On Thu, 06 Dec 2001 03:49:08 +0700, Fyodor said:
> I guess 63(?) characters is the hostname max length according to RFC. So
> it is probably statd messup/overlook not to chop it. (although I doubt
> it would make much harm in this case)..
RFC1123, section 2.1:
2.1 Host Names and Numbers
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.
Host software MUST handle host names of up to 63 characters and
SHOULD handle host names of up to 255 characters.
Whenever a user inputs the identity of an Internet host, it SHOULD
be possible to enter either (1) a host domain name or (2) an IP
address in dotted-decimal ("#.#.#.#") form. The host SHOULD check
the string syntactically for a dotted-decimal number before
looking it up in the Domain Name System.
RFC1035, section 2.3.4:
2.3.4. Size limits
Various objects and parameters in the DNS have size limits. They are
listed below. Some could be easily changed, others are more
fundamental.
labels 63 octets or less
names 255 octets or less
TTL positive values of a signed 32 bit number.
UDP messages 512 octets or less
So it's a hostname of 255 chars or less, with no more than 63 characters
per each level of domain name.
I mention this because I've seen too many 'char hostname[64];' in my life ;)
--
Valdis Kletnieks
Operating Systems Analyst
Virginia Tech
This archive was generated by hypermail 2b30 : Thu Dec 06 2001 - 09:50:11 PST