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 tsocket
   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, error;
 153         int value = 0;
 154         socklen_t len;
 155
 156         ret = ioctl(fd, FIONREAD, &value);
 157         if (ret == -1) {
 158                 return ret;
 159         }
 160
 161         if (ret != 0) {
 162                 /* this should not be reached */
 163                 errno = EIO;
 164                 return -1;
 165         }
 166
 167         if (value != 0) {
 168                 return value;
 169         }
 170
 171         error = 0;
 172         len = sizeof(error);
 173
 174         /*
 175          * if no data is available check if the socket is in error state. For
 176          * dgram sockets it's the way to return ICMP error messages of
 177          * connected sockets to the caller.
 178          */
 179         ret = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len);
 180         if (ret == -1) {
 181                 return ret;
 182         }
 183         if (error != 0) {
 184                 errno = error;
 185                 return -1;
 186         }
 187         return 0;
 188 }
 189
 190 static const struct tsocket_address_ops tsocket_address_bsd_ops;
 191
 192 struct tsocket_address_bsd {
 193         union {
 194                 struct sockaddr sa;
 195                 struct sockaddr_in in;
 196 #ifdef HAVE_IPV6
 197                 struct sockaddr_in6 in6;
 198 #endif
 199                 struct sockaddr_un un;
 200                 struct sockaddr_storage ss;
 201         } u;
 202 };
 203
 204 int _tsocket_address_bsd_from_sockaddr(TALLOC_CTX *mem_ctx,
 205                                        struct sockaddr *sa,
 206                                        size_t sa_socklen,
 207                                        struct tsocket_address **_addr,
 208                                        const char *location)
 209 {
 210         struct tsocket_address *addr;
 211         struct tsocket_address_bsd *bsda;
 212
 213         if (sa_socklen < sizeof(sa->sa_family)) {
 214                 errno = EINVAL;
 215                 return -1;
 216         }
 217
 218         switch (sa->sa_family) {
 219         case AF_UNIX:
 220                 if (sa_socklen > sizeof(struct sockaddr_un)) {
 221                         sa_socklen = sizeof(struct sockaddr_un);
 222                 }
 223                 break;
 224         case AF_INET:
 225                 if (sa_socklen < sizeof(struct sockaddr_in)) {
 226                         errno = EINVAL;
 227                         return -1;
 228                 }
 229                 sa_socklen = sizeof(struct sockaddr_in);
 230                 break;
 231 #ifdef HAVE_IPV6
 232         case AF_INET6:
 233                 if (sa_socklen < sizeof(struct sockaddr_in6)) {
 234                         errno = EINVAL;
 235                         return -1;
 236                 }
 237                 sa_socklen = sizeof(struct sockaddr_in6);
 238                 break;
 239 #endif
 240         default:
 241                 errno = EAFNOSUPPORT;
 242                 return -1;
 243         }
 244
 245         if (sa_socklen > sizeof(struct sockaddr_storage)) {
 246                 errno = EINVAL;
 247                 return -1;
 248         }
 249
 250         addr = tsocket_address_create(mem_ctx,
 251                                       &tsocket_address_bsd_ops,
 252                                       &bsda,
 253                                       struct tsocket_address_bsd,
 254                                       location);
 255         if (!addr) {
 256                 errno = ENOMEM;
 257                 return -1;
 258         }
 259
 260         ZERO_STRUCTP(bsda);
 261
 262         memcpy(&bsda->u.ss, sa, sa_socklen);
 263
 264         *_addr = addr;
 265         return 0;
 266 }
 267
 268 ssize_t tsocket_address_bsd_sockaddr(const struct tsocket_address *addr,
 269                                      struct sockaddr *sa,
 270                                      size_t sa_socklen)
 271 {
 272         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 273                                            struct tsocket_address_bsd);
 274         ssize_t rlen = 0;
 275
 276         if (!bsda) {
 277                 errno = EINVAL;
 278                 return -1;
 279         }
 280
 281         switch (bsda->u.sa.sa_family) {
 282         case AF_UNIX:
 283                 rlen = sizeof(struct sockaddr_un);
 284                 break;
 285         case AF_INET:
 286                 rlen = sizeof(struct sockaddr_in);
 287                 break;
 288 #ifdef HAVE_IPV6
 289         case AF_INET6:
 290                 rlen = sizeof(struct sockaddr_in6);
 291                 break;
 292 #endif
 293         default:
 294                 errno = EAFNOSUPPORT;
 295                 return -1;
 296         }
 297
 298         if (sa_socklen < rlen) {
 299                 errno = EINVAL;
 300                 return -1;
 301         }
 302
 303         if (sa_socklen > sizeof(struct sockaddr_storage)) {
 304                 memset(sa, 0, sa_socklen);
 305                 sa_socklen = sizeof(struct sockaddr_storage);
 306         }
 307
 308         memcpy(sa, &bsda->u.ss, sa_socklen);
 309         return rlen;
 310 }
 311
 312 int _tsocket_address_inet_from_strings(TALLOC_CTX *mem_ctx,
 313                                        const char *fam,
 314                                        const char *addr,
 315                                        uint16_t port,
 316                                        struct tsocket_address **_addr,
 317                                        const char *location)
 318 {
 319         struct addrinfo hints;
 320         struct addrinfo *result = NULL;
 321         char port_str[6];
 322         int ret;
 323
 324         ZERO_STRUCT(hints);
 325         /*
 326          * we use SOCKET_STREAM here to get just one result
 327          * back from getaddrinfo().
 328          */
 329         hints.ai_socktype = SOCK_STREAM;
 330         hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
 331
 332         if (strcasecmp(fam, "ip") == 0) {
 333                 hints.ai_family = AF_UNSPEC;
 334                 if (!addr) {
 335 #ifdef HAVE_IPV6
 336                         addr = "::";
 337 #else
 338                         addr = "0.0.0.0";
 339 #endif
 340                 }
 341         } else if (strcasecmp(fam, "ipv4") == 0) {
 342                 hints.ai_family = AF_INET;
 343                 if (!addr) {
 344                         addr = "0.0.0.0";
 345                 }
 346 #ifdef HAVE_IPV6
 347         } else if (strcasecmp(fam, "ipv6") == 0) {
 348                 hints.ai_family = AF_INET6;
 349                 if (!addr) {
 350                         addr = "::";
 351                 }
 352 #endif
 353         } else {
 354                 errno = EAFNOSUPPORT;
 355                 return -1;
 356         }
 357
 358         snprintf(port_str, sizeof(port_str) - 1, "%u", port);
 359
 360         ret = getaddrinfo(addr, port_str, &hints, &result);
 361         if (ret != 0) {
 362                 switch (ret) {
 363                 case EAI_FAIL:
 364                         errno = EINVAL;
 365                         break;
 366                 }
 367                 ret = -1;
 368                 goto done;
 369         }
 370
 371         if (result->ai_socktype != SOCK_STREAM) {
 372                 errno = EINVAL;
 373                 ret = -1;
 374                 goto done;
 375         }
 376
 377         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 378                                                   result->ai_addr,
 379                                                   result->ai_addrlen,
 380                                                   _addr,
 381                                                   location);
 382
 383 done:
 384         if (result) {
 385                 freeaddrinfo(result);
 386         }
 387         return ret;
 388 }
 389
 390 char *tsocket_address_inet_addr_string(const struct tsocket_address *addr,
 391                                        TALLOC_CTX *mem_ctx)
 392 {
 393         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 394                                            struct tsocket_address_bsd);
 395         char addr_str[INET6_ADDRSTRLEN+1];
 396         const char *str;
 397
 398         if (!bsda) {
 399                 errno = EINVAL;
 400                 return NULL;
 401         }
 402
 403         switch (bsda->u.sa.sa_family) {
 404         case AF_INET:
 405                 str = inet_ntop(bsda->u.in.sin_family,
 406                                 &bsda->u.in.sin_addr,
 407                                 addr_str, sizeof(addr_str));
 408                 break;
 409 #ifdef HAVE_IPV6
 410         case AF_INET6:
 411                 str = inet_ntop(bsda->u.in6.sin6_family,
 412                                 &bsda->u.in6.sin6_addr,
 413                                 addr_str, sizeof(addr_str));
 414                 break;
 415 #endif
 416         default:
 417                 errno = EINVAL;
 418                 return NULL;
 419         }
 420
 421         if (!str) {
 422                 return NULL;
 423         }
 424
 425         return talloc_strdup(mem_ctx, str);
 426 }
 427
 428 uint16_t tsocket_address_inet_port(const struct tsocket_address *addr)
 429 {
 430         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 431                                            struct tsocket_address_bsd);
 432         uint16_t port = 0;
