Annotation of src/usr.bin/telnet/telnet.1, Revision 1.24
1.24 ! aaron 1: .\" $OpenBSD: telnet.1,v 1.23 2000/03/23 21:39:55 aaron Exp $
1.2 niklas 2: .\" $NetBSD: telnet.1,v 1.5 1996/02/28 21:04:12 thorpej Exp $
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35: .\" from: @(#)telnet.1 8.4 (Berkeley) 2/3/94
36: .\"
37: .Dd February 3, 1994
38: .Dt TELNET 1
1.16 aaron 39: .Os
1.1 deraadt 40: .Sh NAME
41: .Nm telnet
1.16 aaron 42: .Nd user interface to the
1.1 deraadt 43: .Tn TELNET
44: protocol
45: .Sh SYNOPSIS
46: .Nm telnet
47: .Op Fl 8
48: .Op Fl E
49: .Op Fl F
50: .Op Fl K
51: .Op Fl L
52: .Op Fl S Ar tos
53: .Op Fl X Ar authtype
54: .Op Fl a
1.3 niklas 55: .Op Fl b Ar hostalias
1.1 deraadt 56: .Op Fl c
57: .Op Fl d
58: .Op Fl e Ar escapechar
59: .Op Fl f
60: .Op Fl k Ar realm
61: .Op Fl l Ar user
62: .Op Fl n Ar tracefile
63: .Op Fl r
64: .Op Fl x
65: .Oo
66: .Ar host
1.9 deraadt 67: .Op Ar port
1.1 deraadt 68: .Oc
69: .Sh DESCRIPTION
70: The
1.22 aaron 71: .Nm
1.1 deraadt 72: command
1.16 aaron 73: is used to communicate with another host using the
1.1 deraadt 74: .Tn TELNET
75: protocol.
76: If
1.22 aaron 77: .Nm
1.1 deraadt 78: is invoked without the
79: .Ar host
80: argument, it enters command mode,
81: indicated by its prompt
82: .Pq Nm telnet\&> .
83: In this mode, it accepts and executes the commands listed below.
84: If it is invoked with arguments, it performs an
85: .Ic open
86: command with those arguments.
87: .Pp
1.19 aaron 88: The options are as follows:
1.1 deraadt 89: .Bl -tag -width indent
90: .It Fl 8
1.22 aaron 91: Specifies an 8-bit data path.
92: This causes an attempt to negotiate the
1.1 deraadt 93: .Dv TELNET BINARY
94: option on both input and output.
95: .It Fl E
96: Stops any character from being recognized as an escape character.
97: .It Fl F
98: If Kerberos V5 authentication is being used, the
99: .Fl F
100: option allows the local credentials to be forwarded
101: to the remote system, including any credentials that
102: have already been forwarded into the local environment.
103: .It Fl K
104: Specifies no automatic login to the remote system.
105: .It Fl L
1.22 aaron 106: Specifies an 8-bit data path on output.
107: This causes the BINARY option to be negotiated on output.
1.1 deraadt 108: .It Fl S Ar tos
109: Sets the IP type-of-service (TOS) option for the telnet
110: connection to the value
1.12 aaron 111: .Ar tos ,
1.1 deraadt 112: which can be a numeric TOS value
113: or, on systems that support it, a symbolic
1.12 aaron 114: TOS name found in the
115: .Pa /etc/iptos
116: file.
1.16 aaron 117: .It Fl X Ar atype
1.1 deraadt 118: Disables the
119: .Ar atype
120: type of authentication.
121: .It Fl a
122: Attempt automatic login.
123: Currently, this sends the user name via the
124: .Ev USER
125: variable
126: of the
127: .Ev ENVIRON
128: option if supported by the remote system.
129: The name used is that of the current user as returned by
130: .Xr getlogin 2
131: if it agrees with the current user ID,
132: otherwise it is the name associated with the user ID.
1.3 niklas 133: .It Fl b Ar hostalias
134: Uses
135: .Xr bind 2
1.12 aaron 136: on the local socket to bind it to an aliased address (see
1.3 niklas 137: .Xr ifconfig 8
1.12 aaron 138: and the ``alias'' specifier) or to the address of
1.3 niklas 139: another interface than the one naturally chosen by
140: .Xr connect 2 .
1.12 aaron 141: This can be useful when connecting to services which use IP addresses
1.3 niklas 142: for authentication and reconfiguration of the server is undesirable (or
143: impossible).
1.1 deraadt 144: .It Fl c
145: Disables the reading of the user's
146: .Pa \&.telnetrc
1.22 aaron 147: file.
148: (See the
1.1 deraadt 149: .Ic toggle skiprc
150: command on this man page.)
151: .It Fl d
152: Sets the initial value of the
153: .Ic debug
154: toggle to
1.12 aaron 155: .Dv TRUE .
1.16 aaron 156: .It Fl e Ar escapechar
1.1 deraadt 157: Sets the initial
158: .Nm
159: escape character to
1.9 deraadt 160: .Ar escapechar Ns .
1.1 deraadt 161: If
1.8 deraadt 162: .Ar escapechar
1.1 deraadt 163: is omitted, then
164: there will be no escape character.
165: .It Fl f
166: If Kerberos V5 authentication is being used, the
167: .Fl f
168: option allows the local credentials to be forwarded to the remote system.
169: .It Fl k Ar realm
170: If Kerberos authentication is being used, the
171: .Fl k
1.12 aaron 172: option requests that
1.22 aaron 173: .Nm
1.12 aaron 174: obtain tickets for the remote host in
1.8 deraadt 175: realm
176: .Ar realm
177: instead of the remote host's realm, as determined
1.1 deraadt 178: by
179: .Xr krb_realmofhost 3 .
1.16 aaron 180: .It Fl l Ar user
1.1 deraadt 181: When connecting to the remote system, if the remote system
182: understands the
183: .Ev ENVIRON
184: option, then
185: .Ar user
186: will be sent to the remote system as the value for the variable USER.
187: This option implies the
188: .Fl a
189: option.
190: This option may also be used with the
191: .Ic open
192: command.
