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<refentry id="smbd.8">
<refmeta>
<refentrytitle>smbd</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>smbd</refname>
<refpurpose>server to provide SMB/CIFS services to clients</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>smbd</command>
<arg choice="opt">-D</arg>
<arg choice="opt">-F</arg>
<arg choice="opt">-S</arg>
<arg choice="opt">-i</arg>
<arg choice="opt">-h</arg>
<arg choice="opt">-V</arg>
<arg choice="opt">-b</arg>
<arg choice="opt">-d <debug level></arg>
<arg choice="opt">-l <log directory></arg>
<arg choice="opt">-p <port number></arg>
<arg choice="opt">-O <socket option></arg>
<arg choice="opt">-s <configuration file></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
<para>This program is part of the <citerefentry><refentrytitle>Samba</refentrytitle>
<manvolnum>7</manvolnum></citerefentry> suite.</para>
<para><command>smbd</command> is the server daemon that
provides filesharing and printing services to Windows clients.
The server provides filespace and printer services to
clients using the SMB (or CIFS) protocol. This is compatible
with the LanManager protocol, and can service LanManager
clients. These include MSCLIENT 3.0 for DOS, Windows for
Workgroups, Windows 95/98/ME, Windows NT, Windows 2000,
OS/2, DAVE for Macintosh, and smbfs for Linux.</para>
<para>An extensive description of the services that the
server can provide is given in the man page for the
configuration file controlling the attributes of those
services (see <citerefentry><refentrytitle>smb.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>. This man page will not describe the
services, but will concentrate on the administrative aspects
of running the server.</para>
<para>Please note that there are significant security
implications to running this server, and the <citerefentry><refentrytitle>smb.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> manual page should be regarded as mandatory reading before
proceeding with installation.</para>
<para>A session is created whenever a client requests one.
Each client gets a copy of the server for each session. This
copy then services all connections made by the client during
that session. When all connections from its client are closed,
the copy of the server for that client terminates.</para>
<para>The configuration file, and any files that it includes,
are automatically reloaded every minute, if they change. You
can force a reload by sending a SIGHUP to the server. Reloading
the configuration file will not affect connections to any service
that is already established. Either the user will have to
disconnect from the service, or <command>smbd</command> killed and restarted.</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>-D</term>
<listitem><para>If specified, this parameter causes
the server to operate as a daemon. That is, it detaches
itself and runs in the background, fielding requests
on the appropriate port. Operating the server as a
daemon is the recommended way of running <command>smbd</command> for
servers that provide more than casual use file and
print services. This switch is assumed if <command>smbd
</command> is executed on the command line of a shell.
</para></listitem>
</varlistentry>
<varlistentry>
<term>-F</term>
<listitem><para>If specified, this parameter causes
the main <command>smbd</command> process to not daemonize,
i.e. double-fork and disassociate with the terminal.
Child processes are still created as normal to service
each connection request, but the main process does not
exit. This operation mode is suitable for running
<command>smbd</command> under process supervisors such
as <command>supervise</command> and <command>svscan</command>
from Daniel J. Bernstein's <command>daemontools</command>
package, or the AIX process monitor.
</para></listitem>
</varlistentry>
<varlistentry>
<term>-S</term>
<listitem><para>If specified, this parameter causes
<command>smbd</command> to log to standard output rather
than a file.</para></listitem>
</varlistentry>
<varlistentry>
<term>-i</term>
<listitem><para>If this parameter is specified it causes the
server to run "interactively", not as a daemon, even if the
server is executed on the command line of a shell. Setting this
parameter negates the implicit deamon mode when run from the
command line. <command>smbd</command> also logs to standard
output, as if the <command>-S</command> parameter had been
given.
