1/* 2 * util/netevent.c - event notification 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 LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE 27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36/** 37 * \file 38 * 39 * This file contains event notification functions. 40 */ 41#include "config.h" 42#include <ldns/wire2host.h> 43#include "util/netevent.h" 44#include "util/log.h" 45#include "util/net_help.h" 46#include "util/fptr_wlist.h" 47#ifdef HAVE_OPENSSL_SSL_H 48#include <openssl/ssl.h> 49#endif 50#ifdef HAVE_OPENSSL_ERR_H 51#include <openssl/err.h> 52#endif 53 54/* -------- Start of local definitions -------- */ 55/** if CMSG_ALIGN is not defined on this platform, a workaround */ 56#ifndef CMSG_ALIGN 57# ifdef _CMSG_DATA_ALIGN 58# define CMSG_ALIGN _CMSG_DATA_ALIGN 59# else 60# define CMSG_ALIGN(len) (((len)+sizeof(long)-1) & ~(sizeof(long)-1)) 61# endif 62#endif 63 64/** if CMSG_LEN is not defined on this platform, a workaround */ 65#ifndef CMSG_LEN 66# define CMSG_LEN(len) (CMSG_ALIGN(sizeof(struct cmsghdr))+(len)) 67#endif 68 69/** if CMSG_SPACE is not defined on this platform, a workaround */ 70#ifndef CMSG_SPACE 71# ifdef _CMSG_HDR_ALIGN 72# define CMSG_SPACE(l) (CMSG_ALIGN(l)+_CMSG_HDR_ALIGN(sizeof(struct cmsghdr))) 73# else 74# define CMSG_SPACE(l) (CMSG_ALIGN(l)+CMSG_ALIGN(sizeof(struct cmsghdr))) 75# endif 76#endif 77 78/** The TCP reading or writing query timeout in seconds */ 79#define TCP_QUERY_TIMEOUT 120 80 81#ifndef NONBLOCKING_IS_BROKEN 82/** number of UDP reads to perform per read indication from select */ 83#define NUM_UDP_PER_SELECT 100 84#else 85#define NUM_UDP_PER_SELECT 1 86#endif 87 88/* We define libevent structures here to hide the libevent stuff. */ 89 90#ifdef USE_MINI_EVENT 91# ifdef USE_WINSOCK 92# include "util/winsock_event.h" 93# else 94# include "util/mini_event.h" 95# endif /* USE_WINSOCK */ 96#else /* USE_MINI_EVENT */ 97 /* we use libevent */ 98# ifdef HAVE_EVENT_H 99# include <event.h> 100# else 101# include "event2/event.h" 102# include "event2/event_struct.h" 103# include "event2/event_compat.h" 104# endif 105#endif /* USE_MINI_EVENT */ 106 107/** 108 * The internal event structure for keeping libevent info for the event. 109 * Possibly other structures (list, tree) this is part of. 110 */ 111struct internal_event { 112 /** the comm base */ 113 struct comm_base* base; 114 /** libevent event type, alloced here */ 115 struct event ev; 116}; 117 118/** 119 * Internal base structure, so that every thread has its own events. 120 */ 121struct internal_base { 122 /** libevent event_base type. */ 123 struct event_base* base; 124 /** seconds time pointer points here */ 125 uint32_t secs; 126 /** timeval with current time */ 127 struct timeval now; 128 /** the event used for slow_accept timeouts */ 129 struct event slow_accept; 130 /** true if slow_accept is enabled */ 131 int slow_accept_enabled; 132}; 133 134/** 135 * Internal timer structure, to store timer event in. 136 */ 137struct internal_timer { 138 /** the comm base */ 139 struct comm_base* base; 140 /** libevent event type, alloced here */ 141 struct event ev; 142 /** is timer enabled */ 143 uint8_t enabled; 144}; 145 146/** 147 * Internal signal structure, to store signal event in. 148 */ 149struct internal_signal { 150 /** libevent event type, alloced here */ 151 struct event ev; 152 /** next in signal list */ 153 struct internal_signal* next; 154}; 155 156/** create a tcp handler with a parent */ 157static struct comm_point* comm_point_create_tcp_handler( 158 struct comm_base *base, struct comm_point* parent, size_t bufsize, 159 comm_point_callback_t* callback, void* callback_arg); 160 161/* -------- End of local definitions -------- */ 162 163#ifdef USE_MINI_EVENT 164/** minievent updates the time when it blocks. */ 165#define comm_base_now(x) /* nothing to do */ 166#else /* !USE_MINI_EVENT */ 167/** fillup the time values in the event base */ 168static void 169comm_base_now(struct comm_base* b) 170{ 171 if(gettimeofday(&b->eb->now, NULL) < 0) { 172 log_err("gettimeofday: %s", strerror(errno)); 173 } 174 b->eb->secs = (uint32_t)b->eb->now.tv_sec; 175} 176#endif /* USE_MINI_EVENT */ 177 178struct comm_base* 179comm_base_create(int sigs) 180{ 181 struct comm_base* b = (struct comm_base*)calloc(1, 182 sizeof(struct comm_base)); 183 if(!b) 184 return NULL; 185 b->eb = (struct internal_base*)calloc(1, sizeof(struct internal_base)); 186 if(!b->eb) { 187 free(b); 188 return NULL; 189 } 190#ifdef USE_MINI_EVENT 191 (void)sigs; 192 /* use mini event time-sharing feature */ 193 b->eb->base = event_init(&b->eb->secs, &b->eb->now); 194#else 195# if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 196 /* libev */ 197 if(sigs) 198 b->eb->base=(struct event_base *)ev_default_loop(EVFLAG_AUTO); 199 else 200 b->eb->base=(struct event_base *)ev_loop_new(EVFLAG_AUTO); 201# else 202 (void)sigs; 203# ifdef HAVE_EVENT_BASE_NEW 204 b->eb->base = event_base_new(); 205# else 206 b->eb->base = event_init(); 207# endif 208# endif 209#endif 210 if(!b->eb->base) { 211 free(b->eb); 212 free(b); 213 return NULL; 214 } 215 comm_base_now(b); 216 /* avoid event_get_method call which causes crashes even when 217 * not printing, because its result is passed */ 218 verbose(VERB_ALGO, 219#if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP) 220 "libev" 221#elif defined(USE_MINI_EVENT) 222 "event " 223#else 224 "libevent " 225#endif 226 "%s uses %s method.", 227 event_get_version(), 228#ifdef HAVE_EVENT_BASE_GET_METHOD 229 event_base_get_method(b->eb->base) 230#else 231 "not_obtainable" 232#endif 233 ); 234 return b; 235} 236 237void 238comm_base_delete(struct comm_base* b) 239{ 240 if(!b) 241 return; 242 if(b->eb->slow_accept_enabled) { 243 if(event_del(&b->eb->slow_accept) != 0) { 244 log_err("could not event_del slow_accept"); 245 } 246 } 247#ifdef USE_MINI_EVENT 248 event_base_free(b->eb->base); 249#elif defined(HAVE_EVENT_BASE_FREE) && defined(HAVE_EVENT_BASE_ONCE) 250 /* only libevent 1.2+ has it, but in 1.2 it is broken - 251 assertion fails on signal handling ev that is not deleted 252 in libevent 1.3c (event_base_once appears) this is fixed. */ 253 event_base_free(b->eb->base); 254#endif /* HAVE_EVENT_BASE_FREE and HAVE_EVENT_BASE_ONCE */ 255 b->eb->base = NULL; 256 free(b->eb); 257 free(b); 258} 259 260void 261comm_base_timept(struct comm_base* b, uint32_t** tt, struct timeval** tv) 262{ 263 *tt = &b->eb->secs; 264 *tv = &b->eb->now; 265} 266 267void 268comm_base_dispatch(struct comm_base* b) 269{ 270 int retval; 271 retval = event_base_dispatch(b->eb->base); 272 if(retval != 0) { 273 fatal_exit("event_dispatch returned error %d, " 274 "errno is %s", retval, strerror(errno)); 275 } 276} 277 278void comm_base_exit(struct comm_base* b) 279{ 280 if(event_base_loopexit(b->eb->base, NULL) != 0) { 281 log_err("Could not loopexit"); 282 } 283} 284 285void comm_base_set_slow_accept_handlers(struct comm_base* b, 286 void (*stop_acc)(void*), void (*start_acc)(void*), void* arg) 287{ 288 b->stop_accept = stop_acc; 289 b->start_accept = start_acc; 290 b->cb_arg = arg; 291} 292 293struct event_base* comm_base_internal(struct comm_base* b) 294{ 295 return b->eb->base; 296} 297 298/** see if errno for udp has to be logged or not uses globals */ 299static int 300udp_send_errno_needs_log(struct sockaddr* addr, socklen_t addrlen) 301{ 302 /* do not log transient errors (unless high verbosity) */ 303#if defined(ENETUNREACH) || defined(EHOSTDOWN) || defined(EHOSTUNREACH) || defined(ENETDOWN) 304 switch(errno) { 305# ifdef ENETUNREACH 306 case ENETUNREACH: 307# endif 308# ifdef EHOSTDOWN 309 case EHOSTDOWN: 310# endif 311# ifdef EHOSTUNREACH 312 case EHOSTUNREACH: 313# endif 314# ifdef ENETDOWN 315 case ENETDOWN: 316# endif 317 if(verbosity < VERB_ALGO) 318 