e1751019b1e6d8e7adc871a8a10ddbccccbac32d
[games.git] / bin / rcp / rcp.c
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  * @(#) Copyright (c) 1983, 1990, 1992, 1993 The Regents of the University of California.  All rights reserved.
41  * @(#)rcp.c    8.2 (Berkeley) 4/2/94
42  * $FreeBSD: src/bin/rcp/rcp.c,v 1.26.2.6 2004/09/16 12:16:10 delphij Exp $
43  * $DragonFly: src/bin/rcp/rcp.c,v 1.6 2005/01/07 20:30:21 dillon Exp $
44  */
45
46 #include <sys/cdefs.h>
47 #include <sys/param.h>
48 #include <sys/stat.h>
49 #include <sys/time.h>
50 #include <sys/socket.h>
51 #include <netinet/in.h>
52 #include <netinet/in_systm.h>
53 #include <netinet/ip.h>
54
55 #include <ctype.h>
56 #include <dirent.h>
57 #include <err.h>
58 #include <errno.h>
59 #include <fcntl.h>
60 #include <libutil.h>
61 #include <limits.h>
62 #include <netdb.h>
63 #include <paths.h>
64 #include <pwd.h>
65 #include <signal.h>
66 #include <stdio.h>
67 #include <stdlib.h>
68 #include <string.h>
69 #include <string.h>
70 #include <unistd.h>
71
72 #include "extern.h"
73
74 #ifdef KERBEROS
75 #include <openssl/des.h>
76 #include <krb.h>
77 #include "bsd_locl.h"
78
79 char    dst_realm_buf[REALM_SZ];
80 char    *dest_realm = NULL;
81 int     use_kerberos = 1;
82 CREDENTIALS     cred;
83 Key_schedule    schedule;
84 extern  char    *krb_realmofhost();
85 #ifdef CRYPT
86 int     doencrypt = 0;
87 #define OPTIONS "46dfKk:prtx"
88 #else
89 #define OPTIONS "46dfKk:prt"
90 #endif
91 #else
92 #define OPTIONS "46dfprt"
93 #endif
94
95 struct passwd *pwd;
96 u_short port;
97 uid_t   userid;
98 int errs, rem;
99 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
100 int family = PF_UNSPEC;
101
102 static int argc_copy;
103 static char **argv_copy;
104
105 #define CMDNEEDS        64
106 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
107
108 #ifdef KERBEROS
109 int      kerberos(char **, char *, char *, char *);
110 void     oldw(const char *, ...) __printflike(1, 2);
111 #endif
112 int      response(void);
113 void     rsource(char *, struct stat *);
114 void     sink(int, char *[]);
115 void     source(int, char *[]);
116 void     tolocal(int, char *[]);
117 void     toremote(char *, int, char *[]);
118 void     usage(void);
119
120 int
121 main(int argc, char *argv[])
122 {
123         struct servent *sp;
124         int ch, fflag, i, tflag;
125         char *targ, *shell;
126 #ifdef KERBEROS
127         char *k;
128 #endif
129
130         /*
131          * Prepare for execing ourselves.
