xref: /openssh-portable/scp.c (revision 887669ef)
1 /* $OpenBSD: scp.c,v 1.193 2017/10/21 23:06:24 millert Exp $ */
2 /*
3  * scp - secure remote copy.  This is basically patched BSD rcp which
4  * uses ssh to do the data transfer (instead of using rcmd).
5  *
6  * NOTE: This version should NOT be suid root.  (This uses ssh to
7  * do the transfer and ssh has the necessary privileges.)
8  *
9  * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
10  *
11  * As far as I am concerned, the code I have written for this software
12  * can be used freely for any purpose.  Any derived versions of this
13  * software must be clearly marked as such, and if the derived work is
14  * incompatible with the protocol description in the RFC file, it must be
15  * called by a name other than "ssh" or "Secure Shell".
16  */
17 /*
18  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
19  * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
20  *
21  * Redistribution and use in source and binary forms, with or without
22  * modification, are permitted provided that the following conditions
23  * are met:
24  * 1. Redistributions of source code must retain the above copyright
25  *    notice, this list of conditions and the following disclaimer.
26  * 2. Redistributions in binary form must reproduce the above copyright
27  *    notice, this list of conditions and the following disclaimer in the
28  *    documentation and/or other materials provided with the distribution.
29  *
30  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40  */
41 
42 /*
43  * Parts from:
44  *
45  * Copyright (c) 1983, 1990, 1992, 1993, 1995
46  *	The Regents of the University of California.  All rights reserved.
47  *
48  * Redistribution and use in source and binary forms, with or without
49  * modification, are permitted provided that the following conditions
50  * are met:
51  * 1. Redistributions of source code must retain the above copyright
52  *    notice, this list of conditions and the following disclaimer.
53  * 2. Redistributions in binary form must reproduce the above copyright
54  *    notice, this list of conditions and the following disclaimer in the
55  *    documentation and/or other materials provided with the distribution.
56  * 3. Neither the name of the University nor the names of its contributors
57  *    may be used to endorse or promote products derived from this software
58  *    without specific prior written permission.
59  *
60  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
61  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
63  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
64  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
65  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
66  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
67  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
68  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
69  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70  * SUCH DAMAGE.
71  *
72  */
73 
74 #include "includes.h"
75 
76 #include <sys/types.h>
77 #ifdef HAVE_SYS_STAT_H
78 # include <sys/stat.h>
79 #endif
80 #ifdef HAVE_POLL_H
81 #include <poll.h>
82 #else
83 # ifdef HAVE_SYS_POLL_H
84 #  include <sys/poll.h>
85 # endif
86 #endif
87 #ifdef HAVE_SYS_TIME_H
88 # include <sys/time.h>
89 #endif
90 #include <sys/wait.h>
91 #include <sys/uio.h>
92 
93 #include <ctype.h>
94 #include <dirent.h>
95 #include <errno.h>
96 #include <fcntl.h>
97 #include <limits.h>
98 #include <locale.h>
99 #include <pwd.h>
100 #include <signal.h>
101 #include <stdarg.h>
102 #ifdef HAVE_STDINT_H
103 #include <stdint.h>
104 #endif
105 #include <stdio.h>
106 #include <stdlib.h>
107 #include <string.h>
108 #include <time.h>
109 #include <unistd.h>
110 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
111 #include <vis.h>
112 #endif
113 
114 #include "xmalloc.h"
115 #include "ssh.h"
116 #include "atomicio.h"
117 #include "pathnames.h"
118 #include "log.h"
119 #include "misc.h"
120 #include "progressmeter.h"
121 #include "utf8.h"
122 
123 extern char *__progname;
124 
125 #define COPY_BUFLEN	16384
126 
127 int do_cmd(char *host, char *remuser, int port, char *cmd, int *fdin, int *fdout);
128 int do_cmd2(char *host, char *remuser, int port, char *cmd, int fdin, int fdout);
129 
130 /* Struct for addargs */
131 arglist args;
132 arglist remote_remote_args;
133 
134 /* Bandwidth limit */
135 long long limit_kbps = 0;
136 struct bwlimit bwlimit;
137 
138 /* Name of current file being transferred. */
139 char *curfile;
140 
141 /* This is set to non-zero to enable verbose mode. */
142 int verbose_mode = 0;
143 
144 /* This is set to zero if the progressmeter is not desired. */
145 int showprogress = 1;
146 
147 /*
148  * This is set to non-zero if remote-remote copy should be piped
149  * through this process.
150  */
151 int throughlocal = 0;
152 
153 /* Non-standard port to use for the ssh connection or -1. */
154 int sshport = -1;
155 
156 /* This is the program to execute for the secured connection. ("ssh" or -S) */
157 char *ssh_program = _PATH_SSH_PROGRAM;
158 
159 /* This is used to store the pid of ssh_program */
160 pid_t do_cmd_pid = -1;
161 
162 static void
163 killchild(int signo)
164 {
165 	if (do_cmd_pid > 1) {
166 		kill(do_cmd_pid, signo ? signo : SIGTERM);
167 		waitpid(do_cmd_pid, NULL, 0);
168 	}
169 
170 	if (signo)
171 		_exit(1);
172 	exit(1);
173 }
174 
175 static void
176 suspchild(int signo)
177 {
178 	int status;
179 
180 	if (do_cmd_pid > 1) {
181 		kill(do_cmd_pid, signo);
182 		while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
183 		    errno == EINTR)
184 			;
185 		kill(getpid(), SIGSTOP);
186 	}
187 }
188 
189 static int
190 do_local_cmd(arglist *a)
191 {
192 	u_int i;
193 	int status;
194 	pid_t pid;
195 
196 	if (a->num == 0)
197 		fatal("do_local_cmd: no arguments");
198 
199 	if (verbose_mode) {
200 		fprintf(stderr, "Executing:");
201 		for (i = 0; i < a->num; i++)
202 			fmprintf(stderr, " %s", a->list[i]);
203 		fprintf(stderr, "\n");
204 	}
205 	if ((pid = fork()) == -1)
206 		fatal("do_local_cmd: fork: %s", strerror(errno));
207 
208 	if (pid == 0) {
209 		execvp(a->list[0], a->list);
210 		perror(a->list[0]);
211 		exit(1);
212 	}
213 
214 	do_cmd_pid = pid;
215 	signal(SIGTERM, killchild);
216 	signal(SIGINT, killchild);
217 	signal(SIGHUP, killchild);
218 
219 	while (waitpid(pid, &status, 0) == -1)
220 		if (errno != EINTR)
221 			fatal("do_local_cmd: waitpid: %s", strerror(errno));
222 
223 	do_cmd_pid = -1;
224 
225 	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
226 		return (-1);
227 
228 	return (0);
229 }
230 
231 /*
232  * This function executes the given command as the specified user on the
233  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
234  * assigns the input and output file descriptors on success.
