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 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 contains event notification functions. 40 */ 41 #include "config.h" 42 #include "util/netevent.h" 43 #include "util/ub_event.h" 44 #include "util/log.h" 45 #include "util/net_help.h" 46 #include "util/tcp_conn_limit.h" 47 #include "util/fptr_wlist.h" 48 #include "sldns/pkthdr.h" 49 #include "sldns/sbuffer.h" 50 #include "sldns/str2wire.h" 51 #include "dnstap/dnstap.h" 52 #include "dnscrypt/dnscrypt.h" 53 #include "services/listen_dnsport.h" 54 #ifdef HAVE_OPENSSL_SSL_H 55 #include <openssl/ssl.h> 56 #endif 57 #ifdef HAVE_OPENSSL_ERR_H 58 #include <openssl/err.h> 59 #endif 60 61 /* -------- Start of local definitions -------- */ 62 /** if CMSG_ALIGN is not defined on this platform, a workaround */ 63 #ifndef CMSG_ALIGN 64 # ifdef __CMSG_ALIGN 65 # define CMSG_ALIGN(n) __CMSG_ALIGN(n) 66 # elif defined(CMSG_DATA_ALIGN) 67 # define CMSG_ALIGN _CMSG_DATA_ALIGN 68 # else 69 # define CMSG_ALIGN(len) (((len)+sizeof(long)-1) & ~(sizeof(long)-1)) 70 # endif 71 #endif 72 73 /** if CMSG_LEN is not defined on this platform, a workaround */ 74 #ifndef CMSG_LEN 75 # define CMSG_LEN(len) (CMSG_ALIGN(sizeof(struct cmsghdr))+(len)) 76 #endif 77 78 /** if CMSG_SPACE is not defined on this platform, a workaround */ 79 #ifndef CMSG_SPACE 80 # ifdef _CMSG_HDR_ALIGN 81 # define CMSG_SPACE(l) (CMSG_ALIGN(l)+_CMSG_HDR_ALIGN(sizeof(struct cmsghdr))) 82 # else 83 # define CMSG_SPACE(l) (CMSG_ALIGN(l)+CMSG_ALIGN(sizeof(struct cmsghdr))) 84 # endif 85 #endif 86 87 /** The TCP writing query timeout in milliseconds */ 88 #define TCP_QUERY_TIMEOUT 120000 89 /** The minimum actual TCP timeout to use, regardless of what we advertise, 90 * in msec */ 91 #define TCP_QUERY_TIMEOUT_MINIMUM 200 92 93 #ifndef NONBLOCKING_IS_BROKEN 94 /** number of UDP reads to perform per read indication from select */ 95 #define NUM_UDP_PER_SELECT 100 96 #else 97 #define NUM_UDP_PER_SELECT 1 98 #endif 99 100 /** 101 * The internal event structure for keeping ub_event info for the event. 102 * Possibly other structures (list, tree) this is part of. 103 */ 104 struct internal_event { 105 /** the comm base */ 106 struct comm_base* base; 107 /** ub_event event type */ 108 struct ub_event* ev; 109 }; 110 111 /** 112 * Internal base structure, so that every thread has its own events. 113 */ 114 struct internal_base { 115 /** ub_event event_base type. */ 116 struct ub_event_base* base; 117 /** seconds time pointer points here */ 118 time_t secs; 119 /** timeval with current time */ 120 struct timeval now; 121 /** the event used for slow_accept timeouts */ 122 struct ub_event* slow_accept; 123 /** true if slow_accept is enabled */ 124 int slow_accept_enabled; 125 }; 126 127 /** 128 * Internal timer structure, to store timer event in. 129 */ 130 struct internal_timer { 131 /** the super struct from which derived */ 132 struct comm_timer super; 133 /** the comm base */ 134 struct comm_base* base; 135 /** ub_event event type */ 136 struct ub_event* ev; 137 /** is timer enabled */ 138 uint8_t enabled; 139 }; 140 141 /** 142 * Internal signal structure, to store signal event in. 143 */ 144 struct internal_signal { 145 /** ub_event event type */ 146 struct ub_event* ev; 147 /** next in signal list */ 148 struct internal_signal* next; 149 }; 150 151 /** create a tcp handler with a parent */ 152 static struct comm_point* comm_point_create_tcp_handler( 153 struct comm_base *base, struct comm_point* parent, size_t bufsize, 154 struct sldns_buffer* spoolbuf, comm_point_callback_type* callback, 155 void* callback_arg); 156 157 /* -------- End of local definitions -------- */ 158 159 struct comm_base* 160 comm_base_create(int sigs) 161 { 162 struct comm_base* b = (struct comm_base*)calloc(1, 163 sizeof(struct comm_base)); 164 const char *evnm="event", *evsys="", *evmethod=""; 165 166 if(!b) 167 return NULL; 168 b->eb = (struct internal_base*)calloc(1, sizeof(struct internal_base)); 169 if(!b->eb) { 170 free(b); 171 return NULL; 172 } 173 b->eb->base = ub_default_event_base(sigs, &b->eb->secs, &b->eb->now); 174 if(!b->eb->base) { 175 free(b->eb); 176 free(b); 177 return NULL; 178 } 179 ub_comm_base_now(b); 180 ub_get_event_sys(b->eb->base, &evnm, &evsys, &evmethod); 181 verbose(VERB_ALGO, "%s %s uses %s method.", evnm, evsys, evmethod); 182 return b; 183 } 184 185 struct comm_base* 186 comm_base_create_event(struct ub_event_base* base) 187 { 188 struct comm_base* b = (struct comm_base*)calloc(1, 189 sizeof(struct comm_base)); 190 if(!b) 191 return NULL; 192 b->eb = (struct internal_base*)calloc(1, sizeof(struct internal_base)); 193 if(!b->eb) { 194 free(b); 195 return NULL; 196 } 197 b->eb->base = base; 198 ub_comm_base_now(b); 199 return b; 200 } 201 202 void 203 comm_base_delete(struct comm_base* b) 204 { 205 if(!b) 206 return; 207 if(b->eb->slow_accept_enabled) { 208 if(ub_event_del(b->eb->slow_accept) != 0) { 209 log_err("could not event_del slow_accept"); 210 } 211 ub_event_free(b->eb->slow_accept); 212 } 213 ub_event_base_free(b->eb->base); 214 b->eb->base = NULL; 215 free(b->eb); 216 free(b); 217 } 218 219 void 220 comm_base_delete_no_base(struct comm_base* b) 221 { 222 if(!b) 223 return; 224 if(b->eb->slow_accept_enabled) { 225 if(ub_event_del(b->eb->slow_accept) != 0) { 226 log_err("could not event_del slow_accept"); 227 } 228 ub_event_free(b->eb->slow_accept); 229 } 230 b->eb->base = NULL; 231 free(b->eb); 232 free(b); 233 } 234 235 void 236 comm_base_timept(struct comm_base* b, time_t** tt, struct timeval** tv) 237 { 238 *tt = &b->eb->secs; 239 *tv = &b->eb->now; 240 } 241 242 void 243 comm_base_dispatch(struct comm_base* b) 244 { 245 int retval; 246 retval = ub_event_base_dispatch(b->eb->base); 247 if(retval < 0) { 248 fatal_exit("event_dispatch returned error %d, " 249 "errno is %s", retval, strerror(errno)); 250 } 251 } 252 253 void comm_base_exit(struct comm_base* b) 254 { 255 if(ub_event_base_loopexit(b->eb->base) != 0) { 256 log_err("Could not loopexit"); 257 } 258 } 259 260 void comm_base_set_slow_accept_handlers(struct comm_base* b, 261 void (*stop_acc)(void*), void (*start_acc)(void*), void* arg) 262 { 263 b->stop_accept = stop_acc; 264 b->start_accept = start_acc; 265 b->cb_arg = arg; 266 } 267 268 struct ub_event_base* comm_base_internal(struct comm_base* b) 269 { 270 return b->eb->base; 271 } 272 273 /** see if errno for udp has to be logged or not uses globals */ 274 static int 275 udp_send_errno_needs_log(struct sockaddr* addr, socklen_t addrlen) 276 { 277 /* do not log transient errors (unless high verbosity) */ 278 #if defined(ENETUNREACH) || defined(EHOSTDOWN) || defined(EHOSTUNREACH) || defined(ENETDOWN) 279 switch(errno) { 280 # ifdef ENETUNREACH 281 case ENETUNREACH: 282 # endif 283 # ifdef EHOSTDOWN 284 case EHOSTDOWN: 285 # endif 286 # ifdef EHOSTUNREACH 287 case EHOSTUNREACH: 288 # endif 289 # ifdef ENETDOWN 290 case ENETDOWN: 291 # endif 292 if(verbosity < VERB_ALGO) 293 return 0; 294 default: 295 break; 296 } 297 #endif 298 /* permission denied is gotten for every send if the 299 * network is disconnected (on some OS), squelch it */ 300 if( ((errno == EPERM) 301 # ifdef EADDRNOTAVAIL 302 /* 'Cannot assign requested address' also when disconnected */ 303 || (errno == EADDRNOTAVAIL) 304 # endif 305 ) && verbosity < VERB_DETAIL) 306 return 0; 307 # ifdef EADDRINUSE 308 /* If SO_REUSEADDR is set, we could try to connect to the same server 309 * from the same source port twice. */ 310 if(errno == EADDRINUSE && verbosity < VERB_DETAIL) 311 return 0; 312 # endif 313 /* squelch errors where people deploy AAAA ::ffff:bla for 314 * authority servers, which we try for intranets. */ 315 if(errno == EINVAL && addr_is_ip4mapped( 316 (struct sockaddr_storage*)addr, addrlen) && 317 verbosity < VERB_DETAIL) 318 return 0; 319 /* SO_BROADCAST sockopt can give access to 255.255.255.255, 320 * but a dns cache does not need it. */ 321 if(errno == EACCES && addr_is_broadcast( 322 (struct sockaddr_storage*)addr, addrlen) && 323 verbosity < VERB_DETAIL) 324 return 0; 325 return 1; 326 } 327 328 int tcp_connect_errno_needs_log(struct sockaddr* addr, socklen_t addrlen) 329 { 330 return udp_send_errno_needs_log(addr, addrlen); 331 } 332 333 /* send a UDP reply */ 334 int 335 comm_point_send_udp_msg(struct comm_point *c, sldns_buffer* packet, 336 struct sockaddr* addr, socklen_t addrlen) 337 { 338 ssize_t sent; 339 log_assert(c->fd != -1); 340 #ifdef UNBOUND_DEBUG 341 if(sldns_buffer_remaining(packet) == 0) 342 log_err("error: send empty UDP packet"); 343 #endif 344 log_assert(addr && addrlen > 0); 345 sent = sendto(c->fd, (void*)sldns_buffer_begin(packet), 346 sldns_buffer_remaining(packet), 0, 347 addr, addrlen); 348 if(sent == -1) { 349 /* try again and block, waiting for IO to complete, 350 * we want to send the answer, and we will wait for 351 * the ethernet interface buffer to have space. */ 352 #ifndef USE_WINSOCK 353 if(errno == EAGAIN || 354 # ifdef EWOULDBLOCK 355 errno == EWOULDBLOCK || 356 # endif 357 errno == ENOBUFS) { 358 #else 359 if(WSAGetLastError() == WSAEINPROGRESS || 360 WSAGetLastError() == WSAENOBUFS || 361 WSAGetLastError() == WSAEWOULDBLOCK) { 362 #endif 363 int e; 364 fd_set_block(c->fd); 365 sent = sendto(c->fd, (void*)sldns_buffer_begin(packet), 366 sldns_buffer_remaining(packet), 0, 367 addr, addrlen); 368 e = errno; 369 fd_set_nonblock(c->fd); 370 errno = e; 371 } 372 } 373 if(sent == -1) { 374 if(!udp_send_errno_needs_log(addr, addrlen)) 375 return 0; 376 #ifndef USE_WINSOCK 377 verbose(VERB_OPS, "sendto failed: %s", strerror(errno)); 378 #else 379 verbose(VERB_OPS, "sendto failed: %s", 380 wsa_strerror(WSAGetLastError())); 381 #endif 382 log_addr(VERB_OPS, "remote address is", 383 (struct sockaddr_storage*)addr, addrlen); 384 return 0; 385 } else if((size_t)sent != sldns_buffer_remaining(packet)) { 386 log_err("sent %d in place of %d bytes", 387 (int)sent, (int)sldns_buffer_remaining(packet)); 388 return 0; 389 } 390 return 1; 391 } 392 393 #if defined(AF_INET6) && defined(IPV6_PKTINFO) && (defined(HAVE_RECVMSG) || defined(HAVE_SENDMSG)) 394 /** print debug ancillary info */ 395 static void p_ancil(const char* str, struct comm_reply* r) 396 { 397 if(r->srctype != 4 && r->srctype != 6) { 398 log_info("%s: unknown srctype %d", str, r->srctype); 399 return; 400 } 401 if(r->srctype == 6) { 402 char buf[1024]; 403 if(inet_ntop(AF_INET6, &r->pktinfo.v6info.ipi6_addr, 404 buf, (socklen_t)sizeof(buf)) == 0) { 405 (void)strlcpy(buf, "(inet_ntop error)", sizeof(buf)); 406 } 407 buf[sizeof(buf)-1]=0; 408 log_info("%s: %s %d", str, buf, r->pktinfo.v6info.ipi6_ifindex); 409 } else if(r->srctype == 4) { 410 #ifdef IP_PKTINFO 411 char buf1[1024], buf2[1024]; 412 if(inet_ntop(AF_INET, &r->pktinfo.v4info.ipi_addr, 413 buf1, (socklen_t)sizeof(buf1)) == 0) { 414 (void)strlcpy(buf1, "(inet_ntop error)", sizeof(buf1)); 415 } 416 buf1[sizeof(buf1)-1]=0; 417 #ifdef HAVE_STRUCT_IN_PKTINFO_IPI_SPEC_DST 418 if(inet_ntop(AF_INET, &r->pktinfo.v4info.ipi_spec_dst, 419 buf2, (socklen_t)sizeof(buf2)) == 0) { 420 (void)strlcpy(buf2, "(inet_ntop error)", sizeof(buf2)); 421 } 422 buf2[sizeof(buf2)-1]=0; 423 #else 424 buf2[0]=0; 425 #endif 426 log_info("%s: %d %s %s", str, r->pktinfo.v4info.ipi_ifindex, 427 buf1, buf2); 428 #elif defined(IP_RECVDSTADDR) 429 char buf1[1024]; 430 if(inet_ntop(AF_INET, &r->pktinfo.v4addr, 431 buf1, (socklen_t)sizeof(buf1)) == 0) { 432 (void)strlcpy(buf1, "(inet_ntop error)", sizeof(buf1)); 433 } 434 buf1[sizeof(buf1)-1]=0; 435 log_info("%s: %s", str, buf1); 436 #endif /* IP_PKTINFO or PI_RECVDSTDADDR */ 437 } 438 } 439 #endif /* AF_INET6 && IPV6_PKTINFO && HAVE_RECVMSG||HAVE_SENDMSG */ 440 441 /** send a UDP reply over specified interface*/ 442 static int 443 comm_point_send_udp_msg_if(struct comm_point *c, sldns_buffer* packet, 444 struct sockaddr* addr, socklen_t addrlen, struct comm_reply* r) 445 { 446 #if defined(AF_INET6) && defined(IPV6_PKTINFO) && defined(HAVE_SENDMSG) 447 ssize_t sent; 448 struct msghdr msg; 449 struct iovec iov[1]; 450 char control[256]; 451 #ifndef S_SPLINT_S 452 struct cmsghdr *cmsg; 453 #endif /* S_SPLINT_S */ 454 455 log_assert(c->fd != -1); 456 #ifdef UNBOUND_DEBUG 457 if(sldns_buffer_remaining(packet) == 0) 458 log_err("error: send empty UDP packet"); 459 #endif 460 log_assert(addr && addrlen > 0); 461 462 msg.msg_name = addr; 463 msg.msg_namelen = addrlen; 464 iov[0].iov_base = sldns_buffer_begin(packet); 465 iov[0].iov_len = sldns_buffer_remaining(packet); 466 msg.msg_iov = iov; 467 msg.msg_iovlen = 1; 468 msg.msg_control = control; 469 #ifndef S_SPLINT_S 470 msg.msg_controllen = sizeof(control); 471 #endif /* S_SPLINT_S */ 472 msg.msg_flags = 0; 473 474 #ifndef S_SPLINT_S 475 cmsg = CMSG_FIRSTHDR(&msg); 476 if(r->srctype == 4) { 477 #ifdef IP_PKTINFO 478 void* cmsg_data; 479 