/*++
Copyright (c) 1996-2001 Microsoft Corporation
Module Name:
straddr.c
Abstract:
Domain Name System (DNS) Library
Routines to string to\from address conversions.
Author:
Jim Gilroy (jamesg) December 1996
Revision History:
jamesg June 2000 New IP6 parsing.
jamesg Oct 2000 Created this module.
--*/
#include "local.h"
#include "ws2tcpip.h" // IP6 inaddr definitions
//
// String to address
//
BOOL
Dns_Ip6StringToAddress_A(
OUT PIP6_ADDRESS pIp6Addr,
IN PCSTR pString
)
/*++
Routine Description:
Convert string to IP6 address.
Arguments:
pAddress -- ptr to IP6 address to be filled in
pString -- string with IP6 address
Return Value:
TRUE if successful.
FALSE otherwise.
--*/
{
DNS_STATUS status;
PCHAR pstringEnd = NULL;
DNSDBG( PARSE2, (
"Dns_Ip6StringToAddress_A( %s )\n",
pString ));
//
// convert to IP6 address
//
status = RtlIpv6StringToAddressA(
pString,
& pstringEnd,
(PIN6_ADDR) pIp6Addr );
return( status == NO_ERROR && *pstringEnd==0 );
}
BOOL
Dns_Ip6StringToAddressEx_A(
OUT PIP6_ADDRESS pIp6Addr,
IN PCSTR pchString,
IN DWORD dwStringLength
)
/*++
Routine Description:
Convert string to IP6 address.
This version handles non-NULL-terminated strings
for DNS server file load.
Arguments:
pAddress -- ptr to IP6 address to be filled in
pchString -- string with IP6 address
dwStringLength -- string length
Return Value:
TRUE if successful.
FALSE otherwise.
--*/
{
CHAR tempBuf[ IP6_ADDRESS_STRING_BUFFER_LENGTH ];
PCSTR pstring;
DNSDBG( PARSE2, (
"Dns_Ip6StringToAddressEx_A( %.*s )\n"
"\tpchString = %p\n",
dwStringLength,
pchString,
pchString ));
//
// copy string if given length
// if no length assume NULL terminated
//
pstring = pchString;
if ( dwStringLength )
{
DWORD bufLength = IP6_ADDRESS_STRING_BUFFER_LENGTH;
if ( ! Dns_StringCopy(
tempBuf,
& bufLength,
(PCHAR) pstring,
dwStringLength,
DnsCharSetAnsi,
DnsCharSetAnsi ) )
{
return( FALSE );
}
pstring = tempBuf;
}
// convert to IP6 address
return Dns_Ip6StringToAddress_A(
pIp6Addr,
pstring );
}
BOOL
Dns_Ip6StringToAddress_W(
OUT PIP6_ADDRESS pIp6Addr,
IN PCWSTR pwString
)
/*++
Routine Description:
Build IP6 address from wide string.
Arguments:
pwString -- unicode IP6 string
pIp6Addr -- addr to recv IP6 address
Return Value:
TRUE if successful conversion.
FALSE on bad string.
--*/
{
DNS_STATUS status;
PWCHAR pstringEnd = NULL;
DNSDBG( PARSE2, (
"Dns_Ip6StringToAddress_W( %S )\n",
pwString ));
//
// convert to IP6 address
//
status = RtlIpv6StringToAddressW(
pwString,
& pstringEnd,
(PIN6_ADDR) pIp6Addr );
return( status == NO_ERROR && *pstringEnd==0 );
}
BOOL
Dns_Ip4StringToAddress_A(
OUT PIP4_ADDRESS pIp4Addr,
IN PCSTR pString
)
/*++
Routine Description:
Build IP4 address from narrow string.
Arguments:
pIp4Addr -- addr to recv IP6 address
pString -- unicode IP4 string
Return Value:
TRUE if successful conversion.
FALSE on bad string.
--*/
{
IP4_ADDRESS ip;
// if inet_addr() returns error, verify then error out
ip = inet_addr( pString );
if ( ip == INADDR_BROADCAST &&
strcmp( pString, "255.255.255.255" ) != 0 )
{
return( FALSE );
}
*pIp4Addr = ip;
return( TRUE );
}
BOOL
Dns_Ip4StringToAddressEx_A(
OUT PIP4_ADDRESS pIp4Addr,
IN PCSTR pchString,
IN DWORD dwStringLength
)
/*++
Routine Description:
Build IP4 address from narrow string.
