scp.c revision 323134 
1/* $OpenBSD: scp.c,v 1.187 2016/09/12 01:22:38 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#include <stdio.h>
103#include <stdlib.h>
104#include <string.h>
105#include <time.h>
106#include <unistd.h>
107#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
108#include <vis.h>
109#endif
110
111#include "xmalloc.h"
112#include "atomicio.h"
113#include "pathnames.h"
114#include "log.h"
115#include "misc.h"
116#include "progressmeter.h"
117#include "utf8.h"
118
119extern char *__progname;
120
121#define COPY_BUFLEN	16384
122
123int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
124int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
125
126/* Struct for addargs */
127arglist args;
128arglist remote_remote_args;
129
130/* Bandwidth limit */
131long long limit_kbps = 0;
132struct bwlimit bwlimit;
133
134/* Name of current file being transferred. */
135char *curfile;
136
137/* This is set to non-zero to enable verbose mode. */
138int verbose_mode = 0;
139
140/* This is set to zero if the progressmeter is not desired. */
141int showprogress = 1;
142
143/*
144 * This is set to non-zero if remote-remote copy should be piped
145 * through this process.
146 */
147int throughlocal = 0;
148
149/* This is the program to execute for the secured connection. ("ssh" or -S) */
150char *ssh_program = _PATH_SSH_PROGRAM;
151
152/* This is used to store the pid of ssh_program */
153pid_t do_cmd_pid = -1;
154
155static void
156killchild(int signo)
157{
158	if (do_cmd_pid > 1) {
159		kill(do_cmd_pid, signo ? signo : SIGTERM);
160		waitpid(do_cmd_pid, NULL, 0);
161	}
162
163	if (signo)
164		_exit(1);
165	exit(1);
166}
167
168static void
169suspchild(int signo)
170{
171	int status;
172
173	if (do_cmd_pid > 1) {
174		kill(do_cmd_pid, signo);
175		while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
176		    errno == EINTR)
177			;
178		kill(getpid(), SIGSTOP);
179	}
180}
181
182static int
183do_local_cmd(arglist *a)
184{
185	u_int i;
186	int status;
187	pid_t pid;
188
189	if (a->num == 0)
190		fatal("do_local_cmd: no arguments");
191
192	if (verbose_mode) {
193		fprintf(stderr, "Executing:");
194		for (i = 0; i < a->num; i++)
195			fmprintf(stderr, " %s", a->list[i]);
196		fprintf(stderr, "\n");
197	}
198	if ((pid = fork()) == -1)
199		fatal("do_local_cmd: fork: %s", strerror(errno));
200
201	if (pid == 0) {
202		execvp(a->list[0], a->list);
203		perror(a->list[0]);
204		exit(1);
205	}
206
207	do_cmd_pid = pid;
208	signal(SIGTERM, killchild);
209	signal(SIGINT, killchild);
210	signal(SIGHUP, killchild);
211
212	while (waitpid(pid, &status, 0) == -1)
213		if (errno != EINTR)
214			fatal("do_local_cmd: waitpid: %s", strerror(errno));
215
216	do_cmd_pid = -1;
217
218	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
219		return (-1);
220
221	return (0);
222}
223
224/*
225 * This function executes the given command as the specified user on the
226 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
227 * assigns the input and output file descriptors on success.
228 */
229
230int
231do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
232{
233	int pin[2], pout[2], reserved[2];
234
235	if (verbose_mode)
236		fmprintf(stderr,
237		    "Executing: program %s host %s, user %s, command %s\n",
238		    ssh_program, host,
239		    remuser ? remuser : "(unspecified)", cmd);
240
241	/*
242	 * Reserve two descriptors so that the real pipes won't get
243	 * descriptors 0 and 1 because that will screw up dup2 below.
244	 */
245	if (pipe(reserved) < 0)
246		fatal("pipe: %s", strerror(errno));
247
248	/* Create a socket pair for communicating with ssh. */
249	if (pipe(pin) < 0)
250		fatal("pipe: %s", strerror(errno));
251	if (pipe(pout) < 0)
252		fatal("pipe: %s", strerror(errno));
253
254	/* Free the reserved descriptors. */
255	close(reserved[0]);
256	close(reserved[1]);
257
258	signal(SIGTSTP, suspchild);
259	signal(SIGTTIN, suspchild);
260	signal(SIGTTOU, suspchild);
261
262	/* Fork a child to execute the command on the remote host using ssh. */
263	do_cmd_pid = fork();
264	if (do_cmd_pid == 0) {
265		/* Child. */
266		close(pin[1]);
267		close(pout[0]);
268		dup2(pin[0], 0);
269		dup2(pout[1], 1);
270		close(pin[0]);
271		close(pout[1]);
272
273		replacearg(&args, 0, "%s", ssh_program);
274		if (remuser != NULL) {
275			addargs(&args, "-l");
276			addargs(&args, "%s", remuser);
277		}
278		addargs(&args, "--");
279		addargs(&args, "%s", host);
280		addargs(&args, "%s", cmd);
281
282		execvp(ssh_program, args.list);
283		perror(ssh_program);
284		exit(1);
285	} else if (do_cmd_pid == -1) {
286		fatal("fork: %s", strerror(errno));
287	}
288	/* Parent.  Close the other side, and return the local side. */
289	close(pin[0]);
290	*fdout = pin[1];
291	close(pout[1]);
292	*fdin = pout[0];
293	signal(SIGTERM, killchild);
294	signal(SIGINT, killchild);
295	signal(SIGHUP, killchild);
296	return 0;
297}
298
299/*
300 * This functions executes a command simlar to do_cmd(), but expects the
301 * input and output descriptors to be setup by a previous call to do_cmd().
