Annotation of src/usr.bin/telnet/telnet.1, Revision 1.41
1.41 ! claudio 1: .\" $OpenBSD: telnet.1,v 1.40 2007/08/06 19:16:05 sobrado Exp $
1.2 niklas 2: .\" $NetBSD: telnet.1,v 1.5 1996/02/28 21:04:12 thorpej Exp $
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1.41 ! claudio 33: .Dd $Mdocdate: August 6 2007 $
1.1 deraadt 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
1.38 jmc 44: .Op Fl 468acdEFfKLrx
1.3 niklas 45: .Op Fl b Ar hostalias
1.1 deraadt 46: .Op Fl e Ar escapechar
47: .Op Fl k Ar realm
48: .Op Fl l Ar user
49: .Op Fl n Ar tracefile
1.41 ! claudio 50: .Op Fl V Ar rdomain
1.38 jmc 51: .Op Fl X Ar authtype
1.1 deraadt 52: .Oo
53: .Ar host
1.9 deraadt 54: .Op Ar port
1.1 deraadt 55: .Oc
1.31 deraadt 56: .Ek
1.1 deraadt 57: .Sh DESCRIPTION
58: The
1.22 aaron 59: .Nm
1.1 deraadt 60: command
1.16 aaron 61: is used to communicate with another host using the
1.1 deraadt 62: .Tn TELNET
63: protocol.
64: If
1.22 aaron 65: .Nm
1.1 deraadt 66: is invoked without the
67: .Ar host
68: argument, it enters command mode,
69: indicated by its prompt
70: .Pq Nm telnet\&> .
71: In this mode, it accepts and executes the commands listed below.
72: If it is invoked with arguments, it performs an
73: .Ic open
74: command with those arguments.
75: .Pp
1.19 aaron 76: The options are as follows:
1.27 aaron 77: .Bl -tag -width Ds
1.37 otto 78: .It Fl 4
79: Forces
80: .Nm
81: to use IPv4 addresses only.
82: .It Fl 6
83: Forces
84: .Nm
85: to use IPv6 addresses only.
1.1 deraadt 86: .It Fl 8
1.22 aaron 87: Specifies an 8-bit data path.
88: This causes an attempt to negotiate the
1.1 deraadt 89: .Dv TELNET BINARY
90: option on both input and output.
91: .It Fl a
92: Attempt automatic login.
93: Currently, this sends the user name via the
94: .Ev USER
95: variable
96: of the
97: .Ev ENVIRON
98: option if supported by the remote system.
99: The name used is that of the current user as returned by
100: .Xr getlogin 2
101: if it agrees with the current user ID,
102: otherwise it is the name associated with the user ID.
1.3 niklas 103: .It Fl b Ar hostalias
104: Uses
105: .Xr bind 2
1.12 aaron 106: on the local socket to bind it to an aliased address (see
1.3 niklas 107: .Xr ifconfig 8
1.12 aaron 108: and the ``alias'' specifier) or to the address of
1.3 niklas 109: another interface than the one naturally chosen by
110: .Xr connect 2 .
1.12 aaron 111: This can be useful when connecting to services which use IP addresses
1.3 niklas 112: for authentication and reconfiguration of the server is undesirable (or
113: impossible).
1.1 deraadt 114: .It Fl c
115: Disables the reading of the user's
116: .Pa \&.telnetrc
1.22 aaron 117: file.
118: (See the
1.1 deraadt 119: .Ic toggle skiprc
120: command on this man page.)
121: .It Fl d
122: Sets the initial value of the
123: .Ic debug
124: toggle to
1.12 aaron 125: .Dv TRUE .
1.38 jmc 126: .It Fl E
127: Stops any character from being recognized as an escape character.
1.16 aaron 128: .It Fl e Ar escapechar
1.1 deraadt 129: Sets the initial
130: .Nm
131: escape character to
1.33 jmc 132: .Ar escapechar .
1.1 deraadt 133: If
1.8 deraadt 134: .Ar escapechar
1.1 deraadt 135: is omitted, then
136: there will be no escape character.
1.38 jmc 137: .It Fl F
138: If Kerberos authentication is being used, the
139: .Fl F
140: option allows the local credentials to be forwarded
141: to the remote system, including any credentials that
142: have already been forwarded into the local environment.
1.1 deraadt 143: .It Fl f
1.34 jmc 144: If Kerberos authentication is being used, the
1.1 deraadt 145: .Fl f
146: option allows the local credentials to be forwarded to the remote system.
1.38 jmc 147: .It Fl K
148: Specifies no automatic login to the remote system.
1.1 deraadt 149: .It Fl k Ar realm
150: If Kerberos authentication is being used, the
151: .Fl k
1.12 aaron 152: option requests that
1.22 aaron 153: .Nm
1.12 aaron 154: obtain tickets for the remote host in
1.8 deraadt 155: realm
156: .Ar realm
1.34 jmc 157: instead of the remote host's realm.
1.38 jmc 158: .It Fl L
159: Specifies an 8-bit data path on output.
160: This causes the BINARY option to be negotiated on output.
1.16 aaron 161: .It Fl l Ar user
1.1 deraadt 162: When connecting to the remote system, if the remote system
163: understands the
164: .Ev ENVIRON
165: option, then
166: .Ar user
167: will be sent to the remote system as the value for the variable USER.
168: This option implies the
169: .Fl a
170: option.
171: This option may also be used with the
172: .Ic open
173: command.
1.16 aaron 174: .It Fl n Ar tracefile
1.1 deraadt 175: Opens
176: .Ar tracefile
177: for recording trace information.
178: See the
179: .Ic set tracefile
180: command below.
181: .It Fl r
182: Specifies a user interface similar to
1.30 millert 183: .Nm rlogin .
1.1 deraadt 184: In this
185: mode, the escape character is set to the tilde (~) character,
1.8 deraadt 186: unless modified by the
187: .Fl e
188: option.
1.41 ! claudio 189: .It Fl V Ar rdomain
! 190: Set the routing domain, the default is 0.
1.38 jmc 191: .It Fl X Ar authtype
192: Disables the
193: .Ar authtype
194: type of authentication.
