scp.c

   1 /* $OpenBSD: scp.c,v 1.155 2006/08/03 03:34:42 deraadt 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 #include <sys/param.h>
  78 #ifdef HAVE_SYS_STAT_H
  79 # include <sys/stat.h>
  80 #endif
  81 #ifdef HAVE_SYS_TIME_H
  82 # include <sys/time.h>
  83 #endif
  84 #include <sys/wait.h>
  85 #include <sys/uio.h>
  86
  87 #include <ctype.h>
  88 #include <dirent.h>
  89 #include <errno.h>
  90 #include <fcntl.h>
  91 #include <pwd.h>
  92 #include <signal.h>
  93 #include <stdarg.h>
  94 #include <stdio.h>
  95 #include <stdlib.h>
  96 #include <string.h>
  97 #include <time.h>
  98 #include <unistd.h>
  99
 100 #include "xmalloc.h"
 101 #include "atomicio.h"
 102 #include "pathnames.h"
 103 #include "log.h"
 104 #include "misc.h"
 105 #include "progressmeter.h"
 106
 107 extern char *__progname;
 108
 109 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 110
 111 void bwlimit(int);
 112
 113 /* Struct for addargs */
 114 arglist args;
 115
 116 /* Bandwidth limit */
 117 off_t limit_rate = 0;
 118
 119 /* Name of current file being transferred. */
 120 char *curfile;
 121
 122 /* This is set to non-zero to enable verbose mode. */
 123 int verbose_mode = 0;
 124
 125 /* This is set to zero if the progressmeter is not desired. */
 126 int showprogress = 1;
 127
 128 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 129 char *ssh_program = _PATH_SSH_PROGRAM;
 130
 131 /* This is used to store the pid of ssh_program */
 132 pid_t do_cmd_pid = -1;
 133
 134 static void
 135 killchild(int signo)
 136 {
 137         if (do_cmd_pid > 1) {
 138                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 139                 waitpid(do_cmd_pid, NULL, 0);
 140         }
 141
 142         if (signo)
 143                 _exit(1);
 144         exit(1);
 145 }
 146
 147 static int
 148 do_local_cmd(arglist *a)
 149 {
 150         u_int i;
 151         int status;
 152         pid_t pid;
 153
 154         if (a->num == 0)
 155                 fatal("do_local_cmd: no arguments");
 156
 157         if (verbose_mode) {
 158                 fprintf(stderr, "Executing:");
 159                 for (i = 0; i < a->num; i++)
 160                         fprintf(stderr, " %s", a->list[i]);
 161                 fprintf(stderr, "\n");
 162         }
 163         if ((pid = fork()) == -1)
 164                 fatal("do_local_cmd: fork: %s", strerror(errno));
 165
 166         if (pid == 0) {
 167                 execvp(a->list[0], a->list);
 168                 perror(a->list[0]);
 169                 exit(1);
 170         }
 171
 172         do_cmd_pid = pid;
 173         signal(SIGTERM, killchild);
 174         signal(SIGINT, killchild);
 175         signal(SIGHUP, killchild);
 176
 177         while (waitpid(pid, &status, 0) == -1)
 178                 if (errno != EINTR)
 179                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 180
 181         do_cmd_pid = -1;
 182
 183         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 184                 return (-1);
 185
 186         return (0);
 187 }
 188
 189 /*
 190  * This function executes the given command as the specified user on the
 191  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 192  * assigns the input and output file descriptors on success.
 193  */
 194
 195 int
 196 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 197 {
 198         int pin[2], pout[2], reserved[2];
 199
 200         if (verbose_mode)
 201                 fprintf(stderr,
 202                     "Executing: program %s host %s, user %s, command %s\n",
 203                     ssh_program, host,
 204                     remuser ? remuser : "(unspecified)", cmd);
 205
 206         /*
 207          * Reserve two descriptors so that the real pipes won't get
 208          * descriptors 0 and 1 because that will screw up dup2 below.