132          */
133         argc_copy = argc + 1;
134         argv_copy = malloc((argc_copy + 1) * sizeof(*argv_copy));
135         if (argv_copy == NULL)
136                 err(1, "malloc");
137         argv_copy[0] = argv[0];
138         argv_copy[1] = __DECONST(char *, "-K");
139         for (i = 1; i < argc; ++i) {
140                 argv_copy[i + 1] = strdup(argv[i]);
141                 if (argv_copy[i + 1] == NULL)
142                         errx(1, "strdup: out of memory");
143         }
144         argv_copy[argc + 1] = NULL;
145
146         fflag = tflag = 0;
147         while ((ch = getopt(argc, argv, OPTIONS)) != -1)
148                 switch(ch) {                    /* User-visible flags. */
149                 case '4':
150                         family = PF_INET;
151                         break;
152
153                 case '6':
154                         family = PF_INET6;
155                         break;
156
157                 case 'K':
158 #ifdef KERBEROS
159                         use_kerberos = 0;
160 #endif
161                         break;
162 #ifdef  KERBEROS
163                 case 'k':
164                         dest_realm = dst_realm_buf;
165                         strncpy(dst_realm_buf, optarg, REALM_SZ - 1);
166                         dst_realm_buf[REALM_SZ - 1] = '\0';
167                         break;
168 #ifdef CRYPT
169                 case 'x':
170                         doencrypt = 1;
171                         /* des_set_key(cred.session, schedule); */
172                         break;
173 #endif
174 #endif
175                 case 'p':
176                         pflag = 1;
177                         break;
178                 case 'r':
179                         iamrecursive = 1;
180                         break;
181                                                 /* Server options. */
182                 case 'd':
183                         targetshouldbedirectory = 1;
184                         break;
185                 case 'f':                       /* "from" */
186                         iamremote = 1;
187                         fflag = 1;
188                         break;
189                 case 't':                       /* "to" */
190                         iamremote = 1;
191                         tflag = 1;
192                         break;
193                 case '?':
194                 default:
195                         usage();
196                 }
197         argc -= optind;
198         argv += optind;
199
200 #ifdef KERBEROS
201         k = auth_getval("auth_list");
202         if (k && !strstr(k, "kerberos"))
203             use_kerberos = 0;
204         if (use_kerberos) {
205 #ifdef CRYPT
206                 shell = doencrypt ? __DECONST(char *, "ekshell") :
207                                     __DECONST(char *, "kshell");
208 #else
209                 shell = __DECONST(char *, "kshell");
210 #endif
211                 if ((sp = getservbyname(shell, "tcp")) == NULL) {
212                         use_kerberos = 0;
213                         oldw("can't get entry for %s/tcp service", shell);
214                         sp = getservbyname(shell = "shell", "tcp");
215                 }
216         } else
217                 shell = __DECONST(char *, "shell");
218                 sp = getservbyname(shell, "tcp");
219 #else
220         shell = __DECONST(char *, "shell");
221         sp = getservbyname(shell, "tcp");
222 #endif
223         if (sp == NULL)
224                 errx(1, "%s/tcp: unknown service", shell);
225         port = sp->s_port;
226
227         if ((pwd = getpwuid(userid = getuid())) == NULL)
228                 errx(1, "unknown user %d", (int)userid);
229
230         rem = STDIN_FILENO;             /* XXX */
231
232         if (fflag) {                    /* Follow "protocol", send data. */
233                 response();
234                 setuid(userid);
235                 source(argc, argv);
236                 exit(errs);
237         }
238
239         if (tflag) {                    /* Receive data. */
240                 setuid(userid);
241                 sink(argc, argv);
242                 exit(errs);
243         }
244
245         if (argc < 2)
246                 usage();
247         if (argc > 2)
248                 targetshouldbedirectory = 1;
249
250         rem = -1;
251         /* Command to be executed on remote system using "rsh". */
252 #ifdef  KERBEROS
253         snprintf(cmd, sizeof(cmd),
254             "rcp%s%s%s%s", iamrecursive ? " -r" : "",
255 #ifdef CRYPT
256             (doencrypt && use_kerberos ? " -x" : ""),
257 #else
258             "",
259 #endif
260             pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");
261 #else
262         snprintf(cmd, sizeof(cmd), "rcp%s%s%s",
263             iamrecursive ? " -r" : "", pflag ? " -p" : "",
264             targetshouldbedirectory ? " -d" : "");
265 #endif
266
267         signal(SIGPIPE, lostconn);
268
269         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
270                 toremote(targ, argc, argv);
271         else {
272                 tolocal(argc, argv);            /* Dest is local host. */
273                 if (targetshouldbedirectory)
274                         verifydir(argv[argc - 1]);
275         }
276         exit(errs);
277 }
278
279 void
280 toremote(char *targ, int argc, char *argv[])
281 {
282         int i, len, tos;
283         char *bp, *host, *src, *suser, *thost, *tuser;
284
285         *targ++ = 0;
286         if (*targ == 0)
287                 targ = __DECONST(char *, ".");
288
289         if ((thost = strchr(argv[argc - 1], '@'))) {
290                 /* user@host */
291                 *thost++ = 0;
292                 tuser = argv[argc - 1];
293                 if (*tuser == '\0')
294                         tuser = NULL;
295                 else if (!okname(tuser))
