/*
* services/authzone.h - authoritative zone that is locally hosted.
*
* Copyright (c) 2017, 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 the functions for an authority zone. This zone
* is queried by the iterator, just like a stub or forward zone, but then
* the data is locally held.
*/
/**
* Authoritative zones, shared.
*/
struct auth_zones {
/** lock on the authzone trees. It is locked after views, respip,
* local_zones and before fwds and stubs. */
lock_rw_type lock;
/** rbtree of struct auth_zone */
rbtree_type ztree;
/** rbtree of struct auth_xfer */
rbtree_type xtree;
/** do we have downstream enabled */
int have_downstream;
/** first auth zone containing rpz item in linked list */
struct auth_zone* rpz_first;
/** rw lock for rpz linked list, needed when iterating or editing linked
* list. */
lock_rw_type rpz_lock;
};
/**
* Auth zone. Authoritative data, that is fetched from instead of sending
* packets to the internet.
*/
struct auth_zone {
/** rbtree node, key is name and class */
rbnode_type node;
/** zone name, in uncompressed wireformat */
uint8_t* name;
/** length of zone name */
size_t namelen;
/** number of labels in zone name */
int namelabs;
/** the class of this zone, in host byteorder.
* uses 'dclass' to not conflict with c++ keyword class. */
uint16_t dclass;
/** lock on the data in the structure
* For the node, parent, name, namelen, namelabs, dclass, you
* need to also hold the zones_tree lock to change them (or to
* delete this zone) */
lock_rw_type lock;
/** auth data for this zone
* rbtree of struct auth_data */
rbtree_type data;
/** zonefile name (or NULL for no zonefile) */
char* zonefile;
/** fallback to the internet on failure or ttl-expiry of auth zone */
int fallback_enabled;
/** the zone has expired (enabled by the xfer worker), fallback
* happens if that option is enabled. */
int zone_expired;
/** zone is a slave zone (it has masters) */
int zone_is_slave;
/** for downstream: this zone answers queries towards the downstream
* clients */
int for_downstream;
/** for upstream: this zone answers queries that unbound intends to
* send upstream. */
int for_upstream;
/** check ZONEMD records */
int zonemd_check;
/** reject absence of ZONEMD records */
int zonemd_reject_absence;
/** RPZ zones */
struct rpz* rpz;
/** store the env (worker thread specific) for the zonemd callbacks
* from the mesh with the results of the lookup, if nonNULL, some
* worker has already picked up the zonemd verification task and
* this worker does not have to do it as well. */
struct module_env* zonemd_callback_env;
/** for the zonemd callback, the type of data looked up */
uint16_t zonemd_callback_qtype;
/** zone has been deleted */
int zone_deleted;
/** deletelist pointer, unused normally except during delete */
struct auth_zone* delete_next;
/* not protected by auth_zone lock, must be last items in struct */
/** next auth zone containing RPZ data, or NULL */
struct auth_zone* rpz_az_next;
/** previous auth zone containing RPZ data, or NULL */
struct auth_zone* rpz_az_prev;
};
/**
* Auth data. One domain name, and the RRs to go with it.
*/
struct auth_data {
/** rbtree node, key is name only */
rbnode_type node;
/** domain name */
uint8_t* name;
/** length of name */
size_t namelen;
/** number of labels in name */
int namelabs;
/** the data rrsets, with different types, linked list.
* if the list if NULL the node would be an empty non-terminal,
* but in this data structure such nodes that represent an empty
* non-terminal are not needed; they just don't exist.
*/
struct auth_rrset* rrsets;
};
/**
* A auth data RRset
*/
struct auth_rrset {
/** next in list */
struct auth_rrset* next;
/** RR type in host byteorder */
uint16_t type;
/** RRset data item */
struct packed_rrset_data* data;
};
/**
* Authoritative zone transfer structure.
* Create and destroy needs the auth_zones* biglock.
* The structure consists of different tasks. Each can be unowned (-1) or
* owner by a worker (worker-num). A worker can pick up a task and then do
* it. This means the events (timeouts, sockets) are for that worker.
*
* (move this to tasks).
* They don't have locks themselves, the worker (that owns it) uses it,
* also as part of callbacks, hence it has separate zonename pointers for
* lookup in the main zonetree. If the zone has no transfers, this
* structure is not created.
*/
struct auth_xfer {
/** rbtree node, key is name and class */
rbnode_type node;
/** lock on this structure, and on the workernum elements of the
* tasks. First hold the tree-lock in auth_zones, find the auth_xfer,
* lock this lock. Then a worker can reassign itself to fill up
* one of the tasks.
