crypto/openssh/scp.c

   1 /* $OpenBSD: scp.c,v 1.192 2017/05/31 09:15:42 deraadt 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 #ifdef HAVE_SYS_STAT_H
  78 # include <sys/stat.h>
  79 #endif
  80 #ifdef HAVE_POLL_H
  81 #include <poll.h>
  82 #else
  83 # ifdef HAVE_SYS_POLL_H
  84 #  include <sys/poll.h>
  85 # endif
  86 #endif
  87 #ifdef HAVE_SYS_TIME_H
  88 # include <sys/time.h>
  89 #endif
  90 #include <sys/wait.h>
  91 #include <sys/uio.h>
  92
  93 #include <ctype.h>
  94 #include <dirent.h>
  95 #include <errno.h>
  96 #include <fcntl.h>
  97 #include <limits.h>
  98 #include <locale.h>
  99 #include <pwd.h>
 100 #include <signal.h>
 101 #include <stdarg.h>
 102 #ifdef HAVE_STDINT_H
 103 #include <stdint.h>
 104 #endif
 105 #include <stdio.h>
 106 #include <stdlib.h>
 107 #include <string.h>
 108 #include <time.h>
 109 #include <unistd.h>
 110 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
 111 #include <vis.h>
 112 #endif
 113
 114 #include "xmalloc.h"
 115 #include "atomicio.h"
 116 #include "pathnames.h"
 117 #include "log.h"
 118 #include "misc.h"
 119 #include "progressmeter.h"
 120 #include "utf8.h"
 121
 122 extern char *__progname;
 123
 124 #define COPY_BUFLEN     16384
 125
 126 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 127 int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout);
 128
 129 /* Struct for addargs */
 130 arglist args;
 131 arglist remote_remote_args;
 132
 133 /* Bandwidth limit */
 134 long long limit_kbps = 0;
 135 struct bwlimit bwlimit;
 136
 137 /* Name of current file being transferred. */
 138 char *curfile;
 139
 140 /* This is set to non-zero to enable verbose mode. */
 141 int verbose_mode = 0;
 142
 143 /* This is set to zero if the progressmeter is not desired. */
 144 int showprogress = 1;
 145
 146 /*
 147  * This is set to non-zero if remote-remote copy should be piped
 148  * through this process.
 149  */
 150 int throughlocal = 0;
 151
 152 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 153 char *ssh_program = _PATH_SSH_PROGRAM;
 154
 155 /* This is used to store the pid of ssh_program */
 156 pid_t do_cmd_pid = -1;
 157
 158 static void
 159 killchild(int signo)
 160 {
 161         if (do_cmd_pid > 1) {
 162                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 163                 waitpid(do_cmd_pid, NULL, 0);
 164         }
 165
 166         if (signo)
 167                 _exit(1);
 168         exit(1);
 169 }
 170
 171 static void
 172 suspchild(int signo)
 173 {
 174         int status;
 175
 176         if (do_cmd_pid > 1) {
 177                 kill(do_cmd_pid, signo);
 178                 while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
 179                     errno == EINTR)
 180                         ;
 181                 kill(getpid(), SIGSTOP);
 182         }
 183 }
 184
 185 static int
 186 do_local_cmd(arglist *a)
 187 {
 188         u_int i;
 189         int status;
 190         pid_t pid;
 191
 192         if (a->num == 0)
 193                 fatal("do_local_cmd: no arguments");
 194
 195         if (verbose_mode) {
 196                 fprintf(stderr, "Executing:");
 197                 for (i = 0; i < a->num; i++)
 198                         fmprintf(stderr, " %s", a->list[i]);
 199                 fprintf(stderr, "\n");
 200         }
 201         if ((pid = fork()) == -1)
 202                 fatal("do_local_cmd: fork: %s", strerror(errno));
 203
 204         if (pid == 0) {
 205                 execvp(a->list[0], a->list);
 206                 perror(a->list[0]);
 207                 exit(1);
 208         }
 209
 210         do_cmd_pid = pid;
 211         signal(SIGTERM, killchild);
 212         signal(SIGINT, killchild);
 213         signal(SIGHUP, killchild);
 214
 215         while (waitpid(pid, &status, 0) == -1)
 216                 if (errno != EINTR)
 217                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 218
 219         do_cmd_pid = -1;
 220
 221         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 222                 return (-1);
 223
 224         return (0);
 225 }
 226
 227 /*
 228  * This function executes the given command as the specified user on the
 229  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 230  * assigns the input and output file descriptors on success.
 231  */
 232
 233 int
 234 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 235 {
 236         int pin[2], pout[2], reserved[2];
 237
 238         if (verbose_mode)
 239                 fmprintf(stderr,
 240                     "Executing: program %s host %s, user %s, command %s\n",
 241                     ssh_program, host,
 242                     remuser ? remuser : "(unspecified)", cmd);
 243
 244         /*
 245          * Reserve two descriptors so that the real pipes won't get
 246          * descriptors 0 and 1 because that will screw up dup2 below.
