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The try-from Utility

The try-from utility identifies the detailed information regarding to a connection. This utility must be called via a remote shell command to determine if the host name and the address are recognized properly, and also if the user name lookup works.

The try-from utility can be executed from the command line as follows:

# remsh host /usr/bin/try-from

When the try-from utility is invoked, it prints the following output:

client address        (%a):
client hostname       (%n):
client username       (%u):
client info           (%c):
server address        (%A):
server hostname       (%N):
server process        (%d):
server info             (%s):

The client information describes how the remote host recognizes the client in terms of an address, name, and user name, whereas, the server information describes the remote host.

For more information on % <letter> expressions, type man 5 hosts_access at the prompt.

Author

Old News ;-)

Man page of TRY-FROM

try-from - test program for the tcp_wrapper  

try-from  

The try-from command can be called via a remote shell command to find out if the hostname and address are properly recognized by the tcp_wrapper library, if username lookup works, and (SysV only) if the TLI on top of IP heuristics work. Diagnostics are reported through syslog(3) and redirected to stderr.

Example:

rsh host /some/where/try-from

See also

hosts_access(5), hosts_options(5), tcpd(8)  

Wietse Venema, Eindhoven University of Technology, The Netherlands.

Recommended Links

TCP Wrappers Files

TCP Wrappers Release Notes