scp.c

   1 /*
   2  * scp - secure remote copy.  This is basically patched BSD rcp which
   3  * uses ssh to do the data transfer (instead of using rcmd).
   4  *
   5  * NOTE: This version should NOT be suid root.  (This uses ssh to
   6  * do the transfer and ssh has the necessary privileges.)
   7  *
   8  * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
   9  *
  10  * As far as I am concerned, the code I have written for this software
  11  * can be used freely for any purpose.  Any derived versions of this
  12  * software must be clearly marked as such, and if the derived work is
  13  * incompatible with the protocol description in the RFC file, it must be
  14  * called by a name other than "ssh" or "Secure Shell".
  15  */
  16 /*
  17  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  18  * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  * 1. Redistributions of source code must retain the above copyright
  24  *    notice, this list of conditions and the following disclaimer.
  25  * 2. Redistributions in binary form must reproduce the above copyright
  26  *    notice, this list of conditions and the following disclaimer in the
  27  *    documentation and/or other materials provided with the distribution.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  30  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  31  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  32  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  33  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  34  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  38  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  */
  40
  41 /*
  42  * Parts from:
  43  *
  44  * Copyright (c) 1983, 1990, 1992, 1993, 1995
  45  *      The Regents of the University of California.  All rights reserved.
  46  *
  47  * Redistribution and use in source and binary forms, with or without
  48  * modification, are permitted provided that the following conditions
  49  * are met:
  50  * 1. Redistributions of source code must retain the above copyright
  51  *    notice, this list of conditions and the following disclaimer.
  52  * 2. Redistributions in binary form must reproduce the above copyright
  53  *    notice, this list of conditions and the following disclaimer in the
  54  *    documentation and/or other materials provided with the distribution.
  55  * 3. Neither the name of the University nor the names of its contributors
  56  *    may be used to endorse or promote products derived from this software
  57  *    without specific prior written permission.
  58  *
  59  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  69  * SUCH DAMAGE.
  70  *
  71  */
  72
  73 #include "includes.h"
  74 RCSID("$OpenBSD: scp.c,v 1.128 2005/12/06 22:38:27 reyk Exp $");
  75
  76 #include "xmalloc.h"
  77 #include "atomicio.h"
  78 #include "pathnames.h"
  79 #include "log.h"
  80 #include "misc.h"
  81 #include "progressmeter.h"
  82
  83 extern char *__progname;
  84
  85 void bwlimit(int);
  86
  87 /* Struct for addargs */
  88 arglist args;
  89
  90 /* Bandwidth limit */
  91 off_t limit_rate = 0;
  92
  93 /* Name of current file being transferred. */
  94 char *curfile;
  95
  96 /* This is set to non-zero to enable verbose mode. */
  97 int verbose_mode = 0;
  98
  99 /* This is set to zero if the progressmeter is not desired. */
 100 int showprogress = 1;
 101
 102 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 103 char *ssh_program = _PATH_SSH_PROGRAM;
 104
 105 /* This is used to store the pid of ssh_program */
 106 pid_t do_cmd_pid = -1;
 107
 108 static void
 109 killchild(int signo)
 110 {
 111         if (do_cmd_pid > 1) {
 112                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 113                 waitpid(do_cmd_pid, NULL, 0);
 114         }
 115
 116         if (signo)
 117                 _exit(1);
 118         exit(1);
 119 }
 120
 121 /*
 122  * This function executes the given command as the specified user on the
 123  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 124  * assigns the input and output file descriptors on success.
 125  */
 126
 127 int
 128 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
 129 {
 130         int pin[2], pout[2], reserved[2];
 131
 132         if (verbose_mode)
 133                 fprintf(stderr,
 134                     "Executing: program %s host %s, user %s, command %s\n",
 135                     ssh_program, host,
 136                     remuser ? remuser : "(unspecified)", cmd);
 137
 138         /*
 139          * Reserve two descriptors so that the real pipes won't get
 140          * descriptors 0 and 1 because that will screw up dup2 below.
