Annotation of src/usr.bin/telnet/telnet.1, Revision 1.45
1.45 ! jmc 1: .\" $OpenBSD: telnet.1,v 1.44 2012/03/01 04:51:16 lum Exp $
1.2 niklas 2: .\" $NetBSD: telnet.1,v 1.5 1996/02/28 21:04:12 thorpej Exp $
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1.45 ! jmc 33: .Dd $Mdocdate: March 1 2012 $
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
1.43 guenther 50: .Op Fl V Ar rtable
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.
1.43 guenther 189: .It Fl V Ar rtable
190: Set the routing table to be used.
1.42 jmc 191: The default is 0.
1.38 jmc 192: .It Fl X Ar authtype
193: Disables the
194: .Ar authtype
195: type of authentication.
1.1 deraadt 196: .It Fl x
1.33 jmc 197: Turn on encryption of the data stream.
198: When this option is turned on,
1.29 hin 199: .Nm
200: will exit with an error if authentication cannot be negotiated or if
201: encryption cannot be turned on.
1.1 deraadt 202: .It Ar host
203: Indicates the official name, an alias, or the Internet address
204: of a remote host.
205: .It Ar port
1.22 aaron 206: Indicates a port number (address of an application).
207: If a number is not specified, the default
208: .Nm
1.1 deraadt 209: port is used.
210: .El
211: .Pp
1.36 jmc 212: When in rlogin mode, a line of the form ~.\&
1.22 aaron 213: disconnects from the
1.1 deraadt 214: remote host; ~ is the telnet escape character.
215: Similarly, the line ~^Z suspends the telnet session.
216: The line ~^] escapes to the normal telnet escape prompt.
217: .Pp
218: Once a connection has been opened,
1.22 aaron 219: .Nm
1.1 deraadt 220: will attempt to enable the
221: .Dv TELNET LINEMODE
222: option.
1.12 aaron 223: If this fails,
1.22 aaron 224: .Nm
1.1 deraadt 225: will revert to one of two input modes:
1.12 aaron 226: either ``character at a time''
227: or ``old line by line''
1.1 deraadt 228: depending on what the remote system supports.
229: .Pp
1.16 aaron 230: When
1.1 deraadt 231: .Dv LINEMODE
232: is enabled, character processing is done on the
1.22 aaron 233: local system, under the control of the remote system.
234: When input
1.1 deraadt 235: editing or character echoing is to be disabled, the remote system
1.22 aaron 236: will relay that information.
237: The remote system will also relay
1.1 deraadt 238: changes to any special characters that happen on the remote
239: system, so that they can take effect on the local system.
240: .Pp
1.12 aaron 241: In ``character at a time'' mode, most
1.1 deraadt 242: text typed is immediately sent to the remote host for processing.
243: .Pp
1.12 aaron 244: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 245: and (normally) only completed lines are sent to the remote host.
1.12 aaron 246: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 247: to turn off and on the local echo
248: (this would mostly be used to enter passwords
249: without the password being echoed).
250: .Pp
1.16 aaron 251: If the
1.1 deraadt 252: .Dv LINEMODE
253: option is enabled, or if the
254: .Ic localchars
255: toggle is
256: .Dv TRUE
1.12 aaron 257: (the default for ``old line by line''; see below),
1.1 deraadt 258: the user's
1.12 aaron 259: .Ic quit ,
1.1 deraadt 260: .Ic intr ,
261: and
262: .Ic flush
263: characters are trapped locally, and sent as
264: .Tn TELNET
265: protocol sequences to the remote side.
1.16 aaron 266: If
1.1 deraadt 267: .Dv LINEMODE
268: has ever been enabled, then the user's
269: .Ic susp
270: and
271: .Ic eof
272: are also sent as
273: .Tn TELNET
274: protocol sequences,
275: and
276: .Ic quit
1.16 aaron 277: is sent as a
1.1 deraadt 278: .Dv TELNET ABORT
1.16 aaron 279: instead of
1.8 deraadt 280: .Dv BREAK .
1.1 deraadt 281: There are options (see
282: .Ic toggle
283: .Ic autoflush
284: and
285: .Ic toggle
286: .Ic autosynch
287: below)
288: which cause this action to flush subsequent output to the terminal
289: (until the remote host acknowledges the
290: .Tn TELNET
291: sequence) and flush previous terminal input
292: (in the case of
293: .Ic quit
294: and
1.22 aaron 295: .Ic intr ) .
