1 /* 2 * Copyright (c) 2001,2002 Damien Miller. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 /* XXX: memleaks */ 26 /* XXX: signed vs unsigned */ 27 /* XXX: remove all logging, only return status codes */ 28 /* XXX: copy between two remote sites */ 29 30 #include "includes.h" 31 RCSID("$OpenBSD: sftp-client.c,v 1.35 2002/09/11 22:41:49 djm Exp $"); 32 33 #include "openbsd-compat/sys-queue.h" 34 35 #include "buffer.h" 36 #include "bufaux.h" 37 #include "getput.h" 38 #include "xmalloc.h" 39 #include "log.h" 40 #include "atomicio.h" 41 42 #include "sftp.h" 43 #include "sftp-common.h" 44 #include "sftp-client.h" 45 46 /* Minimum amount of data to read at at time */ 47 #define MIN_READ_SIZE 512 48 49 struct sftp_conn { 50 int fd_in; 51 int fd_out; 52 u_int transfer_buflen; 53 u_int num_requests; 54 u_int version; 55 u_int msg_id; 56 }; 57 58 static void 59 send_msg(int fd, Buffer *m) 60 { 61 int mlen = buffer_len(m); 62 int len; 63 Buffer oqueue; 64 65 buffer_init(&oqueue); 66 buffer_put_int(&oqueue, mlen); 67 buffer_append(&oqueue, buffer_ptr(m), mlen); 68 buffer_consume(m, mlen); 69 70 len = atomicio(write, fd, buffer_ptr(&oqueue), buffer_len(&oqueue)); 71 if (len <= 0) 72 fatal("Couldn't send packet: %s", strerror(errno)); 73 74 buffer_free(&oqueue); 75 } 76 77 static void 78 get_msg(int fd, Buffer *m) 79 { 80 u_int len, msg_len; 81 unsigned char buf[4096]; 82 83 len = atomicio(read, fd, buf, 4); 84 if (len == 0) 85 fatal("Connection closed"); 86 else if (len == -1) 87 fatal("Couldn't read packet: %s", strerror(errno)); 88 89 msg_len = GET_32BIT(buf); 90 if (msg_len > 256 * 1024) 91 fatal("Received message too long %u", msg_len); 92 93 while (msg_len) { 94 len = atomicio(read, fd, buf, MIN(msg_len, sizeof(buf))); 95 if (len == 0) 96 fatal("Connection closed"); 97 else if (len == -1) 98 fatal("Couldn't read packet: %s", strerror(errno)); 99 100 msg_len -= len; 101 buffer_append(m, buf, len); 102 } 103 } 104 105 static void 106 send_string_request(int fd, u_int id, u_int code, char *s, 107 u_int len) 108 { 109 Buffer msg; 110 111 buffer_init(&msg); 112 buffer_put_char(&msg, code); 113 buffer_put_int(&msg, id); 114 buffer_put_string(&msg, s, len); 115 send_msg(fd, &msg); 116 debug3("Sent message fd %d T:%u I:%u", fd, code, id); 117 buffer_free(&msg); 118 } 119 120 static void 121 send_string_attrs_request(int fd, u_int id, u_int code, char *s, 122 u_int len, Attrib *a) 123 { 124 Buffer msg; 125 126 buffer_init(&msg); 127 buffer_put_char(&msg, code); 128 buffer_put_int(&msg, id); 129 buffer_put_string(&msg, s, len); 130 encode_attrib(&msg, a); 131 send_msg(fd, &msg); 132 debug3("Sent message fd %d T:%u I:%u", fd, code, id); 133 buffer_free(&msg); 134 } 135 136 static u_int 137 get_status(int fd, u_int expected_id) 138 { 139 Buffer msg; 140 u_int type, id, status; 141 142 buffer_init(&msg); 143 get_msg(fd, &msg); 144 type = buffer_get_char(&msg); 145 id = buffer_get_int(&msg); 146 147 if (id != expected_id) 148 fatal("ID mismatch (%u != %u)", id, expected_id); 149 if (type != SSH2_FXP_STATUS) 150 fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u", 151 SSH2_FXP_STATUS, type); 152 153 status = buffer_get_int(&msg); 154 buffer_free(&msg); 155 156 debug3("SSH2_FXP_STATUS %u", status); 157 158 return(status); 159 } 160 161 static char * 162 get_handle(int fd, u_int expected_id, u_int *len) 163 { 164 Buffer msg; 165 u_int type, id; 166 char *handle; 167 168 buffer_init(&msg); 169 get_msg(fd, &msg); 