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rlogind is invoked by inetd.8c when a remote login connection is established, and executes the following protocol:
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 terminal type, as found in the environment variable, TERM; see environ.5v
A facility to allow all data exchanges to be encrypted should be present.
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