sftp-client.c

   1 /*
   2  * Copyright (c) 2001-2003 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 1.42 2003/03/05 22:33:43 markus 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 #include "progressmeter.h"
  42
  43 #include "sftp.h"
  44 #include "sftp-common.h"
  45 #include "sftp-client.h"
  46
  47 extern int showprogress;
  48
  49 /* Minimum amount of data to read at at time */
  50 #define MIN_READ_SIZE   512
  51
  52 /* Maximum packet size */
  53 #define MAX_MSG_LENGTH  (256 * 1024)
  54
  55 struct sftp_conn {
  56         int fd_in;
  57         int fd_out;
  58         u_int transfer_buflen;
  59         u_int num_requests;
  60         u_int version;
  61         u_int msg_id;
  62 };
  63
  64 static void
  65 send_msg(int fd, Buffer *m)
  66 {
  67         u_char mlen[4];
  68
  69         if (buffer_len(m) > MAX_MSG_LENGTH)
  70                 fatal("Outbound message too long %u", buffer_len(m));
  71
  72         /* Send length first */
  73         PUT_32BIT(mlen, buffer_len(m));
  74         if (atomicio(write, fd, mlen, sizeof(mlen)) <= 0)
  75                 fatal("Couldn't send packet: %s", strerror(errno));
  76
  77         if (atomicio(write, fd, buffer_ptr(m), buffer_len(m)) <= 0)
  78                 fatal("Couldn't send packet: %s", strerror(errno));
  79
  80         buffer_clear(m);
  81 }
  82
  83 static void
  84 get_msg(int fd, Buffer *m)
  85 {
  86         ssize_t len;
  87         u_int msg_len;
  88
  89         buffer_append_space(m, 4);
  90         len = atomicio(read, fd, buffer_ptr(m), 4);
  91         if (len == 0)
  92                 fatal("Connection closed");
  93         else if (len == -1)
  94                 fatal("Couldn't read packet: %s", strerror(errno));
  95
  96         msg_len = buffer_get_int(m);
  97         if (msg_len > MAX_MSG_LENGTH)
  98                 fatal("Received message too long %u", msg_len);
  99
 100         buffer_append_space(m, msg_len);
 101         len = atomicio(read, fd, buffer_ptr(m), msg_len);
 102         if (len == 0)
 103                 fatal("Connection closed");
 104         else if (len == -1)
 105                 fatal("Read packet: %s", strerror(errno));
 106 }
 107
 108 static void
 109 send_string_request(int fd, u_int id, u_int code, char *s,
 110     u_int len)
 111 {
 112         Buffer msg;
 113
 114         buffer_init(&msg);
 115         buffer_put_char(&msg, code);
 116         buffer_put_int(&msg, id);
 117         buffer_put_string(&msg, s, len);
 118         send_msg(fd, &msg);
 119         debug3("Sent message fd %d T:%u I:%u", fd, code, id);
 120         buffer_free(&msg);
 121 }
 122
 123 static void
 124 send_string_attrs_request(int fd, u_int id, u_int code, char *s,
 125     u_int len, Attrib *a)
 126 {
 127         Buffer msg;
 128
 129         buffer_init(&msg);
 130         buffer_put_char(&msg, code);
 131         buffer_put_int(&msg, id);
 132         buffer_put_string(&msg, s, len);
 133         encode_attrib(&msg, a);
 134         send_msg(fd, &msg);
 135         debug3("Sent message fd %d T:%u I:%u", fd, code, id);
 136         buffer_free(&msg);
 137 }
 138
 139 static u_int
 140 get_status(int fd, u_int expected_id)
 141 {
 142         Buffer msg;
 143         u_int type, id, status;
 144
 145         buffer_init(&msg);
 146         get_msg(fd, &msg);
 147         type = buffer_get_char(&msg);
 148         id = buffer_get_int(&msg);
 149
 150         if (id != expected_id)
 151                 fatal("ID mismatch (%u != %u)", id, expected_id);
 152         if (type != SSH2_FXP_STATUS)
 153                 fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u",
 154                     SSH2_FXP_STATUS, type);
 155
 156         status = buffer_get_int(&msg);
 157         buffer_free(&msg);
 158
 159         debug3("SSH2_FXP_STATUS %u", status);
 160
 161         return(status);
 162 }
 163
 164 static char *
 165 get_handle(int fd, u_int expected_id, u_int *len)
 166 {
 167         Buffer msg;
 168         u_int type, id;
 169         char *handle;
 170
 171         buffer_init(&msg);
 172         get_msg(fd, &msg);
 173         type = buffer_get_char(&msg);
 174         id = buffer_get_int(&msg);
 175
 176         if (id != expected_id)
 177                 fatal("ID mismatch (%u != %u)", id, expected_id);
 178         if (type == SSH2_FXP_STATUS) {
 179                 int status = buffer_get_int(&msg);
 180
 181                 error("Couldn't get handle: %s", fx2txt(status));
 182                 return(NULL);
 183         } else if (type != SSH2_FXP_HANDLE)
 184                 fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u",
 185                     SSH2_FXP_HANDLE, type);
 186
 187         handle = buffer_get_string(&msg, len);
 188         buffer_free(&msg);
 189
 190         return(handle);
 191 }
 192
 193 static Attrib *
 194 get_decode_stat(int fd, u_int expected_id, int quiet)
 195 {
 196         Buffer msg;
 197         u_int type, id;
 198         Attrib *a;
 199
