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https://git.wownero.com/wownero/wownero.git
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2053 lines
59 KiB
C
2053 lines
59 KiB
C
/*
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* services/outside_network.c - implement sending of queries and wait answer.
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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 has functions to send queries to authoritative servers and
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* wait for the pending answer events.
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*/
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#include "config.h"
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#include <ctype.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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#include <sys/time.h>
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#include "services/outside_network.h"
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#include "services/listen_dnsport.h"
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#include "services/cache/infra.h"
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#include "util/data/msgparse.h"
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#include "util/data/msgreply.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/netevent.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 "util/fptr_wlist.h"
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#include "sldns/sbuffer.h"
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#include "dnstap/dnstap.h"
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#ifdef HAVE_OPENSSL_SSL_H
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#include <openssl/ssl.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 <fcntl.h>
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/** number of times to retry making a random ID that is unique. */
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#define MAX_ID_RETRY 1000
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/** number of times to retry finding interface, port that can be opened. */
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#define MAX_PORT_RETRY 10000
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/** number of retries on outgoing UDP queries */
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#define OUTBOUND_UDP_RETRY 1
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/** initiate TCP transaction for serviced query */
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static void serviced_tcp_initiate(struct serviced_query* sq, sldns_buffer* buff);
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/** with a fd available, randomize and send UDP */
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static int randomize_and_send_udp(struct pending* pend, sldns_buffer* packet,
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int timeout);
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/** remove waiting tcp from the outnet waiting list */
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static void waiting_list_remove(struct outside_network* outnet,
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struct waiting_tcp* w);
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int
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pending_cmp(const void* key1, const void* key2)
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{
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struct pending *p1 = (struct pending*)key1;
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struct pending *p2 = (struct pending*)key2;
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if(p1->id < p2->id)
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return -1;
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if(p1->id > p2->id)
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return 1;
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log_assert(p1->id == p2->id);
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return sockaddr_cmp(&p1->addr, p1->addrlen, &p2->addr, p2->addrlen);
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}
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int
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serviced_cmp(const void* key1, const void* key2)
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{
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struct serviced_query* q1 = (struct serviced_query*)key1;
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struct serviced_query* q2 = (struct serviced_query*)key2;
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int r;
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if(q1->qbuflen < q2->qbuflen)
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return -1;
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if(q1->qbuflen > q2->qbuflen)
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return 1;
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log_assert(q1->qbuflen == q2->qbuflen);
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log_assert(q1->qbuflen >= 15 /* 10 header, root, type, class */);
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/* alternate casing of qname is still the same query */
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if((r = memcmp(q1->qbuf, q2->qbuf, 10)) != 0)
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return r;
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if((r = memcmp(q1->qbuf+q1->qbuflen-4, q2->qbuf+q2->qbuflen-4, 4)) != 0)
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return r;
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if(q1->dnssec != q2->dnssec) {
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if(q1->dnssec < q2->dnssec)
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return -1;
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return 1;
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}
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if((r = query_dname_compare(q1->qbuf+10, q2->qbuf+10)) != 0)
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return r;
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return sockaddr_cmp(&q1->addr, q1->addrlen, &q2->addr, q2->addrlen);
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}
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/** delete waiting_tcp entry. Does not unlink from waiting list.
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* @param w: to delete.
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*/
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static void
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waiting_tcp_delete(struct waiting_tcp* w)
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{
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if(!w) return;
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if(w->timer)
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comm_timer_delete(w->timer);
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free(w);
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}
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/**
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* Pick random outgoing-interface of that family, and bind it.
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* port set to 0 so OS picks a port number for us.
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* if it is the ANY address, do not bind.
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* @param w: tcp structure with destination address.
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* @param s: socket fd.
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* @return false on error, socket closed.
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*/
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static int
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pick_outgoing_tcp(struct waiting_tcp* w, int s)
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{
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struct port_if* pi = NULL;
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int num;
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#ifdef INET6
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if(addr_is_ip6(&w->addr, w->addrlen))
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num = w->outnet->num_ip6;
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else
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#endif
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num = w->outnet->num_ip4;
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if(num == 0) {
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log_err("no TCP outgoing interfaces of family");
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log_addr(VERB_OPS, "for addr", &w->addr, w->addrlen);
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#ifndef USE_WINSOCK
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close(s);
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#else
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closesocket(s);
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#endif
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return 0;
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}
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#ifdef INET6
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if(addr_is_ip6(&w->addr, w->addrlen))
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pi = &w->outnet->ip6_ifs[ub_random_max(w->outnet->rnd, num)];
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else
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#endif
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pi = &w->outnet->ip4_ifs[ub_random_max(w->outnet->rnd, num)];
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log_assert(pi);
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if(addr_is_any(&pi->addr, pi->addrlen)) {
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/* binding to the ANY interface is for listening sockets */
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return 1;
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}
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/* set port to 0 */
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if(addr_is_ip6(&pi->addr, pi->addrlen))
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((struct sockaddr_in6*)&pi->addr)->sin6_port = 0;
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else ((struct sockaddr_in*)&pi->addr)->sin_port = 0;
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if(bind(s, (struct sockaddr*)&pi->addr, pi->addrlen) != 0) {
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#ifndef USE_WINSOCK
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log_err("outgoing tcp: bind: %s", strerror(errno));
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close(s);
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#else
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log_err("outgoing tcp: bind: %s",
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wsa_strerror(WSAGetLastError()));
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closesocket(s);
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#endif
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return 0;
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}
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log_addr(VERB_ALGO, "tcp bound to src", &pi->addr, pi->addrlen);
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return 1;
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}
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/** use next free buffer to service a tcp query */
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static int
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outnet_tcp_take_into_use(struct waiting_tcp* w, uint8_t* pkt, size_t pkt_len)
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{
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struct pending_tcp* pend = w->outnet->tcp_free;
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int s;
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log_assert(pend);
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log_assert(pkt);
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log_assert(w->addrlen > 0);
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/* open socket */
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#ifdef INET6
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if(addr_is_ip6(&w->addr, w->addrlen))
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s = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP);
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else
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#endif
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s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
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if(s == -1) {
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#ifndef USE_WINSOCK
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log_err_addr("outgoing tcp: socket", strerror(errno),
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&w->addr, w->addrlen);
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#else
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log_err_addr("outgoing tcp: socket",
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wsa_strerror(WSAGetLastError()), &w->addr, w->addrlen);
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#endif
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return 0;
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}
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if(!pick_outgoing_tcp(w, s))
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return 0;
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fd_set_nonblock(s);
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if(connect(s, (struct sockaddr*)&w->addr, w->addrlen) == -1) {
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#ifndef USE_WINSOCK
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#ifdef EINPROGRESS
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if(errno != EINPROGRESS) {
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#else
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if(1) {
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#endif
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if(tcp_connect_errno_needs_log(
