scp.c revision 262566 
1/* $OpenBSD: scp.c,v 1.179 2013/11/20 20:53:10 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#include <sys/param.h>
78#ifdef HAVE_SYS_STAT_H
79# include <sys/stat.h>
80#endif
81#ifdef HAVE_POLL_H
82#include <poll.h>
83#else
84# ifdef HAVE_SYS_POLL_H
85#  include <sys/poll.h>
86# endif
87#endif
88#ifdef HAVE_SYS_TIME_H
89# include <sys/time.h>
90#endif
91#include <sys/wait.h>
92#include <sys/uio.h>
93
94#include <ctype.h>
95#include <dirent.h>
96#include <errno.h>
97#include <fcntl.h>
98#include <pwd.h>
99#include <signal.h>
100#include <stdarg.h>
101#include <stdio.h>
102#include <stdlib.h>
103#include <string.h>
104#include <time.h>
105#include <unistd.h>
106#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
107#include <vis.h>
108#endif
109
110#include "xmalloc.h"
111#include "atomicio.h"
112#include "pathnames.h"
113#include "log.h"
114#include "misc.h"
115#include "progressmeter.h"
116
117extern char *__progname;
118
119#define COPY_BUFLEN	16384
120
121int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
122int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
123
124/* Struct for addargs */
125arglist args;
126arglist remote_remote_args;
127
128/* Bandwidth limit */
129long long limit_kbps = 0;
130struct bwlimit bwlimit;
131
132/* Name of current file being transferred. */
133char *curfile;
134
135/* This is set to non-zero to enable verbose mode. */
136int verbose_mode = 0;
137
138/* This is set to zero if the progressmeter is not desired. */
139int showprogress = 1;
140
141/*
142 * This is set to non-zero if remote-remote copy should be piped
143 * through this process.
144 */
145int throughlocal = 0;
146
147/* This is the program to execute for the secured connection. ("ssh" or -S) */
148char *ssh_program = _PATH_SSH_PROGRAM;
149
150/* This is used to store the pid of ssh_program */
151pid_t do_cmd_pid = -1;
152
153static void
154killchild(int signo)
155{
156	if (do_cmd_pid > 1) {
157		kill(do_cmd_pid, signo ? signo : SIGTERM);
158		waitpid(do_cmd_pid, NULL, 0);
159	}
160
161	if (signo)
162		_exit(1);
163	exit(1);
164}
165
166static void
167suspchild(int signo)
168{
169	int status;
170
171	if (do_cmd_pid > 1) {
172		kill(do_cmd_pid, signo);
173		while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
174		    errno == EINTR)
175			;
176		kill(getpid(), SIGSTOP);
177	}
178}
179
180static int
181do_local_cmd(arglist *a)
182{
183	u_int i;
184	int status;
185	pid_t pid;
186
187	if (a->num == 0)
188		fatal("do_local_cmd: no arguments");
189
190	if (verbose_mode) {
191		fprintf(stderr, "Executing:");
192		for (i = 0; i < a->num; i++)
193			fprintf(stderr, " %s", a->list[i]);
194		fprintf(stderr, "\n");
195	}
196	if ((pid = fork()) == -1)
197		fatal("do_local_cmd: fork: %s", strerror(errno));
198
199	if (pid == 0) {
200		execvp(a->list[0], a->list);
201		perror(a->list[0]);
202		exit(1);
203	}
204
205	do_cmd_pid = pid;
206	signal(SIGTERM, killchild);
207	signal(SIGINT, killchild);
208	signal(SIGHUP, killchild);
209
210	while (waitpid(pid, &status, 0) == -1)
211		if (errno != EINTR)
212			fatal("do_local_cmd: waitpid: %s", strerror(errno));
213
214	do_cmd_pid = -1;
215
216	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
217		return (-1);
218
219	return (0);
220}
221
222/*
223 * This function executes the given command as the specified user on the
224 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
225 * assigns the input and output file descriptors on success.
226 */
227
228int
229do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
230{
231	int pin[2], pout[2], reserved[2];
232
233	if (verbose_mode)
234		fprintf(stderr,
235		    "Executing: program %s host %s, user %s, command %s\n",
236		    ssh_program, host,
237		    remuser ? remuser : "(unspecified)", cmd);
238
239	/*
240	 * Reserve two descriptors so that the real pipes won't get
241	 * descriptors 0 and 1 because that will screw up dup2 below.
