rlogind(8)						      System Manager's Manual							rlogind(8)

NAME

       rlogind - The remote login server

SYNOPSIS

       rlogind [-aln]

FLAGS

       Requests  the addresses for the hostname, verifying that the name and address correspond.  Normal authentication is bypassed if the address
       verification fails.  Prevents authentication based on the user's $HOME/.rhosts file, unless the user is logging in as the superuser.   Dis-
       ables transport-level, keep-alive messages. The messages are enabled by default.

DESCRIPTION

       The rlogind daemon is the server for the rlogin(1) program.  The server provides a remote login facility with authentication based on priv-
       ileged port numbers from trusted hosts.

       The rlogind daemon listens for service requests at the port indicated in the login service specification; see services(4).  When a  service
       request	is received, the following protocol is initiated: The server checks the client's source port.  If the port is not in the range 512
       to 1023, the server aborts the connection.  The server checks the client's source address and  requests	the  corresponding  hostname  (see
       gethostbyaddr(3),  hosts(4)  and  named(8).   If  the hostname cannot be determined, the dot-notation representation of the host address is
       used.  If the hostname is in the same domain as the server (according to the last two components of the domain name), or if the -a flag	is
       given,  the addresses for the hostname are requested, verifying that the name and address correspond.  Normal authentication is bypassed if
       the address verification fails.

       Once the source port and address have been checked, rlogind proceeds with the authentication process described in rshd(8).  It  then  allo-
       cates  a pseudoterminal (see pty(7)), and manipulates file descriptors so that the slave half of the pseudoterminal becomes the stdin, std-
       out, and stderr for a login process.  The login process is an instance of the login(1) program invoked with the -f option if authentication
       has  succeeded.	 If  automatic authentication fails, the user is prompted to log in as if on a standard terminal line.	The -l option pre-
       vents any authentication based on the user's .rhosts file, unless the user is logging in as the superuser.

       By default, the rlogind daemon starts the login dialog using the login string specified in the message field of	the  /etc/gettydefs  file.
       If  you	want  to  use  a customized banner, create an /etc/issue.net or /etc/issue file. The rlogind daemon reads the file that exists and
       writes its contents to stdout prior to starting the login dialog. If both files exist, only the /etc/issue.net file is used.

       The parent of the login process manipulates the master side of the pseudoterminal, 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(7) is invoked to provide <Ctrl-
       s>/<Ctrl-q> type facilities and propagate interrupt signals to the remote programs.  The login process  propagates  the	client	terminal's
       baud  rate  and	terminal type, as found in the TERM environment variable.  The screen or window size of the terminal is requested from the
       client, and window size changes from the client are propagated to the pseudoterminal.

       Transport-level, keep-alive messages are enabled unless the -n flag is present.	The use of keep-alive messages allows sessions to be timed
       out if the client crashes or becomes unreachable.

       Note that 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.

DIAGNOSTICS

       All initial diagnostic messages are indicated by a leading byte with a value of 1 (one), after which any network  connections  are  closed.
       If there are no errors before login is invoked, a null byte is returned as an indication of success.  A fork by the server failed.

FILES

       Specifies the command path

RELATED INFORMATION

       Commands: login(1).

       Daemons: rshd(8).

       Files: issue(4), issue.net.

       Functions: ruserok(3).  delim off

																	rlogind(8)