src/resolve/resolved-conf.c - systemd-stable - Rivoreo Source Code Repositories

 /* SPDX-License-Identifier: LGPL-2.1+ */

 #include "alloc-util.h"
 #include "conf-parser.h"
 #include "def.h"
 #include "extract-word.h"
 #include "hexdecoct.h"
 #include "parse-util.h"
 #include "resolved-conf.h"
 #include "resolved-dnssd.h"
 #include "specifier.h"
 #include "string-table.h"
 #include "string-util.h"
 #include "utf8.h"

 DEFINE_CONFIG_PARSE_ENUM(config_parse_dns_stub_listener_mode, dns_stub_listener_mode, DnsStubListenerMode, "Failed to parse DNS stub listener mode setting");

 static const char* const dns_stub_listener_mode_table[_DNS_STUB_LISTENER_MODE_MAX] = {
         [DNS_STUB_LISTENER_NO] = "no",
         [DNS_STUB_LISTENER_UDP] = "udp",
         [DNS_STUB_LISTENER_TCP] = "tcp",
         [DNS_STUB_LISTENER_YES] = "yes",
 };
 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dns_stub_listener_mode, DnsStubListenerMode, DNS_STUB_LISTENER_YES);

 static int manager_add_dns_server_by_string(Manager *m, DnsServerType type, const char *word) {
         union in_addr_union address;
         int family, r, ifindex = 0;
         DnsServer *s;

         assert(m);
         assert(word);

         r = in_addr_ifindex_from_string_auto(word, &family, &address, &ifindex);
         if (r < 0)
                 return r;

         /* Silently filter out 0.0.0.0 and 127.0.0.53 (our own stub DNS listener) */
         if (!dns_server_address_valid(family, &address))
                 return 0;

         /* Filter out duplicates */
         s = dns_server_find(manager_get_first_dns_server(m, type), family, &address, ifindex);
         if (s) {
                 /*
                  * Drop the marker. This is used to find the servers
                  * that ceased to exist, see
                  * manager_mark_dns_servers() and
                  * manager_flush_marked_dns_servers().
                  */
                 dns_server_move_back_and_unmark(s);
                 return 0;
         }

         return dns_server_new(m, NULL, type, NULL, family, &address, ifindex);
 }

 int manager_parse_dns_server_string_and_warn(Manager *m, DnsServerType type, const char *string) {
         int r;

         assert(m);
         assert(string);

         for (;;) {
                 _cleanup_free_ char *word = NULL;

                 r = extract_first_word(&string, &word, NULL, 0);
                 if (r < 0)
                         return r;
                 if (r == 0)
                         break;

                 r = manager_add_dns_server_by_string(m, type, word);
                 if (r < 0)
                         log_warning_errno(r, "Failed to add DNS server address '%s', ignoring: %m", word);
         }

         return 0;
 }

 static int manager_add_search_domain_by_string(Manager *m, const char *domain) {
         DnsSearchDomain *d;
         bool route_only;
         int r;

         assert(m);
         assert(domain);

         route_only = *domain == '~';
         if (route_only)
                 domain++;

         if (dns_name_is_root(domain) || streq(domain, "*")) {
                 route_only = true;
                 domain = ".";
         }

         r = dns_search_domain_find(m->search_domains, domain, &d);
         if (r < 0)
                 return r;
         if (r > 0)
                 dns_search_domain_move_back_and_unmark(d);
         else {
                 r = dns_search_domain_new(m, &d, DNS_SEARCH_DOMAIN_SYSTEM, NULL, domain);
                 if (r < 0)
                         return r;
         }

         d->route_only = route_only;
         return 0;
 }

 int manager_parse_search_domains_and_warn(Manager *m, const char *string) {
         int r;

         assert(m);
         assert(string);

         for (;;) {
                 _cleanup_free_ char *word = NULL;

                 r = extract_first_word(&string, &word, NULL, EXTRACT_UNQUOTE);
                 if (r < 0)
                         return r;
                 if (r == 0)
                         break;

                 r = manager_add_search_domain_by_string(m, word);
                 if (r < 0)
                         log_warning_errno(r, "Failed to add search domain '%s', ignoring: %m", word);
         }

         return 0;
 }

 int config_parse_dns_servers(
                 const char *unit,
                 const char *filename,
                 unsigned line,
                 const char *section,
                 unsigned section_line,
                 const char *lvalue,
                 int ltype,
                 const char *rvalue,
                 void *data,
                 void *userdata) {

