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1.1 root 1: .\" Copyright (c) 1983 The Regents of the University of California.
2: .\" All rights reserved.
3: .\"
4: .\" Redistribution and use in source and binary forms are permitted
5: .\" provided that the above copyright notice and this paragraph are
6: .\" duplicated in all such forms and that any documentation,
7: .\" advertising materials, and other materials related to such
8: .\" distribution and use acknowledge that the software was developed
9: .\" by the University of California, Berkeley. The name of the
10: .\" University may not be used to endorse or promote products derived
11: .\" from this software without specific prior written permission.
12: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
13: .\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
14: .\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
15: .\"
16: .\" @(#)telnetd.8 6.7 (Berkeley) 6/28/90
17: .\"
18: .TH TELNETD 8 "June 28, 1990"
19: .UC 5
20: .SH NAME
21: telnetd \- DARPA TELNET protocol server
22: .SH SYNOPSIS
23: .B /etc/telnetd
24: [\fB\-debug\fP [\fIport\fP]]
25: [\fB\-l]
26: [\fB\-D options\fP]
27: [\fB\-D report\fP]
28: [\fB\-D exercise\fP]
29: [\fB\-D netdata\fP]
30: [\fB\-D ptydata\fP]
31: .SH DESCRIPTION
32: .I Telnetd
33: is a server which supports the DARPA standard
34: .B TELNET
35: virtual terminal protocol.
36: .I Telnetd
37: is invoked by the internet server (see
38: .IR inetd (8)),
39: normally for requests to connect to the
40: .B TELNET
41: port as indicated by the
42: .I /etc/services
43: file (see
44: .IR services (5)).
45: If the \fB\-debug\fP may be used, to start up \fBtelnetd\fP
46: manually, instead of through
47: .IR inetd (8).
48: If started up this way, \fIport\fP may be specified to
49: run \fItelnetd\fP on an alternate TCP port number.
50: .PP
51: The \fB\-D\fP option may be used for debugging purposes.
52: This allows \fItelnet\fR to print out debugging information
53: to the connection, allowing the user to see what telnetd
54: is doing.
55: There are several modifiers:
56: \fBoptions\fR prints information about the negotiation
57: of \fBTELNET\fR options,
58: \fBreport\fR prints the \fBoptions\fR information, plus
59: some additional information about what processing is going on,
60: \fBnetdata\fP displays the data stream received by \fItelnetd\fP,
61: \fBptydata\fP displays data written to the pty, and
62: \fBexercise\fR has not been implemented yet.
63: .PP
64: .I Telnetd
65: operates by allocating a pseudo-terminal device (see
66: .IR pty (4))
67: for a client, then creating a login process which has
68: the slave side of the pseudo-terminal as
69: .BR stdin ,
70: .BR stdout ,
71: and
72: .BR stderr .
73: .I Telnetd
74: manipulates the master side of the pseudo-terminal,
75: implementing the
76: .B TELNET
77: protocol and passing characters
78: between the remote client and the login process.
79: .PP
80: When a
81: .B TELNET
82: session is started up,
83: .I telnetd
84: sends
85: .B TELNET
86: options to the client side indicating
87: a willingness to do
88: .I remote echo
89: of characters, to
90: .I suppress go
91: .IR ahead ,
92: to do
93: .I remote flow
94: .IR control ,
95: and to receive
96: .I terminal type
97: .IR information ,
98: .I terminal speed
99: .IR information ,
100: and
101: .I window size information
102: from the remote client.
103: If the remote client is willing, the remote terminal type is
104: propagated in the environment of the created login process.
105: The pseudo-terminal allocated to the client is configured
106: to operate in \*(lqcooked\*(rq mode, and with XTABS and CRMOD
107: enabled (see
108: .IR tty (4)).
109: .PP
110: .I Telnetd
111: is willing to
112: .IR do :
113: .IR echo ,
114: .IR binary ,
115: .I suppress go
116: .IR ahead ,
117: and
118: .I timing
119: .IR mark .
120: .I Telnetd
121: is willing to have the remote client
122: .IR do :
123: .IR linemode ,
124: .IR binary ,
125: .I terminal
126: .IR type ,
127: .I terminal
128: .IR speed ,
129: .I window
130: .IR size ,
131: .I toggle flow
132: .IR control ,
133: .IR environment ,
134: .I X display
135: .IR location ,
136: and
137: .I suppress go
138: .IR ahead .
139: .SH "SEE ALSO"
140: telnet(1)
141: .SH BUGS
142: Some
143: .B TELNET
144: commands are only partially implemented.
145: .PP
146: Because of bugs in the original 4.2 BSD
147: .IR telnet (1),
148: .I telnetd
149: performs some dubious protocol exchanges to try to discover if the remote
150: client is, in fact, a 4.2 BSD
151: .IR telnet (1).
152: .PP
153: .I Binary mode
154: has no common interpretation except between similar operating systems
155: (Unix in this case).
156: .PP
157: The terminal type name received from the remote client is converted to
158: lower case.
159: .PP
160: .I Telnetd
161: never sends
162: .B TELNET
163: .I go ahead
164: commands.
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