 200         buffer_init(&msg);
 201         get_msg(fd, &msg);
 202
 203         type = buffer_get_char(&msg);
 204         id = buffer_get_int(&msg);
 205
 206         debug3("Received stat reply T:%u I:%u", type, id);
 207         if (id != expected_id)
 208                 fatal("ID mismatch (%u != %u)", id, expected_id);
 209         if (type == SSH2_FXP_STATUS) {
 210                 int status = buffer_get_int(&msg);
 211
 212                 if (quiet)
 213                         debug("Couldn't stat remote file: %s", fx2txt(status));
 214                 else
 215                         error("Couldn't stat remote file: %s", fx2txt(status));
 216                 return(NULL);
 217         } else if (type != SSH2_FXP_ATTRS) {
 218                 fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u",
 219                     SSH2_FXP_ATTRS, type);
 220         }
 221         a = decode_attrib(&msg);
 222         buffer_free(&msg);
 223
 224         return(a);
 225 }
 226
 227 struct sftp_conn *
 228 do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests)
 229 {
 230         u_int type;
 231         int version;
 232         Buffer msg;
 233         struct sftp_conn *ret;
 234
 235         buffer_init(&msg);
 236         buffer_put_char(&msg, SSH2_FXP_INIT);
 237         buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
 238         send_msg(fd_out, &msg);
 239
 240         buffer_clear(&msg);
 241
 242         get_msg(fd_in, &msg);
 243
 244         /* Expecting a VERSION reply */
 245         if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) {
 246                 error("Invalid packet back from SSH2_FXP_INIT (type %u)",
 247                     type);
 248                 buffer_free(&msg);
 249                 return(NULL);
 250         }
 251         version = buffer_get_int(&msg);
 252
 253         debug2("Remote version: %d", version);
 254
 255         /* Check for extensions */
 256         while (buffer_len(&msg) > 0) {
 257                 char *name = buffer_get_string(&msg, NULL);
 258                 char *value = buffer_get_string(&msg, NULL);
 259
 260                 debug2("Init extension: \"%s\"", name);
 261                 xfree(name);
 262                 xfree(value);
 263         }
 264
 265         buffer_free(&msg);
 266
 267         ret = xmalloc(sizeof(*ret));
 268         ret->fd_in = fd_in;
 269         ret->fd_out = fd_out;
 270         ret->transfer_buflen = transfer_buflen;
 271         ret->num_requests = num_requests;
 272         ret->version = version;
 273         ret->msg_id = 1;
 274
 275         /* Some filexfer v.0 servers don't support large packets */
 276         if (version == 0)
 277                 ret->transfer_buflen = MIN(ret->transfer_buflen, 20480);
 278
 279         return(ret);
 280 }
 281
 282 u_int
 283 sftp_proto_version(struct sftp_conn *conn)
 284 {
 285         return(conn->version);
 286 }
 287
 288 int
 289 do_close(struct sftp_conn *conn, char *handle, u_int handle_len)
 290 {
 291         u_int id, status;
 292         Buffer msg;
 293
 294         buffer_init(&msg);
 295
 296         id = conn->msg_id++;
 297         buffer_put_char(&msg, SSH2_FXP_CLOSE);
 298         buffer_put_int(&msg, id);
 299         buffer_put_string(&msg, handle, handle_len);
 300         send_msg(conn->fd_out, &msg);
 301         debug3("Sent message SSH2_FXP_CLOSE I:%u", id);
 302
 303         status = get_status(conn->fd_in, id);
 304         if (status != SSH2_FX_OK)
 305                 error("Couldn't close file: %s", fx2txt(status));
 306
 307         buffer_free(&msg);
 308
 309         return(status);
 310 }
 311
 312
 313 static int
 314 do_lsreaddir(struct sftp_conn *conn, char *path, int printflag,
 315     SFTP_DIRENT ***dir)
 316 {
 317         Buffer msg;
 318         u_int type, id, handle_len, i, expected_id, ents = 0;
 319         char *handle;
 320
 321         id = conn->msg_id++;
 322
 323         buffer_init(&msg);
 324         buffer_put_char(&msg, SSH2_FXP_OPENDIR);
 325         buffer_put_int(&msg, id);
 326         buffer_put_cstring(&msg, path);
 327         send_msg(conn->fd_out, &msg);
 328
 329         buffer_clear(&msg);
 330
 331         handle = get_handle(conn->fd_in, id, &handle_len);
 332         if (handle == NULL)
 333                 return(-1);
 334
 335         if (dir) {
 336                 ents = 0;
 337                 *dir = xmalloc(sizeof(**dir));
 338                 (*dir)[0] = NULL;
 339         }
 340
 341         for (;;) {
 342                 int count;
 343
 344                 id = expected_id = conn->msg_id++;
 345
 346                 debug3("Sending SSH2_FXP_READDIR I:%u", id);
 347
 348                 buffer_clear(&msg);
 349                 buffer_put_char(&msg, SSH2_FXP_READDIR);
 350                 buffer_put_int(&msg, id);
 351                 buffer_put_string(&msg, handle, handle_len);
 352                 send_msg(conn->fd_out, &msg);
 353
 354                 buffer_clear(&msg);
 355