This version handles non-NULL terminated strings
Arguments:
pIp4Addr -- addr to recv IP6 address
pString -- unicode IP4 string
dwStringLength -- string length; 0 if NULL terminated
Return Value:
TRUE if successful conversion.
FALSE on bad string.
--*/
{
CHAR tempBuf[ IP4_ADDRESS_STRING_BUFFER_LENGTH ];
PCSTR pstring;
DNSDBG( PARSE2, (
"Dns_Ip4StringToAddressEx_A( %.*s )\n"
"\tpchString = %p\n",
dwStringLength,
pchString,
pchString ));
//
// copy string if given length
// if no length assume NULL terminated
//
pstring = pchString;
if ( dwStringLength )
{
DWORD bufLength = IP4_ADDRESS_STRING_BUFFER_LENGTH;
if ( ! Dns_StringCopy(
tempBuf,
& bufLength,
(PCHAR) pstring,
dwStringLength,
DnsCharSetAnsi,
DnsCharSetAnsi ) )
{
return( FALSE );
}
pstring = tempBuf;
}
return Dns_Ip4StringToAddress_A(
pIp4Addr,
pstring );
}
BOOL
Dns_Ip4StringToAddress_W(
OUT PIP4_ADDRESS pIp4Addr,
IN PCWSTR pwString
)
/*++
Routine Description:
Build IP4 address from wide string.
Arguments:
pIp4Addr -- addr to recv IP6 address
pwString -- unicode IP6 string
Return Value:
TRUE if successful conversion.
FALSE on bad string.
--*/
{
CHAR bufAddr[ IP4_ADDRESS_STRING_BUFFER_LENGTH ];
DWORD bufLength = IP4_ADDRESS_STRING_BUFFER_LENGTH;
// convert to narrow string
// - UTF8 quicker and just fine for numeric
if ( ! Dns_StringCopy(
bufAddr,
& bufLength,
(PCHAR) pwString,
0, // length unknown
DnsCharSetUnicode,
DnsCharSetUtf8
) )
{
return( FALSE );
}
return Dns_Ip4StringToAddress_A(
pIp4Addr,
bufAddr );
}
//
// Combined IP4/IP6 string-to-address
//
BOOL
Dns_StringToAddress_W(
OUT PCHAR pAddrBuf,
IN OUT PDWORD pBufLength,
IN PCWSTR pString,
IN OUT PDWORD pAddrFamily
)
/*++
Routine Description:
Build address (IP4 or IP6) from address string.
Arguments:
pAddrBuf -- buffer to receive address
pBufLength -- ptr to address length
input - length of buffer
output - length of address found
pString -- address string
pAddrFamily -- ptr to address family
input - zero for any family or particular family to check
output - family found; zero if no conversion
Return Value:
TRUE if successful.
FALSE on error. GetLastError() for status.
--*/
{
return Dns_StringToAddressEx(
pAddrBuf,
pBufLength,
(PCSTR) pString,
pAddrFamily,
TRUE, // unicode
FALSE // forward
);
}
BOOL
Dns_StringToAddress_A(
OUT PCHAR pAddrBuf,
IN OUT PDWORD pBufLength,
IN PCSTR pString,
IN OUT PDWORD pAddrFamily
)
{
return Dns_StringToAddressEx(
pAddrBuf,
pBufLength,
pString,
pAddrFamily,
FALSE, // ANSI
FALSE // forward
);
}
//
// Address to string
//
PWCHAR
Dns_Ip6AddressToString_W(
OUT PWCHAR pwString,
IN PIP6_ADDRESS pIp6Addr
)
/*++
Routine Description:
Convert IP6 address to string format.
Arguments:
pwString -- buffer to hold string; MUST be at least
IPV6_ADDRESS_STRING_LENGTH+1 in length
pAddress -- IP6 address to convert to string
Return Value:
Ptr to next location in buffer (the terminating NULL).
--*/
{
// DCR: could be macro
return RtlIpv6AddressToStringW(
(PIN6_ADDR) pIp6Addr,
pwString );
}
PCHAR
Dns_Ip6AddressToString_A(
OUT PCHAR pchString,
IN PIP6_ADDRESS pIp6Addr
)
/*++
Routine Description:
Convert IP6 address to string format.
Arguments:
pchString -- buffer to hold string; MUST be at least
IPV6_ADDRESS_STRING_LENGTH+1 in length
pAddress -- IP6 address to convert to string
Return Value:
Ptr to next location in buffer (the terminating NULL).