msg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo)); 480 log_assert(msg.msg_controllen <= sizeof(control)); 481 cmsg->cmsg_level = IPPROTO_IP; 482 cmsg->cmsg_type = IP_PKTINFO; 483 memmove(CMSG_DATA(cmsg), &r->pktinfo.v4info, 484 sizeof(struct in_pktinfo)); 485 /* unset the ifindex to not bypass the routing tables */ 486 cmsg_data = CMSG_DATA(cmsg); 487 ((struct in_pktinfo *) cmsg_data)->ipi_ifindex = 0; 488 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); 489 #elif defined(IP_SENDSRCADDR) 490 msg.msg_controllen = CMSG_SPACE(sizeof(struct in_addr)); 491 log_assert(msg.msg_controllen <= sizeof(control)); 492 cmsg->cmsg_level = IPPROTO_IP; 493 cmsg->cmsg_type = IP_SENDSRCADDR; 494 memmove(CMSG_DATA(cmsg), &r->pktinfo.v4addr, 495 sizeof(struct in_addr)); 496 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr)); 497 #else 498 verbose(VERB_ALGO, "no IP_PKTINFO or IP_SENDSRCADDR"); 499 msg.msg_control = NULL; 500 #endif /* IP_PKTINFO or IP_SENDSRCADDR */ 501 } else if(r->srctype == 6) { 502 void* cmsg_data; 503 msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 504 log_assert(msg.msg_controllen <= sizeof(control)); 505 cmsg->cmsg_level = IPPROTO_IPV6; 506 cmsg->cmsg_type = IPV6_PKTINFO; 507 memmove(CMSG_DATA(cmsg), &r->pktinfo.v6info, 508 sizeof(struct in6_pktinfo)); 509 /* unset the ifindex to not bypass the routing tables */ 510 cmsg_data = CMSG_DATA(cmsg); 511 ((struct in6_pktinfo *) cmsg_data)->ipi6_ifindex = 0; 512 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 513 } else { 514 /* try to pass all 0 to use default route */ 515 msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo)); 516 log_assert(msg.msg_controllen <= sizeof(control)); 517 cmsg->cmsg_level = IPPROTO_IPV6; 518 cmsg->cmsg_type = IPV6_PKTINFO; 519 memset(CMSG_DATA(cmsg), 0, sizeof(struct in6_pktinfo)); 520 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 521 } 522 #endif /* S_SPLINT_S */ 523 if(verbosity >= VERB_ALGO) 524 p_ancil("send_udp over interface", r); 525 sent = sendmsg(c->fd, &msg, 0); 526 if(sent == -1) { 527 /* try again and block, waiting for IO to complete, 528 * we want to send the answer, and we will wait for 529 * the ethernet interface buffer to have space. */ 530 #ifndef USE_WINSOCK 531 if(errno == EAGAIN || 532 # ifdef EWOULDBLOCK 533 errno == EWOULDBLOCK || 534 # endif 535 errno == ENOBUFS) { 536 #else 537 if(WSAGetLastError() == WSAEINPROGRESS || 538 WSAGetLastError() == WSAENOBUFS || 539 WSAGetLastError() == WSAEWOULDBLOCK) { 540 #endif 541 int e; 542 fd_set_block(c->fd); 543 sent = sendmsg(c->fd, &msg, 0); 544 e = errno; 545 fd_set_nonblock(c->fd); 546 errno = e; 547 } 548 } 549 if(sent == -1) { 550 if(!udp_send_errno_needs_log(addr, addrlen)) 551 return 0; 552 verbose(VERB_OPS, "sendmsg failed: %s", strerror(errno)); 553 log_addr(VERB_OPS, "remote address is", 554 (struct sockaddr_storage*)addr, addrlen); 555 #ifdef __NetBSD__ 556 /* netbsd 7 has IP_PKTINFO for recv but not send */ 557 if(errno == EINVAL && r->srctype == 4) 558 log_err("sendmsg: No support for sendmsg(IP_PKTINFO). " 559 "Please disable interface-automatic"); 560 #endif 561 return 0; 562 } else if((size_t)sent != sldns_buffer_remaining(packet)) { 563 log_err("sent %d in place of %d bytes", 564 (int)sent, (int)sldns_buffer_remaining(packet)); 565 return 0; 566 } 567 return 1; 568 #else 569 (void)c; 570 (void)packet; 571 (void)addr; 572 (void)addrlen; 573 (void)r; 574 log_err("sendmsg: IPV6_PKTINFO not supported"); 575 return 0; 576 #endif /* AF_INET6 && IPV6_PKTINFO && HAVE_SENDMSG */ 577 } 578 579 void 580 comm_point_udp_ancil_callback(int fd, short event, void* arg) 581 { 582 #if defined(AF_INET6) && defined(IPV6_PKTINFO) && defined(HAVE_RECVMSG) 583 struct comm_reply rep; 584 struct msghdr msg; 585 struct iovec iov[1]; 586 ssize_t rcv; 587 char ancil[256]; 588 int i; 589 #ifndef S_SPLINT_S 590 struct cmsghdr* cmsg; 591 #endif /* S_SPLINT_S */ 592 593 rep.c = (struct comm_point*)arg; 594 log_assert(rep.c->type == comm_udp); 595 596 if(!(event&UB_EV_READ)) 597 return; 598 log_assert(rep.c && rep.c->buffer && rep.c->fd == fd); 599 ub_comm_base_now(rep.c->ev->base); 600 for(i=0; i<NUM_UDP_PER_SELECT; i++) { 601 sldns_buffer_clear(rep.c->buffer); 602 rep.addrlen = (socklen_t)sizeof(rep.addr); 603 log_assert(fd != -1); 604 log_assert(sldns_buffer_remaining(rep.c->buffer) > 0); 605 msg.msg_name = &rep.addr; 606 msg.msg_namelen = (socklen_t)sizeof(rep.addr); 607 iov[0].iov_base = sldns_buffer_begin(rep.c->buffer); 608 iov[0].iov_len = sldns_buffer_remaining(rep.c->buffer); 609 msg.msg_iov = iov; 610 msg.msg_iovlen = 1; 611 msg.msg_control = ancil; 612 #ifndef S_SPLINT_S 613 msg.msg_controllen = sizeof(ancil); 614 #endif /* S_SPLINT_S */ 615 msg.msg_flags = 0; 616 rcv = recvmsg(fd, &msg, 0); 617 if(rcv == -1) { 618 if(errno != EAGAIN && errno != EINTR) { 619 log_err("recvmsg failed: %s", strerror(errno)); 620 } 621 return; 622 } 623 rep.addrlen = msg.msg_namelen; 624 sldns_buffer_skip(rep.c->buffer, rcv); 625 sldns_buffer_flip(rep.c->buffer); 626 rep.srctype = 0; 627 #ifndef S_SPLINT_S 628 for(cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; 629 cmsg = CMSG_NXTHDR(&msg, cmsg)) { 630 if( cmsg->cmsg_level == IPPROTO_IPV6 && 631 cmsg->cmsg_type == IPV6_PKTINFO) { 632 rep.srctype = 6; 633 memmove(&rep.pktinfo.v6info, CMSG_DATA(cmsg), 634 sizeof(struct in6_pktinfo)); 635 break; 636 #ifdef IP_PKTINFO 637 } else if( cmsg->cmsg_level == IPPROTO_IP && 638 cmsg->cmsg_type == IP_PKTINFO) { 639 rep.srctype = 4; 640 memmove(&rep.pktinfo.v4info, CMSG_DATA(cmsg), 641 sizeof(struct in_pktinfo)); 642 break; 643 #elif defined(IP_RECVDSTADDR) 644 } else if( cmsg->cmsg_level == IPPROTO_IP && 645 cmsg->cmsg_type == IP_RECVDSTADDR) { 646 rep.srctype = 4; 647 memmove(&rep.pktinfo.v4addr, CMSG_DATA(cmsg), 648 sizeof(struct in_addr)); 649 break; 650 #endif /* IP_PKTINFO or IP_RECVDSTADDR */ 651 } 652 } 653 if(verbosity >= VERB_ALGO) 654 p_ancil("receive_udp on interface", &rep); 655 #endif /* S_SPLINT_S */ 656 fptr_ok(fptr_whitelist_comm_point(rep.c->callback)); 657 if((*rep.c->callback)(rep.c, rep.c->cb_arg, NETEVENT_NOERROR, &rep)) { 658 /* send back immediate reply */ 659 (void)comm_point_send_udp_msg_if(rep.c, rep.c->buffer, 660 (struct sockaddr*)&rep.addr, rep.addrlen, &rep); 661 } 662 if(!rep.c || rep.c->fd == -1) /* commpoint closed */ 663 break; 664 } 665 #else 666 (void)fd; 667 (void)event; 668 (void)arg; 669 fatal_exit("recvmsg: No support for IPV6_PKTINFO; IP_PKTINFO or IP_RECVDSTADDR. " 670 "Please disable interface-automatic"); 671 #endif /* AF_INET6 && IPV6_PKTINFO && HAVE_RECVMSG */ 672 } 673 674 void 675 comm_point_udp_callback(int fd, short event, void* arg) 676 { 677 struct comm_reply rep; 678 ssize_t rcv; 679 int i; 680 struct sldns_buffer *buffer; 681 682 rep.c = (struct comm_point*)arg; 683 log_assert(rep.c->type == comm_udp); 684 685 if(!(event&UB_EV_READ)) 686 return; 687 log_assert(rep.c && rep.c->buffer && rep.c->fd == fd); 688 ub_comm_base_now(rep.c->ev->base); 689 for(i=0; i<NUM_UDP_PER_SELECT; i++) { 690 sldns_buffer_clear(rep.c->buffer); 691 rep.addrlen = (socklen_t)sizeof(rep.addr); 692 log_assert(fd != -1); 693 log_assert(sldns_buffer_remaining(rep.c->buffer) > 0); 694 rcv = recvfrom(fd, (void*)sldns_buffer_begin(rep.c->buffer), 695 sldns_buffer_remaining(rep.c->buffer), 0, 696 (struct sockaddr*)&rep.addr, &rep.addrlen); 697 if(rcv == -1) { 698 #ifndef USE_WINSOCK 699 if(errno != EAGAIN && errno != EINTR) 700 log_err("recvfrom %d failed: %s", 701 fd, strerror(errno)); 702 #else 703 if(WSAGetLastError() != WSAEINPROGRESS && 704 WSAGetLastError() != WSAECONNRESET && 705 WSAGetLastError()!= WSAEWOULDBLOCK) 706 log_err("recvfrom failed: %s", 707 wsa_strerror(WSAGetLastError())); 708 #endif 709 return; 710 } 711 sldns_buffer_skip(rep.c->buffer, rcv); 712 sldns_buffer_flip(rep.c->buffer); 713 rep.srctype = 0; 714 fptr_ok(fptr_whitelist_comm_point(rep.c->callback)); 715 if((*rep.c->callback)(rep.c, rep.c->cb_arg, NETEVENT_NOERROR, &rep)) { 716 /* send back immediate reply */ 717 #ifdef USE_DNSCRYPT 718 buffer = rep.c->dnscrypt_buffer; 719 #else 720 buffer = rep.c->buffer; 721 #endif 722 (void)comm_point_send_udp_msg(rep.c, buffer, 723 (struct sockaddr*)&rep.addr, rep.addrlen); 724 } 725 if(!rep.c || rep.c->fd != fd) /* commpoint closed to -1 or reused for 726 another UDP port. Note rep.c cannot be reused with TCP fd. */ 727 break; 728 } 729 } 730 731 /** Use a new tcp handler for new query fd, set to read query */ 732 static void 733 setup_tcp_handler(struct comm_point* c, int fd, int cur, int max) 734 { 735 int handler_usage; 736 log_assert(c->type == comm_tcp); 737 log_assert(c->fd == -1); 738 sldns_buffer_clear(c->buffer); 739 #ifdef USE_DNSCRYPT 740 if (c->dnscrypt) 741 sldns_buffer_clear(c->dnscrypt_buffer); 742 #endif 743 c->tcp_is_reading = 1; 744 c->tcp_byte_count = 0; 745 /* if more than half the tcp handlers are in use, use a shorter 746 * timeout for this TCP connection, we need to make space for 747 * other connections to be able to get attention */ 748 /* If > 50% TCP handler structures in use, set timeout to 1/100th 749 * configured value. 750 * If > 65%TCP handler structures in use, set to 1/500th configured 751 * value. 752 * If > 80% TCP handler structures in use, set to 0. 753 * 754 * If the timeout to use falls below 200 milliseconds, an actual 755 * timeout of 200ms is used. 756 */ 757 handler_usage = (cur * 100) / max; 758 if(handler_usage > 50 && handler_usage <= 65) 759 c->tcp_timeout_msec /= 100; 760 else if (handler_usage > 65 && handler_usage <= 80) 761 c->tcp_timeout_msec /= 500; 762 else if (handler_usage > 80) 763 c->tcp_timeout_msec = 0; 764 comm_point_start_listening(c, fd, 765 c->tcp_timeout_msec < TCP_QUERY_TIMEOUT_MINIMUM 766 ? TCP_QUERY_TIMEOUT_MINIMUM 767 : c->tcp_timeout_msec); 768 } 769 770 void comm_base_handle_slow_accept(int ATTR_UNUSED(fd), 771 short ATTR_UNUSED(event), void* arg) 772 { 773 struct comm_base* b = (struct comm_base*)arg; 774 /* timeout for the slow accept, re-enable accepts again */ 775 if(b->start_accept) { 776 verbose(VERB_ALGO, "wait is over, slow accept disabled"); 777 fptr_ok(fptr_whitelist_start_accept(b->start_accept)); 778 (*b->start_accept)(b->cb_arg); 779 b->eb->slow_accept_enabled = 0; 780 } 781 } 782 783 int comm_point_perform_accept(struct comm_point* c, 784 struct sockaddr_storage* addr, socklen_t* addrlen) 785 { 786 int new_fd; 787 *addrlen = (socklen_t)sizeof(*addr); 788 #ifndef HAVE_ACCEPT4 789 new_fd = accept(c->fd, (struct sockaddr*)addr, addrlen); 790 #else 791 /* SOCK_NONBLOCK saves extra calls to fcntl for the same result */ 792 new_fd = accept4(c->fd, (struct sockaddr*)addr, addrlen, SOCK_NONBLOCK); 793 #endif 794 if(new_fd == -1) { 795 #ifndef USE_WINSOCK 796 /* EINTR is signal interrupt. others are closed connection. */ 797 if( errno == EINTR || errno == EAGAIN 798 #ifdef EWOULDBLOCK 799 || errno == EWOULDBLOCK 800 #endif 801 #ifdef ECONNABORTED 802 || errno == ECONNABORTED 803 #endif 804 #ifdef EPROTO 805 || errno == EPROTO 806 #endif /* EPROTO */ 807 ) 808 return -1; 809 #if defined(ENFILE) && defined(EMFILE) 810 if(errno == ENFILE || errno == EMFILE) { 811 /* out of file descriptors, likely outside of our 812 * control. stop accept() calls for some time */ 813 if(c->ev->base->stop_accept) { 814 struct comm_base* b = c->ev->base; 815 struct timeval tv; 816 verbose(VERB_ALGO, "out of file descriptors: " 817 "slow accept"); 818 b->eb->slow_accept_enabled = 1; 819 fptr_ok(fptr_whitelist_stop_accept( 820 b->stop_accept)); 821 (*b->stop_accept)(b->cb_arg); 822 /* set timeout, no mallocs */ 823 tv.tv_sec = NETEVENT_SLOW_ACCEPT_TIME/1000; 824 tv.tv_usec = (NETEVENT_SLOW_ACCEPT_TIME%1000)*1000; 825 b->eb->slow_accept = ub_event_new(b->eb->base, 826 -1, UB_EV_TIMEOUT, 827 comm_base_handle_slow_accept, b); 828 if(b->eb->slow_accept == NULL) { 829 /* we do not want to log here, because 830 * that would spam the logfiles. 