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
  41 #ifndef lint
  42 static char const copyright[] =
  43 "@(#) Copyright (c) 1983, 1990, 1992, 1993\n\
  44         The Regents of the University of California.  All rights reserved.\n";
  45 #endif /* not lint */
  46
  47 #ifndef lint
  48 #if 0
  49 static char sccsid[] = "@(#)rcp.c       8.2 (Berkeley) 4/2/94";
  50 #endif
  51 #endif /* not lint */
  52 #include <sys/cdefs.h>
  53 __FBSDID("$FreeBSD: src/bin/rcp/rcp.c,v 1.26.2.5 2002/08/16 20:06:34 ume Exp $");
  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 <stdio.h>
  75 #include <stdlib.h>
  76 #include <string.h>
  77 #include <string.h>
  78 #include <unistd.h>
  79
  80 #include "extern.h"
  81
  82 #ifdef KERBEROS
  83 #include <openssl/des.h>
  84 #include <krb.h>
  85 #include "bsd_locl.h"
  86
  87 char    dst_realm_buf[REALM_SZ];
  88 char    *dest_realm = NULL;
  89 int     use_kerberos = 1;
  90 CREDENTIALS     cred;
  91 Key_schedule    schedule;
  92 extern  char    *krb_realmofhost();
  93 #ifdef CRYPT
  94 int     doencrypt = 0;
  95 #define OPTIONS "46dfKk:prtx"
  96 #else
  97 #define OPTIONS "46dfKk:prt"
  98 #endif
  99 #else
 100 #define OPTIONS "46dfprt"
 101 #endif
 102
 103 struct passwd *pwd;
 104 u_short port;
 105 uid_t   userid;
 106 int errs, rem;
 107 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 108 int family = PF_UNSPEC;
 109
 110 static int argc_copy;
 111 static char **argv_copy;
 112
 113 #define CMDNEEDS        64
 114 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 115
 116 #ifdef KERBEROS
 117 int      kerberos(char **, char *, char *, char *);
 118 void     oldw(const char *, ...) __printflike(1, 2);
 119 #endif
 120 int      response(void);
 121 void     rsource(char *, struct stat *);
 122 void     run_err(const char *, ...) __printflike(1, 2);
 123 void     sink(int, char *[]);
 124 void     source(int, char *[]);
 125 void     tolocal(int, char *[]);
 126 void     toremote(char *, int, char *[]);
 127 void     usage(void);
 128
 129 int
 130 main(int argc, char *argv[])
 131 {
 132         struct servent *sp;
 133         int ch, fflag, i, tflag;
 134         char *targ, *shell;
 135 #ifdef KERBEROS
 136         char *k;
 137 #endif
 138
 139         /*
 140          * Prepare for execing ourselves.
 141          */
 142         argc_copy = argc + 1;
 143         argv_copy = malloc((argc_copy + 1) * sizeof(*argv_copy));
 144         if (argv_copy == NULL)
 145                 err(1, "malloc");
 146         argv_copy[0] = argv[0];
 147         argv_copy[1] = "-K";
 148         for (i = 1; i < argc; ++i) {
 149                 argv_copy[i + 1] = strdup(argv[i]);
 150                 if (argv_copy[i + 1] == NULL)
 151                         errx(1, "strdup: out of memory");
 152         }
 153         argv_copy[argc + 1] = NULL;
 154
 155         fflag = tflag = 0;
 156         while ((ch = getopt(argc, argv, OPTIONS)) != -1)
 157                 switch(ch) {                    /* User-visible flags. */
 158                 case '4':
 159                         family = PF_INET;
 160                         break;
 161
 162                 case '6':
 163                         family = PF_INET6;
 164                         break;
 165
 166                 case 'K':
 167 #ifdef KERBEROS
 168                         use_kerberos = 0;
 169 #endif
 170                         break;
 171 #ifdef  KERBEROS
 172                 case 'k':
 173                         dest_realm = dst_realm_buf;
 174                         (void)strncpy(dst_realm_buf, optarg, REALM_SZ - 1);
 175                         dst_realm_buf[REALM_SZ - 1] = '\0';
 176                         break;
 177 #ifdef CRYPT
 178                 case 'x':
 179                         doencrypt = 1;
 180                         /* des_set_key(cred.session, schedule); */
 181                         break;
 182 #endif
 183 #endif
 184                 case 'p':
 185                         pflag = 1;
 186                         break;
 187                 case 'r':
 188                         iamrecursive = 1;
 189                         break;
