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",      NULL },
  62     { NULL,     '5', arg_flag,   &usekrb5,      "use Kerberos 5 authentication",      NULL },
  63     { NULL,     'F', arg_flag,   &forwardtkt,   "forward credentials", NULL },
  64     { NULL,     'K', arg_flag,   &usebroken,    "use BSD authentication",
  65       NULL },
  66     { NULL,     'P', arg_string, &port,         "non-default port", "port" },
  67     { NULL,     'p', arg_flag,   &pflag,        "preserve file permissions",
  68       NULL },
  69     { NULL,     'r', arg_flag,   &iamrecursive, "recursive mode", NULL },
  70     { NULL,     'x', arg_flag,   &doencrypt,    "use encryption", NULL },
  71     { NULL,     'z', arg_flag,   &noencrypt,    "don't encrypt", NULL },
  72     { NULL,     'd', arg_flag,   &targetshouldbedirectory, NULL, NULL },
  73     { NULL,     'e', arg_flag,   &eflag,        "passed to rsh", NULL },
  74     { NULL,     'f', arg_flag,   &fflag,        NULL, NULL },
  75     { NULL,     't', arg_flag,   &tflag,        NULL, NULL },
  76     { "version", 0,  arg_flag,   &version_flag, NULL, NULL },
  77     { "help",    0,  arg_flag,   &help_flag,    NULL, NULL }
  78 };
  79
  80 static void
  81 usage (int ret)
  82 {
  83     arg_printusage (args,
  84                     sizeof(args) / sizeof(args[0]),
  85                     NULL,
  86                     "file1 file2|file... directory");
  87     exit (ret);
  88 }
  89
  90 int
  91 main(int argc, char **argv)
  92 {
  93         char *targ;
  94         int optind = 0;
  95
  96         setprogname(argv[0]);
  97         if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
  98                     &optind))
  99             usage (1);
 100         if(help_flag)
 101             usage(0);
 102         if (version_flag) {
 103             print_version (NULL);
 104             return 0;
 105         }
 106
 107         iamremote = (fflag || tflag);
 108
 109         argc -= optind;
 110         argv += optind;
 111
 112         if ((pwd = getpwuid(userid = getuid())) == NULL)
 113                 errx(1, "unknown user %d", (int)userid);
 114
 115         remin = STDIN_FILENO;           /* XXX */
 116         remout = STDOUT_FILENO;
 117
 118         if (fflag) {                    /* Follow "protocol", send data. */
 119                 (void)response();
 120                 source(argc, argv);
 121                 exit(errs);
 122         }
 123
 124         if (tflag) {                    /* Receive data. */
 125                 sink(argc, argv);
 126                 exit(errs);
 127         }
 128
 129         if (argc < 2)
 130             usage(1);
 131         if (argc > 2)
 132                 targetshouldbedirectory = 1;
 133
 134         remin = remout = -1;
 135         /* Command to be executed on remote system using "rsh". */
 136         snprintf(cmd, sizeof(cmd),
 137                  "rcp%s%s%s", iamrecursive ? " -r" : "",
 138                  pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");
 139
 140         signal(SIGPIPE, lostconn);
 141
 142         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 143                 toremote(targ, argc, argv);
 144         else {
 145                 tolocal(argc, argv);            /* Dest is local host. */
 146                 if (targetshouldbedirectory)
 147                         verifydir(argv[argc - 1]);
 148         }
 149         exit(errs);
 150 }
 151
 152 void
 153 toremote(char *targ, int argc, char **argv)
 154 {
 155         int i;
 156         char *bp, *host, *src, *suser, *thost, *tuser;
 157
 158         *targ++ = 0;
 159         if (*targ == 0)
 160                 targ = ".";
 161
 162         if ((thost = strchr(argv[argc - 1], '@')) != NULL) {
 163                 /* user@host */
 164                 *thost++ = 0;
 165                 tuser = argv[argc - 1];
 166                 if (*tuser == '\0')
 167                         tuser = NULL;
 168                 else if (!okname(tuser))
 169                         exit(1);
 170         } else {
 171                 thost = argv[argc - 1];
 172                 tuser = NULL;
 173         }
 174         thost = unbracket(thost);
 175
 176         for (i = 0; i < argc - 1; i++) {
 177                 src = colon(argv[i]);
 178                 if (src) {                      /* remote to remote */
 179                         int ret;
 180                         *src++ = 0;
 181                         if (*src == 0)
 182                                 src = ".";
 183                         host = strchr(argv[i], '@');
 184                         if (host) {
 185                                 *host++ = '\0';
 186                                 host = unbracket(host);
 187                                 suser = argv[i];
