2 * util/config_file.h - reads and stores the config file for unbound.
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
6 * This software is open source.
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9 * modification, are permitted provided that the following conditions
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16 * this list of conditions and the following disclaimer in the documentation
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25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 * This file contains functions for the config file.
42 #ifndef UTIL_CONFIG_FILE_H
43 #define UTIL_CONFIG_FILE_H
44 #include "sldns/rrdef.h"
48 struct config_strlist;
49 struct config_str2list;
50 struct config_str3list;
51 struct config_strbytelist;
54 struct ub_packed_rrset_key;
57 /** List head for strlist processing, used for append operation. */
58 struct config_strlist_head {
59 /** first in list of text items */
60 struct config_strlist* first;
61 /** last in list of text items */
62 struct config_strlist* last;
66 * The configuration options.
67 * Strings are malloced.
70 /** verbosity level as specified in the config file */
73 /** statistics interval (in seconds) */
75 /** if false, statistics values are reset after printing them */
77 /** if true, the statistics are kept in greater detail */
79 /** if true, inhibits a lot of =0 lines from the extended stats output */
80 int stat_inhibit_zero;
82 /** number of threads to create */
85 /** port on which queries are answered. */
87 /** do ip4 query support. */
89 /** do ip6 query support. */
91 /** do nat64 on queries */
93 /** prefer ip4 upstream queries. */
95 /** prefer ip6 upstream queries. */
97 /** do udp query support. */
99 /** do tcp query support. */
101 /** max number of queries on a reuse connection. */
102 size_t max_reuse_tcp_queries;
103 /** timeout for REUSE entries in milliseconds. */
104 int tcp_reuse_timeout;
105 /** timeout in milliseconds for TCP queries to auth servers. */
106 int tcp_auth_query_timeout;
107 /** tcp upstream queries (no UDP upstream queries) */
109 /** udp upstream enabled when no UDP downstream is enabled (do_udp no)*/
110 int udp_upstream_without_downstream;
111 /** maximum segment size of tcp socket which queries are answered */
113 /** maximum segment size of tcp socket for outgoing queries */
114 int outgoing_tcp_mss;
115 /** tcp idle timeout, in msec */
116 int tcp_idle_timeout;
117 /** do edns tcp keepalive */
118 int do_tcp_keepalive;
119 /** tcp keepalive timeout, in msec */
120 int tcp_keepalive_timeout;
121 /** timeout of packets sitting in the socket queue */
122 int sock_queue_timeout;
123 /** proxy protocol ports */
124 struct config_strlist* proxy_protocol_port;
126 /** private key file for dnstcp-ssl service (enabled if not NULL) */
127 char* ssl_service_key;
128 /** public key file for dnstcp-ssl service */
129 char* ssl_service_pem;
130 /** port on which to provide ssl service */
132 /** if outgoing tcp connections use SSL */
134 /** cert bundle for outgoing connections */
135 char* tls_cert_bundle;
136 /** should the system certificate store get added to the cert bundle */
138 /** additional tls ports */
139 struct config_strlist* tls_additional_port;
140 /** secret key used to encrypt and decrypt TLS session ticket */
141 struct config_strlist_head tls_session_ticket_keys;
144 /** TLS chiphersuites (TLSv1.3) */
145 char* tls_ciphersuites;
146 /** if SNI is to be used */
149 /** port on which to provide DNS over HTTPS service */
151 /** endpoint for HTTP service */
153 /** MAX_CONCURRENT_STREAMS HTTP/2 setting */
154 uint32_t http_max_streams;
155 /** maximum size of all HTTP2 query buffers combined. */
156 size_t http_query_buffer_size;
157 /** maximum size of all HTTP2 response buffers combined. */
158 size_t http_response_buffer_size;
159 /** set TCP_NODELAY option for http sockets */
161 /** Disable TLS for http sockets downstream */
162 int http_notls_downstream;
164 /** outgoing port range number of ports (per thread) */
165 int outgoing_num_ports;
166 /** number of outgoing tcp buffers per (per thread) */
167 size_t outgoing_num_tcp;
168 /** number of incoming tcp buffers per (per thread) */
169 size_t incoming_num_tcp;
170 /** allowed udp port numbers, array with 0 if not allowed */
171 int* outgoing_avail_ports;
173 /** EDNS buffer size to use */
174 size_t edns_buffer_size;
175 /** size of the stream wait buffers, max */
176 size_t stream_wait_size;
177 /** number of bytes buffer size for DNS messages */
178 size_t msg_buffer_size;
179 /** size of the message cache */
180 size_t msg_cache_size;
181 /** slabs in the message cache. */
182 size_t msg_cache_slabs;
183 /** number of queries every thread can service */
184 size_t num_queries_per_thread;
185 /** number of msec to wait before items can be jostled out */
187 /** size of the rrset cache */
188 size_t rrset_cache_size;
189 /** slabs in the rrset cache */
190 size_t rrset_cache_slabs;
191 /** host cache ttl in seconds */
193 /** number of slabs in the infra host cache */
194 size_t infra_cache_slabs;
195 /** max number of hosts in the infra cache */
196 size_t infra_cache_numhosts;
197 /** min value for infra cache rtt (min retransmit timeout) */
198 int infra_cache_min_rtt;
199 /** max value for infra cache rtt (max retransmit timeout) */
200 int infra_cache_max_rtt;
201 /** keep probing hosts that are down */
202 int infra_keep_probing;
203 /** delay close of udp-timeouted ports, if 0 no delayclose. in msec */
205 /** udp_connect enable uses UDP connect to mitigate ICMP side channel */
208 /** the target fetch policy for the iterator */
209 char* target_fetch_policy;
210 /** percent*10, how many times in 1000 to pick from the fastest
212 int fast_server_permil;
213 /** number of fastest server to select from */
214 size_t fast_server_num;
216 /** automatic interface for incoming messages. Uses ipv6 remapping,
217 * and recvmsg/sendmsg ancillary data to detect interfaces, boolean */
219 /** extra ports to open if if_automatic enabled, or NULL for default */
220 char* if_automatic_ports;
221 /** SO_RCVBUF size to set on port 53 UDP socket */
223 /** SO_SNDBUF size to set on port 53 UDP socket */
225 /** SO_REUSEPORT requested on port 53 sockets */
227 /** IP_TRANSPARENT socket option requested on port 53 sockets */
229 /** IP_FREEBIND socket option request on port 53 sockets */
231 /** IP_TOS socket option requested on port 53 sockets */
234 /** number of interfaces to open. If 0 default all interfaces. */
236 /** interface description strings (IP addresses) */
239 /** number of outgoing interfaces to open.