 190                                                 /* Server options. */
 191                 case 'd':
 192                         targetshouldbedirectory = 1;
 193                         break;
 194                 case 'f':                       /* "from" */
 195                         iamremote = 1;
 196                         fflag = 1;
 197                         break;
 198                 case 't':                       /* "to" */
 199                         iamremote = 1;
 200                         tflag = 1;
 201                         break;
 202                 case '?':
 203                 default:
 204                         usage();
 205                 }
 206         argc -= optind;
 207         argv += optind;
 208
 209 #ifdef KERBEROS
 210         k = auth_getval("auth_list");
 211         if (k && !strstr(k, "kerberos"))
 212             use_kerberos = 0;
 213         if (use_kerberos) {
 214 #ifdef CRYPT
 215                 shell = doencrypt ? "ekshell" : "kshell";
 216 #else
 217                 shell = "kshell";
 218 #endif
 219                 if ((sp = getservbyname(shell, "tcp")) == NULL) {
 220                         use_kerberos = 0;
 221                         oldw("can't get entry for %s/tcp service", shell);
 222                         sp = getservbyname(shell = "shell", "tcp");
 223                 }
 224         } else
 225                 sp = getservbyname(shell = "shell", "tcp");
 226 #else
 227         sp = getservbyname(shell = "shell", "tcp");
 228 #endif
 229         if (sp == NULL)
 230                 errx(1, "%s/tcp: unknown service", shell);
 231         port = sp->s_port;
 232
 233         if ((pwd = getpwuid(userid = getuid())) == NULL)
 234                 errx(1, "unknown user %d", (int)userid);
 235
 236         rem = STDIN_FILENO;             /* XXX */
 237
 238         if (fflag) {                    /* Follow "protocol", send data. */
 239                 (void)response();
 240                 (void)setuid(userid);
 241                 source(argc, argv);
 242                 exit(errs);
 243         }
 244
 245         if (tflag) {                    /* Receive data. */
 246                 (void)setuid(userid);
 247                 sink(argc, argv);
 248                 exit(errs);
 249         }
 250
 251         if (argc < 2)
 252                 usage();
 253         if (argc > 2)
 254                 targetshouldbedirectory = 1;
 255
 256         rem = -1;
 257         /* Command to be executed on remote system using "rsh". */
 258 #ifdef  KERBEROS
 259         (void)snprintf(cmd, sizeof(cmd),
 260             "rcp%s%s%s%s", iamrecursive ? " -r" : "",
 261 #ifdef CRYPT
 262             (doencrypt && use_kerberos ? " -x" : ""),
 263 #else
 264             "",
 265 #endif
 266             pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");
 267 #else
 268         (void)snprintf(cmd, sizeof(cmd), "rcp%s%s%s",
 269             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 270             targetshouldbedirectory ? " -d" : "");
 271 #endif
 272
 273         (void)signal(SIGPIPE, lostconn);
 274
 275         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 276                 toremote(targ, argc, argv);
 277         else {
 278                 tolocal(argc, argv);            /* Dest is local host. */
 279                 if (targetshouldbedirectory)
 280                         verifydir(argv[argc - 1]);
 281         }
 282         exit(errs);
 283 }
 284
 285 void
 286 toremote(char *targ, int argc, char *argv[])
 287 {
 288         int i, len, tos;
 289         char *bp, *host, *src, *suser, *thost, *tuser;
 290
 291         *targ++ = 0;
 292         if (*targ == 0)
 293                 targ = ".";
 294
 295         if ((thost = strchr(argv[argc - 1], '@'))) {
 296                 /* user@host */
 297                 *thost++ = 0;
 298                 tuser = argv[argc - 1];
 299                 if (*tuser == '\0')
 300                         tuser = NULL;
 301                 else if (!okname(tuser))
 302                         exit(1);
 303         } else {
 304                 thost = argv[argc - 1];
 305                 tuser = NULL;
 306         }
 307
