scp.c revision 295367 
1/* $OpenBSD: scp.c,v 1.182 2015/04/24 01:36:00 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 <limits.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
118extern char *__progname;
119
120#define COPY_BUFLEN	16384
121
122int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
123int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
124
125/* Struct for addargs */
126arglist args;
127arglist remote_remote_args;
128
129/* Bandwidth limit */
130long long limit_kbps = 0;
131struct bwlimit bwlimit;
132
133/* Name of current file being transferred. */
134char *curfile;
135
136/* This is set to non-zero to enable verbose mode. */
137int verbose_mode = 0;
138
139/* This is set to zero if the progressmeter is not desired. */
140int showprogress = 1;
141
142/*
143 * This is set to non-zero if remote-remote copy should be piped
144 * through this process.
145 */
146int throughlocal = 0;
147
148/* This is the program to execute for the secured connection. ("ssh" or -S) */
149char *ssh_program = _PATH_SSH_PROGRAM;
150
151/* This is used to store the pid of ssh_program */
152pid_t do_cmd_pid = -1;
153
154static void
155killchild(int signo)
156{
157	if (do_cmd_pid > 1) {
158		kill(do_cmd_pid, signo ? signo : SIGTERM);
159		waitpid(do_cmd_pid, NULL, 0);
160	}
161
162	if (signo)
163		_exit(1);
164	exit(1);
165}
166
167static void
168suspchild(int signo)
169{
170	int status;
171
172	if (do_cmd_pid > 1) {
173		kill(do_cmd_pid, signo);
174		while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
175		    errno == EINTR)
176			;
177		kill(getpid(), SIGSTOP);
178	}
179}
180
181static int
182do_local_cmd(arglist *a)
183{
184	u_int i;
185	int status;
186	pid_t pid;
187
188	if (a->num == 0)
189		fatal("do_local_cmd: no arguments");
190
191	if (verbose_mode) {
192		fprintf(stderr, "Executing:");
193		for (i = 0; i < a->num; i++)
194			fprintf(stderr, " %s", a->list[i]);
195		fprintf(stderr, "\n");
196	}
197	if ((pid = fork()) == -1)
198		fatal("do_local_cmd: fork: %s", strerror(errno));
199
200	if (pid == 0) {
201		execvp(a->list[0], a->list);
202		perror(a->list[0]);
203		exit(1);
204	}
205
206	do_cmd_pid = pid;
207	signal(SIGTERM, killchild);
208	signal(SIGINT, killchild);
209	signal(SIGHUP, killchild);
210
211	while (waitpid(pid, &status, 0) == -1)
212		if (errno != EINTR)
213			fatal("do_local_cmd: waitpid: %s", strerror(errno));
214
215	do_cmd_pid = -1;
216
217	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
218		return (-1);
219
220	return (0);
221}
222
223/*
224 * This function executes the given command as the specified user on the
225 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
226 * assigns the input and output file descriptors on success.
227 */
228
229int
230do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
231{
232	int pin[2], pout[2], reserved[2];
233
234	if (verbose_mode)
235		fprintf(stderr,
236		    "Executing: program %s host %s, user %s, command %s\n",
237		    ssh_program, host,
238		    remuser ? remuser : "(unspecified)", cmd);
239
240	/*
241	 * Reserve two descriptors so that the real pipes won't get
242	 * descriptors 0 and 1 because that will screw up dup2 below.
243	 */
244	if (pipe(reserved) < 0)
245		fatal("pipe: %s", strerror(errno));
246
247	/* Create a socket pair for communicating with ssh. */
248	if (pipe(pin) < 0)
249		fatal("pipe: %s", strerror(errno));
250	if (pipe(pout) < 0)
251		fatal("pipe: %s", strerror(errno));
252
253	/* Free the reserved descriptors. */
254	close(reserved[0]);
255	close(reserved[1]);
256
257	signal(SIGTSTP, suspchild);
258	signal(SIGTTIN, suspchild);
259	signal(SIGTTOU, suspchild);
260
261	/* Fork a child to execute the command on the remote host using ssh. */
262	do_cmd_pid = fork();
263	if (do_cmd_pid == 0) {
264		/* Child. */
265		close(pin[1]);
266		close(pout[0]);
267		dup2(pin[0], 0);
268		dup2(pout[1], 1);
269		close(pin[0]);
270		close(pout[1]);
271
272		replacearg(&args, 0, "%s", ssh_program);
273		if (remuser != NULL) {
274			addargs(&args, "-l");
275			addargs(&args, "%s", remuser);
276		}
277		addargs(&args, "--");
278		addargs(&args, "%s", host);
279		addargs(&args, "%s", cmd);
280
281		execvp(ssh_program, args.list);
282		perror(ssh_program);
283		exit(1);
284	} else if (do_cmd_pid == -1) {
285		fatal("fork: %s", strerror(errno));
286	}
287	/* Parent.  Close the other side, and return the local side. */
288	close(pin[0]);
289	*fdout = pin[1];
290	close(pout[1]);
291	*fdin = pout[0];
292	signal(SIGTERM, killchild);
293	signal(SIGINT, killchild);
294	signal(SIGHUP, killchild);
295	return 0;
296}
297
298/*
299 * This functions executes a command simlar to do_cmd(), but expects the
300 * input and output descriptors to be setup by a previous call to do_cmd().
