release/src-rt-6.x.4708/router/dropbear/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 1.130 2006/01/31 10:35:43 djm Exp $");*/
  75
  76 #include "atomicio.h"
  77 #include "compat.h"
  78 #include "scpmisc.h"
  79 #include "progressmeter.h"
  80
  81 void bwlimit(int);
  82
  83 /* Struct for addargs */
  84 arglist args;
  85
  86 /* Bandwidth limit */
  87 off_t limit_rate = 0;
  88
  89 /* Name of current file being transferred. */
  90 char *curfile;
  91
  92 /* This is set to non-zero to enable verbose mode. */
  93 int verbose_mode = 0;
  94
  95 /* This is set to zero if the progressmeter is not desired. */
  96 int showprogress = 1;
  97
  98 /* This is the program to execute for the secured connection. ("ssh" or -S) */
  99 char *ssh_program = _PATH_SSH_PROGRAM;
 100
 101 /* This is used to store the pid of ssh_program */
 102 pid_t do_cmd_pid = -1;
 103
 104 static void
 105 killchild(int signo)
 106 {
 107         if (do_cmd_pid > 1) {
 108                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 109                 waitpid(do_cmd_pid, NULL, 0);
 110         }
 111
 112         if (signo)
 113                 _exit(1);
 114         exit(1);
 115 }
 116
 117 static int
 118 do_local_cmd(arglist *a)
 119 {
 120         u_int i;
 121         int status;
 122         pid_t pid;
 123
 124         if (a->num == 0)
 125                 fatal("do_local_cmd: no arguments");
 126
 127         if (verbose_mode) {
 128                 fprintf(stderr, "Executing:");
 129                 for (i = 0; i < a->num; i++)
 130                         fprintf(stderr, " %s", a->list[i]);
 131                 fprintf(stderr, "\n");
 132         }
 133 #ifdef USE_VFORK
 134         pid = vfork();
 135 #else
 136         pid = fork();
 137 #endif
 138         if (pid == -1)
 139                 fatal("do_local_cmd: fork: %s", strerror(errno));
 140
 141         if (pid == 0) {
 142                 execvp(a->list[0], a->list);
 143                 perror(a->list[0]);
 144 #ifdef USE_VFORK
 145                 _exit(1);
 146 #else
 147                 exit(1);
 148 #endif
 149         }
 150
 151         do_cmd_pid = pid;
 152         signal(SIGTERM, killchild);
 153         signal(SIGINT, killchild);
 154         signal(SIGHUP, killchild);
 155
 156         while (waitpid(pid, &status, 0) == -1)
 157                 if (errno != EINTR)
 158                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 159
 160         do_cmd_pid = -1;
 161
 162         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 163                 return (-1);
 164
 165         return (0);
 166 }
 167
 168 /*
 169  * This function executes the given command as the specified user on the
 170  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 171  * assigns the input and output file descriptors on success.
 172  */
 173
 174 static void
 175 arg_setup(char *host, char *remuser, char *cmd)
 176 {
 177         replacearg(&args, 0, "%s", ssh_program);
 178         if (remuser != NULL)
 179                 addargs(&args, "-l%s", remuser);
 180         addargs(&args, "%s", host);
 181         addargs(&args, "%s", cmd);
 182 }
 183
 184 int
 185 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
 186 {
 187         int pin[2], pout[2], reserved[2];
 188
 189         if (verbose_mode)
 190                 fprintf(stderr,
 191                     "Executing: program %s host %s, user %s, command %s\n",
 192                     ssh_program, host,
 193                     remuser ? remuser : "(unspecified)", cmd);
 194
 195         /*
 196          * Reserve two descriptors so that the real pipes won't get
 197          * descriptors 0 and 1 because that will screw up dup2 below.