return 0; 319 default: 320 break; 321 } 322#endif 323 /* squelch errors where people deploy AAAA ::ffff:bla for 324 * authority servers, which we try for intranets. */ 325 if(errno == EINVAL && addr_is_ip4mapped( 326 (struct sockaddr_storage*)addr, addrlen) && 327 verbosity < VERB_DETAIL) 328 return 0; 329 /* SO_BROADCAST sockopt can give access to 255.255.255.255, 330 * but a dns cache does not need it. */ 331 if(errno == EACCES && addr_is_broadcast( 332 (struct sockaddr_storage*)addr, addrlen) && 333 verbosity < VERB_DETAIL) 334 return 0; 335 return 1; 336} 337 338int tcp_connect_errno_needs_log(struct sockaddr* addr, socklen_t addrlen) 339{ 340 return udp_send_errno_needs_log(addr, addrlen); 341} 342 343/* send a UDP reply */ 344int 345comm_point_send_udp_msg(struct comm_point *c, ldns_buffer* packet, 346 struct sockaddr* addr, socklen_t addrlen) 347{ 348 ssize_t sent; 349 log_assert(c->fd != -1); 350#ifdef UNBOUND_DEBUG 351 if(ldns_buffer_remaining(packet) == 0) 352 log_err("error: send empty UDP packet"); 353#endif 354 log_assert(addr && addrlen > 0); 355 sent = sendto(c->fd, (void*)ldns_buffer_begin(packet), 356 ldns_buffer_remaining(packet), 0, 357 addr, addrlen); 358 if(sent == -1) { 359 if(!udp_send_errno_needs_log(addr, addrlen)) 360 return 0; 361#ifndef USE_WINSOCK 362 verbose(VERB_OPS, "sendto failed: %s", strerror(errno)); 363#else 364 verbose(VERB_OPS, "sendto failed: %s", 365 wsa_strerror(WSAGetLastError())); 366#endif 367 log_addr(VERB_OPS, "remote address is", 368 (struct sockaddr_storage*)addr, addrlen); 369 return 0; 370 } else if((size_t)sent != ldns_buffer_remaining(packet)) { 371 log_err("sent %d in place of %d bytes", 372 (int)sent, (int)ldns_buffer_remaining(packet)); 373 return 0; 374 } 375 return 1; 376} 377 378#if defined(AF_INET6) && defined(IPV6_PKTINFO) && (defined(HAVE_RECVMSG) || defined(HAVE_SENDMSG)) 379/** print debug ancillary info */ 380static void p_ancil(const char* str, struct comm_reply* r) 381{ 382 if(r->srctype != 4 && r->srctype != 6) { 383 log_info("%s: unknown srctype %d", str, r->srctype); 384 return; 385 } 386 if(r->srctype == 6) { 387 char buf[1024]; 388 if(inet_ntop(AF_INET6, &r->pktinfo.v6info.ipi6_addr, 389 buf, (socklen_t)sizeof(buf)) == 0) { 390 strncpy(buf, "(inet_ntop error)", sizeof(buf)); 391 } 392 buf[sizeof(buf)-1]=0; 393 log_info("%s: %s %d", str, buf, r->pktinfo.v6info.ipi6_ifindex); 394 } else if(r->srctype == 4) { 395#ifdef IP_PKTINFO 396 char buf1[1024], buf2[1024]; 397 if(inet_ntop(AF_INET, &r->pktinfo.v4info.ipi_addr, 398 buf1, (socklen_t)sizeof(buf1)) == 0) { 399 strncpy(buf1, "(inet_ntop error)", sizeof(buf1)); 400 } 401 buf1[sizeof(buf1)-1]=0; 402#ifdef HAVE_STRUCT_IN_PKTINFO_IPI_SPEC_DST 403 if(inet_ntop(AF_INET, &r->pktinfo.v4info.ipi_spec_dst, 404 buf2, (socklen_t)sizeof(buf2)) == 0) { 405 strncpy(buf2, "(inet_ntop error)", sizeof(buf2)); 406 } 407 buf2[sizeof(buf2)-1]=0; 408#else 409 buf2[0]=0; 410#endif 411 log_info("%s: %d %s %s", str, r->pktinfo.v4info.ipi_ifindex, 412 buf1, buf2); 413#elif defined(IP_RECVDSTADDR) 414 char buf1[1024]; 415 if(inet_ntop(AF_INET, &r->pktinfo.v4addr, 416 buf1, (socklen_t)sizeof(buf1)) == 0) { 417 strncpy(buf1, "(inet_ntop error)", sizeof(buf1)); 418 } 419 buf1[sizeof(buf1)-1]=0; 420 log_info("%s: %s", str, buf1); 421#endif /* IP_PKTINFO or PI_RECVDSTDADDR */ 422 } 423} 424#endif /* AF_INET6 && IPV6_PKTINFO && HAVE_RECVMSG||HAVE_SENDMSG */ 425 426/** send a UDP reply over specified interface*/ 427static int 428comm_point_send_udp_msg_if(struct comm_point *c, ldns_buffer* packet, 429 struct sockaddr* addr, socklen_t addrlen, struct comm_reply* r) 430{ 431#if defined(AF_INET6) && defined(IPV6_PKTINFO) && defined(HAVE_SENDMSG) 432 ssize_t sent; 433 struct msghdr msg; 434 struct iovec iov[1]; 435 char control[256]; 436#ifndef S_SPLINT_S 437 struct cmsghdr *cmsg; 438#endif /* S_SPLINT_S */ 439 440 log_assert(c->fd != -1); 441#ifdef UNBOUND_DEBUG 442 if(ldns_buffer_remaining(packet) == 0) 443 log_err("error: send empty UDP packet"); 444#endif 445 log_assert(addr && addrlen > 0); 446 447 msg.msg_name = addr; 448 msg.msg_namelen = addrlen; 449 iov[0].iov_base = ldns_buffer_begin(packet); 450 iov[0].iov_len = ldns_buffer_remaining(packet); 451 msg.msg_iov = iov; 452 msg.msg_iovlen = 1; 453 msg.msg_control = control; 454#ifndef S_SPLINT_S 455 msg.msg_controllen = sizeof(control); 456#endif /* S_SPLINT_S */ 457 msg.msg_flags = 0; 458 459#ifndef S_SPLINT_S 460 cmsg = CMSG_FIRSTHDR(&msg); 461 if(r->srctype == 4) { 462#ifdef IP_PKTINFO 463 msg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo)); 464 log_assert(msg.msg_controllen <= sizeof(control)); 465 cmsg->cmsg_level = IPPROTO_IP; 466 cmsg->cmsg_type = IP_PKTINFO; 467 memmove(CMSG_DATA(cmsg), &r->pktinfo.v4info, 468 sizeof(struct in_pktinfo)); 469 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); 470#elif defined(IP_SENDSRCADDR) 471 msg.msg_controllen = CMSG_SPACE(sizeof(struct in_addr)); 472 log_assert(msg.msg_controllen <= sizeof(control)); 473 cmsg->cmsg_level = IPPROTO_IP; 474 cmsg->cmsg_type = IP_SENDSRCADDR; 475 memmove(CMSG_DATA(cmsg), &r->pktinfo.v4addr, 476 sizeof(struct in_addr)); 477 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr)); 478#else 479 verbose(VERB_ALGO, "no IP_PKTINFO or IP_SENDSRCADDR"); 480 msg.msg_control = NULL; 481#endif /* IP_PKTINFO or IP_SENDSRCADDR */ 482 } else if(r->srctype == 6) { 483 msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 484 log_assert(msg.msg_controllen <= sizeof(control)); 485 cmsg->cmsg_level = IPPROTO_IPV6; 486 cmsg->cmsg_type = IPV6_PKTINFO; 487 memmove(CMSG_DATA(cmsg), &r->pktinfo.v6info, 488 sizeof(struct in6_pktinfo)); 489 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 490 } else { 491 /* try to pass all 0 to use default route */ 492 msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 493 log_assert(msg.msg_controllen <= sizeof(control)); 494 cmsg->cmsg_level = IPPROTO_IPV6; 495 cmsg->cmsg_type = IPV6_PKTINFO; 496 memset(CMSG_DATA(cmsg), 0, sizeof(struct in6_pktinfo)); 497 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 498 } 499#endif /* S_SPLINT_S */ 500 if(verbosity >= VERB_ALGO) 501 p_ancil("send_udp over interface", r); 502 sent = sendmsg(c->fd, &msg, 0); 503 if(sent == -1) { 504 if(!udp_send_errno_needs_log(addr, addrlen)) 505 return 0; 506 verbose(VERB_OPS, "sendmsg failed: %s", strerror(errno)); 507 log_addr(VERB_OPS, "remote address is", 508 (struct sockaddr_storage*)addr, addrlen); 509 return 0; 510 } else if((size_t)sent != ldns_buffer_remaining(packet)) { 511 log_err("sent %d in place of %d bytes", 512 (int)sent, (int)ldns_buffer_remaining(packet)); 513 return 0; 514 } 515 return 1; 516#else 517 (void)c; 518 (void)packet; 519 (void)addr; 520 (void)addrlen; 521 (void)r; 522 log_err("sendmsg: IPV6_PKTINFO not supported"); 523 return 0; 524#endif /* AF_INET6 && IPV6_PKTINFO && HAVE_SENDMSG */ 525} 526 527void 528comm_point_udp_ancil_callback(int fd, short event, void* arg) 529{ 530#if defined(AF_INET6) && defined(IPV6_PKTINFO) && defined(HAVE_RECVMSG) 531 struct comm_reply rep; 532 struct msghdr msg; 533 struct iovec iov[1]; 534 ssize_t rcv; 535 char ancil[256]; 536 int i; 537#ifndef S_SPLINT_S 538 struct cmsghdr* cmsg; 539#endif /* S_SPLINT_S */ 540 541 rep.c = (struct comm_point*)arg; 542 log_assert(rep.c->type == comm_udp); 543 544 if(!