Annotation of src/usr.bin/telnet/telnet.1, Revision 1.22
1.22 ! aaron 1: .\" $OpenBSD: telnet.1,v 1.21 2000/03/04 22:19:26 aaron Exp $
1.2 niklas 2: .\" $NetBSD: telnet.1,v 1.5 1996/02/28 21:04:12 thorpej Exp $
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35: .\" from: @(#)telnet.1 8.4 (Berkeley) 2/3/94
36: .\"
37: .Dd February 3, 1994
38: .Dt TELNET 1
1.16 aaron 39: .Os
1.1 deraadt 40: .Sh NAME
41: .Nm telnet
1.16 aaron 42: .Nd user interface to the
1.1 deraadt 43: .Tn TELNET
44: protocol
45: .Sh SYNOPSIS
46: .Nm telnet
47: .Op Fl 8
48: .Op Fl E
49: .Op Fl F
50: .Op Fl K
51: .Op Fl L
52: .Op Fl S Ar tos
53: .Op Fl X Ar authtype
54: .Op Fl a
1.3 niklas 55: .Op Fl b Ar hostalias
1.1 deraadt 56: .Op Fl c
57: .Op Fl d
58: .Op Fl e Ar escapechar
59: .Op Fl f
60: .Op Fl k Ar realm
61: .Op Fl l Ar user
62: .Op Fl n Ar tracefile
63: .Op Fl r
64: .Op Fl x
65: .Oo
66: .Ar host
1.9 deraadt 67: .Op Ar port
1.1 deraadt 68: .Oc
69: .Sh DESCRIPTION
70: The
1.22 ! aaron 71: .Nm
1.1 deraadt 72: command
1.16 aaron 73: is used to communicate with another host using the
1.1 deraadt 74: .Tn TELNET
75: protocol.
76: If
1.22 ! aaron 77: .Nm
1.1 deraadt 78: is invoked without the
79: .Ar host
80: argument, it enters command mode,
81: indicated by its prompt
82: .Pq Nm telnet\&> .
83: In this mode, it accepts and executes the commands listed below.
84: If it is invoked with arguments, it performs an
85: .Ic open
86: command with those arguments.
87: .Pp
1.19 aaron 88: The options are as follows:
1.1 deraadt 89: .Bl -tag -width indent
90: .It Fl 8
1.22 ! aaron 91: Specifies an 8-bit data path.
! 92: This causes an attempt to negotiate the
1.1 deraadt 93: .Dv TELNET BINARY
94: option on both input and output.
95: .It Fl E
96: Stops any character from being recognized as an escape character.
97: .It Fl F
98: If Kerberos V5 authentication is being used, the
99: .Fl F
100: option allows the local credentials to be forwarded
101: to the remote system, including any credentials that
102: have already been forwarded into the local environment.
103: .It Fl K
104: Specifies no automatic login to the remote system.
105: .It Fl L
1.22 ! aaron 106: Specifies an 8-bit data path on output.
! 107: This causes the BINARY option to be negotiated on output.
1.1 deraadt 108: .It Fl S Ar tos
109: Sets the IP type-of-service (TOS) option for the telnet
110: connection to the value
1.12 aaron 111: .Ar tos ,
1.1 deraadt 112: which can be a numeric TOS value
113: or, on systems that support it, a symbolic
1.12 aaron 114: TOS name found in the
115: .Pa /etc/iptos
116: file.
1.16 aaron 117: .It Fl X Ar atype
1.1 deraadt 118: Disables the
119: .Ar atype
120: type of authentication.
121: .It Fl a
122: Attempt automatic login.
123: Currently, this sends the user name via the
124: .Ev USER
125: variable
126: of the
127: .Ev ENVIRON
128: option if supported by the remote system.
129: The name used is that of the current user as returned by
130: .Xr getlogin 2
131: if it agrees with the current user ID,
132: otherwise it is the name associated with the user ID.
1.3 niklas 133: .It Fl b Ar hostalias
134: Uses
135: .Xr bind 2
1.12 aaron 136: on the local socket to bind it to an aliased address (see
1.3 niklas 137: .Xr ifconfig 8
1.12 aaron 138: and the ``alias'' specifier) or to the address of
1.3 niklas 139: another interface than the one naturally chosen by
140: .Xr connect 2 .
1.12 aaron 141: This can be useful when connecting to services which use IP addresses
1.3 niklas 142: for authentication and reconfiguration of the server is undesirable (or
143: impossible).
1.1 deraadt 144: .It Fl c
145: Disables the reading of the user's
146: .Pa \&.telnetrc
1.22 ! aaron 147: file.
! 148: (See the
1.1 deraadt 149: .Ic toggle skiprc
150: command on this man page.)
151: .It Fl d
152: Sets the initial value of the
153: .Ic debug
154: toggle to
1.12 aaron 155: .Dv TRUE .
1.16 aaron 156: .It Fl e Ar escapechar
1.1 deraadt 157: Sets the initial
158: .Nm
159: escape character to
1.9 deraadt 160: .Ar escapechar Ns .
1.1 deraadt 161: If
1.8 deraadt 162: .Ar escapechar
1.1 deraadt 163: is omitted, then
164: there will be no escape character.
165: .It Fl f
166: If Kerberos V5 authentication is being used, the
167: .Fl f
168: option allows the local credentials to be forwarded to the remote system.
169: .It Fl k Ar realm
170: If Kerberos authentication is being used, the
171: .Fl k
1.12 aaron 172: option requests that
1.22 ! aaron 173: .Nm
1.12 aaron 174: obtain tickets for the remote host in
1.8 deraadt 175: realm
176: .Ar realm
177: instead of the remote host's realm, as determined
1.1 deraadt 178: by
179: .Xr krb_realmofhost 3 .
1.16 aaron 180: .It Fl l Ar user
1.1 deraadt 181: When connecting to the remote system, if the remote system
182: understands the
183: .Ev ENVIRON
184: option, then
185: .Ar user
186: will be sent to the remote system as the value for the variable USER.
187: This option implies the
188: .Fl a
189: option.
190: This option may also be used with the
191: .Ic open
192: command.
1.16 aaron 193: .It Fl n Ar tracefile
1.1 deraadt 194: Opens
195: .Ar tracefile
196: for recording trace information.
