ratfs man page on Plan9

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RATFS(4)							      RATFS(4)

       ratfs  - mail address ratification file system

       ratfs [ -d ] [ -c configuration ] [ -f classification ] [ -m mountpoint

       Ratfs starts a process that mounts itself (see bind(2))	on  mountpoint
       (default	 /mail/ratify).	  Ratfs	 is a persistent representation of the
       local network configuration and spam blocking list.   Without  it  each
       instance	 of  smtpd(6)  would  need to reread and parse a multimegabyte
       list of addresses and accounts.

       Ratfs serves a control file, ctl, and several  top  level  directories:
       trusted, deny, dial, block, delay, and allow.

       The control file is write only and accepts three possible commands:

       reload rereads classification and configuration

       debug file
	      creates file and sends debugging output to it.

	      closes the debug file and turns off debugging

       The  directory  trusted	serves a file for each IP range from which all
       mail is trusted.	 The names of the files are CIDR blocks; an IP address
       or  an  IP  address  followed  by  #n, where n is the number of bits to
       match.  To check if any IP address falls in a trusted range, it is suf‐
       ficient to open the file whose name is the IP address.  For example, if
       trusted contains only the file, an attempt to  open  the
       file  will	succeed	 while opening will fail.  To
       determine the particular range matched, dirfstat	 (see  stat  (2))  the
       open file and the name field will be the matching CIDR range.

       The  trusted  ranges come both from the ournet entries in the file con‐
       figuration (default /mail/lib/blocked) and from creates, typically done
       by imap4d (see ipserv(8)) and pop3 (see mail(1)) whenever they are used
       to read someone's mail.

       The remaining directories, allow, block, delay, deny, and dial,	repre‐
       sent	the	contents     of	    the	    classification    (default
       /mail/lib/smtpd.conf.ext).   Each  contains  two	 directories;  ip  and
       account.	  The  ip directory has the same open semantics as the trusted
       directory, i.e., to check if an IP address falls in that category,  try
       to  open a file whose name is the IP address.  The account directory is
       similar but is used for matching strings.  Each file in	the  directory
       represents  a regular expression.  To see if one of the strings matches
       one of the regular expressions, try to open the file whose name is  the
       string.	 If  it	 succeeds,  then  there	 is  a regular expression that
       matches.	 To determine the regular expression,  fstat  the  open	 file.
       The name field will be the regular expression.

       There  is  a  direct  mapping  from entries in classification and files
       under allow, block, delay, deny, and dial.  A configuration file	 entry
       of the form:
       corresponds to the file dial/ip/	An entry of the form
	    *block    .*!gre
       corresponds to the file block/account/.*!gre.

       Both  the  configuration file and control file formats are described in


       mail(1) smtpd(6) scanmail(8)

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