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                             PC Micro Presents:
                         -= Net2BBS Telnet Server =-
                                  for Windows
                                 Version  1.16
                                  May 1, 2017
____________________________________________________________________________

 Net2BBS is a small yet powerful console Windows Telnet Server which
 is bundled as part of the freeware NetFoss FOSSIL driver package.
 Http://pcmicro.com/netfoss


 Net2BBS has the following features:

   * Very small footprint, NET2BBS.EXE is only a few Kbytes in size.
   * Very fast, Net2BBS is written entirly in MASM32 SDK Assembler.
   * Configurable Node support, up to 256 nodes.
   * Logs IP's and HostNames of connections to screen and file.
   * Allows defining an IP/hostname block list, supporting wildcards.
   * Detects portscanners, preventing them from accessing the BBS.
   * Detects IP hammering, and temporarily blocks offending IP's.
   * Allows blocking IP addresses listed on multiple DNS Blacklists.
   * Allows blocking IP addresses by Country.
   * Prevents denied IP's from reconnecting using a firewall technique.
   * Multimedia support: plays login.wav and logoff.wav if found.
   * Semaphore support: Prevents BBS access while a semaphore file exists.
   * Pseudo Nodes allow multiple BBS software to share the NetFoss nodes.
   * Supports all NT versions of Windows including 10 and Server Core.
   * Runs as a Console Application or as a Service.
   * Allows sysop to view BBS nodes, even when running as a service.
   * A classic Console mode text interface.
   * Includes a simple Socket Policy Server, compatible with Flash
   * Open Source (MASM32).


____________________________________________________________________________

 Portscanner detection and Accept refusal

 Net2BBS uses an advanced accept refusal technique to minimize traffic from
 undesirable clients, such as portscanners and botnets.

 Once a portscanner has been detected, or a client fails the DNSBL tests or
 is already listed in the killlist blockfile, their IP address is added to a
 temporary cache of IP's to firewall. If these IP's attempt to reconnect,
 Net2BBS will refuse to respond at all until they are no longer in the cache.
 However, the failed attempts are still written to the log.
 
 The cache is circular, so once it fills up the new IP's added to it will
 overwrite the oldest ones. By default, IP addresses added to the cache will
 be automaticly removed after 2 hours but this can be adjusted by setting
 the CacheTime= setting in the Net2BBS.ini. I.E.: CacheTime=60 for 1 hour
 or CacheTime=0 to never remove it.

____________________________________________________________________________

 Editing the NET2BBS.INI Configuration file
 ------------------------------------------

 Net2BBS needs to be configured before it will function. This is done by
 creating or editing a configuration file. You can specify the name of the
 configuration .INI file to load when Net2BBS is run from a Command Line.
 If no filename is specified, NET2BBS.INI will be selected by default.

 If Net2BBS is configured as a service, it will automatically try to open
 NET2BBS.INI. When running as a service, no other filename can be selected.

 A NET2BBS.SAMPLE.INI is included in the distribution archive, which you
 can rename or copy to NET2BBS.INI before you edit it.

 When you run Net2BBS, you can press [C] to Configure the NET2BBS.INI.
 Or you can manually edit the Net2BBS.INI file with a text editor, such
 as NotePad. The NET2BBS.INI must be located in the same directory where
 NET2BBS.EXE is located. Changes to NET2BBS.INI will not take effect
 until the next time Net2BBS is started.

 The Sample .INI file uses settings like these:

Command=c:\netfoss\nf.bat /n*N /h*H c:\pcb\pcboard.bat *N
StartPath=c:\pcb\node*N
Port=23
PolicyPort=843
Nodes=256
StartNode=1
MaxSameIP=3
Debug=1
NodeView=1
MainView=1
NodeLines=25
Log=telnet.log
KillList=kill.txt
KillMsg=You are not welcome here.
KillMsgFile=goaway.ans
Editor=notepad.exe
Semaphore=wait.sem
Resolve=1
ResolveMsg=o Net2BBS - Resolving your IP Address...
ShowHost=1
Blocking=0
AntiScanner=1
AntiHammer=0
CacheTime=0
WhiteList=127.0.0.1
DNSBL=zz.countries.nerd.dk
BlockCC=156,643,392,804    ; 156=China 643=Russia 392=Japan 804=Ukraine 
DNSBL2=xbl.spamhaus.org
;DNSBL3=dnsbl.proxybl.org
;DNSBL4=bl.blocklist.de


 Here is what each line does:

 [Settings]    This line must appear above all other valid lines.
               Any lines above this line will be treated as comments.
               This line is required, as it defines a Settings group.

