rcp.c revision 46057 
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. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char const copyright[] =
36"@(#) Copyright (c) 1983, 1990, 1992, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)rcp.c	8.2 (Berkeley) 4/2/94";
43#endif
44static const char rcsid[] =
45	"$Id: rcp.c,v 1.21 1998/10/09 06:31:45 markm Exp $";
46#endif /* not lint */
47
48#include <sys/param.h>
49#include <sys/stat.h>
50#include <sys/time.h>
51#include <sys/socket.h>
52#include <netinet/in.h>
53#include <netinet/in_systm.h>
54#include <netinet/ip.h>
55
56#include <ctype.h>
57#include <dirent.h>
58#include <err.h>
59#include <errno.h>
60#include <fcntl.h>
61#include <netdb.h>
62#include <pwd.h>
63#include <signal.h>
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67#include <string.h>
68#include <unistd.h>
69#include <libutil.h>
70
71#include "pathnames.h"
72#include "extern.h"
73
74#ifdef KERBEROS
75#include <des.h>
76#include <krb.h>
77
78char	dst_realm_buf[REALM_SZ];
79char	*dest_realm = NULL;
80int	use_kerberos = 1;
81CREDENTIALS 	cred;
82Key_schedule	schedule;
83extern	char	*krb_realmofhost();
84#ifdef CRYPT
85int	doencrypt = 0;
86#define	OPTIONS	"dfKk:prtx"
87#else
88#define	OPTIONS	"dfKk:prt"
89#endif
90#else
91#define	OPTIONS "dfprt"
92#endif
93
94struct passwd *pwd;
95u_short	port;
96uid_t	userid;
97int errs, rem;
98int pflag, iamremote, iamrecursive, targetshouldbedirectory;
99
100static int argc_copy;
101static char **argv_copy;
102
103#define	CMDNEEDS	64
104char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
105
106#ifdef KERBEROS
107int	 kerberos __P((char **, char *, char *, char *));
108void	 oldw __P((const char *, ...));
109#endif
110int	 response __P((void));
111void	 rsource __P((char *, struct stat *));
112void	 sink __P((int, char *[]));
113void	 source __P((int, char *[]));
114void	 tolocal __P((int, char *[]));
115void	 toremote __P((char *, int, char *[]));
116void	 usage __P((void));
117
118int
119main(argc, argv)
120	int argc;
121	char *argv[];
122{
123	struct servent *sp;
124	int ch, fflag, tflag;
125	char *targ, *shell;
126	int i;
127#ifdef KERBEROS
128	char *k;
129#endif
130
131	/*
132	 * Prepare for execing ourselves.
133	 */
134
135	argc_copy = argc + 1;
136	argv_copy = malloc((argc_copy + 1) * sizeof(*argv_copy));
137	if (argv_copy == NULL)
138		err(1, "malloc");
139	argv_copy[0] = argv[0];
140	argv_copy[1] = "-K";
141	for(i = 1; i < argc; ++i) {
142		argv_copy[i + 1] = strdup(argv[i]);
143		if (argv_copy[i + 1] == NULL)
144			errx(1, "strdup: out of memory");
145	}
146	argv_copy[argc + 1] = NULL;
147
148	fflag = tflag = 0;
149	while ((ch = getopt(argc, argv, OPTIONS)) != -1)
150		switch(ch) {			/* User-visible flags. */
151		case 'K':
152#ifdef KERBEROS
153			use_kerberos = 0;
154#endif
155			break;
156#ifdef	KERBEROS
157		case 'k':
158			dest_realm = dst_realm_buf;
159			(void)strncpy(dst_realm_buf, optarg, REALM_SZ - 1);
160			dst_realm_buf[REALM_SZ - 1] = '\0';
161			break;
162#ifdef CRYPT
163		case 'x':
