rcp.c revision 114433 
1/*
2 * Copyright (c) 1983, 1990, 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 2002 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 *    must display the following acknowledgement:
22 *	This product includes software developed by the University of
23 *	California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41#if 0
42#ifndef lint
43static char const copyright[] =
44"@(#) Copyright (c) 1983, 1990, 1992, 1993\n\
45	The Regents of the University of California.  All rights reserved.\n";
46#endif /* not lint */
47
48#ifndef lint
49static char sccsid[] = "@(#)rcp.c	8.2 (Berkeley) 4/2/94";
50#endif /* not lint */
51#endif
52#include <sys/cdefs.h>
53__FBSDID("$FreeBSD: head/bin/rcp/rcp.c 114433 2003-05-01 16:58:57Z obrien $");
54
55#include <sys/param.h>
56#include <sys/stat.h>
57#include <sys/time.h>
58#include <sys/socket.h>
59#include <netinet/in.h>
60#include <netinet/in_systm.h>
61#include <netinet/ip.h>
62
63#include <ctype.h>
64#include <dirent.h>
65#include <err.h>
66#include <errno.h>
67#include <fcntl.h>
68#include <libutil.h>
69#include <limits.h>
70#include <netdb.h>
71#include <paths.h>
72#include <pwd.h>
73#include <signal.h>
74#include <stdint.h>
75#include <stdio.h>
76#include <stdlib.h>
77#include <string.h>
78#include <string.h>
79#include <unistd.h>
80
81#include "extern.h"
82
83#define	OPTIONS "46dfprt"
84
85struct passwd *pwd;
86u_short	port;
87uid_t	userid;
88int errs, rem;
89int pflag, iamremote, iamrecursive, targetshouldbedirectory;
90int family = PF_UNSPEC;
91
92static int argc_copy;
93static char **argv_copy;
94
95#define	CMDNEEDS	64
96char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */
97
98int	 response(void);
99void	 rsource(char *, struct stat *);
100void	 run_err(const char *, ...) __printflike(1, 2);
101void	 sink(int, char *[]);
102void	 source(int, char *[]);
103void	 tolocal(int, char *[]);
104void	 toremote(char *, int, char *[]);
105void	 usage(void);
106
107int
108main(int argc, char *argv[])
109{
110	struct servent *sp;
111	int ch, fflag, i, tflag;
112	char *targ, *shell;
113
114	/*
115	 * Prepare for execing ourselves.
116	 */
117	argc_copy = argc + 1;
118	argv_copy = malloc((argc_copy + 1) * sizeof(*argv_copy));
119	if (argv_copy == NULL)
120		err(1, "malloc");
121	argv_copy[0] = argv[0];
122	argv_copy[1] = "-K";
123	for (i = 1; i < argc; ++i) {
124		argv_copy[i + 1] = strdup(argv[i]);
125		if (argv_copy[i + 1] == NULL)
126			errx(1, "strdup: out of memory");
127	}
128	argv_copy[argc + 1] = NULL;
129
130	fflag = tflag = 0;
131	while ((ch = getopt(argc, argv, OPTIONS)) != -1)
132		switch(ch) {			/* User-visible flags. */
133		case '4':
134			family = PF_INET;
135			break;
136
137		case '6':
138			family = PF_INET6;
139			break;
140
141		case 'p':
142			pflag = 1;
143			break;
144		case 'r':
145			iamrecursive = 1;
146			break;
147						/* Server options. */
148		case 'd':
149			targetshouldbedirectory = 1;
150			break;
151		case 'f':			/* "from" */
152			iamremote = 1;
153			fflag = 1;
154			break;
155		case 't':			/* "to" */
