Functions
libunbound.c File Reference

This file contains functions to resolve DNS queries and validate the answers. More...

#include "libunbound/unbound.h"
#include "libunbound/unbound-event.h"
#include "config.h"
#include <ctype.h>
#include "libunbound/context.h"
#include "libunbound/libworker.h"
#include "util/locks.h"
#include "util/config_file.h"
#include "util/alloc.h"
#include "util/module.h"
#include "util/regional.h"
#include "util/log.h"
#include "util/random.h"
#include "util/net_help.h"
#include "util/tube.h"
#include "services/modstack.h"
#include "services/localzone.h"
#include "services/cache/infra.h"
#include "services/cache/rrset.h"
#include "ldns/sbuffer.h"

Functions

static struct ub_ctxub_ctx_create_nopipe (void)
 create context functionality, but no pipes
 
struct ub_ctxub_ctx_create (void)
 Create a resolving and validation context. More...
 
struct ub_ctxub_ctx_create_event (struct event_base *eb)
 Create a resolving and validation context. More...
 
static void delq (rbnode_t *n, void *ATTR_UNUSED(arg))
 delete q
 
static void ub_stop_bg (struct ub_ctx *ctx)
 stop the bg thread
 
void ub_ctx_delete (struct ub_ctx *ctx)
 Destroy a validation context and free all its resources. More...
 
int ub_ctx_set_option (struct ub_ctx *ctx, const char *opt, const char *val)
 Set an option for the context. More...
 
int ub_ctx_get_option (struct ub_ctx *ctx, const char *opt, char **str)
 Get an option from the context. More...
 
int ub_ctx_config (struct ub_ctx *ctx, const char *fname)
 setup configuration for the given context. More...
 
int ub_ctx_add_ta (struct ub_ctx *ctx, const char *ta)
 Add a trust anchor to the given context. More...
 
int ub_ctx_add_ta_file (struct ub_ctx *ctx, const char *fname)
 Add trust anchors to the given context. More...
 
int ub_ctx_add_ta_autr (struct ub_ctx *ctx, const char *fname)
 Add trust anchor to the give context that is tracked with RFC5011 automated trust anchor maintenance. More...
 
int ub_ctx_trustedkeys (struct ub_ctx *ctx, const char *fname)
 Add trust anchors to the given context. More...
 
int ub_ctx_debuglevel (struct ub_ctx *ctx, int d)
 Set debug verbosity for the context Output is directed to stderr. More...
 
int ub_ctx_debugout (struct ub_ctx *ctx, void *out)
 Set debug output (and error output) to the specified stream. More...
 
int ub_ctx_async (struct ub_ctx *ctx, int dothread)
 Set a context behaviour for asynchronous action. More...
 
int ub_poll (struct ub_ctx *ctx)
 Poll a context to see if it has any new results Do not poll in a loop, instead extract the fd below to poll for readiness, and then check, or wait using the wait routine. More...
 
int ub_fd (struct ub_ctx *ctx)
 Get file descriptor. More...
 
static int process_answer_detail (struct ub_ctx *ctx, uint8_t *msg, uint32_t len, ub_callback_t *cb, void **cbarg, int *err, struct ub_result **res)
 process answer from bg worker
 
static int process_answer (struct ub_ctx *ctx, uint8_t *msg, uint32_t len)
 process answer from bg worker
 
int ub_process (struct ub_ctx *ctx)
 Call this routine to continue processing results from the validating resolver (when the fd becomes readable). More...
 
int ub_wait (struct ub_ctx *ctx)
 Wait for a context to finish with results. More...
 
int ub_resolve (struct ub_ctx *ctx, const char *name, int rrtype, int rrclass, struct ub_result **result)
 Perform resolution and validation of the target name. More...
 
int ub_resolve_event (struct ub_ctx *ctx, const char *name, int rrtype, int rrclass, void *mydata, ub_event_callback_t callback, int *async_id)
 Perform resolution and validation of the target name. More...
 
