bin/rcp/rcp.c

   1 /*-
   2  * Copyright (c) 1983, 1990, 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 2002 Networks Associates Technology, Inc.
   5  * All rights reserved.
   6  *
   7  * Portions of this software were developed for the FreeBSD Project by
   8  * ThinkSec AS and NAI Labs, the Security Research Division of Network
   9  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
  10  * ("CBOSS"), as part of the DARPA CHATS research program.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #if 0
  38 #ifndef lint
  39 static char const copyright[] =
  40 "@(#) Copyright (c) 1983, 1990, 1992, 1993\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif /* not lint */
  43
  44 #ifndef lint
  45 static char sccsid[] = "@(#)rcp.c       8.2 (Berkeley) 4/2/94";
  46 #endif /* not lint */
  47 #endif
  48 #include <sys/cdefs.h>
  49 __FBSDID("$FreeBSD$");
  50
  51 #include <sys/param.h>
  52 #include <sys/stat.h>
  53 #include <sys/time.h>
  54 #include <sys/socket.h>
  55 #include <netinet/in.h>
  56 #include <netinet/in_systm.h>
  57 #include <netinet/ip.h>
  58
  59 #include <ctype.h>
  60 #include <dirent.h>
  61 #include <err.h>
  62 #include <errno.h>
  63 #include <fcntl.h>
  64 #include <limits.h>
  65 #include <netdb.h>
  66 #include <paths.h>
  67 #include <pwd.h>
  68 #include <signal.h>
  69 #include <stdint.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <unistd.h>
  74
  75 #include "extern.h"
  76
  77 #define OPTIONS "46dfprt"
  78
  79 static struct passwd *pwd;
  80 static u_short  port;
  81 static uid_t    userid;
  82 static int errs, rem;
  83 int iamremote;
  84 static int pflag, iamrecursive, targetshouldbedirectory;
  85 static int family = PF_UNSPEC;
  86
  87 static int argc_copy;
  88 static const char **argv_copy;
  89
  90 static char period[] = ".";
  91
  92 #define CMDNEEDS        64
  93 static char cmd[CMDNEEDS];      /* must hold "rcp -r -p -d\0" */
  94
  95 int      response(void);
  96 void     rsource(char *, struct stat *);
  97 void     sink(int, char *[]);
  98 void     source(int, char *[]);
  99 void     tolocal(int, char *[]);
 100 void     toremote(char *, int, char *[]);
 101 void     usage(void);
 102
 103 int
 104 main(int argc, char *argv[])
 105 {
 106         struct servent *sp;
 107         int ch, fflag, i, tflag;
 108         char *targ;
 109
 110         /*
 111          * Prepare for execing ourselves.
 112          */
 113         argc_copy = argc + 1;
 114         argv_copy = malloc((argc_copy + 1) * sizeof(*argv_copy));
 115         if (argv_copy == NULL)
 116                 err(1, "malloc");
 117         argv_copy[0] = argv[0];
 118         argv_copy[1] = "-K";
 119         for (i = 1; i < argc; ++i) {
 120                 argv_copy[i + 1] = strdup(argv[i]);
 121                 if (argv_copy[i + 1] == NULL)
 122                         errx(1, "strdup: out of memory");
 123         }
 124         argv_copy[argc + 1] = NULL;
 125
 126         fflag = tflag = 0;
 127         while ((ch = getopt(argc, argv, OPTIONS)) != -1)
 128                 switch(ch) {                    /* User-visible flags. */
 129                 case '4':
 130                         family = PF_INET;
 131                         break;
 132
 133                 case '6':
 134                         family = PF_INET6;
 135                         break;
 136
 137                 case 'p':
 138                         pflag = 1;
 139                         break;
 140                 case 'r':
 141                         iamrecursive = 1;
 142                         break;
 143                                                 /* Server options. */
 144                 case 'd':
 145                         targetshouldbedirectory = 1;
 146                         break;
 147                 case 'f':                       /* "from" */
 148                         iamremote = 1;
 149                         fflag = 1;
 150                         break;
 151                 case 't':                       /* "to" */
 152                         iamremote = 1;
 153                         tflag = 1;
 154                         break;
 155                 case '?':
 156                 default:
 157                         usage();
 158                 }
 159         argc -= optind;
 160         argv += optind;
 161
 162         sp = getservbyname("shell", "tcp");
 163         if (sp == NULL)
 164                 errx(1, "shell/tcp: unknown service");
 165         port = sp->s_port;
 166
 167         if ((pwd = getpwuid(userid = getuid())) == NULL)
 168                 errx(1, "unknown user %d", (int)userid);
 169
 170         rem = STDIN_FILENO;             /* XXX */
 171
