sftp-client.c

   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 1.33 2002/06/23 09:30:14 deraadt Exp $");
  32
  33 #include "openbsd-compat/fake-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_ls(struct sftp_conn *conn, char *path)
 419 {
 420         return(do_lsreaddir(conn, path, 1, NULL));
 421 }
 422
 423 int
 424 do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir)
 425 {
 426         return(do_lsreaddir(conn, path, 0, dir));
 427 }
 428
 429 void free_sftp_dirents(SFTP_DIRENT **s)
 430 {
 431         int i;
 432
 433         for (i = 0; s[i]; i++) {
 434                 xfree(s[i]->filename);
 435                 xfree(s[i]->longname);
 436                 xfree(s[i]);
 437         }
 438         xfree(s);
 439 }
 440
 441 int
 442 do_rm(struct sftp_conn *conn, char *path)
 443 {
 444         u_int status, id;
 445
 446         debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
 447
 448         id = conn->msg_id++;
 449         send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path,
 450             strlen(path));
 451         status = get_status(conn->fd_in, id);
 452         if (status != SSH2_FX_OK)
 453                 error("Couldn't delete file: %s", fx2txt(status));
 454         return(status);
 455 }
 456
 457 int
 458 do_mkdir(struct sftp_conn *conn, char *path, Attrib *a)
 459 {
 460         u_int status, id;
 461
 462         id = conn->msg_id++;
 463         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path,
 464             strlen(path), a);
 465
 466         status = get_status(conn->fd_in, id);
 467         if (status != SSH2_FX_OK)
 468                 error("Couldn't create directory: %s", fx2txt(status));
 469
 470         return(status);
 471 }
 472
 473 int
 474 do_rmdir(struct sftp_conn *conn, char *path)
 475 {
 476         u_int status, id;
 477
 478         id = conn->msg_id++;
 479         send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path,
 480             strlen(path));
 481
 482         status = get_status(conn->fd_in, id);
 483         if (status != SSH2_FX_OK)
 484                 error("Couldn't remove directory: %s", fx2txt(status));
 485
 486         return(status);
 487 }
 488
 489 Attrib *
 490 do_stat(struct sftp_conn *conn, char *path, int quiet)
 491 {
 492         u_int id;
 493
 494         id = conn->msg_id++;
 495
 496         send_string_request(conn->fd_out, id,
 497             conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT,
 498             path, strlen(path));
 499
 500         return(get_decode_stat(conn->fd_in, id, quiet));
 501 }
 502
 503 Attrib *
 504 do_lstat(struct sftp_conn *conn, char *path, int quiet)
 505 {
 506         u_int id;
 507
 508         if (conn->version == 0) {
 509                 if (quiet)
 510                         debug("Server version does not support lstat operation");
 511                 else
 512                         log("Server version does not support lstat operation");
 513                 return(do_stat(conn, path, quiet));
 514         }
 515
 516         id = conn->msg_id++;
 517         send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path,
 518             strlen(path));
 519
 520         return(get_decode_stat(conn->fd_in, id, quiet));
 521 }
 522
 523 Attrib *
 524 do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet)
 525 {
 526         u_int id;
 527
 528         id = conn->msg_id++;
 529         send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle,
 530             handle_len);
 531
 532         return(get_decode_stat(conn->fd_in, id, quiet));
 533 }
 534
 535 int
 536 do_setstat(struct sftp_conn *conn, char *path, Attrib *a)
 537 {
 538         u_int status, id;
 539
 540         id = conn->msg_id++;
 541         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path,
 542             strlen(path), a);
 543
 544         status = get_status(conn->fd_in, id);
 545         if (status != SSH2_FX_OK)
 546                 error("Couldn't setstat on \"%s\": %s", path,
 547                     fx2txt(status));
 548
 549         return(status);
 550 }
 551
 552 int
 553 do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len,
 554     Attrib *a)
 555 {
 556         u_int status, id;
 557
 558         id = conn->msg_id++;
 559         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle,
 560             handle_len, a);
 561
 562         status = get_status(conn->fd_in, id);
 563         if (status != SSH2_FX_OK)
