scp.c

   1 /* $OpenBSD: scp.c,v 1.150 2006/07/22 20:48:23 stevesk Exp $ */
   2 /*
   3  * scp - secure remote copy.  This is basically patched BSD rcp which
   4  * uses ssh to do the data transfer (instead of using rcmd).
   5  *
   6  * NOTE: This version should NOT be suid root.  (This uses ssh to
   7  * do the transfer and ssh has the necessary privileges.)
   8  *
   9  * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
  10  *
  11  * As far as I am concerned, the code I have written for this software
  12  * can be used freely for any purpose.  Any derived versions of this
  13  * software must be clearly marked as such, and if the derived work is
  14  * incompatible with the protocol description in the RFC file, it must be
  15  * called by a name other than "ssh" or "Secure Shell".
  16  */
  17 /*
  18  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  19  * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  * 1. Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in the
  28  *    documentation and/or other materials provided with the distribution.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  33  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  39  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 /*
  43  * Parts from:
  44  *
  45  * Copyright (c) 1983, 1990, 1992, 1993, 1995
  46  *      The Regents of the University of California.  All rights reserved.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice, this list of conditions and the following disclaimer.
  53  * 2. Redistributions in binary form must reproduce the above copyright
  54  *    notice, this list of conditions and the following disclaimer in the
  55  *    documentation and/or other materials provided with the distribution.
  56  * 3. Neither the name of the University nor the names of its contributors
  57  *    may be used to endorse or promote products derived from this software
  58  *    without specific prior written permission.
  59  *
  60  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  61  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  63  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  64  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  65  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  66  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  67  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  68  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  69  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  70  * SUCH DAMAGE.
  71  *
  72  */
  73
  74 #include "includes.h"
  75
  76 #include <sys/types.h>
  77 #ifdef HAVE_SYS_STAT_H
  78 # include <sys/stat.h>
  79 #endif
  80 #include <sys/wait.h>
  81
  82 #include <ctype.h>
  83 #include <dirent.h>
  84 #include <errno.h>
  85 #include <fcntl.h>
  86 #include <pwd.h>
  87 #include <signal.h>
  88 #include <stdarg.h>
  89 #include <string.h>
  90 #include <time.h>
  91 #include <unistd.h>
  92
  93 #include "xmalloc.h"
  94 #include "atomicio.h"
  95 #include "pathnames.h"
  96 #include "log.h"
  97 #include "misc.h"
  98 #include "progressmeter.h"
  99
 100 extern char *__progname;
 101
 102 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 103
 104 void bwlimit(int);
 105
 106 /* Struct for addargs */
 107 arglist args;
 108
 109 /* Bandwidth limit */
 110 off_t limit_rate = 0;
 111
 112 /* Name of current file being transferred. */
 113 char *curfile;
 114
 115 /* This is set to non-zero to enable verbose mode. */
 116 int verbose_mode = 0;
 117
 118 /* This is set to zero if the progressmeter is not desired. */
 119 int showprogress = 1;
 120
 121 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 122 char *ssh_program = _PATH_SSH_PROGRAM;
 123
 124 /* This is used to store the pid of ssh_program */
 125 pid_t do_cmd_pid = -1;
 126
 127 static void
 128 killchild(int signo)
 129 {
 130         if (do_cmd_pid > 1) {
 131                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 132                 waitpid(do_cmd_pid, NULL, 0);
 133         }
 134
 135         if (signo)
 136                 _exit(1);
 137         exit(1);
 138 }
 139
 140 static int
 141 do_local_cmd(arglist *a)
 142 {
 143         u_int i;
 144         int status;
 145         pid_t pid;
 146
 147         if (a->num == 0)
 148                 fatal("do_local_cmd: no arguments");
 149
 150         if (verbose_mode) {
 151                 fprintf(stderr, "Executing:");
 152                 for (i = 0; i < a->num; i++)
 153                         fprintf(stderr, " %s", a->list[i]);
 154                 fprintf(stderr, "\n");
 155         }
 156         if ((pid = fork()) == -1)
 157                 fatal("do_local_cmd: fork: %s", strerror(errno));
 158
 159         if (pid == 0) {
 160                 execvp(a->list[0], a->list);
 161                 perror(a->list[0]);
 162                 exit(1);
 163         }
 164
 165         do_cmd_pid = pid;
 166         signal(SIGTERM, killchild);
 167         signal(SIGINT, killchild);
 168         signal(SIGHUP, killchild);
 169
 170         while (waitpid(pid, &status, 0) == -1)
 171                 if (errno != EINTR)
 172                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 173
 174         do_cmd_pid = -1;
 175
 176         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 177                 return (-1);
 178
 179         return (0);
 180 }
 181
 182 /*
 183  * This function executes the given command as the specified user on the
 184  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 185  * assigns the input and output file descriptors on success.
