contrib/unbound/services/listen_dnsport.c

   1 /*
   2  * services/listen_dnsport.c - listen on port 53 for incoming DNS queries.
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file has functions to get queries from clients.
  40  */
  41 #include "config.h"
  42 #ifdef HAVE_SYS_TYPES_H
  43 #  include <sys/types.h>
  44 #endif
  45 #include <sys/time.h>
  46 #ifdef USE_TCP_FASTOPEN
  47 #include <netinet/tcp.h>
  48 #endif
  49 #include "services/listen_dnsport.h"
  50 #include "services/outside_network.h"
  51 #include "util/netevent.h"
  52 #include "util/log.h"
  53 #include "util/config_file.h"
  54 #include "util/net_help.h"
  55 #include "sldns/sbuffer.h"
  56
  57 #ifdef HAVE_NETDB_H
  58 #include <netdb.h>
  59 #endif
  60 #include <fcntl.h>
  61
  62 #ifdef HAVE_SYS_UN_H
  63 #include <sys/un.h>
  64 #endif
  65
  66 #ifdef HAVE_SYSTEMD
  67 #include <systemd/sd-daemon.h>
  68 #endif
  69
  70 /** number of queued TCP connections for listen() */
  71 #define TCP_BACKLOG 256
  72
  73 /**
  74  * Debug print of the getaddrinfo returned address.
  75  * @param addr: the address returned.
  76  */
  77 static void
  78 verbose_print_addr(struct addrinfo *addr)
  79 {
  80         if(verbosity >= VERB_ALGO) {
  81                 char buf[100];
  82                 void* sinaddr = &((struct sockaddr_in*)addr->ai_addr)->sin_addr;
  83 #ifdef INET6
  84                 if(addr->ai_family == AF_INET6)
  85                         sinaddr = &((struct sockaddr_in6*)addr->ai_addr)->
  86                                 sin6_addr;
  87 #endif /* INET6 */
  88                 if(inet_ntop(addr->ai_family, sinaddr, buf,
  89                         (socklen_t)sizeof(buf)) == 0) {
  90                         (void)strlcpy(buf, "(null)", sizeof(buf));
  91                 }
  92                 buf[sizeof(buf)-1] = 0;
  93                 verbose(VERB_ALGO, "creating %s%s socket %s %d",
  94                         addr->ai_socktype==SOCK_DGRAM?"udp":
  95                         addr->ai_socktype==SOCK_STREAM?"tcp":"otherproto",
  96                         addr->ai_family==AF_INET?"4":
  97                         addr->ai_family==AF_INET6?"6":
  98                         "_otherfam", buf,
  99                         ntohs(((struct sockaddr_in*)addr->ai_addr)->sin_port));
 100         }
 101 }
 102
 103 #ifdef HAVE_SYSTEMD
 104 static int
 105 systemd_get_activated(int family, int socktype, int listen,
 106                       struct sockaddr *addr, socklen_t addrlen,
 107                       const char *path)
 108 {
 109         int i = 0;
 110         int r = 0;
 111         int s = -1;
 112         const char* listen_pid, *listen_fds;
 113
 114         /* We should use "listen" option only for stream protocols. For UDP it should be -1 */
 115
 116         if((r = sd_booted()) < 1) {
 117                 if(r == 0)
 118                         log_warn("systemd is not running");
 119                 else
 120                         log_err("systemd sd_booted(): %s", strerror(-r));
 121                 return -1;
 122         }
 123
 124         listen_pid = getenv("LISTEN_PID");
 125         listen_fds = getenv("LISTEN_FDS");
 126
 127         if (!listen_pid) {
 128                 log_warn("Systemd mandatory ENV variable is not defined: LISTEN_PID");
 129                 return -1;
 130         }
 131
 132         if (!listen_fds) {
 133                 log_warn("Systemd mandatory ENV variable is not defined: LISTEN_FDS");
 134                 return -1;
 135         }
 136
 137         if((r = sd_listen_fds(0)) < 1) {
 138                 if(r == 0)
 139                         log_warn("systemd: did not return socket, check unit configuration");
 140                 else
 141                         log_err("systemd sd_listen_fds(): %s", strerror(-r));
 142                 return -1;
 143         }
 144
 145         for(i = 0; i < r; i++) {
 146                 if(sd_is_socket(SD_LISTEN_FDS_START + i, family, socktype, listen)) {
 147                         s = SD_LISTEN_FDS_START + i;
 148                         break;
 149                 }
 150         }
 151         if (s == -1) {
 152                 if (addr)
 153                         log_err_addr("systemd sd_listen_fds()",
 154                                      "no such socket",
 155                                      (struct sockaddr_storage *)addr, addrlen);
 156                 else
 157                         log_err("systemd sd_listen_fds(): %s", path);
 158         }
 159         return s;
 160 }
 161 #endif
 162
 163 int
 164 create_udp_sock(int family, int socktype, struct sockaddr* addr,
 165         socklen_t addrlen, int v6only, int* inuse, int* noproto,
 166         int rcv, int snd, int listen, int* reuseport, int transparent,
 167         int freebind, int use_systemd)
 168 {
 169         int s;
 170 #if defined(SO_REUSEADDR) || defined(SO_REUSEPORT) || defined(IPV6_USE_MIN_MTU)  || defined(IP_TRANSPARENT) || defined(IP_BINDANY) || defined(IP_FREEBIND)
 171         int on=1;
 172 #endif
 173 #ifdef IPV6_MTU
 174         int mtu = IPV6_MIN_MTU;
 175 #endif
 176 #if !defined(SO_RCVBUFFORCE) && !defined(SO_RCVBUF)
 177         (void)rcv;
 178 #endif
 179 #if !defined(SO_SNDBUFFORCE) && !defined(SO_SNDBUF)
 180         (void)snd;
 181 #endif
 182 #ifndef IPV6_V6ONLY
 183         (void)v6only;
 184 #endif
 185 #if !defined(IP_TRANSPARENT) && !defined(IP_BINDANY)
 186         (void)transparent;
 187 #endif
 188 #if !defined(IP_FREEBIND)
 189         (void)freebind;
 190 #endif
 191 #ifdef HAVE_SYSTEMD
 192         int got_fd_from_systemd = 0;
 193
 194         if (!use_systemd
 195             || (use_systemd
 196                 && (s = systemd_get_activated(family, socktype, -1, addr,
 197                                               addrlen, NULL)) == -1)) {
 198 #else
 199         (void)use_systemd;
 200 #endif
 201         if((s = socket(family, socktype, 0)) == -1) {
 202                 *inuse = 0;
 203 #ifndef USE_WINSOCK
 204                 if(errno == EAFNOSUPPORT || errno == EPROTONOSUPPORT) {
 205                         *noproto = 1;
 206                         return -1;
 207                 }
 208                 log_err("can't create socket: %s", strerror(errno));
 209 #else
 210                 if(WSAGetLastError() == WSAEAFNOSUPPORT ||
 211                         WSAGetLastError() == WSAEPROTONOSUPPORT) {
 212                         *noproto = 1;
 213                         return -1;
 214                 }
 215                 log_err("can't create socket: %s",
 216                         wsa_strerror(WSAGetLastError()));
 217 #endif
 218                 *noproto = 0;
 219                 return -1;
 220         }
 221 #ifdef HAVE_SYSTEMD
 222         } else {
 223                 got_fd_from_systemd = 1;
 224         }
 225 #endif
 226         if(listen) {
 227 #ifdef SO_REUSEADDR
 228                 if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*)&on,
 229                         (socklen_t)sizeof(on)) < 0) {
 230 #ifndef USE_WINSOCK
 231                         log_err("setsockopt(.. SO_REUSEADDR ..) failed: %s",
 232                                 strerror(errno));
 233                         if(errno != ENOSYS) {
 234                                 close(s);
 235                                 *noproto = 0;
 236                                 *inuse = 0;
 237                                 return -1;
 238                         }
 239 #else
 240                         log_err("setsockopt(.. SO_REUSEADDR ..) failed: %s",
 241                                 wsa_strerror(WSAGetLastError()));
 242                         closesocket(s);
 243                         *noproto = 0;
 244                         *inuse = 0;
 245                         return -1;
 246 #endif
 247                 }
 248 #endif /* SO_REUSEADDR */
 249 #ifdef SO_REUSEPORT
 250                 /* try to set SO_REUSEPORT so that incoming
 251                  * queries are distributed evenly among the receiving threads.