302 * This way the input and output of two commands can be connected.
303 */
304int
305do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
306{
307	pid_t pid;
308	int status;
309
310	if (verbose_mode)
311		fmprintf(stderr,
312		    "Executing: 2nd program %s host %s, user %s, command %s\n",
313		    ssh_program, host,
314		    remuser ? remuser : "(unspecified)", cmd);
315
316	/* Fork a child to execute the command on the remote host using ssh. */
317	pid = fork();
318	if (pid == 0) {
319		dup2(fdin, 0);
320		dup2(fdout, 1);
321
322		replacearg(&args, 0, "%s", ssh_program);
323		if (remuser != NULL) {
324			addargs(&args, "-l");
325			addargs(&args, "%s", remuser);
326		}
327		addargs(&args, "--");
328		addargs(&args, "%s", host);
329		addargs(&args, "%s", cmd);
330
331		execvp(ssh_program, args.list);
332		perror(ssh_program);
333		exit(1);
334	} else if (pid == -1) {
335		fatal("fork: %s", strerror(errno));
336	}
337	while (waitpid(pid, &status, 0) == -1)
338		if (errno != EINTR)
339			fatal("do_cmd2: waitpid: %s", strerror(errno));
340	return 0;
341}
342
343typedef struct {
344	size_t cnt;
345	char *buf;
346} BUF;
347
348BUF *allocbuf(BUF *, int, int);
349void lostconn(int);
350int okname(char *);
351void run_err(const char *,...);
352void verifydir(char *);
353
354struct passwd *pwd;
355uid_t userid;
356int errs, remin, remout;
357int pflag, iamremote, iamrecursive, targetshouldbedirectory;
358
359#define	CMDNEEDS	64
360char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
361
362int response(void);
363void rsource(char *, struct stat *);
364void sink(int, char *[]);
365void source(int, char *[]);
366void tolocal(int, char *[]);
367void toremote(char *, int, char *[]);
368void usage(void);
369
370int
371main(int argc, char **argv)
372{
373	int ch, fflag, tflag, status, n;
374	char *targ, **newargv;
375	const char *errstr;
376	extern char *optarg;
377	extern int optind;
378
379	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
380	sanitise_stdfd();
381
382	msetlocale();
383
384	/* Copy argv, because we modify it */
385	newargv = xcalloc(MAXIMUM(argc + 1, 1), sizeof(*newargv));
386	for (n = 0; n < argc; n++)
387		newargv[n] = xstrdup(argv[n]);
388	argv = newargv;
389
390	__progname = ssh_get_progname(argv[0]);
391
392	memset(&args, '\0', sizeof(args));
393	memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
394	args.list = remote_remote_args.list = NULL;
395	addargs(&args, "%s", ssh_program);
396	addargs(&args, "-x");
397	addargs(&args, "-oForwardAgent=no");
398	addargs(&args, "-oPermitLocalCommand=no");
399	addargs(&args, "-oClearAllForwardings=yes");
400
401	fflag = tflag = 0;
402	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
403		switch (ch) {
404		/* User-visible flags. */
405		case '1':
406		case '2':
407		case '4':
408		case '6':
409		case 'C':
410			addargs(&args, "-%c", ch);
411			addargs(&remote_remote_args, "-%c", ch);
412			break;
413		case '3':
414			throughlocal = 1;
415			break;
416		case 'o':
417		case 'c':
418		case 'i':
419		case 'F':
420			addargs(&remote_remote_args, "-%c", ch);
421			addargs(&remote_remote_args, "%s", optarg);
422			addargs(&args, "-%c", ch);
423			addargs(&args, "%s", optarg);
424			break;
425		case 'P':
426			addargs(&remote_remote_args, "-p");
427			addargs(&remote_remote_args, "%s", optarg);
428			addargs(&args, "-p");
429			addargs(&args, "%s", optarg);
430			break;
431		case 'B':
432			addargs(&remote_remote_args, "-oBatchmode=yes");
433			addargs(&args, "-oBatchmode=yes");
434			break;
435		case 'l':
436			limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
437			    &errstr);
438			if (errstr != NULL)
439				usage();
440			limit_kbps *= 1024; /* kbps */
441			bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
442			break;
443		case 'p':
444			pflag = 1;
445			break;
