fix: build v1.31 (#105)

Signed-off-by: Mike Beaumont <[email protected]>

patches/v1.31-0001-dns-don-t-error-if-header-id-is-0.patch

@@ -0,0 +1,27 @@
+From db432303b88ef5197ad6ed330a15173bf7967e1d Mon Sep 17 00:00:00 2001
+From: Mike Beaumont <[email protected]>
+Date: Tue, 9 Jul 2024 10:14:29 +0200
+Subject: [PATCH] dns: don't error if header id is 0
+
+---
+ source/extensions/filters/udp/dns_filter/dns_parser.cc | 4 ----
+ 1 file changed, 4 deletions(-)
+
+diff --git a/source/extensions/filters/udp/dns_filter/dns_parser.cc b/source/extensions/filters/udp/dns_filter/dns_parser.cc
+index b63f69278d..9be5917d9b 100644
+--- a/source/extensions/filters/udp/dns_filter/dns_parser.cc
++++ b/source/extensions/filters/udp/dns_filter/dns_parser.cc
+@@ -212,10 +212,6 @@ bool DnsMessageParser::parseDnsObject(DnsQueryContextPtr& context,
+   }
+
+   context->id_ = static_cast<uint16_t>(context->header_.id);
+-  if (context->id_ == 0) {
+-    ENVOY_LOG(debug, "No ID in DNS query");
+-    return false;
+-  }
+
+   // Almost always, we will have only one query here. Per the RFC, QDCOUNT is usually 1
+   context->queries_.reserve(context->header_.questions);
+-- 
+2.45.2
+

scripts/fetch_sources.sh

@@ -15,6 +15,7 @@ patches_per_version[v1.27]="$(realpath "patches/v1.27-0001-dns-don-t-error-if-he
 patches_per_version[v1.28]="$(realpath "patches/v1.28-0001-dns-don-t-error-if-header-id-is-0.patch")"
 patches_per_version[v1.29]="$(realpath "patches/v1.29-0001-dns-don-t-error-if-header-id-is-0.patch")"
 patches_per_version[v1.30]="$(realpath "patches/v1.30-0001-dns-don-t-error-if-header-id-is-0.patch")"
+patches_per_version[v1.31]="$(realpath "patches/v1.31-0001-dns-don-t-error-if-header-id-is-0.patch")"
 
 PATCH_FILES_1_26=(
   "$(realpath "scripts/dns_filter_resolver.h.patch")"