crypto/openssh/scp.c

   1 /* $OpenBSD: scp.c,v 1.186 2016/05/25 23:48:45 schwarze 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 <limits.h>
  99 #include <locale.h>
 100 #include <pwd.h>
 101 #include <signal.h>
 102 #include <stdarg.h>
 103 #include <stdio.h>
 104 #include <stdlib.h>
 105 #include <string.h>
 106 #include <time.h>
 107 #include <unistd.h>
 108 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
 109 #include <vis.h>
 110 #endif
 111
 112 #include "xmalloc.h"
 113 #include "atomicio.h"
 114 #include "pathnames.h"
 115 #include "log.h"
 116 #include "misc.h"
 117 #include "progressmeter.h"
 118 #include "utf8.h"
 119
 120 extern char *__progname;
 121
 122 #define COPY_BUFLEN     16384
 123
 124 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 125 int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
 126
 127 /* Struct for addargs */
 128 arglist args;
 129 arglist remote_remote_args;
 130
 131 /* Bandwidth limit */
 132 long long limit_kbps = 0;
 133 struct bwlimit bwlimit;
 134
 135 /* Name of current file being transferred. */
 136 char *curfile;
 137
 138 /* This is set to non-zero to enable verbose mode. */
 139 int verbose_mode = 0;
 140
 141 /* This is set to zero if the progressmeter is not desired. */
 142 int showprogress = 1;
 143
 144 /*
 145  * This is set to non-zero if remote-remote copy should be piped
 146  * through this process.
 147  */
 148 int throughlocal = 0;
 149
 150 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 151 char *ssh_program = _PATH_SSH_PROGRAM;
 152
 153 /* This is used to store the pid of ssh_program */
 154 pid_t do_cmd_pid = -1;
 155
 156 static void
 157 killchild(int signo)
 158 {
 159         if (do_cmd_pid > 1) {
 160                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 161                 waitpid(do_cmd_pid, NULL, 0);
 162         }
 163
 164         if (signo)
 165                 _exit(1);
 166         exit(1);
 167 }
 168
 169 static void
 170 suspchild(int signo)
 171 {
 172         int status;
 173
 174         if (do_cmd_pid > 1) {
 175                 kill(do_cmd_pid, signo);
 176                 while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
 177                     errno == EINTR)
 178                         ;
 179                 kill(getpid(), SIGSTOP);
 180         }
 181 }
 182
 183 static int
 184 do_local_cmd(arglist *a)
 185 {
 186         u_int i;
 187         int status;
 188         pid_t pid;
 189
 190         if (a->num == 0)
 191                 fatal("do_local_cmd: no arguments");
 192
 193         if (verbose_mode) {
 194                 fprintf(stderr, "Executing:");
 195                 for (i = 0; i < a->num; i++)
 196                         fmprintf(stderr, " %s", a->list[i]);
 197                 fprintf(stderr, "\n");
 198         }
 199         if ((pid = fork()) == -1)
 200                 fatal("do_local_cmd: fork: %s", strerror(errno));
 201
 202         if (pid == 0) {
 203                 execvp(a->list[0], a->list);
 204                 perror(a->list[0]);
 205                 exit(1);
 206         }
 207
 208         do_cmd_pid = pid;
 209         signal(SIGTERM, killchild);
 210         signal(SIGINT, killchild);
 211         signal(SIGHUP, killchild);
 212
 213         while (waitpid(pid, &status, 0) == -1)
 214                 if (errno != EINTR)
 215                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 216
 217         do_cmd_pid = -1;
 218
 219         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 220                 return (-1);
 221
 222         return (0);
 223 }
 224
 225 /*
 226  * This function executes the given command as the specified user on the
 227  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 228  * assigns the input and output file descriptors on success.
 229  */
 230
 231 int
 232 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 233 {
 234         int pin[2], pout[2], reserved[2];
 235
 236         if (verbose_mode)
 237                 fmprintf(stderr,
 238                     "Executing: program %s host %s, user %s, command %s\n",
 239                     ssh_program, host,
 240                     remuser ? remuser : "(unspecified)", cmd);
 241
 242         /*
 243          * Reserve two descriptors so that the real pipes won't get
 244          * descriptors 0 and 1 because that will screw up dup2 below.
