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 1.121 2005/04/02 12:41:16 djm 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);
 113                 waitpid(do_cmd_pid, NULL, 0);
 114         }
 115
 116         _exit(1);
 117 }
 118
 119 /*
 120  * This function executes the given command as the specified user on the
 121  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 122  * assigns the input and output file descriptors on success.
 123  */
 124
 125 int
 126 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
 127 {
 128         int pin[2], pout[2], reserved[2];
 129
 130         if (verbose_mode)
 131                 fprintf(stderr,
 132                     "Executing: program %s host %s, user %s, command %s\n",
 133                     ssh_program, host,
 134                     remuser ? remuser : "(unspecified)", cmd);
 135
 136         /*
 137          * Reserve two descriptors so that the real pipes won't get
 138          * descriptors 0 and 1 because that will screw up dup2 below.
 139          */
 140         pipe(reserved);
 141
 142         /* Create a socket pair for communicating with ssh. */
 143         if (pipe(pin) < 0)
 144                 fatal("pipe: %s", strerror(errno));
 145         if (pipe(pout) < 0)
 146                 fatal("pipe: %s", strerror(errno));
 147
 148         /* Free the reserved descriptors. */
 149         close(reserved[0]);
 150         close(reserved[1]);
 151
 152         /* Fork a child to execute the command on the remote host using ssh. */
 153         do_cmd_pid = fork();
 154         if (do_cmd_pid == 0) {
 155                 /* Child. */
 156                 close(pin[1]);
 157                 close(pout[0]);
 158                 dup2(pin[0], 0);
 159                 dup2(pout[1], 1);
 160                 close(pin[0]);
 161                 close(pout[1]);
 162
 163                 args.list[0] = ssh_program;
 164                 if (remuser != NULL)
 165                         addargs(&args, "-l%s", remuser);
 166                 addargs(&args, "%s", host);
 167                 addargs(&args, "%s", cmd);
 168
 169                 execvp(ssh_program, args.list);
 170                 perror(ssh_program);
 171                 exit(1);
 172         } else if (do_cmd_pid == -1) {
 173                 fatal("fork: %s", strerror(errno));
 174         }
 175         /* Parent.  Close the other side, and return the local side. */
 176         close(pin[0]);
 177         *fdout = pin[1];
 178         close(pout[1]);
 179         *fdin = pout[0];
 180         signal(SIGTERM, killchild);
 181         signal(SIGINT, killchild);
 182         signal(SIGHUP, killchild);
 183         return 0;
 184 }
 185
 186 typedef struct {
 187         int cnt;
 188         char *buf;
 189 } BUF;
 190
 191 BUF *allocbuf(BUF *, int, int);
 192 void lostconn(int);
 193 void nospace(void);
 194 int okname(char *);
 195 void run_err(const char *,...);
 196 void verifydir(char *);
 197
 198 struct passwd *pwd;
 199 uid_t userid;
 200 int errs, remin, remout;
 201 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 202
 203 #define CMDNEEDS        64
 204 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 205
 206 int response(void);
 207 void rsource(char *, struct stat *);
 208 void sink(int, char *[]);
 209 void source(int, char *[]);
 210 void tolocal(int, char *[]);
 211 void toremote(char *, int, char *[]);
 212 void usage(void);
 213
 214 int
 215 main(int argc, char **argv)
 216 {
 217         int ch, fflag, tflag, status;
 218         double speed;
 219         char *targ, *endp;
 220         extern char *optarg;
 221         extern int optind;
 222
 223         __progname = ssh_get_progname(argv[0]);
 224
 225         args.list = NULL;
 226         addargs(&args, "ssh");          /* overwritten with ssh_program */
 227         addargs(&args, "-x");
 228         addargs(&args, "-oForwardAgent no");
 229         addargs(&args, "-oClearAllForwardings yes");
 230
 231         fflag = tflag = 0;
 232         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 233                 switch (ch) {
 234                 /* User-visible flags. */
 235                 case '1':
 236                 case '2':
 237                 case '4':
 238                 case '6':
 239                 case 'C':
 240                         addargs(&args, "-%c", ch);
 241                         break;
 242                 case 'o':
 243                 case 'c':
 244                 case 'i':
 245                 case 'F':
 246                         addargs(&args, "-%c%s", ch, optarg);
 247                         break;
 248                 case 'P':
 249                         addargs(&args, "-p%s", optarg);
 250                         break;
 251                 case 'B':
 252                         addargs(&args, "-oBatchmode yes");
 253                         break;
 254                 case 'l':
 255                         speed = strtod(optarg, &endp);
 256                         if (speed <= 0 || *endp != '\0')
 257                                 usage();
 258                         limit_rate = speed * 1024;
 259                         break;
 260                 case 'p':
