tcpdmatch (8) - Linux Manuals
tcpdmatch: tcp wrapper oracle
NAME
tcpdmatch - tcp wrapper oracleSYNOPSYS
tcpdmatch [-d] daemon clienttcpdmatch [-d] daemon[@server] [user@]client
DESCRIPTION
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 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.
ARGUMENTS
The following two arguments are always required:- daemon
- A daemon process name. Typically, the last component 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 predicts what tcpd would do when client name lookup fails.
Optional information specified with the daemon [at] 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 [at] client form:
- user
- A client user identifier. Typically, a login name or a numeric userid. The default user name is `unknown'.
OPTIONS
- -d
- Examine hosts.allow and hosts.deny files in the current directory instead of the default ones.
EXAMPLES
To predict how tcpd would handle a telnet request from the local system:
The same request, pretending that hostname lookup failed:
To predict what tcpd would do when the client name does not match the
client address:
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:
/etc/hosts.allow
FILES
/etc/hosts.deny
AUTHORS
Wietse Venema (wietse [at] 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
SEE ALSO
hosts_access(5), format of the tcpd access control tables.
hosts_options(5), format of the language extensions.