xref: /freebsd/crypto/openssh/sftp-client.c (revision 3332f1b444d4a73238e9f59cca27bfc95fe936bd)
1 /* $OpenBSD: sftp-client.c,v 1.154 2021/08/09 23:47:44 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_STATVFS_H
27 #include <sys/statvfs.h>
28 #endif
29 #include "openbsd-compat/sys-queue.h"
30 #ifdef HAVE_SYS_STAT_H
31 # include <sys/stat.h>
32 #endif
33 #ifdef HAVE_SYS_TIME_H
34 # include <sys/time.h>
35 #endif
36 #include <sys/uio.h>
37 
38 #include <dirent.h>
39 #include <errno.h>
40 #ifdef HAVE_POLL_H
41 #include <poll.h>
42 #else
43 # ifdef HAVE_SYS_POLL_H
44 #  include <sys/poll.h>
45 # endif
46 #endif
47 #include <fcntl.h>
48 #include <signal.h>
49 #include <stdarg.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54 
55 #include "xmalloc.h"
56 #include "ssherr.h"
57 #include "sshbuf.h"
58 #include "log.h"
59 #include "atomicio.h"
60 #include "progressmeter.h"
61 #include "misc.h"
62 #include "utf8.h"
63 
64 #include "sftp.h"
65 #include "sftp-common.h"
66 #include "sftp-client.h"
67 
68 extern volatile sig_atomic_t interrupted;
69 extern int showprogress;
70 
71 /* Default size of buffer for up/download */
72 #define DEFAULT_COPY_BUFLEN	32768
73 
74 /* Default number of concurrent outstanding requests */
75 #define DEFAULT_NUM_REQUESTS	64
76 
77 /* Minimum amount of data to read at a time */
78 #define MIN_READ_SIZE	512
79 
80 /* Maximum depth to descend in directory trees */
81 #define MAX_DIR_DEPTH 64
82 
83 /* Directory separator characters */
84 #ifdef HAVE_CYGWIN
85 # define SFTP_DIRECTORY_CHARS      "/\\"
86 #else /* HAVE_CYGWIN */
87 # define SFTP_DIRECTORY_CHARS      "/"
88 #endif /* HAVE_CYGWIN */
89 
90 struct sftp_conn {
91 	int fd_in;
92 	int fd_out;
93 	u_int download_buflen;
94 	u_int upload_buflen;
95 	u_int num_requests;
96 	u_int version;
97 	u_int msg_id;
98 #define SFTP_EXT_POSIX_RENAME	0x00000001
99 #define SFTP_EXT_STATVFS	0x00000002
100 #define SFTP_EXT_FSTATVFS	0x00000004
101 #define SFTP_EXT_HARDLINK	0x00000008
102 #define SFTP_EXT_FSYNC		0x00000010
103 #define SFTP_EXT_LSETSTAT	0x00000020
104 #define SFTP_EXT_LIMITS		0x00000040
105 #define SFTP_EXT_PATH_EXPAND	0x00000080
106 	u_int exts;
107 	u_int64_t limit_kbps;
108 	struct bwlimit bwlimit_in, bwlimit_out;
109 };
110 
111 /* Tracks in-progress requests during file transfers */
112 struct request {
113 	u_int id;
114 	size_t len;
115 	u_int64_t offset;
116 	TAILQ_ENTRY(request) tq;
117 };
118 TAILQ_HEAD(requests, request);
119 
120 static u_char *
121 get_handle(struct sftp_conn *conn, u_int expected_id, size_t *len,
122     const char *errfmt, ...) __attribute__((format(printf, 4, 5)));
123 
124 static struct request *
125 request_enqueue(struct requests *requests, u_int id, size_t len,
126     uint64_t offset)
127 {
128 	struct request *req;
129 
130 	req = xcalloc(1, sizeof(*req));
131 	req->id = id;
132 	req->len = len;
133 	req->offset = offset;
134 	TAILQ_INSERT_TAIL(requests, req, tq);
135 	return req;
136 }
137 
138 static struct request *
139 request_find(struct requests *requests, u_int id)
140 {
141 	struct request *req;
142 
143 	for (req = TAILQ_FIRST(requests);
144 	    req != NULL && req->id != id;
145 	    req = TAILQ_NEXT(req, tq))
146 		;
147 	return req;
148 }
149 
150 /* ARGSUSED */
151 static int
152 sftpio(void *_bwlimit, size_t amount)
153 {
154 	struct bwlimit *bwlimit = (struct bwlimit *)_bwlimit;
155 
156 	refresh_progress_meter(0);
157 	if (bwlimit != NULL)
158 		bandwidth_limit(bwlimit, amount);
159 	return 0;
160 }
161 
162 static void
163 send_msg(struct sftp_conn *conn, struct sshbuf *m)
164 {
165 	u_char mlen[4];
166 	struct iovec iov[2];
167 
168 	if (sshbuf_len(m) > SFTP_MAX_MSG_LENGTH)
169 		fatal("Outbound message too long %zu", sshbuf_len(m));
170 
171 	/* Send length first */
172 	put_u32(mlen, sshbuf_len(m));
173 	iov[0].iov_base = mlen;
174 	iov[0].iov_len = sizeof(mlen);
175 	iov[1].iov_base = (u_char *)sshbuf_ptr(m);
176 	iov[1].iov_len = sshbuf_len(m);
177 
178 	if (atomiciov6(writev, conn->fd_out, iov, 2, sftpio,
179 	    conn->limit_kbps > 0 ? &conn->bwlimit_out : NULL) !=
180 	    sshbuf_len(m) + sizeof(mlen))
181 		fatal("Couldn't send packet: %s", strerror(errno));
182 
183 	sshbuf_reset(m);
184 }
185 
186 static void
187 get_msg_extended(struct sftp_conn *conn, struct sshbuf *m, int initial)
188 {
189 	u_int msg_len;
190 	u_char *p;
191 	int r;
192 
193 	sshbuf_reset(m);
194 	if ((r = sshbuf_reserve(m, 4, &p)) != 0)
195 		fatal_fr(r, "reserve");
196 	if (atomicio6(read, conn->fd_in, p, 4, sftpio,
197 	    conn->limit_kbps > 0 ? &conn->bwlimit_in : NULL) != 4) {
198 		if (errno == EPIPE || errno == ECONNRESET)
199 			fatal("Connection closed");
200 		else
201 			fatal("Couldn't read packet: %s", strerror(errno));
202 	}
203 
204 	if ((r = sshbuf_get_u32(m, &msg_len)) != 0)
205 		fatal_fr(r, "sshbuf_get_u32");
206 	if (msg_len > SFTP_MAX_MSG_LENGTH) {
207 		do_log2(initial ? SYSLOG_LEVEL_ERROR : SYSLOG_LEVEL_FATAL,
208 		    "Received message too long %u", msg_len);
209 		fatal("Ensure the remote shell produces no output "
210 		    "for non-interactive sessions.");
211 	}
212 
213 	if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
214 		fatal_fr(r, "reserve");
215 	if (atomicio6(read, conn->fd_in, p, msg_len, sftpio,
216 	    conn->limit_kbps > 0 ? &conn->bwlimit_in : NULL)
217 	    != msg_len) {
218 		if (errno == EPIPE)
219 			fatal("Connection closed");
220 		else
221 			fatal("Read packet: %s", strerror(errno));
222 	}
223 }
224 
225 static void
226 get_msg(struct sftp_conn *conn, struct sshbuf *m)
227 {
228 	get_msg_extended(conn, m, 0);
229 }
230 
231 static void
232 send_string_request(struct sftp_conn *conn, u_int id, u_int code, const char *s,
233     u_int len)
234 {
235 	struct sshbuf *msg;
236 	int r;
237 
238 	if ((msg = sshbuf_new()) == NULL)
239 		fatal_f("sshbuf_new failed");
240 	if ((r = sshbuf_put_u8(msg, code)) != 0 ||
241 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
242 	    (r = sshbuf_put_string(msg, s, len)) != 0)
243 		fatal_fr(r, "compose");
244 	send_msg(conn, msg);
245 	debug3("Sent message fd %d T:%u I:%u", conn->fd_out, code, id);
246 	sshbuf_free(msg);
247 }
248 
249 static void
250 send_string_attrs_request(struct sftp_conn *conn, u_int id, u_int code,
251     const void *s, u_int len, Attrib *a)
252 {
253 	struct sshbuf *msg;
254 	int r;
255 
256 	if ((msg = sshbuf_new()) == NULL)
257 		fatal_f("sshbuf_new failed");
258 	if ((r = sshbuf_put_u8(msg, code)) != 0 ||
259 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
260 	    (r = sshbuf_put_string(msg, s, len)) != 0 ||
261 	    (r = encode_attrib(msg, a)) != 0)
262 		fatal_fr(r, "compose");
263 	send_msg(conn, msg);
264 	debug3("Sent message fd %d T:%u I:%u F:0x%04x M:%05o",
265 	    conn->fd_out, code, id, a->flags, a->perm);
266 	sshbuf_free(msg);
267 }
268 
269 static u_int
270 get_status(struct sftp_conn *conn, u_int expected_id)
271 {
272 	struct sshbuf *msg;
273 	u_char type;
274 	u_int id, status;
275 	int r;
276 
277 	if ((msg = sshbuf_new()) == NULL)
278 		fatal_f("sshbuf_new failed");
279 	get_msg(conn, msg);
280 	if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
281 	    (r = sshbuf_get_u32(msg, &id)) != 0)
282 		fatal_fr(r, "compose");
283 
284 	if (id != expected_id)
285 		fatal("ID mismatch (%u != %u)", id, expected_id);
286 	if (type != SSH2_FXP_STATUS)
287 		fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u",
288 		    SSH2_FXP_STATUS, type);
289 
290 	if ((r = sshbuf_get_u32(msg, &status)) != 0)
291 		fatal_fr(r, "parse");
292 	sshbuf_free(msg);
293 
294 	debug3("SSH2_FXP_STATUS %u", status);
295 
296 	return status;
297 }
298 
299 static u_char *
300 get_handle(struct sftp_conn *conn, u_int expected_id, size_t *len,
301     const char *errfmt, ...)
