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 1.127 2005/11/12 18:38:15 deraadt 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, "-oClearAllForwardings yes");
 235
 236         fflag = tflag = 0;
 237         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 238                 switch (ch) {
 239                 /* User-visible flags. */
 240                 case '1':
 241                 case '2':
 242                 case '4':
 243                 case '6':
 244                 case 'C':
 245                         addargs(&args, "-%c", ch);
 246                         break;
 247                 case 'o':
 248                 case 'c':
 249                 case 'i':
 250                 case 'F':
 251                         addargs(&args, "-%c%s", ch, optarg);
 252                         break;
 253                 case 'P':
 254                         addargs(&args, "-p%s", optarg);
 255                         break;
 256                 case 'B':
 257                         addargs(&args, "-oBatchmode yes");
 258                         break;
 259                 case 'l':
 260                         speed = strtod(optarg, &endp);
 261                         if (speed <= 0 || *endp != '\0')
 262                                 usage();
 263                         limit_rate = speed * 1024;
 264                         break;
 265                 case 'p':
 266                         pflag = 1;
 267                         break;
 268                 case 'r':
 269                         iamrecursive = 1;
 270                         break;
 271                 case 'S':
 272                         ssh_program = xstrdup(optarg);
 273                         break;
 274                 case 'v':
 275                         addargs(&args, "-v");
 276                         verbose_mode = 1;
 277                         break;
 278                 case 'q':
 279                         addargs(&args, "-q");
 280                         showprogress = 0;
 281                         break;
 282
 283                 /* Server options. */
 284                 case 'd':
 285                         targetshouldbedirectory = 1;
 286                         break;
 287                 case 'f':       /* "from" */
 288                         iamremote = 1;
 289                         fflag = 1;
 290                         break;
 291                 case 't':       /* "to" */
 292                         iamremote = 1;
 293                         tflag = 1;
 294 #ifdef HAVE_CYGWIN
 295                         setmode(0, O_BINARY);
 296 #endif
 297                         break;
 298                 default:
 299                         usage();
 300                 }
 301         argc -= optind;
 302         argv += optind;
 303
 304         if ((pwd = getpwuid(userid = getuid())) == NULL)
 305                 fatal("unknown user %u", (u_int) userid);
 306
 307         if (!isatty(STDERR_FILENO))
 308                 showprogress = 0;
 309
 310         remin = STDIN_FILENO;
 311         remout = STDOUT_FILENO;
 312
 313         if (fflag) {
 314                 /* Follow "protocol", send data. */
 315                 (void) response();
 316                 source(argc, argv);
 317                 exit(errs != 0);
 318         }
 319         if (tflag) {
 320                 /* Receive data. */
 321                 sink(argc, argv);
 322                 exit(errs != 0);
 323         }
 324         if (argc < 2)
 325                 usage();
 326         if (argc > 2)
 327                 targetshouldbedirectory = 1;
 328
 329         remin = remout = -1;
 330         do_cmd_pid = -1;
 331         /* Command to be executed on remote system using "ssh". */
 332         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 333             verbose_mode ? " -v" : "",
 334             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 335             targetshouldbedirectory ? " -d" : "");
 336
 337         (void) signal(SIGPIPE, lostconn);
 338
 339         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 340                 toremote(targ, argc, argv);
 341         else {
 342                 tolocal(argc, argv);    /* Dest is local host. */
 343                 if (targetshouldbedirectory)
 344                         verifydir(argv[argc - 1]);
 345         }
 346         /*
 347          * Finally check the exit status of the ssh process, if one was forked
 348          * and no error has occured yet
 349          */
 350         if (do_cmd_pid != -1 && errs == 0) {
 351                 if (remin != -1)
 352                     (void) close(remin);
 353                 if (remout != -1)
 354                     (void) close(remout);
 355                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 356                         errs = 1;
 357                 else {
 358                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 359                                 errs = 1;
 360                 }
 361         }
 362         exit(errs != 0);
 363 }
 364
 365 void
 366 toremote(char *targ, int argc, char **argv)
 367 {
 368         int i, len;
 369         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 370
 371         *targ++ = 0;
 372         if (*targ == 0)
 373                 targ = ".";
 374
 375         arg = xstrdup(argv[argc - 1]);
 376         if ((thost = strrchr(arg, '@'))) {