170 type = buffer_get_char(&msg); 171 id = buffer_get_int(&msg); 172 173 if (id != expected_id) 174 fatal("ID mismatch (%u != %u)", id, expected_id); 175 if (type == SSH2_FXP_STATUS) { 176 int status = buffer_get_int(&msg); 177 178 error("Couldn't get handle: %s", fx2txt(status)); 179 return(NULL); 180 } else if (type != SSH2_FXP_HANDLE) 181 fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u", 182 SSH2_FXP_HANDLE, type); 183 184 handle = buffer_get_string(&msg, len); 185 buffer_free(&msg); 186 187 return(handle); 188 } 189 190 static Attrib * 191 get_decode_stat(int fd, u_int expected_id, int quiet) 192 { 193 Buffer msg; 194 u_int type, id; 195 Attrib *a; 196 197 buffer_init(&msg); 198 get_msg(fd, &msg); 199 200 type = buffer_get_char(&msg); 201 id = buffer_get_int(&msg); 202 203 debug3("Received stat reply T:%u I:%u", type, id); 204 if (id != expected_id) 205 fatal("ID mismatch (%u != %u)", id, expected_id); 206 if (type == SSH2_FXP_STATUS) { 207 int status = buffer_get_int(&msg); 208 209 if (quiet) 210 debug("Couldn't stat remote file: %s", fx2txt(status)); 211 else 212 error("Couldn't stat remote file: %s", fx2txt(status)); 213 return(NULL); 214 } else if (type != SSH2_FXP_ATTRS) { 215 fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u", 216 SSH2_FXP_ATTRS, type); 217 } 218 a = decode_attrib(&msg); 219 buffer_free(&msg); 220 221 return(a); 222 } 223 224 struct sftp_conn * 225 do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests) 226 { 227 u_int type; 228 int version; 229 Buffer msg; 230 struct sftp_conn *ret; 231 232 buffer_init(&msg); 233 buffer_put_char(&msg, SSH2_FXP_INIT); 234 buffer_put_int(&msg, SSH2_FILEXFER_VERSION); 235 send_msg(fd_out, &msg); 236 237 buffer_clear(&msg); 238 239 get_msg(fd_in, &msg); 240 241 /* Expecting a VERSION reply */ 242 if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) { 243 error("Invalid packet back from SSH2_FXP_INIT (type %u)", 244 type); 245 buffer_free(&msg); 246 return(NULL); 247 } 248 version = buffer_get_int(&msg); 249 250 debug2("Remote version: %d", version); 251 252 /* Check for extensions */ 253 while (buffer_len(&msg) > 0) { 254 char *name = buffer_get_string(&msg, NULL); 255 char *value = buffer_get_string(&msg, NULL); 256 257 debug2("Init extension: \"%s\"", name); 258 xfree(name); 259 xfree(value); 260 } 261 262 buffer_free(&msg); 263 264 ret = xmalloc(sizeof(*ret)); 265 ret->fd_in = fd_in; 266 ret->fd_out = fd_out; 267 ret->transfer_buflen = transfer_buflen; 268 ret->num_requests = num_requests; 269 ret->version = version; 270 ret->msg_id = 1; 271 272 /* Some filexfer v.0 servers don't support large packets */ 273 if (version == 0) 274 ret->transfer_buflen = MIN(ret->transfer_buflen, 20480); 275 276 return(ret); 277 } 278 279 u_int 280 sftp_proto_version(struct sftp_conn *conn) 281 { 282 return(conn->version); 283 } 284 285 int 286 do_close(struct sftp_conn *conn, char *handle, u_int handle_len) 287 { 288 u_int id, status; 289 Buffer msg; 290 291 buffer_init(&msg); 292 293 id = conn->msg_id++; 294 buffer_put_char(&msg, SSH2_FXP_CLOSE); 295 buffer_put_int(&msg, id); 296 buffer_put_string(&msg, handle, handle_len); 297 send_msg(conn->fd_out, &msg); 298 debug3("Sent message SSH2_FXP_CLOSE I:%u", id); 299 300 status = get_status(conn->fd_in, id); 301 if (status != SSH2_FX_OK) 302 error("Couldn't close file: %s", fx2txt(status)); 303 304 buffer_free(&msg); 305 306 return(status); 307 } 308 309 310 static int 311 do_lsreaddir(struct