scp.c revision 323129 
1/* $OpenBSD: scp.c,v 1.186 2016/05/25 23:48:45 schwarze 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 <limits.h>
99#include <locale.h>
100#include <pwd.h>
101#include <signal.h>
102#include <stdarg.h>
103#include <stdio.h>
104#include <stdlib.h>
105#include <string.h>
106#include <time.h>
107#include <unistd.h>
108#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
109#include <vis.h>
110#endif
111
112#include "xmalloc.h"
113#include "atomicio.h"
114#include "pathnames.h"
115#include "log.h"
116#include "misc.h"
117#include "progressmeter.h"
118#include "utf8.h"
119
120extern char *__progname;
121
122#define COPY_BUFLEN	16384
123
124int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
125int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
126
127/* Struct for addargs */
128arglist args;
129arglist remote_remote_args;
130
131/* Bandwidth limit */
132long long limit_kbps = 0;
133struct bwlimit bwlimit;
134
135/* Name of current file being transferred. */
136char *curfile;
137
138/* This is set to non-zero to enable verbose mode. */
139int verbose_mode = 0;
140
141/* This is set to zero if the progressmeter is not desired. */
142int showprogress = 1;
143
144/*
145 * This is set to non-zero if remote-remote copy should be piped
146 * through this process.
147 */
148int throughlocal = 0;
149
150/* This is the program to execute for the secured connection. ("ssh" or -S) */
151char *ssh_program = _PATH_SSH_PROGRAM;
152
153/* This is used to store the pid of ssh_program */
154pid_t do_cmd_pid = -1;
155
156static void
157killchild(int signo)
158{
159	if (do_cmd_pid > 1) {
160		kill(do_cmd_pid, signo ? signo : SIGTERM);
161		waitpid(do_cmd_pid, NULL, 0);
162	}
163
164	if (signo)
165		_exit(1);
166	exit(1);
167}
168
169static void
170suspchild(int signo)
171{
172	int status;
173
174	if (do_cmd_pid > 1) {
175		kill(do_cmd_pid, signo);
176		while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
177		    errno == EINTR)
178			;
179		kill(getpid(), SIGSTOP);
180	}
181}
182
183static int
184do_local_cmd(arglist *a)
185{
186	u_int i;
187	int status;
188	pid_t pid;
189
190	if (a->num == 0)
191		fatal("do_local_cmd: no arguments");
192
193	if (verbose_mode) {
194		fprintf(stderr, "Executing:");
195		for (i = 0; i < a->num; i++)
196			fmprintf(stderr, " %s", a->list[i]);
197		fprintf(stderr, "\n");
198	}
199	if ((pid = fork()) == -1)
200		fatal("do_local_cmd: fork: %s", strerror(errno));
201
202	if (pid == 0) {
203		execvp(a->list[0], a->list);
204		perror(a->list[0]);
205		exit(1);
206	}
207
208	do_cmd_pid = pid;
209	signal(SIGTERM, killchild);
210	signal(SIGINT, killchild);
211	signal(SIGHUP, killchild);
212
213	while (waitpid(pid, &status, 0) == -1)
214		if (errno != EINTR)
215			fatal("do_local_cmd: waitpid: %s", strerror(errno));
216
217	do_cmd_pid = -1;
218
219	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
220		return (-1);
221
222	return (0);
223}
224
225/*
226 * This function executes the given command as the specified user on the
227 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
228 * assigns the input and output file descriptors on success.
229 */
230
231int
232do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
233{
234	int pin[2], pout[2], reserved[2];
235
236	if (verbose_mode)
237		fmprintf(stderr,
238		    "Executing: program %s host %s, user %s, command %s\n",
239		    ssh_program, host,
240		    remuser ? remuser : "(unspecified)", cmd);
241
242	/*
243	 * Reserve two descriptors so that the real pipes won't get
244	 * descriptors 0 and 1 because that will screw up dup2 below.