 245          */
 246         if (pipe(reserved) < 0)
 247                 fatal("pipe: %s", strerror(errno));
 248
 249         /* Create a socket pair for communicating with ssh. */
 250         if (pipe(pin) < 0)
 251                 fatal("pipe: %s", strerror(errno));
 252         if (pipe(pout) < 0)
 253                 fatal("pipe: %s", strerror(errno));
 254
 255         /* Free the reserved descriptors. */
 256         close(reserved[0]);
 257         close(reserved[1]);
 258
 259         signal(SIGTSTP, suspchild);
 260         signal(SIGTTIN, suspchild);
 261         signal(SIGTTOU, suspchild);
 262
 263         /* Fork a child to execute the command on the remote host using ssh. */
 264         do_cmd_pid = fork();
 265         if (do_cmd_pid == 0) {
 266                 /* Child. */
 267                 close(pin[1]);
 268                 close(pout[0]);
 269                 dup2(pin[0], 0);
 270                 dup2(pout[1], 1);
 271                 close(pin[0]);
 272                 close(pout[1]);
 273
 274                 replacearg(&args, 0, "%s", ssh_program);
 275                 if (remuser != NULL) {
 276                         addargs(&args, "-l");
 277                         addargs(&args, "%s", remuser);
 278                 }
 279                 addargs(&args, "--");
 280                 addargs(&args, "%s", host);
 281                 addargs(&args, "%s", cmd);
 282
 283                 execvp(ssh_program, args.list);
 284                 perror(ssh_program);
 285                 exit(1);
 286         } else if (do_cmd_pid == -1) {
 287                 fatal("fork: %s", strerror(errno));
 288         }
 289         /* Parent.  Close the other side, and return the local side. */
 290         close(pin[0]);
 291         *fdout = pin[1];
 292         close(pout[1]);
 293         *fdin = pout[0];
 294         signal(SIGTERM, killchild);
 295         signal(SIGINT, killchild);
 296         signal(SIGHUP, killchild);
 297         return 0;
 298 }
 299
 300 /*
 301  * This functions executes a command simlar to do_cmd(), but expects the
 302  * input and output descriptors to be setup by a previous call to do_cmd().
 303  * This way the input and output of two commands can be connected.
 304  */
 305 int
 306 do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
 307 {
 308         pid_t pid;
 309         int status;
 310
 311         if (verbose_mode)
 312                 fmprintf(stderr,
 313                     "Executing: 2nd program %s host %s, user %s, command %s\n",
 314                     ssh_program, host,
 315                     remuser ? remuser : "(unspecified)", cmd);
 316
 317         /* Fork a child to execute the command on the remote host using ssh. */
 318         pid = fork();
 319         if (pid == 0) {
 320                 dup2(fdin, 0);
 321                 dup2(fdout, 1);
 322
 323                 replacearg(&args, 0, "%s", ssh_program);
 324                 if (remuser != NULL) {
 325                         addargs(&args, "-l");
 326                         addargs(&args, "%s", remuser);
 327                 }
 328                 addargs(&args, "--");
 329                 addargs(&args, "%s", host);
 330                 addargs(&args, "%s", cmd);
 331
 332                 execvp(ssh_program, args.list);
 333                 perror(ssh_program);
 334                 exit(1);
 335         } else if (pid == -1) {
 336                 fatal("fork: %s", strerror(errno));
 337         }
 338         while (waitpid(pid, &status, 0) == -1)
 339                 if (errno != EINTR)
 340                         fatal("do_cmd2: waitpid: %s", strerror(errno));
 341         return 0;
 342 }
 343
 344 typedef struct {
 345         size_t cnt;
 346         char *buf;
 347 } BUF;
 348
 349 BUF *allocbuf(BUF *, int, int);
 350 void lostconn(int);
 351 int okname(char *);
 352 void run_err(const char *,...);
 353 void verifydir(char *);
 354
 355 struct passwd *pwd;
 356 uid_t userid;
 357 int errs, remin, remout;
 358 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 359
 360 #define CMDNEEDS        64
 361 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 362
 363 int response(void);
 364 void rsource(char *, struct stat *);
 365 void sink(int, char *[]);
 366 void source(int, char *[]);
 367 void tolocal(int, char *[]);
 368 void toremote(char *, int, char *[]);
 369 void usage(void);
 370
 371 int
 372 main(int argc, char **argv)
 373 {
 374         int ch, fflag, tflag, status, n;
 375         char *targ, **newargv;
 376         const char *errstr;
 377         extern char *optarg;
 378         extern int optind;
 379
 380         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 381         sanitise_stdfd();
 382
 383         setlocale(LC_CTYPE, "");
 384
 385         /* Copy argv, because we modify it */
 386         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 387         for (n = 0; n < argc; n++)
 388                 newargv[n] = xstrdup(argv[n]);
 389         argv = newargv;
 390
 391         __progname = ssh_get_progname(argv[0]);
 392
 393         memset(&args, '\0', sizeof(args));
 394         memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
 395         args.list = remote_remote_args.list = NULL;
 396         addargs(&args, "%s", ssh_program);
 397         addargs(&args, "-x");
 398         addargs(&args, "-oForwardAgent=no");
 399         addargs(&args, "-oPermitLocalCommand=no");
 400         addargs(&args, "-oClearAllForwardings=yes");
 401
 402         fflag = tflag = 0;
 403         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
 404                 switch (ch) {
 405                 /* User-visible flags. */
 406                 case '1':
 407                 case '2':
 408                 case '4':
 409                 case '6':
 410                 case 'C':
 411                         addargs(&args, "-%c", ch);
 412                         addargs(&remote_remote_args, "-%c", ch);
 413                         break;
 414                 case '3':
 415                         throughlocal = 1;
 416                         break;
 417                 case 'o':
 418                 case 'c':
 419                 case 'i':
 420                 case 'F':
 421                         addargs(&remote_remote_args, "-%c", ch);
 422                         addargs(&remote_remote_args, "%s", optarg);
 423                         addargs(&args, "-%c", ch);
 424                         addargs(&args, "%s", optarg);
