Pad queries when EDNS0 is enabled.
Behavior is compliant with
https://tools.ietf.org/html/draft-ietf-dprive-padding-policy-04
EDNS0 is only enabled when the netcontext requests it, i.e. in DNS-over-TLS
mode.
Bug: 69623036
Bug: 64133961
Test: Wireshark verified. Integration tests echo padding and pass.
Change-Id: I5ef600e02a572d281441e890cc981614f150629b
diff --git a/libc/dns/include/resolv_params.h b/libc/dns/include/resolv_params.h
index 1b9d433..3c07d8a 100644
--- a/libc/dns/include/resolv_params.h
+++ b/libc/dns/include/resolv_params.h
@@ -34,6 +34,10 @@
* servers.
*/
+/* If EDNS0_PADDING is defined, queries will be padded to a multiple of this length
+when EDNS0 is active. */
+#define EDNS0_PADDING 128
+
/* per-netid configuration parameters passed from netd to the resolver */
struct __res_params {
uint16_t sample_validity; // sample lifetime in s