lib/tsocket/tsocket_bsd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Stefan Metzmacher 2009
   5
   6      ** NOTE! The following LGPL license applies to the tevent
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 3 of the License, or (at your option) any later version.
  14
  15    This library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "replace.h"
  25 #include "system/filesys.h"
  26 #include "system/network.h"
  27 #include "tsocket.h"
  28 #include "tsocket_internal.h"
  29
  30 static int tsocket_bsd_error_from_errno(int ret,
  31                                         int sys_errno,
  32                                         bool *retry)
  33 {
  34         *retry = false;
  35
  36         if (ret >= 0) {
  37                 return 0;
  38         }
  39
  40         if (ret != -1) {
  41                 return EIO;
  42         }
  43
  44         if (sys_errno == 0) {
  45                 return EIO;
  46         }
  47
  48         if (sys_errno == EINTR) {
  49                 *retry = true;
  50                 return sys_errno;
  51         }
  52
  53         if (sys_errno == EINPROGRESS) {
  54                 *retry = true;
  55                 return sys_errno;
  56         }
  57
  58         if (sys_errno == EAGAIN) {
  59                 *retry = true;
  60                 return sys_errno;
  61         }
  62
  63 #ifdef EWOULDBLOCK
  64         if (sys_errno == EWOULDBLOCK) {
  65                 *retry = true;
  66                 return sys_errno;
  67         }
  68 #endif
  69
  70         return sys_errno;
  71 }
  72
  73 static int tsocket_bsd_common_prepare_fd(int fd, bool high_fd)
  74 {
  75         int i;
  76         int sys_errno = 0;
  77         int fds[3];
  78         int num_fds = 0;
  79
  80         int result, flags;
  81
  82         if (fd == -1) {
  83                 return -1;
  84         }
  85
  86         /* first make a fd >= 3 */
  87         if (high_fd) {
  88                 while (fd < 3) {
  89                         fds[num_fds++] = fd;
  90                         fd = dup(fd);
  91                         if (fd == -1) {
  92                                 sys_errno = errno;
  93                                 break;
  94                         }
  95                 }
  96                 for (i=0; i<num_fds; i++) {
  97                         close(fds[i]);
  98                 }
  99                 if (fd == -1) {
 100                         errno = sys_errno;
 101                         return fd;
 102                 }
 103         }
 104
 105         /* fd should be nonblocking. */
 106
 107 #ifdef O_NONBLOCK
 108 #define FLAG_TO_SET O_NONBLOCK
 109 #else
 110 #ifdef SYSV
 111 #define FLAG_TO_SET O_NDELAY
 112 #else /* BSD */
 113 #define FLAG_TO_SET FNDELAY
 114 #endif
 115 #endif
 116
 117         if ((flags = fcntl(fd, F_GETFL)) == -1) {
 118                 goto fail;
 119         }
 120
 121         flags |= FLAG_TO_SET;
 122         if (fcntl(fd, F_SETFL, flags) == -1) {
 123                 goto fail;
 124         }
 125
 126 #undef FLAG_TO_SET
 127
 128         /* fd should be closed on exec() */
 129 #ifdef FD_CLOEXEC
 130         result = flags = fcntl(fd, F_GETFD, 0);
 131         if (flags >= 0) {
 132                 flags |= FD_CLOEXEC;
 133                 result = fcntl(fd, F_SETFD, flags);
 134         }
 135         if (result < 0) {
 136                 goto fail;
 137         }
 138 #endif
 139         return fd;
 140
 141  fail:
 142         if (fd != -1) {
 143                 sys_errno = errno;
 144                 close(fd);
 145                 errno = sys_errno;
 146         }
 147         return -1;
 148 }
 149
 150 static ssize_t tsocket_bsd_pending(int fd)
 151 {
 152         int ret;
 153         int value = 0;
 154
 155         ret = ioctl(fd, FIONREAD, &value);
 156         if (ret == -1) {
 157                 return ret;
 158         }
 159
 160         if (ret == 0) {
 161                 if (value == 0) {
 162                         int error=0;
 163                         socklen_t len = sizeof(error);
 164                         /*
 165                          * if no data is available check if the socket
 166                          * is in error state. For dgram sockets
 167                          * it's the way to return ICMP error messages
 168                          * of connected sockets to the caller.