(event&EV_READ)) 545 return; 546 log_assert(rep.c && rep.c->buffer && rep.c->fd == fd); 547 comm_base_now(rep.c->ev->base); 548 for(i=0; i<NUM_UDP_PER_SELECT; i++) { 549 ldns_buffer_clear(rep.c->buffer); 550 rep.addrlen = (socklen_t)sizeof(rep.addr); 551 log_assert(fd != -1); 552 log_assert(ldns_buffer_remaining(rep.c->buffer) > 0); 553 msg.msg_name = &rep.addr; 554 msg.msg_namelen = (socklen_t)sizeof(rep.addr); 555 iov[0].iov_base = ldns_buffer_begin(rep.c->buffer); 556 iov[0].iov_len = ldns_buffer_remaining(rep.c->buffer); 557 msg.msg_iov = iov; 558 msg.msg_iovlen = 1; 559 msg.msg_control = ancil; 560#ifndef S_SPLINT_S 561 msg.msg_controllen = sizeof(ancil); 562#endif /* S_SPLINT_S */ 563 msg.msg_flags = 0; 564 rcv = recvmsg(fd, &msg, 0); 565 if(rcv == -1) { 566 if(errno != EAGAIN && errno != EINTR) { 567 log_err("recvmsg failed: %s", strerror(errno)); 568 } 569 return; 570 } 571 rep.addrlen = msg.msg_namelen; 572 ldns_buffer_skip(rep.c->buffer, rcv); 573 ldns_buffer_flip(rep.c->buffer); 574 rep.srctype = 0; 575#ifndef S_SPLINT_S 576 for(cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; 577 cmsg = CMSG_NXTHDR(&msg, cmsg)) { 578 if( cmsg->cmsg_level == IPPROTO_IPV6 && 579 cmsg->cmsg_type == IPV6_PKTINFO) { 580 rep.srctype = 6; 581 memmove(&rep.pktinfo.v6info, CMSG_DATA(cmsg), 582 sizeof(struct in6_pktinfo)); 583 break; 584#ifdef IP_PKTINFO 585 } else if( cmsg->cmsg_level == IPPROTO_IP && 586 cmsg->cmsg_type == IP_PKTINFO) { 587 rep.srctype = 4; 588 memmove(&rep.pktinfo.v4info, CMSG_DATA(cmsg), 589 sizeof(struct in_pktinfo)); 590 break; 591#elif defined(IP_RECVDSTADDR) 592 } else if( cmsg->cmsg_level == IPPROTO_IP && 593 cmsg->cmsg_type == IP_RECVDSTADDR) { 594 rep.srctype = 4; 595 memmove(&rep.pktinfo.v4addr, CMSG_DATA(cmsg), 596 sizeof(struct in_addr)); 597 break; 598#endif /* IP_PKTINFO or IP_RECVDSTADDR */ 599 } 600 } 601 if(verbosity >= VERB_ALGO) 602 p_ancil("receive_udp on interface", &rep); 603#endif /* S_SPLINT_S */ 604 fptr_ok(fptr_whitelist_comm_point(rep.c->callback)); 605 if((*rep.c->callback)(rep.c, rep.c->cb_arg, NETEVENT_NOERROR, &rep)) { 606 /* send back immediate reply */ 607 (void)comm_point_send_udp_msg_if(rep.c, rep.c->buffer, 608 (struct sockaddr*)&rep.addr, rep.addrlen, &rep); 609 } 610 if(rep.c->fd == -1) /* commpoint closed */ 611 break; 612 } 613#else 614 (void)fd; 615 (void)event; 616 (void)arg; 617 fatal_exit("recvmsg: No support for IPV6_PKTINFO. " 618 "Please disable interface-automatic"); 619#endif /* AF_INET6 && IPV6_PKTINFO && HAVE_RECVMSG */ 620} 621 622void 623comm_point_udp_callback(int fd, short event, void* arg) 624{ 625 struct comm_reply rep; 626 ssize_t rcv; 627 int i; 628 629 rep.c = (struct comm_point*)arg; 630 log_assert(rep.c->type == comm_udp); 631 632 if(!(event&EV_READ)) 633 return; 634 log_assert(rep.c && rep.c->buffer && rep.c->fd == fd); 635 comm_base_now(rep.c->ev->base); 636 for(i=0; i<NUM_UDP_PER_SELECT; i++) { 637 ldns_buffer_clear(rep.c->buffer); 638 rep.addrlen = (socklen_t)sizeof(rep.addr); 639 log_assert(fd != -1); 640 log_assert(ldns_buffer_remaining(rep.c->buffer) > 0); 641 rcv = recvfrom(fd, (void*)ldns_buffer_begin(rep.c->buffer), 642 ldns_buffer_remaining(rep.c->buffer), 0, 643 (struct sockaddr*)&rep.addr, &rep.addrlen); 644 if(rcv == -1) { 645#ifndef USE_WINSOCK 646 if(errno != EAGAIN && errno != EINTR) 647 log_err("recvfrom %d failed: %s", 648 fd, strerror(errno)); 649#else 650 if(WSAGetLastError() != WSAEINPROGRESS && 651 WSAGetLastError() != WSAECONNRESET && 652 WSAGetLastError()!= WSAEWOULDBLOCK) 653 log_err("recvfrom failed: %s", 654 wsa_strerror(WSAGetLastError())); 655#endif 656 return; 657 } 658 ldns_buffer_skip(rep.c->buffer, rcv); 659 ldns_buffer_flip(rep.c->buffer); 660 rep.srctype = 0; 661 fptr_ok(fptr_whitelist_comm_point(rep.c->callback)); 662 if((*rep.c->callback)(rep.c, rep.c->cb_arg, NETEVENT_NOERROR, &rep)) { 663 /* send back immediate reply */ 664 (void)comm_point_send_udp_msg(rep.c, rep.c->buffer, 665 (struct sockaddr*)&rep.addr, rep.addrlen); 666 } 667 if(rep.c->fd != fd) /* commpoint closed to -1 or reused for 668 another UDP port. Note rep.c cannot be reused with TCP fd. */ 669 break; 670 } 671} 672 673/** Use a new tcp handler for new query fd, set to read query */ 674static void 675setup_tcp_handler(struct comm_point* c, int fd) 676{ 677 log_assert(c->type == comm_tcp); 678 log_assert(c->fd == -1); 679 ldns_buffer_clear(c->buffer); 680 c->tcp_is_reading = 1; 681 c->tcp_byte_count = 0; 682 comm_point_start_listening(c, fd, TCP_QUERY_TIMEOUT); 683} 684 685void comm_base_handle_slow_accept(int ATTR_UNUSED(fd), 686 short ATTR_UNUSED(event), void* arg) 687{ 688 struct comm_base* b = (struct comm_base*)arg; 689 /* timeout for the slow accept, re-enable accepts again */ 690 if(b->start_accept) { 691 verbose(VERB_ALGO, "wait is over, slow accept disabled"); 692 fptr_ok(fptr_whitelist_start_accept(b->start_accept)); 693 (*b->start_accept)(b->cb_arg); 694 b->eb->slow_accept_enabled = 0; 695 } 696} 697 698int comm_point_perform_accept(struct comm_point* c, 699 struct sockaddr_storage* addr, socklen_t* addrlen) 700{ 701 int new_fd; 702 *addrlen = (socklen_t)sizeof(*addr); 703 new_fd = accept(c->fd, (struct sockaddr*)addr, addrlen); 704 if(new_fd == -1) { 705#ifndef USE_WINSOCK 706 /* EINTR is signal interrupt. others are closed connection. */ 707 if( errno == EINTR || errno == EAGAIN 708#ifdef EWOULDBLOCK 709 || errno == EWOULDBLOCK 710#endif 711#ifdef ECONNABORTED 712 || errno == ECONNABORTED 713#endif 714#ifdef EPROTO 715 || errno == EPROTO 716#endif /* EPROTO */ 717 ) 718 return -1; 719#if defined(ENFILE) && defined(EMFILE) 720 if(errno == ENFILE || errno == EMFILE) { 721 /* out of file descriptors, likely outside of our 722 * control. stop accept() calls for some time */ 723 if(c->ev->base->stop_accept) { 724 struct comm_base* b = c->ev->base; 725 struct timeval tv; 726 verbose(VERB_ALGO, "out of file descriptors: " 727 "slow accept"); 728 b->eb->slow_accept_enabled = 1; 729 fptr_ok(fptr_whitelist_stop_accept( 730 b->stop_accept)); 731 (*b->stop_accept)(b->cb_arg); 732 /* set timeout, no mallocs */ 733 tv.tv_sec = NETEVENT_SLOW_ACCEPT_TIME/1000; 734 tv.tv_usec = NETEVENT_SLOW_ACCEPT_TIME%1000; 735 event_set(&b->eb->slow_accept, -1, EV_TIMEOUT, 736 comm_base_handle_slow_accept, b); 737 if(event_base_set(b->eb->base, 738 &b->eb->slow_accept) != 0) { 739 /* we do not want to log here, because 740 * that would spam the logfiles. 741 * error: "event_base_set failed." */ 742 } 743 if(event_add(&b->eb->slow_accept, &tv) != 0) { 744 /* we do not want to log here, 745 * error: "event_add failed." */ 746 } 747 } 748 return -1; 749 } 750#endif 751 log_err("accept failed: %s", strerror(errno)); 752#else /* USE_WINSOCK */ 753 if(WSAGetLastError() == WSAEINPROGRESS || 754 WSAGetLastError() == WSAECONNRESET) 755 return -1; 756 if(WSAGetLastError() == WSAEWOULDBLOCK) { 757 winsock_tcp_wouldblock(&c->ev->ev, EV_READ); 758 return -1; 759 } 760 log_err("accept failed: %s", wsa_strerror(WSAGetLastError())); 761#endif 762 log_addr(0, "remote address is", addr, *addrlen); 763 return -1; 764 } 765 fd_set_nonblock(new_fd); 766 return new_fd; 767} 768 769#ifdef USE_WINSOCK 770static long win_bio_cb(BIO *b, int oper, const char* ATTR_UNUSED(argp), 771 int ATTR_UNUSED(argi), long argl, long retvalue) 772{ 773 verbose(VERB_ALGO, "bio_cb %d, %s %s %s", oper, 774 (oper&BIO_CB_RETURN)?"return":"before", 775 (oper&BIO_CB_READ)?"read":((oper&BIO_CB_WRITE)?"write":"other"), 776 WSAGetLastError()==WSAEWOULDBLOCK?"wsawb":""); 777 /* on windows, check if previous operation caused EWOULDBLOCK */ 778 if( (oper == (BIO_CB_READ|BIO_CB_RETURN) && argl == 0) || 779 (oper == (BIO_CB_GETS|BIO_CB_RETURN) && argl == 0)) { 780 if(WSAGetLastError() == WSAEWOULDBLOCK) 781 winsock_tcp_wouldblock((struct event*) 782 BIO_get_callback_arg(b), EV_READ); 783 } 784 if( (oper == (BIO_CB_WRITE|BIO_CB_RETURN) && argl == 0) || 785 (oper == (BIO_CB_PUTS|BIO_CB_RETURN) && argl == 0)) { 786 if(WSAGetLastError() == WSAEWOULDBLOCK) 787 winsock_tcp_wouldblock((struct event*) 788 BIO_get_callback_arg(b), EV_WRITE); 789 } 790 /* return original return value */ 791 return retvalue; 792} 793 794/** set win bio callbacks for nonblocking operations */ 795void 796comm_point_tcp_win_bio_cb(struct comm_point* c, void* thessl) 797{ 798 SSL* ssl = (SSL*)thessl; 799 /* set them both just in case, but usually they are the same BIO */ 800 BIO_set_callback(SSL_get_rbio(ssl), &win_bio_cb); 801 BIO_set_callback_arg(SSL_get_rbio(ssl), (char*)&c->ev->ev); 802 BIO_set_callback(SSL_get_wbio(ssl), &win_bio_cb); 803 BIO_set_callback_arg(SSL_get_wbio(ssl), (char*)&c->ev->ev); 804} 805#endif 806 807void 808comm_point_tcp_accept_callback(int fd, short event, void* arg) 809{ 810 struct comm_point* c = (struct comm_point*)arg, *c_hdl; 811 int new_fd; 812 log_assert(c->type == comm_tcp_accept); 813 if(!