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+Network Working Group J. Winett
+Request for Comments: 466 LL-67
+NIC: 14740 27 February 1973
+Category: TELNET
+
+
+ TELNET LOGGER/SERVER For Host LL-67
+
+ The attached writeup documents the TELNET LOGGER/SERVER for the
+ CP/CMS system on the Lincoln Laboratory 360>67 (host 10). The
+ facility serves both half duplex and full duplex TELNET users with
+ data in either ASCII or EBCDIC codes.
+
+ Use of the hide-your-input and noecho TELNET controls are used for
+ the EBCDIC print suppress (bypass) and print restore features during
+ the login procedure. To support half duplex terminals, the TELNET
+ control break (reverse break) is sent as an input prompt when input
+ is desired. This code can also be used to indicate that a previous
+ line sent without an end of line sequence (CR-LF) should be printed.
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+ This material has not been reviewed for public release and is
+ intended only for use with the ARPA network. It should not be quoted
+ or cited in any publication not related to the ARPA network.
+
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+Winett [Page 1]
+
+RFC 466 TELNET LOGGER/SERVER For Host LL-67 February 1973
+
+
+ Operation of the Lincoln Laboratory
+ CP/CMS TELNET LOGGER/SERVER
+
+ICP Connection
+
+ The TELNET LOGGER/SERVER follows the ICP protocol for making a pair
+ of connections. The LOGGER is initially enabled for a connection on
+ socket X'00000001'. When an RFC is received for this socket a pair
+ of sockets will be chosen for the TELNET connections. If the maximum
+ number of TELNET users which can be served are active, the initial
+ connection is refused. Currently, three TELNET users can be served.
+
+TELNET LOGGER
+
+ After the ICP connections have been setup, the LOGGER expects a
+ TELNET data type code, a string of network ASCII characters, or a
+ null line (just CR-LF) to indicate whether its operation should be in
+ ASCII or in EBCDIC character codes. ASCII is assumed unless the
+ first byte received is the TELNET EBCDIC data type code (X'A2). When
+ something has been received, the message:
+
+ Lincoln Laboratory CP/CMS Online
+
+ will be transmitted by the LOGGER. For example, if ASCII operation
+ is desired a null line (just CR-LF) transmitted on the send socket
+ will cause the welcoming message to be sent in ASCII. The CP login
+ procedure can then begin. If communications is desired to be carried
+ on with EBCDIC character codes, the first byte transmitted should be
+ the TELNET data type code for EBCDIC (X'A2'). Thereafter all
+ communications will be in the code originally used.
+
+ The CP login procedure expects the user to enter:
+
+ LOGIN userid
+
+ where the userid specifies the desired virtual machine. CP then
+ replies with:
+
+ ENTER PASSWORD:
+
+ followed by the EBCDIC code for bypass (x'24') which is mapped into
+ the TELNET code hide-your-input.
+
+ The user should then enter a password. Passwords entered from the
+ network may be different from those entered from a local terminal.
+ The LOGGER maps network passwords into a corresponding CP password.
+ Thus, access to an account can only be made from the network if a
+ network password, together with a CP password and userid, is entered
+
+
+
+Winett [Page 2]
+
+RFC 466 TELNET LOGGER/SERVER For Host LL-67 February 1973
+
+
+ into a file which is read by the LOGGER. If a userid entered from
+ the network is not in the LOGGER FILE (or if the network password
+ does not match the one included in the file for the specified userid)
+ the LOGGER passes an invalid userid (or password) to CP. The CP
+ response for an invalid userid or password is then sent to the
+ network user.
+
+ After a password is received by CP, CP transmits the EBCDIC code for
+ restore (X'14') which is mapped into the TELNET control noecho.
+
+TELNET SERVER
+
+ Since the CP/CMS system operates with EBCDIC codes, ASCII codes must
+ be translated into EBCDIC before being sent to a virtual machine.
