diff options
Diffstat (limited to 'src/network/kernel/qhostinfo_unix.cpp')
| -rw-r--r-- | src/network/kernel/qhostinfo_unix.cpp | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/src/network/kernel/qhostinfo_unix.cpp b/src/network/kernel/qhostinfo_unix.cpp new file mode 100644 index 0000000000..8fc6bf6504 --- /dev/null +++ b/src/network/kernel/qhostinfo_unix.cpp @@ -0,0 +1,396 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** 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 "private/qnativesocketengine_p.h" +#include "qiodevice.h" +#include <qbytearray.h> +#include <qlibrary.h> +#include <qurl.h> +#include <qfile.h> +#include <private/qmutexpool_p.h> +#include <private/qnet_unix_p.h> + +#include <sys/types.h> +#include <netdb.h> +#include <arpa/inet.h> +#if defined(Q_OS_VXWORKS) +# include <hostLib.h> +#else +# include <resolv.h> +#endif + +#if defined (QT_NO_GETADDRINFO) +#include <qmutex.h> +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) { + QMutexLocker locker(QMutexPool::globalInstanceGet(&local_res_init)); + 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) + 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.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.setHostName(QString::fromLatin1(ent->h_name)); +#endif + + if (results.hostName().isEmpty()) + results.setHostName(address.toString()); + results.setAddresses(QList<QHostAddress>() << address); + return results; + } + + // IDN support + QByteArray aceHostname = QUrl::toAce(hostName); + results.setHostName(hostName); + if (aceHostname.isEmpty()) { + results.setError(QHostInfo::HostNotFound); + results.setErrorString(hostName.isEmpty() ? + QCoreApplication::translate("QHostInfoAgent", "No host name given") : + QCoreApplication::translate("QHostInfoAgent", "Invalid hostname")); + return results; + } + +#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<QHostAddress> addresses; + while (node) { +#ifdef QHOSTINFO_DEBUG + qDebug() << "getaddrinfo node: flags:" << node->ai_flags << "family:" << node->ai_family << "ai_socktype:" << node->ai_socktype << "ai_protocol:" << node->ai_protocol << "ai_addrlen:" << node->ai_addrlen; +#endif + 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; + sockaddr_in6 *sa6 = (sockaddr_in6 *) node->ai_addr; + addr.setAddress(sa6->sin6_addr.s6_addr); + if (sa6->sin6_scope_id) + addr.setScopeId(QString::number(sa6->sin6_scope_id)); + 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<QHostAddress> 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<QHostAddress> 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 |