 169                          */
 170                         ret = getsockopt(fd, SOL_SOCKET, SO_ERROR,
 171                                          &error, &len);
 172                         if (ret == -1) {
 173                                 return ret;
 174                         }
 175                         if (error != 0) {
 176                                 errno = error;
 177                                 return -1;
 178                         }
 179                 }
 180                 return value;
 181         }
 182
 183         /* this should not be reached */
 184         errno = EIO;
 185         return -1;
 186 }
 187
 188 static const struct tsocket_address_ops tsocket_address_bsd_ops;
 189
 190 struct tsocket_address_bsd {
 191         union {
 192                 struct sockaddr sa;
 193                 struct sockaddr_in in;
 194 #ifdef HAVE_IPV6
 195                 struct sockaddr_in6 in6;
 196 #endif
 197                 struct sockaddr_un un;
 198                 struct sockaddr_storage ss;
 199         } u;
 200 };
 201
 202 static int _tsocket_address_bsd_from_sockaddr(TALLOC_CTX *mem_ctx,
 203                                               struct sockaddr *sa,
 204                                               socklen_t sa_len,
 205                                               struct tsocket_address **_addr,
 206                                               const char *location)
 207 {
 208         struct tsocket_address *addr;
 209         struct tsocket_address_bsd *bsda;
 210
 211         switch (sa->sa_family) {
 212         case AF_UNIX:
 213                 if (sa_len < sizeof(struct sockaddr_un)) {
 214                         errno = EINVAL;
 215                         return -1;
 216                 }
 217                 break;
 218         case AF_INET:
 219                 if (sa_len < sizeof(struct sockaddr_in)) {
 220                         errno = EINVAL;
 221                         return -1;
 222                 }
 223                 break;
 224 #ifdef HAVE_IPV6
 225         case AF_INET6:
 226                 if (sa_len < sizeof(struct sockaddr_in6)) {
 227                         errno = EINVAL;
 228                         return -1;
 229                 }
 230                 break;
 231 #endif
 232         default:
 233                 errno = EAFNOSUPPORT;
 234                 return -1;
 235         }
 236
 237         if (sa_len > sizeof(struct sockaddr_storage)) {
 238                 errno = EINVAL;
 239                 return -1;
 240         }
 241
 242         addr = tsocket_address_create(mem_ctx,
 243                                       &tsocket_address_bsd_ops,
 244                                       &bsda,
 245                                       struct tsocket_address_bsd,
 246                                       location);
 247         if (!addr) {
 248                 errno = ENOMEM;
 249                 return -1;
 250         }
 251
 252         ZERO_STRUCTP(bsda);
 253
 254         memcpy(&bsda->u.ss, sa, sa_len);
 255
 256         *_addr = addr;
 257         return 0;
 258 }
 259
 260 int _tsocket_address_inet_from_strings(TALLOC_CTX *mem_ctx,
 261                                        const char *fam,
 262                                        const char *addr,
 263                                        uint16_t port,
 264                                        struct tsocket_address **_addr,
 265                                        const char *location)
 266 {
 267         struct addrinfo hints;
 268         struct addrinfo *result = NULL;
 269         char port_str[6];
 270         int ret;
 271
 272         ZERO_STRUCT(hints);
 273         /*
 274          * we use SOCKET_STREAM here to get just one result
 275          * back from getaddrinfo().
 276          */
 277         hints.ai_socktype = SOCK_STREAM;
 278         hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
 279
 280         if (strcasecmp(fam, "ip") == 0) {
 281                 hints.ai_family = AF_UNSPEC;
 282                 if (!addr) {
 283 #ifdef HAVE_IPV6
 284                         addr = "::";
 285 #else
 286                         addr = "0.0.0.0";
 287 #endif
 288                 }
 289         } else if (strcasecmp(fam, "ipv4") == 0) {
 290                 hints.ai_family = AF_INET;
 291                 if (!addr) {
 292                         addr = "0.0.0.0";
 293                 }
 294 #ifdef HAVE_IPV6
 295         } else if (strcasecmp(fam, "ipv6") == 0) {
 296                 hints.ai_family = AF_INET6;
 297                 if (!addr) {
 298                         addr = "::";
 299                 }
 300 #endif
 301         } else {
 302                 errno = EAFNOSUPPORT;
 303                 return -1;
 304         }
 305
 306         snprintf(port_str, sizeof(port_str) - 1, "%u", port);
 307
 308         ret = getaddrinfo(addr, port_str, &hints, &result);
 309         if (ret != 0) {
 310                 switch (ret) {
 311                 case EAI_FAIL:
 312                         errno = EINVAL;
 313                         break;
 314                 }
 315                 ret = -1;
 316                 goto done;
 317         }
 318
 319         if (result->ai_socktype != SOCK_STREAM) {
 320                 errno = EINVAL;
