1/* 2 * services/outside_network.c - implement sending of queries and wait answer. 3 * 4 * Copyright (c) 2007, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 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. 18 * 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. 22 * 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. 34 */ 35 36/** 37 * \file 38 * 39 * This file has functions to send queries to authoritative servers and 40 * wait for the pending answer events. 41 */ 42#include "config.h" 43#include <ctype.h> 44#ifdef HAVE_SYS_TYPES_H 45# include <sys/types.h> 46#endif 47#include <sys/time.h> 48#include "services/outside_network.h" 49#include "services/listen_dnsport.h" 50#include "services/cache/infra.h" 51#include "util/data/msgparse.h" 52#include "util/data/msgreply.h" 53#include "util/data/msgencode.h" 54#include "util/data/dname.h" 55#include "util/netevent.h" 56#include "util/log.h" 57#include "util/net_help.h" 58#include "util/random.h" 59#include "util/fptr_wlist.h" 60#include "sldns/sbuffer.h" 61#include "dnstap/dnstap.h" 62#ifdef HAVE_OPENSSL_SSL_H 63#include <openssl/ssl.h> 64#endif 65 66#ifdef HAVE_NETDB_H 67#include <netdb.h> 68#endif 69#include <fcntl.h> 70 71/** number of times to retry making a random ID that is unique. */ 72#define MAX_ID_RETRY 1000 73/** number of times to retry finding interface, port that can be opened. */ 74#define MAX_PORT_RETRY 10000 75/** number of retries on outgoing UDP queries */ 76#define OUTBOUND_UDP_RETRY 1 77 78/** initiate TCP transaction for serviced query */ 79static void serviced_tcp_initiate(struct serviced_query* sq, sldns_buffer* buff); 80/** with a fd available, randomize and send UDP */ 81static int randomize_and_send_udp(struct pending* pend, sldns_buffer* packet, 82 int timeout); 83 84/** remove waiting tcp from the outnet waiting list */ 85static void waiting_list_remove(struct outside_network* outnet, 86 struct waiting_tcp* w); 87 88int 89pending_cmp(const void* key1, const void* key2) 90{ 91 struct pending *p1 = (struct pending*)key1; 92 struct pending *p2 = (struct pending*)key2; 93 if(p1->id < p2->id) 94 return -1; 95 if(p1->id > p2->id) 96 return 1; 97 log_assert(p1->id == p2->id); 98 return sockaddr_cmp(&p1->addr, p1->addrlen, &p2->addr, p2->addrlen); 99} 100 101int 102serviced_cmp(const void* key1, const void* key2) 103{ 104 struct serviced_query* q1 = (struct serviced_query*)key1; 105 struct serviced_query* q2 = (struct serviced_query*)key2; 106 int r; 107 if(q1->qbuflen < q2->qbuflen) 108 return -1; 109 if(q1->qbuflen > q2->qbuflen) 110 return 1; 111 log_assert(q1->qbuflen == q2->qbuflen); 112 log_assert(q1->qbuflen >= 15 /* 10 header, root, type, class */); 113 /* alternate casing of qname is still the same query */ 114 if((r = memcmp(q1->qbuf, q2->qbuf, 10)) != 0) 115 return r; 116 if((r = memcmp(q1->qbuf+q1->qbuflen-4, q2->qbuf+q2->qbuflen-4, 4)) != 0) 117 return r; 118 if(q1->dnssec != q2->dnssec) { 119 if(q1->dnssec < q2->dnssec) 120 return -1; 121 return 1; 122 } 123 if((r = query_dname_compare(q1->qbuf+10, q2->qbuf+10)) != 0) 124 return r; 125 return sockaddr_cmp(&q1->addr, q1->addrlen, &q2->addr, q2->addrlen); 126} 127 128/** delete waiting_tcp entry. Does not unlink from waiting list. 129 * @param w: to delete. 130 */ 131static void 132waiting_tcp_delete(struct waiting_tcp* w) 133{ 134 if(!w) return; 135 if(w->timer) 136 comm_timer_delete(w->timer); 137 free(w); 138} 139 140/** 141 * Pick random outgoing-interface of that family, and bind it. 142 * port set to 0 so OS picks a port number for us. 143 * if it is the ANY address, do not bind. 144 * @param w: tcp structure with destination address. 145 * @param s: socket fd. 146 * @return false on error, socket closed. 147 */ 148static int 149pick_outgoing_tcp(struct waiting_tcp* w, int s) 150{ 151 struct port_if* pi = NULL; 152 int num; 153#ifdef INET6 154 if(addr_is_ip6(&w->addr, w->addrlen)) 155 num = w->outnet->num_ip6; 156 else 157#endif 158 num = w->outnet->num_ip4; 159 if(num == 0) { 160 log_err("no TCP outgoing interfaces of family"); 161 log_addr(VERB_OPS, "for addr", &w->addr, w->addrlen); 162#ifndef USE_WINSOCK 163 close(s); 164#else 165 closesocket(s); 166#endif 167 return 0; 168 } 169#ifdef INET6 170 if(addr_is_ip6(&w->addr, w->addrlen)) 171 pi = &w->outnet->ip6_ifs[ub_random_max(w->outnet->rnd, num)]; 172 else 173#endif 174 pi = &w->outnet->ip4_ifs[ub_random_max(w->outnet->rnd, num)]; 175 log_assert(pi); 176 if(addr_is_any(&pi->addr, pi->addrlen)) { 177 /* binding to the ANY interface is for listening sockets */ 178 return 1; 179 } 180 /* set port to 0 */ 181 if(addr_is_ip6(&pi->addr, pi->addrlen)) 182 ((struct sockaddr_in6*)&pi->addr)->sin6_port = 0; 183 else ((struct sockaddr_in*)&pi->addr)->sin_port = 0; 184 if(bind(s, (struct sockaddr*)&pi->addr, pi->addrlen) != 0) { 185#ifndef USE_WINSOCK 186 log_err("outgoing tcp: bind: %s", strerror(errno)); 187 close(s); 188#else 189 log_err("outgoing tcp: bind: %s", 190 wsa_strerror(WSAGetLastError())); 191 closesocket(s); 192#endif 193 return 0; 194 } 195 log_addr(VERB_ALGO, "tcp bound to src", &pi->addr, pi->addrlen); 196 return 1; 197} 198 199/** use next free buffer to service a tcp query */ 200static int 201outnet_tcp_take_into_use(struct waiting_tcp* w, uint8_t* pkt, size_t pkt_len) 202{ 203 struct pending_tcp* pend = w->outnet->tcp_free; 204 int s; 205 log_assert(pend); 206 log_assert(pkt); 207 log_assert(w->addrlen > 0); 208 /* open socket */ 209#ifdef INET6 210 if(addr_is_ip6(&w->addr, w->addrlen)) 211 s = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP); 212 else 213#endif 214 s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); 215 if(s == -1) { 216#ifndef USE_WINSOCK 217 log_err_addr("outgoing tcp: socket", strerror(errno), 218 &w->addr, w->addrlen); 219#else 220 log_err_addr("outgoing tcp: socket", 221 wsa_strerror(WSAGetLastError()), &w->addr, w->addrlen); 222#endif 223 return 0; 224 } 225 if(!pick_outgoing_tcp(w, s)) 226 return 0; 227 228 fd_set_nonblock(s); 229 if(connect(s, (struct sockaddr*)&w->addr, w->addrlen) == -1) { 230#ifndef USE_WINSOCK 231#ifdef EINPROGRESS 232 if(errno != EINPROGRESS) { 233#else 234 if(1) { 235#endif 236 if(tcp_connect_errno_needs_log( 237 (struct sockaddr*)&w->addr, w->addrlen)) 238 log_err_addr("outgoing tcp: connect", 239 strerror(errno), &w->addr, w->addrlen); 240 close(s); 241#else /* USE_WINSOCK */ 242 if(WSAGetLastError() != WSAEINPROGRESS && 243 WSAGetLastError() != WSAEWOULDBLOCK) { 244 closesocket(s); 245#endif 246 return 0; 247 } 248 } 249 if(w->outnet->sslctx && w->ssl_upstream) { 250 pend->c->ssl = outgoing_ssl_fd(w->outnet->sslctx, s); 251 if(!pend->c->ssl) { 252 pend->c->fd = s; 253 comm_point_close(pend->c); 254 return 0; 255 } 256#ifdef USE_WINSOCK 257 comm_point_tcp_win_bio_cb(pend->c, pend->c->ssl); 258#endif 259 pend->c->ssl_shake_state = comm_ssl_shake_write; 260 } 261 w->pkt = NULL; 262 w->next_waiting = (void*)pend; 263 pend->id = LDNS_ID_WIRE(pkt); 264 w->outnet->num_tcp_outgoing++; 265 w->outnet->tcp_free = pend->next_free; 266 pend->next_free = NULL; 267 pend->query = w; 268 pend->c->repinfo.addrlen = w->addrlen; 269 memcpy(&pend->c->repinfo.addr, &w->addr, w->addrlen); 270 sldns_buffer_clear(pend->c->buffer); 271 sldns_buffer_write(pend->c->buffer, pkt, pkt_len); 272 sldns_buffer_flip(pend->c->buffer); 273 pend->c->tcp_is_reading = 0; 274 pend->c->tcp_byte_count = 0; 275 comm_point_start_listening(pend->c, s, -1); 276 return 1; 277} 278 279/** see if buffers can be used to service TCP queries */ 280static void 281use_free_buffer(struct outside_network* outnet) 282{ 283 struct waiting_tcp* w; 284 while(outnet->tcp_free && outnet->tcp_wait_first 285 && !outnet->want_to_quit) { 286 w = outnet->tcp_wait_first; 287 outnet->tcp_wait_first = w->next_waiting; 288 if(outnet->tcp_wait_last == w) 289 outnet->tcp_wait_last = NULL; 290 if(!outnet_tcp_take_into_use(w, w->pkt, w->pkt_len)) { 291 comm_point_callback_t* cb = w->cb; 292 void* cb_arg = w->cb_arg; 293 waiting_tcp_delete(w); 294 fptr_ok(fptr_whitelist_pending_tcp(cb)); 295 (void)(*cb)(NULL, cb_arg, NETEVENT_CLOSED, NULL); 296 } 297 } 298} 299 300/** decomission a tcp buffer, closes commpoint and frees waiting_tcp entry */ 301static void 302decomission_pending_tcp(struct outside_network* outnet, 303 struct pending_tcp* pend) 304{ 305 if(pend->c->ssl) { 306#ifdef HAVE_SSL 307 SSL_shutdown(pend->c->ssl); 308 SSL_free(pend->c->ssl); 309 pend->c->ssl = NULL; 310#endif 311 } 312 comm_point_close(pend->c); 313 pend->next_free = outnet->tcp_free; 314 outnet->tcp_free = pend; 315 waiting_tcp_delete(pend->query); 316 pend->query = NULL; 317 use_free_buffer(outnet); 318} 319 320int 321outnet_tcp_cb(struct comm_point* c, void* arg, int error, 322 struct comm_reply *reply_info) 323{ 324 struct pending_tcp* pend = (struct pending_tcp*)arg; 325 struct outside_network* outnet = pend->query->outnet; 326 verbose(VERB_ALGO, "outnettcp cb"); 327 if(error != NETEVENT_NOERROR) { 328 verbose(VERB_QUERY, "outnettcp got tcp error %d", error); 329 /* pass error below and exit */ 330 } else { 331 /* check ID */ 332 if(sldns_buffer_limit(c->buffer) < sizeof(uint16_t) || 333 LDNS_ID_WIRE(sldns_buffer_begin(c->buffer))!