164			doencrypt = 1;
165			/* des_set_key(cred.session, schedule); */
166			break;
167#endif
168#endif
169		case 'p':
170			pflag = 1;
171			break;
172		case 'r':
173			iamrecursive = 1;
174			break;
175						/* Server options. */
176		case 'd':
177			targetshouldbedirectory = 1;
178			break;
179		case 'f':			/* "from" */
180			iamremote = 1;
181			fflag = 1;
182			break;
183		case 't':			/* "to" */
184			iamremote = 1;
185			tflag = 1;
186			break;
187		case '?':
188		default:
189			usage();
190		}
191	argc -= optind;
192	argv += optind;
193
194#ifdef KERBEROS
195	k = auth_getval("auth_list");
196	if (k && !strstr(k, "kerberos"))
197	    use_kerberos = 0;
198	if (use_kerberos) {
199#ifdef CRYPT
200		shell = doencrypt ? "ekshell" : "kshell";
201#else
202		shell = "kshell";
203#endif
204		if ((sp = getservbyname(shell, "tcp")) == NULL) {
205			use_kerberos = 0;
206			oldw("can't get entry for %s/tcp service", shell);
207			sp = getservbyname(shell = "shell", "tcp");
208		}
209	} else
210		sp = getservbyname(shell = "shell", "tcp");
211#else
212	sp = getservbyname(shell = "shell", "tcp");
213#endif
214	if (sp == NULL)
215		errx(1, "%s/tcp: unknown service", shell);
216	port = sp->s_port;
217
218	if ((pwd = getpwuid(userid = getuid())) == NULL)
219		errx(1, "unknown user %d", (int)userid);
220
221	rem = STDIN_FILENO;		/* XXX */
222
223	if (fflag) {			/* Follow "protocol", send data. */
224		(void)response();
225		(void)setuid(userid);
226		source(argc, argv);
227		exit(errs);
228	}
229
230	if (tflag) {			/* Receive data. */
231		(void)setuid(userid);
232		sink(argc, argv);
233		exit(errs);
234	}
235
236	if (argc < 2)
237		usage();
238	if (argc > 2)
239		targetshouldbedirectory = 1;
240
241	rem = -1;
242	/* Command to be executed on remote system using "rsh". */
243#ifdef	KERBEROS
244	(void)snprintf(cmd, sizeof(cmd),
245	    "rcp%s%s%s%s", iamrecursive ? " -r" : "",
246#ifdef CRYPT
247	    (doencrypt && use_kerberos ? " -x" : ""),
248#else
249	    "",
250#endif
251	    pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");
252#else
253	(void)snprintf(cmd, sizeof(cmd), "rcp%s%s%s",
254	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
255	    targetshouldbedirectory ? " -d" : "");
256#endif
257
258	(void)signal(SIGPIPE, lostconn);
259
260	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
261		toremote(targ, argc, argv);
262	else {
263		tolocal(argc, argv);		/* Dest is local host. */
264		if (targetshouldbedirectory)
265			verifydir(argv[argc - 1]);
266	}
267	exit(errs);
268}
269
270void
271toremote(targ, argc, argv)
272	char *targ, *argv[];
273	int argc;
274{
275	int i, len, tos;
276	char *bp, *host, *src, *suser, *thost, *tuser;
277
278	*targ++ = 0;
279	if (*targ == 0)
280		targ = ".";
281
282	if ((thost = strchr(argv[argc - 1], '@'))) {
283		/* user@host */
284		*thost++ = 0;
285		tuser = argv[argc - 1];
286		if (*tuser == '\0')
287			tuser = NULL;
288		else if (!okname(tuser))
289			exit(1);
290	} else {
291		thost = argv[argc - 1];
292		tuser = NULL;