 321                 ret = -1;
 322                 goto done;
 323         }
 324
 325         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 326                                                   result->ai_addr,
 327                                                   result->ai_addrlen,
 328                                                   _addr,
 329                                                   location);
 330
 331 done:
 332         if (result) {
 333                 freeaddrinfo(result);
 334         }
 335         return ret;
 336 }
 337
 338 char *tsocket_address_inet_addr_string(const struct tsocket_address *addr,
 339                                        TALLOC_CTX *mem_ctx)
 340 {
 341         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 342                                            struct tsocket_address_bsd);
 343         char addr_str[INET6_ADDRSTRLEN+1];
 344         const char *str;
 345
 346         if (!bsda) {
 347                 errno = EINVAL;
 348                 return NULL;
 349         }
 350
 351         switch (bsda->u.sa.sa_family) {
 352         case AF_INET:
 353                 str = inet_ntop(bsda->u.in.sin_family,
 354                                 &bsda->u.in.sin_addr,
 355                                 addr_str, sizeof(addr_str));
 356                 break;
 357 #ifdef HAVE_IPV6
 358         case AF_INET6:
 359                 str = inet_ntop(bsda->u.in6.sin6_family,
 360                                 &bsda->u.in6.sin6_addr,
 361                                 addr_str, sizeof(addr_str));
 362                 break;
 363 #endif
 364         default:
 365                 errno = EINVAL;
 366                 return NULL;
 367         }
 368
 369         if (!str) {
 370                 return NULL;
 371         }
 372
 373         return talloc_strdup(mem_ctx, str);
 374 }
 375
 376 uint16_t tsocket_address_inet_port(const struct tsocket_address *addr)
 377 {
 378         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 379                                            struct tsocket_address_bsd);
 380         uint16_t port = 0;
 381
 382         if (!bsda) {
 383                 errno = EINVAL;
 384                 return 0;
 385         }
 386
 387         switch (bsda->u.sa.sa_family) {
 388         case AF_INET:
 389                 port = ntohs(bsda->u.in.sin_port);
 390                 break;
 391 #ifdef HAVE_IPV6
 392         case AF_INET6:
 393                 port = ntohs(bsda->u.in6.sin6_port);
 394                 break;
 395 #endif
 396         default:
 397                 errno = EINVAL;
 398                 return 0;
 399         }
 400
 401         return port;
 402 }
 403
 404 int tsocket_address_inet_set_port(struct tsocket_address *addr,
 405                                   uint16_t port)
 406 {
 407         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 408                                            struct tsocket_address_bsd);
 409
 410         if (!bsda) {
 411                 errno = EINVAL;
 412                 return -1;
 413         }
 414
 415         switch (bsda->u.sa.sa_family) {
 416         case AF_INET:
 417                 bsda->u.in.sin_port = htons(port);
 418                 break;
 419 #ifdef HAVE_IPV6
 420         case AF_INET6:
 421                 bsda->u.in6.sin6_port = htons(port);
 422                 break;
 423 #endif
 424         default:
 425                 errno = EINVAL;
 426                 return -1;
 427         }
 428
 429         return 0;
 430 }
 431
 432 int _tsocket_address_unix_from_path(TALLOC_CTX *mem_ctx,
 433                                     const char *path,
 434                                     struct tsocket_address **_addr,
 435                                     const char *location)
 436 {
 437         struct sockaddr_un un;
 438         void *p = &un;
 439         int ret;
 440
 441         if (!path) {
 442                 path = "";
 443         }
 444
 445         ZERO_STRUCT(un);
 446         un.sun_family = AF_UNIX;
 447         strncpy(un.sun_path, path, sizeof(un.sun_path));
 448
 449         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 450                                                  (struct sockaddr *)p,
 451                                                  sizeof(un),
 452                                                  _addr,
 453                                                  location);
 454
 455         return ret;
 456 }
 457
 458 char *tsocket_address_unix_path(const struct tsocket_address *addr,
 459                                 TALLOC_CTX *mem_ctx)
 460 {
 461         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 462                                            struct tsocket_address_bsd);
 463         const char *str;
 464
 465         if (!bsda) {
 466                 errno = EINVAL;
 467                 return NULL;
 468         }
 469
 470         switch (bsda->u.sa.sa_family) {
 471         case AF_UNIX:
 472                 str = bsda->u.un.sun_path;
 473                 break;
 474         default:
 475                 errno = EINVAL;
 476                 return NULL;
 477         }
 478
 479         return talloc_strdup(mem_ctx, str);
 480 }
 481
 482 static char *tsocket_address_bsd_string(const struct tsocket_address *addr,