 356                 get_msg(conn->fd_in, &msg);
 357
 358                 type = buffer_get_char(&msg);
 359                 id = buffer_get_int(&msg);
 360
 361                 debug3("Received reply T:%u I:%u", type, id);
 362
 363                 if (id != expected_id)
 364                         fatal("ID mismatch (%u != %u)", id, expected_id);
 365
 366                 if (type == SSH2_FXP_STATUS) {
 367                         int status = buffer_get_int(&msg);
 368
 369                         debug3("Received SSH2_FXP_STATUS %d", status);
 370
 371                         if (status == SSH2_FX_EOF) {
 372                                 break;
 373                         } else {
 374                                 error("Couldn't read directory: %s",
 375                                     fx2txt(status));
 376                                 do_close(conn, handle, handle_len);
 377                                 xfree(handle);
 378                                 return(status);
 379                         }
 380                 } else if (type != SSH2_FXP_NAME)
 381                         fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 382                             SSH2_FXP_NAME, type);
 383
 384                 count = buffer_get_int(&msg);
 385                 if (count == 0)
 386                         break;
 387                 debug3("Received %d SSH2_FXP_NAME responses", count);
 388                 for (i = 0; i < count; i++) {
 389                         char *filename, *longname;
 390                         Attrib *a;
 391
 392                         filename = buffer_get_string(&msg, NULL);
 393                         longname = buffer_get_string(&msg, NULL);
 394                         a = decode_attrib(&msg);
 395
 396                         if (printflag)
 397                                 printf("%s\n", longname);
 398
 399                         if (dir) {
 400                                 *dir = xrealloc(*dir, sizeof(**dir) *
 401                                     (ents + 2));
 402                                 (*dir)[ents] = xmalloc(sizeof(***dir));
 403                                 (*dir)[ents]->filename = xstrdup(filename);
 404                                 (*dir)[ents]->longname = xstrdup(longname);
 405                                 memcpy(&(*dir)[ents]->a, a, sizeof(*a));
 406                                 (*dir)[++ents] = NULL;
 407                         }
 408
 409                         xfree(filename);
 410                         xfree(longname);
 411                 }
 412         }
 413
 414         buffer_free(&msg);
 415         do_close(conn, handle, handle_len);
 416         xfree(handle);
 417
 418         return(0);
 419 }
 420
 421 int
 422 do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir)
 423 {
 424         return(do_lsreaddir(conn, path, 0, dir));
 425 }
 426
 427 void free_sftp_dirents(SFTP_DIRENT **s)
 428 {
 429         int i;
 430
 431         for (i = 0; s[i]; i++) {
 432                 xfree(s[i]->filename);
 433                 xfree(s[i]->longname);
 434                 xfree(s[i]);
 435         }
 436         xfree(s);
 437 }
 438
 439 int
 440 do_rm(struct sftp_conn *conn, char *path)
 441 {
 442         u_int status, id;
 443
 444         debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
 445
 446         id = conn->msg_id++;
 447         send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path,
 448             strlen(path));
 449         status = get_status(conn->fd_in, id);
 450         if (status != SSH2_FX_OK)
 451                 error("Couldn't delete file: %s", fx2txt(status));
 452         return(status);
 453 }
 454
 455 int
 456 do_mkdir(struct sftp_conn *conn, char *path, Attrib *a)
 457 {
 458         u_int status, id;
 459
 460         id = conn->msg_id++;
 461         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path,
 462             strlen(path), a);
 463
 464         status = get_status(conn->fd_in, id);
 465         if (status != SSH2_FX_OK)
 466                 error("Couldn't create directory: %s", fx2txt(status));
 467
 468         return(status);
 469 }
 470
 471 int
 472 do_rmdir(struct sftp_conn *conn, char *path)
 473 {
 474         u_int status, id;
 475
 476         id = conn->msg_id++;
 477         send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path,
 478             strlen(path));
 479
 480         status = get_status(conn->fd_in, id);
 481         if (status != SSH2_FX_OK)
 482                 error("Couldn't remove directory: %s", fx2txt(status));
 483
 484         return(status);
 485 }
 486
 487 Attrib *
 488 do_stat(struct sftp_conn *conn, char *path, int quiet)
 489 {
 490         u_int id;
 491
 492         id = conn->msg_id++;
 493
 494         send_string_request(conn->fd_out, id,
 495             conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT,
 496             path, strlen(path));
 497
 498         return(get_decode_stat(conn->fd_in, id, quiet));
 499 }
