sftp-client.c

   1 /* $OpenBSD: sftp-client.c,v 1.63 2006/03/25 13:17:02 djm Exp $ */
   2 /*
   3  * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* XXX: memleaks */
  19 /* XXX: signed vs unsigned */
  20 /* XXX: remove all logging, only return status codes */
  21 /* XXX: copy between two remote sites */
  22
  23 #include "includes.h"
  24
  25 #include <sys/types.h>
  26 #ifdef HAVE_SYS_STAT_H
  27 # include <sys/stat.h>
  28 #endif
  29 # include <signal.h>
  30
  31 #include "openbsd-compat/sys-queue.h"
  32
  33 #include "buffer.h"
  34 #include "bufaux.h"
  35 #include "getput.h"
  36 #include "xmalloc.h"
  37 #include "log.h"
  38 #include "atomicio.h"
  39 #include "progressmeter.h"
  40
  41 #include "sftp.h"
  42 #include "sftp-common.h"
  43 #include "sftp-client.h"
  44
  45 extern volatile sig_atomic_t interrupted;
  46 extern int showprogress;
  47
  48 /* Minimum amount of data to read at a time */
  49 #define MIN_READ_SIZE   512
  50
  51 struct sftp_conn {
  52         int fd_in;
  53         int fd_out;
  54         u_int transfer_buflen;
  55         u_int num_requests;
  56         u_int version;
  57         u_int msg_id;
  58 };
  59
  60 static void
  61 send_msg(int fd, Buffer *m)
  62 {
  63         u_char mlen[4];
  64
  65         if (buffer_len(m) > SFTP_MAX_MSG_LENGTH)
  66                 fatal("Outbound message too long %u", buffer_len(m));
  67
  68         /* Send length first */
  69         PUT_32BIT(mlen, buffer_len(m));
  70         if (atomicio(vwrite, fd, mlen, sizeof(mlen)) != sizeof(mlen))
  71                 fatal("Couldn't send packet: %s", strerror(errno));
  72
  73         if (atomicio(vwrite, fd, buffer_ptr(m), buffer_len(m)) != buffer_len(m))
  74                 fatal("Couldn't send packet: %s", strerror(errno));
  75
  76         buffer_clear(m);
  77 }
  78
  79 static void
  80 get_msg(int fd, Buffer *m)
  81 {
  82         u_int msg_len;
  83
  84         buffer_append_space(m, 4);
  85         if (atomicio(read, fd, buffer_ptr(m), 4) != 4) {
  86                 if (errno == EPIPE)
  87                         fatal("Connection closed");
  88                 else
  89                         fatal("Couldn't read packet: %s", strerror(errno));
  90         }
  91
  92         msg_len = buffer_get_int(m);
  93         if (msg_len > SFTP_MAX_MSG_LENGTH)
  94                 fatal("Received message too long %u", msg_len);
  95
  96         buffer_append_space(m, msg_len);
  97         if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
  98                 if (errno == EPIPE)
  99                         fatal("Connection closed");
 100                 else
 101                         fatal("Read packet: %s", strerror(errno));
 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                 buffer_free(&msg);
 180                 return(NULL);
 181         } else if (type != SSH2_FXP_HANDLE)
 182                 fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u",
 183                     SSH2_FXP_HANDLE, type);
 184
 185         handle = buffer_get_string(&msg, len);
 186         buffer_free(&msg);
 187
 188         return(handle);
 189 }
 190
 191 static Attrib *
 192 get_decode_stat(int fd, u_int expected_id, int quiet)
 193 {
 194         Buffer msg;
 195         u_int type, id;
 196         Attrib *a;
 197
 198         buffer_init(&msg);
 199         get_msg(fd, &msg);
 200
 201         type = buffer_get_char(&msg);
 202         id = buffer_get_int(&msg);
 203
 204         debug3("Received stat reply T:%u I:%u", type, id);
 205         if (id != expected_id)
 206                 fatal("ID mismatch (%u != %u)", id, expected_id);
 207         if (type == SSH2_FXP_STATUS) {
 208                 int status = buffer_get_int(&msg);
 209
 210                 if (quiet)
 211                         debug("Couldn't stat remote file: %s", fx2txt(status));
 212                 else
 213                         error("Couldn't stat remote file: %s", fx2txt(status));
 214                 buffer_free(&msg);
 215                 return(NULL);
 216         } else if (type != SSH2_FXP_ATTRS) {
 217                 fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u",
 218                     SSH2_FXP_ATTRS, type);
 219         }
 220         a = decode_attrib(&msg);
 221         buffer_free(&msg);
 222
 223         return(a);
 224 }
 225
 226 struct sftp_conn *
 227 do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests)
 228 {
 229         u_int type;
 230         int version;
 231         Buffer msg;
 232         struct sftp_conn *ret;
 233
 234         buffer_init(&msg);
 235         buffer_put_char(&msg, SSH2_FXP_INIT);
 236         buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