1.1 deraadt 195: .It Fl x
1.33 jmc 196: Turn on encryption of the data stream.
197: When this option is turned on,
1.29 hin 198: .Nm
199: will exit with an error if authentication cannot be negotiated or if
200: encryption cannot be turned on.
1.1 deraadt 201: .It Ar host
202: Indicates the official name, an alias, or the Internet address
203: of a remote host.
204: .It Ar port
1.22 aaron 205: Indicates a port number (address of an application).
206: If a number is not specified, the default
207: .Nm
1.1 deraadt 208: port is used.
209: .El
210: .Pp
1.36 jmc 211: When in rlogin mode, a line of the form ~.\&
1.22 aaron 212: disconnects from the
1.1 deraadt 213: remote host; ~ is the telnet escape character.
214: Similarly, the line ~^Z suspends the telnet session.
215: The line ~^] escapes to the normal telnet escape prompt.
216: .Pp
217: Once a connection has been opened,
1.22 aaron 218: .Nm
1.1 deraadt 219: will attempt to enable the
220: .Dv TELNET LINEMODE
221: option.
1.12 aaron 222: If this fails,
1.22 aaron 223: .Nm
1.1 deraadt 224: will revert to one of two input modes:
1.12 aaron 225: either ``character at a time''
226: or ``old line by line''
1.1 deraadt 227: depending on what the remote system supports.
228: .Pp
1.16 aaron 229: When
1.1 deraadt 230: .Dv LINEMODE
231: is enabled, character processing is done on the
1.22 aaron 232: local system, under the control of the remote system.
233: When input
1.1 deraadt 234: editing or character echoing is to be disabled, the remote system
1.22 aaron 235: will relay that information.
236: The remote system will also relay
1.1 deraadt 237: changes to any special characters that happen on the remote
238: system, so that they can take effect on the local system.
239: .Pp
1.12 aaron 240: In ``character at a time'' mode, most
1.1 deraadt 241: text typed is immediately sent to the remote host for processing.
242: .Pp
1.12 aaron 243: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 244: and (normally) only completed lines are sent to the remote host.
1.12 aaron 245: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 246: to turn off and on the local echo
247: (this would mostly be used to enter passwords
248: without the password being echoed).
249: .Pp
1.16 aaron 250: If the
1.1 deraadt 251: .Dv LINEMODE
252: option is enabled, or if the
253: .Ic localchars
254: toggle is
255: .Dv TRUE
1.12 aaron 256: (the default for ``old line by line''; see below),
1.1 deraadt 257: the user's
1.12 aaron 258: .Ic quit ,
1.1 deraadt 259: .Ic intr ,
260: and
261: .Ic flush
262: characters are trapped locally, and sent as
263: .Tn TELNET
264: protocol sequences to the remote side.
1.16 aaron 265: If
1.1 deraadt 266: .Dv LINEMODE
267: has ever been enabled, then the user's
268: .Ic susp
269: and
270: .Ic eof
271: are also sent as
272: .Tn TELNET
273: protocol sequences,
274: and
275: .Ic quit
1.16 aaron 276: is sent as a
1.1 deraadt 277: .Dv TELNET ABORT
1.16 aaron 278: instead of
1.8 deraadt 279: .Dv BREAK .
1.1 deraadt 280: There are options (see
281: .Ic toggle
282: .Ic autoflush
283: and
284: .Ic toggle
285: .Ic autosynch
286: below)
287: which cause this action to flush subsequent output to the terminal
288: (until the remote host acknowledges the
289: .Tn TELNET
290: sequence) and flush previous terminal input
291: (in the case of
292: .Ic quit
293: and
1.22 aaron 294: .Ic intr ) .
1.1 deraadt 295: .Pp
296: While connected to a remote host,
1.22 aaron 297: .Nm
1.1 deraadt 298: command mode may be entered by typing the
1.22 aaron 299: .Nm
1.12 aaron 300: ``escape character'' (initially ``^]'').
1.1 deraadt 301: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 302: Note that the escape character will return to the command mode of the initial
1.18 alex 303: invocation of
1.22 aaron 304: .Nm
1.23 aaron 305: that has the controlling terminal.
306: Use the
1.15 aaron 307: .Cm send escape
308: command to switch to command mode in subsequent
1.22 aaron 309: .Nm
1.15 aaron 310: processes on remote hosts.
1.1 deraadt 311: .Pp
312: The following
1.22 aaron 313: .Nm
1.1 deraadt 314: commands are available.
315: Only enough of each command to uniquely identify it need be typed
316: (this is also true for arguments to the
1.12 aaron 317: .Ic mode ,
1.1 deraadt 318: .Ic set ,
1.12 aaron 319: .Ic toggle ,
1.1 deraadt 320: .Ic unset ,
1.12 aaron 321: .Ic slc ,
1.1 deraadt 322: .Ic environ ,
323: and
324: .Ic display
325: commands).
326: .Bl -tag -width "mode type"
1.40 sobrado 327: .It Ic auth Ar argument ...
1.12 aaron 328: The
329: .Ic auth
330: command manipulates the information sent through the
1.1 deraadt 331: .Dv TELNET AUTHENTICATE
1.22 aaron 332: option.
333: Valid arguments for the
334: .Ic auth
335: command are as follows:
1.1 deraadt 336: .Bl -tag -width "disable type"
337: .It Ic disable Ar type
1.12 aaron 338: Disables the specified
339: .Ar type
1.22 aaron 340: of authentication.
341: To obtain a list of available types, use the
1.35 jmc 342: .Ic auth disable ?\&
1.1 deraadt 343: command.
344: .It Ic enable Ar type
1.12 aaron 345: Enables the specified
346: .Ar type
1.22 aaron 347: of authentication.
348: To obtain a list of available types, use the
1.35 jmc 349: .Ic auth enable ?\&
1.1 deraadt 350: command.
351: .It Ic status
352: Lists the current status of the various types of
353: authentication.
354: .El
355: .It Ic close
356: Close a
357: .Tn TELNET
358: session and return to command mode.
1.40 sobrado 359: .It Ic display Ar argument ...
