1 files changed, 52 insertions, 0 deletions
diff --git a/src/shared/resolve-util.c b/src/shared/resolve-util.c
new file mode 100644
index 0000000..820f9bb
--- /dev/null
+++ b/src/shared/resolve-util.c
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "conf-parser.h"
+#include "resolve-util.h"
+#include "string-table.h"
+
+DEFINE_CONFIG_PARSE_ENUM(config_parse_resolve_support, resolve_support, ResolveSupport, "Failed to parse resolve support setting");
+DEFINE_CONFIG_PARSE_ENUM(config_parse_dnssec_mode, dnssec_mode, DnssecMode, "Failed to parse DNSSEC mode setting");
+DEFINE_CONFIG_PARSE_ENUM(config_parse_dns_over_tls_mode, dns_over_tls_mode, DnsOverTlsMode, "Failed to parse DNS-over-TLS mode setting");
+
+static const char* const resolve_support_table[_RESOLVE_SUPPORT_MAX] = {
+        [RESOLVE_SUPPORT_NO] = "no",
+        [RESOLVE_SUPPORT_YES] = "yes",
+        [RESOLVE_SUPPORT_RESOLVE] = "resolve",
+};
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(resolve_support, ResolveSupport, RESOLVE_SUPPORT_YES);
+
+static const char* const dnssec_mode_table[_DNSSEC_MODE_MAX] = {
+        [DNSSEC_NO] = "no",
+        [DNSSEC_ALLOW_DOWNGRADE] = "allow-downgrade",
+        [DNSSEC_YES] = "yes",
+};
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dnssec_mode, DnssecMode, DNSSEC_YES);
+
+static const char* const dns_over_tls_mode_table[_DNS_OVER_TLS_MODE_MAX] = {
+        [DNS_OVER_TLS_NO] = "no",
+        [DNS_OVER_TLS_OPPORTUNISTIC] = "opportunistic",
+        [DNS_OVER_TLS_YES] = "yes",
+};
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dns_over_tls_mode, DnsOverTlsMode, DNS_OVER_TLS_YES);
+
+bool dns_server_address_valid(int family, const union in_addr_union *sa) {
+
+        /* Refuses the 0 IP addresses as well as 127.0.0.53/127.0.0.54 (which is our own DNS stub) */
+
+        if (!in_addr_is_set(family, sa))
+                return false;
+
+        if (family == AF_INET && IN_SET(be32toh(sa->in.s_addr), INADDR_DNS_STUB, INADDR_DNS_PROXY_STUB))
+                return false;
+
+        return true;
+}
+
+DEFINE_CONFIG_PARSE_ENUM(config_parse_dns_cache_mode, dns_cache_mode, DnsCacheMode, "Failed to parse DNS cache mode setting")
+
+static const char* const dns_cache_mode_table[_DNS_CACHE_MODE_MAX] = {
+        [DNS_CACHE_MODE_YES] = "yes",
+        [DNS_CACHE_MODE_NO] = "no",
+        [DNS_CACHE_MODE_NO_NEGATIVE] = "no-negative",
+};
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dns_cache_mode, DnsCacheMode, DNS_CACHE_MODE_YES);