cgi中的环境变量

最新推荐文章于 2025-06-04 16:10:41 发布

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本文介绍了一个使用C语言编写的简单CGI程序，该程序展示了多种CGI环境变量及其值，包括HTTP请求头、服务器配置及客户端信息等，有助于理解CGI的工作原理。

cgi中参数都是通过环境变量传递的，那么有哪些环境变量呢？直接上代码吧。

#include <stdio.h>
#include <stdlib.h>
int main()
{
	char *env_var[] = {
		"COMSPEC", 
		"CONTENT_LENGTH",
		"CONTENT_TYPE",
		"CONTENT_FILE",
		"PATH_INFO",
		"PATH_TRANSLATED",
		"DOCUMENT_ROOT",
		"GATEWAY_INTERFACE",
		"HTTP_ACCEPT",
		"HTTP_ACCEPT_ENCODING",
		"HTTP_ACCEPT_LANGUAGE",
		"HTTP_CONNECTION",
		"HTTP_HOST",
		"HTTP_USER_AGENT",
		"PATH",
		"QUERY_STRING", 
		"REMOTE_ADDR",
		"REMOTE_PORT",
		"REQUEST_METHOD",
		"REQUEST_URI",
		"SCRIPT_FILENAME",
		"SCRIPT_NAME",
		"SERVER_ADDR",
		"SERVER_ADMIN",
		"SERVER_NAME",
		"SERVER_PORT",
		"SERVER_PROTOCOL",
		"SERVER_SIGNATURE",
		"SERVER_SOFTWARE",
	};

	printf("Content-Type: text/html\n\n");
	printf("<html>");
	printf("<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>");
	printf("<body>");
	printf("<table>");
	for (int i = 0; i < sizeof env_var / sizeof env_var[0]; ++i)
	{
		printf("<tr>");
		printf("<td>%s</td>", env_var[i]);
		char *data = getenv(env_var[i]);
		if (NULL == data) data = "";
		printf("<td>%s</td>", data);
		printf("</tr>");
	}
	printf("</table");
	printf("</body>");
	printf("</html>");
}

最后结果

COMSPEC	C:\WINDOWS\system32\cmd.exe
CONTENT_LENGTH	44
CONTENT_TYPE	multipart/form-data; boundary=----WebKitFormBoundarytt3Tg7IONIUdZmGU
CONTENT_FILE
PATH_INFO
PATH_TRANSLATED
DOCUMENT_ROOT	D:/SoftWare/Apache2.2/htdocs
GATEWAY_INTERFACE	CGI/1.1
HTTP_ACCEPT	text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8
HTTP_ACCEPT_ENCODING	gzip, deflate
HTTP_ACCEPT_LANGUAGE	zh-CN,zh;q=0.8,en;q=0.6
HTTP_CONNECTION	keep-alive
HTTP_HOST	127.0.0.1
HTTP_USER_AGENT	Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36
PATH	D:\SoftWare\Python34\;D:\SoftWare\Python34\Scripts;D:\SoftWare\Python34;D:\SoftWare\Python34\Scripts;D:\SoftWare\Vim\vim74;D:\SoftWare\Cygwin\CygwinPortable\App\Cygwin\bin;D:\SoftWare\Dev-Cpp\MinGW64\bin;D:\SoftWare\Java\jdk\bin;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;
QUERY_STRING
REMOTE_ADDR	127.0.0.1
REMOTE_PORT	12793
REQUEST_METHOD	POST
REQUEST_URI	/cgi-bin/upload.cgi
SCRIPT_FILENAME	D:/SoftWare/Apache2.2/cgi-bin/upload.cgi
SCRIPT_NAME	/cgi-bin/upload.cgi
SERVER_ADDR	127.0.0.1
SERVER_ADMIN	baidu@qq.com
SERVER_NAME	127.0.0.1
SERVER_PORT	80
SERVER_PROTOCOL	HTTP/1.1
SERVER_SIGNATURE
SERVER_SOFTWARE	Apache/2.2.25 (Win32)