1.16 aaron 193: .It Fl n Ar tracefile
1.1 deraadt 194: Opens
195: .Ar tracefile
196: for recording trace information.
197: See the
198: .Ic set tracefile
199: command below.
200: .It Fl r
201: Specifies a user interface similar to
202: .Xr rlogin 1 .
203: In this
204: mode, the escape character is set to the tilde (~) character,
1.8 deraadt 205: unless modified by the
206: .Fl e
207: option.
1.1 deraadt 208: .It Fl x
1.10 art 209: Turns on encryption of the data stream if possible.
1.1 deraadt 210: .It Ar host
211: Indicates the official name, an alias, or the Internet address
212: of a remote host.
213: .It Ar port
1.22 aaron 214: Indicates a port number (address of an application).
215: If a number is not specified, the default
216: .Nm
1.1 deraadt 217: port is used.
218: .El
219: .Pp
1.22 aaron 220: When in rlogin mode, a line of the form ~.
221: disconnects from the
1.1 deraadt 222: remote host; ~ is the telnet escape character.
223: Similarly, the line ~^Z suspends the telnet session.
224: The line ~^] escapes to the normal telnet escape prompt.
225: .Pp
226: Once a connection has been opened,
1.22 aaron 227: .Nm
1.1 deraadt 228: will attempt to enable the
229: .Dv TELNET LINEMODE
230: option.
1.12 aaron 231: If this fails,
1.22 aaron 232: .Nm
1.1 deraadt 233: will revert to one of two input modes:
1.12 aaron 234: either ``character at a time''
235: or ``old line by line''
1.1 deraadt 236: depending on what the remote system supports.
237: .Pp
1.16 aaron 238: When
1.1 deraadt 239: .Dv LINEMODE
240: is enabled, character processing is done on the
1.22 aaron 241: local system, under the control of the remote system.
242: When input
1.1 deraadt 243: editing or character echoing is to be disabled, the remote system
1.22 aaron 244: will relay that information.
245: The remote system will also relay
1.1 deraadt 246: changes to any special characters that happen on the remote
247: system, so that they can take effect on the local system.
248: .Pp
1.12 aaron 249: In ``character at a time'' mode, most
1.1 deraadt 250: text typed is immediately sent to the remote host for processing.
251: .Pp
1.12 aaron 252: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 253: and (normally) only completed lines are sent to the remote host.
1.12 aaron 254: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 255: to turn off and on the local echo
256: (this would mostly be used to enter passwords
257: without the password being echoed).
258: .Pp
1.16 aaron 259: If the
1.1 deraadt 260: .Dv LINEMODE
261: option is enabled, or if the
262: .Ic localchars
263: toggle is
264: .Dv TRUE
1.12 aaron 265: (the default for ``old line by line''; see below),
1.1 deraadt 266: the user's
1.12 aaron 267: .Ic quit ,
1.1 deraadt 268: .Ic intr ,
269: and
270: .Ic flush
271: characters are trapped locally, and sent as
272: .Tn TELNET
273: protocol sequences to the remote side.
1.16 aaron 274: If
1.1 deraadt 275: .Dv LINEMODE
276: has ever been enabled, then the user's
277: .Ic susp
278: and
279: .Ic eof
280: are also sent as
281: .Tn TELNET
282: protocol sequences,
283: and
284: .Ic quit
1.16 aaron 285: is sent as a
1.1 deraadt 286: .Dv TELNET ABORT
1.16 aaron 287: instead of
1.8 deraadt 288: .Dv BREAK .
1.1 deraadt 289: There are options (see
290: .Ic toggle
291: .Ic autoflush
292: and
293: .Ic toggle
294: .Ic autosynch
295: below)
296: which cause this action to flush subsequent output to the terminal
297: (until the remote host acknowledges the
298: .Tn TELNET
299: sequence) and flush previous terminal input
300: (in the case of
301: .Ic quit
302: and
1.22 aaron 303: .Ic intr ) .
1.1 deraadt 304: .Pp
305: While connected to a remote host,
1.22 aaron 306: .Nm
1.1 deraadt 307: command mode may be entered by typing the
1.22 aaron 308: .Nm
1.12 aaron 309: ``escape character'' (initially ``^]'').
1.1 deraadt 310: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 311: Note that the escape character will return to the command mode of the initial
1.18 alex 312: invocation of
1.22 aaron 313: .Nm
1.23 aaron 314: that has the controlling terminal.
315: Use the
1.15 aaron 316: .Cm send escape
317: command to switch to command mode in subsequent
1.22 aaron 318: .Nm
1.15 aaron 319: processes on remote hosts.
1.1 deraadt 320: .Pp
321: The following
1.22 aaron 322: .Nm
1.1 deraadt 323: commands are available.
324: Only enough of each command to uniquely identify it need be typed
325: (this is also true for arguments to the
1.12 aaron 326: .Ic mode ,
1.1 deraadt 327: .Ic set ,
1.12 aaron 328: .Ic toggle ,
1.1 deraadt 329: .Ic unset ,
1.12 aaron 330: .Ic slc ,
1.1 deraadt 331: .Ic environ ,
332: and
333: .Ic display
334: commands).
335: .Bl -tag -width "mode type"
1.16 aaron 336: .It Ic auth Ar argument Op Ar ...
1.12 aaron 337: The
338: .Ic auth
339: command manipulates the information sent through the
1.1 deraadt 340: .Dv TELNET AUTHENTICATE
1.22 aaron 341: option.
342: Valid arguments for the
343: .Ic auth
344: command are as follows:
1.1 deraadt 345: .Bl -tag -width "disable type"
346: .It Ic disable Ar type
1.12 aaron 347: Disables the specified
348: .Ar type
1.22 aaron 349: of authentication.
350: To obtain a list of available types, use the
1.1 deraadt 351: .Ic auth disable \&?
352: command.
353: .It Ic enable Ar type
1.12 aaron 354: Enables the specified
355: .Ar type
1.22 aaron 356: of authentication.
357: To obtain a list of available types, use the
1.1 deraadt 358: .Ic auth enable \&?
359: command.
360: .It Ic status
361: Lists the current status of the various types of
362: authentication.
