crypto/heimdal/appl/rcp/rcp.c

   1 /*
   2  * Copyright (c) 1983, 1990, 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include "rcp_locl.h"
  31 #include <getarg.h>
  32
  33 #define RSH_PROGRAM "rsh"
  34
  35 struct  passwd *pwd;
  36 uid_t   userid;
  37 int     errs, remin, remout;
  38 int     pflag, iamremote, iamrecursive, targetshouldbedirectory;
  39 int     doencrypt, noencrypt;
  40 int     usebroken, usekrb4, usekrb5, forwardtkt;
  41 char    *port;
  42 int     eflag = 0;
  43
  44 #define CMDNEEDS        64
  45 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
  46
  47 int      response (void);
  48 void     rsource (char *, struct stat *);
  49 void     sink (int, char *[]);
  50 void     source (int, char *[]);
  51 void     tolocal (int, char *[]);
  52 void     toremote (char *, int, char *[]);
  53
  54 int      do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
  55
  56 static int fflag, tflag;
  57
  58 static int version_flag, help_flag;
  59
  60 struct getargs args[] = {
  61     { NULL,     '4', arg_flag,          &usekrb4,       "use Kerberos 4 authentication" },
  62     { NULL,     '5', arg_flag,          &usekrb5,       "use Kerberos 5 authentication" },
  63     { NULL,     'F', arg_flag,          &forwardtkt,    "forward credentials" },
  64     { NULL,     'K', arg_flag,          &usebroken,     "use BSD authentication" },
  65     { NULL,     'P', arg_string,        &port,          "non-default port", "port" },
  66     { NULL,     'p', arg_flag,          &pflag, "preserve file permissions" },
  67     { NULL,     'r', arg_flag,          &iamrecursive,  "recursive mode" },
  68     { NULL,     'x', arg_flag,          &doencrypt,     "use encryption" },
  69     { NULL,     'z', arg_flag,          &noencrypt,     "don't encrypt" },
  70     { NULL,     'd', arg_flag,          &targetshouldbedirectory },
  71     { NULL,     'e', arg_flag,          &eflag,         "passed to rsh" },
  72     { NULL,     'f', arg_flag,          &fflag },
  73     { NULL,     't', arg_flag,          &tflag },
  74     { "version", 0,  arg_flag,          &version_flag },
  75     { "help",    0,  arg_flag,          &help_flag }
  76 };
  77
  78 static void
  79 usage (int ret)
  80 {
  81     arg_printusage (args,
  82                     sizeof(args) / sizeof(args[0]),
  83                     NULL,
  84                     "file1 file2|file... directory");
  85     exit (ret);
  86 }
  87
  88 int
  89 main(int argc, char **argv)
  90 {
  91         char *targ;
  92         int optind = 0;
  93
  94         setprogname(argv[0]);
  95         if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
  96                     &optind))
  97             usage (1);
  98         if(help_flag)
  99             usage(0);
 100         if (version_flag) {
 101             print_version (NULL);
 102             return 0;
 103         }
 104
 105         iamremote = (fflag || tflag);
 106
 107         argc -= optind;
 108         argv += optind;
 109
 110         if ((pwd = getpwuid(userid = getuid())) == NULL)
 111                 errx(1, "unknown user %d", (int)userid);
 112
 113         remin = STDIN_FILENO;           /* XXX */
 114         remout = STDOUT_FILENO;
 115
 116         if (fflag) {                    /* Follow "protocol", send data. */
 117                 (void)response();
 118                 source(argc, argv);
 119                 exit(errs);
 120         }
 121
 122         if (tflag) {                    /* Receive data. */
 123                 sink(argc, argv);
 124                 exit(errs);
 125         }
 126
 127         if (argc < 2)
 128             usage(1);
 129         if (argc > 2)
 130                 targetshouldbedirectory = 1;
 131
 132         remin = remout = -1;
 133         /* Command to be executed on remote system using "rsh". */
 134         snprintf(cmd, sizeof(cmd),
 135                  "rcp%s%s%s", iamrecursive ? " -r" : "",
 136                  pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");
 137
 138         signal(SIGPIPE, lostconn);
 139
 140         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 141                 toremote(targ, argc, argv);
 142         else {
 143                 tolocal(argc, argv);            /* Dest is local host. */
 144                 if (targetshouldbedirectory)
 145                         verifydir(argv[argc - 1]);
 146         }
 147         exit(errs);
 148 }
 149
 150 void
 151 toremote(char *targ, int argc, char **argv)
 152 {
 153         int i;
 154         char *bp, *host, *src, *suser, *thost, *tuser;
 155
 156         *targ++ = 0;
 157         if (*targ == 0)
 158                 targ = ".";
 159
 160         if ((thost = strchr(argv[argc - 1], '@')) != NULL) {
 161                 /* user@host */
 162                 *thost++ = 0;
 163                 tuser = argv[argc - 1];
 164                 if (*tuser == '\0')
 165                         tuser = NULL;
 166                 else if (!okname(tuser))
 167                         exit(1);
 168         } else {
 169                 thost = argv[argc - 1];
 170                 tuser = NULL;
 171         }
 172         thost = unbracket(thost);
 173
 174         for (i = 0; i < argc - 1; i++) {
 175                 src = colon(argv[i]);
 176                 if (src) {                      /* remote to remote */
 177                         int ret;
 178                         *src++ = 0;
 179                         if (*src == 0)
 180                                 src = ".";
 181                         host = strchr(argv[i], '@');
 182                         if (host) {
