RFC811 - Hostnames Server

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Ken Harrenstien RFC-811

Vic White 1 March 1982

Elizabeth Feinler

Network Information Center

SRI International

HOSTNAMES SERVER

INTRODUCTION

The NIC Internet Hostnames Server is an NCP/TCP-based host

information program and protocol running on the SRI-NIC

machine. It is one of a series of ARPANET/Internet name

services maintained by the Network Information Center (NIC) at

SRI International on behalf of the Defense Communications

Agency (DCA). The function of this particular server is to

deliver machine-readable name/address information describing

networks, gateways, hosts, and eventually domains, within the

internet environment. As currently implemented, the server

provides the information outlined in the DoD Internet Host

Table Specification (RFC810).

QUERY/RESPONSE FORMAT

The name server accepts simple text query requests of the form

<command key> <argument(s)> [<options>]

where square brackets ("[]") indicate an optional field. The

command key is a keyWord indicating the nature of the request.

The defined keys are eXPlained below.

The response, on the other hand, is of the form

<response key> : <rest of response>

where <response key> is a keyword indicating the nature of the

response, and the rest of the response is interpreted in the

context of the key.

COMMAND/RESPONSE KEYS

The currently defined keywords are:

Command Keys:

HNAME (find entry with given name)

HADDR (find entry with given address)

ALL (return entire host table)

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RFC811 Hostnames Server

Response Keys:

ERR (entry not found, nature of error follows)

NET (entry found, rest of entry follows)

GATEWAY (entry found, rest of entry follows)

HOST (entry found, rest of entry follows)

BEGIN (followed by multiple entries)

END (done with BEGIN block of entries)

More keywords will be added as new needs are recognized. A

more detailed description of the allowed requests/responses

will follow.

PROTOCOL

To Access this server from a program, connect to service host

(SRI-NIC)

TCP: port 101 decimal

NCP: socket 101 decimal for ICP

send the information query, and await the response.

Note: Care should be taken to interpret the nature of the

reply (e.g, single record or multiple record), so that no

confusion about the state of the reply results. An "ALL"

request will likely return several hundred or more records of

all types (see RFC810), whereas "HNAME" or "HADDR" will

usually return one HOST record, or "BEGIN:", list of host

records, "END:", if there is more than one match.

QUERY/RESPONSE EXAMPLES

1. HNAME Query - Given a name, find the entry or entries that

match

the name. For example:

HNAME SRI-NIC <CRLF> ;where <CRLF> is a carriage

return/

linefeed, and 'SRI-NIC' is a

host name

The likely response is:

HOST : 10.0.0.73 : SRI-NIC,NIC : FOONLY-F3 : TENEX : NCP :

A response may stretch across more than one line.

Continuation lines always begin with at least one space.

For example:

HOST : 10.0.0.73 : SRI-NIC,NIC : FOONLY-F3 : TENEX : NCP :

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Hostnames Server RFC811

2. HADDR Query - Given an internet address (as specified in

RFC

796) find the entry or entries that match that address.

For example:

HADDR 10.0.0.73 <CRLF> ;where <CRLF> is a carriage

return/

linefeed, and '10.0.0.73' is a

host

address

The likely response is the same as for the HNAME request:

HOST : 10.0.0.73 : SRI-NIC,NIC : FOONLY-F3 : TENEX : NCP :

3. ALL Query - Deliver the entire internet host table in a

machine-readable form. For example:

ALL <CRLF> ;where <CRLF> is a carriage return/linefeed

The likely response is the keyword 'BEGIN' followed by a

colon ':', followed by the entire internet host table in

the format specified in RFC810, followed by 'END:'. For

example:

BEGIN:

NET : 10.0.0.0 : ARPANET :

NET : 18.0.0.0 : LCSNET :

GATEWAY : 10.0.0.77, 18.8.0.4 : MIT-GW :: MOS : IP/GW :

HOST : 10.0.0.73 : SRI-NIC,NIC : TENEX : FOONLY-F3

NCP/TELNET, NCP/FTP, TCP :

HOST : 10.2.0.11 : SU-TIP, FELT-TIP ::

END:

ERROR HANDLING

1. ERR Reply - may occur on any query, and should be permitted

in

any access program using the name server. Errors are of

the form

ERR : <code> : <string> :

as in

ERR : NAMNFD : Name not found :

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RFC811 Hostnames Server

The error code is a unique descriptor, limited to 8 characters

in length for any given error. It may be used by the access

program to identify the error and, in some cases, to handle it

automatically. The string is an accompanying message for a

given error for that case where the access program simply logs

the error message. Current codes and their associated

interpretations are

NAMNFD -- Name not found; name not in table

ADRNFD -- Address not found; address not in

table

ILLCOM -- Illegal command; command key not

recognized

TMPSYS -- Temporary system failure, try again

later

REMARKS

The host name server described above runs over a single global

internet host name/address data base. This data base is an

extension of the old ARPANET Hosts.txt file, and is being

maintained by the NIC to provide continuity during the

transition and expansion to the internet environment. We view

the central administration of a global host name data base,

along with this simple name server, as an interim solution on

the way to a decentralized, distributed name/address

translation service. The NIC welcomes your comments and

suggestions for such an expanded service. Send comments to

NIC@SRI-NIC.

REFERENCES

1. Feinler, E., Harrenstien, K., Su, Z. and White, V.

Official

DoD Internet Host Table Specification, RFC810, Network

Information Center, SRI International, March 1, 1982.

2. Postel, J. Address Mappings, RFC796, Information Sciences

Inst., Univ. of Southern Calif., Marina Del Rey, Sept.

1981.

3. Pickens, J., Feinler, E., and Mathis, J. The NIC Name

Server,

A Datagram-based Information Utility, Network Information

Center, SRI International, July 1979.

 
 
 
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