240 * If 0 default all interfaces. */
242 /** outgoing interface description strings (IP addresses) */
245 /** the root hints */
246 struct config_strlist* root_hints;
247 /** the stub definitions, linked list */
248 struct config_stub* stubs;
249 /** the forward zone definitions, linked list */
250 struct config_stub* forwards;
251 /** the auth zone definitions, linked list */
252 struct config_auth* auths;
253 /** the views definitions, linked list */
254 struct config_view* views;
255 /** list of donotquery addresses, linked list */
256 struct config_strlist* donotqueryaddrs;
258 /** list of servers we send edns-client-subnet option to and
259 * accept option from, linked list */
260 struct config_strlist* client_subnet;
261 /** list of zones we send edns-client-subnet option for */
262 struct config_strlist* client_subnet_zone;
263 /** opcode assigned by IANA for edns0-client-subnet option */
264 uint16_t client_subnet_opcode;
265 /** Do not check whitelist if incoming query contains an ECS record */
266 int client_subnet_always_forward;
267 /** Subnet length we are willing to give up privacy for */
268 uint8_t max_client_subnet_ipv4;
269 uint8_t max_client_subnet_ipv6;
270 /** Minimum subnet length we are willing to answer */
271 uint8_t min_client_subnet_ipv4;
272 uint8_t min_client_subnet_ipv6;
273 /** Max number of nodes in the ECS radix tree */
274 uint32_t max_ecs_tree_size_ipv4;
275 uint32_t max_ecs_tree_size_ipv6;
277 /** list of access control entries, linked list */
278 struct config_str2list* acls;
279 /** use default localhost donotqueryaddr entries */
280 int donotquery_localhost;
282 /** list of tcp connection limitss, linked list */
283 struct config_str2list* tcp_connection_limits;
285 /** harden against very small edns buffer sizes */
286 int harden_short_bufsize;
287 /** harden against very large query sizes */
288 int harden_large_queries;
289 /** harden against spoofed glue (out of zone data) */
291 /** harden against receiving no DNSSEC data for trust anchor */
292 int harden_dnssec_stripped;
293 /** harden against queries that fall under known nxdomain names */
294 int harden_below_nxdomain;
295 /** harden the referral path, query for NS,A,AAAA and validate */
296 int harden_referral_path;
297 /** harden against algorithm downgrade */
298 int harden_algo_downgrade;
299 /** harden against unknown records in the authority section and in
300 * the additional section */
301 int harden_unknown_additional;
302 /** use 0x20 bits in query as random ID bits */
303 int use_caps_bits_for_id;
304 /** 0x20 whitelist, domains that do not use capsforid */
305 struct config_strlist* caps_whitelist;
306 /** strip away these private addrs from answers, no DNS Rebinding */
307 struct config_strlist* private_address;
308 /** allow domain (and subdomains) to use private address space */
309 struct config_strlist* private_domain;
310 /** what threshold for unwanted action. */
311 size_t unwanted_threshold;
312 /** the number of seconds maximal TTL used for RRsets and messages */
314 /** the number of seconds minimum TTL used for RRsets and messages */
316 /** the number of seconds maximal negative TTL for SOA in auth */
317 int max_negative_ttl;
318 /** if prefetching of messages should be performed. */
320 /** if prefetching of DNSKEYs should be performed. */
322 /** deny queries of type ANY with an empty answer */
325 /** chrootdir, if not "" or chroot will be done */
327 /** username to change to, if not "". */
329 /** working directory */
331 /** filename to log to. */
333 /** pidfile to write pid to. */
336 /** should log messages be sent to syslogd */
338 /** log timestamp in ascii UTC */
340 /** log queries with one line per query */
342 /** log replies with one line per reply */
344 /** tag log_queries and log_replies for filtering */
345 int log_tag_queryreply;
346 /** log every local-zone hit **/
347 int log_local_actions;
348 /** log servfails with a reason */
350 /** log identity to report */
353 /** do not report identity (id.server, hostname.bind) */
355 /** do not report version (version.server, version.bind) */
357 /** do not report trustanchor (trustanchor.unbound) */
358 int hide_trustanchor;
359 /** do not report the User-Agent HTTP header */
360 int hide_http_user_agent;
361 /** identity, hostname is returned if "". */
363 /** version, package version returned if "". */
365 /** User-Agent for HTTP header */
366 char* http_user_agent;
372 /** the module configuration string */
375 /** files with trusted DS and DNSKEYs in zonefile format, list */
376 struct config_strlist* trust_anchor_file_list;
377 /** list of trustanchor keys, linked list */
378 struct config_strlist* trust_anchor_list;
379 /** files with 5011 autotrust tracked keys */
