On Tue, 2002-05-21 at 23:00, Smitty wrote:
> Anyone know which keyboard characters one cannot use in a domain name?
> Smitty
RFC952 defines a hostname as:
<name> ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]
A "let" is a letter A-Z, digit is 0-9.
RFC1123 relaxes it a bit: "The syntax of a legal Internet host name was
specified in RFC-952 [DNS:4]. One aspect of host name syntax is hereby
changed: the restriction on the first character is relaxed to allow
either a letter or a digit. Host software MUST support this more
liberal syntax."
So a FQDN must begin with only a letter or digit, use only letters,
digits and hyphens in the name and conclude with only a letter or digit.
Of course, you could create something that was otherwise, but it would
likely break a lot of software trying to interact with it.
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
#!/usr/bin/perl -w
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map
{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;
$t^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)
[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h=5;$_=unxb24,join
"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$d=
unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d
>>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*
8^$q<<6))<<9,$_=$t[$_]^(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}
print+x"C*",@a}';s/x/pack+/g;eval
usage: qrpff 153 2 8 105 225 < /mnt/dvd/VOB_FILENAME \
| extract_mpeg2 | mpeg2dec -
http://www.cs.cmu.edu/~dst/DeCSS/Gallery/
http://www.eff.org/ http://www.anti-dmca.org/
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