(event & EV_READ)) { 814 log_info("ignoring tcp accept event %d", (int)event); 815 return; 816 } 817 comm_base_now(c->ev->base); 818 /* find free tcp handler. */ 819 if(!c->tcp_free) { 820 log_warn("accepted too many tcp, connections full"); 821 return; 822 } 823 /* accept incoming connection. */ 824 c_hdl = c->tcp_free; 825 log_assert(fd != -1); 826 new_fd = comm_point_perform_accept(c, &c_hdl->repinfo.addr, 827 &c_hdl->repinfo.addrlen); 828 if(new_fd == -1) 829 return; 830 if(c->ssl) { 831 c_hdl->ssl = incoming_ssl_fd(c->ssl, new_fd); 832 if(!c_hdl->ssl) { 833 c_hdl->fd = new_fd; 834 comm_point_close(c_hdl); 835 return; 836 } 837 c_hdl->ssl_shake_state = comm_ssl_shake_read; 838#ifdef USE_WINSOCK 839 comm_point_tcp_win_bio_cb(c_hdl, c_hdl->ssl); 840#endif 841 } 842 843 /* grab the tcp handler buffers */ 844 c->tcp_free = c_hdl->tcp_free; 845 if(!c->tcp_free) { 846 /* stop accepting incoming queries for now. */ 847 comm_point_stop_listening(c); 848 } 849 /* addr is dropped. Not needed for tcp reply. */ 850 setup_tcp_handler(c_hdl, new_fd); 851} 852 853/** Make tcp handler free for next assignment */ 854static void 855reclaim_tcp_handler(struct comm_point* c) 856{ 857 log_assert(c->type == comm_tcp); 858 if(c->ssl) { 859#ifdef HAVE_SSL 860 SSL_shutdown(c->ssl); 861 SSL_free(c->ssl); 862 c->ssl = NULL; 863#endif 864 } 865 comm_point_close(c); 866 if(c->tcp_parent) { 867 c->tcp_free = c->tcp_parent->tcp_free; 868 c->tcp_parent->tcp_free = c; 869 if(!c->tcp_free) { 870 /* re-enable listening on accept socket */ 871 comm_point_start_listening(c->tcp_parent, -1, -1); 872 } 873 } 874} 875 876/** do the callback when writing is done */ 877static void 878tcp_callback_writer(struct comm_point* c) 879{ 880 log_assert(c->type == comm_tcp); 881 ldns_buffer_clear(c->buffer); 882 if(c->tcp_do_toggle_rw) 883 c->tcp_is_reading = 1; 884 c->tcp_byte_count = 0; 885 /* switch from listening(write) to listening(read) */ 886 comm_point_stop_listening(c); 887 comm_point_start_listening(c, -1, -1); 888} 889 890/** do the callback when reading is done */ 891static void 892tcp_callback_reader(struct comm_point* c) 893{ 894 log_assert(c->type == comm_tcp || c->type == comm_local); 895 ldns_buffer_flip(c->buffer); 896 if(c->tcp_do_toggle_rw) 897 c->tcp_is_reading = 0; 898 c->tcp_byte_count = 0; 899 if(c->type == comm_tcp) 900 comm_point_stop_listening(c); 901 fptr_ok(fptr_whitelist_comm_point(c->callback)); 902 if( (*c->callback)(c, c->cb_arg, NETEVENT_NOERROR, &c->repinfo) ) { 903 comm_point_start_listening(c, -1, TCP_QUERY_TIMEOUT); 904 } 905} 906 907/** continue ssl handshake */ 908#ifdef HAVE_SSL 909static int 910ssl_handshake(struct comm_point* c) 911{ 912 int r; 913 if(c->ssl_shake_state == comm_ssl_shake_hs_read) { 914 /* read condition satisfied back to writing */ 915 comm_point_listen_for_rw(c, 1, 1); 916 c->ssl_shake_state = comm_ssl_shake_none; 917 return 1; 918 } 919 if(c->ssl_shake_state == comm_ssl_shake_hs_write) { 920 /* write condition satisfied, back to reading */ 921 comm_point_listen_for_rw(c, 1, 0); 922 c->ssl_shake_state = comm_ssl_shake_none; 923 return 1; 924 } 925 926 ERR_clear_error(); 927 r = SSL_do_handshake(c->ssl); 928 if(r != 1) { 929 int want = SSL_get_error(c->ssl, r); 930 if(want == SSL_ERROR_WANT_READ) { 931 if(c->ssl_shake_state == comm_ssl_shake_read) 932 return 1; 933 c->ssl_shake_state = comm_ssl_shake_read; 934 comm_point_listen_for_rw(c, 1, 0); 935 return 1; 936 } else if(want == SSL_ERROR_WANT_WRITE) { 937 if(c->ssl_shake_state == comm_ssl_shake_write) 938 return 1; 939 c->ssl_shake_state = comm_ssl_shake_write; 940 comm_point_listen_for_rw(c, 0, 1); 941 return 1; 942 } else if(r == 0) { 943 return 0; /* closed */ 944 } else if(want == SSL_ERROR_SYSCALL) { 945 /* SYSCALL and errno==0 means closed uncleanly */ 946 if(errno != 0) 947 log_err("SSL_handshake syscall: %s", 948 strerror(errno)); 949 return 0; 950 } else { 951 log_crypto_err("ssl handshake failed"); 952 log_addr(1, "ssl handshake failed", &c->repinfo.addr, 953 c->repinfo.addrlen); 954 return 0; 955 } 956 } 957 /* this is where peer verification could take place */ 958 log_addr(VERB_ALGO, "SSL DNS connection", &c->repinfo.addr, 959 c->repinfo.addrlen); 960 961 /* setup listen rw correctly */ 962 if(c->tcp_is_reading) { 963 if(c->ssl_shake_state != comm_ssl_shake_read) 964 comm_point_listen_for_rw(c, 1, 0); 965 } else { 966 comm_point_listen_for_rw(c, 1, 1); 967 } 968 c->ssl_shake_state = comm_ssl_shake_none; 969 return 1; 970} 971#endif /* HAVE_SSL */ 972 973/** ssl read callback on TCP */ 974static int 975ssl_handle_read(struct comm_point* c) 976{ 977#ifdef HAVE_SSL 978 int r; 979 if(c->ssl_shake_state != comm_ssl_shake_none) { 980 if(!ssl_handshake(c)) 981 return 0; 982 if(c->ssl_shake_state != comm_ssl_shake_none) 983 return 1; 984 } 985 if(c->tcp_byte_count < sizeof(uint16_t)) { 986 /* read length bytes */ 987 ERR_clear_error(); 988 if((r=SSL_read(c->ssl, (void*)ldns_buffer_at(c->buffer, 989 c->tcp_byte_count), (int)(sizeof(uint16_t) - 990 c->tcp_byte_count))) <= 0) { 991 int want = SSL_get_error(c->ssl, r); 992 if(want == SSL_ERROR_ZERO_RETURN) { 993 return 0; /* shutdown, closed */ 994 } else if(want == SSL_ERROR_WANT_READ) { 995 return 1; /* read more later */ 996 } else if(want == SSL_ERROR_WANT_WRITE) { 997 c->ssl_shake_state = comm_ssl_shake_hs_write; 998 comm_point_listen_for_rw(c, 0, 1); 999 return 1; 1000 } else if(want == SSL_ERROR_SYSCALL) { 1001 if(errno != 0) 1002 log_err("SSL_read syscall: %s", 1003 strerror(errno)); 1004 return 0; 1005 } 1006 log_crypto_err("could not SSL_read"); 1007 return 0; 1008 } 1009 c->tcp_byte_count += r; 1010 if(c->tcp_byte_count != sizeof(uint16_t)) 1011 return 1; 1012 if(ldns_buffer_read_u16_at(c->buffer, 0) > 1013 ldns_buffer_capacity(c->buffer)) { 1014 verbose(VERB_QUERY, "ssl: dropped larger than buffer"); 1015 return 0; 1016 } 1017 ldns_buffer_set_limit(c->buffer, 1018 ldns_buffer_read_u16_at(c->buffer, 0)); 1019 if(ldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) { 1020 verbose(VERB_QUERY, "ssl: dropped bogus too short."); 1021 return 0; 1022 } 1023 verbose(VERB_ALGO, "Reading ssl tcp query of length %d", 1024 (int)ldns_buffer_limit(c->buffer)); 1025 } 1026 log_assert(ldns_buffer_remaining(c->buffer) > 0); 1027 ERR_clear_error(); 1028 r = SSL_read(c->ssl, (void*)ldns_buffer_current(c->buffer), 1029 (int)ldns_buffer_remaining(c->buffer)); 1030 if(r <= 0) { 1031 int want = SSL_get_error(c->ssl, r); 1032 if(want == SSL_ERROR_ZERO_RETURN) { 1033 return 0; /* shutdown, closed */ 1034 } else if(want == SSL_ERROR_WANT_READ) { 1035 return 1; /* read more later */ 1036 } else if(want == SSL_ERROR_WANT_WRITE) { 1037 c->ssl_shake_state = comm_ssl_shake_hs_write; 1038 comm_point_listen_for_rw(c, 0, 1); 1039 return 1; 1040 } else if(want == SSL_ERROR_SYSCALL) { 1041 if(errno != 0) 1042 log_err("SSL_read syscall: %s", 1043 strerror(errno)); 1044 return 0; 1045 } 1046 log_crypto_err("could not SSL_read"); 1047 return 0; 1048 } 1049 ldns_buffer_skip(c->buffer, (ssize_t)r); 1050 if(ldns_buffer_remaining(c->buffer) <= 0) { 1051 tcp_callback_reader(c); 1052 } 1053 return 1; 1054#else 1055 (void)c; 