/*
* 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;
/** min value for infra cache rtt */
int infra_cache_min_rtt;
/** 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;
/** IP_TRANSPARENT socket option requested on port 53 sockets */
int ip_transparent;
/** 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;
/** harden against algorithm downgrade */
int harden_algo_downgrade;
/** 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;
/** use certificates for remote control */
int remote_control_use_cert;
/** 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;
};
/** from cfg username, after daemonise setup performed */
extern uid_t cfg_uid;
/** from cfg username, after daemonise setup performed */
extern gid_t cfg_gid;
/**
* 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);
/**
* Find username, sets cfg_uid and cfg_gid.
* @param config: the config structure.
*/
void config_lookup_uid(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 */
