bin/rcp/rcp.c

   1 /*
   2  * Copyright (c) 1983, 1990, 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 2002 Networks Associates Technology, Inc.
   5  * All rights reserved.
   6  *
   7  * Portions of this software were developed for the FreeBSD Project by
   8  * ThinkSec AS and NAI Labs, the Security Research Division of Network
   9  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
  10  * ("CBOSS"), as part of the DARPA CHATS research program.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #if 0
  42 #ifndef lint
  43 static char const copyright[] =
  44 "@(#) Copyright (c) 1983, 1990, 1992, 1993\n\
  45         The Regents of the University of California.  All rights reserved.\n";
  46 #endif /* not lint */
  47
  48 #ifndef lint
  49 static char sccsid[] = "@(#)rcp.c       8.2 (Berkeley) 4/2/94";
  50 #endif /* not lint */
  51 #endif
  52 #include <sys/cdefs.h>
  53 __FBSDID("$FreeBSD$");
  54
  55 #include <sys/param.h>
  56 #include <sys/stat.h>
  57 #include <sys/time.h>
  58 #include <sys/socket.h>
  59 #include <netinet/in.h>
  60 #include <netinet/in_systm.h>
  61 #include <netinet/ip.h>
  62
  63 #include <ctype.h>
  64 #include <dirent.h>
  65 #include <err.h>
  66 #include <errno.h>
  67 #include <fcntl.h>
  68 #include <libutil.h>
  69 #include <limits.h>
  70 #include <netdb.h>
  71 #include <paths.h>
  72 #include <pwd.h>
  73 #include <signal.h>
  74 #include <stdint.h>
  75 #include <stdio.h>
  76 #include <stdlib.h>
  77 #include <string.h>
  78 #include <string.h>
  79 #include <unistd.h>
  80
  81 #include "extern.h"
  82
  83 #define OPTIONS "46dfprt"
  84
  85 struct passwd *pwd;
  86 u_short port;
  87 uid_t   userid;
  88 int errs, rem;
  89 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
  90 int family = PF_UNSPEC;
  91
  92 static int argc_copy;
  93 static const char **argv_copy;
  94
  95 static char period[] = ".";
  96
  97 #define CMDNEEDS        64
  98 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
  99
 100 int      response(void);
 101 void     rsource(char *, struct stat *);
 102 void     sink(int, char *[]);
 103 void     source(int, char *[]);
 104 void     tolocal(int, char *[]);
 105 void     toremote(char *, int, char *[]);
 106 void     usage(void);
 107
 108 int
 109 main(int argc, char *argv[])
 110 {
 111         struct servent *sp;
 112         int ch, fflag, i, tflag;
 113         char *targ;
 114
 115         /*
 116          * Prepare for execing ourselves.
 117          */
 118         argc_copy = argc + 1;
 119         argv_copy = malloc((argc_copy + 1) * sizeof(*argv_copy));
 120         if (argv_copy == NULL)
 121                 err(1, "malloc");
 122         argv_copy[0] = argv[0];
 123         argv_copy[1] = "-K";
 124         for (i = 1; i < argc; ++i) {
 125                 argv_copy[i + 1] = strdup(argv[i]);
 126                 if (argv_copy[i + 1] == NULL)
 127                         errx(1, "strdup: out of memory");
 128         }
 129         argv_copy[argc + 1] = NULL;
 130
 131         fflag = tflag = 0;
 132         while ((ch = getopt(argc, argv, OPTIONS)) != -1)
 133                 switch(ch) {                    /* User-visible flags. */
 134                 case '4':
 135                         family = PF_INET;
 136                         break;
 137
 138                 case '6':
 139                         family = PF_INET6;
 140                         break;
 141
 142                 case 'p':
 143                         pflag = 1;
 144                         break;
 145                 case 'r':
 146                         iamrecursive = 1;
 147                         break;
 148                                                 /* Server options. */
 149                 case 'd':
 150                         targetshouldbedirectory = 1;
 151                         break;
 152                 case 'f':                       /* "from" */
 153                         iamremote = 1;
 154                         fflag = 1;
 155                         break;
 156                 case 't':                       /* "to" */
 157                         iamremote = 1;
 158                         tflag = 1;
 159                         break;
 160                 case '?':
 161                 default:
 162                         usage();
 163                 }
 164         argc -= optind;
 165         argv += optind;
 166
 167         sp = getservbyname("shell", "tcp");
 168         if (sp == NULL)
 169                 errx(1, "shell/tcp: unknown service");
 170         port = sp->s_port;
 171
 172         if ((pwd = getpwuid(userid = getuid())) == NULL)
 173                 errx(1, "unknown user %d", (int)userid);
 174
 175         rem = STDIN_FILENO;             /* XXX */
 176
