From: W.C.A. Wijngaards <wouter@nlnetlabs.nl>
Date: Wed, 3 Jun 2026 12:21:06 +0000 (+0200)
Subject: * Fix to parse SVCB and HTTPS svcparam ech=0.
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a65a37415379727a2f7435d4a22e6b63cf04e1ad;p=thirdparty%2Fldns.git

* Fix to parse SVCB and HTTPS svcparam ech=0.
---

diff --git a/Changelog b/Changelog
index b32d92ac..841052c2 100644
--- a/Changelog
+++ b/Changelog
@@ -8,6 +8,7 @@
 	  presentation format in ldns_pkt2str_fmt. Thanks Peter Kästle
 	* The -O option to calculate (and sign) only the ZONEMD an input
 	  zone with ldns-signzone
+	* Fix to parse SVCB and HTTPS svcparam ech=0.
 	
 1.9.0	2025-12-04
 	* PR #246: Make ldns_calc_keytag() available for CDNSKEY RR
diff --git a/str2host.c b/str2host.c
index 8a325921..f497bd8b 100644
--- a/str2host.c
+++ b/str2host.c
@@ -2153,6 +2153,11 @@ parse_svcparam_ech(const char **s, uint8_t **dp, uint8_t *eod)
 		*s += 1;
 		quoted = true;
 	}
+	if(**s == '0' && *(*s+1) == 0) {
+		/* single 0 represents empty buffer */
+		*s += 1;
+		return LDNS_STATUS_OK;
+	}
 	b64_str = *s;
 	while (isalnum((unsigned char)**s) || **s == '+'
 	                                   || **s == '/'