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