245	 */
246	if (pipe(reserved) < 0)
247		fatal("pipe: %s", strerror(errno));
248
249	/* Create a socket pair for communicating with ssh. */
250	if (pipe(pin) < 0)
251		fatal("pipe: %s", strerror(errno));
252	if (pipe(pout) < 0)
253		fatal("pipe: %s", strerror(errno));
254
255	/* Free the reserved descriptors. */
256	close(reserved[0]);
257	close(reserved[1]);
258
259	signal(SIGTSTP, suspchild);
260	signal(SIGTTIN, suspchild);
261	signal(SIGTTOU, suspchild);
262
263	/* Fork a child to execute the command on the remote host using ssh. */
264	do_cmd_pid = fork();
265	if (do_cmd_pid == 0) {
266		/* Child. */
267		close(pin[1]);
268		close(pout[0]);
269		dup2(pin[0], 0);
270		dup2(pout[1], 1);
271		close(pin[0]);
272		close(pout[1]);
273
274		replacearg(&args, 0, "%s", ssh_program);
275		if (remuser != NULL) {
276			addargs(&args, "-l");
277			addargs(&args, "%s", remuser);
278		}
279		addargs(&args, "--");
280		addargs(&args, "%s", host);
281		addargs(&args, "%s", cmd);
282
283		execvp(ssh_program, args.list);
284		perror(ssh_program);
285		exit(1);
286	} else if (do_cmd_pid == -1) {
287		fatal("fork: %s", strerror(errno));
288	}
289	/* Parent.  Close the other side, and return the local side. */
290	close(pin[0]);
291	*fdout = pin[1];
292	close(pout[1]);
293	*fdin = pout[0];
294	signal(SIGTERM, killchild);
295	signal(SIGINT, killchild);
296	signal(SIGHUP, killchild);
297	return 0;
298}
299
300/*
301 * This functions executes a command simlar to do_cmd(), but expects the
302 * input and output descriptors to be setup by a previous call to do_cmd().
303 * This way the input and output of two commands can be connected.
304 */
305int
306do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
307{
308	pid_t pid;
309	int status;
310
311	if (verbose_mode)
312		fmprintf(stderr,
313		    "Executing: 2nd program %s host %s, user %s, command %s\n",
314		    ssh_program, host,
315		    remuser ? remuser : "(unspecified)", cmd);
316
317	/* Fork a child to execute the command on the remote host using ssh. */
318	pid = fork();
319	if (pid == 0) {
320		dup2(fdin, 0);
321		dup2(fdout, 1);
322
323		replacearg(&args, 0, "%s", ssh_program);
324		if (remuser != NULL) {
325			addargs(&args, "-l");
326			addargs(&args, "%s", remuser);
327		}
328		addargs(&args, "--");
329		addargs(&args, "%s", host);
330		addargs(&args, "%s", cmd);
331
332		execvp(ssh_program, args.list);
333		perror(ssh_program);
334		exit(1);
335	} else if (pid == -1) {
336		fatal("fork: %s", strerror(errno));
337	}
338	while (waitpid(pid, &status, 0) == -1)
339		if (errno != EINTR)
340			fatal("do_cmd2: waitpid: %s", strerror(errno));
341	return 0;
342}
343
344typedef struct {
345	size_t cnt;
346	char *buf;
347} BUF;
348
349BUF *allocbuf(BUF *, int, int);
350void lostconn(int);
351int okname(char *);
352void run_err(const char *,...);
353void verifydir(char *);
354
355struct passwd *pwd;
356uid_t userid;
357int errs, remin, remout;
358int pflag, iamremote, iamrecursive, targetshouldbedirectory;
359
360#define	CMDNEEDS	64
361char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
362
363int response(void);
364void rsource(char *, struct stat *);
365void sink(int, char *[]);
366void source(int, char *[]);
367void tolocal(int, char *[]);
368void toremote(char *, int, char *[]);
369void usage(void);
370
371int
372main(int argc, char **argv)
373{
374	int ch, fflag, tflag, status, n;
375	char *targ, **newargv;
376	const char *errstr;
377	extern char *optarg;
378	extern int optind;
379
380	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
381	sanitise_stdfd();
382
383	setlocale(LC_CTYPE, "");
384
385	/* Copy argv, because we modify it */
386	newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
387	for (n = 0; n < argc; n++)
388		newargv[n] = xstrdup(argv[n]);
389	argv = newargv;
390
391	__progname = ssh_get_progname(argv[0]);
392
393	memset(&args, '\0', sizeof(args));
394	memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
395	args.list = remote_remote_args.list = NULL;
396	addargs(&args, "%s", ssh_program);
397	addargs(&args, "-x");
398	addargs(&args, "-oForwardAgent=no");
399	addargs(&args, "-oPermitLocalCommand=no");