 247          */
 248         if (pipe(reserved) < 0)
 249                 fatal("pipe: %s", strerror(errno));
 250
 251         /* Create a socket pair for communicating with ssh. */
 252         if (pipe(pin) < 0)
 253                 fatal("pipe: %s", strerror(errno));
 254         if (pipe(pout) < 0)
 255                 fatal("pipe: %s", strerror(errno));
 256
 257         /* Free the reserved descriptors. */
 258         close(reserved[0]);
 259         close(reserved[1]);
 260
 261         signal(SIGTSTP, suspchild);
 262         signal(SIGTTIN, suspchild);
 263         signal(SIGTTOU, suspchild);
 264
 265         /* Fork a child to execute the command on the remote host using ssh. */
 266         do_cmd_pid = fork();
 267         if (do_cmd_pid == 0) {
 268                 /* Child. */
 269                 close(pin[1]);
 270                 close(pout[0]);
 271                 dup2(pin[0], 0);
 272                 dup2(pout[1], 1);
 273                 close(pin[0]);
 274                 close(pout[1]);
 275
 276                 replacearg(&args, 0, "%s", ssh_program);
 277                 if (remuser != NULL) {
 278                         addargs(&args, "-l");
 279                         addargs(&args, "%s", remuser);
 280                 }
 281                 addargs(&args, "--");
 282                 addargs(&args, "%s", host);
 283                 addargs(&args, "%s", cmd);
 284
 285                 execvp(ssh_program, args.list);
 286                 perror(ssh_program);
 287                 exit(1);
 288         } else if (do_cmd_pid == -1) {
 289                 fatal("fork: %s", strerror(errno));
 290         }
 291         /* Parent.  Close the other side, and return the local side. */
 292         close(pin[0]);
 293         *fdout = pin[1];
 294         close(pout[1]);
 295         *fdin = pout[0];
 296         signal(SIGTERM, killchild);
 297         signal(SIGINT, killchild);
 298         signal(SIGHUP, killchild);
 299         return 0;
 300 }
 301
 302 /*
 303  * This functions executes a command simlar to do_cmd(), but expects the
 304  * input and output descriptors to be setup by a previous call to do_cmd().
 305  * This way the input and output of two commands can be connected.
 306  */
 307 int
 308 do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
 309 {
 310         pid_t pid;
 311         int status;
 312
 313         if (verbose_mode)
 314                 fmprintf(stderr,
 315                     "Executing: 2nd program %s host %s, user %s, command %s\n",
 316                     ssh_program, host,
 317                     remuser ? remuser : "(unspecified)", cmd);
 318
 319         /* Fork a child to execute the command on the remote host using ssh. */
 320         pid = fork();
 321         if (pid == 0) {
 322                 dup2(fdin, 0);
 323                 dup2(fdout, 1);
 324
 325                 replacearg(&args, 0, "%s", ssh_program);
 326                 if (remuser != NULL) {
 327                         addargs(&args, "-l");
 328                         addargs(&args, "%s", remuser);
 329                 }
 330                 addargs(&args, "--");
 331                 addargs(&args, "%s", host);
 332                 addargs(&args, "%s", cmd);
 333
 334                 execvp(ssh_program, args.list);
 335                 perror(ssh_program);
 336                 exit(1);
 337         } else if (pid == -1) {
 338                 fatal("fork: %s", strerror(errno));
 339         }
 340         while (waitpid(pid, &status, 0) == -1)
 341                 if (errno != EINTR)
 342                         fatal("do_cmd2: waitpid: %s", strerror(errno));
 343         return 0;
 344 }
 345
 346 typedef struct {
 347         size_t cnt;
 348         char *buf;
 349 } BUF;
 350
 351 BUF *allocbuf(BUF *, int, int);
 352 void lostconn(int);
 353 int okname(char *);
 354 void run_err(const char *,...);
 355 void verifydir(char *);
 356
 357 struct passwd *pwd;
 358 uid_t userid;
 359 int errs, remin, remout;
 360 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 361
 362 #define CMDNEEDS        64
 363 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 364
 365 int response(void);
 366 void rsource(char *, struct stat *);
 367 void sink(int, char *[]);
 368 void source(int, char *[]);
 369 void tolocal(int, char *[]);
 370 void toremote(char *, int, char *[]);
 371 void usage(void);
 372
 373 int
 374 main(int argc, char **argv)
 375 {
 376         int ch, fflag, tflag, status, n;
 377         char *targ, **newargv;
 378         const char *errstr;
 379         extern char *optarg;
 380         extern int optind;
 381
 382         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 383         sanitise_stdfd();
 384
 385         msetlocale();
 386
 387         /* Copy argv, because we modify it */
 388         newargv = xcalloc(MAXIMUM(argc + 1, 1), sizeof(*newargv));
 389         for (n = 0; n < argc; n++)
 390                 newargv[n] = xstrdup(argv[n]);
 391         argv = newargv;
 392
 393         __progname = ssh_get_progname(argv[0]);
 394
 395         memset(&args, '\0', sizeof(args));
 396         memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
 397         args.list = remote_remote_args.list = NULL;
 398         addargs(&args, "%s", ssh_program);
 399         addargs(&args, "-x");
 400         addargs(&args, "-oForwardAgent=no");
 401         addargs(&args, "-oPermitLocalCommand=no");
 402         addargs(&args, "-oClearAllForwardings=yes");
 403
 404         fflag = tflag = 0;
 405         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
 406                 switch (ch) {
 407                 /* User-visible flags. */
 408                 case '1':
 409                         fatal("SSH protocol v.1 is no longer supported");
 410                         break;
 411                 case '2':
 412                         /* Ignored */
 413                         break;
 414                 case '4':
 415                 case '6':
 416                 case 'C':
 417                         addargs(&args, "-%c", ch);
 418                         addargs(&remote_remote_args, "-%c", ch);
 419                         break;
 420                 case '3':
 421                         throughlocal = 1;
 422                         break;
 423                 case 'o':
 424                 case 'c':
 425                 case 'i':
 426                 case 'F':
 427                         addargs(&remote_remote_args, "-%c", ch);
 428                         addargs(&remote_remote_args, "%s", optarg);
