Annotation of src/usr.bin/telnet/telnet.1, Revision 1.33
1.33 ! jmc 1: .\" $OpenBSD: telnet.1,v 1.32 2003/06/03 02:56:18 millert Exp $
1.2 niklas 2: .\" $NetBSD: telnet.1,v 1.5 1996/02/28 21:04:12 thorpej Exp $
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1.1 deraadt 4: .\" Copyright (c) 1983, 1990, 1993
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1.1 deraadt 16: .\" may be used to endorse or promote products derived from this software
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31: .\" from: @(#)telnet.1 8.4 (Berkeley) 2/3/94
32: .\"
33: .Dd February 3, 1994
34: .Dt TELNET 1
1.16 aaron 35: .Os
1.1 deraadt 36: .Sh NAME
37: .Nm telnet
1.16 aaron 38: .Nd user interface to the
1.1 deraadt 39: .Tn TELNET
40: protocol
41: .Sh SYNOPSIS
42: .Nm telnet
1.31 deraadt 43: .Bk -words
1.26 aaron 44: .Op Fl 8EFKLacdfrx
1.1 deraadt 45: .Op Fl X Ar authtype
1.3 niklas 46: .Op Fl b Ar hostalias
1.1 deraadt 47: .Op Fl e Ar escapechar
48: .Op Fl k Ar realm
49: .Op Fl l Ar user
50: .Op Fl n Ar tracefile
51: .Oo
52: .Ar host
1.9 deraadt 53: .Op Ar port
1.1 deraadt 54: .Oc
1.31 deraadt 55: .Ek
1.1 deraadt 56: .Sh DESCRIPTION
57: The
1.22 aaron 58: .Nm
1.1 deraadt 59: command
1.16 aaron 60: is used to communicate with another host using the
1.1 deraadt 61: .Tn TELNET
62: protocol.
63: If
1.22 aaron 64: .Nm
1.1 deraadt 65: is invoked without the
66: .Ar host
67: argument, it enters command mode,
68: indicated by its prompt
69: .Pq Nm telnet\&> .
70: In this mode, it accepts and executes the commands listed below.
71: If it is invoked with arguments, it performs an
72: .Ic open
73: command with those arguments.
74: .Pp
1.19 aaron 75: The options are as follows:
1.27 aaron 76: .Bl -tag -width Ds
1.1 deraadt 77: .It Fl 8
1.22 aaron 78: Specifies an 8-bit data path.
79: This causes an attempt to negotiate the
1.1 deraadt 80: .Dv TELNET BINARY
81: option on both input and output.
82: .It Fl E
83: Stops any character from being recognized as an escape character.
84: .It Fl F
1.28 hin 85: If Kerberos 5 authentication is being used, the
1.1 deraadt 86: .Fl F
87: option allows the local credentials to be forwarded
88: to the remote system, including any credentials that
89: have already been forwarded into the local environment.
90: .It Fl K
91: Specifies no automatic login to the remote system.
92: .It Fl L
1.22 aaron 93: Specifies an 8-bit data path on output.
94: This causes the BINARY option to be negotiated on output.
1.16 aaron 95: .It Fl X Ar atype
1.1 deraadt 96: Disables the
97: .Ar atype
98: type of authentication.
99: .It Fl a
100: Attempt automatic login.
101: Currently, this sends the user name via the
102: .Ev USER
103: variable
104: of the
105: .Ev ENVIRON
106: option if supported by the remote system.
107: The name used is that of the current user as returned by
108: .Xr getlogin 2
109: if it agrees with the current user ID,
110: otherwise it is the name associated with the user ID.
1.3 niklas 111: .It Fl b Ar hostalias
112: Uses
113: .Xr bind 2
1.12 aaron 114: on the local socket to bind it to an aliased address (see
1.3 niklas 115: .Xr ifconfig 8
1.12 aaron 116: and the ``alias'' specifier) or to the address of
1.3 niklas 117: another interface than the one naturally chosen by
118: .Xr connect 2 .
1.12 aaron 119: This can be useful when connecting to services which use IP addresses
1.3 niklas 120: for authentication and reconfiguration of the server is undesirable (or
121: impossible).
1.1 deraadt 122: .It Fl c
123: Disables the reading of the user's
124: .Pa \&.telnetrc
1.22 aaron 125: file.
126: (See the
1.1 deraadt 127: .Ic toggle skiprc
128: command on this man page.)
129: .It Fl d
130: Sets the initial value of the
131: .Ic debug
132: toggle to
1.12 aaron 133: .Dv TRUE .
1.16 aaron 134: .It Fl e Ar escapechar
1.1 deraadt 135: Sets the initial
136: .Nm
137: escape character to
1.33 ! jmc 138: .Ar escapechar .
1.1 deraadt 139: If
1.8 deraadt 140: .Ar escapechar
1.1 deraadt 141: is omitted, then
142: there will be no escape character.
143: .It Fl f
1.28 hin 144: If Kerberos 5 authentication is being used, the
1.1 deraadt 145: .Fl f
146: option allows the local credentials to be forwarded to the remote system.
147: .It Fl k Ar realm
148: If Kerberos authentication is being used, the
149: .Fl k
1.12 aaron 150: option requests that
1.22 aaron 151: .Nm
1.12 aaron 152: obtain tickets for the remote host in
1.8 deraadt 153: realm
154: .Ar realm
155: instead of the remote host's realm, as determined
1.1 deraadt 156: by
157: .Xr krb_realmofhost 3 .
1.16 aaron 158: .It Fl l Ar user
1.1 deraadt 159: When connecting to the remote system, if the remote system
160: understands the
161: .Ev ENVIRON
162: option, then
163: .Ar user
164: will be sent to the remote system as the value for the variable USER.
165: This option implies the
166: .Fl a
167: option.
168: This option may also be used with the
169: .Ic open
170: command.
1.16 aaron 171: .It Fl n Ar tracefile
1.1 deraadt 172: Opens
173: .Ar tracefile
174: for recording trace information.
175: See the
176: .Ic set tracefile
177: command below.
178: .It Fl r
179: Specifies a user interface similar to
1.30 millert 180: .Nm rlogin .
