第二章 C语言实例 —制作http服务器
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.gzcd libevent-2.0.12-stable/./configure --prefix=/usr/local/libevent-2.0.12-stable/makemake installcd ../
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)
$ curl http://127.0.0.1:2345
此时再看服务端,变成如下状态
$ ./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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