rlogind, in.rlogind - remote login server
rlogind is the server for the rlogin(1C) program. The server provides
a remote login facility with authentication based on privileged port
rlogind is invoked by inetd(8C) when a remote login connection is
established, and executes the following protocol:
o The server checks the client's source port. If the port is not
in the range 0-1023, the server aborts the connection. The
client's address and port number are passed as arguments to
rlogind by inetd in the form host.port with host in hex and port
o The server checks the client's source address. If the address
is associated with a host for which no corresponding entry
exists in the host name data base (see hosts(5)), the server
aborts the connection.
Once the source port and address have been checked, rlogind allocates a
pseudo-terminal (see pty(4)), and manipulates file descriptors so that
the slave half of the pseudo-terminal becomes the stdin, stdout, and
stderr for a login process. The login process is an instance of the
login(1) program, invoked with the -r option. The login process then
proceeds with the authentication process as described in rshd(8C), but
if automatic authentication fails, it reprompts the user to login as
one finds on a standard terminal line.
The parent of the login process manipulates the master side of the
pseudo-terminal, operating as an intermediary between the login process
and the client instance of the rlogin program. In normal operation,
the packet protocol described in pty(4) is invoked to provide ^S/^Q
type facilities and propagate interrupt signals to the remote programs.
The login process propagates the client terminal's baud rate and termi-
nal type, as found in the environment variable, TERM; see environ(5V).
All diagnostic messages are returned on the connection associated with
the stderr, after which any network connections are closed. An error
is indicated by a leading byte with a value of 1.
Hostname for your address unknown.
No entry in the host name database existed for the client's
A fork by the server failed.
The user's login shell could not be started.
The authentication procedure used here assumes the integrity of each
client machine and the connecting medium. This is insecure, but is
useful in an "open" environment.
A facility to allow all data exchanges to be encrypted should be
9 September 1987 RLOGIND(8C)