mirror of
https://github.com/FWGS/xash3d-fwgs
synced 2024-11-27 04:11:08 +01:00
449 lines
9.2 KiB
C
449 lines
9.2 KiB
C
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "ipv6text.h"
|
|
#include "xash3d_types.h"
|
|
|
|
#ifdef _WIN32
|
|
#ifndef snprintf
|
|
#define snprintf _snprintf
|
|
#endif
|
|
#endif
|
|
|
|
void IPv6IPToString( char *pszOutText, const unsigned char *ip )
|
|
{
|
|
// Find the longest run of consecutive zero quads.
|
|
// If there's a tie, we want the leftmost one.
|
|
int idxLongestRunStart = -1;
|
|
int nLongestRun = 1; // It must be at least 2 quads in a row, a single 0 must not be compressed
|
|
int nCurrentRun = 0, idxQuad;
|
|
char *p;
|
|
qboolean bNeedColon;
|
|
|
|
for ( idxQuad = 0 ; idxQuad < 8 ; ++idxQuad )
|
|
{
|
|
// Zero
|
|
if ( ip[idxQuad*2] || ip[idxQuad*2 + 1] )
|
|
{
|
|
// Terminate run
|
|
nCurrentRun = 0;
|
|
}
|
|
else
|
|
{
|
|
// Extend (or begin) run
|
|
++nCurrentRun;
|
|
|
|
// Longer than previously found run?
|
|
if ( nCurrentRun > nLongestRun )
|
|
{
|
|
nLongestRun = nCurrentRun;
|
|
idxLongestRunStart = idxQuad - nCurrentRun + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Print the quads
|
|
p = pszOutText;
|
|
idxQuad = 0;
|
|
bNeedColon = false;
|
|
while ( idxQuad < 8 )
|
|
{
|
|
// Run of compressed zeros?
|
|
if ( idxQuad == idxLongestRunStart )
|
|
{
|
|
*(p++) = ':';
|
|
*(p++) = ':';
|
|
bNeedColon = false;
|
|
idxQuad += nLongestRun;
|
|
}
|
|
else
|
|
{
|
|
// Lowercase hex digits, with leading zeros omitted
|
|
static const char hexdigits[] = "0123456789abcdef";
|
|
unsigned quad;
|
|
|
|
// Colon to separate from previous, unless
|
|
// we are first or immediately follow compressed zero "::"
|
|
if ( bNeedColon )
|
|
*(p++) = ':';
|
|
|
|
// Next quad should should print a separator
|
|
bNeedColon = true;
|
|
|
|
// Assemble 16-bit quad value from the two bytes
|
|
quad = ( (unsigned)ip[idxQuad*2] << 8U ) | ip[idxQuad*2 + 1];
|
|
|
|
// Manually do the hex number formatting.
|
|
if ( quad >= 0x0010 )
|
|
{
|
|
if ( quad >= 0x0100 )
|
|
{
|
|
if ( quad >= 0x1000 )
|
|
*(p++) = hexdigits[ quad >> 12U ];
|
|
*(p++) = hexdigits[ ( quad >> 8U ) & 0xf ];
|
|
}
|
|
*(p++) = hexdigits[ ( quad >> 4U ) & 0xf ];
|
|
}
|
|
|
|
// Least significant digit, which is always printed
|
|
*(p++) = hexdigits[ quad & 0xf ];
|
|
|
|
// On to the next one
|
|
++idxQuad;
|
|
}
|
|
}
|
|
|
|
// String terminator
|
|
*p = '\0';
|
|
}
|
|
|
|
void IPv6AddrToString( char *pszOutText, const unsigned char *ip, uint16_t port, uint32_t scope )
|
|
{
|
|
char *p = pszOutText;
|
|
|
|
// Open bracket
|
|
*(p++) = '[';
|
|
|
|
// Print in the IP
|
|
IPv6IPToString( p, ip );
|
|
|
|
// Find the end of the string
|
|
while (*p)
|
|
++p;
|
|
|
|
if ( scope )
|
|
{
|
|
// And now the scope. Max 32-digit scope number is 10 digits
|
|
snprintf( p, 12, "%%%d", scope );
|
|
|
|
// Find the end of the string
|
|
while (*p)
|
|
++p;
|
|
}
|
|
|
|
// And now the rest. Max 16-digit port number is 6 digits
|
|
snprintf( p, 8, "]:%u", (unsigned int)port );
|
|
}
|
|
|
|
static inline int ParseIPv6Addr_HexDigitVal( char c )
|
|
{
|
|
if ( c >= '0' && c <= '9' ) return c - '0';
|
|
if ( c >= 'a' && c <= 'f' ) return c - ('a' - 0xa);
|
|
if ( c >= 'A' && c <= 'F' ) return c - ('A' - 0xa);
|
|
return -1;
|
|
}
|
|
static inline int ParseIPv6Addr_DecimalDigitVal( char c )
|
|
{
|
|
if ( c >= '0' && c <= '9' ) return c - '0';
|
|
return -1;
|
|
}
|
|
static bool ParseIPv6Addr_IsSpace( char c )
|
|
{
|
|
// Newlines don't count, intentionally
|
|
return c == ' ' || c == '\t';
|
|
}
|
|
bool ParseIPv6Addr( const char *pszText, unsigned char *pOutIP, int *pOutPort, uint32_t *pOutScope )
|
|
{
|
|
unsigned char *d, *pZeroFill, *pEndIP;
|
|
const char *s;
|
|
qboolean bQuadMustFollow;
|
|
int nPort;
|
|
|
|
while ( ParseIPv6Addr_IsSpace( *pszText ) )
|
|
++pszText;
|
|
s = pszText;
|
|
|
|
// Skip opening bracket, if present
|
|
if ( *s == '[' )
|
|
{
|
|
++s;
|
|
while ( ParseIPv6Addr_IsSpace( *s ) )
|
|
++s;
|
|
}
|
|
|
|
// Special case for leading "::"
|
|
bQuadMustFollow = true;
|
|
d = pOutIP;
|
|
pZeroFill = NULL;
|
|
pEndIP = pOutIP + 16;
|
|
if ( s[0] == ':' && s[1] == ':' )
|
|
{
|
|
pZeroFill = d;
|
|
s += 2;
|
|
bQuadMustFollow = false;
|
|
}
|
|
|
|
// Parse quads until we get to the end
|
|
for (;;)
|
|
{
|
|
// Next thing must be a quad, or end of input. Is it a quad?
