEF_ENDPOINT_SIGNAL_PORT, destAddr); // ignore result, we have parsed these before
addr = destAddr;
} else {
// delete IP and set a new destination alias
arq.RemoveOptionalField(H225_AdmissionRequest::e_destCallSignalAddress);
arq.IncludeOptionalField(H225_AdmissionRequest::e_destinationInfo);
arq.m_destinationInfo.SetSize(1);
H323SetAliasAddress(newDest, arq.m_destinationInfo[0]);
}
PTRACE(4, "[Routing::Explicit]: map destination " << orig << " to " << newDest);
}
}
void ExplicitPolicy::MapDestination(H225_Setup_UUIE & setupBody)
{
H225_TransportAddress & addr = setupBody.m_destCallSignalAddress;
PString orig = AsDotString(addr, false); // original IP without port
std::map<PString, PString>::const_iterator i = m_destMap.find(orig);
if (i != m_destMap.end()) {
PString newDest = i->second;
if (IsIPAddress(newDest)) {
// just rewrite the IP
H225_TransportAddress destAddr;
GetTransportAddress(newDest, GK_DEF_ENDPOINT_SIGNAL_PORT, destAddr); // ignore result, we have parsed these before
addr = destAddr;
} else {
// delete IP and set a new destination alias
setupBody.RemoveOptionalField(H225_Setup_UUIE::e_destCallSignalAddress);
setupBody.IncludeOptionalField(H225_Setup_UUIE::e_destinationAddress);
setupBody.m_destinationAddress.SetSize(1);
H323SetAliasAddress(newDest, setupBody.m_destinationAddress[0]);
}
PTRACE(4, "[Routing::Explicit]: map destination " << orig << " to " << newDest);
}
}
void ExplicitPolicy::MapDestination(H225_Facility_UUIE & facilityBody)
{
H225_TransportAddress & addr = facilityBody.m_alternativeAddress;
PString orig = AsDotString(addr, false); // original IP without port
std::map<PString, PString>::const_iterator i = m_destMap.find(orig);
if (i != m_destMap.end()) {
PString newDest = i->second;
if (IsIPAddress(newDest)) {
// just rewrite the IP
H225_TransportAddress destAddr;
GetTransportAddress(newDest, GK_DEF_ENDPOINT_SIGNAL_PORT, destAddr); // ignore result, we have parsed these before
addr = destAddr;
} else {
// delete IP and set a new destination alias
facilityBody.RemoveOptionalField(H225_Facility_UUIE::e_alternativeAddress);
facilityBody.IncludeOptionalField(H225_Facility_UUIE::e_alternativeAliasAddress);
facilityBody.m_alternativeAliasAddress.SetSize(1);
H323SetAliasAddress(newDest, facilityBody.m_alternativeAliasAddress[0]);
}
PTRACE(4, "[Routing::Explicit]: map destination " << orig << " to " << newDest);
}
}
bool ExplicitPolicy::OnRequest(AdmissionRequest & request)
{
H225_AdmissionRequest & arq = request.GetRequest();
if (arq.HasOptionalField(H225_AdmissionRequest::e_destCallSignalAddress)) {
MapDestination(arq);
// check if the mapping removed the destination IP
if (!arq.HasOptionalField(H225_AdmissionRequest::e_destCallSignalAddress))
return false;
// TODO: also check if one of the aliases is a transport-ID ?