 172         if (fflag) {                    /* Follow "protocol", send data. */
 173                 (void)response();
 174                 (void)setuid(userid);
 175                 source(argc, argv);
 176                 exit(errs);
 177         }
 178
 179         if (tflag) {                    /* Receive data. */
 180                 (void)setuid(userid);
 181                 sink(argc, argv);
 182                 exit(errs);
 183         }
 184
 185         if (argc < 2)
 186                 usage();
 187         if (argc > 2)
 188                 targetshouldbedirectory = 1;
 189
 190         rem = -1;
 191         /* Command to be executed on remote system using "rsh". */
 192         (void)snprintf(cmd, sizeof(cmd), "rcp%s%s%s",
 193             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 194             targetshouldbedirectory ? " -d" : "");
 195
 196         (void)signal(SIGPIPE, lostconn);
 197
 198         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 199                 toremote(targ, argc, argv);
 200         else {
 201                 tolocal(argc, argv);            /* Dest is local host. */
 202                 if (targetshouldbedirectory)
 203                         verifydir(argv[argc - 1]);
 204         }
 205         exit(errs);
 206 }
 207
 208 void
 209 toremote(char *targ, int argc, char *argv[])
 210 {
 211         int i, tos;
 212         char *bp, *host, *src, *suser, *thost, *tuser;
 213
 214         *targ++ = 0;
 215         if (*targ == 0)
 216                 targ = period;
 217
 218         if ((thost = strchr(argv[argc - 1], '@'))) {
 219                 /* user@host */
 220                 *thost++ = 0;
 221                 tuser = argv[argc - 1];
 222                 if (*tuser == '\0')
 223                         tuser = NULL;
 224                 else if (!okname(tuser))
 225                         exit(1);
 226         } else {
 227                 thost = argv[argc - 1];
 228                 tuser = NULL;
 229         }
 230
 231         for (i = 0; i < argc - 1; i++) {
 232                 src = colon(argv[i]);
 233                 if (src) {                      /* remote to remote */
 234                         *src++ = 0;
 235                         if (*src == 0)
 236                                 src = period;
 237                         host = strchr(argv[i], '@');
 238                         if (host) {
 239                                 *host++ = 0;
 240                                 suser = argv[i];
 241                                 if (*suser == '\0')
 242                                         suser = pwd->pw_name;
 243                                 else if (!okname(suser)) {
 244                                         ++errs;
 245                                         continue;
 246                                 }
 247                                 if (asprintf(&bp,
 248                                     "%s %s -l %s -n %s %s '%s%s%s:%s'",
 249                                     _PATH_RSH, host, suser, cmd, src,
 250                                     tuser ? tuser : "", tuser ? "@" : "",
 251                                     thost, targ) == -1)
 252                                         err(1, "asprintf");
 253                         } else
 254                                 if (asprintf(&bp,
 255                                     "exec %s %s -n %s %s '%s%s%s:%s'",
 256                                     _PATH_RSH, argv[i], cmd, src,
 257                                     tuser ? tuser : "", tuser ? "@" : "",
 258                                     thost, targ) == -1)
 259                                         err(1, "asprintf");
 260                         (void)susystem(bp, userid);
 261                         (void)free(bp);
 262                 } else {                        /* local to remote */
 263                         if (rem == -1) {
 264                                 if (asprintf(&bp, "%s -t %s", cmd, targ)
 265                                         == -1)
 266                                         err(1, "asprintf");
 267                                 host = thost;
 268                                 rem = rcmd_af(&host, port,
 269                                     pwd->pw_name,
 270                                     tuser ? tuser : pwd->pw_name,
 271                                     bp, 0, family);
 272                                 if (rem < 0)
 273                                         exit(1);
 274                                 if (family == PF_INET) {
 275                                         tos = IPTOS_THROUGHPUT;
 276                                         if (setsockopt(rem, IPPROTO_IP, IP_TOS,
 277                                             &tos, sizeof(int)) < 0)