 261                         pflag = 1;
 262                         break;
 263                 case 'r':
 264                         iamrecursive = 1;
 265                         break;
 266                 case 'S':
 267                         ssh_program = xstrdup(optarg);
 268                         break;
 269                 case 'v':
 270                         addargs(&args, "-v");
 271                         verbose_mode = 1;
 272                         break;
 273                 case 'q':
 274                         addargs(&args, "-q");
 275                         showprogress = 0;
 276                         break;
 277
 278                 /* Server options. */
 279                 case 'd':
 280                         targetshouldbedirectory = 1;
 281                         break;
 282                 case 'f':       /* "from" */
 283                         iamremote = 1;
 284                         fflag = 1;
 285                         break;
 286                 case 't':       /* "to" */
 287                         iamremote = 1;
 288                         tflag = 1;
 289 #ifdef HAVE_CYGWIN
 290                         setmode(0, O_BINARY);
 291 #endif
 292                         break;
 293                 default:
 294                         usage();
 295                 }
 296         argc -= optind;
 297         argv += optind;
 298
 299         if ((pwd = getpwuid(userid = getuid())) == NULL)
 300                 fatal("unknown user %u", (u_int) userid);
 301
 302         if (!isatty(STDERR_FILENO))
 303                 showprogress = 0;
 304
 305         remin = STDIN_FILENO;
 306         remout = STDOUT_FILENO;
 307
 308         if (fflag) {
 309                 /* Follow "protocol", send data. */
 310                 (void) response();
 311                 source(argc, argv);
 312                 exit(errs != 0);
 313         }
 314         if (tflag) {
 315                 /* Receive data. */
 316                 sink(argc, argv);
 317                 exit(errs != 0);
 318         }
 319         if (argc < 2)
 320                 usage();
 321         if (argc > 2)
 322                 targetshouldbedirectory = 1;
 323
 324         remin = remout = -1;
 325         do_cmd_pid = -1;
 326         /* Command to be executed on remote system using "ssh". */
 327         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 328             verbose_mode ? " -v" : "",
 329             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 330             targetshouldbedirectory ? " -d" : "");
 331
 332         (void) signal(SIGPIPE, lostconn);
 333
 334         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 335                 toremote(targ, argc, argv);
 336         else {
 337                 tolocal(argc, argv);    /* Dest is local host. */
 338                 if (targetshouldbedirectory)
 339                         verifydir(argv[argc - 1]);
 340         }
 341         /*
 342          * Finally check the exit status of the ssh process, if one was forked
 343          * and no error has occured yet
 344          */
 345         if (do_cmd_pid != -1 && errs == 0) {
 346                 if (remin != -1)
 347                     (void) close(remin);
 348                 if (remout != -1)
 349                     (void) close(remout);
 350                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 351                         errs = 1;
 352                 else {
 353                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 354                                 errs = 1;
 355                 }
 356         }
 357         exit(errs != 0);
 358 }
 359
 360 void
 361 toremote(char *targ, int argc, char **argv)
 362 {
 363         int i, len;
 364         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 365
 366         *targ++ = 0;
 367         if (*targ == 0)
 368                 targ = ".";
 369
 370         arg = xstrdup(argv[argc - 1]);
 371         if ((thost = strrchr(arg, '@'))) {
 372                 /* user@host */
 373                 *thost++ = 0;
 374                 tuser = arg;
 375                 if (*tuser == '\0')
 376                         tuser = NULL;
 377         } else {
 378                 thost = arg;
 379                 tuser = NULL;
 380         }
 381
 382         for (i = 0; i < argc - 1; i++) {
 383                 src = colon(argv[i]);
 384                 if (src) {      /* remote to remote */
 385                         static char *ssh_options =
 386                             "-x -o'ClearAllForwardings yes'";
 387                         *src++ = 0;
 388                         if (*src == 0)
 389                                 src = ".";
 390                         host = strrchr(argv[i], '@');
 391                         len = strlen(ssh_program) + strlen(argv[i]) +
 392                             strlen(src) + (tuser ? strlen(tuser) : 0) +
 393                             strlen(thost) + strlen(targ) +
 394                             strlen(ssh_options) + CMDNEEDS + 20;
 395                         bp = xmalloc(len);
 396                         if (host) {
 397                                 *host++ = 0;