 429                         addargs(&args, "-%c", ch);
 430                         addargs(&args, "%s", optarg);
 431                         break;
 432                 case 'P':
 433                         addargs(&remote_remote_args, "-p");
 434                         addargs(&remote_remote_args, "%s", optarg);
 435                         addargs(&args, "-p");
 436                         addargs(&args, "%s", optarg);
 437                         break;
 438                 case 'B':
 439                         addargs(&remote_remote_args, "-oBatchmode=yes");
 440                         addargs(&args, "-oBatchmode=yes");
 441                         break;
 442                 case 'l':
 443                         limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
 444                             &errstr);
 445                         if (errstr != NULL)
 446                                 usage();
 447                         limit_kbps *= 1024; /* kbps */
 448                         bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
 449                         break;
 450                 case 'p':
 451                         pflag = 1;
 452                         break;
 453                 case 'r':
 454                         iamrecursive = 1;
 455                         break;
 456                 case 'S':
 457                         ssh_program = xstrdup(optarg);
 458                         break;
 459                 case 'v':
 460                         addargs(&args, "-v");
 461                         addargs(&remote_remote_args, "-v");
 462                         verbose_mode = 1;
 463                         break;
 464                 case 'q':
 465                         addargs(&args, "-q");
 466                         addargs(&remote_remote_args, "-q");
 467                         showprogress = 0;
 468                         break;
 469
 470                 /* Server options. */
 471                 case 'd':
 472                         targetshouldbedirectory = 1;
 473                         break;
 474                 case 'f':       /* "from" */
 475                         iamremote = 1;
 476                         fflag = 1;
 477                         break;
 478                 case 't':       /* "to" */
 479                         iamremote = 1;
 480                         tflag = 1;
 481 #ifdef HAVE_CYGWIN
 482                         setmode(0, O_BINARY);
 483 #endif
 484                         break;
 485                 default:
 486                         usage();
 487                 }
 488         argc -= optind;
 489         argv += optind;
 490
 491         if ((pwd = getpwuid(userid = getuid())) == NULL)
 492                 fatal("unknown user %u", (u_int) userid);
 493
 494         if (!isatty(STDOUT_FILENO))
 495                 showprogress = 0;
 496
 497         if (pflag) {
 498                 /* Cannot pledge: -p allows setuid/setgid files... */
 499         } else {
 500                 if (pledge("stdio rpath wpath cpath fattr tty proc exec",
 501                     NULL) == -1) {
 502                         perror("pledge");
 503                         exit(1);
 504                 }
 505         }
 506
 507         remin = STDIN_FILENO;
 508         remout = STDOUT_FILENO;
 509
 510         if (fflag) {
 511                 /* Follow "protocol", send data. */
 512                 (void) response();
 513                 source(argc, argv);
 514                 exit(errs != 0);
 515         }
 516         if (tflag) {
 517                 /* Receive data. */
 518                 sink(argc, argv);
 519                 exit(errs != 0);
 520         }
 521         if (argc < 2)
 522                 usage();
 523         if (argc > 2)
 524                 targetshouldbedirectory = 1;
 525
 526         remin = remout = -1;
 527         do_cmd_pid = -1;
 528         /* Command to be executed on remote system using "ssh". */
 529         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 530             verbose_mode ? " -v" : "",
 531             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 532             targetshouldbedirectory ? " -d" : "");
 533
 534         (void) signal(SIGPIPE, lostconn);
 535
 536         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 537                 toremote(targ, argc, argv);
 538         else {
 539                 if (targetshouldbedirectory)
 540                         verifydir(argv[argc - 1]);
 541                 tolocal(argc, argv);    /* Dest is local host. */
 542         }
 543         /*
 544          * Finally check the exit status of the ssh process, if one was forked
 545          * and no error has occurred yet
 546          */
 547         if (do_cmd_pid != -1 && errs == 0) {
 548                 if (remin != -1)
 549                     (void) close(remin);
 550                 if (remout != -1)
 551                     (void) close(remout);
 552                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 553                         errs = 1;
 554                 else {
 555                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 556                                 errs = 1;
 557                 }
 558         }
 559         exit(errs != 0);
 560 }
 561
 562 /* Callback from atomicio6 to update progress meter and limit bandwidth */
 563 static int
 564 scpio(void *_cnt, size_t s)
 565 {
 566         off_t *cnt = (off_t *)_cnt;
 567
 568         *cnt += s;
 569         if (limit_kbps > 0)
 570                 bandwidth_limit(&bwlimit, s);
 571         return 0;
 572 }
 573
 574 static int
 575 do_times(int fd, int verb, const struct stat *sb)
 576 {
 577         /* strlen(2^64) == 20; strlen(10^6) == 7 */
 578         char buf[(20 + 7 + 2) * 2 + 2];
 579
 580         (void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
 581             (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
 582             (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
 583         if (verb) {
 584                 fprintf(stderr, "File mtime %lld atime %lld\n",
 585                     (long long)sb->st_mtime, (long long)sb->st_atime);
 586                 fprintf(stderr, "Sending file timestamps: %s", buf);
 587         }
 588         (void) atomicio(vwrite, fd, buf, strlen(buf));
 589         return (response());
 590 }
 591
 592 void
 593 toremote(char *targ, int argc, char **argv)
 594 {
 595         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 596         arglist alist;
 597         int i;
 598         u_int j;
