2 * services/outside_network.c - implement sending of queries and wait answer.
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
6 * This software is open source.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 * This file has functions to send queries to authoritative servers and
40 * wait for the pending answer events.
44 #ifdef HAVE_SYS_TYPES_H
45 # include <sys/types.h>
48 #include "services/outside_network.h"
49 #include "services/listen_dnsport.h"
50 #include "services/cache/infra.h"
51 #include "iterator/iterator.h"
52 #include "util/data/msgparse.h"
53 #include "util/data/msgreply.h"
54 #include "util/data/msgencode.h"
55 #include "util/data/dname.h"
56 #include "util/netevent.h"
58 #include "util/net_help.h"
59 #include "util/random.h"
60 #include "util/fptr_wlist.h"
61 #include "sldns/sbuffer.h"
62 #include "dnstap/dnstap.h"
63 #ifdef HAVE_OPENSSL_SSL_H
64 #include <openssl/ssl.h>
66 #ifdef HAVE_X509_VERIFY_PARAM_SET1_HOST
67 #include <openssl/x509v3.h>
75 /** number of times to retry making a random ID that is unique. */
76 #define MAX_ID_RETRY 1000
77 /** number of times to retry finding interface, port that can be opened. */
78 #define MAX_PORT_RETRY 10000
79 /** number of retries on outgoing UDP queries */
80 #define OUTBOUND_UDP_RETRY 1
82 /** initiate TCP transaction for serviced query */
83 static void serviced_tcp_initiate(struct serviced_query* sq, sldns_buffer* buff);
84 /** with a fd available, randomize and send UDP */
85 static int randomize_and_send_udp(struct pending* pend, sldns_buffer* packet,
88 /** remove waiting tcp from the outnet waiting list */
89 static void waiting_list_remove(struct outside_network* outnet,
90 struct waiting_tcp* w);
93 pending_cmp(const void* key1, const void* key2)
95 struct pending *p1 = (struct pending*)key1;
96 struct pending *p2 = (struct pending*)key2;
101 log_assert(p1->id == p2->id);
102 return sockaddr_cmp(&p1->addr, p1->addrlen, &p2->addr, p2->addrlen);
106 serviced_cmp(const void* key1, const void* key2)
108 struct serviced_query* q1 = (struct serviced_query*)key1;
109 struct serviced_query* q2 = (struct serviced_query*)key2;
111 if(q1->qbuflen < q2->qbuflen)
113 if(q1->qbuflen > q2->qbuflen)
115 log_assert(q1->qbuflen == q2->qbuflen);
116 log_assert(q1->qbuflen >= 15 /* 10 header, root, type, class */);
117 /* alternate casing of qname is still the same query */
118 if((r = memcmp(q1->qbuf, q2->qbuf, 10)) != 0)
120 if((r = memcmp(q1->qbuf+q1->qbuflen-4, q2->qbuf+q2->qbuflen-4, 4)) != 0)
122 if(q1->dnssec != q2->dnssec) {
123 if(q1->dnssec < q2->dnssec)
127 if((r = query_dname_compare(q1->qbuf+10, q2->qbuf+10)) != 0)
129 if((r = edns_opt_list_compare(q1->opt_list, q2->opt_list)) != 0)
131 return sockaddr_cmp(&q1->addr, q1->addrlen, &q2->addr, q2->addrlen);
134 /** delete waiting_tcp entry. Does not unlink from waiting list.
135 * @param w: to delete.
138 waiting_tcp_delete(struct waiting_tcp* w)
142 comm_timer_delete(w->timer);
147 * Pick random outgoing-interface of that family, and bind it.
148 * port set to 0 so OS picks a port number for us.
149 * if it is the ANY address, do not bind.
150 * @param w: tcp structure with destination address.
151 * @param s: socket fd.
152 * @return false on error, socket closed.
155 pick_outgoing_tcp(struct waiting_tcp* w, int s)
157 struct port_if* pi = NULL;
160 if(addr_is_ip6(&w->addr, w->addrlen))
161 num = w->outnet->num_ip6;
164 num = w->outnet->num_ip4;
166 log_err("no TCP outgoing interfaces of family");
167 log_addr(VERB_OPS, "for addr", &w->addr, w->addrlen);
176 if(addr_is_ip6(&w->addr, w->addrlen))
177 pi = &w->outnet->ip6_ifs[ub_random_max(w->outnet->rnd, num)];
180 pi = &w->outnet->ip4_ifs[ub_random_max(w->outnet->rnd, num)];
182 if(addr_is_any(&pi->addr, pi->addrlen)) {
183 /* binding to the ANY interface is for listening sockets */
187 if(addr_is_ip6(&pi->addr, pi->addrlen))
188 ((struct sockaddr_in6*)&pi->addr)->sin6_port = 0;
189 else ((struct sockaddr_in*)&pi->addr)->sin_port = 0;
190 if(bind(s, (struct sockaddr*)&pi->addr, pi->addrlen) != 0) {
192 log_err("outgoing tcp: bind: %s", strerror(errno));
195 log_err("outgoing tcp: bind: %s",
196 wsa_strerror(WSAGetLastError()));
201 log_addr(VERB_ALGO, "tcp bound to src", &pi->addr, pi->addrlen);
205 /** get TCP file descriptor for address, returns -1 on failure,
206 * tcp_mss is 0 or maxseg size to set for TCP packets. */
208 outnet_get_tcp_fd(struct sockaddr_storage* addr, socklen_t addrlen, int tcp_mss)
215 if(addr_is_ip6(addr, addrlen))
216 s = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP);
219 s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
222 log_err_addr("outgoing tcp: socket", strerror(errno),
225 log_err_addr("outgoing tcp: socket",
226 wsa_strerror(WSAGetLastError()), addr, addrlen);
232 if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*)&on,
233 (socklen_t)sizeof(on)) < 0) {
234 verbose(VERB_ALGO, "outgoing tcp:"
235 " setsockopt(.. SO_REUSEADDR ..) failed");
240 #if defined(IPPROTO_TCP) && defined(TCP_MAXSEG)
241 if(setsockopt(s, IPPROTO_TCP, TCP_MAXSEG,
242 (void*)&tcp_mss, (socklen_t)sizeof(tcp_mss)) < 0) {
243 verbose(VERB_ALGO, "outgoing tcp:"
244 " setsockopt(.. TCP_MAXSEG ..) failed");
247 verbose(VERB_ALGO, "outgoing tcp:"
248 " setsockopt(TCP_MAXSEG) unsupported");
249 #endif /* defined(IPPROTO_TCP) && defined(TCP_MAXSEG) */
255 /** connect tcp connection to addr, 0 on failure */
257 outnet_tcp_connect(int s, struct sockaddr_storage* addr, socklen_t addrlen)
259 if(connect(s, (struct sockaddr*)addr, addrlen) == -1) {
262 if(errno != EINPROGRESS) {
264 if(tcp_connect_errno_needs_log(
265 (struct sockaddr*)addr, addrlen))
266 log_err_addr("outgoing tcp: connect",
267 strerror(errno), addr, addrlen);
273 #else /* USE_WINSOCK */
274 if(WSAGetLastError() != WSAEINPROGRESS &&
275 WSAGetLastError() != WSAEWOULDBLOCK) {
284 /** use next free buffer to service a tcp query */
286 outnet_tcp_take_into_use(struct waiting_tcp* w, uint8_t* pkt, size_t pkt_len)
288 struct pending_tcp* pend = w->outnet->tcp_free;
292 log_assert(w->addrlen > 0);
294 s = outnet_get_tcp_fd(&w->addr, w->addrlen, w->outnet->tcp_mss);
299 if(!pick_outgoing_tcp(w, s))
303 #ifdef USE_OSX_MSG_FASTOPEN
304 /* API for fast open is different here. We use a connectx() function and
305 then writes can happen as normal even using SSL.*/
306 /* connectx requires that the len be set in the sockaddr struct*/
307 struct sockaddr_in *addr_in = (struct sockaddr_in *)&w->addr;
308 addr_in->sin_len = w->addrlen;
309 sa_endpoints_t endpoints;
310 endpoints.sae_srcif = 0;
311 endpoints.sae_srcaddr = NULL;
312 endpoints.sae_srcaddrlen = 0;
313 endpoints.sae_dstaddr = (struct sockaddr *)&w->addr;
314 endpoints.sae_dstaddrlen = w->addrlen;
315 if (connectx(s, &endpoints, SAE_ASSOCID_ANY,
316 CONNECT_DATA_IDEMPOTENT | CONNECT_RESUME_ON_READ_WRITE,
317 NULL, 0, NULL, NULL) == -1) {
318 /* if fails, failover to connect for OSX 10.10 */
320 if(errno != EINPROGRESS) {
324 if(connect(s, (struct sockaddr*)&w->addr, w->addrlen) == -1) {
325 #else /* USE_OSX_MSG_FASTOPEN*/
326 #ifdef USE_MSG_FASTOPEN
327 pend->c->tcp_do_fastopen = 1;
328 /* Only do TFO for TCP in which case no connect() is required here.