 Command=      The Command Line Net2BBS spawns each time a node is
               opened for an incoming telnet connection.
               ======================================================
               Normally this will execute NF.BAT and a second batch
               file for the BBS software. Both the Node number and
               the TCP Socket Handle need to be passed on the command
               line that spawns the application, allowing it to take
               control of the incoming TCP connection.
               The following Macros are supported:
               *N = The Node number Net2BBS assigned to this session
               *Z = The Pseudo Node number to be passed to the BBS  
               *H = The telnet Socket Handle
               *I = The users IP Address
               *R = The users Resolved Hostname

 StartPath=    This is the directory that Net2BBS will change to
               to before spawning the Command Line. You can use the
               *N (Node Macro) in the Startpath which will be replaced
               with the node number.

 Port=         The TCP/IP port that Net2BBS will monitor for incoming
               telnet connections. By default this will be port 23,
               the Telnet port. Some ISP's block port 23 from incoming
               connections, in which case you may need to define a
               non-standard port.

 PolicyPort=   The TCP/IP port that Net2BBS will monitor for incoming
               Socket Policy connections. By default this is disabled,
               but if a non-zero port value (usually 843) is specified
               then the Socket Policy Server will be enabled on that
               port. Connections on this port will be sent the file
               "SocketPolicy.xml" located in the Net2BBS directory.

 Nodes=        The maximum number of simultaneous telnet connections
               allowed to be active. By default this will be 256 which
               is the maximum value that Net2BBS currently supports.
               You can define any value from 1 to 256.

 StartNode=    The Starting Node number created by Net2BBS. This could
               be handy if you use specific nodes for Telnet, and other
               nodes for dialup. For example you could define Nodes=50
               and StartNode=101, to have Net2BBS only assign nodes 101
               thru 150.

               When using StartNode, it is possible to tell the BBS
               software to use a pseudo node value (macro *Z), so that
               the BBS nodes start at Node 1. This is useful when 
               running multiple BBSes on the same PC. See the Pseudo
               Node section below for details.

 MaxSameIP=    Maximum number of simultaneous connections allowed from
               the same IP address. The default is 3. Once this limit
               is reached, new connections will be refused and added to
               the temporary accept-refusal cache. 

 Debug=        A logical flag (either 0 or 1), to disable or enable
               debug mode. When debug mode is 1 (enabled), some extra
               information is displayed on the screen.

 NodeView=     A value which defines the console Window view setting
               for new connections when a node is started.
               Valid options for NodeView are:

               =0 - Hide:            Window not is Visable or viewable.
               =1 - Normal:          Window not active but visable.
               =2 - ShowMinimized:   Window active but minimized
               =3 - Maximize:        Window maximized but not active. 
               =4 - ShowNoActivate:  Window visable but not active.
               =5 - Show:            Window active and visable
                                      using current size and position.
               =6 - Mininize:        Window minimized and not active.
               =7 - ShowMinNoActive: Window minimized, visable but not
                                     activated.
               =8 - ShowNA           Window visable but not active,
                                      using current size and position.
               =9 - Restore          Window active and visable. If the
                                     window was minimized or maximized,
                                     it is restored to its original size

 MainView=     A value which defines the console window view setting for
               Net2BBS.exe. Uses the same values as Nodeview above.

 NodeLines=    *** Warning: This option is somewhat experimental!
               A value defining the number of lines the node's Console
               window will be set for when it's created. (25 or 50).
               Due to limitations in the WinAPI, this will only work
               correctly when the console window is using a default
               font size of 8x13 (8 pixels wide by 13 pixels high).
               If yours uses a non default font size this may result
               in a horizontal scroll-bar being added to the Window.

 Log=          The Log file name (the path is optional). If you do not
               want a log file, set this to Log=null

 Semaphore=    The Semaphore filename (the path is optional).
               Before Net2BBS assigns an incoming telnet connection
               to a node, it checks to make sure that the Semaphore
               file does not exist. If the file does exist, the
               connection is refused due to a semaphore event. If the
               Semaphore file contains any text, this text will be
               sent to the caller before they are disconnected.