302 {
303 	struct sshbuf *msg;
304 	u_int id, status;
305 	u_char type;
306 	u_char *handle;
307 	char errmsg[256];
308 	va_list args;
309 	int r;
310 
311 	va_start(args, errfmt);
312 	if (errfmt != NULL)
313 		vsnprintf(errmsg, sizeof(errmsg), errfmt, args);
314 	va_end(args);
315 
316 	if ((msg = sshbuf_new()) == NULL)
317 		fatal_f("sshbuf_new failed");
318 	get_msg(conn, msg);
319 	if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
320 	    (r = sshbuf_get_u32(msg, &id)) != 0)
321 		fatal_fr(r, "parse");
322 
323 	if (id != expected_id)
324 		fatal("%s: ID mismatch (%u != %u)",
325 		    errfmt == NULL ? __func__ : errmsg, id, expected_id);
326 	if (type == SSH2_FXP_STATUS) {
327 		if ((r = sshbuf_get_u32(msg, &status)) != 0)
328 			fatal_fr(r, "parse status");
329 		if (errfmt != NULL)
330 			error("%s: %s", errmsg, fx2txt(status));
331 		sshbuf_free(msg);
332 		return(NULL);
333 	} else if (type != SSH2_FXP_HANDLE)
334 		fatal("%s: Expected SSH2_FXP_HANDLE(%u) packet, got %u",
335 		    errfmt == NULL ? __func__ : errmsg, SSH2_FXP_HANDLE, type);
336 
337 	if ((r = sshbuf_get_string(msg, &handle, len)) != 0)
338 		fatal_fr(r, "parse handle");
339 	sshbuf_free(msg);
340 
341 	return handle;
342 }
343 
344 /* XXX returing &static is error-prone. Refactor to fill *Attrib argument */
345 static Attrib *
346 get_decode_stat(struct sftp_conn *conn, u_int expected_id, int quiet)
347 {
348 	struct sshbuf *msg;
349 	u_int id;
350 	u_char type;
351 	int r;
352 	static Attrib a;
353 
354 	if ((msg = sshbuf_new()) == NULL)
355 		fatal_f("sshbuf_new failed");
356 	get_msg(conn, msg);
357 
358 	if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
359 	    (r = sshbuf_get_u32(msg, &id)) != 0)
360 		fatal_fr(r, "parse");
361 
362 	if (id != expected_id)
363 		fatal("ID mismatch (%u != %u)", id, expected_id);
364 	if (type == SSH2_FXP_STATUS) {
365 		u_int status;
366 
367 		if ((r = sshbuf_get_u32(msg, &status)) != 0)
368 			fatal_fr(r, "parse status");
369 		if (quiet)
370 			debug("Couldn't stat remote file: %s", fx2txt(status));
371 		else
372 			error("Couldn't stat remote file: %s", fx2txt(status));
373 		sshbuf_free(msg);
374 		return(NULL);
375 	} else if (type != SSH2_FXP_ATTRS) {
376 		fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u",
377 		    SSH2_FXP_ATTRS, type);
378 	}
379 	if ((r = decode_attrib(msg, &a)) != 0) {
380 		error_fr(r, "decode_attrib");
381 		sshbuf_free(msg);
382 		return NULL;
383 	}
384 	debug3("Recevied stat reply T:%u I:%u F:0x%04x M:%05o",
385 	    type, id, a.flags, a.perm);
386 	sshbuf_free(msg);
387 
388 	return &a;
389 }
390 
391 static int
392 get_decode_statvfs(struct sftp_conn *conn, struct sftp_statvfs *st,
393     u_int expected_id, int quiet)
394 {
395 	struct sshbuf *msg;
396 	u_char type;
397 	u_int id;
398 	u_int64_t flag;
399 	int r;
400 
401 	if ((msg = sshbuf_new()) == NULL)
402 		fatal_f("sshbuf_new failed");
403 	get_msg(conn, msg);
404 
405 	if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
406 	    (r = sshbuf_get_u32(msg, &id)) != 0)
407 		fatal_fr(r, "parse");
408 
409 	debug3("Received statvfs reply T:%u I:%u", type, id);
410 	if (id != expected_id)
411 		fatal("ID mismatch (%u != %u)", id, expected_id);
412 	if (type == SSH2_FXP_STATUS) {
413 		u_int status;
414 
415 		if ((r = sshbuf_get_u32(msg, &status)) != 0)
416 			fatal_fr(r, "parse status");
417 		if (quiet)
418 			debug("Couldn't statvfs: %s", fx2txt(status));
419 		else
420 			error("Couldn't statvfs: %s", fx2txt(status));
421 		sshbuf_free(msg);
422 		return -1;
423 	} else if (type != SSH2_FXP_EXTENDED_REPLY) {
424 		fatal("Expected SSH2_FXP_EXTENDED_REPLY(%u) packet, got %u",
425 		    SSH2_FXP_EXTENDED_REPLY, type);
426 	}
427 
428 	memset(st, 0, sizeof(*st));
429 	if ((r = sshbuf_get_u64(msg, &st->f_bsize)) != 0 ||
430 	    (r = sshbuf_get_u64(msg, &st->f_frsize)) != 0 ||
431 	    (r = sshbuf_get_u64(msg, &st->f_blocks)) != 0 ||
432 	    (r = sshbuf_get_u64(msg, &st->f_bfree)) != 0 ||
433 	    (r = sshbuf_get_u64(msg, &st->f_bavail)) != 0 ||
434 	    (r = sshbuf_get_u64(msg, &st->f_files)) != 0 ||
435 	    (r = sshbuf_get_u64(msg, &st->f_ffree)) != 0 ||
436 	    (r = sshbuf_get_u64(msg, &st->f_favail)) != 0 ||
437 	    (r = sshbuf_get_u64(msg, &st->f_fsid)) != 0 ||
438 	    (r = sshbuf_get_u64(msg, &flag)) != 0 ||
439 	    (r = sshbuf_get_u64(msg, &st->f_namemax)) != 0)
440 		fatal_fr(r, "parse statvfs");
441 
442 	st->f_flag = (flag & SSH2_FXE_STATVFS_ST_RDONLY) ? ST_RDONLY : 0;
443 	st->f_flag |= (flag & SSH2_FXE_STATVFS_ST_NOSUID) ? ST_NOSUID : 0;
444 
445 	sshbuf_free(msg);
446 
447 	return 0;
448 }
449 
450 struct sftp_conn *
451 do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests,
452     u_int64_t limit_kbps)
453 {
454 	u_char type;
455 	struct sshbuf *msg;
456 	struct sftp_conn *ret;
457 	int r;
458 
459 	ret = xcalloc(1, sizeof(*ret));
460 	ret->msg_id = 1;
461 	ret->fd_in = fd_in;
462 	ret->fd_out = fd_out;
463 	ret->download_buflen = ret->upload_buflen =
464 	    transfer_buflen ? transfer_buflen : DEFAULT_COPY_BUFLEN;
465 	ret->num_requests =
466 	    num_requests ? num_requests : DEFAULT_NUM_REQUESTS;
467 	ret->exts = 0;
468 	ret->limit_kbps = 0;
469 
470 	if ((msg = sshbuf_new()) == NULL)
471 		fatal_f("sshbuf_new failed");
472 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_INIT)) != 0 ||
473 	    (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0)
474 		fatal_fr(r, "parse");
475 
476 	send_msg(ret, msg);
477 
478 	get_msg_extended(ret, msg, 1);
479 
480 	/* Expecting a VERSION reply */
481 	if ((r = sshbuf_get_u8(msg, &type)) != 0)
482 		fatal_fr(r, "parse type");
483 	if (type != SSH2_FXP_VERSION) {
484 		error("Invalid packet back from SSH2_FXP_INIT (type %u)",
485 		    type);
486 		sshbuf_free(msg);
487 		free(ret);
488 		return(NULL);
489 	}
490 	if ((r = sshbuf_get_u32(msg, &ret->version)) != 0)
491 		fatal_fr(r, "parse version");
492 
493 	debug2("Remote version: %u", ret->version);
494 
495 	/* Check for extensions */
496 	while (sshbuf_len(msg) > 0) {
497 		char *name;
498 		u_char *value;
499 		size_t vlen;
500 		int known = 0;
501 
502 		if ((r = sshbuf_get_cstring(msg, &name, NULL)) != 0 ||
503 		    (r = sshbuf_get_string(msg, &value, &vlen)) != 0)
504 			fatal_fr(r, "parse extension");
505 		if (strcmp(name, "posix-rename@openssh.com") == 0 &&
506 		    strcmp((char *)value, "1") == 0) {
507 			ret->exts |= SFTP_EXT_POSIX_RENAME;
508 			known = 1;
509 		} else if (strcmp(name, "statvfs@openssh.com") == 0 &&
510 		    strcmp((char *)value, "2") == 0) {
511 			ret->exts |= SFTP_EXT_STATVFS;
512 			known = 1;
513 		} else if (strcmp(name, "fstatvfs@openssh.com") == 0 &&
514 		    strcmp((char *)value, "2") == 0) {
515 			ret->exts |= SFTP_EXT_FSTATVFS;
516 			known = 1;
517 		} else if (strcmp(name, "hardlink@openssh.com") == 0 &&
518 		    strcmp((char *)value, "1") == 0) {
519 			ret->exts |= SFTP_EXT_HARDLINK;
520 			known = 1;
521 		} else if (strcmp(name, "fsync@openssh.com") == 0 &&
522 		    strcmp((char *)value, "1") == 0) {
523 			ret->exts |= SFTP_EXT_FSYNC;
524 			known = 1;
525 		} else if (strcmp(name, "lsetstat@openssh.com") == 0 &&
526 		    strcmp((char *)value, "1") == 0) {
527 			ret->exts |= SFTP_EXT_LSETSTAT;
528 			known = 1;
529 		} else if (strcmp(name, "limits@openssh.com") == 0 &&
530 		    strcmp((char *)value, "1") == 0) {
531 			ret->exts |= SFTP_EXT_LIMITS;
532 			known = 1;
533 		} else if (strcmp(name, "expand-path@openssh.com") == 0 &&
534 		    strcmp((char *)value, "1") == 0) {
535 			ret->exts |= SFTP_EXT_PATH_EXPAND;
536 			known = 1;
537 		}
538 		if (known) {
539 			debug2("Server supports extension \"%s\" revision %s",
540 			    name, value);
541 		} else {
542 			debug2("Unrecognised server extension \"%s\"", name);
543 		}
544 		free(name);
545 		free(value);
546 	}
547 
548 	sshbuf_free(msg);
549 
550 	/* Query the server for its limits */
551 	if (ret->exts & SFTP_EXT_LIMITS) {
552 		struct sftp_limits limits;
553 		if (do_limits(ret, &limits) != 0)
554 			fatal_f("limits failed");
555 
556 		/* If the caller did not specify, find a good value */
557 		if (transfer_buflen == 0) {
558 			ret->download_buflen = limits.read_length;
559 			ret->upload_buflen = limits.write_length;
560 			debug("Using server download size %u", ret->download_buflen);
561 			debug("Using server upload size %u", ret->upload_buflen);
562 		}
563 
564 		/* Use the server limit to scale down our value only */
565 		if (num_requests == 0 && limits.open_handles) {
566 			ret->num_requests =
567 			    MINIMUM(DEFAULT_NUM_REQUESTS, limits.open_handles);
568 			debug("Server handle limit %llu; using %u",
569 			    (unsigned long long)limits.open_handles,
570 			    ret->num_requests);
571 		}
572 	}
573 
574 	/* Some filexfer v.0 servers don't support large packets */
575 	if (ret->version == 0) {
576 		ret->download_buflen = MINIMUM(ret->download_buflen, 20480);
577 		ret->upload_buflen = MINIMUM(ret->upload_buflen, 20480);
578 	}
579 
580 	ret->limit_kbps = limit_kbps;
581 	if (ret->limit_kbps > 0) {
582 		bandwidth_limit_init(&ret->bwlimit_in, ret->limit_kbps,
583 		    ret->download_buflen);
584 		bandwidth_limit_init(&ret->bwlimit_out, ret->limit_kbps,
585 		    ret->upload_buflen);
586 	}
587 
588 	return ret;
589 }
590 
591 u_int
592 sftp_proto_version(struct sftp_conn *conn)
593 {
594 	return conn->version;
595 }
596 
597 int
598 do_limits(struct sftp_conn *conn, struct sftp_limits *limits)
599 {
600 	u_int id, msg_id;
601 	u_char type;
602 	struct sshbuf *msg;
603 	int r;
604 
605 	if ((conn->exts & SFTP_EXT_LIMITS) == 0) {
606 		error("Server does not support limits@openssh.com extension");
607 		return -1;
608 	}
609 
610 	if ((msg = sshbuf_new()) == NULL)
611 		fatal_f("sshbuf_new failed");
612 
613 	id = conn->msg_id++;
614 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
615 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
616 	    (r = sshbuf_put_cstring(msg, "limits@openssh.com")) != 0)
617 		fatal_fr(r, "compose");
618 	send_msg(conn, msg);
619 	debug3("Sent message limits@openssh.com I:%u", id);
620 
621 	get_msg(conn, msg);
622 
623 	if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
624 	    (r = sshbuf_get_u32(msg, &msg_id)) != 0)
625 		fatal_fr(r, "parse");
626 
627 	debug3("Received limits reply T:%u I:%u", type, msg_id);
628 	if (id != msg_id)
629 		fatal("ID mismatch (%u != %u)", msg_id, id);
630 	if (type != SSH2_FXP_EXTENDED_REPLY) {
631 		debug_f("expected SSH2_FXP_EXTENDED_REPLY(%u) packet, got %u",
632 		    SSH2_FXP_EXTENDED_REPLY, type);
633 		/* Disable the limits extension */
634 		conn->exts &= ~SFTP_EXT_LIMITS;
635 		sshbuf_free(msg);
636 		return 0;
637 	}
638 
639 	memset(limits, 0, sizeof(*limits));
640 	if ((r = sshbuf_get_u64(msg, &limits->packet_length)) != 0 ||
641 	    (r = sshbuf_get_u64(msg, &limits->read_length)) != 0 ||
