Annotation of src/usr.bin/telnet/telnet.1, Revision 1.26
1.26 ! aaron 1: .\" $OpenBSD: telnet.1,v 1.25 2000/04/15 11:45:56 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
1.26 ! aaron 47: .Op Fl 8EFKLacdfrx
1.1 deraadt 48: .Op Fl X Ar authtype
1.3 niklas 49: .Op Fl b Ar hostalias
1.1 deraadt 50: .Op Fl e Ar escapechar
51: .Op Fl k Ar realm
52: .Op Fl l Ar user
53: .Op Fl n Ar tracefile
54: .Oo
55: .Ar host
1.9 deraadt 56: .Op Ar port
1.1 deraadt 57: .Oc
58: .Sh DESCRIPTION
59: The
1.22 aaron 60: .Nm
1.1 deraadt 61: command
1.16 aaron 62: is used to communicate with another host using the
1.1 deraadt 63: .Tn TELNET
64: protocol.
65: If
1.22 aaron 66: .Nm
1.1 deraadt 67: is invoked without the
68: .Ar host
69: argument, it enters command mode,
70: indicated by its prompt
71: .Pq Nm telnet\&> .
72: In this mode, it accepts and executes the commands listed below.
73: If it is invoked with arguments, it performs an
74: .Ic open
75: command with those arguments.
76: .Pp
1.19 aaron 77: The options are as follows:
1.1 deraadt 78: .Bl -tag -width indent
79: .It Fl 8
1.22 aaron 80: Specifies an 8-bit data path.
81: This causes an attempt to negotiate the
1.1 deraadt 82: .Dv TELNET BINARY
83: option on both input and output.
84: .It Fl E
85: Stops any character from being recognized as an escape character.
86: .It Fl F
87: If Kerberos V5 authentication is being used, the
88: .Fl F
89: option allows the local credentials to be forwarded
90: to the remote system, including any credentials that
91: have already been forwarded into the local environment.
92: .It Fl K
93: Specifies no automatic login to the remote system.
94: .It Fl L
1.22 aaron 95: Specifies an 8-bit data path on output.
96: This causes the BINARY option to be negotiated on output.
1.16 aaron 97: .It Fl X Ar atype
1.1 deraadt 98: Disables the
99: .Ar atype
100: type of authentication.
101: .It Fl a
102: Attempt automatic login.
103: Currently, this sends the user name via the
104: .Ev USER
105: variable
106: of the
107: .Ev ENVIRON
108: option if supported by the remote system.
109: The name used is that of the current user as returned by
110: .Xr getlogin 2
111: if it agrees with the current user ID,
112: otherwise it is the name associated with the user ID.
1.3 niklas 113: .It Fl b Ar hostalias
114: Uses
115: .Xr bind 2
1.12 aaron 116: on the local socket to bind it to an aliased address (see
1.3 niklas 117: .Xr ifconfig 8
1.12 aaron 118: and the ``alias'' specifier) or to the address of
1.3 niklas 119: another interface than the one naturally chosen by
120: .Xr connect 2 .
1.12 aaron 121: This can be useful when connecting to services which use IP addresses
1.3 niklas 122: for authentication and reconfiguration of the server is undesirable (or
123: impossible).
1.1 deraadt 124: .It Fl c
125: Disables the reading of the user's
126: .Pa \&.telnetrc
1.22 aaron 127: file.
128: (See the
1.1 deraadt 129: .Ic toggle skiprc
130: command on this man page.)
131: .It Fl d
132: Sets the initial value of the
133: .Ic debug
134: toggle to
1.12 aaron 135: .Dv TRUE .
1.16 aaron 136: .It Fl e Ar escapechar
1.1 deraadt 137: Sets the initial
138: .Nm
139: escape character to
1.9 deraadt 140: .Ar escapechar Ns .
1.1 deraadt 141: If
1.8 deraadt 142: .Ar escapechar
1.1 deraadt 143: is omitted, then
144: there will be no escape character.
145: .It Fl f
146: If Kerberos V5 authentication is being used, the
147: .Fl f
148: option allows the local credentials to be forwarded to the remote system.
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
157: instead of the remote host's realm, as determined
1.1 deraadt 158: by
159: .Xr krb_realmofhost 3 .
1.16 aaron 160: .It Fl l Ar user
1.1 deraadt 161: When connecting to the remote system, if the remote system
162: understands the
163: .Ev ENVIRON
164: option, then
165: .Ar user
166: will be sent to the remote system as the value for the variable USER.
167: This option implies the
168: .Fl a
169: option.
170: This option may also be used with the
171: .Ic open
172: command.
1.16 aaron 173: .It Fl n Ar tracefile
1.1 deraadt 174: Opens
175: .Ar tracefile
176: for recording trace information.
177: See the
178: .Ic set tracefile
179: command below.
180: .It Fl r
181: Specifies a user interface similar to
182: .Xr rlogin 1 .
183: In this
184: mode, the escape character is set to the tilde (~) character,
1.8 deraadt 185: unless modified by the
186: .Fl e
187: option.
1.1 deraadt 188: .It Fl x
1.10 art 189: Turns on encryption of the data stream if possible.
1.1 deraadt 190: .It Ar host
191: Indicates the official name, an alias, or the Internet address
192: of a remote host.
193: .It Ar port
1.22 aaron 194: Indicates a port number (address of an application).
195: If a number is not specified, the default
196: .Nm
1.1 deraadt 197: port is used.
198: .El
199: .Pp
1.22 aaron 200: When in rlogin mode, a line of the form ~.
201: disconnects from the
1.1 deraadt 202: remote host; ~ is the telnet escape character.
203: Similarly, the line ~^Z suspends the telnet session.
204: The line ~^] escapes to the normal telnet escape prompt.
205: .Pp
206: Once a connection has been opened,
1.22 aaron 207: .Nm
1.1 deraadt 208: will attempt to enable the
209: .Dv TELNET LINEMODE
210: option.
