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getdns/src/general.c

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/**
*
* \file general.c
* @brief getdns_general and related support functions
*
* The getdns_general function is called by most of the other public entry
* points to the library. Private support functions are also included in this
* file where they are directly logically related to the getdns_general implementation.
*/
/*
* Copyright (c) 2013, NLnet Labs, Verisign, Inc.
* All rights reserved.
*
* 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 names of the copyright holders 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 Verisign, Inc. 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.
*/
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "general.h"
#ifdef HAVE_LIBUNBOUND
#include <unbound.h>
#endif
#ifdef HAVE_UNBOUND_EVENT_API
#include "ub_loop.h"
#endif
#include "gldns/wire2str.h"
#include "context.h"
#include "types-internal.h"
#include "util-internal.h"
#include "dnssec.h"
#include "stub.h"
#include "dict.h"
#include "mdns.h"
#include "debug.h"
#include "anchor.h"
void _getdns_call_user_callback(getdns_dns_req *dnsreq, getdns_dict *response)
{
_getdns_context_clear_outbound_request(dnsreq);
#if defined(REQ_DEBUG) && REQ_DEBUG
debug_req(__FUNC__, *dnsreq->netreqs);
#endif
if (dnsreq->user_callback) {
dnsreq->context->processing = 1;
dnsreq->user_callback(dnsreq->context,
( ! response ? GETDNS_CALLBACK_ERROR
: dnsreq->request_timed_out ? GETDNS_CALLBACK_TIMEOUT
: GETDNS_CALLBACK_COMPLETE ),
response, dnsreq->user_pointer, dnsreq->trans_id);
dnsreq->context->processing = 0;
}
_getdns_dns_req_free(dnsreq);
}
static int
no_answer(getdns_dns_req *dns_req)
{
getdns_network_req **netreq_p, *netreq;
for (netreq_p = dns_req->netreqs; (netreq = *netreq_p); netreq_p++) {
_getdns_rrset_spc answer;
if (netreq->response_len > 0 &&
GLDNS_ANCOUNT(netreq->response) > 0 &&
_getdns_rrset_answer(&answer, netreq->response
, netreq->response_len))
return 0;
}
return 1;
}
void
_getdns_check_dns_req_complete(getdns_dns_req *dns_req)
{
getdns_network_req **netreq_p, *netreq;
int results_found = 0, timed_out = 1, r;
uint64_t now_ms = 0;
for (netreq_p = dns_req->netreqs; (netreq = *netreq_p); netreq_p++)
if (!_getdns_netreq_finished(netreq))
return;
else {
if (netreq->state != NET_REQ_TIMED_OUT)
timed_out = 0;
if (netreq->response_len > 0)
results_found = 1;
}
if (timed_out) {
_getdns_context_request_timed_out(dns_req);
return;
}
/* Do we have to check more suffixes on nxdomain/nodata?
*/
if (dns_req->is_dns_request &&
dns_req->suffix_appended && /* Something was appended */
dns_req->suffix_len > 1 && /* Next suffix available */
no_answer(dns_req)) {
/* Remove suffix from name */
dns_req->name_len -= dns_req->suffix_len - 1;
dns_req->name[dns_req->name_len - 1] = 0;
do {
dns_req->suffix += dns_req->suffix_len;
dns_req->suffix_len = *dns_req->suffix++;
if (dns_req->suffix_len + dns_req->name_len - 1 <
sizeof(dns_req->name)) {
memcpy(dns_req->name + dns_req->name_len - 1,
dns_req->suffix, dns_req->suffix_len);
dns_req->name_len += dns_req->suffix_len - 1;
dns_req->suffix_appended = 1;
break;
}
} while (dns_req->suffix_len > 1 && *dns_req->suffix);
if (dns_req->append_name == GETDNS_APPEND_NAME_ALWAYS ||
