sftp-client.c

   1 /* $OpenBSD: sftp-client.c,v 1.65 2006/04/16 00:54:10 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 "xmalloc.h"
  36 #include "log.h"
  37 #include "atomicio.h"
  38 #include "progressmeter.h"
  39 #include "misc.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         struct iovec iov[2];
  65
  66         if (buffer_len(m) > SFTP_MAX_MSG_LENGTH)
  67                 fatal("Outbound message too long %u", buffer_len(m));
  68
  69         /* Send length first */
  70         put_u32(mlen, buffer_len(m));
  71         iov[0].iov_base = mlen;
  72         iov[0].iov_len = sizeof(mlen);
  73         iov[1].iov_base = buffer_ptr(m);
  74         iov[1].iov_len = buffer_len(m);
  75
  76         if (atomiciov(writev, fd, iov, 2) != buffer_len(m) + sizeof(mlen))
  77                 fatal("Couldn't send packet: %s", strerror(errno));
  78
  79         buffer_clear(m);
  80 }
  81
  82 static void
  83 get_msg(int fd, Buffer *m)
  84 {
  85         u_int msg_len;
  86
  87         buffer_append_space(m, 4);
  88         if (atomicio(read, fd, buffer_ptr(m), 4) != 4) {
  89                 if (errno == EPIPE)
  90                         fatal("Connection closed");
  91                 else
  92                         fatal("Couldn't read packet: %s", strerror(errno));
  93         }
  94
  95         msg_len = buffer_get_int(m);
  96         if (msg_len > SFTP_MAX_MSG_LENGTH)
  97                 fatal("Received message too long %u", msg_len);
  98
  99         buffer_append_space(m, msg_len);
 100         if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
 101                 if (errno == EPIPE)
 102                         fatal("Connection closed");
 103                 else
 104                         fatal("Read packet: %s", strerror(errno));
 105         }
 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                 buffer_free(&msg);
 183                 return(NULL);
 184         } else if (type != SSH2_FXP_HANDLE)
 185                 fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u",
 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:%u I:%u", type, id);
 208         if (id != expected_id)
 209                 fatal("ID mismatch (%u != %u)", 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                 buffer_free(&msg);
 218                 return(NULL);
 219         } else if (type != SSH2_FXP_ATTRS) {
 220                 fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u",
 221                     SSH2_FXP_ATTRS, type);
 222         }
 223         a = decode_attrib(&msg);
 224         buffer_free(&msg);
 225
 226         return(a);
 227 }
 228
 229 struct sftp_conn *
 230 do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests)
 231 {
 232         u_int type;
 233         int version;
 234         Buffer msg;
 235         struct sftp_conn *ret;
 236
 237         buffer_init(&msg);
 238         buffer_put_char(&msg, SSH2_FXP_INIT);
 239         buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
 240         send_msg(fd_out, &msg);
 241
 242         buffer_clear(&msg);
 243
 244         get_msg(fd_in, &msg);
 245
 246         /* Expecting a VERSION reply */
 247         if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) {
 248                 error("Invalid packet back from SSH2_FXP_INIT (type %u)",
 249                     type);
 250                 buffer_free(&msg);
 251                 return(NULL);
 252         }
 253         version = buffer_get_int(&msg);
 254
 255         debug2("Remote version: %d", version);
 256
 257         /* Check for extensions */
 258         while (buffer_len(&msg) > 0) {
 259                 char *name = buffer_get_string(&msg, NULL);
 260                 char *value = buffer_get_string(&msg, NULL);
 261
 262                 debug2("Init extension: \"%s\"", name);
 263                 xfree(name);
 264                 xfree(value);
 265         }
 266
 267         buffer_free(&msg);
 268
 269         ret = xmalloc(sizeof(*ret));
 270         ret->fd_in = fd_in;
 271         ret->fd_out = fd_out;
 272         ret->transfer_buflen = transfer_buflen;
 273         ret->num_requests = num_requests;
 274         ret->version = version;
 275         ret->msg_id = 1;
 276
 277         /* Some filexfer v.0 servers don't support large packets */