329 Don't combine client TFO with SSL, since OpenSSL can't
330 currently support doing a handshake on fd that already isn't connected*/
331 if (w->outnet->sslctx && w->ssl_upstream) {
332 if(connect(s, (struct sockaddr*)&w->addr, w->addrlen) == -1) {
333 #else /* USE_MSG_FASTOPEN*/
334 if(connect(s, (struct sockaddr*)&w->addr, w->addrlen) == -1) {
335 #endif /* USE_MSG_FASTOPEN*/
336 #endif /* USE_OSX_MSG_FASTOPEN*/
339 if(errno != EINPROGRESS) {
343 if(tcp_connect_errno_needs_log(
344 (struct sockaddr*)&w->addr, w->addrlen))
345 log_err_addr("outgoing tcp: connect",
346 strerror(errno), &w->addr, w->addrlen);
348 #else /* USE_WINSOCK */
349 if(WSAGetLastError() != WSAEINPROGRESS &&
350 WSAGetLastError() != WSAEWOULDBLOCK) {
356 #ifdef USE_MSG_FASTOPEN
358 #endif /* USE_MSG_FASTOPEN */
359 #ifdef USE_OSX_MSG_FASTOPEN
362 #endif /* USE_OSX_MSG_FASTOPEN */
363 if(w->outnet->sslctx && w->ssl_upstream) {
364 pend->c->ssl = outgoing_ssl_fd(w->outnet->sslctx, s);
367 comm_point_close(pend->c);
370 verbose(VERB_ALGO, "the query is using TLS encryption, for %s",
371 (w->tls_auth_name?w->tls_auth_name:"an unauthenticated connection"));
373 comm_point_tcp_win_bio_cb(pend->c, pend->c->ssl);
375 pend->c->ssl_shake_state = comm_ssl_shake_write;
376 if(w->tls_auth_name) {
378 (void)SSL_set_tlsext_host_name(pend->c->ssl, w->tls_auth_name);
381 #ifdef HAVE_SSL_SET1_HOST
382 if(w->tls_auth_name) {
383 SSL_set_verify(pend->c->ssl, SSL_VERIFY_PEER, NULL);
384 /* setting the hostname makes openssl verify the
385 * host name in the x509 certificate in the
387 if(!SSL_set1_host(pend->c->ssl, w->tls_auth_name)) {
388 log_err("SSL_set1_host failed");
390 SSL_free(pend->c->ssl);
392 comm_point_close(pend->c);
396 #elif defined(HAVE_X509_VERIFY_PARAM_SET1_HOST)
397 /* openssl 1.0.2 has this function that can be used for
398 * set1_host like verification */
399 if(w->tls_auth_name) {
400 X509_VERIFY_PARAM* param = SSL_get0_param(pend->c->ssl);
401 X509_VERIFY_PARAM_set_hostflags(param, X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS);
402 if(!X509_VERIFY_PARAM_set1_host(param, w->tls_auth_name, strlen(w->tls_auth_name))) {
403 log_err("X509_VERIFY_PARAM_set1_host failed");
405 SSL_free(pend->c->ssl);
407 comm_point_close(pend->c);
410 SSL_set_verify(pend->c->ssl, SSL_VERIFY_PEER, NULL);
413 verbose(VERB_ALGO, "the query has an auth_name, but libssl has no call to perform TLS authentication");
414 #endif /* HAVE_SSL_SET1_HOST */
417 w->next_waiting = (void*)pend;
418 pend->id = LDNS_ID_WIRE(pkt);
419 w->outnet->num_tcp_outgoing++;
420 w->outnet->tcp_free = pend->next_free;
421 pend->next_free = NULL;
423 pend->c->repinfo.addrlen = w->addrlen;
424 memcpy(&pend->c->repinfo.addr, &w->addr, w->addrlen);
425 sldns_buffer_clear(pend->c->buffer);
426 sldns_buffer_write(pend->c->buffer, pkt, pkt_len);
427 sldns_buffer_flip(pend->c->buffer);
428 pend->c->tcp_is_reading = 0;
429 pend->c->tcp_byte_count = 0;
430 comm_point_start_listening(pend->c, s, -1);
434 /** see if buffers can be used to service TCP queries */
436 use_free_buffer(struct outside_network* outnet)
438 struct waiting_tcp* w;
439 while(outnet->tcp_free && outnet->tcp_wait_first
440 && !outnet->want_to_quit) {
441 w = outnet->tcp_wait_first;
442 outnet->tcp_wait_first = w->next_waiting;
443 if(outnet->tcp_wait_last == w)
444 outnet->tcp_wait_last = NULL;
445 if(!outnet_tcp_take_into_use(w, w->pkt, w->pkt_len)) {
446 comm_point_callback_type* cb = w->cb;
447 void* cb_arg = w->cb_arg;
448 waiting_tcp_delete(w);
449 fptr_ok(fptr_whitelist_pending_tcp(cb));
450 (void)(*cb)(NULL, cb_arg, NETEVENT_CLOSED, NULL);
455 /** decommission a tcp buffer, closes commpoint and frees waiting_tcp entry */
457 decommission_pending_tcp(struct outside_network* outnet,
458 struct pending_tcp* pend)
462 SSL_shutdown(pend->c->ssl);
463 SSL_free(pend->c->ssl);
467 comm_point_close(pend->c);
468 pend->next_free = outnet->tcp_free;
469 outnet->tcp_free = pend;
470 waiting_tcp_delete(pend->query);
472 use_free_buffer(outnet);
476 outnet_tcp_cb(struct comm_point* c, void* arg, int error,
477 struct comm_reply *reply_info)
479 struct pending_tcp* pend = (struct pending_tcp*)arg;
480 struct outside_network* outnet = pend->query->outnet;
481 verbose(VERB_ALGO, "outnettcp cb");
482 if(error != NETEVENT_NOERROR) {
483 verbose(VERB_QUERY, "outnettcp got tcp error %d", error);
484 /* pass error below and exit */
487 if(sldns_buffer_limit(c->buffer) < sizeof(uint16_t) ||
488 LDNS_ID_WIRE(sldns_buffer_begin(c->buffer))!=pend->id) {
490 "outnettcp: bad ID in reply, from:",
491 &pend->query->addr, pend->query->addrlen);
492 error = NETEVENT_CLOSED;
495 fptr_ok(fptr_whitelist_pending_tcp(pend->query->cb));
496 (void)(*pend->query->cb)(c, pend->query->cb_arg, error, reply_info);
497 decommission_pending_tcp(outnet, pend);
501 /** lower use count on pc, see if it can be closed */
503 portcomm_loweruse(struct outside_network* outnet, struct port_comm* pc)
506 pc->num_outstanding--;
507 if(pc->num_outstanding > 0) {
510 /* close it and replace in unused list */
511 verbose(VERB_ALGO, "close of port %d", pc->number);
512 comm_point_close(pc->cp);
514 log_assert(pif->inuse > 0);
515 pif->avail_ports[pif->avail_total - pif->inuse] = pc->number;
517 pif->out[pc->index] = pif->out[pif->inuse];
518 pif->out[pc->index]->index = pc->index;
519 pc->next = outnet->unused_fds;
520 outnet->unused_fds = pc;
523 /** try to send waiting UDP queries */
525 outnet_send_wait_udp(struct outside_network* outnet)
527 struct pending* pend;
528 /* process waiting queries */
529 while(outnet->udp_wait_first && outnet->unused_fds
530 && !outnet->want_to_quit) {
531 pend = outnet->udp_wait_first;
532 outnet->udp_wait_first = pend->next_waiting;
533 if(!pend->next_waiting) outnet->udp_wait_last = NULL;
534 sldns_buffer_clear(outnet->udp_buff);
535 sldns_buffer_write(outnet->udp_buff, pend->pkt, pend->pkt_len);
536 sldns_buffer_flip(outnet->udp_buff);
537 free(pend->pkt); /* freeing now makes get_mem correct */
540 if(!randomize_and_send_udp(pend, outnet->udp_buff,
542 /* callback error on pending */
544 fptr_ok(fptr_whitelist_pending_udp(pend->cb));
545 (void)(*pend->cb)(outnet->unused_fds->cp, pend->cb_arg,
546 NETEVENT_CLOSED, NULL);
548 pending_delete(outnet, pend);
554 outnet_udp_cb(struct comm_point* c, void* arg, int error,
555 struct comm_reply *reply_info)
557 struct outside_network* outnet = (struct outside_network*)arg;
560 verbose(VERB_ALGO, "answer cb");
562 if(error != NETEVENT_NOERROR) {
563 verbose(VERB_QUERY, "outnetudp got udp error %d", error);
566 if(sldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) {
567 verbose(VERB_QUERY, "outnetudp udp too short");
570 log_assert(reply_info);
572 /* setup lookup key */
573 key.id = (unsigned)LDNS_ID_WIRE(sldns_buffer_begin(c->buffer));
574 memcpy(&key.addr, &reply_info->addr, reply_info->addrlen);
575 key.addrlen = reply_info->addrlen;
576 verbose(VERB_ALGO, "Incoming reply id = %4.4x", key.id);
577 log_addr(VERB_ALGO, "Incoming reply addr =",
578 &reply_info->addr, reply_info->addrlen);
580 /* find it, see if this thing is a valid query response */
581 verbose(VERB_ALGO, "lookup size is %d entries", (int)outnet->pending->count);
582 p = (struct pending*)rbtree_search(outnet->pending, &key);
584 verbose(VERB_QUERY, "received unwanted or unsolicited udp reply dropped.");
585 log_buf(VERB_ALGO, "dropped message", c->buffer);
586 outnet->unwanted_replies++;
587 if(outnet->unwanted_threshold && ++outnet->unwanted_total
588 >= outnet->unwanted_threshold) {
589 log_warn("unwanted reply total reached threshold (%u)"
590 " you may be under attack."
591 " defensive action: clearing the cache",
592 (unsigned)outnet->unwanted_threshold);
593 fptr_ok(fptr_whitelist_alloc_cleanup(
594 outnet->unwanted_action));
595 (*outnet->unwanted_action)(outnet->unwanted_param);
596 outnet->unwanted_total = 0;
601 verbose(VERB_ALGO, "received udp reply.");
602 log_buf(VERB_ALGO, "udp message", c->buffer);
604 verbose(VERB_QUERY, "received reply id,addr on wrong port. "
606 outnet->unwanted_replies++;
607 if(outnet->unwanted_threshold && ++outnet->unwanted_total
608 >= outnet->unwanted_threshold) {
609 log_warn("unwanted reply total reached threshold (%u)"
610 " you may be under attack."
611 " defensive action: clearing the cache",
612 (unsigned)outnet->unwanted_threshold);
613 fptr_ok(fptr_whitelist_alloc_cleanup(
614 outnet->unwanted_action));
615 (*outnet->unwanted_action)(outnet->unwanted_param);
616 outnet->unwanted_total = 0;
620 comm_timer_disable(p->timer);
621 verbose(VERB_ALGO, "outnet handle udp reply");
622 /* delete from tree first in case callback creates a retry */
623 (void)rbtree_delete(outnet->pending, p->node.key);
625 fptr_ok(fptr_whitelist_pending_udp(p->cb));
626 (void)(*p->cb)(p->pc->cp, p->cb_arg, NETEVENT_NOERROR, reply_info);
628 portcomm_loweruse(outnet, p->pc);
629 pending_delete(NULL, p);
630 outnet_send_wait_udp(outnet);
634 /** calculate number of ip4 and ip6 interfaces*/
636 calc_num46(char** ifs, int num_ifs, int do_ip4, int do_ip6,
637 int* num_ip4, int* num_ip6)
649 for(i=0; i<num_ifs; i++)
651 if(str_is_ip6(ifs[i])) {
663 pending_udp_timer_delay_cb(void* arg)
665 struct pending* p = (struct pending*)arg;
666 struct outside_network* outnet = p->outnet;
667 verbose(VERB_ALGO, "timeout udp with delay");
668 portcomm_loweruse(outnet, p->pc);
669 pending_delete(outnet, p);
670 outnet_send_wait_udp(outnet);
674 pending_udp_timer_cb(void *arg)
676 struct pending* p = (struct pending*)arg;
677 struct outside_network* outnet = p->outnet;
679 verbose(VERB_ALGO, "timeout udp");
681 fptr_ok(fptr_whitelist_pending_udp(p->cb));
682 (void)(*p->cb)(p->pc->cp, p->cb_arg, NETEVENT_TIMEOUT, NULL);
684 /* if delayclose, keep port open for a longer time.