 500
 501 Attrib *
 502 do_lstat(struct sftp_conn *conn, char *path, int quiet)
 503 {
 504         u_int id;
 505
 506         if (conn->version == 0) {
 507                 if (quiet)
 508                         debug("Server version does not support lstat operation");
 509                 else
 510                         log("Server version does not support lstat operation");
 511                 return(do_stat(conn, path, quiet));
 512         }
 513
 514         id = conn->msg_id++;
 515         send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path,
 516             strlen(path));
 517
 518         return(get_decode_stat(conn->fd_in, id, quiet));
 519 }
 520
 521 Attrib *
 522 do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet)
 523 {
 524         u_int id;
 525
 526         id = conn->msg_id++;
 527         send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle,
 528             handle_len);
 529
 530         return(get_decode_stat(conn->fd_in, id, quiet));
 531 }
 532
 533 int
 534 do_setstat(struct sftp_conn *conn, char *path, Attrib *a)
 535 {
 536         u_int status, id;
 537
 538         id = conn->msg_id++;
 539         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path,
 540             strlen(path), a);
 541
 542         status = get_status(conn->fd_in, id);
 543         if (status != SSH2_FX_OK)
 544                 error("Couldn't setstat on \"%s\": %s", path,
 545                     fx2txt(status));
 546
 547         return(status);
 548 }
 549
 550 int
 551 do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len,
 552     Attrib *a)
 553 {
 554         u_int status, id;
 555
 556         id = conn->msg_id++;
 557         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle,
 558             handle_len, a);
 559
 560         status = get_status(conn->fd_in, id);
 561         if (status != SSH2_FX_OK)
 562                 error("Couldn't fsetstat: %s", fx2txt(status));
 563
 564         return(status);
 565 }
 566
 567 char *
 568 do_realpath(struct sftp_conn *conn, char *path)
 569 {
 570         Buffer msg;
 571         u_int type, expected_id, count, id;
 572         char *filename, *longname;
 573         Attrib *a;
 574
 575         expected_id = id = conn->msg_id++;
 576         send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path,
 577             strlen(path));
 578
 579         buffer_init(&msg);
 580
 581         get_msg(conn->fd_in, &msg);
 582         type = buffer_get_char(&msg);
 583         id = buffer_get_int(&msg);
 584
 585         if (id != expected_id)
 586                 fatal("ID mismatch (%u != %u)", id, expected_id);
 587
 588         if (type == SSH2_FXP_STATUS) {
 589                 u_int status = buffer_get_int(&msg);
 590
 591                 error("Couldn't canonicalise: %s", fx2txt(status));
 592                 return(NULL);
 593         } else if (type != SSH2_FXP_NAME)
 594                 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 595                     SSH2_FXP_NAME, type);
 596
 597         count = buffer_get_int(&msg);
 598         if (count != 1)
 599                 fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count);
 600
 601         filename = buffer_get_string(&msg, NULL);
 602         longname = buffer_get_string(&msg, NULL);
 603         a = decode_attrib(&msg);
 604
 605         debug3("SSH_FXP_REALPATH %s -> %s", path, filename);
 606
 607         xfree(longname);
 608
 609         buffer_free(&msg);
 610
 611         return(filename);
 612 }
 613
 614 int
 615 do_rename(struct sftp_conn *conn, char *oldpath, char *newpath)
 616 {
 617         Buffer msg;
 618         u_int status, id;
 619
 620         buffer_init(&msg);
 621
 622         /* Send rename request */
 623         id = conn->msg_id++;
 624         buffer_put_char(&msg, SSH2_FXP_RENAME);
 625         buffer_put_int(&msg, id);
 626         buffer_put_cstring(&msg, oldpath);
 627         buffer_put_cstring(&msg, newpath);
 628         send_msg(conn->fd_out, &msg);
 629         debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath,
 630             newpath);
 631         buffer_free(&msg);
 632
 633         status = get_status(conn->fd_in, id);
 634         if (status != SSH2_FX_OK)
 635                 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
 636                     newpath, fx2txt(status));
 637
 638         return(status);
 639 }
 640
 641 int
 642 do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath)
 643 {
 644         Buffer msg;
 645         u_int status, id;
 646
 647         if (conn->version < 3) {
 648                 error("This server does not support the symlink operation");
 649                 return(SSH2_FX_OP_UNSUPPORTED);
 650         }
 651
 652         buffer_init(&msg);
 653
 654         /* Send rename request */
 655         id = conn->msg_id++;
 656         buffer_put_char(&msg, SSH2_FXP_SYMLINK);
 657         buffer_put_int(&msg, id);
 658         buffer_put_cstring(&msg, oldpath);