</para></listitem>
</varlistentry>
&popt.common.samba;
&stdarg.help;
<varlistentry>
<term>-b</term>
<listitem><para>Prints information about how
Samba was built.</para></listitem>
</varlistentry>
<varlistentry>
<term>-l <log directory></term>
<listitem><para>If specified,
<replaceable>log directory</replaceable>
specifies a log directory into which the "log.smbd" log
file will be created for informational and debug
messages from the running server. The log
file generated is never removed by the server although
its size may be controlled by the
<smbconfoption><name>max log size</name></smbconfoption>
option in the <citerefentry><refentrytitle>smb.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> file. <emphasis>Beware:</emphasis>
If the directory specified does not exist, <command>smbd</command>
will log to the default debug log location defined at compile time.
</para>
<para>The default log directory is specified at
compile time.</para></listitem>
</varlistentry>
<varlistentry>
<term>-p <port number></term>
<listitem><para><replaceable>port number</replaceable> is a positive integer
value. The default value if this parameter is not
specified is 139.</para>
<para>This number is the port number that will be
used when making connections to the server from client
software. The standard (well-known) port number for the
SMB over TCP is 139, hence the default. If you wish to
run the server as an ordinary user rather than
as root, most systems will require you to use a port
number greater than 1024 - ask your system administrator
for help if you are in this situation.</para>
<para>In order for the server to be useful by most
clients, should you configure it on a port other
than 139, you will require port redirection services
on port 139, details of which are outlined in rfc1002.txt
section 4.3.5.</para>
<para>This parameter is not normally specified except
in the above situation.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>FILES</title>
<variablelist>
<varlistentry>
<term><filename>/etc/inetd.conf</filename></term>
<listitem><para>If the server is to be run by the
<command>inetd</command> meta-daemon, this file
must contain suitable startup information for the
meta-daemon.
</para></listitem>
</varlistentry>
<varlistentry>
<term><filename>/etc/rc</filename></term>
<listitem><para>or whatever initialization script your
system uses).</para>
<para>If running the server as a daemon at startup,
this file will need to contain an appropriate startup
sequence for the server. </para></listitem>
</varlistentry>
<varlistentry>
<term><filename>/etc/services</filename></term>
<listitem><para>If running the server via the
meta-daemon <command>inetd</command>, this file
must contain a mapping of service name (e.g., netbios-ssn)
to service port (e.g., 139) and protocol type (e.g., tcp).
</para></listitem>
</varlistentry>
<varlistentry>
<term><filename>/usr/local/samba/lib/smb.conf</filename></term>
<listitem><para>This is the default location of the <citerefentry><refentrytitle>smb.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> server configuration file. Other common places that systems
install this file are <filename>/usr/samba/lib/smb.conf</filename>
and <filename>/etc/samba/smb.conf</filename>.</para>
<para>This file describes all the services the server
is to make available to clients. See <citerefentry><refentrytitle>smb.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> for more information.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>LIMITATIONS</title>
<para>On some systems <command>smbd</command> cannot change uid back
to root after a setuid() call. Such systems are called
trapdoor uid systems. If you have such a system,
you will be unable to connect from a client (such as a PC) as
two different users at once. Attempts to connect the
second user will result in access denied or
similar.</para>
</refsect1>
<refsect1>
<title>ENVIRONMENT VARIABLES</title>
<variablelist>
<varlistentry>
<term><envar>PRINTER</envar></term>
<listitem><para>If no printer name is specified to
printable services, most systems will use the value of
this variable (or <constant>lp</constant> if this variable is
not defined) as the name of the printer to use. This
is not specific to the server, however.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>PAM INTERACTION</title>
<para>Samba uses PAM for authentication (when presented with a plaintext
password), for account checking (is this account disabled?) and for
session management. The degree too which samba supports PAM is restricted
by the limitations of the SMB protocol and the <smbconfoption><name>obey pam restrictions</name></smbconfoption> <citerefentry><refentrytitle>smb.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> paramater. When this is set, the following restrictions apply:
</para>
<itemizedlist>
<listitem><para><emphasis>Account Validation</emphasis>: All accesses to a
samba server are checked
against PAM to see if the account is vaild, not disabled and is permitted to
login at this time. This also applies to encrypted logins.