 237         send_msg(fd_out, &msg);
 238
 239         buffer_clear(&msg);
 240
 241         get_msg(fd_in, &msg);
 242
 243         /* Expecting a VERSION reply */
 244         if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) {
 245                 error("Invalid packet back from SSH2_FXP_INIT (type %u)",
 246                     type);
 247                 buffer_free(&msg);
 248                 return(NULL);
 249         }
 250         version = buffer_get_int(&msg);
 251
 252         debug2("Remote version: %d", version);
 253
 254         /* Check for extensions */
 255         while (buffer_len(&msg) > 0) {
 256                 char *name = buffer_get_string(&msg, NULL);
 257                 char *value = buffer_get_string(&msg, NULL);
 258
 259                 debug2("Init extension: \"%s\"", name);
 260                 xfree(name);
 261                 xfree(value);
 262         }
 263
 264         buffer_free(&msg);
 265
 266         ret = xmalloc(sizeof(*ret));
 267         ret->fd_in = fd_in;
 268         ret->fd_out = fd_out;
 269         ret->transfer_buflen = transfer_buflen;
 270         ret->num_requests = num_requests;
 271         ret->version = version;
 272         ret->msg_id = 1;
 273
 274         /* Some filexfer v.0 servers don't support large packets */
 275         if (version == 0)
 276                 ret->transfer_buflen = MIN(ret->transfer_buflen, 20480);
 277
 278         return(ret);
 279 }
 280
 281 u_int
 282 sftp_proto_version(struct sftp_conn *conn)
 283 {
 284         return(conn->version);
 285 }
 286
 287 int
 288 do_close(struct sftp_conn *conn, char *handle, u_int handle_len)
 289 {
 290         u_int id, status;
 291         Buffer msg;
 292
 293         buffer_init(&msg);
 294
 295         id = conn->msg_id++;
 296         buffer_put_char(&msg, SSH2_FXP_CLOSE);
 297         buffer_put_int(&msg, id);
 298         buffer_put_string(&msg, handle, handle_len);
 299         send_msg(conn->fd_out, &msg);
 300         debug3("Sent message SSH2_FXP_CLOSE I:%u", id);
 301
 302         status = get_status(conn->fd_in, id);
 303         if (status != SSH2_FX_OK)
 304                 error("Couldn't close file: %s", fx2txt(status));
 305
 306         buffer_free(&msg);
 307
 308         return(status);
 309 }
 310
 311
 312 static int
 313 do_lsreaddir(struct sftp_conn *conn, char *path, int printflag,
 314     SFTP_DIRENT ***dir)
 315 {
 316         Buffer msg;
 317         u_int count, type, id, handle_len, i, expected_id, ents = 0;
 318         char *handle;
 319
 320         id = conn->msg_id++;
 321
 322         buffer_init(&msg);
 323         buffer_put_char(&msg, SSH2_FXP_OPENDIR);
 324         buffer_put_int(&msg, id);
 325         buffer_put_cstring(&msg, path);
 326         send_msg(conn->fd_out, &msg);
 327
 328         buffer_clear(&msg);
 329
 330         handle = get_handle(conn->fd_in, id, &handle_len);
 331         if (handle == NULL)
 332                 return(-1);
 333
 334         if (dir) {
 335                 ents = 0;
 336                 *dir = xmalloc(sizeof(**dir));
 337                 (*dir)[0] = NULL;
 338         }
 339
 340         for (; !interrupted;) {
 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                                 xfree(handle);
 375                                 return(status);
 376                         }
 377                 } else if (type != SSH2_FXP_NAME)
 378                         fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 379                             SSH2_FXP_NAME, type);
 380
 381                 count = buffer_get_int(&msg);
 382                 if (count == 0)
 383                         break;
 384                 debug3("Received %d SSH2_FXP_NAME responses", count);
 385                 for (i = 0; i < count; i++) {
 386                         char *filename, *longname;
 387                         Attrib *a;
 388
 389                         filename = buffer_get_string(&msg, NULL);
 390                         longname = buffer_get_string(&msg, NULL);
 391                         a = decode_attrib(&msg);
 392
 393                         if (printflag)
 394                                 printf("%s\n", longname);
 395
 396                         if (dir) {
 397                                 *dir = xrealloc(*dir, ents + 2, sizeof(**dir));
 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         /* Don't return partial matches on interrupt */
 415         if (interrupted && dir != NULL && *dir != NULL) {
 416                 free_sftp_dirents(*dir);
 417                 *dir = xmalloc(sizeof(**dir));
 418                 **dir = NULL;
 419         }
 420
 421         return(0);
