ref: 365e63b36a413703f5fcd0ed5ccbd79c3a53afbf
dir: /sys/man/4/ratfs/
.TH RATFS 4 .SH NAME ratfs \- mail address ratification file system .SH SYNOPSIS .B ratfs [ .B -d ] [ .B -c .I configuration ] [ .B -f .I classification ] [ .B -m .I mountpoint ] .SH DESCRIPTION .I Ratfs starts a process that mounts itself (see .IR bind (2)) on .I mountpoint (default .BR /mail/ratify ). .I Ratfs is a persistent representation of the local network configuration and spam blocking list. Without it each instance of .IR smtpd (6) would need to reread and parse a multimegabyte list of addresses and accounts. .PP .I Ratfs serves a control file, .BR ctl , and several top level directories: .BR trusted , .BR deny , .BR dial , .BR block , .BR delay , and .BR allow . .PP The control file is write only and accepts three possible commands: .TF "debug file .TP .B reload rereads .I classification and .I configuration .TP .B debug \fIfile\fP creates .I file and sends debugging output to it. .TP .B nodebug closes the debug file and turns off debugging .PD .PP The directory .B 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 .BR #\fIn\fP , where .I n is the number of bits to match. To check if any IP address falls in a trusted range, it is sufficient to open the file whose name is the IP address. For example, if .B trusted contains only the file .BR 135.104.0.0#16 , an attempt to open the file 135.104.9.1 will succeed while opening 10.1.1.1 will fail. To determine the particular range matched, .B dirfstat (see stat (2)) the open file and the .B name field will be the matching CIDR range. .PP The trusted ranges come both from the .B ournet entries in the file .I configuration (default .BR /mail/lib/blocked ) and from creates, typically done by .B imap4d (see .IR ipserv (8)) and .B pop3 (see .IR mail (1)) whenever they are used to read someone's mail. .PP The remaining directories, .BR allow , .BR block , .BR delay , .BR deny , and .BR dial , represent the contents of the .I classification (default .BR /mail/lib/smtpd.conf.ext ). Each contains two directories; .B ip and .BR account . The .B ip directory has the same open semantics as the .B 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 .B 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, .B fstat the open file. The .B name field will be the regular expression. .PP There is a direct mapping from entries in .I classification and files under .BR allow , .BR block , .BR delay , .BR deny , and .BR dial. A configuration file entry of the form: .EX dial 135.104.9.0/24 .EE corresponds to the file .BR dial/ip/135.104.9.0#24 . An entry of the form .EX *block .*!gre .EE corresponds to the file .BR block/account/.*!gre . .PP Both the configuration file and control file formats are described in .IR smtpd (6). .SH SOURCE .B /sys/src/cmd/ratfs .SH "SEE ALSO" .IR mail (1) .IR smtpd (6) .IR scanmail (8)