https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3812
Summary: Support for DHCID RR (RFC 4701)
Product: Wireshark
Version: 1.2.1
Platform: All
OS/Version: All
Status: NEW
Severity: Minor
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: ivan_jr@xxxxxxxxx
Created an attachment (id=3462)
--> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=3462)
Support for DHCID RR packet-dns.c
Build Information:
Version 1.3.0-mydev
Copyright 1998-2009 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled with GTK+ 2.16.2, with GLib 2.20.3, with WinPcap (version unknown),
with libz 1.2.3, without POSIX capabilities, with libpcre 7.0, with SMI 0.4.8,
with c-ares 1.6.0, with Lua 5.1, without Python, with GnuTLS 2.8.1, with Gcrypt
1.4.4, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built Aug 5
2009), with AirPcap.
Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1
beta5
(packet.dll version 4.1.0.1452), based on libpcap version 1.0.0, GnuTLS 2.8.1,
Gcrypt 1.4.4, without AirPcap.
Built using Microsoft Visual C++ 9.0 build 30729
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
Support for DHCID RR (RFC 4701)
Notes:
- see attached patch. created from tortoisesvn create patch
- only shows rdata section (see section 3.2), only the dhcp clients and servers
will use this.
- see attached packet capture
- tests ok
====================
A DNS Resource Record (RR) for Encoding
Dynamic Host Configuration Protocol (DHCP) Information (DHCID RR)
3. The DHCID RR
The DHCID RR is defined with mnemonic DHCID and type code 49. The
DHCID RR is only defined in the IN class. DHCID RRs cause no
additional section processing.
3.1. DHCID RDATA Format
The RDATA section of a DHCID RR in transmission contains RDLENGTH
octets of binary data. The format of this data and its
interpretation by DHCP servers and clients are described below.
DNS software should consider the RDATA section to be opaque. DHCP
clients or servers use the DHCID RR to associate a DHCP client's
identity with a DNS name, so that multiple DHCP clients and servers
may deterministically perform dynamic DNS updates to the same zone.
From the updater's perspective, the DHCID resource record RDATA
consists of a 2-octet identifier type, in network byte order,
followed by a 1-octet digest type, followed by one or more octets
representing the actual identifier:
< 2 octets > Identifier type code
< 1 octet > Digest type code
< n octets > Digest (length depends on digest type)
3.2. DHCID Presentation Format
In DNS master files, the RDATA is represented as a single block in
base-64 encoding identical to that used for representing binary data
in [8], Section 3. The data may be divided up into any number of
white-space-separated substrings, down to single base-64 digits,
which are concatenated to form the complete RDATA. These substrings
can span lines using the standard parentheses.
...
[8] Josefsson, S., "The Base16, Base32, and Base64 Data Encodings",
RFC 3548, July 2003.
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