 183                                 *host++ = '\0';
 184                                 host = unbracket(host);
 185                                 suser = argv[i];
 186                                 if (*suser == '\0')
 187                                         suser = pwd->pw_name;
 188                                 else if (!okname(suser))
 189                                         continue;
 190                                 ret = asprintf(&bp,
 191                                     "%s%s %s -l %s -n %s %s '%s%s%s:%s'",
 192                                          _PATH_RSH, eflag ? " -e" : "",
 193                                          host, suser, cmd, src,
 194                                     tuser ? tuser : "", tuser ? "@" : "",
 195                                     thost, targ);
 196                         } else {
 197                                 host = unbracket(argv[i]);
 198                                 ret = asprintf(&bp,
 199                                          "exec %s%s %s -n %s %s '%s%s%s:%s'",
 200                                          _PATH_RSH, eflag ? " -e" : "",
 201                                          host, cmd, src,
 202                                          tuser ? tuser : "", tuser ? "@" : "",
 203                                          thost, targ);
 204                         }
 205                         if (ret == -1)
 206                                 err (1, "malloc");
 207                         susystem(bp);
 208                         free(bp);
 209                 } else {                        /* local to remote */
 210                         if (remin == -1) {
 211                                 if (asprintf(&bp, "%s -t %s", cmd, targ) == -1)
 212                                         err (1, "malloc");
 213                                 host = thost;
 214
 215                                 if (do_cmd(host, tuser, bp, &remin, &remout) < 0)
 216                                         exit(1);
 217
 218                                 if (response() < 0)
 219                                         exit(1);
 220                                 free(bp);
 221                         }
 222                         source(1, argv+i);
 223                 }
 224         }
 225 }
 226
 227 void
 228 tolocal(int argc, char **argv)
 229 {
 230         int i;
 231         char *bp, *host, *src, *suser;
 232
 233         for (i = 0; i < argc - 1; i++) {
 234                 int ret;
 235
 236                 if (!(src = colon(argv[i]))) {          /* Local to local. */
 237                         ret = asprintf(&bp, "exec %s%s%s %s %s", _PATH_CP,
 238                             iamrecursive ? " -PR" : "", pflag ? " -p" : "",
 239                             argv[i], argv[argc - 1]);
 240                         if (ret == -1)
 241                                 err (1, "malloc");
 242                         if (susystem(bp))
 243                                 ++errs;
 244                         free(bp);
 245                         continue;
 246                 }
 247                 *src++ = 0;
 248                 if (*src == 0)
 249                         src = ".";
 250                 if ((host = strchr(argv[i], '@')) == NULL) {
 251                         host = argv[i];
 252                         suser = pwd->pw_name;
 253                 } else {
 254                         *host++ = 0;
 255                         suser = argv[i];
 256                         if (*suser == '\0')
 257                                 suser = pwd->pw_name;
 258                         else if (!okname(suser))
 259                                 continue;
 260                 }
 261                 ret = asprintf(&bp, "%s -f %s", cmd, src);
 262                 if (ret == -1)
 263                         err (1, "malloc");
 264                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 265                         free(bp);
 266                         ++errs;
 267                         continue;
 268                 }
 269                 free(bp);
 270                 sink(1, argv + argc - 1);
 271                 close(remin);
 272                 remin = remout = -1;
 273         }
 274 }
 275
 276 void
 277 source(int argc, char **argv)
 278 {
 279         struct stat stb;
 280         static BUF buffer;
 281         BUF *bp;
 282         off_t i;
 283         off_t amt;
 284         int fd, haderr, indx, result;
 285         char *last, *name, buf[BUFSIZ];
 286
 287         for (indx = 0; indx < argc; ++indx) {
 288                 name = argv[indx];
 289                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 290                         goto syserr;
 291                 if (fstat(fd, &stb)) {
 292 syserr:                 run_err("%s: %s", name, strerror(errno));
 293                         goto next;
 294                 }
 295                 if (S_ISDIR(stb.st_mode) && iamrecursive) {
 296                         rsource(name, &stb);
 297                         goto next;
 298                 } else if (!S_ISREG(stb.st_mode)) {
 299                         run_err("%s: not a regular file", name);
 300                         goto next;
 301                 }
 302                 if ((last = strrchr(name, '/')) == NULL)
 303                         last = name;
 304                 else
 305                         ++last;
 306                 if (pflag) {
 307                         /*
 308                          * Make it compatible with possible future
 309                          * versions expecting microseconds.