 141          */
 142         pipe(reserved);
 143
 144         /* Create a socket pair for communicating with ssh. */
 145         if (pipe(pin) < 0)
 146                 fatal("pipe: %s", strerror(errno));
 147         if (pipe(pout) < 0)
 148                 fatal("pipe: %s", strerror(errno));
 149
 150         /* Free the reserved descriptors. */
 151         close(reserved[0]);
 152         close(reserved[1]);
 153
 154         /* Fork a child to execute the command on the remote host using ssh. */
 155         do_cmd_pid = fork();
 156         if (do_cmd_pid == 0) {
 157                 /* Child. */
 158                 close(pin[1]);
 159                 close(pout[0]);
 160                 dup2(pin[0], 0);
 161                 dup2(pout[1], 1);
 162                 close(pin[0]);
 163                 close(pout[1]);
 164
 165                 args.list[0] = ssh_program;
 166                 if (remuser != NULL)
 167                         addargs(&args, "-l%s", remuser);
 168                 addargs(&args, "%s", host);
 169                 addargs(&args, "%s", cmd);
 170
 171                 execvp(ssh_program, args.list);
 172                 perror(ssh_program);
 173                 exit(1);
 174         } else if (do_cmd_pid == -1) {
 175                 fatal("fork: %s", strerror(errno));
 176         }
 177         /* Parent.  Close the other side, and return the local side. */
 178         close(pin[0]);
 179         *fdout = pin[1];
 180         close(pout[1]);
 181         *fdin = pout[0];
 182         signal(SIGTERM, killchild);
 183         signal(SIGINT, killchild);
 184         signal(SIGHUP, killchild);
 185         return 0;
 186 }
 187
 188 typedef struct {
 189         size_t cnt;
 190         char *buf;
 191 } BUF;
 192
 193 BUF *allocbuf(BUF *, int, int);
 194 void lostconn(int);
 195 void nospace(void);
 196 int okname(char *);
 197 void run_err(const char *,...);
 198 void verifydir(char *);
 199
 200 struct passwd *pwd;
 201 uid_t userid;
 202 int errs, remin, remout;
 203 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 204
 205 #define CMDNEEDS        64
 206 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 207
 208 int response(void);
 209 void rsource(char *, struct stat *);
 210 void sink(int, char *[]);
 211 void source(int, char *[]);
 212 void tolocal(int, char *[]);
 213 void toremote(char *, int, char *[]);
 214 void usage(void);
 215
 216 int
 217 main(int argc, char **argv)
 218 {
 219         int ch, fflag, tflag, status;
 220         double speed;
 221         char *targ, *endp;
 222         extern char *optarg;
 223         extern int optind;
 224
 225         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 226         sanitise_stdfd();
 227
 228         __progname = ssh_get_progname(argv[0]);
 229
 230         args.list = NULL;
 231         addargs(&args, "ssh");          /* overwritten with ssh_program */
 232         addargs(&args, "-x");
 233         addargs(&args, "-oForwardAgent no");
 234         addargs(&args, "-oPermitLocalCommand no");
 235         addargs(&args, "-oClearAllForwardings yes");
 236
 237         fflag = tflag = 0;
 238         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 239                 switch (ch) {
 240                 /* User-visible flags. */
 241                 case '1':
 242                 case '2':
 243                 case '4':
 244                 case '6':
 245                 case 'C':
 246                         addargs(&args, "-%c", ch);
 247                         break;
 248                 case 'o':
 249                 case 'c':
 250                 case 'i':
 251                 case 'F':
 252                         addargs(&args, "-%c%s", ch, optarg);
 253                         break;
 254                 case 'P':
 255                         addargs(&args, "-p%s", optarg);
 256                         break;
 257                 case 'B':
 258                         addargs(&args, "-oBatchmode yes");
 259                         break;
 260                 case 'l':
 261                         speed = strtod(optarg, &endp);
 262                         if (speed <= 0 || *endp != '\0')
 263                                 usage();
 264                         limit_rate = speed * 1024;
 265                         break;
 266                 case 'p':
 267                         pflag = 1;
 268                         break;
 269                 case 'r':
 270                         iamrecursive = 1;
 271                         break;
 272                 case 'S':
 273                         ssh_program = xstrdup(optarg);
 274                         break;
 275                 case 'v':
 276                         addargs(&args, "-v");
 277                         verbose_mode = 1;
 278                         break;
 279                 case 'q':
 280                         addargs(&args, "-q");
 281                         showprogress = 0;
 282                         break;
 283
 284                 /* Server options. */
 285                 case 'd':
 286                         targetshouldbedirectory = 1;
 287                         break;
 288                 case 'f':       /* "from" */
 289                         iamremote = 1;
 290                         fflag = 1;
 291                         break;
 292                 case 't':       /* "to" */
 293                         iamremote = 1;
 294                         tflag = 1;
 295 #ifdef HAVE_CYGWIN
 296                         setmode(0, O_BINARY);