242	 */
243	if (pipe(reserved) < 0)
244		fatal("pipe: %s", strerror(errno));
245
246	/* Create a socket pair for communicating with ssh. */
247	if (pipe(pin) < 0)
248		fatal("pipe: %s", strerror(errno));
249	if (pipe(pout) < 0)
250		fatal("pipe: %s", strerror(errno));
251
252	/* Free the reserved descriptors. */
253	close(reserved[0]);
254	close(reserved[1]);
255
256	signal(SIGTSTP, suspchild);
257	signal(SIGTTIN, suspchild);
258	signal(SIGTTOU, suspchild);
259
260	/* Fork a child to execute the command on the remote host using ssh. */
261	do_cmd_pid = fork();
262	if (do_cmd_pid == 0) {
263		/* Child. */
264		close(pin[1]);
265		close(pout[0]);
266		dup2(pin[0], 0);
267		dup2(pout[1], 1);
268		close(pin[0]);
269		close(pout[1]);
270
271		replacearg(&args, 0, "%s", ssh_program);
272		if (remuser != NULL) {
273			addargs(&args, "-l");
274			addargs(&args, "%s", remuser);
275		}
276		addargs(&args, "--");
277		addargs(&args, "%s", host);
278		addargs(&args, "%s", cmd);
279
280		execvp(ssh_program, args.list);
281		perror(ssh_program);
282		exit(1);
283	} else if (do_cmd_pid == -1) {
284		fatal("fork: %s", strerror(errno));
285	}
286	/* Parent.  Close the other side, and return the local side. */
287	close(pin[0]);
288	*fdout = pin[1];
289	close(pout[1]);
290	*fdin = pout[0];
291	signal(SIGTERM, killchild);
292	signal(SIGINT, killchild);
293	signal(SIGHUP, killchild);
294	return 0;
295}
296
297/*
298 * This functions executes a command simlar to do_cmd(), but expects the
299 * input and output descriptors to be setup by a previous call to do_cmd().
300 * This way the input and output of two commands can be connected.
301 */
302int
303do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
304{
305	pid_t pid;
306	int status;
307
308	if (verbose_mode)
309		fprintf(stderr,
310		    "Executing: 2nd program %s host %s, user %s, command %s\n",
311		    ssh_program, host,
312		    remuser ? remuser : "(unspecified)", cmd);
313
314	/* Fork a child to execute the command on the remote host using ssh. */
315	pid = fork();
316	if (pid == 0) {
317		dup2(fdin, 0);
318		dup2(fdout, 1);
319
320		replacearg(&args, 0, "%s", ssh_program);
321		if (remuser != NULL) {
322			addargs(&args, "-l");
323			addargs(&args, "%s", remuser);
324		}
325		addargs(&args, "--");
326		addargs(&args, "%s", host);
327		addargs(&args, "%s", cmd);
328
329		execvp(ssh_program, args.list);
330		perror(ssh_program);
331		exit(1);
332	} else if (pid == -1) {
333		fatal("fork: %s", strerror(errno));
334	}
335	while (waitpid(pid, &status, 0) == -1)
336		if (errno != EINTR)
337			fatal("do_cmd2: waitpid: %s", strerror(errno));
338	return 0;
339}
340
341typedef struct {
342	size_t cnt;
343	char *buf;
344} BUF;
345
346BUF *allocbuf(BUF *, int, int);
347void lostconn(int);
348int okname(char *);
349void run_err(const char *,...);
350void verifydir(char *);
351
352struct passwd *pwd;
353uid_t userid;
354int errs, remin, remout;
355int pflag, iamremote, iamrecursive, targetshouldbedirectory;
356
357#define	CMDNEEDS	64
358char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
359
360int response(void);
361void rsource(char *, struct stat *);
362void sink(int, char *[]);
363void source(int, char *[]);
364void tolocal(int, char *[]);
365void toremote(char *, int, char *[]);
366void usage(void);
367
368int
369main(int argc, char **argv)
370{
371	int ch, fflag, tflag, status, n;
372	char *targ, **newargv;
373	const char *errstr;
374	extern char *optarg;
375	extern int optind;
376
377	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
378	sanitise_stdfd();
379
380	/* Copy argv, because we modify it */
381	newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
382	for (n = 0; n < argc; n++)
383		newargv[n] = xstrdup(argv[n]);
384	argv = newargv;
385
386	__progname = ssh_get_progname(argv[0]);
387
388	memset(&args, '\0', sizeof(args));
389	memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
390	args.list = remote_remote_args.list = NULL;
391	addargs(&args, "%s", ssh_program);
392	addargs(&args, "-x");
