Recursive, rlsd, rlsrlsd

Recursive, rlsd, rlsrlsd

The server-side program generally has the following processes: bind, listen, and accept. Then there are various operations after the client and the server are connected.

In contrast, the client program is relatively simple. You only need to obtain the sock_id first and connect it with the corresponding sock. The others are as follows.

Server code:

 1 #include<stdio.h> 2 #include<unistd.h> 3 #include<sys/types.h> 4 #include<sys/socket.h> 5 #include<netinet/in.h> 6 #include<netdb.h> 7 #include<time.h> 8 #include<string.h> 9 #define PORTNUM 1500010 #define HOSTLEN 25611 #define oops(msg) {printf("error:%s\n",msg);return 1;}12 int main(int ac,char * av[]){13     struct sockaddr_in saddr;14     struct hostent * hp;15     char hostname[HOSTLEN];16     int sock_id,sock_fd;17     FILE * sock_fpi,* sock_fpo;18     FILE * pipe_fp;19     char dirname[BUFSIZ];20     char command[BUFSIZ];21     int dirlen,c;22     sock_id=socket(PF_INET,SOCK_STREAM,0);//set socket23     if(sock_id==-1)24         oops("socket");25     bzero((void *)&saddr,sizeof(saddr));//empty saddr26     gethostname(hostname,HOSTLEN);27     printf("hostname:%s\n",hostname);28     hp=gethostbyname(hostname);29     bcopy((void *)hp->h_addr,(void *)&saddr.sin_addr,hp->h_length);30     saddr.sin_port=htons(PORTNUM);31     saddr.sin_family=AF_INET;32     if(bind(sock_id,(struct sockaddr *)&saddr,sizeof(saddr))!=0)//bind address33         oops("bind");34     if(listen(sock_id,1)!=0)//listen35         oops("listen");36     while(1){37         sock_fd=accept(sock_id,NULL,NULL);//start accept38         if(sock_fd==-1)39             oops("accept");40         if((sock_fpi=fdopen(sock_fd,"r"))==NULL)41             oops("fdopen reading");42         if(fgets(dirname,BUFSIZ-5,sock_fpi)==NULL)43             oops("reading dirname");44         sanitize(dirname);45         if((sock_fpo=fdopen(sock_fd,"w"))==NULL)46             oops("fdopen writing");47         sprintf(command,"ls %s",dirname);48         if((pipe_fp=popen(command,"r"))==NULL)49             oops("popen");50         while((c=getc(pipe_fp))!=EOF)51             putc(c,sock_fpo);52         pclose(pipe_fp);53         pclose(sock_fpo);54         pclose(sock_fpi);55     }56 }57 sanitize(char * str){58     char * src,* dest;59     for(src=dest=str;*src;src++)60         if(*src=='/'||isalnum(*str))61             *dest++=*src;62     *dest='\0';63 }

Client code:

 1 #include<stdio.h> 2 #include<linux/types.h> 3 #include<sys/socket.h> 4 #include<netinet/in.h> 5 #include<netdb.h> 6 #define oops(msg) {printf("error:%s\n",msg);return 1;} 7 #define PORTNUM 15000 8 main(int ac,char * av[]){ 9     struct sockaddr_in servadd;10     struct hostent * hp;11     int sock_id,sock_fd;12     char message[BUFSIZ];13     char buffer[BUFSIZ];14     int messlen,n_read;15     sock_id=socket(PF_INET,SOCK_STREAM,0);//attention:PF_INT NOT AF_INT16     if(sock_id==-1)17         oops("socket");18     bzero(&servadd,sizeof(servadd));19     hp=gethostbyname(av[1]);20     if(hp==NULL)21         oops(av[1]);22     bcopy(hp->h_addr,(struct sockaddr *)&servadd.sin_addr,hp->h_length);23     servadd.sin_port=htons(PORTNUM);24     servadd.sin_family=AF_INET;25     if(connect(sock_id,(struct sockaddr *)&servadd,sizeof(servadd))!=0)//connect26         oops("connect");27     if(write(sock_id,av[2],strlen(av[2]))==-1)28         oops("write");29     if(write(sock_id,"\n",1)==-1)30         oops("write");31     while((n_read=read(sock_id,buffer,BUFSIZ))>0)32         if(write(1,buffer,n_read)==-1)33             oops("write");34         close(sock_id);35 }

The call is as follows:

Server startup:./rlsd &

Client Access:./rls jsonzhang-Vostro-23-3340 ~ /Desktop/workplace/