 422 }
 423
 424 int
 425 do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir)
 426 {
 427         return(do_lsreaddir(conn, path, 0, dir));
 428 }
 429
 430 void free_sftp_dirents(SFTP_DIRENT **s)
 431 {
 432         int i;
 433
 434         for (i = 0; s[i]; i++) {
 435                 xfree(s[i]->filename);
 436                 xfree(s[i]->longname);
 437                 xfree(s[i]);
 438         }
 439         xfree(s);
 440 }
 441
 442 int
 443 do_rm(struct sftp_conn *conn, char *path)
 444 {
 445         u_int status, id;
 446
 447         debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
 448
 449         id = conn->msg_id++;
 450         send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path,
 451             strlen(path));
 452         status = get_status(conn->fd_in, id);
 453         if (status != SSH2_FX_OK)
 454                 error("Couldn't delete file: %s", fx2txt(status));
 455         return(status);
 456 }
 457
 458 int
 459 do_mkdir(struct sftp_conn *conn, char *path, Attrib *a)
 460 {
 461         u_int status, id;
 462
 463         id = conn->msg_id++;
 464         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path,
 465             strlen(path), a);
 466
 467         status = get_status(conn->fd_in, id);
 468         if (status != SSH2_FX_OK)
 469                 error("Couldn't create directory: %s", fx2txt(status));
 470
 471         return(status);
 472 }
 473
 474 int
 475 do_rmdir(struct sftp_conn *conn, char *path)
 476 {
 477         u_int status, id;
 478
 479         id = conn->msg_id++;
 480         send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path,
 481             strlen(path));
 482
 483         status = get_status(conn->fd_in, id);
 484         if (status != SSH2_FX_OK)
 485                 error("Couldn't remove directory: %s", fx2txt(status));
 486
 487         return(status);
 488 }
 489
 490 Attrib *
 491 do_stat(struct sftp_conn *conn, char *path, int quiet)
 492 {
 493         u_int id;
 494
 495         id = conn->msg_id++;
 496
 497         send_string_request(conn->fd_out, id,
 498             conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT,
 499             path, strlen(path));
 500
 501         return(get_decode_stat(conn->fd_in, id, quiet));
 502 }
 503
 504 Attrib *
 505 do_lstat(struct sftp_conn *conn, char *path, int quiet)
 506 {
 507         u_int id;
 508
 509         if (conn->version == 0) {
 510                 if (quiet)
 511                         debug("Server version does not support lstat operation");
 512                 else
 513                         logit("Server version does not support lstat operation");
 514                 return(do_stat(conn, path, quiet));
 515         }
 516
 517         id = conn->msg_id++;
 518         send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path,
 519             strlen(path));
 520
 521         return(get_decode_stat(conn->fd_in, id, quiet));
 522 }
 523
 524 Attrib *
 525 do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet)
 526 {
 527         u_int id;
 528
 529         id = conn->msg_id++;
 530         send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle,
 531             handle_len);
 532
 533         return(get_decode_stat(conn->fd_in, id, quiet));
 534 }
 535
 536 int
 537 do_setstat(struct sftp_conn *conn, char *path, Attrib *a)
 538 {
 539         u_int status, id;
 540
 541         id = conn->msg_id++;
 542         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path,
 543             strlen(path), a);
 544
 545         status = get_status(conn->fd_in, id);
 546         if (status != SSH2_FX_OK)
 547                 error("Couldn't setstat on \"%s\": %s", path,
 548                     fx2txt(status));
 549
 550         return(status);
 551 }
 552
 553 int
 554 do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len,
 555     Attrib *a)
 556 {
 557         u_int status, id;
 558
 559         id = conn->msg_id++;
 560         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle,
 561             handle_len, a);
 562
 563         status = get_status(conn->fd_in, id);
 564         if (status != SSH2_FX_OK)
 565                 error("Couldn't fsetstat: %s", fx2txt(status));
 566
 567         return(status);
 568 }
 569
 570 char *
 571 do_realpath(struct sftp_conn *conn, char *path)
 572 {
 573         Buffer msg;
 574         u_int type, expected_id, count, id;
 575         char *filename, *longname;
 576         Attrib *a;
 577
 578         expected_id = id = conn->msg_id++;
 579         send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path,
 580             strlen(path));
 581
 582         buffer_init(&msg);
 583
 584         get_msg(conn->fd_in, &msg);