=pend->id) { 334 log_addr(VERB_QUERY, 335 "outnettcp: bad ID in reply, from:", 336 &pend->query->addr, pend->query->addrlen); 337 error = NETEVENT_CLOSED; 338 } 339 } 340 fptr_ok(fptr_whitelist_pending_tcp(pend->query->cb)); 341 (void)(*pend->query->cb)(c, pend->query->cb_arg, error, reply_info); 342 decomission_pending_tcp(outnet, pend); 343 return 0; 344} 345 346/** lower use count on pc, see if it can be closed */ 347static void 348portcomm_loweruse(struct outside_network* outnet, struct port_comm* pc) 349{ 350 struct port_if* pif; 351 pc->num_outstanding--; 352 if(pc->num_outstanding > 0) { 353 return; 354 } 355 /* close it and replace in unused list */ 356 verbose(VERB_ALGO, "close of port %d", pc->number); 357 comm_point_close(pc->cp); 358 pif = pc->pif; 359 log_assert(pif->inuse > 0); 360 pif->avail_ports[pif->avail_total - pif->inuse] = pc->number; 361 pif->inuse--; 362 pif->out[pc->index] = pif->out[pif->inuse]; 363 pif->out[pc->index]->index = pc->index; 364 pc->next = outnet->unused_fds; 365 outnet->unused_fds = pc; 366} 367 368/** try to send waiting UDP queries */ 369static void 370outnet_send_wait_udp(struct outside_network* outnet) 371{ 372 struct pending* pend; 373 /* process waiting queries */ 374 while(outnet->udp_wait_first && outnet->unused_fds 375 && !outnet->want_to_quit) { 376 pend = outnet->udp_wait_first; 377 outnet->udp_wait_first = pend->next_waiting; 378 if(!pend->next_waiting) outnet->udp_wait_last = NULL; 379 sldns_buffer_clear(outnet->udp_buff); 380 sldns_buffer_write(outnet->udp_buff, pend->pkt, pend->pkt_len); 381 sldns_buffer_flip(outnet->udp_buff); 382 free(pend->pkt); /* freeing now makes get_mem correct */ 383 pend->pkt = NULL; 384 pend->pkt_len = 0; 385 if(!randomize_and_send_udp(pend, outnet->udp_buff, 386 pend->timeout)) { 387 /* callback error on pending */ 388 if(pend->cb) { 389 fptr_ok(fptr_whitelist_pending_udp(pend->cb)); 390 (void)(*pend->cb)(outnet->unused_fds->cp, pend->cb_arg, 391 NETEVENT_CLOSED, NULL); 392 } 393 pending_delete(outnet, pend); 394 } 395 } 396} 397 398int 399outnet_udp_cb(struct comm_point* c, void* arg, int error, 400 struct comm_reply *reply_info) 401{ 402 struct outside_network* outnet = (struct outside_network*)arg; 403 struct pending key; 404 struct pending* p; 405 verbose(VERB_ALGO, "answer cb"); 406 407 if(error != NETEVENT_NOERROR) { 408 verbose(VERB_QUERY, "outnetudp got udp error %d", error); 409 return 0; 410 } 411 if(sldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) { 412 verbose(VERB_QUERY, "outnetudp udp too short"); 413 return 0; 414 } 415 log_assert(reply_info); 416 417 /* setup lookup key */ 418 key.id = (unsigned)LDNS_ID_WIRE(sldns_buffer_begin(c->buffer)); 419 memcpy(&key.addr, &reply_info->addr, reply_info->addrlen); 420 key.addrlen = reply_info->addrlen; 421 verbose(VERB_ALGO, "Incoming reply id = %4.4x", key.id); 422 log_addr(VERB_ALGO, "Incoming reply addr =", 423 &reply_info->addr, reply_info->addrlen); 424 425 /* find it, see if this thing is a valid query response */ 426 verbose(VERB_ALGO, "lookup size is %d entries", (int)outnet->pending->count); 427 p = (struct pending*)rbtree_search(outnet->pending, &key); 428 if(!p) { 429 verbose(VERB_QUERY, "received unwanted or unsolicited udp reply dropped."); 430 log_buf(VERB_ALGO, "dropped message", c->buffer); 431 outnet->unwanted_replies++; 432 if(outnet->unwanted_threshold && ++outnet->unwanted_total 433 >= outnet->unwanted_threshold) { 434 log_warn("unwanted reply total reached threshold (%u)" 435 " you may be under attack." 436 " defensive action: clearing the cache", 437 (unsigned)outnet->unwanted_threshold); 438 fptr_ok(fptr_whitelist_alloc_cleanup( 439 outnet->unwanted_action)); 440 (*outnet->unwanted_action)(outnet->unwanted_param); 441 outnet->unwanted_total = 0; 442 } 443 return 0; 444 } 445 446 verbose(VERB_ALGO, "received udp reply."); 447 log_buf(VERB_ALGO, "udp message", c->buffer); 448 if(p->pc->cp != c) { 449 verbose(VERB_QUERY, "received reply id,addr on wrong port. " 450 "dropped."); 451 outnet->unwanted_replies++; 452 if(outnet->unwanted_threshold && ++outnet->unwanted_total 453 >= outnet->unwanted_threshold) { 454 log_warn("unwanted reply total reached threshold (%u)" 455 " you may be under attack." 456 " defensive action: clearing the cache", 457 (unsigned)outnet->unwanted_threshold); 458 fptr_ok(fptr_whitelist_alloc_cleanup( 459 outnet->unwanted_action)); 460 (*outnet->unwanted_action)(outnet->unwanted_param); 461 outnet->unwanted_total = 0; 462 } 463 return 0; 464 } 465 comm_timer_disable(p->timer); 466 verbose(VERB_ALGO, "outnet handle udp reply"); 467 /* delete from tree first in case callback creates a retry */ 468 (void)rbtree_delete(outnet->pending, p->node.key); 469 if(p->cb) { 470 fptr_ok(fptr_whitelist_pending_udp(p->cb)); 471 (void)(*p->cb)(p->pc->cp, p->cb_arg, NETEVENT_NOERROR, reply_info); 472 } 473 portcomm_loweruse(outnet, p->pc); 474 pending_delete(NULL, p); 475 outnet_send_wait_udp(outnet); 476 return 0; 477} 478 479/** calculate number of ip4 and ip6 interfaces*/ 480static void 481calc_num46(char** ifs, int num_ifs, int do_ip4, int do_ip6, 482 int* num_ip4, int* num_ip6) 483{ 484 int i; 485 *num_ip4 = 0; 486 *num_ip6 = 0; 487 if(num_ifs <= 0) { 488 if(do_ip4) 489 *num_ip4 = 1; 490 if(do_ip6) 491 *num_ip6 = 1; 492 return; 493 } 494 for(i=0; i<num_ifs; i++) 495 { 496 if(str_is_ip6(ifs[i])) { 497 if(do_ip6) 498 (*num_ip6)++; 499 } else { 500 if(do_ip4) 501 (*num_ip4)++; 502 } 503 } 504 505} 506 507void 508pending_udp_timer_delay_cb(void* arg) 509{ 510 struct pending* p = (struct pending*)arg; 511 struct outside_network* outnet = p->outnet; 512 verbose(VERB_ALGO, "timeout udp with delay"); 513 portcomm_loweruse(outnet, p->pc); 514 pending_delete(outnet, p); 515 outnet_send_wait_udp(outnet); 516} 517 518void 519pending_udp_timer_cb(void *arg) 520{ 521 struct pending* p = (struct pending*)arg; 522 struct outside_network* outnet = p->outnet; 523 /* it timed out */ 524 verbose(VERB_ALGO, "timeout udp"); 525 if(p->cb) { 526 fptr_ok(fptr_whitelist_pending_udp(p->cb)); 527 (void)(*p->cb)(p->pc->cp, p->cb_arg, NETEVENT_TIMEOUT, NULL); 528 } 529 /* if delayclose, keep port open for a longer time. 530 * But if the udpwaitlist exists, then we are struggling to 531 * keep up with demand for sockets, so do not wait, but service 532 * the customer (customer service more important than portICMPs) */ 533 if(outnet->delayclose && !outnet->udp_wait_first) { 534 p->cb = NULL; 535 p->timer->callback = &pending_udp_timer_delay_cb; 536 comm_timer_set(p->timer, &outnet->delay_tv); 537 return; 538 } 539 portcomm_loweruse(outnet, p->pc); 540 pending_delete(outnet, p); 541 outnet_send_wait_udp(outnet); 542} 543 544/** create pending_tcp buffers */ 545static int 546create_pending_tcp(struct outside_network* outnet, size_t bufsize) 547{ 548 size_t i; 549 if(outnet->num_tcp == 0) 550 return 1; /* no tcp needed, nothing to do */ 551 if(!(outnet->tcp_conns = (struct pending_tcp **)calloc( 552 outnet->num_tcp, sizeof(struct pending_tcp*)))) 553 return 0; 554 for(i=0; i<outnet->num_tcp; i++) { 555 if(!