301 * This way the input and output of two commands can be connected.
302 */
303int
304do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
305{
306	pid_t pid;
307	int status;
308
309	if (verbose_mode)
310		fprintf(stderr,
311		    "Executing: 2nd program %s host %s, user %s, command %s\n",
312		    ssh_program, host,
313		    remuser ? remuser : "(unspecified)", cmd);
314
315	/* Fork a child to execute the command on the remote host using ssh. */
316	pid = fork();
317	if (pid == 0) {
318		dup2(fdin, 0);
319		dup2(fdout, 1);
320
321		replacearg(&args, 0, "%s", ssh_program);
322		if (remuser != NULL) {
323			addargs(&args, "-l");
324			addargs(&args, "%s", remuser);
325		}
326		addargs(&args, "--");
327		addargs(&args, "%s", host);
328		addargs(&args, "%s", cmd);
329
330		execvp(ssh_program, args.list);
331		perror(ssh_program);
332		exit(1);
333	} else if (pid == -1) {
334		fatal("fork: %s", strerror(errno));
335	}
336	while (waitpid(pid, &status, 0) == -1)
337		if (errno != EINTR)
338			fatal("do_cmd2: waitpid: %s", strerror(errno));
339	return 0;
340}
341
342typedef struct {
343	size_t cnt;
344	char *buf;
345} BUF;
346
347BUF *allocbuf(BUF *, int, int);
348void lostconn(int);
349int okname(char *);
350void run_err(const char *,...);
351void verifydir(char *);
352
353struct passwd *pwd;
354uid_t userid;
355int errs, remin, remout;
356int pflag, iamremote, iamrecursive, targetshouldbedirectory;
357
358#define	CMDNEEDS	64
359char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
360
361int response(void);
362void rsource(char *, struct stat *);
363void sink(int, char *[]);
364void source(int, char *[]);
365void tolocal(int, char *[]);
366void toremote(char *, int, char *[]);
367void usage(void);
368
369int
370main(int argc, char **argv)
371{
372	int ch, fflag, tflag, status, n;
373	char *targ, **newargv;
374	const char *errstr;
375	extern char *optarg;
376	extern int optind;
377
378	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
379	sanitise_stdfd();
380
381	/* Copy argv, because we modify it */
382	newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
383	for (n = 0; n < argc; n++)
384		newargv[n] = xstrdup(argv[n]);
385	argv = newargv;
386
387	__progname = ssh_get_progname(argv[0]);
388
389	memset(&args, '\0', sizeof(args));
390	memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
391	args.list = remote_remote_args.list = NULL;
392	addargs(&args, "%s", ssh_program);
393	addargs(&args, "-x");
394	addargs(&args, "-oForwardAgent=no");
395	addargs(&args, "-oPermitLocalCommand=no");
396	addargs(&args, "-oClearAllForwardings=yes");
397
398	fflag = tflag = 0;
399	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
400		switch (ch) {
401		/* User-visible flags. */
402		case '1':
403		case '2':
404		case '4':
405		case '6':
406		case 'C':
407			addargs(&args, "-%c", ch);
408			addargs(&remote_remote_args, "-%c", ch);
409			break;
410		case '3':
411			throughlocal = 1;
412			break;
413		case 'o':
414		case 'c':
415		case 'i':
416		case 'F':
417			addargs(&remote_remote_args, "-%c", ch);
418			addargs(&remote_remote_args, "%s", optarg);
419			addargs(&args, "-%c", ch);
420			addargs(&args, "%s", optarg);
421			break;
422		case 'P':
423			addargs(&remote_remote_args, "-p");
424			addargs(&remote_remote_args, "%s", optarg);
425			addargs(&args, "-p");
426			addargs(&args, "%s", optarg);
427			break;
428		case 'B':
429			addargs(&remote_remote_args, "-oBatchmode=yes");
430			addargs(&args, "-oBatchmode=yes");
431			break;
432		case 'l':
433			limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
434			    &errstr);
435			if (errstr != NULL)
436				usage();
437			limit_kbps *= 1024; /* kbps */
438			bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
439			break;