 483                                         TALLOC_CTX *mem_ctx)
 484 {
 485         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 486                                            struct tsocket_address_bsd);
 487         char *str;
 488         char *addr_str;
 489         const char *prefix = NULL;
 490         uint16_t port;
 491
 492         switch (bsda->u.sa.sa_family) {
 493         case AF_UNIX:
 494                 return talloc_asprintf(mem_ctx, "unix:%s",
 495                                        bsda->u.un.sun_path);
 496         case AF_INET:
 497                 prefix = "ipv4";
 498                 break;
 499 #ifdef HAVE_IPV6
 500         case AF_INET6:
 501                 prefix = "ipv6";
 502                 break;
 503 #endif
 504         default:
 505                 errno = EINVAL;
 506                 return NULL;
 507         }
 508
 509         addr_str = tsocket_address_inet_addr_string(addr, mem_ctx);
 510         if (!addr_str) {
 511                 return NULL;
 512         }
 513
 514         port = tsocket_address_inet_port(addr);
 515
 516         str = talloc_asprintf(mem_ctx, "%s:%s:%u",
 517                               prefix, addr_str, port);
 518         talloc_free(addr_str);
 519
 520         return str;
 521 }
 522
 523 static struct tsocket_address *tsocket_address_bsd_copy(const struct tsocket_address *addr,
 524                                                          TALLOC_CTX *mem_ctx,
 525                                                          const char *location)
 526 {
 527         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 528                                            struct tsocket_address_bsd);
 529         struct tsocket_address *copy;
 530         int ret;
 531
 532         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 533                                                  &bsda->u.sa,
 534                                                  sizeof(bsda->u.ss),
 535                                                  &copy,
 536                                                  location);
 537         if (ret != 0) {
 538                 return NULL;
 539         }
 540
 541         return copy;
 542 }
 543
 544 static const struct tsocket_address_ops tsocket_address_bsd_ops = {
 545         .name           = "bsd",
 546         .string         = tsocket_address_bsd_string,
 547         .copy           = tsocket_address_bsd_copy,
 548 };
 549
 550 struct tdgram_bsd {
 551         int fd;
 552
 553         void *event_ptr;
 554         struct tevent_fd *fde;
 555
 556         void *readable_private;
 557         void (*readable_handler)(void *private_data);
 558         void *writeable_private;
 559         void (*writeable_handler)(void *private_data);
 560
 561         struct tevent_req *read_req;
 562         struct tevent_req *write_req;
 563 };
 564
 565 static void tdgram_bsd_fde_handler(struct tevent_context *ev,
 566                                    struct tevent_fd *fde,
 567                                    uint16_t flags,
 568                                    void *private_data)
 569 {
 570         struct tdgram_bsd *bsds = talloc_get_type_abort(private_data,
 571                                   struct tdgram_bsd);
 572
 573         if (flags & TEVENT_FD_WRITE) {
 574                 bsds->writeable_handler(bsds->writeable_private);
 575                 return;
 576         }
 577         if (flags & TEVENT_FD_READ) {
 578                 if (!bsds->readable_handler) {
 579                         TEVENT_FD_NOT_READABLE(bsds->fde);
 580                         return;
 581                 }
 582                 bsds->readable_handler(bsds->readable_private);
 583                 return;
 584         }
 585 }
 586
 587 static int tdgram_bsd_set_readable_handler(struct tdgram_bsd *bsds,
 588                                            struct tevent_context *ev,
 589                                            void (*handler)(void *private_data),
 590                                            void *private_data)
 591 {
 592         if (ev == NULL) {
 593                 if (handler) {
 594                         errno = EINVAL;
 595                         return -1;
 596                 }
 597                 if (!bsds->readable_handler) {
 598                         return 0;
 599                 }
 600                 bsds->readable_handler = NULL;
 601                 bsds->readable_private = NULL;
 602
 603                 return 0;
 604         }
 605
 606         /* read and write must use the same tevent_context */
 607         if (bsds->event_ptr != ev) {
 608                 if (bsds->readable_handler || bsds->writeable_handler) {
 609                         errno = EINVAL;
 610                         return -1;
 611                 }
 612                 bsds->event_ptr = NULL;
 613                 TALLOC_FREE(bsds->fde);
 614         }
 615
 616         if (bsds->fde == NULL) {
 617                 bsds->fde = tevent_add_fd(ev, bsds,
 618                                           bsds->fd, TEVENT_FD_READ,
 619                                           tdgram_bsd_fde_handler,
 620                                           bsds);
 621                 if (!bsds->fde) {
 622                         return -1;
 623                 }