 599
 600         memset(&alist, '\0', sizeof(alist));
 601         alist.list = NULL;
 602
 603         *targ++ = 0;
 604         if (*targ == 0)
 605                 targ = ".";
 606
 607         arg = xstrdup(argv[argc - 1]);
 608         if ((thost = strrchr(arg, '@'))) {
 609                 /* user@host */
 610                 *thost++ = 0;
 611                 tuser = arg;
 612                 if (*tuser == '\0')
 613                         tuser = NULL;
 614         } else {
 615                 thost = arg;
 616                 tuser = NULL;
 617         }
 618
 619         if (tuser != NULL && !okname(tuser)) {
 620                 free(arg);
 621                 return;
 622         }
 623
 624         for (i = 0; i < argc - 1; i++) {
 625                 src = colon(argv[i]);
 626                 if (src && throughlocal) {      /* extended remote to remote */
 627                         *src++ = 0;
 628                         if (*src == 0)
 629                                 src = ".";
 630                         host = strrchr(argv[i], '@');
 631                         if (host) {
 632                                 *host++ = 0;
 633                                 host = cleanhostname(host);
 634                                 suser = argv[i];
 635                                 if (*suser == '\0')
 636                                         suser = pwd->pw_name;
 637                                 else if (!okname(suser))
 638                                         continue;
 639                         } else {
 640                                 host = cleanhostname(argv[i]);
 641                                 suser = NULL;
 642                         }
 643                         xasprintf(&bp, "%s -f %s%s", cmd,
 644                             *src == '-' ? "-- " : "", src);
 645                         if (do_cmd(host, suser, bp, &remin, &remout) < 0)
 646                                 exit(1);
 647                         free(bp);
 648                         host = cleanhostname(thost);
 649                         xasprintf(&bp, "%s -t %s%s", cmd,
 650                             *targ == '-' ? "-- " : "", targ);
 651                         if (do_cmd2(host, tuser, bp, remin, remout) < 0)
 652                                 exit(1);
 653                         free(bp);
 654                         (void) close(remin);
 655                         (void) close(remout);
 656                         remin = remout = -1;
 657                 } else if (src) {       /* standard remote to remote */
 658                         freeargs(&alist);
 659                         addargs(&alist, "%s", ssh_program);
 660                         addargs(&alist, "-x");
 661                         addargs(&alist, "-oClearAllForwardings=yes");
 662                         addargs(&alist, "-n");
 663                         for (j = 0; j < remote_remote_args.num; j++) {
 664                                 addargs(&alist, "%s",
 665                                     remote_remote_args.list[j]);
 666                         }
 667                         *src++ = 0;
 668                         if (*src == 0)
 669                                 src = ".";
 670                         host = strrchr(argv[i], '@');
 671
 672                         if (host) {
 673                                 *host++ = 0;
 674                                 host = cleanhostname(host);
 675                                 suser = argv[i];
 676                                 if (*suser == '\0')
 677                                         suser = pwd->pw_name;
 678                                 else if (!okname(suser))
 679                                         continue;
 680                                 addargs(&alist, "-l");
 681                                 addargs(&alist, "%s", suser);
 682                         } else {
 683                                 host = cleanhostname(argv[i]);
 684                         }
 685                         addargs(&alist, "--");
 686                         addargs(&alist, "%s", host);
 687                         addargs(&alist, "%s", cmd);
 688                         addargs(&alist, "%s", src);
 689                         addargs(&alist, "%s%s%s:%s",
 690                             tuser ? tuser : "", tuser ? "@" : "",
 691                             thost, targ);
 692                         if (do_local_cmd(&alist) != 0)
 693                                 errs = 1;
 694                 } else {        /* local to remote */
 695                         if (remin == -1) {
 696                                 xasprintf(&bp, "%s -t %s%s", cmd,
 697                                     *targ == '-' ? "-- " : "", targ);
 698                                 host = cleanhostname(thost);
 699                                 if (do_cmd(host, tuser, bp, &remin,
 700                                     &remout) < 0)
 701                                         exit(1);
 702                                 if (response() < 0)
 703                                         exit(1);
 704                                 free(bp);
 705                         }
 706                         source(1, argv + i);
 707                 }
 708         }
 709         free(arg);
 710 }
 711
 712 void
 713 tolocal(int argc, char **argv)
 714 {
 715         char *bp, *host, *src, *suser;
 716         arglist alist;
 717         int i;
 718
 719         memset(&alist, '\0', sizeof(alist));
 720         alist.list = NULL;
 721
 722         for (i = 0; i < argc - 1; i++) {
 723                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 724                         freeargs(&alist);
 725                         addargs(&alist, "%s", _PATH_CP);
 726                         if (iamrecursive)
 727                                 addargs(&alist, "-r");
 728                         if (pflag)
 729                                 addargs(&alist, "-p");
 730                         addargs(&alist, "--");
 731                         addargs(&alist, "%s", argv[i]);
 732                         addargs(&alist, "%s", argv[argc-1]);
 733                         if (do_local_cmd(&alist))
 734                                 ++errs;
 735                         continue;
 736                 }
 737                 *src++ = 0;
 738                 if (*src == 0)
 739                         src = ".";
 740                 if ((host = strrchr(argv[i], '@')) == NULL) {
 741                         host = argv[i];
 742                         suser = NULL;
