scp.c revision 296781 
1/* $OpenBSD: scp.c,v 1.184 2015/11/27 00:49:31 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	if (pflag) {
488		/* Cannot pledge: -p allows setuid/setgid files... */
489	} else {
490		if (pledge("stdio rpath wpath cpath fattr tty proc exec",
491		    NULL) == -1) {
492			perror("pledge");
493			exit(1);
494		}
495	}
496
497	remin = STDIN_FILENO;
498	remout = STDOUT_FILENO;
499
500	if (fflag) {
501		/* Follow "protocol", send data. */
502		(void) response();
503		source(argc, argv);
504		exit(errs != 0);
505	}
506	if (tflag) {
507		/* Receive data. */
508		sink(argc, argv);
509		exit(errs != 0);
510	}
511	if (argc < 2)
512		usage();
513	if (argc > 2)
514		targetshouldbedirectory = 1;
515
516	remin = remout = -1;
517	do_cmd_pid = -1;
518	/* Command to be executed on remote system using "ssh". */
519	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
520	    verbose_mode ? " -v" : "",
521	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
522	    targetshouldbedirectory ? " -d" : "");
523
524	(void) signal(SIGPIPE, lostconn);
525
526	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
527		toremote(targ, argc, argv);
528	else {
529		if (targetshouldbedirectory)
530			verifydir(argv[argc - 1]);
531		tolocal(argc, argv);	/* Dest is local host. */
532	}
533	/*
534	 * Finally check the exit status of the ssh process, if one was forked
535	 * and no error has occurred yet
536	 */
537	if (do_cmd_pid != -1 && errs == 0) {
538		if (remin != -1)
539		    (void) close(remin);
540		if (remout != -1)
541		    (void) close(remout);
542		if (waitpid(do_cmd_pid, &status, 0) == -1)
543			errs = 1;
544		else {
545			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
546				errs = 1;
547		}
548	}
549	exit(errs != 0);
550}
551
552/* Callback from atomicio6 to update progress meter and limit bandwidth */
553static int
554scpio(void *_cnt, size_t s)
555{
556	off_t *cnt = (off_t *)_cnt;
557
558	*cnt += s;
559	if (limit_kbps > 0)
560		bandwidth_limit(&bwlimit, s);
561	return 0;
562}
563
564static int
565do_times(int fd, int verb, const struct stat *sb)
566{
567	/* strlen(2^64) == 20; strlen(10^6) == 7 */
568	char buf[(20 + 7 + 2) * 2 + 2];
569
570	(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
571	    (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
572	    (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
573	if (verb) {
574		fprintf(stderr, "File mtime %lld atime %lld\n",
575		    (long long)sb->st_mtime, (long long)sb->st_atime);
576		fprintf(stderr, "Sending file timestamps: %s", buf);
577	}
578	(void) atomicio(vwrite, fd, buf, strlen(buf));
579	return (response());
580}
581
582void
583toremote(char *targ, int argc, char **argv)
584{
585	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
586	arglist alist;
587	int i;
588	u_int j;
589
590	memset(&alist, '\0', sizeof(alist));
591	alist.list = NULL;
592
593	*targ++ = 0;
594	if (*targ == 0)
595		targ = ".";
596
597	arg = xstrdup(argv[argc - 1]);
598	if ((thost = strrchr(arg, '@'))) {
599		/* user@host */
600		*thost++ = 0;
601		tuser = arg;
602		if (*tuser == '\0')
603			tuser = NULL;
604	} else {
605		thost = arg;
606		tuser = NULL;
607	}
608
609	if (tuser != NULL && !okname(tuser)) {
610		free(arg);
611		return;
612	}
613
614	for (i = 0; i < argc - 1; i++) {
615		src = colon(argv[i]);
616		if (src && throughlocal) {	/* extended remote to remote */
617			*src++ = 0;
618			if (*src == 0)
619				src = ".";
620			host = strrchr(argv[i], '@');
621			if (host) {
622				*host++ = 0;
623				host = cleanhostname(host);
624				suser = argv[i];
625				if (*suser == '\0')
