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                         fprintf(stderr, "Note: -B option is disabled in this version of scp");
 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 #if 0
 496                         // Disabled since dbclient won't understand them
 497                         // and scp works fine without them.
 498                         addargs(&alist, "-x");
 499                         addargs(&alist, "-oClearAllForwardings yes");
 500                         addargs(&alist, "-n");
 501 #endif
 502
 503                         *src++ = 0;
 504                         if (*src == 0)
 505                                 src = ".";
 506                         host = strrchr(argv[i], '@');
 507
 508                         if (host) {
 509                                 *host++ = 0;
 510                                 host = cleanhostname(host);
 511                                 suser = argv[i];
 512                                 if (*suser == '\0')
 513                                         suser = pwd->pw_name;
 514                                 else if (!okname(suser))
 515                                         continue;
 516                                 addargs(&alist, "-l");
 517                                 addargs(&alist, "%s", suser);
 518                         } else {
 519                                 host = cleanhostname(argv[i]);
 520                         }
 521                         addargs(&alist, "%s", host);
 522                         addargs(&alist, "%s", cmd);
 523                         addargs(&alist, "%s", src);
 524                         addargs(&alist, "%s%s%s:%s",
 525                             tuser ? tuser : "", tuser ? "@" : "",
 526                             thost, targ);
 527                         if (do_local_cmd(&alist) != 0)
 528                                 errs = 1;
 529                 } else {        /* local to remote */
 530                         if (remin == -1) {
 531                                 len = strlen(targ) + CMDNEEDS + 20;
 532                                 bp = xmalloc(len);
 533                                 (void) snprintf(bp, len, "%s -t %s", cmd, targ);
 534                                 host = cleanhostname(thost);
 535                                 if (do_cmd(host, tuser, bp, &remin,
 536                                     &remout, argc) < 0)
 537                                         exit(1);
 538                                 if (response() < 0)
 539                                         exit(1);
 540                                 (void) xfree(bp);
 541                         }
 542                         source(1, argv + i);
 543                 }
 544         }
 545 }
 546
 547 void
 548 tolocal(int argc, char **argv)
 549 {
 550         int i, len;
 551         char *bp, *host, *src, *suser;
 552         arglist alist;
 553
 554         memset(&alist, '\0', sizeof(alist));
 555         alist.list = NULL;
 556
 557         for (i = 0; i < argc - 1; i++) {
 558                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 559                         freeargs(&alist);
 560                         addargs(&alist, "%s", _PATH_CP);
 561                         if (iamrecursive)
 562                                 addargs(&alist, "-r");
 563                         if (pflag)
 564                                 addargs(&alist, "-p");
 565                         addargs(&alist, "%s", argv[i]);
 566                         addargs(&alist, "%s", argv[argc-1]);
 567                         if (do_local_cmd(&alist))
 568                                 ++errs;
 569                         continue;
 570                 }
 571                 *src++ = 0;
 572                 if (*src == 0)
 573                         src = ".";
 574                 if ((host = strrchr(argv[i], '@')) == NULL) {
 575                         host = argv[i];
 576                         suser = NULL;
 577                 } else {
 578                         *host++ = 0;
 579                         suser = argv[i];
 580                         if (*suser == '\0')
 581                                 suser = pwd->pw_name;
 582                 }
 583                 host = cleanhostname(host);
 584                 len = strlen(src) + CMDNEEDS + 20;
 585                 bp = xmalloc(len);
 586                 (void) snprintf(bp, len, "%s -f %s", cmd, src);
 587                 if (do_cmd(host, suser, bp, &remin, &remout, argc) < 0) {
 588                         (void) xfree(bp);
 589                         ++errs;
 590                         continue;
 591                 }
 592                 xfree(bp);
 593                 sink(1, argv + argc - 1);
 594                 (void) close(remin);
 595                 remin = remout = -1;
 596         }
 597 }
 598
 599 void
 600 source(int argc, char **argv)
 601 {
 602         struct stat stb;
 603         static BUF buffer;
 604         BUF *bp;
 605         off_t i, amt, statbytes;
 606         size_t result;
 607         int fd = -1, haderr, indx;
 608         char *last, *name, buf[2048];
 609         int len;
 610
 611         for (indx = 0; indx < argc; ++indx) {
