/crypto/heimdal/appl/rcp/rcp.c

  1/*
  2 * Copyright (c) 1983, 1990, 1992, 1993
  3 *	The Regents of the University of California.  All rights reserved.
  4 *
  5 * Redistribution and use in source and binary forms, with or without
  6 * modification, are permitted provided that the following conditions
  7 * are met:
  8 * 1. Redistributions of source code must retain the above copyright
  9 *    notice, this list of conditions and the following disclaimer.
 10 * 2. Redistributions in binary form must reproduce the above copyright
 11 *    notice, this list of conditions and the following disclaimer in the
 12 *    documentation and/or other materials provided with the distribution.
 13 * 3. Neither the name of the University nor the names of its contributors
 14 *    may be used to endorse or promote products derived from this software
 15 *    without specific prior written permission.
 16 *
 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 27 * SUCH DAMAGE.
 28 */
 29
 30#include "rcp_locl.h"
 31#include <getarg.h>
 32
 33#define RSH_PROGRAM "rsh"
 34
 35struct  passwd *pwd;
 36uid_t	userid;
 37int     errs, remin, remout;
 38int     pflag, iamremote, iamrecursive, targetshouldbedirectory;
 39int     doencrypt, noencrypt;
 40int     usebroken, usekrb4, usekrb5, forwardtkt;
 41char    *port;
 42int     eflag = 0;
 43
 44#define	CMDNEEDS	64
 45char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
 46
 47int	 response (void);
 48void	 rsource (char *, struct stat *);
 49void	 sink (int, char *[]);
 50void	 source (int, char *[]);
 51void	 tolocal (int, char *[]);
 52void	 toremote (char *, int, char *[]);
 53
 54int      do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 55
 56static int fflag, tflag;
 57
 58static int version_flag, help_flag;
 59
 60struct getargs args[] = {
 61    { NULL,	'4', arg_flag,		&usekrb4,	"use Kerberos 4 authentication" },
 62    { NULL,	'5', arg_flag,		&usekrb5,	"use Kerberos 5 authentication" },
 63    { NULL,	'F', arg_flag,		&forwardtkt,	"forward credentials" },
 64    { NULL,	'K', arg_flag,		&usebroken,	"use BSD authentication" },
 65    { NULL,	'P', arg_string,	&port,		"non-default port", "port" },
 66    { NULL,	'p', arg_flag,		&pflag,	"preserve file permissions" },
 67    { NULL,	'r', arg_flag,		&iamrecursive,	"recursive mode" },
 68    { NULL,	'x', arg_flag,		&doencrypt,	"use encryption" },
 69    { NULL,	'z', arg_flag,		&noencrypt,	"don't encrypt" },
 70    { NULL,	'd', arg_flag,		&targetshouldbedirectory },
 71    { NULL,	'e', arg_flag,		&eflag, 	"passed to rsh" },
 72    { NULL,	'f', arg_flag,		&fflag },
 73    { NULL,	't', arg_flag,		&tflag },
 74    { "version", 0,  arg_flag,		&version_flag },
 75    { "help",	 0,  arg_flag,		&help_flag }
 76};
 77
 78static void
 79usage (int ret)
 80{
 81    arg_printusage (args,
 82		    sizeof(args) / sizeof(args[0]),
 83		    NULL,
 84		    "file1 file2|file... directory");
 85    exit (ret);
 86}
 87
 88int
 89main(int argc, char **argv)
 90{
 91	char *targ;
 92	int optind = 0;
 93
 94	setprogname(argv[0]);
 95	if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
 96		    &optind))
 97	    usage (1);
 98	if(help_flag)
 99	    usage(0);
100	if (version_flag) {
101	    print_version (NULL);
102	    return 0;
103	}
104
105	iamremote = (fflag || tflag);
106
107	argc -= optind;