380 struct config_strlist* auto_trust_anchor_file_list;
381 /** files with trusted DNSKEYs in named.conf format, list */
382 struct config_strlist* trusted_keys_file_list;
383 /** insecure domain list */
384 struct config_strlist* domain_insecure;
385 /** send key tag query */
386 int trust_anchor_signaling;
387 /** enable root key sentinel */
388 int root_key_sentinel;
390 /** if not 0, this value is the validation date for RRSIGs */
391 int32_t val_date_override;
392 /** the minimum for signature clock skew */
393 int32_t val_sig_skew_min;
394 /** the maximum for signature clock skew */
395 int32_t val_sig_skew_max;
396 /** max number of query restarts, number of IPs to probe */
397 int32_t val_max_restart;
398 /** this value sets the number of seconds before revalidating bogus */
400 /** should validator clean additional section for secure msgs */
401 int val_clean_additional;
402 /** log bogus messages by the validator */
404 /** squelch val_log_level to log - this is library goes to callback */
406 /** should validator allow bogus messages to go through */
407 int val_permissive_mode;
408 /** use cached NSEC records to synthesise (negative) answers */
410 /** ignore the CD flag in incoming queries and refuse them bogus data */
412 /** disable EDNS DO flag in outgoing requests */
414 /** serve expired entries and prefetch them */
416 /** serve expired entries until TTL after expiration */
417 int serve_expired_ttl;
418 /** reset serve expired TTL after failed update attempt */
419 int serve_expired_ttl_reset;
420 /** TTL for the serve expired replies */
421 int serve_expired_reply_ttl;
422 /** serve expired entries only after trying to update the entries and this
423 * timeout (in milliseconds) is reached */
424 int serve_expired_client_timeout;
425 /** serve EDE code 3 - Stale Answer (RFC8914) for expired entries */
426 int ede_serve_expired;
427 /** serve original TTLs rather than decrementing ones */
428 int serve_original_ttl;
429 /** nsec3 maximum iterations per key size, string */
430 char* val_nsec3_key_iterations;
431 /** if zonemd failures are permitted, only logged */
432 int zonemd_permissive_mode;
433 /** autotrust add holddown time, in seconds */
434 unsigned int add_holddown;
435 /** autotrust del holddown time, in seconds */
436 unsigned int del_holddown;
437 /** autotrust keep_missing time, in seconds. 0 is forever. */
438 unsigned int keep_missing;
439 /** permit small holddown values, allowing 5011 rollover very fast */
440 int permit_small_holddown;
442 /** size of the key cache */
443 size_t key_cache_size;
444 /** slabs in the key cache. */
445 size_t key_cache_slabs;
446 /** size of the neg cache */
447 size_t neg_cache_size;
449 /** local zones config */
450 struct config_str2list* local_zones;
451 /** local zones nodefault list */
452 struct config_strlist* local_zones_nodefault;
454 /** local zones ipset list */
455 struct config_strlist* local_zones_ipset;
457 /** do not add any default local zone */
458 int local_zones_disable_default;
459 /** local data RRs configured */
460 struct config_strlist* local_data;
461 /** local zone override types per netblock */
462 struct config_str3list* local_zone_overrides;
463 /** unblock lan zones (reverse lookups for AS112 zones) */
464 int unblock_lan_zones;
465 /** insecure lan zones (don't validate AS112 zones) */
466 int insecure_lan_zones;
467 /** list of zonename, tagbitlist */
468 struct config_strbytelist* local_zone_tags;
469 /** list of aclname, tagbitlist */
470 struct config_strbytelist* acl_tags;
471 /** list of aclname, tagname, localzonetype */
472 struct config_str3list* acl_tag_actions;
473 /** list of aclname, tagname, redirectdata */
474 struct config_str3list* acl_tag_datas;
475 /** list of aclname, view*/
476 struct config_str2list* acl_view;
477 /** list of interface action entries, linked list */
478 struct config_str2list* interface_actions;
479 /** list of interface, tagbitlist */
480 struct config_strbytelist* interface_tags;
481 /** list of interface, tagname, localzonetype */
482 struct config_str3list* interface_tag_actions;
483 /** list of interface, tagname, redirectdata */
484 struct config_str3list* interface_tag_datas;
485 /** list of interface, view*/
486 struct config_str2list* interface_view;
487 /** list of IP-netblock, tagbitlist */
488 struct config_strbytelist* respip_tags;
489 /** list of response-driven access control entries, linked list */
490 struct config_str2list* respip_actions;
491 /** RRs configured for response-driven access controls */
492 struct config_str2list* respip_data;
493 /** tag list, array with tagname[i] is malloced string */
495 /** number of items in the taglist */
498 /** remote control section. enable toggle. */
