xref: /openbsd-src/usr.bin/ssh/scp.c (revision 898184e3e61f9129feb5978fad5a8c6865f00b92) 
1 /* $OpenBSD: scp.c,v 1.171 2011/09/09 22:37:01 djm 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 <sys/param.h>
75 #include <sys/types.h>
76 #include <sys/poll.h>
77 #include <sys/wait.h>
78 #include <sys/stat.h>
79 #include <sys/time.h>
80 #include <sys/uio.h>
81 
82 #include <ctype.h>
83 #include <dirent.h>
84 #include <errno.h>
85 #include <fcntl.h>
86 #include <pwd.h>
87 #include <signal.h>
88 #include <stdarg.h>
89 #include <stdio.h>
90 #include <stdlib.h>
91 #include <string.h>
92 #include <time.h>
93 #include <unistd.h>
94 #include <vis.h>
95 
96 #include "xmalloc.h"
97 #include "atomicio.h"
98 #include "pathnames.h"
99 #include "log.h"
100 #include "misc.h"
101 #include "progressmeter.h"
102 
103 #define COPY_BUFLEN	16384
104 
105 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
106 int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
107 
108 /* Struct for addargs */
109 arglist args;
110 arglist remote_remote_args;
111 
112 /* Bandwidth limit */
113 long long limit_kbps = 0;
114 struct bwlimit bwlimit;
115 
116 /* Name of current file being transferred. */
117 char *curfile;
118 
119 /* This is set to non-zero to enable verbose mode. */
120 int verbose_mode = 0;
121 
122 /* This is set to zero if the progressmeter is not desired. */
123 int showprogress = 1;
124 
125 /*
126  * This is set to non-zero if remote-remote copy should be piped
127  * through this process.
128  */
129 int throughlocal = 0;
130 
131 /* This is the program to execute for the secured connection. ("ssh" or -S) */
132 char *ssh_program = _PATH_SSH_PROGRAM;
133 
134 /* This is used to store the pid of ssh_program */
135 pid_t do_cmd_pid = -1;
136 
137 static void
138 killchild(int signo)
139 {
140 	if (do_cmd_pid > 1) {
141 		kill(do_cmd_pid, signo ? signo : SIGTERM);
142 		waitpid(do_cmd_pid, NULL, 0);
143 	}
144 
145 	if (signo)
146 		_exit(1);
147 	exit(1);
148 }
149 
150 static void
151 suspchild(int signo)
152 {
153 	int status;
154 
155 	if (do_cmd_pid > 1) {
156 		kill(do_cmd_pid, signo);
157 		while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
158 		    errno == EINTR)
159 			;
160 		kill(getpid(), SIGSTOP);
161 	}
162 }
163 
164 static int
165 do_local_cmd(arglist *a)
166 {
167 	u_int i;
168 	int status;
169 	pid_t pid;
170 
171 	if (a->num == 0)
172 		fatal("do_local_cmd: no arguments");
173 
174 	if (verbose_mode) {
175 		fprintf(stderr, "Executing:");
176 		for (i = 0; i < a->num; i++)
177 			fprintf(stderr, " %s", a->list[i]);
178 		fprintf(stderr, "\n");
179 	}
180 	if ((pid = fork()) == -1)
181 		fatal("do_local_cmd: fork: %s", strerror(errno));
182 
183 	if (pid == 0) {
184 		execvp(a->list[0], a->list);
185 		perror(a->list[0]);
186 		exit(1);
187 	}
188 
189 	do_cmd_pid = pid;
190 	signal(SIGTERM, killchild);
191 	signal(SIGINT, killchild);
192 	signal(SIGHUP, killchild);
193 
194 	while (waitpid(pid, &status, 0) == -1)
195 		if (errno != EINTR)
196 			fatal("do_local_cmd: waitpid: %s", strerror(errno));
197 
198 	do_cmd_pid = -1;
199 
200 	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
201 		return (-1);
202 
203 	return (0);
204 }
205 
206 /*
207  * This function executes the given command as the specified user on the
208  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
209  * assigns the input and output file descriptors on success.
210  */
211 
212 int
213 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
214 {
215 	int pin[2], pout[2], reserved[2];
216 
217 	if (verbose_mode)
218 		fprintf(stderr,
219 		    "Executing: program %s host %s, user %s, command %s\n",
220 		    ssh_program, host,
221 		    remuser ? remuser : "(unspecified)", cmd);
222 
223 	/*
224 	 * Reserve two descriptors so that the real pipes won't get
225 	 * descriptors 0 and 1 because that will screw up dup2 below.
