monero/external/unbound/libunbound/libworker.c

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2014-10-05 21:44:31 +00:00
/*
* libunbound/worker.c - worker thread or process that resolves
*
* 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 the worker process or thread that performs
* the DNS resolving and validation. The worker is called by a procedure
* and if in the background continues until exit, if in the foreground
* returns from the procedure when done.
*/
#include "config.h"
#ifdef HAVE_SSL
#include <openssl/ssl.h>
#endif
#include "libunbound/libworker.h"
#include "libunbound/context.h"
#include "libunbound/unbound.h"
#include "libunbound/worker.h"
#include "libunbound/unbound-event.h"
#include "services/outside_network.h"
#include "services/mesh.h"
#include "services/localzone.h"
#include "services/cache/rrset.h"
#include "services/outbound_list.h"
#include "util/fptr_wlist.h"
#include "util/module.h"
#include "util/regional.h"
#include "util/random.h"
#include "util/config_file.h"
#include "util/netevent.h"
#include "util/storage/lookup3.h"
#include "util/storage/slabhash.h"
#include "util/net_help.h"
#include "util/data/dname.h"
#include "util/data/msgreply.h"
#include "util/data/msgencode.h"
#include "util/tube.h"
#include "iterator/iter_fwd.h"
#include "iterator/iter_hints.h"
#include "ldns/sbuffer.h"
#include "ldns/str2wire.h"
/** handle new query command for bg worker */
static void handle_newq(struct libworker* w, uint8_t* buf, uint32_t len);
/** delete libworker env */
static void
libworker_delete_env(struct libworker* w)
{
if(w->env) {
outside_network_quit_prepare(w->back);
mesh_delete(w->env->mesh);
context_release_alloc(w->ctx, w->env->alloc,
!w->is_bg || w->is_bg_thread);
sldns_buffer_free(w->env->scratch_buffer);
regional_destroy(w->env->scratch);
forwards_delete(w->env->fwds);
hints_delete(w->env->hints);
ub_randfree(w->env->rnd);
free(w->env);
}
#ifdef HAVE_SSL
SSL_CTX_free(w->sslctx);
#endif
outside_network_delete(w->back);
}
/** delete libworker struct */
static void
libworker_delete(struct libworker* w)
{
if(!w) return;
libworker_delete_env(w);
comm_base_delete(w->base);
free(w);
}
void
libworker_delete_event(struct libworker* w)
{
if(!w) return;
libworker_delete_env(w);
comm_base_delete_no_base(w->base);
free(w);
}
/** setup fresh libworker struct */
static struct libworker*
libworker_setup(struct ub_ctx* ctx, int is_bg, struct event_base* eb)
{
unsigned int seed;
struct libworker* w = (struct libworker*)calloc(1, sizeof(*w));
struct config_file* cfg = ctx->env->cfg;
int* ports;
int numports;
if(!w) return NULL;
w->is_bg = is_bg;
w->ctx = ctx;
w->env = (struct module_env*)malloc(sizeof(*w->env));
if(!w->env) {
free(w);
return NULL;
}
*w->env = *ctx->env;
w->env->alloc = context_obtain_alloc(ctx, !w->is_bg || w->is_bg_thread);
if(!w->env->alloc) {
libworker_delete(w);
return NULL;
}
w->thread_num = w->env->alloc->thread_num;
alloc_set_id_cleanup(w->env->alloc, &libworker_alloc_cleanup, w);
if(!w->is_bg || w->is_bg_thread) {
lock_basic_lock(&ctx->cfglock);
}
w->env->scratch = regional_create_custom(cfg->msg_buffer_size);
w->env->scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size);
w->env->fwds = forwards_create();
if(w->env->fwds && !forwards_apply_cfg(w->env->fwds, cfg)) {
forwards_delete(w->env->fwds);
w->env->fwds = NULL;
}
w->env->hints = hints_create();
if(w->env->hints && !hints_apply_cfg(w->env->hints, cfg)) {
hints_delete(w->env->hints);
w->env->hints = NULL;
}
if(cfg->ssl_upstream) {