1.1 deraadt 181: In this
182: mode, the escape character is set to the tilde (~) character,
1.8 deraadt 183: unless modified by the
184: .Fl e
185: option.
1.1 deraadt 186: .It Fl x
1.33 ! jmc 187: Turn on encryption of the data stream.
! 188: When this option is turned on,
1.29 hin 189: .Nm
190: will exit with an error if authentication cannot be negotiated or if
191: encryption cannot be turned on.
1.1 deraadt 192: .It Ar host
193: Indicates the official name, an alias, or the Internet address
194: of a remote host.
195: .It Ar port
1.22 aaron 196: Indicates a port number (address of an application).
197: If a number is not specified, the default
198: .Nm
1.1 deraadt 199: port is used.
200: .El
201: .Pp
1.22 aaron 202: When in rlogin mode, a line of the form ~.
203: disconnects from the
1.1 deraadt 204: remote host; ~ is the telnet escape character.
205: Similarly, the line ~^Z suspends the telnet session.
206: The line ~^] escapes to the normal telnet escape prompt.
207: .Pp
208: Once a connection has been opened,
1.22 aaron 209: .Nm
1.1 deraadt 210: will attempt to enable the
211: .Dv TELNET LINEMODE
212: option.
1.12 aaron 213: If this fails,
1.22 aaron 214: .Nm
1.1 deraadt 215: will revert to one of two input modes:
1.12 aaron 216: either ``character at a time''
217: or ``old line by line''
1.1 deraadt 218: depending on what the remote system supports.
219: .Pp
1.16 aaron 220: When
1.1 deraadt 221: .Dv LINEMODE
222: is enabled, character processing is done on the
1.22 aaron 223: local system, under the control of the remote system.
224: When input
1.1 deraadt 225: editing or character echoing is to be disabled, the remote system
1.22 aaron 226: will relay that information.
227: The remote system will also relay
1.1 deraadt 228: changes to any special characters that happen on the remote
229: system, so that they can take effect on the local system.
230: .Pp
1.12 aaron 231: In ``character at a time'' mode, most
1.1 deraadt 232: text typed is immediately sent to the remote host for processing.
233: .Pp
1.12 aaron 234: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 235: and (normally) only completed lines are sent to the remote host.
1.12 aaron 236: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 237: to turn off and on the local echo
238: (this would mostly be used to enter passwords
239: without the password being echoed).
240: .Pp
1.16 aaron 241: If the
1.1 deraadt 242: .Dv LINEMODE
243: option is enabled, or if the
244: .Ic localchars
245: toggle is
246: .Dv TRUE
1.12 aaron 247: (the default for ``old line by line''; see below),
1.1 deraadt 248: the user's
1.12 aaron 249: .Ic quit ,
1.1 deraadt 250: .Ic intr ,
251: and
252: .Ic flush
253: characters are trapped locally, and sent as
254: .Tn TELNET
255: protocol sequences to the remote side.
1.16 aaron 256: If
1.1 deraadt 257: .Dv LINEMODE
258: has ever been enabled, then the user's
259: .Ic susp
260: and
261: .Ic eof
262: are also sent as
263: .Tn TELNET
264: protocol sequences,
265: and
266: .Ic quit
1.16 aaron 267: is sent as a
1.1 deraadt 268: .Dv TELNET ABORT
1.16 aaron 269: instead of
1.8 deraadt 270: .Dv BREAK .
1.1 deraadt 271: There are options (see
272: .Ic toggle
273: .Ic autoflush
274: and
275: .Ic toggle
276: .Ic autosynch
277: below)
278: which cause this action to flush subsequent output to the terminal
279: (until the remote host acknowledges the
280: .Tn TELNET
281: sequence) and flush previous terminal input
282: (in the case of
283: .Ic quit
284: and
1.22 aaron 285: .Ic intr ) .
1.1 deraadt 286: .Pp
287: While connected to a remote host,
1.22 aaron 288: .Nm
1.1 deraadt 289: command mode may be entered by typing the
1.22 aaron 290: .Nm
1.12 aaron 291: ``escape character'' (initially ``^]'').
1.1 deraadt 292: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 293: Note that the escape character will return to the command mode of the initial
1.18 alex 294: invocation of
1.22 aaron 295: .Nm
1.23 aaron 296: that has the controlling terminal.
297: Use the
1.15 aaron 298: .Cm send escape
299: command to switch to command mode in subsequent
1.22 aaron 300: .Nm
1.15 aaron 301: processes on remote hosts.
1.1 deraadt 302: .Pp
303: The following
1.22 aaron 304: .Nm
1.1 deraadt 305: commands are available.
306: Only enough of each command to uniquely identify it need be typed
307: (this is also true for arguments to the
1.12 aaron 308: .Ic mode ,
1.1 deraadt 309: .Ic set ,
1.12 aaron 310: .Ic toggle ,
1.1 deraadt 311: .Ic unset ,
1.12 aaron 312: .Ic slc ,
1.1 deraadt 313: .Ic environ ,
314: and
315: .Ic display
316: commands).
317: .Bl -tag -width "mode type"
1.16 aaron 318: .It Ic auth Ar argument Op Ar ...
1.12 aaron 319: The
320: .Ic auth
321: command manipulates the information sent through the
1.1 deraadt 322: .Dv TELNET AUTHENTICATE
1.22 aaron 323: option.
324: Valid arguments for the
325: .Ic auth
326: command are as follows:
1.1 deraadt 327: .Bl -tag -width "disable type"
328: .It Ic disable Ar type
1.12 aaron 329: Disables the specified
330: .Ar type
1.22 aaron 331: of authentication.
332: To obtain a list of available types, use the
1.1 deraadt 333: .Ic auth disable \&?
334: command.
335: .It Ic enable Ar type
1.12 aaron 336: Enables the specified
337: .Ar type
1.22 aaron 338: of authentication.
339: To obtain a list of available types, use the
1.1 deraadt 340: .Ic auth enable \&?
341: command.
342: .It Ic status
343: Lists the current status of the various types of
344: authentication.
345: .El
346: .It Ic close
347: Close a
348: .Tn TELNET
349: session and return to command mode.
1.16 aaron 350: .It Ic display Ar argument Op Ar ...