293	}
294
295	for (i = 0; i < argc - 1; i++) {
296		src = colon(argv[i]);
297		if (src) {			/* remote to remote */
298			*src++ = 0;
299			if (*src == 0)
300				src = ".";
301			host = strchr(argv[i], '@');
302			len = strlen(_PATH_RSH) + strlen(argv[i]) +
303			    strlen(src) + (tuser ? strlen(tuser) : 0) +
304			    strlen(thost) + strlen(targ) + CMDNEEDS + 20;
305			if (!(bp = malloc(len)))
306				err(1, NULL);
307			if (host) {
308				*host++ = 0;
309				suser = argv[i];
310				if (*suser == '\0')
311					suser = pwd->pw_name;
312				else if (!okname(suser))
313					continue;
314				(void)snprintf(bp, len,
315				    "%s %s -l %s -n %s %s '%s%s%s:%s'",
316				    _PATH_RSH, host, suser, cmd, src,
317				    tuser ? tuser : "", tuser ? "@" : "",
318				    thost, targ);
319			} else
320				(void)snprintf(bp, len,
321				    "exec %s %s -n %s %s '%s%s%s:%s'",
322				    _PATH_RSH, argv[i], cmd, src,
323				    tuser ? tuser : "", tuser ? "@" : "",
324				    thost, targ);
325			(void)susystem(bp, userid);
326			(void)free(bp);
327		} else {			/* local to remote */
328			if (rem == -1) {
329				len = strlen(targ) + CMDNEEDS + 20;
330				if (!(bp = malloc(len)))
331					err(1, NULL);
332				(void)snprintf(bp, len, "%s -t %s", cmd, targ);
333				host = thost;
334#ifdef KERBEROS
335				if (use_kerberos)
336					rem = kerberos(&host, bp,
337					    pwd->pw_name,
338					    tuser ? tuser : pwd->pw_name);
339				else
340#endif
341					rem = rcmd(&host, port, pwd->pw_name,
342					    tuser ? tuser : pwd->pw_name,
343					    bp, 0);
344				if (rem < 0)
345					exit(1);
346				tos = IPTOS_THROUGHPUT;
347				if (setsockopt(rem, IPPROTO_IP, IP_TOS,
348				    &tos, sizeof(int)) < 0)
349					warn("TOS (ignored)");
350				if (response() < 0)
351					exit(1);
352				(void)free(bp);
353				(void)setuid(userid);
354			}
355			source(1, argv+i);
356		}
357	}
358}
359
360void
361tolocal(argc, argv)
362	int argc;
363	char *argv[];
364{
365	int i, len, tos;
366	char *bp, *host, *src, *suser;
367
368	for (i = 0; i < argc - 1; i++) {
369		if (!(src = colon(argv[i]))) {		/* Local to local. */
370			len = strlen(_PATH_CP) + strlen(argv[i]) +
371			    strlen(argv[argc - 1]) + 20;
372			if (!(bp = malloc(len)))
373				err(1, NULL);
374			(void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
375			    iamrecursive ? " -PR" : "", pflag ? " -p" : "",
376			    argv[i], argv[argc - 1]);
377			if (susystem(bp, userid))
378				++errs;
379			(void)free(bp);
380			continue;
381		}
382		*src++ = 0;
383		if (*src == 0)
384			src = ".";
385		if ((host = strchr(argv[i], '@')) == NULL) {
386			host = argv[i];
387			suser = pwd->pw_name;
388		} else {
389			*host++ = 0;
390			suser = argv[i];
391			if (*suser == '\0')
392				suser = pwd->pw_name;
393			else if (!okname(suser))
394				continue;
395		}
396		len = strlen(src) + CMDNEEDS + 20;
397		if ((bp = malloc(len)) == NULL)
398			err(1, NULL);
399		(void)snprintf(bp, len, "%s -f %s", cmd, src);
400		rem =
401#ifdef KERBEROS
402		    use_kerberos ?