 624
 625                 /* cache the event context we're running on */
 626                 bsds->event_ptr = ev;
 627         } else if (!bsds->readable_handler) {
 628                 TEVENT_FD_READABLE(bsds->fde);
 629         }
 630
 631         bsds->readable_handler = handler;
 632         bsds->readable_private = private_data;
 633
 634         return 0;
 635 }
 636
 637 static int tdgram_bsd_set_writeable_handler(struct tdgram_bsd *bsds,
 638                                             struct tevent_context *ev,
 639                                             void (*handler)(void *private_data),
 640                                             void *private_data)
 641 {
 642         if (ev == NULL) {
 643                 if (handler) {
 644                         errno = EINVAL;
 645                         return -1;
 646                 }
 647                 if (!bsds->writeable_handler) {
 648                         return 0;
 649                 }
 650                 bsds->writeable_handler = NULL;
 651                 bsds->writeable_private = NULL;
 652                 TEVENT_FD_NOT_WRITEABLE(bsds->fde);
 653
 654                 return 0;
 655         }
 656
 657         /* read and write must use the same tevent_context */
 658         if (bsds->event_ptr != ev) {
 659                 if (bsds->readable_handler || bsds->writeable_handler) {
 660                         errno = EINVAL;
 661                         return -1;
 662                 }
 663                 bsds->event_ptr = NULL;
 664                 TALLOC_FREE(bsds->fde);
 665         }
 666
 667         if (bsds->fde == NULL) {
 668                 bsds->fde = tevent_add_fd(ev, bsds,
 669                                           bsds->fd, TEVENT_FD_WRITE,
 670                                           tdgram_bsd_fde_handler,
 671                                           bsds);
 672                 if (!bsds->fde) {
 673                         return -1;
 674                 }
 675
 676                 /* cache the event context we're running on */
 677                 bsds->event_ptr = ev;
 678         } else if (!bsds->writeable_handler) {
 679                 TEVENT_FD_WRITEABLE(bsds->fde);
 680         }
 681
 682         bsds->writeable_handler = handler;
 683         bsds->writeable_private = private_data;
 684
 685         return 0;
 686 }
 687
 688 struct tdgram_bsd_recvfrom_state {
 689         struct tdgram_context *dgram;
 690
 691         uint8_t *buf;
 692         size_t len;
 693         struct tsocket_address *src;
 694 };
 695
 696 static int tdgram_bsd_recvfrom_destructor(struct tdgram_bsd_recvfrom_state *state)
 697 {
 698         struct tdgram_bsd *bsds = tdgram_context_data(state->dgram,
 699                                   struct tdgram_bsd);
 700
 701         bsds->read_req = NULL;
 702         tdgram_bsd_set_readable_handler(bsds, NULL, NULL, NULL);
 703
 704         return 0;
 705 }
 706
 707 static void tdgram_bsd_recvfrom_handler(void *private_data);
 708
 709 static struct tevent_req *tdgram_bsd_recvfrom_send(TALLOC_CTX *mem_ctx,
 710                                         struct tevent_context *ev,
 711                                         struct tdgram_context *dgram)
 712 {
 713         struct tevent_req *req;
 714         struct tdgram_bsd_recvfrom_state *state;
 715         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 716         int ret;
 717
 718         req = tevent_req_create(mem_ctx, &state,
 719                                 struct tdgram_bsd_recvfrom_state);
 720         if (!req) {
 721                 return NULL;
 722         }
 723
 724         state->dgram    = dgram;
 725         state->buf      = NULL;
 726         state->len      = 0;
 727         state->src      = NULL;
 728
 729         if (bsds->read_req) {
 730                 tevent_req_error(req, EBUSY);
 731                 goto post;
 732         }
 733         bsds->read_req = req;
 734
 735         talloc_set_destructor(state, tdgram_bsd_recvfrom_destructor);
 736
 737         if (bsds->fd == -1) {
 738                 tevent_req_error(req, ENOTCONN);
 739                 goto post;
 740         }
 741
 742         /*
 743          * this is a fast path, not waiting for the
 744          * socket to become explicit readable gains
 745          * about 10%-20% performance in benchmark tests.
 746          */
 747         tdgram_bsd_recvfrom_handler(req);
 748         if (!tevent_req_is_in_progress(req)) {
 749                 goto post;
 750         }
 751
 752         ret = tdgram_bsd_set_readable_handler(bsds, ev,
 753                                               tdgram_bsd_recvfrom_handler,
 754                                               req);
 755         if (ret == -1) {
 756                 tevent_req_error(req, errno);
 757                 goto post;
 758         }
 759
 760         return req;
 761
 762  post:
 763         tevent_req_post(req, ev);
 764         return req;
 765 }
 766
 767 static void tdgram_bsd_recvfrom_handler(void *private_data)
 768 {
 769         struct tevent_req *req = talloc_get_type_abort(private_data,
 770                                  struct tevent_req);
 771         struct tdgram_bsd_recvfrom_state *state = tevent_req_data(req,
 772                                         struct tdgram_bsd_recvfrom_state);
