+#ifndef OPENSSL_NO_NPN
+ else if (type == TLSEXT_TYPE_next_proto_neg)
+ {
+ unsigned char *selected;
+ unsigned char selected_len;
+
+ /* We must have requested it. */
+ if ((s->ctx->next_proto_select_cb == NULL))
+ {
+ *al = TLS1_AD_UNSUPPORTED_EXTENSION;
+ return 0;
+ }
+ /* The data must be valid */
+ if (!ssl_next_proto_validate(data, size))
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ s->next_proto_negotiated = OPENSSL_malloc(selected_len);
+ if (!s->next_proto_negotiated)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ memcpy(s->next_proto_negotiated, selected, selected_len);
+ s->next_proto_negotiated_len = selected_len;
+ }
+#endif