 278         if (version == 0)
 279                 ret->transfer_buflen = MIN(ret->transfer_buflen, 20480);
 280
 281         return(ret);
 282 }
 283
 284 u_int
 285 sftp_proto_version(struct sftp_conn *conn)
 286 {
 287         return(conn->version);
 288 }
 289
 290 int
 291 do_close(struct sftp_conn *conn, char *handle, u_int handle_len)
 292 {
 293         u_int id, status;
 294         Buffer msg;
 295
 296         buffer_init(&msg);
 297
 298         id = conn->msg_id++;
 299         buffer_put_char(&msg, SSH2_FXP_CLOSE);
 300         buffer_put_int(&msg, id);
 301         buffer_put_string(&msg, handle, handle_len);
 302         send_msg(conn->fd_out, &msg);
 303         debug3("Sent message SSH2_FXP_CLOSE I:%u", id);
 304
 305         status = get_status(conn->fd_in, id);
 306         if (status != SSH2_FX_OK)
 307                 error("Couldn't close file: %s", fx2txt(status));
 308
 309         buffer_free(&msg);
 310
 311         return(status);
 312 }
 313
 314
 315 static int
 316 do_lsreaddir(struct sftp_conn *conn, char *path, int printflag,
 317     SFTP_DIRENT ***dir)
 318 {
 319         Buffer msg;
 320         u_int count, type, id, handle_len, i, expected_id, ents = 0;
 321         char *handle;
 322
 323         id = conn->msg_id++;
 324
 325         buffer_init(&msg);
 326         buffer_put_char(&msg, SSH2_FXP_OPENDIR);
 327         buffer_put_int(&msg, id);
 328         buffer_put_cstring(&msg, path);
 329         send_msg(conn->fd_out, &msg);
 330
 331         buffer_clear(&msg);
 332
 333         handle = get_handle(conn->fd_in, id, &handle_len);
 334         if (handle == NULL)
 335                 return(-1);
 336
 337         if (dir) {
 338                 ents = 0;
 339                 *dir = xmalloc(sizeof(**dir));
 340                 (*dir)[0] = NULL;
 341         }
 342
 343         for (; !interrupted;) {
 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, ents + 2, sizeof(**dir));
 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         /* Don't return partial matches on interrupt */
 418         if (interrupted && dir != NULL && *dir != NULL) {
 419                 free_sftp_dirents(*dir);
 420                 *dir = xmalloc(sizeof(**dir));
 421                 **dir = NULL;
 422         }
 423
 424         return(0);
 425 }
 426
 427 int
 428 do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir)
 429 {
 430         return(do_lsreaddir(conn, path, 0, dir));
 431 }
 432
 433 void free_sftp_dirents(SFTP_DIRENT **s)
 434 {
 435         int i;
 436
 437         for (i = 0; s[i]; i++) {
 438                 xfree(s[i]->filename);
 439                 xfree(s[i]->longname);
 440                 xfree(s[i]);
 441         }
 442         xfree(s);
 443 }
 444
 445 int
 446 do_rm(struct sftp_conn *conn, char *path)
 447 {
 448         u_int status, id;
 449
 450         debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
 451
 452         id = conn->msg_id++;
 453         send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path,
 454             strlen(path));
 455         status = get_status(conn->fd_in, id);
 456         if (status != SSH2_FX_OK)
 457                 error("Couldn't delete file: %s", fx2txt(status));
 458         return(status);
 459 }
 460
 461 int
 462 do_mkdir(struct sftp_conn *conn, char *path, Attrib *a)
 463 {
 464         u_int status, id;
 465
 466         id = conn->msg_id++;
 467         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path,
 468             strlen(path), a);
 469
 470         status = get_status(conn->fd_in, id);
 471         if (status != SSH2_FX_OK)
 472                 error("Couldn't create directory: %s", fx2txt(status));
 473
 474         return(status);
 475 }
 476
 477 int
 478 do_rmdir(struct sftp_conn *conn, char *path)
 479 {
 480         u_int status, id;
 481
 482         id = conn->msg_id++;
 483         send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path,
 484             strlen(path));
 485
 486         status = get_status(conn->fd_in, id);
 487         if (status != SSH2_FX_OK)
 488                 error("Couldn't remove directory: %s", fx2txt(status));
 489
 490         return(status);
 491 }
 492
 493 Attrib *
 494 do_stat(struct sftp_conn *conn, char *path, int quiet)
 495 {
 496         u_int id;
 497