sftp_conn *conn, char *path, int printflag, 312 SFTP_DIRENT ***dir) 313 { 314 Buffer msg; 315 u_int type, id, handle_len, i, expected_id, ents = 0; 316 char *handle; 317 318 id = conn->msg_id++; 319 320 buffer_init(&msg); 321 buffer_put_char(&msg, SSH2_FXP_OPENDIR); 322 buffer_put_int(&msg, id); 323 buffer_put_cstring(&msg, path); 324 send_msg(conn->fd_out, &msg); 325 326 buffer_clear(&msg); 327 328 handle = get_handle(conn->fd_in, id, &handle_len); 329 if (handle == NULL) 330 return(-1); 331 332 if (dir) { 333 ents = 0; 334 *dir = xmalloc(sizeof(**dir)); 335 (*dir)[0] = NULL; 336 } 337 338 for (;;) { 339 int count; 340 341 id = expected_id = conn->msg_id++; 342 343 debug3("Sending SSH2_FXP_READDIR I:%u", id); 344 345 buffer_clear(&msg); 346 buffer_put_char(&msg, SSH2_FXP_READDIR); 347 buffer_put_int(&msg, id); 348 buffer_put_string(&msg, handle, handle_len); 349 send_msg(conn->fd_out, &msg); 350 351 buffer_clear(&msg); 352 353 get_msg(conn->fd_in, &msg); 354 355 type = buffer_get_char(&msg); 356 id = buffer_get_int(&msg); 357 358 debug3("Received reply T:%u I:%u", type, id); 359 360 if (id != expected_id) 361 fatal("ID mismatch (%u != %u)", id, expected_id); 362 363 if (type == SSH2_FXP_STATUS) { 364 int status = buffer_get_int(&msg); 365 366 debug3("Received SSH2_FXP_STATUS %d", status); 367 368 if (status == SSH2_FX_EOF) { 369 break; 370 } else { 371 error("Couldn't read directory: %s", 372 fx2txt(status)); 373 do_close(conn, handle, handle_len); 374 return(status); 375 } 376 } else if (type != SSH2_FXP_NAME) 377 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", 378 SSH2_FXP_NAME, type); 379 380 count = buffer_get_int(&msg); 381 if (count == 0) 382 break; 383 debug3("Received %d SSH2_FXP_NAME responses", count); 384 for (i = 0; i < count; i++) { 385 char *filename, *longname; 386 Attrib *a; 387 388 filename = buffer_get_string(&msg, NULL); 389 longname = buffer_get_string(&msg, NULL); 390 a = decode_attrib(&msg); 391 392 if (printflag) 393 printf("%s\n", longname); 394 395 if (dir) { 396 *dir = xrealloc(*dir, sizeof(**dir) * 397 (ents + 2)); 398 (*dir)[ents] = xmalloc(sizeof(***dir)); 399 (*dir)[ents]->filename = xstrdup(filename); 400 (*dir)[ents]->longname = xstrdup(longname); 401 memcpy(&(*dir)[ents]->a, a, sizeof(*a)); 402 (*dir)[++ents] = NULL; 403 } 404 405 xfree(filename); 406 xfree(longname); 407 } 408 } 409 410 buffer_free(&msg); 411 do_close(conn, handle, handle_len); 412 xfree(handle); 413 414 return(0); 415 } 416 417 int 418 do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir) 419 { 420 return(do_lsreaddir(conn, path, 0, dir)); 421 } 422 423 void free_sftp_dirents(SFTP_DIRENT **s) 424 { 425 int i; 426 427 for (i = 0; s[i]; i++) { 428 xfree(s[i]->filename); 429 xfree(s[i]->longname); 430 xfree(s[i]); 431 } 432 xfree(s); 433 } 434 435 int 436 do_rm(struct sftp_conn *conn, char *path) 437 { 438 u_int status, id; 439 440 debug2("Sending SSH2_FXP_REMOVE \"%s\"", path); 441 442 id = conn->msg_id++; 443 send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path, 444 strlen(path)); 445 status = get_status(conn->fd_in, id); 446 if (status != SSH2_FX_OK) 447 error("Couldn't delete file: %s", fx2txt(status)); 448 return(status); 449 } 450 451 int 452 do_mkdir(struct sftp_conn *conn, char *path, Attrib *a) 453 { 454 u_int status, id; 455 456 id = conn->msg_id++; 457 send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path, 458 strlen(path), a); 459 460 status = get_status(conn->fd_in, id); 461 if (status != SSH2_FX_OK) 462 error("Couldn't create directory: %s", fx2txt(status)); 463 464 return(status); 465 } 466 467 int 468 do_rmdir(struct sftp_conn *conn, char *path) 469 { 470 u_int status, id; 471 472 id = conn->msg_id++; 473 send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path, 474 strlen(path)); 475 476 status = get_status(conn->fd_in, id); 477 if (status != SSH2_FX_OK) 478 error("Couldn't remove directory: %s", fx2txt(status)); 479 480 return(status); 481 } 482 483 Attrib * 484 do_stat(struct sftp_conn *conn, char *path, int quiet) 485 { 486 u_int id; 487 488 id = conn->msg_id++; 489 490 send_string_request(conn->fd_out, id, 491 conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT, 492 path, strlen(path)); 493 494 return(get_decode_stat(conn->fd_in, id, quiet)); 495 } 496 497 Attrib * 498 do_lstat(struct sftp_conn *conn, char *path, int quiet) 499 { 500 u_int id; 501 502 if (conn->version == 0) { 503 if (quiet) 504 debug("Server version does not support lstat operation"); 505 else 506 log("Server version does not support lstat operation"); 507 return(do_stat(conn, path, quiet)); 508 } 509 510 id = conn->msg_id++; 511 send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path, 512 strlen(path)); 513 514 return(get_decode_stat(conn->fd_in, id, quiet)); 515 } 516 517 Attrib * 518 do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet) 519 { 520 u_int id; 521 522 id = conn->msg_id++; 523 send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle, 524 handle_len); 525 526 return(get_decode_stat(conn->fd_in, id, quiet)); 527 } 528 529 int 530 do_setstat(struct sftp_conn *conn, char *path, Attrib *a) 531 { 532 u_int status, id; 533 534 id = conn->msg_id++; 535 send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path, 536 strlen(path), a); 537 538 status = get_status(conn->fd_in, id); 539 if (status != SSH2_FX_OK) 540 error("Couldn't setstat on \"%s\": %s", path, 541 fx2txt(status)); 542 543 return(status); 544 } 545 546 int 547 do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len, 548 Attrib *a) 549 { 550 u_int status, id; 551 552 id = conn->msg_id++; 553 send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle, 554 handle_len, a); 555 556 status = get_status(conn->fd_in, id); 557 if (status != SSH2_FX_OK) 558 error("Couldn't fsetstat: %s", fx2txt(status)); 559 560 return(status); 561 } 562 563 char * 564 do_realpath(struct sftp_conn *conn, char *path) 565 { 566 Buffer msg; 567 u_int type, expected_id, count, id; 568 char *filename, *longname; 569 Attrib *a; 570 571 expected_id = id = conn->msg_id++; 572 send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path, 573 strlen(path)); 574 575 buffer_init(&msg); 576 577 get_msg(conn->fd_in, &msg); 578 type = buffer_get_char(&msg); 579 id = buffer_get_int(&msg); 580 581 if (id != expected_id) 582 fatal("ID mismatch (%u != %u)", id, expected_id); 583 584 if (type == SSH2_FXP_STATUS) { 585 u_int status = buffer_get_int(&msg); 586 587 error("Couldn't canonicalise: %s", fx2txt(status)); 588 return(NULL); 589 } else if (type != SSH2_FXP_NAME) 590 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", 591 SSH2_FXP_NAME, type); 592 593 count = buffer_get_int(&msg); 594 if (count != 1) 595 fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count); 596 597 filename = buffer_get_string(&msg, NULL); 598 longname = buffer_get_string(&msg, NULL); 599 a = decode_attrib(&msg); 600 601 