1.12 aaron 211: If this fails,
1.22 aaron 212: .Nm
1.1 deraadt 213: will revert to one of two input modes:
1.12 aaron 214: either ``character at a time''
215: or ``old line by line''
1.1 deraadt 216: depending on what the remote system supports.
217: .Pp
1.16 aaron 218: When
1.1 deraadt 219: .Dv LINEMODE
220: is enabled, character processing is done on the
1.22 aaron 221: local system, under the control of the remote system.
222: When input
1.1 deraadt 223: editing or character echoing is to be disabled, the remote system
1.22 aaron 224: will relay that information.
225: The remote system will also relay
1.1 deraadt 226: changes to any special characters that happen on the remote
227: system, so that they can take effect on the local system.
228: .Pp
1.12 aaron 229: In ``character at a time'' mode, most
1.1 deraadt 230: text typed is immediately sent to the remote host for processing.
231: .Pp
1.12 aaron 232: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 233: and (normally) only completed lines are sent to the remote host.
1.12 aaron 234: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 235: to turn off and on the local echo
236: (this would mostly be used to enter passwords
237: without the password being echoed).
238: .Pp
1.16 aaron 239: If the
1.1 deraadt 240: .Dv LINEMODE
241: option is enabled, or if the
242: .Ic localchars
243: toggle is
244: .Dv TRUE
1.12 aaron 245: (the default for ``old line by line''; see below),
1.1 deraadt 246: the user's
1.12 aaron 247: .Ic quit ,
1.1 deraadt 248: .Ic intr ,
249: and
250: .Ic flush
251: characters are trapped locally, and sent as
252: .Tn TELNET
253: protocol sequences to the remote side.
1.16 aaron 254: If
1.1 deraadt 255: .Dv LINEMODE
256: has ever been enabled, then the user's
257: .Ic susp
258: and
259: .Ic eof
260: are also sent as
261: .Tn TELNET
262: protocol sequences,
263: and
264: .Ic quit
1.16 aaron 265: is sent as a
1.1 deraadt 266: .Dv TELNET ABORT
1.16 aaron 267: instead of
1.8 deraadt 268: .Dv BREAK .
1.1 deraadt 269: There are options (see
270: .Ic toggle
271: .Ic autoflush
272: and
273: .Ic toggle
274: .Ic autosynch
275: below)
276: which cause this action to flush subsequent output to the terminal
277: (until the remote host acknowledges the
278: .Tn TELNET
279: sequence) and flush previous terminal input
280: (in the case of
281: .Ic quit
282: and
1.22 aaron 283: .Ic intr ) .
1.1 deraadt 284: .Pp
285: While connected to a remote host,
1.22 aaron 286: .Nm
1.1 deraadt 287: command mode may be entered by typing the
1.22 aaron 288: .Nm
1.12 aaron 289: ``escape character'' (initially ``^]'').
1.1 deraadt 290: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 291: Note that the escape character will return to the command mode of the initial
1.18 alex 292: invocation of
1.22 aaron 293: .Nm
1.23 aaron 294: that has the controlling terminal.
295: Use the
1.15 aaron 296: .Cm send escape
297: command to switch to command mode in subsequent
1.22 aaron 298: .Nm
1.15 aaron 299: processes on remote hosts.
1.1 deraadt 300: .Pp
301: The following
1.22 aaron 302: .Nm
1.1 deraadt 303: commands are available.
304: Only enough of each command to uniquely identify it need be typed
305: (this is also true for arguments to the
1.12 aaron 306: .Ic mode ,
1.1 deraadt 307: .Ic set ,
1.12 aaron 308: .Ic toggle ,
1.1 deraadt 309: .Ic unset ,
1.12 aaron 310: .Ic slc ,
1.1 deraadt 311: .Ic environ ,
312: and
313: .Ic display
314: commands).
315: .Bl -tag -width "mode type"
1.16 aaron 316: .It Ic auth Ar argument Op Ar ...
1.12 aaron 317: The
318: .Ic auth
319: command manipulates the information sent through the
1.1 deraadt 320: .Dv TELNET AUTHENTICATE
1.22 aaron 321: option.
322: Valid arguments for the
323: .Ic auth
324: command are as follows:
1.1 deraadt 325: .Bl -tag -width "disable type"
326: .It Ic disable Ar type
1.12 aaron 327: Disables the specified
328: .Ar type
1.22 aaron 329: of authentication.
330: To obtain a list of available types, use the
1.1 deraadt 331: .Ic auth disable \&?
332: command.
333: .It Ic enable Ar type
1.12 aaron 334: Enables the specified
335: .Ar type
1.22 aaron 336: of authentication.
337: To obtain a list of available types, use the
1.1 deraadt 338: .Ic auth enable \&?
339: command.
340: .It Ic status
341: Lists the current status of the various types of
342: authentication.
343: .El
344: .It Ic close
345: Close a
346: .Tn TELNET
347: session and return to command mode.
1.16 aaron 348: .It Ic display Ar argument Op Ar ...
1.1 deraadt 349: Displays all, or some, of the
350: .Ic set
351: and
352: .Ic toggle
353: values (see below).
1.12 aaron 354: .It Ic encrypt Ar argument Op Ar ...
355: The
356: .Ic encrypt
357: command manipulates the information sent through the
1.1 deraadt 358: .Dv TELNET ENCRYPT
359: option.
1.14 aaron 360: .Pp
1.1 deraadt 361: Valid arguments for the encrypt command are as follows:
362: .Bl -tag -width Ar
363: .It Ic disable Ar type Ic [input|output]
1.12 aaron 364: Disables the specified
365: .Ar type
1.22 aaron 366: of encryption.
367: If you omit
1.12 aaron 368: .Ic input
369: and
370: .Ic output ,
371: both input and output
1.22 aaron 372: are disabled.
373: To obtain a list of available types, use the
1.1 deraadt 374: .Ic encrypt disable \&?
375: command.
376: .It Ic enable Ar type Ic [input|output]
1.12 aaron 377: Enables the specified
378: .Ar type
1.22 aaron 379: of encryption.
