release/src/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 __uClinux__
 134         pid = vfork();
 135 #else
 136         pid = fork();
 137 #endif /* __uClinux__ */
 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 __uClinux__
 145                 _exit(1);
 146 #else
 147                 exit(1);
 148 #endif /* __uClinux__ */
 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 int
 175 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout, int argc)
 176 {
 177         int pin[2], pout[2], reserved[2];
 178
 179         if (verbose_mode)
 180                 fprintf(stderr,
 181                     "Executing: program %s host %s, user %s, command %s\n",
 182                     ssh_program, host,
 183                     remuser ? remuser : "(unspecified)", cmd);
 184
 185         /*
 186          * Reserve two descriptors so that the real pipes won't get
 187          * descriptors 0 and 1 because that will screw up dup2 below.
 188          */
 189         pipe(reserved);
 190
 191         /* Create a socket pair for communicating with ssh. */
 192         if (pipe(pin) < 0)
 193                 fatal("pipe: %s", strerror(errno));
 194         if (pipe(pout) < 0)
 195                 fatal("pipe: %s", strerror(errno));
 196
 197         /* Free the reserved descriptors. */
 198         close(reserved[0]);
 199         close(reserved[1]);
 200
 201     /* uClinux needs to build the args here before vforking,
 202        otherwise we do it later on. */
 203 #ifdef __uClinux__
 204                 replacearg(&args, 0, "%s", ssh_program);
 205                 if (remuser != NULL)
 206                         addargs(&args, "-l%s", remuser);
 207                 addargs(&args, "%s", host);
 208                 addargs(&args, "%s", cmd);
 209 #endif /* __uClinux__ */
 210
 211         /* Fork a child to execute the command on the remote host using ssh. */
 212 #ifdef __uClinux__
 213         do_cmd_pid = vfork();
 214 #else
 215         do_cmd_pid = fork();
 216 #endif /* __uClinux__ */
 217
 218         if (do_cmd_pid == 0) {
 219                 /* Child. */
 220                 close(pin[1]);
 221                 close(pout[0]);
 222                 dup2(pin[0], 0);
 223                 dup2(pout[1], 1);
 224                 close(pin[0]);
 225                 close(pout[1]);
 226
 227 #ifndef __uClinux__
 228                 replacearg(&args, 0, "%s", ssh_program);
 229                 if (remuser != NULL)
 230                         addargs(&args, "-l%s", remuser);
 231                 addargs(&args, "%s", host);
 232                 addargs(&args, "%s", cmd);
 233 #endif /* __uClinux__ */
 234
 235                 execvp(ssh_program, args.list);
 236                 perror(ssh_program);
 237 #ifndef __uClinux__
 238                 exit(1);
 239 #else
 240                 _exit(1);
 241 #endif /* __uClinux__ */
 242         } else if (do_cmd_pid == -1) {
 243                 fatal("fork: %s", strerror(errno));
 244         }
 245
 246
 247 #ifdef __uClinux__
 248         /* clean up command */
 249         /* pop cmd */
 250         xfree(args.list[args.num-1]);
 251         args.list[args.num-1]=NULL;
 252         args.num--;
 253         /* pop host */
 254         xfree(args.list[args.num-1]);
 255         args.list[args.num-1]=NULL;
 256         args.num--;
 257         /* pop user */
 258         if (remuser != NULL) {
 259                 xfree(args.list[args.num-1]);
 260                 args.list[args.num-1]=NULL;
 261                 args.num--;
 262         }
 263 #endif /* __uClinux__ */
 264
 265         /* Parent.  Close the other side, and return the local side. */
 266         close(pin[0]);
 267         *fdout = pin[1];
 268         close(pout[1]);
 269         *fdin = pout[0];
 270         signal(SIGTERM, killchild);
 271         signal(SIGINT, killchild);
 272         signal(SIGHUP, killchild);
 273         return 0;
 274 }
 275
 276 typedef struct {
 277         size_t cnt;
 278         char *buf;
 279 } BUF;
 280
 281 BUF *allocbuf(BUF *, int, int);
 282 void lostconn(int);
 283 void nospace(void);
 284 int okname(char *);
 285 void run_err(const char *,...);
 286 void verifydir(char *);
 287
 288 struct passwd *pwd;
 289 uid_t userid;
 290 int errs, remin, remout;
 291 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 292
 293 #define CMDNEEDS        64
 294 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 295
 296 int response(void);
 297 void rsource(char *, struct stat *);
 298 void sink(int, char *[]);
 299 void source(int, char *[]);
 300 void tolocal(int, char *[]);
 301 void toremote(char *, int, char *[]);
 302 void usage(void);
 303
 304 #if defined(DBMULTI_scp) || !defined(DROPBEAR_MULTI)
 305 #if defined(DBMULTI_scp) && defined(DROPBEAR_MULTI)
 306 int scp_main(int argc, char **argv)
 307 #else
 308 int
 309 main(int argc, char **argv)
 310 #endif
 311 {
 312         int ch, fflag, tflag, status;
 313         double speed;
 314         char *targ, *endp;
 315         extern char *optarg;
 316         extern int optind;
 317
 318         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 319         sanitise_stdfd();
 320
 321         memset(&args, '\0', sizeof(args));
 322         args.list = NULL;
 323         addargs(&args, "%s", ssh_program);
 324
 325         fflag = tflag = 0;