Route route(m_name, arq.m_destCallSignalAddress);
route.m_destEndpoint = RegistrationTable::Instance()->FindBySignalAdr(route.m_destAddr);
#ifdef HAS_H46023
if (!route.m_destEndpoint &&
arq.HasOptionalField(H225_AdmissionRequest::e_genericData) &&
H460_FeatureSet(arq.m_genericData).HasFeature(24)) {
H225_RasMessage ras;
ras.SetTag(H225_RasMessage::e_admissionRequest);
H225_AdmissionRequest & req = (H225_AdmissionRequest &)ras;
req = arq;
route.m_destEndpoint = RegistrationTable::Instance()->InsertRec(ras);
}
#endif
return request.AddRoute(route);
}
return false;
}
bool ExplicitPolicy::OnRequest(SetupRequest & request)
{
H225_Setup_UUIE & setup = request.GetRequest();
if (setup.HasOptionalField(H225_Setup_UUIE::e_destCallSignalAddress)) {
// don't map IP here, for Setup already done in OnSetup()
Route route(m_name, setup.m_destCallSignalAddress);
route.m_destEndpoint = RegistrationTable::Instance()->FindBySignalAdr(route.m_destAddr);
return request.AddRoute(route);
}
// TODO: also check if one of the aliases is a transport-ID ?
return false;
}
bool ExplicitPolicy::OnRequest(FacilityRequest & request)
{
H225_Facility_UUIE & facility = request.GetRequest();
if (facility.HasOptionalField(H225_Facility_UUIE::e_alternativeAddress)) {
MapDestination(facility);
// check if the mapping removed the destination IP
if (!facility.HasOptionalField(H225_Facility_UUIE::e_alternativeAddress))
return false;
Route route(m_name, facility.m_alternativeAddress);
route.m_destEndpoint = RegistrationTable::Instance()->FindBySignalAdr(route.m_destAddr);
return request.AddRoute(route);
}
// TODO: also check if one of the aliases is a transport-ID ?
return false;
}
InternalPolicy::InternalPolicy()
: roundRobin(Toolkit::AsBool(GkConfig()->GetString("RasSrv::ARQFeatures", "RoundRobinGateways", "1"))),
leastUsedRouting(GkConfig()->GetBoolean("RasSrv::ARQFeatures", "LeastUsedRouting", false))
{
m_name = "Internal";
if (roundRobin && leastUsedRouting) {
PTRACE(1, "ERROR: RoundRobinGateways and LeastUsedRouting are logically incompatible, round-robin disabled");
roundRobin = false;
}
}
bool InternalPolicy::OnRequest(AdmissionRequest & request)
{
H225_ArrayOf_AliasAddress *aliases = request.GetAliases();
if (aliases == NULL || !FindByAliases(request, *aliases))
return false;
return true;
}
bool InternalPolicy::OnRequest(SetupRequest & request)
{
H225_ArrayOf_AliasAddress *aliases = request.GetAliases();
if (aliases == NULL || !FindByAliases(request, *aliases))
return false;
return true;
}
bool InternalPolicy::FindByAliases(RoutingRequest & request, H225_ArrayOf_AliasAddress & aliases)
{
list<Route> routes;
RegistrationTable::Instance()->FindEndpoint(aliases, roundRobin, leastUsedRouting, true, routes);
list<Route>::iterator i = routes.begin();
while (i != routes.end()) {
i->m_policy = m_name;
request.AddRoute(*i++);
}
return !routes.empty();
}
bool InternalPolicy::FindByAliases(LocationRequest & request, H225_ArrayOf_AliasAddress & aliases)
{
// do not apply round robin selection for Location ReQuests
list<Route> routes;
if (RegistrationTable::Instance()->FindEndpoint(aliases, false, false, true, routes))