403			kerberos(&host, bp, pwd->pw_name, suser) :
404#endif
405			rcmd(&host, port, pwd->pw_name, suser, bp, 0);
406		(void)free(bp);
407		if (rem < 0) {
408			++errs;
409			continue;
410		}
411		(void)seteuid(userid);
412		tos = IPTOS_THROUGHPUT;
413		if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
414			warn("TOS (ignored)");
415		sink(1, argv + argc - 1);
416		(void)seteuid(0);
417		(void)close(rem);
418		rem = -1;
419	}
420}
421
422void
423source(argc, argv)
424	int argc;
425	char *argv[];
426{
427	struct stat stb;
428	static BUF buffer;
429	BUF *bp;
430	off_t i;
431	int amt, fd, haderr, indx, result;
432	char *last, *name, buf[BUFSIZ];
433
434	for (indx = 0; indx < argc; ++indx) {
435                name = argv[indx];
436		if ((fd = open(name, O_RDONLY, 0)) < 0)
437			goto syserr;
438		if (fstat(fd, &stb)) {
439syserr:			run_err("%s: %s", name, strerror(errno));
440			goto next;
441		}
442		switch (stb.st_mode & S_IFMT) {
443		case S_IFREG:
444			break;
445		case S_IFDIR:
446			if (iamrecursive) {
447				rsource(name, &stb);
448				goto next;
449			}
450			/* FALLTHROUGH */
451		default:
452			run_err("%s: not a regular file", name);
453			goto next;
454		}
455		if ((last = strrchr(name, '/')) == NULL)
456			last = name;
457		else
458			++last;
459		if (pflag) {
460			/*
461			 * Make it compatible with possible future
462			 * versions expecting microseconds.
463			 */
464			(void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
465			    (long)stb.st_mtimespec.tv_sec,
466			    (long)stb.st_atimespec.tv_sec);
467			(void)write(rem, buf, strlen(buf));
468			if (response() < 0)
469				goto next;
470		}
471#define	MODEMASK	(S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
472		(void)snprintf(buf, sizeof(buf), "C%04o %qd %s\n",
473		    stb.st_mode & MODEMASK, stb.st_size, last);
474		(void)write(rem, buf, strlen(buf));
475		if (response() < 0)
476			goto next;
477		if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
478next:			(void)close(fd);
479			continue;
480		}
481
482		/* Keep writing after an error so that we stay sync'd up. */
483		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
484			amt = bp->cnt;
485			if (i + amt > stb.st_size)
486				amt = stb.st_size - i;
487			if (!haderr) {
488				result = read(fd, bp->buf, amt);
489				if (result != amt)
490					haderr = result >= 0 ? EIO : errno;
491			}
492			if (haderr)
493				(void)write(rem, bp->buf, amt);
494			else {
495				result = write(rem, bp->buf, amt);
496				if (result != amt)
497					haderr = result >= 0 ? EIO : errno;
498			}
499		}
500		if (close(fd) && !haderr)
501			haderr = errno;
502		if (!haderr)
503			(void)write(rem, "", 1);
504		else
505			run_err("%s: %s", name, strerror(haderr));
506		(void)response();
507	}
508}
509
510void
511rsource(name, statp)
512	char *name;
513	struct stat *statp;
514{
515	DIR *dirp;
516	struct dirent *dp;
517	char *last, *vect[1], path[MAXPATHLEN];
518
519	if (!(dirp = opendir(name))) {
520		run_err("%s: %s", name, strerror(errno));
521		return;
522	}
523	last = strrchr(name, '/');
524	if (last == 0)
525		last = name;
526	else
527		last++;
528	if (pflag) {
529		(void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
530		    (long)statp->st_mtimespec.tv_sec,
