ggate/ggatessh/ggatessh.8

.\" Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
.\"
.\" $FreeBSD$
.\"
.Dd October 21, 2020
.Dt GGATESSH 8
.Os
.Sh NAME
.Nm ggatessh
.Nd "GEOM Gate SSH/SFTP client and control utility"
.Sh SYNOPSIS
.Nm
.Cm create
.Op Fl v
.Op Fl o Cm ro | wo | rw
.Op Fl F Ar pidfile
.Op Fl i Ar identifyfile
.Op Fl l Ar username
.Op Fl p Ar port
.Op Fl q Ar queue_size
.Op Fl s Ar sectorsize
.Op Fl r Ar nrequests
.Op Fl t Ar timeout
.Op Fl u Ar unit
.Ar host
.Ar path
.Nm
.Cm rescue
.Op Fl v
.Op Fl o Cm ro | wo | rw
.Op Fl F Ar pidfile
.Op Fl i Ar identifyfile
.Op Fl l Ar username
.Op Fl p Ar port
.Op Fl r Ar nrequests
.Fl u Ar unit
.Ar host
.Ar path
.Nm
.Cm destroy
.Op Fl f
.Fl u Ar unit
.Nm
.Cm list
.Op Fl v
.Op Fl u Ar unit
.Sh DESCRIPTION
The
.Nm
utility is a network client for the GEOM Gate class.
It is responsible for the creation of
.Nm ggate
devices and forwarding I/O requests between the GEOM Gate
kernel subsystem and an
.Xr sftp-server 8
over SSH.
.Pp
Available commands:
.Bl -tag -width ".Cm destroy"
.It Cm create
Connect to an
.Xr sftp-server 8
via SSH on the specified host and create a
.Nm ggate
provider for the specified remote file or device.
.It Cm rescue
Create a new connection after the
.Nm
process has died or has been killed.
The new connection to the
.Xr sftp-server 8
handles pending and future requests.
If the remote file has changed in size, the ggate device
will be resized to match the new remote size.
.It Cm destroy
Destroy the given
.Nm ggate
provider.
.It Cm list
List
.Nm ggate
providers.
.El
.Pp
Available options:
.Bl -tag -width ".Fl s Cm ro | wo | rw"
.It Fl F Ar pidfile
Write out the daemon's pid to
.Ar pidfile .
The default is
.Pa /var/run/ggatessh.ggate<unit>.pid .
.It Fl f
Forcibly destroy
.Nm ggate
provider (cancels all pending requests).
.It Fl i Ar identityfile
The path to the identity file to use for ssh public key authentication.
If the
.Ar identityfile
is not specified, the default of
.Pa $HOME/.ssh/id_rsa
will be used.
.It Fl l Ar username
The user name to authentice to the server with.
If
.Ar username
is not specified, the default will be
.Ev $USER .
.It Fl o Cm ro | wo | rw
Specify permissions to use when opening the file or device: read-only
.Pq Cm ro ,
write-only
.Pq Cm wo ,
or read-write
.Pq Cm rw .
Default is
.Cm rw .
.It Fl p Ar port
Port to connect to on the remote host.
Default is 22.
.It Fl q Ar queue_size
Number of pending I/O requests that can be queued before they will
start to be canceled.
Default is 1024.
.It Fl r Ar nrequests
Specifies how many requests may be outstanding at a single time.
This determines that maximum number of connections to the
.Xr sftp-server 8
that will be established at a time.
If unspecified, the default is 32.
.It Fl s Ar sectorsize
Sector size for
.Nm ggate
provider.
If not specified, it is taken from the device, or set to 512 bytes for files.
.It Fl t Ar timeout
Number of seconds to wait before an I/O request will be canceled.
Default is 0, which means no timeout.
.It Fl u Ar unit
Unit number to use.
.It Fl v
Do not fork, run in foreground and print debug information on standard
output.
.It Ar host
Remote SSH server to connect to.
.It Ar path
Path to a regular file or device on the remote host.
.El
.Sh EXIT STATUS
Exit status is 0 on success, or 1 if the command fails.
To get details about the failure,
.Nm
should be called with the
.Fl v
option.
.Sh EXAMPLES
Use a CD-ROM device on a remote host.
.Bd -literal -offset indent
server# cat /etc/gg.exports
client RO /dev/cd0
server# ggated

client# ggatec create -o ro server /dev/cd0
ggate0
client# mount_cd9660 /dev/ggate0 /cdrom
.Ed
.Sh SEE ALSO
.Xr geom 4 ,
.Xr ggatessh 7 ,
.Xr ggated 8 ,
.Xr ggatel 8 ,
.Xr mount_cd9660 8
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 5.3 .
.Sh AUTHORS
The
.Nm
utility as well as this manual page was written by
.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org .