296                         exit(1);
297         } else {
298                 thost = argv[argc - 1];
299                 tuser = NULL;
300         }
301
302         for (i = 0; i < argc - 1; i++) {
303                 src = colon(argv[i]);
304                 if (src) {                      /* remote to remote */
305                         *src++ = 0;
306                         if (*src == 0)
307                                 src = __DECONST(char *, ".");
308                         host = strchr(argv[i], '@');
309                         len = strlen(_PATH_RSH) + strlen(argv[i]) +
310                             strlen(src) + (tuser ? strlen(tuser) : 0) +
311                             strlen(thost) + strlen(targ) + CMDNEEDS + 20;
312                         if (!(bp = malloc(len)))
313                                 err(1, "malloc");
314                         if (host) {
315                                 *host++ = 0;
316                                 suser = argv[i];
317                                 if (*suser == '\0')
318                                         suser = pwd->pw_name;
319                                 else if (!okname(suser)) {
320                                         ++errs;
321                                         continue;
322                                 }
323                                 snprintf(bp, len,
324                                     "%s %s -l %s -n %s %s '%s%s%s:%s'",
325                                     _PATH_RSH, host, suser, cmd, src,
326                                     tuser ? tuser : "", tuser ? "@" : "",
327                                     thost, targ);
328                         } else
329                                 snprintf(bp, len,
330                                     "exec %s %s -n %s %s '%s%s%s:%s'",
331                                     _PATH_RSH, argv[i], cmd, src,
332                                     tuser ? tuser : "", tuser ? "@" : "",
333                                     thost, targ);
334                         susystem(bp, userid);
335                         free(bp);
336                 } else {                        /* local to remote */
337                         if (rem == -1) {
338                                 len = strlen(targ) + CMDNEEDS + 20;
339                                 if (!(bp = malloc(len)))
340                                         err(1, "malloc");
341                                 snprintf(bp, len, "%s -t %s", cmd, targ);
342                                 host = thost;
343 #ifdef KERBEROS
344                                 if (use_kerberos)
345                                         rem = kerberos(&host, bp,
346                                             pwd->pw_name,
347                                             tuser ? tuser : pwd->pw_name);
348                                 else
349 #endif
350                                         rem = rcmd_af(&host, port,
351                                             pwd->pw_name,
352                                             tuser ? tuser : pwd->pw_name,
353                                             bp, 0, family);
354                                 if (rem < 0)
355                                         exit(1);
356                                 if (family == PF_INET) {
357                                         tos = IPTOS_THROUGHPUT;
358                                         if (setsockopt(rem, IPPROTO_IP, IP_TOS,
359                                             &tos, sizeof(int)) < 0)
360                                                 warn("TOS (ignored)");
361                                 }
362                                 if (response() < 0)
363                                         exit(1);
364                                 free(bp);
365                                 setuid(userid);
366                         }
367                         source(1, argv+i);
368                 }
369         }
370 }
371
372 void
373 tolocal(int argc, char *argv[])
374 {
375         int i, len, tos;
376         char *bp, *host, *src, *suser;
377
378         for (i = 0; i < argc - 1; i++) {
379                 if (!(src = colon(argv[i]))) {          /* Local to local. */
380                         len = strlen(_PATH_CP) + strlen(argv[i]) +
381                             strlen(argv[argc - 1]) + 20;
382                         if (!(bp = malloc(len)))
383                                 err(1, "malloc");
384                         snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
385                             iamrecursive ? " -PR" : "", pflag ? " -p" : "",
386                             argv[i], argv[argc - 1]);
387                         if (susystem(bp, userid))
388                                 ++errs;
389                         free(bp);
390                         continue;
391                 }
392                 *src++ = 0;
393                 if (*src == 0)
394                         src = __DECONST(char *, ".");
395                 if ((host = strchr(argv[i], '@')) == NULL) {
396                         host = argv[i];
397                         suser = pwd->pw_name;
398                 } else {
399                         *host++ = 0;
400                         suser = argv[i];
401                         if (*suser == '\0')
402                                 suser = pwd->pw_name;
403                         else if (!okname(suser)) {
404                                 ++errs;
405                                 continue;
406                         }
407                 }
408                 len = strlen(src) + CMDNEEDS + 20;
409                 if ((bp = malloc(len)) == NULL)
410                         err(1, "malloc");
411                 snprintf(bp, len, "%s -f %s", cmd, src);
412                 rem =
413 #ifdef KERBEROS
414                     use_kerberos ?
