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
 562 static void tdgram_bsd_fde_handler(struct tevent_context *ev,
 563                                    struct tevent_fd *fde,
 564                                    uint16_t flags,
 565                                    void *private_data)
 566 {
 567         struct tdgram_bsd *bsds = talloc_get_type_abort(private_data,
 568                                   struct tdgram_bsd);
 569
 570         if (flags & TEVENT_FD_WRITE) {
 571                 bsds->writeable_handler(bsds->writeable_private);
 572                 return;
 573         }
 574         if (flags & TEVENT_FD_READ) {
 575                 if (!bsds->readable_handler) {
 576                         TEVENT_FD_NOT_READABLE(bsds->fde);
 577                         return;
 578                 }
 579                 bsds->readable_handler(bsds->readable_private);
 580                 return;
 581         }
 582 }
 583
 584 static int tdgram_bsd_set_readable_handler(struct tdgram_bsd *bsds,
 585                                            struct tevent_context *ev,
 586                                            void (*handler)(void *private_data),
 587                                            void *private_data)
 588 {
 589         if (ev == NULL) {
 590                 if (handler) {
 591                         errno = EINVAL;
 592                         return -1;
 593                 }
 594                 if (!bsds->readable_handler) {
 595                         return 0;
 596                 }
 597                 bsds->readable_handler = NULL;
 598                 bsds->readable_private = NULL;
 599
 600                 return 0;
 601         }
 602
 603         /* read and write must use the same tevent_context */
 604         if (bsds->event_ptr != ev) {
 605                 if (bsds->readable_handler || bsds->writeable_handler) {
 606                         errno = EINVAL;
 607                         return -1;
 608                 }
 609                 bsds->event_ptr = NULL;
 610                 TALLOC_FREE(bsds->fde);
 611         }
 612
 613         if (bsds->fde == NULL) {
 614                 bsds->fde = tevent_add_fd(ev, bsds,
 615                                           bsds->fd, TEVENT_FD_READ,
 616                                           tdgram_bsd_fde_handler,
 617                                           bsds);
 618                 if (!bsds->fde) {
 619                         return -1;
 620                 }
 621
 622                 /* cache the event context we're running on */
 623                 bsds->event_ptr = ev;
 624         } else if (!bsds->readable_handler) {
 625                 TEVENT_FD_READABLE(bsds->fde);
 626         }
 627
 628         bsds->readable_handler = handler;
 629         bsds->readable_private = private_data;
 630
 631         return 0;
 632 }
 633
 634 static int tdgram_bsd_set_writeable_handler(struct tdgram_bsd *bsds,
 635                                             struct tevent_context *ev,
 636                                             void (*handler)(void *private_data),
 637                                             void *private_data)
 638 {
 639         if (ev == NULL) {
 640                 if (handler) {
 641                         errno = EINVAL;
 642                         return -1;
 643                 }
 644                 if (!bsds->writeable_handler) {
 645                         return 0;
 646                 }
 647                 bsds->writeable_handler = NULL;
 648                 bsds->writeable_private = NULL;
 649                 TEVENT_FD_NOT_WRITEABLE(bsds->fde);
 650
 651                 return 0;
 652         }
 653
 654         /* read and write must use the same tevent_context */
 655         if (bsds->event_ptr != ev) {
 656                 if (bsds->readable_handler || bsds->writeable_handler) {
 657                         errno = EINVAL;
 658                         return -1;
 659                 }
 660                 bsds->event_ptr = NULL;
 661                 TALLOC_FREE(bsds->fde);
 662         }
 663
 664         if (bsds->fde == NULL) {
 665                 bsds->fde = tevent_add_fd(ev, bsds,
 666                                           bsds->fd, TEVENT_FD_WRITE,
 667                                           tdgram_bsd_fde_handler,