* Once it has the task assigned to it, the worker can access the
* other elements of the task structure without a lock, because that
* is necessary for the eventloop and callbacks from that.
* The auth_zone->lock is locked before this lock.
*/
lock_basic_type lock;
/** zone name, in uncompressed wireformat */
uint8_t* name;
/** length of zone name */
size_t namelen;
/** number of labels in zone name */
int namelabs;
/** the class of this zone, in host byteorder.
* uses 'dclass' to not conflict with c++ keyword class. */
uint16_t dclass;
/** task to wait for next-probe-timeout,
* once timeouted, see if a SOA probe is needed, or already
* in progress */
struct auth_nextprobe* task_nextprobe;
/** task for SOA probe. Check if the zone can be updated */
struct auth_probe* task_probe;
/** Task for transfer. Transferring and updating the zone. This
* includes trying (potentially) several upstream masters. Downloading
* and storing the zone */
struct auth_transfer* task_transfer;
/** a notify was received, but a zone transfer or probe was already
* acted on.
* However, the zone transfer could signal a newer serial number.
* The serial number of that notify is saved below. The transfer and
* probe tasks should check this once done to see if they need to
* restart the transfer task for the newer notify serial.
* Hold the lock to access this member (and the serial).
*/
int notify_received;
/** true if the notify_received has a serial number */
int notify_has_serial;
/** serial number of the notify */
uint32_t notify_serial;
/** the list of masters for checking notifies. This list is
* empty on start, and a copy of the list from the probe_task when
* it is done looking them up. */
struct auth_master* allow_notify_list;
/* protected by the lock on the structure, information about
* the loaded authority zone. */
/** is the zone currently considered expired? after expiry also older
* serial numbers are allowed (not just newer) */
int zone_expired;
/** do we have a zone (if 0, no zone data at all) */
int have_zone;
/** current serial (from SOA), if we have no zone, 0 */
uint32_t serial;
/** retry time (from SOA), time to wait with next_probe
* if no master responds */
time_t retry;
/** refresh time (from SOA), time to wait with next_probe
* if everything is fine */
time_t refresh;
/** expiry time (from SOA), time until zone data is not considered
* valid any more, if no master responds within this time, either
* with the current zone or a new zone. */
time_t expiry;
/** zone lease start time (start+expiry is expiration time).
* this is renewed every SOA probe and transfer. On zone load
* from zonefile it is also set (with probe set soon to check) */
time_t lease_time;
};
/**
* The next probe task.
* This task consists of waiting for the probetimeout. It is a task because
* it needs an event in the eventtable. Once the timeout has passed, that
* worker can (potentially) become the auth_probe worker, or if another worker
* is already doing that, do nothing. Tasks becomes unowned.
* The probe worker, if it detects nothing has to be done picks up this task,
* if unowned.
*/
struct auth_nextprobe {
/* Worker pointer. NULL means unowned. */
struct worker* worker;
/* module env for this task */
struct module_env* env;
/** increasing backoff for failures */
time_t backoff;
/** Timeout for next probe (for SOA) */
time_t next_probe;
/** timeout callback for next_probe or expiry(if that is sooner).
* it is on the worker's event_base */
struct comm_timer* timer;
};
/**
* The probe task.
* Send a SOA UDP query to see if the zone needs to be updated (or similar,
* potential, HTTP probe query) and check serial number.
* If yes, start the auth_transfer task. If no, make sure auth_nextprobe
* timeout wait task is running.
* Needs to be a task, because the UDP query needs an event entry.
* This task could also be started by eg. a NOTIFY being received, even though
* another worker is performing the nextprobe task (and that worker keeps
* waiting uninterrupted).
*/
struct auth_probe {
/* Worker pointer. NULL means unowned. */
struct worker* worker;
/* module env for this task */
struct module_env* env;
/** list of upstream masters for this zone, from config */
struct auth_master* masters;
/** for the hostname lookups, which master is current */
struct auth_master* lookup_target;
/** are we looking up A or AAAA, first A, then AAAA (if ip6 enabled) */
int lookup_aaaa;
/** we only want to do lookups for making config work (for notify),
* don't proceed with UDP SOA probe queries */
int only_lookup;
/** we have seen a new lease this scan, because one of the masters
* replied with the current SOA serial version */
int have_new_lease;
/** once notified, or the timeout has been reached. a scan starts. */
/** the scan specific target (notify source), or NULL if none */
struct auth_master* scan_specific;
/** scan tries all the upstream masters. the scan current target.
