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-<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>smbd</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="smbd"><a name="smbd.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>smbd &#8212; server to provide SMB/CIFS services to clients</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="literal">smbd</code> [-D] [-F] [-S] [-i] [-h] [-V] [-b] [-d &lt;debug level&gt;] [-l &lt;log directory&gt;] [-p &lt;port number(s)&gt;] [-P &lt;profiling level&gt;] [-O &lt;socket option&gt;] [-s &lt;configuration file&gt;]</p></div></div><div class="refsect1" title="DESCRIPTION"><a name="id266894"></a><h2>DESCRIPTION</h2><p>This program is part of the <a class="citerefentry" href="samba.7.html"><span class="citerefentry"><span class="refentrytitle">samba</span>(7)</span></a> suite.</p><p><code class="literal">smbd</code> 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.</p><p>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 <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a>. This man page will not describe the
- services, but will concentrate on the administrative aspects
- of running the server.</p><p>Please note that there are significant security
- implications to running this server, and the <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> manual page should be regarded as mandatory reading before
- proceeding with installation.</p><p>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.</p><p>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 <code class="literal">smbd</code> killed and restarted.</p></div><div class="refsect1" title="OPTIONS"><a name="id265771"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">-D</span></dt><dd><p>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 <code class="literal">smbd</code> for
- servers that provide more than casual use file and
- print services. This switch is assumed if <code class="literal">smbd
- </code> is executed on the command line of a shell.
- </p></dd><dt><span class="term">-F</span></dt><dd><p>If specified, this parameter causes
- the main <code class="literal">smbd</code> 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
- <code class="literal">smbd</code> under process supervisors such
- as <code class="literal">supervise</code> and <code class="literal">svscan</code>
- from Daniel J. Bernstein's <code class="literal">daemontools</code>
- package, or the AIX process monitor.
- </p></dd><dt><span class="term">-S</span></dt><dd><p>If specified, this parameter causes
- <code class="literal">smbd</code> to log to standard output rather
- than a file.</p></dd><dt><span class="term">-i</span></dt><dd><p>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 daemon mode when run from the
- command line. <code class="literal">smbd</code> also logs to standard
- output, as if the <code class="literal">-S</code> parameter had been
- given.
- </p></dd><dt><span class="term">-d|--debuglevel=level</span></dt><dd><p><em class="replaceable"><code>level</code></em> is an integer
-from 0 to 10. The default value if this parameter is
-not specified is 0.</p><p>The higher this value, the more detail will be
-logged to the log files about the activities of the
-server. At level 0, only critical errors and serious
-warnings will be logged. Level 1 is a reasonable level for
-day-to-day running - it generates a small amount of
-information about operations carried out.</p><p>Levels above 1 will generate considerable
-amounts of log data, and should only be used when
-investigating a problem. Levels above 3 are designed for
-use only by developers and generate HUGE amounts of log
-data, most of which is extremely cryptic.</p><p>Note that specifying this parameter here will
-override the <a class="link" href="smb.conf.5.html#" target="_top"></a> parameter
-in the <code class="filename">smb.conf</code> file.</p></dd><dt><span class="term">-V|--version</span></dt><dd><p>Prints the program version number.
-</p></dd><dt><span class="term">-s|--configfile &lt;configuration file&gt;</span></dt><dd><p>The file specified contains the
-configuration details required by the server. The
-information in this file includes server-specific
-information such as what printcap file to use, as well
-as descriptions of all the services that the server is
-to provide. See <code class="filename">smb.conf</code> for more information.
-The default configuration file name is determined at
-compile time.</p></dd><dt><span class="term">-l|--log-basename=logdirectory</span></dt><dd><p>Base directory name for log/debug files. The extension
-<code class="constant">".progname"</code> will be appended (e.g. log.smbclient,
-log.smbd, etc...). The log file is never removed by the client.
-</p></dd><dt><span class="term">-h|--help</span></dt><dd><p>Print a summary of command line options.
-</p></dd><dt><span class="term">-b</span></dt><dd><p>Prints information about how
- Samba was built.</p></dd><dt><span class="term">-p|--port&lt;port number(s)&gt;</span></dt><dd><p><em class="replaceable"><code>port number(s)</code></em> is a
- space or comma-separated list of TCP ports smbd should listen on.
- The default value is taken from the <a class="link" href="smb.conf.5.html#PORTS" target="_top">ports</a> parameter in <code class="filename">smb.conf</code></p><p>The default ports are 139 (used for SMB over NetBIOS over TCP)
- and port 445 (used for plain SMB over TCP).