--*/
{
// DCR: could be macro
return RtlIpv6AddressToStringA(
(PIN6_ADDR) pIp6Addr,
pchString );
}
//
// Address to string -- IP4
//
PWCHAR
Dns_Ip4AddressToString_W(
OUT PWCHAR pwString,
IN PIP4_ADDRESS pIp4Addr
)
/*++
Routine Description:
Convert IP4 address to string format.
Arguments:
pwString -- buffer to hold string; MUST be at least
IPV6_ADDRESS_STRING_LENGTH+1 in length
pAddress -- IP4 address to convert to string
Return Value:
Ptr to next location in buffer (the terminating NULL).
--*/
{
IP4_ADDRESS ip = *pIp4Addr;
//
// convert IP4 address to string
// - address is in net order, lead byte in low memory
//
pwString += wsprintfW(
pwString,
L"%u.%u.%u.%u",
(UCHAR) (ip & 0x000000ff),
(UCHAR) ((ip & 0x0000ff00) >> 8),
(UCHAR) ((ip & 0x00ff0000) >> 16),
(UCHAR) ((ip & 0xff000000) >> 24)
);
return( pwString );
}
PCHAR
Dns_Ip4AddressToString_A(
OUT PCHAR pString,
IN PIP4_ADDRESS pIp4Addr
)
/*++
Routine Description:
Convert IP4 address to string format.
Arguments:
pchString -- buffer to hold string; MUST be at least
IPV6_ADDRESS_STRING_LENGTH+1 in length
pAddress -- IP4 address to convert to string
Return Value:
Ptr to next location in buffer (the terminating NULL).
--*/
{
IP4_ADDRESS ip = *pIp4Addr;
//
// convert IP4 address to string
// - address is in net order, lead byte in low memory
//
pString += sprintf(
pString,
"%u.%u.%u.%u",
(UCHAR) (ip & 0x000000ff),
(UCHAR) ((ip & 0x0000ff00) >> 8),
(UCHAR) ((ip & 0x00ff0000) >> 16),
(UCHAR) ((ip & 0xff000000) >> 24)
);
return( pString );
}
//
// Address-to-string -- combined IP4/6
//
PCHAR
Dns_AddressToString_A(
OUT PCHAR pchString,
IN OUT PDWORD pStringLength,
IN PBYTE pAddr,
IN DWORD AddrLength,
IN DWORD AddrFamily
)
/*++
Routine Description:
Convert address to string format.
Arguments:
pchString -- buffer to hold string; MUST be at least
IPV6_ADDRESS_STRING_LENGTH+1 in length
pStringLength -- string buffer length
pAddr -- ptr to address
AddrLength -- address length
AddrFamily -- address family (AF_INET, AF_INET6)
Return Value:
Ptr to next location in buffer (the terminating NULL).
NULL if no conversion.
--*/
{
DWORD length = *pStringLength;
// dispatch to conversion routine for this type
if ( AddrFamily == AF_INET )
{
if ( length < IP_ADDRESS_STRING_LENGTH+1 )
{
length = IP_ADDRESS_STRING_LENGTH+1;
goto Failed;
}
return Dns_Ip4AddressToString_A(
pchString,
(PIP4_ADDRESS) pAddr );
}
if ( AddrFamily == AF_INET6 )
{
if ( length < IP6_ADDRESS_STRING_LENGTH+1 )
{
length = IP6_ADDRESS_STRING_LENGTH+1;
goto Failed;
}
return Dns_Ip6AddressToString_A(
pchString,
(PIP6_ADDRESS) pAddr );
}
Failed:
*pStringLength = length;
return NULL;
}
//
// Reverse lookup address-to-name IP4
//
PCHAR
Dns_Ip4AddressToReverseName_A(
OUT PCHAR pBuffer,
IN IP_ADDRESS IpAddress
)
/*++
Routine Description:
Write reverse lookup name, given corresponding IP
Arguments:
pBuffer -- ptr to buffer for reverse lookup name;
MUST contain at least DNS_MAX_REVERSE_NAME_BUFFER_LENGTH bytes
IpAddress -- IP address to create
Return Value:
Ptr to next location in buffer.
--*/
{
DNSDBG( TRACE, ( "Dns_Ip4AddressToReverseName_A()\n" ));
//
// write digits for each octect in IP address
// - note, it is in net order so lowest octect, is in highest memory
//
pBuffer += sprintf(
pBuffer,
"%u.%u.%u.%u.in-addr.arpa.",
(UCHAR) ((IpAddress & 0xff000000) >> 24),
(UCHAR) ((IpAddress & 0x00ff0000) >> 16),
(UCHAR) ((IpAddress & 0x0000ff00) >> 8),
(UCHAR) (IpAddress & 0x000000ff) );
return( pBuffer );
}
PWCHAR
Dns_Ip4AddressToReverseName_W(
OUT PWCHAR pBuffer,
IN IP_ADDRESS IpAddress
)
/*++
Routine Description:
Write reverse lookup name, given corresponding IP
Arguments:
pBuffer -- ptr to buffer for reverse lookup name;
MUST contain at least DNS_MAX_REVERSE_NAME_BUFFER_LENGTH wide chars
IpAddress -- IP address to create
Return Value:
Ptr to next location in buffer.
