Annotation of src/usr.bin/telnet/telnet.1, Revision 1.48
1.48 ! jmc 1: .\" $OpenBSD: telnet.1,v 1.47 2014/02/26 20:56:11 claudio Exp $
1.2 niklas 2: .\" $NetBSD: telnet.1,v 1.5 1996/02/28 21:04:12 thorpej Exp $
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1.48 ! jmc 33: .Dd $Mdocdate: February 26 2014 $
1.1 deraadt 34: .Dt TELNET 1
1.16 aaron 35: .Os
1.1 deraadt 36: .Sh NAME
37: .Nm telnet
1.46 schwarze 38: .Nd user interface to the TELNET protocol
1.1 deraadt 39: .Sh SYNOPSIS
40: .Nm telnet
1.31 deraadt 41: .Bk -words
1.38 jmc 42: .Op Fl 468acdEFfKLrx
1.3 niklas 43: .Op Fl b Ar hostalias
1.1 deraadt 44: .Op Fl e Ar escapechar
45: .Op Fl k Ar realm
46: .Op Fl l Ar user
47: .Op Fl n Ar tracefile
1.43 guenther 48: .Op Fl V Ar rtable
1.38 jmc 49: .Op Fl X Ar authtype
1.1 deraadt 50: .Oo
51: .Ar host
1.9 deraadt 52: .Op Ar port
1.1 deraadt 53: .Oc
1.31 deraadt 54: .Ek
1.1 deraadt 55: .Sh DESCRIPTION
56: The
1.22 aaron 57: .Nm
1.1 deraadt 58: command
1.46 schwarze 59: is used to communicate with another host using the TELNET protocol.
1.1 deraadt 60: If
1.22 aaron 61: .Nm
1.1 deraadt 62: is invoked without the
63: .Ar host
64: argument, it enters command mode,
65: indicated by its prompt
66: .Pq Nm telnet\&> .
67: In this mode, it accepts and executes the commands listed below.
68: If it is invoked with arguments, it performs an
69: .Ic open
70: command with those arguments.
71: .Pp
1.19 aaron 72: The options are as follows:
1.27 aaron 73: .Bl -tag -width Ds
1.37 otto 74: .It Fl 4
75: Forces
76: .Nm
77: to use IPv4 addresses only.
78: .It Fl 6
79: Forces
80: .Nm
81: to use IPv6 addresses only.
1.1 deraadt 82: .It Fl 8
1.22 aaron 83: Specifies an 8-bit data path.
84: This causes an attempt to negotiate the
1.1 deraadt 85: .Dv TELNET BINARY
86: option on both input and output.
87: .It Fl a
88: Attempt automatic login.
89: Currently, this sends the user name via the
90: .Ev USER
91: variable
92: of the
93: .Ev ENVIRON
94: option if supported by the remote system.
95: The name used is that of the current user as returned by
96: .Xr getlogin 2
97: if it agrees with the current user ID,
98: otherwise it is the name associated with the user ID.
1.3 niklas 99: .It Fl b Ar hostalias
100: Uses
101: .Xr bind 2
1.12 aaron 102: on the local socket to bind it to an aliased address (see
1.3 niklas 103: .Xr ifconfig 8
1.12 aaron 104: and the ``alias'' specifier) or to the address of
1.3 niklas 105: another interface than the one naturally chosen by
106: .Xr connect 2 .
1.12 aaron 107: This can be useful when connecting to services which use IP addresses
1.3 niklas 108: for authentication and reconfiguration of the server is undesirable (or
109: impossible).
1.1 deraadt 110: .It Fl c
111: Disables the reading of the user's
112: .Pa \&.telnetrc
1.22 aaron 113: file.
114: (See the
1.1 deraadt 115: .Ic toggle skiprc
116: command on this man page.)
117: .It Fl d
118: Sets the initial value of the
119: .Ic debug
120: toggle to
1.12 aaron 121: .Dv TRUE .
1.38 jmc 122: .It Fl E
123: Stops any character from being recognized as an escape character.
1.16 aaron 124: .It Fl e Ar escapechar
1.1 deraadt 125: Sets the initial
126: .Nm
127: escape character to
1.33 jmc 128: .Ar escapechar .
1.1 deraadt 129: If
1.8 deraadt 130: .Ar escapechar
1.1 deraadt 131: is omitted, then
132: there will be no escape character.
1.38 jmc 133: .It Fl F
134: If Kerberos authentication is being used, the
135: .Fl F
136: option allows the local credentials to be forwarded
137: to the remote system, including any credentials that
138: have already been forwarded into the local environment.
1.1 deraadt 139: .It Fl f
1.34 jmc 140: If Kerberos authentication is being used, the
1.1 deraadt 141: .Fl f
142: option allows the local credentials to be forwarded to the remote system.
1.38 jmc 143: .It Fl K
144: Specifies no automatic login to the remote system.
1.1 deraadt 145: .It Fl k Ar realm
146: If Kerberos authentication is being used, the
147: .Fl k
1.12 aaron 148: option requests that
1.22 aaron 149: .Nm
1.12 aaron 150: obtain tickets for the remote host in
1.8 deraadt 151: realm
152: .Ar realm
1.34 jmc 153: instead of the remote host's realm.
1.38 jmc 154: .It Fl L
155: Specifies an 8-bit data path on output.
156: This causes the BINARY option to be negotiated on output.
1.16 aaron 157: .It Fl l Ar user
1.1 deraadt 158: When connecting to the remote system, if the remote system
159: understands the
160: .Ev ENVIRON
161: option, then
162: .Ar user
163: will be sent to the remote system as the value for the variable USER.
164: This option implies the
165: .Fl a
166: option.
167: This option may also be used with the
168: .Ic open
169: command.
1.16 aaron 170: .It Fl n Ar tracefile
1.1 deraadt 171: Opens
172: .Ar tracefile
173: for recording trace information.
174: See the
175: .Ic set tracefile
176: command below.
177: .It Fl r
178: Specifies a user interface similar to
1.30 millert 179: .Nm rlogin .
1.1 deraadt 180: In this
181: mode, the escape character is set to the tilde (~) character,
1.8 deraadt 182: unless modified by the
183: .Fl e
184: option.
1.43 guenther 185: .It Fl V Ar rtable
186: Set the routing table to be used.
