d2730d5b27
Bring in updated jail support from bz_jail branch. This enhances the current jail implementation to permit multiple addresses per jail. In addtion to IPv4, IPv6 is supported as well. Due to updated checks it is even possible to have jails without an IP address at all, which basically gives one a chroot with restricted process view, no networking,.. SCTP support was updated and supports IPv6 in jails as well. Cpuset support permits jails to be bound to specific processor sets after creation. Jails can have an unrestricted (no duplicate protection, etc.) name in addition to the hostname. The jail name cannot be changed from within a jail and is considered to be used for management purposes or as audit-token in the future. DDB 'show jails' command was added to aid debugging. Proper compat support permits 32bit jail binaries to be used on 64bit systems to manage jails. Also backward compatibility was preserved where possible: for jail v1 syscalls, as well as with user space management utilities. Both jail as well as prison version were updated for the new features. A gap was intentionally left as the intermediate versions had been used by various patches floating around the last years. Bump __FreeBSD_version for the afore mentioned and in kernel changes. Special thanks to: - Pawel Jakub Dawidek (pjd) for his multi-IPv4 patches and Olivier Houchard (cognet) for initial single-IPv6 patches. - Jeff Roberson (jeff) and Randall Stewart (rrs) for their help, ideas and review on cpuset and SCTP support. - Robert Watson (rwatson) for lots and lots of help, discussions, suggestions and review of most of the patch at various stages. - John Baldwin (jhb) for his help. - Simon L. Nielsen (simon) as early adopter testing changes on cluster machines as well as all the testers and people who provided feedback the last months on freebsd-jail and other channels. - My employer, CK Software GmbH, for the support so I could work on this. Reviewed by: (see above) MFC after: 3 months (this is just so that I get the mail) X-MFC Before: 7.2-RELEASE if possible
95 lines
2.8 KiB
Groff
95 lines
2.8 KiB
Groff
.\"
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.\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 29, 2008
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.Dt JEXEC 8
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.Os
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.Sh NAME
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.Nm jexec
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.Nd "execute a command inside an existing jail"
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.Sh SYNOPSIS
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.Nm
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.Op Fl u Ar username | Fl U Ar username
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.Op Fl n Ar jailname
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.Ar jid command ...
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.Sh DESCRIPTION
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The
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.Nm
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utility executes
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.Ar command
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inside the jail identified by either
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.Ar jailname
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or
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.Ar jid
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or both.
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.Pp
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If the jail cannot be identified uniquely by the given parameters,
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an error message is printed.
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.Nm
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will also check the state of the jail (once supported) to be
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.Dv ALIVE
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and ignore jails in other states.
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The mandatory argument
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.Ar jid
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is the unique jail identifier as given by
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.Xr jls 8 .
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In case you only want to match on other criteria, give an empty string.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl n Ar jailname
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The name of the jail, if given upon creation of the jail.
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This is not the hostname of the jail.
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.It Fl u Ar username
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The user name from host environment as whom the
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.Ar command
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should run.
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.It Fl U Ar username
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The user name from jailed environment as whom the
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.Ar command
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should run.
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.El
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.Sh SEE ALSO
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.Xr jail_attach 2 ,
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.Xr jail 8 ,
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.Xr jls 8
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.Sh HISTORY
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The
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.Nm
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utility was added in
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.Fx 5.1 .
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.Sh BUGS
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If the jail is not identified by
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.Ar jid
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there is a possible race in between the lookup of the jail
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and executing the command inside the jail.
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Giving a
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.Ar jid
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has a similar race as another process can stop the jail and
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start another one after the user looked up the
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.Ar jid .
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