 308         for (i = 0; i < argc - 1; i++) {
 309                 src = colon(argv[i]);
 310                 if (src) {                      /* remote to remote */
 311                         *src++ = 0;
 312                         if (*src == 0)
 313                                 src = ".";
 314                         host = strchr(argv[i], '@');
 315                         len = strlen(_PATH_RSH) + strlen(argv[i]) +
 316                             strlen(src) + (tuser ? strlen(tuser) : 0) +
 317                             strlen(thost) + strlen(targ) + CMDNEEDS + 20;
 318                         if (!(bp = malloc(len)))
 319                                 err(1, "malloc");
 320                         if (host) {
 321                                 *host++ = 0;
 322                                 suser = argv[i];
 323                                 if (*suser == '\0')
 324                                         suser = pwd->pw_name;
 325                                 else if (!okname(suser)) {
 326                                         ++errs;
 327                                         continue;
 328                                 }
 329                                 (void)snprintf(bp, len,
 330                                     "%s %s -l %s -n %s %s '%s%s%s:%s'",
 331                                     _PATH_RSH, host, suser, cmd, src,
 332                                     tuser ? tuser : "", tuser ? "@" : "",
 333                                     thost, targ);
 334                         } else
 335                                 (void)snprintf(bp, len,
 336                                     "exec %s %s -n %s %s '%s%s%s:%s'",
 337                                     _PATH_RSH, argv[i], cmd, src,
 338                                     tuser ? tuser : "", tuser ? "@" : "",
 339                                     thost, targ);
 340                         (void)susystem(bp, userid);
 341                         (void)free(bp);
 342                 } else {                        /* local to remote */
 343                         if (rem == -1) {
 344                                 len = strlen(targ) + CMDNEEDS + 20;
 345                                 if (!(bp = malloc(len)))
 346                                         err(1, "malloc");
 347                                 (void)snprintf(bp, len, "%s -t %s", cmd, targ);
 348                                 host = thost;
 349 #ifdef KERBEROS
 350                                 if (use_kerberos)
 351                                         rem = kerberos(&host, bp,
 352                                             pwd->pw_name,
 353                                             tuser ? tuser : pwd->pw_name);
 354                                 else
 355 #endif
 356                                         rem = rcmd_af(&host, port,
 357                                             pwd->pw_name,
 358                                             tuser ? tuser : pwd->pw_name,
 359                                             bp, 0, family);
 360                                 if (rem < 0)
 361                                         exit(1);
 362                                 if (family == PF_INET) {
 363                                         tos = IPTOS_THROUGHPUT;
 364                                         if (setsockopt(rem, IPPROTO_IP, IP_TOS,
 365                                             &tos, sizeof(int)) < 0)
 366                                                 warn("TOS (ignored)");
 367                                 }
 368                                 if (response() < 0)
 369                                         exit(1);
 370                                 (void)free(bp);
 371                                 (void)setuid(userid);
 372                         }
 373                         source(1, argv+i);
 374                 }
 375         }
 376 }
 377
 378 void
 379 tolocal(int argc, char *argv[])
 380 {
 381         int i, len, tos;
 382         char *bp, *host, *src, *suser;
 383
 384         for (i = 0; i < argc - 1; i++) {
 385                 if (!(src = colon(argv[i]))) {          /* Local to local. */