 433
 434         if (!bsda) {
 435                 errno = EINVAL;
 436                 return 0;
 437         }
 438
 439         switch (bsda->u.sa.sa_family) {
 440         case AF_INET:
 441                 port = ntohs(bsda->u.in.sin_port);
 442                 break;
 443 #ifdef HAVE_IPV6
 444         case AF_INET6:
 445                 port = ntohs(bsda->u.in6.sin6_port);
 446                 break;
 447 #endif
 448         default:
 449                 errno = EINVAL;
 450                 return 0;
 451         }
 452
 453         return port;
 454 }
 455
 456 int tsocket_address_inet_set_port(struct tsocket_address *addr,
 457                                   uint16_t port)
 458 {
 459         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 460                                            struct tsocket_address_bsd);
 461
 462         if (!bsda) {
 463                 errno = EINVAL;
 464                 return -1;
 465         }
 466
 467         switch (bsda->u.sa.sa_family) {
 468         case AF_INET:
 469                 bsda->u.in.sin_port = htons(port);
 470                 break;
 471 #ifdef HAVE_IPV6
 472         case AF_INET6:
 473                 bsda->u.in6.sin6_port = htons(port);
 474                 break;
 475 #endif
 476         default:
 477                 errno = EINVAL;
 478                 return -1;
 479         }
 480
 481         return 0;
 482 }
 483
 484 int _tsocket_address_unix_from_path(TALLOC_CTX *mem_ctx,
 485                                     const char *path,
 486                                     struct tsocket_address **_addr,
 487                                     const char *location)
 488 {
 489         struct sockaddr_un un;
 490         void *p = &un;
 491         int ret;
 492
 493         if (!path) {
 494                 path = "";
 495         }
 496
 497         if (strlen(path) > sizeof(un.sun_path)-1) {
 498                 errno = ENAMETOOLONG;
 499                 return -1;
 500         }
 501
 502         ZERO_STRUCT(un);
 503         un.sun_family = AF_UNIX;
 504         strncpy(un.sun_path, path, sizeof(un.sun_path)-1);
 505
 506         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 507                                                  (struct sockaddr *)p,
 508                                                  sizeof(un),
 509                                                  _addr,
 510                                                  location);
 511
 512         return ret;
 513 }
 514
 515 char *tsocket_address_unix_path(const struct tsocket_address *addr,
 516                                 TALLOC_CTX *mem_ctx)
 517 {
 518         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 519                                            struct tsocket_address_bsd);
 520         const char *str;
 521
 522         if (!bsda) {
 523                 errno = EINVAL;
 524                 return NULL;
 525         }
 526
 527         switch (bsda->u.sa.sa_family) {
 528         case AF_UNIX:
 529                 str = bsda->u.un.sun_path;
 530                 break;
 531         default:
 532                 errno = EINVAL;
 533                 return NULL;
 534         }
 535
 536         return talloc_strdup(mem_ctx, str);
 537 }
 538
 539 static char *tsocket_address_bsd_string(const struct tsocket_address *addr,
 540                                         TALLOC_CTX *mem_ctx)
 541 {
 542         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 543                                            struct tsocket_address_bsd);
 544         char *str;
 545         char *addr_str;
 546         const char *prefix = NULL;
 547         uint16_t port;
 548
 549         switch (bsda->u.sa.sa_family) {
 550         case AF_UNIX:
 551                 return talloc_asprintf(mem_ctx, "unix:%s",
 552                                        bsda->u.un.sun_path);
 553         case AF_INET:
 554                 prefix = "ipv4";
 555                 break;
 556 #ifdef HAVE_IPV6
 557         case AF_INET6:
 558                 prefix = "ipv6";
 559                 break;
 560 #endif
 561         default:
 562                 errno = EINVAL;
 563                 return NULL;
 564         }
 565
 566         addr_str = tsocket_address_inet_addr_string(addr, mem_ctx);
 567         if (!addr_str) {
 568                 return NULL;
 569         }
 570
 571         port = tsocket_address_inet_port(addr);
 572
 573         str = talloc_asprintf(mem_ctx, "%s:%s:%u",
 574                               prefix, addr_str, port);
 575         talloc_free(addr_str);
 576
 577         return str;
 578 }
 579
 580 static struct tsocket_address *tsocket_address_bsd_copy(const struct tsocket_address *addr,
 581                                                          TALLOC_CTX *mem_ctx,
 582                                                          const char *location)
 583 {
 584         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 585                                            struct tsocket_address_bsd);
 586         struct tsocket_address *copy;
 587         int ret;
 588
 589         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 590                                                  &bsda->u.sa,
 591                                                  sizeof(bsda->u.ss),
 592                                                  &copy,
 593                                                  location);
 594         if (ret != 0) {
 595                 return NULL;
 596         }
 597
 598         return copy;
 599 }
 600
 601 static const struct tsocket_address_ops tsocket_address_bsd_ops = {
 602         .name           = "bsd",
 603         .string         = tsocket_address_bsd_string,
 604         .copy           = tsocket_address_bsd_copy,
 605 };
 606
 607 struct tdgram_bsd {
 608         int fd;
 609
 610         void *event_ptr;
 611         struct tevent_fd *fde;
 612
 613         void *readable_private;
 614         void (*readable_handler)(void *private_data);
 615         void *writeable_private;
 616         void (*writeable_handler)(void *private_data);
 617 };
 618
 619 static void tdgram_bsd_fde_handler(struct tevent_context *ev,
 620                                    struct tevent_fd *fde,
 621                                    uint16_t flags,
 622                                    void *private_data)
 623 {
 624         struct tdgram_bsd *bsds = talloc_get_type_abort(private_data,
 625                                   struct tdgram_bsd);
 626
 627         if (flags & TEVENT_FD_WRITE) {
 628                 bsds->writeable_handler(bsds->writeable_private);
 629                 return;
 630         }
 631         if (flags & TEVENT_FD_READ) {
 632                 if (!bsds->readable_handler) {
 633                         TEVENT_FD_NOT_READABLE(bsds->fde);
 634                         return;
 635                 }
 636                 bsds->readable_handler(bsds->readable_private);
 637                 return;
 638         }
 639 }
 640
 641 static int tdgram_bsd_set_readable_handler(struct tdgram_bsd *bsds,
 642                                            struct tevent_context *ev,
 643                                            void (*handler)(void *private_data),
 644                                            void *private_data)
 645 {
 646         if (ev == NULL) {
 647                 if (handler) {
 648                         errno = EINVAL;
 649                         return -1;
 650                 }
 651                 if (!bsds->readable_handler) {
 652                         return 0;
 653                 }
 654                 bsds->readable_handler = NULL;
 655                 bsds->readable_private = NULL;
 656
 657                 return 0;
 658         }
 659
 660         /* read and write must use the same tevent_context */
 661         if (bsds->event_ptr != ev) {
 662                 if (bsds->readable_handler || bsds->writeable_handler) {
 663                         errno = EINVAL;
 664                         return -1;
 665                 }
 666                 bsds->event_ptr = NULL;
 667                 TALLOC_FREE(bsds->fde);
 668         }
 669
 670         if (tevent_fd_get_flags(bsds->fde) == 0) {
 671                 TALLOC_FREE(bsds->fde);
 672
 673                 bsds->fde = tevent_add_fd(ev, bsds,
 674                                           bsds->fd, TEVENT_FD_READ,
 675                                           tdgram_bsd_fde_handler,
 676                                           bsds);
 677                 if (!bsds->fde) {
 678                         errno = ENOMEM;
 679                         return -1;
 680                 }
 681
 682                 /* cache the event context we're running on */
 683                 bsds->event_ptr = ev;
 684         } else if (!bsds->readable_handler) {
 685                 TEVENT_FD_READABLE(bsds->fde);
 686         }
 687
 688         bsds->readable_handler = handler;
 689         bsds->readable_private = private_data;
 690
 691         return 0;
 692 }
 693
 694 static int tdgram_bsd_set_writeable_handler(struct tdgram_bsd *bsds,
 695                                             struct tevent_context *ev,
 696                                             void (*handler)(void *private_data),
 697                                             void *private_data)
 698 {
 699         if (ev == NULL) {
 700                 if (handler) {
 701                         errno = EINVAL;
 702                         return -1;
 703                 }
 704                 if (!bsds->writeable_handler) {
 705                         return 0;