197: See the
198: .Ic set tracefile
199: command below.
200: .It Fl r
201: Specifies a user interface similar to
202: .Xr rlogin 1 .
203: In this
204: mode, the escape character is set to the tilde (~) character,
1.8 deraadt 205: unless modified by the
206: .Fl e
207: option.
1.1 deraadt 208: .It Fl x
1.10 art 209: Turns on encryption of the data stream if possible.
1.1 deraadt 210: .It Ar host
211: Indicates the official name, an alias, or the Internet address
212: of a remote host.
213: .It Ar port
1.22 ! aaron 214: Indicates a port number (address of an application).
! 215: If a number is not specified, the default
! 216: .Nm
1.1 deraadt 217: port is used.
218: .El
219: .Pp
1.22 ! aaron 220: When in rlogin mode, a line of the form ~.
! 221: disconnects from the
1.1 deraadt 222: remote host; ~ is the telnet escape character.
223: Similarly, the line ~^Z suspends the telnet session.
224: The line ~^] escapes to the normal telnet escape prompt.
225: .Pp
226: Once a connection has been opened,
1.22 ! aaron 227: .Nm
1.1 deraadt 228: will attempt to enable the
229: .Dv TELNET LINEMODE
230: option.
1.12 aaron 231: If this fails,
1.22 ! aaron 232: .Nm
1.1 deraadt 233: will revert to one of two input modes:
1.12 aaron 234: either ``character at a time''
235: or ``old line by line''
1.1 deraadt 236: depending on what the remote system supports.
237: .Pp
1.16 aaron 238: When
1.1 deraadt 239: .Dv LINEMODE
240: is enabled, character processing is done on the
1.22 ! aaron 241: local system, under the control of the remote system.
! 242: When input
1.1 deraadt 243: editing or character echoing is to be disabled, the remote system
1.22 ! aaron 244: will relay that information.
! 245: The remote system will also relay
1.1 deraadt 246: changes to any special characters that happen on the remote
247: system, so that they can take effect on the local system.
248: .Pp
1.12 aaron 249: In ``character at a time'' mode, most
1.1 deraadt 250: text typed is immediately sent to the remote host for processing.
251: .Pp
1.12 aaron 252: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 253: and (normally) only completed lines are sent to the remote host.
1.12 aaron 254: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 255: to turn off and on the local echo
256: (this would mostly be used to enter passwords
257: without the password being echoed).
258: .Pp
1.16 aaron 259: If the
1.1 deraadt 260: .Dv LINEMODE
261: option is enabled, or if the
262: .Ic localchars
263: toggle is
264: .Dv TRUE
1.12 aaron 265: (the default for ``old line by line''; see below),
1.1 deraadt 266: the user's
1.12 aaron 267: .Ic quit ,
1.1 deraadt 268: .Ic intr ,
269: and
270: .Ic flush
271: characters are trapped locally, and sent as
272: .Tn TELNET
273: protocol sequences to the remote side.
1.16 aaron 274: If
1.1 deraadt 275: .Dv LINEMODE
276: has ever been enabled, then the user's
277: .Ic susp
278: and
279: .Ic eof
280: are also sent as
281: .Tn TELNET
282: protocol sequences,
283: and
284: .Ic quit
1.16 aaron 285: is sent as a
1.1 deraadt 286: .Dv TELNET ABORT
1.16 aaron 287: instead of
1.8 deraadt 288: .Dv BREAK .
1.1 deraadt 289: There are options (see
290: .Ic toggle
291: .Ic autoflush
292: and
293: .Ic toggle
294: .Ic autosynch
295: below)
296: which cause this action to flush subsequent output to the terminal
297: (until the remote host acknowledges the
298: .Tn TELNET
299: sequence) and flush previous terminal input
300: (in the case of
301: .Ic quit
302: and
1.22 ! aaron 303: .Ic intr ) .
1.1 deraadt 304: .Pp
305: While connected to a remote host,
1.22 ! aaron 306: .Nm
1.1 deraadt 307: command mode may be entered by typing the
1.22 ! aaron 308: .Nm
1.12 aaron 309: ``escape character'' (initially ``^]'').
1.1 deraadt 310: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 311: Note that the escape character will return to the command mode of the initial
1.18 alex 312: invocation of
1.22 ! aaron 313: .Nm
1.15 aaron 314: that has the controlling terminal. Use the
315: .Cm send escape
316: command to switch to command mode in subsequent
1.22 ! aaron 317: .Nm
1.15 aaron 318: processes on remote hosts.
1.1 deraadt 319: .Pp
320: The following
1.22 ! aaron 321: .Nm
1.1 deraadt 322: commands are available.
323: Only enough of each command to uniquely identify it need be typed
324: (this is also true for arguments to the
1.12 aaron 325: .Ic mode ,
1.1 deraadt 326: .Ic set ,
1.12 aaron 327: .Ic toggle ,
1.1 deraadt 328: .Ic unset ,
1.12 aaron 329: .Ic slc ,
1.1 deraadt 330: .Ic environ ,
331: and
332: .Ic display
333: commands).
334: .Bl -tag -width "mode type"
1.16 aaron 335: .It Ic auth Ar argument Op Ar ...
1.12 aaron 336: The
337: .Ic auth
338: command manipulates the information sent through the
1.1 deraadt 339: .Dv TELNET AUTHENTICATE
1.22 ! aaron 340: option.
! 341: Valid arguments for the
! 342: .Ic auth
! 343: command are as follows:
1.1 deraadt 344: .Bl -tag -width "disable type"
345: .It Ic disable Ar type
1.12 aaron 346: Disables the specified
347: .Ar type
1.22 ! aaron 348: of authentication.
! 349: To obtain a list of available types, use the
1.1 deraadt 350: .Ic auth disable \&?
351: command.
352: .It Ic enable Ar type
1.12 aaron 353: Enables the specified
354: .Ar type
1.22 ! aaron 355: of authentication.
! 356: To obtain a list of available types, use the
1.1 deraadt 357: .Ic auth enable \&?
358: command.
359: .It Ic status
360: Lists the current status of the various types of
361: authentication.
362: .El
363: .It Ic close
364: Close a
365: .Tn TELNET
366: session and return to command mode.