(outnet->tcp_conns[i] = (struct pending_tcp*)calloc(1, 556 sizeof(struct pending_tcp)))) 557 return 0; 558 outnet->tcp_conns[i]->next_free = outnet->tcp_free; 559 outnet->tcp_free = outnet->tcp_conns[i]; 560 outnet->tcp_conns[i]->c = comm_point_create_tcp_out( 561 outnet->base, bufsize, outnet_tcp_cb, 562 outnet->tcp_conns[i]); 563 if(!outnet->tcp_conns[i]->c) 564 return 0; 565 } 566 return 1; 567} 568 569/** setup an outgoing interface, ready address */ 570static int setup_if(struct port_if* pif, const char* addrstr, 571 int* avail, int numavail, size_t numfd) 572{ 573 pif->avail_total = numavail; 574 pif->avail_ports = (int*)memdup(avail, (size_t)numavail*sizeof(int)); 575 if(!pif->avail_ports) 576 return 0; 577 if(!ipstrtoaddr(addrstr, UNBOUND_DNS_PORT, &pif->addr, &pif->addrlen)) 578 return 0; 579 pif->maxout = (int)numfd; 580 pif->inuse = 0; 581 pif->out = (struct port_comm**)calloc(numfd, 582 sizeof(struct port_comm*)); 583 if(!pif->out) 584 return 0; 585 return 1; 586} 587 588struct outside_network* 589outside_network_create(struct comm_base *base, size_t bufsize, 590 size_t num_ports, char** ifs, int num_ifs, int do_ip4, 591 int do_ip6, size_t num_tcp, struct infra_cache* infra, 592 struct ub_randstate* rnd, int use_caps_for_id, int* availports, 593 int numavailports, size_t unwanted_threshold, 594 void (*unwanted_action)(void*), void* unwanted_param, int do_udp, 595 void* sslctx, int delayclose, struct dt_env* dtenv) 596{ 597 struct outside_network* outnet = (struct outside_network*) 598 calloc(1, sizeof(struct outside_network)); 599 size_t k; 600 if(!outnet) { 601 log_err("malloc failed"); 602 return NULL; 603 } 604 comm_base_timept(base, &outnet->now_secs, &outnet->now_tv); 605 outnet->base = base; 606 outnet->num_tcp = num_tcp; 607 outnet->num_tcp_outgoing = 0; 608 outnet->infra = infra; 609 outnet->rnd = rnd; 610 outnet->sslctx = sslctx; 611#ifdef USE_DNSTAP 612 outnet->dtenv = dtenv; 613#else 614 (void)dtenv; 615#endif 616 outnet->svcd_overhead = 0; 617 outnet->want_to_quit = 0; 618 outnet->unwanted_threshold = unwanted_threshold; 619 outnet->unwanted_action = unwanted_action; 620 outnet->unwanted_param = unwanted_param; 621 outnet->use_caps_for_id = use_caps_for_id; 622 outnet->do_udp = do_udp; 623#ifndef S_SPLINT_S 624 if(delayclose) { 625 outnet->delayclose = 1; 626 outnet->delay_tv.tv_sec = delayclose/1000; 627 outnet->delay_tv.tv_usec = (delayclose%1000)*1000; 628 } 629#endif 630 if(numavailports == 0) { 631 log_err("no outgoing ports available"); 632 outside_network_delete(outnet); 633 return NULL; 634 } 635#ifndef INET6 636 do_ip6 = 0; 637#endif 638 calc_num46(ifs, num_ifs, do_ip4, do_ip6, 639 &outnet->num_ip4, &outnet->num_ip6); 640 if(outnet->num_ip4 != 0) { 641 if(!(outnet->ip4_ifs = (struct port_if*)calloc( 642 (size_t)outnet->num_ip4, sizeof(struct port_if)))) { 643 log_err("malloc failed"); 644 outside_network_delete(outnet); 645 return NULL; 646 } 647 } 648 if(outnet->num_ip6 != 0) { 649 if(!(outnet->ip6_ifs = (struct port_if*)calloc( 650 (size_t)outnet->num_ip6, sizeof(struct port_if)))) { 651 log_err("malloc failed"); 652 outside_network_delete(outnet); 653 return NULL; 654 } 655 } 656 if( !(outnet->udp_buff = sldns_buffer_new(bufsize)) || 657 !(outnet->pending = rbtree_create(pending_cmp)) || 658 !(outnet->serviced = rbtree_create(serviced_cmp)) || 659 !create_pending_tcp(outnet, bufsize)) { 660 log_err("malloc failed"); 661 outside_network_delete(outnet); 662 return NULL; 663 } 664 665 /* allocate commpoints */ 666 for(k=0; k<num_ports; k++) { 667 struct port_comm* pc; 668 pc = (struct port_comm*)calloc(1, sizeof(*pc)); 669 if(!pc) { 670 log_err("malloc failed"); 671 outside_network_delete(outnet); 672 return NULL; 673 } 674 pc->cp = comm_point_create_udp(outnet->base, -1, 675 outnet->udp_buff, outnet_udp_cb, outnet); 676 if(!pc->cp) { 677 log_err("malloc failed"); 678 free(pc); 679 outside_network_delete(outnet); 680 return NULL; 681 } 682 pc->next = outnet->unused_fds; 683 outnet->unused_fds = pc; 684 } 685 686 /* allocate interfaces */ 687 if(num_ifs == 0) { 688 if(do_ip4 && !setup_if(&outnet->ip4_ifs[0], "0.0.0.0", 689 availports, numavailports, num_ports)) { 690 log_err("malloc failed"); 691 outside_network_delete(outnet); 692 return NULL; 693 } 694 if(do_ip6 && !setup_if(&outnet->ip6_ifs[0], "::", 695 availports, numavailports, num_ports)) { 696 log_err("malloc failed"); 697 outside_network_delete(outnet); 698 return NULL; 699 } 700 } else { 701 size_t done_4 = 0, done_6 = 0; 702 int i; 703 for(i=0; i<num_ifs; i++) { 704 if(str_is_ip6(ifs[i]) && do_ip6) { 705 if(!setup_if(&outnet->ip6_ifs[done_6], ifs[i], 706 availports, numavailports, num_ports)){ 707 log_err("malloc failed"); 708 outside_network_delete(outnet); 709 return NULL; 710 } 711 done_6++; 712 } 713 if(!str_is_ip6(ifs[i]) && do_ip4) { 714 if(!setup_if(&outnet->ip4_ifs[done_4], ifs[i], 715 availports, numavailports, num_ports)){ 716 log_err("malloc failed"); 717 outside_network_delete(outnet); 718 return NULL; 719 } 720 done_4++; 721 } 722 } 723 } 724 return outnet; 725} 726 727/** helper pending delete */ 728static void 729pending_node_del(rbnode_t* node, void* arg) 730{ 731 struct pending* pend = (struct pending*)node; 732 struct outside_network* outnet = (struct outside_network*)arg; 733 pending_delete(outnet, pend); 734} 735 736/** helper serviced delete */ 737static void 738serviced_node_del(rbnode_t* node, void* ATTR_UNUSED(arg)) 739{ 740 struct serviced_query* sq = (struct serviced_query*)node; 741 struct service_callback* p = sq->cblist, *np; 742 free(sq->qbuf); 743 free(sq->zone); 744 while(p) { 745 np = p->next; 746 free(p); 747 p = np; 748 } 749 free(sq); 750} 751 752void 753outside_network_quit_prepare(struct outside_network* outnet) 754{ 755 if(!outnet) 756 return; 757 /* prevent queued items from being sent */ 758 outnet->want_to_quit = 1; 759} 760 761void 762outside_network_delete(struct outside_network* outnet) 763{ 764 if(!outnet) 765 return; 766 outnet->want_to_quit = 1; 767 /* check every element, since we can be called on malloc error */ 768 if(outnet->pending) { 769 /* free pending elements, but do no unlink from tree. */ 770 traverse_postorder(outnet->pending, pending_node_del, NULL); 771 free(outnet->pending); 772 } 773 if(outnet->serviced) { 774 traverse_postorder(outnet->serviced, serviced_node_del, NULL); 775 free(outnet->serviced); 776 } 777 if(outnet->udp_buff) 778 sldns_buffer_free(outnet->udp_buff); 779 if(outnet->unused_fds) { 780 struct port_comm* p = outnet->unused_fds, *np; 781 while(p) { 782 np = p->next; 783 comm_point_delete(p->cp); 784 free(p); 785 p = np; 786 } 787 outnet->unused_fds = NULL; 788 } 789 if(outnet->ip4_ifs) { 790 int i, k; 791 for(i=0; i<outnet->num_ip4; i++) { 792 for(k=0; k<outnet->ip4_ifs[i].inuse; k++) { 793 struct port_comm* pc = outnet->ip4_ifs[i]. 794 out[k]; 795 comm_point_delete(pc->cp); 796 free(pc); 797 } 798 free(outnet->ip4_ifs[i].avail_ports); 799 free(outnet->ip4_ifs[i].out); 800 } 801 free(outnet->ip4_ifs); 802 } 803 if(outnet->ip6_ifs) { 804 int i, k; 805 for(i=0; i<outnet->num_ip6; i++) { 806 for(k=0; k<outnet->ip6_ifs[i].inuse; k++) { 807 struct port_comm* pc = outnet->ip6_ifs[i]. 808 out[k]; 809 comm_point_delete(pc->cp); 810 free(pc); 811 } 812 free(outnet->ip6_ifs[i].avail_ports); 813 free(outnet->ip6_ifs[i].out); 814 } 815 free(outnet->ip6_ifs); 816 } 817 if(outnet->tcp_conns) { 818 size_t i; 819 for(i=0; i<outnet->num_tcp; i++) 820 if(outnet->tcp_conns[i]) { 821 comm_point_delete(outnet->tcp_conns[i]->c); 822 waiting_tcp_delete(outnet->tcp_conns[i]->query); 823 free(outnet->tcp_conns[i]); 824 } 825 free(outnet->tcp_conns); 826 } 827 if(outnet->tcp_wait_first) { 828 struct waiting_tcp* p = outnet->tcp_wait_first, *np; 829 while(p) { 830 np = p->next_waiting; 831 waiting_tcp_delete(p); 832 p = np; 833 } 834 } 835 if(outnet->udp_wait_first) { 836 struct pending* p = outnet->udp_wait_first, *np; 837 while(p) { 838 np = p->next_waiting; 839 pending_delete(NULL, p); 840 p = np; 841 } 842 } 843 free(outnet); 844} 845 846void 847pending_delete(struct outside_network* outnet, struct pending* p) 848{ 849 if(!p) 850 return; 851 if(outnet && outnet->udp_wait_first && 852 (p->next_waiting || p == outnet->udp_wait_last) ) { 853 /* delete from waiting list, if it is in the waiting list */ 854 struct pending* prev = NULL, *x = outnet->udp_wait_first; 855 while(x && x != p) { 856 prev = x; 857 x = x->next_waiting; 858 } 859 if(x) { 860 log_assert(x == p); 861 if(prev) 862 prev->next_waiting = p->next_waiting; 863 else outnet->udp_wait_first = p->next_waiting; 864 if(outnet->udp_wait_last == p) 865 outnet->udp_wait_last = prev; 866 } 867 } 868 if(outnet) { 869 (void)rbtree_delete(outnet->pending, p->node.key); 870 } 871 if(p->timer) 872 comm_timer_delete(p->timer); 873 free(p->pkt); 874 free(p); 875} 876 877/** 878 * Try to open a UDP socket for outgoing communication. 