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Manual Reference Pages  -  YAZPROXY (8)

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yazproxy - The YAZ toolkits transparent Z39.50/SRU proxy



yazproxy [-a filename] [-c config] [-D] [-i seconds] [-l filename] [-m num] [-n num] [-o level] [-t target] [-p pidfile] [-T seconds] [-u userid] [-v level] [-V] [-X] {host:port}


yazproxy is a proxy that accepts connections from Z39.50/SRU clients and contacts a Z39.50 backend. The listening port must be specified on the command-line. inetd operation is not supported. The host:port argument specifies host address to listen to, and the port to listen on. Use the host @ to listen for connections coming from any address.

yazproxy can be configured using command-line options or a configuration file. Configuration file options override values specified on the command-line.

yazproxy rereads its configuration file and reopens log files when it receives the hangup signal, SIGHUP.


-a filename

Specifies the name of a file to which to write a log of the APDUs (protocol packets) that pass through the proxy. The special filename - may be used to indicate standard output.

-c config

Specifies config filename. Configuration is in XML and is only supported if the YAZ proxy is compiled with libxml2.


Puts YAZ proxy in the background after startup. This is similar to using shells & operator but often better since it allows the start / stop script to capture startup errors.

-i seconds

Specifies in seconds the idle time for communication between client and proxy. If a connection is inactive for this long it will be closed. Default: 600 seconds (10 minutes).

-l filename

Specifies the name of a file to which to write a log of the YAZ proxy activity. This uses the logging facility as provided by the YAZ toolkit. If this options is omitted, the output directed to stderr.

-m num

Specifies the maximum number of client connections to be offered [default 150].

-n num

Sets maximum number of open files to num. This is only available on systems that offers the setrlimit(2) call.

-o level

Sets level for optimization. Use zero to disable; non-zero to enable. Handling for this is not fully implemented; we will probably use a bit mask to enable/disable specific features. By default optimization is enabled (value 1).

-p pidfile

When specified, yazproxy will create pidfile with the process ID of the proxy. The pidfile will be generated before the process changes identity (see option -u).

-t target

Specifies the default backend target to use when a client connects that does not explicitly specify a target in its initRequest.

-T seconds

Specifies in seconds the idle time for communication between proxy and backend target. If a connection is inactive for this long it will be closed. Default: 600 seconds (10 minutes).

-u userid

When specified, yazproxy will change identity to the user ID specified, just after the proxy has started listening to a possibly privileged port and after the PID file has been created if specified by option -u.

-v level

Sets the logging level. level is a comma-separated list of members of the set {fatal,debug,warn,log,malloc,all,none}.


Displays yazproxy version and exits with status code 0. Should not be used in conjunction with other options.


Enables debugging mode for the proxy. When specified, the proxy will not fork itself, thus any violations becomes fatal. Useful if you run yazproxy inside gdb. Dont run this in production.


The following command starts the proxy, listening on port 9000, with its default backend target set to Index Datas test server:

  $ yazproxy -t @:9000

You can connect to the proxy via yaz-client as follows:

  $ ./yaz-client  localhost:9000/gils
  Sent initrequest.
  Connection accepted by v3 target.
  ID     : 81
  Name   : Zebra Information Server/GFS/YAZ (YAZ Proxy)
  Version: Zebra 1.3.15/1.23/2.0.19
  Options: search present delSet scan sort extendedServices namedResultSets
  Elapsed: 0.152108
  Z> f computer
  Sent searchRequest.
  Received SearchResponse.
  Search was a success.
  Number of hits: 3, setno 1
  SearchResult-1: computer(3)
  records returned: 0
  Elapsed: 0.172533

The YAZ command-line client, yaz-client, allows you to set the proxy address by specifying option -p. In that case, the actual backend target is specified as part of the Initialize Request.

Suppose the proxy running on localhost, port 9000. To connect to British Librarys server at use:

   yaz-client -p localhost:9000


yaz(7) yaz-client(1)

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yazproxy YAZPROXY (8) 10/16/2013

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