request.SetRejectReason(H225_LocationRejectReason::e_resourceUnavailable);
list<Route>::iterator i = routes.begin();
while (i != routes.end()) {
i->m_policy = m_name;
request.AddRoute(*i++);
}
return !routes.empty();
}
bool InternalPolicy::FindByAliases(SetupRequest & request, H225_ArrayOf_AliasAddress & aliases)
{
list<Route> routes;
if (RegistrationTable::Instance()->FindEndpoint(aliases, roundRobin, leastUsedRouting, true, routes))
request.SetRejectReason(H225_ReleaseCompleteReason::e_gatewayResources);
list<Route>::iterator i = routes.begin();
while (i != routes.end()) {
i->m_policy = m_name;
request.AddRoute(*i++);
}
return !routes.empty();
}
bool InternalPolicy::FindByAliases(AdmissionRequest & request, H225_ArrayOf_AliasAddress & aliases)
{
list<Route> routes;
if (RegistrationTable::Instance()->FindEndpoint(aliases, roundRobin, leastUsedRouting, true, routes))
request.SetRejectReason(H225_AdmissionRejectReason::e_resourceUnavailable);
endptr ep;
if (request.SupportLanguages())
ep = RegistrationTable::Instance()->FindByEndpointId(request.GetRequest().m_endpointIdentifier);
list<Route>::iterator i = routes.begin();
while (i != routes.end()) {
if (ep && i->m_destEndpoint && !i->SetLanguages(i->m_destEndpoint->GetLanguages(), ep->GetLanguages())) {
PTRACE(4, m_name << "\tRoute found but rejected as no common language");
++i;
} else {
i->m_policy = m_name;
request.AddRoute(*i++);
}
}
return !routes.empty();
}
ParentPolicy::ParentPolicy()
{
m_gkClient = RasServer::Instance()->GetGkClient();
m_name = "Parent";
}
bool ParentPolicy::IsActive() const
{
return m_gkClient ? m_gkClient->IsRegistered() : false;
}
bool ParentPolicy::OnRequest(AdmissionRequest & arq_obj)
{
return m_gkClient->SendARQ(arq_obj);
}
bool ParentPolicy::OnRequest(LocationRequest & lrq_obj)
{
return m_gkClient->SendLRQ(lrq_obj);
}
bool ParentPolicy::OnRequest(SetupRequest & setup_obj)
{
return !(setup_obj.GetFlags() & RoutingRequest::e_fromParent) && m_gkClient->SendARQ(setup_obj);
}
bool ParentPolicy::OnRequest(FacilityRequest & facility_obj)
{
return !(facility_obj.GetFlags() & RoutingRequest::e_fromParent) && m_gkClient->SendARQ(facility_obj);
}
DNSPolicy::DNSPolicy()
{
m_name = "DNS";
m_iniSection = "Routing::DNS";
m_resolveNonLocalLRQs = true;
}
void DNSPolicy::LoadConfig(const PString & instance)
{
m_resolveNonLocalLRQs = Toolkit::AsBool(GkConfig()->GetString(m_iniSection, "ResolveNonLocalLRQ", "1"));
}
bool DNSPolicy::DNSLookup(const PString & hostname, PIPSocket::Address & addr) const
{
struct addrinfo hints;
struct addrinfo * result = NULL;
memset(&hints, 0, sizeof(hints));
if (Toolkit::Instance()->IsIPv6Enabled()) {
hints.ai_family = AF_UNSPEC;
} else {
hints.ai_family = AF_INET;
}
if (getaddrinfo(hostname, NULL, &hints, &result) != 0)
return false;
addr = PIPSocket::Address(result->ai_family, result->ai_addrlen, result->ai_addr);
freeaddrinfo(result);
return true;
}
bool DNSPolicy::FindByAliases(RoutingRequest & request, H225_ArrayOf_AliasAddress & aliases)
{
for (PINDEX i = 0; i < aliases.GetSize(); ++i) {
// don't apply DNS to dialedDigits
if (aliases[i].GetTag() == H225_AliasAddress::e_dialedDigits)
