crypto/openssh-4/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 1.125 2005/07/27 10:39:03 dtucker 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         __progname = ssh_get_progname(argv[0]);
 226
 227         args.list = NULL;
 228         addargs(&args, "ssh");          /* overwritten with ssh_program */
 229         addargs(&args, "-x");
 230         addargs(&args, "-oForwardAgent no");
 231         addargs(&args, "-oClearAllForwardings yes");
 232
 233         fflag = tflag = 0;
 234         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 235                 switch (ch) {
 236                 /* User-visible flags. */
 237                 case '1':
 238                 case '2':
 239                 case '4':
 240                 case '6':
 241                 case 'C':
 242                         addargs(&args, "-%c", ch);
 243                         break;
 244                 case 'o':
 245                 case 'c':
 246                 case 'i':
 247                 case 'F':
 248                         addargs(&args, "-%c%s", ch, optarg);
 249                         break;
 250                 case 'P':
 251                         addargs(&args, "-p%s", optarg);
 252                         break;
 253                 case 'B':
 254                         addargs(&args, "-oBatchmode yes");
 255                         break;
 256                 case 'l':
 257                         speed = strtod(optarg, &endp);
 258                         if (speed <= 0 || *endp != '\0')
 259                                 usage();
 260                         limit_rate = speed * 1024;
 261                         break;
 262                 case 'p':
 263                         pflag = 1;
 264                         break;
 265                 case 'r':
 266                         iamrecursive = 1;
 267                         break;
 268                 case 'S':
 269                         ssh_program = xstrdup(optarg);
 270                         break;
 271                 case 'v':
 272                         addargs(&args, "-v");
 273                         verbose_mode = 1;
 274                         break;
 275                 case 'q':
 276                         addargs(&args, "-q");
 277                         showprogress = 0;
 278                         break;
 279
 280                 /* Server options. */
 281                 case 'd':
 282                         targetshouldbedirectory = 1;
 283                         break;
 284                 case 'f':       /* "from" */
 285                         iamremote = 1;
 286                         fflag = 1;
 287                         break;
 288                 case 't':       /* "to" */
 289                         iamremote = 1;
 290                         tflag = 1;
 291 #ifdef HAVE_CYGWIN
 292                         setmode(0, O_BINARY);
 293 #endif
 294                         break;
 295                 default:
 296                         usage();
 297                 }
 298         argc -= optind;
 299         argv += optind;
 300
 301         if ((pwd = getpwuid(userid = getuid())) == NULL)
 302                 fatal("unknown user %u", (u_int) userid);
 303
 304         if (!isatty(STDERR_FILENO))
 305                 showprogress = 0;
 306
 307         remin = STDIN_FILENO;
 308         remout = STDOUT_FILENO;
 309
 310         if (fflag) {
 311                 /* Follow "protocol", send data. */
 312                 (void) response();
 313                 source(argc, argv);
 314                 exit(errs != 0);
 315         }
 316         if (tflag) {
 317                 /* Receive data. */
 318                 sink(argc, argv);
 319                 exit(errs != 0);
 320         }
 321         if (argc < 2)
 322                 usage();
 323         if (argc > 2)
 324                 targetshouldbedirectory = 1;
 325
 326         remin = remout = -1;
 327         do_cmd_pid = -1;
 328         /* Command to be executed on remote system using "ssh". */
 329         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 330             verbose_mode ? " -v" : "",
 331             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 332             targetshouldbedirectory ? " -d" : "");
 333
 334         (void) signal(SIGPIPE, lostconn);
 335
 336         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 337                 toremote(targ, argc, argv);
 338         else {
 339                 tolocal(argc, argv);    /* Dest is local host. */
 340                 if (targetshouldbedirectory)
 341                         verifydir(argv[argc - 1]);
 342         }
 343         /*
 344          * Finally check the exit status of the ssh process, if one was forked
 345          * and no error has occured yet
 346          */
 347         if (do_cmd_pid != -1 && errs == 0) {
 348                 if (remin != -1)
 349                     (void) close(remin);
 350                 if (remout != -1)
 351                     (void) close(remout);
 352                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 353                         errs = 1;
 354                 else {
 355                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 356                                 errs = 1;
 357                 }
 358         }
 359         exit(errs != 0);
 360 }
 361
 362 void
 363 toremote(char *targ, int argc, char **argv)
 364 {