879 * Sets sockets options as needed. 880 * @param addr: socket address. 881 * @param addrlen: length of address. 882 * @param port: port override for addr. 883 * @param inuse: if -1 is returned, this bool means the port was in use. 884 * @return fd or -1 885 */ 886static int 887udp_sockport(struct sockaddr_storage* addr, socklen_t addrlen, int port, 888 int* inuse) 889{ 890 int fd, noproto; 891 if(addr_is_ip6(addr, addrlen)) { 892 struct sockaddr_in6* sa = (struct sockaddr_in6*)addr; 893 sa->sin6_port = (in_port_t)htons((uint16_t)port); 894 fd = create_udp_sock(AF_INET6, SOCK_DGRAM, 895 (struct sockaddr*)addr, addrlen, 1, inuse, &noproto, 896 0, 0, 0, NULL, 0); 897 } else { 898 struct sockaddr_in* sa = (struct sockaddr_in*)addr; 899 sa->sin_port = (in_port_t)htons((uint16_t)port); 900 fd = create_udp_sock(AF_INET, SOCK_DGRAM, 901 (struct sockaddr*)addr, addrlen, 1, inuse, &noproto, 902 0, 0, 0, NULL, 0); 903 } 904 return fd; 905} 906 907/** Select random ID */ 908static int 909select_id(struct outside_network* outnet, struct pending* pend, 910 sldns_buffer* packet) 911{ 912 int id_tries = 0; 913 pend->id = ((unsigned)ub_random(outnet->rnd)>>8) & 0xffff; 914 LDNS_ID_SET(sldns_buffer_begin(packet), pend->id); 915 916 /* insert in tree */ 917 pend->node.key = pend; 918 while(!rbtree_insert(outnet->pending, &pend->node)) { 919 /* change ID to avoid collision */ 920 pend->id = ((unsigned)ub_random(outnet->rnd)>>8) & 0xffff; 921 LDNS_ID_SET(sldns_buffer_begin(packet), pend->id); 922 id_tries++; 923 if(id_tries == MAX_ID_RETRY) { 924 pend->id=99999; /* non existant ID */ 925 log_err("failed to generate unique ID, drop msg"); 926 return 0; 927 } 928 } 929 verbose(VERB_ALGO, "inserted new pending reply id=%4.4x", pend->id); 930 return 1; 931} 932 933/** Select random interface and port */ 934static int 935select_ifport(struct outside_network* outnet, struct pending* pend, 936 int num_if, struct port_if* ifs) 937{ 938 int my_if, my_port, fd, portno, inuse, tries=0; 939 struct port_if* pif; 940 /* randomly select interface and port */ 941 if(num_if == 0) { 942 verbose(VERB_QUERY, "Need to send query but have no " 943 "outgoing interfaces of that family"); 944 return 0; 945 } 946 log_assert(outnet->unused_fds); 947 tries = 0; 948 while(1) { 949 my_if = ub_random_max(outnet->rnd, num_if); 950 pif = &ifs[my_if]; 951 my_port = ub_random_max(outnet->rnd, pif->avail_total); 952 if(my_port < pif->inuse) { 953 /* port already open */ 954 pend->pc = pif->out[my_port]; 955 verbose(VERB_ALGO, "using UDP if=%d port=%d", 956 my_if, pend->pc->number); 957 break; 958 } 959 /* try to open new port, if fails, loop to try again */ 960 log_assert(pif->inuse < pif->maxout); 961 portno = pif->avail_ports[my_port - pif->inuse]; 962 fd = udp_sockport(&pif->addr, pif->addrlen, portno, &inuse); 963 if(fd == -1 && !inuse) { 964 /* nonrecoverable error making socket */ 965 return 0; 966 } 967 if(fd != -1) { 968 verbose(VERB_ALGO, "opened UDP if=%d port=%d", 969 my_if, portno); 970 /* grab fd */ 971 pend->pc = outnet->unused_fds; 972 outnet->unused_fds = pend->pc->next; 973 974 /* setup portcomm */ 975 pend->pc->next = NULL; 976 pend->pc->number = portno; 977 pend->pc->pif = pif; 978 pend->pc->index = pif->inuse; 979 pend->pc->num_outstanding = 0; 980 comm_point_start_listening(pend->pc->cp, fd, -1); 981 982 /* grab port in interface */ 983 pif->out[pif->inuse] = pend->pc; 984 pif->avail_ports[my_port - pif->inuse] = 985 pif->avail_ports[pif->avail_total-pif->inuse-1]; 986 pif->inuse++; 987 break; 988 } 989 /* failed, already in use */ 990 verbose(VERB_QUERY, "port %d in use, trying another", portno); 991 tries++; 992 if(tries == MAX_PORT_RETRY) { 993 log_err("failed to find an open port, drop msg"); 994 return 0; 995 } 996 } 997 log_assert(pend->pc); 998 pend->pc->num_outstanding++; 999 1000 return 1; 1001} 1002 1003static int 1004randomize_and_send_udp(struct pending* pend, sldns_buffer* packet, int timeout) 1005{ 1006 struct timeval tv; 1007 struct outside_network* outnet = pend->sq->outnet; 1008 1009 /* select id */ 1010 if(!select_id(outnet, pend, packet)) { 1011 return 0; 1012 } 1013 1014 /* select src_if, port */ 1015 if(addr_is_ip6(&pend->addr, pend->addrlen)) { 1016 if(!select_ifport(outnet, pend, 1017 outnet->num_ip6, outnet->ip6_ifs)) 1018 return 0; 1019 } else { 1020 if(!select_ifport(outnet, pend, 1021 outnet->num_ip4, outnet->ip4_ifs)) 1022 return 0; 1023 } 1024 log_assert(pend->pc && pend->pc->cp); 1025 1026 /* send it over the commlink */ 1027 if(!comm_point_send_udp_msg(pend->pc->cp, packet, 1028 (struct sockaddr*)&pend->addr, pend->addrlen)) { 1029 portcomm_loweruse(outnet, pend->pc); 1030 return 0; 1031 } 1032 1033 /* system calls to set timeout after sending UDP to make roundtrip 1034 smaller. */ 1035#ifndef S_SPLINT_S 1036 tv.tv_sec = timeout/1000; 1037 tv.tv_usec = (timeout%1000)*1000; 1038#endif 1039 comm_timer_set(pend->timer, &tv); 1040 1041#ifdef USE_DNSTAP 1042 if(outnet->dtenv && 1043 (outnet->dtenv->log_resolver_query_messages || 1044 outnet->dtenv->log_forwarder_query_messages)) 1045 dt_msg_send_outside_query(outnet->dtenv, &pend->addr, comm_udp, 1046 pend->sq->zone, pend->sq->zonelen, packet); 1047#endif 1048 return 1; 1049} 1050 1051struct pending* 1052pending_udp_query(struct serviced_query* sq, struct sldns_buffer* packet, 1053 int timeout, comm_point_callback_t* cb, void* cb_arg) 1054{ 1055 struct pending* pend = (struct pending*)calloc(1, sizeof(*pend)); 1056 if(!pend) return NULL; 1057 pend->outnet = sq->outnet; 1058 pend->sq = sq; 1059 pend->addrlen = sq->addrlen; 1060 memmove(&pend->addr, &sq->addr, sq->addrlen); 1061 pend->cb = cb; 1062 pend->cb_arg = cb_arg; 1063 pend->node.key = pend; 1064 pend->timer = comm_timer_create(sq->outnet->base, pending_udp_timer_cb, 1065 pend); 1066 if(!pend->timer) { 1067 free(pend); 1068 return NULL; 1069 } 1070 1071 if(sq->outnet->unused_fds == NULL) { 1072 /* no unused fd, cannot create a new port (randomly) */ 1073 verbose(VERB_ALGO, "no fds available, udp query waiting"); 1074 pend->timeout = timeout; 1075 pend->pkt_len = sldns_buffer_limit(packet); 1076 pend->pkt = (uint8_t*)memdup(sldns_buffer_begin(packet), 1077 pend->pkt_len); 1078 if(!pend->pkt) { 1079 comm_timer_delete(pend->timer); 1080 free(pend); 1081 return NULL; 1082 } 1083 /* put at end of waiting list */ 1084 if(sq->outnet->udp_wait_last) 1085 sq->outnet->udp_wait_last->next_waiting = pend; 1086 else 1087 sq->outnet->udp_wait_first = pend; 1088 sq->outnet->udp_wait_last = pend; 1089 return pend; 1090 } 1091 if(!randomize_and_send_udp(pend, packet, timeout)) { 1092 pending_delete(sq->outnet, pend); 1093 return NULL; 1094 } 1095 return pend; 1096} 1097 1098void 1099outnet_tcptimer(void* arg) 1100{ 1101 struct waiting_tcp* w = (struct waiting_tcp*)arg; 1102 struct outside_network* outnet = w->outnet; 1103 comm_point_callback_t* cb; 1104 void* cb_arg; 1105 if(w->pkt) { 1106 /* it is on the waiting list */ 1107 waiting_list_remove(outnet, w); 1108 } else { 1109 /* it was in use */ 1110 struct pending_tcp* pend=(struct pending_tcp*)w->next_waiting; 1111 comm_point_close(pend->c); 1112 pend->query = NULL; 1113 pend->next_free = outnet->tcp_free; 1114 outnet->tcp_free = pend; 1115 } 1116 cb = w->cb; 1117 cb_arg = w->cb_arg; 1118 waiting_tcp_delete(w); 1119 fptr_ok(fptr_whitelist_pending_tcp(cb)); 1120 (void)(*cb)(NULL, cb_arg, NETEVENT_TIMEOUT, NULL); 1121 use_free_buffer(outnet); 1122} 1123 1124struct waiting_tcp* 1125pending_tcp_query(struct serviced_query* sq, sldns_buffer* packet, 1126 int timeout, comm_point_callback_t* callback, void* callback_arg) 1127{ 1128 struct pending_tcp* pend = sq->outnet->tcp_free; 1129 struct waiting_tcp* w; 1130 struct timeval tv; 1131 uint16_t id; 1132 /* if no buffer is free allocate space to store query */ 1133 w = (struct waiting_tcp*)malloc(sizeof(struct waiting_tcp) 1134 + (pend?0:sldns_buffer_limit(packet))); 1135 if(!w) { 1136 return NULL; 1137 } 1138 if(!