Annotation of src/usr.bin/telnet/telnet.1, Revision 1.31
1.31 ! deraadt 1: .\" $OpenBSD: telnet.1,v 1.30 2002/05/06 23:34:33 millert 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
1.31 ! deraadt 47: .Bk -words
1.26 aaron 48: .Op Fl 8EFKLacdfrx
1.1 deraadt 49: .Op Fl X Ar authtype
1.3 niklas 50: .Op Fl b Ar hostalias
1.1 deraadt 51: .Op Fl e Ar escapechar
52: .Op Fl k Ar realm
53: .Op Fl l Ar user
54: .Op Fl n Ar tracefile
55: .Oo
56: .Ar host
1.9 deraadt 57: .Op Ar port
1.1 deraadt 58: .Oc
1.31 ! deraadt 59: .Ek
1.1 deraadt 60: .Sh DESCRIPTION
61: The
1.22 aaron 62: .Nm
1.1 deraadt 63: command
1.16 aaron 64: is used to communicate with another host using the
1.1 deraadt 65: .Tn TELNET
66: protocol.
67: If
1.22 aaron 68: .Nm
1.1 deraadt 69: is invoked without the
70: .Ar host
71: argument, it enters command mode,
72: indicated by its prompt
73: .Pq Nm telnet\&> .
74: In this mode, it accepts and executes the commands listed below.
75: If it is invoked with arguments, it performs an
76: .Ic open
77: command with those arguments.
78: .Pp
1.19 aaron 79: The options are as follows:
1.27 aaron 80: .Bl -tag -width Ds
1.1 deraadt 81: .It Fl 8
1.22 aaron 82: Specifies an 8-bit data path.
83: This causes an attempt to negotiate the
1.1 deraadt 84: .Dv TELNET BINARY
85: option on both input and output.
86: .It Fl E
87: Stops any character from being recognized as an escape character.
88: .It Fl F
1.28 hin 89: If Kerberos 5 authentication is being used, the
1.1 deraadt 90: .Fl F
91: option allows the local credentials to be forwarded
92: to the remote system, including any credentials that
93: have already been forwarded into the local environment.
94: .It Fl K
95: Specifies no automatic login to the remote system.
96: .It Fl L
1.22 aaron 97: Specifies an 8-bit data path on output.
98: This causes the BINARY option to be negotiated on output.
1.16 aaron 99: .It Fl X Ar atype
1.1 deraadt 100: Disables the
101: .Ar atype
102: type of authentication.
103: .It Fl a
104: Attempt automatic login.
105: Currently, this sends the user name via the
106: .Ev USER
107: variable
108: of the
109: .Ev ENVIRON
110: option if supported by the remote system.
111: The name used is that of the current user as returned by
112: .Xr getlogin 2
113: if it agrees with the current user ID,
114: otherwise it is the name associated with the user ID.
1.3 niklas 115: .It Fl b Ar hostalias
116: Uses
117: .Xr bind 2
1.12 aaron 118: on the local socket to bind it to an aliased address (see
1.3 niklas 119: .Xr ifconfig 8
1.12 aaron 120: and the ``alias'' specifier) or to the address of
1.3 niklas 121: another interface than the one naturally chosen by
122: .Xr connect 2 .
1.12 aaron 123: This can be useful when connecting to services which use IP addresses
1.3 niklas 124: for authentication and reconfiguration of the server is undesirable (or
125: impossible).
1.1 deraadt 126: .It Fl c
127: Disables the reading of the user's
128: .Pa \&.telnetrc
1.22 aaron 129: file.
130: (See the
1.1 deraadt 131: .Ic toggle skiprc
132: command on this man page.)
133: .It Fl d
134: Sets the initial value of the
135: .Ic debug
136: toggle to
1.12 aaron 137: .Dv TRUE .
1.16 aaron 138: .It Fl e Ar escapechar
1.1 deraadt 139: Sets the initial
140: .Nm
141: escape character to
1.9 deraadt 142: .Ar escapechar Ns .
1.1 deraadt 143: If
1.8 deraadt 144: .Ar escapechar
1.1 deraadt 145: is omitted, then
146: there will be no escape character.
147: .It Fl f
1.28 hin 148: If Kerberos 5 authentication is being used, the
1.1 deraadt 149: .Fl f
150: option allows the local credentials to be forwarded to the remote system.
151: .It Fl k Ar realm
152: If Kerberos authentication is being used, the
153: .Fl k
1.12 aaron 154: option requests that
1.22 aaron 155: .Nm
1.12 aaron 156: obtain tickets for the remote host in
1.8 deraadt 157: realm
158: .Ar realm
159: instead of the remote host's realm, as determined
1.1 deraadt 160: by
161: .Xr krb_realmofhost 3 .
1.16 aaron 162: .It Fl l Ar user
1.1 deraadt 163: When connecting to the remote system, if the remote system
164: understands the
165: .Ev ENVIRON
166: option, then
167: .Ar user
168: will be sent to the remote system as the value for the variable USER.
169: This option implies the
170: .Fl a
171: option.
172: This option may also be used with the
173: .Ic open
174: command.
1.16 aaron 175: .It Fl n Ar tracefile
1.1 deraadt 176: Opens
177: .Ar tracefile
178: for recording trace information.
179: See the
180: .Ic set tracefile
181: command below.
182: .It Fl r
183: Specifies a user interface similar to
1.30 millert 184: .Nm rlogin .
1.1 deraadt 185: In this
186: mode, the escape character is set to the tilde (~) character,
1.8 deraadt 187: unless modified by the
188: .Fl e
189: option.
1.1 deraadt 190: .It Fl x
1.29 hin 191: Turn on encryption of the data stream. When this option is turned on,
192: .Nm
193: will exit with an error if authentication cannot be negotiated or if
194: encryption cannot be turned on.
1.1 deraadt 195: .It Ar host
196: Indicates the official name, an alias, or the Internet address
197: of a remote host.
198: .It Ar port
1.22 aaron 199: Indicates a port number (address of an application).
200: If a number is not specified, the default
201: .Nm
1.1 deraadt 202: port is used.