363: .El
364: .It Ic close
365: Close a
366: .Tn TELNET
367: session and return to command mode.
1.16 aaron 368: .It Ic display Ar argument Op Ar ...
1.1 deraadt 369: Displays all, or some, of the
370: .Ic set
371: and
372: .Ic toggle
373: values (see below).
1.12 aaron 374: .It Ic encrypt Ar argument Op Ar ...
375: The
376: .Ic encrypt
377: command manipulates the information sent through the
1.1 deraadt 378: .Dv TELNET ENCRYPT
379: option.
1.14 aaron 380: .Pp
1.1 deraadt 381: Valid arguments for the encrypt command are as follows:
382: .Bl -tag -width Ar
383: .It Ic disable Ar type Ic [input|output]
1.12 aaron 384: Disables the specified
385: .Ar type
1.22 aaron 386: of encryption.
387: If you omit
1.12 aaron 388: .Ic input
389: and
390: .Ic output ,
391: both input and output
1.22 aaron 392: are disabled.
393: To obtain a list of available types, use the
1.1 deraadt 394: .Ic encrypt disable \&?
395: command.
396: .It Ic enable Ar type Ic [input|output]
1.12 aaron 397: Enables the specified
398: .Ar type
1.22 aaron 399: of encryption.
400: If you omit
1.12 aaron 401: .Ic input
402: and
403: .Ic output ,
404: both input and output are
1.22 aaron 405: enabled.
406: To obtain a list of available types, use the
1.1 deraadt 407: .Ic encrypt enable \&?
408: command.
409: .It Ic input
410: This is the same as the
411: .Ic encrypt start input
412: command.
413: .It Ic -input
414: This is the same as the
415: .Ic encrypt stop input
416: command.
417: .It Ic output
418: This is the same as the
419: .Ic encrypt start output
420: command.
421: .It Ic -output
422: This is the same as the
423: .Ic encrypt stop output
424: command.
425: .It Ic start Ic [input|output]
1.22 aaron 426: Attempts to start encryption.
427: If you omit
1.1 deraadt 428: .Ic input
429: and
1.24 ! aaron 430: .Ic output ,
1.22 aaron 431: both input and output are enabled.
432: To obtain a list of available types, use the
1.1 deraadt 433: .Ic encrypt enable \&?
434: command.
435: .It Ic status
436: Lists the current status of encryption.
437: .It Ic stop Ic [input|output]
1.22 aaron 438: Stops encryption.
439: If you omit
1.12 aaron 440: .Ic input
441: and
442: .Ic output ,
1.1 deraadt 443: encryption is on both input and output.
444: .It Ic type Ar type
445: Sets the default type of encryption to be used
446: with later
447: .Ic encrypt start
448: or
449: .Ic encrypt stop
450: commands.
451: .El
1.16 aaron 452: .It Ic environ Ar arguments Op Ar ...
1.1 deraadt 453: The
454: .Ic environ
455: command is used to manipulate the
1.11 deraadt 456: variables that may be sent through the
1.1 deraadt 457: .Dv TELNET ENVIRON
458: option.
459: The initial set of variables is taken from the users
460: environment, with only the
461: .Ev DISPLAY
462: and
463: .Ev PRINTER
464: variables being exported by default.
465: The
466: .Ev USER
467: variable is also exported if the
468: .Fl a
469: or
470: .Fl l
471: options are used.
472: .br
473: Valid arguments for the
474: .Ic environ
475: command are:
476: .Bl -tag -width Fl
1.16 aaron 477: .It Ic define Ar variable value
1.1 deraadt 478: Define the variable
479: .Ar variable
480: to have a value of
1.12 aaron 481: .Ar value .
1.1 deraadt 482: Any variables defined by this command are automatically exported.
483: The
484: .Ar value
485: may be enclosed in single or double quotes so
486: that tabs and spaces may be included.
1.16 aaron 487: .It Ic undefine Ar variable
1.1 deraadt 488: Remove
489: .Ar variable
490: from the list of environment variables.
1.16 aaron 491: .It Ic export Ar variable
1.1 deraadt 492: Mark the variable
493: .Ar variable
494: to be exported to the remote side.
1.16 aaron 495: .It Ic unexport Ar variable
1.1 deraadt 496: Mark the variable
497: .Ar variable
498: to not be exported unless
499: explicitly asked for by the remote side.
500: .It Ic list
501: List the current set of environment variables.
502: Those marked with a
503: .Cm *
504: will be sent automatically,
505: other variables will only be sent if explicitly requested.
506: .It Ic \&?
507: Prints out help information for the
508: .Ic environ
509: command.
510: .El
511: .It Ic logout
512: Sends the
513: .Dv TELNET LOGOUT
514: option to the remote side.
515: This command is similar to a
516: .Ic close
517: command; however, if the remote side does not support the
518: .Dv LOGOUT
519: option, nothing happens.
520: If, however, the remote side does support the
521: .Dv LOGOUT
522: option, this command should cause the remote side to close the
523: .Tn TELNET
524: connection.
525: If the remote side also supports the concept of
526: suspending a user's session for later reattachment,
527: the logout argument indicates that you
528: should terminate the session immediately.
1.16 aaron 529: .It Ic mode Ar type
1.12 aaron 530: .Ar type
1.1 deraadt 531: is one of several options, depending on the state of the
532: .Tn TELNET
533: session.
534: The remote host is asked for permission to go into the requested mode.
535: If the remote host is capable of entering that mode, the requested
536: mode will be entered.
537: .Bl -tag -width Ar
538: .It Ic character
539: Disable the
540: .Dv TELNET LINEMODE
541: option, or, if the remote side does not understand the
542: .Dv LINEMODE
1.12 aaron 543: option, then enter ``character at a time'' mode.
1.1 deraadt 544: .It Ic line
545: Enable the
546: .Dv TELNET LINEMODE
547: option, or, if the remote side does not understand the
548: .Dv LINEMODE
1.12 aaron 549: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 550: .It Ic isig Pq Ic \-isig
551: Attempt to enable (disable) the
1.1 deraadt 552: .Dv TRAPSIG
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 edit Pq Ic \-edit
560: Attempt to enable (disable) the
1.1 deraadt 561: .Dv EDIT
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 softtabs Pq Ic \-softtabs
569: Attempt to enable (disable) the
1.1 deraadt 570: .Dv SOFT_TAB
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.