415                         kerberos(&host, bp, pwd->pw_name, suser) :
416 #endif
417                         rcmd_af(&host, port, pwd->pw_name, suser, bp, 0,
418                             family);
419                 free(bp);
420                 if (rem < 0) {
421                         ++errs;
422                         continue;
423                 }
424                 seteuid(userid);
425                 if (family == PF_INET) {
426                         tos = IPTOS_THROUGHPUT;
427                         if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos,
428                             sizeof(int)) < 0)
429                                 warn("TOS (ignored)");
430                 }
431                 sink(1, argv + argc - 1);
432                 seteuid(0);
433                 close(rem);
434                 rem = -1;
435         }
436 }
437
438 void
439 source(int argc, char *argv[])
440 {
441         struct stat stb;
442         static BUF buffer;
443         BUF *bp;
444         off_t i;
445         int amt, fd, haderr, indx, result;
446         char *last, *name, buf[BUFSIZ];
447
448         for (indx = 0; indx < argc; ++indx) {
449                 name = argv[indx];
450                 if ((fd = open(name, O_RDONLY, 0)) < 0)
451                         goto syserr;
452                 if (fstat(fd, &stb)) {
453 syserr:                 run_err("%s: %s", name, strerror(errno));
454                         goto next;
455                 }
456                 switch (stb.st_mode & S_IFMT) {
457                 case S_IFREG:
458                         break;
459                 case S_IFDIR:
460                         if (iamrecursive) {
461                                 rsource(name, &stb);
462                                 goto next;
463                         }
464                         /* FALLTHROUGH */
465                 default:
466                         run_err("%s: not a regular file", name);
467                         goto next;
468                 }
469                 if ((last = strrchr(name, '/')) == NULL)
470                         last = name;
471                 else
472                         ++last;
473                 if (pflag) {
474                         /*
475                          * Make it compatible with possible future
476                          * versions expecting microseconds.
477                          */
478                         snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
479                             (long)stb.st_mtimespec.tv_sec,
480                             (long)stb.st_atimespec.tv_sec);
481                         write(rem, buf, strlen(buf));
482                         if (response() < 0)
483                                 goto next;
484                 }
485 #define MODEMASK        (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
486                 snprintf(buf, sizeof(buf), "C%04o %jd %s\n",
487                     stb.st_mode & MODEMASK, (intmax_t)stb.st_size, last);
488                 write(rem, buf, strlen(buf));
489                 if (response() < 0)
490                         goto next;
491                 if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
492 next:                   (void)close(fd);
493                         continue;
494                 }
495
496                 /* Keep writing after an error so that we stay sync'd up. */
497                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
498                         amt = bp->cnt;
499                         if (i + amt > stb.st_size)
500                                 amt = stb.st_size - i;
501                         if (!haderr) {
502                                 result = read(fd, bp->buf, amt);
503                                 if (result != amt)
504                                         haderr = result >= 0 ? EIO : errno;
505                         }
506                         if (haderr)
507                                 write(rem, bp->buf, amt);
508                         else {
509                                 result = write(rem, bp->buf, amt);
510                                 if (result != amt)
511                                         haderr = result >= 0 ? EIO : errno;
512                         }
513                 }
514                 if (close(fd) && !haderr)
515                         haderr = errno;
516                 if (!haderr)
517                         write(rem, "", 1);
518                 else
519                         run_err("%s: %s", name, strerror(haderr));
520                 response();
521         }
522 }
523
524 void
525 rsource(char *name, struct stat *statp)
526 {
527         DIR *dirp;
528         struct dirent *dp;
529         char *last, *vect[1], path[PATH_MAX];
530
531         if (!(dirp = opendir(name))) {
532                 run_err("%s: %s", name, strerror(errno));
533                 return;
534         }
535         last = strrchr(name, '/');
536         if (last == 0)
537                 last = name;
538         else
539                 last++;
540         if (pflag) {
