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, len, 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                         len = strlen(_PATH_RSH) + strlen(argv[i]) +
 244                             strlen(src) + (tuser ? strlen(tuser) : 0) +
 245                             strlen(thost) + strlen(targ) + CMDNEEDS + 20;
 246                         if (!(bp = malloc(len)))
 247                                 err(1, "malloc");
 248                         if (host) {
 249                                 *host++ = 0;
 250                                 suser = argv[i];
 251                                 if (*suser == '\0')
 252                                         suser = pwd->pw_name;
 253                                 else if (!okname(suser)) {
 254                                         ++errs;
 255                                         continue;
 256                                 }
 257                                 (void)snprintf(bp, len,
 258                                     "%s %s -l %s -n %s %s '%s%s%s:%s'",
 259                                     _PATH_RSH, host, suser, cmd, src,
 260                                     tuser ? tuser : "", tuser ? "@" : "",
 261                                     thost, targ);
 262                         } else
 263                                 (void)snprintf(bp, len,
 264                                     "exec %s %s -n %s %s '%s%s%s:%s'",
 265                                     _PATH_RSH, argv[i], cmd, src,
 266                                     tuser ? tuser : "", tuser ? "@" : "",
 267                                     thost, targ);
 268                         (void)susystem(bp, userid);
 269                         (void)free(bp);
 270                 } else {                        /* local to remote */
 271                         if (rem == -1) {
 272                                 len = strlen(targ) + CMDNEEDS + 20;
 273                                 if (!(bp = malloc(len)))
 274                                         err(1, "malloc");
 275                                 (void)snprintf(bp, len, "%s -t %s", cmd, targ);
 276                                 host = thost;
 277                                 rem = rcmd_af(&host, port,
 278                                     pwd->pw_name,
 279                                     tuser ? tuser : pwd->pw_name,
 280                                     bp, 0, family);
 281                                 if (rem < 0)
 282                                         exit(1);
 283                                 if (family == PF_INET) {
 284                                         tos = IPTOS_THROUGHPUT;
 285                                         if (setsockopt(rem, IPPROTO_IP, IP_TOS,
 286                                             &tos, sizeof(int)) < 0)
 287                                                 warn("TOS (ignored)");
 288                                 }
 289                                 if (response() < 0)
 290                                         exit(1);
 291                                 (void)free(bp);
 292                                 (void)setuid(userid);
 293                         }
 294                         source(1, argv+i);
 295                 }
 296         }
 297 }
 298
 299 void
 300 tolocal(int argc, char *argv[])
 301 {
 302         int i, len, tos;
 303         char *bp, *host, *src, *suser;
 304
 305         for (i = 0; i < argc - 1; i++) {
 306                 if (!(src = colon(argv[i]))) {          /* Local to local. */
 307                         len = strlen(_PATH_CP) + strlen(argv[i]) +
 308                             strlen(argv[argc - 1]) + 20;
 309                         if (!(bp = malloc(len)))
 310                                 err(1, "malloc");
 311                         (void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
 312                             iamrecursive ? " -PR" : "", pflag ? " -p" : "",
 313                             argv[i], argv[argc - 1]);
 314                         if (susystem(bp, userid))
 315                                 ++errs;
 316                         (void)free(bp);
 317                         continue;
 318                 }
 319                 *src++ = 0;
 320                 if (*src == 0)
 321                         src = period;
 322                 if ((host = strchr(argv[i], '@')) == NULL) {
 323                         host = argv[i];
 324                         suser = pwd->pw_name;
 325                 } else {
 326                         *host++ = 0;
 327                         suser = argv[i];
 328                         if (*suser == '\0')
 329                                 suser = pwd->pw_name;
 330                         else if (!okname(suser)) {
 331                                 ++errs;
 332                                 continue;
 333                         }
 334                 }
 335                 len = strlen(src) + CMDNEEDS + 20;
 336                 if ((bp = malloc(len)) == NULL)
 337                         err(1, "malloc");
 338                 (void)snprintf(bp, len, "%s -f %s", cmd, src);
