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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 V1.60.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"><a name="smbd.8"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2>Name</h2><p>smbd &#8212; server to provide SMB/CIFS services to clients</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><tt class="command">smbd</tt> [-D] [-F] [-S] [-i] [-h] [-V] [-b] [-d &lt;debug level&gt;] [-l &lt;log directory&gt;] [-p &lt;port number&gt;] [-O &lt;socket option&gt;] [-s &lt;configuration file&gt;]</p></div></div><div class="refsect1" lang="en"><h2>DESCRIPTION</h2><p>This program is part of the <a href="Samba.7.html"><span class="citerefentry"><span class="refentrytitle">Samba</span>(7)</span></a> suite.</p><p><b class="command">smbd</b> 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 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 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 <b class="command">smbd</b> killed and restarted.</p></div><div class="refsect1" lang="en"><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 <b class="command">smbd</b> for
- servers that provide more than casual use file and
- print services. This switch is assumed if <b class="command">smbd
- </b> 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 <b class="command">smbd</b> 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
- <b class="command">smbd</b> under process supervisors such
- as <b class="command">supervise</b> and <b class="command">svscan</b>
- from Daniel J. Bernstein's <b class="command">daemontools</b>
- package, or the AIX process monitor.
- </p></dd><dt><span class="term">-S</span></dt><dd><p>If specified, this parameter causes
- <b class="command">smbd</b> 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 deamon mode when run from the
- command line. <b class="command">smbd</b> also logs to standard
- output, as if the <b class="command">-S</b> parameter had been
- given.
- </p></dd><dt><span class="term">-V</span></dt><dd><p>Prints the program version number.
-</p></dd><dt><span class="term">-s &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 <tt class="filename">smb.conf</tt> for more information.
-The default configuration file name is determined at
-compile time.</p></dd><dt><span class="term">-d|--debug=debuglevel</span></dt><dd><p><i class="replaceable"><tt>debuglevel</tt></i> is an integer
-from 0 to 10. The default value if this parameter is
-not specified is zero.</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="indexterm" name="id2802583"></a><i class="parameter"><tt>log level</tt></i> parameter
-in the <tt class="filename">smb.conf</tt> file.</p></dd><dt><span class="term">-l|--logfile=logbasename</span></dt><dd><p>File name for log/debug files. The extension
-<tt class="constant">".client"</tt> will be appended. 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">-l &lt;log directory&gt;</span></dt><dd><p>If specified,
- <i class="replaceable"><tt>log directory</tt></i>
- 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
- <a class="indexterm" name="id2802678"></a><i class="parameter"><tt>max log size</tt></i>
- option in the <a href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> file. <span class="emphasis"><em>Beware:</em></span>
- If the directory specified does not exist, <b class="command">smbd</b>
- will log to the default debug log location defined at compile time.
- </p><p>The default log directory is specified at
- compile time.</p></dd><dt><span class="term">-p &lt;port number&gt;</span></dt><dd><p><i class="replaceable"><tt>port number</tt></i> is a positive integer
- value. The default value if this parameter is not
- specified is 139.</p><p>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.</p><p>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.</p><p>This parameter is not normally specified except
- in the above situation.</p></dd></dl></div></div><div class="refsect1" lang="en"><h2>FILES</h2><div class="variablelist"><dl><dt><span class="term"><tt class="filename">/etc/inetd.conf</tt></span></dt><dd><p>If the server is to be run by the
- <b class="command">inetd</b> meta-daemon, this file
- must contain suitable startup information for the
- meta-daemon.
- </p></dd><dt><span class="term"><tt class="filename">/etc/rc</tt></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"><tt class="filename">/etc/services</tt></span></dt><dd><p>If running the server via the
- meta-daemon <b class="command">inetd</b>, 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"><tt class="filename">/usr/local/samba/lib/smb.conf</tt></span></dt><dd><p>This is the default location of the <a 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 <tt class="filename">/usr/samba/lib/smb.conf</tt>
- and <tt class="filename">/etc/samba/smb.conf</tt>.</p><p>This file describes all the services the server
- is to make available to clients. See <a 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" lang="en"><h2>LIMITATIONS</h2><p>On some systems <b class="command">smbd</b> 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" lang="en"><h2>ENVIRONMENT VARIABLES</h2><div class="variablelist"><dl><dt><span class="term"><tt class="envar">PRINTER</tt></span></dt><dd><p>If no printer name is specified to
- printable services, most systems will use the value of
- this variable (or <tt class="constant">lp</tt> 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" lang="en"><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="indexterm" name="id2799315"></a><i class="parameter"><tt>obey pam restrictions</tt></i> <a href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> paramater. When this is set, the following restrictions apply:
- </p><div class="itemizedlist"><ul type="disc"><li><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 vaild, not disabled and is permitted to
- login at this time. This also applies to encrypted logins.
- </p></li><li><p><span class="emphasis"><em>Session Management</em></span>: 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.
- </p></li></ul></div></div><div class="refsect1" lang="en"><h2>VERSION</h2><p>This man page is correct for version 3.0 of
- the Samba suite.</p></div><div class="refsect1" lang="en"><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" lang="en"><h2>SIGNALS</h2><p>Sending the <b class="command">smbd</b> a SIGHUP will cause it to
- reload its <tt class="filename">smb.conf</tt> configuration
- file within a short period of time.</p><p>To shut down a user's <b class="command">smbd</b> process it is recommended
- that <b class="command">SIGKILL (-9)</b> <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 <b class="command">smbd</b> is to send it a SIGTERM (-15) signal and wait for
- it to die on its own.</p><p>The debug log level of <b class="command">smbd</b> may be raised
- or lowered using <a 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 <b class="command">smbd</b>. This you should wait until
- <b class="command">smbd</b> 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" lang="en"><h2>SEE ALSO</h2><p><a href="hosts_access.5.html"><span class="citerefentry"><span class="refentrytitle">hosts_access</span>(5)</span></a>, <a href="inetd.8.html"><span class="citerefentry"><span class="refentrytitle">inetd</span>(8)</span></a>, <a href="nmbd.8.html"><span class="citerefentry"><span class="refentrytitle">nmbd</span>(8)</span></a>, <a href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a>, <a href="smbclient.1.html"><span class="citerefentry"><span class="refentrytitle">smbclient</span>(1)</span></a>, <a href="testparm.1.html"><span class="citerefentry"><span class="refentrytitle">testparm</span>(1)</span></a>, <a href="testprns.1.html"><span class="citerefentry"><span class="refentrytitle">testprns</span>(1)</span></a>, and the
- Internet RFC's <tt class="filename">rfc1001.txt</tt>, <tt class="filename">rfc1002.txt</tt>.
- In addition the CIFS (formerly SMB) specification is available
- as a link from the Web page <ulink url="http://samba.org/cifs/">
- http://samba.org/cifs/</ulink>.</p></div><div class="refsect1" lang="en"><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 <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.</p></div></div></body></html>