393	addargs(&args, "-oForwardAgent=no");
394	addargs(&args, "-oPermitLocalCommand=no");
395	addargs(&args, "-oClearAllForwardings=yes");
396
397	fflag = tflag = 0;
398	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
399		switch (ch) {
400		/* User-visible flags. */
401		case '1':
402		case '2':
403		case '4':
404		case '6':
405		case 'C':
406			addargs(&args, "-%c", ch);
407			addargs(&remote_remote_args, "-%c", ch);
408			break;
409		case '3':
410			throughlocal = 1;
411			break;
412		case 'o':
413		case 'c':
414		case 'i':
415		case 'F':
416			addargs(&remote_remote_args, "-%c", ch);
417			addargs(&remote_remote_args, "%s", optarg);
418			addargs(&args, "-%c", ch);
419			addargs(&args, "%s", optarg);
420			break;
421		case 'P':
422			addargs(&remote_remote_args, "-p");
423			addargs(&remote_remote_args, "%s", optarg);
424			addargs(&args, "-p");
425			addargs(&args, "%s", optarg);
426			break;
427		case 'B':
428			addargs(&remote_remote_args, "-oBatchmode=yes");
429			addargs(&args, "-oBatchmode=yes");
430			break;
431		case 'l':
432			limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
433			    &errstr);
434			if (errstr != NULL)
435				usage();
436			limit_kbps *= 1024; /* kbps */
437			bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
438			break;
439		case 'p':
440			pflag = 1;
441			break;
442		case 'r':
443			iamrecursive = 1;
444			break;
445		case 'S':
446			ssh_program = xstrdup(optarg);
447			break;
448		case 'v':
449			addargs(&args, "-v");
450			addargs(&remote_remote_args, "-v");
451			verbose_mode = 1;
452			break;
453		case 'q':
454			addargs(&args, "-q");
455			addargs(&remote_remote_args, "-q");
456			showprogress = 0;
457			break;
458
459		/* Server options. */
460		case 'd':
461			targetshouldbedirectory = 1;
462			break;
463		case 'f':	/* "from" */
464			iamremote = 1;
465			fflag = 1;
466			break;
467		case 't':	/* "to" */
468			iamremote = 1;
469			tflag = 1;
470#ifdef HAVE_CYGWIN
471			setmode(0, O_BINARY);
472#endif
473			break;
474		default:
475			usage();
476		}
477	argc -= optind;
478	argv += optind;
479
480	if ((pwd = getpwuid(userid = getuid())) == NULL)
481		fatal("unknown user %u", (u_int) userid);
482
483	if (!isatty(STDOUT_FILENO))
484		showprogress = 0;
485
486	remin = STDIN_FILENO;
487	remout = STDOUT_FILENO;
488
489	if (fflag) {
490		/* Follow "protocol", send data. */
491		(void) response();
492		source(argc, argv);
493		exit(errs != 0);
494	}
495	if (tflag) {
496		/* Receive data. */
497		sink(argc, argv);
498		exit(errs != 0);
499	}
500	if (argc < 2)
501		usage();
502	if (argc > 2)
503		targetshouldbedirectory = 1;
504
505	remin = remout = -1;
506	do_cmd_pid = -1;
507	/* Command to be executed on remote system using "ssh". */
508	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
509	    verbose_mode ? " -v" : "",
510	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
511	    targetshouldbedirectory ? " -d" : "");
512
513	(void) signal(SIGPIPE, lostconn);
514
515	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
516		toremote(targ, argc, argv);
517	else {
518		if (targetshouldbedirectory)
519			verifydir(argv[argc - 1]);
520		tolocal(argc, argv);	/* Dest is local host. */
521	}
522	/*
523	 * Finally check the exit status of the ssh process, if one was forked
524	 * and no error has occurred yet
525	 */
526	if (do_cmd_pid != -1 && errs == 0) {
527		if (remin != -1)
528		    (void) close(remin);
529		if (remout != -1)
530		    (void) close(remout);
531		if (waitpid(do_cmd_pid, &status, 0) == -1)
532			errs = 1;
533		else {
534			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
535				errs = 1;
536		}
537	}
538	exit(errs != 0);
539}
540
541/* Callback from atomicio6 to update progress meter and limit bandwidth */
542static int
543scpio(void *_cnt, size_t s)
544{
545	off_t *cnt = (off_t *)_cnt;
546
547	*cnt += s;
548	if (limit_kbps > 0)
549		bandwidth_limit(&bwlimit, s);
550	return 0;
551}
552
553static int
554do_times(int fd, int verb, const struct stat *sb)
555{
556	/* strlen(2^64) == 20; strlen(10^6) == 7 */