1056 return 0; 1057#endif /* HAVE_SSL */ 1058} 1059 1060/** ssl write callback on TCP */ 1061static int 1062ssl_handle_write(struct comm_point* c) 1063{ 1064#ifdef HAVE_SSL 1065 int r; 1066 if(c->ssl_shake_state != comm_ssl_shake_none) { 1067 if(!ssl_handshake(c)) 1068 return 0; 1069 if(c->ssl_shake_state != comm_ssl_shake_none) 1070 return 1; 1071 } 1072 /* ignore return, if fails we may simply block */ 1073 (void)SSL_set_mode(c->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE); 1074 if(c->tcp_byte_count < sizeof(uint16_t)) { 1075 uint16_t len = htons(ldns_buffer_limit(c->buffer)); 1076 ERR_clear_error(); 1077 r = SSL_write(c->ssl, 1078 (void*)(((uint8_t*)&len)+c->tcp_byte_count), 1079 (int)(sizeof(uint16_t)-c->tcp_byte_count)); 1080 if(r <= 0) { 1081 int want = SSL_get_error(c->ssl, r); 1082 if(want == SSL_ERROR_ZERO_RETURN) { 1083 return 0; /* closed */ 1084 } else if(want == SSL_ERROR_WANT_READ) { 1085 c->ssl_shake_state = comm_ssl_shake_read; 1086 comm_point_listen_for_rw(c, 1, 0); 1087 return 1; /* wait for read condition */ 1088 } else if(want == SSL_ERROR_WANT_WRITE) { 1089 return 1; /* write more later */ 1090 } else if(want == SSL_ERROR_SYSCALL) { 1091 if(errno != 0) 1092 log_err("SSL_write syscall: %s", 1093 strerror(errno)); 1094 return 0; 1095 } 1096 log_crypto_err("could not SSL_write"); 1097 return 0; 1098 } 1099 c->tcp_byte_count += r; 1100 if(c->tcp_byte_count < sizeof(uint16_t)) 1101 return 1; 1102 ldns_buffer_set_position(c->buffer, c->tcp_byte_count - 1103 sizeof(uint16_t)); 1104 if(ldns_buffer_remaining(c->buffer) == 0) { 1105 tcp_callback_writer(c); 1106 return 1; 1107 } 1108 } 1109 log_assert(ldns_buffer_remaining(c->buffer) > 0); 1110 ERR_clear_error(); 1111 r = SSL_write(c->ssl, (void*)ldns_buffer_current(c->buffer), 1112 (int)ldns_buffer_remaining(c->buffer)); 1113 if(r <= 0) { 1114 int want = SSL_get_error(c->ssl, r); 1115 if(want == SSL_ERROR_ZERO_RETURN) { 1116 return 0; /* closed */ 1117 } else if(want == SSL_ERROR_WANT_READ) { 1118 c->ssl_shake_state = comm_ssl_shake_read; 1119 comm_point_listen_for_rw(c, 1, 0); 1120 return 1; /* wait for read condition */ 1121 } else if(want == SSL_ERROR_WANT_WRITE) { 1122 return 1; /* write more later */ 1123 } else if(want == SSL_ERROR_SYSCALL) { 1124 if(errno != 0) 1125 log_err("SSL_write syscall: %s", 1126 strerror(errno)); 1127 return 0; 1128 } 1129 log_crypto_err("could not SSL_write"); 1130 return 0; 1131 } 1132 ldns_buffer_skip(c->buffer, (ssize_t)r); 1133 1134 if(ldns_buffer_remaining(c->buffer) == 0) { 1135 tcp_callback_writer(c); 1136 } 1137 return 1; 1138#else 1139 (void)c; 1140 return 0; 1141#endif /* HAVE_SSL */ 1142} 1143 1144/** handle ssl tcp connection with dns contents */ 1145static int 1146ssl_handle_it(struct comm_point* c) 1147{ 1148 if(c->tcp_is_reading) 1149 return ssl_handle_read(c); 1150 return ssl_handle_write(c); 1151} 1152 1153/** Handle tcp reading callback. 1154 * @param fd: file descriptor of socket. 1155 * @param c: comm point to read from into buffer. 1156 * @param short_ok: if true, very short packets are OK (for comm_local). 1157 * @return: 0 on error 1158 */ 1159static int 1160comm_point_tcp_handle_read(int fd, struct comm_point* c, int short_ok) 1161{ 1162 ssize_t r; 1163 log_assert(c->type == comm_tcp || c->type == comm_local); 1164 if(c->ssl) 1165 return ssl_handle_it(c); 1166 if(!c->tcp_is_reading) 1167 return 0; 1168 1169 log_assert(fd != -1); 1170 if(c->tcp_byte_count < sizeof(uint16_t)) { 1171 /* read length bytes */ 1172 r = recv(fd,(void*)ldns_buffer_at(c->buffer,c->tcp_byte_count), 1173 sizeof(uint16_t)-c->tcp_byte_count, 0); 1174 if(r == 0) 1175 return 0; 1176 else if(r == -1) { 1177#ifndef USE_WINSOCK 1178 if(errno == EINTR || errno == EAGAIN) 1179 return 1; 1180#ifdef ECONNRESET 1181 if(errno == ECONNRESET && verbosity < 2) 1182 return 0; /* silence reset by peer */ 1183#endif 1184 log_err("read (in tcp s): %s", strerror(errno)); 1185#else /* USE_WINSOCK */ 1186 if(WSAGetLastError() == WSAECONNRESET) 1187 return 0; 1188 if(WSAGetLastError() == WSAEINPROGRESS) 1189 return 1; 1190 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1191 winsock_tcp_wouldblock(&c->ev->ev, EV_READ); 1192 return 1; 1193 } 1194 log_err("read (in tcp s): %s", 1195 wsa_strerror(WSAGetLastError())); 1196#endif 1197 log_addr(0, "remote address is", &c->repinfo.addr, 1198 c->repinfo.addrlen); 1199 return 0; 1200 } 1201 c->tcp_byte_count += r; 1202 if(c->tcp_byte_count != sizeof(uint16_t)) 1203 return 1; 1204 if(ldns_buffer_read_u16_at(c->buffer, 0) > 1205 ldns_buffer_capacity(c->buffer)) { 1206 verbose(VERB_QUERY, "tcp: dropped larger than buffer"); 1207 return 0; 1208 } 1209 ldns_buffer_set_limit(c->buffer, 1210 ldns_buffer_read_u16_at(c->buffer, 0)); 1211 if(!short_ok && 1212 ldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) { 1213 verbose(VERB_QUERY, "tcp: dropped bogus too short."); 1214 return 0; 1215 } 1216 verbose(VERB_ALGO, "Reading tcp query of length %d", 1217 (int)ldns_buffer_limit(c->buffer)); 1218 } 1219 1220 log_assert(ldns_buffer_remaining(c->buffer) > 0); 1221 r = recv(fd, (void*)ldns_buffer_current(c->buffer), 1222 ldns_buffer_remaining(c->buffer), 0); 1223 if(r == 0) { 1224 return 0; 1225 } else if(r == -1) { 1226#ifndef USE_WINSOCK 1227 if(errno == EINTR || errno == EAGAIN) 1228 return 1; 1229 log_err("read (in tcp r): %s", strerror(errno)); 1230#else /* USE_WINSOCK */ 1231 if(WSAGetLastError() == WSAECONNRESET) 1232 return 0; 1233 if(WSAGetLastError() == WSAEINPROGRESS) 1234 return 1; 1235 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1236 winsock_tcp_wouldblock(&c->ev->ev, EV_READ); 1237 return 1; 1238 } 1239 log_err("read (in tcp r): %s", 1240 wsa_strerror(WSAGetLastError())); 1241#endif 1242 log_addr(0, "remote address is", &c->repinfo.addr, 1243 c->repinfo.addrlen); 1244 return 0; 1245 } 1246 ldns_buffer_skip(c->buffer, r); 1247 if(ldns_buffer_remaining(c->buffer) <= 0) { 1248 tcp_callback_reader(c); 1249 } 1250 return 1; 1251} 1252 1253/** 1254 * Handle tcp writing callback. 1255 * @param fd: file descriptor of socket. 1256 * @param c: comm point to write buffer out of. 1257 * @return: 0 on error 1258 */ 1259static int 1260comm_point_tcp_handle_write(int fd, struct comm_point* c) 1261{ 1262 ssize_t r; 1263 log_assert(c->type == comm_tcp); 1264 if(c->tcp_is_reading && !c->ssl) 1265 return 0; 1266 log_assert(fd != -1); 1267 if(c->tcp_byte_count == 0 && c->tcp_check_nb_connect) { 1268 /* check for pending error from nonblocking connect */ 1269 /* from Stevens, unix network programming, vol1, 3rd ed, p450*/ 1270 int error = 0; 1271 socklen_t len = (socklen_t)sizeof(error); 1272 if(getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&error, 1273 &len) < 0){ 1274#ifndef USE_WINSOCK 1275 error = errno; /* on solaris errno is error */ 1276#else /* USE_WINSOCK */ 1277 error = WSAGetLastError(); 1278#endif 1279 } 1280#ifndef USE_WINSOCK 1281#if defined(EINPROGRESS) && defined(EWOULDBLOCK) 1282 if(error == EINPROGRESS || error == EWOULDBLOCK) 1283 return 1; /* try again later */ 1284 else 1285#endif 1286 if(error != 0 && verbosity < 2) 1287 return 0; /* silence lots of chatter in the logs */ 1288 else if(error != 0) { 1289 log_err("tcp connect: %s", strerror(error)); 1290#else /* USE_WINSOCK */ 1291 /* examine error */ 1292 if(error == WSAEINPROGRESS) 1293 return 1; 1294 else if(error == WSAEWOULDBLOCK) { 1295 winsock_tcp_wouldblock(&c->ev->ev, EV_WRITE); 1296 return 1; 1297 } else if(error != 0 && verbosity < 2) 1298 return 0; 1299 else if(error != 0) { 1300 log_err("tcp connect: %s", wsa_strerror(error)); 1301#endif /* USE_WINSOCK */ 1302 log_addr(0, "remote address is", &c->repinfo.addr, 1303 c->repinfo.addrlen); 1304 return 0; 1305 } 1306 } 1307 if(c->ssl) 1308 return ssl_handle_it(c); 1309 1310 