FastCGI 应用程序样例

本节包含使用 PHP、Perl 和 C 编写的 FastCGI 应用程序样例。

• 使用 PHP 编写的响应者应用程序 (ListDir.php)

• 使用 Perl 编写的授权者应用程序 (SimpleAuth.pl)

• 使用 C 编写的过滤器应用程序 (SimpleFilter.c)

使用 PHP 编写的响应者应用程序 (ListDir.php)

<?php
 		$dir = "/tmp/";

		// Open a known directory, and proceed to read its contents
		if (is_dir($dir)) {
			if ($dh = opendir($dir)) {
 				while (($file = readdir($dh)) !== false) {
 					echo "filename: $file : filetype: " . filetype($dir . $file) . "\n";
 				}
				closedir($dh);
			}

		}
?>

以上示例的 obj.conf 代码片段为：

<Object name="default">
		NameTrans fn="assign-name" from="/fcgi/*" name="responder.fcgi"
</Object>
<Object name="responder.fcgi">
		Service fn="responder-fastcgi" app-path="/foo/fastcgi-enabled-php-installation/bin/php" 
			bind-path="localhost:3431"  min-procs=3
</Object>

使用 Perl 编写的授权者应用程序 (SimpleAuth.pl)

#!/usr/bin/perl

use FCGI;

while (FCGI::accept >= 0) {
		if( $ENV{'HTTP_AUTHORIZATION'} ) { 
        # This value can be further decoded to get the actual username and password and then
        # perform some kind of user validation. This program only checks for the presence of
        # of this environment param and is not really bothered about its value

        print( "Status: 200\r\n" );
        print( "\r\n" );

    } else {
       
        print( "Status: 401\r\n" );
        print( "WWW-Authenticate: basic realm=\"foo\"\r\n" );
        print( "\r\n" );  

   }

}
Example obj.conf settings for the above example:

以上示例的 obj.conf 代码片段为：

<Object name="responder.fcgi">
		AuthTrans fn="auth-fastcgi" app-path="/fastcgi/apps/auth/SimpleAuth.pl" 
		bind-path="localhost:3432"
		Service fn="responder-fastcgi" app-path="/foo/fastcgi-enabled-php-installation/bin/php" 
		bind-path="localhost:3433" app-env="PHP_FCGI_CHILDREN=8" min-procs=1
</Object>

第一次请求 http://localhost/fcgi/php/ListDir.php 时，浏览器将显示验证对话框。在用户输入用户名和密码后，将列出 "/tmp" 目录的内容。

使用 C 编写的过滤器应用程序 (SimpleFilter.c)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcgi_stdio.h>

		void main(void) {
			size_t PageSize = 1024 * 3;
    		char *page;
    		FCGX_Stream *in, *out, *err;
    		FCGX_ParamArray envp;

		 	int count=0;
    		page = (char *)malloc(PageSize);

		 	if (page == NULL) {

				printf("Content-type: text/x-server-parsed-html\r\n");
				printf("<title>malloc failure</title>");
				printf("<h1>Cannot allocate memory to run filter. exiting</h1>");
				printf("\r\n\r\n");
				exit(2);
			}

			while(FCGI_Accept() >= 0) {

         	char *tmp;
         	char *execcgi;      
         	char *dataLenStr = NULL;
         	int numchars = 0;
         	int stdinDataSize = 0;
         	int filterDataLen = 0;
         	int dataToBeRead = 0;
         	int x = 0;
         	int loopCount = 0;   
				

			  	count++;
         	dataLenStr = getenv("FCGI_DATA_LENGTH");
        
         	if(dataLenStr)
             	filterDataLen = atoi(dataLenStr);
   
				/* clear out stdin */
         	while (EOF != getc(stdin)) {
             	stdinDataSize++;
         	}

				dataToBeRead = filterDataLen;
        	FCGI_StartFilterData();
        	tmp = page; /** just in case fread or fwrite moves our pointer **/


				//start responding
				printf("Content-type: text/plain\r\n");
				printf("\r\n"); /** send a new line at the beginning **/
				printf("<title>SIMPLE FILTER</title>");
				printf(<h1>This page was Filtered by SimpleFilter FastCGI filter</h1>");
				printf("file size=%d<br>", filterDatalen);
				printf("stdin size=%d<br>, stdinDataSize);


				while(dataToBeRead > 0 ) {
           		x = 0;
           		page = tmp;
            
           		if(dataToBeRead > PageSize)
             		 x = PageSize;
           		else
              		 x = dataToBeRead;
					numchars = fread((void *)(page), 1, x, stdin);
				
					if( numchars == 0 )
						continue; 
					/** at this point your data is in page pointer, so do 
					whatever you want 
               with it before sending it back to the server.
					In this example, no data is manipulated. Only the count of number of 
               times the filter data is read and the total bytes read 
					at the end of every 
               loop is printed. **/	

					dataToBeRead -= numchars;
					loopCount++;
					printf("loop count = %d ... so far read %d bytes <br>", loopCount, 
					(filterDatalen - dataToBeRead));
				}
				printf("\r\n\r\n"); /** send a new line at the end of transfer **/

				fflush(stdout);

				page = tmp; /** restore page pointer **/
				memset(page,NULL,numchars);
		}

		free(page);
}

以上示例的 obj.conf 设置示例。

如果该 FastCGI 应用程序是在运行 Web Server 的计算机上运行，则

<Object name=<"filter.fcgi">
						Service fn="filter-fastcgi" app-path="/fastcgi/apps/filter/SimpleFilter.exe" 
             bind-path="localhost:3434" app-env="LD_LIBRARY_PATH=/fastcgi/fcgi-2.4/libfcgi/.libs"
</Object>

如果该应用程序正在远程计算机上运行，则必须在 obj.conf 文件中包含以下代码行：

<Object name="filter.fcgi">
			Service fn="filter-fastcgi" bind-path="<remote-host>:<remote-port>"
</Object>

如果要过滤 Web Server 实例根目录下的 fcgi 目录中大小为 "26868" 字节的 "FilterThisFile" 文件，则对 "http://localhost/fcgi/filter/FilterThisFile" 的请求将生成以下输出：

This page was Filtered by SimpleFilter FastCGI filter