I am trying to work on IPv6 multicast. I just wrote a small programme to test but get stuck somewhere. I wonder if someone could be of help.
Many thanks in advance!! fuhua
This is a client to send data from keyboard to group ff3e::2222/1234.
-------
#include <netinet/in.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char **argv){ int mysock;
struct sockaddr_in6 servaddr6, cliaddr6;
struct ipv6_mreq mreq6; int loop=0;
int hops=127;
int ifindex; int servlen;
int n;
char sendline[1024], recvline[1025]; mysock=socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
ifindex=if_nametoindex("eth0"); bzero(&servaddr6, sizeof(servaddr6));
servaddr6.sin6_family=AF_INET6;
servaddr6.sin6_port=htons(1234);
inet_pton(AF_INET6, "ff3e::2222", &servaddr6.sin6_addr); if(!IN6_IS_ADDR_MULTICAST(&servaddr6.sin6_addr)){
int main(int argc, char **argv){ int mysock;
struct sockaddr_in6 servaddr6, cliaddr6;
struct ipv6_mreq mreq6; int loop=0;
int hops=127;
int ifindex; int servlen;
int servlen;
int n;
char sendline[1024], recvline[1025]; mysock=socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
ifindex=if_nametoindex("eth0"); bzero(&servaddr6, sizeof(servaddr6));
servaddr6.sin6_family=AF_INET6;
servaddr6.sin6_port=htons(1234);
inet_pton(AF_INET6, "ff3e::2222", &servaddr6.sin6_addr);if(!IN6_IS_ADDR_MULTICAST(&servaddr6.sin6_addr)){
printf(" is not multicast ip6 address \n");
exit(1);
}bzero(&cliaddr6, sizeof(cliaddr6));
cliaddr6.sin6_family=AF_INET6;
cliaddr6.sin6_port=htons(0);
inet_pton(AF_INET6, "2001:6a8:1080:102:203:47ff:fe69:ab93", &cliaddr6.sin6_addr);
bind(mysock, (struct sockaddr*)& cliaddr6,sizeof(cliaddr6));
setsockopt(mysock, IPPROTO_IPV6, IPV6_MULTICAST_IF, &ifindex,sizeof(ifindex));
setsockopt(mysock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof(loop));
setsockopt(mysock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hops, sizeof(hops));
while (fgets(sendline, 1024,stdin)!=NULL){
sendto(mysock, sendline, strlen(sendline),0, (struct sockaddr*)&servaddr6,sizeof(servaddr6));
printf("fuhua check\n");
fputs(sendline,stdout);
} return 0;
} -----------------------
This is the server to receive the message and print on screen.
--
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <unistd.h>
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char **argv){int mysock; struct sockaddr_in6 myaddr, cliaddr; char msgbuf[1024]; int clilen; int msglen; mysock=socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); memset(&myaddr,0, sizeof(myaddr)); myaddr.sin6_family=AF_INET6; myaddr.sin6_port=htons(1234); inet_pton(AF_INET6,"2001:6a8:1080:102::d",&myaddr.sin6_addr);
printf("ssss \n");
mysock=socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
bind(mysock, (struct sockaddr*) &myaddr, sizeof(myaddr));
for ( ; ; )
{printf("fuhua yin----ssss \n");
clilen=sizeof(cliaddr);
msglen=recvfrom(mysock, msgbuf, 1024, 0, (struct sockaddr*)&cliaddr, &clilen);
printf("how many bytes I receive from client %d",msglen);
sendto(mysock, msgbuf,msglen, 0, (struct sockaddr*)&cliaddr, clilen);
}
return 0;
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