380: If you omit
1.12 aaron 381: .Ic input
382: and
383: .Ic output ,
384: both input and output are
1.22 aaron 385: enabled.
386: To obtain a list of available types, use the
1.1 deraadt 387: .Ic encrypt enable \&?
388: command.
389: .It Ic input
390: This is the same as the
391: .Ic encrypt start input
392: command.
393: .It Ic -input
394: This is the same as the
395: .Ic encrypt stop input
396: command.
397: .It Ic output
398: This is the same as the
399: .Ic encrypt start output
400: command.
401: .It Ic -output
402: This is the same as the
403: .Ic encrypt stop output
404: command.
405: .It Ic start Ic [input|output]
1.22 aaron 406: Attempts to start encryption.
407: If you omit
1.1 deraadt 408: .Ic input
409: and
1.24 aaron 410: .Ic output ,
1.22 aaron 411: both input and output are enabled.
412: To obtain a list of available types, use the
1.1 deraadt 413: .Ic encrypt enable \&?
414: command.
415: .It Ic status
416: Lists the current status of encryption.
417: .It Ic stop Ic [input|output]
1.22 aaron 418: Stops encryption.
419: If you omit
1.12 aaron 420: .Ic input
421: and
422: .Ic output ,
1.1 deraadt 423: encryption is on both input and output.
424: .It Ic type Ar type
425: Sets the default type of encryption to be used
426: with later
427: .Ic encrypt start
428: or
429: .Ic encrypt stop
430: commands.
431: .El
1.16 aaron 432: .It Ic environ Ar arguments Op Ar ...
1.1 deraadt 433: The
434: .Ic environ
435: command is used to manipulate the
1.11 deraadt 436: variables that may be sent through the
1.1 deraadt 437: .Dv TELNET ENVIRON
438: option.
439: The initial set of variables is taken from the users
440: environment, with only the
441: .Ev DISPLAY
442: and
443: .Ev PRINTER
444: variables being exported by default.
445: The
446: .Ev USER
447: variable is also exported if the
448: .Fl a
449: or
450: .Fl l
451: options are used.
452: .br
453: Valid arguments for the
454: .Ic environ
455: command are:
456: .Bl -tag -width Fl
1.16 aaron 457: .It Ic define Ar variable value
1.1 deraadt 458: Define the variable
459: .Ar variable
460: to have a value of
1.12 aaron 461: .Ar value .
1.1 deraadt 462: Any variables defined by this command are automatically exported.
463: The
464: .Ar value
465: may be enclosed in single or double quotes so
466: that tabs and spaces may be included.
1.16 aaron 467: .It Ic undefine Ar variable
1.1 deraadt 468: Remove
469: .Ar variable
470: from the list of environment variables.
1.16 aaron 471: .It Ic export Ar variable
1.1 deraadt 472: Mark the variable
473: .Ar variable
474: to be exported to the remote side.
1.16 aaron 475: .It Ic unexport Ar variable
1.1 deraadt 476: Mark the variable
477: .Ar variable
478: to not be exported unless
479: explicitly asked for by the remote side.
480: .It Ic list
481: List the current set of environment variables.
482: Those marked with a
483: .Cm *
484: will be sent automatically,
485: other variables will only be sent if explicitly requested.
486: .It Ic \&?
487: Prints out help information for the
488: .Ic environ
489: command.
490: .El
491: .It Ic logout
492: Sends the
493: .Dv TELNET LOGOUT
494: option to the remote side.
495: This command is similar to a
496: .Ic close
497: command; however, if the remote side does not support the
498: .Dv LOGOUT
499: option, nothing happens.
500: If, however, the remote side does support the
501: .Dv LOGOUT
502: option, this command should cause the remote side to close the
503: .Tn TELNET
504: connection.
505: If the remote side also supports the concept of
506: suspending a user's session for later reattachment,
507: the logout argument indicates that you
508: should terminate the session immediately.
1.16 aaron 509: .It Ic mode Ar type
1.12 aaron 510: .Ar type
1.1 deraadt 511: is one of several options, depending on the state of the
512: .Tn TELNET
513: session.
514: The remote host is asked for permission to go into the requested mode.
515: If the remote host is capable of entering that mode, the requested
516: mode will be entered.
517: .Bl -tag -width Ar
518: .It Ic character
519: Disable the
520: .Dv TELNET LINEMODE
521: option, or, if the remote side does not understand the
522: .Dv LINEMODE
1.12 aaron 523: option, then enter ``character at a time'' mode.
1.1 deraadt 524: .It Ic line
525: Enable the
526: .Dv TELNET LINEMODE
527: option, or, if the remote side does not understand the
528: .Dv LINEMODE
1.12 aaron 529: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 530: .It Ic isig Pq Ic \-isig
531: Attempt to enable (disable) the
1.1 deraadt 532: .Dv TRAPSIG
1.16 aaron 533: mode of the
1.1 deraadt 534: .Dv LINEMODE
535: option.
1.16 aaron 536: This requires that the
1.1 deraadt 537: .Dv LINEMODE
538: option be enabled.
1.16 aaron 539: .It Ic edit Pq Ic \-edit
540: Attempt to enable (disable) the
1.1 deraadt 541: .Dv EDIT
1.16 aaron 542: mode of the
1.1 deraadt 543: .Dv LINEMODE
544: option.
1.16 aaron 545: This requires that the
1.1 deraadt 546: .Dv LINEMODE
547: option be enabled.
1.16 aaron 548: .It Ic softtabs Pq Ic \-softtabs
549: Attempt to enable (disable) the
1.1 deraadt 550: .Dv SOFT_TAB
1.16 aaron 551: mode of the
1.1 deraadt 552: .Dv LINEMODE
553: option.
1.16 aaron 554: This requires that the
1.1 deraadt 555: .Dv LINEMODE
556: option be enabled.
1.16 aaron 557: .It Ic litecho Pq Ic \-litecho
558: Attempt to enable (disable) the
1.1 deraadt 559: .Dv LIT_ECHO
1.16 aaron 560: mode of the
1.1 deraadt 561: .Dv LINEMODE
562: option.