541                 snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
542                     (long)statp->st_mtimespec.tv_sec,
543                     (long)statp->st_atimespec.tv_sec);
544                 write(rem, path, strlen(path));
545                 if (response() < 0) {
546                         closedir(dirp);
547                         return;
548                 }
549         }
550         snprintf(path, sizeof(path),
551             "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
552         write(rem, path, strlen(path));
553         if (response() < 0) {
554                 closedir(dirp);
555                 return;
556         }
557         while ((dp = readdir(dirp))) {
558                 if (dp->d_ino == 0)
559                         continue;
560                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
561                         continue;
562                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path)) {
563                         run_err("%s/%s: name too long", name, dp->d_name);
564                         continue;
565                 }
566                 snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
567                 vect[0] = path;
568                 source(1, vect);
569         }
570         closedir(dirp);
571         write(rem, "E\n", 2);
572         response();
573 }
574
575 void
576 sink(int argc, char *argv[])
577 {
578         static BUF buffer;
579         struct stat stb;
580         struct timeval tv[2];
581         enum { YES, NO, DISPLAYED } wrerr;
582         BUF *bp;
583         off_t i, j, size;
584         size_t count;
585         int amt, exists, first, mask, mode, ofd, omode;
586         int setimes, targisdir, wrerrno = 0;
587         char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ], path[PATH_MAX];
588
589 #define atime   tv[0]
590 #define mtime   tv[1]
591 #define SCREWUP(str)    { why = __DECONST(char *, str); goto screwup; }
592
593         setimes = targisdir = 0;
594         mask = umask(0);
595         if (!pflag)
596                 umask(mask);
597         if (argc != 1) {
598                 run_err("ambiguous target");
599                 exit(1);
600         }
601         targ = *argv;
602         if (targetshouldbedirectory)
603                 verifydir(targ);
604         write(rem, "", 1);
605         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
606                 targisdir = 1;
607         for (first = 1;; first = 0) {
608                 cp = buf;
609                 if (read(rem, cp, 1) <= 0)
610                         return;
611                 if (*cp++ == '\n')
612                         SCREWUP("unexpected <newline>");
613                 do {
614                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
615                                 SCREWUP("lost connection");
616                         *cp++ = ch;
617                 } while (cp < &buf[BUFSIZ - 1] && ch != '\n');
618                 *cp = 0;
619
620                 if (buf[0] == '\01' || buf[0] == '\02') {
621                         if (iamremote == 0)
622                                 write(STDERR_FILENO,
623                                     buf + 1, strlen(buf + 1));
624                         if (buf[0] == '\02')
625                                 exit(1);
626                         ++errs;
627                         continue;
628                 }
629                 if (buf[0] == 'E') {
630                         write(rem, "", 1);
631                         return;
632                 }
633
634                 if (ch == '\n')
635                         *--cp = 0;
636
637                 cp = buf;
638                 if (*cp == 'T') {
639                         setimes++;
640                         cp++;
641                         mtime.tv_sec = strtol(cp, &cp, 10);
642                         if (!cp || *cp++ != ' ')
643                                 SCREWUP("mtime.sec not delimited");
644                         mtime.tv_usec = strtol(cp, &cp, 10);
645                         if (!cp || *cp++ != ' ')
646                                 SCREWUP("mtime.usec not delimited");
647                         atime.tv_sec = strtol(cp, &cp, 10);
648                         if (!cp || *cp++ != ' ')
649                                 SCREWUP("atime.sec not delimited");
650                         atime.tv_usec = strtol(cp, &cp, 10);
651                         if (!cp || *cp++ != '\0')
652                                 SCREWUP("atime.usec not delimited");
653                         write(rem, "", 1);
654                         continue;
655                 }
656                 if (*cp != 'C' && *cp != 'D') {
657                         /*
658                          * Check for the case "rcp remote:foo\* local:bar".
659                          * In this case, the line "No match." can be returned
660                          * by the shell before the rcp command on the remote is
661                          * executed so the ^Aerror_message convention isn't
662                          * followed.
