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 1.23 2002/02/13 00:59:23 djm Exp $");
  32
  33 #if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H)
  34 #include <sys/queue.h>
  35 #else
  36 #include "openbsd-compat/fake-queue.h"
  37 #endif
  38
  39 #include "buffer.h"
  40 #include "bufaux.h"
  41 #include "getput.h"
  42 #include "xmalloc.h"
  43 #include "log.h"
  44 #include "atomicio.h"
  45
  46 #include "sftp.h"
  47 #include "sftp-common.h"
  48 #include "sftp-client.h"
  49
  50 /* Minimum amount of data to read at at time */
  51 #define MIN_READ_SIZE   512
  52
  53 struct sftp_conn {
  54         int fd_in;
  55         int fd_out;
  56         u_int transfer_buflen;
  57         u_int num_requests;
  58         u_int version;
  59         u_int msg_id;
  60 };
  61
  62 static void
  63 send_msg(int fd, Buffer *m)
  64 {
  65         int mlen = buffer_len(m);
  66         int len;
  67         Buffer oqueue;
  68
  69         buffer_init(&oqueue);
  70         buffer_put_int(&oqueue, mlen);
  71         buffer_append(&oqueue, buffer_ptr(m), mlen);
  72         buffer_consume(m, mlen);
  73
  74         len = atomicio(write, fd, buffer_ptr(&oqueue), buffer_len(&oqueue));
  75         if (len <= 0)
  76                 fatal("Couldn't send packet: %s", strerror(errno));
  77
  78         buffer_free(&oqueue);
  79 }
  80
  81 static void
  82 get_msg(int fd, Buffer *m)
  83 {
  84         u_int len, msg_len;
  85         unsigned char buf[4096];
  86
  87         len = atomicio(read, fd, buf, 4);
  88         if (len == 0)
  89                 fatal("Connection closed");
  90         else if (len == -1)
  91                 fatal("Couldn't read packet: %s", strerror(errno));
  92
  93         msg_len = GET_32BIT(buf);
  94         if (msg_len > 256 * 1024)
  95                 fatal("Received message too long %d", msg_len);
  96
  97         while (msg_len) {
  98                 len = atomicio(read, fd, buf, MIN(msg_len, sizeof(buf)));
  99                 if (len == 0)
 100                         fatal("Connection closed");
 101                 else if (len == -1)
 102                         fatal("Couldn't read packet: %s", strerror(errno));
 103
 104                 msg_len -= len;
 105                 buffer_append(m, buf, len);
 106         }
 107 }
 108
 109 static void
 110 send_string_request(int fd, u_int id, u_int code, char *s,
 111     u_int len)
 112 {
 113         Buffer msg;
 114
 115         buffer_init(&msg);
 116         buffer_put_char(&msg, code);
 117         buffer_put_int(&msg, id);
 118         buffer_put_string(&msg, s, len);
 119         send_msg(fd, &msg);
 120         debug3("Sent message fd %d T:%d I:%d", fd, code, id);
 121         buffer_free(&msg);
 122 }
 123
 124 static void
 125 send_string_attrs_request(int fd, u_int id, u_int code, char *s,
 126     u_int len, Attrib *a)
 127 {
 128         Buffer msg;
 129
 130         buffer_init(&msg);
 131         buffer_put_char(&msg, code);
 132         buffer_put_int(&msg, id);
 133         buffer_put_string(&msg, s, len);
 134         encode_attrib(&msg, a);
 135         send_msg(fd, &msg);
 136         debug3("Sent message fd %d T:%d I:%d", fd, code, id);
 137         buffer_free(&msg);
 138 }
 139
 140 static u_int
 141 get_status(int fd, int expected_id)
 142 {
 143         Buffer msg;
 144         u_int type, id, status;
 145
 146         buffer_init(&msg);
 147         get_msg(fd, &msg);
 148         type = buffer_get_char(&msg);
 149         id = buffer_get_int(&msg);
 150
 151         if (id != expected_id)
 152                 fatal("ID mismatch (%d != %d)", id, expected_id);
 153         if (type != SSH2_FXP_STATUS)
 154                 fatal("Expected SSH2_FXP_STATUS(%d) packet, got %d",
 155                     SSH2_FXP_STATUS, type);
 156
 157         status = buffer_get_int(&msg);
 158         buffer_free(&msg);
 159
 160         debug3("SSH2_FXP_STATUS %d", status);
 161
 162         return(status);
 163 }
 164
 165 static char *
 166 get_handle(int fd, u_int expected_id, u_int *len)
 167 {
 168         Buffer msg;
 169         u_int type, id;
 170         char *handle;
 171
 172         buffer_init(&msg);
 173         get_msg(fd, &msg);
 174         type = buffer_get_char(&msg);
 175         id = buffer_get_int(&msg);
 176
 177         if (id != expected_id)
 178                 fatal("ID mismatch (%d != %d)", id, expected_id);
 179         if (type == SSH2_FXP_STATUS) {