 706                 }
 707                 bsds->writeable_handler = NULL;
 708                 bsds->writeable_private = NULL;
 709                 TEVENT_FD_NOT_WRITEABLE(bsds->fde);
 710
 711                 return 0;
 712         }
 713
 714         /* read and write must use the same tevent_context */
 715         if (bsds->event_ptr != ev) {
 716                 if (bsds->readable_handler || bsds->writeable_handler) {
 717                         errno = EINVAL;
 718                         return -1;
 719                 }
 720                 bsds->event_ptr = NULL;
 721                 TALLOC_FREE(bsds->fde);
 722         }
 723
 724         if (tevent_fd_get_flags(bsds->fde) == 0) {
 725                 TALLOC_FREE(bsds->fde);
 726
 727                 bsds->fde = tevent_add_fd(ev, bsds,
 728                                           bsds->fd, TEVENT_FD_WRITE,
 729                                           tdgram_bsd_fde_handler,
 730                                           bsds);
 731                 if (!bsds->fde) {
 732                         errno = ENOMEM;
 733                         return -1;
 734                 }
 735
 736                 /* cache the event context we're running on */
 737                 bsds->event_ptr = ev;
 738         } else if (!bsds->writeable_handler) {
 739                 TEVENT_FD_WRITEABLE(bsds->fde);
 740         }
 741
 742         bsds->writeable_handler = handler;
 743         bsds->writeable_private = private_data;
 744
 745         return 0;
 746 }
 747
 748 struct tdgram_bsd_recvfrom_state {
 749         struct tdgram_context *dgram;
 750
 751         uint8_t *buf;
 752         size_t len;
 753         struct tsocket_address *src;
 754 };
 755
 756 static int tdgram_bsd_recvfrom_destructor(struct tdgram_bsd_recvfrom_state *state)
 757 {
 758         struct tdgram_bsd *bsds = tdgram_context_data(state->dgram,
 759                                   struct tdgram_bsd);
 760
 761         tdgram_bsd_set_readable_handler(bsds, NULL, NULL, NULL);
 762
 763         return 0;
 764 }
 765
 766 static void tdgram_bsd_recvfrom_handler(void *private_data);
 767
 768 static struct tevent_req *tdgram_bsd_recvfrom_send(TALLOC_CTX *mem_ctx,
 769                                         struct tevent_context *ev,
 770                                         struct tdgram_context *dgram)
 771 {
 772         struct tevent_req *req;
 773         struct tdgram_bsd_recvfrom_state *state;
 774         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 775         int ret;
 776
 777         req = tevent_req_create(mem_ctx, &state,
 778                                 struct tdgram_bsd_recvfrom_state);
 779         if (!req) {
 780                 return NULL;
 781         }
 782
 783         state->dgram    = dgram;
 784         state->buf      = NULL;
 785         state->len      = 0;
 786         state->src      = NULL;
 787
 788         talloc_set_destructor(state, tdgram_bsd_recvfrom_destructor);
 789
 790         if (bsds->fd == -1) {
 791                 tevent_req_error(req, ENOTCONN);
 792                 goto post;
 793         }
 794
 795         /*
 796          * this is a fast path, not waiting for the
 797          * socket to become explicit readable gains
 798          * about 10%-20% performance in benchmark tests.
 799          */
 800         tdgram_bsd_recvfrom_handler(req);
 801         if (!tevent_req_is_in_progress(req)) {
 802                 goto post;
 803         }
 804
 805         ret = tdgram_bsd_set_readable_handler(bsds, ev,
 806                                               tdgram_bsd_recvfrom_handler,
 807                                               req);
 808         if (ret == -1) {
 809                 tevent_req_error(req, errno);
 810                 goto post;
 811         }
 812
 813         return req;
 814
 815  post:
 816         tevent_req_post(req, ev);
 817         return req;
 818 }
 819
 820 static void tdgram_bsd_recvfrom_handler(void *private_data)
 821 {
 822         struct tevent_req *req = talloc_get_type_abort(private_data,
 823                                  struct tevent_req);
 824         struct tdgram_bsd_recvfrom_state *state = tevent_req_data(req,
 825                                         struct tdgram_bsd_recvfrom_state);
 826         struct tdgram_context *dgram = state->dgram;
 827         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 828         struct tsocket_address_bsd *bsda;
 829         ssize_t ret;
 830         struct sockaddr *sa = NULL;
 831         socklen_t sa_socklen = 0;
 832         int err;
 833         bool retry;
 834
 835         ret = tsocket_bsd_pending(bsds->fd);
 836         if (ret == 0) {
 837                 /* retry later */
 838                 return;
 839         }
 840         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 841         if (retry) {
 842                 /* retry later */
 843                 return;
 844         }
 845         if (tevent_req_error(req, err)) {
 846                 return;
 847         }
 848
 849         state->buf = talloc_array(state, uint8_t, ret);
 850         if (tevent_req_nomem(state->buf, req)) {
 851                 return;
 852         }
 853         state->len = ret;
 854
 855         state->src = tsocket_address_create(state,
 856                                             &tsocket_address_bsd_ops,
 857                                             &bsda,
 858                                             struct tsocket_address_bsd,
 859                                             __location__ "bsd_recvfrom");
 860         if (tevent_req_nomem(state->src, req)) {
 861                 return;
 862         }
 863
 864         ZERO_STRUCTP(bsda);
 865
 866         sa = &bsda->u.sa;
 867         sa_socklen = sizeof(bsda->u.ss);
 868         /*
 869          * for unix sockets we can't use the size of sockaddr_storage
 870          * we would get EINVAL
 871          */
 872         if (bsda->u.sa.sa_family == AF_UNIX) {
 873                 sa_socklen = sizeof(bsda->u.un);
 874         }
 875
 876         ret = recvfrom(bsds->fd, state->buf, state->len, 0, sa, &sa_socklen);
 877         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 878         if (retry) {
 879                 /* retry later */
 880                 return;
 881         }
 882         if (tevent_req_error(req, err)) {
 883                 return;
 884         }
 885
 886         if (ret != state->len) {
 887                 tevent_req_error(req, EIO);
 888                 return;
 889         }
 890
 891         tevent_req_done(req);
 892 }
 893
 894 static ssize_t tdgram_bsd_recvfrom_recv(struct tevent_req *req,
 895                                         int *perrno,
 896                                         TALLOC_CTX *mem_ctx,
 897                                         uint8_t **buf,
 898                                         struct tsocket_address **src)
 899 {
 900         struct tdgram_bsd_recvfrom_state *state = tevent_req_data(req,
 901                                         struct tdgram_bsd_recvfrom_state);
 902         ssize_t ret;
 903
 904         ret = tsocket_simple_int_recv(req, perrno);
 905         if (ret == 0) {
 906                 *buf = talloc_move(mem_ctx, &state->buf);
 907                 ret = state->len;
 908                 if (src) {
 909                         *src = talloc_move(mem_ctx, &state->src);
 910                 }
 911         }
 912
 913         tevent_req_received(req);
 914         return ret;
 915 }
 916
 917 struct tdgram_bsd_sendto_state {
 918         struct tdgram_context *dgram;
 919
 920         const uint8_t *buf;
 921         size_t len;
 922         const struct tsocket_address *dst;
 923
 924         ssize_t ret;
 925 };
 926
 927 static int tdgram_bsd_sendto_destructor(struct tdgram_bsd_sendto_state *state)
 928 {
 929         struct tdgram_bsd *bsds = tdgram_context_data(state->dgram,
 930                                   struct tdgram_bsd);
 931
 932         tdgram_bsd_set_writeable_handler(bsds, NULL, NULL, NULL);
 933
 934         return 0;
 935 }
 936
 937 static void tdgram_bsd_sendto_handler(void *private_data);
 938
 939 static struct tevent_req *tdgram_bsd_sendto_send(TALLOC_CTX *mem_ctx,
 940                                                  struct tevent_context *ev,
 941                                                  struct tdgram_context *dgram,
 942                                                  const uint8_t *buf,
 943                                                  size_t len,
 944                                                  const struct tsocket_address *dst)
 945 {
 946         struct tevent_req *req;
 947         struct tdgram_bsd_sendto_state *state;
 948         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 949         int ret;
 950
 951         req = tevent_req_create(mem_ctx, &state,
 952                                 struct tdgram_bsd_sendto_state);
 953         if (!req) {
 954                 return NULL;
 955         }
 956
 957         state->dgram    = dgram;
 958         state->buf      = buf;
 959         state->len      = len;
 960         state->dst      = dst;
 961         state->ret      = -1;
 962
 963         talloc_set_destructor(state, tdgram_bsd_sendto_destructor);
 964
 965         if (bsds->fd == -1) {
 966                 tevent_req_error(req, ENOTCONN);
 967                 goto post;
 968         }
 969
 970         /*
 971          * this is a fast path, not waiting for the
 972          * socket to become explicit writeable gains
 973          * about 10%-20% performance in benchmark tests.