         Manager *m = userdata;
         int r;

         assert(filename);
         assert(lvalue);
         assert(rvalue);
         assert(m);

         if (isempty(rvalue))
                 /* Empty assignment means clear the list */
                 dns_server_unlink_all(manager_get_first_dns_server(m, ltype));
         else {
                 /* Otherwise, add to the list */
                 r = manager_parse_dns_server_string_and_warn(m, ltype, rvalue);
                 if (r < 0) {
                         log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse DNS server string '%s'. Ignoring.", rvalue);
                         return 0;
                 }
         }

         /* If we have a manual setting, then we stop reading
          * /etc/resolv.conf */
         if (ltype == DNS_SERVER_SYSTEM)
                 m->read_resolv_conf = false;
         if (ltype == DNS_SERVER_FALLBACK)
                 m->need_builtin_fallbacks = false;

         return 0;
 }

 int config_parse_search_domains(
                 const char *unit,
                 const char *filename,
                 unsigned line,
                 const char *section,
                 unsigned section_line,
                 const char *lvalue,
                 int ltype,
                 const char *rvalue,
                 void *data,
                 void *userdata) {

         Manager *m = userdata;
         int r;

         assert(filename);
         assert(lvalue);
         assert(rvalue);
         assert(m);

         if (isempty(rvalue))
                 /* Empty assignment means clear the list */
                 dns_search_domain_unlink_all(m->search_domains);
         else {
                 /* Otherwise, add to the list */
                 r = manager_parse_search_domains_and_warn(m, rvalue);
                 if (r < 0) {
                         log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse search domains string '%s'. Ignoring.", rvalue);
                         return 0;
                 }
         }

         /* If we have a manual setting, then we stop reading
          * /etc/resolv.conf */
         m->read_resolv_conf = false;

         return 0;
 }

 int config_parse_dnssd_service_name(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) {
         static const Specifier specifier_table[] = {
                 { 'b', specifier_boot_id,         NULL },
                 { 'H', specifier_host_name,       NULL },
                 { 'm', specifier_machine_id,      NULL },
                 { 'v', specifier_kernel_release,  NULL },
                 {}
         };
         DnssdService *s = userdata;
         _cleanup_free_ char *name = NULL;
         int r;

         assert(filename);
         assert(lvalue);
         assert(rvalue);
         assert(s);

         if (isempty(rvalue)) {
                 log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name can't be empty. Ignoring.");
                 return -EINVAL;
         }

         r = free_and_strdup(&s->name_template, rvalue);
         if (r < 0)
                 return log_oom();

         r = specifier_printf(s->name_template, specifier_table, NULL, &name);
         if (r < 0)
                 return log_debug_errno(r, "Failed to replace specifiers: %m");

         if (!dns_service_name_is_valid(name)) {
                 log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name template renders to invalid name '%s'. Ignoring.", name);
                 return -EINVAL;
         }

         return 0;
 }

 int config_parse_dnssd_service_type(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) {
         DnssdService *s = userdata;
         int r;

         assert(filename);
         assert(lvalue);
         assert(rvalue);
         assert(s);

         if (isempty(rvalue)) {
                 log_syntax(unit, LOG_ERR, filename, line, 0, "Service type can't be empty. Ignoring.");
                 return -EINVAL;
         }

         if (!dnssd_srv_type_is_valid(rvalue)) {
                 log_syntax(unit, LOG_ERR, filename, line, 0, "Service type is invalid. Ignoring.");
                 return -EINVAL;
         }

         r = free_and_strdup(&s->type, rvalue);
         if (r < 0)
                 return log_oom();