685 * But if the udpwaitlist exists, then we are struggling to
686 * keep up with demand for sockets, so do not wait, but service
687 * the customer (customer service more important than portICMPs) */
688 if(outnet->delayclose && !outnet->udp_wait_first) {
690 p->timer->callback = &pending_udp_timer_delay_cb;
691 comm_timer_set(p->timer, &outnet->delay_tv);
694 portcomm_loweruse(outnet, p->pc);
695 pending_delete(outnet, p);
696 outnet_send_wait_udp(outnet);
699 /** create pending_tcp buffers */
701 create_pending_tcp(struct outside_network* outnet, size_t bufsize)
704 if(outnet->num_tcp == 0)
705 return 1; /* no tcp needed, nothing to do */
706 if(!(outnet->tcp_conns = (struct pending_tcp **)calloc(
707 outnet->num_tcp, sizeof(struct pending_tcp*))))
709 for(i=0; i<outnet->num_tcp; i++) {
710 if(!(outnet->tcp_conns[i] = (struct pending_tcp*)calloc(1,
711 sizeof(struct pending_tcp))))
713 outnet->tcp_conns[i]->next_free = outnet->tcp_free;
714 outnet->tcp_free = outnet->tcp_conns[i];
715 outnet->tcp_conns[i]->c = comm_point_create_tcp_out(
716 outnet->base, bufsize, outnet_tcp_cb,
717 outnet->tcp_conns[i]);
718 if(!outnet->tcp_conns[i]->c)
724 /** setup an outgoing interface, ready address */
725 static int setup_if(struct port_if* pif, const char* addrstr,
726 int* avail, int numavail, size_t numfd)
728 pif->avail_total = numavail;
729 pif->avail_ports = (int*)memdup(avail, (size_t)numavail*sizeof(int));
730 if(!pif->avail_ports)
732 if(!ipstrtoaddr(addrstr, UNBOUND_DNS_PORT, &pif->addr, &pif->addrlen) &&
733 !netblockstrtoaddr(addrstr, UNBOUND_DNS_PORT,
734 &pif->addr, &pif->addrlen, &pif->pfxlen))
736 pif->maxout = (int)numfd;
738 pif->out = (struct port_comm**)calloc(numfd,
739 sizeof(struct port_comm*));
745 struct outside_network*
746 outside_network_create(struct comm_base *base, size_t bufsize,
747 size_t num_ports, char** ifs, int num_ifs, int do_ip4,
748 int do_ip6, size_t num_tcp, struct infra_cache* infra,
749 struct ub_randstate* rnd, int use_caps_for_id, int* availports,
750 int numavailports, size_t unwanted_threshold, int tcp_mss,
751 void (*unwanted_action)(void*), void* unwanted_param, int do_udp,
752 void* sslctx, int delayclose, struct dt_env* dtenv)
754 struct outside_network* outnet = (struct outside_network*)
755 calloc(1, sizeof(struct outside_network));
758 log_err("malloc failed");
761 comm_base_timept(base, &outnet->now_secs, &outnet->now_tv);
763 outnet->num_tcp = num_tcp;
764 outnet->num_tcp_outgoing = 0;
765 outnet->infra = infra;
767 outnet->sslctx = sslctx;
769 outnet->dtenv = dtenv;
773 outnet->svcd_overhead = 0;
774 outnet->want_to_quit = 0;
775 outnet->unwanted_threshold = unwanted_threshold;
776 outnet->unwanted_action = unwanted_action;
777 outnet->unwanted_param = unwanted_param;
778 outnet->use_caps_for_id = use_caps_for_id;
779 outnet->do_udp = do_udp;
780 outnet->tcp_mss = tcp_mss;
783 outnet->delayclose = 1;
784 outnet->delay_tv.tv_sec = delayclose/1000;
785 outnet->delay_tv.tv_usec = (delayclose%1000)*1000;
788 if(numavailports == 0 || num_ports == 0) {
789 log_err("no outgoing ports available");
790 outside_network_delete(outnet);
796 calc_num46(ifs, num_ifs, do_ip4, do_ip6,
797 &outnet->num_ip4, &outnet->num_ip6);
798 if(outnet->num_ip4 != 0) {
799 if(!(outnet->ip4_ifs = (struct port_if*)calloc(
800 (size_t)outnet->num_ip4, sizeof(struct port_if)))) {
801 log_err("malloc failed");
802 outside_network_delete(outnet);
806 if(outnet->num_ip6 != 0) {
807 if(!(outnet->ip6_ifs = (struct port_if*)calloc(
808 (size_t)outnet->num_ip6, sizeof(struct port_if)))) {
809 log_err("malloc failed");
810 outside_network_delete(outnet);
814 if( !(outnet->udp_buff = sldns_buffer_new(bufsize)) ||
815 !(outnet->pending = rbtree_create(pending_cmp)) ||
816 !(outnet->serviced = rbtree_create(serviced_cmp)) ||
817 !create_pending_tcp(outnet, bufsize)) {
818 log_err("malloc failed");
819 outside_network_delete(outnet);
823 /* allocate commpoints */
824 for(k=0; k<num_ports; k++) {
825 struct port_comm* pc;
826 pc = (struct port_comm*)calloc(1, sizeof(*pc));
828 log_err("malloc failed");
829 outside_network_delete(outnet);
832 pc->cp = comm_point_create_udp(outnet->base, -1,
833 outnet->udp_buff, outnet_udp_cb, outnet);
835 log_err("malloc failed");
837 outside_network_delete(outnet);
840 pc->next = outnet->unused_fds;
841 outnet->unused_fds = pc;
844 /* allocate interfaces */
846 if(do_ip4 && !setup_if(&outnet->ip4_ifs[0], "0.0.0.0",
847 availports, numavailports, num_ports)) {
848 log_err("malloc failed");
849 outside_network_delete(outnet);
852 if(do_ip6 && !setup_if(&outnet->ip6_ifs[0], "::",
853 availports, numavailports, num_ports)) {
854 log_err("malloc failed");
855 outside_network_delete(outnet);
859 size_t done_4 = 0, done_6 = 0;
861 for(i=0; i<num_ifs; i++) {
862 if(str_is_ip6(ifs[i]) && do_ip6) {
863 if(!setup_if(&outnet->ip6_ifs[done_6], ifs[i],
864 availports, numavailports, num_ports)){
865 log_err("malloc failed");
866 outside_network_delete(outnet);
871 if(!str_is_ip6(ifs[i]) && do_ip4) {
872 if(!setup_if(&outnet->ip4_ifs[done_4], ifs[i],
873 availports, numavailports, num_ports)){
874 log_err("malloc failed");
875 outside_network_delete(outnet);
885 /** helper pending delete */
887 pending_node_del(rbnode_type* node, void* arg)
889 struct pending* pend = (struct pending*)node;
890 struct outside_network* outnet = (struct outside_network*)arg;
891 pending_delete(outnet, pend);
894 /** helper serviced delete */
896 serviced_node_del(rbnode_type* node, void* ATTR_UNUSED(arg))
898 struct serviced_query* sq = (struct serviced_query*)node;
899 struct service_callback* p = sq->cblist, *np;
902 free(sq->tls_auth_name);
903 edns_opt_list_free(sq->opt_list);
913 outside_network_quit_prepare(struct outside_network* outnet)
917 /* prevent queued items from being sent */
918 outnet->want_to_quit = 1;
922 outside_network_delete(struct outside_network* outnet)
926 outnet->want_to_quit = 1;
927 /* check every element, since we can be called on malloc error */
928 if(outnet->pending) {
929 /* free pending elements, but do no unlink from tree. */
930 traverse_postorder(outnet->pending, pending_node_del, NULL);
931 free(outnet->pending);
933 if(outnet->serviced) {
934 traverse_postorder(outnet->serviced, serviced_node_del, NULL);
935 free(outnet->serviced);
938 sldns_buffer_free(outnet->udp_buff);
939 if(outnet->unused_fds) {
940 struct port_comm* p = outnet->unused_fds, *np;
943 comm_point_delete(p->cp);
947 outnet->unused_fds = NULL;
949 if(outnet->ip4_ifs) {
951 for(i=0; i<outnet->num_ip4; i++) {
952 for(k=0; k<outnet->ip4_ifs[i].inuse; k++) {
953 struct port_comm* pc = outnet->ip4_ifs[i].
955 comm_point_delete(pc->cp);
958 free(outnet->ip4_ifs[i].avail_ports);
959 free(outnet->ip4_ifs[i].out);
961 free(outnet->ip4_ifs);
963 if(outnet->ip6_ifs) {
965 for(i=0; i<outnet->num_ip6; i++) {
966 for(k=0; k<outnet->ip6_ifs[i].inuse; k++) {
967 struct port_comm* pc = outnet->ip6_ifs[i].
969 comm_point_delete(pc->cp);
972 free(outnet->ip6_ifs[i].avail_ports);
973 free(outnet->ip6_ifs[i].out);
975 free(outnet->ip6_ifs);
977 if(outnet->tcp_conns) {
979 for(i=0; i<outnet->num_tcp; i++)
980 if(outnet->tcp_conns[i]) {
981 comm_point_delete(outnet->tcp_conns[i]->c);
982 waiting_tcp_delete(outnet->tcp_conns[i]->query);
983 free(outnet->tcp_conns[i]);
985 free(outnet->tcp_conns);
987 if(outnet->tcp_wait_first) {
988 struct waiting_tcp* p = outnet->tcp_wait_first, *np;
990 np = p->next_waiting;
991 waiting_tcp_delete(p);
995 if(outnet->udp_wait_first) {
996 struct pending* p = outnet->udp_wait_first, *np;
998 np = p->next_waiting;
999 pending_delete(NULL, p);
1007 pending_delete(struct outside_network* outnet, struct pending* p)
1011 if(outnet && outnet->udp_wait_first &&
1012 (p->next_waiting || p == outnet->udp_wait_last) ) {
1013 /* delete from waiting list, if it is in the waiting list */
1014 struct pending* prev = NULL, *x = outnet->udp_wait_first;
1015 while(x && x != p) {
1017 x = x->next_waiting;
1022 prev->next_waiting = p->next_waiting;
1023 else outnet->udp_wait_first = p->next_waiting;
1024 if(outnet->udp_wait_last == p)
1025 outnet->udp_wait_last = prev;
1029 (void)rbtree_delete(outnet->pending, p->node.key);
1032 comm_timer_delete(p->timer);
1038 sai6_putrandom(struct sockaddr_in6 *sa, int pfxlen, struct ub_randstate *rnd)
1041 if(!(pfxlen > 0 && pfxlen < 128))
1043 for(i = 0; i < (128 - pfxlen) / 8; i++) {
1044 sa->sin6_addr.s6_addr[15-i] = (uint8_t)ub_random_max(rnd, 256);
1048 sa->sin6_addr.s6_addr[15-i] |=
1049 ((0xFF >> last) & ub_random_max(rnd, 256));
1054 * Try to open a UDP socket for outgoing communication.
1055 * Sets sockets options as needed.
1056 * @param addr: socket address.
1057 * @param addrlen: length of address.
1058 * @param pfxlen: length of network prefix (for address randomisation).
1059 * @param port: port override for addr.
1060 * @param inuse: if -1 is returned, this bool means the port was in use.
1061 * @param rnd: random state (for address randomisation).