499 int remote_control_enable;
500 /** the interfaces the remote control should listen on */
501 struct config_strlist_head control_ifs;
502 /** if the use-cert option is set */
503 int control_use_cert;
504 /** port number for the control port */
506 /** private key file for server */
507 char* server_key_file;
508 /** certificate file for server */
509 char* server_cert_file;
510 /** private key file for unbound-control */
511 char* control_key_file;
512 /** certificate file for unbound-control */
513 char* control_cert_file;
515 /** Python script file */
516 struct config_strlist* python_script;
518 /** Dynamic library file */
519 struct config_strlist* dynlib_file;
521 /** Use systemd socket activation. */
524 /** daemonize, i.e. fork into the background. */
527 /* minimal response when positive answer */
528 int minimal_responses;
530 /* RRSet roundrobin */
531 int rrset_roundrobin;
533 /* wait time for unknown server in msec */
534 int unknown_server_time_limit;
536 /* maximum UDP response size */
542 /* Synthetize all AAAA record despite the presence of an authoritative one */
544 /** ignore AAAAs for these domain names and use A record anyway */
545 struct config_strlist* dns64_ignore_aaaa;
547 /* NAT64 prefix; if unset defaults to dns64_prefix */
550 /** true to enable dnstap support */
552 /** using bidirectional frame streams if true */
553 int dnstap_bidirectional;
554 /** dnstap socket path */
555 char* dnstap_socket_path;
558 /** dnstap TLS enable */
560 /** dnstap tls server authentication name */
561 char* dnstap_tls_server_name;
562 /** dnstap server cert bundle */
563 char* dnstap_tls_cert_bundle;
564 /** dnstap client key for client authentication */
565 char* dnstap_tls_client_key_file;
566 /** dnstap client cert for client authentication */
567 char* dnstap_tls_client_cert_file;
568 /** true to send "identity" via dnstap */
569 int dnstap_send_identity;
570 /** true to send "version" via dnstap */
571 int dnstap_send_version;
572 /** dnstap "identity", hostname is used if "". */
573 char* dnstap_identity;
574 /** dnstap "version", package version is used if "". */
575 char* dnstap_version;
577 /** true to log dnstap RESOLVER_QUERY message events */
578 int dnstap_log_resolver_query_messages;
579 /** true to log dnstap RESOLVER_RESPONSE message events */
580 int dnstap_log_resolver_response_messages;
581 /** true to log dnstap CLIENT_QUERY message events */
582 int dnstap_log_client_query_messages;
583 /** true to log dnstap CLIENT_RESPONSE message events */
584 int dnstap_log_client_response_messages;
585 /** true to log dnstap FORWARDER_QUERY message events */
586 int dnstap_log_forwarder_query_messages;
587 /** true to log dnstap FORWARDER_RESPONSE message events */
588 int dnstap_log_forwarder_response_messages;
590 /** true to disable DNSSEC lameness check in iterator */
591 int disable_dnssec_lame_check;
593 /** ratelimit for ip addresses. 0 is off, otherwise qps (unless overridden) */
595 /** ratelimit for ip addresses with a valid DNS Cookie. 0 is off,
596 * otherwise qps (unless overridden) */
597 int ip_ratelimit_cookie;
598 /** number of slabs for ip_ratelimit cache */
599 size_t ip_ratelimit_slabs;
600 /** memory size in bytes for ip_ratelimit cache */
601 size_t ip_ratelimit_size;
602 /** ip_ratelimit factor, 0 blocks all, 10 allows 1/10 of traffic */
603 int ip_ratelimit_factor;
604 /** ratelimit backoff, when on, if the limit is reached it is
605 * considered an attack and it backs off until 'demand' decreases over
606 * the RATE_WINDOW. */
607 int ip_ratelimit_backoff;
609 /** ratelimit for domains. 0 is off, otherwise qps (unless overridden) */
611 /** number of slabs for ratelimit cache */
612 size_t ratelimit_slabs;
613 /** memory size in bytes for ratelimit cache */
614 size_t ratelimit_size;
615 /** ratelimits for domain (exact match) */
616 struct config_str2list* ratelimit_for_domain;
617 /** ratelimits below domain */
618 struct config_str2list* ratelimit_below_domain;
619 /** ratelimit factor, 0 blocks all, 10 allows 1/10 of traffic */
620 int ratelimit_factor;
621 /** ratelimit backoff, when on, if the limit is reached it is
622 * considered an attack and it backs off until 'demand' decreases over
623 * the RATE_WINDOW. */
624 int ratelimit_backoff;
626 /** number of retries on outgoing queries */
627 int outbound_msg_retry;
628 /** max sent queries per qstate; resets on query restarts (e.g.,
629 * CNAMES) and referrals */
631 /** max number of query restarts; determines max length of CNAME chain */
632 int max_query_restarts;
633 /** minimise outgoing QNAME and hide original QTYPE if possible */
634 int qname_minimisation;
635 /** minimise QNAME in strict mode, minimise according to RFC.