235  */
236 
237 int
238 do_cmd(char *host, char *remuser, int port, char *cmd, int *fdin, int *fdout)
239 {
240 	int pin[2], pout[2], reserved[2];
241 
242 	if (verbose_mode)
243 		fmprintf(stderr,
244 		    "Executing: program %s host %s, user %s, command %s\n",
245 		    ssh_program, host,
246 		    remuser ? remuser : "(unspecified)", cmd);
247 
248 	if (port == -1)
249 		port = sshport;
250 
251 	/*
252 	 * Reserve two descriptors so that the real pipes won't get
253 	 * descriptors 0 and 1 because that will screw up dup2 below.
254 	 */
255 	if (pipe(reserved) < 0)
256 		fatal("pipe: %s", strerror(errno));
257 
258 	/* Create a socket pair for communicating with ssh. */
259 	if (pipe(pin) < 0)
260 		fatal("pipe: %s", strerror(errno));
261 	if (pipe(pout) < 0)
262 		fatal("pipe: %s", strerror(errno));
263 
264 	/* Free the reserved descriptors. */
265 	close(reserved[0]);
266 	close(reserved[1]);
267 
268 	signal(SIGTSTP, suspchild);
269 	signal(SIGTTIN, suspchild);
270 	signal(SIGTTOU, suspchild);
271 
272 	/* Fork a child to execute the command on the remote host using ssh. */
273 	do_cmd_pid = fork();
274 	if (do_cmd_pid == 0) {
275 		/* Child. */
276 		close(pin[1]);
277 		close(pout[0]);
278 		dup2(pin[0], 0);
279 		dup2(pout[1], 1);
280 		close(pin[0]);
281 		close(pout[1]);
282 
283 		replacearg(&args, 0, "%s", ssh_program);
284 		if (port != -1) {
285 			addargs(&args, "-p");
286 			addargs(&args, "%d", port);
287 		}
288 		if (remuser != NULL) {
289 			addargs(&args, "-l");
290 			addargs(&args, "%s", remuser);
291 		}
292 		addargs(&args, "--");
293 		addargs(&args, "%s", host);
294 		addargs(&args, "%s", cmd);
295 
296 		execvp(ssh_program, args.list);
297 		perror(ssh_program);
298 		exit(1);
299 	} else if (do_cmd_pid == -1) {
300 		fatal("fork: %s", strerror(errno));
301 	}
302 	/* Parent.  Close the other side, and return the local side. */
303 	close(pin[0]);
304 	*fdout = pin[1];
305 	close(pout[1]);
306 	*fdin = pout[0];
307 	signal(SIGTERM, killchild);
308 	signal(SIGINT, killchild);
309 	signal(SIGHUP, killchild);
310 	return 0;
311 }
312 
313 /*
314  * This functions executes a command simlar to do_cmd(), but expects the
315  * input and output descriptors to be setup by a previous call to do_cmd().
316  * This way the input and output of two commands can be connected.