 612                 name = argv[indx];
 613                 statbytes = 0;
 614                 len = strlen(name);
 615                 while (len > 1 && name[len-1] == '/')
 616                         name[--len] = '\0';
 617                 if (strchr(name, '\n') != NULL) {
 618                         run_err("%s: skipping, filename contains a newline",
 619                             name);
 620                         goto next;
 621                 }
 622                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 623                         goto syserr;
 624                 if (fstat(fd, &stb) < 0) {
 625 syserr:                 run_err("%s: %s", name, strerror(errno));
 626                         goto next;
 627                 }
 628                 switch (stb.st_mode & S_IFMT) {
 629                 case S_IFREG:
 630                         break;
 631                 case S_IFDIR:
 632                         if (iamrecursive) {
 633                                 rsource(name, &stb);
 634                                 goto next;
 635                         }
 636                         /* FALLTHROUGH */
 637                 default:
 638                         run_err("%s: not a regular file", name);
 639                         goto next;
 640                 }
 641                 if ((last = strrchr(name, '/')) == NULL)
 642                         last = name;
 643                 else
 644                         ++last;
 645                 curfile = last;
 646                 if (pflag) {
 647                         /*
 648                          * Make it compatible with possible future
 649                          * versions expecting microseconds.
 650                          */
 651                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 652                             (u_long) stb.st_mtime,
 653                             (u_long) stb.st_atime);
 654                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 655                         if (response() < 0)
 656                                 goto next;
 657                 }
 658 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 659                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 660                     (u_int) (stb.st_mode & FILEMODEMASK),
 661                     (long long)stb.st_size, last);
 662                 if (verbose_mode) {
 663                         fprintf(stderr, "Sending file modes: %s", buf);
 664                 }
 665                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 666                 if (response() < 0)
 667                         goto next;
 668                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 669 next:                   if (fd != -1) {
 670                                 (void) close(fd);
 671                                 fd = -1;
 672                         }
 673                         continue;
 674                 }
 675 #if PROGRESS_METER
 676                 if (showprogress)
 677                         start_progress_meter(curfile, stb.st_size, &statbytes);
 678 #endif
 679                 /* Keep writing after an error so that we stay sync'd up. */
 680                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 681                         amt = bp->cnt;
 682                         if (i + amt > stb.st_size)
 683                                 amt = stb.st_size - i;
 684                         if (!haderr) {
 685                                 result = atomicio(read, fd, bp->buf, amt);
 686                                 if (result != amt)
 687                                         haderr = errno;
 688                         }
 689                         if (haderr)
 690                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 691                         else {
 692                                 result = atomicio(vwrite, remout, bp->buf, amt);
 693                                 if (result != amt)
 694                                         haderr = errno;
 695                                 statbytes += result;
 696                         }
 697                         if (limit_rate)
 698                                 bwlimit(amt);
 699                 }
 700 #ifdef PROGRESS_METER
 701                 if (showprogress)
 702                         stop_progress_meter();
 703 #endif
 704
 705                 if (fd != -1) {
 706                         if (close(fd) < 0 && !haderr)
 707                                 haderr = errno;
 708                         fd = -1;
 709                 }
 710                 if (!haderr)
 711                         (void) atomicio(vwrite, remout, "", 1);
 712                 else
 713                         run_err("%s: %s", name, strerror(haderr));
 714                 (void) response();
 715         }
 716 }
 717
 718 void
 719 rsource(char *name, struct stat *statp)
 720 {
 721         DIR *dirp;
 722         struct dirent *dp;
 723         char *last, *vect[1], path[1100];
 724
 725         if (!(dirp = opendir(name))) {
 726                 run_err("%s: %s", name, strerror(errno));
 727                 return;
 728         }