 743                 } else {
 744                         *host++ = 0;
 745                         suser = argv[i];
 746                         if (*suser == '\0')
 747                                 suser = pwd->pw_name;
 748                 }
 749                 host = cleanhostname(host);
 750                 xasprintf(&bp, "%s -f %s%s",
 751                     cmd, *src == '-' ? "-- " : "", src);
 752                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 753                         free(bp);
 754                         ++errs;
 755                         continue;
 756                 }
 757                 free(bp);
 758                 sink(1, argv + argc - 1);
 759                 (void) close(remin);
 760                 remin = remout = -1;
 761         }
 762 }
 763
 764 void
 765 source(int argc, char **argv)
 766 {
 767         struct stat stb;
 768         static BUF buffer;
 769         BUF *bp;
 770         off_t i, statbytes;
 771         size_t amt, nr;
 772         int fd = -1, haderr, indx;
 773         char *last, *name, buf[2048], encname[PATH_MAX];
 774         int len;
 775
 776         for (indx = 0; indx < argc; ++indx) {
 777                 name = argv[indx];
 778                 statbytes = 0;
 779                 len = strlen(name);
 780                 while (len > 1 && name[len-1] == '/')
 781                         name[--len] = '\0';
 782                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 783                         goto syserr;
 784                 if (strchr(name, '\n') != NULL) {
 785                         strnvis(encname, name, sizeof(encname), VIS_NL);
 786                         name = encname;
 787                 }
 788                 if (fstat(fd, &stb) < 0) {
 789 syserr:                 run_err("%s: %s", name, strerror(errno));
 790                         goto next;
 791                 }
 792                 if (stb.st_size < 0) {
 793                         run_err("%s: %s", name, "Negative file size");
 794                         goto next;
 795                 }
 796                 unset_nonblock(fd);
 797                 switch (stb.st_mode & S_IFMT) {
 798                 case S_IFREG:
 799                         break;
 800                 case S_IFDIR:
 801                         if (iamrecursive) {
 802                                 rsource(name, &stb);
 803                                 goto next;
 804                         }
 805                         /* FALLTHROUGH */
 806                 default:
 807                         run_err("%s: not a regular file", name);
 808                         goto next;
 809                 }
 810                 if ((last = strrchr(name, '/')) == NULL)
 811                         last = name;
 812                 else
 813                         ++last;
 814                 curfile = last;
 815                 if (pflag) {
 816                         if (do_times(remout, verbose_mode, &stb) < 0)
 817                                 goto next;
 818                 }
 819 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 820                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 821                     (u_int) (stb.st_mode & FILEMODEMASK),
 822                     (long long)stb.st_size, last);
 823                 if (verbose_mode)
 824                         fmprintf(stderr, "Sending file modes: %s", buf);
 825                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 826                 if (response() < 0)
 827                         goto next;
 828                 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
 829 next:                   if (fd != -1) {
 830                                 (void) close(fd);
 831                                 fd = -1;
 832                         }
 833                         continue;
 834                 }
 835                 if (showprogress)
 836                         start_progress_meter(curfile, stb.st_size, &statbytes);
 837                 set_nonblock(remout);
 838                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 839                         amt = bp->cnt;
 840                         if (i + (off_t)amt > stb.st_size)
 841                                 amt = stb.st_size - i;
 842                         if (!haderr) {
 843                                 if ((nr = atomicio(read, fd,
 844                                     bp->buf, amt)) != amt) {
 845                                         haderr = errno;
 846                                         memset(bp->buf + nr, 0, amt - nr);
 847                                 }
 848                         }
 849                         /* Keep writing after error to retain sync */
 850                         if (haderr) {
 851                                 (void)atomicio(vwrite, remout, bp->buf, amt);
 852                                 memset(bp->buf, 0, amt);
 853                                 continue;
 854                         }
 855                         if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
 856                             &statbytes) != amt)
 857                                 haderr = errno;
 858                 }
 859                 unset_nonblock(remout);
 860
 861                 if (fd != -1) {
 862                         if (close(fd) < 0 && !haderr)
 863                                 haderr = errno;
 864                         fd = -1;
 865                 }
 866                 if (!haderr)
 867                         (void) atomicio(vwrite, remout, "", 1);
 868                 else
 869                         run_err("%s: %s", name, strerror(haderr));
 870                 (void) response();
 871                 if (showprogress)
 872                         stop_progress_meter();
 873         }
 874 }
 875
 876 void
 877 rsource(char *name, struct stat *statp)
 878 {
 879         DIR *dirp;
 880         struct dirent *dp;
 881         char *last, *vect[1], path[PATH_MAX];
 882
 883         if (!(dirp = opendir(name))) {
 884                 run_err("%s: %s", name, strerror(errno));
 885                 return;
 886         }
 887         last = strrchr(name, '/');
 888         if (last == NULL)
 889                 last = name;
 890         else
 891                 last++;
 892         if (pflag) {
 893                 if (do_times(remout, verbose_mode, statp) < 0) {
 894                         closedir(dirp);
 895                         return;
 896                 }
 897         }