1.1 deraadt 351: Displays all, or some, of the
352: .Ic set
353: and
354: .Ic toggle
355: values (see below).
1.12 aaron 356: .It Ic encrypt Ar argument Op Ar ...
357: The
358: .Ic encrypt
359: command manipulates the information sent through the
1.1 deraadt 360: .Dv TELNET ENCRYPT
1.28 hin 361: option that's available when Kerberos is used.
1.14 aaron 362: .Pp
1.1 deraadt 363: Valid arguments for the encrypt command are as follows:
364: .Bl -tag -width Ar
365: .It Ic disable Ar type Ic [input|output]
1.12 aaron 366: Disables the specified
367: .Ar type
1.22 aaron 368: of encryption.
369: If you omit
1.12 aaron 370: .Ic input
371: and
372: .Ic output ,
373: both input and output
1.22 aaron 374: are disabled.
375: To obtain a list of available types, use the
1.1 deraadt 376: .Ic encrypt disable \&?
377: command.
378: .It Ic enable Ar type Ic [input|output]
1.12 aaron 379: Enables the specified
380: .Ar type
1.22 aaron 381: of encryption.
382: If you omit
1.12 aaron 383: .Ic input
384: and
385: .Ic output ,
386: both input and output are
1.22 aaron 387: enabled.
388: To obtain a list of available types, use the
1.1 deraadt 389: .Ic encrypt enable \&?
390: command.
391: .It Ic input
392: This is the same as the
393: .Ic encrypt start input
394: command.
395: .It Ic -input
396: This is the same as the
397: .Ic encrypt stop input
398: command.
399: .It Ic output
400: This is the same as the
401: .Ic encrypt start output
402: command.
403: .It Ic -output
404: This is the same as the
405: .Ic encrypt stop output
406: command.
407: .It Ic start Ic [input|output]
1.22 aaron 408: Attempts to start encryption.
409: If you omit
1.1 deraadt 410: .Ic input
411: and
1.24 aaron 412: .Ic output ,
1.22 aaron 413: both input and output are enabled.
414: To obtain a list of available types, use the
1.1 deraadt 415: .Ic encrypt enable \&?
416: command.
417: .It Ic status
418: Lists the current status of encryption.
419: .It Ic stop Ic [input|output]
1.22 aaron 420: Stops encryption.
421: If you omit
1.12 aaron 422: .Ic input
423: and
424: .Ic output ,
1.1 deraadt 425: encryption is on both input and output.
426: .It Ic type Ar type
427: Sets the default type of encryption to be used
428: with later
429: .Ic encrypt start
430: or
431: .Ic encrypt stop
432: commands.
433: .El
1.16 aaron 434: .It Ic environ Ar arguments Op Ar ...
1.1 deraadt 435: The
436: .Ic environ
437: command is used to manipulate the
1.11 deraadt 438: variables that may be sent through the
1.1 deraadt 439: .Dv TELNET ENVIRON
440: option.
441: The initial set of variables is taken from the users
442: environment, with only the
443: .Ev DISPLAY
444: and
445: .Ev PRINTER
446: variables being exported by default.
447: The
448: .Ev USER
449: variable is also exported if the
450: .Fl a
451: or
452: .Fl l
453: options are used.
454: .br
455: Valid arguments for the
456: .Ic environ
457: command are:
458: .Bl -tag -width Fl
1.16 aaron 459: .It Ic define Ar variable value
1.1 deraadt 460: Define the variable
461: .Ar variable
462: to have a value of
1.12 aaron 463: .Ar value .
1.1 deraadt 464: Any variables defined by this command are automatically exported.
465: The
466: .Ar value
467: may be enclosed in single or double quotes so
468: that tabs and spaces may be included.
1.16 aaron 469: .It Ic undefine Ar variable
1.1 deraadt 470: Remove
471: .Ar variable
472: from the list of environment variables.
1.16 aaron 473: .It Ic export Ar variable
1.1 deraadt 474: Mark the variable
475: .Ar variable
476: to be exported to the remote side.
1.16 aaron 477: .It Ic unexport Ar variable
1.1 deraadt 478: Mark the variable
479: .Ar variable
480: to not be exported unless
481: explicitly asked for by the remote side.
482: .It Ic list
483: List the current set of environment variables.
484: Those marked with a
485: .Cm *
486: will be sent automatically,
487: other variables will only be sent if explicitly requested.
488: .It Ic \&?
489: Prints out help information for the
490: .Ic environ
491: command.
492: .El
493: .It Ic logout
494: Sends the
495: .Dv TELNET LOGOUT
496: option to the remote side.
497: This command is similar to a
498: .Ic close
499: command; however, if the remote side does not support the
500: .Dv LOGOUT
501: option, nothing happens.
502: If, however, the remote side does support the
503: .Dv LOGOUT
504: option, this command should cause the remote side to close the
505: .Tn TELNET
506: connection.
507: If the remote side also supports the concept of
508: suspending a user's session for later reattachment,
509: the logout argument indicates that you
510: should terminate the session immediately.
1.16 aaron 511: .It Ic mode Ar type
1.12 aaron 512: .Ar type
1.1 deraadt 513: is one of several options, depending on the state of the
514: .Tn TELNET
515: session.
516: The remote host is asked for permission to go into the requested mode.
517: If the remote host is capable of entering that mode, the requested
518: mode will be entered.
519: .Bl -tag -width Ar
520: .It Ic character
521: Disable the
522: .Dv TELNET LINEMODE
523: option, or, if the remote side does not understand the
524: .Dv LINEMODE
1.12 aaron 525: option, then enter ``character at a time'' mode.
1.1 deraadt 526: .It Ic line
527: Enable the
528: .Dv TELNET LINEMODE
529: option, or, if the remote side does not understand the
530: .Dv LINEMODE
1.12 aaron 531: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 532: .It Ic isig Pq Ic \-isig
533: Attempt to enable (disable) the
1.1 deraadt 534: .Dv TRAPSIG
1.16 aaron 535: mode of the
1.1 deraadt 536: .Dv LINEMODE
537: option.
1.16 aaron 538: This requires that the
1.1 deraadt 539: .Dv LINEMODE
540: option be enabled.