 585         type = buffer_get_char(&msg);
 586         id = buffer_get_int(&msg);
 587
 588         if (id != expected_id)
 589                 fatal("ID mismatch (%u != %u)", id, expected_id);
 590
 591         if (type == SSH2_FXP_STATUS) {
 592                 u_int status = buffer_get_int(&msg);
 593
 594                 error("Couldn't canonicalise: %s", fx2txt(status));
 595                 return(NULL);
 596         } else if (type != SSH2_FXP_NAME)
 597                 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 598                     SSH2_FXP_NAME, type);
 599
 600         count = buffer_get_int(&msg);
 601         if (count != 1)
 602                 fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count);
 603
 604         filename = buffer_get_string(&msg, NULL);
 605         longname = buffer_get_string(&msg, NULL);
 606         a = decode_attrib(&msg);
 607
 608         debug3("SSH_FXP_REALPATH %s -> %s", path, filename);
 609
 610         xfree(longname);
 611
 612         buffer_free(&msg);
 613
 614         return(filename);
 615 }
 616
 617 int
 618 do_rename(struct sftp_conn *conn, char *oldpath, char *newpath)
 619 {
 620         Buffer msg;
 621         u_int status, id;
 622
 623         buffer_init(&msg);
 624
 625         /* Send rename request */
 626         id = conn->msg_id++;
 627         buffer_put_char(&msg, SSH2_FXP_RENAME);
 628         buffer_put_int(&msg, id);
 629         buffer_put_cstring(&msg, oldpath);
 630         buffer_put_cstring(&msg, newpath);
 631         send_msg(conn->fd_out, &msg);
 632         debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath,
 633             newpath);
 634         buffer_free(&msg);
 635
 636         status = get_status(conn->fd_in, id);
 637         if (status != SSH2_FX_OK)
 638                 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
 639                     newpath, fx2txt(status));
 640
 641         return(status);
 642 }
 643
 644 int
 645 do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath)
 646 {
 647         Buffer msg;
 648         u_int status, id;
 649
 650         if (conn->version < 3) {
 651                 error("This server does not support the symlink operation");
 652                 return(SSH2_FX_OP_UNSUPPORTED);
 653         }
 654
 655         buffer_init(&msg);
 656
 657         /* Send symlink request */
 658         id = conn->msg_id++;
 659         buffer_put_char(&msg, SSH2_FXP_SYMLINK);
 660         buffer_put_int(&msg, id);
 661         buffer_put_cstring(&msg, oldpath);
 662         buffer_put_cstring(&msg, newpath);
 663         send_msg(conn->fd_out, &msg);
 664         debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath,
 665             newpath);
 666         buffer_free(&msg);
 667
 668         status = get_status(conn->fd_in, id);
 669         if (status != SSH2_FX_OK)
 670                 error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath,
 671                     newpath, fx2txt(status));
 672
 673         return(status);
 674 }
 675
 676 char *
 677 do_readlink(struct sftp_conn *conn, char *path)
 678 {
 679         Buffer msg;
 680         u_int type, expected_id, count, id;
 681         char *filename, *longname;
 682         Attrib *a;
 683
 684         expected_id = id = conn->msg_id++;
 685         send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path,
 686             strlen(path));
 687
 688         buffer_init(&msg);
 689
 690         get_msg(conn->fd_in, &msg);
 691         type = buffer_get_char(&msg);
 692         id = buffer_get_int(&msg);
 693
 694         if (id != expected_id)
 695                 fatal("ID mismatch (%u != %u)", id, expected_id);
 696
 697         if (type == SSH2_FXP_STATUS) {
 698                 u_int status = buffer_get_int(&msg);
 699
 700                 error("Couldn't readlink: %s", fx2txt(status));
 701                 return(NULL);
 702         } else if (type != SSH2_FXP_NAME)
 703                 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 704                     SSH2_FXP_NAME, type);
 705
 706         count = buffer_get_int(&msg);
 707         if (count != 1)
 708                 fatal("Got multiple names (%d) from SSH_FXP_READLINK", count);
 709
 710         filename = buffer_get_string(&msg, NULL);
 711         longname = buffer_get_string(&msg, NULL);
 712         a = decode_attrib(&msg);
 713
 714         debug3("SSH_FXP_READLINK %s -> %s", path, filename);
 715
 716         xfree(longname);
 717
 718         buffer_free(&msg);
 719
 720         return(filename);
 721 }
 722
 723 static void
 724 send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len,
 725     char *handle, u_int handle_len)