--*/
{
DNSDBG( TRACE, ( "Dns_Ip4AddressToReverseName_W()\n" ));
//
// write digits for each octect in IP address
// - note, it is in net order so lowest octect, is in highest memory
//
pBuffer += wsprintfW(
pBuffer,
L"%u.%u.%u.%u.in-addr.arpa.",
(UCHAR) ((IpAddress & 0xff000000) >> 24),
(UCHAR) ((IpAddress & 0x00ff0000) >> 16),
(UCHAR) ((IpAddress & 0x0000ff00) >> 8),
(UCHAR) (IpAddress & 0x000000ff) );
return( pBuffer );
}
PCHAR
Dns_Ip4AddressToReverseNameAlloc_A(
IN IP_ADDRESS IpAddress
)
/*++
Routine Description:
Create reverse lookup name string, given corresponding IP.
Caller must free the string.
Arguments:
IpAddress -- IP address to create
Return Value:
Ptr to new reverse lookup string.
--*/
{
PCHAR pch;
PCHAR pchend;
DNSDBG( TRACE, ( "Dns_Ip4AddressToReverseNameAlloc_A()\n" ));
//
// allocate space for string
//
pch = ALLOCATE_HEAP( DNS_MAX_REVERSE_NAME_BUFFER_LENGTH );
if ( !pch )
{
return( NULL );
}
//
// write string for IP
//
pchend = Dns_Ip4AddressToReverseName_A( pch, IpAddress );
if ( !pchend )
{
FREE_HEAP( pch );
return( NULL );
}
return( pch );
}
PWCHAR
Dns_Ip4AddressToReverseNameAlloc_W(
IN IP_ADDRESS IpAddress
)
/*++
Routine Description:
Create reverse lookup name string, given corresponding IP.
Caller must free the string.
Arguments:
IpAddress -- IP address to create
Return Value:
Ptr to new reverse lookup string.
--*/
{
PWCHAR pch;
PWCHAR pchend;
DNSDBG( TRACE, ( "Dns_Ip4AddressToReverseNameAlloc_W()\n" ));
//
// allocate space for string
//
pch = ALLOCATE_HEAP( DNS_MAX_REVERSE_NAME_BUFFER_LENGTH * sizeof(WCHAR) );
if ( !pch )
{
return( NULL );
}
//
// write string for IP
//
pchend = Dns_Ip4AddressToReverseName_W( pch, IpAddress );
if ( !pchend )
{
FREE_HEAP( pch );
return( NULL );
}
return( pch );
}
//
// Reverse lookup address-to-name -- IP6
//
PCHAR
Dns_Ip6AddressToReverseName_A(
OUT PCHAR pBuffer,
IN IP6_ADDRESS Ip6Addr
)
/*++
Routine Description:
Write reverse lookup name, given corresponding IP6 address
Arguments:
pBuffer -- ptr to buffer for reverse lookup name;
MUST contain at least DNS_MAX_IP6_REVERSE_NAME_BUFFER_LENGTH bytes
Ip6Addr -- IP6 address to create reverse string for
Return Value:
Ptr to next location in buffer.