 659         buffer_put_cstring(&msg, newpath);
 660         send_msg(conn->fd_out, &msg);
 661         debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath,
 662             newpath);
 663         buffer_free(&msg);
 664
 665         status = get_status(conn->fd_in, id);
 666         if (status != SSH2_FX_OK)
 667                 error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath,
 668                     newpath, fx2txt(status));
 669
 670         return(status);
 671 }
 672
 673 char *
 674 do_readlink(struct sftp_conn *conn, char *path)
 675 {
 676         Buffer msg;
 677         u_int type, expected_id, count, id;
 678         char *filename, *longname;
 679         Attrib *a;
 680
 681         expected_id = id = conn->msg_id++;
 682         send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path,
 683             strlen(path));
 684
 685         buffer_init(&msg);
 686
 687         get_msg(conn->fd_in, &msg);
 688         type = buffer_get_char(&msg);
 689         id = buffer_get_int(&msg);
 690
 691         if (id != expected_id)
 692                 fatal("ID mismatch (%u != %u)", id, expected_id);
 693
 694         if (type == SSH2_FXP_STATUS) {
 695                 u_int status = buffer_get_int(&msg);
 696
 697                 error("Couldn't readlink: %s", fx2txt(status));
 698                 return(NULL);
 699         } else if (type != SSH2_FXP_NAME)
 700                 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 701                     SSH2_FXP_NAME, type);
 702
 703         count = buffer_get_int(&msg);
 704         if (count != 1)
 705                 fatal("Got multiple names (%d) from SSH_FXP_READLINK", count);
 706
 707         filename = buffer_get_string(&msg, NULL);
 708         longname = buffer_get_string(&msg, NULL);
 709         a = decode_attrib(&msg);
 710
 711         debug3("SSH_FXP_READLINK %s -> %s", path, filename);
 712
 713         xfree(longname);
 714
 715         buffer_free(&msg);
 716
 717         return(filename);
 718 }
 719
 720 static void
 721 send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len,
 722     char *handle, u_int handle_len)
 723 {
 724         Buffer msg;
 725
 726         buffer_init(&msg);
 727         buffer_clear(&msg);
 728         buffer_put_char(&msg, SSH2_FXP_READ);
 729         buffer_put_int(&msg, id);
 730         buffer_put_string(&msg, handle, handle_len);
 731         buffer_put_int64(&msg, offset);
 732         buffer_put_int(&msg, len);
 733         send_msg(fd_out, &msg);
 734         buffer_free(&msg);
 735 }
 736
 737 int
 738 do_download(struct sftp_conn *conn, char *remote_path, char *local_path,
 739     int pflag)
 740 {
 741         Attrib junk, *a;
 742         Buffer msg;
 743         char *handle;
 744         int local_fd, status, num_req, max_req, write_error;
 745         int read_error, write_errno;
 746         u_int64_t offset, size;
 747         u_int handle_len, mode, type, id, buflen;
 748         off_t progress_counter;
 749         struct request {
 750                 u_int id;
 751                 u_int len;
 752                 u_int64_t offset;
 753                 TAILQ_ENTRY(request) tq;
 754         };
 755         TAILQ_HEAD(reqhead, request) requests;
 756         struct request *req;
 757
 758         TAILQ_INIT(&requests);
 759
 760         a = do_stat(conn, remote_path, 0);
 761         if (a == NULL)
 762                 return(-1);
 763
 764         /* XXX: should we preserve set[ug]id? */
 765         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 766                 mode = a->perm & 0777;
 767         else
 768                 mode = 0666;
 769
 770         if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
 771             (!S_ISREG(a->perm))) {
 772                 error("Cannot download non-regular file: %s", remote_path);
 773                 return(-1);
 774         }
 775
 776         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
 777                 size = a->size;
 778         else
 779                 size = 0;
 780
 781         buflen = conn->transfer_buflen;
 782         buffer_init(&msg);
 783
 784         /* Send open request */
 785         id = conn->msg_id++;
 786         buffer_put_char(&msg, SSH2_FXP_OPEN);
 787         buffer_put_int(&msg, id);
 788         buffer_put_cstring(&msg, remote_path);
 789         buffer_put_int(&msg, SSH2_FXF_READ);
 790         attrib_clear(&junk); /* Send empty attributes */
 791         encode_attrib(&msg, &junk);
 792         send_msg(conn->fd_out, &msg);
 793         debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
 794
 795         handle = get_handle(conn->fd_in, id, &handle_len);
 796         if (handle == NULL) {
 797                 buffer_free(&msg);
 798                 return(-1);
 799         }
 800
 801         local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC,
 802             mode | S_IWRITE);
 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         progress_counter = 0;
 815
