crypto/openssh/scp.c

   1 /* $OpenBSD: scp.c,v 1.180 2014/06/24 02:21:01 djm Exp $ */
   2 /*
   3  * scp - secure remote copy.  This is basically patched BSD rcp which
   4  * uses ssh to do the data transfer (instead of using rcmd).
   5  *
   6  * NOTE: This version should NOT be suid root.  (This uses ssh to
   7  * do the transfer and ssh has the necessary privileges.)
   8  *
   9  * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
  10  *
  11  * As far as I am concerned, the code I have written for this software
  12  * can be used freely for any purpose.  Any derived versions of this
  13  * software must be clearly marked as such, and if the derived work is
  14  * incompatible with the protocol description in the RFC file, it must be
  15  * called by a name other than "ssh" or "Secure Shell".
  16  */
  17 /*
  18  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  19  * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  * 1. Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in the
  28  *    documentation and/or other materials provided with the distribution.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  33  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  39  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 /*
  43  * Parts from:
  44  *
  45  * Copyright (c) 1983, 1990, 1992, 1993, 1995
  46  *      The Regents of the University of California.  All rights reserved.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice, this list of conditions and the following disclaimer.
  53  * 2. Redistributions in binary form must reproduce the above copyright
  54  *    notice, this list of conditions and the following disclaimer in the
  55  *    documentation and/or other materials provided with the distribution.
  56  * 3. Neither the name of the University nor the names of its contributors
  57  *    may be used to endorse or promote products derived from this software
  58  *    without specific prior written permission.
  59  *
  60  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  61  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  63  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  64  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  65  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  66  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  67  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  68  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  69  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  70  * SUCH DAMAGE.
  71  *
  72  */
  73
  74 #include "includes.h"
  75
  76 #include <sys/types.h>
  77 #include <sys/param.h>
  78 #ifdef HAVE_SYS_STAT_H
  79 # include <sys/stat.h>
  80 #endif
  81 #ifdef HAVE_POLL_H
  82 #include <poll.h>
  83 #else
  84 # ifdef HAVE_SYS_POLL_H
  85 #  include <sys/poll.h>
  86 # endif
  87 #endif
  88 #ifdef HAVE_SYS_TIME_H
  89 # include <sys/time.h>
  90 #endif
  91 #include <sys/wait.h>
  92 #include <sys/uio.h>
  93
  94 #include <ctype.h>
  95 #include <dirent.h>
  96 #include <errno.h>
  97 #include <fcntl.h>
  98 #include <pwd.h>
  99 #include <signal.h>
 100 #include <stdarg.h>
 101 #include <stdio.h>
 102 #include <stdlib.h>
 103 #include <string.h>
 104 #include <time.h>
 105 #include <unistd.h>
 106 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
 107 #include <vis.h>
 108 #endif
 109
 110 #include "xmalloc.h"
 111 #include "atomicio.h"
 112 #include "pathnames.h"
 113 #include "log.h"
 114 #include "misc.h"
 115 #include "progressmeter.h"
 116
 117 extern char *__progname;
 118
 119 #define COPY_BUFLEN     16384
 120
 121 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 122 int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
 123
 124 /* Struct for addargs */
 125 arglist args;
 126 arglist remote_remote_args;
 127
 128 /* Bandwidth limit */
 129 long long limit_kbps = 0;
 130 struct bwlimit bwlimit;
 131
 132 /* Name of current file being transferred. */
 133 char *curfile;
 134
 135 /* This is set to non-zero to enable verbose mode. */
 136 int verbose_mode = 0;
 137
 138 /* This is set to zero if the progressmeter is not desired. */
 139 int showprogress = 1;
 140
 141 /*
 142  * This is set to non-zero if remote-remote copy should be piped
 143  * through this process.
 144  */
 145 int throughlocal = 0;
 146
 147 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 148 char *ssh_program = _PATH_SSH_PROGRAM;
 149
 150 /* This is used to store the pid of ssh_program */
 151 pid_t do_cmd_pid = -1;
 152
 153 static void
 154 killchild(int signo)
 155 {
 156         if (do_cmd_pid > 1) {
 157                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 158                 waitpid(do_cmd_pid, NULL, 0);
 159         }
 160
 161         if (signo)
 162                 _exit(1);
 163         exit(1);
 164 }
 165
 166 static void
 167 suspchild(int signo)
 168 {
 169         int status;
 170
 171         if (do_cmd_pid > 1) {
 172                 kill(do_cmd_pid, signo);
 173                 while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
 174                     errno == EINTR)
 175                         ;
 176                 kill(getpid(), SIGSTOP);
 177         }
 178 }
 179
 180 static int
 181 do_local_cmd(arglist *a)
 182 {
 183         u_int i;
 184         int status;
 185         pid_t pid;
 186
 187         if (a->num == 0)
 188                 fatal("do_local_cmd: no arguments");
 189
 190         if (verbose_mode) {
 191                 fprintf(stderr, "Executing:");
 192                 for (i = 0; i < a->num; i++)
 193                         fprintf(stderr, " %s", a->list[i]);
 194                 fprintf(stderr, "\n");
 195         }
 196         if ((pid = fork()) == -1)
 197                 fatal("do_local_cmd: fork: %s", strerror(errno));
 198
 199         if (pid == 0) {
 200                 execvp(a->list[0], a->list);
 201                 perror(a->list[0]);
 202                 exit(1);
 203         }
 204
 205         do_cmd_pid = pid;
 206         signal(SIGTERM, killchild);
 207         signal(SIGINT, killchild);
 208         signal(SIGHUP, killchild);
 209
 210         while (waitpid(pid, &status, 0) == -1)
 211                 if (errno != EINTR)
 212                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 213
 214         do_cmd_pid = -1;
 215
 216         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 217                 return (-1);
 218
 219         return (0);
 220 }
 221
 222 /*
 223  * This function executes the given command as the specified user on the
 224  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 225  * assigns the input and output file descriptors on success.