 297 #endif
 298                         break;
 299                 default:
 300                         usage();
 301                 }
 302         argc -= optind;
 303         argv += optind;
 304
 305         if ((pwd = getpwuid(userid = getuid())) == NULL)
 306                 fatal("unknown user %u", (u_int) userid);
 307
 308         if (!isatty(STDERR_FILENO))
 309                 showprogress = 0;
 310
 311         remin = STDIN_FILENO;
 312         remout = STDOUT_FILENO;
 313
 314         if (fflag) {
 315                 /* Follow "protocol", send data. */
 316                 (void) response();
 317                 source(argc, argv);
 318                 exit(errs != 0);
 319         }
 320         if (tflag) {
 321                 /* Receive data. */
 322                 sink(argc, argv);
 323                 exit(errs != 0);
 324         }
 325         if (argc < 2)
 326                 usage();
 327         if (argc > 2)
 328                 targetshouldbedirectory = 1;
 329
 330         remin = remout = -1;
 331         do_cmd_pid = -1;
 332         /* Command to be executed on remote system using "ssh". */
 333         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 334             verbose_mode ? " -v" : "",
 335             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 336             targetshouldbedirectory ? " -d" : "");
 337
 338         (void) signal(SIGPIPE, lostconn);
 339
 340         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 341                 toremote(targ, argc, argv);
 342         else {
 343                 tolocal(argc, argv);    /* Dest is local host. */
 344                 if (targetshouldbedirectory)
 345                         verifydir(argv[argc - 1]);
 346         }
 347         /*
 348          * Finally check the exit status of the ssh process, if one was forked
 349          * and no error has occured yet
 350          */
 351         if (do_cmd_pid != -1 && errs == 0) {
 352                 if (remin != -1)
 353                     (void) close(remin);
 354                 if (remout != -1)
 355                     (void) close(remout);
 356                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 357                         errs = 1;
 358                 else {
 359                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 360                                 errs = 1;
 361                 }
 362         }
 363         exit(errs != 0);
 364 }
 365
 366 void
 367 toremote(char *targ, int argc, char **argv)
 368 {
 369         int i, len;
 370         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 371
 372         *targ++ = 0;
 373         if (*targ == 0)
 374                 targ = ".";
 375
 376         arg = xstrdup(argv[argc - 1]);
 377         if ((thost = strrchr(arg, '@'))) {
 378                 /* user@host */
 379                 *thost++ = 0;
 380                 tuser = arg;
 381                 if (*tuser == '\0')
 382                         tuser = NULL;
 383         } else {
 384                 thost = arg;
 385                 tuser = NULL;
 386         }
 387
 388         for (i = 0; i < argc - 1; i++) {
 389                 src = colon(argv[i]);
 390                 if (src) {      /* remote to remote */
 391                         static char *ssh_options =
 392                             "-x -o'ClearAllForwardings yes'";
 393                         *src++ = 0;
 394                         if (*src == 0)
 395                                 src = ".";
 396                         host = strrchr(argv[i], '@');
 397                         len = strlen(ssh_program) + strlen(argv[i]) +
 398                             strlen(src) + (tuser ? strlen(tuser) : 0) +
 399                             strlen(thost) + strlen(targ) +
 400                             strlen(ssh_options) + CMDNEEDS + 20;
 401                         bp = xmalloc(len);
 402                         if (host) {
 403                                 *host++ = 0;
 404                                 host = cleanhostname(host);
 405                                 suser = argv[i];
 406                                 if (*suser == '\0')
 407                                         suser = pwd->pw_name;
 408                                 else if (!okname(suser)) {
 409                                         xfree(bp);
 410                                         continue;
 411                                 }
 412                                 if (tuser && !okname(tuser)) {
 413                                         xfree(bp);
 414                                         continue;
 415                                 }
 416                                 snprintf(bp, len,
 417                                     "%s%s %s -n "
 418                                     "-l %s %s %s %s '%s%s%s:%s'",
 419                                     ssh_program, verbose_mode ? " -v" : "",
 420                                     ssh_options, suser, host, cmd, src,
 421                                     tuser ? tuser : "", tuser ? "@" : "",
 422                                     thost, targ);
 423                         } else {
 424                                 host = cleanhostname(argv[i]);
 425                                 snprintf(bp, len,
 426                                     "exec %s%s %s -n %s "
 427                                     "%s %s '%s%s%s:%s'",
 428                                     ssh_program, verbose_mode ? " -v" : "",