400	addargs(&args, "-oClearAllForwardings=yes");
401
402	fflag = tflag = 0;
403	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
404		switch (ch) {
405		/* User-visible flags. */
406		case '1':
407		case '2':
408		case '4':
409		case '6':
410		case 'C':
411			addargs(&args, "-%c", ch);
412			addargs(&remote_remote_args, "-%c", ch);
413			break;
414		case '3':
415			throughlocal = 1;
416			break;
417		case 'o':
418		case 'c':
419		case 'i':
420		case 'F':
421			addargs(&remote_remote_args, "-%c", ch);
422			addargs(&remote_remote_args, "%s", optarg);
423			addargs(&args, "-%c", ch);
424			addargs(&args, "%s", optarg);
425			break;
426		case 'P':
427			addargs(&remote_remote_args, "-p");
428			addargs(&remote_remote_args, "%s", optarg);
429			addargs(&args, "-p");
430			addargs(&args, "%s", optarg);
431			break;
432		case 'B':
433			addargs(&remote_remote_args, "-oBatchmode=yes");
434			addargs(&args, "-oBatchmode=yes");
435			break;
436		case 'l':
437			limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
438			    &errstr);
439			if (errstr != NULL)
440				usage();
441			limit_kbps *= 1024; /* kbps */
442			bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
443			break;
444		case 'p':
445			pflag = 1;
446			break;
447		case 'r':
448			iamrecursive = 1;
449			break;
450		case 'S':
451			ssh_program = xstrdup(optarg);
452			break;
453		case 'v':
454			addargs(&args, "-v");
455			addargs(&remote_remote_args, "-v");
456			verbose_mode = 1;
457			break;
458		case 'q':
459			addargs(&args, "-q");
460			addargs(&remote_remote_args, "-q");
461			showprogress = 0;
462			break;
463
464		/* Server options. */
465		case 'd':
466			targetshouldbedirectory = 1;
467			break;
468		case 'f':	/* "from" */
469			iamremote = 1;
470			fflag = 1;
471			break;
472		case 't':	/* "to" */
473			iamremote = 1;
474			tflag = 1;
475#ifdef HAVE_CYGWIN
476			setmode(0, O_BINARY);
477#endif
478			break;
479		default:
480			usage();
481		}
482	argc -= optind;
483	argv += optind;
484
485	if ((pwd = getpwuid(userid = getuid())) == NULL)
486		fatal("unknown user %u", (u_int) userid);
487
488	if (!isatty(STDOUT_FILENO))
489		showprogress = 0;
490
491	if (pflag) {
492		/* Cannot pledge: -p allows setuid/setgid files... */
493	} else {
494		if (pledge("stdio rpath wpath cpath fattr tty proc exec",
495		    NULL) == -1) {
496			perror("pledge");
497			exit(1);
498		}
499	}
500
501	remin = STDIN_FILENO;
502	remout = STDOUT_FILENO;
503
504	if (fflag) {
505		/* Follow "protocol", send data. */
506		(void) response();
507		source(argc, argv);
508		exit(errs != 0);
509	}
510	if (tflag) {
511		/* Receive data. */
512		sink(argc, argv);
513		exit(errs != 0);
514	}
515	if (argc < 2)
516		usage();
517	if (argc > 2)
518		targetshouldbedirectory = 1;
519
520	remin = remout = -1;
521	do_cmd_pid = -1;
522	/* Command to be executed on remote system using "ssh". */
523	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
524	    verbose_mode ? " -v" : "",
525	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
526	    targetshouldbedirectory ? " -d" : "");
527
528	(void) signal(SIGPIPE, lostconn);
529
530	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
531		toremote(targ, argc, argv);
532	else {
533		if (targetshouldbedirectory)
534			verifydir(argv[argc - 1]);
535		tolocal(argc, argv);	/* Dest is local host. */
536	}
537	/*
538	 * Finally check the exit status of the ssh process, if one was forked
539	 * and no error has occurred yet
540	 */
541	if (do_cmd_pid != -1 && errs == 0) {
542		if (remin != -1)
543		    (void) close(remin);
544		if (remout != -1)
545		    (void) close(remout);
546		if (waitpid(do_cmd_pid, &status, 0) == -1)
547			errs = 1;
548		else {
549			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
550				errs = 1;
551		}
552	}
553	exit(errs != 0);
554}
555
556/* Callback from atomicio6 to update progress meter and limit bandwidth */
557static int
558scpio(void *_cnt, size_t s)
559{
560	off_t *cnt = (off_t *)_cnt;
561
562	*cnt += s;
563	if (limit_kbps > 0)
564		bandwidth_limit(&bwlimit, s);
565	return 0;
566}
567
568static int
569do_times(int fd, int verb, const struct stat *sb)