446		case 'r':
447			iamrecursive = 1;
448			break;
449		case 'S':
450			ssh_program = xstrdup(optarg);
451			break;
452		case 'v':
453			addargs(&args, "-v");
454			addargs(&remote_remote_args, "-v");
455			verbose_mode = 1;
456			break;
457		case 'q':
458			addargs(&args, "-q");
459			addargs(&remote_remote_args, "-q");
460			showprogress = 0;
461			break;
462
463		/* Server options. */
464		case 'd':
465			targetshouldbedirectory = 1;
466			break;
467		case 'f':	/* "from" */
468			iamremote = 1;
469			fflag = 1;
470			break;
471		case 't':	/* "to" */
472			iamremote = 1;
473			tflag = 1;
474#ifdef HAVE_CYGWIN
475			setmode(0, O_BINARY);
476#endif
477			break;
478		default:
479			usage();
480		}
481	argc -= optind;
482	argv += optind;
483
484	if ((pwd = getpwuid(userid = getuid())) == NULL)
485		fatal("unknown user %u", (u_int) userid);
486
487	if (!isatty(STDOUT_FILENO))
488		showprogress = 0;
489
490	if (pflag) {
491		/* Cannot pledge: -p allows setuid/setgid files... */
492	} else {
493		if (pledge("stdio rpath wpath cpath fattr tty proc exec",
494		    NULL) == -1) {
495			perror("pledge");
496			exit(1);
497		}
498	}
499
500	remin = STDIN_FILENO;
501	remout = STDOUT_FILENO;
502
503	if (fflag) {
504		/* Follow "protocol", send data. */
505		(void) response();
506		source(argc, argv);
507		exit(errs != 0);
508	}
509	if (tflag) {
510		/* Receive data. */
511		sink(argc, argv);
512		exit(errs != 0);
513	}
514	if (argc < 2)
515		usage();
516	if (argc > 2)
517		targetshouldbedirectory = 1;
518
519	remin = remout = -1;
520	do_cmd_pid = -1;
521	/* Command to be executed on remote system using "ssh". */
522	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
523	    verbose_mode ? " -v" : "",
524	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
525	    targetshouldbedirectory ? " -d" : "");
526
527	(void) signal(SIGPIPE, lostconn);
528
529	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
530		toremote(targ, argc, argv);
531	else {
532		if (targetshouldbedirectory)
533			verifydir(argv[argc - 1]);
534		tolocal(argc, argv);	/* Dest is local host. */
535	}
536	/*
537	 * Finally check the exit status of the ssh process, if one was forked
538	 * and no error has occurred yet
539	 */
540	if (do_cmd_pid != -1 && errs == 0) {
541		if (remin != -1)
542		    (void) close(remin);
543		if (remout != -1)
544		    (void) close(remout);
545		if (waitpid(do_cmd_pid, &status, 0) == -1)
546			errs = 1;
547		else {
548			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
549				errs = 1;
550		}
551	}
552	exit(errs != 0);
553}
554
555/* Callback from atomicio6 to update progress meter and limit bandwidth */
556static int
557scpio(void *_cnt, size_t s)
558{
559	off_t *cnt = (off_t *)_cnt;
560
561	*cnt += s;
562	if (limit_kbps > 0)
563		bandwidth_limit(&bwlimit, s);
564	return 0;
565}
566
567static int
568do_times(int fd, int verb, const struct stat *sb)
569{
570	/* strlen(2^64) == 20; strlen(10^6) == 7 */
571	char buf[(20 + 7 + 2) * 2 + 2];
572
573	(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
574	    (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
575	    (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
576	if (verb) {
577		fprintf(stderr, "File mtime %lld atime %lld\n",
578		    (long long)sb->st_mtime, (long long)sb->st_atime);
579		fprintf(stderr, "Sending file timestamps: %s", buf);
580	}
581	(void) atomicio(vwrite, fd, buf, strlen(buf));
582	return (response());
583}
584
585void
586toremote(char *targ, int argc, char **argv)
587{
588	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
589	arglist alist;
590	int i;
591	u_int j;
592
593	memset(&alist, '\0', sizeof(alist));
594	alist.list = NULL;
595
596	*targ++ = 0;
597	if (*targ == 0)
598		targ = ".";
599
600	arg = xstrdup(argv[argc - 1]);
601	if ((thost = strrchr(arg, '@'))) {
