//=============================================================================
//
// File : KviDnsResolver.cpp
// Creation date : Sat Jul 21 2000 17:19:31 by Szymon Stefanek
//
// This file is part of the KVIrc IRC client distribution
// Copyright (C) 2000-2010 Szymon Stefanek (pragma at kvirc dot net)
//
// This program is FREE software. You can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// 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.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=============================================================================
#include "KviDnsResolver.h"
#include "KviError.h"
#include "KviNetUtils.h"
#include "KviQString.h"
#include <QApplication>
#include <cerrno>
#if defined(COMPILE_ON_WINDOWS) || defined(COMPILE_ON_MINGW)
#include <winsock2.h>
#ifdef COMPILE_IPV6_SUPPORT
#ifdef WIN2K
#include <ws2ip6.h>
#else
#include <ws2tcpip.h>
//#include <tpipv6.h>
#endif
#endif
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#endif
// this is for FreeBSD
#ifndef EAI_ADDRFAMILY
#define EAI_ADDRFAMILY EAI_FAMILY
#endif
#ifndef EAI_NODATA
#define EAI_NODATA 0
#endif
KviDnsResolverResult::KviDnsResolverResult()
{
m_eError = KviError::Success;
}
void KviDnsResolverResult::appendHostname(const QString & host)
{
m_pHostnameList.push_back(host);
}
void KviDnsResolverResult::appendAddress(const QString & addr)
{
m_pIpAddressList.push_back(addr);
}
KviDnsResolverThread::KviDnsResolverThread(KviDnsResolver * pDns)
: QThread()
{
m_pParentDns = pDns;
}
KviDnsResolverThread::~KviDnsResolverThread()
= default;
KviError::Code KviDnsResolverThread::translateDnsError(int iErr)
{
#if defined(COMPILE_IPV6_SUPPORT) || (!defined(COMPILE_ON_WINDOWS) && !defined(COMPILE_ON_MINGW))
switch(iErr)
{
case EAI_FAMILY:
return KviError::UnsupportedAddressFamily;
break;
#if(!defined(COMPILE_ON_WINDOWS) && !defined(COMPILE_ON_MINGW)) && defined(EAI_ADDRFAMILY) && (EAI_ADDRFAMILY != EAI_FAMILY)
case EAI_ADDRFAMILY:
return KviError::UnsupportedAddressFamily;
break;
#endif
// NOT FreeBSD ARE WE?
#if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME)
// YARR
case EAI_NODATA:
return KviError::ValidNameButNoIpAddress;
break;
#endif
case EAI_FAIL:
return KviError::UnrecoverableNameserverError;
break;
case EAI_AGAIN:
return KviError::DNSTemporaneousFault;
break;
// this should never happen
case EAI_BADFLAGS:
return KviError::DNSInternalErrorBadFlags;
break;
case EAI_MEMORY:
return KviError::DNSInternalErrorOutOfMemory;
break;
// got this when experimenting with protocols
case EAI_SERVICE:
return KviError::DNSInternalErrorServiceNotSupported;
break;
#if !defined(COMPILE_ON_WINDOWS) && !defined(COMPILE_ON_MINGW)
case EAI_NONAME:
return KviError::DNSNoName;
break;
#endif
// got this when experimenting with protocols
case EAI_SOCKTYPE:
return KviError::DNSInternalErrorUnsupportedSocketType;
break;
#if !defined(COMPILE_ON_WINDOWS) && !defined(COMPILE_ON_MINGW)
case EAI_SYSTEM:
return KviError::DNSQueryFailed;
#endif
}
#endif
return KviError::DNSQueryFailed;
}
void KviDnsResolverThread::postDnsError(KviDnsResolverResult * pDns, KviError::Code error)
{
pDns->setError(error);
KviDnsResolverThreadEvent * pEvent = new KviDnsResolverThreadEvent(pDns);
QApplication::postEvent(m_pParentDns, pEvent);
}