+ Figure 1 gives the ASCII codes and their EBCDIC mapping. When the
+ ASCII sequence CR-LF is received, it is mapped into the EBCDIC code
+ NL. Whenever the TELNET control NOP is included in an input string,
+ it is mapped into an EBCDIC idle (X'17') and then removed from the
+ string. Thus, if TELNET NOP codes are included between a CR and LF,
+ they are removed before the CR-LF is mapped into the EBCDIC NL.
+
+ The TELNET control hide-your-input is mapped into the EBCDIC code for
+ bypass (X'24') and the TELNET control echo is mapped into the EBCDIC
+ control for restore (X'14'). If the TELNET control echo is received,
+ the SERVER should send the control noecho but this feature has not
+ yet been implemented. Instead, the TELNET control echo is mapped
+ into the EBCDIC code X'23'. If the TELNET break is received, it is
+ interpreted as an attention signal and the appropriate action is
+ taken by CP or CMS.
+
+ CP/CMS is a line at a time system and expects all input to consist of
+ lines ending with a NL code. Characters received are buffered until
+ the newline code is received.
+
+ Since CP/CMS is also a half duplex system, characters are only
+ examined when the system is expecting input. If the system is not
+ expecting input, a network interrupt is required to cause the SERVER
+ to process received characters. On receipt of a network interrupt,
+ characters received before the TELNET data mark is received are
+ examined and discarded, except that if a TELNET break code is found,
+ the appropriate CP/CMS interrupt action is stimulated.
+
+ On output, EBCDIC codes are mapped into network ASCII if a mapping
+ exists; otherwise, the codes are mapped into the TELNET control NOP.
+ A NL code is mapped into CR-LF. The EBCDIC code for bypass maps into
+ the TELNET control hide-your-input and the EBCDIC code for restore
+ maps into the TELNET control noecho. Also, the code X'23' maps into
+ the TELNET control echo and the code X'38' maps into the TELNET
+
+
+
+Winett [Page 3]
+
+RFC 466 TELNET LOGGER/SERVER For Host LL-67 February 1973
+
+
+ control break.
+
+ Since CP/CMS is a line at a time, half duplex system the TELNET
+ control break is transmitted as an end of message signal and also as
+ an input prompt code. If characters were output without a NL, the
+ break, as an end of message code, indicates to the user TELNET
+ operating on a line at a time mode that the characters previously
+ transmitted should be printed without waiting for the end of line
+ sequence. If the user TELNET is also operating in a half duplex
+ mode, the break as an input prompt indicates that the system is ready
+ for input.
+
+ If input had been anticipated and sent by a full duplex user TELNET,
+ the TELNET SERVER will have that input available for immediate
+ processing. Thus, in the case of a full duplex user TELNET the break
+ as a prompt should be ignored.
+
+ Though CP/CMS operates in a half duplex mode, it supports half duplex
+ terminals with the reverse break feature allowing the system to abort
+ an input mode in order to transmit a priority output message. In
+ this situation, the TELNET SERVER transmits a TELNET SYNC. A half
+ duplex user TELNET should interpret this by aborting the input mode,
+ i.e., revoking a previous TELNET break which was interpreted as an
+ input prompt.
+
+ No codes in the output character stream can cause the TELNET data
+ mark to be transmitted.
+
+LOGOUT
+
+ When a user logs out from his virtual machine, CP passes the
+ equivalent of a line disconnect to the LOGGER. The LOGGER then
+ closes the TELNET send and receive sockets.