 186  */
 187
 188 int
 189 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 190 {
 191         int pin[2], pout[2], reserved[2];
 192
 193         if (verbose_mode)
 194                 fprintf(stderr,
 195                     "Executing: program %s host %s, user %s, command %s\n",
 196                     ssh_program, host,
 197                     remuser ? remuser : "(unspecified)", cmd);
 198
 199         /*
 200          * Reserve two descriptors so that the real pipes won't get
 201          * descriptors 0 and 1 because that will screw up dup2 below.
 202          */
 203         if (pipe(reserved) < 0)
 204                 fatal("pipe: %s", strerror(errno));
 205
 206         /* Create a socket pair for communicating with ssh. */
 207         if (pipe(pin) < 0)
 208                 fatal("pipe: %s", strerror(errno));
 209         if (pipe(pout) < 0)
 210                 fatal("pipe: %s", strerror(errno));
 211
 212         /* Free the reserved descriptors. */
 213         close(reserved[0]);
 214         close(reserved[1]);
 215
 216         /* Fork a child to execute the command on the remote host using ssh. */
 217         do_cmd_pid = fork();
 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                 replacearg(&args, 0, "%s", ssh_program);
 228                 if (remuser != NULL)
 229                         addargs(&args, "-l%s", remuser);
 230                 addargs(&args, "%s", host);
 231                 addargs(&args, "%s", cmd);
 232
 233                 execvp(ssh_program, args.list);
 234                 perror(ssh_program);
 235                 exit(1);
 236         } else if (do_cmd_pid == -1) {
 237                 fatal("fork: %s", strerror(errno));
 238         }
 239         /* Parent.  Close the other side, and return the local side. */
 240         close(pin[0]);
 241         *fdout = pin[1];
 242         close(pout[1]);
 243         *fdin = pout[0];
 244         signal(SIGTERM, killchild);
 245         signal(SIGINT, killchild);
 246         signal(SIGHUP, killchild);
 247         return 0;
 248 }
 249
 250 typedef struct {
 251         size_t cnt;
 252         char *buf;
 253 } BUF;
 254
 255 BUF *allocbuf(BUF *, int, int);
 256 void lostconn(int);
 257 int okname(char *);
 258 void run_err(const char *,...);
 259 void verifydir(char *);
 260
 261 struct passwd *pwd;
 262 uid_t userid;
 263 int errs, remin, remout;
 264 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 265
 266 #define CMDNEEDS        64
 267 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 268
 269 int response(void);
 270 void rsource(char *, struct stat *);
 271 void sink(int, char *[]);
 272 void source(int, char *[]);
 273 void tolocal(int, char *[]);
 274 void toremote(char *, int, char *[]);
 275 void usage(void);
 276
 277 int
 278 main(int argc, char **argv)
 279 {
 280         int ch, fflag, tflag, status, n;
 281         double speed;
 282         char *targ, *endp, **newargv;
 283         extern char *optarg;
 284         extern int optind;
 285
 286         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 287         sanitise_stdfd();
 288
 289         /* Copy argv, because we modify it */
 290         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 291         for (n = 0; n < argc; n++)
 292                 newargv[n] = xstrdup(argv[n]);
 293         argv = newargv;
 294
 295         __progname = ssh_get_progname(argv[0]);
 296
 297         memset(&args, '\0', sizeof(args));
 298         args.list = NULL;
 299         addargs(&args, "%s", ssh_program);
 300         addargs(&args, "-x");
 301         addargs(&args, "-oForwardAgent no");
 302         addargs(&args, "-oPermitLocalCommand no");
 303         addargs(&args, "-oClearAllForwardings yes");
 304
 305         fflag = tflag = 0;
 306         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 307                 switch (ch) {
 308                 /* User-visible flags. */
 309                 case '1':
 310                 case '2':
 311                 case '4':
 312                 case '6':
 313                 case 'C':
 314                         addargs(&args, "-%c", ch);
 315                         break;
 316                 case 'o':
 317                 case 'c':
 318                 case 'i':
 319                 case 'F':
 320                         addargs(&args, "-%c%s", ch, optarg);
 321                         break;
 322                 case 'P':
 323                         addargs(&args, "-p%s", optarg);
 324                         break;
 325                 case 'B':
 326                         addargs(&args, "-oBatchmode yes");
 327                         break;
 328                 case 'l':
 329                         speed = strtod(optarg, &endp);
 330                         if (speed <= 0 || *endp != '\0')
 331                                 usage();
 332                         limit_rate = speed * 1024;
 333                         break;
 334                 case 'p':
 335                         pflag = 1;
 336                         break;
 337                 case 'r':
 338                         iamrecursive = 1;
 339                         break;
 340                 case 'S':
 341                         ssh_program = xstrdup(optarg);
 342                         break;
 343                 case 'v':
 344                         addargs(&args, "-v");
 345                         verbose_mode = 1;