 226  */
 227
 228 int
 229 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 230 {
 231         int pin[2], pout[2], reserved[2];
 232
 233         if (verbose_mode)
 234                 fprintf(stderr,
 235                     "Executing: program %s host %s, user %s, command %s\n",
 236                     ssh_program, host,
 237                     remuser ? remuser : "(unspecified)", cmd);
 238
 239         /*
 240          * Reserve two descriptors so that the real pipes won't get
 241          * descriptors 0 and 1 because that will screw up dup2 below.
 242          */
 243         if (pipe(reserved) < 0)
 244                 fatal("pipe: %s", strerror(errno));
 245
 246         /* Create a socket pair for communicating with ssh. */
 247         if (pipe(pin) < 0)
 248                 fatal("pipe: %s", strerror(errno));
 249         if (pipe(pout) < 0)
 250                 fatal("pipe: %s", strerror(errno));
 251
 252         /* Free the reserved descriptors. */
 253         close(reserved[0]);
 254         close(reserved[1]);
 255
 256         signal(SIGTSTP, suspchild);
 257         signal(SIGTTIN, suspchild);
 258         signal(SIGTTOU, suspchild);
 259
 260         /* Fork a child to execute the command on the remote host using ssh. */
 261         do_cmd_pid = fork();
 262         if (do_cmd_pid == 0) {
 263                 /* Child. */
 264                 close(pin[1]);
 265                 close(pout[0]);
 266                 dup2(pin[0], 0);
 267                 dup2(pout[1], 1);
 268                 close(pin[0]);
 269                 close(pout[1]);
 270
 271                 replacearg(&args, 0, "%s", ssh_program);
 272                 if (remuser != NULL) {
 273                         addargs(&args, "-l");
 274                         addargs(&args, "%s", remuser);
 275                 }
 276                 addargs(&args, "--");
 277                 addargs(&args, "%s", host);
 278                 addargs(&args, "%s", cmd);
 279
 280                 execvp(ssh_program, args.list);
 281                 perror(ssh_program);
 282                 exit(1);
 283         } else if (do_cmd_pid == -1) {
 284                 fatal("fork: %s", strerror(errno));
 285         }
 286         /* Parent.  Close the other side, and return the local side. */
 287         close(pin[0]);
 288         *fdout = pin[1];
 289         close(pout[1]);
 290         *fdin = pout[0];
 291         signal(SIGTERM, killchild);
 292         signal(SIGINT, killchild);
 293         signal(SIGHUP, killchild);
 294         return 0;
 295 }
 296
 297 /*
 298  * This functions executes a command simlar to do_cmd(), but expects the
 299  * input and output descriptors to be setup by a previous call to do_cmd().
 300  * This way the input and output of two commands can be connected.
 301  */
 302 int
 303 do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
 304 {
 305         pid_t pid;
 306         int status;
 307
 308         if (verbose_mode)
 309                 fprintf(stderr,
 310                     "Executing: 2nd program %s host %s, user %s, command %s\n",
 311                     ssh_program, host,
 312                     remuser ? remuser : "(unspecified)", cmd);
 313
 314         /* Fork a child to execute the command on the remote host using ssh. */
 315         pid = fork();
 316         if (pid == 0) {
 317                 dup2(fdin, 0);
 318                 dup2(fdout, 1);
 319
 320                 replacearg(&args, 0, "%s", ssh_program);
 321                 if (remuser != NULL) {
 322                         addargs(&args, "-l");
 323                         addargs(&args, "%s", remuser);
 324                 }
 325                 addargs(&args, "--");
 326                 addargs(&args, "%s", host);
 327                 addargs(&args, "%s", cmd);
 328
 329                 execvp(ssh_program, args.list);
 330                 perror(ssh_program);
 331                 exit(1);
 332         } else if (pid == -1) {
 333                 fatal("fork: %s", strerror(errno));
 334         }
 335         while (waitpid(pid, &status, 0) == -1)
 336                 if (errno != EINTR)
 337                         fatal("do_cmd2: waitpid: %s", strerror(errno));
 338         return 0;
 339 }
 340
 341 typedef struct {
 342         size_t cnt;
 343         char *buf;
 344 } BUF;
 345
 346 BUF *allocbuf(BUF *, int, int);
 347 void lostconn(int);
 348 int okname(char *);
 349 void run_err(const char *,...);
 350 void verifydir(char *);
 351
 352 struct passwd *pwd;
 353 uid_t userid;
 354 int errs, remin, remout;
 355 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 356
 357 #define CMDNEEDS        64
 358 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 359
 360 int response(void);
 361 void rsource(char *, struct stat *);
 362 void sink(int, char *[]);
 363 void source(int, char *[]);
 364 void tolocal(int, char *[]);
 365 void toremote(char *, int, char *[]);
 366 void usage(void);
 367
 368 int
 369 main(int argc, char **argv)
 370 {
 371         int ch, fflag, tflag, status, n;
 372         char *targ, **newargv;
 373         const char *errstr;
 374         extern char *optarg;
 375         extern int optind;
 376
 377         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 378         sanitise_stdfd();
 379
 380         /* Copy argv, because we modify it */
 381         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 382         for (n = 0; n < argc; n++)
 383                 newargv[n] = xstrdup(argv[n]);
 384         argv = newargv;
 385
 386         __progname = ssh_get_progname(argv[0]);
 387
 388         memset(&args, '\0', sizeof(args));
 389         memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
 390         args.list = remote_remote_args.list = NULL;
 391         addargs(&args, "%s", ssh_program);
 392         addargs(&args, "-x");
 393         addargs(&args, "-oForwardAgent=no");
 394         addargs(&args, "-oPermitLocalCommand=no");
 395         addargs(&args, "-oClearAllForwardings=yes");
 396
 397         fflag = tflag = 0;
 398         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
 399                 switch (ch) {
 400                 /* User-visible flags. */
 401                 case '1':
 402                 case '2':
 403                 case '4':
 404                 case '6':
 405                 case 'C':
 406                         addargs(&args, "-%c", ch);