dns_req->append_name ==
GETDNS_APPEND_NAME_TO_SINGLE_LABEL_FIRST ||
(dns_req->suffix_len > 1 && *dns_req->suffix)) {
for ( netreq_p = dns_req->netreqs
; (netreq = *netreq_p)
; netreq_p++ ) {
_getdns_netreq_reinit(netreq);
if ((r = _getdns_submit_netreq(netreq, &now_ms))) {
if (r == DNS_REQ_FINISHED)
return;
_getdns_netreq_change_state(netreq, NET_REQ_ERRORED);
}
}
_getdns_check_dns_req_complete(dns_req);
return;
}
} else if (
dns_req->is_dns_request &&
( dns_req->append_name ==
GETDNS_APPEND_NAME_ONLY_TO_SINGLE_LABEL_AFTER_FAILURE ||
dns_req->append_name ==
GETDNS_APPEND_NAME_ONLY_TO_MULTIPLE_LABEL_NAME_AFTER_FAILURE
) &&
!dns_req->suffix_appended &&
dns_req->suffix_len > 1 &&
no_answer(dns_req)) {
/* Initial suffix append */
for (
; dns_req->suffix_len > 1 && *dns_req->suffix
; dns_req->suffix += dns_req->suffix_len
, dns_req->suffix_len = *dns_req->suffix++) {
if (dns_req->suffix_len + dns_req->name_len - 1 <
sizeof(dns_req->name)) {
memcpy(dns_req->name + dns_req->name_len - 1,
dns_req->suffix, dns_req->suffix_len);
dns_req->name_len += dns_req->suffix_len - 1;
dns_req->suffix_appended = 1;
break;
}
}
if (dns_req->suffix_appended) {
for ( netreq_p = dns_req->netreqs
; (netreq = *netreq_p)
; netreq_p++ ) {
_getdns_netreq_reinit(netreq);
if ((r = _getdns_submit_netreq(netreq, &now_ms))) {
if (r == DNS_REQ_FINISHED)
return;
_getdns_netreq_change_state(netreq, NET_REQ_ERRORED);
}
}
_getdns_check_dns_req_complete(dns_req);
return;
}
}
#if defined(REQ_DEBUG) && REQ_DEBUG
if (dns_req->internal_cb)
debug_req("CB Internal", *dns_req->netreqs);
else if (results_found)
debug_req("CB Complete", *dns_req->netreqs);
else
debug_req("CB Error ", *dns_req->netreqs);
#endif
if (dns_req->internal_cb) {
_getdns_context_clear_outbound_request(dns_req);
dns_req->internal_cb(dns_req);
} else if (! results_found)
_getdns_call_user_callback(dns_req, NULL);
else if (
dns_req->is_dns_request &&
(dns_req->dnssec_return_validation_chain
#ifdef DNSSEC_ROADBLOCK_AVOIDANCE
|| ( dns_req->dnssec_roadblock_avoidance
&& !dns_req->avoid_dnssec_roadblocks)
#endif
#ifdef STUB_NATIVE_DNSSEC
|| ( dns_req->context->resolution_type == GETDNS_RESOLUTION_STUB
&& !dns_req->avoid_dnssec_roadblocks
&& (dns_req->dnssec_return_status ||
dns_req->dnssec_return_only_secure ||
dns_req->dnssec_return_all_statuses
))
#endif
|| ( dns_req->context->resolution_type == GETDNS_RESOLUTION_RECURSING
&& _getdns_bogus(dns_req))
)) {
/* Reschedule timeout for this DNS request
*/
if (dns_req->timeout.timeout_cb && dns_req->timeout.ev)
GETDNS_CLEAR_EVENT(dns_req->loop, &dns_req->timeout);
GETDNS_SCHEDULE_EVENT(dns_req->loop, -1,
_getdns_ms_until_expiry2(dns_req->expires, &now_ms),
getdns_eventloop_event_init(&dns_req->timeout, dns_req,
NULL, NULL, (getdns_eventloop_callback)
_getdns_validation_chain_timeout));
#if defined(REQ_DEBUG) && REQ_DEBUG
debug_req("getting validation chain for ", *dns_req->netreqs);
#endif
DEBUG_ANCHOR("Valchain lookup\n");
_getdns_get_validation_chain(dns_req);
} else
_getdns_call_user_callback(
dns_req, _getdns_create_getdns_response(dns_req));
}
#ifdef HAVE_LIBUNBOUND
#ifdef HAVE_UNBOUND_EVENT_API
static void
ub_resolve_event_callback(void* arg, int rcode, void *pkt, int pkt_len,
int sec, char* why_bogus)
{
getdns_network_req *netreq = (getdns_network_req *) arg;