1065 udp_sockport(struct sockaddr_storage* addr, socklen_t addrlen, int pfxlen,
1066 int port, int* inuse, struct ub_randstate* rnd)
1069 if(addr_is_ip6(addr, addrlen)) {
1071 struct sockaddr_in6 sa = *(struct sockaddr_in6*)addr;
1072 sa.sin6_port = (in_port_t)htons((uint16_t)port);
1073 sa.sin6_flowinfo = 0;
1074 sa.sin6_scope_id = 0;
1077 sai6_putrandom(&sa, pfxlen, rnd);
1079 fd = create_udp_sock(AF_INET6, SOCK_DGRAM,
1080 (struct sockaddr*)&sa, addrlen, 1, inuse, &noproto,
1081 0, 0, 0, NULL, 0, freebind, 0);
1083 struct sockaddr_in* sa = (struct sockaddr_in*)addr;
1084 sa->sin_port = (in_port_t)htons((uint16_t)port);
1085 fd = create_udp_sock(AF_INET, SOCK_DGRAM,
1086 (struct sockaddr*)addr, addrlen, 1, inuse, &noproto,
1087 0, 0, 0, NULL, 0, 0, 0);
1092 /** Select random ID */
1094 select_id(struct outside_network* outnet, struct pending* pend,
1095 sldns_buffer* packet)
1098 pend->id = ((unsigned)ub_random(outnet->rnd)>>8) & 0xffff;
1099 LDNS_ID_SET(sldns_buffer_begin(packet), pend->id);
1101 /* insert in tree */
1102 pend->node.key = pend;
1103 while(!rbtree_insert(outnet->pending, &pend->node)) {
1104 /* change ID to avoid collision */
1105 pend->id = ((unsigned)ub_random(outnet->rnd)>>8) & 0xffff;
1106 LDNS_ID_SET(sldns_buffer_begin(packet), pend->id);
1108 if(id_tries == MAX_ID_RETRY) {
1109 pend->id=99999; /* non existant ID */
1110 log_err("failed to generate unique ID, drop msg");
1114 verbose(VERB_ALGO, "inserted new pending reply id=%4.4x", pend->id);
1118 /** Select random interface and port */
1120 select_ifport(struct outside_network* outnet, struct pending* pend,
1121 int num_if, struct port_if* ifs)
1123 int my_if, my_port, fd, portno, inuse, tries=0;
1124 struct port_if* pif;
1125 /* randomly select interface and port */
1127 verbose(VERB_QUERY, "Need to send query but have no "
1128 "outgoing interfaces of that family");
1131 log_assert(outnet->unused_fds);
1134 my_if = ub_random_max(outnet->rnd, num_if);
1136 my_port = ub_random_max(outnet->rnd, pif->avail_total);
1137 if(my_port < pif->inuse) {
1138 /* port already open */
1139 pend->pc = pif->out[my_port];
1140 verbose(VERB_ALGO, "using UDP if=%d port=%d",
1141 my_if, pend->pc->number);
1144 /* try to open new port, if fails, loop to try again */
1145 log_assert(pif->inuse < pif->maxout);
1146 portno = pif->avail_ports[my_port - pif->inuse];
1147 fd = udp_sockport(&pif->addr, pif->addrlen, pif->pfxlen,
1148 portno, &inuse, outnet->rnd);
1149 if(fd == -1 && !inuse) {
1150 /* nonrecoverable error making socket */
1154 verbose(VERB_ALGO, "opened UDP if=%d port=%d",
1157 pend->pc = outnet->unused_fds;
1158 outnet->unused_fds = pend->pc->next;
1160 /* setup portcomm */
1161 pend->pc->next = NULL;
1162 pend->pc->number = portno;
1163 pend->pc->pif = pif;
1164 pend->pc->index = pif->inuse;
1165 pend->pc->num_outstanding = 0;
1166 comm_point_start_listening(pend->pc->cp, fd, -1);
1168 /* grab port in interface */
1169 pif->out[pif->inuse] = pend->pc;
1170 pif->avail_ports[my_port - pif->inuse] =
1171 pif->avail_ports[pif->avail_total-pif->inuse-1];
1175 /* failed, already in use */
1176 verbose(VERB_QUERY, "port %d in use, trying another", portno);
1178 if(tries == MAX_PORT_RETRY) {
1179 log_err("failed to find an open port, drop msg");
1183 log_assert(pend->pc);
1184 pend->pc->num_outstanding++;
1190 randomize_and_send_udp(struct pending* pend, sldns_buffer* packet, int timeout)
1193 struct outside_network* outnet = pend->sq->outnet;
1196 if(!select_id(outnet, pend, packet)) {
1200 /* select src_if, port */
1201 if(addr_is_ip6(&pend->addr, pend->addrlen)) {
1202 if(!select_ifport(outnet, pend,
1203 outnet->num_ip6, outnet->ip6_ifs))
1206 if(!select_ifport(outnet, pend,
1207 outnet->num_ip4, outnet->ip4_ifs))
1210 log_assert(pend->pc && pend->pc->cp);
1212 /* send it over the commlink */
1213 if(!comm_point_send_udp_msg(pend->pc->cp, packet,
1214 (struct sockaddr*)&pend->addr, pend->addrlen)) {
1215 portcomm_loweruse(outnet, pend->pc);
1219 /* system calls to set timeout after sending UDP to make roundtrip
1222 tv.tv_sec = timeout/1000;
1223 tv.tv_usec = (timeout%1000)*1000;
1225 comm_timer_set(pend->timer, &tv);
1229 (outnet->dtenv->log_resolver_query_messages ||
1230 outnet->dtenv->log_forwarder_query_messages))
1231 dt_msg_send_outside_query(outnet->dtenv, &pend->addr, comm_udp,
1232 pend->sq->zone, pend->sq->zonelen, packet);
1238 pending_udp_query(struct serviced_query* sq, struct sldns_buffer* packet,
1239 int timeout, comm_point_callback_type* cb, void* cb_arg)
1241 struct pending* pend = (struct pending*)calloc(1, sizeof(*pend));
1242 if(!pend) return NULL;
1243 pend->outnet = sq->outnet;
1245 pend->addrlen = sq->addrlen;
1246 memmove(&pend->addr, &sq->addr, sq->addrlen);
1248 pend->cb_arg = cb_arg;
1249 pend->node.key = pend;
1250 pend->timer = comm_timer_create(sq->outnet->base, pending_udp_timer_cb,
1257 if(sq->outnet->unused_fds == NULL) {
1258 /* no unused fd, cannot create a new port (randomly) */
1259 verbose(VERB_ALGO, "no fds available, udp query waiting");
1260 pend->timeout = timeout;
1261 pend->pkt_len = sldns_buffer_limit(packet);
1262 pend->pkt = (uint8_t*)memdup(sldns_buffer_begin(packet),
1265 comm_timer_delete(pend->timer);
1269 /* put at end of waiting list */
1270 if(sq->outnet->udp_wait_last)
1271 sq->outnet->udp_wait_last->next_waiting = pend;
1273 sq->outnet->udp_wait_first = pend;
1274 sq->outnet->udp_wait_last = pend;
1277 if(!randomize_and_send_udp(pend, packet, timeout)) {
1278 pending_delete(sq->outnet, pend);
1285 outnet_tcptimer(void* arg)
1287 struct waiting_tcp* w = (struct waiting_tcp*)arg;
1288 struct outside_network* outnet = w->outnet;
1289 comm_point_callback_type* cb;
1292 /* it is on the waiting list */
1293 waiting_list_remove(outnet, w);
1296 struct pending_tcp* pend=(struct pending_tcp*)w->next_waiting;
1299 SSL_shutdown(pend->c->ssl);
1300 SSL_free(pend->c->ssl);
1301 pend->c->ssl = NULL;
1304 comm_point_close(pend->c);
1306 pend->next_free = outnet->tcp_free;
1307 outnet->tcp_free = pend;
1311 waiting_tcp_delete(w);
1312 fptr_ok(fptr_whitelist_pending_tcp(cb));
1313 (void)(*cb)(NULL, cb_arg, NETEVENT_TIMEOUT, NULL);
1314 use_free_buffer(outnet);
1318 pending_tcp_query(struct serviced_query* sq, sldns_buffer* packet,
1319 int timeout, comm_point_callback_type* callback, void* callback_arg)
1321 struct pending_tcp* pend = sq->outnet->tcp_free;
1322 struct waiting_tcp* w;
1325 /* if no buffer is free allocate space to store query */
1326 w = (struct waiting_tcp*)malloc(sizeof(struct waiting_tcp)
1327 + (pend?0:sldns_buffer_limit(packet)));
1331 if(!(w->timer = comm_timer_create(sq->outnet->base, outnet_tcptimer, w))) {
1337 id = ((unsigned)ub_random(sq->outnet->rnd)>>8) & 0xffff;
1338 LDNS_ID_SET(sldns_buffer_begin(packet), id);
1339 memcpy(&w->addr, &sq->addr, sq->addrlen);
1340 w->addrlen = sq->addrlen;
1341 w->outnet = sq->outnet;
1343 w->cb_arg = callback_arg;
1344 w->ssl_upstream = sq->ssl_upstream;
1345 w->tls_auth_name = sq->tls_auth_name;
1347 tv.tv_sec = timeout/1000;
1348 tv.tv_usec = (timeout%1000)*1000;
1350 comm_timer_set(w->timer, &tv);
1352 /* we have a buffer available right now */
1353 if(!outnet_tcp_take_into_use(w, sldns_buffer_begin(packet),
1354 sldns_buffer_limit(packet))) {
1355 waiting_tcp_delete(w);
1359 if(sq->outnet->dtenv &&
1360 (sq->outnet->dtenv->log_resolver_query_messages ||
1361 sq->outnet->dtenv->log_forwarder_query_messages))
1362 dt_msg_send_outside_query(sq->outnet->dtenv, &sq->addr,
1363 comm_tcp, sq->zone, sq->zonelen, packet);
1367 w->pkt = (uint8_t*)w + sizeof(struct waiting_tcp);
1368 w->pkt_len = sldns_buffer_limit(packet);
1369 memmove(w->pkt, sldns_buffer_begin(packet), w->pkt_len);
1370 w->next_waiting = NULL;
1371 if(sq->outnet->tcp_wait_last)
1372 sq->outnet->tcp_wait_last->next_waiting = w;
1373 else sq->outnet->tcp_wait_first = w;
1374 sq->outnet->tcp_wait_last = w;
1379 /** create query for serviced queries */
1381 serviced_gen_query(sldns_buffer* buff, uint8_t* qname, size_t qnamelen,
1382 uint16_t qtype, uint16_t qclass, uint16_t flags)
1384 sldns_buffer_clear(buff);
1386 sldns_buffer_write_u16(buff, flags);
1387 sldns_buffer_write_u16(buff, 1); /* qdcount */
1388 sldns_buffer_write_u16(buff, 0); /* ancount */
1389 sldns_buffer_write_u16(buff, 0); /* nscount */
1390 sldns_buffer_write_u16(buff, 0); /* arcount */
1391 sldns_buffer_write(buff, qname, qnamelen);
1392 sldns_buffer_write_u16(buff, qtype);
1393 sldns_buffer_write_u16(buff, qclass);
1394 sldns_buffer_flip(buff);
1397 /** lookup serviced query in serviced query rbtree */
1398 static struct serviced_query*
1399 lookup_serviced(struct outside_network* outnet, sldns_buffer* buff, int dnssec,
1400 struct sockaddr_storage* addr, socklen_t addrlen,
1401 struct edns_option* opt_list)
1403 struct serviced_query key;
1404 key.node.key = &key;
1405 key.qbuf = sldns_buffer_begin(buff);
1406 key.qbuflen = sldns_buffer_limit(buff);
1407 key.dnssec = dnssec;
1408 memcpy(&key.addr, addr, addrlen);
1409 key.addrlen = addrlen;
1410 key.outnet = outnet;
1411 key.opt_list = opt_list;