 346                         break;
 347                 case 'q':
 348                         addargs(&args, "-q");
 349                         showprogress = 0;
 350                         break;
 351
 352                 /* Server options. */
 353                 case 'd':
 354                         targetshouldbedirectory = 1;
 355                         break;
 356                 case 'f':       /* "from" */
 357                         iamremote = 1;
 358                         fflag = 1;
 359                         break;
 360                 case 't':       /* "to" */
 361                         iamremote = 1;
 362                         tflag = 1;
 363 #ifdef HAVE_CYGWIN
 364                         setmode(0, O_BINARY);
 365 #endif
 366                         break;
 367                 default:
 368                         usage();
 369                 }
 370         argc -= optind;
 371         argv += optind;
 372
 373         if ((pwd = getpwuid(userid = getuid())) == NULL)
 374                 fatal("unknown user %u", (u_int) userid);
 375
 376         if (!isatty(STDERR_FILENO))
 377                 showprogress = 0;
 378
 379         remin = STDIN_FILENO;
 380         remout = STDOUT_FILENO;
 381
 382         if (fflag) {
 383                 /* Follow "protocol", send data. */
 384                 (void) response();
 385                 source(argc, argv);
 386                 exit(errs != 0);
 387         }
 388         if (tflag) {
 389                 /* Receive data. */
 390                 sink(argc, argv);
 391                 exit(errs != 0);
 392         }
 393         if (argc < 2)
 394                 usage();
 395         if (argc > 2)
 396                 targetshouldbedirectory = 1;
 397
 398         remin = remout = -1;
 399         do_cmd_pid = -1;
 400         /* Command to be executed on remote system using "ssh". */
 401         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 402             verbose_mode ? " -v" : "",
 403             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 404             targetshouldbedirectory ? " -d" : "");
 405
 406         (void) signal(SIGPIPE, lostconn);
 407
 408         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 409                 toremote(targ, argc, argv);
 410         else {
 411                 if (targetshouldbedirectory)
 412                         verifydir(argv[argc - 1]);
 413                 tolocal(argc, argv);    /* Dest is local host. */
 414         }
 415         /*
 416          * Finally check the exit status of the ssh process, if one was forked
 417          * and no error has occured yet
 418          */
 419         if (do_cmd_pid != -1 && errs == 0) {
 420                 if (remin != -1)
 421                     (void) close(remin);
 422                 if (remout != -1)
 423                     (void) close(remout);
 424                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 425                         errs = 1;
 426                 else {
 427                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 428                                 errs = 1;
 429                 }
 430         }
 431         exit(errs != 0);
 432 }
 433
 434 void
 435 toremote(char *targ, int argc, char **argv)
 436 {
 437         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 438         arglist alist;
 439         int i;
 440
 441         memset(&alist, '\0', sizeof(alist));
 442         alist.list = NULL;
 443
 444         *targ++ = 0;
 445         if (*targ == 0)
 446                 targ = ".";
 447
 448         arg = xstrdup(argv[argc - 1]);
 449         if ((thost = strrchr(arg, '@'))) {
 450                 /* user@host */
 451                 *thost++ = 0;
 452                 tuser = arg;
 453                 if (*tuser == '\0')
 454                         tuser = NULL;
 455         } else {
 456                 thost = arg;
 457                 tuser = NULL;
 458         }
 459
 460         if (tuser != NULL && !okname(tuser)) {
 461                 xfree(arg);
 462                 return;
 463         }
 464
 465         for (i = 0; i < argc - 1; i++) {
 466                 src = colon(argv[i]);
 467                 if (src) {      /* remote to remote */
 468                         freeargs(&alist);
 469                         addargs(&alist, "%s", ssh_program);
 470                         if (verbose_mode)
 471                                 addargs(&alist, "-v");
 472                         addargs(&alist, "-x");
 473                         addargs(&alist, "-oClearAllForwardings yes");
 474                         addargs(&alist, "-n");
 475
 476                         *src++ = 0;
 477                         if (*src == 0)
 478                                 src = ".";
 479                         host = strrchr(argv[i], '@');
 480
 481                         if (host) {
 482                                 *host++ = 0;
 483                                 host = cleanhostname(host);
 484                                 suser = argv[i];
 485                                 if (*suser == '\0')
 486                                         suser = pwd->pw_name;
 487                                 else if (!okname(suser))
 488                                         continue;
 489                                 addargs(&alist, "-l");
 490                                 addargs(&alist, "%s", suser);