1.1 deraadt 360: Displays all, or some, of the
361: .Ic set
362: and
363: .Ic toggle
364: values (see below).
1.40 sobrado 365: .It Ic encrypt Ar argument ...
1.12 aaron 366: The
367: .Ic encrypt
368: command manipulates the information sent through the
1.1 deraadt 369: .Dv TELNET ENCRYPT
1.28 hin 370: option that's available when Kerberos is used.
1.14 aaron 371: .Pp
1.1 deraadt 372: Valid arguments for the encrypt command are as follows:
373: .Bl -tag -width Ar
374: .It Ic disable Ar type Ic [input|output]
1.12 aaron 375: Disables the specified
376: .Ar type
1.22 aaron 377: of encryption.
378: If you omit
1.12 aaron 379: .Ic input
380: and
381: .Ic output ,
382: both input and output
1.22 aaron 383: are disabled.
384: To obtain a list of available types, use the
1.35 jmc 385: .Ic encrypt disable ?\&
1.1 deraadt 386: command.
387: .It Ic enable Ar type Ic [input|output]
1.12 aaron 388: Enables the specified
389: .Ar type
1.22 aaron 390: of encryption.
391: If you omit
1.12 aaron 392: .Ic input
393: and
394: .Ic output ,
395: both input and output are
1.22 aaron 396: enabled.
397: To obtain a list of available types, use the
1.35 jmc 398: .Ic encrypt enable ?\&
1.1 deraadt 399: command.
400: .It Ic input
401: This is the same as the
402: .Ic encrypt start input
403: command.
404: .It Ic -input
405: This is the same as the
406: .Ic encrypt stop input
407: command.
408: .It Ic output
409: This is the same as the
410: .Ic encrypt start output
411: command.
412: .It Ic -output
413: This is the same as the
414: .Ic encrypt stop output
415: command.
416: .It Ic start Ic [input|output]
1.22 aaron 417: Attempts to start encryption.
418: If you omit
1.1 deraadt 419: .Ic input
420: and
1.24 aaron 421: .Ic output ,
1.22 aaron 422: both input and output are enabled.
423: To obtain a list of available types, use the
1.35 jmc 424: .Ic encrypt enable ?\&
1.1 deraadt 425: command.
426: .It Ic status
427: Lists the current status of encryption.
428: .It Ic stop Ic [input|output]
1.22 aaron 429: Stops encryption.
430: If you omit
1.12 aaron 431: .Ic input
432: and
433: .Ic output ,
1.1 deraadt 434: encryption is on both input and output.
435: .It Ic type Ar type
436: Sets the default type of encryption to be used
437: with later
438: .Ic encrypt start
439: or
440: .Ic encrypt stop
441: commands.
442: .El
1.40 sobrado 443: .It Ic environ Ar argument ...
1.1 deraadt 444: The
445: .Ic environ
446: command is used to manipulate the
1.11 deraadt 447: variables that may be sent through the
1.1 deraadt 448: .Dv TELNET ENVIRON
449: option.
450: The initial set of variables is taken from the users
451: environment, with only the
452: .Ev DISPLAY
453: and
454: .Ev PRINTER
455: variables being exported by default.
456: The
457: .Ev USER
458: variable is also exported if the
459: .Fl a
460: or
461: .Fl l
462: options are used.
1.38 jmc 463: .Pp
1.1 deraadt 464: Valid arguments for the
465: .Ic environ
466: command are:
467: .Bl -tag -width Fl
1.16 aaron 468: .It Ic define Ar variable value
1.1 deraadt 469: Define the variable
470: .Ar variable
471: to have a value of
1.12 aaron 472: .Ar value .
1.1 deraadt 473: Any variables defined by this command are automatically exported.
474: The
475: .Ar value
476: may be enclosed in single or double quotes so
477: that tabs and spaces may be included.
1.16 aaron 478: .It Ic undefine Ar variable
1.1 deraadt 479: Remove
480: .Ar variable
481: from the list of environment variables.
1.16 aaron 482: .It Ic export Ar variable
1.1 deraadt 483: Mark the variable
484: .Ar variable
485: to be exported to the remote side.
1.16 aaron 486: .It Ic unexport Ar variable
1.1 deraadt 487: Mark the variable
488: .Ar variable
489: to not be exported unless
490: explicitly asked for by the remote side.
491: .It Ic list
492: List the current set of environment variables.
493: Those marked with a
494: .Cm *
495: will be sent automatically,
496: other variables will only be sent if explicitly requested.
497: .It Ic \&?
498: Prints out help information for the
499: .Ic environ
500: command.
501: .El
502: .It Ic logout
503: Sends the
504: .Dv TELNET LOGOUT
505: option to the remote side.
506: This command is similar to a
507: .Ic close
508: command; however, if the remote side does not support the
509: .Dv LOGOUT
510: option, nothing happens.
511: If, however, the remote side does support the
512: .Dv LOGOUT
513: option, this command should cause the remote side to close the
514: .Tn TELNET
515: connection.
516: If the remote side also supports the concept of
517: suspending a user's session for later reattachment,
518: the logout argument indicates that you
519: should terminate the session immediately.
1.16 aaron 520: .It Ic mode Ar type
1.12 aaron 521: .Ar type
1.1 deraadt 522: is one of several options, depending on the state of the
523: .Tn TELNET
524: session.
525: The remote host is asked for permission to go into the requested mode.
526: If the remote host is capable of entering that mode, the requested
527: mode will be entered.
528: .Bl -tag -width Ar
529: .It Ic character
530: Disable the
531: .Dv TELNET LINEMODE
532: option, or, if the remote side does not understand the
533: .Dv LINEMODE
1.12 aaron 534: option, then enter ``character at a time'' mode.
1.1 deraadt 535: .It Ic line
536: Enable the
537: .Dv TELNET LINEMODE
538: option, or, if the remote side does not understand the
539: .Dv LINEMODE
1.12 aaron 540: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 541: .It Ic isig Pq Ic \-isig
542: Attempt to enable (disable) the
1.1 deraadt 543: .Dv TRAPSIG
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 edit Pq Ic \-edit
551: Attempt to enable (disable) the
1.1 deraadt 552: .Dv EDIT
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 softtabs Pq Ic \-softtabs
560: Attempt to enable (disable) the
1.1 deraadt 561: .Dv SOFT_TAB
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.