 974          */
 975         tdgram_bsd_sendto_handler(req);
 976         if (!tevent_req_is_in_progress(req)) {
 977                 goto post;
 978         }
 979
 980         ret = tdgram_bsd_set_writeable_handler(bsds, ev,
 981                                                tdgram_bsd_sendto_handler,
 982                                                req);
 983         if (ret == -1) {
 984                 tevent_req_error(req, errno);
 985                 goto post;
 986         }
 987
 988         return req;
 989
 990  post:
 991         tevent_req_post(req, ev);
 992         return req;
 993 }
 994
 995 static void tdgram_bsd_sendto_handler(void *private_data)
 996 {
 997         struct tevent_req *req = talloc_get_type_abort(private_data,
 998                                  struct tevent_req);
 999         struct tdgram_bsd_sendto_state *state = tevent_req_data(req,
1000                                         struct tdgram_bsd_sendto_state);
1001         struct tdgram_context *dgram = state->dgram;
1002         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
1003         struct sockaddr *sa = NULL;
1004         socklen_t sa_socklen = 0;
1005         ssize_t ret;
1006         int err;
1007         bool retry;
1008
1009         if (state->dst) {
1010                 struct tsocket_address_bsd *bsda =
1011                         talloc_get_type(state->dst->private_data,
1012                         struct tsocket_address_bsd);
1013
1014                 sa = &bsda->u.sa;
1015                 sa_socklen = sizeof(bsda->u.ss);
1016                 /*
1017                  * for unix sockets we can't use the size of sockaddr_storage
1018                  * we would get EINVAL
1019                  */
1020                 if (bsda->u.sa.sa_family == AF_UNIX) {
1021                         sa_socklen = sizeof(bsda->u.un);
1022                 }
1023         }
1024
1025         ret = sendto(bsds->fd, state->buf, state->len, 0, sa, sa_socklen);
1026         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
1027         if (retry) {
1028                 /* retry later */
1029                 return;
1030         }
1031         if (tevent_req_error(req, err)) {
1032                 return;
1033         }
1034
1035         state->ret = ret;
1036
1037         tevent_req_done(req);
1038 }
1039
1040 static ssize_t tdgram_bsd_sendto_recv(struct tevent_req *req, int *perrno)
1041 {
1042         struct tdgram_bsd_sendto_state *state = tevent_req_data(req,
1043                                         struct tdgram_bsd_sendto_state);
1044         ssize_t ret;
1045
1046         ret = tsocket_simple_int_recv(req, perrno);
1047         if (ret == 0) {
1048                 ret = state->ret;
1049         }
1050
1051         tevent_req_received(req);
1052         return ret;
1053 }
1054
1055 struct tdgram_bsd_disconnect_state {
1056         uint8_t __dummy;
1057 };
1058
1059 static struct tevent_req *tdgram_bsd_disconnect_send(TALLOC_CTX *mem_ctx,
1060                                                      struct tevent_context *ev,
1061                                                      struct tdgram_context *dgram)
1062 {
1063         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
1064         struct tevent_req *req;
1065         struct tdgram_bsd_disconnect_state *state;
1066         int ret;
1067         int err;
1068         bool dummy;
1069
1070         req = tevent_req_create(mem_ctx, &state,
1071                                 struct tdgram_bsd_disconnect_state);
1072         if (req == NULL) {
1073                 return NULL;
1074         }
1075
1076         if (bsds->fd == -1) {
1077                 tevent_req_error(req, ENOTCONN);
1078                 goto post;
1079         }
1080
1081         ret = close(bsds->fd);
1082         bsds->fd = -1;
1083         err = tsocket_bsd_error_from_errno(ret, errno, &dummy);
1084         if (tevent_req_error(req, err)) {
1085                 goto post;
1086         }
1087
1088         tevent_req_done(req);
1089 post:
1090         tevent_req_post(req, ev);
1091         return req;
1092 }
1093
1094 static int tdgram_bsd_disconnect_recv(struct tevent_req *req,
1095                                       int *perrno)
1096 {
1097         int ret;
1098
1099         ret = tsocket_simple_int_recv(req, perrno);
1100
1101         tevent_req_received(req);
1102         return ret;
1103 }
1104
1105 static const struct tdgram_context_ops tdgram_bsd_ops = {
1106         .name                   = "bsd",
1107
1108         .recvfrom_send          = tdgram_bsd_recvfrom_send,
1109         .recvfrom_recv          = tdgram_bsd_recvfrom_recv,
1110
1111         .sendto_send            = tdgram_bsd_sendto_send,
1112         .sendto_recv            = tdgram_bsd_sendto_recv,
1113
1114         .disconnect_send        = tdgram_bsd_disconnect_send,
1115         .disconnect_recv        = tdgram_bsd_disconnect_recv,
1116 };
1117
1118 static int tdgram_bsd_destructor(struct tdgram_bsd *bsds)
1119 {
1120         TALLOC_FREE(bsds->fde);
1121         if (bsds->fd != -1) {
1122                 close(bsds->fd);
1123                 bsds->fd = -1;
1124         }
1125         return 0;
1126 }
1127
1128 static int tdgram_bsd_dgram_socket(const struct tsocket_address *local,
1129                                    const struct tsocket_address *remote,
1130                                    bool broadcast,
1131                                    TALLOC_CTX *mem_ctx,
1132                                    struct tdgram_context **_dgram,
1133                                    const char *location)
1134 {
1135         struct tsocket_address_bsd *lbsda =
1136                 talloc_get_type_abort(local->private_data,
1137                 struct tsocket_address_bsd);
1138         struct tsocket_address_bsd *rbsda = NULL;
1139         struct tdgram_context *dgram;
1140         struct tdgram_bsd *bsds;
1141         int fd;
1142         int ret;
1143         bool do_bind = false;
1144         bool do_reuseaddr = false;
1145         bool is_inet = false;
1146         int sa_fam = lbsda->u.sa.sa_family;
1147         socklen_t sa_socklen = sizeof(lbsda->u.ss);
1148
1149         if (remote) {
1150                 rbsda = talloc_get_type_abort(remote->private_data,
1151                         struct tsocket_address_bsd);
1152         }
1153
1154         switch (lbsda->u.sa.sa_family) {
1155         case AF_UNIX:
1156                 if (broadcast) {
1157                         errno = EINVAL;
1158                         return -1;
1159                 }
1160                 if (lbsda->u.un.sun_path[0] != 0) {
1161                         do_reuseaddr = true;
1162                         do_bind = true;
1163                 }
1164                 /*
1165                  * for unix sockets we can't use the size of sockaddr_storage
1166                  * we would get EINVAL
1167                  */
1168                 sa_socklen = sizeof(lbsda->u.un);
1169                 break;
1170         case AF_INET:
1171                 if (lbsda->u.in.sin_port != 0) {
1172                         do_reuseaddr = true;
1173                         do_bind = true;
1174                 }
1175                 if (lbsda->u.in.sin_addr.s_addr != INADDR_ANY) {
1176                         do_bind = true;
1177                 }
1178                 is_inet = true;
1179                 sa_socklen = sizeof(rbsda->u.in);
1180                 break;
1181 #ifdef HAVE_IPV6
1182         case AF_INET6:
1183                 if (lbsda->u.in6.sin6_port != 0) {
1184                         do_reuseaddr = true;
1185                         do_bind = true;
1186                 }
1187                 if (memcmp(&in6addr_any,
1188                            &lbsda->u.in6.sin6_addr,
1189                            sizeof(in6addr_any)) != 0) {
1190                         do_bind = true;
1191                 }
1192                 is_inet = true;
1193                 sa_socklen = sizeof(rbsda->u.in6);
1194                 break;
1195 #endif
1196         default:
1197                 errno = EINVAL;
1198                 return -1;
1199         }
1200
1201         if (!do_bind && is_inet && rbsda) {
1202                 sa_fam = rbsda->u.sa.sa_family;
1203                 switch (sa_fam) {
1204                 case AF_INET:
1205                         sa_socklen = sizeof(rbsda->u.in);
1206                         break;
1207 #ifdef HAVE_IPV6
1208                 case AF_INET6:
1209                         sa_socklen = sizeof(rbsda->u.in6);
1210                         break;
1211 #endif
1212                 }
1213         }
1214
1215         fd = socket(sa_fam, SOCK_DGRAM, 0);
1216         if (fd < 0) {
1217                 return fd;
1218         }
1219
1220         fd = tsocket_bsd_common_prepare_fd(fd, true);
1221         if (fd < 0) {
1222                 return fd;
1223         }
1224
1225         dgram = tdgram_context_create(mem_ctx,
1226                                       &tdgram_bsd_ops,
1227                                       &bsds,
1228                                       struct tdgram_bsd,
1229                                       location);
1230         if (!dgram) {
1231                 int saved_errno = errno;
1232                 close(fd);
1233                 errno = saved_errno;
1234                 return -1;
1235         }
1236         ZERO_STRUCTP(bsds);
1237         bsds->fd = fd;
1238         talloc_set_destructor(bsds, tdgram_bsd_destructor);
1239
1240         if (broadcast) {
1241                 int val = 1;
1242
1243                 ret = setsockopt(fd, SOL_SOCKET, SO_BROADCAST,
1244                                  (const void *)&val, sizeof(val));
1245                 if (ret == -1) {
1246                         int saved_errno = errno;
1247                         talloc_free(dgram);
1248                         errno = saved_errno;
1249                         return ret;
1250                 }
1251         }
1252
1253         if (do_reuseaddr) {
1254                 int val = 1;
1255
1256                 ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
1257                                  (const void *)&val, sizeof(val));
1258                 if (ret == -1) {
1259                         int saved_errno = errno;
1260                         talloc_free(dgram);
1261                         errno = saved_errno;
1262                         return ret;
1263                 }
1264         }
1265
1266         if (do_bind) {
1267                 ret = bind(fd, &lbsda->u.sa, sa_socklen);
1268                 if (ret == -1) {
1269                         int saved_errno = errno;
1270                         talloc_free(dgram);
1271                         errno = saved_errno;
1272                         return ret;
1273                 }
1274         }
1275
1276         if (rbsda) {
1277                 if (rbsda->u.sa.sa_family != sa_fam) {
