在Ubuntu下实现一个简单的Web服务器,当服务器启动时要读取配置文件的路径。如果浏览器请求的文件是可执行的则称为CGI程序,服务器并不是将这个文件发给浏览器,而是在服务器端执行这个程序,将它的标准输出发给浏览器,服务器不发送完整的HTTP协议头,CGI程序自己负责输出一部分HTTP协议头。
配置文件(config.txt):
PORT=8000
Directory=./peizhi
HTML文件(index_html):
<form>
First name:
<input type="text"/>
<br/>
Last name:
<input type="test"/>
</from>
服务器代码:
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define MAXLINE 80
void deal_config(int *port_number,char *path);
int main(void)
{
struct sockaddr_in servaddr,cliaddr;
socklen_t cliaddr_len;
int listenfd,connfd;
char buf[MAXLINE];
char str[INET_ADDRSTRLEN];
int i,n; //n descript the side number
int pd_index,ret;
int td;
int port_number;
char *path=NULL;
listenfd=socket(AF_INET,SOCK_STREAM,0);
int opt=1;
setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
deal_config(&port_number,path);
servaddr.sin_addr.s_addr=htonl(INADDR_ANY);
servaddr.sin_port=htons(port_number);
bind(listenfd,(struct sockaddr *)&servaddr,sizeof(servaddr));
listen(listenfd,20);
printf("Accepting connections ...\n");
while(1){
cliaddr_len=sizeof(cliaddr);
connfd=accept(listenfd,
(struct sockaddr *)&cliaddr,&cliaddr_len);
while(1){
n=read(connfd,buf,MAXLINE);
if(n==0){
printf("the other side has been closed.\n");
break;
}
printf("received File from %s at PORT %d\n",
inet_ntop(AF_INET,&cliaddr.sin_addr,str,sizeof(str)),
ntohs(cliaddr.sin_port));
i=0;
char title[15];
while(buf[i]!='\r'){
title[i]=buf[i];
i++;
}
title[i]='\0';
if(0==(strcmp(title,"GET / HTTP/1.1"))){
bzero(buf,MAXLINE);
strcpy(buf,"HTTP/1.1 200 0K\r\n");
write(connfd,buf,strlen(buf));
bzero(buf,MAXLINE);
strcpy(buf,"Conent_Type: peizhi/html\r\n");
write(connfd,buf,strlen(buf));
bzero(buf,MAXLINE);
buf[0]='\r';
buf[1]='\n';
write(connfd,buf,2);
pd_index=open("./peizhi/index.html",O_RDONLY);
if(pd_index<0){
perror("open file failed.\n");
exit(1);
}
bzero(buf,MAXLINE);
while((ret=read(pd_index,buf,MAXLINE))>0){
write(connfd,buf,ret);
printf("send index data...\n");
bzero(buf,MAXLINE);
}
<SPAN> </SPAN>close(pd_index);
}
}
}
}
void deal_config(int *port_number,char *path)
{
FILE *fd;
fd=fopen("./peizhi/config.txt","r");
if(fd<0){
perror("open config failed.\n");
exit(1);
}
fscanf(fd,"PORT=%d\nDirectory=%s",port_number,path);
}
启动服务器,打开浏览器输入127.0.0.1:8000可得如下界面:
程序不是很完善,会慢慢改进,希望大家批评指正。
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