1.16 aaron 541: .It Ic edit Pq Ic \-edit
542: Attempt to enable (disable) the
1.1 deraadt 543: .Dv EDIT
1.16 aaron 544: mode of the
1.1 deraadt 545: .Dv LINEMODE
546: option.
1.16 aaron 547: This requires that the
1.1 deraadt 548: .Dv LINEMODE
549: option be enabled.
1.16 aaron 550: .It Ic softtabs Pq Ic \-softtabs
551: Attempt to enable (disable) the
1.1 deraadt 552: .Dv SOFT_TAB
1.16 aaron 553: mode of the
1.1 deraadt 554: .Dv LINEMODE
555: option.
1.16 aaron 556: This requires that the
1.1 deraadt 557: .Dv LINEMODE
558: option be enabled.
1.16 aaron 559: .It Ic litecho Pq Ic \-litecho
560: Attempt to enable (disable) the
1.1 deraadt 561: .Dv LIT_ECHO
1.16 aaron 562: mode of the
1.1 deraadt 563: .Dv LINEMODE
564: option.
1.16 aaron 565: This requires that the
1.1 deraadt 566: .Dv LINEMODE
567: option be enabled.
568: .It Ic \&?
569: Prints out help information for the
570: .Ic mode
571: command.
572: .El
573: .It Xo
574: .Ic open Ar host
1.5 deraadt 575: .Op Fl l Ar user
576: .Oo Op Fl
1.1 deraadt 577: .Ar port Oc
578: .Xc
579: Open a connection to the named host.
580: If no port number
581: is specified,
1.22 aaron 582: .Nm
1.1 deraadt 583: will attempt to contact a
584: .Tn TELNET
585: server at the default port.
586: The host specification may be either a host name (see
1.7 deraadt 587: .Xr hosts 5 )
1.12 aaron 588: or an Internet address specified in the ``dot notation'' (see
1.1 deraadt 589: .Xr inet 3 ) .
590: The
1.5 deraadt 591: .Fl l
1.1 deraadt 592: option may be used to specify the user name
593: to be passed to the remote system via the
594: .Ev ENVIRON
595: option.
596: When connecting to a non-standard port,
1.22 aaron 597: .Nm
1.1 deraadt 598: omits any automatic initiation of
599: .Tn TELNET
1.22 aaron 600: options.
601: When the port number is preceded by a minus sign,
1.1 deraadt 602: the initial option negotiation is done.
603: After establishing a connection, the file
604: .Pa \&.telnetrc
605: in the
1.22 aaron 606: user's home directory is opened.
607: Lines beginning with a ``#'' are
608: comment lines.
609: Blank lines are ignored.
610: Lines that begin
611: without whitespace are the start of a machine entry.
612: The first thing on the line is the name of the machine that is
613: being connected to.
614: The rest of the line, and successive
1.21 aaron 615: lines that begin with whitespace are assumed to be
1.22 aaron 616: .Nm
1.1 deraadt 617: commands and are processed as if they had been typed
618: in manually to the
1.22 aaron 619: .Nm
1.1 deraadt 620: command prompt.
621: .It Ic quit
622: Close any open
623: .Tn TELNET
624: session and exit
1.12 aaron 625: .Nm telnet .
626: An end-of-file (in command mode) will also close a session and exit.
1.16 aaron 627: .It Ic send Ar arguments
1.1 deraadt 628: Sends one or more special character sequences to the remote host.
629: The following are the arguments which may be specified
630: (more than one argument may be specified at a time):
631: .Bl -tag -width escape
632: .It Ic abort
633: Sends the
634: .Dv TELNET ABORT
635: (Abort
636: processes)
637: sequence.
638: .It Ic ao
639: Sends the
640: .Dv TELNET AO
641: (Abort Output) sequence, which should cause the remote system to flush
642: all output
643: .Em from
644: the remote system
645: .Em to
646: the user's terminal.
647: .It Ic ayt
648: Sends the
649: .Dv TELNET AYT
650: (Are You There)
651: sequence, to which the remote system may or may not choose to respond.
652: .It Ic brk
653: Sends the
654: .Dv TELNET BRK
655: (Break) sequence, which may have significance to the remote
656: system.
657: .It Ic ec
658: Sends the
659: .Dv TELNET EC
660: (Erase Character)
661: sequence, which should cause the remote system to erase the last character
662: entered.
663: .It Ic el
664: Sends the
665: .Dv TELNET EL
666: (Erase Line)
667: sequence, which should cause the remote system to erase the line currently
668: being entered.
669: .It Ic eof
670: Sends the
671: .Dv TELNET EOF
672: (End Of File)
673: sequence.
674: .It Ic eor
675: Sends the
676: .Dv TELNET EOR
677: (End of Record)
678: sequence.
679: .It Ic escape
680: Sends the current
1.22 aaron 681: .Nm
1.12 aaron 682: escape character (initially ``^]'').
1.1 deraadt 683: .It Ic ga
684: Sends the
685: .Dv TELNET GA
686: (Go Ahead)
687: sequence, which likely has no significance to the remote system.
688: .It Ic getstatus
689: If the remote side supports the
690: .Dv TELNET STATUS
691: command,
692: .Ic getstatus
693: will send the subnegotiation to request that the server send
694: its current option status.
695: .It Ic ip
696: Sends the
697: .Dv TELNET IP
698: (Interrupt Process) sequence, which should cause the remote
699: system to abort the currently running process.
700: .It Ic nop
701: Sends the
702: .Dv TELNET NOP
703: (No OPeration)
704: sequence.
705: .It Ic susp
706: Sends the
707: .Dv TELNET SUSP
708: (SUSPend process)
709: sequence.
710: .It Ic synch
711: Sends the
712: .Dv TELNET SYNCH
713: sequence.
714: This sequence causes the remote system to discard all previously typed
715: (but not yet read) input.
716: This sequence is sent as
717: .Tn TCP
718: urgent
719: data (and may not work if the remote system is a
720: .Bx 4.2
721: system -- if
1.12 aaron 722: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 723: .It Ic do Ar cmd
1.12 aaron 724: Sends the
725: .Dv TELNET DO
726: .Ar cmd
727: sequence.
728: .Ar cmd
729: can be either a decimal number between 0 and 255,
730: or a symbolic name for a specific
731: .Dv TELNET
732: command.