 425                         break;
 426                 case 'P':
 427                         addargs(&remote_remote_args, "-p");
 428                         addargs(&remote_remote_args, "%s", optarg);
 429                         addargs(&args, "-p");
 430                         addargs(&args, "%s", optarg);
 431                         break;
 432                 case 'B':
 433                         addargs(&remote_remote_args, "-oBatchmode=yes");
 434                         addargs(&args, "-oBatchmode=yes");
 435                         break;
 436                 case 'l':
 437                         limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
 438                             &errstr);
 439                         if (errstr != NULL)
 440                                 usage();
 441                         limit_kbps *= 1024; /* kbps */
 442                         bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
 443                         break;
 444                 case 'p':
 445                         pflag = 1;
 446                         break;
 447                 case 'r':
 448                         iamrecursive = 1;
 449                         break;
 450                 case 'S':
 451                         ssh_program = xstrdup(optarg);
 452                         break;
 453                 case 'v':
 454                         addargs(&args, "-v");
 455                         addargs(&remote_remote_args, "-v");
 456                         verbose_mode = 1;
 457                         break;
 458                 case 'q':
 459                         addargs(&args, "-q");
 460                         addargs(&remote_remote_args, "-q");
 461                         showprogress = 0;
 462                         break;
 463
 464                 /* Server options. */
 465                 case 'd':
 466                         targetshouldbedirectory = 1;
 467                         break;
 468                 case 'f':       /* "from" */
 469                         iamremote = 1;
 470                         fflag = 1;
 471                         break;
 472                 case 't':       /* "to" */
 473                         iamremote = 1;
 474                         tflag = 1;
 475 #ifdef HAVE_CYGWIN
 476                         setmode(0, O_BINARY);
 477 #endif
 478                         break;
 479                 default:
 480                         usage();
 481                 }
 482         argc -= optind;
 483         argv += optind;
 484
 485         if ((pwd = getpwuid(userid = getuid())) == NULL)
 486                 fatal("unknown user %u", (u_int) userid);
 487
 488         if (!isatty(STDOUT_FILENO))
 489                 showprogress = 0;
 490
 491         if (pflag) {
 492                 /* Cannot pledge: -p allows setuid/setgid files... */
 493         } else {
 494                 if (pledge("stdio rpath wpath cpath fattr tty proc exec",
 495                     NULL) == -1) {
 496                         perror("pledge");
 497                         exit(1);
 498                 }
 499         }
 500
 501         remin = STDIN_FILENO;
 502         remout = STDOUT_FILENO;
 503
 504         if (fflag) {
 505                 /* Follow "protocol", send data. */
 506                 (void) response();
 507                 source(argc, argv);
 508                 exit(errs != 0);
 509         }
 510         if (tflag) {
 511                 /* Receive data. */
 512                 sink(argc, argv);
 513                 exit(errs != 0);
 514         }
 515         if (argc < 2)
 516                 usage();
 517         if (argc > 2)
 518                 targetshouldbedirectory = 1;
 519
 520         remin = remout = -1;
 521         do_cmd_pid = -1;
 522         /* Command to be executed on remote system using "ssh". */
 523         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 524             verbose_mode ? " -v" : "",
 525             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 526             targetshouldbedirectory ? " -d" : "");
 527
 528         (void) signal(SIGPIPE, lostconn);
 529
 530         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 531                 toremote(targ, argc, argv);
 532         else {
 533                 if (targetshouldbedirectory)
 534                         verifydir(argv[argc - 1]);
 535                 tolocal(argc, argv);    /* Dest is local host. */
 536         }
 537         /*
 538          * Finally check the exit status of the ssh process, if one was forked
 539          * and no error has occurred yet
 540          */
 541         if (do_cmd_pid != -1 && errs == 0) {
 542                 if (remin != -1)
 543                     (void) close(remin);
 544                 if (remout != -1)
 545                     (void) close(remout);
 546                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 547                         errs = 1;
 548                 else {
 549                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 550                                 errs = 1;
 551                 }
 552         }
 553         exit(errs != 0);
 554 }
 555
 556 /* Callback from atomicio6 to update progress meter and limit bandwidth */
 557 static int
 558 scpio(void *_cnt, size_t s)
 559 {
 560         off_t *cnt = (off_t *)_cnt;
 561
 562         *cnt += s;
 563         if (limit_kbps > 0)
 564                 bandwidth_limit(&bwlimit, s);
 565         return 0;
 566 }
 567
 568 static int
 569 do_times(int fd, int verb, const struct stat *sb)
 570 {
 571         /* strlen(2^64) == 20; strlen(10^6) == 7 */
 572         char buf[(20 + 7 + 2) * 2 + 2];
 573
 574         (void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
 575             (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
 576             (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
 577         if (verb) {
 578                 fprintf(stderr, "File mtime %lld atime %lld\n",
 579                     (long long)sb->st_mtime, (long long)sb->st_atime);
 580                 fprintf(stderr, "Sending file timestamps: %s", buf);
 581         }
 582         (void) atomicio(vwrite, fd, buf, strlen(buf));
 583         return (response());
 584 }
 585
 586 void
 587 toremote(char *targ, int argc, char **argv)
 588 {
 589         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 590         arglist alist;
 591         int i;
 592         u_int j;
 593