1.16 aaron 367: .It Ic display Ar argument Op Ar ...
1.1 deraadt 368: Displays all, or some, of the
369: .Ic set
370: and
371: .Ic toggle
372: values (see below).
1.12 aaron 373: .It Ic encrypt Ar argument Op Ar ...
374: The
375: .Ic encrypt
376: command manipulates the information sent through the
1.1 deraadt 377: .Dv TELNET ENCRYPT
378: option.
1.14 aaron 379: .Pp
1.1 deraadt 380: Valid arguments for the encrypt command are as follows:
381: .Bl -tag -width Ar
382: .It Ic disable Ar type Ic [input|output]
1.12 aaron 383: Disables the specified
384: .Ar type
1.22 ! aaron 385: of encryption.
! 386: If you omit
1.12 aaron 387: .Ic input
388: and
389: .Ic output ,
390: both input and output
1.22 ! aaron 391: are disabled.
! 392: To obtain a list of available types, use the
1.1 deraadt 393: .Ic encrypt disable \&?
394: command.
395: .It Ic enable Ar type Ic [input|output]
1.12 aaron 396: Enables the specified
397: .Ar type
1.22 ! aaron 398: of encryption.
! 399: If you omit
1.12 aaron 400: .Ic input
401: and
402: .Ic output ,
403: both input and output are
1.22 ! aaron 404: enabled.
! 405: To obtain a list of available types, use the
1.1 deraadt 406: .Ic encrypt enable \&?
407: command.
408: .It Ic input
409: This is the same as the
410: .Ic encrypt start input
411: command.
412: .It Ic -input
413: This is the same as the
414: .Ic encrypt stop input
415: command.
416: .It Ic output
417: This is the same as the
418: .Ic encrypt start output
419: command.
420: .It Ic -output
421: This is the same as the
422: .Ic encrypt stop output
423: command.
424: .It Ic start Ic [input|output]
1.22 ! aaron 425: Attempts to start encryption.
! 426: If you omit
1.1 deraadt 427: .Ic input
428: and
429: .Ic output,
1.22 ! aaron 430: both input and output are enabled.
! 431: To obtain a list of available types, use the
1.1 deraadt 432: .Ic encrypt enable \&?
433: command.
434: .It Ic status
435: Lists the current status of encryption.
436: .It Ic stop Ic [input|output]
1.22 ! aaron 437: Stops encryption.
! 438: If you omit
1.12 aaron 439: .Ic input
440: and
441: .Ic output ,
1.1 deraadt 442: encryption is on both input and output.
443: .It Ic type Ar type
444: Sets the default type of encryption to be used
445: with later
446: .Ic encrypt start
447: or
448: .Ic encrypt stop
449: commands.
450: .El
1.16 aaron 451: .It Ic environ Ar arguments Op Ar ...
1.1 deraadt 452: The
453: .Ic environ
454: command is used to manipulate the
1.11 deraadt 455: variables that may be sent through the
1.1 deraadt 456: .Dv TELNET ENVIRON
457: option.
458: The initial set of variables is taken from the users
459: environment, with only the
460: .Ev DISPLAY
461: and
462: .Ev PRINTER
463: variables being exported by default.
464: The
465: .Ev USER
466: variable is also exported if the
467: .Fl a
468: or
469: .Fl l
470: options are used.
471: .br
472: Valid arguments for the
473: .Ic environ
474: command are:
475: .Bl -tag -width Fl
1.16 aaron 476: .It Ic define Ar variable value
1.1 deraadt 477: Define the variable
478: .Ar variable
479: to have a value of
1.12 aaron 480: .Ar value .
1.1 deraadt 481: Any variables defined by this command are automatically exported.
482: The
483: .Ar value
484: may be enclosed in single or double quotes so
485: that tabs and spaces may be included.
1.16 aaron 486: .It Ic undefine Ar variable
1.1 deraadt 487: Remove
488: .Ar variable
489: from the list of environment variables.
1.16 aaron 490: .It Ic export Ar variable
1.1 deraadt 491: Mark the variable
492: .Ar variable
493: to be exported to the remote side.
1.16 aaron 494: .It Ic unexport Ar variable
1.1 deraadt 495: Mark the variable
496: .Ar variable
497: to not be exported unless
498: explicitly asked for by the remote side.
499: .It Ic list
500: List the current set of environment variables.
501: Those marked with a
502: .Cm *
503: will be sent automatically,
504: other variables will only be sent if explicitly requested.
505: .It Ic \&?
506: Prints out help information for the
507: .Ic environ
508: command.
509: .El
510: .It Ic logout
511: Sends the
512: .Dv TELNET LOGOUT
513: option to the remote side.
514: This command is similar to a
515: .Ic close
516: command; however, if the remote side does not support the
517: .Dv LOGOUT
518: option, nothing happens.
519: If, however, the remote side does support the
520: .Dv LOGOUT
521: option, this command should cause the remote side to close the
522: .Tn TELNET
523: connection.
524: If the remote side also supports the concept of
525: suspending a user's session for later reattachment,
526: the logout argument indicates that you
527: should terminate the session immediately.
1.16 aaron 528: .It Ic mode Ar type
1.12 aaron 529: .Ar type
1.1 deraadt 530: is one of several options, depending on the state of the
531: .Tn TELNET
532: session.
533: The remote host is asked for permission to go into the requested mode.
534: If the remote host is capable of entering that mode, the requested
535: mode will be entered.
536: .Bl -tag -width Ar
537: .It Ic character
538: Disable the
539: .Dv TELNET LINEMODE
540: option, or, if the remote side does not understand the
541: .Dv LINEMODE
1.12 aaron 542: option, then enter ``character at a time'' mode.
1.1 deraadt 543: .It Ic line
544: Enable the
545: .Dv TELNET LINEMODE
546: option, or, if the remote side does not understand the
547: .Dv LINEMODE
1.12 aaron 548: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 549: .It Ic isig Pq Ic \-isig
550: Attempt to enable (disable) the
1.1 deraadt 551: .Dv TRAPSIG
1.16 aaron 552: mode of the
1.1 deraadt 553: .Dv LINEMODE
554: option.
1.16 aaron 555: This requires that the
1.1 deraadt 556: .Dv LINEMODE
557: option be enabled.