 429                                     ssh_options, host, cmd, src,
 430                                     tuser ? tuser : "", tuser ? "@" : "",
 431                                     thost, targ);
 432                         }
 433                         if (verbose_mode)
 434                                 fprintf(stderr, "Executing: %s\n", bp);
 435                         if (system(bp) != 0)
 436                                 errs = 1;
 437                         (void) xfree(bp);
 438                 } else {        /* local to remote */
 439                         if (remin == -1) {
 440                                 len = strlen(targ) + CMDNEEDS + 20;
 441                                 bp = xmalloc(len);
 442                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
 443                                 host = cleanhostname(thost);
 444                                 if (do_cmd(host, tuser, bp, &remin,
 445                                     &remout, argc) < 0)
 446                                         exit(1);
 447                                 if (response() < 0)
 448                                         exit(1);
 449                                 (void) xfree(bp);
 450                         }
 451                         source(1, argv + i);
 452                 }
 453         }
 454 }
 455
 456 void
 457 tolocal(int argc, char **argv)
 458 {
 459         int i, len;
 460         char *bp, *host, *src, *suser;
 461
 462         for (i = 0; i < argc - 1; i++) {
 463                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 464                         len = strlen(_PATH_CP) + strlen(argv[i]) +
 465                             strlen(argv[argc - 1]) + 20;
 466                         bp = xmalloc(len);
 467                         (void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
 468                             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 469                             argv[i], argv[argc - 1]);
 470                         if (verbose_mode)
 471                                 fprintf(stderr, "Executing: %s\n", bp);
 472                         if (system(bp))
 473                                 ++errs;
 474                         (void) xfree(bp);
 475                         continue;
 476                 }
 477                 *src++ = 0;
 478                 if (*src == 0)
 479                         src = ".";
 480                 if ((host = strrchr(argv[i], '@')) == NULL) {
 481                         host = argv[i];
 482                         suser = NULL;
 483                 } else {
 484                         *host++ = 0;
 485                         suser = argv[i];
 486                         if (*suser == '\0')
 487                                 suser = pwd->pw_name;
 488                 }
 489                 host = cleanhostname(host);
 490                 len = strlen(src) + CMDNEEDS + 20;
 491                 bp = xmalloc(len);
 492                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
 493                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
 494                         (void) xfree(bp);
 495                         ++errs;
 496                         continue;
 497                 }
 498                 xfree(bp);
 499                 sink(1, argv + argc - 1);
 500                 (void) close(remin);
 501                 remin = remout = -1;
 502         }
 503 }
 504
 505 void
 506 source(int argc, char **argv)
 507 {
 508         struct stat stb;
 509         static BUF buffer;
 510         BUF *bp;
 511         off_t i, amt, statbytes;
 512         size_t result;
 513         int fd = -1, haderr, indx;
 514         char *last, *name, buf[2048];
 515         int len;
 516
 517         for (indx = 0; indx < argc; ++indx) {
 518                 name = argv[indx];
 519                 statbytes = 0;
 520                 len = strlen(name);
 521                 while (len > 1 && name[len-1] == '/')
 522                         name[--len] = '\0';
 523                 if (strchr(name, '\n') != NULL) {
 524                         run_err("%s: skipping, filename contains a newline",
 525                             name);
 526                         goto next;
 527                 }
 528                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 529                         goto syserr;
 530                 if (fstat(fd, &stb) < 0) {
 531 syserr:                 run_err("%s: %s", name, strerror(errno));
 532                         goto next;
 533                 }
 534                 switch (stb.st_mode & S_IFMT) {
 535                 case S_IFREG:
 536                         break;
 537                 case S_IFDIR:
 538                         if (iamrecursive) {
 539                                 rsource(name, &stb);
 540                                 goto next;
 541                         }
 542                         /* FALLTHROUGH */
 543                 default:
 544                         run_err("%s: not a regular file", name);
 545                         goto next;
 546                 }
 547                 if ((last = strrchr(name, '/')) == NULL)
 548                         last = name;
 549                 else
 550                         ++last;
 551                 curfile = last;
 552                 if (pflag) {
 553                         /*
 554                          * Make it compatible with possible future
 555                          * versions expecting microseconds.