1.38 jmc 187: .It Fl X Ar authtype
188: Disables the
189: .Ar authtype
190: type of authentication.
1.1 deraadt 191: .It Fl x
1.33 jmc 192: Turn on encryption of the data stream.
193: When this option is turned on,
1.29 hin 194: .Nm
195: will exit with an error if authentication cannot be negotiated or if
196: encryption cannot be turned on.
1.1 deraadt 197: .It Ar host
198: Indicates the official name, an alias, or the Internet address
199: of a remote host.
200: .It Ar port
1.22 aaron 201: Indicates a port number (address of an application).
202: If a number is not specified, the default
203: .Nm
1.1 deraadt 204: port is used.
205: .El
206: .Pp
1.36 jmc 207: When in rlogin mode, a line of the form ~.\&
1.22 aaron 208: disconnects from the
1.1 deraadt 209: remote host; ~ is the telnet escape character.
210: Similarly, the line ~^Z suspends the telnet session.
211: The line ~^] escapes to the normal telnet escape prompt.
212: .Pp
213: Once a connection has been opened,
1.22 aaron 214: .Nm
1.1 deraadt 215: will attempt to enable the
216: .Dv TELNET LINEMODE
217: option.
1.12 aaron 218: If this fails,
1.22 aaron 219: .Nm
1.1 deraadt 220: will revert to one of two input modes:
1.12 aaron 221: either ``character at a time''
222: or ``old line by line''
1.1 deraadt 223: depending on what the remote system supports.
224: .Pp
1.16 aaron 225: When
1.1 deraadt 226: .Dv LINEMODE
227: is enabled, character processing is done on the
1.22 aaron 228: local system, under the control of the remote system.
229: When input
1.1 deraadt 230: editing or character echoing is to be disabled, the remote system
1.22 aaron 231: will relay that information.
232: The remote system will also relay
1.1 deraadt 233: changes to any special characters that happen on the remote
234: system, so that they can take effect on the local system.
235: .Pp
1.12 aaron 236: In ``character at a time'' mode, most
1.1 deraadt 237: text typed is immediately sent to the remote host for processing.
238: .Pp
1.12 aaron 239: In ``old line by line'' mode, all text is echoed locally,
1.1 deraadt 240: and (normally) only completed lines are sent to the remote host.
1.12 aaron 241: The ``local echo character'' (initially ``^E'') may be used
1.1 deraadt 242: to turn off and on the local echo
243: (this would mostly be used to enter passwords
244: without the password being echoed).
245: .Pp
1.16 aaron 246: If the
1.1 deraadt 247: .Dv LINEMODE
248: option is enabled, or if the
249: .Ic localchars
250: toggle is
251: .Dv TRUE
1.12 aaron 252: (the default for ``old line by line''; see below),
1.1 deraadt 253: the user's
1.12 aaron 254: .Ic quit ,
1.1 deraadt 255: .Ic intr ,
256: and
257: .Ic flush
1.46 schwarze 258: characters are trapped locally, and sent as TELNET
1.1 deraadt 259: protocol sequences to the remote side.
1.16 aaron 260: If
1.1 deraadt 261: .Dv LINEMODE
262: has ever been enabled, then the user's
263: .Ic susp
264: and
265: .Ic eof
1.46 schwarze 266: are also sent as TELNET protocol sequences, and
1.1 deraadt 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
1.46 schwarze 280: (until the remote host acknowledges the TELNET
1.1 deraadt 281: sequence) and flush previous terminal input
282: (in the case of
283: .Ic quit
284: and
1.22 aaron 285: .Ic intr ) .
1.1 deraadt 286: .Pp
287: While connected to a remote host,
1.22 aaron 288: .Nm
1.1 deraadt 289: command mode may be entered by typing the
1.22 aaron 290: .Nm
1.12 aaron 291: ``escape character'' (initially ``^]'').
1.1 deraadt 292: When in command mode, the normal terminal editing conventions are available.
1.15 aaron 293: Note that the escape character will return to the command mode of the initial
1.18 alex 294: invocation of
1.22 aaron 295: .Nm
1.23 aaron 296: that has the controlling terminal.
297: Use the
1.15 aaron 298: .Cm send escape
299: command to switch to command mode in subsequent
1.22 aaron 300: .Nm
1.15 aaron 301: processes on remote hosts.
1.1 deraadt 302: .Pp
303: The following
1.22 aaron 304: .Nm
1.1 deraadt 305: commands are available.
306: Only enough of each command to uniquely identify it need be typed
307: (this is also true for arguments to the
1.12 aaron 308: .Ic mode ,
1.1 deraadt 309: .Ic set ,
1.12 aaron 310: .Ic toggle ,
1.1 deraadt 311: .Ic unset ,
1.12 aaron 312: .Ic slc ,
1.1 deraadt 313: .Ic environ ,
314: and
315: .Ic display
316: commands).
317: .Bl -tag -width "mode type"
1.40 sobrado 318: .It Ic auth Ar argument ...
1.12 aaron 319: The
320: .Ic auth
321: command manipulates the information sent through the
1.1 deraadt 322: .Dv TELNET AUTHENTICATE
1.22 aaron 323: option.
324: Valid arguments for the
325: .Ic auth
326: command are as follows:
1.1 deraadt 327: .Bl -tag -width "disable type"
328: .It Ic disable Ar type
1.12 aaron 329: Disables the specified
330: .Ar type
1.22 aaron 331: of authentication.
332: To obtain a list of available types, use the
1.35 jmc 333: .Ic auth disable ?\&
1.1 deraadt 334: command.
335: .It Ic enable Ar type
1.12 aaron 336: Enables the specified
337: .Ar type
1.22 aaron 338: of authentication.
339: To obtain a list of available types, use the
1.35 jmc 340: .Ic auth enable ?\&
1.1 deraadt 341: command.
342: .It Ic status
343: Lists the current status of the various types of
344: authentication.
345: .El
346: .It Ic close
1.46 schwarze 347: Close a TELNET session and return to command mode.
1.40 sobrado 348: .It Ic display Ar argument ...
1.1 deraadt 349: Displays all, or some, of the
350: .Ic set
351: and
352: .Ic toggle
353: values (see below).
1.40 sobrado 354: .It Ic encrypt Ar argument ...