int ub_resolve_async (struct ub_ctx *ctx, const char *name, int rrtype, int rrclass, void *mydata, ub_callback_t callback, int *async_id)
 Perform resolution and validation of the target name. More...
 
int ub_cancel (struct ub_ctx *ctx, int async_id)
 Cancel an async query in progress. More...
 
void ub_resolve_free (struct ub_result *result)
 Free storage associated with a result structure. More...
 
const char * ub_strerror (int err)
 Convert error value to a human readable string. More...
 
int ub_ctx_set_fwd (struct ub_ctx *ctx, const char *addr)
 Set machine to forward DNS queries to, the caching resolver to use. More...
 
int ub_ctx_resolvconf (struct ub_ctx *ctx, const char *fname)
 Read list of nameservers to use from the filename given. More...
 
int ub_ctx_hosts (struct ub_ctx *ctx, const char *fname)
 Read list of hosts from the filename given. More...
 
static int ub_ctx_finalize (struct ub_ctx *ctx)
 finalize the context, if not already finalized
 
int ub_ctx_print_local_zones (struct ub_ctx *ctx)
 Debug routine. More...
 
int ub_ctx_zone_add (struct ub_ctx *ctx, const char *zone_name, const char *zone_type)
 Add a new zone with the zonetype to the local authority info of the library. More...
 
int ub_ctx_zone_remove (struct ub_ctx *ctx, const char *zone_name)
 Remove zone from local authority info of the library. More...
 
int ub_ctx_data_add (struct ub_ctx *ctx, const char *data)
 Add localdata to the library local authority info. More...
 
int ub_ctx_data_remove (struct ub_ctx *ctx, const char *data)
 Remove localdata from the library local authority info. More...
 
const char * ub_version (void)
 Get a version string from the libunbound implementation. More...
 
int ub_ctx_set_event (struct ub_ctx *ctx, struct event_base *base)
 Set a new event_base on a context created with ub_ctx_create_event. More...
 

Detailed Description

This file contains functions to resolve DNS queries and validate the answers.

Synchonously and asynchronously.

Function Documentation

struct ub_ctx* ub_ctx_create ( void  )

Create a resolving and validation context.

The information from /etc/resolv.conf and /etc/hosts is not utilised by default. Use ub_ctx_resolvconf and ub_ctx_hosts to read them.

Returns
a new context. default initialisation. returns NULL on error.

References module_env::cfg, config_delete(), ub_ctx::env, ub_ctx::mods, modstack_desetup(), ub_ctx::qq_pipe, ub_ctx::rr_pipe, ub_ctx::seed_rnd, tube_create(), tube_delete(), ub_ctx_create_nopipe(), and ub_randfree().

Referenced by create_unbound_context(), do_update(), and main().

struct ub_ctx* ub_ctx_create_event ( struct event_base *  base)

Create a resolving and validation context.

The information from /etc/resolv.conf and /etc/hosts is not utilised by default. Use ub_ctx_resolvconf and ub_ctx_hosts to read them.

Parameters
basethe event base that the caller has created. The unbound context uses this event base.
Returns
a new context. default initialisation. returns NULL on error. You must use ub_resolve_event with this context. Do not call ub_ctx_async, ub_poll, ub_wait, ub_process, this is all done with the event_base. Setup the options you like with the other functions.

References ub_ctx::created_bg, ub_ctx::dothread, ub_ctx::event_base, and ub_ctx_create_nopipe().

void ub_ctx_delete ( struct ub_ctx ctx)
int ub_ctx_set_option ( struct ub_ctx ctx,
const char *  opt,
const char *  val 
)

Set an option for the context.

Parameters
ctxcontext.
optoption name from the unbound.conf config file format. (not all settings applicable). The name includes the trailing ':' for example ub_ctx_set_option(ctx, "logfile:", "mylog.txt"); This is a power-users interface that lets you specify all sorts of options. For some specific options, such as adding trust anchors, special routines exist.
valvalue of the option.
Returns
: 0 if OK, else error.