getdns_dns_req *dns_req = netreq->owner;
_getdns_netreq_change_state(netreq, NET_REQ_FINISHED);
/* parse */
if (getdns_apply_network_result(
netreq, rcode, pkt, pkt_len, sec, why_bogus)) {
_getdns_call_user_callback(dns_req, NULL);
return;
}
_getdns_check_dns_req_complete(dns_req);
} /* ub_resolve_event_callback */
#endif
static void
ub_resolve_callback(void* arg, int err, struct ub_result* ub_res)
{
getdns_network_req *netreq = (getdns_network_req *) arg;
getdns_dns_req *dns_req = netreq->owner;
_getdns_netreq_change_state(netreq, NET_REQ_FINISHED);
if (err != 0) {
_getdns_call_user_callback(dns_req, NULL);
return;
}
/* parse */
if (getdns_apply_network_result(netreq, ub_res->rcode,
ub_res->answer_packet, ub_res->answer_len,
(ub_res->secure ? 2 : ub_res->bogus ? 1 : 0), ub_res->why_bogus)) {
ub_resolve_free(ub_res);
_getdns_call_user_callback(dns_req, NULL);
return;
}
ub_resolve_free(ub_res);
_getdns_check_dns_req_complete(dns_req);
} /* ub_resolve_callback */
#endif
void _getdns_check_expired_pending_netreqs(
getdns_context *context, uint64_t *now_ms)
{
getdns_network_req *first;
assert(context);
while (context->pending_netreqs.count) {
first = (getdns_network_req *)
_getdns_rbtree_first(&context->pending_netreqs);
if (_getdns_ms_until_expiry2(first->owner->expires, now_ms) > 0)
break;
(void) _getdns_rbtree_delete(&context->pending_netreqs, first);
_getdns_netreq_change_state(first, NET_REQ_TIMED_OUT);
_getdns_check_dns_req_complete(first->owner);
}
first = context->pending_netreqs.count ? (getdns_network_req *)
_getdns_rbtree_first(&context->pending_netreqs) : NULL;
if (first == context->first_pending_netreq ||
(first && context->first_pending_netreq &&
first->owner->expires == context->first_pending_netreq->owner->expires))
return; /* Nothing changed */
if (context->first_pending_netreq)
GETDNS_CLEAR_EVENT( context->extension
, &context->pending_timeout_event);
if ((context->first_pending_netreq = first))
GETDNS_SCHEDULE_EVENT( context->extension, -1,
_getdns_ms_until_expiry2(first->owner->expires, now_ms),
&context->pending_timeout_event);
}
void
_getdns_netreq_change_state(
getdns_network_req *netreq, network_req_state new_state)
{
getdns_context *context;
uint64_t now_ms;
getdns_network_req *prev;
if (!netreq)
return;
if (!netreq->owner->is_dns_request) {
netreq->state = new_state;
return;
}
context = netreq->owner->context;
if (netreq->state != NET_REQ_IN_FLIGHT) {
if (new_state == NET_REQ_IN_FLIGHT)
context->netreqs_in_flight += 1;
netreq->state = new_state;
return;
}
if (new_state == NET_REQ_IN_FLIGHT) /* No change */
return;
netreq->state = new_state;
context->netreqs_in_flight -= 1;
now_ms = 0;
prev = NULL;
while (context->pending_netreqs.count > 0 &&
( context->limit_outstanding_queries > context->netreqs_in_flight
|| context->limit_outstanding_queries == 0 )) {
getdns_network_req *first = (getdns_network_req *)
_getdns_rbtree_first(&context->pending_netreqs);
/* To prevent loops due to _getdns_submit_netreq re-inserting
* because of errno == EMFILE
*/
if (first == prev)
break;
else
prev = first;
(void) _getdns_rbtree_delete(&context->pending_netreqs, first);
(void) _getdns_submit_netreq(first, &now_ms);
}
}
int
_getdns_submit_netreq(getdns_network_req *netreq, uint64_t *now_ms)
