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tcpdmatch

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The tcpdmatch utility enables you to test specific examples against your configuration files. Again, tcpdmatch enables you to test against a hosts.allow file in your current directory by specifying the -d option. It also recognizes the -i/path/to/inetd.conf if tcpdmatch has trouble finding it.

tcpdmatch [-d] [-i inet_conf] daemon[@server] [user@client]

The program examines the tcpd access control tables (default /etc/inet/hosts.allow and /etc/inet/hosts.deny) and prints its conclusion. For maximum accuracy, it extracts additional information from your inetd network configuration 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 discrepancies between what you want and what the program understands.

The following two arguments are always required:

daemon[@server]: A daemon process name. Typically, the last component of a daemon executable pathname.
The optionally specified server may be a host name or network address, or one of the unknown or paranoid wildcard patterns. The default server name is `unknown'.
[user@]client: A host name or network address, or one of the unknown or paranoid wildcard patterns.
The optionally specified user is a client user identifier, typically, a login name or a numeric userid. The default user name is unknown.

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 predicts what tcpd would do when client name lookup fails.

Options

tcpdmatch understands the following 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 network configuration file, or when you suspect that the program uses the wrong one.

References

hosts_access(4tcp), inetd.conf(4tcp), tcpdchk(1Mtcp)

Author

Wietse Venema ([email protected]),
Department of Mathematics and Computing Science,
Eindhoven University of Technology
Den Dolech 2, P.O. Box 513,
5600 MB Eindhoven, The Netherlands

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

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Last modified: March 12, 2019