scp.c revision 181111 
1/* $OpenBSD: scp.c,v 1.163 2008/06/13 18:55:22 dtucker Exp $ */
2/*
3 * scp - secure remote copy.  This is basically patched BSD rcp which
4 * uses ssh to do the data transfer (instead of using rcmd).
5 *
6 * NOTE: This version should NOT be suid root.  (This uses ssh to
7 * do the transfer and ssh has the necessary privileges.)
8 *
9 * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
10 *
11 * As far as I am concerned, the code I have written for this software
12 * can be used freely for any purpose.  Any derived versions of this
13 * software must be clearly marked as such, and if the derived work is
14 * incompatible with the protocol description in the RFC file, it must be
15 * called by a name other than "ssh" or "Secure Shell".
16 */
17/*
18 * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
19 * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 *    notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 *    notice, this list of conditions and the following disclaimer in the
28 *    documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 */
41
42/*
43 * Parts from:
44 *
45 * Copyright (c) 1983, 1990, 1992, 1993, 1995
46 *	The Regents of the University of California.  All rights reserved.
47 *
48 * Redistribution and use in source and binary forms, with or without
49 * modification, are permitted provided that the following conditions
50 * are met:
51 * 1. Redistributions of source code must retain the above copyright
52 *    notice, this list of conditions and the following disclaimer.
53 * 2. Redistributions in binary form must reproduce the above copyright
54 *    notice, this list of conditions and the following disclaimer in the
55 *    documentation and/or other materials provided with the distribution.
56 * 3. Neither the name of the University nor the names of its contributors
57 *    may be used to endorse or promote products derived from this software
58 *    without specific prior written permission.
59 *
60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
63 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70 * SUCH DAMAGE.
71 *
72 */
73
74#include "includes.h"
75
76#include <sys/types.h>
77#include <sys/param.h>
78#ifdef HAVE_SYS_STAT_H
79# include <sys/stat.h>
80#endif
81#ifdef HAVE_POLL_H
82#include <poll.h>
83#else
84# ifdef HAVE_SYS_POLL_H
85#  include <sys/poll.h>
86# endif
87#endif
88#ifdef HAVE_SYS_TIME_H
89# include <sys/time.h>
90#endif
91#include <sys/wait.h>
92#include <sys/uio.h>
93
94#include <ctype.h>
95#include <dirent.h>
96#include <errno.h>
97#include <fcntl.h>
98#include <pwd.h>
99#include <signal.h>
100#include <stdarg.h>
101#include <stdio.h>
102#include <stdlib.h>
103#include <string.h>
104#include <time.h>
105#include <unistd.h>
106#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H)
107#include <vis.h>
108#endif
109
110#include "xmalloc.h"
111#include "atomicio.h"
112#include "pathnames.h"
113#include "log.h"
114#include "misc.h"
115#include "progressmeter.h"
116
117extern char *__progname;
118
119#define COPY_BUFLEN	16384
120
121int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
122
123void bwlimit(int);
124
125/* Struct for addargs */
126arglist args;
127
128/* Bandwidth limit */
129off_t limit_rate = 0;
130
131/* Name of current file being transferred. */
132char *curfile;
133
134/* This is set to non-zero to enable verbose mode. */
135int verbose_mode = 0;
136
137/* This is set to zero if the progressmeter is not desired. */
138int showprogress = 1;
139
140/* This is the program to execute for the secured connection. ("ssh" or -S) */
141char *ssh_program = _PATH_SSH_PROGRAM;
142
143/* This is used to store the pid of ssh_program */
144pid_t do_cmd_pid = -1;
145
146static void
147killchild(int signo)
148{
149	if (do_cmd_pid > 1) {
150		kill(do_cmd_pid, signo ? signo : SIGTERM);
151		waitpid(do_cmd_pid, NULL, 0);
152	}
153
154	if (signo)
155		_exit(1);
156	exit(1);
157}
158
159static int
160do_local_cmd(arglist *a)
161{
162	u_int i;
163	int status;
164	pid_t pid;
165
166	if (a->num == 0)
167		fatal("do_local_cmd: no arguments");
168
169	if (verbose_mode) {
170		fprintf(stderr, "Executing:");
171		for (i = 0; i < a->num; i++)
172			fprintf(stderr, " %s", a->list[i]);
173		fprintf(stderr, "\n");
174	}
175	if ((pid = fork()) == -1)
176		fatal("do_local_cmd: fork: %s", strerror(errno));
177
178	if (pid == 0) {
179		execvp(a->list[0], a->list);
180		perror(a->list[0]);
181		exit(1);
182	}
183
184	do_cmd_pid = pid;
185	signal(SIGTERM, killchild);
186	signal(SIGINT, killchild);
187	signal(SIGHUP, killchild);
188
189	while (waitpid(pid, &status, 0) == -1)
190		if (errno != EINTR)
191			fatal("do_local_cmd: waitpid: %s", strerror(errno));
192
193	do_cmd_pid = -1;
194
195	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
196		return (-1);
197
198	return (0);
199}
200
201/*
202 * This function executes the given command as the specified user on the
203 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
204 * assigns the input and output file descriptors on success.
