Provided by: clamav-daemon_0.97.3+dfsg-2.1ubuntu1_amd64 bug


       clamd - an anti-virus daemon


       clamd [options]


       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


       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".

              Print program and database versions.

       RELOAD Reload the virus databases.

              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).

              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.

              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

              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.

              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.


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


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


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

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

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


       Clamd recognizes the following signals:

       SIGHUP Reopen the logfile.

              Reload the signature databases.

              Perform a clean exit.




       Please check the full documentation for credits.


       Tomasz Kojm <>


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