w->sslctx = connect_sslctx_create(NULL, NULL, NULL);
if(!w->sslctx) {
/* to make the setup fail after unlock */
hints_delete(w->env->hints);
w->env->hints = NULL;
}
}
if(!w->is_bg || w->is_bg_thread) {
lock_basic_unlock(&ctx->cfglock);
}
if(!w->env->scratch || !w->env->scratch_buffer || !w->env->fwds ||
!w->env->hints) {
libworker_delete(w);
return NULL;
}
w->env->worker = (struct worker*)w;
w->env->probe_timer = NULL;
seed = (unsigned int)time(NULL) ^ (unsigned int)getpid() ^
(((unsigned int)w->thread_num)<<17);
seed ^= (unsigned int)w->env->alloc->next_id;
if(!w->is_bg || w->is_bg_thread) {
lock_basic_lock(&ctx->cfglock);
}
if(!(w->env->rnd = ub_initstate(seed, ctx->seed_rnd))) {
if(!w->is_bg || w->is_bg_thread) {
lock_basic_unlock(&ctx->cfglock);
}
seed = 0;
libworker_delete(w);
return NULL;
}
if(!w->is_bg || w->is_bg_thread) {
lock_basic_unlock(&ctx->cfglock);
}
if(1) {
/* primitive lockout for threading: if it overwrites another
* thread it is like wiping the cache (which is likely empty
* at the start) */
/* note we are holding the ctx lock in normal threaded
* cases so that is solved properly, it is only for many ctx
* in different threads that this may clash */
static int done_raninit = 0;
if(!done_raninit) {
done_raninit = 1;
hash_set_raninit((uint32_t)ub_random(w->env->rnd));
}
}
seed = 0;
if(eb)
w->base = comm_base_create_event(eb);
else w->base = comm_base_create(0);
if(!w->base) {
libworker_delete(w);
return NULL;
}
if(!w->is_bg || w->is_bg_thread) {
lock_basic_lock(&ctx->cfglock);
}
numports = cfg_condense_ports(cfg, &ports);
if(numports == 0) {
int locked = !w->is_bg || w->is_bg_thread;
libworker_delete(w);
if(locked) {
lock_basic_unlock(&ctx->cfglock);
}
return NULL;
}
w->back = outside_network_create(w->base, cfg->msg_buffer_size,
(size_t)cfg->outgoing_num_ports, cfg->out_ifs,
cfg->num_out_ifs, cfg->do_ip4, cfg->do_ip6,
cfg->do_tcp?cfg->outgoing_num_tcp:0,
w->env->infra_cache, w->env->rnd, cfg->use_caps_bits_for_id,
ports, numports, cfg->unwanted_threshold,
&libworker_alloc_cleanup, w, cfg->do_udp, w->sslctx,
cfg->delay_close, NULL);
if(!w->is_bg || w->is_bg_thread) {
lock_basic_unlock(&ctx->cfglock);
}
free(ports);
if(!w->back) {
libworker_delete(w);
return NULL;
}
w->env->mesh = mesh_create(&ctx->mods, w->env);
if(!w->env->mesh) {
libworker_delete(w);
return NULL;
}
w->env->send_query = &libworker_send_query;
w->env->detach_subs = &mesh_detach_subs;
w->env->attach_sub = &mesh_attach_sub;
w->env->kill_sub = &mesh_state_delete;
w->env->detect_cycle = &mesh_detect_cycle;
comm_base_timept(w->base, &w->env->now, &w->env->now_tv);
return w;
}
struct libworker* libworker_create_event(struct ub_ctx* ctx,
struct event_base* eb)
{
return libworker_setup(ctx, 0, eb);
}
/** handle cancel command for bg worker */
static void
handle_cancel(struct libworker* w, uint8_t* buf, uint32_t len)
{
struct ctx_query* q;
if(w->is_bg_thread) {
lock_basic_lock(&w->ctx->cfglock);
q = context_deserialize_cancel(w->ctx, buf, len);
lock_basic_unlock(&w->ctx->cfglock);
} else {
q = context_deserialize_cancel(w->ctx, buf, len);
}
if(!q) {
/* probably simply lookup failed, i.e. the message had been
* processed and answered before the cancel arrived */
return;
}
q->cancelled = 1;
free(buf);
}
/** do control command coming into bg server */
static void
libworker_do_cmd(struct libworker* w, uint8_t* msg, uint32_t len)
{
switch(context_serial_getcmd(msg, len)) {
default:
case UB_LIBCMD_ANSWER:
log_err("unknown command for bg worker %d",
(int)context_serial_getcmd(msg, len));