 556                          */
 557                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 558                             (u_long) stb.st_mtime,
 559                             (u_long) stb.st_atime);
 560                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 561                         if (response() < 0)
 562                                 goto next;
 563                 }
 564 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 565                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 566                     (u_int) (stb.st_mode & FILEMODEMASK),
 567                     (long long)stb.st_size, last);
 568                 if (verbose_mode) {
 569                         fprintf(stderr, "Sending file modes: %s", buf);
 570                 }
 571                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 572                 if (response() < 0)
 573                         goto next;
 574                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 575 next:                   if (fd != -1) {
 576                                 (void) close(fd);
 577                                 fd = -1;
 578                         }
 579                         continue;
 580                 }
 581                 if (showprogress)
 582                         start_progress_meter(curfile, stb.st_size, &statbytes);
 583                 /* Keep writing after an error so that we stay sync'd up. */
 584                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 585                         amt = bp->cnt;
 586                         if (i + amt > stb.st_size)
 587                                 amt = stb.st_size - i;
 588                         if (!haderr) {
 589                                 result = atomicio(read, fd, bp->buf, amt);
 590                                 if (result != amt)
 591                                         haderr = errno;
 592                         }
 593                         if (haderr)
 594                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 595                         else {
 596                                 result = atomicio(vwrite, remout, bp->buf, amt);
 597                                 if (result != amt)
 598                                         haderr = errno;
 599                                 statbytes += result;
 600                         }
 601                         if (limit_rate)
 602                                 bwlimit(amt);
 603                 }
 604                 if (showprogress)
 605                         stop_progress_meter();
 606
 607                 if (fd != -1) {
 608                         if (close(fd) < 0 && !haderr)
 609                                 haderr = errno;
 610                         fd = -1;
 611                 }
 612                 if (!haderr)
 613                         (void) atomicio(vwrite, remout, "", 1);
 614                 else
 615                         run_err("%s: %s", name, strerror(haderr));
 616                 (void) response();
 617         }
 618 }
 619
 620 void
 621 rsource(char *name, struct stat *statp)
 622 {
 623         DIR *dirp;
 624         struct dirent *dp;
 625         char *last, *vect[1], path[1100];
 626
 627         if (!(dirp = opendir(name))) {
 628                 run_err("%s: %s", name, strerror(errno));
 629                 return;
 630         }
 631         last = strrchr(name, '/');
 632         if (last == 0)
 633                 last = name;
 634         else
 635                 last++;
 636         if (pflag) {
 637                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 638                     (u_long) statp->st_mtime,
 639                     (u_long) statp->st_atime);
 640                 (void) atomicio(vwrite, remout, path, strlen(path));
 641                 if (response() < 0) {
 642                         closedir(dirp);
 643                         return;
 644                 }
 645         }
 646         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 647             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 648         if (verbose_mode)
 649                 fprintf(stderr, "Entering directory: %s", path);
 650         (void) atomicio(vwrite, remout, path, strlen(path));
 651         if (response() < 0) {
 652                 closedir(dirp);
 653                 return;
 654         }
 655         while ((dp = readdir(dirp)) != NULL) {
 656                 if (dp->d_ino == 0)
 657                         continue;
 658                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 659                         continue;
 660                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 661                         run_err("%s/%s: name too long", name, dp->d_name);
 662                         continue;
 663                 }
 664                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 665                 vect[0] = path;
 666                 source(1, vect);
 667         }
 668         (void) closedir(dirp);
 669         (void) atomicio(vwrite, remout, "E\n", 2);
 670         (void) response();
 671 }
 672
 673 void
 674 bwlimit(int amount)
 675 {
 676         static struct timeval bwstart, bwend;
 677         static int lamt, thresh = 16384;
 678         u_int64_t waitlen;
 679         struct timespec ts, rm;
 680
 681         if (!timerisset(&bwstart)) {
 682                 gettimeofday(&bwstart, NULL);