 339                 rem = rcmd_af(&host, port, pwd->pw_name, suser, bp, 0,
 340                             family);
 341                 (void)free(bp);
 342                 if (rem < 0) {
 343                         ++errs;
 344                         continue;
 345                 }
 346                 (void)seteuid(userid);
 347                 if (family == PF_INET) {
 348                         tos = IPTOS_THROUGHPUT;
 349                         if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos,
 350                             sizeof(int)) < 0)
 351                                 warn("TOS (ignored)");
 352                 }
 353                 sink(1, argv + argc - 1);
 354                 (void)seteuid(0);
 355                 (void)close(rem);
 356                 rem = -1;
 357         }
 358 }
 359
 360 void
 361 source(int argc, char *argv[])
 362 {
 363         struct stat stb;
 364         static BUF buffer;
 365         BUF *bp;
 366         off_t i;
 367         int amt, fd, haderr, indx, result;
 368         char *last, *name, buf[BUFSIZ];
 369
 370         for (indx = 0; indx < argc; ++indx) {
 371                 name = argv[indx];
 372                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 373                         goto syserr;
 374                 if (fstat(fd, &stb)) {
 375 syserr:                 run_err("%s: %s", name, strerror(errno));
 376                         goto next;
 377                 }
 378                 switch (stb.st_mode & S_IFMT) {
 379                 case S_IFREG:
 380                         break;
 381                 case S_IFDIR:
 382                         if (iamrecursive) {
 383                                 rsource(name, &stb);
 384                                 goto next;
 385                         }
 386                         /* FALLTHROUGH */
 387                 default:
 388                         run_err("%s: not a regular file", name);
 389                         goto next;
 390                 }
 391                 if ((last = strrchr(name, '/')) == NULL)
 392                         last = name;
 393                 else
 394                         ++last;
 395                 if (pflag) {
 396                         /*
 397                          * Make it compatible with possible future
 398                          * versions expecting microseconds.
 399                          */
 400                         (void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
 401                             (long)stb.st_mtimespec.tv_sec,
 402                             (long)stb.st_atimespec.tv_sec);
 403                         (void)write(rem, buf, strlen(buf));
 404                         if (response() < 0)
 405                                 goto next;
 406                 }
 407 #define MODEMASK        (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
 408                 (void)snprintf(buf, sizeof(buf), "C%04o %jd %s\n",
 409                     stb.st_mode & MODEMASK, (intmax_t)stb.st_size, last);
 410                 (void)write(rem, buf, strlen(buf));
 411                 if (response() < 0)
 412                         goto next;
 413                 if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
 414 next:                   (void)close(fd);
 415                         continue;
 416                 }
 417
 418                 /* Keep writing after an error so that we stay sync'd up. */
 419                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 420                         amt = bp->cnt;
 421                         if (i + amt > stb.st_size)
 422                                 amt = stb.st_size - i;
 423                         if (!haderr) {
 424                                 result = read(fd, bp->buf, amt);
 425                                 if (result != amt)
 426                                         haderr = result >= 0 ? EIO : errno;
 427                         }
 428                         if (haderr)
 429                                 (void)write(rem, bp->buf, amt);
 430                         else {
 431                                 result = write(rem, bp->buf, amt);
 432                                 if (result != amt)
 433                                         haderr = result >= 0 ? EIO : errno;
 434                         }
 435                 }
 436                 if (close(fd) && !haderr)
 437                         haderr = errno;
 438                 if (!haderr)
 439                         (void)write(rem, "", 1);
 440                 else
 441                         run_err("%s: %s", name, strerror(haderr));
 442                 (void)response();
 443         }
 444 }
 445
 446 void
 447 rsource(char *name, struct stat *statp)
 448 {
 449         DIR *dirp;
 450         struct dirent *dp;
 451         char *last, *vect[1], path[PATH_MAX];
 452
 453         if (!(dirp = opendir(name))) {
 454                 run_err("%s: %s", name, strerror(errno));
 455                 return;
 456         }
 457         last = strrchr(name, '/');