733: .Ar cmd
734: can also be either
735: .Ic help
736: or
737: .Ic \&?
738: to print out help information, including
739: a list of known symbolic names.
1.1 deraadt 740: .It Ic dont Ar cmd
1.12 aaron 741: Sends the
742: .Dv TELNET DONT
743: .Ar cmd
744: sequence.
745: .Ar cmd
746: can be either a decimal number between 0 and 255,
747: or a symbolic name for a specific
748: .Dv TELNET
749: command.
750: .Ar cmd
751: can also be either
752: .Ic help
753: or
754: .Ic \&?
755: to print out help information, including
756: a list of known symbolic names.
1.1 deraadt 757: .It Ic will Ar cmd
1.12 aaron 758: Sends the
759: .Dv TELNET WILL
760: .Ar cmd
761: sequence.
762: .Ar cmd
763: can be either a decimal number between 0 and 255,
764: or a symbolic name for a specific
765: .Dv TELNET
766: command.
767: .Ar cmd
768: can also be either
769: .Ic help
770: or
771: .Ic \&?
772: to print out help information, including
773: a list of known symbolic names.
1.1 deraadt 774: .It Ic wont Ar cmd
775: Sends the
1.12 aaron 776: .Dv TELNET WONT
1.1 deraadt 777: .Ar cmd
778: sequence.
1.12 aaron 779: .Ar cmd
1.1 deraadt 780: can be either a decimal number between 0 and 255,
781: or a symbolic name for a specific
782: .Dv TELNET
783: command.
1.12 aaron 784: .Ar cmd
1.1 deraadt 785: can also be either
786: .Ic help
787: or
788: .Ic \&?
789: to print out help information, including
790: a list of known symbolic names.
791: .It Ic \&?
792: Prints out help information for the
793: .Ic send
794: command.
795: .El
1.16 aaron 796: .It Ic set Ar argument value
797: .It Ic unset Ar argument value
1.1 deraadt 798: The
799: .Ic set
800: command will set any one of a number of
1.22 aaron 801: .Nm
1.1 deraadt 802: variables to a specific value or to
803: .Dv TRUE .
804: The special value
805: .Ic off
806: turns off the function associated with
1.12 aaron 807: the variable; this is equivalent to using the
1.1 deraadt 808: .Ic unset
809: command.
810: The
811: .Ic unset
812: command will disable or set to
813: .Dv FALSE
814: any of the specified functions.
815: The values of variables may be interrogated with the
816: .Ic display
817: command.
818: The variables which may be set or unset, but not toggled, are
1.22 aaron 819: listed here.
820: In addition, any of the variables for the
1.1 deraadt 821: .Ic toggle
822: command may be explicitly set or unset using
823: the
824: .Ic set
825: and
826: .Ic unset
827: commands.
828: .Bl -tag -width escape
829: .It Ic ayt
830: If
831: .Tn TELNET
1.12 aaron 832: is in
833: .Ic localchars
834: mode, or
1.1 deraadt 835: .Dv LINEMODE
836: is enabled, and the status character is typed, a
837: .Dv TELNET AYT
838: sequence (see
839: .Ic send ayt
840: preceding) is sent to the
1.22 aaron 841: remote host.
842: The initial value for the "Are You There"
1.1 deraadt 843: character is the terminal's status character.
844: .It Ic echo
1.12 aaron 845: This is the value (initially ``^E'') which, when in
846: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 847: of entered characters (for normal processing), and suppressing
848: echoing of entered characters (for entering, say, a password).
849: .It Ic eof
850: If
1.22 aaron 851: .Nm
1.1 deraadt 852: is operating in
853: .Dv LINEMODE
1.12 aaron 854: or ``old line by line'' mode, entering this character
1.1 deraadt 855: as the first character on a line will cause this character to be
856: sent to the remote system.
1.12 aaron 857: The initial value of the
858: .Ic eof
859: character is taken to be the terminal's
1.1 deraadt 860: .Ic eof
861: character.
862: .It Ic erase
863: If
1.22 aaron 864: .Nm
1.1 deraadt 865: is in
866: .Ic localchars
867: mode (see
868: .Ic toggle
869: .Ic localchars
870: below),
1.12 aaron 871: and if
1.22 aaron 872: .Nm
1.12 aaron 873: is operating in ``character at a time'' mode, then when this
1.1 deraadt 874: character is typed, a
875: .Dv TELNET EC
876: sequence (see
877: .Ic send
878: .Ic ec
879: above)
880: is sent to the remote system.
1.12 aaron 881: The initial value for the
882: .Ic erase
883: character is taken to be
1.1 deraadt 884: the terminal's
885: .Ic erase
886: character.
887: .It Ic escape
888: This is the
1.22 aaron 889: .Nm
1.12 aaron 890: escape character (initially ``^['') which causes entry
1.1 deraadt 891: into
1.22 aaron 892: .Nm
1.1 deraadt 893: command mode (when connected to a remote system).
894: .It Ic flushoutput
895: If
1.22 aaron 896: .Nm
1.1 deraadt 897: is in
898: .Ic localchars
899: mode (see
900: .Ic toggle
901: .Ic localchars
902: below)
903: and the
904: .Ic flushoutput
905: character is typed, a
906: .Dv TELNET AO
907: sequence (see
908: .Ic send
909: .Ic ao
910: above)
911: is sent to the remote host.
1.12 aaron 912: The initial value for the
913: .Ic flush
914: character is taken to be
1.1 deraadt 915: the terminal's
916: .Ic flush
917: character.
918: .It Ic forw1
919: .It Ic forw2
920: If
921: .Tn TELNET
922: is operating in
923: .Dv LINEMODE ,
924: these are the
925: characters that, when typed, cause partial lines to be
1.22 aaron 926: forwarded to the remote system.
927: The initial value for
1.1 deraadt 928: the forwarding characters are taken from the terminal's
929: eol and eol2 characters.
930: .It Ic interrupt
931: If
1.22 aaron 932: .Nm
1.1 deraadt 933: is in
934: .Ic localchars
935: mode (see
936: .Ic toggle
937: .Ic localchars
938: below)
939: and the
940: .Ic interrupt
941: character is typed, a
942: .Dv TELNET IP
943: sequence (see
944: .Ic send
945: .Ic ip
946: above)
947: is sent to the remote host.