 278                                                 warn("TOS (ignored)");
 279                                 }
 280                                 if (response() < 0)
 281                                         exit(1);
 282                                 (void)free(bp);
 283                                 (void)setuid(userid);
 284                         }
 285                         source(1, argv+i);
 286                 }
 287         }
 288 }
 289
 290 void
 291 tolocal(int argc, char *argv[])
 292 {
 293         int i, len, tos;
 294         char *bp, *host, *src, *suser;
 295
 296         for (i = 0; i < argc - 1; i++) {
 297                 if (!(src = colon(argv[i]))) {          /* Local to local. */
 298                         len = strlen(_PATH_CP) + strlen(argv[i]) +
 299                             strlen(argv[argc - 1]) + 20;
 300                         if (!(bp = malloc(len)))
 301                                 err(1, "malloc");
 302                         (void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
 303                             iamrecursive ? " -PR" : "", pflag ? " -p" : "",
 304                             argv[i], argv[argc - 1]);
 305                         if (susystem(bp, userid))
 306                                 ++errs;
 307                         (void)free(bp);
 308                         continue;
 309                 }
 310                 *src++ = 0;
 311                 if (*src == 0)
 312                         src = period;
 313                 if ((host = strchr(argv[i], '@')) == NULL) {
 314                         host = argv[i];
 315                         suser = pwd->pw_name;
 316                 } else {
 317                         *host++ = 0;
 318                         suser = argv[i];
 319                         if (*suser == '\0')
 320                                 suser = pwd->pw_name;
 321                         else if (!okname(suser)) {
 322                                 ++errs;
 323                                 continue;
 324                         }
 325                 }
 326                 len = strlen(src) + CMDNEEDS + 20;
 327                 if ((bp = malloc(len)) == NULL)
 328                         err(1, "malloc");
 329                 (void)snprintf(bp, len, "%s -f %s", cmd, src);
 330                 rem = rcmd_af(&host, port, pwd->pw_name, suser, bp, 0,
 331                             family);
 332                 (void)free(bp);
 333                 if (rem < 0) {
 334                         ++errs;
 335                         continue;
 336                 }
 337                 (void)seteuid(userid);
 338                 if (family == PF_INET) {
 339                         tos = IPTOS_THROUGHPUT;
 340                         if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos,
 341                             sizeof(int)) < 0)
 342                                 warn("TOS (ignored)");
 343                 }
 344                 sink(1, argv + argc - 1);
 345                 (void)seteuid(0);
 346                 (void)close(rem);
 347                 rem = -1;
 348         }
 349 }
 350
 351 void
 352 source(int argc, char *argv[])
 353 {
 354         struct stat stb;
 355         static BUF buffer;
 356         BUF *bp;
 357         off_t i;
 358         int amt, fd, haderr, indx, result;
 359         char *last, *name, buf[BUFSIZ];
 360
 361         for (indx = 0; indx < argc; ++indx) {
 362                 name = argv[indx];
 363                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 364                         goto syserr;
 365                 if (fstat(fd, &stb)) {
 366 syserr:                 run_err("%s: %s", name, strerror(errno));
 367                         goto next;
 368                 }
 369                 switch (stb.st_mode & S_IFMT) {
 370                 case S_IFREG:
 371                         break;
 372                 case S_IFDIR:
 373                         if (iamrecursive) {
 374                                 rsource(name, &stb);
 375                                 goto next;
 376                         }
 377                         /* FALLTHROUGH */
 378                 default:
 379                         run_err("%s: not a regular file", name);
 380                         goto next;
 381                 }
 382                 if ((last = strrchr(name, '/')) == NULL)
 383                         last = name;
 384                 else
 385                         ++last;
 386                 if (pflag) {
 387                         /*
 388                          * Make it compatible with possible future
 389                          * versions expecting microseconds.