557	char buf[(20 + 7 + 2) * 2 + 2];
558
559	(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
560	    (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
561	    (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
562	if (verb) {
563		fprintf(stderr, "File mtime %lld atime %lld\n",
564		    (long long)sb->st_mtime, (long long)sb->st_atime);
565		fprintf(stderr, "Sending file timestamps: %s", buf);
566	}
567	(void) atomicio(vwrite, fd, buf, strlen(buf));
568	return (response());
569}
570
571void
572toremote(char *targ, int argc, char **argv)
573{
574	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
575	arglist alist;
576	int i;
577	u_int j;
578
579	memset(&alist, '\0', sizeof(alist));
580	alist.list = NULL;
581
582	*targ++ = 0;
583	if (*targ == 0)
584		targ = ".";
585
586	arg = xstrdup(argv[argc - 1]);
587	if ((thost = strrchr(arg, '@'))) {
588		/* user@host */
589		*thost++ = 0;
590		tuser = arg;
591		if (*tuser == '\0')
592			tuser = NULL;
593	} else {
594		thost = arg;
595		tuser = NULL;
596	}
597
598	if (tuser != NULL && !okname(tuser)) {
599		free(arg);
600		return;
601	}
602
603	for (i = 0; i < argc - 1; i++) {
604		src = colon(argv[i]);
605		if (src && throughlocal) {	/* extended remote to remote */
606			*src++ = 0;
607			if (*src == 0)
608				src = ".";
609			host = strrchr(argv[i], '@');
610			if (host) {
611				*host++ = 0;
612				host = cleanhostname(host);
613				suser = argv[i];
614				if (*suser == '\0')
615					suser = pwd->pw_name;
616				else if (!okname(suser))
617					continue;
618			} else {
619				host = cleanhostname(argv[i]);
620				suser = NULL;
621			}
622			xasprintf(&bp, "%s -f %s%s", cmd,
623			    *src == '-' ? "-- " : "", src);
624			if (do_cmd(host, suser, bp, &remin, &remout) < 0)
625				exit(1);
626			free(bp);
627			host = cleanhostname(thost);
628			xasprintf(&bp, "%s -t %s%s", cmd,
629			    *targ == '-' ? "-- " : "", targ);
630			if (do_cmd2(host, tuser, bp, remin, remout) < 0)
631				exit(1);
632			free(bp);
633			(void) close(remin);
634			(void) close(remout);
635			remin = remout = -1;
636		} else if (src) {	/* standard remote to remote */
637			freeargs(&alist);
638			addargs(&alist, "%s", ssh_program);
639			addargs(&alist, "-x");
640			addargs(&alist, "-oClearAllForwardings=yes");
641			addargs(&alist, "-n");
642			for (j = 0; j < remote_remote_args.num; j++) {
643				addargs(&alist, "%s",
644				    remote_remote_args.list[j]);
645			}
646			*src++ = 0;
647			if (*src == 0)
648				src = ".";
649			host = strrchr(argv[i], '@');
650
651			if (host) {
652				*host++ = 0;
653				host = cleanhostname(host);
654				suser = argv[i];
655				if (*suser == '\0')
656					suser = pwd->pw_name;
657				else if (!okname(suser))
658					continue;
659				addargs(&alist, "-l");
660				addargs(&alist, "%s", suser);
661			} else {
662				host = cleanhostname(argv[i]);
663			}
664			addargs(&alist, "--");
665			addargs(&alist, "%s", host);
666			addargs(&alist, "%s", cmd);
667			addargs(&alist, "%s", src);
668			addargs(&alist, "%s%s%s:%s",
669			    tuser ? tuser : "", tuser ? "@" : "",
670			    thost, targ);
671			if (do_local_cmd(&alist) != 0)
672				errs = 1;
673		} else {	/* local to remote */
674			if (remin == -1) {
675				xasprintf(&bp, "%s -t %s%s", cmd,
676				    *targ == '-' ? "-- " : "", targ);
677				host = cleanhostname(thost);
678				if (do_cmd(host, tuser, bp, &remin,
679				    &remout) < 0)
680					exit(1);
681				if (response() < 0)
682					exit(1);
683				free(bp);
684			}
685			source(1, argv + i);
686		}
687	}
688	free(arg);
689}
690
691void
692tolocal(int argc, char **argv)
693{
694	char *bp, *host, *src, *suser;
695	arglist alist;
696	int i;
697
698	memset(&alist, '\0', sizeof(alist));
699	alist.list = NULL;
700
701	for (i = 0; i < argc - 1; i++) {
702		if (!(src = colon(argv[i]))) {	/* Local to local. */
703			freeargs(&alist);
704			addargs(&alist, "%s", _PATH_CP);
705			if (iamrecursive)
706				addargs(&alist, "-r");
707			if (pflag)
708				addargs(&alist, "-p");
709			addargs(&alist, "--");