205 */
206
207int
208do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
209{
210	int pin[2], pout[2], reserved[2];
211
212	if (verbose_mode)
213		fprintf(stderr,
214		    "Executing: program %s host %s, user %s, command %s\n",
215		    ssh_program, host,
216		    remuser ? remuser : "(unspecified)", cmd);
217
218	/*
219	 * Reserve two descriptors so that the real pipes won't get
220	 * descriptors 0 and 1 because that will screw up dup2 below.
221	 */
222	if (pipe(reserved) < 0)
223		fatal("pipe: %s", strerror(errno));
224
225	/* Create a socket pair for communicating with ssh. */
226	if (pipe(pin) < 0)
227		fatal("pipe: %s", strerror(errno));
228	if (pipe(pout) < 0)
229		fatal("pipe: %s", strerror(errno));
230
231	/* Free the reserved descriptors. */
232	close(reserved[0]);
233	close(reserved[1]);
234
235	/* Fork a child to execute the command on the remote host using ssh. */
236	do_cmd_pid = fork();
237	if (do_cmd_pid == 0) {
238		/* Child. */
239		close(pin[1]);
240		close(pout[0]);
241		dup2(pin[0], 0);
242		dup2(pout[1], 1);
243		close(pin[0]);
244		close(pout[1]);
245
246		replacearg(&args, 0, "%s", ssh_program);
247		if (remuser != NULL)
248			addargs(&args, "-l%s", remuser);
249		addargs(&args, "%s", host);
250		addargs(&args, "%s", cmd);
251
252		execvp(ssh_program, args.list);
253		perror(ssh_program);
254		exit(1);
255	} else if (do_cmd_pid == -1) {
256		fatal("fork: %s", strerror(errno));
257	}
258	/* Parent.  Close the other side, and return the local side. */
259	close(pin[0]);
260	*fdout = pin[1];
261	close(pout[1]);
262	*fdin = pout[0];
263	signal(SIGTERM, killchild);
264	signal(SIGINT, killchild);
265	signal(SIGHUP, killchild);
266	return 0;
267}
268
269typedef struct {
270	size_t cnt;
271	char *buf;
272} BUF;
273
274BUF *allocbuf(BUF *, int, int);
275void lostconn(int);
276int okname(char *);
277void run_err(const char *,...);
278void verifydir(char *);
279
280struct passwd *pwd;
281uid_t userid;
282int errs, remin, remout;
283int pflag, iamremote, iamrecursive, targetshouldbedirectory;
284
285#define	CMDNEEDS	64
286char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
287
288int response(void);
289void rsource(char *, struct stat *);
290void sink(int, char *[]);
291void source(int, char *[]);
292void tolocal(int, char *[]);
293void toremote(char *, int, char *[]);
294size_t scpio(ssize_t (*)(int, void *, size_t), int, void *, size_t, off_t *);
295void usage(void);
296
297int
298main(int argc, char **argv)
299{
300	int ch, fflag, tflag, status, n;
301	double speed;
302	char *targ, *endp, **newargv;
303	extern char *optarg;
304	extern int optind;
305
306	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
307	sanitise_stdfd();
308
309	/* Copy argv, because we modify it */
310	newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
311	for (n = 0; n < argc; n++)
312		newargv[n] = xstrdup(argv[n]);
313	argv = newargv;
314
315	__progname = ssh_get_progname(argv[0]);
316
317	memset(&args, '\0', sizeof(args));
318	args.list = NULL;
319	addargs(&args, "%s", ssh_program);
320	addargs(&args, "-x");
321	addargs(&args, "-oForwardAgent no");
322	addargs(&args, "-oPermitLocalCommand no");
323	addargs(&args, "-oClearAllForwardings yes");
324
325	fflag = tflag = 0;
326	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
327		switch (ch) {
328		/* User-visible flags. */
329		case '1':
330		case '2':
331		case '4':
332		case '6':
333		case 'C':
334			addargs(&args, "-%c", ch);
335			break;
336		case 'o':
337		case 'c':
338		case 'i':
339		case 'F':
340			addargs(&args, "-%c%s", ch, optarg);
341			break;
342		case 'P':
343			addargs(&args, "-p%s", optarg);
344			break;
345		case 'B':
346			addargs(&args, "-oBatchmode yes");
347			break;
348		case 'l':
349			speed = strtod(optarg, &endp);
350			if (speed <= 0 || *endp != '\0')
351				usage();
352			limit_rate = speed * 1024;