References module_env::cfg, ub_ctx::cfglock, config_set_option(), ub_ctx::env, ub_ctx::finalized, UB_AFTERFINAL, UB_NOERROR, and UB_SYNTAX.

Referenced by add_5011_probe_root(), create_unbound_context(), and main().

int ub_ctx_get_option ( struct ub_ctx ctx,
const char *  opt,
char **  str 
)

Get an option from the context.

Parameters
ctxcontext.
optoption name from the unbound.conf config file format. (not all settings applicable). The name excludes the trailing ':' for example ub_ctx_get_option(ctx, "logfile", &result); This is a power-users interface that lets you specify all sorts of options.
strthe string is malloced and returned here. NULL on error. The caller must free() the string. In cases with multiple entries (auto-trust-anchor-file), a newline delimited list is returned in the string.
Returns
0 if OK else an error code (malloc failure, syntax error).

References module_env::cfg, ub_ctx::cfglock, config_get_option_collate(), ub_ctx::env, UB_NOERROR, UB_NOMEM, and UB_SYNTAX.

Referenced by main().

int ub_ctx_config ( struct ub_ctx ctx,
const char *  fname 
)

setup configuration for the given context.

Parameters
ctxcontext.
fnameunbound config file (not all settings applicable). This is a power-users interface that lets you specify all sorts of options. For some specific options, such as adding trust anchors, special routines exist.
Returns
: 0 if OK, else error.

References module_env::cfg, ub_ctx::cfglock, config_read(), ub_ctx::env, ub_ctx::finalized, UB_AFTERFINAL, UB_NOERROR, and UB_SYNTAX.

Referenced by create_unbound_context(), and main().

int ub_ctx_add_ta ( struct ub_ctx ctx,
const char *  ta 
)

Add a trust anchor to the given context.

The trust anchor is a string, on one line, that holds a valid DNSKEY or DS RR.

Parameters
ctxcontext. At this time it is only possible to add trusted keys before the first resolve is done.
tastring, with zone-format RR on one line. [domainname] [TTL optional] [type] [class optional] [rdata contents]
Returns
0 if OK, else error.

References module_env::cfg, cfg_strlist_insert(), ub_ctx::cfglock, ub_ctx::env, ub_ctx::finalized, config_file::trust_anchor_list, UB_AFTERFINAL, UB_NOERROR, and UB_NOMEM.

Referenced by main().

int ub_ctx_add_ta_file ( struct ub_ctx ctx,
const char *  fname 
)

Add trust anchors to the given context.

Pass name of a file with DS and DNSKEY records (like from dig or drill).

Parameters
ctxcontext. At this time it is only possible to add trusted keys before the first resolve is done.
fnamefilename of file with keyfile with trust anchors.
Returns
0 if OK, else error.

References module_env::cfg, cfg_strlist_insert(), ub_ctx::cfglock, ub_ctx::env, ub_ctx::finalized, config_file::trust_anchor_file_list, UB_AFTERFINAL, UB_NOERROR, and UB_NOMEM.

Referenced by do_update(), and main().

int ub_ctx_add_ta_autr ( struct ub_ctx ctx,
const char *  fname 
)

Add trust anchor to the give context that is tracked with RFC5011 automated trust anchor maintenance.

The file is written to when the trust anchor is changed. Pass the name of a file that was output from eg. unbound-anchor, or you can start it by providing a trusted DNSKEY or DS record on one line in the file.

Parameters
ctxcontext. At this time it is only possible to add trusted keys before the first resolve is done.
fnamefilename of file with trust anchor.
Returns
0 if OK, else error.

References config_file::auto_trust_anchor_file_list, module_env::cfg, cfg_strlist_insert(), ub_ctx::cfglock, ub_ctx::env, ub_ctx::finalized, UB_AFTERFINAL, UB_NOERROR, and UB_NOMEM.

int ub_ctx_trustedkeys ( struct ub_ctx ctx,
const char *  fname 
)

Add trust anchors to the given context.

Pass the name of a bind-style config file with trusted-keys{}.

Parameters
ctxcontext. At this time it is only possible to add trusted keys before the first resolve is done.
fnamefilename of file with bind-style config entries with trust anchors.
Returns
0 if OK, else error.