203: .El
204: .Pp
1.22 aaron 205: When in rlogin mode, a line of the form ~.
206: disconnects from the
1.1 deraadt 207: remote host; ~ is the telnet escape character.
208: Similarly, the line ~^Z suspends the telnet session.
209: The line ~^] escapes to the normal telnet escape prompt.
210: .Pp
211: Once a connection has been opened,
1.22 aaron 212: .Nm
1.1 deraadt 213: will attempt to enable the
214: .Dv TELNET LINEMODE
215: option.
1.12 aaron 216: If this fails,
1.22 aaron 217: .Nm
1.1 deraadt 218: will revert to one of two input modes:
1.12 aaron 219: either ``character at a time''
220: or ``old line by line''
1.1 deraadt 221: depending on what the remote system supports.
222: .Pp
1.16 aaron 223: When
1.1 deraadt 224: .Dv LINEMODE
225: is enabled, character processing is done on the
1.22 aaron 226: local system, under the control of the remote system.
227: When input
1.1 deraadt 228: editing or character echoing is to be disabled, the remote system
1.22 aaron 229: will relay that information.
230: The remote system will also relay
1.1 deraadt 231: changes to any special characters that happen on the remote
232: system, so that they can take effect on the local system.
233: .Pp
1.12 aaron 234: In ``character at a time'' mode, most
1.1 deraadt 235: text typed is immediately sent to the remote host for processing.
236: .Pp
1.12 aaron 237: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 238: and (normally) only completed lines are sent to the remote host.
1.12 aaron 239: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 240: to turn off and on the local echo
241: (this would mostly be used to enter passwords
242: without the password being echoed).
243: .Pp
1.16 aaron 244: If the
1.1 deraadt 245: .Dv LINEMODE
246: option is enabled, or if the
247: .Ic localchars
248: toggle is
249: .Dv TRUE
1.12 aaron 250: (the default for ``old line by line''; see below),
1.1 deraadt 251: the user's
1.12 aaron 252: .Ic quit ,
1.1 deraadt 253: .Ic intr ,
254: and
255: .Ic flush
256: characters are trapped locally, and sent as
257: .Tn TELNET
258: protocol sequences to the remote side.
1.16 aaron 259: If
1.1 deraadt 260: .Dv LINEMODE
261: has ever been enabled, then the user's
262: .Ic susp
263: and
264: .Ic eof
265: are also sent as
266: .Tn TELNET
267: protocol sequences,
268: and
269: .Ic quit
1.16 aaron 270: is sent as a
1.1 deraadt 271: .Dv TELNET ABORT
1.16 aaron 272: instead of
1.8 deraadt 273: .Dv BREAK .
1.1 deraadt 274: There are options (see
275: .Ic toggle
276: .Ic autoflush
277: and
278: .Ic toggle
279: .Ic autosynch
280: below)
281: which cause this action to flush subsequent output to the terminal
282: (until the remote host acknowledges the
283: .Tn TELNET
284: sequence) and flush previous terminal input
285: (in the case of
286: .Ic quit
287: and
1.22 aaron 288: .Ic intr ) .
1.1 deraadt 289: .Pp
290: While connected to a remote host,
1.22 aaron 291: .Nm
1.1 deraadt 292: command mode may be entered by typing the
1.22 aaron 293: .Nm
1.12 aaron 294: ``escape character'' (initially ``^]'').
1.1 deraadt 295: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 296: Note that the escape character will return to the command mode of the initial
1.18 alex 297: invocation of
1.22 aaron 298: .Nm
1.23 aaron 299: that has the controlling terminal.
300: Use the
1.15 aaron 301: .Cm send escape
302: command to switch to command mode in subsequent
1.22 aaron 303: .Nm
1.15 aaron 304: processes on remote hosts.
1.1 deraadt 305: .Pp
306: The following
1.22 aaron 307: .Nm
1.1 deraadt 308: commands are available.
309: Only enough of each command to uniquely identify it need be typed
310: (this is also true for arguments to the
1.12 aaron 311: .Ic mode ,
1.1 deraadt 312: .Ic set ,
1.12 aaron 313: .Ic toggle ,
1.1 deraadt 314: .Ic unset ,
1.12 aaron 315: .Ic slc ,
1.1 deraadt 316: .Ic environ ,
317: and
318: .Ic display
319: commands).
320: .Bl -tag -width "mode type"
1.16 aaron 321: .It Ic auth Ar argument Op Ar ...
1.12 aaron 322: The
323: .Ic auth
324: command manipulates the information sent through the
1.1 deraadt 325: .Dv TELNET AUTHENTICATE
1.22 aaron 326: option.
327: Valid arguments for the
328: .Ic auth
329: command are as follows:
1.1 deraadt 330: .Bl -tag -width "disable type"
331: .It Ic disable Ar type
1.12 aaron 332: Disables the specified
333: .Ar type
1.22 aaron 334: of authentication.
335: To obtain a list of available types, use the
1.1 deraadt 336: .Ic auth disable \&?
337: command.
338: .It Ic enable Ar type
1.12 aaron 339: Enables the specified
340: .Ar type
1.22 aaron 341: of authentication.
342: To obtain a list of available types, use the
1.1 deraadt 343: .Ic auth enable \&?
344: command.
345: .It Ic status
346: Lists the current status of the various types of
347: authentication.
348: .El
349: .It Ic close
350: Close a
351: .Tn TELNET
352: session and return to command mode.
1.16 aaron 353: .It Ic display Ar argument Op Ar ...
1.1 deraadt 354: Displays all, or some, of the
355: .Ic set
356: and
357: .Ic toggle
358: values (see below).
1.12 aaron 359: .It Ic encrypt Ar argument Op Ar ...
360: The
361: .Ic encrypt
362: command manipulates the information sent through the
1.1 deraadt 363: .Dv TELNET ENCRYPT
1.28 hin 364: option that's available when Kerberos is used.
1.14 aaron 365: .Pp
1.1 deraadt 366: Valid arguments for the encrypt command are as follows:
367: .Bl -tag -width Ar
368: .It Ic disable Ar type Ic [input|output]
1.12 aaron 369: Disables the specified
370: .Ar type
1.22 aaron 371: of encryption.