 365         int i, len;
 366         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 367
 368         *targ++ = 0;
 369         if (*targ == 0)
 370                 targ = ".";
 371
 372         arg = xstrdup(argv[argc - 1]);
 373         if ((thost = strrchr(arg, '@'))) {
 374                 /* user@host */
 375                 *thost++ = 0;
 376                 tuser = arg;
 377                 if (*tuser == '\0')
 378                         tuser = NULL;
 379         } else {
 380                 thost = arg;
 381                 tuser = NULL;
 382         }
 383
 384         for (i = 0; i < argc - 1; i++) {
 385                 src = colon(argv[i]);
 386                 if (src) {      /* remote to remote */
 387                         static char *ssh_options =
 388                             "-x -o'ClearAllForwardings yes'";
 389                         *src++ = 0;
 390                         if (*src == 0)
 391                                 src = ".";
 392                         host = strrchr(argv[i], '@');
 393                         len = strlen(ssh_program) + strlen(argv[i]) +
 394                             strlen(src) + (tuser ? strlen(tuser) : 0) +
 395                             strlen(thost) + strlen(targ) +
 396                             strlen(ssh_options) + CMDNEEDS + 20;
 397                         bp = xmalloc(len);
 398                         if (host) {
 399                                 *host++ = 0;
 400                                 host = cleanhostname(host);
 401                                 suser = argv[i];
 402                                 if (*suser == '\0')
 403                                         suser = pwd->pw_name;
 404                                 else if (!okname(suser)) {
 405                                         xfree(bp);
 406                                         continue;
 407                                 }
 408                                 if (tuser && !okname(tuser)) {
 409                                         xfree(bp);
 410                                         continue;
 411                                 }
 412                                 snprintf(bp, len,
 413                                     "%s%s %s -n "
 414                                     "-l %s %s %s %s '%s%s%s:%s'",
 415                                     ssh_program, verbose_mode ? " -v" : "",
 416                                     ssh_options, suser, host, cmd, src,
 417                                     tuser ? tuser : "", tuser ? "@" : "",
 418                                     thost, targ);
 419                         } else {
 420                                 host = cleanhostname(argv[i]);
 421                                 snprintf(bp, len,
 422                                     "exec %s%s %s -n %s "
 423                                     "%s %s '%s%s%s:%s'",
 424                                     ssh_program, verbose_mode ? " -v" : "",
 425                                     ssh_options, host, cmd, src,
 426                                     tuser ? tuser : "", tuser ? "@" : "",
 427                                     thost, targ);
 428                         }
 429                         if (verbose_mode)
 430                                 fprintf(stderr, "Executing: %s\n", bp);
 431                         if (system(bp) != 0)
 432                                 errs = 1;
 433                         (void) xfree(bp);
 434                 } else {        /* local to remote */
 435                         if (remin == -1) {
 436                                 len = strlen(targ) + CMDNEEDS + 20;
 437                                 bp = xmalloc(len);
 438                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
 439                                 host = cleanhostname(thost);
 440                                 if (do_cmd(host, tuser, bp, &remin,
 441                                     &remout, argc) < 0)
 442                                         exit(1);
 443                                 if (response() < 0)
 444                                         exit(1);
 445                                 (void) xfree(bp);
 446                         }
 447                         source(1, argv + i);
 448                 }
 449         }
 450 }
 451
 452 void
 453 tolocal(int argc, char **argv)
 454 {
 455         int i, len;
 456         char *bp, *host, *src, *suser;
 457
 458         for (i = 0; i < argc - 1; i++) {
 459                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 460                         len = strlen(_PATH_CP) + strlen(argv[i]) +
 461                             strlen(argv[argc - 1]) + 20;
 462                         bp = xmalloc(len);
 463                         (void) snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
 464                             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 465                             argv[i], argv[argc - 1]);
 466                         if (verbose_mode)
 467                                 fprintf(stderr, "Executing: %s\n", bp);
 468                         if (system(bp))
 469                                 ++errs;
 470                         (void) xfree(bp);
 471                         continue;
 472                 }
 473                 *src++ = 0;
 474                 if (*src == 0)
 475                         src = ".";