 407                         addargs(&remote_remote_args, "-%c", ch);
 408                         break;
 409                 case '3':
 410                         throughlocal = 1;
 411                         break;
 412                 case 'o':
 413                 case 'c':
 414                 case 'i':
 415                 case 'F':
 416                         addargs(&remote_remote_args, "-%c", ch);
 417                         addargs(&remote_remote_args, "%s", optarg);
 418                         addargs(&args, "-%c", ch);
 419                         addargs(&args, "%s", optarg);
 420                         break;
 421                 case 'P':
 422                         addargs(&remote_remote_args, "-p");
 423                         addargs(&remote_remote_args, "%s", optarg);
 424                         addargs(&args, "-p");
 425                         addargs(&args, "%s", optarg);
 426                         break;
 427                 case 'B':
 428                         addargs(&remote_remote_args, "-oBatchmode=yes");
 429                         addargs(&args, "-oBatchmode=yes");
 430                         break;
 431                 case 'l':
 432                         limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
 433                             &errstr);
 434                         if (errstr != NULL)
 435                                 usage();
 436                         limit_kbps *= 1024; /* kbps */
 437                         bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
 438                         break;
 439                 case 'p':
 440                         pflag = 1;
 441                         break;
 442                 case 'r':
 443                         iamrecursive = 1;
 444                         break;
 445                 case 'S':
 446                         ssh_program = xstrdup(optarg);
 447                         break;
 448                 case 'v':
 449                         addargs(&args, "-v");
 450                         addargs(&remote_remote_args, "-v");
 451                         verbose_mode = 1;
 452                         break;
 453                 case 'q':
 454                         addargs(&args, "-q");
 455                         addargs(&remote_remote_args, "-q");
 456                         showprogress = 0;
 457                         break;
 458
 459                 /* Server options. */
 460                 case 'd':
 461                         targetshouldbedirectory = 1;
 462                         break;
 463                 case 'f':       /* "from" */
 464                         iamremote = 1;
 465                         fflag = 1;
 466                         break;
 467                 case 't':       /* "to" */
 468                         iamremote = 1;
 469                         tflag = 1;
 470 #ifdef HAVE_CYGWIN
 471                         setmode(0, O_BINARY);
 472 #endif
 473                         break;
 474                 default:
 475                         usage();
 476                 }
 477         argc -= optind;
 478         argv += optind;
 479
 480         if ((pwd = getpwuid(userid = getuid())) == NULL)
 481                 fatal("unknown user %u", (u_int) userid);
 482
 483         if (!isatty(STDOUT_FILENO))
 484                 showprogress = 0;
 485
 486         remin = STDIN_FILENO;
 487         remout = STDOUT_FILENO;
 488
 489         if (fflag) {
 490                 /* Follow "protocol", send data. */
 491                 (void) response();
 492                 source(argc, argv);
 493                 exit(errs != 0);
 494         }
 495         if (tflag) {
 496                 /* Receive data. */
 497                 sink(argc, argv);
 498                 exit(errs != 0);
 499         }
 500         if (argc < 2)
 501                 usage();
 502         if (argc > 2)
 503                 targetshouldbedirectory = 1;
 504
 505         remin = remout = -1;
 506         do_cmd_pid = -1;
 507         /* Command to be executed on remote system using "ssh". */
 508         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 509             verbose_mode ? " -v" : "",
 510             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 511             targetshouldbedirectory ? " -d" : "");
 512
 513         (void) signal(SIGPIPE, lostconn);
 514
 515         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 516                 toremote(targ, argc, argv);
 517         else {
 518                 if (targetshouldbedirectory)
 519                         verifydir(argv[argc - 1]);
 520                 tolocal(argc, argv);    /* Dest is local host. */
 521         }
 522         /*
 523          * Finally check the exit status of the ssh process, if one was forked
 524          * and no error has occurred yet
 525          */
 526         if (do_cmd_pid != -1 && errs == 0) {
 527                 if (remin != -1)
 528                     (void) close(remin);
 529                 if (remout != -1)
 530                     (void) close(remout);
 531                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 532                         errs = 1;
 533                 else {
 534                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 535                                 errs = 1;
 536                 }
 537         }
 538         exit(errs != 0);
 539 }
 540
 541 /* Callback from atomicio6 to update progress meter and limit bandwidth */
 542 static int
 543 scpio(void *_cnt, size_t s)
 544 {
 545         off_t *cnt = (off_t *)_cnt;
 546
 547         *cnt += s;
 548         if (limit_kbps > 0)
 549                 bandwidth_limit(&bwlimit, s);
 550         return 0;
 551 }
 552
 553 static int
 554 do_times(int fd, int verb, const struct stat *sb)
 555 {
 556         /* strlen(2^64) == 20; strlen(10^6) == 7 */
 557         char buf[(20 + 7 + 2) * 2 + 2];
 558
 559         (void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
 560             (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
 561             (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
 562         if (verb) {
 563                 fprintf(stderr, "File mtime %lld atime %lld\n",
 564                     (long long)sb->st_mtime, (long long)sb->st_atime);
 565                 fprintf(stderr, "Sending file timestamps: %s", buf);
 566         }
 567         (void) atomicio(vwrite, fd, buf, strlen(buf));