--*/
{
DWORD i;
DNSDBG( TRACE, ( "Dns_Ip6AddressToReverseName_A()\n" ));
//
// write digit for each nibble in IP6 address
//
// note we are reversing net order here
// since address is in net order and we are filling
// in least to most significant order
// - go DOWN through DWORDS
// - go DOWN through the BYTES
// - but we must put the lowest (least significant) nibble
// first as our bits are not in "bit net order"
// which is sending the highest bit in the byte first
//
#if 0
i = 4;
while ( i-- )
{
DWORD thisDword = Ip6Address.IP6Dword[i];
pBuffer += sprintf(
pBuffer,
"%u.%u.%u.%u.%u.%u.%u.%u.",
(thisDword & 0x0f000000) >> 24,
(thisDword & 0xf0000000) >> 28,
(thisDword & 0x000f0000) >> 16,
(thisDword & 0x00f00000) >> 20,
(thisDword & 0x00000f00) >> 8,
(thisDword & 0x0000f000) >> 12,
(thisDword & 0x0000000f) ,
(thisDword & 0x000000f0) >> 4
);
}
#endif
i = 16;
while ( i-- )
{
BYTE thisByte = Ip6Addr.IP6Byte[i];
pBuffer += sprintf(
pBuffer,
"%x.%x.",
(thisByte & 0x0f),
(thisByte & 0xf0) >> 4
);
}
pBuffer += sprintf(
pBuffer,
"ip6.int." );
return( pBuffer );
}
PWCHAR
Dns_Ip6AddressToReverseName_W(
OUT PWCHAR pBuffer,
IN IP6_ADDRESS Ip6Addr
)
/*++
Routine Description:
Write reverse lookup name, given corresponding IP6 address
Arguments:
pBuffer -- ptr to buffer for reverse lookup name;
MUST contain at least DNS_MAX_IP6_REVERSE_NAME_BUFFER_LENGTH wide chars
Ip6Addr -- IP6 address to create reverse string for
Return Value:
Ptr to next location in buffer.
--*/
{
DWORD i;
DNSDBG( TRACE, ( "Dns_Ip6AddressToReverseName_W()\n" ));
//
// write digit for each nibble in IP6 address
// - in net order so lowest nibble is in highest memory
//
i = 16;
while ( i-- )
{
BYTE thisByte = Ip6Addr.IP6Byte[i];
pBuffer += wsprintfW(
pBuffer,
L"%x.%x.",
(thisByte & 0x0f),
(thisByte & 0xf0) >> 4
);
}
pBuffer += wsprintfW(
pBuffer,
L"ip6.int." );
return( pBuffer );
}
PCHAR
Dns_Ip6AddressToReverseNameAlloc_A(
IN IP6_ADDRESS Ip6Addr
)
/*++
Routine Description:
Create reverse lookup name given corresponding IP.
Caller must free the string.
Arguments:
Ip6Addr -- IP6 address to create reverse name for
Return Value:
Ptr to new reverse lookup name string.
--*/
{
PCHAR pch;
PCHAR pchend;
DNSDBG( TRACE, ( "Dns_Ip6AddressToReverseNameAlloc_A()\n" ));
//
// allocate space for string
//
pch = ALLOCATE_HEAP( DNS_MAX_IP6_REVERSE_NAME_BUFFER_LENGTH );
if ( !pch )
{
return( NULL );
}
//
// write string for IP
//
pchend = Dns_Ip6AddressToReverseName_A( pch, Ip6Addr );
if ( !pchend )
{
FREE_HEAP( pch );
return( NULL );
}
return( pch );
}
PWCHAR
Dns_Ip6AddressToReverseNameAlloc_W(
IN IP6_ADDRESS Ip6Addr
)
/*++
Routine Description:
Create reverse lookup name given corresponding IP.
Caller must free the string.
Arguments:
Ip6Addr -- IP6 address to create reverse name for
Return Value:
Ptr to new reverse lookup name string.
--*/
{
PWCHAR pch;
PWCHAR pchend;
DNSDBG( TRACE, ( "Dns_Ip6AddressToReverseNameAlloc_W()\n" ));
//
// allocate space for string
//
pch = (PWCHAR) ALLOCATE_HEAP(
DNS_MAX_IP6_REVERSE_NAME_BUFFER_LENGTH * sizeof(WCHAR) );
if ( !pch )
{
return( NULL );
}
//
// write string for IP
//
pchend = Dns_Ip6AddressToReverseName_W( pch, Ip6Addr );
if ( !pchend )
{
FREE_HEAP( pch );
return( NULL );
}
return( pch );
}
//
// Reverse name-to-address -- IP4
//
BOOL
Dns_Ip4ReverseNameToAddress_A(
OUT PIP4_ADDRESS pIp4Addr,
IN PCSTR pszName
)
/*++
Routine Description:
Get IP for reverse lookup name.