 564                 error("Couldn't fsetstat: %s", fx2txt(status));
 565
 566         return(status);
 567 }
 568
 569 char *
 570 do_realpath(struct sftp_conn *conn, char *path)
 571 {
 572         Buffer msg;
 573         u_int type, expected_id, count, id;
 574         char *filename, *longname;
 575         Attrib *a;
 576
 577         expected_id = id = conn->msg_id++;
 578         send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path,
 579             strlen(path));
 580
 581         buffer_init(&msg);
 582
 583         get_msg(conn->fd_in, &msg);
 584         type = buffer_get_char(&msg);
 585         id = buffer_get_int(&msg);
 586
 587         if (id != expected_id)
 588                 fatal("ID mismatch (%u != %u)", id, expected_id);
 589
 590         if (type == SSH2_FXP_STATUS) {
 591                 u_int status = buffer_get_int(&msg);
 592
 593                 error("Couldn't canonicalise: %s", fx2txt(status));
 594                 return(NULL);
 595         } else if (type != SSH2_FXP_NAME)
 596                 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 597                     SSH2_FXP_NAME, type);
 598
 599         count = buffer_get_int(&msg);
 600         if (count != 1)
 601                 fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count);
 602
 603         filename = buffer_get_string(&msg, NULL);
 604         longname = buffer_get_string(&msg, NULL);
 605         a = decode_attrib(&msg);
 606
 607         debug3("SSH_FXP_REALPATH %s -> %s", path, filename);
 608
 609         xfree(longname);
 610
 611         buffer_free(&msg);
 612
 613         return(filename);
 614 }
 615
 616 int
 617 do_rename(struct sftp_conn *conn, char *oldpath, char *newpath)
 618 {
 619         Buffer msg;
 620         u_int status, id;
 621
 622         buffer_init(&msg);
 623
 624         /* Send rename request */
 625         id = conn->msg_id++;
 626         buffer_put_char(&msg, SSH2_FXP_RENAME);
 627         buffer_put_int(&msg, id);
 628         buffer_put_cstring(&msg, oldpath);
 629         buffer_put_cstring(&msg, newpath);
 630         send_msg(conn->fd_out, &msg);
 631         debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath,
 632             newpath);
 633         buffer_free(&msg);
 634
 635         status = get_status(conn->fd_in, id);
 636         if (status != SSH2_FX_OK)
 637                 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
 638                     newpath, fx2txt(status));
 639
 640         return(status);
 641 }
 642
 643 int
 644 do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath)
 645 {
 646         Buffer msg;
 647         u_int status, id;
 648
 649         if (conn->version < 3) {
 650                 error("This server does not support the symlink operation");
 651                 return(SSH2_FX_OP_UNSUPPORTED);
 652         }
 653
 654         buffer_init(&msg);
 655
 656         /* Send rename request */
 657         id = conn->msg_id++;
 658         buffer_put_char(&msg, SSH2_FXP_SYMLINK);
 659         buffer_put_int(&msg, id);
 660         buffer_put_cstring(&msg, oldpath);
 661         buffer_put_cstring(&msg, newpath);
 662         send_msg(conn->fd_out, &msg);
 663         debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath,
 664             newpath);
 665         buffer_free(&msg);
 666
 667         status = get_status(conn->fd_in, id);
 668         if (status != SSH2_FX_OK)
 669                 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
 670                     newpath, fx2txt(status));
 671
 672         return(status);
 673 }
 674
 675 char *
 676 do_readlink(struct sftp_conn *conn, char *path)
 677 {
 678         Buffer msg;
 679         u_int type, expected_id, count, id;
 680         char *filename, *longname;
 681         Attrib *a;
 682
 683         expected_id = id = conn->msg_id++;
 684         send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path,
 685             strlen(path));
 686
 687         buffer_init(&msg);
 688
 689         get_msg(conn->fd_in, &msg);
 690         type = buffer_get_char(&msg);
 691         id = buffer_get_int(&msg);
 692
 693         if (id != expected_id)
 694                 fatal("ID mismatch (%u != %u)", id, expected_id);
 695
 696         if (type == SSH2_FXP_STATUS) {
 697                 u_int status = buffer_get_int(&msg);
 698
 699                 error("Couldn't readlink: %s", fx2txt(status));
 700                 return(NULL);
 701         } else if (type != SSH2_FXP_NAME)