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(struct sockaddr*)&w->addr, w->addrlen))
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log_err_addr("outgoing tcp: connect",
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strerror(errno), &w->addr, w->addrlen);
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close(s);
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#else /* USE_WINSOCK */
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if(WSAGetLastError() != WSAEINPROGRESS &&
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WSAGetLastError() != WSAEWOULDBLOCK) {
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closesocket(s);
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#endif
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return 0;
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}
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}
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if(w->outnet->sslctx && w->ssl_upstream) {
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pend->c->ssl = outgoing_ssl_fd(w->outnet->sslctx, s);
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if(!pend->c->ssl) {
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pend->c->fd = s;
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comm_point_close(pend->c);
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return 0;
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}
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#ifdef USE_WINSOCK
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comm_point_tcp_win_bio_cb(pend->c, pend->c->ssl);
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#endif
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pend->c->ssl_shake_state = comm_ssl_shake_write;
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}
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w->pkt = NULL;
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w->next_waiting = (void*)pend;
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pend->id = LDNS_ID_WIRE(pkt);
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w->outnet->num_tcp_outgoing++;
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w->outnet->tcp_free = pend->next_free;
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pend->next_free = NULL;
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pend->query = w;
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pend->c->repinfo.addrlen = w->addrlen;
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memcpy(&pend->c->repinfo.addr, &w->addr, w->addrlen);
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sldns_buffer_clear(pend->c->buffer);
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sldns_buffer_write(pend->c->buffer, pkt, pkt_len);
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sldns_buffer_flip(pend->c->buffer);
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pend->c->tcp_is_reading = 0;
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pend->c->tcp_byte_count = 0;
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comm_point_start_listening(pend->c, s, -1);
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return 1;
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}
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/** see if buffers can be used to service TCP queries */
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static void
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use_free_buffer(struct outside_network* outnet)
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{
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struct waiting_tcp* w;
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while(outnet->tcp_free && outnet->tcp_wait_first
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&& !outnet->want_to_quit) {
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w = outnet->tcp_wait_first;
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outnet->tcp_wait_first = w->next_waiting;
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if(outnet->tcp_wait_last == w)
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outnet->tcp_wait_last = NULL;
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if(!outnet_tcp_take_into_use(w, w->pkt, w->pkt_len)) {
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comm_point_callback_t* cb = w->cb;
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void* cb_arg = w->cb_arg;
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waiting_tcp_delete(w);
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fptr_ok(fptr_whitelist_pending_tcp(cb));
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(void)(*cb)(NULL, cb_arg, NETEVENT_CLOSED, NULL);
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}
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}
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}
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/** decomission a tcp buffer, closes commpoint and frees waiting_tcp entry */
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static void
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decomission_pending_tcp(struct outside_network* outnet,
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struct pending_tcp* pend)
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{
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if(pend->c->ssl) {
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#ifdef HAVE_SSL
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SSL_shutdown(pend->c->ssl);
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SSL_free(pend->c->ssl);
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pend->c->ssl = NULL;
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#endif
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}
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comm_point_close(pend->c);
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pend->next_free = outnet->tcp_free;
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outnet->tcp_free = pend;
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waiting_tcp_delete(pend->query);
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pend->query = NULL;
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use_free_buffer(outnet);
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}
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int
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outnet_tcp_cb(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 pending_tcp* pend = (struct pending_tcp*)arg;
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struct outside_network* outnet = pend->query->outnet;
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verbose(VERB_ALGO, "outnettcp cb");
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if(error != NETEVENT_NOERROR) {
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verbose(VERB_QUERY, "outnettcp got tcp error %d", error);
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/* pass error below and exit */
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} else {
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/* check ID */
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if(sldns_buffer_limit(c->buffer) < sizeof(uint16_t) ||
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LDNS_ID_WIRE(sldns_buffer_begin(c->buffer))!=pend->id) {
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log_addr(VERB_QUERY,
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"outnettcp: bad ID in reply, from:",
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&pend->query->addr, pend->query->addrlen);
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error = NETEVENT_CLOSED;
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}
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}
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fptr_ok(fptr_whitelist_pending_tcp(pend->query->cb));
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(void)(*pend->query->cb)(c, pend->query->cb_arg, error, reply_info);
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decomission_pending_tcp(outnet, pend);
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return 0;
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}
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/** lower use count on pc, see if it can be closed */
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static void
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portcomm_loweruse(struct outside_network* outnet, struct port_comm* pc)
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{
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struct port_if* pif;
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pc->num_outstanding--;
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if(pc->num_outstanding > 0) {
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return;
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}
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/* close it and replace in unused list */
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verbose(VERB_ALGO, "close of port %d", pc->number);
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comm_point_close(pc->cp);
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pif = pc->pif;
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log_assert(pif->inuse > 0);
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pif->avail_ports[pif->avail_total - pif->inuse] = pc->number;
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pif->inuse--;
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pif->out[pc->index] = pif->out[pif->inuse];
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pif->out[pc->index]->index = pc->index;
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pc->next = outnet->unused_fds;
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outnet->unused_fds = pc;
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}
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/** try to send waiting UDP queries */
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static void
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outnet_send_wait_udp(struct outside_network* outnet)
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{
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struct pending* pend;
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/* process waiting queries */
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while(outnet->udp_wait_first && outnet->unused_fds
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&& !outnet->want_to_quit) {
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pend = outnet->udp_wait_first;
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outnet->udp_wait_first = pend->next_waiting;
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if(!pend->next_waiting) outnet->udp_wait_last = NULL;
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sldns_buffer_clear(outnet->udp_buff);
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sldns_buffer_write(outnet->udp_buff, pend->pkt, pend->pkt_len);
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sldns_buffer_flip(outnet->udp_buff);
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free(pend->pkt); /* freeing now makes get_mem correct */
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pend->pkt = NULL;
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pend->pkt_len = 0;
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if(!randomize_and_send_udp(pend, outnet->udp_buff,
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pend->timeout)) {
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/* callback error on pending */
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if(pend->cb) {
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fptr_ok(fptr_whitelist_pending_udp(pend->cb));
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(void)(*pend->cb)(outnet->unused_fds->cp, pend->cb_arg,
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NETEVENT_CLOSED, NULL);
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}
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pending_delete(outnet, pend);
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}
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}
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}
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int
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outnet_udp_cb(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 outside_network* outnet = (struct outside_network*)arg;
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struct pending key;
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struct pending* p;
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verbose(VERB_ALGO, "answer cb");
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if(error != NETEVENT_NOERROR) {
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verbose(VERB_QUERY, "outnetudp got udp error %d", error);
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return 0;
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}
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if(sldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) {
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verbose(VERB_QUERY, "outnetudp udp too short");
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return 0;
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}
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log_assert(reply_info);
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/* setup lookup key */
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key.id = (unsigned)LDNS_ID_WIRE(sldns_buffer_begin(c->buffer));
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memcpy(&key.addr, &reply_info->addr, reply_info->addrlen);
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key.addrlen = reply_info->addrlen;
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verbose(VERB_ALGO, "Incoming reply id = %4.4x", key.id);
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log_addr(VERB_ALGO, "Incoming reply addr =",
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&reply_info->addr, reply_info->addrlen);
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/* find it, see if this thing is a valid query response */
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verbose(VERB_ALGO, "lookup size is %d entries", (int)outnet->pending->count);
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p = (struct pending*)rbtree_search(outnet->pending, &key);
