scp.c revision 157019 
1/*
2 * scp - secure remote copy.  This is basically patched BSD rcp which
3 * uses ssh to do the data transfer (instead of using rcmd).
4 *
5 * NOTE: This version should NOT be suid root.  (This uses ssh to
6 * do the transfer and ssh has the necessary privileges.)
7 *
8 * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
9 *
10 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose.  Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 */
16/*
17 * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
18 * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 *    notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 *    notice, this list of conditions and the following disclaimer in the
27 *    documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 */
40
41/*
42 * Parts from:
43 *
44 * Copyright (c) 1983, 1990, 1992, 1993, 1995
45 *	The Regents of the University of California.  All rights reserved.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 *    notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 *    notice, this list of conditions and the following disclaimer in the
54 *    documentation and/or other materials provided with the distribution.
55 * 3. Neither the name of the University nor the names of its contributors
56 *    may be used to endorse or promote products derived from this software
57 *    without specific prior written permission.
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 */
72
73#include "includes.h"
74RCSID("$OpenBSD: scp.c,v 1.130 2006/01/31 10:35:43 djm Exp $");
75
76#include "xmalloc.h"
77#include "atomicio.h"
78#include "pathnames.h"
79#include "log.h"
80#include "misc.h"
81#include "progressmeter.h"
82
83extern char *__progname;
84
85void bwlimit(int);
86
87/* Struct for addargs */
88arglist args;
89
90/* Bandwidth limit */
91off_t limit_rate = 0;
92
93/* Name of current file being transferred. */
94char *curfile;
95
96/* This is set to non-zero to enable verbose mode. */
97int verbose_mode = 0;
98
99/* This is set to zero if the progressmeter is not desired. */
100int showprogress = 1;
101
102/* This is the program to execute for the secured connection. ("ssh" or -S) */
103char *ssh_program = _PATH_SSH_PROGRAM;
104
105/* This is used to store the pid of ssh_program */
106pid_t do_cmd_pid = -1;
107
108static void
109killchild(int signo)
110{
111	if (do_cmd_pid > 1) {
112		kill(do_cmd_pid, signo ? signo : SIGTERM);
113		waitpid(do_cmd_pid, NULL, 0);
114	}
115
116	if (signo)
117		_exit(1);
118	exit(1);
119}
120
121static int
122do_local_cmd(arglist *a)
123{
124	u_int i;
125	int status;
126	pid_t pid;
127
128	if (a->num == 0)
129		fatal("do_local_cmd: no arguments");
130
131	if (verbose_mode) {
132		fprintf(stderr, "Executing:");
133		for (i = 0; i < a->num; i++)
134			fprintf(stderr, " %s", a->list[i]);
135		fprintf(stderr, "\n");
136	}
137	if ((pid = fork()) == -1)
138		fatal("do_local_cmd: fork: %s", strerror(errno));
139
140	if (pid == 0) {
141		execvp(a->list[0], a->list);
142		perror(a->list[0]);
143		exit(1);
144	}
145
146	do_cmd_pid = pid;
147	signal(SIGTERM, killchild);
148	signal(SIGINT, killchild);
149	signal(SIGHUP, killchild);
150
151	while (waitpid(pid, &status, 0) == -1)
152		if (errno != EINTR)
153			fatal("do_local_cmd: waitpid: %s", strerror(errno));
154
155	do_cmd_pid = -1;
156
157	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
158		return (-1);
159
160	return (0);
161}
162
163/*
164 * This function executes the given command as the specified user on the
165 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
166 * assigns the input and output file descriptors on success.
167 */
168
169int
170do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
171{
172	int pin[2], pout[2], reserved[2];
173
174	if (verbose_mode)
175		fprintf(stderr,
176		    "Executing: program %s host %s, user %s, command %s\n",
177		    ssh_program, host,
178		    remuser ? remuser : "(unspecified)", cmd);
179
180	/*
181	 * Reserve two descriptors so that the real pipes won't get
182	 * descriptors 0 and 1 because that will screw up dup2 below.