 898         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 899             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 900         if (verbose_mode)
 901                 fmprintf(stderr, "Entering directory: %s", path);
 902         (void) atomicio(vwrite, remout, path, strlen(path));
 903         if (response() < 0) {
 904                 closedir(dirp);
 905                 return;
 906         }
 907         while ((dp = readdir(dirp)) != NULL) {
 908                 if (dp->d_ino == 0)
 909                         continue;
 910                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 911                         continue;
 912                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 913                         run_err("%s/%s: name too long", name, dp->d_name);
 914                         continue;
 915                 }
 916                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 917                 vect[0] = path;
 918                 source(1, vect);
 919         }
 920         (void) closedir(dirp);
 921         (void) atomicio(vwrite, remout, "E\n", 2);
 922         (void) response();
 923 }
 924
 925 #define TYPE_OVERFLOW(type, val) \
 926         ((sizeof(type) == 4 && (val) > INT32_MAX) || \
 927          (sizeof(type) == 8 && (val) > INT64_MAX) || \
 928          (sizeof(type) != 4 && sizeof(type) != 8))
 929
 930 void
 931 sink(int argc, char **argv)
 932 {
 933         static BUF buffer;
 934         struct stat stb;
 935         enum {
 936                 YES, NO, DISPLAYED
 937         } wrerr;
 938         BUF *bp;
 939         off_t i;
 940         size_t j, count;
 941         int amt, exists, first, ofd;
 942         mode_t mode, omode, mask;
 943         off_t size, statbytes;
 944         unsigned long long ull;
 945         int setimes, targisdir, wrerrno = 0;
 946         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
 947         struct timeval tv[2];
 948
 949 #define atime   tv[0]
 950 #define mtime   tv[1]
 951 #define SCREWUP(str)    { why = str; goto screwup; }
 952
 953         if (TYPE_OVERFLOW(time_t, 0) || TYPE_OVERFLOW(off_t, 0))
 954                 SCREWUP("Unexpected off_t/time_t size");
 955
 956         setimes = targisdir = 0;
 957         mask = umask(0);
 958         if (!pflag)
 959                 (void) umask(mask);
 960         if (argc != 1) {
 961                 run_err("ambiguous target");
 962                 exit(1);
 963         }
 964         targ = *argv;
 965         if (targetshouldbedirectory)
 966                 verifydir(targ);
 967
 968         (void) atomicio(vwrite, remout, "", 1);
 969         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 970                 targisdir = 1;
 971         for (first = 1;; first = 0) {
 972                 cp = buf;
 973                 if (atomicio(read, remin, cp, 1) != 1)
 974                         return;
 975                 if (*cp++ == '\n')
 976                         SCREWUP("unexpected <newline>");
 977                 do {
 978                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 979                                 SCREWUP("lost connection");
 980                         *cp++ = ch;
 981                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 982                 *cp = 0;
 983                 if (verbose_mode)
 984                         fmprintf(stderr, "Sink: %s", buf);
 985
 986                 if (buf[0] == '\01' || buf[0] == '\02') {
 987                         if (iamremote == 0) {
 988                                 (void) snmprintf(visbuf, sizeof(visbuf),
 989                                     NULL, "%s", buf + 1);
 990                                 (void) atomicio(vwrite, STDERR_FILENO,
 991                                     visbuf, strlen(visbuf));
 992                         }
 993                         if (buf[0] == '\02')
 994                                 exit(1);
 995                         ++errs;
 996                         continue;
 997                 }
 998                 if (buf[0] == 'E') {
 999                         (void) atomicio(vwrite, remout, "", 1);
1000                         return;
1001                 }
1002                 if (ch == '\n')
1003                         *--cp = 0;
1004
1005                 cp = buf;
1006                 if (*cp == 'T') {
1007                         setimes++;
1008                         cp++;
1009                         if (!isdigit((unsigned char)*cp))
1010                                 SCREWUP("mtime.sec not present");
1011                         ull = strtoull(cp, &cp, 10);
1012                         if (!cp || *cp++ != ' ')
1013                                 SCREWUP("mtime.sec not delimited");
1014                         if (TYPE_OVERFLOW(time_t, ull))
1015                                 setimes = 0;    /* out of range */
1016                         mtime.tv_sec = ull;
1017                         mtime.tv_usec = strtol(cp, &cp, 10);
1018                         if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
1019                             mtime.tv_usec > 999999)
1020                                 SCREWUP("mtime.usec not delimited");
1021                         if (!isdigit((unsigned char)*cp))
1022                                 SCREWUP("atime.sec not present");
1023                         ull = strtoull(cp, &cp, 10);
1024                         if (!cp || *cp++ != ' ')
1025                                 SCREWUP("atime.sec not delimited");
1026                         if (TYPE_OVERFLOW(time_t, ull))
1027                                 setimes = 0;    /* out of range */
1028                         atime.tv_sec = ull;
1029                         atime.tv_usec = strtol(cp, &cp, 10);
1030                         if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
1031                             atime.tv_usec > 999999)
1032                                 SCREWUP("atime.usec not delimited");
1033                         (void) atomicio(vwrite, remout, "", 1);
1034                         continue;
1035                 }
1036                 if (*cp != 'C' && *cp != 'D') {
1037                         /*
1038                          * Check for the case "rcp remote:foo\* local:bar".
1039                          * In this case, the line "No match." can be returned
1040                          * by the shell before the rcp command on the remote is
1041                          * executed so the ^Aerror_message convention isn't
1042                          * followed.