 180                 int status = buffer_get_int(&msg);
 181
 182                 error("Couldn't get handle: %s", fx2txt(status));
 183                 return(NULL);
 184         } else if (type != SSH2_FXP_HANDLE)
 185                 fatal("Expected SSH2_FXP_HANDLE(%d) packet, got %d",
 186                     SSH2_FXP_HANDLE, type);
 187
 188         handle = buffer_get_string(&msg, len);
 189         buffer_free(&msg);
 190
 191         return(handle);
 192 }
 193
 194 static Attrib *
 195 get_decode_stat(int fd, u_int expected_id, int quiet)
 196 {
 197         Buffer msg;
 198         u_int type, id;
 199         Attrib *a;
 200
 201         buffer_init(&msg);
 202         get_msg(fd, &msg);
 203
 204         type = buffer_get_char(&msg);
 205         id = buffer_get_int(&msg);
 206
 207         debug3("Received stat reply T:%d I:%d", type, id);
 208         if (id != expected_id)
 209                 fatal("ID mismatch (%d != %d)", id, expected_id);
 210         if (type == SSH2_FXP_STATUS) {
 211                 int status = buffer_get_int(&msg);
 212
 213                 if (quiet)
 214                         debug("Couldn't stat remote file: %s", fx2txt(status));
 215                 else
 216                         error("Couldn't stat remote file: %s", fx2txt(status));
 217                 return(NULL);
 218         } else if (type != SSH2_FXP_ATTRS) {
 219                 fatal("Expected SSH2_FXP_ATTRS(%d) packet, got %d",
 220                     SSH2_FXP_ATTRS, type);
 221         }
 222         a = decode_attrib(&msg);
 223         buffer_free(&msg);
 224
 225         return(a);
 226 }
 227
 228 struct sftp_conn *
 229 do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests)
 230 {
 231         int type, 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 %d)",
 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 = MAX(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:%d", 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:%d", 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:%d I:%d", type, id);
 362
 363                 if (id != expected_id)
 364                         fatal("ID mismatch (%d != %d)", 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                                 return(status);
 378                         }
 379                 } else if (type != SSH2_FXP_NAME)
 380                         fatal("Expected SSH2_FXP_NAME(%d) packet, got %d",
 381                             SSH2_FXP_NAME, type);
 382
 383                 count = buffer_get_int(&msg);
 384                 if (count == 0)
 385                         break;
 386                 debug3("Received %d SSH2_FXP_NAME responses", count);
 387                 for (i = 0; i < count; i++) {
 388                         char *filename, *longname;
 389                         Attrib *a;
 390
 391                         filename = buffer_get_string(&msg, NULL);
 392                         longname = buffer_get_string(&msg, NULL);
 393                         a = decode_attrib(&msg);
 394
 395                         if (printflag)
 396                                 printf("%s\n", longname);
 397
 398                         if (dir) {
 399                                 *dir = xrealloc(*dir, sizeof(**dir) *
 400                                     (ents + 2));
 401                                 (*dir)[ents] = xmalloc(sizeof(***dir));
 402                                 (*dir)[ents]->filename = xstrdup(filename);
 403                                 (*dir)[ents]->longname = xstrdup(longname);
 404                                 memcpy(&(*dir)[ents]->a, a, sizeof(*a));
 405                                 (*dir)[++ents] = NULL;
 406                         }
 407
 408                         xfree(filename);
 409                         xfree(longname);
 410                 }
 411         }
 412
 413         buffer_free(&msg);
 414         do_close(conn, handle, handle_len);
 415         xfree(handle);
 416
 417         return(0);
 418 }
 419
 420 int
 421 do_ls(struct sftp_conn *conn, char *path)
 422 {
 423         return(do_lsreaddir(conn, path, 1, NULL));
 424 }
 425
 426 int
 427 do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir)
 428 {
 429         return(do_lsreaddir(conn, path, 0, dir));
 430 }
 431
 432 void free_sftp_dirents(SFTP_DIRENT **s)
 433 {
 434         int i;
 435
 436         for (i = 0; s[i]; i++) {
 437                 xfree(s[i]->filename);