 668                                           bsds);
 669                 if (!bsds->fde) {
 670                         return -1;
 671                 }
 672
 673                 /* cache the event context we're running on */
 674                 bsds->event_ptr = ev;
 675         } else if (!bsds->writeable_handler) {
 676                 TEVENT_FD_WRITEABLE(bsds->fde);
 677         }
 678
 679         bsds->writeable_handler = handler;
 680         bsds->writeable_private = private_data;
 681
 682         return 0;
 683 }
 684
 685 struct tdgram_bsd_recvfrom_state {
 686         struct tdgram_context *dgram;
 687
 688         uint8_t *buf;
 689         size_t len;
 690         struct tsocket_address *src;
 691 };
 692
 693 static int tdgram_bsd_recvfrom_destructor(struct tdgram_bsd_recvfrom_state *state)
 694 {
 695         struct tdgram_bsd *bsds = tdgram_context_data(state->dgram,
 696                                   struct tdgram_bsd);
 697
 698         tdgram_bsd_set_readable_handler(bsds, NULL, NULL, NULL);
 699
 700         return 0;
 701 }
 702
 703 static void tdgram_bsd_recvfrom_handler(void *private_data);
 704
 705 static struct tevent_req *tdgram_bsd_recvfrom_send(TALLOC_CTX *mem_ctx,
 706                                         struct tevent_context *ev,
 707                                         struct tdgram_context *dgram)
 708 {
 709         struct tevent_req *req;
 710         struct tdgram_bsd_recvfrom_state *state;
 711         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 712         int ret;
 713
 714         req = tevent_req_create(mem_ctx, &state,
 715                                 struct tdgram_bsd_recvfrom_state);
 716         if (!req) {
 717                 return NULL;
 718         }
 719
 720         state->dgram    = dgram;
 721         state->buf      = NULL;
 722         state->len      = 0;
 723         state->src      = NULL;
 724
 725         talloc_set_destructor(state, tdgram_bsd_recvfrom_destructor);
 726
 727         if (bsds->fd == -1) {
 728                 tevent_req_error(req, ENOTCONN);
 729                 goto post;
 730         }
 731
 732         /*
 733          * this is a fast path, not waiting for the
 734          * socket to become explicit readable gains
 735          * about 10%-20% performance in benchmark tests.
 736          */
 737         tdgram_bsd_recvfrom_handler(req);
 738         if (!tevent_req_is_in_progress(req)) {
 739                 goto post;
 740         }
 741
 742         ret = tdgram_bsd_set_readable_handler(bsds, ev,
 743                                               tdgram_bsd_recvfrom_handler,
 744                                               req);
 745         if (ret == -1) {
 746                 tevent_req_error(req, errno);
 747                 goto post;
 748         }
 749
 750         return req;
 751
 752  post:
 753         tevent_req_post(req, ev);
 754         return req;
 755 }
 756
 757 static void tdgram_bsd_recvfrom_handler(void *private_data)
 758 {
 759         struct tevent_req *req = talloc_get_type_abort(private_data,
 760                                  struct tevent_req);
 761         struct tdgram_bsd_recvfrom_state *state = tevent_req_data(req,
 762                                         struct tdgram_bsd_recvfrom_state);
 763         struct tdgram_context *dgram = state->dgram;
 764         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 765         struct tsocket_address_bsd *bsda;
 766         ssize_t ret;
 767         struct sockaddr *sa = NULL;
 768         socklen_t sa_len = 0;
 769         int err;
 770         bool retry;
 771
 772         ret = tsocket_bsd_pending(bsds->fd);
 773         if (ret == 0) {
 774                 /* retry later */
 775                 return;
 776         }
 777         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 778         if (retry) {
 779                 /* retry later */
 780                 return;
 781         }
 782         if (tevent_req_error(req, err)) {
 783                 return;
 784         }
 785
 786         state->buf = talloc_array(state, uint8_t, ret);
 787         if (tevent_req_nomem(state->buf, req)) {
 788                 return;
 789         }
 790         state->len = ret;
 791
 792         state->src = tsocket_address_create(state,