1043                          */
1044                         if (first) {
1045                                 run_err("%s", cp);
1046                                 exit(1);
1047                         }
1048                         SCREWUP("expected control record");
1049                 }
1050                 mode = 0;
1051                 for (++cp; cp < buf + 5; cp++) {
1052                         if (*cp < '0' || *cp > '7')
1053                                 SCREWUP("bad mode");
1054                         mode = (mode << 3) | (*cp - '0');
1055                 }
1056                 if (*cp++ != ' ')
1057                         SCREWUP("mode not delimited");
1058
1059                 if (!isdigit((unsigned char)*cp))
1060                         SCREWUP("size not present");
1061                 ull = strtoull(cp, &cp, 10);
1062                 if (!cp || *cp++ != ' ')
1063                         SCREWUP("size not delimited");
1064                 if (TYPE_OVERFLOW(off_t, ull))
1065                         SCREWUP("size out of range");
1066                 size = (off_t)ull;
1067
1068                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
1069                         run_err("error: unexpected filename: %s", cp);
1070                         exit(1);
1071                 }
1072                 if (targisdir) {
1073                         static char *namebuf;
1074                         static size_t cursize;
1075                         size_t need;
1076
1077                         need = strlen(targ) + strlen(cp) + 250;
1078                         if (need > cursize) {
1079                                 free(namebuf);
1080                                 namebuf = xmalloc(need);
1081                                 cursize = need;
1082                         }
1083                         (void) snprintf(namebuf, need, "%s%s%s", targ,
1084                             strcmp(targ, "/") ? "/" : "", cp);
1085                         np = namebuf;
1086                 } else
1087                         np = targ;
1088                 curfile = cp;
1089                 exists = stat(np, &stb) == 0;
1090                 if (buf[0] == 'D') {
1091                         int mod_flag = pflag;
1092                         if (!iamrecursive)
1093                                 SCREWUP("received directory without -r");
1094                         if (exists) {
1095                                 if (!S_ISDIR(stb.st_mode)) {
1096                                         errno = ENOTDIR;
1097                                         goto bad;
1098                                 }
1099                                 if (pflag)
1100                                         (void) chmod(np, mode);
1101                         } else {
1102                                 /* Handle copying from a read-only
1103                                    directory */
1104                                 mod_flag = 1;
1105                                 if (mkdir(np, mode | S_IRWXU) < 0)
1106                                         goto bad;
1107                         }
1108                         vect[0] = xstrdup(np);
1109                         sink(1, vect);
1110                         if (setimes) {
1111                                 setimes = 0;
1112                                 if (utimes(vect[0], tv) < 0)
1113                                         run_err("%s: set times: %s",
1114                                             vect[0], strerror(errno));
1115                         }
1116                         if (mod_flag)
1117                                 (void) chmod(vect[0], mode);
1118                         free(vect[0]);
1119                         continue;
1120                 }
1121                 omode = mode;
1122                 mode |= S_IWUSR;
1123                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1124 bad:                    run_err("%s: %s", np, strerror(errno));
1125                         continue;
1126                 }
1127                 (void) atomicio(vwrite, remout, "", 1);
1128                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1129                         (void) close(ofd);
1130                         continue;
1131                 }
1132                 cp = bp->buf;
1133                 wrerr = NO;
1134
1135                 statbytes = 0;
1136                 if (showprogress)
1137                         start_progress_meter(curfile, size, &statbytes);
1138                 set_nonblock(remin);
1139                 for (count = i = 0; i < size; i += bp->cnt) {
1140                         amt = bp->cnt;
1141                         if (i + amt > size)
1142                                 amt = size - i;
1143                         count += amt;
1144                         do {
1145                                 j = atomicio6(read, remin, cp, amt,
1146                                     scpio, &statbytes);
1147                                 if (j == 0) {
1148                                         run_err("%s", j != EPIPE ?
1149                                             strerror(errno) :
1150                                             "dropped connection");
1151                                         exit(1);
1152                                 }
1153                                 amt -= j;
1154                                 cp += j;
1155                         } while (amt > 0);
1156
1157                         if (count == bp->cnt) {
1158                                 /* Keep reading so we stay sync'd up. */
1159                                 if (wrerr == NO) {
1160                                         if (atomicio(vwrite, ofd, bp->buf,
1161                                             count) != count) {
1162                                                 wrerr = YES;
1163                                                 wrerrno = errno;
1164                                         }
1165                                 }
1166                                 count = 0;
1167                                 cp = bp->buf;
1168                         }
1169                 }
1170                 unset_nonblock(remin);
1171                 if (count != 0 && wrerr == NO &&
1172                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1173                         wrerr = YES;
1174                         wrerrno = errno;
1175                 }
1176                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1177                     ftruncate(ofd, size) != 0) {
1178                         run_err("%s: truncate: %s", np, strerror(errno));
1179                         wrerr = DISPLAYED;
1180                 }
1181                 if (pflag) {
1182                         if (exists || omode != mode)
1183 #ifdef HAVE_FCHMOD