636 * Do not apply fallback */
637 int qname_minimisation_strict;
638 /** SHM data - true if shm is enabled */
640 /** SHM data - key for the shm */
643 /** list of EDNS client string entries, linked list */
644 struct config_str2list* edns_client_strings;
645 /** EDNS opcode to use for EDNS client strings */
646 uint16_t edns_client_string_opcode;
649 /** true to enable dnscrypt */
651 /** port on which to provide dnscrypt service */
653 /** provider name 2.dnscrypt-cert.example.com */
654 char* dnscrypt_provider;
655 /** dnscrypt secret keys 1.key */
656 struct config_strlist* dnscrypt_secret_key;
657 /** dnscrypt provider certs 1.cert */
658 struct config_strlist* dnscrypt_provider_cert;
659 /** dnscrypt provider certs 1.cert which have been rotated and should not be
660 * advertised through DNS's providername TXT record but are required to be
661 * able to handle existing traffic using the old cert. */
662 struct config_strlist* dnscrypt_provider_cert_rotated;
663 /** memory size in bytes for dnscrypt shared secrets cache */
664 size_t dnscrypt_shared_secret_cache_size;
665 /** number of slabs for dnscrypt shared secrets cache */
666 size_t dnscrypt_shared_secret_cache_slabs;
667 /** memory size in bytes for dnscrypt nonces cache */
668 size_t dnscrypt_nonce_cache_size;
669 /** number of slabs for dnscrypt nonces cache */
670 size_t dnscrypt_nonce_cache_slabs;
672 /** EDNS padding according to RFC7830 and RFC8467 */
673 /** true to enable padding of responses (default: on) */
675 /** block size with which to pad encrypted responses (default: 468) */
676 size_t pad_responses_block_size;
677 /** true to enable padding of queries (default: on) */
679 /** block size with which to pad encrypted queries (default: 128) */
680 size_t pad_queries_block_size;
684 /** false to bypass the IPsec module */
685 int ipsecmod_enabled;
686 /** whitelisted domains for ipsecmod */
687 struct config_strlist* ipsecmod_whitelist;
688 /** path to external hook */
690 /** true to proceed even with a bogus IPSECKEY */
691 int ipsecmod_ignore_bogus;
692 /** max TTL for the A/AAAA records that call the hook */
693 int ipsecmod_max_ttl;
694 /** false to proceed even when ipsecmod_hook fails */
700 /** backend DB name */
701 char* cachedb_backend;
702 /** secret seed for hash key calculation */
703 char* cachedb_secret;
704 /** cachedb that does not store, but only reads from database, if on */
705 int cachedb_no_store;
707 /** redis server's IP address or host name */
708 char* redis_server_host;
709 /** redis server's TCP port */
710 int redis_server_port;
711 /** redis server's unix path. Or "", NULL if unused */
712 char* redis_server_path;
713 /** redis server's AUTH password. Or "", NULL if unused */
714 char* redis_server_password;
715 /** timeout (in ms) for communication with the redis server */
717 /** set timeout on redis records based on DNS response ttl */
718 int redis_expire_records;
719 /** set the redis logical database upon connection */
720 int redis_logical_db;
723 /** Downstream DNS Cookies */
724 /** do answer with server cookie when request contained cookie option */
725 int do_answer_cookie;
727 uint8_t cookie_secret[40];
728 /** cookie secret length */
729 size_t cookie_secret_len;
736 /** respond with Extended DNS Errors (RFC8914) */
740 /** from cfg username, after daemonize setup performed */
741 extern uid_t cfg_uid;
742 /** from cfg username, after daemonize setup performed */
743 extern gid_t cfg_gid;
744 /** debug and enable small timeouts */
745 extern int autr_permit_small_holddown;
746 /** size (in bytes) of stream wait buffers max */
747 extern size_t stream_wait_max;
748 /** size (in bytes) of all total HTTP2 query buffers max */
749 extern size_t http2_query_buffer_max;
750 /** size (in bytes) of all total HTTP2 response buffers max */
751 extern size_t http2_response_buffer_max;
754 * Stub config options
758 struct config_stub* next;
759 /** domain name (in text) of the stub apex domain */
761 /** list of stub nameserver hosts (domain name) */
762 struct config_strlist* hosts;
763 /** list of stub nameserver addresses (IP address) */
764 struct config_strlist* addrs;
765 /** if stub-prime is set */
767 /** if forward-first is set (failover to without if fails) */
769 /** use tcp for queries to this stub */
771 /** use SSL for queries to this stub */
778 * Auth config options
782 struct config_auth* next;
783 /** domain name (in text) of the auth apex domain */
785 /** list of masters */
786 struct config_strlist* masters;
788 struct config_strlist* urls;
789 /** list of allow-notify */
790 struct config_strlist* allow_notify;
791 /** zonefile (or NULL) */
793 /** provide downstream answers */
795 /** provide upstream answers */
797 /** fallback to recursion to authorities if zone expired and other
798 * reasons perhaps (like, query bogus) */
799 int fallback_enabled;
800 /** this zone is used to create local-zone policies */
802 /** rpz tags (or NULL) */
803 uint8_t* rpz_taglist;
804 /** length of the taglist (in bytes) */
805 size_t rpz_taglistlen;
806 /** Override RPZ action for this zone, regardless of zone content */
807 char* rpz_action_override;
808 /** Log when this RPZ policy is applied */
810 /** Display this name in the log when RPZ policy is applied */
812 /** Always reply with this CNAME target if the cname override action is
815 /** signal nxdomain block with unset RA */
816 int rpz_signal_nxdomain_ra;
817 /** Check ZONEMD records for this zone */
819 /** Reject absence of ZONEMD records, zone must have one */
820 int zonemd_reject_absence;
824 * View config options
828 struct config_view* next;
832 struct config_str2list* local_zones;
833 /** local data RRs */
834 struct config_strlist* local_data;
835 /** local zones nodefault list */
836 struct config_strlist* local_zones_nodefault;
838 /** local zones ipset list */
839 struct config_strlist* local_zones_ipset;
841 /** Fallback to global local_zones when there is no match in the view
842 * view specific tree. 1 for yes, 0 for no */
844 /** predefined actions for particular IP address responses */
845 struct config_str2list* respip_actions;
846 /** data complementing the 'redirect' response IP actions */
847 struct config_str2list* respip_data;
851 * List of strings for config options
853 struct config_strlist {
854 /** next item in list */
855 struct config_strlist* next;
856 /** config option string */
861 * List of two strings for config options
863 struct config_str2list {
864 /** next item in list */
865 struct config_str2list* next;
873 * List of three strings for config options
875 struct config_str3list {
876 /** next item in list */
877 struct config_str3list* next;
888 * List of string, bytestring for config options
890 struct config_strbytelist {
891 /** next item in list */
892 struct config_strbytelist* next;
895 /** second bytestring */
901 * Create config file structure. Filled with default values.