if(c->tcp_byte_count < sizeof(uint16_t)) { 1311 uint16_t len = htons(ldns_buffer_limit(c->buffer)); 1312#ifdef HAVE_WRITEV 1313 struct iovec iov[2]; 1314 iov[0].iov_base = (uint8_t*)&len + c->tcp_byte_count; 1315 iov[0].iov_len = sizeof(uint16_t) - c->tcp_byte_count; 1316 iov[1].iov_base = ldns_buffer_begin(c->buffer); 1317 iov[1].iov_len = ldns_buffer_limit(c->buffer); 1318 log_assert(iov[0].iov_len > 0); 1319 log_assert(iov[1].iov_len > 0); 1320 r = writev(fd, iov, 2); 1321#else /* HAVE_WRITEV */ 1322 r = send(fd, (void*)(((uint8_t*)&len)+c->tcp_byte_count), 1323 sizeof(uint16_t)-c->tcp_byte_count, 0); 1324#endif /* HAVE_WRITEV */ 1325 if(r == -1) { 1326#ifndef USE_WINSOCK 1327#ifdef EPIPE 1328 if(errno == EPIPE && verbosity < 2) 1329 return 0; /* silence 'broken pipe' */ 1330#endif 1331 if(errno == EINTR || errno == EAGAIN) 1332 return 1; 1333 log_err("tcp writev: %s", strerror(errno)); 1334#else 1335 if(WSAGetLastError() == WSAENOTCONN) 1336 return 1; 1337 if(WSAGetLastError() == WSAEINPROGRESS) 1338 return 1; 1339 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1340 winsock_tcp_wouldblock(&c->ev->ev, EV_WRITE); 1341 return 1; 1342 } 1343 log_err("tcp send s: %s", 1344 wsa_strerror(WSAGetLastError())); 1345#endif 1346 log_addr(0, "remote address is", &c->repinfo.addr, 1347 c->repinfo.addrlen); 1348 return 0; 1349 } 1350 c->tcp_byte_count += r; 1351 if(c->tcp_byte_count < sizeof(uint16_t)) 1352 return 1; 1353 ldns_buffer_set_position(c->buffer, c->tcp_byte_count - 1354 sizeof(uint16_t)); 1355 if(ldns_buffer_remaining(c->buffer) == 0) { 1356 tcp_callback_writer(c); 1357 return 1; 1358 } 1359 } 1360 log_assert(ldns_buffer_remaining(c->buffer) > 0); 1361 r = send(fd, (void*)ldns_buffer_current(c->buffer), 1362 ldns_buffer_remaining(c->buffer), 0); 1363 if(r == -1) { 1364#ifndef USE_WINSOCK 1365 if(errno == EINTR || errno == EAGAIN) 1366 return 1; 1367 log_err("tcp send r: %s", strerror(errno)); 1368#else 1369 if(WSAGetLastError() == WSAEINPROGRESS) 1370 return 1; 1371 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1372 winsock_tcp_wouldblock(&c->ev->ev, EV_WRITE); 1373 return 1; 1374 } 1375 log_err("tcp send r: %s", 1376 wsa_strerror(WSAGetLastError())); 1377#endif 1378 log_addr(0, "remote address is", &c->repinfo.addr, 1379 c->repinfo.addrlen); 1380 return 0; 1381 } 1382 ldns_buffer_skip(c->buffer, r); 1383 1384 if(ldns_buffer_remaining(c->buffer) == 0) { 1385 tcp_callback_writer(c); 1386 } 1387 1388 return 1; 1389} 1390 1391void 1392comm_point_tcp_handle_callback(int fd, short event, void* arg) 1393{ 1394 struct comm_point* c = (struct comm_point*)arg; 1395 log_assert(c->type == comm_tcp); 1396 comm_base_now(c->ev->base); 1397 1398 if(event&EV_READ) { 1399 if(!comm_point_tcp_handle_read(fd, c, 0)) { 1400 reclaim_tcp_handler(c); 1401 if(!c->tcp_do_close) { 1402 fptr_ok(fptr_whitelist_comm_point( 1403 c->callback)); 1404 (void)(*c->callback)(c, c->cb_arg, 1405 NETEVENT_CLOSED, NULL); 1406 } 1407 } 1408 return; 1409 } 1410 if(event&EV_WRITE) { 1411 if(!comm_point_tcp_handle_write(fd, c)) { 1412 reclaim_tcp_handler(c); 1413 if(!c->tcp_do_close) { 1414 fptr_ok(fptr_whitelist_comm_point( 1415 c->callback)); 1416 (void)(*c->callback)(c, c->cb_arg, 1417 NETEVENT_CLOSED, NULL); 1418 } 1419 } 1420 return; 1421 } 1422 if(event&EV_TIMEOUT) { 1423 verbose(VERB_QUERY, "tcp took too long, dropped"); 1424 reclaim_tcp_handler(c); 1425 if(!c->tcp_do_close) { 1426 fptr_ok(fptr_whitelist_comm_point(c->callback)); 1427 (void)(*c->callback)(c, c->cb_arg, 1428 NETEVENT_TIMEOUT, NULL); 1429 } 1430 return; 1431 } 1432 log_err("Ignored event %d for tcphdl.", event); 1433} 1434 1435void comm_point_local_handle_callback(int fd, short event, void* arg) 1436{ 1437 struct comm_point* c = (struct comm_point*)arg; 1438 log_assert(c->type == comm_local); 1439 comm_base_now(c->ev->base); 1440 1441 if(event&EV_READ) { 1442 if(!comm_point_tcp_handle_read(fd, c, 1)) { 1443 fptr_ok(fptr_whitelist_comm_point(c->callback)); 1444 (void)(*c->callback)(c, c->cb_arg, NETEVENT_CLOSED, 1445 NULL); 1446 } 1447 return; 1448 } 1449 log_err("Ignored event %d for localhdl.", event); 1450} 1451 1452void comm_point_raw_handle_callback(int ATTR_UNUSED(fd), 1453 short event, void* arg) 1454{ 1455 struct comm_point* c = (struct comm_point*)arg; 1456 int err = NETEVENT_NOERROR; 1457 log_assert(c->type == comm_raw); 1458 comm_base_now(c->ev->base); 1459 1460 if(event&EV_TIMEOUT) 1461 err = NETEVENT_TIMEOUT; 1462 fptr_ok(fptr_whitelist_comm_point_raw(c->callback)); 1463 (void)(*c->callback)(c, c->cb_arg, err, NULL); 1464} 1465 1466struct comm_point* 1467comm_point_create_udp(struct comm_base *base, int fd, ldns_buffer* buffer, 1468 comm_point_callback_t* callback, void* callback_arg) 1469{ 1470 struct comm_point* c = (struct comm_point*)calloc(1, 1471 sizeof(struct comm_point)); 1472 short evbits; 1473 if(!c) 1474 return NULL; 1475 c->ev = (struct internal_event*)calloc(1, 1476 sizeof(struct internal_event)); 1477 if(!c->ev) { 1478 free(c); 1479 return NULL; 1480 } 1481 c->ev->base = base; 1482 c->fd = fd; 1483 c->buffer = buffer; 1484 c->timeout = NULL; 1485 c->tcp_is_reading = 0; 1486 c->tcp_byte_count = 0; 1487 c->tcp_parent = NULL; 1488 c->max_tcp_count = 0; 1489 c->tcp_handlers = NULL; 1490 c->tcp_free = NULL; 1491 c->type = comm_udp; 1492 c->tcp_do_close = 0; 1493 c->do_not_close = 0; 1494 c->tcp_do_toggle_rw = 0; 1495 c->tcp_check_nb_connect = 0; 1496 c->inuse = 0; 1497 c->callback = callback; 1498 c->cb_arg = callback_arg; 1499 evbits = EV_READ | EV_PERSIST; 1500 /* libevent stuff */ 1501 event_set(&c->ev->ev, c->fd, evbits, comm_point_udp_callback, c); 1502 if(event_base_set(base->eb->base, &c->ev->ev) != 0) { 1503 log_err("could not baseset udp event"); 1504 comm_point_delete(c); 1505 return NULL; 1506 } 1507 if(fd!=-1 && event_add(&c->ev->ev, c->timeout) != 0 ) { 1508 log_err("could not add udp event"); 1509 comm_point_delete(c); 1510 return NULL; 1511 } 1512 return c; 1513} 1514 1515struct comm_point* 1516comm_point_create_udp_ancil(struct comm_base *base, int fd, 1517 ldns_buffer* buffer, 1518 comm_point_callback_t* callback, void* callback_arg) 1519{ 1520 struct comm_point* c = (struct comm_point*)calloc(1, 1521 sizeof(struct comm_point)); 1522 short evbits; 1523 if(!c) 1524 return NULL; 1525 c->ev = (struct internal_event*)calloc(1, 1526 sizeof(struct internal_event)); 1527 if(!c->ev) { 1528 free(c); 1529 return NULL; 1530 } 1531 c->ev->base = base; 1532 c->fd = fd; 1533 c->buffer = buffer; 1534 c->timeout = NULL; 1535 c->tcp_is_reading = 0; 1536 c->tcp_byte_count = 0; 1537 c->tcp_parent = NULL; 1538 c->max_tcp_count = 0; 1539 c->tcp_handlers = NULL; 1540 c->tcp_free = NULL; 1541 c->type = comm_udp; 1542 c->tcp_do_close = 0; 1543 c->do_not_close = 0; 1544 c->inuse = 0; 1545 c->tcp_do_toggle_rw = 0; 1546 c->tcp_check_nb_connect = 0; 1547 c->callback = callback; 1548 c->cb_arg = callback_arg; 1549 evbits = EV_READ | EV_PERSIST; 1550 /* libevent stuff */ 1551 event_set(&c->ev->ev, c->fd, evbits, comm_point_udp_ancil_callback, c); 1552 if(event_base_set(base->eb->base, &c->ev->ev) != 0) { 1553 log_err("could not baseset udp event"); 1554 comm_point_delete(c); 1555 return NULL; 1556 } 1557 if(fd!