 702                 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 703                     SSH2_FXP_NAME, type);
 704
 705         count = buffer_get_int(&msg);
 706         if (count != 1)
 707                 fatal("Got multiple names (%d) from SSH_FXP_READLINK", count);
 708
 709         filename = buffer_get_string(&msg, NULL);
 710         longname = buffer_get_string(&msg, NULL);
 711         a = decode_attrib(&msg);
 712
 713         debug3("SSH_FXP_READLINK %s -> %s", path, filename);
 714
 715         xfree(longname);
 716
 717         buffer_free(&msg);
 718
 719         return(filename);
 720 }
 721
 722 static void
 723 send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len,
 724     char *handle, u_int handle_len)
 725 {
 726         Buffer msg;
 727
 728         buffer_init(&msg);
 729         buffer_clear(&msg);
 730         buffer_put_char(&msg, SSH2_FXP_READ);
 731         buffer_put_int(&msg, id);
 732         buffer_put_string(&msg, handle, handle_len);
 733         buffer_put_int64(&msg, offset);
 734         buffer_put_int(&msg, len);
 735         send_msg(fd_out, &msg);
 736         buffer_free(&msg);
 737 }
 738
 739 int
 740 do_download(struct sftp_conn *conn, char *remote_path, char *local_path,
 741     int pflag)
 742 {
 743         Attrib junk, *a;
 744         Buffer msg;
 745         char *handle;
 746         int local_fd, status, num_req, max_req, write_error;
 747         int read_error, write_errno;
 748         u_int64_t offset, size;
 749         u_int handle_len, mode, type, id, buflen;
 750         struct request {
 751                 u_int id;
 752                 u_int len;
 753                 u_int64_t offset;
 754                 TAILQ_ENTRY(request) tq;
 755         };
 756         TAILQ_HEAD(reqhead, request) requests;
 757         struct request *req;
 758
 759         TAILQ_INIT(&requests);
 760
 761         a = do_stat(conn, remote_path, 0);
 762         if (a == NULL)
 763                 return(-1);
 764
 765         /* XXX: should we preserve set[ug]id? */
 766         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 767                 mode = S_IWRITE | (a->perm & 0777);
 768         else
 769                 mode = 0666;
 770
 771         if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
 772             (a->perm & S_IFDIR)) {
 773                 error("Cannot download a directory: %s", remote_path);
 774                 return(-1);
 775         }
 776
 777         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
 778                 size = a->size;
 779         else
 780                 size = 0;
 781
 782         buflen = conn->transfer_buflen;
 783         buffer_init(&msg);
 784
 785         /* Send open request */
 786         id = conn->msg_id++;
 787         buffer_put_char(&msg, SSH2_FXP_OPEN);
 788         buffer_put_int(&msg, id);
 789         buffer_put_cstring(&msg, remote_path);
 790         buffer_put_int(&msg, SSH2_FXF_READ);
 791         attrib_clear(&junk); /* Send empty attributes */
 792         encode_attrib(&msg, &junk);
 793         send_msg(conn->fd_out, &msg);
 794         debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
 795
 796         handle = get_handle(conn->fd_in, id, &handle_len);
 797         if (handle == NULL) {
 798                 buffer_free(&msg);
 799                 return(-1);
 800         }
 801
 802         local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, mode);
 803         if (local_fd == -1) {
 804                 error("Couldn't open local file \"%s\" for writing: %s",
 805                     local_path, strerror(errno));
 806                 buffer_free(&msg);
 807                 xfree(handle);
 808                 return(-1);
 809         }
 810
 811         /* Read from remote and write to local */
 812         write_error = read_error = write_errno = num_req = offset = 0;
 813         max_req = 1;
 814         while (num_req > 0 || max_req > 0) {
 815                 char *data;
 816                 u_int len;
 817
 818                 /* Send some more requests */
 819                 while (num_req < max_req) {
 820                         debug3("Request range %llu -> %llu (%d/%d)",
 821                             (unsigned long long)offset,
 822                             (unsigned long long)offset + buflen - 1,
 823                             num_req, max_req);
 824                         req = xmalloc(sizeof(*req));
