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tcpdmatch - tcp wrapper oracle
tcpdmatch [-d] [-i inet_conf] daemon client
tcpdmatch [-d] [-i inet_conf] daemon[@server] [user@]client
tcpdmatch predicts how the tcp wrapper would handle a specific 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 additional information from your inetd or
tlid network configuration file.
When tcpdmatch finds a match in the access control tables, it identi-
fies the matched rule. In addition, it displays the optional shell com-
mands or options in a pretty-printed format; this makes it easier for
you to spot any discrepancies between what you want and what the pro-
The following two arguments are always required:
daemon A daemon process name. Typically, the last component of a daemon
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 predic-
tion for each address listed for that client.
When a client address is specified, tcpdmatch predicts 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
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 `unknown'.
-d Examine hosts.allow and hosts.deny files in the current direc-
tory instead of the default ones.
Specify this option when tcpdmatch is unable to find your
inetd.conf or tlid.conf network configuration file, or when you
suspect that the program uses the wrong one.
To predict how tcpd would handle a telnet request from the local sys-
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
tcpdmatch in.telnetd paranoid
On some systems, daemon names have no `in.' prefix, or tcpdmatch may
need some help to locate the inetd configuration file.
The default locations of the tcpd access control tables are:
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.
Wietse Venema (firstname.lastname@example.org),
Department of Mathematics and Computing Science,
Eindhoven University of Technology
Den Dolech 2, P.O. Box 513,
5600 MB Eindhoven, The Netherlands
If you specify FQDN hostname as client, they will be recognized only as
IPv4 or IPv6 address, which should be recognized as both.