642 	    (r = sshbuf_get_u64(msg, &limits->write_length)) != 0 ||
643 	    (r = sshbuf_get_u64(msg, &limits->open_handles)) != 0)
644 		fatal_fr(r, "parse limits");
645 
646 	sshbuf_free(msg);
647 
648 	return 0;
649 }
650 
651 int
652 do_close(struct sftp_conn *conn, const u_char *handle, u_int handle_len)
653 {
654 	u_int id, status;
655 	struct sshbuf *msg;
656 	int r;
657 
658 	if ((msg = sshbuf_new()) == NULL)
659 		fatal_f("sshbuf_new failed");
660 
661 	id = conn->msg_id++;
662 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_CLOSE)) != 0 ||
663 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
664 	    (r = sshbuf_put_string(msg, handle, handle_len)) != 0)
665 		fatal_fr(r, "parse");
666 	send_msg(conn, msg);
667 	debug3("Sent message SSH2_FXP_CLOSE I:%u", id);
668 
669 	status = get_status(conn, id);
670 	if (status != SSH2_FX_OK)
671 		error("Couldn't close file: %s", fx2txt(status));
672 
673 	sshbuf_free(msg);
674 
675 	return status == SSH2_FX_OK ? 0 : -1;
676 }
677 
678 
679 static int
680 do_lsreaddir(struct sftp_conn *conn, const char *path, int print_flag,
681     SFTP_DIRENT ***dir)
682 {
683 	struct sshbuf *msg;
684 	u_int count, id, i, expected_id, ents = 0;
685 	size_t handle_len;
686 	u_char type, *handle;
687 	int status = SSH2_FX_FAILURE;
688 	int r;
689 
690 	if (dir)
691 		*dir = NULL;
692 
693 	id = conn->msg_id++;
694 
695 	if ((msg = sshbuf_new()) == NULL)
696 		fatal_f("sshbuf_new failed");
697 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_OPENDIR)) != 0 ||
698 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
699 	    (r = sshbuf_put_cstring(msg, path)) != 0)
700 		fatal_fr(r, "compose OPENDIR");
701 	send_msg(conn, msg);
702 
703 	handle = get_handle(conn, id, &handle_len,
704 	    "remote readdir(\"%s\")", path);
705 	if (handle == NULL) {
706 		sshbuf_free(msg);
707 		return -1;
708 	}
709 
710 	if (dir) {
711 		ents = 0;
712 		*dir = xcalloc(1, sizeof(**dir));
713 		(*dir)[0] = NULL;
714 	}
715 
716 	for (; !interrupted;) {
717 		id = expected_id = conn->msg_id++;
718 
719 		debug3("Sending SSH2_FXP_READDIR I:%u", id);
720 
721 		sshbuf_reset(msg);
722 		if ((r = sshbuf_put_u8(msg, SSH2_FXP_READDIR)) != 0 ||
723 		    (r = sshbuf_put_u32(msg, id)) != 0 ||
724 		    (r = sshbuf_put_string(msg, handle, handle_len)) != 0)
725 			fatal_fr(r, "compose READDIR");
726 		send_msg(conn, msg);
727 
728 		sshbuf_reset(msg);
729 
730 		get_msg(conn, msg);
731 
732 		if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
733 		    (r = sshbuf_get_u32(msg, &id)) != 0)
734 			fatal_fr(r, "parse");
735 
736 		debug3("Received reply T:%u I:%u", type, id);
737 
738 		if (id != expected_id)
739 			fatal("ID mismatch (%u != %u)", id, expected_id);
740 
741 		if (type == SSH2_FXP_STATUS) {
742 			u_int rstatus;
743 
744 			if ((r = sshbuf_get_u32(msg, &rstatus)) != 0)
745 				fatal_fr(r, "parse status");
746 			debug3("Received SSH2_FXP_STATUS %d", rstatus);
747 			if (rstatus == SSH2_FX_EOF)
748 				break;
749 			error("Couldn't read directory: %s", fx2txt(rstatus));
750 			goto out;
751 		} else if (type != SSH2_FXP_NAME)
752 			fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
753 			    SSH2_FXP_NAME, type);
754 
755 		if ((r = sshbuf_get_u32(msg, &count)) != 0)
756 			fatal_fr(r, "parse count");
757 		if (count > SSHBUF_SIZE_MAX)
758 			fatal_f("nonsensical number of entries");
759 		if (count == 0)
760 			break;
761 		debug3("Received %d SSH2_FXP_NAME responses", count);
762 		for (i = 0; i < count; i++) {
763 			char *filename, *longname;
764 			Attrib a;
765 
766 			if ((r = sshbuf_get_cstring(msg, &filename,
767 			    NULL)) != 0 ||
768 			    (r = sshbuf_get_cstring(msg, &longname,
769 			    NULL)) != 0)
770 				fatal_fr(r, "parse filenames");
771 			if ((r = decode_attrib(msg, &a)) != 0) {
772 				error_fr(r, "couldn't decode attrib");
773 				free(filename);
774 				free(longname);
775 				goto out;
776 			}
777 
778 			if (print_flag)
779 				mprintf("%s\n", longname);
780 
781 			/*
782 			 * Directory entries should never contain '/'
783 			 * These can be used to attack recursive ops
784 			 * (e.g. send '../../../../etc/passwd')
785 			 */
786 			if (strpbrk(filename, SFTP_DIRECTORY_CHARS) != NULL) {
787 				error("Server sent suspect path \"%s\" "
788 				    "during readdir of \"%s\"", filename, path);
789 			} else if (dir) {
790 				*dir = xreallocarray(*dir, ents + 2, sizeof(**dir));
791 				(*dir)[ents] = xcalloc(1, sizeof(***dir));
792 				(*dir)[ents]->filename = xstrdup(filename);
793 				(*dir)[ents]->longname = xstrdup(longname);
794 				memcpy(&(*dir)[ents]->a, &a, sizeof(a));
795 				(*dir)[++ents] = NULL;
796 			}
797 			free(filename);
798 			free(longname);
799 		}
800 	}
801 	status = 0;
802 
803  out:
804 	sshbuf_free(msg);
805 	do_close(conn, handle, handle_len);
806 	free(handle);
807 
808 	if (status != 0 && dir != NULL) {
809 		/* Don't return results on error */
810 		free_sftp_dirents(*dir);
811 		*dir = NULL;
812 	} else if (interrupted && dir != NULL && *dir != NULL) {
813 		/* Don't return partial matches on interrupt */
814 		free_sftp_dirents(*dir);
815 		*dir = xcalloc(1, sizeof(**dir));
816 		**dir = NULL;
817 	}
818 
819 	return status == SSH2_FX_OK ? 0 : -1;
820 }
821 
822 int
823 do_readdir(struct sftp_conn *conn, const char *path, SFTP_DIRENT ***dir)
824 {
825 	return(do_lsreaddir(conn, path, 0, dir));
826 }
827 
828 void free_sftp_dirents(SFTP_DIRENT **s)
829 {
830 	int i;
831 
832 	if (s == NULL)
833 		return;
834 	for (i = 0; s[i]; i++) {
835 		free(s[i]->filename);
836 		free(s[i]->longname);
837 		free(s[i]);
838 	}
839 	free(s);
840 }
841 
842 int
843 do_rm(struct sftp_conn *conn, const char *path)
844 {
845 	u_int status, id;
846 
847 	debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
848 
849 	id = conn->msg_id++;
850 	send_string_request(conn, id, SSH2_FXP_REMOVE, path, strlen(path));
851 	status = get_status(conn, id);
852 	if (status != SSH2_FX_OK)
853 		error("Couldn't delete file: %s", fx2txt(status));
854 	return status == SSH2_FX_OK ? 0 : -1;
855 }
856 
857 int
858 do_mkdir(struct sftp_conn *conn, const char *path, Attrib *a, int print_flag)
859 {
860 	u_int status, id;
861 
862 	id = conn->msg_id++;
863 	send_string_attrs_request(conn, id, SSH2_FXP_MKDIR, path,
864 	    strlen(path), a);
865 
866 	status = get_status(conn, id);
867 	if (status != SSH2_FX_OK && print_flag)
868 		error("Couldn't create directory: %s", fx2txt(status));
869 
870 	return status == SSH2_FX_OK ? 0 : -1;
871 }
872 
873 int
874 do_rmdir(struct sftp_conn *conn, const char *path)
875 {
876 	u_int status, id;
877 
878 	id = conn->msg_id++;
879 	send_string_request(conn, id, SSH2_FXP_RMDIR, path,
880 	    strlen(path));
881 
882 	status = get_status(conn, id);
883 	if (status != SSH2_FX_OK)
884 		error("Couldn't remove directory: %s", fx2txt(status));
885 
886 	return status == SSH2_FX_OK ? 0 : -1;
887 }
888 
889 Attrib *
890 do_stat(struct sftp_conn *conn, const char *path, int quiet)
891 {
892 	u_int id;
893 
894 	id = conn->msg_id++;
895 
896 	send_string_request(conn, id,
897 	    conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT,
898 	    path, strlen(path));
899 
900 	return(get_decode_stat(conn, id, quiet));
901 }
902 
903 Attrib *
904 do_lstat(struct sftp_conn *conn, const char *path, int quiet)
905 {
906 	u_int id;
907 
908 	if (conn->version == 0) {
909 		if (quiet)
910 			debug("Server version does not support lstat operation");
911 		else
912 			logit("Server version does not support lstat operation");
913 		return(do_stat(conn, path, quiet));
914 	}
915 
916 	id = conn->msg_id++;
917 	send_string_request(conn, id, SSH2_FXP_LSTAT, path,
918 	    strlen(path));
919 
920 	return(get_decode_stat(conn, id, quiet));
921 }
922 
923 #ifdef notyet
924 Attrib *
925 do_fstat(struct sftp_conn *conn, const u_char *handle, u_int handle_len,
926     int quiet)
927 {
928 	u_int id;
929 
930 	id = conn->msg_id++;
931 	send_string_request(conn, id, SSH2_FXP_FSTAT, handle,
932 	    handle_len);
933 
934 	return(get_decode_stat(conn, id, quiet));
935 }
936 #endif
937 
938 int
939 do_setstat(struct sftp_conn *conn, const char *path, Attrib *a)
940 {
941 	u_int status, id;
942 
943 	id = conn->msg_id++;
944 	send_string_attrs_request(conn, id, SSH2_FXP_SETSTAT, path,
945 	    strlen(path), a);
946 
947 	status = get_status(conn, id);
948 	if (status != SSH2_FX_OK)
949 		error("Couldn't setstat on \"%s\": %s", path,
950 		    fx2txt(status));
951 
952 	return status == SSH2_FX_OK ? 0 : -1;
953 }
954 
955 int
956 do_fsetstat(struct sftp_conn *conn, const u_char *handle, u_int handle_len,
957     Attrib *a)
958 {
959 	u_int status, id;
960 
961 	id = conn->msg_id++;
962 	send_string_attrs_request(conn, id, SSH2_FXP_FSETSTAT, handle,
963 	    handle_len, a);
964 
965 	status = get_status(conn, id);
966 	if (status != SSH2_FX_OK)
967 		error("Couldn't fsetstat: %s", fx2txt(status));
968 
969 	return status == SSH2_FX_OK ? 0 : -1;
970 }
971 
972 /* Implements both the realpath and expand-path operations */
973 static char *
974 do_realpath_expand(struct sftp_conn *conn, const char *path, int expand)
975 {
976 	struct sshbuf *msg;
977 	u_int expected_id, count, id;
978 	char *filename, *longname;
979 	Attrib a;
980 	u_char type;
981 	int r;
982 	const char *what = "SSH2_FXP_REALPATH";
983 
984 	if (expand)
985 		what = "expand-path@openssh.com";
986 	if ((msg = sshbuf_new()) == NULL)
987 		fatal_f("sshbuf_new failed");
988 
989 	expected_id = id = conn->msg_id++;
990 	if (expand) {
991 		if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
992 		    (r = sshbuf_put_u32(msg, id)) != 0 ||
993 		    (r = sshbuf_put_cstring(msg,
994 		    "expand-path@openssh.com")) != 0 ||
995 		    (r = sshbuf_put_cstring(msg, path)) != 0)
996 			fatal_fr(r, "compose %s", what);
997 		send_msg(conn, msg);
998 	} else {
999 		send_string_request(conn, id, SSH2_FXP_REALPATH,
1000 		    path, strlen(path));
1001 	}
1002 	get_msg(conn, msg);
1003 	if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
1004 	    (r = sshbuf_get_u32(msg, &id)) != 0)
1005 		fatal_fr(r, "parse");
1006 
1007 	if (id != expected_id)
1008 		fatal("ID mismatch (%u != %u)", id, expected_id);
1009 
1010 	if (type == SSH2_FXP_STATUS) {
1011 		u_int status;
1012 
1013 		if ((r = sshbuf_get_u32(msg, &status)) != 0)
1014 			fatal_fr(r, "parse status");
1015 		error("Couldn't canonicalize: %s", fx2txt(status));
1016 		sshbuf_free(msg);
1017 		return NULL;
1018 	} else if (type != SSH2_FXP_NAME)
1019 		fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
1020 		    SSH2_FXP_NAME, type);
1021 
1022 	if ((r = sshbuf_get_u32(msg, &count)) != 0)
1023 		fatal_fr(r, "parse count");
1024 	if (count != 1)
1025 		fatal("Got multiple names (%d) from %s", count, what);
1026 
1027 	if ((r = sshbuf_get_cstring(msg, &filename, NULL)) != 0 ||
1028 	    (r = sshbuf_get_cstring(msg, &longname, NULL)) != 0 ||