831 * error: "event_base_set failed." */ 832 } 833 else if(ub_event_add(b->eb->slow_accept, &tv) 834 != 0) { 835 /* we do not want to log here, 836 * error: "event_add failed." */ 837 } 838 } 839 return -1; 840 } 841 #endif 842 log_err_addr("accept failed", strerror(errno), addr, *addrlen); 843 #else /* USE_WINSOCK */ 844 if(WSAGetLastError() == WSAEINPROGRESS || 845 WSAGetLastError() == WSAECONNRESET) 846 return -1; 847 if(WSAGetLastError() == WSAEWOULDBLOCK) { 848 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_READ); 849 return -1; 850 } 851 log_err_addr("accept failed", wsa_strerror(WSAGetLastError()), 852 addr, *addrlen); 853 #endif 854 return -1; 855 } 856 if(c->tcp_conn_limit && c->type == comm_tcp_accept) { 857 c->tcl_addr = tcl_addr_lookup(c->tcp_conn_limit, addr, *addrlen); 858 if(!tcl_new_connection(c->tcl_addr)) { 859 if(verbosity >= 3) 860 log_err_addr("accept rejected", 861 "connection limit exceeded", addr, *addrlen); 862 close(new_fd); 863 return -1; 864 } 865 } 866 #ifndef HAVE_ACCEPT4 867 fd_set_nonblock(new_fd); 868 #endif 869 return new_fd; 870 } 871 872 #ifdef USE_WINSOCK 873 static long win_bio_cb(BIO *b, int oper, const char* ATTR_UNUSED(argp), 874 int ATTR_UNUSED(argi), long argl, long retvalue) 875 { 876 int wsa_err = WSAGetLastError(); /* store errcode before it is gone */ 877 verbose(VERB_ALGO, "bio_cb %d, %s %s %s", oper, 878 (oper&BIO_CB_RETURN)?"return":"before", 879 (oper&BIO_CB_READ)?"read":((oper&BIO_CB_WRITE)?"write":"other"), 880 wsa_err==WSAEWOULDBLOCK?"wsawb":""); 881 /* on windows, check if previous operation caused EWOULDBLOCK */ 882 if( (oper == (BIO_CB_READ|BIO_CB_RETURN) && argl == 0) || 883 (oper == (BIO_CB_GETS|BIO_CB_RETURN) && argl == 0)) { 884 if(wsa_err == WSAEWOULDBLOCK) 885 ub_winsock_tcp_wouldblock((struct ub_event*) 886 BIO_get_callback_arg(b), UB_EV_READ); 887 } 888 if( (oper == (BIO_CB_WRITE|BIO_CB_RETURN) && argl == 0) || 889 (oper == (BIO_CB_PUTS|BIO_CB_RETURN) && argl == 0)) { 890 if(wsa_err == WSAEWOULDBLOCK) 891 ub_winsock_tcp_wouldblock((struct ub_event*) 892 BIO_get_callback_arg(b), UB_EV_WRITE); 893 } 894 /* return original return value */ 895 return retvalue; 896 } 897 898 /** set win bio callbacks for nonblocking operations */ 899 void 900 comm_point_tcp_win_bio_cb(struct comm_point* c, void* thessl) 901 { 902 SSL* ssl = (SSL*)thessl; 903 /* set them both just in case, but usually they are the same BIO */ 904 BIO_set_callback(SSL_get_rbio(ssl), &win_bio_cb); 905 BIO_set_callback_arg(SSL_get_rbio(ssl), (char*)c->ev->ev); 906 BIO_set_callback(SSL_get_wbio(ssl), &win_bio_cb); 907 BIO_set_callback_arg(SSL_get_wbio(ssl), (char*)c->ev->ev); 908 } 909 #endif 910 911 void 912 comm_point_tcp_accept_callback(int fd, short event, void* arg) 913 { 914 struct comm_point* c = (struct comm_point*)arg, *c_hdl; 915 int new_fd; 916 log_assert(c->type == comm_tcp_accept); 917 if(!(event & UB_EV_READ)) { 918 log_info("ignoring tcp accept event %d", (int)event); 919 return; 920 } 921 ub_comm_base_now(c->ev->base); 922 /* find free tcp handler. */ 923 if(!c->tcp_free) { 924 log_warn("accepted too many tcp, connections full"); 925 return; 926 } 927 /* accept incoming connection. */ 928 c_hdl = c->tcp_free; 929 /* clear leftover flags from previous use, and then set the 930 * correct event base for the event structure for libevent */ 931 ub_event_free(c_hdl->ev->ev); 932 c_hdl->ev->ev = ub_event_new(c_hdl->ev->base->eb->base, -1, UB_EV_PERSIST | UB_EV_READ | UB_EV_TIMEOUT, comm_point_tcp_handle_callback, c_hdl); 933 if(!c_hdl->ev->ev) { 934 log_warn("could not ub_event_new, dropped tcp"); 935 return; 936 } 937 log_assert(fd != -1); 938 (void)fd; 939 new_fd = comm_point_perform_accept(c, &c_hdl->repinfo.addr, 940 &c_hdl->repinfo.addrlen); 941 if(new_fd == -1) 942 return; 943 if(c->ssl) { 944 c_hdl->ssl = incoming_ssl_fd(c->ssl, new_fd); 945 if(!c_hdl->ssl) { 946 c_hdl->fd = new_fd; 947 comm_point_close(c_hdl); 948 return; 949 } 950 c_hdl->ssl_shake_state = comm_ssl_shake_read; 951 #ifdef USE_WINSOCK 952 comm_point_tcp_win_bio_cb(c_hdl, c_hdl->ssl); 953 #endif 954 } 955 956 /* grab the tcp handler buffers */ 957 c->cur_tcp_count++; 958 c->tcp_free = c_hdl->tcp_free; 959 if(!c->tcp_free) { 960 /* stop accepting incoming queries for now. */ 961 comm_point_stop_listening(c); 962 } 963 setup_tcp_handler(c_hdl, new_fd, c->cur_tcp_count, c->max_tcp_count); 964 } 965 966 /** Make tcp handler free for next assignment */ 967 static void 968 reclaim_tcp_handler(struct comm_point* c) 969 { 970 log_assert(c->type == comm_tcp); 971 if(c->ssl) { 972 #ifdef HAVE_SSL 973 SSL_shutdown(c->ssl); 974 SSL_free(c->ssl); 975 c->ssl = NULL; 976 #endif 977 } 978 comm_point_close(c); 979 if(c->tcp_parent) { 980 c->tcp_parent->cur_tcp_count--; 981 c->tcp_free = c->tcp_parent->tcp_free; 982 c->tcp_parent->tcp_free = c; 983 if(!c->tcp_free) { 984 /* re-enable listening on accept socket */ 985 comm_point_start_listening(c->tcp_parent, -1, -1); 986 } 987 } 988 } 989 990 /** do the callback when writing is done */ 991 static void 992 tcp_callback_writer(struct comm_point* c) 993 { 994 log_assert(c->type == comm_tcp); 995 sldns_buffer_clear(c->buffer); 996 if(c->tcp_do_toggle_rw) 997 c->tcp_is_reading = 1; 998 c->tcp_byte_count = 0; 999 /* switch from listening(write) to listening(read) */ 1000 if(c->tcp_req_info) { 1001 tcp_req_info_handle_writedone(c->tcp_req_info); 1002 } else { 1003 comm_point_stop_listening(c); 1004 comm_point_start_listening(c, -1, -1); 1005 } 1006 } 1007 1008 /** do the callback when reading is done */ 1009 static void 1010 tcp_callback_reader(struct comm_point* c) 1011 { 1012 log_assert(c->type == comm_tcp || c->type == comm_local); 1013 sldns_buffer_flip(c->buffer); 1014 if(c->tcp_do_toggle_rw) 1015 c->tcp_is_reading = 0; 1016 c->tcp_byte_count = 0; 1017 if(c->tcp_req_info) { 1018 tcp_req_info_handle_readdone(c->tcp_req_info); 1019 } else { 1020 if(c->type == comm_tcp) 1021 comm_point_stop_listening(c); 1022 fptr_ok(fptr_whitelist_comm_point(c->callback)); 1023 if( (*c->callback)(c, c->cb_arg, NETEVENT_NOERROR, &c->repinfo) ) { 1024 comm_point_start_listening(c, -1, c->tcp_timeout_msec); 1025 } 1026 } 1027 } 1028 1029 #ifdef HAVE_SSL 1030 /** log certificate details */ 1031 static void 1032 log_cert(unsigned level, const char* str, X509* cert) 1033 { 1034 BIO* bio; 1035 char nul = 0; 1036 char* pp = NULL; 1037 long len; 1038 if(verbosity < level) return; 1039 bio = BIO_new(BIO_s_mem()); 1040 if(!bio) return; 1041 X509_print_ex(bio, cert, 0, (unsigned long)-1 1042 ^(X509_FLAG_NO_SUBJECT 1043 |X509_FLAG_NO_ISSUER|X509_FLAG_NO_VALIDITY 1044 |X509_FLAG_NO_EXTENSIONS|X509_FLAG_NO_AUX 1045 |X509_FLAG_NO_ATTRIBUTES)); 1046 BIO_write(bio, &nul, (int)sizeof(nul)); 1047 len = BIO_get_mem_data(bio, &pp); 1048 if(len != 0 && pp) { 1049 verbose(level, "%s: \n%s", str, pp); 1050 } 1051 BIO_free(bio); 1052 } 1053 #endif /* HAVE_SSL */ 1054 1055 /** continue ssl handshake */ 1056 #ifdef HAVE_SSL 1057 static int 1058 ssl_handshake(struct comm_point* c) 1059 { 1060 int r; 1061 if(c->ssl_shake_state == comm_ssl_shake_hs_read) { 1062 /* read condition satisfied back to writing */ 1063 comm_point_listen_for_rw(c, 1, 1); 1064 c->ssl_shake_state = comm_ssl_shake_none; 1065 return 1; 1066 } 1067 if(c->ssl_shake_state == comm_ssl_shake_hs_write) { 1068 /* write condition satisfied, back to reading */ 1069 comm_point_listen_for_rw(c, 1, 0); 1070 c->ssl_shake_state = comm_ssl_shake_none; 1071 return 1; 1072 } 1073 1074 ERR_clear_error(); 1075 r = SSL_do_handshake(c->ssl); 1076 if(r != 1) { 1077 int want = SSL_get_error(c->ssl, r); 1078 if(want == SSL_ERROR_WANT_READ) { 1079 if(c->ssl_shake_state == comm_ssl_shake_read) 1080 return 1; 1081 c->ssl_shake_state = comm_ssl_shake_read; 1082 comm_point_listen_for_rw(c, 1, 0); 1083 return 1; 1084 } else if(want == SSL_ERROR_WANT_WRITE) { 1085 if(c->ssl_shake_state == comm_ssl_shake_write) 1086 return 1; 1087 c->ssl_shake_state = comm_ssl_shake_write; 1088 comm_point_listen_for_rw(c, 0, 1); 1089 return 1; 1090 } else if(r == 0) { 1091 return 0; /* closed */ 1092 } else if(want == SSL_ERROR_SYSCALL) { 1093 /* SYSCALL and errno==0 means closed uncleanly */ 1094 if(errno != 0) 1095 log_err("SSL_handshake syscall: %s", 1096 strerror(errno)); 1097 return 0; 1098 } else { 1099 log_crypto_err("ssl handshake failed"); 1100 log_addr(1, "ssl handshake failed", &c->repinfo.addr, 1101 c->repinfo.addrlen); 1102 return 0; 1103 } 1104 } 1105 /* this is where peer verification could take place */ 1106 if((SSL_get_verify_mode(c->ssl)&SSL_VERIFY_PEER)) { 1107 /* verification */ 1108 if(SSL_get_verify_result(c->ssl) == X509_V_OK) { 1109 X509* x = SSL_get_peer_certificate(c->ssl); 1110 if(!x) { 1111 log_addr(VERB_ALGO, "SSL connection failed: " 1112 "no certificate", 1113 &c->repinfo.addr, c->repinfo.addrlen); 1114 return 0; 1115 } 1116 log_cert(VERB_ALGO, "peer certificate", x); 1117 #ifdef HAVE_SSL_GET0_PEERNAME 1118 if(SSL_get0_peername(c->ssl)) { 1119 char buf[255]; 1120 snprintf(buf, sizeof(buf), "SSL connection " 1121 "to %s authenticated", 1122 SSL_get0_peername(c->ssl)); 1123 log_addr(VERB_ALGO, buf, &c->repinfo.addr, 1124 c->repinfo.addrlen); 1125 } else { 1126 #endif 1127 log_addr(VERB_ALGO, "SSL connection " 1128 "authenticated", &c->repinfo.addr, 1129 c->repinfo.addrlen); 1130 #ifdef HAVE_SSL_GET0_PEERNAME 1131 } 1132 #endif 1133 X509_free(x); 1134 } else { 1135 X509* x = SSL_get_peer_certificate(c->ssl); 1136 if(x) { 1137 log_cert(VERB_ALGO, "peer certificate", x); 1138 X509_free(x); 1139 } 1140 log_addr(VERB_ALGO, "SSL connection failed: " 1141 "failed to authenticate", 1142 &c->repinfo.addr, c->repinfo.addrlen); 1143 return 0; 1144 } 1145 } else { 1146 /* unauthenticated, the verify peer flag was not set 1147 * in c->ssl when the ssl object was created from ssl_ctx */ 1148 log_addr(VERB_ALGO, "SSL connection", &c->repinfo.addr, 1149 c->repinfo.addrlen); 1150 } 1151 1152 /* setup listen rw correctly */ 1153 if(c->tcp_is_reading) { 1154 if(c->ssl_shake_state != comm_ssl_shake_read) 1155 comm_point_listen_for_rw(c, 1, 0); 1156 } else { 1157 comm_point_listen_for_rw(c, 1, 1); 1158 } 1159 c->ssl_shake_state = comm_ssl_shake_none; 1160 return 1; 1161 } 1162 #endif /* HAVE_SSL */ 1163 1164 /** ssl read callback on TCP */ 1165 static int 1166 ssl_handle_read(struct comm_point* c) 1167 { 1168 #ifdef HAVE_SSL 1169 int r; 1170 if(c->ssl_shake_state != comm_ssl_shake_none) { 1171 if(!ssl_handshake(c)) 1172 return 0; 1173 if(c->ssl_shake_state != comm_ssl_shake_none) 1174 return 1; 1175 } 1176 if(c->tcp_byte_count < sizeof(uint16_t)) { 1177 /* read length bytes */ 1178 ERR_clear_error(); 1179 if((r=SSL_read(c->ssl, (void*)sldns_buffer_at(c->buffer, 1180 c->tcp_byte_count), (int)(sizeof(uint16_t) - 1181 c->tcp_byte_count))) <= 0) { 1182 int want = SSL_get_error(c->ssl, r); 1183 if(want == SSL_ERROR_ZERO_RETURN) { 1184 if(c->tcp_req_info) 1185 return tcp_req_info_handle_read_close(c->tcp_req_info); 1186 return 0; /* shutdown, closed */ 1187 } else if(want == SSL_ERROR_WANT_READ) { 1188 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_READ); 1189 return 1; /* read more later */ 1190 } else if(want == SSL_ERROR_WANT_WRITE) { 1191 c->ssl_shake_state = comm_ssl_shake_hs_write; 1192 comm_point_listen_for_rw(c, 0, 1); 1193 return 1; 1194 } else if(want == SSL_ERROR_SYSCALL) { 1195 #ifdef ECONNRESET 1196 if(errno == ECONNRESET && verbosity < 2) 1197 return 0; /* silence reset by peer */ 1198 #endif 1199 if(errno != 0) 1200 log_err("SSL_read syscall: %s", 1201 strerror(errno)); 1202 return 0; 1203 } 1204 log_crypto_err("could not SSL_read"); 1205 return 0; 1206 } 1207 c->tcp_byte_count += r; 1208 if(c->tcp_byte_count < sizeof(uint16_t)) 1209 return 1; 1210 if(sldns_buffer_read_u16_at(c->buffer, 0) > 1211 sldns_buffer_capacity(c->buffer)) { 1212 verbose(VERB_QUERY, "ssl: dropped larger than buffer"); 1213 return 0; 1214 } 1215 sldns_buffer_set_limit(c->buffer, 1216 sldns_buffer_read_u16_at(c->buffer, 0)); 1217 if(sldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) { 1218 verbose(VERB_QUERY, "ssl: dropped bogus too short."); 1219 return 0; 1220 } 1221 sldns_buffer_skip(c->buffer, (ssize_t)(c->tcp_byte_count-sizeof(uint16_t))); 1222 verbose(VERB_ALGO, "Reading ssl tcp query of length %d", 1223 (int)sldns_buffer_limit(c->buffer)); 1224 } 1225 if(sldns_buffer_remaining(c->buffer) > 0) { 1226 ERR_clear_error(); 1227 r = SSL_read(c->ssl, (void*)sldns_buffer_current(c->buffer), 1228 (int)sldns_buffer_remaining(c->buffer)); 1229 if(r <= 0) { 1230 int want = SSL_get_error(c->ssl, r); 1231 if(want == SSL_ERROR_ZERO_RETURN) { 1232 if(c->tcp_req_info) 1233 return tcp_req_info_handle_read_close(c->tcp_req_info); 1234 return 0; /* shutdown, closed */ 1235 } else if(want == SSL_ERROR_WANT_READ) { 1236 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_READ); 1237 return 1; /* read more later */ 1238 } else if(want == SSL_ERROR_WANT_WRITE) { 1239 c->ssl_shake_state = comm_ssl_shake_hs_write; 1240 comm_point_listen_for_rw(c, 0, 1); 1241 return 1; 1242 } else if(want == SSL_ERROR_SYSCALL) { 1243 #ifdef ECONNRESET 1244 if(errno == ECONNRESET && verbosity < 2) 1245 return 0; /* silence reset by peer */ 1246 #endif 1247 if(errno != 0) 1248 log_err("SSL_read syscall: %s", 1249 strerror(errno)); 1250 return 0; 1251 } 1252 log_crypto_err("could not SSL_read"); 1253 return 0; 1254 } 1255 sldns_buffer_skip(c->buffer, (ssize_t)r); 1256 } 1257 if(sldns_buffer_remaining(c->buffer) <= 0) { 1258 tcp_callback_reader(c); 1259 } 1260 return 1; 1261 #else 1262 (void)c; 1263 return 0; 1264 #endif /* HAVE_SSL */ 1265 } 1266 1267 /** ssl write callback on TCP */ 1268 static int 1269 ssl_handle_write(struct comm_point* c) 1270 { 1271 #ifdef HAVE_SSL 1272 int r; 1273 if(c->ssl_shake_state != comm_ssl_shake_none) { 1274 if(!ssl_handshake(c)) 1275 return 0; 1276 if(c->ssl_shake_state != comm_ssl_shake_none) 1277 return 1; 1278 } 1279 /* ignore return, if fails we may simply block */ 1280 (void)SSL_set_mode(c->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE); 1281 if(c->tcp_byte_count < sizeof(uint16_t)) { 1282 uint16_t len = htons(sldns_buffer_limit(c->buffer)); 1283 ERR_clear_error(); 1284 if(sizeof(uint16_t)+sldns_buffer_remaining(c->buffer) < 1285 LDNS_RR_BUF_SIZE) { 1286 /* combine the tcp length and the query for write, 1287 * this emulates writev */ 1288 uint8_t buf[LDNS_RR_BUF_SIZE]; 1289 memmove(buf, &len, sizeof(uint16_t)); 1290 memmove(buf+sizeof(uint16_t), 1291 sldns_buffer_current(c->buffer), 1292 sldns_buffer_remaining(c->buffer)); 1293 r = SSL_write(c->ssl, (void*)(buf+c->tcp_byte_count), 1294 (int)(sizeof(uint16_t)+ 1295 sldns_buffer_remaining(c->buffer) 1296 - c->tcp_byte_count)); 1297 } else { 1298 r = SSL_write(c->ssl, 1299 (void*)(((uint8_t*)&len)+c->tcp_byte_count), 1300 (int)(sizeof(uint16_t)-c->tcp_byte_count)); 1301 } 1302 if(r <= 0) { 1303 int want = SSL_get_error(c->ssl, r); 1304 if(want == SSL_ERROR_ZERO_RETURN) { 1305 return 0; /* closed */ 1306 } else if(want == SSL_ERROR_WANT_READ) { 1307 c->ssl_shake_state = comm_ssl_shake_hs_read; 1308 comm_point_listen_for_rw(c, 1, 0); 1309 return 1; /* wait for read condition */ 1310 } else if(want == SSL_ERROR_WANT_WRITE) { 1311 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_WRITE); 1312 return 1; /* write more later */ 1313 } else if(want == SSL_ERROR_SYSCALL) { 1314 #ifdef EPIPE 1315 if(errno == EPIPE && verbosity < 2) 1316 return 0; /* silence 'broken pipe' */ 1317 #endif 1318 if(errno != 0) 1319 log_err("SSL_write syscall: %s", 1320 strerror(errno)); 1321 return 0; 1322 } 1323 log_crypto_err("could not SSL_write"); 1324 return 0; 1325 } 1326 c->tcp_byte_count += r; 1327 if(c->tcp_byte_count < sizeof(uint16_t)) 1328 return 1; 1329 sldns_buffer_set_position(c->buffer, c->tcp_byte_count - 1330 sizeof(uint16_t)); 1331 if(sldns_buffer_remaining(c->buffer) == 0) { 1332 tcp_callback_writer(c); 1333 return 1; 1334 } 1335 } 1336 log_assert(sldns_buffer_remaining(c->buffer) > 0); 1337 ERR_clear_error(); 1338 r = SSL_write(c->ssl, (void*)sldns_buffer_current(c->buffer), 1339 (int)sldns_buffer_remaining(c->buffer)); 1340 if(r <= 0) { 1341 int want = SSL_get_error(c->ssl, r); 1342 if(want == SSL_ERROR_ZERO_RETURN) { 1343 return 0; /* closed */ 1344 } else if(want == SSL_ERROR_WANT_READ) { 1345 c->ssl_shake_state = comm_ssl_shake_hs_read; 1346 comm_point_listen_for_rw(c, 1, 0); 1347 return 1; /* wait for read condition */ 1348 } else if(want == SSL_ERROR_WANT_WRITE) { 1349 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_WRITE); 1350 return 1; /* write more later */ 1351 } else if(want == SSL_ERROR_SYSCALL) { 1352 #ifdef EPIPE 1353 if(errno == EPIPE && verbosity < 2) 1354 return 0; /* silence 'broken pipe' */ 1355 #endif 1356 if(errno != 0) 1357 log_err("SSL_write syscall: %s", 1358 strerror(errno)); 1359 return 0; 1360 } 1361 log_crypto_err("could not SSL_write"); 1362 return 0; 1363 } 1364 sldns_buffer_skip(c->buffer, (ssize_t)r); 1365 1366 if(sldns_buffer_remaining(c->buffer) == 0) { 1367 tcp_callback_writer(c); 1368 } 1369 return 1; 1370 #else 1371 (void)c; 1372 return 0; 1373 #endif /* HAVE_SSL */ 1374 } 1375 1376 /** handle ssl tcp connection with dns contents */ 1377 static int 1378 ssl_handle_it(struct comm_point* c) 1379 { 1380 if(c->tcp_is_reading) 1381 return ssl_handle_read(c); 1382 return ssl_handle_write(c); 1383 } 1384 1385 /** Handle tcp reading callback. 1386 * @param fd: file descriptor of socket. 1387 * @param c: comm point to read from into buffer. 1388 * @param short_ok: if true, very short packets are OK (for comm_local). 1389 * @return: 0 on error 1390 */ 1391 static int 1392 comm_point_tcp_handle_read(int fd, struct comm_point* c, int short_ok) 1393 { 1394 ssize_t r; 1395 log_assert(c->type == comm_tcp || c->type == comm_local); 1396 if(c->ssl) 1397 return ssl_handle_it(c); 1398 if(!c->tcp_is_reading) 1399 return 0; 1400 1401 log_assert(fd != -1); 1402 if(c->tcp_byte_count < sizeof(uint16_t)) { 1403 /* read length bytes */ 1404 r = recv(fd,(void*)sldns_buffer_at(c->buffer,c->tcp_byte_count), 1405 sizeof(uint16_t)-c->tcp_byte_count, 0); 1406 if(r == 0) { 1407 if(c->tcp_req_info) 1408 return tcp_req_info_handle_read_close(c->tcp_req_info); 1409 return 0; 1410 } else if(r == -1) { 1411 #ifndef USE_WINSOCK 1412 if(errno == EINTR || errno == EAGAIN) 1413 return 1; 1414 #ifdef ECONNRESET 1415 if(errno == ECONNRESET && verbosity < 2) 1416 return 0; /* silence reset by peer */ 1417 #endif 1418 log_err_addr("read (in tcp s)", strerror(errno), 1419 &c->repinfo.addr, c->repinfo.addrlen); 1420 #else /* USE_WINSOCK */ 1421 if(WSAGetLastError() == WSAECONNRESET) 1422 return 0; 1423 if(WSAGetLastError() == WSAEINPROGRESS) 1424 return 1; 1425 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1426 ub_winsock_tcp_wouldblock(c->ev->ev, 1427 UB_EV_READ); 1428 return 1; 1429 } 1430 log_err_addr("read (in tcp s)", 1431 wsa_strerror(WSAGetLastError()), 1432 &c->repinfo.addr, c->repinfo.addrlen); 1433 #endif 1434 return 0; 1435 } 1436 c->tcp_byte_count += r; 1437 if(c->tcp_byte_count != sizeof(uint16_t)) 1438 return 1; 1439 if(sldns_buffer_read_u16_at(c->buffer, 0) > 1440 sldns_buffer_capacity(c->buffer)) { 1441 verbose(VERB_QUERY, "tcp: dropped larger than buffer"); 1442 return 0; 1443 } 1444 sldns_buffer_set_limit(c->buffer, 1445 sldns_buffer_read_u16_at(c->buffer, 0)); 1446 if(!short_ok && 1447 sldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) { 1448 verbose(VERB_QUERY, "tcp: dropped bogus too short."); 1449 return 0; 1450 } 1451 verbose(VERB_ALGO, "Reading tcp query of length %d", 1452 (int)sldns_buffer_limit(c->buffer)); 1453 } 1454 1455 log_assert(sldns_buffer_remaining(c->buffer) > 0); 1456 r = recv(fd, (void*)sldns_buffer_current(c->buffer), 1457 sldns_buffer_remaining(c->buffer), 0); 1458 if(r == 0) { 1459 if(c->tcp_req_info) 1460 return tcp_req_info_handle_read_close(c->tcp_req_info); 1461 return 0; 1462 } else if(r == -1) { 1463 #ifndef USE_WINSOCK 1464 if(errno == EINTR || errno == EAGAIN) 1465 return 1; 1466 log_err_addr("read (in tcp r)", strerror(errno), 1467 &c->repinfo.addr, c->repinfo.addrlen); 1468 #else /* USE_WINSOCK */ 1469 if(WSAGetLastError() == WSAECONNRESET) 1470 return 0; 1471 if(WSAGetLastError() == WSAEINPROGRESS) 1472 return 1; 1473 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1474 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_READ); 1475 return 1; 1476 } 1477 log_err_addr("read (in tcp r)", 1478 wsa_strerror(WSAGetLastError()), 1479 &c->repinfo.addr, c->repinfo.addrlen); 1480 #endif 1481 return 0; 1482 } 1483 sldns_buffer_skip(c->buffer, r); 1484 if(sldns_buffer_remaining(c->buffer) <= 0) { 1485 tcp_callback_reader(c); 1486 } 1487 return 1; 1488 } 1489 1490 /** 1491 * Handle tcp writing callback. 1492 * @param fd: file descriptor of socket. 1493 * @param c: comm point to write buffer out of. 1494 * @return: 0 on error 1495 */ 1496 static int 1497 comm_point_tcp_handle_write(int fd, struct comm_point* c) 1498 { 1499 ssize_t r; 1500 struct sldns_buffer *buffer; 1501 log_assert(c->type == comm_tcp); 1502 #ifdef USE_DNSCRYPT 1503 buffer = c->dnscrypt_buffer; 1504 #else 1505 buffer = c->buffer; 1506 #endif 1507 if(c->tcp_is_reading && !c->ssl) 1508 return 0; 1509 log_assert(fd != -1); 1510 if(c->tcp_byte_count == 0 && c->tcp_check_nb_connect) { 1511 /* check for pending error from nonblocking connect */ 1512 /* from Stevens, unix network programming, vol1, 3rd ed, p450*/ 1513 int error = 0; 1514 socklen_t len = (socklen_t)sizeof(error); 1515 if(getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&error, 1516 &len) < 0){ 1517 #ifndef USE_WINSOCK 1518 error = errno; /* on solaris errno is error */ 1519 #else /* USE_WINSOCK */ 1520 error = WSAGetLastError(); 1521 #endif 1522 } 1523 #ifndef USE_WINSOCK 1524 #if defined(EINPROGRESS) && defined(EWOULDBLOCK) 1525 if(error == EINPROGRESS || error == EWOULDBLOCK) 1526 return 1; /* try again later */ 1527 else 1528 #endif 1529 if(error != 0 && verbosity < 2) 1530 return 0; /* silence lots of chatter in the logs */ 1531 else if(error != 0) { 1532 log_err_addr("tcp connect", strerror(error), 1533 &c->repinfo.addr, c->repinfo.addrlen); 1534 #else /* USE_WINSOCK */ 1535 /* examine error */ 1536 if(error == WSAEINPROGRESS) 1537 return 1; 1538 else if(error == WSAEWOULDBLOCK) { 1539 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_WRITE); 1540 return 1; 1541 } else if(error != 0 && verbosity < 2) 1542 return 0; 1543 else if(error != 0) { 1544 log_err_addr("tcp connect", wsa_strerror(error), 1545 &c->repinfo.addr, c->repinfo.addrlen); 1546 #endif /* USE_WINSOCK */ 1547 return 0; 1548 } 1549 } 1550 if(c->ssl) 1551 return ssl_handle_it(c); 1552 1553 #ifdef USE_MSG_FASTOPEN 1554 /* Only try this on first use of a connection that uses tfo, 1555 otherwise fall through to normal write */ 1556 /* Also, TFO support on WINDOWS not implemented at the moment */ 1557 if(c->tcp_do_fastopen == 1) { 1558 /* this form of sendmsg() does both a connect() and send() so need to 1559 look for various flavours of error*/ 1560 uint16_t len = htons(sldns_buffer_limit(buffer)); 1561 struct msghdr msg; 1562 struct iovec iov[2]; 1563 c->tcp_do_fastopen = 0; 1564 memset(&msg, 0, sizeof(msg)); 1565 iov[0].iov_base = (uint8_t*)&len + c->tcp_byte_count; 1566 iov[0].iov_len = sizeof(uint16_t) - c->tcp_byte_count; 1567 iov[1].iov_base = sldns_buffer_begin(buffer); 1568 iov[1].iov_len = sldns_buffer_limit(buffer); 1569 log_assert(iov[0].iov_len > 0); 1570 msg.msg_name = &c->repinfo.addr; 1571 msg.msg_namelen = c->repinfo.addrlen; 1572 msg.msg_iov = iov; 1573 msg.msg_iovlen = 2; 1574 r = sendmsg(fd, &msg, MSG_FASTOPEN); 1575 if (r == -1) { 1576 #if defined(EINPROGRESS) && defined(EWOULDBLOCK) 1577 /* Handshake is underway, maybe because no TFO cookie available. 1578 Come back to write the message*/ 1579 if(errno == EINPROGRESS || errno == EWOULDBLOCK) 1580 return 1; 1581 #endif 1582 if(errno == EINTR || errno == EAGAIN) 1583 return 1; 1584 /* Not handling EISCONN here as shouldn't ever hit that case.*/ 1585 if(errno != EPIPE && errno != 0 && verbosity < 2) 1586 return 0; /* silence lots of chatter in the logs */ 1587 if(errno != EPIPE && errno != 0) { 1588 log_err_addr("tcp sendmsg", strerror(errno), 1589 &c->repinfo.addr, c->repinfo.addrlen); 1590 return 0; 1591 } 1592 /* fallthrough to nonFASTOPEN 1593 * (MSG_FASTOPEN on Linux 3 produces EPIPE) 1594 * we need to perform connect() */ 1595 if(connect(fd, (struct sockaddr *)&c->repinfo.addr, c->repinfo.addrlen) == -1) { 1596 #ifdef EINPROGRESS 1597 if(errno == EINPROGRESS) 1598 return 1; /* wait until connect done*/ 1599 #endif 1600 #ifdef USE_WINSOCK 1601 if(WSAGetLastError() == WSAEINPROGRESS || 1602 WSAGetLastError() == WSAEWOULDBLOCK) 1603 return 1; /* wait until connect done*/ 1604 #endif 1605 if(tcp_connect_errno_needs_log( 1606 (struct sockaddr *)&c->repinfo.addr, c->repinfo.addrlen)) { 1607 log_err_addr("outgoing tcp: connect after EPIPE for fastopen", 1608 strerror(errno), &c->repinfo.addr, c->repinfo.addrlen); 1609 } 1610 return 0; 1611 } 1612 1613 } else { 1614 c->tcp_byte_count += r; 1615 if(c->tcp_byte_count < sizeof(uint16_t)) 1616 return 1; 1617 sldns_buffer_set_position(buffer, c->tcp_byte_count - 1618 sizeof(uint16_t)); 1619 if(sldns_buffer_remaining(buffer) == 0) { 1620 tcp_callback_writer(c); 1621 return 1; 1622 } 1623 } 1624 } 1625 #endif /* USE_MSG_FASTOPEN */ 1626 1627 if(c->tcp_byte_count < sizeof(uint16_t)) { 1628 uint16_t len = htons(sldns_buffer_limit(buffer)); 1629 #ifdef HAVE_WRITEV 1630 struct iovec iov[2]; 1631 iov[0].iov_base = (uint8_t*)&len + c->tcp_byte_count; 1632 iov[0].iov_len = sizeof(uint16_t) - c->tcp_byte_count; 1633 iov[1].iov_base = sldns_buffer_begin(buffer); 1634 iov[1].iov_len = sldns_buffer_limit(buffer); 1635 log_assert(iov[0].iov_len > 0); 1636 r = writev(fd, iov, 2); 1637 #else /* HAVE_WRITEV */ 1638 r = send(fd, (void*)(((uint8_t*)&len)+c->tcp_byte_count), 1639 sizeof(uint16_t)-c->tcp_byte_count, 0); 1640 #endif /* HAVE_WRITEV */ 1641 if(r == -1) { 1642 #ifndef USE_WINSOCK 1643 # ifdef EPIPE 1644 if(errno == EPIPE && verbosity < 2) 1645 return 0; /* silence 'broken pipe' */ 1646 #endif 1647 if(errno == EINTR || errno == EAGAIN) 1648 return 1; 1649 #ifdef ECONNRESET 1650 if(errno == ECONNRESET && verbosity < 2) 1651 return 0; /* silence reset by peer */ 1652 #endif 1653 # ifdef HAVE_WRITEV 1654 log_err_addr("tcp writev", strerror(errno), 1655 &c->repinfo.addr, c->repinfo.addrlen); 1656 # else /* HAVE_WRITEV */ 1657 log_err_addr("tcp send s", strerror(errno), 1658 &c->repinfo.addr, c->repinfo.addrlen); 1659 # endif /* HAVE_WRITEV */ 1660 #else 