Annotation of src/usr.bin/telnet/telnet.1, Revision 1.30
1.30 ! millert 1: .\" $OpenBSD: telnet.1,v 1.29 2002/03/22 13:49:28 hin 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:
1.27 aaron 78: .Bl -tag -width Ds
1.1 deraadt 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
1.28 hin 87: If Kerberos 5 authentication is being used, the
1.1 deraadt 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
1.28 hin 146: If Kerberos 5 authentication is being used, the
1.1 deraadt 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
1.30 ! millert 182: .Nm rlogin .
1.1 deraadt 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
1.29 hin 189: Turn on encryption of the data stream. When this option is turned on,
190: .Nm
191: will exit with an error if authentication cannot be negotiated or if
192: encryption cannot be turned on.
1.1 deraadt 193: .It Ar host
194: Indicates the official name, an alias, or the Internet address
195: of a remote host.
196: .It Ar port
1.22 aaron 197: Indicates a port number (address of an application).
198: If a number is not specified, the default
199: .Nm
1.1 deraadt 200: port is used.
201: .El
202: .Pp
1.22 aaron 203: When in rlogin mode, a line of the form ~.
204: disconnects from the
1.1 deraadt 205: remote host; ~ is the telnet escape character.
206: Similarly, the line ~^Z suspends the telnet session.
207: The line ~^] escapes to the normal telnet escape prompt.
208: .Pp
209: Once a connection has been opened,
1.22 aaron 210: .Nm
1.1 deraadt 211: will attempt to enable the
212: .Dv TELNET LINEMODE
213: option.
1.12 aaron 214: If this fails,
1.22 aaron 215: .Nm
1.1 deraadt 216: will revert to one of two input modes:
1.12 aaron 217: either ``character at a time''
218: or ``old line by line''
1.1 deraadt 219: depending on what the remote system supports.
220: .Pp
1.16 aaron 221: When
1.1 deraadt 222: .Dv LINEMODE
223: is enabled, character processing is done on the
1.22 aaron 224: local system, under the control of the remote system.
225: When input
1.1 deraadt 226: editing or character echoing is to be disabled, the remote system
1.22 aaron 227: will relay that information.
228: The remote system will also relay
1.1 deraadt 229: changes to any special characters that happen on the remote
230: system, so that they can take effect on the local system.
231: .Pp
1.12 aaron 232: In ``character at a time'' mode, most
1.1 deraadt 233: text typed is immediately sent to the remote host for processing.
234: .Pp
1.12 aaron 235: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 236: and (normally) only completed lines are sent to the remote host.
1.12 aaron 237: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 238: to turn off and on the local echo
239: (this would mostly be used to enter passwords
240: without the password being echoed).
241: .Pp
1.16 aaron 242: If the
1.1 deraadt 243: .Dv LINEMODE
244: option is enabled, or if the
245: .Ic localchars
246: toggle is
247: .Dv TRUE
1.12 aaron 248: (the default for ``old line by line''; see below),
1.1 deraadt 249: the user's
1.12 aaron 250: .Ic quit ,
1.1 deraadt 251: .Ic intr ,
252: and
253: .Ic flush
254: characters are trapped locally, and sent as
255: .Tn TELNET
256: protocol sequences to the remote side.
1.16 aaron 257: If
1.1 deraadt 258: .Dv LINEMODE
259: has ever been enabled, then the user's
260: .Ic susp
261: and
262: .Ic eof
263: are also sent as
264: .Tn TELNET
265: protocol sequences,
266: and
267: .Ic quit
1.16 aaron 268: is sent as a
1.1 deraadt 269: .Dv TELNET ABORT
1.16 aaron 270: instead of
1.8 deraadt 271: .Dv BREAK .
1.1 deraadt 272: There are options (see
273: .Ic toggle
274: .Ic autoflush
275: and
276: .Ic toggle
277: .Ic autosynch
278: below)
279: which cause this action to flush subsequent output to the terminal
280: (until the remote host acknowledges the
281: .Tn TELNET
282: sequence) and flush previous terminal input
283: (in the case of
284: .Ic quit
285: and
1.22 aaron 286: .Ic intr ) .
1.1 deraadt 287: .Pp
288: While connected to a remote host,
1.22 aaron 289: .Nm
1.1 deraadt 290: command mode may be entered by typing the
1.22 aaron 291: .Nm
1.12 aaron 292: ``escape character'' (initially ``^]'').
1.1 deraadt 293: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 294: Note that the escape character will return to the command mode of the initial
1.18 alex 295: invocation of
1.22 aaron 296: .Nm
1.23 aaron 297: that has the controlling terminal.
298: Use the
1.15 aaron 299: .Cm send escape
300: command to switch to command mode in subsequent
1.22 aaron 301: .Nm
1.15 aaron 302: processes on remote hosts.
1.1 deraadt 303: .Pp
304: The following
1.22 aaron 305: .Nm
1.1 deraadt 306: commands are available.
307: Only enough of each command to uniquely identify it need be typed
308: (this is also true for arguments to the
1.12 aaron 309: .Ic mode ,
1.1 deraadt 310: .Ic set ,
1.12 aaron 311: .Ic toggle ,
1.1 deraadt 312: .Ic unset ,
1.12 aaron 313: .Ic slc ,
1.1 deraadt 314: .Ic environ ,
315: and
316: .Ic display
317: commands).