1.12 aaron 355: The
356: .Ic encrypt
357: command manipulates the information sent through the
1.1 deraadt 358: .Dv TELNET ENCRYPT
1.28 hin 359: option that's available when Kerberos is used.
1.14 aaron 360: .Pp
1.1 deraadt 361: Valid arguments for the encrypt command are as follows:
362: .Bl -tag -width Ar
363: .It Ic disable Ar type Ic [input|output]
1.12 aaron 364: Disables the specified
365: .Ar type
1.22 aaron 366: of encryption.
367: If you omit
1.12 aaron 368: .Ic input
369: and
370: .Ic output ,
371: both input and output
1.22 aaron 372: are disabled.
373: To obtain a list of available types, use the
1.35 jmc 374: .Ic encrypt disable ?\&
1.1 deraadt 375: command.
376: .It Ic enable Ar type Ic [input|output]
1.12 aaron 377: Enables the specified
378: .Ar type
1.22 aaron 379: of encryption.
380: If you omit
1.12 aaron 381: .Ic input
382: and
383: .Ic output ,
384: both input and output are
1.22 aaron 385: enabled.
386: To obtain a list of available types, use the
1.35 jmc 387: .Ic encrypt enable ?\&
1.1 deraadt 388: command.
389: .It Ic input
390: This is the same as the
391: .Ic encrypt start input
392: command.
393: .It Ic -input
394: This is the same as the
395: .Ic encrypt stop input
396: command.
397: .It Ic output
398: This is the same as the
399: .Ic encrypt start output
400: command.
401: .It Ic -output
402: This is the same as the
403: .Ic encrypt stop output
404: command.
405: .It Ic start Ic [input|output]
1.22 aaron 406: Attempts to start encryption.
407: If you omit
1.1 deraadt 408: .Ic input
409: and
1.24 aaron 410: .Ic output ,
1.22 aaron 411: both input and output are enabled.
412: To obtain a list of available types, use the
1.35 jmc 413: .Ic encrypt enable ?\&
1.1 deraadt 414: command.
415: .It Ic status
416: Lists the current status of encryption.
417: .It Ic stop Ic [input|output]
1.22 aaron 418: Stops encryption.
419: If you omit
1.12 aaron 420: .Ic input
421: and
422: .Ic output ,
1.1 deraadt 423: encryption is on both input and output.
424: .It Ic type Ar type
425: Sets the default type of encryption to be used
426: with later
427: .Ic encrypt start
428: or
429: .Ic encrypt stop
430: commands.
431: .El
1.40 sobrado 432: .It Ic environ Ar argument ...
1.1 deraadt 433: The
434: .Ic environ
435: command is used to manipulate the
1.11 deraadt 436: variables that may be sent through the
1.1 deraadt 437: .Dv TELNET ENVIRON
438: option.
439: The initial set of variables is taken from the users
440: environment, with only the
441: .Ev DISPLAY
442: and
443: .Ev PRINTER
444: variables being exported by default.
445: The
446: .Ev USER
447: variable is also exported if the
448: .Fl a
449: or
450: .Fl l
451: options are used.
1.38 jmc 452: .Pp
1.1 deraadt 453: Valid arguments for the
454: .Ic environ
455: command are:
456: .Bl -tag -width Fl
1.16 aaron 457: .It Ic define Ar variable value
1.1 deraadt 458: Define the variable
459: .Ar variable
460: to have a value of
1.12 aaron 461: .Ar value .
1.1 deraadt 462: Any variables defined by this command are automatically exported.
463: The
464: .Ar value
465: may be enclosed in single or double quotes so
466: that tabs and spaces may be included.
1.16 aaron 467: .It Ic undefine Ar variable
1.1 deraadt 468: Remove
469: .Ar variable
470: from the list of environment variables.
1.16 aaron 471: .It Ic export Ar variable
1.1 deraadt 472: Mark the variable
473: .Ar variable
474: to be exported to the remote side.
1.16 aaron 475: .It Ic unexport Ar variable
1.1 deraadt 476: Mark the variable
477: .Ar variable
478: to not be exported unless
479: explicitly asked for by the remote side.
480: .It Ic list
481: List the current set of environment variables.
482: Those marked with a
483: .Cm *
484: will be sent automatically,
485: other variables will only be sent if explicitly requested.
486: .It Ic \&?
487: Prints out help information for the
488: .Ic environ
489: command.
490: .El
491: .It Ic logout
492: Sends the
493: .Dv TELNET LOGOUT
494: option to the remote side.
495: This command is similar to a
496: .Ic close
497: command; however, if the remote side does not support the
498: .Dv LOGOUT
499: option, nothing happens.
500: If, however, the remote side does support the
501: .Dv LOGOUT
1.46 schwarze 502: option, this command should cause the remote side to close the TELNET
1.1 deraadt 503: connection.
504: If the remote side also supports the concept of
505: suspending a user's session for later reattachment,
506: the logout argument indicates that you
507: should terminate the session immediately.
1.16 aaron 508: .It Ic mode Ar type
1.12 aaron 509: .Ar type
1.46 schwarze 510: is one of several options, depending on the state of the TELNET
1.1 deraadt 511: session.
512: The remote host is asked for permission to go into the requested mode.
513: If the remote host is capable of entering that mode, the requested
514: mode will be entered.
515: .Bl -tag -width Ar
516: .It Ic character
517: Disable the
518: .Dv TELNET LINEMODE
519: option, or, if the remote side does not understand the
520: .Dv LINEMODE
1.12 aaron 521: option, then enter ``character at a time'' mode.
1.1 deraadt 522: .It Ic line
523: Enable the
524: .Dv TELNET LINEMODE
525: option, or, if the remote side does not understand the
526: .Dv LINEMODE
1.12 aaron 527: option, then attempt to enter ``old-line-by-line'' mode.
1.16 aaron 528: .It Ic isig Pq Ic \-isig
529: Attempt to enable (disable) the
1.1 deraadt 530: .Dv TRAPSIG
1.16 aaron 531: mode of the
1.1 deraadt 532: .Dv LINEMODE
533: option.
1.16 aaron 534: This requires that the
1.1 deraadt 535: .Dv LINEMODE
536: option be enabled.
1.16 aaron 537: .It Ic edit Pq Ic \-edit
538: Attempt to enable (disable) the
1.1 deraadt 539: .Dv EDIT
1.16 aaron 540: mode of the
1.1 deraadt 541: .Dv LINEMODE
542: option.