1661 if(WSAGetLastError() == WSAENOTCONN) 1662 return 1; 1663 if(WSAGetLastError() == WSAEINPROGRESS) 1664 return 1; 1665 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1666 ub_winsock_tcp_wouldblock(c->ev->ev, 1667 UB_EV_WRITE); 1668 return 1; 1669 } 1670 if(WSAGetLastError() == WSAECONNRESET && verbosity < 2) 1671 return 0; /* silence reset by peer */ 1672 log_err_addr("tcp send s", 1673 wsa_strerror(WSAGetLastError()), 1674 &c->repinfo.addr, c->repinfo.addrlen); 1675 #endif 1676 return 0; 1677 } 1678 c->tcp_byte_count += r; 1679 if(c->tcp_byte_count < sizeof(uint16_t)) 1680 return 1; 1681 sldns_buffer_set_position(buffer, c->tcp_byte_count - 1682 sizeof(uint16_t)); 1683 if(sldns_buffer_remaining(buffer) == 0) { 1684 tcp_callback_writer(c); 1685 return 1; 1686 } 1687 } 1688 log_assert(sldns_buffer_remaining(buffer) > 0); 1689 r = send(fd, (void*)sldns_buffer_current(buffer), 1690 sldns_buffer_remaining(buffer), 0); 1691 if(r == -1) { 1692 #ifndef USE_WINSOCK 1693 if(errno == EINTR || errno == EAGAIN) 1694 return 1; 1695 #ifdef ECONNRESET 1696 if(errno == ECONNRESET && verbosity < 2) 1697 return 0; /* silence reset by peer */ 1698 #endif 1699 log_err_addr("tcp send r", strerror(errno), 1700 &c->repinfo.addr, c->repinfo.addrlen); 1701 #else 1702 if(WSAGetLastError() == WSAEINPROGRESS) 1703 return 1; 1704 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1705 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_WRITE); 1706 return 1; 1707 } 1708 if(WSAGetLastError() == WSAECONNRESET && verbosity < 2) 1709 return 0; /* silence reset by peer */ 1710 log_err_addr("tcp send r", wsa_strerror(WSAGetLastError()), 1711 &c->repinfo.addr, c->repinfo.addrlen); 1712 #endif 1713 return 0; 1714 } 1715 sldns_buffer_skip(buffer, r); 1716 1717 if(sldns_buffer_remaining(buffer) == 0) { 1718 tcp_callback_writer(c); 1719 } 1720 1721 return 1; 1722 } 1723 1724 /** read again to drain buffers when there could be more to read */ 1725 static void 1726 tcp_req_info_read_again(int fd, struct comm_point* c) 1727 { 1728 while(c->tcp_req_info->read_again) { 1729 int r; 1730 c->tcp_req_info->read_again = 0; 1731 if(c->tcp_is_reading) 1732 r = comm_point_tcp_handle_read(fd, c, 0); 1733 else r = comm_point_tcp_handle_write(fd, c); 1734 if(!r) { 1735 reclaim_tcp_handler(c); 1736 if(!c->tcp_do_close) { 1737 fptr_ok(fptr_whitelist_comm_point( 1738 c->callback)); 1739 (void)(*c->callback)(c, c->cb_arg, 1740 NETEVENT_CLOSED, NULL); 1741 } 1742 return; 1743 } 1744 } 1745 } 1746 1747 void 1748 comm_point_tcp_handle_callback(int fd, short event, void* arg) 1749 { 1750 struct comm_point* c = (struct comm_point*)arg; 1751 log_assert(c->type == comm_tcp); 1752 ub_comm_base_now(c->ev->base); 1753 1754 #ifdef USE_DNSCRYPT 1755 /* Initialize if this is a dnscrypt socket */ 1756 if(c->tcp_parent) { 1757 c->dnscrypt = c->tcp_parent->dnscrypt; 1758 } 1759 if(c->dnscrypt && c->dnscrypt_buffer == c->buffer) { 1760 c->dnscrypt_buffer = sldns_buffer_new(sldns_buffer_capacity(c->buffer)); 1761 if(!c->dnscrypt_buffer) { 1762 log_err("Could not allocate dnscrypt buffer"); 1763 reclaim_tcp_handler(c); 1764 if(!c->tcp_do_close) { 1765 fptr_ok(fptr_whitelist_comm_point( 1766 c->callback)); 1767 (void)(*c->callback)(c, c->cb_arg, 1768 NETEVENT_CLOSED, NULL); 1769 } 1770 return; 1771 } 1772 } 1773 #endif 1774 1775 if(event&UB_EV_TIMEOUT) { 1776 verbose(VERB_QUERY, "tcp took too long, dropped"); 1777 reclaim_tcp_handler(c); 1778 if(!c->tcp_do_close) { 1779 fptr_ok(fptr_whitelist_comm_point(c->callback)); 1780 (void)(*c->callback)(c, c->cb_arg, 1781 NETEVENT_TIMEOUT, NULL); 1782 } 1783 return; 1784 } 1785 if(event&UB_EV_READ) { 1786 int has_tcpq = (c->tcp_req_info != NULL); 1787 if(!comm_point_tcp_handle_read(fd, c, 0)) { 1788 reclaim_tcp_handler(c); 1789 if(!c->tcp_do_close) { 1790 fptr_ok(fptr_whitelist_comm_point( 1791 c->callback)); 1792 (void)(*c->callback)(c, c->cb_arg, 1793 NETEVENT_CLOSED, NULL); 1794 } 1795 } 1796 if(has_tcpq && c->tcp_req_info && c->tcp_req_info->read_again) 1797 tcp_req_info_read_again(fd, c); 1798 return; 1799 } 1800 if(event&UB_EV_WRITE) { 1801 int has_tcpq = (c->tcp_req_info != NULL); 1802 if(!comm_point_tcp_handle_write(fd, c)) { 1803 reclaim_tcp_handler(c); 1804 if(!c->tcp_do_close) { 1805 fptr_ok(fptr_whitelist_comm_point( 1806 c->callback)); 1807 (void)(*c->callback)(c, c->cb_arg, 1808 NETEVENT_CLOSED, NULL); 1809 } 1810 } 1811 if(has_tcpq && c->tcp_req_info && c->tcp_req_info->read_again) 1812 tcp_req_info_read_again(fd, c); 1813 return; 1814 } 1815 log_err("Ignored event %d for tcphdl.", event); 1816 } 1817 1818 /** Make http handler free for next assignment */ 1819 static void 1820 reclaim_http_handler(struct comm_point* c) 1821 { 1822 log_assert(c->type == comm_http); 1823 if(c->ssl) { 1824 #ifdef HAVE_SSL 1825 SSL_shutdown(c->ssl); 1826 SSL_free(c->ssl); 1827 c->ssl = NULL; 1828 #endif 1829 } 1830 comm_point_close(c); 1831 if(c->tcp_parent) { 1832 c->tcp_parent->cur_tcp_count--; 1833 c->tcp_free = c->tcp_parent->tcp_free; 1834 c->tcp_parent->tcp_free = c; 1835 if(!c->tcp_free) { 1836 /* re-enable listening on accept socket */ 1837 comm_point_start_listening(c->tcp_parent, -1, -1); 1838 } 1839 } 1840 } 1841 1842 /** read more data for http (with ssl) */ 1843 static int 1844 ssl_http_read_more(struct comm_point* c) 1845 { 1846 #ifdef HAVE_SSL 1847 int r; 1848 log_assert(sldns_buffer_remaining(c->buffer) > 0); 1849 ERR_clear_error(); 1850 r = SSL_read(c->ssl, (void*)sldns_buffer_current(c->buffer), 1851 (int)sldns_buffer_remaining(c->buffer)); 1852 if(r <= 0) { 1853 int want = SSL_get_error(c->ssl, r); 1854 if(want == SSL_ERROR_ZERO_RETURN) { 1855 return 0; /* shutdown, closed */ 1856 } else if(want == SSL_ERROR_WANT_READ) { 1857 return 1; /* read more later */ 1858 } else if(want == SSL_ERROR_WANT_WRITE) { 1859 c->ssl_shake_state = comm_ssl_shake_hs_write; 1860 comm_point_listen_for_rw(c, 0, 1); 1861 return 1; 1862 } else if(want == SSL_ERROR_SYSCALL) { 1863 #ifdef ECONNRESET 1864 if(errno == ECONNRESET && verbosity < 2) 1865 return 0; /* silence reset by peer */ 1866 #endif 1867 if(errno != 0) 1868 log_err("SSL_read syscall: %s", 1869 strerror(errno)); 1870 return 0; 1871 } 1872 log_crypto_err("could not SSL_read"); 1873 return 0; 1874 } 1875 sldns_buffer_skip(c->buffer, (ssize_t)r); 1876 return 1; 1877 #else 1878 (void)c; 1879 return 0; 1880 #endif /* HAVE_SSL */ 1881 } 1882 1883 /** read more data for http */ 1884 static int 1885 http_read_more(int fd, struct comm_point* c) 1886 { 1887 ssize_t r; 1888 log_assert(sldns_buffer_remaining(c->buffer) > 0); 1889 r = recv(fd, (void*)sldns_buffer_current(c->buffer), 1890 sldns_buffer_remaining(c->buffer), 0); 1891 if(r == 0) { 1892 return 0; 1893 } else if(r == -1) { 1894 #ifndef USE_WINSOCK 1895 if(errno == EINTR || errno == EAGAIN) 1896 return 1; 1897 log_err_addr("read (in http r)", strerror(errno), 1898 &c->repinfo.addr, c->repinfo.addrlen); 1899 #else /* USE_WINSOCK */ 1900 if(WSAGetLastError() == WSAECONNRESET) 1901 return 0; 1902 if(WSAGetLastError() == WSAEINPROGRESS) 1903 return 1; 1904 if(WSAGetLastError() == WSAEWOULDBLOCK) { 1905 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_READ); 1906 return 1; 1907 } 1908 log_err_addr("read (in http r)", 1909 wsa_strerror(WSAGetLastError()), 1910 &c->repinfo.addr, c->repinfo.addrlen); 1911 #endif 1912 return 0; 1913 } 1914 sldns_buffer_skip(c->buffer, r); 1915 return 1; 1916 } 1917 1918 /** return true if http header has been read (one line complete) */ 1919 static int 1920 http_header_done(sldns_buffer* buf) 1921 { 1922 size_t i; 1923 for(i=sldns_buffer_position(buf); i<sldns_buffer_limit(buf); i++) { 1924 /* there was a \r before the \n, but we ignore that */ 1925 if((char)sldns_buffer_read_u8_at(buf, i) == '\n') 1926 return 1; 1927 } 1928 return 0; 1929 } 1930 1931 /** return character string into buffer for header line, moves buffer 1932 * past that line and puts zero terminator into linefeed-newline */ 1933 static char* 1934 http_header_line(sldns_buffer* buf) 1935 { 1936 char* result = (char*)sldns_buffer_current(buf); 1937 size_t i; 1938 for(i=sldns_buffer_position(buf); i<sldns_buffer_limit(buf); i++) { 1939 /* terminate the string on the \r */ 1940 if((char)sldns_buffer_read_u8_at(buf, i) == '\r') 1941 sldns_buffer_write_u8_at(buf, i, 0); 1942 /* terminate on the \n and skip past the it and done */ 1943 if((char)sldns_buffer_read_u8_at(buf, i) == '\n') { 1944 sldns_buffer_write_u8_at(buf, i, 0); 1945 sldns_buffer_set_position(buf, i+1); 1946 return result; 1947 } 1948 } 1949 return NULL; 1950 } 1951 1952 /** move unread buffer to start and clear rest for putting the rest into it */ 1953 static void 1954 http_moveover_buffer(sldns_buffer* buf) 1955 { 1956 size_t pos = sldns_buffer_position(buf); 1957 size_t len = sldns_buffer_remaining(buf); 1958 sldns_buffer_clear(buf); 1959 memmove(sldns_buffer_begin(buf), sldns_buffer_at(buf, pos), len); 1960 sldns_buffer_set_position(buf, len); 1961 } 1962 1963 /** a http header is complete, process it */ 1964 static int 1965 http_process_initial_header(struct comm_point* c) 1966 { 1967 char* line = http_header_line(c->buffer); 1968 if(!line) return 1; 1969 verbose(VERB_ALGO, "http header: %s", line); 1970 if(strncasecmp(line, "HTTP/1.1 ", 9) == 0) { 1971 /* check returncode */ 1972 if(line[9] != '2') { 1973 verbose(VERB_ALGO, "http bad status %s", line+9); 1974 return 0; 1975 } 1976 } else if(strncasecmp(line, "Content-Length: ", 16) == 0) { 1977 if(!c->http_is_chunked) 1978 c->tcp_byte_count = (size_t)atoi(line+16); 1979 } else if(strncasecmp(line, "Transfer-Encoding: chunked", 19+7) == 0) { 1980 c->tcp_byte_count = 0; 1981 c->http_is_chunked = 1; 1982 } else if(line[0] == 0) { 1983 /* end of initial headers */ 1984 c->http_in_headers = 0; 1985 if(c->http_is_chunked) 1986 c->http_in_chunk_headers = 1; 1987 /* remove header text from front of buffer 1988 * the buffer is going to be used to return the data segment 1989 * itself and we don't want the header to get returned 1990 * prepended with it */ 1991 http_moveover_buffer(c->buffer); 1992 sldns_buffer_flip(c->buffer); 1993 return 1; 1994 } 1995 /* ignore other headers */ 1996 return 1; 1997 } 1998 1999 /** a chunk header is complete, process it, return 0=fail, 1=continue next 2000 * header line, 2=done with chunked transfer*/ 2001 static int 2002 http_process_chunk_header(struct comm_point* c) 2003 { 2004 char* line = http_header_line(c->buffer); 2005 if(!line) return 1; 2006 if(c->http_in_chunk_headers == 3) { 2007 verbose(VERB_ALGO, "http chunk trailer: %s", line); 2008 /* are we done ? */ 2009 if(line[0] == 0 && c->tcp_byte_count == 0) { 2010 /* callback of http reader when NETEVENT_DONE, 2011 * end of data, with no data in buffer */ 2012 sldns_buffer_set_position(c->buffer, 0); 2013 sldns_buffer_set_limit(c->buffer, 0); 2014 fptr_ok(fptr_whitelist_comm_point(c->callback)); 2015 (void)(*c->callback)(c, c->cb_arg, NETEVENT_DONE, NULL); 2016 /* return that we are done */ 2017 return 2; 2018 } 2019 if(line[0] == 0) { 2020 /* continue with header of the next chunk */ 2021 c->http_in_chunk_headers = 1; 2022 /* remove header text from front of buffer */ 2023 http_moveover_buffer(c->buffer); 2024 sldns_buffer_flip(c->buffer); 2025 return 1; 2026 } 2027 /* ignore further trail headers */ 2028 return 1; 2029 } 2030 verbose(VERB_ALGO, "http chunk header: %s", line); 2031 if(c->http_in_chunk_headers == 1) { 2032 /* read chunked start line */ 2033 char* end = NULL; 2034 c->tcp_byte_count = (size_t)strtol(line, &end, 16); 2035 if(end == line) 2036 return 0; 2037 c->http_in_chunk_headers = 0; 2038 /* remove header text from front of buffer */ 2039 http_moveover_buffer(c->buffer); 2040 sldns_buffer_flip(c->buffer); 2041 if(c->tcp_byte_count == 0) { 2042 /* done with chunks, process chunk_trailer lines */ 2043 c->http_in_chunk_headers = 3; 2044 } 2045 return 1; 2046 } 2047 /* ignore other headers */ 2048 return 1; 2049 } 2050 2051 /** handle nonchunked data segment */ 2052 static int 2053 http_nonchunk_segment(struct comm_point* c) 2054 { 2055 /* c->buffer at position..limit has new data we read in. 2056 * the buffer itself is full of nonchunked data. 2057 * we are looking to read tcp_byte_count more data 2058 * and then the transfer is done. */ 2059 size_t remainbufferlen; 2060 size_t got_now = sldns_buffer_limit(c->buffer) - c->http_stored; 2061 if(c->tcp_byte_count <= got_now) { 2062 /* done, this is the last data fragment */ 2063 c->http_stored = 0; 2064 sldns_buffer_set_position(c->buffer, 0); 2065 fptr_ok(fptr_whitelist_comm_point(c->callback)); 2066 (void)(*c->callback)(c, c->cb_arg, NETEVENT_DONE, NULL); 2067 return 1; 2068 } 2069 c->tcp_byte_count -= got_now; 2070 /* if we have the buffer space, 2071 * read more data collected into the buffer */ 2072 remainbufferlen = sldns_buffer_capacity(c->buffer) - 2073 sldns_buffer_limit(c->buffer); 2074 if(remainbufferlen >= c->tcp_byte_count || 2075 remainbufferlen >= 2048) { 2076 size_t total = sldns_buffer_limit(c->buffer); 2077 sldns_buffer_clear(c->buffer); 2078 sldns_buffer_set_position(c->buffer, total); 2079 c->http_stored = total; 2080 /* return and wait to read more */ 2081 return 1; 2082 } 2083 /* call callback with this data amount, then 2084 * wait for more */ 2085 c->http_stored = 0; 2086 sldns_buffer_set_position(c->buffer, 0); 2087 fptr_ok(fptr_whitelist_comm_point(c->callback)); 2088 (void)(*c->callback)(c, c->cb_arg, NETEVENT_NOERROR, NULL); 2089 /* c->callback has to buffer_clear(c->buffer). */ 2090 /* return and wait to read more */ 2091 return 1; 2092 } 2093 2094 /** handle nonchunked data segment, return 0=fail, 1=wait, 2=process more */ 2095 static int 2096 http_chunked_segment(struct comm_point* c) 2097 { 2098 /* the c->buffer has from position..limit new data we read. */ 2099 /* the current chunk has length tcp_byte_count. 