#include "def"
int
main(int argc, char **argv)
{
        int                                     sockfd, n;
        int                       len;
        char                            recvline[1024];
        char                            buff[1024];
        struct sockaddr_in6      servaddr, cliaddr;

        if (argc != 3) {
                perror("usage: a.out <IPaddress>");
                exit(-1);
        }

        if ( (sockfd = socket(AF_INET6, SOCK_STREAM, IPPROTO_SCTP)) < 0){
                perror("socket error");
                exit(-1);
        }

        bzero(&servaddr, sizeof(servaddr));
        servaddr.sin6_family = AF_INET6 ;
        servaddr.sin6_port   = htons(atoi(argv[1]));      /* daytime server */

        if ( inet_pton(AF_INET6, argv[1], &servaddr.sin6_addr) <= 0) {
                perror("inet_pton error for");
                exit(-1);
        }

        if (connect(sockfd, (SA *) &servaddr, sizeof(servaddr)) < 0) {
                perror("connect error");
                exit(-1);
        }
   write(sockfd,"HI",2);

        len = sizeof(cliaddr);
        getsockname(sockfd, (SA *) &cliaddr, &len);
        printf("my end: %s, port %d\n",
          inet_ntop(AF_INET6, &cliaddr.sin6_addr, buff, sizeof(buff)),
          ntohs(cliaddr.sin6_port));

/*
        write(sockfd,"HI",2);
*/


        len = sizeof(cliaddr);
        getpeername(sockfd, (SA *) &cliaddr, &len);
        printf("my peer: %s, port %d\n",
          inet_ntop(AF_INET6, &cliaddr.sin6_addr, buff, sizeof(buff)),
          ntohs(cliaddr.sin6_port));



        while ( (n = read(sockfd, recvline, 1024)) > 0) {
                recvline[n] = 0;        /* null terminate */
                if (fputs(recvline, stdout) == EOF) {
                        perror("fputs error");
                        exit(-1);
                }
        }
        if (n < 0){
                perror("read error");
                exit(-1);
        }

        exit(0);
}