 568         return (response());
 569 }
 570
 571 void
 572 toremote(char *targ, int argc, char **argv)
 573 {
 574         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 575         arglist alist;
 576         int i;
 577         u_int j;
 578
 579         memset(&alist, '\0', sizeof(alist));
 580         alist.list = NULL;
 581
 582         *targ++ = 0;
 583         if (*targ == 0)
 584                 targ = ".";
 585
 586         arg = xstrdup(argv[argc - 1]);
 587         if ((thost = strrchr(arg, '@'))) {
 588                 /* user@host */
 589                 *thost++ = 0;
 590                 tuser = arg;
 591                 if (*tuser == '\0')
 592                         tuser = NULL;
 593         } else {
 594                 thost = arg;
 595                 tuser = NULL;
 596         }
 597
 598         if (tuser != NULL && !okname(tuser)) {
 599                 free(arg);
 600                 return;
 601         }
 602
 603         for (i = 0; i < argc - 1; i++) {
 604                 src = colon(argv[i]);
 605                 if (src && throughlocal) {      /* extended remote to remote */
 606                         *src++ = 0;
 607                         if (*src == 0)
 608                                 src = ".";
 609                         host = strrchr(argv[i], '@');
 610                         if (host) {
 611                                 *host++ = 0;
 612                                 host = cleanhostname(host);
 613                                 suser = argv[i];
 614                                 if (*suser == '\0')
 615                                         suser = pwd->pw_name;
 616                                 else if (!okname(suser))
 617                                         continue;
 618                         } else {
 619                                 host = cleanhostname(argv[i]);
 620                                 suser = NULL;
 621                         }
 622                         xasprintf(&bp, "%s -f %s%s", cmd,
 623                             *src == '-' ? "-- " : "", src);
 624                         if (do_cmd(host, suser, bp, &remin, &remout) < 0)
 625                                 exit(1);
 626                         free(bp);
 627                         host = cleanhostname(thost);
 628                         xasprintf(&bp, "%s -t %s%s", cmd,
 629                             *targ == '-' ? "-- " : "", targ);
 630                         if (do_cmd2(host, tuser, bp, remin, remout) < 0)
 631                                 exit(1);
 632                         free(bp);
 633                         (void) close(remin);
 634                         (void) close(remout);
 635                         remin = remout = -1;
 636                 } else if (src) {       /* standard remote to remote */
 637                         freeargs(&alist);
 638                         addargs(&alist, "%s", ssh_program);
 639                         addargs(&alist, "-x");
 640                         addargs(&alist, "-oClearAllForwardings=yes");
 641                         addargs(&alist, "-n");
 642                         for (j = 0; j < remote_remote_args.num; j++) {
 643                                 addargs(&alist, "%s",
 644                                     remote_remote_args.list[j]);
 645                         }
 646                         *src++ = 0;
 647                         if (*src == 0)
 648                                 src = ".";
 649                         host = strrchr(argv[i], '@');
 650
 651                         if (host) {
 652                                 *host++ = 0;
 653                                 host = cleanhostname(host);
 654                                 suser = argv[i];
 655                                 if (*suser == '\0')
 656                                         suser = pwd->pw_name;
 657                                 else if (!okname(suser))
 658                                         continue;
 659                                 addargs(&alist, "-l");
 660                                 addargs(&alist, "%s", suser);
 661                         } else {
 662                                 host = cleanhostname(argv[i]);
 663                         }
 664                         addargs(&alist, "--");
 665                         addargs(&alist, "%s", host);
 666                         addargs(&alist, "%s", cmd);
 667                         addargs(&alist, "%s", src);
 668                         addargs(&alist, "%s%s%s:%s",
 669                             tuser ? tuser : "", tuser ? "@" : "",
 670                             thost, targ);
 671                         if (do_local_cmd(&alist) != 0)
 672                                 errs = 1;
 673                 } else {        /* local to remote */
 674                         if (remin == -1) {
 675                                 xasprintf(&bp, "%s -t %s%s", cmd,
 676                                     *targ == '-' ? "-- " : "", targ);
 677                                 host = cleanhostname(thost);
 678                                 if (do_cmd(host, tuser, bp, &remin,
 679                                     &remout) < 0)
 680                                         exit(1);
 681                                 if (response() < 0)
 682                                         exit(1);
 683                                 free(bp);
 684                         }
 685                         source(1, argv + i);
 686                 }
 687         }
 688         free(arg);
 689 }
 690
 691 void
 692 tolocal(int argc, char **argv)
 693 {
 694         char *bp, *host, *src, *suser;
 695         arglist alist;
 696         int i;
 697
 698         memset(&alist, '\0', sizeof(alist));
 699         alist.list = NULL;
 700
 701         for (i = 0; i < argc - 1; i++) {
 702                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 703                         freeargs(&alist);
 704                         addargs(&alist, "%s", _PATH_CP);
 705                         if (iamrecursive)
 706                                 addargs(&alist, "-r");
 707                         if (pflag)
 708                                 addargs(&alist, "-p");
 709                         addargs(&alist, "--");
 710                         addargs(&alist, "%s", argv[i]);
 711                         addargs(&alist, "%s", argv[argc-1]);
