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
}
static void resolveLibrary()
{
#if !defined(QT_NO_LIBRARY) && !defined(Q_OS_QNX)
QLibrary lib(QLatin1String("resolv"));
lib.setLoadHints(QLibrary::ImprovedSearchHeuristics);
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
}
QString QHostInfo::localDomainName()
{
#if !defined(Q_OS_VXWORKS) && !defined(Q_OS_ANDROID)
resolveLibrary();
if (local_res_ninit) {
// using thread-safe version
res_state_ptr state = res_state_ptr(malloc(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);
free(state);
return domainName;
}
if (local_res_init && local_res) {
// using thread-unsafe version
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;
}
static bool resolveLibraryInternal()
{
#if QT_CONFIG(library) && !defined(Q_OS_QNX)
QLibrary lib;
#ifdef LIBRESOLV_SO
lib.setFileName(QStringLiteral(LIBRESOLV_SO));
if (!lib.load())
#endif
{
lib.setFileName(QLatin1String("resolv"));
if (!lib.load())
return false;
}
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
return true;
}
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;
}