{
getdns_return_t r;
getdns_dns_req *dns_req = netreq->owner;
getdns_context *context = dns_req->context;
char name[1024];
int dnsreq_freed = 0;
#ifdef HAVE_LIBUNBOUND
int ub_resolve_r;
#endif
if (context->limit_outstanding_queries > 0 &&
context->netreqs_in_flight >= context->limit_outstanding_queries) {
netreq->node.key = netreq;
if (_getdns_rbtree_insert(
&context->pending_netreqs, &netreq->node)) {
_getdns_check_expired_pending_netreqs(context, now_ms);
return GETDNS_RETURN_GOOD;
}
}
_getdns_netreq_change_state(netreq, NET_REQ_IN_FLIGHT);
debug_req("Submitting ", netreq);
#ifdef STUB_NATIVE_DNSSEC
# ifdef DNSSEC_ROADBLOCK_AVOIDANCE
if ((context->resolution_type == GETDNS_RESOLUTION_RECURSING
&& !dns_req->dnssec_roadblock_avoidance)
|| dns_req->avoid_dnssec_roadblocks) {
# else
if ( context->resolution_type == GETDNS_RESOLUTION_RECURSING) {
# endif
#else
if ( context->resolution_type == GETDNS_RESOLUTION_RECURSING
|| dns_req->dnssec_return_status
|| dns_req->dnssec_return_only_secure
|| dns_req->dnssec_return_all_statuses
|| dns_req->dnssec_return_validation_chain) {
#endif
/* schedule the timeout */
if (! dns_req->timeout.timeout_cb) {
dns_req->timeout.userarg = dns_req;
dns_req->timeout.read_cb = NULL;
dns_req->timeout.write_cb = NULL;
dns_req->timeout.timeout_cb =
(getdns_eventloop_callback)
_getdns_context_request_timed_out;
dns_req->timeout.ev = NULL;
if ((r = dns_req->loop->vmt->schedule(dns_req->loop, -1,
_getdns_ms_until_expiry2(dns_req->expires, now_ms),
&dns_req->timeout)))
return r;
}
(void) gldns_wire2str_dname_buf(dns_req->name,
dns_req->name_len, name, sizeof(name));
#ifdef HAVE_LIBUNBOUND
dns_req->freed = &dnsreq_freed;
#ifdef HAVE_UNBOUND_EVENT_API
if (_getdns_ub_loop_enabled(&context->ub_loop))
ub_resolve_r = ub_resolve_event(context->unbound_ctx,
name, netreq->request_type, dns_req->request_class,
netreq, ub_resolve_event_callback, &(netreq->unbound_id)) ?
GETDNS_RETURN_GENERIC_ERROR : GETDNS_RETURN_GOOD;
else
#endif
ub_resolve_r = ub_resolve_async(context->unbound_ctx,
name, netreq->request_type, dns_req->request_class,
netreq, ub_resolve_callback, &(netreq->unbound_id)) ?
GETDNS_RETURN_GENERIC_ERROR : GETDNS_RETURN_GOOD;
if (dnsreq_freed)
return DNS_REQ_FINISHED;
dns_req->freed = NULL;
return ub_resolve_r ? GETDNS_RETURN_GENERIC_ERROR : GETDNS_RETURN_GOOD;
#else
return GETDNS_RETURN_NOT_IMPLEMENTED;
#endif
}
/* Submit with stub resolver */
dns_req->freed = &dnsreq_freed;
r = _getdns_submit_stub_request(netreq, now_ms);
if (dnsreq_freed)
return DNS_REQ_FINISHED;
dns_req->freed = NULL;
return r;
}
/**
* structure used by validate_extensions() to check extension formats
*/
typedef struct getdns_extension_format
{
char *extstring;
getdns_data_type exttype;
int implemented;
} getdns_extension_format;
static int
extformatcmp(const void *a, const void *b)
{
return strcmp(((getdns_extension_format *) a)->extstring,
((getdns_extension_format *) b)->extstring);
}
/*---------------------------------------- validate_extensions */
static getdns_return_t
validate_extensions(struct getdns_dict * extensions)
{
/**
* this is a comprehensive list of extensions and their data types
* used by validate_extensions()
* The list has to be in sorted order for bsearch lookup in function
* validate_extensions.