         return 0;
 }

 int config_parse_dnssd_txt(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) {
         _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
         DnssdService *s = userdata;
         DnsTxtItem *last = NULL;

         assert(filename);
         assert(lvalue);
         assert(rvalue);
         assert(s);

         if (isempty(rvalue)) {
                 /* Flush out collected items */
                 s->txt_data_items = dnssd_txtdata_free_all(s->txt_data_items);
                 return 0;
         }

         txt_data = new0(DnssdTxtData, 1);
         if (!txt_data)
                 return log_oom();

         for (;;) {
                 _cleanup_free_ char *word = NULL;
                 _cleanup_free_ char *key = NULL;
                 _cleanup_free_ char *value = NULL;
                 _cleanup_free_ void *decoded = NULL;
                 size_t length = 0;
                 DnsTxtItem *i;
                 int r;

                 r = extract_first_word(&rvalue, &word, NULL,
                                        EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE|EXTRACT_CUNESCAPE_RELAX);
                 if (r == 0)
                         break;
                 if (r == -ENOMEM)
                         return log_oom();
                 if (r < 0)
                         return log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);

                 r = split_pair(word, "=", &key, &value);
                 if (r == -ENOMEM)
                         return log_oom();
                 if (r == -EINVAL)
                         key = TAKE_PTR(word);

                 if (!ascii_is_valid(key)) {
                         log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid syntax, ignoring: %s", key);
                         return -EINVAL;
                 }

                 switch (ltype) {

                 case DNS_TXT_ITEM_DATA:
                         if (value) {
                                 r = unbase64mem(value, strlen(value), &decoded, &length);
                                 if (r == -ENOMEM)
                                         return log_oom();
                                 if (r < 0)
                                         return log_syntax(unit, LOG_ERR, filename, line, r,
                                                           "Invalid base64 encoding, ignoring: %s", value);
                         }

                         r = dnssd_txt_item_new_from_data(key, decoded, length, &i);
                         if (r < 0)
                                 return log_oom();
                         break;

                 case DNS_TXT_ITEM_TEXT:
                         r = dnssd_txt_item_new_from_string(key, value, &i);
                         if (r < 0)
                                 return log_oom();
                         break;

                 default:
                         assert_not_reached("Unknown type of Txt config");
                 }

                 LIST_INSERT_AFTER(items, txt_data->txt, last, i);
                 last = i;
         }

         if (!LIST_IS_EMPTY(txt_data->txt)) {
                 LIST_PREPEND(items, s->txt_data_items, txt_data);
                 txt_data = NULL;
         }

         return 0;
 }

 int manager_parse_config_file(Manager *m) {
         int r;

         assert(m);

         r = config_parse_many_nulstr(PKGSYSCONFDIR "/resolved.conf",
                                      CONF_PATHS_NULSTR("systemd/resolved.conf.d"),
                                      "Resolve\0",
                                      config_item_perf_lookup, resolved_gperf_lookup,
                                      CONFIG_PARSE_WARN, m);
         if (r < 0)
                 return r;

         if (m->need_builtin_fallbacks) {
                 r = manager_parse_dns_server_string_and_warn(m, DNS_SERVER_FALLBACK, DNS_SERVERS);
                 if (r < 0)
                         return r;
         }

 #if ! HAVE_GCRYPT
         if (m->dnssec_mode != DNSSEC_NO) {
                 log_warning("DNSSEC option cannot be enabled or set to allow-downgrade when systemd-resolved is built without gcrypt support. Turning off DNSSEC support.");
                 m->dnssec_mode = DNSSEC_NO;
         }
 #endif

 #if ! ENABLE_DNS_OVER_TLS
         if (m->dns_over_tls_mode != DNS_OVER_TLS_NO) {
                 log_warning("DNS-over-TLS option cannot be enabled or set to opportunistic when systemd-resolved is built without DNS-over-TLS support. Turning off DNS-over-TLS support.");
                 m->dns_over_tls_mode = DNS_OVER_TLS_NO;
         }
 #endif
         return 0;