 326         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 327                 switch (ch) {
 328                 /* User-visible flags. */
 329                 case '1':
 330                 case '2':
 331                 case '4':
 332                 case '6':
 333                 case 'C':
 334                         addargs(&args, "-%c", ch);
 335                         break;
 336                 case 'o':
 337                 case 'c':
 338                 case 'i':
 339                 case 'F':
 340                         addargs(&args, "-%c%s", ch, optarg);
 341                         break;
 342                 case 'P':
 343                         addargs(&args, "-p%s", optarg);
 344                         break;
 345                 case 'B':
 346                         addargs(&args, "-oBatchmode yes");
 347                         break;
 348                 case 'l':
 349                         speed = strtod(optarg, &endp);
 350                         if (speed <= 0 || *endp != '\0')
 351                                 usage();
 352                         limit_rate = speed * 1024;
 353                         break;
 354                 case 'p':
 355                         pflag = 1;
 356                         break;
 357                 case 'r':
 358                         iamrecursive = 1;
 359                         break;
 360                 case 'S':
 361                         ssh_program = xstrdup(optarg);
 362                         break;
 363                 case 'v':
 364                         addargs(&args, "-v");
 365                         verbose_mode = 1;
 366                         break;
 367 #ifdef PROGRESS_METER
 368                 case 'q':
 369                         addargs(&args, "-q");
 370                         showprogress = 0;
 371                         break;
 372 #endif
 373
 374                 /* Server options. */
 375                 case 'd':
 376                         targetshouldbedirectory = 1;
 377                         break;
 378                 case 'f':       /* "from" */
 379                         iamremote = 1;
 380                         fflag = 1;
 381                         break;
 382                 case 't':       /* "to" */
 383                         iamremote = 1;
 384                         tflag = 1;
 385 #ifdef HAVE_CYGWIN
 386                         setmode(0, O_BINARY);
 387 #endif
 388                         break;
 389                 default:
 390                         usage();
 391                 }
 392         argc -= optind;
 393         argv += optind;
 394
 395         if ((pwd = getpwuid(userid = getuid())) == NULL)
 396                 fatal("unknown user %u", (u_int) userid);
 397
 398         if (!isatty(STDERR_FILENO))
 399                 showprogress = 0;
 400
 401         remin = STDIN_FILENO;
 402         remout = STDOUT_FILENO;
 403
 404         if (fflag) {
 405                 /* Follow "protocol", send data. */
 406                 (void) response();
 407                 source(argc, argv);
 408                 exit(errs != 0);
 409         }
 410         if (tflag) {
 411                 /* Receive data. */
 412                 sink(argc, argv);
 413                 exit(errs != 0);
 414         }
 415         if (argc < 2)
 416                 usage();
 417         if (argc > 2)
 418                 targetshouldbedirectory = 1;
 419
 420         remin = remout = -1;
 421         do_cmd_pid = -1;
 422         /* Command to be executed on remote system using "ssh". */
 423         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 424             verbose_mode ? " -v" : "",
 425             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 426             targetshouldbedirectory ? " -d" : "");
 427
 428         (void) signal(SIGPIPE, lostconn);
 429
 430         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 431                 toremote(targ, argc, argv);
 432         else {
 433                 if (targetshouldbedirectory)
 434                         verifydir(argv[argc - 1]);
 435                 tolocal(argc, argv);    /* Dest is local host. */
 436         }
 437         /*
 438          * Finally check the exit status of the ssh process, if one was forked
 439          * and no error has occured yet
 440          */
 441         if (do_cmd_pid != -1 && errs == 0) {
 442                 if (remin != -1)
 443                     (void) close(remin);
 444                 if (remout != -1)
 445                     (void) close(remout);
 446                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 447                         errs = 1;
 448                 else {
 449                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 450                                 errs = 1;
 451                 }
 452         }
 453         exit(errs != 0);
 454 }
 455 #endif /* DBMULTI_scp stuff */
 456
 457 void
 458 toremote(char *targ, int argc, char **argv)
 459 {
 460         int i, len;
 461         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 462         arglist alist;
 463
 464         memset(&alist, '\0', sizeof(alist));
 465         alist.list = NULL;
 466
 467         *targ++ = 0;
 468         if (*targ == 0)
 469                 targ = ".";
 470