902 * @return: the new structure or NULL on memory error.
904 struct config_file* config_create(void);
907 * Create config file structure for library use. Filled with default values.
908 * @return: the new structure or NULL on memory error.
910 struct config_file* config_create_forlib(void);
913 * Read the config file from the specified filename.
914 * @param config: where options are stored into, must be freshly created.
915 * @param filename: name of configfile. If NULL nothing is done.
916 * @param chroot: if not NULL, the chroot dir currently in use (for include).
917 * @return: false on error. In that case errno is set, ENOENT means
920 int config_read(struct config_file* config, const char* filename,
924 * Destroy the config file structure.
925 * @param config: to delete.
927 void config_delete(struct config_file* config);
930 * Apply config to global constants; this routine is called in single thread.
931 * @param config: to apply. Side effect: global constants change.
933 void config_apply(struct config_file* config);
936 * Find username, sets cfg_uid and cfg_gid.
937 * @param config: the config structure.
939 void config_lookup_uid(struct config_file* config);
942 * Set the given keyword to the given value.
943 * @param config: where to store config
944 * @param option: option name, including the ':' character.
945 * @param value: value, this string is copied if needed, or parsed.
946 * The caller owns the value string.
947 * @return 0 on error (malloc or syntax error).
949 int config_set_option(struct config_file* config, const char* option,
953 * Call print routine for the given option.
954 * @param cfg: config.
955 * @param opt: option name without trailing :.
956 * This is different from config_set_option.
957 * @param func: print func, called as (str, arg) for every data element.
958 * @param arg: user argument for print func.
959 * @return false if the option name is not supported (syntax error).
961 int config_get_option(struct config_file* cfg, const char* opt,
962 void (*func)(char*,void*), void* arg);
965 * Get an option and return strlist
966 * @param cfg: config file
967 * @param opt: option name.
968 * @param list: list is returned here. malloced, caller must free it.
969 * @return 0=OK, 1=syntax error, 2=malloc failed.
971 int config_get_option_list(struct config_file* cfg, const char* opt,
972 struct config_strlist** list);
975 * Get an option and collate results into string
976 * @param cfg: config file
977 * @param opt: option name.
978 * @param str: string. malloced, caller must free it.
979 * @return 0=OK, 1=syntax error, 2=malloc failed.
981 int config_get_option_collate(struct config_file* cfg, const char* opt,
985 * function to print to a file, use as func with config_get_option.
986 * @param line: text to print. \n appended.
987 * @param arg: pass a FILE*, like stdout.
989 void config_print_func(char* line, void* arg);
992 * function to collate the text strings into a strlist_head.
993 * @param line: text to append.
994 * @param arg: pass a strlist_head structure. zeroed on start.
996 void config_collate_func(char* line, void* arg);
999 * take a strlist_head list and return a malloc string. separated with newline.
1000 * @param list: strlist first to collate. zeroes return "".
1001 * @return NULL on malloc failure. Or if malloc failure happened in strlist.
1003 char* config_collate_cat(struct config_strlist* list);
1006 * Append text at end of list.
1007 * @param list: list head. zeroed at start.
1008 * @param item: new item. malloced by caller. if NULL the insertion fails.
1009 * @return true on success.
1010 * on fail the item is free()ed.
1012 int cfg_strlist_append(struct config_strlist_head* list, char* item);
1015 * Searches the end of a string list and appends the given text.
1016 * @param head: pointer to strlist head variable.
1017 * @param item: new item. malloced by caller. if NULL the insertion fails.
1018 * @return true on success.
1020 int cfg_strlist_append_ex(struct config_strlist** head, char* item);
1023 * Find string in strlist.
1024 * @param head: pointer to strlist head variable.
1025 * @param item: the item to search for.
1026 * @return: the element in the list when found, NULL otherwise.
1028 struct config_strlist* cfg_strlist_find(struct config_strlist* head,
1032 * Insert string into strlist.
1033 * @param head: pointer to strlist head variable.
1034 * @param item: new item. malloced by caller. If NULL the insertion fails.
1035 * @return: true on success.
1036 * on fail, the item is free()d.
1038 int cfg_strlist_insert(struct config_strlist** head, char* item);
1040 /** insert with region for allocation. */
1041 int cfg_region_strlist_insert(struct regional* region,
1042 struct config_strlist** head, char* item);
1045 * Insert string into str2list.
1046 * @param head: pointer to str2list head variable.
1047 * @param item: new item. malloced by caller. If NULL the insertion fails.
1048 * @param i2: 2nd string, malloced by caller. If NULL the insertion fails.