References module_env::cfg, cfg_strlist_insert(), ub_ctx::cfglock, ub_ctx::env, ub_ctx::finalized, config_file::trusted_keys_file_list, UB_AFTERFINAL, UB_NOERROR, and UB_NOMEM.

Referenced by main().

int ub_ctx_debuglevel ( struct ub_ctx ctx,
int  d 
)

Set debug verbosity for the context Output is directed to stderr.

Parameters
ctxcontext.
ddebug level, 0 is off, 1 is very minimal, 2 is detailed, and 3 is lots.
Returns
0 if OK, else error.

References module_env::cfg, ub_ctx::cfglock, ub_ctx::env, UB_NOERROR, config_file::verbosity, and verbosity.

Referenced by main().

int ub_ctx_debugout ( struct ub_ctx ctx,
void *  out 
)

Set debug output (and error output) to the specified stream.

Pass NULL to disable. Default is stderr.

Parameters
ctxcontext.
outFILE* out file stream to log to. Type void* to avoid stdio dependency of this header file.
Returns
0 if OK, else error.

References ub_ctx::cfglock, log_file(), ub_ctx::log_out, ub_ctx::logfile_override, and UB_NOERROR.

int ub_ctx_async ( struct ub_ctx ctx,
int  dothread 
)

Set a context behaviour for asynchronous action.

Parameters
ctxcontext.
dothreadif true, enables threading and a call to resolve_async() creates a thread to handle work in the background. If false, a process is forked to handle work in the background. Changes to this setting after async() calls have been made have no effect (delete and re-create the context to change).
Returns
0 if OK, else error.

References ub_ctx::cfglock, ub_ctx::dothread, ub_ctx::finalized, UB_AFTERFINAL, and UB_NOERROR.

Referenced by main().

int ub_poll ( struct ub_ctx ctx)

Poll a context to see if it has any new results Do not poll in a loop, instead extract the fd below to poll for readiness, and then check, or wait using the wait routine.

Parameters
ctxcontext.
Returns
: 0 if nothing to read, or nonzero if a result is available. If nonzero, call ctx_process() to do callbacks.

References ub_ctx::rr_pipe, and tube_poll().

int ub_fd ( struct ub_ctx ctx)

Get file descriptor.

Wait for it to become readable, at this point answers are returned from the asynchronous validating resolver. Then call the ub_process to continue processing. This routine works immediately after context creation, the fd does not change.

Parameters
ctxcontext.
Returns
: -1 on error, or file descriptor to use select(2) with.

References ub_ctx::rr_pipe, and tube_read_fd().

int ub_process ( struct ub_ctx ctx)

Call this routine to continue processing results from the validating resolver (when the fd becomes readable).

Will perform necessary callbacks.

Parameters
ctxcontext
Returns
: 0 if OK, else error.

References ub_result::len, process_answer(), ub_ctx::rr_pipe, ub_ctx::rrpipe_lock, tube_read_msg(), UB_NOERROR, and UB_PIPE.

Referenced by main().

int ub_wait ( struct ub_ctx ctx)

Wait for a context to finish with results.

Calls ub_process() after the wait for you. After the wait, there are no more outstanding asynchronous queries.

Parameters
ctxcontext.
Returns
: 0 if OK, else error.

References ub_ctx::cfglock, ub_result::len, ub_ctx::num_async, process_answer_detail(), ub_ctx::rr_pipe, ub_ctx::rrpipe_lock, tube_read_msg(), tube_wait(), UB_NOERROR, and UB_PIPE.

Referenced by ext_thread().

int ub_resolve ( struct ub_ctx ctx,
const char *  name,
int  rrtype,
int  rrclass,
struct ub_result **  result 
)

Perform resolution and validation of the target name.

Parameters
ctxcontext. The context is finalized, and can no longer accept config changes.
namedomain name in text format (a zero terminated text string).
rrtypetype of RR in host order, 1 is A (address).
rrclassclass of RR in host order, 1 is IN (for internet).
resultthe result data is returned in a newly allocated result structure. May be NULL on return, return value is set to an error in that case (out of memory).
Returns
0 if OK, else error.