- </p></dd><dt><span class="term">-P|--profiling-level&lt;profiling level&gt;</span></dt><dd><p><em class="replaceable"><code>profiling level</code></em> is a
- number specifying the level of profiling data to be collected.
- 0 turns off profiling, 1 turns on counter profiling only,
- 2 turns on complete profiling, and 3 resets all profiling data.
- </p></dd></dl></div></div><div class="refsect1" title="FILES"><a name="id307208"></a><h2>FILES</h2><div class="variablelist"><dl><dt><span class="term"><code class="filename">/etc/inetd.conf</code></span></dt><dd><p>If the server is to be run by the
- <code class="literal">inetd</code> meta-daemon, this file
- must contain suitable startup information for the
- meta-daemon.
- </p></dd><dt><span class="term"><code class="filename">/etc/rc</code></span></dt><dd><p>or whatever initialization script your
- system uses).</p><p>If running the server as a daemon at startup,
- this file will need to contain an appropriate startup
- sequence for the server. </p></dd><dt><span class="term"><code class="filename">/etc/services</code></span></dt><dd><p>If running the server via the
- meta-daemon <code class="literal">inetd</code>, 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).
- </p></dd><dt><span class="term"><code class="filename">/usr/local/samba/lib/smb.conf</code></span></dt><dd><p>This is the default location of the <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> server configuration file. Other common places that systems
- install this file are <code class="filename">/usr/samba/lib/smb.conf</code>
- and <code class="filename">/etc/samba/smb.conf</code>.</p><p>This file describes all the services the server
- is to make available to clients. See <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> for more information.</p></dd></dl></div></div><div class="refsect1" title="LIMITATIONS"><a name="id307320"></a><h2>LIMITATIONS</h2><p>On some systems <code class="literal">smbd</code> 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.</p></div><div class="refsect1" title="ENVIRONMENT VARIABLES"><a name="id307338"></a><h2>ENVIRONMENT VARIABLES</h2><div class="variablelist"><dl><dt><span class="term"><code class="envar">PRINTER</code></span></dt><dd><p>If no printer name is specified to
- printable services, most systems will use the value of
- this variable (or <code class="constant">lp</code> if this variable is
- not defined) as the name of the printer to use. This
- is not specific to the server, however.</p></dd></dl></div></div><div class="refsect1" title="PAM INTERACTION"><a name="id307364"></a><h2>PAM INTERACTION</h2><p>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 <a class="link" href="smb.conf.5.html#OBEYPAMRESTRICTIONS" target="_top">obey pam restrictions</a> <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> parameter. When this is set, the following restrictions apply:
- </p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><span class="emphasis"><em>Account Validation</em></span>: All accesses to a
- samba server are checked
- against PAM to see if the account is valid, not disabled and is permitted to
- login at this time. This also applies to encrypted logins.
- </p></li><li class="listitem"><p><span class="emphasis"><em>Session Management</em></span>: When not using share
- level security, users must pass PAM's session checks before access
- is granted. Note however, that this is bypassed in share level security.
- Note also that some older pam configuration files may need a line
- added for session support.
- </p></li></ul></div></div><div class="refsect1" title="VERSION"><a name="id307412"></a><h2>VERSION</h2><p>This man page is correct for version 3 of
- the Samba suite.</p></div><div class="refsect1" title="DIAGNOSTICS"><a name="id307421"></a><h2>DIAGNOSTICS</h2><p>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.</p><p>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.</p><p>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.</p></div><div class="refsect1" title="TDB FILES"><a name="id307444"></a><h2>TDB FILES</h2><p>Samba stores it's data in several TDB (Trivial Database) files, usually located in <code class="filename">/var/lib/samba</code>.</p><p>
- (*) information persistent across restarts (but not
- necessarily important to backup).