372: If you omit
1.12 aaron 373: .Ic input
374: and
375: .Ic output ,
376: both input and output
1.22 aaron 377: are disabled.
378: To obtain a list of available types, use the
1.1 deraadt 379: .Ic encrypt disable \&?
380: command.
381: .It Ic enable Ar type Ic [input|output]
1.12 aaron 382: Enables the specified
383: .Ar type
1.22 aaron 384: of encryption.
385: If you omit
1.12 aaron 386: .Ic input
387: and
388: .Ic output ,
389: both input and output are
1.22 aaron 390: enabled.
391: To obtain a list of available types, use the
1.1 deraadt 392: .Ic encrypt enable \&?
393: command.
394: .It Ic input
395: This is the same as the
396: .Ic encrypt start input
397: command.
398: .It Ic -input
399: This is the same as the
400: .Ic encrypt stop input
401: command.
402: .It Ic output
403: This is the same as the
404: .Ic encrypt start output
405: command.
406: .It Ic -output
407: This is the same as the
408: .Ic encrypt stop output
409: command.
410: .It Ic start Ic [input|output]
1.22 aaron 411: Attempts to start encryption.
412: If you omit
1.1 deraadt 413: .Ic input
414: and
1.24 aaron 415: .Ic output ,
1.22 aaron 416: both input and output are enabled.
417: To obtain a list of available types, use the
1.1 deraadt 418: .Ic encrypt enable \&?
419: command.
420: .It Ic status
421: Lists the current status of encryption.
422: .It Ic stop Ic [input|output]
1.22 aaron 423: Stops encryption.
424: If you omit
1.12 aaron 425: .Ic input
426: and
427: .Ic output ,
1.1 deraadt 428: encryption is on both input and output.
429: .It Ic type Ar type
430: Sets the default type of encryption to be used
431: with later
432: .Ic encrypt start
433: or
434: .Ic encrypt stop
435: commands.
436: .El
1.16 aaron 437: .It Ic environ Ar arguments Op Ar ...
1.1 deraadt 438: The
439: .Ic environ
440: command is used to manipulate the
1.11 deraadt 441: variables that may be sent through the
1.1 deraadt 442: .Dv TELNET ENVIRON
443: option.
444: The initial set of variables is taken from the users
445: environment, with only the
446: .Ev DISPLAY
447: and
448: .Ev PRINTER
449: variables being exported by default.
450: The
451: .Ev USER
452: variable is also exported if the
453: .Fl a
454: or
455: .Fl l
456: options are used.
457: .br
458: Valid arguments for the
459: .Ic environ
460: command are:
461: .Bl -tag -width Fl
1.16 aaron 462: .It Ic define Ar variable value
1.1 deraadt 463: Define the variable
464: .Ar variable
465: to have a value of
1.12 aaron 466: .Ar value .
1.1 deraadt 467: Any variables defined by this command are automatically exported.
468: The
469: .Ar value
470: may be enclosed in single or double quotes so
471: that tabs and spaces may be included.
1.16 aaron 472: .It Ic undefine Ar variable
1.1 deraadt 473: Remove
474: .Ar variable
475: from the list of environment variables.
1.16 aaron 476: .It Ic export Ar variable
1.1 deraadt 477: Mark the variable
478: .Ar variable
479: to be exported to the remote side.
1.16 aaron 480: .It Ic unexport Ar variable
1.1 deraadt 481: Mark the variable
482: .Ar variable
483: to not be exported unless
484: explicitly asked for by the remote side.
485: .It Ic list
486: List the current set of environment variables.
487: Those marked with a
488: .Cm *
489: will be sent automatically,
490: other variables will only be sent if explicitly requested.
491: .It Ic \&?
492: Prints out help information for the
493: .Ic environ
494: command.
495: .El
496: .It Ic logout
497: Sends the
498: .Dv TELNET LOGOUT
499: option to the remote side.
500: This command is similar to a
501: .Ic close
502: command; however, if the remote side does not support the
503: .Dv LOGOUT
504: option, nothing happens.
505: If, however, the remote side does support the
506: .Dv LOGOUT
507: option, this command should cause the remote side to close the
508: .Tn TELNET
509: connection.
510: If the remote side also supports the concept of
511: suspending a user's session for later reattachment,
512: the logout argument indicates that you
513: should terminate the session immediately.
1.16 aaron 514: .It Ic mode Ar type
1.12 aaron 515: .Ar type
1.1 deraadt 516: is one of several options, depending on the state of the
517: .Tn TELNET
518: session.
519: The remote host is asked for permission to go into the requested mode.
520: If the remote host is capable of entering that mode, the requested
521: mode will be entered.
522: .Bl -tag -width Ar
523: .It Ic character
524: Disable the
525: .Dv TELNET LINEMODE
526: option, or, if the remote side does not understand the
527: .Dv LINEMODE
1.12 aaron 528: option, then enter ``character at a time'' mode.
1.1 deraadt 529: .It Ic line
530: Enable the
531: .Dv TELNET LINEMODE
532: option, or, if the remote side does not understand the
533: .Dv LINEMODE
1.12 aaron 534: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 535: .It Ic isig Pq Ic \-isig
536: Attempt to enable (disable) the
1.1 deraadt 537: .Dv TRAPSIG
1.16 aaron 538: mode of the
1.1 deraadt 539: .Dv LINEMODE
540: option.
1.16 aaron 541: This requires that the
1.1 deraadt 542: .Dv LINEMODE
543: option be enabled.
1.16 aaron 544: .It Ic edit Pq Ic \-edit
545: Attempt to enable (disable) the
1.1 deraadt 546: .Dv EDIT
1.16 aaron 547: mode of the
1.1 deraadt 548: .Dv LINEMODE
549: option.
1.16 aaron 550: This requires that the
1.1 deraadt 551: .Dv LINEMODE
552: option be enabled.
1.16 aaron 553: .It Ic softtabs Pq Ic \-softtabs
554: Attempt to enable (disable) the
1.1 deraadt 555: .Dv SOFT_TAB
1.16 aaron 556: mode of the
1.1 deraadt 557: .Dv LINEMODE
558: option.