 177         if (fflag) {                    /* Follow "protocol", send data. */
 178                 (void)response();
 179                 (void)setuid(userid);
 180                 source(argc, argv);
 181                 exit(errs);
 182         }
 183
 184         if (tflag) {                    /* Receive data. */
 185                 (void)setuid(userid);
 186                 sink(argc, argv);
 187                 exit(errs);
 188         }
 189
 190         if (argc < 2)
 191                 usage();
 192         if (argc > 2)
 193                 targetshouldbedirectory = 1;
 194
 195         rem = -1;
 196         /* Command to be executed on remote system using "rsh". */
 197         (void)snprintf(cmd, sizeof(cmd), "rcp%s%s%s",
 198             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 199             targetshouldbedirectory ? " -d" : "");
 200
 201         (void)signal(SIGPIPE, lostconn);
 202
 203         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 204                 toremote(targ, argc, argv);
 205         else {
 206                 tolocal(argc, argv);            /* Dest is local host. */
 207                 if (targetshouldbedirectory)
 208                         verifydir(argv[argc - 1]);
 209         }
 210         exit(errs);
 211 }
 212
 213 void
 214 toremote(char *targ, int argc, char *argv[])
 215 {
 216         int i, tos;
 217         char *bp, *host, *src, *suser, *thost, *tuser;
 218
 219         *targ++ = 0;
 220         if (*targ == 0)
 221                 targ = period;
 222
 223         if ((thost = strchr(argv[argc - 1], '@'))) {
 224                 /* user@host */
 225                 *thost++ = 0;
 226                 tuser = argv[argc - 1];
 227                 if (*tuser == '\0')
 228                         tuser = NULL;
 229                 else if (!okname(tuser))
 230                         exit(1);
 231         } else {
 232                 thost = argv[argc - 1];
 233                 tuser = NULL;
 234         }
 235
 236         for (i = 0; i < argc - 1; i++) {
 237                 src = colon(argv[i]);
 238                 if (src) {                      /* remote to remote */
 239                         *src++ = 0;
 240                         if (*src == 0)
 241                                 src = period;
 242                         host = strchr(argv[i], '@');
 243                         if (host) {
 244                                 *host++ = 0;
 245                                 suser = argv[i];
 246                                 if (*suser == '\0')
 247                                         suser = pwd->pw_name;
 248                                 else if (!okname(suser)) {
 249                                         ++errs;
 250                                         continue;
 251                                 }
 252                                 if (asprintf(&bp,
 253                                     "%s %s -l %s -n %s %s '%s%s%s:%s'",
 254                                     _PATH_RSH, host, suser, cmd, src,
 255                                     tuser ? tuser : "", tuser ? "@" : "",
 256                                     thost, targ) == -1)
 257                                         err(1, "asprintf");
 258                         } else
 259                                 if (asprintf(&bp,
 260                                     "exec %s %s -n %s %s '%s%s%s:%s'",
 261                                     _PATH_RSH, argv[i], cmd, src,
 262                                     tuser ? tuser : "", tuser ? "@" : "",
 263                                     thost, targ) == -1)
 264                                         err(1, "asprintf");
 265                         (void)susystem(bp, userid);
 266                         (void)free(bp);
 267                 } else {                        /* local to remote */
 268                         if (rem == -1) {
 269                                 if (asprintf(&bp, "%s -t %s", cmd, targ)
 270                                         == -1)
 271                                         err(1, "asprintf");
 272                                 host = thost;
 273                                 rem = rcmd_af(&host, port,
 274                                     pwd->pw_name,
 275                                     tuser ? tuser : pwd->pw_name,
 276                                     bp, 0, family);
 277                                 if (rem < 0)
 278                                         exit(1);
 279                                 if (family == PF_INET) {
 280                                         tos = IPTOS_THROUGHPUT;
 281                                         if (setsockopt(rem, IPPROTO_IP, IP_TOS,