 594         memset(&alist, '\0', sizeof(alist));
 595         alist.list = NULL;
 596
 597         *targ++ = 0;
 598         if (*targ == 0)
 599                 targ = ".";
 600
 601         arg = xstrdup(argv[argc - 1]);
 602         if ((thost = strrchr(arg, '@'))) {
 603                 /* user@host */
 604                 *thost++ = 0;
 605                 tuser = arg;
 606                 if (*tuser == '\0')
 607                         tuser = NULL;
 608         } else {
 609                 thost = arg;
 610                 tuser = NULL;
 611         }
 612
 613         if (tuser != NULL && !okname(tuser)) {
 614                 free(arg);
 615                 return;
 616         }
 617
 618         for (i = 0; i < argc - 1; i++) {
 619                 src = colon(argv[i]);
 620                 if (src && throughlocal) {      /* extended remote to remote */
 621                         *src++ = 0;
 622                         if (*src == 0)
 623                                 src = ".";
 624                         host = strrchr(argv[i], '@');
 625                         if (host) {
 626                                 *host++ = 0;
 627                                 host = cleanhostname(host);
 628                                 suser = argv[i];
 629                                 if (*suser == '\0')
 630                                         suser = pwd->pw_name;
 631                                 else if (!okname(suser))
 632                                         continue;
 633                         } else {
 634                                 host = cleanhostname(argv[i]);
 635                                 suser = NULL;
 636                         }
 637                         xasprintf(&bp, "%s -f %s%s", cmd,
 638                             *src == '-' ? "-- " : "", src);
 639                         if (do_cmd(host, suser, bp, &remin, &remout) < 0)
 640                                 exit(1);
 641                         free(bp);
 642                         host = cleanhostname(thost);
 643                         xasprintf(&bp, "%s -t %s%s", cmd,
 644                             *targ == '-' ? "-- " : "", targ);
 645                         if (do_cmd2(host, tuser, bp, remin, remout) < 0)
 646                                 exit(1);
 647                         free(bp);
 648                         (void) close(remin);
 649                         (void) close(remout);
 650                         remin = remout = -1;
 651                 } else if (src) {       /* standard remote to remote */
 652                         freeargs(&alist);
 653                         addargs(&alist, "%s", ssh_program);
 654                         addargs(&alist, "-x");
 655                         addargs(&alist, "-oClearAllForwardings=yes");
 656                         addargs(&alist, "-n");
 657                         for (j = 0; j < remote_remote_args.num; j++) {
 658                                 addargs(&alist, "%s",
 659                                     remote_remote_args.list[j]);
 660                         }
 661                         *src++ = 0;
 662                         if (*src == 0)
 663                                 src = ".";
 664                         host = strrchr(argv[i], '@');
 665
 666                         if (host) {
 667                                 *host++ = 0;
 668                                 host = cleanhostname(host);
 669                                 suser = argv[i];
 670                                 if (*suser == '\0')
 671                                         suser = pwd->pw_name;
 672                                 else if (!okname(suser))
 673                                         continue;
 674                                 addargs(&alist, "-l");
 675                                 addargs(&alist, "%s", suser);
 676                         } else {
 677                                 host = cleanhostname(argv[i]);
 678                         }
 679                         addargs(&alist, "--");
 680                         addargs(&alist, "%s", host);
 681                         addargs(&alist, "%s", cmd);
 682                         addargs(&alist, "%s", src);
 683                         addargs(&alist, "%s%s%s:%s",
 684                             tuser ? tuser : "", tuser ? "@" : "",
 685                             thost, targ);
 686                         if (do_local_cmd(&alist) != 0)
 687                                 errs = 1;
 688                 } else {        /* local to remote */
 689                         if (remin == -1) {
 690                                 xasprintf(&bp, "%s -t %s%s", cmd,
 691                                     *targ == '-' ? "-- " : "", targ);
 692                                 host = cleanhostname(thost);
 693                                 if (do_cmd(host, tuser, bp, &remin,
 694                                     &remout) < 0)
 695                                         exit(1);
 696                                 if (response() < 0)
 697                                         exit(1);
 698                                 free(bp);
 699                         }
 700                         source(1, argv + i);
 701                 }
 702         }
 703         free(arg);
 704 }
 705
 706 void
 707 tolocal(int argc, char **argv)
 708 {
 709         char *bp, *host, *src, *suser;
 710         arglist alist;
 711         int i;
 712
 713         memset(&alist, '\0', sizeof(alist));
 714         alist.list = NULL;
 715
 716         for (i = 0; i < argc - 1; i++) {
 717                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 718                         freeargs(&alist);
 719                         addargs(&alist, "%s", _PATH_CP);
 720                         if (iamrecursive)
 721                                 addargs(&alist, "-r");
 722                         if (pflag)
 723                                 addargs(&alist, "-p");
 724                         addargs(&alist, "--");
 725                         addargs(&alist, "%s", argv[i]);
 726                         addargs(&alist, "%s", argv[argc-1]);
 727                         if (do_local_cmd(&alist))
 728                                 ++errs;
 729                         continue;
 730                 }
 731                 *src++ = 0;
 732                 if (*src == 0)
 733                         src = ".";
 734                 if ((host = strrchr(argv[i], '@')) == NULL) {