226 	 */
227 	if (pipe(reserved) < 0)
228 		fatal("pipe: %s", strerror(errno));
229 
230 	/* Create a socket pair for communicating with ssh. */
231 	if (pipe(pin) < 0)
232 		fatal("pipe: %s", strerror(errno));
233 	if (pipe(pout) < 0)
234 		fatal("pipe: %s", strerror(errno));
235 
236 	/* Free the reserved descriptors. */
237 	close(reserved[0]);
238 	close(reserved[1]);
239 
240 	signal(SIGTSTP, suspchild);
241 	signal(SIGTTIN, suspchild);
242 	signal(SIGTTOU, suspchild);
243 
244 	/* Fork a child to execute the command on the remote host using ssh. */
245 	do_cmd_pid = fork();
246 	if (do_cmd_pid == 0) {
247 		/* Child. */
248 		close(pin[1]);
249 		close(pout[0]);
250 		dup2(pin[0], 0);
251 		dup2(pout[1], 1);
252 		close(pin[0]);
253 		close(pout[1]);
254 
255 		replacearg(&args, 0, "%s", ssh_program);
256 		if (remuser != NULL) {
257 			addargs(&args, "-l");
258 			addargs(&args, "%s", remuser);
259 		}
260 		addargs(&args, "--");
261 		addargs(&args, "%s", host);
262 		addargs(&args, "%s", cmd);
263 
264 		execvp(ssh_program, args.list);
265 		perror(ssh_program);
266 		exit(1);
267 	} else if (do_cmd_pid == -1) {
268 		fatal("fork: %s", strerror(errno));
269 	}
270 	/* Parent.  Close the other side, and return the local side. */
271 	close(pin[0]);
272 	*fdout = pin[1];
273 	close(pout[1]);
274 	*fdin = pout[0];
275 	signal(SIGTERM, killchild);
276 	signal(SIGINT, killchild);
277 	signal(SIGHUP, killchild);
278 	return 0;
279 }
280 
281 /*
282  * This functions executes a command simlar to do_cmd(), but expects the
283  * input and output descriptors to be setup by a previous call to do_cmd().
284  * This way the input and output of two commands can be connected.
285  */
286 int
287 do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
288 {
289 	pid_t pid;
290 	int status;
291 
292 	if (verbose_mode)
293 		fprintf(stderr,
294 		    "Executing: 2nd program %s host %s, user %s, command %s\n",
295 		    ssh_program, host,
296 		    remuser ? remuser : "(unspecified)", cmd);
297 
298 	/* Fork a child to execute the command on the remote host using ssh. */
299 	pid = fork();
300 	if (pid == 0) {
301 		dup2(fdin, 0);
302 		dup2(fdout, 1);
303 
304 		replacearg(&args, 0, "%s", ssh_program);
305 		if (remuser != NULL) {
306 			addargs(&args, "-l");
307 			addargs(&args, "%s", remuser);
308 		}
309 		addargs(&args, "--");
310 		addargs(&args, "%s", host);
311 		addargs(&args, "%s", cmd);
312 
313 		execvp(ssh_program, args.list);
314 		perror(ssh_program);
315 		exit(1);
316 	} else if (pid == -1) {
317 		fatal("fork: %s", strerror(errno));
318 	}
319 	while (waitpid(pid, &status, 0) == -1)
320 		if (errno != EINTR)
321 			fatal("do_cmd2: waitpid: %s", strerror(errno));
322 	return 0;
323 }
324 
325 typedef struct {
326 	size_t cnt;
327 	char *buf;
328 } BUF;
329 
330 BUF *allocbuf(BUF *, int, int);
331 void lostconn(int);
332 int okname(char *);
333 void run_err(const char *,...);
334 void verifydir(char *);
335 
336 struct passwd *pwd;
337 uid_t userid;
338 int errs, remin, remout;
339 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
340 
341 #define	CMDNEEDS	64
342 char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
343 
344 int response(void);
345 void rsource(char *, struct stat *);
346 void sink(int, char *[]);
347 void source(int, char *[]);
348 void tolocal(int, char *[]);
349 void toremote(char *, int, char *[]);
350 void usage(void);
351 
352 int
353 main(int argc, char **argv)
354 {
355 	int ch, fflag, tflag, status, n;
356 	char *targ, **newargv;
357 	const char *errstr;
358 	extern char *optarg;
359 	extern int optind;
360 
361 	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
362 	sanitise_stdfd();
363 
364 	/* Copy argv, because we modify it */
365 	newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
366 	for (n = 0; n < argc; n++)
367 		newargv[n] = xstrdup(argv[n]);
368 	argv = newargv;
369 
370 	memset(&args, '\0', sizeof(args));
371 	memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
372 	args.list = remote_remote_args.list = NULL;
373 	addargs(&args, "%s", ssh_program);
