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REXEC(3)		   Linux Programmers Manual		     REXEC(3)

       rexec - return stream to a remote command

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

       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;
       otherwise  the  environment and then the users .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  getser
       vent(3))  will return a pointer to a structure that contains the neces
       sary port.  The protocol for connection is described in detail in  rex

       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 std
       out 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.

       Not in POSIX.1-2001.  Present on the BSDs, Solaris, and many other sys
       tems.  The rexec() function appeared in 4.2BSD.

       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.

       rcmd(3), rexecd(8)

       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2007-12-28			      REXEC(3)

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