 476                 if ((host = strrchr(argv[i], '@')) == NULL) {
 477                         host = argv[i];
 478                         suser = NULL;
 479                 } else {
 480                         *host++ = 0;
 481                         suser = argv[i];
 482                         if (*suser == '\0')
 483                                 suser = pwd->pw_name;
 484                 }
 485                 host = cleanhostname(host);
 486                 len = strlen(src) + CMDNEEDS + 20;
 487                 bp = xmalloc(len);
 488                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
 489                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
 490                         (void) xfree(bp);
 491                         ++errs;
 492                         continue;
 493                 }
 494                 xfree(bp);
 495                 sink(1, argv + argc - 1);
 496                 (void) close(remin);
 497                 remin = remout = -1;
 498         }
 499 }
 500
 501 void
 502 source(int argc, char **argv)
 503 {
 504         struct stat stb;
 505         static BUF buffer;
 506         BUF *bp;
 507         off_t i, amt, statbytes;
 508         size_t result;
 509         int fd = -1, haderr, indx;
 510         char *last, *name, buf[2048];
 511         int len;
 512
 513         for (indx = 0; indx < argc; ++indx) {
 514                 name = argv[indx];
 515                 statbytes = 0;
 516                 len = strlen(name);
 517                 while (len > 1 && name[len-1] == '/')
 518                         name[--len] = '\0';
 519                 if (strchr(name, '\n') != NULL) {
 520                         run_err("%s: skipping, filename contains a newline",
 521                             name);
 522                         goto next;
 523                 }
 524                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 525                         goto syserr;
 526                 if (fstat(fd, &stb) < 0) {
 527 syserr:                 run_err("%s: %s", name, strerror(errno));
 528                         goto next;
 529                 }
 530                 switch (stb.st_mode & S_IFMT) {
 531                 case S_IFREG:
 532                         break;
 533                 case S_IFDIR:
 534                         if (iamrecursive) {
 535                                 rsource(name, &stb);
 536                                 goto next;
 537                         }
 538                         /* FALLTHROUGH */
 539                 default:
 540                         run_err("%s: not a regular file", name);
 541                         goto next;
 542                 }
 543                 if ((last = strrchr(name, '/')) == NULL)
 544                         last = name;
 545                 else
 546                         ++last;
 547                 curfile = last;
 548                 if (pflag) {
 549                         /*
 550                          * Make it compatible with possible future
 551                          * versions expecting microseconds.
 552                          */
 553                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 554                             (u_long) stb.st_mtime,
 555                             (u_long) stb.st_atime);
 556                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 557                         if (response() < 0)
 558                                 goto next;
 559                 }
 560 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 561                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 562                     (u_int) (stb.st_mode & FILEMODEMASK),
 563                     (int64_t)stb.st_size, last);
 564                 if (verbose_mode) {
 565                         fprintf(stderr, "Sending file modes: %s", buf);
 566                 }
 567                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 568                 if (response() < 0)
 569                         goto next;
 570                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 571 next:                   (void) close(fd);
 572                         continue;
 573                 }
 574                 if (showprogress)
 575                         start_progress_meter(curfile, stb.st_size, &statbytes);
 576                 /* Keep writing after an error so that we stay sync'd up. */
 577                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 578                         amt = bp->cnt;
 579                         if (i + amt > stb.st_size)
 580                                 amt = stb.st_size - i;
 581                         if (!haderr) {
 582                                 result = atomicio(read, fd, bp->buf, amt);
 583                                 if (result != amt)
 584                                         haderr = errno;
 585                         }
 586                         if (haderr)
 587                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 588                         else {
 589                                 result = atomicio(vwrite, remout, bp->buf, amt);
 590                                 if (result != amt)
 591                                         haderr = errno;
 592                                 statbytes += result;
 593                         }
 594                         if (limit_rate)