 471         arg = xstrdup(argv[argc - 1]);
 472         if ((thost = strrchr(arg, '@'))) {
 473                 /* user@host */
 474                 *thost++ = 0;
 475                 tuser = arg;
 476                 if (*tuser == '\0')
 477                         tuser = NULL;
 478         } else {
 479                 thost = arg;
 480                 tuser = NULL;
 481         }
 482
 483         if (tuser != NULL && !okname(tuser)) {
 484                 xfree(arg);
 485                 return;
 486         }
 487
 488         for (i = 0; i < argc - 1; i++) {
 489                 src = colon(argv[i]);
 490                 if (src) {      /* remote to remote */
 491                         freeargs(&alist);
 492                         addargs(&alist, "%s", ssh_program);
 493                         if (verbose_mode)
 494                                 addargs(&alist, "-v");
 495                         addargs(&alist, "-x");
 496                         addargs(&alist, "-oClearAllForwardings yes");
 497                         addargs(&alist, "-n");
 498
 499                         *src++ = 0;
 500                         if (*src == 0)
 501                                 src = ".";
 502                         host = strrchr(argv[i], '@');
 503
 504                         if (host) {
 505                                 *host++ = 0;
 506                                 host = cleanhostname(host);
 507                                 suser = argv[i];
 508                                 if (*suser == '\0')
 509                                         suser = pwd->pw_name;
 510                                 else if (!okname(suser))
 511                                         continue;
 512                                 addargs(&alist, "-l");
 513                                 addargs(&alist, "%s", suser);
 514                         } else {
 515                                 host = cleanhostname(argv[i]);
 516                         }
 517                         addargs(&alist, "%s", host);
 518                         addargs(&alist, "%s", cmd);
 519                         addargs(&alist, "%s", src);
 520                         addargs(&alist, "%s%s%s:%s",
 521                             tuser ? tuser : "", tuser ? "@" : "",
 522                             thost, targ);
 523                         if (do_local_cmd(&alist) != 0)
 524                                 errs = 1;
 525                 } else {        /* local to remote */
 526                         if (remin == -1) {
 527                                 len = strlen(targ) + CMDNEEDS + 20;
 528                                 bp = xmalloc(len);
 529                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
 530                                 host = cleanhostname(thost);
 531                                 if (do_cmd(host, tuser, bp, &remin,
 532                                     &remout, argc) < 0)
 533                                         exit(1);
 534                                 if (response() < 0)
 535                                         exit(1);
 536                                 (void) xfree(bp);
 537                         }
 538                         source(1, argv + i);
 539                 }
 540         }
 541 }
 542
 543 void
 544 tolocal(int argc, char **argv)
 545 {
 546         int i, len;
 547         char *bp, *host, *src, *suser;
 548         arglist alist;
 549
 550         memset(&alist, '\0', sizeof(alist));
 551         alist.list = NULL;
 552
 553         for (i = 0; i < argc - 1; i++) {
 554                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 555                         freeargs(&alist);
 556                         addargs(&alist, "%s", _PATH_CP);
 557                         if (iamrecursive)
 558                                 addargs(&alist, "-r");
 559                         if (pflag)
 560                                 addargs(&alist, "-p");
 561                         addargs(&alist, "%s", argv[i]);
 562                         addargs(&alist, "%s", argv[argc-1]);
 563                         if (do_local_cmd(&alist))
 564                                 ++errs;
 565                         continue;
 566                 }
 567                 *src++ = 0;
 568                 if (*src == 0)
 569                         src = ".";
 570                 if ((host = strrchr(argv[i], '@')) == NULL) {
 571                         host = argv[i];
 572                         suser = NULL;
 573                 } else {
 574                         *host++ = 0;
 575                         suser = argv[i];
 576                         if (*suser == '\0')
 577                                 suser = pwd->pw_name;
 578                 }
 579                 host = cleanhostname(host);
 580                 len = strlen(src) + CMDNEEDS + 20;
 581                 bp = xmalloc(len);
 582                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
 583                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
 584                         (void) xfree(bp);
 585                         ++errs;
 586                         continue;
 587                 }
 588                 xfree(bp);
 589                 sink(1, argv + argc - 1);
 590                 (void) close(remin);