 773         struct tdgram_context *dgram = state->dgram;
 774         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 775         struct tsocket_address_bsd *bsda;
 776         ssize_t ret;
 777         struct sockaddr *sa = NULL;
 778         socklen_t sa_len = 0;
 779         int err;
 780         bool retry;
 781
 782         ret = tsocket_bsd_pending(bsds->fd);
 783         if (ret == 0) {
 784                 /* retry later */
 785                 return;
 786         }
 787         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 788         if (retry) {
 789                 /* retry later */
 790                 return;
 791         }
 792         if (tevent_req_error(req, err)) {
 793                 return;
 794         }
 795
 796         state->buf = talloc_array(state, uint8_t, ret);
 797         if (tevent_req_nomem(state->buf, req)) {
 798                 return;
 799         }
 800         state->len = ret;
 801
 802         state->src = tsocket_address_create(state,
 803                                             &tsocket_address_bsd_ops,
 804                                             &bsda,
 805                                             struct tsocket_address_bsd,
 806                                             __location__ "bsd_recvfrom");
 807         if (tevent_req_nomem(state->src, req)) {
 808                 return;
 809         }
 810
 811         ZERO_STRUCTP(bsda);
 812
 813         sa = &bsda->u.sa;
 814         sa_len = sizeof(bsda->u.ss);
 815
 816         ret = recvfrom(bsds->fd, state->buf, state->len, 0, sa, &sa_len);
 817         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 818         if (retry) {
 819                 /* retry later */
 820                 return;
 821         }
 822         if (tevent_req_error(req, err)) {
 823                 return;
 824         }
 825
 826         if (ret != state->len) {
 827                 tevent_req_error(req, EIO);
 828                 return;
 829         }
 830
 831         tevent_req_done(req);
 832 }
 833
 834 static ssize_t tdgram_bsd_recvfrom_recv(struct tevent_req *req,
 835                                         int *perrno,
 836                                         TALLOC_CTX *mem_ctx,
 837                                         uint8_t **buf,
 838                                         struct tsocket_address **src)
 839 {
 840         struct tdgram_bsd_recvfrom_state *state = tevent_req_data(req,
 841                                         struct tdgram_bsd_recvfrom_state);
 842         ssize_t ret;
 843
 844         ret = tsocket_simple_int_recv(req, perrno);
 845         if (ret == 0) {
 846                 *buf = talloc_move(mem_ctx, &state->buf);
 847                 ret = state->len;
 848                 if (src) {
 849                         *src = talloc_move(mem_ctx, &state->src);
 850                 }
 851         }
 852
 853         tevent_req_received(req);
 854         return ret;
 855 }
 856
 857 struct tdgram_bsd_sendto_state {
 858         struct tdgram_context *dgram;
 859
 860         const uint8_t *buf;
 861         size_t len;
 862         const struct tsocket_address *dst;
 863
 864         ssize_t ret;
 865 };
 866
 867 static int tdgram_bsd_sendto_destructor(struct tdgram_bsd_sendto_state *state)
 868 {
 869         struct tdgram_bsd *bsds = tdgram_context_data(state->dgram,
 870                                   struct tdgram_bsd);
 871
 872         bsds->write_req = NULL;
 873         tdgram_bsd_set_writeable_handler(bsds, NULL, NULL, NULL);
 874         return 0;
 875 }
 876
 877 static void tdgram_bsd_sendto_handler(void *private_data);
 878
 879 static struct tevent_req *tdgram_bsd_sendto_send(TALLOC_CTX *mem_ctx,
 880                                                  struct tevent_context *ev,
 881                                                  struct tdgram_context *dgram,
 882                                                  const uint8_t *buf,
 883                                                  size_t len,
 884                                                  const struct tsocket_address *dst)
 885 {
 886         struct tevent_req *req;
 887         struct tdgram_bsd_sendto_state *state;
 888         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 889         int ret;
 890
 891         req = tevent_req_create(mem_ctx, &state,
 892                                 struct tdgram_bsd_sendto_state);
 893         if (!req) {
 894                 return NULL;
 895         }
 896
 897         state->dgram    = dgram;
 898         state->buf      = buf;
 899         state->len      = len;
 900         state->dst      = dst;
 901         state->ret      = -1;
 902
 903         if (bsds->write_req) {
 904                 tevent_req_error(req, EBUSY);
 905                 goto post;
 906         }
 907         bsds->write_req = req;
 908
 909         talloc_set_destructor(state, tdgram_bsd_sendto_destructor);
 910
 911         if (bsds->fd == -1) {
 912                 tevent_req_error(req, ENOTCONN);
 913                 goto post;
 914         }
 915
 916         /*
 917          * this is a fast path, not waiting for the
 918          * socket to become explicit writeable gains
 919          * about 10%-20% performance in benchmark tests.