 595                                 bwlimit(amt);
 596                 }
 597                 if (showprogress)
 598                         stop_progress_meter();
 599
 600                 if (close(fd) < 0 && !haderr)
 601                         haderr = errno;
 602                 if (!haderr)
 603                         (void) atomicio(vwrite, remout, "", 1);
 604                 else
 605                         run_err("%s: %s", name, strerror(haderr));
 606                 (void) response();
 607         }
 608 }
 609
 610 void
 611 rsource(char *name, struct stat *statp)
 612 {
 613         DIR *dirp;
 614         struct dirent *dp;
 615         char *last, *vect[1], path[1100];
 616
 617         if (!(dirp = opendir(name))) {
 618                 run_err("%s: %s", name, strerror(errno));
 619                 return;
 620         }
 621         last = strrchr(name, '/');
 622         if (last == 0)
 623                 last = name;
 624         else
 625                 last++;
 626         if (pflag) {
 627                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 628                     (u_long) statp->st_mtime,
 629                     (u_long) statp->st_atime);
 630                 (void) atomicio(vwrite, remout, path, strlen(path));
 631                 if (response() < 0) {
 632                         closedir(dirp);
 633                         return;
 634                 }
 635         }
 636         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 637             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 638         if (verbose_mode)
 639                 fprintf(stderr, "Entering directory: %s", path);
 640         (void) atomicio(vwrite, remout, path, strlen(path));
 641         if (response() < 0) {
 642                 closedir(dirp);
 643                 return;
 644         }
 645         while ((dp = readdir(dirp)) != NULL) {
 646                 if (dp->d_ino == 0)
 647                         continue;
 648                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 649                         continue;
 650                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 651                         run_err("%s/%s: name too long", name, dp->d_name);
 652                         continue;
 653                 }
 654                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 655                 vect[0] = path;
 656                 source(1, vect);
 657         }
 658         (void) closedir(dirp);
 659         (void) atomicio(vwrite, remout, "E\n", 2);
 660         (void) response();
 661 }
 662
 663 void
 664 bwlimit(int amount)
 665 {
 666         static struct timeval bwstart, bwend;
 667         static int lamt, thresh = 16384;
 668         u_int64_t waitlen;
 669         struct timespec ts, rm;
 670
 671         if (!timerisset(&bwstart)) {
 672                 gettimeofday(&bwstart, NULL);
 673                 return;
 674         }
 675
 676         lamt += amount;
 677         if (lamt < thresh)
 678                 return;
 679
 680         gettimeofday(&bwend, NULL);
 681         timersub(&bwend, &bwstart, &bwend);
 682         if (!timerisset(&bwend))
 683                 return;
 684
 685         lamt *= 8;
 686         waitlen = (double)1000000L * lamt / limit_rate;
 687
 688         bwstart.tv_sec = waitlen / 1000000L;
 689         bwstart.tv_usec = waitlen % 1000000L;
 690
 691         if (timercmp(&bwstart, &bwend, >)) {
 692                 timersub(&bwstart, &bwend, &bwend);
 693
 694                 /* Adjust the wait time */
 695                 if (bwend.tv_sec) {
 696                         thresh /= 2;
 697                         if (thresh < 2048)
 698                                 thresh = 2048;
 699                 } else if (bwend.tv_usec < 100) {
 700                         thresh *= 2;
 701                         if (thresh > 32768)
 702                                 thresh = 32768;
 703                 }
 704
 705                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 706                 while (nanosleep(&ts, &rm) == -1) {
 707                         if (errno != EINTR)
 708                                 break;
 709                         ts = rm;
 710                 }
 711         }
 712
 713         lamt = 0;
 714         gettimeofday(&bwstart, NULL);
 715 }
 716
 717 void
 718 sink(int argc, char **argv)
 719 {
 720         static BUF buffer;
 721         struct stat stb;
 722         enum {
 723                 YES, NO, DISPLAYED
 724         } wrerr;
 725         BUF *bp;
 726         off_t i;
 727         size_t j, count;
 728         int amt, exists, first, mask, mode, ofd, omode;
 729         off_t size, statbytes;
 730         int setimes, targisdir, wrerrno = 0;
 731         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 732         struct timeval tv[2];
 733
 734 #define atime   tv[0]
 735 #define mtime   tv[1]
 736 #define SCREWUP(str)    { why = str; goto screwup; }
 737
 738         setimes = targisdir = 0;
 739         mask = umask(0);
 740         if (!pflag)
 741                 (void) umask(mask);
 742         if (argc != 1) {
 743                 run_err("ambiguous target");
 744                 exit(1);
 745         }
 746         targ = *argv;
 747         if (targetshouldbedirectory)
 748                 verifydir(targ);
 749
 750         (void) atomicio(vwrite, remout, "", 1);