1.16 aaron 558: .It Ic edit Pq Ic \-edit
559: Attempt to enable (disable) the
1.1 deraadt 560: .Dv EDIT
1.16 aaron 561: mode of the
1.1 deraadt 562: .Dv LINEMODE
563: option.
1.16 aaron 564: This requires that the
1.1 deraadt 565: .Dv LINEMODE
566: option be enabled.
1.16 aaron 567: .It Ic softtabs Pq Ic \-softtabs
568: Attempt to enable (disable) the
1.1 deraadt 569: .Dv SOFT_TAB
1.16 aaron 570: mode of the
1.1 deraadt 571: .Dv LINEMODE
572: option.
1.16 aaron 573: This requires that the
1.1 deraadt 574: .Dv LINEMODE
575: option be enabled.
1.16 aaron 576: .It Ic litecho Pq Ic \-litecho
577: Attempt to enable (disable) the
1.1 deraadt 578: .Dv LIT_ECHO
1.16 aaron 579: mode of the
1.1 deraadt 580: .Dv LINEMODE
581: option.
1.16 aaron 582: This requires that the
1.1 deraadt 583: .Dv LINEMODE
584: option be enabled.
585: .It Ic \&?
586: Prints out help information for the
587: .Ic mode
588: command.
589: .El
590: .It Xo
591: .Ic open Ar host
1.5 deraadt 592: .Op Fl l Ar user
593: .Oo Op Fl
1.1 deraadt 594: .Ar port Oc
595: .Xc
596: Open a connection to the named host.
597: If no port number
598: is specified,
1.22 ! aaron 599: .Nm
1.1 deraadt 600: will attempt to contact a
601: .Tn TELNET
602: server at the default port.
603: The host specification may be either a host name (see
1.7 deraadt 604: .Xr hosts 5 )
1.12 aaron 605: or an Internet address specified in the ``dot notation'' (see
1.1 deraadt 606: .Xr inet 3 ) .
607: The
1.5 deraadt 608: .Fl l
1.1 deraadt 609: option may be used to specify the user name
610: to be passed to the remote system via the
611: .Ev ENVIRON
612: option.
613: When connecting to a non-standard port,
1.22 ! aaron 614: .Nm
1.1 deraadt 615: omits any automatic initiation of
616: .Tn TELNET
1.22 ! aaron 617: options.
! 618: When the port number is preceded by a minus sign,
1.1 deraadt 619: the initial option negotiation is done.
620: After establishing a connection, the file
621: .Pa \&.telnetrc
622: in the
1.22 ! aaron 623: user's home directory is opened.
! 624: Lines beginning with a ``#'' are
! 625: comment lines.
! 626: Blank lines are ignored.
! 627: Lines that begin
! 628: without whitespace are the start of a machine entry.
! 629: The first thing on the line is the name of the machine that is
! 630: being connected to.
! 631: The rest of the line, and successive
1.21 aaron 632: lines that begin with whitespace are assumed to be
1.22 ! aaron 633: .Nm
1.1 deraadt 634: commands and are processed as if they had been typed
635: in manually to the
1.22 ! aaron 636: .Nm
1.1 deraadt 637: command prompt.
638: .It Ic quit
639: Close any open
640: .Tn TELNET
641: session and exit
1.12 aaron 642: .Nm telnet .
643: An end-of-file (in command mode) will also close a session and exit.
1.16 aaron 644: .It Ic send Ar arguments
1.1 deraadt 645: Sends one or more special character sequences to the remote host.
646: The following are the arguments which may be specified
647: (more than one argument may be specified at a time):
648: .Bl -tag -width escape
649: .It Ic abort
650: Sends the
651: .Dv TELNET ABORT
652: (Abort
653: processes)
654: sequence.
655: .It Ic ao
656: Sends the
657: .Dv TELNET AO
658: (Abort Output) sequence, which should cause the remote system to flush
659: all output
660: .Em from
661: the remote system
662: .Em to
663: the user's terminal.
664: .It Ic ayt
665: Sends the
666: .Dv TELNET AYT
667: (Are You There)
668: sequence, to which the remote system may or may not choose to respond.
669: .It Ic brk
670: Sends the
671: .Dv TELNET BRK
672: (Break) sequence, which may have significance to the remote
673: system.
674: .It Ic ec
675: Sends the
676: .Dv TELNET EC
677: (Erase Character)
678: sequence, which should cause the remote system to erase the last character
679: entered.
680: .It Ic el
681: Sends the
682: .Dv TELNET EL
683: (Erase Line)
684: sequence, which should cause the remote system to erase the line currently
685: being entered.
686: .It Ic eof
687: Sends the
688: .Dv TELNET EOF
689: (End Of File)
690: sequence.
691: .It Ic eor
692: Sends the
693: .Dv TELNET EOR
694: (End of Record)
695: sequence.
696: .It Ic escape
697: Sends the current
1.22 ! aaron 698: .Nm
1.12 aaron 699: escape character (initially ``^]'').
1.1 deraadt 700: .It Ic ga
701: Sends the
702: .Dv TELNET GA
703: (Go Ahead)
704: sequence, which likely has no significance to the remote system.
705: .It Ic getstatus
706: If the remote side supports the
707: .Dv TELNET STATUS
708: command,
709: .Ic getstatus
710: will send the subnegotiation to request that the server send
711: its current option status.
712: .It Ic ip
713: Sends the
714: .Dv TELNET IP
715: (Interrupt Process) sequence, which should cause the remote
716: system to abort the currently running process.
717: .It Ic nop
718: Sends the
719: .Dv TELNET NOP
720: (No OPeration)
721: sequence.
722: .It Ic susp
723: Sends the
724: .Dv TELNET SUSP
725: (SUSPend process)
726: sequence.
727: .It Ic synch
728: Sends the
729: .Dv TELNET SYNCH
730: sequence.
731: This sequence causes the remote system to discard all previously typed
732: (but not yet read) input.
733: This sequence is sent as
734: .Tn TCP
735: urgent
736: data (and may not work if the remote system is a
737: .Bx 4.2
738: system -- if
1.12 aaron 739: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 740: .It Ic do Ar cmd
1.12 aaron 741: Sends the
742: .Dv TELNET DO
743: .Ar cmd
744: sequence.
