xref: /openssh-portable/scp.c (revision 9e509d4e)
1 /* $OpenBSD: scp.c,v 1.192 2017/05/31 09:15:42 deraadt 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 "atomicio.h"
116 #include "pathnames.h"
117 #include "log.h"
118 #include "misc.h"
119 #include "progressmeter.h"
120 #include "utf8.h"
121 
122 extern char *__progname;
123 
124 #define COPY_BUFLEN	16384
125 
126 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
127 int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
128 
129 /* Struct for addargs */
130 arglist args;
131 arglist remote_remote_args;
132 
133 /* Bandwidth limit */
134 long long limit_kbps = 0;
135 struct bwlimit bwlimit;
136 
137 /* Name of current file being transferred. */
138 char *curfile;
139 
140 /* This is set to non-zero to enable verbose mode. */
141 int verbose_mode = 0;
142 
143 /* This is set to zero if the progressmeter is not desired. */
144 int showprogress = 1;
145 
146 /*
147  * This is set to non-zero if remote-remote copy should be piped
148  * through this process.
149  */
150 int throughlocal = 0;
151 
152 /* This is the program to execute for the secured connection. ("ssh" or -S) */
153 char *ssh_program = _PATH_SSH_PROGRAM;
154 
155 /* This is used to store the pid of ssh_program */
156 pid_t do_cmd_pid = -1;
157 
158 static void
159 killchild(int signo)
160 {
161 	if (do_cmd_pid > 1) {
162 		kill(do_cmd_pid, signo ? signo : SIGTERM);
163 		waitpid(do_cmd_pid, NULL, 0);
164 	}
165 
166 	if (signo)
167 		_exit(1);
168 	exit(1);
169 }
170 
171 static void
172 suspchild(int signo)
173 {
174 	int status;
175 
176 	if (do_cmd_pid > 1) {
177 		kill(do_cmd_pid, signo);
178 		while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
179 		    errno == EINTR)
180 			;
181 		kill(getpid(), SIGSTOP);
182 	}
183 }
184 
185 static int
186 do_local_cmd(arglist *a)
187 {
188 	u_int i;
189 	int status;
190 	pid_t pid;
191 
192 	if (a->num == 0)
193 		fatal("do_local_cmd: no arguments");
194 
195 	if (verbose_mode) {
196 		fprintf(stderr, "Executing:");
197 		for (i = 0; i < a->num; i++)
198 			fmprintf(stderr, " %s", a->list[i]);
199 		fprintf(stderr, "\n");
200 	}
201 	if ((pid = fork()) == -1)
202 		fatal("do_local_cmd: fork: %s", strerror(errno));
203 
204 	if (pid == 0) {
205 		execvp(a->list[0], a->list);
206 		perror(a->list[0]);
207 		exit(1);
208 	}
209 
210 	do_cmd_pid = pid;
211 	signal(SIGTERM, killchild);
212 	signal(SIGINT, killchild);
213 	signal(SIGHUP, killchild);
214 
215 	while (waitpid(pid, &status, 0) == -1)
216 		if (errno != EINTR)
217 			fatal("do_local_cmd: waitpid: %s", strerror(errno));
218 
219 	do_cmd_pid = -1;
220 
221 	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
222 		return (-1);
223 
224 	return (0);
225 }
226 
227 /*
228  * This function executes the given command as the specified user on the
229  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
230  * assigns the input and output file descriptors on success.
231  */
232 
233 int
234 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
235 {
236 	int pin[2], pout[2], reserved[2];
237 
238 	if (verbose_mode)
239 		fmprintf(stderr,
240 		    "Executing: program %s host %s, user %s, command %s\n",
241 		    ssh_program, host,
242 		    remuser ? remuser : "(unspecified)", cmd);
243 
244 	/*
245 	 * Reserve two descriptors so that the real pipes won't get
246 	 * descriptors 0 and 1 because that will screw up dup2 below.
247 	 */
248 	if (pipe(reserved) < 0)
249 		fatal("pipe: %s", strerror(errno));
250 
251 	/* Create a socket pair for communicating with ssh. */
252 	if (pipe(pin) < 0)
253 		fatal("pipe: %s", strerror(errno));
254 	if (pipe(pout) < 0)
255 		fatal("pipe: %s", strerror(errno));
256 
257 	/* Free the reserved descriptors. */
258 	close(reserved[0]);
259 	close(reserved[1]);
260 
261 	signal(SIGTSTP, suspchild);
262 	signal(SIGTTIN, suspchild);
263 	signal(SIGTTOU, suspchild);
264 
265 	/* Fork a child to execute the command on the remote host using ssh. */
266 	do_cmd_pid = fork();
267 	if (do_cmd_pid == 0) {
268 		/* Child. */
269 		close(pin[1]);
270 		close(pout[0]);
271 		dup2(pin[0], 0);
272 		dup2(pout[1], 1);
273 		close(pin[0]);
274 		close(pout[1]);
275 
276 		replacearg(&args, 0, "%s", ssh_program);
277 		if (remuser != NULL) {
278 			addargs(&args, "-l");
279 			addargs(&args, "%s", remuser);
280 		}
281 		addargs(&args, "--");
282 		addargs(&args, "%s", host);
283 		addargs(&args, "%s", cmd);
284 
285 		execvp(ssh_program, args.list);
286 		perror(ssh_program);
287 		exit(1);
288 	} else if (do_cmd_pid == -1) {
289 		fatal("fork: %s", strerror(errno));
290 	}
291 	/* Parent.  Close the other side, and return the local side. */
292 	close(pin[0]);
293 	*fdout = pin[1];
294 	close(pout[1]);
295 	*fdin = pout[0];
296 	signal(SIGTERM, killchild);
297 	signal(SIGINT, killchild);
298 	signal(SIGHUP, killchild);
299 	return 0;
300 }
301 
302 /*
303  * This functions executes a command simlar to do_cmd(), but expects the
304  * input and output descriptors to be setup by a previous call to do_cmd().