 438                 xfree(s[i]->longname);
 439                 xfree(s[i]);
 440         }
 441         xfree(s);
 442 }
 443
 444 int
 445 do_rm(struct sftp_conn *conn, char *path)
 446 {
 447         u_int status, id;
 448
 449         debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
 450
 451         id = conn->msg_id++;
 452         send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path,
 453             strlen(path));
 454         status = get_status(conn->fd_in, id);
 455         if (status != SSH2_FX_OK)
 456                 error("Couldn't delete file: %s", fx2txt(status));
 457         return(status);
 458 }
 459
 460 int
 461 do_mkdir(struct sftp_conn *conn, char *path, Attrib *a)
 462 {
 463         u_int status, id;
 464
 465         id = conn->msg_id++;
 466         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path,
 467             strlen(path), a);
 468
 469         status = get_status(conn->fd_in, id);
 470         if (status != SSH2_FX_OK)
 471                 error("Couldn't create directory: %s", fx2txt(status));
 472
 473         return(status);
 474 }
 475
 476 int
 477 do_rmdir(struct sftp_conn *conn, char *path)
 478 {
 479         u_int status, id;
 480
 481         id = conn->msg_id++;
 482         send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path,
 483             strlen(path));
 484
 485         status = get_status(conn->fd_in, id);
 486         if (status != SSH2_FX_OK)
 487                 error("Couldn't remove directory: %s", fx2txt(status));
 488
 489         return(status);
 490 }
 491
 492 Attrib *
 493 do_stat(struct sftp_conn *conn, char *path, int quiet)
 494 {
 495         u_int id;
 496
 497         id = conn->msg_id++;
 498
 499         send_string_request(conn->fd_out, id,
 500             conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT,
 501             path, strlen(path));
 502
 503         return(get_decode_stat(conn->fd_in, id, quiet));
 504 }
 505
 506 Attrib *
 507 do_lstat(struct sftp_conn *conn, char *path, int quiet)
 508 {
 509         u_int id;
 510
 511         if (conn->version == 0) {
 512                 if (quiet)
 513                         debug("Server version does not support lstat operation");
 514                 else
 515                         error("Server version does not support lstat operation");
 516                 return(NULL);
 517         }
 518
 519         id = conn->msg_id++;
 520         send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path,
 521             strlen(path));
 522
 523         return(get_decode_stat(conn->fd_in, id, quiet));
 524 }
 525
 526 Attrib *
 527 do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet)
 528 {
 529         u_int id;
 530
 531         id = conn->msg_id++;
 532         send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle,
 533             handle_len);
 534
 535         return(get_decode_stat(conn->fd_in, id, quiet));
 536 }
 537
 538 int
 539 do_setstat(struct sftp_conn *conn, char *path, Attrib *a)
 540 {
 541         u_int status, id;
 542
 543         id = conn->msg_id++;
 544         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path,
 545             strlen(path), a);
 546
 547         status = get_status(conn->fd_in, id);
 548         if (status != SSH2_FX_OK)
 549                 error("Couldn't setstat on \"%s\": %s", path,
 550                     fx2txt(status));
 551
 552         return(status);
 553 }
 554
 555 int
 556 do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len,
 557     Attrib *a)
 558 {
 559         u_int status, id;
 560
 561         id = conn->msg_id++;
 562         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle,
 563             handle_len, a);
 564
 565         status = get_status(conn->fd_in, id);
 566         if (status != SSH2_FX_OK)
 567                 error("Couldn't fsetstat: %s", fx2txt(status));
 568
 569         return(status);
 570 }
 571
 572 char *
 573 do_realpath(struct sftp_conn *conn, char *path)
 574 {
 575         Buffer msg;
 576         u_int type, expected_id, count, id;
 577         char *filename, *longname;
 578         Attrib *a;
 579
 580         expected_id = id = conn->msg_id++;
 581         send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path,
 582             strlen(path));
 583
 584         buffer_init(&msg);
 585
 586         get_msg(conn->fd_in, &msg);
 587         type = buffer_get_char(&msg);
 588         id = buffer_get_int(&msg);
 589