440		case 'p':
441			pflag = 1;
442			break;
443		case 'r':
444			iamrecursive = 1;
445			break;
446		case 'S':
447			ssh_program = xstrdup(optarg);
448			break;
449		case 'v':
450			addargs(&args, "-v");
451			addargs(&remote_remote_args, "-v");
452			verbose_mode = 1;
453			break;
454		case 'q':
455			addargs(&args, "-q");
456			addargs(&remote_remote_args, "-q");
457			showprogress = 0;
458			break;
459
460		/* Server options. */
461		case 'd':
462			targetshouldbedirectory = 1;
463			break;
464		case 'f':	/* "from" */
465			iamremote = 1;
466			fflag = 1;
467			break;
468		case 't':	/* "to" */
469			iamremote = 1;
470			tflag = 1;
471#ifdef HAVE_CYGWIN
472			setmode(0, O_BINARY);
473#endif
474			break;
475		default:
476			usage();
477		}
478	argc -= optind;
479	argv += optind;
480
481	if ((pwd = getpwuid(userid = getuid())) == NULL)
482		fatal("unknown user %u", (u_int) userid);
483
484	if (!isatty(STDOUT_FILENO))
485		showprogress = 0;
486
487	remin = STDIN_FILENO;
488	remout = STDOUT_FILENO;
489
490	if (fflag) {
491		/* Follow "protocol", send data. */
492		(void) response();
493		source(argc, argv);
494		exit(errs != 0);
495	}
496	if (tflag) {
497		/* Receive data. */
498		sink(argc, argv);
499		exit(errs != 0);
500	}
501	if (argc < 2)
502		usage();
503	if (argc > 2)
504		targetshouldbedirectory = 1;
505
506	remin = remout = -1;
507	do_cmd_pid = -1;
508	/* Command to be executed on remote system using "ssh". */
509	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
510	    verbose_mode ? " -v" : "",
511	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
512	    targetshouldbedirectory ? " -d" : "");
513
514	(void) signal(SIGPIPE, lostconn);
515
516	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
517		toremote(targ, argc, argv);
518	else {
519		if (targetshouldbedirectory)
520			verifydir(argv[argc - 1]);
521		tolocal(argc, argv);	/* Dest is local host. */
522	}
523	/*
524	 * Finally check the exit status of the ssh process, if one was forked
525	 * and no error has occurred yet
526	 */
527	if (do_cmd_pid != -1 && errs == 0) {
528		if (remin != -1)
529		    (void) close(remin);
530		if (remout != -1)
531		    (void) close(remout);
532		if (waitpid(do_cmd_pid, &status, 0) == -1)
533			errs = 1;
534		else {
535			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
536				errs = 1;
537		}
538	}
539	exit(errs != 0);
540}
541
542/* Callback from atomicio6 to update progress meter and limit bandwidth */
543static int
544scpio(void *_cnt, size_t s)
545{
546	off_t *cnt = (off_t *)_cnt;
547
548	*cnt += s;
549	if (limit_kbps > 0)
550		bandwidth_limit(&bwlimit, s);
551	return 0;
552}
553
554static int
555do_times(int fd, int verb, const struct stat *sb)
556{
557	/* strlen(2^64) == 20; strlen(10^6) == 7 */
558	char buf[(20 + 7 + 2) * 2 + 2];
559
560	(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
561	    (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
562	    (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
563	if (verb) {
564		fprintf(stderr, "File mtime %lld atime %lld\n",
565		    (long long)sb->st_mtime, (long long)sb->st_atime);
566		fprintf(stderr, "Sending file timestamps: %s", buf);
567	}
568	(void) atomicio(vwrite, fd, buf, strlen(buf));
569	return (response());
570}
571
572void
573toremote(char *targ, int argc, char **argv)
574{
575	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
576	arglist alist;
577	int i;
578	u_int j;
579
580	memset(&alist, '\0', sizeof(alist));
581	alist.list = NULL;
582
583	*targ++ = 0;
584	if (*targ == 0)
585		targ = ".";
586
587	arg = xstrdup(argv[argc - 1]);
588	if ((thost = strrchr(arg, '@'))) {
589		/* user@host */
590		*thost++ = 0;
591		tuser = arg;
592		if (*tuser == '\0')
593			tuser = NULL;
594	} else {
