基于 libevent 开源框架实现的 web 服务器

/* 原创文章 转载请附上原链接: https://www.cnblogs.com/jiujue/p/10707153.html   */

自己实现的如有缺漏欢迎提出

直接代码 一切皆在代码中

首先是 主函数文件 和 头文件

　　头文件：　

 #ifndef _HEAD_H_
 #define _HEAD_H_

 #include<stdio.h>
 #include<string.h>
 #include<stdlib.h>
 #include<time.h>
 #include<math.h>
 #include <fcntl.h>
 #include <ctype.h>
 #include <dirent.h>
 #include <unistd.h>
 #include <event2/event.h>
 #include <event2/listener.h>
 #include <event2/bufferevent.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <arpa/inet.h>

 int judge_type_dir_or_nondir(const char* name);
 int send_dir_asheml(struct bufferevent *bufev, char *dirname, void *arg);
 struct evconnlistener* libev_start(struct event_base*base, const char* Ip,int Port);
 int send_html_head(struct bufferevent* bufev, int stat_no, const char* stat_desc, char* type);
 const char *get_file_type(const char *name);
 int send_file(struct bufferevent *bufev,char* file);

 #endif

　　主函数文件：

 // File Name: main.c
 // Author: jiujue
 // Created Time: 2019年04月05日 星期五 19时54分48秒

 #include "head.h"

 int main(int argc, const char* argv[])
 {
     if(argc < )
     {
         printf("argument not enough\neg:./app Ip Port sourceDir\n");
         exit();
     }

     int ret = chdir(argv[]);
     if(- == ret)
     {
         perror("chdir error");
         exit();
     }
     else
     {
         printf("chdir successful,to -> %s\n",argv[]);
     }

     struct event_base* base = event_base_new();

     struct evconnlistener* listen = libev_start(base,argv[],atoi(argv[]));

     event_base_dispatch(base);

     evconnlistener_free(listen);
     event_base_free(base);

     return  ;
 }

接下来是 调用libevent框架了 （重头戏来了 注意回调的设置哦）：

 // File Name: _libev.c
 // Author: jiujue
 // Created Time: 2019年04月05日 星期五 19时54分08秒
 #include "head.h"
 #define PATH_OF_404_ "404.html"

 void read_cb(struct bufferevent* bufev, void* arg)
 {
     printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<,,Happen read_cb\n");
     char buf[] = {}, method[] = {}, path[] = {}, protocol[] = {};
     bufferevent_read(bufev,buf,sizeof(buf));
     //printf("-----------------------recv http request :%s\n",buf);
     sscanf(buf,"%s %s %s",method,path,protocol);
     char *file = path+;
     if( == (strcmp(path,"/") ) )
     {
         file = (char*)"./";
     }

     int isFile = judge_type_dir_or_nondir(file);
     printf("fffffffff          is %d \n",isFile);
     if( == isFile)
     {//is palin file
         printf("send file <name>>%s\n",file);
         send_file(bufev,file);
     }
     if(isFile == ){//is dir
         printf("send dir <name>>%s\n",file);
         send_html_head(bufev,,"OK",(char*)"text/html");
         send_dir_asheml(bufev,file,NULL);
     }
     else if(- == isFile)
     {//is not found file or directory
         printf("send 404 <name>>%s\n",file);
         send_file(bufev,PATH_OF_404_);
     }

 }

 void write_cb(struct bufferevent* bufev, void* arg)
 {
     struct sockaddr_in *cli = (struct sockaddr_in*)arg;
     char buf[] = {};
     printf("Sent respond to cli,Ip ->%s and Port ->%d\n",
             inet_ntop(AF_INET,&(cli->sin_addr.s_addr), buf,sizeof(buf)),
             ntohs(cli->sin_port) );
 }

 void event_cb(struct bufferevent* bufev, short ev, void* arg)
 {
     printf("event_cb successful\n");
     if(ev & BEV_EVENT_EOF)
     {
         struct sockaddr_in *cli = (struct sockaddr_in*)arg;
         char buf[] = {};
         printf("Have client disconnect, Ip ->%s and Port ->%d\n",
                 inet_ntop(AF_INET,&(cli->sin_addr.s_addr), buf,sizeof(buf)),
                 ntohs(cli->sin_port) );