626					suser = pwd->pw_name;
627				else if (!okname(suser))
628					continue;
629			} else {
630				host = cleanhostname(argv[i]);
631				suser = NULL;
632			}
633			xasprintf(&bp, "%s -f %s%s", cmd,
634			    *src == '-' ? "-- " : "", src);
635			if (do_cmd(host, suser, bp, &remin, &remout) < 0)
636				exit(1);
637			free(bp);
638			host = cleanhostname(thost);
639			xasprintf(&bp, "%s -t %s%s", cmd,
640			    *targ == '-' ? "-- " : "", targ);
641			if (do_cmd2(host, tuser, bp, remin, remout) < 0)
642				exit(1);
643			free(bp);
644			(void) close(remin);
645			(void) close(remout);
646			remin = remout = -1;
647		} else if (src) {	/* standard remote to remote */
648			freeargs(&alist);
649			addargs(&alist, "%s", ssh_program);
650			addargs(&alist, "-x");
651			addargs(&alist, "-oClearAllForwardings=yes");
652			addargs(&alist, "-n");
653			for (j = 0; j < remote_remote_args.num; j++) {
654				addargs(&alist, "%s",
655				    remote_remote_args.list[j]);
656			}
657			*src++ = 0;
658			if (*src == 0)
659				src = ".";
660			host = strrchr(argv[i], '@');
661
662			if (host) {
663				*host++ = 0;
664				host = cleanhostname(host);
665				suser = argv[i];
666				if (*suser == '\0')
667					suser = pwd->pw_name;
668				else if (!okname(suser))
669					continue;
670				addargs(&alist, "-l");
671				addargs(&alist, "%s", suser);
672			} else {
673				host = cleanhostname(argv[i]);
674			}
675			addargs(&alist, "--");
676			addargs(&alist, "%s", host);
677			addargs(&alist, "%s", cmd);
678			addargs(&alist, "%s", src);
679			addargs(&alist, "%s%s%s:%s",
680			    tuser ? tuser : "", tuser ? "@" : "",
681			    thost, targ);
682			if (do_local_cmd(&alist) != 0)
683				errs = 1;
684		} else {	/* local to remote */
685			if (remin == -1) {
686				xasprintf(&bp, "%s -t %s%s", cmd,
687				    *targ == '-' ? "-- " : "", targ);
688				host = cleanhostname(thost);
689				if (do_cmd(host, tuser, bp, &remin,
690				    &remout) < 0)
691					exit(1);
692				if (response() < 0)
693					exit(1);
694				free(bp);
695			}
696			source(1, argv + i);
697		}
698	}
699	free(arg);
700}
701
702void
703tolocal(int argc, char **argv)
704{
705	char *bp, *host, *src, *suser;
706	arglist alist;
707	int i;
708
709	memset(&alist, '\0', sizeof(alist));
710	alist.list = NULL;
711
712	for (i = 0; i < argc - 1; i++) {
713		if (!(src = colon(argv[i]))) {	/* Local to local. */
714			freeargs(&alist);
715			addargs(&alist, "%s", _PATH_CP);
716			if (iamrecursive)
717				addargs(&alist, "-r");
718			if (pflag)
719				addargs(&alist, "-p");
720			addargs(&alist, "--");
721			addargs(&alist, "%s", argv[i]);
722			addargs(&alist, "%s", argv[argc-1]);
723			if (do_local_cmd(&alist))
724				++errs;
725			continue;
726		}
727		*src++ = 0;
728		if (*src == 0)
729			src = ".";
730		if ((host = strrchr(argv[i], '@')) == NULL) {
731			host = argv[i];
732			suser = NULL;
733		} else {
734			*host++ = 0;
735			suser = argv[i];
736			if (*suser == '\0')
737				suser = pwd->pw_name;
738		}
739		host = cleanhostname(host);
740		xasprintf(&bp, "%s -f %s%s",
741		    cmd, *src == '-' ? "-- " : "", src);
742		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
743			free(bp);
744			++errs;
745			continue;
746		}
747		free(bp);
748		sink(1, argv + argc - 1);
749		(void) close(remin);
750		remin = remout = -1;
751	}
752}
753
754void
755source(int argc, char **argv)
756{
757	struct stat stb;
758	static BUF buffer;
759	BUF *bp;
760	off_t i, statbytes;
761	size_t amt, nr;
762	int fd = -1, haderr, indx;
763	char *last, *name, buf[2048], encname[PATH_MAX];
764	int len;
765