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if(!p) {
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verbose(VERB_QUERY, "received unwanted or unsolicited udp reply dropped.");
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log_buf(VERB_ALGO, "dropped message", c->buffer);
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outnet->unwanted_replies++;
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if(outnet->unwanted_threshold && ++outnet->unwanted_total
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>= outnet->unwanted_threshold) {
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log_warn("unwanted reply total reached threshold (%u)"
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" you may be under attack."
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" defensive action: clearing the cache",
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(unsigned)outnet->unwanted_threshold);
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fptr_ok(fptr_whitelist_alloc_cleanup(
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outnet->unwanted_action));
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(*outnet->unwanted_action)(outnet->unwanted_param);
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outnet->unwanted_total = 0;
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}
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return 0;
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}
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verbose(VERB_ALGO, "received udp reply.");
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log_buf(VERB_ALGO, "udp message", c->buffer);
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if(p->pc->cp != c) {
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verbose(VERB_QUERY, "received reply id,addr on wrong port. "
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"dropped.");
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outnet->unwanted_replies++;
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if(outnet->unwanted_threshold && ++outnet->unwanted_total
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>= outnet->unwanted_threshold) {
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log_warn("unwanted reply total reached threshold (%u)"
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" you may be under attack."
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|
" defensive action: clearing the cache",
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(unsigned)outnet->unwanted_threshold);
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|
fptr_ok(fptr_whitelist_alloc_cleanup(
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|
outnet->unwanted_action));
|
|
(*outnet->unwanted_action)(outnet->unwanted_param);
|
|
outnet->unwanted_total = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
comm_timer_disable(p->timer);
|
|
verbose(VERB_ALGO, "outnet handle udp reply");
|
|
/* delete from tree first in case callback creates a retry */
|
|
(void)rbtree_delete(outnet->pending, p->node.key);
|
|
if(p->cb) {
|
|
fptr_ok(fptr_whitelist_pending_udp(p->cb));
|
|
(void)(*p->cb)(p->pc->cp, p->cb_arg, NETEVENT_NOERROR, reply_info);
|
|
}
|
|
portcomm_loweruse(outnet, p->pc);
|
|
pending_delete(NULL, p);
|
|
outnet_send_wait_udp(outnet);
|
|
return 0;
|
|
}
|
|
|
|
/** calculate number of ip4 and ip6 interfaces*/
|
|
static void
|
|
calc_num46(char** ifs, int num_ifs, int do_ip4, int do_ip6,
|
|
int* num_ip4, int* num_ip6)
|
|
{
|
|
int i;
|
|
*num_ip4 = 0;
|
|
*num_ip6 = 0;
|
|
if(num_ifs <= 0) {
|
|
if(do_ip4)
|
|
*num_ip4 = 1;
|
|
if(do_ip6)
|
|
*num_ip6 = 1;
|
|
return;
|
|
}
|
|
for(i=0; i<num_ifs; i++)
|
|
{
|
|
if(str_is_ip6(ifs[i])) {
|
|
if(do_ip6)
|
|
(*num_ip6)++;
|
|
} else {
|
|
if(do_ip4)
|
|
(*num_ip4)++;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void
|
|
pending_udp_timer_delay_cb(void* arg)
|
|
{
|
|
struct pending* p = (struct pending*)arg;
|
|
struct outside_network* outnet = p->outnet;
|
|
verbose(VERB_ALGO, "timeout udp with delay");
|
|
portcomm_loweruse(outnet, p->pc);
|
|
pending_delete(outnet, p);
|
|
outnet_send_wait_udp(outnet);
|
|
}
|
|
|
|
void
|
|
pending_udp_timer_cb(void *arg)
|
|
{
|
|
struct pending* p = (struct pending*)arg;
|
|
struct outside_network* outnet = p->outnet;
|
|
/* it timed out */
|
|
verbose(VERB_ALGO, "timeout udp");
|
|
if(p->cb) {
|
|
fptr_ok(fptr_whitelist_pending_udp(p->cb));
|
|
(void)(*p->cb)(p->pc->cp, p->cb_arg, NETEVENT_TIMEOUT, NULL);
|
|
}
|
|
/* if delayclose, keep port open for a longer time.
|
|
* But if the udpwaitlist exists, then we are struggling to
|
|
* keep up with demand for sockets, so do not wait, but service
|
|
* the customer (customer service more important than portICMPs) */
|
|
if(outnet->delayclose && !outnet->udp_wait_first) {
|
|
p->cb = NULL;
|
|
p->timer->callback = &pending_udp_timer_delay_cb;
|
|
comm_timer_set(p->timer, &outnet->delay_tv);
|
|
return;
|
|
}
|
|
portcomm_loweruse(outnet, p->pc);
|
|
pending_delete(outnet, p);
|
|
outnet_send_wait_udp(outnet);
|
|
}
|
|
|
|
/** create pending_tcp buffers */
|
|
static int
|
|
create_pending_tcp(struct outside_network* outnet, size_t bufsize)
|
|
{
|
|
size_t i;
|
|
if(outnet->num_tcp == 0)
|
|
return 1; /* no tcp needed, nothing to do */
|
|
if(!(outnet->tcp_conns = (struct pending_tcp **)calloc(
|
|
outnet->num_tcp, sizeof(struct pending_tcp*))))
|
|
return 0;
|
|
for(i=0; i<outnet->num_tcp; i++) {
|
|
if(!(outnet->tcp_conns[i] = (struct pending_tcp*)calloc(1,
|
|
sizeof(struct pending_tcp))))
|
|
return 0;
|
|
outnet->tcp_conns[i]->next_free = outnet->tcp_free;
|
|
outnet->tcp_free = outnet->tcp_conns[i];
|
|
outnet->tcp_conns[i]->c = comm_point_create_tcp_out(
|
|
outnet->base, bufsize, outnet_tcp_cb,
|
|
outnet->tcp_conns[i]);
|
|
if(!outnet->tcp_conns[i]->c)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/** setup an outgoing interface, ready address */
|
|
static int setup_if(struct port_if* pif, const char* addrstr,
|
|
int* avail, int numavail, size_t numfd)
|
|
{
|
|
pif->avail_total = numavail;
|
|
pif->avail_ports = (int*)memdup(avail, (size_t)numavail*sizeof(int));
|
|
if(!pif->avail_ports)
|
|
return 0;
|
|
if(!ipstrtoaddr(addrstr, UNBOUND_DNS_PORT, &pif->addr, &pif->addrlen))
|
|
return 0;
|
|
pif->maxout = (int)numfd;
|
|
pif->inuse = 0;
|
|
pif->out = (struct port_comm**)calloc(numfd,
|
|
sizeof(struct port_comm*));
|
|
if(!pif->out)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
struct outside_network*
|
|
outside_network_create(struct comm_base *base, size_t bufsize,
|
|
size_t num_ports, char** ifs, int num_ifs, int do_ip4,
|
|
int do_ip6, size_t num_tcp, struct infra_cache* infra,
|
|
struct ub_randstate* rnd, int use_caps_for_id, int* availports,
|
|
int numavailports, size_t unwanted_threshold,
|
|
void (*unwanted_action)(void*), void* unwanted_param, int do_udp,
|
|
void* sslctx, int delayclose, struct dt_env* dtenv)
|
|
{
|
|
struct outside_network* outnet = (struct outside_network*)
|
|
calloc(1, sizeof(struct outside_network));
|
|
size_t k;
|
|
if(!outnet) {
|
|
log_err("malloc failed");
|
|
return NULL;
|
|
}
|
|
comm_base_timept(base, &outnet->now_secs, &outnet->now_tv);
|
|
outnet->base = base;
|
|
outnet->num_tcp = num_tcp;
|
|
outnet->num_tcp_outgoing = 0;
|
|
outnet->infra = infra;
|
|
outnet->rnd = rnd;
|
|
outnet->sslctx = sslctx;
|
|
#ifdef USE_DNSTAP
|
|
outnet->dtenv = dtenv;
|
|
#else
|
|
(void)dtenv;
|
|
#endif
|
|
outnet->svcd_overhead = 0;
|
|
outnet->want_to_quit = 0;
|
|
outnet->unwanted_threshold = unwanted_threshold;
|
|
outnet->unwanted_action = unwanted_action;
|
|
outnet->unwanted_param = unwanted_param;
|
|
outnet->use_caps_for_id = use_caps_for_id;
|
|
outnet->do_udp = do_udp;
|
|
#ifndef S_SPLINT_S
|
|
if(delayclose) {
|
|
outnet->delayclose = 1;
|
|
outnet->delay_tv.tv_sec = delayclose/1000;
|
|
outnet->delay_tv.tv_usec = (delayclose%1000)*1000;
|
|
}
|
|
#endif
|
|
if(numavailports == 0) {
|
|
log_err("no outgoing ports available");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
#ifndef INET6
|
|
do_ip6 = 0;
|
|
#endif
|
|
calc_num46(ifs, num_ifs, do_ip4, do_ip6,
|
|
&outnet->num_ip4, &outnet->num_ip6);
|
|
if(outnet->num_ip4 != 0) {
|
|
if(!(outnet->ip4_ifs = (struct port_if*)calloc(
|
|
(size_t)outnet->num_ip4, sizeof(struct port_if)))) {
|
|
log_err("malloc failed");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
}
|
|
if(outnet->num_ip6 != 0) {
|
|
if(!(outnet->ip6_ifs = (struct port_if*)calloc(
|
|
(size_t)outnet->num_ip6, sizeof(struct port_if)))) {
|
|
log_err("malloc failed");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
}
|
|
if( !(outnet->udp_buff = sldns_buffer_new(bufsize)) ||
|
|
!(outnet->pending = rbtree_create(pending_cmp)) ||
|
|
!(outnet->serviced = rbtree_create(serviced_cmp)) ||
|
|
!create_pending_tcp(outnet, bufsize)) {
|
|
log_err("malloc failed");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
|
|
/* allocate commpoints */
|
|
for(k=0; k<num_ports; k++) {
|
|
struct port_comm* pc;
|
|
pc = (struct port_comm*)calloc(1, sizeof(*pc));
|
|
if(!pc) {
|
|
log_err("malloc failed");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
pc->cp = comm_point_create_udp(outnet->base, -1,
|
|
outnet->udp_buff, outnet_udp_cb, outnet);
|
|
if(!pc->cp) {
|
|
log_err("malloc failed");
|
|
free(pc);
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
pc->next = outnet->unused_fds;
|
|
outnet->unused_fds = pc;
|
|
}
|
|
|
|
/* allocate interfaces */
|
|
if(num_ifs == 0) {
|
|
if(do_ip4 && !setup_if(&outnet->ip4_ifs[0], "0.0.0.0",
|
|
availports, numavailports, num_ports)) {
|
|
log_err("malloc failed");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
if(do_ip6 && !setup_if(&outnet->ip6_ifs[0], "::",
|
|
availports, numavailports, num_ports)) {
|
|
log_err("malloc failed");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
} else {
|
|
size_t done_4 = 0, done_6 = 0;
|
|
int i;
|
|
for(i=0; i<num_ifs; i++) {
|
|
if(str_is_ip6(ifs[i]) && do_ip6) {
|
|
if(!setup_if(&outnet->ip6_ifs[done_6], ifs[i],
|
|
availports, numavailports, num_ports)){
|
|
log_err("malloc failed");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
done_6++;
|
|
}
|
|
if(!str_is_ip6(ifs[i]) && do_ip4) {
|
|
if(!setup_if(&outnet->ip4_ifs[done_4], ifs[i],
|
|
availports, numavailports, num_ports)){
|
|
log_err("malloc failed");
|
|
outside_network_delete(outnet);
|
|
return NULL;
|
|
}
|
|
done_4++;
|
|
}
|
|
}
|
|
}
|
|
return outnet;
|
|
}
|
|
|
|
/** helper pending delete */
|
|
static void
|
|
pending_node_del(rbnode_t* node, void* arg)
|
|
{
|
|
struct pending* pend = (struct pending*)node;
|
|
struct outside_network* outnet = (struct outside_network*)arg;
|
|
pending_delete(outnet, pend);
|
|
}
|
|
|
|
/** helper serviced delete */
|
|
static void
|
|
serviced_node_del(rbnode_t* node, void* ATTR_UNUSED(arg))
|
|
{
|
|
struct serviced_query* sq = (struct serviced_query*)node;
|
|
struct service_callback* p = sq->cblist, *np;
|
|
free(sq->qbuf);
|
|
free(sq->zone);
|
|
while(p) {
|
|
np = p->next;
|
|
free(p);
|
|
p = np;
|
|
}
|
|
free(sq);
|
|
}
|
|
|
|
void
|
|
outside_network_quit_prepare(struct outside_network* outnet)
|
|
{
|
|
if(!outnet)
|
|
return;
|
|
/* prevent queued items from being sent */
|
|
outnet->want_to_quit = 1;
|
|
}
|
|
|
|
void
|
|
outside_network_delete(struct outside_network* outnet)
|
|
{
|
|
if(!outnet)
|
|
return;
|
|
outnet->want_to_quit = 1;
|
|
/* check every element, since we can be called on malloc error */
|
|
if(outnet->pending) {
|
|
/* free pending elements, but do no unlink from tree. */
|
|
traverse_postorder(outnet->pending, pending_node_del, NULL);
|
|
free(outnet->pending);
|
|
}
|
|
if(outnet->serviced) {
|
|
traverse_postorder(outnet->serviced, serviced_node_del, NULL);
|
|
free(outnet->serviced);
|
|
}
|
|
if(outnet->udp_buff)
|
|
sldns_buffer_free(outnet->udp_buff);
|
|
if(outnet->unused_fds) {
|
|
struct port_comm* p = outnet->unused_fds, *np;
|
|
while(p) {
|
|
np = p->next;
|
|
comm_point_delete(p->cp);
|
|
free(p);
|
|
p = np;
|
|
}
|
|
outnet->unused_fds = NULL;
|
|
}
|
|
if(outnet->ip4_ifs) {
|
|
int i, k;
|
|
for(i=0; i<outnet->num_ip4; i++) {
|
|
for(k=0; k<outnet->ip4_ifs[i].inuse; k++) {
|
|
struct port_comm* pc = outnet->ip4_ifs[i].
|
|
out[k];
|
|
comm_point_delete(pc->cp);
|
|
free(pc);
|
|
}
|
|
free(outnet->ip4_ifs[i].avail_ports);
|
|
free(outnet->ip4_ifs[i].out);
|
|
}
|
|
free(outnet->ip4_ifs);
|
|
}
|
|
if(outnet->ip6_ifs) {
|
|
int i, k;
|
|
for(i=0; i<outnet->num_ip6; i++) {
|
|
for(k=0; k<outnet->ip6_ifs[i].inuse; k++) {
|
|
struct port_comm* pc = outnet->ip6_ifs[i].
|
|
out[k];
|
|
comm_point_delete(pc->cp);
|
|
free(pc);
|
|
}
|
|
free(outnet->ip6_ifs[i].avail_ports);
|
|
free(outnet->ip6_ifs[i].out);
|
|
}
|
|
free(outnet->ip6_ifs);
|
|
}
|
|
if(outnet->tcp_conns) {
|
|
size_t i;
|
|
for(i=0; i<outnet->num_tcp; i++)
|
|
if(outnet->tcp_conns[i]) {
|
|
comm_point_delete(outnet->tcp_conns[i]->c);
|
|
waiting_tcp_delete(outnet->tcp_conns[i]->query);
|
|
free(outnet->tcp_conns[i]);
|
|
}
|
|
free(outnet->tcp_conns);
|
|
}
|
|
if(outnet->tcp_wait_first) {
|
|
struct waiting_tcp* p = outnet->tcp_wait_first, *np;
|
|
while(p) {
|
|
np = p->next_waiting;
|
|
waiting_tcp_delete(p);
|
|
p = np;
|
|
}
|
|
}
|
|
if(outnet->udp_wait_first) {
|
|
struct pending* p = outnet->udp_wait_first, *np;
|
|
while(p) {
|
|
np = p->next_waiting;
|
|
pending_delete(NULL, p);
|
|
p = np;
|
|
}
|
|
}
|
|
free(outnet);
|
|
}
|
|
|
|
void
|
|
pending_delete(struct outside_network* outnet, struct pending* p)
|
|
{
|
|
if(!p)
|
|
return;
|
|
if(outnet && outnet->udp_wait_first &&
|
|
(p->next_waiting || p == outnet->udp_wait_last) ) {
|
|
/* delete from waiting list, if it is in the waiting list */
|
|
struct pending* prev = NULL, *x = outnet->udp_wait_first;
|
|
while(x && x != p) {
|
|
prev = x;
|
|
x = x->next_waiting;
|
|
}
|
|
if(x) {
|
|
log_assert(x == p);
|
|
if(prev)
|
|
prev->next_waiting = p->next_waiting;
|
|
else outnet->udp_wait_first = p->next_waiting;
|
|
if(outnet->udp_wait_last == p)
|
|
outnet->udp_wait_last = prev;
|
|
}
|
|
}
|
|
if(outnet) {
|
|
(void)rbtree_delete(outnet->pending, p->node.key);
|
|
}
|
|
if(p->timer)
|
|
comm_timer_delete(p->timer);
|
|
free(p->pkt);
|
|
free(p);
|
|
}
|
|
|
|
/**
|
|
* Try to open a UDP socket for outgoing communication.
|
|
* Sets sockets options as needed.
|
|
* @param addr: socket address.
|
|
* @param addrlen: length of address.
|
|
* @param port: port override for addr.
|
|
* @param inuse: if -1 is returned, this bool means the port was in use.