*/
static getdns_extension_format extformats[] = {
{"add_opt_parameters" , t_dict, 1},
{"add_warning_for_bad_dns" , t_int , 1},
{"dnssec_return_all_statuses" , t_int , 1},
{"dnssec_return_full_validation_chain", t_int , 1},
{"dnssec_return_only_secure" , t_int , 1},
{"dnssec_return_status" , t_int , 1},
{"dnssec_return_validation_chain", t_int , 1},
{"dnssec_roadblock_avoidance" , t_int ,
#if defined(DNSSEC_ROADBLOCK_AVOIDANCE) && defined(HAVE_LIBUNBOUND)
1},
#else
0},
#endif
{"edns_cookies" , t_int ,
#ifdef EDNS_COOKIES
1},
#else
0},
#endif
{"header" , t_dict, 1},
{"return_api_information" , t_int , 1},
{"return_both_v4_and_v6" , t_int , 1},
{"return_call_reporting" , t_int , 1},
{"specify_class" , t_int , 1},
};
struct getdns_dict_item *item;
getdns_extension_format *extformat;
if (extensions)
RBTREE_FOR(item, struct getdns_dict_item *,
&(extensions->root)) {
getdns_extension_format key;
key.extstring = (char *) item->node.key;
extformat = bsearch(&key, extformats,
sizeof(extformats) /
sizeof(getdns_extension_format),
sizeof(getdns_extension_format), extformatcmp);
if (!extformat)
return GETDNS_RETURN_NO_SUCH_EXTENSION;
if (!extformat->implemented)
return GETDNS_RETURN_NOT_IMPLEMENTED;
if (item->i.dtype != extformat->exttype)
return GETDNS_RETURN_EXTENSION_MISFORMAT;
}
return GETDNS_RETURN_GOOD;
} /* _getdns_validate_extensions */
static getdns_return_t
getdns_general_ns(getdns_context *context, getdns_eventloop *loop,
const char *name, uint16_t request_type, getdns_dict *extensions,
void *userarg, getdns_network_req **return_netreq_p,
getdns_callback_t callbackfn, internal_cb_t internal_cb, int usenamespaces)
{
int r = GETDNS_RETURN_GOOD;
getdns_network_req *netreq, **netreq_p;
getdns_dns_req *req;
getdns_dict *localnames_response;
size_t i;
uint64_t now_ms = 0;
if (!context || !name || (!callbackfn && !internal_cb))
return GETDNS_RETURN_INVALID_PARAMETER;
if ((r = _getdns_validate_dname(name)))
return r;
if (extensions && (r = validate_extensions(extensions)))
return r;
/* create the request */
if (!(req = _getdns_dns_req_new(
context, loop, name, request_type, extensions, &now_ms)))
return GETDNS_RETURN_MEMORY_ERROR;
req->user_pointer = userarg;
req->user_callback = callbackfn;
req->internal_cb = internal_cb;
req->is_sync_request = loop == &context->sync_eventloop.loop;
if (return_netreq_p)
*return_netreq_p = req->netreqs[0];
_getdns_context_track_outbound_request(req);
if (req->dnssec_extension_set) {
if (context->trust_anchors_source == GETDNS_TASRC_XML_UPDATE)
_getdns_start_fetching_ta(context, loop);
else if (context->trust_anchors_source == GETDNS_TASRC_NONE) {
_getdns_context_equip_with_anchor(context, &now_ms);
if (context->trust_anchors_source == GETDNS_TASRC_NONE) {
_getdns_start_fetching_ta(context, loop);
}
}
}
if (!usenamespaces) {
if (context->trust_anchors_source == GETDNS_TASRC_FETCHING