 282                                             &tos, sizeof(int)) < 0)
 283                                                 warn("TOS (ignored)");
 284                                 }
 285                                 if (response() < 0)
 286                                         exit(1);
 287                                 (void)free(bp);
 288                                 (void)setuid(userid);
 289                         }
 290                         source(1, argv+i);
 291                 }
 292         }
 293 }
 294
 295 void
 296 tolocal(int argc, char *argv[])
 297 {
 298         int i, len, tos;
 299         char *bp, *host, *src, *suser;
 300
 301         for (i = 0; i < argc - 1; i++) {
 302                 if (!(src = colon(argv[i]))) {          /* Local to local. */
 303                         len = strlen(_PATH_CP) + strlen(argv[i]) +
 304                             strlen(argv[argc - 1]) + 20;
 305                         if (!(bp = malloc(len)))
 306                                 err(1, "malloc");
 307                         (void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
 308                             iamrecursive ? " -PR" : "", pflag ? " -p" : "",
 309                             argv[i], argv[argc - 1]);
 310                         if (susystem(bp, userid))
 311                                 ++errs;
 312                         (void)free(bp);
 313                         continue;
 314                 }
 315                 *src++ = 0;
 316                 if (*src == 0)
 317                         src = period;
 318                 if ((host = strchr(argv[i], '@')) == NULL) {
 319                         host = argv[i];
 320                         suser = pwd->pw_name;
 321                 } else {
 322                         *host++ = 0;
 323                         suser = argv[i];
 324                         if (*suser == '\0')
 325                                 suser = pwd->pw_name;
 326                         else if (!okname(suser)) {
 327                                 ++errs;
 328                                 continue;
 329                         }
 330                 }
 331                 len = strlen(src) + CMDNEEDS + 20;
 332                 if ((bp = malloc(len)) == NULL)
 333                         err(1, "malloc");
 334                 (void)snprintf(bp, len, "%s -f %s", cmd, src);
 335                 rem = rcmd_af(&host, port, pwd->pw_name, suser, bp, 0,
 336                             family);
 337                 (void)free(bp);
 338                 if (rem < 0) {
 339                         ++errs;
 340                         continue;
 341                 }
 342                 (void)seteuid(userid);
 343                 if (family == PF_INET) {
 344                         tos = IPTOS_THROUGHPUT;
 345                         if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos,
 346                             sizeof(int)) < 0)
 347                                 warn("TOS (ignored)");
 348                 }
 349                 sink(1, argv + argc - 1);
 350                 (void)seteuid(0);
 351                 (void)close(rem);
 352                 rem = -1;
 353         }
 354 }
 355
 356 void
 357 source(int argc, char *argv[])
 358 {
 359         struct stat stb;
 360         static BUF buffer;
 361         BUF *bp;
 362         off_t i;
 363         int amt, fd, haderr, indx, result;
 364         char *last, *name, buf[BUFSIZ];
 365
 366         for (indx = 0; indx < argc; ++indx) {
 367                 name = argv[indx];
 368                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 369                         goto syserr;
 370                 if (fstat(fd, &stb)) {
 371 syserr:                 run_err("%s: %s", name, strerror(errno));
 372                         goto next;
 373                 }
 374                 switch (stb.st_mode & S_IFMT) {
 375                 case S_IFREG:
 376                         break;
 377                 case S_IFDIR:
 378                         if (iamrecursive) {
 379                                 rsource(name, &stb);
 380                                 goto next;
 381                         }
 382                         /* FALLTHROUGH */
 383                 default:
 384                         run_err("%s: not a regular file", name);
 385                         goto next;
 386                 }
 387                 if ((last = strrchr(name, '/')) == NULL)
 388                         last = name;
 389                 else
 390                         ++last;
 391                 if (pflag) {
 392                         /*
 393                          * Make it compatible with possible future
 394                          * versions expecting microseconds.
