/* * util/config_file.h - reads and stores the config file for unbound. * * Copyright (c) 2007, NLnet Labs. All rights reserved. * * This software is open source. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of the NLNET LABS nor the names of its contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** * \file * * This file contains functions for the config file. */ #ifndef UTIL_CONFIG_FILE_H #define UTIL_CONFIG_FILE_H struct config_stub; struct config_strlist; struct config_str2list; struct module_qstate; struct sock_list; struct ub_packed_rrset_key; /** * The configuration options. * Strings are malloced. */ struct config_file { /** verbosity level as specified in the config file */ int verbosity; /** statistics interval (in seconds) */ int stat_interval; /** if false, statistics values are reset after printing them */ int stat_cumulative; /** if true, the statistics are kept in greater detail */ int stat_extended; /** number of threads to create */ int num_threads; /** port on which queries are answered. */ int port; /** do ip4 query support. */ int do_ip4; /** do ip6 query support. */ int do_ip6; /** do udp query support. */ int do_udp; /** do tcp query support. */ int do_tcp; /** tcp upstream queries (no UDP upstream queries) */ int tcp_upstream; /** private key file for dnstcp-ssl service (enabled if not NULL) */ char* ssl_service_key; /** public key file for dnstcp-ssl service */ char* ssl_service_pem; /** port on which to provide ssl service */ int ssl_port; /** if outgoing tcp connections use SSL */ int ssl_upstream; /** outgoing port range number of ports (per thread) */ int outgoing_num_ports; /** number of outgoing tcp buffers per (per thread) */ size_t outgoing_num_tcp; /** number of incoming tcp buffers per (per thread) */ size_t incoming_num_tcp; /** allowed udp port numbers, array with 0 if not allowed */ int* outgoing_avail_ports; /** EDNS buffer size to use */ size_t edns_buffer_size; /** number of bytes buffer size for DNS messages */ size_t msg_buffer_size; /** size of the message cache */ size_t msg_cache_size; /** slabs in the message cache. */ size_t msg_cache_slabs; /** number of queries every thread can service */ size_t num_queries_per_thread; /** number of msec to wait before items can be jostled out */ size_t jostle_time; /** size of the rrset cache */ size_t rrset_cache_size; /** slabs in the rrset cache */ size_t rrset_cache_slabs; /** host cache ttl in seconds */ int host_ttl; /** number of slabs in the infra host cache */ size_t infra_cache_slabs; /** max number of hosts in the infra cache */ size_t infra_cache_numhosts; /** delay close of udp-timeouted ports, if 0 no delayclose. in msec */ int delay_close; /** the target fetch policy for the iterator */ char* target_fetch_policy; /** automatic interface for incoming messages. Uses ipv6 remapping, * and recvmsg/sendmsg ancillary data to detect interfaces, boolean */ int if_automatic; /** SO_RCVBUF size to set on port 53 UDP socket */ size_t so_rcvbuf; /** SO_SNDBUF size to set on port 53 UDP socket */ size_t so_sndbuf; /** SO_REUSEPORT requested on port 53 sockets */ int so_reuseport; /** number of interfaces to open. If 0 default all interfaces. */ int num_ifs; /** interface description strings (IP addresses) */ char **ifs; /** number of outgoing interfaces to open. * If 0 default all interfaces. */ int num_out_ifs; /** outgoing interface description strings (IP addresses) */ char **out_ifs; /** the root hints */ struct config_strlist* root_hints; /** the stub definitions, linked list */ struct config_stub* stubs; /** the forward zone definitions, linked list */ struct config_stub* forwards; /** list of donotquery addresses, linked list */ struct config_strlist* donotqueryaddrs; /** list of access control entries, linked list */ struct config_str2list* acls; /** use default localhost donotqueryaddr entries */ int donotquery_localhost; /** harden against very small edns buffer sizes */ int harden_short_bufsize; /** harden against very large query sizes */ int harden_large_queries; /** harden against spoofed glue (out of zone data) */ int harden_glue; /** harden against receiving no DNSSEC data for trust anchor */ int harden_dnssec_stripped; /** harden against queries that fall under known nxdomain names */ int harden_below_nxdomain; /** harden the referral path, query for NS,A,AAAA and validate */ int harden_referral_path; /** use 0x20 bits in query as random ID bits */ int use_caps_bits_for_id; /** strip away these private addrs from answers, no DNS Rebinding */ struct config_strlist* private_address; /** allow domain (and subdomains) to use private address space */ struct config_strlist* private_domain; /** what threshold for unwanted action. */ size_t unwanted_threshold; /** the number of seconds maximal TTL used for RRsets and messages */ int max_ttl; /** the number of seconds minimum TTL used for RRsets and messages */ int min_ttl; /** if prefetching of messages should be performed. */ int prefetch; /** if prefetching of DNSKEYs should be performed. */ int prefetch_key; /** chrootdir, if not "" or chroot