+
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+Winett [Page 4]
+
+RFC 466 TELNET LOGGER/SERVER For Host LL-67 February 1973
+
+
+ ASCII ASCII ASCII SYMBOLS EBCDIC EBCDIC
+ DEC OCT HEX HEX DEC
+
+ 0 0 (00) NUL (00) 00
+ 1 1 (01) SOH (01) 01
+ 2 2 (02) STX (02) 02
+ 3 3 (03) ETX (03) 03
+ 4 4 (04) EOT (37) 55
+ 5 5 (05) ENQ (2D) 45
+ 6 6 (06) ACK (2E) 46
+ 7 7 (07) BEL (2F) 47
+ 8 10 (08) BS (16) 22
+ 9 11 (09) HT (05) 05
+ 10 12 (0A) LF (25) 37
+ 11 13 (0B) VT (0B) 11
+ 12 14 (0C) FF (0C) 12
+ 13 15 (0D) CR (0D) 13
+ 14 16 (0E) SO (0E) 14
+ 15 17 (0F) SI (0F) 15
+ 16 20 (10) DLE (10) 16
+ 17 21 (11) DC1 (11) 17
+ 18 22 (12) DC2 (12) 18
+ 19 23 (13) DC3 (13) 19
+ 20 24 (14) DC4 (3C) 60
+ 21 25 (15) NAK (3D) 61
+ 22 26 (16) SYN (32) 50
+ 23 27 (17) ETB (26) 38
+ 24 30 (18) CAN (18) 24
+ 25 31 (19) EM (19) 25
+ 26 32 (1A) SUB (3F) 63
+ 27 33 (1B) CTL (27) 39
+ 28 34 (1C) FS (1C) 28
+ 29 35 (1D) GS (1D) 29
+ 30 36 (1E) RS (1E) 30
+ 31 37 (1F) US (1F) 31
+
+ ASCII/EBCDIC Code Mappings
+ FIGURE 1
+
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+Winett [Page 5]
+
+RFC 466 TELNET LOGGER/SERVER For Host LL-67 February 1973
+
+
+ ASCII ASCII ASCII SYMBOLS EBCDIC EBCDIC
+ DEC OCT HEX HEX DEC
+
+ 32 40 (20) SP (40) 64
+ 33 41 (21) ! (5A) 90
+ 34 42 (22) " (7F) 127
+ 35 43 (23) # (7B) 123
+ 36 44 (24) $ (5B) 91
+ 37 45 (25) % (6C) 108
+ 38 46 (26) & (50) 80
+ 39 47 (27) ' (7D) 124
+ 40 50 (28) ( (4D) 77
+ 41 51 (29) ) (5D) 93
+ 42 52 (2A) * (5C) 92
+ 43 53 (2B) + (4E) 78
+ 44 54 (2C) , (6D) 109
+ 45 55 (2D) - (60) 96
+ 46 56 (2E) . (4B) 75
+ 47 57 (2F) / (61) 97
+ 48 60 (30) 0 (F0) 240
+ 49 61 (31) 1 (F1) 241
+ 50 62 (32) 2 (F2) 242
+ 51 63 (33) 3 (F3) 243
+ 52 64 (34) 4 (F4) 244
+ 53 65 (35) 5 (F5) 245
+ 54 66 (36) 6 (F6) 246
+ 55 67 (37) 7 (F7) 247
+ 56 70 (38) 8 (F8) 248
+ 57 71 (39) 9 (F9) 249
+ 58 72 (3A) : (7A) 122
+ 59 73 (3B) ; (5E) 94
+ 60 74 (3C) < (4C) 76
+ 61 75 (3D) = (7E) 126
+ 62 76 (3E) > (6E) 110
+ 63 77 (3F) ? (6F) 111
+
+ ASCII/EBCDIC Code Mappings
+ FIGURE 1 (CONTINUED)
+
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+Winett [Page 6]
+
+RFC 466 TELNET LOGGER/SERVER For Host LL-67 February 1973
+
+
+ ASCII ASCII ASCII SYMBOLS EBCDIC EBCDIC
+ DEC OCT HEX HEX DEC
+
+ 64 100 (40) @ (7C) 124
+ 65 101 (41) A (C1) 193
+ 66 102 (42) B (C2) 194
+ 67 103 (43) C (C3) 195
+ 68 104 (44) D (C4) 196
+ 69 105 (45) E (C5) 197
+ 70 106 (46) F (C6) 198
+ 71 107 (47) G (C7) 199