=-1 && event_add(&c->ev->ev, c->timeout) != 0 ) { 1558 log_err("could not add udp event"); 1559 comm_point_delete(c); 1560 return NULL; 1561 } 1562 return c; 1563} 1564 1565static struct comm_point* 1566comm_point_create_tcp_handler(struct comm_base *base, 1567 struct comm_point* parent, size_t bufsize, 1568 comm_point_callback_t* callback, void* callback_arg) 1569{ 1570 struct comm_point* c = (struct comm_point*)calloc(1, 1571 sizeof(struct comm_point)); 1572 short evbits; 1573 if(!c) 1574 return NULL; 1575 c->ev = (struct internal_event*)calloc(1, 1576 sizeof(struct internal_event)); 1577 if(!c->ev) { 1578 free(c); 1579 return NULL; 1580 } 1581 c->ev->base = base; 1582 c->fd = -1; 1583 c->buffer = ldns_buffer_new(bufsize); 1584 if(!c->buffer) { 1585 free(c->ev); 1586 free(c); 1587 return NULL; 1588 } 1589 c->timeout = (struct timeval*)malloc(sizeof(struct timeval)); 1590 if(!c->timeout) { 1591 ldns_buffer_free(c->buffer); 1592 free(c->ev); 1593 free(c); 1594 return NULL; 1595 } 1596 c->tcp_is_reading = 0; 1597 c->tcp_byte_count = 0; 1598 c->tcp_parent = parent; 1599 c->max_tcp_count = 0; 1600 c->tcp_handlers = NULL; 1601 c->tcp_free = NULL; 1602 c->type = comm_tcp; 1603 c->tcp_do_close = 0; 1604 c->do_not_close = 0; 1605 c->tcp_do_toggle_rw = 1; 1606 c->tcp_check_nb_connect = 0; 1607 c->repinfo.c = c; 1608 c->callback = callback; 1609 c->cb_arg = callback_arg; 1610 /* add to parent free list */ 1611 c->tcp_free = parent->tcp_free; 1612 parent->tcp_free = c; 1613 /* libevent stuff */ 1614 evbits = EV_PERSIST | EV_READ | EV_TIMEOUT; 1615 event_set(&c->ev->ev, c->fd, evbits, comm_point_tcp_handle_callback, c); 1616 if(event_base_set(base->eb->base, &c->ev->ev) != 0) 1617 { 1618 log_err("could not basetset tcphdl event"); 1619 parent->tcp_free = c->tcp_free; 1620 free(c->ev); 1621 free(c); 1622 return NULL; 1623 } 1624 return c; 1625} 1626 1627struct comm_point* 1628comm_point_create_tcp(struct comm_base *base, int fd, int num, size_t bufsize, 1629 comm_point_callback_t* callback, void* callback_arg) 1630{ 1631 struct comm_point* c = (struct comm_point*)calloc(1, 1632 sizeof(struct comm_point)); 1633 short evbits; 1634 int i; 1635 /* first allocate the TCP accept listener */ 1636 if(!c) 1637 return NULL; 1638 c->ev = (struct internal_event*)calloc(1, 1639 sizeof(struct internal_event)); 1640 if(!c->ev) { 1641 free(c); 1642 return NULL; 1643 } 1644 c->ev->base = base; 1645 c->fd = fd; 1646 c->buffer = NULL; 1647 c->timeout = NULL; 1648 c->tcp_is_reading = 0; 1649 c->tcp_byte_count = 0; 1650 c->tcp_parent = NULL; 1651 c->max_tcp_count = num; 1652 c->tcp_handlers = (struct comm_point**)calloc((size_t)num, 1653 sizeof(struct comm_point*)); 1654 if(!c->tcp_handlers) { 1655 free(c->ev); 1656 free(c); 1657 return NULL; 1658 } 1659 c->tcp_free = NULL; 1660 c->type = comm_tcp_accept; 1661 c->tcp_do_close = 0; 1662 c->do_not_close = 0; 1663 c->tcp_do_toggle_rw = 0; 1664 c->tcp_check_nb_connect = 0; 1665 c->callback = NULL; 1666 c->cb_arg = NULL; 1667 evbits = EV_READ | EV_PERSIST; 1668 /* libevent stuff */ 1669 event_set(&c->ev->ev, c->fd, evbits, comm_point_tcp_accept_callback, c); 1670 if(event_base_set(base->eb->base, &c->ev->ev) != 0 || 1671 event_add(&c->ev->ev, c->timeout) != 0 ) 1672 { 1673 log_err("could not add tcpacc event"); 1674 comm_point_delete(c); 1675 return NULL; 1676 } 1677 1678 /* now prealloc the tcp handlers */ 1679 for(i=0; i<num; i++) { 1680 c->tcp_handlers[i] = comm_point_create_tcp_handler(base, 1681 c, bufsize, callback, callback_arg); 1682 if(!c->tcp_handlers[i]) { 1683 comm_point_delete(c); 1684 return NULL; 1685 } 1686 } 1687 1688 return c; 1689} 1690 1691struct comm_point* 1692comm_point_create_tcp_out(struct comm_base *base, size_t bufsize, 1693 comm_point_callback_t* callback, void* callback_arg) 1694{ 1695 struct comm_point* c = (struct comm_point*)calloc(1, 1696 sizeof(struct comm_point)); 1697 short evbits; 1698 if(!c) 1699 return NULL; 1700 c->ev = (struct internal_event*)calloc(1, 1701 sizeof(struct internal_event)); 1702 if(!c->ev) { 1703 free(c); 1704 return NULL; 1705 } 1706 c->ev->base = base; 1707 c->fd = -1; 1708 c->buffer = ldns_buffer_new(bufsize); 1709 if(!c->buffer) { 1710 free(c->ev); 1711 free(c); 1712 return NULL; 1713 } 1714 c->timeout = NULL; 1715 c->tcp_is_reading = 0; 1716 c->tcp_byte_count = 0; 1717 c->tcp_parent = NULL; 1718 c->max_tcp_count = 0; 1719 c->tcp_handlers = NULL; 1720 c->tcp_free = NULL; 1721 c->type = comm_tcp; 1722 c->tcp_do_close = 0; 1723 c->do_not_close = 0; 1724 c->tcp_do_toggle_rw = 1; 1725 c->tcp_check_nb_connect = 1; 1726 c->repinfo.c = c; 1727 c->callback = callback; 1728 c->cb_arg = callback_arg; 1729 evbits = EV_PERSIST | EV_WRITE; 1730 event_set(&c->ev->ev, c->fd, evbits, comm_point_tcp_handle_callback, c); 1731 if(event_base_set(base->eb->base, &c->ev->ev) != 0) 1732 { 1733 log_err("could not basetset tcpout event"); 1734 ldns_buffer_free(c->buffer); 1735 free(c->ev); 1736 free(c); 1737 return NULL; 1738 } 1739 1740 return c; 1741} 1742 1743struct comm_point* 1744comm_point_create_local(struct comm_base *base, int fd, size_t bufsize, 1745 comm_point_callback_t* callback, void* callback_arg) 1746{ 1747 struct comm_point* c = (struct comm_point*)calloc(1, 1748 sizeof(struct comm_point)); 1749 short evbits; 1750 if(!c) 1751 return NULL; 1752 c->ev = (struct internal_event*)calloc(1, 1753 sizeof(struct internal_event)); 1754 if(!c->ev) { 1755 free(c); 1756 return NULL; 1757 } 1758 c->ev->base = base; 1759 c->fd = fd; 1760 c->buffer = ldns_buffer_new(bufsize); 1761 if(!c->buffer) { 1762 free(c->ev); 1763 free(c); 1764 return NULL; 1765 } 1766 c->timeout = NULL; 1767 c->tcp_is_reading = 1; 1768 c->tcp_byte_count = 0; 1769 c->tcp_parent = NULL; 1770 c->max_tcp_count = 0; 1771 c->tcp_handlers = NULL; 1772 c->tcp_free = NULL; 1773 c->type = comm_local; 1774 c->tcp_do_close = 0; 1775 c->do_not_close = 1; 1776 c->tcp_do_toggle_rw = 0; 1777 c->tcp_check_nb_connect = 0; 1778 c->callback = callback; 1779 c->cb_arg = callback_arg; 1780 /* libevent stuff */ 1781 evbits = EV_PERSIST | EV_READ; 1782 event_set(&c->ev->ev, c->fd, evbits, comm_point_local_handle_callback, 1783 c); 1784 if(event_base_set(base->eb->base, &c->ev->ev) != 0 || 1785 event_add(&c->ev->ev, c->timeout) != 0 ) 1786 { 1787 log_err("could not add localhdl event"); 1788 free(c->ev); 1789 free(c); 1790 return NULL; 1791 } 1792 return c; 1793} 1794 1795struct comm_point* 1796comm_point_create_raw(struct comm_base* base, int fd, int writing, 1797 comm_point_callback_t* callback, void* callback_arg) 1798{ 1799 struct comm_point* c = (struct comm_point*)calloc(1, 1800 sizeof(struct comm_point)); 1801 short evbits; 1802 if(!c) 1803 return NULL; 1804 c->ev = (struct internal_event*)calloc(1, 1805 sizeof(struct internal_event)); 1806 if(!c->ev) { 1807 free(c); 1808 return NULL; 1809 } 1810 c->ev->base = base; 1811 c->fd = fd; 1812 c->buffer = NULL; 1813 c->timeout = NULL; 1814 c->tcp_is_reading = 0; 1815 c->tcp_byte_count = 0; 1816 c->tcp_parent = NULL; 1817 c->max_tcp_count = 0; 1818 c->tcp_handlers = NULL; 1819 c->tcp_free = NULL; 1820 c->type = comm_raw; 1821 c->tcp_do_close = 0; 1822 c->do_not_close = 1; 1823 c->tcp_do_toggle_rw = 0; 1824 c->tcp_check_nb_connect = 0; 1825 c->callback = callback; 1826 c->cb_arg = callback_arg; 1827 /* libevent stuff */ 1828 if(writing) 1829 evbits = EV_PERSIST | EV_WRITE; 1830 else evbits = EV_PERSIST | EV_READ; 1831 event_set(&c->ev->ev, c->fd, evbits, comm_point_raw_handle_callback, 1832 c); 1833 if(event_base_set(base->eb->base, &c->ev->ev) != 0 || 1834 event_add(&c->ev->ev, c->timeout) != 0 ) 1835 { 1836 log_err("could not add rawhdl event"); 1837 free(c->ev); 1838 free(c); 1839 return NULL; 1840 } 1841 return c; 1842} 1843 1844void 1845comm_point_close(struct comm_point* c) 1846{ 1847 if(!c) 1848 return; 1849 if(c->fd != -1) 1850 if(event_del(&c->ev->ev) != 0) { 1851 log_err("could not event_del on close"); 1852 } 1853 /* close fd after removing from event lists, or epoll.. is messed up */ 1854 if(c->fd != -1 && !c->do_not_close) { 1855 verbose(VERB_ALGO, "close fd %d", c->fd); 1856#ifndef USE_WINSOCK 1857 close(c->fd); 1858#else 1859 closesocket(c->fd); 1860#endif 1861 } 1862 c->fd = -1; 1863} 1864 1865void 1866comm_point_delete(struct comm_point* c) 1867{ 1868 if(!c) 1869 return; 1870 if(c->type == comm_tcp && c->ssl) { 1871#ifdef HAVE_SSL 1872 