 458         if (last == 0)
 459                 last = name;
 460         else
 461                 last++;
 462         if (pflag) {
 463                 (void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
 464                     (long)statp->st_mtimespec.tv_sec,
 465                     (long)statp->st_atimespec.tv_sec);
 466                 (void)write(rem, path, strlen(path));
 467                 if (response() < 0) {
 468                         closedir(dirp);
 469                         return;
 470                 }
 471         }
 472         (void)snprintf(path, sizeof(path),
 473             "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
 474         (void)write(rem, path, strlen(path));
 475         if (response() < 0) {
 476                 closedir(dirp);
 477                 return;
 478         }
 479         while ((dp = readdir(dirp))) {
 480                 if (dp->d_ino == 0)
 481                         continue;
 482                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 483                         continue;
 484                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path)) {
 485                         run_err("%s/%s: name too long", name, dp->d_name);
 486                         continue;
 487                 }
 488                 (void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
 489                 vect[0] = path;
 490                 source(1, vect);
 491         }
 492         (void)closedir(dirp);
 493         (void)write(rem, "E\n", 2);
 494         (void)response();
 495 }
 496
 497 void
 498 sink(int argc, char *argv[])
 499 {
 500         static BUF buffer;
 501         struct stat stb;
 502         struct timeval tv[2];
 503         enum { YES, NO, DISPLAYED } wrerr;
 504         BUF *bp;
 505         off_t i, j, size;
 506         int amt, exists, first, mask, mode, ofd, omode;
 507         size_t count;
 508         int setimes, targisdir, wrerrno = 0;
 509         char ch, *cp, *np, *targ, *vect[1], buf[BUFSIZ], path[PATH_MAX];
 510         const char *why;
 511
 512 #define atime   tv[0]
 513 #define mtime   tv[1]
 514 #define SCREWUP(str)    { why = str; goto screwup; }
 515
 516         setimes = targisdir = 0;
 517         mask = umask(0);
 518         if (!pflag)
 519                 (void)umask(mask);
 520         if (argc != 1) {
 521                 run_err("ambiguous target");
 522                 exit(1);
 523         }
 524         targ = *argv;
 525         if (targetshouldbedirectory)
 526                 verifydir(targ);
 527         (void)write(rem, "", 1);
 528         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 529                 targisdir = 1;
 530         for (first = 1;; first = 0) {
 531                 cp = buf;
 532                 if (read(rem, cp, 1) <= 0)
 533                         return;
 534                 if (*cp++ == '\n')
 535                         SCREWUP("unexpected <newline>");
 536                 do {
 537                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
 538                                 SCREWUP("lost connection");
 539                         *cp++ = ch;
 540                 } while (cp < &buf[BUFSIZ - 1] && ch != '\n');
 541                 *cp = 0;
 542
 543                 if (buf[0] == '\01' || buf[0] == '\02') {
 544                         if (iamremote == 0)
 545                                 (void)write(STDERR_FILENO,
 546                                     buf + 1, strlen(buf + 1));
 547                         if (buf[0] == '\02')
 548                                 exit(1);
 549                         ++errs;
 550                         continue;
 551                 }
 552                 if (buf[0] == 'E') {
 553                         (void)write(rem, "", 1);
 554                         return;
 555                 }
 556
 557                 if (ch == '\n')
 558                         *--cp = 0;
 559
 560                 cp = buf;
 561                 if (*cp == 'T') {
 562                         setimes++;
 563                         cp++;
 564                         mtime.tv_sec = strtol(cp, &cp, 10);
 565                         if (!cp || *cp++ != ' ')
 566                                 SCREWUP("mtime.sec not delimited");
 567                         mtime.tv_usec = strtol(cp, &cp, 10);
 568                         if (!cp || *cp++ != ' ')
 569                                 SCREWUP("mtime.usec not delimited");
 570                         atime.tv_sec = strtol(cp, &cp, 10);
 571                         if (!cp || *cp++ != ' ')
 572                                 SCREWUP("atime.sec not delimited");
 573                         atime.tv_usec = strtol(cp, &cp, 10);
 574                         if (!cp || *cp++ != '\0')
 575                                 SCREWUP("atime.usec not delimited");
 576                         (void)write(rem, "", 1);
 577                         continue;
 578                 }
 579                 if (*cp != 'C' && *cp != 'D') {
 580                         /*
 581                          * Check for the case "rcp remote:foo\* local:bar".
