1 / 37

Department of Computer Science Southern Illinois University Edwardsville Spring, 2010

CS 547/490 Network Programming. IP Multicast - Program Implementation. Department of Computer Science Southern Illinois University Edwardsville Spring, 2010 Dr. Hiroshi Fujinoki E-mail: hfujino@siue.edu. IP Multicast/000. Unicast Server and Clients. A client initiates a session

shel
Download Presentation

Department of Computer Science Southern Illinois University Edwardsville Spring, 2010

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CS 547/490 Network Programming IP Multicast - Program Implementation Department of Computer Science Southern Illinois University Edwardsville Spring, 2010 Dr. Hiroshi Fujinoki E-mail: hfujino@siue.edu IP Multicast/000

  2. Unicast Server and Clients A client initiates a session to get a reply from a server Message Request Client Time Server “Pull” Model CS 547 Advanced Network Programming IP Multicast 2/002

  3. Multicast Server and Clients Message Client 1 Client 2 Client 3 Message Message Time Server Multicast sender “sends” message to clients “Push” Model CS 547 Advanced Network Programming IP Multicast 2/003

  4. Reuse Socket Initialize socket Initialize socket Socket() Socket() Set Local Address/Port Bind() Bind() SERVER UDP Connection-less transmission closesocket() closesocket() recvfrom() sendto() Join a multicast group Join a multicast group Disable Loop-back Set Multicast Address Set TTL value CS 547 Advanced Network Programming Procedures in Client and Server Process CLIENT IP Multicast/004

  5. Make sure Winsock 2.X WinSock Version Number (Ver. 2.2) status = WSAStartup(0X0202, &stWSAData); Initialize socket Execution status WinSock data strcuture CS 547 Advanced Network Programming WSADATA stWSAData; // IP Multicast 2/004

  6. AF_INET = IP AF_INET for IP GRAM = UDP Socket_ID = socket(AF_INET, SOCK_DGRAM, 0); Get a datagram socket SOCK_DGRAAM for UDP session Socket ID to identify this socket session CS 547 Advanced Network Programming IP Multicast 2/005

  7. Set the local IP address and port number stLclAddr.sin_family = AF_INET; stLclAddr.sin_addr.s_addr = htonl (INADDR_ANY); stLclAddr.sin_port = 0; SOCKADDR_IN stLclAddr; CS 547 Advanced Network Programming IP Multicast 2/006

  8. Bind the socket Byte size of the stLclAddr structure Pointer to stLclAddr structure Socket ID to identify this socket session CS 547 Advanced Network Programming status = bind (Socket_ID, (struct sockaddr *) &stLclAddr, sizeof (stLclAddr); IP Multicast 2/007

  9. Join the multicast group Multicast Address (Class-D IP Address) Join a multicast group Any NIC if multiple NICs exist CS 547 Advanced Network Programming stMreq.imr_multiaddr.s_addr = inet_addr (archMCAddr) stMreq.imr_interface.s_addr = INADDR_ANY; status = setsockopt (Socket_ID, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) &stMreq, sizeof (stMreq)); • Multicast IP address (Class-D) is a multicast group ID IP Multicast 2/008

  10. Set TTL Specify the reach of the multicast messages u_long lTTL; lTTL = (u_long)3; // Declare variable TTL // Assign TTL value status = setsockopt (Socket_ID, IPPROTO_IP, IP_MULTICAST_TTL, (char *) &lTTL, sizeof (lTTL)); strcpy (lTTL, “2”); CS 547 Advanced Network Programming IP Multicast 2/009

  11. Disable Loop-back BOOL fFlag; fFlag = FALSE; // Declare variable loop-back Flag // Reset the loop-back flag status = setsockopt (Socket_ID, IPPROTO_IP, IP_MULTICAST_LOOP, (char *) &fFlag, sizeof (fFlag)); CS 547 Advanced Network Programming Loop-back = FALSE -> The Multicast sender will not receiver its message IP Multicast 2/010

