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-rw-r--r--imap-send.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/imap-send.c b/imap-send.c
index 43ac4e0bdf..d9bcfb44dc 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -304,6 +304,17 @@ static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int ve
return -1;
}
+#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
+ /*
+ * SNI (RFC4366)
+ * OpenSSL does not document this function, but the implementation
+ * returns 1 on success, 0 on failure after calling SSLerr().
+ */
+ ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
+ if (ret != 1)
+ warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
+#endif
+
ret = SSL_connect(sock->ssl);
if (ret <= 0) {
socket_perror("SSL_connect", sock, ret);