 816         if (showprogress) {
 817                 if (size)
 818                         start_progress_meter(remote_path, size,
 819                             &progress_counter);
 820                 else
 821                         printf("Fetching %s to %s\n", remote_path, local_path);
 822         }
 823
 824         while (num_req > 0 || max_req > 0) {
 825                 char *data;
 826                 u_int len;
 827
 828                 /* Send some more requests */
 829                 while (num_req < max_req) {
 830                         debug3("Request range %llu -> %llu (%d/%d)",
 831                             (unsigned long long)offset,
 832                             (unsigned long long)offset + buflen - 1,
 833                             num_req, max_req);
 834                         req = xmalloc(sizeof(*req));
 835                         req->id = conn->msg_id++;
 836                         req->len = buflen;
 837                         req->offset = offset;
 838                         offset += buflen;
 839                         num_req++;
 840                         TAILQ_INSERT_TAIL(&requests, req, tq);
 841                         send_read_request(conn->fd_out, req->id, req->offset,
 842                             req->len, handle, handle_len);
 843                 }
 844
 845                 buffer_clear(&msg);
 846                 get_msg(conn->fd_in, &msg);
 847                 type = buffer_get_char(&msg);
 848                 id = buffer_get_int(&msg);
 849                 debug3("Received reply T:%u I:%u R:%d", type, id, max_req);
 850
 851                 /* Find the request in our queue */
 852                 for(req = TAILQ_FIRST(&requests);
 853                     req != NULL && req->id != id;
 854                     req = TAILQ_NEXT(req, tq))
 855                         ;
 856                 if (req == NULL)
 857                         fatal("Unexpected reply %u", id);
 858
 859                 switch (type) {
 860                 case SSH2_FXP_STATUS:
 861                         status = buffer_get_int(&msg);
 862                         if (status != SSH2_FX_EOF)
 863                                 read_error = 1;
 864                         max_req = 0;
 865                         TAILQ_REMOVE(&requests, req, tq);
 866                         xfree(req);
 867                         num_req--;
 868                         break;
 869                 case SSH2_FXP_DATA:
 870                         data = buffer_get_string(&msg, &len);
 871                         debug3("Received data %llu -> %llu",
 872                             (unsigned long long)req->offset,
 873                             (unsigned long long)req->offset + len - 1);
 874                         if (len > req->len)
 875                                 fatal("Received more data than asked for "
 876                                     "%u > %u", len, req->len);
 877                         if ((lseek(local_fd, req->offset, SEEK_SET) == -1 ||
 878                             atomicio(write, local_fd, data, len) != len) &&
 879                             !write_error) {
 880                                 write_errno = errno;
 881                                 write_error = 1;
 882                                 max_req = 0;
 883                         }
 884                         progress_counter += len;
 885                         xfree(data);
 886
 887                         if (len == req->len) {
 888                                 TAILQ_REMOVE(&requests, req, tq);
 889                                 xfree(req);
 890                                 num_req--;
 891                         } else {
 892                                 /* Resend the request for the missing data */
 893                                 debug3("Short data block, re-requesting "
 894                                     "%llu -> %llu (%2d)",
 895                                     (unsigned long long)req->offset + len,
 896                                     (unsigned long long)req->offset +
 897                                     req->len - 1, num_req);
 898                                 req->id = conn->msg_id++;
 899                                 req->len -= len;
 900                                 req->offset += len;
 901                                 send_read_request(conn->fd_out, req->id,
 902                                     req->offset, req->len, handle, handle_len);
 903                                 /* Reduce the request size */
 904                                 if (len < buflen)
 905                                         buflen = MAX(MIN_READ_SIZE, len);
 906                         }
 907                         if (max_req > 0) { /* max_req = 0 iff EOF received */
 908                                 if (size > 0 && offset > size) {
 909                                         /* Only one request at a time
 910                                          * after the expected EOF */
