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KASUS

Matakuliah : H0483 – Network Programming Tahun : 2008 Versi : 2.0. KASUS. MERANCANG Program Transfer File (PTF) PTFServer dan PTFClient. Learning Outcomes. Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu :

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KASUS

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  1. Matakuliah : H0483 – Network Programming Tahun : 2008 Versi : 2.0 KASUS MERANCANG Program Transfer File (PTF) PTFServer dan PTFClient

  2. Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : • Mendemonstrasikan program aplikasi Client Server untuk mentransfer file

  3. Outline Materi • Merancang Flow Control • Merancang Protokol • Membuat Program Server • Membuat Program Client • Compilasi & Testing

  4. Rancangan

  5. Rancangan

  6. Implementasi Server #define SERVER_PORT_ID 6081 #define CLIENT_PORT_ID 6086 #define SERVER_HOST_ADDR "192.168.90.15" #define MAXSIZE 512 #define ACK 2 #define NACK 3 #define REQUESTFILE 100 #define COMMANDNOTSUPPORTED 150 #define COMMANDSUPPORTED 160 #define BADFILENAME 200 #define FILENAMEOK 400 #define STARTTRANSFER 500

  7. Implementasi Server #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <time.h> #include <errno.h> #define MY_PORT_ID 6081 #define MAXLINE 256 #define MAXSIZE 512 #define ACK 2 #define NACK 3 #define REQUESTFILE 100 #define COMMANDNOTSUPPORTED 150 #define COMMANDSUPPORTED 160 #define BADFILENAME 200 #define FILENAMEOK 400

  8. Implementasi Server int writen(int sd,char *ptr,int size); int readn(int sd,char *ptr,int size); int len; main() { int sockid, newsd, pid, clilen; struct sockaddr_in my_addr, client_addr; printf("server: creating socket\n"); sockid = socket(AF_INET,SOCK_STREAM,0); if(sockid < 0){ printf("socket error: %d\n", errno); exit(0); }

  9. Implementasi Server printf("binding my local socket\n"); bzero((char *) &my_addr,sizeof(my_addr)); my_addr.sin_family = AF_INET; my_addr.sin_port = htons(MY_PORT_ID); my_addr.sin_addr.s_addr=htons(INADDR_ANY); if(bind(sockid ,(struct sockaddr *) &my_addr,sizeof(my_addr)) < 0){ printf("bind error:%d\n", errno); exit(0); } printf("server: starting listen \n"); if(listen(sockid,5) < 0){ printf("listen error :%d\n",errno); exit(0); }

  10. Implementasi Server while(1){ printf("server: starting accept\n"); if((newsd=accept(sockid,(struct sockaddr*) &client_addr,&clilen))<0){ printf("accept error:%d\n", errno); exit(0); } doftp(newsd); } }

  11. Implementasi Server doftp(int newsd){ int i,fsize,fd,msg_ok,fail; int fail1,req,c,ack; int no_read ,num_blks; int num_blks1,num_last_blk; int num_last_blk1,tmp; char fname[MAXLINE]; char out_buf[MAXSIZE]; FILE *fp; no_read = 0; num_blks = 0; num_last_blk = 0;

  12. Implementasi Server req = 0; if((readn(newsd,(char *)&req,sizeof(req))) < 0){ printf("read error %d\n",errno);exit(0); } req = ntohs(req); printf("client request code is: %d\n",req); if(req!=REQUESTFILE){ printf("unsupported operation. goodbye\n"); msg_ok = COMMANDNOTSUPPORTED; msg_ok = htons(msg_ok); if((writen(newsd,(char *)&msg_ok,sizeof(msg_ok)))<0){ printf("write error :%d\n",errno); exit(0); } exit(0); }

  13. Implementasi Server msg_ok = COMMANDSUPPORTED; msg_ok = htons(msg_ok); if((writen(newsd,(char *) &msg_ok,sizeof(msg_ok))) < 0){ printf("write error :%d\n",errno); exit(0); } fail = FILENAMEOK; if((len=read(newsd,fname,MAXLINE)) < 0) { printf("filename read error :%d\n",errno); fail = BADFILENAME ; } fname[len]='\0';

  14. Implementasi Server if((fp=fopen(fname,"r"))==NULL)fail= BADFILENAME; tmp = htons(fail); if((writen(newsd,(char *)&tmp,sizeof(tmp))) < 0){ printf("write error :%d\n",errno);exit(0); } if(fail==BADFILENAME){ printf("server cant open file\n"); close(newsd); exit(0); } printf("filename is %s\n",fname); req = 0; if((readn(newsd,(char *)&req,sizeof(req)))<0){ printf("read error :%d\n",errno);exit(0); } printf("start transfer,%d, received\n",ntohs(req));