/* and fall through to quit */
case UB_LIBCMD_QUIT:
free(msg);
comm_base_exit(w->base);
break;
case UB_LIBCMD_NEWQUERY:
handle_newq(w, msg, len);
break;
case UB_LIBCMD_CANCEL:
handle_cancel(w, msg, len);
break;
}
}
/** handle control command coming into server */
void
libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
uint8_t* msg, size_t len, int err, void* arg)
{
struct libworker* w = (struct libworker*)arg;
if(err != 0) {
free(msg);
/* it is of no use to go on, exit */
comm_base_exit(w->base);
return;
}
libworker_do_cmd(w, msg, len); /* also frees the buf */
}
/** the background thread func */
static void*
libworker_dobg(void* arg)
{
/* setup */
uint32_t m;
struct libworker* w = (struct libworker*)arg;
struct ub_ctx* ctx;
if(!w) {
log_err("libunbound bg worker init failed, nomem");
return NULL;
}
ctx = w->ctx;
log_thread_set(&w->thread_num);
#ifdef THREADS_DISABLED
/* we are forked */
w->is_bg_thread = 0;
/* close non-used parts of the pipes */
tube_close_write(ctx->qq_pipe);
tube_close_read(ctx->rr_pipe);
#endif
if(!tube_setup_bg_listen(ctx->qq_pipe, w->base,
libworker_handle_control_cmd, w)) {
log_err("libunbound bg worker init failed, no bglisten");
return NULL;
}
if(!tube_setup_bg_write(ctx->rr_pipe, w->base)) {
log_err("libunbound bg worker init failed, no bgwrite");
return NULL;
}
/* do the work */
comm_base_dispatch(w->base);
/* cleanup */
m = UB_LIBCMD_QUIT;
tube_remove_bg_listen(w->ctx->qq_pipe);
tube_remove_bg_write(w->ctx->rr_pipe);
libworker_delete(w);
(void)tube_write_msg(ctx->rr_pipe, (uint8_t*)&m,
(uint32_t)sizeof(m), 0);
#ifdef THREADS_DISABLED
/* close pipes from forked process before exit */
tube_close_read(ctx->qq_pipe);
tube_close_write(ctx->rr_pipe);
#endif
return NULL;
}
int libworker_bg(struct ub_ctx* ctx)
{
struct libworker* w;
/* fork or threadcreate */
lock_basic_lock(&ctx->cfglock);
if(ctx->dothread) {
lock_basic_unlock(&ctx->cfglock);
w = libworker_setup(ctx, 1, NULL);
if(!w) return UB_NOMEM;
w->is_bg_thread = 1;
#ifdef ENABLE_LOCK_CHECKS
w->thread_num = 1; /* for nicer DEBUG checklocks */
#endif
ub_thread_create(&ctx->bg_tid, libworker_dobg, w);
} else {
lock_basic_unlock(&ctx->cfglock);
#ifndef HAVE_FORK
/* no fork on windows */
return UB_FORKFAIL;
#else /* HAVE_FORK */
switch((ctx->bg_pid=fork())) {
case 0:
w = libworker_setup(ctx, 1, NULL);
if(!w) fatal_exit("out of memory");
/* close non-used parts of the pipes */
tube_close_write(ctx->qq_pipe);
tube_close_read(ctx->rr_pipe);
(void)libworker_dobg(w);
exit(0);
break;
case -1:
return UB_FORKFAIL;
default:
/* close non-used parts, so that the worker
* bgprocess gets 'pipe closed' when the
* main process exits */
tube_close_read(ctx->qq_pipe);
tube_close_write(ctx->rr_pipe);
break;
}
#endif /* HAVE_FORK */
}
return UB_NOERROR;
}
/** get msg reply struct (in temp region) */
static struct reply_info*
parse_reply(sldns_buffer* pkt, struct regional* region, struct query_info* qi)
{
struct reply_info* rep;
struct msg_parse* msg;
if(!(msg = regional_alloc(region, sizeof(*msg)))) {
return NULL;
}
memset(msg, 0, sizeof(*msg));
sldns_buffer_set_position(pkt, 0);
if(parse_packet(pkt, msg, region) != 0)
return 0;
if(!parse_create_msg(pkt, msg, NULL, qi, &rep, region)) {
return 0;
}
return rep;
}
/** insert canonname */
static int
fill_canon(struct ub_result* res, uint8_t* s)
{
char buf[255+2];
dname_str(s, buf);
res->canonname = strdup(buf);
return res->canonname != 0;
}
/** fill data into result */
static int
fill_res(struct ub_result* res, struct ub_packed_rrset_key* answer,