602		/* user@host */
603		*thost++ = 0;
604		tuser = arg;
605		if (*tuser == '\0')
606			tuser = NULL;
607	} else {
608		thost = arg;
609		tuser = NULL;
610	}
611
612	if (tuser != NULL && !okname(tuser)) {
613		free(arg);
614		return;
615	}
616
617	for (i = 0; i < argc - 1; i++) {
618		src = colon(argv[i]);
619		if (src && throughlocal) {	/* extended remote to remote */
620			*src++ = 0;
621			if (*src == 0)
622				src = ".";
623			host = strrchr(argv[i], '@');
624			if (host) {
625				*host++ = 0;
626				host = cleanhostname(host);
627				suser = argv[i];
628				if (*suser == '\0')
629					suser = pwd->pw_name;
630				else if (!okname(suser))
631					continue;
632			} else {
633				host = cleanhostname(argv[i]);
634				suser = NULL;
635			}
636			xasprintf(&bp, "%s -f %s%s", cmd,
637			    *src == '-' ? "-- " : "", src);
638			if (do_cmd(host, suser, bp, &remin, &remout) < 0)
639				exit(1);
640			free(bp);
641			host = cleanhostname(thost);
642			xasprintf(&bp, "%s -t %s%s", cmd,
643			    *targ == '-' ? "-- " : "", targ);
644			if (do_cmd2(host, tuser, bp, remin, remout) < 0)
645				exit(1);
646			free(bp);
647			(void) close(remin);
648			(void) close(remout);
649			remin = remout = -1;
650		} else if (src) {	/* standard remote to remote */
651			freeargs(&alist);
652			addargs(&alist, "%s", ssh_program);
653			addargs(&alist, "-x");
654			addargs(&alist, "-oClearAllForwardings=yes");
655			addargs(&alist, "-n");
656			for (j = 0; j < remote_remote_args.num; j++) {
657				addargs(&alist, "%s",
658				    remote_remote_args.list[j]);
659			}
660			*src++ = 0;
661			if (*src == 0)
662				src = ".";
663			host = strrchr(argv[i], '@');
664
665			if (host) {
666				*host++ = 0;
667				host = cleanhostname(host);
668				suser = argv[i];
669				if (*suser == '\0')
670					suser = pwd->pw_name;
671				else if (!okname(suser))
672					continue;
673				addargs(&alist, "-l");
674				addargs(&alist, "%s", suser);
675			} else {
676				host = cleanhostname(argv[i]);
677			}
678			addargs(&alist, "--");
679			addargs(&alist, "%s", host);
680			addargs(&alist, "%s", cmd);
681			addargs(&alist, "%s", src);
682			addargs(&alist, "%s%s%s:%s",
683			    tuser ? tuser : "", tuser ? "@" : "",
684			    thost, targ);
685			if (do_local_cmd(&alist) != 0)
686				errs = 1;
687		} else {	/* local to remote */
688			if (remin == -1) {
689				xasprintf(&bp, "%s -t %s%s", cmd,
690				    *targ == '-' ? "-- " : "", targ);
691				host = cleanhostname(thost);
692				if (do_cmd(host, tuser, bp, &remin,
693				    &remout) < 0)
694					exit(1);
695				if (response() < 0)
696					exit(1);
697				free(bp);
698			}
699			source(1, argv + i);
700		}
701	}
702	free(arg);
703}
704
705void
706tolocal(int argc, char **argv)
707{
708	char *bp, *host, *src, *suser;
709	arglist alist;
710	int i;
711
712	memset(&alist, '\0', sizeof(alist));
713	alist.list = NULL;
714
715	for (i = 0; i < argc - 1; i++) {
716		if (!(src = colon(argv[i]))) {	/* Local to local. */
717			freeargs(&alist);
718			addargs(&alist, "%s", _PATH_CP);
719			if (iamrecursive)
720				addargs(&alist, "-r");
721			if (pflag)
722				addargs(&alist, "-p");
723			addargs(&alist, "--");
724			addargs(&alist, "%s", argv[i]);
725			addargs(&alist, "%s", argv[argc-1]);
726			if (do_local_cmd(&alist))
727				++errs;
728			continue;
729		}
730		*src++ = 0;
731		if (*src == 0)
732			src = ".";
733		if ((host = strrchr(argv[i], '@')) == NULL) {
734			host = argv[i];
735			suser = NULL;
736		} else {
737			*host++ = 0;
738			suser = argv[i];
739			if (*suser == '\0')
740				suser = pwd->pw_name;
741		}
742		host = cleanhostname(host);
743		xasprintf(&bp, "%s -f %s%s",
744		    cmd, *src == '-' ? "-- " : "", src);
745		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
746			free(bp);
747			++errs;
748			continue;
749		}
750		free(bp);