183	 */
184	pipe(reserved);
185
186	/* Create a socket pair for communicating with ssh. */
187	if (pipe(pin) < 0)
188		fatal("pipe: %s", strerror(errno));
189	if (pipe(pout) < 0)
190		fatal("pipe: %s", strerror(errno));
191
192	/* Free the reserved descriptors. */
193	close(reserved[0]);
194	close(reserved[1]);
195
196	/* Fork a child to execute the command on the remote host using ssh. */
197	do_cmd_pid = fork();
198	if (do_cmd_pid == 0) {
199		/* Child. */
200		close(pin[1]);
201		close(pout[0]);
202		dup2(pin[0], 0);
203		dup2(pout[1], 1);
204		close(pin[0]);
205		close(pout[1]);
206
207		replacearg(&args, 0, "%s", ssh_program);
208		if (remuser != NULL)
209			addargs(&args, "-l%s", remuser);
210		addargs(&args, "%s", host);
211		addargs(&args, "%s", cmd);
212
213		execvp(ssh_program, args.list);
214		perror(ssh_program);
215		exit(1);
216	} else if (do_cmd_pid == -1) {
217		fatal("fork: %s", strerror(errno));
218	}
219	/* Parent.  Close the other side, and return the local side. */
220	close(pin[0]);
221	*fdout = pin[1];
222	close(pout[1]);
223	*fdin = pout[0];
224	signal(SIGTERM, killchild);
225	signal(SIGINT, killchild);
226	signal(SIGHUP, killchild);
227	return 0;
228}
229
230typedef struct {
231	size_t cnt;
232	char *buf;
233} BUF;
234
235BUF *allocbuf(BUF *, int, int);
236void lostconn(int);
237void nospace(void);
238int okname(char *);
239void run_err(const char *,...);
240void verifydir(char *);
241
242struct passwd *pwd;
243uid_t userid;
244int errs, remin, remout;
245int pflag, iamremote, iamrecursive, targetshouldbedirectory;
246
247#define	CMDNEEDS	64
248char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
249
250int response(void);
251void rsource(char *, struct stat *);
252void sink(int, char *[]);
253void source(int, char *[]);
254void tolocal(int, char *[]);
255void toremote(char *, int, char *[]);
256void usage(void);
257
258int
259main(int argc, char **argv)
260{
261	int ch, fflag, tflag, status;
262	double speed;
263	char *targ, *endp;
264	extern char *optarg;
265	extern int optind;
266
267	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
268	sanitise_stdfd();
269
270	__progname = ssh_get_progname(argv[0]);
271
272	memset(&args, '\0', sizeof(args));
273	args.list = NULL;
274	addargs(&args, "%s", ssh_program);
275	addargs(&args, "-x");
276	addargs(&args, "-oForwardAgent no");
277	addargs(&args, "-oPermitLocalCommand no");
278	addargs(&args, "-oClearAllForwardings yes");
279
280	fflag = tflag = 0;
281	while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
282		switch (ch) {
283		/* User-visible flags. */
284		case '1':
285		case '2':
286		case '4':
287		case '6':
288		case 'C':
289			addargs(&args, "-%c", ch);
290			break;
291		case 'o':
292		case 'c':
293		case 'i':
294		case 'F':
295			addargs(&args, "-%c%s", ch, optarg);
296			break;
297		case 'P':
298			addargs(&args, "-p%s", optarg);
299			break;
300		case 'B':
301			addargs(&args, "-oBatchmode yes");
302			break;
303		case 'l':
304			speed = strtod(optarg, &endp);
305			if (speed <= 0 || *endp != '\0')
306				usage();
307			limit_rate = speed * 1024;
308			break;
309		case 'p':
310			pflag = 1;
311			break;
312		case 'r':
313			iamrecursive = 1;
314			break;
315		case 'S':
316			ssh_program = xstrdup(optarg);
317			break;
318		case 'v':
319			addargs(&args, "-v");