1029 	    (r = decode_attrib(msg, &a)) != 0)
1030 		fatal_fr(r, "parse filename/attrib");
1031 
1032 	debug3("%s %s -> %s", what, path, filename);
1033 
1034 	free(longname);
1035 
1036 	sshbuf_free(msg);
1037 
1038 	return(filename);
1039 }
1040 
1041 char *
1042 do_realpath(struct sftp_conn *conn, const char *path)
1043 {
1044 	return do_realpath_expand(conn, path, 0);
1045 }
1046 
1047 int
1048 can_expand_path(struct sftp_conn *conn)
1049 {
1050 	return (conn->exts & SFTP_EXT_PATH_EXPAND) != 0;
1051 }
1052 
1053 char *
1054 do_expand_path(struct sftp_conn *conn, const char *path)
1055 {
1056 	if (!can_expand_path(conn)) {
1057 		debug3_f("no server support, fallback to realpath");
1058 		return do_realpath_expand(conn, path, 0);
1059 	}
1060 	return do_realpath_expand(conn, path, 1);
1061 }
1062 
1063 int
1064 do_rename(struct sftp_conn *conn, const char *oldpath, const char *newpath,
1065     int force_legacy)
1066 {
1067 	struct sshbuf *msg;
1068 	u_int status, id;
1069 	int r, use_ext = (conn->exts & SFTP_EXT_POSIX_RENAME) && !force_legacy;
1070 
1071 	if ((msg = sshbuf_new()) == NULL)
1072 		fatal_f("sshbuf_new failed");
1073 
1074 	/* Send rename request */
1075 	id = conn->msg_id++;
1076 	if (use_ext) {
1077 		if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
1078 		    (r = sshbuf_put_u32(msg, id)) != 0 ||
1079 		    (r = sshbuf_put_cstring(msg,
1080 		    "posix-rename@openssh.com")) != 0)
1081 			fatal_fr(r, "compose posix-rename");
1082 	} else {
1083 		if ((r = sshbuf_put_u8(msg, SSH2_FXP_RENAME)) != 0 ||
1084 		    (r = sshbuf_put_u32(msg, id)) != 0)
1085 			fatal_fr(r, "compose rename");
1086 	}
1087 	if ((r = sshbuf_put_cstring(msg, oldpath)) != 0 ||
1088 	    (r = sshbuf_put_cstring(msg, newpath)) != 0)
1089 		fatal_fr(r, "compose paths");
1090 	send_msg(conn, msg);
1091 	debug3("Sent message %s \"%s\" -> \"%s\"",
1092 	    use_ext ? "posix-rename@openssh.com" :
1093 	    "SSH2_FXP_RENAME", oldpath, newpath);
1094 	sshbuf_free(msg);
1095 
1096 	status = get_status(conn, id);
1097 	if (status != SSH2_FX_OK)
1098 		error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
1099 		    newpath, fx2txt(status));
1100 
1101 	return status == SSH2_FX_OK ? 0 : -1;
1102 }
1103 
1104 int
1105 do_hardlink(struct sftp_conn *conn, const char *oldpath, const char *newpath)
1106 {
1107 	struct sshbuf *msg;
1108 	u_int status, id;
1109 	int r;
1110 
1111 	if ((conn->exts & SFTP_EXT_HARDLINK) == 0) {
1112 		error("Server does not support hardlink@openssh.com extension");
1113 		return -1;
1114 	}
1115 
1116 	if ((msg = sshbuf_new()) == NULL)
1117 		fatal_f("sshbuf_new failed");
1118 
1119 	/* Send link request */
1120 	id = conn->msg_id++;
1121 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
1122 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
1123 	    (r = sshbuf_put_cstring(msg, "hardlink@openssh.com")) != 0 ||
1124 	    (r = sshbuf_put_cstring(msg, oldpath)) != 0 ||
1125 	    (r = sshbuf_put_cstring(msg, newpath)) != 0)
1126 		fatal_fr(r, "compose");
1127 	send_msg(conn, msg);
1128 	debug3("Sent message hardlink@openssh.com \"%s\" -> \"%s\"",
1129 	    oldpath, newpath);
1130 	sshbuf_free(msg);
1131 
1132 	status = get_status(conn, id);
1133 	if (status != SSH2_FX_OK)
1134 		error("Couldn't link file \"%s\" to \"%s\": %s", oldpath,
1135 		    newpath, fx2txt(status));
1136 
1137 	return status == SSH2_FX_OK ? 0 : -1;
1138 }
1139 
1140 int
1141 do_symlink(struct sftp_conn *conn, const char *oldpath, const char *newpath)
1142 {
1143 	struct sshbuf *msg;
1144 	u_int status, id;
1145 	int r;
1146 
1147 	if (conn->version < 3) {
1148 		error("This server does not support the symlink operation");
1149 		return(SSH2_FX_OP_UNSUPPORTED);
1150 	}
1151 
1152 	if ((msg = sshbuf_new()) == NULL)
1153 		fatal_f("sshbuf_new failed");
1154 
1155 	/* Send symlink request */
1156 	id = conn->msg_id++;
1157 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_SYMLINK)) != 0 ||
1158 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
1159 	    (r = sshbuf_put_cstring(msg, oldpath)) != 0 ||
1160 	    (r = sshbuf_put_cstring(msg, newpath)) != 0)
1161 		fatal_fr(r, "compose");
1162 	send_msg(conn, msg);
1163 	debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath,
1164 	    newpath);
1165 	sshbuf_free(msg);
1166 
1167 	status = get_status(conn, id);
1168 	if (status != SSH2_FX_OK)
1169 		error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath,
1170 		    newpath, fx2txt(status));
1171 
1172 	return status == SSH2_FX_OK ? 0 : -1;
1173 }
1174 
1175 int
1176 do_fsync(struct sftp_conn *conn, u_char *handle, u_int handle_len)
1177 {
1178 	struct sshbuf *msg;
1179 	u_int status, id;
1180 	int r;
1181 
1182 	/* Silently return if the extension is not supported */
1183 	if ((conn->exts & SFTP_EXT_FSYNC) == 0)
1184 		return -1;
1185 
1186 	/* Send fsync request */
1187 	if ((msg = sshbuf_new()) == NULL)
1188 		fatal_f("sshbuf_new failed");
1189 	id = conn->msg_id++;
1190 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
1191 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
1192 	    (r = sshbuf_put_cstring(msg, "fsync@openssh.com")) != 0 ||
1193 	    (r = sshbuf_put_string(msg, handle, handle_len)) != 0)
1194 		fatal_fr(r, "compose");
1195 	send_msg(conn, msg);
1196 	debug3("Sent message fsync@openssh.com I:%u", id);
1197 	sshbuf_free(msg);
1198 
1199 	status = get_status(conn, id);
1200 	if (status != SSH2_FX_OK)
1201 		error("Couldn't sync file: %s", fx2txt(status));
1202 
1203 	return status == SSH2_FX_OK ? 0 : -1;
1204 }
1205 
1206 #ifdef notyet
1207 char *
1208 do_readlink(struct sftp_conn *conn, const char *path)
1209 {
1210 	struct sshbuf *msg;
1211 	u_int expected_id, count, id;
1212 	char *filename, *longname;
1213 	Attrib a;
1214 	u_char type;
1215 	int r;
1216 
1217 	expected_id = id = conn->msg_id++;
1218 	send_string_request(conn, id, SSH2_FXP_READLINK, path, strlen(path));
1219 
1220 	if ((msg = sshbuf_new()) == NULL)
1221 		fatal_f("sshbuf_new failed");
1222 
1223 	get_msg(conn, msg);
1224 	if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
1225 	    (r = sshbuf_get_u32(msg, &id)) != 0)
1226 		fatal_fr(r, "parse");
1227 
1228 	if (id != expected_id)
1229 		fatal("ID mismatch (%u != %u)", id, expected_id);
1230 
1231 	if (type == SSH2_FXP_STATUS) {
1232 		u_int status;
1233 
1234 		if ((r = sshbuf_get_u32(msg, &status)) != 0)
1235 			fatal_fr(r, "parse status");
1236 		error("Couldn't readlink: %s", fx2txt(status));
1237 		sshbuf_free(msg);
1238 		return(NULL);
1239 	} else if (type != SSH2_FXP_NAME)
1240 		fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
1241 		    SSH2_FXP_NAME, type);
1242 
1243 	if ((r = sshbuf_get_u32(msg, &count)) != 0)
1244 		fatal_fr(r, "parse count");
1245 	if (count != 1)
1246 		fatal("Got multiple names (%d) from SSH_FXP_READLINK", count);
1247 
1248 	if ((r = sshbuf_get_cstring(msg, &filename, NULL)) != 0 ||
1249 	    (r = sshbuf_get_cstring(msg, &longname, NULL)) != 0 ||
1250 	    (r = decode_attrib(msg, &a)) != 0)
1251 		fatal_fr(r, "parse filenames/attrib");
1252 
1253 	debug3("SSH_FXP_READLINK %s -> %s", path, filename);
1254 
1255 	free(longname);
1256 
1257 	sshbuf_free(msg);
1258 
1259 	return filename;
1260 }
1261 #endif
1262 
1263 int
1264 do_statvfs(struct sftp_conn *conn, const char *path, struct sftp_statvfs *st,
1265     int quiet)
1266 {
1267 	struct sshbuf *msg;
1268 	u_int id;
1269 	int r;
1270 
1271 	if ((conn->exts & SFTP_EXT_STATVFS) == 0) {
1272 		error("Server does not support statvfs@openssh.com extension");
1273 		return -1;
1274 	}
1275 
1276 	id = conn->msg_id++;
1277 
1278 	if ((msg = sshbuf_new()) == NULL)
1279 		fatal_f("sshbuf_new failed");
1280 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
1281 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
1282 	    (r = sshbuf_put_cstring(msg, "statvfs@openssh.com")) != 0 ||
1283 	    (r = sshbuf_put_cstring(msg, path)) != 0)
1284 		fatal_fr(r, "compose");
1285 	send_msg(conn, msg);
1286 	sshbuf_free(msg);
1287 
1288 	return get_decode_statvfs(conn, st, id, quiet);
1289 }
1290 
1291 #ifdef notyet
1292 int
1293 do_fstatvfs(struct sftp_conn *conn, const u_char *handle, u_int handle_len,
1294     struct sftp_statvfs *st, int quiet)
1295 {
1296 	struct sshbuf *msg;
1297 	u_int id;
1298 
1299 	if ((conn->exts & SFTP_EXT_FSTATVFS) == 0) {
1300 		error("Server does not support fstatvfs@openssh.com extension");
1301 		return -1;
1302 	}
1303 
1304 	id = conn->msg_id++;
1305 
1306 	if ((msg = sshbuf_new()) == NULL)
1307 		fatal_f("sshbuf_new failed");
1308 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
1309 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
1310 	    (r = sshbuf_put_cstring(msg, "fstatvfs@openssh.com")) != 0 ||
1311 	    (r = sshbuf_put_string(msg, handle, handle_len)) != 0)
1312 		fatal_fr(r, "compose");
1313 	send_msg(conn, msg);
1314 	sshbuf_free(msg);
1315 
1316 	return get_decode_statvfs(conn, st, id, quiet);
1317 }
1318 #endif
1319 
1320 int
1321 do_lsetstat(struct sftp_conn *conn, const char *path, Attrib *a)
1322 {
1323 	struct sshbuf *msg;
1324 	u_int status, id;
1325 	int r;
1326 
1327 	if ((conn->exts & SFTP_EXT_LSETSTAT) == 0) {
1328 		error("Server does not support lsetstat@openssh.com extension");
1329 		return -1;
1330 	}
1331 
1332 	id = conn->msg_id++;
1333 	if ((msg = sshbuf_new()) == NULL)
1334 		fatal_f("sshbuf_new failed");
1335 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
1336 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
1337 	    (r = sshbuf_put_cstring(msg, "lsetstat@openssh.com")) != 0 ||
1338 	    (r = sshbuf_put_cstring(msg, path)) != 0 ||
1339 	    (r = encode_attrib(msg, a)) != 0)
1340 		fatal_fr(r, "compose");
1341 	send_msg(conn, msg);
1342 	sshbuf_free(msg);
1343 
1344 	status = get_status(conn, id);
1345 	if (status != SSH2_FX_OK)
1346 		error("Couldn't setstat on \"%s\": %s", path,
1347 		    fx2txt(status));
1348 
1349 	return status == SSH2_FX_OK ? 0 : -1;
1350 }
1351 
1352 static void
1353 send_read_request(struct sftp_conn *conn, u_int id, u_int64_t offset,
1354     u_int len, const u_char *handle, u_int handle_len)
1355 {
1356 	struct sshbuf *msg;
1357 	int r;
1358 
1359 	if ((msg = sshbuf_new()) == NULL)
1360 		fatal_f("sshbuf_new failed");
1361 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_READ)) != 0 ||
1362 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
1363 	    (r = sshbuf_put_string(msg, handle, handle_len)) != 0 ||
1364 	    (r = sshbuf_put_u64(msg, offset)) != 0 ||
1365 	    (r = sshbuf_put_u32(msg, len)) != 0)
1366 		fatal_fr(r, "compose");
1367 	send_msg(conn, msg);
1368 	sshbuf_free(msg);
1369 }
1370 
1371 static int
1372 send_open(struct sftp_conn *conn, const char *path, const char *tag,
1373     u_int openmode, Attrib *a, u_char **handlep, size_t *handle_lenp)
1374 {
1375 	Attrib junk;
1376 	u_char *handle;
1377 	size_t handle_len;
1378 	struct sshbuf *msg;