 386                         len = strlen(_PATH_CP) + strlen(argv[i]) +
 387                             strlen(argv[argc - 1]) + 20;
 388                         if (!(bp = malloc(len)))
 389                                 err(1, "malloc");
 390                         (void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
 391                             iamrecursive ? " -PR" : "", pflag ? " -p" : "",
 392                             argv[i], argv[argc - 1]);
 393                         if (susystem(bp, userid))
 394                                 ++errs;
 395                         (void)free(bp);
 396                         continue;
 397                 }
 398                 *src++ = 0;
 399                 if (*src == 0)
 400                         src = ".";
 401                 if ((host = strchr(argv[i], '@')) == NULL) {
 402                         host = argv[i];
 403                         suser = pwd->pw_name;
 404                 } else {
 405                         *host++ = 0;
 406                         suser = argv[i];
 407                         if (*suser == '\0')
 408                                 suser = pwd->pw_name;
 409                         else if (!okname(suser)) {
 410                                 ++errs;
 411                                 continue;
 412                         }
 413                 }
 414                 len = strlen(src) + CMDNEEDS + 20;
 415                 if ((bp = malloc(len)) == NULL)
 416                         err(1, "malloc");
 417                 (void)snprintf(bp, len, "%s -f %s", cmd, src);
 418                 rem =
 419 #ifdef KERBEROS
 420                     use_kerberos ?
 421                         kerberos(&host, bp, pwd->pw_name, suser) :
 422 #endif
 423                         rcmd_af(&host, port, pwd->pw_name, suser, bp, 0,
 424                             family);
 425                 (void)free(bp);
 426                 if (rem < 0) {
 427                         ++errs;
 428                         continue;
 429                 }
 430                 (void)seteuid(userid);
 431                 if (family == PF_INET) {
 432                         tos = IPTOS_THROUGHPUT;
 433                         if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos,
 434                             sizeof(int)) < 0)
 435                                 warn("TOS (ignored)");
 436                 }
 437                 sink(1, argv + argc - 1);
 438                 (void)seteuid(0);
 439                 (void)close(rem);
 440                 rem = -1;
 441         }
 442 }
 443
 444 void
 445 source(int argc, char *argv[])
 446 {
 447         struct stat stb;
 448         static BUF buffer;
 449         BUF *bp;
 450         off_t i;
 451         int amt, fd, haderr, indx, result;
 452         char *last, *name, buf[BUFSIZ];
 453
 454         for (indx = 0; indx < argc; ++indx) {
 455                 name = argv[indx];
 456                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 457                         goto syserr;
 458                 if (fstat(fd, &stb)) {
 459 syserr:                 run_err("%s: %s", name, strerror(errno));
 460                         goto next;
 461                 }
 462                 switch (stb.st_mode & S_IFMT) {
 463                 case S_IFREG:
 464                         break;
 465                 case S_IFDIR:
 466                         if (iamrecursive) {
 467                                 rsource(name, &stb);
 468                                 goto next;
 469                         }
 470                         /* FALLTHROUGH */
 471                 default:
 472                         run_err("%s: not a regular file", name);
 473                         goto next;
 474                 }
 475                 if ((last = strrchr(name, '/')) == NULL)
 476                         last = name;
 477                 else
 478                         ++last;
 479                 if (pflag) {
 480                         /*
 481                          * Make it compatible with possible future
 482                          * versions expecting microseconds.
