New subject: [Bug 351002] dhcpcd: host name extension includes trailing '\0'.

31 Dec 2007

      https://bugzilla.novell.com/show_bug.cgi?id=351002

           Summary: dhcpcd: host name extension includes trailing '\0'.
           Product: openSUSE 10.3
           Version: Final
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Network
        AssignedTo: bnc-team-screening@forge.provo.novell.com
        ReportedBy: eich@novell.com
         QAContact: qa@suse.de
          Found By: Development

Created an attachment (id=188951)
 --> (https://bugzilla.novell.com/attachment.cgi?id=188951)
Suggested fix.

The hostname option that's send by dhcpcd during discover contains the trailing
'\0' as end marker of the underlying C-string. This character is also included
in the len field.

Later versions of the AVM FritzBox Firmware attempt to sanitize the passed
hostname and replace every occurance of a non-ASCII character in the hostname
passed by a dhcp client by a '-' character. This causes huge problems with DNS
for the local network as a host 'foo' is now known as host 'foo-'.

Looking at RFC2132 (http://rfc.net/rfc2132.html) section 3.14 a trailing '\0'
in a host name doesn't seem to be expected. 
It points to RFC 1035 (http://rfc.net/rfc1035.html) for restrictions on the
characters used for host names. 
RFC1035 is pretty clear that only '.', '-', [0-9], [a-z,A-Z] are valid
characters. (oddly a trailing '-' is also not valid, thus AVM's solution
doesn't necessarily produce a same hostname either).

In any case the problem goes away by fixing dhcpcd (See patch attached).

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[Bug 351002] New: dhcpcd: host name extension includes trailing '\0'.

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