debug3("SSH_FXP_REALPATH %s -> %s", path, filename); 602 603 xfree(longname); 604 605 buffer_free(&msg); 606 607 return(filename); 608 } 609 610 int 611 do_rename(struct sftp_conn *conn, char *oldpath, char *newpath) 612 { 613 Buffer msg; 614 u_int status, id; 615 616 buffer_init(&msg); 617 618 /* Send rename request */ 619 id = conn->msg_id++; 620 buffer_put_char(&msg, SSH2_FXP_RENAME); 621 buffer_put_int(&msg, id); 622 buffer_put_cstring(&msg, oldpath); 623 buffer_put_cstring(&msg, newpath); 624 send_msg(conn->fd_out, &msg); 625 debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath, 626 newpath); 627 buffer_free(&msg); 628 629 status = get_status(conn->fd_in, id); 630 if (status != SSH2_FX_OK) 631 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, 632 newpath, fx2txt(status)); 633 634 return(status); 635 } 636 637 int 638 do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath) 639 { 640 Buffer msg; 641 u_int status, id; 642 643 if (conn->version < 3) { 644 error("This server does not support the symlink operation"); 645 return(SSH2_FX_OP_UNSUPPORTED); 646 } 647 648 buffer_init(&msg); 649 650 /* Send rename request */ 651 id = conn->msg_id++; 652 buffer_put_char(&msg, SSH2_FXP_SYMLINK); 653 buffer_put_int(&msg, id); 654 buffer_put_cstring(&msg, oldpath); 655 buffer_put_cstring(&msg, newpath); 656 send_msg(conn->fd_out, &msg); 657 debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath, 658 newpath); 659 buffer_free(&msg); 660 661 status = get_status(conn->fd_in, id); 662 if (status != SSH2_FX_OK) 663 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, 664 newpath, fx2txt(status)); 665 666 return(status); 667 } 668 669 char * 670 do_readlink(struct sftp_conn *conn, char *path) 671 { 672 Buffer msg; 673 u_int type, expected_id, count, id; 674 char *filename, *longname; 675 Attrib *a; 676 677 expected_id = id = conn->msg_id++; 678 send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path, 679 strlen(path)); 680 681 buffer_init(&msg); 682 683 get_msg(conn->fd_in, &msg); 684 type = buffer_get_char(&msg); 685 id = buffer_get_int(&msg); 686 687 if (id != expected_id) 688 fatal("ID mismatch (%u != %u)", id, expected_id); 689 690 if (type == SSH2_FXP_STATUS) { 691 u_int status = buffer_get_int(&msg); 692 693 error("Couldn't readlink: %s", fx2txt(status)); 694 return(NULL); 695 } else if (type != SSH2_FXP_NAME) 696 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", 697 SSH2_FXP_NAME, type); 698 699 count = buffer_get_int(&msg); 700 if (count != 1) 701 fatal("Got multiple names (%d) from SSH_FXP_READLINK", count); 702 703 filename = buffer_get_string(&msg, NULL); 704 longname = buffer_get_string(&msg, NULL); 705 a = decode_attrib(&msg); 706 707 debug3("SSH_FXP_READLINK %s -> %s", path, filename); 708 709 xfree(longname); 710 711 buffer_free(&msg); 712 713 return(filename); 714 } 715 716 static void 717 send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len, 718 char *handle, u_int handle_len) 719 { 720 Buffer msg; 721 722 buffer_init(&msg); 723 buffer_clear(&msg); 724 buffer_put_char(&msg, SSH2_FXP_READ); 725 buffer_put_int(&msg, id); 726 buffer_put_string(&msg, handle, handle_len); 727 buffer_put_int64(&msg, offset); 728 buffer_put_int(&msg, len); 729 send_msg(fd_out, &msg); 730 buffer_free(&msg); 731 } 732 733 int 734 do_download(struct sftp_conn *conn, char *remote_path, char *local_path, 735 int pflag) 736 { 737 Attrib junk, *a; 738 Buffer msg; 739 char *handle; 740 int