#include "def"
#define MAXIDLETIME     1

main(argc, argv )
int argc;
char *argv[];

{
   int   sd;
   struct   sockaddr_in6  DTserver;
   char buff[1024];
   struct sockaddr_in6 cliaddr;
   struct   hostent *hp, *gethostbyname();
   int len;
   int n;
   int i;
   fd_set  rset;



   sd = socket (AF_INET6,SOCK_SEQPACKET,IPPROTO_SCTP);

   i = MAXIDLETIME;
   setsockopt(sd, IPPROTO_SCTP, SCTP_AUTOCLOSE, &i, sizeof (i)) ;
   listen(sd, 1);


   DTserver.sin6_family = AF_INET6;
   if ( inet_pton(AF_INET6, argv[1], &DTserver.sin6_addr) <= 0) {
                perror("inet_pton error");
                exit(-1);
   }
   DTserver.sin6_port = htons(atoi(argv[1]));

   len = sizeof(DTserver);
   sendto(sd, "HI", 3, 0, (SA *) &DTserver, len);

   listen(sd, 1);
      len = sizeof(cliaddr);
      n = recvfrom (sd, buff, sizeof(buff), 0, (SA *) &cliaddr, &len);
      buff[n] = NULL;
      printf("got %s\n", buff);
      printf("from %s, port %d\n",
          inet_ntop(AF_INET6, &cliaddr.sin6_addr, buff, sizeof(buff)), 
          ntohs(cliaddr.sin6_port));
}