156			iamremote = 1;
157			tflag = 1;
158			break;
159		case '?':
160		default:
161			usage();
162		}
163	argc -= optind;
164	argv += optind;
165
166	sp = getservbyname(shell = "shell", "tcp");
167	if (sp == NULL)
168		errx(1, "%s/tcp: unknown service", shell);
169	port = sp->s_port;
170
171	if ((pwd = getpwuid(userid = getuid())) == NULL)
172		errx(1, "unknown user %d", (int)userid);
173
174	rem = STDIN_FILENO;		/* XXX */
175
176	if (fflag) {			/* Follow "protocol", send data. */
177		(void)response();
178		(void)setuid(userid);
179		source(argc, argv);
180		exit(errs);
181	}
182
183	if (tflag) {			/* Receive data. */
184		(void)setuid(userid);
185		sink(argc, argv);
186		exit(errs);
187	}
188
189	if (argc < 2)
190		usage();
191	if (argc > 2)
192		targetshouldbedirectory = 1;
193
194	rem = -1;
195	/* Command to be executed on remote system using "rsh". */
196	(void)snprintf(cmd, sizeof(cmd), "rcp%s%s%s",
197	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
198	    targetshouldbedirectory ? " -d" : "");
199
200	(void)signal(SIGPIPE, lostconn);
201
202	if ((targ = colon(argv[argc - 1])))	/* Dest is remote host. */
203		toremote(targ, argc, argv);
204	else {
205		tolocal(argc, argv);		/* Dest is local host. */
206		if (targetshouldbedirectory)
207			verifydir(argv[argc - 1]);
208	}
209	exit(errs);
210}
211
212void
213toremote(char *targ, int argc, char *argv[])
214{
215	int i, len, tos;
216	char *bp, *host, *src, *suser, *thost, *tuser;
217
218	*targ++ = 0;
219	if (*targ == 0)
220		targ = ".";
221
222	if ((thost = strchr(argv[argc - 1], '@'))) {
223		/* user@host */
224		*thost++ = 0;
225		tuser = argv[argc - 1];
226		if (*tuser == '\0')
227			tuser = NULL;
228		else if (!okname(tuser))
229			exit(1);
230	} else {
231		thost = argv[argc - 1];
232		tuser = NULL;
233	}
234
235	for (i = 0; i < argc - 1; i++) {
236		src = colon(argv[i]);
237		if (src) {			/* remote to remote */
238			*src++ = 0;
239			if (*src == 0)
240				src = ".";
241			host = strchr(argv[i], '@');
242			len = strlen(_PATH_RSH) + strlen(argv[i]) +
243			    strlen(src) + (tuser ? strlen(tuser) : 0) +
244			    strlen(thost) + strlen(targ) + CMDNEEDS + 20;
245			if (!(bp = malloc(len)))
246				err(1, "malloc");
247			if (host) {
248				*host++ = 0;
249				suser = argv[i];
250				if (*suser == '\0')
251					suser = pwd->pw_name;
252				else if (!okname(suser)) {
253					++errs;
254					continue;
255				}
256				(void)snprintf(bp, len,
257				    "%s %s -l %s -n %s %s '%s%s%s:%s'",
258				    _PATH_RSH, host, suser, cmd, src,
259				    tuser ? tuser : "", tuser ? "@" : "",
260				    thost, targ);
261			} else
262				(void)snprintf(bp, len,
263				    "exec %s %s -n %s %s '%s%s%s:%s'",
264				    _PATH_RSH, argv[i], cmd, src,
265				    tuser ? tuser : "", tuser ? "@" : "",
266				    thost, targ);
267			(void)susystem(bp, userid);
268			(void)free(bp);
269		} else {			/* local to remote */
270			if (rem == -1) {
271				len = strlen(targ) + CMDNEEDS + 20;
272				if (!(bp = malloc(len)))
273					err(1, "malloc");