745: .Ar cmd
746: can be either a decimal number between 0 and 255,
747: or a symbolic name for a specific
748: .Dv TELNET
749: command.
750: .Ar cmd
751: can also be either
752: .Ic help
753: or
754: .Ic \&?
755: to print out help information, including
756: a list of known symbolic names.
1.1 deraadt 757: .It Ic dont Ar cmd
1.12 aaron 758: Sends the
759: .Dv TELNET DONT
760: .Ar cmd
761: sequence.
762: .Ar cmd
763: can be either a decimal number between 0 and 255,
764: or a symbolic name for a specific
765: .Dv TELNET
766: command.
767: .Ar cmd
768: can also be either
769: .Ic help
770: or
771: .Ic \&?
772: to print out help information, including
773: a list of known symbolic names.
1.1 deraadt 774: .It Ic will Ar cmd
1.12 aaron 775: Sends the
776: .Dv TELNET WILL
777: .Ar cmd
778: sequence.
779: .Ar cmd
780: can be either a decimal number between 0 and 255,
781: or a symbolic name for a specific
782: .Dv TELNET
783: command.
784: .Ar cmd
785: can also be either
786: .Ic help
787: or
788: .Ic \&?
789: to print out help information, including
790: a list of known symbolic names.
1.1 deraadt 791: .It Ic wont Ar cmd
792: Sends the
1.12 aaron 793: .Dv TELNET WONT
1.1 deraadt 794: .Ar cmd
795: sequence.
1.12 aaron 796: .Ar cmd
1.1 deraadt 797: can be either a decimal number between 0 and 255,
798: or a symbolic name for a specific
799: .Dv TELNET
800: command.
1.12 aaron 801: .Ar cmd
1.1 deraadt 802: can also be either
803: .Ic help
804: or
805: .Ic \&?
806: to print out help information, including
807: a list of known symbolic names.
808: .It Ic \&?
809: Prints out help information for the
810: .Ic send
811: command.
812: .El
1.16 aaron 813: .It Ic set Ar argument value
814: .It Ic unset Ar argument value
1.1 deraadt 815: The
816: .Ic set
817: command will set any one of a number of
1.22 ! aaron 818: .Nm
1.1 deraadt 819: variables to a specific value or to
820: .Dv TRUE .
821: The special value
822: .Ic off
823: turns off the function associated with
1.12 aaron 824: the variable; this is equivalent to using the
1.1 deraadt 825: .Ic unset
826: command.
827: The
828: .Ic unset
829: command will disable or set to
830: .Dv FALSE
831: any of the specified functions.
832: The values of variables may be interrogated with the
833: .Ic display
834: command.
835: The variables which may be set or unset, but not toggled, are
1.22 ! aaron 836: listed here.
! 837: In addition, any of the variables for the
1.1 deraadt 838: .Ic toggle
839: command may be explicitly set or unset using
840: the
841: .Ic set
842: and
843: .Ic unset
844: commands.
845: .Bl -tag -width escape
846: .It Ic ayt
847: If
848: .Tn TELNET
1.12 aaron 849: is in
850: .Ic localchars
851: mode, or
1.1 deraadt 852: .Dv LINEMODE
853: is enabled, and the status character is typed, a
854: .Dv TELNET AYT
855: sequence (see
856: .Ic send ayt
857: preceding) is sent to the
1.22 ! aaron 858: remote host.
! 859: The initial value for the "Are You There"
1.1 deraadt 860: character is the terminal's status character.
861: .It Ic echo
1.12 aaron 862: This is the value (initially ``^E'') which, when in
863: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 864: of entered characters (for normal processing), and suppressing
865: echoing of entered characters (for entering, say, a password).
866: .It Ic eof
867: If
1.22 ! aaron 868: .Nm
1.1 deraadt 869: is operating in
870: .Dv LINEMODE
1.12 aaron 871: or ``old line by line'' mode, entering this character
1.1 deraadt 872: as the first character on a line will cause this character to be
873: sent to the remote system.
1.12 aaron 874: The initial value of the
875: .Ic eof
876: character is taken to be the terminal's
1.1 deraadt 877: .Ic eof
878: character.
879: .It Ic erase
880: If
1.22 ! aaron 881: .Nm
1.1 deraadt 882: is in
883: .Ic localchars
884: mode (see
885: .Ic toggle
886: .Ic localchars
887: below),
1.12 aaron 888: and if
1.22 ! aaron 889: .Nm
1.12 aaron 890: is operating in ``character at a time'' mode, then when this
1.1 deraadt 891: character is typed, a
892: .Dv TELNET EC
893: sequence (see
894: .Ic send
895: .Ic ec
896: above)
897: is sent to the remote system.
1.12 aaron 898: The initial value for the
899: .Ic erase
900: character is taken to be
1.1 deraadt 901: the terminal's
902: .Ic erase
903: character.
904: .It Ic escape
905: This is the
1.22 ! aaron 906: .Nm
1.12 aaron 907: escape character (initially ``^['') which causes entry
1.1 deraadt 908: into
1.22 ! aaron 909: .Nm
1.1 deraadt 910: command mode (when connected to a remote system).
911: .It Ic flushoutput
912: If
1.22 ! aaron 913: .Nm
1.1 deraadt 914: is in
915: .Ic localchars
916: mode (see
917: .Ic toggle
918: .Ic localchars
919: below)
920: and the
921: .Ic flushoutput
922: character is typed, a
923: .Dv TELNET AO
924: sequence (see
925: .Ic send
926: .Ic ao
927: above)
928: is sent to the remote host.
1.12 aaron 929: The initial value for the
930: .Ic flush
931: character is taken to be
1.1 deraadt 932: the terminal's
933: .Ic flush
934: character.
935: .It Ic forw1
936: .It Ic forw2
937: If
938: .Tn TELNET
939: is operating in
940: .Dv LINEMODE ,
941: these are the
942: characters that, when typed, cause partial lines to be
1.22 ! aaron 943: forwarded to the remote system.
! 944: The initial value for
1.1 deraadt 945: the forwarding characters are taken from the terminal's
946: eol and eol2 characters.