 252                  * Each thread must have its own socket bound to the same port,
 253                  * with SO_REUSEPORT set on each socket.
 254                  */
 255                 if (reuseport && *reuseport &&
 256                     setsockopt(s, SOL_SOCKET, SO_REUSEPORT, (void*)&on,
 257                         (socklen_t)sizeof(on)) < 0) {
 258 #ifdef ENOPROTOOPT
 259                         if(errno != ENOPROTOOPT || verbosity >= 3)
 260                                 log_warn("setsockopt(.. SO_REUSEPORT ..) failed: %s",
 261                                         strerror(errno));
 262 #endif
 263                         /* this option is not essential, we can continue */
 264                         *reuseport = 0;
 265                 }
 266 #else
 267                 (void)reuseport;
 268 #endif /* defined(SO_REUSEPORT) */
 269 #ifdef IP_TRANSPARENT
 270                 if (transparent &&
 271                     setsockopt(s, IPPROTO_IP, IP_TRANSPARENT, (void*)&on,
 272                     (socklen_t)sizeof(on)) < 0) {
 273                         log_warn("setsockopt(.. IP_TRANSPARENT ..) failed: %s",
 274                         strerror(errno));
 275                 }
 276 #elif defined(IP_BINDANY)
 277                 if (transparent &&
 278                     setsockopt(s, (family==AF_INET6? IPPROTO_IPV6:IPPROTO_IP),
 279                     (family == AF_INET6? IPV6_BINDANY:IP_BINDANY),
 280                     (void*)&on, (socklen_t)sizeof(on)) < 0) {
 281                         log_warn("setsockopt(.. IP%s_BINDANY ..) failed: %s",
 282                         (family==AF_INET6?"V6":""), strerror(errno));
 283                 }
 284 #endif /* IP_TRANSPARENT || IP_BINDANY */
 285         }
 286 #ifdef IP_FREEBIND
 287         if(freebind &&
 288             setsockopt(s, IPPROTO_IP, IP_FREEBIND, (void*)&on,
 289             (socklen_t)sizeof(on)) < 0) {
 290                 log_warn("setsockopt(.. IP_FREEBIND ..) failed: %s",
 291                 strerror(errno));
 292         }
 293 #endif /* IP_FREEBIND */
 294         if(rcv) {
 295 #ifdef SO_RCVBUF
 296                 int got;
 297                 socklen_t slen = (socklen_t)sizeof(got);
 298 #  ifdef SO_RCVBUFFORCE
 299                 /* Linux specific: try to use root permission to override
 300                  * system limits on rcvbuf. The limit is stored in
 301                  * /proc/sys/net/core/rmem_max or sysctl net.core.rmem_max */
 302                 if(setsockopt(s, SOL_SOCKET, SO_RCVBUFFORCE, (void*)&rcv,
 303                         (socklen_t)sizeof(rcv)) < 0) {
 304                         if(errno != EPERM) {
 305 #    ifndef USE_WINSOCK
 306                                 log_err("setsockopt(..., SO_RCVBUFFORCE, "
 307                                         "...) failed: %s", strerror(errno));
 308                                 close(s);
 309 #    else
 310                                 log_err("setsockopt(..., SO_RCVBUFFORCE, "
 311                                         "...) failed: %s",
 312                                         wsa_strerror(WSAGetLastError()));
 313                                 closesocket(s);
 314 #    endif
 315                                 *noproto = 0;
 316                                 *inuse = 0;
 317                                 return -1;
 318                         }
 319 #  endif /* SO_RCVBUFFORCE */
 320                         if(setsockopt(s, SOL_SOCKET, SO_RCVBUF, (void*)&rcv,
 321                                 (socklen_t)sizeof(rcv)) < 0) {
 322 #  ifndef USE_WINSOCK
 323                                 log_err("setsockopt(..., SO_RCVBUF, "
 324                                         "...) failed: %s", strerror(errno));
 325                                 close(s);
 326 #  else
 327                                 log_err("setsockopt(..., SO_RCVBUF, "
 328                                         "...) failed: %s",
 329                                         wsa_strerror(WSAGetLastError()));
 330                                 closesocket(s);
 331 #  endif
 332                                 *noproto = 0;
 333                                 *inuse = 0;
 334                                 return -1;
 335                         }
 336                         /* check if we got the right thing or if system
 337                          * reduced to some system max.  Warn if so */
 338                         if(getsockopt(s, SOL_SOCKET, SO_RCVBUF, (void*)&got,
 339                                 &slen) >= 0 && got < rcv/2) {
 340                                 log_warn("so-rcvbuf %u was not granted. "
 341                                         "Got %u. To fix: start with "
 342                                         "root permissions(linux) or sysctl "
 343                                         "bigger net.core.rmem_max(linux) or "
 344                                         "kern.ipc.maxsockbuf(bsd) values.",
 345                                         (unsigned)rcv, (unsigned)got);
 346                         }
 347 #  ifdef SO_RCVBUFFORCE
 348                 }
 349 #  endif
 350 #endif /* SO_RCVBUF */
 351         }
 352         /* first do RCVBUF as the receive buffer is more important */
 353         if(snd) {
 354 #ifdef SO_SNDBUF
 355                 int got;
 356                 socklen_t slen = (socklen_t)sizeof(got);
 357 #  ifdef SO_SNDBUFFORCE
 358                 /* Linux specific: try to use root permission to override
 359                  * system limits on sndbuf. The limit is stored in
 360                  * /proc/sys/net/core/wmem_max or sysctl net.core.wmem_max */
 361                 if(setsockopt(s, SOL_SOCKET, SO_SNDBUFFORCE, (void*)&snd,
 362                         (socklen_t)sizeof(snd)) < 0) {
 363                         if(errno != EPERM) {
 364 #    ifndef USE_WINSOCK
 365                                 log_err("setsockopt(..., SO_SNDBUFFORCE, "
 366                                         "...) failed: %s", strerror(errno));
 367                                 close(s);
 368 #    else
 369                                 log_err("setsockopt(..., SO_SNDBUFFORCE, "
 370                                         "...) failed: %s",
 371                                         wsa_strerror(WSAGetLastError()));
 372                                 closesocket(s);
 373 #    endif
 374                                 *noproto = 0;
 375                                 *inuse = 0;
 376                                 return -1;
 377                         }
 378 #  endif /* SO_SNDBUFFORCE */
 379                         if(setsockopt(s, SOL_SOCKET, SO_SNDBUF, (void*)&snd,
 380                                 (socklen_t)sizeof(snd)) < 0) {
 381 #  ifndef USE_WINSOCK
 382                                 log_err("setsockopt(..., SO_SNDBUF, "