 591                 remin = remout = -1;
 592         }
 593 }
 594
 595 void
 596 source(int argc, char **argv)
 597 {
 598         struct stat stb;
 599         static BUF buffer;
 600         BUF *bp;
 601         off_t i, amt, statbytes;
 602         size_t result;
 603         int fd = -1, haderr, indx;
 604         char *last, *name, buf[2048];
 605         int len;
 606
 607         for (indx = 0; indx < argc; ++indx) {
 608                 name = argv[indx];
 609                 statbytes = 0;
 610                 len = strlen(name);
 611                 while (len > 1 && name[len-1] == '/')
 612                         name[--len] = '\0';
 613                 if (strchr(name, '\n') != NULL) {
 614                         run_err("%s: skipping, filename contains a newline",
 615                             name);
 616                         goto next;
 617                 }
 618                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 619                         goto syserr;
 620                 if (fstat(fd, &stb) < 0) {
 621 syserr:                 run_err("%s: %s", name, strerror(errno));
 622                         goto next;
 623                 }
 624                 switch (stb.st_mode & S_IFMT) {
 625                 case S_IFREG:
 626                         break;
 627                 case S_IFDIR:
 628                         if (iamrecursive) {
 629                                 rsource(name, &stb);
 630                                 goto next;
 631                         }
 632                         /* FALLTHROUGH */
 633                 default:
 634                         run_err("%s: not a regular file", name);
 635                         goto next;
 636                 }
 637                 if ((last = strrchr(name, '/')) == NULL)
 638                         last = name;
 639                 else
 640                         ++last;
 641                 curfile = last;
 642                 if (pflag) {
 643                         /*
 644                          * Make it compatible with possible future
 645                          * versions expecting microseconds.
 646                          */
 647                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 648                             (u_long) stb.st_mtime,
 649                             (u_long) stb.st_atime);
 650                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 651                         if (response() < 0)
 652                                 goto next;
 653                 }
 654 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 655                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 656                     (u_int) (stb.st_mode & FILEMODEMASK),
 657                     (long long)stb.st_size, last);
 658                 if (verbose_mode) {
 659                         fprintf(stderr, "Sending file modes: %s", buf);
 660                 }
 661                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 662                 if (response() < 0)
 663                         goto next;
 664                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 665 next:                   if (fd != -1) {
 666                                 (void) close(fd);
 667                                 fd = -1;
 668                         }
 669                         continue;
 670                 }
 671 #if PROGRESS_METER
 672                 if (showprogress)
 673                         start_progress_meter(curfile, stb.st_size, &statbytes);
 674 #endif
 675                 /* Keep writing after an error so that we stay sync'd up. */
 676                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 677                         amt = bp->cnt;
 678                         if (i + amt > stb.st_size)
 679                                 amt = stb.st_size - i;
 680                         if (!haderr) {
 681                                 result = atomicio(read, fd, bp->buf, amt);
 682                                 if (result != amt)
 683                                         haderr = errno;
 684                         }
 685                         if (haderr)
 686                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 687                         else {
 688                                 result = atomicio(vwrite, remout, bp->buf, amt);
 689                                 if (result != amt)
 690                                         haderr = errno;
 691                                 statbytes += result;
 692                         }
 693                         if (limit_rate)
 694                                 bwlimit(amt);
 695                 }
 696 #ifdef PROGRESS_METER
 697                 if (showprogress)
 698                         stop_progress_meter();
 699 #endif
 700
 701                 if (fd != -1) {
 702                         if (close(fd) < 0 && !haderr)
 703                                 haderr = errno;
 704                         fd = -1;
 705                 }
 706                 if (!haderr)
 707                         (void) atomicio(vwrite, remout, "", 1);
 708                 else
 709                         run_err("%s: %s", name, strerror(haderr));
 710                 (void) response();
 711         }
 712 }
 713