 198          */
 199         pipe(reserved);
 200
 201         /* Create a socket pair for communicating with ssh. */
 202         if (pipe(pin) < 0)
 203                 fatal("pipe: %s", strerror(errno));
 204         if (pipe(pout) < 0)
 205                 fatal("pipe: %s", strerror(errno));
 206
 207         /* Free the reserved descriptors. */
 208         close(reserved[0]);
 209         close(reserved[1]);
 210
 211         /* uClinux needs to build the args here before vforking,
 212            otherwise we do it later on. */
 213 #ifdef USE_VFORK
 214         arg_setup(host, remuser, cmd);
 215 #endif
 216
 217         /* Fork a child to execute the command on the remote host using ssh. */
 218 #ifdef USE_VFORK
 219         do_cmd_pid = vfork();
 220 #else
 221         do_cmd_pid = fork();
 222 #endif
 223
 224         if (do_cmd_pid == 0) {
 225                 /* Child. */
 226                 close(pin[1]);
 227                 close(pout[0]);
 228                 dup2(pin[0], 0);
 229                 dup2(pout[1], 1);
 230                 close(pin[0]);
 231                 close(pout[1]);
 232
 233 #ifndef USE_VFORK
 234                 arg_setup(host, remuser, cmd);
 235 #endif
 236
 237                 execvp(ssh_program, args.list);
 238                 perror(ssh_program);
 239 #ifdef USE_VFORK
 240                 _exit(1);
 241 #else
 242                 exit(1);
 243 #endif
 244         } else if (do_cmd_pid == -1) {
 245                 fatal("fork: %s", strerror(errno));
 246         }
 247
 248 #ifdef USE_VFORK
 249         /* clean up command */
 250         /* pop cmd */
 251         xfree(args.list[args.num-1]);
 252         args.list[args.num-1]=NULL;
 253         args.num--;
 254         /* pop host */
 255         xfree(args.list[args.num-1]);
 256         args.list[args.num-1]=NULL;
 257         args.num--;
 258         /* pop user */
 259         if (remuser != NULL) {
 260                 xfree(args.list[args.num-1]);
 261                 args.list[args.num-1]=NULL;
 262                 args.num--;
 263         }
 264 #endif
 265
 266         /* Parent.  Close the other side, and return the local side. */
 267         close(pin[0]);
 268         *fdout = pin[1];
 269         close(pout[1]);
 270         *fdin = pout[0];
 271         signal(SIGTERM, killchild);
 272         signal(SIGINT, killchild);
 273         signal(SIGHUP, killchild);
 274         return 0;
 275 }
 276
 277 typedef struct {
 278         size_t cnt;
 279         char *buf;
 280 } BUF;
 281
 282 BUF *allocbuf(BUF *, int, int);
 283 void lostconn(int);
 284 void nospace(void);
 285 int okname(char *);
 286 void run_err(const char *,...);
 287 void verifydir(char *);
 288
 289 struct passwd *pwd;
 290 uid_t userid;
 291 int errs, remin, remout;
 292 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 293
 294 #define CMDNEEDS        64
 295 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 296
 297 int response(void);
 298 void rsource(char *, struct stat *);
 299 void sink(int, char *[]);
 300 void source(int, char *[]);
 301 void tolocal(int, char *[]);
 302 void toremote(char *, int, char *[]);
 303 void usage(void);
 304
 305 #if defined(DBMULTI_scp) || !defined(DROPBEAR_MULTI)
 306 #if defined(DBMULTI_scp) && defined(DROPBEAR_MULTI)
 307 int scp_main(int argc, char **argv)
 308 #else
 309 int
 310 main(int argc, char **argv)
 311 #endif
 312 {
 313         int ch, fflag, tflag, status;
 314         double speed;
 315         char *targ, *endp;
 316         extern char *optarg;
 317         extern int optind;
 318
 319         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 320         sanitise_stdfd();
 321
 322         memset(&args, '\0', sizeof(args));
 323         args.list = NULL;
 324         addargs(&args, "%s", ssh_program);
 325
 326         fflag = tflag = 0;
 327         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 328                 switch (ch) {
 329                 /* User-visible flags. */
 330                 case '1':
 331                 case '2':
 332                 case '4':
 333                 case '6':
 334                 case 'C':
 335                         addargs(&args, "-%c", ch);
 336                         break;
 337                 case 'o':
 338                 case 'c':
 339                 case 'i':
 340                 case 'F':
 341                         addargs(&args, "-%c%s", ch, optarg);
 342                         break;
 343                 case 'P':
 344                         addargs(&args, "-p%s", optarg);
 345                         break;
 346                 case 'B':
 347                         fprintf(stderr, "Note: -B option is disabled in this version of scp");
 348                         break;
 349                 case 'l':
 350                         speed = strtod(optarg, &endp);
 351                         if (speed <= 0 || *endp != '\0')
 352                                 usage();
 353                         limit_rate = speed * 1024;
 354                         break;
 355                 case 'p':
 356                         pflag = 1;
 357                         break;
 358                 case 'r':
 359                         iamrecursive = 1;
 360                         break;
 361                 case 'S':
 362                         ssh_program = xstrdup(optarg);
 363                         break;
 364                 case 'v':
 365                         addargs(&args, "-v");
 366                         verbose_mode = 1;
 367                         break;
 368                 case 'q':
 369 #ifdef PROGRESS_METER