 729         last = strrchr(name, '/');
 730         if (last == 0)
 731                 last = name;
 732         else
 733                 last++;
 734         if (pflag) {
 735                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 736                     (u_long) statp->st_mtime,
 737                     (u_long) statp->st_atime);
 738                 (void) atomicio(vwrite, remout, path, strlen(path));
 739                 if (response() < 0) {
 740                         closedir(dirp);
 741                         return;
 742                 }
 743         }
 744         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 745             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 746         if (verbose_mode)
 747                 fprintf(stderr, "Entering directory: %s", path);
 748         (void) atomicio(vwrite, remout, path, strlen(path));
 749         if (response() < 0) {
 750                 closedir(dirp);
 751                 return;
 752         }
 753         while ((dp = readdir(dirp)) != NULL) {
 754                 if (dp->d_ino == 0)
 755                         continue;
 756                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 757                         continue;
 758                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 759                         run_err("%s/%s: name too long", name, dp->d_name);
 760                         continue;
 761                 }
 762                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 763                 vect[0] = path;
 764                 source(1, vect);
 765         }
 766         (void) closedir(dirp);
 767         (void) atomicio(vwrite, remout, "E\n", 2);
 768         (void) response();
 769 }
 770
 771 void
 772 bwlimit(int amount)
 773 {
 774         static struct timeval bwstart, bwend;
 775         static int lamt, thresh = 16384;
 776         uint64_t waitlen;
 777         struct timespec ts, rm;
 778
 779         if (!timerisset(&bwstart)) {
 780                 gettimeofday(&bwstart, NULL);
 781                 return;
 782         }
 783
 784         lamt += amount;
 785         if (lamt < thresh)
 786                 return;
 787
 788         gettimeofday(&bwend, NULL);
 789         timersub(&bwend, &bwstart, &bwend);
 790         if (!timerisset(&bwend))
 791                 return;
 792
 793         lamt *= 8;
 794         waitlen = (double)1000000L * lamt / limit_rate;
 795
 796         bwstart.tv_sec = waitlen / 1000000L;
 797         bwstart.tv_usec = waitlen % 1000000L;
 798
 799         if (timercmp(&bwstart, &bwend, >)) {
 800                 timersub(&bwstart, &bwend, &bwend);
 801
 802                 /* Adjust the wait time */
 803                 if (bwend.tv_sec) {
 804                         thresh /= 2;
 805                         if (thresh < 2048)
 806                                 thresh = 2048;
 807                 } else if (bwend.tv_usec < 100) {
 808                         thresh *= 2;
 809                         if (thresh > 32768)
 810                                 thresh = 32768;
 811                 }
 812
 813                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 814                 while (nanosleep(&ts, &rm) == -1) {
 815                         if (errno != EINTR)
 816                                 break;
 817                         ts = rm;
 818                 }
 819         }
 820
 821         lamt = 0;
 822         gettimeofday(&bwstart, NULL);
 823 }
 824
 825 void
 826 sink(int argc, char **argv)
 827 {
 828         static BUF buffer;
 829         struct stat stb;
 830         enum {
 831                 YES, NO, DISPLAYED
 832         } wrerr;
 833         BUF *bp;
 834         off_t i;
 835         size_t j, count;
 836         int amt, exists, first, mask, mode, ofd, omode;
 837         off_t size, statbytes;
 838         int setimes, targisdir, wrerrno = 0;
 839         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 840         struct timeval tv[2];
 841
 842 #define atime   tv[0]
 843 #define mtime   tv[1]
 844 #define SCREWUP(str)    { why = str; goto screwup; }
 845
 846         setimes = targisdir = 0;
 847         mask = umask(0);
 848         if (!pflag)
 849                 (void) umask(mask);
 850         if (argc != 1) {
 851                 run_err("ambiguous target");
 852                 exit(1);
 853         }
 854         targ = *argv;
 855         if (targetshouldbedirectory)
 856                 verifydir(targ);
 857
 858         (void) atomicio(vwrite, remout, "", 1);
 859         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 860                 targisdir = 1;
 861         for (first = 1;; first = 0) {
 862                 cp = buf;
 863                 if (atomicio(read, remin, cp, 1) != 1)
 864                         return;
 865                 if (*cp++ == '\n')
 866                         SCREWUP("unexpected <newline>");
 867                 do {
 868                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 869                                 SCREWUP("lost connection");
 870                         *cp++ = ch;
 871                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 872                 *cp = 0;
