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 specified, then these are used to authenticate to the foreign host; oth-
     erwise 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 command (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 authorization 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