 491                         } else {
 492                                 host = cleanhostname(argv[i]);
 493                         }
 494                         addargs(&alist, "%s", host);
 495                         addargs(&alist, "%s", cmd);
 496                         addargs(&alist, "%s", src);
 497                         addargs(&alist, "%s%s%s:%s",
 498                             tuser ? tuser : "", tuser ? "@" : "",
 499                             thost, targ);
 500                         if (do_local_cmd(&alist) != 0)
 501                                 errs = 1;
 502                 } else {        /* local to remote */
 503                         if (remin == -1) {
 504                                 xasprintf(&bp, "%s -t %s", cmd, targ);
 505                                 host = cleanhostname(thost);
 506                                 if (do_cmd(host, tuser, bp, &remin,
 507                                     &remout) < 0)
 508                                         exit(1);
 509                                 if (response() < 0)
 510                                         exit(1);
 511                                 (void) xfree(bp);
 512                         }
 513                         source(1, argv + i);
 514                 }
 515         }
 516         xfree(arg);
 517 }
 518
 519 void
 520 tolocal(int argc, char **argv)
 521 {
 522         char *bp, *host, *src, *suser;
 523         arglist alist;
 524         int i;
 525
 526         memset(&alist, '\0', sizeof(alist));
 527         alist.list = NULL;
 528
 529         for (i = 0; i < argc - 1; i++) {
 530                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 531                         freeargs(&alist);
 532                         addargs(&alist, "%s", _PATH_CP);
 533                         if (iamrecursive)
 534                                 addargs(&alist, "-r");
 535                         if (pflag)
 536                                 addargs(&alist, "-p");
 537                         addargs(&alist, "%s", argv[i]);
 538                         addargs(&alist, "%s", argv[argc-1]);
 539                         if (do_local_cmd(&alist))
 540                                 ++errs;
 541                         continue;
 542                 }
 543                 *src++ = 0;
 544                 if (*src == 0)
 545                         src = ".";
 546                 if ((host = strrchr(argv[i], '@')) == NULL) {
 547                         host = argv[i];
 548                         suser = NULL;
 549                 } else {
 550                         *host++ = 0;
 551                         suser = argv[i];
 552                         if (*suser == '\0')
 553                                 suser = pwd->pw_name;
 554                 }
 555                 host = cleanhostname(host);
 556                 xasprintf(&bp, "%s -f %s", cmd, src);
 557                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 558                         (void) xfree(bp);
 559                         ++errs;
 560                         continue;
 561                 }
 562                 xfree(bp);
 563                 sink(1, argv + argc - 1);
 564                 (void) close(remin);
 565                 remin = remout = -1;
 566         }
 567 }
 568
 569 void
 570 source(int argc, char **argv)
 571 {
 572         struct stat stb;
 573         static BUF buffer;
 574         BUF *bp;
 575         off_t i, amt, statbytes;
 576         size_t result;
 577         int fd = -1, haderr, indx;
 578         char *last, *name, buf[2048];
 579         int len;
 580
 581         for (indx = 0; indx < argc; ++indx) {
 582                 name = argv[indx];
 583                 statbytes = 0;
 584                 len = strlen(name);
 585                 while (len > 1 && name[len-1] == '/')
 586                         name[--len] = '\0';
 587                 if (strchr(name, '\n') != NULL) {
 588                         run_err("%s: skipping, filename contains a newline",
 589                             name);
 590                         goto next;
 591                 }
 592                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 593                         goto syserr;
 594                 if (fstat(fd, &stb) < 0) {
 595 syserr:                 run_err("%s: %s", name, strerror(errno));
 596                         goto next;
 597                 }
 598                 switch (stb.st_mode & S_IFMT) {
 599                 case S_IFREG:
 600                         break;
 601                 case S_IFDIR:
 602                         if (iamrecursive) {
 603                                 rsource(name, &stb);
 604                                 goto next;
 605                         }
 606                         /* FALLTHROUGH */
 607                 default:
 608                         run_err("%s: not a regular file", name);
 609                         goto next;
 610                 }
 611                 if ((last = strrchr(name, '/')) == NULL)
 612                         last = name;
 613                 else
 614                         ++last;
 615                 curfile = last;
 616                 if (pflag) {
 617                         /*
 618                          * Make it compatible with possible future
 619                          * versions expecting microseconds.