1.16 aaron 559: This requires that the
1.1 deraadt 560: .Dv LINEMODE
561: option be enabled.
1.16 aaron 562: .It Ic litecho Pq Ic \-litecho
563: Attempt to enable (disable) the
1.1 deraadt 564: .Dv LIT_ECHO
1.16 aaron 565: mode of the
1.1 deraadt 566: .Dv LINEMODE
567: option.
1.16 aaron 568: This requires that the
1.1 deraadt 569: .Dv LINEMODE
570: option be enabled.
571: .It Ic \&?
572: Prints out help information for the
573: .Ic mode
574: command.
575: .El
576: .It Xo
577: .Ic open Ar host
1.5 deraadt 578: .Op Fl l Ar user
579: .Oo Op Fl
1.1 deraadt 580: .Ar port Oc
581: .Xc
582: Open a connection to the named host.
583: If no port number
584: is specified,
1.22 aaron 585: .Nm
1.1 deraadt 586: will attempt to contact a
587: .Tn TELNET
588: server at the default port.
589: The host specification may be either a host name (see
1.7 deraadt 590: .Xr hosts 5 )
1.12 aaron 591: or an Internet address specified in the ``dot notation'' (see
1.1 deraadt 592: .Xr inet 3 ) .
593: The
1.5 deraadt 594: .Fl l
1.1 deraadt 595: option may be used to specify the user name
596: to be passed to the remote system via the
597: .Ev ENVIRON
598: option.
599: When connecting to a non-standard port,
1.22 aaron 600: .Nm
1.1 deraadt 601: omits any automatic initiation of
602: .Tn TELNET
1.22 aaron 603: options.
604: When the port number is preceded by a minus sign,
1.1 deraadt 605: the initial option negotiation is done.
606: After establishing a connection, the file
607: .Pa \&.telnetrc
608: in the
1.22 aaron 609: user's home directory is opened.
610: Lines beginning with a ``#'' are
611: comment lines.
612: Blank lines are ignored.
613: Lines that begin
614: without whitespace are the start of a machine entry.
615: The first thing on the line is the name of the machine that is
616: being connected to.
617: The rest of the line, and successive
1.21 aaron 618: lines that begin with whitespace are assumed to be
1.22 aaron 619: .Nm
1.1 deraadt 620: commands and are processed as if they had been typed
621: in manually to the
1.22 aaron 622: .Nm
1.1 deraadt 623: command prompt.
624: .It Ic quit
625: Close any open
626: .Tn TELNET
627: session and exit
1.12 aaron 628: .Nm telnet .
629: An end-of-file (in command mode) will also close a session and exit.
1.16 aaron 630: .It Ic send Ar arguments
1.1 deraadt 631: Sends one or more special character sequences to the remote host.
632: The following are the arguments which may be specified
633: (more than one argument may be specified at a time):
634: .Bl -tag -width escape
635: .It Ic abort
636: Sends the
637: .Dv TELNET ABORT
638: (Abort
639: processes)
640: sequence.
641: .It Ic ao
642: Sends the
643: .Dv TELNET AO
644: (Abort Output) sequence, which should cause the remote system to flush
645: all output
646: .Em from
647: the remote system
648: .Em to
649: the user's terminal.
650: .It Ic ayt
651: Sends the
652: .Dv TELNET AYT
653: (Are You There)
654: sequence, to which the remote system may or may not choose to respond.
655: .It Ic brk
656: Sends the
657: .Dv TELNET BRK
658: (Break) sequence, which may have significance to the remote
659: system.
660: .It Ic ec
661: Sends the
662: .Dv TELNET EC
663: (Erase Character)
664: sequence, which should cause the remote system to erase the last character
665: entered.
666: .It Ic el
667: Sends the
668: .Dv TELNET EL
669: (Erase Line)
670: sequence, which should cause the remote system to erase the line currently
671: being entered.
672: .It Ic eof
673: Sends the
674: .Dv TELNET EOF
675: (End Of File)
676: sequence.
677: .It Ic eor
678: Sends the
679: .Dv TELNET EOR
680: (End of Record)
681: sequence.
682: .It Ic escape
683: Sends the current
1.22 aaron 684: .Nm
1.12 aaron 685: escape character (initially ``^]'').
1.1 deraadt 686: .It Ic ga
687: Sends the
688: .Dv TELNET GA
689: (Go Ahead)
690: sequence, which likely has no significance to the remote system.
691: .It Ic getstatus
692: If the remote side supports the
693: .Dv TELNET STATUS
694: command,
695: .Ic getstatus
696: will send the subnegotiation to request that the server send
697: its current option status.
698: .It Ic ip
699: Sends the
700: .Dv TELNET IP
701: (Interrupt Process) sequence, which should cause the remote
702: system to abort the currently running process.
703: .It Ic nop
704: Sends the
705: .Dv TELNET NOP
706: (No OPeration)
707: sequence.
708: .It Ic susp
709: Sends the
710: .Dv TELNET SUSP
711: (SUSPend process)
712: sequence.
713: .It Ic synch
714: Sends the
715: .Dv TELNET SYNCH
716: sequence.
717: This sequence causes the remote system to discard all previously typed
718: (but not yet read) input.
719: This sequence is sent as
720: .Tn TCP
721: urgent
722: data (and may not work if the remote system is a
723: .Bx 4.2
724: system -- if
1.12 aaron 725: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 726: .It Ic do Ar cmd
1.12 aaron 727: Sends the
728: .Dv TELNET DO
729: .Ar cmd
730: sequence.
731: .Ar cmd
732: can be either a decimal number between 0 and 255,
733: or a symbolic name for a specific
734: .Dv TELNET
735: command.
736: .Ar cmd
737: can also be either
738: .Ic help
739: or
740: .Ic \&?
741: to print out help information, including
742: a list of known symbolic names.
1.1 deraadt 743: .It Ic dont Ar cmd
1.12 aaron 744: Sends the
745: .Dv TELNET DONT
746: .Ar cmd
747: sequence.