 310                          */
 311                         snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
 312                             (long)stb.st_mtime,
 313                             (long)stb.st_atime);
 314                         write(remout, buf, strlen(buf));
 315                         if (response() < 0)
 316                                 goto next;
 317                 }
 318 #undef MODEMASK
 319 #define MODEMASK        (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)
 320                 snprintf(buf, sizeof(buf), "C%04o %lu %s\n",
 321                          (unsigned int)(stb.st_mode & MODEMASK),
 322                          (unsigned long)stb.st_size,
 323                          last);
 324                 write(remout, buf, strlen(buf));
 325                 if (response() < 0)
 326                         goto next;
 327                 if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
 328 next:                   close(fd);
 329                         continue;
 330                 }
 331
 332                 /* Keep writing after an error so that we stay sync'd up. */
 333                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 334                         amt = bp->cnt;
 335                         if (i + amt > stb.st_size)
 336                                 amt = stb.st_size - i;
 337                         if (!haderr) {
 338                                 result = read(fd, bp->buf, (size_t)amt);
 339                                 if (result != amt)
 340                                         haderr = result >= 0 ? EIO : errno;
 341                         }
 342                         if (haderr)
 343                                 write(remout, bp->buf, amt);
 344                         else {
 345                                 result = write(remout, bp->buf, (size_t)amt);
 346                                 if (result != amt)
 347                                         haderr = result >= 0 ? EIO : errno;
 348                         }
 349                 }
 350                 if (close(fd) && !haderr)
 351                         haderr = errno;
 352                 if (!haderr)
 353                         write(remout, "", 1);
 354                 else
 355                         run_err("%s: %s", name, strerror(haderr));
 356                 response();
 357         }
 358 }
 359
 360 void
 361 rsource(char *name, struct stat *statp)
 362 {
 363         DIR *dirp;
 364         struct dirent *dp;
 365         char *last, *vect[1], path[MAXPATHLEN];
 366
 367         if (!(dirp = opendir(name))) {
 368                 run_err("%s: %s", name, strerror(errno));
 369                 return;
 370         }
 371         last = strrchr(name, '/');
 372         if (last == 0)
 373                 last = name;
 374         else
 375                 last++;
 376         if (pflag) {
 377                 snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
 378                     (long)statp->st_mtime,
 379                     (long)statp->st_atime);
 380                 write(remout, path, strlen(path));
 381                 if (response() < 0) {
 382                         closedir(dirp);
 383                         return;
 384                 }
 385         }
 386         snprintf(path, sizeof(path),
 387                  "D%04o %d %s\n",
 388                  (unsigned int)(statp->st_mode & MODEMASK), 0, last);
 389         write(remout, path, strlen(path));
 390         if (response() < 0) {
 391                 closedir(dirp);
 392                 return;
 393         }
 394         while ((dp = readdir(dirp)) != NULL) {
 395                 if (dp->d_ino == 0)
 396                         continue;
 397                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 398                         continue;
 399                 if (strlen(name) + 1 + strlen(dp->d_name) >= MAXPATHLEN - 1) {
 400                         run_err("%s/%s: name too long", name, dp->d_name);
 401                         continue;