 620                          */
 621                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 622                             (u_long) stb.st_mtime,
 623                             (u_long) stb.st_atime);
 624                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 625                         if (response() < 0)
 626                                 goto next;
 627                 }
 628 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 629                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 630                     (u_int) (stb.st_mode & FILEMODEMASK),
 631                     (long long)stb.st_size, last);
 632                 if (verbose_mode) {
 633                         fprintf(stderr, "Sending file modes: %s", buf);
 634                 }
 635                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 636                 if (response() < 0)
 637                         goto next;
 638                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 639 next:                   if (fd != -1) {
 640                                 (void) close(fd);
 641                                 fd = -1;
 642                         }
 643                         continue;
 644                 }
 645                 if (showprogress)
 646                         start_progress_meter(curfile, stb.st_size, &statbytes);
 647                 /* Keep writing after an error so that we stay sync'd up. */
 648                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 649                         amt = bp->cnt;
 650                         if (i + amt > stb.st_size)
 651                                 amt = stb.st_size - i;
 652                         if (!haderr) {
 653                                 result = atomicio(read, fd, bp->buf, amt);
 654                                 if (result != amt)
 655                                         haderr = errno;
 656                         }
 657                         if (haderr)
 658                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 659                         else {
 660                                 result = atomicio(vwrite, remout, bp->buf, amt);
 661                                 if (result != amt)
 662                                         haderr = errno;
 663                                 statbytes += result;
 664                         }
 665                         if (limit_rate)
 666                                 bwlimit(amt);
 667                 }
 668                 if (showprogress)
 669                         stop_progress_meter();
 670
 671                 if (fd != -1) {
 672                         if (close(fd) < 0 && !haderr)
 673                                 haderr = errno;
 674                         fd = -1;
 675                 }
 676                 if (!haderr)
 677                         (void) atomicio(vwrite, remout, "", 1);
 678                 else
 679                         run_err("%s: %s", name, strerror(haderr));
 680                 (void) response();
 681         }
 682 }
 683
 684 void
 685 rsource(char *name, struct stat *statp)
 686 {
 687         DIR *dirp;
 688         struct dirent *dp;
 689         char *last, *vect[1], path[1100];
 690
 691         if (!(dirp = opendir(name))) {
 692                 run_err("%s: %s", name, strerror(errno));
 693                 return;
 694         }
 695         last = strrchr(name, '/');
 696         if (last == 0)
 697                 last = name;
 698         else
 699                 last++;
 700         if (pflag) {
 701                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 702                     (u_long) statp->st_mtime,
 703                     (u_long) statp->st_atime);
 704                 (void) atomicio(vwrite, remout, path, strlen(path));
 705                 if (response() < 0) {
 706                         closedir(dirp);
 707                         return;
 708                 }
 709         }
 710         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 711             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 712         if (verbose_mode)
 713                 fprintf(stderr, "Entering directory: %s", path);
 714         (void) atomicio(vwrite, remout, path, strlen(path));
 715         if (response() < 0) {
 716                 closedir(dirp);
 717                 return;
 718         }
 719         while ((dp = readdir(dirp)) != NULL) {
 720                 if (dp->d_ino == 0)
 721                         continue;
 722                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 723                         continue;
 724                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 725                         run_err("%s/%s: name too long", name, dp->d_name);
 726                         continue;
 727                 }
 728                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 729                 vect[0] = path;
 730                 source(1, vect);
 731         }
 732         (void) closedir(dirp);
 733         (void) atomicio(vwrite, remout, "E\n", 2);
 734         (void) response();
 735 }
 736
 737 void
 738 bwlimit(int amount)
 739 {
 740         static struct timeval bwstart, bwend;
 741         static int lamt, thresh = 16384;
 742         u_int64_t waitlen;
 743         struct timespec ts, rm;
 744
 745         if (!timerisset(&bwstart)) {
 746                 gettimeofday(&bwstart, NULL);
