linux c cgi获得各种环境变量 大全

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

int main(void)
{
    char *s = NULL;
    s=getenv("REMOTE_ADDR");

    printf("Content-type: text/plain;\n\n");
   
    if(s!=NULL)
     printf("ip: %s\n",s); 

    else
     printf("%s\n", "s is null");
 
   return 0;
}

 

这个是获得客户端ip的,通过getenv这个函数还可以获得以下一些东东

   "REMOTE_ADDR",
                "DOCUMENT_ROOT",
                "GATEWAY_INTERFACE",
                "SERVER_SOFTWARE",
                "SERVER_NAME",
                "SERVER_PROTOCOL",
                "SERVER_PORT",
                "SERVER_ADMIN",
                "SERVER_SIGNATURE",
                "REQUEST_METHOD",
                "REQUEST_URI",
                "PATH_INFO",
                "PATH_TRANSLATED",
                "SCRIPT_NAME",
                "SCRIPT_FILENAME",
                "QUERY_STRING",
                "REMOTE_HOST",
                "REMOTE_ADDR",
                "REMOTE_USER",
                "REMOTE_IDENT",
                "CONTENT_TYPE",
                "CONTENT_LENGTH",
                "HTTP_ACCEPT",
                "HTTP_ACCEPT_CHARSET",
                "HTTP_ACCEPT_LANGUAGE",
                "HTTP_ENCODING",
                "HTTP_USER_AGENT",
                "HTTP_CONNECTION",
                "HTTP_HOST",
                "HTTP_REFERER",
                "AUTH_TYPE"