1.1 deraadt 296: .Pp
297: While connected to a remote host,
1.22 aaron 298: .Nm
1.1 deraadt 299: command mode may be entered by typing the
1.22 aaron 300: .Nm
1.12 aaron 301: ``escape character'' (initially ``^]'').
1.1 deraadt 302: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 303: Note that the escape character will return to the command mode of the initial
1.18 alex 304: invocation of
1.22 aaron 305: .Nm
1.23 aaron 306: that has the controlling terminal.
307: Use the
1.15 aaron 308: .Cm send escape
309: command to switch to command mode in subsequent
1.22 aaron 310: .Nm
1.15 aaron 311: processes on remote hosts.
1.1 deraadt 312: .Pp
313: The following
1.22 aaron 314: .Nm
1.1 deraadt 315: commands are available.
316: Only enough of each command to uniquely identify it need be typed
317: (this is also true for arguments to the
1.12 aaron 318: .Ic mode ,
1.1 deraadt 319: .Ic set ,
1.12 aaron 320: .Ic toggle ,
1.1 deraadt 321: .Ic unset ,
1.12 aaron 322: .Ic slc ,
1.1 deraadt 323: .Ic environ ,
324: and
325: .Ic display
326: commands).
327: .Bl -tag -width "mode type"
1.40 sobrado 328: .It Ic auth Ar argument ...
1.12 aaron 329: The
330: .Ic auth
331: command manipulates the information sent through the
1.1 deraadt 332: .Dv TELNET AUTHENTICATE
1.22 aaron 333: option.
334: Valid arguments for the
335: .Ic auth
336: command are as follows:
1.1 deraadt 337: .Bl -tag -width "disable type"
338: .It Ic disable Ar type
1.12 aaron 339: Disables the specified
340: .Ar type
1.22 aaron 341: of authentication.
342: To obtain a list of available types, use the
1.35 jmc 343: .Ic auth disable ?\&
1.1 deraadt 344: command.
345: .It Ic enable Ar type
1.12 aaron 346: Enables the specified
347: .Ar type
1.22 aaron 348: of authentication.
349: To obtain a list of available types, use the
1.35 jmc 350: .Ic auth enable ?\&
1.1 deraadt 351: command.
352: .It Ic status
353: Lists the current status of the various types of
354: authentication.
355: .El
356: .It Ic close
357: Close a
358: .Tn TELNET
359: session and return to command mode.
1.40 sobrado 360: .It Ic display Ar argument ...
1.1 deraadt 361: Displays all, or some, of the
362: .Ic set
363: and
364: .Ic toggle
365: values (see below).
1.40 sobrado 366: .It Ic encrypt Ar argument ...
1.12 aaron 367: The
368: .Ic encrypt
369: command manipulates the information sent through the
1.1 deraadt 370: .Dv TELNET ENCRYPT
1.28 hin 371: option that's available when Kerberos is used.
1.14 aaron 372: .Pp
1.1 deraadt 373: Valid arguments for the encrypt command are as follows:
374: .Bl -tag -width Ar
375: .It Ic disable Ar type Ic [input|output]
1.12 aaron 376: Disables the specified
377: .Ar type
1.22 aaron 378: of encryption.
379: If you omit
1.12 aaron 380: .Ic input
381: and
382: .Ic output ,
383: both input and output
1.22 aaron 384: are disabled.
385: To obtain a list of available types, use the
1.35 jmc 386: .Ic encrypt disable ?\&
1.1 deraadt 387: command.
388: .It Ic enable Ar type Ic [input|output]
1.12 aaron 389: Enables the specified
390: .Ar type
1.22 aaron 391: of encryption.
392: If you omit
1.12 aaron 393: .Ic input
394: and
395: .Ic output ,
396: both input and output are
1.22 aaron 397: enabled.
398: To obtain a list of available types, use the
1.35 jmc 399: .Ic encrypt enable ?\&
1.1 deraadt 400: command.
401: .It Ic input
402: This is the same as the
403: .Ic encrypt start input
404: command.
405: .It Ic -input
406: This is the same as the
407: .Ic encrypt stop input
408: command.
409: .It Ic output
410: This is the same as the
411: .Ic encrypt start output
412: command.
413: .It Ic -output
414: This is the same as the
415: .Ic encrypt stop output
416: command.
417: .It Ic start Ic [input|output]
1.22 aaron 418: Attempts to start encryption.
419: If you omit
1.1 deraadt 420: .Ic input
421: and
1.24 aaron 422: .Ic output ,
1.22 aaron 423: both input and output are enabled.
424: To obtain a list of available types, use the
1.35 jmc 425: .Ic encrypt enable ?\&
1.1 deraadt 426: command.