&& context->resolution_type == GETDNS_RESOLUTION_RECURSING
&& context->resolution_type != context->resolution_type_set) {
req->waiting_for_ta = 1;
req->ta_notify = context->ta_notify;
context->ta_notify = req;
return GETDNS_RETURN_GOOD;
}
if ((r = _getdns_context_prepare_for_resolution(context)))
; /* pass */
/* issue all network requests */
else for ( netreq_p = req->netreqs
; !r && (netreq = *netreq_p)
; netreq_p++) {
if ((r = _getdns_submit_netreq(netreq, &now_ms))) {
if (r == DNS_REQ_FINISHED) {
if (return_netreq_p)
*return_netreq_p = NULL;
return GETDNS_RETURN_GOOD;
}
_getdns_netreq_change_state(netreq, NET_REQ_ERRORED);
}
}
} else for (i = 0; i < context->namespace_count; i++) {
if (context->namespaces[i] == GETDNS_NAMESPACE_LOCALNAMES) {
if (!(r = _getdns_context_local_namespace_resolve(
req, &localnames_response))) {
req->is_dns_request = 0;
_getdns_call_user_callback
( req, localnames_response);
break;
}
#ifdef HAVE_MDNS_SUPPORT
} else if (context->namespaces[i] == GETDNS_NAMESPACE_MDNS) {
/* Check whether the name belongs in the MDNS space */
if (!(r = _getdns_mdns_namespace_check(req)))
{
req->is_dns_request = 0;
// Submit the query to the MDNS transport.
for (netreq_p = req->netreqs
; !r && (netreq = *netreq_p)
; netreq_p++) {
if ((r = _getdns_submit_mdns_request(netreq))) {
if (r == DNS_REQ_FINISHED) {
if (return_netreq_p)
*return_netreq_p = NULL;
return GETDNS_RETURN_GOOD;
}
_getdns_netreq_change_state(netreq, NET_REQ_ERRORED);
}
}
/* Stop processing more namespaces, since there was a match */
break;
}
#endif /* HAVE_MDNS_SUPPORT */
} else if (context->namespaces[i] == GETDNS_NAMESPACE_DNS) {
if (context->trust_anchors_source == GETDNS_TASRC_FETCHING
&& context->resolution_type == GETDNS_RESOLUTION_RECURSING
&& context->resolution_type != context->resolution_type_set) {
req->waiting_for_ta = 1;
req->ta_notify = context->ta_notify;
context->ta_notify = req;
return GETDNS_RETURN_GOOD;
}
if ((r = _getdns_context_prepare_for_resolution(context)))
break;
/* TODO: We will get a good return code here even if
the name is not found (NXDOMAIN). We should consider
if this means we go onto the next namespace instead
of returning */
r = GETDNS_RETURN_GOOD;
for ( netreq_p = req->netreqs
; !r && (netreq = *netreq_p)
; netreq_p++) {
if ((r = _getdns_submit_netreq(netreq, &now_ms))) {
if (r == DNS_REQ_FINISHED) {
if (return_netreq_p)
*return_netreq_p = NULL;
return GETDNS_RETURN_GOOD;
}
_getdns_netreq_change_state(netreq, NET_REQ_ERRORED);
}
}
break;
} else
r = GETDNS_RETURN_BAD_CONTEXT;
}
if (r > 0) { /* i.e. r != GETDNS_RETURN_GOOD && r != DNS_REQ_FINISHED */
/* clean up the request */
_getdns_context_clear_outbound_request(req);
_getdns_dns_req_free(req);
return r;
}
return GETDNS_RETURN_GOOD;
} /* getdns_general_ns */
getdns_return_t
_getdns_general_loop(getdns_context *context, getdns_eventloop *loop,