 377                 /* user@host */
 378                 *thost++ = 0;
 379                 tuser = arg;
 380                 if (*tuser == '\0')
 381                         tuser = NULL;
 382         } else {
 383                 thost = arg;
 384                 tuser = NULL;
 385         }
 386
 387         for (i = 0; i < argc - 1; i++) {
 388                 src = colon(argv[i]);
 389                 if (src) {      /* remote to remote */
 390                         static char *ssh_options =
 391                             "-x -o'ClearAllForwardings yes'";
 392                         *src++ = 0;
 393                         if (*src == 0)
 394                                 src = ".";
 395                         host = strrchr(argv[i], '@');
 396                         len = strlen(ssh_program) + strlen(argv[i]) +
 397                             strlen(src) + (tuser ? strlen(tuser) : 0) +
 398                             strlen(thost) + strlen(targ) +
 399                             strlen(ssh_options) + CMDNEEDS + 20;
 400                         bp = xmalloc(len);
 401                         if (host) {
 402                                 *host++ = 0;
 403                                 host = cleanhostname(host);
 404                                 suser = argv[i];
 405                                 if (*suser == '\0')
 406                                         suser = pwd->pw_name;
 407                                 else if (!okname(suser)) {
 408                                         xfree(bp);
 409                                         continue;
 410                                 }
 411                                 if (tuser && !okname(tuser)) {
 412                                         xfree(bp);
 413                                         continue;
 414                                 }
 415                                 snprintf(bp, len,
 416                                     "%s%s %s -n "
 417                                     "-l %s %s %s %s '%s%s%s:%s'",
 418                                     ssh_program, verbose_mode ? " -v" : "",
 419                                     ssh_options, suser, host, cmd, src,
 420                                     tuser ? tuser : "", tuser ? "@" : "",
 421                                     thost, targ);
 422                         } else {
 423                                 host = cleanhostname(argv[i]);
 424                                 snprintf(bp, len,
 425                                     "exec %s%s %s -n %s "
 426                                     "%s %s '%s%s%s:%s'",
 427                                     ssh_program, verbose_mode ? " -v" : "",
 428                                     ssh_options, host, cmd, src,
 429                                     tuser ? tuser : "", tuser ? "@" : "",
 430                                     thost, targ);
 431                         }
 432                         if (verbose_mode)
 433                                 fprintf(stderr, "Executing: %s\n", bp);
 434                         if (system(bp) != 0)
 435                                 errs = 1;
 436                         (void) xfree(bp);
 437                 } else {        /* local to remote */
 438                         if (remin == -1) {
 439                                 len = strlen(targ) + CMDNEEDS + 20;
 440                                 bp = xmalloc(len);
 441                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
 442                                 host = cleanhostname(thost);
 443                                 if (do_cmd(host, tuser, bp, &remin,
 444                                     &remout, argc) < 0)
 445                                         exit(1);
 446                                 if (response() < 0)
 447                                         exit(1);
 448                                 (void) xfree(bp);
 449                         }
 450                         source(1, argv + i);
 451                 }
 452         }
 453 }
 454
 455 void
 456 tolocal(int argc, char **argv)
 457 {
 458         int i, len;
 459         char *bp, *host, *src, *suser;
 460
 461         for (i = 0; i < argc - 1; i++) {
 462                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 463                         len = strlen(_PATH_CP) + strlen(argv[i]) +
 464                             strlen(argv[argc - 1]) + 20;
 465                         bp = xmalloc(len);
 466                         (void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
 467                             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 468                             argv[i], argv[argc - 1]);
 469                         if (verbose_mode)
 470                                 fprintf(stderr, "Executing: %s\n", bp);
 471                         if (system(bp))
 472                                 ++errs;
 473                         (void) xfree(bp);
 474                         continue;
 475                 }
 476                 *src++ = 0;
 477                 if (*src == 0)
 478                         src = ".";
 479                 if ((host = strrchr(argv[i], '@')) == NULL) {
 480                         host = argv[i];
 481                         suser = NULL;
 482                 } else {
 483                         *host++ = 0;
 484                         suser = argv[i];