531		    (long)statp->st_atimespec.tv_sec);
532		(void)write(rem, path, strlen(path));
533		if (response() < 0) {
534			closedir(dirp);
535			return;
536		}
537	}
538	(void)snprintf(path, sizeof(path),
539	    "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
540	(void)write(rem, path, strlen(path));
541	if (response() < 0) {
542		closedir(dirp);
543		return;
544	}
545	while ((dp = readdir(dirp))) {
546		if (dp->d_ino == 0)
547			continue;
548		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
549			continue;
550		if (strlen(name) + 1 + strlen(dp->d_name) >= MAXPATHLEN - 1) {
551			run_err("%s/%s: name too long", name, dp->d_name);
552			continue;
553		}
554		(void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
555		vect[0] = path;
556		source(1, vect);
557	}
558	(void)closedir(dirp);
559	(void)write(rem, "E\n", 2);
560	(void)response();
561}
562
563void
564sink(argc, argv)
565	int argc;
566	char *argv[];
567{
568	static BUF buffer;
569	struct stat stb;
570	struct timeval tv[2];
571	enum { YES, NO, DISPLAYED } wrerr;
572	BUF *bp;
573	off_t i, j, size;
574	int amt, count, exists, first, mask, mode, ofd, omode;
575	int setimes, targisdir, wrerrno = 0;
576	char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ];
577
578#define	atime	tv[0]
579#define	mtime	tv[1]
580#define	SCREWUP(str)	{ why = str; goto screwup; }
581
582	setimes = targisdir = 0;
583	mask = umask(0);
584	if (!pflag)
585		(void)umask(mask);
586	if (argc != 1) {
587		run_err("ambiguous target");
588		exit(1);
589	}
590	targ = *argv;
591	if (targetshouldbedirectory)
592		verifydir(targ);
593	(void)write(rem, "", 1);
594	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
595		targisdir = 1;
596	for (first = 1;; first = 0) {
597		cp = buf;
598		if (read(rem, cp, 1) <= 0)
599			return;
600		if (*cp++ == '\n')
601			SCREWUP("unexpected <newline>");
602		do {
603			if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
604				SCREWUP("lost connection");
605			*cp++ = ch;
606		} while (cp < &buf[BUFSIZ - 1] && ch != '\n');
607		*cp = 0;
608
609		if (buf[0] == '\01' || buf[0] == '\02') {
610			if (iamremote == 0)
611				(void)write(STDERR_FILENO,
612				    buf + 1, strlen(buf + 1));
613			if (buf[0] == '\02')
614				exit(1);
615			++errs;
616			continue;
617		}
618		if (buf[0] == 'E') {
619			(void)write(rem, "", 1);
620			return;
621		}
622
623		if (ch == '\n')
624			*--cp = 0;
625
626		cp = buf;
627		if (*cp == 'T') {
628			setimes++;
629			cp++;
630			mtime.tv_sec = strtol(cp, &cp, 10);
631			if (!cp || *cp++ != ' ')
632				SCREWUP("mtime.sec not delimited");
633			mtime.tv_usec = strtol(cp, &cp, 10);
634			if (!cp || *cp++ != ' ')
635				SCREWUP("mtime.usec not delimited");
636			atime.tv_sec = strtol(cp, &cp, 10);
637			if (!cp || *cp++ != ' ')
638				SCREWUP("atime.sec not delimited");
639			atime.tv_usec = strtol(cp, &cp, 10);
640			if (!cp || *cp++ != '\0')
641				SCREWUP("atime.usec not delimited");
642			(void)write(rem, "", 1);
643			continue;
644		}
645		if (*cp != 'C' && *cp != 'D') {
646			/*
647			 * Check for the case "rcp remote:foo\* local:bar".
648			 * In this case, the line "No match." can be returned
649			 * by the shell before the rcp command on the remote is
650			 * executed so the ^Aerror_message convention isn't
651			 * followed.
