wownero/external/unbound/libunbound/libworker.c
Erik de Castro Lopo a85b5759f3 Upgrade unbound library
These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).
2017-06-17 23:04:00 +10:00

1031 lines
27 KiB
C

/*
* 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 "sldns/sbuffer.h"
#include "sldns/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 ub_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,
cfg->outgoing_tcp_mss,
&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 ub_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->local_alias = NULL;
qinfo->qname = sldns_str2wire_dname(q->res->qname, &qinfo->qname_len);
if(!qinfo->qname) {
return 0;
}
qinfo->local_alias = NULL;
edns->edns_present = 1;
edns->ext_rcode = 0;
edns->edns_version = 0;
edns->bits = EDNS_DO;
edns->opt_list = NULL;
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, w->env, &qinfo, &edns,
w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
NULL, 0, NULL, 0, NULL)) {
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_type cb = (ub_event_callback_type)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, w->env, &qinfo, &edns,
w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
NULL, 0, NULL, 0, NULL)) {
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, w->env, &qinfo, &edns,
w->back->udp_buff, w->env->scratch, NULL, NULL, 0, NULL, 0,
NULL, 0, NULL, 0, NULL)) {
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(struct query_info* qinfo,
uint16_t flags, int dnssec, int want_dnssec, int nocaps,
struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone,
size_t zonelen, int ssl_upstream, 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, qinfo, flags, dnssec,
want_dnssec, nocaps, q->env->cfg->tcp_upstream, ssl_upstream,
addr, addrlen, zone, zonelen, q, libworker_handle_service_reply,
e, w->back->udp_buff, q->env);
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(struct query_info* ATTR_UNUSED(qinfo),
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),
int ATTR_UNUSED(ssl_upstream), 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 */