1379 	int r;
1380 	u_int id;
1381 
1382 	*handlep = NULL;
1383 	*handle_lenp = 0;
1384 
1385 	if (a == NULL) {
1386 		attrib_clear(&junk); /* Send empty attributes */
1387 		a = &junk;
1388 	}
1389 	/* Send open request */
1390 	if ((msg = sshbuf_new()) == NULL)
1391 		fatal_f("sshbuf_new failed");
1392 	id = conn->msg_id++;
1393 	if ((r = sshbuf_put_u8(msg, SSH2_FXP_OPEN)) != 0 ||
1394 	    (r = sshbuf_put_u32(msg, id)) != 0 ||
1395 	    (r = sshbuf_put_cstring(msg, path)) != 0 ||
1396 	    (r = sshbuf_put_u32(msg, openmode)) != 0 ||
1397 	    (r = encode_attrib(msg, a)) != 0)
1398 		fatal_fr(r, "compose %s open", tag);
1399 	send_msg(conn, msg);
1400 	sshbuf_free(msg);
1401 	debug3("Sent %s message SSH2_FXP_OPEN I:%u P:%s M:0x%04x",
1402 	    tag, id, path, openmode);
1403 	if ((handle = get_handle(conn, id, &handle_len,
1404 	    "%s open(\"%s\")", tag, path)) == NULL)
1405 		return -1;
1406 	/* success */
1407 	*handlep = handle;
1408 	*handle_lenp = handle_len;
1409 	return 0;
1410 }
1411 
1412 static const char *
1413 progress_meter_path(const char *path)
1414 {
1415 	const char *progresspath;
1416 
1417 	if ((progresspath = strrchr(path, '/')) == NULL)
1418 		return path;
1419 	progresspath++;
1420 	if (*progresspath == '\0')
1421 		return path;
1422 	return progresspath;
1423 }
1424 
1425 int
1426 do_download(struct sftp_conn *conn, const char *remote_path,
1427     const char *local_path, Attrib *a, int preserve_flag, int resume_flag,
1428     int fsync_flag)
1429 {
1430 	struct sshbuf *msg;
1431 	u_char *handle;
1432 	int local_fd = -1, write_error;
1433 	int read_error, write_errno, lmodified = 0, reordered = 0, r;
1434 	u_int64_t offset = 0, size, highwater;
1435 	u_int mode, id, buflen, num_req, max_req, status = SSH2_FX_OK;
1436 	off_t progress_counter;
1437 	size_t handle_len;
1438 	struct stat st;
1439 	struct requests requests;
1440 	struct request *req;
1441 	u_char type;
1442 
1443 	TAILQ_INIT(&requests);
1444 
1445 	if (a == NULL && (a = do_stat(conn, remote_path, 0)) == NULL)
1446 		return -1;
1447 
1448 	/* Do not preserve set[ug]id here, as we do not preserve ownership */
1449 	if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
1450 		mode = a->perm & 0777;
1451 	else
1452 		mode = 0666;
1453 
1454 	if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
1455 	    (!S_ISREG(a->perm))) {
1456 		error("Cannot download non-regular file: %s", remote_path);
1457 		return(-1);
1458 	}
1459 
1460 	if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
1461 		size = a->size;
1462 	else
1463 		size = 0;
1464 
1465 	buflen = conn->download_buflen;
1466 
1467 	/* Send open request */
1468 	if (send_open(conn, remote_path, "remote", SSH2_FXF_READ, NULL,
1469 	    &handle, &handle_len) != 0)
1470 		return -1;
1471 
1472 	local_fd = open(local_path,
1473 	    O_WRONLY | O_CREAT | (resume_flag ? 0 : O_TRUNC), mode | S_IWUSR);
1474 	if (local_fd == -1) {
1475 		error("Couldn't open local file \"%s\" for writing: %s",
1476 		    local_path, strerror(errno));
1477 		goto fail;
1478 	}
1479 	offset = highwater = 0;
1480 	if (resume_flag) {
1481 		if (fstat(local_fd, &st) == -1) {
1482 			error("Unable to stat local file \"%s\": %s",
1483 			    local_path, strerror(errno));
1484 			goto fail;
1485 		}
1486 		if (st.st_size < 0) {
1487 			error("\"%s\" has negative size", local_path);
1488 			goto fail;
1489 		}
1490 		if ((u_int64_t)st.st_size > size) {
1491 			error("Unable to resume download of \"%s\": "
1492 			    "local file is larger than remote", local_path);
1493  fail:
1494 			do_close(conn, handle, handle_len);
1495 			free(handle);
1496 			if (local_fd != -1)
1497 				close(local_fd);
1498 			return -1;
1499 		}
1500 		offset = highwater = st.st_size;
1501 	}
1502 
1503 	/* Read from remote and write to local */
1504 	write_error = read_error = write_errno = num_req = 0;
1505 	max_req = 1;
1506 	progress_counter = offset;
1507 
1508 	if (showprogress && size != 0) {
1509 		start_progress_meter(progress_meter_path(remote_path),
1510 		    size, &progress_counter);
1511 	}
1512 
1513 	if ((msg = sshbuf_new()) == NULL)
1514 		fatal_f("sshbuf_new failed");
1515 
1516 	while (num_req > 0 || max_req > 0) {
1517 		u_char *data;
1518 		size_t len;
1519 
1520 		/*
1521 		 * Simulate EOF on interrupt: stop sending new requests and
1522 		 * allow outstanding requests to drain gracefully
1523 		 */
1524 		if (interrupted) {
1525 			if (num_req == 0) /* If we haven't started yet... */
1526 				break;
1527 			max_req = 0;
1528 		}
1529 
1530 		/* Send some more requests */
1531 		while (num_req < max_req) {
1532 			debug3("Request range %llu -> %llu (%d/%d)",
1533 			    (unsigned long long)offset,
1534 			    (unsigned long long)offset + buflen - 1,
1535 			    num_req, max_req);
1536 			req = request_enqueue(&requests, conn->msg_id++,
1537 			    buflen, offset);
1538 			offset += buflen;
1539 			num_req++;
1540 			send_read_request(conn, req->id, req->offset,
1541 			    req->len, handle, handle_len);
1542 		}
1543 
1544 		sshbuf_reset(msg);
1545 		get_msg(conn, msg);
1546 		if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
1547 		    (r = sshbuf_get_u32(msg, &id)) != 0)
1548 			fatal_fr(r, "parse");
1549 		debug3("Received reply T:%u I:%u R:%d", type, id, max_req);
1550 
1551 		/* Find the request in our queue */
1552 		if ((req = request_find(&requests, id)) == NULL)
1553 			fatal("Unexpected reply %u", id);
1554 
1555 		switch (type) {
1556 		case SSH2_FXP_STATUS:
1557 			if ((r = sshbuf_get_u32(msg, &status)) != 0)
1558 				fatal_fr(r, "parse status");
1559 			if (status != SSH2_FX_EOF)
1560 				read_error = 1;
1561 			max_req = 0;
1562 			TAILQ_REMOVE(&requests, req, tq);
1563 			free(req);
1564 			num_req--;
1565 			break;
1566 		case SSH2_FXP_DATA:
1567 			if ((r = sshbuf_get_string(msg, &data, &len)) != 0)
1568 				fatal_fr(r, "parse data");
1569 			debug3("Received data %llu -> %llu",
1570 			    (unsigned long long)req->offset,
1571 			    (unsigned long long)req->offset + len - 1);
1572 			if (len > req->len)
1573 				fatal("Received more data than asked for "
1574 				    "%zu > %zu", len, req->len);
1575 			lmodified = 1;
1576 			if ((lseek(local_fd, req->offset, SEEK_SET) == -1 ||
1577 			    atomicio(vwrite, local_fd, data, len) != len) &&
1578 			    !write_error) {
1579 				write_errno = errno;
1580 				write_error = 1;
1581 				max_req = 0;
1582 			}
1583 			else if (!reordered && req->offset <= highwater)
1584 				highwater = req->offset + len;
1585 			else if (!reordered && req->offset > highwater)
1586 				reordered = 1;
1587 			progress_counter += len;
1588 			free(data);
1589 
1590 			if (len == req->len) {
1591 				TAILQ_REMOVE(&requests, req, tq);
1592 				free(req);
1593 				num_req--;
1594 			} else {
1595 				/* Resend the request for the missing data */
1596 				debug3("Short data block, re-requesting "
1597 				    "%llu -> %llu (%2d)",
1598 				    (unsigned long long)req->offset + len,
1599 				    (unsigned long long)req->offset +
1600 				    req->len - 1, num_req);
1601 				req->id = conn->msg_id++;
1602 				req->len -= len;
1603 				req->offset += len;
1604 				send_read_request(conn, req->id,
1605 				    req->offset, req->len, handle, handle_len);
1606 				/* Reduce the request size */
1607 				if (len < buflen)
1608 					buflen = MAXIMUM(MIN_READ_SIZE, len);
1609 			}
1610 			if (max_req > 0) { /* max_req = 0 iff EOF received */
1611 				if (size > 0 && offset > size) {
1612 					/* Only one request at a time
1613 					 * after the expected EOF */
1614 					debug3("Finish at %llu (%2d)",
1615 					    (unsigned long long)offset,
1616 					    num_req);
1617 					max_req = 1;
1618 				} else if (max_req < conn->num_requests) {
1619 					++max_req;
1620 				}
1621 			}
1622 			break;
1623 		default:
1624 			fatal("Expected SSH2_FXP_DATA(%u) packet, got %u",
1625 			    SSH2_FXP_DATA, type);
1626 		}
1627 	}
1628 
1629 	if (showprogress && size)
1630 		stop_progress_meter();
1631 
1632 	/* Sanity check */
1633 	if (TAILQ_FIRST(&requests) != NULL)
1634 		fatal("Transfer complete, but requests still in queue");
1635 	/* Truncate at highest contiguous point to avoid holes on interrupt */
1636 	if (read_error || write_error || interrupted) {
1637 		if (reordered && resume_flag) {
1638 			error("Unable to resume download of \"%s\": "
1639 			    "server reordered requests", local_path);
1640 		}
1641 		debug("truncating at %llu", (unsigned long long)highwater);
1642 		if (ftruncate(local_fd, highwater) == -1)
1643 			error("ftruncate \"%s\": %s", local_path,
1644 			    strerror(errno));
1645 	}
1646 	if (read_error) {
1647 		error("Couldn't read from remote file \"%s\" : %s",
1648 		    remote_path, fx2txt(status));
1649 		status = -1;
1650 		do_close(conn, handle, handle_len);
1651 	} else if (write_error) {
1652 		error("Couldn't write to \"%s\": %s", local_path,
1653 		    strerror(write_errno));
1654 		status = SSH2_FX_FAILURE;
1655 		do_close(conn, handle, handle_len);
1656 	} else {
1657 		if (do_close(conn, handle, handle_len) != 0 || interrupted)
1658 			status = SSH2_FX_FAILURE;
1659 		else
1660 			status = SSH2_FX_OK;
1661 		/* Override umask and utimes if asked */
1662 #ifdef HAVE_FCHMOD
1663 		if (preserve_flag && fchmod(local_fd, mode) == -1)
1664 #else
1665 		if (preserve_flag && chmod(local_path, mode) == -1)
1666 #endif /* HAVE_FCHMOD */
1667 			error("Couldn't set mode on \"%s\": %s", local_path,
1668 			    strerror(errno));
1669 		if (preserve_flag &&
1670 		    (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) {
1671 			struct timeval tv[2];
1672 			tv[0].tv_sec = a->atime;
1673 			tv[1].tv_sec = a->mtime;
1674 			tv[0].tv_usec = tv[1].tv_usec = 0;
1675 			if (utimes(local_path, tv) == -1)
1676 				error("Can't set times on \"%s\": %s",
1677 				    local_path, strerror(errno));
1678 		}
1679 		if (resume_flag && !lmodified)
1680 			logit("File \"%s\" was not modified", local_path);
1681 		else if (fsync_flag) {
1682 			debug("syncing \"%s\"", local_path);
1683 			if (fsync(local_fd) == -1)
1684 				error("Couldn't sync file \"%s\": %s",
1685 				    local_path, strerror(errno));
1686 		}
1687 	}
1688 	close(local_fd);
1689 	sshbuf_free(msg);
1690 	free(handle);
1691 
1692 	return status == SSH2_FX_OK ? 0 : -1;
1693 }
1694 
1695 static int
1696 download_dir_internal(struct sftp_conn *conn, const char *src, const char *dst,
1697     int depth, Attrib *dirattrib, int preserve_flag, int print_flag,
1698     int resume_flag, int fsync_flag, int follow_link_flag)
1699 {
1700 	int i, ret = 0;
1701 	SFTP_DIRENT **dir_entries;
1702 	char *filename, *new_src = NULL, *new_dst = NULL;
1703 	mode_t mode = 0777, tmpmode = mode;
1704 
1705 	if (depth >= MAX_DIR_DEPTH) {
1706 		error("Maximum directory depth exceeded: %d levels", depth);
1707 		return -1;
1708 	}
1709 
1710 	if (dirattrib == NULL &&
1711 	    (dirattrib = do_stat(conn, src, 1)) == NULL) {
