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

 /***
   This file is part of systemd.

   Copyright 2014 Tom Gundersen <teg@jklm.no>

   systemd is free software; you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 of the License, or
   (at your option) any later version.

   systemd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  ***/

 #include "alloc-util.h"
 #include "conf-parser.h"
 #include "def.h"
 #include "extract-word.h"
 #include "parse-util.h"
 #include "resolved-conf.h"
 #include "string-table.h"
 #include "string-util.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);

 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;
 }

 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_QUOTES);
                 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 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,
                                      false, 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
         return 0;

 }
	/***
	This file is part of systemd.

	Copyright 2014 Tom Gundersen <teg@jklm.no>

	systemd is free software; you can redistribute it and/or modify it
	under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation; either version 2.1 of the License, or
	(at your option) any later version.

	systemd is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	***/

	#include "alloc-util.h"
	#include "conf-parser.h"
	#include "def.h"
	#include "extract-word.h"
	#include "parse-util.h"
	#include "resolved-conf.h"
	#include "string-table.h"
	#include "string-util.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);

	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;
	}

	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_QUOTES);
	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 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,
	false, 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
	return 0;

	}