1.16 aaron 577: .It Ic litecho Pq Ic \-litecho
578: Attempt to enable (disable) the
1.1 deraadt 579: .Dv LIT_ECHO
1.16 aaron 580: mode of the
1.1 deraadt 581: .Dv LINEMODE
582: option.
1.16 aaron 583: This requires that the
1.1 deraadt 584: .Dv LINEMODE
585: option be enabled.
586: .It Ic \&?
587: Prints out help information for the
588: .Ic mode
589: command.
590: .El
591: .It Xo
592: .Ic open Ar host
1.5 deraadt 593: .Op Fl l Ar user
594: .Oo Op Fl
1.1 deraadt 595: .Ar port Oc
596: .Xc
597: Open a connection to the named host.
598: If no port number
599: is specified,
1.22 aaron 600: .Nm
1.1 deraadt 601: will attempt to contact a
602: .Tn TELNET
603: server at the default port.
604: The host specification may be either a host name (see
1.7 deraadt 605: .Xr hosts 5 )
1.12 aaron 606: or an Internet address specified in the ``dot notation'' (see
1.1 deraadt 607: .Xr inet 3 ) .
608: The
1.5 deraadt 609: .Fl l
1.1 deraadt 610: option may be used to specify the user name
611: to be passed to the remote system via the
612: .Ev ENVIRON
613: option.
614: When connecting to a non-standard port,
1.22 aaron 615: .Nm
1.1 deraadt 616: omits any automatic initiation of
617: .Tn TELNET
1.22 aaron 618: options.
619: When the port number is preceded by a minus sign,
1.1 deraadt 620: the initial option negotiation is done.
621: After establishing a connection, the file
622: .Pa \&.telnetrc
623: in the
1.22 aaron 624: user's home directory is opened.
625: Lines beginning with a ``#'' are
626: comment lines.
627: Blank lines are ignored.
628: Lines that begin
629: without whitespace are the start of a machine entry.
630: The first thing on the line is the name of the machine that is
631: being connected to.
632: The rest of the line, and successive
1.21 aaron 633: lines that begin with whitespace are assumed to be
1.22 aaron 634: .Nm
1.1 deraadt 635: commands and are processed as if they had been typed
636: in manually to the
1.22 aaron 637: .Nm
1.1 deraadt 638: command prompt.
639: .It Ic quit
640: Close any open
641: .Tn TELNET
642: session and exit
1.12 aaron 643: .Nm telnet .
644: An end-of-file (in command mode) will also close a session and exit.
1.16 aaron 645: .It Ic send Ar arguments
1.1 deraadt 646: Sends one or more special character sequences to the remote host.
647: The following are the arguments which may be specified
648: (more than one argument may be specified at a time):
649: .Bl -tag -width escape
650: .It Ic abort
651: Sends the
652: .Dv TELNET ABORT
653: (Abort
654: processes)
655: sequence.
656: .It Ic ao
657: Sends the
658: .Dv TELNET AO
659: (Abort Output) sequence, which should cause the remote system to flush
660: all output
661: .Em from
662: the remote system
663: .Em to
664: the user's terminal.
665: .It Ic ayt
666: Sends the
667: .Dv TELNET AYT
668: (Are You There)
669: sequence, to which the remote system may or may not choose to respond.
670: .It Ic brk
671: Sends the
672: .Dv TELNET BRK
673: (Break) sequence, which may have significance to the remote
674: system.
675: .It Ic ec
676: Sends the
677: .Dv TELNET EC
678: (Erase Character)
679: sequence, which should cause the remote system to erase the last character
680: entered.
681: .It Ic el
682: Sends the
683: .Dv TELNET EL
684: (Erase Line)
685: sequence, which should cause the remote system to erase the line currently
686: being entered.
687: .It Ic eof
688: Sends the
689: .Dv TELNET EOF
690: (End Of File)
691: sequence.
692: .It Ic eor
693: Sends the
694: .Dv TELNET EOR
695: (End of Record)
696: sequence.
697: .It Ic escape
698: Sends the current
1.22 aaron 699: .Nm
1.12 aaron 700: escape character (initially ``^]'').
1.1 deraadt 701: .It Ic ga
702: Sends the
703: .Dv TELNET GA
704: (Go Ahead)
705: sequence, which likely has no significance to the remote system.
706: .It Ic getstatus
707: If the remote side supports the
708: .Dv TELNET STATUS
709: command,
710: .Ic getstatus
711: will send the subnegotiation to request that the server send
712: its current option status.
713: .It Ic ip
714: Sends the
715: .Dv TELNET IP
716: (Interrupt Process) sequence, which should cause the remote
717: system to abort the currently running process.
718: .It Ic nop
719: Sends the
720: .Dv TELNET NOP
721: (No OPeration)
722: sequence.
723: .It Ic susp
724: Sends the
725: .Dv TELNET SUSP
726: (SUSPend process)
727: sequence.
728: .It Ic synch
729: Sends the
730: .Dv TELNET SYNCH
731: sequence.
732: This sequence causes the remote system to discard all previously typed
733: (but not yet read) input.
734: This sequence is sent as
735: .Tn TCP
736: urgent
737: data (and may not work if the remote system is a
738: .Bx 4.2
739: system -- if
1.12 aaron 740: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 741: .It Ic do Ar cmd
1.12 aaron 742: Sends the
743: .Dv TELNET DO
744: .Ar cmd
745: sequence.
746: .Ar cmd
747: can be either a decimal number between 0 and 255,
748: or a symbolic name for a specific
749: .Dv TELNET
750: command.
751: .Ar cmd
752: can also be either
753: .Ic help
754: or
755: .Ic \&?
756: to print out help information, including
757: a list of known symbolic names.
1.1 deraadt 758: .It Ic dont Ar cmd
1.12 aaron 759: Sends the
760: .Dv TELNET DONT
761: .Ar cmd
762: sequence.