305  * This way the input and output of two commands can be connected.
306  */
307 int
308 do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
309 {
310 	pid_t pid;
311 	int status;
312 
313 	if (verbose_mode)
314 		fmprintf(stderr,
315 		    "Executing: 2nd program %s host %s, user %s, command %s\n",
316 		    ssh_program, host,
317 		    remuser ? remuser : "(unspecified)", cmd);
318 
319 	/* Fork a child to execute the command on the remote host using ssh. */
320 	pid = fork();
321 	if (pid == 0) {
322 		dup2(fdin, 0);
323 		dup2(fdout, 1);
324 
325 		replacearg(&args, 0, "%s", ssh_program);
326 		if (remuser != NULL) {
327 			addargs(&args, "-l");
328 			addargs(&args, "%s", remuser);
329 		}
330 		addargs(&args, "--");
331 		addargs(&args, "%s", host);
332 		addargs(&args, "%s", cmd);
333 
334 		execvp(ssh_program, args.list);
335 		perror(ssh_program);
336 		exit(1);
337 	} else if (pid == -1) {
338 		fatal("fork: %s", strerror(errno));
339 	}
340 	while (waitpid(pid, &status, 0) == -1)
341 		if (errno != EINTR)
342 			fatal("do_cmd2: waitpid: %s", strerror(errno));
343 	return 0;
344 }
345 
346 typedef struct {
347 	size_t cnt;
348 	char *buf;
349 } BUF;
350 
351 BUF *allocbuf(BUF *, int, int);
352 void lostconn(int);
353 int okname(char *);
354 void run_err(const char *,...);
355 void verifydir(char *);
356 
357 struct passwd *pwd;
358 uid_t userid;
359 int errs, remin, remout;
360 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
361 
362 #define	CMDNEEDS	64
363 char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
364 
365 int response(void);
366 void rsource(char *, struct stat *);
367 void sink(int, char *[]);
368 void source(int, char *[]);
369 void tolocal(int, char *[]);
370 void toremote(char *, int, char *[]);
371 void usage(void);
372 
373 int
374 main(int argc, char **argv)
375 {
376 	int ch, fflag, tflag, status, n;
377 	char *targ, **newargv;
378 	const char *errstr;
379 	extern char *optarg;
380 	extern int optind;
381 
382 	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
383 	sanitise_stdfd();
384 
385 	msetlocale();
386 
387 	/* Copy argv, because we modify it */
388 	newargv = xcalloc(MAXIMUM(argc + 1, 1), sizeof(*newargv));
389 	for (n = 0; n < argc; n++)
390 		newargv[n] = xstrdup(argv[n]);
391 	argv = newargv;
392 
393 	__progname = ssh_get_progname(argv[0]);
394 
395 	memset(&args, '\0', sizeof(args));
396 	memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
397 	args.list = remote_remote_args.list = NULL;
398 	addargs(&args, "%s", ssh_program);
399 	addargs(&args, "-x");
400 	addargs(&args, "-oForwardAgent=no");
401 	addargs(&args, "-oPermitLocalCommand=no");
402 	addargs(&args, "-oClearAllForwardings=yes");
403 
404 	fflag = tflag = 0;
405 	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
406 		switch (ch) {
407 		/* User-visible flags. */
408 		case '1':
409 			fatal("SSH protocol v.1 is no longer supported");
410 			break;
411 		case '2':
412 			/* Ignored */
413 			break;
414 		case '4':
415 		case '6':
416 		case 'C':
417 			addargs(&args, "-%c", ch);
418 			addargs(&remote_remote_args, "-%c", ch);
419 			break;
420 		case '3':
421 			throughlocal = 1;
422 			break;
423 		case 'o':
424 		case 'c':
425 		case 'i':
426 		case 'F':
427 			addargs(&remote_remote_args, "-%c", ch);
428 			addargs(&remote_remote_args, "%s", optarg);
429 			addargs(&args, "-%c", ch);
430 			addargs(&args, "%s", optarg);
431 			break;
432 		case 'P':
433 			addargs(&remote_remote_args, "-p");
434 			addargs(&remote_remote_args, "%s", optarg);
435 			addargs(&args, "-p");
436 			addargs(&args, "%s", optarg);
437 			break;
438 		case 'B':
439 			addargs(&remote_remote_args, "-oBatchmode=yes");
440 			addargs(&args, "-oBatchmode=yes");
441 			break;
442 		case 'l':
443 			limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
444 			    &errstr);
445 			if (errstr != NULL)
446 				usage();
447 			limit_kbps *= 1024; /* kbps */
448 			bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
449 			break;
450 		case 'p':
451 			pflag = 1;
