/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtNetwork module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain ** additional rights. These rights are described in the Nokia Qt LGPL ** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this ** package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ //#define QHOSTINFO_DEBUG #include "qplatformdefs.h" #include "qhostinfo_p.h" #include "qiodevice.h" #include #include #include #include #include #include #include #include #include #if defined(Q_OS_VXWORKS) # include #else # include #endif #if defined (QT_NO_GETADDRINFO) #include QT_BEGIN_NAMESPACE Q_GLOBAL_STATIC(QMutex, getHostByNameMutex) QT_END_NAMESPACE #endif QT_BEGIN_NAMESPACE // Almost always the same. If not, specify in qplatformdefs.h. #if !defined(QT_SOCKOPTLEN_T) # define QT_SOCKOPTLEN_T QT_SOCKLEN_T #endif // HP-UXi has a bug in getaddrinfo(3) that makes it thread-unsafe // with this flag. So disable it in that platform. #if defined(AI_ADDRCONFIG) && !defined(Q_OS_HPUX) # define Q_ADDRCONFIG AI_ADDRCONFIG #endif typedef struct __res_state *res_state_ptr; typedef int (*res_init_proto)(void); static res_init_proto local_res_init = 0; typedef int (*res_ninit_proto)(res_state_ptr); static res_ninit_proto local_res_ninit = 0; typedef void (*res_nclose_proto)(res_state_ptr); static res_nclose_proto local_res_nclose = 0; static res_state_ptr local_res = 0; static void resolveLibrary() { #ifndef QT_NO_LIBRARY QLibrary lib(QLatin1String("resolv")); if (!lib.load()) return; local_res_init = res_init_proto(lib.resolve("__res_init")); if (!local_res_init) local_res_init = res_init_proto(lib.resolve("res_init")); local_res_ninit = res_ninit_proto(lib.resolve("__res_ninit")); if (!local_res_ninit) local_res_ninit = res_ninit_proto(lib.resolve("res_ninit")); if (!local_res_ninit) { // if we can't get a thread-safe context, we have to use the global _res state local_res = res_state_ptr(lib.resolve("_res")); } else { local_res_nclose = res_nclose_proto(lib.resolve("res_nclose")); if (!local_res_nclose) local_res_nclose = res_nclose_proto(lib.resolve("__res_nclose")); if (!local_res_nclose) local_res_ninit = 0; } #endif } QHostInfo QHostInfoAgent::fromName(const QString &hostName) { QHostInfo results; #if defined(QHOSTINFO_DEBUG) qDebug("QHostInfoAgent::fromName(%s) looking up...", hostName.toLatin1().constData()); #endif // Load res_init on demand. static volatile bool triedResolve = false; if (!triedResolve) { #ifndef QT_NO_THREAD QMutexLocker locker(QMutexPool::globalInstanceGet(&local_res_init)); #endif if (!triedResolve) { resolveLibrary(); triedResolve = true; } } // If res_init is available, poll it. if (local_res_init) local_res_init(); QHostAddress address; if (address.setAddress(hostName)) { // Reverse lookup // Reverse lookups using getnameinfo are broken on darwin, use gethostbyaddr instead. #if !defined (QT_NO_GETADDRINFO) && !defined (Q_OS_DARWIN) && !defined (Q_OS_SYMBIAN) sockaddr_in sa4; #ifndef QT_NO_IPV6 sockaddr_in6 sa6; #endif sockaddr *sa = 0; QT_SOCKLEN_T saSize = 0; if (address.protocol() == QAbstractSocket::IPv4Protocol) { sa = (sockaddr *)&sa4; saSize = sizeof(sa4); memset(&sa4, 0, sizeof(sa4)); sa4.sin_family = AF_INET; sa4.sin_addr.s_addr = htonl(address.toIPv4Address()); } #ifndef QT_NO_IPV6 else { sa = (sockaddr *)&sa6; saSize = sizeof(sa6); memset(&sa6, 0, sizeof(sa6)); sa6.sin6_family = AF_INET6; memcpy(sa6.sin6_addr.s6_addr, address.toIPv6Address().c, sizeof(sa6.sin6_addr.s6_addr)); } #endif char hbuf[NI_MAXHOST]; if (!sa || getnameinfo(sa, saSize, hbuf, sizeof(hbuf), 0, 0, 0) != 0) { results.setError(QHostInfo::HostNotFound); results.setErrorString(tr("Host not found")); return results; } results.setHostName(QString::fromLatin1(hbuf)); #else in_addr_t inetaddr = qt_safe_inet_addr(hostName.toLatin1().constData()); struct hostent *ent = gethostbyaddr((const char *)&inetaddr, sizeof(inetaddr), AF_INET); if (!ent) { results.setError(QHostInfo::HostNotFound); results.setErrorString(tr("Host not found")); return results; } results.setHostName(QString::fromLatin1(ent->h_name)); #endif } // IDN support QByteArray aceHostname; if (results.hostName().isEmpty()) { // it's a hostname resolution aceHostname = QUrl::toAce(hostName); results.setHostName(hostName); if (aceHostname.isEmpty()) { results.setError(QHostInfo::HostNotFound); results.setErrorString(hostName.isEmpty() ? QObject::tr("No host name given") : QObject::tr("Invalid hostname")); return results; } } else { // it's an IP reverse resolution aceHostname = results.hostName().toLatin1(); } #if !defined (QT_NO_GETADDRINFO) // Call getaddrinfo, and place all IPv4 addresses at the start and // the IPv6 addresses at the end of the address list in results. addrinfo *res = 0; struct addrinfo hints; memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; #ifdef Q_ADDRCONFIG hints.ai_flags = Q_ADDRCONFIG; #endif int result = getaddrinfo(aceHostname.constData(), 0, &hints, &res); # ifdef Q_ADDRCONFIG if (result == EAI_BADFLAGS) { // if the