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freebsd-dev/lib/libcompat/4.3/rexec.3

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BSD 4.4 Lite Lib Sources
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.\" 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
$Id$ -> $FreeBSD$
1999-08-28 00:22:10 +00:00
.\" $FreeBSD$
BSD 4.4 Lite Lib Sources
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.\"
.Dd June 4, 1993
.Dt REXEC 3
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.Os
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.Sh NAME
.Nm rexec
.Nd return stream to a remote command
Remove text saying "this is available from the compatibility library, libcompat" in favour of a .Sh LIBRARY section using the .Lb macro. Also add .Bf -symbolic around the text saying "this is obsolete" in re_comp.3. PR: 22675 Submitted by: Mike Meyer <mwm@mired.org> Reviewed by: sheldonh
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.Sh LIBRARY
.Lb libcompat
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.Sh SYNOPSIS
.Ft int
The implementation of rexec() missed the function ruserpass(), so the link stage fell over for any program that attempted to use rexec(). Ruserpass() remains undocumented; i could not find any documentation for it on other systems. Also added a BUGS section to the man page, stating that this function constitutes a potential security hole (as well as the underlying "exec" service). Submitted by: rgrimes Originally submitted by: agc@uts.amdahl.com (Alistair G. Crooks) Obtained from: netbsd-bugs@NetBSD.ORG
1995-04-11 19:52:10 +00:00
.Fn rexec "char **ahost" "int inport" "char *user" "char *passwd" "char *cmd" "int *fd2p"
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.Sh DESCRIPTION
.Bf -symbolic
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This interface is obsoleted by
Correct typo. PR: docs/9597 Submitted by: Christoph Kukulies <kuku@FreeBSD.ORG>
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.Xr rcmd 3 .
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.Ef
.Pp
The
.Fn rexec
function
looks up the host
.Fa *ahost
using
.Xr gethostbyname 3 ,
returning \-1 if the host does not exist.
Otherwise
.Fa *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
.Pa .netrc
file in his
home directory are searched for appropriate information.
If all this fails, the user is prompted for the information.
.Pp
The port
.Fa inport
specifies which well-known
.Tn DARPA
Internet port to use for
the connection; the call
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.Fn getservbyname \*qexec\*q \*qtcp\*q
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(see
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.Xr getservent 3 )
will return a pointer to a structure, which contains the
necessary port.
The protocol for connection is described in detail in
.Xr rexecd 8 .
.Pp
If the connection succeeds,
a socket in the Internet domain of type
.Dv SOCK_STREAM
is returned to
the caller, and given to the remote command as
Consistently mark std(in|out|err) with .Dv, because that's how they are marked up in stdio(3), and because they are defined expressions of type "FILE *". Approved by: re
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.Dv stdin
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and
Consistently mark std(in|out|err) with .Dv, because that's how they are marked up in stdio(3), and because they are defined expressions of type "FILE *". Approved by: re
2002-12-04 18:57:46 +00:00
.Dv stdout .
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If
.Fa fd2p
is non-zero, then an auxiliary channel to a control
process will be setup, and a descriptor for it will be placed
in
.Fa *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
mdoc(7) police: formatting nits. Approved by: re
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.Ux
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signal numbers, to be
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forwarded to the process group of the command.
The diagnostic
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information returned does not include remote authorization failure,
as the secondary connection is set up after authorization has been
verified.
If
.Fa fd2p
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is 0, then the
Consistently mark std(in|out|err) with .Dv, because that's how they are marked up in stdio(3), and because they are defined expressions of type "FILE *". Approved by: re
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.Dv stderr
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(unit 2 of the remote
Remove whitespace at EOL.
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command) will be made the same as the
Consistently mark std(in|out|err) with .Dv, because that's how they are marked up in stdio(3), and because they are defined expressions of type "FILE *". Approved by: re
2002-12-04 18:57:46 +00:00
.Dv stdout
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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.
.Sh SEE ALSO
.Xr rcmd 3 ,
.Xr rexecd 8
.Sh HISTORY
The
.Fn rexec
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function appeared in
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.Bx 4.2 .
The implementation of rexec() missed the function ruserpass(), so the link stage fell over for any program that attempted to use rexec(). Ruserpass() remains undocumented; i could not find any documentation for it on other systems. Also added a BUGS section to the man page, stating that this function constitutes a potential security hole (as well as the underlying "exec" service). Submitted by: rgrimes Originally submitted by: agc@uts.amdahl.com (Alistair G. Crooks) Obtained from: netbsd-bugs@NetBSD.ORG
1995-04-11 19:52:10 +00:00
.Sh BUGS
The
.Fn rexec
function sends the unencrypted password across the network.
.Pp
The underlying service is considered a big security hole and therefore
not enabled on many sites, see
.Xr rexecd 8
for explanations.
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