1278                         talloc_free(dgram);
1279                         errno = EINVAL;
1280                         return -1;
1281                 }
1282
1283                 ret = connect(fd, &rbsda->u.sa, sa_socklen);
1284                 if (ret == -1) {
1285                         int saved_errno = errno;
1286                         talloc_free(dgram);
1287                         errno = saved_errno;
1288                         return ret;
1289                 }
1290         }
1291
1292         *_dgram = dgram;
1293         return 0;
1294 }
1295
1296 int _tdgram_inet_udp_socket(const struct tsocket_address *local,
1297                             const struct tsocket_address *remote,
1298                             TALLOC_CTX *mem_ctx,
1299                             struct tdgram_context **dgram,
1300                             const char *location)
1301 {
1302         struct tsocket_address_bsd *lbsda =
1303                 talloc_get_type_abort(local->private_data,
1304                 struct tsocket_address_bsd);
1305         int ret;
1306
1307         switch (lbsda->u.sa.sa_family) {
1308         case AF_INET:
1309                 break;
1310 #ifdef HAVE_IPV6
1311         case AF_INET6:
1312                 break;
1313 #endif
1314         default:
1315                 errno = EINVAL;
1316                 return -1;
1317         }
1318
1319         ret = tdgram_bsd_dgram_socket(local, remote, false,
1320                                       mem_ctx, dgram, location);
1321
1322         return ret;
1323 }
1324
1325 int _tdgram_unix_socket(const struct tsocket_address *local,
1326                         const struct tsocket_address *remote,
1327                         TALLOC_CTX *mem_ctx,
1328                         struct tdgram_context **dgram,
1329                         const char *location)
1330 {
1331         struct tsocket_address_bsd *lbsda =
1332                 talloc_get_type_abort(local->private_data,
1333                 struct tsocket_address_bsd);
1334         int ret;
1335
1336         switch (lbsda->u.sa.sa_family) {
1337         case AF_UNIX:
1338                 break;
1339         default:
1340                 errno = EINVAL;
1341                 return -1;
1342         }
1343
1344         ret = tdgram_bsd_dgram_socket(local, remote, false,
1345                                       mem_ctx, dgram, location);
1346
1347         return ret;
1348 }
1349
1350 struct tstream_bsd {
1351         int fd;
1352
1353         void *event_ptr;
1354         struct tevent_fd *fde;
1355
1356         void *readable_private;
1357         void (*readable_handler)(void *private_data);
1358         void *writeable_private;
1359         void (*writeable_handler)(void *private_data);
1360 };
1361
1362 static void tstream_bsd_fde_handler(struct tevent_context *ev,
1363                                     struct tevent_fd *fde,
1364                                     uint16_t flags,
1365                                     void *private_data)
1366 {
1367         struct tstream_bsd *bsds = talloc_get_type_abort(private_data,
1368                                    struct tstream_bsd);
1369
1370         if (flags & TEVENT_FD_WRITE) {
1371                 bsds->writeable_handler(bsds->writeable_private);
1372                 return;
1373         }
1374         if (flags & TEVENT_FD_READ) {
1375                 if (!bsds->readable_handler) {
1376                         if (bsds->writeable_handler) {
1377                                 bsds->writeable_handler(bsds->writeable_private);
1378                                 return;
1379                         }
1380                         TEVENT_FD_NOT_READABLE(bsds->fde);
1381                         return;
1382                 }
1383                 bsds->readable_handler(bsds->readable_private);
1384                 return;
1385         }
1386 }
1387
1388 static int tstream_bsd_set_readable_handler(struct tstream_bsd *bsds,
1389                                             struct tevent_context *ev,
1390                                             void (*handler)(void *private_data),
1391                                             void *private_data)
1392 {
1393         if (ev == NULL) {
1394                 if (handler) {
1395                         errno = EINVAL;
1396                         return -1;
1397                 }
1398                 if (!bsds->readable_handler) {
1399                         return 0;
1400                 }
1401                 bsds->readable_handler = NULL;
1402                 bsds->readable_private = NULL;
1403
1404                 return 0;
1405         }
1406
1407         /* read and write must use the same tevent_context */
1408         if (bsds->event_ptr != ev) {
1409                 if (bsds->readable_handler || bsds->writeable_handler) {
1410                         errno = EINVAL;
1411                         return -1;
1412                 }
1413                 bsds->event_ptr = NULL;
1414                 TALLOC_FREE(bsds->fde);
1415         }
1416
1417         if (tevent_fd_get_flags(bsds->fde) == 0) {
1418                 TALLOC_FREE(bsds->fde);
1419
1420                 bsds->fde = tevent_add_fd(ev, bsds,
1421                                           bsds->fd, TEVENT_FD_READ,
1422                                           tstream_bsd_fde_handler,
1423                                           bsds);
1424                 if (!bsds->fde) {
1425                         errno = ENOMEM;
1426                         return -1;
1427                 }
1428
1429                 /* cache the event context we're running on */
1430                 bsds->event_ptr = ev;
1431         } else if (!bsds->readable_handler) {
1432                 TEVENT_FD_READABLE(bsds->fde);
1433         }
1434
1435         bsds->readable_handler = handler;
1436         bsds->readable_private = private_data;
1437
1438         return 0;
1439 }
1440
1441 static int tstream_bsd_set_writeable_handler(struct tstream_bsd *bsds,
1442                                              struct tevent_context *ev,
1443                                              void (*handler)(void *private_data),
1444                                              void *private_data)
1445 {
1446         if (ev == NULL) {
1447                 if (handler) {
1448                         errno = EINVAL;
1449                         return -1;
1450                 }
1451                 if (!bsds->writeable_handler) {
1452                         return 0;
1453                 }
1454                 bsds->writeable_handler = NULL;
1455                 bsds->writeable_private = NULL;
1456                 TEVENT_FD_NOT_WRITEABLE(bsds->fde);
1457
1458                 return 0;
1459         }
1460
1461         /* read and write must use the same tevent_context */
1462         if (bsds->event_ptr != ev) {
1463                 if (bsds->readable_handler || bsds->writeable_handler) {
1464                         errno = EINVAL;
1465                         return -1;
1466                 }
1467                 bsds->event_ptr = NULL;
1468                 TALLOC_FREE(bsds->fde);
1469         }
1470
1471         if (tevent_fd_get_flags(bsds->fde) == 0) {
1472                 TALLOC_FREE(bsds->fde);
1473
1474                 bsds->fde = tevent_add_fd(ev, bsds,
1475                                           bsds->fd,
1476                                           TEVENT_FD_READ | TEVENT_FD_WRITE,
1477                                           tstream_bsd_fde_handler,
1478                                           bsds);
1479                 if (!bsds->fde) {
1480                         errno = ENOMEM;
1481                         return -1;
1482                 }
1483
1484                 /* cache the event context we're running on */
1485                 bsds->event_ptr = ev;
1486         } else if (!bsds->writeable_handler) {
1487                 uint16_t flags = tevent_fd_get_flags(bsds->fde);
1488                 flags |= TEVENT_FD_READ | TEVENT_FD_WRITE;
1489                 tevent_fd_set_flags(bsds->fde, flags);
1490         }
1491
1492         bsds->writeable_handler = handler;
1493         bsds->writeable_private = private_data;
1494
1495         return 0;
1496 }
1497
1498 static ssize_t tstream_bsd_pending_bytes(struct tstream_context *stream)
1499 {
1500         struct tstream_bsd *bsds = tstream_context_data(stream,
1501                                    struct tstream_bsd);
1502         ssize_t ret;
1503
1504         if (bsds->fd == -1) {
1505                 errno = ENOTCONN;
1506                 return -1;
1507         }
1508
1509         ret = tsocket_bsd_pending(bsds->fd);
1510
1511         return ret;
1512 }
1513
1514 struct tstream_bsd_readv_state {
1515         struct tstream_context *stream;
1516
1517         struct iovec *vector;
1518         size_t count;
1519
1520         int ret;
1521 };
1522
1523 static int tstream_bsd_readv_destructor(struct tstream_bsd_readv_state *state)
1524 {
1525         struct tstream_bsd *bsds = tstream_context_data(state->stream,
1526                                    struct tstream_bsd);
1527
1528         tstream_bsd_set_readable_handler(bsds, NULL, NULL, NULL);
1529
1530         return 0;
1531 }
1532
1533 static void tstream_bsd_readv_handler(void *private_data);
1534
1535 static struct tevent_req *tstream_bsd_readv_send(TALLOC_CTX *mem_ctx,
1536                                         struct tevent_context *ev,
1537                                         struct tstream_context *stream,
1538                                         struct iovec *vector,
1539                                         size_t count)
1540 {
1541         struct tevent_req *req;
1542         struct tstream_bsd_readv_state *state;
1543         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1544         int ret;
1545
1546         req = tevent_req_create(mem_ctx, &state,
1547                                 struct tstream_bsd_readv_state);
1548         if (!req) {
1549                 return NULL;
1550         }
1551
1552         state->stream   = stream;
1553         /* we make a copy of the vector so that we can modify it */
1554         state->vector   = talloc_array(state, struct iovec, count);
1555         if (tevent_req_nomem(state->vector, req)) {
1556                 goto post;
1557         }
1558         memcpy(state->vector, vector, sizeof(struct iovec)*count);
1559         state->count    = count;
1560         state->ret      = 0;
1561
1562         talloc_set_destructor(state, tstream_bsd_readv_destructor);
1563
1564         if (bsds->fd == -1) {
1565                 tevent_req_error(req, ENOTCONN);
1566                 goto post;
1567         }
1568
1569         /*
1570          * this is a fast path, not waiting for the
1571          * socket to become explicit readable gains
1572          * about 10%-20% performance in benchmark tests.
