DNS::HostMap DNS::resolve( const std::string& service, const std::string& proto,
const std::string& domain, const LogSink& logInstance )
{
logInstance.warn( LogAreaClassDns, "notice: gloox does not support SRV "
"records on this platform. Using A records instead." );
return defaultHostMap( domain, logInstance );
}
DNS::HostMap DNS::resolve( const std::string& service, const std::string& proto,
const std::string& domain, const LogSink& logInstance )
{
const std::string dname = "_" + service + "._" + proto + "." + domain;
bool error = false;
DNS::HostMap servers;
DNS_RECORD* pRecord;
if( DnsQuery( dname.c_str(), DNS_TYPE_SRV, DNS_QUERY_STANDARD, NULL, &pRecord, NULL ) == ERROR_SUCCESS )
{
DNS_RECORD* pRec = pRecord;
do
{
if( pRec->wType == DNS_TYPE_SRV )
{
servers[pRec->Data.SRV.pNameTarget] = pRec->Data.SRV.wPort;
}
pRec = pRec->pNext;
}
while( pRec != NULL );
DnsRecordListFree( pRecord, DnsFreeRecordList );
}
else
error = true;
if( error || !servers.size() )
{
servers = defaultHostMap( domain, logInstance );
}
return servers;
}
DNS::HostMap DNS::resolve( const std::string& service, const std::string& proto,
const std::string& domain, const LogSink& logInstance )
{
const std::string dname = "_" + service + "._" + proto + "." + domain;
bool error = false;
DNS::HostMap servers;
DNS_RECORD* pRecord = NULL;
DNS_STATUS status = DnsQuery_UTF8( dname.c_str(), DNS_TYPE_SRV, DNS_QUERY_STANDARD, NULL, &pRecord, NULL );
if( status == ERROR_SUCCESS )
{
// NOTE: DnsQuery_UTF8 and DnsQuery_A really should have been defined with
// PDNS_RECORDA instead of PDNS_RECORD, since that's what it is (even with _UNICODE defined).
// We'll correct for that mistake with a cast.
DNS_RECORDA* pRec = (DNS_RECORDA*)pRecord;
do
{
if( pRec->wType == DNS_TYPE_SRV )
{
servers[pRec->Data.SRV.pNameTarget] = pRec->Data.SRV.wPort;
}
pRec = pRec->pNext;
}
while( pRec != NULL );
DnsRecordListFree( pRecord, DnsFreeRecordList );
}
else
{
logInstance.warn( LogAreaClassDns, "DnsQuery_UTF8() failed: " + util::int2string( status ) );
error = true;
}
if( error || !servers.size() )
{
servers = defaultHostMap( domain, logInstance );
}
return servers;
}
DNS::HostMap DNS::resolve( const std::string& service, const std::string& proto,
const std::string& domain, const LogSink& logInstance )
{
buffer srvbuf;
bool error = false;
const std::string dname = "_" + service + "._" + proto;
if( !domain.empty() )
srvbuf.len = res_querydomain( dname.c_str(), const_cast<char*>( domain.c_str() ),
C_IN, T_SRV, srvbuf.buf, NS_PACKETSZ );
else
srvbuf.len = res_query( dname.c_str(), C_IN, T_SRV, srvbuf.buf, NS_PACKETSZ );
if( srvbuf.len < 0 )
return defaultHostMap( domain, logInstance );
HEADER* hdr = (HEADER*)srvbuf.buf;
unsigned char* here = srvbuf.buf + NS_HFIXEDSZ;
if( ( hdr->tc ) || ( srvbuf.len < NS_HFIXEDSZ ) )
error = true;
if( hdr->rcode >= 1 && hdr->rcode <= 5 )
error = true;
if( ntohs( hdr->ancount ) == 0 )
error = true;
if( ntohs( hdr->ancount ) > NS_PACKETSZ )
error = true;
int cnt;
for( cnt = ntohs( hdr->qdcount ); cnt>0; --cnt )
{
int strlen = dn_skipname( here, srvbuf.buf + srvbuf.len );
here += strlen + NS_QFIXEDSZ;
}
unsigned char* srv[NS_PACKETSZ];
int srvnum = 0;
for( cnt = ntohs( hdr->ancount ); cnt>0; --cnt )
{
int strlen = dn_skipname( here, srvbuf.buf + srvbuf.len );
here += strlen;
srv[srvnum++] = here;
here += SRV_FIXEDSZ;
here += dn_skipname( here, srvbuf.buf + srvbuf.len );
}
if( error )
{
return defaultHostMap( domain, logInstance );
}
// (q)sort here
HostMap servers;
for( cnt=0; cnt<srvnum; ++cnt )
{
name srvname;
if( ns_name_ntop( srv[cnt] + SRV_SERVER, (char*)srvname, NS_MAXDNAME ) < 0 )
printf( "handle this error!\n" );
servers[(char*)srvname] = ns_get16( srv[cnt] + SRV_PORT );
}
return servers;
}
DNS::HostMap DNS::resolve( const std::string& service, const std::string& proto,
const std::string& domain, const LogSink& logInstance )
{
buffer srvbuf;
bool error = false;
const std::string dname = "_" + service + "._" + proto;
if( !domain.empty() )
srvbuf.len = res_querydomain( dname.c_str(), const_cast<char*>( domain.c_str() ),
C_IN, T_SRV, srvbuf.buf, NS_PACKETSZ );
else
srvbuf.len = res_query( dname.c_str(), C_IN, T_SRV, srvbuf.buf, NS_PACKETSZ );
if( srvbuf.len < 0 )
return defaultHostMap( domain, logInstance );
HEADER* hdr = (HEADER*)srvbuf.buf;
unsigned char* here = srvbuf.buf + NS_HFIXEDSZ;
if( srvbuf.len < NS_HFIXEDSZ )
error = true;
if( hdr->rcode >= 1 && hdr->rcode <= 5 )
error = true;
if( ntohs( hdr->ancount ) == 0 )
error = true;
if( ntohs( hdr->ancount ) > NS_PACKETSZ )
error = true;
int cnt;
for( cnt = ntohs( hdr->qdcount ); cnt > 0; --cnt )
{
int strlen = dn_skipname( here, srvbuf.buf + srvbuf.len );
here += strlen + NS_QFIXEDSZ;
}
unsigned char* srv[NS_PACKETSZ];
int srvnum = 0;
for( cnt = ntohs( hdr->ancount ); cnt > 0; --cnt )
{
int strlen = dn_skipname( here, srvbuf.buf + srvbuf.len );
here += strlen;
srv[srvnum++] = here;
here += SRV_FIXEDSZ;
here += dn_skipname( here, srvbuf.buf + srvbuf.len );
}
if( error )
{
return defaultHostMap( domain, logInstance );
}
// (q)sort here
HostMap servers;
for( cnt = 0; cnt < srvnum; ++cnt )
{
char srvname[NS_MAXDNAME];
srvname[0] = '\0';
if( dn_expand( srvbuf.buf, srvbuf.buf + NS_PACKETSZ,
srv[cnt] + SRV_SERVER, srvname, NS_MAXDNAME ) < 0
|| !(*srvname) )
continue;
unsigned char* c = srv[cnt] + SRV_PORT;
servers.insert( std::make_pair( (char*)srvname, ntohs( c[1] << 8 | c[0] ) ) );
}
if( !servers.size() )
return defaultHostMap( domain, logInstance );
return servers;
}