|
|
int quadDigit = ParseIPv6Addr_HexDigitVal( *s );
|
|
const char *pszStartQuad;
|
|
int quad;
|
|
|
|
if ( quadDigit < 0 )
|
|
{
|
|
if ( bQuadMustFollow )
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
// No room for more quads?
|
|
if ( d >= pEndIP )
|
|
return false;
|
|
|
|
pszStartQuad = s;
|
|
++s;
|
|
quad = quadDigit;
|
|
|
|
// Now parse up to three additional characters
|
|
quadDigit = ParseIPv6Addr_HexDigitVal( *s );
|
|
if ( quadDigit >= 0 )
|
|
{
|
|
quad = ( quad << 4 ) | quadDigit;
|
|
++s;
|
|
|
|
quadDigit = ParseIPv6Addr_HexDigitVal( *s );
|
|
if ( quadDigit >= 0 )
|
|
{
|
|
quad = ( quad << 4 ) | quadDigit;
|
|
++s;
|
|
|
|
quadDigit = ParseIPv6Addr_HexDigitVal( *s );
|
|
if ( quadDigit >= 0 )
|
|
{
|
|
quad = ( quad << 4 ) | quadDigit;
|
|
++s;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check if we hit a period, which would happen if we
|
|
// have an IPv4 dotted decimal. For example, "::ffff:192.168.1.210"
|
|
if ( *s == '.' )
|
|
{
|
|
// Make sure we would have room to store four more bytes.
|
|
unsigned char *pEndDottedDecimal = d+4;
|
|
if ( pEndDottedDecimal > pEndIP )
|
|
return false;
|
|
|
|
// Parse 4 octets
|
|
s = pszStartQuad;
|
|
for (;;)
|
|
{
|
|
|
|
// Parse 1-3 decimal digits
|
|
int octet = ParseIPv6Addr_DecimalDigitVal( *s );
|
|
int dig;
|
|
|
|
if ( octet < 0 )
|
|
return false;
|
|
++s;
|
|
dig = ParseIPv6Addr_DecimalDigitVal( *s );
|
|
if ( dig >= 0 )
|
|
{
|
|
++s;
|
|
octet = octet*10 + dig;
|
|
dig = ParseIPv6Addr_DecimalDigitVal( *s );
|
|
if ( dig >= 0 )
|
|
{
|
|
++s;
|
|
octet = octet*10 + dig;
|
|
|
|
// Make sure value is in range.
|
|
if ( octet > 255 )
|
|
return false;
|
|
}
|
|
}
|
|
*(d++) = (unsigned char)octet;
|
|
|
|
// All done?
|
|
if ( d >= pEndDottedDecimal )
|
|
break;
|
|
|
|
// Next thing must be dot dot separator
|
|
if ( *s != '.' )
|
|
return false;
|
|
|
|
// Eat dot
|
|
++s;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
// Stash it in the next slot, ignoring for now the issue
|
|
// of compressed zeros
|
|
*(d++) = (unsigned char)( quad >> 8 );
|
|
*(d++) = (unsigned char)quad;
|
|
|
|
// Only valid character for the IP portion is a colon.
|
|
// Anything else ends the IP portion
|
|
if ( *s != ':' )
|
|
break;
|
|
|
|
// Compressed zeros?