 485                         if (*suser == '\0')
 486                                 suser = pwd->pw_name;
 487                 }
 488                 host = cleanhostname(host);
 489                 len = strlen(src) + CMDNEEDS + 20;
 490                 bp = xmalloc(len);
 491                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
 492                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
 493                         (void) xfree(bp);
 494                         ++errs;
 495                         continue;
 496                 }
 497                 xfree(bp);
 498                 sink(1, argv + argc - 1);
 499                 (void) close(remin);
 500                 remin = remout = -1;
 501         }
 502 }
 503
 504 void
 505 source(int argc, char **argv)
 506 {
 507         struct stat stb;
 508         static BUF buffer;
 509         BUF *bp;
 510         off_t i, amt, statbytes;
 511         size_t result;
 512         int fd = -1, haderr, indx;
 513         char *last, *name, buf[2048];
 514         int len;
 515
 516         for (indx = 0; indx < argc; ++indx) {
 517                 name = argv[indx];
 518                 statbytes = 0;
 519                 len = strlen(name);
 520                 while (len > 1 && name[len-1] == '/')
 521                         name[--len] = '\0';
 522                 if (strchr(name, '\n') != NULL) {
 523                         run_err("%s: skipping, filename contains a newline",
 524                             name);
 525                         goto next;
 526                 }
 527                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 528                         goto syserr;
 529                 if (fstat(fd, &stb) < 0) {
 530 syserr:                 run_err("%s: %s", name, strerror(errno));
 531                         goto next;
 532                 }
 533                 switch (stb.st_mode & S_IFMT) {
 534                 case S_IFREG:
 535                         break;
 536                 case S_IFDIR:
 537                         if (iamrecursive) {
 538                                 rsource(name, &stb);
 539                                 goto next;
 540                         }
 541                         /* FALLTHROUGH */
 542                 default:
 543                         run_err("%s: not a regular file", name);
 544                         goto next;
 545                 }
 546                 if ((last = strrchr(name, '/')) == NULL)
 547                         last = name;
 548                 else
 549                         ++last;
 550                 curfile = last;
 551                 if (pflag) {
 552                         /*
 553                          * Make it compatible with possible future
 554                          * versions expecting microseconds.
 555                          */
 556                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 557                             (u_long) stb.st_mtime,
 558                             (u_long) stb.st_atime);
 559                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 560                         if (response() < 0)
 561                                 goto next;
 562                 }
 563 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 564                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 565                     (u_int) (stb.st_mode & FILEMODEMASK),
 566                     (int64_t)stb.st_size, last);
 567                 if (verbose_mode) {
 568                         fprintf(stderr, "Sending file modes: %s", buf);
 569                 }
 570                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 571                 if (response() < 0)
 572                         goto next;
 573                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 574 next:                   if (fd != -1) {
 575                                 (void) close(fd);
 576                                 fd = -1;
 577                         }
 578                         continue;
 579                 }
 580                 if (showprogress)
 581                         start_progress_meter(curfile, stb.st_size, &statbytes);
 582                 /* Keep writing after an error so that we stay sync'd up. */
 583                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 584                         amt = bp->cnt;
 585                         if (i + amt > stb.st_size)
 586                                 amt = stb.st_size - i;
 587                         if (!haderr) {
 588                                 result = atomicio(read, fd, bp->buf, amt);
 589                                 if (result != amt)
 590                                         haderr = errno;
 591                         }
 592                         if (haderr)
 593                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 594                         else {
 595                                 result = atomicio(vwrite, remout, bp->buf, amt);
 596                                 if (result != amt)
 597                                         haderr = errno;
 598                                 statbytes += result;
 599                         }
 600                         if (limit_rate)
 601                                 bwlimit(amt);
 602                 }
 603                 if (showprogress)
 604                         stop_progress_meter();