452 			break;
453 		case 'r':
454 			iamrecursive = 1;
455 			break;
456 		case 'S':
457 			ssh_program = xstrdup(optarg);
458 			break;
459 		case 'v':
460 			addargs(&args, "-v");
461 			addargs(&remote_remote_args, "-v");
462 			verbose_mode = 1;
463 			break;
464 		case 'q':
465 			addargs(&args, "-q");
466 			addargs(&remote_remote_args, "-q");
467 			showprogress = 0;
468 			break;
469 
470 		/* Server options. */
471 		case 'd':
472 			targetshouldbedirectory = 1;
473 			break;
474 		case 'f':	/* "from" */
475 			iamremote = 1;
476 			fflag = 1;
477 			break;
478 		case 't':	/* "to" */
479 			iamremote = 1;
480 			tflag = 1;
481 #ifdef HAVE_CYGWIN
482 			setmode(0, O_BINARY);
483 #endif
484 			break;
485 		default:
486 			usage();
487 		}
488 	argc -= optind;
489 	argv += optind;
490 
491 	if ((pwd = getpwuid(userid = getuid())) == NULL)
492 		fatal("unknown user %u", (u_int) userid);
493 
494 	if (!isatty(STDOUT_FILENO))
495 		showprogress = 0;
496 
497 	if (pflag) {
498 		/* Cannot pledge: -p allows setuid/setgid files... */
499 	} else {
500 		if (pledge("stdio rpath wpath cpath fattr tty proc exec",
501 		    NULL) == -1) {
502 			perror("pledge");
503 			exit(1);
504 		}
505 	}
506 
507 	remin = STDIN_FILENO;
508 	remout = STDOUT_FILENO;
509 
510 	if (fflag) {
511 		/* Follow "protocol", send data. */
512 		(void) response();
513 		source(argc, argv);
514 		exit(errs != 0);
515 	}
516 	if (tflag) {
517 		/* Receive data. */
518 		sink(argc, argv);
519 		exit(errs != 0);
520 	}
521 	if (argc < 2)
522 		usage();
523 	if (argc > 2)
524 		targetshouldbedirectory = 1;
525 
526 	remin = remout = -1;
527 	do_cmd_pid = -1;
528 	/* Command to be executed on remote system using "ssh". */
529 	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
530 	    verbose_mode ? " -v" : "",
531 	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
532 	    targetshouldbedirectory ? " -d" : "");
533 
534 	(void) signal(SIGPIPE, lostconn);
535 
536 	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
537 		toremote(targ, argc, argv);
538 	else {
539 		if (targetshouldbedirectory)
540 			verifydir(argv[argc - 1]);
541 		tolocal(argc, argv);	/* Dest is local host. */
542 	}
543 	/*
544 	 * Finally check the exit status of the ssh process, if one was forked
545 	 * and no error has occurred yet
546 	 */
547 	if (do_cmd_pid != -1 && errs == 0) {
548 		if (remin != -1)
549 		    (void) close(remin);
550 		if (remout != -1)
551 		    (void) close(remout);
552 		if (waitpid(do_cmd_pid, &status, 0) == -1)
553 			errs = 1;
554 		else {
555 			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
556 				errs = 1;
557 		}
558 	}
559 	exit(errs != 0);
560 }
561 
562 /* Callback from atomicio6 to update progress meter and limit bandwidth */
563 static int
564 scpio(void *_cnt, size_t s)
565 {
566 	off_t *cnt = (off_t *)_cnt;
567 
568 	*cnt += s;
569 	if (limit_kbps > 0)
570 		bandwidth_limit(&bwlimit, s);
571 	return 0;
572 }
573 
574 static int
575 do_times(int fd, int verb, const struct stat *sb)
576 {
577 	/* strlen(2^64) == 20; strlen(10^6) == 7 */
578 	char buf[(20 + 7 + 2) * 2 + 2];
579 
580 	(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
581 	    (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
582 	    (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
583 	if (verb) {
584 		fprintf(stderr, "File mtime %lld atime %lld\n",
585 		    (long long)sb->st_mtime, (long long)sb->st_atime);
586 		fprintf(stderr, "Sending file timestamps: %s", buf);
587 	}
588 	(void) atomicio(vwrite, fd, buf, strlen(buf));
589 	return (response());
590 }
591 
592 void
593 toremote(char *targ, int argc, char **argv)
594 {
595 	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
596 	arglist alist;
597 	int i;
598 	u_int j;
599 
600 	memset(&alist, '\0', sizeof(alist));
601 	alist.list = NULL;
602 
603 	*targ++ = 0;
604 	if (*targ == 0)
605 		targ = ".";
606 
607 	arg = xstrdup(argv[argc - 1]);
608 	if ((thost = strrchr(arg, '@'))) {
609 		/* user@host */
610 		*thost++ = 0;