318: .Bl -tag -width "mode type"
1.16 aaron 319: .It Ic auth Ar argument Op Ar ...
1.12 aaron 320: The
321: .Ic auth
322: command manipulates the information sent through the
1.1 deraadt 323: .Dv TELNET AUTHENTICATE
1.22 aaron 324: option.
325: Valid arguments for the
326: .Ic auth
327: command are as follows:
1.1 deraadt 328: .Bl -tag -width "disable type"
329: .It Ic disable Ar type
1.12 aaron 330: Disables the specified
331: .Ar type
1.22 aaron 332: of authentication.
333: To obtain a list of available types, use the
1.1 deraadt 334: .Ic auth disable \&?
335: command.
336: .It Ic enable Ar type
1.12 aaron 337: Enables the specified
338: .Ar type
1.22 aaron 339: of authentication.
340: To obtain a list of available types, use the
1.1 deraadt 341: .Ic auth enable \&?
342: command.
343: .It Ic status
344: Lists the current status of the various types of
345: authentication.
346: .El
347: .It Ic close
348: Close a
349: .Tn TELNET
350: session and return to command mode.
1.16 aaron 351: .It Ic display Ar argument Op Ar ...
1.1 deraadt 352: Displays all, or some, of the
353: .Ic set
354: and
355: .Ic toggle
356: values (see below).
1.12 aaron 357: .It Ic encrypt Ar argument Op Ar ...
358: The
359: .Ic encrypt
360: command manipulates the information sent through the
1.1 deraadt 361: .Dv TELNET ENCRYPT
1.28 hin 362: option that's available when Kerberos is used.
1.14 aaron 363: .Pp
1.1 deraadt 364: Valid arguments for the encrypt command are as follows:
365: .Bl -tag -width Ar
366: .It Ic disable Ar type Ic [input|output]
1.12 aaron 367: Disables the specified
368: .Ar type
1.22 aaron 369: of encryption.
370: If you omit
1.12 aaron 371: .Ic input
372: and
373: .Ic output ,
374: both input and output
1.22 aaron 375: are disabled.
376: To obtain a list of available types, use the
1.1 deraadt 377: .Ic encrypt disable \&?
378: command.
379: .It Ic enable Ar type Ic [input|output]
1.12 aaron 380: Enables the specified
381: .Ar type
1.22 aaron 382: of encryption.
383: If you omit
1.12 aaron 384: .Ic input
385: and
386: .Ic output ,
387: both input and output are
1.22 aaron 388: enabled.
389: To obtain a list of available types, use the
1.1 deraadt 390: .Ic encrypt enable \&?
391: command.
392: .It Ic input
393: This is the same as the
394: .Ic encrypt start input
395: command.
396: .It Ic -input
397: This is the same as the
398: .Ic encrypt stop input
399: command.
400: .It Ic output
401: This is the same as the
402: .Ic encrypt start output
403: command.
404: .It Ic -output
405: This is the same as the
406: .Ic encrypt stop output
407: command.
408: .It Ic start Ic [input|output]
1.22 aaron 409: Attempts to start encryption.
410: If you omit
1.1 deraadt 411: .Ic input
412: and
1.24 aaron 413: .Ic output ,
1.22 aaron 414: both input and output are enabled.
415: To obtain a list of available types, use the
1.1 deraadt 416: .Ic encrypt enable \&?
417: command.
418: .It Ic status
419: Lists the current status of encryption.
420: .It Ic stop Ic [input|output]
1.22 aaron 421: Stops encryption.
422: If you omit
1.12 aaron 423: .Ic input
424: and
425: .Ic output ,
1.1 deraadt 426: encryption is on both input and output.
427: .It Ic type Ar type
428: Sets the default type of encryption to be used
429: with later
430: .Ic encrypt start
431: or
432: .Ic encrypt stop
433: commands.
434: .El
1.16 aaron 435: .It Ic environ Ar arguments Op Ar ...
1.1 deraadt 436: The
437: .Ic environ
438: command is used to manipulate the
1.11 deraadt 439: variables that may be sent through the
1.1 deraadt 440: .Dv TELNET ENVIRON
441: option.
442: The initial set of variables is taken from the users
443: environment, with only the
444: .Ev DISPLAY
445: and
446: .Ev PRINTER
447: variables being exported by default.
448: The
449: .Ev USER
450: variable is also exported if the
451: .Fl a
452: or
453: .Fl l
454: options are used.
455: .br
456: Valid arguments for the
457: .Ic environ
458: command are:
459: .Bl -tag -width Fl
1.16 aaron 460: .It Ic define Ar variable value
1.1 deraadt 461: Define the variable
462: .Ar variable
463: to have a value of
1.12 aaron 464: .Ar value .
1.1 deraadt 465: Any variables defined by this command are automatically exported.
466: The
467: .Ar value
468: may be enclosed in single or double quotes so
469: that tabs and spaces may be included.
1.16 aaron 470: .It Ic undefine Ar variable
1.1 deraadt 471: Remove
472: .Ar variable
473: from the list of environment variables.
1.16 aaron 474: .It Ic export Ar variable
1.1 deraadt 475: Mark the variable
476: .Ar variable
477: to be exported to the remote side.
1.16 aaron 478: .It Ic unexport Ar variable
1.1 deraadt 479: Mark the variable
480: .Ar variable
481: to not be exported unless
482: explicitly asked for by the remote side.