353			break;
354		case 'p':
355			pflag = 1;
356			break;
357		case 'r':
358			iamrecursive = 1;
359			break;
360		case 'S':
361			ssh_program = xstrdup(optarg);
362			break;
363		case 'v':
364			addargs(&args, "-v");
365			verbose_mode = 1;
366			break;
367		case 'q':
368			addargs(&args, "-q");
369			showprogress = 0;
370			break;
371
372		/* Server options. */
373		case 'd':
374			targetshouldbedirectory = 1;
375			break;
376		case 'f':	/* "from" */
377			iamremote = 1;
378			fflag = 1;
379			break;
380		case 't':	/* "to" */
381			iamremote = 1;
382			tflag = 1;
383#ifdef HAVE_CYGWIN
384			setmode(0, O_BINARY);
385#endif
386			break;
387		default:
388			usage();
389		}
390	argc -= optind;
391	argv += optind;
392
393	if ((pwd = getpwuid(userid = getuid())) == NULL)
394		fatal("unknown user %u", (u_int) userid);
395
396	if (!isatty(STDOUT_FILENO))
397		showprogress = 0;
398
399	remin = STDIN_FILENO;
400	remout = STDOUT_FILENO;
401
402	if (fflag) {
403		/* Follow "protocol", send data. */
404		(void) response();
405		source(argc, argv);
406		exit(errs != 0);
407	}
408	if (tflag) {
409		/* Receive data. */
410		sink(argc, argv);
411		exit(errs != 0);
412	}
413	if (argc < 2)
414		usage();
415	if (argc > 2)
416		targetshouldbedirectory = 1;
417
418	remin = remout = -1;
419	do_cmd_pid = -1;
420	/* Command to be executed on remote system using "ssh". */
421	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
422	    verbose_mode ? " -v" : "",
423	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
424	    targetshouldbedirectory ? " -d" : "");
425
426	(void) signal(SIGPIPE, lostconn);
427
428	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
429		toremote(targ, argc, argv);
430	else {
431		if (targetshouldbedirectory)
432			verifydir(argv[argc - 1]);
433		tolocal(argc, argv);	/* Dest is local host. */
434	}
435	/*
436	 * Finally check the exit status of the ssh process, if one was forked
437	 * and no error has occured yet
438	 */
439	if (do_cmd_pid != -1 && errs == 0) {
440		if (remin != -1)
441		    (void) close(remin);
442		if (remout != -1)
443		    (void) close(remout);
444		if (waitpid(do_cmd_pid, &status, 0) == -1)
445			errs = 1;
446		else {
447			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
448				errs = 1;
449		}
450	}
451	exit(errs != 0);
452}
453
454/*
455 * atomicio-like wrapper that also applies bandwidth limits and updates
456 * the progressmeter counter.
457 */
458size_t
459scpio(ssize_t (*f)(int, void *, size_t), int fd, void *_p, size_t l, off_t *c)
460{
461	u_char *p = (u_char *)_p;
462	size_t offset;
463	ssize_t r;
464	struct pollfd pfd;
465
466	pfd.fd = fd;
467	pfd.events = f == read ? POLLIN : POLLOUT;
468	for (offset = 0; offset < l;) {
469		r = f(fd, p + offset, l - offset);
470		if (r == 0) {
471			errno = EPIPE;
472			return offset;
473		}
474		if (r < 0) {
475			if (errno == EINTR)
476				continue;
477			if (errno == EAGAIN || errno == EWOULDBLOCK) {
478				(void)poll(&pfd, 1, -1); /* Ignore errors */
479				continue;
480			}
481			return offset;
482		}
483		offset += (size_t)r;
484		*c += (off_t)r;
485		if (limit_rate)
486			bwlimit(r);
487	}
488	return offset;
489}
490
491void
492toremote(char *targ, int argc, char **argv)
493{
494	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
495	arglist alist;
496	int i;
497
498	memset(&alist, '\0', sizeof(alist));
499	alist.list = NULL;
500
501	*targ++ = 0;
502	if (*targ == 0)
503		targ = ".";
504
505	arg = xstrdup(argv[argc - 1]);
506	if ((thost = strrchr(arg, '@'))) {
507		/* user@host */
508		*thost++ = 0;
509		tuser = arg;
510		if (*tuser == '\0')
511			tuser = NULL;
512	} else {
513		thost = arg;
514		tuser = NULL;
515	}
516
517	if (tuser != NULL && !okname(tuser)) {
518		xfree(arg);
519		return;
520	}
521
522	for (i = 0; i < argc - 1; i++) {
523		src = colon(argv[i]);
524		if (src) {	/* remote to remote */