 825                         req->id = conn->msg_id++;
 826                         req->len = buflen;
 827                         req->offset = offset;
 828                         offset += buflen;
 829                         num_req++;
 830                         TAILQ_INSERT_TAIL(&requests, req, tq);
 831                         send_read_request(conn->fd_out, req->id, req->offset,
 832                             req->len, handle, handle_len);
 833                 }
 834
 835                 buffer_clear(&msg);
 836                 get_msg(conn->fd_in, &msg);
 837                 type = buffer_get_char(&msg);
 838                 id = buffer_get_int(&msg);
 839                 debug3("Received reply T:%u I:%u R:%d", type, id, max_req);
 840
 841                 /* Find the request in our queue */
 842                 for(req = TAILQ_FIRST(&requests);
 843                     req != NULL && req->id != id;
 844                     req = TAILQ_NEXT(req, tq))
 845                         ;
 846                 if (req == NULL)
 847                         fatal("Unexpected reply %u", id);
 848
 849                 switch (type) {
 850                 case SSH2_FXP_STATUS:
 851                         status = buffer_get_int(&msg);
 852                         if (status != SSH2_FX_EOF)
 853                                 read_error = 1;
 854                         max_req = 0;
 855                         TAILQ_REMOVE(&requests, req, tq);
 856                         xfree(req);
 857                         num_req--;
 858                         break;
 859                 case SSH2_FXP_DATA:
 860                         data = buffer_get_string(&msg, &len);
 861                         debug3("Received data %llu -> %llu",
 862                             (unsigned long long)req->offset,
 863                             (unsigned long long)req->offset + len - 1);
 864                         if (len > req->len)
 865                                 fatal("Received more data than asked for "
 866                                       "%u > %u", len, req->len);
 867                         if ((lseek(local_fd, req->offset, SEEK_SET) == -1 ||
 868                              atomicio(write, local_fd, data, len) != len) &&
 869                             !write_error) {
 870                                 write_errno = errno;
 871                                 write_error = 1;
 872                                 max_req = 0;
 873                         }
 874                         xfree(data);
 875
 876                         if (len == req->len) {
 877                                 TAILQ_REMOVE(&requests, req, tq);
 878                                 xfree(req);
 879                                 num_req--;
 880                         } else {
 881                                 /* Resend the request for the missing data */
 882                                 debug3("Short data block, re-requesting "
 883                                     "%llu -> %llu (%2d)",
 884                                     (unsigned long long)req->offset + len,
 885                                     (unsigned long long)req->offset +
 886                                     req->len - 1, num_req);
 887                                 req->id = conn->msg_id++;
 888                                 req->len -= len;
 889                                 req->offset += len;
 890                                 send_read_request(conn->fd_out, req->id,
 891                                     req->offset, req->len, handle, handle_len);
 892                                 /* Reduce the request size */
 893                                 if (len < buflen)
 894                                         buflen = MAX(MIN_READ_SIZE, len);
 895                         }
 896                         if (max_req > 0) { /* max_req = 0 iff EOF received */
 897                                 if (size > 0 && offset > size) {
 898                                         /* Only one request at a time
 899                                          * after the expected EOF */
 900                                         debug3("Finish at %llu (%2d)",
 901                                             (unsigned long long)offset,
 902                                             num_req);
 903                                         max_req = 1;
 904                                 }
 905                                 else if (max_req < conn->num_requests + 1) {