1.16 aaron 568: .It Ic litecho Pq Ic \-litecho
569: Attempt to enable (disable) the
1.1 deraadt 570: .Dv LIT_ECHO
1.16 aaron 571: mode of the
1.1 deraadt 572: .Dv LINEMODE
573: option.
1.16 aaron 574: This requires that the
1.1 deraadt 575: .Dv LINEMODE
576: option be enabled.
577: .It Ic \&?
578: Prints out help information for the
579: .Ic mode
580: command.
581: .El
582: .It Xo
583: .Ic open Ar host
1.5 deraadt 584: .Op Fl l Ar user
585: .Oo Op Fl
1.1 deraadt 586: .Ar port Oc
587: .Xc
588: Open a connection to the named host.
589: If no port number
590: is specified,
1.22 aaron 591: .Nm
1.1 deraadt 592: will attempt to contact a
593: .Tn TELNET
594: server at the default port.
595: The host specification may be either a host name (see
1.7 deraadt 596: .Xr hosts 5 )
1.12 aaron 597: or an Internet address specified in the ``dot notation'' (see
1.1 deraadt 598: .Xr inet 3 ) .
599: The
1.5 deraadt 600: .Fl l
1.1 deraadt 601: option may be used to specify the user name
602: to be passed to the remote system via the
603: .Ev ENVIRON
604: option.
605: When connecting to a non-standard port,
1.22 aaron 606: .Nm
1.1 deraadt 607: omits any automatic initiation of
608: .Tn TELNET
1.22 aaron 609: options.
610: When the port number is preceded by a minus sign,
1.1 deraadt 611: the initial option negotiation is done.
612: After establishing a connection, the file
613: .Pa \&.telnetrc
614: in the
1.22 aaron 615: user's home directory is opened.
616: Lines beginning with a ``#'' are
617: comment lines.
618: Blank lines are ignored.
619: Lines that begin
620: without whitespace are the start of a machine entry.
621: The first thing on the line is the name of the machine that is
622: being connected to.
623: The rest of the line, and successive
1.21 aaron 624: lines that begin with whitespace are assumed to be
1.22 aaron 625: .Nm
1.1 deraadt 626: commands and are processed as if they had been typed
627: in manually to the
1.22 aaron 628: .Nm
1.1 deraadt 629: command prompt.
630: .It Ic quit
631: Close any open
632: .Tn TELNET
633: session and exit
1.12 aaron 634: .Nm telnet .
635: An end-of-file (in command mode) will also close a session and exit.
1.40 sobrado 636: .It Ic send Ar argument ...
1.1 deraadt 637: Sends one or more special character sequences to the remote host.
638: The following are the arguments which may be specified
639: (more than one argument may be specified at a time):
640: .Bl -tag -width escape
641: .It Ic abort
642: Sends the
643: .Dv TELNET ABORT
644: (Abort
645: processes)
646: sequence.
647: .It Ic ao
648: Sends the
649: .Dv TELNET AO
650: (Abort Output) sequence, which should cause the remote system to flush
651: all output
652: .Em from
653: the remote system
654: .Em to
655: the user's terminal.
656: .It Ic ayt
657: Sends the
658: .Dv TELNET AYT
659: (Are You There)
660: sequence, to which the remote system may or may not choose to respond.
661: .It Ic brk
662: Sends the
663: .Dv TELNET BRK
664: (Break) sequence, which may have significance to the remote
665: system.
666: .It Ic ec
667: Sends the
668: .Dv TELNET EC
669: (Erase Character)
670: sequence, which should cause the remote system to erase the last character
671: entered.
672: .It Ic el
673: Sends the
674: .Dv TELNET EL
675: (Erase Line)
676: sequence, which should cause the remote system to erase the line currently
677: being entered.
678: .It Ic eof
679: Sends the
680: .Dv TELNET EOF
681: (End Of File)
682: sequence.
683: .It Ic eor
684: Sends the
685: .Dv TELNET EOR
686: (End of Record)
687: sequence.
688: .It Ic escape
689: Sends the current
1.22 aaron 690: .Nm
1.12 aaron 691: escape character (initially ``^]'').
1.1 deraadt 692: .It Ic ga
693: Sends the
694: .Dv TELNET GA
695: (Go Ahead)
696: sequence, which likely has no significance to the remote system.
697: .It Ic getstatus
698: If the remote side supports the
699: .Dv TELNET STATUS
700: command,
701: .Ic getstatus
702: will send the subnegotiation to request that the server send
703: its current option status.
704: .It Ic ip
705: Sends the
706: .Dv TELNET IP
707: (Interrupt Process) sequence, which should cause the remote
708: system to abort the currently running process.
709: .It Ic nop
710: Sends the
711: .Dv TELNET NOP
712: (No OPeration)
713: sequence.
714: .It Ic susp
715: Sends the
716: .Dv TELNET SUSP
717: (SUSPend process)
718: sequence.
719: .It Ic synch
720: Sends the
721: .Dv TELNET SYNCH
722: sequence.
723: This sequence causes the remote system to discard all previously typed
724: (but not yet read) input.
725: This sequence is sent as
726: .Tn TCP
727: urgent
728: data (and may not work if the remote system is a
729: .Bx 4.2
730: system -- if
1.12 aaron 731: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 732: .It Ic do Ar cmd
1.12 aaron 733: Sends the
734: .Dv TELNET DO
735: .Ar cmd
736: sequence.
737: .Ar cmd
738: can be either a decimal number between 0 and 255,
739: or a symbolic name for a specific
740: .Dv TELNET
741: command.
742: .Ar cmd
743: can also be either
744: .Ic help
745: or
1.35 jmc 746: .Ic ?\&
1.12 aaron 747: to print out help information, including
748: a list of known symbolic names.
1.1 deraadt 749: .It Ic dont Ar cmd
1.12 aaron 750: Sends the
751: .Dv TELNET DONT
752: .Ar cmd
753: sequence.