 398                                 host = cleanhostname(host);
 399                                 suser = argv[i];
 400                                 if (*suser == '\0')
 401                                         suser = pwd->pw_name;
 402                                 else if (!okname(suser)) {
 403                                         xfree(bp);
 404                                         continue;
 405                                 }
 406                                 if (tuser && !okname(tuser)) {
 407                                         xfree(bp);
 408                                         continue;
 409                                 }
 410                                 snprintf(bp, len,
 411                                     "%s%s %s -n "
 412                                     "-l %s %s %s %s '%s%s%s:%s'",
 413                                     ssh_program, verbose_mode ? " -v" : "",
 414                                     ssh_options, suser, host, cmd, src,
 415                                     tuser ? tuser : "", tuser ? "@" : "",
 416                                     thost, targ);
 417                         } else {
 418                                 host = cleanhostname(argv[i]);
 419                                 snprintf(bp, len,
 420                                     "exec %s%s %s -n %s "
 421                                     "%s %s '%s%s%s:%s'",
 422                                     ssh_program, verbose_mode ? " -v" : "",
 423                                     ssh_options, host, cmd, src,
 424                                     tuser ? tuser : "", tuser ? "@" : "",
 425                                     thost, targ);
 426                         }
 427                         if (verbose_mode)
 428                                 fprintf(stderr, "Executing: %s\n", bp);
 429                         if (system(bp) != 0)
 430                                 errs = 1;
 431                         (void) xfree(bp);
 432                 } else {        /* local to remote */
 433                         if (remin == -1) {
 434                                 len = strlen(targ) + CMDNEEDS + 20;
 435                                 bp = xmalloc(len);
 436                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
 437                                 host = cleanhostname(thost);
 438                                 if (do_cmd(host, tuser, bp, &remin,
 439                                     &remout, argc) < 0)
 440                                         exit(1);
 441                                 if (response() < 0)
 442                                         exit(1);
 443                                 (void) xfree(bp);
 444                         }
 445                         source(1, argv + i);
 446                 }
 447         }
 448 }
 449
 450 void
 451 tolocal(int argc, char **argv)
 452 {
 453         int i, len;
 454         char *bp, *host, *src, *suser;
 455
 456         for (i = 0; i < argc - 1; i++) {
 457                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 458                         len = strlen(_PATH_CP) + strlen(argv[i]) +
 459                             strlen(argv[argc - 1]) + 20;
 460                         bp = xmalloc(len);
 461                         (void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
 462                             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 463                             argv[i], argv[argc - 1]);
 464                         if (verbose_mode)
 465                                 fprintf(stderr, "Executing: %s\n", bp);
 466                         if (system(bp))
 467                                 ++errs;
 468                         (void) xfree(bp);
 469                         continue;
 470                 }
 471                 *src++ = 0;
 472                 if (*src == 0)
 473                         src = ".";
 474                 if ((host = strrchr(argv[i], '@')) == NULL) {
 475                         host = argv[i];
 476                         suser = NULL;
 477                 } else {
 478                         *host++ = 0;
 479                         suser = argv[i];
 480                         if (*suser == '\0')
 481                                 suser = pwd->pw_name;
 482                 }
 483                 host = cleanhostname(host);
 484                 len = strlen(src) + CMDNEEDS + 20;
 485                 bp = xmalloc(len);
 486                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
 487                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
 488                         (void) xfree(bp);
 489                         ++errs;
 490                         continue;
 491                 }
 492                 xfree(bp);
 493                 sink(1, argv + argc - 1);
 494                 (void) close(remin);
 495                 remin = remout = -1;
 496         }
 497 }
 498
 499 void
 500 source(int argc, char **argv)
 501 {
 502         struct stat stb;
 503         static BUF buffer;
 504         BUF *bp;
 505         off_t i, amt, result, statbytes;