611 		tuser = arg;
612 		if (*tuser == '\0')
613 			tuser = NULL;
614 	} else {
615 		thost = arg;
616 		tuser = NULL;
617 	}
618 
619 	if (tuser != NULL && !okname(tuser)) {
620 		free(arg);
621 		return;
622 	}
623 
624 	for (i = 0; i < argc - 1; i++) {
625 		src = colon(argv[i]);
626 		if (src && throughlocal) {	/* extended remote to remote */
627 			*src++ = 0;
628 			if (*src == 0)
629 				src = ".";
630 			host = strrchr(argv[i], '@');
631 			if (host) {
632 				*host++ = 0;
633 				host = cleanhostname(host);
634 				suser = argv[i];
635 				if (*suser == '\0')
636 					suser = pwd->pw_name;
637 				else if (!okname(suser))
638 					continue;
639 			} else {
640 				host = cleanhostname(argv[i]);
641 				suser = NULL;
642 			}
643 			xasprintf(&bp, "%s -f %s%s", cmd,
644 			    *src == '-' ? "-- " : "", src);
645 			if (do_cmd(host, suser, bp, &remin, &remout) < 0)
646 				exit(1);
647 			free(bp);
648 			host = cleanhostname(thost);
649 			xasprintf(&bp, "%s -t %s%s", cmd,
650 			    *targ == '-' ? "-- " : "", targ);
651 			if (do_cmd2(host, tuser, bp, remin, remout) < 0)
652 				exit(1);
653 			free(bp);
654 			(void) close(remin);
655 			(void) close(remout);
656 			remin = remout = -1;
657 		} else if (src) {	/* standard remote to remote */
658 			freeargs(&alist);
659 			addargs(&alist, "%s", ssh_program);
660 			addargs(&alist, "-x");
661 			addargs(&alist, "-oClearAllForwardings=yes");
662 			addargs(&alist, "-n");
663 			for (j = 0; j < remote_remote_args.num; j++) {
664 				addargs(&alist, "%s",
665 				    remote_remote_args.list[j]);
666 			}
667 			*src++ = 0;
668 			if (*src == 0)
669 				src = ".";
670 			host = strrchr(argv[i], '@');
671 
672 			if (host) {
673 				*host++ = 0;
674 				host = cleanhostname(host);
675 				suser = argv[i];
676 				if (*suser == '\0')
677 					suser = pwd->pw_name;
678 				else if (!okname(suser))
679 					continue;
680 				addargs(&alist, "-l");
681 				addargs(&alist, "%s", suser);
682 			} else {
683 				host = cleanhostname(argv[i]);
684 			}
685 			addargs(&alist, "--");
686 			addargs(&alist, "%s", host);
687 			addargs(&alist, "%s", cmd);
688 			addargs(&alist, "%s", src);
689 			addargs(&alist, "%s%s%s:%s",
690 			    tuser ? tuser : "", tuser ? "@" : "",
691 			    thost, targ);
692 			if (do_local_cmd(&alist) != 0)
693 				errs = 1;
694 		} else {	/* local to remote */
695 			if (remin == -1) {
696 				xasprintf(&bp, "%s -t %s%s", cmd,
697 				    *targ == '-' ? "-- " : "", targ);
698 				host = cleanhostname(thost);
699 				if (do_cmd(host, tuser, bp, &remin,
700 				    &remout) < 0)
701 					exit(1);
702 				if (response() < 0)
703 					exit(1);
704 				free(bp);
705 			}
706 			source(1, argv + i);
707 		}
708 	}
709 	free(arg);
710 }
711 
712 void
713 tolocal(int argc, char **argv)
714 {
715 	char *bp, *host, *src, *suser;
716 	arglist alist;
717 	int i;
718 
719 	memset(&alist, '\0', sizeof(alist));
720 	alist.list = NULL;
721 
722 	for (i = 0; i < argc - 1; i++) {
723 		if (!(src = colon(argv[i]))) {	/* Local to local. */
724 			freeargs(&alist);
725 			addargs(&alist, "%s", _PATH_CP);
726 			if (iamrecursive)
727 				addargs(&alist, "-r");
728 			if (pflag)
729 				addargs(&alist, "-p");
730 			addargs(&alist, "--");
731 			addargs(&alist, "%s", argv[i]);
732 			addargs(&alist, "%s", argv[argc-1]);
733 			if (do_local_cmd(&alist))
734 				++errs;
735 			continue;
736 		}
737 		*src++ = 0;
738 		if (*src == 0)
739 			src = ".";
740 		if ((host = strrchr(argv[i], '@')) == NULL) {
741 			host = argv[i];
742 			suser = NULL;
743 		} else {
744 			*host++ = 0;
745 			suser = argv[i];
746 			if (*suser == '\0')
747 				suser = pwd->pw_name;
748 		}
749 		host = cleanhostname(host);
750 		xasprintf(&bp, "%s -f %s%s",
751 		    cmd, *src == '-' ? "-- " : "", src);
752 		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
753 			free(bp);
754 			++errs;
755 			continue;
756 		}
757 		free(bp);
758 		sink(1, argv + argc - 1);
759 		(void) close(remin);
760 		remin = remout = -1;
761 	}
762 }
763 