483: .It Ic list
484: List the current set of environment variables.
485: Those marked with a
486: .Cm *
487: will be sent automatically,
488: other variables will only be sent if explicitly requested.
489: .It Ic \&?
490: Prints out help information for the
491: .Ic environ
492: command.
493: .El
494: .It Ic logout
495: Sends the
496: .Dv TELNET LOGOUT
497: option to the remote side.
498: This command is similar to a
499: .Ic close
500: command; however, if the remote side does not support the
501: .Dv LOGOUT
502: option, nothing happens.
503: If, however, the remote side does support the
504: .Dv LOGOUT
505: option, this command should cause the remote side to close the
506: .Tn TELNET
507: connection.
508: If the remote side also supports the concept of
509: suspending a user's session for later reattachment,
510: the logout argument indicates that you
511: should terminate the session immediately.
1.16 aaron 512: .It Ic mode Ar type
1.12 aaron 513: .Ar type
1.1 deraadt 514: is one of several options, depending on the state of the
515: .Tn TELNET
516: session.
517: The remote host is asked for permission to go into the requested mode.
518: If the remote host is capable of entering that mode, the requested
519: mode will be entered.
520: .Bl -tag -width Ar
521: .It Ic character
522: Disable the
523: .Dv TELNET LINEMODE
524: option, or, if the remote side does not understand the
525: .Dv LINEMODE
1.12 aaron 526: option, then enter ``character at a time'' mode.
1.1 deraadt 527: .It Ic line
528: Enable the
529: .Dv TELNET LINEMODE
530: option, or, if the remote side does not understand the
531: .Dv LINEMODE
1.12 aaron 532: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 533: .It Ic isig Pq Ic \-isig
534: Attempt to enable (disable) the
1.1 deraadt 535: .Dv TRAPSIG
1.16 aaron 536: mode of the
1.1 deraadt 537: .Dv LINEMODE
538: option.
1.16 aaron 539: This requires that the
1.1 deraadt 540: .Dv LINEMODE
541: option be enabled.
1.16 aaron 542: .It Ic edit Pq Ic \-edit
543: Attempt to enable (disable) the
1.1 deraadt 544: .Dv EDIT
1.16 aaron 545: mode of the
1.1 deraadt 546: .Dv LINEMODE
547: option.
1.16 aaron 548: This requires that the
1.1 deraadt 549: .Dv LINEMODE
550: option be enabled.
1.16 aaron 551: .It Ic softtabs Pq Ic \-softtabs
552: Attempt to enable (disable) the
1.1 deraadt 553: .Dv SOFT_TAB
1.16 aaron 554: mode of the
1.1 deraadt 555: .Dv LINEMODE
556: option.
1.16 aaron 557: This requires that the
1.1 deraadt 558: .Dv LINEMODE
559: option be enabled.
1.16 aaron 560: .It Ic litecho Pq Ic \-litecho
561: Attempt to enable (disable) the
1.1 deraadt 562: .Dv LIT_ECHO
1.16 aaron 563: mode of the
1.1 deraadt 564: .Dv LINEMODE
565: option.
1.16 aaron 566: This requires that the
1.1 deraadt 567: .Dv LINEMODE
568: option be enabled.
569: .It Ic \&?
570: Prints out help information for the
571: .Ic mode
572: command.
573: .El
574: .It Xo
575: .Ic open Ar host
1.5 deraadt 576: .Op Fl l Ar user
577: .Oo Op Fl
1.1 deraadt 578: .Ar port Oc
579: .Xc
580: Open a connection to the named host.
581: If no port number
582: is specified,
1.22 aaron 583: .Nm
1.1 deraadt 584: will attempt to contact a
585: .Tn TELNET
586: server at the default port.
587: The host specification may be either a host name (see
1.7 deraadt 588: .Xr hosts 5 )
1.12 aaron 589: or an Internet address specified in the ``dot notation'' (see
1.1 deraadt 590: .Xr inet 3 ) .
591: The
1.5 deraadt 592: .Fl l
1.1 deraadt 593: option may be used to specify the user name
594: to be passed to the remote system via the
595: .Ev ENVIRON
596: option.
597: When connecting to a non-standard port,
1.22 aaron 598: .Nm
1.1 deraadt 599: omits any automatic initiation of
600: .Tn TELNET
1.22 aaron 601: options.
602: When the port number is preceded by a minus sign,
1.1 deraadt 603: the initial option negotiation is done.
604: After establishing a connection, the file
605: .Pa \&.telnetrc
606: in the
1.22 aaron 607: user's home directory is opened.
608: Lines beginning with a ``#'' are
609: comment lines.
610: Blank lines are ignored.
611: Lines that begin
612: without whitespace are the start of a machine entry.
613: The first thing on the line is the name of the machine that is
614: being connected to.
615: The rest of the line, and successive
1.21 aaron 616: lines that begin with whitespace are assumed to be
1.22 aaron 617: .Nm
1.1 deraadt 618: commands and are processed as if they had been typed
619: in manually to the
1.22 aaron 620: .Nm
1.1 deraadt 621: command prompt.
622: .It Ic quit
623: Close any open
624: .Tn TELNET
625: session and exit
1.12 aaron 626: .Nm telnet .
627: An end-of-file (in command mode) will also close a session and exit.
1.16 aaron 628: .It Ic send Ar arguments
1.1 deraadt 629: Sends one or more special character sequences to the remote host.