 390                          */
 391                         (void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
 392                             (long)stb.st_mtim.tv_sec,
 393                             (long)stb.st_atim.tv_sec);
 394                         (void)write(rem, buf, strlen(buf));
 395                         if (response() < 0)
 396                                 goto next;
 397                 }
 398 #define MODEMASK        (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
 399                 (void)snprintf(buf, sizeof(buf), "C%04o %jd %s\n",
 400                     stb.st_mode & MODEMASK, (intmax_t)stb.st_size, last);
 401                 (void)write(rem, buf, strlen(buf));
 402                 if (response() < 0)
 403                         goto next;
 404                 if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
 405 next:                   if (fd >= 0)
 406                                 (void)close(fd);
 407                         continue;
 408                 }
 409
 410                 /* Keep writing after an error so that we stay sync'd up. */
 411                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 412                         amt = bp->cnt;
 413                         if (i + amt > stb.st_size)
 414                                 amt = stb.st_size - i;
 415                         if (!haderr) {
 416                                 result = read(fd, bp->buf, amt);
 417                                 if (result != amt)
 418                                         haderr = result >= 0 ? EIO : errno;
 419                         }
 420                         if (haderr)
 421                                 (void)write(rem, bp->buf, amt);
 422                         else {
 423                                 result = write(rem, bp->buf, amt);
 424                                 if (result != amt)
 425                                         haderr = result >= 0 ? EIO : errno;
 426                         }
 427                 }
 428                 if (close(fd) && !haderr)
 429                         haderr = errno;
 430                 if (!haderr)
 431                         (void)write(rem, "", 1);
 432                 else
 433                         run_err("%s: %s", name, strerror(haderr));
 434                 (void)response();
 435         }
 436 }
 437
 438 void
 439 rsource(char *name, struct stat *statp)
 440 {
 441         DIR *dirp;
 442         struct dirent *dp;
 443         char *last, *vect[1], path[PATH_MAX];
 444
 445         if (!(dirp = opendir(name))) {
 446                 run_err("%s: %s", name, strerror(errno));
 447                 return;
 448         }
 449         last = strrchr(name, '/');
 450         if (last == 0)
 451                 last = name;
 452         else
 453                 last++;
 454         if (pflag) {
 455                 (void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
 456                     (long)statp->st_mtim.tv_sec,
 457                     (long)statp->st_atim.tv_sec);
 458                 (void)write(rem, path, strlen(path));
 459                 if (response() < 0) {
 460                         closedir(dirp);
 461                         return;
 462                 }
 463         }
 464         (void)snprintf(path, sizeof(path),
 465             "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
 466         (void)write(rem, path, strlen(path));
 467         if (response() < 0) {
 468                 closedir(dirp);
 469                 return;
 470         }
 471         while ((dp = readdir(dirp))) {
 472                 if (dp->d_ino == 0)
 473                         continue;
 474                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 475                         continue;
 476                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path)) {
 477                         run_err("%s/%s: name too long", name, dp->d_name);
 478                         continue;
 479                 }
 480                 (void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
 481                 vect[0] = path;
 482                 source(1, vect);
 483         }
 484         (void)closedir(dirp);
 485         (void)write(rem, "E\n", 2);
 486         (void)response();
 487 }
 488
 489 void
 490 sink(int argc, char *argv[])
 491 {
 492         static BUF buffer;
 493         struct stat stb;
 494         struct timeval tv[2];
 495         enum { YES, NO, DISPLAYED } wrerr;
 496         BUF *bp;
 497         off_t i, j, size;
 498         int amt, exists, first, mask, mode, ofd, omode;
 499         size_t count;
 500         int setimes, targisdir, wrerrno = 0;
 501         char ch, *cp, *np, *targ, *vect[1], buf[BUFSIZ], path[PATH_MAX];
 502         const char *why;
 503
 504 #define atime   tv[0]
 505 #define mtime   tv[1]
 506 #define SCREWUP(str)    { why = str; goto screwup; }
 507
 508         setimes = targisdir = 0;
 509         mask = umask(0);
 510         if (!pflag)
 511                 (void)umask(mask);
 512         if (argc != 1) {
 513                 run_err("ambiguous target");
 514                 exit(1);
 515         }
 516         targ = *argv;
 517         if (targetshouldbedirectory)
 518                 verifydir(targ);
 519         (void)write(rem, "", 1);
 520         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 521                 targisdir = 1;
 522         for (first = 1;; first = 0) {
 523                 cp = buf;
 524                 if (read(rem, cp, 1) <= 0)
 525                         return;
 526                 if (*cp++ == '\n')
 527                         SCREWUP("unexpected <newline>");
 528                 do {
 529                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
 530                                 SCREWUP("lost connection");
 531                         *cp++ = ch;
 532                 } while (cp < &buf[BUFSIZ - 1] && ch != '\n');
 533                 *cp = 0;
 534
 535                 if (buf[0] == '\01' || buf[0] == '\02') {
 536                         if (iamremote == 0)
 537                                 (void)write(STDERR_FILENO,
 538                                     buf + 1, strlen(buf + 1));
 539                         if (buf[0] == '\02')
 540                                 exit(1);
 541                         ++errs;
 542                         continue;
 543                 }
 544                 if (buf[0] == 'E') {
 545                         (void)write(rem, "", 1);
 546                         return;
 547                 }
 548
 549                 if (ch == '\n')
 550                         *--cp = 0;
 551
 552                 cp = buf;
 553                 if (*cp == 'T') {
 554                         setimes++;
 555                         cp++;
 556                         mtime.tv_sec = strtol(cp, &cp, 10);
 557                         if (!cp || *cp++ != ' ')
 558                                 SCREWUP("mtime.sec not delimited");
 559                         mtime.tv_usec = strtol(cp, &cp, 10);
 560                         if (!cp || *cp++ != ' ')
 561                                 SCREWUP("mtime.usec not delimited");
 562                         atime.tv_sec = strtol(cp, &cp, 10);
 563                         if (!cp || *cp++ != ' ')
 564                                 SCREWUP("atime.sec not delimited");
 565                         atime.tv_usec = strtol(cp, &cp, 10);
 566                         if (!cp || *cp++ != '\0')
 567                                 SCREWUP("atime.usec not delimited");
 568                         (void)write(rem, "", 1);
 569                         continue;
 570                 }
 571                 if (*cp != 'C' && *cp != 'D') {
 572                         /*
 573                          * Check for the case "rcp remote:foo\* local:bar".
