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/