Synchronet v3.19b-Win32 (install) has been released (Jan-2022).

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server:terminal [2018/03/01 12:21] – old revision restored digital manserver:terminal [2024/03/04 20:42] (current) – [Configure] Updated SCFG screenshot for SSH digital man
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 ====== Terminal Server ====== ====== Terminal Server ======
-The Synchronet Terminal Server is responsible for providing that "old school" BBS user interface over dial-up modems and classic Internet console protocols (e.g. Telnet).+The Synchronet //Terminal Server// is responsible for providing that "old school" BBS user interface over dial-up modems and classic Internet console protocols (e.g. Telnet).
  
 ===== Features ===== ===== Features =====
  
-  * Supports ANSI X3.64 (color and monochrome), [[wp>Remote_imaging_protocol|RIP]], and dumb terminals +  * Supports ANSI X3.64 (color and monochrome), PETSCII, [[wp>Remote_imaging_protocol|RIP]], and dumb terminals 
-  * Supports [[wp>ASCII|US-ASCII]] and [[wp>Code_page_437|CP437]] (a.k.a. IBM Extended ASCII) character sets  +  * Supports [[wp>ASCII|US-ASCII]], [[wp>Code_page_437|CP437]] (a.k.a. IBM Extended ASCII), UTF-8 (UNICODE), and CBM/[[wp>PETSCII]] character sets  
-  * Supported Protocols: [[#Telnet]], [[#RLogin]], and [[#SSH]]+  * Supported Protocols: [[#Telnet]], [[#RLogin]], [[#SSH]], and raw TCP 
 + 
 +===== Configure ===== 
 + 
 +The Synchronet Terminal Server can be configured via [[util:SCFG]]:Servers->Terminal Server: 
 + 
 +<file> 
 +╔═══════════════════════════════════════════╗ 
 +║              Terminal Server              ║ 
 +╠═══════════════════════════════════════════╣ 
 +║ │Enabled                       Yes        ║ 
 +║ │Log Level                     Info       ║ 
 +║ │Serving Nodes                 1-4        ║ 
 +║ │SSH Support...                Port 22    ║ 
 +║ │Telnet Support...             Port 23    ║ 
 +║ │RLogin Support...             Port 513   ║ 
 +║ │40 Column PETSCII Support     Port 64    ║ 
 +║ │80 Column PETSCII Support     Port 128   ║ 
 +║ │DOS Program Support           Yes        ║ 
 +║ │Max Concurrent Connections    Unlimited  ║ 
 +║ │Max Login Inactivity          10 minutes ║ 
 +║ │Max New User Inactivity       1 hour     ║ 
 +║ │Max User Inactivity           10 minutes ║ 
 +║ │Output Buffer Drain Timeout   10 ms      ║ 
 +║ │Execute Timed Events          Yes        ║ 
 +║ │Execute QWK-related Events    Yes        ║ 
 +║ │Lookup Client Hostname        Yes        ║ 
 +║ │JavaScript Settings...                   ║ 
 +║ │Failed Login Attempts...                 ║ 
 +╚═══════════════════════════════════════════╝ 
 +</file> 
 + 
 +... or configured (on Windows) via [[monitor:SBBSCTRL]]:Telnet->Configure dialog 
 + 
 +{{:server:sbbsctrl.3.20.term.config.png}} 
 + 
 +... or configured by manually editing the ''[BBS]'' section of the ''[[dir:ctrl]]/[[config:sbbs.ini]]'' file 
 + 
 +===== Key Bindings ===== 
 + 
 +==== Global Ctrl-Keys ==== 
 + 
 +These control-key combinations have special purpose at almost any-time while using the Terminal Server: 
 + 
 +^ Ctrl-Key ^ Description ^ 
 +| Ctrl-K   | Display a Ctrl-key Menu | 
 +| Ctrl-C   | Stop the current process / listing / operation | 
 +| Ctrl-O   | Toggle auto-pause prompt temporarily | 
 +| Ctrl-Z   | Toggle raw input/output mode | 
 +| Ctrl-U   | List users online | 
 +| Ctrl-P   | Page for chat or send instant-message or telegram to users | 
 +| Ctrl-T   | Display current time information | 