754: .Ar cmd
755: can be either a decimal number between 0 and 255,
756: or a symbolic name for a specific
757: .Dv TELNET
758: command.
759: .Ar cmd
760: can also be either
761: .Ic help
762: or
1.35 jmc 763: .Ic ?\&
1.12 aaron 764: to print out help information, including
765: a list of known symbolic names.
1.1 deraadt 766: .It Ic will Ar cmd
1.12 aaron 767: Sends the
768: .Dv TELNET WILL
769: .Ar cmd
770: sequence.
771: .Ar cmd
772: can be either a decimal number between 0 and 255,
773: or a symbolic name for a specific
774: .Dv TELNET
775: command.
776: .Ar cmd
777: can also be either
778: .Ic help
779: or
1.35 jmc 780: .Ic ?\&
1.12 aaron 781: to print out help information, including
782: a list of known symbolic names.
1.1 deraadt 783: .It Ic wont Ar cmd
784: Sends the
1.12 aaron 785: .Dv TELNET WONT
1.1 deraadt 786: .Ar cmd
787: sequence.
1.12 aaron 788: .Ar cmd
1.1 deraadt 789: can be either a decimal number between 0 and 255,
790: or a symbolic name for a specific
791: .Dv TELNET
792: command.
1.12 aaron 793: .Ar cmd
1.1 deraadt 794: can also be either
795: .Ic help
796: or
1.35 jmc 797: .Ic ?\&
1.1 deraadt 798: to print out help information, including
799: a list of known symbolic names.
800: .It Ic \&?
801: Prints out help information for the
802: .Ic send
803: command.
804: .El
1.16 aaron 805: .It Ic set Ar argument value
806: .It Ic unset Ar argument value
1.1 deraadt 807: The
808: .Ic set
809: command will set any one of a number of
1.22 aaron 810: .Nm
1.1 deraadt 811: variables to a specific value or to
812: .Dv TRUE .
813: The special value
814: .Ic off
815: turns off the function associated with
1.12 aaron 816: the variable; this is equivalent to using the
1.1 deraadt 817: .Ic unset
818: command.
819: The
820: .Ic unset
821: command will disable or set to
822: .Dv FALSE
823: any of the specified functions.
824: The values of variables may be interrogated with the
825: .Ic display
826: command.
827: The variables which may be set or unset, but not toggled, are
1.22 aaron 828: listed here.
829: In addition, any of the variables for the
1.1 deraadt 830: .Ic toggle
831: command may be explicitly set or unset using
832: the
833: .Ic set
834: and
835: .Ic unset
836: commands.
837: .Bl -tag -width escape
838: .It Ic ayt
839: If
840: .Tn TELNET
1.12 aaron 841: is in
842: .Ic localchars
843: mode, or
1.1 deraadt 844: .Dv LINEMODE
845: is enabled, and the status character is typed, a
846: .Dv TELNET AYT
847: sequence (see
848: .Ic send ayt
849: preceding) is sent to the
1.22 aaron 850: remote host.
851: The initial value for the "Are You There"
1.1 deraadt 852: character is the terminal's status character.
853: .It Ic echo
1.12 aaron 854: This is the value (initially ``^E'') which, when in
855: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 856: of entered characters (for normal processing), and suppressing
857: echoing of entered characters (for entering, say, a password).
858: .It Ic eof
859: If
1.22 aaron 860: .Nm
1.1 deraadt 861: is operating in
862: .Dv LINEMODE
1.12 aaron 863: or ``old line by line'' mode, entering this character
1.1 deraadt 864: as the first character on a line will cause this character to be
865: sent to the remote system.
1.12 aaron 866: The initial value of the
867: .Ic eof
868: character is taken to be the terminal's
1.1 deraadt 869: .Ic eof
870: character.
871: .It Ic erase
872: If
1.22 aaron 873: .Nm
1.1 deraadt 874: is in
875: .Ic localchars
876: mode (see
877: .Ic toggle
878: .Ic localchars
879: below),
1.12 aaron 880: and if
1.22 aaron 881: .Nm
1.12 aaron 882: is operating in ``character at a time'' mode, then when this
1.1 deraadt 883: character is typed, a
884: .Dv TELNET EC
885: sequence (see
886: .Ic send
887: .Ic ec
888: above)
889: is sent to the remote system.
1.12 aaron 890: The initial value for the
891: .Ic erase
892: character is taken to be
1.1 deraadt 893: the terminal's
894: .Ic erase
895: character.
896: .It Ic escape
897: This is the
1.22 aaron 898: .Nm
1.12 aaron 899: escape character (initially ``^['') which causes entry
1.1 deraadt 900: into
1.22 aaron 901: .Nm
1.1 deraadt 902: command mode (when connected to a remote system).
903: .It Ic flushoutput
904: If
1.22 aaron 905: .Nm
1.1 deraadt 906: is in
907: .Ic localchars
908: mode (see
909: .Ic toggle
910: .Ic localchars
911: below)
912: and the
913: .Ic flushoutput
914: character is typed, a
915: .Dv TELNET AO
916: sequence (see
917: .Ic send
918: .Ic ao
919: above)
920: is sent to the remote host.
1.12 aaron 921: The initial value for the
922: .Ic flush
923: character is taken to be
1.1 deraadt 924: the terminal's
925: .Ic flush
926: character.
927: .It Ic forw1
928: .It Ic forw2
929: If
930: .Tn TELNET
931: is operating in
932: .Dv LINEMODE ,
933: these are the
934: characters that, when typed, cause partial lines to be
1.22 aaron 935: forwarded to the remote system.
936: The initial value for
1.1 deraadt 937: the forwarding characters are taken from the terminal's
938: eol and eol2 characters.
939: .It Ic interrupt
940: If
1.22 aaron 941: .Nm
1.1 deraadt 942: is in
943: .Ic localchars
944: mode (see
945: .Ic toggle
946: .Ic localchars
947: below)
948: and the
949: .Ic interrupt
950: character is typed, a
951: .Dv TELNET IP
952: sequence (see
953: .Ic send
954: .Ic ip
955: above)
956: is sent to the remote host.