1412 return (struct serviced_query*)rbtree_search(outnet->serviced, &key);
1415 /** Create new serviced entry */
1416 static struct serviced_query*
1417 serviced_create(struct outside_network* outnet, sldns_buffer* buff, int dnssec,
1418 int want_dnssec, int nocaps, int tcp_upstream, int ssl_upstream,
1419 char* tls_auth_name, struct sockaddr_storage* addr, socklen_t addrlen,
1420 uint8_t* zone, size_t zonelen, int qtype, struct edns_option* opt_list)
1422 struct serviced_query* sq = (struct serviced_query*)malloc(sizeof(*sq));
1423 #ifdef UNBOUND_DEBUG
1429 sq->qbuf = memdup(sldns_buffer_begin(buff), sldns_buffer_limit(buff));
1434 sq->qbuflen = sldns_buffer_limit(buff);
1435 sq->zone = memdup(zone, zonelen);
1441 sq->zonelen = zonelen;
1443 sq->dnssec = dnssec;
1444 sq->want_dnssec = want_dnssec;
1445 sq->nocaps = nocaps;
1446 sq->tcp_upstream = tcp_upstream;
1447 sq->ssl_upstream = ssl_upstream;
1449 sq->tls_auth_name = strdup(tls_auth_name);
1450 if(!sq->tls_auth_name) {
1457 sq->tls_auth_name = NULL;
1459 memcpy(&sq->addr, addr, addrlen);
1460 sq->addrlen = addrlen;
1461 sq->opt_list = NULL;
1463 sq->opt_list = edns_opt_copy_alloc(opt_list);
1465 free(sq->tls_auth_name);
1472 sq->outnet = outnet;
1475 sq->status = serviced_initial;
1477 sq->to_be_deleted = 0;
1478 #ifdef UNBOUND_DEBUG
1483 rbtree_insert(outnet->serviced, &sq->node);
1484 log_assert(ins != NULL); /* must not be already present */
1488 /** remove waiting tcp from the outnet waiting list */
1490 waiting_list_remove(struct outside_network* outnet, struct waiting_tcp* w)
1492 struct waiting_tcp* p = outnet->tcp_wait_first, *prev = NULL;
1497 prev->next_waiting = w->next_waiting;
1498 else outnet->tcp_wait_first = w->next_waiting;
1499 if(outnet->tcp_wait_last == w)
1500 outnet->tcp_wait_last = prev;
1504 p = p->next_waiting;
1508 /** cleanup serviced query entry */
1510 serviced_delete(struct serviced_query* sq)
1513 /* clear up the pending query */
1514 if(sq->status == serviced_query_UDP_EDNS ||
1515 sq->status == serviced_query_UDP ||
1516 sq->status == serviced_query_UDP_EDNS_FRAG ||
1517 sq->status == serviced_query_UDP_EDNS_fallback) {
1518 struct pending* p = (struct pending*)sq->pending;
1520 portcomm_loweruse(sq->outnet, p->pc);
1521 pending_delete(sq->outnet, p);
1522 /* this call can cause reentrant calls back into the
1524 outnet_send_wait_udp(sq->outnet);
1526 struct waiting_tcp* p = (struct waiting_tcp*)
1528 if(p->pkt == NULL) {
1529 decommission_pending_tcp(sq->outnet,
1530 (struct pending_tcp*)p->next_waiting);
1532 waiting_list_remove(sq->outnet, p);
1533 waiting_tcp_delete(p);
1537 /* does not delete from tree, caller has to do that */
1538 serviced_node_del(&sq->node, NULL);
1541 /** perturb a dname capitalization randomly */
1543 serviced_perturb_qname(struct ub_randstate* rnd, uint8_t* qbuf, size_t len)
1546 uint8_t* d = qbuf + 10;
1547 long int random = 0;
1549 log_assert(len >= 10 + 5 /* offset qname, root, qtype, qclass */);
1554 /* only perturb A-Z, a-z */
1555 if(isalpha((unsigned char)*d)) {
1556 /* get a random bit */
1558 random = ub_random(rnd);
1562 *d = (uint8_t)toupper((unsigned char)*d);
1564 *d = (uint8_t)tolower((unsigned char)*d);
1573 if(verbosity >= VERB_ALGO) {
1574 char buf[LDNS_MAX_DOMAINLEN+1];
1575 dname_str(qbuf+10, buf);
1576 verbose(VERB_ALGO, "qname perturbed to %s", buf);
1580 /** put serviced query into a buffer */
1582 serviced_encode(struct serviced_query* sq, sldns_buffer* buff, int with_edns)
1584 /* if we are using 0x20 bits for ID randomness, perturb them */
1585 if(sq->outnet->use_caps_for_id && !sq->nocaps) {
1586 serviced_perturb_qname(sq->outnet->rnd, sq->qbuf, sq->qbuflen);
1588 /* generate query */
1589 sldns_buffer_clear(buff);
1590 sldns_buffer_write_u16(buff, 0); /* id placeholder */
1591 sldns_buffer_write(buff, sq->qbuf, sq->qbuflen);
1592 sldns_buffer_flip(buff);
1594 /* add edns section */
1595 struct edns_data edns;
1596 edns.edns_present = 1;
1598 edns.edns_version = EDNS_ADVERTISED_VERSION;
1599 edns.opt_list = sq->opt_list;
1600 if(sq->status == serviced_query_UDP_EDNS_FRAG) {
1601 if(addr_is_ip6(&sq->addr, sq->addrlen)) {
1602 if(EDNS_FRAG_SIZE_IP6 < EDNS_ADVERTISED_SIZE)
1603 edns.udp_size = EDNS_FRAG_SIZE_IP6;
1604 else edns.udp_size = EDNS_ADVERTISED_SIZE;
1606 if(EDNS_FRAG_SIZE_IP4 < EDNS_ADVERTISED_SIZE)
1607 edns.udp_size = EDNS_FRAG_SIZE_IP4;
1608 else edns.udp_size = EDNS_ADVERTISED_SIZE;
1611 edns.udp_size = EDNS_ADVERTISED_SIZE;
1614 if(sq->dnssec & EDNS_DO)
1615 edns.bits = EDNS_DO;
1616 if(sq->dnssec & BIT_CD)
1617 LDNS_CD_SET(sldns_buffer_begin(buff));
1618 attach_edns_record(buff, &edns);
1623 * Perform serviced query UDP sending operation.
1624 * Sends UDP with EDNS, unless infra host marked non EDNS.
1625 * @param sq: query to send.
1626 * @param buff: buffer scratch space.
1627 * @return 0 on error.
1630 serviced_udp_send(struct serviced_query* sq, sldns_buffer* buff)
1633 uint8_t edns_lame_known;
1634 time_t now = *sq->outnet->now_secs;
1636 if(!infra_host(sq->outnet->infra, &sq->addr, sq->addrlen, sq->zone,
1637 sq->zonelen, now, &vs, &edns_lame_known, &rtt))
1640 verbose(VERB_ALGO, "EDNS lookup known=%d vs=%d", edns_lame_known, vs);
1641 if(sq->status == serviced_initial) {
1643 sq->status = serviced_query_UDP_EDNS;
1645 sq->status = serviced_query_UDP;
1648 serviced_encode(sq, buff, (sq->status == serviced_query_UDP_EDNS) ||
1649 (sq->status == serviced_query_UDP_EDNS_FRAG));
1650 sq->last_sent_time = *sq->outnet->now_tv;
1651 sq->edns_lame_known = (int)edns_lame_known;
1652 verbose(VERB_ALGO, "serviced query UDP timeout=%d msec", rtt);
1653 sq->pending = pending_udp_query(sq, buff, rtt,
1654 serviced_udp_callback, sq);
1660 /** check that perturbed qname is identical */
1662 serviced_check_qname(sldns_buffer* pkt, uint8_t* qbuf, size_t qbuflen)
1664 uint8_t* d1 = sldns_buffer_begin(pkt)+12;
1665 uint8_t* d2 = qbuf+10;
1668 if(sldns_buffer_limit(pkt) < 12+1+4) /* packet too small for qname */
1670 log_assert(qbuflen >= 15 /* 10 header, root, type, class */);
1673 while(len1 != 0 || len2 != 0) {
1674 if(LABEL_IS_PTR(len1)) {
1675 /* check if we can read *d1 with compression ptr rest */
1676 if(d1 >= sldns_buffer_at(pkt, sldns_buffer_limit(pkt)))
1678 d1 = sldns_buffer_begin(pkt)+PTR_OFFSET(len1, *d1);
1679 /* check if we can read the destination *d1 */
1680 if(d1 >= sldns_buffer_at(pkt, sldns_buffer_limit(pkt)))
1683 if(count++ > MAX_COMPRESS_PTRS)
1687 if(d2 > qbuf+qbuflen)
1691 if(len1 > LDNS_MAX_LABELLEN)
1693 /* check len1 + 1(next length) are okay to read */
1694 if(d1+len1 >= sldns_buffer_at(pkt, sldns_buffer_limit(pkt)))
1696 log_assert(len1 <= LDNS_MAX_LABELLEN);
1697 log_assert(len2 <= LDNS_MAX_LABELLEN);
1698 log_assert(len1 == len2 && len1 != 0);
1699 /* compare the labels - bitwise identical */
1700 if(memcmp(d1, d2, len1) != 0)
1710 /** call the callbacks for a serviced query */
1712 serviced_callbacks(struct serviced_query* sq, int error, struct comm_point* c,
1713 struct comm_reply* rep)
1715 struct service_callback* p;
1716 int dobackup = (sq->cblist && sq->cblist->next); /* >1 cb*/
1717 uint8_t *backup_p = NULL;
1719 #ifdef UNBOUND_DEBUG
1724 /* remove from tree, and schedule for deletion, so that callbacks
1725 * can safely deregister themselves and even create new serviced
1726 * queries that are identical to this one. */
1727 rbtree_delete(sq->outnet->serviced, sq);
1728 log_assert(rem); /* should have been present */
1729 sq->to_be_deleted = 1;
1730 verbose(VERB_ALGO, "svcd callbacks start");
1731 if(sq->outnet->use_caps_for_id && error == NETEVENT_NOERROR && c &&
1732 !sq->nocaps && sq->qtype != LDNS_RR_TYPE_PTR) {
1733 /* for type PTR do not check perturbed name in answer,
1734 * compatibility with cisco dns guard boxes that mess up
1735 * reverse queries 0x20 contents */
1736 /* noerror and nxdomain must have a qname in reply */
1737 if(sldns_buffer_read_u16_at(c->buffer, 4) == 0 &&
1738 (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer))
1739 == LDNS_RCODE_NOERROR ||
1740 LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer))
1741 == LDNS_RCODE_NXDOMAIN)) {
1742 verbose(VERB_DETAIL, "no qname in reply to check 0x20ID");
1743 log_addr(VERB_DETAIL, "from server",
1744 &sq->addr, sq->addrlen);
1745 log_buf(VERB_DETAIL, "for packet", c->buffer);
1746 error = NETEVENT_CLOSED;
1748 } else if(sldns_buffer_read_u16_at(c->buffer, 4) > 0 &&
1749 !serviced_check_qname(c->buffer, sq->qbuf,
1751 verbose(VERB_DETAIL, "wrong 0x20-ID in reply qname");
1752 log_addr(VERB_DETAIL, "from server",
1753 &sq->addr, sq->addrlen);
1754 log_buf(VERB_DETAIL, "for packet", c->buffer);
1755 error = NETEVENT_CAPSFAIL;
1756 /* and cleanup too */
1757 pkt_dname_tolower(c->buffer,
1758 sldns_buffer_at(c->buffer, 12));
1760 verbose(VERB_ALGO, "good 0x20-ID in reply qname");
1761 /* cleanup caps, prettier cache contents. */
1762 pkt_dname_tolower(c->buffer,
1763 sldns_buffer_at(c->buffer, 12));
1767 /* make a backup of the query, since the querystate processing
1768 * may send outgoing queries that overwrite the buffer.