1712 		error("Unable to stat remote directory \"%s\"", src);
1713 		return -1;
1714 	}
1715 	if (!S_ISDIR(dirattrib->perm)) {
1716 		error("\"%s\" is not a directory", src);
1717 		return -1;
1718 	}
1719 	if (print_flag && print_flag != SFTP_PROGRESS_ONLY)
1720 		mprintf("Retrieving %s\n", src);
1721 
1722 	if (dirattrib->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1723 		mode = dirattrib->perm & 01777;
1724 		tmpmode = mode | (S_IWUSR|S_IXUSR);
1725 	} else {
1726 		debug("Server did not send permissions for "
1727 		    "directory \"%s\"", dst);
1728 	}
1729 
1730 	if (mkdir(dst, tmpmode) == -1 && errno != EEXIST) {
1731 		error("mkdir %s: %s", dst, strerror(errno));
1732 		return -1;
1733 	}
1734 
1735 	if (do_readdir(conn, src, &dir_entries) == -1) {
1736 		error("%s: Failed to get directory contents", src);
1737 		return -1;
1738 	}
1739 
1740 	for (i = 0; dir_entries[i] != NULL && !interrupted; i++) {
1741 		free(new_dst);
1742 		free(new_src);
1743 
1744 		filename = dir_entries[i]->filename;
1745 		new_dst = path_append(dst, filename);
1746 		new_src = path_append(src, filename);
1747 
1748 		if (S_ISDIR(dir_entries[i]->a.perm)) {
1749 			if (strcmp(filename, ".") == 0 ||
1750 			    strcmp(filename, "..") == 0)
1751 				continue;
1752 			if (download_dir_internal(conn, new_src, new_dst,
1753 			    depth + 1, &(dir_entries[i]->a), preserve_flag,
1754 			    print_flag, resume_flag,
1755 			    fsync_flag, follow_link_flag) == -1)
1756 				ret = -1;
1757 		} else if (S_ISREG(dir_entries[i]->a.perm) ||
1758 		    (follow_link_flag && S_ISLNK(dir_entries[i]->a.perm))) {
1759 			/*
1760 			 * If this is a symlink then don't send the link's
1761 			 * Attrib. do_download() will do a FXP_STAT operation
1762 			 * and get the link target's attributes.
1763 			 */
1764 			if (do_download(conn, new_src, new_dst,
1765 			    S_ISLNK(dir_entries[i]->a.perm) ? NULL :
1766 			    &(dir_entries[i]->a),
1767 			    preserve_flag, resume_flag, fsync_flag) == -1) {
1768 				error("Download of file %s to %s failed",
1769 				    new_src, new_dst);
1770 				ret = -1;
1771 			}
1772 		} else
1773 			logit("%s: not a regular file\n", new_src);
1774 
1775 	}
1776 	free(new_dst);
1777 	free(new_src);
1778 
1779 	if (preserve_flag) {
1780 		if (dirattrib->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1781 			struct timeval tv[2];
1782 			tv[0].tv_sec = dirattrib->atime;
1783 			tv[1].tv_sec = dirattrib->mtime;
1784 			tv[0].tv_usec = tv[1].tv_usec = 0;
1785 			if (utimes(dst, tv) == -1)
1786 				error("Can't set times on \"%s\": %s",
1787 				    dst, strerror(errno));
1788 		} else
1789 			debug("Server did not send times for directory "
1790 			    "\"%s\"", dst);
1791 	}
1792 
1793 	if (mode != tmpmode && chmod(dst, mode) == -1)
1794 		error("Can't set final mode on \"%s\": %s", dst,
1795 		    strerror(errno));
1796 
1797 	free_sftp_dirents(dir_entries);
1798 
1799 	return ret;
1800 }
1801 
1802 int
1803 download_dir(struct sftp_conn *conn, const char *src, const char *dst,
1804     Attrib *dirattrib, int preserve_flag, int print_flag, int resume_flag,
1805     int fsync_flag, int follow_link_flag)
1806 {
1807 	char *src_canon;
1808 	int ret;
1809 
1810 	if ((src_canon = do_realpath(conn, src)) == NULL) {
1811 		error("Unable to canonicalize path \"%s\"", src);
1812 		return -1;
1813 	}
1814 
1815 	ret = download_dir_internal(conn, src_canon, dst, 0,
1816 	    dirattrib, preserve_flag, print_flag, resume_flag, fsync_flag,
1817 	    follow_link_flag);
1818 	free(src_canon);
1819 	return ret;
1820 }
1821 
1822 int
1823 do_upload(struct sftp_conn *conn, const char *local_path,
1824     const char *remote_path, int preserve_flag, int resume, int fsync_flag)
1825 {
1826 	int r, local_fd;
1827 	u_int status = SSH2_FX_OK;
1828 	u_int id;
1829 	u_char type;
1830 	off_t offset, progress_counter;
1831 	u_char *handle, *data;
1832 	struct sshbuf *msg;
1833 	struct stat sb;
1834 	Attrib a, *c = NULL;
1835 	u_int32_t startid;
1836 	u_int32_t ackid;
1837 	struct request *ack = NULL;
1838 	struct requests acks;
1839 	size_t handle_len;
1840 
1841 	TAILQ_INIT(&acks);
1842 
1843 	if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) {
1844 		error("Couldn't open local file \"%s\" for reading: %s",
1845 		    local_path, strerror(errno));
1846 		return(-1);
1847 	}
1848 	if (fstat(local_fd, &sb) == -1) {
1849 		error("Couldn't fstat local file \"%s\": %s",
1850 		    local_path, strerror(errno));
1851 		close(local_fd);
1852 		return(-1);
1853 	}
1854 	if (!S_ISREG(sb.st_mode)) {
1855 		error("%s is not a regular file", local_path);
1856 		close(local_fd);
1857 		return(-1);
1858 	}
1859 	stat_to_attrib(&sb, &a);
1860 
1861 	a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
1862 	a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
1863 	a.perm &= 0777;
1864 	if (!preserve_flag)
1865 		a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
1866 
1867 	if (resume) {
1868 		/* Get remote file size if it exists */
1869 		if ((c = do_stat(conn, remote_path, 0)) == NULL) {
1870 			close(local_fd);
1871 			return -1;
1872 		}
1873 
1874 		if ((off_t)c->size >= sb.st_size) {
1875 			error("destination file bigger or same size as "
1876 			    "source file");
1877 			close(local_fd);
1878 			return -1;
1879 		}
1880 
1881 		if (lseek(local_fd, (off_t)c->size, SEEK_SET) == -1) {
1882 			close(local_fd);
1883 			return -1;
1884 		}
1885 	}
1886 
1887 	/* Send open request */
1888 	if (send_open(conn, remote_path, "dest", SSH2_FXF_WRITE|SSH2_FXF_CREAT|
1889 	    (resume ? SSH2_FXF_APPEND : SSH2_FXF_TRUNC),
1890 	    &a, &handle, &handle_len) != 0) {
1891 		close(local_fd);
1892 		return -1;
1893 	}
1894 
1895 	id = conn->msg_id;
1896 	startid = ackid = id + 1;
1897 	data = xmalloc(conn->upload_buflen);
1898 
1899 	/* Read from local and write to remote */
1900 	offset = progress_counter = (resume ? c->size : 0);
1901 	if (showprogress) {
1902 		start_progress_meter(progress_meter_path(local_path),
1903 		    sb.st_size, &progress_counter);
1904 	}
1905 
1906 	if ((msg = sshbuf_new()) == NULL)
1907 		fatal_f("sshbuf_new failed");
1908 	for (;;) {
1909 		int len;
1910 
1911 		/*
1912 		 * Can't use atomicio here because it returns 0 on EOF,
1913 		 * thus losing the last block of the file.
1914 		 * Simulate an EOF on interrupt, allowing ACKs from the
1915 		 * server to drain.
1916 		 */
1917 		if (interrupted || status != SSH2_FX_OK)
1918 			len = 0;
1919 		else do
1920 			len = read(local_fd, data, conn->upload_buflen);
1921 		while ((len == -1) &&
1922 		    (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
1923 
1924 		if (len == -1)
1925 			fatal("Couldn't read from \"%s\": %s", local_path,
1926 			    strerror(errno));
1927 
1928 		if (len != 0) {
1929 			ack = request_enqueue(&acks, ++id, len, offset);
1930 			sshbuf_reset(msg);
1931 			if ((r = sshbuf_put_u8(msg, SSH2_FXP_WRITE)) != 0 ||
1932 			    (r = sshbuf_put_u32(msg, ack->id)) != 0 ||
1933 			    (r = sshbuf_put_string(msg, handle,
1934 			    handle_len)) != 0 ||
1935 			    (r = sshbuf_put_u64(msg, offset)) != 0 ||
1936 			    (r = sshbuf_put_string(msg, data, len)) != 0)
1937 				fatal_fr(r, "compose");
1938 			send_msg(conn, msg);
1939 			debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u",
1940 			    id, (unsigned long long)offset, len);
1941 		} else if (TAILQ_FIRST(&acks) == NULL)
1942 			break;
1943 
1944 		if (ack == NULL)
1945 			fatal("Unexpected ACK %u", id);
1946 
1947 		if (id == startid || len == 0 ||
1948 		    id - ackid >= conn->num_requests) {
1949 			u_int rid;
1950 
1951 			sshbuf_reset(msg);
1952 			get_msg(conn, msg);
1953 			if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
1954 			    (r = sshbuf_get_u32(msg, &rid)) != 0)
1955 				fatal_fr(r, "parse");
1956 
1957 			if (type != SSH2_FXP_STATUS)
1958 				fatal("Expected SSH2_FXP_STATUS(%d) packet, "
1959 				    "got %d", SSH2_FXP_STATUS, type);
1960 
1961 			if ((r = sshbuf_get_u32(msg, &status)) != 0)
1962 				fatal_fr(r, "parse status");
1963 			debug3("SSH2_FXP_STATUS %u", status);
1964 
1965 			/* Find the request in our queue */
1966 			if ((ack = request_find(&acks, rid)) == NULL)
1967 				fatal("Can't find request for ID %u", rid);
1968 			TAILQ_REMOVE(&acks, ack, tq);
1969 			debug3("In write loop, ack for %u %zu bytes at %lld",
1970 			    ack->id, ack->len, (unsigned long long)ack->offset);
1971 			++ackid;
1972 			progress_counter += ack->len;
1973 			free(ack);
1974 		}
1975 		offset += len;
1976 		if (offset < 0)
1977 			fatal_f("offset < 0");
1978 	}
1979 	sshbuf_free(msg);
1980 
1981 	if (showprogress)
1982 		stop_progress_meter();
1983 	free(data);
1984 
1985 	if (status != SSH2_FX_OK) {
1986 		error("Couldn't write to remote file \"%s\": %s",
1987 		    remote_path, fx2txt(status));
1988 		status = SSH2_FX_FAILURE;
1989 	}
1990 
1991 	if (close(local_fd) == -1) {
1992 		error("Couldn't close local file \"%s\": %s", local_path,
1993 		    strerror(errno));
1994 		status = SSH2_FX_FAILURE;
1995 	}
1996 
1997 	/* Override umask and utimes if asked */
1998 	if (preserve_flag)
1999 		do_fsetstat(conn, handle, handle_len, &a);
2000 
2001 	if (fsync_flag)
2002 		(void)do_fsync(conn, handle, handle_len);
2003 
2004 	if (do_close(conn, handle, handle_len) != 0)
2005 		status = SSH2_FX_FAILURE;
2006 
2007 	free(handle);
2008 
2009 	return status == SSH2_FX_OK ? 0 : -1;
2010 }
2011 
2012 static int
2013 upload_dir_internal(struct sftp_conn *conn, const char *src, const char *dst,
2014     int depth, int preserve_flag, int print_flag, int resume, int fsync_flag,
2015     int follow_link_flag)
2016 {
2017 	int ret = 0;
2018 	DIR *dirp;
2019 	struct dirent *dp;
2020 	char *filename, *new_src = NULL, *new_dst = NULL;
2021 	struct stat sb;
2022 	Attrib a, *dirattrib;
2023 	u_int32_t saved_perm;
2024 
2025 	if (depth >= MAX_DIR_DEPTH) {
2026 		error("Maximum directory depth exceeded: %d levels", depth);
2027 		return -1;
2028 	}
2029 
2030 	if (stat(src, &sb) == -1) {
2031 		error("Couldn't stat directory \"%s\": %s",
2032 		    src, strerror(errno));
2033 		return -1;
2034 	}
2035 	if (!S_ISDIR(sb.st_mode)) {
2036 		error("\"%s\" is not a directory", src);
2037 		return -1;
2038 	}
2039 	if (print_flag && print_flag != SFTP_PROGRESS_ONLY)
2040 		mprintf("Entering %s\n", src);
2041 
2042 	attrib_clear(&a);
2043 	stat_to_attrib(&sb, &a);
2044 	a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
2045 	a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
2046 	a.perm &= 01777;
2047 	if (!preserve_flag)
2048 		a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
2049 
2050 	/*
2051 	 * sftp lacks a portable status value to match errno EEXIST,
2052 	 * so if we get a failure back then we must check whether
2053 	 * the path already existed and is a directory.  Ensure we can
2054 	 * write to the directory we create for the duration of the transfer.