(w->timer = comm_timer_create(sq->outnet->base, outnet_tcptimer, w))) { 1139 free(w); 1140 return NULL; 1141 } 1142 w->pkt = NULL; 1143 w->pkt_len = 0; 1144 id = ((unsigned)ub_random(sq->outnet->rnd)>>8) & 0xffff; 1145 LDNS_ID_SET(sldns_buffer_begin(packet), id); 1146 memcpy(&w->addr, &sq->addr, sq->addrlen); 1147 w->addrlen = sq->addrlen; 1148 w->outnet = sq->outnet; 1149 w->cb = callback; 1150 w->cb_arg = callback_arg; 1151 w->ssl_upstream = sq->ssl_upstream; 1152#ifndef S_SPLINT_S 1153 tv.tv_sec = timeout; 1154 tv.tv_usec = 0; 1155#endif 1156 comm_timer_set(w->timer, &tv); 1157 if(pend) { 1158 /* we have a buffer available right now */ 1159 if(!outnet_tcp_take_into_use(w, sldns_buffer_begin(packet), 1160 sldns_buffer_limit(packet))) { 1161 waiting_tcp_delete(w); 1162 return NULL; 1163 } 1164#ifdef USE_DNSTAP 1165 if(sq->outnet->dtenv && 1166 (sq->outnet->dtenv->log_resolver_query_messages || 1167 sq->outnet->dtenv->log_forwarder_query_messages)) 1168 dt_msg_send_outside_query(sq->outnet->dtenv, &sq->addr, 1169 comm_tcp, sq->zone, sq->zonelen, packet); 1170#endif 1171 } else { 1172 /* queue up */ 1173 w->pkt = (uint8_t*)w + sizeof(struct waiting_tcp); 1174 w->pkt_len = sldns_buffer_limit(packet); 1175 memmove(w->pkt, sldns_buffer_begin(packet), w->pkt_len); 1176 w->next_waiting = NULL; 1177 if(sq->outnet->tcp_wait_last) 1178 sq->outnet->tcp_wait_last->next_waiting = w; 1179 else sq->outnet->tcp_wait_first = w; 1180 sq->outnet->tcp_wait_last = w; 1181 } 1182 return w; 1183} 1184 1185/** create query for serviced queries */ 1186static void 1187serviced_gen_query(sldns_buffer* buff, uint8_t* qname, size_t qnamelen, 1188 uint16_t qtype, uint16_t qclass, uint16_t flags) 1189{ 1190 sldns_buffer_clear(buff); 1191 /* skip id */ 1192 sldns_buffer_write_u16(buff, flags); 1193 sldns_buffer_write_u16(buff, 1); /* qdcount */ 1194 sldns_buffer_write_u16(buff, 0); /* ancount */ 1195 sldns_buffer_write_u16(buff, 0); /* nscount */ 1196 sldns_buffer_write_u16(buff, 0); /* arcount */ 1197 sldns_buffer_write(buff, qname, qnamelen); 1198 sldns_buffer_write_u16(buff, qtype); 1199 sldns_buffer_write_u16(buff, qclass); 1200 sldns_buffer_flip(buff); 1201} 1202 1203/** lookup serviced query in serviced query rbtree */ 1204static struct serviced_query* 1205lookup_serviced(struct outside_network* outnet, sldns_buffer* buff, int dnssec, 1206 struct sockaddr_storage* addr, socklen_t addrlen) 1207{ 1208 struct serviced_query key; 1209 key.node.key = &key; 1210 key.qbuf = sldns_buffer_begin(buff); 1211 key.qbuflen = sldns_buffer_limit(buff); 1212 key.dnssec = dnssec; 1213 memcpy(&key.addr, addr, addrlen); 1214 key.addrlen = addrlen; 1215 key.outnet = outnet; 1216 return (struct serviced_query*)rbtree_search(outnet->serviced, &key); 1217} 1218 1219/** Create new serviced entry */ 1220static struct serviced_query* 1221serviced_create(struct outside_network* outnet, sldns_buffer* buff, int dnssec, 1222 int want_dnssec, int nocaps, int tcp_upstream, int ssl_upstream, 1223 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone, 1224 size_t zonelen, int qtype) 1225{ 1226 struct serviced_query* sq = (struct serviced_query*)malloc(sizeof(*sq)); 1227#ifdef UNBOUND_DEBUG 1228 rbnode_t* ins; 1229#endif 1230 if(!sq) 1231 return NULL; 1232 sq->node.key = sq; 1233 sq->qbuf = memdup(sldns_buffer_begin(buff), sldns_buffer_limit(buff)); 1234 if(!sq->qbuf) { 1235 free(sq); 1236 return NULL; 1237 } 1238 sq->qbuflen = sldns_buffer_limit(buff); 1239 sq->zone = memdup(zone, zonelen); 1240 if(!sq->zone) { 1241 free(sq->qbuf); 1242 free(sq); 1243 return NULL; 1244 } 1245 sq->zonelen = zonelen; 1246 sq->qtype = qtype; 1247 sq->dnssec = dnssec; 1248 sq->want_dnssec = want_dnssec; 1249 sq->nocaps = nocaps; 1250 sq->tcp_upstream = tcp_upstream; 1251 sq->ssl_upstream = ssl_upstream; 1252 memcpy(&sq->addr, addr, addrlen); 1253 sq->addrlen = addrlen; 1254 sq->outnet = outnet; 1255 sq->cblist = NULL; 1256 sq->pending = NULL; 1257 sq->status = serviced_initial; 1258 sq->retry = 0; 1259 sq->to_be_deleted = 0; 1260#ifdef UNBOUND_DEBUG 1261 ins = 1262#else 1263 (void) 1264#endif 1265 rbtree_insert(outnet->serviced, &sq->node); 1266 log_assert(ins != NULL); /* must not be already present */ 1267 return sq; 1268} 1269 1270/** remove waiting tcp from the outnet waiting list */ 1271static void 1272waiting_list_remove(struct outside_network* outnet, struct waiting_tcp* w) 1273{ 1274 struct waiting_tcp* p = outnet->tcp_wait_first, *prev = NULL; 1275 while(p) { 1276 if(p == w) { 1277 /* remove w */ 1278 if(prev) 1279 prev->next_waiting = w->next_waiting; 1280 else outnet->tcp_wait_first = w->next_waiting; 1281 if(outnet->tcp_wait_last == w) 1282 outnet->tcp_wait_last = prev; 1283 return; 1284 } 1285 prev = p; 1286 p = p->next_waiting; 1287 } 1288} 1289 1290/** cleanup serviced query entry */ 1291static void 1292serviced_delete(struct serviced_query* sq) 1293{ 1294 if(sq->pending) { 1295 /* clear up the pending query */ 1296 if(sq->status == serviced_query_UDP_EDNS || 1297 sq->status == serviced_query_UDP || 1298 sq->status == serviced_query_PROBE_EDNS || 1299 sq->status == serviced_query_UDP_EDNS_FRAG || 1300 sq->status == serviced_query_UDP_EDNS_fallback) { 1301 struct pending* p = (struct pending*)sq->pending; 1302 if(p->pc) 1303 portcomm_loweruse(sq->outnet, p->pc); 1304 pending_delete(sq->outnet, p); 1305 /* this call can cause reentrant calls back into the 1306 * mesh */ 1307 outnet_send_wait_udp(sq->outnet); 1308 } else { 1309 struct waiting_tcp* p = (struct waiting_tcp*) 1310 sq->pending; 1311 if(p->pkt == NULL) { 1312 decomission_pending_tcp(sq->outnet, 1313 (struct pending_tcp*)p->next_waiting); 1314 } else { 1315 waiting_list_remove(sq->outnet, p); 1316 waiting_tcp_delete(p); 1317 } 1318 } 1319 } 1320 /* does not delete from tree, caller has to do that */ 1321 serviced_node_del(&sq->node, NULL); 1322} 1323 1324/** perturb a dname capitalization randomly */ 1325static void 1326serviced_perturb_qname(struct ub_randstate* rnd, uint8_t* qbuf, size_t len) 1327{ 1328 uint8_t lablen; 1329 uint8_t* d = qbuf + 10; 1330 long int random = 0; 1331 int bits = 0; 1332 log_assert(len >= 10 + 5 /* offset qname, root, qtype, qclass */); 1333 lablen = *d++; 1334 while(lablen) { 1335 while(lablen--) { 1336 /* only perturb A-Z, a-z */ 1337 if(isalpha((unsigned char)*d)) { 1338 /* get a random bit */ 1339 if(bits == 0) { 1340 random = ub_random(rnd); 1341 bits = 30; 1342 } 1343 if(random & 0x1) { 1344 *d = (uint8_t)toupper((unsigned char)*d); 1345 } else { 1346 *d = (uint8_t)tolower((unsigned char)*d); 1347 } 1348 random >>= 1; 1349 bits--; 1350 } 1351 d++; 1352 } 1353 lablen = *d++; 1354 } 1355 if(verbosity >= VERB_ALGO) { 1356 char buf[LDNS_MAX_DOMAINLEN+1]; 1357 dname_str(qbuf+10, buf); 1358 verbose(VERB_ALGO, "qname perturbed to %s", buf); 1359 } 1360} 1361 1362/** put serviced query into a buffer */ 1363static void 1364serviced_encode(struct serviced_query* sq, sldns_buffer* buff, int with_edns) 1365{ 1366 /* if we are using 0x20 bits for ID randomness, perturb them */ 1367 if(sq->outnet->use_caps_for_id && !sq->nocaps) { 1368 serviced_perturb_qname(sq->outnet->rnd, sq->qbuf, sq->qbuflen); 1369 } 1370 /* generate query */ 1371 sldns_buffer_clear(buff); 1372 sldns_buffer_write_u16(buff, 0); /* id placeholder */ 1373 sldns_buffer_write(buff, sq->qbuf, sq->qbuflen); 1374 sldns_buffer_flip(buff); 1375 if(with_edns) { 1376 /* add edns section */ 1377 struct edns_data edns; 1378 edns.edns_present = 1; 1379 edns.ext_rcode = 0; 1380 edns.edns_version = EDNS_ADVERTISED_VERSION; 1381 if(sq->status == serviced_query_UDP_EDNS_FRAG) { 1382 if(addr_is_ip6(&sq->addr, sq->addrlen)) { 1383 if(EDNS_FRAG_SIZE_IP6 < EDNS_ADVERTISED_SIZE) 1384 edns.udp_size = EDNS_FRAG_SIZE_IP6; 1385 else edns.udp_size = EDNS_ADVERTISED_SIZE; 1386 } else { 1387 if(EDNS_FRAG_SIZE_IP4 < EDNS_ADVERTISED_SIZE) 1388 edns.udp_size = EDNS_FRAG_SIZE_IP4; 1389 else edns.udp_size = EDNS_ADVERTISED_SIZE; 1390 } 1391 } else { 1392 edns.udp_size = EDNS_ADVERTISED_SIZE; 1393 } 1394 edns.bits = 0; 1395 if(sq->dnssec & EDNS_DO) 1396 edns.bits = EDNS_DO; 1397 if(sq->dnssec & BIT_CD) 1398 LDNS_CD_SET(sldns_buffer_begin(buff)); 1399 attach_edns_record(buff, &edns); 1400 } 1401} 1402 1403/** 1404 * Perform serviced query UDP sending operation. 