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namespace Org.BouncyCastle.Utilities.Net
{
// TODO[api] Make static
public class IPAddress
{
/**
* Validate the given IPv4 or IPv6 address.
*
* @param address the IP address as a string.
*
* @return true if a valid address, false otherwise
*/
public static bool IsValid(string address)
{
return IsValidIPv4(address) || IsValidIPv6(address);
}
/**
* Validate the given IPv4 or IPv6 address and netmask.
*
* @param address the IP address as a string.
*
* @return true if a valid address with netmask, false otherwise
*/
public static bool IsValidWithNetMask(string address)
{
return IsValidIPv4WithNetmask(address) || IsValidIPv6WithNetmask(address);
}
/**
* Validate the given IPv4 address.
*
* @param address the IP address as a string.
*
* @return true if a valid IPv4 address, false otherwise
*/
public static bool IsValidIPv4(string address)
{
int length = address.Length;
if (length < 7 || length > 15)
return false;
int pos = 0;
for (int octetIndex = 0; octetIndex < 3; ++octetIndex)
{
int end = Platform.IndexOf(address, '.', pos);
if (!IsParseableIPv4Octet(address, pos, end))
return false;
pos = end + 1;
}
return IsParseableIPv4Octet(address, pos, length);
}
public static bool IsValidIPv4WithNetmask(string address)
{
int index = Platform.IndexOf(address, '/');
if (index < 1)
return false;
string before = address.Substring(0, index);
string after = address.Substring(index + 1);
return IsValidIPv4(before) && (IsValidIPv4(after) || IsParseableIPv4Mask(after));
}
/**
* Validate the given IPv6 address.
*
* @param address the IP address as a string.
*
* @return true if a valid IPv4 address, false otherwise
*/
public static bool IsValidIPv6(string address)
{
if (address.Length == 0)
return false;
if (address[0] != ':' && GetDigitHexadecimal(address, 0) < 0)
return false;
int segmentCount = 0;
string temp = address + ":";
bool doubleColonFound = false;
int pos = 0, end;
while (pos < temp.Length && (end = Platform.IndexOf(temp, ':', pos)) >= pos)
{
if (segmentCount == 8)
return false;
if (pos != end)
{
string value = temp.Substring(pos, end - pos);
if (end == temp.Length - 1 && Platform.IndexOf(value, '.') > 0)
{
// add an extra one as address covers 2 words.
if (++segmentCount == 8)
return false;
if (!IsValidIPv4(value))
return false;
}
else if (!IsParseableIPv6Segment(temp, pos, end))
{
return false;
}
}
else
{
if (end != 1 && end != temp.Length - 1 && doubleColonFound)
return false;
doubleColonFound = true;
}
pos = end + 1;
++segmentCount;
}
return segmentCount == 8 || doubleColonFound;
}
public static bool IsValidIPv6WithNetmask(string address)
{
int index = Platform.IndexOf(address, '/');
if (index < 1)
return false;
string before = address.Substring(0, index);
string after = address.Substring(index + 1);
return IsValidIPv6(before) && (IsValidIPv6(after) || IsParseableIPv6Mask(after));
}
private static bool IsParseableIPv4Mask(string s)
{
return IsParseableDecimal(s, 0, s.Length, 2, false, 0, 32);
}
private static bool IsParseableIPv4Octet(string s, int pos, int end)
{
return IsParseableDecimal(s, pos, end, 3, true, 0, 255);
}
private static bool IsParseableIPv6Mask(string s)
{
return IsParseableDecimal(s, 0, s.Length, 3, false, 1, 128);
}
private static bool IsParseableIPv6Segment(string s, int pos, int end)
{
return IsParseableHexadecimal(s, pos, end, 4, true, 0x0000, 0xFFFF);
}
private static bool IsParseableDecimal(string s, int pos, int end, int maxLength, bool allowLeadingZero,
int minValue, int maxValue)
{
int length = end - pos;
if (length < 1 | length > maxLength)
return false;
bool checkLeadingZero = length > 1 & !allowLeadingZero;
if (checkLeadingZero && s[pos] == '0')
return false;
int value = 0;
while (pos < end)
{
int d = GetDigitDecimal(s, pos++);
if (d < 0)
return false;
value *= 10;
value += d;
}
return value >= minValue & value <= maxValue;
}
private static bool IsParseableHexadecimal(string s, int pos, int end, int maxLength, bool allowLeadingZero,
int minValue, int maxValue)
{
int length = end - pos;
if (length < 1 | length > maxLength)
return false;
bool checkLeadingZero = length > 1 & !allowLeadingZero;
if (checkLeadingZero && s[pos] == '0')
return false;
int value = 0;
while (pos < end)
{
int d = GetDigitHexadecimal(s, pos++);
if (d < 0)
return false;
value *= 16;
value += d;
}
return value >= minValue & value <= maxValue;
}
private static int GetDigitDecimal(string s, int pos)
{
char c = s[pos];
uint d = (uint)(c - '0');
return d <= 9 ? (int)d : -1;
}
private static int GetDigitHexadecimal(string s, int pos)
{
char c = s[pos];
uint d = (uint)c | 0x20U;
d -= (d >= (uint)'a') ? ((uint)'a' - 10) : (uint)'0';
return d <= 16 ? (int)d : -1;
}
}
}
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