projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| ea3f50ea KM |
1 | .\" Copyright (c) 1983 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| b78cbcc5 | 5 | .\" @(#)telnetd.8 6.1 (Berkeley) %G% |
| ea3f50ea | 6 | .\" |
| b78cbcc5 | 7 | .TH TELNETD 8C "" |
| ea3f50ea KM |
8 | .UC 5 |
| 9 | .SH NAME | |
| 10 | telnetd \- DARPA TELNET protocol server | |
| 11 | .SH SYNOPSIS | |
| 12 | .B /etc/telnetd | |
| 13 | [ | |
| 14 | .B \-d | |
| 15 | ] [ | |
| 16 | .I port | |
| 17 | ] | |
| 18 | .SH DESCRIPTION | |
| 19 | .I Telnetd | |
| 20 | is a server which supports the DARPA standard TELNET | |
| 21 | virtual terminal protocol. The TELNET server operates | |
| 22 | at the port indicated in the ``telnet'' service description; | |
| 23 | see | |
| 24 | .IR services (5). | |
| 25 | This port number may be overridden (for debugging purposes) | |
| 26 | by specifying a port number on the command line. If the | |
| 27 | .B \-d | |
| 28 | option is specified, each socket created by | |
| 29 | .I telnetd | |
| 30 | will have debugging enabled (see SO_DEBUG in | |
| 31 | .IR socket (2)). | |
| 32 | .PP | |
| 33 | .I Telnetd | |
| 34 | operates by allocating a pseudo-terminal device (see | |
| 35 | .IR pty (4)) | |
| 36 | for a client, then creating a login process which has | |
| 37 | the slave side of the pseudo-terminal as | |
| 38 | .BR stdin , | |
| 39 | .BR stdout , | |
| 40 | and | |
| 41 | .BR stderr . | |
| 42 | .I Telnetd | |
| 43 | manipulates the master side of the pseudo terminal, | |
| 44 | implementing the TELNET protocol and passing characters | |
| 45 | between the client and login process. | |
| 46 | .PP | |
| 47 | When a TELNET session is started up, | |
| 48 | .I telnetd | |
| 49 | sends a TELNET option to the client side indicating | |
| 50 | a willingness to do ``remote echo'' of characters. | |
| 51 | The pseudo terminal allocated to the client is configured | |
| 52 | to operate in ``cooked'' mode, and with XTABS and CRMOD | |
| 53 | enabled (see | |
| 54 | .IR tty (4)). | |
| 55 | Aside from this initial setup, the only mode changes | |
| 56 | .I telnetd | |
| 57 | will carry out are those required for echoing characters | |
| 58 | at the client side of the connection. | |
| 59 | .PP | |
| 60 | .I Telnetd | |
| 61 | supports binary mode, and most of the common TELNET options, | |
| 62 | but does not, for instance, support timing marks. Consult | |
| 63 | the source code for an exact list of which options are not | |
| 64 | implemented. | |
| 65 | .SH "SEE ALSO" | |
| 66 | telnet(1C) | |
| 67 | .SH BUGS | |
| 68 | A complete list of the options supported should be given here. |