 735                         host = argv[i];
 736                         suser = NULL;
 737                 } else {
 738                         *host++ = 0;
 739                         suser = argv[i];
 740                         if (*suser == '\0')
 741                                 suser = pwd->pw_name;
 742                 }
 743                 host = cleanhostname(host);
 744                 xasprintf(&bp, "%s -f %s%s",
 745                     cmd, *src == '-' ? "-- " : "", src);
 746                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 747                         free(bp);
 748                         ++errs;
 749                         continue;
 750                 }
 751                 free(bp);
 752                 sink(1, argv + argc - 1);
 753                 (void) close(remin);
 754                 remin = remout = -1;
 755         }
 756 }
 757
 758 void
 759 source(int argc, char **argv)
 760 {
 761         struct stat stb;
 762         static BUF buffer;
 763         BUF *bp;
 764         off_t i, statbytes;
 765         size_t amt, nr;
 766         int fd = -1, haderr, indx;
 767         char *last, *name, buf[2048], encname[PATH_MAX];
 768         int len;
 769
 770         for (indx = 0; indx < argc; ++indx) {
 771                 name = argv[indx];
 772                 statbytes = 0;
 773                 len = strlen(name);
 774                 while (len > 1 && name[len-1] == '/')
 775                         name[--len] = '\0';
 776                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 777                         goto syserr;
 778                 if (strchr(name, '\n') != NULL) {
 779                         strnvis(encname, name, sizeof(encname), VIS_NL);
 780                         name = encname;
 781                 }
 782                 if (fstat(fd, &stb) < 0) {
 783 syserr:                 run_err("%s: %s", name, strerror(errno));
 784                         goto next;
 785                 }
 786                 if (stb.st_size < 0) {
 787                         run_err("%s: %s", name, "Negative file size");
 788                         goto next;
 789                 }
 790                 unset_nonblock(fd);
 791                 switch (stb.st_mode & S_IFMT) {
 792                 case S_IFREG:
 793                         break;
 794                 case S_IFDIR:
 795                         if (iamrecursive) {
 796                                 rsource(name, &stb);
 797                                 goto next;
 798                         }
 799                         /* FALLTHROUGH */
 800                 default:
 801                         run_err("%s: not a regular file", name);
 802                         goto next;
 803                 }
 804                 if ((last = strrchr(name, '/')) == NULL)
 805                         last = name;
 806                 else
 807                         ++last;
 808                 curfile = last;
 809                 if (pflag) {
 810                         if (do_times(remout, verbose_mode, &stb) < 0)
 811                                 goto next;
 812                 }
 813 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 814                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 815                     (u_int) (stb.st_mode & FILEMODEMASK),
 816                     (long long)stb.st_size, last);
 817                 if (verbose_mode)
 818                         fmprintf(stderr, "Sending file modes: %s", buf);
 819                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 820                 if (response() < 0)
 821                         goto next;
 822                 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
 823 next:                   if (fd != -1) {
 824                                 (void) close(fd);
 825                                 fd = -1;
 826                         }
 827                         continue;
 828                 }
 829                 if (showprogress)
 830                         start_progress_meter(curfile, stb.st_size, &statbytes);
 831                 set_nonblock(remout);
 832                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 833                         amt = bp->cnt;
 834                         if (i + (off_t)amt > stb.st_size)
 835                                 amt = stb.st_size - i;
 836                         if (!haderr) {
 837                                 if ((nr = atomicio(read, fd,
 838                                     bp->buf, amt)) != amt) {
 839                                         haderr = errno;
 840                                         memset(bp->buf + nr, 0, amt - nr);
 841                                 }
 842                         }
 843                         /* Keep writing after error to retain sync */
 844                         if (haderr) {
 845                                 (void)atomicio(vwrite, remout, bp->buf, amt);
 846                                 memset(bp->buf, 0, amt);
 847                                 continue;
 848                         }
 849                         if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
 850                             &statbytes) != amt)
 851                                 haderr = errno;
 852                 }
 853                 unset_nonblock(remout);
 854
 855                 if (fd != -1) {
 856                         if (close(fd) < 0 && !haderr)
 857                                 haderr = errno;
 858                         fd = -1;
 859                 }
 860                 if (!haderr)
 861                         (void) atomicio(vwrite, remout, "", 1);
 862                 else
 863                         run_err("%s: %s", name, strerror(haderr));
 864                 (void) response();
 865                 if (showprogress)
 866                         stop_progress_meter();
 867         }
 868 }
 869
 870 void
 871 rsource(char *name, struct stat *statp)
 872 {
 873         DIR *dirp;
 874         struct dirent *dp;
 875         char *last, *vect[1], path[PATH_MAX];
 876
 877         if (!(dirp = opendir(name))) {
 878                 run_err("%s: %s", name, strerror(errno));
 879                 return;
 880         }
 881         last = strrchr(name, '/');
 882         if (last == NULL)
 883                 last = name;
 884         else
 885                 last++;
 886         if (pflag) {
 887                 if (do_times(remout, verbose_mode, statp) < 0) {