 483                          */
 484                         (void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
 485                             (long)stb.st_mtimespec.tv_sec,
 486                             (long)stb.st_atimespec.tv_sec);
 487                         (void)write(rem, buf, strlen(buf));
 488                         if (response() < 0)
 489                                 goto next;
 490                 }
 491 #define MODEMASK        (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
 492                 (void)snprintf(buf, sizeof(buf), "C%04o %qd %s\n",
 493                     stb.st_mode & MODEMASK, stb.st_size, last);
 494                 (void)write(rem, buf, strlen(buf));
 495                 if (response() < 0)
 496                         goto next;
 497                 if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
 498 next:                   (void)close(fd);
 499                         continue;
 500                 }
 501
 502                 /* Keep writing after an error so that we stay sync'd up. */
 503                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 504                         amt = bp->cnt;
 505                         if (i + amt > stb.st_size)
 506                                 amt = stb.st_size - i;
 507                         if (!haderr) {
 508                                 result = read(fd, bp->buf, amt);
 509                                 if (result != amt)
 510                                         haderr = result >= 0 ? EIO : errno;
 511                         }
 512                         if (haderr)
 513                                 (void)write(rem, bp->buf, amt);
 514                         else {
 515                                 result = write(rem, bp->buf, amt);
 516                                 if (result != amt)
 517                                         haderr = result >= 0 ? EIO : errno;
 518                         }
 519                 }
 520                 if (close(fd) && !haderr)
 521                         haderr = errno;
 522                 if (!haderr)
 523                         (void)write(rem, "", 1);
 524                 else
 525                         run_err("%s: %s", name, strerror(haderr));
 526                 (void)response();
 527         }
 528 }
 529
 530 void
 531 rsource(char *name, struct stat *statp)
 532 {
 533         DIR *dirp;
 534         struct dirent *dp;
 535         char *last, *vect[1], path[PATH_MAX];
 536
 537         if (!(dirp = opendir(name))) {
 538                 run_err("%s: %s", name, strerror(errno));
 539                 return;
 540         }
 541         last = strrchr(name, '/');
 542         if (last == 0)
 543                 last = name;
 544         else
 545                 last++;
 546         if (pflag) {
 547                 (void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
 548                     (long)statp->st_mtimespec.tv_sec,
 549                     (long)statp->st_atimespec.tv_sec);
 550                 (void)write(rem, path, strlen(path));
 551                 if (response() < 0) {
 552                         closedir(dirp);
 553                         return;
 554                 }
 555         }
 556         (void)snprintf(path, sizeof(path),
 557             "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
 558         (void)write(rem, path, strlen(path));
 559         if (response() < 0) {
 560                 closedir(dirp);
 561                 return;
 562         }
 563         while ((dp = readdir(dirp))) {
 564                 if (dp->d_ino == 0)
 565                         continue;
 566                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 567                         continue;
 568                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path)) {
 569                         run_err("%s/%s: name too long", name, dp->d_name);
 570                         continue;
 571                 }
 572                 (void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
 573                 vect[0] = path;
 574                 source(1, vect);
 575         }
 576         (void)closedir(dirp);
 577         (void)write(rem, "E\n", 2);
 578         (void)response();
 579 }
 580
 581 void
 582 sink(int argc, char *argv[])
 583 {
 584         static BUF buffer;
 585         struct stat stb;
 586         struct timeval tv[2];
 587         enum { YES, NO, DISPLAYED } wrerr;
 588         BUF *bp;
 589         off_t i, j, size;
 590         int amt, count, exists, first, mask, mode, ofd, omode;
 591         int setimes, targisdir, wrerrno = 0;
 592         char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ];
 593
 594 #define atime   tv[0]
 595 #define mtime   tv[1]
 596 #define SCREWUP(str)    { why = str; goto screwup; }
 597
 598         setimes = targisdir = 0;
 599         mask = umask(0);
 600         if (!pflag)
 601                 (void)umask(mask);
 602         if (argc != 1) {
 603                 run_err("ambiguous target");
 604                 exit(1);
 605         }
 606         targ = *argv;
 607         if (targetshouldbedirectory)
 608                 verifydir(targ);
 609         (void)write(rem, "", 1);