1.16 aaron 563: This requires that the
1.1 deraadt 564: .Dv LINEMODE
565: option be enabled.
566: .It Ic \&?
567: Prints out help information for the
568: .Ic mode
569: command.
570: .El
571: .It Xo
572: .Ic open Ar host
1.5 deraadt 573: .Op Fl l Ar user
574: .Oo Op Fl
1.1 deraadt 575: .Ar port Oc
576: .Xc
577: Open a connection to the named host.
578: If no port number
579: is specified,
1.22 aaron 580: .Nm
1.1 deraadt 581: will attempt to contact a
582: .Tn TELNET
583: server at the default port.
584: The host specification may be either a host name (see
1.7 deraadt 585: .Xr hosts 5 )
1.12 aaron 586: or an Internet address specified in the ``dot notation'' (see
1.1 deraadt 587: .Xr inet 3 ) .
588: The
1.5 deraadt 589: .Fl l
1.1 deraadt 590: option may be used to specify the user name
591: to be passed to the remote system via the
592: .Ev ENVIRON
593: option.
594: When connecting to a non-standard port,
1.22 aaron 595: .Nm
1.1 deraadt 596: omits any automatic initiation of
597: .Tn TELNET
1.22 aaron 598: options.
599: When the port number is preceded by a minus sign,
1.1 deraadt 600: the initial option negotiation is done.
601: After establishing a connection, the file
602: .Pa \&.telnetrc
603: in the
1.22 aaron 604: user's home directory is opened.
605: Lines beginning with a ``#'' are
606: comment lines.
607: Blank lines are ignored.
608: Lines that begin
609: without whitespace are the start of a machine entry.
610: The first thing on the line is the name of the machine that is
611: being connected to.
612: The rest of the line, and successive
1.21 aaron 613: lines that begin with whitespace are assumed to be
1.22 aaron 614: .Nm
1.1 deraadt 615: commands and are processed as if they had been typed
616: in manually to the
1.22 aaron 617: .Nm
1.1 deraadt 618: command prompt.
619: .It Ic quit
620: Close any open
621: .Tn TELNET
622: session and exit
1.12 aaron 623: .Nm telnet .
624: An end-of-file (in command mode) will also close a session and exit.
1.16 aaron 625: .It Ic send Ar arguments
1.1 deraadt 626: Sends one or more special character sequences to the remote host.
627: The following are the arguments which may be specified
628: (more than one argument may be specified at a time):
629: .Bl -tag -width escape
630: .It Ic abort
631: Sends the
632: .Dv TELNET ABORT
633: (Abort
634: processes)
635: sequence.
636: .It Ic ao
637: Sends the
638: .Dv TELNET AO
639: (Abort Output) sequence, which should cause the remote system to flush
640: all output
641: .Em from
642: the remote system
643: .Em to
644: the user's terminal.
645: .It Ic ayt
646: Sends the
647: .Dv TELNET AYT
648: (Are You There)
649: sequence, to which the remote system may or may not choose to respond.
650: .It Ic brk
651: Sends the
652: .Dv TELNET BRK
653: (Break) sequence, which may have significance to the remote
654: system.
655: .It Ic ec
656: Sends the
657: .Dv TELNET EC
658: (Erase Character)
659: sequence, which should cause the remote system to erase the last character
660: entered.
661: .It Ic el
662: Sends the
663: .Dv TELNET EL
664: (Erase Line)
665: sequence, which should cause the remote system to erase the line currently
666: being entered.
667: .It Ic eof
668: Sends the
669: .Dv TELNET EOF
670: (End Of File)
671: sequence.
672: .It Ic eor
673: Sends the
674: .Dv TELNET EOR
675: (End of Record)
676: sequence.
677: .It Ic escape
678: Sends the current
1.22 aaron 679: .Nm
1.12 aaron 680: escape character (initially ``^]'').
1.1 deraadt 681: .It Ic ga
682: Sends the
683: .Dv TELNET GA
684: (Go Ahead)
685: sequence, which likely has no significance to the remote system.
686: .It Ic getstatus
687: If the remote side supports the
688: .Dv TELNET STATUS
689: command,
690: .Ic getstatus
691: will send the subnegotiation to request that the server send
692: its current option status.
693: .It Ic ip
694: Sends the
695: .Dv TELNET IP
696: (Interrupt Process) sequence, which should cause the remote
697: system to abort the currently running process.
698: .It Ic nop
699: Sends the
700: .Dv TELNET NOP
701: (No OPeration)
702: sequence.
703: .It Ic susp
704: Sends the
705: .Dv TELNET SUSP
706: (SUSPend process)
707: sequence.
708: .It Ic synch
709: Sends the
710: .Dv TELNET SYNCH
711: sequence.
712: This sequence causes the remote system to discard all previously typed
713: (but not yet read) input.
714: This sequence is sent as
715: .Tn TCP
716: urgent
717: data (and may not work if the remote system is a
718: .Bx 4.2
719: system -- if
1.12 aaron 720: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 721: .It Ic do Ar cmd
1.12 aaron 722: Sends the
723: .Dv TELNET DO
724: .Ar cmd
725: sequence.
726: .Ar cmd
727: can be either a decimal number between 0 and 255,
728: or a symbolic name for a specific
729: .Dv TELNET
730: command.
731: .Ar cmd
732: can also be either
733: .Ic help
734: or
735: .Ic \&?
736: to print out help information, including
737: a list of known symbolic names.
1.1 deraadt 738: .It Ic dont Ar cmd
1.12 aaron 739: Sends the
740: .Dv TELNET DONT
741: .Ar cmd
742: sequence.
743: .Ar cmd
744: can be either a decimal number between 0 and 255,
745: or a symbolic name for a specific
746: .Dv TELNET
747: command.
748: .Ar cmd
749: can also be either
750: .Ic help
751: or
752: .Ic \&?
753: to print out help information, including
754: a list of known symbolic names.