763: .Ar cmd
764: can be either a decimal number between 0 and 255,
765: or a symbolic name for a specific
766: .Dv TELNET
767: command.
768: .Ar cmd
769: can also be either
770: .Ic help
771: or
772: .Ic \&?
773: to print out help information, including
774: a list of known symbolic names.
1.1 deraadt 775: .It Ic will Ar cmd
1.12 aaron 776: Sends the
777: .Dv TELNET WILL
778: .Ar cmd
779: sequence.
780: .Ar cmd
781: can be either a decimal number between 0 and 255,
782: or a symbolic name for a specific
783: .Dv TELNET
784: command.
785: .Ar cmd
786: can also be either
787: .Ic help
788: or
789: .Ic \&?
790: to print out help information, including
791: a list of known symbolic names.
1.1 deraadt 792: .It Ic wont Ar cmd
793: Sends the
1.12 aaron 794: .Dv TELNET WONT
1.1 deraadt 795: .Ar cmd
796: sequence.
1.12 aaron 797: .Ar cmd
1.1 deraadt 798: can be either a decimal number between 0 and 255,
799: or a symbolic name for a specific
800: .Dv TELNET
801: command.
1.12 aaron 802: .Ar cmd
1.1 deraadt 803: can also be either
804: .Ic help
805: or
806: .Ic \&?
807: to print out help information, including
808: a list of known symbolic names.
809: .It Ic \&?
810: Prints out help information for the
811: .Ic send
812: command.
813: .El
1.16 aaron 814: .It Ic set Ar argument value
815: .It Ic unset Ar argument value
1.1 deraadt 816: The
817: .Ic set
818: command will set any one of a number of
1.22 aaron 819: .Nm
1.1 deraadt 820: variables to a specific value or to
821: .Dv TRUE .
822: The special value
823: .Ic off
824: turns off the function associated with
1.12 aaron 825: the variable; this is equivalent to using the
1.1 deraadt 826: .Ic unset
827: command.
828: The
829: .Ic unset
830: command will disable or set to
831: .Dv FALSE
832: any of the specified functions.
833: The values of variables may be interrogated with the
834: .Ic display
835: command.
836: The variables which may be set or unset, but not toggled, are
1.22 aaron 837: listed here.
838: In addition, any of the variables for the
1.1 deraadt 839: .Ic toggle
840: command may be explicitly set or unset using
841: the
842: .Ic set
843: and
844: .Ic unset
845: commands.
846: .Bl -tag -width escape
847: .It Ic ayt
848: If
849: .Tn TELNET
1.12 aaron 850: is in
851: .Ic localchars
852: mode, or
1.1 deraadt 853: .Dv LINEMODE
854: is enabled, and the status character is typed, a
855: .Dv TELNET AYT
856: sequence (see
857: .Ic send ayt
858: preceding) is sent to the
1.22 aaron 859: remote host.
860: The initial value for the "Are You There"
1.1 deraadt 861: character is the terminal's status character.
862: .It Ic echo
1.12 aaron 863: This is the value (initially ``^E'') which, when in
864: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 865: of entered characters (for normal processing), and suppressing
866: echoing of entered characters (for entering, say, a password).
867: .It Ic eof
868: If
1.22 aaron 869: .Nm
1.1 deraadt 870: is operating in
871: .Dv LINEMODE
1.12 aaron 872: or ``old line by line'' mode, entering this character
1.1 deraadt 873: as the first character on a line will cause this character to be
874: sent to the remote system.
1.12 aaron 875: The initial value of the
876: .Ic eof
877: character is taken to be the terminal's
1.1 deraadt 878: .Ic eof
879: character.
880: .It Ic erase
881: If
1.22 aaron 882: .Nm
1.1 deraadt 883: is in
884: .Ic localchars
885: mode (see
886: .Ic toggle
887: .Ic localchars
888: below),
1.12 aaron 889: and if
1.22 aaron 890: .Nm
1.12 aaron 891: is operating in ``character at a time'' mode, then when this
1.1 deraadt 892: character is typed, a
893: .Dv TELNET EC
894: sequence (see
895: .Ic send
896: .Ic ec
897: above)
898: is sent to the remote system.
1.12 aaron 899: The initial value for the
900: .Ic erase
901: character is taken to be
1.1 deraadt 902: the terminal's
903: .Ic erase
904: character.
905: .It Ic escape
906: This is the
1.22 aaron 907: .Nm
1.12 aaron 908: escape character (initially ``^['') which causes entry
1.1 deraadt 909: into
1.22 aaron 910: .Nm
1.1 deraadt 911: command mode (when connected to a remote system).
912: .It Ic flushoutput
913: If
1.22 aaron 914: .Nm
1.1 deraadt 915: is in
916: .Ic localchars
917: mode (see
918: .Ic toggle
919: .Ic localchars
920: below)
921: and the
922: .Ic flushoutput
923: character is typed, a
924: .Dv TELNET AO
925: sequence (see
926: .Ic send
927: .Ic ao
928: above)
929: is sent to the remote host.
1.12 aaron 930: The initial value for the
931: .Ic flush
932: character is taken to be
1.1 deraadt 933: the terminal's
934: .Ic flush
935: character.
936: .It Ic forw1
937: .It Ic forw2
938: If
939: .Tn TELNET
940: is operating in
941: .Dv LINEMODE ,
942: these are the
943: characters that, when typed, cause partial lines to be
1.22 aaron 944: forwarded to the remote system.
945: The initial value for
1.1 deraadt 946: the forwarding characters are taken from the terminal's
947: eol and eol2 characters.
948: .It Ic interrupt
949: If
1.22 aaron 950: .Nm
1.1 deraadt 951: is in
952: .Ic localchars
953: mode (see
954: .Ic toggle
955: .Ic localchars
956: below)
957: and the
958: .Ic interrupt
959: character is typed, a
960: .Dv TELNET IP
961: sequence (see
962: .Ic send
963: .Ic ip
964: above)
965: is sent to the remote host.
1.12 aaron 966: The initial value for the
967: .Ic interrupt
968: character is taken to be
1.1 deraadt 969: the terminal's
970: .Ic intr
971: character.