764 void
765 source(int argc, char **argv)
766 {
767 	struct stat stb;
768 	static BUF buffer;
769 	BUF *bp;
770 	off_t i, statbytes;
771 	size_t amt, nr;
772 	int fd = -1, haderr, indx;
773 	char *last, *name, buf[2048], encname[PATH_MAX];
774 	int len;
775 
776 	for (indx = 0; indx < argc; ++indx) {
777 		name = argv[indx];
778 		statbytes = 0;
779 		len = strlen(name);
780 		while (len > 1 && name[len-1] == '/')
781 			name[--len] = '\0';
782 		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
783 			goto syserr;
784 		if (strchr(name, '\n') != NULL) {
785 			strnvis(encname, name, sizeof(encname), VIS_NL);
786 			name = encname;
787 		}
788 		if (fstat(fd, &stb) < 0) {
789 syserr:			run_err("%s: %s", name, strerror(errno));
790 			goto next;
791 		}
792 		if (stb.st_size < 0) {
793 			run_err("%s: %s", name, "Negative file size");
794 			goto next;
795 		}
796 		unset_nonblock(fd);
797 		switch (stb.st_mode & S_IFMT) {
798 		case S_IFREG:
799 			break;
800 		case S_IFDIR:
801 			if (iamrecursive) {
802 				rsource(name, &stb);
803 				goto next;
804 			}
805 			/* FALLTHROUGH */
806 		default:
807 			run_err("%s: not a regular file", name);
808 			goto next;
809 		}
810 		if ((last = strrchr(name, '/')) == NULL)
811 			last = name;
812 		else
813 			++last;
814 		curfile = last;
815 		if (pflag) {
816 			if (do_times(remout, verbose_mode, &stb) < 0)
817 				goto next;
818 		}
819 #define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
820 		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
821 		    (u_int) (stb.st_mode & FILEMODEMASK),
822 		    (long long)stb.st_size, last);
823 		if (verbose_mode)
824 			fmprintf(stderr, "Sending file modes: %s", buf);
825 		(void) atomicio(vwrite, remout, buf, strlen(buf));
826 		if (response() < 0)
827 			goto next;
828 		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
829 next:			if (fd != -1) {
830 				(void) close(fd);
831 				fd = -1;
832 			}
833 			continue;
834 		}
835 		if (showprogress)
836 			start_progress_meter(curfile, stb.st_size, &statbytes);
837 		set_nonblock(remout);
838 		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
839 			amt = bp->cnt;
840 			if (i + (off_t)amt > stb.st_size)
841 				amt = stb.st_size - i;
842 			if (!haderr) {
843 				if ((nr = atomicio(read, fd,
844 				    bp->buf, amt)) != amt) {
845 					haderr = errno;
846 					memset(bp->buf + nr, 0, amt - nr);
847 				}
848 			}
849 			/* Keep writing after error to retain sync */
850 			if (haderr) {
851 				(void)atomicio(vwrite, remout, bp->buf, amt);
852 				memset(bp->buf, 0, amt);
853 				continue;
854 			}
855 			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
856 			    &statbytes) != amt)
857 				haderr = errno;
858 		}
859 		unset_nonblock(remout);
860 
861 		if (fd != -1) {
862 			if (close(fd) < 0 && !haderr)
863 				haderr = errno;
864 			fd = -1;
865 		}
866 		if (!haderr)
867 			(void) atomicio(vwrite, remout, "", 1);
868 		else
869 			run_err("%s: %s", name, strerror(haderr));
870 		(void) response();
871 		if (showprogress)
872 			stop_progress_meter();
873 	}
874 }
875 
876 void
877 rsource(char *name, struct stat *statp)
878 {
879 	DIR *dirp;
880 	struct dirent *dp;
881 	char *last, *vect[1], path[PATH_MAX];
882 
883 	if (!(dirp = opendir(name))) {
884 		run_err("%s: %s", name, strerror(errno));
885 		return;
886 	}
887 	last = strrchr(name, '/');
888 	if (last == NULL)
889 		last = name;
890 	else
891 		last++;
892 	if (pflag) {
893 		if (do_times(remout, verbose_mode, statp) < 0) {
894 			closedir(dirp);
895 			return;
896 		}
897 	}
898 	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
899 	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
900 	if (verbose_mode)
901 		fmprintf(stderr, "Entering directory: %s", path);
902 	(void) atomicio(vwrite, remout, path, strlen(path));
903 	if (response() < 0) {
904 		closedir(dirp);
905 		return;
906 	}
907 	while ((dp = readdir(dirp)) != NULL) {
908 		if (dp->d_ino == 0)
909 			continue;
910 		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