 714 void
 715 rsource(char *name, struct stat *statp)
 716 {
 717         DIR *dirp;
 718         struct dirent *dp;
 719         char *last, *vect[1], path[1100];
 720
 721         if (!(dirp = opendir(name))) {
 722                 run_err("%s: %s", name, strerror(errno));
 723                 return;
 724         }
 725         last = strrchr(name, '/');
 726         if (last == 0)
 727                 last = name;
 728         else
 729                 last++;
 730         if (pflag) {
 731                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 732                     (u_long) statp->st_mtime,
 733                     (u_long) statp->st_atime);
 734                 (void) atomicio(vwrite, remout, path, strlen(path));
 735                 if (response() < 0) {
 736                         closedir(dirp);
 737                         return;
 738                 }
 739         }
 740         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 741             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 742         if (verbose_mode)
 743                 fprintf(stderr, "Entering directory: %s", path);
 744         (void) atomicio(vwrite, remout, path, strlen(path));
 745         if (response() < 0) {
 746                 closedir(dirp);
 747                 return;
 748         }
 749         while ((dp = readdir(dirp)) != NULL) {
 750                 if (dp->d_ino == 0)
 751                         continue;
 752                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 753                         continue;
 754                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 755                         run_err("%s/%s: name too long", name, dp->d_name);
 756                         continue;
 757                 }
 758                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 759                 vect[0] = path;
 760                 source(1, vect);
 761         }
 762         (void) closedir(dirp);
 763         (void) atomicio(vwrite, remout, "E\n", 2);
 764         (void) response();
 765 }
 766
 767 void
 768 bwlimit(int amount)
 769 {
 770         static struct timeval bwstart, bwend;
 771         static int lamt, thresh = 16384;
 772         u_int64_t waitlen;
 773         struct timespec ts, rm;
 774
 775         if (!timerisset(&bwstart)) {
 776                 gettimeofday(&bwstart, NULL);
 777                 return;
 778         }
 779
 780         lamt += amount;
 781         if (lamt < thresh)
 782                 return;
 783
 784         gettimeofday(&bwend, NULL);
 785         timersub(&bwend, &bwstart, &bwend);
 786         if (!timerisset(&bwend))
 787                 return;
 788
 789         lamt *= 8;
 790         waitlen = (double)1000000L * lamt / limit_rate;
 791
 792         bwstart.tv_sec = waitlen / 1000000L;
 793         bwstart.tv_usec = waitlen % 1000000L;
 794
 795         if (timercmp(&bwstart, &bwend, >)) {
 796                 timersub(&bwstart, &bwend, &bwend);
 797
 798                 /* Adjust the wait time */
 799                 if (bwend.tv_sec) {
 800                         thresh /= 2;
 801                         if (thresh < 2048)
 802                                 thresh = 2048;
 803                 } else if (bwend.tv_usec < 100) {
 804                         thresh *= 2;
 805                         if (thresh > 32768)
 806                                 thresh = 32768;
 807                 }
 808
 809                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 810                 while (nanosleep(&ts, &rm) == -1) {
 811                         if (errno != EINTR)
 812                                 break;
 813                         ts = rm;
 814                 }
 815         }
 816
 817         lamt = 0;
 818         gettimeofday(&bwstart, NULL);
 819 }
 820
 821 void
 822 sink(int argc, char **argv)
 823 {
 824         static BUF buffer;
 825         struct stat stb;
 826         enum {
 827                 YES, NO, DISPLAYED
 828         } wrerr;
 829         BUF *bp;
 830         off_t i;
 831         size_t j, count;
 832         int amt, exists, first, mask, mode, ofd, omode;
 833         off_t size, statbytes;
 834         int setimes, targisdir, wrerrno = 0;
 835         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 836         struct timeval tv[2];
 837
 838 #define atime   tv[0]
 839 #define mtime   tv[1]
 840 #define SCREWUP(str)    { why = str; goto screwup; }
 841
 842         setimes = targisdir = 0;
 843         mask = umask(0);
 844         if (!pflag)
 845                 (void) umask(mask);
 846         if (argc != 1) {
 847                 run_err("ambiguous target");
 848                 exit(1);
 849         }
 850         targ = *argv;
 851         if (targetshouldbedirectory)
 852                 verifydir(targ);
 853
 854         (void) atomicio(vwrite, remout, "", 1);
 855         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 856                 targisdir = 1;
 857         for (first = 1;; first = 0) {
 858                 cp = buf;
 859                 if (atomicio(read, remin, cp, 1) != 1)
 860                         return;
 861                 if (*cp++ == '\n')
 862                         SCREWUP("unexpected <newline>");
 863                 do {