663                          */
664                         if (first) {
665                                 run_err("%s", cp);
666                                 exit(1);
667                         }
668                         SCREWUP("expected control record");
669                 }
670                 mode = 0;
671                 for (++cp; cp < buf + 5; cp++) {
672                         if (*cp < '0' || *cp > '7')
673                                 SCREWUP("bad mode");
674                         mode = (mode << 3) | (*cp - '0');
675                 }
676                 if (*cp++ != ' ')
677                         SCREWUP("mode not delimited");
678
679                 for (size = 0; isdigit(*cp);)
680                         size = size * 10 + (*cp++ - '0');
681                 if (*cp++ != ' ')
682                         SCREWUP("size not delimited");
683                 if (targisdir) {
684                         if (strlen(targ) + (*targ ? 1 : 0) + strlen(cp)
685                                     >= sizeof(path)) {
686                                 run_err("%s%s%s: name too long", targ,
687                                         *targ ? "/" : "", cp);
688                                 exit(1);
689                         }
690                         snprintf(path, sizeof(path), "%s%s%s", targ,
691                                 *targ ? "/" : "", cp);
692                         np = path;
693                 } else
694                         np = targ;
695                 exists = stat(np, &stb) == 0;
696                 if (buf[0] == 'D') {
697                         int mod_flag = pflag;
698                         if (exists) {
699                                 if (!S_ISDIR(stb.st_mode)) {
700                                         errno = ENOTDIR;
701                                         goto bad;
702                                 }
703                                 if (pflag)
704                                         chmod(np, mode);
705                         } else {
706                                 /* Handle copying from a read-only directory */
707                                 mod_flag = 1;
708                                 if (mkdir(np, mode | S_IRWXU) < 0)
709                                         goto bad;
710                         }
711                         vect[0] = np;
712                         sink(1, vect);
713                         if (setimes) {
714                                 setimes = 0;
715                                 if (utimes(np, tv) < 0)
716                                     run_err("%s: set times: %s",
717                                         np, strerror(errno));
718                         }
719                         if (mod_flag)
720                                 chmod(np, mode);
721                         continue;
722                 }
723                 omode = mode;
724                 mode |= S_IWRITE;
725                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
726 bad:                    run_err("%s: %s", np, strerror(errno));
727                         continue;
728                 }
729                 write(rem, "", 1);
730                 if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
731                         close(ofd);
732                         continue;
733                 }
734                 cp = bp->buf;
735                 wrerr = NO;
736                 for (count = i = 0; i < size; i += BUFSIZ) {
737                         amt = BUFSIZ;
738                         if (i + amt > size)
739                                 amt = size - i;
740                         count += amt;
741                         do {
742                                 j = read(rem, cp, amt);
743                                 if (j <= 0) {
744                                         run_err("%s", j ? strerror(errno) :
745                                             "dropped connection");
746                                         exit(1);
747                                 }
748                                 amt -= j;
749                                 cp += j;
750                         } while (amt > 0);
751                         if (count == bp->cnt) {
752                                 /* Keep reading so we stay sync'd up. */
753                                 if (wrerr == NO) {
754                                         j = write(ofd, bp->buf, count);
755                                         if (j != (off_t)count) {
756                                                 wrerr = YES;
757                                                 wrerrno = j >= 0 ? EIO : errno;
758                                         }
759                                 }
760                                 count = 0;
761                                 cp = bp->buf;
762                         }
763                 }
764                 if (count != 0 && wrerr == NO &&
765                     (j = write(ofd, bp->buf, count)) != (off_t)count) {
766                         wrerr = YES;
767                         wrerrno = j >= 0 ? EIO : errno;
768                 }
769                 if (ftruncate(ofd, size)) {
770                         run_err("%s: truncate: %s", np, strerror(errno));
771                         wrerr = DISPLAYED;
772                 }
773                 if (pflag) {
774                         if (exists || omode != mode)
775                                 if (fchmod(ofd, omode))
776                                         run_err("%s: set mode: %s",
777                                             np, strerror(errno));
778                 } else {
779                         if (!exists && omode != mode)
780                                 if (fchmod(ofd, omode & ~mask))
781                                         run_err("%s: set mode: %s",
782                                             np, strerror(errno));
783                 }
784                 close(ofd);
785                 response();
786                 if (setimes && wrerr == NO) {
787                         setimes = 0;
788                         if (utimes(np, tv) < 0) {
789                                 run_err("%s: set times: %s",
790                                     np, strerror(errno));
791                                 wrerr = DISPLAYED;
792                         }
793                 }
794                 switch(wrerr) {
795                 case YES:
796                         run_err("%s: %s", np, strerror(wrerrno));
797                         break;
798                 case NO:
799                         write(rem, "", 1);
800                         break;
801                 case DISPLAYED:
802                         break;
803                 }
804         }
805 screwup:
806         run_err("protocol error: %s", why);
807         exit(1);
808 }
809
810 #ifdef KERBEROS
811 int
812 kerberos(char **host, char *bp, char *locuser, char *user)
813 {
814         if (use_kerberos) {
815                 setuid(getuid());
816                 rem = KSUCCESS;
817                 errno = 0;
818                 if (dest_realm == NULL)
819                         dest_realm = krb_realmofhost(*host);
820                 rem =
821 #ifdef CRYPT
822                     doencrypt ?