 CacheTime=    Sets a timeout in minutes to remove cached IP's from the
               accept-refusal cache. The default is 120 (2 hours). If
               it is set to 0 they will never be removed until the
               cache fills up and is overwritten by new IP's being added.

 KillList=     The Blocked IP Address/Hostname list filename.
               This file should contain one IP Address or Hostname
               to block per line, and wildcard characters ? and *
               are fully supported. In order for Hostname blocking
               to be effective, the Resolve Mode must be enabled.
               Example wildcard hostname: *.sdf.org
               Example wildcard IP address: 206.188.*
               
 KillMsg=      A line of text to display to the caller when their
               IP Address or hostname made a wildcard match with
               one of the lines within the Kill List file.

 KillMsgFile=  A text file to display to the caller instead of any
               defined KillMsg line, if the KillMsgFile exists.

 Editor=       The name of the Text editor that will be used to
               edit the configuration and killlist files.
               It is also used to display the help file.

 Resolve=      A logical flag (0 or 1). When enabled (1), Net2BBS
               will attempt to resolve the callers IP Address to a
               hostname or domain name. Enabling Resolve mode can
               cause users to experience a short delay once they
               connect, while their IP is resolved. During this time
               they are shown the ResolveMsg text defined below,
               and once the resolve is completed, the caller is
               shown the results.

 ResolveMsg=   A line of text to display to the caller while their
               IP address is being resolved. ANSi characters can be
               used, as long as the first character after = is not
               an ESC, and no more then 128 characters are used.

 ShowHost=     A logical flag (0 or 1). When enabled (non-zero),
               (and Resolve= is also enabled) then Net2BBS will show
               the resolved hostname on the callers terminal, right
               after the ResolveMsg= text. Furthermore, after showing
               it, Net2BBS will pause for the number of milliseconds
               defined by this non-zero value. e.g. ShowHost=1000
               will cause a 1 second delay.

 Blocking =    A logical flag (0 or 1), when enabled, Net2BBS will
               set the Sockets to Blocking mode. The default setting
               is 0, which will set the Sockets to Non-Blocking mode.

 AntiScanner=  A logical flag (0 or 1), when enabled, Net2BBS will
               check to see if incoming connections are Port Scanner
               bots and if they appear to be, they are added to the
               accept-refusal cache.

 AntiHammer=   A logical flag (0 or 1), when enabled, NetBBS will
               count the number of Connects/Disconnects from the
               same IP address per minute. When it detects an
               excessive amount, it adds the IP to the accept-
               refusal cache.

 DNSBL=        The domain name of a DNS BlackList to use.
               If this option is defined, Net2BBS will make sure
               that any incoming connection's IP address is not
               listed in the defined DNS BlackList. If it is, the
               connection is immediately closed.
               Up to 4 DNS Blacklists can be defined: DNSBL, DNSBL2,
               DNSBL3, and DNSBL4.  (Note: DNSBL1 is invalid). 

 BlockCC=      ISO-3166 Country Codes to block when using the special
               Geo locater DNS blacklist: zz.countries.nerd.dk
               multiple codes can be entered, comma delmited.
|              See http://en.wikipedia.org/wiki/ISO_3166-1_numeric

 WhiteList=    List of up to 4 IP Addresses which will always be
               accepted, bypassing the AntiHammer, AntiPortScanner,
               and Maximum Same-IP connections checkers. They are
               comma delimited. Hostnames and wildcards are not allowed.



 Typically you will need to change the "Command=" and "StartPath="
 lines to run your BBS, MUD, etc., with any needed parameters. Refer
 to the example BBS configurations listed in NETFOSS.TXT for examples
 of how these "Command=" line should appear for your software.


____________________________________________________________________________

 Pseudo Nodes
 ------------

 Pseudo Nodes are useful When running multiple BBSes on the same PC.
 For example, if VA BBS is running on NetFoss nodes 1-100 on port 23,
 and PCBoard are running on nodes 101-200 on port 24, then PCBoard's
 "Who's online" list, would look strange since it would start at node
 101 instead of node 1. So by passing the PCBoard BBS software a
 Pseudo node value instead of the actual NetFoss node value, PCBoard
 will show Node 101 as being Node 1, Node 102 as being Node 2, etc.

