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