1.12 aaron 957: The initial value for the
958: .Ic interrupt
959: character is taken to be
1.1 deraadt 960: the terminal's
961: .Ic intr
962: character.
963: .It Ic kill
964: If
1.22 aaron 965: .Nm
1.1 deraadt 966: is in
967: .Ic localchars
968: mode (see
969: .Ic toggle
970: .Ic localchars
971: below),
1.12 aaron 972: and if
1.22 aaron 973: .Nm
1.12 aaron 974: is operating in ``character at a time'' mode, then when this
1.1 deraadt 975: character is typed, a
976: .Dv TELNET EL
977: sequence (see
978: .Ic send
979: .Ic el
980: above)
981: is sent to the remote system.
1.12 aaron 982: The initial value for the
983: .Ic kill
984: character is taken to be
1.1 deraadt 985: the terminal's
986: .Ic kill
987: character.
988: .It Ic lnext
989: If
1.22 aaron 990: .Nm
1.1 deraadt 991: is operating in
992: .Dv LINEMODE
1.12 aaron 993: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 994: be the terminal's
995: .Ic lnext
996: character.
1.12 aaron 997: The initial value for the
998: .Ic lnext
999: character is taken to be
1.1 deraadt 1000: the terminal's
1001: .Ic lnext
1002: character.
1003: .It Ic quit
1004: If
1.22 aaron 1005: .Nm
1.1 deraadt 1006: is in
1007: .Ic localchars
1008: mode (see
1009: .Ic toggle
1010: .Ic localchars
1011: below)
1012: and the
1013: .Ic quit
1014: character is typed, a
1015: .Dv TELNET BRK
1016: sequence (see
1017: .Ic send
1018: .Ic brk
1019: above)
1020: is sent to the remote host.
1.12 aaron 1021: The initial value for the
1022: .Ic quit
1023: character is taken to be
1.1 deraadt 1024: the terminal's
1025: .Ic quit
1026: character.
1027: .It Ic reprint
1028: If
1.22 aaron 1029: .Nm
1.1 deraadt 1030: is operating in
1031: .Dv LINEMODE
1.31 deraadt 1032: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1033: be the terminal's
1034: .Ic reprint
1035: character.
1.12 aaron 1036: The initial value for the
1037: .Ic reprint
1038: character is taken to be
1.1 deraadt 1039: the terminal's
1040: .Ic reprint
1041: character.
1042: .It Ic rlogin
1043: This is the rlogin escape character.
1044: If set, the normal
1045: .Tn TELNET
1046: escape character is ignored unless it is
1047: preceded by this character at the beginning of a line.
1.12 aaron 1048: This character, at the beginning of a line, followed by
1049: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1050: suspends the
1.22 aaron 1051: .Nm
1052: command.
1053: The initial state is to
1.12 aaron 1054: disable the
1055: .Ic rlogin
1056: escape character.
1.1 deraadt 1057: .It Ic start
1058: If the
1059: .Dv TELNET TOGGLE-FLOW-CONTROL
1060: option has been enabled,
1061: then this character is taken to
1062: be the terminal's
1063: .Ic start
1064: character.
1.12 aaron 1065: The initial value for the
1066: .Ic start
1067: character is taken to be
1.1 deraadt 1068: the terminal's
1069: .Ic start
1070: character.
1071: .It Ic stop
1072: If the
1073: .Dv TELNET TOGGLE-FLOW-CONTROL
1074: option has been enabled,
1075: then this character is taken to
1076: be the terminal's
1077: .Ic stop
1078: character.
1.12 aaron 1079: The initial value for the
1080: .Ic stop
1081: character is taken to be
1.1 deraadt 1082: the terminal's
1083: .Ic stop
1084: character.
1085: .It Ic susp
1086: If
1.22 aaron 1087: .Nm
1.1 deraadt 1088: is in
1089: .Ic localchars
1090: mode, or
1091: .Dv LINEMODE
1092: is enabled, and the
1093: .Ic suspend
1094: character is typed, a
1095: .Dv TELNET SUSP
1096: sequence (see
1097: .Ic send
1098: .Ic susp
1099: above)
1100: is sent to the remote host.
1.12 aaron 1101: The initial value for the
1102: .Ic suspend
1103: character is taken to be
1.1 deraadt 1104: the terminal's
1105: .Ic suspend
1106: character.
1107: .It Ic tracefile
1108: This is the file to which the output, caused by
1109: .Ic netdata
1110: or
1111: .Ic option
1112: tracing being
1113: .Dv TRUE ,
1.22 aaron 1114: will be written.
1115: If it is set to
1.1 deraadt 1116: .Dq Fl ,
1117: then tracing information will be written to standard output (the default).
1118: .It Ic worderase
1119: If
1.22 aaron 1120: .Nm
1.1 deraadt 1121: is operating in
1122: .Dv LINEMODE
1.12 aaron 1123: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1124: be the terminal's
1125: .Ic worderase
1126: character.
1.12 aaron 1127: The initial value for the
1128: .Ic worderase
1129: character is taken to be
1.1 deraadt 1130: the terminal's
1131: .Ic worderase
1132: character.
1133: .It Ic \&?
1134: Displays the legal
1135: .Ic set
1136: .Pq Ic unset
1137: commands.
1138: .El
1.17 aaron 1139: .It Ic skey Ar sequence challenge
1140: The
1141: .Ic skey
1.23 aaron 1142: command computes a response to the S/Key challenge.
1143: See
1.17 aaron 1144: .Xr skey 1
1145: for more information on the S/Key system.
1.16 aaron 1146: .It Ic slc Ar state
1.1 deraadt 1147: The
1148: .Ic slc
1149: command (Set Local Characters) is used to set
1.4 deraadt 1150: or change the state of the special
1.16 aaron 1151: characters when the
1.1 deraadt 1152: .Dv TELNET LINEMODE
1153: option has
1.22 aaron 1154: been enabled.
1155: Special characters are characters that get mapped to
1.1 deraadt 1156: .Tn TELNET
1157: commands sequences (like
1158: .Ic ip
1159: or
1.22 aaron 1160: .Ic quit )
1.1 deraadt 1161: or line editing characters (like
1162: .Ic erase
1163: and
1.22 aaron 1164: .Ic kill ) .