void KviDnsResolverThread::run()
{
KviDnsResolverResult * dns = new KviDnsResolverResult();
dns->setQuery(m_szQuery);
if(m_szQuery.isEmpty())
{
postDnsError(dns, KviError::NoHostToResolve);
return;
}
#ifndef COMPILE_IPV6_SUPPORT
if(m_queryType != KviDnsResolver::IPv4)
{
if(m_queryType == KviDnsResolver::IPv6)
{
postDnsError(dns, KviError::NoIPv6Support);
return;
}
m_queryType = KviDnsResolver::IPv4;
}
#endif
#if(defined(COMPILE_ON_WINDOWS) || defined(COMPILE_ON_MINGW)) && !defined(COMPILE_IPV6_SUPPORT)
if(m_queryType == KviDnsResolver::IPv6)
{
postDnsError(dns, KviError::NoIPv6Support);
return;
}
// gethostbyaddr and gethostbyname are thread-safe on Windoze
struct in_addr inAddr;
struct hostent * pHostEntry = nullptr;
// DIE DIE!....I hope that this stuff will disappear sooner or later :)
if(KviNetUtils::stringIpToBinaryIp(m_szQuery, &inAddr))
{
pHostEntry = gethostbyaddr((const char *)&inAddr, sizeof(inAddr), AF_INET);
}
else
{
pHostEntry = gethostbyname(m_szQuery.toUtf8().data());
}
if(!pHostEntry)
{
switch(h_errno)
{
case HOST_NOT_FOUND:
dns->setError(KviError::HostNotFound);
break;
case NO_ADDRESS:
dns->setError(KviError::ValidNameButNoIpAddress);
break;
case NO_RECOVERY:
dns->setError(KviError::UnrecoverableNameserverError);
break;
case TRY_AGAIN:
dns->setError(KviError::DNSTemporaneousFault);
break;
default:
dns->setError(KviError::DNSQueryFailed);
break;
}
}
else
{
dns->appendHostname(pHostEntry->h_name);
QString szIp;
KviNetUtils::binaryIpToStringIp(*((struct in_addr *)(pHostEntry->h_addr)), szIp);
dns->appendAddress(szIp);
int idx = 1;
while(pHostEntry->h_addr_list[idx])
{
QString tmp;
KviNetUtils::binaryIpToStringIp(*((struct in_addr *)(pHostEntry->h_addr_list[idx])), tmp);
if(!tmp.isEmpty())
dns->appendAddress(tmp);
++idx;
}
if(pHostEntry->h_aliases[0])
{
dns->appendHostname(QString::fromUtf8(pHostEntry->h_aliases[0]));
if(pHostEntry->h_aliases[1])
dns->appendHostname(QString::fromUtf8(pHostEntry->h_aliases[1]));
}
}
#else
int retVal;
struct sockaddr_in ipv4Addr;
#ifdef COMPILE_IPV6_SUPPORT
struct sockaddr_in6 ipv6Addr;
bool bIsIPv6Ip = false;
#endif
bool bIsIPv4Ip = KviNetUtils::stringIpToBinaryIp(m_szQuery, (struct in_addr *)&(ipv4Addr.sin_addr));
#ifdef COMPILE_IPV6_SUPPORT
if(!bIsIPv4Ip)
bIsIPv6Ip = KviNetUtils::stringIpToBinaryIp_V6(m_szQuery, (struct in6_addr *)&(ipv6Addr.sin6_addr));
#endif
#ifdef COMPILE_IPV6_SUPPORT
if(bIsIPv4Ip || bIsIPv6Ip)
{
#else
if(bIsIPv4Ip)
{
#endif
// use getnameinfo...
char retname[1025]; // should be enough....
#ifdef COMPILE_IPV6_SUPPORT
if(bIsIPv4Ip)
{
#endif
ipv4Addr.sin_family = AF_INET;
ipv4Addr.sin_port = 0;
// NI_NAMEREQD as last param ?
retVal = getnameinfo((struct sockaddr *)&ipv4Addr, sizeof(ipv4Addr), retname, 1025, nullptr, 0, NI_NAMEREQD);
#ifdef COMPILE_IPV6_SUPPORT
}
else
{
ipv6Addr.sin6_family = AF_INET6;
ipv6Addr.sin6_port = 0;
retVal = getnameinfo((struct sockaddr *)&ipv6Addr, sizeof(ipv6Addr), retname, 1025, nullptr, 0, NI_NAMEREQD);
}
#endif
if(retVal != 0)
dns->setError(translateDnsError(retVal));
else
{
dns->appendHostname(retname);
dns->appendAddress(m_szQuery);
}
}
else
{
struct addrinfo * pRet = nullptr;
struct addrinfo * pNext;
struct addrinfo hints;
hints.ai_flags = 0; //AI_CANONNAME; <-- for IPV6 it makes cannoname to point to the IP address!