 712                         if (do_local_cmd(&alist))
 713                                 ++errs;
 714                         continue;
 715                 }
 716                 *src++ = 0;
 717                 if (*src == 0)
 718                         src = ".";
 719                 if ((host = strrchr(argv[i], '@')) == NULL) {
 720                         host = argv[i];
 721                         suser = NULL;
 722                 } else {
 723                         *host++ = 0;
 724                         suser = argv[i];
 725                         if (*suser == '\0')
 726                                 suser = pwd->pw_name;
 727                 }
 728                 host = cleanhostname(host);
 729                 xasprintf(&bp, "%s -f %s%s",
 730                     cmd, *src == '-' ? "-- " : "", src);
 731                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 732                         free(bp);
 733                         ++errs;
 734                         continue;
 735                 }
 736                 free(bp);
 737                 sink(1, argv + argc - 1);
 738                 (void) close(remin);
 739                 remin = remout = -1;
 740         }
 741 }
 742
 743 void
 744 source(int argc, char **argv)
 745 {
 746         struct stat stb;
 747         static BUF buffer;
 748         BUF *bp;
 749         off_t i, statbytes;
 750         size_t amt, nr;
 751         int fd = -1, haderr, indx;
 752         char *last, *name, buf[2048], encname[MAXPATHLEN];
 753         int len;
 754
 755         for (indx = 0; indx < argc; ++indx) {
 756                 name = argv[indx];
 757                 statbytes = 0;
 758                 len = strlen(name);
 759                 while (len > 1 && name[len-1] == '/')
 760                         name[--len] = '\0';
 761                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 762                         goto syserr;
 763                 if (strchr(name, '\n') != NULL) {
 764                         strnvis(encname, name, sizeof(encname), VIS_NL);
 765                         name = encname;
 766                 }
 767                 if (fstat(fd, &stb) < 0) {
 768 syserr:                 run_err("%s: %s", name, strerror(errno));
 769                         goto next;
 770                 }
 771                 if (stb.st_size < 0) {
 772                         run_err("%s: %s", name, "Negative file size");
 773                         goto next;
 774                 }
 775                 unset_nonblock(fd);
 776                 switch (stb.st_mode & S_IFMT) {
 777                 case S_IFREG:
 778                         break;
 779                 case S_IFDIR:
 780                         if (iamrecursive) {
 781                                 rsource(name, &stb);
 782                                 goto next;
 783                         }
 784                         /* FALLTHROUGH */
 785                 default:
 786                         run_err("%s: not a regular file", name);
 787                         goto next;
 788                 }
 789                 if ((last = strrchr(name, '/')) == NULL)
 790                         last = name;
 791                 else
 792                         ++last;
 793                 curfile = last;
 794                 if (pflag) {
 795                         if (do_times(remout, verbose_mode, &stb) < 0)
 796                                 goto next;
 797                 }
 798 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 799                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 800                     (u_int) (stb.st_mode & FILEMODEMASK),
 801                     (long long)stb.st_size, last);
 802                 if (verbose_mode) {
 803                         fprintf(stderr, "Sending file modes: %s", buf);
 804                 }
 805                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 806                 if (response() < 0)
 807                         goto next;
 808                 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
 809 next:                   if (fd != -1) {
 810                                 (void) close(fd);
 811                                 fd = -1;
 812                         }
 813                         continue;
 814                 }
 815                 if (showprogress)
 816                         start_progress_meter(curfile, stb.st_size, &statbytes);
 817                 set_nonblock(remout);
 818                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 819                         amt = bp->cnt;
 820                         if (i + (off_t)amt > stb.st_size)
 821                                 amt = stb.st_size - i;
 822                         if (!haderr) {
 823                                 if ((nr = atomicio(read, fd,
 824                                     bp->buf, amt)) != amt) {
 825                                         haderr = errno;
 826                                         memset(bp->buf + nr, 0, amt - nr);
 827                                 }
 828                         }
 829                         /* Keep writing after error to retain sync */
 830                         if (haderr) {
 831                                 (void)atomicio(vwrite, remout, bp->buf, amt);
 832                                 memset(bp->buf, 0, amt);
 833                                 continue;
 834                         }
 835                         if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
 836                             &statbytes) != amt)
 837                                 haderr = errno;
 838                 }
 839                 unset_nonblock(remout);
 840                 if (showprogress)
 841                         stop_progress_meter();
 842
 843                 if (fd != -1) {
 844                         if (close(fd) < 0 && !haderr)
 845                                 haderr = errno;
 846                         fd = -1;
 847                 }
 848                 if (!haderr)
 849                         (void) atomicio(vwrite, remout, "", 1);
 850                 else
 851                         run_err("%s: %s", name, strerror(haderr));
 852                 (void) response();
 853         }
 854 }
 855
 856 void
 857 rsource(char *name, struct stat *statp)
 858 {
 859         DIR *dirp;
 860         struct dirent *dp;
 861         char *last, *vect[1], path[MAXPATHLEN];