 605
 606                 if (fd != -1) {
 607                         if (close(fd) < 0 && !haderr)
 608                                 haderr = errno;
 609                         fd = -1;
 610                 }
 611                 if (!haderr)
 612                         (void) atomicio(vwrite, remout, "", 1);
 613                 else
 614                         run_err("%s: %s", name, strerror(haderr));
 615                 (void) response();
 616         }
 617 }
 618
 619 void
 620 rsource(char *name, struct stat *statp)
 621 {
 622         DIR *dirp;
 623         struct dirent *dp;
 624         char *last, *vect[1], path[1100];
 625
 626         if (!(dirp = opendir(name))) {
 627                 run_err("%s: %s", name, strerror(errno));
 628                 return;
 629         }
 630         last = strrchr(name, '/');
 631         if (last == 0)
 632                 last = name;
 633         else
 634                 last++;
 635         if (pflag) {
 636                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 637                     (u_long) statp->st_mtime,
 638                     (u_long) statp->st_atime);
 639                 (void) atomicio(vwrite, remout, path, strlen(path));
 640                 if (response() < 0) {
 641                         closedir(dirp);
 642                         return;
 643                 }
 644         }
 645         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 646             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 647         if (verbose_mode)
 648                 fprintf(stderr, "Entering directory: %s", path);
 649         (void) atomicio(vwrite, remout, path, strlen(path));
 650         if (response() < 0) {
 651                 closedir(dirp);
 652                 return;
 653         }
 654         while ((dp = readdir(dirp)) != NULL) {
 655                 if (dp->d_ino == 0)
 656                         continue;
 657                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 658                         continue;
 659                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 660                         run_err("%s/%s: name too long", name, dp->d_name);
 661                         continue;
 662                 }
 663                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 664                 vect[0] = path;
 665                 source(1, vect);
 666         }
 667         (void) closedir(dirp);
 668         (void) atomicio(vwrite, remout, "E\n", 2);
 669         (void) response();
 670 }
 671
 672 void
 673 bwlimit(int amount)
 674 {
 675         static struct timeval bwstart, bwend;
 676         static int lamt, thresh = 16384;
 677         u_int64_t waitlen;
 678         struct timespec ts, rm;
 679
 680         if (!timerisset(&bwstart)) {
 681                 gettimeofday(&bwstart, NULL);
 682                 return;
 683         }
 684
 685         lamt += amount;
 686         if (lamt < thresh)
 687                 return;
 688
 689         gettimeofday(&bwend, NULL);
 690         timersub(&bwend, &bwstart, &bwend);
 691         if (!timerisset(&bwend))
 692                 return;
 693
 694         lamt *= 8;
 695         waitlen = (double)1000000L * lamt / limit_rate;
 696
 697         bwstart.tv_sec = waitlen / 1000000L;
 698         bwstart.tv_usec = waitlen % 1000000L;
 699
 700         if (timercmp(&bwstart, &bwend, >)) {
 701                 timersub(&bwstart, &bwend, &bwend);
 702
 703                 /* Adjust the wait time */
 704                 if (bwend.tv_sec) {
 705                         thresh /= 2;
 706                         if (thresh < 2048)
 707                                 thresh = 2048;
 708                 } else if (bwend.tv_usec < 100) {
 709                         thresh *= 2;
 710                         if (thresh > 32768)
 711                                 thresh = 32768;
 712                 }
 713
 714                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 715                 while (nanosleep(&ts, &rm) == -1) {
 716                         if (errno != EINTR)
 717                                 break;
 718                         ts = rm;
 719                 }
 720         }
 721
 722         lamt = 0;
 723         gettimeofday(&bwstart, NULL);
 724 }
 725
 726 void
 727 sink(int argc, char **argv)
 728 {
 729         static BUF buffer;
 730         struct stat stb;
 731         enum {
 732                 YES, NO, DISPLAYED
 733         } wrerr;
 734         BUF *bp;
 735         off_t i;
 736         size_t j, count;
 737         int amt, exists, first, mask, mode, ofd, omode;
 738         off_t size, statbytes;
 739         int setimes, targisdir, wrerrno = 0;
 740         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 741         struct timeval tv[2];
 742
 743 #define atime   tv[0]
 744 #define mtime   tv[1]
 745 #define SCREWUP(str)    { why = str; goto screwup; }
 746
 747         setimes = targisdir = 0;
 748         mask = umask(0);
 749         if (!pflag)
 750                 (void) umask(mask);
 751         if (argc != 1) {
 752                 run_err("ambiguous target");
 753                 exit(1);
 754         }
 755         targ = *argv;
 756         if (targetshouldbedirectory)
 757                 verifydir(targ);
 758
 759         (void) atomicio(vwrite, remout, "", 1);