 726 {
 727         Buffer msg;
 728
 729         buffer_init(&msg);
 730         buffer_clear(&msg);
 731         buffer_put_char(&msg, SSH2_FXP_READ);
 732         buffer_put_int(&msg, id);
 733         buffer_put_string(&msg, handle, handle_len);
 734         buffer_put_int64(&msg, offset);
 735         buffer_put_int(&msg, len);
 736         send_msg(fd_out, &msg);
 737         buffer_free(&msg);
 738 }
 739
 740 int
 741 do_download(struct sftp_conn *conn, char *remote_path, char *local_path,
 742     int pflag)
 743 {
 744         Attrib junk, *a;
 745         Buffer msg;
 746         char *handle;
 747         int local_fd, status = 0, write_error;
 748         int read_error, write_errno;
 749         u_int64_t offset, size;
 750         u_int handle_len, mode, type, id, buflen, num_req, max_req;
 751         off_t progress_counter;
 752         struct request {
 753                 u_int id;
 754                 u_int len;
 755                 u_int64_t offset;
 756                 TAILQ_ENTRY(request) tq;
 757         };
 758         TAILQ_HEAD(reqhead, request) requests;
 759         struct request *req;
 760
 761         TAILQ_INIT(&requests);
 762
 763         a = do_stat(conn, remote_path, 0);
 764         if (a == NULL)
 765                 return(-1);
 766
 767         /* XXX: should we preserve set[ug]id? */
 768         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 769                 mode = a->perm & 0777;
 770         else
 771                 mode = 0666;
 772
 773         if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
 774             (!S_ISREG(a->perm))) {
 775                 error("Cannot download non-regular file: %s", remote_path);
 776                 return(-1);
 777         }
 778
 779         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
 780                 size = a->size;
 781         else
 782                 size = 0;
 783
 784         buflen = conn->transfer_buflen;
 785         buffer_init(&msg);
 786
 787         /* Send open request */
 788         id = conn->msg_id++;
 789         buffer_put_char(&msg, SSH2_FXP_OPEN);
 790         buffer_put_int(&msg, id);
 791         buffer_put_cstring(&msg, remote_path);
 792         buffer_put_int(&msg, SSH2_FXF_READ);
 793         attrib_clear(&junk); /* Send empty attributes */
 794         encode_attrib(&msg, &junk);
 795         send_msg(conn->fd_out, &msg);
 796         debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
 797
 798         handle = get_handle(conn->fd_in, id, &handle_len);
 799         if (handle == NULL) {
 800                 buffer_free(&msg);
 801                 return(-1);
 802         }
 803
 804         local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC,
 805             mode | S_IWRITE);
 806         if (local_fd == -1) {
 807                 error("Couldn't open local file \"%s\" for writing: %s",
 808                     local_path, strerror(errno));
 809                 buffer_free(&msg);
 810                 xfree(handle);
 811                 return(-1);
 812         }
 813
 814         /* Read from remote and write to local */
 815         write_error = read_error = write_errno = num_req = offset = 0;
 816         max_req = 1;
 817         progress_counter = 0;
 818
 819         if (showprogress && size != 0)
 820                 start_progress_meter(remote_path, size, &progress_counter);
 821
 822         while (num_req > 0 || max_req > 0) {
 823                 char *data;
 824                 u_int len;
 825
 826                 /*
 827                  * Simulate EOF on interrupt: stop sending new requests and
 828                  * allow outstanding requests to drain gracefully
 829                  */
 830                 if (interrupted) {
 831                         if (num_req == 0) /* If we haven't started yet... */
 832                                 break;
 833                         max_req = 0;
 834                 }
 835
 836                 /* Send some more requests */
 837                 while (num_req < max_req) {
 838                         debug3("Request range %llu -> %llu (%d/%d)",
 839                             (unsigned long long)offset,
 840                             (unsigned long long)offset + buflen - 1,
 841                             num_req, max_req);
 842                         req = xmalloc(sizeof(*req));
 843                         req->id = conn->msg_id++;
 844                         req->len = buflen;
 845                         req->offset = offset;
 846                         offset += buflen;
 847                         num_req++;
 848                         TAILQ_INSERT_TAIL(&requests, req, tq);