 864                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 865                                 SCREWUP("lost connection");
 866                         *cp++ = ch;
 867                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 868                 *cp = 0;
 869                 if (verbose_mode)
 870                         fprintf(stderr, "Sink: %s", buf);
 871
 872                 if (buf[0] == '\01' || buf[0] == '\02') {
 873                         if (iamremote == 0)
 874                                 (void) atomicio(vwrite, STDERR_FILENO,
 875                                     buf + 1, strlen(buf + 1));
 876                         if (buf[0] == '\02')
 877                                 exit(1);
 878                         ++errs;
 879                         continue;
 880                 }
 881                 if (buf[0] == 'E') {
 882                         (void) atomicio(vwrite, remout, "", 1);
 883                         return;
 884                 }
 885                 if (ch == '\n')
 886                         *--cp = 0;
 887
 888                 cp = buf;
 889                 if (*cp == 'T') {
 890                         setimes++;
 891                         cp++;
 892                         mtime.tv_sec = strtol(cp, &cp, 10);
 893                         if (!cp || *cp++ != ' ')
 894                                 SCREWUP("mtime.sec not delimited");
 895                         mtime.tv_usec = strtol(cp, &cp, 10);
 896                         if (!cp || *cp++ != ' ')
 897                                 SCREWUP("mtime.usec not delimited");
 898                         atime.tv_sec = strtol(cp, &cp, 10);
 899                         if (!cp || *cp++ != ' ')
 900                                 SCREWUP("atime.sec not delimited");
 901                         atime.tv_usec = strtol(cp, &cp, 10);
 902                         if (!cp || *cp++ != '\0')
 903                                 SCREWUP("atime.usec not delimited");
 904                         (void) atomicio(vwrite, remout, "", 1);
 905                         continue;
 906                 }
 907                 if (*cp != 'C' && *cp != 'D') {
 908                         /*
 909                          * Check for the case "rcp remote:foo\* local:bar".
 910                          * In this case, the line "No match." can be returned
 911                          * by the shell before the rcp command on the remote is
 912                          * executed so the ^Aerror_message convention isn't
 913                          * followed.
 914                          */
 915                         if (first) {
 916                                 run_err("%s", cp);
 917                                 exit(1);
 918                         }
 919                         SCREWUP("expected control record");
 920                 }
 921                 mode = 0;
 922                 for (++cp; cp < buf + 5; cp++) {
 923                         if (*cp < '0' || *cp > '7')
 924                                 SCREWUP("bad mode");
 925                         mode = (mode << 3) | (*cp - '0');
 926                 }
 927                 if (*cp++ != ' ')
 928                         SCREWUP("mode not delimited");
 929
 930                 for (size = 0; isdigit(*cp);)
 931                         size = size * 10 + (*cp++ - '0');
 932                 if (*cp++ != ' ')
 933                         SCREWUP("size not delimited");
 934                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 935                         run_err("error: unexpected filename: %s", cp);
 936                         exit(1);
 937                 }
 938                 if (targisdir) {
 939                         static char *namebuf;
 940                         static size_t cursize;
 941                         size_t need;
 942
 943                         need = strlen(targ) + strlen(cp) + 250;
 944                         if (need > cursize) {
 945                                 if (namebuf)
 946                                         xfree(namebuf);
 947                                 namebuf = xmalloc(need);
 948                                 cursize = need;
 949                         }
 950                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 951                             strcmp(targ, "/") ? "/" : "", cp);
 952                         np = namebuf;
 953                 } else
 954                         np = targ;
 955                 curfile = cp;
 956                 exists = stat(np, &stb) == 0;
 957                 if (buf[0] == 'D') {
 958                         int mod_flag = pflag;
 959                         if (!iamrecursive)
 960                                 SCREWUP("received directory without -r");
 961                         if (exists) {
 962                                 if (!S_ISDIR(stb.st_mode)) {
 963                                         errno = ENOTDIR;
 964                                         goto bad;
 965                                 }
 966                                 if (pflag)
 967                                         (void) chmod(np, mode);
 968                         } else {
 969                                 /* Handle copying from a read-only
 970                                    directory */