will be done */ char* chrootdir; /** username to change to, if not "". */ char* username; /** working directory */ char* directory; /** filename to log to. */ char* logfile; /** pidfile to write pid to. */ char* pidfile; /** should log messages be sent to syslogd */ int use_syslog; /** log timestamp in ascii UTC */ int log_time_ascii; /** log queries with one line per query */ int log_queries; /** do not report identity (id.server, hostname.bind) */ int hide_identity; /** do not report version (version.server, version.bind) */ int hide_version; /** identity, hostname is returned if "". */ char* identity; /** version, package version returned if "". */ char* version; /** the module configuration string */ char* module_conf; /** files with trusted DS and DNSKEYs in zonefile format, list */ struct config_strlist* trust_anchor_file_list; /** list of trustanchor keys, linked list */ struct config_strlist* trust_anchor_list; /** files with 5011 autotrust tracked keys */ struct config_strlist* auto_trust_anchor_file_list; /** files with trusted DNSKEYs in named.conf format, list */ struct config_strlist* trusted_keys_file_list; /** DLV anchor file */ char* dlv_anchor_file; /** DLV anchor inline */ struct config_strlist* dlv_anchor_list; /** insecure domain list */ struct config_strlist* domain_insecure; /** if not 0, this value is the validation date for RRSIGs */ int32_t val_date_override; /** the minimum for signature clock skew */ int32_t val_sig_skew_min; /** the maximum for signature clock skew */ int32_t val_sig_skew_max; /** this value sets the number of seconds before revalidating bogus */ int bogus_ttl; /** should validator clean additional section for secure msgs */ int val_clean_additional; /** log bogus messages by the validator */ int val_log_level; /** squelch val_log_level to log - this is library goes to callback */ int val_log_squelch; /** should validator allow bogus messages to go through */ int val_permissive_mode; /** ignore the CD flag in incoming queries and refuse them bogus data */ int ignore_cd; /** nsec3 maximum iterations per key size, string */ char* val_nsec3_key_iterations; /** autotrust add holddown time, in seconds */ unsigned int add_holddown; /** autotrust del holddown time, in seconds */ unsigned int del_holddown; /** autotrust keep_missing time, in seconds. 0 is forever. */ unsigned int keep_missing; /** size of the key cache */ size_t key_cache_size; /** slabs in the key cache. */ size_t key_cache_slabs; /** size of the neg cache */ size_t neg_cache_size; /** local zones config */ struct config_str2list* local_zones; /** local zones nodefault list */ struct config_strlist* local_zones_nodefault; /** local data RRs configged */ struct config_strlist* local_data; /** unblock lan zones (reverse lookups for 10/8 and so on) */ int unblock_lan_zones; /** remote control section. enable toggle. */ int remote_control_enable; /** the interfaces the remote control should listen on */ struct config_strlist* control_ifs; /** port number for the control port */ int control_port; /** private key file for server */ char* server_key_file; /** certificate file for server */ char* server_cert_file; /** private key file for unbound-control */ char* control_key_file; /** certificate file for unbound-control */ char* control_cert_file; /** Python script file */ char* python_script; /** daemonize, i.e. fork into the background. */ int do_daemonize; /* minimal response when positive answer */ int minimal_responses; /* RRSet roundrobin */ int rrset_roundrobin; /* maximum UDP response size */ size_t max_udp_size; /* DNS64 prefix */ char* dns64_prefix; /* Synthetize all AAAA record despite the presence of an authoritative one */ int dns64_synthall; /** true to enable dnstap support */ int dnstap; /** dnstap socket path */ char* dnstap_socket_path; /** true to send "identity" via dnstap */ int dnstap_send_identity; /** true to send "version" via dnstap */ int dnstap_send_version; /** dnstap "identity", hostname is used if "". */ char* dnstap_identity; /** dnstap "version", package version is used if "". */ char* dnstap_version; /** true to log dnstap RESOLVER_QUERY message events */ int dnstap_log_resolver_query_messages; /** true to log dnstap RESOLVER_RESPONSE message events */ int dnstap_log_resolver_response_messages; /** true to log dnstap CLIENT_QUERY message events */ int dnstap_log_client_query_messages; /** true to log dnstap CLIENT_RESPONSE message events */ int dnstap_log_client_response_messages; /** true to log dnstap FORWARDER_QUERY message events */ int dnstap_log_forwarder_query_messages; /** true to log dnstap FORWARDER_RESPONSE message events */ int dnstap_log_forwarder_response_messages; }; /** * Stub config options */ struct config_stub { /** next in list */ struct config_stub* next; /** domain name (in text) of the stub apex domain */ char* name; /** list of stub nameserver hosts (domain name) */ struct config_strlist* hosts; /** list of stub nameserver addresses (IP address) */ struct config_strlist* addrs; /** if stub-prime is set */ int isprime; /** if forward-first is