525			freeargs(&alist);
526			addargs(&alist, "%s", ssh_program);
527			if (verbose_mode)
528				addargs(&alist, "-v");
529			addargs(&alist, "-x");
530			addargs(&alist, "-oClearAllForwardings yes");
531			addargs(&alist, "-n");
532
533			*src++ = 0;
534			if (*src == 0)
535				src = ".";
536			host = strrchr(argv[i], '@');
537
538			if (host) {
539				*host++ = 0;
540				host = cleanhostname(host);
541				suser = argv[i];
542				if (*suser == '\0')
543					suser = pwd->pw_name;
544				else if (!okname(suser))
545					continue;
546				addargs(&alist, "-l");
547				addargs(&alist, "%s", suser);
548			} else {
549				host = cleanhostname(argv[i]);
550			}
551			addargs(&alist, "%s", host);
552			addargs(&alist, "%s", cmd);
553			addargs(&alist, "%s", src);
554			addargs(&alist, "%s%s%s:%s",
555			    tuser ? tuser : "", tuser ? "@" : "",
556			    thost, targ);
557			if (do_local_cmd(&alist) != 0)
558				errs = 1;
559		} else {	/* local to remote */
560			if (remin == -1) {
561				xasprintf(&bp, "%s -t %s", cmd, targ);
562				host = cleanhostname(thost);
563				if (do_cmd(host, tuser, bp, &remin,
564				    &remout) < 0)
565					exit(1);
566				if (response() < 0)
567					exit(1);
568				(void) xfree(bp);
569			}
570			source(1, argv + i);
571		}
572	}
573	xfree(arg);
574}
575
576void
577tolocal(int argc, char **argv)
578{
579	char *bp, *host, *src, *suser;
580	arglist alist;
581	int i;
582
583	memset(&alist, '\0', sizeof(alist));
584	alist.list = NULL;
585
586	for (i = 0; i < argc - 1; i++) {
587		if (!(src = colon(argv[i]))) {	/* Local to local. */
588			freeargs(&alist);
589			addargs(&alist, "%s", _PATH_CP);
590			if (iamrecursive)
591				addargs(&alist, "-r");
592			if (pflag)
593				addargs(&alist, "-p");
594			addargs(&alist, "%s", argv[i]);
595			addargs(&alist, "%s", argv[argc-1]);
596			if (do_local_cmd(&alist))
597				++errs;
598			continue;
599		}
600		*src++ = 0;
601		if (*src == 0)
602			src = ".";
603		if ((host = strrchr(argv[i], '@')) == NULL) {
604			host = argv[i];
605			suser = NULL;
606		} else {
607			*host++ = 0;
608			suser = argv[i];
609			if (*suser == '\0')
610				suser = pwd->pw_name;
611		}
612		host = cleanhostname(host);
613		xasprintf(&bp, "%s -f %s", cmd, src);
614		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
615			(void) xfree(bp);
616			++errs;
617			continue;
618		}
619		xfree(bp);
620		sink(1, argv + argc - 1);
621		(void) close(remin);
622		remin = remout = -1;
623	}
624}
625
626void
627source(int argc, char **argv)
628{
629	struct stat stb;
630	static BUF buffer;
631	BUF *bp;
632	off_t i, statbytes;
633	size_t amt;
634	int fd = -1, haderr, indx;
635	char *last, *name, buf[2048], encname[MAXPATHLEN];
636	int len;
637
638	for (indx = 0; indx < argc; ++indx) {
639		name = argv[indx];
640		statbytes = 0;
641		len = strlen(name);
642		while (len > 1 && name[len-1] == '/')
643			name[--len] = '\0';
644		if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
645			goto syserr;
646		if (strchr(name, '\n') != NULL) {
647			strnvis(encname, name, sizeof(encname), VIS_NL);
648			name = encname;
649		}
650		if (fstat(fd, &stb) < 0) {
651syserr:			run_err("%s: %s", name, strerror(errno));
652			goto next;
653		}
654		if (stb.st_size < 0) {
655			run_err("%s: %s", name, "Negative file size");
656			goto next;
657		}
658		unset_nonblock(fd);
659		switch (stb.st_mode & S_IFMT) {
660		case S_IFREG:
661			break;
662		case S_IFDIR:
663			if (iamrecursive) {
664				rsource(name, &stb);
665				goto next;
666			}
667			/* FALLTHROUGH */
668		default:
669			run_err("%s: not a regular file", name);
670			goto next;
671		}
672		if ((last = strrchr(name, '/')) == NULL)
673			last = name;
674		else
675			++last;
676		curfile = last;
677		if (pflag) {
678			/*
679			 * Make it compatible with possible future
680			 * versions expecting microseconds.