911 			continue;
912 		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
913 			run_err("%s/%s: name too long", name, dp->d_name);
914 			continue;
915 		}
916 		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
917 		vect[0] = path;
918 		source(1, vect);
919 	}
920 	(void) closedir(dirp);
921 	(void) atomicio(vwrite, remout, "E\n", 2);
922 	(void) response();
923 }
924 
925 #define TYPE_OVERFLOW(type, val) \
926 	((sizeof(type) == 4 && (val) > INT32_MAX) || \
927 	 (sizeof(type) == 8 && (val) > INT64_MAX) || \
928 	 (sizeof(type) != 4 && sizeof(type) != 8))
929 
930 void
931 sink(int argc, char **argv)
932 {
933 	static BUF buffer;
934 	struct stat stb;
935 	enum {
936 		YES, NO, DISPLAYED
937 	} wrerr;
938 	BUF *bp;
939 	off_t i;
940 	size_t j, count;
941 	int amt, exists, first, ofd;
942 	mode_t mode, omode, mask;
943 	off_t size, statbytes;
944 	unsigned long long ull;
945 	int setimes, targisdir, wrerrno = 0;
946 	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
947 	struct timeval tv[2];
948 
949 #define	atime	tv[0]
950 #define	mtime	tv[1]
951 #define	SCREWUP(str)	{ why = str; goto screwup; }
952 
953 	if (TYPE_OVERFLOW(time_t, 0) || TYPE_OVERFLOW(off_t, 0))
954 		SCREWUP("Unexpected off_t/time_t size");
955 
956 	setimes = targisdir = 0;
957 	mask = umask(0);
958 	if (!pflag)
959 		(void) umask(mask);
960 	if (argc != 1) {
961 		run_err("ambiguous target");
962 		exit(1);
963 	}
964 	targ = *argv;
965 	if (targetshouldbedirectory)
966 		verifydir(targ);
967 
968 	(void) atomicio(vwrite, remout, "", 1);
969 	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
970 		targisdir = 1;
971 	for (first = 1;; first = 0) {
972 		cp = buf;
973 		if (atomicio(read, remin, cp, 1) != 1)
974 			return;
975 		if (*cp++ == '\n')
976 			SCREWUP("unexpected <newline>");
977 		do {
978 			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
979 				SCREWUP("lost connection");
980 			*cp++ = ch;
981 		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
982 		*cp = 0;
983 		if (verbose_mode)
984 			fmprintf(stderr, "Sink: %s", buf);
985 
986 		if (buf[0] == '\01' || buf[0] == '\02') {
987 			if (iamremote == 0) {
988 				(void) snmprintf(visbuf, sizeof(visbuf),
989 				    NULL, "%s", buf + 1);
990 				(void) atomicio(vwrite, STDERR_FILENO,
991 				    visbuf, strlen(visbuf));
992 			}
993 			if (buf[0] == '\02')
994 				exit(1);
995 			++errs;
996 			continue;
997 		}
998 		if (buf[0] == 'E') {
999 			(void) atomicio(vwrite, remout, "", 1);
1000 			return;
1001 		}
1002 		if (ch == '\n')
1003 			*--cp = 0;
1004 
1005 		cp = buf;
1006 		if (*cp == 'T') {
1007 			setimes++;
1008 			cp++;
1009 			if (!isdigit((unsigned char)*cp))
1010 				SCREWUP("mtime.sec not present");
1011 			ull = strtoull(cp, &cp, 10);
1012 			if (!cp || *cp++ != ' ')
1013 				SCREWUP("mtime.sec not delimited");
1014 			if (TYPE_OVERFLOW(time_t, ull))
1015 				setimes = 0;	/* out of range */
1016 			mtime.tv_sec = ull;
1017 			mtime.tv_usec = strtol(cp, &cp, 10);
1018 			if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
1019 			    mtime.tv_usec > 999999)
1020 				SCREWUP("mtime.usec not delimited");
1021 			if (!isdigit((unsigned char)*cp))
1022 				SCREWUP("atime.sec not present");
1023 			ull = strtoull(cp, &cp, 10);
1024 			if (!cp || *cp++ != ' ')
1025 				SCREWUP("atime.sec not delimited");
1026 			if (TYPE_OVERFLOW(time_t, ull))
1027 				setimes = 0;	/* out of range */
1028 			atime.tv_sec = ull;
1029 			atime.tv_usec = strtol(cp, &cp, 10);
1030 			if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1031 			    atime.tv_usec > 999999)
1032 				SCREWUP("atime.usec not delimited");
1033 			(void) atomicio(vwrite, remout, "", 1);
1034 			continue;
1035 		}
1036 		if (*cp != 'C' && *cp != 'D') {
1037 			/*
1038 			 * Check for the case "rcp remote:foo\* local:bar".
1039 			 * In this case, the line "No match." can be returned
1040 			 * by the shell before the rcp command on the remote is
1041 			 * executed so the ^Aerror_message convention isn't
1042 			 * followed.