 498         id = conn->msg_id++;
 499
 500         send_string_request(conn->fd_out, id,
 501             conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT,
 502             path, strlen(path));
 503
 504         return(get_decode_stat(conn->fd_in, id, quiet));
 505 }
 506
 507 Attrib *
 508 do_lstat(struct sftp_conn *conn, char *path, int quiet)
 509 {
 510         u_int id;
 511
 512         if (conn->version == 0) {
 513                 if (quiet)
 514                         debug("Server version does not support lstat operation");
 515                 else
 516                         logit("Server version does not support lstat operation");
 517                 return(do_stat(conn, path, quiet));
 518         }
 519
 520         id = conn->msg_id++;
 521         send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path,
 522             strlen(path));
 523
 524         return(get_decode_stat(conn->fd_in, id, quiet));
 525 }
 526
 527 Attrib *
 528 do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet)
 529 {
 530         u_int id;
 531
 532         id = conn->msg_id++;
 533         send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle,
 534             handle_len);
 535
 536         return(get_decode_stat(conn->fd_in, id, quiet));
 537 }
 538
 539 int
 540 do_setstat(struct sftp_conn *conn, char *path, Attrib *a)
 541 {
 542         u_int status, id;
 543
 544         id = conn->msg_id++;
 545         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path,
 546             strlen(path), a);
 547
 548         status = get_status(conn->fd_in, id);
 549         if (status != SSH2_FX_OK)
 550                 error("Couldn't setstat on \"%s\": %s", path,
 551                     fx2txt(status));
 552
 553         return(status);
 554 }
 555
 556 int
 557 do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len,
 558     Attrib *a)
 559 {
 560         u_int status, id;
 561
 562         id = conn->msg_id++;
 563         send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle,
 564             handle_len, a);
 565
 566         status = get_status(conn->fd_in, id);
 567         if (status != SSH2_FX_OK)
 568                 error("Couldn't fsetstat: %s", fx2txt(status));
 569
 570         return(status);
 571 }
 572
 573 char *
 574 do_realpath(struct sftp_conn *conn, char *path)
 575 {
 576         Buffer msg;
 577         u_int type, expected_id, count, id;
 578         char *filename, *longname;
 579         Attrib *a;
 580
 581         expected_id = id = conn->msg_id++;
 582         send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path,
 583             strlen(path));
 584
 585         buffer_init(&msg);
 586
 587         get_msg(conn->fd_in, &msg);
 588         type = buffer_get_char(&msg);
 589         id = buffer_get_int(&msg);
 590
 591         if (id != expected_id)
 592                 fatal("ID mismatch (%u != %u)", id, expected_id);
 593
 594         if (type == SSH2_FXP_STATUS) {
 595                 u_int status = buffer_get_int(&msg);
 596
 597                 error("Couldn't canonicalise: %s", fx2txt(status));
 598                 return(NULL);
 599         } else if (type != SSH2_FXP_NAME)
 600                 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 601                     SSH2_FXP_NAME, type);
 602
 603         count = buffer_get_int(&msg);
 604         if (count != 1)
 605                 fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count);
 606
 607         filename = buffer_get_string(&msg, NULL);
 608         longname = buffer_get_string(&msg, NULL);
 609         a = decode_attrib(&msg);
 610
 611         debug3("SSH_FXP_REALPATH %s -> %s", path, filename);
 612
 613         xfree(longname);
 614
 615         buffer_free(&msg);
 616
 617         return(filename);
 618 }
 619
 620 int
 621 do_rename(struct sftp_conn *conn, char *oldpath, char *newpath)
 622 {
 623         Buffer msg;
 624         u_int status, id;
 625
 626         buffer_init(&msg);
 627
 628         /* Send rename request */
 629         id = conn->msg_id++;
 630         buffer_put_char(&msg, SSH2_FXP_RENAME);
 631         buffer_put_int(&msg, id);
 632         buffer_put_cstring(&msg, oldpath);
 633         buffer_put_cstring(&msg, newpath);
 634         send_msg(conn->fd_out, &msg);
