In heart bleed exploit, I basically get a lot of weird characters(non-printable) from server.
Can somebody tell me, when I read a continuous memory segment, how to interpret those non-printable characters?
In heart bleed exploit, I basically get a lot of weird characters(non-printable) from server.
Can somebody tell me, when I read a continuous memory segment, how to interpret those non-printable characters?
I know its old question, but this should help to figure out what those characters are and make them visible/printable
private static string GetPrintableCharacter(char character)
{
switch (character)
{
case '\a':
{
return "\\a";
}
case '\b':
{
return "\\b";
}
case '\t':
{
return "\\t";
}
case '\n':
{
return "\\n";
}
case '\v':
{
return "\\v";
}
case '\f':
{
return "\\f";
}
case '\r':
{
return "\\r";
}
default:
{
if (character == ' ')
{
break;
}
else
{
throw new InvalidArgumentException(Resources.NOTSUPPORTCHAR, new object[] { character });
}
}
}
return "\\x20";
}
public static string GetPrintableText(string text)
{
StringBuilder stringBuilder = new StringBuilder(1024);
if (text == null)
{
return "[~NULL~]";
}
if (text.Length == 0)
{
return "[~EMPTY~]";
}
stringBuilder.Remove(0, stringBuilder.Length);
int num = 0;
for (int i = 0; i < text.Length; i++)
{
if (text[i] == '\a' || text[i] == '\b' || text[i] == '\f' || text[i] == '\v' || text[i] == '\t' || text[i] == '\n' || text[i] == '\r' || text[i] == ' ')
{
num += 3;
}
}
int length = text.Length + num;
if (stringBuilder.Capacity < length)
{
stringBuilder = new StringBuilder(length);
}
string str = text;
for (int j = 0; j < str.Length; j++)
{
char chr = str[j];
if (chr > ' ')
{
stringBuilder.Append(chr);
}
else
{
stringBuilder.Append(StringHelper.GetPrintableCharacter(chr));
}
}
return stringBuilder.ToString();
}