#ifdef COMPILE_IPV6_SUPPORT
hints.ai_family = (m_queryType == KviDnsResolver::IPv6) ? PF_INET6 : ((m_queryType == KviDnsResolver::IPv4) ? PF_INET : PF_UNSPEC);
#else
hints.ai_family = PF_INET;
#endif
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
hints.ai_addrlen = 0;
hints.ai_canonname = nullptr;
hints.ai_addr = nullptr;
hints.ai_next = nullptr;
retVal = getaddrinfo(m_szQuery.toUtf8().data(), nullptr, &hints, &pRet);
if(retVal != 0)
{
dns->setError(translateDnsError(retVal));
}
else if(!pRet)
{
dns->setError(KviError::DNSQueryFailed);
}
else
{
dns->appendHostname(pRet->ai_canonname ? QString::fromUtf8(pRet->ai_canonname) : m_szQuery);
QString szIp;
#ifdef COMPILE_IPV6_SUPPORT
if(pRet->ai_family == PF_INET6)
KviNetUtils::binaryIpToStringIp_V6(((sockaddr_in6 *)(pRet->ai_addr))->sin6_addr, szIp);
else
{
#endif
KviNetUtils::binaryIpToStringIp(((sockaddr_in *)(pRet->ai_addr))->sin_addr, szIp);
#ifdef COMPILE_IPV6_SUPPORT
}
#endif
dns->appendAddress(szIp);
pNext = pRet->ai_next;
while(pNext)
{
QString tmp;
#ifdef COMPILE_IPV6_SUPPORT
if(pNext->ai_family == PF_INET6)
KviNetUtils::binaryIpToStringIp_V6(((sockaddr_in6 *)(pNext->ai_addr))->sin6_addr, tmp);
else
{
#endif
KviNetUtils::binaryIpToStringIp(((sockaddr_in *)(pNext->ai_addr))->sin_addr, tmp);
#ifdef COMPILE_IPV6_SUPPORT
}
#endif
if(!tmp.isEmpty())
dns->appendAddress(tmp);
if(pNext->ai_canonname)
{
// FIXME: only of not equal to other names ?
dns->appendHostname(QString::fromUtf8(pNext->ai_canonname));
}
pNext = pNext->ai_next;
}
}
if(pRet)
freeaddrinfo(pRet);
}
#endif // !COMPILE_ON_WINDOWS
KviDnsResolverThreadEvent * pEvent = new KviDnsResolverThreadEvent(dns);
QApplication::postEvent(m_pParentDns, pEvent);
}
KviDnsResolver::KviDnsResolver()
: QObject()
{
m_pSlaveThread = new KviDnsResolverThread(this);
m_pDnsResult = new KviDnsResolverResult();
m_state = Idle;
}
KviDnsResolver::~KviDnsResolver()
{
if(m_pSlaveThread)
{
if(!m_pSlaveThread->wait(30000))
qDebug("Failed to wait for the slave DNS thread: we're probably going to crash!");
delete m_pSlaveThread; // will eventually terminate it (but it will also block us!!!)
}
delete m_pDnsResult;
}
bool KviDnsResolver::isRunning() const
{
return (m_state == Busy);
}
bool KviDnsResolver::lookup(const QString & szQuery, QueryType type)
{
if(m_state == Busy)
return false;
m_pSlaveThread->setQuery(szQuery.trimmed(), type);
m_pSlaveThread->start();
m_state = Busy;
return true;
}
KviError::Code KviDnsResolver::error()
{
if(!m_pDnsResult)
return KviError::DNSQueryFailed;
return m_pDnsResult->error();
}
QString KviDnsResolver::errorString()
{
return KviError::getDescription(error());
}
KviDnsResolverResult * KviDnsResolver::result()
{
if(!m_pDnsResult)
m_pDnsResult = new KviDnsResolverResult();
return m_pDnsResult;
}
const std::vector<QString> & KviDnsResolver::hostnameList()
{
return result()->hostnameList();
}
const std::vector<QString> & KviDnsResolver::ipAddressList()
{
return result()->ipAddressList();
}
std::size_t KviDnsResolver::hostnameCount()
{
return result()->hostnameList().size();
}
std::size_t KviDnsResolver::ipAddressCount()
{
return result()->ipAddressList().size();
}
const QString & KviDnsResolver::hostName()
{
const auto & list = result()->hostnameList();
return list.empty() ? KviQString::Empty : list.front();
}
const QString & KviDnsResolver::firstIpAddress()
{
const auto & list = result()->ipAddressList();
return list.empty() ? KviQString::Empty : list.front();
}
const QString & KviDnsResolver::query()
{
return result()->query();
}
bool KviDnsResolver::event(QEvent * e)
{
if(e->type() == QEvent::User)
{
KviDnsResolverThreadEvent * pEvent = dynamic_cast<KviDnsResolverThreadEvent *>(e);
if(pEvent)
{
delete m_pDnsResult;
m_pDnsResult = pEvent->releaseResult();
m_state = (m_pDnsResult->error() == KviError::Success) ? Success : Failure;
emit lookupDone(this);
return true;
} // else oops... unknown thread event ?
}
return QObject::event(e);
}