Arguments:
pIp4Addr -- addr to receive IP address if found
pszName -- name to lookup
Return Value:
TRUE -- if reverse lookup name converted to IP
FALSE -- if not IP4 reverse lookup name
--*/
{
#define SIZE_IP4REV (sizeof(".in-addr.arpa")-1)
CHAR nameBuffer[ DNS_MAX_IP4_REVERSE_NAME_BUFFER_LENGTH+1 ];
DWORD nameLength;
IP_ADDRESS ip;
PCHAR pch;
DWORD i;
DWORD byte;
DNSDBG( TRACE, (
"Dns_Ip4ReverseNameToAddress_A( %s )\n",
pszName ));
//
// validate name
// fail if
// - too long
// - too short
// - not in in-addr.arpa domain
//
nameLength = strlen( pszName );
if ( nameLength > DNS_MAX_IP4_REVERSE_NAME_BUFFER_LENGTH )
{
return( FALSE );
}
if ( pszName[nameLength-1] == '.' )
{
nameLength--;
}
if ( nameLength <= SIZE_IP4REV )
{
return( FALSE );
}
nameLength -= SIZE_IP4REV;
if ( _strnicmp( ".in-addr.arpa", &pszName[nameLength], SIZE_IP4REV ) != 0 )
{
return( FALSE );
}
//
// copy reverse dotted decimal piece of name
//
RtlCopyMemory(
nameBuffer,
pszName,
nameLength );
nameBuffer[nameLength] = 0;
//
// read digits
//
ip = 0;
i = 0;
pch = nameBuffer + nameLength;
while ( 1 )
{
--pch;
if ( *pch == '.' )
{
*pch = 0;
pch++;
}
else if ( pch == nameBuffer )
{
}
else
{
continue;
}
// convert byte
byte = strtoul( pch, NULL, 10 );
if ( byte > 255 )
{
return( FALSE );
}
if ( i > 3 )
{
return( FALSE );
}
ip |= byte << (8*i);
// terminate at string beginning
// or continue back up string
if ( pch == nameBuffer )
{
break;
}
i++;
pch--;
}
*pIp4Addr = ip;
DNSDBG( TRACE, (
"Success on Dns_Ip4ReverseNameToAddress_A( %s ) => %s\n",
pszName,
IP_STRING(ip) ));
return( TRUE );
}
BOOL
Dns_Ip4ReverseNameToAddress_W(
OUT PIP4_ADDRESS pIp4Addr,
IN PCWSTR pwsName
)
/*++
Routine Description:
Get IP for reverse lookup name.
Arguments:
pIp4Addr -- addr to receive IP address if found
pszName -- name to lookup
Return Value:
TRUE -- if reverse lookup name converted to IP
FALSE -- if not IP4 reverse lookup name
--*/
{
CHAR nameBuffer[ DNS_MAX_IP4_REVERSE_NAME_BUFFER_LENGTH+1 ];
DWORD bufLength;
DWORD nameLengthUtf8;
DNSDBG( TRACE, (
"Dns_Ip4ReverseNameToAddress_W( %S )\n",
pwsName ));
//
// convert to UTF8
// - use UTF8 since conversion to it is trivial and it
// is identical to ANSI for all reverse lookup names
//
bufLength = DNS_MAX_IP4_REVERSE_NAME_BUFFER_LENGTH + 1;
nameLengthUtf8 = Dns_StringCopy(
nameBuffer,
& bufLength,
(PCHAR) pwsName,
0, // NULL terminated
DnsCharSetUnicode,
DnsCharSetUtf8 );
if ( nameLengthUtf8 == 0 )
{
return FALSE;
}
//
// call ANSI routine to do conversion
//
return Dns_Ip4ReverseNameToAddress_A(
pIp4Addr,
(PCSTR) nameBuffer );
}
//
// Reverse name-to-address -- IP6
//
BOOL
Dns_Ip6ReverseNameToAddress_A(
OUT PIP6_ADDRESS pIp6Addr,
IN PCSTR pszName
)
/*++
Routine Description:
Get IP6 address for reverse lookup name.
Arguments:
pIp6Addr -- addr to receive IP address if found
pszName -- name to lookup
Return Value:
TRUE -- if reverse lookup name converted to IP
FALSE -- if not IP4 reverse lookup name
--*/
{
#define SIZE_IP6REV (sizeof(".ip6.int")-1)
CHAR nameBuffer[ DNS_MAX_IP6_REVERSE_NAME_BUFFER_LENGTH+1 ];
DWORD nameLength;
PCHAR pch;
BYTE byteArray[16];
DWORD byteCount;
DWORD nibble;
DWORD highNibble;
BOOL fisLow;
DNSDBG( TRACE, ( "Dns_Ip6ReverseNameToAddress_A()\n" ));
//
// validate name
// fail if
// - too long
// - too short
// - not in in6.int domain
//
nameLength = strlen( pszName );
if ( nameLength > DNS_MAX_IP6_REVERSE_NAME_BUFFER_LENGTH )
{
return( FALSE );
}
if ( pszName[nameLength-1] == '.' )
{
nameLength--;
}
if ( nameLength <= SIZE_IP6REV )
{
return( FALSE );
}
nameLength -= SIZE_IP6REV;
if ( _strnicmp( ".ip6.int", &pszName[nameLength], SIZE_IP6REV ) != 0 )
{
return( FALSE );
}
//
// copy name
//
RtlCopyMemory(
nameBuffer,
pszName,
nameLength );
nameBuffer[nameLength] = 0;
//
// clear IP6 address
// - need for partial reverse lookup name
//
RtlZeroMemory(
byteArray,
sizeof(byteArray) );
//
// read digits
//
byteCount = 0;
fisLow = FALSE;
pch = nameBuffer + nameLength;
while ( 1 )
{
if ( byteCount > 15 )
{
return( FALSE );
}
--pch;
if ( *pch == '.' )
{
*pch = 0;
pch++;
}
else if ( pch == nameBuffer )
{
}
else
{
// DCR: multi-digit nibbles in reverse name -- error?