 395                          */
 396                         (void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
 397                             (long)stb.st_mtimespec.tv_sec,
 398                             (long)stb.st_atimespec.tv_sec);
 399                         (void)write(rem, buf, strlen(buf));
 400                         if (response() < 0)
 401                                 goto next;
 402                 }
 403 #define MODEMASK        (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
 404                 (void)snprintf(buf, sizeof(buf), "C%04o %jd %s\n",
 405                     stb.st_mode & MODEMASK, (intmax_t)stb.st_size, last);
 406                 (void)write(rem, buf, strlen(buf));
 407                 if (response() < 0)
 408                         goto next;
 409                 if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
 410 next:                   (void)close(fd);
 411                         continue;
 412                 }
 413
 414                 /* Keep writing after an error so that we stay sync'd up. */
 415                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 416                         amt = bp->cnt;
 417                         if (i + amt > stb.st_size)
 418                                 amt = stb.st_size - i;
 419                         if (!haderr) {
 420                                 result = read(fd, bp->buf, amt);
 421                                 if (result != amt)
 422                                         haderr = result >= 0 ? EIO : errno;
 423                         }
 424                         if (haderr)
 425                                 (void)write(rem, bp->buf, amt);
 426                         else {
 427                                 result = write(rem, bp->buf, amt);
 428                                 if (result != amt)
 429                                         haderr = result >= 0 ? EIO : errno;
 430                         }
 431                 }
 432                 if (close(fd) && !haderr)
 433                         haderr = errno;
 434                 if (!haderr)
 435                         (void)write(rem, "", 1);
 436                 else
 437                         run_err("%s: %s", name, strerror(haderr));
 438                 (void)response();
 439         }
 440 }
 441
 442 void
 443 rsource(char *name, struct stat *statp)
 444 {
 445         DIR *dirp;
 446         struct dirent *dp;
 447         char *last, *vect[1], path[PATH_MAX];
 448
 449         if (!(dirp = opendir(name))) {
 450                 run_err("%s: %s", name, strerror(errno));
 451                 return;
 452         }
 453         last = strrchr(name, '/');
 454         if (last == 0)
 455                 last = name;
 456         else
 457                 last++;
 458         if (pflag) {
 459                 (void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
 460                     (long)statp->st_mtimespec.tv_sec,
 461                     (long)statp->st_atimespec.tv_sec);
 462                 (void)write(rem, path, strlen(path));
 463                 if (response() < 0) {
 464                         closedir(dirp);
 465                         return;
 466                 }
 467         }
 468         (void)snprintf(path, sizeof(path),
 469             "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
 470         (void)write(rem, path, strlen(path));
 471         if (response() < 0) {
 472                 closedir(dirp);
 473                 return;
 474         }
 475         while ((dp = readdir(dirp))) {
 476                 if (dp->d_ino == 0)
 477                         continue;
 478                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 479                         continue;
 480                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path)) {
 481                         run_err("%s/%s: name too long", name, dp->d_name);
 482                         continue;
 483                 }
 484                 (void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
 485                 vect[0] = path;
 486                 source(1, vect);
 487         }
 488         (void)closedir(dirp);
 489         (void)write(rem, "E\n", 2);
 490         (void)response();
 491 }
 492
 493 void
 494 sink(int argc, char *argv[])
 495 {
 496         static BUF buffer;
 497         struct stat stb;
 498         struct timeval tv[2];
 499         enum { YES, NO, DISPLAYED } wrerr;
 500         BUF *bp;
 501         off_t i, j, size;
 502         int amt, exists, first, mask, mode, ofd, omode;
 503         size_t count;
 504         int setimes, targisdir, wrerrno = 0;
 505         char ch, *cp, *np, *targ, *vect[1], buf[BUFSIZ], path[PATH_MAX];
 506         const char *why;
 507
 508 #define atime   tv[0]
 509 #define mtime   tv[1]
 510 #define SCREWUP(str)    { why = str; goto screwup; }
 511
 512         setimes = targisdir = 0;
 513         mask = umask(0);
 514         if (!pflag)
 515                 (void)umask(mask);
 516         if (argc != 1) {
 517                 run_err("ambiguous target");
 518                 exit(1);
 519         }
 520         targ = *argv;
 521         if (targetshouldbedirectory)
 522                 verifydir(targ);
 523         (void)write(rem, "", 1);
 524         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 525                 targisdir = 1;
 526         for (first = 1;; first = 0) {
 527                 cp = buf;
 528                 if (read(rem, cp, 1) <= 0)
 529                         return;
 530                 if (*cp++ == '\n')
 531                         SCREWUP("unexpected <newline>");
 532                 do {
 533                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
 534                                 SCREWUP("lost connection");
 535                         *cp++ = ch;
 536                 } while (cp < &buf[BUFSIZ - 1] && ch != '\n');
 537                 *cp = 0;
 538
 539                 if (buf[0] == '\01' || buf[0] == '\02') {
 540                         if (iamremote == 0)
 541                                 (void)write(STDERR_FILENO,
 542                                     buf + 1, strlen(buf + 1));
 543                         if (buf[0] == '\02')
 544                                 exit(1);
 545                         ++errs;
 546                         continue;
 547                 }
 548                 if (buf[0] == 'E') {
 549                         (void)write(rem, "", 1);
 550                         return;
 551                 }
 552
 553                 if (ch == '\n')
 554                         *--cp = 0;
 555
 556                 cp = buf;
 557                 if (*cp == 'T') {
 558                         setimes++;
 559                         cp++;
 560                         mtime.tv_sec = strtol(cp, &cp, 10);
 561                         if (!cp || *cp++ != ' ')
 562                                 SCREWUP("mtime.sec not delimited");
 563                         mtime.tv_usec = strtol(cp, &cp, 10);
 564                         if (!cp || *cp++ != ' ')
 565                                 SCREWUP("mtime.usec not delimited");
 566                         atime.tv_sec = strtol(cp, &cp, 10);
 567                         if (!cp || *cp++ != ' ')
 568                                 SCREWUP("atime.sec not delimited");
 569                         atime.tv_usec = strtol(cp, &cp, 10);
 570                         if (!cp || *cp++ != '\0')
 571                                 SCREWUP("atime.usec not delimited");
 572                         (void)write(rem, "", 1);
 573                         continue;
 574                 }
 575                 if (*cp != 'C' && *cp != 'D') {
 576                         /*
 577                          * Check for the case "rcp remote:foo\* local:bar".