     }
     if(ev & BEV_EVENT_ERROR )
     {
         printf("******************************** Happy Error******************************\n");
     }
     bufferevent_free(bufev);
 }

 void listener_cb(struct evconnlistener *listener,
         evutil_socket_t fd, struct sockaddr* cli,
         int cli_len, void* arg)
 {

     printf("<<<<<<<<<<<<<<<<<<<<,,,,,,,,, listener_cb successful\n");
     struct event_base* base = (struct event_base*)arg;

     struct bufferevent* bufev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
     bufferevent_setcb(bufev, read_cb, write_cb, event_cb,cli);
     bufferevent_enable(bufev,EV_READ);

 }

 struct evconnlistener* libev_start(struct event_base*base, const char* Ip,int Port)
 {

     struct sockaddr_in ser;
     ser.sin_family = AF_INET;
     ser.sin_port = htons(Port);
     inet_pton(AF_INET,Ip,&(ser.sin_addr.s_addr));

     struct evconnlistener* ret =  evconnlistener_new_bind(base, listener_cb, base,
             LEV_OPT_REUSEABLE | LEV_OPT_CLOSE_ON_FREE, ,
             (struct sockaddr *)&ser, sizeof(ser));

     if(ret == NULL)
     {
         return NULL;
     }

     return ret;
 }

然后是 发送文件和目录的回调“

　　文件的：

 #include "head.h"

 int send_file(struct bufferevent *bufev,char* file)
 {

     int ffd = open(file,O_RDONLY);
     if(- == ffd)
     {
         printf("sourceFilePath : %s\n",file);
         perror("open sourceFile error");

     }

     char file_read_buf[];
     int read_len = ;

     char * type = get_file_type(file);

     send_html_head(bufev,, "OK", type);

     while((read_len=read(ffd, file_read_buf,sizeof(file_read_buf))) > )
     {
         if( == read_len)
         {
             break;
         }
         bufferevent_write(bufev,file_read_buf,read_len);;
         file_read_buf[strlen(file_read_buf)+] = '\n';
         printf("send message :%s\n",file_read_buf);
         memset(file_read_buf,,sizeof(file_read_buf));
     }

     printf("close ...\n");
     close(ffd);
     return ;
 }

　　目录的（这里拼接网页的时候要细心 非常细心的那种 ）：

 // File Name: _send_dir.c
 // Author: jiujue
 // Created Time: 2019年04月05日 星期五 19时27分18秒

 #include "head.h"
 #define MAXFORGTML_ 4096

 int send_dir_asheml(struct bufferevent *bufev, char *dirname, void* arg)
 {
     printf("******************send_dir name is %s\n",dirname);

     char* buf_dir_html = (char *)malloc(MAXFORGTML_);
     struct dirent **ptr;
     int dir_total_num = scandir(dirname,&ptr,NULL,alphasort);

     //html head
     sprintf(buf_dir_html,"<!doctype HTML>\
                                 <html>\
                                     <head>\
                                         <title>Curent dir:%s</title>\
                                     </head>\
                                     <body>\
                                         <h1>Curretn Dir Content:%s </h1>\
                                         <table>\
                                             <tr>\
                                                 <td>Name</td><td>Size</td><td>Type</td>\
                                             </tr>",dirname,dirname);
     bufferevent_write(bufev,buf_dir_html,strlen(buf_dir_html));

     for(int i=;i<dir_total_num;++i)
     {
         char buf_current_name[] = {};
         if(  == strcmp(dirname,"./"))
         {
             sprintf(buf_current_name,"%s%s",dirname,ptr[i]->d_name);
         }
         else
         {
             sprintf(buf_current_name,"%s/%s",dirname,ptr[i]->d_name);
         }
         printf("++++++++++++++++++++send cur dir <name>>%s\n",buf_current_name);
         struct stat st;
         memset(&st,,sizeof(st));
         stat(buf_current_name,&st);