1.12 aaron 948: The initial value for the
949: .Ic interrupt
950: character is taken to be
1.1 deraadt 951: the terminal's
952: .Ic intr
953: character.
954: .It Ic kill
955: If
1.22 aaron 956: .Nm
1.1 deraadt 957: is in
958: .Ic localchars
959: mode (see
960: .Ic toggle
961: .Ic localchars
962: below),
1.12 aaron 963: and if
1.22 aaron 964: .Nm
1.12 aaron 965: is operating in ``character at a time'' mode, then when this
1.1 deraadt 966: character is typed, a
967: .Dv TELNET EL
968: sequence (see
969: .Ic send
970: .Ic el
971: above)
972: is sent to the remote system.
1.12 aaron 973: The initial value for the
974: .Ic kill
975: character is taken to be
1.1 deraadt 976: the terminal's
977: .Ic kill
978: character.
979: .It Ic lnext
980: If
1.22 aaron 981: .Nm
1.1 deraadt 982: is operating in
983: .Dv LINEMODE
1.12 aaron 984: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 985: be the terminal's
986: .Ic lnext
987: character.
1.12 aaron 988: The initial value for the
989: .Ic lnext
990: character is taken to be
1.1 deraadt 991: the terminal's
992: .Ic lnext
993: character.
994: .It Ic quit
995: If
1.22 aaron 996: .Nm
1.1 deraadt 997: is in
998: .Ic localchars
999: mode (see
1000: .Ic toggle
1001: .Ic localchars
1002: below)
1003: and the
1004: .Ic quit
1005: character is typed, a
1006: .Dv TELNET BRK
1007: sequence (see
1008: .Ic send
1009: .Ic brk
1010: above)
1011: is sent to the remote host.
1.12 aaron 1012: The initial value for the
1013: .Ic quit
1014: character is taken to be
1.1 deraadt 1015: the terminal's
1016: .Ic quit
1017: character.
1018: .It Ic reprint
1019: If
1.22 aaron 1020: .Nm
1.1 deraadt 1021: is operating in
1022: .Dv LINEMODE
1.31 deraadt 1023: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1024: be the terminal's
1025: .Ic reprint
1026: character.
1.12 aaron 1027: The initial value for the
1028: .Ic reprint
1029: character is taken to be
1.1 deraadt 1030: the terminal's
1031: .Ic reprint
1032: character.
1033: .It Ic rlogin
1034: This is the rlogin escape character.
1035: If set, the normal
1036: .Tn TELNET
1037: escape character is ignored unless it is
1038: preceded by this character at the beginning of a line.
1.12 aaron 1039: This character, at the beginning of a line, followed by
1040: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1041: suspends the
1.22 aaron 1042: .Nm
1043: command.
1044: The initial state is to
1.12 aaron 1045: disable the
1046: .Ic rlogin
1047: escape character.
1.1 deraadt 1048: .It Ic start
1049: If the
1050: .Dv TELNET TOGGLE-FLOW-CONTROL
1051: option has been enabled,
1052: then this character is taken to
1053: be the terminal's
1054: .Ic start
1055: character.
1.12 aaron 1056: The initial value for the
1057: .Ic start
1058: character is taken to be
1.1 deraadt 1059: the terminal's
1060: .Ic start
1061: character.
1062: .It Ic stop
1063: If the
1064: .Dv TELNET TOGGLE-FLOW-CONTROL
1065: option has been enabled,
1066: then this character is taken to
1067: be the terminal's
1068: .Ic stop
1069: character.
1.12 aaron 1070: The initial value for the
1071: .Ic stop
1072: character is taken to be
1.1 deraadt 1073: the terminal's
1074: .Ic stop
1075: character.
1076: .It Ic susp
1077: If
1.22 aaron 1078: .Nm
1.1 deraadt 1079: is in
1080: .Ic localchars
1081: mode, or
1082: .Dv LINEMODE
1083: is enabled, and the
1084: .Ic suspend
1085: character is typed, a
1086: .Dv TELNET SUSP
1087: sequence (see
1088: .Ic send
1089: .Ic susp
1090: above)
1091: is sent to the remote host.
1.12 aaron 1092: The initial value for the
1093: .Ic suspend
1094: character is taken to be
1.1 deraadt 1095: the terminal's
1096: .Ic suspend
1097: character.
1098: .It Ic tracefile
1099: This is the file to which the output, caused by
1100: .Ic netdata
1101: or
1102: .Ic option
1103: tracing being
1104: .Dv TRUE ,
1.22 aaron 1105: will be written.
1106: If it is set to
1.1 deraadt 1107: .Dq Fl ,
1108: then tracing information will be written to standard output (the default).
1109: .It Ic worderase
1110: If
1.22 aaron 1111: .Nm
1.1 deraadt 1112: is operating in
1113: .Dv LINEMODE
1.12 aaron 1114: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1115: be the terminal's
1116: .Ic worderase
1117: character.
1.12 aaron 1118: The initial value for the
1119: .Ic worderase
1120: character is taken to be
1.1 deraadt 1121: the terminal's
1122: .Ic worderase
1123: character.
1124: .It Ic \&?
1125: Displays the legal
1126: .Ic set
1127: .Pq Ic unset
1128: commands.
1129: .El
1.17 aaron 1130: .It Ic skey Ar sequence challenge
1131: The
1132: .Ic skey
1.23 aaron 1133: command computes a response to the S/Key challenge.
1134: See
1.17 aaron 1135: .Xr skey 1
1136: for more information on the S/Key system.
1.16 aaron 1137: .It Ic slc Ar state
1.1 deraadt 1138: The
1139: .Ic slc
1140: command (Set Local Characters) is used to set
1.4 deraadt 1141: or change the state of the special
1.16 aaron 1142: characters when the
1.1 deraadt 1143: .Dv TELNET LINEMODE
1144: option has
1.22 aaron 1145: been enabled.