 635         debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath,
 636             newpath);
 637         buffer_free(&msg);
 638
 639         status = get_status(conn->fd_in, id);
 640         if (status != SSH2_FX_OK)
 641                 error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
 642                     newpath, fx2txt(status));
 643
 644         return(status);
 645 }
 646
 647 int
 648 do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath)
 649 {
 650         Buffer msg;
 651         u_int status, id;
 652
 653         if (conn->version < 3) {
 654                 error("This server does not support the symlink operation");
 655                 return(SSH2_FX_OP_UNSUPPORTED);
 656         }
 657
 658         buffer_init(&msg);
 659
 660         /* Send symlink request */
 661         id = conn->msg_id++;
 662         buffer_put_char(&msg, SSH2_FXP_SYMLINK);
 663         buffer_put_int(&msg, id);
 664         buffer_put_cstring(&msg, oldpath);
 665         buffer_put_cstring(&msg, newpath);
 666         send_msg(conn->fd_out, &msg);
 667         debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath,
 668             newpath);
 669         buffer_free(&msg);
 670
 671         status = get_status(conn->fd_in, id);
 672         if (status != SSH2_FX_OK)
 673                 error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath,
 674                     newpath, fx2txt(status));
 675
 676         return(status);
 677 }
 678
 679 char *
 680 do_readlink(struct sftp_conn *conn, char *path)
 681 {
 682         Buffer msg;
 683         u_int type, expected_id, count, id;
 684         char *filename, *longname;
 685         Attrib *a;
 686
 687         expected_id = id = conn->msg_id++;
 688         send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path,
 689             strlen(path));
 690
 691         buffer_init(&msg);
 692
 693         get_msg(conn->fd_in, &msg);
 694         type = buffer_get_char(&msg);
 695         id = buffer_get_int(&msg);
 696
 697         if (id != expected_id)
 698                 fatal("ID mismatch (%u != %u)", id, expected_id);
 699
 700         if (type == SSH2_FXP_STATUS) {
 701                 u_int status = buffer_get_int(&msg);
 702
 703                 error("Couldn't readlink: %s", fx2txt(status));
 704                 return(NULL);
 705         } else if (type != SSH2_FXP_NAME)
 706                 fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
 707                     SSH2_FXP_NAME, type);
 708
 709         count = buffer_get_int(&msg);
 710         if (count != 1)
 711                 fatal("Got multiple names (%d) from SSH_FXP_READLINK", count);
 712
 713         filename = buffer_get_string(&msg, NULL);
 714         longname = buffer_get_string(&msg, NULL);
 715         a = decode_attrib(&msg);
 716
 717         debug3("SSH_FXP_READLINK %s -> %s", path, filename);
 718
 719         xfree(longname);
 720
 721         buffer_free(&msg);
 722
 723         return(filename);
 724 }
 725
 726 static void
 727 send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len,
 728     char *handle, u_int handle_len)
 729 {
 730         Buffer msg;
 731
 732         buffer_init(&msg);
 733         buffer_clear(&msg);
 734         buffer_put_char(&msg, SSH2_FXP_READ);
 735         buffer_put_int(&msg, id);
 736         buffer_put_string(&msg, handle, handle_len);
 737         buffer_put_int64(&msg, offset);
 738         buffer_put_int(&msg, len);
 739         send_msg(fd_out, &msg);
 740         buffer_free(&msg);
 741 }
 742
 743 int
 744 do_download(struct sftp_conn *conn, char *remote_path, char *local_path,
 745     int pflag)
 746 {
 747         Attrib junk, *a;
 748         Buffer msg;
 749         char *handle;
 750         int local_fd, status = 0, write_error;
 751         int read_error, write_errno;
 752         u_int64_t offset, size;
 753         u_int handle_len, mode, type, id, buflen, num_req, max_req;
 754         off_t progress_counter;
 755         struct request {
 756                 u_int id;
 757                 u_int len;
 758                 u_int64_t offset;
 759                 TAILQ_ENTRY(request) tq;
 760         };
 761         TAILQ_HEAD(reqhead, request) requests;
 762         struct request *req;
 763
 764         TAILQ_INIT(&requests);
 765