 906                                         ++max_req;
 907                                 }
 908                         }
 909                         break;
 910                 default:
 911                         fatal("Expected SSH2_FXP_DATA(%u) packet, got %u",
 912                             SSH2_FXP_DATA, type);
 913                 }
 914         }
 915
 916         /* Sanity check */
 917         if (TAILQ_FIRST(&requests) != NULL)
 918                 fatal("Transfer complete, but requests still in queue");
 919
 920         if (read_error) {
 921                 error("Couldn't read from remote file \"%s\" : %s",
 922                     remote_path, fx2txt(status));
 923                 do_close(conn, handle, handle_len);
 924         } else if (write_error) {
 925                 error("Couldn't write to \"%s\": %s", local_path,
 926                     strerror(write_errno));
 927                 status = -1;
 928                 do_close(conn, handle, handle_len);
 929         } else {
 930                 status = do_close(conn, handle, handle_len);
 931
 932                 /* Override umask and utimes if asked */
 933 #ifdef HAVE_FCHMOD
 934                 if (pflag && fchmod(local_fd, mode) == -1)
 935 #else
 936                 if (pflag && chmod(local_path, mode) == -1)
 937 #endif /* HAVE_FCHMOD */
 938                         error("Couldn't set mode on \"%s\": %s", local_path,
 939                               strerror(errno));
 940                 if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) {
 941                         struct timeval tv[2];
 942                         tv[0].tv_sec = a->atime;
 943                         tv[1].tv_sec = a->mtime;
 944                         tv[0].tv_usec = tv[1].tv_usec = 0;
 945                         if (utimes(local_path, tv) == -1)
 946                                 error("Can't set times on \"%s\": %s",
 947                                       local_path, strerror(errno));
 948                 }
 949         }
 950         close(local_fd);
 951         buffer_free(&msg);
 952         xfree(handle);
 953
 954         return(status);
 955 }
 956
 957 int
 958 do_upload(struct sftp_conn *conn, char *local_path, char *remote_path,
 959     int pflag)
 960 {
 961         int local_fd, status;
 962         u_int handle_len, id, type;
 963         u_int64_t offset;
 964         char *handle, *data;
 965         Buffer msg;
 966         struct stat sb;
 967         Attrib a;
 968         u_int32_t startid;
 969         u_int32_t ackid;
 970         struct outstanding_ack {
 971                 u_int id;
 972                 u_int len;
 973                 u_int64_t offset;
 974                 TAILQ_ENTRY(outstanding_ack) tq;
 975         };
 976         TAILQ_HEAD(ackhead, outstanding_ack) acks;
 977         struct outstanding_ack *ack;
 978
 979         TAILQ_INIT(&acks);
 980
 981         if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) {
 982                 error("Couldn't open local file \"%s\" for reading: %s",
 983                     local_path, strerror(errno));
 984                 return(-1);
 985         }
 986         if (fstat(local_fd, &sb) == -1) {
 987                 error("Couldn't fstat local file \"%s\": %s",
 988                     local_path, strerror(errno));
 989                 close(local_fd);
 990                 return(-1);
 991         }
 992         stat_to_attrib(&sb, &a);
 993
 994         a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
 995         a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
 996         a.perm &= 0777;
 997         if (!pflag)
 998                 a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
 999
1000         buffer_init(&msg);
1001
1002         /* Send open request */
1003         id = conn->msg_id++;
1004         buffer_put_char(&msg, SSH2_FXP_OPEN);
1005         buffer_put_int(&msg, id);
1006         buffer_put_cstring(&msg, remote_path);
1007         buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC);
1008         encode_attrib(&msg, &a);
1009         send_msg(conn->fd_out, &msg);
1010         debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
1011
1012         buffer_clear(&msg);
1013
1014         handle = get_handle(conn->fd_in, id, &handle_len);
1015         if (handle == NULL) {
1016                 close(local_fd);
1017                 buffer_free(&msg);
1018                 return(-1);
1019         }
1020