972: .It Ic kill
973: If
1.22 aaron 974: .Nm
1.1 deraadt 975: is in
976: .Ic localchars
977: mode (see
978: .Ic toggle
979: .Ic localchars
980: below),
1.12 aaron 981: and if
1.22 aaron 982: .Nm
1.12 aaron 983: is operating in ``character at a time'' mode, then when this
1.1 deraadt 984: character is typed, a
985: .Dv TELNET EL
986: sequence (see
987: .Ic send
988: .Ic el
989: above)
990: is sent to the remote system.
1.12 aaron 991: The initial value for the
992: .Ic kill
993: character is taken to be
1.1 deraadt 994: the terminal's
995: .Ic kill
996: character.
997: .It Ic lnext
998: If
1.22 aaron 999: .Nm
1.1 deraadt 1000: is operating in
1001: .Dv LINEMODE
1.12 aaron 1002: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1003: be the terminal's
1004: .Ic lnext
1005: character.
1.12 aaron 1006: The initial value for the
1007: .Ic lnext
1008: character is taken to be
1.1 deraadt 1009: the terminal's
1010: .Ic lnext
1011: character.
1012: .It Ic quit
1013: If
1.22 aaron 1014: .Nm
1.1 deraadt 1015: is in
1016: .Ic localchars
1017: mode (see
1018: .Ic toggle
1019: .Ic localchars
1020: below)
1021: and the
1022: .Ic quit
1023: character is typed, a
1024: .Dv TELNET BRK
1025: sequence (see
1026: .Ic send
1027: .Ic brk
1028: above)
1029: is sent to the remote host.
1.12 aaron 1030: The initial value for the
1031: .Ic quit
1032: character is taken to be
1.1 deraadt 1033: the terminal's
1034: .Ic quit
1035: character.
1036: .It Ic reprint
1037: If
1.22 aaron 1038: .Nm
1.1 deraadt 1039: is operating in
1040: .Dv LINEMODE
1.12 aaron 1041: or old line by line'' mode, then this character is taken to
1.1 deraadt 1042: be the terminal's
1043: .Ic reprint
1044: character.
1.12 aaron 1045: The initial value for the
1046: .Ic reprint
1047: character is taken to be
1.1 deraadt 1048: the terminal's
1049: .Ic reprint
1050: character.
1051: .It Ic rlogin
1052: This is the rlogin escape character.
1053: If set, the normal
1054: .Tn TELNET
1055: escape character is ignored unless it is
1056: preceded by this character at the beginning of a line.
1.12 aaron 1057: This character, at the beginning of a line, followed by
1058: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1059: suspends the
1.22 aaron 1060: .Nm
1061: command.
1062: The initial state is to
1.12 aaron 1063: disable the
1064: .Ic rlogin
1065: escape character.
1.1 deraadt 1066: .It Ic start
1067: If the
1068: .Dv TELNET TOGGLE-FLOW-CONTROL
1069: option has been enabled,
1070: then this character is taken to
1071: be the terminal's
1072: .Ic start
1073: character.
1.12 aaron 1074: The initial value for the
1075: .Ic start
1076: character is taken to be
1.1 deraadt 1077: the terminal's
1078: .Ic start
1079: character.
1080: .It Ic stop
1081: If the
1082: .Dv TELNET TOGGLE-FLOW-CONTROL
1083: option has been enabled,
1084: then this character is taken to
1085: be the terminal's
1086: .Ic stop
1087: character.
1.12 aaron 1088: The initial value for the
1089: .Ic stop
1090: character is taken to be
1.1 deraadt 1091: the terminal's
1092: .Ic stop
1093: character.
1094: .It Ic susp
1095: If
1.22 aaron 1096: .Nm
1.1 deraadt 1097: is in
1098: .Ic localchars
1099: mode, or
1100: .Dv LINEMODE
1101: is enabled, and the
1102: .Ic suspend
1103: character is typed, a
1104: .Dv TELNET SUSP
1105: sequence (see
1106: .Ic send
1107: .Ic susp
1108: above)
1109: is sent to the remote host.
1.12 aaron 1110: The initial value for the
1111: .Ic suspend
1112: character is taken to be
1.1 deraadt 1113: the terminal's
1114: .Ic suspend
1115: character.
1116: .It Ic tracefile
1117: This is the file to which the output, caused by
1118: .Ic netdata
1119: or
1120: .Ic option
1121: tracing being
1122: .Dv TRUE ,
1.22 aaron 1123: will be written.
1124: If it is set to
1.1 deraadt 1125: .Dq Fl ,
1126: then tracing information will be written to standard output (the default).
1127: .It Ic worderase
1128: If
1.22 aaron 1129: .Nm
1.1 deraadt 1130: is operating in
1131: .Dv LINEMODE
1.12 aaron 1132: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1133: be the terminal's
1134: .Ic worderase
1135: character.
1.12 aaron 1136: The initial value for the
1137: .Ic worderase
1138: character is taken to be
1.1 deraadt 1139: the terminal's
1140: .Ic worderase
1141: character.
1142: .It Ic \&?
1143: Displays the legal
1144: .Ic set
1145: .Pq Ic unset
1146: commands.
1147: .El
1.17 aaron 1148: .It Ic skey Ar sequence challenge
1149: The
1150: .Ic skey
1.23 aaron 1151: command computes a response to the S/Key challenge.
1152: See
1.17 aaron 1153: .Xr skey 1
1154: for more information on the S/Key system.
1.16 aaron 1155: .It Ic slc Ar state
1.1 deraadt 1156: The
1157: .Ic slc
1158: command (Set Local Characters) is used to set
1.4 deraadt 1159: or change the state of the special
1.16 aaron 1160: characters when the
1.1 deraadt 1161: .Dv TELNET LINEMODE
1162: option has
1.22 aaron 1163: been enabled.
1164: Special characters are characters that get mapped to
1.1 deraadt 1165: .Tn TELNET
1166: commands sequences (like
1167: .Ic ip
1168: or
1.22 aaron 1169: .Ic quit )
1.1 deraadt 1170: or line editing characters (like
1171: .Ic erase
1172: and
1.22 aaron 1173: .Ic kill ) .