</para></listitem>
<listitem><para><emphasis>Session Management</emphasis>: When not using share
level secuirty, users must pass PAM's session checks before access
is granted. Note however, that this is bypassed in share level secuirty.
Note also that some older pam configuration files may need a line
added for session support.
</para></listitem>
</itemizedlist>
</refsect1>
<refsect1>
<title>VERSION</title>
<para>This man page is correct for version 3.0 of
the Samba suite.</para>
</refsect1>
<refsect1>
<title>DIAGNOSTICS</title>
<para>Most diagnostics issued by the server are logged
in a specified log file. The log file name is specified
at compile time, but may be overridden on the command line.</para>
<para>The number and nature of diagnostics available depends
on the debug level used by the server. If you have problems, set
the debug level to 3 and peruse the log files.</para>
<para>Most messages are reasonably self-explanatory. Unfortunately,
at the time this man page was created, there are too many diagnostics
available in the source code to warrant describing each and every
diagnostic. At this stage your best bet is still to grep the
source code and inspect the conditions that gave rise to the
diagnostics you are seeing.</para>
</refsect1>
<refsect1>
<title>SIGNALS</title>
<para>Sending the <command>smbd</command> a SIGHUP will cause it to
reload its <filename>smb.conf</filename> configuration
file within a short period of time.</para>
<para>To shut down a user's <command>smbd</command> process it is recommended
that <command>SIGKILL (-9)</command> <emphasis>NOT</emphasis>
be used, except as a last resort, as this may leave the shared
memory area in an inconsistent state. The safe way to terminate
an <command>smbd</command> is to send it a SIGTERM (-15) signal and wait for
it to die on its own.</para>
<para>The debug log level of <command>smbd</command> may be raised
or lowered using <citerefentry><refentrytitle>smbcontrol</refentrytitle>
<manvolnum>1</manvolnum></citerefentry> program (SIGUSR[1|2] signals are no longer
used since Samba 2.2). This is to allow transient problems to be diagnosed,
whilst still running at a normally low log level.</para>
<para>Note that as the signal handlers send a debug write,
they are not re-entrant in <command>smbd</command>. This you should wait until
<command>smbd</command> is in a state of waiting for an incoming SMB before
issuing them. It is possible to make the signal handlers safe
by un-blocking the signals before the select call and re-blocking
them after, however this would affect performance.</para>
</refsect1>
<refsect1>
<title>SEE ALSO</title>
<para><citerefentry><refentrytitle>hosts_access</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>, <citerefentry><refentrytitle>inetd</refentrytitle>
<manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>nmbd</refentrytitle>
<manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>smb.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>, <citerefentry><refentrytitle>smbclient</refentrytitle>
<manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>testparm</refentrytitle>
<manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>testprns</refentrytitle>
<manvolnum>1</manvolnum></citerefentry>, and the
Internet RFC's <filename>rfc1001.txt</filename>, <filename>rfc1002.txt</filename>.
In addition the CIFS (formerly SMB) specification is available
as a link from the Web page <ulink noescape="1" url="http://samba.org/cifs/">
http://samba.org/cifs/</ulink>.</para>
</refsect1>
<refsect1>
<title>AUTHOR</title>
<para>The original Samba software and related utilities
were created by Andrew Tridgell. Samba is now developed
by the Samba Team as an Open Source project similar
to the way the Linux kernel is developed.</para>
<para>The original Samba man pages were written by Karl Auer.
The man page sources were converted to YODL format (another
excellent piece of Open Source software, available at <ulink url="ftp://ftp.icce.rug.nl/pub/unix/">
ftp://ftp.icce.rug.nl/pub/unix/</ulink>) and updated for the Samba 2.0
release by Jeremy Allison. The conversion to DocBook for
Samba 2.2 was done by Gerald Carter. The conversion to DocBook XML 4.2 for
Samba 3.0 was done by Alexander Bokovoy.</para>
</refsect1>
</refentry>