 747                 return;
 748         }
 749
 750         lamt += amount;
 751         if (lamt < thresh)
 752                 return;
 753
 754         gettimeofday(&bwend, NULL);
 755         timersub(&bwend, &bwstart, &bwend);
 756         if (!timerisset(&bwend))
 757                 return;
 758
 759         lamt *= 8;
 760         waitlen = (double)1000000L * lamt / limit_rate;
 761
 762         bwstart.tv_sec = waitlen / 1000000L;
 763         bwstart.tv_usec = waitlen % 1000000L;
 764
 765         if (timercmp(&bwstart, &bwend, >)) {
 766                 timersub(&bwstart, &bwend, &bwend);
 767
 768                 /* Adjust the wait time */
 769                 if (bwend.tv_sec) {
 770                         thresh /= 2;
 771                         if (thresh < 2048)
 772                                 thresh = 2048;
 773                 } else if (bwend.tv_usec < 100) {
 774                         thresh *= 2;
 775                         if (thresh > 32768)
 776                                 thresh = 32768;
 777                 }
 778
 779                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 780                 while (nanosleep(&ts, &rm) == -1) {
 781                         if (errno != EINTR)
 782                                 break;
 783                         ts = rm;
 784                 }
 785         }
 786
 787         lamt = 0;
 788         gettimeofday(&bwstart, NULL);
 789 }
 790
 791 void
 792 sink(int argc, char **argv)
 793 {
 794         static BUF buffer;
 795         struct stat stb;
 796         enum {
 797                 YES, NO, DISPLAYED
 798         } wrerr;
 799         BUF *bp;
 800         off_t i;
 801         size_t j, count;
 802         int amt, exists, first, ofd;
 803         mode_t mode, omode, mask;
 804         off_t size, statbytes;
 805         int setimes, targisdir, wrerrno = 0;
 806         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 807         struct timeval tv[2];
 808
 809 #define atime   tv[0]
 810 #define mtime   tv[1]
 811 #define SCREWUP(str)    { why = str; goto screwup; }
 812
 813         setimes = targisdir = 0;
 814         mask = umask(0);
 815         if (!pflag)
 816                 (void) umask(mask);
 817         if (argc != 1) {
 818                 run_err("ambiguous target");
 819                 exit(1);
 820         }
 821         targ = *argv;
 822         if (targetshouldbedirectory)
 823                 verifydir(targ);
 824
 825         (void) atomicio(vwrite, remout, "", 1);
 826         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 827                 targisdir = 1;
 828         for (first = 1;; first = 0) {
 829                 cp = buf;
 830                 if (atomicio(read, remin, cp, 1) != 1)
 831                         return;
 832                 if (*cp++ == '\n')
 833                         SCREWUP("unexpected <newline>");
 834                 do {
 835                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 836                                 SCREWUP("lost connection");
 837                         *cp++ = ch;
 838                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 839                 *cp = 0;
 840                 if (verbose_mode)
 841                         fprintf(stderr, "Sink: %s", buf);
 842
 843                 if (buf[0] == '\01' || buf[0] == '\02') {
 844                         if (iamremote == 0)
 845                                 (void) atomicio(vwrite, STDERR_FILENO,
 846                                     buf + 1, strlen(buf + 1));
 847                         if (buf[0] == '\02')
 848                                 exit(1);
 849                         ++errs;
 850                         continue;
 851                 }
 852                 if (buf[0] == 'E') {
 853                         (void) atomicio(vwrite, remout, "", 1);
 854                         return;
 855                 }
 856                 if (ch == '\n')
 857                         *--cp = 0;
 858
 859                 cp = buf;
 860                 if (*cp == 'T') {
 861                         setimes++;
 862                         cp++;
 863                         mtime.tv_sec = strtol(cp, &cp, 10);
 864                         if (!cp || *cp++ != ' ')
 865                                 SCREWUP("mtime.sec not delimited");
 866                         mtime.tv_usec = strtol(cp, &cp, 10);
 867                         if (!cp || *cp++ != ' ')
 868                                 SCREWUP("mtime.usec not delimited");
 869                         atime.tv_sec = strtol(cp, &cp, 10);
 870                         if (!cp || *cp++ != ' ')
 871                                 SCREWUP("atime.sec not delimited");
 872                         atime.tv_usec = strtol(cp, &cp, 10);
 873                         if (!cp || *cp++ != '\0')
 874                                 SCREWUP("atime.usec not delimited");
 875                         (void) atomicio(vwrite, remout, "", 1);
 876                         continue;
 877                 }
 878                 if (*cp != 'C' && *cp != 'D') {
 879                         /*
 880                          * Check for the case "rcp remote:foo\* local:bar".
 881                          * In this case, the line "No match." can be returned
 882                          * by the shell before the rcp command on the remote is
 883                          * executed so the ^Aerror_message convention isn't
 884                          * followed.