681			 */
682			(void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
683			    (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime),
684			    (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime));
685			if (verbose_mode) {
686				fprintf(stderr, "File mtime %ld atime %ld\n",
687				    (long)stb.st_mtime, (long)stb.st_atime);
688				fprintf(stderr, "Sending file timestamps: %s",
689				    buf);
690			}
691			(void) atomicio(vwrite, remout, buf, strlen(buf));
692			if (response() < 0)
693				goto next;
694		}
695#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
696		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
697		    (u_int) (stb.st_mode & FILEMODEMASK),
698		    (long long)stb.st_size, last);
699		if (verbose_mode) {
700			fprintf(stderr, "Sending file modes: %s", buf);
701		}
702		(void) atomicio(vwrite, remout, buf, strlen(buf));
703		if (response() < 0)
704			goto next;
705		if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
706next:			if (fd != -1) {
707				(void) close(fd);
708				fd = -1;
709			}
710			continue;
711		}
712		if (showprogress)
713			start_progress_meter(curfile, stb.st_size, &statbytes);
714		set_nonblock(remout);
715		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
716			amt = bp->cnt;
717			if (i + (off_t)amt > stb.st_size)
718				amt = stb.st_size - i;
719			if (!haderr) {
720				if (atomicio(read, fd, bp->buf, amt) != amt)
721					haderr = errno;
722			}
723			/* Keep writing after error to retain sync */
724			if (haderr) {
725				(void)atomicio(vwrite, remout, bp->buf, amt);
726				continue;
727			}
728			if (scpio(vwrite, remout, bp->buf, amt,
729			    &statbytes) != amt)
730				haderr = errno;
731		}
732		unset_nonblock(remout);
733		if (showprogress)
734			stop_progress_meter();
735
736		if (fd != -1) {
737			if (close(fd) < 0 && !haderr)
738				haderr = errno;
739			fd = -1;
740		}
741		if (!haderr)
742			(void) atomicio(vwrite, remout, "", 1);
743		else
744			run_err("%s: %s", name, strerror(haderr));
745		(void) response();
746	}
747}
748
749void
750rsource(char *name, struct stat *statp)
751{
752	DIR *dirp;
753	struct dirent *dp;
754	char *last, *vect[1], path[1100];
755
756	if (!(dirp = opendir(name))) {
757		run_err("%s: %s", name, strerror(errno));
758		return;
759	}
760	last = strrchr(name, '/');
761	if (last == 0)
762		last = name;
763	else
764		last++;
765	if (pflag) {
766		(void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
767		    (u_long) statp->st_mtime,
768		    (u_long) statp->st_atime);
769		(void) atomicio(vwrite, remout, path, strlen(path));
770		if (response() < 0) {
771			closedir(dirp);
772			return;
773		}
774	}
775	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
776	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
777	if (verbose_mode)
778		fprintf(stderr, "Entering directory: %s", path);
779	(void) atomicio(vwrite, remout, path, strlen(path));
780	if (response() < 0) {
781		closedir(dirp);
782		return;
783	}
784	while ((dp = readdir(dirp)) != NULL) {
785		if (dp->d_ino == 0)
786			continue;
787		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
788			continue;
789		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
790			run_err("%s/%s: name too long", name, dp->d_name);
791			continue;
792		}
793		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
794		vect[0] = path;
795		source(1, vect);
796	}
797	(void) closedir(dirp);
798	(void) atomicio(vwrite, remout, "E\n", 2);
799	(void) response();
800}
801
802void
803bwlimit(int amount)
804{
805	static struct timeval bwstart, bwend;
806	static int lamt, thresh = 16384;