570{
571	/* strlen(2^64) == 20; strlen(10^6) == 7 */
572	char buf[(20 + 7 + 2) * 2 + 2];
573
574	(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
575	    (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
576	    (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
577	if (verb) {
578		fprintf(stderr, "File mtime %lld atime %lld\n",
579		    (long long)sb->st_mtime, (long long)sb->st_atime);
580		fprintf(stderr, "Sending file timestamps: %s", buf);
581	}
582	(void) atomicio(vwrite, fd, buf, strlen(buf));
583	return (response());
584}
585
586void
587toremote(char *targ, int argc, char **argv)
588{
589	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
590	arglist alist;
591	int i;
592	u_int j;
593
594	memset(&alist, '\0', sizeof(alist));
595	alist.list = NULL;
596
597	*targ++ = 0;
598	if (*targ == 0)
599		targ = ".";
600
601	arg = xstrdup(argv[argc - 1]);
602	if ((thost = strrchr(arg, '@'))) {
603		/* user@host */
604		*thost++ = 0;
605		tuser = arg;
606		if (*tuser == '\0')
607			tuser = NULL;
608	} else {
609		thost = arg;
610		tuser = NULL;
611	}
612
613	if (tuser != NULL && !okname(tuser)) {
614		free(arg);
615		return;
616	}
617
618	for (i = 0; i < argc - 1; i++) {
619		src = colon(argv[i]);
620		if (src && throughlocal) {	/* extended remote to remote */
621			*src++ = 0;
622			if (*src == 0)
623				src = ".";
624			host = strrchr(argv[i], '@');
625			if (host) {
626				*host++ = 0;
627				host = cleanhostname(host);
628				suser = argv[i];
629				if (*suser == '\0')
630					suser = pwd->pw_name;
631				else if (!okname(suser))
632					continue;
633			} else {
634				host = cleanhostname(argv[i]);
635				suser = NULL;
636			}
637			xasprintf(&bp, "%s -f %s%s", cmd,
638			    *src == '-' ? "-- " : "", src);
639			if (do_cmd(host, suser, bp, &remin, &remout) < 0)
640				exit(1);
641			free(bp);
642			host = cleanhostname(thost);
643			xasprintf(&bp, "%s -t %s%s", cmd,
644			    *targ == '-' ? "-- " : "", targ);
645			if (do_cmd2(host, tuser, bp, remin, remout) < 0)
646				exit(1);
647			free(bp);
648			(void) close(remin);
649			(void) close(remout);
650			remin = remout = -1;
651		} else if (src) {	/* standard remote to remote */
652			freeargs(&alist);
653			addargs(&alist, "%s", ssh_program);
654			addargs(&alist, "-x");
655			addargs(&alist, "-oClearAllForwardings=yes");
656			addargs(&alist, "-n");
657			for (j = 0; j < remote_remote_args.num; j++) {
658				addargs(&alist, "%s",
659				    remote_remote_args.list[j]);
660			}
661			*src++ = 0;
662			if (*src == 0)
663				src = ".";
664			host = strrchr(argv[i], '@');
665
666			if (host) {
667				*host++ = 0;
668				host = cleanhostname(host);
669				suser = argv[i];
670				if (*suser == '\0')
671					suser = pwd->pw_name;
672				else if (!okname(suser))
673					continue;
674				addargs(&alist, "-l");
675				addargs(&alist, "%s", suser);
676			} else {
677				host = cleanhostname(argv[i]);
678			}
679			addargs(&alist, "--");
680			addargs(&alist, "%s", host);
681			addargs(&alist, "%s", cmd);
682			addargs(&alist, "%s", src);
683			addargs(&alist, "%s%s%s:%s",
684			    tuser ? tuser : "", tuser ? "@" : "",
685			    thost, targ);
686			if (do_local_cmd(&alist) != 0)
687				errs = 1;
688		} else {	/* local to remote */
689			if (remin == -1) {
690				xasprintf(&bp, "%s -t %s%s", cmd,
691				    *targ == '-' ? "-- " : "", targ);
692				host = cleanhostname(thost);
693				if (do_cmd(host, tuser, bp, &remin,
694				    &remout) < 0)
695					exit(1);
696				if (response() < 0)
697					exit(1);
698				free(bp);
699			}
700			source(1, argv + i);
701		}
702	}
703	free(arg);
704}
705
706void
707tolocal(int argc, char **argv)
708{
709	char *bp, *host, *src, *suser;
710	arglist alist;
711	int i;
712
713	memset(&alist, '\0', sizeof(alist));
714	alist.list = NULL;
715
716	for (i = 0; i < argc - 1; i++) {
717		if (!(src = colon(argv[i]))) {	/* Local to local. */
718			freeargs(&alist);
719			addargs(&alist, "%s", _PATH_CP);
720			if (iamrecursive)
721				addargs(&alist, "-r");
722			if (pflag)
723				addargs(&alist, "-p");
724			addargs(&alist, "--");
725			addargs(&alist, "%s", argv[i]);