 578                          * In this case, the line "No match." can be returned
 579                          * by the shell before the rcp command on the remote is
 580                          * executed so the ^Aerror_message convention isn't
 581                          * followed.
 582                          */
 583                         if (first) {
 584                                 run_err("%s", cp);
 585                                 exit(1);
 586                         }
 587                         SCREWUP("expected control record");
 588                 }
 589                 mode = 0;
 590                 for (++cp; cp < buf + 5; cp++) {
 591                         if (*cp < '0' || *cp > '7')
 592                                 SCREWUP("bad mode");
 593                         mode = (mode << 3) | (*cp - '0');
 594                 }
 595                 if (*cp++ != ' ')
 596                         SCREWUP("mode not delimited");
 597
 598                 for (size = 0; isdigit(*cp);)
 599                         size = size * 10 + (*cp++ - '0');
 600                 if (*cp++ != ' ')
 601                         SCREWUP("size not delimited");
 602                 if (targisdir) {
 603                         if (strlen(targ) + (*targ ? 1 : 0) + strlen(cp)
 604                                         >= sizeof(path)) {
 605                                 run_err("%s%s%s: name too long", targ,
 606                                         *targ ? "/" : "", cp);
 607                                 exit(1);
 608                         }
 609                         (void)snprintf(path, sizeof(path), "%s%s%s", targ,
 610                             *targ ? "/" : "", cp);
 611                         np = path;
 612                 } else
 613                         np = targ;
 614                 exists = stat(np, &stb) == 0;
 615                 if (buf[0] == 'D') {
 616                         int mod_flag = pflag;
 617                         if (exists) {
 618                                 if (!S_ISDIR(stb.st_mode)) {
 619                                         errno = ENOTDIR;
 620                                         goto bad;
 621                                 }
 622                                 if (pflag)
 623                                         (void)chmod(np, mode);
 624                         } else {
 625                                 /* Handle copying from a read-only directory */
 626                                 mod_flag = 1;
 627                                 if (mkdir(np, mode | S_IRWXU) < 0)
 628                                         goto bad;
 629                         }
 630                         vect[0] = np;
 631                         sink(1, vect);
 632                         if (setimes) {
 633                                 setimes = 0;
 634                                 if (utimes(np, tv) < 0)
 635                                     run_err("%s: set times: %s",
 636                                         np, strerror(errno));
 637                         }
 638                         if (mod_flag)
 639                                 (void)chmod(np, mode);
 640                         continue;
 641                 }
 642                 omode = mode;
 643                 mode |= S_IWRITE;
 644                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 645 bad:                    run_err("%s: %s", np, strerror(errno));
 646                         continue;
 647                 }
 648                 (void)write(rem, "", 1);
 649                 if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
 650                         (void)close(ofd);
 651                         continue;
 652                 }
 653                 cp = bp->buf;
 654                 wrerr = NO;
 655                 for (count = i = 0; i < size; i += BUFSIZ) {
 656                         amt = BUFSIZ;
 657                         if (i + amt > size)
 658                                 amt = size - i;
 659                         count += amt;
 660                         do {
 661                                 j = read(rem, cp, amt);
 662                                 if (j <= 0) {
 663                                         run_err("%s", j ? strerror(errno) :
 664                                             "dropped connection");
 665                                         exit(1);
 666                                 }
 667                                 amt -= j;
 668                                 cp += j;
 669                         } while (amt > 0);
 670                         if (count == bp->cnt) {
 671                                 /* Keep reading so we stay sync'd up. */