1573          */
1574         tstream_bsd_readv_handler(req);
1575         if (!tevent_req_is_in_progress(req)) {
1576                 goto post;
1577         }
1578
1579         ret = tstream_bsd_set_readable_handler(bsds, ev,
1580                                               tstream_bsd_readv_handler,
1581                                               req);
1582         if (ret == -1) {
1583                 tevent_req_error(req, errno);
1584                 goto post;
1585         }
1586
1587         return req;
1588
1589  post:
1590         tevent_req_post(req, ev);
1591         return req;
1592 }
1593
1594 static void tstream_bsd_readv_handler(void *private_data)
1595 {
1596         struct tevent_req *req = talloc_get_type_abort(private_data,
1597                                  struct tevent_req);
1598         struct tstream_bsd_readv_state *state = tevent_req_data(req,
1599                                         struct tstream_bsd_readv_state);
1600         struct tstream_context *stream = state->stream;
1601         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1602         int ret;
1603         int err;
1604         bool retry;
1605
1606         ret = readv(bsds->fd, state->vector, state->count);
1607         if (ret == 0) {
1608                 /* propagate end of file */
1609                 tevent_req_error(req, EPIPE);
1610                 return;
1611         }
1612         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
1613         if (retry) {
1614                 /* retry later */
1615                 return;
1616         }
1617         if (tevent_req_error(req, err)) {
1618                 return;
1619         }
1620
1621         state->ret += ret;
1622
1623         while (ret > 0) {
1624                 if (ret < state->vector[0].iov_len) {
1625                         uint8_t *base;
1626                         base = (uint8_t *)state->vector[0].iov_base;
1627                         base += ret;
1628                         state->vector[0].iov_base = base;
1629                         state->vector[0].iov_len -= ret;
1630                         break;
1631                 }
1632                 ret -= state->vector[0].iov_len;
1633                 state->vector += 1;
1634                 state->count -= 1;
1635         }
1636
1637         /*
1638          * there're maybe some empty vectors at the end
1639          * which we need to skip, otherwise we would get
1640          * ret == 0 from the readv() call and return EPIPE
1641          */
1642         while (state->count > 0) {
1643                 if (state->vector[0].iov_len > 0) {
1644                         break;
1645                 }
1646                 state->vector += 1;
1647                 state->count -= 1;
1648         }
1649
1650         if (state->count > 0) {
1651                 /* we have more to read */
1652                 return;
1653         }
1654
1655         tevent_req_done(req);
1656 }
1657
1658 static int tstream_bsd_readv_recv(struct tevent_req *req,
1659                                   int *perrno)
1660 {
1661         struct tstream_bsd_readv_state *state = tevent_req_data(req,
1662                                         struct tstream_bsd_readv_state);
1663         int ret;
1664
1665         ret = tsocket_simple_int_recv(req, perrno);
1666         if (ret == 0) {
1667                 ret = state->ret;
1668         }
1669
1670         tevent_req_received(req);
1671         return ret;
1672 }
1673
1674 struct tstream_bsd_writev_state {
1675         struct tstream_context *stream;
1676
1677         struct iovec *vector;
1678         size_t count;
1679
1680         int ret;
1681 };
1682
1683 static int tstream_bsd_writev_destructor(struct tstream_bsd_writev_state *state)
1684 {
1685         struct tstream_bsd *bsds = tstream_context_data(state->stream,
1686                                   struct tstream_bsd);
1687
1688         tstream_bsd_set_writeable_handler(bsds, NULL, NULL, NULL);
1689
1690         return 0;
1691 }
1692
1693 static void tstream_bsd_writev_handler(void *private_data);
1694
1695 static struct tevent_req *tstream_bsd_writev_send(TALLOC_CTX *mem_ctx,
1696                                                  struct tevent_context *ev,
1697                                                  struct tstream_context *stream,
1698                                                  const struct iovec *vector,
1699                                                  size_t count)
1700 {
1701         struct tevent_req *req;
1702         struct tstream_bsd_writev_state *state;
1703         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1704         int ret;
1705
1706         req = tevent_req_create(mem_ctx, &state,
1707                                 struct tstream_bsd_writev_state);
1708         if (!req) {
1709                 return NULL;
1710         }
1711
1712         state->stream   = stream;
1713         /* we make a copy of the vector so that we can modify it */
1714         state->vector   = talloc_array(state, struct iovec, count);
1715         if (tevent_req_nomem(state->vector, req)) {
1716                 goto post;
1717         }
1718         memcpy(state->vector, vector, sizeof(struct iovec)*count);
1719         state->count    = count;
1720         state->ret      = 0;
1721
1722         talloc_set_destructor(state, tstream_bsd_writev_destructor);
1723
1724         if (bsds->fd == -1) {
1725                 tevent_req_error(req, ENOTCONN);
1726                 goto post;
1727         }
1728
1729         /*
1730          * this is a fast path, not waiting for the
1731          * socket to become explicit writeable gains
1732          * about 10%-20% performance in benchmark tests.