 188                                 if (*suser == '\0')
 189                                         suser = pwd->pw_name;
 190                                 else if (!okname(suser))
 191                                         continue;
 192                                 ret = asprintf(&bp,
 193                                     "%s%s %s -l %s -n %s %s '%s%s%s:%s'",
 194                                          _PATH_RSH, eflag ? " -e" : "",
 195                                          host, suser, cmd, src,
 196                                     tuser ? tuser : "", tuser ? "@" : "",
 197                                     thost, targ);
 198                         } else {
 199                                 host = unbracket(argv[i]);
 200                                 ret = asprintf(&bp,
 201                                          "exec %s%s %s -n %s %s '%s%s%s:%s'",
 202                                          _PATH_RSH, eflag ? " -e" : "",
 203                                          host, cmd, src,
 204                                          tuser ? tuser : "", tuser ? "@" : "",
 205                                          thost, targ);
 206                         }
 207                         if (ret == -1)
 208                                 err (1, "malloc");
 209                         susystem(bp);
 210                         free(bp);
 211                 } else {                        /* local to remote */
 212                         if (remin == -1) {
 213                                 if (asprintf(&bp, "%s -t %s", cmd, targ) == -1)
 214                                         err (1, "malloc");
 215                                 host = thost;
 216
 217                                 if (do_cmd(host, tuser, bp, &remin, &remout) < 0)
 218                                         exit(1);
 219
 220                                 if (response() < 0)
 221                                         exit(1);
 222                                 free(bp);
 223                         }
 224                         source(1, argv+i);
 225                 }
 226         }
 227 }
 228
 229 void
 230 tolocal(int argc, char **argv)
 231 {
 232         int i;
 233         char *bp, *host, *src, *suser;
 234
 235         for (i = 0; i < argc - 1; i++) {
 236                 int ret;
 237
 238                 if (!(src = colon(argv[i]))) {          /* Local to local. */
 239                         ret = asprintf(&bp, "exec %s%s%s %s %s", _PATH_CP,
 240                             iamrecursive ? " -PR" : "", pflag ? " -p" : "",
 241                             argv[i], argv[argc - 1]);
 242                         if (ret == -1)
 243                                 err (1, "malloc");
 244                         if (susystem(bp))
 245                                 ++errs;
 246                         free(bp);
 247                         continue;
 248                 }
 249                 *src++ = 0;
 250                 if (*src == 0)
 251                         src = ".";
 252                 if ((host = strchr(argv[i], '@')) == NULL) {
 253                         host = argv[i];
 254                         suser = pwd->pw_name;
 255                 } else {
 256                         *host++ = 0;
 257                         suser = argv[i];
 258                         if (*suser == '\0')
 259                                 suser = pwd->pw_name;
 260                         else if (!okname(suser))
 261                                 continue;
 262                 }
 263                 ret = asprintf(&bp, "%s -f %s", cmd, src);
 264                 if (ret == -1)
 265                         err (1, "malloc");
 266                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 267                         free(bp);
 268                         ++errs;
 269                         continue;
 270                 }
 271                 free(bp);
 272                 sink(1, argv + argc - 1);
 273                 close(remin);
 274                 remin = remout = -1;
 275         }
 276 }
 277
 278 void
 279 source(int argc, char **argv)
 280 {
 281         struct stat stb;
 282         static BUF buffer;
 283         BUF *bp;
 284         off_t i;
 285         off_t amt;
 286         int fd, haderr, indx, result;
 287         char *last, *name, buf[BUFSIZ];
 288
 289         for (indx = 0; indx < argc; ++indx) {
 290                 name = argv[indx];
 291                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 292                         goto syserr;
 293                 if (fstat(fd, &stb)) {
 294 syserr:                 run_err("%s: %s", name, strerror(errno));
 295                         goto next;
 296                 }
