+#ifdef ENABLE_IPV6
+static int
+getfamily (int fd)
+{
+ struct sockaddr_storage ss;
+ struct sockaddr *sa = (struct sockaddr *)&ss;
+ socklen_t len = sizeof (ss);
+
+ assert (fd >= 0);
+
+ if (getpeername (fd, sa, &len) < 0)
+ /* Mauro Tortonesi: HOW DO WE HANDLE THIS ERROR? */
+ abort ();
+
+ return sa->sa_family;
+}
+
+/*
+ * This function sets up a passive data connection with the FTP server.
+ * It is merely a wrapper around ftp_epsv, ftp_lpsv and ftp_pasv.
+ */
+static uerr_t
+ftp_do_pasv (struct rbuf *rbuf, ip_address *addr, unsigned short *port)
+{
+ uerr_t err;
+ int family;
+
+ family = getfamily (rbuf->fd);
+ assert (family == AF_INET || family == AF_INET6);
+
+ /* If our control connection is over IPv6, then we first try EPSV and then
+ * LPSV if the former is not supported. If the control connection is over
+ * IPv4, we simply issue the good old PASV request. */
+ if (family == AF_INET6)
+ {
+ if (!opt.server_response)
+ logputs (LOG_VERBOSE, "==> EPSV ... ");
+ err = ftp_epsv (rbuf, addr, port);
+
+ /* If EPSV is not supported try LPSV */
+ if (err == FTPNOPASV)
+ {
+ if (!opt.server_response)
+ logputs (LOG_VERBOSE, "==> LPSV ... ");
+ err = ftp_lpsv (rbuf, addr, port);
+ }
+ }
+ else
+ {
+ if (!opt.server_response)
+ logputs (LOG_VERBOSE, "==> PASV ... ");
+ err = ftp_pasv (rbuf, addr, port);
+ }
+
+ return err;
+}
+
+/*
+ * This function sets up an active data connection with the FTP server.
+ * It is merely a wrapper around ftp_eprt, ftp_lprt and ftp_port.
+ */
+static uerr_t
+ftp_do_port (struct rbuf *rbuf)
+{
+ uerr_t err;
+ int family;
+
+ assert (rbuf != NULL);
+ assert (rbuf_initialized_p (rbuf));
+
+ family = getfamily (rbuf->fd);
+ assert (family == AF_INET || family == AF_INET6);
+
+ /* If our control connection is over IPv6, then we first try EPRT and then
+ * LPRT if the former is not supported. If the control connection is over
+ * IPv4, we simply issue the good old PORT request. */
+ if (family == AF_INET6)
+ {
+ if (!opt.server_response)
+ logputs (LOG_VERBOSE, "==> EPRT ... ");
+ err = ftp_eprt (rbuf);
+
+ /* If EPRT is not supported try LPRT */
+ if (err == FTPPORTERR)
+ {
+ if (!opt.server_response)
+ logputs (LOG_VERBOSE, "==> LPRT ... ");
+ err = ftp_lprt (rbuf);
+ }
+ }
+ else
+ {
+ if (!opt.server_response)
+ logputs (LOG_VERBOSE, "==> PORT ... ");
+ err = ftp_port (rbuf);
+ }
+
+ return err;
+}
+#else
+#define ftp_do_pasv ftp_pasv
+#define ftp_do_port ftp_port
+#endif
+