710			addargs(&alist, "%s", argv[i]);
711			addargs(&alist, "%s", argv[argc-1]);
712			if (do_local_cmd(&alist))
713				++errs;
714			continue;
715		}
716		*src++ = 0;
717		if (*src == 0)
718			src = ".";
719		if ((host = strrchr(argv[i], '@')) == NULL) {
720			host = argv[i];
721			suser = NULL;
722		} else {
723			*host++ = 0;
724			suser = argv[i];
725			if (*suser == '\0')
726				suser = pwd->pw_name;
727		}
728		host = cleanhostname(host);
729		xasprintf(&bp, "%s -f %s%s",
730		    cmd, *src == '-' ? "-- " : "", src);
731		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
732			free(bp);
733			++errs;
734			continue;
735		}
736		free(bp);
737		sink(1, argv + argc - 1);
738		(void) close(remin);
739		remin = remout = -1;
740	}
741}
742
743void
744source(int argc, char **argv)
745{
746	struct stat stb;
747	static BUF buffer;
748	BUF *bp;
749	off_t i, statbytes;
750	size_t amt;
751	int fd = -1, haderr, indx;
752	char *last, *name, buf[2048], encname[MAXPATHLEN];
753	int len;
754
755	for (indx = 0; indx < argc; ++indx) {
756		name = argv[indx];
757		statbytes = 0;
758		len = strlen(name);
759		while (len > 1 && name[len-1] == '/')
760			name[--len] = '\0';
761		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
762			goto syserr;
763		if (strchr(name, '\n') != NULL) {
764			strnvis(encname, name, sizeof(encname), VIS_NL);
765			name = encname;
766		}
767		if (fstat(fd, &stb) < 0) {
768syserr:			run_err("%s: %s", name, strerror(errno));
769			goto next;
770		}
771		if (stb.st_size < 0) {
772			run_err("%s: %s", name, "Negative file size");
773			goto next;
774		}
775		unset_nonblock(fd);
776		switch (stb.st_mode & S_IFMT) {
777		case S_IFREG:
778			break;
779		case S_IFDIR:
780			if (iamrecursive) {
781				rsource(name, &stb);
782				goto next;
783			}
784			/* FALLTHROUGH */
785		default:
786			run_err("%s: not a regular file", name);
787			goto next;
788		}
789		if ((last = strrchr(name, '/')) == NULL)
790			last = name;
791		else
792			++last;
793		curfile = last;
794		if (pflag) {
795			if (do_times(remout, verbose_mode, &stb) < 0)
796				goto next;
797		}
798#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
799		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
800		    (u_int) (stb.st_mode & FILEMODEMASK),
801		    (long long)stb.st_size, last);
802		if (verbose_mode) {
803			fprintf(stderr, "Sending file modes: %s", buf);
804		}
805		(void) atomicio(vwrite, remout, buf, strlen(buf));
806		if (response() < 0)
807			goto next;
808		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
809next:			if (fd != -1) {
810				(void) close(fd);
811				fd = -1;
812			}
813			continue;
814		}
815		if (showprogress)
816			start_progress_meter(curfile, stb.st_size, &statbytes);
817		set_nonblock(remout);
818		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
819			amt = bp->cnt;
820			if (i + (off_t)amt > stb.st_size)
821				amt = stb.st_size - i;
822			if (!haderr) {
823				if (atomicio(read, fd, bp->buf, amt) != amt)
824					haderr = errno;
825			}
826			/* Keep writing after error to retain sync */
827			if (haderr) {
828				(void)atomicio(vwrite, remout, bp->buf, amt);
829				continue;
830			}
831			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
832			    &statbytes) != amt)
833				haderr = errno;
834		}
835		unset_nonblock(remout);
836		if (showprogress)
837			stop_progress_meter();
838
839		if (fd != -1) {
840			if (close(fd) < 0 && !haderr)
841				haderr = errno;
842			fd = -1;
843		}
844		if (!haderr)
845			(void) atomicio(vwrite, remout, "", 1);
846		else
847			run_err("%s: %s", name, strerror(haderr));
848		(void) response();
849	}
850}
851
852void
853rsource(char *name, struct stat *statp)
854{
855	DIR *dirp;
856	struct dirent *dp;
857	char *last, *vect[1], path[MAXPATHLEN];
858
859	if (!(dirp = opendir(name))) {
860		run_err("%s: %s", name, strerror(errno));
861		return;
862	}
863	last = strrchr(name, '/');
864	if (last == 0)
865		last = name;
866	else
867		last++;
868	if (pflag) {
869		if (do_times(remout, verbose_mode, statp) < 0) {
870			closedir(dirp);
