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https://git.wownero.com/wownero/wownero.git
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1453 lines
45 KiB
C
1453 lines
45 KiB
C
/*
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* daemon/worker.c - worker that handles a pending list of requests.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file implements the worker that handles callbacks on events, for
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* pending requests.
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*/
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#include "config.h"
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#include "util/log.h"
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#include "util/net_help.h"
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#include "util/random.h"
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#include "daemon/worker.h"
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#include "daemon/daemon.h"
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#include "daemon/remote.h"
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#include "daemon/acl_list.h"
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#include "util/netevent.h"
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#include "util/config_file.h"
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#include "util/module.h"
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#include "util/regional.h"
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#include "util/storage/slabhash.h"
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#include "services/listen_dnsport.h"
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#include "services/outside_network.h"
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#include "services/outbound_list.h"
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#include "services/cache/rrset.h"
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#include "services/cache/infra.h"
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#include "services/cache/dns.h"
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#include "services/mesh.h"
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#include "services/localzone.h"
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#include "util/data/msgparse.h"
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#include "util/data/msgencode.h"
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#include "util/data/dname.h"
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#include "util/fptr_wlist.h"
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#include "util/tube.h"
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#include "iterator/iter_fwd.h"
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#include "iterator/iter_hints.h"
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#include "validator/autotrust.h"
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#include "validator/val_anchor.h"
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#include "libunbound/context.h"
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#include "libunbound/libworker.h"
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#include "sldns/sbuffer.h"
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#include <signal.h>
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#ifdef UB_ON_WINDOWS
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#include "winrc/win_svc.h"
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#endif
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/** Size of an UDP datagram */
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#define NORMAL_UDP_SIZE 512 /* bytes */
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/**
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* seconds to add to prefetch leeway. This is a TTL that expires old rrsets
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* earlier than they should in order to put the new update into the cache.
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* This additional value is to make sure that if not all TTLs are equal in
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* the message to be updated(and replaced), that rrsets with up to this much
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* extra TTL are also replaced. This means that the resulting new message
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* will have (most likely) this TTL at least, avoiding very small 'split
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* second' TTLs due to operators choosing relative primes for TTLs (or so).
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* Also has to be at least one to break ties (and overwrite cached entry).
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*/
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#define PREFETCH_EXPIRY_ADD 60
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#ifdef UNBOUND_ALLOC_STATS
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/** measure memory leakage */
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static void
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debug_memleak(size_t accounted, size_t heap,
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size_t total_alloc, size_t total_free)
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{
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static int init = 0;
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static size_t base_heap, base_accounted, base_alloc, base_free;
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size_t base_af, cur_af, grow_af, grow_acc;
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if(!init) {
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init = 1;
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base_heap = heap;
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base_accounted = accounted;
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base_alloc = total_alloc;
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base_free = total_free;
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}
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base_af = base_alloc - base_free;
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cur_af = total_alloc - total_free;
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grow_af = cur_af - base_af;
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grow_acc = accounted - base_accounted;
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log_info("Leakage: %d leaked. growth: %u use, %u acc, %u heap",
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(int)(grow_af - grow_acc), (unsigned)grow_af,
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(unsigned)grow_acc, (unsigned)(heap - base_heap));
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}
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/** give debug heap size indication */
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static void
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debug_total_mem(size_t calctotal)
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{
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#ifdef HAVE_SBRK
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extern void* unbound_start_brk;
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extern size_t unbound_mem_alloc, unbound_mem_freed;
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void* cur = sbrk(0);
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int total = cur-unbound_start_brk;
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log_info("Total heap memory estimate: %u total-alloc: %u "
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"total-free: %u", (unsigned)total,
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(unsigned)unbound_mem_alloc, (unsigned)unbound_mem_freed);
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debug_memleak(calctotal, (size_t)total,
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unbound_mem_alloc, unbound_mem_freed);
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#else
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(void)calctotal;
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#endif /* HAVE_SBRK */
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}
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#endif /* UNBOUND_ALLOC_STATS */
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/** Report on memory usage by this thread and global */
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static void
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worker_mem_report(struct worker* ATTR_UNUSED(worker),
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struct serviced_query* ATTR_UNUSED(cur_serv))
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{
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#ifdef UNBOUND_ALLOC_STATS
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/* debug func in validator module */
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size_t total, front, back, mesh, msg, rrset, infra, ac, superac;
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size_t me, iter, val, anch;
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int i;
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if(verbosity < VERB_ALGO)
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return;
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front = listen_get_mem(worker->front);
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back = outnet_get_mem(worker->back);
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msg = slabhash_get_mem(worker->env.msg_cache);
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rrset = slabhash_get_mem(&worker->env.rrset_cache->table);
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infra = infra_get_mem(worker->env.infra_cache);
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mesh = mesh_get_mem(worker->env.mesh);
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ac = alloc_get_mem(&worker->alloc);
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superac = alloc_get_mem(&worker->daemon->superalloc);
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anch = anchors_get_mem(worker->env.anchors);
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iter = 0;
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val = 0;
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for(i=0; i<worker->env.mesh->mods.num; i++) {
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fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->
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mods.mod[i]->get_mem));
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if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0)
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val += (*worker->env.mesh->mods.mod[i]->get_mem)
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(&worker->env, i);
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else iter += (*worker->env.mesh->mods.mod[i]->get_mem)
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(&worker->env, i);
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}
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me = sizeof(*worker) + sizeof(*worker->base) + sizeof(*worker->comsig)
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+ comm_point_get_mem(worker->cmd_com)
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+ sizeof(worker->rndstate)
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+ regional_get_mem(worker->scratchpad)
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+ sizeof(*worker->env.scratch_buffer)
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+ sldns_buffer_capacity(worker->env.scratch_buffer)
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+ forwards_get_mem(worker->env.fwds)
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+ hints_get_mem(worker->env.hints);
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if(worker->thread_num == 0)
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me += acl_list_get_mem(worker->daemon->acl);
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if(cur_serv) {
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me += serviced_get_mem(cur_serv);
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}
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total = front+back+mesh+msg+rrset+infra+iter+val+ac+superac+me;
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log_info("Memory conditions: %u front=%u back=%u mesh=%u msg=%u "
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"rrset=%u infra=%u iter=%u val=%u anchors=%u "
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"alloccache=%u globalalloccache=%u me=%u",
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(unsigned)total, (unsigned)front, (unsigned)back,
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(unsigned)mesh, (unsigned)msg, (unsigned)rrset,
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(unsigned)infra, (unsigned)iter, (unsigned)val, (unsigned)anch,
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(unsigned)ac, (unsigned)superac, (unsigned)me);
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debug_total_mem(total);
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#else /* no UNBOUND_ALLOC_STATS */
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size_t val = 0;
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int i;
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if(verbosity < VERB_QUERY)
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return;
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for(i=0; i<worker->env.mesh->mods.num; i++) {
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fptr_ok(fptr_whitelist_mod_get_mem(worker->env.mesh->
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mods.mod[i]->get_mem));
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if(strcmp(worker->env.mesh->mods.mod[i]->name, "validator")==0)
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val += (*worker->env.mesh->mods.mod[i]->get_mem)
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(&worker->env, i);
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}
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verbose(VERB_QUERY, "cache memory msg=%u rrset=%u infra=%u val=%u",
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(unsigned)slabhash_get_mem(worker->env.msg_cache),
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(unsigned)slabhash_get_mem(&worker->env.rrset_cache->table),
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(unsigned)infra_get_mem(worker->env.infra_cache),
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(unsigned)val);
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#endif /* UNBOUND_ALLOC_STATS */
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}
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void
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worker_send_cmd(struct worker* worker, enum worker_commands cmd)
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{
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uint32_t c = (uint32_t)htonl(cmd);
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if(!tube_write_msg(worker->cmd, (uint8_t*)&c, sizeof(c), 0)) {
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log_err("worker send cmd %d failed", (int)cmd);
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}
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}
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int
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worker_handle_reply(struct comm_point* c, void* arg, int error,
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struct comm_reply* reply_info)
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{
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struct module_qstate* q = (struct module_qstate*)arg;
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struct worker* worker = q->env->worker;
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struct outbound_entry e;