 370                         addargs(&args, "-q");
 371                         showprogress = 0;
 372 #endif
 373                         break;
 374
 375                 /* Server options. */
 376                 case 'd':
 377                         targetshouldbedirectory = 1;
 378                         break;
 379                 case 'f':       /* "from" */
 380                         iamremote = 1;
 381                         fflag = 1;
 382                         break;
 383                 case 't':       /* "to" */
 384                         iamremote = 1;
 385                         tflag = 1;
 386 #ifdef HAVE_CYGWIN
 387                         setmode(0, O_BINARY);
 388 #endif
 389                         break;
 390                 default:
 391                         usage();
 392                 }
 393         argc -= optind;
 394         argv += optind;
 395
 396         if ((pwd = getpwuid(userid = getuid())) == NULL)
 397                 fatal("unknown user %u", (u_int) userid);
 398
 399         if (!isatty(STDERR_FILENO))
 400                 showprogress = 0;
 401
 402         remin = STDIN_FILENO;
 403         remout = STDOUT_FILENO;
 404
 405         if (fflag) {
 406                 /* Follow "protocol", send data. */
 407                 (void) response();
 408                 source(argc, argv);
 409                 exit(errs != 0);
 410         }
 411         if (tflag) {
 412                 /* Receive data. */
 413                 sink(argc, argv);
 414                 exit(errs != 0);
 415         }
 416         if (argc < 2)
 417                 usage();
 418         if (argc > 2)
 419                 targetshouldbedirectory = 1;
 420
 421         remin = remout = -1;
 422         do_cmd_pid = -1;
 423         /* Command to be executed on remote system using "ssh". */
 424         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 425             verbose_mode ? " -v" : "",
 426             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 427             targetshouldbedirectory ? " -d" : "");
 428
 429         (void) signal(SIGPIPE, lostconn);
 430
 431         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 432                 toremote(targ, argc, argv);
 433         else {
 434                 if (targetshouldbedirectory)
 435                         verifydir(argv[argc - 1]);
 436                 tolocal(argc, argv);    /* Dest is local host. */
 437         }
 438         /*
 439          * Finally check the exit status of the ssh process, if one was forked
 440          * and no error has occured yet
 441          */
 442         if (do_cmd_pid != -1 && errs == 0) {
 443                 if (remin != -1)
 444                     (void) close(remin);
 445                 if (remout != -1)
 446                     (void) close(remout);
 447                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 448                         errs = 1;
 449                 else {
 450                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 451                                 errs = 1;
 452                 }
 453         }
 454         exit(errs != 0);
 455 }
 456 #endif /* DBMULTI_scp stuff */
 457
 458 void
 459 toremote(char *targ, int argc, char **argv)
 460 {
 461         int i, len;
 462         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 463         arglist alist;
 464
 465         memset(&alist, '\0', sizeof(alist));
 466         alist.list = NULL;
 467
 468         *targ++ = 0;
 469         if (*targ == 0)
 470                 targ = ".";
 471
 472         arg = xstrdup(argv[argc - 1]);
 473         if ((thost = strrchr(arg, '@'))) {
 474                 /* user@host */
 475                 *thost++ = 0;
 476                 tuser = arg;
 477                 if (*tuser == '\0')
 478                         tuser = NULL;
 479         } else {
 480                 thost = arg;
 481                 tuser = NULL;
 482         }
 483
 484         if (tuser != NULL && !okname(tuser)) {
 485                 xfree(arg);
 486                 return;
 487         }
 488
 489         for (i = 0; i < argc - 1; i++) {
 490                 src = colon(argv[i]);
 491                 if (src) {      /* remote to remote */
 492                         freeargs(&alist);
 493                         addargs(&alist, "%s", ssh_program);
 494                         if (verbose_mode)
 495                                 addargs(&alist, "-v");
 496 #if 0
 497                         /* Disabled since dbclient won't understand them
 498                            and scp works fine without them. */
 499                         addargs(&alist, "-x");
 500                         addargs(&alist, "-oClearAllForwardings yes");
 501                         addargs(&alist, "-n");
 502 #endif
 503
 504                         *src++ = 0;
 505                         if (*src == 0)
 506                                 src = ".";
 507                         host = strrchr(argv[i], '@');
 508
 509                         if (host) {
 510                                 *host++ = 0;
 511                                 host = cleanhostname(host);
 512                                 suser = argv[i];
 513                                 if (*suser == '\0')
 514                                         suser = pwd->pw_name;
 515                                 else if (!okname(suser))
 516                                         continue;
 517                                 addargs(&alist, "-l");
 518                                 addargs(&alist, "%s", suser);