108	argv += optind;
109
110	if ((pwd = getpwuid(userid = getuid())) == NULL)
111		errx(1, "unknown user %d", (int)userid);
112
113	remin = STDIN_FILENO;		/* XXX */
114	remout = STDOUT_FILENO;
115
116	if (fflag) {			/* Follow "protocol", send data. */
117		(void)response();
118		source(argc, argv);
119		exit(errs);
120	}
121
122	if (tflag) {			/* Receive data. */
123		sink(argc, argv);
124		exit(errs);
125	}
126
127	if (argc < 2)
128	    usage(1);
129	if (argc > 2)
130		targetshouldbedirectory = 1;
131
132	remin = remout = -1;
133	/* Command to be executed on remote system using "rsh". */
134	snprintf(cmd, sizeof(cmd),
135		 "rcp%s%s%s", iamrecursive ? " -r" : "",
136		 pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");
137
138	signal(SIGPIPE, lostconn);
139
140	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
141		toremote(targ, argc, argv);
142	else {
143		tolocal(argc, argv);		/* Dest is local host. */
144		if (targetshouldbedirectory)
145			verifydir(argv[argc - 1]);
146	}
147	exit(errs);
148}
149
150void
151toremote(char *targ, int argc, char **argv)
152{
153	int i;
154	char *bp, *host, *src, *suser, *thost, *tuser;
155
156	*targ++ = 0;
157	if (*targ == 0)
158		targ = ".";
159
160	if ((thost = strchr(argv[argc - 1], '@')) != NULL) {
161		/* user@host */
162		*thost++ = 0;
163		tuser = argv[argc - 1];
164		if (*tuser == '\0')
165			tuser = NULL;
166		else if (!okname(tuser))
167			exit(1);
168	} else {
169		thost = argv[argc - 1];
170		tuser = NULL;
171	}
172	thost = unbracket(thost);
173
174	for (i = 0; i < argc - 1; i++) {
175		src = colon(argv[i]);
176		if (src) {			/* remote to remote */
177			int ret;
178			*src++ = 0;
179			if (*src == 0)
180				src = ".";
181			host = strchr(argv[i], '@');
182			if (host) {
183				*host++ = '\0';
184				host = unbracket(host);
185				suser = argv[i];
186				if (*suser == '\0')
187					suser = pwd->pw_name;
188				else if (!okname(suser))
189					continue;
190				ret = asprintf(&bp,
191				    "%s%s %s -l %s -n %s %s '%s%s%s:%s'",
192					 _PATH_RSH, eflag ? " -e" : "",
193					 host, suser, cmd, src,
194				    tuser ? tuser : "", tuser ? "@" : "",
195				    thost, targ);
196			} else {
197				host = unbracket(argv[i]);
198				ret = asprintf(&bp,
199					 "exec %s%s %s -n %s %s '%s%s%s:%s'",
200					 _PATH_RSH, eflag ? " -e" : "",
201					 host, cmd, src,
202					 tuser ? tuser : "", tuser ? "@" : "",
203					 thost, targ);
204			}
205			if (ret == -1)
206				err (1, "malloc");
207			susystem(bp);
208			free(bp);
209		} else {			/* local to remote */
210			if (remin == -1) {
211				if (asprintf(&bp, "%s -t %s", cmd, targ) == -1)
212					err (1, "malloc");
213				host = thost;
214
215				if (do_cmd(host, tuser, bp, &remin, &remout) < 0)
216					exit(1);
217
218				if (response() < 0)
219					exit(1);
220				free(bp);
221			}
222			source(1, argv+i);
223		}
224	}
225}
226
227void
228tolocal(int argc, char **argv)
229{
230	int i;
231	char *bp, *host, *src, *suser;
232
233	for (i = 0; i < argc - 1; i++) {
234		int ret;
235
236		if (!(src = colon(argv[i]))) {		/* Local to local. */
237			ret = asprintf(&bp, "exec %s%s%s %s %s", _PATH_CP,
238			    iamrecursive ? " -PR" : "", pflag ? " -p" : "",
239			    argv[i], argv[argc - 1]);
240			if (ret == -1)
241				err (1, "malloc");
242			if (susystem(bp))