823                         krcmd_mutual(host,
824                             port, user, bp, 0, dest_realm, &cred, schedule) :
825 #endif
826                         krcmd(host, port, user, bp, 0, dest_realm);
827
828                 if (rem < 0) {
829                         if (errno == ECONNREFUSED)
830                             oldw("remote host doesn't support Kerberos");
831                         else if (errno == ENOENT)
832                             oldw("can't provide Kerberos authentication data");
833                         execv(_PATH_RCP, argv_copy);
834                         err(1, "execv: %s", _PATH_RCP);
835                 }
836         } else {
837 #ifdef CRYPT
838                 if (doencrypt)
839                         errx(1,
840                            "the -x option requires Kerberos authentication");
841 #endif
842                 rem = rcmd_af(host, port, locuser, user, bp, 0, family);
843         }
844         return (rem);
845 }
846 #endif /* KERBEROS */
847
848 int
849 response(void)
850 {
851         char ch, *cp, resp, rbuf[BUFSIZ];
852
853         if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
854                 lostconn(0);
855
856         cp = rbuf;
857         switch(resp) {
858         case 0:                         /* ok */
859                 return (0);
860         default:
861                 *cp++ = resp;
862                 /* FALLTHROUGH */
863         case 1:                         /* error, followed by error msg */
864         case 2:                         /* fatal error, "" */
865                 do {
866                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
867                                 lostconn(0);
868                         *cp++ = ch;
869                 } while (cp < &rbuf[BUFSIZ] && ch != '\n');
870
871                 if (!iamremote)
872                         write(STDERR_FILENO, rbuf, cp - rbuf);
873                 ++errs;
874                 if (resp == 1)
875                         return (-1);
876                 exit(1);
877         }
878         /* NOTREACHED */
879 }
880
881 void
882 usage(void)
883 {
884 #ifdef KERBEROS
885 #ifdef CRYPT
886         fprintf(stderr, "%s\n%s\n",
887             "usage: rcp [-46Kpx] [-k realm] f1 f2",
888             "       rcp [-46Kprx] [-k realm] f1 ... fn directory");
889 #else
890         fprintf(stderr, "%s\n%s\n",
891             "usage: rcp [-46Kp] [-k realm] f1 f2",
892             "       rcp [-46Kpr] [-k realm] f1 ... fn directory");
893 #endif
894 #else
895         fprintf(stderr, "%s\n%s\n",
896             "usage: rcp [-46p] f1 f2",
897             "       rcp [-46pr] f1 ... fn directory");
898 #endif
899         exit(1);
900 }
901
902 #include <stdarg.h>
903
904 #ifdef KERBEROS
905 void
906 oldw(const char *fmt, ...)
907 {
908         va_list ap;
909         va_start(ap, fmt);
910         fprintf(stderr, "rcp: ");
911         vfprintf(stderr, fmt, ap);
912         fprintf(stderr, ", using standard rcp\n");
913         va_end(ap);
914 }
915 #endif
916
917 void
918 run_err(const char *fmt, ...)
919 {
920         static FILE *fp;
921         va_list ap;
922         va_start(ap, fmt);
923
924         ++errs;
925         if (fp == NULL && !(fp = fdopen(rem, "w")))
926                 return;
927         fprintf(fp, "%c", 0x01);
928         fprintf(fp, "rcp: ");
929         vfprintf(fp, fmt, ap);
930         fprintf(fp, "\n");
931         fflush(fp);
932
933         if (!iamremote)
934                 vwarnx(fmt, ap);
935
936         va_end(ap);
937 }