274				(void)snprintf(bp, len, "%s -t %s", cmd, targ);
275				host = thost;
276				rem = rcmd_af(&host, port,
277				    pwd->pw_name,
278				    tuser ? tuser : pwd->pw_name,
279				    bp, 0, family);
280				if (rem < 0)
281					exit(1);
282				if (family == PF_INET) {
283					tos = IPTOS_THROUGHPUT;
284					if (setsockopt(rem, IPPROTO_IP, IP_TOS,
285					    &tos, sizeof(int)) < 0)
286						warn("TOS (ignored)");
287				}
288				if (response() < 0)
289					exit(1);
290				(void)free(bp);
291				(void)setuid(userid);
292			}
293			source(1, argv+i);
294		}
295	}
296}
297
298void
299tolocal(int argc, char *argv[])
300{
301	int i, len, tos;
302	char *bp, *host, *src, *suser;
303
304	for (i = 0; i < argc - 1; i++) {
305		if (!(src = colon(argv[i]))) {		/* Local to local. */
306			len = strlen(_PATH_CP) + strlen(argv[i]) +
307			    strlen(argv[argc - 1]) + 20;
308			if (!(bp = malloc(len)))
309				err(1, "malloc");
310			(void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
311			    iamrecursive ? " -PR" : "", pflag ? " -p" : "",
312			    argv[i], argv[argc - 1]);
313			if (susystem(bp, userid))
314				++errs;
315			(void)free(bp);
316			continue;
317		}
318		*src++ = 0;
319		if (*src == 0)
320			src = ".";
321		if ((host = strchr(argv[i], '@')) == NULL) {
322			host = argv[i];
323			suser = pwd->pw_name;
324		} else {
325			*host++ = 0;
326			suser = argv[i];
327			if (*suser == '\0')
328				suser = pwd->pw_name;
329			else if (!okname(suser)) {
330				++errs;
331				continue;
332			}
333		}
334		len = strlen(src) + CMDNEEDS + 20;
335		if ((bp = malloc(len)) == NULL)
336			err(1, "malloc");
337		(void)snprintf(bp, len, "%s -f %s", cmd, src);
338		rem = rcmd_af(&host, port, pwd->pw_name, suser, bp, 0,
339			    family);
340		(void)free(bp);
341		if (rem < 0) {
342			++errs;
343			continue;
344		}
345		(void)seteuid(userid);
346		if (family == PF_INET) {
347			tos = IPTOS_THROUGHPUT;
348			if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos,
349			    sizeof(int)) < 0)
350				warn("TOS (ignored)");
351		}
352		sink(1, argv + argc - 1);
353		(void)seteuid(0);
354		(void)close(rem);
355		rem = -1;
356	}
357}
358
359void
360source(int argc, char *argv[])
361{
362	struct stat stb;
363	static BUF buffer;
364	BUF *bp;
365	off_t i;
366	int amt, fd, haderr, indx, result;
367	char *last, *name, buf[BUFSIZ];
368
369	for (indx = 0; indx < argc; ++indx) {
370		name = argv[indx];
371		if ((fd = open(name, O_RDONLY, 0)) < 0)
372			goto syserr;
373		if (fstat(fd, &stb)) {
374syserr:			run_err("%s: %s", name, strerror(errno));
375			goto next;
376		}
377		switch (stb.st_mode & S_IFMT) {
378		case S_IFREG:
379			break;
380		case S_IFDIR:
381			if (iamrecursive) {
382				rsource(name, &stb);
383				goto next;
384			}
385			/* FALLTHROUGH */
386		default:
387			run_err("%s: not a regular file", name);
388			goto next;
389		}
390		if ((last = strrchr(name, '/')) == NULL)
391			last = name;
392		else
393			++last;
394		if (pflag) {
395			/*
396			 * Make it compatible with possible future
397			 * versions expecting microseconds.