1146: Special characters are characters that get mapped to
1.1 deraadt 1147: .Tn TELNET
1148: commands sequences (like
1149: .Ic ip
1150: or
1.22 aaron 1151: .Ic quit )
1.1 deraadt 1152: or line editing characters (like
1153: .Ic erase
1154: and
1.22 aaron 1155: .Ic kill ) .
1.1 deraadt 1156: By default, the local special characters are exported.
1157: .Bl -tag -width Fl
1158: .It Ic check
1159: Verify the current settings for the current special characters.
1160: The remote side is requested to send all the current special
1161: character settings, and if there are any discrepancies with
1162: the local side, the local side will switch to the remote value.
1163: .It Ic export
1.22 aaron 1164: Switch to the local defaults for the special characters.
1165: The local default characters are those of the local terminal at
1.1 deraadt 1166: the time when
1.22 aaron 1167: .Nm
1.1 deraadt 1168: was started.
1169: .It Ic import
1170: Switch to the remote defaults for the special characters.
1171: The remote default characters are those of the remote system
1.16 aaron 1172: at the time when the
1.1 deraadt 1173: .Tn TELNET
1174: connection was established.
1175: .It Ic \&?
1176: Prints out help information for the
1177: .Ic slc
1178: command.
1179: .El
1180: .It Ic status
1181: Show the current status of
1.12 aaron 1182: .Nm telnet .
1.1 deraadt 1183: This includes the peer one is connected to, as well
1184: as the current mode.
1.16 aaron 1185: .It Ic toggle Ar arguments Op Ar ...
1.1 deraadt 1186: Toggle (between
1187: .Dv TRUE
1188: and
1189: .Dv FALSE )
1190: various flags that control how
1.22 aaron 1191: .Nm
1.1 deraadt 1192: responds to events.
1193: These flags may be set explicitly to
1194: .Dv TRUE
1195: or
1196: .Dv FALSE
1197: using the
1198: .Ic set
1199: and
1200: .Ic unset
1201: commands listed above.
1202: More than one argument may be specified.
1203: The state of these flags may be interrogated with the
1204: .Ic display
1205: command.
1206: Valid arguments are:
1207: .Bl -tag -width Ar
1208: .It Ic authdebug
1209: Turns on debugging information for the authentication code.
1210: .It Ic autoflush
1211: If
1212: .Ic autoflush
1213: and
1214: .Ic localchars
1215: are both
1216: .Dv TRUE ,
1217: then when the
1.12 aaron 1218: .Ic ao
1.1 deraadt 1219: or
1220: .Ic quit
1221: characters are recognized (and transformed into
1222: .Tn TELNET
1223: sequences; see
1224: .Ic set
1225: above for details),
1.22 aaron 1226: .Nm
1.1 deraadt 1227: refuses to display any data on the user's terminal
1228: until the remote system acknowledges (via a
1229: .Dv TELNET TIMING MARK
1230: option)
1231: that it has processed those
1232: .Tn TELNET
1233: sequences.
1234: The initial value for this toggle is
1235: .Dv TRUE
1236: if the terminal user had not
1237: done an "stty noflsh", otherwise
1238: .Dv FALSE
1239: (see
1.22 aaron 1240: .Xr stty 1 ) .
1.1 deraadt 1241: .It Ic autodecrypt
1242: When the
1243: .Dv TELNET ENCRYPT
1244: option is negotiated, by
1245: default the actual encryption (decryption) of the data
1.22 aaron 1246: stream does not start automatically.
1247: The
1.12 aaron 1248: .Ic autoencrypt
1249: .Pq Ic autodecrypt
1250: command states that encryption of the
1.1 deraadt 1251: output (input) stream should be enabled as soon as
1252: possible.
1253: .Pp
1254: .It Ic autologin
1255: If the remote side supports the
1256: .Dv TELNET AUTHENTICATION
1257: option
1258: .Tn TELNET
1.22 aaron 1259: attempts to use it to perform automatic authentication.
1260: If the
1.1 deraadt 1261: .Dv AUTHENTICATION
1262: option is not supported, the user's login
1.31 deraadt 1263: name is propagated through the
1.1 deraadt 1264: .Dv TELNET ENVIRON
1265: option.
1266: This command is the same as specifying
1267: .Ar a
1268: option on the
1269: .Ic open
1270: command.
1271: .It Ic autosynch
1272: If
1273: .Ic autosynch
1274: and
1275: .Ic localchars
1276: are both
1277: .Dv TRUE ,
1278: then when either the
1279: .Ic intr
1280: or
1281: .Ic quit
1.12 aaron 1282: character is typed (see
1.1 deraadt 1283: .Ic set
1284: above for descriptions of the
1285: .Ic intr
1286: and
1287: .Ic quit
1288: characters), the resulting
1289: .Tn TELNET
1290: sequence sent is followed by the
1291: .Dv TELNET SYNCH
1292: sequence.
1293: This procedure
1.12 aaron 1294: .Em should
1.1 deraadt 1295: cause the remote system to begin throwing away all previously
1296: typed input until both of the
1297: .Tn TELNET
1298: sequences have been read and acted upon.
1299: The initial value of this toggle is
1300: .Dv FALSE .
1301: .It Ic binary
1302: Enable or disable the
1303: .Dv TELNET BINARY
1304: option on both input and output.
1305: .It Ic inbinary
1306: Enable or disable the
1307: .Dv TELNET BINARY
1308: option on input.
1309: .It Ic outbinary
1310: Enable or disable the
1311: .Dv TELNET BINARY
1312: option on output.
1313: .It Ic crlf
1314: If this is
1315: .Dv TRUE ,
1316: then carriage returns will be sent as
1317: .Li <CR><LF> .
1318: If this is
1319: .Dv FALSE ,
1.31 deraadt 1320: then carriage returns will be sent as
1.1 deraadt 1321: .Li <CR><NUL> .
1322: The initial value for this toggle is
1323: .Dv FALSE .
1324: .It Ic crmod
1325: Toggle carriage return mode.
1326: When this mode is enabled, most carriage return characters received from
1327: the remote host will be mapped into a carriage return followed by
1328: a line feed.
1329: This mode does not affect those characters typed by the user, only
1330: those received from the remote host.
1331: This mode is not very useful unless the remote host
1.12 aaron 1332: only sends carriage return, but never line feeds.