 }
	/* SPDX-License-Identifier: LGPL-2.1+ */

	#include "alloc-util.h"
	#include "conf-parser.h"
	#include "def.h"
	#include "extract-word.h"
	#include "hexdecoct.h"
	#include "parse-util.h"
	#include "resolved-conf.h"
	#include "resolved-dnssd.h"
	#include "specifier.h"
	#include "string-table.h"
	#include "string-util.h"
	#include "utf8.h"

	DEFINE_CONFIG_PARSE_ENUM(config_parse_dns_stub_listener_mode, dns_stub_listener_mode, DnsStubListenerMode, "Failed to parse DNS stub listener mode setting");

	static const char* const dns_stub_listener_mode_table[_DNS_STUB_LISTENER_MODE_MAX] = {
	[DNS_STUB_LISTENER_NO] = "no",
	[DNS_STUB_LISTENER_UDP] = "udp",
	[DNS_STUB_LISTENER_TCP] = "tcp",
	[DNS_STUB_LISTENER_YES] = "yes",
	};
	DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dns_stub_listener_mode, DnsStubListenerMode, DNS_STUB_LISTENER_YES);

	static int manager_add_dns_server_by_string(Manager m, DnsServerType type, const char word) {
	union in_addr_union address;
	int family, r, ifindex = 0;
	DnsServer *s;

	assert(m);
	assert(word);

	r = in_addr_ifindex_from_string_auto(word, &family, &address, &ifindex);
	if (r < 0)
	return r;

	/* Silently filter out 0.0.0.0 and 127.0.0.53 (our own stub DNS listener) */
	if (!dns_server_address_valid(family, &address))
	return 0;

	/* Filter out duplicates */
	s = dns_server_find(manager_get_first_dns_server(m, type), family, &address, ifindex);
	if (s) {
	/*
	* Drop the marker. This is used to find the servers
	* that ceased to exist, see
	* manager_mark_dns_servers() and
	* manager_flush_marked_dns_servers().
	*/
	dns_server_move_back_and_unmark(s);
	return 0;
	}

	return dns_server_new(m, NULL, type, NULL, family, &address, ifindex);
	}

	int manager_parse_dns_server_string_and_warn(Manager m, DnsServerType type, const char string) {
	int r;

	assert(m);
	assert(string);

	for (;;) {
	_cleanup_free_ char *word = NULL;

	r = extract_first_word(&string, &word, NULL, 0);
	if (r < 0)
	return r;
	if (r == 0)
	break;

	r = manager_add_dns_server_by_string(m, type, word);
	if (r < 0)
	log_warning_errno(r, "Failed to add DNS server address '%s', ignoring: %m", word);
	}

	return 0;
	}

	static int manager_add_search_domain_by_string(Manager m, const char domain) {
	DnsSearchDomain *d;
	bool route_only;
	int r;

	assert(m);
	assert(domain);

	route_only = *domain == '~';
	if (route_only)
	domain++;

	if (dns_name_is_root(domain) \|\| streq(domain, "*")) {
	route_only = true;
	domain = ".";
	}

	r = dns_search_domain_find(m->search_domains, domain, &d);
	if (r < 0)
	return r;
	if (r > 0)
	dns_search_domain_move_back_and_unmark(d);
	else {
	r = dns_search_domain_new(m, &d, DNS_SEARCH_DOMAIN_SYSTEM, NULL, domain);
	if (r < 0)
	return r;
	}

	d->route_only = route_only;
	return 0;
	}

	int manager_parse_search_domains_and_warn(Manager m, const char string) {
	int r;

	assert(m);
	assert(string);

	for (;;) {
	_cleanup_free_ char *word = NULL;

	r = extract_first_word(&string, &word, NULL, EXTRACT_UNQUOTE);
	if (r < 0)
	return r;
	if (r == 0)
	break;

	r = manager_add_search_domain_by_string(m, word);
	if (r < 0)
	log_warning_errno(r, "Failed to add search domain '%s', ignoring: %m", word);
	}

	return 0;
	}

	int config_parse_dns_servers(
	const char *unit,
	const char *filename,
	unsigned line,
	const char *section,
	unsigned section_line,
	const char *lvalue,
	int ltype,
	const char *rvalue,
	void *data,
	void *userdata) {