1.1 deraadt 755: .It Ic will Ar cmd
1.12 aaron 756: Sends the
757: .Dv TELNET WILL
758: .Ar cmd
759: sequence.
760: .Ar cmd
761: can be either a decimal number between 0 and 255,
762: or a symbolic name for a specific
763: .Dv TELNET
764: command.
765: .Ar cmd
766: can also be either
767: .Ic help
768: or
769: .Ic \&?
770: to print out help information, including
771: a list of known symbolic names.
1.1 deraadt 772: .It Ic wont Ar cmd
773: Sends the
1.12 aaron 774: .Dv TELNET WONT
1.1 deraadt 775: .Ar cmd
776: sequence.
1.12 aaron 777: .Ar cmd
1.1 deraadt 778: can be either a decimal number between 0 and 255,
779: or a symbolic name for a specific
780: .Dv TELNET
781: command.
1.12 aaron 782: .Ar cmd
1.1 deraadt 783: can also be either
784: .Ic help
785: or
786: .Ic \&?
787: to print out help information, including
788: a list of known symbolic names.
789: .It Ic \&?
790: Prints out help information for the
791: .Ic send
792: command.
793: .El
1.16 aaron 794: .It Ic set Ar argument value
795: .It Ic unset Ar argument value
1.1 deraadt 796: The
797: .Ic set
798: command will set any one of a number of
1.22 aaron 799: .Nm
1.1 deraadt 800: variables to a specific value or to
801: .Dv TRUE .
802: The special value
803: .Ic off
804: turns off the function associated with
1.12 aaron 805: the variable; this is equivalent to using the
1.1 deraadt 806: .Ic unset
807: command.
808: The
809: .Ic unset
810: command will disable or set to
811: .Dv FALSE
812: any of the specified functions.
813: The values of variables may be interrogated with the
814: .Ic display
815: command.
816: The variables which may be set or unset, but not toggled, are
1.22 aaron 817: listed here.
818: In addition, any of the variables for the
1.1 deraadt 819: .Ic toggle
820: command may be explicitly set or unset using
821: the
822: .Ic set
823: and
824: .Ic unset
825: commands.
826: .Bl -tag -width escape
827: .It Ic ayt
828: If
829: .Tn TELNET
1.12 aaron 830: is in
831: .Ic localchars
832: mode, or
1.1 deraadt 833: .Dv LINEMODE
834: is enabled, and the status character is typed, a
835: .Dv TELNET AYT
836: sequence (see
837: .Ic send ayt
838: preceding) is sent to the
1.22 aaron 839: remote host.
840: The initial value for the "Are You There"
1.1 deraadt 841: character is the terminal's status character.
842: .It Ic echo
1.12 aaron 843: This is the value (initially ``^E'') which, when in
844: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 845: of entered characters (for normal processing), and suppressing
846: echoing of entered characters (for entering, say, a password).
847: .It Ic eof
848: If
1.22 aaron 849: .Nm
1.1 deraadt 850: is operating in
851: .Dv LINEMODE
1.12 aaron 852: or ``old line by line'' mode, entering this character
1.1 deraadt 853: as the first character on a line will cause this character to be
854: sent to the remote system.
1.12 aaron 855: The initial value of the
856: .Ic eof
857: character is taken to be the terminal's
1.1 deraadt 858: .Ic eof
859: character.
860: .It Ic erase
861: If
1.22 aaron 862: .Nm
1.1 deraadt 863: is in
864: .Ic localchars
865: mode (see
866: .Ic toggle
867: .Ic localchars
868: below),
1.12 aaron 869: and if
1.22 aaron 870: .Nm
1.12 aaron 871: is operating in ``character at a time'' mode, then when this
1.1 deraadt 872: character is typed, a
873: .Dv TELNET EC
874: sequence (see
875: .Ic send
876: .Ic ec
877: above)
878: is sent to the remote system.
1.12 aaron 879: The initial value for the
880: .Ic erase
881: character is taken to be
1.1 deraadt 882: the terminal's
883: .Ic erase
884: character.
885: .It Ic escape
886: This is the
1.22 aaron 887: .Nm
1.12 aaron 888: escape character (initially ``^['') which causes entry
1.1 deraadt 889: into
1.22 aaron 890: .Nm
1.1 deraadt 891: command mode (when connected to a remote system).
892: .It Ic flushoutput
893: If
1.22 aaron 894: .Nm
1.1 deraadt 895: is in
896: .Ic localchars
897: mode (see
898: .Ic toggle
899: .Ic localchars
900: below)
901: and the
902: .Ic flushoutput
903: character is typed, a
904: .Dv TELNET AO
905: sequence (see
906: .Ic send
907: .Ic ao
908: above)
909: is sent to the remote host.
1.12 aaron 910: The initial value for the
911: .Ic flush
912: character is taken to be
1.1 deraadt 913: the terminal's
914: .Ic flush
915: character.
916: .It Ic forw1
917: .It Ic forw2
918: If
919: .Tn TELNET
920: is operating in
921: .Dv LINEMODE ,
922: these are the
923: characters that, when typed, cause partial lines to be
1.22 aaron 924: forwarded to the remote system.
925: The initial value for
1.1 deraadt 926: the forwarding characters are taken from the terminal's
927: eol and eol2 characters.
928: .It Ic interrupt
929: If
1.22 aaron 930: .Nm
1.1 deraadt 931: is in
932: .Ic localchars
933: mode (see
934: .Ic toggle
935: .Ic localchars
936: below)
937: and the
938: .Ic interrupt
939: character is typed, a
940: .Dv TELNET IP
941: sequence (see
942: .Ic send
943: .Ic ip
944: above)
945: is sent to the remote host.
1.12 aaron 946: The initial value for the
947: .Ic interrupt
948: character is taken to be
1.1 deraadt 949: the terminal's
950: .Ic intr
951: character.