 683                 return;
 684         }
 685
 686         lamt += amount;
 687         if (lamt < thresh)
 688                 return;
 689
 690         gettimeofday(&bwend, NULL);
 691         timersub(&bwend, &bwstart, &bwend);
 692         if (!timerisset(&bwend))
 693                 return;
 694
 695         lamt *= 8;
 696         waitlen = (double)1000000L * lamt / limit_rate;
 697
 698         bwstart.tv_sec = waitlen / 1000000L;
 699         bwstart.tv_usec = waitlen % 1000000L;
 700
 701         if (timercmp(&bwstart, &bwend, >)) {
 702                 timersub(&bwstart, &bwend, &bwend);
 703
 704                 /* Adjust the wait time */
 705                 if (bwend.tv_sec) {
 706                         thresh /= 2;
 707                         if (thresh < 2048)
 708                                 thresh = 2048;
 709                 } else if (bwend.tv_usec < 100) {
 710                         thresh *= 2;
 711                         if (thresh > 32768)
 712                                 thresh = 32768;
 713                 }
 714
 715                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 716                 while (nanosleep(&ts, &rm) == -1) {
 717                         if (errno != EINTR)
 718                                 break;
 719                         ts = rm;
 720                 }
 721         }
 722
 723         lamt = 0;
 724         gettimeofday(&bwstart, NULL);
 725 }
 726
 727 void
 728 sink(int argc, char **argv)
 729 {
 730         static BUF buffer;
 731         struct stat stb;
 732         enum {
 733                 YES, NO, DISPLAYED
 734         } wrerr;
 735         BUF *bp;
 736         off_t i;
 737         size_t j, count;
 738         int amt, exists, first, mask, mode, ofd, omode;
 739         off_t size, statbytes;
 740         int setimes, targisdir, wrerrno = 0;
 741         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 742         struct timeval tv[2];
 743
 744 #define atime   tv[0]
 745 #define mtime   tv[1]
 746 #define SCREWUP(str)    { why = str; goto screwup; }
 747
 748         setimes = targisdir = 0;
 749         mask = umask(0);
 750         if (!pflag)
 751                 (void) umask(mask);
 752         if (argc != 1) {
 753                 run_err("ambiguous target");
 754                 exit(1);
 755         }
 756         targ = *argv;
 757         if (targetshouldbedirectory)
 758                 verifydir(targ);
 759
 760         (void) atomicio(vwrite, remout, "", 1);
 761         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 762                 targisdir = 1;
 763         for (first = 1;; first = 0) {
 764                 cp = buf;
 765                 if (atomicio(read, remin, cp, 1) != 1)
 766                         return;
 767                 if (*cp++ == '\n')
 768                         SCREWUP("unexpected <newline>");
 769                 do {
 770                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 771                                 SCREWUP("lost connection");
 772                         *cp++ = ch;
 773                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 774                 *cp = 0;
 775                 if (verbose_mode)
 776                         fprintf(stderr, "Sink: %s", buf);
 777
 778                 if (buf[0] == '\01' || buf[0] == '\02') {
 779                         if (iamremote == 0)
 780                                 (void) atomicio(vwrite, STDERR_FILENO,
 781                                     buf + 1, strlen(buf + 1));
 782                         if (buf[0] == '\02')
 783                                 exit(1);
 784                         ++errs;
 785                         continue;
 786                 }
 787                 if (buf[0] == 'E') {
 788                         (void) atomicio(vwrite, remout, "", 1);
 789                         return;
 790                 }
 791                 if (ch == '\n')
 792                         *--cp = 0;
 793
 794                 cp = buf;
 795                 if (*cp == 'T') {
 796                         setimes++;
 797                         cp++;
 798                         mtime.tv_sec = strtol(cp, &cp, 10);
 799                         if (!cp || *cp++ != ' ')
 800                                 SCREWUP("mtime.sec not delimited");
 801                         mtime.tv_usec = strtol(cp, &cp, 10);
 802                         if (!cp || *cp++ != ' ')
 803                                 SCREWUP("mtime.usec not delimited");
 804                         atime.tv_sec = strtol(cp, &cp, 10);
 805                         if (!cp || *cp++ != ' ')
 806                                 SCREWUP("atime.sec not delimited");
 807                         atime.tv_usec = strtol(cp, &cp, 10);
 808                         if (!cp || *cp++ != '\0')
 809                                 SCREWUP("atime.usec not delimited");
 810                         (void) atomicio(vwrite, remout, "", 1);
 811                         continue;
 812                 }
 813                 if (*cp != 'C' && *cp != 'D') {
 814                         /*
 815                          * Check for the case "rcp remote:foo\* local:bar".
 816                          * In this case, the line "No match." can be returned
 817                          * by the shell before the rcp command on the remote is
 818                          * executed so the ^Aerror_message convention isn't
 819                          * followed.