+ 72 110 (48) H (C8) 200
+ 73 111 (49) I (C9) 201
+ 74 112 (4A) J (D1) 209
+ 75 113 (4B) K (D2) 210
+ 76 114 (4C) L (D3) 211
+ 77 115 (4D) M (D4) 212
+ 78 116 (4E) N (D5) 213
+ 79 117 (4F) O (D6) 214
+ 80 120 (50) P (D7) 215
+ 81 121 (51) Q (D8) 216
+ 82 122 (52) R (D9) 217
+ 83 123 (53) S (E2) 226
+ 84 124 (54) T (E3) 227
+ 85 125 (55) U (E4) 228
+ 86 126 (56) V (E5) 229
+ 87 127 (57) W (E6) 230
+ 88 130 (58) X (E7) 231
+ 89 131 (59) Y (E8) 232
+ 90 132 (5A) Z (E9) 233
+ 91 133 (5B) [ (AD) 173
+ 92 134 (5C) <cent> (4A) 74 (BACK-SLASH)
+ 93 135 (5D) ] (BD) 189
+ 94 136 (5E) ^ (71) 113 (CARAT)
+ 95 137 (5F) _ (6D) 109
+
+ ASCII/EBCDIC Code Mappings
+ FIGURE 1 (CONTINUED)
+
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+Winett [Page 7]
+
+RFC 466 TELNET LOGGER/SERVER For Host LL-67 February 1973
+
+
+ ASCII ASCII ASCII SYMBOLS EBCDIC EBCDIC
+ DEC OCT HEX HEX DEC
+
+ 96 140 (60) ` (79) 121 (GRAVE)
+ 97 141 (61) a (81) 129
+ 98 142 (62) b (82) 130
+ 99 143 (63) c (83) 131
+ 100 144 (64) d (84) 132
+ 101 145 (65) e (85) 133
+ 102 146 (66) f (86) 134
+ 103 147 (67) g (87) 135
+ 104 150 (68) h (88) 136
+ 105 151 (69) i (89) 137
+ 106 152 (6A) j (91) 145
+ 107 153 (6B) k (92) 146
+ 108 154 (6C) l (93) 147
+ 109 155 (6D) m (94) 148
+ 110 156 (6E) n (95) 149
+ 111 157 (6F) o (96) 150
+ 112 160 (70) p (97) 151
+ 113 161 (71) q (98) 152
+ 114 162 (72) r (99) 153
+ 115 163 (73) s (A2) 162
+ 116 164 (74) t (A3) 163
+ 117 165 (75) u (A4) 164
+ 118 166 (76) v (A5) 165
+ 119 167 (77) w (A6) 166
+ 120 170 (78) x (A7) 167
+ 121 171 (79) y (A8) 168
+ 122 172 (7A) z (A9) 169
+ 123 173 (7B) { (8B) 139
+ 124 174 (7C) | (4F) 79 (BAR/OR)
+ 125 175 (7D) } (9B) 155
+ 126 176 (7E) <bent bar> (5F) 95 (TILDE/NOT)
+ 127 177 (7F) DEL (07) 7
+
+ ASCII ASCII ASCII TELNET EBCDIC EBCDIC
+ DEC OCT HEX CONTROLS HEX DEC
+
+ 128 100 (80) DATA-MARK (80) 128
+ 129 101 (81) BREAK (38) 56
+ 130 102 (82) NOP (17) 23 IDLE
+ 131 103 (83) NOECHO (14) 20 RESTORE
+ 132 104 (84) ECHO (23) 35
+ 133 105 (85) HIDE-YOUR INPUT (24) 36 BYPASS
+
+ ASCII/EBCDIC Code Mappings
+ FIGURE 1 (CONTINUED)
+
+
+
+Winett [Page 8]
+
+RFC 466 TELNET LOGGER/SERVER For Host LL-67 February 1973
+
+
+ [This RFC was put into machine readable form for entry]
+ [into the online RFC archives by Helene Morin, Via Genie, 12/99]
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+Winett [Page 9]
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