2055 	 */
2056 	saved_perm = a.perm;
2057 	a.perm |= (S_IWUSR|S_IXUSR);
2058 	if (do_mkdir(conn, dst, &a, 0) != 0) {
2059 		if ((dirattrib = do_stat(conn, dst, 0)) == NULL)
2060 			return -1;
2061 		if (!S_ISDIR(dirattrib->perm)) {
2062 			error("\"%s\" exists but is not a directory", dst);
2063 			return -1;
2064 		}
2065 	}
2066 	a.perm = saved_perm;
2067 
2068 	if ((dirp = opendir(src)) == NULL) {
2069 		error("Failed to open dir \"%s\": %s", src, strerror(errno));
2070 		return -1;
2071 	}
2072 
2073 	while (((dp = readdir(dirp)) != NULL) && !interrupted) {
2074 		if (dp->d_ino == 0)
2075 			continue;
2076 		free(new_dst);
2077 		free(new_src);
2078 		filename = dp->d_name;
2079 		new_dst = path_append(dst, filename);
2080 		new_src = path_append(src, filename);
2081 
2082 		if (lstat(new_src, &sb) == -1) {
2083 			logit("%s: lstat failed: %s", filename,
2084 			    strerror(errno));
2085 			ret = -1;
2086 		} else if (S_ISDIR(sb.st_mode)) {
2087 			if (strcmp(filename, ".") == 0 ||
2088 			    strcmp(filename, "..") == 0)
2089 				continue;
2090 
2091 			if (upload_dir_internal(conn, new_src, new_dst,
2092 			    depth + 1, preserve_flag, print_flag, resume,
2093 			    fsync_flag, follow_link_flag) == -1)
2094 				ret = -1;
2095 		} else if (S_ISREG(sb.st_mode) ||
2096 		    (follow_link_flag && S_ISLNK(sb.st_mode))) {
2097 			if (do_upload(conn, new_src, new_dst,
2098 			    preserve_flag, resume, fsync_flag) == -1) {
2099 				error("Uploading of file %s to %s failed!",
2100 				    new_src, new_dst);
2101 				ret = -1;
2102 			}
2103 		} else
2104 			logit("%s: not a regular file\n", filename);
2105 	}
2106 	free(new_dst);
2107 	free(new_src);
2108 
2109 	do_setstat(conn, dst, &a);
2110 
2111 	(void) closedir(dirp);
2112 	return ret;
2113 }
2114 
2115 int
2116 upload_dir(struct sftp_conn *conn, const char *src, const char *dst,
2117     int preserve_flag, int print_flag, int resume, int fsync_flag,
2118     int follow_link_flag)
2119 {
2120 	char *dst_canon;
2121 	int ret;
2122 
2123 	if ((dst_canon = do_realpath(conn, dst)) == NULL) {
2124 		error("Unable to canonicalize path \"%s\"", dst);
2125 		return -1;
2126 	}
2127 
2128 	ret = upload_dir_internal(conn, src, dst_canon, 0, preserve_flag,
2129 	    print_flag, resume, fsync_flag, follow_link_flag);
2130 
2131 	free(dst_canon);
2132 	return ret;
2133 }
2134 
2135 static void
2136 handle_dest_replies(struct sftp_conn *to, const char *to_path, int synchronous,
2137     u_int *nreqsp, u_int *write_errorp)
2138 {
2139 	struct sshbuf *msg;
2140 	u_char type;
2141 	u_int id, status;
2142 	int r;
2143 	struct pollfd pfd;
2144 
2145 	if ((msg = sshbuf_new()) == NULL)
2146 		fatal_f("sshbuf_new failed");
2147 
2148 	/* Try to eat replies from the upload side */
2149 	while (*nreqsp > 0) {
2150 		debug3_f("%u outstanding replies", *nreqsp);
2151 		if (!synchronous) {
2152 			/* Bail out if no data is ready to be read */
2153 			pfd.fd = to->fd_in;
2154 			pfd.events = POLLIN;
2155 			if ((r = poll(&pfd, 1, 0)) == -1) {
2156 				if (errno == EINTR)
2157 					break;
2158 				fatal_f("poll: %s", strerror(errno));
2159 			} else if (r == 0)
2160 				break; /* fd not ready */
2161 		}
2162 		sshbuf_reset(msg);
2163 		get_msg(to, msg);
2164 
2165 		if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
2166 		    (r = sshbuf_get_u32(msg, &id)) != 0)
2167 			fatal_fr(r, "dest parse");
2168 		debug3("Received dest reply T:%u I:%u R:%u", type, id, *nreqsp);
2169 		if (type != SSH2_FXP_STATUS) {
2170 			fatal_f("Expected SSH2_FXP_STATUS(%d) packet, got %d",
2171 			    SSH2_FXP_STATUS, type);
2172 		}
2173 		if ((r = sshbuf_get_u32(msg, &status)) != 0)
2174 			fatal_fr(r, "parse dest status");
2175 		debug3("dest SSH2_FXP_STATUS %u", status);
2176 		if (status != SSH2_FX_OK) {
2177 			/* record first error */
2178 			if (*write_errorp == 0)
2179 				*write_errorp = status;
2180 		}
2181 		/*
2182 		 * XXX this doesn't do full reply matching like do_upload and
2183 		 * so cannot gracefully truncate terminated uploads at a
2184 		 * high-water mark. ATM the only caller of this function (scp)
2185 		 * doesn't support transfer resumption, so this doesn't matter
2186 		 * a whole lot.
2187 		 *
2188 		 * To be safe, do_crossload truncates the destination file to
2189 		 * zero length on upload failure, since we can't trust the
2190 		 * server not to have reordered replies that could have
2191 		 * inserted holes where none existed in the source file.
2192 		 *
2193 		 * XXX we could get a more accutate progress bar if we updated
2194 		 * the counter based on the reply from the destination...
2195 		 */
2196 		(*nreqsp)--;
2197 	}
2198 	debug3_f("done: %u outstanding replies", *nreqsp);
2199 }
2200 
2201 int
2202 do_crossload(struct sftp_conn *from, struct sftp_conn *to,
2203     const char *from_path, const char *to_path,
2204     Attrib *a, int preserve_flag)
2205 {
2206 	struct sshbuf *msg;
2207 	int write_error, read_error, r;
2208 	u_int64_t offset = 0, size;
2209 	u_int id, buflen, num_req, max_req, status = SSH2_FX_OK;
2210 	u_int num_upload_req;
2211 	off_t progress_counter;
2212 	u_char *from_handle, *to_handle;
2213 	size_t from_handle_len, to_handle_len;
2214 	struct requests requests;
2215 	struct request *req;
2216 	u_char type;
2217 
2218 	TAILQ_INIT(&requests);
2219 
2220 	if (a == NULL && (a = do_stat(from, from_path, 0)) == NULL)
2221 		return -1;
2222 
2223 	if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
2224 	    (!S_ISREG(a->perm))) {
2225 		error("Cannot download non-regular file: %s", from_path);
2226 		return(-1);
2227 	}
2228 	if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
2229 		size = a->size;
2230 	else
2231 		size = 0;
2232 
2233 	buflen = from->download_buflen;
2234 	if (buflen > to->upload_buflen)
2235 		buflen = to->upload_buflen;
2236 
2237 	/* Send open request to read side */
2238 	if (send_open(from, from_path, "origin", SSH2_FXF_READ, NULL,
2239 	    &from_handle, &from_handle_len) != 0)
2240 		return -1;
2241 
2242 	/* Send open request to write side */
2243 	a->flags &= ~SSH2_FILEXFER_ATTR_SIZE;
2244 	a->flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
2245 	a->perm &= 0777;
2246 	if (!preserve_flag)
2247 		a->flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
2248 	if (send_open(to, to_path, "dest",
2249 	    SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC, a,
2250 	    &to_handle, &to_handle_len) != 0) {
2251 		do_close(from, from_handle, from_handle_len);
2252 		return -1;
2253 	}
2254 
2255 	/* Read from remote "from" and write to remote "to" */
2256 	offset = 0;
2257 	write_error = read_error = num_req = num_upload_req = 0;
2258 	max_req = 1;
2259 	progress_counter = 0;
2260 
2261 	if (showprogress && size != 0) {
2262 		start_progress_meter(progress_meter_path(from_path),
2263 		    size, &progress_counter);
2264 	}
2265 	if ((msg = sshbuf_new()) == NULL)
2266 		fatal_f("sshbuf_new failed");
2267 	while (num_req > 0 || max_req > 0) {
2268 		u_char *data;
2269 		size_t len;
2270 
2271 		/*
2272 		 * Simulate EOF on interrupt: stop sending new requests and
2273 		 * allow outstanding requests to drain gracefully
2274 		 */
2275 		if (interrupted) {
2276 			if (num_req == 0) /* If we haven't started yet... */
2277 				break;
2278 			max_req = 0;
2279 		}
2280 
2281 		/* Send some more requests */
2282 		while (num_req < max_req) {
2283 			debug3("Request range %llu -> %llu (%d/%d)",
2284 			    (unsigned long long)offset,
2285 			    (unsigned long long)offset + buflen - 1,
2286 			    num_req, max_req);
2287 			req = request_enqueue(&requests, from->msg_id++,
2288 			    buflen, offset);
2289 			offset += buflen;
2290 			num_req++;
2291 			send_read_request(from, req->id, req->offset,
2292 			    req->len, from_handle, from_handle_len);
2293 		}
2294 
2295 		/* Try to eat replies from the upload side (nonblocking) */
2296 		handle_dest_replies(to, to_path, 0,
2297 		    &num_upload_req, &write_error);
2298 
2299 		sshbuf_reset(msg);
2300 		get_msg(from, msg);
2301 		if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
2302 		    (r = sshbuf_get_u32(msg, &id)) != 0)
2303 			fatal_fr(r, "parse");
2304 		debug3("Received origin reply T:%u I:%u R:%d",
2305 		    type, id, max_req);
2306 
2307 		/* Find the request in our queue */
2308 		if ((req = request_find(&requests, id)) == NULL)
2309 			fatal("Unexpected reply %u", id);
2310 
2311 		switch (type) {
2312 		case SSH2_FXP_STATUS:
2313 			if ((r = sshbuf_get_u32(msg, &status)) != 0)
2314 				fatal_fr(r, "parse status");
2315 			if (status != SSH2_FX_EOF)
2316 				read_error = 1;
2317 			max_req = 0;
2318 			TAILQ_REMOVE(&requests, req, tq);
2319 			free(req);
2320 			num_req--;
2321 			break;
2322 		case SSH2_FXP_DATA:
2323 			if ((r = sshbuf_get_string(msg, &data, &len)) != 0)
2324 				fatal_fr(r, "parse data");
2325 			debug3("Received data %llu -> %llu",
2326 			    (unsigned long long)req->offset,
2327 			    (unsigned long long)req->offset + len - 1);
2328 			if (len > req->len)
2329 				fatal("Received more data than asked for "
2330 				    "%zu > %zu", len, req->len);
2331 
2332 			/* Write this chunk out to the destination */
2333 			sshbuf_reset(msg);
2334 			if ((r = sshbuf_put_u8(msg, SSH2_FXP_WRITE)) != 0 ||
2335 			    (r = sshbuf_put_u32(msg, to->msg_id++)) != 0 ||
2336 			    (r = sshbuf_put_string(msg, to_handle,
2337 			    to_handle_len)) != 0 ||
2338 			    (r = sshbuf_put_u64(msg, req->offset)) != 0 ||
2339 			    (r = sshbuf_put_string(msg, data, len)) != 0)