766	for (indx = 0; indx < argc; ++indx) {
767		name = argv[indx];
768		statbytes = 0;
769		len = strlen(name);
770		while (len > 1 && name[len-1] == '/')
771			name[--len] = '\0';
772		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
773			goto syserr;
774		if (strchr(name, '\n') != NULL) {
775			strnvis(encname, name, sizeof(encname), VIS_NL);
776			name = encname;
777		}
778		if (fstat(fd, &stb) < 0) {
779syserr:			run_err("%s: %s", name, strerror(errno));
780			goto next;
781		}
782		if (stb.st_size < 0) {
783			run_err("%s: %s", name, "Negative file size");
784			goto next;
785		}
786		unset_nonblock(fd);
787		switch (stb.st_mode & S_IFMT) {
788		case S_IFREG:
789			break;
790		case S_IFDIR:
791			if (iamrecursive) {
792				rsource(name, &stb);
793				goto next;
794			}
795			/* FALLTHROUGH */
796		default:
797			run_err("%s: not a regular file", name);
798			goto next;
799		}
800		if ((last = strrchr(name, '/')) == NULL)
801			last = name;
802		else
803			++last;
804		curfile = last;
805		if (pflag) {
806			if (do_times(remout, verbose_mode, &stb) < 0)
807				goto next;
808		}
809#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
810		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
811		    (u_int) (stb.st_mode & FILEMODEMASK),
812		    (long long)stb.st_size, last);
813		if (verbose_mode) {
814			fprintf(stderr, "Sending file modes: %s", buf);
815		}
816		(void) atomicio(vwrite, remout, buf, strlen(buf));
817		if (response() < 0)
818			goto next;
819		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
820next:			if (fd != -1) {
821				(void) close(fd);
822				fd = -1;
823			}
824			continue;
825		}
826		if (showprogress)
827			start_progress_meter(curfile, stb.st_size, &statbytes);
828		set_nonblock(remout);
829		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
830			amt = bp->cnt;
831			if (i + (off_t)amt > stb.st_size)
832				amt = stb.st_size - i;
833			if (!haderr) {
834				if ((nr = atomicio(read, fd,
835				    bp->buf, amt)) != amt) {
836					haderr = errno;
837					memset(bp->buf + nr, 0, amt - nr);
838				}
839			}
840			/* Keep writing after error to retain sync */
841			if (haderr) {
842				(void)atomicio(vwrite, remout, bp->buf, amt);
843				memset(bp->buf, 0, amt);
844				continue;
845			}
846			if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
847			    &statbytes) != amt)
848				haderr = errno;
849		}
850		unset_nonblock(remout);
851		if (showprogress)
852			stop_progress_meter();
853
854		if (fd != -1) {
855			if (close(fd) < 0 && !haderr)
856				haderr = errno;
857			fd = -1;
858		}
859		if (!haderr)
860			(void) atomicio(vwrite, remout, "", 1);
861		else
862			run_err("%s: %s", name, strerror(haderr));
863		(void) response();
864	}
865}
866
867void
868rsource(char *name, struct stat *statp)
869{
870	DIR *dirp;
871	struct dirent *dp;
872	char *last, *vect[1], path[PATH_MAX];
873
874	if (!(dirp = opendir(name))) {
875		run_err("%s: %s", name, strerror(errno));
876		return;
877	}
878	last = strrchr(name, '/');
879	if (last == NULL)
880		last = name;
881	else
882		last++;
883	if (pflag) {
884		if (do_times(remout, verbose_mode, statp) < 0) {
885			closedir(dirp);
886			return;
887		}
888	}
889	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
890	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
891	if (verbose_mode)
892		fprintf(stderr, "Entering directory: %s", path);
893	(void) atomicio(vwrite, remout, path, strlen(path));
894	if (response() < 0) {
895		closedir(dirp);
896		return;
897	}
898	while ((dp = readdir(dirp)) != NULL) {
899		if (dp->d_ino == 0)
900			continue;
