rls与rlsd

服务器端的程序一般有如下几个过程，首先是bind，然后再是listen,最后是accept。再往后就是客户端与服务器连接后的各种操作了。

相比之下，客户端的程序就比较简单了，只需先获得sock_id，再与对应的sock进行connect，其他如下。

服务器端代码：

 #include<stdio.h>
 #include<unistd.h>
 #include<sys/types.h>
 #include<sys/socket.h>
 #include<netinet/in.h>
 #include<netdb.h>
 #include<time.h>
 #include<string.h>
 #define PORTNUM 15000
 #define HOSTLEN 256
 #define oops(msg) {printf("error:%s\n",msg);return 1;}
 int main(int ac,char * av[]){
     struct sockaddr_in saddr;
     struct hostent * hp;
     char hostname[HOSTLEN];
     int sock_id,sock_fd;
     FILE * sock_fpi,* sock_fpo;
     FILE * pipe_fp;
     char dirname[BUFSIZ];
     char command[BUFSIZ];
     int dirlen,c;
     sock_id=socket(PF_INET,SOCK_STREAM,);//set socket
     if(sock_id==-)
         oops("socket");
     bzero((void *)&saddr,sizeof(saddr));//empty saddr
     gethostname(hostname,HOSTLEN);
     printf("hostname:%s\n",hostname);
     hp=gethostbyname(hostname);
     bcopy((void *)hp->h_addr,(void *)&saddr.sin_addr,hp->h_length);
     saddr.sin_port=htons(PORTNUM);
     saddr.sin_family=AF_INET;
     if(bind(sock_id,(struct sockaddr *)&saddr,sizeof(saddr))!=)//bind address
         oops("bind");
     if(listen(sock_id,)!=)//listen
         oops("listen");
     while(){
         sock_fd=accept(sock_id,NULL,NULL);//start accept
         if(sock_fd==-)
             oops("accept");
         if((sock_fpi=fdopen(sock_fd,"r"))==NULL)
             oops("fdopen reading");
         if(fgets(dirname,BUFSIZ-,sock_fpi)==NULL)
             oops("reading dirname");
         sanitize(dirname);
         if((sock_fpo=fdopen(sock_fd,"w"))==NULL)
             oops("fdopen writing");
         sprintf(command,"ls %s",dirname);
         if((pipe_fp=popen(command,"r"))==NULL)
             oops("popen");
         while((c=getc(pipe_fp))!=EOF)
             putc(c,sock_fpo);
         pclose(pipe_fp);
         pclose(sock_fpo);
         pclose(sock_fpi);
     }
 }
 sanitize(char * str){
     char * src,* dest;
     for(src=dest=str;*src;src++)
         if(*src=='/'||isalnum(*str))
             *dest++=*src;
     *dest='\0';
 }

客户端代码：

 #include<stdio.h>
 #include<linux/types.h>
 #include<sys/socket.h>
 #include<netinet/in.h>
 #include<netdb.h>
 #define oops(msg) {printf("error:%s\n",msg);return 1;}
 #define PORTNUM 15000
 main(int ac,char * av[]){
     struct sockaddr_in servadd;
     struct hostent * hp;
     int sock_id,sock_fd;
     char message[BUFSIZ];
     char buffer[BUFSIZ];
     int messlen,n_read;
     sock_id=socket(PF_INET,SOCK_STREAM,);//attention:PF_INT NOT AF_INT
     if(sock_id==-)
         oops("socket");
     bzero(&servadd,sizeof(servadd));
     hp=gethostbyname(av[]);
     if(hp==NULL)
         oops(av[]);
     bcopy(hp->h_addr,(struct sockaddr *)&servadd.sin_addr,hp->h_length);
     servadd.sin_port=htons(PORTNUM);
     servadd.sin_family=AF_INET;
     if(connect(sock_id,(struct sockaddr *)&servadd,sizeof(servadd))!=)//connect
         oops("connect");
     if(write(sock_id,av[],strlen(av[]))==-)
         oops("write");
     if(write(sock_id,"\n",)==-)
         oops("write");
     while((n_read=read(sock_id,buffer,BUFSIZ))>)
         if(write(,buffer,n_read)==-)
             oops("write");
         close(sock_id);
 }

调用如下：

服务器启动：./rlsd&

客户端访问：./rls jsonzhang-Vostro-23-3340 ~/桌面/workplace/