630: The following are the arguments which may be specified
631: (more than one argument may be specified at a time):
632: .Bl -tag -width escape
633: .It Ic abort
634: Sends the
635: .Dv TELNET ABORT
636: (Abort
637: processes)
638: sequence.
639: .It Ic ao
640: Sends the
641: .Dv TELNET AO
642: (Abort Output) sequence, which should cause the remote system to flush
643: all output
644: .Em from
645: the remote system
646: .Em to
647: the user's terminal.
648: .It Ic ayt
649: Sends the
650: .Dv TELNET AYT
651: (Are You There)
652: sequence, to which the remote system may or may not choose to respond.
653: .It Ic brk
654: Sends the
655: .Dv TELNET BRK
656: (Break) sequence, which may have significance to the remote
657: system.
658: .It Ic ec
659: Sends the
660: .Dv TELNET EC
661: (Erase Character)
662: sequence, which should cause the remote system to erase the last character
663: entered.
664: .It Ic el
665: Sends the
666: .Dv TELNET EL
667: (Erase Line)
668: sequence, which should cause the remote system to erase the line currently
669: being entered.
670: .It Ic eof
671: Sends the
672: .Dv TELNET EOF
673: (End Of File)
674: sequence.
675: .It Ic eor
676: Sends the
677: .Dv TELNET EOR
678: (End of Record)
679: sequence.
680: .It Ic escape
681: Sends the current
1.22 aaron 682: .Nm
1.12 aaron 683: escape character (initially ``^]'').
1.1 deraadt 684: .It Ic ga
685: Sends the
686: .Dv TELNET GA
687: (Go Ahead)
688: sequence, which likely has no significance to the remote system.
689: .It Ic getstatus
690: If the remote side supports the
691: .Dv TELNET STATUS
692: command,
693: .Ic getstatus
694: will send the subnegotiation to request that the server send
695: its current option status.
696: .It Ic ip
697: Sends the
698: .Dv TELNET IP
699: (Interrupt Process) sequence, which should cause the remote
700: system to abort the currently running process.
701: .It Ic nop
702: Sends the
703: .Dv TELNET NOP
704: (No OPeration)
705: sequence.
706: .It Ic susp
707: Sends the
708: .Dv TELNET SUSP
709: (SUSPend process)
710: sequence.
711: .It Ic synch
712: Sends the
713: .Dv TELNET SYNCH
714: sequence.
715: This sequence causes the remote system to discard all previously typed
716: (but not yet read) input.
717: This sequence is sent as
718: .Tn TCP
719: urgent
720: data (and may not work if the remote system is a
721: .Bx 4.2
722: system -- if
1.12 aaron 723: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 724: .It Ic do Ar cmd
1.12 aaron 725: Sends the
726: .Dv TELNET DO
727: .Ar cmd
728: sequence.
729: .Ar cmd
730: can be either a decimal number between 0 and 255,
731: or a symbolic name for a specific
732: .Dv TELNET
733: command.
734: .Ar cmd
735: can also be either
736: .Ic help
737: or
738: .Ic \&?
739: to print out help information, including
740: a list of known symbolic names.
1.1 deraadt 741: .It Ic dont Ar cmd
1.12 aaron 742: Sends the
743: .Dv TELNET DONT
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 will Ar cmd
1.12 aaron 759: Sends the
760: .Dv TELNET WILL
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 wont Ar cmd
776: Sends the
1.12 aaron 777: .Dv TELNET WONT
1.1 deraadt 778: .Ar cmd
779: sequence.
1.12 aaron 780: .Ar cmd
1.1 deraadt 781: can be either a decimal number between 0 and 255,
782: or a symbolic name for a specific
783: .Dv TELNET
784: command.
1.12 aaron 785: .Ar cmd
1.1 deraadt 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.
792: .It Ic \&?
793: Prints out help information for the
794: .Ic send
795: command.
796: .El
1.16 aaron 797: .It Ic set Ar argument value
798: .It Ic unset Ar argument value
1.1 deraadt 799: The
800: .Ic set
801: command will set any one of a number of
1.22 aaron 802: .Nm
1.1 deraadt 803: variables to a specific value or to
804: .Dv TRUE .
805: The special value
806: .Ic off
807: turns off the function associated with
1.12 aaron 808: the variable; this is equivalent to using the
1.1 deraadt 809: .Ic unset
810: command.
811: The
812: .Ic unset
813: command will disable or set to
814: .Dv FALSE
815: any of the specified functions.
816: The values of variables may be interrogated with the
817: .Ic display
818: command.
819: The variables which may be set or unset, but not toggled, are
1.22 aaron 820: listed here.
821: In addition, any of the variables for the
1.1 deraadt 822: .Ic toggle
823: command may be explicitly set or unset using
824: the
825: .Ic set
826: and
827: .Ic unset
828: commands.
829: .Bl -tag -width escape
830: .It Ic ayt
831: If
832: .Tn TELNET
1.12 aaron 833: is in
834: .Ic localchars
835: mode, or
1.1 deraadt 836: .Dv LINEMODE
837: is enabled, and the status character is typed, a
838: .Dv TELNET AYT
839: sequence (see
840: .Ic send ayt
841: preceding) is sent to the
1.22 aaron 842: remote host.
843: The initial value for the "Are You There"
1.1 deraadt 844: character is the terminal's status character.
