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Man Pages

Manual Reference Pages  -  DCCSIGHT (8)


dccsight - Distributed Checksum Clearinghouse raw checksum interface


See Also


.Bk -words [-VdPQC] [-h homedir] [-m map] [-w whiteclnt] [-t targets] [-i infile] [-L ltype,facility.level]


Dccsight reads one or more lines containing DCC checksums, reports them to a DCC server, and writes a X-DCC header line. It can be used to report checksums obtained from dccproc(8) using -C .


The following options are available:
-V displays the version of the DCC raw checksum interface. Two or more -V options show the options with which it was built.
-d enables debugging output from the DCC client software. Additional -d options increase the number of messages.
-P The SpamAsassin plugin should watch for "bulk" in X-DCC SMTP header fields, but historically has looked for counts of "many". However, there are situations when dccsight knows that a mail message is extremely bulky and probably spam. For example, mail from a sender that is blacklisted in whiteclnt gets an X-DCC header that includes bulk. To acommodate that bug in SpamAssassin, by default whenever dccsight generates an X-DCC header containing "bulk", it also forces the Body count to "many". -P turns off that kludge and the Body contains the count from the DCC server.
-Q only queries the DCC server about the checksums of messages instead of reporting. This is useful when dccsight is used to filter mail that has already been reported to a DCC server by another DCC client. No single mail message should be reported to a DCC server more than once per recipient, because each report will increase the apparent "bulkness" of the message.

It is better to use MXDCC lines in the global /usr/local/dcc/whiteclnt file for your MX mail servers that use DCC than to use -Q with dccsight.

Do not use -Q except on mail that you know has been reported to a DCC server. DCC depends on reports of all except known private mail and works only because almost no DCC installations use -Q .

-C outputs the checksums for the message as well as the X-DCC header.
-h homedir
  overrides the default DCC home directory, /usr/local/dcc.
-m map specifies a name or path of the memory mapped parameter file instead of the default /usr/local/dcc/map in the DCC home directory. It should be created with the cdcc(8) command.
-w whiteclnt
  specifies an optional file containing SMTP client IP addresses and SMTP headers of mail that do not need X-DCC headers and whose checksums should not be reported to the DCC server. It can also contain checksums of spam. If the pathname is not absolute, it is relative to the DCC home directory. Thus, individual users with private whitelists usually specify them with absolute paths. It is useful to include a common or system-wide whitelist in private lists.

The format of the dccsight whiteclnt file is the same as the /usr/local/dcc/whitelist file required by dbclean(8) and dccsight(8). Because this list is used frequently, a companion file is used. It has the same pathname but with an added suffix of .dccw. After being created empty, it will contain an automatic memory mapped hash table of the main file.

-t targets
  specifies the number of addressees of the message if other than 1. The string many instead of a number asserts that there were too many addressees and that the message is unsolicited bulk email.
-i infile
  specifies an input file instead of standard input. If not absolute, the pathname is interpreted relative to the directory in which dccsight was started.
-L ltype,facility.level
  specifies how messages should be logged. Ltype must be error, info, or off to indicate which of the two types of messages are being controlled or to turn off all syslog(3) messages from dccsight. Level must be a syslog(3) level among EMERG, ALERT, CRIT, ERR, WARNING, NOTICE, INFO, and DEBUG. Facility must be among AUTH, AUTHPRIV, CRON, DAEMON, FTP, KERN, LPR, MAIL, NEWS, USER, UUCP, and LOCAL0 through LOCAL7. The default is equivalent to

    -L info,MAIL.NOTICE-L error,MAIL.ERR

dccsight exits 0 on success, and >0 if an error occurs.


  DCC home directory.
map memory mapped file in the DCC home directory of information concerning DCC servers.
  contains the client whitelist in the format described in dcc(8).
  memory mapped hash table of the /usr/local/dcc/whiteclnt file.


cdcc(8), dcc(8), dbclean(8), dccd(8), dblist(8), dccproc(8), dccm(8), dccifd(8), mail(1), procmail(1).


Implementation of dccsight was started at Rhyolite Software in 2000. This document describes version 1.3.158.
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