 383                                         "...) failed: %s", strerror(errno));
 384                                 close(s);
 385 #  else
 386                                 log_err("setsockopt(..., SO_SNDBUF, "
 387                                         "...) failed: %s",
 388                                         wsa_strerror(WSAGetLastError()));
 389                                 closesocket(s);
 390 #  endif
 391                                 *noproto = 0;
 392                                 *inuse = 0;
 393                                 return -1;
 394                         }
 395                         /* check if we got the right thing or if system
 396                          * reduced to some system max.  Warn if so */
 397                         if(getsockopt(s, SOL_SOCKET, SO_SNDBUF, (void*)&got,
 398                                 &slen) >= 0 && got < snd/2) {
 399                                 log_warn("so-sndbuf %u was not granted. "
 400                                         "Got %u. To fix: start with "
 401                                         "root permissions(linux) or sysctl "
 402                                         "bigger net.core.wmem_max(linux) or "
 403                                         "kern.ipc.maxsockbuf(bsd) values.",
 404                                         (unsigned)snd, (unsigned)got);
 405                         }
 406 #  ifdef SO_SNDBUFFORCE
 407                 }
 408 #  endif
 409 #endif /* SO_SNDBUF */
 410         }
 411         if(family == AF_INET6) {
 412 # if defined(IPV6_V6ONLY)
 413                 if(v6only) {
 414                         int val=(v6only==2)?0:1;
 415                         if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
 416                                 (void*)&val, (socklen_t)sizeof(val)) < 0) {
 417 #ifndef USE_WINSOCK
 418                                 log_err("setsockopt(..., IPV6_V6ONLY"
 419                                         ", ...) failed: %s", strerror(errno));
 420                                 close(s);
 421 #else
 422                                 log_err("setsockopt(..., IPV6_V6ONLY"
 423                                         ", ...) failed: %s",
 424                                         wsa_strerror(WSAGetLastError()));
 425                                 closesocket(s);
 426 #endif
 427                                 *noproto = 0;
 428                                 *inuse = 0;
 429                                 return -1;
 430                         }
 431                 }
 432 # endif
 433 # if defined(IPV6_USE_MIN_MTU)
 434                 /*
 435                  * There is no fragmentation of IPv6 datagrams
 436                  * during forwarding in the network. Therefore
 437                  * we do not send UDP datagrams larger than
 438                  * the minimum IPv6 MTU of 1280 octets. The
 439                  * EDNS0 message length can be larger if the
 440                  * network stack supports IPV6_USE_MIN_MTU.
 441                  */
 442                 if (setsockopt(s, IPPROTO_IPV6, IPV6_USE_MIN_MTU,
 443                         (void*)&on, (socklen_t)sizeof(on)) < 0) {
 444 #  ifndef USE_WINSOCK
 445                         log_err("setsockopt(..., IPV6_USE_MIN_MTU, "
 446                                 "...) failed: %s", strerror(errno));
 447                         close(s);
 448 #  else
 449                         log_err("setsockopt(..., IPV6_USE_MIN_MTU, "
 450                                 "...) failed: %s",
 451                                 wsa_strerror(WSAGetLastError()));
 452                         closesocket(s);
 453 #  endif
 454                         *noproto = 0;
 455                         *inuse = 0;
 456                         return -1;
 457                 }
 458 # elif defined(IPV6_MTU)
 459                 /*
 460                  * On Linux, to send no larger than 1280, the PMTUD is
 461                  * disabled by default for datagrams anyway, so we set
 462                  * the MTU to use.
 463                  */
 464                 if (setsockopt(s, IPPROTO_IPV6, IPV6_MTU,
 465                         (void*)&mtu, (socklen_t)sizeof(mtu)) < 0) {
 466 #  ifndef USE_WINSOCK
 467                         log_err("setsockopt(..., IPV6_MTU, ...) failed: %s",
 468                                 strerror(errno));
 469                         close(s);
 470 #  else
 471                         log_err("setsockopt(..., IPV6_MTU, ...) failed: %s",
 472                                 wsa_strerror(WSAGetLastError()));
 473                         closesocket(s);
 474 #  endif
 475                         *noproto = 0;
 476                         *inuse = 0;
 477                         return -1;
 478                 }
 479 # endif /* IPv6 MTU */
 480         } else if(family == AF_INET) {
 481 #  if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
 482 /* linux 3.15 has IP_PMTUDISC_OMIT, Hannes Frederic Sowa made it so that
 483  * PMTU information is not accepted, but fragmentation is allowed
 484  * if and only if the packet size exceeds the outgoing interface MTU
 485  * (and also uses the interface mtu to determine the size of the packets).
 486  * So there won't be any EMSGSIZE error.  Against DNS fragmentation attacks.
 487  * FreeBSD already has same semantics without setting the option. */
 488                 int omit_set = 0;
 489                 int action;
 490 #   if defined(IP_PMTUDISC_OMIT)
 491                 action = IP_PMTUDISC_OMIT;
 492                 if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER,
 493                         &action, (socklen_t)sizeof(action)) < 0) {
 494
 495                         if (errno != EINVAL) {
 496                                 log_err("setsockopt(..., IP_MTU_DISCOVER, IP_PMTUDISC_OMIT...) failed: %s",
 497                                         strerror(errno));
 498
 499 #    ifndef USE_WINSOCK
 500                                 close(s);
 501 #    else
 502                                 closesocket(s);
 503 #    endif
 504                                 *noproto = 0;
 505                                 *inuse = 0;
 506                                 return -1;
 507                         }
 508                 }
 509                 else
 510                 {
 511                     omit_set = 1;
 512                 }
 513 #   endif
 514                 if (omit_set == 0) {
 515                         action = IP_PMTUDISC_DONT;
 516                         if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER,
 517                                 &action, (socklen_t)sizeof(action)) < 0) {
 518                                 log_err("setsockopt(..., IP_MTU_DISCOVER, IP_PMTUDISC_DONT...) failed: %s",
 519                                         strerror(errno));