751		sink(1, argv + argc - 1);
752		(void) close(remin);
753		remin = remout = -1;
754	}
755}
756
757void
758source(int argc, char **argv)
759{
760	struct stat stb;
761	static BUF buffer;
762	BUF *bp;
763	off_t i, statbytes;
764	size_t amt, nr;
765	int fd = -1, haderr, indx;
766	char *last, *name, buf[2048], encname[PATH_MAX];
767	int len;
768
769	for (indx = 0; indx < argc; ++indx) {
770		name = argv[indx];
771		statbytes = 0;
772		len = strlen(name);
773		while (len > 1 && name[len-1] == '/')
774			name[--len] = '\0';
775		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
776			goto syserr;
777		if (strchr(name, '\n') != NULL) {
778			strnvis(encname, name, sizeof(encname), VIS_NL);
779			name = encname;
780		}
781		if (fstat(fd, &stb) < 0) {
782syserr:			run_err("%s: %s", name, strerror(errno));
783			goto next;
784		}
785		if (stb.st_size < 0) {
786			run_err("%s: %s", name, "Negative file size");
787			goto next;
788		}
789		unset_nonblock(fd);
790		switch (stb.st_mode & S_IFMT) {
791		case S_IFREG:
792			break;
793		case S_IFDIR:
794			if (iamrecursive) {
795				rsource(name, &stb);
796				goto next;
797			}
798			/* FALLTHROUGH */
799		default:
800			run_err("%s: not a regular file", name);
801			goto next;
802		}
803		if ((last = strrchr(name, '/')) == NULL)
804			last = name;
805		else
806			++last;
807		curfile = last;
808		if (pflag) {
809			if (do_times(remout, verbose_mode, &stb) < 0)
810				goto next;
811		}
812#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
813		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
814		    (u_int) (stb.st_mode & FILEMODEMASK),
815		    (long long)stb.st_size, last);
816		if (verbose_mode)
817			fmprintf(stderr, "Sending file modes: %s", buf);
818		(void) atomicio(vwrite, remout, buf, strlen(buf));
819		if (response() < 0)
820			goto next;
821		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
822next:			if (fd != -1) {
823				(void) close(fd);
824				fd = -1;
825			}
826			continue;
827		}
828		if (showprogress)
829			start_progress_meter(curfile, stb.st_size, &statbytes);
830		set_nonblock(remout);
831		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
832			amt = bp->cnt;
833			if (i + (off_t)amt > stb.st_size)
834				amt = stb.st_size - i;
835			if (!haderr) {
836				if ((nr = atomicio(read, fd,
837				    bp->buf, amt)) != amt) {
838					haderr = errno;
839					memset(bp->buf + nr, 0, amt - nr);
840				}
841			}
842			/* Keep writing after error to retain sync */
843			if (haderr) {
844				(void)atomicio(vwrite, remout, bp->buf, amt);
845				memset(bp->buf, 0, amt);
846				continue;
847			}
848			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
849			    &statbytes) != amt)
850				haderr = errno;
851		}
852		unset_nonblock(remout);
853
854		if (fd != -1) {
855			if (close(fd) < 0 && !haderr)
856				haderr = errno;
857			fd = -1;
858		}
859		if (!haderr)
860			(void) atomicio(vwrite, remout, "", 1);
861		else
862			run_err("%s: %s", name, strerror(haderr));
863		(void) response();
864		if (showprogress)
865			stop_progress_meter();
866	}
867}
868
869void
870rsource(char *name, struct stat *statp)
871{
872	DIR *dirp;
873	struct dirent *dp;
874	char *last, *vect[1], path[PATH_MAX];
875
876	if (!(dirp = opendir(name))) {
877		run_err("%s: %s", name, strerror(errno));
878		return;
879	}
880	last = strrchr(name, '/');
881	if (last == NULL)
882		last = name;
883	else
884		last++;
885	if (pflag) {
886		if (do_times(remout, verbose_mode, statp) < 0) {
887			closedir(dirp);
888			return;
889		}
890	}
891	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
892	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
893	if (verbose_mode)
894		fmprintf(stderr, "Entering directory: %s", path);
895	(void) atomicio(vwrite, remout, path, strlen(path));
896	if (response() < 0) {
897		closedir(dirp);
