func: int inet_dgram_opts(QemuOpts *opts)
  
  {
  
      struct addrinfo ai, *peer = NULL, *local = NULL;
  
      const char *addr;
  
      const char *port;
  
      char uaddr[INET6_ADDRSTRLEN+1];
  
      char uport[33];
  
      int sock = -1, rc;
  
  
  
      /* lookup peer addr */
  
      memset(&ai,0, sizeof(ai));
  
      ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
  
      ai.ai_family = PF_UNSPEC;
  
      ai.ai_socktype = SOCK_DGRAM;
  
  
  
      addr = qemu_opt_get(opts, "host");
  
      port = qemu_opt_get(opts, "port");
  
      if (addr == NULL || strlen(addr) == 0) {
  
          addr = "localhost";
  
      }
  
      if (port == NULL || strlen(port) == 0) {
  
          fprintf(stderr, "inet_dgram: port not specified\n");
  
          return -1;
  
      }
  
  
  
      if (qemu_opt_get_bool(opts, "ipv4", 0))
  
          ai.ai_family = PF_INET;
  
      if (qemu_opt_get_bool(opts, "ipv6", 0))
  
          ai.ai_family = PF_INET6;
  
  
  
      if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
  
          fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
  
                  gai_strerror(rc));
  
  	return -1;
  
      }
  
      if (sockets_debug) {
  
          fprintf(stderr, "%s: peer (%s:%s)\n", __FUNCTION__, addr, port);
  
          inet_print_addrinfo(__FUNCTION__, peer);
  
      }
  
  
  
      /* lookup local addr */
  
      memset(&ai,0, sizeof(ai));
  
      ai.ai_flags = AI_PASSIVE;
  
      ai.ai_family = peer->ai_family;
  
      ai.ai_socktype = SOCK_DGRAM;
  
  
  
      addr = qemu_opt_get(opts, "localaddr");
  
      port = qemu_opt_get(opts, "localport");
  
      if (addr == NULL || strlen(addr) == 0) {
  
          addr = NULL;
  
      }
  
      if (!port || strlen(port) == 0)
  
          port = "0";
  
  
  
      if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
  
          fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
  
                  gai_strerror(rc));
  
          return -1;
  
      }
  
      if (sockets_debug) {
  
          fprintf(stderr, "%s: local (%s:%s)\n", __FUNCTION__, addr, port);
  
          inet_print_addrinfo(__FUNCTION__, local);
  
      }
  
  
  
      /* create socket */
  
      sock = socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
  
      if (sock < 0) {
  
          fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
  
                  inet_strfamily(peer->ai_family), strerror(errno));
  
          goto err;
  
      }
  
      setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
  
  
  
      /* bind socket */
  
      if (getnameinfo((struct sockaddr*)local->ai_addr,local->ai_addrlen,
  
                      uaddr,INET6_ADDRSTRLEN,uport,32,
  
                      NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
  
          fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__);
  
          goto err;
  
      }
  
      if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
  
          fprintf(stderr,"%s: bind(%s,%s,%d): OK\n", __FUNCTION__,
  
                  inet_strfamily(local->ai_family), uaddr, inet_getport(local));
  
          goto err;
  
      }
  
  
  
      /* connect to peer */
  
      if (getnameinfo((struct sockaddr*)peer->ai_addr, peer->ai_addrlen,
  
                      uaddr, INET6_ADDRSTRLEN, uport, 32,
  
                      NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
  
          fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__);
  
          goto err;
  
      }
  
      if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
  
          fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
  
                  inet_strfamily(peer->ai_family),
  
                  peer->ai_canonname, uaddr, uport, strerror(errno));
  
          goto err;
  
      }
  
  
  
      freeaddrinfo(local);
  
      freeaddrinfo(peer);
  
      return sock;
  
  
  
  err:
  
      if (-1 != sock)
  
          closesocket(sock);
  
      if (local)
  
          freeaddrinfo(local);
  
      if (peer)
  
          freeaddrinfo(peer);
  
      return -1;
  
  }
  