IPv6-based multicast communication

Client:

// Client # include <winsock2.h> # include <stdio. h> # include <stdlib. h> # include <ws2tcpip. h> // # include "tp1_6.h" # include <iostream> # pragma comment (Lib, "ws2_32.lib") using namespace STD; # define hello_port 7905 // defines the port # define hello_group "ff02 :: 99 "//" 224.0.0.99 "//" 228.4.5.6 "// defines the multicast target address 224.0.1.0-238.255.255.255 # define buffer_size 1024 // The client must be added to the multicast group, and receive data packets in real time int main () {cout <"this is client who join to some MUL Ticast group and receive data from Multicast Source! "<Endl; wsadata WD; wsastartup (makeword (2, 2), & WD); int err =-1; // socket s; addrinfo hints; addrinfo * res = NULL; memset (& hints, 0, sizeof (hints); // hints. ai_family = pf_unspec; hints. ai_family = af_inet6; hints. ai_socktype = sock_dgram; hints. ai_protocol = ipproto_udp; // you can change the value to 0 here to enable the system to select hints. ai_flags = ai_numerichost; int rc = getaddrinfo (pcstr) "fe80: 6820: ef2d: fece: 9fb6", "6000", & hints, & res ); // parse the recipient's receiving address if (RC! = 0) {printf ("getaddrinfo fail \ n"); Return 0;} socket sockclt = socket (res-> ai_family, res-> ai_socktype, res-> ai_protocol ); /**************************/int ret; const int on = 1; // allow multiple instances of the program to run on the same machine ret = setsockopt (sockclt, sol_socket, so_reuseaddr, (char *) & on, sizeof (on); If (ret = socket_error) {wsacleanup (); cout <"error in setsockopt (so_reuseaddr):" <wsagetlasterror () <Endl; return 0;} // set The number of multicast hops should actually be placed on the sending end .. Const int routenum = 10; ret = setsockopt (sockclt, ipproto_ipv6, ipv6_multicast_hops, \ (char *) & routenum, sizeof (routenum); If (ret = socket_error) {wsacleanup (); cout <"error in setsockopt (ip_multicast_ttl):" <wsagetlasterror () <Endl; return 0 ;} /************************* // char WHT [80 ]; /* bind socket */ret = BIND (sockclt, res-> ai_addr, res-> ai_addrlen); // bind the port // cout <inet_ntop (af_inet6, (void *) (Re S-> ai_addr), WHT, 80) <Endl; If (socket_error = RET) {printf ("socket_error \ n"); Return 0;} struct defaults 6_mreq mreq6; /* join Broadcast Group */inet_ton (af_inet6, hello_group, & mreq6.1096mr _ multiaddr); mreq6.1096mr _ multiaddr. u. byte; For (INT I = 0; I <16; I ++) {printf ("% x", mreq6.1096mr _ multiaddr. u. byte [I]); // cout <mreq6.1096mr _ multiaddr. u. byte [I] <Endl;} mreq6.20.6mr _ interface = htonl (inaddr_any);/* the network interface is default * // * Add the local machine to the Broadcast Group */err = setso Ckopt (sockclt, ipproto_ipv6, scheme, (char *) & mreq6, sizeof (mreq6); If (ERR <0) {perror ("setsockopt (): Limit 6_add_membership "); return-4;} Char Buf [buffer_size + 1]; // read the content buffer pool char SRC [50]; // int ret; // read the content size sockaddr_storage SA; int iaddrlen = sizeof (SA); // The length is only 24 characters long and not long enough. So we need to change it to 32. The actual receipt is 28 :( zeromemory (& SA, sizeof (SA); While (1) {// sleep (10000 ); // clientlen = sizeof (client); // memset (& client, 0, clientlen); memset (SRC, 0, sizeof (SRC )); // cout <"can receive? "<Endl; ret = recvfrom (sockclt, Buf, sizeof (BUF), 0, (struct sockaddr *) & SA, & iaddrlen); cout <RET <Endl; if (ret = 0) // do_read sends an empty string {continue;} else if (ret = socket_error) {If (wsagetlasterror () = wsaeintr) // The error break returned by the primary thread to terminate recvfrom; cout <"error in recvfrom:" <wsagetlasterror () <Endl; // break ;} buf [RET] = '\ 0'; cout <"recieve from:" <inet_ntop (af_inet6, (void *) & SA, SRC, 50) <Endl; cout <"Received:" <Buf <Endl; cout <"----------------" <Endl ;}}

Server:

// Server # include <winsock2.h> # include <stdio. h> # include <ws2tcpip. h> // # include "tp1_6.h" # include <iostream> # pragma comment (Lib, "ws2_32.lib") using namespace STD; # define hello_port 7905 // defines the port # define hello_group "ff02: 99" // defines the user multicast address in the Link range # define buffer_size 1024int main () {cout <"IPv6: This is server for sending data to multicast address! "<Endl; wsadata WD; wsastartup (makeword (2, 2), & WD); char sendline [buffer_size + 1]; // socket s; addrinfo hints; addrinfo * res = NULL; memset (& hints, 0, sizeof (hints); // hints. ai_family = pf_unspec; hints. ai_family = af_inet6; hints. ai_socktype = sock_dgram; hints. ai_protocol = ipproto_udp; // you can change the value to 0 here to enable the system to select hints. ai_flags = ai_numerichost; int rc = getaddrinfo (pcstr) hello_group, "6000", & hints, & res); // parse the recipient's receiving address if (RC! = 0) {printf ("getaddrinfo fail \ n"); Return 0;} socket sockclt = socket (res-> ai_family, res-> ai_socktype, res-> ai_protocol ); // char WHT [80]; // cout <res-> ai_addr-> sa_data [15] <Endl; // cout <inet_ntop (af_inet6, (void *) (res-> ai_addr), WHT, 80) <Endl; while (1) {cin. getline (sendline, buffer_size); If (strncmp (sendline, "end", 3) = 0) break; sendto (sockclt, sendline, strlen (sendline), 0, res-> ai_addr, res-> ai_addrlen);} return 0 ;}