  12. Specify Multicast Address CS 547 Advanced Network Programming stDstAddr.sin_family = AF_INET; stDstAddr.sin_addr.s_addr = inet_addr (achMCAddr); stDstAddr.sin_port = htons (nPort); stDstAddr IP Multicast 2/011

  13. Transmit a multicast message status = sendto (Socket_ID, (char *) &stSysTime, sizeof (stSysTime), 0, (struct sockaddr *)&sdDstAddr, sizeof (stDstAddr)); Close socket connection CS 547 Advanced Network Programming status = closesocket (Socket_ID); IP Multicast 2/012

  14. CS 547 Advanced Network Programming Procedures in the client side IP Multicast 2/013

  15. Initialize socket Get a datagram socket CS 547 Advanced Network Programming Same as the server process Same as the server process IP Multicast 2/014

  16. Leave a group Reuse Socket Initialize socket Initialize socket Possible Bind problem Socket() Socket() Set Local Address/Port Problem (Bind Problem) Bind() Bind() SERVER closesocket() recvfrom() sendto() Join a multicast group Join a multicast group Disable Loop-back Set Multicast Address closesocket() Set TTL value CS 547 Advanced Network Programming CLIENT IP Multicast/015

  17. Step 3: Reuse Socket closesocket () only delete this Network Application Operating System Device Driver NW Interface Network Protocol (IP) LLC/MAC Protocol Transport Protocol (TCP/UDP) CS 547 Advanced Network Programming Network IP Multicast 2/016

  18. Three techniques to solve this problem CS 547 Advanced Network Programming (1) Hard disconnection – zero lingering (2) Use different port # for each bind (3) Socket reuse IP Multicast 2/017

  19. closesocket () only delete this Hard Disconnection Network Application Always destroy the connection Network Protocol (IP) LLC/MAC Protocol Transport Protocol (TCP/UDP) CS 547 Advanced Network Programming Network IP Multicast 2/018

  20. Hard Disconnection CS 547 Advanced Network Programming Disadvantage: Part of the last message could be lost IP Multicast 2/019

  21. Leave a group Use different # for each iteration Initialize socket Initialize socket Use different Port number Socket() Socket() Set Local Address/Port Bind() Bind() SERVER closesocket() recvfrom() sendto() Join a multicast group Join a multicast group Disable Loop-back Set Multicast Address closesocket() Set TTL value CS 547 Advanced Network Programming CLIENT IP Multicast/020

  22. Use different # for each iteration CS 547 Advanced Network Programming Disadvantage: One process (program) might consumes many port numbers IP Multicast 2/021

  23. Leave a group Socket Reuse Reuse Socket Initialize socket Initialize socket Possible Bind problem Socket() Socket() Set Local Address/Port Bind() Bind() SERVER closesocket() recvfrom() sendto() Join a multicast group Join a multicast group Disable Loop-back Set Multicast Address closesocket() Set TTL value CS 547 Advanced Network Programming CLIENT IP Multicast/022

  24. Step 3: Socket Reuse Socket ID SOL_SOCKET constant To reuse a socket Pointer to the Boolean variable CS 547 Advanced Network Programming int status = setsockopt (socket_id, SOL_SOCKET, BOOL fFlag; fFlag =FALSE; SO_REUSEADDR, (char *)&fFlag, sizeof (fFlag)); IP Multicast 2/023

  25. Set the local IP address and port number stLclAddr.sin_family = AF_INET; stLclAddr.sin_addr.s_addr = htonl (INADDR_ANY); stLclAddr.sin_port = 0; CS 547 Advanced Network Programming SOCKADDR_IN stLclAddr; IP Multicast 2/024

  26. Bind the socket Byte size of the stLclAddr structure Pointer to stLclAddr structure Socket ID to identify this socket session CS 547 Advanced Network Programming status = bind (socket_ID, (struct sockaddr *) &stLclAddr, sizeof (stLclAddr); IP Multicast 2/025