427: .It Ic status
428: Lists the current status of encryption.
429: .It Ic stop Ic [input|output]
1.22 aaron 430: Stops encryption.
431: If you omit
1.12 aaron 432: .Ic input
433: and
434: .Ic output ,
1.1 deraadt 435: encryption is on both input and output.
436: .It Ic type Ar type
437: Sets the default type of encryption to be used
438: with later
439: .Ic encrypt start
440: or
441: .Ic encrypt stop
442: commands.
443: .El
1.40 sobrado 444: .It Ic environ Ar argument ...
1.1 deraadt 445: The
446: .Ic environ
447: command is used to manipulate the
1.11 deraadt 448: variables that may be sent through the
1.1 deraadt 449: .Dv TELNET ENVIRON
450: option.
451: The initial set of variables is taken from the users
452: environment, with only the
453: .Ev DISPLAY
454: and
455: .Ev PRINTER
456: variables being exported by default.
457: The
458: .Ev USER
459: variable is also exported if the
460: .Fl a
461: or
462: .Fl l
463: options are used.
1.38 jmc 464: .Pp
1.1 deraadt 465: Valid arguments for the
466: .Ic environ
467: command are:
468: .Bl -tag -width Fl
1.16 aaron 469: .It Ic define Ar variable value
1.1 deraadt 470: Define the variable
471: .Ar variable
472: to have a value of
1.12 aaron 473: .Ar value .
1.1 deraadt 474: Any variables defined by this command are automatically exported.
475: The
476: .Ar value
477: may be enclosed in single or double quotes so
478: that tabs and spaces may be included.
1.16 aaron 479: .It Ic undefine Ar variable
1.1 deraadt 480: Remove
481: .Ar variable
482: from the list of environment variables.
1.16 aaron 483: .It Ic export Ar variable
1.1 deraadt 484: Mark the variable
485: .Ar variable
486: to be exported to the remote side.
1.16 aaron 487: .It Ic unexport Ar variable
1.1 deraadt 488: Mark the variable
489: .Ar variable
490: to not be exported unless
491: explicitly asked for by the remote side.
492: .It Ic list
493: List the current set of environment variables.
494: Those marked with a
495: .Cm *
496: will be sent automatically,
497: other variables will only be sent if explicitly requested.
498: .It Ic \&?
499: Prints out help information for the
500: .Ic environ
501: command.
502: .El
503: .It Ic logout
504: Sends the
505: .Dv TELNET LOGOUT
506: option to the remote side.
507: This command is similar to a
508: .Ic close
509: command; however, if the remote side does not support the
510: .Dv LOGOUT
511: option, nothing happens.
512: If, however, the remote side does support the
513: .Dv LOGOUT
514: option, this command should cause the remote side to close the
515: .Tn TELNET
516: connection.
517: If the remote side also supports the concept of
518: suspending a user's session for later reattachment,
519: the logout argument indicates that you
520: should terminate the session immediately.
1.16 aaron 521: .It Ic mode Ar type
1.12 aaron 522: .Ar type
1.1 deraadt 523: is one of several options, depending on the state of the
524: .Tn TELNET
525: session.
526: The remote host is asked for permission to go into the requested mode.
527: If the remote host is capable of entering that mode, the requested
528: mode will be entered.
529: .Bl -tag -width Ar
530: .It Ic character
531: Disable the
532: .Dv TELNET LINEMODE
533: option, or, if the remote side does not understand the
534: .Dv LINEMODE
1.12 aaron 535: option, then enter ``character at a time'' mode.
1.1 deraadt 536: .It Ic line
537: Enable the
538: .Dv TELNET LINEMODE
539: option, or, if the remote side does not understand the
540: .Dv LINEMODE
1.12 aaron 541: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 542: .It Ic isig Pq Ic \-isig
543: Attempt to enable (disable) the
1.1 deraadt 544: .Dv TRAPSIG
1.16 aaron 545: mode of the
1.1 deraadt 546: .Dv LINEMODE
547: option.
1.16 aaron 548: This requires that the
1.1 deraadt 549: .Dv LINEMODE
550: option be enabled.
1.16 aaron 551: .It Ic edit Pq Ic \-edit
552: Attempt to enable (disable) the
1.1 deraadt 553: .Dv EDIT
1.16 aaron 554: mode of the
1.1 deraadt 555: .Dv LINEMODE
556: option.
1.16 aaron 557: This requires that the
1.1 deraadt 558: .Dv LINEMODE
559: option be enabled.