748: .Ar cmd
749: can be either a decimal number between 0 and 255,
750: or a symbolic name for a specific
751: .Dv TELNET
752: command.
753: .Ar cmd
754: can also be either
755: .Ic help
756: or
757: .Ic \&?
758: to print out help information, including
759: a list of known symbolic names.
1.1 deraadt 760: .It Ic will Ar cmd
1.12 aaron 761: Sends the
762: .Dv TELNET WILL
763: .Ar cmd
764: sequence.
765: .Ar cmd
766: can be either a decimal number between 0 and 255,
767: or a symbolic name for a specific
768: .Dv TELNET
769: command.
770: .Ar cmd
771: can also be either
772: .Ic help
773: or
774: .Ic \&?
775: to print out help information, including
776: a list of known symbolic names.
1.1 deraadt 777: .It Ic wont Ar cmd
778: Sends the
1.12 aaron 779: .Dv TELNET WONT
1.1 deraadt 780: .Ar cmd
781: sequence.
1.12 aaron 782: .Ar cmd
1.1 deraadt 783: can be either a decimal number between 0 and 255,
784: or a symbolic name for a specific
785: .Dv TELNET
786: command.
1.12 aaron 787: .Ar cmd
1.1 deraadt 788: can also be either
789: .Ic help
790: or
791: .Ic \&?
792: to print out help information, including
793: a list of known symbolic names.
794: .It Ic \&?
795: Prints out help information for the
796: .Ic send
797: command.
798: .El
1.16 aaron 799: .It Ic set Ar argument value
800: .It Ic unset Ar argument value
1.1 deraadt 801: The
802: .Ic set
803: command will set any one of a number of
1.22 aaron 804: .Nm
1.1 deraadt 805: variables to a specific value or to
806: .Dv TRUE .
807: The special value
808: .Ic off
809: turns off the function associated with
1.12 aaron 810: the variable; this is equivalent to using the
1.1 deraadt 811: .Ic unset
812: command.
813: The
814: .Ic unset
815: command will disable or set to
816: .Dv FALSE
817: any of the specified functions.
818: The values of variables may be interrogated with the
819: .Ic display
820: command.
821: The variables which may be set or unset, but not toggled, are
1.22 aaron 822: listed here.
823: In addition, any of the variables for the
1.1 deraadt 824: .Ic toggle
825: command may be explicitly set or unset using
826: the
827: .Ic set
828: and
829: .Ic unset
830: commands.
831: .Bl -tag -width escape
832: .It Ic ayt
833: If
834: .Tn TELNET
1.12 aaron 835: is in
836: .Ic localchars
837: mode, or
1.1 deraadt 838: .Dv LINEMODE
839: is enabled, and the status character is typed, a
840: .Dv TELNET AYT
841: sequence (see
842: .Ic send ayt
843: preceding) is sent to the
1.22 aaron 844: remote host.
845: The initial value for the "Are You There"
1.1 deraadt 846: character is the terminal's status character.
847: .It Ic echo
1.12 aaron 848: This is the value (initially ``^E'') which, when in
849: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 850: of entered characters (for normal processing), and suppressing
851: echoing of entered characters (for entering, say, a password).
852: .It Ic eof
853: If
1.22 aaron 854: .Nm
1.1 deraadt 855: is operating in
856: .Dv LINEMODE
1.12 aaron 857: or ``old line by line'' mode, entering this character
1.1 deraadt 858: as the first character on a line will cause this character to be
859: sent to the remote system.
1.12 aaron 860: The initial value of the
861: .Ic eof
862: character is taken to be the terminal's
1.1 deraadt 863: .Ic eof
864: character.
865: .It Ic erase
866: If
1.22 aaron 867: .Nm
1.1 deraadt 868: is in
869: .Ic localchars
870: mode (see
871: .Ic toggle
872: .Ic localchars
873: below),
1.12 aaron 874: and if
1.22 aaron 875: .Nm
1.12 aaron 876: is operating in ``character at a time'' mode, then when this
1.1 deraadt 877: character is typed, a
878: .Dv TELNET EC
879: sequence (see
880: .Ic send
881: .Ic ec
882: above)
883: is sent to the remote system.
1.12 aaron 884: The initial value for the
885: .Ic erase
886: character is taken to be
1.1 deraadt 887: the terminal's
888: .Ic erase
889: character.
890: .It Ic escape
891: This is the
1.22 aaron 892: .Nm
1.12 aaron 893: escape character (initially ``^['') which causes entry
1.1 deraadt 894: into
1.22 aaron 895: .Nm
1.1 deraadt 896: command mode (when connected to a remote system).
897: .It Ic flushoutput
898: If
1.22 aaron 899: .Nm
1.1 deraadt 900: is in
901: .Ic localchars
902: mode (see
903: .Ic toggle
904: .Ic localchars
905: below)
906: and the
907: .Ic flushoutput
908: character is typed, a
909: .Dv TELNET AO
910: sequence (see
911: .Ic send
912: .Ic ao
913: above)
914: is sent to the remote host.
1.12 aaron 915: The initial value for the
916: .Ic flush
917: character is taken to be
1.1 deraadt 918: the terminal's
919: .Ic flush
920: character.
921: .It Ic forw1
922: .It Ic forw2
923: If
924: .Tn TELNET
925: is operating in
926: .Dv LINEMODE ,
927: these are the
928: characters that, when typed, cause partial lines to be
1.22 aaron 929: forwarded to the remote system.
930: The initial value for
1.1 deraadt 931: the forwarding characters are taken from the terminal's
932: eol and eol2 characters.
933: .It Ic interrupt
934: If
1.22 aaron 935: .Nm
1.1 deraadt 936: is in
937: .Ic localchars
938: mode (see
939: .Ic toggle
940: .Ic localchars
941: below)
942: and the
943: .Ic interrupt
944: character is typed, a
945: .Dv TELNET IP
946: sequence (see
947: .Ic send
948: .Ic ip
949: above)
950: is sent to the remote host.
1.12 aaron 951: The initial value for the
952: .Ic interrupt
953: character is taken to be
1.1 deraadt 954: the terminal's
955: .Ic intr
956: character.