947: .It Ic interrupt
948: If
1.22 ! aaron 949: .Nm
1.1 deraadt 950: is in
951: .Ic localchars
952: mode (see
953: .Ic toggle
954: .Ic localchars
955: below)
956: and the
957: .Ic interrupt
958: character is typed, a
959: .Dv TELNET IP
960: sequence (see
961: .Ic send
962: .Ic ip
963: above)
964: is sent to the remote host.
1.12 aaron 965: The initial value for the
966: .Ic interrupt
967: character is taken to be
1.1 deraadt 968: the terminal's
969: .Ic intr
970: character.
971: .It Ic kill
972: If
1.22 ! aaron 973: .Nm
1.1 deraadt 974: is in
975: .Ic localchars
976: mode (see
977: .Ic toggle
978: .Ic localchars
979: below),
1.12 aaron 980: and if
1.22 ! aaron 981: .Nm
1.12 aaron 982: is operating in ``character at a time'' mode, then when this
1.1 deraadt 983: character is typed, a
984: .Dv TELNET EL
985: sequence (see
986: .Ic send
987: .Ic el
988: above)
989: is sent to the remote system.
1.12 aaron 990: The initial value for the
991: .Ic kill
992: character is taken to be
1.1 deraadt 993: the terminal's
994: .Ic kill
995: character.
996: .It Ic lnext
997: If
1.22 ! aaron 998: .Nm
1.1 deraadt 999: is operating in
1000: .Dv LINEMODE
1.12 aaron 1001: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1002: be the terminal's
1003: .Ic lnext
1004: character.
1.12 aaron 1005: The initial value for the
1006: .Ic lnext
1007: character is taken to be
1.1 deraadt 1008: the terminal's
1009: .Ic lnext
1010: character.
1011: .It Ic quit
1012: If
1.22 ! aaron 1013: .Nm
1.1 deraadt 1014: is in
1015: .Ic localchars
1016: mode (see
1017: .Ic toggle
1018: .Ic localchars
1019: below)
1020: and the
1021: .Ic quit
1022: character is typed, a
1023: .Dv TELNET BRK
1024: sequence (see
1025: .Ic send
1026: .Ic brk
1027: above)
1028: is sent to the remote host.
1.12 aaron 1029: The initial value for the
1030: .Ic quit
1031: character is taken to be
1.1 deraadt 1032: the terminal's
1033: .Ic quit
1034: character.
1035: .It Ic reprint
1036: If
1.22 ! aaron 1037: .Nm
1.1 deraadt 1038: is operating in
1039: .Dv LINEMODE
1.12 aaron 1040: or old line by line'' mode, then this character is taken to
1.1 deraadt 1041: be the terminal's
1042: .Ic reprint
1043: character.
1.12 aaron 1044: The initial value for the
1045: .Ic reprint
1046: character is taken to be
1.1 deraadt 1047: the terminal's
1048: .Ic reprint
1049: character.
1050: .It Ic rlogin
1051: This is the rlogin escape character.
1052: If set, the normal
1053: .Tn TELNET
1054: escape character is ignored unless it is
1055: preceded by this character at the beginning of a line.
1.12 aaron 1056: This character, at the beginning of a line, followed by
1057: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1058: suspends the
1.22 ! aaron 1059: .Nm
! 1060: command.
! 1061: The initial state is to
1.12 aaron 1062: disable the
1063: .Ic rlogin
1064: escape character.
1.1 deraadt 1065: .It Ic start
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 start
1072: character.
1.12 aaron 1073: The initial value for the
1074: .Ic start
1075: character is taken to be
1.1 deraadt 1076: the terminal's
1077: .Ic start
1078: character.
1079: .It Ic stop
1080: If the
1081: .Dv TELNET TOGGLE-FLOW-CONTROL
1082: option has been enabled,
1083: then this character is taken to
1084: be the terminal's
1085: .Ic stop
1086: character.
1.12 aaron 1087: The initial value for the
1088: .Ic stop
1089: character is taken to be
1.1 deraadt 1090: the terminal's
1091: .Ic stop
1092: character.
1093: .It Ic susp
1094: If
1.22 ! aaron 1095: .Nm
1.1 deraadt 1096: is in
1097: .Ic localchars
1098: mode, or
1099: .Dv LINEMODE
1100: is enabled, and the
1101: .Ic suspend
1102: character is typed, a
1103: .Dv TELNET SUSP
1104: sequence (see
1105: .Ic send
1106: .Ic susp
1107: above)
1108: is sent to the remote host.
1.12 aaron 1109: The initial value for the
1110: .Ic suspend
1111: character is taken to be
1.1 deraadt 1112: the terminal's
1113: .Ic suspend
1114: character.
1115: .It Ic tracefile
1116: This is the file to which the output, caused by
1117: .Ic netdata
1118: or
1119: .Ic option
1120: tracing being
1121: .Dv TRUE ,
1.22 ! aaron 1122: will be written.
! 1123: If it is set to
1.1 deraadt 1124: .Dq Fl ,
1125: then tracing information will be written to standard output (the default).
1126: .It Ic worderase
1127: If
1.22 ! aaron 1128: .Nm
1.1 deraadt 1129: is operating in
1130: .Dv LINEMODE
1.12 aaron 1131: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1132: be the terminal's
1133: .Ic worderase
1134: character.
1.12 aaron 1135: The initial value for the
1136: .Ic worderase
1137: character is taken to be
1.1 deraadt 1138: the terminal's
1139: .Ic worderase
1140: character.
1141: .It Ic \&?
1142: Displays the legal
1143: .Ic set
1144: .Pq Ic unset
1145: commands.
1146: .El
1.17 aaron 1147: .It Ic skey Ar sequence challenge
1148: The
1149: .Ic skey
1150: command computes a response to the S/Key challenge. See
1151: .Xr skey 1
1152: for more information on the S/Key system.
1.16 aaron 1153: .It Ic slc Ar state
1.1 deraadt 1154: The
1155: .Ic slc
1156: command (Set Local Characters) is used to set
1.4 deraadt 1157: or change the state of the special
1.16 aaron 1158: characters when the
1.1 deraadt 1159: .Dv TELNET LINEMODE
1160: option has
1.22 ! aaron 1161: been enabled.
