Clam Daemon(8)							  Clam AntiVirus						    Clam Daemon(8)

NAME

       clamd - an anti-virus daemon

SYNOPSIS

       clamd [options]

DESCRIPTION

       The  daemon listens for incoming connections on Unix and/or TCP socket and scans files or directories on demand. It reads the configuration
       from /etc/clamav/clamd.conf

COMMANDS

       It's recommended to prefix clamd commands with the letter z (eg. zSCAN) to indicate that the command will be delimited by a NULL  character
       and  that  clamd  should continue reading command data until a NULL character is read. The null delimiter assures that the complete command
       and its entire argument will be processed as a single command. Alternatively commands may be prefixed with the letter n (e.g. nSCAN) to use
       a  newline character as the delimiter. Clamd replies will honour the requested terminator in turn.  If clamd doesn't recognize the command,
       or the command doesn't follow the requirements specified below, it will reply with an error message, and close the connection.

       Clamd recognizes the following commands:

       PING   Check the server's state. It should reply with "PONG".

       VERSION
	      Print program and database versions.

       RELOAD Reload the virus databases.

       SHUTDOWN
	      Perform a clean exit.

       SCAN file/directory
	      Scan a file or a directory (recursively) with archive support enabled (if not disabled in clamd.conf). A full path is required.

       CONTSCAN file/directory
	      Scan file or directory (recursively) with archive support enabled and don't stop the scanning when a virus is found.

       MULTISCAN file/directory
	      Scan file in a standard way or scan directory (recursively) using multiple threads (to make the scanning faster on SMP machines).

       ALLMATCHSCAN file/directory
	      ALLMATCHSCAN works just like SCAN except that it sets a mode where scanning continues after finding a match within a file.

       INSTREAM
	      It is mandatory to prefix this command with n or z.

	      Scan a stream of data. The stream is sent to clamd in chunks, after INSTREAM, on the same socket on  which  the  command	was  sent.
	      This  avoids  the  overhead  of establishing new TCP connections and problems with NAT. The format of the chunk is: '<length><data>'
	      where <length> is the size of the following data in bytes expressed as a 4 byte unsigned integer in network byte order and <data> is
	      the  actual  chunk.  Streaming  is  terminated  by  sending  a  zero-length chunk. Note: do not exceed StreamMaxLength as defined in
	      clamd.conf, otherwise clamd will reply with INSTREAM size limit exceeded and close the connection.

       FILDES It is mandatory to newline terminate this command, or prefix with n or z.

	      This command only works on UNIX domain sockets.  Scan a file descriptor. After issuing a FILDES command a subsequent  rfc2292/bsd4.4
	      style  packet  (with  at least one dummy character) is sent to clamd carrying the file descriptor to be scanned inside the ancillary
	      data.  Alternatively the file descriptor may be sent in the same packet, including the extra character.

       STATS  IIt is mandatory to newline terminate this command, or prefix with n or z, it is recommended to only use the z prefix.

	      Replies with statistics about the scan queue, contents of scan queue, and memory usage. The exact reply format is subject to  change
	      in future releases.

       IDSESSION, END
	      It is mandatory to prefix this command with n or z, and all commands inside IDSESSION must be prefixed.

	      Start/end  a clamd session. Within a session multiple SCAN, INSTREAM, FILDES, VERSION, STATS commands can be sent on the same socket
	      without opening new connections. Replies from clamd will be in the form '<id>: <response>' where <id>  is  the  request  number  (in
	      ascii,  starting	from 1) and <response> is the usual clamd reply.  The reply lines have same delimiter as the corresponding command
	      had.  Clamd will process the commands asynchronously, and reply as soon as it has finished processing.

	      Clamd requires clients to read all the replies it sent, before sending more commands to prevent send()  deadlocks.  The  recommended
	      way  to  implement a client that uses IDSESSION is with non-blocking sockets, and a select()/poll() loop: whenever send would block,
	      sleep in select/poll until either you can write more data, or read more replies.	Note that using non-blocking sockets  without  the
	      select/poll loop and alternating recv()/send() doesn't comply with clamd's requirements.

	      If  clamd detects that a client has deadlocked,  it will close the connection. Note that clamd may close an IDSESSION connection too
	      if you don't follow the protocol's requirements. The client can use the PING command to keep the connection alive.

       VERSIONCOMMANDS
	      It is mandatory to prefix this command with either n or z.  It is recommended to use nVERSIONCOMMANDS.

	      Print program and database versions, followed by "| COMMANDS:" and a space-delimited list of supported commands.	Clamd  <0.95  will
	      recognize this as the VERSION command, and reply only with their version, without the commands list.

	      This command can be used as an easy way to check for IDSESSION support for example.

       DEPRECATED COMMANDS

       STREAM Scan stream - on this command clamd will return "PORT number" you should connect to and send data to scan. (DEPRECATED, use INSTREAM
	      instead)

       NOT SUPPORTED COMMANDS

       SESSION, END
	      Start/end a clamd session which will allow you to run multiple commands per TCP session. (use IDSESSION instead)

OPTIONS

       -h, --help
	      Output help information and exit.

       -V, --version
	      Print the version number and exit.

       -c FILE, --config-file=FILE
	      Read configuration from FILE.

SIGNALS

       Clamd recognizes the following signals:

       SIGHUP Reopen the logfile.

       SIGUSR2
	      Reload the signature databases.

       SIGTERM
	      Perform a clean exit.

FILES

       /etc/clamav/clamd.conf

CREDITS

       Please check the full documentation for credits.

AUTHOR

       Tomasz Kojm <tkojm@clamav.net>

SEE ALSO

       clamd.conf(5), clamdscan(1), freshclam(1), freshclam.conf(5), clamav-milter(8)

ClamAV 0.98.4							 February 12, 2009						    Clam Daemon(8)