|
|
* @return fd or -1
|
|
*/
|
|
static int
|
|
udp_sockport(struct sockaddr_storage* addr, socklen_t addrlen, int port,
|
|
int* inuse)
|
|
{
|
|
int fd, noproto;
|
|
if(addr_is_ip6(addr, addrlen)) {
|
|
struct sockaddr_in6* sa = (struct sockaddr_in6*)addr;
|
|
sa->sin6_port = (in_port_t)htons((uint16_t)port);
|
|
fd = create_udp_sock(AF_INET6, SOCK_DGRAM,
|
|
(struct sockaddr*)addr, addrlen, 1, inuse, &noproto,
|
|
0, 0, 0, NULL, 0);
|
|
} else {
|
|
struct sockaddr_in* sa = (struct sockaddr_in*)addr;
|
|
sa->sin_port = (in_port_t)htons((uint16_t)port);
|
|
fd = create_udp_sock(AF_INET, SOCK_DGRAM,
|
|
(struct sockaddr*)addr, addrlen, 1, inuse, &noproto,
|
|
0, 0, 0, NULL, 0);
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
/** Select random ID */
|
|
static int
|
|
select_id(struct outside_network* outnet, struct pending* pend,
|
|
sldns_buffer* packet)
|
|
{
|
|
int id_tries = 0;
|
|
pend->id = ((unsigned)ub_random(outnet->rnd)>>8) & 0xffff;
|
|
LDNS_ID_SET(sldns_buffer_begin(packet), pend->id);
|
|
|
|
/* insert in tree */
|
|
pend->node.key = pend;
|
|
while(!rbtree_insert(outnet->pending, &pend->node)) {
|
|
/* change ID to avoid collision */
|
|
pend->id = ((unsigned)ub_random(outnet->rnd)>>8) & 0xffff;
|
|
LDNS_ID_SET(sldns_buffer_begin(packet), pend->id);
|
|
id_tries++;
|
|
if(id_tries == MAX_ID_RETRY) {
|
|
pend->id=99999; /* non existant ID */
|
|
log_err("failed to generate unique ID, drop msg");
|
|
return 0;
|
|
}
|
|
}
|
|
verbose(VERB_ALGO, "inserted new pending reply id=%4.4x", pend->id);
|
|
return 1;
|
|
}
|
|
|
|
/** Select random interface and port */
|
|
static int
|
|
select_ifport(struct outside_network* outnet, struct pending* pend,
|
|
int num_if, struct port_if* ifs)
|
|
{
|
|
int my_if, my_port, fd, portno, inuse, tries=0;
|
|
struct port_if* pif;
|
|
/* randomly select interface and port */
|
|
if(num_if == 0) {
|
|
verbose(VERB_QUERY, "Need to send query but have no "
|
|
"outgoing interfaces of that family");
|
|
return 0;
|
|
}
|
|
log_assert(outnet->unused_fds);
|
|
tries = 0;
|
|
while(1) {
|
|
my_if = ub_random_max(outnet->rnd, num_if);
|
|
pif = &ifs[my_if];
|
|
my_port = ub_random_max(outnet->rnd, pif->avail_total);
|
|
if(my_port < pif->inuse) {
|
|
/* port already open */
|
|
pend->pc = pif->out[my_port];
|
|
verbose(VERB_ALGO, "using UDP if=%d port=%d",
|
|
my_if, pend->pc->number);
|
|
break;
|
|
}
|
|
/* try to open new port, if fails, loop to try again */
|
|
log_assert(pif->inuse < pif->maxout);
|
|
portno = pif->avail_ports[my_port - pif->inuse];
|
|
fd = udp_sockport(&pif->addr, pif->addrlen, portno, &inuse);
|
|
if(fd == -1 && !inuse) {
|
|
/* nonrecoverable error making socket */
|
|
return 0;
|
|
}
|
|
if(fd != -1) {
|
|
verbose(VERB_ALGO, "opened UDP if=%d port=%d",
|
|
my_if, portno);
|
|
/* grab fd */
|
|
pend->pc = outnet->unused_fds;
|
|
outnet->unused_fds = pend->pc->next;
|
|
|
|
/* setup portcomm */
|
|
pend->pc->next = NULL;
|
|
pend->pc->number = portno;
|
|
pend->pc->pif = pif;
|
|
pend->pc->index = pif->inuse;
|
|
pend->pc->num_outstanding = 0;
|
|
comm_point_start_listening(pend->pc->cp, fd, -1);
|
|
|
|
/* grab port in interface */
|
|
pif->out[pif->inuse] = pend->pc;
|
|
pif->avail_ports[my_port - pif->inuse] =
|
|
pif->avail_ports[pif->avail_total-pif->inuse-1];
|
|
pif->inuse++;
|
|
break;
|
|
}
|
|
/* failed, already in use */
|
|
verbose(VERB_QUERY, "port %d in use, trying another", portno);
|
|
tries++;
|
|
if(tries == MAX_PORT_RETRY) {
|
|
log_err("failed to find an open port, drop msg");
|
|
return 0;
|
|
}
|
|
}
|
|
log_assert(pend->pc);
|
|
pend->pc->num_outstanding++;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
randomize_and_send_udp(struct pending* pend, sldns_buffer* packet, int timeout)
|
|
{
|
|
struct timeval tv;
|
|
struct outside_network* outnet = pend->sq->outnet;
|
|
|
|
/* select id */
|
|
if(!select_id(outnet, pend, packet)) {
|
|
return 0;
|
|
}
|
|
|
|
/* select src_if, port */
|
|
if(addr_is_ip6(&pend->addr, pend->addrlen)) {
|
|
if(!select_ifport(outnet, pend,
|
|
outnet->num_ip6, outnet->ip6_ifs))
|
|
return 0;
|
|
} else {
|
|
if(!select_ifport(outnet, pend,
|
|
outnet->num_ip4, outnet->ip4_ifs))
|
|
return 0;
|
|
}
|
|
log_assert(pend->pc && pend->pc->cp);
|
|
|
|
/* send it over the commlink */
|
|
if(!comm_point_send_udp_msg(pend->pc->cp, packet,
|
|
(struct sockaddr*)&pend->addr, pend->addrlen)) {
|
|
portcomm_loweruse(outnet, pend->pc);
|
|
return 0;
|
|
}
|
|
|
|
/* system calls to set timeout after sending UDP to make roundtrip
|
|
smaller. */
|
|
#ifndef S_SPLINT_S
|
|
tv.tv_sec = timeout/1000;
|
|
tv.tv_usec = (timeout%1000)*1000;
|
|
#endif
|
|
comm_timer_set(pend->timer, &tv);
|
|
|
|
#ifdef USE_DNSTAP
|
|
if(outnet->dtenv &&
|
|
(outnet->dtenv->log_resolver_query_messages ||
|
|
outnet->dtenv->log_forwarder_query_messages))
|
|
dt_msg_send_outside_query(outnet->dtenv, &pend->addr, comm_udp,
|
|
pend->sq->zone, pend->sq->zonelen, packet);
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
struct pending*
|
|
pending_udp_query(struct serviced_query* sq, struct sldns_buffer* packet,
|
|
int timeout, comm_point_callback_t* cb, void* cb_arg)
|
|
{
|
|
struct pending* pend = (struct pending*)calloc(1, sizeof(*pend));
|
|
if(!pend) return NULL;
|
|
pend->outnet = sq->outnet;
|
|
pend->sq = sq;
|
|
pend->addrlen = sq->addrlen;
|
|
memmove(&pend->addr, &sq->addr, sq->addrlen);
|
|
pend->cb = cb;
|
|
pend->cb_arg = cb_arg;
|
|
pend->node.key = pend;
|
|
pend->timer = comm_timer_create(sq->outnet->base, pending_udp_timer_cb,
|
|
pend);
|
|
if(!pend->timer) {
|
|
free(pend);
|
|
return NULL;
|
|
}
|
|
|
|
if(sq->outnet->unused_fds == NULL) {
|
|
/* no unused fd, cannot create a new port (randomly) */
|
|
verbose(VERB_ALGO, "no fds available, udp query waiting");
|
|
pend->timeout = timeout;
|
|
pend->pkt_len = sldns_buffer_limit(packet);
|
|
pend->pkt = (uint8_t*)memdup(sldns_buffer_begin(packet),
|
|
pend->pkt_len);
|
|
if(!pend->pkt) {
|
|
comm_timer_delete(pend->timer);
|
|
free(pend);
|
|
return NULL;
|
|
}
|
|
/* put at end of waiting list */
|
|
if(sq->outnet->udp_wait_last)
|
|
sq->outnet->udp_wait_last->next_waiting = pend;
|
|
else
|
|
sq->outnet->udp_wait_first = pend;
|
|
sq->outnet->udp_wait_last = pend;
|
|
return pend;
|
|
}
|
|
if(!randomize_and_send_udp(pend, packet, timeout)) {
|
|
pending_delete(sq->outnet, pend);
|
|
return NULL;
|
|
}
|
|
return pend;
|
|
}
|
|
|
|
void
|
|
outnet_tcptimer(void* arg)
|
|
{
|
|
struct waiting_tcp* w = (struct waiting_tcp*)arg;
|
|
struct outside_network* outnet = w->outnet;
|
|
comm_point_callback_t* cb;
|
|
void* cb_arg;
|
|
if(w->pkt) {
|
|
/* it is on the waiting list */
|
|
waiting_list_remove(outnet, w);
|
|
} else {
|
|
/* it was in use */
|
|
struct pending_tcp* pend=(struct pending_tcp*)w->next_waiting;
|
|
comm_point_close(pend->c);
|
|
pend->query = NULL;
|
|
pend->next_free = outnet->tcp_free;
|
|
outnet->tcp_free = pend;
|
|
}
|
|
cb = w->cb;
|
|
cb_arg = w->cb_arg;
|
|
waiting_tcp_delete(w);
|
|
fptr_ok(fptr_whitelist_pending_tcp(cb));
|
|
(void)(*cb)(NULL, cb_arg, NETEVENT_TIMEOUT, NULL);
|
|
use_free_buffer(outnet);
|
|
}
|
|
|
|
struct waiting_tcp*
|
|
pending_tcp_query(struct serviced_query* sq, sldns_buffer* packet,
|
|
int timeout, comm_point_callback_t* callback, void* callback_arg)
|
|
{
|
|
struct pending_tcp* pend = sq->outnet->tcp_free;
|
|
struct waiting_tcp* w;
|
|
struct timeval tv;
|
|
uint16_t id;
|
|
/* if no buffer is free allocate space to store query */
|
|
w = (struct waiting_tcp*)malloc(sizeof(struct waiting_tcp)
|
|
+ (pend?0:sldns_buffer_limit(packet)));
|
|
if(!w) {
|
|
return NULL;
|
|
}
|
|
if(!(w->timer = comm_timer_create(sq->outnet->base, outnet_tcptimer, w))) {
|
|
free(w);
|
|
return NULL;
|
|
}
|
|
w->pkt = NULL;
|
|
w->pkt_len = 0;
|
|
id = ((unsigned)ub_random(sq->outnet->rnd)>>8) & 0xffff;
|
|