 820                          */
 821                         if (first) {
 822                                 run_err("%s", cp);
 823                                 exit(1);
 824                         }
 825                         SCREWUP("expected control record");
 826                 }
 827                 mode = 0;
 828                 for (++cp; cp < buf + 5; cp++) {
 829                         if (*cp < '0' || *cp > '7')
 830                                 SCREWUP("bad mode");
 831                         mode = (mode << 3) | (*cp - '0');
 832                 }
 833                 if (*cp++ != ' ')
 834                         SCREWUP("mode not delimited");
 835
 836                 for (size = 0; isdigit(*cp);)
 837                         size = size * 10 + (*cp++ - '0');
 838                 if (*cp++ != ' ')
 839                         SCREWUP("size not delimited");
 840                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 841                         run_err("error: unexpected filename: %s", cp);
 842                         exit(1);
 843                 }
 844                 if (targisdir) {
 845                         static char *namebuf;
 846                         static size_t cursize;
 847                         size_t need;
 848
 849                         need = strlen(targ) + strlen(cp) + 250;
 850                         if (need > cursize) {
 851                                 if (namebuf)
 852                                         xfree(namebuf);
 853                                 namebuf = xmalloc(need);
 854                                 cursize = need;
 855                         }
 856                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 857                             strcmp(targ, "/") ? "/" : "", cp);
 858                         np = namebuf;
 859                 } else
 860                         np = targ;
 861                 curfile = cp;
 862                 exists = stat(np, &stb) == 0;
 863                 if (buf[0] == 'D') {
 864                         int mod_flag = pflag;
 865                         if (!iamrecursive)
 866                                 SCREWUP("received directory without -r");
 867                         if (exists) {
 868                                 if (!S_ISDIR(stb.st_mode)) {
 869                                         errno = ENOTDIR;
 870                                         goto bad;
 871                                 }
 872                                 if (pflag)
 873                                         (void) chmod(np, mode);
 874                         } else {
 875                                 /* Handle copying from a read-only
 876                                    directory */
 877                                 mod_flag = 1;
 878                                 if (mkdir(np, mode | S_IRWXU) < 0)
 879                                         goto bad;
 880                         }
 881                         vect[0] = xstrdup(np);
 882                         sink(1, vect);
 883                         if (setimes) {
 884                                 setimes = 0;
 885                                 if (utimes(vect[0], tv) < 0)
 886                                         run_err("%s: set times: %s",
 887                                             vect[0], strerror(errno));
 888                         }
 889                         if (mod_flag)
 890                                 (void) chmod(vect[0], mode);
 891                         if (vect[0])
 892                                 xfree(vect[0]);
 893                         continue;
 894                 }
 895                 omode = mode;
 896                 mode |= S_IWRITE;
 897                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 898 bad:                    run_err("%s: %s", np, strerror(errno));
 899                         continue;
 900                 }
 901                 (void) atomicio(vwrite, remout, "", 1);
 902                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 903                         (void) close(ofd);
 904                         continue;
 905                 }
 906                 cp = bp->buf;
 907                 wrerr = NO;
 908
 909                 statbytes = 0;
 910                 if (showprogress)
 911                         start_progress_meter(curfile, size, &statbytes);
 912                 for (count = i = 0; i < size; i += 4096) {
 913                         amt = 4096;
 914                         if (i + amt > size)
 915                                 amt = size - i;
 916                         count += amt;
 917                         do {
 918                                 j = atomicio(read, remin, cp, amt);
 919                                 if (j == 0) {
 920                                         run_err("%s", j ? strerror(errno) :
 921                                             "dropped connection");
 922                                         exit(1);
 923                                 }
 924                                 amt -= j;
 925                                 cp += j;
 926                                 statbytes += j;
 927                         } while (amt > 0);
 928
 929                         if (limit_rate)
 930                                 bwlimit(4096);
 931
 932                         if (count == bp->cnt) {
 933                                 /* Keep reading so we stay sync'd up. */
 934                                 if (wrerr == NO) {
 935                                         if (atomicio(vwrite, ofd, bp->buf,
 936                                             count) != count) {
 937                                                 wrerr = YES;
 938                                                 wrerrno = errno;
 939                                         }
 940                                 }
 941                                 count = 0;
 942                                 cp = bp->buf;
 943                         }
 944                 }
 945                 if (showprogress)
 946                         stop_progress_meter();
 947                 if (count != 0 && wrerr == NO &&
 948                     atomicio(vwrite, ofd, bp->buf, count) != count) {
 949                         wrerr = YES;
 950                         wrerrno = errno;
 951                 }
 952                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
 953                         run_err("%s: truncate: %s", np, strerror(errno));
 954                         wrerr = DISPLAYED;
 955                 }
 956                 if (pflag) {