 297                 if (S_ISDIR(stb.st_mode) && iamrecursive) {
 298                         rsource(name, &stb);
 299                         goto next;
 300                 } else if (!S_ISREG(stb.st_mode)) {
 301                         run_err("%s: not a regular file", name);
 302                         goto next;
 303                 }
 304                 if ((last = strrchr(name, '/')) == NULL)
 305                         last = name;
 306                 else
 307                         ++last;
 308                 if (pflag) {
 309                         /*
 310                          * Make it compatible with possible future
 311                          * versions expecting microseconds.
 312                          */
 313                         snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
 314                             (long)stb.st_mtime,
 315                             (long)stb.st_atime);
 316                         write(remout, buf, strlen(buf));
 317                         if (response() < 0)
 318                                 goto next;
 319                 }
 320 #undef MODEMASK
 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                          (unsigned int)(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, (size_t)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, (size_t)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",
 390                  (unsigned int)(statp->st_mode & MODEMASK), 0, last);
 391         write(remout, path, strlen(path));
 392         if (response() < 0) {
 393                 closedir(dirp);
 394                 return;
 395         }
 396         while ((dp = readdir(dirp)) != NULL) {
 397                 if (dp->d_ino == 0)
 398                         continue;
 399                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 400                         continue;
 401                 if (strlen(name) + 1 + strlen(dp->d_name) >= MAXPATHLEN - 1) {
 402                         run_err("%s/%s: name too long", name, dp->d_name);
 403                         continue;
 404                 }
 405                 snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
 406                 vect[0] = path;
 407                 source(1, vect);
 408         }
 409         closedir(dirp);
 410         write(remout, "E\n", 2);
 411         response();
 412 }
 413
 414 void
 415 sink(int argc, char **argv)
 416 {
 417         static BUF buffer;
 418         struct stat stb;
 419         struct timeval tv[2];
 420         enum { YES, NO, DISPLAYED } wrerr;
 421         BUF *bp;
 422         off_t i, j, size;
 423         int amt, count, exists, first, mask, mode, ofd, omode;
 424         int setimes, targisdir, wrerrno = 0;
 425         char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ];
 426
 427 #define atime   tv[0]
 428 #define mtime   tv[1]
 429 #define SCREWUP(str)    { why = str; goto screwup; }
 430
 431         setimes = targisdir = 0;
 432         mask = umask(0);
 433         if (!pflag)
 434                 umask(mask);
 435         if (argc != 1) {
 436                 run_err("ambiguous target");
 437                 exit(1);
 438         }
 439         targ = *argv;
 440         if (targetshouldbedirectory)
 441                 verifydir(targ);
 442         write(remout, "", 1);
 443         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 444                 targisdir = 1;
 445         for (first = 1;; first = 0) {
 446                 cp = buf;
 447                 if (read(remin, cp, 1) <= 0)
 448                         return;
 449                 if (*cp++ == '\n')
 450                         SCREWUP("unexpected <newline>");
 451                 do {
 452                         if (read(remin, &ch, sizeof(ch)) != sizeof(ch))
 453                                 SCREWUP("lost connection");
 454                         *cp++ = ch;
 455                 } while (cp < &buf[BUFSIZ - 1] && ch != '\n');
 456                 *cp = 0;
 457
 458                 if (buf[0] == '\01' || buf[0] == '\02') {
 459                         if (iamremote == 0)
 460                                 write(STDERR_FILENO,
 461                                     buf + 1, strlen(buf + 1));
 462                         if (buf[0] == '\02')
 463                                 exit(1);
 464                         ++errs;
 465                         continue;
 466                 }
 467                 if (buf[0] == 'E') {
 468                         write(remout, "", 1);
 469                         return;
 470                 }
 471
 472                 if (ch == '\n')
 473                         *--cp = 0;
 474
 475                 cp = buf;
 476                 if (*cp == 'T') {
 477                         setimes++;