 519                         } else {
 520                                 host = cleanhostname(argv[i]);
 521                         }
 522                         addargs(&alist, "%s", host);
 523                         addargs(&alist, "%s", cmd);
 524                         addargs(&alist, "%s", src);
 525                         addargs(&alist, "%s%s%s:%s",
 526                             tuser ? tuser : "", tuser ? "@" : "",
 527                             thost, targ);
 528                         if (do_local_cmd(&alist) != 0)
 529                                 errs = 1;
 530                 } else {        /* local to remote */
 531                         if (remin == -1) {
 532                                 len = strlen(targ) + CMDNEEDS + 20;
 533                                 bp = xmalloc(len);
 534                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
 535                                 host = cleanhostname(thost);
 536                                 if (do_cmd(host, tuser, bp, &remin,
 537                                     &remout, argc) < 0)
 538                                         exit(1);
 539                                 if (response() < 0)
 540                                         exit(1);
 541                                 (void) xfree(bp);
 542                         }
 543                         source(1, argv + i);
 544                 }
 545         }
 546 }
 547
 548 void
 549 tolocal(int argc, char **argv)
 550 {
 551         int i, len;
 552         char *bp, *host, *src, *suser;
 553         arglist alist;
 554
 555         memset(&alist, '\0', sizeof(alist));
 556         alist.list = NULL;
 557
 558         for (i = 0; i < argc - 1; i++) {
 559                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 560                         freeargs(&alist);
 561                         addargs(&alist, "%s", _PATH_CP);
 562                         if (iamrecursive)
 563                                 addargs(&alist, "-r");
 564                         if (pflag)
 565                                 addargs(&alist, "-p");
 566                         addargs(&alist, "%s", argv[i]);
 567                         addargs(&alist, "%s", argv[argc-1]);
 568                         if (do_local_cmd(&alist))
 569                                 ++errs;
 570                         continue;
 571                 }
 572                 *src++ = 0;
 573                 if (*src == 0)
 574                         src = ".";
 575                 if ((host = strrchr(argv[i], '@')) == NULL) {
 576                         host = argv[i];
 577                         suser = NULL;
 578                 } else {
 579                         *host++ = 0;
 580                         suser = argv[i];
 581                         if (*suser == '\0')
 582                                 suser = pwd->pw_name;
 583                 }
 584                 host = cleanhostname(host);
 585                 len = strlen(src) + CMDNEEDS + 20;
 586                 bp = xmalloc(len);
 587                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
 588                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
 589                         (void) xfree(bp);
 590                         ++errs;
 591                         continue;
 592                 }
 593                 xfree(bp);
 594                 sink(1, argv + argc - 1);
 595                 (void) close(remin);
 596                 remin = remout = -1;
 597         }
 598 }
 599
 600 void
 601 source(int argc, char **argv)
 602 {
 603         struct stat stb;
 604         static BUF buffer;
 605         BUF *bp;
 606         off_t i, amt, statbytes;
 607         size_t result;
 608         int fd = -1, haderr, indx;
 609         char *last, *name, buf[2048];
 610         int len;
 611
 612         for (indx = 0; indx < argc; ++indx) {
 613                 name = argv[indx];
 614                 statbytes = 0;
 615                 len = strlen(name);
 616                 while (len > 1 && name[len-1] == '/')
 617                         name[--len] = '\0';
 618                 if (strchr(name, '\n') != NULL) {
 619                         run_err("%s: skipping, filename contains a newline",
 620                             name);
 621                         goto next;
 622                 }
 623                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 624                         goto syserr;
 625                 if (fstat(fd, &stb) < 0) {
 626 syserr:                 run_err("%s: %s", name, strerror(errno));
 627                         goto next;
 628                 }
 629                 switch (stb.st_mode & S_IFMT) {
 630                 case S_IFREG:
 631                         break;
 632                 case S_IFDIR:
 633                         if (iamrecursive) {
 634                                 rsource(name, &stb);
 635                                 goto next;
 636                         }
 637                         /* FALLTHROUGH */
 638                 default:
 639                         run_err("%s: not a regular file", name);
 640                         goto next;
 641                 }
 642                 if ((last = strrchr(name, '/')) == NULL)
 643                         last = name;
 644                 else
 645                         ++last;
 646                 curfile = last;
 647                 if (pflag) {
 648                         /*
 649                          * Make it compatible with possible future
 650                          * versions expecting microseconds.