 610         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 611                 targisdir = 1;
 612         for (first = 1;; first = 0) {
 613                 cp = buf;
 614                 if (read(rem, cp, 1) <= 0)
 615                         return;
 616                 if (*cp++ == '\n')
 617                         SCREWUP("unexpected <newline>");
 618                 do {
 619                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
 620                                 SCREWUP("lost connection");
 621                         *cp++ = ch;
 622                 } while (cp < &buf[BUFSIZ - 1] && ch != '\n');
 623                 *cp = 0;
 624
 625                 if (buf[0] == '\01' || buf[0] == '\02') {
 626                         if (iamremote == 0)
 627                                 (void)write(STDERR_FILENO,
 628                                     buf + 1, strlen(buf + 1));
 629                         if (buf[0] == '\02')
 630                                 exit(1);
 631                         ++errs;
 632                         continue;
 633                 }
 634                 if (buf[0] == 'E') {
 635                         (void)write(rem, "", 1);
 636                         return;
 637                 }
 638
 639                 if (ch == '\n')
 640                         *--cp = 0;
 641
 642                 cp = buf;
 643                 if (*cp == 'T') {
 644                         setimes++;
 645                         cp++;
 646                         mtime.tv_sec = strtol(cp, &cp, 10);
 647                         if (!cp || *cp++ != ' ')
 648                                 SCREWUP("mtime.sec not delimited");
 649                         mtime.tv_usec = strtol(cp, &cp, 10);
 650                         if (!cp || *cp++ != ' ')
 651                                 SCREWUP("mtime.usec not delimited");
 652                         atime.tv_sec = strtol(cp, &cp, 10);
 653                         if (!cp || *cp++ != ' ')
 654                                 SCREWUP("atime.sec not delimited");
 655                         atime.tv_usec = strtol(cp, &cp, 10);
 656                         if (!cp || *cp++ != '\0')
 657                                 SCREWUP("atime.usec not delimited");
 658                         (void)write(rem, "", 1);
 659                         continue;
 660                 }
 661                 if (*cp != 'C' && *cp != 'D') {
 662                         /*
 663                          * Check for the case "rcp remote:foo\* local:bar".
 664                          * In this case, the line "No match." can be returned
 665                          * by the shell before the rcp command on the remote is
 666                          * executed so the ^Aerror_message convention isn't
 667                          * followed.
 668                          */
 669                         if (first) {
 670                                 run_err("%s", cp);
 671                                 exit(1);
 672                         }
 673                         SCREWUP("expected control record");
 674                 }
 675                 mode = 0;
 676                 for (++cp; cp < buf + 5; cp++) {
 677                         if (*cp < '0' || *cp > '7')
 678                                 SCREWUP("bad mode");
 679                         mode = (mode << 3) | (*cp - '0');
 680                 }
 681                 if (*cp++ != ' ')
 682                         SCREWUP("mode not delimited");
 683
 684                 for (size = 0; isdigit(*cp);)
 685                         size = size * 10 + (*cp++ - '0');
 686                 if (*cp++ != ' ')
 687                         SCREWUP("size not delimited");
 688                 if (targisdir) {
 689                         static char *namebuf = NULL;
 690                         static size_t cursize;
 691                         size_t need;
 692
 693                         need = strlen(targ) + strlen(cp) + 250;
 694                         if (need > cursize) {
 695                                 if (namebuf != NULL)
 696                                         free(namebuf);
 697                                 if (!(namebuf = malloc(need)))
 698                                         run_err("%s", strerror(errno));
 699                                 cursize = need;
 700                         }
 701                         (void)snprintf(namebuf, need, "%s%s%s", targ,
 702                             *targ ? "/" : "", cp);
 703                         np = namebuf;
 704                 } else
 705                         np = targ;
 706                 exists = stat(np, &stb) == 0;
 707                 if (buf[0] == 'D') {
 708                         int mod_flag = pflag;
 709                         if (exists) {
 710                                 if (!S_ISDIR(stb.st_mode)) {
 711                                         errno = ENOTDIR;
 712                                         goto bad;
 713                                 }
 714                                 if (pflag)
 715                                         (void)chmod(np, mode);
 716                         } else {
 717                                 /* Handle copying from a read-only directory */
 718                                 mod_flag = 1;