243				++errs;
244			free(bp);
245			continue;
246		}
247		*src++ = 0;
248		if (*src == 0)
249			src = ".";
250		if ((host = strchr(argv[i], '@')) == NULL) {
251			host = argv[i];
252			suser = pwd->pw_name;
253		} else {
254			*host++ = 0;
255			suser = argv[i];
256			if (*suser == '\0')
257				suser = pwd->pw_name;
258			else if (!okname(suser))
259				continue;
260		}
261		ret = asprintf(&bp, "%s -f %s", cmd, src);
262		if (ret == -1)
263			err (1, "malloc");
264		if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
265			free(bp);
266			++errs;
267			continue;
268		}
269		free(bp);
270		sink(1, argv + argc - 1);
271		close(remin);
272		remin = remout = -1;
273	}
274}
275
276void
277source(int argc, char **argv)
278{
279	struct stat stb;
280	static BUF buffer;
281	BUF *bp;
282	off_t i;
283	off_t amt;
284	int fd, haderr, indx, result;
285	char *last, *name, buf[BUFSIZ];
286
287	for (indx = 0; indx < argc; ++indx) {
288                name = argv[indx];
289		if ((fd = open(name, O_RDONLY, 0)) < 0)
290			goto syserr;
291		if (fstat(fd, &stb)) {
292syserr:			run_err("%s: %s", name, strerror(errno));
293			goto next;
294		}
295		if (S_ISDIR(stb.st_mode) && iamrecursive) {
296			rsource(name, &stb);
297			goto next;
298		} else if (!S_ISREG(stb.st_mode)) {
299			run_err("%s: not a regular file", name);
300			goto next;
301		}
302		if ((last = strrchr(name, '/')) == NULL)
303			last = name;
304		else
305			++last;
306		if (pflag) {
307			/*
308			 * Make it compatible with possible future
309			 * versions expecting microseconds.
310			 */
311			snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
312			    (long)stb.st_mtime,
313			    (long)stb.st_atime);
314			write(remout, buf, strlen(buf));
315			if (response() < 0)
316				goto next;
317		}
318#undef MODEMASK
319#define	MODEMASK	(S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)
320		snprintf(buf, sizeof(buf), "C%04o %lu %s\n",
321			 (unsigned int)(stb.st_mode & MODEMASK),
322			 (unsigned long)stb.st_size,
323			 last);
324		write(remout, buf, strlen(buf));
325		if (response() < 0)
326			goto next;
327		if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
328next:			close(fd);
329			continue;
330		}
331
332		/* Keep writing after an error so that we stay sync'd up. */
333		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
334			amt = bp->cnt;
335			if (i + amt > stb.st_size)
336				amt = stb.st_size - i;
337			if (!haderr) {
338			        result = read(fd, bp->buf, (size_t)amt);
339				if (result != amt)
340					haderr = result >= 0 ? EIO : errno;
341			}
342			if (haderr)
343				write(remout, bp->buf, amt);
344			else {
345			        result = write(remout, bp->buf, (size_t)amt);
346				if (result != amt)
347					haderr = result >= 0 ? EIO : errno;
348			}
349		}
350		if (close(fd) && !haderr)
351			haderr = errno;
352		if (!haderr)
353			write(remout, "", 1);
354		else
355			run_err("%s: %s", name, strerror(haderr));
356		response();
357	}
358}
359
360void
361rsource(char *name, struct stat *statp)
362{
363	DIR *dirp;
364	struct dirent *dp;
365	char *last, *vect[1], path[MAXPATHLEN];
366
367	if (!(dirp = opendir(name))) {
368		run_err("%s: %s", name, strerror(errno));
369		return;
370	}
371	last = strrchr(name, '/');
372	if (last == 0)
373		last = name;
374	else
375		last++;
376	if (pflag) {