! 1162: Special characters are characters that get mapped to
1.1 deraadt 1163: .Tn TELNET
1164: commands sequences (like
1165: .Ic ip
1166: or
1.22 ! aaron 1167: .Ic quit )
1.1 deraadt 1168: or line editing characters (like
1169: .Ic erase
1170: and
1.22 ! aaron 1171: .Ic kill ) .
1.1 deraadt 1172: By default, the local special characters are exported.
1173: .Bl -tag -width Fl
1174: .It Ic check
1175: Verify the current settings for the current special characters.
1176: The remote side is requested to send all the current special
1177: character settings, and if there are any discrepancies with
1178: the local side, the local side will switch to the remote value.
1179: .It Ic export
1.22 ! aaron 1180: Switch to the local defaults for the special characters.
! 1181: The local default characters are those of the local terminal at
1.1 deraadt 1182: the time when
1.22 ! aaron 1183: .Nm
1.1 deraadt 1184: was started.
1185: .It Ic import
1186: Switch to the remote defaults for the special characters.
1187: The remote default characters are those of the remote system
1.16 aaron 1188: at the time when the
1.1 deraadt 1189: .Tn TELNET
1190: connection was established.
1191: .It Ic \&?
1192: Prints out help information for the
1193: .Ic slc
1194: command.
1195: .El
1196: .It Ic status
1197: Show the current status of
1.12 aaron 1198: .Nm telnet .
1.1 deraadt 1199: This includes the peer one is connected to, as well
1200: as the current mode.
1.16 aaron 1201: .It Ic toggle Ar arguments Op Ar ...
1.1 deraadt 1202: Toggle (between
1203: .Dv TRUE
1204: and
1205: .Dv FALSE )
1206: various flags that control how
1.22 ! aaron 1207: .Nm
1.1 deraadt 1208: responds to events.
1209: These flags may be set explicitly to
1210: .Dv TRUE
1211: or
1212: .Dv FALSE
1213: using the
1214: .Ic set
1215: and
1216: .Ic unset
1217: commands listed above.
1218: More than one argument may be specified.
1219: The state of these flags may be interrogated with the
1220: .Ic display
1221: command.
1222: Valid arguments are:
1223: .Bl -tag -width Ar
1224: .It Ic authdebug
1225: Turns on debugging information for the authentication code.
1226: .It Ic autoflush
1227: If
1228: .Ic autoflush
1229: and
1230: .Ic localchars
1231: are both
1232: .Dv TRUE ,
1233: then when the
1.12 aaron 1234: .Ic ao
1.1 deraadt 1235: or
1236: .Ic quit
1237: characters are recognized (and transformed into
1238: .Tn TELNET
1239: sequences; see
1240: .Ic set
1241: above for details),
1.22 ! aaron 1242: .Nm
1.1 deraadt 1243: refuses to display any data on the user's terminal
1244: until the remote system acknowledges (via a
1245: .Dv TELNET TIMING MARK
1246: option)
1247: that it has processed those
1248: .Tn TELNET
1249: sequences.
1250: The initial value for this toggle is
1251: .Dv TRUE
1252: if the terminal user had not
1253: done an "stty noflsh", otherwise
1254: .Dv FALSE
1255: (see
1.22 ! aaron 1256: .Xr stty 1 ) .
1.1 deraadt 1257: .It Ic autodecrypt
1258: When the
1259: .Dv TELNET ENCRYPT
1260: option is negotiated, by
1261: default the actual encryption (decryption) of the data
1.22 ! aaron 1262: stream does not start automatically.
! 1263: The
1.12 aaron 1264: .Ic autoencrypt
1265: .Pq Ic autodecrypt
1266: command states that encryption of the
1.1 deraadt 1267: output (input) stream should be enabled as soon as
1268: possible.
1269: .Pp
1270: .It Ic autologin
1271: If the remote side supports the
1272: .Dv TELNET AUTHENTICATION
1273: option
1274: .Tn TELNET
1.22 ! aaron 1275: attempts to use it to perform automatic authentication.
! 1276: If the
1.1 deraadt 1277: .Dv AUTHENTICATION
1278: option is not supported, the user's login
1279: name are propagated through the
1280: .Dv TELNET ENVIRON
1281: option.
1282: This command is the same as specifying
1283: .Ar a
1284: option on the
1285: .Ic open
1286: command.
1287: .It Ic autosynch
1288: If
1289: .Ic autosynch
1290: and
1291: .Ic localchars
1292: are both
1293: .Dv TRUE ,
1294: then when either the
1295: .Ic intr
1296: or
1297: .Ic quit
1.12 aaron 1298: character is typed (see
1.1 deraadt 1299: .Ic set
1300: above for descriptions of the
1301: .Ic intr
1302: and
1303: .Ic quit
1304: characters), the resulting
1305: .Tn TELNET
1306: sequence sent is followed by the
1307: .Dv TELNET SYNCH
1308: sequence.
1309: This procedure
1.12 aaron 1310: .Em should
1.1 deraadt 1311: cause the remote system to begin throwing away all previously
1312: typed input until both of the
1313: .Tn TELNET
1314: sequences have been read and acted upon.
1315: The initial value of this toggle is
1316: .Dv FALSE .
1317: .It Ic binary
1318: Enable or disable the
1319: .Dv TELNET BINARY
1320: option on both input and output.
1321: .It Ic inbinary
1322: Enable or disable the
1323: .Dv TELNET BINARY
1324: option on input.
1325: .It Ic outbinary
1326: Enable or disable the
1327: .Dv TELNET BINARY
1328: option on output.
1329: .It Ic crlf
1330: If this is
1331: .Dv TRUE ,
1332: then carriage returns will be sent as
1333: .Li <CR><LF> .
1334: If this is
1335: .Dv FALSE ,
1336: then carriage returns will be send as
1337: .Li <CR><NUL> .
1338: The initial value for this toggle is
1339: .Dv FALSE .
1340: .It Ic crmod
1341: Toggle carriage return mode.
1342: When this mode is enabled, most carriage return characters received from
1343: the remote host will be mapped into a carriage return followed by
1344: a line feed.
1345: This mode does not affect those characters typed by the user, only
1346: those received from the remote host.
1347: This mode is not very useful unless the remote host
1.12 aaron 1348: only sends carriage return, but never line feeds.
1.1 deraadt 1349: The initial value for this toggle is
1350: .Dv FALSE .