 760         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 761                 targisdir = 1;
 762         for (first = 1;; first = 0) {
 763                 cp = buf;
 764                 if (atomicio(read, remin, cp, 1) != 1)
 765                         return;
 766                 if (*cp++ == '\n')
 767                         SCREWUP("unexpected <newline>");
 768                 do {
 769                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 770                                 SCREWUP("lost connection");
 771                         *cp++ = ch;
 772                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 773                 *cp = 0;
 774                 if (verbose_mode)
 775                         fprintf(stderr, "Sink: %s", buf);
 776
 777                 if (buf[0] == '\01' || buf[0] == '\02') {
 778                         if (iamremote == 0)
 779                                 (void) atomicio(vwrite, STDERR_FILENO,
 780                                     buf + 1, strlen(buf + 1));
 781                         if (buf[0] == '\02')
 782                                 exit(1);
 783                         ++errs;
 784                         continue;
 785                 }
 786                 if (buf[0] == 'E') {
 787                         (void) atomicio(vwrite, remout, "", 1);
 788                         return;
 789                 }
 790                 if (ch == '\n')
 791                         *--cp = 0;
 792
 793                 cp = buf;
 794                 if (*cp == 'T') {
 795                         setimes++;
 796                         cp++;
 797                         mtime.tv_sec = strtol(cp, &cp, 10);
 798                         if (!cp || *cp++ != ' ')
 799                                 SCREWUP("mtime.sec not delimited");
 800                         mtime.tv_usec = strtol(cp, &cp, 10);
 801                         if (!cp || *cp++ != ' ')
 802                                 SCREWUP("mtime.usec not delimited");
 803                         atime.tv_sec = strtol(cp, &cp, 10);
 804                         if (!cp || *cp++ != ' ')
 805                                 SCREWUP("atime.sec not delimited");
 806                         atime.tv_usec = strtol(cp, &cp, 10);
 807                         if (!cp || *cp++ != '\0')
 808                                 SCREWUP("atime.usec not delimited");
 809                         (void) atomicio(vwrite, remout, "", 1);
 810                         continue;
 811                 }
 812                 if (*cp != 'C' && *cp != 'D') {
 813                         /*
 814                          * Check for the case "rcp remote:foo\* local:bar".
 815                          * In this case, the line "No match." can be returned
 816                          * by the shell before the rcp command on the remote is
 817                          * executed so the ^Aerror_message convention isn't
 818                          * followed.
 819                          */
 820                         if (first) {
 821                                 run_err("%s", cp);
 822                                 exit(1);
 823                         }
 824                         SCREWUP("expected control record");
 825                 }
 826                 mode = 0;
 827                 for (++cp; cp < buf + 5; cp++) {
 828                         if (*cp < '0' || *cp > '7')
 829                                 SCREWUP("bad mode");
 830                         mode = (mode << 3) | (*cp - '0');
 831                 }
 832                 if (*cp++ != ' ')
 833                         SCREWUP("mode not delimited");
 834
 835                 for (size = 0; isdigit(*cp);)
 836                         size = size * 10 + (*cp++ - '0');
 837                 if (*cp++ != ' ')
 838                         SCREWUP("size not delimited");
 839                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 840                         run_err("error: unexpected filename: %s", cp);
 841                         exit(1);
 842                 }
 843                 if (targisdir) {
 844                         static char *namebuf;
 845                         static size_t cursize;
 846                         size_t need;
 847
 848                         need = strlen(targ) + strlen(cp) + 250;
 849                         if (need > cursize) {
 850                                 if (namebuf)
 851                                         xfree(namebuf);
 852                                 namebuf = xmalloc(need);
 853                                 cursize = need;
 854                         }
 855                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 856                             strcmp(targ, "/") ? "/" : "", cp);
 857                         np = namebuf;
 858                 } else
 859                         np = targ;
 860                 curfile = cp;
 861                 exists = stat(np, &stb) == 0;
 862                 if (buf[0] == 'D') {
 863                         int mod_flag = pflag;
 864                         if (!iamrecursive)
 865                                 SCREWUP("received directory without -r");
 866                         if (exists) {
 867                                 if (!S_ISDIR(stb.st_mode)) {
 868                                         errno = ENOTDIR;
 869                                         goto bad;
 870                                 }