SSL_shutdown(c->ssl); 1873 SSL_free(c->ssl); 1874#endif 1875 } 1876 comm_point_close(c); 1877 if(c->tcp_handlers) { 1878 int i; 1879 for(i=0; i<c->max_tcp_count; i++) 1880 comm_point_delete(c->tcp_handlers[i]); 1881 free(c->tcp_handlers); 1882 } 1883 free(c->timeout); 1884 if(c->type == comm_tcp || c->type == comm_local) 1885 ldns_buffer_free(c->buffer); 1886 free(c->ev); 1887 free(c); 1888} 1889 1890void 1891comm_point_send_reply(struct comm_reply *repinfo) 1892{ 1893 log_assert(repinfo && repinfo->c); 1894 if(repinfo->c->type == comm_udp) { 1895 if(repinfo->srctype) 1896 comm_point_send_udp_msg_if(repinfo->c, 1897 repinfo->c->buffer, (struct sockaddr*)&repinfo->addr, 1898 repinfo->addrlen, repinfo); 1899 else 1900 comm_point_send_udp_msg(repinfo->c, repinfo->c->buffer, 1901 (struct sockaddr*)&repinfo->addr, repinfo->addrlen); 1902 } else { 1903 comm_point_start_listening(repinfo->c, -1, TCP_QUERY_TIMEOUT); 1904 } 1905} 1906 1907void 1908comm_point_drop_reply(struct comm_reply* repinfo) 1909{ 1910 if(!repinfo) 1911 return; 1912 log_assert(repinfo && repinfo->c); 1913 log_assert(repinfo->c->type != comm_tcp_accept); 1914 if(repinfo->c->type == comm_udp) 1915 return; 1916 reclaim_tcp_handler(repinfo->c); 1917} 1918 1919void 1920comm_point_stop_listening(struct comm_point* c) 1921{ 1922 verbose(VERB_ALGO, "comm point stop listening %d", c->fd); 1923 if(event_del(&c->ev->ev) != 0) { 1924 log_err("event_del error to stoplisten"); 1925 } 1926} 1927 1928void 1929comm_point_start_listening(struct comm_point* c, int newfd, int sec) 1930{ 1931 verbose(VERB_ALGO, "comm point start listening %d", 1932 c->fd==-1?newfd:c->fd); 1933 if(c->type == comm_tcp_accept && !c->tcp_free) { 1934 /* no use to start listening no free slots. */ 1935 return; 1936 } 1937 if(sec != -1 && sec != 0) { 1938 if(!c->timeout) { 1939 c->timeout = (struct timeval*)malloc(sizeof( 1940 struct timeval)); 1941 if(!c->timeout) { 1942 log_err("cpsl: malloc failed. No net read."); 1943 return; 1944 } 1945 } 1946 c->ev->ev.ev_events |= EV_TIMEOUT; 1947#ifndef S_SPLINT_S /* splint fails on struct timeval. */ 1948 c->timeout->tv_sec = sec; 1949 c->timeout->tv_usec = 0; 1950#endif /* S_SPLINT_S */ 1951 } 1952 if(c->type == comm_tcp) { 1953 c->ev->ev.ev_events &= ~(EV_READ|EV_WRITE); 1954 if(c->tcp_is_reading) 1955 c->ev->ev.ev_events |= EV_READ; 1956 else c->ev->ev.ev_events |= EV_WRITE; 1957 } 1958 if(newfd != -1) { 1959 if(c->fd != -1) { 1960#ifndef USE_WINSOCK 1961 close(c->fd); 1962#else 1963 closesocket(c->fd); 1964#endif 1965 } 1966 c->fd = newfd; 1967 c->ev->ev.ev_fd = c->fd; 1968 } 1969 if(event_add(&c->ev->ev, sec==0?NULL:c->timeout) != 0) { 1970 log_err("event_add failed. in cpsl."); 1971 } 1972} 1973 1974void comm_point_listen_for_rw(struct comm_point* c, int rd, int wr) 1975{ 1976 verbose(VERB_ALGO, "comm point listen_for_rw %d %d", c->fd, wr); 1977 if(event_del(&c->ev->ev) != 0) { 1978 log_err("event_del error to cplf"); 1979 } 1980 c->ev->ev.ev_events &= ~(EV_READ|EV_WRITE); 1981 if(rd) c->ev->ev.ev_events |= EV_READ; 1982 if(wr) c->ev->ev.ev_events |= EV_WRITE; 1983 if(event_add(&c->ev->ev, c->timeout) != 0) { 1984 log_err("event_add failed. in cplf."); 1985 } 1986} 1987 1988size_t comm_point_get_mem(struct comm_point* c) 1989{ 1990 size_t s; 1991 if(!c) 1992 return 0; 1993 s = sizeof(*c) + sizeof(*c->ev); 1994 if(c->timeout) 1995 s += sizeof(*c->timeout); 1996 if(c->type == comm_tcp || c->type == comm_local) 1997 s += sizeof(*c->buffer) + ldns_buffer_capacity(c->buffer); 1998 if(c->type == comm_tcp_accept) { 1999 int i; 2000 for(i=0; i<c->max_tcp_count; i++) 2001 s += comm_point_get_mem(c->tcp_handlers[i]); 2002 } 2003 return s; 2004} 2005 2006struct comm_timer* 2007comm_timer_create(struct comm_base* base, void (*cb)(void*), void* cb_arg) 2008{ 2009 struct comm_timer *tm = (struct comm_timer*)calloc(1, 2010 sizeof(struct comm_timer)); 2011 if(!tm) 2012 return NULL; 2013 tm->ev_timer = (struct internal_timer*)calloc(1, 2014 sizeof(struct internal_timer)); 2015 if(!tm->ev_timer) { 2016 log_err("malloc failed"); 2017 free(tm); 2018 return NULL; 2019 } 2020 tm->ev_timer->base = base; 2021 tm->callback = cb; 2022 tm->cb_arg = cb_arg; 2023 event_set(&tm->ev_timer->ev, -1, EV_TIMEOUT, 2024 comm_timer_callback, tm); 2025 if(event_base_set(base->eb->base, &tm->ev_timer->ev) != 0) { 2026 log_err("timer_create: event_base_set failed."); 2027 free(tm->ev_timer); 2028 free(tm); 2029 return NULL; 2030 } 2031 return tm; 2032} 2033 2034void 2035comm_timer_disable(struct comm_timer* timer) 2036{ 2037 if(!timer) 2038 return; 2039 evtimer_del(&timer->ev_timer->ev); 2040 timer->ev_timer->enabled = 0; 2041} 2042 2043void 2044comm_timer_set(struct comm_timer* timer, struct timeval* tv) 2045{ 2046 log_assert(tv); 2047 if(timer->ev_timer->enabled) 2048 comm_timer_disable(timer); 2049 event_set(&timer->ev_timer->ev, -1, EV_TIMEOUT, 2050 comm_timer_callback, timer); 2051 if(event_base_set(timer->ev_timer->base->eb->base, 2052 &timer->ev_timer->ev) != 0) 2053 log_err("comm_timer_set: set_base failed."); 2054 if(evtimer_add(&timer->ev_timer->ev, tv) != 0) 2055 log_err("comm_timer_set: evtimer_add failed."); 2056 timer->ev_timer->enabled = 1; 2057} 2058 2059void 2060comm_timer_delete(struct comm_timer* timer) 2061{ 2062 if(!timer) 2063 return; 2064 comm_timer_disable(timer); 2065 free(timer->ev_timer); 2066 free(timer); 2067} 2068 2069void 2070comm_timer_callback(int ATTR_UNUSED(fd), short event, void* arg) 2071{ 2072 struct comm_timer* tm = (struct comm_timer*)arg; 2073 if(!(event&EV_TIMEOUT)) 2074 return; 2075 comm_base_now(tm->ev_timer->base); 2076 tm->ev_timer->enabled = 0; 2077 fptr_ok(fptr_whitelist_comm_timer(tm->callback)); 2078 (*tm->callback)(tm->cb_arg); 2079} 2080 2081int 2082comm_timer_is_set(struct comm_timer* timer) 2083{ 2084 return (int)timer->ev_timer->enabled; 2085} 2086 2087size_t 2088comm_timer_get_mem(struct comm_timer* timer) 2089{ 2090 return sizeof(*timer) + sizeof(struct internal_timer); 2091} 2092 2093struct comm_signal* 2094comm_signal_create(struct comm_base* base, 2095 void (*callback)(int, void*), void* cb_arg) 2096{ 2097 struct comm_signal* com = (struct comm_signal*)malloc( 2098 sizeof(struct comm_signal)); 2099 if(!com) { 2100 log_err("malloc failed"); 2101 return NULL; 2102 } 2103 com->base = base; 2104 com->callback = callback; 2105 com->cb_arg = cb_arg; 2106 com->ev_signal = NULL; 2107 return com; 2108} 2109 2110void 2111comm_signal_callback(int sig, short event, void* arg) 2112{ 2113 struct comm_signal* comsig = (struct comm_signal*)arg; 2114 if(!(event & EV_SIGNAL)) 2115 return; 2116 comm_base_now(comsig->base); 2117 fptr_ok(fptr_whitelist_comm_signal(comsig->callback)); 2118 (*comsig->callback)(sig, comsig->cb_arg); 2119} 2120 2121int 2122comm_signal_bind(struct comm_signal* comsig, int sig) 2123{ 2124 struct internal_signal* entry = (struct internal_signal*)calloc(1, 2125 sizeof(struct internal_signal)); 2126 if(!entry) { 2127 log_err("malloc failed"); 2128 return 0; 2129 } 2130 log_assert(comsig); 2131 /* add signal event */ 2132 signal_set(&entry->ev, sig, comm_signal_callback, comsig); 2133 if(event_base_set(comsig->base->eb->base, &entry->ev) != 0) { 2134 log_err("Could not set signal base"); 2135 free(entry); 2136 return 0; 2137 } 2138 if(signal_add(&entry->ev, NULL) != 0) { 2139 log_err("Could not add signal handler"); 2140 free(entry); 2141 return 0; 2142 } 2143 /* link into list */ 2144 entry->next = comsig->ev_signal; 2145 comsig->ev_signal = entry; 2146 return 1; 2147} 2148 2149void 2150comm_signal_delete(struct comm_signal* comsig) 2151{ 2152 struct internal_signal* p, *np; 2153 if(!comsig) 2154 return; 2155 p=comsig->ev_signal; 2156 while(p) { 2157 np = p->next; 2158 signal_del(&p->ev); 2159 free(p); 2160 p = np; 2161 } 2162 free(comsig); 2163} 2164