 793                                             &tsocket_address_bsd_ops,
 794                                             &bsda,
 795                                             struct tsocket_address_bsd,
 796                                             __location__ "bsd_recvfrom");
 797         if (tevent_req_nomem(state->src, req)) {
 798                 return;
 799         }
 800
 801         ZERO_STRUCTP(bsda);
 802
 803         sa = &bsda->u.sa;
 804         sa_len = sizeof(bsda->u.ss);
 805         /*
 806          * for unix sockets we can't use the size of sockaddr_storage
 807          * we would get EINVAL
 808          */
 809         if (bsda->u.sa.sa_family == AF_UNIX) {
 810                 sa_len = sizeof(bsda->u.un);
 811         }
 812
 813         ret = recvfrom(bsds->fd, state->buf, state->len, 0, sa, &sa_len);
 814         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 815         if (retry) {
 816                 /* retry later */
 817                 return;
 818         }
 819         if (tevent_req_error(req, err)) {
 820                 return;
 821         }
 822
 823         if (ret != state->len) {
 824                 tevent_req_error(req, EIO);
 825                 return;
 826         }
 827
 828         tevent_req_done(req);
 829 }
 830
 831 static ssize_t tdgram_bsd_recvfrom_recv(struct tevent_req *req,
 832                                         int *perrno,
 833                                         TALLOC_CTX *mem_ctx,
 834                                         uint8_t **buf,
 835                                         struct tsocket_address **src)
 836 {
 837         struct tdgram_bsd_recvfrom_state *state = tevent_req_data(req,
 838                                         struct tdgram_bsd_recvfrom_state);
 839         ssize_t ret;
 840
 841         ret = tsocket_simple_int_recv(req, perrno);
 842         if (ret == 0) {
 843                 *buf = talloc_move(mem_ctx, &state->buf);
 844                 ret = state->len;
 845                 if (src) {
 846                         *src = talloc_move(mem_ctx, &state->src);
 847                 }
 848         }
 849
 850         tevent_req_received(req);
 851         return ret;
 852 }
 853
 854 struct tdgram_bsd_sendto_state {
 855         struct tdgram_context *dgram;
 856
 857         const uint8_t *buf;
 858         size_t len;
 859         const struct tsocket_address *dst;
 860
 861         ssize_t ret;
 862 };
 863
 864 static int tdgram_bsd_sendto_destructor(struct tdgram_bsd_sendto_state *state)
 865 {
 866         struct tdgram_bsd *bsds = tdgram_context_data(state->dgram,
 867                                   struct tdgram_bsd);
 868
 869         tdgram_bsd_set_writeable_handler(bsds, NULL, NULL, NULL);
 870
 871         return 0;
 872 }
 873
 874 static void tdgram_bsd_sendto_handler(void *private_data);
 875
 876 static struct tevent_req *tdgram_bsd_sendto_send(TALLOC_CTX *mem_ctx,
 877                                                  struct tevent_context *ev,
 878                                                  struct tdgram_context *dgram,
 879                                                  const uint8_t *buf,
 880                                                  size_t len,
 881                                                  const struct tsocket_address *dst)
 882 {
 883         struct tevent_req *req;
 884         struct tdgram_bsd_sendto_state *state;
 885         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 886         int ret;
 887
 888         req = tevent_req_create(mem_ctx, &state,
 889                                 struct tdgram_bsd_sendto_state);
 890         if (!req) {
 891                 return NULL;
 892         }
 893
 894         state->dgram    = dgram;
 895         state->buf      = buf;
 896         state->len      = len;
 897         state->dst      = dst;
 898         state->ret      = -1;
 899
 900         talloc_set_destructor(state, tdgram_bsd_sendto_destructor);
 901
 902         if (bsds->fd == -1) {
 903                 tevent_req_error(req, ENOTCONN);
 904                 goto post;
 905         }
 906
 907         /*
 908          * this is a fast path, not waiting for the
 909          * socket to become explicit writeable gains
 910          * about 10%-20% performance in benchmark tests.