1405 * Sends UDP with EDNS, unless infra host marked non EDNS. 1406 * @param sq: query to send. 1407 * @param buff: buffer scratch space. 1408 * @return 0 on error. 1409 */ 1410static int 1411serviced_udp_send(struct serviced_query* sq, sldns_buffer* buff) 1412{ 1413 int rtt, vs; 1414 uint8_t edns_lame_known; 1415 time_t now = *sq->outnet->now_secs; 1416 1417 if(!infra_host(sq->outnet->infra, &sq->addr, sq->addrlen, sq->zone, 1418 sq->zonelen, now, &vs, &edns_lame_known, &rtt)) 1419 return 0; 1420 sq->last_rtt = rtt; 1421 verbose(VERB_ALGO, "EDNS lookup known=%d vs=%d", edns_lame_known, vs); 1422 if(sq->status == serviced_initial) { 1423 if(edns_lame_known == 0 && rtt > 5000 && rtt < 10001) { 1424 /* perform EDNS lame probe - check if server is 1425 * EDNS lame (EDNS queries to it are dropped) */ 1426 verbose(VERB_ALGO, "serviced query: send probe to see " 1427 " if use of EDNS causes timeouts"); 1428 /* even 700 msec may be too small */ 1429 rtt = 1000; 1430 sq->status = serviced_query_PROBE_EDNS; 1431 } else if(vs != -1) { 1432 sq->status = serviced_query_UDP_EDNS; 1433 } else { 1434 sq->status = serviced_query_UDP; 1435 } 1436 } 1437 serviced_encode(sq, buff, (sq->status == serviced_query_UDP_EDNS) || 1438 (sq->status == serviced_query_UDP_EDNS_FRAG)); 1439 sq->last_sent_time = *sq->outnet->now_tv; 1440 sq->edns_lame_known = (int)edns_lame_known; 1441 verbose(VERB_ALGO, "serviced query UDP timeout=%d msec", rtt); 1442 sq->pending = pending_udp_query(sq, buff, rtt, 1443 serviced_udp_callback, sq); 1444 if(!sq->pending) 1445 return 0; 1446 return 1; 1447} 1448 1449/** check that perturbed qname is identical */ 1450static int 1451serviced_check_qname(sldns_buffer* pkt, uint8_t* qbuf, size_t qbuflen) 1452{ 1453 uint8_t* d1 = sldns_buffer_at(pkt, 12); 1454 uint8_t* d2 = qbuf+10; 1455 uint8_t len1, len2; 1456 int count = 0; 1457 log_assert(qbuflen >= 15 /* 10 header, root, type, class */); 1458 len1 = *d1++; 1459 len2 = *d2++; 1460 if(sldns_buffer_limit(pkt) < 12+1+4) /* packet too small for qname */ 1461 return 0; 1462 while(len1 != 0 || len2 != 0) { 1463 if(LABEL_IS_PTR(len1)) { 1464 d1 = sldns_buffer_at(pkt, PTR_OFFSET(len1, *d1)); 1465 if(d1 >= sldns_buffer_at(pkt, sldns_buffer_limit(pkt))) 1466 return 0; 1467 len1 = *d1++; 1468 if(count++ > MAX_COMPRESS_PTRS) 1469 return 0; 1470 continue; 1471 } 1472 if(d2 > qbuf+qbuflen) 1473 return 0; 1474 if(len1 != len2) 1475 return 0; 1476 if(len1 > LDNS_MAX_LABELLEN) 1477 return 0; 1478 log_assert(len1 <= LDNS_MAX_LABELLEN); 1479 log_assert(len2 <= LDNS_MAX_LABELLEN); 1480 log_assert(len1 == len2 && len1 != 0); 1481 /* compare the labels - bitwise identical */ 1482 if(memcmp(d1, d2, len1) != 0) 1483 return 0; 1484 d1 += len1; 1485 d2 += len2; 1486 len1 = *d1++; 1487 len2 = *d2++; 1488 } 1489 return 1; 1490} 1491 1492/** call the callbacks for a serviced query */ 1493static void 1494serviced_callbacks(struct serviced_query* sq, int error, struct comm_point* c, 1495 struct comm_reply* rep) 1496{ 1497 struct service_callback* p; 1498 int dobackup = (sq->cblist && sq->cblist->next); /* >1 cb*/ 1499 uint8_t *backup_p = NULL; 1500 size_t backlen = 0; 1501#ifdef UNBOUND_DEBUG 1502 rbnode_t* rem = 1503#else 1504 (void) 1505#endif 1506 /* remove from tree, and schedule for deletion, so that callbacks 1507 * can safely deregister themselves and even create new serviced 1508 * queries that are identical to this one. */ 1509 rbtree_delete(sq->outnet->serviced, sq); 1510 log_assert(rem); /* should have been present */ 1511 sq->to_be_deleted = 1; 1512 verbose(VERB_ALGO, "svcd callbacks start"); 1513 if(sq->outnet->use_caps_for_id && error == NETEVENT_NOERROR && c && 1514 !sq->nocaps) { 1515 /* noerror and nxdomain must have a qname in reply */ 1516 if(sldns_buffer_read_u16_at(c->buffer, 4) == 0 && 1517 (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) 1518 == LDNS_RCODE_NOERROR || 1519 LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) 1520 == LDNS_RCODE_NXDOMAIN)) { 1521 verbose(VERB_DETAIL, "no qname in reply to check 0x20ID"); 1522 log_addr(VERB_DETAIL, "from server", 1523 &sq->addr, sq->addrlen); 1524 log_buf(VERB_DETAIL, "for packet", c->buffer); 1525 error = NETEVENT_CLOSED; 1526 c = NULL; 1527 } else if(sldns_buffer_read_u16_at(c->buffer, 4) > 0 && 1528 !serviced_check_qname(c->buffer, sq->qbuf, 1529 sq->qbuflen)) { 1530 verbose(VERB_DETAIL, "wrong 0x20-ID in reply qname"); 1531 log_addr(VERB_DETAIL, "from server", 1532 &sq->addr, sq->addrlen); 1533 log_buf(VERB_DETAIL, "for packet", c->buffer); 1534 error = NETEVENT_CAPSFAIL; 1535 /* and cleanup too */ 1536 pkt_dname_tolower(c->buffer, 1537 sldns_buffer_at(c->buffer, 12)); 1538 } else { 1539 verbose(VERB_ALGO, "good 0x20-ID in reply qname"); 1540 /* cleanup caps, prettier cache contents. */ 1541 pkt_dname_tolower(c->buffer, 1542 sldns_buffer_at(c->buffer, 12)); 1543 } 1544 } 1545 if(dobackup && c) { 1546 /* make a backup of the query, since the querystate processing 1547 * may send outgoing queries that overwrite the buffer. 1548 * use secondary buffer to store the query. 1549 * This is a data copy, but faster than packet to server */ 1550 backlen = sldns_buffer_limit(c->buffer); 1551 backup_p = memdup(sldns_buffer_begin(c->buffer), backlen); 1552 if(!backup_p) { 1553 log_err("malloc failure in serviced query callbacks"); 1554 error = NETEVENT_CLOSED; 1555 c = NULL; 1556 } 1557 sq->outnet->svcd_overhead = backlen; 1558 } 1559 /* test the actual sq->cblist, because the next elem could be deleted*/ 1560 while((p=sq->cblist) != NULL) { 1561 sq->cblist = p->next; /* remove this element */ 1562 if(dobackup && c) { 1563 sldns_buffer_clear(c->buffer); 1564 sldns_buffer_write(c->buffer, backup_p, backlen); 1565 sldns_buffer_flip(c->buffer); 1566 } 1567 fptr_ok(fptr_whitelist_serviced_query(p->cb)); 1568 (void)(*p->cb)(c, p->cb_arg, error, rep); 1569 free(p); 1570 } 1571 if(backup_p) { 1572 free(backup_p); 1573 sq->outnet->svcd_overhead = 0; 1574 } 1575 verbose(VERB_ALGO, "svcd callbacks end"); 1576 log_assert(sq->cblist == NULL); 1577 serviced_delete(sq); 1578} 1579 1580int 1581serviced_tcp_callback(struct comm_point* c, void* arg, int error, 1582 struct comm_reply* rep) 1583{ 1584 struct serviced_query* sq = (struct serviced_query*)arg; 1585 struct comm_reply r2; 1586 sq->pending = NULL; /* removed after this callback */ 1587 if(error != NETEVENT_NOERROR) 1588 log_addr(VERB_QUERY, "tcp error for address", 1589 &sq->addr, sq->addrlen); 1590 if(error==NETEVENT_NOERROR) 1591 infra_update_tcp_works(sq->outnet->infra, &sq->addr, 1592 sq->addrlen, sq->zone, sq->zonelen); 1593#ifdef USE_DNSTAP 1594 if(error==NETEVENT_NOERROR && sq->outnet->dtenv && 1595 (sq->outnet->dtenv->log_resolver_response_messages || 1596 sq->outnet->dtenv->log_forwarder_response_messages)) 1597 dt_msg_send_outside_response(sq->outnet->dtenv, &sq->addr, 1598 c->type, sq->zone, sq->zonelen, sq->qbuf, sq->qbuflen, 1599 &sq->last_sent_time, sq->outnet->now_tv, c->buffer); 1600#endif 1601 if(error==NETEVENT_NOERROR && sq->status == serviced_query_TCP_EDNS && 1602 (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) == 1603 LDNS_RCODE_FORMERR || LDNS_RCODE_WIRE(sldns_buffer_begin( 1604 c->buffer)) == LDNS_RCODE_NOTIMPL) ) { 1605 /* attempt to fallback to nonEDNS */ 1606 sq->status = serviced_query_TCP_EDNS_fallback; 1607 serviced_tcp_initiate(sq, c->buffer); 1608 return 0; 1609 } else if(error==NETEVENT_NOERROR && 1610 sq->status == serviced_query_TCP_EDNS_fallback && 1611 (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) == 1612 LDNS_RCODE_NOERROR || LDNS_RCODE_WIRE( 1613 sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NXDOMAIN 1614 || LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) 1615 == LDNS_RCODE_YXDOMAIN)) { 1616 /* the fallback produced a result that looks promising, note 1617 * that this server should be approached without EDNS */ 1618 /* only store noEDNS in cache if domain is noDNSSEC */ 1619 if(!sq->want_dnssec) 1620 if(!infra_edns_update(sq->outnet->infra, &sq->addr, 1621 sq->addrlen, sq->zone, sq->zonelen, -1, 1622 *sq->outnet->now_secs)) 1623 log_err("Out of memory caching no edns for host"); 1624 sq->status = serviced_query_TCP; 1625 } 1626 if(sq->tcp_upstream || sq->ssl_upstream) { 1627 struct timeval now = *sq->outnet->now_tv; 1628 if(now.tv_sec > sq->last_sent_time.tv_sec || 1629 (now.tv_sec == sq->last_sent_time.tv_sec && 1630 now.tv_usec > sq->last_sent_time.tv_usec)) { 1631 /* convert from microseconds to milliseconds */ 1632 int roundtime = ((int)(now.tv_sec - sq->last_sent_time.tv_sec))*1000 1633 + ((int)now.tv_usec - (int)sq->last_sent_time.tv_usec)/1000; 1634 verbose(VERB_ALGO, "measured TCP-time at %d msec", roundtime); 1635 log_assert(roundtime >= 0); 1636 /* only store if less then AUTH_TIMEOUT seconds, it could be 1637 * huge due to system-hibernated and we woke up */ 1638 if(roundtime < TCP_AUTH_QUERY_TIMEOUT*1000) { 1639 if(!infra_rtt_update(sq->outnet->infra, &sq->addr, 1640 sq->addrlen, sq->zone, sq->zonelen, sq->qtype, 1641 roundtime, sq->last_rtt, (time_t)now.tv_sec)) 1642 log_err("out of memory noting rtt."); 1643 } 1644 } 1645 } 1646 /* insert address into reply info */ 1647 if(!rep) { 1648 /* create one if there isn't (on errors) */ 1649 rep = &r2; 1650 r2.c = c; 1651 } 1652 memcpy(&rep->addr, &sq->addr, sq->addrlen); 1653 rep->addrlen = sq->addrlen; 1654 serviced_callbacks(sq, error, c, rep); 1655 return 0; 1656} 1657 1658static void 1659serviced_tcp_initiate(struct serviced_query* sq, sldns_buffer* buff) 1660{ 1661 verbose(VERB_ALGO, "initiate TCP query %s", 1662 sq->status==serviced_query_TCP_EDNS?"EDNS":""); 1663 serviced_encode(sq, buff, sq->status == serviced_query_TCP_EDNS); 1664 sq->last_sent_time = *sq->outnet->now_tv; 1665 sq->pending = pending_tcp_query(sq, buff, TCP_AUTH_QUERY_TIMEOUT, 1666 serviced_tcp_callback, sq); 1667 if(!sq->pending) { 1668 /* delete from tree so that a retry by above layer does not 1669 * clash with this entry */ 1670 log_err("serviced_tcp_initiate: failed to send tcp query"); 1671 serviced_callbacks(sq, NETEVENT_CLOSED, NULL, NULL); 1672 } 1673} 1674 1675/** Send serviced query over TCP return false on initial failure */ 1676static int 1677serviced_tcp_send(struct serviced_query* sq, sldns_buffer* buff) 1678{ 1679 int vs, rtt; 1680 uint8_t edns_lame_known; 1681 if(!infra_host(sq->outnet->infra, &sq->addr, sq->addrlen, sq->zone, 1682 sq->zonelen, *sq->outnet->now_secs, &vs, &edns_lame_known, 1683 &rtt)) 1684 return 0; 1685 if(vs != -1) 1686 sq->status = serviced_query_TCP_EDNS; 1687 else sq->status = serviced_query_TCP; 1688 serviced_encode(sq, buff, sq->status == serviced_query_TCP_EDNS); 1689 sq->last_sent_time = *sq->outnet->now_tv; 1690 sq->pending = pending_tcp_query(sq, buff, TCP_AUTH_QUERY_TIMEOUT, 1691 serviced_tcp_callback, sq); 1692 return sq->pending != NULL; 1693} 1694 1695int 1696serviced_udp_callback(struct comm_point* c, void* arg, int error, 1697 struct comm_reply* rep) 1698{ 1699 struct serviced_query* sq = (struct serviced_query*)arg; 1700 struct outside_network* outnet = sq->outnet; 1701 struct timeval now = *sq->outnet->now_tv; 1702 int fallback_tcp = 0; 1703 1704 sq->pending = NULL; /* removed after callback */ 1705 if(error == NETEVENT_TIMEOUT) { 1706 int rto = 0; 1707 if(sq->status == serviced_query_PROBE_EDNS) { 1708 /* non-EDNS probe failed; we do not know its status, 1709 * keep trying with EDNS, timeout may not be caused 1710 * by EDNS. */ 1711 sq->status = serviced_query_UDP_EDNS; 1712 } 1713 if(sq->status == serviced_query_UDP_EDNS && sq->last_rtt < 5000) { 1714 /* fallback to 1480/1280 */ 1715 sq->status = serviced_query_UDP_EDNS_FRAG; 1716 log_name_addr(VERB_ALGO, "try edns1xx0", sq->qbuf+10, 1717 &sq->addr, sq->addrlen); 1718 if(!serviced_udp_send(sq, c->buffer)) { 1719 serviced_callbacks(sq, NETEVENT_CLOSED, c, rep); 1720 } 1721 return 0; 1722 } 1723 if(sq->status == serviced_query_UDP_EDNS_FRAG) { 1724 /* fragmentation size did not fix it */ 1725 sq->status = serviced_query_UDP_EDNS; 1726 } 1727 sq->retry++; 1728 if(!(rto=infra_rtt_update(outnet->infra, &sq->addr, sq->addrlen, 1729 sq->zone, sq->zonelen, sq->qtype, -1, sq->last_rtt, 1730 (time_t)now.tv_sec))) 1731 log_err("out of memory in UDP exponential backoff"); 1732 if(sq->retry < OUTBOUND_UDP_RETRY) { 1733 log_name_addr(VERB_ALGO, "retry query", sq->qbuf+10, 1734 &sq->addr, sq->addrlen); 1735 if(!serviced_udp_send(sq, c->buffer)) { 1736 serviced_callbacks(sq, NETEVENT_CLOSED, c, rep); 1737 } 1738 return 0; 1739 } 1740 if(rto >= RTT_MAX_TIMEOUT) { 1741 fallback_tcp = 1; 1742 /* UDP does not work, fallback to TCP below */ 1743 } else { 1744 serviced_callbacks(sq, NETEVENT_TIMEOUT, c, rep); 1745 return 0; 1746 } 1747 } else if(error != NETEVENT_NOERROR) { 1748 /* udp returns error (due to no ID or interface available) */ 1749 serviced_callbacks(sq, error, c, rep); 1750 return 0; 1751 } 1752#ifdef USE_DNSTAP 1753 if(outnet->dtenv && 1754 (outnet->dtenv->log_resolver_response_messages || 1755 outnet->dtenv->log_forwarder_response_messages)) 1756 dt_msg_send_outside_response(outnet->dtenv, &sq->addr, c->type, 1757 sq->zone, sq->zonelen, sq->qbuf, sq->qbuflen, 1758 &sq->last_sent_time, sq->outnet->now_tv, c->buffer); 1759#endif 1760 if(!fallback_tcp) { 1761 if( (sq->status == serviced_query_UDP_EDNS 1762 ||sq->status == serviced_query_UDP_EDNS_FRAG) 1763 && (LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) 1764 == LDNS_RCODE_FORMERR || LDNS_RCODE_WIRE( 1765 sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NOTIMPL)) { 1766 /* try to get an answer by falling back without EDNS */ 1767 verbose(VERB_ALGO, "serviced query: attempt without EDNS"); 1768 sq->status = serviced_query_UDP_EDNS_fallback; 1769 sq->retry = 0; 1770 if(!serviced_udp_send(sq, c->buffer)) { 1771 serviced_callbacks(sq, NETEVENT_CLOSED, c, rep); 1772 } 1773 return 0; 1774 } else if(sq->status == serviced_query_PROBE_EDNS) { 1775 /* probe without EDNS succeeds, so we conclude that this 1776 * host likely has EDNS packets dropped */ 1777 log_addr(VERB_DETAIL, "timeouts, concluded that connection to " 1778 "host drops EDNS packets", &sq->addr, sq->addrlen); 1779 /* only store noEDNS in cache if domain is noDNSSEC */ 1780 if(!sq->want_dnssec) 1781 if(!infra_edns_update(outnet->infra, &sq->addr, sq->addrlen, 1782 sq->zone, sq->zonelen, -1, (time_t)now.tv_sec)) { 1783 log_err("Out of memory caching no edns for host"); 1784 } 1785 sq->status = serviced_query_UDP; 1786 } else if(sq->status == serviced_query_UDP_EDNS && 1787 !sq->edns_lame_known) { 1788 /* now we know that edns queries received answers store that */ 1789 log_addr(VERB_ALGO, "serviced query: EDNS works for", 1790 &sq->addr, sq->addrlen); 1791 if(!infra_edns_update(outnet->infra, &sq->addr, sq->addrlen, 1792 sq->zone, sq->zonelen, 0, (time_t)now.tv_sec)) { 1793 log_err("Out of memory caching edns works"); 1794 } 1795 sq->edns_lame_known = 1; 1796 } else if(sq->status == serviced_query_UDP_EDNS_fallback && 1797 !sq->edns_lame_known && (LDNS_RCODE_WIRE( 1798 sldns_buffer_begin(c->buffer)) == LDNS_RCODE_NOERROR || 1799 LDNS_RCODE_WIRE(sldns_buffer_begin(c->buffer)) == 1800 LDNS_RCODE_NXDOMAIN || LDNS_RCODE_WIRE(sldns_buffer_begin( 1801 c->buffer)) == LDNS_RCODE_YXDOMAIN)) { 1802 /* the fallback produced a result that looks promising, note 1803 * that this server should be approached without EDNS */ 