374 	addargs(&args, "-x");
375 	addargs(&args, "-oForwardAgent=no");
376 	addargs(&args, "-oPermitLocalCommand=no");
377 	addargs(&args, "-oClearAllForwardings=yes");
378 
379 	fflag = tflag = 0;
380 	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
381 		switch (ch) {
382 		/* User-visible flags. */
383 		case '1':
384 		case '2':
385 		case '4':
386 		case '6':
387 		case 'C':
388 			addargs(&args, "-%c", ch);
389 			addargs(&remote_remote_args, "-%c", ch);
390 			break;
391 		case '3':
392 			throughlocal = 1;
393 			break;
394 		case 'o':
395 		case 'c':
396 		case 'i':
397 		case 'F':
398 			addargs(&remote_remote_args, "-%c", ch);
399 			addargs(&remote_remote_args, "%s", optarg);
400 			addargs(&args, "-%c", ch);
401 			addargs(&args, "%s", optarg);
402 			break;
403 		case 'P':
404 			addargs(&remote_remote_args, "-p");
405 			addargs(&remote_remote_args, "%s", optarg);
406 			addargs(&args, "-p");
407 			addargs(&args, "%s", optarg);
408 			break;
409 		case 'B':
410 			addargs(&remote_remote_args, "-oBatchmode=yes");
411 			addargs(&args, "-oBatchmode=yes");
412 			break;
413 		case 'l':
414 			limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
415 			    &errstr);
416 			if (errstr != NULL)
417 				usage();
418 			limit_kbps *= 1024; /* kbps */
419 			bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
420 			break;
421 		case 'p':
422 			pflag = 1;
423 			break;
424 		case 'r':
425 			iamrecursive = 1;
426 			break;
427 		case 'S':
428 			ssh_program = xstrdup(optarg);
429 			break;
430 		case 'v':
431 			addargs(&args, "-v");
432 			addargs(&remote_remote_args, "-v");
433 			verbose_mode = 1;
434 			break;
435 		case 'q':
436 			addargs(&args, "-q");
437 			addargs(&remote_remote_args, "-q");
438 			showprogress = 0;
439 			break;
440 
441 		/* Server options. */
442 		case 'd':
443 			targetshouldbedirectory = 1;
444 			break;
445 		case 'f':	/* "from" */
446 			iamremote = 1;
447 			fflag = 1;
448 			break;
449 		case 't':	/* "to" */
450 			iamremote = 1;
451 			tflag = 1;
452 			break;
453 		default:
454 			usage();
455 		}
456 	argc -= optind;
457 	argv += optind;
458 
459 	if ((pwd = getpwuid(userid = getuid())) == NULL)
460 		fatal("unknown user %u", (u_int) userid);
461 
462 	if (!isatty(STDOUT_FILENO))
463 		showprogress = 0;
464 
465 	remin = STDIN_FILENO;
466 	remout = STDOUT_FILENO;
467 
468 	if (fflag) {
469 		/* Follow "protocol", send data. */
470 		(void) response();
471 		source(argc, argv);
472 		exit(errs != 0);
473 	}
474 	if (tflag) {
475 		/* Receive data. */
476 		sink(argc, argv);
477 		exit(errs != 0);
478 	}
479 	if (argc < 2)
480 		usage();
481 	if (argc > 2)
482 		targetshouldbedirectory = 1;
483 
484 	remin = remout = -1;
485 	do_cmd_pid = -1;
486 	/* Command to be executed on remote system using "ssh". */
487 	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
488 	    verbose_mode ? " -v" : "",
489 	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
490 	    targetshouldbedirectory ? " -d" : "");
491 
492 	(void) signal(SIGPIPE, lostconn);
493 
494 	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
495 		toremote(targ, argc, argv);
496 	else {
497 		if (targetshouldbedirectory)
498 			verifydir(argv[argc - 1]);
499 		tolocal(argc, argv);	/* Dest is local host. */
500 	}
501 	/*
502 	 * Finally check the exit status of the ssh process, if one was forked
503 	 * and no error has occurred yet
504 	 */
505 	if (do_cmd_pid != -1 && errs == 0) {
506 		if (remin != -1)
507 		    (void) close(remin);
508 		if (remout != -1)
509 		    (void) close(remout);
510 		if (waitpid(do_cmd_pid, &status, 0) == -1)
511 			errs = 1;
512 		else {
513 			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
514 				errs = 1;
515 		}
516 	}
517 	exit(errs != 0);
518 }
519 
520 /* Callback from atomicio6 to update progress meter and limit bandwidth */
521 static int
522 scpio(void *_cnt, size_t s)
523 {
524 	off_t *cnt = (off_t *)_cnt;
525 
526 	*cnt += s;
527 	if (limit_kbps > 0)
528 		bandwidth_limit(&bwlimit, s);
529 	return 0;
530 }
531 
