src/shared/resolve-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include "conf-parser.h"
   4 #include "in-addr-util.h"
   5 #include "resolve-util.h"
   6 #include "string-table.h"
   7
   8 DEFINE_CONFIG_PARSE_ENUM(config_parse_resolve_support, resolve_support, ResolveSupport);
   9 DEFINE_CONFIG_PARSE_ENUM(config_parse_dnssec_mode, dnssec_mode, DnssecMode);
  10 DEFINE_CONFIG_PARSE_ENUM(config_parse_dns_over_tls_mode, dns_over_tls_mode, DnsOverTlsMode);
  11
  12 static const char* const resolve_support_table[_RESOLVE_SUPPORT_MAX] = {
  13         [RESOLVE_SUPPORT_NO] = "no",
  14         [RESOLVE_SUPPORT_YES] = "yes",
  15         [RESOLVE_SUPPORT_RESOLVE] = "resolve",
  16 };
  17 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(resolve_support, ResolveSupport, RESOLVE_SUPPORT_YES);
  18
  19 static const char* const dnssec_mode_table[_DNSSEC_MODE_MAX] = {
  20         [DNSSEC_NO] = "no",
  21         [DNSSEC_ALLOW_DOWNGRADE] = "allow-downgrade",
  22         [DNSSEC_YES] = "yes",
  23 };
  24 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dnssec_mode, DnssecMode, DNSSEC_YES);
  25
  26 static const char* const dns_over_tls_mode_table[_DNS_OVER_TLS_MODE_MAX] = {
  27         [DNS_OVER_TLS_NO] = "no",
  28         [DNS_OVER_TLS_OPPORTUNISTIC] = "opportunistic",
  29         [DNS_OVER_TLS_YES] = "yes",
  30 };
  31 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dns_over_tls_mode, DnsOverTlsMode, DNS_OVER_TLS_YES);
  32
  33 bool dns_server_address_valid(int family, const union in_addr_union *sa) {
  34
  35         /* Refuses the 0 IP addresses as well as 127.0.0.53/127.0.0.54 (which is our own DNS stub) */
  36
  37         if (!in_addr_is_set(family, sa))
  38                 return false;
  39
  40         if (family == AF_INET && IN_SET(be32toh(sa->in.s_addr), INADDR_DNS_STUB, INADDR_DNS_PROXY_STUB))
  41                 return false;
  42
  43         return true;
  44 }
  45
  46 DEFINE_CONFIG_PARSE_ENUM(config_parse_dns_cache_mode, dns_cache_mode, DnsCacheMode);
  47
  48 static const char* const dns_cache_mode_table[_DNS_CACHE_MODE_MAX] = {
  49         [DNS_CACHE_MODE_YES] = "yes",
  50         [DNS_CACHE_MODE_NO] = "no",
  51         [DNS_CACHE_MODE_NO_NEGATIVE] = "no-negative",
  52 };
  53 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dns_cache_mode, DnsCacheMode, DNS_CACHE_MODE_YES);