const char *name, uint16_t request_type, getdns_dict *extensions,
void *userarg, getdns_network_req **netreq_p,
getdns_callback_t callback, internal_cb_t internal_cb)
{
return getdns_general_ns(context, loop,
name, request_type, extensions,
userarg, netreq_p, callback, internal_cb, 0);
} /* getdns_general_loop */
getdns_return_t
_getdns_address_loop(getdns_context *context, getdns_eventloop *loop,
const char *name, getdns_dict *extensions, void *userarg,
getdns_transaction_t *transaction_id, getdns_callback_t callback)
{
getdns_dict *my_extensions = extensions;
getdns_return_t r;
uint32_t value;
getdns_network_req *netreq = NULL;
if (!my_extensions) {
if (!(my_extensions=getdns_dict_create_with_context(context)))
return GETDNS_RETURN_MEMORY_ERROR;
} else if (
getdns_dict_get_int(my_extensions, "return_both_v4_and_v6", &value)
&& (r = _getdns_dict_copy(extensions, &my_extensions)))
return r;
if (my_extensions != extensions && (r = getdns_dict_set_int(
my_extensions, "return_both_v4_and_v6", GETDNS_EXTENSION_TRUE)))
return r;
r = getdns_general_ns(context, loop,
name, GETDNS_RRTYPE_AAAA, my_extensions,
userarg, &netreq, callback, NULL, 1);
if (netreq && transaction_id)
*transaction_id = netreq->owner->trans_id;
if (my_extensions != extensions)
getdns_dict_destroy(my_extensions);
return r;
} /* getdns_address_loop */
getdns_return_t
_getdns_hostname_loop(getdns_context *context, getdns_eventloop *loop,
getdns_dict *address, getdns_dict *extensions, void *userarg,
getdns_transaction_t *transaction_id, getdns_callback_t callback)
{
struct getdns_bindata *address_data;
struct getdns_bindata *address_type;
uint16_t req_type;
char name[1024];
getdns_return_t retval;
getdns_network_req *netreq= NULL;
if ((retval =
getdns_dict_get_bindata(address, "address_data",
&address_data)) != GETDNS_RETURN_GOOD)
return retval;
if ((retval =
getdns_dict_get_bindata(address, "address_type",
&address_type)) != GETDNS_RETURN_GOOD)
return retval;
if ((strncmp(GETDNS_STR_IPV4, (char *) address_type->data,
( strlen(GETDNS_STR_IPV4) < address_type->size
? strlen(GETDNS_STR_IPV4) : address_type->size )) == 0
&& address_data->size == 4)
|| (strncmp(GETDNS_STR_IPV6, (char *) address_type->data,
( strlen(GETDNS_STR_IPV6) < address_type->size
? strlen(GETDNS_STR_IPV6) : address_type->size )) == 0
&& address_data->size == 16))
req_type = GETDNS_RRTYPE_PTR;
else
return GETDNS_RETURN_INVALID_PARAMETER;
switch (address_data->size) {
case 4:
(void)snprintf(name, sizeof(name),
"%d.%d.%d.%d.in-addr.arpa.",
(int)((uint8_t *)address_data->data)[3],
(int)((uint8_t *)address_data->data)[2],
(int)((uint8_t *)address_data->data)[1],
(int)((uint8_t *)address_data->data)[0]);
break;
case 16:
(void)snprintf(name, sizeof(name),
"%x.%x.%x.%x.%x.%x.%x.%x."
"%x.%x.%x.%x.%x.%x.%x.%x."
"%x.%x.%x.%x.%x.%x.%x.%x."