 402                 }
 403                 snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
 404                 vect[0] = path;
 405                 source(1, vect);
 406         }
 407         closedir(dirp);
 408         write(remout, "E\n", 2);
 409         response();
 410 }
 411
 412 void
 413 sink(int argc, char **argv)
 414 {
 415         static BUF buffer;
 416         struct stat stb;
 417         struct timeval tv[2];
 418         enum { YES, NO, DISPLAYED } wrerr;
 419         BUF *bp;
 420         off_t i, j, size;
 421         int amt, count, exists, first, mask, mode, ofd, omode;
 422         int setimes, targisdir, wrerrno = 0;
 423         char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ];
 424
 425 #define atime   tv[0]
 426 #define mtime   tv[1]
 427 #define SCREWUP(str)    { why = str; goto screwup; }
 428
 429         setimes = targisdir = 0;
 430         mask = umask(0);
 431         if (!pflag)
 432                 umask(mask);
 433         if (argc != 1) {
 434                 run_err("ambiguous target");
 435                 exit(1);
 436         }
 437         targ = *argv;
 438         if (targetshouldbedirectory)
 439                 verifydir(targ);
 440         write(remout, "", 1);
 441         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 442                 targisdir = 1;
 443         for (first = 1;; first = 0) {
 444                 cp = buf;
 445                 if (read(remin, cp, 1) <= 0)
 446                         return;
 447                 if (*cp++ == '\n')
 448                         SCREWUP("unexpected <newline>");
 449                 do {
 450                         if (read(remin, &ch, sizeof(ch)) != sizeof(ch))
 451                                 SCREWUP("lost connection");
 452                         *cp++ = ch;
 453                 } while (cp < &buf[BUFSIZ - 1] && ch != '\n');
 454                 *cp = 0;
 455
 456                 if (buf[0] == '\01' || buf[0] == '\02') {
 457                         if (iamremote == 0)
 458                                 write(STDERR_FILENO,
 459                                     buf + 1, strlen(buf + 1));
 460                         if (buf[0] == '\02')
 461                                 exit(1);
 462                         ++errs;
 463                         continue;
 464                 }
 465                 if (buf[0] == 'E') {
 466                         write(remout, "", 1);
 467                         return;
 468                 }
 469
 470                 if (ch == '\n')
 471                         *--cp = 0;
 472
 473                 cp = buf;
 474                 if (*cp == 'T') {
 475                         setimes++;
 476                         cp++;
 477                         mtime.tv_sec = strtol(cp, &cp, 10);
 478                         if (!cp || *cp++ != ' ')
 479                                 SCREWUP("mtime.sec not delimited");
 480                         mtime.tv_usec = strtol(cp, &cp, 10);
 481                         if (!cp || *cp++ != ' ')
 482                                 SCREWUP("mtime.usec not delimited");
 483                         atime.tv_sec = strtol(cp, &cp, 10);
 484                         if (!cp || *cp++ != ' ')
 485                                 SCREWUP("atime.sec not delimited");
 486                         atime.tv_usec = strtol(cp, &cp, 10);
 487                         if (!cp || *cp++ != '\0')
 488                                 SCREWUP("atime.usec not delimited");
 489                         write(remout, "", 1);
 490                         continue;
 491                 }
 492                 if (*cp != 'C' && *cp != 'D') {
 493                         /*
 494                          * Check for the case "rcp remote:foo\* local:bar".
 495                          * In this case, the line "No match." can be returned
 496                          * by the shell before the rcp command on the remote is
 497                          * executed so the ^Aerror_message convention isn't
 498                          * followed.