320			verbose_mode = 1;
321			break;
322		case 'q':
323			addargs(&args, "-q");
324			showprogress = 0;
325			break;
326
327		/* Server options. */
328		case 'd':
329			targetshouldbedirectory = 1;
330			break;
331		case 'f':	/* "from" */
332			iamremote = 1;
333			fflag = 1;
334			break;
335		case 't':	/* "to" */
336			iamremote = 1;
337			tflag = 1;
338#ifdef HAVE_CYGWIN
339			setmode(0, O_BINARY);
340#endif
341			break;
342		default:
343			usage();
344		}
345	argc -= optind;
346	argv += optind;
347
348	if ((pwd = getpwuid(userid = getuid())) == NULL)
349		fatal("unknown user %u", (u_int) userid);
350
351	if (!isatty(STDERR_FILENO))
352		showprogress = 0;
353
354	remin = STDIN_FILENO;
355	remout = STDOUT_FILENO;
356
357	if (fflag) {
358		/* Follow "protocol", send data. */
359		(void) response();
360		source(argc, argv);
361		exit(errs != 0);
362	}
363	if (tflag) {
364		/* Receive data. */
365		sink(argc, argv);
366		exit(errs != 0);
367	}
368	if (argc < 2)
369		usage();
370	if (argc > 2)
371		targetshouldbedirectory = 1;
372
373	remin = remout = -1;
374	do_cmd_pid = -1;
375	/* Command to be executed on remote system using "ssh". */
376	(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
377	    verbose_mode ? " -v" : "",
378	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
379	    targetshouldbedirectory ? " -d" : "");
380
381	(void) signal(SIGPIPE, lostconn);
382
383	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
384		toremote(targ, argc, argv);
385	else {
386		if (targetshouldbedirectory)
387			verifydir(argv[argc - 1]);
388		tolocal(argc, argv);	/* Dest is local host. */
389	}
390	/*
391	 * Finally check the exit status of the ssh process, if one was forked
392	 * and no error has occured yet
393	 */
394	if (do_cmd_pid != -1 && errs == 0) {
395		if (remin != -1)
396		    (void) close(remin);
397		if (remout != -1)
398		    (void) close(remout);
399		if (waitpid(do_cmd_pid, &status, 0) == -1)
400			errs = 1;
401		else {
402			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
403				errs = 1;
404		}
405	}
406	exit(errs != 0);
407}
408
409void
410toremote(char *targ, int argc, char **argv)
411{
412	int i, len;
413	char *bp, *host, *src, *suser, *thost, *tuser, *arg;
414	arglist alist;
415
416	memset(&alist, '\0', sizeof(alist));
417	alist.list = NULL;
418
419	*targ++ = 0;
420	if (*targ == 0)
421		targ = ".";
422
423	arg = xstrdup(argv[argc - 1]);
424	if ((thost = strrchr(arg, '@'))) {
425		/* user@host */
426		*thost++ = 0;
427		tuser = arg;
428		if (*tuser == '\0')
429			tuser = NULL;
430	} else {
431		thost = arg;
432		tuser = NULL;
433	}
434
435	if (tuser != NULL && !okname(tuser)) {
436		xfree(arg);
437		return;
438	}
439
440	for (i = 0; i < argc - 1; i++) {
441		src = colon(argv[i]);
442		if (src) {	/* remote to remote */
443			freeargs(&alist);
444			addargs(&alist, "%s", ssh_program);
445			if (verbose_mode)
446				addargs(&alist, "-v");
447			addargs(&alist, "-x");
448			addargs(&alist, "-oClearAllForwardings yes");
449			addargs(&alist, "-n");
450
451			*src++ = 0;
452			if (*src == 0)
453				src = ".";
454			host = strrchr(argv[i], '@');
455
456			if (host) {
457				*host++ = 0;
458				host = cleanhostname(host);
459				suser = argv[i];
460				if (*suser == '\0')
461					suser = pwd->pw_name;
462				else if (!okname(suser))
463					continue;