 888                         closedir(dirp);
 889                         return;
 890                 }
 891         }
 892         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 893             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 894         if (verbose_mode)
 895                 fmprintf(stderr, "Entering directory: %s", path);
 896         (void) atomicio(vwrite, remout, path, strlen(path));
 897         if (response() < 0) {
 898                 closedir(dirp);
 899                 return;
 900         }
 901         while ((dp = readdir(dirp)) != NULL) {
 902                 if (dp->d_ino == 0)
 903                         continue;
 904                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 905                         continue;
 906                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 907                         run_err("%s/%s: name too long", name, dp->d_name);
 908                         continue;
 909                 }
 910                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 911                 vect[0] = path;
 912                 source(1, vect);
 913         }
 914         (void) closedir(dirp);
 915         (void) atomicio(vwrite, remout, "E\n", 2);
 916         (void) response();
 917 }
 918
 919 void
 920 sink(int argc, char **argv)
 921 {
 922         static BUF buffer;
 923         struct stat stb;
 924         enum {
 925                 YES, NO, DISPLAYED
 926         } wrerr;
 927         BUF *bp;
 928         off_t i;
 929         size_t j, count;
 930         int amt, exists, first, ofd;
 931         mode_t mode, omode, mask;
 932         off_t size, statbytes;
 933         unsigned long long ull;
 934         int setimes, targisdir, wrerrno = 0;
 935         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
 936         struct timeval tv[2];
 937
 938 #define atime   tv[0]
 939 #define mtime   tv[1]
 940 #define SCREWUP(str)    { why = str; goto screwup; }
 941
 942         setimes = targisdir = 0;
 943         mask = umask(0);
 944         if (!pflag)
 945                 (void) umask(mask);
 946         if (argc != 1) {
 947                 run_err("ambiguous target");
 948                 exit(1);
 949         }
 950         targ = *argv;
 951         if (targetshouldbedirectory)
 952                 verifydir(targ);
 953
 954         (void) atomicio(vwrite, remout, "", 1);
 955         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 956                 targisdir = 1;
 957         for (first = 1;; first = 0) {
 958                 cp = buf;
 959                 if (atomicio(read, remin, cp, 1) != 1)
 960                         return;
 961                 if (*cp++ == '\n')
 962                         SCREWUP("unexpected <newline>");
 963                 do {
 964                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 965                                 SCREWUP("lost connection");
 966                         *cp++ = ch;
 967                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 968                 *cp = 0;
 969                 if (verbose_mode)
 970                         fmprintf(stderr, "Sink: %s", buf);
 971
 972                 if (buf[0] == '\01' || buf[0] == '\02') {
 973                         if (iamremote == 0) {
 974                                 (void) snmprintf(visbuf, sizeof(visbuf),
 975                                     NULL, "%s", buf + 1);
 976                                 (void) atomicio(vwrite, STDERR_FILENO,
 977                                     visbuf, strlen(visbuf));
 978                         }
 979                         if (buf[0] == '\02')
 980                                 exit(1);
 981                         ++errs;
 982                         continue;
 983                 }
 984                 if (buf[0] == 'E') {
 985                         (void) atomicio(vwrite, remout, "", 1);
 986                         return;
 987                 }
 988                 if (ch == '\n')
 989                         *--cp = 0;
 990
 991                 cp = buf;
 992                 if (*cp == 'T') {
 993                         setimes++;
 994                         cp++;
 995                         if (!isdigit((unsigned char)*cp))
 996                                 SCREWUP("mtime.sec not present");
 997                         ull = strtoull(cp, &cp, 10);
 998                         if (!cp || *cp++ != ' ')
 999                                 SCREWUP("mtime.sec not delimited");
1000                         if ((time_t)ull < 0 ||
1001                             (unsigned long long)(time_t)ull != ull)
1002                                 setimes = 0;    /* out of range */
1003                         mtime.tv_sec = ull;
1004                         mtime.tv_usec = strtol(cp, &cp, 10);
1005                         if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
1006                             mtime.tv_usec > 999999)
1007                                 SCREWUP("mtime.usec not delimited");
1008                         if (!isdigit((unsigned char)*cp))
1009                                 SCREWUP("atime.sec not present");
1010                         ull = strtoull(cp, &cp, 10);
1011                         if (!cp || *cp++ != ' ')
1012                                 SCREWUP("atime.sec not delimited");
1013                         if ((time_t)ull < 0 ||
1014                             (unsigned long long)(time_t)ull != ull)
1015                                 setimes = 0;    /* out of range */
1016                         atime.tv_sec = ull;
1017                         atime.tv_usec = strtol(cp, &cp, 10);
1018                         if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1019                             atime.tv_usec > 999999)
1020                                 SCREWUP("atime.usec not delimited");
1021                         (void) atomicio(vwrite, remout, "", 1);
1022                         continue;
1023                 }
1024                 if (*cp != 'C' && *cp != 'D') {
1025                         /*
1026                          * Check for the case "rcp remote:foo\* local:bar".
1027                          * In this case, the line "No match." can be returned
1028                          * by the shell before the rcp command on the remote is
1029                          * executed so the ^Aerror_message convention isn't
1030                          * followed.