898		return;
899	}
900	while ((dp = readdir(dirp)) != NULL) {
901		if (dp->d_ino == 0)
902			continue;
903		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
904			continue;
905		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
906			run_err("%s/%s: name too long", name, dp->d_name);
907			continue;
908		}
909		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
910		vect[0] = path;
911		source(1, vect);
912	}
913	(void) closedir(dirp);
914	(void) atomicio(vwrite, remout, "E\n", 2);
915	(void) response();
916}
917
918void
919sink(int argc, char **argv)
920{
921	static BUF buffer;
922	struct stat stb;
923	enum {
924		YES, NO, DISPLAYED
925	} wrerr;
926	BUF *bp;
927	off_t i;
928	size_t j, count;
929	int amt, exists, first, ofd;
930	mode_t mode, omode, mask;
931	off_t size, statbytes;
932	unsigned long long ull;
933	int setimes, targisdir, wrerrno = 0;
934	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
935	struct timeval tv[2];
936
937#define	atime	tv[0]
938#define	mtime	tv[1]
939#define	SCREWUP(str)	{ why = str; goto screwup; }
940
941	setimes = targisdir = 0;
942	mask = umask(0);
943	if (!pflag)
944		(void) umask(mask);
945	if (argc != 1) {
946		run_err("ambiguous target");
947		exit(1);
948	}
949	targ = *argv;
950	if (targetshouldbedirectory)
951		verifydir(targ);
952
953	(void) atomicio(vwrite, remout, "", 1);
954	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
955		targisdir = 1;
956	for (first = 1;; first = 0) {
957		cp = buf;
958		if (atomicio(read, remin, cp, 1) != 1)
959			return;
960		if (*cp++ == '\n')
961			SCREWUP("unexpected <newline>");
962		do {
963			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
964				SCREWUP("lost connection");
965			*cp++ = ch;
966		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
967		*cp = 0;
968		if (verbose_mode)
969			fmprintf(stderr, "Sink: %s", buf);
970
971		if (buf[0] == '\01' || buf[0] == '\02') {
972			if (iamremote == 0) {
973				(void) snmprintf(visbuf, sizeof(visbuf),
974				    NULL, "%s", buf + 1);
975				(void) atomicio(vwrite, STDERR_FILENO,
976				    visbuf, strlen(visbuf));
977			}
978			if (buf[0] == '\02')
979				exit(1);
980			++errs;
981			continue;
982		}
983		if (buf[0] == 'E') {
984			(void) atomicio(vwrite, remout, "", 1);
985			return;
986		}
987		if (ch == '\n')
988			*--cp = 0;
989
990		cp = buf;
991		if (*cp == 'T') {
992			setimes++;
993			cp++;
994			if (!isdigit((unsigned char)*cp))
995				SCREWUP("mtime.sec not present");
996			ull = strtoull(cp, &cp, 10);
997			if (!cp || *cp++ != ' ')
998				SCREWUP("mtime.sec not delimited");
999			if ((time_t)ull < 0 ||
1000			    (unsigned long long)(time_t)ull != ull)
1001				setimes = 0;	/* out of range */
1002			mtime.tv_sec = ull;
1003			mtime.tv_usec = strtol(cp, &cp, 10);
1004			if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
1005			    mtime.tv_usec > 999999)
1006				SCREWUP("mtime.usec not delimited");
1007			if (!isdigit((unsigned char)*cp))
1008				SCREWUP("atime.sec not present");
1009			ull = strtoull(cp, &cp, 10);
1010			if (!cp || *cp++ != ' ')
1011				SCREWUP("atime.sec not delimited");
1012			if ((time_t)ull < 0 ||
1013			    (unsigned long long)(time_t)ull != ull)
1014				setimes = 0;	/* out of range */
1015			atime.tv_sec = ull;
1016			atime.tv_usec = strtol(cp, &cp, 10);
1017			if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1018			    atime.tv_usec > 999999)
1019				SCREWUP("atime.usec not delimited");
1020			(void) atomicio(vwrite, remout, "", 1);
1021			continue;
1022		}
1023		if (*cp != 'C' && *cp != 'D') {
1024			/*
1025			 * Check for the case "rcp remote:foo\* local:bar".
1026			 * In this case, the line "No match." can be returned
1027			 * by the shell before the rcp command on the remote is
1028			 * executed so the ^Aerror_message convention isn't
1029			 * followed.
