本设计设计的web服务器,根据服务机上指定的网页为默认网页,存储于本地,从浏览器中输入WEB服务器的地址,服务器响应,并发送默认网页给浏览器,由于默认网页中包含图片的内容,当浏览器读到该照片内容时,再向服务器发送照片请求,服务器响应请求,把浏览器所需要的内容打开,发送给浏览器。
本设计牵涉到 http协议,需根据协议信息头,分辨浏览器发送的请求内容,再做答复。答复中,也需要遵守http协议,先发送协议头,以便浏览器辨认识别。本文中采用了sscanf截取浏览器发送的http协议头中的文件信息。
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#include <sys/types.h>
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#include <sys/socket.h> // 包含套接字函数库
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#include <stdio.h>
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#include <netinet/in.h> // 包含AF_INET相关结构
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#include <arpa/inet.h> // 包含AF_INET相关操作的函数
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#include <unistd.h>
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#include<string.h>
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#include<stdlib.h>
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#include<fcntl.h>
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#include<sys/stat.h>
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#include<dirent.h>
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#define PORT 80
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#define FILENAME "my.html"
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#define SIZE 100
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int main()
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{
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int server_sockfd,client_sockfd;
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int server_len,client_len;
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struct sockaddr_in server_sockaddr,client_sockaddr;
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server_sockfd = socket(AF_INET,SOCK_STREAM, 0); // 定义套接字类型
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server_sockaddr.sin_family=AF_INET;
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server_sockaddr.sin_port=htons(PORT);
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server_sockaddr.sin_addr.s_addr=INADDR_ANY;
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server_len=sizeof(server_sockaddr);
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//允许重复使用本地地址和套接字绑定
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int j=1;
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setsockopt(server_sockfd,SOL_SOCKET,SO_REUSEADDR,&j,sizeof(j));
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//绑定端口
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if(bind(server_sockfd,(struct sockaddr *)&server_sockaddr,server_len)==-1)
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{
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perror("bind:");
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exit(1);
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}
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//监听端口
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if(listen(server_sockfd,5)==-1)
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{
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perror("listen:");
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exit(1);
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}
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printf("Listening...\n");
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unsigned char data_buf[2048];
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int i;
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struct stat statbuf;
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while(1)
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{
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if((client_sockfd=accept(server_sockfd,(struct sockaddr *)&client_sockaddr,&client_len))==-1)
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{
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perror("accept error:");
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exit(1);
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}
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printf("%s linked\n",inet_ntoa(client_sockaddr.sin_addr));
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// printf("Send Msg...\n");
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bzero(data_buf,sizeof(data_buf));
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i=recv(client_sockfd,data_buf,sizeof(data_buf),0);
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printf("*********(%d)bytes recv******\n",i);
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printf("data_buf=%s\n",data_buf);
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printf("+++++++++++++++++++++++++++++\n");
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if(0==strncmp(data_buf,"GET / HTTP",10)) //发送网页文件
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{
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FILE *fp;
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fp=fopen("my.html","r");
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lstat("my.html",&statbuf);
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bzero(data_buf,sizeof(data_buf));
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sprintf(data_buf,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nContent-Length: %ld\r\n\r\n",statbuf.st_size);
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int file_length;
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do
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{
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file_length=fread(data_buf,sizeof(char),2048,fp);
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i=send(client_sockfd,data_buf,strlen(data_buf),0);
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// printf("send html bytes:i=%d\n",i);
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bzero(data_buf,sizeof(data_buf));
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}while(file_length>0);
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fclose(fp);
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}
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else //根据浏览器的请求发送文件
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{
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char fileinfo[SIZE]; //获取请求的文件路径和文件名
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bzero(fileinfo,100);
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char buff[SIZE];
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bzero(buff,sizeof(buff));
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sscanf(data_buf,"%*[^/]/%[^ ]",buff);
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printf("file name buff=%s\n",buff);
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char a[2]={'/'};
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//fileinfo[SIZE]={'/'};
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strcat(fileinfo,a);
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strcat(fileinfo,buff);
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printf("fileinfo=%s\n",fileinfo);
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//if(0==strncmp(data_buf,"GET /home/",10)) //发送图片
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//{
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printf("Send jpg...\n");
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FILE *fp;
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fp=fopen(fileinfo,"r");
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if(fp==NULL)
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{
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perror("fopen failed:");
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}
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lstat(fileinfo,&statbuf); //获取文件属性
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bzero(data_buf,sizeof(data_buf));
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sprintf(data_buf,"HTTP/1.1 200 OK\r\nContent-Type: image/jpg\r\nContent-Length: %ld\r\n\r\n",statbuf.st_size);
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printf("statbuf.st_size=%ld\n",statbuf.st_size);
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int file_block_length;
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do
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{
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file_block_length=fread(data_buf,1,2048,fp);
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printf("file_block_length=%d\n",file_block_length);
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// printf("data_buf=%s\n",data_buf);
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i=send(client_sockfd,data_buf,2048,0);
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printf("send byte i=%d\n",i);
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}while(file_block_length>0);
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printf("send over \n");
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fclose(fp);
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}
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close(client_sockfd);
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}
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}
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