532 void
533 toremote(char *targ, int argc, char **argv)
534 {
535 	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
536 	arglist alist;
537 	int i;
538 	u_int j;
539 
540 	memset(&alist, '\0', sizeof(alist));
541 	alist.list = NULL;
542 
543 	*targ++ = 0;
544 	if (*targ == 0)
545 		targ = ".";
546 
547 	arg = xstrdup(argv[argc - 1]);
548 	if ((thost = strrchr(arg, '@'))) {
549 		/* user@host */
550 		*thost++ = 0;
551 		tuser = arg;
552 		if (*tuser == '\0')
553 			tuser = NULL;
554 	} else {
555 		thost = arg;
556 		tuser = NULL;
557 	}
558 
559 	if (tuser != NULL && !okname(tuser)) {
560 		xfree(arg);
561 		return;
562 	}
563 
564 	for (i = 0; i < argc - 1; i++) {
565 		src = colon(argv[i]);
566 		if (src && throughlocal) {	/* extended remote to remote */
567 			*src++ = 0;
568 			if (*src == 0)
569 				src = ".";
570 			host = strrchr(argv[i], '@');
571 			if (host) {
572 				*host++ = 0;
573 				host = cleanhostname(host);
574 				suser = argv[i];
575 				if (*suser == '\0')
576 					suser = pwd->pw_name;
577 				else if (!okname(suser))
578 					continue;
579 			} else {
580 				host = cleanhostname(argv[i]);
581 				suser = NULL;
582 			}
583 			xasprintf(&bp, "%s -f %s%s", cmd,
584 			    *src == '-' ? "-- " : "", src);
585 			if (do_cmd(host, suser, bp, &remin, &remout) < 0)
586 				exit(1);
587 			(void) xfree(bp);
588 			host = cleanhostname(thost);
589 			xasprintf(&bp, "%s -t %s%s", cmd,
590 			    *targ == '-' ? "-- " : "", targ);
591 			if (do_cmd2(host, tuser, bp, remin, remout) < 0)
592 				exit(1);
593 			(void) xfree(bp);
594 			(void) close(remin);
595 			(void) close(remout);
596 			remin = remout = -1;
597 		} else if (src) {	/* standard remote to remote */
598 			freeargs(&alist);
599 			addargs(&alist, "%s", ssh_program);
600 			addargs(&alist, "-x");
601 			addargs(&alist, "-oClearAllForwardings=yes");
602 			addargs(&alist, "-n");
603 			for (j = 0; j < remote_remote_args.num; j++) {
604 				addargs(&alist, "%s",
605 				    remote_remote_args.list[j]);
606 			}
607 			*src++ = 0;
608 			if (*src == 0)
609 				src = ".";
610 			host = strrchr(argv[i], '@');
611 
612 			if (host) {
613 				*host++ = 0;
614 				host = cleanhostname(host);
615 				suser = argv[i];
616 				if (*suser == '\0')
617 					suser = pwd->pw_name;
618 				else if (!okname(suser))
619 					continue;
620 				addargs(&alist, "-l");
621 				addargs(&alist, "%s", suser);
622 			} else {
623 				host = cleanhostname(argv[i]);
624 			}
625 			addargs(&alist, "--");
626 			addargs(&alist, "%s", host);
627 			addargs(&alist, "%s", cmd);
628 			addargs(&alist, "%s", src);
629 			addargs(&alist, "%s%s%s:%s",
630 			    tuser ? tuser : "", tuser ? "@" : "",
631 			    thost, targ);
632 			if (do_local_cmd(&alist) != 0)
633 				errs = 1;
634 		} else {	/* local to remote */
635 			if (remin == -1) {
636 				xasprintf(&bp, "%s -t %s%s", cmd,
637 				    *targ == '-' ? "-- " : "", targ);
638 				host = cleanhostname(thost);
639 				if (do_cmd(host, tuser, bp, &remin,
640 				    &remout) < 0)
641 					exit(1);
642 				if (response() < 0)
643 					exit(1);
644 				(void) xfree(bp);
645 			}
646 			source(1, argv + i);
647 		}
648 	}
649 	xfree(arg);
650 }
651 
652 void
653 tolocal(int argc, char **argv)
654 {
655 	char *bp, *host, *src, *suser;
656 	arglist alist;
657 	int i;
658 
659 	memset(&alist, '\0', sizeof(alist));
660 	alist.list = NULL;
661 
662 	for (i = 0; i < argc - 1; i++) {
663 		if (!(src = colon(argv[i]))) {	/* Local to local. */
664 			freeargs(&alist);
665 			addargs(&alist, "%s", _PATH_CP);
666 			if (iamrecursive)
667 				addargs(&alist, "-r");
668 			if (pflag)
669 				addargs(&alist, "-p");
670 			addargs(&alist, "--");
671 			addargs(&alist, "%s", argv[i]);
672 			addargs(&alist, "%s", argv[argc-1]);
673 			if (do_local_cmd(&alist))
674 				++errs;
675 			continue;
676 		}
677 		*src++ = 0;
678 		if (*src == 0)
679 			src = ".";
680 		if ((host = strrchr(argv[i], '@')) == NULL) {
681 			host = argv[i];
682 			suser = NULL;
683 		} else {
684 			*host++ = 0;
685 			suser = argv[i];