952: .It Ic kill
953: If
1.22 aaron 954: .Nm
1.1 deraadt 955: is in
956: .Ic localchars
957: mode (see
958: .Ic toggle
959: .Ic localchars
960: below),
1.12 aaron 961: and if
1.22 aaron 962: .Nm
1.12 aaron 963: is operating in ``character at a time'' mode, then when this
1.1 deraadt 964: character is typed, a
965: .Dv TELNET EL
966: sequence (see
967: .Ic send
968: .Ic el
969: above)
970: is sent to the remote system.
1.12 aaron 971: The initial value for the
972: .Ic kill
973: character is taken to be
1.1 deraadt 974: the terminal's
975: .Ic kill
976: character.
977: .It Ic lnext
978: If
1.22 aaron 979: .Nm
1.1 deraadt 980: is operating in
981: .Dv LINEMODE
1.12 aaron 982: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 983: be the terminal's
984: .Ic lnext
985: character.
1.12 aaron 986: The initial value for the
987: .Ic lnext
988: character is taken to be
1.1 deraadt 989: the terminal's
990: .Ic lnext
991: character.
992: .It Ic quit
993: If
1.22 aaron 994: .Nm
1.1 deraadt 995: is in
996: .Ic localchars
997: mode (see
998: .Ic toggle
999: .Ic localchars
1000: below)
1001: and the
1002: .Ic quit
1003: character is typed, a
1004: .Dv TELNET BRK
1005: sequence (see
1006: .Ic send
1007: .Ic brk
1008: above)
1009: is sent to the remote host.
1.12 aaron 1010: The initial value for the
1011: .Ic quit
1012: character is taken to be
1.1 deraadt 1013: the terminal's
1014: .Ic quit
1015: character.
1016: .It Ic reprint
1017: If
1.22 aaron 1018: .Nm
1.1 deraadt 1019: is operating in
1020: .Dv LINEMODE
1.12 aaron 1021: or old line by line'' mode, then this character is taken to
1.1 deraadt 1022: be the terminal's
1023: .Ic reprint
1024: character.
1.12 aaron 1025: The initial value for the
1026: .Ic reprint
1027: character is taken to be
1.1 deraadt 1028: the terminal's
1029: .Ic reprint
1030: character.
1031: .It Ic rlogin
1032: This is the rlogin escape character.
1033: If set, the normal
1034: .Tn TELNET
1035: escape character is ignored unless it is
1036: preceded by this character at the beginning of a line.
1.12 aaron 1037: This character, at the beginning of a line, followed by
1038: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1039: suspends the
1.22 aaron 1040: .Nm
1041: command.
1042: The initial state is to
1.12 aaron 1043: disable the
1044: .Ic rlogin
1045: escape character.
1.1 deraadt 1046: .It Ic start
1047: If the
1048: .Dv TELNET TOGGLE-FLOW-CONTROL
1049: option has been enabled,
1050: then this character is taken to
1051: be the terminal's
1052: .Ic start
1053: character.
1.12 aaron 1054: The initial value for the
1055: .Ic start
1056: character is taken to be
1.1 deraadt 1057: the terminal's
1058: .Ic start
1059: character.
1060: .It Ic stop
1061: If the
1062: .Dv TELNET TOGGLE-FLOW-CONTROL
1063: option has been enabled,
1064: then this character is taken to
1065: be the terminal's
1066: .Ic stop
1067: character.
1.12 aaron 1068: The initial value for the
1069: .Ic stop
1070: character is taken to be
1.1 deraadt 1071: the terminal's
1072: .Ic stop
1073: character.
1074: .It Ic susp
1075: If
1.22 aaron 1076: .Nm
1.1 deraadt 1077: is in
1078: .Ic localchars
1079: mode, or
1080: .Dv LINEMODE
1081: is enabled, and the
1082: .Ic suspend
1083: character is typed, a
1084: .Dv TELNET SUSP
1085: sequence (see
1086: .Ic send
1087: .Ic susp
1088: above)
1089: is sent to the remote host.
1.12 aaron 1090: The initial value for the
1091: .Ic suspend
1092: character is taken to be
1.1 deraadt 1093: the terminal's
1094: .Ic suspend
1095: character.
1096: .It Ic tracefile
1097: This is the file to which the output, caused by
1098: .Ic netdata
1099: or
1100: .Ic option
1101: tracing being
1102: .Dv TRUE ,
1.22 aaron 1103: will be written.
1104: If it is set to
1.1 deraadt 1105: .Dq Fl ,
1106: then tracing information will be written to standard output (the default).
1107: .It Ic worderase
1108: If
1.22 aaron 1109: .Nm
1.1 deraadt 1110: is operating in
1111: .Dv LINEMODE
1.12 aaron 1112: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1113: be the terminal's
1114: .Ic worderase
1115: character.
1.12 aaron 1116: The initial value for the
1117: .Ic worderase
1118: character is taken to be
1.1 deraadt 1119: the terminal's
1120: .Ic worderase
1121: character.
1122: .It Ic \&?
1123: Displays the legal
1124: .Ic set
1125: .Pq Ic unset
1126: commands.
1127: .El
1.17 aaron 1128: .It Ic skey Ar sequence challenge
1129: The
1130: .Ic skey
1.23 aaron 1131: command computes a response to the S/Key challenge.
1132: See
1.17 aaron 1133: .Xr skey 1
1134: for more information on the S/Key system.
1.16 aaron 1135: .It Ic slc Ar state
1.1 deraadt 1136: The
1137: .Ic slc
1138: command (Set Local Characters) is used to set
1.4 deraadt 1139: or change the state of the special
1.16 aaron 1140: characters when the
1.1 deraadt 1141: .Dv TELNET LINEMODE
1142: option has
1.22 aaron 1143: been enabled.
1144: Special characters are characters that get mapped to
1.1 deraadt 1145: .Tn TELNET
1146: commands sequences (like
1147: .Ic ip
1148: or
1.22 aaron 1149: .Ic quit )
1.1 deraadt 1150: or line editing characters (like
1151: .Ic erase
1152: and
1.22 aaron 1153: .Ic kill ) .
1.1 deraadt 1154: By default, the local special characters are exported.