         sprintf(buf_dir_html,
                                         "<tr>\
                                             <td><a href=\"%s\">%s</a></td>\
                                             <td>%ld</td>\
                                             <td>%s</td>\
                                         </tr>",
                 buf_current_name,
                 ptr[i]->d_name,st.st_size,
                 judge_type_dir_or_nondir(buf_current_name)!= ?"dir":"plain file");
         bufferevent_write(bufev,buf_dir_html,strlen(buf_dir_html));
         memset((char*)buf_dir_html,,sizeof(buf_dir_html));
     }

     //html end
     sprintf(buf_dir_html,
                                         "</table>\
                                     </body>\
                                 </html>");
     bufferevent_write(bufev,buf_dir_html,strlen(buf_dir_html));
     bufferevent_write(bufev,"\r\n",);

     free(buf_dir_html);
     return ;
 }

最后就是一些小函数了： 判断文件类型 和是否为目录：

　　判断文件类型（这里如果出问题 打开图片等时会出现问题）：

 // File Name: _get_file_type.c
 // Author: jiujue
 // Created Time: 2019年04月06日 星期六 19时14分07秒

 #include "head.h"

 const char *get_file_type(const char *name)
 {
     char* dot;

     dot = strrchr(name, '.');
     if (dot == NULL)
         return "text/plain; charset=utf-8";
     if (strcmp(dot, ".html") ==  || strcmp(dot, ".htm") == )
         return "text/html; charset=utf-8";
     if (strcmp(dot, ".jpg") ==  || strcmp(dot, ".jpeg") == )
         return "image/jpeg";
     if (strcmp(dot, ".gif") == )
         return "image/gif";
     if (strcmp(dot, ".png") == )
         return "image/png";
     if (strcmp(dot, ".css") == )
         return "text/css";
     if (strcmp(dot, ".au") == )
         return "audio/basic";
     if (strcmp( dot, ".wav" ) == )
         return "audio/wav";
     if (strcmp(dot, ".avi") == )
         return "video/x-msvideo";
     if (strcmp(dot, ".mov") ==  || strcmp(dot, ".qt") == )
         return "video/quicktime";
     if (strcmp(dot, ".mpeg") ==  || strcmp(dot, ".mpe") == )
         return "video/mpeg";
     if (strcmp(dot, ".vrml") ==  || strcmp(dot, ".wrl") == )
         return "model/vrml";
     if (strcmp(dot, ".midi") ==  || strcmp(dot, ".mid") == )
         return "audio/midi";
     if (strcmp(dot, ".mp3") == )
         return "audio/mpeg";
     if (strcmp(dot, ".ogg") == )
         return "application/ogg";
     if (strcmp(dot, ".pac") == )
         return "application/x-ns-proxy-autoconfig";

     return "text/plain; charset=utf-8";
 }

　　判断是否为目录：

 // File Name: _judge_type.c
 // Author: jiujue
 // Created Time: 2019年04月05日 星期五 20时54分34秒

 #include "head.h"

 int judge_type_dir_or_nondir(const char* name)
 {
     struct stat st;
     int ret = stat(name,&st);
     if(- == ret)
     {
         return -;
     }
     if(S_ISREG(st.st_mode))
     {
         return ;
     }
     if(S_ISDIR(st.st_mode))
     {
         return ;
     }
     else
     {
         return ;
     }

 }

 #if 0
 int main(int argc,char* argv[])
 {
     int ret =  judge_type_dir_or_nondir(argv[]);
     if(ret == )
     {
         printf("is dir ");
     }
     if(ret == )
     {
         printf("is  file");
     }
     return ;
 }
 #endif

注：以上代码已测验，基本没有问题（bug 肯定有 欢迎提出）

结语：有问题欢迎提在下方 ，本人在校学生，时间较为充裕， 有时间会回复的。

/* 原创文章 转载请附上原链接: https://www.cnblogs.com/jiujue/p/10707153.html   */