686 			if (*suser == '\0')
687 				suser = pwd->pw_name;
688 		}
689 		host = cleanhostname(host);
690 		xasprintf(&bp, "%s -f %s%s",
691 		    cmd, *src == '-' ? "-- " : "", src);
692 		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
693 			(void) xfree(bp);
694 			++errs;
695 			continue;
696 		}
697 		xfree(bp);
698 		sink(1, argv + argc - 1);
699 		(void) close(remin);
700 		remin = remout = -1;
701 	}
702 }
703 
704 void
705 source(int argc, char **argv)
706 {
707 	struct stat stb;
708 	static BUF buffer;
709 	BUF *bp;
710 	off_t i, statbytes;
711 	size_t amt;
712 	int fd = -1, haderr, indx;
713 	char *last, *name, buf[2048], encname[MAXPATHLEN];
714 	int len;
715 
716 	for (indx = 0; indx < argc; ++indx) {
717 		name = argv[indx];
718 		statbytes = 0;
719 		len = strlen(name);
720 		while (len > 1 && name[len-1] == '/')
721 			name[--len] = '\0';
722 		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
723 			goto syserr;
724 		if (strchr(name, '\n') != NULL) {
725 			strnvis(encname, name, sizeof(encname), VIS_NL);
726 			name = encname;
727 		}
728 		if (fstat(fd, &stb) < 0) {
729 syserr:			run_err("%s: %s", name, strerror(errno));
730 			goto next;
731 		}
732 		if (stb.st_size < 0) {
733 			run_err("%s: %s", name, "Negative file size");
734 			goto next;
735 		}
736 		unset_nonblock(fd);
737 		switch (stb.st_mode & S_IFMT) {
738 		case S_IFREG:
739 			break;
740 		case S_IFDIR:
741 			if (iamrecursive) {
742 				rsource(name, &stb);
743 				goto next;
744 			}
745 			/* FALLTHROUGH */
746 		default:
747 			run_err("%s: not a regular file", name);
748 			goto next;
749 		}
750 		if ((last = strrchr(name, '/')) == NULL)
751 			last = name;
752 		else
753 			++last;
754 		curfile = last;
755 		if (pflag) {
756 			/*
757 			 * Make it compatible with possible future
758 			 * versions expecting microseconds.
759 			 */
760 			(void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
761 			    (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime),
762 			    (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime));
763 			if (verbose_mode) {
764 				fprintf(stderr, "File mtime %ld atime %ld\n",
765 				    (long)stb.st_mtime, (long)stb.st_atime);
766 				fprintf(stderr, "Sending file timestamps: %s",
767 				    buf);
768 			}
769 			(void) atomicio(vwrite, remout, buf, strlen(buf));
770 			if (response() < 0)
771 				goto next;
772 		}
773 #define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
774 		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
775 		    (u_int) (stb.st_mode & FILEMODEMASK),
776 		    (long long)stb.st_size, last);
777 		if (verbose_mode) {
778 			fprintf(stderr, "Sending file modes: %s", buf);
779 		}
780 		(void) atomicio(vwrite, remout, buf, strlen(buf));
781 		if (response() < 0)
782 			goto next;
783 		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
784 next:			if (fd != -1) {
785 				(void) close(fd);
786 				fd = -1;
787 			}
788 			continue;
789 		}
790 		if (showprogress)
791 			start_progress_meter(curfile, stb.st_size, &statbytes);
792 		set_nonblock(remout);
793 		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
794 			amt = bp->cnt;
795 			if (i + (off_t)amt > stb.st_size)
796 				amt = stb.st_size - i;
797 			if (!haderr) {
798 				if (atomicio(read, fd, bp->buf, amt) != amt)
799 					haderr = errno;
800 			}
801 			/* Keep writing after error to retain sync */
802 			if (haderr) {
803 				(void)atomicio(vwrite, remout, bp->buf, amt);
804 				continue;
805 			}
806 			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
807 			    &statbytes) != amt)
808 				haderr = errno;
809 		}
810 		unset_nonblock(remout);
811 		if (showprogress)
812 			stop_progress_meter();
813 
814 		if (fd != -1) {
815 			if (close(fd) < 0 && !haderr)
816 				haderr = errno;
817 			fd = -1;
818 		}
819 		if (!haderr)
820 			(void) atomicio(vwrite, remout, "", 1);
821 		else
822 			run_err("%s: %s", name, strerror(haderr));
823 		(void) response();
824 	}
825 }
826 
827 void
828 rsource(char *name, struct stat *statp)
829 {
830 	DIR *dirp;
831 	struct dirent *dp;