1733          */
1734         tstream_bsd_writev_handler(req);
1735         if (!tevent_req_is_in_progress(req)) {
1736                 goto post;
1737         }
1738
1739         ret = tstream_bsd_set_writeable_handler(bsds, ev,
1740                                                tstream_bsd_writev_handler,
1741                                                req);
1742         if (ret == -1) {
1743                 tevent_req_error(req, errno);
1744                 goto post;
1745         }
1746
1747         return req;
1748
1749  post:
1750         tevent_req_post(req, ev);
1751         return req;
1752 }
1753
1754 static void tstream_bsd_writev_handler(void *private_data)
1755 {
1756         struct tevent_req *req = talloc_get_type_abort(private_data,
1757                                  struct tevent_req);
1758         struct tstream_bsd_writev_state *state = tevent_req_data(req,
1759                                         struct tstream_bsd_writev_state);
1760         struct tstream_context *stream = state->stream;
1761         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1762         ssize_t ret;
1763         int err;
1764         bool retry;
1765
1766         ret = writev(bsds->fd, state->vector, state->count);
1767         if (ret == 0) {
1768                 /* propagate end of file */
1769                 tevent_req_error(req, EPIPE);
1770                 return;
1771         }
1772         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
1773         if (retry) {
1774                 /* retry later */
1775                 return;
1776         }
1777         if (tevent_req_error(req, err)) {
1778                 return;
1779         }
1780
1781         state->ret += ret;
1782
1783         while (ret > 0) {
1784                 if (ret < state->vector[0].iov_len) {
1785                         uint8_t *base;
1786                         base = (uint8_t *)state->vector[0].iov_base;
1787                         base += ret;
1788                         state->vector[0].iov_base = base;
1789                         state->vector[0].iov_len -= ret;
1790                         break;
1791                 }
1792                 ret -= state->vector[0].iov_len;
1793                 state->vector += 1;
1794                 state->count -= 1;
1795         }
1796
1797         /*
1798          * there're maybe some empty vectors at the end
1799          * which we need to skip, otherwise we would get
1800          * ret == 0 from the writev() call and return EPIPE
1801          */
1802         while (state->count > 0) {
1803                 if (state->vector[0].iov_len > 0) {
1804                         break;
1805                 }
1806                 state->vector += 1;
1807                 state->count -= 1;
1808         }
1809
1810         if (state->count > 0) {
1811                 /* we have more to read */
1812                 return;
1813         }
1814
1815         tevent_req_done(req);
1816 }
1817
1818 static int tstream_bsd_writev_recv(struct tevent_req *req, int *perrno)
1819 {
1820         struct tstream_bsd_writev_state *state = tevent_req_data(req,
1821                                         struct tstream_bsd_writev_state);
1822         int ret;
1823
1824         ret = tsocket_simple_int_recv(req, perrno);
1825         if (ret == 0) {
1826                 ret = state->ret;
1827         }
1828
1829         tevent_req_received(req);
1830         return ret;
1831 }
1832
1833 struct tstream_bsd_disconnect_state {
1834         void *__dummy;
1835 };
1836
1837 static struct tevent_req *tstream_bsd_disconnect_send(TALLOC_CTX *mem_ctx,
1838                                                      struct tevent_context *ev,
1839                                                      struct tstream_context *stream)
1840 {
1841         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1842         struct tevent_req *req;
1843         struct tstream_bsd_disconnect_state *state;
1844         int ret;
1845         int err;
1846         bool dummy;
1847
1848         req = tevent_req_create(mem_ctx, &state,
1849                                 struct tstream_bsd_disconnect_state);
1850         if (req == NULL) {
1851                 return NULL;
1852         }
1853
1854         if (bsds->fd == -1) {
1855                 tevent_req_error(req, ENOTCONN);
1856                 goto post;
1857         }
1858
1859         ret = close(bsds->fd);
1860         bsds->fd = -1;
1861         err = tsocket_bsd_error_from_errno(ret, errno, &dummy);
1862         if (tevent_req_error(req, err)) {
1863                 goto post;
1864         }
1865
1866         tevent_req_done(req);
1867 post:
1868         tevent_req_post(req, ev);
1869         return req;
1870 }
1871
1872 static int tstream_bsd_disconnect_recv(struct tevent_req *req,
1873                                       int *perrno)
1874 {
1875         int ret;
1876
1877         ret = tsocket_simple_int_recv(req, perrno);
1878
1879         tevent_req_received(req);
1880         return ret;
1881 }
1882
1883 static const struct tstream_context_ops tstream_bsd_ops = {
1884         .name                   = "bsd",
1885
1886         .pending_bytes          = tstream_bsd_pending_bytes,
1887
1888         .readv_send             = tstream_bsd_readv_send,
1889         .readv_recv             = tstream_bsd_readv_recv,
1890
1891         .writev_send            = tstream_bsd_writev_send,
1892         .writev_recv            = tstream_bsd_writev_recv,
1893
1894         .disconnect_send        = tstream_bsd_disconnect_send,
1895         .disconnect_recv        = tstream_bsd_disconnect_recv,
1896 };
1897
1898 static int tstream_bsd_destructor(struct tstream_bsd *bsds)
1899 {
1900         TALLOC_FREE(bsds->fde);
1901         if (bsds->fd != -1) {
1902                 close(bsds->fd);
1903                 bsds->fd = -1;
1904         }
1905         return 0;
1906 }
1907
1908 int _tstream_bsd_existing_socket(TALLOC_CTX *mem_ctx,
1909                                  int fd,
1910                                  struct tstream_context **_stream,
1911                                  const char *location)
1912 {
1913         struct tstream_context *stream;
1914         struct tstream_bsd *bsds;
1915
1916         stream = tstream_context_create(mem_ctx,
1917                                         &tstream_bsd_ops,
1918                                         &bsds,
1919                                         struct tstream_bsd,
1920                                         location);
1921         if (!stream) {
1922                 return -1;
1923         }
1924         ZERO_STRUCTP(bsds);
1925         bsds->fd = fd;
1926         talloc_set_destructor(bsds, tstream_bsd_destructor);
1927
1928         *_stream = stream;
1929         return 0;
1930 }
1931
1932 struct tstream_bsd_connect_state {
1933         int fd;
1934         struct tevent_fd *fde;
1935         struct tstream_conext *stream;
1936 };
1937
1938 static int tstream_bsd_connect_destructor(struct tstream_bsd_connect_state *state)
1939 {
1940         TALLOC_FREE(state->fde);
1941         if (state->fd != -1) {
1942                 close(state->fd);
1943                 state->fd = -1;
1944         }
1945
1946         return 0;
1947 }
1948
1949 static void tstream_bsd_connect_fde_handler(struct tevent_context *ev,
1950                                             struct tevent_fd *fde,
1951                                             uint16_t flags,
1952                                             void *private_data);
1953
1954 static struct tevent_req * tstream_bsd_connect_send(TALLOC_CTX *mem_ctx,
1955                                         struct tevent_context *ev,
1956                                         int sys_errno,
1957                                         const struct tsocket_address *local,
1958                                         const struct tsocket_address *remote)
1959 {
1960         struct tevent_req *req;
1961         struct tstream_bsd_connect_state *state;
1962         struct tsocket_address_bsd *lbsda =
1963                 talloc_get_type_abort(local->private_data,
1964                 struct tsocket_address_bsd);
1965         struct tsocket_address_bsd *rbsda =
1966                 talloc_get_type_abort(remote->private_data,
1967                 struct tsocket_address_bsd);
1968         int ret;
1969         int err;
1970         bool retry;
1971         bool do_bind = false;
1972         bool do_reuseaddr = false;
1973         bool is_inet = false;
1974         int sa_fam = lbsda->u.sa.sa_family;
1975         socklen_t sa_socklen = sizeof(rbsda->u.ss);
1976
1977         req = tevent_req_create(mem_ctx, &state,
1978                                 struct tstream_bsd_connect_state);
1979         if (!req) {
1980                 return NULL;
1981         }
1982         state->fd = -1;
1983         state->fde = NULL;
1984
1985         talloc_set_destructor(state, tstream_bsd_connect_destructor);
1986
1987         /* give the wrappers a chance to report an error */
1988         if (sys_errno != 0) {
1989                 tevent_req_error(req, sys_errno);
1990                 goto post;
1991         }
1992
1993         switch (lbsda->u.sa.sa_family) {
1994         case AF_UNIX:
1995                 if (lbsda->u.un.sun_path[0] != 0) {
1996                         do_reuseaddr = true;
1997                         do_bind = true;
1998                 }
1999                 /*
2000                  * for unix sockets we can't use the size of sockaddr_storage
2001                  * we would get EINVAL
2002                  */
2003                 sa_socklen = sizeof(rbsda->u.un);
2004                 break;
2005         case AF_INET:
2006                 if (lbsda->u.in.sin_port != 0) {
2007                         do_reuseaddr = true;
2008                         do_bind = true;
2009                 }
2010                 if (lbsda->u.in.sin_addr.s_addr != INADDR_ANY) {
2011                         do_bind = true;
2012                 }
2013                 is_inet = true;
2014                 sa_socklen = sizeof(rbsda->u.in);
2015                 break;
2016 #ifdef HAVE_IPV6
2017         case AF_INET6:
2018                 if (lbsda->u.in6.sin6_port != 0) {
2019                         do_reuseaddr = true;
2020                         do_bind = true;
2021                 }
2022                 if (memcmp(&in6addr_any,
2023                            &lbsda->u.in6.sin6_addr,