set (failover to without if fails) */ int isfirst; }; /** * List of strings for config options */ struct config_strlist { /** next item in list */ struct config_strlist* next; /** config option string */ char* str; }; /** * List of two strings for config options */ struct config_str2list { /** next item in list */ struct config_str2list* next; /** first string */ char* str; /** second string */ char* str2; }; /** List head for strlist processing, used for append operation. */ struct config_strlist_head { /** first in list of text items */ struct config_strlist* first; /** last in list of text items */ struct config_strlist* last; }; /** * Create config file structure. Filled with default values. * @return: the new structure or NULL on memory error. */ struct config_file* config_create(void); /** * Create config file structure for library use. Filled with default values. * @return: the new structure or NULL on memory error. */ struct config_file* config_create_forlib(void); /** * Read the config file from the specified filename. * @param config: where options are stored into, must be freshly created. * @param filename: name of configfile. If NULL nothing is done. * @param chroot: if not NULL, the chroot dir currently in use (for include). * @return: false on error. In that case errno is set, ENOENT means * file not found. */ int config_read(struct config_file* config, const char* filename, const char* chroot); /** * Destroy the config file structure. * @param config: to delete. */ void config_delete(struct config_file* config); /** * Apply config to global constants; this routine is called in single thread. * @param config: to apply. Side effect: global constants change. */ void config_apply(struct config_file* config); /** * Set the given keyword to the given value. * @param config: where to store config * @param option: option name, including the ':' character. * @param value: value, this string is copied if needed, or parsed. * The caller owns the value string. * @return 0 on error (malloc or syntax error). */ int config_set_option(struct config_file* config, const char* option, const char* value); /** * Call print routine for the given option. * @param cfg: config. * @param opt: option name without trailing :. * This is different from config_set_option. * @param func: print func, called as (str, arg) for every data element. * @param arg: user argument for print func. * @return false if the option name is not supported (syntax error). */ int config_get_option(struct config_file* cfg, const char* opt, void (*func)(char*,void*), void* arg); /** * Get an option and return strlist * @param cfg: config file * @param opt: option name. * @param list: list is returned here. malloced, caller must free it. * @return 0=OK, 1=syntax error, 2=malloc failed. */ int config_get_option_list(struct config_file* cfg, const char* opt, struct config_strlist** list); /** * Get an option and collate results into string * @param cfg: config file * @param opt: option name. * @param str: string. malloced, caller must free it. * @return 0=OK, 1=syntax error, 2=malloc failed. */ int config_get_option_collate(struct config_file* cfg, const char* opt, char** str); /** * function to print to a file, use as func with config_get_option. * @param line: text to print. \n appended. * @param arg: pass a FILE*, like stdout. */ void config_print_func(char* line, void* arg); /** * function to collate the text strings into a strlist_head. * @param line: text to append. * @param arg: pass a strlist_head structure. zeroed on start. */ void config_collate_func(char* line, void* arg); /** * take a strlist_head list and return a malloc string. separated with newline. * @param list: strlist first to collate. zeroes return "". * @return NULL on malloc failure. Or if malloc failure happened in strlist. */ char* config_collate_cat(struct config_strlist* list); /** * Append text at end of list. * @param list: list head. zeroed at start. * @param item: new item. malloced by caller. if NULL the insertion fails. * @return true on success. */ int cfg_strlist_append(struct config_strlist_head* list, char* item); /** * Insert string into strlist. * @param head: pointer to strlist head variable. * @param item: new item. malloced by caller. If NULL the insertion fails. * @return: true on success. */ int cfg_strlist_insert(struct config_strlist** head, char* item); /** * Insert string into str2list. * @param head: pointer to str2list head variable. * @param item: new item. malloced by caller. If NULL the insertion fails. * @param i2: 2nd string, malloced by caller. If NULL the insertion fails. * @return: true on success. */ int cfg_str2list_insert(struct config_str2list** head, char* item, char* i2); /** * Delete items in config string list. * @param list: list. */ void config_delstrlist(struct config_strlist* list); /** * Delete items in config double string list. * @param list: list. */ void config_deldblstrlist(struct config_str2list* list); /** * Delete items in config stub list. * @param list: list. */ void config_delstubs(struct config_stub* list); /** * Convert 