 911          */
 912         tdgram_bsd_sendto_handler(req);
 913         if (!tevent_req_is_in_progress(req)) {
 914                 goto post;
 915         }
 916
 917         ret = tdgram_bsd_set_writeable_handler(bsds, ev,
 918                                                tdgram_bsd_sendto_handler,
 919                                                req);
 920         if (ret == -1) {
 921                 tevent_req_error(req, errno);
 922                 goto post;
 923         }
 924
 925         return req;
 926
 927  post:
 928         tevent_req_post(req, ev);
 929         return req;
 930 }
 931
 932 static void tdgram_bsd_sendto_handler(void *private_data)
 933 {
 934         struct tevent_req *req = talloc_get_type_abort(private_data,
 935                                  struct tevent_req);
 936         struct tdgram_bsd_sendto_state *state = tevent_req_data(req,
 937                                         struct tdgram_bsd_sendto_state);
 938         struct tdgram_context *dgram = state->dgram;
 939         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 940         struct sockaddr *sa = NULL;
 941         socklen_t sa_len = 0;
 942         ssize_t ret;
 943         int err;
 944         bool retry;
 945
 946         if (state->dst) {
 947                 struct tsocket_address_bsd *bsda =
 948                         talloc_get_type(state->dst->private_data,
 949                         struct tsocket_address_bsd);
 950
 951                 sa = &bsda->u.sa;
 952                 sa_len = sizeof(bsda->u.ss);
 953                 /*
 954                  * for unix sockets we can't use the size of sockaddr_storage
 955                  * we would get EINVAL
 956                  */
 957                 if (bsda->u.sa.sa_family == AF_UNIX) {
 958                         sa_len = sizeof(bsda->u.un);
 959                 }
 960         }
 961
 962         ret = sendto(bsds->fd, state->buf, state->len, 0, sa, sa_len);
 963         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 964         if (retry) {
 965                 /* retry later */
 966                 return;
 967         }
 968         if (tevent_req_error(req, err)) {
 969                 return;
 970         }
 971
 972         state->ret = ret;
 973
 974         tevent_req_done(req);
 975 }
 976
 977 static ssize_t tdgram_bsd_sendto_recv(struct tevent_req *req, int *perrno)
 978 {
 979         struct tdgram_bsd_sendto_state *state = tevent_req_data(req,
 980                                         struct tdgram_bsd_sendto_state);
 981         ssize_t ret;
 982
 983         ret = tsocket_simple_int_recv(req, perrno);
 984         if (ret == 0) {
 985                 ret = state->ret;
 986         }
 987
 988         tevent_req_received(req);
 989         return ret;
 990 }
 991
 992 struct tdgram_bsd_disconnect_state {
 993         uint8_t __dummy;
 994 };
 995
 996 static struct tevent_req *tdgram_bsd_disconnect_send(TALLOC_CTX *mem_ctx,
 997                                                      struct tevent_context *ev,
 998                                                      struct tdgram_context *dgram)
 999 {
1000         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
1001         struct tevent_req *req;
1002         struct tdgram_bsd_disconnect_state *state;
1003         int ret;
1004         int err;
1005         bool dummy;
1006
1007         req = tevent_req_create(mem_ctx, &state,
1008                                 struct tdgram_bsd_disconnect_state);
1009         if (req == NULL) {
1010                 return NULL;
1011         }
1012
1013         if (bsds->fd == -1) {
1014                 tevent_req_error(req, ENOTCONN);
1015                 goto post;
1016         }
1017
1018         ret = close(bsds->fd);
1019         bsds->fd = -1;
1020         err = tsocket_bsd_error_from_errno(ret, errno, &dummy);
1021         if (tevent_req_error(req, err)) {
1022                 goto post;
1023         }
1024
1025         tevent_req_done(req);
1026 post:
1027         tevent_req_post(req, ev);
1028         return req;
1029 }
1030