317  */
318 int
319 do_cmd2(char *host, char *remuser, int port, char *cmd, int fdin, int fdout)
320 {
321 	pid_t pid;
322 	int status;
323 
324 	if (verbose_mode)
325 		fmprintf(stderr,
326 		    "Executing: 2nd program %s host %s, user %s, command %s\n",
327 		    ssh_program, host,
328 		    remuser ? remuser : "(unspecified)", cmd);
329 
330 	if (port == -1)
331 		port = sshport;
332 
333 	/* Fork a child to execute the command on the remote host using ssh. */
334 	pid = fork();
335 	if (pid == 0) {
336 		dup2(fdin, 0);
337 		dup2(fdout, 1);
338 
339 		replacearg(&args, 0, "%s", ssh_program);
340 		if (port != -1) {
341 			addargs(&args, "-p");
342 			addargs(&args, "%d", port);
343 		}
344 		if (remuser != NULL) {
345 			addargs(&args, "-l");
346 			addargs(&args, "%s", remuser);
347 		}
348 		addargs(&args, "--");
349 		addargs(&args, "%s", host);
350 		addargs(&args, "%s", cmd);
351 
352 		execvp(ssh_program, args.list);
353 		perror(ssh_program);
354 		exit(1);
355 	} else if (pid == -1) {
356 		fatal("fork: %s", strerror(errno));
357 	}
358 	while (waitpid(pid, &status, 0) == -1)
359 		if (errno != EINTR)
360 			fatal("do_cmd2: waitpid: %s", strerror(errno));
361 	return 0;
362 }
363 
364 typedef struct {
365 	size_t cnt;
366 	char *buf;
367 } BUF;
368 
369 BUF *allocbuf(BUF *, int, int);
370 void lostconn(int);
371 int okname(char *);
372 void run_err(const char *,...);
373 void verifydir(char *);
374 
375 struct passwd *pwd;
376 uid_t userid;
377 int errs, remin, remout;
378 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
379 
380 #define	CMDNEEDS	64
381 char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
382 
383 int response(void);
384 void rsource(char *, struct stat *);
385 void sink(int, char *[]);
386 void source(int, char *[]);
387 void tolocal(int, char *[]);
388 void toremote(int, char *[]);
389 void usage(void);
390 
391 int
392 main(int argc, char **argv)
393 {
394 	int ch, fflag, tflag, status, n;
395 	char **newargv;
396 	const char *errstr;
397 	extern char *optarg;
398 	extern int optind;
399 
400 	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
401 	sanitise_stdfd();
402 
403 	msetlocale();
404 
405 	/* Copy argv, because we modify it */
406 	newargv = xcalloc(MAXIMUM(argc + 1, 1), sizeof(*newargv));
407 	for (n = 0; n < argc; n++)
408 		newargv[n] = xstrdup(argv[n]);
409 	argv = newargv;
410 
411 	__progname = ssh_get_progname(argv[0]);
412 
413 	memset(&args, '\0', sizeof(args));
414 	memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
415 	args.list = remote_remote_args.list = NULL;
416 	addargs(&args, "%s", ssh_program);
417 	addargs(&args, "-x");
418 	addargs(&args, "-oForwardAgent=no");
419 	addargs(&args, "-oPermitLocalCommand=no");
420 	addargs(&args, "-oClearAllForwardings=yes");
421 
422 	fflag = tflag = 0;
423 	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
424 		switch (ch) {
425 		/* User-visible flags. */
426 		case '1':
427 			fatal("SSH protocol v.1 is no longer supported");
428 			break;
429 		case '2':
430 			/* Ignored */
431 			break;
432 		case '4':
433 		case '6':
434 		case 'C':
435 			addargs(&args, "-%c", ch);
436 			addargs(&remote_remote_args, "-%c", ch);
437 			break;
438 		case '3':
439 			throughlocal = 1;
440 			break;
441 		case 'o':
442 		case 'c':
443 		case 'i':
444 		case 'F':
445 			addargs(&remote_remote_args, "-%c", ch);
446 			addargs(&remote_remote_args, "%s", optarg);
447 			addargs(&args, "-%c", ch);
448 			addargs(&args, "%s", optarg);
449 			break;
450 		case 'P':
451 			sshport = a2port(optarg);
452 			if (sshport <= 0)
453 				fatal("bad port \"%s\"\n", optarg);
454 			break;
455 		case 'B':
456 			addargs(&remote_remote_args, "-oBatchmode=yes");
457 			addargs(&args, "-oBatchmode=yes");
458 			break;
459 		case 'l':
460 			limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
461 			    &errstr);
462 			if (errstr != NULL)
463 				usage();
464 			limit_kbps *= 1024; /* kbps */
465 			bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
466 			break;
467 		case 'p':
468 			pflag = 1;
469 			break;
470 		case 'r':
471 			iamrecursive = 1;
472 			break;
473 		case 'S':
474 			ssh_program = xstrdup(optarg);
475 			break;
476 		case 'v':
477 			addargs(&args, "-v");
478 			addargs(&remote_remote_args, "-v");
479 			verbose_mode = 1;
480 			break;
481 		case 'q':
482 			addargs(&args, "-q");
483 			addargs(&remote_remote_args, "-q");
484 			showprogress = 0;
485 			break;
486 
487 		/* Server options. */
488 		case 'd':
489 			targetshouldbedirectory = 1;
490 			break;
491 		case 'f':	/* "from" */
492 			iamremote = 1;
493 			fflag = 1;
494 			break;
495 		case 't':	/* "to" */
496 			iamremote = 1;
497 			tflag = 1;
498 #ifdef HAVE_CYGWIN
499 			setmode(0, O_BINARY);
500 #endif
501 			break;
502 		default:
503 			usage();
504 		}
505 	argc -= optind;
506 	argv += optind;
507 
508 	if ((pwd = getpwuid(userid = getuid())) == NULL)
509 		fatal("unknown user %u", (u_int) userid);
510 
511 	if (!isatty(STDOUT_FILENO))
512 		showprogress = 0;