1.16 aaron 543: This requires that the
1.1 deraadt 544: .Dv LINEMODE
545: option be enabled.
1.16 aaron 546: .It Ic softtabs Pq Ic \-softtabs
547: Attempt to enable (disable) the
1.1 deraadt 548: .Dv SOFT_TAB
1.16 aaron 549: mode of the
1.1 deraadt 550: .Dv LINEMODE
551: option.
1.16 aaron 552: This requires that the
1.1 deraadt 553: .Dv LINEMODE
554: option be enabled.
1.16 aaron 555: .It Ic litecho Pq Ic \-litecho
556: Attempt to enable (disable) the
1.1 deraadt 557: .Dv LIT_ECHO
1.16 aaron 558: mode of the
1.1 deraadt 559: .Dv LINEMODE
560: option.
1.16 aaron 561: This requires that the
1.1 deraadt 562: .Dv LINEMODE
563: option be enabled.
564: .It Ic \&?
565: Prints out help information for the
566: .Ic mode
567: command.
568: .El
569: .It Xo
570: .Ic open Ar host
1.5 deraadt 571: .Op Fl l Ar user
572: .Oo Op Fl
1.1 deraadt 573: .Ar port Oc
574: .Xc
575: Open a connection to the named host.
576: If no port number
577: is specified,
1.22 aaron 578: .Nm
1.46 schwarze 579: will attempt to contact a TELNET server at the default port.
1.1 deraadt 580: The host specification may be either a host name (see
1.7 deraadt 581: .Xr hosts 5 )
1.12 aaron 582: or an Internet address specified in the ``dot notation'' (see
1.48 ! jmc 583: .Xr inet_net 3 ) .
1.1 deraadt 584: The
1.5 deraadt 585: .Fl l
1.1 deraadt 586: option may be used to specify the user name
587: to be passed to the remote system via the
588: .Ev ENVIRON
589: option.
590: When connecting to a non-standard port,
1.22 aaron 591: .Nm
1.46 schwarze 592: omits any automatic initiation of TELNET options.
1.22 aaron 593: When the port number is preceded by a minus sign,
1.1 deraadt 594: the initial option negotiation is done.
595: After establishing a connection, the file
596: .Pa \&.telnetrc
597: in the
1.22 aaron 598: user's home directory is opened.
599: Lines beginning with a ``#'' are
600: comment lines.
601: Blank lines are ignored.
602: Lines that begin
603: without whitespace are the start of a machine entry.
604: The first thing on the line is the name of the machine that is
605: being connected to.
606: The rest of the line, and successive
1.21 aaron 607: lines that begin with whitespace are assumed to be
1.22 aaron 608: .Nm
1.1 deraadt 609: commands and are processed as if they had been typed
610: in manually to the
1.22 aaron 611: .Nm
1.1 deraadt 612: command prompt.
613: .It Ic quit
1.46 schwarze 614: Close any open TELNET session and exit
1.12 aaron 615: .Nm telnet .
616: An end-of-file (in command mode) will also close a session and exit.
1.40 sobrado 617: .It Ic send Ar argument ...
1.1 deraadt 618: Sends one or more special character sequences to the remote host.
619: The following are the arguments which may be specified
620: (more than one argument may be specified at a time):
621: .Bl -tag -width escape
622: .It Ic abort
623: Sends the
624: .Dv TELNET ABORT
625: (Abort
626: processes)
627: sequence.
628: .It Ic ao
629: Sends the
630: .Dv TELNET AO
631: (Abort Output) sequence, which should cause the remote system to flush
632: all output
633: .Em from
634: the remote system
635: .Em to
636: the user's terminal.
637: .It Ic ayt
638: Sends the
639: .Dv TELNET AYT
640: (Are You There)
641: sequence, to which the remote system may or may not choose to respond.
642: .It Ic brk
643: Sends the
644: .Dv TELNET BRK
645: (Break) sequence, which may have significance to the remote
646: system.
647: .It Ic ec
648: Sends the
649: .Dv TELNET EC
650: (Erase Character)
651: sequence, which should cause the remote system to erase the last character
652: entered.
653: .It Ic el
654: Sends the
655: .Dv TELNET EL
656: (Erase Line)
657: sequence, which should cause the remote system to erase the line currently
658: being entered.
659: .It Ic eof
660: Sends the
661: .Dv TELNET EOF
662: (End Of File)
663: sequence.
664: .It Ic eor
665: Sends the
666: .Dv TELNET EOR
667: (End of Record)
668: sequence.
669: .It Ic escape
670: Sends the current
1.22 aaron 671: .Nm
1.12 aaron 672: escape character (initially ``^]'').
1.1 deraadt 673: .It Ic ga
674: Sends the
675: .Dv TELNET GA
676: (Go Ahead)
677: sequence, which likely has no significance to the remote system.
678: .It Ic getstatus
679: If the remote side supports the
680: .Dv TELNET STATUS
681: command,
682: .Ic getstatus
683: will send the subnegotiation to request that the server send
684: its current option status.
685: .It Ic ip
686: Sends the
687: .Dv TELNET IP
688: (Interrupt Process) sequence, which should cause the remote
689: system to abort the currently running process.
690: .It Ic nop
691: Sends the
692: .Dv TELNET NOP
693: (No OPeration)
694: sequence.
695: .It Ic susp
696: Sends the
697: .Dv TELNET SUSP
698: (SUSPend process)
699: sequence.
700: .It Ic synch
701: Sends the
702: .Dv TELNET SYNCH
703: sequence.
704: This sequence causes the remote system to discard all previously typed
705: (but not yet read) input.
1.46 schwarze 706: This sequence is sent as TCP urgent
1.1 deraadt 707: data (and may not work if the remote system is a
708: .Bx 4.2
709: system -- if
1.12 aaron 710: it doesn't work, a lower case ``r'' may be echoed on the terminal).
1.1 deraadt 711: .It Ic do Ar cmd
1.12 aaron 712: Sends the
713: .Dv TELNET DO
714: .Ar cmd
715: sequence.
716: .Ar cmd
717: can be either a decimal number between 0 and 255,
1.46 schwarze 718: or a symbolic name for a specific TELNET command.
1.12 aaron 719: .Ar cmd
720: can also be either
721: .Ic help
722: or
1.35 jmc 723: .Ic ?\&
1.12 aaron 724: to print out help information, including
725: a list of known symbolic names.