  15. Implementasi Server printf("starting transfer\n"); fsize = 0;ack = 0; while((c=getc(fp))!=EOF) fsize++; num_blks = fsize / MAXSIZE; num_blks1 = htons(num_blks); num_last_blk = fsize % MAXSIZE; num_last_blk1 = htons(num_last_blk); if((writen(newsd,(char *)&num_blks1, sizeof(num_blks1)))< 0){ printf("write error :%d\n",errno); exit(0); } printf("told client there are %d blocks\n", num_blks);

  16. Implementasi Server if((readn(newsd,(char *)&ack,sizeof(ack))) < 0){ printf("ack read error :%d\n",errno); exit(0); } if(ntohs(ack) != ACK){ printf("ACK not received on file size\n"); exit(0); } if((writen(newsd,(char *)&num_last_blk1, sizeof(num_last_blk1))) < 0){ printf("write error :%d\n",errno);exit(0); } printf("told client %d bytes in last block\n", num_last_blk); if((readn(newsd,(char *)&ack,sizeof(ack))) < 0){ printf("ack read error :%d\n",errno);exit(0); }

  17. Implementasi Server if(ntohs(ack) != ACK){ printf("ACK not received on file size\n"); exit(0); } rewind(fp);

  18. Implementasi Server for(i= 0; i < num_blks; i ++){ no_read = fread(out_buf,sizeof(char),MAXSIZE,fp); if (no_read == 0){ printf("file read error\n"); exit(0); } if (no_read != MAXSIZE){ printf("file read error\n"); exit(0); } if((writen(newsd,out_buf,MAXSIZE)) < 0){ printf("error sending block:%d\n",errno);exit(0); } if((readn(newsd,(char *)&ack,sizeof(ack))) < 0){ printf("ack read error :%d\n",errno);exit(0); } if (ntohs(ack) != ACK){ printf("ACK not received for block %d\n",i); exit(0); } printf("%d\r",i); }

  19. Implementasi Server if(num_last_blk > 0){ printf("%d\n",num_blks); no_read = fread(out_buf,sizeof(char),num_last_blk,fp); if (no_read == 0){ printf("server: file read error\n"); exit(0); } if (no_read != num_last_blk){ printf("file read error : no_read is less 2\n");exit(0); } if((writen(newsd,out_buf,num_last_blk)) < 0){ printf("server: file transfer error %d\n",errno);exit(0); } if((readn(newsd,(char *)&ack,sizeof(ack))) < 0){ printf("server: ack read error %d\n",errno);exit(0); } if(ntohs(ack) != ACK) { printf("server: ACK not received last block\n"); exit(0); } } else printf("\n");

  20. Implementasi Server /* FILE TRANSFER ENDS */ printf("FILE TRANSFER COMPLETE on socket %d\n",newsd); fclose(fp); close(newsd); }

  21. Implementasi Client #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <time.h> #include <errno.h> #define SERVER_PORT_ID 6081 #define CLIENT_PORT_ID 6086 #define SERVER_HOST_ADDR "192.168.90.15" #define MAXSIZE 512

  22. Implementasi Client #define ACK 2 #define NACK 3 #define REQUESTFILE 100 #define COMMANDNOTSUPPORTED 150 #define COMMANDSUPPORTED 160 #define BADFILENAME 200 #define FILENAMEOK 400 #define STARTTRANSFER 500 int readn(int sd,char *ptr,int size); int writen(int sd,char *ptr,int size);

  23. Implementasi Client main(int argc,char *argv[]) { int sockid, newsockid, i, getfile; int ack, msg, msg_2, c, len; int no_writen,start_xfer, num_blks,num_last_blk; struct sockaddr_in my_addr, server_addr; FILE *fp; char in_buf[MAXSIZE]; if(argc != 2){ printf("error: usage : ftp filename\n"); exit(0); }

  24. Implementasi Client no_writen = 0; num_blks = 0; num_last_blk = 0; len = strlen(argv[1]); printf("client: creating socket\n"); if((sockid=socket(AF_INET,SOCK_STREAM,0))< 0){ printf("client: socket error : %d\n", errno); exit(0); }

  25. Implementasi Client printf("client: binding my local socket\n"); bzero((char *) &my_addr,sizeof(my_addr)); my_addr.sin_family = AF_INET; my_addr.sin_addr.s_addr = htonl(INADDR_ANY); my_addr.sin_port = htons(CLIENT_PORT_ID); if(bind(sockid ,(struct sockaddr *) &my_addr, sizeof(my_addr)) < 0){ printf("client: bind error :%d\n", errno); exit(0); }

  26. Implementasi Client printf("client: starting connect\n"); bzero((char *)&server_addr,sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr=inet_addr(SERVER_HOST_ADDR); server_addr.sin_port = htons(SERVER_PORT_ID); if(connect(sockid ,(struct sockaddr *) &server_addr, sizeof(server_addr)) < 0){ printf("client: connect error :%d\n", errno); exit(0); }