 871                                 if (pflag)
 872                                         (void) chmod(np, mode);
 873                         } else {
 874                                 /* Handle copying from a read-only
 875                                    directory */
 876                                 mod_flag = 1;
 877                                 if (mkdir(np, mode | S_IRWXU) < 0)
 878                                         goto bad;
 879                         }
 880                         vect[0] = xstrdup(np);
 881                         sink(1, vect);
 882                         if (setimes) {
 883                                 setimes = 0;
 884                                 if (utimes(vect[0], tv) < 0)
 885                                         run_err("%s: set times: %s",
 886                                             vect[0], strerror(errno));
 887                         }
 888                         if (mod_flag)
 889                                 (void) chmod(vect[0], mode);
 890                         if (vect[0])
 891                                 xfree(vect[0]);
 892                         continue;
 893                 }
 894                 omode = mode;
 895                 mode |= S_IWRITE;
 896                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 897 bad:                    run_err("%s: %s", np, strerror(errno));
 898                         continue;
 899                 }
 900                 (void) atomicio(vwrite, remout, "", 1);
 901                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 902                         (void) close(ofd);
 903                         continue;
 904                 }
 905                 cp = bp->buf;
 906                 wrerr = NO;
 907
 908                 statbytes = 0;
 909                 if (showprogress)
 910                         start_progress_meter(curfile, size, &statbytes);
 911                 for (count = i = 0; i < size; i += 4096) {
 912                         amt = 4096;
 913                         if (i + amt > size)
 914                                 amt = size - i;
 915                         count += amt;
 916                         do {
 917                                 j = atomicio(read, remin, cp, amt);
 918                                 if (j == 0) {
 919                                         run_err("%s", j ? strerror(errno) :
 920                                             "dropped connection");
 921                                         exit(1);
 922                                 }
 923                                 amt -= j;
 924                                 cp += j;
 925                                 statbytes += j;
 926                         } while (amt > 0);
 927
 928                         if (limit_rate)
 929                                 bwlimit(4096);
 930
 931                         if (count == bp->cnt) {
 932                                 /* Keep reading so we stay sync'd up. */
 933                                 if (wrerr == NO) {
 934                                         if (atomicio(vwrite, ofd, bp->buf,
 935                                             count) != count) {
 936                                                 wrerr = YES;
 937                                                 wrerrno = errno;
 938                                         }
 939                                 }
 940                                 count = 0;
 941                                 cp = bp->buf;
 942                         }
 943                 }
 944                 if (showprogress)
 945                         stop_progress_meter();
 946                 if (count != 0 && wrerr == NO &&
 947                     atomicio(vwrite, ofd, bp->buf, count) != count) {
 948                         wrerr = YES;
 949                         wrerrno = errno;
 950                 }
 951                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
 952                         run_err("%s: truncate: %s", np, strerror(errno));
 953                         wrerr = DISPLAYED;
 954                 }
 955                 if (pflag) {
 956                         if (exists || omode != mode)
 957 #ifdef HAVE_FCHMOD
 958                                 if (fchmod(ofd, omode)) {
 959 #else /* HAVE_FCHMOD */
 960                                 if (chmod(np, omode)) {
 961 #endif /* HAVE_FCHMOD */
 962                                         run_err("%s: set mode: %s",
 963                                             np, strerror(errno));
 964                                         wrerr = DISPLAYED;
 965                                 }
 966                 } else {
 967                         if (!exists && omode != mode)
 968 #ifdef HAVE_FCHMOD
 969                                 if (fchmod(ofd, omode & ~mask)) {
 970 #else /* HAVE_FCHMOD */
 971                                 if (chmod(np, omode & ~mask)) {
 972 #endif /* HAVE_FCHMOD */
 973                                         run_err("%s: set mode: %s",
 974                                             np, strerror(errno));
 975                                         wrerr = DISPLAYED;
 976                                 }
 977                 }
 978                 if (close(ofd) == -1) {
 979                         wrerr = YES;
 980                         wrerrno = errno;
 981                 }