- </p><div class="variablelist"><dl><dt><span class="term">account_policy.tdb*</span></dt><dd><p>NT account policy settings such as pw expiration, etc...</p></dd><dt><span class="term">brlock.tdb</span></dt><dd><p>byte range locks</p></dd><dt><span class="term">browse.dat</span></dt><dd><p>browse lists</p></dd><dt><span class="term">connections.tdb</span></dt><dd><p>share connections (used to enforce max connections, etc...)</p></dd><dt><span class="term">gencache.tdb</span></dt><dd><p>generic caching db</p></dd><dt><span class="term">group_mapping.tdb*</span></dt><dd><p>group mapping information</p></dd><dt><span class="term">locking.tdb</span></dt><dd><p>share modes &amp; oplocks</p></dd><dt><span class="term">login_cache.tdb*</span></dt><dd><p>bad pw attempts</p></dd><dt><span class="term">messages.tdb</span></dt><dd><p>Samba messaging system</p></dd><dt><span class="term">netsamlogon_cache.tdb*</span></dt><dd><p>cache of user net_info_3 struct from net_samlogon() request (as a domain member)</p></dd><dt><span class="term">ntdrivers.tdb*</span></dt><dd><p>installed printer drivers</p></dd><dt><span class="term">ntforms.tdb*</span></dt><dd><p>installed printer forms</p></dd><dt><span class="term">ntprinters.tdb*</span></dt><dd><p>installed printer information</p></dd><dt><span class="term">printing/</span></dt><dd><p>directory containing tdb per print queue of cached lpq output</p></dd><dt><span class="term">registry.tdb</span></dt><dd><p>Windows registry skeleton (connect via regedit.exe)</p></dd><dt><span class="term">sessionid.tdb</span></dt><dd><p>session information (e.g. support for 'utmp = yes')</p></dd><dt><span class="term">share_info.tdb*</span></dt><dd><p>share acls</p></dd><dt><span class="term">winbindd_cache.tdb</span></dt><dd><p>winbindd's cache of user lists, etc...</p></dd><dt><span class="term">winbindd_idmap.tdb*</span></dt><dd><p>winbindd's local idmap db</p></dd><dt><span class="term">wins.dat*</span></dt><dd><p>wins database when 'wins support = yes'</p></dd></dl></div></div><div class="refsect1" title="SIGNALS"><a name="id307661"></a><h2>SIGNALS</h2><p>Sending the <code class="literal">smbd</code> a SIGHUP will cause it to
- reload its <code class="filename">smb.conf</code> configuration
- file within a short period of time.</p><p>To shut down a user's <code class="literal">smbd</code> process it is recommended
- that <code class="literal">SIGKILL (-9)</code> <span class="emphasis"><em>NOT</em></span>
- 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 <code class="literal">smbd</code> is to send it a SIGTERM (-15) signal and wait for
- it to die on its own.</p><p>The debug log level of <code class="literal">smbd</code> may be raised
- or lowered using <a class="citerefentry" href="smbcontrol.1.html"><span class="citerefentry"><span class="refentrytitle">smbcontrol</span>(1)</span></a> 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.</p><p>Note that as the signal handlers send a debug write,
- they are not re-entrant in <code class="literal">smbd</code>. This you should wait until
- <code class="literal">smbd</code> 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.</p></div><div class="refsect1" title="SEE ALSO"><a name="id307739"></a><h2>SEE ALSO</h2><p><a class="citerefentry" href="hosts_access.5.html"><span class="citerefentry"><span class="refentrytitle">hosts_access</span>(5)</span></a>, <a class="citerefentry" href="inetd.8.html"><span class="citerefentry"><span class="refentrytitle">inetd</span>(8)</span></a>, <a class="citerefentry" href="nmbd.8.html"><span class="citerefentry"><span class="refentrytitle">nmbd</span>(8)</span></a>, <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a>, <a class="citerefentry" href="smbclient.1.html"><span class="citerefentry"><span class="refentrytitle">smbclient</span>(1)</span></a>, <a class="citerefentry" href="testparm.1.html"><span class="citerefentry"><span class="refentrytitle">testparm</span>(1)</span></a>, <a class="citerefentry" href="testprns.1.html"><span class="citerefentry"><span class="refentrytitle">testprns</span>(1)</span></a>, and the
- Internet RFC's <code class="filename">rfc1001.txt</code>, <code class="filename">rfc1002.txt</code>.
- In addition the CIFS (formerly SMB) specification is available
- as a link from the Web page <a class="ulink" href="http://samba.org/cifs/" target="_top">
- http://samba.org/cifs/</a>.</p></div><div class="refsect1" title="AUTHOR"><a name="id307818"></a><h2>AUTHOR</h2><p>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.</p><p>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 <a class="ulink" href="ftp://ftp.icce.rug.nl/pub/unix/" target="_top">
- ftp://ftp.icce.rug.nl/pub/unix/</a>) 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.</p></div></div></body></html>