 651                          */
 652                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 653                             (u_long) stb.st_mtime,
 654                             (u_long) stb.st_atime);
 655                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 656                         if (response() < 0)
 657                                 goto next;
 658                 }
 659 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 660                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 661                     (u_int) (stb.st_mode & FILEMODEMASK),
 662                     (long long)stb.st_size, last);
 663                 if (verbose_mode) {
 664                         fprintf(stderr, "Sending file modes: %s", buf);
 665                 }
 666                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 667                 if (response() < 0)
 668                         goto next;
 669                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 670 next:                   if (fd != -1) {
 671                                 (void) close(fd);
 672                                 fd = -1;
 673                         }
 674                         continue;
 675                 }
 676 #if PROGRESS_METER
 677                 if (showprogress)
 678                         start_progress_meter(curfile, stb.st_size, &statbytes);
 679 #endif
 680                 /* Keep writing after an error so that we stay sync'd up. */
 681                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 682                         amt = bp->cnt;
 683                         if (i + amt > stb.st_size)
 684                                 amt = stb.st_size - i;
 685                         if (!haderr) {
 686                                 result = atomicio(read, fd, bp->buf, amt);
 687                                 if (result != amt)
 688                                         haderr = errno;
 689                         }
 690                         if (haderr)
 691                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 692                         else {
 693                                 result = atomicio(vwrite, remout, bp->buf, amt);
 694                                 if (result != amt)
 695                                         haderr = errno;
 696                                 statbytes += result;
 697                         }
 698                         if (limit_rate)
 699                                 bwlimit(amt);
 700                 }
 701 #ifdef PROGRESS_METER
 702                 if (showprogress)
 703                         stop_progress_meter();
 704 #endif
 705
 706                 if (fd != -1) {
 707                         if (close(fd) < 0 && !haderr)
 708                                 haderr = errno;
 709                         fd = -1;
 710                 }
 711                 if (!haderr)
 712                         (void) atomicio(vwrite, remout, "", 1);
 713                 else
 714                         run_err("%s: %s", name, strerror(haderr));
 715                 (void) response();
 716         }
 717 }
 718
 719 void
 720 rsource(char *name, struct stat *statp)
 721 {
 722         DIR *dirp;
 723         struct dirent *dp;
 724         char *last, *vect[1], path[1100];
 725
 726         if (!(dirp = opendir(name))) {
 727                 run_err("%s: %s", name, strerror(errno));
 728                 return;
 729         }
 730         last = strrchr(name, '/');
 731         if (last == 0)
 732                 last = name;
 733         else
 734                 last++;
 735         if (pflag) {
 736                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 737                     (u_long) statp->st_mtime,
 738                     (u_long) statp->st_atime);
 739                 (void) atomicio(vwrite, remout, path, strlen(path));
 740                 if (response() < 0) {
 741                         closedir(dirp);
 742                         return;
 743                 }
 744         }
 745         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 746             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 747         if (verbose_mode)
 748                 fprintf(stderr, "Entering directory: %s", path);
 749         (void) atomicio(vwrite, remout, path, strlen(path));
 750         if (response() < 0) {
 751                 closedir(dirp);
 752                 return;
 753         }
 754         while ((dp = readdir(dirp)) != NULL) {
 755                 if (dp->d_ino == 0)
 756                         continue;
 757                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 758                         continue;
 759                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 760                         run_err("%s/%s: name too long", name, dp->d_name);
 761                         continue;
 762                 }
 763                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 764                 vect[0] = path;
 765                 source(1, vect);
 766         }
 767         (void) closedir(dirp);
 768         (void) atomicio(vwrite, remout, "E\n", 2);
 769         (void) response();
 770 }
 771
 772 void
 773 bwlimit(int amount)
 774 {
 775         static struct timeval bwstart, bwend;
 776         static int lamt, thresh = 16384;
 777         uint64_t waitlen;
 778         struct timespec ts, rm;
 779
 780         if (!timerisset(&bwstart)) {