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e.qstate = q;
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e.qsent = NULL;
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if(error != 0) {
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mesh_report_reply(worker->env.mesh, &e, reply_info, error);
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worker_mem_report(worker, NULL);
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return 0;
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}
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/* sanity check. */
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if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
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|| LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
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LDNS_PACKET_QUERY
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|| LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
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/* error becomes timeout for the module as if this reply
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* never arrived. */
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mesh_report_reply(worker->env.mesh, &e, reply_info,
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NETEVENT_TIMEOUT);
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worker_mem_report(worker, NULL);
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return 0;
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}
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mesh_report_reply(worker->env.mesh, &e, reply_info, NETEVENT_NOERROR);
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worker_mem_report(worker, NULL);
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return 0;
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}
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int
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worker_handle_service_reply(struct comm_point* c, void* arg, int error,
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struct comm_reply* reply_info)
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{
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struct outbound_entry* e = (struct outbound_entry*)arg;
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struct worker* worker = e->qstate->env->worker;
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struct serviced_query *sq = e->qsent;
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verbose(VERB_ALGO, "worker svcd callback for qstate %p", e->qstate);
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if(error != 0) {
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mesh_report_reply(worker->env.mesh, e, reply_info, error);
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worker_mem_report(worker, sq);
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return 0;
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}
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/* sanity check. */
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if(!LDNS_QR_WIRE(sldns_buffer_begin(c->buffer))
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|| LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) !=
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LDNS_PACKET_QUERY
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|| LDNS_QDCOUNT(sldns_buffer_begin(c->buffer)) > 1) {
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/* error becomes timeout for the module as if this reply
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* never arrived. */
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verbose(VERB_ALGO, "worker: bad reply handled as timeout");
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mesh_report_reply(worker->env.mesh, e, reply_info,
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NETEVENT_TIMEOUT);
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worker_mem_report(worker, sq);
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return 0;
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}
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mesh_report_reply(worker->env.mesh, e, reply_info, NETEVENT_NOERROR);
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worker_mem_report(worker, sq);
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return 0;
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}
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/** check request sanity.
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* @param pkt: the wire packet to examine for sanity.
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* @param worker: parameters for checking.
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* @return error code, 0 OK, or -1 discard.
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*/
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static int
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worker_check_request(sldns_buffer* pkt, struct worker* worker)
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{
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if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) {
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verbose(VERB_QUERY, "request too short, discarded");
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return -1;
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}
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if(sldns_buffer_limit(pkt) > NORMAL_UDP_SIZE &&
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worker->daemon->cfg->harden_large_queries) {
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verbose(VERB_QUERY, "request too large, discarded");
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return -1;
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}
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if(LDNS_QR_WIRE(sldns_buffer_begin(pkt))) {
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verbose(VERB_QUERY, "request has QR bit on, discarded");
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return -1;
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}
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if(LDNS_TC_WIRE(sldns_buffer_begin(pkt))) {
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LDNS_TC_CLR(sldns_buffer_begin(pkt));
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verbose(VERB_QUERY, "request bad, has TC bit on");
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return LDNS_RCODE_FORMERR;
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}
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if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY) {
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verbose(VERB_QUERY, "request unknown opcode %d",
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LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)));
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return LDNS_RCODE_NOTIMPL;
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}
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if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1) {
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verbose(VERB_QUERY, "request wrong nr qd=%d",
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LDNS_QDCOUNT(sldns_buffer_begin(pkt)));
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return LDNS_RCODE_FORMERR;
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}
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if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) != 0) {
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verbose(VERB_QUERY, "request wrong nr an=%d",
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LDNS_ANCOUNT(sldns_buffer_begin(pkt)));
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return LDNS_RCODE_FORMERR;
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}
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if(LDNS_NSCOUNT(sldns_buffer_begin(pkt)) != 0) {
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verbose(VERB_QUERY, "request wrong nr ns=%d",
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LDNS_NSCOUNT(sldns_buffer_begin(pkt)));
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return LDNS_RCODE_FORMERR;
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}
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if(LDNS_ARCOUNT(sldns_buffer_begin(pkt)) > 1) {
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verbose(VERB_QUERY, "request wrong nr ar=%d",
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LDNS_ARCOUNT(sldns_buffer_begin(pkt)));
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return LDNS_RCODE_FORMERR;
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}
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return 0;
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}
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void
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worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube), uint8_t* msg,
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size_t len, int error, void* arg)
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{
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struct worker* worker = (struct worker*)arg;
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enum worker_commands cmd;
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if(error != NETEVENT_NOERROR) {
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free(msg);
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if(error == NETEVENT_CLOSED)
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comm_base_exit(worker->base);
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else log_info("control event: %d", error);
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return;
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}
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if(len != sizeof(uint32_t)) {
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fatal_exit("bad control msg length %d", (int)len);
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}
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cmd = sldns_read_uint32(msg);
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free(msg);
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switch(cmd) {
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case worker_cmd_quit:
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verbose(VERB_ALGO, "got control cmd quit");
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comm_base_exit(worker->base);
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break;
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case worker_cmd_stats:
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verbose(VERB_ALGO, "got control cmd stats");
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server_stats_reply(worker, 1);
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break;
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case worker_cmd_stats_noreset:
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verbose(VERB_ALGO, "got control cmd stats_noreset");
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server_stats_reply(worker, 0);
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break;
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case worker_cmd_remote:
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verbose(VERB_ALGO, "got control cmd remote");
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daemon_remote_exec(worker);
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break;
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default:
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log_err("bad command %d", (int)cmd);
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break;
|
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}
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}
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|
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/** check if a delegation is secure */
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static enum sec_status
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check_delegation_secure(struct reply_info *rep)
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{
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/* return smallest security status */
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size_t i;
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enum sec_status sec = sec_status_secure;
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enum sec_status s;
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size_t num = rep->an_numrrsets + rep->ns_numrrsets;
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/* check if answer and authority are OK */
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for(i=0; i<num; i++) {
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s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
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->security;
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if(s < sec)
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sec = s;
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}
|
|
/* in additional, only unchecked triggers revalidation */
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|
for(i=num; i<rep->rrset_count; i++) {
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s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
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|
->security;
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if(s == sec_status_unchecked)
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return s;
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}
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return sec;
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}
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|
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/** remove nonsecure from a delegation referral additional section */
|
|
static void
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deleg_remove_nonsecure_additional(struct reply_info* rep)
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|
{
|
|
/* we can simply edit it, since we are working in the scratch region */
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|
size_t i;
|
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enum sec_status s;
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for(i = rep->an_numrrsets+rep->ns_numrrsets; i<rep->rrset_count; i++) {
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s = ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
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->security;
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if(s != sec_status_secure) {
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memmove(rep->rrsets+i, rep->rrsets+i+1,
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sizeof(struct ub_packed_rrset_key*)*
|
|
(rep->rrset_count - i - 1));
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|
rep->ar_numrrsets--;
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rep->rrset_count--;
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i--;
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}
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}
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}
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|
|
/** answer nonrecursive query from the cache */
|
|
static int
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|
answer_norec_from_cache(struct worker* worker, struct query_info* qinfo,
|
|
uint16_t id, uint16_t flags, struct comm_reply* repinfo,
|
|
struct edns_data* edns)
|
|
{
|
|
/* for a nonrecursive query return either:
|
|
* o an error (servfail; we try to avoid this)
|
|
* o a delegation (closest we have; this routine tries that)
|
|
* o the answer (checked by answer_from_cache)
|
|
*
|
|
* So, grab a delegation from the rrset cache.