1.1 deraadt 1174: By default, the local special characters are exported.
1175: .Bl -tag -width Fl
1176: .It Ic check
1177: Verify the current settings for the current special characters.
1178: The remote side is requested to send all the current special
1179: character settings, and if there are any discrepancies with
1180: the local side, the local side will switch to the remote value.
1181: .It Ic export
1.22 aaron 1182: Switch to the local defaults for the special characters.
1183: The local default characters are those of the local terminal at
1.1 deraadt 1184: the time when
1.22 aaron 1185: .Nm
1.1 deraadt 1186: was started.
1187: .It Ic import
1188: Switch to the remote defaults for the special characters.
1189: The remote default characters are those of the remote system
1.16 aaron 1190: at the time when the
1.1 deraadt 1191: .Tn TELNET
1192: connection was established.
1193: .It Ic \&?
1194: Prints out help information for the
1195: .Ic slc
1196: command.
1197: .El
1198: .It Ic status
1199: Show the current status of
1.12 aaron 1200: .Nm telnet .
1.1 deraadt 1201: This includes the peer one is connected to, as well
1202: as the current mode.
1.16 aaron 1203: .It Ic toggle Ar arguments Op Ar ...
1.1 deraadt 1204: Toggle (between
1205: .Dv TRUE
1206: and
1207: .Dv FALSE )
1208: various flags that control how
1.22 aaron 1209: .Nm
1.1 deraadt 1210: responds to events.
1211: These flags may be set explicitly to
1212: .Dv TRUE
1213: or
1214: .Dv FALSE
1215: using the
1216: .Ic set
1217: and
1218: .Ic unset
1219: commands listed above.
1220: More than one argument may be specified.
1221: The state of these flags may be interrogated with the
1222: .Ic display
1223: command.
1224: Valid arguments are:
1225: .Bl -tag -width Ar
1226: .It Ic authdebug
1227: Turns on debugging information for the authentication code.
1228: .It Ic autoflush
1229: If
1230: .Ic autoflush
1231: and
1232: .Ic localchars
1233: are both
1234: .Dv TRUE ,
1235: then when the
1.12 aaron 1236: .Ic ao
1.1 deraadt 1237: or
1238: .Ic quit
1239: characters are recognized (and transformed into
1240: .Tn TELNET
1241: sequences; see
1242: .Ic set
1243: above for details),
1.22 aaron 1244: .Nm
1.1 deraadt 1245: refuses to display any data on the user's terminal
1246: until the remote system acknowledges (via a
1247: .Dv TELNET TIMING MARK
1248: option)
1249: that it has processed those
1250: .Tn TELNET
1251: sequences.
1252: The initial value for this toggle is
1253: .Dv TRUE
1254: if the terminal user had not
1255: done an "stty noflsh", otherwise
1256: .Dv FALSE
1257: (see
1.22 aaron 1258: .Xr stty 1 ) .
1.1 deraadt 1259: .It Ic autodecrypt
1260: When the
1261: .Dv TELNET ENCRYPT
1262: option is negotiated, by
1263: default the actual encryption (decryption) of the data
1.22 aaron 1264: stream does not start automatically.
1265: The
1.12 aaron 1266: .Ic autoencrypt
1267: .Pq Ic autodecrypt
1268: command states that encryption of the
1.1 deraadt 1269: output (input) stream should be enabled as soon as
1270: possible.
1271: .Pp
1272: .It Ic autologin
1273: If the remote side supports the
1274: .Dv TELNET AUTHENTICATION
1275: option
1276: .Tn TELNET
1.22 aaron 1277: attempts to use it to perform automatic authentication.
1278: If the
1.1 deraadt 1279: .Dv AUTHENTICATION
1280: option is not supported, the user's login
1281: name are propagated through the
1282: .Dv TELNET ENVIRON
1283: option.
1284: This command is the same as specifying
1285: .Ar a
1286: option on the
1287: .Ic open
1288: command.
1289: .It Ic autosynch
1290: If
1291: .Ic autosynch
1292: and
1293: .Ic localchars
1294: are both
1295: .Dv TRUE ,
1296: then when either the
1297: .Ic intr
1298: or
1299: .Ic quit
1.12 aaron 1300: character is typed (see
1.1 deraadt 1301: .Ic set
1302: above for descriptions of the
1303: .Ic intr
1304: and
1305: .Ic quit
1306: characters), the resulting
1307: .Tn TELNET
1308: sequence sent is followed by the
1309: .Dv TELNET SYNCH
1310: sequence.
1311: This procedure
1.12 aaron 1312: .Em should
1.1 deraadt 1313: cause the remote system to begin throwing away all previously
1314: typed input until both of the
1315: .Tn TELNET
1316: sequences have been read and acted upon.
1317: The initial value of this toggle is
1318: .Dv FALSE .
1319: .It Ic binary
1320: Enable or disable the
1321: .Dv TELNET BINARY
1322: option on both input and output.
1323: .It Ic inbinary
1324: Enable or disable the
1325: .Dv TELNET BINARY
1326: option on input.
1327: .It Ic outbinary
1328: Enable or disable the
1329: .Dv TELNET BINARY
1330: option on output.
1331: .It Ic crlf
1332: If this is
1333: .Dv TRUE ,
1334: then carriage returns will be sent as
1335: .Li <CR><LF> .
1336: If this is
1337: .Dv FALSE ,
1338: then carriage returns will be send as
1339: .Li <CR><NUL> .
1340: The initial value for this toggle is
1341: .Dv FALSE .
1342: .It Ic crmod
1343: Toggle carriage return mode.
1344: When this mode is enabled, most carriage return characters received from
1345: the remote host will be mapped into a carriage return followed by
1346: a line feed.
1347: This mode does not affect those characters typed by the user, only
1348: those received from the remote host.
1349: This mode is not very useful unless the remote host
1.12 aaron 1350: only sends carriage return, but never line feeds.
1.1 deraadt 1351: The initial value for this toggle is
1352: .Dv FALSE .