464				addargs(&alist, "-l");
465				addargs(&alist, "%s", suser);
466			} else {
467				host = cleanhostname(argv[i]);
468			}
469			addargs(&alist, "%s", host);
470			addargs(&alist, "%s", cmd);
471			addargs(&alist, "%s", src);
472			addargs(&alist, "%s%s%s:%s",
473			    tuser ? tuser : "", tuser ? "@" : "",
474			    thost, targ);
475			if (do_local_cmd(&alist) != 0)
476				errs = 1;
477		} else {	/* local to remote */
478			if (remin == -1) {
479				len = strlen(targ) + CMDNEEDS + 20;
480				bp = xmalloc(len);
481				(void) snprintf(bp, len, "%s -t %s", cmd, targ);
482				host = cleanhostname(thost);
483				if (do_cmd(host, tuser, bp, &remin,
484				    &remout, argc) < 0)
485					exit(1);
486				if (response() < 0)
487					exit(1);
488				(void) xfree(bp);
489			}
490			source(1, argv + i);
491		}
492	}
493}
494
495void
496tolocal(int argc, char **argv)
497{
498	int i, len;
499	char *bp, *host, *src, *suser;
500	arglist alist;
501
502	memset(&alist, '\0', sizeof(alist));
503	alist.list = NULL;
504
505	for (i = 0; i < argc - 1; i++) {
506		if (!(src = colon(argv[i]))) {	/* Local to local. */
507			freeargs(&alist);
508			addargs(&alist, "%s", _PATH_CP);
509			if (iamrecursive)
510				addargs(&alist, "-r");
511			if (pflag)
512				addargs(&alist, "-p");
513			addargs(&alist, "%s", argv[i]);
514			addargs(&alist, "%s", argv[argc-1]);
515			if (do_local_cmd(&alist))
516				++errs;
517			continue;
518		}
519		*src++ = 0;
520		if (*src == 0)
521			src = ".";
522		if ((host = strrchr(argv[i], '@')) == NULL) {
523			host = argv[i];
524			suser = NULL;
525		} else {
526			*host++ = 0;
527			suser = argv[i];
528			if (*suser == '\0')
529				suser = pwd->pw_name;
530		}
531		host = cleanhostname(host);
532		len = strlen(src) + CMDNEEDS + 20;
533		bp = xmalloc(len);
534		(void) snprintf(bp, len, "%s -f %s", cmd, src);
535		if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
536			(void) xfree(bp);
537			++errs;
538			continue;
539		}
540		xfree(bp);
541		sink(1, argv + argc - 1);
542		(void) close(remin);
543		remin = remout = -1;
544	}
545}
546
547void
548source(int argc, char **argv)
549{
550	struct stat stb;
551	static BUF buffer;
552	BUF *bp;
553	off_t i, amt, statbytes;
554	size_t result;
555	int fd = -1, haderr, indx;
556	char *last, *name, buf[2048];
557	int len;
558
559	for (indx = 0; indx < argc; ++indx) {
560		name = argv[indx];
561		statbytes = 0;
562		len = strlen(name);
563		while (len > 1 && name[len-1] == '/')
564			name[--len] = '\0';
565		if (strchr(name, '\n') != NULL) {
566			run_err("%s: skipping, filename contains a newline",
567			    name);
568			goto next;
569		}
570		if ((fd = open(name, O_RDONLY, 0)) < 0)
571			goto syserr;
572		if (fstat(fd, &stb) < 0) {
573syserr:			run_err("%s: %s", name, strerror(errno));
574			goto next;
575		}
576		switch (stb.st_mode & S_IFMT) {
577		case S_IFREG:
578			break;
579		case S_IFDIR:
580			if (iamrecursive) {
581				rsource(name, &stb);
582				goto next;
583			}
584			/* FALLTHROUGH */
585		default:
586			run_err("%s: not a regular file", name);
587			goto next;
588		}
589		if ((last = strrchr(name, '/')) == NULL)
590			last = name;
591		else
592			++last;
593		curfile = last;
594		if (pflag) {
595			/*
596			 * Make it compatible with possible future
597			 * versions expecting microseconds.