 781                 gettimeofday(&bwstart, NULL);
 782                 return;
 783         }
 784
 785         lamt += amount;
 786         if (lamt < thresh)
 787                 return;
 788
 789         gettimeofday(&bwend, NULL);
 790         timersub(&bwend, &bwstart, &bwend);
 791         if (!timerisset(&bwend))
 792                 return;
 793
 794         lamt *= 8;
 795         waitlen = (double)1000000L * lamt / limit_rate;
 796
 797         bwstart.tv_sec = waitlen / 1000000L;
 798         bwstart.tv_usec = waitlen % 1000000L;
 799
 800         if (timercmp(&bwstart, &bwend, >)) {
 801                 timersub(&bwstart, &bwend, &bwend);
 802
 803                 /* Adjust the wait time */
 804                 if (bwend.tv_sec) {
 805                         thresh /= 2;
 806                         if (thresh < 2048)
 807                                 thresh = 2048;
 808                 } else if (bwend.tv_usec < 100) {
 809                         thresh *= 2;
 810                         if (thresh > 32768)
 811                                 thresh = 32768;
 812                 }
 813
 814                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 815                 while (nanosleep(&ts, &rm) == -1) {
 816                         if (errno != EINTR)
 817                                 break;
 818                         ts = rm;
 819                 }
 820         }
 821
 822         lamt = 0;
 823         gettimeofday(&bwstart, NULL);
 824 }
 825
 826 void
 827 sink(int argc, char **argv)
 828 {
 829         static BUF buffer;
 830         struct stat stb;
 831         enum {
 832                 YES, NO, DISPLAYED
 833         } wrerr;
 834         BUF *bp;
 835         off_t i;
 836         size_t j, count;
 837         int amt, exists, first, mask, mode, ofd, omode;
 838         off_t size, statbytes;
 839         int setimes, targisdir, wrerrno = 0;
 840         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 841         struct timeval tv[2];
 842
 843 #define atime   tv[0]
 844 #define mtime   tv[1]
 845 #define SCREWUP(str)    { why = str; goto screwup; }
 846
 847         setimes = targisdir = 0;
 848         mask = umask(0);
 849         if (!pflag)
 850                 (void) umask(mask);
 851         if (argc != 1) {
 852                 run_err("ambiguous target");
 853                 exit(1);
 854         }
 855         targ = *argv;
 856         if (targetshouldbedirectory)
 857                 verifydir(targ);
 858
 859         (void) atomicio(vwrite, remout, "", 1);
 860         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 861                 targisdir = 1;
 862         for (first = 1;; first = 0) {
 863                 cp = buf;
 864                 if (atomicio(read, remin, cp, 1) != 1)
 865                         return;
 866                 if (*cp++ == '\n')
 867                         SCREWUP("unexpected <newline>");
 868                 do {
 869                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 870                                 SCREWUP("lost connection");
 871                         *cp++ = ch;
 872                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 873                 *cp = 0;
 874                 if (verbose_mode)
 875                         fprintf(stderr, "Sink: %s", buf);
 876
 877                 if (buf[0] == '\01' || buf[0] == '\02') {
 878                         if (iamremote == 0)
 879                                 (void) atomicio(vwrite, STDERR_FILENO,
 880                                     buf + 1, strlen(buf + 1));
 881                         if (buf[0] == '\02')
 882                                 exit(1);
 883                         ++errs;
 884                         continue;
 885                 }
 886                 if (buf[0] == 'E') {
 887                         (void) atomicio(vwrite, remout, "", 1);
 888                         return;
 889                 }
 890                 if (ch == '\n')
 891                         *--cp = 0;
 892
 893                 cp = buf;
 894                 if (*cp == 'T') {
 895                         setimes++;
 896                         cp++;
 897                         mtime.tv_sec = strtol(cp, &cp, 10);
 898                         if (!cp || *cp++ != ' ')
 899                                 SCREWUP("mtime.sec not delimited");
 900                         mtime.tv_usec = strtol(cp, &cp, 10);
 901                         if (!cp || *cp++ != ' ')
 902                                 SCREWUP("mtime.usec not delimited");
 903                         atime.tv_sec = strtol(cp, &cp, 10);
 904                         if (!cp || *cp++ != ' ')
 905                                 SCREWUP("atime.sec not delimited");
 906                         atime.tv_usec = strtol(cp, &cp, 10);
 907                         if (!cp || *cp++ != '\0')
 908                                 SCREWUP("atime.usec not delimited");
 909                         (void) atomicio(vwrite, remout, "", 1);
 910                         continue;
 911                 }
 912                 if (*cp != 'C' && *cp != 'D') {
 913                         /*
 914                          * Check for the case "rcp remote:foo\* local:bar".
 915                          * In this case, the line "No match." can be returned
 916                          * by the shell before the rcp command on the remote is
 917                          * executed so the ^Aerror_message convention isn't
 918                          * followed.