 971                                 mod_flag = 1;
 972                                 if (mkdir(np, mode | S_IRWXU) < 0)
 973                                         goto bad;
 974                         }
 975                         vect[0] = xstrdup(np);
 976                         sink(1, vect);
 977                         if (setimes) {
 978                                 setimes = 0;
 979                                 if (utimes(vect[0], tv) < 0)
 980                                         run_err("%s: set times: %s",
 981                                             vect[0], strerror(errno));
 982                         }
 983                         if (mod_flag)
 984                                 (void) chmod(vect[0], mode);
 985                         if (vect[0])
 986                                 xfree(vect[0]);
 987                         continue;
 988                 }
 989                 omode = mode;
 990                 mode |= S_IWRITE;
 991                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 992 bad:                    run_err("%s: %s", np, strerror(errno));
 993                         continue;
 994                 }
 995                 (void) atomicio(vwrite, remout, "", 1);
 996                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 997                         (void) close(ofd);
 998                         continue;
 999                 }
1000                 cp = bp->buf;
1001                 wrerr = NO;
1002
1003                 statbytes = 0;
1004 #ifdef PROGRESS_METER
1005                 if (showprogress)
1006                         start_progress_meter(curfile, size, &statbytes);
1007 #endif
1008                 for (count = i = 0; i < size; i += 4096) {
1009                         amt = 4096;
1010                         if (i + amt > size)
1011                                 amt = size - i;
1012                         count += amt;
1013                         do {
1014                                 j = atomicio(read, remin, cp, amt);
1015                                 if (j == 0) {
1016                                         run_err("%s", j ? strerror(errno) :
1017                                             "dropped connection");
1018                                         exit(1);
1019                                 }
1020                                 amt -= j;
1021                                 cp += j;
1022                                 statbytes += j;
1023                         } while (amt > 0);
1024
1025                         if (limit_rate)
1026                                 bwlimit(4096);
1027
1028                         if (count == bp->cnt) {
1029                                 /* Keep reading so we stay sync'd up. */
1030                                 if (wrerr == NO) {
1031                                         if (atomicio(vwrite, ofd, bp->buf,
1032                                             count) != count) {
1033                                                 wrerr = YES;
1034                                                 wrerrno = errno;
1035                                         }
1036                                 }
1037                                 count = 0;
1038                                 cp = bp->buf;
1039                         }
1040                 }
1041 #ifdef PROGRESS_METER
1042                 if (showprogress)
1043                         stop_progress_meter();
1044 #endif
1045                 if (count != 0 && wrerr == NO &&
1046                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1047                         wrerr = YES;
1048                         wrerrno = errno;
1049                 }
1050                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
1051                         run_err("%s: truncate: %s", np, strerror(errno));
1052                         wrerr = DISPLAYED;
1053                 }
1054                 if (pflag) {
1055                         if (exists || omode != mode)
1056 #ifdef HAVE_FCHMOD
1057                                 if (fchmod(ofd, omode)) {
1058 #else /* HAVE_FCHMOD */
1059                                 if (chmod(np, omode)) {
1060 #endif /* HAVE_FCHMOD */
1061                                         run_err("%s: set mode: %s",
1062                                             np, strerror(errno));
1063                                         wrerr = DISPLAYED;
1064                                 }
1065                 } else {
1066                         if (!exists && omode != mode)
1067 #ifdef HAVE_FCHMOD
1068                                 if (fchmod(ofd, omode & ~mask)) {
1069 #else /* HAVE_FCHMOD */
1070                                 if (chmod(np, omode & ~mask)) {
1071 #endif /* HAVE_FCHMOD */
1072                                         run_err("%s: set mode: %s",
1073                                             np, strerror(errno));
1074                                         wrerr = DISPLAYED;
1075                                 }
1076                 }
1077                 if (close(ofd) == -1) {
1078                         wrerr = YES;
1079                         wrerrno = errno;
1080                 }
1081                 (void) response();
1082                 if (setimes && wrerr == NO) {