 + 
 +Global control-keys are handled in sbbs_t::handle_ctrlkey(), called from sbbs_t::inkey() in ''inkey.cpp'' and exposed in JavaScript via console.inkey(). 
 + 
 +Global control key handling may be disabled/re-enabled (per key) programmatically via the JavaScript console.ctrlkey_passthru property: 
 + js.on_exit("console.ctrlkey_passthru = " + console.ctrlkey_passthru); 
 + console.ctrlkey_passthru|=(1<<16);      // Disable Ctrl-P handling in sbbs 
 + 
 +Custom global control-key handlers may be installed via [[util:SCFG]]->External Programs->Global Hot Key Events: 
 + 
 +<file> 
 +╔═══════════════════════════════════════════╗ 
 +║           Global Hot Key Events           ║ 
 +╠═══════════════════════════════════════════╣ 
 +║ │Ctrl-P    ?privatemsg.js                 ║ 
 +║ │Ctrl-U    ?nodelist.js -active           ║ 
 +║ │                                         ║ 
 +╚═══════════════════════════════════════════╝ 
 +</file> 
 +==== Line Input ==== 
 + 
 +Additional control-key combinations have special behavior during line (text string) input: 
 + 
 +^ Ctrl-Key ^ Description ^ 
 +| Ctrl-N   | Move to next word in line | 
 +| Ctrl-\   | Move to previous word in line | 
 +| Ctrl-D   | Delete word to the right | 
 +| Ctrl-W   | Delete word to the left | 
 +| Ctrl-Y   | Delete from the cursor to the end of the line | 
 +| Ctrl-X   | Delete the entire current line | 
 +| Ctrl-L   | Center the line and complete input | 
 +| Ctrl-Z   | Undo (revert edited line) | 
 +| Ctrl-R   | Redraw current line | 
 +| Ctrl-A   | Insert an [[custom:ctrl-a_codes|attribute code]] (when allowed) | 
 +| Ctrl-G   | Insert a beep character (when allowed) | 
 + 
 +The line/string input control-keys are handled via sbbs_t::getstr() in ''getstr.cpp'' and exposed in JavaScript via console.getstr(). 
 + 
 +==== Extended Keys ==== 
 + 
 +The Synchronet Terminal Server endeavors to support most extended-keys (e.g. home, end, arrow-keys, etc.) on most terminals while simultaneously supporting control-key equivalents for all terminals. 
 + 
 +^ Extended Key ^ Decimal ^ Hex ^ Ctrl-Key ^ ANSI((ANSI X3.64/ECMA-048 escape sequence)) ^ Other((e.g. VT-220 or XTerm escape sequence)) ^ Description (typical use) ^  
 +| Home         | 2       | 02  | Ctrl-B   | \e[H                    | \e[1~  | Move cursor to beginning of line or top of page/list/document | 
 +| End          | 5       | 05  | Ctrl-E   | \e[K and \e[F           | \e[4~  | Move cursor to end of line or bottom of page/list/document | 
 +| Up-arrow     | 30      | 1E  | Ctrl-Caret   | \e[A                    |        | Move cursor up one line or recall previous history item | 
 +| Down-arrow   | 10      | 0A  | Ctrl-J   | \e[B                    |        | Move cursor down one line or recall next history item | 
 +| Left-arrow   | 29      | 1D  | Ctrl-]   | \e[D                    |        | Move cursor to the left | 
 +| Right-arrow  | 6       | 06  | Ctrl-F   | \e[C                    |        | Move cursor to the right | 
 +| Page-up      | 16      | 10  | Ctrl-P   | \e[V                    | \e[5~  | Move cursor up one page | 
 +| Page-down    | 14      | 0E  | Ctrl-N   | \e[U                    | \e[6~  | Move cursor up one page | 
 +| Insert       | 22      | 16  | Ctrl-V   | \e[@                    | \e[2~  | Toggle insert/overwrite text mode | 
 +| Delete       | 127     | 7F  | Ctrl-?   |                         | \e[3~  | Delete character under cursor (delete-right), also Ctrl-Backspace |
  