* or NULL if not working on sequential scan */
struct auth_master* scan_target;
/** if not NULL, the specific addr for the current master */
struct auth_addr* scan_addr;
/** dns id of packet in flight */
uint16_t id;
/** the SOA probe udp event.
* on the workers event base. */
struct comm_point* cp;
/** is the cp for ip6 or ip4 */
int cp_is_ip6;
/** timeout for packets.
* on the workers event base. */
struct comm_timer* timer;
/** timeout in msec */
int timeout;
};
/**
* The transfer task.
* Once done, make sure the nextprobe waiting task is running, whether done
* with failure or success. If failure, use shorter timeout for wait time.
*/
struct auth_transfer {
/* Worker pointer. NULL means unowned. */
struct worker* worker;
/* module env for this task */
struct module_env* env;
/** xfer data that has been transferred, the data is applied
* once the transfer has completed correctly */
struct auth_chunk* chunks_first;
/** last element in chunks list (to append new data at the end) */
struct auth_chunk* chunks_last;
/** list of upstream masters for this zone, from config */
struct auth_master* masters;
/** for the hostname lookups, which master is current */
struct auth_master* lookup_target;
/** are we looking up A or AAAA, first A, then AAAA (if ip6 enabled) */
int lookup_aaaa;
/** once notified, or the timeout has been reached. a scan starts. */
/** the scan specific target (notify source), or NULL if none */
struct auth_master* scan_specific;
/** scan tries all the upstream masters. the scan current target.
* or NULL if not working on sequential scan */
struct auth_master* scan_target;
/** what address we are scanning for the master, or NULL if the
* master is in IP format itself */
struct auth_addr* scan_addr;
/** the zone transfer in progress (or NULL if in scan). It is
* from this master */
struct auth_master* master;
/** failed ixfr transfer, retry with axfr (to the current master),
* the IXFR was 'REFUSED', 'SERVFAIL', 'NOTIMPL' or the contents of
* the IXFR did not apply cleanly (out of sync, delete of nonexistent
* data or add of duplicate data). Flag is cleared once the retry
* with axfr is done. */
int ixfr_fail;
/** we saw an ixfr-indicating timeout, count of them */
int ixfr_possible_timeout_count;
/** we are doing IXFR right now */
int on_ixfr;
/** did we detect the current AXFR/IXFR serial number yet, 0 not yet,
* 1 we saw the first, 2 we saw the second, 3 must be last SOA in xfr*/
int got_xfr_serial;
/** number of RRs scanned for AXFR/IXFR detection */
size_t rr_scan_num;
/** we are doing an IXFR but we detected an AXFR contents */
int on_ixfr_is_axfr;
/** the serial number for the current AXFR/IXFR incoming reply,
* for IXFR, the outermost SOA records serial */
uint32_t incoming_xfr_serial;
/** dns id of AXFR query */
uint16_t id;
/** the transfer (TCP) to the master.
* on the workers event base. */
struct comm_point* cp;
/** timeout for the transfer.
* on the workers event base. */
struct comm_timer* timer;
};
/** list of addresses */
struct auth_addr {
/** next in list */
struct auth_addr* next;
/** IP address */
struct sockaddr_storage addr;
/** addr length */
socklen_t addrlen;
};
/** auth zone master upstream, and the config settings for it */
struct auth_master {
/** next master in list */
struct auth_master* next;
/** master IP address (and port), or hostname, string */
char* host;
/** for http, filename */
char* file;
/** use HTTP for this master */
int http;
/** use IXFR for this master */
int ixfr;
/** this is an allow notify member, the master can send notifies
* to us, but we don't send SOA probes, or zone transfer from it */
int allow_notify;
/** use ssl for channel */
int ssl;
/** the port number (for urls) */
int port;
/** if the host is a hostname, the list of resolved addrs, if any*/
struct auth_addr* list;
};
/** auth zone master zone transfer data chunk */
struct auth_chunk {
/** next chunk in list */
struct auth_chunk* next;
/** the data from this chunk, this is what was received.
* for an IXFR that means results from comm_net tcp actions,
* packets. also for an AXFR. For HTTP a zonefile chunk. */
uint8_t* data;
/** length of allocated data */
size_t len;
};
/**
* Create auth zones structure
*/
struct auth_zones* auth_zones_create(void);
/**
* Apply configuration to auth zones. Reads zonefiles.