832 	char *last, *vect[1], path[1100];
833 
834 	if (!(dirp = opendir(name))) {
835 		run_err("%s: %s", name, strerror(errno));
836 		return;
837 	}
838 	last = strrchr(name, '/');
839 	if (last == 0)
840 		last = name;
841 	else
842 		last++;
843 	if (pflag) {
844 		(void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
845 		    (u_long) statp->st_mtime,
846 		    (u_long) statp->st_atime);
847 		(void) atomicio(vwrite, remout, path, strlen(path));
848 		if (response() < 0) {
849 			closedir(dirp);
850 			return;
851 		}
852 	}
853 	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
854 	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
855 	if (verbose_mode)
856 		fprintf(stderr, "Entering directory: %s", path);
857 	(void) atomicio(vwrite, remout, path, strlen(path));
858 	if (response() < 0) {
859 		closedir(dirp);
860 		return;
861 	}
862 	while ((dp = readdir(dirp)) != NULL) {
863 		if (dp->d_ino == 0)
864 			continue;
865 		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
866 			continue;
867 		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
868 			run_err("%s/%s: name too long", name, dp->d_name);
869 			continue;
870 		}
871 		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
872 		vect[0] = path;
873 		source(1, vect);
874 	}
875 	(void) closedir(dirp);
876 	(void) atomicio(vwrite, remout, "E\n", 2);
877 	(void) response();
878 }
879 
880 void
881 sink(int argc, char **argv)
882 {
883 	static BUF buffer;
884 	struct stat stb;
885 	enum {
886 		YES, NO, DISPLAYED
887 	} wrerr;
888 	BUF *bp;
889 	off_t i;
890 	size_t j, count;
891 	int amt, exists, first, ofd;
892 	mode_t mode, omode, mask;
893 	off_t size, statbytes;
894 	int setimes, targisdir, wrerrno = 0;
895 	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
896 	struct timeval tv[2];
897 
898 #define	atime	tv[0]
899 #define	mtime	tv[1]
900 #define	SCREWUP(str)	{ why = str; goto screwup; }
901 
902 	setimes = targisdir = 0;
903 	mask = umask(0);
904 	if (!pflag)
905 		(void) umask(mask);
906 	if (argc != 1) {
907 		run_err("ambiguous target");
908 		exit(1);
909 	}
910 	targ = *argv;
911 	if (targetshouldbedirectory)
912 		verifydir(targ);
913 
914 	(void) atomicio(vwrite, remout, "", 1);
915 	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
916 		targisdir = 1;
917 	for (first = 1;; first = 0) {
918 		cp = buf;
919 		if (atomicio(read, remin, cp, 1) != 1)
920 			return;
921 		if (*cp++ == '\n')
922 			SCREWUP("unexpected <newline>");
923 		do {
924 			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
925 				SCREWUP("lost connection");
926 			*cp++ = ch;
927 		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
928 		*cp = 0;
929 		if (verbose_mode)
930 			fprintf(stderr, "Sink: %s", buf);
931 
932 		if (buf[0] == '\01' || buf[0] == '\02') {
933 			if (iamremote == 0)
934 				(void) atomicio(vwrite, STDERR_FILENO,
935 				    buf + 1, strlen(buf + 1));
936 			if (buf[0] == '\02')
937 				exit(1);
938 			++errs;
939 			continue;
940 		}
941 		if (buf[0] == 'E') {
942 			(void) atomicio(vwrite, remout, "", 1);
943 			return;
944 		}
945 		if (ch == '\n')
946 			*--cp = 0;
947 
948 		cp = buf;
949 		if (*cp == 'T') {
950 			setimes++;
951 			cp++;
952 			mtime.tv_sec = strtol(cp, &cp, 10);
953 			if (!cp || *cp++ != ' ')
954 				SCREWUP("mtime.sec not delimited");
955 			mtime.tv_usec = strtol(cp, &cp, 10);
956 			if (!cp || *cp++ != ' ')
957 				SCREWUP("mtime.usec not delimited");
958 			atime.tv_sec = strtol(cp, &cp, 10);
959 			if (!cp || *cp++ != ' ')
960 				SCREWUP("atime.sec not delimited");
961 			atime.tv_usec = strtol(cp, &cp, 10);
962 			if (!cp || *cp++ != '\0')
963 				SCREWUP("atime.usec not delimited");
964 			(void) atomicio(vwrite, remout, "", 1);
965 			continue;
966 		}
967 		if (*cp != 'C' && *cp != 'D') {
968 			/*
969 			 * Check for the case "rcp remote:foo\* local:bar".
970 			 * In this case, the line "No match." can be returned
971 			 * by the shell before the rcp command on the remote is
972 			 * executed so the ^Aerror_message convention isn't
973 			 * followed.