 919                          */
 920                         if (first) {
 921                                 run_err("%s", cp);
 922                                 exit(1);
 923                         }
 924                         SCREWUP("expected control record");
 925                 }
 926                 mode = 0;
 927                 for (++cp; cp < buf + 5; cp++) {
 928                         if (*cp < '0' || *cp > '7')
 929                                 SCREWUP("bad mode");
 930                         mode = (mode << 3) | (*cp - '0');
 931                 }
 932                 if (*cp++ != ' ')
 933                         SCREWUP("mode not delimited");
 934
 935                 for (size = 0; isdigit(*cp);)
 936                         size = size * 10 + (*cp++ - '0');
 937                 if (*cp++ != ' ')
 938                         SCREWUP("size not delimited");
 939                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 940                         run_err("error: unexpected filename: %s", cp);
 941                         exit(1);
 942                 }
 943                 if (targisdir) {
 944                         static char *namebuf;
 945                         static size_t cursize;
 946                         size_t need;
 947
 948                         need = strlen(targ) + strlen(cp) + 250;
 949                         if (need > cursize) {
 950                                 if (namebuf)
 951                                         xfree(namebuf);
 952                                 namebuf = xmalloc(need);
 953                                 cursize = need;
 954                         }
 955                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 956                             strcmp(targ, "/") ? "/" : "", cp);
 957                         np = namebuf;
 958                 } else
 959                         np = targ;
 960                 curfile = cp;
 961                 exists = stat(np, &stb) == 0;
 962                 if (buf[0] == 'D') {
 963                         int mod_flag = pflag;
 964                         if (!iamrecursive)
 965                                 SCREWUP("received directory without -r");
 966                         if (exists) {
 967                                 if (!S_ISDIR(stb.st_mode)) {
 968                                         errno = ENOTDIR;
 969                                         goto bad;
 970                                 }
 971                                 if (pflag)
 972                                         (void) chmod(np, mode);
 973                         } else {
 974                                 /* Handle copying from a read-only
 975                                    directory */
 976                                 mod_flag = 1;
 977                                 if (mkdir(np, mode | S_IRWXU) < 0)
 978                                         goto bad;
 979                         }
 980                         vect[0] = xstrdup(np);
 981                         sink(1, vect);
 982                         if (setimes) {
 983                                 setimes = 0;
 984                                 if (utimes(vect[0], tv) < 0)
 985                                         run_err("%s: set times: %s",
 986                                             vect[0], strerror(errno));
 987                         }
 988                         if (mod_flag)
 989                                 (void) chmod(vect[0], mode);
 990                         if (vect[0])
 991                                 xfree(vect[0]);
 992                         continue;
 993                 }
 994                 omode = mode;
 995                 mode |= S_IWRITE;
 996                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 997 bad:                    run_err("%s: %s", np, strerror(errno));
 998                         continue;
 999                 }
1000                 (void) atomicio(vwrite, remout, "", 1);
1001                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
1002                         (void) close(ofd);
1003                         continue;
1004                 }
1005                 cp = bp->buf;
1006                 wrerr = NO;
1007
1008                 statbytes = 0;
1009 #ifdef PROGRESS_METER
1010                 if (showprogress)
1011                         start_progress_meter(curfile, size, &statbytes);
1012 #endif
1013                 for (count = i = 0; i < size; i += 4096) {
1014                         amt = 4096;
1015                         if (i + amt > size)
1016                                 amt = size - i;
1017                         count += amt;
1018                         do {
1019                                 j = atomicio(read, remin, cp, amt);
1020                                 if (j == 0) {
1021                                         run_err("%s", j ? strerror(errno) :
1022                                             "dropped connection");
1023                                         exit(1);
1024                                 }
1025                                 amt -= j;
1026                                 cp += j;
1027                                 statbytes += j;
1028                         } while (amt > 0);
1029
1030                         if (limit_rate)
1031                                 bwlimit(4096);
1032
1033                         if (count == bp->cnt) {
1034                                 /* Keep reading so we stay sync'd up. */
1035                                 if (wrerr == NO) {
1036                                         if (atomicio(vwrite, ofd, bp->buf,
1037                                             count) != count) {
1038                                                 wrerr = YES;
1039                                                 wrerrno = errno;
1040                                         }
1041                                 }
1042                                 count = 0;
1043                                 cp = bp->buf;
1044                         }
1045                 }
1046 #ifdef PROGRESS_METER
1047                 if (showprogress)
1048                         stop_progress_meter();
1049 #endif
1050                 if (count != 0 && wrerr == NO &&
1051                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1052                         wrerr = YES;
1053                         wrerrno = errno;
1054                 }
1055                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
1056                         run_err("%s: truncate: %s", np, strerror(errno));
1057                         wrerr = DISPLAYED;
1058                 }
