RFC 1413 (rfc1413) - Page 2 of 8
Identification Protocol
Alternative Format: Original Text Document
RFC 1413 Identification Protocol February 1993
3. RESTRICTIONS
Queries are permitted only for fully specified connections. The
query contains the local/foreign port pair -- the local/foreign
address pair used to fully specify the connection is taken from the
local and foreign address of query connection. This means a user on
address A may only query the server on address B about connections
between A and B.
4. QUERY/RESPONSE FORMAT
The server accepts simple text query requests of the form:
,
where is the TCP port (decimal) on the target (where
the "ident" server is running) system, and is the
TCP port (decimal) on the source (client) system.
N.B - If a client on host A wants to ask a server on host B about a
connection specified locally (on the client's machine) as 23, 6191
(an inbound TELNET connection), the client must actually ask about
6191, 23 - which is how the connection would be specified on host B.
For example:
6191, 23
The response is of the form
, : :
where , are the same pair as the
query, is a keyword identifying the type of response, and
is context dependent.
The information returned is that associated with the fully specified
TCP connection identified by , ,
, , where and
are the local and foreign IP addresses of the
querying connection -- i.e., the TCP connection to the Identification
Protocol Server. ( and are taken
from the query.)
For example:
6193, 23 : USERID : UNIX : stjohns
6195, 23 : ERROR : NO-USER
St. Johns