974 			 */
975 			if (first) {
976 				run_err("%s", cp);
977 				exit(1);
978 			}
979 			SCREWUP("expected control record");
980 		}
981 		mode = 0;
982 		for (++cp; cp < buf + 5; cp++) {
983 			if (*cp < '0' || *cp > '7')
984 				SCREWUP("bad mode");
985 			mode = (mode << 3) | (*cp - '0');
986 		}
987 		if (*cp++ != ' ')
988 			SCREWUP("mode not delimited");
989 
990 		for (size = 0; isdigit(*cp);)
991 			size = size * 10 + (*cp++ - '0');
992 		if (*cp++ != ' ')
993 			SCREWUP("size not delimited");
994 		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
995 			run_err("error: unexpected filename: %s", cp);
996 			exit(1);
997 		}
998 		if (targisdir) {
999 			static char *namebuf;
1000 			static size_t cursize;
1001 			size_t need;
1002 
1003 			need = strlen(targ) + strlen(cp) + 250;
1004 			if (need > cursize) {
1005 				if (namebuf)
1006 					xfree(namebuf);
1007 				namebuf = xmalloc(need);
1008 				cursize = need;
1009 			}
1010 			(void) snprintf(namebuf, need, "%s%s%s", targ,
1011 			    strcmp(targ, "/") ? "/" : "", cp);
1012 			np = namebuf;
1013 		} else
1014 			np = targ;
1015 		curfile = cp;
1016 		exists = stat(np, &stb) == 0;
1017 		if (buf[0] == 'D') {
1018 			int mod_flag = pflag;
1019 			if (!iamrecursive)
1020 				SCREWUP("received directory without -r");
1021 			if (exists) {
1022 				if (!S_ISDIR(stb.st_mode)) {
1023 					errno = ENOTDIR;
1024 					goto bad;
1025 				}
1026 				if (pflag)
1027 					(void) chmod(np, mode);
1028 			} else {
1029 				/* Handle copying from a read-only
1030 				   directory */
1031 				mod_flag = 1;
1032 				if (mkdir(np, mode | S_IRWXU) < 0)
1033 					goto bad;
1034 			}
1035 			vect[0] = xstrdup(np);
1036 			sink(1, vect);
1037 			if (setimes) {
1038 				setimes = 0;
1039 				if (utimes(vect[0], tv) < 0)
1040 					run_err("%s: set times: %s",
1041 					    vect[0], strerror(errno));
1042 			}
1043 			if (mod_flag)
1044 				(void) chmod(vect[0], mode);
1045 			if (vect[0])
1046 				xfree(vect[0]);
1047 			continue;
1048 		}
1049 		omode = mode;
1050 		mode |= S_IWRITE;
1051 		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1052 bad:			run_err("%s: %s", np, strerror(errno));
1053 			continue;
1054 		}
1055 		(void) atomicio(vwrite, remout, "", 1);
1056 		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1057 			(void) close(ofd);
1058 			continue;
1059 		}
1060 		cp = bp->buf;
1061 		wrerr = NO;
1062 
1063 		statbytes = 0;
1064 		if (showprogress)
1065 			start_progress_meter(curfile, size, &statbytes);
1066 		set_nonblock(remin);
1067 		for (count = i = 0; i < size; i += bp->cnt) {
1068 			amt = bp->cnt;
1069 			if (i + amt > size)
1070 				amt = size - i;
1071 			count += amt;
1072 			do {
1073 				j = atomicio6(read, remin, cp, amt,
1074 				    scpio, &statbytes);
1075 				if (j == 0) {
1076 					run_err("%s", j != EPIPE ?
1077 					    strerror(errno) :
1078 					    "dropped connection");
1079 					exit(1);
1080 				}
1081 				amt -= j;
1082 				cp += j;
1083 			} while (amt > 0);
1084 
1085 			if (count == bp->cnt) {
1086 				/* Keep reading so we stay sync'd up. */
1087 				if (wrerr == NO) {
1088 					if (atomicio(vwrite, ofd, bp->buf,
1089 					    count) != count) {
1090 						wrerr = YES;
1091 						wrerrno = errno;
1092 					}
1093 				}
1094 				count = 0;
1095 				cp = bp->buf;
1096 			}
1097 		}
1098 		unset_nonblock(remin);
1099 		if (showprogress)
1100 			stop_progress_meter();
1101 		if (count != 0 && wrerr == NO &&
1102 		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1103 			wrerr = YES;
1104 			wrerrno = errno;
1105 		}
1106 		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1107 		    ftruncate(ofd, size) != 0) {
1108 			run_err("%s: truncate: %s", np, strerror(errno));
1109 			wrerr = DISPLAYED;
1110 		}
1111 		if (pflag) {
1112 			if (exists || omode != mode)
1113 				if (fchmod(ofd, omode)) {
1114 					run_err("%s: set mode: %s",
1115 					    np, strerror(errno));
1116 					wrerr = DISPLAYED;
1117 				}
1118 		} else {