 672                                 if (wrerr == NO) {
 673                                         j = write(ofd, bp->buf, count);
 674                                         if (j != (off_t)count) {
 675                                                 wrerr = YES;
 676                                                 wrerrno = j >= 0 ? EIO : errno;
 677                                         }
 678                                 }
 679                                 count = 0;
 680                                 cp = bp->buf;
 681                         }
 682                 }
 683                 if (count != 0 && wrerr == NO &&
 684                     (j = write(ofd, bp->buf, count)) != (off_t)count) {
 685                         wrerr = YES;
 686                         wrerrno = j >= 0 ? EIO : errno;
 687                 }
 688                 if (ftruncate(ofd, size)) {
 689                         run_err("%s: truncate: %s", np, strerror(errno));
 690                         wrerr = DISPLAYED;
 691                 }
 692                 if (pflag) {
 693                         if (exists || omode != mode)
 694                                 if (fchmod(ofd, omode))
 695                                         run_err("%s: set mode: %s",
 696                                             np, strerror(errno));
 697                 } else {
 698                         if (!exists && omode != mode)
 699                                 if (fchmod(ofd, omode & ~mask))
 700                                         run_err("%s: set mode: %s",
 701                                             np, strerror(errno));
 702                 }
 703                 (void)close(ofd);
 704                 (void)response();
 705                 if (setimes && wrerr == NO) {
 706                         setimes = 0;
 707                         if (utimes(np, tv) < 0) {
 708                                 run_err("%s: set times: %s",
 709                                     np, strerror(errno));
 710                                 wrerr = DISPLAYED;
 711                         }
 712                 }
 713                 switch(wrerr) {
 714                 case YES:
 715                         run_err("%s: %s", np, strerror(wrerrno));
 716                         break;
 717                 case NO:
 718                         (void)write(rem, "", 1);
 719                         break;
 720                 case DISPLAYED:
 721                         break;
 722                 }
 723         }
 724 screwup:
 725         run_err("protocol error: %s", why);
 726         exit(1);
 727 }
 728
 729 int
 730 response(void)
 731 {
 732         char ch, *cp, resp, rbuf[BUFSIZ];
 733
 734         if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
 735                 lostconn(0);
 736
 737         cp = rbuf;
 738         switch(resp) {
 739         case 0:                         /* ok */
 740                 return (0);
 741         default:
 742                 *cp++ = resp;
 743                 /* FALLTHROUGH */
 744         case 1:                         /* error, followed by error msg */
 745         case 2:                         /* fatal error, "" */
 746                 do {
 747                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
 748                                 lostconn(0);
 749                         *cp++ = ch;
 750                 } while (cp < &rbuf[BUFSIZ] && ch != '\n');
 751
 752                 if (!iamremote)
 753                         (void)write(STDERR_FILENO, rbuf, cp - rbuf);
 754                 ++errs;
 755                 if (resp == 1)
 756                         return (-1);
 757                 exit(1);
 758         }
 759         /* NOTREACHED */
 760 }
 761
 762 void
 763 usage(void)
 764 {
 765         (void)fprintf(stderr, "%s\n%s\n",
 766             "usage: rcp [-46p] f1 f2",
 767             "       rcp [-46pr] f1 ... fn directory");
 768         exit(1);
 769 }
 770
 771 #include <stdarg.h>
 772
 773 void
 774 run_err(const char *fmt, ...)
 775 {
 776         static FILE *fp;
 777         va_list ap;
 778
 779         ++errs;
 780         if (fp == NULL && !(fp = fdopen(rem, "w")))
 781                 return;
 782         (void)fprintf(fp, "%c", 0x01);
 783         (void)fprintf(fp, "rcp: ");
 784         va_start(ap, fmt);
 785         (void)vfprintf(fp, fmt, ap);
 786         va_end(ap);
 787         (void)fprintf(fp, "\n");
 788         (void)fflush(fp);
 789
 790         if (!iamremote) {
 791                 va_start(ap, fmt);
 792                 vwarnx(fmt, ap);
 793                 va_end(ap);
 794         }
 795
 796         va_end(ap);
 797 }