595		thost = arg;
596		tuser = NULL;
597	}
598
599	if (tuser != NULL && !okname(tuser)) {
600		free(arg);
601		return;
602	}
603
604	for (i = 0; i < argc - 1; i++) {
605		src = colon(argv[i]);
606		if (src && throughlocal) {	/* extended remote to remote */
607			*src++ = 0;
608			if (*src == 0)
609				src = ".";
610			host = strrchr(argv[i], '@');
611			if (host) {
612				*host++ = 0;
613				host = cleanhostname(host);
614				suser = argv[i];
615				if (*suser == '\0')
616					suser = pwd->pw_name;
617				else if (!okname(suser))
618					continue;
619			} else {
620				host = cleanhostname(argv[i]);
621				suser = NULL;
622			}
623			xasprintf(&bp, "%s -f %s%s", cmd,
624			    *src == '-' ? "-- " : "", src);
625			if (do_cmd(host, suser, bp, &remin, &remout) < 0)
626				exit(1);
627			free(bp);
628			host = cleanhostname(thost);
629			xasprintf(&bp, "%s -t %s%s", cmd,
630			    *targ == '-' ? "-- " : "", targ);
631			if (do_cmd2(host, tuser, bp, remin, remout) < 0)
632				exit(1);
633			free(bp);
634			(void) close(remin);
635			(void) close(remout);
636			remin = remout = -1;
637		} else if (src) {	/* standard remote to remote */
638			freeargs(&alist);
639			addargs(&alist, "%s", ssh_program);
640			addargs(&alist, "-x");
641			addargs(&alist, "-oClearAllForwardings=yes");
642			addargs(&alist, "-n");
643			for (j = 0; j < remote_remote_args.num; j++) {
644				addargs(&alist, "%s",
645				    remote_remote_args.list[j]);
646			}
647			*src++ = 0;
648			if (*src == 0)
649				src = ".";
650			host = strrchr(argv[i], '@');
651
652			if (host) {
653				*host++ = 0;
654				host = cleanhostname(host);
655				suser = argv[i];
656				if (*suser == '\0')
657					suser = pwd->pw_name;
658				else if (!okname(suser))
659					continue;
660				addargs(&alist, "-l");
661				addargs(&alist, "%s", suser);
662			} else {
663				host = cleanhostname(argv[i]);
664			}
665			addargs(&alist, "--");
666			addargs(&alist, "%s", host);
667			addargs(&alist, "%s", cmd);
668			addargs(&alist, "%s", src);
669			addargs(&alist, "%s%s%s:%s",
670			    tuser ? tuser : "", tuser ? "@" : "",
671			    thost, targ);
672			if (do_local_cmd(&alist) != 0)
673				errs = 1;
674		} else {	/* local to remote */
675			if (remin == -1) {
676				xasprintf(&bp, "%s -t %s%s", cmd,
677				    *targ == '-' ? "-- " : "", targ);
678				host = cleanhostname(thost);
679				if (do_cmd(host, tuser, bp, &remin,
680				    &remout) < 0)
681					exit(1);
682				if (response() < 0)
683					exit(1);
684				free(bp);
685			}
686			source(1, argv + i);
687		}
688	}
689	free(arg);
690}
691
692void
693tolocal(int argc, char **argv)
694{
695	char *bp, *host, *src, *suser;
696	arglist alist;
697	int i;
698
699	memset(&alist, '\0', sizeof(alist));
700	alist.list = NULL;
701
702	for (i = 0; i < argc - 1; i++) {
703		if (!(src = colon(argv[i]))) {	/* Local to local. */
704			freeargs(&alist);
705			addargs(&alist, "%s", _PATH_CP);
706			if (iamrecursive)
707				addargs(&alist, "-r");
708			if (pflag)
709				addargs(&alist, "-p");
710			addargs(&alist, "--");
711			addargs(&alist, "%s", argv[i]);
712			addargs(&alist, "%s", argv[argc-1]);
713			if (do_local_cmd(&alist))
714				++errs;
715			continue;
716		}
717		*src++ = 0;
718		if (*src == 0)
719			src = ".";
720		if ((host = strrchr(argv[i], '@')) == NULL) {
721			host = argv[i];
722			suser = NULL;
723		} else {
724			*host++ = 0;
725			suser = argv[i];
726			if (*suser == '\0')
727				suser = pwd->pw_name;
728		}
729		host = cleanhostname(host);
730		xasprintf(&bp, "%s -f %s%s",
731		    cmd, *src == '-' ? "-- " : "", src);
732		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
733			free(bp);
734			++errs;
735			continue;
736		}
737		free(bp);
738		sink(1, argv + argc - 1);
739		(void) close(remin);