1119 			if (!exists && omode != mode)
1120 				if (fchmod(ofd, omode & ~mask)) {
1121 					run_err("%s: set mode: %s",
1122 					    np, strerror(errno));
1123 					wrerr = DISPLAYED;
1124 				}
1125 		}
1126 		if (close(ofd) == -1) {
1127 			wrerr = YES;
1128 			wrerrno = errno;
1129 		}
1130 		(void) response();
1131 		if (setimes && wrerr == NO) {
1132 			setimes = 0;
1133 			if (utimes(np, tv) < 0) {
1134 				run_err("%s: set times: %s",
1135 				    np, strerror(errno));
1136 				wrerr = DISPLAYED;
1137 			}
1138 		}
1139 		switch (wrerr) {
1140 		case YES:
1141 			run_err("%s: %s", np, strerror(wrerrno));
1142 			break;
1143 		case NO:
1144 			(void) atomicio(vwrite, remout, "", 1);
1145 			break;
1146 		case DISPLAYED:
1147 			break;
1148 		}
1149 	}
1150 screwup:
1151 	run_err("protocol error: %s", why);
1152 	exit(1);
1153 }
1154 
1155 int
1156 response(void)
1157 {
1158 	char ch, *cp, resp, rbuf[2048];
1159 
1160 	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1161 		lostconn(0);
1162 
1163 	cp = rbuf;
1164 	switch (resp) {
1165 	case 0:		/* ok */
1166 		return (0);
1167 	default:
1168 		*cp++ = resp;
1169 		/* FALLTHROUGH */
1170 	case 1:		/* error, followed by error msg */
1171 	case 2:		/* fatal error, "" */
1172 		do {
1173 			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1174 				lostconn(0);
1175 			*cp++ = ch;
1176 		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1177 
1178 		if (!iamremote)
1179 			(void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1180 		++errs;
1181 		if (resp == 1)
1182 			return (-1);
1183 		exit(1);
1184 	}
1185 	/* NOTREACHED */
1186 }
1187 
1188 void
1189 usage(void)
1190 {
1191 	(void) fprintf(stderr,
1192 	    "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1193 	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1194 	    "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1195 	exit(1);
1196 }
1197 
1198 void
1199 run_err(const char *fmt,...)
1200 {
1201 	static FILE *fp;
1202 	va_list ap;
1203 
1204 	++errs;
1205 	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1206 		(void) fprintf(fp, "%c", 0x01);
1207 		(void) fprintf(fp, "scp: ");
1208 		va_start(ap, fmt);
1209 		(void) vfprintf(fp, fmt, ap);
1210 		va_end(ap);
1211 		(void) fprintf(fp, "\n");
1212 		(void) fflush(fp);
1213 	}
1214 
1215 	if (!iamremote) {
1216 		va_start(ap, fmt);
1217 		vfprintf(stderr, fmt, ap);
1218 		va_end(ap);
1219 		fprintf(stderr, "\n");
1220 	}
1221 }
1222 
1223 void
1224 verifydir(char *cp)
1225 {
1226 	struct stat stb;
1227 
1228 	if (!stat(cp, &stb)) {
1229 		if (S_ISDIR(stb.st_mode))
1230 			return;
1231 		errno = ENOTDIR;
1232 	}
1233 	run_err("%s: %s", cp, strerror(errno));
1234 	killchild(0);
1235 }
1236 
1237 int
1238 okname(char *cp0)
1239 {
1240 	int c;
1241 	char *cp;
1242 
1243 	cp = cp0;
1244 	do {
1245 		c = (int)*cp;
1246 		if (c & 0200)
1247 			goto bad;
1248 		if (!isalpha(c) && !isdigit(c)) {
1249 			switch (c) {
1250 			case '\'':
1251 			case '"':
1252 			case '`':
1253 			case ' ':
1254 			case '#':
1255 				goto bad;
1256 			default:
1257 				break;
1258 			}
1259 		}
1260 	} while (*++cp);
1261 	return (1);
1262 
1263 bad:	fprintf(stderr, "%s: invalid user name\n", cp0);
1264 	return (0);
1265 }
1266 
1267 BUF *
1268 allocbuf(BUF *bp, int fd, int blksize)
1269 {
1270 	size_t size;
1271 	struct stat stb;
1272 
1273 	if (fstat(fd, &stb) < 0) {
1274 		run_err("fstat: %s", strerror(errno));
1275 		return (0);
1276 	}
1277 	size = roundup(stb.st_blksize, blksize);
1278 	if (size == 0)
1279 		size = blksize;
1280 	if (bp->cnt >= size)
1281 		return (bp);
1282 	if (bp->buf == NULL)
1283 		bp->buf = xmalloc(size);
1284 	else
1285 		bp->buf = xrealloc(bp->buf, 1, size);
1286 	memset(bp->buf, 0, size);
1287 	bp->cnt = size;
1288 	return (bp);
1289 }
1290 
1291 void
1292 lostconn(int signo)
1293 {
1294 	if (!iamremote)
1295 		write(STDERR_FILENO, "lost connection\n", 16);
1296 	if (signo)
1297 		_exit(1);
1298 	else
1299 		exit(1);
1300 }
1301