871			return;
872		}
873	}
874	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
875	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
876	if (verbose_mode)
877		fprintf(stderr, "Entering directory: %s", path);
878	(void) atomicio(vwrite, remout, path, strlen(path));
879	if (response() < 0) {
880		closedir(dirp);
881		return;
882	}
883	while ((dp = readdir(dirp)) != NULL) {
884		if (dp->d_ino == 0)
885			continue;
886		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
887			continue;
888		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
889			run_err("%s/%s: name too long", name, dp->d_name);
890			continue;
891		}
892		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
893		vect[0] = path;
894		source(1, vect);
895	}
896	(void) closedir(dirp);
897	(void) atomicio(vwrite, remout, "E\n", 2);
898	(void) response();
899}
900
901void
902sink(int argc, char **argv)
903{
904	static BUF buffer;
905	struct stat stb;
906	enum {
907		YES, NO, DISPLAYED
908	} wrerr;
909	BUF *bp;
910	off_t i;
911	size_t j, count;
912	int amt, exists, first, ofd;
913	mode_t mode, omode, mask;
914	off_t size, statbytes;
915	unsigned long long ull;
916	int setimes, targisdir, wrerrno = 0;
917	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
918	struct timeval tv[2];
919
920#define	atime	tv[0]
921#define	mtime	tv[1]
922#define	SCREWUP(str)	{ why = str; goto screwup; }
923
924	setimes = targisdir = 0;
925	mask = umask(0);
926	if (!pflag)
927		(void) umask(mask);
928	if (argc != 1) {
929		run_err("ambiguous target");
930		exit(1);
931	}
932	targ = *argv;
933	if (targetshouldbedirectory)
934		verifydir(targ);
935
936	(void) atomicio(vwrite, remout, "", 1);
937	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
938		targisdir = 1;
939	for (first = 1;; first = 0) {
940		cp = buf;
941		if (atomicio(read, remin, cp, 1) != 1)
942			return;
943		if (*cp++ == '\n')
944			SCREWUP("unexpected <newline>");
945		do {
946			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
947				SCREWUP("lost connection");
948			*cp++ = ch;
949		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
950		*cp = 0;
951		if (verbose_mode)
952			fprintf(stderr, "Sink: %s", buf);
953
954		if (buf[0] == '\01' || buf[0] == '\02') {
955			if (iamremote == 0)
956				(void) atomicio(vwrite, STDERR_FILENO,
957				    buf + 1, strlen(buf + 1));
958			if (buf[0] == '\02')
959				exit(1);
960			++errs;
961			continue;
962		}
963		if (buf[0] == 'E') {
964			(void) atomicio(vwrite, remout, "", 1);
965			return;
966		}
967		if (ch == '\n')
968			*--cp = 0;
969
970		cp = buf;
971		if (*cp == 'T') {
972			setimes++;
973			cp++;
974			if (!isdigit((unsigned char)*cp))
975				SCREWUP("mtime.sec not present");
976			ull = strtoull(cp, &cp, 10);
977			if (!cp || *cp++ != ' ')
978				SCREWUP("mtime.sec not delimited");
979			if ((time_t)ull < 0 ||
980			    (unsigned long long)(time_t)ull != ull)
981				setimes = 0;	/* out of range */
982			mtime.tv_sec = ull;
983			mtime.tv_usec = strtol(cp, &cp, 10);
984			if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
985			    mtime.tv_usec > 999999)
986				SCREWUP("mtime.usec not delimited");
987			if (!isdigit((unsigned char)*cp))
988				SCREWUP("atime.sec not present");
989			ull = strtoull(cp, &cp, 10);
990			if (!cp || *cp++ != ' ')
991				SCREWUP("atime.sec not delimited");
992			if ((time_t)ull < 0 ||
993			    (unsigned long long)(time_t)ull != ull)
994				setimes = 0;	/* out of range */
995			atime.tv_sec = ull;
996			atime.tv_usec = strtol(cp, &cp, 10);
997			if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
998			    atime.tv_usec > 999999)
999				SCREWUP("atime.usec not delimited");
1000			(void) atomicio(vwrite, remout, "", 1);
1001			continue;
1002		}
1003		if (*cp != 'C' && *cp != 'D') {
1004			/*
1005			 * Check for the case "rcp remote:foo\* local:bar".
1006			 * In this case, the line "No match." can be returned
1007			 * by the shell before the rcp command on the remote is
1008			 * executed so the ^Aerror_message convention isn't
1009			 * followed.