continue;
PString alias(AsString(aliases[i], FALSE));
PINDEX at = alias.Find('@');
PINDEX hashhash = alias.Find("##"); // Polycom's domain##alias notation
PString domain = alias;
if (at != P_MAX_INDEX)
domain = alias.Mid(at + 1);
if (hashhash != P_MAX_INDEX)
domain = alias.Left(hashhash);
if (domain.Find("ip$") == 0)
domain.Replace("ip$", "", false);
PStringArray parts = SplitIPAndPort(domain, GK_DEF_ENDPOINT_SIGNAL_PORT);
domain = parts[0];
WORD port = (WORD)parts[1].AsUnsigned();
PIPSocket::Address addr;
if (DNSLookup(domain, addr) && addr.IsValid()) {
H225_TransportAddress dest;
if (!request.GetGatewayDestination(dest)) {
dest = SocketToH225TransportAddr(addr, port);
PString aliasPart = "";
if (at != P_MAX_INDEX)
aliasPart = alias.Left(at);
if (hashhash != P_MAX_INDEX)
aliasPart = alias.Mid(hashhash + 2);
if (!aliasPart.IsEmpty()) {
H323SetAliasAddress(aliasPart, aliases[i]);
} else {
aliases.RemoveAt(i);
}
PTRACE(4, "ROUTING\tDNS policy resolves to " << aliasPart << " @ " << AsDotString(dest));
}
if (Toolkit::Instance()->IsGKHome(addr)
&& ( (port == GkConfig()->GetInteger("RoutedMode", "CallSignalPort", GK_DEF_CALL_SIGNAL_PORT))
|| (port == GkConfig()->GetInteger("RoutedMode", "TLSCallSignalPort", GK_DEF_TLS_CALL_SIGNAL_PORT))) ) {
// check if the domain is my IP, if so route to local endpoint if available
H225_ArrayOf_AliasAddress find_aliases;
find_aliases.SetSize(1);
PString aliasPart = "";
if (at != P_MAX_INDEX)
aliasPart = alias.Left(at);
if (hashhash != P_MAX_INDEX)
aliasPart = alias.Mid(hashhash + 2);
H323SetAliasAddress(aliasPart, find_aliases[0]);
endptr ep = RegistrationTable::Instance()->FindByAliases(find_aliases);
if (ep) {
dest = ep->GetCallSignalAddress();
} else {
continue; // can't route this alias locally, try next alias
}
}
bool isARQ = dynamic_cast<AdmissionRequest *>(&request);
if (GkConfig()->GetBoolean("Routing::DNS", "RewriteARQDestination", true) || !isARQ) {
// tell caller the changed destination
request.SetFlag(RoutingRequest::e_aliasesChanged);
}
Route route(m_name, dest);
route.m_destEndpoint = RegistrationTable::Instance()->FindBySignalAdr(dest);
request.AddRoute(route);
return true;
}
}
return false;
}
bool DNSPolicy::FindByAliases(LocationRequest & request, H225_ArrayOf_AliasAddress & aliases)
{
for (PINDEX i = 0; i < aliases.GetSize(); ++i) {
// don't apply DNS to dialedDigits
if (aliases[i].GetTag() == H225_AliasAddress::e_dialedDigits)
continue;
PString alias(AsString(aliases[i], FALSE));
PINDEX at = alias.Find('@');
PINDEX hashhash = alias.Find("##"); // Polycom's domain##alias notation
PString domain = alias;
if (at != P_MAX_INDEX)
domain = alias.Mid(at + 1);
if (hashhash != P_MAX_INDEX)
domain = alias.Left(hashhash);
if (domain.Find("ip$") == 0)
domain.Replace("ip$", "", false);
PStringArray parts = SplitIPAndPort(domain, GK_DEF_ENDPOINT_SIGNAL_PORT);
domain = parts[0];
WORD port = (WORD)parts[1].AsUnsigned();
PIPSocket::Address addr;
if (DNSLookup(domain, addr) && addr.IsValid()) {
H225_TransportAddress dest = SocketToH225TransportAddr(addr, port);
if (Toolkit::Instance()->IsGKHome(addr)) {