957: .It Ic kill
958: If
1.22 aaron 959: .Nm
1.1 deraadt 960: is in
961: .Ic localchars
962: mode (see
963: .Ic toggle
964: .Ic localchars
965: below),
1.12 aaron 966: and if
1.22 aaron 967: .Nm
1.12 aaron 968: is operating in ``character at a time'' mode, then when this
1.1 deraadt 969: character is typed, a
970: .Dv TELNET EL
971: sequence (see
972: .Ic send
973: .Ic el
974: above)
975: is sent to the remote system.
1.12 aaron 976: The initial value for the
977: .Ic kill
978: character is taken to be
1.1 deraadt 979: the terminal's
980: .Ic kill
981: character.
982: .It Ic lnext
983: If
1.22 aaron 984: .Nm
1.1 deraadt 985: is operating in
986: .Dv LINEMODE
1.12 aaron 987: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 988: be the terminal's
989: .Ic lnext
990: character.
1.12 aaron 991: The initial value for the
992: .Ic lnext
993: character is taken to be
1.1 deraadt 994: the terminal's
995: .Ic lnext
996: character.
997: .It Ic quit
998: If
1.22 aaron 999: .Nm
1.1 deraadt 1000: is in
1001: .Ic localchars
1002: mode (see
1003: .Ic toggle
1004: .Ic localchars
1005: below)
1006: and the
1007: .Ic quit
1008: character is typed, a
1009: .Dv TELNET BRK
1010: sequence (see
1011: .Ic send
1012: .Ic brk
1013: above)
1014: is sent to the remote host.
1.12 aaron 1015: The initial value for the
1016: .Ic quit
1017: character is taken to be
1.1 deraadt 1018: the terminal's
1019: .Ic quit
1020: character.
1021: .It Ic reprint
1022: If
1.22 aaron 1023: .Nm
1.1 deraadt 1024: is operating in
1025: .Dv LINEMODE
1.31 ! deraadt 1026: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1027: be the terminal's
1028: .Ic reprint
1029: character.
1.12 aaron 1030: The initial value for the
1031: .Ic reprint
1032: character is taken to be
1.1 deraadt 1033: the terminal's
1034: .Ic reprint
1035: character.
1036: .It Ic rlogin
1037: This is the rlogin escape character.
1038: If set, the normal
1039: .Tn TELNET
1040: escape character is ignored unless it is
1041: preceded by this character at the beginning of a line.
1.12 aaron 1042: This character, at the beginning of a line, followed by
1043: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1044: suspends the
1.22 aaron 1045: .Nm
1046: command.
1047: The initial state is to
1.12 aaron 1048: disable the
1049: .Ic rlogin
1050: escape character.
1.1 deraadt 1051: .It Ic start
1052: If the
1053: .Dv TELNET TOGGLE-FLOW-CONTROL
1054: option has been enabled,
1055: then this character is taken to
1056: be the terminal's
1057: .Ic start
1058: character.
1.12 aaron 1059: The initial value for the
1060: .Ic start
1061: character is taken to be
1.1 deraadt 1062: the terminal's
1063: .Ic start
1064: character.
1065: .It Ic stop
1066: If the
1067: .Dv TELNET TOGGLE-FLOW-CONTROL
1068: option has been enabled,
1069: then this character is taken to
1070: be the terminal's
1071: .Ic stop
1072: character.
1.12 aaron 1073: The initial value for the
1074: .Ic stop
1075: character is taken to be
1.1 deraadt 1076: the terminal's
1077: .Ic stop
1078: character.
1079: .It Ic susp
1080: If
1.22 aaron 1081: .Nm
1.1 deraadt 1082: is in
1083: .Ic localchars
1084: mode, or
1085: .Dv LINEMODE
1086: is enabled, and the
1087: .Ic suspend
1088: character is typed, a
1089: .Dv TELNET SUSP
1090: sequence (see
1091: .Ic send
1092: .Ic susp
1093: above)
1094: is sent to the remote host.
1.12 aaron 1095: The initial value for the
1096: .Ic suspend
1097: character is taken to be
1.1 deraadt 1098: the terminal's
1099: .Ic suspend
1100: character.
1101: .It Ic tracefile
1102: This is the file to which the output, caused by
1103: .Ic netdata
1104: or
1105: .Ic option
1106: tracing being
1107: .Dv TRUE ,
1.22 aaron 1108: will be written.
1109: If it is set to
1.1 deraadt 1110: .Dq Fl ,
1111: then tracing information will be written to standard output (the default).
1112: .It Ic worderase
1113: If
1.22 aaron 1114: .Nm
1.1 deraadt 1115: is operating in
1116: .Dv LINEMODE
1.12 aaron 1117: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1118: be the terminal's
1119: .Ic worderase
1120: character.
1.12 aaron 1121: The initial value for the
1122: .Ic worderase
1123: character is taken to be
1.1 deraadt 1124: the terminal's
1125: .Ic worderase
1126: character.
1127: .It Ic \&?
1128: Displays the legal
1129: .Ic set
1130: .Pq Ic unset
1131: commands.
1132: .El
1.17 aaron 1133: .It Ic skey Ar sequence challenge
1134: The
1135: .Ic skey
1.23 aaron 1136: command computes a response to the S/Key challenge.
1137: See
1.17 aaron 1138: .Xr skey 1
1139: for more information on the S/Key system.
1.16 aaron 1140: .It Ic slc Ar state
1.1 deraadt 1141: The
1142: .Ic slc
1143: command (Set Local Characters) is used to set
1.4 deraadt 1144: or change the state of the special
1.16 aaron 1145: characters when the
1.1 deraadt 1146: .Dv TELNET LINEMODE
1147: option has
1.22 aaron 1148: been enabled.
1149: Special characters are characters that get mapped to
1.1 deraadt 1150: .Tn TELNET
1151: commands sequences (like
1152: .Ic ip
1153: or
1.22 aaron 1154: .Ic quit )
1.1 deraadt 1155: or line editing characters (like
1156: .Ic erase
1157: and
1.22 aaron 1158: .Ic kill ) .