"%x.%x.%x.%x.%x.%x.%x.%x.ip6.arpa.",
(int)(((uint8_t *)address_data->data)[15] & 0x0F),
(int)(((uint8_t *)address_data->data)[15] >> 4),
(int)(((uint8_t *)address_data->data)[14] & 0x0F),
(int)(((uint8_t *)address_data->data)[14] >> 4),
(int)(((uint8_t *)address_data->data)[13] & 0x0F),
(int)(((uint8_t *)address_data->data)[13] >> 4),
(int)(((uint8_t *)address_data->data)[12] & 0x0F),
(int)(((uint8_t *)address_data->data)[12] >> 4),
(int)(((uint8_t *)address_data->data)[11] & 0x0F),
(int)(((uint8_t *)address_data->data)[11] >> 4),
(int)(((uint8_t *)address_data->data)[10] & 0x0F),
(int)(((uint8_t *)address_data->data)[10] >> 4),
(int)(((uint8_t *)address_data->data)[9] & 0x0F),
(int)(((uint8_t *)address_data->data)[9] >> 4),
(int)(((uint8_t *)address_data->data)[8] & 0x0F),
(int)(((uint8_t *)address_data->data)[8] >> 4),
(int)(((uint8_t *)address_data->data)[7] & 0x0F),
(int)(((uint8_t *)address_data->data)[7] >> 4),
(int)(((uint8_t *)address_data->data)[6] & 0x0F),
(int)(((uint8_t *)address_data->data)[6] >> 4),
(int)(((uint8_t *)address_data->data)[5] & 0x0F),
(int)(((uint8_t *)address_data->data)[5] >> 4),
(int)(((uint8_t *)address_data->data)[4] & 0x0F),
(int)(((uint8_t *)address_data->data)[4] >> 4),
(int)(((uint8_t *)address_data->data)[3] & 0x0F),
(int)(((uint8_t *)address_data->data)[3] >> 4),
(int)(((uint8_t *)address_data->data)[2] & 0x0F),
(int)(((uint8_t *)address_data->data)[2] >> 4),
(int)(((uint8_t *)address_data->data)[1] & 0x0F),
(int)(((uint8_t *)address_data->data)[1] >> 4),
(int)(((uint8_t *)address_data->data)[0] & 0x0F),
(int)(((uint8_t *)address_data->data)[0] >> 4));
break;
default:
return GETDNS_RETURN_INVALID_PARAMETER;
}
retval = _getdns_general_loop(context, loop, name, req_type,
extensions, userarg, &netreq, callback, NULL);
if (netreq && transaction_id)
*transaction_id = netreq->owner->trans_id;
return retval;
} /* getdns_hostname_loop */
getdns_return_t
_getdns_service_loop(getdns_context *context, getdns_eventloop *loop,
const char *name, getdns_dict *extensions, void *userarg,
getdns_transaction_t * transaction_id, getdns_callback_t callback)
{
getdns_return_t r;
getdns_network_req *netreq = NULL;
r = getdns_general_ns(context, loop, name, GETDNS_RRTYPE_SRV,
extensions, userarg, &netreq, callback, NULL, 1);
if (netreq && transaction_id)
*transaction_id = netreq->owner->trans_id;
return r;
} /* getdns_service_loop */
/**
* getdns_general
*/
getdns_return_t
getdns_general(getdns_context *context,
const char *name, uint16_t request_type, getdns_dict *extensions,
void *userarg, getdns_transaction_t * transaction_id,
getdns_callback_t callbackfn)
{
getdns_return_t r;
getdns_network_req *netreq = NULL;
if (!context) return GETDNS_RETURN_INVALID_PARAMETER;
r = _getdns_general_loop(context, context->extension,
name, request_type, extensions,
userarg, &netreq, callbackfn, NULL);
if (netreq && transaction_id)
*transaction_id = netreq->owner->trans_id;
return r;
} /* getdns_general */
/*
* getdns_address
*
*/
getdns_return_t
getdns_address(getdns_context *context,
const char *name, getdns_dict *extensions, void *userarg,
getdns_transaction_t *transaction_id, getdns_callback_t callbackfn)
{
if (!context) return GETDNS_RETURN_INVALID_PARAMETER;
return _getdns_address_loop(context, context->extension,
name, extensions, userarg,
transaction_id, callbackfn);
} /* getdns_address */
/*
* getdns_hostname
*
*/
getdns_return_t
getdns_hostname(getdns_context *context,
getdns_dict *address, getdns_dict *extensions, void *userarg,
getdns_transaction_t *transaction_id, getdns_callback_t callbackfn)
{
if (!context) return GETDNS_RETURN_INVALID_PARAMETER;
return _getdns_hostname_loop(context, context->extension,
address, extensions, userarg, transaction_id, callbackfn);
} /* getdns_hostname */
/*
* getdns_service
*
*/
getdns_return_t
getdns_service(getdns_context *context,
const char *name, getdns_dict *extensions, void *userarg,
getdns_transaction_t *transaction_id, getdns_callback_t callbackfn)
{
if (!context) return GETDNS_RETURN_INVALID_PARAMETER;
return _getdns_service_loop(context, context->extension,
name, extensions, userarg, transaction_id, callbackfn);
} /* getdns_service */
/* getdns_general.c */
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