1351: .It Ic debug
1.12 aaron 1352: Toggles socket level debugging (useful only to the super-user).
1.1 deraadt 1353: The initial value for this toggle is
1354: .Dv FALSE .
1355: .It Ic encdebug
1356: Turns on debugging information for the encryption code.
1357: .It Ic localchars
1358: If this is
1359: .Dv TRUE ,
1360: then the
1.12 aaron 1361: .Ic flush ,
1.1 deraadt 1362: .Ic interrupt ,
1.12 aaron 1363: .Ic quit ,
1.1 deraadt 1364: .Ic erase ,
1365: and
1366: .Ic kill
1367: characters (see
1368: .Ic set
1369: above) are recognized locally, and transformed into (hopefully) appropriate
1370: .Tn TELNET
1371: control sequences
1372: (respectively
1.12 aaron 1373: .Ic ao ,
1.1 deraadt 1374: .Ic ip ,
1.12 aaron 1375: .Ic brk ,
1.1 deraadt 1376: .Ic ec ,
1377: and
1.22 ! aaron 1378: .Ic el ;
1.1 deraadt 1379: see
1380: .Ic send
1381: above).
1382: The initial value for this toggle is
1383: .Dv TRUE
1.12 aaron 1384: in ``old line by line'' mode,
1.1 deraadt 1385: and
1386: .Dv FALSE
1.12 aaron 1387: in ``character at a time'' mode.
1.1 deraadt 1388: When the
1389: .Dv LINEMODE
1390: option is enabled, the value of
1391: .Ic localchars
1392: is ignored, and assumed to always be
1393: .Dv TRUE .
1394: If
1395: .Dv LINEMODE
1396: has ever been enabled, then
1397: .Ic quit
1398: is sent as
1.12 aaron 1399: .Ic abort ,
1400: and
1401: .Ic eof
1.1 deraadt 1402: and
1.5 deraadt 1403: .Ic suspend
1.1 deraadt 1404: are sent as
1.12 aaron 1405: .Ic eof
1406: and
1.5 deraadt 1407: .Ic susp
1408: (see
1.1 deraadt 1409: .Ic send
1410: above).
1411: .It Ic netdata
1412: Toggles the display of all network data (in hexadecimal format).
1413: The initial value for this toggle is
1414: .Dv FALSE .
1415: .It Ic options
1416: Toggles the display of some internal
1.22 ! aaron 1417: .Nm
1.1 deraadt 1418: protocol processing (having to do with
1419: .Tn TELNET
1420: options).
1421: The initial value for this toggle is
1422: .Dv FALSE .
1423: .It Ic prettydump
1424: When the
1425: .Ic netdata
1426: toggle is enabled, if
1427: .Ic prettydump
1428: is enabled the output from the
1429: .Ic netdata
1430: command will be formatted in a more user readable format.
1431: Spaces are put between each character in the output, and the
1432: beginning of any
1433: .Tn TELNET
1434: escape sequence is preceded by a '*' to aid in locating them.
1435: .It Ic skiprc
1436: When the skiprc toggle is
1437: .Dv TRUE ,
1438: .Tn TELNET
1439: skips the reading of the
1440: .Pa \&.telnetrc
1.12 aaron 1441: file in the user's home
1.22 ! aaron 1442: directory when connections are opened.
! 1443: The initial value for this toggle is
1.13 aaron 1444: .Dv FALSE .
1.1 deraadt 1445: .It Ic termdata
1446: Toggles the display of all terminal data (in hexadecimal format).
1447: The initial value for this toggle is
1448: .Dv FALSE .
1449: .It Ic verbose_encrypt
1450: When the
1451: .Ic verbose_encrypt
1452: toggle is
1453: .Dv TRUE ,
1.22 ! aaron 1454: .Nm
1.1 deraadt 1455: prints out a message each time encryption is enabled or
1.22 ! aaron 1456: disabled.
! 1457: The initial value for this toggle is
1.13 aaron 1458: .Dv FALSE .
1.1 deraadt 1459: .It Ic \&?
1460: Displays the legal
1461: .Ic toggle
1462: commands.
1463: .El
1464: .It Ic z
1465: Suspend
1.12 aaron 1466: .Nm telnet .
1.1 deraadt 1467: This command only works when the user is using the
1.12 aaron 1468: .Xr csh 1 .
1.16 aaron 1469: .It Ic \&! Op Ar command
1.1 deraadt 1470: Execute a single command in a subshell on the local
1.22 ! aaron 1471: system.
! 1472: If
1.5 deraadt 1473: .Ar command
1.1 deraadt 1474: is omitted, then an interactive
1475: subshell is invoked.
1.16 aaron 1476: .It Ic \&? Op Ar command
1.22 ! aaron 1477: Get help.
! 1478: With no arguments,
! 1479: .Nm
1.1 deraadt 1480: prints a help summary.
1481: If a command is specified,
1.22 ! aaron 1482: .Nm
1.1 deraadt 1483: will print the help information for just that command.
1484: .El
1485: .Sh ENVIRONMENT
1.22 ! aaron 1486: .Nm
1.1 deraadt 1487: uses at least the
1488: .Ev HOME ,
1489: .Ev SHELL ,
1490: .Ev DISPLAY ,
1491: and
1492: .Ev TERM
1493: environment variables.
1494: Other environment variables may be propagated
1495: to the other side via the
1496: .Dv TELNET ENVIRON
1497: option.
1498: .Sh FILES
1499: .Bl -tag -width ~/.telnetrc -compact
1500: .It Pa ~/.telnetrc
1501: user customized telnet startup values
1502: .El
1503: .Sh HISTORY
1504: The
1.22 ! aaron 1505: .Nm
1.1 deraadt 1506: command appeared in
1507: .Bx 4.2 .
1508: .Sh NOTES
1509: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1510: ``old line by line'' mode.
1.1 deraadt 1511: .Pp
1.16 aaron 1512: In ``old line by line'' mode or
1.1 deraadt 1513: .Dv LINEMODE
1514: the terminal's
1515: .Ic eof
1516: character is only recognized (and sent to the remote system)
1517: when it is the first character on a line.
1.20 itojun 1518: .Pp
1519: Source routing is not supported yet for IPv6.
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