local_fd, status, num_req, max_req, write_error; 741 int read_error, write_errno; 742 u_int64_t offset, size; 743 u_int handle_len, mode, type, id, buflen; 744 struct request { 745 u_int id; 746 u_int len; 747 u_int64_t offset; 748 TAILQ_ENTRY(request) tq; 749 }; 750 TAILQ_HEAD(reqhead, request) requests; 751 struct request *req; 752 753 TAILQ_INIT(&requests); 754 755 a = do_stat(conn, remote_path, 0); 756 if (a == NULL) 757 return(-1); 758 759 /* XXX: should we preserve set[ug]id? */ 760 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) 761 mode = S_IWRITE | (a->perm & 0777); 762 else 763 mode = 0666; 764 765 if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) && 766 (a->perm & S_IFDIR)) { 767 error("Cannot download a directory: %s", remote_path); 768 return(-1); 769 } 770 771 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) 772 size = a->size; 773 else 774 size = 0; 775 776 buflen = conn->transfer_buflen; 777 buffer_init(&msg); 778 779 /* Send open request */ 780 id = conn->msg_id++; 781 buffer_put_char(&msg, SSH2_FXP_OPEN); 782 buffer_put_int(&msg, id); 783 buffer_put_cstring(&msg, remote_path); 784 buffer_put_int(&msg, SSH2_FXF_READ); 785 attrib_clear(&junk); /* Send empty attributes */ 786 encode_attrib(&msg, &junk); 787 send_msg(conn->fd_out, &msg); 788 debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); 789 790 handle = get_handle(conn->fd_in, id, &handle_len); 791 if (handle == NULL) { 792 buffer_free(&msg); 793 return(-1); 794 } 795 796 local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, mode); 797 if (local_fd == -1) { 798 error("Couldn't open local file \"%s\" for writing: %s", 799 local_path, strerror(errno)); 800 buffer_free(&msg); 801 xfree(handle); 802 return(-1); 803 } 804 805 /* Read from remote and write to local */ 806 write_error = read_error = write_errno = num_req = offset = 0; 807 max_req = 1; 808 while (num_req > 0 || max_req > 0) { 809 char *data; 810 u_int len; 811 812 /* Send some more requests */ 813 while (num_req < max_req) { 814 debug3("Request range %llu -> %llu (%d/%d)", 815 (unsigned long long)offset, 816 (unsigned long long)offset + buflen - 1, 817 num_req, max_req); 818 req = xmalloc(sizeof(*req)); 819 req->id = conn->msg_id++; 820 req->len = buflen; 821 req->offset = offset; 822 offset += buflen; 823 num_req++; 824 TAILQ_INSERT_TAIL(&requests, req, tq); 825 send_read_request(conn->fd_out, req->id, req->offset, 826 req->len, handle, handle_len); 827 } 828 829 buffer_clear(&msg); 830 get_msg(conn->fd_in, &msg); 831 type = buffer_get_char(&msg); 832 id = buffer_get_int(&msg); 833 debug3("Received reply T:%u I:%u R:%d", type, id, max_req); 834 835 /* Find the request in our queue */ 836 for(req = TAILQ_FIRST(&requests); 837 req != NULL && req->id != id; 838 req = TAILQ_NEXT(req, tq)) 839 ; 840 if (req == NULL) 841 fatal("Unexpected reply %u", id); 842 843 switch (type) { 844 case SSH2_FXP_STATUS: 845 status = buffer_get_int(&msg); 846 if (status != SSH2_FX_EOF) 847 read_error = 1; 848 max_req = 0; 849 TAILQ_REMOVE(&requests, req, tq); 850 xfree(req); 851 num_req--; 852 break; 853 case SSH2_FXP_DATA: 854 data = buffer_get_string(&msg, &len); 855 debug3("Received data %llu -> %llu", 856 (unsigned long long)req->offset, 857 (unsigned long long)req->offset + len - 1); 858 if (len > req->len) 859 fatal("Received more data than asked for " 860 "%u > %u", len, req->len); 861 if ((lseek(local_fd, req->offset, SEEK_SET) == -1 || 862 