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Name
rexec — return stream to a remote command
Synopsis
int
rexec( |
char ** |
ahost, |
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int |
inport, |
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char * |
user, |
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char * |
passwd, |
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char * |
cmd, |
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int * |
fd2p); |
DESCRIPTION
![[Note]](../stylesheet/note.png) |
Note |
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This interface is obsoleted by rcmd(3).
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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 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.
CONFORMING TO
Not in POSIX.1-2001. Present on the BSDs, Solaris, and
many other systems. The rexec()
function appeared in BSD4.2.
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.
SEE ALSO
rcmd(3), rexecd(8)
Copyright (c) 1983, 1991, 1993
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)rexec.3 8.1 (Berkeley) 6/4/93
$FreeBSD: src/lib/libcompat/4.3/rexec.3,v 1.12 2004/07/02 23:52:14 ru Exp $
Taken from FreeBSD 5.4; not checked against Linux reality (mtk)
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