513 
514 	if (pflag) {
515 		/* Cannot pledge: -p allows setuid/setgid files... */
516 	} else {
517 		if (pledge("stdio rpath wpath cpath fattr tty proc exec",
518 		    NULL) == -1) {
519 			perror("pledge");
520 			exit(1);
521 		}
522 	}
523 
524 	remin = STDIN_FILENO;
525 	remout = STDOUT_FILENO;
526 
527 	if (fflag) {
528 		/* Follow "protocol", send data. */
529 		(void) response();
530 		source(argc, argv);
531 		exit(errs != 0);
532 	}
533 	if (tflag) {
534 		/* Receive data. */
535 		sink(argc, argv);
536 		exit(errs != 0);
537 	}
538 	if (argc < 2)
539 		usage();
540 	if (argc > 2)
541 		targetshouldbedirectory = 1;
542 
543 	remin = remout = -1;
544 	do_cmd_pid = -1;
545 	/* Command to be executed on remote system using "ssh". */
546 	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
547 	    verbose_mode ? " -v" : "",
548 	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
549 	    targetshouldbedirectory ? " -d" : "");
550 
551 	(void) signal(SIGPIPE, lostconn);
552 
553 	if (colon(argv[argc - 1]))	/* Dest is remote host. */
554 		toremote(argc, argv);
555 	else {
556 		if (targetshouldbedirectory)
557 			verifydir(argv[argc - 1]);
558 		tolocal(argc, argv);	/* Dest is local host. */
559 	}
560 	/*
561 	 * Finally check the exit status of the ssh process, if one was forked
562 	 * and no error has occurred yet
563 	 */
564 	if (do_cmd_pid != -1 && errs == 0) {
565 		if (remin != -1)
566 		    (void) close(remin);
567 		if (remout != -1)
568 		    (void) close(remout);
569 		if (waitpid(do_cmd_pid, &status, 0) == -1)
570 			errs = 1;
571 		else {
572 			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
573 				errs = 1;
574 		}
575 	}
576 	exit(errs != 0);
577 }
578 
579 /* Callback from atomicio6 to update progress meter and limit bandwidth */
580 static int
581 scpio(void *_cnt, size_t s)
582 {
583 	off_t *cnt = (off_t *)_cnt;
584 
585 	*cnt += s;
586 	if (limit_kbps > 0)
587 		bandwidth_limit(&bwlimit, s);
588 	return 0;
589 }
590 
591 static int
592 do_times(int fd, int verb, const struct stat *sb)
593 {
594 	/* strlen(2^64) == 20; strlen(10^6) == 7 */
595 	char buf[(20 + 7 + 2) * 2 + 2];
596 
597 	(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
598 	    (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
599 	    (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
600 	if (verb) {
601 		fprintf(stderr, "File mtime %lld atime %lld\n",
602 		    (long long)sb->st_mtime, (long long)sb->st_atime);
603 		fprintf(stderr, "Sending file timestamps: %s", buf);
604 	}
605 	(void) atomicio(vwrite, fd, buf, strlen(buf));
606 	return (response());
607 }
608 
609 void
610 toremote(int argc, char **argv)
611 {
612 	char *suser = NULL, *host = NULL, *src = NULL;
613 	char *bp, *tuser, *thost, *targ;
614 	int sport = -1, tport = -1;
615 	arglist alist;
616 	int i, r;
617 	u_int j;
618 
619 	memset(&alist, '\0', sizeof(alist));
620 	alist.list = NULL;
621 
622 	/* Parse target */
623 	r = parse_uri("scp", argv[argc - 1], &tuser, &thost, &tport, &targ);
624 	if (r == -1)
625 		goto out;	/* invalid URI */
626 	if (r != 0) {
627 		if (parse_user_host_path(argv[argc - 1], &tuser, &thost,
628 		    &targ) == -1)
629 			goto out;
630 	}
631 	if (tuser != NULL && !okname(tuser))
632 		goto out;
633 
634 	/* Parse source files */
635 	for (i = 0; i < argc - 1; i++) {
636 		free(suser);
637 		free(host);
638 		free(src);
639 		r = parse_uri("scp", argv[i], &suser, &host, &sport, &src);
640 		if (r == -1)
641 			continue;	/* invalid URI */
642 		if (r != 0)
643 			parse_user_host_path(argv[i], &suser, &host, &src);
644 		if (suser != NULL && !okname(suser)) {
645 			++errs;
646 			continue;
647 		}
648 		if (host && throughlocal) {	/* extended remote to remote */
649 			xasprintf(&bp, "%s -f %s%s", cmd,
650 			    *src == '-' ? "-- " : "", src);
651 			if (do_cmd(host, suser, sport, bp, &remin, &remout) < 0)
652 				exit(1);
653 			free(bp);
654 			xasprintf(&bp, "%s -t %s%s", cmd,
655 			    *targ == '-' ? "-- " : "", targ);
656 			if (do_cmd2(thost, tuser, tport, bp, remin, remout) < 0)
657 				exit(1);
658 			free(bp);
659 			(void) close(remin);
660 			(void) close(remout);
661 			remin = remout = -1;
662 		} else if (host) {	/* standard remote to remote */
663 			if (tport != -1 && tport != SSH_DEFAULT_PORT) {
664 				/* This would require the remote support URIs */
665 				fatal("target port not supported with two "
666 				    "remote hosts without the -3 option");
667 			}
668 
669 			freeargs(&alist);
670 			addargs(&alist, "%s", ssh_program);
671 			addargs(&alist, "-x");
672 			addargs(&alist, "-oClearAllForwardings=yes");
673 			addargs(&alist, "-n");
674 			for (j = 0; j < remote_remote_args.num; j++) {
675 				addargs(&alist, "%s",
676 				    remote_remote_args.list[j]);
677 			}
678 
679 			if (sport != -1) {
680 				addargs(&alist, "-p");
681 				addargs(&alist, "%d", sport);
682 			}
683 			if (suser) {
684 				addargs(&alist, "-l");
685 				addargs(&alist, "%s", suser);
686 			}
687 			addargs(&alist, "--");