598			 */
599			(void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
600			    (u_long) stb.st_mtime,
601			    (u_long) stb.st_atime);
602			(void) atomicio(vwrite, remout, buf, strlen(buf));
603			if (response() < 0)
604				goto next;
605		}
606#define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
607		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
608		    (u_int) (stb.st_mode & FILEMODEMASK),
609		    (long long)stb.st_size, last);
610		if (verbose_mode) {
611			fprintf(stderr, "Sending file modes: %s", buf);
612		}
613		(void) atomicio(vwrite, remout, buf, strlen(buf));
614		if (response() < 0)
615			goto next;
616		if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
617next:			if (fd != -1) {
618				(void) close(fd);
619				fd = -1;
620			}
621			continue;
622		}
623		if (showprogress)
624			start_progress_meter(curfile, stb.st_size, &statbytes);
625		/* Keep writing after an error so that we stay sync'd up. */
626		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
627			amt = bp->cnt;
628			if (i + amt > stb.st_size)
629				amt = stb.st_size - i;
630			if (!haderr) {
631				result = atomicio(read, fd, bp->buf, amt);
632				if (result != amt)
633					haderr = errno;
634			}
635			if (haderr)
636				(void) atomicio(vwrite, remout, bp->buf, amt);
637			else {
638				result = atomicio(vwrite, remout, bp->buf, amt);
639				if (result != amt)
640					haderr = errno;
641				statbytes += result;
642			}
643			if (limit_rate)
644				bwlimit(amt);
645		}
646		if (showprogress)
647			stop_progress_meter();
648
649		if (fd != -1) {
650			if (close(fd) < 0 && !haderr)
651				haderr = errno;
652			fd = -1;
653		}
654		if (!haderr)
655			(void) atomicio(vwrite, remout, "", 1);
656		else
657			run_err("%s: %s", name, strerror(haderr));
658		(void) response();
659	}
660}
661
662void
663rsource(char *name, struct stat *statp)
664{
665	DIR *dirp;
666	struct dirent *dp;
667	char *last, *vect[1], path[1100];
668
669	if (!(dirp = opendir(name))) {
670		run_err("%s: %s", name, strerror(errno));
671		return;
672	}
673	last = strrchr(name, '/');
674	if (last == 0)
675		last = name;
676	else
677		last++;
678	if (pflag) {
679		(void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
680		    (u_long) statp->st_mtime,
681		    (u_long) statp->st_atime);
682		(void) atomicio(vwrite, remout, path, strlen(path));
683		if (response() < 0) {
684			closedir(dirp);
685			return;
686		}
687	}
688	(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
689	    (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
690	if (verbose_mode)
691		fprintf(stderr, "Entering directory: %s", path);
692	(void) atomicio(vwrite, remout, path, strlen(path));
693	if (response() < 0) {
694		closedir(dirp);
695		return;
696	}
697	while ((dp = readdir(dirp)) != NULL) {
698		if (dp->d_ino == 0)
699			continue;
700		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
701			continue;
702		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
703			run_err("%s/%s: name too long", name, dp->d_name);
704			continue;
705		}
706		(void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
707		vect[0] = path;
708		source(1, vect);
709	}
710	(void) closedir(dirp);
711	(void) atomicio(vwrite, remout, "E\n", 2);
712	(void) response();
713}
714
715void
716bwlimit(int amount)
717{
718	static struct timeval bwstart, bwend;
719	static int lamt, thresh = 16384;
720	u_int64_t waitlen;
721	struct timespec ts, rm;
722
723	if (!timerisset(&bwstart)) {