901		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
902			continue;
903		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
904			run_err("%s/%s: name too long", name, dp->d_name);
905			continue;
906		}
907		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
908		vect[0] = path;
909		source(1, vect);
910	}
911	(void) closedir(dirp);
912	(void) atomicio(vwrite, remout, "E\n", 2);
913	(void) response();
914}
915
916void
917sink(int argc, char **argv)
918{
919	static BUF buffer;
920	struct stat stb;
921	enum {
922		YES, NO, DISPLAYED
923	} wrerr;
924	BUF *bp;
925	off_t i;
926	size_t j, count;
927	int amt, exists, first, ofd;
928	mode_t mode, omode, mask;
929	off_t size, statbytes;
930	unsigned long long ull;
931	int setimes, targisdir, wrerrno = 0;
932	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
933	struct timeval tv[2];
934
935#define	atime	tv[0]
936#define	mtime	tv[1]
937#define	SCREWUP(str)	{ why = str; goto screwup; }
938
939	setimes = targisdir = 0;
940	mask = umask(0);
941	if (!pflag)
942		(void) umask(mask);
943	if (argc != 1) {
944		run_err("ambiguous target");
945		exit(1);
946	}
947	targ = *argv;
948	if (targetshouldbedirectory)
949		verifydir(targ);
950
951	(void) atomicio(vwrite, remout, "", 1);
952	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
953		targisdir = 1;
954	for (first = 1;; first = 0) {
955		cp = buf;
956		if (atomicio(read, remin, cp, 1) != 1)
957			return;
958		if (*cp++ == '\n')
959			SCREWUP("unexpected <newline>");
960		do {
961			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
962				SCREWUP("lost connection");
963			*cp++ = ch;
964		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
965		*cp = 0;
966		if (verbose_mode)
967			fprintf(stderr, "Sink: %s", buf);
968
969		if (buf[0] == '\01' || buf[0] == '\02') {
970			if (iamremote == 0)
971				(void) atomicio(vwrite, STDERR_FILENO,
972				    buf + 1, strlen(buf + 1));
973			if (buf[0] == '\02')
974				exit(1);
975			++errs;
976			continue;
977		}
978		if (buf[0] == 'E') {
979			(void) atomicio(vwrite, remout, "", 1);
980			return;
981		}
982		if (ch == '\n')
983			*--cp = 0;
984
985		cp = buf;
986		if (*cp == 'T') {
987			setimes++;
988			cp++;
989			if (!isdigit((unsigned char)*cp))
990				SCREWUP("mtime.sec not present");
991			ull = strtoull(cp, &cp, 10);
992			if (!cp || *cp++ != ' ')
993				SCREWUP("mtime.sec not delimited");
994			if ((time_t)ull < 0 ||
995			    (unsigned long long)(time_t)ull != ull)
996				setimes = 0;	/* out of range */
997			mtime.tv_sec = ull;
998			mtime.tv_usec = strtol(cp, &cp, 10);
999			if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
1000			    mtime.tv_usec > 999999)
1001				SCREWUP("mtime.usec not delimited");
1002			if (!isdigit((unsigned char)*cp))
1003				SCREWUP("atime.sec not present");
1004			ull = strtoull(cp, &cp, 10);
1005			if (!cp || *cp++ != ' ')
1006				SCREWUP("atime.sec not delimited");
1007			if ((time_t)ull < 0 ||
1008			    (unsigned long long)(time_t)ull != ull)
1009				setimes = 0;	/* out of range */
1010			atime.tv_sec = ull;
1011			atime.tv_usec = strtol(cp, &cp, 10);
1012			if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1013			    atime.tv_usec > 999999)
1014				SCREWUP("atime.usec not delimited");
1015			(void) atomicio(vwrite, remout, "", 1);
1016			continue;
1017		}
1018		if (*cp != 'C' && *cp != 'D') {
1019			/*
1020			 * Check for the case "rcp remote:foo\* local:bar".
1021			 * In this case, the line "No match." can be returned
1022			 * by the shell before the rcp command on the remote is
1023			 * executed so the ^Aerror_message convention isn't
1024			 * followed.