  27. Join the multicast group CS 547 Advanced Network Programming stMreq.imr_multiaddr.s_addr = (achMCAddr); stMreq.imr_interface.s_addr = INADDR_ANY; status = setsockopt (socket_id, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) &stMreq, sizeof (stMreq)); IP Multicast 2/026

  28. Join the multicast group Assign multicast address strcpy (achMCAddress, “234.5.6.7”); CS 547 Advanced Network Programming structip_mreq stMreq; // Create Multicast interface Structure char achMCAddress[20]; // IP Multicast Address Holder IP Multicast 2/027

  29. Receive a multicast message status = recvfrom (socket_ID, (char *) achInBuf, BUFF_SIZE, 0, (struct sockaddr *)&stSrcAddr, &addr_size); Close socket connection status = closesocket (socket_ID); CS 547 Advanced Network Programming int addr_size = sizeof (stSrcAddr); IP Multicast 2/028

  30. Leaving the multicast group Socket ID IPPROTO_IP constant To drop a multicast group Multicast Interface Structure Size of the structure CS 547 Advanced Network Programming int status = setsockopt (socket_id, IPPPROTO_IP, IP_DROP_MEMBERSHIP, (char *)stMreq, sizeof (stMreq)); IP Multicast 2/029

  31. Leaving the multicast group Specify from which multicast group you are leaving Specify which interface should be removed from the group CS 547 Advanced Network Programming stMreq.imr_multiaddr.s_addr = (achMCAddr); stMreq.imr_interface.s_addr = INADDR_ANY; setsockopt(my_socket, IPPROTO, IP_DROP_MEMBERSHIP, (char *)stMreq, sizeof(stMreq)); IP Multicast 2/030

  32. Close socket connection Clean up winsock object WASCleanup(); status = closesocket (socket_ID); CS 547 Advanced Network Programming IP Multicast 2/031

  33. How to get the current system time (1) ? System Call Declaration CS 547 Advanced Network Programming Server Side SYSTEMTIME stSystemTime; // Hold the current time GetSystemTime (&stSystemTime); // Get the current system time On transmission, you should typecast it to char pointer: (char *) &stSystemTime IP Multicast 2/020

  34. How to get the current system time (2) ? Declaration CS 547 Advanced Network Programming Client Side (1) SYSTEMTIME stSystemTime; // Hold the current time SYSTEMTIME * lpstSysTime; // Pointer of type SYSTIME IP Multicast 2/021

  35. How to get the current system time (3) ? SYSTEMTIME stSystemTime; // Hold the current time SYSTEMTIME * lpstSysTime; // Pointer of type SYSTIME char achInBuff [BUF_SIZE] // Char string for receiving a message • • • • • • • • • • lpstSysTime = (SYSTEMTIME *)achInBuf; • • • • • • • • • • recvfrom (Socket_ID, achInBuf, BUF_SIZE, 0, (struct sockaddr *)&stSrcAddr, &addr_size); • • • • • • • • • • SetSystemTime (lpstSysTime); • • • • • • • • • • GetSystemTime (stSystemTime); • • • • • • • • • • [Display the updated current system time] CS 547 Advanced Network Programming IP Multicast 2/022

  36. How to get the current system time (4) ? printf (“The local time update to %02d-%02d-%02d at %02d-%02d-%02d\n”, stSysTime.wMonth, stSysTime.wDay, stSysTime.wYear, stsSyTime.wHour, stSysTime.wMinute, stSysTime.wSecond, stSysTime.wMillisecond); CS 547 Advanced Network Programming ! Blue Bold - Member variables in stSysTime structure. IP Multicast 2/023

  37. Initialize socket Initialize socket Socket() Socket() ??? Set Local Address/Port Bind() Bind() SERVER closesocket() closesocket() recvfrom() sendto() Join a multicast group Join a multicast group Disable Loop-back Set Multicast Address Set TTL value CS 547 Advanced Network Programming Client and Server Program Structure CLIENT IP Multicast/024

More Related