 506         int fd, haderr, indx;
 507         char *last, *name, buf[2048];
 508         int len;
 509
 510         for (indx = 0; indx < argc; ++indx) {
 511                 name = argv[indx];
 512                 statbytes = 0;
 513                 len = strlen(name);
 514                 while (len > 1 && name[len-1] == '/')
 515                         name[--len] = '\0';
 516                 if (strchr(name, '\n') != NULL) {
 517                         run_err("%s: skipping, filename contains a newline",
 518                             name);
 519                         goto next;
 520                 }
 521                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 522                         goto syserr;
 523                 if (fstat(fd, &stb) < 0) {
 524 syserr:                 run_err("%s: %s", name, strerror(errno));
 525                         goto next;
 526                 }
 527                 switch (stb.st_mode & S_IFMT) {
 528                 case S_IFREG:
 529                         break;
 530                 case S_IFDIR:
 531                         if (iamrecursive) {
 532                                 rsource(name, &stb);
 533                                 goto next;
 534                         }
 535                         /* FALLTHROUGH */
 536                 default:
 537                         run_err("%s: not a regular file", name);
 538                         goto next;
 539                 }
 540                 if ((last = strrchr(name, '/')) == NULL)
 541                         last = name;
 542                 else
 543                         ++last;
 544                 curfile = last;
 545                 if (pflag) {
 546                         /*
 547                          * Make it compatible with possible future
 548                          * versions expecting microseconds.
 549                          */
 550                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 551                             (u_long) stb.st_mtime,
 552                             (u_long) stb.st_atime);
 553                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 554                         if (response() < 0)
 555                                 goto next;
 556                 }
 557 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 558                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 559                     (u_int) (stb.st_mode & FILEMODEMASK),
 560                     (int64_t)stb.st_size, last);
 561                 if (verbose_mode) {
 562                         fprintf(stderr, "Sending file modes: %s", buf);
 563                 }
 564                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 565                 if (response() < 0)
 566                         goto next;
 567                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 568 next:                   (void) close(fd);
 569                         continue;
 570                 }
 571                 if (showprogress)
 572                         start_progress_meter(curfile, stb.st_size, &statbytes);
 573                 /* Keep writing after an error so that we stay sync'd up. */
 574                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 575                         amt = bp->cnt;
 576                         if (i + amt > stb.st_size)
 577                                 amt = stb.st_size - i;
 578                         if (!haderr) {
 579                                 result = atomicio(read, fd, bp->buf, amt);
 580                                 if (result != amt)
 581                                         haderr = result >= 0 ? EIO : errno;
 582                         }
 583                         if (haderr)
 584                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 585                         else {
 586                                 result = atomicio(vwrite, remout, bp->buf, amt);
 587                                 if (result != amt)
 588                                         haderr = result >= 0 ? EIO : errno;
 589                                 statbytes += result;
 590                         }
 591                         if (limit_rate)
 592                                 bwlimit(amt);
 593                 }
 594                 if (showprogress)
 595                         stop_progress_meter();
 596
 597                 if (close(fd) < 0 && !haderr)
 598                         haderr = errno;
 599                 if (!haderr)
 600                         (void) atomicio(vwrite, remout, "", 1);
 601                 else
 602                         run_err("%s: %s", name, strerror(haderr));
 603                 (void) response();
 604         }
 605 }
 606
 607 void
 608 rsource(char *name, struct stat *statp)
 609 {
 610         DIR *dirp;
 611         struct dirent *dp;
 612         char *last, *vect[1], path[1100];
 613
 614         if (!(dirp = opendir(name))) {
 615                 run_err("%s: %s", name, strerror(errno));
 616                 return;
 617         }
 618         last = strrchr(name, '/');
 619         if (last == 0)
 620                 last = name;
 621         else