1.16 aaron 560: .It Ic softtabs Pq Ic \-softtabs
561: Attempt to enable (disable) the
1.1 deraadt 562: .Dv SOFT_TAB
1.16 aaron 563: mode of the
1.1 deraadt 564: .Dv LINEMODE
565: option.
1.16 aaron 566: This requires that the
1.1 deraadt 567: .Dv LINEMODE
568: option be enabled.
1.16 aaron 569: .It Ic litecho Pq Ic \-litecho
570: Attempt to enable (disable) the
1.1 deraadt 571: .Dv LIT_ECHO
1.16 aaron 572: mode of the
1.1 deraadt 573: .Dv LINEMODE
574: option.
1.16 aaron 575: This requires that the
1.1 deraadt 576: .Dv LINEMODE
577: option be enabled.
578: .It Ic \&?
579: Prints out help information for the
580: .Ic mode
581: command.
582: .El
583: .It Xo
584: .Ic open Ar host
1.5 deraadt 585: .Op Fl l Ar user
586: .Oo Op Fl
1.1 deraadt 587: .Ar port Oc
588: .Xc
589: Open a connection to the named host.
590: If no port number
591: is specified,
1.22 aaron 592: .Nm
1.1 deraadt 593: will attempt to contact a
594: .Tn TELNET
595: server at the default port.
596: The host specification may be either a host name (see
1.7 deraadt 597: .Xr hosts 5 )
1.12 aaron 598: or an Internet address specified in the ``dot notation'' (see
1.1 deraadt 599: .Xr inet 3 ) .
600: The
1.5 deraadt 601: .Fl l
1.1 deraadt 602: option may be used to specify the user name
603: to be passed to the remote system via the
604: .Ev ENVIRON
605: option.
606: When connecting to a non-standard port,
1.22 aaron 607: .Nm
1.1 deraadt 608: omits any automatic initiation of
609: .Tn TELNET
1.22 aaron 610: options.
611: When the port number is preceded by a minus sign,
1.1 deraadt 612: the initial option negotiation is done.
613: After establishing a connection, the file
614: .Pa \&.telnetrc
615: in the
1.22 aaron 616: user's home directory is opened.
617: Lines beginning with a ``#'' are
618: comment lines.
619: Blank lines are ignored.
620: Lines that begin
621: without whitespace are the start of a machine entry.
622: The first thing on the line is the name of the machine that is
623: being connected to.
624: The rest of the line, and successive
1.21 aaron 625: lines that begin with whitespace are assumed to be
1.22 aaron 626: .Nm
1.1 deraadt 627: commands and are processed as if they had been typed
628: in manually to the
1.22 aaron 629: .Nm
1.1 deraadt 630: command prompt.
631: .It Ic quit
632: Close any open
633: .Tn TELNET
634: session and exit
1.12 aaron 635: .Nm telnet .
636: An end-of-file (in command mode) will also close a session and exit.
1.40 sobrado 637: .It Ic send Ar argument ...
1.1 deraadt 638: Sends one or more special character sequences to the remote host.
639: The following are the arguments which may be specified
640: (more than one argument may be specified at a time):
641: .Bl -tag -width escape
642: .It Ic abort
643: Sends the
644: .Dv TELNET ABORT
645: (Abort
646: processes)
647: sequence.
648: .It Ic ao
649: Sends the
650: .Dv TELNET AO
651: (Abort Output) sequence, which should cause the remote system to flush
652: all output
653: .Em from
654: the remote system
655: .Em to
656: the user's terminal.
657: .It Ic ayt
658: Sends the
659: .Dv TELNET AYT
660: (Are You There)
661: sequence, to which the remote system may or may not choose to respond.
662: .It Ic brk
663: Sends the
664: .Dv TELNET BRK
665: (Break) sequence, which may have significance to the remote
666: system.
667: .It Ic ec
668: Sends the
669: .Dv TELNET EC
670: (Erase Character)
671: sequence, which should cause the remote system to erase the last character
672: entered.
673: .It Ic el
674: Sends the
675: .Dv TELNET EL
676: (Erase Line)
677: sequence, which should cause the remote system to erase the line currently
678: being entered.
679: .It Ic eof
680: Sends the
681: .Dv TELNET EOF
682: (End Of File)
683: sequence.
684: .It Ic eor
685: Sends the
686: .Dv TELNET EOR
687: (End of Record)
688: sequence.
689: .It Ic escape
690: Sends the current
1.22 aaron 691: .Nm
1.12 aaron 692: escape character (initially ``^]'').
1.1 deraadt 693: .It Ic ga
694: Sends the
695: .Dv TELNET GA
696: (Go Ahead)
697: sequence, which likely has no significance to the remote system.