688 			addargs(&alist, "%s", host);
689 			addargs(&alist, "%s", cmd);
690 			addargs(&alist, "%s", src);
691 			addargs(&alist, "%s%s%s:%s",
692 			    tuser ? tuser : "", tuser ? "@" : "",
693 			    thost, targ);
694 			if (do_local_cmd(&alist) != 0)
695 				errs = 1;
696 		} else {	/* local to remote */
697 			if (remin == -1) {
698 				xasprintf(&bp, "%s -t %s%s", cmd,
699 				    *targ == '-' ? "-- " : "", targ);
700 				if (do_cmd(thost, tuser, tport, bp, &remin,
701 				    &remout) < 0)
702 					exit(1);
703 				if (response() < 0)
704 					exit(1);
705 				free(bp);
706 			}
707 			source(1, argv + i);
708 		}
709 	}
710 out:
711 	free(tuser);
712 	free(thost);
713 	free(targ);
714 	free(suser);
715 	free(host);
716 	free(src);
717 }
718 
719 void
720 tolocal(int argc, char **argv)
721 {
722 	char *bp, *host = NULL, *src = NULL, *suser = NULL;
723 	arglist alist;
724 	int i, r, sport = -1;
725 
726 	memset(&alist, '\0', sizeof(alist));
727 	alist.list = NULL;
728 
729 	for (i = 0; i < argc - 1; i++) {
730 		free(suser);
731 		free(host);
732 		free(src);
733 		r = parse_uri("scp", argv[i], &suser, &host, &sport, &src);
734 		if (r == -1) {
735 			++errs;
736 			continue;
737 		}
738 		if (r != 0)
739 			parse_user_host_path(argv[i], &suser, &host, &src);
740 		if (suser != NULL && !okname(suser)) {
741 			++errs;
742 			continue;
743 		}
744 		if (!host) {	/* Local to local. */
745 			freeargs(&alist);
746 			addargs(&alist, "%s", _PATH_CP);
747 			if (iamrecursive)
748 				addargs(&alist, "-r");
749 			if (pflag)
750 				addargs(&alist, "-p");
751 			addargs(&alist, "--");
752 			addargs(&alist, "%s", argv[i]);
753 			addargs(&alist, "%s", argv[argc-1]);
754 			if (do_local_cmd(&alist))
755 				++errs;
756 			continue;
757 		}
758 		/* Remote to local. */
759 		xasprintf(&bp, "%s -f %s%s",
760 		    cmd, *src == '-' ? "-- " : "", src);
761 		if (do_cmd(host, suser, sport, bp, &remin, &remout) < 0) {
762 			free(bp);
763 			++errs;
764 			continue;
765 		}
766 		free(bp);
767 		sink(1, argv + argc - 1);
768 		(void) close(remin);
769 		remin = remout = -1;
770 	}
771 	free(suser);
772 	free(host);
773 	free(src);
774 }
775 
776 void
777 source(int argc, char **argv)
778 {
779 	struct stat stb;
780 	static BUF buffer;
781 	BUF *bp;
782 	off_t i, statbytes;
783 	size_t amt, nr;
784 	int fd = -1, haderr, indx;
785 	char *last, *name, buf[2048], encname[PATH_MAX];
786 	int len;
787 
788 	for (indx = 0; indx < argc; ++indx) {
789 		name = argv[indx];
790 		statbytes = 0;
791 		len = strlen(name);
792 		while (len > 1 && name[len-1] == '/')
793 			name[--len] = '\0';
794 		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
795 			goto syserr;
796 		if (strchr(name, '\n') != NULL) {
797 			strnvis(encname, name, sizeof(encname), VIS_NL);
798 			name = encname;
799 		}
800 		if (fstat(fd, &stb) < 0) {
801 syserr:			run_err("%s: %s", name, strerror(errno));
802 			goto next;
803 		}
804 		if (stb.st_size < 0) {
805 			run_err("%s: %s", name, "Negative file size");
806 			goto next;
807 		}
808 		unset_nonblock(fd);
809 		switch (stb.st_mode & S_IFMT) {
810 		case S_IFREG:
811 			break;
812 		case S_IFDIR:
813 			if (iamrecursive) {
814 				rsource(name, &stb);
815 				goto next;
816 			}
817 			/* FALLTHROUGH */
818 		default:
819 			run_err("%s: not a regular file", name);
820 			goto next;
821 		}
822 		if ((last = strrchr(name, '/')) == NULL)
823 			last = name;
824 		else
825 			++last;
826 		curfile = last;
827 		if (pflag) {
828 			if (do_times(remout, verbose_mode, &stb) < 0)
829 				goto next;
830 		}
831 #define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
832 		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
833 		    (u_int) (stb.st_mode & FILEMODEMASK),
834 		    (long long)stb.st_size, last);
835 		if (verbose_mode)
836 			fmprintf(stderr, "Sending file modes: %s", buf);
837 		(void) atomicio(vwrite, remout, buf, strlen(buf));
838 		if (response() < 0)
839 			goto next;
840 		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
841 next:			if (fd != -1) {
842 				(void) close(fd);
843 				fd = -1;
844 			}
845 			continue;
846 		}
847 		if (showprogress)
848 			start_progress_meter(curfile, stb.st_size, &statbytes);
849 		set_nonblock(remout);
850 		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
851 			amt = bp->cnt;
852 			if (i + (off_t)amt > stb.st_size)
853 				amt = stb.st_size - i;
854 			if (!haderr) {
855 				if ((nr = atomicio(read, fd,
856 				    bp->buf, amt)) != amt) {
857 					haderr = errno;
858 					memset(bp->buf + nr, 0, amt - nr);
859 				}
860 			}
861 			/* Keep writing after error to retain sync */
862 			if (haderr) {
863 				(void)atomicio(vwrite, remout, bp->buf, amt);
864 				memset(bp->buf, 0, amt);
865 				continue;
866 			}
867 			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
868 			    &statbytes) != amt)
869 				haderr = errno;
870 		}
871 		unset_nonblock(remout);
872 
873 		if (fd != -1) {
874 			if (close(fd) < 0 && !haderr)
875 				haderr = errno;