 873                 if (verbose_mode)
 874                         fprintf(stderr, "Sink: %s", buf);
 875
 876                 if (buf[0] == '\01' || buf[0] == '\02') {
 877                         if (iamremote == 0)
 878                                 (void) atomicio(vwrite, STDERR_FILENO,
 879                                     buf + 1, strlen(buf + 1));
 880                         if (buf[0] == '\02')
 881                                 exit(1);
 882                         ++errs;
 883                         continue;
 884                 }
 885                 if (buf[0] == 'E') {
 886                         (void) atomicio(vwrite, remout, "", 1);
 887                         return;
 888                 }
 889                 if (ch == '\n')
 890                         *--cp = 0;
 891
 892                 cp = buf;
 893                 if (*cp == 'T') {
 894                         setimes++;
 895                         cp++;
 896                         mtime.tv_sec = strtol(cp, &cp, 10);
 897                         if (!cp || *cp++ != ' ')
 898                                 SCREWUP("mtime.sec not delimited");
 899                         mtime.tv_usec = strtol(cp, &cp, 10);
 900                         if (!cp || *cp++ != ' ')
 901                                 SCREWUP("mtime.usec not delimited");
 902                         atime.tv_sec = strtol(cp, &cp, 10);
 903                         if (!cp || *cp++ != ' ')
 904                                 SCREWUP("atime.sec not delimited");
 905                         atime.tv_usec = strtol(cp, &cp, 10);
 906                         if (!cp || *cp++ != '\0')
 907                                 SCREWUP("atime.usec not delimited");
 908                         (void) atomicio(vwrite, remout, "", 1);
 909                         continue;
 910                 }
 911                 if (*cp != 'C' && *cp != 'D') {
 912                         /*
 913                          * Check for the case "rcp remote:foo\* local:bar".
 914                          * In this case, the line "No match." can be returned
 915                          * by the shell before the rcp command on the remote is
 916                          * executed so the ^Aerror_message convention isn't
 917                          * followed.
 918                          */
 919                         if (first) {
 920                                 run_err("%s", cp);
 921                                 exit(1);
 922                         }
 923                         SCREWUP("expected control record");
 924                 }
 925                 mode = 0;
 926                 for (++cp; cp < buf + 5; cp++) {
 927                         if (*cp < '0' || *cp > '7')
 928                                 SCREWUP("bad mode");
 929                         mode = (mode << 3) | (*cp - '0');
 930                 }
 931                 if (*cp++ != ' ')
 932                         SCREWUP("mode not delimited");
 933
 934                 for (size = 0; isdigit(*cp);)
 935                         size = size * 10 + (*cp++ - '0');
 936                 if (*cp++ != ' ')
 937                         SCREWUP("size not delimited");
 938                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 939                         run_err("error: unexpected filename: %s", cp);
 940                         exit(1);
 941                 }
 942                 if (targisdir) {
 943                         static char *namebuf;
 944                         static size_t cursize;
 945                         size_t need;
 946
 947                         need = strlen(targ) + strlen(cp) + 250;
 948                         if (need > cursize) {
 949                                 if (namebuf)
 950                                         xfree(namebuf);
 951                                 namebuf = xmalloc(need);
 952                                 cursize = need;
 953                         }
 954                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 955                             strcmp(targ, "/") ? "/" : "", cp);
 956                         np = namebuf;
 957                 } else
 958                         np = targ;
 959                 curfile = cp;
 960                 exists = stat(np, &stb) == 0;
 961                 if (buf[0] == 'D') {
 962                         int mod_flag = pflag;
 963                         if (!iamrecursive)
 964                                 SCREWUP("received directory without -r");
 965                         if (exists) {
 966                                 if (!S_ISDIR(stb.st_mode)) {
 967                                         errno = ENOTDIR;
 968                                         goto bad;
 969                                 }
 970                                 if (pflag)
 971                                         (void) chmod(np, mode);
 972                         } else {
 973                                 /* Handle copying from a read-only
 974                                    directory */
 975                                 mod_flag = 1;
 976                                 if (mkdir(np, mode | S_IRWXU) < 0)
 977                                         goto bad;