uint8_t* finalcname, struct query_info* rq, struct reply_info* rep)
{
size_t i;
struct packed_rrset_data* data;
res->ttl = 0;
if(!answer) {
if(finalcname) {
if(!fill_canon(res, finalcname))
return 0; /* out of memory */
}
if(rep->rrset_count != 0)
res->ttl = (int)rep->ttl;
res->data = (char**)calloc(1, sizeof(char*));
res->len = (int*)calloc(1, sizeof(int));
return (res->data && res->len);
}
data = (struct packed_rrset_data*)answer->entry.data;
if(query_dname_compare(rq->qname, answer->rk.dname) != 0) {
if(!fill_canon(res, answer->rk.dname))
return 0; /* out of memory */
} else res->canonname = NULL;
res->data = (char**)calloc(data->count+1, sizeof(char*));
res->len = (int*)calloc(data->count+1, sizeof(int));
if(!res->data || !res->len)
return 0; /* out of memory */
for(i=0; i<data->count; i++) {
/* remove rdlength from rdata */
res->len[i] = (int)(data->rr_len[i] - 2);
res->data[i] = memdup(data->rr_data[i]+2, (size_t)res->len[i]);
if(!res->data[i])
return 0; /* out of memory */
}
/* ttl for positive answers, from CNAME and answer RRs */
if(data->count != 0) {
size_t j;
res->ttl = (int)data->ttl;
for(j=0; j<rep->an_numrrsets; j++) {
struct packed_rrset_data* d =
(struct packed_rrset_data*)rep->rrsets[j]->
entry.data;
if((int)d->ttl < res->ttl)
res->ttl = (int)d->ttl;
}
}
/* ttl for negative answers */
if(data->count == 0 && rep->rrset_count != 0)
res->ttl = (int)rep->ttl;
res->data[data->count] = NULL;
res->len[data->count] = 0;
return 1;
}
/** fill result from parsed message, on error fills servfail */
void
libworker_enter_result(struct ub_result* res, sldns_buffer* buf,
struct regional* temp, enum sec_status msg_security)
{
struct query_info rq;
struct reply_info* rep;
res->rcode = LDNS_RCODE_SERVFAIL;
rep = parse_reply(buf, temp, &rq);
if(!rep) {
log_err("cannot parse buf");
return; /* error parsing buf, or out of memory */
}
if(!fill_res(res, reply_find_answer_rrset(&rq, rep),
reply_find_final_cname_target(&rq, rep), &rq, rep))
return; /* out of memory */
/* rcode, havedata, nxdomain, secure, bogus */
res->rcode = (int)FLAGS_GET_RCODE(rep->flags);
if(res->data && res->data[0])
res->havedata = 1;
if(res->rcode == LDNS_RCODE_NXDOMAIN)
res->nxdomain = 1;
if(msg_security == sec_status_secure)
res->secure = 1;
if(msg_security == sec_status_bogus)
res->bogus = 1;
}
/** fillup fg results */
static void
libworker_fillup_fg(struct ctx_query* q, int rcode, sldns_buffer* buf,
enum sec_status s, char* why_bogus)
{
if(why_bogus)
q->res->why_bogus = strdup(why_bogus);
if(rcode != 0) {
q->res->rcode = rcode;
q->msg_security = s;
return;
}
q->res->rcode = LDNS_RCODE_SERVFAIL;
q->msg_security = 0;
q->msg = memdup(sldns_buffer_begin(buf), sldns_buffer_limit(buf));
q->msg_len = sldns_buffer_limit(buf);
if(!q->msg) {
return; /* the error is in the rcode */
}
/* canonname and results */
q->msg_security = s;
libworker_enter_result(q->res, buf, q->w->env->scratch, s);
}
void
libworker_fg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
char* why_bogus)
{
struct ctx_query* q = (struct ctx_query*)arg;
/* fg query is done; exit comm base */
comm_base_exit(q->w->base);
libworker_fillup_fg(q, rcode, buf, s, why_bogus);
}
/** setup qinfo and edns */
static int
setup_qinfo_edns(struct libworker* w, struct ctx_query* q,
struct query_info* qinfo, struct edns_data* edns)
{
qinfo->qtype = (uint16_t)q->res->qtype;
qinfo->qclass = (uint16_t)q->res->qclass;
qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len);
if(!qinfo->qname) {
return 0;
}