 499                          */
 500                         if (first) {
 501                                 run_err("%s", cp);
 502                                 exit(1);
 503                         }
 504                         SCREWUP("expected control record");
 505                 }
 506                 mode = 0;
 507                 for (++cp; cp < buf + 5; cp++) {
 508                         if (*cp < '0' || *cp > '7')
 509                                 SCREWUP("bad mode");
 510                         mode = (mode << 3) | (*cp - '0');
 511                 }
 512                 if (*cp++ != ' ')
 513                         SCREWUP("mode not delimited");
 514
 515                 for (size = 0; isdigit((unsigned char)*cp);)
 516                         size = size * 10 + (*cp++ - '0');
 517                 if (*cp++ != ' ')
 518                         SCREWUP("size not delimited");
 519                 if (targisdir) {
 520                         static char *namebuf;
 521                         static int cursize;
 522                         size_t need;
 523
 524                         need = strlen(targ) + strlen(cp) + 250;
 525                         if (need > cursize) {
 526                                 if (!(namebuf = malloc(need)))
 527                                         run_err("%s", strerror(errno));
 528                         }
 529                         snprintf(namebuf, need, "%s%s%s", targ,
 530                             *targ ? "/" : "", cp);
 531                         np = namebuf;
 532                 } else
 533                         np = targ;
 534                 exists = stat(np, &stb) == 0;
 535                 if (buf[0] == 'D') {
 536                         int mod_flag = pflag;
 537                         if (exists) {
 538                                 if (!S_ISDIR(stb.st_mode)) {
 539                                         errno = ENOTDIR;
 540                                         goto bad;
 541                                 }
 542                                 if (pflag)
 543                                         chmod(np, mode);
 544                         } else {
 545                                 /* Handle copying from a read-only directory */
 546                                 mod_flag = 1;
 547                                 if (mkdir(np, mode | S_IRWXU) < 0)
 548                                         goto bad;
 549                         }
 550                         vect[0] = np;
 551                         sink(1, vect);
 552                         if (setimes) {
 553                                 setimes = 0;
 554                                 if (utimes(np, tv) < 0)
 555                                     run_err("%s: set times: %s",
 556                                         np, strerror(errno));
 557                         }
 558                         if (mod_flag)
 559                                 chmod(np, mode);
 560                         continue;
 561                 }
 562                 omode = mode;
 563                 mode |= S_IWRITE;
 564                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 565 bad:                    run_err("%s: %s", np, strerror(errno));
 566                         continue;
 567                 }
 568                 write(remout, "", 1);
 569                 if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
 570                         close(ofd);
 571                         continue;
 572                 }
 573                 cp = bp->buf;
 574                 wrerr = NO;
 575                 for (count = i = 0; i < size; i += BUFSIZ) {
 576                         amt = BUFSIZ;
 577                         if (i + amt > size)
 578                                 amt = size - i;
 579                         count += amt;
 580                         if((j = net_read(remin, cp, amt)) != amt) {
 581                             run_err("%s", j ? strerror(errno) :
 582                                     "dropped connection");
 583                             exit(1);
 584                         }
 585                         amt -= j;
 586                         cp += j;
 587                         if (count == bp->cnt) {
 588                                 /* Keep reading so we stay sync'd up. */
 589                                 if (wrerr == NO) {
 590                                         j = write(ofd, bp->buf, (size_t)count);
 591                                         if (j != count) {
 592                                                 wrerr = YES;
 593                                                 wrerrno = j >= 0 ? EIO : errno;
 594                                         }
 595                                 }
 596                                 count = 0;
 597                                 cp = bp->buf;
 598                         }
 599                 }
 600                 if (count != 0 && wrerr == NO &&
 601                     (j = write(ofd, bp->buf, (size_t)count)) != count) {
 602                         wrerr = YES;
 603                         wrerrno = j >= 0 ? EIO : errno;
 604                 }
 605                 if (ftruncate(ofd, size)) {
 606                         run_err("%s: truncate: %s", np, strerror(errno));
 607                         wrerr = DISPLAYED;
 608                 }
 609                 if (pflag) {
 610                         if (exists || omode != mode)
 611                                 if (fchmod(ofd, omode))
 612                                         run_err("%s: set mode: %s",
 613                                             np, strerror(errno));
 614                 } else {
 615                         if (!exists && omode != mode)
 616                                 if (fchmod(ofd, omode & ~mask))
 617                                         run_err("%s: set mode: %s",
 618                                             np, strerror(errno));
 619                 }
 620                 close(ofd);
 621                 response();
 622                 if (setimes && wrerr == NO) {
 623                         setimes = 0;
 624                         if (utimes(np, tv) < 0) {
 625                                 run_err("%s: set times: %s",
 626                                     np, strerror(errno));
 627                                 wrerr = DISPLAYED;
 628                         }
 629                 }
 630                 switch(wrerr) {
 631                 case YES:
 632                         run_err("%s: %s", np, strerror(wrerrno));
 633                         break;
 634                 case NO:
 635                         write(remout, "", 1);
 636                         break;
 637                 case DISPLAYED:
 638                         break;
 639                 }
 640         }
 641 screwup:
 642         run_err("protocol error: %s", why);
 643         exit(1);
 644 }
 645
 646 int
 647 response(void)
 648 {
 649         char ch, *cp, resp, rbuf[BUFSIZ];
 650
 651         if (read(remin, &resp, sizeof(resp)) != sizeof(resp))
 652                 lostconn(0);
 653
 654         cp = rbuf;
 655         switch(resp) {
 656         case 0:                         /* ok */
 657                 return (0);
 658         default:
 659                 *cp++ = resp;
 660                 /* FALLTHROUGH */
 661         case 1:                         /* error, followed by error msg */
 662         case 2:                         /* fatal error, "" */
 663                 do {
 664                         if (read(remin, &ch, sizeof(ch)) != sizeof(ch))
 665                                 lostconn(0);
 666                         *cp++ = ch;
 667                 } while (cp < &rbuf[BUFSIZ] && ch != '\n');
 668
 669                 if (!iamremote)
 670                         write(STDERR_FILENO, rbuf, cp - rbuf);
 671                 ++errs;
 672                 if (resp == 1)
 673                         return (-1);
 674                 exit(1);
 675         }
 676         /* NOTREACHED */
 677 }
 678
 679 #include <stdarg.h>
 680
 681 void
 682 run_err(const char *fmt, ...)