 862
 863         if (!(dirp = opendir(name))) {
 864                 run_err("%s: %s", name, strerror(errno));
 865                 return;
 866         }
 867         last = strrchr(name, '/');
 868         if (last == 0)
 869                 last = name;
 870         else
 871                 last++;
 872         if (pflag) {
 873                 if (do_times(remout, verbose_mode, statp) < 0) {
 874                         closedir(dirp);
 875                         return;
 876                 }
 877         }
 878         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 879             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 880         if (verbose_mode)
 881                 fprintf(stderr, "Entering directory: %s", path);
 882         (void) atomicio(vwrite, remout, path, strlen(path));
 883         if (response() < 0) {
 884                 closedir(dirp);
 885                 return;
 886         }
 887         while ((dp = readdir(dirp)) != NULL) {
 888                 if (dp->d_ino == 0)
 889                         continue;
 890                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 891                         continue;
 892                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 893                         run_err("%s/%s: name too long", name, dp->d_name);
 894                         continue;
 895                 }
 896                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 897                 vect[0] = path;
 898                 source(1, vect);
 899         }
 900         (void) closedir(dirp);
 901         (void) atomicio(vwrite, remout, "E\n", 2);
 902         (void) response();
 903 }
 904
 905 void
 906 sink(int argc, char **argv)
 907 {
 908         static BUF buffer;
 909         struct stat stb;
 910         enum {
 911                 YES, NO, DISPLAYED
 912         } wrerr;
 913         BUF *bp;
 914         off_t i;
 915         size_t j, count;
 916         int amt, exists, first, ofd;
 917         mode_t mode, omode, mask;
 918         off_t size, statbytes;
 919         unsigned long long ull;
 920         int setimes, targisdir, wrerrno = 0;
 921         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 922         struct timeval tv[2];
 923
 924 #define atime   tv[0]
 925 #define mtime   tv[1]
 926 #define SCREWUP(str)    { why = str; goto screwup; }
 927
 928         setimes = targisdir = 0;
 929         mask = umask(0);
 930         if (!pflag)
 931                 (void) umask(mask);
 932         if (argc != 1) {
 933                 run_err("ambiguous target");
 934                 exit(1);
 935         }
 936         targ = *argv;
 937         if (targetshouldbedirectory)
 938                 verifydir(targ);
 939
 940         (void) atomicio(vwrite, remout, "", 1);
 941         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 942                 targisdir = 1;
 943         for (first = 1;; first = 0) {
 944                 cp = buf;
 945                 if (atomicio(read, remin, cp, 1) != 1)
 946                         return;
 947                 if (*cp++ == '\n')
 948                         SCREWUP("unexpected <newline>");
 949                 do {
 950                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 951                                 SCREWUP("lost connection");
 952                         *cp++ = ch;
 953                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 954                 *cp = 0;
 955                 if (verbose_mode)
 956                         fprintf(stderr, "Sink: %s", buf);
 957
 958                 if (buf[0] == '\01' || buf[0] == '\02') {
 959                         if (iamremote == 0)
 960                                 (void) atomicio(vwrite, STDERR_FILENO,
 961                                     buf + 1, strlen(buf + 1));
 962                         if (buf[0] == '\02')
 963                                 exit(1);
 964                         ++errs;
 965                         continue;
 966                 }
 967                 if (buf[0] == 'E') {
 968                         (void) atomicio(vwrite, remout, "", 1);
 969                         return;
 970                 }
 971                 if (ch == '\n')
 972                         *--cp = 0;
 973
 974                 cp = buf;
 975                 if (*cp == 'T') {
 976                         setimes++;
 977                         cp++;
 978                         if (!isdigit((unsigned char)*cp))
 979                                 SCREWUP("mtime.sec not present");
 980                         ull = strtoull(cp, &cp, 10);
 981                         if (!cp || *cp++ != ' ')
 982                                 SCREWUP("mtime.sec not delimited");
 983                         if ((time_t)ull < 0 ||
 984                             (unsigned long long)(time_t)ull != ull)
 985                                 setimes = 0;    /* out of range */
 986                         mtime.tv_sec = ull;
 987                         mtime.tv_usec = strtol(cp, &cp, 10);
 988                         if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
 989                             mtime.tv_usec > 999999)
 990                                 SCREWUP("mtime.usec not delimited");
 991                         if (!isdigit((unsigned char)*cp))
 992                                 SCREWUP("atime.sec not present");
 993                         ull = strtoull(cp, &cp, 10);
 994                         if (!cp || *cp++ != ' ')
 995                                 SCREWUP("atime.sec not delimited");
 996                         if ((time_t)ull < 0 ||
 997                             (unsigned long long)(time_t)ull != ull)
 998                                 setimes = 0;    /* out of range */
 999                         atime.tv_sec = ull;
1000                         atime.tv_usec = strtol(cp, &cp, 10);
1001                         if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1002                             atime.tv_usec > 999999)
1003                                 SCREWUP("atime.usec not delimited");
1004                         (void) atomicio(vwrite, remout, "", 1);
1005                         continue;
1006                 }
1007                 if (*cp != 'C' && *cp != 'D') {
1008                         /*
1009                          * Check for the case "rcp remote:foo\* local:bar".