 520 #    ifndef USE_WINSOCK
 521                                 close(s);
 522 #    else
 523                                 closesocket(s);
 524 #    endif
 525                                 *noproto = 0;
 526                                 *inuse = 0;
 527                                 return -1;
 528                         }
 529                 }
 530 #  elif defined(IP_DONTFRAG)
 531                 int off = 0;
 532                 if (setsockopt(s, IPPROTO_IP, IP_DONTFRAG,
 533                         &off, (socklen_t)sizeof(off)) < 0) {
 534                         log_err("setsockopt(..., IP_DONTFRAG, ...) failed: %s",
 535                                 strerror(errno));
 536 #    ifndef USE_WINSOCK
 537                         close(s);
 538 #    else
 539                         closesocket(s);
 540 #    endif
 541                         *noproto = 0;
 542                         *inuse = 0;
 543                         return -1;
 544                 }
 545 #  endif /* IPv4 MTU */
 546         }
 547         if(
 548 #ifdef HAVE_SYSTEMD
 549                 !got_fd_from_systemd &&
 550 #endif
 551                 bind(s, (struct sockaddr*)addr, addrlen) != 0) {
 552                 *noproto = 0;
 553                 *inuse = 0;
 554 #ifndef USE_WINSOCK
 555 #ifdef EADDRINUSE
 556                 *inuse = (errno == EADDRINUSE);
 557                 /* detect freebsd jail with no ipv6 permission */
 558                 if(family==AF_INET6 && errno==EINVAL)
 559                         *noproto = 1;
 560                 else if(errno != EADDRINUSE) {
 561                         log_err_addr("can't bind socket", strerror(errno),
 562                                 (struct sockaddr_storage*)addr, addrlen);
 563                 }
 564 #endif /* EADDRINUSE */
 565                 close(s);
 566 #else /* USE_WINSOCK */
 567                 if(WSAGetLastError() != WSAEADDRINUSE &&
 568                         WSAGetLastError() != WSAEADDRNOTAVAIL) {
 569                         log_err_addr("can't bind socket",
 570                                 wsa_strerror(WSAGetLastError()),
 571                                 (struct sockaddr_storage*)addr, addrlen);
 572                 }
 573                 closesocket(s);
 574 #endif /* USE_WINSOCK */
 575                 return -1;
 576         }
 577         if(!fd_set_nonblock(s)) {
 578                 *noproto = 0;
 579                 *inuse = 0;
 580 #ifndef USE_WINSOCK
 581                 close(s);
 582 #else
 583                 closesocket(s);
 584 #endif
 585                 return -1;
 586         }
 587         return s;
 588 }
 589
 590 int
 591 create_tcp_accept_sock(struct addrinfo *addr, int v6only, int* noproto,
 592         int* reuseport, int transparent, int mss, int freebind, int use_systemd)
 593 {
 594         int s;
 595 #if defined(SO_REUSEADDR) || defined(SO_REUSEPORT) || defined(IPV6_V6ONLY) || defined(IP_TRANSPARENT) || defined(IP_BINDANY) || defined(IP_FREEBIND)
 596         int on = 1;
 597 #endif
 598 #ifdef HAVE_SYSTEMD
 599         int got_fd_from_systemd = 0;
 600 #endif
 601 #ifdef USE_TCP_FASTOPEN
 602         int qlen;
 603 #endif
 604 #if !defined(IP_TRANSPARENT) && !defined(IP_BINDANY)
 605         (void)transparent;
 606 #endif
 607 #if !defined(IP_FREEBIND)
 608         (void)freebind;
 609 #endif
 610         verbose_print_addr(addr);
 611         *noproto = 0;
 612 #ifdef HAVE_SYSTEMD
 613         if (!use_systemd ||
 614             (use_systemd
 615              && (s = systemd_get_activated(addr->ai_family, addr->ai_socktype, 1,
 616                                            addr->ai_addr, addr->ai_addrlen,
 617                                            NULL)) == -1)) {
 618 #else
 619         (void)use_systemd;
 620 #endif
 621         if((s = socket(addr->ai_family, addr->ai_socktype, 0)) == -1) {
 622 #ifndef USE_WINSOCK
 623                 if(errno == EAFNOSUPPORT || errno == EPROTONOSUPPORT) {
 624                         *noproto = 1;
 625                         return -1;
 626                 }
 627                 log_err("can't create socket: %s", strerror(errno));
 628 #else
 629                 if(WSAGetLastError() == WSAEAFNOSUPPORT ||
 630                         WSAGetLastError() == WSAEPROTONOSUPPORT) {
 631                         *noproto = 1;
 632                         return -1;
 633                 }
 634                 log_err("can't create socket: %s",
 635                         wsa_strerror(WSAGetLastError()));
 636 #endif
 637                 return -1;
 638         }
 639         if (mss > 0) {
 640 #if defined(IPPROTO_TCP) && defined(TCP_MAXSEG)
 641                 if(setsockopt(s, IPPROTO_TCP, TCP_MAXSEG, (void*)&mss,
 642                         (socklen_t)sizeof(mss)) < 0) {
 643                         #ifndef USE_WINSOCK
 644                         log_err(" setsockopt(.. TCP_MAXSEG ..) failed: %s",
 645                                 strerror(errno));
 646                         #else
 647                         log_err(" setsockopt(.. TCP_MAXSEG ..) failed: %s",
 648                                 wsa_strerror(WSAGetLastError()));
 649                         #endif
 650                 } else {
 651                         verbose(VERB_ALGO,
 652                                 " tcp socket mss set to %d", mss);
 653                 }
 654 #else
 655                 log_warn(" setsockopt(TCP_MAXSEG) unsupported");
 656 #endif /* defined(IPPROTO_TCP) && defined(TCP_MAXSEG) */
 657         }
 658 #ifdef HAVE_SYSTEMD
 659         } else {
 660                 got_fd_from_systemd = 1;
 661     }
 662 #endif
 663 #ifdef SO_REUSEADDR
 664         if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*)&on,
 665                 (socklen_t)sizeof(on)) < 0) {
 666 #ifndef USE_WINSOCK
 667                 log_err("setsockopt(.. SO_REUSEADDR ..) failed: %s",
 668                         strerror(errno));
 669                 close(s);
 670 #else
 671                 log_err("setsockopt(.. SO_REUSEADDR ..) failed: %s",
 672                         wsa_strerror(WSAGetLastError()));
 673                 closesocket(s);
 674 #endif
 675                 return -1;
 676         }
 677 #endif /* SO_REUSEADDR */
 678 #ifdef IP_FREEBIND
 679         if (freebind && setsockopt(s, IPPROTO_IP, IP_FREEBIND, (void*)&on,
 680             (socklen_t)sizeof(on)) < 0) {
 681                 log_warn("setsockopt(.. IP_FREEBIND ..) failed: %s",
 682                 strerror(errno));
 683         }
 684 #endif /* IP_FREEBIND */
 685 #ifdef SO_REUSEPORT
 686         /* try to set SO_REUSEPORT so that incoming
 687          * connections are distributed evenly among the receiving threads.
 688          * Each thread must have its own socket bound to the same port,
 689          * with SO_REUSEPORT set on each socket.