References ub_result::answer_len, ub_result::answer_packet, ub_ctx::cfglock, context_finalize(), context_new(), context_query_delete(), ub_ctx::finalized, rbnode_t::key, libworker_fg(), ctx_query::msg, ctx_query::msg_len, ctx_query::node, ub_ctx::queries, rbtree_delete(), ctx_query::res, UB_NOERROR, and UB_NOMEM.

Referenced by dnslook(), do_lookup(), ext_thread(), main(), prime_root_key(), and resolve_host_ip().

int ub_resolve_event ( struct ub_ctx ctx,
const char *  name,
int  rrtype,
int  rrclass,
void *  mydata,
ub_event_callback_t  callback,
int *  async_id 
)

Perform resolution and validation of the target name.

Asynchronous, after a while, the callback will be called with your data and the result. Uses the event_base user installed by creating the context with ub_ctx_create_event().

Parameters
ctxcontext with event_base in it. The context is finalized, and can no longer accept all config changes.
namedomain name in text format (a string).
rrtypetype of RR in host order, 1 is A.
rrclassclass of RR in host order, 1 is IN (for internet).
mydatathis data is your own data (you can pass NULL), and is passed on to the callback function.
callbackthis is called on completion of the resolution. It is called as: void callback(void* mydata, int rcode, void* packet, int packet_len, int sec, char* why_bogus) with mydata: the same as passed here, you may pass NULL, with rcode: 0 on no error, nonzero for mostly SERVFAIL situations, this is a DNS rcode. with packet: a buffer with DNS wireformat packet with the answer. do not inspect if rcode != 0. do not write or free the packet buffer, it is used internally in unbound (for other callbacks that want the same data). with packet_len: length in bytes of the packet buffer. with sec: 0 if insecure, 1 if bogus, 2 if DNSSEC secure. with why_bogus: text string explaining why it is bogus (or NULL). These point to buffers inside unbound; do not deallocate the packet or error string.

If an error happens during processing, your callback will be called with error set to a nonzero value (and result==NULL). For localdata (etc/hosts) the callback is called immediately, before resolve_event returns, async_id=0 is returned.

Parameters
async_idif you pass a non-NULL value, an identifier number is returned for the query as it is in progress. It can be used to cancel the query.
Returns
0 if OK, else error.

References ub_ctx::cfglock, context_finalize(), context_new(), ub_ctx::event_base, ub_ctx::event_worker, ub_ctx::finalized, libworker_attach_mesh(), libworker_create_event(), UB_INITFAIL, UB_NOERROR, and UB_NOMEM.

int ub_resolve_async ( struct ub_ctx ctx,
const char *  name,
int  rrtype,
int  rrclass,
void *  mydata,
ub_callback_t  callback,
int *  async_id 
)

Perform resolution and validation of the target name.

Asynchronous, after a while, the callback will be called with your data and the result.

Parameters
ctxcontext. If no thread or process has been created yet to perform the work in the background, it is created now. The context is finalized, and can no longer accept config changes.
namedomain name in text format (a string).
rrtypetype of RR in host order, 1 is A.
rrclassclass of RR in host order, 1 is IN (for internet).
mydatathis data is your own data (you can pass NULL), and is passed on to the callback function.
callbackthis is called on completion of the resolution. It is called as: void callback(void* mydata, int err, struct ub_result* result) with mydata: the same as passed here, you may pass NULL, with err: is 0 when a result has been found. with result: a newly allocated result structure. The result may be NULL, in that case err is set.

If an error happens during processing, your callback will be called with error set to a nonzero value (and result==NULL).

Parameters
async_idif you pass a non-NULL value, an identifier number is returned for the query as it is in progress. It can be used to cancel the query.
Returns
0 if OK, else error.