 478                         cp++;
 479                         mtime.tv_sec = strtol(cp, &cp, 10);
 480                         if (!cp || *cp++ != ' ')
 481                                 SCREWUP("mtime.sec not delimited");
 482                         mtime.tv_usec = strtol(cp, &cp, 10);
 483                         if (!cp || *cp++ != ' ')
 484                                 SCREWUP("mtime.usec not delimited");
 485                         atime.tv_sec = strtol(cp, &cp, 10);
 486                         if (!cp || *cp++ != ' ')
 487                                 SCREWUP("atime.sec not delimited");
 488                         atime.tv_usec = strtol(cp, &cp, 10);
 489                         if (!cp || *cp++ != '\0')
 490                                 SCREWUP("atime.usec not delimited");
 491                         write(remout, "", 1);
 492                         continue;
 493                 }
 494                 if (*cp != 'C' && *cp != 'D') {
 495                         /*
 496                          * Check for the case "rcp remote:foo\* local:bar".
 497                          * In this case, the line "No match." can be returned
 498                          * by the shell before the rcp command on the remote is
 499                          * executed so the ^Aerror_message convention isn't
 500                          * followed.
 501                          */
 502                         if (first) {
 503                                 run_err("%s", cp);
 504                                 exit(1);
 505                         }
 506                         SCREWUP("expected control record");
 507                 }
 508                 mode = 0;
 509                 for (++cp; cp < buf + 5; cp++) {
 510                         if (*cp < '0' || *cp > '7')
 511                                 SCREWUP("bad mode");
 512                         mode = (mode << 3) | (*cp - '0');
 513                 }
 514                 if (*cp++ != ' ')
 515                         SCREWUP("mode not delimited");
 516
 517                 for (size = 0; isdigit((unsigned char)*cp);)
 518                         size = size * 10 + (*cp++ - '0');
 519                 if (*cp++ != ' ')
 520                         SCREWUP("size not delimited");
 521                 if (targisdir) {
 522                         static char *namebuf;
 523                         static int cursize;
 524                         size_t need;
 525
 526                         need = strlen(targ) + strlen(cp) + 250;
 527                         if (need > cursize) {
 528                                 if (!(namebuf = malloc(need)))
 529                                         run_err("%s", strerror(errno));
 530                         }
 531                         snprintf(namebuf, need, "%s%s%s", targ,
 532                             *targ ? "/" : "", cp);
 533                         np = namebuf;
 534                 } else
 535                         np = targ;
 536                 exists = stat(np, &stb) == 0;
 537                 if (buf[0] == 'D') {
 538                         int mod_flag = pflag;
 539                         if (exists) {
 540                                 if (!S_ISDIR(stb.st_mode)) {
 541                                         errno = ENOTDIR;
 542                                         goto bad;
 543                                 }
 544                                 if (pflag)
 545                                         chmod(np, mode);
 546                         } else {
 547                                 /* Handle copying from a read-only directory */
 548                                 mod_flag = 1;
 549                                 if (mkdir(np, mode | S_IRWXU) < 0)
 550                                         goto bad;
 551                         }
 552                         vect[0] = np;
 553                         sink(1, vect);
 554                         if (setimes) {
 555                                 setimes = 0;
 556                                 if (utimes(np, tv) < 0)
 557                                     run_err("%s: set times: %s",
 558                                         np, strerror(errno));
 559                         }
 560                         if (mod_flag)
 561                                 chmod(np, mode);
 562                         continue;
 563                 }
 564                 omode = mode;
 565                 mode |= S_IWRITE;
 566                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 567 bad:                    run_err("%s: %s", np, strerror(errno));
 568                         continue;
 569                 }
 570                 write(remout, "", 1);