 849                         send_read_request(conn->fd_out, req->id, req->offset,
 850                             req->len, handle, handle_len);
 851                 }
 852
 853                 buffer_clear(&msg);
 854                 get_msg(conn->fd_in, &msg);
 855                 type = buffer_get_char(&msg);
 856                 id = buffer_get_int(&msg);
 857                 debug3("Received reply T:%u I:%u R:%d", type, id, max_req);
 858
 859                 /* Find the request in our queue */
 860                 for (req = TAILQ_FIRST(&requests);
 861                     req != NULL && req->id != id;
 862                     req = TAILQ_NEXT(req, tq))
 863                         ;
 864                 if (req == NULL)
 865                         fatal("Unexpected reply %u", id);
 866
 867                 switch (type) {
 868                 case SSH2_FXP_STATUS:
 869                         status = buffer_get_int(&msg);
 870                         if (status != SSH2_FX_EOF)
 871                                 read_error = 1;
 872                         max_req = 0;
 873                         TAILQ_REMOVE(&requests, req, tq);
 874                         xfree(req);
 875                         num_req--;
 876                         break;
 877                 case SSH2_FXP_DATA:
 878                         data = buffer_get_string(&msg, &len);
 879                         debug3("Received data %llu -> %llu",
 880                             (unsigned long long)req->offset,
 881                             (unsigned long long)req->offset + len - 1);
 882                         if (len > req->len)
 883                                 fatal("Received more data than asked for "
 884                                     "%u > %u", len, req->len);
 885                         if ((lseek(local_fd, req->offset, SEEK_SET) == -1 ||
 886                             atomicio(vwrite, local_fd, data, len) != len) &&
 887                             !write_error) {
 888                                 write_errno = errno;
 889                                 write_error = 1;
 890                                 max_req = 0;
 891                         }
 892                         progress_counter += len;
 893                         xfree(data);
 894
 895                         if (len == req->len) {
 896                                 TAILQ_REMOVE(&requests, req, tq);
 897                                 xfree(req);
 898                                 num_req--;
 899                         } else {
 900                                 /* Resend the request for the missing data */
 901                                 debug3("Short data block, re-requesting "
 902                                     "%llu -> %llu (%2d)",
 903                                     (unsigned long long)req->offset + len,
 904                                     (unsigned long long)req->offset +
 905                                     req->len - 1, num_req);
 906                                 req->id = conn->msg_id++;
 907                                 req->len -= len;
 908                                 req->offset += len;
 909                                 send_read_request(conn->fd_out, req->id,
 910                                     req->offset, req->len, handle, handle_len);
 911                                 /* Reduce the request size */
 912                                 if (len < buflen)
 913                                         buflen = MAX(MIN_READ_SIZE, len);
 914                         }
 915                         if (max_req > 0) { /* max_req = 0 iff EOF received */
 916                                 if (size > 0 && offset > size) {
 917                                         /* Only one request at a time
 918                                          * after the expected EOF */
 919                                         debug3("Finish at %llu (%2d)",
 920                                             (unsigned long long)offset,
 921                                             num_req);
 922                                         max_req = 1;
 923                                 } else if (max_req <= conn->num_requests) {
 924                                         ++max_req;
 925                                 }
 926                         }
 927                         break;
 928                 default:
 929                         fatal("Expected SSH2_FXP_DATA(%u) packet, got %u",
 930                             SSH2_FXP_DATA, type);
 931                 }
 932         }
 933
 934         if (showprogress && size)
 935                 stop_progress_meter();
 936
 937         /* Sanity check */
 938         if (TAILQ_FIRST(&requests) != NULL)