1155: .Bl -tag -width Fl
1156: .It Ic check
1157: Verify the current settings for the current special characters.
1158: The remote side is requested to send all the current special
1159: character settings, and if there are any discrepancies with
1160: the local side, the local side will switch to the remote value.
1161: .It Ic export
1.22 aaron 1162: Switch to the local defaults for the special characters.
1163: The local default characters are those of the local terminal at
1.1 deraadt 1164: the time when
1.22 aaron 1165: .Nm
1.1 deraadt 1166: was started.
1167: .It Ic import
1168: Switch to the remote defaults for the special characters.
1169: The remote default characters are those of the remote system
1.16 aaron 1170: at the time when the
1.1 deraadt 1171: .Tn TELNET
1172: connection was established.
1173: .It Ic \&?
1174: Prints out help information for the
1175: .Ic slc
1176: command.
1177: .El
1178: .It Ic status
1179: Show the current status of
1.12 aaron 1180: .Nm telnet .
1.1 deraadt 1181: This includes the peer one is connected to, as well
1182: as the current mode.
1.16 aaron 1183: .It Ic toggle Ar arguments Op Ar ...
1.1 deraadt 1184: Toggle (between
1185: .Dv TRUE
1186: and
1187: .Dv FALSE )
1188: various flags that control how
1.22 aaron 1189: .Nm
1.1 deraadt 1190: responds to events.
1191: These flags may be set explicitly to
1192: .Dv TRUE
1193: or
1194: .Dv FALSE
1195: using the
1196: .Ic set
1197: and
1198: .Ic unset
1199: commands listed above.
1200: More than one argument may be specified.
1201: The state of these flags may be interrogated with the
1202: .Ic display
1203: command.
1204: Valid arguments are:
1205: .Bl -tag -width Ar
1206: .It Ic authdebug
1207: Turns on debugging information for the authentication code.
1208: .It Ic autoflush
1209: If
1210: .Ic autoflush
1211: and
1212: .Ic localchars
1213: are both
1214: .Dv TRUE ,
1215: then when the
1.12 aaron 1216: .Ic ao
1.1 deraadt 1217: or
1218: .Ic quit
1219: characters are recognized (and transformed into
1220: .Tn TELNET
1221: sequences; see
1222: .Ic set
1223: above for details),
1.22 aaron 1224: .Nm
1.1 deraadt 1225: refuses to display any data on the user's terminal
1226: until the remote system acknowledges (via a
1227: .Dv TELNET TIMING MARK
1228: option)
1229: that it has processed those
1230: .Tn TELNET
1231: sequences.
1232: The initial value for this toggle is
1233: .Dv TRUE
1234: if the terminal user had not
1235: done an "stty noflsh", otherwise
1236: .Dv FALSE
1237: (see
1.22 aaron 1238: .Xr stty 1 ) .
1.1 deraadt 1239: .It Ic autodecrypt
1240: When the
1241: .Dv TELNET ENCRYPT
1242: option is negotiated, by
1243: default the actual encryption (decryption) of the data
1.22 aaron 1244: stream does not start automatically.
1245: The
1.12 aaron 1246: .Ic autoencrypt
1247: .Pq Ic autodecrypt
1248: command states that encryption of the
1.1 deraadt 1249: output (input) stream should be enabled as soon as
1250: possible.
1251: .Pp
1252: .It Ic autologin
1253: If the remote side supports the
1254: .Dv TELNET AUTHENTICATION
1255: option
1256: .Tn TELNET
1.22 aaron 1257: attempts to use it to perform automatic authentication.
1258: If the
1.1 deraadt 1259: .Dv AUTHENTICATION
1260: option is not supported, the user's login
1261: name are propagated through the
1262: .Dv TELNET ENVIRON
1263: option.
1264: This command is the same as specifying
1265: .Ar a
1266: option on the
1267: .Ic open
1268: command.
1269: .It Ic autosynch
1270: If
1271: .Ic autosynch
1272: and
1273: .Ic localchars
1274: are both
1275: .Dv TRUE ,
1276: then when either the
1277: .Ic intr
1278: or
1279: .Ic quit
1.12 aaron 1280: character is typed (see
1.1 deraadt 1281: .Ic set
1282: above for descriptions of the
1283: .Ic intr
1284: and
1285: .Ic quit
1286: characters), the resulting
1287: .Tn TELNET
1288: sequence sent is followed by the
1289: .Dv TELNET SYNCH
1290: sequence.
1291: This procedure
1.12 aaron 1292: .Em should
1.1 deraadt 1293: cause the remote system to begin throwing away all previously
1294: typed input until both of the
1295: .Tn TELNET
1296: sequences have been read and acted upon.
1297: The initial value of this toggle is
1298: .Dv FALSE .
1299: .It Ic binary
1300: Enable or disable the
1301: .Dv TELNET BINARY
1302: option on both input and output.
1303: .It Ic inbinary
1304: Enable or disable the
1305: .Dv TELNET BINARY
1306: option on input.
1307: .It Ic outbinary
1308: Enable or disable the
1309: .Dv TELNET BINARY
1310: option on output.
1311: .It Ic crlf
1312: If this is
1313: .Dv TRUE ,
1314: then carriage returns will be sent as
1315: .Li <CR><LF> .
1316: If this is
1317: .Dv FALSE ,
1318: then carriage returns will be send as
1319: .Li <CR><NUL> .
1320: The initial value for this toggle is
1321: .Dv FALSE .
1322: .It Ic crmod
1323: Toggle carriage return mode.
1324: When this mode is enabled, most carriage return characters received from
1325: the remote host will be mapped into a carriage return followed by
1326: a line feed.
1327: This mode does not affect those characters typed by the user, only
1328: those received from the remote host.
1329: This mode is not very useful unless the remote host
1.12 aaron 1330: only sends carriage return, but never line feeds.
1.1 deraadt 1331: The initial value for this toggle is
1332: .Dv FALSE .
1333: .It Ic debug
1.25 aaron 1334: Toggles socket level debugging (useful only to the superuser).