724		gettimeofday(&bwstart, NULL);
725		return;
726	}
727
728	lamt += amount;
729	if (lamt < thresh)
730		return;
731
732	gettimeofday(&bwend, NULL);
733	timersub(&bwend, &bwstart, &bwend);
734	if (!timerisset(&bwend))
735		return;
736
737	lamt *= 8;
738	waitlen = (double)1000000L * lamt / limit_rate;
739
740	bwstart.tv_sec = waitlen / 1000000L;
741	bwstart.tv_usec = waitlen % 1000000L;
742
743	if (timercmp(&bwstart, &bwend, >)) {
744		timersub(&bwstart, &bwend, &bwend);
745
746		/* Adjust the wait time */
747		if (bwend.tv_sec) {
748			thresh /= 2;
749			if (thresh < 2048)
750				thresh = 2048;
751		} else if (bwend.tv_usec < 100) {
752			thresh *= 2;
753			if (thresh > 32768)
754				thresh = 32768;
755		}
756
757		TIMEVAL_TO_TIMESPEC(&bwend, &ts);
758		while (nanosleep(&ts, &rm) == -1) {
759			if (errno != EINTR)
760				break;
761			ts = rm;
762		}
763	}
764
765	lamt = 0;
766	gettimeofday(&bwstart, NULL);
767}
768
769void
770sink(int argc, char **argv)
771{
772	static BUF buffer;
773	struct stat stb;
774	enum {
775		YES, NO, DISPLAYED
776	} wrerr;
777	BUF *bp;
778	off_t i;
779	size_t j, count;
780	int amt, exists, first, mask, mode, ofd, omode;
781	off_t size, statbytes;
782	int setimes, targisdir, wrerrno = 0;
783	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
784	struct timeval tv[2];
785
786#define	atime	tv[0]
787#define	mtime	tv[1]
788#define	SCREWUP(str)	{ why = str; goto screwup; }
789
790	setimes = targisdir = 0;
791	mask = umask(0);
792	if (!pflag)
793		(void) umask(mask);
794	if (argc != 1) {
795		run_err("ambiguous target");
796		exit(1);
797	}
798	targ = *argv;
799	if (targetshouldbedirectory)
800		verifydir(targ);
801
802	(void) atomicio(vwrite, remout, "", 1);
803	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
804		targisdir = 1;
805	for (first = 1;; first = 0) {
806		cp = buf;
807		if (atomicio(read, remin, cp, 1) != 1)
808			return;
809		if (*cp++ == '\n')
810			SCREWUP("unexpected <newline>");
811		do {
812			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
813				SCREWUP("lost connection");
814			*cp++ = ch;
815		} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
816		*cp = 0;
817		if (verbose_mode)
818			fprintf(stderr, "Sink: %s", buf);
819
820		if (buf[0] == '\01' || buf[0] == '\02') {
821			if (iamremote == 0)
822				(void) atomicio(vwrite, STDERR_FILENO,
823				    buf + 1, strlen(buf + 1));
824			if (buf[0] == '\02')
825				exit(1);
826			++errs;
827			continue;
828		}
829		if (buf[0] == 'E') {
830			(void) atomicio(vwrite, remout, "", 1);
831			return;
832		}
833		if (ch == '\n')
834			*--cp = 0;
835
836		cp = buf;
837		if (*cp == 'T') {
838			setimes++;
839			cp++;
840			mtime.tv_sec = strtol(cp, &cp, 10);
841			if (!cp || *cp++ != ' ')
842				SCREWUP("mtime.sec not delimited");
843			mtime.tv_usec = strtol(cp, &cp, 10);
844			if (!cp || *cp++ != ' ')
845				SCREWUP("mtime.usec not delimited");
846			atime.tv_sec = strtol(cp, &cp, 10);
847			if (!cp || *cp++ != ' ')
848				SCREWUP("atime.sec not delimited");
849			atime.tv_usec = strtol(cp, &cp, 10);
850			if (!cp || *cp++ != '\0')
851				SCREWUP("atime.usec not delimited");
852			(void) atomicio(vwrite, remout, "", 1);
853			continue;
854		}
855		if (*cp != 'C' && *cp != 'D') {
856			/*
857			 * Check for the case "rcp remote:foo\* local:bar".
858			 * In this case, the line "No match." can be returned
859			 * by the shell before the rcp command on the remote is
860			 * executed so the ^Aerror_message convention isn't
861			 * followed.