807	u_int64_t waitlen;
808	struct timespec ts, rm;
809
810	if (!timerisset(&bwstart)) {
811		gettimeofday(&bwstart, NULL);
812		return;
813	}
814
815	lamt += amount;
816	if (lamt < thresh)
817		return;
818
819	gettimeofday(&bwend, NULL);
820	timersub(&bwend, &bwstart, &bwend);
821	if (!timerisset(&bwend))
822		return;
823
824	lamt *= 8;
825	waitlen = (double)1000000L * lamt / limit_rate;
826
827	bwstart.tv_sec = waitlen / 1000000L;
828	bwstart.tv_usec = waitlen % 1000000L;
829
830	if (timercmp(&bwstart, &bwend, >)) {
831		timersub(&bwstart, &bwend, &bwend);
832
833		/* Adjust the wait time */
834		if (bwend.tv_sec) {
835			thresh /= 2;
836			if (thresh < 2048)
837				thresh = 2048;
838		} else if (bwend.tv_usec < 10000) {
839			thresh *= 2;
840			if (thresh > COPY_BUFLEN * 4)
841				thresh = COPY_BUFLEN * 4;
842		}
843
844		TIMEVAL_TO_TIMESPEC(&bwend, &ts);
845		while (nanosleep(&ts, &rm) == -1) {
846			if (errno != EINTR)
847				break;
848			ts = rm;
849		}
850	}
851
852	lamt = 0;
853	gettimeofday(&bwstart, NULL);
854}
855
856void
857sink(int argc, char **argv)
858{
859	static BUF buffer;
860	struct stat stb;
861	enum {
862		YES, NO, DISPLAYED
863	} wrerr;
864	BUF *bp;
865	off_t i;
866	size_t j, count;
867	int amt, exists, first, ofd;
868	mode_t mode, omode, mask;
869	off_t size, statbytes;
870	int setimes, targisdir, wrerrno = 0;
871	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
872	struct timeval tv[2];
873
874#define	atime	tv[0]
875#define	mtime	tv[1]
876#define	SCREWUP(str)	{ why = str; goto screwup; }
877
878	setimes = targisdir = 0;
879	mask = umask(0);
880	if (!pflag)
881		(void) umask(mask);
882	if (argc != 1) {
883		run_err("ambiguous target");
884		exit(1);
885	}
886	targ = *argv;
887	if (targetshouldbedirectory)
888		verifydir(targ);
889
890	(void) atomicio(vwrite, remout, "", 1);
891	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
892		targisdir = 1;
893	for (first = 1;; first = 0) {
894		cp = buf;
895		if (atomicio(read, remin, cp, 1) != 1)
896			return;
897		if (*cp++ == '\n')
898			SCREWUP("unexpected <newline>");
899		do {
900			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
901				SCREWUP("lost connection");
902			*cp++ = ch;
903		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
904		*cp = 0;
905		if (verbose_mode)
906			fprintf(stderr, "Sink: %s", buf);
907
908		if (buf[0] == '\01' || buf[0] == '\02') {
909			if (iamremote == 0)
910				(void) atomicio(vwrite, STDERR_FILENO,
911				    buf + 1, strlen(buf + 1));
912			if (buf[0] == '\02')
913				exit(1);
914			++errs;
915			continue;
916		}
917		if (buf[0] == 'E') {
918			(void) atomicio(vwrite, remout, "", 1);
919			return;
920		}
921		if (ch == '\n')
922			*--cp = 0;
923
924		cp = buf;
925		if (*cp == 'T') {
926			setimes++;
927			cp++;
928			mtime.tv_sec = strtol(cp, &cp, 10);
929			if (!cp || *cp++ != ' ')
930				SCREWUP("mtime.sec not delimited");
931			mtime.tv_usec = strtol(cp, &cp, 10);
932			if (!cp || *cp++ != ' ')
933				SCREWUP("mtime.usec not delimited");
934			atime.tv_sec = strtol(cp, &cp, 10);
935			if (!cp || *cp++ != ' ')
936				SCREWUP("atime.sec not delimited");
937			atime.tv_usec = strtol(cp, &cp, 10);
938			if (!cp || *cp++ != '\0')
939				SCREWUP("atime.usec not delimited");
940			(void) atomicio(vwrite, remout, "", 1);
941			continue;
942		}
943		if (*cp != 'C' && *cp != 'D') {
944			/*
945			 * Check for the case "rcp remote:foo\* local:bar".
946			 * In this case, the line "No match." can be returned
947			 * by the shell before the rcp command on the remote is
948			 * executed so the ^Aerror_message convention isn't
949			 * followed.