 571                 if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
 572                         close(ofd);
 573                         continue;
 574                 }
 575                 cp = bp->buf;
 576                 wrerr = NO;
 577                 for (count = i = 0; i < size; i += BUFSIZ) {
 578                         amt = BUFSIZ;
 579                         if (i + amt > size)
 580                                 amt = size - i;
 581                         count += amt;
 582                         if((j = net_read(remin, cp, amt)) != amt) {
 583                             run_err("%s", j ? strerror(errno) :
 584                                     "dropped connection");
 585                             exit(1);
 586                         }
 587                         amt -= j;
 588                         cp += j;
 589                         if (count == bp->cnt) {
 590                                 /* Keep reading so we stay sync'd up. */
 591                                 if (wrerr == NO) {
 592                                         j = write(ofd, bp->buf, (size_t)count);
 593                                         if (j != count) {
 594                                                 wrerr = YES;
 595                                                 wrerrno = j >= 0 ? EIO : errno;
 596                                         }
 597                                 }
 598                                 count = 0;
 599                                 cp = bp->buf;
 600                         }
 601                 }
 602                 if (count != 0 && wrerr == NO &&
 603                     (j = write(ofd, bp->buf, (size_t)count)) != count) {
 604                         wrerr = YES;
 605                         wrerrno = j >= 0 ? EIO : errno;
 606                 }
 607                 if (ftruncate(ofd, size)) {
 608                         run_err("%s: truncate: %s", np, strerror(errno));
 609                         wrerr = DISPLAYED;
 610                 }
 611                 if (pflag) {
 612                         if (exists || omode != mode)
 613                                 if (fchmod(ofd, omode))
 614                                         run_err("%s: set mode: %s",
 615                                             np, strerror(errno));
 616                 } else {
 617                         if (!exists && omode != mode)
 618                                 if (fchmod(ofd, omode & ~mask))
 619                                         run_err("%s: set mode: %s",
 620                                             np, strerror(errno));
 621                 }
 622                 close(ofd);
 623                 response();
 624                 if (setimes && wrerr == NO) {
 625                         setimes = 0;
 626                         if (utimes(np, tv) < 0) {
 627                                 run_err("%s: set times: %s",
 628                                     np, strerror(errno));
 629                                 wrerr = DISPLAYED;
 630                         }
 631                 }
 632                 switch(wrerr) {
 633                 case YES:
 634                         run_err("%s: %s", np, strerror(wrerrno));
 635                         break;
 636                 case NO:
 637                         write(remout, "", 1);
 638                         break;
 639                 case DISPLAYED:
 640                         break;
 641                 }
 642         }
 643 screwup:
 644         run_err("protocol error: %s", why);
 645         exit(1);
 646 }
 647
 648 int
 649 response(void)
 650 {
 651         char ch, *cp, resp, rbuf[BUFSIZ];
 652
 653         if (read(remin, &resp, sizeof(resp)) != sizeof(resp))
 654                 lostconn(0);
 655
 656         cp = rbuf;
 657         switch(resp) {
 658         case 0:                         /* ok */
 659                 return (0);
 660         default:
 661                 *cp++ = resp;
 662                 /* FALLTHROUGH */
 663         case 1:                         /* error, followed by error msg */
 664         case 2:                         /* fatal error, "" */
 665                 do {
 666                         if (read(remin, &ch, sizeof(ch)) != sizeof(ch))
 667                                 lostconn(0);
 668                         *cp++ = ch;
 669                 } while (cp < &rbuf[BUFSIZ] && ch != '\n');
 670
 671                 if (!iamremote)
 672                         write(STDERR_FILENO, rbuf, cp - rbuf);
 673                 ++errs;
 674                 if (resp == 1)
 675                         return (-1);
 676                 exit(1);
 677         }
 678         /* NOTREACHED */
 679 }
 680
 681 #include <stdarg.h>
 682
 683 void
 684 run_err(const char *fmt, ...)