1030			 */
1031			if (first) {
1032				run_err("%s", cp);
1033				exit(1);
1034			}
1035			SCREWUP("expected control record");
1036		}
1037		mode = 0;
1038		for (++cp; cp < buf + 5; cp++) {
1039			if (*cp < '0' || *cp > '7')
1040				SCREWUP("bad mode");
1041			mode = (mode << 3) | (*cp - '0');
1042		}
1043		if (*cp++ != ' ')
1044			SCREWUP("mode not delimited");
1045
1046		for (size = 0; isdigit((unsigned char)*cp);)
1047			size = size * 10 + (*cp++ - '0');
1048		if (*cp++ != ' ')
1049			SCREWUP("size not delimited");
1050		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1051			run_err("error: unexpected filename: %s", cp);
1052			exit(1);
1053		}
1054		if (targisdir) {
1055			static char *namebuf;
1056			static size_t cursize;
1057			size_t need;
1058
1059			need = strlen(targ) + strlen(cp) + 250;
1060			if (need > cursize) {
1061				free(namebuf);
1062				namebuf = xmalloc(need);
1063				cursize = need;
1064			}
1065			(void) snprintf(namebuf, need, "%s%s%s", targ,
1066			    strcmp(targ, "/") ? "/" : "", cp);
1067			np = namebuf;
1068		} else
1069			np = targ;
1070		curfile = cp;
1071		exists = stat(np, &stb) == 0;
1072		if (buf[0] == 'D') {
1073			int mod_flag = pflag;
1074			if (!iamrecursive)
1075				SCREWUP("received directory without -r");
1076			if (exists) {
1077				if (!S_ISDIR(stb.st_mode)) {
1078					errno = ENOTDIR;
1079					goto bad;
1080				}
1081				if (pflag)
1082					(void) chmod(np, mode);
1083			} else {
1084				/* Handle copying from a read-only
1085				   directory */
1086				mod_flag = 1;
1087				if (mkdir(np, mode | S_IRWXU) < 0)
1088					goto bad;
1089			}
1090			vect[0] = xstrdup(np);
1091			sink(1, vect);
1092			if (setimes) {
1093				setimes = 0;
1094				if (utimes(vect[0], tv) < 0)
1095					run_err("%s: set times: %s",
1096					    vect[0], strerror(errno));
1097			}
1098			if (mod_flag)
1099				(void) chmod(vect[0], mode);
1100			free(vect[0]);
1101			continue;
1102		}
1103		omode = mode;
1104		mode |= S_IWUSR;
1105		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1106bad:			run_err("%s: %s", np, strerror(errno));
1107			continue;
1108		}
1109		(void) atomicio(vwrite, remout, "", 1);
1110		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1111			(void) close(ofd);
1112			continue;
1113		}
1114		cp = bp->buf;
1115		wrerr = NO;
1116
1117		statbytes = 0;
1118		if (showprogress)
1119			start_progress_meter(curfile, size, &statbytes);
1120		set_nonblock(remin);
1121		for (count = i = 0; i < size; i += bp->cnt) {
1122			amt = bp->cnt;
1123			if (i + amt > size)
1124				amt = size - i;
1125			count += amt;
1126			do {
1127				j = atomicio6(read, remin, cp, amt,
1128				    scpio, &statbytes);
1129				if (j == 0) {
1130					run_err("%s", j != EPIPE ?
1131					    strerror(errno) :
1132					    "dropped connection");
1133					exit(1);
1134				}
1135				amt -= j;
1136				cp += j;
1137			} while (amt > 0);
1138
1139			if (count == bp->cnt) {
1140				/* Keep reading so we stay sync'd up. */
1141				if (wrerr == NO) {
1142					if (atomicio(vwrite, ofd, bp->buf,
1143					    count) != count) {
1144						wrerr = YES;
1145						wrerrno = errno;
1146					}
1147				}
1148				count = 0;
1149				cp = bp->buf;
1150			}
1151		}
1152		unset_nonblock(remin);
1153		if (count != 0 && wrerr == NO &&
1154		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1155			wrerr = YES;
1156			wrerrno = errno;
1157		}
1158		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1159		    ftruncate(ofd, size) != 0) {
1160			run_err("%s: truncate: %s", np, strerror(errno));
1161			wrerr = DISPLAYED;
1162		}
1163		if (pflag) {
1164			if (exists || omode != mode)
1165#ifdef HAVE_FCHMOD
1166				if (fchmod(ofd, omode)) {
1167#else /* HAVE_FCHMOD */
1168				if (chmod(np, omode)) {
1169#endif /* HAVE_FCHMOD */
1170					run_err("%s: set mode: %s",
1171					    np, strerror(errno));
1172					wrerr = DISPLAYED;
1173				}
1174		} else {
1175			if (!exists && omode != mode)
1176#ifdef HAVE_FCHMOD
1177				if (fchmod(ofd, omode & ~mask)) {
1178#else /* HAVE_FCHMOD */
1179				if (chmod(np, omode & ~mask)) {
1180#endif /* HAVE_FCHMOD */
1181					run_err("%s: set mode: %s",