2100 * once we read that read more chunk headers. 2101 */ 2102 size_t remainbufferlen; 2103 size_t got_now = sldns_buffer_limit(c->buffer) - c->http_stored; 2104 if(c->tcp_byte_count <= got_now) { 2105 /* the chunk has completed (with perhaps some extra data 2106 * from next chunk header and next chunk) */ 2107 /* save too much info into temp buffer */ 2108 size_t fraglen; 2109 struct comm_reply repinfo; 2110 c->http_stored = 0; 2111 sldns_buffer_skip(c->buffer, (ssize_t)c->tcp_byte_count); 2112 sldns_buffer_clear(c->http_temp); 2113 sldns_buffer_write(c->http_temp, 2114 sldns_buffer_current(c->buffer), 2115 sldns_buffer_remaining(c->buffer)); 2116 sldns_buffer_flip(c->http_temp); 2117 2118 /* callback with this fragment */ 2119 fraglen = sldns_buffer_position(c->buffer); 2120 sldns_buffer_set_position(c->buffer, 0); 2121 sldns_buffer_set_limit(c->buffer, fraglen); 2122 repinfo = c->repinfo; 2123 fptr_ok(fptr_whitelist_comm_point(c->callback)); 2124 (void)(*c->callback)(c, c->cb_arg, NETEVENT_NOERROR, &repinfo); 2125 /* c->callback has to buffer_clear(). */ 2126 2127 /* is commpoint deleted? */ 2128 if(!repinfo.c) { 2129 return 1; 2130 } 2131 /* copy waiting info */ 2132 sldns_buffer_clear(c->buffer); 2133 sldns_buffer_write(c->buffer, 2134 sldns_buffer_begin(c->http_temp), 2135 sldns_buffer_remaining(c->http_temp)); 2136 sldns_buffer_flip(c->buffer); 2137 /* process end of chunk trailer header lines, until 2138 * an empty line */ 2139 c->http_in_chunk_headers = 3; 2140 /* process more data in buffer (if any) */ 2141 return 2; 2142 } 2143 c->tcp_byte_count -= got_now; 2144 2145 /* if we have the buffer space, 2146 * read more data collected into the buffer */ 2147 remainbufferlen = sldns_buffer_capacity(c->buffer) - 2148 sldns_buffer_limit(c->buffer); 2149 if(remainbufferlen >= c->tcp_byte_count || 2150 remainbufferlen >= 2048) { 2151 size_t total = sldns_buffer_limit(c->buffer); 2152 sldns_buffer_clear(c->buffer); 2153 sldns_buffer_set_position(c->buffer, total); 2154 c->http_stored = total; 2155 /* return and wait to read more */ 2156 return 1; 2157 } 2158 2159 /* callback of http reader for a new part of the data */ 2160 c->http_stored = 0; 2161 sldns_buffer_set_position(c->buffer, 0); 2162 fptr_ok(fptr_whitelist_comm_point(c->callback)); 2163 (void)(*c->callback)(c, c->cb_arg, NETEVENT_NOERROR, NULL); 2164 /* c->callback has to buffer_clear(c->buffer). */ 2165 /* return and wait to read more */ 2166 return 1; 2167 } 2168 2169 /** 2170 * Handle http reading callback. 2171 * @param fd: file descriptor of socket. 2172 * @param c: comm point to read from into buffer. 2173 * @return: 0 on error 2174 */ 2175 static int 2176 comm_point_http_handle_read(int fd, struct comm_point* c) 2177 { 2178 log_assert(c->type == comm_http); 2179 log_assert(fd != -1); 2180 2181 /* if we are in ssl handshake, handle SSL handshake */ 2182 #ifdef HAVE_SSL 2183 if(c->ssl && c->ssl_shake_state != comm_ssl_shake_none) { 2184 if(!ssl_handshake(c)) 2185 return 0; 2186 if(c->ssl_shake_state != comm_ssl_shake_none) 2187 return 1; 2188 } 2189 #endif /* HAVE_SSL */ 2190 2191 if(!c->tcp_is_reading) 2192 return 1; 2193 /* read more data */ 2194 if(c->ssl) { 2195 if(!ssl_http_read_more(c)) 2196 return 0; 2197 } else { 2198 if(!http_read_more(fd, c)) 2199 return 0; 2200 } 2201 2202 sldns_buffer_flip(c->buffer); 2203 while(sldns_buffer_remaining(c->buffer) > 0) { 2204 /* if we are reading headers, read more headers */ 2205 if(c->http_in_headers || c->http_in_chunk_headers) { 2206 /* if header is done, process the header */ 2207 if(!http_header_done(c->buffer)) { 2208 /* copy remaining data to front of buffer 2209 * and set rest for writing into it */ 2210 http_moveover_buffer(c->buffer); 2211 /* return and wait to read more */ 2212 return 1; 2213 } 2214 if(!c->http_in_chunk_headers) { 2215 /* process initial headers */ 2216 if(!http_process_initial_header(c)) 2217 return 0; 2218 } else { 2219 /* process chunk headers */ 2220 int r = http_process_chunk_header(c); 2221 if(r == 0) return 0; 2222 if(r == 2) return 1; /* done */ 2223 /* r == 1, continue */ 2224 } 2225 /* see if we have more to process */ 2226 continue; 2227 } 2228 2229 if(!c->http_is_chunked) { 2230 /* if we are reading nonchunks, process that*/ 2231 return http_nonchunk_segment(c); 2232 } else { 2233 /* if we are reading chunks, read the chunk */ 2234 int r = http_chunked_segment(c); 2235 if(r == 0) return 0; 2236 if(r == 1) return 1; 2237 continue; 2238 } 2239 } 2240 /* broke out of the loop; could not process header instead need 2241 * to read more */ 2242 /* moveover any remaining data and read more data */ 2243 http_moveover_buffer(c->buffer); 2244 /* return and wait to read more */ 2245 return 1; 2246 } 2247 2248 /** check pending connect for http */ 2249 static int 2250 http_check_connect(int fd, struct comm_point* c) 2251 { 2252 /* check for pending error from nonblocking connect */ 2253 /* from Stevens, unix network programming, vol1, 3rd ed, p450*/ 2254 int error = 0; 2255 socklen_t len = (socklen_t)sizeof(error); 2256 if(getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&error, 2257 &len) < 0){ 2258 #ifndef USE_WINSOCK 2259 error = errno; /* on solaris errno is error */ 2260 #else /* USE_WINSOCK */ 2261 error = WSAGetLastError(); 2262 #endif 2263 } 2264 #ifndef USE_WINSOCK 2265 #if defined(EINPROGRESS) && defined(EWOULDBLOCK) 2266 if(error == EINPROGRESS || error == EWOULDBLOCK) 2267 return 1; /* try again later */ 2268 else 2269 #endif 2270 if(error != 0 && verbosity < 2) 2271 return 0; /* silence lots of chatter in the logs */ 2272 else if(error != 0) { 2273 log_err_addr("http connect", strerror(error), 2274 &c->repinfo.addr, c->repinfo.addrlen); 2275 #else /* USE_WINSOCK */ 2276 /* examine error */ 2277 if(error == WSAEINPROGRESS) 2278 return 1; 2279 else if(error == WSAEWOULDBLOCK) { 2280 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_WRITE); 2281 return 1; 2282 } else if(error != 0 && verbosity < 2) 2283 return 0; 2284 else if(error != 0) { 2285 log_err_addr("http connect", wsa_strerror(error), 2286 &c->repinfo.addr, c->repinfo.addrlen); 2287 #endif /* USE_WINSOCK */ 2288 return 0; 2289 } 2290 /* keep on processing this socket */ 2291 return 2; 2292 } 2293 2294 /** write more data for http (with ssl) */ 2295 static int 2296 ssl_http_write_more(struct comm_point* c) 2297 { 2298 #ifdef HAVE_SSL 2299 int r; 2300 log_assert(sldns_buffer_remaining(c->buffer) > 0); 2301 ERR_clear_error(); 2302 r = SSL_write(c->ssl, (void*)sldns_buffer_current(c->buffer), 2303 (int)sldns_buffer_remaining(c->buffer)); 2304 if(r <= 0) { 2305 int want = SSL_get_error(c->ssl, r); 2306 if(want == SSL_ERROR_ZERO_RETURN) { 2307 return 0; /* closed */ 2308 } else if(want == SSL_ERROR_WANT_READ) { 2309 c->ssl_shake_state = comm_ssl_shake_hs_read; 2310 comm_point_listen_for_rw(c, 1, 0); 2311 return 1; /* wait for read condition */ 2312 } else if(want == SSL_ERROR_WANT_WRITE) { 2313 return 1; /* write more later */ 2314 } else if(want == SSL_ERROR_SYSCALL) { 2315 #ifdef EPIPE 2316 if(errno == EPIPE && verbosity < 2) 2317 return 0; /* silence 'broken pipe' */ 2318 #endif 2319 if(errno != 0) 2320 log_err("SSL_write syscall: %s", 2321 strerror(errno)); 2322 return 0; 2323 } 2324 log_crypto_err("could not SSL_write"); 2325 return 0; 2326 } 2327 sldns_buffer_skip(c->buffer, (ssize_t)r); 2328 return 1; 2329 #else 2330 (void)c; 2331 return 0; 2332 #endif /* HAVE_SSL */ 2333 } 2334 2335 /** write more data for http */ 2336 static int 2337 http_write_more(int fd, struct comm_point* c) 2338 { 2339 ssize_t r; 2340 log_assert(sldns_buffer_remaining(c->buffer) > 0); 2341 r = send(fd, (void*)sldns_buffer_current(c->buffer), 2342 sldns_buffer_remaining(c->buffer), 0); 2343 if(r == -1) { 2344 #ifndef USE_WINSOCK 2345 if(errno == EINTR || errno == EAGAIN) 2346 return 1; 2347 log_err_addr("http send r", strerror(errno), 2348 &c->repinfo.addr, c->repinfo.addrlen); 2349 #else 2350 if(WSAGetLastError() == WSAEINPROGRESS) 2351 return 1; 2352 if(WSAGetLastError() == WSAEWOULDBLOCK) { 2353 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_WRITE); 2354 return 1; 2355 } 2356 log_err_addr("http send r", wsa_strerror(WSAGetLastError()), 2357 &c->repinfo.addr, c->repinfo.addrlen); 2358 #endif 2359 return 0; 2360 } 2361 sldns_buffer_skip(c->buffer, r); 2362 return 1; 2363 } 2364 2365 /** 2366 * Handle http writing callback. 2367 * @param fd: file descriptor of socket. 2368 * @param c: comm point to write buffer out of. 2369 * @return: 0 on error 2370 */ 2371 static int 2372 comm_point_http_handle_write(int fd, struct comm_point* c) 2373 { 2374 log_assert(c->type == comm_http); 2375 log_assert(fd != -1); 2376 2377 /* check pending connect errors, if that fails, we wait for more, 2378 * or we can continue to write contents */ 2379 if(c->tcp_check_nb_connect) { 2380 int r = http_check_connect(fd, c); 2381 if(r == 0) return 0; 2382 if(r == 1) return 1; 2383 c->tcp_check_nb_connect = 0; 2384 } 2385 /* if we are in ssl handshake, handle SSL handshake */ 2386 #ifdef HAVE_SSL 2387 if(c->ssl && c->ssl_shake_state != comm_ssl_shake_none) { 2388 if(!ssl_handshake(c)) 2389 return 0; 2390 if(c->ssl_shake_state != comm_ssl_shake_none) 2391 return 1; 2392 } 2393 #endif /* HAVE_SSL */ 2394 if(c->tcp_is_reading) 2395 return 1; 2396 /* if we are writing, write more */ 2397 if(c->ssl) { 2398 if(!ssl_http_write_more(c)) 2399 return 0; 2400 } else { 2401 if(!http_write_more(fd, c)) 2402 return 0; 2403 } 2404 2405 /* we write a single buffer contents, that can contain 2406 * the http request, and then flip to read the results */ 2407 /* see if write is done */ 2408 if(sldns_buffer_remaining(c->buffer) == 0) { 2409 sldns_buffer_clear(c->buffer); 2410 if(c->tcp_do_toggle_rw) 2411 c->tcp_is_reading = 1; 2412 c->tcp_byte_count = 0; 2413 /* switch from listening(write) to listening(read) */ 2414 comm_point_stop_listening(c); 2415 comm_point_start_listening(c, -1, -1); 2416 } 2417 return 1; 2418 } 2419 2420 void 2421 comm_point_http_handle_callback(int fd, short event, void* arg) 2422 { 2423 struct comm_point* c = (struct comm_point*)arg; 2424 log_assert(c->type == comm_http); 2425 ub_comm_base_now(c->ev->base); 2426 2427 if(event&UB_EV_TIMEOUT) { 2428 verbose(VERB_QUERY, "http took too long, dropped"); 2429 reclaim_http_handler(c); 2430 if(!c->tcp_do_close) { 2431 fptr_ok(fptr_whitelist_comm_point(c->callback)); 2432 (void)(*c->callback)(c, c->cb_arg, 2433 NETEVENT_TIMEOUT, NULL); 2434 } 2435 return; 2436 } 2437 if(event&UB_EV_READ) { 2438 if(!comm_point_http_handle_read(fd, c)) { 2439 reclaim_http_handler(c); 2440 if(!c->tcp_do_close) { 2441 fptr_ok(fptr_whitelist_comm_point( 2442 c->callback)); 2443 (void)(*c->callback)(c, c->cb_arg, 2444 NETEVENT_CLOSED, NULL); 2445 } 2446 } 2447 return; 2448 } 2449 if(event&UB_EV_WRITE) { 2450 if(!comm_point_http_handle_write(fd, c)) { 2451 reclaim_http_handler(c); 2452 if(!c->tcp_do_close) { 2453 fptr_ok(fptr_whitelist_comm_point( 2454 c->callback)); 2455 (void)(*c->callback)(c, c->cb_arg, 2456 NETEVENT_CLOSED, NULL); 2457 } 2458 } 2459 return; 2460 } 2461 log_err("Ignored event %d for httphdl.", event); 2462 } 2463 2464 void comm_point_local_handle_callback(int fd, short event, void* arg) 2465 { 2466 struct comm_point* c = (struct comm_point*)arg; 2467 log_assert(c->type == comm_local); 2468 ub_comm_base_now(c->ev->base); 2469 2470 if(event&UB_EV_READ) { 2471 if(!comm_point_tcp_handle_read(fd, c, 1)) { 2472 fptr_ok(fptr_whitelist_comm_point(c->callback)); 2473 (void)(*c->callback)(c, c->cb_arg, NETEVENT_CLOSED, 2474 NULL); 2475 } 2476 return; 2477 } 2478 log_err("Ignored event %d for localhdl.", event); 2479 } 2480 2481 void comm_point_raw_handle_callback(int ATTR_UNUSED(fd), 2482 short event, void* arg) 2483 { 2484 struct comm_point* c = (struct comm_point*)arg; 2485 int err = NETEVENT_NOERROR; 2486 log_assert(c->type == comm_raw); 2487 ub_comm_base_now(c->ev->base); 2488 2489 if(event&UB_EV_TIMEOUT) 2490 err = NETEVENT_TIMEOUT; 2491 fptr_ok(fptr_whitelist_comm_point_raw(c->callback)); 2492 (void)(*c->callback)(c, c->cb_arg, err, NULL); 2493 } 2494 2495 struct comm_point* 2496 comm_point_create_udp(struct comm_base *base, int fd, sldns_buffer* buffer, 2497 comm_point_callback_type* callback, void* callback_arg) 2498 { 2499 struct comm_point* c = (struct comm_point*)calloc(1, 2500 sizeof(struct comm_point)); 2501 short evbits; 2502 if(!c) 2503 return NULL; 2504 c->ev = (struct internal_event*)calloc(1, 2505 sizeof(struct internal_event)); 2506 if(!c->ev) { 2507 free(c); 2508 return NULL; 2509 } 2510 c->ev->base = base; 2511 c->fd = fd; 2512 c->buffer = buffer; 2513 c->timeout = NULL; 2514 c->tcp_is_reading = 0; 2515 c->tcp_byte_count = 0; 2516 c->tcp_parent = NULL; 2517 c->max_tcp_count = 0; 2518 c->cur_tcp_count = 0; 2519 c->tcp_handlers = NULL; 2520 c->tcp_free = NULL; 2521 c->type = comm_udp; 2522 c->tcp_do_close = 0; 2523 c->do_not_close = 0; 2524 c->tcp_do_toggle_rw = 0; 2525 c->tcp_check_nb_connect = 0; 2526 #ifdef USE_MSG_FASTOPEN 2527 c->tcp_do_fastopen = 0; 2528 #endif 2529 #ifdef USE_DNSCRYPT 2530 c->dnscrypt = 0; 2531 c->dnscrypt_buffer = buffer; 2532 #endif 2533 c->inuse = 0; 2534 c->callback = callback; 2535 c->cb_arg = callback_arg; 2536 evbits = UB_EV_READ | UB_EV_PERSIST; 2537 /* ub_event stuff */ 2538 c->ev->ev = ub_event_new(base->eb->base, c->fd, evbits, 2539 comm_point_udp_callback, c); 2540 if(c->ev->ev == NULL) { 2541 log_err("could not baseset udp event"); 2542 comm_point_delete(c); 2543 return NULL; 2544 } 2545 if(fd!