1043 			 */
1044 			if (first) {
1045 				run_err("%s", cp);
1046 				exit(1);
1047 			}
1048 			SCREWUP("expected control record");
1049 		}
1050 		mode = 0;
1051 		for (++cp; cp < buf + 5; cp++) {
1052 			if (*cp < '0' || *cp > '7')
1053 				SCREWUP("bad mode");
1054 			mode = (mode << 3) | (*cp - '0');
1055 		}
1056 		if (*cp++ != ' ')
1057 			SCREWUP("mode not delimited");
1058 
1059 		if (!isdigit((unsigned char)*cp))
1060 			SCREWUP("size not present");
1061 		ull = strtoull(cp, &cp, 10);
1062 		if (!cp || *cp++ != ' ')
1063 			SCREWUP("size not delimited");
1064 		if (TYPE_OVERFLOW(off_t, ull))
1065 			SCREWUP("size out of range");
1066 		size = (off_t)ull;
1067 
1068 		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1069 			run_err("error: unexpected filename: %s", cp);
1070 			exit(1);
1071 		}
1072 		if (targisdir) {
1073 			static char *namebuf;
1074 			static size_t cursize;
1075 			size_t need;
1076 
1077 			need = strlen(targ) + strlen(cp) + 250;
1078 			if (need > cursize) {
1079 				free(namebuf);
1080 				namebuf = xmalloc(need);
1081 				cursize = need;
1082 			}
1083 			(void) snprintf(namebuf, need, "%s%s%s", targ,
1084 			    strcmp(targ, "/") ? "/" : "", cp);
1085 			np = namebuf;
1086 		} else
1087 			np = targ;
1088 		curfile = cp;
1089 		exists = stat(np, &stb) == 0;
1090 		if (buf[0] == 'D') {
1091 			int mod_flag = pflag;
1092 			if (!iamrecursive)
1093 				SCREWUP("received directory without -r");
1094 			if (exists) {
1095 				if (!S_ISDIR(stb.st_mode)) {
1096 					errno = ENOTDIR;
1097 					goto bad;
1098 				}
1099 				if (pflag)
1100 					(void) chmod(np, mode);
1101 			} else {
1102 				/* Handle copying from a read-only
1103 				   directory */
1104 				mod_flag = 1;
1105 				if (mkdir(np, mode | S_IRWXU) < 0)
1106 					goto bad;
1107 			}
1108 			vect[0] = xstrdup(np);
1109 			sink(1, vect);
1110 			if (setimes) {
1111 				setimes = 0;
1112 				if (utimes(vect[0], tv) < 0)
1113 					run_err("%s: set times: %s",
1114 					    vect[0], strerror(errno));
1115 			}
1116 			if (mod_flag)
1117 				(void) chmod(vect[0], mode);
1118 			free(vect[0]);
1119 			continue;
1120 		}
1121 		omode = mode;
1122 		mode |= S_IWUSR;
1123 		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1124 bad:			run_err("%s: %s", np, strerror(errno));
1125 			continue;
1126 		}
1127 		(void) atomicio(vwrite, remout, "", 1);
1128 		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1129 			(void) close(ofd);
1130 			continue;
1131 		}
1132 		cp = bp->buf;
1133 		wrerr = NO;
1134 
1135 		statbytes = 0;
1136 		if (showprogress)
1137 			start_progress_meter(curfile, size, &statbytes);
1138 		set_nonblock(remin);
1139 		for (count = i = 0; i < size; i += bp->cnt) {
1140 			amt = bp->cnt;
1141 			if (i + amt > size)
1142 				amt = size - i;
1143 			count += amt;
1144 			do {
1145 				j = atomicio6(read, remin, cp, amt,
1146 				    scpio, &statbytes);
1147 				if (j == 0) {
1148 					run_err("%s", j != EPIPE ?
1149 					    strerror(errno) :
1150 					    "dropped connection");
1151 					exit(1);
1152 				}
1153 				amt -= j;
1154 				cp += j;
1155 			} while (amt > 0);
1156 
1157 			if (count == bp->cnt) {
1158 				/* Keep reading so we stay sync'd up. */
1159 				if (wrerr == NO) {
1160 					if (atomicio(vwrite, ofd, bp->buf,
1161 					    count) != count) {
1162 						wrerr = YES;
1163 						wrerrno = errno;
1164 					}
1165 				}
1166 				count = 0;
1167 				cp = bp->buf;
1168 			}
1169 		}
1170 		unset_nonblock(remin);
1171 		if (count != 0 && wrerr == NO &&
1172 		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1173 			wrerr = YES;
1174 			wrerrno = errno;
1175 		}
1176 		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1177 		    ftruncate(ofd, size) != 0) {
1178 			run_err("%s: truncate: %s", np, strerror(errno));
1179 			wrerr = DISPLAYED;
1180 		}
1181 		if (pflag) {
1182 			if (exists || omode != mode)
1183 #ifdef HAVE_FCHMOD
1184 				if (fchmod(ofd, omode)) {
1185 #else /* HAVE_FCHMOD */
1186 				if (chmod(np, omode)) {
1187 #endif /* HAVE_FCHMOD */
1188 					run_err("%s: set mode: %s",
1189 					    np, strerror(errno));
1190 					wrerr = DISPLAYED;
1191 				}
1192 		} else {
1193 			if (!exists && omode != mode)
1194 #ifdef HAVE_FCHMOD
1195 				if (fchmod(ofd, omode & ~mask)) {
1196 #else /* HAVE_FCHMOD */
