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       pkspxy - The PKS proxy server


       pkspxy [-d] [-o] [-c] [-F config-file]


       The  PKS  proxy  server  is  a  caching  proxy server which can be used
       together with PGP key servers such as pks.

       The server listens to a certain port on the local  system  (by  default
       port 11372, as opposed to port 11371 which is used by pks).  It expects
       HTTP queries for URIs of the following form:


       The x-time parameter is optional; its value is a time stamp in standard
       Unix  time  format  (see  time(2)) in decimal representation.  If it is
       given, the server will only transfer data when  it  was  gathered  more
       recently  than the timestamp given.  When there is no data to transfer,
       the server will use a 204 HTTP return code.

       The proxy server operates in two different modi.  By default, it starts
       up  in  online  mode.  In this mode, the server will immediately try to
       gather data if it considers  this  necessary.   In  offline  mode,  the
       server  will  exclusively  rely on the material contained in its cache,
       and add requests to a queue of postponed queries.  Data  gathering  for
       postponed  requests  is tried after configurable intervals of time when
       in online mode.

       Data gathering happens as follows: The proxy first checks whether there
       are  already  data  for the query in question.  If this is the case, it
       further checks if these data are older than a  configurable  amount  of
       time.  If this is the case, it will ask the key servers which are known
       to it.  This process will stop with the first key server which responds
       with actual key material.

       Switching between modes can be done at run-time: When pkspxy receives a
       SIGUSR1 signal, it will switch to online mode and  immediately  process
       the  postponed queue.  When it receives SIGUSR2, the server switches to
       offline mode.

       Upon receiving a SIGTERM, SIGINT or SIGQUIT signal, the proxy will dump
       the  postponed  queue  to  a  file in the spool area and exit. The file
       generated this way is automatically read when the server gets up.


       -d     Enable debug mode.  This option may occur several times;  expect
              more  changes to behaviour the more often you use it.  When this
              option is given, pkspxy will not detach itself from the  current

       -o     Start up in offline mode.

       -c     Create  the  spool area.  When this option is given, pkspxy will
              create the directories it requires for proper operation.

       -F config-file
              Read config-file.  This parameter must be present at least once.
              See  pkspxy.conf(5)  for  more  information on the configuration


              This directory is the spool area’s default location.  Note  that
              each  file in the spool area represents a response for a certain
              query.  You may use standard Unix tools to expire old data files
              from  the  spool; pkspxy is supposed to smoothly deal with files
              in the spool area disappearing under its feet.

              This file  is  by  default  used  for  the  persistent  list  of
              postponed  queries.   It’s  a  simple  text file, with one query
              string per line.


       pkspxyc(1), pkspxy.conf(5), pks-intro(8), pks(8),  time(2),  signal(7),
       find(1), rm(1)


       Thomas Roessler <>