862			 */
863			if (first) {
864				run_err("%s", cp);
865				exit(1);
866			}
867			SCREWUP("expected control record");
868		}
869		mode = 0;
870		for (++cp; cp < buf + 5; cp++) {
871			if (*cp < '0' || *cp > '7')
872				SCREWUP("bad mode");
873			mode = (mode << 3) | (*cp - '0');
874		}
875		if (*cp++ != ' ')
876			SCREWUP("mode not delimited");
877
878		for (size = 0; isdigit(*cp);)
879			size = size * 10 + (*cp++ - '0');
880		if (*cp++ != ' ')
881			SCREWUP("size not delimited");
882		if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
883			run_err("error: unexpected filename: %s", cp);
884			exit(1);
885		}
886		if (targisdir) {
887			static char *namebuf;
888			static size_t cursize;
889			size_t need;
890
891			need = strlen(targ) + strlen(cp) + 250;
892			if (need > cursize) {
893				if (namebuf)
894					xfree(namebuf);
895				namebuf = xmalloc(need);
896				cursize = need;
897			}
898			(void) snprintf(namebuf, need, "%s%s%s", targ,
899			    strcmp(targ, "/") ? "/" : "", cp);
900			np = namebuf;
901		} else
902			np = targ;
903		curfile = cp;
904		exists = stat(np, &stb) == 0;
905		if (buf[0] == 'D') {
906			int mod_flag = pflag;
907			if (!iamrecursive)
908				SCREWUP("received directory without -r");
909			if (exists) {
910				if (!S_ISDIR(stb.st_mode)) {
911					errno = ENOTDIR;
912					goto bad;
913				}
914				if (pflag)
915					(void) chmod(np, mode);
916			} else {
917				/* Handle copying from a read-only
918				   directory */
919				mod_flag = 1;
920				if (mkdir(np, mode | S_IRWXU) < 0)
921					goto bad;
922			}
923			vect[0] = xstrdup(np);
924			sink(1, vect);
925			if (setimes) {
926				setimes = 0;
927				if (utimes(vect[0], tv) < 0)
928					run_err("%s: set times: %s",
929					    vect[0], strerror(errno));
930			}
931			if (mod_flag)
932				(void) chmod(vect[0], mode);
933			if (vect[0])
934				xfree(vect[0]);
935			continue;
936		}
937		omode = mode;
938		mode |= S_IWRITE;
939		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
940bad:			run_err("%s: %s", np, strerror(errno));
941			continue;
942		}
943		(void) atomicio(vwrite, remout, "", 1);
944		if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
945			(void) close(ofd);
946			continue;
947		}
948		cp = bp->buf;
949		wrerr = NO;
950
951		statbytes = 0;
952		if (showprogress)
953			start_progress_meter(curfile, size, &statbytes);
954		for (count = i = 0; i < size; i += 4096) {
955			amt = 4096;
956			if (i + amt > size)
957				amt = size - i;
958			count += amt;
959			do {
960				j = atomicio(read, remin, cp, amt);
961				if (j == 0) {
962					run_err("%s", j ? strerror(errno) :
963					    "dropped connection");
964					exit(1);
965				}
966				amt -= j;
967				cp += j;
968				statbytes += j;
969			} while (amt > 0);
970
971			if (limit_rate)
972				bwlimit(4096);
973
974			if (count == bp->cnt) {
975				/* Keep reading so we stay sync'd up. */
976				if (wrerr == NO) {
977					if (atomicio(vwrite, ofd, bp->buf,
978					    count) != count) {
979						wrerr = YES;
980						wrerrno = errno;
981					}
982				}
983				count = 0;
984				cp = bp->buf;
985			}
986		}
987		if (showprogress)
988			stop_progress_meter();
989		if (count != 0 && wrerr == NO &&
990		    atomicio(vwrite, ofd, bp->buf, count) != count) {
991			wrerr = YES;
992			wrerrno = errno;
993		}
994		if (wrerr == NO && ftruncate(ofd, size) != 0) {
995			run_err("%s: truncate: %s", np, strerror(errno));
996			wrerr = DISPLAYED;
997		}
998		if (pflag) {
999			if (exists || omode != mode)
1000#ifdef HAVE_FCHMOD
1001				if (fchmod(ofd, omode)) {
1002#else /* HAVE_FCHMOD */
1003				if (chmod(np, omode)) {
1004#endif /* HAVE_FCHMOD */
1005					run_err("%s: set mode: %s",
1006					    np, strerror(errno));
1007					wrerr = DISPLAYED;
1008				}
1009		} else {
1010			if (!exists && omode != mode)
1011#ifdef HAVE_FCHMOD
1012				if (fchmod(ofd, omode & ~mask)) {
1013#else /* HAVE_FCHMOD */
1014				if (chmod(np, omode & ~mask)) {