652			 */
653			if (first) {
654				run_err("%s", cp);
655				exit(1);
656			}
657			SCREWUP("expected control record");
658		}
659		mode = 0;
660		for (++cp; cp < buf + 5; cp++) {
661			if (*cp < '0' || *cp > '7')
662				SCREWUP("bad mode");
663			mode = (mode << 3) | (*cp - '0');
664		}
665		if (*cp++ != ' ')
666			SCREWUP("mode not delimited");
667
668		for (size = 0; isdigit(*cp);)
669			size = size * 10 + (*cp++ - '0');
670		if (*cp++ != ' ')
671			SCREWUP("size not delimited");
672		if (targisdir) {
673			static char *namebuf;
674			static int cursize;
675			size_t need;
676
677			need = strlen(targ) + strlen(cp) + 250;
678			if (need > cursize) {
679				if (!(namebuf = malloc(need)))
680					run_err("%s", strerror(errno));
681			}
682			(void)snprintf(namebuf, need, "%s%s%s", targ,
683			    *targ ? "/" : "", cp);
684			np = namebuf;
685		} else
686			np = targ;
687		exists = stat(np, &stb) == 0;
688		if (buf[0] == 'D') {
689			int mod_flag = pflag;
690			if (exists) {
691				if (!S_ISDIR(stb.st_mode)) {
692					errno = ENOTDIR;
693					goto bad;
694				}
695				if (pflag)
696					(void)chmod(np, mode);
697			} else {
698				/* Handle copying from a read-only directory */
699				mod_flag = 1;
700				if (mkdir(np, mode | S_IRWXU) < 0)
701					goto bad;
702			}
703			vect[0] = np;
704			sink(1, vect);
705			if (setimes) {
706				setimes = 0;
707				if (utimes(np, tv) < 0)
708				    run_err("%s: set times: %s",
709					np, strerror(errno));
710			}
711			if (mod_flag)
712				(void)chmod(np, mode);
713			continue;
714		}
715		omode = mode;
716		mode |= S_IWRITE;
717		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
718bad:			run_err("%s: %s", np, strerror(errno));
719			continue;
720		}
721		(void)write(rem, "", 1);
722		if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
723			(void)close(ofd);
724			continue;
725		}
726		cp = bp->buf;
727		wrerr = NO;
728		for (count = i = 0; i < size; i += BUFSIZ) {
729			amt = BUFSIZ;
730			if (i + amt > size)
731				amt = size - i;
732			count += amt;
733			do {
734				j = read(rem, cp, amt);
735				if (j <= 0) {
736					run_err("%s", j ? strerror(errno) :
737					    "dropped connection");
738					exit(1);
739				}
740				amt -= j;
741				cp += j;
742			} while (amt > 0);
743			if (count == bp->cnt) {
744				/* Keep reading so we stay sync'd up. */
745				if (wrerr == NO) {
746					j = write(ofd, bp->buf, count);
747					if (j != count) {
748						wrerr = YES;
749						wrerrno = j >= 0 ? EIO : errno;
750					}
751				}
752				count = 0;
753				cp = bp->buf;
754			}
755		}
756		if (count != 0 && wrerr == NO &&
757		    (j = write(ofd, bp->buf, count)) != count) {
758			wrerr = YES;
759			wrerrno = j >= 0 ? EIO : errno;
760		}
761		if (ftruncate(ofd, size)) {
762			run_err("%s: truncate: %s", np, strerror(errno));
763			wrerr = DISPLAYED;
764		}
765		if (pflag) {
766			if (exists || omode != mode)
767				if (fchmod(ofd, omode))
768					run_err("%s: set mode: %s",
769					    np, strerror(errno));
770		} else {
771			if (!exists && omode != mode)
772				if (fchmod(ofd, omode & ~mask))
773					run_err("%s: set mode: %s",
774					    np, strerror(errno));
775		}
776		(void)close(ofd);
777		(void)response();
778		if (setimes && wrerr == NO) {
779			setimes = 0;
780			if (utimes(np, tv) < 0) {
781				run_err("%s: set times: %s",
782				    np, strerror(errno));
783				wrerr = DISPLAYED;
784			}
785		}
786		switch(wrerr) {
787		case YES:
788			run_err("%s: %s", np, strerror(wrerrno));
789			break;
790		case NO:
791			(void)write(rem, "", 1);
792			break;
793		case DISPLAYED:
794			break;
795		}
796	}
797screwup:
798	run_err("protocol error: %s", why);
799	exit(1);
800}
801
802#ifdef KERBEROS
803int
804kerberos(host, bp, locuser, user)
805	char **host, *bp, *locuser, *user;
806{
807	if (use_kerberos) {
808		setuid(getuid());
809		rem = KSUCCESS;
810		errno = 0;
811		if (dest_realm == NULL)
812			dest_realm = krb_realmofhost(*host);
813		rem =
814#ifdef CRYPT
815		    doencrypt ?