 766         a = do_stat(conn, remote_path, 0);
 767         if (a == NULL)
 768                 return(-1);
 769
 770         /* XXX: should we preserve set[ug]id? */
 771         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 772                 mode = a->perm & 0777;
 773         else
 774                 mode = 0666;
 775
 776         if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
 777             (!S_ISREG(a->perm))) {
 778                 error("Cannot download non-regular file: %s", remote_path);
 779                 return(-1);
 780         }
 781
 782         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
 783                 size = a->size;
 784         else
 785                 size = 0;
 786
 787         buflen = conn->transfer_buflen;
 788         buffer_init(&msg);
 789
 790         /* Send open request */
 791         id = conn->msg_id++;
 792         buffer_put_char(&msg, SSH2_FXP_OPEN);
 793         buffer_put_int(&msg, id);
 794         buffer_put_cstring(&msg, remote_path);
 795         buffer_put_int(&msg, SSH2_FXF_READ);
 796         attrib_clear(&junk); /* Send empty attributes */
 797         encode_attrib(&msg, &junk);
 798         send_msg(conn->fd_out, &msg);
 799         debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
 800
 801         handle = get_handle(conn->fd_in, id, &handle_len);
 802         if (handle == NULL) {
 803                 buffer_free(&msg);
 804                 return(-1);
 805         }
 806
 807         local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC,
 808             mode | S_IWRITE);
 809         if (local_fd == -1) {
 810                 error("Couldn't open local file \"%s\" for writing: %s",
 811                     local_path, strerror(errno));
 812                 buffer_free(&msg);
 813                 xfree(handle);
 814                 return(-1);
 815         }
 816
 817         /* Read from remote and write to local */
 818         write_error = read_error = write_errno = num_req = offset = 0;
 819         max_req = 1;
 820         progress_counter = 0;
 821
 822         if (showprogress && size != 0)
 823                 start_progress_meter(remote_path, size, &progress_counter);
 824
 825         while (num_req > 0 || max_req > 0) {
 826                 char *data;
 827                 u_int len;
 828
 829                 /*
 830                  * Simulate EOF on interrupt: stop sending new requests and
 831                  * allow outstanding requests to drain gracefully
 832                  */
 833                 if (interrupted) {
 834                         if (num_req == 0) /* If we haven't started yet... */
 835                                 break;
 836                         max_req = 0;
 837                 }
 838
 839                 /* Send some more requests */
 840                 while (num_req < max_req) {
 841                         debug3("Request range %llu -> %llu (%d/%d)",
 842                             (unsigned long long)offset,
 843                             (unsigned long long)offset + buflen - 1,
 844                             num_req, max_req);
 845                         req = xmalloc(sizeof(*req));
 846                         req->id = conn->msg_id++;
 847                         req->len = buflen;
 848                         req->offset = offset;
 849                         offset += buflen;
 850                         num_req++;
 851                         TAILQ_INSERT_TAIL(&requests, req, tq);
 852                         send_read_request(conn->fd_out, req->id, req->offset,
 853                             req->len, handle, handle_len);
 854                 }
 855
 856                 buffer_clear(&msg);
 857                 get_msg(conn->fd_in, &msg);
 858                 type = buffer_get_char(&msg);
 859                 id = buffer_get_int(&msg);
 860                 debug3("Received reply T:%u I:%u R:%d", type, id, max_req);
 861
 862                 /* Find the request in our queue */
 863                 for (req = TAILQ_FIRST(&requests);
 864                     req != NULL && req->id != id;
 865                     req = TAILQ_NEXT(req, tq))
 866                         ;
 867                 if (req == NULL)
 868                         fatal("Unexpected reply %u", id);
 869
 870                 switch (type) {