 683 {
 684         static FILE *fp;
 685         va_list ap;
 686
 687         ++errs;
 688         if (fp == NULL && !(fp = fdopen(remout, "w")))
 689                 return;
 690         va_start(ap, fmt);
 691         fprintf(fp, "%c", 0x01);
 692         fprintf(fp, "rcp: ");
 693         vfprintf(fp, fmt, ap);
 694         fprintf(fp, "\n");
 695         fflush(fp);
 696         va_end(ap);
 697
 698         if (!iamremote) {
 699             va_start(ap, fmt);
 700             vwarnx(fmt, ap);
 701             va_end(ap);
 702         }
 703 }
 704
 705 /*
 706  * This function executes the given command as the specified user on the
 707  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 708  * assigns the input and output file descriptors on success.
 709  *
 710  * If it cannot create necessary pipes it exits with error message.
 711  */
 712
 713 int
 714 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 715 {
 716         int pin[2], pout[2], reserved[2];
 717
 718         /*
 719          * Reserve two descriptors so that the real pipes won't get
 720          * descriptors 0 and 1 because that will screw up dup2 below.
 721          */
 722         pipe(reserved);
 723
 724         /* Create a socket pair for communicating with rsh. */
 725         if (pipe(pin) < 0) {
 726                 perror("pipe");
 727                 exit(255);
 728         }
 729         if (pipe(pout) < 0) {
 730                 perror("pipe");
 731                 exit(255);
 732         }
 733
 734         /* Free the reserved descriptors. */
 735         close(reserved[0]);
 736         close(reserved[1]);
 737
 738         /* For a child to execute the command on the remote host using rsh. */
 739         if (fork() == 0) {
 740                 char *args[100];
 741                 unsigned int i;
 742
 743                 /* Child. */
 744                 close(pin[1]);
 745                 close(pout[0]);
 746                 dup2(pin[0], 0);
 747                 dup2(pout[1], 1);
 748                 close(pin[0]);
 749                 close(pout[1]);
 750
 751                 i = 0;
 752                 args[i++] = RSH_PROGRAM;
 753                 if (usekrb4)
 754                         args[i++] = "-4";
 755                 if (usekrb5)
 756                         args[i++] = "-5";
 757                 if (usebroken)
 758                         args[i++] = "-K";
 759                 if (doencrypt)
 760                         args[i++] = "-x";
 761                 if (forwardtkt)
 762                         args[i++] = "-F";
 763                 if (noencrypt)
 764                         args[i++] = "-z";
 765                 if (port != NULL) {
 766                         args[i++] = "-p";
 767                         args[i++] = port;
 768                 }
 769                 if (eflag)
 770                     args[i++] = "-e";
 771                 if (remuser != NULL) {
 772                         args[i++] = "-l";
 773                         args[i++] = remuser;
 774                 }
 775                 args[i++] = host;
 776                 args[i++] = cmd;
 777                 args[i++] = NULL;
 778
 779                 execvp(RSH_PROGRAM, args);
 780                 perror(RSH_PROGRAM);
 781                 exit(1);
 782         }
 783         /* Parent.  Close the other side, and return the local side. */
 784         close(pin[0]);
 785         *fdout = pin[1];
 786         close(pout[1]);
 787         *fdin = pout[0];
 788         return 0;
 789 }