740		remin = remout = -1;
741	}
742}
743
744void
745source(int argc, char **argv)
746{
747	struct stat stb;
748	static BUF buffer;
749	BUF *bp;
750	off_t i, statbytes;
751	size_t amt, nr;
752	int fd = -1, haderr, indx;
753	char *last, *name, buf[2048], encname[PATH_MAX];
754	int len;
755
756	for (indx = 0; indx < argc; ++indx) {
757		name = argv[indx];
758		statbytes = 0;
759		len = strlen(name);
760		while (len > 1 && name[len-1] == '/')
761			name[--len] = '\0';
762		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
763			goto syserr;
764		if (strchr(name, '\n') != NULL) {
765			strnvis(encname, name, sizeof(encname), VIS_NL);
766			name = encname;
767		}
768		if (fstat(fd, &stb) < 0) {
769syserr:			run_err("%s: %s", name, strerror(errno));
770			goto next;
771		}
772		if (stb.st_size < 0) {
773			run_err("%s: %s", name, "Negative file size");
774			goto next;
775		}
776		unset_nonblock(fd);
777		switch (stb.st_mode & S_IFMT) {
778		case S_IFREG:
779			break;
780		case S_IFDIR:
781			if (iamrecursive) {
782				rsource(name, &stb);
783				goto next;
784			}
785			/* FALLTHROUGH */
786		default:
787			run_err("%s: not a regular file", name);
788			goto next;
789		}
790		if ((last = strrchr(name, '/')) == NULL)
791			last = name;
792		else
793			++last;
794		curfile = last;
795		if (pflag) {
796			if (do_times(remout, verbose_mode, &stb) < 0)
797				goto next;
798		}
799#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
800		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
801		    (u_int) (stb.st_mode & FILEMODEMASK),
802		    (long long)stb.st_size, last);
803		if (verbose_mode) {
804			fprintf(stderr, "Sending file modes: %s", buf);
805		}
806		(void) atomicio(vwrite, remout, buf, strlen(buf));
807		if (response() < 0)
808			goto next;
809		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
810next:			if (fd != -1) {
811				(void) close(fd);
812				fd = -1;
813			}
814			continue;
815		}
816		if (showprogress)
817			start_progress_meter(curfile, stb.st_size, &statbytes);
818		set_nonblock(remout);
819		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
820			amt = bp->cnt;
821			if (i + (off_t)amt > stb.st_size)
822				amt = stb.st_size - i;
823			if (!haderr) {
824				if ((nr = atomicio(read, fd,
825				    bp->buf, amt)) != amt) {
826					haderr = errno;
827					memset(bp->buf + nr, 0, amt - nr);
828				}
829			}
830			/* Keep writing after error to retain sync */
831			if (haderr) {
832				(void)atomicio(vwrite, remout, bp->buf, amt);
833				memset(bp->buf, 0, amt);
834				continue;
835			}
836			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
837			    &statbytes) != amt)
838				haderr = errno;
839		}
840		unset_nonblock(remout);
841		if (showprogress)
842			stop_progress_meter();
843
844		if (fd != -1) {
845			if (close(fd) < 0 && !haderr)
846				haderr = errno;
847			fd = -1;
848		}
849		if (!haderr)
850			(void) atomicio(vwrite, remout, "", 1);
851		else
852			run_err("%s: %s", name, strerror(haderr));
853		(void) response();
854	}
855}
856
857void
858rsource(char *name, struct stat *statp)
859{
860	DIR *dirp;
861	struct dirent *dp;
862	char *last, *vect[1], path[PATH_MAX];
863
864	if (!(dirp = opendir(name))) {
865		run_err("%s: %s", name, strerror(errno));
866		return;
867	}
868	last = strrchr(name, '/');
869	if (last == 0)
870		last = name;
871	else
872		last++;
873	if (pflag) {
874		if (do_times(remout, verbose_mode, statp) < 0) {
875			closedir(dirp);
876			return;
877		}
878	}
879	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
880	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
881	if (verbose_mode)
882		fprintf(stderr, "Entering directory: %s", path);
883	(void) atomicio(vwrite, remout, path, strlen(path));
884	if (response() < 0) {