1.1 deraadt 1165: By default, the local special characters are exported.
1166: .Bl -tag -width Fl
1167: .It Ic check
1168: Verify the current settings for the current special characters.
1169: The remote side is requested to send all the current special
1170: character settings, and if there are any discrepancies with
1171: the local side, the local side will switch to the remote value.
1172: .It Ic export
1.22 aaron 1173: Switch to the local defaults for the special characters.
1174: The local default characters are those of the local terminal at
1.1 deraadt 1175: the time when
1.22 aaron 1176: .Nm
1.1 deraadt 1177: was started.
1178: .It Ic import
1179: Switch to the remote defaults for the special characters.
1180: The remote default characters are those of the remote system
1.16 aaron 1181: at the time when the
1.1 deraadt 1182: .Tn TELNET
1183: connection was established.
1184: .It Ic \&?
1185: Prints out help information for the
1186: .Ic slc
1187: command.
1188: .El
1189: .It Ic status
1190: Show the current status of
1.12 aaron 1191: .Nm telnet .
1.1 deraadt 1192: This includes the peer one is connected to, as well
1193: as the current mode.
1.40 sobrado 1194: .It Ic toggle Ar argument ...
1.1 deraadt 1195: Toggle (between
1196: .Dv TRUE
1197: and
1198: .Dv FALSE )
1199: various flags that control how
1.22 aaron 1200: .Nm
1.1 deraadt 1201: responds to events.
1202: These flags may be set explicitly to
1203: .Dv TRUE
1204: or
1205: .Dv FALSE
1206: using the
1207: .Ic set
1208: and
1209: .Ic unset
1210: commands listed above.
1211: More than one argument may be specified.
1212: The state of these flags may be interrogated with the
1213: .Ic display
1214: command.
1215: Valid arguments are:
1216: .Bl -tag -width Ar
1217: .It Ic authdebug
1218: Turns on debugging information for the authentication code.
1219: .It Ic autoflush
1220: If
1221: .Ic autoflush
1222: and
1223: .Ic localchars
1224: are both
1225: .Dv TRUE ,
1226: then when the
1.12 aaron 1227: .Ic ao
1.1 deraadt 1228: or
1229: .Ic quit
1230: characters are recognized (and transformed into
1231: .Tn TELNET
1232: sequences; see
1233: .Ic set
1234: above for details),
1.22 aaron 1235: .Nm
1.1 deraadt 1236: refuses to display any data on the user's terminal
1237: until the remote system acknowledges (via a
1238: .Dv TELNET TIMING MARK
1239: option)
1240: that it has processed those
1241: .Tn TELNET
1242: sequences.
1243: The initial value for this toggle is
1244: .Dv TRUE
1245: if the terminal user had not
1246: done an "stty noflsh", otherwise
1247: .Dv FALSE
1248: (see
1.22 aaron 1249: .Xr stty 1 ) .
1.1 deraadt 1250: .It Ic autodecrypt
1251: When the
1252: .Dv TELNET ENCRYPT
1253: option is negotiated, by
1254: default the actual encryption (decryption) of the data
1.22 aaron 1255: stream does not start automatically.
1256: The
1.12 aaron 1257: .Ic autoencrypt
1258: .Pq Ic autodecrypt
1259: command states that encryption of the
1.1 deraadt 1260: output (input) stream should be enabled as soon as
1261: possible.
1262: .Pp
1263: .It Ic autologin
1264: If the remote side supports the
1265: .Dv TELNET AUTHENTICATION
1266: option
1267: .Tn TELNET
1.22 aaron 1268: attempts to use it to perform automatic authentication.
1269: If the
1.1 deraadt 1270: .Dv AUTHENTICATION
1271: option is not supported, the user's login
1.31 deraadt 1272: name is propagated through the
1.1 deraadt 1273: .Dv TELNET ENVIRON
1274: option.
1275: This command is the same as specifying
1276: .Ar a
1277: option on the
1278: .Ic open
1279: command.
1280: .It Ic autosynch
1281: If
1282: .Ic autosynch
1283: and
1284: .Ic localchars
1285: are both
1286: .Dv TRUE ,
1287: then when either the
1288: .Ic intr
1289: or
1290: .Ic quit
1.12 aaron 1291: character is typed (see
1.1 deraadt 1292: .Ic set
1293: above for descriptions of the
1294: .Ic intr
1295: and
1296: .Ic quit
1297: characters), the resulting
1298: .Tn TELNET
1299: sequence sent is followed by the
1300: .Dv TELNET SYNCH
1301: sequence.
1302: This procedure
1.12 aaron 1303: .Em should
1.1 deraadt 1304: cause the remote system to begin throwing away all previously
1305: typed input until both of the
1306: .Tn TELNET
1307: sequences have been read and acted upon.
1308: The initial value of this toggle is
1309: .Dv FALSE .
1310: .It Ic binary
1311: Enable or disable the
1312: .Dv TELNET BINARY
1313: option on both input and output.
1314: .It Ic inbinary
1315: Enable or disable the
1316: .Dv TELNET BINARY
1317: option on input.
1318: .It Ic outbinary
1319: Enable or disable the
1320: .Dv TELNET BINARY
1321: option on output.
1322: .It Ic crlf
1323: If this is
1324: .Dv TRUE ,
1325: then carriage returns will be sent as
1326: .Li <CR><LF> .
1327: If this is
1328: .Dv FALSE ,
1.31 deraadt 1329: then carriage returns will be sent as
1.1 deraadt 1330: .Li <CR><NUL> .
1331: The initial value for this toggle is
1332: .Dv FALSE .
1333: .It Ic crmod
1334: Toggle carriage return mode.
1335: When this mode is enabled, most carriage return characters received from
1336: the remote host will be mapped into a carriage return followed by
1337: a line feed.
1338: This mode does not affect those characters typed by the user, only
1339: those received from the remote host.
1340: This mode is not very useful unless the remote host
1.12 aaron 1341: only sends carriage return, but never line feeds.
1.1 deraadt 1342: The initial value for this toggle is
1343: .Dv FALSE .