 690          */
 691         if (reuseport && *reuseport &&
 692                 setsockopt(s, SOL_SOCKET, SO_REUSEPORT, (void*)&on,
 693                 (socklen_t)sizeof(on)) < 0) {
 694 #ifdef ENOPROTOOPT
 695                 if(errno != ENOPROTOOPT || verbosity >= 3)
 696                         log_warn("setsockopt(.. SO_REUSEPORT ..) failed: %s",
 697                                 strerror(errno));
 698 #endif
 699                 /* this option is not essential, we can continue */
 700                 *reuseport = 0;
 701         }
 702 #else
 703         (void)reuseport;
 704 #endif /* defined(SO_REUSEPORT) */
 705 #if defined(IPV6_V6ONLY)
 706         if(addr->ai_family == AF_INET6 && v6only) {
 707                 if(setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
 708                         (void*)&on, (socklen_t)sizeof(on)) < 0) {
 709 #ifndef USE_WINSOCK
 710                         log_err("setsockopt(..., IPV6_V6ONLY, ...) failed: %s",
 711                                 strerror(errno));
 712                         close(s);
 713 #else
 714                         log_err("setsockopt(..., IPV6_V6ONLY, ...) failed: %s",
 715                                 wsa_strerror(WSAGetLastError()));
 716                         closesocket(s);
 717 #endif
 718                         return -1;
 719                 }
 720         }
 721 #else
 722         (void)v6only;
 723 #endif /* IPV6_V6ONLY */
 724 #ifdef IP_TRANSPARENT
 725         if (transparent &&
 726             setsockopt(s, IPPROTO_IP, IP_TRANSPARENT, (void*)&on,
 727             (socklen_t)sizeof(on)) < 0) {
 728                 log_warn("setsockopt(.. IP_TRANSPARENT ..) failed: %s",
 729                         strerror(errno));
 730         }
 731 #elif defined(IP_BINDANY)
 732         if (transparent &&
 733             setsockopt(s, (addr->ai_family==AF_INET6? IPPROTO_IPV6:IPPROTO_IP),
 734             (addr->ai_family == AF_INET6? IPV6_BINDANY:IP_BINDANY),
 735             (void*)&on, (socklen_t)sizeof(on)) < 0) {
 736                 log_warn("setsockopt(.. IP%s_BINDANY ..) failed: %s",
 737                 (addr->ai_family==AF_INET6?"V6":""), strerror(errno));
 738         }
 739 #endif /* IP_TRANSPARENT || IP_BINDANY */
 740         if(
 741 #ifdef HAVE_SYSTEMD
 742                 !got_fd_from_systemd &&
 743 #endif
 744         bind(s, addr->ai_addr, addr->ai_addrlen) != 0) {
 745 #ifndef USE_WINSOCK
 746                 /* detect freebsd jail with no ipv6 permission */
 747                 if(addr->ai_family==AF_INET6 && errno==EINVAL)
 748                         *noproto = 1;
 749                 else {
 750                         log_err_addr("can't bind socket", strerror(errno),
 751                                 (struct sockaddr_storage*)addr->ai_addr,
 752                                 addr->ai_addrlen);
 753                 }
 754                 close(s);
 755 #else
 756                 log_err_addr("can't bind socket",
 757                         wsa_strerror(WSAGetLastError()),
 758                         (struct sockaddr_storage*)addr->ai_addr,
 759                         addr->ai_addrlen);
 760                 closesocket(s);
 761 #endif
 762                 return -1;
 763         }
 764         if(!fd_set_nonblock(s)) {
 765 #ifndef USE_WINSOCK
 766                 close(s);
 767 #else
 768                 closesocket(s);
 769 #endif
 770                 return -1;
 771         }
 772         if(listen(s, TCP_BACKLOG) == -1) {
 773 #ifndef USE_WINSOCK
 774                 log_err("can't listen: %s", strerror(errno));
 775                 close(s);
 776 #else
 777                 log_err("can't listen: %s", wsa_strerror(WSAGetLastError()));
 778                 closesocket(s);
 779 #endif
 780                 return -1;
 781         }
 782 #ifdef USE_TCP_FASTOPEN
 783         /* qlen specifies how many outstanding TFO requests to allow. Limit is a defense
 784            against IP spoofing attacks as suggested in RFC7413 */
 785 #ifdef __APPLE__
 786         /* OS X implementation only supports qlen of 1 via this call. Actual
 787            value is configured by the net.inet.tcp.fastopen_backlog kernel parm. */
 788         qlen = 1;
 789 #else
 790         /* 5 is recommended on linux */
 791         qlen = 5;
 792 #endif
 793         if ((setsockopt(s, IPPROTO_TCP, TCP_FASTOPEN, &qlen,
 794                   sizeof(qlen))) == -1 ) {
 795                 log_err("Setting TCP Fast Open as server failed: %s", strerror(errno));
 796         }
 797 #endif
 798         return s;
 799 }
 800
 801 int
 802 create_local_accept_sock(const char *path, int* noproto, int use_systemd)
 803 {
 804 #ifdef HAVE_SYSTEMD
 805         int ret;
 806
 807         if (use_systemd && (ret = systemd_get_activated(AF_LOCAL, SOCK_STREAM, 1, NULL, 0, path)) != -1)
 808                 return ret;
 809         else {
 810 #endif
 811 #ifdef HAVE_SYS_UN_H
 812         int s;
 813         struct sockaddr_un usock;
 814 #ifndef HAVE_SYSTEMD
 815         (void)use_systemd;
 816 #endif
 817
 818         verbose(VERB_ALGO, "creating unix socket %s", path);
 819 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 820         /* this member exists on BSDs, not Linux */
 821         usock.sun_len = (unsigned)sizeof(usock);
 822 #endif
 823         usock.sun_family = AF_LOCAL;
 824         /* length is 92-108, 104 on FreeBSD */
 825         (void)strlcpy(usock.sun_path, path, sizeof(usock.sun_path));
 826
 827         if ((s = socket(AF_LOCAL, SOCK_STREAM, 0)) == -1) {
 828                 log_err("Cannot create local socket %s (%s)",
 829                         path, strerror(errno));
 830                 return -1;
 831         }
 832
 833         if (unlink(path) && errno != ENOENT) {
 834                 /* The socket already exists and cannot be removed */
 835                 log_err("Cannot remove old local socket %s (%s)",
 836                         path, strerror(errno));
 837                 goto err;
 838         }
 839
 840         if (bind(s, (struct sockaddr *)&usock,
 841                 (socklen_t)sizeof(struct sockaddr_un)) == -1) {
 842                 log_err("Cannot bind local socket %s (%s)",
 843                         path, strerror(errno));
 844                 goto err;
 845         }
 846
 847         if (!fd_set_nonblock(s)) {
 848                 log_err("Cannot set non-blocking mode");
 849                 goto err;
 850         }
 851
 852         if (listen(s, TCP_BACKLOG) == -1) {
 853                 log_err("can't listen: %s", strerror(errno));
 854                 goto err;
 855         }
 856
 857         (void)noproto; /*unused*/
 858         return s;
 859
 860 err:
 861 #ifndef USE_WINSOCK
 862         close(s);
 863 #else
 864         closesocket(s);
 865 #endif
 866         return -1;
 867
 868 #ifdef HAVE_SYSTEMD
 869         }
 870 #endif
 871 #else
 872         (void)use_systemd;
 873         (void)path;
 874         log_err("Local sockets are not supported");
 875         *noproto = 1;
 876         return -1;
 877 #endif
 878 }
 879
 880
 881 /**
 882  * Create socket from getaddrinfo results
 883  */
 884 static int
 885 make_sock(int stype, const char* ifname, const char* port,
 886         struct addrinfo *hints, int v6only, int* noip6, size_t rcv, size_t snd,
 887         int* reuseport, int transparent, int tcp_mss, int freebind, int use_systemd)
 888 {
 889         struct addrinfo *res = NULL;
 890         int r, s, inuse, noproto;
 891         hints->ai_socktype = stype;
 892         *noip6 = 0;
 893         if((r=getaddrinfo(ifname, port, hints, &res)) != 0 || !res) {
