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    The following form allows you to view linux man pages.

    Command:

    tcprules

    
    
    

    SYNOPSIS

           tcprules cdb tmp
    
    
    

    DESCRIPTION

           tcpserver(1)  optionally  follows rules to decide whether a TCP connec-
           tion is acceptable. For example, the rule
    
                  18.23.0.32:deny
    
           prohibits connections from IP address 18.23.0.32.
    
           tcprules reads rules from its standard input and writes them  into  cdb
           in a binary format suited for quick access by tcpserver(1).
    
           tcprules can be used while tcpserver(1) is running. It ensures that cdb
           is updated atomically. It does this by first writing the rules  to  tmp
           and  then  moving  tmp  on  top  of  cdb.  If tmp already exists, it is
           destroyed. The directories containing cdb and tmp must be  writable  to
           tcprules; they must also be on the same filesystem.
    
           If  there  is  a problem with the input or with tmp, tcprules complains
           and leaves cdb alone.
    
           The binary cdb format is portable across machines.
    
    
    

    RULE FORMAT

           A rule is one line. A file containing rules may also contain  comments:
           lines beginning with # are ignored.
    
           Each  rule  contains  an  address, a colon, and a list of instructions,
           with no extra spaces. When tcpserver(1) receives a connection from that
           address, it follows the instructions.
    
    
    

    ADDRESSES

           tcpserver(1) looks for rules with various addresses:
    
           1.     $TCPREMOTEINFO@$TCPREMOTEIP, if $TCPREMOTEINFO is set;
    
           2.     $TCPREMOTEINFO@=$TCPREMOTEHOST,  if  $TCPREMOTEINFO  is  set and
                  $TCPREMOTEHOST is set;
    
           3.     $TCPREMOTEIP;
    
           4.     =$TCPREMOTEHOST, if $TCPREMOTEHOST is set;
    
           5.     shorter and shorter prefixes of $TCPREMOTEIP ending with a dot;
    
           6.     shorter and shorter suffixes of $TCPREMOTEHOST starting  with  a
                  dot, preceded by =, if $TCPREMOTEHOST is set;
    
           7.     =, if $TCPREMOTEHOST is set; and finally
    
    
           If  $TCPREMOTEIP  is  18.23.0.32,  tcpserver(1)  will follow the second
           instructions.
    
           If $TCPREMOTEIP is 127.0.0.1 and $TCPREMOTEINFO is  bill,  tcpserver(1)
           will follow the fourth instructions.
    
           If  $TCPREMOTEIP  is  127.0.0.1 and $TCPREMOTEINFO is joe, tcpserver(1)
           will follow the first instructions.
    
           You can use tcprulescheck(1) to see how tcpserver will interpret  rules
           in cdb.
    
    
    

    ADDRESS RANGES

           tcprules  treats  1.2.3.37-53:ins  as  an  abbreviation  for  the rules
           1.2.3.37:ins, 1.2.3.38:ins, and so on up  through  1.2.3.53:ins.  Simi-
           larly, 10.2-3.:ins is an abbreviation for 10.2.:ins and 10.3.:ins.
    
    
    

    INSTRUCTIONS

           The  instructions  in a rule must begin with either allow or deny. deny
           tells tcpserver(1) to drop the connection without running anything. For
           example, the rule
    
                  :deny
    
           tells  tcpserver(1) to drop all connections that aren't handled by more
           specific rules.
    
           The instructions may continue with some environment variables,  in  the
           form  var="x".   tcpserver(1)  adds  an  environment variable $var with
           value x. For example,
    
                  10.0.:allow,RELAYCLIENT="@fix.me"
    
           adds an environment  variable  $RELAYCLIENT  with  value  @fix.me.  The
           quotes may be replaced by any repeated character:
    
                  10.0.:allow,RELAYCLIENT=/@fix.me/
    
           Any number of variables may be listed:
    
                  127.0.0.1:allow,RELAYCLIENT="",TCPLOCALHOST="movie.edu"
    
    
    

    SEE ALSO

           tcpserver(1),   tcprulescheck(1),  argv0(1),  fixcrio(1),  recordio(1),
           rblsmtpd(1), tcpclient(1),  who@(1),  date@(1),  finger@(1),  http@(1),
           tcpcat(1), mconnect(1), tcp-environ(5)
    
           http://cr.yp.to/ucspi-tcp.html
    
    
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