1015#endif /* HAVE_FCHMOD */
1016					run_err("%s: set mode: %s",
1017					    np, strerror(errno));
1018					wrerr = DISPLAYED;
1019				}
1020		}
1021		if (close(ofd) == -1) {
1022			wrerr = YES;
1023			wrerrno = errno;
1024		}
1025		(void) response();
1026		if (setimes && wrerr == NO) {
1027			setimes = 0;
1028			if (utimes(np, tv) < 0) {
1029				run_err("%s: set times: %s",
1030				    np, strerror(errno));
1031				wrerr = DISPLAYED;
1032			}
1033		}
1034		switch (wrerr) {
1035		case YES:
1036			run_err("%s: %s", np, strerror(wrerrno));
1037			break;
1038		case NO:
1039			(void) atomicio(vwrite, remout, "", 1);
1040			break;
1041		case DISPLAYED:
1042			break;
1043		}
1044	}
1045screwup:
1046	run_err("protocol error: %s", why);
1047	exit(1);
1048}
1049
1050int
1051response(void)
1052{
1053	char ch, *cp, resp, rbuf[2048];
1054
1055	if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1056		lostconn(0);
1057
1058	cp = rbuf;
1059	switch (resp) {
1060	case 0:		/* ok */
1061		return (0);
1062	default:
1063		*cp++ = resp;
1064		/* FALLTHROUGH */
1065	case 1:		/* error, followed by error msg */
1066	case 2:		/* fatal error, "" */
1067		do {
1068			if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1069				lostconn(0);
1070			*cp++ = ch;
1071		} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1072
1073		if (!iamremote)
1074			(void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1075		++errs;
1076		if (resp == 1)
1077			return (-1);
1078		exit(1);
1079	}
1080	/* NOTREACHED */
1081}
1082
1083void
1084usage(void)
1085{
1086	(void) fprintf(stderr,
1087	    "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1088	    "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1089	    "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1090	exit(1);
1091}
1092
1093void
1094run_err(const char *fmt,...)
1095{
1096	static FILE *fp;
1097	va_list ap;
1098
1099	++errs;
1100	if (fp == NULL && !(fp = fdopen(remout, "w")))
1101		return;
1102	(void) fprintf(fp, "%c", 0x01);
1103	(void) fprintf(fp, "scp: ");
1104	va_start(ap, fmt);
1105	(void) vfprintf(fp, fmt, ap);
1106	va_end(ap);
1107	(void) fprintf(fp, "\n");
1108	(void) fflush(fp);
1109
1110	if (!iamremote) {
1111		va_start(ap, fmt);
1112		vfprintf(stderr, fmt, ap);
1113		va_end(ap);
1114		fprintf(stderr, "\n");
1115	}
1116}
1117
1118void
1119verifydir(char *cp)
1120{
1121	struct stat stb;
1122
1123	if (!stat(cp, &stb)) {
1124		if (S_ISDIR(stb.st_mode))
1125			return;
1126		errno = ENOTDIR;
1127	}
1128	run_err("%s: %s", cp, strerror(errno));
1129	killchild(0);
1130}
1131
1132int
1133okname(char *cp0)
1134{
1135	int c;
1136	char *cp;
1137
1138	cp = cp0;
1139	do {
1140		c = (int)*cp;
1141		if (c & 0200)
1142			goto bad;
1143		if (!isalpha(c) && !isdigit(c)) {
1144			switch (c) {
1145			case '\'':
1146			case '"':
1147			case '`':
1148			case ' ':
1149			case '#':
1150				goto bad;
1151			default:
1152				break;
1153			}
1154		}
1155	} while (*++cp);
1156	return (1);
1157
1158bad:	fprintf(stderr, "%s: invalid user name\n", cp0);
1159	return (0);
1160}
1161
1162BUF *
1163allocbuf(BUF *bp, int fd, int blksize)
1164{
1165	size_t size;
1166#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1167	struct stat stb;
1168
1169	if (fstat(fd, &stb) < 0) {
1170		run_err("fstat: %s", strerror(errno));
1171		return (0);
1172	}
1173	size = roundup(stb.st_blksize, blksize);
1174	if (size == 0)
1175		size = blksize;
1176#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1177	size = blksize;
1178#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1179	if (bp->cnt >= size)
1180		return (bp);
1181	if (bp->buf == NULL)
1182		bp->buf = xmalloc(size);
1183	else
1184		bp->buf = xrealloc(bp->buf, size);
1185	memset(bp->buf, 0, size);
1186	bp->cnt = size;
1187	return (bp);
1188}
1189
1190void
1191lostconn(int signo)
1192{
1193	if (!iamremote)
1194		write(STDERR_FILENO, "lost connection\n", 16);
1195	if (signo)
1196		_exit(1);
1197	else
1198		exit(1);
1199}
1200