edns->edns_present = 1;
edns->ext_rcode = 0;
edns->edns_version = 0;
edns->bits = EDNS_DO;
if(sldns_buffer_capacity(w->back->udp_buff) < 65535)
edns->udp_size = (uint16_t)sldns_buffer_capacity(
w->back->udp_buff);
else edns->udp_size = 65535;
return 1;
}
int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q)
{
struct libworker* w = libworker_setup(ctx, 0, NULL);
uint16_t qflags, qid;
struct query_info qinfo;
struct edns_data edns;
if(!w)
return UB_INITFAIL;
if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
libworker_delete(w);
return UB_SYNTAX;
}
qid = 0;
qflags = BIT_RD;
q->w = w;
/* see if there is a fixed answer */
sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
if(local_zones_answer(ctx->local_zones, &qinfo, &edns,
w->back->udp_buff, w->env->scratch)) {
regional_free_all(w->env->scratch);
libworker_fillup_fg(q, LDNS_RCODE_NOERROR,
w->back->udp_buff, sec_status_insecure, NULL);
libworker_delete(w);
free(qinfo.qname);
return UB_NOERROR;
}
/* process new query */
if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
w->back->udp_buff, qid, libworker_fg_done_cb, q)) {
free(qinfo.qname);
return UB_NOMEM;
}
free(qinfo.qname);
/* wait for reply */
comm_base_dispatch(w->base);
libworker_delete(w);
return UB_NOERROR;
}
void
libworker_event_done_cb(void* arg, int rcode, sldns_buffer* buf,
enum sec_status s, char* why_bogus)
{
struct ctx_query* q = (struct ctx_query*)arg;
ub_event_callback_t cb = (ub_event_callback_t)q->cb;
void* cb_arg = q->cb_arg;
int cancelled = q->cancelled;
/* delete it now */
struct ub_ctx* ctx = q->w->ctx;
lock_basic_lock(&ctx->cfglock);
(void)rbtree_delete(&ctx->queries, q->node.key);
ctx->num_async--;
context_query_delete(q);
lock_basic_unlock(&ctx->cfglock);
if(!cancelled) {
/* call callback */
int sec = 0;
if(s == sec_status_bogus)
sec = 1;
else if(s == sec_status_secure)
sec = 2;
(*cb)(cb_arg, rcode, (void*)sldns_buffer_begin(buf),
(int)sldns_buffer_limit(buf), sec, why_bogus);
}
}
int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q,
int* async_id)
{
struct libworker* w = ctx->event_worker;
uint16_t qflags, qid;
struct query_info qinfo;
struct edns_data edns;
if(!w)
return UB_INITFAIL;
if(!setup_qinfo_edns(w, q, &qinfo, &edns))
return UB_SYNTAX;
qid = 0;
qflags = BIT_RD;
q->w = w;
/* see if there is a fixed answer */
sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
if(local_zones_answer(ctx->local_zones, &qinfo, &edns,
w->back->udp_buff, w->env->scratch)) {
regional_free_all(w->env->scratch);
free(qinfo.qname);
libworker_event_done_cb(q, LDNS_RCODE_NOERROR,
w->back->udp_buff, sec_status_insecure, NULL);
return UB_NOERROR;
}
/* process new query */
if(async_id)
*async_id = q->querynum;
if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
w->back->udp_buff, qid, libworker_event_done_cb, q)) {
free(qinfo.qname);
return UB_NOMEM;
}
free(qinfo.qname);
return UB_NOERROR;
}
/** add result to the bg worker result queue */
static void
add_bg_result(struct libworker* w, struct ctx_query* q, sldns_buffer* pkt,
int err, char* reason)
{
uint8_t* msg = NULL;
uint32_t len = 0;
/* serialize and delete unneeded q */
if(w->is_bg_thread) {
lock_basic_lock(&w->ctx->cfglock);
if(reason)
q->res->why_bogus = strdup(reason);
if(pkt) {
q->msg_len = sldns_buffer_remaining(pkt);
q->msg = memdup(sldns_buffer_begin(pkt), q->msg_len);
if(!q->msg)
msg = context_serialize_answer(q, UB_NOMEM,
NULL, &len);
else msg = context_serialize_answer(q, err,
NULL, &len);
} else msg = context_serialize_answer(q, err, NULL, &len);