	Manager *m = userdata;
	int r;

	assert(filename);
	assert(lvalue);
	assert(rvalue);
	assert(m);

	if (isempty(rvalue))
	/* Empty assignment means clear the list */
	dns_server_unlink_all(manager_get_first_dns_server(m, ltype));
	else {
	/* Otherwise, add to the list */
	r = manager_parse_dns_server_string_and_warn(m, ltype, rvalue);
	if (r < 0) {
	log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse DNS server string '%s'. Ignoring.", rvalue);
	return 0;
	}
	}

	/* If we have a manual setting, then we stop reading
	* /etc/resolv.conf */
	if (ltype == DNS_SERVER_SYSTEM)
	m->read_resolv_conf = false;
	if (ltype == DNS_SERVER_FALLBACK)
	m->need_builtin_fallbacks = false;

	return 0;
	}

	int config_parse_search_domains(
	const char *unit,
	const char *filename,
	unsigned line,
	const char *section,
	unsigned section_line,
	const char *lvalue,
	int ltype,
	const char *rvalue,
	void *data,
	void *userdata) {

	Manager *m = userdata;
	int r;

	assert(filename);
	assert(lvalue);
	assert(rvalue);
	assert(m);

	if (isempty(rvalue))
	/* Empty assignment means clear the list */
	dns_search_domain_unlink_all(m->search_domains);
	else {
	/* Otherwise, add to the list */
	r = manager_parse_search_domains_and_warn(m, rvalue);
	if (r < 0) {
	log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse search domains string '%s'. Ignoring.", rvalue);
	return 0;
	}
	}

	/* If we have a manual setting, then we stop reading
	* /etc/resolv.conf */
	m->read_resolv_conf = false;

	return 0;
	}

	int config_parse_dnssd_service_name(const char unit, const char filename, unsigned line, const char section, unsigned section_line, const char lvalue, int ltype, const char rvalue, void data, void *userdata) {
	static const Specifier specifier_table[] = {
	{ 'b', specifier_boot_id, NULL },
	{ 'H', specifier_host_name, NULL },
	{ 'm', specifier_machine_id, NULL },
	{ 'v', specifier_kernel_release, NULL },
	{}
	};
	DnssdService *s = userdata;
	_cleanup_free_ char *name = NULL;
	int r;

	assert(filename);
	assert(lvalue);
	assert(rvalue);
	assert(s);

	if (isempty(rvalue)) {
	log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name can't be empty. Ignoring.");
	return -EINVAL;
	}

	r = free_and_strdup(&s->name_template, rvalue);
	if (r < 0)
	return log_oom();

	r = specifier_printf(s->name_template, specifier_table, NULL, &name);
	if (r < 0)
	return log_debug_errno(r, "Failed to replace specifiers: %m");

	if (!dns_service_name_is_valid(name)) {
	log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name template renders to invalid name '%s'. Ignoring.", name);
	return -EINVAL;
	}

	return 0;
	}

	int config_parse_dnssd_service_type(const char unit, const char filename, unsigned line, const char section, unsigned section_line, const char lvalue, int ltype, const char rvalue, void data, void *userdata) {
	DnssdService *s = userdata;
	int r;

	assert(filename);
	assert(lvalue);
	assert(rvalue);
	assert(s);

	if (isempty(rvalue)) {
	log_syntax(unit, LOG_ERR, filename, line, 0, "Service type can't be empty. Ignoring.");
	return -EINVAL;
	}

	if (!dnssd_srv_type_is_valid(rvalue)) {
	log_syntax(unit, LOG_ERR, filename, line, 0, "Service type is invalid. Ignoring.");
	return -EINVAL;
	}

	r = free_and_strdup(&s->type, rvalue);
	if (r < 0)
	return log_oom();