1031 static int tdgram_bsd_disconnect_recv(struct tevent_req *req,
1032                                       int *perrno)
1033 {
1034         int ret;
1035
1036         ret = tsocket_simple_int_recv(req, perrno);
1037
1038         tevent_req_received(req);
1039         return ret;
1040 }
1041
1042 static const struct tdgram_context_ops tdgram_bsd_ops = {
1043         .name                   = "bsd",
1044
1045         .recvfrom_send          = tdgram_bsd_recvfrom_send,
1046         .recvfrom_recv          = tdgram_bsd_recvfrom_recv,
1047
1048         .sendto_send            = tdgram_bsd_sendto_send,
1049         .sendto_recv            = tdgram_bsd_sendto_recv,
1050
1051         .disconnect_send        = tdgram_bsd_disconnect_send,
1052         .disconnect_recv        = tdgram_bsd_disconnect_recv,
1053 };
1054
1055 static int tdgram_bsd_destructor(struct tdgram_bsd *bsds)
1056 {
1057         TALLOC_FREE(bsds->fde);
1058         if (bsds->fd != -1) {
1059                 close(bsds->fd);
1060                 bsds->fd = -1;
1061         }
1062         return 0;
1063 }
1064
1065 static int tdgram_bsd_dgram_socket(const struct tsocket_address *local,
1066                                    const struct tsocket_address *remote,
1067                                    bool broadcast,
1068                                    TALLOC_CTX *mem_ctx,
1069                                    struct tdgram_context **_dgram,
1070                                    const char *location)
1071 {
1072         struct tsocket_address_bsd *lbsda =
1073                 talloc_get_type_abort(local->private_data,
1074                 struct tsocket_address_bsd);
1075         struct tsocket_address_bsd *rbsda = NULL;
1076         struct tdgram_context *dgram;
1077         struct tdgram_bsd *bsds;
1078         int fd;
1079         int ret;
1080         bool do_bind = false;
1081         bool do_reuseaddr = false;
1082         socklen_t sa_len = sizeof(lbsda->u.ss);
1083
1084         if (remote) {
1085                 rbsda = talloc_get_type_abort(remote->private_data,
1086                         struct tsocket_address_bsd);
1087         }
1088
1089         switch (lbsda->u.sa.sa_family) {
1090         case AF_UNIX:
1091                 if (broadcast) {
1092                         errno = EINVAL;
1093                         return -1;
1094                 }
1095                 if (lbsda->u.un.sun_path[0] != 0) {
1096                         do_reuseaddr = true;
1097                         do_bind = true;
1098                 }
1099                 /*
1100                  * for unix sockets we can't use the size of sockaddr_storage
1101                  * we would get EINVAL
1102                  */
1103                 sa_len = sizeof(lbsda->u.un);
1104                 break;
1105         case AF_INET:
1106                 if (lbsda->u.in.sin_port != 0) {
1107                         do_reuseaddr = true;
1108                         do_bind = true;
1109                 }
1110                 if (lbsda->u.in.sin_addr.s_addr == INADDR_ANY) {
1111                         do_bind = true;
1112                 }
1113                 break;
1114 #ifdef HAVE_IPV6
1115         case AF_INET6:
1116                 if (lbsda->u.in6.sin6_port != 0) {
1117                         do_reuseaddr = true;
1118                         do_bind = true;
1119                 }
1120                 if (memcmp(&in6addr_any,
1121                            &lbsda->u.in6.sin6_addr,
1122                            sizeof(in6addr_any)) != 0) {
1123                         do_bind = true;
1124                 }
1125                 break;
1126 #endif
1127         default:
1128                 errno = EINVAL;
1129                 return -1;
1130         }
1131
1132         fd = socket(lbsda->u.sa.sa_family, SOCK_DGRAM, 0);
1133         if (fd < 0) {
1134                 return fd;
1135         }
1136
1137         fd = tsocket_bsd_common_prepare_fd(fd, true);
1138         if (fd < 0) {
1139                 return fd;
1140         }
1141
1142         dgram = tdgram_context_create(mem_ctx,
1143                                       &tdgram_bsd_ops,