* @param az: auth zones structure
* @param cfg: config to apply.
* @param setup: if true, also sets up values in the auth zones structure
* @param is_rpz: set to 1 if at least one RPZ zone is configured.
* @param env: environment for offline verification.
* @param mods: modules in environment.
* @return false on failure.
*/
int auth_zones_apply_cfg(struct auth_zones* az, struct config_file* cfg,
int setup, int* is_rpz, struct module_env* env,
struct module_stack* mods);
/** initial pick up of worker timeouts, ties events to worker event loop
* @param az: auth zones structure
* @param env: worker env, of first worker that receives the events (if any)
* in its eventloop.
*/
void auth_xfer_pickup_initial(struct auth_zones* az, struct module_env* env);
/**
* Cleanup auth zones. This removes all events from event bases.
* Stops the xfr tasks. But leaves zone data.
* @param az: auth zones structure.
*/
void auth_zones_cleanup(struct auth_zones* az);
/**
* Write auth zone data to file, in zonefile format.
*/
int auth_zone_write_file(struct auth_zone* z, const char* fname);
/**
* Use auth zones to lookup the answer to a query.
* The query is from the iterator. And the auth zones attempts to provide
* the answer instead of going to the internet.
*
* @param az: auth zones structure.
* @param qinfo: query info to lookup.
* @param region: region to use to allocate the reply in.
* @param msg: reply is stored here (if one).
* @param fallback: if true, fallback to making a query to the internet.
* @param dp_nm: name of delegation point to look for. This zone is used
* to answer the query.
* If the dp_nm is not found, fallback is set to true and false returned.
* @param dp_nmlen: length of dp_nm.
* @return 0: failure (an error of some sort, like servfail).
* if 0 and fallback is true, fallback to the internet.
* if 0 and fallback is false, like getting servfail.
* If true, an answer is available.
*/
int auth_zones_lookup(struct auth_zones* az, struct query_info* qinfo,
struct regional* region, struct dns_msg** msg, int* fallback,
uint8_t* dp_nm, size_t dp_nmlen);
/**
* Answer query from auth zone. Create authoritative answer.
* @param az: auth zones structure.
* @param env: the module environment.
* @param qinfo: query info (parsed).
* @param edns: edns info (parsed).
* @param buf: buffer with query ID and flags, also for reply.
* @param repinfo: reply information for a communication point.
* @param temp: temporary storage region.
* @return false if not answered
*/
int auth_zones_answer(struct auth_zones* az, struct module_env* env,
struct query_info* qinfo, struct edns_data* edns,
struct comm_reply* repinfo, struct sldns_buffer* buf, struct regional* temp);
/**
* Find the auth zone that is above the given qname.
* Return NULL when there is no auth_zone above the give name, otherwise
* returns the closest auth_zone above the qname that pertains to it.
* @param az: auth zones structure.
* @param name: query to look up for.
* @param name_len: length of name.
* @param dclass: class of zone to find.
* @return NULL or auth_zone that pertains to the query.
*/
struct auth_zone* auth_zones_find_zone(struct auth_zones* az,
uint8_t* name, size_t name_len, uint16_t dclass);
/** find an auth zone by name (exact match by name or NULL returned) */
struct auth_zone* auth_zone_find(struct auth_zones* az, uint8_t* nm,
size_t nmlen, uint16_t dclass);
/** find an xfer zone by name (exact match by name or NULL returned) */
struct auth_xfer* auth_xfer_find(struct auth_zones* az, uint8_t* nm,
size_t nmlen, uint16_t dclass);
/** create an auth zone. returns wrlocked zone. caller must have wrlock
* on az. returns NULL on malloc failure */
struct auth_zone* auth_zone_create(struct auth_zones* az, uint8_t* nm,
size_t nmlen, uint16_t dclass);
/** set auth zone zonefile string. caller must have lock on zone */
int auth_zone_set_zonefile(struct auth_zone* z, char* zonefile);
/** set auth zone fallback. caller must have lock on zone.
* fallbackstr is "yes" or "no". false on parse failure. */
int auth_zone_set_fallback(struct auth_zone* z, char* fallbackstr);
/** see if the auth zone for the name can fallback
* @param az: auth zones
* @param nm: name of delegation point.
* @param nmlen: length of nm.
* @param dclass: class of zone to look for.
* @return true if fallback_enabled is true. false if not.
* if the zone does not exist, fallback is true (more lenient)
* also true if zone does not do upstream requests.