876 			fd = -1;
877 		}
878 		if (!haderr)
879 			(void) atomicio(vwrite, remout, "", 1);
880 		else
881 			run_err("%s: %s", name, strerror(haderr));
882 		(void) response();
883 		if (showprogress)
884 			stop_progress_meter();
885 	}
886 }
887 
888 void
889 rsource(char *name, struct stat *statp)
890 {
891 	DIR *dirp;
892 	struct dirent *dp;
893 	char *last, *vect[1], path[PATH_MAX];
894 
895 	if (!(dirp = opendir(name))) {
896 		run_err("%s: %s", name, strerror(errno));
897 		return;
898 	}
899 	last = strrchr(name, '/');
900 	if (last == NULL)
901 		last = name;
902 	else
903 		last++;
904 	if (pflag) {
905 		if (do_times(remout, verbose_mode, statp) < 0) {
906 			closedir(dirp);
907 			return;
908 		}
909 	}
910 	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
911 	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
912 	if (verbose_mode)
913 		fmprintf(stderr, "Entering directory: %s", path);
914 	(void) atomicio(vwrite, remout, path, strlen(path));
915 	if (response() < 0) {
916 		closedir(dirp);
917 		return;
918 	}
919 	while ((dp = readdir(dirp)) != NULL) {
920 		if (dp->d_ino == 0)
921 			continue;
922 		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
923 			continue;
924 		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
925 			run_err("%s/%s: name too long", name, dp->d_name);
926 			continue;
927 		}
928 		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
929 		vect[0] = path;
930 		source(1, vect);
931 	}
932 	(void) closedir(dirp);
933 	(void) atomicio(vwrite, remout, "E\n", 2);
934 	(void) response();
935 }
936 
937 #define TYPE_OVERFLOW(type, val) \
938 	((sizeof(type) == 4 && (val) > INT32_MAX) || \
939 	 (sizeof(type) == 8 && (val) > INT64_MAX) || \
940 	 (sizeof(type) != 4 && sizeof(type) != 8))
941 
942 void
943 sink(int argc, char **argv)
944 {
945 	static BUF buffer;
946 	struct stat stb;
947 	enum {
948 		YES, NO, DISPLAYED
949 	} wrerr;
950 	BUF *bp;
951 	off_t i;
952 	size_t j, count;
953 	int amt, exists, first, ofd;
954 	mode_t mode, omode, mask;
955 	off_t size, statbytes;
956 	unsigned long long ull;
957 	int setimes, targisdir, wrerrno = 0;
958 	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
959 	struct timeval tv[2];
960 
961 #define	atime	tv[0]
962 #define	mtime	tv[1]
963 #define	SCREWUP(str)	{ why = str; goto screwup; }
964 
965 	if (TYPE_OVERFLOW(time_t, 0) || TYPE_OVERFLOW(off_t, 0))
966 		SCREWUP("Unexpected off_t/time_t size");
967 
968 	setimes = targisdir = 0;
969 	mask = umask(0);
970 	if (!pflag)
971 		(void) umask(mask);
972 	if (argc != 1) {
973 		run_err("ambiguous target");
974 		exit(1);
975 	}
976 	targ = *argv;
977 	if (targetshouldbedirectory)
978 		verifydir(targ);
979 
980 	(void) atomicio(vwrite, remout, "", 1);
981 	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
982 		targisdir = 1;
983 	for (first = 1;; first = 0) {
984 		cp = buf;
985 		if (atomicio(read, remin, cp, 1) != 1)
986 			return;
987 		if (*cp++ == '\n')
988 			SCREWUP("unexpected <newline>");
989 		do {
990 			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
991 				SCREWUP("lost connection");
992 			*cp++ = ch;
993 		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
994 		*cp = 0;
995 		if (verbose_mode)
996 			fmprintf(stderr, "Sink: %s", buf);
997 
998 		if (buf[0] == '\01' || buf[0] == '\02') {
999 			if (iamremote == 0) {
1000 				(void) snmprintf(visbuf, sizeof(visbuf),
1001 				    NULL, "%s", buf + 1);
1002 				(void) atomicio(vwrite, STDERR_FILENO,
1003 				    visbuf, strlen(visbuf));
1004 			}
1005 			if (buf[0] == '\02')
1006 				exit(1);
1007 			++errs;
1008 			continue;
1009 		}
1010 		if (buf[0] == 'E') {
1011 			(void) atomicio(vwrite, remout, "", 1);
1012 			return;
1013 		}
1014 		if (ch == '\n')
1015 			*--cp = 0;
1016 
1017 		cp = buf;
1018 		if (*cp == 'T') {
1019 			setimes++;
1020 			cp++;
1021 			if (!isdigit((unsigned char)*cp))
1022 				SCREWUP("mtime.sec not present");
1023 			ull = strtoull(cp, &cp, 10);
1024 			if (!cp || *cp++ != ' ')
1025 				SCREWUP("mtime.sec not delimited");
1026 			if (TYPE_OVERFLOW(time_t, ull))
1027 				setimes = 0;	/* out of range */
1028 			mtime.tv_sec = ull;
1029 			mtime.tv_usec = strtol(cp, &cp, 10);
1030 			if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
1031 			    mtime.tv_usec > 999999)
1032 				SCREWUP("mtime.usec not delimited");
1033 			if (!isdigit((unsigned char)*cp))
1034 				SCREWUP("atime.sec not present");
1035 			ull = strtoull(cp, &cp, 10);
1036 			if (!cp || *cp++ != ' ')
1037 				SCREWUP("atime.sec not delimited");
1038 			if (TYPE_OVERFLOW(time_t, ull))
1039 				setimes = 0;	/* out of range */
1040 			atime.tv_sec = ull;
1041 			atime.tv_usec = strtol(cp, &cp, 10);
1042 			if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1043 			    atime.tv_usec > 999999)
1044 				SCREWUP("atime.usec not delimited");
1045 			(void) atomicio(vwrite, remout, "", 1);
1046 			continue;
1047 		}
1048 		if (*cp != 'C' && *cp != 'D') {
1049 			/*
1050 			 * Check for the case "rcp remote:foo\* local:bar".