 982                 (void) response();
 983                 if (setimes && wrerr == NO) {
 984                         setimes = 0;
 985                         if (utimes(np, tv) < 0) {
 986                                 run_err("%s: set times: %s",
 987                                     np, strerror(errno));
 988                                 wrerr = DISPLAYED;
 989                         }
 990                 }
 991                 switch (wrerr) {
 992                 case YES:
 993                         run_err("%s: %s", np, strerror(wrerrno));
 994                         break;
 995                 case NO:
 996                         (void) atomicio(vwrite, remout, "", 1);
 997                         break;
 998                 case DISPLAYED:
 999                         break;
1000                 }
1001         }
1002 screwup:
1003         run_err("protocol error: %s", why);
1004         exit(1);
1005 }
1006
1007 int
1008 response(void)
1009 {
1010         char ch, *cp, resp, rbuf[2048];
1011
1012         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1013                 lostconn(0);
1014
1015         cp = rbuf;
1016         switch (resp) {
1017         case 0:         /* ok */
1018                 return (0);
1019         default:
1020                 *cp++ = resp;
1021                 /* FALLTHROUGH */
1022         case 1:         /* error, followed by error msg */
1023         case 2:         /* fatal error, "" */
1024                 do {
1025                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1026                                 lostconn(0);
1027                         *cp++ = ch;
1028                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1029
1030                 if (!iamremote)
1031                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1032                 ++errs;
1033                 if (resp == 1)
1034                         return (-1);
1035                 exit(1);
1036         }
1037         /* NOTREACHED */
1038 }
1039
1040 void
1041 usage(void)
1042 {
1043         (void) fprintf(stderr,
1044             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1045             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1046             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1047         exit(1);
1048 }
1049
1050 void
1051 run_err(const char *fmt,...)
1052 {
1053         static FILE *fp;
1054         va_list ap;
1055
1056         ++errs;
1057         if (fp == NULL && !(fp = fdopen(remout, "w")))
1058                 return;
1059         (void) fprintf(fp, "%c", 0x01);
1060         (void) fprintf(fp, "scp: ");
1061         va_start(ap, fmt);
1062         (void) vfprintf(fp, fmt, ap);
1063         va_end(ap);
1064         (void) fprintf(fp, "\n");
1065         (void) fflush(fp);
1066
1067         if (!iamremote) {
1068                 va_start(ap, fmt);
1069                 vfprintf(stderr, fmt, ap);
1070                 va_end(ap);
1071                 fprintf(stderr, "\n");
1072         }
1073 }
1074
1075 void
1076 verifydir(char *cp)
1077 {
1078         struct stat stb;
1079
1080         if (!stat(cp, &stb)) {
1081                 if (S_ISDIR(stb.st_mode))
1082                         return;
1083                 errno = ENOTDIR;
1084         }
1085         run_err("%s: %s", cp, strerror(errno));
1086         killchild(0);
1087 }
1088
1089 int
1090 okname(char *cp0)
1091 {
1092         int c;
1093         char *cp;
1094
1095         cp = cp0;
1096         do {
1097                 c = (int)*cp;
1098                 if (c & 0200)
1099                         goto bad;
1100                 if (!isalpha(c) && !isdigit(c)) {
1101                         switch (c) {
1102                         case '\'':
1103                         case '"':
1104                         case '`':
1105                         case ' ':
1106                         case '#':
1107                                 goto bad;
1108                         default:
1109                                 break;
1110                         }
1111                 }
1112         } while (*++cp);
1113         return (1);
1114
1115 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1116         return (0);
1117 }
1118
1119 BUF *
1120 allocbuf(BUF *bp, int fd, int blksize)
1121 {
1122         size_t size;
1123 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1124         struct stat stb;
1125
1126         if (fstat(fd, &stb) < 0) {
1127                 run_err("fstat: %s", strerror(errno));
1128                 return (0);
1129         }
1130         size = roundup(stb.st_blksize, blksize);
1131         if (size == 0)
1132                 size = blksize;
1133 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1134         size = blksize;
1135 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1136         if (bp->cnt >= size)
1137                 return (bp);
1138         if (bp->buf == NULL)
1139                 bp->buf = xmalloc(size);
1140         else
1141                 bp->buf = xrealloc(bp->buf, size);
1142         memset(bp->buf, 0, size);
1143         bp->cnt = size;
1144         return (bp);
1145 }
1146
1147 void
1148 lostconn(int signo)
1149 {
1150         if (!iamremote)
1151                 write(STDERR_FILENO, "lost connection\n", 16);
1152         if (signo)
1153                 _exit(1);
1154         else
1155                 exit(1);
1156 }