 719                                 if (mkdir(np, mode | S_IRWXU) < 0)
 720                                         goto bad;
 721                         }
 722                         vect[0] = np;
 723                         sink(1, vect);
 724                         if (setimes) {
 725                                 setimes = 0;
 726                                 if (utimes(np, tv) < 0)
 727                                     run_err("%s: set times: %s",
 728                                         np, strerror(errno));
 729                         }
 730                         if (mod_flag)
 731                                 (void)chmod(np, mode);
 732                         continue;
 733                 }
 734                 omode = mode;
 735                 mode |= S_IWRITE;
 736                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 737 bad:                    run_err("%s: %s", np, strerror(errno));
 738                         continue;
 739                 }
 740                 (void)write(rem, "", 1);
 741                 if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
 742                         (void)close(ofd);
 743                         continue;
 744                 }
 745                 cp = bp->buf;
 746                 wrerr = NO;
 747                 for (count = i = 0; i < size; i += BUFSIZ) {
 748                         amt = BUFSIZ;
 749                         if (i + amt > size)
 750                                 amt = size - i;
 751                         count += amt;
 752                         do {
 753                                 j = read(rem, cp, amt);
 754                                 if (j <= 0) {
 755                                         run_err("%s", j ? strerror(errno) :
 756                                             "dropped connection");
 757                                         exit(1);
 758                                 }
 759                                 amt -= j;
 760                                 cp += j;
 761                         } while (amt > 0);
 762                         if (count == bp->cnt) {
 763                                 /* Keep reading so we stay sync'd up. */
 764                                 if (wrerr == NO) {
 765                                         j = write(ofd, bp->buf, count);
 766                                         if (j != count) {
 767                                                 wrerr = YES;
 768                                                 wrerrno = j >= 0 ? EIO : errno;
 769                                         }
 770                                 }
 771                                 count = 0;
 772                                 cp = bp->buf;
 773                         }
 774                 }
 775                 if (count != 0 && wrerr == NO &&
 776                     (j = write(ofd, bp->buf, count)) != count) {
 777                         wrerr = YES;
 778                         wrerrno = j >= 0 ? EIO : errno;
 779                 }
 780                 if (ftruncate(ofd, size)) {
 781                         run_err("%s: truncate: %s", np, strerror(errno));
 782                         wrerr = DISPLAYED;
 783                 }
 784                 if (pflag) {
 785                         if (exists || omode != mode)
 786                                 if (fchmod(ofd, omode))
 787                                         run_err("%s: set mode: %s",
 788                                             np, strerror(errno));
 789                 } else {
 790                         if (!exists && omode != mode)
 791                                 if (fchmod(ofd, omode & ~mask))
 792                                         run_err("%s: set mode: %s",
 793                                             np, strerror(errno));
 794                 }
 795                 (void)close(ofd);
 796                 (void)response();
 797                 if (setimes && wrerr == NO) {
 798                         setimes = 0;
 799                         if (utimes(np, tv) < 0) {
 800                                 run_err("%s: set times: %s",
 801                                     np, strerror(errno));
 802                                 wrerr = DISPLAYED;
 803                         }
 804                 }
 805                 switch(wrerr) {
 806                 case YES:
 807                         run_err("%s: %s", np, strerror(wrerrno));
 808                         break;
 809                 case NO:
 810                         (void)write(rem, "", 1);
 811                         break;
 812                 case DISPLAYED:
 813                         break;
 814                 }
 815         }
 816 screwup:
 817         run_err("protocol error: %s", why);
 818         exit(1);
 819 }
 820
 821 #ifdef KERBEROS
 822 int
 823 kerberos(char **host, char *bp, char *locuser, char *user)
 824 {
 825         if (use_kerberos) {
 826                 setuid(getuid());
 827                 rem = KSUCCESS;
 828                 errno = 0;
 829                 if (dest_realm == NULL)
 830                         dest_realm = krb_realmofhost(*host);
 831                 rem =
 832 #ifdef CRYPT
 833                     doencrypt ?