1051 			 * In this case, the line "No match." can be returned
1052 			 * by the shell before the rcp command on the remote is
1053 			 * executed so the ^Aerror_message convention isn't
1054 			 * followed.
1055 			 */
1056 			if (first) {
1057 				run_err("%s", cp);
1058 				exit(1);
1059 			}
1060 			SCREWUP("expected control record");
1061 		}
1062 		mode = 0;
1063 		for (++cp; cp < buf + 5; cp++) {
1064 			if (*cp < '0' || *cp > '7')
1065 				SCREWUP("bad mode");
1066 			mode = (mode << 3) | (*cp - '0');
1067 		}
1068 		if (*cp++ != ' ')
1069 			SCREWUP("mode not delimited");
1070 
1071 		if (!isdigit((unsigned char)*cp))
1072 			SCREWUP("size not present");
1073 		ull = strtoull(cp, &cp, 10);
1074 		if (!cp || *cp++ != ' ')
1075 			SCREWUP("size not delimited");
1076 		if (TYPE_OVERFLOW(off_t, ull))
1077 			SCREWUP("size out of range");
1078 		size = (off_t)ull;
1079 
1080 		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1081 			run_err("error: unexpected filename: %s", cp);
1082 			exit(1);
1083 		}
1084 		if (targisdir) {
1085 			static char *namebuf;
1086 			static size_t cursize;
1087 			size_t need;
1088 
1089 			need = strlen(targ) + strlen(cp) + 250;
1090 			if (need > cursize) {
1091 				free(namebuf);
1092 				namebuf = xmalloc(need);
1093 				cursize = need;
1094 			}
1095 			(void) snprintf(namebuf, need, "%s%s%s", targ,
1096 			    strcmp(targ, "/") ? "/" : "", cp);
1097 			np = namebuf;
1098 		} else
1099 			np = targ;
1100 		curfile = cp;
1101 		exists = stat(np, &stb) == 0;
1102 		if (buf[0] == 'D') {
1103 			int mod_flag = pflag;
1104 			if (!iamrecursive)
1105 				SCREWUP("received directory without -r");
1106 			if (exists) {
1107 				if (!S_ISDIR(stb.st_mode)) {
1108 					errno = ENOTDIR;
1109 					goto bad;
1110 				}
1111 				if (pflag)
1112 					(void) chmod(np, mode);
1113 			} else {
1114 				/* Handle copying from a read-only
1115 				   directory */
1116 				mod_flag = 1;
1117 				if (mkdir(np, mode | S_IRWXU) < 0)
1118 					goto bad;
1119 			}
1120 			vect[0] = xstrdup(np);
1121 			sink(1, vect);
1122 			if (setimes) {
1123 				setimes = 0;
1124 				if (utimes(vect[0], tv) < 0)
1125 					run_err("%s: set times: %s",
1126 					    vect[0], strerror(errno));
1127 			}
1128 			if (mod_flag)
1129 				(void) chmod(vect[0], mode);
1130 			free(vect[0]);
1131 			continue;
1132 		}
1133 		omode = mode;
1134 		mode |= S_IWUSR;
1135 		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1136 bad:			run_err("%s: %s", np, strerror(errno));
1137 			continue;
1138 		}
1139 		(void) atomicio(vwrite, remout, "", 1);
1140 		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1141 			(void) close(ofd);
1142 			continue;
1143 		}
1144 		cp = bp->buf;
1145 		wrerr = NO;
1146 
1147 		statbytes = 0;
1148 		if (showprogress)
1149 			start_progress_meter(curfile, size, &statbytes);
1150 		set_nonblock(remin);
1151 		for (count = i = 0; i < size; i += bp->cnt) {
1152 			amt = bp->cnt;
1153 			if (i + amt > size)
1154 				amt = size - i;
1155 			count += amt;
1156 			do {
1157 				j = atomicio6(read, remin, cp, amt,
1158 				    scpio, &statbytes);
1159 				if (j == 0) {
1160 					run_err("%s", j != EPIPE ?