 751         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 752                 targisdir = 1;
 753         for (first = 1;; first = 0) {
 754                 cp = buf;
 755                 if (atomicio(read, remin, cp, 1) != 1)
 756                         return;
 757                 if (*cp++ == '\n')
 758                         SCREWUP("unexpected <newline>");
 759                 do {
 760                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 761                                 SCREWUP("lost connection");
 762                         *cp++ = ch;
 763                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 764                 *cp = 0;
 765                 if (verbose_mode)
 766                         fprintf(stderr, "Sink: %s", buf);
 767
 768                 if (buf[0] == '\01' || buf[0] == '\02') {
 769                         if (iamremote == 0)
 770                                 (void) atomicio(vwrite, STDERR_FILENO,
 771                                     buf + 1, strlen(buf + 1));
 772                         if (buf[0] == '\02')
 773                                 exit(1);
 774                         ++errs;
 775                         continue;
 776                 }
 777                 if (buf[0] == 'E') {
 778                         (void) atomicio(vwrite, remout, "", 1);
 779                         return;
 780                 }
 781                 if (ch == '\n')
 782                         *--cp = 0;
 783
 784                 cp = buf;
 785                 if (*cp == 'T') {
 786                         setimes++;
 787                         cp++;
 788                         mtime.tv_sec = strtol(cp, &cp, 10);
 789                         if (!cp || *cp++ != ' ')
 790                                 SCREWUP("mtime.sec not delimited");
 791                         mtime.tv_usec = strtol(cp, &cp, 10);
 792                         if (!cp || *cp++ != ' ')
 793                                 SCREWUP("mtime.usec not delimited");
 794                         atime.tv_sec = strtol(cp, &cp, 10);
 795                         if (!cp || *cp++ != ' ')
 796                                 SCREWUP("atime.sec not delimited");
 797                         atime.tv_usec = strtol(cp, &cp, 10);
 798                         if (!cp || *cp++ != '\0')
 799                                 SCREWUP("atime.usec not delimited");
 800                         (void) atomicio(vwrite, remout, "", 1);
 801                         continue;
 802                 }
 803                 if (*cp != 'C' && *cp != 'D') {
 804                         /*
 805                          * Check for the case "rcp remote:foo\* local:bar".
 806                          * In this case, the line "No match." can be returned
 807                          * by the shell before the rcp command on the remote is
 808                          * executed so the ^Aerror_message convention isn't
 809                          * followed.
 810                          */
 811                         if (first) {
 812                                 run_err("%s", cp);
 813                                 exit(1);
 814                         }
 815                         SCREWUP("expected control record");
 816                 }
 817                 mode = 0;
 818                 for (++cp; cp < buf + 5; cp++) {
 819                         if (*cp < '0' || *cp > '7')
 820                                 SCREWUP("bad mode");
 821                         mode = (mode << 3) | (*cp - '0');
 822                 }
 823                 if (*cp++ != ' ')
 824                         SCREWUP("mode not delimited");
 825
 826                 for (size = 0; isdigit(*cp);)
 827                         size = size * 10 + (*cp++ - '0');
 828                 if (*cp++ != ' ')
 829                         SCREWUP("size not delimited");
 830                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 831                         run_err("error: unexpected filename: %s", cp);
 832                         exit(1);
 833                 }
 834                 if (targisdir) {
 835                         static char *namebuf;
 836                         static size_t cursize;
 837                         size_t need;
 838
 839                         need = strlen(targ) + strlen(cp) + 250;
 840                         if (need > cursize) {
 841                                 if (namebuf)
 842                                         xfree(namebuf);
 843                                 namebuf = xmalloc(need);
 844                                 cursize = need;
 845                         }
 846                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 847                             strcmp(targ, "/") ? "/" : "", cp);
 848                         np = namebuf;
 849                 } else
 850                         np = targ;
 851                 curfile = cp;
 852                 exists = stat(np, &stb) == 0;
 853                 if (buf[0] == 'D') {
 854                         int mod_flag = pflag;
 855                         if (!iamrecursive)
 856                                 SCREWUP("received directory without -r");
 857                         if (exists) {
 858                                 if (!S_ISDIR(stb.st_mode)) {
 859                                         errno = ENOTDIR;
 860                                         goto bad;