1031                          */
1032                         if (first) {
1033                                 run_err("%s", cp);
1034                                 exit(1);
1035                         }
1036                         SCREWUP("expected control record");
1037                 }
1038                 mode = 0;
1039                 for (++cp; cp < buf + 5; cp++) {
1040                         if (*cp < '0' || *cp > '7')
1041                                 SCREWUP("bad mode");
1042                         mode = (mode << 3) | (*cp - '0');
1043                 }
1044                 if (*cp++ != ' ')
1045                         SCREWUP("mode not delimited");
1046
1047                 for (size = 0; isdigit((unsigned char)*cp);)
1048                         size = size * 10 + (*cp++ - '0');
1049                 if (*cp++ != ' ')
1050                         SCREWUP("size not delimited");
1051                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1052                         run_err("error: unexpected filename: %s", cp);
1053                         exit(1);
1054                 }
1055                 if (targisdir) {
1056                         static char *namebuf;
1057                         static size_t cursize;
1058                         size_t need;
1059
1060                         need = strlen(targ) + strlen(cp) + 250;
1061                         if (need > cursize) {
1062                                 free(namebuf);
1063                                 namebuf = xmalloc(need);
1064                                 cursize = need;
1065                         }
1066                         (void) snprintf(namebuf, need, "%s%s%s", targ,
1067                             strcmp(targ, "/") ? "/" : "", cp);
1068                         np = namebuf;
1069                 } else
1070                         np = targ;
1071                 curfile = cp;
1072                 exists = stat(np, &stb) == 0;
1073                 if (buf[0] == 'D') {
1074                         int mod_flag = pflag;
1075                         if (!iamrecursive)
1076                                 SCREWUP("received directory without -r");
1077                         if (exists) {
1078                                 if (!S_ISDIR(stb.st_mode)) {
1079                                         errno = ENOTDIR;
1080                                         goto bad;
1081                                 }
1082                                 if (pflag)
1083                                         (void) chmod(np, mode);
1084                         } else {
1085                                 /* Handle copying from a read-only
1086                                    directory */
1087                                 mod_flag = 1;
1088                                 if (mkdir(np, mode | S_IRWXU) < 0)
1089                                         goto bad;
1090                         }
1091                         vect[0] = xstrdup(np);
1092                         sink(1, vect);
1093                         if (setimes) {
1094                                 setimes = 0;
1095                                 if (utimes(vect[0], tv) < 0)
1096                                         run_err("%s: set times: %s",
1097                                             vect[0], strerror(errno));
1098                         }
1099                         if (mod_flag)
1100                                 (void) chmod(vect[0], mode);
1101                         free(vect[0]);
1102                         continue;
1103                 }
1104                 omode = mode;
1105                 mode |= S_IWUSR;
1106                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1107 bad:                    run_err("%s: %s", np, strerror(errno));
1108                         continue;
1109                 }
1110                 (void) atomicio(vwrite, remout, "", 1);
1111                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1112                         (void) close(ofd);
1113                         continue;
1114                 }
1115                 cp = bp->buf;
1116                 wrerr = NO;
1117
1118                 statbytes = 0;
1119                 if (showprogress)
1120                         start_progress_meter(curfile, size, &statbytes);
1121                 set_nonblock(remin);
1122                 for (count = i = 0; i < size; i += bp->cnt) {
1123                         amt = bp->cnt;
1124                         if (i + amt > size)
1125                                 amt = size - i;
1126                         count += amt;
1127                         do {
1128                                 j = atomicio6(read, remin, cp, amt,
1129                                     scpio, &statbytes);
1130                                 if (j == 0) {
1131                                         run_err("%s", j != EPIPE ?
1132                                             strerror(errno) :
1133                                             "dropped connection");
1134                                         exit(1);
1135                                 }
1136                                 amt -= j;
1137                                 cp += j;
1138                         } while (amt > 0);
1139
1140                         if (count == bp->cnt) {
1141                                 /* Keep reading so we stay sync'd up. */
1142                                 if (wrerr == NO) {
1143                                         if (atomicio(vwrite, ofd, bp->buf,
1144                                             count) != count) {
1145                                                 wrerr = YES;
1146                                                 wrerrno = errno;
1147                                         }
1148                                 }
1149                                 count = 0;
1150                                 cp = bp->buf;
1151                         }
1152                 }
1153                 unset_nonblock(remin);
1154                 if (count != 0 && wrerr == NO &&
1155                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1156                         wrerr = YES;
1157                         wrerrno = errno;
1158                 }
1159                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1160                     ftruncate(ofd, size) != 0) {
1161                         run_err("%s: truncate: %s", np, strerror(errno));
1162                         wrerr = DISPLAYED;
1163                 }
1164                 if (pflag) {
1165                         if (exists || omode != mode)
1166 #ifdef HAVE_FCHMOD
1167                                 if (fchmod(ofd, omode)) {
1168 #else /* HAVE_FCHMOD */
1169                                 if (chmod(np, omode)) {
1170 #endif /* HAVE_FCHMOD */