 574                          * In this case, the line "No match." can be returned
 575                          * by the shell before the rcp command on the remote is
 576                          * executed so the ^Aerror_message convention isn't
 577                          * followed.
 578                          */
 579                         if (first) {
 580                                 run_err("%s", cp);
 581                                 exit(1);
 582                         }
 583                         SCREWUP("expected control record");
 584                 }
 585                 mode = 0;
 586                 for (++cp; cp < buf + 5; cp++) {
 587                         if (*cp < '0' || *cp > '7')
 588                                 SCREWUP("bad mode");
 589                         mode = (mode << 3) | (*cp - '0');
 590                 }
 591                 if (*cp++ != ' ')
 592                         SCREWUP("mode not delimited");
 593
 594                 for (size = 0; isdigit(*cp);)
 595                         size = size * 10 + (*cp++ - '0');
 596                 if (*cp++ != ' ')
 597                         SCREWUP("size not delimited");
 598                 if (targisdir) {
 599                         if (strlen(targ) + (*targ ? 1 : 0) + strlen(cp)
 600                                         >= sizeof(path)) {
 601                                 run_err("%s%s%s: name too long", targ,
 602                                         *targ ? "/" : "", cp);
 603                                 exit(1);
 604                         }
 605                         (void)snprintf(path, sizeof(path), "%s%s%s", targ,
 606                             *targ ? "/" : "", cp);
 607                         np = path;
 608                 } else
 609                         np = targ;
 610                 exists = stat(np, &stb) == 0;
 611                 if (buf[0] == 'D') {
 612                         int mod_flag = pflag;
 613                         if (exists) {
 614                                 if (!S_ISDIR(stb.st_mode)) {
 615                                         errno = ENOTDIR;
 616                                         goto bad;
 617                                 }
 618                                 if (pflag)
 619                                         (void)chmod(np, mode);
 620                         } else {
 621                                 /* Handle copying from a read-only directory */
 622                                 mod_flag = 1;
 623                                 if (mkdir(np, mode | S_IRWXU) < 0)
 624                                         goto bad;
 625                         }
 626                         vect[0] = np;
 627                         sink(1, vect);
 628                         if (setimes) {
 629                                 setimes = 0;
 630                                 if (utimes(np, tv) < 0)
 631                                     run_err("%s: set times: %s",
 632                                         np, strerror(errno));
 633                         }
 634                         if (mod_flag)
 635                                 (void)chmod(np, mode);
 636                         continue;
 637                 }
 638                 omode = mode;
 639                 mode |= S_IWRITE;
 640                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 641 bad:                    run_err("%s: %s", np, strerror(errno));
 642                         continue;
 643                 }
 644                 (void)write(rem, "", 1);
 645                 if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
 646                         (void)close(ofd);
 647                         continue;
 648                 }
 649                 cp = bp->buf;
 650                 wrerr = NO;
 651                 for (count = i = 0; i < size; i += BUFSIZ) {
 652                         amt = BUFSIZ;
 653                         if (i + amt > size)
 654                                 amt = size - i;
 655                         count += amt;
 656                         do {
 657                                 j = read(rem, cp, amt);
 658                                 if (j <= 0) {
 659                                         run_err("%s", j ? strerror(errno) :
 660                                             "dropped connection");
 661                                         exit(1);
 662                                 }
 663                                 amt -= j;
 664                                 cp += j;
 665                         } while (amt > 0);
 666                         if (count == bp->cnt) {