726			addargs(&alist, "%s", argv[argc-1]);
727			if (do_local_cmd(&alist))
728				++errs;
729			continue;
730		}
731		*src++ = 0;
732		if (*src == 0)
733			src = ".";
734		if ((host = strrchr(argv[i], '@')) == NULL) {
735			host = argv[i];
736			suser = NULL;
737		} else {
738			*host++ = 0;
739			suser = argv[i];
740			if (*suser == '\0')
741				suser = pwd->pw_name;
742		}
743		host = cleanhostname(host);
744		xasprintf(&bp, "%s -f %s%s",
745		    cmd, *src == '-' ? "-- " : "", src);
746		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
747			free(bp);
748			++errs;
749			continue;
750		}
751		free(bp);
752		sink(1, argv + argc - 1);
753		(void) close(remin);
754		remin = remout = -1;
755	}
756}
757
758void
759source(int argc, char **argv)
760{
761	struct stat stb;
762	static BUF buffer;
763	BUF *bp;
764	off_t i, statbytes;
765	size_t amt, nr;
766	int fd = -1, haderr, indx;
767	char *last, *name, buf[2048], encname[PATH_MAX];
768	int len;
769
770	for (indx = 0; indx < argc; ++indx) {
771		name = argv[indx];
772		statbytes = 0;
773		len = strlen(name);
774		while (len > 1 && name[len-1] == '/')
775			name[--len] = '\0';
776		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
777			goto syserr;
778		if (strchr(name, '\n') != NULL) {
779			strnvis(encname, name, sizeof(encname), VIS_NL);
780			name = encname;
781		}
782		if (fstat(fd, &stb) < 0) {
783syserr:			run_err("%s: %s", name, strerror(errno));
784			goto next;
785		}
786		if (stb.st_size < 0) {
787			run_err("%s: %s", name, "Negative file size");
788			goto next;
789		}
790		unset_nonblock(fd);
791		switch (stb.st_mode & S_IFMT) {
792		case S_IFREG:
793			break;
794		case S_IFDIR:
795			if (iamrecursive) {
796				rsource(name, &stb);
797				goto next;
798			}
799			/* FALLTHROUGH */
800		default:
801			run_err("%s: not a regular file", name);
802			goto next;
803		}
804		if ((last = strrchr(name, '/')) == NULL)
805			last = name;
806		else
807			++last;
808		curfile = last;
809		if (pflag) {
810			if (do_times(remout, verbose_mode, &stb) < 0)
811				goto next;
812		}
813#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
814		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
815		    (u_int) (stb.st_mode & FILEMODEMASK),
816		    (long long)stb.st_size, last);
817		if (verbose_mode)
818			fmprintf(stderr, "Sending file modes: %s", buf);
819		(void) atomicio(vwrite, remout, buf, strlen(buf));
820		if (response() < 0)
821			goto next;
822		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
823next:			if (fd != -1) {
824				(void) close(fd);
825				fd = -1;
826			}
827			continue;
828		}
829		if (showprogress)
830			start_progress_meter(curfile, stb.st_size, &statbytes);
831		set_nonblock(remout);
832		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
833			amt = bp->cnt;
834			if (i + (off_t)amt > stb.st_size)
835				amt = stb.st_size - i;
836			if (!haderr) {
837				if ((nr = atomicio(read, fd,
838				    bp->buf, amt)) != amt) {
839					haderr = errno;
840					memset(bp->buf + nr, 0, amt - nr);
841				}
842			}
843			/* Keep writing after error to retain sync */
844			if (haderr) {
845				(void)atomicio(vwrite, remout, bp->buf, amt);
846				memset(bp->buf, 0, amt);
847				continue;
848			}
849			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
850			    &statbytes) != amt)
851				haderr = errno;
852		}
853		unset_nonblock(remout);
854
855		if (fd != -1) {
856			if (close(fd) < 0 && !haderr)
857				haderr = errno;
858			fd = -1;
859		}
860		if (!haderr)
861			(void) atomicio(vwrite, remout, "", 1);
862		else
863			run_err("%s: %s", name, strerror(haderr));
864		(void) response();
865		if (showprogress)
866			stop_progress_meter();
867	}
868}
869
870void
871rsource(char *name, struct stat *statp)
872{
873	DIR *dirp;
874	struct dirent *dp;
875	char *last, *vect[1], path[PATH_MAX];
876
877	if (!(dirp = opendir(name))) {
878		run_err("%s: %s", name, strerror(errno));
879		return;
880	}
881	last = strrchr(name, '/');
882	if (last == NULL)
883		last = name;
884	else
885		last++;
886	if (pflag) {
887		if (do_times(remout, verbose_mode, statp) < 0) {
888			closedir(dirp);
889			return;