2024                            sizeof(in6addr_any)) != 0) {
2025                         do_bind = true;
2026                 }
2027                 is_inet = true;
2028                 sa_socklen = sizeof(rbsda->u.in6);
2029                 break;
2030 #endif
2031         default:
2032                 tevent_req_error(req, EINVAL);
2033                 goto post;
2034         }
2035
2036         if (!do_bind && is_inet) {
2037                 sa_fam = rbsda->u.sa.sa_family;
2038                 switch (sa_fam) {
2039                 case AF_INET:
2040                         sa_socklen = sizeof(rbsda->u.in);
2041                         break;
2042 #ifdef HAVE_IPV6
2043                 case AF_INET6:
2044                         sa_socklen = sizeof(rbsda->u.in6);
2045                         break;
2046 #endif
2047                 }
2048         }
2049
2050         state->fd = socket(sa_fam, SOCK_STREAM, 0);
2051         if (state->fd == -1) {
2052                 tevent_req_error(req, errno);
2053                 goto post;
2054         }
2055
2056         state->fd = tsocket_bsd_common_prepare_fd(state->fd, true);
2057         if (state->fd == -1) {
2058                 tevent_req_error(req, errno);
2059                 goto post;
2060         }
2061
2062         if (do_reuseaddr) {
2063                 int val = 1;
2064
2065                 ret = setsockopt(state->fd, SOL_SOCKET, SO_REUSEADDR,
2066                                  (const void *)&val, sizeof(val));
2067                 if (ret == -1) {
2068                         tevent_req_error(req, errno);
2069                         goto post;
2070                 }
2071         }
2072
2073         if (do_bind) {
2074                 ret = bind(state->fd, &lbsda->u.sa, sa_socklen);
2075                 if (ret == -1) {
2076                         tevent_req_error(req, errno);
2077                         goto post;
2078                 }
2079         }
2080
2081         if (rbsda->u.sa.sa_family != sa_fam) {
2082                 tevent_req_error(req, EINVAL);
2083                 goto post;
2084         }
2085
2086         ret = connect(state->fd, &rbsda->u.sa, sa_socklen);
2087         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
2088         if (retry) {
2089                 /* retry later */
2090                 goto async;
2091         }
2092         if (tevent_req_error(req, err)) {
2093                 goto post;
2094         }
2095
2096         tevent_req_done(req);
2097         goto post;
2098
2099  async:
2100         state->fde = tevent_add_fd(ev, state,
2101                                    state->fd,
2102                                    TEVENT_FD_READ | TEVENT_FD_WRITE,
2103                                    tstream_bsd_connect_fde_handler,
2104                                    req);
2105         if (tevent_req_nomem(state->fde, req)) {
2106                 goto post;
2107         }
2108
2109         return req;
2110
2111  post:
2112         tevent_req_post(req, ev);
2113         return req;
2114 }
2115
2116 static void tstream_bsd_connect_fde_handler(struct tevent_context *ev,
2117                                             struct tevent_fd *fde,
2118                                             uint16_t flags,
2119                                             void *private_data)
2120 {
2121         struct tevent_req *req = talloc_get_type_abort(private_data,
2122                                  struct tevent_req);
2123         struct tstream_bsd_connect_state *state = tevent_req_data(req,
2124                                         struct tstream_bsd_connect_state);
2125         int ret;
2126         int error=0;
2127         socklen_t len = sizeof(error);
2128         int err;
2129         bool retry;
2130
2131         ret = getsockopt(state->fd, SOL_SOCKET, SO_ERROR, &error, &len);
2132         if (ret == 0) {
2133                 if (error != 0) {
2134                         errno = error;
2135                         ret = -1;
2136                 }
2137         }
2138         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
2139         if (retry) {
2140                 /* retry later */
2141                 return;
2142         }
2143         if (tevent_req_error(req, err)) {
2144                 return;
2145         }
2146
2147         tevent_req_done(req);
2148 }
2149
2150 static int tstream_bsd_connect_recv(struct tevent_req *req,
2151                                     int *perrno,
2152                                     TALLOC_CTX *mem_ctx,
2153                                     struct tstream_context **stream,
2154                                     const char *location)
2155 {
2156         struct tstream_bsd_connect_state *state = tevent_req_data(req,
2157                                         struct tstream_bsd_connect_state);
2158         int ret;
2159
2160         ret = tsocket_simple_int_recv(req, perrno);
2161         if (ret == 0) {
2162                 ret = _tstream_bsd_existing_socket(mem_ctx,
2163                                                    state->fd,
2164                                                    stream,
2165                                                    location);
2166                 if (ret == -1) {
2167                         *perrno = errno;
2168                         goto done;
2169                 }
2170                 TALLOC_FREE(state->fde);
2171                 state->fd = -1;
2172         }
2173
2174 done:
2175         tevent_req_received(req);
2176         return ret;
2177 }
2178
2179 struct tevent_req * tstream_inet_tcp_connect_send(TALLOC_CTX *mem_ctx,
2180                                         struct tevent_context *ev,
2181                                         const struct tsocket_address *local,
2182                                         const struct tsocket_address *remote)
2183 {
2184         struct tsocket_address_bsd *lbsda =
2185                 talloc_get_type_abort(local->private_data,
2186                 struct tsocket_address_bsd);
2187         struct tevent_req *req;
2188         int sys_errno = 0;
2189
2190         switch (lbsda->u.sa.sa_family) {
2191         case AF_INET:
2192                 break;
2193 #ifdef HAVE_IPV6
2194         case AF_INET6:
2195                 break;
2196 #endif
2197         default:
2198                 sys_errno = EINVAL;
2199                 break;
2200         }
2201
2202         req = tstream_bsd_connect_send(mem_ctx, ev, sys_errno, local, remote);
2203
2204         return req;
2205 }
2206
2207 int _tstream_inet_tcp_connect_recv(struct tevent_req *req,
2208                                    int *perrno,
2209                                    TALLOC_CTX *mem_ctx,
2210                                    struct tstream_context **stream,
2211                                    const char *location)
2212 {
2213         return tstream_bsd_connect_recv(req, perrno, mem_ctx, stream, location);
2214 }
2215
2216 struct tevent_req * tstream_unix_connect_send(TALLOC_CTX *mem_ctx,
2217                                         struct tevent_context *ev,
2218                                         const struct tsocket_address *local,
2219                                         const struct tsocket_address *remote)
2220 {
2221         struct tsocket_address_bsd *lbsda =
2222                 talloc_get_type_abort(local->private_data,
2223                 struct tsocket_address_bsd);
2224         struct tevent_req *req;
2225         int sys_errno = 0;
2226
2227         switch (lbsda->u.sa.sa_family) {
2228         case AF_UNIX:
2229                 break;
2230         default:
2231                 sys_errno = EINVAL;
2232                 break;
2233         }
2234
2235         req = tstream_bsd_connect_send(mem_ctx, ev, sys_errno, local, remote);
2236
2237         return req;
2238 }
2239
2240 int _tstream_unix_connect_recv(struct tevent_req *req,
2241                                       int *perrno,
2242                                       TALLOC_CTX *mem_ctx,
2243                                       struct tstream_context **stream,
2244                                       const char *location)
2245 {
2246         return tstream_bsd_connect_recv(req, perrno, mem_ctx, stream, location);
2247 }
2248
2249 int _tstream_unix_socketpair(TALLOC_CTX *mem_ctx1,
2250                              struct tstream_context **_stream1,
2251                              TALLOC_CTX *mem_ctx2,
2252                              struct tstream_context **_stream2,
2253                              const char *location)
2254 {
2255         int ret;
2256         int fds[2];
2257         int fd1;
2258         int fd2;
2259         struct tstream_context *stream1 = NULL;
2260         struct tstream_context *stream2 = NULL;
2261
2262         ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
2263         if (ret == -1) {
2264                 return -1;
2265         }
2266         fd1 = fds[0];
2267         fd2 = fds[1];
2268
2269         fd1 = tsocket_bsd_common_prepare_fd(fd1, true);
2270         if (fd1 == -1) {
2271                 int sys_errno = errno;
2272                 close(fd2);
2273                 errno = sys_errno;
2274                 return -1;
2275         }
2276
2277         fd2 = tsocket_bsd_common_prepare_fd(fd2, true);
2278         if (fd2 == -1) {
2279                 int sys_errno = errno;
2280                 close(fd1);
2281                 errno = sys_errno;
2282                 return -1;
2283         }
2284
2285         ret = _tstream_bsd_existing_socket(mem_ctx1,
2286                                            fd1,
2287                                            &stream1,
2288                                            location);
2289         if (ret == -1) {
2290                 int sys_errno = errno;
2291                 close(fd1);
2292                 close(fd2);
2293                 errno = sys_errno;
2294                 return -1;
2295         }
2296
2297         ret = _tstream_bsd_existing_socket(mem_ctx2,
2298                                            fd2,
2299                                            &stream2,
2300                                            location);
2301         if (ret == -1) {
2302                 int sys_errno = errno;
2303                 talloc_free(stream1);
2304                 close(fd2);
2305                 errno = sys_errno;
2306                 return -1;
2307         }
2308
2309         *_stream1 = stream1;
2310         *_stream2 = stream2;
2311         return 0;
2312 }
2313