1.1 deraadt 726: .It Ic dont Ar cmd
1.12 aaron 727: Sends the
728: .Dv TELNET DONT
729: .Ar cmd
730: sequence.
731: .Ar cmd
732: can be either a decimal number between 0 and 255,
1.46 schwarze 733: or a symbolic name for a specific TELNET command.
1.12 aaron 734: .Ar cmd
735: can also be either
736: .Ic help
737: or
1.35 jmc 738: .Ic ?\&
1.12 aaron 739: to print out help information, including
740: a list of known symbolic names.
1.1 deraadt 741: .It Ic will Ar cmd
1.12 aaron 742: Sends the
743: .Dv TELNET WILL
744: .Ar cmd
745: sequence.
746: .Ar cmd
747: can be either a decimal number between 0 and 255,
1.46 schwarze 748: or a symbolic name for a specific TELNET command.
1.12 aaron 749: .Ar cmd
750: can also be either
751: .Ic help
752: or
1.35 jmc 753: .Ic ?\&
1.12 aaron 754: to print out help information, including
755: a list of known symbolic names.
1.1 deraadt 756: .It Ic wont Ar cmd
757: Sends the
1.12 aaron 758: .Dv TELNET WONT
1.1 deraadt 759: .Ar cmd
760: sequence.
1.12 aaron 761: .Ar cmd
1.1 deraadt 762: can be either a decimal number between 0 and 255,
1.46 schwarze 763: or a symbolic name for a specific TELNET command.
1.12 aaron 764: .Ar cmd
1.1 deraadt 765: can also be either
766: .Ic help
767: or
1.35 jmc 768: .Ic ?\&
1.1 deraadt 769: to print out help information, including
770: a list of known symbolic names.
771: .It Ic \&?
772: Prints out help information for the
773: .Ic send
774: command.
775: .El
1.16 aaron 776: .It Ic set Ar argument value
777: .It Ic unset Ar argument value
1.1 deraadt 778: The
779: .Ic set
780: command will set any one of a number of
1.22 aaron 781: .Nm
1.1 deraadt 782: variables to a specific value or to
783: .Dv TRUE .
784: The special value
785: .Ic off
786: turns off the function associated with
1.12 aaron 787: the variable; this is equivalent to using the
1.1 deraadt 788: .Ic unset
789: command.
790: The
791: .Ic unset
792: command will disable or set to
793: .Dv FALSE
794: any of the specified functions.
795: The values of variables may be interrogated with the
796: .Ic display
797: command.
798: The variables which may be set or unset, but not toggled, are
1.22 aaron 799: listed here.
800: In addition, any of the variables for the
1.1 deraadt 801: .Ic toggle
802: command may be explicitly set or unset using
803: the
804: .Ic set
805: and
806: .Ic unset
807: commands.
808: .Bl -tag -width escape
809: .It Ic ayt
1.46 schwarze 810: If TELNET is in
1.12 aaron 811: .Ic localchars
812: mode, or
1.1 deraadt 813: .Dv LINEMODE
814: is enabled, and the status character is typed, a
815: .Dv TELNET AYT
816: sequence (see
817: .Ic send ayt
818: preceding) is sent to the
1.22 aaron 819: remote host.
820: The initial value for the "Are You There"
1.1 deraadt 821: character is the terminal's status character.
822: .It Ic echo
1.12 aaron 823: This is the value (initially ``^E'') which, when in
824: ``line by line'' mode, toggles between doing local echoing
1.1 deraadt 825: of entered characters (for normal processing), and suppressing
826: echoing of entered characters (for entering, say, a password).
827: .It Ic eof
828: If
1.22 aaron 829: .Nm
1.1 deraadt 830: is operating in
831: .Dv LINEMODE
1.12 aaron 832: or ``old line by line'' mode, entering this character
1.1 deraadt 833: as the first character on a line will cause this character to be
834: sent to the remote system.
1.12 aaron 835: The initial value of the
836: .Ic eof
837: character is taken to be the terminal's
1.1 deraadt 838: .Ic eof
839: character.
840: .It Ic erase
841: If
1.22 aaron 842: .Nm
1.1 deraadt 843: is in
844: .Ic localchars
845: mode (see
846: .Ic toggle
847: .Ic localchars
848: below),
1.12 aaron 849: and if
1.22 aaron 850: .Nm
1.12 aaron 851: is operating in ``character at a time'' mode, then when this
1.1 deraadt 852: character is typed, a
853: .Dv TELNET EC
854: sequence (see
855: .Ic send
856: .Ic ec
857: above)
858: is sent to the remote system.
1.12 aaron 859: The initial value for the
860: .Ic erase
861: character is taken to be
1.1 deraadt 862: the terminal's
863: .Ic erase
864: character.
865: .It Ic escape
866: This is the
1.22 aaron 867: .Nm
1.12 aaron 868: escape character (initially ``^['') which causes entry
1.1 deraadt 869: into
1.22 aaron 870: .Nm
1.1 deraadt 871: command mode (when connected to a remote system).
872: .It Ic flushoutput
873: If
1.22 aaron 874: .Nm
1.1 deraadt 875: is in
876: .Ic localchars
877: mode (see
878: .Ic toggle
879: .Ic localchars
880: below)
881: and the
882: .Ic flushoutput
883: character is typed, a
884: .Dv TELNET AO
885: sequence (see
886: .Ic send
887: .Ic ao
888: above)
889: is sent to the remote host.
1.12 aaron 890: The initial value for the
891: .Ic flush
892: character is taken to be
1.1 deraadt 893: the terminal's
894: .Ic flush
895: character.
896: .It Ic forw1
897: .It Ic forw2
1.46 schwarze 898: If TELNET is operating in
1.1 deraadt 899: .Dv LINEMODE ,
900: these are the
901: characters that, when typed, cause partial lines to be
1.22 aaron 902: forwarded to the remote system.
903: The initial value for
1.1 deraadt 904: the forwarding characters are taken from the terminal's
905: eol and eol2 characters.
906: .It Ic interrupt
907: If
1.22 aaron 908: .Nm
1.1 deraadt 909: is in
910: .Ic localchars
911: mode (see
912: .Ic toggle
913: .Ic localchars
914: below)
915: and the
916: .Ic interrupt
917: character is typed, a
918: .Dv TELNET IP
919: sequence (see
920: .Ic send
921: .Ic ip
922: above)
923: is sent to the remote host.