1197 				if (chmod(np, omode & ~mask)) {
1198 #endif /* HAVE_FCHMOD */
1199 					run_err("%s: set mode: %s",
1200 					    np, strerror(errno));
1201 					wrerr = DISPLAYED;
1202 				}
1203 		}
1204 		if (close(ofd) == -1) {
1205 			wrerr = YES;
1206 			wrerrno = errno;
1207 		}
1208 		(void) response();
1209 		if (showprogress)
1210 			stop_progress_meter();
1211 		if (setimes && wrerr == NO) {
1212 			setimes = 0;
1213 			if (utimes(np, tv) < 0) {
1214 				run_err("%s: set times: %s",
1215 				    np, strerror(errno));
1216 				wrerr = DISPLAYED;
1217 			}
1218 		}
1219 		switch (wrerr) {
1220 		case YES:
1221 			run_err("%s: %s", np, strerror(wrerrno));
1222 			break;
1223 		case NO:
1224 			(void) atomicio(vwrite, remout, "", 1);
1225 			break;
1226 		case DISPLAYED:
1227 			break;
1228 		}
1229 	}
1230 screwup:
1231 	run_err("protocol error: %s", why);
1232 	exit(1);
1233 }
1234 
1235 int
1236 response(void)
1237 {
1238 	char ch, *cp, resp, rbuf[2048], visbuf[2048];
1239 
1240 	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1241 		lostconn(0);
1242 
1243 	cp = rbuf;
1244 	switch (resp) {
1245 	case 0:		/* ok */
1246 		return (0);
1247 	default:
1248 		*cp++ = resp;
1249 		/* FALLTHROUGH */
1250 	case 1:		/* error, followed by error msg */
1251 	case 2:		/* fatal error, "" */
1252 		do {
1253 			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1254 				lostconn(0);
1255 			*cp++ = ch;
1256 		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1257 
1258 		if (!iamremote) {
1259 			cp[-1] = '\0';
1260 			(void) snmprintf(visbuf, sizeof(visbuf),
1261 			    NULL, "%s\n", rbuf);
1262 			(void) atomicio(vwrite, STDERR_FILENO,
1263 			    visbuf, strlen(visbuf));
1264 		}
1265 		++errs;
1266 		if (resp == 1)
1267 			return (-1);
1268 		exit(1);
1269 	}
1270 	/* NOTREACHED */
1271 }
1272 
1273 void
1274 usage(void)
1275 {
1276 	(void) fprintf(stderr,
1277 	    "usage: scp [-346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1278 	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1279 	    "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1280 	exit(1);
1281 }
1282 
1283 void
1284 run_err(const char *fmt,...)
1285 {
1286 	static FILE *fp;
1287 	va_list ap;
1288 
1289 	++errs;
1290 	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1291 		(void) fprintf(fp, "%c", 0x01);
1292 		(void) fprintf(fp, "scp: ");
1293 		va_start(ap, fmt);
1294 		(void) vfprintf(fp, fmt, ap);
1295 		va_end(ap);
1296 		(void) fprintf(fp, "\n");
1297 		(void) fflush(fp);
1298 	}
1299 
1300 	if (!iamremote) {
1301 		va_start(ap, fmt);
1302 		vfmprintf(stderr, fmt, ap);
1303 		va_end(ap);
1304 		fprintf(stderr, "\n");
1305 	}
1306 }
1307 
1308 void
1309 verifydir(char *cp)
1310 {
1311 	struct stat stb;
1312 
1313 	if (!stat(cp, &stb)) {
1314 		if (S_ISDIR(stb.st_mode))
1315 			return;
1316 		errno = ENOTDIR;
1317 	}
1318 	run_err("%s: %s", cp, strerror(errno));
1319 	killchild(0);
1320 }
1321 
1322 int
1323 okname(char *cp0)
1324 {
1325 	int c;
1326 	char *cp;
1327 
1328 	cp = cp0;
1329 	do {
1330 		c = (int)*cp;
1331 		if (c & 0200)
1332 			goto bad;
1333 		if (!isalpha(c) && !isdigit((unsigned char)c)) {
1334 			switch (c) {
1335 			case '\'':
1336 			case '"':
1337 			case '`':
1338 			case ' ':
1339 			case '#':
1340 				goto bad;
1341 			default:
1342 				break;
1343 			}
1344 		}
1345 	} while (*++cp);
1346 	return (1);
1347 
1348 bad:	fmprintf(stderr, "%s: invalid user name\n", cp0);
1349 	return (0);
1350 }
1351 
1352 BUF *
1353 allocbuf(BUF *bp, int fd, int blksize)
1354 {
1355 	size_t size;
1356 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1357 	struct stat stb;
1358 
1359 	if (fstat(fd, &stb) < 0) {
1360 		run_err("fstat: %s", strerror(errno));
1361 		return (0);
1362 	}
1363 	size = ROUNDUP(stb.st_blksize, blksize);
1364 	if (size == 0)
1365 		size = blksize;
1366 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1367 	size = blksize;
1368 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1369 	if (bp->cnt >= size)
1370 		return (bp);
1371 	bp->buf = xrecallocarray(bp->buf, bp->cnt, size, 1);
1372 	bp->cnt = size;
1373 	return (bp);
1374 }
1375 
1376 void
1377 lostconn(int signo)
1378 {
1379 	if (!iamremote)
1380 		(void)write(STDERR_FILENO, "lost connection\n", 16);
1381 	if (signo)
1382 		_exit(1);
1383 	else
1384 		exit(1);
1385 }
1386