LDNS_ID_SET(sldns_buffer_begin(packet), id);
|
|
memcpy(&w->addr, &sq->addr, sq->addrlen);
|
|
w->addrlen = sq->addrlen;
|
|
w->outnet = sq->outnet;
|
|
w->cb = callback;
|
|
w->cb_arg = callback_arg;
|
|
w->ssl_upstream = sq->ssl_upstream;
|
|
#ifndef S_SPLINT_S
|
|
tv.tv_sec = timeout;
|
|
tv.tv_usec = 0;
|
|
#endif
|
|
comm_timer_set(w->timer, &tv);
|
|
if(pend) {
|
|
/* we have a buffer available right now */
|
|
if(!outnet_tcp_take_into_use(w, sldns_buffer_begin(packet),
|
|
sldns_buffer_limit(packet))) {
|
|
waiting_tcp_delete(w);
|
|
return NULL;
|
|
}
|
|
#ifdef USE_DNSTAP
|
|
if(sq->outnet->dtenv &&
|
|
(sq->outnet->dtenv->log_resolver_query_messages ||
|
|
sq->outnet->dtenv->log_forwarder_query_messages))
|
|
dt_msg_send_outside_query(sq->outnet->dtenv, &sq->addr,
|
|
comm_tcp, sq->zone, sq->zonelen, packet);
|
|
#endif
|
|
} else {
|
|
/* queue up */
|
|
w->pkt = (uint8_t*)w + sizeof(struct waiting_tcp);
|
|
w->pkt_len = sldns_buffer_limit(packet);
|
|
memmove(w->pkt, sldns_buffer_begin(packet), w->pkt_len);
|
|
w->next_waiting = NULL;
|
|
if(sq->outnet->tcp_wait_last)
|
|
sq->outnet->tcp_wait_last->next_waiting = w;
|
|
else sq->outnet->tcp_wait_first = w;
|
|
sq->outnet->tcp_wait_last = w;
|
|
}
|
|
return w;
|
|
}
|
|
|
|
/** create query for serviced queries */
|
|
static void
|
|
serviced_gen_query(sldns_buffer* buff, uint8_t* qname, size_t qnamelen,
|
|
uint16_t qtype, uint16_t qclass, uint16_t flags)
|
|
{
|
|
sldns_buffer_clear(buff);
|
|
/* skip id */
|
|
sldns_buffer_write_u16(buff, flags);
|
|
sldns_buffer_write_u16(buff, 1); /* qdcount */
|
|
sldns_buffer_write_u16(buff, 0); /* ancount */
|
|
sldns_buffer_write_u16(buff, 0); /* nscount */
|
|
sldns_buffer_write_u16(buff, 0); /* arcount */
|
|
sldns_buffer_write(buff, qname, qnamelen);
|
|
sldns_buffer_write_u16(buff, qtype);
|
|
sldns_buffer_write_u16(buff, qclass);
|
|
sldns_buffer_flip(buff);
|
|
}
|
|
|
|
/** lookup serviced query in serviced query rbtree */
|
|
static struct serviced_query*
|
|
lookup_serviced(struct outside_network* outnet, sldns_buffer* buff, int dnssec,
|
|
struct sockaddr_storage* addr, socklen_t addrlen)
|
|
{
|
|
struct serviced_query key;
|
|
key.node.key = &key;
|
|
key.qbuf = sldns_buffer_begin(buff);
|
|
key.qbuflen = sldns_buffer_limit(buff);
|
|
key.dnssec = dnssec;
|
|
memcpy(&key.addr, addr, addrlen);
|
|
key.addrlen = addrlen;
|
|
key.outnet = outnet;
|
|
return (struct serviced_query*)rbtree_search(outnet->serviced, &key);
|
|
}
|
|
|
|
/** Create new serviced entry */
|
|
static struct serviced_query*
|
|
serviced_create(struct outside_network* outnet, sldns_buffer* buff, int dnssec,
|
|
int want_dnssec, int nocaps, int tcp_upstream, int ssl_upstream,
|
|
struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone,
|
|
size_t zonelen, int qtype)
|
|
{
|
|
struct serviced_query* sq = (struct serviced_query*)malloc(sizeof(*sq));
|
|
#ifdef UNBOUND_DEBUG
|
|
rbnode_t* ins;
|
|
#endif
|
|
if(!sq)
|
|
return NULL;
|
|
sq->node.key = sq;
|
|
sq->qbuf = memdup(sldns_buffer_begin(buff), sldns_buffer_limit(buff));
|
|
if(!sq->qbuf) {
|
|
free(sq);
|
|
return NULL;
|
|
}
|
|
sq->qbuflen = sldns_buffer_limit(buff);
|
|
sq->zone = memdup(zone, zonelen);
|
|
if(!sq->zone) {
|
|
free(sq->qbuf);
|
|
free(sq);
|
|
return NULL;
|
|
}
|
|
sq->zonelen = zonelen;
|
|
sq->qtype = qtype;
|
|
sq->dnssec = dnssec;
|
|
sq->want_dnssec = want_dnssec;
|
|
sq->nocaps = nocaps;
|
|
sq->tcp_upstream = tcp_upstream;
|
|
sq->ssl_upstream = ssl_upstream;
|
|
memcpy(&sq->addr, addr, addrlen);
|
|
sq->addrlen = addrlen;
|
|
sq->outnet = outnet;
|
|
sq->cblist = NULL;
|
|
sq->pending = NULL;
|
|
sq->status = serviced_initial;
|
|
sq->retry = 0;
|
|
sq->to_be_deleted = 0;
|
|
#ifdef UNBOUND_DEBUG
|
|
ins =
|
|
#else
|
|
(void)
|
|
#endif
|
|
rbtree_insert(outnet->serviced, &sq->node);
|
|
log_assert(ins != NULL); /* must not be already present */
|
|
return sq;
|
|
}
|
|
|
|
/** remove waiting tcp from the outnet waiting list */
|
|
static void
|
|
waiting_list_remove(struct outside_network* outnet, struct waiting_tcp* w)
|
|
{
|
|
struct waiting_tcp* p = outnet->tcp_wait_first, *prev = NULL;
|
|
while(p) {
|
|
if(p == w) {
|
|
/* remove w */
|
|
if(prev)
|
|
prev->next_waiting = w->next_waiting;
|
|
else outnet->tcp_wait_first = w->next_waiting;
|
|
if(outnet->tcp_wait_last == w)
|
|
outnet->tcp_wait_last = prev;
|
|
return;
|
|
}
|
|
prev = p;
|
|
p = p->next_waiting;
|
|
}
|
|
}
|
|
|
|
/** cleanup serviced query entry */
|
|
static void
|
|
serviced_delete(struct serviced_query* sq)
|
|
{
|
|
if(sq->pending) {
|
|
/* clear up the pending query */
|
|
if(sq->status == serviced_query_UDP_EDNS ||
|
|
sq->status == serviced_query_UDP ||
|
|
sq->status == serviced_query_PROBE_EDNS ||
|
|
sq->status == serviced_query_UDP_EDNS_FRAG ||
|
|
sq->status == serviced_query_UDP_EDNS_fallback) {
|
|
struct pending* p = (struct pending*)sq->pending;
|
|
if(p->pc)
|
|
portcomm_loweruse(sq->outnet, p->pc);
|
|
pending_delete(sq->outnet, p);
|
|
/* this call can cause reentrant calls back into the
|
|
* mesh */
|
|
outnet_send_wait_udp(sq->outnet);
|
|
} else {
|
|
struct waiting_tcp* p = (struct waiting_tcp*)
|
|
sq->pending;
|
|
if(p->pkt == NULL) {
|
|
decomission_pending_tcp(sq->outnet,
|
|
(struct pending_tcp*)p->next_waiting);
|
|
} else {
|
|
waiting_list_remove(sq->outnet, p);
|
|
waiting_tcp_delete(p);
|
|
}
|
|
}
|
|
}
|
|
/* does not delete from tree, caller has to do that */
|
|
serviced_node_del(&sq->node, NULL);
|
|
}
|
|
|
|
/** perturb a dname capitalization randomly */
|
|
static void
|
|
serviced_perturb_qname(struct ub_randstate* rnd, uint8_t* qbuf, size_t len)
|
|
{
|
|
uint8_t lablen;
|
|
uint8_t* d = qbuf + 10;
|
|
long int random = 0;
|
|
int bits = 0;
|
|
log_assert(len >= 10 + 5 /* offset qname, root, qtype, qclass */);
|
|
lablen = *d++;
|
|
while(lablen) {
|
|
while(lablen--) {
|
|
/* only perturb A-Z, a-z */
|
|
if(isalpha((unsigned char)*d)) {
|
|
/* get a random bit */
|
|
if(bits == 0) {
|
|
random = ub_random(rnd);
|
|
bits = 30;
|
|
}
|
|
if(random & 0x1) {
|
|
*d = (uint8_t)toupper((unsigned char)*d);
|
|
} else {
|
|
*d = (uint8_t)tolower((unsigned char)*d);
|
|
}
|
|
random >>= 1;
|
|
bits--;
|
|
}
|
|
d++;
|
|
}
|
|
lablen = *d++;
|
|
}
|
|
if(verbosity >= VERB_ALGO) {
|
|
char buf[LDNS_MAX_DOMAINLEN+1];
|
|
dname_str(qbuf+10, buf);
|
|
verbose(VERB_ALGO, "qname perturbed to %s", buf);
|
|
}
|
|
}
|
|
|
|
/** put serviced query into a buffer */
|
|
static void
|
|
serviced_encode(struct serviced_query* sq, sldns_buffer* buff, int with_edns)
|
|
{
|
|
/* if we are using 0x20 bits for ID randomness, perturb them */
|
|
if(sq->outnet->use_caps_for_id && !sq->nocaps) {
|
|
serviced_perturb_qname(sq->outnet->rnd, sq->qbuf, sq->qbuflen);
|
|
}
|
|
/* generate query */
|
|
sldns_buffer_clear(buff);
|
|
sldns_buffer_write_u16(buff, 0); /* id placeholder */
|
|
sldns_buffer_write(buff, sq->qbuf, sq->qbuflen);
|
|
sldns_buffer_flip(buff);
|
|
if(with_edns) {
|
|
/* add edns section */
|
|
struct edns_data edns;
|
|
edns.edns_present = 1;
|
|
edns.ext_rcode = 0;
|
|
edns.edns_version = EDNS_ADVERTISED_VERSION;
|
|
if(sq->status == serviced_query_UDP_EDNS_FRAG) {
|
|
if(addr_is_ip6(&sq->addr, sq->addrlen)) {
|
|
if(EDNS_FRAG_SIZE_IP6 < EDNS_ADVERTISED_SIZE)
|
|
edns.udp_size = EDNS_FRAG_SIZE_IP6;
|
|
else edns.udp_size = EDNS_ADVERTISED_SIZE;
|
|
} else {
|
|
if(EDNS_FRAG_SIZE_IP4 < EDNS_ADVERTISED_SIZE)
|
|
edns.udp_size = EDNS_FRAG_SIZE_IP4;
|
|
else edns.udp_size = EDNS_ADVERTISED_SIZE;
|
|
}
|
|
} else {
|
|
edns.udp_size = EDNS_ADVERTISED_SIZE;
|
|
}
|
|
edns.bits = 0;
|
|
if(sq->dnssec & EDNS_DO)
|
|
edns.bits = EDNS_DO;
|
|
if(sq->dnssec & BIT_CD)
|
|
LDNS_CD_SET(sldns_buffer_begin(buff));
|
|
attach_edns_record(buff, &edns);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Perform serviced query UDP sending operation.