698: .It Ic getstatus
699: If the remote side supports the
700: .Dv TELNET STATUS
701: command,
702: .Ic getstatus
703: will send the subnegotiation to request that the server send
704: its current option status.
705: .It Ic ip
706: Sends the
707: .Dv TELNET IP
708: (Interrupt Process) sequence, which should cause the remote
709: system to abort the currently running process.
710: .It Ic nop
711: Sends the
712: .Dv TELNET NOP
713: (No OPeration)
714: sequence.
715: .It Ic susp
716: Sends the
717: .Dv TELNET SUSP
718: (SUSPend process)
719: sequence.
720: .It Ic synch
721: Sends the
722: .Dv TELNET SYNCH
723: sequence.
724: This sequence causes the remote system to discard all previously typed
725: (but not yet read) input.
726: This sequence is sent as
727: .Tn TCP
728: urgent
729: data (and may not work if the remote system is a
730: .Bx 4.2
731: system -- if
1.12 aaron 732: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 733: .It Ic do Ar cmd
1.12 aaron 734: Sends the
735: .Dv TELNET DO
736: .Ar cmd
737: sequence.
738: .Ar cmd
739: can be either a decimal number between 0 and 255,
740: or a symbolic name for a specific
741: .Dv TELNET
742: command.
743: .Ar cmd
744: can also be either
745: .Ic help
746: or
1.35 jmc 747: .Ic ?\&
1.12 aaron 748: to print out help information, including
749: a list of known symbolic names.
1.1 deraadt 750: .It Ic dont Ar cmd
1.12 aaron 751: Sends the
752: .Dv TELNET DONT
753: .Ar cmd
754: sequence.
755: .Ar cmd
756: can be either a decimal number between 0 and 255,
757: or a symbolic name for a specific
758: .Dv TELNET
759: command.
760: .Ar cmd
761: can also be either
762: .Ic help
763: or
1.35 jmc 764: .Ic ?\&
1.12 aaron 765: to print out help information, including
766: a list of known symbolic names.
1.1 deraadt 767: .It Ic will Ar cmd
1.12 aaron 768: Sends the
769: .Dv TELNET WILL
770: .Ar cmd
771: sequence.
772: .Ar cmd
773: can be either a decimal number between 0 and 255,
774: or a symbolic name for a specific
775: .Dv TELNET
776: command.
777: .Ar cmd
778: can also be either
779: .Ic help
780: or
1.35 jmc 781: .Ic ?\&
1.12 aaron 782: to print out help information, including
783: a list of known symbolic names.
1.1 deraadt 784: .It Ic wont Ar cmd
785: Sends the
1.12 aaron 786: .Dv TELNET WONT
1.1 deraadt 787: .Ar cmd
788: sequence.
1.12 aaron 789: .Ar cmd
1.1 deraadt 790: can be either a decimal number between 0 and 255,
791: or a symbolic name for a specific
792: .Dv TELNET
793: command.
1.12 aaron 794: .Ar cmd
1.1 deraadt 795: can also be either
796: .Ic help
797: or
1.35 jmc 798: .Ic ?\&
1.1 deraadt 799: to print out help information, including
800: a list of known symbolic names.
801: .It Ic \&?
802: Prints out help information for the
803: .Ic send
804: command.
805: .El
1.16 aaron 806: .It Ic set Ar argument value
807: .It Ic unset Ar argument value
1.1 deraadt 808: The
809: .Ic set
810: command will set any one of a number of
1.22 aaron 811: .Nm
1.1 deraadt 812: variables to a specific value or to
813: .Dv TRUE .
814: The special value
815: .Ic off
816: turns off the function associated with
1.12 aaron 817: the variable; this is equivalent to using the
1.1 deraadt 818: .Ic unset
819: command.
820: The
821: .Ic unset
822: command will disable or set to
823: .Dv FALSE
824: any of the specified functions.
825: The values of variables may be interrogated with the
826: .Ic display
827: command.
828: The variables which may be set or unset, but not toggled, are
1.22 aaron 829: listed here.
830: In addition, any of the variables for the
1.1 deraadt 831: .Ic toggle
832: command may be explicitly set or unset using
833: the
834: .Ic set
835: and
836: .Ic unset
837: commands.
838: .Bl -tag -width escape
839: .It Ic ayt
840: If
841: .Tn TELNET
1.12 aaron 842: is in
843: .Ic localchars
844: mode, or
1.1 deraadt 845: .Dv LINEMODE
846: is enabled, and the status character is typed, a
847: .Dv TELNET AYT
848: sequence (see
849: .Ic send ayt
850: preceding) is sent to the
1.22 aaron 851: remote host.