 582                          * In this case, the line "No match." can be returned
 583                          * by the shell before the rcp command on the remote is
 584                          * executed so the ^Aerror_message convention isn't
 585                          * followed.
 586                          */
 587                         if (first) {
 588                                 run_err("%s", cp);
 589                                 exit(1);
 590                         }
 591                         SCREWUP("expected control record");
 592                 }
 593                 mode = 0;
 594                 for (++cp; cp < buf + 5; cp++) {
 595                         if (*cp < '0' || *cp > '7')
 596                                 SCREWUP("bad mode");
 597                         mode = (mode << 3) | (*cp - '0');
 598                 }
 599                 if (*cp++ != ' ')
 600                         SCREWUP("mode not delimited");
 601
 602                 for (size = 0; isdigit(*cp);)
 603                         size = size * 10 + (*cp++ - '0');
 604                 if (*cp++ != ' ')
 605                         SCREWUP("size not delimited");
 606                 if (targisdir) {
 607                         if (strlen(targ) + (*targ ? 1 : 0) + strlen(cp)
 608                                         >= sizeof(path)) {
 609                                 run_err("%s%s%s: name too long", targ,
 610                                         *targ ? "/" : "", cp);
 611                                 exit(1);
 612                         }
 613                         (void)snprintf(path, sizeof(path), "%s%s%s", targ,
 614                             *targ ? "/" : "", cp);
 615                         np = path;
 616                 } else
 617                         np = targ;
 618                 exists = stat(np, &stb) == 0;
 619                 if (buf[0] == 'D') {
 620                         int mod_flag = pflag;
 621                         if (exists) {
 622                                 if (!S_ISDIR(stb.st_mode)) {
 623                                         errno = ENOTDIR;
 624                                         goto bad;
 625                                 }
 626                                 if (pflag)
 627                                         (void)chmod(np, mode);
 628                         } else {
 629                                 /* Handle copying from a read-only directory */
 630                                 mod_flag = 1;
 631                                 if (mkdir(np, mode | S_IRWXU) < 0)
 632                                         goto bad;
 633                         }
 634                         vect[0] = np;
 635                         sink(1, vect);
 636                         if (setimes) {
 637                                 setimes = 0;
 638                                 if (utimes(np, tv) < 0)
 639                                     run_err("%s: set times: %s",
 640                                         np, strerror(errno));
 641                         }
 642                         if (mod_flag)
 643                                 (void)chmod(np, mode);
 644                         continue;
 645                 }
 646                 omode = mode;
 647                 mode |= S_IWRITE;
 648                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 649 bad:                    run_err("%s: %s", np, strerror(errno));
 650                         continue;
 651                 }
 652                 (void)write(rem, "", 1);
 653                 if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
 654                         (void)close(ofd);
 655                         continue;
 656                 }
 657                 cp = bp->buf;
 658                 wrerr = NO;
 659                 for (count = i = 0; i < size; i += BUFSIZ) {
 660                         amt = BUFSIZ;
 661                         if (i + amt > size)
 662                                 amt = size - i;
 663                         count += amt;
 664                         do {
 665                                 j = read(rem, cp, amt);
 666                                 if (j <= 0) {
 667                                         run_err("%s", j ? strerror(errno) :
 668                                             "dropped connection");
 669                                         exit(1);
 670                                 }
 671                                 amt -= j;
 672                                 cp += j;
 673                         } while (amt > 0);
 674                         if (count == bp->cnt) {
 675                                 /* Keep reading so we stay sync'd up. */