1025			 */
1026			if (first) {
1027				run_err("%s", cp);
1028				exit(1);
1029			}
1030			SCREWUP("expected control record");
1031		}
1032		mode = 0;
1033		for (++cp; cp < buf + 5; cp++) {
1034			if (*cp < '0' || *cp > '7')
1035				SCREWUP("bad mode");
1036			mode = (mode << 3) | (*cp - '0');
1037		}
1038		if (*cp++ != ' ')
1039			SCREWUP("mode not delimited");
1040
1041		for (size = 0; isdigit((unsigned char)*cp);)
1042			size = size * 10 + (*cp++ - '0');
1043		if (*cp++ != ' ')
1044			SCREWUP("size not delimited");
1045		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1046			run_err("error: unexpected filename: %s", cp);
1047			exit(1);
1048		}
1049		if (targisdir) {
1050			static char *namebuf;
1051			static size_t cursize;
1052			size_t need;
1053
1054			need = strlen(targ) + strlen(cp) + 250;
1055			if (need > cursize) {
1056				free(namebuf);
1057				namebuf = xmalloc(need);
1058				cursize = need;
1059			}
1060			(void) snprintf(namebuf, need, "%s%s%s", targ,
1061			    strcmp(targ, "/") ? "/" : "", cp);
1062			np = namebuf;
1063		} else
1064			np = targ;
1065		curfile = cp;
1066		exists = stat(np, &stb) == 0;
1067		if (buf[0] == 'D') {
1068			int mod_flag = pflag;
1069			if (!iamrecursive)
1070				SCREWUP("received directory without -r");
1071			if (exists) {
1072				if (!S_ISDIR(stb.st_mode)) {
1073					errno = ENOTDIR;
1074					goto bad;
1075				}
1076				if (pflag)
1077					(void) chmod(np, mode);
1078			} else {
1079				/* Handle copying from a read-only
1080				   directory */
1081				mod_flag = 1;
1082				if (mkdir(np, mode | S_IRWXU) < 0)
1083					goto bad;
1084			}
1085			vect[0] = xstrdup(np);
1086			sink(1, vect);
1087			if (setimes) {
1088				setimes = 0;
1089				if (utimes(vect[0], tv) < 0)
1090					run_err("%s: set times: %s",
1091					    vect[0], strerror(errno));
1092			}
1093			if (mod_flag)
1094				(void) chmod(vect[0], mode);
1095			free(vect[0]);
1096			continue;
1097		}
1098		omode = mode;
1099		mode |= S_IWUSR;
1100		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1101bad:			run_err("%s: %s", np, strerror(errno));
1102			continue;
1103		}
1104		(void) atomicio(vwrite, remout, "", 1);
1105		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1106			(void) close(ofd);
1107			continue;
1108		}
1109		cp = bp->buf;
1110		wrerr = NO;
1111
1112		statbytes = 0;
1113		if (showprogress)
1114			start_progress_meter(curfile, size, &statbytes);
1115		set_nonblock(remin);
1116		for (count = i = 0; i < size; i += bp->cnt) {
1117			amt = bp->cnt;
1118			if (i + amt > size)
1119				amt = size - i;
1120			count += amt;
1121			do {
1122				j = atomicio6(read, remin, cp, amt,
1123				    scpio, &statbytes);
1124				if (j == 0) {
1125					run_err("%s", j != EPIPE ?
1126					    strerror(errno) :
1127					    "dropped connection");
1128					exit(1);
1129				}
1130				amt -= j;
1131				cp += j;
1132			} while (amt > 0);
1133
1134			if (count == bp->cnt) {
1135				/* Keep reading so we stay sync'd up. */
1136				if (wrerr == NO) {
1137					if (atomicio(vwrite, ofd, bp->buf,
1138					    count) != count) {
1139						wrerr = YES;
1140						wrerrno = errno;
1141					}
1142				}
1143				count = 0;
1144				cp = bp->buf;
1145			}
1146		}
1147		unset_nonblock(remin);
1148		if (showprogress)
1149			stop_progress_meter();
1150		if (count != 0 && wrerr == NO &&
1151		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1152			wrerr = YES;
1153			wrerrno = errno;
1154		}
1155		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1156		    ftruncate(ofd, size) != 0) {
1157			run_err("%s: truncate: %s", np, strerror(errno));
1158			wrerr = DISPLAYED;
1159		}
1160		if (pflag) {
1161			if (exists || omode != mode)
1162#ifdef HAVE_FCHMOD
1163				if (fchmod(ofd, omode)) {
1164#else /* HAVE_FCHMOD */
1165				if (chmod(np, omode)) {
1166#endif /* HAVE_FCHMOD */
1167					run_err("%s: set mode: %s",
1168					    np, strerror(errno));
1169					wrerr = DISPLAYED;
1170				}
1171		} else {
1172			if (!exists && omode != mode)
1173#ifdef HAVE_FCHMOD
1174				if (fchmod(ofd, omode & ~mask)) {