atomicio(write, local_fd, data, len) != len) && 863 !write_error) { 864 write_errno = errno; 865 write_error = 1; 866 max_req = 0; 867 } 868 xfree(data); 869 870 if (len == req->len) { 871 TAILQ_REMOVE(&requests, req, tq); 872 xfree(req); 873 num_req--; 874 } else { 875 /* Resend the request for the missing data */ 876 debug3("Short data block, re-requesting " 877 "%llu -> %llu (%2d)", 878 (unsigned long long)req->offset + len, 879 (unsigned long long)req->offset + 880 req->len - 1, num_req); 881 req->id = conn->msg_id++; 882 req->len -= len; 883 req->offset += len; 884 send_read_request(conn->fd_out, req->id, 885 req->offset, req->len, handle, handle_len); 886 /* Reduce the request size */ 887 if (len < buflen) 888 buflen = MAX(MIN_READ_SIZE, len); 889 } 890 if (max_req > 0) { /* max_req = 0 iff EOF received */ 891 if (size > 0 && offset > size) { 892 /* Only one request at a time 893 * after the expected EOF */ 894 debug3("Finish at %llu (%2d)", 895 (unsigned long long)offset, 896 num_req); 897 max_req = 1; 898 } 899 else if (max_req < conn->num_requests + 1) { 900 ++max_req; 901 } 902 } 903 break; 904 default: 905 fatal("Expected SSH2_FXP_DATA(%u) packet, got %u", 906 SSH2_FXP_DATA, type); 907 } 908 } 909 910 /* Sanity check */ 911 if (TAILQ_FIRST(&requests) != NULL) 912 fatal("Transfer complete, but requests still in queue"); 913 914 if (read_error) { 915 error("Couldn't read from remote file \"%s\" : %s", 916 remote_path, fx2txt(status)); 917 do_close(conn, handle, handle_len); 918 } else if (write_error) { 919 error("Couldn't write to \"%s\": %s", local_path, 920 strerror(write_errno)); 921 status = -1; 922 do_close(conn, handle, handle_len); 923 } else { 924 status = do_close(conn, handle, handle_len); 925 926 /* Override umask and utimes if asked */ 927 #ifdef HAVE_FCHMOD 928 if (pflag && fchmod(local_fd, mode) == -1) 929 #else 930 if (pflag && chmod(local_path, mode) == -1) 931 #endif /* HAVE_FCHMOD */ 932 error("Couldn't set mode on \"%s\": %s", local_path, 933 strerror(errno)); 934 if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) { 935 struct timeval tv[2]; 936 tv[0].tv_sec = a->atime; 937 tv[1].tv_sec = a->mtime; 938 tv[0].tv_usec = tv[1].tv_usec = 0; 939 if (utimes(local_path, tv) == -1) 940 error("Can't set times on \"%s\": %s", 941 local_path, strerror(errno)); 942 } 943 } 944 close(local_fd); 945 buffer_free(&msg); 946 xfree(handle); 947 948 return(status); 949 } 950 951 int 952 do_upload(struct sftp_conn *conn, char *local_path, char *remote_path, 953 int pflag) 954 { 955 int local_fd, status; 956 u_int handle_len, id, type; 957 u_int64_t offset; 958 char *handle, *data; 959 Buffer msg; 960 struct stat sb; 961 Attrib a; 962 u_int32_t startid; 963 u_int32_t ackid; 964 struct outstanding_ack { 965 u_int id; 966 u_int len; 967 u_int64_t offset; 968 TAILQ_ENTRY(outstanding_ack) tq; 969 }; 970 TAILQ_HEAD(ackhead, outstanding_ack) acks; 971 struct outstanding_ack *ack; 972 973 TAILQ_INIT(&acks); 974 975 if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) { 976 error("Couldn't open local file \"%s\" for reading: %s", 977 local_path, strerror(errno)); 978 return(-1); 979 } 980 if (fstat(local_fd, &sb) == -1) { 981 error("Couldn't fstat local file \"%s\": %s", 982 local_path, strerror(errno)); 983 close(local_fd); 984 return(-1); 985 } 986 stat_to_attrib(&sb, &a); 987 988 a.flags &= ~SSH2_FILEXFER_ATTR_SIZE; 989 a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID; 990 a.perm &= 0777; 