1.1 deraadt 1159: By default, the local special characters are exported.
1160: .Bl -tag -width Fl
1161: .It Ic check
1162: Verify the current settings for the current special characters.
1163: The remote side is requested to send all the current special
1164: character settings, and if there are any discrepancies with
1165: the local side, the local side will switch to the remote value.
1166: .It Ic export
1.22 aaron 1167: Switch to the local defaults for the special characters.
1168: The local default characters are those of the local terminal at
1.1 deraadt 1169: the time when
1.22 aaron 1170: .Nm
1.1 deraadt 1171: was started.
1172: .It Ic import
1173: Switch to the remote defaults for the special characters.
1174: The remote default characters are those of the remote system
1.16 aaron 1175: at the time when the
1.1 deraadt 1176: .Tn TELNET
1177: connection was established.
1178: .It Ic \&?
1179: Prints out help information for the
1180: .Ic slc
1181: command.
1182: .El
1183: .It Ic status
1184: Show the current status of
1.12 aaron 1185: .Nm telnet .
1.1 deraadt 1186: This includes the peer one is connected to, as well
1187: as the current mode.
1.16 aaron 1188: .It Ic toggle Ar arguments Op Ar ...
1.1 deraadt 1189: Toggle (between
1190: .Dv TRUE
1191: and
1192: .Dv FALSE )
1193: various flags that control how
1.22 aaron 1194: .Nm
1.1 deraadt 1195: responds to events.
1196: These flags may be set explicitly to
1197: .Dv TRUE
1198: or
1199: .Dv FALSE
1200: using the
1201: .Ic set
1202: and
1203: .Ic unset
1204: commands listed above.
1205: More than one argument may be specified.
1206: The state of these flags may be interrogated with the
1207: .Ic display
1208: command.
1209: Valid arguments are:
1210: .Bl -tag -width Ar
1211: .It Ic authdebug
1212: Turns on debugging information for the authentication code.
1213: .It Ic autoflush
1214: If
1215: .Ic autoflush
1216: and
1217: .Ic localchars
1218: are both
1219: .Dv TRUE ,
1220: then when the
1.12 aaron 1221: .Ic ao
1.1 deraadt 1222: or
1223: .Ic quit
1224: characters are recognized (and transformed into
1225: .Tn TELNET
1226: sequences; see
1227: .Ic set
1228: above for details),
1.22 aaron 1229: .Nm
1.1 deraadt 1230: refuses to display any data on the user's terminal
1231: until the remote system acknowledges (via a
1232: .Dv TELNET TIMING MARK
1233: option)
1234: that it has processed those
1235: .Tn TELNET
1236: sequences.
1237: The initial value for this toggle is
1238: .Dv TRUE
1239: if the terminal user had not
1240: done an "stty noflsh", otherwise
1241: .Dv FALSE
1242: (see
1.22 aaron 1243: .Xr stty 1 ) .
1.1 deraadt 1244: .It Ic autodecrypt
1245: When the
1246: .Dv TELNET ENCRYPT
1247: option is negotiated, by
1248: default the actual encryption (decryption) of the data
1.22 aaron 1249: stream does not start automatically.
1250: The
1.12 aaron 1251: .Ic autoencrypt
1252: .Pq Ic autodecrypt
1253: command states that encryption of the
1.1 deraadt 1254: output (input) stream should be enabled as soon as
1255: possible.
1256: .Pp
1257: .It Ic autologin
1258: If the remote side supports the
1259: .Dv TELNET AUTHENTICATION
1260: option
1261: .Tn TELNET
1.22 aaron 1262: attempts to use it to perform automatic authentication.
1263: If the
1.1 deraadt 1264: .Dv AUTHENTICATION
1265: option is not supported, the user's login
1.31 ! deraadt 1266: name is propagated through the
1.1 deraadt 1267: .Dv TELNET ENVIRON
1268: option.
1269: This command is the same as specifying
1270: .Ar a
1271: option on the
1272: .Ic open
1273: command.
1274: .It Ic autosynch
1275: If
1276: .Ic autosynch
1277: and
1278: .Ic localchars
1279: are both
1280: .Dv TRUE ,
1281: then when either the
1282: .Ic intr
1283: or
1284: .Ic quit
1.12 aaron 1285: character is typed (see
1.1 deraadt 1286: .Ic set
1287: above for descriptions of the
1288: .Ic intr
1289: and
1290: .Ic quit
1291: characters), the resulting
1292: .Tn TELNET
1293: sequence sent is followed by the
1294: .Dv TELNET SYNCH
1295: sequence.
1296: This procedure
1.12 aaron 1297: .Em should
1.1 deraadt 1298: cause the remote system to begin throwing away all previously
1299: typed input until both of the
1300: .Tn TELNET
1301: sequences have been read and acted upon.
1302: The initial value of this toggle is
1303: .Dv FALSE .
1304: .It Ic binary
1305: Enable or disable the
1306: .Dv TELNET BINARY
1307: option on both input and output.
1308: .It Ic inbinary
1309: Enable or disable the
1310: .Dv TELNET BINARY
1311: option on input.
1312: .It Ic outbinary
1313: Enable or disable the
1314: .Dv TELNET BINARY
1315: option on output.
1316: .It Ic crlf
1317: If this is
1318: .Dv TRUE ,
1319: then carriage returns will be sent as
1320: .Li <CR><LF> .
1321: If this is
1322: .Dv FALSE ,
1.31 ! deraadt 1323: then carriage returns will be sent as
1.1 deraadt 1324: .Li <CR><NUL> .
1325: The initial value for this toggle is
1326: .Dv FALSE .
1327: .It Ic crmod
1328: Toggle carriage return mode.
1329: When this mode is enabled, most carriage return characters received from
1330: the remote host will be mapped into a carriage return followed by
1331: a line feed.
1332: This mode does not affect those characters typed by the user, only
1333: those received from the remote host.
1334: This mode is not very useful unless the remote host
1.12 aaron 1335: only sends carriage return, but never line feeds.
1.1 deraadt 1336: The initial value for this toggle is
1337: .Dv FALSE .