852: The initial value for the "Are You There"
1.1 deraadt 853: character is the terminal's status character.
854: .It Ic echo
1.12 aaron 855: This is the value (initially ``^E'') which, when in
856: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 857: of entered characters (for normal processing), and suppressing
858: echoing of entered characters (for entering, say, a password).
859: .It Ic eof
860: If
1.22 aaron 861: .Nm
1.1 deraadt 862: is operating in
863: .Dv LINEMODE
1.12 aaron 864: or ``old line by line'' mode, entering this character
1.1 deraadt 865: as the first character on a line will cause this character to be
866: sent to the remote system.
1.12 aaron 867: The initial value of the
868: .Ic eof
869: character is taken to be the terminal's
1.1 deraadt 870: .Ic eof
871: character.
872: .It Ic erase
873: If
1.22 aaron 874: .Nm
1.1 deraadt 875: is in
876: .Ic localchars
877: mode (see
878: .Ic toggle
879: .Ic localchars
880: below),
1.12 aaron 881: and if
1.22 aaron 882: .Nm
1.12 aaron 883: is operating in ``character at a time'' mode, then when this
1.1 deraadt 884: character is typed, a
885: .Dv TELNET EC
886: sequence (see
887: .Ic send
888: .Ic ec
889: above)
890: is sent to the remote system.
1.12 aaron 891: The initial value for the
892: .Ic erase
893: character is taken to be
1.1 deraadt 894: the terminal's
895: .Ic erase
896: character.
897: .It Ic escape
898: This is the
1.22 aaron 899: .Nm
1.12 aaron 900: escape character (initially ``^['') which causes entry
1.1 deraadt 901: into
1.22 aaron 902: .Nm
1.1 deraadt 903: command mode (when connected to a remote system).
904: .It Ic flushoutput
905: If
1.22 aaron 906: .Nm
1.1 deraadt 907: is in
908: .Ic localchars
909: mode (see
910: .Ic toggle
911: .Ic localchars
912: below)
913: and the
914: .Ic flushoutput
915: character is typed, a
916: .Dv TELNET AO
917: sequence (see
918: .Ic send
919: .Ic ao
920: above)
921: is sent to the remote host.
1.12 aaron 922: The initial value for the
923: .Ic flush
924: character is taken to be
1.1 deraadt 925: the terminal's
926: .Ic flush
927: character.
928: .It Ic forw1
929: .It Ic forw2
930: If
931: .Tn TELNET
932: is operating in
933: .Dv LINEMODE ,
934: these are the
935: characters that, when typed, cause partial lines to be
1.22 aaron 936: forwarded to the remote system.
937: The initial value for
1.1 deraadt 938: the forwarding characters are taken from the terminal's
939: eol and eol2 characters.
940: .It Ic interrupt
941: If
1.22 aaron 942: .Nm
1.1 deraadt 943: is in
944: .Ic localchars
945: mode (see
946: .Ic toggle
947: .Ic localchars
948: below)
949: and the
950: .Ic interrupt
951: character is typed, a
952: .Dv TELNET IP
953: sequence (see
954: .Ic send
955: .Ic ip
956: above)
957: is sent to the remote host.
1.12 aaron 958: The initial value for the
959: .Ic interrupt
960: character is taken to be
1.1 deraadt 961: the terminal's
962: .Ic intr
963: character.
964: .It Ic kill
965: If
1.22 aaron 966: .Nm
1.1 deraadt 967: is in
968: .Ic localchars
969: mode (see
970: .Ic toggle
971: .Ic localchars
972: below),
1.12 aaron 973: and if
1.22 aaron 974: .Nm
1.12 aaron 975: is operating in ``character at a time'' mode, then when this
1.1 deraadt 976: character is typed, a
977: .Dv TELNET EL
978: sequence (see
979: .Ic send
980: .Ic el
981: above)
982: is sent to the remote system.
1.12 aaron 983: The initial value for the
984: .Ic kill
985: character is taken to be
1.1 deraadt 986: the terminal's
987: .Ic kill
988: character.
989: .It Ic lnext
990: If
1.22 aaron 991: .Nm
1.1 deraadt 992: is operating in
993: .Dv LINEMODE
1.12 aaron 994: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 995: be the terminal's
996: .Ic lnext
997: character.
1.12 aaron 998: The initial value for the
999: .Ic lnext
1000: character is taken to be
1.1 deraadt 1001: the terminal's
1002: .Ic lnext
1003: character.