1.1 deraadt 1335: The initial value for this toggle is
1336: .Dv FALSE .
1337: .It Ic encdebug
1338: Turns on debugging information for the encryption code.
1339: .It Ic localchars
1340: If this is
1341: .Dv TRUE ,
1342: then the
1.12 aaron 1343: .Ic flush ,
1.1 deraadt 1344: .Ic interrupt ,
1.12 aaron 1345: .Ic quit ,
1.1 deraadt 1346: .Ic erase ,
1347: and
1348: .Ic kill
1349: characters (see
1350: .Ic set
1351: above) are recognized locally, and transformed into (hopefully) appropriate
1352: .Tn TELNET
1353: control sequences
1354: (respectively
1.12 aaron 1355: .Ic ao ,
1.1 deraadt 1356: .Ic ip ,
1.12 aaron 1357: .Ic brk ,
1.1 deraadt 1358: .Ic ec ,
1359: and
1.22 aaron 1360: .Ic el ;
1.1 deraadt 1361: see
1362: .Ic send
1363: above).
1364: The initial value for this toggle is
1365: .Dv TRUE
1.12 aaron 1366: in ``old line by line'' mode,
1.1 deraadt 1367: and
1368: .Dv FALSE
1.12 aaron 1369: in ``character at a time'' mode.
1.1 deraadt 1370: When the
1371: .Dv LINEMODE
1372: option is enabled, the value of
1373: .Ic localchars
1374: is ignored, and assumed to always be
1375: .Dv TRUE .
1376: If
1377: .Dv LINEMODE
1378: has ever been enabled, then
1379: .Ic quit
1380: is sent as
1.12 aaron 1381: .Ic abort ,
1382: and
1383: .Ic eof
1.1 deraadt 1384: and
1.5 deraadt 1385: .Ic suspend
1.1 deraadt 1386: are sent as
1.12 aaron 1387: .Ic eof
1388: and
1.5 deraadt 1389: .Ic susp
1390: (see
1.1 deraadt 1391: .Ic send
1392: above).
1393: .It Ic netdata
1394: Toggles the display of all network data (in hexadecimal format).
1395: The initial value for this toggle is
1396: .Dv FALSE .
1397: .It Ic options
1398: Toggles the display of some internal
1.22 aaron 1399: .Nm
1.1 deraadt 1400: protocol processing (having to do with
1401: .Tn TELNET
1402: options).
1403: The initial value for this toggle is
1404: .Dv FALSE .
1405: .It Ic prettydump
1406: When the
1407: .Ic netdata
1408: toggle is enabled, if
1409: .Ic prettydump
1410: is enabled the output from the
1411: .Ic netdata
1412: command will be formatted in a more user readable format.
1413: Spaces are put between each character in the output, and the
1414: beginning of any
1415: .Tn TELNET
1416: escape sequence is preceded by a '*' to aid in locating them.
1417: .It Ic skiprc
1418: When the skiprc toggle is
1419: .Dv TRUE ,
1420: .Tn TELNET
1421: skips the reading of the
1422: .Pa \&.telnetrc
1.12 aaron 1423: file in the user's home
1.22 aaron 1424: directory when connections are opened.
1425: The initial value for this toggle is
1.13 aaron 1426: .Dv FALSE .
1.1 deraadt 1427: .It Ic termdata
1428: Toggles the display of all terminal data (in hexadecimal format).
1429: The initial value for this toggle is
1430: .Dv FALSE .
1431: .It Ic verbose_encrypt
1432: When the
1433: .Ic verbose_encrypt
1434: toggle is
1435: .Dv TRUE ,
1.22 aaron 1436: .Nm
1.1 deraadt 1437: prints out a message each time encryption is enabled or
1.22 aaron 1438: disabled.
1439: The initial value for this toggle is
1.13 aaron 1440: .Dv FALSE .
1.1 deraadt 1441: .It Ic \&?
1442: Displays the legal
1443: .Ic toggle
1444: commands.
1445: .El
1446: .It Ic z
1447: Suspend
1.12 aaron 1448: .Nm telnet .
1.1 deraadt 1449: This command only works when the user is using the
1.12 aaron 1450: .Xr csh 1 .
1.16 aaron 1451: .It Ic \&! Op Ar command
1.1 deraadt 1452: Execute a single command in a subshell on the local
1.22 aaron 1453: system.
1454: If
1.5 deraadt 1455: .Ar command
1.1 deraadt 1456: is omitted, then an interactive
1457: subshell is invoked.
1.16 aaron 1458: .It Ic \&? Op Ar command
1.22 aaron 1459: Get help.
1460: With no arguments,
1461: .Nm
1.1 deraadt 1462: prints a help summary.
1463: If a command is specified,
1.22 aaron 1464: .Nm
1.1 deraadt 1465: will print the help information for just that command.
1466: .El
1467: .Sh ENVIRONMENT
1.22 aaron 1468: .Nm
1.1 deraadt 1469: uses at least the
1470: .Ev HOME ,
1471: .Ev SHELL ,
1472: .Ev DISPLAY ,
1473: and
1474: .Ev TERM
1475: environment variables.
1476: Other environment variables may be propagated
1477: to the other side via the
1478: .Dv TELNET ENVIRON
1479: option.
1480: .Sh FILES
1481: .Bl -tag -width ~/.telnetrc -compact
1482: .It Pa ~/.telnetrc
1483: user customized telnet startup values
1484: .El
1485: .Sh HISTORY
1486: The
1.22 aaron 1487: .Nm
1.1 deraadt 1488: command appeared in
1489: .Bx 4.2 .
1490: .Sh NOTES
1491: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1492: ``old line by line'' mode.
1.1 deraadt 1493: .Pp
1.16 aaron 1494: In ``old line by line'' mode or
1.1 deraadt 1495: .Dv LINEMODE
1496: the terminal's
1497: .Ic eof
1498: character is only recognized (and sent to the remote system)
1499: when it is the first character on a line.
1.20 itojun 1500: .Pp
1501: Source routing is not supported yet for IPv6.
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