890		}
891	}
892	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
893	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
894	if (verbose_mode)
895		fmprintf(stderr, "Entering directory: %s", path);
896	(void) atomicio(vwrite, remout, path, strlen(path));
897	if (response() < 0) {
898		closedir(dirp);
899		return;
900	}
901	while ((dp = readdir(dirp)) != NULL) {
902		if (dp->d_ino == 0)
903			continue;
904		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
905			continue;
906		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
907			run_err("%s/%s: name too long", name, dp->d_name);
908			continue;
909		}
910		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
911		vect[0] = path;
912		source(1, vect);
913	}
914	(void) closedir(dirp);
915	(void) atomicio(vwrite, remout, "E\n", 2);
916	(void) response();
917}
918
919void
920sink(int argc, char **argv)
921{
922	static BUF buffer;
923	struct stat stb;
924	enum {
925		YES, NO, DISPLAYED
926	} wrerr;
927	BUF *bp;
928	off_t i;
929	size_t j, count;
930	int amt, exists, first, ofd;
931	mode_t mode, omode, mask;
932	off_t size, statbytes;
933	unsigned long long ull;
934	int setimes, targisdir, wrerrno = 0;
935	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
936	struct timeval tv[2];
937
938#define	atime	tv[0]
939#define	mtime	tv[1]
940#define	SCREWUP(str)	{ why = str; goto screwup; }
941
942	setimes = targisdir = 0;
943	mask = umask(0);
944	if (!pflag)
945		(void) umask(mask);
946	if (argc != 1) {
947		run_err("ambiguous target");
948		exit(1);
949	}
950	targ = *argv;
951	if (targetshouldbedirectory)
952		verifydir(targ);
953
954	(void) atomicio(vwrite, remout, "", 1);
955	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
956		targisdir = 1;
957	for (first = 1;; first = 0) {
958		cp = buf;
959		if (atomicio(read, remin, cp, 1) != 1)
960			return;
961		if (*cp++ == '\n')
962			SCREWUP("unexpected <newline>");
963		do {
964			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
965				SCREWUP("lost connection");
966			*cp++ = ch;
967		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
968		*cp = 0;
969		if (verbose_mode)
970			fmprintf(stderr, "Sink: %s", buf);
971
972		if (buf[0] == '\01' || buf[0] == '\02') {
973			if (iamremote == 0) {
974				(void) snmprintf(visbuf, sizeof(visbuf),
975				    NULL, "%s", buf + 1);
976				(void) atomicio(vwrite, STDERR_FILENO,
977				    visbuf, strlen(visbuf));
978			}
979			if (buf[0] == '\02')
980				exit(1);
981			++errs;
982			continue;
983		}
984		if (buf[0] == 'E') {
985			(void) atomicio(vwrite, remout, "", 1);
986			return;
987		}
988		if (ch == '\n')
989			*--cp = 0;
990
991		cp = buf;
992		if (*cp == 'T') {
993			setimes++;
994			cp++;
995			if (!isdigit((unsigned char)*cp))
996				SCREWUP("mtime.sec not present");
997			ull = strtoull(cp, &cp, 10);
998			if (!cp || *cp++ != ' ')
999				SCREWUP("mtime.sec not delimited");
1000			if ((time_t)ull < 0 ||
1001			    (unsigned long long)(time_t)ull != ull)
1002				setimes = 0;	/* out of range */
1003			mtime.tv_sec = ull;
1004			mtime.tv_usec = strtol(cp, &cp, 10);
1005			if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
1006			    mtime.tv_usec > 999999)
1007				SCREWUP("mtime.usec not delimited");
1008			if (!isdigit((unsigned char)*cp))
1009				SCREWUP("atime.sec not present");
1010			ull = strtoull(cp, &cp, 10);
1011			if (!cp || *cp++ != ' ')
1012				SCREWUP("atime.sec not delimited");
1013			if ((time_t)ull < 0 ||
1014			    (unsigned long long)(time_t)ull != ull)
1015				setimes = 0;	/* out of range */
1016			atime.tv_sec = ull;
1017			atime.tv_usec = strtol(cp, &cp, 10);
1018			if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1019			    atime.tv_usec > 999999)
1020				SCREWUP("atime.usec not delimited");
1021			(void) atomicio(vwrite, remout, "", 1);
1022			continue;
1023		}
1024		if (*cp != 'C' && *cp != 'D') {
1025			/*
1026			 * Check for the case "rcp remote:foo\* local:bar".
1027			 * In this case, the line "No match." can be returned
1028			 * by the shell before the rcp command on the remote is
1029			 * executed so the ^Aerror_message convention isn't
1030			 * followed.