 920          */
 921         tdgram_bsd_sendto_handler(req);
 922         if (!tevent_req_is_in_progress(req)) {
 923                 goto post;
 924         }
 925
 926         ret = tdgram_bsd_set_writeable_handler(bsds, ev,
 927                                                tdgram_bsd_sendto_handler,
 928                                                req);
 929         if (ret == -1) {
 930                 tevent_req_error(req, errno);
 931                 goto post;
 932         }
 933
 934         return req;
 935
 936  post:
 937         tevent_req_post(req, ev);
 938         return req;
 939 }
 940
 941 static void tdgram_bsd_sendto_handler(void *private_data)
 942 {
 943         struct tevent_req *req = talloc_get_type_abort(private_data,
 944                                  struct tevent_req);
 945         struct tdgram_bsd_sendto_state *state = tevent_req_data(req,
 946                                         struct tdgram_bsd_sendto_state);
 947         struct tdgram_context *dgram = state->dgram;
 948         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 949         struct sockaddr *sa = NULL;
 950         socklen_t sa_len = 0;
 951         ssize_t ret;
 952         int err;
 953         bool retry;
 954
 955         if (state->dst) {
 956                 struct tsocket_address_bsd *bsda =
 957                         talloc_get_type(state->dst->private_data,
 958                         struct tsocket_address_bsd);
 959
 960                 sa = &bsda->u.sa;
 961                 sa_len = sizeof(bsda->u.ss);
 962         }
 963
 964         ret = sendto(bsds->fd, state->buf, state->len, 0, sa, sa_len);
 965         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 966         if (retry) {
 967                 /* retry later */
 968                 return;
 969         }
 970         if (tevent_req_error(req, err)) {
 971                 return;
 972         }
 973
 974         state->ret = ret;
 975
 976         tevent_req_done(req);
 977 }
 978
 979 static ssize_t tdgram_bsd_sendto_recv(struct tevent_req *req, int *perrno)
 980 {
 981         struct tdgram_bsd_sendto_state *state = tevent_req_data(req,
 982                                         struct tdgram_bsd_sendto_state);
 983         ssize_t ret;
 984
 985         ret = tsocket_simple_int_recv(req, perrno);
 986         if (ret == 0) {
 987                 ret = state->ret;
 988         }
 989
 990         tevent_req_received(req);
 991         return ret;
 992 }
 993
 994 struct tdgram_bsd_disconnect_state {
 995         uint8_t __dummy;
 996 };
 997
 998 static struct tevent_req *tdgram_bsd_disconnect_send(TALLOC_CTX *mem_ctx,
 999                                                      struct tevent_context *ev,
1000                                                      struct tdgram_context *dgram)
1001 {
1002         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
1003         struct tevent_req *req;
1004         struct tdgram_bsd_disconnect_state *state;
1005         int ret;
1006         int err;
1007         bool dummy;
1008
1009         req = tevent_req_create(mem_ctx, &state,
1010                                 struct tdgram_bsd_disconnect_state);
1011         if (req == NULL) {
1012                 return NULL;
1013         }
1014
1015         if (bsds->read_req || bsds->write_req) {
1016                 tevent_req_error(req, EBUSY);
1017                 goto post;
1018         }
1019
1020         if (bsds->fd == -1) {
1021                 tevent_req_error(req, ENOTCONN);
1022                 goto post;
1023         }
1024
1025         ret = close(bsds->fd);
1026         bsds->fd = -1;
1027         err = tsocket_bsd_error_from_errno(ret, errno, &dummy);
1028         if (tevent_req_error(req, err)) {
1029                 goto post;
1030         }
1031
1032         tevent_req_done(req);
1033 post:
1034         tevent_req_post(req, ev);
1035         return req;
1036 }
1037
1038 static int tdgram_bsd_disconnect_recv(struct tevent_req *req,
1039                                       int *perrno)
1040 {
1041         int ret;
1042
1043         ret = tsocket_simple_int_recv(req, perrno);
1044
1045         tevent_req_received(req);
1046         return ret;
1047 }
1048
1049 static const struct tdgram_context_ops tdgram_bsd_ops = {
1050         .name                   = "bsd",
1051
1052         .recvfrom_send          = tdgram_bsd_recvfrom_send,
1053         .recvfrom_recv          = tdgram_bsd_recvfrom_recv,
1054
1055         .sendto_send            = tdgram_bsd_sendto_send,
1056         .sendto_recv            = tdgram_bsd_sendto_recv,
1057
1058         .disconnect_send        = tdgram_bsd_disconnect_send,
1059         .disconnect_recv        = tdgram_bsd_disconnect_recv,
1060 };
1061
1062 static int tdgram_bsd_destructor(struct tdgram_bsd *bsds)
1063 {
1064         TALLOC_FREE(bsds->fde);
1065         if (bsds->fd != -1) {
1066                 close(bsds->fd);
1067                 bsds->fd = -1;
1068         }
1069         return 0;
1070 }
1071
1072 static int tdgram_bsd_dgram_socket(const struct tsocket_address *local,
1073                                    const struct tsocket_address *remote,
1074                                    bool broadcast,
1075                                    TALLOC_CTX *mem_ctx,
1076                                    struct tdgram_context **_dgram,
1077                                    const char *location)
1078 {
1079         struct tsocket_address_bsd *lbsda =
1080                 talloc_get_type_abort(local->private_data,
1081                 struct tsocket_address_bsd);
1082         struct tsocket_address_bsd *rbsda = NULL;
1083         struct tdgram_context *dgram;
1084         struct tdgram_bsd *bsds;
1085         int fd;
1086         int ret;
1087         bool do_bind = false;
1088         bool do_reuseaddr = false;
1089
1090         if (remote) {
1091                 rbsda = talloc_get_type_abort(remote->private_data,
1092                         struct tsocket_address_bsd);
