.\" Copyright (c) 2012 The FreeBSD Foundation
.\"
.\" This software was developed by Edward Tomasz Napierala under sponsorship
.\" from the FreeBSD Foundation.
.\"
.\" 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 March 31, 2020
.Dt CTLD 8
.Os
.Sh NAME
.Nm ctld
.Nd CAM Target Layer / iSCSI target daemon
.Sh SYNOPSIS
.Nm
.Op Fl d
.Op Fl f Ar config-file
.Op Fl u
.Nm
.Fl t
.Op Fl f Ar config-file
.Op Fl u
.Sh DESCRIPTION
The
.Nm
daemon is responsible for managing the CAM Target Layer configuration,
accepting incoming iSCSI connections, performing authentication and
passing connections to the kernel part of the native iSCSI target.
.Pp
Upon startup, the
.Nm
daemon parses the configuration file.
If it encounters any errors,
.Nm
exits.
It then compares the configuration with the kernel list of LUNs managed
by previously running
.Nm
instances, removes LUNs no longer existing in the configuration file,
and creates new LUNs as necessary.
After that it listens for the incoming iSCSI connections, performs
authentication, and, if successful, passes the connections to the kernel part
of CTL iSCSI target,
.Xr cfiscsi 4 ,
which handles it from that point.
.Pp
When it receives a SIGHUP signal, the
.Nm
reloads its configuration and applies the changes to the kernel.
Changes are applied in a way that avoids unnecessary disruptions;
for example removing one LUN does not affect other LUNs.
.Pp
When exiting gracefully, the
.Nm
daemon removes LUNs it managed and forcibly disconnects all the clients.
Otherwise - for example, when killed with SIGKILL - LUNs stay configured
and clients remain connected.
.Pp
To perform administrative actions that apply to already connected
sessions, such as forcing termination, use
.Xr ctladm 8 .
.Pp
The following options are available:
.Bl -tag -width ".Fl P Ar pidfile"
.It Fl f Ar config-file
Specifies the name of the configuration file.
The default is
.Pa /etc/ctl.conf .
.It Fl d
Debug mode.
The daemon sends verbose debug output to standard error, and does not
put itself in the background.
The daemon will also not fork and will exit after processing one connection.
This option is only intended for debugging the target.
.It Fl t
Test the configuration file for validity and exit.
.It Fl u
Use UCL configuration file format instead of the traditional non-UCL format.
.El
.Sh FILES
.Bl -tag -width ".Pa /var/run/ctld.pid" -compact
.It Pa /etc/ctl.conf
The configuration file for
.Nm .
The file format and configuration options are described in
.Xr ctl.conf 5 .
.It Pa /var/run/ctld.pid
The default location of the
.Nm
PID file.
.El
.Sh EXIT STATUS
The
.Nm
utility exits 0 on success, and >0 if an error occurs.
.Sh SEE ALSO
.Xr cfiscsi 4 ,
.Xr ctl 4 ,
.Xr ctl.conf 5 ,
.Xr ctladm 8 ,
.Xr ctlstat 8
.Sh HISTORY
The
.Nm
command appeared in
.Fx 10.0 .
.Sh AUTHORS
The
.Nm
was developed by
.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org
under sponsorship from the FreeBSD Foundation.