 894 #ifdef USE_WINSOCK
 895                 if(r == EAI_NONAME && hints->ai_family == AF_INET6){
 896                         *noip6 = 1; /* 'Host not found' for IP6 on winXP */
 897                         return -1;
 898                 }
 899 #endif
 900                 log_err("node %s:%s getaddrinfo: %s %s",
 901                         ifname?ifname:"default", port, gai_strerror(r),
 902 #ifdef EAI_SYSTEM
 903                         r==EAI_SYSTEM?(char*)strerror(errno):""
 904 #else
 905                         ""
 906 #endif
 907                 );
 908                 return -1;
 909         }
 910         if(stype == SOCK_DGRAM) {
 911                 verbose_print_addr(res);
 912                 s = create_udp_sock(res->ai_family, res->ai_socktype,
 913                         (struct sockaddr*)res->ai_addr, res->ai_addrlen,
 914                         v6only, &inuse, &noproto, (int)rcv, (int)snd, 1,
 915                         reuseport, transparent, freebind, use_systemd);
 916                 if(s == -1 && inuse) {
 917                         log_err("bind: address already in use");
 918                 } else if(s == -1 && noproto && hints->ai_family == AF_INET6){
 919                         *noip6 = 1;
 920                 }
 921         } else  {
 922                 s = create_tcp_accept_sock(res, v6only, &noproto, reuseport,
 923                         transparent, tcp_mss, freebind, use_systemd);
 924                 if(s == -1 && noproto && hints->ai_family == AF_INET6){
 925                         *noip6 = 1;
 926                 }
 927         }
 928         freeaddrinfo(res);
 929         return s;
 930 }
 931
 932 /** make socket and first see if ifname contains port override info */
 933 static int
 934 make_sock_port(int stype, const char* ifname, const char* port,
 935         struct addrinfo *hints, int v6only, int* noip6, size_t rcv, size_t snd,
 936         int* reuseport, int transparent, int tcp_mss, int freebind, int use_systemd)
 937 {
 938         char* s = strchr(ifname, '@');
 939         if(s) {
 940                 /* override port with ifspec@port */
 941                 char p[16];
 942                 char newif[128];
 943                 if((size_t)(s-ifname) >= sizeof(newif)) {
 944                         log_err("ifname too long: %s", ifname);
 945                         *noip6 = 0;
 946                         return -1;
 947                 }
 948                 if(strlen(s+1) >= sizeof(p)) {
 949                         log_err("portnumber too long: %s", ifname);
 950                         *noip6 = 0;
 951                         return -1;
 952                 }
 953                 (void)strlcpy(newif, ifname, sizeof(newif));
 954                 newif[s-ifname] = 0;
 955                 (void)strlcpy(p, s+1, sizeof(p));
 956                 p[strlen(s+1)]=0;
 957                 return make_sock(stype, newif, p, hints, v6only, noip6,
 958                         rcv, snd, reuseport, transparent, tcp_mss, freebind, use_systemd);
 959         }
 960         return make_sock(stype, ifname, port, hints, v6only, noip6, rcv, snd,
 961                 reuseport, transparent, tcp_mss, freebind, use_systemd);
 962 }
 963
 964 /**
 965  * Add port to open ports list.
 966  * @param list: list head. changed.
 967  * @param s: fd.
 968  * @param ftype: if fd is UDP.
 969  * @return false on failure. list in unchanged then.
 970  */
 971 static int
 972 port_insert(struct listen_port** list, int s, enum listen_type ftype)
 973 {
 974         struct listen_port* item = (struct listen_port*)malloc(
 975                 sizeof(struct listen_port));
 976         if(!item)
 977                 return 0;
 978         item->next = *list;
 979         item->fd = s;
 980         item->ftype = ftype;
 981         *list = item;
 982         return 1;
 983 }
 984
 985 /** set fd to receive source address packet info */
 986 static int
 987 set_recvpktinfo(int s, int family)
 988 {
 989 #if defined(IPV6_RECVPKTINFO) || defined(IPV6_PKTINFO) || (defined(IP_RECVDSTADDR) && defined(IP_SENDSRCADDR)) || defined(IP_PKTINFO)
 990         int on = 1;
 991 #else
 992         (void)s;
 993 #endif
 994         if(family == AF_INET6) {
 995 #           ifdef IPV6_RECVPKTINFO
 996                 if(setsockopt(s, IPPROTO_IPV6, IPV6_RECVPKTINFO,
 997                         (void*)&on, (socklen_t)sizeof(on)) < 0) {
 998                         log_err("setsockopt(..., IPV6_RECVPKTINFO, ...) failed: %s",
 999                                 strerror(errno));
1000                         return 0;
1001                 }
1002 #           elif defined(IPV6_PKTINFO)
1003                 if(setsockopt(s, IPPROTO_IPV6, IPV6_PKTINFO,
1004                         (void*)&on, (socklen_t)sizeof(on)) < 0) {
1005                         log_err("setsockopt(..., IPV6_PKTINFO, ...) failed: %s",
1006                                 strerror(errno));
1007                         return 0;
1008                 }
1009 #           else
1010                 log_err("no IPV6_RECVPKTINFO and no IPV6_PKTINFO option, please "
1011                         "disable interface-automatic or do-ip6 in config");
1012                 return 0;
1013 #           endif /* defined IPV6_RECVPKTINFO */
1014
1015         } else if(family == AF_INET) {
1016 #           ifdef IP_PKTINFO
1017                 if(setsockopt(s, IPPROTO_IP, IP_PKTINFO,
1018                         (void*)&on, (socklen_t)sizeof(on)) < 0) {
1019                         log_err("setsockopt(..., IP_PKTINFO, ...) failed: %s",
1020                                 strerror(errno));
1021                         return 0;
1022                 }
1023 #           elif defined(IP_RECVDSTADDR) && defined(IP_SENDSRCADDR)
1024                 if(setsockopt(s, IPPROTO_IP, IP_RECVDSTADDR,
1025                         (void*)&on, (socklen_t)sizeof(on)) < 0) {
1026                         log_err("setsockopt(..., IP_RECVDSTADDR, ...) failed: %s",
1027                                 strerror(errno));
1028                         return 0;
1029                 }
1030 #           else
1031                 log_err("no IP_SENDSRCADDR or IP_PKTINFO option, please disable "
1032                         "interface-automatic or do-ip4 in config");
1033                 return 0;
1034 #           endif /* IP_PKTINFO */
1035
1036         }
1037         return 1;
1038 }
1039
1040 /**
1041  * Helper for ports_open. Creates one interface (or NULL for default).
1042  * @param ifname: The interface ip address.
1043  * @param do_auto: use automatic interface detection.
1044  *      If enabled, then ifname must be the wildcard name.
1045  * @param do_udp: if udp should be used.
1046  * @param do_tcp: if udp should be used.
1047  * @param hints: for getaddrinfo. family and flags have to be set by caller.
1048  * @param port: Port number to use (as string).
1049  * @param list: list of open ports, appended to, changed to point to list head.
1050  * @param rcv: receive buffer size for UDP
1051  * @param snd: send buffer size for UDP
1052  * @param ssl_port: ssl service port number
1053  * @param reuseport: try to set SO_REUSEPORT if nonNULL and true.
1054  *      set to false on exit if reuseport failed due to no kernel support.
1055  * @param transparent: set IP_TRANSPARENT socket option.
1056  * @param tcp_mss: maximum segment size of tcp socket. default if zero.
1057  * @param freebind: set IP_FREEBIND socket option.
1058  * @param use_systemd: if true, fetch sockets from systemd.
1059  * @param dnscrypt_port: dnscrypt service port number
1060  * @return: returns false on error.