1769 * use secondary buffer to store the query.
1770 * This is a data copy, but faster than packet to server */
1771 backlen = sldns_buffer_limit(c->buffer);
1772 backup_p = memdup(sldns_buffer_begin(c->buffer), backlen);
1774 log_err("malloc failure in serviced query callbacks");
1775 error = NETEVENT_CLOSED;
1778 sq->outnet->svcd_overhead = backlen;
1780 /* test the actual sq->cblist, because the next elem could be deleted*/
1781 while((p=sq->cblist) != NULL) {
1782 sq->cblist = p->next; /* remove this element */
1784 sldns_buffer_clear(c->buffer);
1785 sldns_buffer_write(c->buffer, backup_p, backlen);
1786 sldns_buffer_flip(c->buffer);
1788 fptr_ok(fptr_whitelist_serviced_query(p->cb));
1789 (void)(*p->cb)(c, p->cb_arg, error, rep);
1794 sq->outnet->svcd_overhead = 0;
1796 verbose(VERB_ALGO, "svcd callbacks end");
1797 log_assert(sq->cblist == NULL);
1798 serviced_delete(sq);
1802 serviced_tcp_callback(struct comm_point* c, void* arg, int error,
1803 struct comm_reply* rep)
1805 struct serviced_query* sq = (struct serviced_query*)arg;
1806 struct comm_reply r2;
1807 sq->pending = NULL; /* removed after this callback */
1808 if(error != NETEVENT_NOERROR)
1809 log_addr(VERB_QUERY, "tcp error for address",
1810 &sq->addr, sq->addrlen);
1811 if(error==NETEVENT_NOERROR)
1812 infra_update_tcp_works(sq->outnet->infra, &sq->addr,
1813 sq->addrlen, sq->zone, sq->zonelen);
1815 if(error==NETEVENT_NOERROR && sq->outnet->dtenv &&
1816 (sq->outnet->dtenv->log_resolver_response_messages ||
1817 sq->outnet->dtenv->log_forwarder_response_messages))
1818 dt_msg_send_outside_response(sq->outnet->dtenv, &sq->addr,
1819 c->type, sq->zone, sq->zonelen, sq->qbuf, sq->qbuflen,
1820 &sq->last_sent_time, sq->outnet->now_tv, c->buffer);
1822 if(error==NETEVENT_NOERROR && sq->status == serviced_query_TCP_EDNS &&
1823 (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
1824 LDNS_RCODE_FORMERR || LDNS_RCODE_WIRE(sldns_buffer_begin(
1825 c->buffer)) == LDNS_RCODE_NOTIMPL) ) {
1826 /* attempt to fallback to nonEDNS */
1827 sq->status = serviced_query_TCP_EDNS_fallback;
1828 serviced_tcp_initiate(sq, c->buffer);
1830 } else if(error==NETEVENT_NOERROR &&
1831 sq->status == serviced_query_TCP_EDNS_fallback &&
1832 (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
1833 LDNS_RCODE_NOERROR || LDNS_RCODE_WIRE(
1834 sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NXDOMAIN
1835 || LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer))
1836 == LDNS_RCODE_YXDOMAIN)) {
1837 /* the fallback produced a result that looks promising, note
1838 * that this server should be approached without EDNS */
1839 /* only store noEDNS in cache if domain is noDNSSEC */
1840 if(!sq->want_dnssec)
1841 if(!infra_edns_update(sq->outnet->infra, &sq->addr,
1842 sq->addrlen, sq->zone, sq->zonelen, -1,
1843 *sq->outnet->now_secs))
1844 log_err("Out of memory caching no edns for host");
1845 sq->status = serviced_query_TCP;
1847 if(sq->tcp_upstream || sq->ssl_upstream) {
1848 struct timeval now = *sq->outnet->now_tv;
1849 if(error!=NETEVENT_NOERROR) {
1850 if(!infra_rtt_update(sq->outnet->infra, &sq->addr,
1851 sq->addrlen, sq->zone, sq->zonelen, sq->qtype,
1852 -1, sq->last_rtt, (time_t)now.tv_sec))
1853 log_err("out of memory in TCP exponential backoff.");
1854 } else if(now.tv_sec > sq->last_sent_time.tv_sec ||
1855 (now.tv_sec == sq->last_sent_time.tv_sec &&
1856 now.tv_usec > sq->last_sent_time.tv_usec)) {
1857 /* convert from microseconds to milliseconds */
1858 int roundtime = ((int)(now.tv_sec - sq->last_sent_time.tv_sec))*1000
1859 + ((int)now.tv_usec - (int)sq->last_sent_time.tv_usec)/1000;
1860 verbose(VERB_ALGO, "measured TCP-time at %d msec", roundtime);
1861 log_assert(roundtime >= 0);
1862 /* only store if less then AUTH_TIMEOUT seconds, it could be
1863 * huge due to system-hibernated and we woke up */
1864 if(roundtime < 60000) {
1865 if(!infra_rtt_update(sq->outnet->infra, &sq->addr,
1866 sq->addrlen, sq->zone, sq->zonelen, sq->qtype,
1867 roundtime, sq->last_rtt, (time_t)now.tv_sec))
1868 log_err("out of memory noting rtt.");
1872 /* insert address into reply info */
1874 /* create one if there isn't (on errors) */
1878 memcpy(&rep->addr, &sq->addr, sq->addrlen);
1879 rep->addrlen = sq->addrlen;
1880 serviced_callbacks(sq, error, c, rep);
1885 serviced_tcp_initiate(struct serviced_query* sq, sldns_buffer* buff)
1887 verbose(VERB_ALGO, "initiate TCP query %s",
1888 sq->status==serviced_query_TCP_EDNS?"EDNS":"");
1889 serviced_encode(sq, buff, sq->status == serviced_query_TCP_EDNS);
1890 sq->last_sent_time = *sq->outnet->now_tv;
1891 sq->pending = pending_tcp_query(sq, buff, TCP_AUTH_QUERY_TIMEOUT,
1892 serviced_tcp_callback, sq);
1894 /* delete from tree so that a retry by above layer does not
1895 * clash with this entry */
1896 verbose(VERB_ALGO, "serviced_tcp_initiate: failed to send tcp query");
1897 serviced_callbacks(sq, NETEVENT_CLOSED, NULL, NULL);
1901 /** Send serviced query over TCP return false on initial failure */
1903 serviced_tcp_send(struct serviced_query* sq, sldns_buffer* buff)
1905 int vs, rtt, timeout;
1906 uint8_t edns_lame_known;
1907 if(!infra_host(sq->outnet->infra, &sq->addr, sq->addrlen, sq->zone,
1908 sq->zonelen, *sq->outnet->now_secs, &vs, &edns_lame_known,
1913 sq->status = serviced_query_TCP_EDNS;
1914 else sq->status = serviced_query_TCP;
1915 serviced_encode(sq, buff, sq->status == serviced_query_TCP_EDNS);
1916 sq->last_sent_time = *sq->outnet->now_tv;
1917 if(sq->tcp_upstream || sq->ssl_upstream) {
1919 if(rtt >= UNKNOWN_SERVER_NICENESS && rtt < TCP_AUTH_QUERY_TIMEOUT)
1920 timeout = TCP_AUTH_QUERY_TIMEOUT;
1922 timeout = TCP_AUTH_QUERY_TIMEOUT;
1924 sq->pending = pending_tcp_query(sq, buff, timeout,
1925 serviced_tcp_callback, sq);
1926 return sq->pending != NULL;
1929 /* see if packet is edns malformed; got zeroes at start.
1930 * This is from servers that return malformed packets to EDNS0 queries,
1931 * but they return good packets for nonEDNS0 queries.