1010                          * In this case, the line "No match." can be returned
1011                          * by the shell before the rcp command on the remote is
1012                          * executed so the ^Aerror_message convention isn't
1013                          * followed.
1014                          */
1015                         if (first) {
1016                                 run_err("%s", cp);
1017                                 exit(1);
1018                         }
1019                         SCREWUP("expected control record");
1020                 }
1021                 mode = 0;
1022                 for (++cp; cp < buf + 5; cp++) {
1023                         if (*cp < '0' || *cp > '7')
1024                                 SCREWUP("bad mode");
1025                         mode = (mode << 3) | (*cp - '0');
1026                 }
1027                 if (*cp++ != ' ')
1028                         SCREWUP("mode not delimited");
1029
1030                 for (size = 0; isdigit((unsigned char)*cp);)
1031                         size = size * 10 + (*cp++ - '0');
1032                 if (*cp++ != ' ')
1033                         SCREWUP("size not delimited");
1034                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1035                         run_err("error: unexpected filename: %s", cp);
1036                         exit(1);
1037                 }
1038                 if (targisdir) {
1039                         static char *namebuf;
1040                         static size_t cursize;
1041                         size_t need;
1042
1043                         need = strlen(targ) + strlen(cp) + 250;
1044                         if (need > cursize) {
1045                                 free(namebuf);
1046                                 namebuf = xmalloc(need);
1047                                 cursize = need;
1048                         }
1049                         (void) snprintf(namebuf, need, "%s%s%s", targ,
1050                             strcmp(targ, "/") ? "/" : "", cp);
1051                         np = namebuf;
1052                 } else
1053                         np = targ;
1054                 curfile = cp;
1055                 exists = stat(np, &stb) == 0;
1056                 if (buf[0] == 'D') {
1057                         int mod_flag = pflag;
1058                         if (!iamrecursive)
1059                                 SCREWUP("received directory without -r");
1060                         if (exists) {
1061                                 if (!S_ISDIR(stb.st_mode)) {
1062                                         errno = ENOTDIR;
1063                                         goto bad;
1064                                 }
1065                                 if (pflag)
1066                                         (void) chmod(np, mode);
1067                         } else {
1068                                 /* Handle copying from a read-only
1069                                    directory */
1070                                 mod_flag = 1;
1071                                 if (mkdir(np, mode | S_IRWXU) < 0)
1072                                         goto bad;
1073                         }
1074                         vect[0] = xstrdup(np);
1075                         sink(1, vect);
1076                         if (setimes) {
1077                                 setimes = 0;
1078                                 if (utimes(vect[0], tv) < 0)
1079                                         run_err("%s: set times: %s",
1080                                             vect[0], strerror(errno));
1081                         }
1082                         if (mod_flag)
1083                                 (void) chmod(vect[0], mode);
1084                         free(vect[0]);
1085                         continue;
1086                 }
1087                 omode = mode;
1088                 mode |= S_IWUSR;
1089                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1090 bad:                    run_err("%s: %s", np, strerror(errno));
1091                         continue;
1092                 }
1093                 (void) atomicio(vwrite, remout, "", 1);
1094                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1095                         (void) close(ofd);
1096                         continue;
1097                 }
1098                 cp = bp->buf;
1099                 wrerr = NO;
1100
1101                 statbytes = 0;
1102                 if (showprogress)
1103                         start_progress_meter(curfile, size, &statbytes);
1104                 set_nonblock(remin);
1105                 for (count = i = 0; i < size; i += bp->cnt) {
1106                         amt = bp->cnt;
1107                         if (i + amt > size)
1108                                 amt = size - i;
1109                         count += amt;
1110                         do {
1111                                 j = atomicio6(read, remin, cp, amt,
1112                                     scpio, &statbytes);
1113                                 if (j == 0) {
1114                                         run_err("%s", j != EPIPE ?