	return 0;
	}

	int config_parse_dnssd_txt(const char unit, const char filename, unsigned line, const char section, unsigned section_line, const char lvalue, int ltype, const char rvalue, void data, void *userdata) {
	_cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL;
	DnssdService *s = userdata;
	DnsTxtItem *last = NULL;

	assert(filename);
	assert(lvalue);
	assert(rvalue);
	assert(s);

	if (isempty(rvalue)) {
	/* Flush out collected items */
	s->txt_data_items = dnssd_txtdata_free_all(s->txt_data_items);
	return 0;
	}

	txt_data = new0(DnssdTxtData, 1);
	if (!txt_data)
	return log_oom();

	for (;;) {
	_cleanup_free_ char *word = NULL;
	_cleanup_free_ char *key = NULL;
	_cleanup_free_ char *value = NULL;
	_cleanup_free_ void *decoded = NULL;
	size_t length = 0;
	DnsTxtItem *i;
	int r;

	r = extract_first_word(&rvalue, &word, NULL,
	EXTRACT_UNQUOTE\|EXTRACT_CUNESCAPE\|EXTRACT_CUNESCAPE_RELAX);
	if (r == 0)
	break;
	if (r == -ENOMEM)
	return log_oom();
	if (r < 0)
	return log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);

	r = split_pair(word, "=", &key, &value);
	if (r == -ENOMEM)
	return log_oom();
	if (r == -EINVAL)
	key = TAKE_PTR(word);

	if (!ascii_is_valid(key)) {
	log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid syntax, ignoring: %s", key);
	return -EINVAL;
	}

	switch (ltype) {

	case DNS_TXT_ITEM_DATA:
	if (value) {
	r = unbase64mem(value, strlen(value), &decoded, &length);
	if (r == -ENOMEM)
	return log_oom();
	if (r < 0)
	return log_syntax(unit, LOG_ERR, filename, line, r,
	"Invalid base64 encoding, ignoring: %s", value);
	}

	r = dnssd_txt_item_new_from_data(key, decoded, length, &i);
	if (r < 0)
	return log_oom();
	break;

	case DNS_TXT_ITEM_TEXT:
	r = dnssd_txt_item_new_from_string(key, value, &i);
	if (r < 0)
	return log_oom();
	break;

	default:
	assert_not_reached("Unknown type of Txt config");
	}

	LIST_INSERT_AFTER(items, txt_data->txt, last, i);
	last = i;
	}

	if (!LIST_IS_EMPTY(txt_data->txt)) {
	LIST_PREPEND(items, s->txt_data_items, txt_data);
	txt_data = NULL;
	}

	return 0;
	}

	int manager_parse_config_file(Manager *m) {
	int r;

	assert(m);

	r = config_parse_many_nulstr(PKGSYSCONFDIR "/resolved.conf",
	CONF_PATHS_NULSTR("systemd/resolved.conf.d"),
	"Resolve\0",
	config_item_perf_lookup, resolved_gperf_lookup,
	CONFIG_PARSE_WARN, m);
	if (r < 0)
	return r;

	if (m->need_builtin_fallbacks) {
	r = manager_parse_dns_server_string_and_warn(m, DNS_SERVER_FALLBACK, DNS_SERVERS);
	if (r < 0)
	return r;
	}

	#if ! HAVE_GCRYPT
	if (m->dnssec_mode != DNSSEC_NO) {
	log_warning("DNSSEC option cannot be enabled or set to allow-downgrade when systemd-resolved is built without gcrypt support. Turning off DNSSEC support.");
	m->dnssec_mode = DNSSEC_NO;
	}
	#endif

	#if ! ENABLE_DNS_OVER_TLS
	if (m->dns_over_tls_mode != DNS_OVER_TLS_NO) {
	log_warning("DNS-over-TLS option cannot be enabled or set to opportunistic when systemd-resolved is built without DNS-over-TLS support. Turning off DNS-over-TLS support.");
	m->dns_over_tls_mode = DNS_OVER_TLS_NO;
	}
	#endif
	return 0;

	}