1083                         setimes = 0;
1084                         if (utimes(np, tv) < 0) {
1085                                 run_err("%s: set times: %s",
1086                                     np, strerror(errno));
1087                                 wrerr = DISPLAYED;
1088                         }
1089                 }
1090                 switch (wrerr) {
1091                 case YES:
1092                         run_err("%s: %s", np, strerror(wrerrno));
1093                         break;
1094                 case NO:
1095                         (void) atomicio(vwrite, remout, "", 1);
1096                         break;
1097                 case DISPLAYED:
1098                         break;
1099                 }
1100         }
1101 screwup:
1102         run_err("protocol error: %s", why);
1103         exit(1);
1104 }
1105
1106 int
1107 response(void)
1108 {
1109         char ch, *cp, resp, rbuf[2048];
1110
1111         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1112                 lostconn(0);
1113
1114         cp = rbuf;
1115         switch (resp) {
1116         case 0:         /* ok */
1117                 return (0);
1118         default:
1119                 *cp++ = resp;
1120                 /* FALLTHROUGH */
1121         case 1:         /* error, followed by error msg */
1122         case 2:         /* fatal error, "" */
1123                 do {
1124                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1125                                 lostconn(0);
1126                         *cp++ = ch;
1127                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1128
1129                 if (!iamremote)
1130                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1131                 ++errs;
1132                 if (resp == 1)
1133                         return (-1);
1134                 exit(1);
1135         }
1136         /* NOTREACHED */
1137 }
1138
1139 void
1140 usage(void)
1141 {
1142         (void) fprintf(stderr,
1143             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1144             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1145             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1146         exit(1);
1147 }
1148
1149 void
1150 run_err(const char *fmt,...)
1151 {
1152         static FILE *fp;
1153         va_list ap;
1154
1155         ++errs;
1156         if (fp == NULL && !(fp = fdopen(remout, "w")))
1157                 return;
1158         (void) fprintf(fp, "%c", 0x01);
1159         (void) fprintf(fp, "scp: ");
1160         va_start(ap, fmt);
1161         (void) vfprintf(fp, fmt, ap);
1162         va_end(ap);
1163         (void) fprintf(fp, "\n");
1164         (void) fflush(fp);
1165
1166         if (!iamremote) {
1167                 va_start(ap, fmt);
1168                 vfprintf(stderr, fmt, ap);
1169                 va_end(ap);
1170                 fprintf(stderr, "\n");
1171         }
1172 }
1173
1174 void
1175 verifydir(char *cp)
1176 {
1177         struct stat stb;
1178
1179         if (!stat(cp, &stb)) {
1180                 if (S_ISDIR(stb.st_mode))
1181                         return;
1182                 errno = ENOTDIR;
1183         }
1184         run_err("%s: %s", cp, strerror(errno));
1185         killchild(0);
1186 }
1187
1188 int
1189 okname(char *cp0)
1190 {
1191         int c;
1192         char *cp;
1193
1194         cp = cp0;
1195         do {
1196                 c = (int)*cp;
1197                 if (c & 0200)
1198                         goto bad;
1199                 if (!isalpha(c) && !isdigit(c)) {
1200                         switch (c) {
1201                         case '\'':
1202                         case '"':
1203                         case '`':
1204                         case ' ':
1205                         case '#':
1206                                 goto bad;
1207                         default:
1208                                 break;
1209                         }
1210                 }
1211         } while (*++cp);
1212         return (1);
1213
1214 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1215         return (0);
1216 }
1217
1218 BUF *
1219 allocbuf(BUF *bp, int fd, int blksize)
1220 {
1221         size_t size;
1222 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1223         struct stat stb;
1224
1225         if (fstat(fd, &stb) < 0) {
1226                 run_err("fstat: %s", strerror(errno));
1227                 return (0);
1228         }
1229         size = roundup(stb.st_blksize, blksize);
1230         if (size == 0)
1231                 size = blksize;
1232 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1233         size = blksize;
1234 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1235         if (bp->cnt >= size)
1236                 return (bp);
1237         if (bp->buf == NULL)
1238                 bp->buf = xmalloc(size);
1239         else
1240                 bp->buf = xrealloc(bp->buf, size);
1241         memset(bp->buf, 0, size);
1242         bp->cnt = size;
1243         return (bp);
1244 }
1245
1246 void
1247 lostconn(int signo)
1248 {
1249         if (!iamremote)
1250                 write(STDERR_FILENO, "lost connection\n", 16);
1251         if (signo)
1252                 _exit(1);
1253         else
1254                 exit(1);
1255 }