885		closedir(dirp);
886		return;
887	}
888	while ((dp = readdir(dirp)) != NULL) {
889		if (dp->d_ino == 0)
890			continue;
891		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
892			continue;
893		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
894			run_err("%s/%s: name too long", name, dp->d_name);
895			continue;
896		}
897		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
898		vect[0] = path;
899		source(1, vect);
900	}
901	(void) closedir(dirp);
902	(void) atomicio(vwrite, remout, "E\n", 2);
903	(void) response();
904}
905
906void
907sink(int argc, char **argv)
908{
909	static BUF buffer;
910	struct stat stb;
911	enum {
912		YES, NO, DISPLAYED
913	} wrerr;
914	BUF *bp;
915	off_t i;
916	size_t j, count;
917	int amt, exists, first, ofd;
918	mode_t mode, omode, mask;
919	off_t size, statbytes;
920	unsigned long long ull;
921	int setimes, targisdir, wrerrno = 0;
922	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
923	struct timeval tv[2];
924
925#define	atime	tv[0]
926#define	mtime	tv[1]
927#define	SCREWUP(str)	{ why = str; goto screwup; }
928
929	setimes = targisdir = 0;
930	mask = umask(0);
931	if (!pflag)
932		(void) umask(mask);
933	if (argc != 1) {
934		run_err("ambiguous target");
935		exit(1);
936	}
937	targ = *argv;
938	if (targetshouldbedirectory)
939		verifydir(targ);
940
941	(void) atomicio(vwrite, remout, "", 1);
942	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
943		targisdir = 1;
944	for (first = 1;; first = 0) {
945		cp = buf;
946		if (atomicio(read, remin, cp, 1) != 1)
947			return;
948		if (*cp++ == '\n')
949			SCREWUP("unexpected <newline>");
950		do {
951			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
952				SCREWUP("lost connection");
953			*cp++ = ch;
954		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
955		*cp = 0;
956		if (verbose_mode)
957			fprintf(stderr, "Sink: %s", buf);
958
959		if (buf[0] == '\01' || buf[0] == '\02') {
960			if (iamremote == 0)
961				(void) atomicio(vwrite, STDERR_FILENO,
962				    buf + 1, strlen(buf + 1));
963			if (buf[0] == '\02')
964				exit(1);
965			++errs;
966			continue;
967		}
968		if (buf[0] == 'E') {
969			(void) atomicio(vwrite, remout, "", 1);
970			return;
971		}
972		if (ch == '\n')
973			*--cp = 0;
974
975		cp = buf;
976		if (*cp == 'T') {
977			setimes++;
978			cp++;
979			if (!isdigit((unsigned char)*cp))
980				SCREWUP("mtime.sec not present");
981			ull = strtoull(cp, &cp, 10);
982			if (!cp || *cp++ != ' ')
983				SCREWUP("mtime.sec not delimited");
984			if ((time_t)ull < 0 ||
985			    (unsigned long long)(time_t)ull != ull)
986				setimes = 0;	/* out of range */
987			mtime.tv_sec = ull;
988			mtime.tv_usec = strtol(cp, &cp, 10);
989			if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
990			    mtime.tv_usec > 999999)
991				SCREWUP("mtime.usec not delimited");
992			if (!isdigit((unsigned char)*cp))
993				SCREWUP("atime.sec not present");
994			ull = strtoull(cp, &cp, 10);
995			if (!cp || *cp++ != ' ')
996				SCREWUP("atime.sec not delimited");
997			if ((time_t)ull < 0 ||
998			    (unsigned long long)(time_t)ull != ull)
999				setimes = 0;	/* out of range */
1000			atime.tv_sec = ull;
1001			atime.tv_usec = strtol(cp, &cp, 10);
1002			if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1003			    atime.tv_usec > 999999)
1004				SCREWUP("atime.usec not delimited");
1005			(void) atomicio(vwrite, remout, "", 1);
1006			continue;
1007		}
1008		if (*cp != 'C' && *cp != 'D') {
1009			/*
1010			 * Check for the case "rcp remote:foo\* local:bar".
1011			 * In this case, the line "No match." can be returned
1012			 * by the shell before the rcp command on the remote is
1013			 * executed so the ^Aerror_message convention isn't
1014			 * followed.