1.12 aaron 924: The initial value for the
925: .Ic interrupt
926: character is taken to be
1.1 deraadt 927: the terminal's
928: .Ic intr
929: character.
930: .It Ic kill
931: If
1.22 aaron 932: .Nm
1.1 deraadt 933: is in
934: .Ic localchars
935: mode (see
936: .Ic toggle
937: .Ic localchars
938: below),
1.12 aaron 939: and if
1.22 aaron 940: .Nm
1.12 aaron 941: is operating in ``character at a time'' mode, then when this
1.1 deraadt 942: character is typed, a
943: .Dv TELNET EL
944: sequence (see
945: .Ic send
946: .Ic el
947: above)
948: is sent to the remote system.
1.12 aaron 949: The initial value for the
950: .Ic kill
951: character is taken to be
1.1 deraadt 952: the terminal's
953: .Ic kill
954: character.
955: .It Ic lnext
956: If
1.22 aaron 957: .Nm
1.1 deraadt 958: is operating in
959: .Dv LINEMODE
1.12 aaron 960: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 961: be the terminal's
962: .Ic lnext
963: character.
1.12 aaron 964: The initial value for the
965: .Ic lnext
966: character is taken to be
1.1 deraadt 967: the terminal's
968: .Ic lnext
969: character.
970: .It Ic quit
971: If
1.22 aaron 972: .Nm
1.1 deraadt 973: is in
974: .Ic localchars
975: mode (see
976: .Ic toggle
977: .Ic localchars
978: below)
979: and the
980: .Ic quit
981: character is typed, a
982: .Dv TELNET BRK
983: sequence (see
984: .Ic send
985: .Ic brk
986: above)
987: is sent to the remote host.
1.12 aaron 988: The initial value for the
989: .Ic quit
990: character is taken to be
1.1 deraadt 991: the terminal's
992: .Ic quit
993: character.
994: .It Ic reprint
995: If
1.22 aaron 996: .Nm
1.1 deraadt 997: is operating in
998: .Dv LINEMODE
1.31 deraadt 999: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1000: be the terminal's
1001: .Ic reprint
1002: character.
1.12 aaron 1003: The initial value for the
1004: .Ic reprint
1005: character is taken to be
1.1 deraadt 1006: the terminal's
1007: .Ic reprint
1008: character.
1009: .It Ic rlogin
1010: This is the rlogin escape character.
1.46 schwarze 1011: If set, the normal TELNET
1.1 deraadt 1012: escape character is ignored unless it is
1013: preceded by this character at the beginning of a line.
1.12 aaron 1014: This character, at the beginning of a line, followed by
1015: a "." closes the connection; when followed by a ^Z it
1.5 deraadt 1016: suspends the
1.22 aaron 1017: .Nm
1018: command.
1019: The initial state is to
1.12 aaron 1020: disable the
1021: .Ic rlogin
1022: escape character.
1.1 deraadt 1023: .It Ic start
1024: If the
1025: .Dv TELNET TOGGLE-FLOW-CONTROL
1026: option has been enabled,
1027: then this character is taken to
1028: be the terminal's
1029: .Ic start
1030: character.
1.12 aaron 1031: The initial value for the
1032: .Ic start
1033: character is taken to be
1.1 deraadt 1034: the terminal's
1035: .Ic start
1036: character.
1037: .It Ic stop
1038: If the
1039: .Dv TELNET TOGGLE-FLOW-CONTROL
1040: option has been enabled,
1041: then this character is taken to
1042: be the terminal's
1043: .Ic stop
1044: character.
1.12 aaron 1045: The initial value for the
1046: .Ic stop
1047: character is taken to be
1.1 deraadt 1048: the terminal's
1049: .Ic stop
1050: character.
1051: .It Ic susp
1052: If
1.22 aaron 1053: .Nm
1.1 deraadt 1054: is in
1055: .Ic localchars
1056: mode, or
1057: .Dv LINEMODE
1058: is enabled, and the
1059: .Ic suspend
1060: character is typed, a
1061: .Dv TELNET SUSP
1062: sequence (see
1063: .Ic send
1064: .Ic susp
1065: above)
1066: is sent to the remote host.
1.12 aaron 1067: The initial value for the
1068: .Ic suspend
1069: character is taken to be
1.1 deraadt 1070: the terminal's
1071: .Ic suspend
1072: character.
1073: .It Ic tracefile
1074: This is the file to which the output, caused by
1075: .Ic netdata
1076: or
1077: .Ic option
1078: tracing being
1079: .Dv TRUE ,
1.22 aaron 1080: will be written.
1081: If it is set to
1.1 deraadt 1082: .Dq Fl ,
1083: then tracing information will be written to standard output (the default).
1084: .It Ic worderase
1085: If
1.22 aaron 1086: .Nm
1.1 deraadt 1087: is operating in
1088: .Dv LINEMODE
1.12 aaron 1089: or ``old line by line'' mode, then this character is taken to
1.1 deraadt 1090: be the terminal's
1091: .Ic worderase
1092: character.
1.12 aaron 1093: The initial value for the
1094: .Ic worderase
1095: character is taken to be
1.1 deraadt 1096: the terminal's
1097: .Ic worderase
1098: character.
1099: .It Ic \&?
1100: Displays the legal
1101: .Ic set
1102: .Pq Ic unset
1103: commands.
1104: .El
1.17 aaron 1105: .It Ic skey Ar sequence challenge
1106: The
1107: .Ic skey
1.23 aaron 1108: command computes a response to the S/Key challenge.
1109: See
1.17 aaron 1110: .Xr skey 1
1111: for more information on the S/Key system.
1.16 aaron 1112: .It Ic slc Ar state
1.1 deraadt 1113: The
1114: .Ic slc
1115: command (Set Local Characters) is used to set
1.4 deraadt 1116: or change the state of the special
1.16 aaron 1117: characters when the
1.1 deraadt 1118: .Dv TELNET LINEMODE
1119: option has
1.22 aaron 1120: been enabled.