1932 * We try to detect their output; without resorting to a full parse or
1933 * check for too many bytes after the end of the packet. */
1935 packet_edns_malformed(struct sldns_buffer* buf, int qtype)
1938 if(sldns_buffer_limit(buf) < LDNS_HEADER_SIZE)
1939 return 1; /* malformed */
1940 /* they have NOERROR rcode, 1 answer. */
1941 if(LDNS_RCODE_WIRE(sldns_buffer_begin(buf)) != LDNS_RCODE_NOERROR)
1943 /* one query (to skip) and answer records */
1944 if(LDNS_QDCOUNT(sldns_buffer_begin(buf)) != 1 ||
1945 LDNS_ANCOUNT(sldns_buffer_begin(buf)) == 0)
1948 len = dname_valid(sldns_buffer_at(buf, LDNS_HEADER_SIZE),
1949 sldns_buffer_limit(buf)-LDNS_HEADER_SIZE);
1952 if(len == 1 && qtype == 0)
1953 return 0; /* we asked for '.' and type 0 */
1954 /* and then 4 bytes (type and class of query) */
1955 if(sldns_buffer_limit(buf) < LDNS_HEADER_SIZE + len + 4 + 3)
1958 /* and start with 11 zeroes as the answer RR */
1959 /* so check the qtype of the answer record, qname=0, type=0 */
1960 if(sldns_buffer_at(buf, LDNS_HEADER_SIZE+len+4)[0] == 0 &&
1961 sldns_buffer_at(buf, LDNS_HEADER_SIZE+len+4)[1] == 0 &&
1962 sldns_buffer_at(buf, LDNS_HEADER_SIZE+len+4)[2] == 0)
1968 serviced_udp_callback(struct comm_point* c, void* arg, int error,
1969 struct comm_reply* rep)
1971 struct serviced_query* sq = (struct serviced_query*)arg;
1972 struct outside_network* outnet = sq->outnet;
1973 struct timeval now = *sq->outnet->now_tv;
1975 sq->pending = NULL; /* removed after callback */
1976 if(error == NETEVENT_TIMEOUT) {
1977 if(sq->status == serviced_query_UDP_EDNS && sq->last_rtt < 5000) {
1978 /* fallback to 1480/1280 */
1979 sq->status = serviced_query_UDP_EDNS_FRAG;
1980 log_name_addr(VERB_ALGO, "try edns1xx0", sq->qbuf+10,
1981 &sq->addr, sq->addrlen);
1982 if(!serviced_udp_send(sq, c->buffer)) {
1983 serviced_callbacks(sq, NETEVENT_CLOSED, c, rep);
1987 if(sq->status == serviced_query_UDP_EDNS_FRAG) {
1988 /* fragmentation size did not fix it */
1989 sq->status = serviced_query_UDP_EDNS;
1992 if(!infra_rtt_update(outnet->infra, &sq->addr, sq->addrlen,
1993 sq->zone, sq->zonelen, sq->qtype, -1, sq->last_rtt,
1994 (time_t)now.tv_sec))
1995 log_err("out of memory in UDP exponential backoff");
1996 if(sq->retry < OUTBOUND_UDP_RETRY) {
1997 log_name_addr(VERB_ALGO, "retry query", sq->qbuf+10,
1998 &sq->addr, sq->addrlen);
1999 if(!serviced_udp_send(sq, c->buffer)) {
2000 serviced_callbacks(sq, NETEVENT_CLOSED, c, rep);
2005 if(error != NETEVENT_NOERROR) {
2006 /* udp returns error (due to no ID or interface available) */
2007 serviced_callbacks(sq, error, c, rep);
2011 if(error == NETEVENT_NOERROR && outnet->dtenv &&
2012 (outnet->dtenv->log_resolver_response_messages ||
2013 outnet->dtenv->log_forwarder_response_messages))
2014 dt_msg_send_outside_response(outnet->dtenv, &sq->addr, c->type,
2015 sq->zone, sq->zonelen, sq->qbuf, sq->qbuflen,
2016 &sq->last_sent_time, sq->outnet->now_tv, c->buffer);
2018 if( (sq->status == serviced_query_UDP_EDNS
2019 ||sq->status == serviced_query_UDP_EDNS_FRAG)
2020 && (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer))
2021 == LDNS_RCODE_FORMERR || LDNS_RCODE_WIRE(
2022 sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NOTIMPL
2023 || packet_edns_malformed(c->buffer, sq->qtype)
2025 /* try to get an answer by falling back without EDNS */
2026 verbose(VERB_ALGO, "serviced query: attempt without EDNS");
2027 sq->status = serviced_query_UDP_EDNS_fallback;
2029 if(!serviced_udp_send(sq, c->buffer)) {
2030 serviced_callbacks(sq, NETEVENT_CLOSED, c, rep);
2033 } else if(sq->status == serviced_query_UDP_EDNS &&
2034 !sq->edns_lame_known) {
2035 /* now we know that edns queries received answers store that */
2036 log_addr(VERB_ALGO, "serviced query: EDNS works for",
2037 &sq->addr, sq->addrlen);
2038 if(!infra_edns_update(outnet->infra, &sq->addr, sq->addrlen,
2039 sq->zone, sq->zonelen, 0, (time_t)now.tv_sec)) {
2040 log_err("Out of memory caching edns works");
2042 sq->edns_lame_known = 1;
2043 } else if(sq->status == serviced_query_UDP_EDNS_fallback &&
2044 !sq->edns_lame_known && (LDNS_RCODE_WIRE(
2045 sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NOERROR ||
2046 LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) ==
2047 LDNS_RCODE_NXDOMAIN || LDNS_RCODE_WIRE(sldns_buffer_begin(
2048 c->buffer)) == LDNS_RCODE_YXDOMAIN)) {
2049 /* the fallback produced a result that looks promising, note
2050 * that this server should be approached without EDNS */
2051 /* only store noEDNS in cache if domain is noDNSSEC */
2052 if(!sq->want_dnssec) {
2053 log_addr(VERB_ALGO, "serviced query: EDNS fails for",
2054 &sq->addr, sq->addrlen);
2055 if(!infra_edns_update(outnet->infra, &sq->addr, sq->addrlen,
2056 sq->zone, sq->zonelen, -1, (time_t)now.tv_sec)) {
2057 log_err("Out of memory caching no edns for host");
2060 log_addr(VERB_ALGO, "serviced query: EDNS fails, but "
2061 "not stored because need DNSSEC for", &sq->addr,
2064 sq->status = serviced_query_UDP;
2066 if(now.tv_sec > sq->last_sent_time.tv_sec ||
2067 (now.tv_sec == sq->last_sent_time.tv_sec &&
2068 now.tv_usec > sq->last_sent_time.tv_usec)) {
2069 /* convert from microseconds to milliseconds */
2070 int roundtime = ((int)(now.tv_sec - sq->last_sent_time.tv_sec))*1000
2071 + ((int)now.tv_usec - (int)sq->last_sent_time.tv_usec)/1000;
2072 verbose(VERB_ALGO, "measured roundtrip at %d msec", roundtime);
2073 log_assert(roundtime >= 0);
2074 /* in case the system hibernated, do not enter a huge value,
2075 * above this value gives trouble with server selection */
2076 if(roundtime < 60000) {
2077 if(!infra_rtt_update(outnet->infra, &sq->addr, sq->addrlen,
2078 sq->zone, sq->zonelen, sq->qtype, roundtime,
2079 sq->last_rtt, (time_t)now.tv_sec))
2080 log_err("out of memory noting rtt.");
2083 /* perform TC flag check and TCP fallback after updating our
2084 * cache entries for EDNS status and RTT times */
2085 if(LDNS_TC_WIRE(sldns_buffer_begin(c->buffer))) {
2086 /* fallback to TCP */
2087 /* this discards partial UDP contents */
2088 if(sq->status == serviced_query_UDP_EDNS ||
2089 sq->status == serviced_query_UDP_EDNS_FRAG ||
2090 sq->status == serviced_query_UDP_EDNS_fallback)
2091 /* if we have unfinished EDNS_fallback, start again */
2092 sq->status = serviced_query_TCP_EDNS;
2093 else sq->status = serviced_query_TCP;
2094 serviced_tcp_initiate(sq, c->buffer);
2097 /* yay! an answer */
2098 serviced_callbacks(sq, error, c, rep);
2102 struct serviced_query*
2103 outnet_serviced_query(struct outside_network* outnet,
2104 struct query_info* qinfo, uint16_t flags, int dnssec, int want_dnssec,
2105 int nocaps, int tcp_upstream, int ssl_upstream, char* tls_auth_name,
2106 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone,
2107 size_t zonelen, struct module_qstate* qstate,
2108 comm_point_callback_type* callback, void* callback_arg, sldns_buffer* buff,
2109 struct module_env* env)
2111 struct serviced_query* sq;
2112 struct service_callback* cb;
2113 if(!inplace_cb_query_call(env, qinfo, flags, addr, addrlen, zone, zonelen,
2114 qstate, qstate->region))
2116 serviced_gen_query(buff, qinfo->qname, qinfo->qname_len, qinfo->qtype,
2117 qinfo->qclass, flags);
2118 sq = lookup_serviced(outnet, buff, dnssec, addr, addrlen,
2119 qstate->edns_opts_back_out);
2120 /* duplicate entries are included in the callback list, because
2121 * there is a counterpart registration by our caller that needs to
2122 * be doubly-removed (with callbacks perhaps). */
2123 if(!(cb = (struct service_callback*)malloc(sizeof(*cb))))
2126 /* make new serviced query entry */
2127 sq = serviced_create(outnet, buff, dnssec, want_dnssec, nocaps,
2128 tcp_upstream, ssl_upstream, tls_auth_name, addr,
2129 addrlen, zone, zonelen, (int)qinfo->qtype,
2130 qstate->edns_opts_back_out);
2135 /* perform first network action */
2136 if(outnet->do_udp && !(tcp_upstream || ssl_upstream)) {
2137 if(!serviced_udp_send(sq, buff)) {
2138 (void)rbtree_delete(outnet->serviced, sq);
2139 serviced_node_del(&sq->node, NULL);
2144 if(!serviced_tcp_send(sq, buff)) {
2145 (void)rbtree_delete(outnet->serviced, sq);
2146 serviced_node_del(&sq->node, NULL);
2152 /* add callback to list of callbacks */
2154 cb->cb_arg = callback_arg;
2155 cb->next = sq->cblist;
2160 /** remove callback from list */
2162 callback_list_remove(struct serviced_query* sq, void* cb_arg)
2164 struct service_callback** pp = &sq->cblist;
2166 if((*pp)->cb_arg == cb_arg) {
2167 struct service_callback* del = *pp;
2176 void outnet_serviced_query_stop(struct serviced_query* sq, void* cb_arg)
2180 callback_list_remove(sq, cb_arg);
2181 /* if callbacks() routine scheduled deletion, let it do that */
2182 if(!sq->cblist && !sq->to_be_deleted) {
2183 (void)rbtree_delete(sq->outnet->serviced, sq);
2184 serviced_delete(sq);
2188 /** create fd to send to this destination */
2190 fd_for_dest(struct outside_network* outnet, struct sockaddr_storage* to_addr,
2191 socklen_t to_addrlen)
2193 struct sockaddr_storage* addr;
2196 struct port_if* pif;
2199 for(try = 0; try<1000; try++) {