lock_basic_unlock(&w->ctx->cfglock);
} else {
if(reason)
q->res->why_bogus = strdup(reason);
msg = context_serialize_answer(q, err, pkt, &len);
(void)rbtree_delete(&w->ctx->queries, q->node.key);
w->ctx->num_async--;
context_query_delete(q);
}
if(!msg) {
log_err("out of memory for async answer");
return;
}
if(!tube_queue_item(w->ctx->rr_pipe, msg, len)) {
log_err("out of memory for async answer");
return;
}
}
void
libworker_bg_done_cb(void* arg, int rcode, sldns_buffer* buf, enum sec_status s,
char* why_bogus)
{
struct ctx_query* q = (struct ctx_query*)arg;
if(q->cancelled) {
if(q->w->is_bg_thread) {
/* delete it now */
struct ub_ctx* ctx = q->w->ctx;
lock_basic_lock(&ctx->cfglock);
(void)rbtree_delete(&ctx->queries, q->node.key);
ctx->num_async--;
context_query_delete(q);
lock_basic_unlock(&ctx->cfglock);
}
/* cancelled, do not give answer */
return;
}
q->msg_security = s;
if(!buf)
buf = q->w->env->scratch_buffer;
if(rcode != 0) {
error_encode(buf, rcode, NULL, 0, BIT_RD, NULL);
}
add_bg_result(q->w, q, buf, UB_NOERROR, why_bogus);
}
/** handle new query command for bg worker */
static void
handle_newq(struct libworker* w, uint8_t* buf, uint32_t len)
{
uint16_t qflags, qid;
struct query_info qinfo;
struct edns_data edns;
struct ctx_query* q;
if(w->is_bg_thread) {
lock_basic_lock(&w->ctx->cfglock);
q = context_lookup_new_query(w->ctx, buf, len);
lock_basic_unlock(&w->ctx->cfglock);
} else {
q = context_deserialize_new_query(w->ctx, buf, len);
}
free(buf);
if(!q) {
log_err("failed to deserialize newq");
return;
}
if(!setup_qinfo_edns(w, q, &qinfo, &edns)) {
add_bg_result(w, q, NULL, UB_SYNTAX, NULL);
return;
}
qid = 0;
qflags = BIT_RD;
/* see if there is a fixed answer */
sldns_buffer_write_u16_at(w->back->udp_buff, 0, qid);
sldns_buffer_write_u16_at(w->back->udp_buff, 2, qflags);
if(local_zones_answer(w->ctx->local_zones, &qinfo, &edns,
w->back->udp_buff, w->env->scratch)) {
regional_free_all(w->env->scratch);
q->msg_security = sec_status_insecure;
add_bg_result(w, q, w->back->udp_buff, UB_NOERROR, NULL);
free(qinfo.qname);
return;
}
q->w = w;
/* process new query */
if(!mesh_new_callback(w->env->mesh, &qinfo, qflags, &edns,
w->back->udp_buff, qid, libworker_bg_done_cb, q)) {
add_bg_result(w, q, NULL, UB_NOMEM, NULL);
}
free(qinfo.qname);
}
void libworker_alloc_cleanup(void* arg)
{
struct libworker* w = (struct libworker*)arg;
slabhash_clear(&w->env->rrset_cache->table);
slabhash_clear(w->env->msg_cache);
}
struct outbound_entry* libworker_send_query(uint8_t* qname, size_t qnamelen,
uint16_t qtype, uint16_t qclass, uint16_t flags, int dnssec,
int want_dnssec, int nocaps, struct sockaddr_storage* addr,
socklen_t addrlen, uint8_t* zone, size_t zonelen,
struct module_qstate* q)
{
struct libworker* w = (struct libworker*)q->env->worker;
struct outbound_entry* e = (struct outbound_entry*)regional_alloc(
q->region, sizeof(*e));
if(!e)
return NULL;
e->qstate = q;
e->qsent = outnet_serviced_query(w->back, qname,
qnamelen, qtype, qclass, flags, dnssec, want_dnssec, nocaps,
q->env->cfg->tcp_upstream, q->env->cfg->ssl_upstream, addr,
addrlen, zone, zonelen, libworker_handle_service_reply, e,
w->back->udp_buff);
if(!e->qsent) {
return NULL;
}
return e;
}
int
libworker_handle_reply(struct comm_point* c, void* arg, int error,
struct comm_reply* reply_info)
{
struct module_qstate* q = (struct module_qstate*)arg;
struct libworker* lw = (struct libworker*)q->env->worker;
struct outbound_entry e;
e.qstate = q;
e.qsent = NULL;
if(error != 0) {