 885                          */
 886                         if (first) {
 887                                 run_err("%s", cp);
 888                                 exit(1);
 889                         }
 890                         SCREWUP("expected control record");
 891                 }
 892                 mode = 0;
 893                 for (++cp; cp < buf + 5; cp++) {
 894                         if (*cp < '0' || *cp > '7')
 895                                 SCREWUP("bad mode");
 896                         mode = (mode << 3) | (*cp - '0');
 897                 }
 898                 if (*cp++ != ' ')
 899                         SCREWUP("mode not delimited");
 900
 901                 for (size = 0; isdigit(*cp);)
 902                         size = size * 10 + (*cp++ - '0');
 903                 if (*cp++ != ' ')
 904                         SCREWUP("size not delimited");
 905                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 906                         run_err("error: unexpected filename: %s", cp);
 907                         exit(1);
 908                 }
 909                 if (targisdir) {
 910                         static char *namebuf;
 911                         static size_t cursize;
 912                         size_t need;
 913
 914                         need = strlen(targ) + strlen(cp) + 250;
 915                         if (need > cursize) {
 916                                 if (namebuf)
 917                                         xfree(namebuf);
 918                                 namebuf = xmalloc(need);
 919                                 cursize = need;
 920                         }
 921                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 922                             strcmp(targ, "/") ? "/" : "", cp);
 923                         np = namebuf;
 924                 } else
 925                         np = targ;
 926                 curfile = cp;
 927                 exists = stat(np, &stb) == 0;
 928                 if (buf[0] == 'D') {
 929                         int mod_flag = pflag;
 930                         if (!iamrecursive)
 931                                 SCREWUP("received directory without -r");
 932                         if (exists) {
 933                                 if (!S_ISDIR(stb.st_mode)) {
 934                                         errno = ENOTDIR;
 935                                         goto bad;
 936                                 }
 937                                 if (pflag)
 938                                         (void) chmod(np, mode);
 939                         } else {
 940                                 /* Handle copying from a read-only
 941                                    directory */
 942                                 mod_flag = 1;
 943                                 if (mkdir(np, mode | S_IRWXU) < 0)
 944                                         goto bad;
 945                         }
 946                         vect[0] = xstrdup(np);
 947                         sink(1, vect);
 948                         if (setimes) {
 949                                 setimes = 0;
 950                                 if (utimes(vect[0], tv) < 0)
 951                                         run_err("%s: set times: %s",
 952                                             vect[0], strerror(errno));
 953                         }
 954                         if (mod_flag)
 955                                 (void) chmod(vect[0], mode);
 956                         if (vect[0])
 957                                 xfree(vect[0]);
 958                         continue;
 959                 }
 960                 omode = mode;
 961                 mode |= S_IWRITE;
 962                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 963 bad:                    run_err("%s: %s", np, strerror(errno));
 964                         continue;
 965                 }
 966                 (void) atomicio(vwrite, remout, "", 1);
 967                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 968                         (void) close(ofd);
 969                         continue;
 970                 }
 971                 cp = bp->buf;
 972                 wrerr = NO;
 973
 974                 statbytes = 0;
 975                 if (showprogress)
 976                         start_progress_meter(curfile, size, &statbytes);
 977                 for (count = i = 0; i < size; i += 4096) {
 978                         amt = 4096;
 979                         if (i + amt > size)
 980                                 amt = size - i;
 981                         count += amt;
 982                         do {
 983                                 j = atomicio(read, remin, cp, amt);
 984                                 if (j == 0) {
 985                                         run_err("%s", j ? strerror(errno) :
 986                                             "dropped connection");
 987                                         exit(1);
 988                                 }
 989                                 amt -= j;
 990                                 cp += j;
 991                                 statbytes += j;
 992                         } while (amt > 0);
 993
 994                         if (limit_rate)
 995                                 bwlimit(4096);
 996
 997                         if (count == bp->cnt) {
 998                                 /* Keep reading so we stay sync'd up. */
 999                                 if (wrerr == NO) {
1000                                         if (atomicio(vwrite, ofd, bp->buf,
1001                                             count) != count) {
1002                                                 wrerr = YES;
1003                                                 wrerrno = errno;
1004                                         }
1005                                 }
1006                                 count = 0;
1007                                 cp = bp->buf;
1008                         }
1009                 }
1010                 if (showprogress)
1011                         stop_progress_meter();
1012                 if (count != 0 && wrerr == NO &&
1013                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1014                         wrerr = YES;
1015                         wrerrno = errno;
1016                 }
1017                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
1018                         run_err("%s: truncate: %s", np, strerror(errno));
1019                         wrerr = DISPLAYED;
1020                 }
1021                 if (pflag) {