 871                 case SSH2_FXP_STATUS:
 872                         status = buffer_get_int(&msg);
 873                         if (status != SSH2_FX_EOF)
 874                                 read_error = 1;
 875                         max_req = 0;
 876                         TAILQ_REMOVE(&requests, req, tq);
 877                         xfree(req);
 878                         num_req--;
 879                         break;
 880                 case SSH2_FXP_DATA:
 881                         data = buffer_get_string(&msg, &len);
 882                         debug3("Received data %llu -> %llu",
 883                             (unsigned long long)req->offset,
 884                             (unsigned long long)req->offset + len - 1);
 885                         if (len > req->len)
 886                                 fatal("Received more data than asked for "
 887                                     "%u > %u", len, req->len);
 888                         if ((lseek(local_fd, req->offset, SEEK_SET) == -1 ||
 889                             atomicio(vwrite, local_fd, data, len) != len) &&
 890                             !write_error) {
 891                                 write_errno = errno;
 892                                 write_error = 1;
 893                                 max_req = 0;
 894                         }
 895                         progress_counter += len;
 896                         xfree(data);
 897
 898                         if (len == req->len) {
 899                                 TAILQ_REMOVE(&requests, req, tq);
 900                                 xfree(req);
 901                                 num_req--;
 902                         } else {
 903                                 /* Resend the request for the missing data */
 904                                 debug3("Short data block, re-requesting "
 905                                     "%llu -> %llu (%2d)",
 906                                     (unsigned long long)req->offset + len,
 907                                     (unsigned long long)req->offset +
 908                                     req->len - 1, num_req);
 909                                 req->id = conn->msg_id++;
 910                                 req->len -= len;
 911                                 req->offset += len;
 912                                 send_read_request(conn->fd_out, req->id,
 913                                     req->offset, req->len, handle, handle_len);
 914                                 /* Reduce the request size */
 915                                 if (len < buflen)
 916                                         buflen = MAX(MIN_READ_SIZE, len);
 917                         }
 918                         if (max_req > 0) { /* max_req = 0 iff EOF received */
 919                                 if (size > 0 && offset > size) {
 920                                         /* Only one request at a time
 921                                          * after the expected EOF */
 922                                         debug3("Finish at %llu (%2d)",
 923                                             (unsigned long long)offset,
 924                                             num_req);
 925                                         max_req = 1;
 926                                 } else if (max_req <= conn->num_requests) {
 927                                         ++max_req;
 928                                 }
 929                         }
 930                         break;
 931                 default:
 932                         fatal("Expected SSH2_FXP_DATA(%u) packet, got %u",
 933                             SSH2_FXP_DATA, type);
 934                 }
 935         }
 936
 937         if (showprogress && size)
 938                 stop_progress_meter();
 939
 940         /* Sanity check */
 941         if (TAILQ_FIRST(&requests) != NULL)
 942                 fatal("Transfer complete, but requests still in queue");
 943
 944         if (read_error) {
 945                 error("Couldn't read from remote file \"%s\" : %s",
 946                     remote_path, fx2txt(status));
 947                 do_close(conn, handle, handle_len);
 948         } else if (write_error) {
 949                 error("Couldn't write to \"%s\": %s", local_path,