1093         }
1094
1095         switch (lbsda->u.sa.sa_family) {
1096         case AF_UNIX:
1097                 if (broadcast) {
1098                         errno = EINVAL;
1099                         return -1;
1100                 }
1101                 if (lbsda->u.un.sun_path[0] != 0) {
1102                         do_reuseaddr = true;
1103                         do_bind = true;
1104                 }
1105                 break;
1106         case AF_INET:
1107                 if (lbsda->u.in.sin_port != 0) {
1108                         do_reuseaddr = true;
1109                         do_bind = true;
1110                 }
1111                 if (lbsda->u.in.sin_addr.s_addr == INADDR_ANY) {
1112                         do_bind = true;
1113                 }
1114                 break;
1115 #ifdef HAVE_IPV6
1116         case AF_INET6:
1117                 if (lbsda->u.in6.sin6_port != 0) {
1118                         do_reuseaddr = true;
1119                         do_bind = true;
1120                 }
1121                 if (memcmp(&in6addr_any,
1122                            &lbsda->u.in6.sin6_addr,
1123                            sizeof(in6addr_any)) != 0) {
1124                         do_bind = true;
1125                 }
1126                 break;
1127 #endif
1128         default:
1129                 errno = EINVAL;
1130                 return -1;
1131         }
1132
1133         fd = socket(lbsda->u.sa.sa_family, SOCK_DGRAM, 0);
1134         if (fd < 0) {
1135                 return fd;
1136         }
1137
1138         fd = tsocket_bsd_common_prepare_fd(fd, true);
1139         if (fd < 0) {
1140                 return fd;
1141         }
1142
1143         dgram = tdgram_context_create(mem_ctx,
1144                                       &tdgram_bsd_ops,
1145                                       &bsds,
1146                                       struct tdgram_bsd,
1147                                       location);
1148         if (!dgram) {
1149                 int saved_errno = errno;
1150                 close(fd);
1151                 errno = saved_errno;
1152                 return -1;
1153         }
1154         ZERO_STRUCTP(bsds);
1155         bsds->fd = fd;
1156         talloc_set_destructor(bsds, tdgram_bsd_destructor);
1157
1158         if (broadcast) {
1159                 int val = 1;
1160
1161                 ret = setsockopt(fd, SOL_SOCKET, SO_BROADCAST,
1162                                  (const void *)&val, sizeof(val));
1163                 if (ret == -1) {
1164                         int saved_errno = errno;
1165                         talloc_free(dgram);
1166                         errno = saved_errno;
1167                         return ret;
1168                 }
1169         }
1170
1171         if (do_reuseaddr) {
1172                 int val = 1;
1173
1174                 ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
1175                                  (const void *)&val, sizeof(val));
1176                 if (ret == -1) {
1177                         int saved_errno = errno;
1178                         talloc_free(dgram);
1179                         errno = saved_errno;
1180                         return ret;
1181                 }
1182         }
1183
1184         if (do_bind) {
1185                 ret = bind(fd, &lbsda->u.sa, sizeof(lbsda->u.ss));
1186                 if (ret == -1) {
1187                         int saved_errno = errno;
1188                         talloc_free(dgram);
1189                         errno = saved_errno;
1190                         return ret;
1191                 }
1192         }
1193
1194         if (rbsda) {
1195                 ret = connect(fd, &rbsda->u.sa, sizeof(rbsda->u.ss));
1196                 if (ret == -1) {
1197                         int saved_errno = errno;
1198                         talloc_free(dgram);
1199                         errno = saved_errno;
1200                         return ret;
1201                 }
1202         }
1203
1204         *_dgram = dgram;
1205         return 0;
1206 }
1207
1208 int _tdgram_inet_udp_socket(const struct tsocket_address *local,
1209                             const struct tsocket_address *remote,
1210                             TALLOC_CTX *mem_ctx,
1211                             struct tdgram_context **dgram,
1212                             const char *location)
1213 {
1214         struct tsocket_address_bsd *lbsda =
1215                 talloc_get_type_abort(local->private_data,
1216                 struct tsocket_address_bsd);
1217         int ret;
1218
1219         switch (lbsda->u.sa.sa_family) {
1220         case AF_INET:
1221                 break;
1222 #ifdef HAVE_IPV6
1223         case AF_INET6:
1224                 break;
1225 #endif
1226         default:
1227                 errno = EINVAL;
1228                 return -1;
1229         }
1230
1231         ret = tdgram_bsd_dgram_socket(local, remote, false,
1232                                       mem_ctx, dgram, location);
1233
1234         return ret;
1235 }
1236
1237 int _tdgram_unix_dgram_socket(const struct tsocket_address *local,
1238                               const struct tsocket_address *remote,
1239                               TALLOC_CTX *mem_ctx,
1240                               struct tdgram_context **dgram,
1241                               const char *location)
1242 {
1243         struct tsocket_address_bsd *lbsda =
1244                 talloc_get_type_abort(local->private_data,
1245                 struct tsocket_address_bsd);
1246         int ret;
1247
1248         switch (lbsda->u.sa.sa_family) {
1249         case AF_UNIX:
1250                 break;
1251         default:
1252                 errno = EINVAL;
1253                 return -1;
1254         }
1255
1256         ret = tdgram_bsd_dgram_socket(local, remote, false,
1257                                       mem_ctx, dgram, location);
1258
1259         return ret;
1260 }
1261