*/
int auth_zones_can_fallback(struct auth_zones* az, uint8_t* nm, size_t nmlen,
uint16_t dclass);
/** process notify for auth zones.
* first checks the access list. Then processes the notify. This starts
* the probe sequence or it notes the serial number (if any)
* @param az: auth zones structure.
* @param env: module env of the worker that is handling the notify. it will
* pick up the task probe (or transfer), unless already in progress by
* another worker.
* @param nm: name of the zone. Uncompressed. from query.
* @param nmlen: length of name.
* @param dclass: class of zone.
* @param addr: source address of notify
* @param addrlen: length of addr.
* @param has_serial: if true, the notify has a serial attached.
* @param serial: the serial number, if has_serial is true.
* @param refused: is set to true on failure to note refused access.
* @return fail on failures (refused is false) and when access is
* denied (refused is true). True when processed.
*/
int auth_zones_notify(struct auth_zones* az, struct module_env* env,
uint8_t* nm, size_t nmlen, uint16_t dclass,
struct sockaddr_storage* addr, socklen_t addrlen, int has_serial,
uint32_t serial, int* refused);
/** process notify packet and read serial number from SOA.
* returns 0 if no soa record in the notify */
int auth_zone_parse_notify_serial(struct sldns_buffer* pkt, uint32_t *serial);
/** for the zone and if not already going, starts the probe sequence.
* false if zone cannot be found. This is like a notify arrived and was
* accepted for that zone. */
int auth_zones_startprobesequence(struct auth_zones* az,
struct module_env* env, uint8_t* nm, size_t nmlen, uint16_t dclass);
/** read auth zone from zonefile. caller must lock zone. false on failure */
int auth_zone_read_zonefile(struct auth_zone* z, struct config_file* cfg);
/** find the apex SOA RRset, if it exists. NULL if no SOA RRset. */
struct auth_rrset* auth_zone_get_soa_rrset(struct auth_zone* z);
/** find serial number of zone or false if none (no SOA record) */
int auth_zone_get_serial(struct auth_zone* z, uint32_t* serial);
/** Find auth_zone SOA and populate the values in xfr(soa values). */
int xfr_find_soa(struct auth_zone* z, struct auth_xfer* xfr);
/** compare auth_zones for sorted rbtree */
int auth_zone_cmp(const void* z1, const void* z2);
/** compare auth_data for sorted rbtree */
int auth_data_cmp(const void* z1, const void* z2);
/** compare auth_xfer for sorted rbtree */
int auth_xfer_cmp(const void* z1, const void* z2);
/** Create auth_xfer structure.
* Caller must have wrlock on az. Returns locked xfer zone.
* @param az: zones structure.
* @param z: zone with name and class
* @return xfer zone or NULL
*/
struct auth_xfer* auth_xfer_create(struct auth_zones* az, struct auth_zone* z);
/**
* Set masters in auth xfer structure from config.
* @param list: pointer to start of list. The malloced list is returned here.
* @param c: the config items to copy over.
* @param with_http: if true, http urls are also included, before the masters.
* @return false on failure.
*/
int xfer_set_masters(struct auth_master** list, struct config_auth* c,
int with_http);
/** xfer nextprobe timeout callback, this is part of task_nextprobe */
void auth_xfer_timer(void* arg);
/** callback for commpoint udp replies to task_probe */
int auth_xfer_probe_udp_callback(struct comm_point* c, void* arg, int err,
struct comm_reply* repinfo);
/** callback for task_transfer tcp connections */
int auth_xfer_transfer_tcp_callback(struct comm_point* c, void* arg, int err,
struct comm_reply* repinfo);
/** callback for task_transfer http connections */
int auth_xfer_transfer_http_callback(struct comm_point* c, void* arg, int err,
struct comm_reply* repinfo);
/** xfer probe timeout callback, part of task_probe */
void auth_xfer_probe_timer_callback(void* arg);
/** xfer transfer timeout callback, part of task_transfer */
void auth_xfer_transfer_timer_callback(void* arg);
/** mesh callback for task_probe on lookup of host names */
void auth_xfer_probe_lookup_callback(void* arg, int rcode,
struct sldns_buffer* buf, enum sec_status sec, char* why_bogus,
int was_ratelimited);
/** mesh callback for task_transfer on lookup of host names */
void auth_xfer_transfer_lookup_callback(void* arg, int rcode,
struct sldns_buffer* buf, enum sec_status sec, char* why_bogus,
int was_ratelimited);
/*
* Compares two 32-bit serial numbers as defined in RFC1982. Returns
* <0 if a < b, 0 if a == b, and >0 if a > b. The result is undefined
* if a != b but neither is greater or smaller (see RFC1982 section
* 3.2.).