 950                     strerror(write_errno));
 951                 status = -1;
 952                 do_close(conn, handle, handle_len);
 953         } else {
 954                 status = do_close(conn, handle, handle_len);
 955
 956                 /* Override umask and utimes if asked */
 957 #ifdef HAVE_FCHMOD
 958                 if (pflag && fchmod(local_fd, mode) == -1)
 959 #else
 960                 if (pflag && chmod(local_path, mode) == -1)
 961 #endif /* HAVE_FCHMOD */
 962                         error("Couldn't set mode on \"%s\": %s", local_path,
 963                             strerror(errno));
 964                 if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) {
 965                         struct timeval tv[2];
 966                         tv[0].tv_sec = a->atime;
 967                         tv[1].tv_sec = a->mtime;
 968                         tv[0].tv_usec = tv[1].tv_usec = 0;
 969                         if (utimes(local_path, tv) == -1)
 970                                 error("Can't set times on \"%s\": %s",
 971                                     local_path, strerror(errno));
 972                 }
 973         }
 974         close(local_fd);
 975         buffer_free(&msg);
 976         xfree(handle);
 977
 978         return(status);
 979 }
 980
 981 int
 982 do_upload(struct sftp_conn *conn, char *local_path, char *remote_path,
 983     int pflag)
 984 {
 985         int local_fd, status;
 986         u_int handle_len, id, type;
 987         u_int64_t offset;
 988         char *handle, *data;
 989         Buffer msg;
 990         struct stat sb;
 991         Attrib a;
 992         u_int32_t startid;
 993         u_int32_t ackid;
 994         struct outstanding_ack {
 995                 u_int id;
 996                 u_int len;
 997                 u_int64_t offset;
 998                 TAILQ_ENTRY(outstanding_ack) tq;
 999         };
1000         TAILQ_HEAD(ackhead, outstanding_ack) acks;
1001         struct outstanding_ack *ack = NULL;
1002
1003         TAILQ_INIT(&acks);
1004
1005         if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) {
1006                 error("Couldn't open local file \"%s\" for reading: %s",
1007                     local_path, strerror(errno));
1008                 return(-1);
1009         }
1010         if (fstat(local_fd, &sb) == -1) {
1011                 error("Couldn't fstat local file \"%s\": %s",
1012                     local_path, strerror(errno));
1013                 close(local_fd);
1014                 return(-1);
1015         }
1016         if (!S_ISREG(sb.st_mode)) {
1017                 error("%s is not a regular file", local_path);
1018                 close(local_fd);
1019                 return(-1);
1020         }
1021         stat_to_attrib(&sb, &a);
1022
1023         a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
1024         a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
1025         a.perm &= 0777;
1026         if (!pflag)
1027                 a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
1028
1029         buffer_init(&msg);
1030
1031         /* Send open request */
1032         id = conn->msg_id++;
1033         buffer_put_char(&msg, SSH2_FXP_OPEN);
1034         buffer_put_int(&msg, id);
1035         buffer_put_cstring(&msg, remote_path);
1036         buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC);
1037         encode_attrib(&msg, &a);
1038         send_msg(conn->fd_out, &msg);
1039         debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
1040
1041         buffer_clear(&msg);
1042
1043         handle = get_handle(conn->fd_in, id, &handle_len);
1044         if (handle == NULL) {
1045                 close(local_fd);
1046                 buffer_free(&msg);
1047                 return(-1);
1048         }
1049
1050         startid = ackid = id + 1;
1051         data = xmalloc(conn->transfer_buflen);
1052
1053         /* Read from local and write to remote */
1054         offset = 0;
1055         if (showprogress)
1056                 start_progress_meter(local_path, sb.st_size, &offset);
1057
1058         for (;;) {
1059                 int len;
1060
1061                 /*
1062                  * Can't use atomicio here because it returns 0 on EOF,
1063                  * thus losing the last block of the file.