1004: .It Ic quit
1005: If
1.22 aaron 1006: .Nm
1.1 deraadt 1007: is in
1008: .Ic localchars
1009: mode (see
1010: .Ic toggle
1011: .Ic localchars
1012: below)
1013: and the
1014: .Ic quit
1015: character is typed, a
1016: .Dv TELNET BRK
1017: sequence (see
1018: .Ic send
1019: .Ic brk
1020: above)
1021: is sent to the remote host.
1.12 aaron 1022: The initial value for the
1023: .Ic quit
1024: character is taken to be
1.1 deraadt 1025: the terminal's
1026: .Ic quit
1027: character.
1028: .It Ic reprint
1029: If
1.22 aaron 1030: .Nm
1.1 deraadt 1031: is operating in
1032: .Dv LINEMODE
1.31 deraadt 1033: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1034: be the terminal's
1035: .Ic reprint
1036: character.
1.12 aaron 1037: The initial value for the
1038: .Ic reprint
1039: character is taken to be
1.1 deraadt 1040: the terminal's
1041: .Ic reprint
1042: character.
1043: .It Ic rlogin
1044: This is the rlogin escape character.
1045: If set, the normal
1046: .Tn TELNET
1047: escape character is ignored unless it is
1048: preceded by this character at the beginning of a line.
1.12 aaron 1049: This character, at the beginning of a line, followed by
1050: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1051: suspends the
1.22 aaron 1052: .Nm
1053: command.
1054: The initial state is to
1.12 aaron 1055: disable the
1056: .Ic rlogin
1057: escape character.
1.1 deraadt 1058: .It Ic start
1059: If the
1060: .Dv TELNET TOGGLE-FLOW-CONTROL
1061: option has been enabled,
1062: then this character is taken to
1063: be the terminal's
1064: .Ic start
1065: character.
1.12 aaron 1066: The initial value for the
1067: .Ic start
1068: character is taken to be
1.1 deraadt 1069: the terminal's
1070: .Ic start
1071: character.
1072: .It Ic stop
1073: If the
1074: .Dv TELNET TOGGLE-FLOW-CONTROL
1075: option has been enabled,
1076: then this character is taken to
1077: be the terminal's
1078: .Ic stop
1079: character.
1.12 aaron 1080: The initial value for the
1081: .Ic stop
1082: character is taken to be
1.1 deraadt 1083: the terminal's
1084: .Ic stop
1085: character.
1086: .It Ic susp
1087: If
1.22 aaron 1088: .Nm
1.1 deraadt 1089: is in
1090: .Ic localchars
1091: mode, or
1092: .Dv LINEMODE
1093: is enabled, and the
1094: .Ic suspend
1095: character is typed, a
1096: .Dv TELNET SUSP
1097: sequence (see
1098: .Ic send
1099: .Ic susp
1100: above)
1101: is sent to the remote host.
1.12 aaron 1102: The initial value for the
1103: .Ic suspend
1104: character is taken to be
1.1 deraadt 1105: the terminal's
1106: .Ic suspend
1107: character.
1108: .It Ic tracefile
1109: This is the file to which the output, caused by
1110: .Ic netdata
1111: or
1112: .Ic option
1113: tracing being
1114: .Dv TRUE ,
1.22 aaron 1115: will be written.
1116: If it is set to
1.1 deraadt 1117: .Dq Fl ,
1118: then tracing information will be written to standard output (the default).
1119: .It Ic worderase
1120: If
1.22 aaron 1121: .Nm
1.1 deraadt 1122: is operating in
1123: .Dv LINEMODE
1.12 aaron 1124: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1125: be the terminal's
1126: .Ic worderase
1127: character.
1.12 aaron 1128: The initial value for the
1129: .Ic worderase
1130: character is taken to be
1.1 deraadt 1131: the terminal's
1132: .Ic worderase
1133: character.
1134: .It Ic \&?
1135: Displays the legal
1136: .Ic set
1137: .Pq Ic unset
1138: commands.
1139: .El
1.17 aaron 1140: .It Ic skey Ar sequence challenge
1141: The
1142: .Ic skey
1.23 aaron 1143: command computes a response to the S/Key challenge.
1144: See
1.17 aaron 1145: .Xr skey 1
1146: for more information on the S/Key system.
1.16 aaron 1147: .It Ic slc Ar state
1.1 deraadt 1148: The
1149: .Ic slc
1150: command (Set Local Characters) is used to set
1.4 deraadt 1151: or change the state of the special
1.16 aaron 1152: characters when the
1.1 deraadt 1153: .Dv TELNET LINEMODE
1154: option has
1.22 aaron 1155: been enabled.