mesh_report_reply(lw->env->mesh, &e, reply_info, error);
return 0;
}
/* sanity check. */
if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
|| LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
LDNS_PACKET_QUERY
|| LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
/* error becomes timeout for the module as if this reply
* never arrived. */
mesh_report_reply(lw->env->mesh, &e, reply_info,
NETEVENT_TIMEOUT);
return 0;
}
mesh_report_reply(lw->env->mesh, &e, reply_info, NETEVENT_NOERROR);
return 0;
}
int
libworker_handle_service_reply(struct comm_point* c, void* arg, int error,
struct comm_reply* reply_info)
{
struct outbound_entry* e = (struct outbound_entry*)arg;
struct libworker* lw = (struct libworker*)e->qstate->env->worker;
if(error != 0) {
mesh_report_reply(lw->env->mesh, e, reply_info, error);
return 0;
}
/* sanity check. */
if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
|| LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
LDNS_PACKET_QUERY
|| LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
/* error becomes timeout for the module as if this reply
* never arrived. */
mesh_report_reply(lw->env->mesh, e, reply_info,
NETEVENT_TIMEOUT);
return 0;
}
mesh_report_reply(lw->env->mesh, e, reply_info, NETEVENT_NOERROR);
return 0;
}
/* --- fake callbacks for fptr_wlist to work --- */
void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
{
log_assert(0);
}
int worker_handle_request(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(repinfo))
{
log_assert(0);
return 0;
}
int worker_handle_reply(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(reply_info))
{
log_assert(0);
return 0;
}
int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(reply_info))
{
log_assert(0);
return 0;
}
int remote_accept_callback(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(repinfo))
{
log_assert(0);
return 0;
}
int remote_control_callback(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(repinfo))
{
log_assert(0);
return 0;
}
void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg))
{
log_assert(0);
}
struct outbound_entry* worker_send_query(uint8_t* ATTR_UNUSED(qname),
size_t ATTR_UNUSED(qnamelen), uint16_t ATTR_UNUSED(qtype),
uint16_t ATTR_UNUSED(qclass), uint16_t ATTR_UNUSED(flags),
int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec),
int ATTR_UNUSED(nocaps), struct sockaddr_storage* ATTR_UNUSED(addr),
socklen_t ATTR_UNUSED(addrlen), uint8_t* ATTR_UNUSED(zone),
size_t ATTR_UNUSED(zonelen), struct module_qstate* ATTR_UNUSED(q))
{
log_assert(0);
return 0;
}
void
worker_alloc_cleanup(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
void worker_stat_timer_cb(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
void worker_probe_timer_cb(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
void worker_start_accept(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
void worker_stop_accept(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
int order_lock_cmp(const void* ATTR_UNUSED(e1), const void* ATTR_UNUSED(e2))
{
log_assert(0);
return 0;
}
int
codeline_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
{
log_assert(0);
return 0;
}
int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
{
log_assert(0);
return 0;
}
void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg))
{
log_assert(0);
}
#ifdef UB_ON_WINDOWS
void
worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void*
ATTR_UNUSED(arg)) {
log_assert(0);
}
void
wsvc_cron_cb(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
#endif /* UB_ON_WINDOWS */