816			krcmd_mutual(host,
817			    port, user, bp, 0, dest_realm, &cred, schedule) :
818#endif
819			krcmd(host, port, user, bp, 0, dest_realm);
820
821		if (rem < 0) {
822			if (errno == ECONNREFUSED)
823			    oldw("remote host doesn't support Kerberos");
824			else if (errno == ENOENT)
825			    oldw("can't provide Kerberos authentication data");
826			execv(_PATH_RCP, argv_copy);
827		}
828	} else {
829#ifdef CRYPT
830		if (doencrypt)
831			errx(1,
832			   "the -x option requires Kerberos authentication");
833#endif
834		rem = rcmd(host, port, locuser, user, bp, 0);
835	}
836	return (rem);
837}
838#endif /* KERBEROS */
839
840int
841response()
842{
843	char ch, *cp, resp, rbuf[BUFSIZ];
844
845	if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
846		lostconn(0);
847
848	cp = rbuf;
849	switch(resp) {
850	case 0:				/* ok */
851		return (0);
852	default:
853		*cp++ = resp;
854		/* FALLTHROUGH */
855	case 1:				/* error, followed by error msg */
856	case 2:				/* fatal error, "" */
857		do {
858			if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
859				lostconn(0);
860			*cp++ = ch;
861		} while (cp < &rbuf[BUFSIZ] && ch != '\n');
862
863		if (!iamremote)
864			(void)write(STDERR_FILENO, rbuf, cp - rbuf);
865		++errs;
866		if (resp == 1)
867			return (-1);
868		exit(1);
869	}
870	/* NOTREACHED */
871}
872
873void
874usage()
875{
876#ifdef KERBEROS
877#ifdef CRYPT
878	(void)fprintf(stderr, "%s\n%s\n",
879	    "usage: rcp [-Kpx] [-k realm] f1 f2",
880	    "       rcp [-Kprx] [-k realm] f1 ... fn directory");
881#else
882	(void)fprintf(stderr, "%s\n%s\n",
883	    "usage: rcp [-Kp] [-k realm] f1 f2",
884	    "       rcp [-Kpr] [-k realm] f1 ... fn directory");
885#endif
886#else
887	(void)fprintf(stderr, "%s\n%s\n",
888	    "usage: rcp [-p] f1 f2",
889	    "       rcp [-pr] f1 ... fn directory");
890#endif
891	exit(1);
892}
893
894#if __STDC__
895#include <stdarg.h>
896#else
897#include <varargs.h>
898#endif
899
900#ifdef KERBEROS
901void
902#if __STDC__
903oldw(const char *fmt, ...)
904#else
905oldw(fmt, va_alist)
906	char *fmt;
907        va_dcl
908#endif
909{
910	va_list ap;
911#if __STDC__
912	va_start(ap, fmt);
913#else
914	va_start(ap);
915#endif
916	(void)fprintf(stderr, "rcp: ");
917	(void)vfprintf(stderr, fmt, ap);
918	(void)fprintf(stderr, ", using standard rcp\n");
919	va_end(ap);
920}
921#endif
922
923void
924#if __STDC__
925run_err(const char *fmt, ...)
926#else
927run_err(fmt, va_alist)
928	char *fmt;
929        va_dcl
930#endif
931{
932	static FILE *fp;
933	va_list ap;
934#if __STDC__
935	va_start(ap, fmt);
936#else
937	va_start(ap);
938#endif
939
940	++errs;
941	if (fp == NULL && !(fp = fdopen(rem, "w")))
942		return;
943	(void)fprintf(fp, "%c", 0x01);
944	(void)fprintf(fp, "rcp: ");
945	(void)vfprintf(fp, fmt, ap);
946	(void)fprintf(fp, "\n");
947	(void)fflush(fp);
948
949	if (!iamremote)
950		vwarnx(fmt, ap);
951
952	va_end(ap);
953}
954