991 if (!pflag) 992 a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME; 993 994 buffer_init(&msg); 995 996 /* Send open request */ 997 id = conn->msg_id++; 998 buffer_put_char(&msg, SSH2_FXP_OPEN); 999 buffer_put_int(&msg, id); 1000 buffer_put_cstring(&msg, remote_path); 1001 buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC); 1002 encode_attrib(&msg, &a); 1003 send_msg(conn->fd_out, &msg); 1004 debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); 1005 1006 buffer_clear(&msg); 1007 1008 handle = get_handle(conn->fd_in, id, &handle_len); 1009 if (handle == NULL) { 1010 close(local_fd); 1011 buffer_free(&msg); 1012 return(-1); 1013 } 1014 1015 startid = ackid = id + 1; 1016 data = xmalloc(conn->transfer_buflen); 1017 1018 /* Read from local and write to remote */ 1019 offset = 0; 1020 for (;;) { 1021 int len; 1022 1023 /* 1024 * Can't use atomicio here because it returns 0 on EOF, thus losing 1025 * the last block of the file 1026 */ 1027 do 1028 len = read(local_fd, data, conn->transfer_buflen); 1029 while ((len == -1) && (errno == EINTR || errno == EAGAIN)); 1030 1031 if (len == -1) 1032 fatal("Couldn't read from \"%s\": %s", local_path, 1033 strerror(errno)); 1034 1035 if (len != 0) { 1036 ack = xmalloc(sizeof(*ack)); 1037 ack->id = ++id; 1038 ack->offset = offset; 1039 ack->len = len; 1040 TAILQ_INSERT_TAIL(&acks, ack, tq); 1041 1042 buffer_clear(&msg); 1043 buffer_put_char(&msg, SSH2_FXP_WRITE); 1044 buffer_put_int(&msg, ack->id); 1045 buffer_put_string(&msg, handle, handle_len); 1046 buffer_put_int64(&msg, offset); 1047 buffer_put_string(&msg, data, len); 1048 send_msg(conn->fd_out, &msg); 1049 debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u", 1050 id, (unsigned long long)offset, len); 1051 } else if (TAILQ_FIRST(&acks) == NULL) 1052 break; 1053 1054 if (ack == NULL) 1055 fatal("Unexpected ACK %u", id); 1056 1057 if (id == startid || len == 0 || 1058 id - ackid >= conn->num_requests) { 1059 u_int r_id; 1060 1061 buffer_clear(&msg); 1062 get_msg(conn->fd_in, &msg); 1063 type = buffer_get_char(&msg); 1064 r_id = buffer_get_int(&msg); 1065 1066 if (type != SSH2_FXP_STATUS) 1067 fatal("Expected SSH2_FXP_STATUS(%d) packet, " 1068 "got %d", SSH2_FXP_STATUS, type); 1069 1070 status = buffer_get_int(&msg); 1071 debug3("SSH2_FXP_STATUS %d", status); 1072 1073 /* Find the request in our queue */ 1074 for(ack = TAILQ_FIRST(&acks); 1075 ack != NULL && ack->id != r_id; 1076 ack = TAILQ_NEXT(ack, tq)) 1077 ; 1078 if (ack == NULL) 1079 fatal("Can't find request for ID %u", r_id); 1080 TAILQ_REMOVE(&acks, ack, tq); 1081 1082 if (status != SSH2_FX_OK) { 1083 error("Couldn't write to remote file \"%s\": %s", 1084 remote_path, fx2txt(status)); 1085 do_close(conn, handle, handle_len); 1086 close(local_fd); 1087 goto done; 1088 } 1089 debug3("In write loop, ack for %u %u bytes at %llu", 1090 ack->id, ack->len, (unsigned long long)ack->offset); 1091 ++ackid; 1092 xfree(ack); 1093 } 1094 offset += len; 1095 } 1096 xfree(data); 1097 1098 if (close(local_fd) == -1) { 1099 error("Couldn't close local file \"%s\": %s", local_path, 1100 strerror(errno)); 1101 do_close(conn, handle, handle_len); 1102 status = -1; 1103 goto done; 1104 } 1105 1106 /* Override umask and utimes if asked */ 1107 if (pflag) 1108 do_fsetstat(conn, handle, handle_len, &a); 1109 1110 status = do_close(conn, handle, handle_len); 1111 1112 done: 1113 xfree(handle); 1114 buffer_free(&msg); 1115 return(status); 1116 } 1117