1059                 if (pflag) {
1060                         if (exists || omode != mode)
1061 #ifdef HAVE_FCHMOD
1062                                 if (fchmod(ofd, omode)) {
1063 #else /* HAVE_FCHMOD */
1064                                 if (chmod(np, omode)) {
1065 #endif /* HAVE_FCHMOD */
1066                                         run_err("%s: set mode: %s",
1067                                             np, strerror(errno));
1068                                         wrerr = DISPLAYED;
1069                                 }
1070                 } else {
1071                         if (!exists && omode != mode)
1072 #ifdef HAVE_FCHMOD
1073                                 if (fchmod(ofd, omode & ~mask)) {
1074 #else /* HAVE_FCHMOD */
1075                                 if (chmod(np, omode & ~mask)) {
1076 #endif /* HAVE_FCHMOD */
1077                                         run_err("%s: set mode: %s",
1078                                             np, strerror(errno));
1079                                         wrerr = DISPLAYED;
1080                                 }
1081                 }
1082                 if (close(ofd) == -1) {
1083                         wrerr = YES;
1084                         wrerrno = errno;
1085                 }
1086                 (void) response();
1087                 if (setimes && wrerr == NO) {
1088                         setimes = 0;
1089                         if (utimes(np, tv) < 0) {
1090                                 run_err("%s: set times: %s",
1091                                     np, strerror(errno));
1092                                 wrerr = DISPLAYED;
1093                         }
1094                 }
1095                 switch (wrerr) {
1096                 case YES:
1097                         run_err("%s: %s", np, strerror(wrerrno));
1098                         break;
1099                 case NO:
1100                         (void) atomicio(vwrite, remout, "", 1);
1101                         break;
1102                 case DISPLAYED:
1103                         break;
1104                 }
1105         }
1106 screwup:
1107         run_err("protocol error: %s", why);
1108         exit(1);
1109 }
1110
1111 int
1112 response(void)
1113 {
1114         char ch, *cp, resp, rbuf[2048];
1115
1116         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1117                 lostconn(0);
1118
1119         cp = rbuf;
1120         switch (resp) {
1121         case 0:         /* ok */
1122                 return (0);
1123         default:
1124                 *cp++ = resp;
1125                 /* FALLTHROUGH */
1126         case 1:         /* error, followed by error msg */
1127         case 2:         /* fatal error, "" */
1128                 do {
1129                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1130                                 lostconn(0);
1131                         *cp++ = ch;
1132                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1133
1134                 if (!iamremote)
1135                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1136                 ++errs;
1137                 if (resp == 1)
1138                         return (-1);
1139                 exit(1);
1140         }
1141         /* NOTREACHED */
1142 }
1143
1144 void
1145 usage(void)
1146 {
1147         (void) fprintf(stderr,
1148             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1149             "           [-l limit] [-P port] [-S program]\n"
1150             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1151         exit(1);
1152 }
1153
1154 void
1155 run_err(const char *fmt,...)
1156 {
1157         static FILE *fp;
1158         va_list ap;
1159
1160         ++errs;
1161         if (fp == NULL && !(fp = fdopen(remout, "w")))
1162                 return;
1163         (void) fprintf(fp, "%c", 0x01);
1164         (void) fprintf(fp, "scp: ");
1165         va_start(ap, fmt);
1166         (void) vfprintf(fp, fmt, ap);
1167         va_end(ap);
1168         (void) fprintf(fp, "\n");
1169         (void) fflush(fp);
1170
1171         if (!iamremote) {
1172                 va_start(ap, fmt);
1173                 vfprintf(stderr, fmt, ap);
1174                 va_end(ap);
1175                 fprintf(stderr, "\n");
1176         }
1177 }
1178
1179 void
1180 verifydir(char *cp)
1181 {
1182         struct stat stb;
1183
1184         if (!stat(cp, &stb)) {
1185                 if (S_ISDIR(stb.st_mode))
1186                         return;
1187                 errno = ENOTDIR;
1188         }
1189         run_err("%s: %s", cp, strerror(errno));
1190         killchild(0);
1191 }
1192
1193 int
1194 okname(char *cp0)
1195 {
1196         int c;
1197         char *cp;
1198
1199         cp = cp0;
1200         do {
1201                 c = (int)*cp;
1202                 if (c & 0200)
1203                         goto bad;
1204                 if (!isalpha(c) && !isdigit(c)) {
1205                         switch (c) {
1206                         case '\'':
1207                         case '"':
1208                         case '`':
1209                         case ' ':
1210                         case '#':
1211                                 goto bad;
1212                         default:
1213                                 break;
1214                         }
1215                 }
1216         } while (*++cp);
1217         return (1);
1218
1219 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1220         return (0);
1221 }
1222
1223 BUF *
1224 allocbuf(BUF *bp, int fd, int blksize)
1225 {
1226         size_t size;
1227 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1228         struct stat stb;
1229
1230         if (fstat(fd, &stb) < 0) {
1231                 run_err("fstat: %s", strerror(errno));
1232                 return (0);
1233         }
1234         size = roundup(stb.st_blksize, blksize);
1235         if (size == 0)
1236                 size = blksize;
1237 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1238         size = blksize;
1239 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1240         if (bp->cnt >= size)
1241                 return (bp);
1242         if (bp->buf == NULL)
1243                 bp->buf = xmalloc(size);
1244         else
1245                 bp->buf = xrealloc(bp->buf, size);
1246         memset(bp->buf, 0, size);
1247         bp->cnt = size;
1248         return (bp);
1249 }
1250
1251 void
1252 lostconn(int signo)
1253 {
1254         if (!iamremote)
1255                 write(STDERR_FILENO, "lost connection\n", 16);
1256         if (signo)
1257                 _exit(1);
1258         else
1259                 exit(1);
1260 }