 939                 fatal("Transfer complete, but requests still in queue");
 940
 941         if (read_error) {
 942                 error("Couldn't read from remote file \"%s\" : %s",
 943                     remote_path, fx2txt(status));
 944                 do_close(conn, handle, handle_len);
 945         } else if (write_error) {
 946                 error("Couldn't write to \"%s\": %s", local_path,
 947                     strerror(write_errno));
 948                 status = -1;
 949                 do_close(conn, handle, handle_len);
 950         } else {
 951                 status = do_close(conn, handle, handle_len);
 952
 953                 /* Override umask and utimes if asked */
 954 #ifdef HAVE_FCHMOD
 955                 if (pflag && fchmod(local_fd, mode) == -1)
 956 #else
 957                 if (pflag && chmod(local_path, mode) == -1)
 958 #endif /* HAVE_FCHMOD */
 959                         error("Couldn't set mode on \"%s\": %s", local_path,
 960                             strerror(errno));
 961                 if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) {
 962                         struct timeval tv[2];
 963                         tv[0].tv_sec = a->atime;
 964                         tv[1].tv_sec = a->mtime;
 965                         tv[0].tv_usec = tv[1].tv_usec = 0;
 966                         if (utimes(local_path, tv) == -1)
 967                                 error("Can't set times on \"%s\": %s",
 968                                     local_path, strerror(errno));
 969                 }
 970         }
 971         close(local_fd);
 972         buffer_free(&msg);
 973         xfree(handle);
 974
 975         return(status);
 976 }
 977
 978 int
 979 do_upload(struct sftp_conn *conn, char *local_path, char *remote_path,
 980     int pflag)
 981 {
 982         int local_fd, status;
 983         u_int handle_len, id, type;
 984         u_int64_t offset;
 985         char *handle, *data;
 986         Buffer msg;
 987         struct stat sb;
 988         Attrib a;
 989         u_int32_t startid;
 990         u_int32_t ackid;
 991         struct outstanding_ack {
 992                 u_int id;
 993                 u_int len;
 994                 u_int64_t offset;
 995                 TAILQ_ENTRY(outstanding_ack) tq;
 996         };
 997         TAILQ_HEAD(ackhead, outstanding_ack) acks;
 998         struct outstanding_ack *ack = NULL;
 999
1000         TAILQ_INIT(&acks);
1001
1002         if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) {
1003                 error("Couldn't open local file \"%s\" for reading: %s",
1004                     local_path, strerror(errno));
1005                 return(-1);
1006         }
1007         if (fstat(local_fd, &sb) == -1) {
1008                 error("Couldn't fstat local file \"%s\": %s",
1009                     local_path, strerror(errno));
1010                 close(local_fd);
1011                 return(-1);
1012         }
1013         if (!S_ISREG(sb.st_mode)) {
1014                 error("%s is not a regular file", local_path);
1015                 close(local_fd);
1016                 return(-1);
1017         }
1018         stat_to_attrib(&sb, &a);
1019
1020         a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
1021         a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
1022         a.perm &= 0777;
1023         if (!pflag)
1024                 a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
1025
1026         buffer_init(&msg);
1027
1028         /* Send open request */
1029         id = conn->msg_id++;
1030         buffer_put_char(&msg, SSH2_FXP_OPEN);
1031         buffer_put_int(&msg, id);
1032         buffer_put_cstring(&msg, remote_path);
1033         buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC);
1034         encode_attrib(&msg, &a);
1035         send_msg(conn->fd_out, &msg);
1036         debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
1037
1038         buffer_clear(&msg);
1039
1040         handle = get_handle(conn->fd_in, id, &handle_len);
1041         if (handle == NULL) {
1042                 close(local_fd);
1043                 buffer_free(&msg);
1044                 return(-1);
1045         }
1046
1047         startid = ackid = id + 1;
1048         data = xmalloc(conn->transfer_buflen);
1049
1050         /* Read from local and write to remote */
1051         offset = 0;
1052         if (showprogress)
1053                 start_progress_meter(local_path, sb.st_size, &offset);
1054
1055         for (;;) {
1056                 int len;
1057
1058                 /*
1059                  * Can't use atomicio here because it returns 0 on EOF,
1060                  * thus losing the last block of the file.