lookup failed with AI_ADDRCONFIG set, try again without it hints.ai_flags = 0; result = getaddrinfo(aceHostname.constData(), 0, &hints, &res); } # endif if (result == 0) { addrinfo *node = res; QList addresses; while (node) { if (node->ai_family == AF_INET) { QHostAddress addr; addr.setAddress(ntohl(((sockaddr_in *) node->ai_addr)->sin_addr.s_addr)); if (!addresses.contains(addr)) addresses.append(addr); } #ifndef QT_NO_IPV6 else if (node->ai_family == AF_INET6) { QHostAddress addr; addr.setAddress(((sockaddr_in6 *) node->ai_addr)->sin6_addr.s6_addr); if (!addresses.contains(addr)) addresses.append(addr); } #endif node = node->ai_next; } if (addresses.isEmpty() && node == 0) { // Reached the end of the list, but no addresses were found; this // means the list contains one or more unknown address types. results.setError(QHostInfo::UnknownError); results.setErrorString(tr("Unknown address type")); } results.setAddresses(addresses); freeaddrinfo(res); } else if (result == EAI_NONAME || result == EAI_FAIL #ifdef EAI_NODATA // EAI_NODATA is deprecated in RFC 3493 || result == EAI_NODATA #endif ) { results.setError(QHostInfo::HostNotFound); results.setErrorString(tr("Host not found")); } else { results.setError(QHostInfo::UnknownError); results.setErrorString(QString::fromLocal8Bit(gai_strerror(result))); } #else // Fall back to gethostbyname for platforms that don't define // getaddrinfo. gethostbyname does not support IPv6, and it's not // reentrant on all platforms. For now this is okay since we only // use one QHostInfoAgent, but if more agents are introduced, locking // must be provided. QMutexLocker locker(::getHostByNameMutex()); hostent *result = gethostbyname(aceHostname.constData()); if (result) { if (result->h_addrtype == AF_INET) { QList addresses; for (char **p = result->h_addr_list; *p != 0; p++) { QHostAddress addr; addr.setAddress(ntohl(*((quint32 *)*p))); if (!addresses.contains(addr)) addresses.prepend(addr); } results.setAddresses(addresses); } else { results.setError(QHostInfo::UnknownError); results.setErrorString(tr("Unknown address type")); } #if !defined(Q_OS_VXWORKS) } else if (h_errno == HOST_NOT_FOUND || h_errno == NO_DATA || h_errno == NO_ADDRESS) { results.setError(QHostInfo::HostNotFound); results.setErrorString(tr("Host not found")); #endif } else { results.setError(QHostInfo::UnknownError); results.setErrorString(tr("Unknown error")); } #endif // !defined (QT_NO_GETADDRINFO) #if defined(QHOSTINFO_DEBUG) if (results.error() != QHostInfo::NoError) { qDebug("QHostInfoAgent::fromName(): error #%d %s", h_errno, results.errorString().toLatin1().constData()); } else { QString tmp; QList addresses = results.addresses(); for (int i = 0; i < addresses.count(); ++i) { if (i != 0) tmp += ", "; tmp += addresses.at(i).toString(); } qDebug("QHostInfoAgent::fromName(): found %i entries for \"%s\": {%s}", addresses.count(), hostName.toLatin1().constData(), tmp.toLatin1().constData()); } #endif return results; } QString QHostInfo::localHostName() { char hostName[512]; if (gethostname(hostName, sizeof(hostName)) == -1) return QString(); hostName[sizeof(hostName) - 1] = '\0'; return QString::fromLocal8Bit(hostName); } QString QHostInfo::localDomainName() { #if !defined(Q_OS_VXWORKS) resolveLibrary(); if (local_res_ninit) { // using thread-safe version res_state_ptr state = res_state_ptr(qMalloc(sizeof(*state))); Q_CHECK_PTR(state); memset(state, 0, sizeof(*state)); local_res_ninit(state); QString domainName = QUrl::fromAce(state->defdname); if (domainName.isEmpty()) domainName = QUrl::fromAce(state->dnsrch[0]); local_res_nclose(state); qFree(state); return domainName; } if (local_res_init && local_res) { // using thread-unsafe version #if defined(QT_NO_GETADDRINFO) // We have to call res_init to be sure that _res was initialized // So, for systems without getaddrinfo (which is thread-safe), we lock the mutex too QMutexLocker locker(::getHostByNameMutex()); #endif local_res_init(); QString domainName = QUrl::fromAce(local_res->defdname); if (domainName.isEmpty()) domainName = QUrl::fromAce(local_res->dnsrch[0]); return domainName; } #endif // nothing worked, try doing it by ourselves: QFile resolvconf; #if defined(_PATH_RESCONF) resolvconf.setFileName(QFile::decodeName(_PATH_RESCONF)); #else resolvconf.setFileName(QLatin1String("/etc/resolv.conf")); #endif if (!resolvconf.open(QIODevice::ReadOnly)) return QString(); // failure QString domainName; while (!resolvconf.atEnd()) { QByteArray line = resolvconf.readLine().trimmed(); if (line.startsWith("domain ")) return QUrl::fromAce(line.mid(sizeof "domain " - 1).trimmed()); // in case there's no "domain" line, fall back to the first "search" entry if (domainName.isEmpty() && line.startsWith("search ")) { QByteArray searchDomain = line.mid(sizeof "search " - 1).trimmed(); int pos = searchDomain.indexOf(' '); if (pos != -1) searchDomain.truncate(pos); domainName = QUrl::fromAce(searchDomain); } } // return the fallen-back-to searched domain return domainName; } QT_END_NAMESPACE