continue;
}
// convert nibble
// - zero test special as
// A) faster
// B) strtoul() uses for error case
if ( *pch == '0' )
{
nibble = 0;
}
else
{
nibble = strtoul( pch, NULL, 16 );
if ( nibble == 0 || nibble > 15 )
{
return( FALSE );
}
}
// save high nibble
// on low nibble, write byte to IP6 address
if ( !fisLow )
{
highNibble = nibble;
fisLow = TRUE;
}
else
{
//byteArray[byteCount++] = (BYTE) (lowNibble | (nibble << 4));
pIp6Addr->IP6Byte[byteCount++] = (BYTE) ( (highNibble<<4) | nibble );
fisLow = FALSE;
}
// terminate at string beginning
// or continue back up string
if ( pch == nameBuffer )
{
break;
}
pch--;
}
//*pIp6Addr = *(PIP6_ADDRESS) byteArray;
DNSDBG( TRACE, (
"Success on Dns_Ip6ReverseNameToAddress_A( %s )\n",
pszName ));
return( TRUE );
}
BOOL
Dns_Ip6ReverseNameToAddress_W(
OUT PIP6_ADDRESS pIp6Addr,
IN PCWSTR pwsName
)
/*++
Routine Description:
Get IP for reverse lookup name.
Arguments:
pIp6Addr -- addr to receive IP address if found
pszName -- name to lookup
Return Value:
TRUE -- if reverse lookup name converted to IP
FALSE -- if not IP6 reverse lookup name
--*/
{
CHAR nameBuffer[ DNS_MAX_IP6_REVERSE_NAME_BUFFER_LENGTH+1 ];
DWORD bufLength;
DWORD nameLengthUtf8;
DNSDBG( TRACE, (
"Dns_Ip6ReverseNameToAddress_W( %S )\n",
pwsName ));
//
// convert to UTF8
// - use UTF8 since conversion to it is trivial and it
// is identical to ANSI for all reverse lookup names
//
bufLength = DNS_MAX_IP6_REVERSE_NAME_BUFFER_LENGTH + 1;
nameLengthUtf8 = Dns_StringCopy(
nameBuffer,
& bufLength,
(PCHAR) pwsName,
0, // NULL terminated
DnsCharSetUnicode,
DnsCharSetUtf8 );
if ( nameLengthUtf8 == 0 )
{
return FALSE;
}
//
// call ANSI routine to do conversion
//
return Dns_Ip6ReverseNameToAddress_A(
pIp6Addr,
(PCSTR) nameBuffer );
}
//
// Combined IP4/IP6 reverse-name-to-address
//
BOOL
Dns_ReverseNameToAddress_W(
OUT PCHAR pAddrBuf,
IN OUT PDWORD pBufLength,
IN PCWSTR pString,
IN OUT PDWORD pAddrFamily
)
/*++
Routine Description:
Build address (IP4 or IP6) from reverse lookup name.
Arguments:
pAddrBuf -- buffer to receive address
pBufLength -- ptr to address length
input - length of buffer
output - length of address found
pString -- address string
pAddrFamily -- ptr to address family
input - zero for any family or particular family to check
output - family found; zero if no conversion
Return Value:
TRUE if successful.
FALSE on error. GetLastError() for status.