1031			 */
1032			if (first) {
1033				run_err("%s", cp);
1034				exit(1);
1035			}
1036			SCREWUP("expected control record");
1037		}
1038		mode = 0;
1039		for (++cp; cp < buf + 5; cp++) {
1040			if (*cp < '0' || *cp > '7')
1041				SCREWUP("bad mode");
1042			mode = (mode << 3) | (*cp - '0');
1043		}
1044		if (*cp++ != ' ')
1045			SCREWUP("mode not delimited");
1046
1047		for (size = 0; isdigit((unsigned char)*cp);)
1048			size = size * 10 + (*cp++ - '0');
1049		if (*cp++ != ' ')
1050			SCREWUP("size not delimited");
1051		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1052			run_err("error: unexpected filename: %s", cp);
1053			exit(1);
1054		}
1055		if (targisdir) {
1056			static char *namebuf;
1057			static size_t cursize;
1058			size_t need;
1059
1060			need = strlen(targ) + strlen(cp) + 250;
1061			if (need > cursize) {
1062				free(namebuf);
1063				namebuf = xmalloc(need);
1064				cursize = need;
1065			}
1066			(void) snprintf(namebuf, need, "%s%s%s", targ,
1067			    strcmp(targ, "/") ? "/" : "", cp);
1068			np = namebuf;
1069		} else
1070			np = targ;
1071		curfile = cp;
1072		exists = stat(np, &stb) == 0;
1073		if (buf[0] == 'D') {
1074			int mod_flag = pflag;
1075			if (!iamrecursive)
1076				SCREWUP("received directory without -r");
1077			if (exists) {
1078				if (!S_ISDIR(stb.st_mode)) {
1079					errno = ENOTDIR;
1080					goto bad;
1081				}
1082				if (pflag)
1083					(void) chmod(np, mode);
1084			} else {
1085				/* Handle copying from a read-only
1086				   directory */
1087				mod_flag = 1;
1088				if (mkdir(np, mode | S_IRWXU) < 0)
1089					goto bad;
1090			}
1091			vect[0] = xstrdup(np);
1092			sink(1, vect);
1093			if (setimes) {
1094				setimes = 0;
1095				if (utimes(vect[0], tv) < 0)
1096					run_err("%s: set times: %s",
1097					    vect[0], strerror(errno));
1098			}
1099			if (mod_flag)
1100				(void) chmod(vect[0], mode);
1101			free(vect[0]);
1102			continue;
1103		}
1104		omode = mode;
1105		mode |= S_IWUSR;
1106		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1107bad:			run_err("%s: %s", np, strerror(errno));
1108			continue;
1109		}
1110		(void) atomicio(vwrite, remout, "", 1);
1111		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1112			(void) close(ofd);
1113			continue;
1114		}
1115		cp = bp->buf;
1116		wrerr = NO;
1117
1118		statbytes = 0;
1119		if (showprogress)
1120			start_progress_meter(curfile, size, &statbytes);
1121		set_nonblock(remin);
1122		for (count = i = 0; i < size; i += bp->cnt) {
1123			amt = bp->cnt;
1124			if (i + amt > size)
1125				amt = size - i;
1126			count += amt;
1127			do {
1128				j = atomicio6(read, remin, cp, amt,
1129				    scpio, &statbytes);
1130				if (j == 0) {
1131					run_err("%s", j != EPIPE ?
1132					    strerror(errno) :
1133					    "dropped connection");
1134					exit(1);
1135				}
1136				amt -= j;
1137				cp += j;
1138			} while (amt > 0);
1139
1140			if (count == bp->cnt) {
1141				/* Keep reading so we stay sync'd up. */
1142				if (wrerr == NO) {
1143					if (atomicio(vwrite, ofd, bp->buf,
1144					    count) != count) {
1145						wrerr = YES;
1146						wrerrno = errno;
1147					}
1148				}
1149				count = 0;
1150				cp = bp->buf;
1151			}
1152		}
1153		unset_nonblock(remin);
1154		if (count != 0 && wrerr == NO &&
1155		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1156			wrerr = YES;
1157			wrerrno = errno;
1158		}
1159		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1160		    ftruncate(ofd, size) != 0) {
1161			run_err("%s: truncate: %s", np, strerror(errno));
1162			wrerr = DISPLAYED;
1163		}
1164		if (pflag) {
1165			if (exists || omode != mode)
1166#ifdef HAVE_FCHMOD
1167				if (fchmod(ofd, omode)) {
1168#else /* HAVE_FCHMOD */
1169				if (chmod(np, omode)) {
1170#endif /* HAVE_FCHMOD */
1171					run_err("%s: set mode: %s",
1172					    np, strerror(errno));
1173					wrerr = DISPLAYED;
1174				}
1175		} else {
1176			if (!exists && omode != mode)
1177#ifdef HAVE_FCHMOD
1178				if (fchmod(ofd, omode & ~mask)) {
1179#else /* HAVE_FCHMOD */
1180				if (chmod(np, omode & ~mask)) {
1181#endif /* HAVE_FCHMOD */
1182					run_err("%s: set mode: %s",