 622                 last++;
 623         if (pflag) {
 624                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 625                     (u_long) statp->st_mtime,
 626                     (u_long) statp->st_atime);
 627                 (void) atomicio(vwrite, remout, path, strlen(path));
 628                 if (response() < 0) {
 629                         closedir(dirp);
 630                         return;
 631                 }
 632         }
 633         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 634             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 635         if (verbose_mode)
 636                 fprintf(stderr, "Entering directory: %s", path);
 637         (void) atomicio(vwrite, remout, path, strlen(path));
 638         if (response() < 0) {
 639                 closedir(dirp);
 640                 return;
 641         }
 642         while ((dp = readdir(dirp)) != NULL) {
 643                 if (dp->d_ino == 0)
 644                         continue;
 645                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 646                         continue;
 647                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 648                         run_err("%s/%s: name too long", name, dp->d_name);
 649                         continue;
 650                 }
 651                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 652                 vect[0] = path;
 653                 source(1, vect);
 654         }
 655         (void) closedir(dirp);
 656         (void) atomicio(vwrite, remout, "E\n", 2);
 657         (void) response();
 658 }
 659
 660 void
 661 bwlimit(int amount)
 662 {
 663         static struct timeval bwstart, bwend;
 664         static int lamt, thresh = 16384;
 665         u_int64_t waitlen;
 666         struct timespec ts, rm;
 667
 668         if (!timerisset(&bwstart)) {
 669                 gettimeofday(&bwstart, NULL);
 670                 return;
 671         }
 672
 673         lamt += amount;
 674         if (lamt < thresh)
 675                 return;
 676
 677         gettimeofday(&bwend, NULL);
 678         timersub(&bwend, &bwstart, &bwend);
 679         if (!timerisset(&bwend))
 680                 return;
 681
 682         lamt *= 8;
 683         waitlen = (double)1000000L * lamt / limit_rate;
 684
 685         bwstart.tv_sec = waitlen / 1000000L;
 686         bwstart.tv_usec = waitlen % 1000000L;
 687
 688         if (timercmp(&bwstart, &bwend, >)) {
 689                 timersub(&bwstart, &bwend, &bwend);
 690
 691                 /* Adjust the wait time */
 692                 if (bwend.tv_sec) {
 693                         thresh /= 2;
 694                         if (thresh < 2048)
 695                                 thresh = 2048;
 696                 } else if (bwend.tv_usec < 100) {
 697                         thresh *= 2;
 698                         if (thresh > 32768)
 699                                 thresh = 32768;
 700                 }
 701
 702                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 703                 while (nanosleep(&ts, &rm) == -1) {
 704                         if (errno != EINTR)
 705                                 break;
 706                         ts = rm;
 707                 }
 708         }
 709
 710         lamt = 0;
 711         gettimeofday(&bwstart, NULL);
 712 }
 713
 714 void
 715 sink(int argc, char **argv)
 716 {
 717         static BUF buffer;
 718         struct stat stb;
 719         enum {
 720                 YES, NO, DISPLAYED
 721         } wrerr;
 722         BUF *bp;
 723         off_t i, j;
 724         int amt, count, exists, first, mask, mode, ofd, omode;
 725         off_t size, statbytes;
 726         int setimes, targisdir, wrerrno = 0;
 727         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 728         struct timeval tv[2];
 729
 730 #define atime   tv[0]
 731 #define mtime   tv[1]
 732 #define SCREWUP(str)    { why = str; goto screwup; }
 733
 734         setimes = targisdir = 0;
 735         mask = umask(0);
 736         if (!pflag)
 737                 (void) umask(mask);
 738         if (argc != 1) {
 739                 run_err("ambiguous target");
 740                 exit(1);
 741         }
 742         targ = *argv;
 743         if (targetshouldbedirectory)
 744                 verifydir(targ);
 745
 746         (void) atomicio(vwrite, remout, "", 1);
 747         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 748                 targisdir = 1;
 749         for (first = 1;; first = 0) {
 750                 cp = buf;
 751                 if (atomicio(read, remin, cp, 1) <= 0)
 752                         return;
 753                 if (*cp++ == '\n')
 754                         SCREWUP("unexpected <newline>");
 755                 do {
 756                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 757                                 SCREWUP("lost connection");
 758                         *cp++ = ch;
 759                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 760                 *cp = 0;
 761                 if (verbose_mode)
 762                         fprintf(stderr, "Sink: %s", buf);