377		snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
378		    (long)statp->st_mtime,
379		    (long)statp->st_atime);
380		write(remout, path, strlen(path));
381		if (response() < 0) {
382			closedir(dirp);
383			return;
384		}
385	}
386	snprintf(path, sizeof(path),
387		 "D%04o %d %s\n",
388		 (unsigned int)(statp->st_mode & MODEMASK), 0, last);
389	write(remout, path, strlen(path));
390	if (response() < 0) {
391		closedir(dirp);
392		return;
393	}
394	while ((dp = readdir(dirp)) != NULL) {
395		if (dp->d_ino == 0)
396			continue;
397		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
398			continue;
399		if (strlen(name) + 1 + strlen(dp->d_name) >= MAXPATHLEN - 1) {
400			run_err("%s/%s: name too long", name, dp->d_name);
401			continue;
402		}
403		snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
404		vect[0] = path;
405		source(1, vect);
406	}
407	closedir(dirp);
408	write(remout, "E\n", 2);
409	response();
410}
411
412void
413sink(int argc, char **argv)
414{
415	static BUF buffer;
416	struct stat stb;
417	struct timeval tv[2];
418	enum { YES, NO, DISPLAYED } wrerr;
419	BUF *bp;
420	off_t i, j, size;
421	int amt, count, exists, first, mask, mode, ofd, omode;
422	int setimes, targisdir, wrerrno = 0;
423	char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ];
424
425#define	atime	tv[0]
426#define	mtime	tv[1]
427#define	SCREWUP(str)	{ why = str; goto screwup; }
428
429	setimes = targisdir = 0;
430	mask = umask(0);
431	if (!pflag)
432		umask(mask);
433	if (argc != 1) {
434		run_err("ambiguous target");
435		exit(1);
436	}
437	targ = *argv;
438	if (targetshouldbedirectory)
439		verifydir(targ);
440	write(remout, "", 1);
441	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
442		targisdir = 1;
443	for (first = 1;; first = 0) {
444		cp = buf;
445		if (read(remin, cp, 1) <= 0)
446			return;
447		if (*cp++ == '\n')
448			SCREWUP("unexpected <newline>");
449		do {
450			if (read(remin, &ch, sizeof(ch)) != sizeof(ch))
451				SCREWUP("lost connection");
452			*cp++ = ch;
453		} while (cp < &buf[BUFSIZ - 1] && ch != '\n');
454		*cp = 0;
455
456		if (buf[0] == '\01' || buf[0] == '\02') {
457			if (iamremote == 0)
458				write(STDERR_FILENO,
459				    buf + 1, strlen(buf + 1));
460			if (buf[0] == '\02')
461				exit(1);
462			++errs;
463			continue;
464		}
465		if (buf[0] == 'E') {
466			write(remout, "", 1);
467			return;
468		}
469
470		if (ch == '\n')
471			*--cp = 0;
472
473		cp = buf;
474		if (*cp == 'T') {
475			setimes++;
476			cp++;
477			mtime.tv_sec = strtol(cp, &cp, 10);
478			if (!cp || *cp++ != ' ')
479				SCREWUP("mtime.sec not delimited");
480			mtime.tv_usec = strtol(cp, &cp, 10);
481			if (!cp || *cp++ != ' ')
482				SCREWUP("mtime.usec not delimited");
483			atime.tv_sec = strtol(cp, &cp, 10);
484			if (!cp || *cp++ != ' ')
485				SCREWUP("atime.sec not delimited");
486			atime.tv_usec = strtol(cp, &cp, 10);
487			if (!cp || *cp++ != '\0')
488				SCREWUP("atime.usec not delimited");
489			write(remout, "", 1);
490			continue;
491		}
492		if (*cp != 'C' && *cp != 'D') {
493			/*
494			 * Check for the case "rcp remote:foo\* local:bar".
495			 * In this case, the line "No match." can be returned
496			 * by the shell before the rcp command on the remote is
497			 * executed so the ^Aerror_message convention isn't
498			 * followed.