1175#else /* HAVE_FCHMOD */
1176				if (chmod(np, omode & ~mask)) {
1177#endif /* HAVE_FCHMOD */
1178					run_err("%s: set mode: %s",
1179					    np, strerror(errno));
1180					wrerr = DISPLAYED;
1181				}
1182		}
1183		if (close(ofd) == -1) {
1184			wrerr = YES;
1185			wrerrno = errno;
1186		}
1187		(void) response();
1188		if (setimes && wrerr == NO) {
1189			setimes = 0;
1190			if (utimes(np, tv) < 0) {
1191				run_err("%s: set times: %s",
1192				    np, strerror(errno));
1193				wrerr = DISPLAYED;
1194			}
1195		}
1196		switch (wrerr) {
1197		case YES:
1198			run_err("%s: %s", np, strerror(wrerrno));
1199			break;
1200		case NO:
1201			(void) atomicio(vwrite, remout, "", 1);
1202			break;
1203		case DISPLAYED:
1204			break;
1205		}
1206	}
1207screwup:
1208	run_err("protocol error: %s", why);
1209	exit(1);
1210}
1211
1212int
1213response(void)
1214{
1215	char ch, *cp, resp, rbuf[2048];
1216
1217	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1218		lostconn(0);
1219
1220	cp = rbuf;
1221	switch (resp) {
1222	case 0:		/* ok */
1223		return (0);
1224	default:
1225		*cp++ = resp;
1226		/* FALLTHROUGH */
1227	case 1:		/* error, followed by error msg */
1228	case 2:		/* fatal error, "" */
1229		do {
1230			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1231				lostconn(0);
1232			*cp++ = ch;
1233		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1234
1235		if (!iamremote)
1236			(void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1237		++errs;
1238		if (resp == 1)
1239			return (-1);
1240		exit(1);
1241	}
1242	/* NOTREACHED */
1243}
1244
1245void
1246usage(void)
1247{
1248	(void) fprintf(stderr,
1249	    "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1250	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1251	    "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1252	exit(1);
1253}
1254
1255void
1256run_err(const char *fmt,...)
1257{
1258	static FILE *fp;
1259	va_list ap;
1260
1261	++errs;
1262	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1263		(void) fprintf(fp, "%c", 0x01);
1264		(void) fprintf(fp, "scp: ");
1265		va_start(ap, fmt);
1266		(void) vfprintf(fp, fmt, ap);
1267		va_end(ap);
1268		(void) fprintf(fp, "\n");
1269		(void) fflush(fp);
1270	}
1271
1272	if (!iamremote) {
1273		va_start(ap, fmt);
1274		vfprintf(stderr, fmt, ap);
1275		va_end(ap);
1276		fprintf(stderr, "\n");
1277	}
1278}
1279
1280void
1281verifydir(char *cp)
1282{
1283	struct stat stb;
1284
1285	if (!stat(cp, &stb)) {
1286		if (S_ISDIR(stb.st_mode))
1287			return;
1288		errno = ENOTDIR;
1289	}
1290	run_err("%s: %s", cp, strerror(errno));
1291	killchild(0);
1292}
1293
1294int
1295okname(char *cp0)
1296{
1297	int c;
1298	char *cp;
1299
1300	cp = cp0;
1301	do {
1302		c = (int)*cp;
1303		if (c & 0200)
1304			goto bad;
1305		if (!isalpha(c) && !isdigit((unsigned char)c)) {
1306			switch (c) {
1307			case '\'':
1308			case '"':
1309			case '`':
1310			case ' ':
1311			case '#':
1312				goto bad;
1313			default:
1314				break;
1315			}
1316		}
1317	} while (*++cp);
1318	return (1);
1319
1320bad:	fprintf(stderr, "%s: invalid user name\n", cp0);
1321	return (0);
1322}
1323
1324BUF *
1325allocbuf(BUF *bp, int fd, int blksize)
1326{
1327	size_t size;
1328#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1329	struct stat stb;
1330
1331	if (fstat(fd, &stb) < 0) {
1332		run_err("fstat: %s", strerror(errno));
1333		return (0);
1334	}
1335	size = roundup(stb.st_blksize, blksize);
1336	if (size == 0)
1337		size = blksize;
1338#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1339	size = blksize;
1340#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1341	if (bp->cnt >= size)
1342		return (bp);
1343	if (bp->buf == NULL)
1344		bp->buf = xmalloc(size);
1345	else
1346		bp->buf = xreallocarray(bp->buf, 1, size);
1347	memset(bp->buf, 0, size);
1348	bp->cnt = size;
1349	return (bp);
1350}
1351
1352void
1353lostconn(int signo)
1354{
1355	if (!iamremote)
1356		(void)write(STDERR_FILENO, "lost connection\n", 16);
1357	if (signo)
1358		_exit(1);
1359	else
1360		exit(1);
1361}
1362