 763
 764                 if (buf[0] == '\01' || buf[0] == '\02') {
 765                         if (iamremote == 0)
 766                                 (void) atomicio(vwrite, STDERR_FILENO,
 767                                     buf + 1, strlen(buf + 1));
 768                         if (buf[0] == '\02')
 769                                 exit(1);
 770                         ++errs;
 771                         continue;
 772                 }
 773                 if (buf[0] == 'E') {
 774                         (void) atomicio(vwrite, remout, "", 1);
 775                         return;
 776                 }
 777                 if (ch == '\n')
 778                         *--cp = 0;
 779
 780                 cp = buf;
 781                 if (*cp == 'T') {
 782                         setimes++;
 783                         cp++;
 784                         mtime.tv_sec = strtol(cp, &cp, 10);
 785                         if (!cp || *cp++ != ' ')
 786                                 SCREWUP("mtime.sec not delimited");
 787                         mtime.tv_usec = strtol(cp, &cp, 10);
 788                         if (!cp || *cp++ != ' ')
 789                                 SCREWUP("mtime.usec not delimited");
 790                         atime.tv_sec = strtol(cp, &cp, 10);
 791                         if (!cp || *cp++ != ' ')
 792                                 SCREWUP("atime.sec not delimited");
 793                         atime.tv_usec = strtol(cp, &cp, 10);
 794                         if (!cp || *cp++ != '\0')
 795                                 SCREWUP("atime.usec not delimited");
 796                         (void) atomicio(vwrite, remout, "", 1);
 797                         continue;
 798                 }
 799                 if (*cp != 'C' && *cp != 'D') {
 800                         /*
 801                          * Check for the case "rcp remote:foo\* local:bar".
 802                          * In this case, the line "No match." can be returned
 803                          * by the shell before the rcp command on the remote is
 804                          * executed so the ^Aerror_message convention isn't
 805                          * followed.
 806                          */
 807                         if (first) {
 808                                 run_err("%s", cp);
 809                                 exit(1);
 810                         }
 811                         SCREWUP("expected control record");
 812                 }
 813                 mode = 0;
 814                 for (++cp; cp < buf + 5; cp++) {
 815                         if (*cp < '0' || *cp > '7')
 816                                 SCREWUP("bad mode");
 817                         mode = (mode << 3) | (*cp - '0');
 818                 }
 819                 if (*cp++ != ' ')
 820                         SCREWUP("mode not delimited");
 821
 822                 for (size = 0; isdigit(*cp);)
 823                         size = size * 10 + (*cp++ - '0');
 824                 if (*cp++ != ' ')
 825                         SCREWUP("size not delimited");
 826                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 827                         run_err("error: unexpected filename: %s", cp);
 828                         exit(1);
 829                 }
 830                 if (targisdir) {
 831                         static char *namebuf;
 832                         static int cursize;
 833                         size_t need;
 834
 835                         need = strlen(targ) + strlen(cp) + 250;
 836                         if (need > cursize) {
 837                                 if (namebuf)
 838                                         xfree(namebuf);
 839                                 namebuf = xmalloc(need);
 840                                 cursize = need;
 841                         }
 842                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 843                             strcmp(targ, "/") ? "/" : "", cp);
 844                         np = namebuf;
 845                 } else
 846                         np = targ;
 847                 curfile = cp;
 848                 exists = stat(np, &stb) == 0;
 849                 if (buf[0] == 'D') {
 850                         int mod_flag = pflag;
 851                         if (!iamrecursive)
 852                                 SCREWUP("received directory without -r");
 853                         if (exists) {
 854                                 if (!S_ISDIR(stb.st_mode)) {
 855                                         errno = ENOTDIR;
 856                                         goto bad;
 857                                 }
 858                                 if (pflag)
 859                                         (void) chmod(np, mode);
 860                         } else {
 861                                 /* Handle copying from a read-only
 862                                    directory */
 863                                 mod_flag = 1;
 864                                 if (mkdir(np, mode | S_IRWXU) < 0)
 865                                         goto bad;
 866                         }