950			 */
951			if (first) {
952				run_err("%s", cp);
953				exit(1);
954			}
955			SCREWUP("expected control record");
956		}
957		mode = 0;
958		for (++cp; cp < buf + 5; cp++) {
959			if (*cp < '0' || *cp > '7')
960				SCREWUP("bad mode");
961			mode = (mode << 3) | (*cp - '0');
962		}
963		if (*cp++ != ' ')
964			SCREWUP("mode not delimited");
965
966		for (size = 0; isdigit(*cp);)
967			size = size * 10 + (*cp++ - '0');
968		if (*cp++ != ' ')
969			SCREWUP("size not delimited");
970		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
971			run_err("error: unexpected filename: %s", cp);
972			exit(1);
973		}
974		if (targisdir) {
975			static char *namebuf;
976			static size_t cursize;
977			size_t need;
978
979			need = strlen(targ) + strlen(cp) + 250;
980			if (need > cursize) {
981				if (namebuf)
982					xfree(namebuf);
983				namebuf = xmalloc(need);
984				cursize = need;
985			}
986			(void) snprintf(namebuf, need, "%s%s%s", targ,
987			    strcmp(targ, "/") ? "/" : "", cp);
988			np = namebuf;
989		} else
990			np = targ;
991		curfile = cp;
992		exists = stat(np, &stb) == 0;
993		if (buf[0] == 'D') {
994			int mod_flag = pflag;
995			if (!iamrecursive)
996				SCREWUP("received directory without -r");
997			if (exists) {
998				if (!S_ISDIR(stb.st_mode)) {
999					errno = ENOTDIR;
1000					goto bad;
1001				}
1002				if (pflag)
1003					(void) chmod(np, mode);
1004			} else {
1005				/* Handle copying from a read-only
1006				   directory */
1007				mod_flag = 1;
1008				if (mkdir(np, mode | S_IRWXU) < 0)
1009					goto bad;
1010			}
1011			vect[0] = xstrdup(np);
1012			sink(1, vect);
1013			if (setimes) {
1014				setimes = 0;
1015				if (utimes(vect[0], tv) < 0)
1016					run_err("%s: set times: %s",
1017					    vect[0], strerror(errno));
1018			}
1019			if (mod_flag)
1020				(void) chmod(vect[0], mode);
1021			if (vect[0])
1022				xfree(vect[0]);
1023			continue;
1024		}
1025		omode = mode;
1026		mode |= S_IWRITE;
1027		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1028bad:			run_err("%s: %s", np, strerror(errno));
1029			continue;
1030		}
1031		(void) atomicio(vwrite, remout, "", 1);
1032		if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1033			(void) close(ofd);
1034			continue;
1035		}
1036		cp = bp->buf;
1037		wrerr = NO;
1038
1039		statbytes = 0;
1040		if (showprogress)
1041			start_progress_meter(curfile, size, &statbytes);
1042		set_nonblock(remin);
1043		for (count = i = 0; i < size; i += bp->cnt) {
1044			amt = bp->cnt;
1045			if (i + amt > size)
1046				amt = size - i;
1047			count += amt;
1048			do {
1049				j = scpio(read, remin, cp, amt, &statbytes);
1050				if (j == 0) {
1051					run_err("%s", j != EPIPE ?
1052					    strerror(errno) :
1053					    "dropped connection");
1054					exit(1);
1055				}
1056				amt -= j;
1057				cp += j;
1058			} while (amt > 0);
1059
1060			if (count == bp->cnt) {
1061				/* Keep reading so we stay sync'd up. */
1062				if (wrerr == NO) {
1063					if (atomicio(vwrite, ofd, bp->buf,
1064					    count) != count) {
1065						wrerr = YES;
1066						wrerrno = errno;
1067					}
1068				}
1069				count = 0;
1070				cp = bp->buf;
1071			}
1072		}
1073		unset_nonblock(remin);
1074		if (showprogress)
1075			stop_progress_meter();
1076		if (count != 0 && wrerr == NO &&
1077		    atomicio(vwrite, ofd, bp->buf, count) != count) {
1078			wrerr = YES;
1079			wrerrno = errno;
1080		}
1081		if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1082		    ftruncate(ofd, size) != 0) {
1083			run_err("%s: truncate: %s", np, strerror(errno));
1084			wrerr = DISPLAYED;
1085		}
1086		if (pflag) {
1087			if (exists || omode != mode)
1088#ifdef HAVE_FCHMOD
1089				if (fchmod(ofd, omode)) {
1090#else /* HAVE_FCHMOD */
1091				if (chmod(np, omode)) {
1092#endif /* HAVE_FCHMOD */
1093					run_err("%s: set mode: %s",
1094					    np, strerror(errno));
1095					wrerr = DISPLAYED;
1096				}
1097		} else {
1098			if (!exists && omode != mode)
1099#ifdef HAVE_FCHMOD
1100				if (fchmod(ofd, omode & ~mask)) {