|
|
* Then check if it needs validation, if so, this routine fails,
|
|
* so that iterator can prime and validator can verify rrsets.
|
|
*/
|
|
uint16_t udpsize = edns->udp_size;
|
|
int secure = 0;
|
|
time_t timenow = *worker->env.now;
|
|
int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd)
|
|
&& worker->env.need_to_validate;
|
|
struct dns_msg *msg = NULL;
|
|
struct delegpt *dp;
|
|
|
|
dp = dns_cache_find_delegation(&worker->env, qinfo->qname,
|
|
qinfo->qname_len, qinfo->qtype, qinfo->qclass,
|
|
worker->scratchpad, &msg, timenow);
|
|
if(!dp) { /* no delegation, need to reprime */
|
|
regional_free_all(worker->scratchpad);
|
|
return 0;
|
|
}
|
|
if(must_validate) {
|
|
switch(check_delegation_secure(msg->rep)) {
|
|
case sec_status_unchecked:
|
|
/* some rrsets have not been verified yet, go and
|
|
* let validator do that */
|
|
regional_free_all(worker->scratchpad);
|
|
return 0;
|
|
case sec_status_bogus:
|
|
/* some rrsets are bogus, reply servfail */
|
|
edns->edns_version = EDNS_ADVERTISED_VERSION;
|
|
edns->udp_size = EDNS_ADVERTISED_SIZE;
|
|
edns->ext_rcode = 0;
|
|
edns->bits &= EDNS_DO;
|
|
error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
|
|
&msg->qinfo, id, flags, edns);
|
|
regional_free_all(worker->scratchpad);
|
|
if(worker->stats.extended) {
|
|
worker->stats.ans_bogus++;
|
|
worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL]++;
|
|
}
|
|
return 1;
|
|
case sec_status_secure:
|
|
/* all rrsets are secure */
|
|
/* remove non-secure rrsets from the add. section*/
|
|
if(worker->env.cfg->val_clean_additional)
|
|
deleg_remove_nonsecure_additional(msg->rep);
|
|
secure = 1;
|
|
break;
|
|
case sec_status_indeterminate:
|
|
case sec_status_insecure:
|
|
default:
|
|
/* not secure */
|
|
secure = 0;
|
|
break;
|
|
}
|
|
}
|
|
/* return this delegation from the cache */
|
|
edns->edns_version = EDNS_ADVERTISED_VERSION;
|
|
edns->udp_size = EDNS_ADVERTISED_SIZE;
|
|
edns->ext_rcode = 0;
|
|
edns->bits &= EDNS_DO;
|
|
msg->rep->flags |= BIT_QR|BIT_RA;
|
|
if(!reply_info_answer_encode(&msg->qinfo, msg->rep, id, flags,
|
|
repinfo->c->buffer, 0, 1, worker->scratchpad,
|
|
udpsize, edns, (int)(edns->bits & EDNS_DO), secure)) {
|
|
error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
|
|
&msg->qinfo, id, flags, edns);
|
|
}
|
|
regional_free_all(worker->scratchpad);
|
|
if(worker->stats.extended) {
|
|
if(secure) worker->stats.ans_secure++;
|
|
server_stats_insrcode(&worker->stats, repinfo->c->buffer);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/** answer query from the cache */
|
|
static int
|
|
answer_from_cache(struct worker* worker, struct query_info* qinfo,
|
|
struct reply_info* rep, uint16_t id, uint16_t flags,
|
|
struct comm_reply* repinfo, struct edns_data* edns)
|
|
{
|
|
time_t timenow = *worker->env.now;
|
|
uint16_t udpsize = edns->udp_size;
|
|
int secure;
|
|
int must_validate = (!(flags&BIT_CD) || worker->env.cfg->ignore_cd)
|
|
&& worker->env.need_to_validate;
|
|
/* see if it is possible */
|
|
if(rep->ttl < timenow) {
|
|
/* the rrsets may have been updated in the meantime.