1171                                         run_err("%s: set mode: %s",
1172                                             np, strerror(errno));
1173                                         wrerr = DISPLAYED;
1174                                 }
1175                 } else {
1176                         if (!exists && omode != mode)
1177 #ifdef HAVE_FCHMOD
1178                                 if (fchmod(ofd, omode & ~mask)) {
1179 #else /* HAVE_FCHMOD */
1180                                 if (chmod(np, omode & ~mask)) {
1181 #endif /* HAVE_FCHMOD */
1182                                         run_err("%s: set mode: %s",
1183                                             np, strerror(errno));
1184                                         wrerr = DISPLAYED;
1185                                 }
1186                 }
1187                 if (close(ofd) == -1) {
1188                         wrerr = YES;
1189                         wrerrno = errno;
1190                 }
1191                 (void) response();
1192                 if (showprogress)
1193                         stop_progress_meter();
1194                 if (setimes && wrerr == NO) {
1195                         setimes = 0;
1196                         if (utimes(np, tv) < 0) {
1197                                 run_err("%s: set times: %s",
1198                                     np, strerror(errno));
1199                                 wrerr = DISPLAYED;
1200                         }
1201                 }
1202                 switch (wrerr) {
1203                 case YES:
1204                         run_err("%s: %s", np, strerror(wrerrno));
1205                         break;
1206                 case NO:
1207                         (void) atomicio(vwrite, remout, "", 1);
1208                         break;
1209                 case DISPLAYED:
1210                         break;
1211                 }
1212         }
1213 screwup:
1214         run_err("protocol error: %s", why);
1215         exit(1);
1216 }
1217
1218 int
1219 response(void)
1220 {
1221         char ch, *cp, resp, rbuf[2048], visbuf[2048];
1222
1223         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1224                 lostconn(0);
1225
1226         cp = rbuf;
1227         switch (resp) {
1228         case 0:         /* ok */
1229                 return (0);
1230         default:
1231                 *cp++ = resp;
1232                 /* FALLTHROUGH */
1233         case 1:         /* error, followed by error msg */
1234         case 2:         /* fatal error, "" */
1235                 do {
1236                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1237                                 lostconn(0);
1238                         *cp++ = ch;
1239                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1240
1241                 if (!iamremote) {
1242                         cp[-1] = '\0';
1243                         (void) snmprintf(visbuf, sizeof(visbuf),
1244                             NULL, "%s\n", rbuf);
1245                         (void) atomicio(vwrite, STDERR_FILENO,
1246                             visbuf, strlen(visbuf));
1247                 }
1248                 ++errs;
1249                 if (resp == 1)
1250                         return (-1);
1251                 exit(1);
1252         }
1253         /* NOTREACHED */
1254 }
1255
1256 void
1257 usage(void)
1258 {
1259         (void) fprintf(stderr,
1260             "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1261             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1262             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1263         exit(1);
1264 }
1265
1266 void
1267 run_err(const char *fmt,...)
1268 {
1269         static FILE *fp;
1270         va_list ap;
1271
1272         ++errs;
1273         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1274                 (void) fprintf(fp, "%c", 0x01);
1275                 (void) fprintf(fp, "scp: ");
1276                 va_start(ap, fmt);
1277                 (void) vfprintf(fp, fmt, ap);
1278                 va_end(ap);
1279                 (void) fprintf(fp, "\n");
1280                 (void) fflush(fp);
1281         }
1282
1283         if (!iamremote) {
1284                 va_start(ap, fmt);
1285                 vfmprintf(stderr, fmt, ap);
1286                 va_end(ap);
1287                 fprintf(stderr, "\n");
1288         }
1289 }
1290
1291 void
1292 verifydir(char *cp)
1293 {
1294         struct stat stb;
1295
1296         if (!stat(cp, &stb)) {
1297                 if (S_ISDIR(stb.st_mode))
1298                         return;
1299                 errno = ENOTDIR;
1300         }
1301         run_err("%s: %s", cp, strerror(errno));
1302         killchild(0);
1303 }
1304
1305 int
1306 okname(char *cp0)
1307 {
1308         int c;
1309         char *cp;
1310
1311         cp = cp0;
1312         do {
1313                 c = (int)*cp;
1314                 if (c & 0200)
1315                         goto bad;
1316                 if (!isalpha(c) && !isdigit((unsigned char)c)) {
1317                         switch (c) {
1318                         case '\'':
1319                         case '"':
1320                         case '`':
1321                         case ' ':
1322                         case '#':
1323                                 goto bad;
1324                         default:
1325                                 break;
1326                         }
1327                 }
1328         } while (*++cp);
1329         return (1);
1330
1331 bad:    fmprintf(stderr, "%s: invalid user name\n", cp0);
1332         return (0);
1333 }
1334
1335 BUF *
1336 allocbuf(BUF *bp, int fd, int blksize)
1337 {
1338         size_t size;
1339 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1340         struct stat stb;
1341
1342         if (fstat(fd, &stb) < 0) {
1343                 run_err("fstat: %s", strerror(errno));
1344                 return (0);
1345         }
1346         size = roundup(stb.st_blksize, blksize);
1347         if (size == 0)
1348                 size = blksize;
1349 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1350         size = blksize;
1351 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1352         if (bp->cnt >= size)
1353                 return (bp);
1354         if (bp->buf == NULL)
1355                 bp->buf = xmalloc(size);
1356         else
1357                 bp->buf = xreallocarray(bp->buf, 1, size);
1358         memset(bp->buf, 0, size);
1359         bp->cnt = size;
1360         return (bp);
1361 }
1362
1363 void
1364 lostconn(int signo)
1365 {
1366         if (!iamremote)
1367                 (void)write(STDERR_FILENO, "lost connection\n", 16);
1368         if (signo)
1369                 _exit(1);
1370         else
1371                 exit(1);
1372 }