-===== Configuration ===== 
  
-  * Configured via the ''[[dir:ctrl]]/[[config:sbbs.ini]]'' file 
-  * Optionally configured (on Windows) via [[monitor:SBBSCTRL]]:Telnet->Configure dialog 
-  * Configured behavior may be over-ridden via ''[[monitor:sbbscon|sbbs]]'' command-line arguments 
 ===== Telnet ===== ===== Telnet =====
  
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 The Synchronet Terminal Server will negotiate Telnet options with the client (enforcing echo and non-line-at-a-time modes), perform ''IAC'' (character 255) escaping, and CR/LF->CR and CR/NUL->CR translation (when not in //binary mode//). The Synchronet Terminal Server will negotiate Telnet options with the client (enforcing echo and non-line-at-a-time modes), perform ''IAC'' (character 255) escaping, and CR/LF->CR and CR/NUL->CR translation (when not in //binary mode//).
 +
 +==== Configure ====
 +Telnet support in the Synchronet Terminal Server can be configured via [[util:SCFG]]:Servers->Terminal Server->Telnet Support:
 +
 +<file>
 +╔══════════════════════════════════╗
 +║          Telnet Support          ║
 +╠══════════════════════════════════╣
 +║ │Enabled             Yes         ║
 +║ │Interfaces          0.0.0.0, :: ║
 +║ │Port                23          ║
 +║ │Command Debug       No          ║
 +║ │Send Go-Aheads      Yes         ║
 +╚══════════════════════════════════╝
 +</file>
 +
 +==== Options ====
 +
 +Telnet options are negotiated between the client and server, normally without any indication to the user.
 +
 +If no Telnet options are received by the Terminal Server during an initial client session on the configured Telnet port, the Terminal Server will revert the client to just "Raw TCP" protocol.
 +
 +Telnet options can be re-negotiated at any time during a Telnet session, but most options are only negotiated during the initial connection.
 +
 +^ Options       ^ Request ^ Description ^
 +| ECHO          | WILL    | Server will provide the echo of input keys, so request the the terminal does not echo (RFC-[[rfc>857]])|
 +| SUP_GA        | WILL    | Server does not send or expect to receive any Telnet Go-Ahead (GA) commands (RFC-[[rfc>858]]) |
 +| TERM_TYPE     | DO      | Server would like the client to provide the terminal-type, if available (RFC-[[rfc>930]]) |
 +| TERM_SPEED    | DO      | Server would like the client to provide the terminal-speed, if available (RFC-[[rfc>1079]]) |
 +| SEND_LOCATION | DO      | Server would like the client to provide the user's location, if available (RFC-[[rfc>779]]) |
 +| NEGOTIATE_WINDOW_SIZE | DO | Server would like the client to provide the terminal dimensions (cols x rows), if available (RFC-[[rfc>1073]]) |
 +| NEW_ENVIRON   | DO      | Server would like the client to provide environment variables (RFC-[[rfc>1572]]) - unused |
 +
 +The BINARY_TX option (disabling special treatment of CR/LF and CR/NUL) is dynamically negotiated as needed, for file transfers.
 +
 +=== Debugging ===
 +
 +The Terminal server logs all Telnet option negotiations using a //Debugging// log-level:
 +
 +<file>
 +  6/20  05:56:41p  Node 1 sending telnet cmd: WILL Echo
 +  6/20  05:56:41p  Node 1 sending telnet cmd: WILL Suppress Go Ahead
 +  6/20  05:56:41p  Node 1 sending telnet cmd: DO Terminal Type
 +  6/20  05:56:41p  Node 1 sending telnet cmd: DO Terminal Speed
 +  6/20  05:56:41p  Node 1 sending telnet cmd: DO Send Location
 +  6/20  05:56:41p  Node 1 sending telnet cmd: DO Negotiate About Window Size
 +  6/20  05:56:41p  Node 1 sending telnet cmd: DO New Environment Option
 +  6/20  05:56:41p  Node 1 received telnet cmd: DO Echo
 +  6/20  05:56:41p  Node 1 received telnet cmd: DO Suppress Go Ahead
 +  6/20  05:56:41p  Node 1 received telnet cmd: WILL Terminal Type
 +  6/20  05:56:41p  Node 1 requesting telnet terminal type
 +  6/20  05:56:41p  Node 1 received telnet cmd: WON'T Terminal Speed
 +  6/20  05:56:41p  Node 1 sending telnet cmd: DON'T Terminal Speed
 +  6/20  05:56:41p  Node 1 received telnet cmd: WON'T Send Location
 +  6/20  05:56:41p  Node 1 sending telnet cmd: DON'T Send Location
 +  6/20  05:56:41p  Node 1 received telnet cmd: WILL Negotiate About Window Size
 +  6/20  05:56:41p  Node 1 received telnet sub-negotiation command: Negotiate About Window Size
 +  6/20  05:56:41p  Node 1 received telnet window size: 80x24
 +  6/20  05:56:41p  Node 1 received telnet cmd: WON'T New Environment Option
 +  6/20  05:56:41p  Node 1 received telnet sub-negotiation command: Terminal Type
 +  6/20  05:56:41p  Node 1 received telnet terminal type: ANSI
 +</file>
 +
 +
 +===== SSH =====
 +[[wp>Secure Shell]] version 2 clients are supported, by default, on the standard SSH TCP port: 22.
 +
 +SSHv2 support provided by [[dev:dependencies#cryptlib]].
 +
 +==== Configure ====
 +
 +SSH support in the Synchronet Terminal Server can be configured via [[util:SCFG]]:Servers->Terminal Server->SSH Support:
 +<file>
 +╔══════════════════════════════════════════════════════╗
 +║                      SSH Support                     ║
 +╠══════════════════════════════════════════════════════╣
 +║ │Enabled                       Yes                   ║
 +║ │Interfaces                    0.0.0.0, ::           ║
 +║ │Port                          22                    ║
 +║ │Connect Timeout               10 seconds            ║
 +║ │Error Level                   Warning               ║
 +║ │User Authentication Type      Valid Key or Username ║
 +║ │File Transfer (SFTP) Support  No                    ║
 +║ │Max SFTP Inactivity           N/A                   ║
 +╚══════════════════════════════════════════════════════╝
 +</file>
 +
 +==== cryptlib.key ====
 +
 +The SSH private key is stored in the file ''[[dir:ctrl]]/cryptlib.key'' and is encrypted with the configured System Password (from [[util:SCFG]]->System). If the System Password is changed **after** the ''cryptlib.key'' file has been generated (and encrypted), you will need to delete the key file and recycle the terminal server for the key file to be regenerated and re-encrypted with the new System Password.
 +
 +The following Terminal Server log message indicates a problem decrypting the ''cryptlib.key'' file:
 +  'Couldn't import the session key used to protect the private key' (-22) getting private key
 ===== RLogin ===== ===== RLogin =====
-[[ftp://ftp.rfc-editor.org/in-notes/rfc1282.txt|RLogin]] clients are supported, by default, on the standard RLogin TCP port: 513.+BSD Rlogin (RFC-[[rfc>1282]]) clients are supported, by default, on the standard RLogin TCP port: 513. 
 + 
 +==== Configure ==== 
 +RLogin support in the Synchronet Terminal Server can be configured via [[util:SCFG]]:Servers->Terminal Server->RLogin Support: 
 + 
 +<file> 
 +╔══════════════════════════════════╗ 
 +║          RLogin Support          ║ 
 +╠══════════════════════════════════╣ 
 +║ │Enabled             Yes         ║ 
 +║ │Interfaces          0.0.0.0, :: ║ 
 +║ │Port                513         ║ 
 +╚══════════════════════════════════╝ 
 +</file> 
 + 
 +==== History  ====
  