|
|
* we will refetch the message format from the
|
|
* authoritative server
|
|
*/
|
|
return 0;
|
|
}
|
|
if(!rrset_array_lock(rep->ref, rep->rrset_count, timenow))
|
|
return 0;
|
|
/* locked and ids and ttls are OK. */
|
|
/* check CNAME chain (if any) */
|
|
if(rep->an_numrrsets > 0 && (rep->rrsets[0]->rk.type ==
|
|
htons(LDNS_RR_TYPE_CNAME) || rep->rrsets[0]->rk.type ==
|
|
htons(LDNS_RR_TYPE_DNAME))) {
|
|
if(!reply_check_cname_chain(rep)) {
|
|
/* cname chain invalid, redo iterator steps */
|
|
verbose(VERB_ALGO, "Cache reply: cname chain broken");
|
|
bail_out:
|
|
rrset_array_unlock_touch(worker->env.rrset_cache,
|
|
worker->scratchpad, rep->ref, rep->rrset_count);
|
|
regional_free_all(worker->scratchpad);
|
|
return 0;
|
|
}
|
|
}
|
|
/* check security status of the cached answer */
|
|
if( rep->security == sec_status_bogus && must_validate) {
|
|
/* BAD cached */
|
|
edns->edns_version = EDNS_ADVERTISED_VERSION;
|
|
edns->udp_size = EDNS_ADVERTISED_SIZE;
|
|
edns->ext_rcode = 0;
|
|
edns->bits &= EDNS_DO;
|
|
error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
|
|
qinfo, id, flags, edns);
|
|
rrset_array_unlock_touch(worker->env.rrset_cache,
|
|
worker->scratchpad, rep->ref, rep->rrset_count);
|
|
regional_free_all(worker->scratchpad);
|
|
if(worker->stats.extended) {
|
|
worker->stats.ans_bogus ++;
|
|
worker->stats.ans_rcode[LDNS_RCODE_SERVFAIL] ++;
|
|
}
|
|
return 1;
|
|
} else if( rep->security == sec_status_unchecked && must_validate) {
|
|
verbose(VERB_ALGO, "Cache reply: unchecked entry needs "
|
|
"validation");
|
|
goto bail_out; /* need to validate cache entry first */
|
|
} else if(rep->security == sec_status_secure) {
|
|
if(reply_all_rrsets_secure(rep))
|
|
secure = 1;
|
|
else {
|
|
if(must_validate) {
|
|
verbose(VERB_ALGO, "Cache reply: secure entry"
|
|
" changed status");
|
|
goto bail_out; /* rrset changed, re-verify */
|
|
}
|
|
secure = 0;
|
|
}
|
|
} else secure = 0;
|
|
|
|
edns->edns_version = EDNS_ADVERTISED_VERSION;
|
|
edns->udp_size = EDNS_ADVERTISED_SIZE;
|
|
edns->ext_rcode = 0;
|
|
edns->bits &= EDNS_DO;
|
|
if(!reply_info_answer_encode(qinfo, rep, id, flags,
|
|
repinfo->c->buffer, timenow, 1, worker->scratchpad,
|
|
udpsize, edns, (int)(edns->bits & EDNS_DO), secure)) {
|
|
error_encode(repinfo->c->buffer, LDNS_RCODE_SERVFAIL,
|
|
qinfo, id, flags, edns);
|
|
}
|
|
/* cannot send the reply right now, because blocking network syscall
|
|
* is bad while holding locks. */
|
|
rrset_array_unlock_touch(worker->env.rrset_cache, worker->scratchpad,
|
|
rep->ref, rep->rrset_count);
|
|
regional_free_all(worker->scratchpad);
|
|
if(worker->stats.extended) {
|
|
if(secure) worker->stats.ans_secure++;
|
|
server_stats_insrcode(&worker->stats, repinfo->c->buffer);
|
|
}
|
|
/* go and return this buffer to the client */
|
|
return 1;
|
|
}
|
|
|
|
/** Reply to client and perform prefetch to keep cache up to date */
|
|
static void
|
|
reply_and_prefetch(struct worker* worker, struct query_info* qinfo,
|
|
uint16_t flags, struct comm_reply* repinfo, time_t leeway)
|
|
{
|
|
/* first send answer to client to keep its latency
|
|
* as small as a cachereply */
|
|
comm_point_send_reply(repinfo);
|
|
server_stats_prefetch(&worker->stats, worker);
|
|
|
|
/* create the prefetch in the mesh as a normal lookup without
|
|
* client addrs waiting, which has the cache blacklisted (to bypass
|
|
* the cache and go to the network for the data). */
|
|
/* this (potentially) runs the mesh for the new query */
|
|
mesh_new_prefetch(worker->env.mesh, qinfo, flags, leeway +
|
|
PREFETCH_EXPIRY_ADD);
|
|
}
|
|
|
|
/**
|
|
* Fill CH class answer into buffer. Keeps query.
|
|
* @param pkt: buffer
|
|
* @param str: string to put into text record (<255).
|
|
* @param edns: edns reply information.
|
|
*/
|
|
static void
|
|
chaos_replystr(sldns_buffer* pkt, const char* str, struct edns_data* edns)
|
|
{
|
|
size_t len = strlen(str);
|
|
unsigned int rd = LDNS_RD_WIRE(sldns_buffer_begin(pkt));
|
|
unsigned int cd = LDNS_CD_WIRE(sldns_buffer_begin(pkt));
|
|
if(len>255) len=255; /* cap size of TXT record */
|
|
sldns_buffer_clear(pkt);
|
|
sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip id */
|
|
sldns_buffer_write_u16(pkt, (uint16_t)(BIT_QR|BIT_RA));
|
|
if(rd) LDNS_RD_SET(sldns_buffer_begin(pkt));
|
|
if(cd) LDNS_CD_SET(sldns_buffer_begin(pkt));
|
|
sldns_buffer_write_u16(pkt, 1); /* qdcount */
|
|
sldns_buffer_write_u16(pkt, 1); /* ancount */
|
|
sldns_buffer_write_u16(pkt, 0); /* nscount */
|
|
sldns_buffer_write_u16(pkt, 0); /* arcount */
|
|
(void)query_dname_len(pkt); /* skip qname */
|
|
sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qtype */
|
|
sldns_buffer_skip(pkt, (ssize_t)sizeof(uint16_t)); /* skip qclass */
|
|
sldns_buffer_write_u16(pkt, 0xc00c); /* compr ptr to query */
|
|
sldns_buffer_write_u16(pkt, LDNS_RR_TYPE_TXT);
|
|
sldns_buffer_write_u16(pkt, LDNS_RR_CLASS_CH);
|
|
sldns_buffer_write_u32(pkt, 0); /* TTL */
|
|
sldns_buffer_write_u16(pkt, sizeof(uint8_t) + len);
|
|
sldns_buffer_write_u8(pkt, len);
|
|
sldns_buffer_write(pkt, str, len);
|
|
sldns_buffer_flip(pkt);
|
|
edns->edns_version = EDNS_ADVERTISED_VERSION;
|
|
edns->udp_size = EDNS_ADVERTISED_SIZE;
|
|
edns->bits &= EDNS_DO;
|
|
attach_edns_record(pkt, edns);
|
|
}
|
|
|
|
/**
|
|
* Answer CH class queries.
|
|
* @param w: worker
|
|
* @param qinfo: query info. Pointer into packet buffer.
|
|
* @param edns: edns info from query.
|
|
* @param pkt: packet buffer.
|
|
* @return: true if a reply is to be sent.