 667                                 /* Keep reading so we stay sync'd up. */
 668                                 if (wrerr == NO) {
 669                                         j = write(ofd, bp->buf, count);
 670                                         if (j != (off_t)count) {
 671                                                 wrerr = YES;
 672                                                 wrerrno = j >= 0 ? EIO : errno;
 673                                         }
 674                                 }
 675                                 count = 0;
 676                                 cp = bp->buf;
 677                         }
 678                 }
 679                 if (count != 0 && wrerr == NO &&
 680                     (j = write(ofd, bp->buf, count)) != (off_t)count) {
 681                         wrerr = YES;
 682                         wrerrno = j >= 0 ? EIO : errno;
 683                 }
 684                 if (ftruncate(ofd, size)) {
 685                         run_err("%s: truncate: %s", np, strerror(errno));
 686                         wrerr = DISPLAYED;
 687                 }
 688                 if (pflag) {
 689                         if (exists || omode != mode)
 690                                 if (fchmod(ofd, omode))
 691                                         run_err("%s: set mode: %s",
 692                                             np, strerror(errno));
 693                 } else {
 694                         if (!exists && omode != mode)
 695                                 if (fchmod(ofd, omode & ~mask))
 696                                         run_err("%s: set mode: %s",
 697                                             np, strerror(errno));
 698                 }
 699                 (void)close(ofd);
 700                 (void)response();
 701                 if (setimes && wrerr == NO) {
 702                         setimes = 0;
 703                         if (utimes(np, tv) < 0) {
 704                                 run_err("%s: set times: %s",
 705                                     np, strerror(errno));
 706                                 wrerr = DISPLAYED;
 707                         }
 708                 }
 709                 switch(wrerr) {
 710                 case YES:
 711                         run_err("%s: %s", np, strerror(wrerrno));
 712                         break;
 713                 case NO:
 714                         (void)write(rem, "", 1);
 715                         break;
 716                 case DISPLAYED:
 717                         break;
 718                 }
 719         }
 720 screwup:
 721         run_err("protocol error: %s", why);
 722         exit(1);
 723 }
 724
 725 int
 726 response(void)
 727 {
 728         char ch, *cp, resp, rbuf[BUFSIZ];
 729
 730         if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
 731                 lostconn(0);
 732
 733         cp = rbuf;
 734         switch(resp) {
 735         case 0:                         /* ok */
 736                 return (0);
 737         default:
 738                 *cp++ = resp;
 739                 /* FALLTHROUGH */
 740         case 1:                         /* error, followed by error msg */
 741         case 2:                         /* fatal error, "" */
 742                 do {
 743                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
 744                                 lostconn(0);
 745                         *cp++ = ch;
 746                 } while (cp < &rbuf[BUFSIZ] && ch != '\n');
 747
 748                 if (!iamremote)
 749                         (void)write(STDERR_FILENO, rbuf, cp - rbuf);
 750                 ++errs;
 751                 if (resp == 1)
 752                         return (-1);
 753                 exit(1);
 754         }
 755         /* NOTREACHED */
 756 }
 757
 758 void
 759 usage(void)
 760 {
 761         (void)fprintf(stderr, "%s\n%s\n",
 762             "usage: rcp [-46p] file1 file2",
 763             "       rcp [-46pr] file ... directory");
 764         exit(1);
 765 }
 766
 767 #include <stdarg.h>
 768
 769 void
 770 run_err(const char *fmt, ...)
 771 {
 772         static FILE *fp;
 773         va_list ap;
 774
 775         ++errs;
 776         if (fp == NULL && !(fp = fdopen(rem, "w")))
 777                 return;
 778         (void)fprintf(fp, "%c", 0x01);
 779         (void)fprintf(fp, "rcp: ");
 780         va_start(ap, fmt);
 781         (void)vfprintf(fp, fmt, ap);
 782         va_end(ap);
 783         (void)fprintf(fp, "\n");
 784         (void)fflush(fp);
 785
 786         if (!iamremote) {
 787                 va_start(ap, fmt);
 788                 vwarnx(fmt, ap);
 789                 va_end(ap);
 790         }
 791 }