 Here is now Net2BBS computes the Pseudo Node number to pass:
 *Z = (*N-StartNode)+1

 So for example if StartNode=101, The NetFoss node (*N)=105, then the
 Pseudo Node (*Z)=5.  In this example the BBS would think there is a
 user connected to Node 5, but in reality they are connected to
 NetFoss on Node 105. 

 Here is now the first 2 lines of Net2BBS.INI would usually look for a
 (non-Pseudo) PCBoard BBS configuration:

     Command=c:\netfoss\nf.bat /n*N /h*H c:\pcb\pcboard.bat *N
     StartPath=c:\pcb\node*N

 On this Command line, the node number (*N) is being passed both to
 NetFoss (nf.bat /n*N) and to the BBS software (pcboard.bat *N).
 On the StartPath line, the node number is passed as part of the path.

 In order to use a Pseudo Node, you still must passs *N to nf.bat, but
 you should pass *Z to the BBS batch file instead, and also pass *Z to
 Startpath if needed, like so:

     Command=c:\netfoss\nf.bat /n*N /h*H c:\pcb\pcboard.bat *Z
     StartPath=c:\pcb\node*Z

 In addition, in order to use NFU to run Win32 doors from a DOS BBS when
 using Pseudo-Nodes, your Telnet Server must be set an additional
 Environment Variable %NFNODE% to pass the NetFoss physical node (*N) to
 The environment. Because otherwise NFU will only know the Psudo-node
 (by reading DOOR.SYS). 

____________________________________________________________________________

 Using Net2BBS
 -------------

 Net2BBS can either be run a desktop Console mode application, or it
 can be installed as a Windows Service.
 
 Net2BBS supports the following keyboard commands:
 [ESC] Exit, [C] Configure INI, [E] Edit Blocked IP List, [F1] Help

 Pressing [ESC] once will confirm if you wish to exit or not.
 Pressing [ESC] twice will exit Net2BBS, and will shut down any
 active telnet connections.
 
 Pressing [ESC] followed by [R] will restart Net2BBS, and reload the
 NET2BBS.INI configuration file.

 Pressing [C] will edit the NET2BBS.INI configuration file.
 Changes that are saved will not be used until Net2BBS is restarted.

 Pressing [E] will edit the KillList, which is a list of blocked IP
 and/or HostNames to refuse access to. When editing the KillList file
 the changes will become active as soon as the file is saved.

 Pressing [F1] will view(edit) this help file.

 To hear a sound effect each time a user logs in or logs off, add
 the filenames login.wav and logoff.wav to the folder that Net2BBS
 is located in. Example sounds are available from netfoss.com.
 
____________________________________________________________________________

 Using Net2Mon
 -------------

 NetMon is a desktop monitor application, useful when Net2BBS is
 running as a Windows service in the background.

 NetMon appears nearly identical to the Net2BBS Console interface, and
 supports the identical keyboard commands.

 Net2Mon will automatically open NetSpy.exe on the desktop each time an
 incoming BBS session is opened by the Net2BBS telnet server. NetSpy is
 a DOS terminal redirector for Windows, which allows the sysop to spy on
 their users when Net2BBS is running as a service under later versions
 of Windows (such as Windows 8, 7, Vista, or Server 2008).

____________________________________________________________________________

 Customizing the Net2BBS Console interface
 -----------------------------------------

 You can adjust the default visibility and the the Height/Width layout
 of the Net2BBS Console window using any of the following methods:

   * Define the MainView= value in the configuration file (Net2BBS.INI)

   * Ajust the properties settings of the Net2BBS.exe (or Net2Mon.exe)
     by clicking the programs icon or shortcut and choose
     Properties > Layout to select a new Height or Width.
     You can further customize the look under the Font and Color tabs.

   * You can run the .exe file from a batch file which first uses the
     mode command to set a new Height (defined in lines). e.g.:
     mode con lines=25

   * Further customization can be done by installing a freeware utility
     called TrayIt (Available from the Net2BBS web site).

____________________________________________________________________________

 Running Net2BBS as a Service
 ----------------------------

 As of version 1.05, Net2BBS can run either as an application, or as a
 Windows service without needing a third party service manager.