1144                                       &bsds,
1145                                       struct tdgram_bsd,
1146                                       location);
1147         if (!dgram) {
1148                 int saved_errno = errno;
1149                 close(fd);
1150                 errno = saved_errno;
1151                 return -1;
1152         }
1153         ZERO_STRUCTP(bsds);
1154         bsds->fd = fd;
1155         talloc_set_destructor(bsds, tdgram_bsd_destructor);
1156
1157         if (broadcast) {
1158                 int val = 1;
1159
1160                 ret = setsockopt(fd, SOL_SOCKET, SO_BROADCAST,
1161                                  (const void *)&val, sizeof(val));
1162                 if (ret == -1) {
1163                         int saved_errno = errno;
1164                         talloc_free(dgram);
1165                         errno = saved_errno;
1166                         return ret;
1167                 }
1168         }
1169
1170         if (do_reuseaddr) {
1171                 int val = 1;
1172
1173                 ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
1174                                  (const void *)&val, sizeof(val));
1175                 if (ret == -1) {
1176                         int saved_errno = errno;
1177                         talloc_free(dgram);
1178                         errno = saved_errno;
1179                         return ret;
1180                 }
1181         }
1182
1183         if (do_bind) {
1184                 ret = bind(fd, &lbsda->u.sa, sa_len);
1185                 if (ret == -1) {
1186                         int saved_errno = errno;
1187                         talloc_free(dgram);
1188                         errno = saved_errno;
1189                         return ret;
1190                 }
1191         }
1192
1193         if (rbsda) {
1194                 ret = connect(fd, &rbsda->u.sa, sa_len);
1195                 if (ret == -1) {
1196                         int saved_errno = errno;
1197                         talloc_free(dgram);
1198                         errno = saved_errno;
1199                         return ret;
1200                 }
1201         }
1202
1203         *_dgram = dgram;
1204         return 0;
1205 }
1206
1207 int _tdgram_inet_udp_socket(const struct tsocket_address *local,
1208                             const struct tsocket_address *remote,
1209                             TALLOC_CTX *mem_ctx,
1210                             struct tdgram_context **dgram,
1211                             const char *location)
1212 {
1213         struct tsocket_address_bsd *lbsda =
1214                 talloc_get_type_abort(local->private_data,
1215                 struct tsocket_address_bsd);
1216         int ret;
1217
1218         switch (lbsda->u.sa.sa_family) {
1219         case AF_INET:
1220                 break;
1221 #ifdef HAVE_IPV6
1222         case AF_INET6:
1223                 break;
1224 #endif
1225         default:
1226                 errno = EINVAL;
1227                 return -1;
1228         }
1229
1230         ret = tdgram_bsd_dgram_socket(local, remote, false,
1231                                       mem_ctx, dgram, location);
1232
1233         return ret;
1234 }
1235
1236 int _tdgram_unix_socket(const struct tsocket_address *local,
1237                         const struct tsocket_address *remote,
1238                         TALLOC_CTX *mem_ctx,
1239                         struct tdgram_context **dgram,
1240                         const char *location)
1241 {
1242         struct tsocket_address_bsd *lbsda =
1243                 talloc_get_type_abort(local->private_data,
1244                 struct tsocket_address_bsd);
1245         int ret;
1246
1247         switch (lbsda->u.sa.sa_family) {
1248         case AF_UNIX:
1249                 break;
1250         default:
1251                 errno = EINVAL;
1252                 return -1;
1253         }
1254
1255         ret = tdgram_bsd_dgram_socket(local, remote, false,
1256                                       mem_ctx, dgram, location);
1257
1258         return ret;
1259 }
1260