845: .It Ic echo
1.12 aaron 846: This is the value (initially ``^E'') which, when in
847: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 848: of entered characters (for normal processing), and suppressing
849: echoing of entered characters (for entering, say, a password).
850: .It Ic eof
851: If
1.22 aaron 852: .Nm
1.1 deraadt 853: is operating in
854: .Dv LINEMODE
1.12 aaron 855: or ``old line by line'' mode, entering this character
1.1 deraadt 856: as the first character on a line will cause this character to be
857: sent to the remote system.
1.12 aaron 858: The initial value of the
859: .Ic eof
860: character is taken to be the terminal's
1.1 deraadt 861: .Ic eof
862: character.
863: .It Ic erase
864: If
1.22 aaron 865: .Nm
1.1 deraadt 866: is in
867: .Ic localchars
868: mode (see
869: .Ic toggle
870: .Ic localchars
871: below),
1.12 aaron 872: and if
1.22 aaron 873: .Nm
1.12 aaron 874: is operating in ``character at a time'' mode, then when this
1.1 deraadt 875: character is typed, a
876: .Dv TELNET EC
877: sequence (see
878: .Ic send
879: .Ic ec
880: above)
881: is sent to the remote system.
1.12 aaron 882: The initial value for the
883: .Ic erase
884: character is taken to be
1.1 deraadt 885: the terminal's
886: .Ic erase
887: character.
888: .It Ic escape
889: This is the
1.22 aaron 890: .Nm
1.12 aaron 891: escape character (initially ``^['') which causes entry
1.1 deraadt 892: into
1.22 aaron 893: .Nm
1.1 deraadt 894: command mode (when connected to a remote system).
895: .It Ic flushoutput
896: If
1.22 aaron 897: .Nm
1.1 deraadt 898: is in
899: .Ic localchars
900: mode (see
901: .Ic toggle
902: .Ic localchars
903: below)
904: and the
905: .Ic flushoutput
906: character is typed, a
907: .Dv TELNET AO
908: sequence (see
909: .Ic send
910: .Ic ao
911: above)
912: is sent to the remote host.
1.12 aaron 913: The initial value for the
914: .Ic flush
915: character is taken to be
1.1 deraadt 916: the terminal's
917: .Ic flush
918: character.
919: .It Ic forw1
920: .It Ic forw2
921: If
922: .Tn TELNET
923: is operating in
924: .Dv LINEMODE ,
925: these are the
926: characters that, when typed, cause partial lines to be
1.22 aaron 927: forwarded to the remote system.
928: The initial value for
1.1 deraadt 929: the forwarding characters are taken from the terminal's
930: eol and eol2 characters.
931: .It Ic interrupt
932: If
1.22 aaron 933: .Nm
1.1 deraadt 934: is in
935: .Ic localchars
936: mode (see
937: .Ic toggle
938: .Ic localchars
939: below)
940: and the
941: .Ic interrupt
942: character is typed, a
943: .Dv TELNET IP
944: sequence (see
945: .Ic send
946: .Ic ip
947: above)
948: is sent to the remote host.
1.12 aaron 949: The initial value for the
950: .Ic interrupt
951: character is taken to be
1.1 deraadt 952: the terminal's
953: .Ic intr
954: character.
955: .It Ic kill
956: If
1.22 aaron 957: .Nm
1.1 deraadt 958: is in
959: .Ic localchars
960: mode (see
961: .Ic toggle
962: .Ic localchars
963: below),
1.12 aaron 964: and if
1.22 aaron 965: .Nm
1.12 aaron 966: is operating in ``character at a time'' mode, then when this
1.1 deraadt 967: character is typed, a
968: .Dv TELNET EL
969: sequence (see
970: .Ic send
971: .Ic el
972: above)
973: is sent to the remote system.
1.12 aaron 974: The initial value for the
975: .Ic kill
976: character is taken to be
1.1 deraadt 977: the terminal's
978: .Ic kill
979: character.
980: .It Ic lnext
981: If
1.22 aaron 982: .Nm
1.1 deraadt 983: is operating in
984: .Dv LINEMODE
1.12 aaron 985: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 986: be the terminal's
987: .Ic lnext
988: character.
1.12 aaron 989: The initial value for the
990: .Ic lnext
991: character is taken to be
1.1 deraadt 992: the terminal's
993: .Ic lnext
994: character.
995: .It Ic quit
996: If
1.22 aaron 997: .Nm
1.1 deraadt 998: is in
999: .Ic localchars
1000: mode (see
1001: .Ic toggle
1002: .Ic localchars
1003: below)
1004: and the
1005: .Ic quit
1006: character is typed, a
1007: .Dv TELNET BRK
1008: sequence (see
1009: .Ic send
1010: .Ic brk
1011: above)
1012: is sent to the remote host.
1.12 aaron 1013: The initial value for the
1014: .Ic quit
1015: character is taken to be
1.1 deraadt 1016: the terminal's
1017: .Ic quit
1018: character.
1019: .It Ic reprint
1020: If
1.22 aaron 1021: .Nm
1.1 deraadt 1022: is operating in
1023: .Dv LINEMODE
1.12 aaron 1024: or old line by line'' mode, then this character is taken to
1.1 deraadt 1025: be the terminal's
1026: .Ic reprint
1027: character.
1.12 aaron 1028: The initial value for the
1029: .Ic reprint
1030: character is taken to be
1.1 deraadt 1031: the terminal's
1032: .Ic reprint
1033: character.