-==== History of Synchronet's support for BSD RLogin ====+Synchronet's RLogin support has gone through some significant changes since its introduction in 2000.
  
 === SBBS v3.00c 2000 === === SBBS v3.00c 2000 ===
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   * [[person:digital man]] removed and deprecated the ''USE_2ND_RLOGIN'' option (and related [[monitor:sbbscon|sbbs]] command-line option and [[monitor:sbbsctrl]] checkbox) as this is now the **only** behavior supported by the Synchronet [[server:Terminal]] Server: the first string received from the RLogin client (''client-user-name'') **may** be a password, the second string received (''server-user-name'') **must** be a valid user ID (alias).   * [[person:digital man]] removed and deprecated the ''USE_2ND_RLOGIN'' option (and related [[monitor:sbbscon|sbbs]] command-line option and [[monitor:sbbsctrl]] checkbox) as this is now the **only** behavior supported by the Synchronet [[server:Terminal]] Server: the first string received from the RLogin client (''client-user-name'') **may** be a password, the second string received (''server-user-name'') **must** be a valid user ID (alias).
-  * [[person:digital man]] changed the ''bbs.rlogin_gate'' function to accept 3 optional arguments: ''client-user-name'', ''server-user-name'', and ''terminal'', in the order specified by the RFC 1282. +  * [[person:digital man]] changed the ''bbs.rlogin_gate'' function to accept 3 optional arguments: ''client-user-name'', ''server-user-name'', and ''terminal'', in the order specified by the RFC-[[rfc>1282]].
-===== SSH ===== +
-[[wp>Secure Shell]] version 2 clients are supported, by default, on the standard SSH TCP port: 22. +
- +
-SSHv2 support provided by [[dev:dependencies#cryptlib]].+
  
 ===== JavaScript ===== ===== JavaScript =====
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   * [[http://synchro.net/docs/jsobjs.html#console|console object]]   * [[http://synchro.net/docs/jsobjs.html#console|console object]]
  
-===== Source Code ===== 
- 
-The Synchronet Terminal Server source code makes up the majority of the C (and all of the C++) files found in ''[[dev:cvs]][[http://cvs.synchro.net/cgi-bin/viewcvs.cgi/src/sbbs3/|/src/sbbs3]]'' with the main module being ''[[http://cvs.synchro.net/cgi-bin/viewcvs.cgi/*checkout*/src/sbbs3/main.cpp|main.cpp]]''. 
  
 ====== See Also ====== ====== See Also ======

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