1022                         if (exists || omode != mode)
1023 #ifdef HAVE_FCHMOD
1024                                 if (fchmod(ofd, omode)) {
1025 #else /* HAVE_FCHMOD */
1026                                 if (chmod(np, omode)) {
1027 #endif /* HAVE_FCHMOD */
1028                                         run_err("%s: set mode: %s",
1029                                             np, strerror(errno));
1030                                         wrerr = DISPLAYED;
1031                                 }
1032                 } else {
1033                         if (!exists && omode != mode)
1034 #ifdef HAVE_FCHMOD
1035                                 if (fchmod(ofd, omode & ~mask)) {
1036 #else /* HAVE_FCHMOD */
1037                                 if (chmod(np, omode & ~mask)) {
1038 #endif /* HAVE_FCHMOD */
1039                                         run_err("%s: set mode: %s",
1040                                             np, strerror(errno));
1041                                         wrerr = DISPLAYED;
1042                                 }
1043                 }
1044                 if (close(ofd) == -1) {
1045                         wrerr = YES;
1046                         wrerrno = errno;
1047                 }
1048                 (void) response();
1049                 if (setimes && wrerr == NO) {
1050                         setimes = 0;
1051                         if (utimes(np, tv) < 0) {
1052                                 run_err("%s: set times: %s",
1053                                     np, strerror(errno));
1054                                 wrerr = DISPLAYED;
1055                         }
1056                 }
1057                 switch (wrerr) {
1058                 case YES:
1059                         run_err("%s: %s", np, strerror(wrerrno));
1060                         break;
1061                 case NO:
1062                         (void) atomicio(vwrite, remout, "", 1);
1063                         break;
1064                 case DISPLAYED:
1065                         break;
1066                 }
1067         }
1068 screwup:
1069         run_err("protocol error: %s", why);
1070         exit(1);
1071 }
1072
1073 int
1074 response(void)
1075 {
1076         char ch, *cp, resp, rbuf[2048];
1077
1078         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1079                 lostconn(0);
1080
1081         cp = rbuf;
1082         switch (resp) {
1083         case 0:         /* ok */
1084                 return (0);
1085         default:
1086                 *cp++ = resp;
1087                 /* FALLTHROUGH */
1088         case 1:         /* error, followed by error msg */
1089         case 2:         /* fatal error, "" */
1090                 do {
1091                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1092                                 lostconn(0);
1093                         *cp++ = ch;
1094                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1095
1096                 if (!iamremote)
1097                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1098                 ++errs;
1099                 if (resp == 1)
1100                         return (-1);
1101                 exit(1);
1102         }
1103         /* NOTREACHED */
1104 }
1105
1106 void
1107 usage(void)
1108 {
1109         (void) fprintf(stderr,
1110             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1111             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1112             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1113         exit(1);
1114 }
1115
1116 void
1117 run_err(const char *fmt,...)
1118 {
1119         static FILE *fp;
1120         va_list ap;
1121
1122         ++errs;
1123         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1124                 (void) fprintf(fp, "%c", 0x01);
1125                 (void) fprintf(fp, "scp: ");
1126                 va_start(ap, fmt);
1127                 (void) vfprintf(fp, fmt, ap);
1128                 va_end(ap);
1129                 (void) fprintf(fp, "\n");
1130                 (void) fflush(fp);
1131         }
1132
1133         if (!iamremote) {
1134                 va_start(ap, fmt);
1135                 vfprintf(stderr, fmt, ap);
1136                 va_end(ap);
1137                 fprintf(stderr, "\n");
1138         }
1139 }
1140
1141 void
1142 verifydir(char *cp)
1143 {
1144         struct stat stb;
1145
1146         if (!stat(cp, &stb)) {
1147                 if (S_ISDIR(stb.st_mode))
1148                         return;
1149                 errno = ENOTDIR;
1150         }
1151         run_err("%s: %s", cp, strerror(errno));
1152         killchild(0);
1153 }
1154
1155 int
1156 okname(char *cp0)
1157 {
1158         int c;
1159         char *cp;
1160
1161         cp = cp0;
1162         do {
1163                 c = (int)*cp;
1164                 if (c & 0200)
1165                         goto bad;
1166                 if (!isalpha(c) && !isdigit(c)) {
1167                         switch (c) {
1168                         case '\'':
1169                         case '"':
1170                         case '`':
1171                         case ' ':
1172                         case '#':
1173                                 goto bad;
1174                         default:
1175                                 break;
1176                         }
1177                 }
1178         } while (*++cp);
1179         return (1);
1180
1181 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1182         return (0);
1183 }
1184
1185 BUF *
1186 allocbuf(BUF *bp, int fd, int blksize)
1187 {
1188         size_t size;
1189 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1190         struct stat stb;
1191
1192         if (fstat(fd, &stb) < 0) {
1193                 run_err("fstat: %s", strerror(errno));
1194                 return (0);
1195         }
1196         size = roundup(stb.st_blksize, blksize);
1197         if (size == 0)
1198                 size = blksize;
1199 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1200         size = blksize;
1201 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1202         if (bp->cnt >= size)
1203                 return (bp);
1204         if (bp->buf == NULL)
1205                 bp->buf = xmalloc(size);
1206         else
1207                 bp->buf = xrealloc(bp->buf, 1, size);
1208         memset(bp->buf, 0, size);
1209         bp->cnt = size;
1210         return (bp);
1211 }
1212
1213 void
1214 lostconn(int signo)
1215 {
1216         if (!iamremote)
1217                 write(STDERR_FILENO, "lost connection\n", 16);
1218         if (signo)
1219                 _exit(1);
1220         else
1221                 exit(1);
1222 }