1034: .It Ic rlogin
1035: This is the rlogin escape character.
1036: If set, the normal
1037: .Tn TELNET
1038: escape character is ignored unless it is
1039: preceded by this character at the beginning of a line.
1.12 aaron 1040: This character, at the beginning of a line, followed by
1041: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1042: suspends the
1.22 aaron 1043: .Nm
1044: command.
1045: The initial state is to
1.12 aaron 1046: disable the
1047: .Ic rlogin
1048: escape character.
1.1 deraadt 1049: .It Ic start
1050: If the
1051: .Dv TELNET TOGGLE-FLOW-CONTROL
1052: option has been enabled,
1053: then this character is taken to
1054: be the terminal's
1055: .Ic start
1056: character.
1.12 aaron 1057: The initial value for the
1058: .Ic start
1059: character is taken to be
1.1 deraadt 1060: the terminal's
1061: .Ic start
1062: character.
1063: .It Ic stop
1064: If the
1065: .Dv TELNET TOGGLE-FLOW-CONTROL
1066: option has been enabled,
1067: then this character is taken to
1068: be the terminal's
1069: .Ic stop
1070: character.
1.12 aaron 1071: The initial value for the
1072: .Ic stop
1073: character is taken to be
1.1 deraadt 1074: the terminal's
1075: .Ic stop
1076: character.
1077: .It Ic susp
1078: If
1.22 aaron 1079: .Nm
1.1 deraadt 1080: is in
1081: .Ic localchars
1082: mode, or
1083: .Dv LINEMODE
1084: is enabled, and the
1085: .Ic suspend
1086: character is typed, a
1087: .Dv TELNET SUSP
1088: sequence (see
1089: .Ic send
1090: .Ic susp
1091: above)
1092: is sent to the remote host.
1.12 aaron 1093: The initial value for the
1094: .Ic suspend
1095: character is taken to be
1.1 deraadt 1096: the terminal's
1097: .Ic suspend
1098: character.
1099: .It Ic tracefile
1100: This is the file to which the output, caused by
1101: .Ic netdata
1102: or
1103: .Ic option
1104: tracing being
1105: .Dv TRUE ,
1.22 aaron 1106: will be written.
1107: If it is set to
1.1 deraadt 1108: .Dq Fl ,
1109: then tracing information will be written to standard output (the default).
1110: .It Ic worderase
1111: If
1.22 aaron 1112: .Nm
1.1 deraadt 1113: is operating in
1114: .Dv LINEMODE
1.12 aaron 1115: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1116: be the terminal's
1117: .Ic worderase
1118: character.
1.12 aaron 1119: The initial value for the
1120: .Ic worderase
1121: character is taken to be
1.1 deraadt 1122: the terminal's
1123: .Ic worderase
1124: character.
1125: .It Ic \&?
1126: Displays the legal
1127: .Ic set
1128: .Pq Ic unset
1129: commands.
1130: .El
1.17 aaron 1131: .It Ic skey Ar sequence challenge
1132: The
1133: .Ic skey
1.23 aaron 1134: command computes a response to the S/Key challenge.
1135: See
1.17 aaron 1136: .Xr skey 1
1137: for more information on the S/Key system.
1.16 aaron 1138: .It Ic slc Ar state
1.1 deraadt 1139: The
1140: .Ic slc
1141: command (Set Local Characters) is used to set
1.4 deraadt 1142: or change the state of the special
1.16 aaron 1143: characters when the
1.1 deraadt 1144: .Dv TELNET LINEMODE
1145: option has
1.22 aaron 1146: been enabled.
1147: Special characters are characters that get mapped to
1.1 deraadt 1148: .Tn TELNET
1149: commands sequences (like
1150: .Ic ip
1151: or
1.22 aaron 1152: .Ic quit )
1.1 deraadt 1153: or line editing characters (like
1154: .Ic erase
1155: and
1.22 aaron 1156: .Ic kill ) .
1.1 deraadt 1157: By default, the local special characters are exported.
1158: .Bl -tag -width Fl
1159: .It Ic check
1160: Verify the current settings for the current special characters.
1161: The remote side is requested to send all the current special
1162: character settings, and if there are any discrepancies with
1163: the local side, the local side will switch to the remote value.
1164: .It Ic export
1.22 aaron 1165: Switch to the local defaults for the special characters.
1166: The local default characters are those of the local terminal at
1.1 deraadt 1167: the time when
1.22 aaron 1168: .Nm
1.1 deraadt 1169: was started.
1170: .It Ic import
1171: Switch to the remote defaults for the special characters.
1172: The remote default characters are those of the remote system
1.16 aaron 1173: at the time when the
1.1 deraadt 1174: .Tn TELNET
1175: connection was established.
1176: .It Ic \&?
1177: Prints out help information for the
1178: .Ic slc
1179: command.
1180: .El
1181: .It Ic status
1182: Show the current status of
1.12 aaron 1183: .Nm telnet .
1.1 deraadt 1184: This includes the peer one is connected to, as well
1185: as the current mode.
1.16 aaron 1186: .It Ic toggle Ar arguments Op Ar ...
1.1 deraadt 1187: Toggle (between
1188: .Dv TRUE
1189: and
1190: .Dv FALSE )
1191: various flags that control how
1.22 aaron 1192: .Nm
1.1 deraadt 1193: responds to events.