 867                         vect[0] = xstrdup(np);
 868                         sink(1, vect);
 869                         if (setimes) {
 870                                 setimes = 0;
 871                                 if (utimes(vect[0], tv) < 0)
 872                                         run_err("%s: set times: %s",
 873                                             vect[0], strerror(errno));
 874                         }
 875                         if (mod_flag)
 876                                 (void) chmod(vect[0], mode);
 877                         if (vect[0])
 878                                 xfree(vect[0]);
 879                         continue;
 880                 }
 881                 omode = mode;
 882                 mode |= S_IWRITE;
 883                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 884 bad:                    run_err("%s: %s", np, strerror(errno));
 885                         continue;
 886                 }
 887                 (void) atomicio(vwrite, remout, "", 1);
 888                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 889                         (void) close(ofd);
 890                         continue;
 891                 }
 892                 cp = bp->buf;
 893                 wrerr = NO;
 894
 895                 statbytes = 0;
 896                 if (showprogress)
 897                         start_progress_meter(curfile, size, &statbytes);
 898                 for (count = i = 0; i < size; i += 4096) {
 899                         amt = 4096;
 900                         if (i + amt > size)
 901                                 amt = size - i;
 902                         count += amt;
 903                         do {
 904                                 j = atomicio(read, remin, cp, amt);
 905                                 if (j <= 0) {
 906                                         run_err("%s", j ? strerror(errno) :
 907                                             "dropped connection");
 908                                         exit(1);
 909                                 }
 910                                 amt -= j;
 911                                 cp += j;
 912                                 statbytes += j;
 913                         } while (amt > 0);
 914
 915                         if (limit_rate)
 916                                 bwlimit(4096);
 917
 918                         if (count == bp->cnt) {
 919                                 /* Keep reading so we stay sync'd up. */
 920                                 if (wrerr == NO) {
 921                                         j = atomicio(vwrite, ofd, bp->buf, count);
 922                                         if (j != count) {
 923                                                 wrerr = YES;
 924                                                 wrerrno = j >= 0 ? EIO : errno;
 925                                         }
 926                                 }
 927                                 count = 0;
 928                                 cp = bp->buf;
 929                         }
 930                 }
 931                 if (showprogress)
 932                         stop_progress_meter();
 933                 if (count != 0 && wrerr == NO &&
 934                     (j = atomicio(vwrite, ofd, bp->buf, count)) != count) {
 935                         wrerr = YES;
 936                         wrerrno = j >= 0 ? EIO : errno;
 937                 }
 938                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
 939                         run_err("%s: truncate: %s", np, strerror(errno));
 940                         wrerr = DISPLAYED;
 941                 }
 942                 if (pflag) {
 943                         if (exists || omode != mode)
 944 #ifdef HAVE_FCHMOD
 945                                 if (fchmod(ofd, omode)) {
 946 #else /* HAVE_FCHMOD */
 947                                 if (chmod(np, omode)) {
 948 #endif /* HAVE_FCHMOD */
 949                                         run_err("%s: set mode: %s",
 950                                             np, strerror(errno));
 951                                         wrerr = DISPLAYED;
 952                                 }
 953                 } else {
 954                         if (!exists && omode != mode)
 955 #ifdef HAVE_FCHMOD
 956                                 if (fchmod(ofd, omode & ~mask)) {
 957 #else /* HAVE_FCHMOD */
 958                                 if (chmod(np, omode & ~mask)) {
 959 #endif /* HAVE_FCHMOD */
 960                                         run_err("%s: set mode: %s",
 961                                             np, strerror(errno));
 962                                         wrerr = DISPLAYED;
 963                                 }
 964                 }
 965                 if (close(ofd) == -1) {
 966                         wrerr = YES;
 967                         wrerrno = errno;
 968                 }
 969                 (void) response();
 970                 if (setimes && wrerr == NO) {
 971                         setimes = 0;
 972                         if (utimes(np, tv) < 0) {
 973                                 run_err("%s: set times: %s",