1115                                             strerror(errno) :
1116                                             "dropped connection");
1117                                         exit(1);
1118                                 }
1119                                 amt -= j;
1120                                 cp += j;
1121                         } while (amt > 0);
1122
1123                         if (count == bp->cnt) {
1124                                 /* Keep reading so we stay sync'd up. */
1125                                 if (wrerr == NO) {
1126                                         if (atomicio(vwrite, ofd, bp->buf,
1127                                             count) != count) {
1128                                                 wrerr = YES;
1129                                                 wrerrno = errno;
1130                                         }
1131                                 }
1132                                 count = 0;
1133                                 cp = bp->buf;
1134                         }
1135                 }
1136                 unset_nonblock(remin);
1137                 if (showprogress)
1138                         stop_progress_meter();
1139                 if (count != 0 && wrerr == NO &&
1140                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1141                         wrerr = YES;
1142                         wrerrno = errno;
1143                 }
1144                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1145                     ftruncate(ofd, size) != 0) {
1146                         run_err("%s: truncate: %s", np, strerror(errno));
1147                         wrerr = DISPLAYED;
1148                 }
1149                 if (pflag) {
1150                         if (exists || omode != mode)
1151 #ifdef HAVE_FCHMOD
1152                                 if (fchmod(ofd, omode)) {
1153 #else /* HAVE_FCHMOD */
1154                                 if (chmod(np, omode)) {
1155 #endif /* HAVE_FCHMOD */
1156                                         run_err("%s: set mode: %s",
1157                                             np, strerror(errno));
1158                                         wrerr = DISPLAYED;
1159                                 }
1160                 } else {
1161                         if (!exists && omode != mode)
1162 #ifdef HAVE_FCHMOD
1163                                 if (fchmod(ofd, omode & ~mask)) {
1164 #else /* HAVE_FCHMOD */
1165                                 if (chmod(np, omode & ~mask)) {
1166 #endif /* HAVE_FCHMOD */
1167                                         run_err("%s: set mode: %s",
1168                                             np, strerror(errno));
1169                                         wrerr = DISPLAYED;
1170                                 }
1171                 }
1172                 if (close(ofd) == -1) {
1173                         wrerr = YES;
1174                         wrerrno = errno;
1175                 }
1176                 (void) response();
1177                 if (setimes && wrerr == NO) {
1178                         setimes = 0;
1179                         if (utimes(np, tv) < 0) {
1180                                 run_err("%s: set times: %s",
1181                                     np, strerror(errno));
1182                                 wrerr = DISPLAYED;
1183                         }
1184                 }
1185                 switch (wrerr) {
1186                 case YES:
1187                         run_err("%s: %s", np, strerror(wrerrno));
1188                         break;
1189                 case NO:
1190                         (void) atomicio(vwrite, remout, "", 1);
1191                         break;
1192                 case DISPLAYED:
1193                         break;
1194                 }
1195         }
1196 screwup:
1197         run_err("protocol error: %s", why);
1198         exit(1);
1199 }
1200
1201 int
1202 response(void)
1203 {
1204         char ch, *cp, resp, rbuf[2048];
1205
1206         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1207                 lostconn(0);
1208
1209         cp = rbuf;
1210         switch (resp) {
1211         case 0:         /* ok */
1212                 return (0);
1213         default:
1214                 *cp++ = resp;
1215                 /* FALLTHROUGH */
1216         case 1:         /* error, followed by error msg */
1217         case 2:         /* fatal error, "" */
1218                 do {
1219                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1220                                 lostconn(0);
1221                         *cp++ = ch;
1222                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1223
1224                 if (!iamremote)
1225                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1226                 ++errs;
1227                 if (resp == 1)
1228                         return (-1);
1229                 exit(1);
1230         }
1231         /* NOTREACHED */
1232 }
1233
1234 void
1235 usage(void)
1236 {
1237         (void) fprintf(stderr,
1238             "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1239             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1240             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1241         exit(1);
1242 }
1243
1244 void
1245 run_err(const char *fmt,...)
1246 {
1247         static FILE *fp;
1248         va_list ap;
1249
1250         ++errs;
1251         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1252                 (void) fprintf(fp, "%c", 0x01);
1253                 (void) fprintf(fp, "scp: ");
1254                 va_start(ap, fmt);
1255                 (void) vfprintf(fp, fmt, ap);
1256                 va_end(ap);
1257                 (void) fprintf(fp, "\n");
1258                 (void) fflush(fp);
1259         }
1260
1261         if (!iamremote) {
1262                 va_start(ap, fmt);
1263                 vfprintf(stderr, fmt, ap);
1264                 va_end(ap);
1265                 fprintf(stderr, "\n");
1266         }
1267 }
1268
1269 void
1270 verifydir(char *cp)
1271 {
1272         struct stat stb;
1273
1274         if (!stat(cp, &stb)) {
1275                 if (S_ISDIR(stb.st_mode))
1276                         return;
1277                 errno = ENOTDIR;
1278         }
1279         run_err("%s: %s", cp, strerror(errno));
1280         killchild(0);
1281 }
1282
1283 int
1284 okname(char *cp0)
1285 {
1286         int c;
1287         char *cp;
1288
1289         cp = cp0;
1290         do {
1291                 c = (int)*cp;
1292                 if (c & 0200)
1293                         goto bad;
1294                 if (!isalpha(c) && !isdigit((unsigned char)c)) {
1295                         switch (c) {
1296                         case '\'':
1297                         case '"':
1298                         case '`':
1299                         case ' ':
1300                         case '#':
1301                                 goto bad;
1302                         default:
1303                                 break;
1304                         }
1305                 }
1306         } while (*++cp);
1307         return (1);
1308
1309 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1310         return (0);
1311 }
1312
1313 BUF *
1314 allocbuf(BUF *bp, int fd, int blksize)
1315 {
1316         size_t size;
1317 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1318         struct stat stb;
1319
1320         if (fstat(fd, &stb) < 0) {
1321                 run_err("fstat: %s", strerror(errno));
1322                 return (0);
1323         }
1324         size = roundup(stb.st_blksize, blksize);
1325         if (size == 0)
1326                 size = blksize;
1327 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1328         size = blksize;
1329 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1330         if (bp->cnt >= size)
1331                 return (bp);
1332         if (bp->buf == NULL)
1333                 bp->buf = xmalloc(size);
1334         else
1335                 bp->buf = xrealloc(bp->buf, 1, size);
1336         memset(bp->buf, 0, size);
1337         bp->cnt = size;
1338         return (bp);
1339 }
1340
1341 void
1342 lostconn(int signo)
1343 {
1344         if (!iamremote)
1345                 (void)write(STDERR_FILENO, "lost connection\n", 16);
1346         if (signo)
1347                 _exit(1);
1348         else
1349                 exit(1);
1350 }