1156: Special characters are characters that get mapped to
1.1 deraadt 1157: .Tn TELNET
1158: commands sequences (like
1159: .Ic ip
1160: or
1.22 aaron 1161: .Ic quit )
1.1 deraadt 1162: or line editing characters (like
1163: .Ic erase
1164: and
1.22 aaron 1165: .Ic kill ) .
1.1 deraadt 1166: By default, the local special characters are exported.
1167: .Bl -tag -width Fl
1168: .It Ic check
1169: Verify the current settings for the current special characters.
1170: The remote side is requested to send all the current special
1171: character settings, and if there are any discrepancies with
1172: the local side, the local side will switch to the remote value.
1173: .It Ic export
1.22 aaron 1174: Switch to the local defaults for the special characters.
1175: The local default characters are those of the local terminal at
1.1 deraadt 1176: the time when
1.22 aaron 1177: .Nm
1.1 deraadt 1178: was started.
1179: .It Ic import
1180: Switch to the remote defaults for the special characters.
1181: The remote default characters are those of the remote system
1.16 aaron 1182: at the time when the
1.1 deraadt 1183: .Tn TELNET
1184: connection was established.
1185: .It Ic \&?
1186: Prints out help information for the
1187: .Ic slc
1188: command.
1189: .El
1190: .It Ic status
1191: Show the current status of
1.12 aaron 1192: .Nm telnet .
1.1 deraadt 1193: This includes the peer one is connected to, as well
1194: as the current mode.
1.40 sobrado 1195: .It Ic toggle Ar argument ...
1.1 deraadt 1196: Toggle (between
1197: .Dv TRUE
1198: and
1199: .Dv FALSE )
1200: various flags that control how
1.22 aaron 1201: .Nm
1.1 deraadt 1202: responds to events.
1203: These flags may be set explicitly to
1204: .Dv TRUE
1205: or
1206: .Dv FALSE
1207: using the
1208: .Ic set
1209: and
1210: .Ic unset
1211: commands listed above.
1212: More than one argument may be specified.
1213: The state of these flags may be interrogated with the
1214: .Ic display
1215: command.
1216: Valid arguments are:
1217: .Bl -tag -width Ar
1218: .It Ic authdebug
1219: Turns on debugging information for the authentication code.
1220: .It Ic autoflush
1221: If
1222: .Ic autoflush
1223: and
1224: .Ic localchars
1225: are both
1226: .Dv TRUE ,
1227: then when the
1.12 aaron 1228: .Ic ao
1.1 deraadt 1229: or
1230: .Ic quit
1231: characters are recognized (and transformed into
1232: .Tn TELNET
1233: sequences; see
1234: .Ic set
1235: above for details),
1.22 aaron 1236: .Nm
1.1 deraadt 1237: refuses to display any data on the user's terminal
1238: until the remote system acknowledges (via a
1239: .Dv TELNET TIMING MARK
1240: option)
1241: that it has processed those
1242: .Tn TELNET
1243: sequences.
1244: The initial value for this toggle is
1245: .Dv TRUE
1246: if the terminal user had not
1247: done an "stty noflsh", otherwise
1248: .Dv FALSE
1249: (see
1.22 aaron 1250: .Xr stty 1 ) .
1.1 deraadt 1251: .It Ic autodecrypt
1252: When the
1253: .Dv TELNET ENCRYPT
1254: option is negotiated, by
1255: default the actual encryption (decryption) of the data
1.22 aaron 1256: stream does not start automatically.
1257: The
1.12 aaron 1258: .Ic autoencrypt
1259: .Pq Ic autodecrypt
1260: command states that encryption of the
1.1 deraadt 1261: output (input) stream should be enabled as soon as
1262: possible.
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
1.44 lum 1496: .Sh SEE ALSO
1497: .Xr ssh 1
1.1 deraadt 1498: .Sh HISTORY
1499: The
1.22 aaron 1500: .Nm
1.1 deraadt 1501: command appeared in
1502: .Bx 4.2 .
1503: .Sh NOTES
1504: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1505: ``old line by line'' mode.
1.1 deraadt 1506: .Pp
1.16 aaron 1507: In ``old line by line'' mode or
1.1 deraadt 1508: .Dv LINEMODE
1509: the terminal's
1510: .Ic eof
1511: character is only recognized (and sent to the remote system)
1512: when it is the first character on a line.
1.20 itojun 1513: .Pp
1514: Source routing is not supported yet for IPv6.
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