398			 */
399			(void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
400			    (long)stb.st_mtimespec.tv_sec,
401			    (long)stb.st_atimespec.tv_sec);
402			(void)write(rem, buf, strlen(buf));
403			if (response() < 0)
404				goto next;
405		}
406#define	MODEMASK	(S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
407		(void)snprintf(buf, sizeof(buf), "C%04o %jd %s\n",
408		    stb.st_mode & MODEMASK, (intmax_t)stb.st_size, last);
409		(void)write(rem, buf, strlen(buf));
410		if (response() < 0)
411			goto next;
412		if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
413next:			(void)close(fd);
414			continue;
415		}
416
417		/* Keep writing after an error so that we stay sync'd up. */
418		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
419			amt = bp->cnt;
420			if (i + amt > stb.st_size)
421				amt = stb.st_size - i;
422			if (!haderr) {
423				result = read(fd, bp->buf, amt);
424				if (result != amt)
425					haderr = result >= 0 ? EIO : errno;
426			}
427			if (haderr)
428				(void)write(rem, bp->buf, amt);
429			else {
430				result = write(rem, bp->buf, amt);
431				if (result != amt)
432					haderr = result >= 0 ? EIO : errno;
433			}
434		}
435		if (close(fd) && !haderr)
436			haderr = errno;
437		if (!haderr)
438			(void)write(rem, "", 1);
439		else
440			run_err("%s: %s", name, strerror(haderr));
441		(void)response();
442	}
443}
444
445void
446rsource(char *name, struct stat *statp)
447{
448	DIR *dirp;
449	struct dirent *dp;
450	char *last, *vect[1], path[PATH_MAX];
451
452	if (!(dirp = opendir(name))) {
453		run_err("%s: %s", name, strerror(errno));
454		return;
455	}
456	last = strrchr(name, '/');
457	if (last == 0)
458		last = name;
459	else
460		last++;
461	if (pflag) {
462		(void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
463		    (long)statp->st_mtimespec.tv_sec,
464		    (long)statp->st_atimespec.tv_sec);
465		(void)write(rem, path, strlen(path));
466		if (response() < 0) {
467			closedir(dirp);
468			return;
469		}
470	}
471	(void)snprintf(path, sizeof(path),
472	    "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
473	(void)write(rem, path, strlen(path));
474	if (response() < 0) {
475		closedir(dirp);
476		return;
477	}
478	while ((dp = readdir(dirp))) {
479		if (dp->d_ino == 0)
480			continue;
481		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
482			continue;
483		if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path)) {
484			run_err("%s/%s: name too long", name, dp->d_name);
485			continue;
486		}
487		(void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
488		vect[0] = path;
489		source(1, vect);
490	}
491	(void)closedir(dirp);
492	(void)write(rem, "E\n", 2);
493	(void)response();
494}
495
496void
497sink(int argc, char *argv[])
498{
499	static BUF buffer;
500	struct stat stb;
501	struct timeval tv[2];
502	enum { YES, NO, DISPLAYED } wrerr;
503	BUF *bp;
504	off_t i, j, size;
505	int amt, count, exists, first, mask, mode, ofd, omode;
506	int setimes, targisdir, wrerrno = 0;
507	char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ], path[PATH_MAX];
508
509#define	atime	tv[0]
510#define	mtime	tv[1]
511#define	SCREWUP(str)	{ why = str; goto screwup; }
512
513	setimes = targisdir = 0;
514	mask = umask(0);
515	if (!pflag)
516		(void)umask(mask);
517	if (argc != 1) {
518		run_err("ambiguous target");
519		exit(1);
520	}
521	targ = *argv;
