tcpdmatch(8)
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TCPDMATCH(8) TCPDMATCH(8)
NAME
tcpdmatch - tcp wrapper oracle
SYNOPSIS
tcpdmatch [-d] [-i inet_conf] daemon client
tcpdmatch [-d] [-i inet_conf] daemon[@server]
[user@]client
DESCRIPTION
tcpdmatch predicts how the tcp wrapper would handle a spe-
cific request for service. Examples are given below.
The program examines the tcpd access control tables
(default /etc/hosts.allow and /etc/hosts.deny) and prints
its conclusion. For maximal accuracy, it extracts addi-
tional information from your inetd or tlid network config-
uration file.
When tcpdmatch finds a match in the access control tables,
it identifies the matched rule. In addition, it displays
the optional shell commands or options in a pretty-printed
format; this makes it easier for you to spot any discrep-
ancies between what you want and what the program under-
stands.
ARGUMENTS
The following two arguments are always required:
daemon A daemon process name. Typically, the last compo-
nent of a daemon executable pathname.
client A host name or network address, or one of the
`unknown' or `paranoid' wildcard patterns.
When a client host name is specified, tcpdmatch
gives a prediction for each address listed for that
client.
When a client address is specified, tcpdmatch pre-
dicts what tcpd would do when client name lookup
fails.
Optional information specified with the daemon@server
form:
server A host name or network address, or one of the
`unknown' or `paranoid' wildcard patterns. The
default server name is `unknown'.
Optional information specified with the user@client form:
user A client user identifier. Typically, a login name
or a numeric userid. The default user name is
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`unknown'.
OPTIONS
-d Examine hosts.allow and hosts.deny files in the
current directory instead of the default ones.
-i inet_conf
Specify this option when tcpdmatch is unable to
find your inetd.conf or tlid.conf network configu-
ration file, or when you suspect that the program
uses the wrong one.
EXAMPLES
To predict how tcpd would handle a telnet request from the
local system:
tcpdmatch in.telnetd localhost
The same request, pretending that hostname lookup failed:
tcpdmatch in.telnetd 127.0.0.1
To predict what tcpd would do when the client name does
not match the client address:
tcpdmatch in.telnetd paranoid
On some systems, daemon names have no `in.' prefix, or
tcpdmatch may need some help to locate the inetd configu-
ration file.
FILES
The default locations of the tcpd access control tables
are:
/etc/hosts.allow
/etc/hosts.deny
SEE ALSO
tcpdchk(8), tcpd configuration checker
hosts_access(5), format of the tcpd access control tables.
hosts_options(5), format of the language extensions.
inetd.conf(5), format of the inetd control file.
AUTHORS
Wietse Venema (wietse@wzv.win.tue.nl),
Department of Mathematics and Computing Science,
Eindhoven University of Technology
Den Dolech 2, P.O. Box 513,
5600 MB Eindhoven, The Netherlands
BUGS
If you specify FQDN hostname as client, they will be
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TCPDMATCH(8) TCPDMATCH(8)
recognized only as IPv4 or IPv6 address, which should be
recognized as both.
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