1353: .It Ic debug
1.12 aaron 1354: Toggles socket level debugging (useful only to the super-user).
1.1 deraadt 1355: The initial value for this toggle is
1356: .Dv FALSE .
1357: .It Ic encdebug
1358: Turns on debugging information for the encryption code.
1359: .It Ic localchars
1360: If this is
1361: .Dv TRUE ,
1362: then the
1.12 aaron 1363: .Ic flush ,
1.1 deraadt 1364: .Ic interrupt ,
1.12 aaron 1365: .Ic quit ,
1.1 deraadt 1366: .Ic erase ,
1367: and
1368: .Ic kill
1369: characters (see
1370: .Ic set
1371: above) are recognized locally, and transformed into (hopefully) appropriate
1372: .Tn TELNET
1373: control sequences
1374: (respectively
1.12 aaron 1375: .Ic ao ,
1.1 deraadt 1376: .Ic ip ,
1.12 aaron 1377: .Ic brk ,
1.1 deraadt 1378: .Ic ec ,
1379: and
1.22 aaron 1380: .Ic el ;
1.1 deraadt 1381: see
1382: .Ic send
1383: above).
1384: The initial value for this toggle is
1385: .Dv TRUE
1.12 aaron 1386: in ``old line by line'' mode,
1.1 deraadt 1387: and
1388: .Dv FALSE
1.12 aaron 1389: in ``character at a time'' mode.
1.1 deraadt 1390: When the
1391: .Dv LINEMODE
1392: option is enabled, the value of
1393: .Ic localchars
1394: is ignored, and assumed to always be
1395: .Dv TRUE .
1396: If
1397: .Dv LINEMODE
1398: has ever been enabled, then
1399: .Ic quit
1400: is sent as
1.12 aaron 1401: .Ic abort ,
1402: and
1403: .Ic eof
1.1 deraadt 1404: and
1.5 deraadt 1405: .Ic suspend
1.1 deraadt 1406: are sent as
1.12 aaron 1407: .Ic eof
1408: and
1.5 deraadt 1409: .Ic susp
1410: (see
1.1 deraadt 1411: .Ic send
1412: above).
1413: .It Ic netdata
1414: Toggles the display of all network data (in hexadecimal format).
1415: The initial value for this toggle is
1416: .Dv FALSE .
1417: .It Ic options
1418: Toggles the display of some internal
1.22 aaron 1419: .Nm
1.1 deraadt 1420: protocol processing (having to do with
1421: .Tn TELNET
1422: options).
1423: The initial value for this toggle is
1424: .Dv FALSE .
1425: .It Ic prettydump
1426: When the
1427: .Ic netdata
1428: toggle is enabled, if
1429: .Ic prettydump
1430: is enabled the output from the
1431: .Ic netdata
1432: command will be formatted in a more user readable format.
1433: Spaces are put between each character in the output, and the
1434: beginning of any
1435: .Tn TELNET
1436: escape sequence is preceded by a '*' to aid in locating them.
1437: .It Ic skiprc
1438: When the skiprc toggle is
1439: .Dv TRUE ,
1440: .Tn TELNET
1441: skips the reading of the
1442: .Pa \&.telnetrc
1.12 aaron 1443: file in the user's home
1.22 aaron 1444: directory when connections are opened.
1445: The initial value for this toggle is
1.13 aaron 1446: .Dv FALSE .
1.1 deraadt 1447: .It Ic termdata
1448: Toggles the display of all terminal data (in hexadecimal format).
1449: The initial value for this toggle is
1450: .Dv FALSE .
1451: .It Ic verbose_encrypt
1452: When the
1453: .Ic verbose_encrypt
1454: toggle is
1455: .Dv TRUE ,
1.22 aaron 1456: .Nm
1.1 deraadt 1457: prints out a message each time encryption is enabled or
1.22 aaron 1458: disabled.
1459: The initial value for this toggle is
1.13 aaron 1460: .Dv FALSE .
1.1 deraadt 1461: .It Ic \&?
1462: Displays the legal
1463: .Ic toggle
1464: commands.
1465: .El
1466: .It Ic z
1467: Suspend
1.12 aaron 1468: .Nm telnet .
1.1 deraadt 1469: This command only works when the user is using the
1.12 aaron 1470: .Xr csh 1 .
1.16 aaron 1471: .It Ic \&! Op Ar command
1.1 deraadt 1472: Execute a single command in a subshell on the local
1.22 aaron 1473: system.
1474: If
1.5 deraadt 1475: .Ar command
1.1 deraadt 1476: is omitted, then an interactive
1477: subshell is invoked.
1.16 aaron 1478: .It Ic \&? Op Ar command
1.22 aaron 1479: Get help.
1480: With no arguments,
1481: .Nm
1.1 deraadt 1482: prints a help summary.
1483: If a command is specified,
1.22 aaron 1484: .Nm
1.1 deraadt 1485: will print the help information for just that command.
1486: .El
1487: .Sh ENVIRONMENT
1.22 aaron 1488: .Nm
1.1 deraadt 1489: uses at least the
1490: .Ev HOME ,
1491: .Ev SHELL ,
1492: .Ev DISPLAY ,
1493: and
1494: .Ev TERM
1495: environment variables.
1496: Other environment variables may be propagated
1497: to the other side via the
1498: .Dv TELNET ENVIRON
1499: option.
1500: .Sh FILES
1501: .Bl -tag -width ~/.telnetrc -compact
1502: .It Pa ~/.telnetrc
1503: user customized telnet startup values
1504: .El
1505: .Sh HISTORY
1506: The
1.22 aaron 1507: .Nm
1.1 deraadt 1508: command appeared in
1509: .Bx 4.2 .
1510: .Sh NOTES
1511: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1512: ``old line by line'' mode.
1.1 deraadt 1513: .Pp
1.16 aaron 1514: In ``old line by line'' mode or
1.1 deraadt 1515: .Dv LINEMODE
1516: the terminal's
1517: .Ic eof
1518: character is only recognized (and sent to the remote system)
1519: when it is the first character on a line.
1.20 itojun 1520: .Pp
1521: Source routing is not supported yet for IPv6.
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