1061  */
1062 static int
1063 ports_create_if(const char* ifname, int do_auto, int do_udp, int do_tcp,
1064         struct addrinfo *hints, const char* port, struct listen_port** list,
1065         size_t rcv, size_t snd, int ssl_port, int* reuseport, int transparent,
1066         int tcp_mss, int freebind, int use_systemd, int dnscrypt_port)
1067 {
1068         int s, noip6=0;
1069 #ifdef USE_DNSCRYPT
1070         int is_dnscrypt = ((strchr(ifname, '@') &&
1071                         atoi(strchr(ifname, '@')+1) == dnscrypt_port) ||
1072                         (!strchr(ifname, '@') && atoi(port) == dnscrypt_port));
1073 #else
1074         int is_dnscrypt = 0;
1075         (void)dnscrypt_port;
1076 #endif
1077
1078         if(!do_udp && !do_tcp)
1079                 return 0;
1080         if(do_auto) {
1081                 if((s = make_sock_port(SOCK_DGRAM, ifname, port, hints, 1,
1082                         &noip6, rcv, snd, reuseport, transparent,
1083                         tcp_mss, freebind, use_systemd)) == -1) {
1084                         if(noip6) {
1085                                 log_warn("IPv6 protocol not available");
1086                                 return 1;
1087                         }
1088                         return 0;
1089                 }
1090                 /* getting source addr packet info is highly non-portable */
1091                 if(!set_recvpktinfo(s, hints->ai_family)) {
1092 #ifndef USE_WINSOCK
1093                         close(s);
1094 #else
1095                         closesocket(s);
1096 #endif
1097                         return 0;
1098                 }
1099                 if(!port_insert(list, s,
1100                    is_dnscrypt?listen_type_udpancil_dnscrypt:listen_type_udpancil)) {
1101 #ifndef USE_WINSOCK
1102                         close(s);
1103 #else
1104                         closesocket(s);
1105 #endif
1106                         return 0;
1107                 }
1108         } else if(do_udp) {
1109                 /* regular udp socket */
1110                 if((s = make_sock_port(SOCK_DGRAM, ifname, port, hints, 1,
1111                         &noip6, rcv, snd, reuseport, transparent,
1112                         tcp_mss, freebind, use_systemd)) == -1) {
1113                         if(noip6) {
1114                                 log_warn("IPv6 protocol not available");
1115                                 return 1;
1116                         }
1117                         return 0;
1118                 }
1119                 if(!port_insert(list, s,
1120                    is_dnscrypt?listen_type_udp_dnscrypt:listen_type_udp)) {
1121 #ifndef USE_WINSOCK
1122                         close(s);
1123 #else
1124                         closesocket(s);
1125 #endif
1126                         return 0;
1127                 }
1128         }
1129         if(do_tcp) {
1130                 int is_ssl = ((strchr(ifname, '@') &&
1131                         atoi(strchr(ifname, '@')+1) == ssl_port) ||
1132                         (!strchr(ifname, '@') && atoi(port) == ssl_port));
1133                 if((s = make_sock_port(SOCK_STREAM, ifname, port, hints, 1,
1134                         &noip6, 0, 0, reuseport, transparent, tcp_mss,
1135                         freebind, use_systemd)) == -1) {
1136                         if(noip6) {
1137                                 /*log_warn("IPv6 protocol not available");*/
1138                                 return 1;
1139                         }
1140                         return 0;
1141                 }
1142                 if(is_ssl)
1143                         verbose(VERB_ALGO, "setup TCP for SSL service");
1144                 if(!port_insert(list, s, is_ssl?listen_type_ssl:
1145                         (is_dnscrypt?listen_type_tcp_dnscrypt:listen_type_tcp))) {
1146 #ifndef USE_WINSOCK
1147                         close(s);
1148 #else
1149                         closesocket(s);
1150 #endif
1151                         return 0;
1152                 }
1153         }
1154         return 1;
1155 }
1156
1157 /**
1158  * Add items to commpoint list in front.
1159  * @param c: commpoint to add.
1160  * @param front: listen struct.
1161  * @return: false on failure.
1162  */
1163 static int
1164 listen_cp_insert(struct comm_point* c, struct listen_dnsport* front)
1165 {
1166         struct listen_list* item = (struct listen_list*)malloc(
1167                 sizeof(struct listen_list));
1168         if(!item)
1169                 return 0;
1170         item->com = c;
1171         item->next = front->cps;
1172         front->cps = item;
1173         return 1;
1174 }
1175
1176 struct listen_dnsport*
1177 listen_create(struct comm_base* base, struct listen_port* ports,
1178         size_t bufsize, int tcp_accept_count, void* sslctx,
1179         struct dt_env* dtenv, comm_point_callback_type* cb, void *cb_arg)
1180 {
1181         struct listen_dnsport* front = (struct listen_dnsport*)
1182                 malloc(sizeof(struct listen_dnsport));
1183         if(!front)
1184                 return NULL;
1185         front->cps = NULL;
1186         front->udp_buff = sldns_buffer_new(bufsize);
1187 #ifdef USE_DNSCRYPT
1188         front->dnscrypt_udp_buff = NULL;
1189 #endif
1190         if(!front->udp_buff) {
1191                 free(front);
1192                 return NULL;
1193         }
1194
1195         /* create comm points as needed */
1196         while(ports) {
1197                 struct comm_point* cp = NULL;
1198                 if(ports->ftype == listen_type_udp ||
1199                    ports->ftype == listen_type_udp_dnscrypt)
1200                         cp = comm_point_create_udp(base, ports->fd,
1201                                 front->udp_buff, cb, cb_arg);
1202                 else if(ports->ftype == listen_type_tcp ||
1203                                 ports->ftype == listen_type_tcp_dnscrypt)
1204                         cp = comm_point_create_tcp(base, ports->fd,
1205                                 tcp_accept_count, bufsize, cb, cb_arg);
1206                 else if(ports->ftype == listen_type_ssl) {
1207                         cp = comm_point_create_tcp(base, ports->fd,
1208                                 tcp_accept_count, bufsize, cb, cb_arg);
1209                         cp->ssl = sslctx;
1210                 } else if(ports->ftype == listen_type_udpancil ||
1211                                   ports->ftype == listen_type_udpancil_dnscrypt)
1212                         cp = comm_point_create_udp_ancil(base, ports->fd,
1213                                 front->udp_buff, cb, cb_arg);
1214                 if(!cp) {
1215                         log_err("can't create commpoint");
1216                         listen_delete(front);
1217                         return NULL;
1218                 }
1219                 cp->dtenv = dtenv;
1220                 cp->do_not_close = 1;
1221 #ifdef USE_DNSCRYPT
1222                 if (ports->ftype == listen_type_udp_dnscrypt ||
1223                         ports->ftype == listen_type_tcp_dnscrypt ||
1224                         ports->ftype == listen_type_udpancil_dnscrypt) {
1225                         cp->dnscrypt = 1;
1226             cp->dnscrypt_buffer = sldns_buffer_new(bufsize);
1227             if(!cp->dnscrypt_buffer) {
1228                 log_err("can't alloc dnscrypt_buffer");
1229                 comm_point_delete(cp);
1230                 listen_delete(front);
1231                 return NULL;
1232             }
1233             front->dnscrypt_udp_buff = cp->dnscrypt_buffer;
1234         }
1235 #endif
1236                 if(!listen_cp_insert(cp, front)) {
1237                         log_err("malloc failed");
1238                         comm_point_delete(cp);
1239                         listen_delete(front);
