rexec man page on FreeBSD

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REXEC(3)		 BSD Library Functions Manual		      REXEC(3)

NAME
     rexec — return stream to a remote command

LIBRARY
     Compatibility Library (libcompat, -lcompat)

SYNOPSIS
     int
     rexec(char **ahost, int inport, char *user, char *passwd, char *cmd,
	 int *fd2p);

DESCRIPTION
     This interface is obsoleted by rcmd(3).

     The rexec() function looks up the host *ahost using gethostbyname(3),
     returning -1 if the host does not exist.  Otherwise *ahost is set to the
     standard name of the host.	 If a username and password are both speci‐
     fied, then these are used to authenticate to the foreign host; otherwise
     the environment and then the user's .netrc file in his home directory are
     searched for appropriate information.  If all this fails, the user is
     prompted for the information.

     The port inport specifies which well-known DARPA Internet port to use for
     the connection; the call getservbyname("exec", "tcp") (see getservent(3))
     will return a pointer to a structure, which contains the necessary port.
     The protocol for connection is described in detail in rexecd(8).

     If the connection succeeds, a socket in the Internet domain of type
     SOCK_STREAM is returned to the caller, and given to the remote command as
     stdin and stdout.	If fd2p is non-zero, then an auxiliary channel to a
     control process will be setup, and a descriptor for it will be placed in
     *fd2p.  The control process will return diagnostic output from the com‐
     mand (unit 2) on this channel, and will also accept bytes on this channel
     as being UNIX signal numbers, to be forwarded to the process group of the
     command.  The diagnostic information returned does not include remote
     authorization failure, as the secondary connection is set up after autho‐
     rization has been verified.  If fd2p is 0, then the stderr (unit 2 of the
     remote command) will be made the same as the stdout and no provision is
     made for sending arbitrary signals to the remote process, although you
     may be able to get its attention by using out-of-band data.

SEE ALSO
     rcmd(3), rexecd(8)

HISTORY
     The rexec() function appeared in 4.2BSD.

BUGS
     The rexec() function sends the unencrypted password across the network.

     The underlying service is considered a big security hole and therefore
     not enabled on many sites, see rexecd(8) for explanations.

BSD				 June 4, 1993				   BSD
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