*/
int compare_serial(uint32_t a, uint32_t b);
/**
* Generate ZONEMD digest for the auth zone.
* @param z: the auth zone to digest.
* omits zonemd at apex and its RRSIG from the digest.
* @param scheme: the collation scheme to use. Numbers as defined for ZONEMD.
* @param hashalgo: the hash algo, from the registry defined for ZONEMD type.
* @param hash: the result buffer.
* @param buflen: size of the result buffer, must be large enough. or the
* routine fails.
* @param resultlen: size of the hash in the result buffer of the result.
* @param region: temp region for allocs during canonicalisation.
* @param buf: temp buffer during canonicalisation.
* @param reason: failure reason, returns a string, NULL on success.
* @return false on failure.
*/
int auth_zone_generate_zonemd_hash(struct auth_zone* z, int scheme,
int hashalgo, uint8_t* hash, size_t buflen, size_t* resultlen,
struct regional* region, struct sldns_buffer* buf, char** reason);
/** returns true if a zonemd hash algo is supported */
int zonemd_hashalgo_supported(int hashalgo);
/** returns true if a zonemd scheme is supported */
int zonemd_scheme_supported(int scheme);
/**
* Check ZONEMD digest for the auth zone.
* @param z: auth zone to digest.
* @param scheme: zonemd scheme.
* @param hashalgo: zonemd hash algorithm.
* @param hash: the hash to check.
* @param hashlen: length of hash buffer.
* @param region: temp region for allocs during canonicalisation.
* @param buf: temp buffer during canonicalisation.
* @param reason: string returned with failure reason.
* If the hash cannot be checked, but it is allowed, for unknown
* algorithms, the routine returns success, and the reason is nonNULL,
* with the allowance reason.
* @return false on failure.
*/
int auth_zone_generate_zonemd_check(struct auth_zone* z, int scheme,
int hashalgo, uint8_t* hash, size_t hashlen, struct regional* region,
struct sldns_buffer* buf, char** reason);
/**
* Perform ZONEMD checks and verification for the auth zone.
* This includes DNSSEC verification if applicable.
* @param z: auth zone to check. Caller holds lock. wrlock.
* @param env: with temp region, buffer and config.
* @param mods: module stack for validator env.
* @param result: if not NULL, result string strdupped in here.
* @param offline: if true, there is no spawned lookup when online is needed.
* Those zones are skipped for ZONEMD checking.
* @param only_online: if true, only for ZONEMD that need online lookup
* of DNSKEY chain of trust are processed.
*/
void auth_zone_verify_zonemd(struct auth_zone* z, struct module_env* env,
struct module_stack* mods, char** result, int offline,
int only_online);
/** mesh callback for zonemd on lookup of dnskey */
void auth_zonemd_dnskey_lookup_callback(void* arg, int rcode,
struct sldns_buffer* buf, enum sec_status sec, char* why_bogus,
int was_ratelimited);
/**
* Check the ZONEMD records that need online DNSSEC chain lookups,
* for them spawn the lookup process to get it checked out.
* Attaches the lookup process to the worker event base and mesh state.
* @param az: auth zones, every zones is checked.
* @param env: env of the worker where the task is attached.
*/
void auth_zones_pickup_zonemd_verify(struct auth_zones* az,
struct module_env* env);
/** Get memory usage for auth zones. The routine locks and unlocks
* for reading. */
size_t auth_zones_get_mem(struct auth_zones* zones);
/**
* Initial pick up of the auth zone nextprobe timeout and that turns
* into further zone transfer work, if any. Also sets the lease time.
* @param x: xfer structure, locked by caller.
* @param env: environment of the worker that picks up the task.
*/
void auth_xfer_pickup_initial_zone(struct auth_xfer* x,
struct module_env* env);
/**
* Delete auth xfer structure
* @param xfr: delete this xfer and its tasks.
*/
void auth_xfer_delete(struct auth_xfer* xfr);
/**
* Disown tasks from the xfr that belong to this worker.
* Only tasks for the worker in question, the comm point and timer
* delete functions need to run in the thread of that worker to be
* able to delete the callback from the event base.
* @param xfr: xfr structure
* @param worker: the worker for which to stop tasks.
*/
void xfr_disown_tasks(struct auth_xfer* xfr, struct worker* worker);