// only apply DNS policy to LRQs that resolve locally
H225_ArrayOf_AliasAddress find_aliases;
PString aliasPart = "";
if (at != P_MAX_INDEX)
aliasPart = alias.Left(at);
if (hashhash != P_MAX_INDEX)
aliasPart = alias.Mid(hashhash + 2);
find_aliases.SetSize(1);
H323SetAliasAddress(aliasPart, find_aliases[0]);
endptr ep = RegistrationTable::Instance()->FindByAliases(find_aliases);
if (ep) {
if (!(RasServer::Instance()->IsGKRouted())) {
// in direct mode, send call directly to EP
dest = ep->GetCallSignalAddress();
}
Route route(m_name, dest);
route.m_destEndpoint = ep;
request.AddRoute(route);
request.SetFlag(RoutingRequest::e_aliasesChanged);
// remove the domain name part
H323SetAliasAddress(alias.Left(at), aliases[i]);
PTRACE(4, "ROUTING\tDNS policy resolves to " << alias.Left(at));
return true;
}
} else if (m_resolveNonLocalLRQs) {
Route route(m_name, dest);
request.AddRoute(route);
PTRACE(4, "ROUTING\tDNS policy resolves to " << domain);
return true;
}
}
}
if (!m_resolveNonLocalLRQs) {
PTRACE(4, "ROUTING\tPolicy DNS configured to only route LRQs that resolve locally");
}
return false;
}
VirtualQueue::VirtualQueue()
: m_active(false), m_requestTimeout(DEFAULT_ROUTE_REQUEST_TIMEOUT * 1000)
{
}
VirtualQueue::~VirtualQueue()
{
m_listMutex.Wait();
int numrequests = m_pendingRequests.size();
if (numrequests) {
PTRACE(1, "VQueue\tDestroying virtual queue with " << numrequests << " pending requests");
}
RouteRequests::iterator i = m_pendingRequests.begin();
while (i != m_pendingRequests.end()) {
RouteRequest *r = *i++;
r->m_sync.Signal();
}
m_listMutex.Signal();
// wait a moment to give a chance to pending requests to cleanup
if (numrequests) {
PThread::Sleep(500);
}
}
void VirtualQueue::OnReload()
{
PWaitAndSignal lock(m_listMutex);
m_requestTimeout = GkConfig()->GetInteger(
CTIsection,
GkConfig()->HasKey(CTIsection, "RequestTimeout") ? "RequestTimeout" : "CTI_Timeout", DEFAULT_ROUTE_REQUEST_TIMEOUT) * 1000;
m_requestTimeout = PMAX((long)100, m_requestTimeout); // min wait: 100 msec
m_active = false;
m_virtualQueueAliases.RemoveAll();
PString vqueues = GkConfig()->GetString(CTIsection, "VirtualQueueAliases", "");
if (vqueues.IsEmpty()) // backward compatibility
vqueues = GkConfig()->GetString(CTIsection, "VirtualQueue", "");
if (!vqueues.IsEmpty()) {
m_virtualQueueAliases = vqueues.Tokenise(" ,;\t", false);
if (m_virtualQueueAliases.GetSize() > 0) {
PTRACE(2, "VQueue\t(CTI) Virtual queues enabled (aliases:" << vqueues
<< "), request timeout: " << m_requestTimeout/1000 << " s");
m_active = true;
}
}
m_virtualQueuePrefixes.RemoveAll();
vqueues = GkConfig()->GetString(CTIsection, "VirtualQueuePrefixes", "");
if (!vqueues.IsEmpty()) {
m_virtualQueuePrefixes = vqueues.Tokenise(" ,;\t", false);
if (m_virtualQueuePrefixes.GetSize() > 0) {
PTRACE(2, "VQueue\t(CTI) Virtual queues enabled (prefixes:" << vqueues
<< "), request timeout: " << m_requestTimeout/1000 << " s");
m_active = true;
}
}
m_virtualQueueRegex = GkConfig()->GetString(CTIsection, "VirtualQueueRegex", "");
if (!m_virtualQueueRegex.IsEmpty()) {
// check if regex is valid
PRegularExpression regex(m_virtualQueueRegex, PRegularExpression::Extended);