1183					    np, strerror(errno));
1184					wrerr = DISPLAYED;
1185				}
1186		}
1187		if (close(ofd) == -1) {
1188			wrerr = YES;
1189			wrerrno = errno;
1190		}
1191		(void) response();
1192		if (showprogress)
1193			stop_progress_meter();
1194		if (setimes && wrerr == NO) {
1195			setimes = 0;
1196			if (utimes(np, tv) < 0) {
1197				run_err("%s: set times: %s",
1198				    np, strerror(errno));
1199				wrerr = DISPLAYED;
1200			}
1201		}
1202		switch (wrerr) {
1203		case YES:
1204			run_err("%s: %s", np, strerror(wrerrno));
1205			break;
1206		case NO:
1207			(void) atomicio(vwrite, remout, "", 1);
1208			break;
1209		case DISPLAYED:
1210			break;
1211		}
1212	}
1213screwup:
1214	run_err("protocol error: %s", why);
1215	exit(1);
1216}
1217
1218int
1219response(void)
1220{
1221	char ch, *cp, resp, rbuf[2048], visbuf[2048];
1222
1223	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1224		lostconn(0);
1225
1226	cp = rbuf;
1227	switch (resp) {
1228	case 0:		/* ok */
1229		return (0);
1230	default:
1231		*cp++ = resp;
1232		/* FALLTHROUGH */
1233	case 1:		/* error, followed by error msg */
1234	case 2:		/* fatal error, "" */
1235		do {
1236			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1237				lostconn(0);
1238			*cp++ = ch;
1239		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1240
1241		if (!iamremote) {
1242			cp[-1] = '\0';
1243			(void) snmprintf(visbuf, sizeof(visbuf),
1244			    NULL, "%s\n", rbuf);
1245			(void) atomicio(vwrite, STDERR_FILENO,
1246			    visbuf, strlen(visbuf));
1247		}
1248		++errs;
1249		if (resp == 1)
1250			return (-1);
1251		exit(1);
1252	}
1253	/* NOTREACHED */
1254}
1255
1256void
1257usage(void)
1258{
1259	(void) fprintf(stderr,
1260	    "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1261	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1262	    "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1263	exit(1);
1264}
1265
1266void
1267run_err(const char *fmt,...)
1268{
1269	static FILE *fp;
1270	va_list ap;
1271
1272	++errs;
1273	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1274		(void) fprintf(fp, "%c", 0x01);
1275		(void) fprintf(fp, "scp: ");
1276		va_start(ap, fmt);
1277		(void) vfprintf(fp, fmt, ap);
1278		va_end(ap);
1279		(void) fprintf(fp, "\n");
1280		(void) fflush(fp);
1281	}
1282
1283	if (!iamremote) {
1284		va_start(ap, fmt);
1285		vfmprintf(stderr, fmt, ap);
1286		va_end(ap);
1287		fprintf(stderr, "\n");
1288	}
1289}
1290
1291void
1292verifydir(char *cp)
1293{
1294	struct stat stb;
1295
1296	if (!stat(cp, &stb)) {
1297		if (S_ISDIR(stb.st_mode))
1298			return;
1299		errno = ENOTDIR;
1300	}
1301	run_err("%s: %s", cp, strerror(errno));
1302	killchild(0);
1303}
1304
1305int
1306okname(char *cp0)
1307{
1308	int c;
1309	char *cp;
1310
1311	cp = cp0;
1312	do {
1313		c = (int)*cp;
1314		if (c & 0200)
1315			goto bad;
1316		if (!isalpha(c) && !isdigit((unsigned char)c)) {
1317			switch (c) {
1318			case '\'':
1319			case '"':
1320			case '`':
1321			case ' ':
1322			case '#':
1323				goto bad;
1324			default:
1325				break;
1326			}
1327		}
1328	} while (*++cp);
1329	return (1);
1330
1331bad:	fmprintf(stderr, "%s: invalid user name\n", cp0);
1332	return (0);
1333}
1334
1335BUF *
1336allocbuf(BUF *bp, int fd, int blksize)
1337{
1338	size_t size;
1339#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1340	struct stat stb;
1341
1342	if (fstat(fd, &stb) < 0) {
1343		run_err("fstat: %s", strerror(errno));
1344		return (0);
1345	}
1346	size = roundup(stb.st_blksize, blksize);
1347	if (size == 0)
1348		size = blksize;
1349#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1350	size = blksize;
1351#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1352	if (bp->cnt >= size)
1353		return (bp);
1354	if (bp->buf == NULL)
1355		bp->buf = xmalloc(size);
1356	else
1357		bp->buf = xreallocarray(bp->buf, 1, size);
1358	memset(bp->buf, 0, size);
1359	bp->cnt = size;
1360	return (bp);
1361}
1362
1363void
1364lostconn(int signo)
1365{
1366	if (!iamremote)
1367		(void)write(STDERR_FILENO, "lost connection\n", 16);
1368	if (signo)
1369		_exit(1);
1370	else
1371		exit(1);
1372}
1373