 834                         krcmd_mutual(host,
 835                             port, user, bp, 0, dest_realm, &cred, schedule) :
 836 #endif
 837                         krcmd(host, port, user, bp, 0, dest_realm);
 838
 839                 if (rem < 0) {
 840                         if (errno == ECONNREFUSED)
 841                             oldw("remote host doesn't support Kerberos");
 842                         else if (errno == ENOENT)
 843                             oldw("can't provide Kerberos authentication data");
 844                         execv(_PATH_RCP, argv_copy);
 845                         err(1, "execv: %s", _PATH_RCP);
 846                 }
 847         } else {
 848 #ifdef CRYPT
 849                 if (doencrypt)
 850                         errx(1,
 851                            "the -x option requires Kerberos authentication");
 852 #endif
 853                 rem = rcmd_af(host, port, locuser, user, bp, 0, family);
 854         }
 855         return (rem);
 856 }
 857 #endif /* KERBEROS */
 858
 859 int
 860 response(void)
 861 {
 862         char ch, *cp, resp, rbuf[BUFSIZ];
 863
 864         if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
 865                 lostconn(0);
 866
 867         cp = rbuf;
 868         switch(resp) {
 869         case 0:                         /* ok */
 870                 return (0);
 871         default:
 872                 *cp++ = resp;
 873                 /* FALLTHROUGH */
 874         case 1:                         /* error, followed by error msg */
 875         case 2:                         /* fatal error, "" */
 876                 do {
 877                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
 878                                 lostconn(0);
 879                         *cp++ = ch;
 880                 } while (cp < &rbuf[BUFSIZ] && ch != '\n');
 881
 882                 if (!iamremote)
 883                         (void)write(STDERR_FILENO, rbuf, cp - rbuf);
 884                 ++errs;
 885                 if (resp == 1)
 886                         return (-1);
 887                 exit(1);
 888         }
 889         /* NOTREACHED */
 890 }
 891
 892 void
 893 usage(void)
 894 {
 895 #ifdef KERBEROS
 896 #ifdef CRYPT
 897         (void)fprintf(stderr, "%s\n%s\n",
 898             "usage: rcp [-46Kpx] [-k realm] f1 f2",
 899             "       rcp [-46Kprx] [-k realm] f1 ... fn directory");
 900 #else
 901         (void)fprintf(stderr, "%s\n%s\n",
 902             "usage: rcp [-46Kp] [-k realm] f1 f2",
 903             "       rcp [-46Kpr] [-k realm] f1 ... fn directory");
 904 #endif
 905 #else
 906         (void)fprintf(stderr, "%s\n%s\n",
 907             "usage: rcp [-46p] f1 f2",
 908             "       rcp [-46pr] f1 ... fn directory");
 909 #endif
 910         exit(1);
 911 }
 912
 913 #include <stdarg.h>
 914
 915 #ifdef KERBEROS
 916 void
 917 oldw(const char *fmt, ...)
 918 {
 919         va_list ap;
 920         va_start(ap, fmt);
 921         (void)fprintf(stderr, "rcp: ");
 922         (void)vfprintf(stderr, fmt, ap);
 923         (void)fprintf(stderr, ", using standard rcp\n");
 924         va_end(ap);
 925 }
 926 #endif
 927
 928 void
 929 run_err(const char *fmt, ...)
 930 {
 931         static FILE *fp;
 932         va_list ap;
 933         va_start(ap, fmt);
 934
 935         ++errs;
 936         if (fp == NULL && !(fp = fdopen(rem, "w")))
 937                 return;
 938         (void)fprintf(fp, "%c", 0x01);
 939         (void)fprintf(fp, "rcp: ");
 940         (void)vfprintf(fp, fmt, ap);
 941         (void)fprintf(fp, "\n");
 942         (void)fflush(fp);
 943
 944         if (!iamremote)
 945                 vwarnx(fmt, ap);
 946
 947         va_end(ap);
 948 }