 978                         }
 979                         vect[0] = xstrdup(np);
 980                         sink(1, vect);
 981                         if (setimes) {
 982                                 setimes = 0;
 983                                 if (utimes(vect[0], tv) < 0)
 984                                         run_err("%s: set times: %s",
 985                                             vect[0], strerror(errno));
 986                         }
 987                         if (mod_flag)
 988                                 (void) chmod(vect[0], mode);
 989                         if (vect[0])
 990                                 xfree(vect[0]);
 991                         continue;
 992                 }
 993                 omode = mode;
 994                 mode |= S_IWRITE;
 995                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 996 bad:                    run_err("%s: %s", np, strerror(errno));
 997                         continue;
 998                 }
 999                 (void) atomicio(vwrite, remout, "", 1);
1000                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
1001                         (void) close(ofd);
1002                         continue;
1003                 }
1004                 cp = bp->buf;
1005                 wrerr = NO;
1006
1007                 statbytes = 0;
1008 #ifdef PROGRESS_METER
1009                 if (showprogress)
1010                         start_progress_meter(curfile, size, &statbytes);
1011 #endif
1012                 for (count = i = 0; i < size; i += 4096) {
1013                         amt = 4096;
1014                         if (i + amt > size)
1015                                 amt = size - i;
1016                         count += amt;
1017                         do {
1018                                 j = atomicio(read, remin, cp, amt);
1019                                 if (j == 0) {
1020                                         run_err("%s", j ? strerror(errno) :
1021                                             "dropped connection");
1022                                         exit(1);
1023                                 }
1024                                 amt -= j;
1025                                 cp += j;
1026                                 statbytes += j;
1027                         } while (amt > 0);
1028
1029                         if (limit_rate)
1030                                 bwlimit(4096);
1031
1032                         if (count == bp->cnt) {
1033                                 /* Keep reading so we stay sync'd up. */
1034                                 if (wrerr == NO) {
1035                                         if (atomicio(vwrite, ofd, bp->buf,
1036                                             count) != count) {
1037                                                 wrerr = YES;
1038                                                 wrerrno = errno;
1039                                         }
1040                                 }
1041                                 count = 0;
1042                                 cp = bp->buf;
1043                         }
1044                 }
1045 #ifdef PROGRESS_METER
1046                 if (showprogress)
1047                         stop_progress_meter();
1048 #endif
1049                 if (count != 0 && wrerr == NO &&
1050                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1051                         wrerr = YES;
1052                         wrerrno = errno;
1053                 }
1054                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
1055                         run_err("%s: truncate: %s", np, strerror(errno));
1056                         wrerr = DISPLAYED;
1057                 }
1058                 if (pflag) {
1059                         if (exists || omode != mode)
1060 #ifdef HAVE_FCHMOD
1061                                 if (fchmod(ofd, omode)) {
1062 #else /* HAVE_FCHMOD */
1063                                 if (chmod(np, omode)) {
1064 #endif /* HAVE_FCHMOD */
1065                                         run_err("%s: set mode: %s",
1066                                             np, strerror(errno));
1067                                         wrerr = DISPLAYED;
1068                                 }
1069                 } else {
1070                         if (!exists && omode != mode)
1071 #ifdef HAVE_FCHMOD
1072                                 if (fchmod(ofd, omode & ~mask)) {
1073 #else /* HAVE_FCHMOD */
1074                                 if (chmod(np, omode & ~mask)) {
1075 #endif /* HAVE_FCHMOD */
1076                                         run_err("%s: set mode: %s",
1077                                             np, strerror(errno));
1078                                         wrerr = DISPLAYED;
1079                                 }
1080                 }
1081                 if (close(ofd) == -1) {
1082                         wrerr = YES;
1083                         wrerrno = errno;
1084                 }
1085                 (void) response();
1086                 if (setimes && wrerr == NO) {
1087                         setimes = 0;
1088                         if (utimes(np, tv) < 0) {