|
|
*/
|
|
static int
|
|
answer_chaos(struct worker* w, struct query_info* qinfo,
|
|
struct edns_data* edns, sldns_buffer* pkt)
|
|
{
|
|
struct config_file* cfg = w->env.cfg;
|
|
if(qinfo->qtype != LDNS_RR_TYPE_ANY && qinfo->qtype != LDNS_RR_TYPE_TXT)
|
|
return 0;
|
|
if(query_dname_compare(qinfo->qname,
|
|
(uint8_t*)"\002id\006server") == 0 ||
|
|
query_dname_compare(qinfo->qname,
|
|
(uint8_t*)"\010hostname\004bind") == 0)
|
|
{
|
|
if(cfg->hide_identity)
|
|
return 0;
|
|
if(cfg->identity==NULL || cfg->identity[0]==0) {
|
|
char buf[MAXHOSTNAMELEN+1];
|
|
if (gethostname(buf, MAXHOSTNAMELEN) == 0) {
|
|
buf[MAXHOSTNAMELEN] = 0;
|
|
chaos_replystr(pkt, buf, edns);
|
|
} else {
|
|
log_err("gethostname: %s", strerror(errno));
|
|
chaos_replystr(pkt, "no hostname", edns);
|
|
}
|
|
}
|
|
else chaos_replystr(pkt, cfg->identity, edns);
|
|
return 1;
|
|
}
|
|
if(query_dname_compare(qinfo->qname,
|
|
(uint8_t*)"\007version\006server") == 0 ||
|
|
query_dname_compare(qinfo->qname,
|
|
(uint8_t*)"\007version\004bind") == 0)
|
|
{
|
|
if(cfg->hide_version)
|
|
return 0;
|
|
if(cfg->version==NULL || cfg->version[0]==0)
|
|
chaos_replystr(pkt, PACKAGE_STRING, edns);
|
|
else chaos_replystr(pkt, cfg->version, edns);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
deny_refuse(struct comm_point* c, enum acl_access acl,
|
|
enum acl_access deny, enum acl_access refuse,
|
|
struct worker* worker, struct comm_reply* repinfo)
|
|
{
|
|
if(acl == deny) {
|
|
comm_point_drop_reply(repinfo);
|
|
if(worker->stats.extended)
|
|
worker->stats.unwanted_queries++;
|
|
return 0;
|
|
} else if(acl == refuse) {
|
|
log_addr(VERB_ALGO, "refused query from",
|
|
&repinfo->addr, repinfo->addrlen);
|
|
log_buf(VERB_ALGO, "refuse", c->buffer);
|
|
if(worker->stats.extended)
|
|
worker->stats.unwanted_queries++;
|
|
if(worker_check_request(c->buffer, worker) == -1) {
|
|
comm_point_drop_reply(repinfo);
|
|
return 0; /* discard this */
|
|
}
|
|
sldns_buffer_set_limit(c->buffer, LDNS_HEADER_SIZE);
|
|
sldns_buffer_write_at(c->buffer, 4,
|
|
(uint8_t*)"\0\0\0\0\0\0\0\0", 8);
|
|
LDNS_QR_SET(sldns_buffer_begin(c->buffer));
|
|
LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
|
|
LDNS_RCODE_REFUSED);
|
|
return 1;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
deny_refuse_all(struct comm_point* c, enum acl_access acl,
|
|
struct worker* worker, struct comm_reply* repinfo)
|
|
{
|
|
return deny_refuse(c, acl, acl_deny, acl_refuse, worker, repinfo);
|
|
}
|
|
|
|
static int
|
|
deny_refuse_non_local(struct comm_point* c, enum acl_access acl,
|
|
struct worker* worker, struct comm_reply* repinfo)
|
|
{
|
|
return deny_refuse(c, acl, acl_deny_non_local, acl_refuse_non_local, worker, repinfo);
|
|
}
|
|
|
|
int
|
|
worker_handle_request(struct comm_point* c, void* arg, int error,
|
|
struct comm_reply* repinfo)
|
|
{
|
|
struct worker* worker = (struct worker*)arg;
|
|
int ret;
|
|
hashvalue_t h;
|
|
struct lruhash_entry* e;
|
|
struct query_info qinfo;
|
|
struct edns_data edns;
|
|
enum acl_access acl;
|
|
int rc = 0;
|
|
|
|
if(error != NETEVENT_NOERROR) {
|
|
/* some bad tcp query DNS formats give these error calls */
|
|
verbose(VERB_ALGO, "handle request called with err=%d", error);
|
|
return 0;
|
|
}
|
|
#ifdef USE_DNSTAP
|
|
if(worker->dtenv.log_client_query_messages)
|
|
dt_msg_send_client_query(&worker->dtenv, &repinfo->addr, c->type,
|
|
c->buffer);
|
|
#endif
|
|
acl = acl_list_lookup(worker->daemon->acl, &repinfo->addr,
|
|
repinfo->addrlen);
|
|
if((ret=deny_refuse_all(c, acl, worker, repinfo)) != -1)
|
|
{
|
|
if(ret == 1)
|
|
goto send_reply;
|
|
return ret;
|
|
}
|
|
if((ret=worker_check_request(c->buffer, worker)) != 0) {
|
|
verbose(VERB_ALGO, "worker check request: bad query.");
|
|
log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
|
|
if(ret != -1) {
|
|
LDNS_QR_SET(sldns_buffer_begin(c->buffer));
|
|
LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret);
|
|
return 1;
|
|
}
|
|
comm_point_drop_reply(repinfo);
|
|
return 0;
|
|
}
|
|
worker->stats.num_queries++;
|
|
/* see if query is in the cache */
|
|
if(!query_info_parse(&qinfo, c->buffer)) {
|
|
verbose(VERB_ALGO, "worker parse request: formerror.");
|
|
log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
|
|
sldns_buffer_rewind(c->buffer);
|
|
LDNS_QR_SET(sldns_buffer_begin(c->buffer));
|
|
LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
|
|
LDNS_RCODE_FORMERR);
|
|
server_stats_insrcode(&worker->stats, c->buffer);
|
|
goto send_reply;
|
|
}
|
|
if(worker->env.cfg->log_queries) {
|
|
char ip[128];
|
|
addr_to_str(&repinfo->addr, repinfo->addrlen, ip, sizeof(ip));
|
|
log_nametypeclass(0, ip, qinfo.qname, qinfo.qtype, qinfo.qclass);
|
|
}
|
|
if(qinfo.qtype == LDNS_RR_TYPE_AXFR ||
|
|
qinfo.qtype == LDNS_RR_TYPE_IXFR) {
|
|
verbose(VERB_ALGO, "worker request: refused zone transfer.");
|
|
log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
|
|
sldns_buffer_rewind(c->buffer);
|
|
LDNS_QR_SET(sldns_buffer_begin(c->buffer));
|
|
LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
|
|
LDNS_RCODE_REFUSED);
|
|
if(worker->stats.extended) {
|
|
worker->stats.qtype[qinfo.qtype]++;
|
|
server_stats_insrcode(&worker->stats, c->buffer);
|
|
}
|
|
goto send_reply;
|
|
}
|
|
if((ret=parse_edns_from_pkt(c->buffer, &edns)) != 0) {
|
|
verbose(VERB_ALGO, "worker parse edns: formerror.");
|
|
log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
|
|
sldns_buffer_rewind(c->buffer);
|
|
LDNS_QR_SET(sldns_buffer_begin(c->buffer));
|
|
LDNS_RCODE_SET(sldns_buffer_begin(c->buffer), ret);
|
|
server_stats_insrcode(&worker->stats, c->buffer);
|
|
goto send_reply;
|
|
}
|
|
if(edns.edns_present && edns.edns_version != 0) {
|
|