1804 /* only store noEDNS in cache if domain is noDNSSEC */ 1805 if(!sq->want_dnssec) { 1806 log_addr(VERB_ALGO, "serviced query: EDNS fails for", 1807 &sq->addr, sq->addrlen); 1808 if(!infra_edns_update(outnet->infra, &sq->addr, sq->addrlen, 1809 sq->zone, sq->zonelen, -1, (time_t)now.tv_sec)) { 1810 log_err("Out of memory caching no edns for host"); 1811 } 1812 } else { 1813 log_addr(VERB_ALGO, "serviced query: EDNS fails, but " 1814 "not stored because need DNSSEC for", &sq->addr, 1815 sq->addrlen); 1816 } 1817 sq->status = serviced_query_UDP; 1818 } 1819 if(now.tv_sec > sq->last_sent_time.tv_sec || 1820 (now.tv_sec == sq->last_sent_time.tv_sec && 1821 now.tv_usec > sq->last_sent_time.tv_usec)) { 1822 /* convert from microseconds to milliseconds */ 1823 int roundtime = ((int)(now.tv_sec - sq->last_sent_time.tv_sec))*1000 1824 + ((int)now.tv_usec - (int)sq->last_sent_time.tv_usec)/1000; 1825 verbose(VERB_ALGO, "measured roundtrip at %d msec", roundtime); 1826 log_assert(roundtime >= 0); 1827 /* in case the system hibernated, do not enter a huge value, 1828 * above this value gives trouble with server selection */ 1829 if(roundtime < 60000) { 1830 if(!infra_rtt_update(outnet->infra, &sq->addr, sq->addrlen, 1831 sq->zone, sq->zonelen, sq->qtype, roundtime, 1832 sq->last_rtt, (time_t)now.tv_sec)) 1833 log_err("out of memory noting rtt."); 1834 } 1835 } 1836 } /* end of if_!fallback_tcp */ 1837 /* perform TC flag check and TCP fallback after updating our 1838 * cache entries for EDNS status and RTT times */ 1839 if(LDNS_TC_WIRE(sldns_buffer_begin(c->buffer)) || fallback_tcp) { 1840 /* fallback to TCP */ 1841 /* this discards partial UDP contents */ 1842 if(sq->status == serviced_query_UDP_EDNS || 1843 sq->status == serviced_query_UDP_EDNS_FRAG || 1844 sq->status == serviced_query_UDP_EDNS_fallback) 1845 /* if we have unfinished EDNS_fallback, start again */ 1846 sq->status = serviced_query_TCP_EDNS; 1847 else sq->status = serviced_query_TCP; 1848 serviced_tcp_initiate(sq, c->buffer); 1849 return 0; 1850 } 1851 /* yay! an answer */ 1852 serviced_callbacks(sq, error, c, rep); 1853 return 0; 1854} 1855 1856struct serviced_query* 1857outnet_serviced_query(struct outside_network* outnet, 1858 uint8_t* qname, size_t qnamelen, uint16_t qtype, uint16_t qclass, 1859 uint16_t flags, int dnssec, int want_dnssec, int nocaps, 1860 int tcp_upstream, int ssl_upstream, struct sockaddr_storage* addr, 1861 socklen_t addrlen, uint8_t* zone, size_t zonelen, 1862 comm_point_callback_t* callback, void* callback_arg, 1863 sldns_buffer* buff) 1864{ 1865 struct serviced_query* sq; 1866 struct service_callback* cb; 1867 serviced_gen_query(buff, qname, qnamelen, qtype, qclass, flags); 1868 sq = lookup_serviced(outnet, buff, dnssec, addr, addrlen); 1869 /* duplicate entries are included in the callback list, because 1870 * there is a counterpart registration by our caller that needs to 1871 * be doubly-removed (with callbacks perhaps). */ 1872 if(!(cb = (struct service_callback*)malloc(sizeof(*cb)))) 1873 return NULL; 1874 if(!sq) { 1875 /* make new serviced query entry */ 1876 sq = serviced_create(outnet, buff, dnssec, want_dnssec, nocaps, 1877 tcp_upstream, ssl_upstream, addr, addrlen, zone, 1878 zonelen, (int)qtype); 1879 if(!sq) { 1880 free(cb); 1881 return NULL; 1882 } 1883 /* perform first network action */ 1884 if(outnet->do_udp && !(tcp_upstream || ssl_upstream)) { 1885 if(!serviced_udp_send(sq, buff)) { 1886 (void)rbtree_delete(outnet->serviced, sq); 1887 free(sq->qbuf); 1888 free(sq->zone); 1889 free(sq); 1890 free(cb); 1891 return NULL; 1892 } 1893 } else { 1894 if(!serviced_tcp_send(sq, buff)) { 1895 (void)rbtree_delete(outnet->serviced, sq); 1896 free(sq->qbuf); 1897 free(sq->zone); 1898 free(sq); 1899 free(cb); 1900 return NULL; 1901 } 1902 } 1903 } 1904 /* add callback to list of callbacks */ 1905 cb->cb = callback; 1906 cb->cb_arg = callback_arg; 1907 cb->next = sq->cblist; 1908 sq->cblist = cb; 1909 return sq; 1910} 1911 1912/** remove callback from list */ 1913static void 1914callback_list_remove(struct serviced_query* sq, void* cb_arg) 1915{ 1916 struct service_callback** pp = &sq->cblist; 1917 while(*pp) { 1918 if((*pp)->cb_arg == cb_arg) { 1919 struct service_callback* del = *pp; 1920 *pp = del->next; 1921 free(del); 1922 return; 1923 } 1924 pp = &(*pp)->next; 1925 } 1926} 1927 1928void outnet_serviced_query_stop(struct serviced_query* sq, void* cb_arg) 1929{ 1930 if(!sq) 1931 return; 1932 callback_list_remove(sq, cb_arg); 1933 /* if callbacks() routine scheduled deletion, let it do that */ 1934 if(!sq->cblist && !sq->to_be_deleted) { 1935#ifdef UNBOUND_DEBUG 1936 rbnode_t* rem = 1937#else 1938 (void) 1939#endif 1940 rbtree_delete(sq->outnet->serviced, sq); 1941 log_assert(rem); /* should be present */ 1942 serviced_delete(sq); 1943 } 1944} 1945 1946/** get memory used by waiting tcp entry (in use or not) */ 1947static size_t 1948waiting_tcp_get_mem(struct waiting_tcp* w) 1949{ 1950 size_t s; 1951 if(!w) return 0; 1952 s = sizeof(*w) + w->pkt_len; 1953 if(w->timer) 1954 s += comm_timer_get_mem(w->timer); 1955 return s; 1956} 1957 1958/** get memory used by port if */ 1959static size_t 1960if_get_mem(struct port_if* pif) 1961{ 1962 size_t s; 1963 int i; 1964 s = sizeof(*pif) + sizeof(int)*pif->avail_total + 1965 sizeof(struct port_comm*)*pif->maxout; 1966 for(i=0; i<pif->inuse; i++) 1967 s += sizeof(*pif->out[i]) + 1968 comm_point_get_mem(pif->out[i]->cp); 1969 return s; 1970} 1971 1972/** get memory used by waiting udp */ 1973static size_t 1974waiting_udp_get_mem(struct pending* w) 1975{ 1976 size_t s; 1977 s = sizeof(*w) + comm_timer_get_mem(w->timer) + w->pkt_len; 1978 return s; 1979} 1980 1981size_t outnet_get_mem(struct outside_network* outnet) 1982{ 1983 size_t i; 1984 int k; 1985 struct waiting_tcp* w; 1986 struct pending* u; 1987 struct serviced_query* sq; 1988 struct service_callback* sb; 1989 struct port_comm* pc; 1990 size_t s = sizeof(*outnet) + sizeof(*outnet->base) + 1991 sizeof(*outnet->udp_buff) + 1992 sldns_buffer_capacity(outnet->udp_buff); 1993 /* second buffer is not ours */ 1994 for(pc = outnet->unused_fds; pc; pc = pc->next) { 1995 s += sizeof(*pc) + comm_point_get_mem(pc->cp); 1996 } 1997 for(k=0; k<outnet->num_ip4; k++) 1998 s += if_get_mem(&outnet->ip4_ifs[k]); 1999 for(k=0; k<outnet->num_ip6; k++) 2000 s += if_get_mem(&outnet->ip6_ifs[k]); 2001 for(u=outnet->udp_wait_first; u; u=u->next_waiting) 2002 s += waiting_udp_get_mem(u); 2003 2004 s += sizeof(struct pending_tcp*)*outnet->num_tcp; 2005 for(i=0; i<outnet->num_tcp; i++) { 2006 s += sizeof(struct pending_tcp); 2007 s += comm_point_get_mem(outnet->tcp_conns[i]->c); 2008 if(outnet->tcp_conns[i]->query) 2009 s += waiting_tcp_get_mem(outnet->tcp_conns[i]->query); 2010 } 2011 for(w=outnet->tcp_wait_first; w; w = w->next_waiting) 2012 s += waiting_tcp_get_mem(w); 2013 s += sizeof(*outnet->pending); 2014 s += (sizeof(struct pending) + comm_timer_get_mem(NULL)) * 2015 outnet->pending->count; 2016 s += sizeof(*outnet->serviced); 2017 s += outnet->svcd_overhead; 2018 RBTREE_FOR(sq, struct serviced_query*, outnet->serviced) { 2019 s += sizeof(*sq) + sq->qbuflen; 2020 for(sb = sq->cblist; sb; sb = sb->next) 2021 s += sizeof(*sb); 2022 } 2023 return s; 2024} 2025 2026size_t 2027serviced_get_mem(struct serviced_query* sq) 2028{ 2029 struct service_callback* sb; 2030 size_t s; 2031 s = sizeof(*sq) + sq->qbuflen; 2032 for(sb = sq->cblist; sb; sb = sb->next) 2033 s += sizeof(*sb); 2034 if(sq->status == serviced_query_UDP_EDNS || 2035 sq->status == serviced_query_UDP || 2036 sq->status == serviced_query_PROBE_EDNS || 2037 sq->status == serviced_query_UDP_EDNS_FRAG || 2038 sq->status == serviced_query_UDP_EDNS_fallback) { 2039 s += sizeof(struct pending); 2040 s += comm_timer_get_mem(NULL); 2041 } else { 2042 /* does not have size of the pkt pointer */ 2043 /* always has a timer except on malloc failures */ 2044 2045 /* these sizes are part of the main outside network mem */ 2046 /* 2047 s += sizeof(struct waiting_tcp); 2048 s += comm_timer_get_mem(NULL); 2049 */ 2050 } 2051 return s; 2052} 2053 2054