1010			 */
1011			if (first) {
1012				run_err("%s", cp);
1013				exit(1);
1014			}
1015			SCREWUP("expected control record");
1016		}
1017		mode = 0;
1018		for (++cp; cp < buf + 5; cp++) {
1019			if (*cp < '0' || *cp > '7')
1020				SCREWUP("bad mode");
1021			mode = (mode << 3) | (*cp - '0');
1022		}
1023		if (*cp++ != ' ')
1024			SCREWUP("mode not delimited");
1025
1026		for (size = 0; isdigit((unsigned char)*cp);)
1027			size = size * 10 + (*cp++ - '0');
1028		if (*cp++ != ' ')
1029			SCREWUP("size not delimited");
1030		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1031			run_err("error: unexpected filename: %s", cp);
1032			exit(1);
1033		}
1034		if (targisdir) {
1035			static char *namebuf;
1036			static size_t cursize;
1037			size_t need;
1038
1039			need = strlen(targ) + strlen(cp) + 250;
1040			if (need > cursize) {
1041				free(namebuf);
1042				namebuf = xmalloc(need);
1043				cursize = need;
1044			}
1045			(void) snprintf(namebuf, need, "%s%s%s", targ,
1046			    strcmp(targ, "/") ? "/" : "", cp);
1047			np = namebuf;
1048		} else
1049			np = targ;
1050		curfile = cp;
1051		exists = stat(np, &stb) == 0;
1052		if (buf[0] == 'D') {
1053			int mod_flag = pflag;
1054			if (!iamrecursive)
1055				SCREWUP("received directory without -r");
1056			if (exists) {
1057				if (!S_ISDIR(stb.st_mode)) {
1058					errno = ENOTDIR;
1059					goto bad;
1060				}
1061				if (pflag)
1062					(void) chmod(np, mode);
1063			} else {
1064				/* Handle copying from a read-only
1065				   directory */
1066				mod_flag = 1;
1067				if (mkdir(np, mode | S_IRWXU) < 0)
1068					goto bad;
1069			}
1070			vect[0] = xstrdup(np);
1071			sink(1, vect);
1072			if (setimes) {
1073				setimes = 0;
1074				if (utimes(vect[0], tv) < 0)
1075					run_err("%s: set times: %s",
1076					    vect[0], strerror(errno));
1077			}
1078			if (mod_flag)
1079				(void) chmod(vect[0], mode);
1080			free(vect[0]);
1081			continue;
1082		}
1083		omode = mode;
1084		mode |= S_IWUSR;
1085		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1086bad:			run_err("%s: %s", np, strerror(errno));
1087			continue;
1088		}
1089		(void) atomicio(vwrite, remout, "", 1);
1090		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1091			(void) close(ofd);
1092			continue;
1093		}
1094		cp = bp->buf;
1095		wrerr = NO;
1096
1097		statbytes = 0;
1098		if (showprogress)
1099			start_progress_meter(curfile, size, &statbytes);
1100		set_nonblock(remin);
1101		for (count = i = 0; i < size; i += bp->cnt) {
1102			amt = bp->cnt;
1103			if (i + amt > size)
1104				amt = size - i;
1105			count += amt;
1106			do {
1107				j = atomicio6(read, remin, cp, amt,
1108				    scpio, &statbytes);
1109				if (j == 0) {
1110					run_err("%s", j != EPIPE ?
1111					    strerror(errno) :
1112					    "dropped connection");
1113					exit(1);
1114				}
1115				amt -= j;
1116				cp += j;
1117			} while (amt > 0);
1118
1119			if (count == bp->cnt) {
1120				/* Keep reading so we stay sync'd up. */
1121				if (wrerr == NO) {
1122					if (atomicio(vwrite, ofd, bp->buf,
1123					    count) != count) {
1124						wrerr = YES;
1125						wrerrno = errno;
1126					}
1127				}
1128				count = 0;
1129				cp = bp->buf;
1130			}
1131		}
1132		unset_nonblock(remin);
1133		if (showprogress)
1134			stop_progress_meter();
1135		if (count != 0 && wrerr == NO &&
1136		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1137			wrerr = YES;
1138			wrerrno = errno;
1139		}
1140		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1141		    ftruncate(ofd, size) != 0) {
1142			run_err("%s: truncate: %s", np, strerror(errno));
1143			wrerr = DISPLAYED;
1144		}
1145		if (pflag) {
1146			if (exists || omode != mode)
1147#ifdef HAVE_FCHMOD
1148				if (fchmod(ofd, omode)) {
1149#else /* HAVE_FCHMOD */
1150				if (chmod(np, omode)) {
1151#endif /* HAVE_FCHMOD */
1152					run_err("%s: set mode: %s",
1153					    np, strerror(errno));
1154					wrerr = DISPLAYED;
1155				}
1156		} else {
1157			if (!exists && omode != mode)
1158#ifdef HAVE_FCHMOD
1159				if (fchmod(ofd, omode & ~mask)) {
