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