 590         if (id != expected_id)
 591                 fatal("ID mismatch (%d != %d)", id, expected_id);
 592
 593         if (type == SSH2_FXP_STATUS) {
 594                 u_int status = buffer_get_int(&msg);
 595
 596                 error("Couldn't canonicalise: %s", fx2txt(status));
 597                 return(NULL);
 598         } else if (type != SSH2_FXP_NAME)
 599                 fatal("Expected SSH2_FXP_NAME(%d) packet, got %d",
 600                     SSH2_FXP_NAME, type);
 601
 602         count = buffer_get_int(&msg);
 603         if (count != 1)
 604                 fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count);
 605
 606         filename = buffer_get_string(&msg, NULL);
 607         longname = buffer_get_string(&msg, NULL);
 608         a = decode_attrib(&msg);
 609
 610         debug3("SSH_FXP_REALPATH %s -> %s", path, filename);
 611
 612         xfree(longname);
 613
 614         buffer_free(&msg);
 615
 616         return(filename);
 617 }
 618
 619 int
 620 do_rename(struct sftp_conn *conn, char *oldpath, char *newpath)
 621 {
 622         Buffer msg;
 623         u_int status, id;
 624
 625         buffer_init(&msg);
 626
 627         /* Send rename request */
 628         id = conn->msg_id++;
 629         buffer_put_char(&msg, SSH2_FXP_RENAME);
 630         buffer_put_int(&msg, id);
 631         buffer_put_cstring(&msg, oldpath);
 632         buffer_put_cstring(&msg, newpath);
 633         send_msg(conn->fd_out, &msg);
 634         debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath,
 635             newpath);
 636         buffer_free(&msg);
 637
 638         status = get_status(conn->fd_in, id);
 639         if (status != SSH2_FX_OK)
 640                 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
 641                     newpath, fx2txt(status));
 642
 643         return(status);
 644 }
 645
 646 int
 647 do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath)
 648 {
 649         Buffer msg;
 650         u_int status, id;
 651
 652         if (conn->version < 3) {
 653                 error("This server does not support the symlink operation");
 654                 return(SSH2_FX_OP_UNSUPPORTED);
 655         }
 656
 657         buffer_init(&msg);
 658
 659         /* Send rename request */
 660         id = conn->msg_id++;
 661         buffer_put_char(&msg, SSH2_FXP_SYMLINK);
 662         buffer_put_int(&msg, id);
 663         buffer_put_cstring(&msg, oldpath);
 664         buffer_put_cstring(&msg, newpath);
 665         send_msg(conn->fd_out, &msg);
 666         debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath,
 667             newpath);
 668         buffer_free(&msg);
 669
 670         status = get_status(conn->fd_in, id);
 671         if (status != SSH2_FX_OK)
 672                 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
 673                     newpath, fx2txt(status));
 674
 675         return(status);
 676 }
 677
 678 char *
 679 do_readlink(struct sftp_conn *conn, char *path)
 680 {
 681         Buffer msg;
 682         u_int type, expected_id, count, id;
 683         char *filename, *longname;
 684         Attrib *a;
 685
 686         expected_id = id = conn->msg_id++;
 687         send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path,
 688             strlen(path));
 689
 690         buffer_init(&msg);
 691
 692         get_msg(conn->fd_in, &msg);
 693         type = buffer_get_char(&msg);
 694         id = buffer_get_int(&msg);
 695
 696         if (id != expected_id)
 697                 fatal("ID mismatch (%d != %d)", id, expected_id);
 698
 699         if (type == SSH2_FXP_STATUS) {
 700                 u_int status = buffer_get_int(&msg);
 701
 702                 error("Couldn't readlink: %s", fx2txt(status));
 703                 return(NULL);
 704         } else if (type != SSH2_FXP_NAME)
 705                 fatal("Expected SSH2_FXP_NAME(%d) packet, got %d",
 706                     SSH2_FXP_NAME, type);
 707
 708         count = buffer_get_int(&msg);
 709         if (count != 1)
 710                 fatal("Got multiple names (%d) from SSH_FXP_READLINK", count);
 711
 712         filename = buffer_get_string(&msg, NULL);
 713         longname = buffer_get_string(&msg, NULL);
 714         a = decode_attrib(&msg);
 715
 716         debug3("SSH_FXP_READLINK %s -> %s", path, filename);
 717
 718         xfree(longname);
 719
 720         buffer_free(&msg);
 721
 722         return(filename);
 723 }
 724