1015			 */
1016			if (first) {
1017				run_err("%s", cp);
1018				exit(1);
1019			}
1020			SCREWUP("expected control record");
1021		}
1022		mode = 0;
1023		for (++cp; cp < buf + 5; cp++) {
1024			if (*cp < '0' || *cp > '7')
1025				SCREWUP("bad mode");
1026			mode = (mode << 3) | (*cp - '0');
1027		}
1028		if (*cp++ != ' ')
1029			SCREWUP("mode not delimited");
1030
1031		for (size = 0; isdigit((unsigned char)*cp);)
1032			size = size * 10 + (*cp++ - '0');
1033		if (*cp++ != ' ')
1034			SCREWUP("size not delimited");
1035		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1036			run_err("error: unexpected filename: %s", cp);
1037			exit(1);
1038		}
1039		if (targisdir) {
1040			static char *namebuf;
1041			static size_t cursize;
1042			size_t need;
1043
1044			need = strlen(targ) + strlen(cp) + 250;
1045			if (need > cursize) {
1046				free(namebuf);
1047				namebuf = xmalloc(need);
1048				cursize = need;
1049			}
1050			(void) snprintf(namebuf, need, "%s%s%s", targ,
1051			    strcmp(targ, "/") ? "/" : "", cp);
1052			np = namebuf;
1053		} else
1054			np = targ;
1055		curfile = cp;
1056		exists = stat(np, &stb) == 0;
1057		if (buf[0] == 'D') {
1058			int mod_flag = pflag;
1059			if (!iamrecursive)
1060				SCREWUP("received directory without -r");
1061			if (exists) {
1062				if (!S_ISDIR(stb.st_mode)) {
1063					errno = ENOTDIR;
1064					goto bad;
1065				}
1066				if (pflag)
1067					(void) chmod(np, mode);
1068			} else {
1069				/* Handle copying from a read-only
1070				   directory */
1071				mod_flag = 1;
1072				if (mkdir(np, mode | S_IRWXU) < 0)
1073					goto bad;
1074			}
1075			vect[0] = xstrdup(np);
1076			sink(1, vect);
1077			if (setimes) {
1078				setimes = 0;
1079				if (utimes(vect[0], tv) < 0)
1080					run_err("%s: set times: %s",
1081					    vect[0], strerror(errno));
1082			}
1083			if (mod_flag)
1084				(void) chmod(vect[0], mode);
1085			free(vect[0]);
1086			continue;
1087		}
1088		omode = mode;
1089		mode |= S_IWUSR;
1090		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1091bad:			run_err("%s: %s", np, strerror(errno));
1092			continue;
1093		}
1094		(void) atomicio(vwrite, remout, "", 1);
1095		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1096			(void) close(ofd);
1097			continue;
1098		}
1099		cp = bp->buf;
1100		wrerr = NO;
1101
1102		statbytes = 0;
1103		if (showprogress)
1104			start_progress_meter(curfile, size, &statbytes);
1105		set_nonblock(remin);
1106		for (count = i = 0; i < size; i += bp->cnt) {
1107			amt = bp->cnt;
1108			if (i + amt > size)
1109				amt = size - i;
1110			count += amt;
1111			do {
1112				j = atomicio6(read, remin, cp, amt,
1113				    scpio, &statbytes);
1114				if (j == 0) {
1115					run_err("%s", j != EPIPE ?
1116					    strerror(errno) :
1117					    "dropped connection");
1118					exit(1);
1119				}
1120				amt -= j;
1121				cp += j;
1122			} while (amt > 0);
1123
1124			if (count == bp->cnt) {
1125				/* Keep reading so we stay sync'd up. */
1126				if (wrerr == NO) {
1127					if (atomicio(vwrite, ofd, bp->buf,
1128					    count) != count) {
1129						wrerr = YES;
1130						wrerrno = errno;
1131					}
1132				}
1133				count = 0;
1134				cp = bp->buf;
1135			}
1136		}
1137		unset_nonblock(remin);
1138		if (showprogress)
1139			stop_progress_meter();
1140		if (count != 0 && wrerr == NO &&
1141		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1142			wrerr = YES;
1143			wrerrno = errno;
1144		}
1145		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1146		    ftruncate(ofd, size) != 0) {
1147			run_err("%s: truncate: %s", np, strerror(errno));
1148			wrerr = DISPLAYED;
1149		}
1150		if (pflag) {
1151			if (exists || omode != mode)
1152#ifdef HAVE_FCHMOD
1153				if (fchmod(ofd, omode)) {
1154#else /* HAVE_FCHMOD */
1155				if (chmod(np, omode)) {
1156#endif /* HAVE_FCHMOD */
1157					run_err("%s: set mode: %s",
1158					    np, strerror(errno));
1159					wrerr = DISPLAYED;
1160				}
1161		} else {
1162			if (!exists && omode != mode)
1163#ifdef HAVE_FCHMOD
1164				if (fchmod(ofd, omode & ~mask)) {