2340 				fatal_fr(r, "compose write");
2341 			send_msg(to, msg);
2342 			debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%zu",
2343 			    id, (unsigned long long)offset, len);
2344 			num_upload_req++;
2345 			progress_counter += len;
2346 			free(data);
2347 
2348 			if (len == req->len) {
2349 				TAILQ_REMOVE(&requests, req, tq);
2350 				free(req);
2351 				num_req--;
2352 			} else {
2353 				/* Resend the request for the missing data */
2354 				debug3("Short data block, re-requesting "
2355 				    "%llu -> %llu (%2d)",
2356 				    (unsigned long long)req->offset + len,
2357 				    (unsigned long long)req->offset +
2358 				    req->len - 1, num_req);
2359 				req->id = from->msg_id++;
2360 				req->len -= len;
2361 				req->offset += len;
2362 				send_read_request(from, req->id,
2363 				    req->offset, req->len,
2364 				    from_handle, from_handle_len);
2365 				/* Reduce the request size */
2366 				if (len < buflen)
2367 					buflen = MAXIMUM(MIN_READ_SIZE, len);
2368 			}
2369 			if (max_req > 0) { /* max_req = 0 iff EOF received */
2370 				if (size > 0 && offset > size) {
2371 					/* Only one request at a time
2372 					 * after the expected EOF */
2373 					debug3("Finish at %llu (%2d)",
2374 					    (unsigned long long)offset,
2375 					    num_req);
2376 					max_req = 1;
2377 				} else if (max_req < from->num_requests) {
2378 					++max_req;
2379 				}
2380 			}
2381 			break;
2382 		default:
2383 			fatal("Expected SSH2_FXP_DATA(%u) packet, got %u",
2384 			    SSH2_FXP_DATA, type);
2385 		}
2386 	}
2387 
2388 	if (showprogress && size)
2389 		stop_progress_meter();
2390 
2391 	/* Drain replies from the server (blocking) */
2392 	debug3_f("waiting for %u replies from destination", num_upload_req);
2393 	handle_dest_replies(to, to_path, 1, &num_upload_req, &write_error);
2394 
2395 	/* Sanity check */
2396 	if (TAILQ_FIRST(&requests) != NULL)
2397 		fatal("Transfer complete, but requests still in queue");
2398 	/* Truncate at 0 length on interrupt or error to avoid holes at dest */
2399 	if (read_error || write_error || interrupted) {
2400 		debug("truncating \"%s\" at 0", to_path);
2401 		do_close(to, to_handle, to_handle_len);
2402 		free(to_handle);
2403 		if (send_open(to, to_path, "dest",
2404 		    SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC, a,
2405 		    &to_handle, &to_handle_len) != 0) {
2406 			error("truncation failed for \"%s\"", to_path);
2407 			to_handle = NULL;
2408 		}
2409 	}
2410 	if (read_error) {
2411 		error("Couldn't read from origin file \"%s\" : %s",
2412 		    from_path, fx2txt(status));
2413 		status = -1;
2414 		do_close(from, from_handle, from_handle_len);
2415 		if (to_handle != NULL)
2416 			do_close(to, to_handle, to_handle_len);
2417 	} else if (write_error) {
2418 		error("Couldn't write to \"%s\": %s",
2419 		    to_path, fx2txt(write_error));
2420 		status = SSH2_FX_FAILURE;
2421 		do_close(from, from_handle, from_handle_len);
2422 		if (to_handle != NULL)
2423 			do_close(to, to_handle, to_handle_len);
2424 	} else {
2425 		if (do_close(from, from_handle, from_handle_len) != 0 ||
2426 		    interrupted)
2427 			status = -1;
2428 		else
2429 			status = SSH2_FX_OK;
2430 		if (to_handle != NULL) {
2431 			/* Need to resend utimes after write */
2432 			if (preserve_flag)
2433 				do_fsetstat(to, to_handle, to_handle_len, a);
2434 			do_close(to, to_handle, to_handle_len);
2435 		}
2436 	}
2437 	sshbuf_free(msg);
2438 	free(from_handle);
2439 	free(to_handle);
2440 
2441 	return status == SSH2_FX_OK ? 0 : -1;
2442 }
2443 
2444 static int
2445 crossload_dir_internal(struct sftp_conn *from, struct sftp_conn *to,
2446     const char *from_path, const char *to_path,
2447     int depth, Attrib *dirattrib, int preserve_flag, int print_flag,
2448     int follow_link_flag)
2449 {
2450 	int i, ret = 0;
2451 	SFTP_DIRENT **dir_entries;
2452 	char *filename, *new_from_path = NULL, *new_to_path = NULL;
2453 	mode_t mode = 0777;
2454 	Attrib curdir;
2455 
2456 	if (depth >= MAX_DIR_DEPTH) {
2457 		error("Maximum directory depth exceeded: %d levels", depth);
2458 		return -1;
2459 	}
2460 
2461 	if (dirattrib == NULL &&
2462 	    (dirattrib = do_stat(from, from_path, 1)) == NULL) {
2463 		error("Unable to stat remote directory \"%s\"", from_path);
2464 		return -1;
2465 	}
2466 	if (!S_ISDIR(dirattrib->perm)) {
2467 		error("\"%s\" is not a directory", from_path);
2468 		return -1;
2469 	}
2470 	if (print_flag && print_flag != SFTP_PROGRESS_ONLY)
2471 		mprintf("Retrieving %s\n", from_path);
2472 
2473 	curdir = *dirattrib; /* dirattrib will be clobbered */
2474 	curdir.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
2475 	curdir.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
2476 	if ((curdir.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) == 0) {
2477 		debug("Origin did not send permissions for "
2478 		    "directory \"%s\"", to_path);
2479 		curdir.perm = S_IWUSR|S_IXUSR;
2480 		curdir.flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
2481 	}
2482 	/* We need to be able to write to the directory while we transfer it */
2483 	mode = curdir.perm & 01777;
2484 	curdir.perm = mode | (S_IWUSR|S_IXUSR);
2485 
2486 	/*
2487 	 * sftp lacks a portable status value to match errno EEXIST,
2488 	 * so if we get a failure back then we must check whether
2489 	 * the path already existed and is a directory.  Ensure we can
2490 	 * write to the directory we create for the duration of the transfer.
2491 	 */
2492 	if (do_mkdir(to, to_path, &curdir, 0) != 0) {
2493 		if ((dirattrib = do_stat(to, to_path, 0)) == NULL)
2494 			return -1;
2495 		if (!S_ISDIR(dirattrib->perm)) {
2496 			error("\"%s\" exists but is not a directory", to_path);
2497 			return -1;
2498 		}
2499 	}
2500 	curdir.perm = mode;
2501 
2502 	if (do_readdir(from, from_path, &dir_entries) == -1) {
2503 		error("%s: Failed to get directory contents", from_path);
2504 		return -1;
2505 	}
2506 
2507 	for (i = 0; dir_entries[i] != NULL && !interrupted; i++) {
2508 		free(new_from_path);
2509 		free(new_to_path);
2510 
2511 		filename = dir_entries[i]->filename;
2512 		new_from_path = path_append(from_path, filename);
2513 		new_to_path = path_append(to_path, filename);
2514 
2515 		if (S_ISDIR(dir_entries[i]->a.perm)) {
2516 			if (strcmp(filename, ".") == 0 ||
2517 			    strcmp(filename, "..") == 0)
2518 				continue;
2519 			if (crossload_dir_internal(from, to,
2520 			    new_from_path, new_to_path,
2521 			    depth + 1, &(dir_entries[i]->a), preserve_flag,
2522 			    print_flag, follow_link_flag) == -1)
2523 				ret = -1;
2524 		} else if (S_ISREG(dir_entries[i]->a.perm) ||
2525 		    (follow_link_flag && S_ISLNK(dir_entries[i]->a.perm))) {
2526 			/*
2527 			 * If this is a symlink then don't send the link's
2528 			 * Attrib. do_download() will do a FXP_STAT operation
2529 			 * and get the link target's attributes.
2530 			 */
2531 			if (do_crossload(from, to, new_from_path, new_to_path,
2532 			    S_ISLNK(dir_entries[i]->a.perm) ? NULL :
2533 			    &(dir_entries[i]->a), preserve_flag) == -1) {
2534 				error("Transfer of file %s to %s failed",
2535 				    new_from_path, new_to_path);
2536 				ret = -1;
2537 			}
2538 		} else
2539 			logit("%s: not a regular file\n", new_from_path);
2540 
2541 	}
2542 	free(new_to_path);
2543 	free(new_from_path);
2544 
2545 	do_setstat(to, to_path, &curdir);
2546 
2547 	free_sftp_dirents(dir_entries);
2548 
2549 	return ret;
2550 }
2551 
2552 int
2553 crossload_dir(struct sftp_conn *from, struct sftp_conn *to,
2554     const char *from_path, const char *to_path,
2555     Attrib *dirattrib, int preserve_flag, int print_flag, int follow_link_flag)
2556 {
2557 	char *from_path_canon;
2558 	int ret;
2559 
2560 	if ((from_path_canon = do_realpath(from, from_path)) == NULL) {
2561 		error("Unable to canonicalize path \"%s\"", from_path);
2562 		return -1;
2563 	}
2564 
2565 	ret = crossload_dir_internal(from, to, from_path_canon, to_path, 0,
2566 	    dirattrib, preserve_flag, print_flag, follow_link_flag);
2567 	free(from_path_canon);
2568 	return ret;
2569 }
2570 
2571 char *
2572 path_append(const char *p1, const char *p2)
2573 {
2574 	char *ret;
2575 	size_t len = strlen(p1) + strlen(p2) + 2;
2576 
2577 	ret = xmalloc(len);
2578 	strlcpy(ret, p1, len);
2579 	if (p1[0] != '\0' && p1[strlen(p1) - 1] != '/')
2580 		strlcat(ret, "/", len);
2581 	strlcat(ret, p2, len);
2582 
2583 	return(ret);
2584 }
2585 
2586 char *
2587 make_absolute(char *p, const char *pwd)
2588 {
2589 	char *abs_str;
2590 
2591 	/* Derelativise */
2592 	if (p && !path_absolute(p)) {
2593 		abs_str = path_append(pwd, p);
2594 		free(p);
2595 		return(abs_str);
2596 	} else
2597 		return(p);
2598 }
2599 
2600 int
2601 remote_is_dir(struct sftp_conn *conn, const char *path)
2602 {
2603 	Attrib *a;
2604 
2605 	/* XXX: report errors? */
2606 	if ((a = do_stat(conn, path, 1)) == NULL)
2607 		return(0);
2608 	if (!(a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS))
2609 		return(0);
2610 	return(S_ISDIR(a->perm));
2611 }
2612 
2613 
2614 int
2615 local_is_dir(const char *path)
2616 {
2617 	struct stat sb;
2618 
2619 	/* XXX: report errors? */
2620 	if (stat(path, &sb) == -1)
2621 		return(0);
2622 
2623 	return(S_ISDIR(sb.st_mode));
2624 }
2625 
2626 /* Check whether path returned from glob(..., GLOB_MARK, ...) is a directory */
2627 int
2628 globpath_is_dir(const char *pathname)
2629 {
2630 	size_t l = strlen(pathname);
2631 
2632 	return l > 0 && pathname[l - 1] == '/';
2633 }
2634 
2635