使用lighttpd fcgi C语言设计符合restful api风格的配置

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本文详细介绍了使用C语言编写的FastCGI程序，包括如何处理GET和POST请求，解析请求数据，以及如何在Ubuntu环境下编译和测试该程序。通过具体代码示例，读者可以深入理解FastCGI的工作原理。

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一、fcgi程序编写

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

char* getcgidata(FILE* fp, char* requestmethod)
{
   char* input = NULL;
   int len;
   int size = 1024;
   int i = 0;

   if (!strcmp(requestmethod, "GET"))
   {
       return NULL;
   }
   else if (!strcmp(requestmethod, "POST"))
   {
       len = atoi(getenv("CONTENT_LENGTH"));
       input = (char*)malloc(sizeof(char)*(size + 1));
       if (len == 0)
       {
           input[0] = '\0';
           return input;
       }

       while(1)
       {
           input[i] = (char)fgetc(fp);
           if (i == size)
           {
               input[i+1] = '\0';
               return input;
           }

           --len;
           if (feof(fp) || (!(len)))
           {
               i++;
               input[i] = '\0';
               return input;
           }
           i++;
       }
   }
   return NULL;
}
int main(){
   int count = 0;
   char *request_method = NULL;
char *fcgidata = NULL;

while(FCGI_Accept() >= 0){
 request_method = getenv("REQUEST_METHOD");
 fcgidata = getcgidata(stdin,request_method);
 if(NULL != fcgidata)
{
 printf("Content-type: text/html\r\n"
 "\r\n"
 "<title>FastCGI Hello! (C, fcgi_stdio library)</title>"
 "<h1>FastCGI Hello! (C, fcgi_stdio library)</h1>"
 "Request number %d running on host %s "
 "request_method:%s "
 "content_length:%s "
 "query_string:%s "
 "usr_agent:%s "
 "script_name:%s "
 "fcgidata:%s ",
 ++count, getenv("SERVER_NAME"),getenv("REQUEST_METHOD"),\
 getenv("CONTENT_LENGTH"),getenv("QUERY_STRING"),\
 getenv("HTTP_USER_AGENT"),getenv("SCRIPT_NAME"),fcgidata);
 if(NULL != fcgidata)
free(fcgidata);
 }
 else
 {
 printf("Content-type: text/html\r\n"
"\r\n"
"<title>FastCGI Hello! (C, fcgi_stdio library)</title>"
"<h1>FastCGI Hello! (C, fcgi_stdio library)</h1>"
"Request number %d running on host %s "
"request_method:%s "
"content_length:%s "
"query_string fcgidata:%s "
"usr_agent:%s "
"script_name:%s ",
++count, getenv("SERVER_NAME"),getenv("REQUEST_METHOD"),\
getenv("CONTENT_LENGTH"),getenv("QUERY_STRING"),\
getenv("HTTP_USER_AGENT"),getenv("SCRIPT_NAME"));
 }
 }
}