 To install Net2BSS.EXE as a Windows Service, Open a Command Prompt
 (If Running under Windows Vista or later, it must be opened with
 Administrator rights by right-clicking on the Command Prompt Icon
 and selecting "Run as Administrator".)
 From this Command Prompt, type the following command line:
 NET2MON /instserv
 ____________________

 The service can be stopped or started using one of these command lines:
 net stop net2bbs
 net start net2bbs

 To delete the delete the Net2BBS service, type this command line:
 NET2MON /deleteserv

 In Windows XP and 2000, Services can be configured to directly interact
 with the Windows desktop. This can be enabled by going into the Control
 Panel's "services" applet (Found under Administrative Tools), open the
 Net2BBS service  properties, and click on the "Logon" tab, and select
 the following:

    (x) Local System Account
        [x] Allow Service to interact with Desktop
 
 Once these options are enabled, Stop and Restart the service for the
 changes to take effect.

 This will allow the desktop user to view not only the Main Net2BBS
 Console (while it's running as a service), but also allows viewing any
 Active BBS Node Consoles, allowing the desktop user to interact with the
 connected telnet clients.

 In later versions of Windows (including Vista, 7, and 8) Microsoft has
 added security changes which prevent services from interacting directly
 with the Windows desktop. However, it is still possible to view it one
 of two ways:

  1. If you install Net2BBS as a service, you can run Net2Mon on your
     Desktop, which will display all the same data which Net2BBS displays.
     Net2Mon will also open a copy of NetSpy for each BBS node that is
     opened, to allow the sysop to view activity on each node.
     This is the recommended method.

  2. If you install Net2BBS as a service, you can switch from the Windows
     Desktop to "Sesssion 0" which is where "Local System Account" services
     which are configured to "interact with Desktop" are visable. This
     allows the active nodes to be visable without needing NetMon/NetSpy.

 To allow switching from the Windows desktop to "Session 0" under Windows
 Vista, 7 or 8, enable the "Interactive Services Detection" service.
 Then each time the Net2BBS Service opens a telnet BBS Node session, the
 "Interactive Services detection" will flash in the task bar, and displays
 the following message:
    "A program running on this computer is trying to display a message."
 Next to this message a button says "View the message". When this button
 is clicked Windows will switch from Desktop to "Session 0" where the
 Console Window of every active BBS node will be visable.
  
 To manually switch from the Desktop to "Session 0", you can use the
 hidden keyboard command "0" from Net2Mon.exe. This will only work if the
 "Interactive Services Detecton" Service is running,

 When Net2BBS.exe is running as a service, all screen output and sound
 effects are forwarded to Net2Mon.exe (if it is running) Net2Mon is the
 Net2BBS Monitor application. This allows you to view and control the
 Net2BBS service from the desktop, even in later versions of Windows.


____________________________________________________________________________

 Using Net2BBS over a Web Server
 -------------------------------

 There are several third party utilities which allow ANSI compatible
 telnet servers to be accessed over a web server, by installing a web
 based telnet client (terminal) in an HTML page. Here are a few:

 JTA - Java Telnet Applet by Matthias Jugel and Marcus Mei▀ner
 http://javassh.org/

 AnyTerm - Java Telnet terminal by Phil Endecott
 http://anyterm.org

 FlashTerm - Telnet terminal for the Adobe Flash Player by Peter Nitsch
 http://flashterm.org 

 jsTerm - HTML5 Telnet terminal using Websocket API by Peter Nitsch
 http://jsterm.com/ 

 fTelnet - Telnet terminal for the Adobe Flash Player by Rick Parrish
 http://ftelnet.ca

 HTMLTerm - HTML5 terminal & WebSocket to Telnet redirector by Rick Parrish
 http://ftelnet.ca


 In order to allow Flash telnet terminals to connect to your Telnet
 Server, you must also run a Socket Policy Server on the same machine,
 either on the same TCP port as the telnet server, or on TCP port 843.
 Flash first looks for a Socket Policy server on port 843, and if non
 is found within 3 seconds, it will look for one on the telnet port. 

 Net2BBS has a built-in Socket Policy Server which is disabled by
 default. To enable it, add the following line to your NET2BBS.INI:
 PolicyPort=843
 When this is enabled, Net2BBS will send the filename SocketPolicy.xml
 when a connection is made to the defined TCP port.