 685 {
 686         static FILE *fp;
 687         va_list ap;
 688
 689         ++errs;
 690         if (fp == NULL && !(fp = fdopen(remout, "w")))
 691                 return;
 692         va_start(ap, fmt);
 693         fprintf(fp, "%c", 0x01);
 694         fprintf(fp, "rcp: ");
 695         vfprintf(fp, fmt, ap);
 696         fprintf(fp, "\n");
 697         fflush(fp);
 698         va_end(ap);
 699
 700         if (!iamremote) {
 701             va_start(ap, fmt);
 702             vwarnx(fmt, ap);
 703             va_end(ap);
 704         }
 705 }
 706
 707 /*
 708  * This function executes the given command as the specified user on the
 709  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 710  * assigns the input and output file descriptors on success.
 711  *
 712  * If it cannot create necessary pipes it exits with error message.
 713  */
 714
 715 int
 716 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 717 {
 718         int pin[2], pout[2], reserved[2];
 719
 720         /*
 721          * Reserve two descriptors so that the real pipes won't get
 722          * descriptors 0 and 1 because that will screw up dup2 below.
 723          */
 724         pipe(reserved);
 725
 726         /* Create a socket pair for communicating with rsh. */
 727         if (pipe(pin) < 0) {
 728                 perror("pipe");
 729                 exit(255);
 730         }
 731         if (pipe(pout) < 0) {
 732                 perror("pipe");
 733                 exit(255);
 734         }
 735
 736         /* Free the reserved descriptors. */
 737         close(reserved[0]);
 738         close(reserved[1]);
 739
 740         /* For a child to execute the command on the remote host using rsh. */
 741         if (fork() == 0) {
 742                 char *args[100];
 743                 unsigned int i;
 744
 745                 /* Child. */
 746                 close(pin[1]);
 747                 close(pout[0]);
 748                 dup2(pin[0], 0);
 749                 dup2(pout[1], 1);
 750                 close(pin[0]);
 751                 close(pout[1]);
 752
 753                 i = 0;
 754                 args[i++] = RSH_PROGRAM;
 755                 if (usekrb4)
 756                         args[i++] = "-4";
 757                 if (usekrb5)
 758                         args[i++] = "-5";
 759                 if (usebroken)
 760                         args[i++] = "-K";
 761                 if (doencrypt)
 762                         args[i++] = "-x";
 763                 if (forwardtkt)
 764                         args[i++] = "-F";
 765                 if (noencrypt)
 766                         args[i++] = "-z";
 767                 if (port != NULL) {
 768                         args[i++] = "-p";
 769                         args[i++] = port;
 770                 }
 771                 if (eflag)
 772                     args[i++] = "-e";
 773                 if (remuser != NULL) {
 774                         args[i++] = "-l";
 775                         args[i++] = remuser;
 776                 }
 777                 args[i++] = host;
 778                 args[i++] = cmd;
 779                 args[i++] = NULL;
 780
 781                 execvp(RSH_PROGRAM, args);
 782                 perror(RSH_PROGRAM);
 783                 exit(1);
 784         }
 785         /* Parent.  Close the other side, and return the local side. */
 786         close(pin[0]);
 787         *fdout = pin[1];
 788         close(pout[1]);
 789         *fdin = pout[0];
 790         return 0;
 791 }