1160#else /* HAVE_FCHMOD */
1161				if (chmod(np, omode & ~mask)) {
1162#endif /* HAVE_FCHMOD */
1163					run_err("%s: set mode: %s",
1164					    np, strerror(errno));
1165					wrerr = DISPLAYED;
1166				}
1167		}
1168		if (close(ofd) == -1) {
1169			wrerr = YES;
1170			wrerrno = errno;
1171		}
1172		(void) response();
1173		if (setimes && wrerr == NO) {
1174			setimes = 0;
1175			if (utimes(np, tv) < 0) {
1176				run_err("%s: set times: %s",
1177				    np, strerror(errno));
1178				wrerr = DISPLAYED;
1179			}
1180		}
1181		switch (wrerr) {
1182		case YES:
1183			run_err("%s: %s", np, strerror(wrerrno));
1184			break;
1185		case NO:
1186			(void) atomicio(vwrite, remout, "", 1);
1187			break;
1188		case DISPLAYED:
1189			break;
1190		}
1191	}
1192screwup:
1193	run_err("protocol error: %s", why);
1194	exit(1);
1195}
1196
1197int
1198response(void)
1199{
1200	char ch, *cp, resp, rbuf[2048];
1201
1202	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1203		lostconn(0);
1204
1205	cp = rbuf;
1206	switch (resp) {
1207	case 0:		/* ok */
1208		return (0);
1209	default:
1210		*cp++ = resp;
1211		/* FALLTHROUGH */
1212	case 1:		/* error, followed by error msg */
1213	case 2:		/* fatal error, "" */
1214		do {
1215			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1216				lostconn(0);
1217			*cp++ = ch;
1218		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1219
1220		if (!iamremote)
1221			(void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1222		++errs;
1223		if (resp == 1)
1224			return (-1);
1225		exit(1);
1226	}
1227	/* NOTREACHED */
1228}
1229
1230void
1231usage(void)
1232{
1233	(void) fprintf(stderr,
1234	    "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1235	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1236	    "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1237	exit(1);
1238}
1239
1240void
1241run_err(const char *fmt,...)
1242{
1243	static FILE *fp;
1244	va_list ap;
1245
1246	++errs;
1247	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1248		(void) fprintf(fp, "%c", 0x01);
1249		(void) fprintf(fp, "scp: ");
1250		va_start(ap, fmt);
1251		(void) vfprintf(fp, fmt, ap);
1252		va_end(ap);
1253		(void) fprintf(fp, "\n");
1254		(void) fflush(fp);
1255	}
1256
1257	if (!iamremote) {
1258		va_start(ap, fmt);
1259		vfprintf(stderr, fmt, ap);
1260		va_end(ap);
1261		fprintf(stderr, "\n");
1262	}
1263}
1264
1265void
1266verifydir(char *cp)
1267{
1268	struct stat stb;
1269
1270	if (!stat(cp, &stb)) {
1271		if (S_ISDIR(stb.st_mode))
1272			return;
1273		errno = ENOTDIR;
1274	}
1275	run_err("%s: %s", cp, strerror(errno));
1276	killchild(0);
1277}
1278
1279int
1280okname(char *cp0)
1281{
1282	int c;
1283	char *cp;
1284
1285	cp = cp0;
1286	do {
1287		c = (int)*cp;
1288		if (c & 0200)
1289			goto bad;
1290		if (!isalpha(c) && !isdigit((unsigned char)c)) {
1291			switch (c) {
1292			case '\'':
1293			case '"':
1294			case '`':
1295			case ' ':
1296			case '#':
1297				goto bad;
1298			default:
1299				break;
1300			}
1301		}
1302	} while (*++cp);
1303	return (1);
1304
1305bad:	fprintf(stderr, "%s: invalid user name\n", cp0);
1306	return (0);
1307}
1308
1309BUF *
1310allocbuf(BUF *bp, int fd, int blksize)
1311{
1312	size_t size;
1313#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1314	struct stat stb;
1315
1316	if (fstat(fd, &stb) < 0) {
1317		run_err("fstat: %s", strerror(errno));
1318		return (0);
1319	}
1320	size = roundup(stb.st_blksize, blksize);
1321	if (size == 0)
1322		size = blksize;
1323#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1324	size = blksize;
1325#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1326	if (bp->cnt >= size)
1327		return (bp);
1328	if (bp->buf == NULL)
1329		bp->buf = xmalloc(size);
1330	else
1331		bp->buf = xrealloc(bp->buf, 1, size);
1332	memset(bp->buf, 0, size);
1333	bp->cnt = size;
1334	return (bp);
1335}
1336
1337void
1338lostconn(int signo)
1339{
1340	if (!iamremote)
1341		(void)write(STDERR_FILENO, "lost connection\n", 16);
1342	if (signo)
1343		_exit(1);
1344	else
1345		exit(1);
1346}
1347