 676                                 if (wrerr == NO) {
 677                                         j = write(ofd, bp->buf, count);
 678                                         if (j != (off_t)count) {
 679                                                 wrerr = YES;
 680                                                 wrerrno = j >= 0 ? EIO : errno;
 681                                         }
 682                                 }
 683                                 count = 0;
 684                                 cp = bp->buf;
 685                         }
 686                 }
 687                 if (count != 0 && wrerr == NO &&
 688                     (j = write(ofd, bp->buf, count)) != (off_t)count) {
 689                         wrerr = YES;
 690                         wrerrno = j >= 0 ? EIO : errno;
 691                 }
 692                 if (ftruncate(ofd, size)) {
 693                         run_err("%s: truncate: %s", np, strerror(errno));
 694                         wrerr = DISPLAYED;
 695                 }
 696                 if (pflag) {
 697                         if (exists || omode != mode)
 698                                 if (fchmod(ofd, omode))
 699                                         run_err("%s: set mode: %s",
 700                                             np, strerror(errno));
 701                 } else {
 702                         if (!exists && omode != mode)
 703                                 if (fchmod(ofd, omode & ~mask))
 704                                         run_err("%s: set mode: %s",
 705                                             np, strerror(errno));
 706                 }
 707                 (void)close(ofd);
 708                 (void)response();
 709                 if (setimes && wrerr == NO) {
 710                         setimes = 0;
 711                         if (utimes(np, tv) < 0) {
 712                                 run_err("%s: set times: %s",
 713                                     np, strerror(errno));
 714                                 wrerr = DISPLAYED;
 715                         }
 716                 }
 717                 switch(wrerr) {
 718                 case YES:
 719                         run_err("%s: %s", np, strerror(wrerrno));
 720                         break;
 721                 case NO:
 722                         (void)write(rem, "", 1);
 723                         break;
 724                 case DISPLAYED:
 725                         break;
 726                 }
 727         }
 728 screwup:
 729         run_err("protocol error: %s", why);
 730         exit(1);
 731 }
 732
 733 int
 734 response(void)
 735 {
 736         char ch, *cp, resp, rbuf[BUFSIZ];
 737
 738         if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
 739                 lostconn(0);
 740
 741         cp = rbuf;
 742         switch(resp) {
 743         case 0:                         /* ok */
 744                 return (0);
 745         default:
 746                 *cp++ = resp;
 747                 /* FALLTHROUGH */
 748         case 1:                         /* error, followed by error msg */
 749         case 2:                         /* fatal error, "" */
 750                 do {
 751                         if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
 752                                 lostconn(0);
 753                         *cp++ = ch;
 754                 } while (cp < &rbuf[BUFSIZ] && ch != '\n');
 755
 756                 if (!iamremote)
 757                         (void)write(STDERR_FILENO, rbuf, cp - rbuf);
 758                 ++errs;
 759                 if (resp == 1)
 760                         return (-1);
 761                 exit(1);
 762         }
 763         /* NOTREACHED */
 764 }
 765
 766 void
 767 usage(void)
 768 {
 769         (void)fprintf(stderr, "%s\n%s\n",
 770             "usage: rcp [-46p] f1 f2",
 771             "       rcp [-46pr] f1 ... fn directory");
 772         exit(1);
 773 }
 774
 775 #include <stdarg.h>
 776
 777 void
 778 run_err(const char *fmt, ...)
 779 {
 780         static FILE *fp;
 781         va_list ap;
 782
 783         ++errs;
 784         if (fp == NULL && !(fp = fdopen(rem, "w")))
 785                 return;
 786         (void)fprintf(fp, "%c", 0x01);
 787         (void)fprintf(fp, "rcp: ");
 788         va_start(ap, fmt);
 789         (void)vfprintf(fp, fmt, ap);
 790         va_end(ap);
 791         (void)fprintf(fp, "\n");
 792         (void)fflush(fp);
 793
 794         if (!iamremote) {
 795                 va_start(ap, fmt);
 796                 vwarnx(fmt, ap);
 797                 va_end(ap);
 798         }
 799
 800         va_end(ap);
 801 }