1184                                 if (fchmod(ofd, omode)) {
1185 #else /* HAVE_FCHMOD */
1186                                 if (chmod(np, omode)) {
1187 #endif /* HAVE_FCHMOD */
1188                                         run_err("%s: set mode: %s",
1189                                             np, strerror(errno));
1190                                         wrerr = DISPLAYED;
1191                                 }
1192                 } else {
1193                         if (!exists && omode != mode)
1194 #ifdef HAVE_FCHMOD
1195                                 if (fchmod(ofd, omode & ~mask)) {
1196 #else /* HAVE_FCHMOD */
1197                                 if (chmod(np, omode & ~mask)) {
1198 #endif /* HAVE_FCHMOD */
1199                                         run_err("%s: set mode: %s",
1200                                             np, strerror(errno));
1201                                         wrerr = DISPLAYED;
1202                                 }
1203                 }
1204                 if (close(ofd) == -1) {
1205                         wrerr = YES;
1206                         wrerrno = errno;
1207                 }
1208                 (void) response();
1209                 if (showprogress)
1210                         stop_progress_meter();
1211                 if (setimes && wrerr == NO) {
1212                         setimes = 0;
1213                         if (utimes(np, tv) < 0) {
1214                                 run_err("%s: set times: %s",
1215                                     np, strerror(errno));
1216                                 wrerr = DISPLAYED;
1217                         }
1218                 }
1219                 switch (wrerr) {
1220                 case YES:
1221                         run_err("%s: %s", np, strerror(wrerrno));
1222                         break;
1223                 case NO:
1224                         (void) atomicio(vwrite, remout, "", 1);
1225                         break;
1226                 case DISPLAYED:
1227                         break;
1228                 }
1229         }
1230 screwup:
1231         run_err("protocol error: %s", why);
1232         exit(1);
1233 }
1234
1235 int
1236 response(void)
1237 {
1238         char ch, *cp, resp, rbuf[2048], visbuf[2048];
1239
1240         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1241                 lostconn(0);
1242
1243         cp = rbuf;
1244         switch (resp) {
1245         case 0:         /* ok */
1246                 return (0);
1247         default:
1248                 *cp++ = resp;
1249                 /* FALLTHROUGH */
1250         case 1:         /* error, followed by error msg */
1251         case 2:         /* fatal error, "" */
1252                 do {
1253                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1254                                 lostconn(0);
1255                         *cp++ = ch;
1256                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1257
1258                 if (!iamremote) {
1259                         cp[-1] = '\0';
1260                         (void) snmprintf(visbuf, sizeof(visbuf),
1261                             NULL, "%s\n", rbuf);
1262                         (void) atomicio(vwrite, STDERR_FILENO,
1263                             visbuf, strlen(visbuf));
1264                 }
1265                 ++errs;
1266                 if (resp == 1)
1267                         return (-1);
1268                 exit(1);
1269         }
1270         /* NOTREACHED */
1271 }
1272
1273 void
1274 usage(void)
1275 {
1276         (void) fprintf(stderr,
1277             "usage: scp [-346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1278             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1279             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1280         exit(1);
1281 }
1282
1283 void
1284 run_err(const char *fmt,...)
1285 {
1286         static FILE *fp;
1287         va_list ap;
1288
1289         ++errs;
1290         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1291                 (void) fprintf(fp, "%c", 0x01);
1292                 (void) fprintf(fp, "scp: ");
1293                 va_start(ap, fmt);
1294                 (void) vfprintf(fp, fmt, ap);
1295                 va_end(ap);
1296                 (void) fprintf(fp, "\n");
1297                 (void) fflush(fp);
1298         }
1299
1300         if (!iamremote) {
1301                 va_start(ap, fmt);
1302                 vfmprintf(stderr, fmt, ap);
1303                 va_end(ap);
1304                 fprintf(stderr, "\n");
1305         }
1306 }
1307
1308 void
1309 verifydir(char *cp)
1310 {
1311         struct stat stb;
1312
1313         if (!stat(cp, &stb)) {
1314                 if (S_ISDIR(stb.st_mode))
1315                         return;
1316                 errno = ENOTDIR;
1317         }
1318         run_err("%s: %s", cp, strerror(errno));
1319         killchild(0);
1320 }
1321
1322 int
1323 okname(char *cp0)
1324 {
1325         int c;
1326         char *cp;
1327
1328         cp = cp0;
1329         do {
1330                 c = (int)*cp;
1331                 if (c & 0200)
1332                         goto bad;
1333                 if (!isalpha(c) && !isdigit((unsigned char)c)) {
1334                         switch (c) {
1335                         case '\'':
1336                         case '"':
1337                         case '`':
1338                         case ' ':
1339                         case '#':
1340                                 goto bad;
1341                         default:
1342                                 break;
1343                         }
1344                 }
1345         } while (*++cp);
1346         return (1);
1347
1348 bad:    fmprintf(stderr, "%s: invalid user name\n", cp0);
1349         return (0);
1350 }
1351
1352 BUF *
1353 allocbuf(BUF *bp, int fd, int blksize)
1354 {
1355         size_t size;
1356 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1357         struct stat stb;
1358
1359         if (fstat(fd, &stb) < 0) {
1360                 run_err("fstat: %s", strerror(errno));
1361                 return (0);
1362         }
1363         size = ROUNDUP(stb.st_blksize, blksize);
1364         if (size == 0)
1365                 size = blksize;
1366 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1367         size = blksize;
1368 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1369         if (bp->cnt >= size)
1370                 return (bp);
1371         bp->buf = xrecallocarray(bp->buf, bp->cnt, size, 1);
1372         bp->cnt = size;
1373         return (bp);
1374 }
1375
1376 void
1377 lostconn(int signo)
1378 {
1379         if (!iamremote)
1380                 (void)write(STDERR_FILENO, "lost connection\n", 16);
1381         if (signo)
1382                 _exit(1);
1383         else
1384                 exit(1);
1385 }