References ub_ctx::cfglock, context_finalize(), context_new(), context_query_delete(), context_serialize_new_query(), ub_ctx::created_bg, ub_ctx::finalized, rbnode_t::key, libworker_bg(), ctx_query::msg, ctx_query::node, ub_ctx::num_async, ub_ctx::qq_pipe, ub_ctx::qqpipe_lock, ub_ctx::queries, ctx_query::querynum, rbtree_delete(), tube_write_msg(), UB_NOERROR, UB_NOMEM, and UB_PIPE.

Referenced by ext_thread(), and main().

int ub_cancel ( struct ub_ctx ctx,
int  async_id 
)

Cancel an async query in progress.

Its callback will not be called.

Parameters
ctxcontext.
async_idwhich query to cancel.
Returns
0 if OK, else error. This routine can return an error if the async_id passed does not exist or has already been delivered. If another thread is processing results at the same time, the result may be delivered at the same time and the cancel fails with an error. Also the cancel can fail due to a system error, no memory or socket failures.

References ctx_query::async, ctx_query::cancelled, ub_ctx::cfglock, context_query_delete(), context_serialize_cancel(), ub_ctx::dothread, rbnode_t::key, log_assert, ctx_query::msg, ctx_query::node, ub_ctx::num_async, ub_ctx::qq_pipe, ub_ctx::qqpipe_lock, ub_ctx::queries, rbtree_delete(), rbtree_search(), tube_write_msg(), UB_NOERROR, UB_NOID, UB_NOMEM, and UB_PIPE.

Referenced by ext_thread(), and main().

void ub_resolve_free ( struct ub_result result)
const char* ub_strerror ( int  err)

Convert error value to a human readable string.

Parameters
errerror code from one of the libunbound functions.
Returns
pointer to constant text string, zero terminated.

References UB_AFTERFINAL, UB_FORKFAIL, UB_INITFAIL, UB_NOERROR, UB_NOID, UB_NOMEM, UB_PIPE, UB_READFILE, UB_SERVFAIL, UB_SOCKET, and UB_SYNTAX.

Referenced by add_5011_probe_root(), check_ub_res(), checkerr(), create_unbound_context(), dnslook(), do_lookup(), do_update(), main(), prime_root_key(), print_result(), and resolve_host_ip().

int ub_ctx_set_fwd ( struct ub_ctx ctx,
const char *  addr 
)

Set machine to forward DNS queries to, the caching resolver to use.

IP4 or IP6 address. Forwards all DNS requests to that machine, which is expected to run a recursive resolver. If the proxy is not DNSSEC-capable, validation may fail. Can be called several times, in that case the addresses are used as backup servers.

To read the list of nameservers from /etc/resolv.conf (from DHCP or so), use the call ub_ctx_resolvconf.

Parameters
ctxcontext. At this time it is only possible to set configuration before the first resolve is done.
addraddress, IP4 or IP6 in string format. If the addr is NULL, forwarding is disabled.
Returns
0 if OK, else error.

References config_stub::addrs, module_env::cfg, cfg_strlist_insert(), ub_ctx::cfglock, config_delstubs(), ub_ctx::env, extstrtoaddr(), ub_ctx::finalized, config_file::forwards, log_assert, config_stub::name, config_stub::next, UB_AFTERFINAL, UB_NOERROR, UB_NOMEM, and UB_SYNTAX.

Referenced by main(), and ub_ctx_resolvconf().

int ub_ctx_resolvconf ( struct ub_ctx ctx,
const char *  fname 
)

Read list of nameservers to use from the filename given.

Usually "/etc/resolv.conf". Uses those nameservers as caching proxies. If they do not support DNSSEC, validation may fail.

Only nameservers are picked up, the searchdomain, ndots and other settings from resolv.conf(5) are ignored.

Parameters
ctxcontext. At this time it is only possible to set configuration before the first resolve is done.
fnamefile name string. If NULL "/etc/resolv.conf" is used.
Returns
0 if OK, else error.

References ub_ctx_set_fwd(), UB_NOERROR, and UB_READFILE.