14digit to time value * @param str: string of 14 digits * @return time value or 0 for error. */ time_t cfg_convert_timeval(const char* str); /** * Count number of values in the string. * format ::= (sp num)+ sp * num ::= [-](0-9)+ * sp ::= (space|tab)* * * @param str: string * @return: 0 on parse error, or empty string, else * number of integer values in the string. */ int cfg_count_numbers(const char* str); /** * Convert a 'nice' memory or file size into a bytecount * From '100k' to 102400. and so on. Understands kKmMgG. * k=1024, m=1024*1024, g=1024*1024*1024. * @param str: string * @param res: result is stored here, size in bytes. * @return: true if parsed correctly, or 0 on a parse error (and an error * is logged). */ int cfg_parse_memsize(const char* str, size_t* res); /** * Parse local-zone directive into two strings and register it in the config. * @param cfg: to put it in. * @param val: argument strings to local-zone, "example.com nodefault". * @return: false on failure */ int cfg_parse_local_zone(struct config_file* cfg, const char* val); /** * Mark "number" or "low-high" as available or not in ports array. * @param str: string in input * @param allow: give true if this range is permitted. * @param avail: the array from cfg. * @param num: size of the array (65536). * @return: true if parsed correctly, or 0 on a parse error (and an error * is logged). */ int cfg_mark_ports(const char* str, int allow, int* avail, int num); /** * Get a condensed list of ports returned. allocated. * @param cfg: config file. * @param avail: the available ports array is returned here. * @return: number of ports in array or 0 on error. */ int cfg_condense_ports(struct config_file* cfg, int** avail); /** * Scan ports available * @param avail: the array from cfg. * @param num: size of the array (65536). * @return the number of ports available for use. */ int cfg_scan_ports(int* avail, int num); /** * Convert a filename to full pathname in original filesys * @param fname: the path name to convert. * Must not be null or empty. * @param cfg: config struct for chroot and chdir (if set). * @param use_chdir: if false, only chroot is applied. * @return pointer to malloced buffer which is: [chroot][chdir]fname * or NULL on malloc failure. */ char* fname_after_chroot(const char* fname, struct config_file* cfg, int use_chdir); /** * Convert a ptr shorthand into a full reverse-notation PTR record. * @param str: input string, "IP name" * @return: malloced string "reversed-ip-name PTR name" */ char* cfg_ptr_reverse(char* str); /** * Append text to the error info for validation. * @param qstate: query state. * @param str: copied into query region and appended. * Failures to allocate are logged. */ void errinf(struct module_qstate* qstate, const char* str); /** * Append text to error info: from 1.2.3.4 * @param qstate: query state. * @param origin: sock list with origin of trouble. * Every element added. * If NULL: nothing is added. * if 0len element: 'from cache' is added. */ void errinf_origin(struct module_qstate* qstate, struct sock_list *origin); /** * Append text to error info: for RRset name type class * @param qstate: query state. * @param rr: rrset_key. */ void errinf_rrset(struct module_qstate* qstate, struct ub_packed_rrset_key *rr); /** * Append text to error info: str dname * @param qstate: query state. * @param str: explanation string * @param dname: the dname. */ void errinf_dname(struct module_qstate* qstate, const char* str, uint8_t* dname); /** * Create error info in string * @param qstate: query state. * @return string or NULL on malloc failure (already logged). * This string is malloced and has to be freed by caller. */ char* errinf_to_str(struct module_qstate* qstate); /** * Used during options parsing */ struct config_parser_state { /** name of file being parser */ char* filename; /** line number in the file, starts at 1 */ int line; /** number of errors encountered */ int errors; /** the result of parsing is stored here. */ struct config_file* cfg; /** the current chroot dir (or NULL if none) */ const char* chroot; }; /** global config parser object used during config parsing */ extern struct config_parser_state* cfg_parser; /** init lex state */ void init_cfg_parse(void); /** lex in file */ extern FILE* ub_c_in; /** lex out file */ extern FILE* ub_c_out; /** the yacc lex generated parse function */ int ub_c_parse(void); /** the lexer function */ int ub_c_lex(void); /** wrap function */ int ub_c_wrap(void); /** parsing helpers: print error with file and line numbers */ void ub_c_error(const char* msg); /** parsing helpers: print error with file and line numbers */ void ub_c_error_msg(const char* fmt, ...) ATTR_FORMAT(printf, 1, 2); #ifdef UB_ON_WINDOWS /** * Obtain registry string (if it exists). * @param key: key string * @param name: name of value to fetch. * @return malloced string with the result or NULL if it did not * exist on an error (logged with log_err) was encountered. */ char* w_lookup_reg_str(const char* key, const char* name); #endif /* UB_ON_WINDOWS */ #endif /* UTIL_CONFIG_FILE_H */