source: heimdal/trunk/appl/rcp/rcp.c

Last change on this file was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 18.0 KB
Line 
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}
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