499			 */
500			if (first) {
501				run_err("%s", cp);
502				exit(1);
503			}
504			SCREWUP("expected control record");
505		}
506		mode = 0;
507		for (++cp; cp < buf + 5; cp++) {
508			if (*cp < '0' || *cp > '7')
509				SCREWUP("bad mode");
510			mode = (mode << 3) | (*cp - '0');
511		}
512		if (*cp++ != ' ')
513			SCREWUP("mode not delimited");
514
515		for (size = 0; isdigit((unsigned char)*cp);)
516			size = size * 10 + (*cp++ - '0');
517		if (*cp++ != ' ')
518			SCREWUP("size not delimited");
519		if (targisdir) {
520			static char *namebuf;
521			static int cursize;
522			size_t need;
523
524			need = strlen(targ) + strlen(cp) + 250;
525			if (need > cursize) {
526				if (!(namebuf = malloc(need)))
527					run_err("%s", strerror(errno));
528			}
529			snprintf(namebuf, need, "%s%s%s", targ,
530			    *targ ? "/" : "", cp);
531			np = namebuf;
532		} else
533			np = targ;
534		exists = stat(np, &stb) == 0;
535		if (buf[0] == 'D') {
536			int mod_flag = pflag;
537			if (exists) {
538				if (!S_ISDIR(stb.st_mode)) {
539					errno = ENOTDIR;
540					goto bad;
541				}
542				if (pflag)
543					chmod(np, mode);
544			} else {
545				/* Handle copying from a read-only directory */
546				mod_flag = 1;
547				if (mkdir(np, mode | S_IRWXU) < 0)
548					goto bad;
549			}
550			vect[0] = np;
551			sink(1, vect);
552			if (setimes) {
553				setimes = 0;
554				if (utimes(np, tv) < 0)
555				    run_err("%s: set times: %s",
556					np, strerror(errno));
557			}
558			if (mod_flag)
559				chmod(np, mode);
560			continue;
561		}
562		omode = mode;
563		mode |= S_IWRITE;
564		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
565bad:			run_err("%s: %s", np, strerror(errno));
566			continue;
567		}
568		write(remout, "", 1);
569		if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
570			close(ofd);
571			continue;
572		}
573		cp = bp->buf;
574		wrerr = NO;
575		for (count = i = 0; i < size; i += BUFSIZ) {
576			amt = BUFSIZ;
577			if (i + amt > size)
578				amt = size - i;
579			count += amt;
580			if((j = net_read(remin, cp, amt)) != amt) {
581			    run_err("%s", j ? strerror(errno) :
582				    "dropped connection");
583			    exit(1);
584			}
585			amt -= j;
586			cp += j;
587			if (count == bp->cnt) {
588				/* Keep reading so we stay sync'd up. */
589				if (wrerr == NO) {
590					j = write(ofd, bp->buf, (size_t)count);
591					if (j != count) {
592						wrerr = YES;
593						wrerrno = j >= 0 ? EIO : errno;
594					}
595				}
596				count = 0;
597				cp = bp->buf;
598			}
599		}
600		if (count != 0 && wrerr == NO &&
601		    (j = write(ofd, bp->buf, (size_t)count)) != count) {
602			wrerr = YES;
603			wrerrno = j >= 0 ? EIO : errno;
604		}
605		if (ftruncate(ofd, size)) {
606			run_err("%s: truncate: %s", np, strerror(errno));
607			wrerr = DISPLAYED;
608		}
609		if (pflag) {
610			if (exists || omode != mode)
611				if (fchmod(ofd, omode))
612					run_err("%s: set mode: %s",
613					    np, strerror(errno));
614		} else {
615			if (!exists && omode != mode)
616				if (fchmod(ofd, omode & ~mask))
617					run_err("%s: set mode: %s",
618					    np, strerror(errno));
619		}
620		close(ofd);
621		response();
622		if (setimes && wrerr == NO) {
623			setimes = 0;
624			if (utimes(np, tv) < 0) {
625				run_err("%s: set times: %s",
626				    np, strerror(errno));
627				wrerr = DISPLAYED;
628			}
629		}
630		switch(wrerr) {
631		case YES:
632			run_err("%s: %s", np, strerror(wrerrno));
633			break;
634		case NO:
635			write(remout, "", 1);
636			break;
637		case DISPLAYED:
638			break;
639		}
640	}
641screwup:
642	run_err("protocol error: %s", why);
643	exit(1);
644}
645
646int
647response(void)
648{
649	char ch, *cp, resp, rbuf[BUFSIZ];
650
651	if (read(remin, &resp, sizeof(resp)) != sizeof(resp))
652		lostconn(0);
653
654	cp = rbuf;
655	switch(resp) {
656	case 0:				/* ok */
657		return (0);
658	default:
659		*cp++ = resp;
660		/* FALLTHROUGH */
661	case 1:				/* error, followed by error msg */
662	case 2:				/* fatal error, "" */
663		do {
664			if (read(remin, &ch, sizeof(ch)) != sizeof(ch))
665				lostconn(0);
666			*cp++ = ch;
667		} while (cp < &rbuf[BUFSIZ] && ch != '\n');
668
669		if (!iamremote)
670			write(STDERR_FILENO, rbuf, cp - rbuf);
671		++errs;
672		if (resp == 1)
673			return (-1);
674		exit(1);
675	}
676	/* NOTREACHED */
677}
678
679#include <stdarg.h>
680
681void
682run_err(const char *fmt, ...)