edns.ext_rcode = (uint8_t)(EDNS_RCODE_BADVERS>>4);
|
|
edns.edns_version = EDNS_ADVERTISED_VERSION;
|
|
edns.udp_size = EDNS_ADVERTISED_SIZE;
|
|
edns.bits &= EDNS_DO;
|
|
verbose(VERB_ALGO, "query with bad edns version.");
|
|
log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
|
|
error_encode(c->buffer, EDNS_RCODE_BADVERS&0xf, &qinfo,
|
|
*(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
|
|
sldns_buffer_read_u16_at(c->buffer, 2), NULL);
|
|
attach_edns_record(c->buffer, &edns);
|
|
goto send_reply;
|
|
}
|
|
if(edns.edns_present && edns.udp_size < NORMAL_UDP_SIZE &&
|
|
worker->daemon->cfg->harden_short_bufsize) {
|
|
verbose(VERB_QUERY, "worker request: EDNS bufsize %d ignored",
|
|
(int)edns.udp_size);
|
|
log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
|
|
edns.udp_size = NORMAL_UDP_SIZE;
|
|
}
|
|
if(edns.udp_size > worker->daemon->cfg->max_udp_size &&
|
|
c->type == comm_udp) {
|
|
verbose(VERB_QUERY,
|
|
"worker request: max UDP reply size modified"
|
|
" (%d to max-udp-size)", (int)edns.udp_size);
|
|
log_addr(VERB_CLIENT,"from",&repinfo->addr, repinfo->addrlen);
|
|
edns.udp_size = worker->daemon->cfg->max_udp_size;
|
|
}
|
|
if(edns.udp_size < LDNS_HEADER_SIZE) {
|
|
verbose(VERB_ALGO, "worker request: edns is too small.");
|
|
log_addr(VERB_CLIENT, "from", &repinfo->addr, repinfo->addrlen);
|
|
LDNS_QR_SET(sldns_buffer_begin(c->buffer));
|
|
LDNS_TC_SET(sldns_buffer_begin(c->buffer));
|
|
LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
|
|
LDNS_RCODE_SERVFAIL);
|
|
sldns_buffer_set_position(c->buffer, LDNS_HEADER_SIZE);
|
|
sldns_buffer_write_at(c->buffer, 4,
|
|
(uint8_t*)"\0\0\0\0\0\0\0\0", 8);
|
|
sldns_buffer_flip(c->buffer);
|
|
goto send_reply;
|
|
}
|
|
if(worker->stats.extended)
|
|
server_stats_insquery(&worker->stats, c, qinfo.qtype,
|
|
qinfo.qclass, &edns, repinfo);
|
|
if(c->type != comm_udp)
|
|
edns.udp_size = 65535; /* max size for TCP replies */
|
|
if(qinfo.qclass == LDNS_RR_CLASS_CH && answer_chaos(worker, &qinfo,
|
|
&edns, c->buffer)) {
|
|
server_stats_insrcode(&worker->stats, c->buffer);
|
|
goto send_reply;
|
|
}
|
|
if(local_zones_answer(worker->daemon->local_zones, &qinfo, &edns,
|
|
c->buffer, worker->scratchpad, repinfo)) {
|
|
regional_free_all(worker->scratchpad);
|
|
if(sldns_buffer_limit(c->buffer) == 0) {
|
|
comm_point_drop_reply(repinfo);
|
|
return 0;
|
|
}
|
|
server_stats_insrcode(&worker->stats, c->buffer);
|
|
goto send_reply;
|
|
}
|
|
|
|
/* We've looked in our local zones. If the answer isn't there, we
|
|
* might need to bail out based on ACLs now. */
|
|
if((ret=deny_refuse_non_local(c, acl, worker, repinfo)) != -1)
|
|
{
|
|
if(ret == 1)
|
|
goto send_reply;
|
|
return ret;
|
|
}
|
|
|
|
/* If this request does not have the recursion bit set, verify
|
|
* ACLs allow the snooping. */
|
|
if(!(LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) &&
|
|
acl != acl_allow_snoop ) {
|
|
sldns_buffer_set_limit(c->buffer, LDNS_HEADER_SIZE);
|
|
sldns_buffer_write_at(c->buffer, 4,
|
|
(uint8_t*)"\0\0\0\0\0\0\0\0", 8);
|
|
LDNS_QR_SET(sldns_buffer_begin(c->buffer));
|
|
LDNS_RCODE_SET(sldns_buffer_begin(c->buffer),
|
|
LDNS_RCODE_REFUSED);
|
|
sldns_buffer_flip(c->buffer);
|
|
server_stats_insrcode(&worker->stats, c->buffer);
|
|
log_addr(VERB_ALGO, "refused nonrec (cache snoop) query from",
|
|
&repinfo->addr, repinfo->addrlen);
|
|
goto send_reply;
|
|
}
|
|
h = query_info_hash(&qinfo, sldns_buffer_read_u16_at(c->buffer, 2));
|
|
if((e=slabhash_lookup(worker->env.msg_cache, h, &qinfo, 0))) {
|
|
/* answer from cache - we have acquired a readlock on it */
|
|
if(answer_from_cache(worker, &qinfo,
|
|
(struct reply_info*)e->data,
|
|
*(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
|
|
sldns_buffer_read_u16_at(c->buffer, 2), repinfo,
|
|
&edns)) {
|
|
/* prefetch it if the prefetch TTL expired */
|
|
if(worker->env.cfg->prefetch && *worker->env.now >=
|
|
((struct reply_info*)e->data)->prefetch_ttl) {
|
|
time_t leeway = ((struct reply_info*)e->
|
|
data)->ttl - *worker->env.now;
|
|
lock_rw_unlock(&e->lock);
|
|
reply_and_prefetch(worker, &qinfo,
|
|
sldns_buffer_read_u16_at(c->buffer, 2),
|
|
repinfo, leeway);
|
|
rc = 0;
|
|
goto send_reply_rc;
|
|
}
|
|
lock_rw_unlock(&e->lock);
|
|
goto send_reply;
|
|
}
|
|
verbose(VERB_ALGO, "answer from the cache failed");
|
|
lock_rw_unlock(&e->lock);
|
|
}
|
|
if(!LDNS_RD_WIRE(sldns_buffer_begin(c->buffer))) {
|
|
if(answer_norec_from_cache(worker, &qinfo,
|
|
*(uint16_t*)(void *)sldns_buffer_begin(c->buffer),
|
|
sldns_buffer_read_u16_at(c->buffer, 2), repinfo,
|
|
&edns)) {
|
|
goto send_reply;
|
|
}
|
|
verbose(VERB_ALGO, "answer norec from cache -- "
|
|
"need to validate or not primed");
|
|
}
|
|
sldns_buffer_rewind(c->buffer);
|
|
server_stats_querymiss(&worker->stats, worker);
|
|
|
|
if(verbosity >= VERB_CLIENT) {
|
|
if(c->type == comm_udp)
|
|
log_addr(VERB_CLIENT, "udp request from",
|
|
&repinfo->addr, repinfo->addrlen);
|
|
else log_addr(VERB_CLIENT, "tcp request from",
|
|
&repinfo->addr, repinfo->addrlen);
|
|
}
|
|
|
|
/* grab a work request structure for this new request */
|
|
mesh_new_client(worker->env.mesh, &qinfo,
|
|
sldns_buffer_read_u16_at(c->buffer, 2),
|
|
&edns, repinfo, *(uint16_t*)(void *)sldns_buffer_begin(c->buffer));
|
|
worker_mem_report(worker, NULL);
|
|
return 0;
|
|
|
|
send_reply:
|
|
rc = 1;
|
|
send_reply_rc:
|
|
#ifdef USE_DNSTAP
|
|
if(worker->dtenv.log_client_response_messages)
|
|
dt_msg_send_client_response(&worker->dtenv, &repinfo->addr,
|
|
c->type, c->buffer);
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
void
|
|
worker_sighandler(int sig, void* arg)
|
|
{
|
|
/* note that log, print, syscalls here give race conditions.