1161 					    strerror(errno) :
1162 					    "dropped connection");
1163 					exit(1);
1164 				}
1165 				amt -= j;
1166 				cp += j;
1167 			} while (amt > 0);
1168 
1169 			if (count == bp->cnt) {
1170 				/* Keep reading so we stay sync'd up. */
1171 				if (wrerr == NO) {
1172 					if (atomicio(vwrite, ofd, bp->buf,
1173 					    count) != count) {
1174 						wrerr = YES;
1175 						wrerrno = errno;
1176 					}
1177 				}
1178 				count = 0;
1179 				cp = bp->buf;
1180 			}
1181 		}
1182 		unset_nonblock(remin);
1183 		if (count != 0 && wrerr == NO &&
1184 		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1185 			wrerr = YES;
1186 			wrerrno = errno;
1187 		}
1188 		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1189 		    ftruncate(ofd, size) != 0) {
1190 			run_err("%s: truncate: %s", np, strerror(errno));
1191 			wrerr = DISPLAYED;
1192 		}
1193 		if (pflag) {
1194 			if (exists || omode != mode)
1195 #ifdef HAVE_FCHMOD
1196 				if (fchmod(ofd, omode)) {
1197 #else /* HAVE_FCHMOD */
1198 				if (chmod(np, omode)) {
1199 #endif /* HAVE_FCHMOD */
1200 					run_err("%s: set mode: %s",
1201 					    np, strerror(errno));
1202 					wrerr = DISPLAYED;
1203 				}
1204 		} else {
1205 			if (!exists && omode != mode)
1206 #ifdef HAVE_FCHMOD
1207 				if (fchmod(ofd, omode & ~mask)) {
1208 #else /* HAVE_FCHMOD */
1209 				if (chmod(np, omode & ~mask)) {
1210 #endif /* HAVE_FCHMOD */
1211 					run_err("%s: set mode: %s",
1212 					    np, strerror(errno));
1213 					wrerr = DISPLAYED;
1214 				}
1215 		}
1216 		if (close(ofd) == -1) {
1217 			wrerr = YES;
1218 			wrerrno = errno;
1219 		}
1220 		(void) response();
1221 		if (showprogress)
1222 			stop_progress_meter();
1223 		if (setimes && wrerr == NO) {
1224 			setimes = 0;
1225 			if (utimes(np, tv) < 0) {
1226 				run_err("%s: set times: %s",
1227 				    np, strerror(errno));
1228 				wrerr = DISPLAYED;
1229 			}
1230 		}
1231 		switch (wrerr) {
1232 		case YES:
1233 			run_err("%s: %s", np, strerror(wrerrno));
1234 			break;
1235 		case NO:
1236 			(void) atomicio(vwrite, remout, "", 1);
1237 			break;
1238 		case DISPLAYED:
1239 			break;
1240 		}
1241 	}
1242 screwup:
1243 	run_err("protocol error: %s", why);
1244 	exit(1);
1245 }
1246 
1247 int
1248 response(void)
1249 {
1250 	char ch, *cp, resp, rbuf[2048], visbuf[2048];
1251 
1252 	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1253 		lostconn(0);
1254 
1255 	cp = rbuf;
1256 	switch (resp) {
1257 	case 0:		/* ok */
1258 		return (0);
1259 	default:
1260 		*cp++ = resp;
1261 		/* FALLTHROUGH */
1262 	case 1:		/* error, followed by error msg */
1263 	case 2:		/* fatal error, "" */
1264 		do {
1265 			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1266 				lostconn(0);
1267 			*cp++ = ch;
1268 		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1269 
1270 		if (!iamremote) {
1271 			cp[-1] = '\0';
1272 			(void) snmprintf(visbuf, sizeof(visbuf),
1273 			    NULL, "%s\n", rbuf);
1274 			(void) atomicio(vwrite, STDERR_FILENO,
1275 			    visbuf, strlen(visbuf));
1276 		}
1277 		++errs;
1278 		if (resp == 1)
1279 			return (-1);
1280 		exit(1);
1281 	}
1282 	/* NOTREACHED */
1283 }
1284 
1285 void
1286 usage(void)
1287 {
1288 	(void) fprintf(stderr,
1289 	    "usage: scp [-346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1290 	    "           [-l limit] [-o ssh_option] [-P port] [-S program] source ... target\n");
1291 	exit(1);
1292 }
1293 
1294 void
1295 run_err(const char *fmt,...)
1296 {
1297 	static FILE *fp;
1298 	va_list ap;
1299 
1300 	++errs;
1301 	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1302 		(void) fprintf(fp, "%c", 0x01);
1303 		(void) fprintf(fp, "scp: ");
1304 		va_start(ap, fmt);
1305 		(void) vfprintf(fp, fmt, ap);
1306 		va_end(ap);
1307 		(void) fprintf(fp, "\n");
1308 		(void) fflush(fp);
1309 	}
1310 
1311 	if (!iamremote) {
1312 		va_start(ap, fmt);
1313 		vfmprintf(stderr, fmt, ap);
1314 		va_end(ap);
1315 		fprintf(stderr, "\n");
1316 	}
1317 }
1318 
1319 void
1320 verifydir(char *cp)
1321 {
1322 	struct stat stb;
1323 
1324 	if (!stat(cp, &stb)) {
1325 		if (S_ISDIR(stb.st_mode))
1326 			return;
1327 		errno = ENOTDIR;
1328 	}
1329 	run_err("%s: %s", cp, strerror(errno));
1330 	killchild(0);
1331 }
1332 
1333 int
1334 okname(char *cp0)
1335 {
1336 	int c;
1337 	char *cp;
1338 
1339 	cp = cp0;
1340 	do {
1341 		c = (int)*cp;
1342 		if (c & 0200)
1343 			goto bad;
1344 		if (!isalpha(c) && !isdigit((unsigned char)c)) {
1345 			switch (c) {
1346 			case '\'':
1347 			case '"':
1348 			case '`':
1349 			case ' ':
1350 			case '#':
1351 				goto bad;
1352 			default:
1353 				break;
1354 			}
1355 		}
1356 	} while (*++cp);
1357 	return (1);
1358 
1359 bad:	fmprintf(stderr, "%s: invalid user name\n", cp0);
1360 	return (0);
1361 }
1362 
1363 BUF *
1364 allocbuf(BUF *bp, int fd, int blksize)
1365 {
1366 	size_t size;
1367 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1368 	struct stat stb;
1369 
1370 	if (fstat(fd, &stb) < 0) {
1371 		run_err("fstat: %s", strerror(errno));
1372 		return (0);
1373 	}
1374 	size = ROUNDUP(stb.st_blksize, blksize);
1375 	if (size == 0)
1376 		size = blksize;
1377 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1378 	size = blksize;
1379 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1380 	if (bp->cnt >= size)
1381 		return (bp);
1382 	bp->buf = xrecallocarray(bp->buf, bp->cnt, size, 1);
1383 	bp->cnt = size;
1384 	return (bp);
1385 }
1386 
1387 void
1388 lostconn(int signo)
1389 {
1390 	if (!iamremote)
1391 		(void)write(STDERR_FILENO, "lost connection\n", 16);
1392 	if (signo)
1393 		_exit(1);
1394 	else
1395 		exit(1);
1396 }
1397