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  • [置顶] 在Ubuntu下实现一个简单的Web服务器

    要求:

    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" name="firstname"/>
    <br/>
    Last name:
    <input type="test" name="Lastname"/>
    </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 ...
    ");
    	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.
    ");
    				break;	
    			}
    			printf("received  File from %s at PORT %d
    ",
                    inet_ntop(AF_INET,&cliaddr.sin_addr,str,sizeof(str)),
                                    ntohs(cliaddr.sin_port));
    			i=0;
    			char title[15];
    			while(buf[i]!='
    '){
    				title[i]=buf[i];
    				i++;
    			}
    			title[i]='';
    			if(0==(strcmp(title,"GET / HTTP/1.1"))){
    				bzero(buf,MAXLINE);	
    				strcpy(buf,"HTTP/1.1 200 0K
    ");
    				write(connfd,buf,strlen(buf));
    				bzero(buf,MAXLINE);
    				strcpy(buf,"Conent_Type: peizhi/html
    ");
    				write(connfd,buf,strlen(buf));
    				bzero(buf,MAXLINE);
    				buf[0]='
    ';
    				buf[1]='
    ';
    				write(connfd,buf,2);
    				pd_index=open("./peizhi/index.html",O_RDONLY);
    				if(pd_index<0){
    					perror("open file failed.
    ");
    					exit(1);
    				}
    				bzero(buf,MAXLINE);
    				while((ret=read(pd_index,buf,MAXLINE))>0){
    					write(connfd,buf,ret);
    					printf("send index data...
    ");
    					bzero(buf,MAXLINE);
    				}
    			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.
    ");
    		exit(1);
    	}
    	fscanf(fd,"PORT=%d
    Directory=%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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  • 原文地址:https://www.cnblogs.com/riskyer/p/3358066.html
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