Referenced by create_unbound_context(), and main().

int ub_ctx_hosts ( struct ub_ctx ctx,
const char *  fname 
)

Read list of hosts from the filename given.

Usually "/etc/hosts". These addresses are not flagged as DNSSEC secure when queried for.

Parameters
ctxcontext. At this time it is only possible to set configuration before the first resolve is done.
fnamefile name string. If NULL "/etc/hosts" is used.
Returns
0 if OK, else error.

References module_env::cfg, cfg_strlist_insert(), ub_ctx::cfglock, ub_ctx::env, ub_ctx::finalized, config_file::local_data, config_stub::name, str_is_ip6(), UB_AFTERFINAL, ub_ctx_hosts(), UB_NOERROR, UB_NOMEM, UB_READFILE, and UB_SYNTAX.

Referenced by main(), and ub_ctx_hosts().

int ub_ctx_print_local_zones ( struct ub_ctx ctx)

Debug routine.

Print the local zone information to debug output.

Parameters
ctxcontext. Is finalized by the routine.
Returns
0 if OK, else error.

References ub_ctx::local_zones, local_zones_print(), ub_ctx_finalize(), and UB_NOERROR.

int ub_ctx_zone_add ( struct ub_ctx ctx,
const char *  zone_name,
const char *  zone_type 
)

Add a new zone with the zonetype to the local authority info of the library.

Parameters
ctxcontext. Is finalized by the routine.
zone_namename of the zone in text, "example.com" If it already exists, the type is updated.
zone_typetype of the zone (like for unbound.conf) in text.
Returns
0 if OK, else error.

References LDNS_RR_CLASS_IN, local_zone_str2type(), ub_ctx::local_zones, local_zones_add_zone(), local_zones_find(), local_zones::lock, local_zone::lock, parse_dname(), local_zone::type, ub_ctx_finalize(), UB_NOERROR, UB_NOMEM, and UB_SYNTAX.

int ub_ctx_zone_remove ( struct ub_ctx ctx,
const char *  zone_name 
)

Remove zone from local authority info of the library.

Parameters
ctxcontext. Is finalized by the routine.
zone_namename of the zone in text, "example.com" If it does not exist, nothing happens.
Returns
0 if OK, else error.

References LDNS_RR_CLASS_IN, ub_ctx::local_zones, local_zones_del_zone(), local_zones_find(), local_zones::lock, parse_dname(), ub_ctx_finalize(), UB_NOERROR, and UB_SYNTAX.

int ub_ctx_data_add ( struct ub_ctx ctx,
const char *  data 
)

Add localdata to the library local authority info.

Similar to local-data config statement.

Parameters
ctxcontext. Is finalized by the routine.
datathe resource record in text format, for example "www.example.com IN A 127.0.0.1"
Returns
0 if OK, else error.

References ub_ctx::local_zones, local_zones_add_RR(), ub_ctx_finalize(), UB_NOERROR, and UB_NOMEM.

int ub_ctx_data_remove ( struct ub_ctx ctx,
const char *  data 
)

Remove localdata from the library local authority info.

Parameters
ctxcontext. Is finalized by the routine.
datathe name to delete all data from, like "www.example.com".
Returns
0 if OK, else error.

References LDNS_RR_CLASS_IN, ub_ctx::local_zones, local_zones_del_data(), parse_dname(), ub_ctx_finalize(), UB_NOERROR, and UB_SYNTAX.

const char* ub_version ( void  )

Get a version string from the libunbound implementation.

Returns
a static constant string with the version number.
int ub_ctx_set_event ( struct ub_ctx ctx,
struct event_base *  base 
)

Set a new event_base on a context created with ub_ctx_create_event.

Any outbound queries will be canceled.

Parameters
ctxthe ub_ctx to update. Must have been created with ub_ctx_create_event
basethe new event_base to attach to the ctx
Returns
0 if OK, else error

References ub_ctx::cfglock, ub_ctx::created_bg, ub_ctx::dothread, ub_ctx::event_base, ub_ctx::event_worker, libworker_delete_event(), UB_INITFAIL, and UB_NOERROR.