1240                         return NULL;
1241                 }
1242                 ports = ports->next;
1243         }
1244         if(!front->cps) {
1245                 log_err("Could not open sockets to accept queries.");
1246                 listen_delete(front);
1247                 return NULL;
1248         }
1249
1250         return front;
1251 }
1252
1253 void
1254 listen_list_delete(struct listen_list* list)
1255 {
1256         struct listen_list *p = list, *pn;
1257         while(p) {
1258                 pn = p->next;
1259                 comm_point_delete(p->com);
1260                 free(p);
1261                 p = pn;
1262         }
1263 }
1264
1265 void
1266 listen_delete(struct listen_dnsport* front)
1267 {
1268         if(!front)
1269                 return;
1270         listen_list_delete(front->cps);
1271 #ifdef USE_DNSCRYPT
1272     if(front->dnscrypt_udp_buff &&
1273        front->udp_buff != front->dnscrypt_udp_buff) {
1274         sldns_buffer_free(front->dnscrypt_udp_buff);
1275     }
1276 #endif
1277         sldns_buffer_free(front->udp_buff);
1278         free(front);
1279 }
1280
1281 struct listen_port*
1282 listening_ports_open(struct config_file* cfg, int* reuseport)
1283 {
1284         struct listen_port* list = NULL;
1285         struct addrinfo hints;
1286         int i, do_ip4, do_ip6;
1287         int do_tcp, do_auto;
1288         char portbuf[32];
1289         snprintf(portbuf, sizeof(portbuf), "%d", cfg->port);
1290         do_ip4 = cfg->do_ip4;
1291         do_ip6 = cfg->do_ip6;
1292         do_tcp = cfg->do_tcp;
1293         do_auto = cfg->if_automatic && cfg->do_udp;
1294         if(cfg->incoming_num_tcp == 0)
1295                 do_tcp = 0;
1296
1297         /* getaddrinfo */
1298         memset(&hints, 0, sizeof(hints));
1299         hints.ai_flags = AI_PASSIVE;
1300         /* no name lookups on our listening ports */
1301         if(cfg->num_ifs > 0)
1302                 hints.ai_flags |= AI_NUMERICHOST;
1303         hints.ai_family = AF_UNSPEC;
1304 #ifndef INET6
1305         do_ip6 = 0;
1306 #endif
1307         if(!do_ip4 && !do_ip6) {
1308                 return NULL;
1309         }
1310         /* create ip4 and ip6 ports so that return addresses are nice. */
1311         if(do_auto || cfg->num_ifs == 0) {
1312                 if(do_ip6) {
1313                         hints.ai_family = AF_INET6;
1314                         if(!ports_create_if(do_auto?"::0":"::1",
1315                                 do_auto, cfg->do_udp, do_tcp,
1316                                 &hints, portbuf, &list,
1317                                 cfg->so_rcvbuf, cfg->so_sndbuf,
1318                                 cfg->ssl_port, reuseport,
1319                                 cfg->ip_transparent,
1320                                 cfg->tcp_mss, cfg->ip_freebind, cfg->use_systemd,
1321                                 cfg->dnscrypt_port)) {
1322                                 listening_ports_free(list);
1323                                 return NULL;
1324                         }
1325                 }
1326                 if(do_ip4) {
1327                         hints.ai_family = AF_INET;
1328                         if(!ports_create_if(do_auto?"0.0.0.0":"127.0.0.1",
1329                                 do_auto, cfg->do_udp, do_tcp,
1330                                 &hints, portbuf, &list,
1331                                 cfg->so_rcvbuf, cfg->so_sndbuf,
1332                                 cfg->ssl_port, reuseport,
1333                                 cfg->ip_transparent,
1334                                 cfg->tcp_mss, cfg->ip_freebind, cfg->use_systemd,
1335                                 cfg->dnscrypt_port)) {
1336                                 listening_ports_free(list);
1337                                 return NULL;
1338                         }
1339                 }
1340         } else for(i = 0; i<cfg->num_ifs; i++) {
1341                 if(str_is_ip6(cfg->ifs[i])) {
1342                         if(!do_ip6)
1343                                 continue;
1344                         hints.ai_family = AF_INET6;
1345                         if(!ports_create_if(cfg->ifs[i], 0, cfg->do_udp,
1346                                 do_tcp, &hints, portbuf, &list,
1347                                 cfg->so_rcvbuf, cfg->so_sndbuf,
1348                                 cfg->ssl_port, reuseport,
1349                                 cfg->ip_transparent,
1350                                 cfg->tcp_mss, cfg->ip_freebind, cfg->use_systemd,
1351                                 cfg->dnscrypt_port)) {
1352                                 listening_ports_free(list);
1353                                 return NULL;
1354                         }
1355                 } else {
1356                         if(!do_ip4)
1357                                 continue;
1358                         hints.ai_family = AF_INET;
1359                         if(!ports_create_if(cfg->ifs[i], 0, cfg->do_udp,
1360                                 do_tcp, &hints, portbuf, &list,
1361                                 cfg->so_rcvbuf, cfg->so_sndbuf,
1362                                 cfg->ssl_port, reuseport,
1363                                 cfg->ip_transparent,
1364                                 cfg->tcp_mss, cfg->ip_freebind, cfg->use_systemd,
1365                                 cfg->dnscrypt_port)) {
1366                                 listening_ports_free(list);
1367                                 return NULL;
1368                         }
1369                 }
1370         }
1371         return list;
1372 }
1373
1374 void listening_ports_free(struct listen_port* list)
1375 {
1376         struct listen_port* nx;
1377         while(list) {
1378                 nx = list->next;
1379                 if(list->fd != -1) {
1380 #ifndef USE_WINSOCK
1381                         close(list->fd);
1382 #else
1383                         closesocket(list->fd);
1384 #endif
1385                 }
1386                 free(list);
1387                 list = nx;
1388         }
1389 }
1390
1391 size_t listen_get_mem(struct listen_dnsport* listen)
1392 {
1393         struct listen_list* p;
1394         size_t s = sizeof(*listen) + sizeof(*listen->base) +
1395                 sizeof(*listen->udp_buff) +
1396                 sldns_buffer_capacity(listen->udp_buff);
1397 #ifdef USE_DNSCRYPT
1398         s += sizeof(*listen->dnscrypt_udp_buff);
1399         if(listen->udp_buff != listen->dnscrypt_udp_buff){
1400                 s += sldns_buffer_capacity(listen->dnscrypt_udp_buff);
1401         }
1402 #endif
1403         for(p = listen->cps; p; p = p->next) {
1404                 s += sizeof(*p);
1405                 s += comm_point_get_mem(p->com);
1406         }
1407         return s;
1408 }
1409
1410 void listen_stop_accept(struct listen_dnsport* listen)
1411 {
1412         /* do not stop the ones that have no tcp_free list
1413          * (they have already stopped listening) */
1414         struct listen_list* p;
1415         for(p=listen->cps; p; p=p->next) {
1416                 if(p->com->type == comm_tcp_accept &&
1417                         p->com->tcp_free != NULL) {
1418                         comm_point_stop_listening(p->com);
1419                 }
1420         }
1421 }
1422
1423 void listen_start_accept(struct listen_dnsport* listen)
1424 {
1425         /* do not start the ones that have no tcp_free list, it is no
1426          * use to listen to them because they have no free tcp handlers */
1427         struct listen_list* p;
1428         for(p=listen->cps; p; p=p->next) {
1429                 if(p->com->type == comm_tcp_accept &&
1430                         p->com->tcp_free != NULL) {
1431                         comm_point_start_listening(p->com, -1, -1);
1432                 }
1433         }
1434 }
1435