522	if (targetshouldbedirectory)
523		verifydir(targ);
524	(void)write(rem, "", 1);
525	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
526		targisdir = 1;
527	for (first = 1;; first = 0) {
528		cp = buf;
529		if (read(rem, cp, 1) <= 0)
530			return;
531		if (*cp++ == '\n')
532			SCREWUP("unexpected <newline>");
533		do {
534			if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
535				SCREWUP("lost connection");
536			*cp++ = ch;
537		} while (cp < &buf[BUFSIZ - 1] && ch != '\n');
538		*cp = 0;
539
540		if (buf[0] == '\01' || buf[0] == '\02') {
541			if (iamremote == 0)
542				(void)write(STDERR_FILENO,
543				    buf + 1, strlen(buf + 1));
544			if (buf[0] == '\02')
545				exit(1);
546			++errs;
547			continue;
548		}
549		if (buf[0] == 'E') {
550			(void)write(rem, "", 1);
551			return;
552		}
553
554		if (ch == '\n')
555			*--cp = 0;
556
557		cp = buf;
558		if (*cp == 'T') {
559			setimes++;
560			cp++;
561			mtime.tv_sec = strtol(cp, &cp, 10);
562			if (!cp || *cp++ != ' ')
563				SCREWUP("mtime.sec not delimited");
564			mtime.tv_usec = strtol(cp, &cp, 10);
565			if (!cp || *cp++ != ' ')
566				SCREWUP("mtime.usec not delimited");
567			atime.tv_sec = strtol(cp, &cp, 10);
568			if (!cp || *cp++ != ' ')
569				SCREWUP("atime.sec not delimited");
570			atime.tv_usec = strtol(cp, &cp, 10);
571			if (!cp || *cp++ != '\0')
572				SCREWUP("atime.usec not delimited");
573			(void)write(rem, "", 1);
574			continue;
575		}
576		if (*cp != 'C' && *cp != 'D') {
577			/*
578			 * Check for the case "rcp remote:foo\* local:bar".
579			 * In this case, the line "No match." can be returned
580			 * by the shell before the rcp command on the remote is
581			 * executed so the ^Aerror_message convention isn't
582			 * followed.
583			 */
584			if (first) {
585				run_err("%s", cp);
586				exit(1);
587			}
588			SCREWUP("expected control record");
589		}
590		mode = 0;
591		for (++cp; cp < buf + 5; cp++) {
592			if (*cp < '0' || *cp > '7')
593				SCREWUP("bad mode");
594			mode = (mode << 3) | (*cp - '0');
595		}
596		if (*cp++ != ' ')
597			SCREWUP("mode not delimited");
598
599		for (size = 0; isdigit(*cp);)
600			size = size * 10 + (*cp++ - '0');
601		if (*cp++ != ' ')
602			SCREWUP("size not delimited");
603		if (targisdir) {
604			if (strlen(targ) + (*targ ? 1 : 0) + strlen(cp)
605					>= sizeof(path)) {
606				run_err("%s%s%s: name too long", targ,
607					*targ ? "/" : "", cp);
608				exit(1);
609			}
610			(void)snprintf(path, sizeof(path), "%s%s%s", targ,
611			    *targ ? "/" : "", cp);
612			np = path;
613		} else
614			np = targ;
615		exists = stat(np, &stb) == 0;
616		if (buf[0] == 'D') {
617			int mod_flag = pflag;
618			if (exists) {
619				if (!S_ISDIR(stb.st_mode)) {
620					errno = ENOTDIR;
621					goto bad;
622				}
623				if (pflag)
624					(void)chmod(np, mode);
625			} else {
626				/* Handle copying from a read-only directory */
627				mod_flag = 1;
628				if (mkdir(np, mode | S_IRWXU) < 0)
629					goto bad;
630			}
631			vect[0] = np;
632			sink(1, vect);
633			if (setimes) {
634				setimes = 0;
635				if (utimes(np, tv) < 0)
636				    run_err("%s: set times: %s",
637					np, strerror(errno));
638			}
639			if (mod_flag)
640				(void)chmod(np, mode);
641			continue;
642		}
643		omode = mode;
644		mode |= S_IWRITE;
645		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
646bad:			run_err("%s: %s", np, strerror(errno));