1194: These flags may be set explicitly to
1195: .Dv TRUE
1196: or
1197: .Dv FALSE
1198: using the
1199: .Ic set
1200: and
1201: .Ic unset
1202: commands listed above.
1203: More than one argument may be specified.
1204: The state of these flags may be interrogated with the
1205: .Ic display
1206: command.
1207: Valid arguments are:
1208: .Bl -tag -width Ar
1209: .It Ic authdebug
1210: Turns on debugging information for the authentication code.
1211: .It Ic autoflush
1212: If
1213: .Ic autoflush
1214: and
1215: .Ic localchars
1216: are both
1217: .Dv TRUE ,
1218: then when the
1.12 aaron 1219: .Ic ao
1.1 deraadt 1220: or
1221: .Ic quit
1222: characters are recognized (and transformed into
1223: .Tn TELNET
1224: sequences; see
1225: .Ic set
1226: above for details),
1.22 aaron 1227: .Nm
1.1 deraadt 1228: refuses to display any data on the user's terminal
1229: until the remote system acknowledges (via a
1230: .Dv TELNET TIMING MARK
1231: option)
1232: that it has processed those
1233: .Tn TELNET
1234: sequences.
1235: The initial value for this toggle is
1236: .Dv TRUE
1237: if the terminal user had not
1238: done an "stty noflsh", otherwise
1239: .Dv FALSE
1240: (see
1.22 aaron 1241: .Xr stty 1 ) .
1.1 deraadt 1242: .It Ic autodecrypt
1243: When the
1244: .Dv TELNET ENCRYPT
1245: option is negotiated, by
1246: default the actual encryption (decryption) of the data
1.22 aaron 1247: stream does not start automatically.
1248: The
1.12 aaron 1249: .Ic autoencrypt
1250: .Pq Ic autodecrypt
1251: command states that encryption of the
1.1 deraadt 1252: output (input) stream should be enabled as soon as
1253: possible.
1254: .Pp
1255: .It Ic autologin
1256: If the remote side supports the
1257: .Dv TELNET AUTHENTICATION
1258: option
1259: .Tn TELNET
1.22 aaron 1260: attempts to use it to perform automatic authentication.
1261: If the
1.1 deraadt 1262: .Dv AUTHENTICATION
1263: option is not supported, the user's login
1264: name are propagated through the
1265: .Dv TELNET ENVIRON
1266: option.
1267: This command is the same as specifying
1268: .Ar a
1269: option on the
1270: .Ic open
1271: command.
1272: .It Ic autosynch
1273: If
1274: .Ic autosynch
1275: and
1276: .Ic localchars
1277: are both
1278: .Dv TRUE ,
1279: then when either the
1280: .Ic intr
1281: or
1282: .Ic quit
1.12 aaron 1283: character is typed (see
1.1 deraadt 1284: .Ic set
1285: above for descriptions of the
1286: .Ic intr
1287: and
1288: .Ic quit
1289: characters), the resulting
1290: .Tn TELNET
1291: sequence sent is followed by the
1292: .Dv TELNET SYNCH
1293: sequence.
1294: This procedure
1.12 aaron 1295: .Em should
1.1 deraadt 1296: cause the remote system to begin throwing away all previously
1297: typed input until both of the
1298: .Tn TELNET
1299: sequences have been read and acted upon.
1300: The initial value of this toggle is
1301: .Dv FALSE .
1302: .It Ic binary
1303: Enable or disable the
1304: .Dv TELNET BINARY
1305: option on both input and output.
1306: .It Ic inbinary
1307: Enable or disable the
1308: .Dv TELNET BINARY
1309: option on input.
1310: .It Ic outbinary
1311: Enable or disable the
1312: .Dv TELNET BINARY
1313: option on output.
1314: .It Ic crlf
1315: If this is
1316: .Dv TRUE ,
1317: then carriage returns will be sent as
1318: .Li <CR><LF> .
1319: If this is
1320: .Dv FALSE ,
1321: then carriage returns will be send as
1322: .Li <CR><NUL> .
1323: The initial value for this toggle is
1324: .Dv FALSE .
1325: .It Ic crmod
1326: Toggle carriage return mode.
1327: When this mode is enabled, most carriage return characters received from
1328: the remote host will be mapped into a carriage return followed by
1329: a line feed.
1330: This mode does not affect those characters typed by the user, only
1331: those received from the remote host.
1332: This mode is not very useful unless the remote host
1.12 aaron 1333: only sends carriage return, but never line feeds.
1.1 deraadt 1334: The initial value for this toggle is
1335: .Dv FALSE .
1336: .It Ic debug
1.25 aaron 1337: Toggles socket level debugging (useful only to the superuser).
1.1 deraadt 1338: The initial value for this toggle is
1339: .Dv FALSE .
1340: .It Ic encdebug
1341: Turns on debugging information for the encryption code.
1342: .It Ic localchars
1343: If this is
1344: .Dv TRUE ,
1345: then the
1.12 aaron 1346: .Ic flush ,
1.1 deraadt 1347: .Ic interrupt ,
1.12 aaron 1348: .Ic quit ,
1.1 deraadt 1349: .Ic erase ,
1350: and
1351: .Ic kill
1352: characters (see
1353: .Ic set
1354: above) are recognized locally, and transformed into (hopefully) appropriate
1355: .Tn TELNET
1356: control sequences
1357: (respectively
1.12 aaron 1358: .Ic ao ,
1.1 deraadt 1359: .Ic ip ,
1.12 aaron 1360: .Ic brk ,
1.1 deraadt 1361: .Ic ec ,
1362: and
1.22 aaron 1363: .Ic el ;
1.1 deraadt 1364: see
1365: .Ic send
1366: above).