=-1 && ub_event_add(c->ev->ev, c->timeout) != 0 ) { 2546 log_err("could not add udp event"); 2547 comm_point_delete(c); 2548 return NULL; 2549 } 2550 return c; 2551 } 2552 2553 struct comm_point* 2554 comm_point_create_udp_ancil(struct comm_base *base, int fd, 2555 sldns_buffer* buffer, 2556 comm_point_callback_type* callback, void* callback_arg) 2557 { 2558 struct comm_point* c = (struct comm_point*)calloc(1, 2559 sizeof(struct comm_point)); 2560 short evbits; 2561 if(!c) 2562 return NULL; 2563 c->ev = (struct internal_event*)calloc(1, 2564 sizeof(struct internal_event)); 2565 if(!c->ev) { 2566 free(c); 2567 return NULL; 2568 } 2569 c->ev->base = base; 2570 c->fd = fd; 2571 c->buffer = buffer; 2572 c->timeout = NULL; 2573 c->tcp_is_reading = 0; 2574 c->tcp_byte_count = 0; 2575 c->tcp_parent = NULL; 2576 c->max_tcp_count = 0; 2577 c->cur_tcp_count = 0; 2578 c->tcp_handlers = NULL; 2579 c->tcp_free = NULL; 2580 c->type = comm_udp; 2581 c->tcp_do_close = 0; 2582 c->do_not_close = 0; 2583 #ifdef USE_DNSCRYPT 2584 c->dnscrypt = 0; 2585 c->dnscrypt_buffer = buffer; 2586 #endif 2587 c->inuse = 0; 2588 c->tcp_do_toggle_rw = 0; 2589 c->tcp_check_nb_connect = 0; 2590 #ifdef USE_MSG_FASTOPEN 2591 c->tcp_do_fastopen = 0; 2592 #endif 2593 c->callback = callback; 2594 c->cb_arg = callback_arg; 2595 evbits = UB_EV_READ | UB_EV_PERSIST; 2596 /* ub_event stuff */ 2597 c->ev->ev = ub_event_new(base->eb->base, c->fd, evbits, 2598 comm_point_udp_ancil_callback, c); 2599 if(c->ev->ev == NULL) { 2600 log_err("could not baseset udp event"); 2601 comm_point_delete(c); 2602 return NULL; 2603 } 2604 if(fd!=-1 && ub_event_add(c->ev->ev, c->timeout) != 0 ) { 2605 log_err("could not add udp event"); 2606 comm_point_delete(c); 2607 return NULL; 2608 } 2609 return c; 2610 } 2611 2612 static struct comm_point* 2613 comm_point_create_tcp_handler(struct comm_base *base, 2614 struct comm_point* parent, size_t bufsize, 2615 struct sldns_buffer* spoolbuf, comm_point_callback_type* callback, 2616 void* callback_arg) 2617 { 2618 struct comm_point* c = (struct comm_point*)calloc(1, 2619 sizeof(struct comm_point)); 2620 short evbits; 2621 if(!c) 2622 return NULL; 2623 c->ev = (struct internal_event*)calloc(1, 2624 sizeof(struct internal_event)); 2625 if(!c->ev) { 2626 free(c); 2627 return NULL; 2628 } 2629 c->ev->base = base; 2630 c->fd = -1; 2631 c->buffer = sldns_buffer_new(bufsize); 2632 if(!c->buffer) { 2633 free(c->ev); 2634 free(c); 2635 return NULL; 2636 } 2637 c->timeout = (struct timeval*)malloc(sizeof(struct timeval)); 2638 if(!c->timeout) { 2639 sldns_buffer_free(c->buffer); 2640 free(c->ev); 2641 free(c); 2642 return NULL; 2643 } 2644 c->tcp_is_reading = 0; 2645 c->tcp_byte_count = 0; 2646 c->tcp_parent = parent; 2647 c->tcp_timeout_msec = parent->tcp_timeout_msec; 2648 c->tcp_conn_limit = parent->tcp_conn_limit; 2649 c->tcl_addr = NULL; 2650 c->tcp_keepalive = 0; 2651 c->max_tcp_count = 0; 2652 c->cur_tcp_count = 0; 2653 c->tcp_handlers = NULL; 2654 c->tcp_free = NULL; 2655 c->type = comm_tcp; 2656 c->tcp_do_close = 0; 2657 c->do_not_close = 0; 2658 c->tcp_do_toggle_rw = 1; 2659 c->tcp_check_nb_connect = 0; 2660 #ifdef USE_MSG_FASTOPEN 2661 c->tcp_do_fastopen = 0; 2662 #endif 2663 #ifdef USE_DNSCRYPT 2664 c->dnscrypt = 0; 2665 /* We don't know just yet if this is a dnscrypt channel. Allocation 2666 * will be done when handling the callback. */ 2667 c->dnscrypt_buffer = c->buffer; 2668 #endif 2669 c->repinfo.c = c; 2670 c->callback = callback; 2671 c->cb_arg = callback_arg; 2672 if(spoolbuf) { 2673 c->tcp_req_info = tcp_req_info_create(spoolbuf); 2674 if(!c->tcp_req_info) { 2675 log_err("could not create tcp commpoint"); 2676 sldns_buffer_free(c->buffer); 2677 free(c->timeout); 2678 free(c->ev); 2679 free(c); 2680 return NULL; 2681 } 2682 c->tcp_req_info->cp = c; 2683 c->tcp_do_close = 1; 2684 c->tcp_do_toggle_rw = 0; 2685 } 2686 /* add to parent free list */ 2687 c->tcp_free = parent->tcp_free; 2688 parent->tcp_free = c; 2689 /* ub_event stuff */ 2690 evbits = UB_EV_PERSIST | UB_EV_READ | UB_EV_TIMEOUT; 2691 c->ev->ev = ub_event_new(base->eb->base, c->fd, evbits, 2692 comm_point_tcp_handle_callback, c); 2693 if(c->ev->ev == NULL) 2694 { 2695 log_err("could not basetset tcphdl event"); 2696 parent->tcp_free = c->tcp_free; 2697 tcp_req_info_delete(c->tcp_req_info); 2698 sldns_buffer_free(c->buffer); 2699 free(c->timeout); 2700 free(c->ev); 2701 free(c); 2702 return NULL; 2703 } 2704 return c; 2705 } 2706 2707 struct comm_point* 2708 comm_point_create_tcp(struct comm_base *base, int fd, int num, 2709 int idle_timeout, struct tcl_list* tcp_conn_limit, size_t bufsize, 2710 struct sldns_buffer* spoolbuf, comm_point_callback_type* callback, 2711 void* callback_arg) 2712 { 2713 struct comm_point* c = (struct comm_point*)calloc(1, 2714 sizeof(struct comm_point)); 2715 short evbits; 2716 int i; 2717 /* first allocate the TCP accept listener */ 2718 if(!c) 2719 return NULL; 2720 c->ev = (struct internal_event*)calloc(1, 2721 sizeof(struct internal_event)); 2722 if(!c->ev) { 2723 free(c); 2724 return NULL; 2725 } 2726 c->ev->base = base; 2727 c->fd = fd; 2728 c->buffer = NULL; 2729 c->timeout = NULL; 2730 c->tcp_is_reading = 0; 2731 c->tcp_byte_count = 0; 2732 c->tcp_timeout_msec = idle_timeout; 2733 c->tcp_conn_limit = tcp_conn_limit; 2734 c->tcl_addr = NULL; 2735 c->tcp_keepalive = 0; 2736 c->tcp_parent = NULL; 2737 c->max_tcp_count = num; 2738 c->cur_tcp_count = 0; 2739 c->tcp_handlers = (struct comm_point**)calloc((size_t)num, 2740 sizeof(struct comm_point*)); 2741 if(!c->tcp_handlers) { 2742 free(c->ev); 2743 free(c); 2744 return NULL; 2745 } 2746 c->tcp_free = NULL; 2747 c->type = comm_tcp_accept; 2748 c->tcp_do_close = 0; 2749 c->do_not_close = 0; 2750 c->tcp_do_toggle_rw = 0; 2751 c->tcp_check_nb_connect = 0; 2752 #ifdef USE_MSG_FASTOPEN 2753 c->tcp_do_fastopen = 0; 2754 #endif 2755 #ifdef USE_DNSCRYPT 2756 c->dnscrypt = 0; 2757 c->dnscrypt_buffer = NULL; 2758 #endif 2759 c->callback = NULL; 2760 c->cb_arg = NULL; 2761 evbits = UB_EV_READ | UB_EV_PERSIST; 2762 /* ub_event stuff */ 2763 c->ev->ev = ub_event_new(base->eb->base, c->fd, evbits, 2764 comm_point_tcp_accept_callback, c); 2765 if(c->ev->ev == NULL) { 2766 log_err("could not baseset tcpacc event"); 2767 comm_point_delete(c); 2768 return NULL; 2769 } 2770 if (ub_event_add(c->ev->ev, c->timeout) != 0) { 2771 log_err("could not add tcpacc event"); 2772 comm_point_delete(c); 2773 return NULL; 2774 } 2775 /* now prealloc the tcp handlers */ 2776 for(i=0; i<num; i++) { 2777 c->tcp_handlers[i] = comm_point_create_tcp_handler(base, 2778 c, bufsize, spoolbuf, callback, callback_arg); 2779 if(!c->tcp_handlers[i]) { 2780 comm_point_delete(c); 2781 return NULL; 2782 } 2783 } 2784 2785 return c; 2786 } 2787 2788 struct comm_point* 2789 comm_point_create_tcp_out(struct comm_base *base, size_t bufsize, 2790 comm_point_callback_type* callback, void* callback_arg) 2791 { 2792 struct comm_point* c = (struct comm_point*)calloc(1, 2793 sizeof(struct comm_point)); 2794 short evbits; 2795 if(!c) 2796 return NULL; 2797 c->ev = (struct internal_event*)calloc(1, 2798 sizeof(struct internal_event)); 2799 if(!c->ev) { 2800 free(c); 2801 return NULL; 2802 } 2803 c->ev->base = base; 2804 c->fd = -1; 2805 c->buffer = sldns_buffer_new(bufsize); 2806 if(!c->buffer) { 2807 free(c->ev); 2808 free(c); 2809 return NULL; 2810 } 2811 c->timeout = NULL; 2812 c->tcp_is_reading = 0; 2813 c->tcp_byte_count = 0; 2814 c->tcp_timeout_msec = TCP_QUERY_TIMEOUT; 2815 c->tcp_conn_limit = NULL; 2816 c->tcl_addr = NULL; 2817 c->tcp_keepalive = 0; 2818 c->tcp_parent = NULL; 2819 c->max_tcp_count = 0; 2820 c->cur_tcp_count = 0; 2821 c->tcp_handlers = NULL; 2822 c->tcp_free = NULL; 2823 c->type = comm_tcp; 2824 c->tcp_do_close = 0; 2825 c->do_not_close = 0; 2826 c->tcp_do_toggle_rw = 1; 2827 c->tcp_check_nb_connect = 1; 2828 #ifdef USE_MSG_FASTOPEN 2829 c->tcp_do_fastopen = 1; 2830 #endif 2831 #ifdef USE_DNSCRYPT 2832 c->dnscrypt = 0; 2833 c->dnscrypt_buffer = c->buffer; 2834 #endif 2835 c->repinfo.c = c; 2836 c->callback = callback; 2837 c->cb_arg = callback_arg; 2838 evbits = UB_EV_PERSIST | UB_EV_WRITE; 2839 c->ev->ev = ub_event_new(base->eb->base, c->fd, evbits, 2840 comm_point_tcp_handle_callback, c); 2841 if(c->ev->ev == NULL) 2842 { 2843 log_err("could not baseset tcpout event"); 2844 sldns_buffer_free(c->buffer); 2845 free(c->ev); 2846 free(c); 2847 return NULL; 2848 } 2849 2850 return c; 2851 } 2852 2853 struct comm_point* 2854 comm_point_create_http_out(struct comm_base *base, size_t bufsize, 2855 comm_point_callback_type* callback, void* callback_arg, 2856 sldns_buffer* temp) 2857 { 2858 struct comm_point* c = (struct comm_point*)calloc(1, 2859 sizeof(struct comm_point)); 2860 short evbits; 2861 if(!c) 2862 return NULL; 2863 c->ev = (struct internal_event*)calloc(1, 2864 sizeof(struct internal_event)); 2865 if(!c->ev) { 2866 free(c); 2867 return NULL; 2868 } 2869 c->ev->base = base; 2870 c->fd = -1; 2871 c->buffer = sldns_buffer_new(bufsize); 2872 if(!c->buffer) { 2873 free(c->ev); 2874 free(c); 2875 return NULL; 2876 } 2877 c->timeout = NULL; 2878 c->tcp_is_reading = 0; 2879 c->tcp_byte_count = 0; 2880 c->tcp_parent = NULL; 2881 c->max_tcp_count = 0; 2882 c->cur_tcp_count = 0; 2883 c->tcp_handlers = NULL; 2884 c->tcp_free = NULL; 2885 c->type = comm_http; 2886 c->tcp_do_close = 0; 2887 c->do_not_close = 0; 2888 c->tcp_do_toggle_rw = 1; 2889 c->tcp_check_nb_connect = 1; 2890 c->http_in_headers = 1; 2891 c->http_in_chunk_headers = 0; 2892 c->http_is_chunked = 0; 2893 c->http_temp = temp; 2894 #ifdef USE_MSG_FASTOPEN 2895 c->tcp_do_fastopen = 1; 2896 #endif 2897 #ifdef USE_DNSCRYPT 2898 c->dnscrypt = 0; 2899 c->dnscrypt_buffer = c->buffer; 2900 #endif 2901 c->repinfo.c = c; 2902 c->callback = callback; 2903 c->cb_arg = callback_arg; 2904 evbits = UB_EV_PERSIST | UB_EV_WRITE; 2905 c->ev->ev = ub_event_new(base->eb->base, c->fd, evbits, 2906 comm_point_http_handle_callback, c); 2907 if(c->ev->ev == NULL) 2908 { 2909 log_err("could not baseset tcpout event"); 2910 #ifdef HAVE_SSL 2911 SSL_free(c->ssl); 2912 #endif 2913 sldns_buffer_free(c->buffer); 2914 free(c->ev); 2915 free(c); 2916 return NULL; 2917 } 2918 2919 return c; 2920 } 2921 2922 struct comm_point* 2923 comm_point_create_local(struct comm_base *base, int fd, size_t bufsize, 2924 comm_point_callback_type* callback, void* callback_arg) 2925 { 2926 struct comm_point* c = (struct comm_point*)calloc(1, 2927 sizeof(struct comm_point)); 2928 short evbits; 2929 if(!c) 2930 return NULL; 2931 c->ev = (struct internal_event*)calloc(1, 2932 sizeof(struct internal_event)); 2933 if(!c->ev) { 2934 free(c); 2935 return NULL; 2936 } 2937 c->ev->base = base; 2938 c->fd = fd; 2939 c->buffer = sldns_buffer_new(bufsize); 2940 if(!c->buffer) { 2941 free(c->ev); 2942 free(c); 2943 return NULL; 2944 } 2945 c->timeout = NULL; 2946 c->tcp_is_reading = 1; 2947 c->tcp_byte_count = 0; 2948 c->tcp_parent = NULL; 2949 c->max_tcp_count = 0; 2950 c->cur_tcp_count = 0; 2951 c->tcp_handlers = NULL; 2952 c->tcp_free = NULL; 2953 c->type = comm_local; 2954 c->tcp_do_close = 0; 2955 c->do_not_close = 1; 2956 c->tcp_do_toggle_rw = 0; 