1.46 schwarze 1121: Special characters are characters that get mapped to TELNET
1.1 deraadt 1122: commands sequences (like
1123: .Ic ip
1124: or
1.22 aaron 1125: .Ic quit )
1.1 deraadt 1126: or line editing characters (like
1127: .Ic erase
1128: and
1.22 aaron 1129: .Ic kill ) .
1.1 deraadt 1130: By default, the local special characters are exported.
1131: .Bl -tag -width Fl
1132: .It Ic check
1133: Verify the current settings for the current special characters.
1134: The remote side is requested to send all the current special
1135: character settings, and if there are any discrepancies with
1136: the local side, the local side will switch to the remote value.
1137: .It Ic export
1.22 aaron 1138: Switch to the local defaults for the special characters.
1139: The local default characters are those of the local terminal at
1.1 deraadt 1140: the time when
1.22 aaron 1141: .Nm
1.1 deraadt 1142: was started.
1143: .It Ic import
1144: Switch to the remote defaults for the special characters.
1145: The remote default characters are those of the remote system
1.46 schwarze 1146: at the time when the TELNET connection was established.
1.1 deraadt 1147: .It Ic \&?
1148: Prints out help information for the
1149: .Ic slc
1150: command.
1151: .El
1152: .It Ic status
1153: Show the current status of
1.12 aaron 1154: .Nm telnet .
1.1 deraadt 1155: This includes the peer one is connected to, as well
1156: as the current mode.
1.40 sobrado 1157: .It Ic toggle Ar argument ...
1.1 deraadt 1158: Toggle (between
1159: .Dv TRUE
1160: and
1161: .Dv FALSE )
1162: various flags that control how
1.22 aaron 1163: .Nm
1.1 deraadt 1164: responds to events.
1165: These flags may be set explicitly to
1166: .Dv TRUE
1167: or
1168: .Dv FALSE
1169: using the
1170: .Ic set
1171: and
1172: .Ic unset
1173: commands listed above.
1174: More than one argument may be specified.
1175: The state of these flags may be interrogated with the
1176: .Ic display
1177: command.
1178: Valid arguments are:
1179: .Bl -tag -width Ar
1180: .It Ic authdebug
1181: Turns on debugging information for the authentication code.
1182: .It Ic autoflush
1183: If
1184: .Ic autoflush
1185: and
1186: .Ic localchars
1187: are both
1188: .Dv TRUE ,
1189: then when the
1.12 aaron 1190: .Ic ao
1.1 deraadt 1191: or
1192: .Ic quit
1.46 schwarze 1193: characters are recognized (and transformed into TELNET sequences; see
1.1 deraadt 1194: .Ic set
1195: above for details),
1.22 aaron 1196: .Nm
1.1 deraadt 1197: refuses to display any data on the user's terminal
1198: until the remote system acknowledges (via a
1199: .Dv TELNET TIMING MARK
1200: option)
1.46 schwarze 1201: that it has processed those TELNET sequences.
1.1 deraadt 1202: The initial value for this toggle is
1203: .Dv TRUE
1204: if the terminal user had not
1205: done an "stty noflsh", otherwise
1206: .Dv FALSE
1207: (see
1.22 aaron 1208: .Xr stty 1 ) .
1.1 deraadt 1209: .It Ic autodecrypt
1210: When the
1211: .Dv TELNET ENCRYPT
1212: option is negotiated, by
1213: default the actual encryption (decryption) of the data
1.22 aaron 1214: stream does not start automatically.
1215: The
1.12 aaron 1216: .Ic autoencrypt
1217: .Pq Ic autodecrypt
1218: command states that encryption of the
1.1 deraadt 1219: output (input) stream should be enabled as soon as
1220: possible.
1221: .It Ic autologin
1222: If the remote side supports the
1223: .Dv TELNET AUTHENTICATION
1.46 schwarze 1224: option TELNET attempts to use it to perform automatic authentication.
1.22 aaron 1225: If the
1.1 deraadt 1226: .Dv AUTHENTICATION
1227: option is not supported, the user's login
1.31 deraadt 1228: name is propagated through the
1.1 deraadt 1229: .Dv TELNET ENVIRON
1230: option.
1231: This command is the same as specifying
1232: .Ar a
1233: option on the
1234: .Ic open
1235: command.
1236: .It Ic autosynch
1237: If
1238: .Ic autosynch
1239: and
1240: .Ic localchars
1241: are both
1242: .Dv TRUE ,
1243: then when either the
1244: .Ic intr
1245: or
1246: .Ic quit
1.12 aaron 1247: character is typed (see
1.1 deraadt 1248: .Ic set
1249: above for descriptions of the
1250: .Ic intr
1251: and
1252: .Ic quit
1.46 schwarze 1253: characters), the resulting TELNET sequence sent is followed by the
1.1 deraadt 1254: .Dv TELNET SYNCH
1255: sequence.
1256: This procedure
1.12 aaron 1257: .Em should
1.1 deraadt 1258: cause the remote system to begin throwing away all previously
1.46 schwarze 1259: typed input until both of the TELNET
1.1 deraadt 1260: sequences have been read and acted upon.
1261: The initial value of this toggle is
1262: .Dv FALSE .
1263: .It Ic binary
1264: Enable or disable the
1265: .Dv TELNET BINARY
1266: option on both input and output.
1267: .It Ic inbinary
1268: Enable or disable the
1269: .Dv TELNET BINARY
1270: option on input.
1271: .It Ic outbinary
1272: Enable or disable the
1273: .Dv TELNET BINARY
1274: option on output.
1275: .It Ic crlf
1276: If this is
1277: .Dv TRUE ,
1278: then carriage returns will be sent as
1279: .Li <CR><LF> .
1280: If this is
1281: .Dv FALSE ,
1.31 deraadt 1282: then carriage returns will be sent as
1.1 deraadt 1283: .Li <CR><NUL> .
1284: The initial value for this toggle is
1285: .Dv FALSE .
1286: .It Ic crmod
1287: Toggle carriage return mode.
1288: When this mode is enabled, most carriage return characters received from
1289: the remote host will be mapped into a carriage return followed by
1290: a line feed.
1291: This mode does not affect those characters typed by the user, only
1292: those received from the remote host.
1293: This mode is not very useful unless the remote host
1.12 aaron 1294: only sends carriage return, but never line feeds.
1.1 deraadt 1295: The initial value for this toggle is
1296: .Dv FALSE .
1297: .It Ic debug
1.25 aaron 1298: Toggles socket level debugging (useful only to the superuser).
