c语言编写cgi（第二章 C语言实例 —制作http服务器 dennis ITeye技术网站）

任务:

1.制作http服务器    
    
    
，读取url提交的相关数据.

2.把读到的数据推入到队列中.

条件:

使用libevent的类库,所以先安装libevent

tar zxvf libevent-2.0.12-stable.tar.gz cd libevent-2.0.12-stable/ ./configure --prefix=/usr/local/libevent-2.0.12-stable/ make make install cd ../

1.服务端简易代码如下

#include <stdio.h> #include <stdlib.h> #include <err.h> #include <event.h> #include <evhttp.h> void http_handle(struct evhttp_request *req, void *arg); /* HTTP Request Handle */ int main(){ struct evhttp *httpd; event_init(); httpd = evhttp_start("0.0.0.0", 2345); if (httpd == NULL) { fprintf(stderr, "Error: Unable to listen on %s:%d\n\n"); exit(1); } evhttp_set_timeout(httpd, 2000); evhttp_set_gencb(httpd, http_handle, NULL); event_dispatch(); evhttp_free(httpd); return 0; } void http_handle(struct evhttp_request *req, void *arg){ struct evbuffer *buf; buf = evbuffer_new(); /* Response the client */ evhttp_send_reply(req, HTTP_OK, "OK", buf); //evbuffer_add_printf(buf, "%s", "HTTPSQS_AUTH_FAILED"); /* Release the memory */ evbuffer_free(buf); fprintf(stderr,"Send \n"); }

编译：(编译时把libevent的类库中的.so文件和.h文件连接 进来)

gcc http.c -L/usr/local/libevent-2.0.12-stable/lib/ -levent -I/usr/local/libevent-2.0.12-stable/include/

测试

在服务器端  


     


     


   ，执行编译后的文件a.out

./a.out

客户端进行访问(也可以使用浏览器访问


 




 




 

，但是要打开端口号2345——vi /etc/sysconfig/iptables)

[www@zhoubc data]$ curl http://127.0.0.1:2345

此时再看服务端,变成如下状态

[www@zhoubc queue]$ ./a.out Send

2.处理http请求,重写htt_handle方法

void http_handle(struct evhttp_request *req, void *arg){ struct evbuffer *buf; buf = evbuffer_new(); /* Analyst the URI */ char *decode_uri = strdup((char*) evhttp_request_uri(req)); struct evkeyvalq http_query; evhttp_parse_query(decode_uri, &http_query); free(decode_uri); /* URI Parameter */ const char *http_input_opt = evhttp_find_header (&http_query, "opt"); /* Operation Type */ const char *http_input_name = evhttp_find_header (&http_query, "name"); /* Queue Name */ const char *http_input_data = evhttp_find_header (&http_query, "data"); /* Data With GET */ /* header */ evhttp_add_header(req->output_headers, "Content-Type", "text/plain"); evhttp_add_header(req->output_headers, "Connection", "keep-alive"); evhttp_add_header(req->output_headers, "Cache-Control", "no-cache"); evhttp_add_header(req->output_headers, "author", "Dennis .Z Ritchie"); if(http_input_opt != NULL && http_input_name != NULL && strlen(http_input_name) < 300){ /* GET Method,OUT The Queue */ if(strcmp(http_input_opt,"put") == 0){ int buffer_data_len = EVBUFFER_LENGTH(req->input_buffer); if(buffer_data_len > 0){ /* POST METHOD */ char *input_value_data = EVBUFFER_DATA(req->input_buffer); /* Submited Data */ fprintf(stderr,"%s \n",input_value_data); }else if(http_input_data != NULL){ fprintf(stderr,"%s \n",http_input_data); } }else if(strcmp(http_input_opt,"get") == 0){ } } /* Response the client */ evhttp_send_reply(req, HTTP_OK, "OK", buf); //evbuffer_add_printf(buf, "%s", "HTTPSQS_AUTH_FAILED"); /* Release the memory */ evhttp_clear_headers(&http_query); evbuffer_free(buf); }

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