1182					    np, strerror(errno));
1183					wrerr = DISPLAYED;
1184				}
1185		}
1186		if (close(ofd) == -1) {
1187			wrerr = YES;
1188			wrerrno = errno;
1189		}
1190		(void) response();
1191		if (showprogress)
1192			stop_progress_meter();
1193		if (setimes && wrerr == NO) {
1194			setimes = 0;
1195			if (utimes(np, tv) < 0) {
1196				run_err("%s: set times: %s",
1197				    np, strerror(errno));
1198				wrerr = DISPLAYED;
1199			}
1200		}
1201		switch (wrerr) {
1202		case YES:
1203			run_err("%s: %s", np, strerror(wrerrno));
1204			break;
1205		case NO:
1206			(void) atomicio(vwrite, remout, "", 1);
1207			break;
1208		case DISPLAYED:
1209			break;
1210		}
1211	}
1212screwup:
1213	run_err("protocol error: %s", why);
1214	exit(1);
1215}
1216
1217int
1218response(void)
1219{
1220	char ch, *cp, resp, rbuf[2048], visbuf[2048];
1221
1222	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1223		lostconn(0);
1224
1225	cp = rbuf;
1226	switch (resp) {
1227	case 0:		/* ok */
1228		return (0);
1229	default:
1230		*cp++ = resp;
1231		/* FALLTHROUGH */
1232	case 1:		/* error, followed by error msg */
1233	case 2:		/* fatal error, "" */
1234		do {
1235			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1236				lostconn(0);
1237			*cp++ = ch;
1238		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1239
1240		if (!iamremote) {
1241			cp[-1] = '\0';
1242			(void) snmprintf(visbuf, sizeof(visbuf),
1243			    NULL, "%s\n", rbuf);
1244			(void) atomicio(vwrite, STDERR_FILENO,
1245			    visbuf, strlen(visbuf));
1246		}
1247		++errs;
1248		if (resp == 1)
1249			return (-1);
1250		exit(1);
1251	}
1252	/* NOTREACHED */
1253}
1254
1255void
1256usage(void)
1257{
1258	(void) fprintf(stderr,
1259	    "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1260	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1261	    "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1262	exit(1);
1263}
1264
1265void
1266run_err(const char *fmt,...)
1267{
1268	static FILE *fp;
1269	va_list ap;
1270
1271	++errs;
1272	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1273		(void) fprintf(fp, "%c", 0x01);
1274		(void) fprintf(fp, "scp: ");
1275		va_start(ap, fmt);
1276		(void) vfprintf(fp, fmt, ap);
1277		va_end(ap);
1278		(void) fprintf(fp, "\n");
1279		(void) fflush(fp);
1280	}
1281
1282	if (!iamremote) {
1283		va_start(ap, fmt);
1284		vfmprintf(stderr, fmt, ap);
1285		va_end(ap);
1286		fprintf(stderr, "\n");
1287	}
1288}
1289
1290void
1291verifydir(char *cp)
1292{
1293	struct stat stb;
1294
1295	if (!stat(cp, &stb)) {
1296		if (S_ISDIR(stb.st_mode))
1297			return;
1298		errno = ENOTDIR;
1299	}
1300	run_err("%s: %s", cp, strerror(errno));
1301	killchild(0);
1302}
1303
1304int
1305okname(char *cp0)
1306{
1307	int c;
1308	char *cp;
1309
1310	cp = cp0;
1311	do {
1312		c = (int)*cp;
1313		if (c & 0200)
1314			goto bad;
1315		if (!isalpha(c) && !isdigit((unsigned char)c)) {
1316			switch (c) {
1317			case '\'':
1318			case '"':
1319			case '`':
1320			case ' ':
1321			case '#':
1322				goto bad;
1323			default:
1324				break;
1325			}
1326		}
1327	} while (*++cp);
1328	return (1);
1329
1330bad:	fmprintf(stderr, "%s: invalid user name\n", cp0);
1331	return (0);
1332}
1333
1334BUF *
1335allocbuf(BUF *bp, int fd, int blksize)
1336{
1337	size_t size;
1338#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1339	struct stat stb;
1340
1341	if (fstat(fd, &stb) < 0) {
1342		run_err("fstat: %s", strerror(errno));
1343		return (0);
1344	}
1345	size = ROUNDUP(stb.st_blksize, blksize);
1346	if (size == 0)
1347		size = blksize;
1348#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1349	size = blksize;
1350#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1351	if (bp->cnt >= size)
1352		return (bp);
1353	if (bp->buf == NULL)
1354		bp->buf = xmalloc(size);
1355	else
1356		bp->buf = xreallocarray(bp->buf, 1, size);
1357	memset(bp->buf, 0, size);
1358	bp->cnt = size;
1359	return (bp);
1360}
1361
1362void
1363lostconn(int signo)
1364{
1365	if (!iamremote)
1366		(void)write(STDERR_FILENO, "lost connection\n", 16);
1367	if (signo)
1368		_exit(1);
1369	else
1370		exit(1);
1371}
1372