1061                  * Simulate an EOF on interrupt, allowing ACKs from the
1062                  * server to drain.
1063                  */
1064                 if (interrupted)
1065                         len = 0;
1066                 else do
1067                         len = read(local_fd, data, conn->transfer_buflen);
1068                 while ((len == -1) && (errno == EINTR || errno == EAGAIN));
1069
1070                 if (len == -1)
1071                         fatal("Couldn't read from \"%s\": %s", local_path,
1072                             strerror(errno));
1073
1074                 if (len != 0) {
1075                         ack = xmalloc(sizeof(*ack));
1076                         ack->id = ++id;
1077                         ack->offset = offset;
1078                         ack->len = len;
1079                         TAILQ_INSERT_TAIL(&acks, ack, tq);
1080
1081                         buffer_clear(&msg);
1082                         buffer_put_char(&msg, SSH2_FXP_WRITE);
1083                         buffer_put_int(&msg, ack->id);
1084                         buffer_put_string(&msg, handle, handle_len);
1085                         buffer_put_int64(&msg, offset);
1086                         buffer_put_string(&msg, data, len);
1087                         send_msg(conn->fd_out, &msg);
1088                         debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u",
1089                             id, (unsigned long long)offset, len);
1090                 } else if (TAILQ_FIRST(&acks) == NULL)
1091                         break;
1092
1093                 if (ack == NULL)
1094                         fatal("Unexpected ACK %u", id);
1095
1096                 if (id == startid || len == 0 ||
1097                     id - ackid >= conn->num_requests) {
1098                         u_int r_id;
1099
1100                         buffer_clear(&msg);
1101                         get_msg(conn->fd_in, &msg);
1102                         type = buffer_get_char(&msg);
1103                         r_id = buffer_get_int(&msg);
1104
1105                         if (type != SSH2_FXP_STATUS)
1106                                 fatal("Expected SSH2_FXP_STATUS(%d) packet, "
1107                                     "got %d", SSH2_FXP_STATUS, type);
1108
1109                         status = buffer_get_int(&msg);
1110                         debug3("SSH2_FXP_STATUS %d", status);
1111
1112                         /* Find the request in our queue */
1113                         for (ack = TAILQ_FIRST(&acks);
1114                             ack != NULL && ack->id != r_id;
1115                             ack = TAILQ_NEXT(ack, tq))
1116                                 ;
1117                         if (ack == NULL)
1118                                 fatal("Can't find request for ID %u", r_id);
1119                         TAILQ_REMOVE(&acks, ack, tq);
1120
1121                         if (status != SSH2_FX_OK) {
1122                                 error("Couldn't write to remote file \"%s\": %s",
1123                                     remote_path, fx2txt(status));
1124                                 do_close(conn, handle, handle_len);
1125                                 close(local_fd);
1126                                 xfree(data);
1127                                 xfree(ack);
1128                                 goto done;
1129                         }
1130                         debug3("In write loop, ack for %u %u bytes at %llu",
1131                             ack->id, ack->len, (unsigned long long)ack->offset);
1132                         ++ackid;
1133                         xfree(ack);
1134                 }
1135                 offset += len;
1136         }
1137         if (showprogress)
1138                 stop_progress_meter();
1139         xfree(data);
1140
1141         if (close(local_fd) == -1) {
1142                 error("Couldn't close local file \"%s\": %s", local_path,
1143                     strerror(errno));
1144                 do_close(conn, handle, handle_len);
1145                 status = -1;
1146                 goto done;
1147         }
1148
1149         /* Override umask and utimes if asked */
1150         if (pflag)
1151                 do_fsetstat(conn, handle, handle_len, &a);
1152
1153         status = do_close(conn, handle, handle_len);
1154
1155 done:
1156         xfree(handle);
1157         buffer_free(&msg);
1158         return(status);
1159 }