 In order to allow HTMLTerm to function, you must also run the WBA.exe
 (Web BBS Assistant) which is included in the fTelnet/HTMLTerm package.

____________________________________________________________________________

 DNS Blacklists
 --------------

 While DNS Blacklists are primarily used for mail servers to block
 known spammers from delivering email, in recent years they are also
 being used by IRC Networks to block open proxies and hijacked PC's
 infected by illegal 3rd party exploits.
 Care should be taken to use a DNS Blacklist which only blocks
 Exploits, Proxies, and Spammers.  There are some blacklists which
 are designed to block end-user IP address ranges because they should
 not be sending unauthenticated SMTP email on a non-corporate mail
 server. Using such a list would block thousands of legitimate end-
 users from your BBS. Do not use pbl.spamhaus.org for example, which
 is such a policy block list. Also do not use zen.spamhaus.org for
 the same reason (the zen list includes the pbl list).

 Net2BBS allows you to define up to 4 DNS Blacklists.  Each List that
 is used will increase the delay before an incoming telnet connection
 is passed to the BBS. This delay is typically slighty under one second
 for each DNSBL used.


 Here are some recommended lists to use:

 xbl.spamhaus.org
 ================
 Lists known IP addresses of hijacked PCs infected by illegal 3rd
 party exploits, including open proxies, worms/viruses with built-in
 spam engines, and other types of trojan-horse exploits.
 Some of their data comes from cbl.abuseat.org, so using both of these
 would be redundant.


 dnsbl.proxybl.org
 =================
 Lists verified open/anonymous proxies.
 Returns 127.0.0.2 for listed IP's, TXT will contain listing information. 

 sbl.nszones.com
 ===============
 Lists Open Relay and Hijacked PC's/ Spambots.

 Don't use: dnsbl.ahbl.org -  This list was recently deactivated.

 bl.blocklist.de
 ===============
 Lists IP's which attack all forms of Servers other then spamming.

 zz.countries.nerd.dk
 ====================
 Unlike typical DNSBL, this one is a country geo locater which simply
 returns the ISO 3166 numeric country code belonging to the IP, which
 Net2BBS then compares to it's own list of country codes to block.

 When using this DNSBL, you can define a list of countries to block by
 putting the numeric country codes on the BlockCC= line into Net2BBS.ini
 like so:

 BlockCC=156,643,392,804    ; 156=China 643=Russia 392=Japan 804=Ukraine

 For a full list of ISO-3166 Country Codes see:
 http://en.wikipedia.org/wiki/ISO_3166-1_numeric 


 There are many other DNS Blacklists available, and most are free for
 non-commercial use.  

____________________________________________________________________________

 LICENSE
 -------

 Use NEt2BBS entirely at your own risk. In no event will PC Micro,
 or its agents be liable for any damages, including loss of profits or
 other consequential damages arising from the use or inability to use
 Net2BBS.

 You may bundle NetFoss (including Net2BBS) with your own BBS software
 or telnet server only as outlined in the NetFoss License defined in
 included NETFOSS.TXT file included with NetFoss.

 You may modify the Net2BBS.ASM, Net2Mon.ASM, and NetSpy.ASM source code
 as you desire as long as they are not used for malware. If you make any
 bug-fixes or add new features, please consider sending us any changes
 you are willing to share, but know that you don't have to. 

 Net2BBS is true open-source code, which is not limited by any GNU GPL.
 You may use Net2BBS source code snippets for any Windows based project
 commercial or otherwise that does not conflict with the MASM32-Project
 license which Net2BBS was created under. http://masm32.com/license.htm

 Net2BBS is a trademark of PC Micro Systems, Inc.
 Net2Mon is a trademark of PC Micro Systems, Inc.
 NetSpy  is a trademark of PC Micro Systems, Inc.
 NetFoss is a trademark of PC Micro Systems, Inc.
 PC Micro is a trademark of PC Micro Systens, Inc.
 Windows is a trademark of Microsoft Corporation.
 Other products mentioned are properties of their respected authors.

____________________________________________________________________________

 End of Net2BBS.txt Help file.

 For more information about using Net2BBS with NetFoss, please view
 the included NetFoss.txt document, or visit the NetFoss web site at
 http://netfoss.com  or http://pcmicro.com/netfoss

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