2206 /* select interface */
2207 if(addr_is_ip6(to_addr, to_addrlen)) {
2208 if(outnet->num_ip6 == 0) {
2210 addr_to_str(to_addr, to_addrlen, to, sizeof(to));
2211 verbose(VERB_QUERY, "need ipv6 to send, but no ipv6 outgoing interfaces, for %s", to);
2214 i = ub_random_max(outnet->rnd, outnet->num_ip6);
2215 pif = &outnet->ip6_ifs[i];
2217 if(outnet->num_ip4 == 0) {
2219 addr_to_str(to_addr, to_addrlen, to, sizeof(to));
2220 verbose(VERB_QUERY, "need ipv4 to send, but no ipv4 outgoing interfaces, for %s", to);
2223 i = ub_random_max(outnet->rnd, outnet->num_ip4);
2224 pif = &outnet->ip4_ifs[i];
2227 addrlen = pif->addrlen;
2228 pnum = ub_random_max(outnet->rnd, pif->avail_total);
2229 if(pnum < pif->inuse) {
2230 /* port already open */
2231 port = pif->out[pnum]->number;
2233 /* unused ports in start part of array */
2234 port = pif->avail_ports[pnum - pif->inuse];
2237 if(addr_is_ip6(to_addr, to_addrlen)) {
2238 struct sockaddr_in6 sa = *(struct sockaddr_in6*)addr;
2239 sa.sin6_port = (in_port_t)htons((uint16_t)port);
2240 fd = create_udp_sock(AF_INET6, SOCK_DGRAM,
2241 (struct sockaddr*)&sa, addrlen, 1, &inuse, &noproto,
2242 0, 0, 0, NULL, 0, freebind, 0);
2244 struct sockaddr_in* sa = (struct sockaddr_in*)addr;
2245 sa->sin_port = (in_port_t)htons((uint16_t)port);
2246 fd = create_udp_sock(AF_INET, SOCK_DGRAM,
2247 (struct sockaddr*)addr, addrlen, 1, &inuse, &noproto,
2248 0, 0, 0, NULL, 0, freebind, 0);
2257 /* too many tries */
2258 log_err("cannot send probe, ports are in use");
2263 outnet_comm_point_for_udp(struct outside_network* outnet,
2264 comm_point_callback_type* cb, void* cb_arg,
2265 struct sockaddr_storage* to_addr, socklen_t to_addrlen)
2267 struct comm_point* cp;
2268 int fd = fd_for_dest(outnet, to_addr, to_addrlen);
2272 cp = comm_point_create_udp(outnet->base, fd, outnet->udp_buff,
2275 log_err("malloc failure");
2282 /** setup SSL for comm point */
2284 setup_comm_ssl(struct comm_point* cp, struct outside_network* outnet,
2287 cp->ssl = outgoing_ssl_fd(outnet->sslctx, fd);
2289 log_err("cannot create SSL object");
2293 comm_point_tcp_win_bio_cb(cp, cp->ssl);
2295 cp->ssl_shake_state = comm_ssl_shake_write;
2296 /* https verification */
2297 #ifdef HAVE_SSL_SET1_HOST
2298 if((SSL_CTX_get_verify_mode(outnet->sslctx)&SSL_VERIFY_PEER)) {
2299 /* because we set SSL_VERIFY_PEER, in netevent in
2300 * ssl_handshake, it'll check if the certificate
2301 * verification has succeeded */
2302 /* SSL_VERIFY_PEER is set on the sslctx */
2303 /* and the certificates to verify with are loaded into
2304 * it with SSL_load_verify_locations or
2305 * SSL_CTX_set_default_verify_paths */
2306 /* setting the hostname makes openssl verify the
2307 * host name in the x509 certificate in the
2309 if(!SSL_set1_host(cp->ssl, host)) {
2310 log_err("SSL_set1_host failed");
2314 #elif defined(HAVE_X509_VERIFY_PARAM_SET1_HOST)
2315 /* openssl 1.0.2 has this function that can be used for
2316 * set1_host like verification */
2317 if((SSL_CTX_get_verify_mode(outnet->sslctx)&SSL_VERIFY_PEER)) {
2318 X509_VERIFY_PARAM* param = SSL_get0_param(cp->ssl);
2319 X509_VERIFY_PARAM_set_hostflags(param, X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS);
2320 if(!X509_VERIFY_PARAM_set1_host(param, host, strlen(host))) {
2321 log_err("X509_VERIFY_PARAM_set1_host failed");
2327 #endif /* HAVE_SSL_SET1_HOST */
2332 outnet_comm_point_for_tcp(struct outside_network* outnet,
2333 comm_point_callback_type* cb, void* cb_arg,
2334 struct sockaddr_storage* to_addr, socklen_t to_addrlen,
2335 sldns_buffer* query, int timeout, int ssl, char* host)
2337 struct comm_point* cp;
2338 int fd = outnet_get_tcp_fd(to_addr, to_addrlen, outnet->tcp_mss);
2342 fd_set_nonblock(fd);
2343 if(!outnet_tcp_connect(fd, to_addr, to_addrlen)) {
2344 /* outnet_tcp_connect has closed fd on error for us */
2347 cp = comm_point_create_tcp_out(outnet->base, 65552, cb, cb_arg);
2349 log_err("malloc failure");
2353 cp->repinfo.addrlen = to_addrlen;
2354 memcpy(&cp->repinfo.addr, to_addr, to_addrlen);
2356 /* setup for SSL (if needed) */
2358 if(!setup_comm_ssl(cp, outnet, fd, host)) {
2359 log_err("cannot setup XoT");
2360 comm_point_delete(cp);
2365 /* set timeout on TCP connection */
2366 comm_point_start_listening(cp, fd, timeout);
2367 /* copy scratch buffer to cp->buffer */
2368 sldns_buffer_copy(cp->buffer, query);
2372 /** setup http request headers in buffer for sending query to destination */
2374 setup_http_request(sldns_buffer* buf, char* host, char* path)
2376 sldns_buffer_clear(buf);
2377 sldns_buffer_printf(buf, "GET /%s HTTP/1.1\r\n", path);
2378 sldns_buffer_printf(buf, "Host: %s\r\n", host);
2379 sldns_buffer_printf(buf, "User-Agent: unbound/%s\r\n",
2381 /* We do not really do multiple queries per connection,
2382 * but this header setting is also not needed.
2383 * sldns_buffer_printf(buf, "Connection: close\r\n") */
2384 sldns_buffer_printf(buf, "\r\n");
2385 if(sldns_buffer_position(buf)+10 > sldns_buffer_capacity(buf))
2386 return 0; /* somehow buffer too short, but it is about 60K
2387 and the request is only a couple bytes long. */
2388 sldns_buffer_flip(buf);
2393 outnet_comm_point_for_http(struct outside_network* outnet,
2394 comm_point_callback_type* cb, void* cb_arg,
2395 struct sockaddr_storage* to_addr, socklen_t to_addrlen, int timeout,
2396 int ssl, char* host, char* path)
2398 /* cp calls cb with err=NETEVENT_DONE when transfer is done */
2399 struct comm_point* cp;
2400 int fd = outnet_get_tcp_fd(to_addr, to_addrlen, outnet->tcp_mss);
2404 fd_set_nonblock(fd);
2405 if(!outnet_tcp_connect(fd, to_addr, to_addrlen)) {
2406 /* outnet_tcp_connect has closed fd on error for us */
2409 cp = comm_point_create_http_out(outnet->base, 65552, cb, cb_arg,
2412 log_err("malloc failure");
2416 cp->repinfo.addrlen = to_addrlen;
2417 memcpy(&cp->repinfo.addr, to_addr, to_addrlen);
2419 /* setup for SSL (if needed) */
2421 if(!setup_comm_ssl(cp, outnet, fd, host)) {
2422 log_err("cannot setup https");
2423 comm_point_delete(cp);
2428 /* set timeout on TCP connection */
2429 comm_point_start_listening(cp, fd, timeout);
2431 /* setup http request in cp->buffer */
2432 if(!setup_http_request(cp->buffer, host, path)) {
2433 log_err("error setting up http request");
2434 comm_point_delete(cp);
2440 /** get memory used by waiting tcp entry (in use or not) */
2442 waiting_tcp_get_mem(struct waiting_tcp* w)
2446 s = sizeof(*w) + w->pkt_len;
2448 s += comm_timer_get_mem(w->timer);
2452 /** get memory used by port if */
2454 if_get_mem(struct port_if* pif)
2458 s = sizeof(*pif) + sizeof(int)*pif->avail_total +
2459 sizeof(struct port_comm*)*pif->maxout;
2460 for(i=0; i<pif->inuse; i++)
2461 s += sizeof(*pif->out[i]) +
2462 comm_point_get_mem(pif->out[i]->cp);
2466 /** get memory used by waiting udp */
2468 waiting_udp_get_mem(struct pending* w)
2471 s = sizeof(*w) + comm_timer_get_mem(w->timer) + w->pkt_len;
2475 size_t outnet_get_mem(struct outside_network* outnet)
2479 struct waiting_tcp* w;
2481 struct serviced_query* sq;
2482 struct service_callback* sb;
2483 struct port_comm* pc;
2484 size_t s = sizeof(*outnet) + sizeof(*outnet->base) +
2485 sizeof(*outnet->udp_buff) +
2486 sldns_buffer_capacity(outnet->udp_buff);
2487 /* second buffer is not ours */
2488 for(pc = outnet->unused_fds; pc; pc = pc->next) {
2489 s += sizeof(*pc) + comm_point_get_mem(pc->cp);
2491 for(k=0; k<outnet->num_ip4; k++)
2492 s += if_get_mem(&outnet->ip4_ifs[k]);
2493 for(k=0; k<outnet->num_ip6; k++)
2494 s += if_get_mem(&outnet->ip6_ifs[k]);
2495 for(u=outnet->udp_wait_first; u; u=u->next_waiting)
2496 s += waiting_udp_get_mem(u);
2498 s += sizeof(struct pending_tcp*)*outnet->num_tcp;
2499 for(i=0; i<outnet->num_tcp; i++) {
2500 s += sizeof(struct pending_tcp);
2501 s += comm_point_get_mem(outnet->tcp_conns[i]->c);
2502 if(outnet->tcp_conns[i]->query)
2503 s += waiting_tcp_get_mem(outnet->tcp_conns[i]->query);
2505 for(w=outnet->tcp_wait_first; w; w = w->next_waiting)
2506 s += waiting_tcp_get_mem(w);
2507 s += sizeof(*outnet->pending);
2508 s += (sizeof(struct pending) + comm_timer_get_mem(NULL)) *
2509 outnet->pending->count;
2510 s += sizeof(*outnet->serviced);
2511 s += outnet->svcd_overhead;
2512 RBTREE_FOR(sq, struct serviced_query*, outnet->serviced) {
2513 s += sizeof(*sq) + sq->qbuflen;
2514 for(sb = sq->cblist; sb; sb = sb->next)
2521 serviced_get_mem(struct serviced_query* sq)
2523 struct service_callback* sb;
2525 s = sizeof(*sq) + sq->qbuflen;
2526 for(sb = sq->cblist; sb; sb = sb->next)
2528 if(sq->status == serviced_query_UDP_EDNS ||
2529 sq->status == serviced_query_UDP ||
2530 sq->status == serviced_query_UDP_EDNS_FRAG ||
2531 sq->status == serviced_query_UDP_EDNS_fallback) {
2532 s += sizeof(struct pending);
2533 s += comm_timer_get_mem(NULL);
2535 /* does not have size of the pkt pointer */
2536 /* always has a timer except on malloc failures */
2538 /* these sizes are part of the main outside network mem */
2540 s += sizeof(struct waiting_tcp);
2541 s += comm_timer_get_mem(NULL);