|
|
* Sends UDP with EDNS, unless infra host marked non EDNS.
|
|
* @param sq: query to send.
|
|
* @param buff: buffer scratch space.
|
|
* @return 0 on error.
|
|
*/
|
|
static int
|
|
serviced_udp_send(struct serviced_query* sq, sldns_buffer* buff)
|
|
{
|
|
int rtt, vs;
|
|
uint8_t edns_lame_known;
|
|
time_t now = *sq->outnet->now_secs;
|
|
|
|
if(!infra_host(sq->outnet->infra, &sq->addr, sq->addrlen, sq->zone,
|
|
sq->zonelen, now, &vs, &edns_lame_known, &rtt))
|
|
return 0;
|
|
sq->last_rtt = rtt;
|
|
verbose(VERB_ALGO, "EDNS lookup known=%d vs=%d", edns_lame_known, vs);
|
|
if(sq->status == serviced_initial) {
|
|
if(edns_lame_known == 0 && rtt > 5000 && rtt < 10001) {
|
|
/* perform EDNS lame probe - check if server is
|
|
* EDNS lame (EDNS queries to it are dropped) */
|
|
verbose(VERB_ALGO, "serviced query: send probe to see "
|
|
" if use of EDNS causes timeouts");
|
|
/* even 700 msec may be too small */
|
|
rtt = 1000;
|
|
sq->status = serviced_query_PROBE_EDNS;
|
|
} else if(vs != -1) {
|
|
sq->status = serviced_query_UDP_EDNS;
|
|
} else {
|
|
sq->status = serviced_query_UDP;
|
|
}
|
|
}
|
|
serviced_encode(sq, buff, (sq->status == serviced_query_UDP_EDNS) ||
|
|
(sq->status == serviced_query_UDP_EDNS_FRAG));
|
|
sq->last_sent_time = *sq->outnet->now_tv;
|
|
sq->edns_lame_known = (int)edns_lame_known;
|
|
verbose(VERB_ALGO, "serviced query UDP timeout=%d msec", rtt);
|
|
sq->pending = pending_udp_query(sq, buff, rtt,
|
|
serviced_udp_callback, sq);
|
|
if(!sq->pending)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/** check that perturbed qname is identical */
|
|
static int
|
|
serviced_check_qname(sldns_buffer* pkt, uint8_t* qbuf, size_t qbuflen)
|
|
{
|
|
uint8_t* d1 = sldns_buffer_at(pkt, 12);
|
|
uint8_t* d2 = qbuf+10;
|
|
uint8_t len1, len2;
|
|
int count = 0;
|
|
log_assert(qbuflen >= 15 /* 10 header, root, type, class */);
|
|
len1 = *d1++;
|
|
len2 = *d2++;
|
|
if(sldns_buffer_limit(pkt) < 12+1+4) /* packet too small for qname */
|
|
return 0;
|
|
while(len1 != 0 || len2 != 0) {
|
|
if(LABEL_IS_PTR(len1)) {
|
|
d1 = sldns_buffer_at(pkt, PTR_OFFSET(len1, *d1));
|
|
if(d1 >= sldns_buffer_at(pkt, sldns_buffer_limit(pkt)))
|
|
return 0;
|
|
len1 = *d1++;
|
|
if(count++ > MAX_COMPRESS_PTRS)
|
|
return 0;
|
|
continue;
|
|
}
|
|
if(d2 > qbuf+qbuflen)
|
|
return 0;
|
|
if(len1 != len2)
|
|
return 0;
|
|
if(len1 > LDNS_MAX_LABELLEN)
|
|
return 0;
|
|
log_assert(len1 <= LDNS_MAX_LABELLEN);
|
|
log_assert(len2 <= LDNS_MAX_LABELLEN);
|
|
log_assert(len1 == len2 && len1 != 0);
|
|
/* compare the labels - bitwise identical */
|
|
if(memcmp(d1, d2, len1) != 0)
|
|
return 0;
|
|
d1 += len1;
|
|
d2 += len2;
|
|
len1 = *d1++;
|
|
len2 = *d2++;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/** call the callbacks for a serviced query */
|
|
static void
|
|
serviced_callbacks(struct serviced_query* sq, int error, struct comm_point* c,
|
|
struct comm_reply* rep)
|
|
{
|
|
struct service_callback* p;
|
|
int dobackup = (sq->cblist && sq->cblist->next); /* >1 cb*/
|
|
uint8_t *backup_p = NULL;
|
|
size_t backlen = 0;
|
|
#ifdef UNBOUND_DEBUG
|
|
rbnode_t* rem =
|
|
#else
|
|
(void)
|
|
#endif
|
|
/* remove from tree, and schedule for deletion, so that callbacks
|
|
* can safely deregister themselves and even create new serviced
|
|
* queries that are identical to this one. */
|
|
rbtree_delete(sq->outnet->serviced, sq);
|
|
log_assert(rem); /* should have been present */
|
|
sq->to_be_deleted = 1;
|
|
verbose(VERB_ALGO, "svcd callbacks start");
|
|
if(sq->outnet->use_caps_for_id && error == NETEVENT_NOERROR && c) {
|
|
/* noerror and nxdomain must have a qname in reply */
|
|
if(sldns_buffer_read_u16_at(c->buffer, 4) == 0 &&
|
|
(LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer))
|
|
== LDNS_RCODE_NOERROR ||
|
|
LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer))
|
|
== LDNS_RCODE_NXDOMAIN)) {
|
|
verbose(VERB_DETAIL, "no qname in reply to check 0x20ID");
|
|
log_addr(VERB_DETAIL, "from server",
|
|
&sq->addr, sq->addrlen);
|
|
log_buf(VERB_DETAIL, "for packet", c->buffer);
|
|
error = NETEVENT_CLOSED;
|
|
c = NULL;
|
|
} else if(sldns_buffer_read_u16_at(c->buffer, 4) > 0 &&
|
|
!serviced_check_qname(c->buffer, sq->qbuf,
|
|
sq->qbuflen)) {
|
|
verbose(VERB_DETAIL, "wrong 0x20-ID in reply qname");
|
|
log_addr(VERB_DETAIL, "from server",
|
|
&sq->addr, sq->addrlen);
|
|
log_buf(VERB_DETAIL, "for packet", c->buffer);
|
|
error = NETEVENT_CAPSFAIL;
|
|
/* and cleanup too */
|
|
pkt_dname_tolower(c->buffer,
|
|
sldns_buffer_at(c->buffer, 12));
|
|
} else {
|
|
verbose(VERB_ALGO, "good 0x20-ID in reply qname");
|
|
/* cleanup caps, prettier cache contents. */
|
|
pkt_dname_tolower(c->buffer,
|
|
sldns_buffer_at(c->buffer, 12));
|
|
}
|
|
}
|
|
if(dobackup && c) {
|
|
/* make a backup of the query, since the querystate processing
|
|
* may send outgoing queries that overwrite the buffer.
|
|
* use secondary buffer to store the query.
|
|
* This is a data copy, but faster than packet to server */
|
|
backlen = sldns_buffer_limit(c->buffer);
|
|
backup_p = memdup(sldns_buffer_begin(c->buffer), backlen);
|
|
if(!backup_p) {
|
|
log_err("malloc failure in serviced query callbacks");
|
|
error = NETEVENT_CLOSED;
|
|
c = NULL;
|
|
}
|
|
sq->outnet->svcd_overhead = backlen;
|
|
}
|
|
/* test the actual sq->cblist, because the next elem could be deleted*/
|
|
while((p=sq->cblist) != NULL) {
|
|
sq->cblist = p->next; /* remove this element */
|
|
if(dobackup && c) {
|
|
sldns_buffer_clear(c->buffer);
|
|
sldns_buffer_write(c->buffer, backup_p, backlen);
|
|
sldns_buffer_flip(c->buffer);
|
|
}
|
|
fptr_ok(fptr_whitelist_serviced_query(p->cb));
|
|
(void)(*p->cb)(c, p->cb_arg, error, rep);
|
|
free(p);
|
|
}
|
|
if(backup_p) {
|
|
free(backup_p);
|
|
sq->outnet->svcd_overhead = 0;
|
|
}
|
|
verbose(VERB_ALGO, "svcd callbacks end");
|
|
log_assert(sq->cblist == NULL);
|
|
serviced_delete(sq);
|
|
}
|
|
|
|
int
|
|
serviced_tcp_callback(struct comm_point* c, void* arg, int error,
|
|
struct comm_reply* rep)
|
|
{
|
|
struct serviced_query* sq = (struct serviced_query*)arg;
|
|
struct comm_reply r2;
|
|
sq->pending = NULL; /* removed after this callback */
|
|
if(error != NETEVENT_NOERROR)
|
|
log_addr(VERB_QUERY, "tcp error for address",
|
|
&sq->addr, sq->addrlen);
|
|
if(error==NETEVENT_NOERROR)
|
|
infra_update_tcp_works(sq->outnet->infra, &sq->addr,
|
|
sq->addrlen, sq->zone, sq->zonelen);
|
|
#ifdef USE_DNSTAP
|
|
if(sq->outnet->dtenv &&
|
|
(sq->outnet->dtenv->log_resolver_response_messages ||
|
|
sq->outnet->dtenv->log_forwarder_response_messages))
|
|
dt_msg_send_outside_response(sq->outnet->dtenv, &sq->addr,
|
|
c->type, sq->zone, sq->zonelen, sq->qbuf, sq->qbuflen,
|
|
&sq->last_sent_time, sq->outnet->now_tv, c->buffer);
|
|
#endif
|
|
if(error==NETEVENT_NOERROR && sq->status == serviced_query_TCP_EDNS &&
|
|
(LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
|
|
LDNS_RCODE_FORMERR || LDNS_RCODE_WIRE(sldns_buffer_begin(
|
|
c->buffer)) == LDNS_RCODE_NOTIMPL) ) {
|
|
/* attempt to fallback to nonEDNS */
|
|
sq->status = serviced_query_TCP_EDNS_fallback;
|
|
serviced_tcp_initiate(sq, c->buffer);
|
|
return 0;
|
|
} else if(error==NETEVENT_NOERROR &&
|
|
sq->status == serviced_query_TCP_EDNS_fallback &&
|
|
(LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
|
|
LDNS_RCODE_NOERROR || LDNS_RCODE_WIRE(
|
|
sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NXDOMAIN
|
|
|| LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer))
|
|
== LDNS_RCODE_YXDOMAIN)) {
|
|
/* the fallback produced a result that looks promising, note
|
|
* that this server should be approached without EDNS */