--*/
{
return Dns_StringToAddressEx(
pAddrBuf,
pBufLength,
(PCSTR) pString,
pAddrFamily,
TRUE, // unicode
TRUE // reverse
);
}
BOOL
Dns_ReverseNameToAddress_A(
OUT PCHAR pAddrBuf,
IN OUT PDWORD pBufLength,
IN PCSTR pString,
IN OUT PDWORD pAddrFamily
)
{
return Dns_StringToAddressEx(
pAddrBuf,
pBufLength,
pString,
pAddrFamily,
FALSE, // ANSI
TRUE // reverse
);
}
//
// Combined string-to-address private workhorse
//
BOOL
Dns_StringToAddressEx(
OUT PCHAR pAddrBuf,
IN OUT PDWORD pBufLength,
IN PCSTR pString,
IN OUT PDWORD pAddrFamily,
IN BOOL fUnicode,
IN BOOL fReverse
)
/*++
Routine Description:
Build address (IP4 or IP6 from string)
This routine is capable of all string-to-address
conversions and is the backbone of all the
combined string-to-address conversion routines.
Arguments:
pAddrBuf -- buffer to receive address
pBufLength -- ptr to address length
input - length of buffer
output - length of address found
pString -- address string
pAddrFamily -- ptr to address family
input - zero for any family or particular family to check
output - family found; zero if no conversion
fUnicode -- unicode string
fReverse -- reverse lookup string
Return Value:
TRUE if successful.
FALSE on error.
--*/
{
DNS_STATUS status = NO_ERROR;
DWORD length = 0;
INT family = *pAddrFamily;
DWORD bufLength = *pBufLength;
BOOL fconvert;
PCSTR preverseString;
CHAR nameBuffer[ DNS_MAX_REVERSE_NAME_BUFFER_LENGTH+1 ];
DNSDBG( TRACE, (
"Dns_StringToAddressEx( %S%s )\n",
fUnicode ? pString : "",
fUnicode ? "" : pString ));
//
// convert reverse to ANSI
//
// reverse lookups are done in ANSI; convert here to avoid
// double string conversion to check both IP4 and IP6
//
if ( fReverse )
{
preverseString = pString;
if ( fUnicode )
{
DWORD bufLength = DNS_MAX_REVERSE_NAME_BUFFER_LENGTH;
if ( ! Dns_StringCopy(
nameBuffer,
& bufLength,
(PCHAR) pString,
0, // NULL terminated
DnsCharSetUnicode,
DnsCharSetUtf8 ) )
{
return FALSE;
}
preverseString = nameBuffer;
}
}
//
// check IP4
//
if ( family == 0 ||
family == AF_INET )
{
IP4_ADDRESS ip;
if ( fReverse )
{
fconvert = Dns_Ip4ReverseNameToAddress_A(
& ip,
preverseString );
}
else
{
if ( fUnicode )
{
fconvert = Dns_Ip4StringToAddress_W(
& ip,
(PCWSTR)pString );
}
else
{
fconvert = Dns_Ip4StringToAddress_A(
& ip,
pString );
}
}
if ( fconvert )
{
length = sizeof(IP4_ADDRESS);
family = AF_INET;
if ( bufLength < length )
{
status = ERROR_MORE_DATA;
}
else
{
* (PIP4_ADDRESS) pAddrBuf = ip;
}
DNSDBG( INIT2, (
"Converted string to IP4 address %s\n",
IP_STRING(ip) ));
goto Done;
}
}
//
// check IP6
//
if ( family == 0 ||
family == AF_INET6 )
{
IP6_ADDRESS ip;
if ( fReverse )
{
fconvert = Dns_Ip6ReverseNameToAddress_A(
& ip,
preverseString );
}
else
{
if ( fUnicode )
{
fconvert = Dns_Ip6StringToAddress_W(
& ip,
(PCWSTR)pString );
}
else
{
fconvert = Dns_Ip6StringToAddress_A(
& ip,
pString );
}
}
if ( fconvert )
{
length = sizeof(IP6_ADDRESS);
if ( bufLength < length )
{
status = ERROR_MORE_DATA;
}
else
{
family = AF_INET6;
* (PIP6_ADDRESS) pAddrBuf = ip;
}
IF_DNSDBG( INIT2 )
{
DnsDbg_Ip6Address(
"Converted string to IP6 address: ",
(PIP6_ADDRESS) pAddrBuf,
"\n" );
}
goto Done;
}
}
length = 0;
family = 0;
status = DNS_ERROR_INVALID_IP_ADDRESS;
Done:
if ( status )
{
SetLastError( status );
}
*pAddrFamily = family;
*pBufLength = length;
DNSDBG( TRACE, (
"Leave Dns_StringToAddressEx()\n"
"\tstatus = %d\n"
"\tptr = %p\n"
"\tlength = %d\n"
"\tfamily = %d\n",
status,
pAddrBuf,
length,
family ));
return( status==ERROR_SUCCESS );
}
//
// End straddr.c
//