647			continue;
648		}
649		(void)write(rem, "", 1);
650		if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
651			(void)close(ofd);
652			continue;
653		}
654		cp = bp->buf;
655		wrerr = NO;
656		for (count = i = 0; i < size; i += BUFSIZ) {
657			amt = BUFSIZ;
658			if (i + amt > size)
659				amt = size - i;
660			count += amt;
661			do {
662				j = read(rem, cp, amt);
663				if (j <= 0) {
664					run_err("%s", j ? strerror(errno) :
665					    "dropped connection");
666					exit(1);
667				}
668				amt -= j;
669				cp += j;
670			} while (amt > 0);
671			if (count == bp->cnt) {
672				/* Keep reading so we stay sync'd up. */
673				if (wrerr == NO) {
674					j = write(ofd, bp->buf, count);
675					if (j != count) {
676						wrerr = YES;
677						wrerrno = j >= 0 ? EIO : errno;
678					}
679				}
680				count = 0;
681				cp = bp->buf;
682			}
683		}
684		if (count != 0 && wrerr == NO &&
685		    (j = write(ofd, bp->buf, count)) != count) {
686			wrerr = YES;
687			wrerrno = j >= 0 ? EIO : errno;
688		}
689		if (ftruncate(ofd, size)) {
690			run_err("%s: truncate: %s", np, strerror(errno));
691			wrerr = DISPLAYED;
692		}
693		if (pflag) {
694			if (exists || omode != mode)
695				if (fchmod(ofd, omode))
696					run_err("%s: set mode: %s",
697					    np, strerror(errno));
698		} else {
699			if (!exists && omode != mode)
700				if (fchmod(ofd, omode & ~mask))
701					run_err("%s: set mode: %s",
702					    np, strerror(errno));
703		}
704		(void)close(ofd);
705		(void)response();
706		if (setimes && wrerr == NO) {
707			setimes = 0;
708			if (utimes(np, tv) < 0) {
709				run_err("%s: set times: %s",
710				    np, strerror(errno));
711				wrerr = DISPLAYED;
712			}
713		}
714		switch(wrerr) {
715		case YES:
716			run_err("%s: %s", np, strerror(wrerrno));
717			break;
718		case NO:
719			(void)write(rem, "", 1);
720			break;
721		case DISPLAYED:
722			break;
723		}
724	}
725screwup:
726	run_err("protocol error: %s", why);
727	exit(1);
728}
729
730int
731response(void)
732{
733	char ch, *cp, resp, rbuf[BUFSIZ];
734
735	if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
736		lostconn(0);
737
738	cp = rbuf;
739	switch(resp) {
740	case 0:				/* ok */
741		return (0);
742	default:
743		*cp++ = resp;
744		/* FALLTHROUGH */
745	case 1:				/* error, followed by error msg */
746	case 2:				/* fatal error, "" */
747		do {
748			if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
749				lostconn(0);
750			*cp++ = ch;
751		} while (cp < &rbuf[BUFSIZ] && ch != '\n');
752
753		if (!iamremote)
754			(void)write(STDERR_FILENO, rbuf, cp - rbuf);
755		++errs;
756		if (resp == 1)
757			return (-1);
758		exit(1);
759	}
760	/* NOTREACHED */
761}
762
763void
764usage(void)
765{
766	(void)fprintf(stderr, "%s\n%s\n",
767	    "usage: rcp [-46p] f1 f2",
768	    "       rcp [-46pr] f1 ... fn directory");
769	exit(1);
770}
771
772#include <stdarg.h>
773
774void
775run_err(const char *fmt, ...)
776{
777	static FILE *fp;
778	va_list ap;
779
780	++errs;
781	if (fp == NULL && !(fp = fdopen(rem, "w")))
782		return;
783	(void)fprintf(fp, "%c", 0x01);
784	(void)fprintf(fp, "rcp: ");
785	va_start(ap, fmt);
786	(void)vfprintf(fp, fmt, ap);
787	va_end(ap);
788	(void)fprintf(fp, "\n");
789	(void)fflush(fp);
790
791	if (!iamremote) {
792		va_start(ap, fmt);
793		vwarnx(fmt, ap);
794		va_end(ap);
795	}
796
797	va_end(ap);
798}
799