1049 * @return: true on success.
1050 * on fail, the item and i2 are free()d.
1052 int cfg_str2list_insert(struct config_str2list** head, char* item, char* i2);
1055 * Insert string into str3list.
1056 * @param head: pointer to str3list head variable.
1057 * @param item: new item. malloced by caller. If NULL the insertion fails.
1058 * @param i2: 2nd string, malloced by caller. If NULL the insertion fails.
1059 * @param i3: 3rd string, malloced by caller. If NULL the insertion fails.
1060 * @return: true on success.
1062 int cfg_str3list_insert(struct config_str3list** head, char* item, char* i2,
1066 * Insert string into strbytelist.
1067 * @param head: pointer to strbytelist head variable.
1068 * @param item: new item. malloced by caller. If NULL the insertion fails.
1069 * @param i2: 2nd string, malloced by caller. If NULL the insertion fails.
1070 * @param i2len: length of the i2 bytestring.
1071 * @return: true on success.
1073 int cfg_strbytelist_insert(struct config_strbytelist** head, char* item,
1074 uint8_t* i2, size_t i2len);
1077 * Find stub in config list, also returns prevptr (for deletion).
1078 * @param pp: call routine with pointer to a pointer to the start of the list,
1079 * if the stub is found, on exit, the value contains a pointer to the
1080 * next pointer that points to the found element (or to the list start
1081 * pointer if it is the first element).
1082 * @param nm: name of stub to find.
1083 * @return: pointer to config_stub if found, or NULL if not found.
1085 struct config_stub* cfg_stub_find(struct config_stub*** pp, const char* nm);
1088 * Delete items in config string list.
1089 * @param list: list.
1091 void config_delstrlist(struct config_strlist* list);
1094 * Delete items in config double string list.
1095 * @param list: list.
1097 void config_deldblstrlist(struct config_str2list* list);
1100 * Delete items in config triple string list.
1101 * @param list: list.
1103 void config_deltrplstrlist(struct config_str3list* list);
1105 /** delete string array */
1106 void config_del_strarray(char** array, int num);
1108 /** delete stringbytelist */
1109 void config_del_strbytelist(struct config_strbytelist* list);
1112 * Delete a stub item
1113 * @param p: stub item
1115 void config_delstub(struct config_stub* p);
1118 * Delete items in config stub list.
1119 * @param list: list.
1121 void config_delstubs(struct config_stub* list);
1124 * Delete an auth item
1125 * @param p: auth item
1127 void config_delauth(struct config_auth* p);
1130 * Delete items in config auth list.
1131 * @param list: list.
1133 void config_delauths(struct config_auth* list);
1136 * Delete a view item
1137 * @param p: view item
1139 void config_delview(struct config_view* p);
1142 * Delete items in config view list.
1143 * @param list: list.
1145 void config_delviews(struct config_view* list);
1147 /** check if config for remote control turns on IP-address interface
1148 * with certificates or a named pipe without certificates. */
1149 int options_remote_is_address(struct config_file* cfg);
1152 * Convert 14digit to time value
1153 * @param str: string of 14 digits
1154 * @return time value or 0 for error.
1156 time_t cfg_convert_timeval(const char* str);
1159 * Count number of values in the string.
1160 * format ::= (sp num)+ sp
1162 * sp ::= (space|tab)*
1164 * @param str: string
1165 * @return: 0 on parse error, or empty string, else
1166 * number of integer values in the string.
1168 int cfg_count_numbers(const char* str);
1171 * Convert a 'nice' memory or file size into a bytecount
1172 * From '100k' to 102400. and so on. Understands kKmMgG.
1173 * k=1024, m=1024*1024, g=1024*1024*1024.
1174 * @param str: string
1175 * @param res: result is stored here, size in bytes.
1176 * @return: true if parsed correctly, or 0 on a parse error (and an error
1179 int cfg_parse_memsize(const char* str, size_t* res);
1182 * Parse nsid from string into binary nsid. nsid is either a hexadecimal
1183 * string or an ascii string prepended with ascii_ in which case the
1184 * characters after ascii_ are simply copied.
1185 * @param str: the string to parse.
1186 * @param nsid_len: returns length of nsid in bytes.
1187 * @return malloced bytes or NULL on parse error or malloc failure.
1189 uint8_t* cfg_parse_nsid(const char* str, uint16_t* nsid_len);
1192 * Add a tag name to the config. It is added at the end with a new ID value.
1193 * @param cfg: the config structure.
1194 * @param tag: string (which is copied) with the name.
1195 * @return: false on alloc failure.
1197 int config_add_tag(struct config_file* cfg, const char* tag);
1200 * Find tag ID in the tag list.
1201 * @param cfg: the config structure.
1202 * @param tag: string with tag name to search for.
1203 * @return: 0..(num_tags-1) with tag ID, or -1 if tagname is not found.
1205 int find_tag_id(struct config_file* cfg, const char* tag);
1208 * parse taglist from string into bytestring with bitlist.
1209 * @param cfg: the config structure (with tagnames)
1210 * @param str: the string to parse. Parse puts 0 bytes in string.
1211 * @param listlen: returns length of in bytes.
1212 * @return malloced bytes with a bitlist of the tags. or NULL on parse error
1213 * or malloc failure.
1215 uint8_t* config_parse_taglist(struct config_file* cfg, char* str,
1219 * convert tag bitlist to a malloced string with tag names. For debug output.