|
|
/* only store noEDNS in cache if domain is noDNSSEC */
|
|
if(!sq->want_dnssec)
|
|
if(!infra_edns_update(sq->outnet->infra, &sq->addr,
|
|
sq->addrlen, sq->zone, sq->zonelen, -1,
|
|
*sq->outnet->now_secs))
|
|
log_err("Out of memory caching no edns for host");
|
|
sq->status = serviced_query_TCP;
|
|
}
|
|
if(sq->tcp_upstream || sq->ssl_upstream) {
|
|
struct timeval now = *sq->outnet->now_tv;
|
|
if(now.tv_sec > sq->last_sent_time.tv_sec ||
|
|
(now.tv_sec == sq->last_sent_time.tv_sec &&
|
|
now.tv_usec > sq->last_sent_time.tv_usec)) {
|
|
/* convert from microseconds to milliseconds */
|
|
int roundtime = ((int)(now.tv_sec - sq->last_sent_time.tv_sec))*1000
|
|
+ ((int)now.tv_usec - (int)sq->last_sent_time.tv_usec)/1000;
|
|
verbose(VERB_ALGO, "measured TCP-time at %d msec", roundtime);
|
|
log_assert(roundtime >= 0);
|
|
/* only store if less then AUTH_TIMEOUT seconds, it could be
|
|
* huge due to system-hibernated and we woke up */
|
|
if(roundtime < TCP_AUTH_QUERY_TIMEOUT*1000) {
|
|
if(!infra_rtt_update(sq->outnet->infra, &sq->addr,
|
|
sq->addrlen, sq->zone, sq->zonelen, sq->qtype,
|
|
roundtime, sq->last_rtt, (time_t)now.tv_sec))
|
|
log_err("out of memory noting rtt.");
|
|
}
|
|
}
|
|
}
|
|
/* insert address into reply info */
|
|
if(!rep) {
|
|
/* create one if there isn't (on errors) */
|
|
rep = &r2;
|
|
r2.c = c;
|
|
}
|
|
memcpy(&rep->addr, &sq->addr, sq->addrlen);
|
|
rep->addrlen = sq->addrlen;
|
|
serviced_callbacks(sq, error, c, rep);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
serviced_tcp_initiate(struct serviced_query* sq, sldns_buffer* buff)
|
|
{
|
|
verbose(VERB_ALGO, "initiate TCP query %s",
|
|
sq->status==serviced_query_TCP_EDNS?"EDNS":"");
|
|
serviced_encode(sq, buff, sq->status == serviced_query_TCP_EDNS);
|
|
sq->last_sent_time = *sq->outnet->now_tv;
|
|
sq->pending = pending_tcp_query(sq, buff, TCP_AUTH_QUERY_TIMEOUT,
|
|
serviced_tcp_callback, sq);
|
|
if(!sq->pending) {
|
|
/* delete from tree so that a retry by above layer does not
|
|
* clash with this entry */
|
|
log_err("serviced_tcp_initiate: failed to send tcp query");
|
|
serviced_callbacks(sq, NETEVENT_CLOSED, NULL, NULL);
|
|
}
|
|
}
|
|
|
|
/** Send serviced query over TCP return false on initial failure */
|
|
static int
|
|
serviced_tcp_send(struct serviced_query* sq, sldns_buffer* buff)
|
|
{
|
|
int vs, rtt;
|
|
uint8_t edns_lame_known;
|
|
if(!infra_host(sq->outnet->infra, &sq->addr, sq->addrlen, sq->zone,
|
|
sq->zonelen, *sq->outnet->now_secs, &vs, &edns_lame_known,
|
|
&rtt))
|
|
return 0;
|
|
if(vs != -1)
|
|
sq->status = serviced_query_TCP_EDNS;
|
|
else sq->status = serviced_query_TCP;
|
|
serviced_encode(sq, buff, sq->status == serviced_query_TCP_EDNS);
|
|
sq->last_sent_time = *sq->outnet->now_tv;
|
|
sq->pending = pending_tcp_query(sq, buff, TCP_AUTH_QUERY_TIMEOUT,
|
|
serviced_tcp_callback, sq);
|
|
return sq->pending != NULL;
|
|
}
|
|
|
|
int
|
|
serviced_udp_callback(struct comm_point* c, void* arg, int error,
|
|
struct comm_reply* rep)
|
|
{
|
|
struct serviced_query* sq = (struct serviced_query*)arg;
|
|
struct outside_network* outnet = sq->outnet;
|
|
struct timeval now = *sq->outnet->now_tv;
|
|
int fallback_tcp = 0;
|
|
|
|
sq->pending = NULL; /* removed after callback */
|
|
if(error == NETEVENT_TIMEOUT) {
|
|
int rto = 0;
|
|
if(sq->status == serviced_query_PROBE_EDNS) {
|
|
/* non-EDNS probe failed; we do not know its status,
|
|
* keep trying with EDNS, timeout may not be caused
|
|
* by EDNS. */
|
|
sq->status = serviced_query_UDP_EDNS;
|
|
}
|
|
if(sq->status == serviced_query_UDP_EDNS && sq->last_rtt < 5000) {
|
|
/* fallback to 1480/1280 */
|
|
sq->status = serviced_query_UDP_EDNS_FRAG;
|
|
log_name_addr(VERB_ALGO, "try edns1xx0", sq->qbuf+10,
|
|
&sq->addr, sq->addrlen);
|
|
if(!serviced_udp_send(sq, c->buffer)) {
|
|
serviced_callbacks(sq, NETEVENT_CLOSED, c, rep);
|
|
}
|
|
return 0;
|
|
}
|
|
if(sq->status == serviced_query_UDP_EDNS_FRAG) {
|
|
/* fragmentation size did not fix it */
|
|
sq->status = serviced_query_UDP_EDNS;
|
|
}
|
|
sq->retry++;
|
|
if(!(rto=infra_rtt_update(outnet->infra, &sq->addr, sq->addrlen,
|
|
sq->zone, sq->zonelen, sq->qtype, -1, sq->last_rtt,
|
|
(time_t)now.tv_sec)))
|
|
log_err("out of memory in UDP exponential backoff");
|
|
if(sq->retry < OUTBOUND_UDP_RETRY) {
|
|
log_name_addr(VERB_ALGO, "retry query", sq->qbuf+10,
|
|
&sq->addr, sq->addrlen);
|
|
if(!serviced_udp_send(sq, c->buffer)) {
|
|
serviced_callbacks(sq, NETEVENT_CLOSED, c, rep);
|
|
}
|
|
return 0;
|
|
}
|
|
if(rto >= RTT_MAX_TIMEOUT) {
|
|
fallback_tcp = 1;
|
|
/* UDP does not work, fallback to TCP below */
|
|
} else {
|
|
serviced_callbacks(sq, NETEVENT_TIMEOUT, c, rep);
|
|
return 0;
|
|
}
|
|
} else if(error != NETEVENT_NOERROR) {
|
|
/* udp returns error (due to no ID or interface available) */
|
|
serviced_callbacks(sq, error, c, rep);
|
|
return 0;
|
|
}
|
|
#ifdef USE_DNSTAP
|
|
if(outnet->dtenv &&
|
|
(outnet->dtenv->log_resolver_response_messages ||
|
|
outnet->dtenv->log_forwarder_response_messages))
|
|
dt_msg_send_outside_response(outnet->dtenv, &sq->addr, c->type,
|
|
sq->zone, sq->zonelen, sq->qbuf, sq->qbuflen,
|
|
&sq->last_sent_time, sq->outnet->now_tv, c->buffer);
|
|
#endif
|
|
if(!fallback_tcp) {
|
|
if( (sq->status == serviced_query_UDP_EDNS
|
|
||sq->status == serviced_query_UDP_EDNS_FRAG)
|
|
&& (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer))
|
|
== LDNS_RCODE_FORMERR || LDNS_RCODE_WIRE(
|
|
sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NOTIMPL)) {
|
|
/* try to get an answer by falling back without EDNS */
|
|
verbose(VERB_ALGO, "serviced query: attempt without EDNS");
|
|
sq->status = serviced_query_UDP_EDNS_fallback;
|
|
sq->retry = 0;
|
|
if(!serviced_udp_send(sq, c->buffer)) {
|
|
serviced_callbacks(sq, NETEVENT_CLOSED, c, rep);
|
|
}
|
|
return 0;
|
|
} else if(sq->status == serviced_query_PROBE_EDNS) {
|
|
/* probe without EDNS succeeds, so we conclude that this
|
|
* host likely has EDNS packets dropped */
|
|
log_addr(VERB_DETAIL, "timeouts, concluded that connection to "
|
|
"host drops EDNS packets", &sq->addr, sq->addrlen);
|
|
/* only store noEDNS in cache if domain is noDNSSEC */
|
|
if(!sq->want_dnssec)
|
|
if(!infra_edns_update(outnet->infra, &sq->addr, sq->addrlen,
|
|
sq->zone, sq->zonelen, -1, (time_t)now.tv_sec)) {
|
|
log_err("Out of memory caching no edns for host");
|
|
}
|
|
sq->status = serviced_query_UDP;
|
|
} else if(sq->status == serviced_query_UDP_EDNS &&
|
|
!sq->edns_lame_known) {
|
|
/* now we know that edns queries received answers store that */
|
|
log_addr(VERB_ALGO, "serviced query: EDNS works for",
|
|
&sq->addr, sq->addrlen);
|
|
if(!infra_edns_update(outnet->infra, &sq->addr, sq->addrlen,
|
|
sq->zone, sq->zonelen, 0, (time_t)now.tv_sec)) {
|
|
log_err("Out of memory caching edns works");
|
|
}
|
|
sq->edns_lame_known = 1;
|
|
} else if(sq->status == serviced_query_UDP_EDNS_fallback &&
|
|
!sq->edns_lame_known && (LDNS_RCODE_WIRE(
|
|
sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NOERROR ||
|
|
LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
|
|
LDNS_RCODE_NXDOMAIN || LDNS_RCODE_WIRE(sldns_buffer_begin(
|
|
c->buffer)) == LDNS_RCODE_YXDOMAIN)) {
|
|
/* the fallback produced a result that looks promising, note
|
|
* that this server should be approached without EDNS */
|
|
/* only store noEDNS in cache if domain is noDNSSEC */
|
|
if(!sq->want_dnssec) {
|
|
log_addr(VERB_ALGO, "serviced query: EDNS fails for",
|
|
&sq->addr, sq->addrlen);
|
|
if(!infra_edns_update(outnet->infra, &sq->addr, sq->addrlen,
|
|
sq->zone, sq->zonelen, -1, (time_t)now.tv_sec)) {