  27. Implementasi Client getfile = htons(REQUESTFILE); printf("sending command request to ftp server\n"); if((writen(sockid,(char *)&getfile, sizeof(getfile))) < 0){ printf("write error:%d\n", errno); exit(0); } msg = 0; if((readn(sockid,(char *)&msg,sizeof(msg)))< 0){ printf("read error:%d\n", errno); exit(0); } msg = ntohs(msg); if(msg==COMMANDNOTSUPPORTED){ printf("server refused command\n"); exit(0); } else printf("server replied %d, command supported\n",msg);

  28. Implementasi Client /* send file name to server */ printf("client: sending filename\n"); if((writen(sockid,argv[1],len))< 0){ printf("write error:%d\n", errno); xit(0); } msg_2 = 0; if((readn(sockid,(char *)&msg_2, sizeof(msg_2)))< 0){ printf("read error:%d\n", errno); exit(0); } msg_2 = ntohs(msg_2); if(msg_2 == BADFILENAME){ printf("server reported bad file name\n"); exit(0); } else printf("server replied filename OK\n");

  29. Implementasi Client printf("sending start transfer command\n"); start_xfer = STARTTRANSFER; start_xfer = htons(start_xfer); if((writen(sockid,(char *)&start_xfer,m sizeof(start_xfer)))< 0){ printf("write error:%d\n", errno); exit(0); } if((fp = fopen(argv[1],"w")) == NULL){ printf("local open file error\n");exit(0); }

  30. Implementasi Client if((readn(sockid,(char *)&num_blks, sizeof(num_blks))) < 0){ printf("read error on nblocks :%d\n",errno); exit(0); } num_blks = ntohs(num_blks); printf("server responded: %d blocks in file\n",num_blks); ack = ACK; ack = htons(ack); if((writen(sockid,(char*)&ack,sizeof(ack)))<0){ printf("ack write error :%d\n",errno); exit(0); }

  31. Implementasi Client if((readn(sockid,(char *)&num_last_blk, sizeof(num_last_blk))) < 0){ printf("read error:%d on nbytes\n",errno); exit(0); } num_last_blk = ntohs(num_last_blk); printf("server responded: %d bytes last blk\n", num_last_blk); if((writen(sockid,(char *)&ack,sizeof(ack)))<0){ printf("write error:%d\n",errno); exit(0); }

  32. Implementasi Client printf("client: starting to get file contents\n"); for(i= 0; i < num_blks; i ++) { if((readn(sockid,in_buf,MAXSIZE)) < 0){ printf("block error read: %d\n",errno); exit(0); } no_writen=fwrite(in_buf,sizeof(char),MAXSIZE,fp); if(no_writen == 0){ printf("file write error\n");exit(0); } if (no_writen != MAXSIZE){ printf("write error: no_writen is less\n"); exit(0); } if((writen(sockid,(char *)&ack,sizeof(ack))) < 0){ printf("ack write error :%d\n",errno);exit(0); } printf(" %d...",i); }

  33. Implementasi Client if(num_last_blk > 0){ printf("%d\n",num_blks); if((readn(sockid,in_buf,num_last_blk)) < 0){ printf("last block error read :%d\n",errno); exit(0); } no_writen=fwrite(in_buf,sizeof(char),num_last_blk,fp); if(no_writen == 0){ printf("last block file write err :%d\n",errno); exit(0); } if(no_writen != num_last_blk){ printf("file write error : no_writen is less 2\n"); exit(0); } if((writen(sockid,(char *)&ack,sizeof(ack))) < 0){ printf("ack write error:%d\n",errno); exit(0); } } else printf("\n");

  34. Implementasi Client fclose(fp); printf("FILE TRANSFER COMPLETE\n"); close(sockid); }

  35. Fungsi readn() int readn(int sd,char *ptr,int size) { int no_left,no_read; no_left = size; while (no_left > 0){ no_read = read(sd,ptr,no_left); if(no_read <0) return(no_read); if (no_read == 0) break; no_left -= no_read; ptr += no_read; } return(size - no_left); }

  36. Fungsi writen() int writen(int sd, char *ptr,int size) { int no_left, no_written; no_left = size; while(no_left > 0){ no_written=write(sd, ptr,no_left); if(no_written <=0)return(no_written); no_left -= no_written; ptr += no_written; } return(size - no_left); }

  37. TUGAS • Contoh kasus diatas, servernya tidak bisa melayani lebih dari satu client. • Modifikasi program PTFServer diatas agar bisa melayani banyak client dengan menggunakan : • multi proses ( system call fork() ), satu proses melayani satu client • Multi threading ( satu thread melayani satu client ).

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