1.1 deraadt 1299: The initial value for this toggle is
1300: .Dv FALSE .
1301: .It Ic encdebug
1302: Turns on debugging information for the encryption code.
1303: .It Ic localchars
1304: If this is
1305: .Dv TRUE ,
1306: then the
1.12 aaron 1307: .Ic flush ,
1.1 deraadt 1308: .Ic interrupt ,
1.12 aaron 1309: .Ic quit ,
1.1 deraadt 1310: .Ic erase ,
1311: and
1312: .Ic kill
1313: characters (see
1314: .Ic set
1315: above) are recognized locally, and transformed into (hopefully) appropriate
1.46 schwarze 1316: TELNET control sequences
1.1 deraadt 1317: (respectively
1.12 aaron 1318: .Ic ao ,
1.1 deraadt 1319: .Ic ip ,
1.12 aaron 1320: .Ic brk ,
1.1 deraadt 1321: .Ic ec ,
1322: and
1.22 aaron 1323: .Ic el ;
1.1 deraadt 1324: see
1325: .Ic send
1326: above).
1327: The initial value for this toggle is
1328: .Dv TRUE
1.12 aaron 1329: in ``old line by line'' mode,
1.1 deraadt 1330: and
1331: .Dv FALSE
1.12 aaron 1332: in ``character at a time'' mode.
1.1 deraadt 1333: When the
1334: .Dv LINEMODE
1335: option is enabled, the value of
1336: .Ic localchars
1337: is ignored, and assumed to always be
1338: .Dv TRUE .
1339: If
1340: .Dv LINEMODE
1341: has ever been enabled, then
1342: .Ic quit
1343: is sent as
1.12 aaron 1344: .Ic abort ,
1345: and
1346: .Ic eof
1.1 deraadt 1347: and
1.5 deraadt 1348: .Ic suspend
1.1 deraadt 1349: are sent as
1.12 aaron 1350: .Ic eof
1351: and
1.5 deraadt 1352: .Ic susp
1353: (see
1.1 deraadt 1354: .Ic send
1355: above).
1356: .It Ic netdata
1357: Toggles the display of all network data (in hexadecimal format).
1358: The initial value for this toggle is
1359: .Dv FALSE .
1360: .It Ic options
1361: Toggles the display of some internal
1.22 aaron 1362: .Nm
1.46 schwarze 1363: protocol processing (having to do with TELNET options).
1.1 deraadt 1364: The initial value for this toggle is
1365: .Dv FALSE .
1366: .It Ic prettydump
1367: When the
1368: .Ic netdata
1369: toggle is enabled, if
1370: .Ic prettydump
1371: is enabled the output from the
1372: .Ic netdata
1373: command will be formatted in a more user readable format.
1374: Spaces are put between each character in the output, and the
1.46 schwarze 1375: beginning of any TELNET
1.1 deraadt 1376: escape sequence is preceded by a '*' to aid in locating them.
1377: .It Ic skiprc
1378: When the skiprc toggle is
1379: .Dv TRUE ,
1.46 schwarze 1380: TELNET skips the reading of the
1.1 deraadt 1381: .Pa \&.telnetrc
1.12 aaron 1382: file in the user's home
1.22 aaron 1383: directory when connections are opened.
1384: The initial value for this toggle is
1.13 aaron 1385: .Dv FALSE .
1.1 deraadt 1386: .It Ic termdata
1387: Toggles the display of all terminal data (in hexadecimal format).
1388: The initial value for this toggle is
1389: .Dv FALSE .
1390: .It Ic verbose_encrypt
1391: When the
1392: .Ic verbose_encrypt
1393: toggle is
1394: .Dv TRUE ,
1.22 aaron 1395: .Nm
1.1 deraadt 1396: prints out a message each time encryption is enabled or
1.22 aaron 1397: disabled.
1398: The initial value for this toggle is
1.13 aaron 1399: .Dv FALSE .
1.1 deraadt 1400: .It Ic \&?
1401: Displays the legal
1402: .Ic toggle
1403: commands.
1404: .El
1405: .It Ic z
1406: Suspend
1.12 aaron 1407: .Nm telnet .
1.1 deraadt 1408: This command only works when the user is using the
1.12 aaron 1409: .Xr csh 1 .
1.16 aaron 1410: .It Ic \&! Op Ar command
1.1 deraadt 1411: Execute a single command in a subshell on the local
1.22 aaron 1412: system.
1413: If
1.5 deraadt 1414: .Ar command
1.1 deraadt 1415: is omitted, then an interactive
1416: subshell is invoked.
1.16 aaron 1417: .It Ic \&? Op Ar command
1.22 aaron 1418: Get help.
1419: With no arguments,
1420: .Nm
1.1 deraadt 1421: prints a help summary.
1422: If a command is specified,
1.22 aaron 1423: .Nm
1.1 deraadt 1424: will print the help information for just that command.
1425: .El
1426: .Sh ENVIRONMENT
1.22 aaron 1427: .Nm
1.1 deraadt 1428: uses at least the
1429: .Ev HOME ,
1430: .Ev SHELL ,
1431: .Ev DISPLAY ,
1432: and
1433: .Ev TERM
1434: environment variables.
1435: Other environment variables may be propagated
1436: to the other side via the
1437: .Dv TELNET ENVIRON
1438: option.
1439: .Sh FILES
1440: .Bl -tag -width ~/.telnetrc -compact
1441: .It Pa ~/.telnetrc
1442: user customized telnet startup values
1443: .El
1.44 lum 1444: .Sh SEE ALSO
1445: .Xr ssh 1
1.1 deraadt 1446: .Sh HISTORY
1447: The
1.22 aaron 1448: .Nm
1.1 deraadt 1449: command appeared in
1450: .Bx 4.2 .
1451: .Sh NOTES
1452: On some remote systems, echo has to be turned off manually when in
1.12 aaron 1453: ``old line by line'' mode.
1.1 deraadt 1454: .Pp
1.16 aaron 1455: In ``old line by line'' mode or
1.1 deraadt 1456: .Dv LINEMODE
1457: the terminal's
1458: .Ic eof
1459: character is only recognized (and sent to the remote system)
1460: when it is the first character on a line.
1.20 itojun 1461: .Pp
1462: Source routing is not supported yet for IPv6.
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