1165#else /* HAVE_FCHMOD */
1166				if (chmod(np, omode & ~mask)) {
1167#endif /* HAVE_FCHMOD */
1168					run_err("%s: set mode: %s",
1169					    np, strerror(errno));
1170					wrerr = DISPLAYED;
1171				}
1172		}
1173		if (close(ofd) == -1) {
1174			wrerr = YES;
1175			wrerrno = errno;
1176		}
1177		(void) response();
1178		if (setimes && wrerr == NO) {
1179			setimes = 0;
1180			if (utimes(np, tv) < 0) {
1181				run_err("%s: set times: %s",
1182				    np, strerror(errno));
1183				wrerr = DISPLAYED;
1184			}
1185		}
1186		switch (wrerr) {
1187		case YES:
1188			run_err("%s: %s", np, strerror(wrerrno));
1189			break;
1190		case NO:
1191			(void) atomicio(vwrite, remout, "", 1);
1192			break;
1193		case DISPLAYED:
1194			break;
1195		}
1196	}
1197screwup:
1198	run_err("protocol error: %s", why);
1199	exit(1);
1200}
1201
1202int
1203response(void)
1204{
1205	char ch, *cp, resp, rbuf[2048];
1206
1207	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1208		lostconn(0);
1209
1210	cp = rbuf;
1211	switch (resp) {
1212	case 0:		/* ok */
1213		return (0);
1214	default:
1215		*cp++ = resp;
1216		/* FALLTHROUGH */
1217	case 1:		/* error, followed by error msg */
1218	case 2:		/* fatal error, "" */
1219		do {
1220			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1221				lostconn(0);
1222			*cp++ = ch;
1223		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1224
1225		if (!iamremote)
1226			(void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1227		++errs;
1228		if (resp == 1)
1229			return (-1);
1230		exit(1);
1231	}
1232	/* NOTREACHED */
1233}
1234
1235void
1236usage(void)
1237{
1238	(void) fprintf(stderr,
1239	    "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1240	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1241	    "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1242	exit(1);
1243}
1244
1245void
1246run_err(const char *fmt,...)
1247{
1248	static FILE *fp;
1249	va_list ap;
1250
1251	++errs;
1252	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1253		(void) fprintf(fp, "%c", 0x01);
1254		(void) fprintf(fp, "scp: ");
1255		va_start(ap, fmt);
1256		(void) vfprintf(fp, fmt, ap);
1257		va_end(ap);
1258		(void) fprintf(fp, "\n");
1259		(void) fflush(fp);
1260	}
1261
1262	if (!iamremote) {
1263		va_start(ap, fmt);
1264		vfprintf(stderr, fmt, ap);
1265		va_end(ap);
1266		fprintf(stderr, "\n");
1267	}
1268}
1269
1270void
1271verifydir(char *cp)
1272{
1273	struct stat stb;
1274
1275	if (!stat(cp, &stb)) {
1276		if (S_ISDIR(stb.st_mode))
1277			return;
1278		errno = ENOTDIR;
1279	}
1280	run_err("%s: %s", cp, strerror(errno));
1281	killchild(0);
1282}
1283
1284int
1285okname(char *cp0)
1286{
1287	int c;
1288	char *cp;
1289
1290	cp = cp0;
1291	do {
1292		c = (int)*cp;
1293		if (c & 0200)
1294			goto bad;
1295		if (!isalpha(c) && !isdigit((unsigned char)c)) {
1296			switch (c) {
1297			case '\'':
1298			case '"':
1299			case '`':
1300			case ' ':
1301			case '#':
1302				goto bad;
1303			default:
1304				break;
1305			}
1306		}
1307	} while (*++cp);
1308	return (1);
1309
1310bad:	fprintf(stderr, "%s: invalid user name\n", cp0);
1311	return (0);
1312}
1313
1314BUF *
1315allocbuf(BUF *bp, int fd, int blksize)
1316{
1317	size_t size;
1318#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1319	struct stat stb;
1320
1321	if (fstat(fd, &stb) < 0) {
1322		run_err("fstat: %s", strerror(errno));
1323		return (0);
1324	}
1325	size = roundup(stb.st_blksize, blksize);
1326	if (size == 0)
1327		size = blksize;
1328#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1329	size = blksize;
1330#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1331	if (bp->cnt >= size)
1332		return (bp);
1333	if (bp->buf == NULL)
1334		bp->buf = xmalloc(size);
1335	else
1336		bp->buf = xreallocarray(bp->buf, 1, size);
1337	memset(bp->buf, 0, size);
1338	bp->cnt = size;
1339	return (bp);
1340}
1341
1342void
1343lostconn(int signo)
1344{
1345	if (!iamremote)
1346		(void)write(STDERR_FILENO, "lost connection\n", 16);
1347	if (signo)
1348		_exit(1);
1349	else
1350		exit(1);
1351}
1352