 725 static void
 726 send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len,
 727     char *handle, u_int handle_len)
 728 {
 729         Buffer msg;
 730
 731         buffer_init(&msg);
 732         buffer_clear(&msg);
 733         buffer_put_char(&msg, SSH2_FXP_READ);
 734         buffer_put_int(&msg, id);
 735         buffer_put_string(&msg, handle, handle_len);
 736         buffer_put_int64(&msg, offset);
 737         buffer_put_int(&msg, len);
 738         send_msg(fd_out, &msg);
 739         buffer_free(&msg);
 740 }
 741
 742 int
 743 do_download(struct sftp_conn *conn, char *remote_path, char *local_path,
 744     int pflag)
 745 {
 746         Attrib junk, *a;
 747         Buffer msg;
 748         char *handle;
 749         int local_fd, status, num_req, max_req, write_error;
 750         int read_error, write_errno;
 751         u_int64_t offset, size;
 752         u_int handle_len, mode, type, id, buflen;
 753         struct request {
 754                 u_int id;
 755                 u_int len;
 756                 u_int64_t offset;
 757                 TAILQ_ENTRY(request) tq;
 758         };
 759         TAILQ_HEAD(reqhead, request) requests;
 760         struct request *req;
 761
 762         TAILQ_INIT(&requests);
 763
 764         a = do_stat(conn, remote_path, 0);
 765         if (a == NULL)
 766                 return(-1);
 767
 768         /* XXX: should we preserve set[ug]id? */
 769         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 770                 mode = S_IWRITE | (a->perm & 0777);
 771         else
 772                 mode = 0666;
 773
 774         if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
 775             (a->perm & S_IFDIR)) {
 776                 error("Cannot download a directory: %s", remote_path);
 777                 return(-1);
 778         }
 779
 780         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
 781                 size = a->size;
 782         else
 783                 size = 0;
 784
 785         buflen = conn->transfer_buflen;
 786         buffer_init(&msg);
 787
 788         /* Send open request */
 789         id = conn->msg_id++;
 790         buffer_put_char(&msg, SSH2_FXP_OPEN);
 791         buffer_put_int(&msg, id);
 792         buffer_put_cstring(&msg, remote_path);
 793         buffer_put_int(&msg, SSH2_FXF_READ);
 794         attrib_clear(&junk); /* Send empty attributes */
 795         encode_attrib(&msg, &junk);
 796         send_msg(conn->fd_out, &msg);
 797         debug3("Sent message SSH2_FXP_OPEN I:%d P:%s", id, remote_path);
 798
 799         handle = get_handle(conn->fd_in, id, &handle_len);
 800         if (handle == NULL) {
 801                 buffer_free(&msg);
 802                 close(local_fd);
 803                 return(-1);
 804         }
 805
 806         local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, mode);
 807         if (local_fd == -1) {
 808                 error("Couldn't open local file \"%s\" for writing: %s",
 809                     local_path, strerror(errno));
 810                 return(-1);
 811         }
 812
 813         /* Read from remote and write to local */
 814         write_error = read_error = write_errno = num_req = offset = 0;
 815         max_req = 1;
 816         while (num_req > 0 || max_req > 0) {
 817                 char *data;
 818                 u_int len;
 819
 820                 /* Send some more requests */
 821                 while (num_req < max_req) {
 822                         debug3("Request range %llu -> %llu (%d/%d)",
 823                             offset, offset + buflen - 1, 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:%d I:%d 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", req->offset,
 862                             req->offset + len - 1);
 863                         if (len > req->len)
 864                                 fatal("Received more data than asked for "
 865                                       "%d > %d", len, req->len);
 866                         if ((lseek(local_fd, req->offset, SEEK_SET) == -1 ||
 867                              atomicio(write, local_fd, data, len) != len) &&
 868                             !write_error) {
 869                                 write_errno = errno;
 870                                 write_error = 1;
 871                                 max_req = 0;
 872                         }
 873                         xfree(data);
 874
 875                         if (len == req->len) {