 911                                         debug3("Finish at %llu (%2d)",
 912                                             (unsigned long long)offset,
 913                                             num_req);
 914                                         max_req = 1;
 915                                 }
 916                                 else if (max_req < conn->num_requests + 1) {
 917                                         ++max_req;
 918                                 }
 919                         }
 920                         break;
 921                 default:
 922                         fatal("Expected SSH2_FXP_DATA(%u) packet, got %u",
 923                             SSH2_FXP_DATA, type);
 924                 }
 925         }
 926
 927         if (showprogress && size)
 928                 stop_progress_meter();
 929
 930         /* Sanity check */
 931         if (TAILQ_FIRST(&requests) != NULL)
 932                 fatal("Transfer complete, but requests still in queue");
 933
 934         if (read_error) {
 935                 error("Couldn't read from remote file \"%s\" : %s",
 936                     remote_path, fx2txt(status));
 937                 do_close(conn, handle, handle_len);
 938         } else if (write_error) {
 939                 error("Couldn't write to \"%s\": %s", local_path,
 940                     strerror(write_errno));
 941                 status = -1;
 942                 do_close(conn, handle, handle_len);
 943         } else {
 944                 status = do_close(conn, handle, handle_len);
 945
 946                 /* Override umask and utimes if asked */
 947 #ifdef HAVE_FCHMOD
 948                 if (pflag && fchmod(local_fd, mode) == -1)
 949 #else
 950                 if (pflag && chmod(local_path, mode) == -1)
 951 #endif /* HAVE_FCHMOD */
 952                         error("Couldn't set mode on \"%s\": %s", local_path,
 953                             strerror(errno));
 954                 if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) {
 955                         struct timeval tv[2];
 956                         tv[0].tv_sec = a->atime;
 957                         tv[1].tv_sec = a->mtime;
 958                         tv[0].tv_usec = tv[1].tv_usec = 0;
 959                         if (utimes(local_path, tv) == -1)
 960                                 error("Can't set times on \"%s\": %s",
 961                                     local_path, strerror(errno));
 962                 }
 963         }
 964         close(local_fd);
 965         buffer_free(&msg);
 966         xfree(handle);
 967
 968         return(status);
 969 }
 970
 971 int
 972 do_upload(struct sftp_conn *conn, char *local_path, char *remote_path,
 973     int pflag)
 974 {
 975         int local_fd, status;
 976         u_int handle_len, id, type;
 977         u_int64_t offset;
 978         char *handle, *data;
 979         Buffer msg;
 980         struct stat sb;
 981         Attrib a;
 982         u_int32_t startid;
 983         u_int32_t ackid;
 984         struct outstanding_ack {
 985                 u_int id;
 986                 u_int len;
 987                 u_int64_t offset;
 988                 TAILQ_ENTRY(outstanding_ack) tq;
 989         };
 990         TAILQ_HEAD(ackhead, outstanding_ack) acks;
 991         struct outstanding_ack *ack;
 992
 993         TAILQ_INIT(&acks);
 994
 995         if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) {
 996                 error("Couldn't open local file \"%s\" for reading: %s",
 997                     local_path, strerror(errno));
 998                 return(-1);
 999         }
1000         if (fstat(local_fd, &sb) == -1) {
1001                 error("Couldn't fstat local file \"%s\": %s",
1002                     local_path, strerror(errno));
1003                 close(local_fd);
1004                 return(-1);
1005         }
1006         if (!S_ISREG(sb.st_mode)) {
1007                 error("%s is not a regular file", local_path);
1008                 close(local_fd);
1009                 return(-1);
1010         }
1011         stat_to_attrib(&sb, &a);
1012
1013         a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
1014         a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
1015         a.perm &= 0777;
1016         if (!pflag)
1017                 a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
1018
1019         buffer_init(&msg);
1020
1021         /* Send open request */
1022         id = conn->msg_id++;
1023         buffer_put_char(&msg, SSH2_FXP_OPEN);
1024         buffer_put_int(&msg, id);
1025         buffer_put_cstring(&msg, remote_path);
1026         buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC);
1027         encode_attrib(&msg, &a);
1028         send_msg(conn->fd_out, &msg);
1029         debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
1030
1031         buffer_clear(&msg);
1032
1033         handle = get_handle(conn->fd_in, id, &handle_len);
1034         if (handle == NULL) {