 957                         if (exists || omode != mode)
 958 #ifdef HAVE_FCHMOD
 959                                 if (fchmod(ofd, omode)) {
 960 #else /* HAVE_FCHMOD */
 961                                 if (chmod(np, omode)) {
 962 #endif /* HAVE_FCHMOD */
 963                                         run_err("%s: set mode: %s",
 964                                             np, strerror(errno));
 965                                         wrerr = DISPLAYED;
 966                                 }
 967                 } else {
 968                         if (!exists && omode != mode)
 969 #ifdef HAVE_FCHMOD
 970                                 if (fchmod(ofd, omode & ~mask)) {
 971 #else /* HAVE_FCHMOD */
 972                                 if (chmod(np, omode & ~mask)) {
 973 #endif /* HAVE_FCHMOD */
 974                                         run_err("%s: set mode: %s",
 975                                             np, strerror(errno));
 976                                         wrerr = DISPLAYED;
 977                                 }
 978                 }
 979                 if (close(ofd) == -1) {
 980                         wrerr = YES;
 981                         wrerrno = errno;
 982                 }
 983                 (void) response();
 984                 if (setimes && wrerr == NO) {
 985                         setimes = 0;
 986                         if (utimes(np, tv) < 0) {
 987                                 run_err("%s: set times: %s",
 988                                     np, strerror(errno));
 989                                 wrerr = DISPLAYED;
 990                         }
 991                 }
 992                 switch (wrerr) {
 993                 case YES:
 994                         run_err("%s: %s", np, strerror(wrerrno));
 995                         break;
 996                 case NO:
 997                         (void) atomicio(vwrite, remout, "", 1);
 998                         break;
 999                 case DISPLAYED:
1000                         break;
1001                 }
1002         }
1003 screwup:
1004         run_err("protocol error: %s", why);
1005         exit(1);
1006 }
1007
1008 int
1009 response(void)
1010 {
1011         char ch, *cp, resp, rbuf[2048];
1012
1013         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1014                 lostconn(0);
1015
1016         cp = rbuf;
1017         switch (resp) {
1018         case 0:         /* ok */
1019                 return (0);
1020         default:
1021                 *cp++ = resp;
1022                 /* FALLTHROUGH */
1023         case 1:         /* error, followed by error msg */
1024         case 2:         /* fatal error, "" */
1025                 do {
1026                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1027                                 lostconn(0);
1028                         *cp++ = ch;
1029                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1030
1031                 if (!iamremote)
1032                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1033                 ++errs;
1034                 if (resp == 1)
1035                         return (-1);
1036                 exit(1);
1037         }
1038         /* NOTREACHED */
1039 }
1040
1041 void
1042 usage(void)
1043 {
1044         (void) fprintf(stderr,
1045             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1046             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1047             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1048         exit(1);
1049 }
1050
1051 void
1052 run_err(const char *fmt,...)
1053 {
1054         static FILE *fp;
1055         va_list ap;
1056
1057         ++errs;
1058         if (fp == NULL && !(fp = fdopen(remout, "w")))
1059                 return;
1060         (void) fprintf(fp, "%c", 0x01);
1061         (void) fprintf(fp, "scp: ");
1062         va_start(ap, fmt);
1063         (void) vfprintf(fp, fmt, ap);
1064         va_end(ap);
1065         (void) fprintf(fp, "\n");
1066         (void) fflush(fp);
1067
1068         if (!iamremote) {
1069                 va_start(ap, fmt);
1070                 vfprintf(stderr, fmt, ap);
1071                 va_end(ap);
1072                 fprintf(stderr, "\n");
1073         }
1074 }
1075
1076 void
1077 verifydir(char *cp)
1078 {
1079         struct stat stb;
1080
1081         if (!stat(cp, &stb)) {
1082                 if (S_ISDIR(stb.st_mode))
1083                         return;
1084                 errno = ENOTDIR;
1085         }
1086         run_err("%s: %s", cp, strerror(errno));
1087         killchild(0);
1088 }
1089
1090 int
1091 okname(char *cp0)
1092 {
1093         int c;
1094         char *cp;
1095
1096         cp = cp0;
1097         do {
1098                 c = (int)*cp;
1099                 if (c & 0200)
1100                         goto bad;
1101                 if (!isalpha(c) && !isdigit(c)) {
1102                         switch (c) {
1103                         case '\'':
1104                         case '"':
1105                         case '`':
1106                         case ' ':
1107                         case '#':
1108                                 goto bad;
1109                         default:
1110                                 break;
1111                         }
1112                 }
1113         } while (*++cp);
1114         return (1);
1115
1116 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1117         return (0);
1118 }
1119
1120 BUF *
1121 allocbuf(BUF *bp, int fd, int blksize)
1122 {
1123         size_t size;
1124 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1125         struct stat stb;
1126
1127         if (fstat(fd, &stb) < 0) {
1128                 run_err("fstat: %s", strerror(errno));
1129                 return (0);
1130         }
1131         size = roundup(stb.st_blksize, blksize);
1132         if (size == 0)
1133                 size = blksize;
1134 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1135         size = blksize;
1136 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1137         if (bp->cnt >= size)
1138                 return (bp);
1139         if (bp->buf == NULL)
1140                 bp->buf = xmalloc(size);
1141         else
1142                 bp->buf = xrealloc(bp->buf, size);
1143         memset(bp->buf, 0, size);
1144         bp->cnt = size;
1145         return (bp);
1146 }
1147
1148 void
1149 lostconn(int signo)
1150 {
1151         if (!iamremote)
1152                 write(STDERR_FILENO, "lost connection\n", 16);
1153         if (signo)
1154                 _exit(1);
1155         else
1156                 exit(1);
1157 }