2957 c->tcp_check_nb_connect = 0; 2958 #ifdef USE_MSG_FASTOPEN 2959 c->tcp_do_fastopen = 0; 2960 #endif 2961 #ifdef USE_DNSCRYPT 2962 c->dnscrypt = 0; 2963 c->dnscrypt_buffer = c->buffer; 2964 #endif 2965 c->callback = callback; 2966 c->cb_arg = callback_arg; 2967 /* ub_event stuff */ 2968 evbits = UB_EV_PERSIST | UB_EV_READ; 2969 c->ev->ev = ub_event_new(base->eb->base, c->fd, evbits, 2970 comm_point_local_handle_callback, c); 2971 if(c->ev->ev == NULL) { 2972 log_err("could not baseset localhdl event"); 2973 free(c->ev); 2974 free(c); 2975 return NULL; 2976 } 2977 if (ub_event_add(c->ev->ev, c->timeout) != 0) { 2978 log_err("could not add localhdl event"); 2979 ub_event_free(c->ev->ev); 2980 free(c->ev); 2981 free(c); 2982 return NULL; 2983 } 2984 return c; 2985 } 2986 2987 struct comm_point* 2988 comm_point_create_raw(struct comm_base* base, int fd, int writing, 2989 comm_point_callback_type* callback, void* callback_arg) 2990 { 2991 struct comm_point* c = (struct comm_point*)calloc(1, 2992 sizeof(struct comm_point)); 2993 short evbits; 2994 if(!c) 2995 return NULL; 2996 c->ev = (struct internal_event*)calloc(1, 2997 sizeof(struct internal_event)); 2998 if(!c->ev) { 2999 free(c); 3000 return NULL; 3001 } 3002 c->ev->base = base; 3003 c->fd = fd; 3004 c->buffer = NULL; 3005 c->timeout = NULL; 3006 c->tcp_is_reading = 0; 3007 c->tcp_byte_count = 0; 3008 c->tcp_parent = NULL; 3009 c->max_tcp_count = 0; 3010 c->cur_tcp_count = 0; 3011 c->tcp_handlers = NULL; 3012 c->tcp_free = NULL; 3013 c->type = comm_raw; 3014 c->tcp_do_close = 0; 3015 c->do_not_close = 1; 3016 c->tcp_do_toggle_rw = 0; 3017 c->tcp_check_nb_connect = 0; 3018 #ifdef USE_MSG_FASTOPEN 3019 c->tcp_do_fastopen = 0; 3020 #endif 3021 #ifdef USE_DNSCRYPT 3022 c->dnscrypt = 0; 3023 c->dnscrypt_buffer = c->buffer; 3024 #endif 3025 c->callback = callback; 3026 c->cb_arg = callback_arg; 3027 /* ub_event stuff */ 3028 if(writing) 3029 evbits = UB_EV_PERSIST | UB_EV_WRITE; 3030 else evbits = UB_EV_PERSIST | UB_EV_READ; 3031 c->ev->ev = ub_event_new(base->eb->base, c->fd, evbits, 3032 comm_point_raw_handle_callback, c); 3033 if(c->ev->ev == NULL) { 3034 log_err("could not baseset rawhdl event"); 3035 free(c->ev); 3036 free(c); 3037 return NULL; 3038 } 3039 if (ub_event_add(c->ev->ev, c->timeout) != 0) { 3040 log_err("could not add rawhdl event"); 3041 ub_event_free(c->ev->ev); 3042 free(c->ev); 3043 free(c); 3044 return NULL; 3045 } 3046 return c; 3047 } 3048 3049 void 3050 comm_point_close(struct comm_point* c) 3051 { 3052 if(!c) 3053 return; 3054 if(c->fd != -1) { 3055 if(ub_event_del(c->ev->ev) != 0) { 3056 log_err("could not event_del on close"); 3057 } 3058 } 3059 tcl_close_connection(c->tcl_addr); 3060 if(c->tcp_req_info) 3061 tcp_req_info_clear(c->tcp_req_info); 3062 /* close fd after removing from event lists, or epoll.. is messed up */ 3063 if(c->fd != -1 && !c->do_not_close) { 3064 if(c->type == comm_tcp || c->type == comm_http) { 3065 /* delete sticky events for the fd, it gets closed */ 3066 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_READ); 3067 ub_winsock_tcp_wouldblock(c->ev->ev, UB_EV_WRITE); 3068 } 3069 verbose(VERB_ALGO, "close fd %d", c->fd); 3070 #ifndef USE_WINSOCK 3071 close(c->fd); 3072 #else 3073 closesocket(c->fd); 3074 #endif 3075 } 3076 c->fd = -1; 3077 } 3078 3079 void 3080 comm_point_delete(struct comm_point* c) 3081 { 3082 if(!c) 3083 return; 3084 if((c->type == comm_tcp || c->type == comm_http) && c->ssl) { 3085 #ifdef HAVE_SSL 3086 SSL_shutdown(c->ssl); 3087 SSL_free(c->ssl); 3088 #endif 3089 } 3090 comm_point_close(c); 3091 if(c->tcp_handlers) { 3092 int i; 3093 for(i=0; i<c->max_tcp_count; i++) 3094 comm_point_delete(c->tcp_handlers[i]); 3095 free(c->tcp_handlers); 3096 } 3097 free(c->timeout); 3098 if(c->type == comm_tcp || c->type == comm_local || c->type == comm_http) { 3099 sldns_buffer_free(c->buffer); 3100 #ifdef USE_DNSCRYPT 3101 if(c->dnscrypt && c->dnscrypt_buffer != c->buffer) { 3102 sldns_buffer_free(c->dnscrypt_buffer); 3103 } 3104 #endif 3105 if(c->tcp_req_info) { 3106 tcp_req_info_delete(c->tcp_req_info); 3107 } 3108 } 3109 ub_event_free(c->ev->ev); 3110 free(c->ev); 3111 free(c); 3112 } 3113 3114 void 3115 comm_point_send_reply(struct comm_reply *repinfo) 3116 { 3117 struct sldns_buffer* buffer; 3118 log_assert(repinfo && repinfo->c); 3119 #ifdef USE_DNSCRYPT 3120 buffer = repinfo->c->dnscrypt_buffer; 3121 if(!dnsc_handle_uncurved_request(repinfo)) { 3122 return; 3123 } 3124 #else 3125 buffer = repinfo->c->buffer; 3126 #endif 3127 if(repinfo->c->type == comm_udp) { 3128 if(repinfo->srctype) 3129 comm_point_send_udp_msg_if(repinfo->c, 3130 buffer, (struct sockaddr*)&repinfo->addr, 3131 repinfo->addrlen, repinfo); 3132 else 3133 comm_point_send_udp_msg(repinfo->c, buffer, 3134 (struct sockaddr*)&repinfo->addr, repinfo->addrlen); 3135 #ifdef USE_DNSTAP 3136 if(repinfo->c->dtenv != NULL && 3137 repinfo->c->dtenv->log_client_response_messages) 3138 dt_msg_send_client_response(repinfo->c->dtenv, 3139 &repinfo->addr, repinfo->c->type, repinfo->c->buffer); 3140 #endif 3141 } else { 3142 #ifdef USE_DNSTAP 3143 if(repinfo->c->tcp_parent->dtenv != NULL && 3144 repinfo->c->tcp_parent->dtenv->log_client_response_messages) 3145 dt_msg_send_client_response(repinfo->c->tcp_parent->dtenv, 3146 &repinfo->addr, repinfo->c->type, repinfo->c->buffer); 3147 #endif 3148 if(repinfo->c->tcp_req_info) { 3149 tcp_req_info_send_reply(repinfo->c->tcp_req_info); 3150 } else { 3151 comm_point_start_listening(repinfo->c, -1, 3152 repinfo->c->tcp_timeout_msec); 3153 } 3154 } 3155 } 3156 3157 void 3158 comm_point_drop_reply(struct comm_reply* repinfo) 3159 { 3160 if(!repinfo) 3161 return; 3162 log_assert(repinfo && repinfo->c); 3163 log_assert(repinfo->c->type != comm_tcp_accept); 3164 if(repinfo->c->type == comm_udp) 3165 return; 3166 if(repinfo->c->tcp_req_info) 3167 repinfo->c->tcp_req_info->is_drop = 1; 3168 reclaim_tcp_handler(repinfo->c); 3169 } 3170 3171 void 3172 comm_point_stop_listening(struct comm_point* c) 3173 { 3174 verbose(VERB_ALGO, "comm point stop listening %d", c->fd); 3175 if(ub_event_del(c->ev->ev) != 0) { 3176 log_err("event_del error to stoplisten"); 3177 } 3178 } 3179 3180 void 3181 comm_point_start_listening(struct comm_point* c, int newfd, int msec) 3182 { 3183 verbose(VERB_ALGO, "comm point start listening %d (%d msec)", 3184 c->fd==-1?newfd:c->fd, msec); 3185 if(c->type == comm_tcp_accept && !c->tcp_free) { 3186 /* no use to start listening no free slots. */ 3187 return; 3188 } 3189 if(msec != -1 && msec != 0) { 3190 if(!c->timeout) { 3191 c->timeout = (struct timeval*)malloc(sizeof( 3192 struct timeval)); 3193 if(!c->timeout) { 3194 log_err("cpsl: malloc failed. No net read."); 3195 return; 3196 } 3197 } 3198 ub_event_add_bits(c->ev->ev, UB_EV_TIMEOUT); 3199 #ifndef S_SPLINT_S /* splint fails on struct timeval. */ 3200 c->timeout->tv_sec = msec/1000; 3201 c->timeout->tv_usec = (msec%1000)*1000; 3202 #endif /* S_SPLINT_S */ 3203 } 3204 if(c->type == comm_tcp || c->type == comm_http) { 3205 ub_event_del_bits(c->ev->ev, UB_EV_READ|UB_EV_WRITE); 3206 if(c->tcp_is_reading) 3207 ub_event_add_bits(c->ev->ev, UB_EV_READ); 3208 else ub_event_add_bits(c->ev->ev, UB_EV_WRITE); 3209 } 3210 if(newfd != -1) { 3211 if(c->fd != -1) { 3212 #ifndef USE_WINSOCK 3213 close(c->fd); 3214 #else 3215 closesocket(c->fd); 3216 #endif 3217 } 3218 c->fd = newfd; 3219 ub_event_set_fd(c->ev->ev, c->fd); 3220 } 3221 if(ub_event_add(c->ev->ev, msec==0?NULL:c->timeout) != 0) { 3222 log_err("event_add failed. in cpsl."); 3223 } 3224 } 3225 3226 void comm_point_listen_for_rw(struct comm_point* c, int rd, int wr) 3227 { 3228 verbose(VERB_ALGO, "comm point listen_for_rw %d %d", c->fd, wr); 3229 if(ub_event_del(c->ev->ev) != 0) { 3230 log_err("event_del error to cplf"); 3231 } 3232 ub_event_del_bits(c->ev->ev, UB_EV_READ|UB_EV_WRITE); 3233 if(rd) ub_event_add_bits(c->ev->ev, UB_EV_READ); 3234 if(wr) ub_event_add_bits(c->ev->ev, UB_EV_WRITE); 3235 if(ub_event_add(c->ev->ev, c->timeout) != 0) { 3236 log_err("event_add failed. in cplf."); 3237 } 3238 } 3239 3240 size_t comm_point_get_mem(struct comm_point* c) 3241 { 3242 size_t s; 3243 if(!c) 3244 return 0; 3245 s = sizeof(*c) + sizeof(*c->ev); 3246 if(c->timeout) 3247 s += sizeof(*c->timeout); 3248 if(c->type == comm_tcp || c->type == comm_local) { 3249 s += sizeof(*c->buffer) + sldns_buffer_capacity(c->buffer); 3250 #ifdef USE_DNSCRYPT 3251 s += sizeof(*c->dnscrypt_buffer); 3252 if(c->buffer != c->dnscrypt_buffer) { 3253 s += sldns_buffer_capacity(c->dnscrypt_buffer); 3254 } 3255 #endif 3256 } 3257 if(c->type == comm_tcp_accept) { 3258 int i; 3259 for(i=0; i<c->max_tcp_count; i++) 3260 s += comm_point_get_mem(c->tcp_handlers[i]); 3261 } 3262 return s; 3263 } 3264 3265 struct comm_timer* 3266 comm_timer_create(struct comm_base* base, void (*cb)(void*), void* cb_arg) 3267 { 3268 struct internal_timer *tm = (struct internal_timer*)calloc(1, 3269 sizeof(struct internal_timer)); 3270 if(!tm) { 3271 log_err("malloc failed"); 3272 return NULL; 3273 } 3274 tm->super.ev_timer = tm; 3275 tm->base = base; 3276 tm->super.callback = cb; 3277 tm->super.cb_arg = cb_arg; 3278 tm->ev = ub_event_new(base->eb->base, -1, UB_EV_TIMEOUT, 3279 comm_timer_callback, &tm->super); 3280 if(tm->ev == NULL) { 3281 log_err("timer_create: event_base_set failed."); 3282 free(tm); 3283 return NULL; 3284 } 3285 return &tm->super; 3286 } 3287 3288 void 3289 comm_timer_disable(struct comm_timer* timer) 3290 { 3291 if(!timer) 3292 return; 3293 ub_timer_del(timer->ev_timer->ev); 3294 timer->ev_timer->enabled = 0; 3295 } 3296 3297 void 3298 comm_timer_set(struct comm_timer* timer, struct timeval* tv) 3299 { 3300 log_assert(tv); 3301 if(timer->ev_timer->enabled) 3302 comm_timer_disable(timer); 3303 if(ub_timer_add(timer->ev_timer->ev, timer->ev_timer->base->eb->base, 3304 comm_timer_callback, timer, tv) != 0) 3305 log_err("comm_timer_set: evtimer_add failed."); 3306 timer->ev_timer->enabled = 1; 3307 } 3308 3309 void 3310 comm_timer_delete(struct comm_timer* timer) 3311 { 3312 if(!timer) 3313 return; 3314 comm_timer_disable(timer); 3315 /* Free the sub struct timer->ev_timer derived from the super struct timer. 3316 * i.e. assert(timer == timer->ev_timer) 3317 */ 3318 ub_event_free(timer->ev_timer->ev); 3319 free(timer->ev_timer); 3320 } 3321 3322 void 3323 comm_timer_callback(int ATTR_UNUSED(fd), short event, void* arg) 3324 { 3325 struct comm_timer* tm = (struct comm_timer*)arg; 3326 if(!(event&UB_EV_TIMEOUT)) 3327 return; 3328 ub_comm_base_now(tm->ev_timer->base); 3329 tm->ev_timer->enabled = 0; 3330 fptr_ok(fptr_whitelist_comm_timer(tm->callback)); 3331 (*tm->callback)(tm->cb_arg); 3332 } 3333 3334 int 3335 comm_timer_is_set(struct comm_timer* timer) 3336 { 3337 return (int)timer->ev_timer->enabled; 3338 } 3339 3340 size_t 3341 comm_timer_get_mem(struct comm_timer* ATTR_UNUSED(timer)) 3342 { 3343 return sizeof(struct internal_timer); 3344 } 3345 3346 struct comm_signal* 3347 comm_signal_create(struct comm_base* base, 3348 void (*callback)(int, void*), void* cb_arg) 3349 { 3350 struct comm_signal* com = (struct comm_signal*)malloc( 3351 sizeof(struct comm_signal)); 3352 if(!com) { 3353 log_err("malloc failed"); 3354 return NULL; 3355 } 3356 com->base = base; 3357 com->callback = callback; 3358 com->cb_arg = cb_arg; 3359 com->ev_signal = NULL; 3360 return com; 3361 } 3362 3363 void 3364 comm_signal_callback(int sig, short event, void* arg) 3365 { 3366 struct comm_signal* comsig = (struct comm_signal*)arg; 3367 if(!(event & UB_EV_SIGNAL)) 3368 return; 3369 ub_comm_base_now(comsig->base); 3370 fptr_ok(fptr_whitelist_comm_signal(comsig->callback)); 3371 (*comsig->callback)(sig, comsig->cb_arg); 3372 } 3373 3374 int 3375 comm_signal_bind(struct comm_signal* comsig, int sig) 3376 { 3377 struct internal_signal* entry = (struct internal_signal*)calloc(1, 3378 sizeof(struct internal_signal)); 3379 if(!entry) { 3380 log_err("malloc failed"); 3381 return 0; 3382 } 3383 log_assert(comsig); 3384 /* add signal event */ 3385 entry->ev = ub_signal_new(comsig->base->eb->base, sig, 3386 comm_signal_callback, comsig); 3387 if(entry->ev == NULL) { 3388 log_err("Could not create signal event"); 3389 free(entry); 3390 return 0; 3391 } 3392 if(ub_signal_add(entry->ev, NULL) != 0) { 3393 log_err("Could not add signal handler"); 3394 ub_event_free(entry->ev); 3395 free(entry); 3396 return 0; 3397 } 3398 /* link into list */ 3399 entry->next = comsig->ev_signal; 3400 comsig->ev_signal = entry; 3401 return 1; 3402 } 3403 3404 void 3405 comm_signal_delete(struct comm_signal* comsig) 3406 { 3407 struct internal_signal* p, *np; 3408 if(!comsig) 3409 return; 3410 p=comsig->ev_signal; 3411 while(p) { 3412 np = p->next; 3413 ub_signal_del(p->ev); 3414 ub_event_free(p->ev); 3415 free(p); 3416 p = np; 3417 } 3418 free(comsig); 3419 } 3420