1089                                 run_err("%s: set times: %s",
1090                                     np, strerror(errno));
1091                                 wrerr = DISPLAYED;
1092                         }
1093                 }
1094                 switch (wrerr) {
1095                 case YES:
1096                         run_err("%s: %s", np, strerror(wrerrno));
1097                         break;
1098                 case NO:
1099                         (void) atomicio(vwrite, remout, "", 1);
1100                         break;
1101                 case DISPLAYED:
1102                         break;
1103                 }
1104         }
1105 screwup:
1106         run_err("protocol error: %s", why);
1107         exit(1);
1108 }
1109
1110 int
1111 response(void)
1112 {
1113         char ch, *cp, resp, rbuf[2048];
1114
1115         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1116                 lostconn(0);
1117
1118         cp = rbuf;
1119         switch (resp) {
1120         case 0:         /* ok */
1121                 return (0);
1122         default:
1123                 *cp++ = resp;
1124                 /* FALLTHROUGH */
1125         case 1:         /* error, followed by error msg */
1126         case 2:         /* fatal error, "" */
1127                 do {
1128                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1129                                 lostconn(0);
1130                         *cp++ = ch;
1131                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1132
1133                 if (!iamremote)
1134                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1135                 ++errs;
1136                 if (resp == 1)
1137                         return (-1);
1138                 exit(1);
1139         }
1140         /* NOTREACHED */
1141 }
1142
1143 void
1144 usage(void)
1145 {
1146         (void) fprintf(stderr,
1147             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1148             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1149             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1150         exit(1);
1151 }
1152
1153 void
1154 run_err(const char *fmt,...)
1155 {
1156         static FILE *fp;
1157         va_list ap;
1158
1159         ++errs;
1160         if (fp == NULL && !(fp = fdopen(remout, "w")))
1161                 return;
1162         (void) fprintf(fp, "%c", 0x01);
1163         (void) fprintf(fp, "scp: ");
1164         va_start(ap, fmt);
1165         (void) vfprintf(fp, fmt, ap);
1166         va_end(ap);
1167         (void) fprintf(fp, "\n");
1168         (void) fflush(fp);
1169
1170         if (!iamremote) {
1171                 va_start(ap, fmt);
1172                 vfprintf(stderr, fmt, ap);
1173                 va_end(ap);
1174                 fprintf(stderr, "\n");
1175         }
1176 }
1177
1178 void
1179 verifydir(char *cp)
1180 {
1181         struct stat stb;
1182
1183         if (!stat(cp, &stb)) {
1184                 if (S_ISDIR(stb.st_mode))
1185                         return;
1186                 errno = ENOTDIR;
1187         }
1188         run_err("%s: %s", cp, strerror(errno));
1189         killchild(0);
1190 }
1191
1192 int
1193 okname(char *cp0)
1194 {
1195         int c;
1196         char *cp;
1197
1198         cp = cp0;
1199         do {
1200                 c = (int)*cp;
1201                 if (c & 0200)
1202                         goto bad;
1203                 if (!isalpha(c) && !isdigit(c)) {
1204                         switch (c) {
1205                         case '\'':
1206                         case '"':
1207                         case '`':
1208                         case ' ':
1209                         case '#':
1210                                 goto bad;
1211                         default:
1212                                 break;
1213                         }
1214                 }
1215         } while (*++cp);
1216         return (1);
1217
1218 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1219         return (0);
1220 }
1221
1222 BUF *
1223 allocbuf(BUF *bp, int fd, int blksize)
1224 {
1225         size_t size;
1226 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1227         struct stat stb;
1228
1229         if (fstat(fd, &stb) < 0) {
1230                 run_err("fstat: %s", strerror(errno));
1231                 return (0);
1232         }
1233         size = roundup(stb.st_blksize, blksize);
1234         if (size == 0)
1235                 size = blksize;
1236 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1237         size = blksize;
1238 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1239         if (bp->cnt >= size)
1240                 return (bp);
1241         if (bp->buf == NULL)
1242                 bp->buf = xmalloc(size);
1243         else
1244                 bp->buf = xrealloc(bp->buf, size);
1245         memset(bp->buf, 0, size);
1246         bp->cnt = size;
1247         return (bp);
1248 }
1249
1250 void
1251 lostconn(int signo)
1252 {
1253         if (!iamremote)
1254                 write(STDERR_FILENO, "lost connection\n", 16);
1255         if (signo)
1256                 _exit(1);
1257         else
1258                 exit(1);
1259 }