1035                 close(local_fd);
1036                 buffer_free(&msg);
1037                 return(-1);
1038         }
1039
1040         startid = ackid = id + 1;
1041         data = xmalloc(conn->transfer_buflen);
1042
1043         /* Read from local and write to remote */
1044         offset = 0;
1045         if (showprogress)
1046                 start_progress_meter(local_path, sb.st_size, &offset);
1047         else
1048                 printf("Uploading %s to %s\n", local_path, remote_path);
1049
1050         for (;;) {
1051                 int len;
1052
1053                 /*
1054                  * Can't use atomicio here because it returns 0 on EOF, thus losing
1055                  * the last block of the file
1056                  */
1057                 do
1058                         len = read(local_fd, data, conn->transfer_buflen);
1059                 while ((len == -1) && (errno == EINTR || errno == EAGAIN));
1060
1061                 if (len == -1)
1062                         fatal("Couldn't read from \"%s\": %s", local_path,
1063                             strerror(errno));
1064
1065                 if (len != 0) {
1066                         ack = xmalloc(sizeof(*ack));
1067                         ack->id = ++id;
1068                         ack->offset = offset;
1069                         ack->len = len;
1070                         TAILQ_INSERT_TAIL(&acks, ack, tq);
1071
1072                         buffer_clear(&msg);
1073                         buffer_put_char(&msg, SSH2_FXP_WRITE);
1074                         buffer_put_int(&msg, ack->id);
1075                         buffer_put_string(&msg, handle, handle_len);
1076                         buffer_put_int64(&msg, offset);
1077                         buffer_put_string(&msg, data, len);
1078                         send_msg(conn->fd_out, &msg);
1079                         debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u",
1080                             id, (unsigned long long)offset, len);
1081                 } else if (TAILQ_FIRST(&acks) == NULL)
1082                         break;
1083
1084                 if (ack == NULL)
1085                         fatal("Unexpected ACK %u", id);
1086
1087                 if (id == startid || len == 0 ||
1088                     id - ackid >= conn->num_requests) {
1089                         u_int r_id;
1090
1091                         buffer_clear(&msg);
1092                         get_msg(conn->fd_in, &msg);
1093                         type = buffer_get_char(&msg);
1094                         r_id = buffer_get_int(&msg);
1095
1096                         if (type != SSH2_FXP_STATUS)
1097                                 fatal("Expected SSH2_FXP_STATUS(%d) packet, "
1098                                     "got %d", SSH2_FXP_STATUS, type);
1099
1100                         status = buffer_get_int(&msg);
1101                         debug3("SSH2_FXP_STATUS %d", status);
1102
1103                         /* Find the request in our queue */
1104                         for(ack = TAILQ_FIRST(&acks);
1105                             ack != NULL && ack->id != r_id;
1106                             ack = TAILQ_NEXT(ack, tq))
1107                                 ;
1108                         if (ack == NULL)
1109                                 fatal("Can't find request for ID %u", r_id);
1110                         TAILQ_REMOVE(&acks, ack, tq);
1111
1112                         if (status != SSH2_FX_OK) {
1113                                 error("Couldn't write to remote file \"%s\": %s",
1114                                     remote_path, fx2txt(status));
1115                                 do_close(conn, handle, handle_len);
1116                                 close(local_fd);
1117                                 xfree(data);
1118                                 xfree(ack);
1119                                 goto done;
1120                         }
1121                         debug3("In write loop, ack for %u %u bytes at %llu",
1122                            ack->id, ack->len, (unsigned long long)ack->offset);
1123                         ++ackid;
1124                         xfree(ack);
1125                 }
1126                 offset += len;
1127         }
1128         if (showprogress)
1129                 stop_progress_meter();
1130         xfree(data);
1131
1132         if (close(local_fd) == -1) {
1133                 error("Couldn't close local file \"%s\": %s", local_path,
1134                     strerror(errno));
1135                 do_close(conn, handle, handle_len);
1136                 status = -1;
1137                 goto done;
1138         }
1139
1140         /* Override umask and utimes if asked */
1141         if (pflag)
1142                 do_fsetstat(conn, handle, handle_len, &a);
1143
1144         status = do_close(conn, handle, handle_len);
1145
1146 done:
1147         xfree(handle);
1148         buffer_free(&msg);
1149         return(status);
1150 }