|
|
* And cause hangups if the log-lock is held by the application. */
|
|
struct worker* worker = (struct worker*)arg;
|
|
switch(sig) {
|
|
#ifdef SIGHUP
|
|
case SIGHUP:
|
|
comm_base_exit(worker->base);
|
|
break;
|
|
#endif
|
|
case SIGINT:
|
|
worker->need_to_exit = 1;
|
|
comm_base_exit(worker->base);
|
|
break;
|
|
#ifdef SIGQUIT
|
|
case SIGQUIT:
|
|
worker->need_to_exit = 1;
|
|
comm_base_exit(worker->base);
|
|
break;
|
|
#endif
|
|
case SIGTERM:
|
|
worker->need_to_exit = 1;
|
|
comm_base_exit(worker->base);
|
|
break;
|
|
default:
|
|
/* unknown signal, ignored */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/** restart statistics timer for worker, if enabled */
|
|
static void
|
|
worker_restart_timer(struct worker* worker)
|
|
{
|
|
if(worker->env.cfg->stat_interval > 0) {
|
|
struct timeval tv;
|
|
#ifndef S_SPLINT_S
|
|
tv.tv_sec = worker->env.cfg->stat_interval;
|
|
tv.tv_usec = 0;
|
|
#endif
|
|
comm_timer_set(worker->stat_timer, &tv);
|
|
}
|
|
}
|
|
|
|
void worker_stat_timer_cb(void* arg)
|
|
{
|
|
struct worker* worker = (struct worker*)arg;
|
|
server_stats_log(&worker->stats, worker, worker->thread_num);
|
|
mesh_stats(worker->env.mesh, "mesh has");
|
|
worker_mem_report(worker, NULL);
|
|
if(!worker->daemon->cfg->stat_cumulative) {
|
|
worker_stats_clear(worker);
|
|
}
|
|
/* start next timer */
|
|
worker_restart_timer(worker);
|
|
}
|
|
|
|
void worker_probe_timer_cb(void* arg)
|
|
{
|
|
struct worker* worker = (struct worker*)arg;
|
|
struct timeval tv;
|
|
#ifndef S_SPLINT_S
|
|
tv.tv_sec = (time_t)autr_probe_timer(&worker->env);
|
|
tv.tv_usec = 0;
|
|
#endif
|
|
if(tv.tv_sec != 0)
|
|
comm_timer_set(worker->env.probe_timer, &tv);
|
|
}
|
|
|
|
struct worker*
|
|
worker_create(struct daemon* daemon, int id, int* ports, int n)
|
|
{
|
|
unsigned int seed;
|
|
struct worker* worker = (struct worker*)calloc(1,
|
|
sizeof(struct worker));
|
|
if(!worker)
|
|
return NULL;
|
|
worker->numports = n;
|
|
worker->ports = (int*)memdup(ports, sizeof(int)*n);
|
|
if(!worker->ports) {
|
|
free(worker);
|
|
return NULL;
|
|
}
|
|
worker->daemon = daemon;
|
|
worker->thread_num = id;
|
|
if(!(worker->cmd = tube_create())) {
|
|
free(worker->ports);
|
|
free(worker);
|
|
return NULL;
|
|
}
|
|
/* create random state here to avoid locking trouble in RAND_bytes */
|
|
seed = (unsigned int)time(NULL) ^ (unsigned int)getpid() ^
|
|
(((unsigned int)worker->thread_num)<<17);
|
|
/* shift thread_num so it does not match out pid bits */
|
|
if(!(worker->rndstate = ub_initstate(seed, daemon->rand))) {
|
|
seed = 0;
|
|
log_err("could not init random numbers.");
|
|
tube_delete(worker->cmd);
|
|
free(worker->ports);
|
|
free(worker);
|
|
return NULL;
|
|
}
|
|
seed = 0;
|
|
#ifdef USE_DNSTAP
|
|
if(daemon->cfg->dnstap) {
|
|
log_assert(daemon->dtenv != NULL);
|
|
memcpy(&worker->dtenv, daemon->dtenv, sizeof(struct dt_env));
|
|
if(!dt_init(&worker->dtenv))
|
|
fatal_exit("dt_init failed");
|
|
}
|
|
#endif
|
|
return worker;
|
|
}
|
|
|
|
int
|
|
worker_init(struct worker* worker, struct config_file *cfg,
|
|
struct listen_port* ports, int do_sigs)
|
|
{
|
|
#ifdef USE_DNSTAP
|
|
struct dt_env* dtenv = &worker->dtenv;
|
|
#else
|
|
void* dtenv = NULL;
|
|
#endif
|
|
worker->need_to_exit = 0;
|
|
worker->base = comm_base_create(do_sigs);
|
|
if(!worker->base) {
|
|
log_err("could not create event handling base");
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
comm_base_set_slow_accept_handlers(worker->base, &worker_stop_accept,
|
|
&worker_start_accept, worker);
|
|
if(do_sigs) {
|
|
#ifdef SIGHUP
|
|
ub_thread_sig_unblock(SIGHUP);
|
|
#endif
|
|
ub_thread_sig_unblock(SIGINT);
|
|
#ifdef SIGQUIT
|
|
ub_thread_sig_unblock(SIGQUIT);
|
|
#endif
|
|
ub_thread_sig_unblock(SIGTERM);
|
|
#ifndef LIBEVENT_SIGNAL_PROBLEM
|
|
worker->comsig = comm_signal_create(worker->base,
|
|
worker_sighandler, worker);
|
|
if(!worker->comsig
|
|
#ifdef SIGHUP
|
|
|| !comm_signal_bind(worker->comsig, SIGHUP)
|
|
#endif
|
|
#ifdef SIGQUIT
|
|
|| !comm_signal_bind(worker->comsig, SIGQUIT)
|
|
#endif
|
|
|| !comm_signal_bind(worker->comsig, SIGTERM)
|
|
|| !comm_signal_bind(worker->comsig, SIGINT)) {
|
|
log_err("could not create signal handlers");
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
#endif /* LIBEVENT_SIGNAL_PROBLEM */
|
|
if(!daemon_remote_open_accept(worker->daemon->rc,
|
|
worker->daemon->rc_ports, worker)) {
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
#ifdef UB_ON_WINDOWS
|
|
wsvc_setup_worker(worker);
|
|
#endif /* UB_ON_WINDOWS */
|
|
} else { /* !do_sigs */
|
|
worker->comsig = NULL;
|
|
}
|
|
worker->front = listen_create(worker->base, ports,
|
|
cfg->msg_buffer_size, (int)cfg->incoming_num_tcp,
|
|
worker->daemon->listen_sslctx, dtenv, worker_handle_request,
|
|
worker);
|
|
if(!worker->front) {
|
|
log_err("could not create listening sockets");
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
worker->back = outside_network_create(worker->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,
|
|
worker->daemon->env->infra_cache, worker->rndstate,
|
|
cfg->use_caps_bits_for_id, worker->ports, worker->numports,
|
|
cfg->unwanted_threshold, &worker_alloc_cleanup, worker,
|
|
cfg->do_udp, worker->daemon->connect_sslctx, cfg->delay_close,
|
|
dtenv);
|
|
if(!worker->back) {
|
|
log_err("could not create outgoing sockets");
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
/* start listening to commands */
|
|
if(!tube_setup_bg_listen(worker->cmd, worker->base,
|
|
&worker_handle_control_cmd, worker)) {
|
|
log_err("could not create control compt.");
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
worker->stat_timer = comm_timer_create(worker->base,
|
|
worker_stat_timer_cb, worker);
|
|
if(!worker->stat_timer) {
|
|
log_err("could not create statistics timer");
|
|
}
|
|
|
|
/* we use the msg_buffer_size as a good estimate for what the
|
|
* user wants for memory usage sizes */
|
|
worker->scratchpad = regional_create_custom(cfg->msg_buffer_size);
|
|
if(!worker->scratchpad) {
|
|
log_err("malloc failure");