1220 * @param cfg: the config structure (with tagnames)
1221 * @param taglist: the tag bitlist.
1222 * @param len: length of the tag bitlist.
1223 * @return malloced string or NULL.
1225 char* config_taglist2str(struct config_file* cfg, uint8_t* taglist,
1229 * see if two taglists intersect (have tags in common).
1230 * @param list1: first tag bitlist.
1231 * @param list1len: length in bytes of first list.
1232 * @param list2: second tag bitlist.
1233 * @param list2len: length in bytes of second list.
1234 * @return true if there are tags in common, 0 if not.
1236 int taglist_intersect(uint8_t* list1, size_t list1len, const uint8_t* list2,
1240 * Parse local-zone directive into two strings and register it in the config.
1241 * @param cfg: to put it in.
1242 * @param val: argument strings to local-zone, "example.com nodefault".
1243 * @return: false on failure
1245 int cfg_parse_local_zone(struct config_file* cfg, const char* val);
1248 * Mark "number" or "low-high" as available or not in ports array.
1249 * @param str: string in input
1250 * @param allow: give true if this range is permitted.
1251 * @param avail: the array from cfg.
1252 * @param num: size of the array (65536).
1253 * @return: true if parsed correctly, or 0 on a parse error (and an error
1256 int cfg_mark_ports(const char* str, int allow, int* avail, int num);
1259 * Get a condensed list of ports returned. allocated.
1260 * @param cfg: config file.
1261 * @param avail: the available ports array is returned here.
1262 * @return: number of ports in array or 0 on error.
1264 int cfg_condense_ports(struct config_file* cfg, int** avail);
1267 * Apply system specific port range policy.
1268 * @param cfg: config file.
1269 * @param num: size of the array (65536).
1271 void cfg_apply_local_port_policy(struct config_file* cfg, int num);
1274 * Scan ports available
1275 * @param avail: the array from cfg.
1276 * @param num: size of the array (65536).
1277 * @return the number of ports available for use.
1279 int cfg_scan_ports(int* avail, int num);
1282 * Convert a filename to full pathname in original filesys
1283 * @param fname: the path name to convert.
1284 * Must not be null or empty.
1285 * @param cfg: config struct for chroot and chdir (if set).
1286 * @param use_chdir: if false, only chroot is applied.
1287 * @return pointer to malloced buffer which is: [chroot][chdir]fname
1288 * or NULL on malloc failure.
1290 char* fname_after_chroot(const char* fname, struct config_file* cfg,
1294 * Convert a ptr shorthand into a full reverse-notation PTR record.
1295 * @param str: input string, "IP name"
1296 * @return: malloced string "reversed-ip-name PTR name"
1298 char* cfg_ptr_reverse(char* str);
1301 * Used during options parsing
1303 struct config_parser_state {
1304 /** name of file being parser */
1306 /** line number in the file, starts at 1 */
1308 /** number of errors encountered */
1310 /** the result of parsing is stored here. */
1311 struct config_file* cfg;
1312 /** the current chroot dir (or NULL if none) */
1314 /** if we are started in a toplevel, or not, after a force_toplevel */
1315 int started_toplevel;
1318 /** global config parser object used during config parsing */
1319 extern struct config_parser_state* cfg_parser;
1320 /** init lex state */
1321 void init_cfg_parse(void);
1323 extern FILE* ub_c_in;
1325 extern FILE* ub_c_out;
1326 /** the yacc lex generated parse function */
1327 int ub_c_parse(void);
1328 /** the lexer function */
1330 /** wrap function */
1331 int ub_c_wrap(void);
1332 /** parsing helpers: print error with file and line numbers */
1333 void ub_c_error(const char* msg);
1334 /** parsing helpers: print error with file and line numbers */
1335 void ub_c_error_msg(const char* fmt, ...) ATTR_FORMAT(printf, 1, 2);
1337 #ifdef UB_ON_WINDOWS
1339 * Obtain registry string (if it exists).
1340 * @param key: key string
1341 * @param name: name of value to fetch.
1342 * @return malloced string with the result or NULL if it did not
1343 * exist on an error (logged with log_err) was encountered.
1345 char* w_lookup_reg_str(const char* key, const char* name);
1347 /** Modify directory in options for module file name */
1348 void w_config_adjust_directory(struct config_file* cfg);
1349 #endif /* UB_ON_WINDOWS */
1351 /** debug option for unit tests. */
1352 extern int fake_dsa, fake_sha1;
1354 /** see if interface is https, its port number == the https port number */
1355 int if_is_https(const char* ifname, const char* port, int https_port);
1358 * Return true if the config contains settings that enable https.
1359 * @param cfg: config information.
1360 * @return true if https ports are used for server.
1362 int cfg_has_https(struct config_file* cfg);
1364 /** see if interface is PROXYv2, its port number == the proxy port number */
1365 int if_is_pp2(const char* ifname, const char* port,
1366 struct config_strlist* proxy_protocol_port);
1368 /** see if interface is DNSCRYPT, its port number == the dnscrypt port number */
1369 int if_is_dnscrypt(const char* ifname, const char* port, int dnscrypt_port);
1370 #ifdef USE_LINUX_IP_LOCAL_PORT_RANGE
1371 #define LINUX_IP_LOCAL_PORT_RANGE_PATH "/proc/sys/net/ipv4/ip_local_port_range"
1374 #endif /* UTIL_CONFIG_FILE_H */