1021         startid = ackid = id + 1;
1022         data = xmalloc(conn->transfer_buflen);
1023
1024         /* Read from local and write to remote */
1025         offset = 0;
1026         for (;;) {
1027                 int len;
1028
1029                 /*
1030                  * Can't use atomicio here because it returns 0 on EOF, thus losing
1031                  * the last block of the file
1032                  */
1033                 do
1034                         len = read(local_fd, data, conn->transfer_buflen);
1035                 while ((len == -1) && (errno == EINTR || errno == EAGAIN));
1036
1037                 if (len == -1)
1038                         fatal("Couldn't read from \"%s\": %s", local_path,
1039                             strerror(errno));
1040
1041                 if (len != 0) {
1042                         ack = xmalloc(sizeof(*ack));
1043                         ack->id = ++id;
1044                         ack->offset = offset;
1045                         ack->len = len;
1046                         TAILQ_INSERT_TAIL(&acks, ack, tq);
1047
1048                         buffer_clear(&msg);
1049                         buffer_put_char(&msg, SSH2_FXP_WRITE);
1050                         buffer_put_int(&msg, ack->id);
1051                         buffer_put_string(&msg, handle, handle_len);
1052                         buffer_put_int64(&msg, offset);
1053                         buffer_put_string(&msg, data, len);
1054                         send_msg(conn->fd_out, &msg);
1055                         debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u",
1056                                id, (unsigned long long)offset, len);
1057                 } else if (TAILQ_FIRST(&acks) == NULL)
1058                         break;
1059
1060                 if (ack == NULL)
1061                         fatal("Unexpected ACK %u", id);
1062
1063                 if (id == startid || len == 0 ||
1064                     id - ackid >= conn->num_requests) {
1065                         u_int r_id;
1066
1067                         buffer_clear(&msg);
1068                         get_msg(conn->fd_in, &msg);
1069                         type = buffer_get_char(&msg);
1070                         r_id = buffer_get_int(&msg);
1071
1072                         if (type != SSH2_FXP_STATUS)
1073                                 fatal("Expected SSH2_FXP_STATUS(%d) packet, "
1074                                     "got %d", SSH2_FXP_STATUS, type);
1075
1076                         status = buffer_get_int(&msg);
1077                         debug3("SSH2_FXP_STATUS %d", status);
1078
1079                         /* Find the request in our queue */
1080                         for(ack = TAILQ_FIRST(&acks);
1081                             ack != NULL && ack->id != r_id;
1082                             ack = TAILQ_NEXT(ack, tq))
1083                                 ;
1084                         if (ack == NULL)
1085                                 fatal("Can't find request for ID %u", r_id);
1086                         TAILQ_REMOVE(&acks, ack, tq);
1087
1088                         if (status != SSH2_FX_OK) {
1089                                 error("Couldn't write to remote file \"%s\": %s",
1090                                       remote_path, fx2txt(status));
1091                                 do_close(conn, handle, handle_len);
1092                                 close(local_fd);
1093                                 goto done;
1094                         }
1095                         debug3("In write loop, ack for %u %u bytes at %llu",
1096                            ack->id, ack->len, (unsigned long long)ack->offset);
1097                         ++ackid;
1098                         free(ack);
1099                 }
1100                 offset += len;
1101         }
1102         xfree(data);
1103
1104         if (close(local_fd) == -1) {
1105                 error("Couldn't close local file \"%s\": %s", local_path,
1106                     strerror(errno));
1107                 do_close(conn, handle, handle_len);
1108                 status = -1;
1109                 goto done;
1110         }
1111
1112         /* Override umask and utimes if asked */
1113         if (pflag)
1114                 do_fsetstat(conn, handle, handle_len, &a);
1115
1116         status = do_close(conn, handle, handle_len);
1117
1118 done:
1119         xfree(handle);
1120         buffer_free(&msg);
1121         return(status);
1122 }