1064                  * Simulate an EOF on interrupt, allowing ACKs from the
1065                  * server to drain.
1066                  */
1067                 if (interrupted)
1068                         len = 0;
1069                 else do
1070                         len = read(local_fd, data, conn->transfer_buflen);
1071                 while ((len == -1) && (errno == EINTR || errno == EAGAIN));
1072
1073                 if (len == -1)
1074                         fatal("Couldn't read from \"%s\": %s", local_path,
1075                             strerror(errno));
1076
1077                 if (len != 0) {
1078                         ack = xmalloc(sizeof(*ack));
1079                         ack->id = ++id;
1080                         ack->offset = offset;
1081                         ack->len = len;
1082                         TAILQ_INSERT_TAIL(&acks, ack, tq);
1083
1084                         buffer_clear(&msg);
1085                         buffer_put_char(&msg, SSH2_FXP_WRITE);
1086                         buffer_put_int(&msg, ack->id);
1087                         buffer_put_string(&msg, handle, handle_len);
1088                         buffer_put_int64(&msg, offset);
1089                         buffer_put_string(&msg, data, len);
1090                         send_msg(conn->fd_out, &msg);
1091                         debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u",
1092                             id, (unsigned long long)offset, len);
1093                 } else if (TAILQ_FIRST(&acks) == NULL)
1094                         break;
1095
1096                 if (ack == NULL)
1097                         fatal("Unexpected ACK %u", id);
1098
1099                 if (id == startid || len == 0 ||
1100                     id - ackid >= conn->num_requests) {
1101                         u_int r_id;
1102
1103                         buffer_clear(&msg);
1104                         get_msg(conn->fd_in, &msg);
1105                         type = buffer_get_char(&msg);
1106                         r_id = buffer_get_int(&msg);
1107
1108                         if (type != SSH2_FXP_STATUS)
1109                                 fatal("Expected SSH2_FXP_STATUS(%d) packet, "
1110                                     "got %d", SSH2_FXP_STATUS, type);
1111
1112                         status = buffer_get_int(&msg);
1113                         debug3("SSH2_FXP_STATUS %d", status);
1114
1115                         /* Find the request in our queue */
1116                         for (ack = TAILQ_FIRST(&acks);
1117                             ack != NULL && ack->id != r_id;
1118                             ack = TAILQ_NEXT(ack, tq))
1119                                 ;
1120                         if (ack == NULL)
1121                                 fatal("Can't find request for ID %u", r_id);
1122                         TAILQ_REMOVE(&acks, ack, tq);
1123
1124                         if (status != SSH2_FX_OK) {
1125                                 error("Couldn't write to remote file \"%s\": %s",
1126                                     remote_path, fx2txt(status));
1127                                 do_close(conn, handle, handle_len);
1128                                 close(local_fd);
1129                                 xfree(data);
1130                                 xfree(ack);
1131                                 goto done;
1132                         }
1133                         debug3("In write loop, ack for %u %u bytes at %llu",
1134                             ack->id, ack->len, (unsigned long long)ack->offset);
1135                         ++ackid;
1136                         xfree(ack);
1137                 }
1138                 offset += len;
1139         }
1140         if (showprogress)
1141                 stop_progress_meter();
1142         xfree(data);
1143
1144         if (close(local_fd) == -1) {
1145                 error("Couldn't close local file \"%s\": %s", local_path,
1146                     strerror(errno));
1147                 do_close(conn, handle, handle_len);
1148                 status = -1;
1149                 goto done;
1150         }
1151
1152         /* Override umask and utimes if asked */
1153         if (pflag)
1154                 do_fsetstat(conn, handle, handle_len, &a);
1155
1156         status = do_close(conn, handle, handle_len);
1157
1158 done:
1159         xfree(handle);
1160         buffer_free(&msg);
1161         return(status);
1162 }