|
|
log_err("Out of memory caching no edns for host");
|
|
}
|
|
} else {
|
|
log_addr(VERB_ALGO, "serviced query: EDNS fails, but "
|
|
"not stored because need DNSSEC for", &sq->addr,
|
|
sq->addrlen);
|
|
}
|
|
sq->status = serviced_query_UDP;
|
|
}
|
|
if(now.tv_sec > sq->last_sent_time.tv_sec ||
|
|
(now.tv_sec == sq->last_sent_time.tv_sec &&
|
|
now.tv_usec > sq->last_sent_time.tv_usec)) {
|
|
/* convert from microseconds to milliseconds */
|
|
int roundtime = ((int)(now.tv_sec - sq->last_sent_time.tv_sec))*1000
|
|
+ ((int)now.tv_usec - (int)sq->last_sent_time.tv_usec)/1000;
|
|
verbose(VERB_ALGO, "measured roundtrip at %d msec", roundtime);
|
|
log_assert(roundtime >= 0);
|
|
/* in case the system hibernated, do not enter a huge value,
|
|
* above this value gives trouble with server selection */
|
|
if(roundtime < 60000) {
|
|
if(!infra_rtt_update(outnet->infra, &sq->addr, sq->addrlen,
|
|
sq->zone, sq->zonelen, sq->qtype, roundtime,
|
|
sq->last_rtt, (time_t)now.tv_sec))
|
|
log_err("out of memory noting rtt.");
|
|
}
|
|
}
|
|
} /* end of if_!fallback_tcp */
|
|
/* perform TC flag check and TCP fallback after updating our
|
|
* cache entries for EDNS status and RTT times */
|
|
if(LDNS_TC_WIRE(sldns_buffer_begin(c->buffer)) || fallback_tcp) {
|
|
/* fallback to TCP */
|
|
/* this discards partial UDP contents */
|
|
if(sq->status == serviced_query_UDP_EDNS ||
|
|
sq->status == serviced_query_UDP_EDNS_FRAG ||
|
|
sq->status == serviced_query_UDP_EDNS_fallback)
|
|
/* if we have unfinished EDNS_fallback, start again */
|
|
sq->status = serviced_query_TCP_EDNS;
|
|
else sq->status = serviced_query_TCP;
|
|
serviced_tcp_initiate(sq, c->buffer);
|
|
return 0;
|
|
}
|
|
/* yay! an answer */
|
|
serviced_callbacks(sq, error, c, rep);
|
|
return 0;
|
|
}
|
|
|
|
struct serviced_query*
|
|
outnet_serviced_query(struct outside_network* outnet,
|
|
uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass,
|
|
uint16_t flags, int dnssec, int want_dnssec, int nocaps,
|
|
int tcp_upstream, int ssl_upstream, struct sockaddr_storage* addr,
|
|
socklen_t addrlen, uint8_t* zone, size_t zonelen,
|
|
comm_point_callback_t* callback, void* callback_arg,
|
|
sldns_buffer* buff)
|
|
{
|
|
struct serviced_query* sq;
|
|
struct service_callback* cb;
|
|
serviced_gen_query(buff, qname, qnamelen, qtype, qclass, flags);
|
|
sq = lookup_serviced(outnet, buff, dnssec, addr, addrlen);
|
|
/* duplicate entries are included in the callback list, because
|
|
* there is a counterpart registration by our caller that needs to
|
|
* be doubly-removed (with callbacks perhaps). */
|
|
if(!(cb = (struct service_callback*)malloc(sizeof(*cb))))
|
|
return NULL;
|
|
if(!sq) {
|
|
/* make new serviced query entry */
|
|
sq = serviced_create(outnet, buff, dnssec, want_dnssec, nocaps,
|
|
tcp_upstream, ssl_upstream, addr, addrlen, zone,
|
|
zonelen, (int)qtype);
|
|
if(!sq) {
|
|
free(cb);
|
|
return NULL;
|
|
}
|
|
/* perform first network action */
|
|
if(outnet->do_udp && !(tcp_upstream || ssl_upstream)) {
|
|
if(!serviced_udp_send(sq, buff)) {
|
|
(void)rbtree_delete(outnet->serviced, sq);
|
|
free(sq->qbuf);
|
|
free(sq->zone);
|
|
free(sq);
|
|
free(cb);
|
|
return NULL;
|
|
}
|
|
} else {
|
|
if(!serviced_tcp_send(sq, buff)) {
|
|
(void)rbtree_delete(outnet->serviced, sq);
|
|
free(sq->qbuf);
|
|
free(sq->zone);
|
|
free(sq);
|
|
free(cb);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
/* add callback to list of callbacks */
|
|
cb->cb = callback;
|
|
cb->cb_arg = callback_arg;
|
|
cb->next = sq->cblist;
|
|
sq->cblist = cb;
|
|
return sq;
|
|
}
|
|
|
|
/** remove callback from list */
|
|
static void
|
|
callback_list_remove(struct serviced_query* sq, void* cb_arg)
|
|
{
|
|
struct service_callback** pp = &sq->cblist;
|
|
while(*pp) {
|
|
if((*pp)->cb_arg == cb_arg) {
|
|
struct service_callback* del = *pp;
|
|
*pp = del->next;
|
|
free(del);
|
|
return;
|
|
}
|
|
pp = &(*pp)->next;
|
|
}
|
|
}
|
|
|
|
void outnet_serviced_query_stop(struct serviced_query* sq, void* cb_arg)
|
|
{
|
|
if(!sq)
|
|
return;
|
|
callback_list_remove(sq, cb_arg);
|
|
/* if callbacks() routine scheduled deletion, let it do that */
|
|
if(!sq->cblist && !sq->to_be_deleted) {
|
|
#ifdef UNBOUND_DEBUG
|
|
rbnode_t* rem =
|
|
#else
|
|
(void)
|
|
#endif
|
|
rbtree_delete(sq->outnet->serviced, sq);
|
|
log_assert(rem); /* should be present */
|
|
serviced_delete(sq);
|
|
}
|
|
}
|
|
|
|
/** get memory used by waiting tcp entry (in use or not) */
|
|
static size_t
|
|
waiting_tcp_get_mem(struct waiting_tcp* w)
|
|
{
|
|
size_t s;
|
|
if(!w) return 0;
|
|
s = sizeof(*w) + w->pkt_len;
|
|
if(w->timer)
|
|
s += comm_timer_get_mem(w->timer);
|
|
return s;
|
|
}
|
|
|
|
/** get memory used by port if */
|
|
static size_t
|
|
if_get_mem(struct port_if* pif)
|
|
{
|
|
size_t s;
|
|
int i;
|
|
s = sizeof(*pif) + sizeof(int)*pif->avail_total +
|
|
sizeof(struct port_comm*)*pif->maxout;
|
|
for(i=0; i<pif->inuse; i++)
|
|
s += sizeof(*pif->out[i]) +
|
|
comm_point_get_mem(pif->out[i]->cp);
|
|
return s;
|
|
}
|
|
|
|
/** get memory used by waiting udp */
|
|
static size_t
|
|
waiting_udp_get_mem(struct pending* w)
|
|
{
|
|
size_t s;
|
|
s = sizeof(*w) + comm_timer_get_mem(w->timer) + w->pkt_len;
|
|
return s;
|
|
}
|
|
|
|
size_t outnet_get_mem(struct outside_network* outnet)
|
|
{
|
|
size_t i;
|
|
int k;
|
|
struct waiting_tcp* w;
|
|
struct pending* u;
|
|
struct serviced_query* sq;
|
|
struct service_callback* sb;
|
|
struct port_comm* pc;
|
|
size_t s = sizeof(*outnet) + sizeof(*outnet->base) +
|
|
sizeof(*outnet->udp_buff) +
|
|
sldns_buffer_capacity(outnet->udp_buff);
|
|
/* second buffer is not ours */
|
|
for(pc = outnet->unused_fds; pc; pc = pc->next) {
|
|
s += sizeof(*pc) + comm_point_get_mem(pc->cp);
|
|
}
|
|
for(k=0; k<outnet->num_ip4; k++)
|
|
s += if_get_mem(&outnet->ip4_ifs[k]);
|
|
for(k=0; k<outnet->num_ip6; k++)
|
|
s += if_get_mem(&outnet->ip6_ifs[k]);
|
|
for(u=outnet->udp_wait_first; u; u=u->next_waiting)
|
|
s += waiting_udp_get_mem(u);
|
|
|
|
s += sizeof(struct pending_tcp*)*outnet->num_tcp;
|
|
for(i=0; i<outnet->num_tcp; i++) {
|
|
s += sizeof(struct pending_tcp);
|
|
s += comm_point_get_mem(outnet->tcp_conns[i]->c);
|
|
if(outnet->tcp_conns[i]->query)
|
|
s += waiting_tcp_get_mem(outnet->tcp_conns[i]->query);
|
|
}
|
|
for(w=outnet->tcp_wait_first; w; w = w->next_waiting)
|
|
s += waiting_tcp_get_mem(w);
|
|
s += sizeof(*outnet->pending);
|
|
s += (sizeof(struct pending) + comm_timer_get_mem(NULL)) *
|
|
outnet->pending->count;
|
|
s += sizeof(*outnet->serviced);
|
|
s += outnet->svcd_overhead;
|
|
RBTREE_FOR(sq, struct serviced_query*, outnet->serviced) {
|
|
s += sizeof(*sq) + sq->qbuflen;
|
|
for(sb = sq->cblist; sb; sb = sb->next)
|
|
s += sizeof(*sb);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
size_t
|
|
serviced_get_mem(struct serviced_query* sq)
|
|
{
|
|
struct service_callback* sb;
|
|
size_t s;
|
|
s = sizeof(*sq) + sq->qbuflen;
|
|
for(sb = sq->cblist; sb; sb = sb->next)
|
|
s += sizeof(*sb);
|
|
if(sq->status == serviced_query_UDP_EDNS ||
|
|
sq->status == serviced_query_UDP ||
|
|
sq->status == serviced_query_PROBE_EDNS ||
|
|
sq->status == serviced_query_UDP_EDNS_FRAG ||
|
|
sq->status == serviced_query_UDP_EDNS_fallback) {
|
|
s += sizeof(struct pending);
|
|
s += comm_timer_get_mem(NULL);
|
|
} else {
|
|
/* does not have size of the pkt pointer */
|
|
/* always has a timer except on malloc failures */
|
|
|
|
/* these sizes are part of the main outside network mem */
|
|
/*
|
|
s += sizeof(struct waiting_tcp);
|
|
s += comm_timer_get_mem(NULL);
|
|
*/
|
|
}
|
|
return s;
|
|
}
|
|
|