683{
684	static FILE *fp;
685	va_list ap;
686
687	++errs;
688	if (fp == NULL && !(fp = fdopen(remout, "w")))
689		return;
690	va_start(ap, fmt);
691	fprintf(fp, "%c", 0x01);
692	fprintf(fp, "rcp: ");
693	vfprintf(fp, fmt, ap);
694	fprintf(fp, "\n");
695	fflush(fp);
696	va_end(ap);
697
698	if (!iamremote) {
699	    va_start(ap, fmt);
700	    vwarnx(fmt, ap);
701	    va_end(ap);
702	}
703}
704
705/*
706 * This function executes the given command as the specified user on the
707 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
708 * assigns the input and output file descriptors on success.
709 *
710 * If it cannot create necessary pipes it exits with error message.
711 */
712
713int
714do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
715{
716	int pin[2], pout[2], reserved[2];
717
718	/*
719	 * Reserve two descriptors so that the real pipes won't get
720	 * descriptors 0 and 1 because that will screw up dup2 below.
721	 */
722	pipe(reserved);
723
724	/* Create a socket pair for communicating with rsh. */
725	if (pipe(pin) < 0) {
726		perror("pipe");
727		exit(255);
728	}
729	if (pipe(pout) < 0) {
730		perror("pipe");
731		exit(255);
732	}
733
734	/* Free the reserved descriptors. */
735	close(reserved[0]);
736	close(reserved[1]);
737
738	/* For a child to execute the command on the remote host using rsh. */
739	if (fork() == 0) {
740		char *args[100];
741		unsigned int i;
742
743		/* Child. */
744		close(pin[1]);
745		close(pout[0]);
746		dup2(pin[0], 0);
747		dup2(pout[1], 1);
748		close(pin[0]);
749		close(pout[1]);
750
751		i = 0;
752		args[i++] = RSH_PROGRAM;
753		if (usekrb4)
754			args[i++] = "-4";
755		if (usekrb5)
756			args[i++] = "-5";
757		if (usebroken)
758			args[i++] = "-K";
759		if (doencrypt)
760			args[i++] = "-x";
761		if (forwardtkt)
762			args[i++] = "-F";
763		if (noencrypt)
764			args[i++] = "-z";
765		if (port != NULL) {
766			args[i++] = "-p";
767			args[i++] = port;
768		}
769		if (eflag)
770		    args[i++] = "-e";
771		if (remuser != NULL) {
772			args[i++] = "-l";
773			args[i++] = remuser;
774		}
775		args[i++] = host;
776		args[i++] = cmd;
777		args[i++] = NULL;
778
779		execvp(RSH_PROGRAM, args);
780		perror(RSH_PROGRAM);
781		exit(1);
782	}
783	/* Parent.  Close the other side, and return the local side. */
784	close(pin[0]);
785	*fdout = pin[1];
786	close(pout[1]);
787	*fdin = pout[0];
788	return 0;
789}