 876                                 TAILQ_REMOVE(&requests, req, tq);
 877                                 xfree(req);
 878                                 num_req--;
 879                         } else {
 880                                 /* Resend the request for the missing data */
 881                                 debug3("Short data block, re-requesting "
 882                                     "%llu -> %llu (%2d)", req->offset + len,
 883                                         req->offset + req->len - 1, num_req);
 884                                 req->id = conn->msg_id++;
 885                                 req->len -= len;
 886                                 req->offset += len;
 887                                 send_read_request(conn->fd_out, req->id,
 888                                     req->offset, req->len, handle, handle_len);
 889                                 /* Reduce the request size */
 890                                 if (len < buflen)
 891                                         buflen = MAX(MIN_READ_SIZE, len);
 892                         }
 893                         if (max_req > 0) { /* max_req = 0 iff EOF received */
 894                                 if (size > 0 && offset > size) {
 895                                         /* Only one request at a time
 896                                          * after the expected EOF */
 897                                         debug3("Finish at %llu (%2d)",
 898                                             offset, num_req);
 899                                         max_req = 1;
 900                                 }
 901                                 else if (max_req < conn->num_requests + 1) {
 902                                         ++max_req;
 903                                 }
 904                         }
 905                         break;
 906                 default:
 907                         fatal("Expected SSH2_FXP_DATA(%d) packet, got %d",
 908                             SSH2_FXP_DATA, type);
 909                 }
 910         }
 911
 912         /* Sanity check */
 913         if (TAILQ_FIRST(&requests) != NULL)
 914                 fatal("Transfer complete, but requests still in queue");
 915
 916         if (read_error) {
 917                 error("Couldn't read from remote file \"%s\" : %s",
 918                     remote_path, fx2txt(status));
 919                 do_close(conn, handle, handle_len);
 920         } else if (write_error) {
 921                 error("Couldn't write to \"%s\": %s", local_path,
 922                     strerror(write_errno));
 923                 status = -1;
 924                 do_close(conn, handle, handle_len);
 925         } else {
 926                 status = do_close(conn, handle, handle_len);
 927
 928                 /* Override umask and utimes if asked */
 929 #ifdef HAVE_FCHMOD
 930                 if (pflag && fchmod(local_fd, mode) == -1)
 931 #else
 932                 if (pflag && chmod(local_path, mode) == -1)
 933 #endif /* HAVE_FCHMOD */
 934                         error("Couldn't set mode on \"%s\": %s", local_path,
 935                               strerror(errno));
 936                 if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) {
 937                         struct timeval tv[2];
 938                         tv[0].tv_sec = a->atime;
 939                         tv[1].tv_sec = a->mtime;
 940                         tv[0].tv_usec = tv[1].tv_usec = 0;
 941                         if (utimes(local_path, tv) == -1)
 942                                 error("Can't set times on \"%s\": %s",
 943                                       local_path, strerror(errno));
 944                 }
 945         }
 946         close(local_fd);
 947         buffer_free(&msg);
 948         xfree(handle);
 949
 950         return(status);
 951 }
 952
 953 int
 954 do_upload(struct sftp_conn *conn, char *local_path, char *remote_path,
 955     int pflag)
 956 {
 957         int local_fd, status;
 958         u_int handle_len, id, type;
 959         u_int64_t offset;
 960         char *handle, *data;
 961         Buffer msg;
 962         struct stat sb;
 963         Attrib a;
 964         u_int32_t startid;
 965         u_int32_t ackid;
 966         struct outstanding_ack {
 967                 u_int id;
 968                 u_int len;
 969                 u_int64_t offset;
 970                 TAILQ_ENTRY(outstanding_ack) tq;