 861                                 }
 862                                 if (pflag)
 863                                         (void) chmod(np, mode);
 864                         } else {
 865                                 /* Handle copying from a read-only
 866                                    directory */
 867                                 mod_flag = 1;
 868                                 if (mkdir(np, mode | S_IRWXU) < 0)
 869                                         goto bad;
 870                         }
 871                         vect[0] = xstrdup(np);
 872                         sink(1, vect);
 873                         if (setimes) {
 874                                 setimes = 0;
 875                                 if (utimes(vect[0], tv) < 0)
 876                                         run_err("%s: set times: %s",
 877                                             vect[0], strerror(errno));
 878                         }
 879                         if (mod_flag)
 880                                 (void) chmod(vect[0], mode);
 881                         if (vect[0])
 882                                 xfree(vect[0]);
 883                         continue;
 884                 }
 885                 omode = mode;
 886                 mode |= S_IWRITE;
 887                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 888 bad:                    run_err("%s: %s", np, strerror(errno));
 889                         continue;
 890                 }
 891                 (void) atomicio(vwrite, remout, "", 1);
 892                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 893                         (void) close(ofd);
 894                         continue;
 895                 }
 896                 cp = bp->buf;
 897                 wrerr = NO;
 898
 899                 statbytes = 0;
 900                 if (showprogress)
 901                         start_progress_meter(curfile, size, &statbytes);
 902                 for (count = i = 0; i < size; i += 4096) {
 903                         amt = 4096;
 904                         if (i + amt > size)
 905                                 amt = size - i;
 906                         count += amt;
 907                         do {
 908                                 j = atomicio(read, remin, cp, amt);
 909                                 if (j == 0) {
 910                                         run_err("%s", j ? strerror(errno) :
 911                                             "dropped connection");
 912                                         exit(1);
 913                                 }
 914                                 amt -= j;
 915                                 cp += j;
 916                                 statbytes += j;
 917                         } while (amt > 0);
 918
 919                         if (limit_rate)
 920                                 bwlimit(4096);
 921
 922                         if (count == bp->cnt) {
 923                                 /* Keep reading so we stay sync'd up. */
 924                                 if (wrerr == NO) {
 925                                         if (atomicio(vwrite, ofd, bp->buf,
 926                                             count) != count) {
 927                                                 wrerr = YES;
 928                                                 wrerrno = errno;
 929                                         }
 930                                 }
 931                                 count = 0;
 932                                 cp = bp->buf;
 933                         }
 934                 }
 935                 if (showprogress)
 936                         stop_progress_meter();
 937                 if (count != 0 && wrerr == NO &&
 938                     atomicio(vwrite, ofd, bp->buf, count) != count) {
 939                         wrerr = YES;
 940                         wrerrno = errno;
 941                 }
 942                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
 943                         run_err("%s: truncate: %s", np, strerror(errno));
 944                         wrerr = DISPLAYED;
 945                 }
 946                 if (pflag) {
 947                         if (exists || omode != mode)
 948 #ifdef HAVE_FCHMOD
 949                                 if (fchmod(ofd, omode)) {
 950 #else /* HAVE_FCHMOD */
 951                                 if (chmod(np, omode)) {
 952 #endif /* HAVE_FCHMOD */
 953                                         run_err("%s: set mode: %s",
 954                                             np, strerror(errno));
 955                                         wrerr = DISPLAYED;
 956                                 }
 957                 } else {
 958                         if (!exists && omode != mode)
 959 #ifdef HAVE_FCHMOD
 960                                 if (fchmod(ofd, omode & ~mask)) {
 961 #else /* HAVE_FCHMOD */
 962                                 if (chmod(np, omode & ~mask)) {
 963 #endif /* HAVE_FCHMOD */
 964                                         run_err("%s: set mode: %s",
 965                                             np, strerror(errno));
 966                                         wrerr = DISPLAYED;
 967                                 }
 968                 }
 969                 if (close(ofd) == -1) {
 970                         wrerr = YES;
 971                         wrerrno = errno;
 972                 }
