Through fixes and improvements our ipfilter sources have diverged enough to warrant move from contrib into sbin/ipf. Now that I'm planning on implementing MSS clamping as in iptables it makes more sense to move ipfilter to sbin. This is the second of three commits of the ipfilter move. Suggested by glebius on two occaions. Suggested by and discussed with: glebius Reviewed by: glebius, kp (for #network) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D33510
53 lines
1.5 KiB
Groff
53 lines
1.5 KiB
Groff
.\" $FreeBSD$
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.\"
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.TH IPSCAN 5
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.SH NAME
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ipscan, ipscan.conf \- ipscan file format
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.SH DESCRIPTION
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.PP
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WARNING: This feature is to be considered experimental and may change
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significantly until a final implementation is drawn up.
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.PP
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The format for files accept by ipscan currently follow this rough grammar:
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.LP
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.nf
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line ::= name ":" matchup [ "," matchup ] "=" action .
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matchup ::= "(" ")" | "(" literal ")" | "(" literal "," match ")" .
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action ::= result | result "else" result .
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result ::= "close" | "track" | redirect .
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redirect ::= "redirect" ip-address [ "(" "," port-number ")" ] .
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match ::= { match-char }
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match-char ::= "*" | "?" | "."
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.fi
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.PP
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In this example an ip-address is a dotted-quad IPv4 address and a port-number
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is a number betwee 1 and 65535, inclusive. The match string is must be of
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same length as the literal string that it is matching (literal). The length
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of either string is limited to 16 bytes.
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.PP
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Currently, the redirect option is not yet been implemented.
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.LP
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.nf
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#
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# * = match any character, . = exact match, ? = case insensitive
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#
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# Scan for anything that looks like HTTP and redirect it to the local
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# proxy. One catch - this feature (redirect) is not yet implemented.
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#
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http : ("GET ", "???." ) = redirect(127.0.0.1)
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#
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# Track ssh connections (i.e do nothing)
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#
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ssh : (), ("SSH-") = track
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#
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# Things which look like smtp to be tracked else closed.
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# Client can start with EHLO (ESMTP) or HELO (SMTP).
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#
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smtp : ("HELO ", "**??."), ("220 ", "....") = track else close
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#
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.fi
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.SH FILES
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/etc/ipscan.conf
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.SH SEE ALSO
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ipscan(8)
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