|
|
if ( s[1] == ':' )
|
|
{
|
|
|
|
// Eat '::'
|
|
s += 2;
|
|
|
|
// Can only have one range of compressed zeros
|
|
if ( pZeroFill )
|
|
return false;
|
|
|
|
// Remember where to insert the compressed zeros
|
|
pZeroFill = d;
|
|
|
|
// An IP can end with '::'
|
|
bQuadMustFollow = false;
|
|
}
|
|
else
|
|
{
|
|
// If they have filed the entire IP with no compressed zeros,
|
|
// then this is unambiguously a port number. That's not
|
|
// necessarily the best style, but it *is* unambiguous
|
|
// what it should mean, so let's allow it. If there
|
|
// are compressed zeros, then this is ambiguous, and we will
|
|
// always interpret it as a quad.
|
|
if ( !pZeroFill && d >= pEndIP )
|
|
break; // leave ':' as next character, for below
|
|
|
|
// Eat ':'
|
|
++s;
|
|
|
|
// A single colon must be followed by another quad
|
|
bQuadMustFollow = true;
|
|
}
|
|
}
|
|
|
|
// End of the IP. Do we have compressed zeros?
|
|
if ( pZeroFill )
|
|
{
|
|
// How many zeros do we need to fill?
|
|
intptr_t nZeros = pEndIP - d;
|
|
if ( nZeros <= 0 )
|
|
return false;
|
|
|
|
// Shift the quads after the bytes to the end
|
|
memmove( pZeroFill+nZeros, pZeroFill, d-pZeroFill );
|
|
|
|
// And now fill the zeros
|
|
memset( pZeroFill, 0, nZeros );
|
|
}
|
|
else
|
|
{
|
|
// No compressed zeros. Just make sure we filled the IP exactly
|
|
if ( d != pEndIP )
|
|
return false;
|
|
}
|
|
|
|
if ( *s == '%' )
|
|
{
|
|
// Parse scope number
|
|
uint32_t unScope = 0;
|
|
int nScopeDigit;
|
|
|
|
++s;
|
|
|
|
nScopeDigit = ParseIPv6Addr_DecimalDigitVal( *s );
|
|
if ( nScopeDigit < 0 )
|
|
return false;
|
|
unScope = (uint32_t)nScopeDigit;
|
|
for (;;)
|
|
{
|
|
++s;
|
|
if ( *s == '\0' || *s == ']' || ParseIPv6Addr_IsSpace( *s ) )
|
|
break;
|
|
nScopeDigit = ParseIPv6Addr_DecimalDigitVal( *s );
|
|
if ( nScopeDigit < 0 )
|
|
return false;
|
|
unScope = unScope * 10 + nScopeDigit;
|
|
}
|
|
|
|
if ( pOutScope )
|
|
*pOutScope = unScope;
|
|
}
|
|
else
|
|
{
|
|
if ( pOutScope )
|
|
*pOutScope = 0;
|
|
}
|
|
|
|
// If we started with a bracket, then the next character MUST be a bracket.
|
|
// (And this is the only circumstance in which a closing bracket would be legal)
|
|
if ( *pszText == '[' )
|
|
{
|
|
while ( ParseIPv6Addr_IsSpace( *s ) )
|
|
++s;
|
|
if ( *s != ']' )
|
|
return false;
|
|
++s;
|
|
}
|
|
|
|
// Now we are definitely at the end of the IP. Do we have a port?
|
|
// We support all of the syntaxes mentioned in RFC5952 section 6 other
|
|
// than the ambiguous case
|
|
if ( *s == ':' || *s == '#' || *s == '.' || *s == 'p' || *s == 'P' )
|
|
{
|
|
++s;
|
|
}
|
|
else
|
|
{
|
|
while ( ParseIPv6Addr_IsSpace( *s ) )
|
|
++s;
|
|
if ( *s == '\0' )
|
|
{
|
|
// Parsed IP without port OK
|
|
if ( pOutPort )
|
|
*pOutPort = -1;
|
|
return true;
|
|
}
|
|
|
|
if ( strncmp( s, "port", 4 ) == 0 )
|
|
{
|
|
s += 4;
|
|
while ( ParseIPv6Addr_IsSpace( *s ) )
|
|
++s;
|
|
}
|
|
else
|
|
{
|
|
// Extra stuff after the IP which isn't whitespace or a port
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// We have a port. If they didn't ask for it, that's considered a parse failure.
|
|
if ( !pOutPort )
|
|
return false;
|
|
|
|
// Parse port number
|
|
nPort = ParseIPv6Addr_DecimalDigitVal( *s );
|
|
if ( nPort < 0 )
|
|
return false;
|
|
for (;;)
|
|
{
|
|
int portDigit;
|
|
|
|
++s;
|
|
if ( *s == '\0' || ParseIPv6Addr_IsSpace( *s ) )
|
|
break;
|
|
portDigit = ParseIPv6Addr_DecimalDigitVal( *s );
|
|
if ( portDigit < 0 )
|
|
return false;
|
|
nPort = nPort * 10 + portDigit;
|
|
if ( nPort > 0xffff )
|
|
return false;
|
|
}
|
|
|
|
// Consume trailing whitespace; confirm nothing else in the input
|
|
while ( ParseIPv6Addr_IsSpace( *s ) )
|
|
++s;
|
|
if ( *s != '\0' )
|
|
return false;
|
|
|
|
*pOutPort = nPort;
|
|
return true;
|
|
}
|
|
|