1101#else /* HAVE_FCHMOD */
1102				if (chmod(np, omode & ~mask)) {
1103#endif /* HAVE_FCHMOD */
1104					run_err("%s: set mode: %s",
1105					    np, strerror(errno));
1106					wrerr = DISPLAYED;
1107				}
1108		}
1109		if (close(ofd) == -1) {
1110			wrerr = YES;
1111			wrerrno = errno;
1112		}
1113		(void) response();
1114		if (setimes && wrerr == NO) {
1115			setimes = 0;
1116			if (utimes(np, tv) < 0) {
1117				run_err("%s: set times: %s",
1118				    np, strerror(errno));
1119				wrerr = DISPLAYED;
1120			}
1121		}
1122		switch (wrerr) {
1123		case YES:
1124			run_err("%s: %s", np, strerror(wrerrno));
1125			break;
1126		case NO:
1127			(void) atomicio(vwrite, remout, "", 1);
1128			break;
1129		case DISPLAYED:
1130			break;
1131		}
1132	}
1133screwup:
1134	run_err("protocol error: %s", why);
1135	exit(1);
1136}
1137
1138int
1139response(void)
1140{
1141	char ch, *cp, resp, rbuf[2048];
1142
1143	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1144		lostconn(0);
1145
1146	cp = rbuf;
1147	switch (resp) {
1148	case 0:		/* ok */
1149		return (0);
1150	default:
1151		*cp++ = resp;
1152		/* FALLTHROUGH */
1153	case 1:		/* error, followed by error msg */
1154	case 2:		/* fatal error, "" */
1155		do {
1156			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1157				lostconn(0);
1158			*cp++ = ch;
1159		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1160
1161		if (!iamremote)
1162			(void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1163		++errs;
1164		if (resp == 1)
1165			return (-1);
1166		exit(1);
1167	}
1168	/* NOTREACHED */
1169}
1170
1171void
1172usage(void)
1173{
1174	(void) fprintf(stderr,
1175	    "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1176	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1177	    "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1178	exit(1);
1179}
1180
1181void
1182run_err(const char *fmt,...)
1183{
1184	static FILE *fp;
1185	va_list ap;
1186
1187	++errs;
1188	if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1189		(void) fprintf(fp, "%c", 0x01);
1190		(void) fprintf(fp, "scp: ");
1191		va_start(ap, fmt);
1192		(void) vfprintf(fp, fmt, ap);
1193		va_end(ap);
1194		(void) fprintf(fp, "\n");
1195		(void) fflush(fp);
1196	}
1197
1198	if (!iamremote) {
1199		va_start(ap, fmt);
1200		vfprintf(stderr, fmt, ap);
1201		va_end(ap);
1202		fprintf(stderr, "\n");
1203	}
1204}
1205
1206void
1207verifydir(char *cp)
1208{
1209	struct stat stb;
1210
1211	if (!stat(cp, &stb)) {
1212		if (S_ISDIR(stb.st_mode))
1213			return;
1214		errno = ENOTDIR;
1215	}
1216	run_err("%s: %s", cp, strerror(errno));
1217	killchild(0);
1218}
1219
1220int
1221okname(char *cp0)
1222{
1223	int c;
1224	char *cp;
1225
1226	cp = cp0;
1227	do {
1228		c = (int)*cp;
1229		if (c & 0200)
1230			goto bad;
1231		if (!isalpha(c) && !isdigit(c)) {
1232			switch (c) {
1233			case '\'':
1234			case '"':
1235			case '`':
1236			case ' ':
1237			case '#':
1238				goto bad;
1239			default:
1240				break;
1241			}
1242		}
1243	} while (*++cp);
1244	return (1);
1245
1246bad:	fprintf(stderr, "%s: invalid user name\n", cp0);
1247	return (0);
1248}
1249
1250BUF *
1251allocbuf(BUF *bp, int fd, int blksize)
1252{
1253	size_t size;
1254#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1255	struct stat stb;
1256
1257	if (fstat(fd, &stb) < 0) {
1258		run_err("fstat: %s", strerror(errno));
1259		return (0);
1260	}
1261	size = roundup(stb.st_blksize, blksize);
1262	if (size == 0)
1263		size = blksize;
1264#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1265	size = blksize;
1266#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1267	if (bp->cnt >= size)
1268		return (bp);
1269	if (bp->buf == NULL)
1270		bp->buf = xmalloc(size);
1271	else
1272		bp->buf = xrealloc(bp->buf, 1, size);
1273	memset(bp->buf, 0, size);
1274	bp->cnt = size;
1275	return (bp);
1276}
1277
1278void
1279lostconn(int signo)
1280{
1281	if (!iamremote)
1282		write(STDERR_FILENO, "lost connection\n", 16);
1283	if (signo)
1284		_exit(1);
1285	else
1286		exit(1);
1287}
1288