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## org.apache.catalina.servlets
Class CGIServlet.CGIRunner

    java.lang.Object
      |
      +--org.apache.catalina.servlets.CGIServlet.CGIRunner

Enclosing class:
  CGIServlet

protected class CGIServlet.CGIRunner
extends java.lang.Object

Encapsulates the knowledge of how to run a CGI script, given the script's desired environment and (optionally) input/output streams

Exposes a `run` method used to actually invoke the CGI.

The CGI environment and settings are derived from the information passed to the constuctor.

The input and output streams can be set by the `setInput` and `setResponse` methods, respectively.

Version:
  $Revision: 1.6 $, $Date: 2001/08/20 02:42:11 $
Author:
  Martin Dengler [root@martindengler.com]

Constructor Summary
`protected` | `CGIServlet.CGIRunner(java.lang.String command, java.util.Hashtable env, java.io.File wd, java.util.Hashtable params)` Creates a CGIRunner and initializes its environment, working directory, and query parameters.

Method Summary
`protected java.lang.String` | `getPostInput(java.util.Hashtable params)` Gets a string for input to a POST cgi script
`protected java.lang.String[]` | `hashToStringArray(java.util.Hashtable h)` Converts a Hashtable to a String array by converting each key/value pair in the Hashtable to a String in the form "key=value" (hashkey + "=" + hash.get(hashkey).toString())
`protected boolean` | `isReady()` Gets ready status
`protected void` | `run()` Executes a CGI script with the desired environment, current working directory, and input/output streams
`protected void` | `setInput(java.io.InputStream stdin)` Sets standard input to be passed on to the invoked cgi script
`protected void` | `setResponse(javax.servlet.http.HttpServletResponse response)` Sets HttpServletResponse object used to set headers and send output to
`protected void` | `updateReadyStatus()` Checks & sets ready status

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CGIServlet.CGIRunner

    protected CGIServlet.CGIRunner(java.lang.String command,
                                   java.util.Hashtable env,
                                   java.io.File wd,
                                   java.util.Hashtable params)

  Creates a CGIRunner and initializes its environment, working directory, and query parameters.
  Input/output streams (optional) are set using the `setInput` and `setResponse` methods, respectively.
  Parameters:
    `command` - string full path to command to be executed
    `env` - Hashtable with the desired script environment
    `wd` - File with the script's desired working directory
    `params` - Hashtable with the script's query parameters
    `res` - HttpServletResponse object for setting headers based on CGI script output

Method Detail

### updateReadyStatus

    protected void updateReadyStatus()

  Checks & sets ready status

### isReady

    protected boolean isReady()

  Gets ready status
  Returns:
    false if not ready (`run` will throw an exception), true if ready

### setResponse

    protected void setResponse(javax.servlet.http.HttpServletResponse response)

  Sets HttpServletResponse object used to set headers and send output to
  Parameters:
    `response` - HttpServletResponse to be used

### setInput

    protected void setInput(java.io.InputStream stdin)

  Sets standard input to be passed on to the invoked cgi script
  Parameters:
    `stdin` - InputStream to be used

### hashToStringArray

    protected java.lang.String[] hashToStringArray(java.util.Hashtable h)
                                            throws java.lang.NullPointerException

  Converts a Hashtable to a String array by converting each key/value pair in the Hashtable to a String in the form "key=value" (hashkey + "=" + hash.get(hashkey).toString())
  Parameters:
    `h` - Hashtable to convert
  Returns:
    converted string array
  Throws:
    `java.lang.NullPointerException` - if a hash key has a null value

### run

    protected void run()
                throws java.io.IOException

  Executes a CGI script with the desired environment, current working directory, and input/output streams

  This implements the following CGI specification recommedations:

  - Servers SHOULD provide the "`query`" component of the script-URI as command-line arguments to scripts if it does not contain any unencoded "=" characters and the command-line arguments can be generated in an unambiguous manner.
  - Servers SHOULD set the AUTH_TYPE metavariable to the value of the "`auth-scheme`" token of the "`Authorization`" if it was supplied as part of the request header. See `getCGIEnvironment` method.
  - Where applicable, servers SHOULD set the current working directory to the directory in which the script is located before invoking it.
  - Server implementations SHOULD define their behavior for the following cases:
    - Allowed characters in pathInfo: This implementation does not allow ASCII NUL nor any character which cannot be URL-encoded according to internet standards;
    - Allowed characters in path segments: This implementation does not allow non-terminal NULL segments in the the path -- IOExceptions may be thrown;
    - "`.`" and "`..`" path segments: This implementation does not allow "`.`" and "`..`" in the the path, and such characters will result in an IOException being thrown;
    - Implementation limitations: This implementation does not impose any limitations except as documented above. This implementation may be limited by the servlet container used to house this implementation. In particular, all the primary CGI variable values are derived either directly or indirectly from the container's implementation of the Servlet API methods.
  Throws:
    `java.io.IOException` - if problems during reading/writing occur
  See Also:
    `java.lang.Runtime#exec(String command, String[] envp, File dir)`

### getPostInput

    protected java.lang.String getPostInput(java.util.Hashtable params)

  Gets a string for input to a POST cgi script
  Parameters:
    `params` - Hashtable of query parameters to be passed to the CGI script
  Returns:
    for use as input to the CGI script

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