 971         };
 972         TAILQ_HEAD(ackhead, outstanding_ack) acks;
 973         struct outstanding_ack *ack;
 974
 975         TAILQ_INIT(&acks);
 976
 977         if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) {
 978                 error("Couldn't open local file \"%s\" for reading: %s",
 979                     local_path, strerror(errno));
 980                 return(-1);
 981         }
 982         if (fstat(local_fd, &sb) == -1) {
 983                 error("Couldn't fstat local file \"%s\": %s",
 984                     local_path, strerror(errno));
 985                 close(local_fd);
 986                 return(-1);
 987         }
 988         stat_to_attrib(&sb, &a);
 989
 990         a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
 991         a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
 992         a.perm &= 0777;
 993         if (!pflag)
 994                 a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
 995
 996         buffer_init(&msg);
 997
 998         /* Send open request */
 999         id = conn->msg_id++;
1000         buffer_put_char(&msg, SSH2_FXP_OPEN);
1001         buffer_put_int(&msg, id);
1002         buffer_put_cstring(&msg, remote_path);
1003         buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC);
1004         encode_attrib(&msg, &a);
1005         send_msg(conn->fd_out, &msg);
1006         debug3("Sent message SSH2_FXP_OPEN I:%d P:%s", id, remote_path);
1007
1008         buffer_clear(&msg);
1009
1010         handle = get_handle(conn->fd_in, id, &handle_len);
1011         if (handle == NULL) {
1012                 close(local_fd);
1013                 buffer_free(&msg);
1014                 return(-1);
1015         }
1016
1017         startid = ackid = id + 1;
1018         data = xmalloc(conn->transfer_buflen);
1019
1020         /* Read from local and write to remote */
1021         offset = 0;
1022         for (;;) {
1023                 int len;
1024
1025                 /*
1026                  * Can't use atomicio here because it returns 0 on EOF, thus losing
1027                  * the last block of the file
1028                  */
1029                 do
1030                         len = read(local_fd, data, conn->transfer_buflen);
1031                 while ((len == -1) && (errno == EINTR || errno == EAGAIN));
1032
1033                 if (len == -1)
1034                         fatal("Couldn't read from \"%s\": %s", local_path,
1035                             strerror(errno));
1036
1037                 if (len != 0) {
1038                         ack = xmalloc(sizeof(*ack));
1039                         ack->id = ++id;
1040                         ack->offset = offset;
1041                         ack->len = len;
1042                         TAILQ_INSERT_TAIL(&acks, ack, tq);
1043
1044                         buffer_clear(&msg);
1045                         buffer_put_char(&msg, SSH2_FXP_WRITE);
1046                         buffer_put_int(&msg, ack->id);
1047                         buffer_put_string(&msg, handle, handle_len);
1048                         buffer_put_int64(&msg, offset);
1049                         buffer_put_string(&msg, data, len);
1050                         send_msg(conn->fd_out, &msg);
1051                         debug3("Sent message SSH2_FXP_WRITE I:%d O:%llu S:%u",
1052                                id, (u_int64_t)offset, len);
1053                 } else if (TAILQ_FIRST(&acks) == NULL)
1054                         break;
1055
1056                 if (ack == NULL)
1057                         fatal("Unexpected ACK %u", id);
1058
1059                 if (id == startid || len == 0 ||
1060                     id - ackid >= conn->num_requests) {
1061                         buffer_clear(&msg);
1062                         get_msg(conn->fd_in, &msg);
1063                         type = buffer_get_char(&msg);
1064                         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 != id;
1076                             ack = TAILQ_NEXT(ack, tq))
1077                                 ;
1078                         if (ack == NULL)
1079                                 fatal("Can't find request for ID %d", 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 %d bytes at %llu",
1090                            ack->id, ack->len, ack->offset);
1091                         ++ackid;
1092                         free(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 }