 973                 (void) response();
 974                 if (setimes && wrerr == NO) {
 975                         setimes = 0;
 976                         if (utimes(np, tv) < 0) {
 977                                 run_err("%s: set times: %s",
 978                                     np, strerror(errno));
 979                                 wrerr = DISPLAYED;
 980                         }
 981                 }
 982                 switch (wrerr) {
 983                 case YES:
 984                         run_err("%s: %s", np, strerror(wrerrno));
 985                         break;
 986                 case NO:
 987                         (void) atomicio(vwrite, remout, "", 1);
 988                         break;
 989                 case DISPLAYED:
 990                         break;
 991                 }
 992         }
 993 screwup:
 994         run_err("protocol error: %s", why);
 995         exit(1);
 996 }
 997
 998 int
 999 response(void)
1000 {
1001         char ch, *cp, resp, rbuf[2048];
1002
1003         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1004                 lostconn(0);
1005
1006         cp = rbuf;
1007         switch (resp) {
1008         case 0:         /* ok */
1009                 return (0);
1010         default:
1011                 *cp++ = resp;
1012                 /* FALLTHROUGH */
1013         case 1:         /* error, followed by error msg */
1014         case 2:         /* fatal error, "" */
1015                 do {
1016                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1017                                 lostconn(0);
1018                         *cp++ = ch;
1019                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1020
1021                 if (!iamremote)
1022                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1023                 ++errs;
1024                 if (resp == 1)
1025                         return (-1);
1026                 exit(1);
1027         }
1028         /* NOTREACHED */
1029 }
1030
1031 void
1032 usage(void)
1033 {
1034         (void) fprintf(stderr,
1035             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1036             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1037             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1038         exit(1);
1039 }
1040
1041 void
1042 run_err(const char *fmt,...)
1043 {
1044         static FILE *fp;
1045         va_list ap;
1046
1047         ++errs;
1048         if (fp == NULL && !(fp = fdopen(remout, "w")))
1049                 return;
1050         (void) fprintf(fp, "%c", 0x01);
1051         (void) fprintf(fp, "scp: ");
1052         va_start(ap, fmt);
1053         (void) vfprintf(fp, fmt, ap);
1054         va_end(ap);
1055         (void) fprintf(fp, "\n");
1056         (void) fflush(fp);
1057
1058         if (!iamremote) {
1059                 va_start(ap, fmt);
1060                 vfprintf(stderr, fmt, ap);
1061                 va_end(ap);
1062                 fprintf(stderr, "\n");
1063         }
1064 }
1065
1066 void
1067 verifydir(char *cp)
1068 {
1069         struct stat stb;
1070
1071         if (!stat(cp, &stb)) {
1072                 if (S_ISDIR(stb.st_mode))
1073                         return;
1074                 errno = ENOTDIR;
1075         }
1076         run_err("%s: %s", cp, strerror(errno));
1077         killchild(0);
1078 }
1079
1080 int
1081 okname(char *cp0)
1082 {
1083         int c;
1084         char *cp;
1085
1086         cp = cp0;
1087         do {
1088                 c = (int)*cp;
1089                 if (c & 0200)
1090                         goto bad;
1091                 if (!isalpha(c) && !isdigit(c)) {
1092                         switch (c) {
1093                         case '\'':
1094                         case '"':
1095                         case '`':
1096                         case ' ':
1097                         case '#':
1098                                 goto bad;
1099                         default:
1100                                 break;
1101                         }
1102                 }
1103         } while (*++cp);
1104         return (1);
1105
1106 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1107         return (0);
1108 }
1109
1110 BUF *
1111 allocbuf(BUF *bp, int fd, int blksize)
1112 {
1113         size_t size;
1114 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1115         struct stat stb;
1116
1117         if (fstat(fd, &stb) < 0) {
1118                 run_err("fstat: %s", strerror(errno));
1119                 return (0);
1120         }
1121         size = roundup(stb.st_blksize, blksize);
1122         if (size == 0)
1123                 size = blksize;
1124 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1125         size = blksize;
1126 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1127         if (bp->cnt >= size)
1128                 return (bp);
1129         if (bp->buf == NULL)
1130                 bp->buf = xmalloc(size);
1131         else
1132                 bp->buf = xrealloc(bp->buf, size);
1133         memset(bp->buf, 0, size);
1134         bp->cnt = size;
1135         return (bp);
1136 }
1137
1138 void
1139 lostconn(int signo)
1140 {
1141         if (!iamremote)
1142                 write(STDERR_FILENO, "lost connection\n", 16);
1143         if (signo)
1144                 _exit(1);
1145         else
1146                 exit(1);
1147 }