1.1 deraadt 1333: The initial value for this toggle is
1334: .Dv FALSE .
1335: .It Ic debug
1.25 aaron 1336: Toggles socket level debugging (useful only to the superuser).
1.1 deraadt 1337: The initial value for this toggle is
1338: .Dv FALSE .
1339: .It Ic encdebug
1340: Turns on debugging information for the encryption code.
1341: .It Ic localchars
1342: If this is
1343: .Dv TRUE ,
1344: then the
1.12 aaron 1345: .Ic flush ,
1.1 deraadt 1346: .Ic interrupt ,
1.12 aaron 1347: .Ic quit ,
1.1 deraadt 1348: .Ic erase ,
1349: and
1350: .Ic kill
1351: characters (see
1352: .Ic set
1353: above) are recognized locally, and transformed into (hopefully) appropriate
1354: .Tn TELNET
1355: control sequences
1356: (respectively
1.12 aaron 1357: .Ic ao ,
1.1 deraadt 1358: .Ic ip ,
1.12 aaron 1359: .Ic brk ,
1.1 deraadt 1360: .Ic ec ,
1361: and
1.22 aaron 1362: .Ic el ;
1.1 deraadt 1363: see
1364: .Ic send
1365: above).
1366: The initial value for this toggle is
1367: .Dv TRUE
1.12 aaron 1368: in ``old line by line'' mode,
1.1 deraadt 1369: and
1370: .Dv FALSE
1.12 aaron 1371: in ``character at a time'' mode.
1.1 deraadt 1372: When the
1373: .Dv LINEMODE
1374: option is enabled, the value of
1375: .Ic localchars
1376: is ignored, and assumed to always be
1377: .Dv TRUE .
1378: If
1379: .Dv LINEMODE
1380: has ever been enabled, then
1381: .Ic quit
1382: is sent as
1.12 aaron 1383: .Ic abort ,
1384: and
1385: .Ic eof
1.1 deraadt 1386: and
1.5 deraadt 1387: .Ic suspend
1.1 deraadt 1388: are sent as
1.12 aaron 1389: .Ic eof
1390: and
1.5 deraadt 1391: .Ic susp
1392: (see
1.1 deraadt 1393: .Ic send
1394: above).
1395: .It Ic netdata
1396: Toggles the display of all network data (in hexadecimal format).
1397: The initial value for this toggle is
1398: .Dv FALSE .
1399: .It Ic options
1400: Toggles the display of some internal
1.22 aaron 1401: .Nm
1.1 deraadt 1402: protocol processing (having to do with
1403: .Tn TELNET
1404: options).
1405: The initial value for this toggle is
1406: .Dv FALSE .
1407: .It Ic prettydump
1408: When the
1409: .Ic netdata
1410: toggle is enabled, if
1411: .Ic prettydump
1412: is enabled the output from the
1413: .Ic netdata
1414: command will be formatted in a more user readable format.
1415: Spaces are put between each character in the output, and the
1416: beginning of any
1417: .Tn TELNET
1418: escape sequence is preceded by a '*' to aid in locating them.
1419: .It Ic skiprc
1420: When the skiprc toggle is
1421: .Dv TRUE ,
1422: .Tn TELNET
1423: skips the reading of the
1424: .Pa \&.telnetrc
1.12 aaron 1425: file in the user's home
1.22 aaron 1426: directory when connections are opened.
1427: The initial value for this toggle is
1.13 aaron 1428: .Dv FALSE .
1.1 deraadt 1429: .It Ic termdata
1430: Toggles the display of all terminal data (in hexadecimal format).
1431: The initial value for this toggle is
1432: .Dv FALSE .
1433: .It Ic verbose_encrypt
1434: When the
1435: .Ic verbose_encrypt
1436: toggle is
1437: .Dv TRUE ,
1.22 aaron 1438: .Nm
1.1 deraadt 1439: prints out a message each time encryption is enabled or
1.22 aaron 1440: disabled.
1441: The initial value for this toggle is
1.13 aaron 1442: .Dv FALSE .
1.1 deraadt 1443: .It Ic \&?
1444: Displays the legal
1445: .Ic toggle
1446: commands.
1447: .El
1448: .It Ic z
1449: Suspend
1.12 aaron 1450: .Nm telnet .
1.1 deraadt 1451: This command only works when the user is using the
1.12 aaron 1452: .Xr csh 1 .
1.16 aaron 1453: .It Ic \&! Op Ar command
1.1 deraadt 1454: Execute a single command in a subshell on the local
1.22 aaron 1455: system.
1456: If
1.5 deraadt 1457: .Ar command
1.1 deraadt 1458: is omitted, then an interactive
1459: subshell is invoked.
1.16 aaron 1460: .It Ic \&? Op Ar command
1.22 aaron 1461: Get help.
1462: With no arguments,
1463: .Nm
1.1 deraadt 1464: prints a help summary.
1465: If a command is specified,
1.22 aaron 1466: .Nm
1.1 deraadt 1467: will print the help information for just that command.
1468: .El
1469: .Sh ENVIRONMENT
1.22 aaron 1470: .Nm
1.1 deraadt 1471: uses at least the
1472: .Ev HOME ,
1473: .Ev SHELL ,
1474: .Ev DISPLAY ,
1475: and
1476: .Ev TERM
1477: environment variables.
1478: Other environment variables may be propagated
1479: to the other side via the
1480: .Dv TELNET ENVIRON
1481: option.
1482: .Sh FILES
1483: .Bl -tag -width ~/.telnetrc -compact
1484: .It Pa ~/.telnetrc
1485: user customized telnet startup values
1486: .El
1487: .Sh HISTORY
1488: The
1.22 aaron 1489: .Nm
1.1 deraadt 1490: command appeared in
1491: .Bx 4.2 .
1492: .Sh NOTES
1493: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1494: ``old line by line'' mode.
1.1 deraadt 1495: .Pp
1.16 aaron 1496: In ``old line by line'' mode or
1.1 deraadt 1497: .Dv LINEMODE
1498: the terminal's
1499: .Ic eof
1500: character is only recognized (and sent to the remote system)
1501: when it is the first character on a line.
1.20 itojun 1502: .Pp
1503: Source routing is not supported yet for IPv6.
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