uucpd daemon - Invoke uucico for TCP/IP connections from remote UUCP systems

Format

uucpd [-l seconds] [-x debug_level]

Description

Warning: The uucpd daemon is by nature unsecure because it requires user authentication that uses cleartext sockets. A remote attacker can exploit this vulnerability to sniff logins and passwords. Do not use this daemon if possible.

The uucpd program allows remote uucico programs to communicate with local uucico in order to perform file transfers via TCP/IP connections. inetd starts uucpd when the remote uucico connects to the UUCP port. uucpd manages the login sequence with the remote uucico. After successful login, it then starts uucico to complete the transfer.

In order for inetd to start uucpd, the inetd configuration file (for example, inetd.conf) must contain a UUCP entry such as the following:

uucp  stream  tcp  nowait  OMVSKERN  /usr/sbin/uucpd  uucpd -l0debug_level

Options

-l seconds: Sets the login timeout value in seconds. When seconds are specified as zero, the login will wait without timing out.
-x: Invoke uucpd and uucico with the -x option. debug_level indicates the level of detail (0 has the least detail and 9 has the most detail). The uucpd login sequence debug output is written to a file in TMPDIR with a file name beginning with uucpd and followed by randomly generated characters. The uucico debug output is written to the UUCP log file.
Note: If you are using the -x option, monitor the UUCP logfile so that it does not become too large and fill up the file system.

The Permissions file provides an alternative method for setting debug for connections on a system-by-system basis. For more information about permissions, seeThe Permissions file in z/OS UNIX System Services Planning.

Usage notes

uucpd is not affected by the locale information that is specified in locale-related environment variables.

Exit values

0: Successful completion.
1: Failure to establish a connection with the remote system.
>1: uucico failure.

Portability

X/Open Portability GuideX/Open Portability Guide.

Related information

inetd, uucico, uucp, uux