1367: The initial value for this toggle is
1368: .Dv TRUE
1.12 aaron 1369: in ``old line by line'' mode,
1.1 deraadt 1370: and
1371: .Dv FALSE
1.12 aaron 1372: in ``character at a time'' mode.
1.1 deraadt 1373: When the
1374: .Dv LINEMODE
1375: option is enabled, the value of
1376: .Ic localchars
1377: is ignored, and assumed to always be
1378: .Dv TRUE .
1379: If
1380: .Dv LINEMODE
1381: has ever been enabled, then
1382: .Ic quit
1383: is sent as
1.12 aaron 1384: .Ic abort ,
1385: and
1386: .Ic eof
1.1 deraadt 1387: and
1.5 deraadt 1388: .Ic suspend
1.1 deraadt 1389: are sent as
1.12 aaron 1390: .Ic eof
1391: and
1.5 deraadt 1392: .Ic susp
1393: (see
1.1 deraadt 1394: .Ic send
1395: above).
1396: .It Ic netdata
1397: Toggles the display of all network data (in hexadecimal format).
1398: The initial value for this toggle is
1399: .Dv FALSE .
1400: .It Ic options
1401: Toggles the display of some internal
1.22 aaron 1402: .Nm
1.1 deraadt 1403: protocol processing (having to do with
1404: .Tn TELNET
1405: options).
1406: The initial value for this toggle is
1407: .Dv FALSE .
1408: .It Ic prettydump
1409: When the
1410: .Ic netdata
1411: toggle is enabled, if
1412: .Ic prettydump
1413: is enabled the output from the
1414: .Ic netdata
1415: command will be formatted in a more user readable format.
1416: Spaces are put between each character in the output, and the
1417: beginning of any
1418: .Tn TELNET
1419: escape sequence is preceded by a '*' to aid in locating them.
1420: .It Ic skiprc
1421: When the skiprc toggle is
1422: .Dv TRUE ,
1423: .Tn TELNET
1424: skips the reading of the
1425: .Pa \&.telnetrc
1.12 aaron 1426: file in the user's home
1.22 aaron 1427: directory when connections are opened.
1428: The initial value for this toggle is
1.13 aaron 1429: .Dv FALSE .
1.1 deraadt 1430: .It Ic termdata
1431: Toggles the display of all terminal data (in hexadecimal format).
1432: The initial value for this toggle is
1433: .Dv FALSE .
1434: .It Ic verbose_encrypt
1435: When the
1436: .Ic verbose_encrypt
1437: toggle is
1438: .Dv TRUE ,
1.22 aaron 1439: .Nm
1.1 deraadt 1440: prints out a message each time encryption is enabled or
1.22 aaron 1441: disabled.
1442: The initial value for this toggle is
1.13 aaron 1443: .Dv FALSE .
1.1 deraadt 1444: .It Ic \&?
1445: Displays the legal
1446: .Ic toggle
1447: commands.
1448: .El
1449: .It Ic z
1450: Suspend
1.12 aaron 1451: .Nm telnet .
1.1 deraadt 1452: This command only works when the user is using the
1.12 aaron 1453: .Xr csh 1 .
1.16 aaron 1454: .It Ic \&! Op Ar command
1.1 deraadt 1455: Execute a single command in a subshell on the local
1.22 aaron 1456: system.
1457: If
1.5 deraadt 1458: .Ar command
1.1 deraadt 1459: is omitted, then an interactive
1460: subshell is invoked.
1.16 aaron 1461: .It Ic \&? Op Ar command
1.22 aaron 1462: Get help.
1463: With no arguments,
1464: .Nm
1.1 deraadt 1465: prints a help summary.
1466: If a command is specified,
1.22 aaron 1467: .Nm
1.1 deraadt 1468: will print the help information for just that command.
1469: .El
1470: .Sh ENVIRONMENT
1.22 aaron 1471: .Nm
1.1 deraadt 1472: uses at least the
1473: .Ev HOME ,
1474: .Ev SHELL ,
1475: .Ev DISPLAY ,
1476: and
1477: .Ev TERM
1478: environment variables.
1479: Other environment variables may be propagated
1480: to the other side via the
1481: .Dv TELNET ENVIRON
1482: option.
1483: .Sh FILES
1484: .Bl -tag -width ~/.telnetrc -compact
1485: .It Pa ~/.telnetrc
1486: user customized telnet startup values
1487: .El
1488: .Sh HISTORY
1489: The
1.22 aaron 1490: .Nm
1.1 deraadt 1491: command appeared in
1492: .Bx 4.2 .
1493: .Sh NOTES
1494: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1495: ``old line by line'' mode.
1.1 deraadt 1496: .Pp
1.16 aaron 1497: In ``old line by line'' mode or
1.1 deraadt 1498: .Dv LINEMODE
1499: the terminal's
1500: .Ic eof
1501: character is only recognized (and sent to the remote system)
1502: when it is the first character on a line.
1.20 itojun 1503: .Pp
1504: Source routing is not supported yet for IPv6.
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