1344: .It Ic debug
1.25 aaron 1345: Toggles socket level debugging (useful only to the superuser).
1.1 deraadt 1346: The initial value for this toggle is
1347: .Dv FALSE .
1348: .It Ic encdebug
1349: Turns on debugging information for the encryption code.
1350: .It Ic localchars
1351: If this is
1352: .Dv TRUE ,
1353: then the
1.12 aaron 1354: .Ic flush ,
1.1 deraadt 1355: .Ic interrupt ,
1.12 aaron 1356: .Ic quit ,
1.1 deraadt 1357: .Ic erase ,
1358: and
1359: .Ic kill
1360: characters (see
1361: .Ic set
1362: above) are recognized locally, and transformed into (hopefully) appropriate
1363: .Tn TELNET
1364: control sequences
1365: (respectively
1.12 aaron 1366: .Ic ao ,
1.1 deraadt 1367: .Ic ip ,
1.12 aaron 1368: .Ic brk ,
1.1 deraadt 1369: .Ic ec ,
1370: and
1.22 aaron 1371: .Ic el ;
1.1 deraadt 1372: see
1373: .Ic send
1374: above).
1375: The initial value for this toggle is
1376: .Dv TRUE
1.12 aaron 1377: in ``old line by line'' mode,
1.1 deraadt 1378: and
1379: .Dv FALSE
1.12 aaron 1380: in ``character at a time'' mode.
1.1 deraadt 1381: When the
1382: .Dv LINEMODE
1383: option is enabled, the value of
1384: .Ic localchars
1385: is ignored, and assumed to always be
1386: .Dv TRUE .
1387: If
1388: .Dv LINEMODE
1389: has ever been enabled, then
1390: .Ic quit
1391: is sent as
1.12 aaron 1392: .Ic abort ,
1393: and
1394: .Ic eof
1.1 deraadt 1395: and
1.5 deraadt 1396: .Ic suspend
1.1 deraadt 1397: are sent as
1.12 aaron 1398: .Ic eof
1399: and
1.5 deraadt 1400: .Ic susp
1401: (see
1.1 deraadt 1402: .Ic send
1403: above).
1404: .It Ic netdata
1405: Toggles the display of all network data (in hexadecimal format).
1406: The initial value for this toggle is
1407: .Dv FALSE .
1408: .It Ic options
1409: Toggles the display of some internal
1.22 aaron 1410: .Nm
1.1 deraadt 1411: protocol processing (having to do with
1412: .Tn TELNET
1413: options).
1414: The initial value for this toggle is
1415: .Dv FALSE .
1416: .It Ic prettydump
1417: When the
1418: .Ic netdata
1419: toggle is enabled, if
1420: .Ic prettydump
1421: is enabled the output from the
1422: .Ic netdata
1423: command will be formatted in a more user readable format.
1424: Spaces are put between each character in the output, and the
1425: beginning of any
1426: .Tn TELNET
1427: escape sequence is preceded by a '*' to aid in locating them.
1428: .It Ic skiprc
1429: When the skiprc toggle is
1430: .Dv TRUE ,
1431: .Tn TELNET
1432: skips the reading of the
1433: .Pa \&.telnetrc
1.12 aaron 1434: file in the user's home
1.22 aaron 1435: directory when connections are opened.
1436: The initial value for this toggle is
1.13 aaron 1437: .Dv FALSE .
1.1 deraadt 1438: .It Ic termdata
1439: Toggles the display of all terminal data (in hexadecimal format).
1440: The initial value for this toggle is
1441: .Dv FALSE .
1442: .It Ic verbose_encrypt
1443: When the
1444: .Ic verbose_encrypt
1445: toggle is
1446: .Dv TRUE ,
1.22 aaron 1447: .Nm
1.1 deraadt 1448: prints out a message each time encryption is enabled or
1.22 aaron 1449: disabled.
1450: The initial value for this toggle is
1.13 aaron 1451: .Dv FALSE .
1.1 deraadt 1452: .It Ic \&?
1453: Displays the legal
1454: .Ic toggle
1455: commands.
1456: .El
1457: .It Ic z
1458: Suspend
1.12 aaron 1459: .Nm telnet .
1.1 deraadt 1460: This command only works when the user is using the
1.12 aaron 1461: .Xr csh 1 .
1.16 aaron 1462: .It Ic \&! Op Ar command
1.1 deraadt 1463: Execute a single command in a subshell on the local
1.22 aaron 1464: system.
1465: If
1.5 deraadt 1466: .Ar command
1.1 deraadt 1467: is omitted, then an interactive
1468: subshell is invoked.
1.16 aaron 1469: .It Ic \&? Op Ar command
1.22 aaron 1470: Get help.
1471: With no arguments,
1472: .Nm
1.1 deraadt 1473: prints a help summary.
1474: If a command is specified,
1.22 aaron 1475: .Nm
1.1 deraadt 1476: will print the help information for just that command.
1477: .El
1478: .Sh ENVIRONMENT
1.22 aaron 1479: .Nm
1.1 deraadt 1480: uses at least the
1481: .Ev HOME ,
1482: .Ev SHELL ,
1483: .Ev DISPLAY ,
1484: and
1485: .Ev TERM
1486: environment variables.
1487: Other environment variables may be propagated
1488: to the other side via the
1489: .Dv TELNET ENVIRON
1490: option.
1491: .Sh FILES
1492: .Bl -tag -width ~/.telnetrc -compact
1493: .It Pa ~/.telnetrc
1494: user customized telnet startup values
1495: .El
1496: .Sh HISTORY
1497: The
1.22 aaron 1498: .Nm
1.1 deraadt 1499: command appeared in
1500: .Bx 4.2 .
1501: .Sh NOTES
1502: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1503: ``old line by line'' mode.
1.1 deraadt 1504: .Pp
1.16 aaron 1505: In ``old line by line'' mode or
1.1 deraadt 1506: .Dv LINEMODE
1507: the terminal's
1508: .Ic eof
1509: character is only recognized (and sent to the remote system)
1510: when it is the first character on a line.
1.20 itojun 1511: .Pp
1512: Source routing is not supported yet for IPv6.
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