 974                                     np, strerror(errno));
 975                                 wrerr = DISPLAYED;
 976                         }
 977                 }
 978                 switch (wrerr) {
 979                 case YES:
 980                         run_err("%s: %s", np, strerror(wrerrno));
 981                         break;
 982                 case NO:
 983                         (void) atomicio(vwrite, remout, "", 1);
 984                         break;
 985                 case DISPLAYED:
 986                         break;
 987                 }
 988         }
 989 screwup:
 990         run_err("protocol error: %s", why);
 991         exit(1);
 992 }
 993
 994 int
 995 response(void)
 996 {
 997         char ch, *cp, resp, rbuf[2048];
 998
 999         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1000                 lostconn(0);
1001
1002         cp = rbuf;
1003         switch (resp) {
1004         case 0:         /* ok */
1005                 return (0);
1006         default:
1007                 *cp++ = resp;
1008                 /* FALLTHROUGH */
1009         case 1:         /* error, followed by error msg */
1010         case 2:         /* fatal error, "" */
1011                 do {
1012                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1013                                 lostconn(0);
1014                         *cp++ = ch;
1015                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1016
1017                 if (!iamremote)
1018                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1019                 ++errs;
1020                 if (resp == 1)
1021                         return (-1);
1022                 exit(1);
1023         }
1024         /* NOTREACHED */
1025 }
1026
1027 void
1028 usage(void)
1029 {
1030         (void) fprintf(stderr,
1031             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1032             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1033             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1034         exit(1);
1035 }
1036
1037 void
1038 run_err(const char *fmt,...)
1039 {
1040         static FILE *fp;
1041         va_list ap;
1042
1043         ++errs;
1044         if (fp == NULL && !(fp = fdopen(remout, "w")))
1045                 return;
1046         (void) fprintf(fp, "%c", 0x01);
1047         (void) fprintf(fp, "scp: ");
1048         va_start(ap, fmt);
1049         (void) vfprintf(fp, fmt, ap);
1050         va_end(ap);
1051         (void) fprintf(fp, "\n");
1052         (void) fflush(fp);
1053
1054         if (!iamremote) {
1055                 va_start(ap, fmt);
1056                 vfprintf(stderr, fmt, ap);
1057                 va_end(ap);
1058                 fprintf(stderr, "\n");
1059         }
1060 }
1061
1062 void
1063 verifydir(char *cp)
1064 {
1065         struct stat stb;
1066
1067         if (!stat(cp, &stb)) {
1068                 if (S_ISDIR(stb.st_mode))
1069                         return;
1070                 errno = ENOTDIR;
1071         }
1072         run_err("%s: %s", cp, strerror(errno));
1073         exit(1);
1074 }
1075
1076 int
1077 okname(char *cp0)
1078 {
1079         int c;
1080         char *cp;
1081
1082         cp = cp0;
1083         do {
1084                 c = (int)*cp;
1085                 if (c & 0200)
1086                         goto bad;
1087                 if (!isalpha(c) && !isdigit(c)) {
1088                         switch (c) {
1089                         case '\'':
1090                         case '"':
1091                         case '`':
1092                         case ' ':
1093                         case '#':
1094                                 goto bad;
1095                         default:
1096                                 break;
1097                         }
1098                 }
1099         } while (*++cp);
1100         return (1);
1101
1102 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1103         return (0);
1104 }
1105
1106 BUF *
1107 allocbuf(BUF *bp, int fd, int blksize)
1108 {
1109         size_t size;
1110 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1111         struct stat stb;
1112
1113         if (fstat(fd, &stb) < 0) {
1114                 run_err("fstat: %s", strerror(errno));
1115                 return (0);
1116         }
1117         size = roundup(stb.st_blksize, blksize);
1118         if (size == 0)
1119                 size = blksize;
1120 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1121         size = blksize;
1122 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1123         if (bp->cnt >= size)
1124                 return (bp);
1125         if (bp->buf == NULL)
1126                 bp->buf = xmalloc(size);
1127         else
1128                 bp->buf = xrealloc(bp->buf, size);
1129         memset(bp->buf, 0, size);
1130         bp->cnt = size;
1131         return (bp);
1132 }
1133
1134 void
1135 lostconn(int signo)
1136 {
1137         if (!iamremote)
1138                 write(STDERR_FILENO, "lost connection\n", 16);
1139         if (signo)
1140                 _exit(1);
1141         else
1142                 exit(1);
1143 }