1338: .It Ic debug
1.25 aaron 1339: Toggles socket level debugging (useful only to the superuser).
1.1 deraadt 1340: The initial value for this toggle is
1341: .Dv FALSE .
1342: .It Ic encdebug
1343: Turns on debugging information for the encryption code.
1344: .It Ic localchars
1345: If this is
1346: .Dv TRUE ,
1347: then the
1.12 aaron 1348: .Ic flush ,
1.1 deraadt 1349: .Ic interrupt ,
1.12 aaron 1350: .Ic quit ,
1.1 deraadt 1351: .Ic erase ,
1352: and
1353: .Ic kill
1354: characters (see
1355: .Ic set
1356: above) are recognized locally, and transformed into (hopefully) appropriate
1357: .Tn TELNET
1358: control sequences
1359: (respectively
1.12 aaron 1360: .Ic ao ,
1.1 deraadt 1361: .Ic ip ,
1.12 aaron 1362: .Ic brk ,
1.1 deraadt 1363: .Ic ec ,
1364: and
1.22 aaron 1365: .Ic el ;
1.1 deraadt 1366: see
1367: .Ic send
1368: above).
1369: The initial value for this toggle is
1370: .Dv TRUE
1.12 aaron 1371: in ``old line by line'' mode,
1.1 deraadt 1372: and
1373: .Dv FALSE
1.12 aaron 1374: in ``character at a time'' mode.
1.1 deraadt 1375: When the
1376: .Dv LINEMODE
1377: option is enabled, the value of
1378: .Ic localchars
1379: is ignored, and assumed to always be
1380: .Dv TRUE .
1381: If
1382: .Dv LINEMODE
1383: has ever been enabled, then
1384: .Ic quit
1385: is sent as
1.12 aaron 1386: .Ic abort ,
1387: and
1388: .Ic eof
1.1 deraadt 1389: and
1.5 deraadt 1390: .Ic suspend
1.1 deraadt 1391: are sent as
1.12 aaron 1392: .Ic eof
1393: and
1.5 deraadt 1394: .Ic susp
1395: (see
1.1 deraadt 1396: .Ic send
1397: above).
1398: .It Ic netdata
1399: Toggles the display of all network data (in hexadecimal format).
1400: The initial value for this toggle is
1401: .Dv FALSE .
1402: .It Ic options
1403: Toggles the display of some internal
1.22 aaron 1404: .Nm
1.1 deraadt 1405: protocol processing (having to do with
1406: .Tn TELNET
1407: options).
1408: The initial value for this toggle is
1409: .Dv FALSE .
1410: .It Ic prettydump
1411: When the
1412: .Ic netdata
1413: toggle is enabled, if
1414: .Ic prettydump
1415: is enabled the output from the
1416: .Ic netdata
1417: command will be formatted in a more user readable format.
1418: Spaces are put between each character in the output, and the
1419: beginning of any
1420: .Tn TELNET
1421: escape sequence is preceded by a '*' to aid in locating them.
1422: .It Ic skiprc
1423: When the skiprc toggle is
1424: .Dv TRUE ,
1425: .Tn TELNET
1426: skips the reading of the
1427: .Pa \&.telnetrc
1.12 aaron 1428: file in the user's home
1.22 aaron 1429: directory when connections are opened.
1430: The initial value for this toggle is
1.13 aaron 1431: .Dv FALSE .
1.1 deraadt 1432: .It Ic termdata
1433: Toggles the display of all terminal data (in hexadecimal format).
1434: The initial value for this toggle is
1435: .Dv FALSE .
1436: .It Ic verbose_encrypt
1437: When the
1438: .Ic verbose_encrypt
1439: toggle is
1440: .Dv TRUE ,
1.22 aaron 1441: .Nm
1.1 deraadt 1442: prints out a message each time encryption is enabled or
1.22 aaron 1443: disabled.
1444: The initial value for this toggle is
1.13 aaron 1445: .Dv FALSE .
1.1 deraadt 1446: .It Ic \&?
1447: Displays the legal
1448: .Ic toggle
1449: commands.
1450: .El
1451: .It Ic z
1452: Suspend
1.12 aaron 1453: .Nm telnet .
1.1 deraadt 1454: This command only works when the user is using the
1.12 aaron 1455: .Xr csh 1 .
1.16 aaron 1456: .It Ic \&! Op Ar command
1.1 deraadt 1457: Execute a single command in a subshell on the local
1.22 aaron 1458: system.
1459: If
1.5 deraadt 1460: .Ar command
1.1 deraadt 1461: is omitted, then an interactive
1462: subshell is invoked.
1.16 aaron 1463: .It Ic \&? Op Ar command
1.22 aaron 1464: Get help.
1465: With no arguments,
1466: .Nm
1.1 deraadt 1467: prints a help summary.
1468: If a command is specified,
1.22 aaron 1469: .Nm
1.1 deraadt 1470: will print the help information for just that command.
1471: .El
1472: .Sh ENVIRONMENT
1.22 aaron 1473: .Nm
1.1 deraadt 1474: uses at least the
1475: .Ev HOME ,
1476: .Ev SHELL ,
1477: .Ev DISPLAY ,
1478: and
1479: .Ev TERM
1480: environment variables.
1481: Other environment variables may be propagated
1482: to the other side via the
1483: .Dv TELNET ENVIRON
1484: option.
1485: .Sh FILES
1486: .Bl -tag -width ~/.telnetrc -compact
1487: .It Pa ~/.telnetrc
1488: user customized telnet startup values
1489: .El
1490: .Sh HISTORY
1491: The
1.22 aaron 1492: .Nm
1.1 deraadt 1493: command appeared in
1494: .Bx 4.2 .
1495: .Sh NOTES
1496: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1497: ``old line by line'' mode.
1.1 deraadt 1498: .Pp
1.16 aaron 1499: In ``old line by line'' mode or
1.1 deraadt 1500: .Dv LINEMODE
1501: the terminal's
1502: .Ic eof
1503: character is only recognized (and sent to the remote system)
1504: when it is the first character on a line.
1.20 itojun 1505: .Pp
1506: Source routing is not supported yet for IPv6.
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