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
|
|
server_stats_init(&worker->stats, cfg);
|
|
alloc_init(&worker->alloc, &worker->daemon->superalloc,
|
|
worker->thread_num);
|
|
alloc_set_id_cleanup(&worker->alloc, &worker_alloc_cleanup, worker);
|
|
worker->env = *worker->daemon->env;
|
|
comm_base_timept(worker->base, &worker->env.now, &worker->env.now_tv);
|
|
if(worker->thread_num == 0)
|
|
log_set_time(worker->env.now);
|
|
worker->env.worker = worker;
|
|
worker->env.send_query = &worker_send_query;
|
|
worker->env.alloc = &worker->alloc;
|
|
worker->env.rnd = worker->rndstate;
|
|
worker->env.scratch = worker->scratchpad;
|
|
worker->env.mesh = mesh_create(&worker->daemon->mods, &worker->env);
|
|
worker->env.detach_subs = &mesh_detach_subs;
|
|
worker->env.attach_sub = &mesh_attach_sub;
|
|
worker->env.kill_sub = &mesh_state_delete;
|
|
worker->env.detect_cycle = &mesh_detect_cycle;
|
|
worker->env.scratch_buffer = sldns_buffer_new(cfg->msg_buffer_size);
|
|
if(!(worker->env.fwds = forwards_create()) ||
|
|
!forwards_apply_cfg(worker->env.fwds, cfg)) {
|
|
log_err("Could not set forward zones");
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
if(!(worker->env.hints = hints_create()) ||
|
|
!hints_apply_cfg(worker->env.hints, cfg)) {
|
|
log_err("Could not set root or stub hints");
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
/* one probe timer per process -- if we have 5011 anchors */
|
|
if(autr_get_num_anchors(worker->env.anchors) > 0
|
|
#ifndef THREADS_DISABLED
|
|
&& worker->thread_num == 0
|
|
#endif
|
|
) {
|
|
struct timeval tv;
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 0;
|
|
worker->env.probe_timer = comm_timer_create(worker->base,
|
|
worker_probe_timer_cb, worker);
|
|
if(!worker->env.probe_timer) {
|
|
log_err("could not create 5011-probe timer");
|
|
} else {
|
|
/* let timer fire, then it can reset itself */
|
|
comm_timer_set(worker->env.probe_timer, &tv);
|
|
}
|
|
}
|
|
if(!worker->env.mesh || !worker->env.scratch_buffer) {
|
|
worker_delete(worker);
|
|
return 0;
|
|
}
|
|
worker_mem_report(worker, NULL);
|
|
/* if statistics enabled start timer */
|
|
if(worker->env.cfg->stat_interval > 0) {
|
|
verbose(VERB_ALGO, "set statistics interval %d secs",
|
|
worker->env.cfg->stat_interval);
|
|
worker_restart_timer(worker);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
worker_work(struct worker* worker)
|
|
{
|
|
comm_base_dispatch(worker->base);
|
|
}
|
|
|
|
void
|
|
worker_delete(struct worker* worker)
|
|
{
|
|
if(!worker)
|
|
return;
|
|
if(worker->env.mesh && verbosity >= VERB_OPS) {
|
|
server_stats_log(&worker->stats, worker, worker->thread_num);
|
|
mesh_stats(worker->env.mesh, "mesh has");
|
|
worker_mem_report(worker, NULL);
|
|
}
|
|
outside_network_quit_prepare(worker->back);
|
|
mesh_delete(worker->env.mesh);
|
|
sldns_buffer_free(worker->env.scratch_buffer);
|
|
forwards_delete(worker->env.fwds);
|
|
hints_delete(worker->env.hints);
|
|
listen_delete(worker->front);
|
|
outside_network_delete(worker->back);
|
|
comm_signal_delete(worker->comsig);
|
|
tube_delete(worker->cmd);
|
|
comm_timer_delete(worker->stat_timer);
|
|
comm_timer_delete(worker->env.probe_timer);
|
|
free(worker->ports);
|
|
if(worker->thread_num == 0) {
|
|
log_set_time(NULL);
|
|
#ifdef UB_ON_WINDOWS
|
|
wsvc_desetup_worker(worker);
|
|
#endif /* UB_ON_WINDOWS */
|
|
}
|
|
comm_base_delete(worker->base);
|
|
ub_randfree(worker->rndstate);
|
|
alloc_clear(&worker->alloc);
|
|
regional_destroy(worker->scratchpad);
|
|
free(worker);
|
|
}
|
|
|
|
struct outbound_entry*
|
|
worker_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 worker* worker = 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(worker->back, qname,
|
|
qnamelen, qtype, qclass, flags, dnssec, want_dnssec, nocaps,
|
|
q->env->cfg->tcp_upstream, q->env->cfg->ssl_upstream, addr,
|
|
addrlen, zone, zonelen, worker_handle_service_reply, e,
|
|
worker->back->udp_buff);
|
|
if(!e->qsent) {
|
|
return NULL;
|
|
}
|
|
return e;
|
|
}
|
|
|
|
void
|
|
worker_alloc_cleanup(void* arg)
|
|
{
|
|
struct worker* worker = (struct worker*)arg;
|
|
slabhash_clear(&worker->env.rrset_cache->table);
|
|
slabhash_clear(worker->env.msg_cache);
|
|
}
|
|
|
|
void worker_stats_clear(struct worker* worker)
|
|
{
|
|
server_stats_init(&worker->stats, worker->env.cfg);
|
|
mesh_stats_clear(worker->env.mesh);
|
|
worker->back->unwanted_replies = 0;
|
|
worker->back->num_tcp_outgoing = 0;
|
|
}
|
|
|
|
void worker_start_accept(void* arg)
|
|
{
|
|
struct worker* worker = (struct worker*)arg;
|
|
listen_start_accept(worker->front);
|
|
if(worker->thread_num == 0)
|
|
daemon_remote_start_accept(worker->daemon->rc);
|
|
}
|
|
|
|
void worker_stop_accept(void* arg)
|
|
{
|
|
struct worker* worker = (struct worker*)arg;
|
|
listen_stop_accept(worker->front);
|
|
if(worker->thread_num == 0)
|
|
daemon_remote_stop_accept(worker->daemon->rc);
|
|
}
|
|
|
|
/* --- fake callbacks for fptr_wlist to work --- */
|
|
struct outbound_entry* libworker_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;
|
|
}
|
|
|
|
int libworker_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 libworker_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;
|
|
}
|
|
|
|
void libworker_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);
|
|
}
|
|
|
|
void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
|
|
sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
|
|
char* ATTR_UNUSED(why_bogus))
|
|
{
|
|
log_assert(0);
|
|
}
|
|
|
|
void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
|
|
sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
|
|
char* ATTR_UNUSED(why_bogus))
|
|
{
|
|
log_assert(0);
|
|
}
|
|
|
|
void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
|
|
sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
|
|
char* ATTR_UNUSED(why_bogus))
|
|
{
|
|
log_assert(0);
|
|
}
|
|
|
|
int context_query_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
|
|
{
|
|
log_assert(0);
|
|
return 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;
|
|
}
|
|
|