 209          */
 210         if (pipe(reserved) < 0)
 211                 fatal("pipe: %s", strerror(errno));
 212
 213         /* Create a socket pair for communicating with ssh. */
 214         if (pipe(pin) < 0)
 215                 fatal("pipe: %s", strerror(errno));
 216         if (pipe(pout) < 0)
 217                 fatal("pipe: %s", strerror(errno));
 218
 219         /* Free the reserved descriptors. */
 220         close(reserved[0]);
 221         close(reserved[1]);
 222
 223         /* Fork a child to execute the command on the remote host using ssh. */
 224         do_cmd_pid = fork();
 225         if (do_cmd_pid == 0) {
 226                 /* Child. */
 227                 close(pin[1]);
 228                 close(pout[0]);
 229                 dup2(pin[0], 0);
 230                 dup2(pout[1], 1);
 231                 close(pin[0]);
 232                 close(pout[1]);
 233
 234                 replacearg(&args, 0, "%s", ssh_program);
 235                 if (remuser != NULL)
 236                         addargs(&args, "-l%s", remuser);
 237                 addargs(&args, "%s", host);
 238                 addargs(&args, "%s", cmd);
 239
 240                 execvp(ssh_program, args.list);
 241                 perror(ssh_program);
 242                 exit(1);
 243         } else if (do_cmd_pid == -1) {
 244                 fatal("fork: %s", strerror(errno));
 245         }
 246         /* Parent.  Close the other side, and return the local side. */
 247         close(pin[0]);
 248         *fdout = pin[1];
 249         close(pout[1]);
 250         *fdin = pout[0];
 251         signal(SIGTERM, killchild);
 252         signal(SIGINT, killchild);
 253         signal(SIGHUP, killchild);
 254         return 0;
 255 }
 256
 257 typedef struct {
 258         size_t cnt;
 259         char *buf;
 260 } BUF;
 261
 262 BUF *allocbuf(BUF *, int, int);
 263 void lostconn(int);
 264 int okname(char *);
 265 void run_err(const char *,...);
 266 void verifydir(char *);
 267
 268 struct passwd *pwd;
 269 uid_t userid;
 270 int errs, remin, remout;
 271 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 272
 273 #define CMDNEEDS        64
 274 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 275
 276 int response(void);
 277 void rsource(char *, struct stat *);
 278 void sink(int, char *[]);
 279 void source(int, char *[]);
 280 void tolocal(int, char *[]);
 281 void toremote(char *, int, char *[]);
 282 void usage(void);
 283
 284 int
 285 main(int argc, char **argv)
 286 {
 287         int ch, fflag, tflag, status, n;
 288         double speed;
 289         char *targ, *endp, **newargv;
 290         extern char *optarg;
 291         extern int optind;
 292
 293         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 294         sanitise_stdfd();
 295
 296         /* Copy argv, because we modify it */
 297         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 298         for (n = 0; n < argc; n++)
 299                 newargv[n] = xstrdup(argv[n]);
 300         argv = newargv;
 301
 302         __progname = ssh_get_progname(argv[0]);
 303
 304         memset(&args, '\0', sizeof(args));
 305         args.list = NULL;
 306         addargs(&args, "%s", ssh_program);
 307         addargs(&args, "-x");
 308         addargs(&args, "-oForwardAgent no");
 309         addargs(&args, "-oPermitLocalCommand no");
 310         addargs(&args, "-oClearAllForwardings yes");
 311
 312         fflag = tflag = 0;
 313         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 314                 switch (ch) {
 315                 /* User-visible flags. */
 316                 case '1':
 317                 case '2':
 318                 case '4':
 319                 case '6':
 320                 case 'C':
 321                         addargs(&args, "-%c", ch);
 322                         break;
 323                 case 'o':
 324                 case 'c':
 325                 case 'i':
 326                 case 'F':
 327                         addargs(&args, "-%c%s", ch, optarg);
 328                         break;
 329                 case 'P':
 330                         addargs(&args, "-p%s", optarg);
 331                         break;
 332                 case 'B':
 333                         addargs(&args, "-oBatchmode yes");
 334                         break;
 335                 case 'l':
 336                         speed = strtod(optarg, &endp);
 337                         if (speed <= 0 || *endp != '\0')
 338                                 usage();
 339                         limit_rate = speed * 1024;
 340                         break;
 341                 case 'p':
 342                         pflag = 1;
 343                         break;
 344                 case 'r':
 345                         iamrecursive = 1;
 346                         break;
 347                 case 'S':
 348                         ssh_program = xstrdup(optarg);
 349                         break;
 350                 case 'v':
 351                         addargs(&args, "-v");
 352                         verbose_mode = 1;
 353                         break;
 354                 case 'q':
 355                         addargs(&args, "-q");
 356                         showprogress = 0;
 357                         break;
 358
 359                 /* Server options. */
 360                 case 'd':
 361                         targetshouldbedirectory = 1;
 362                         break;
 363                 case 'f':       /* "from" */
 364                         iamremote = 1;
 365                         fflag = 1;
 366                         break;
 367                 case 't':       /* "to" */
 368                         iamremote = 1;
 369                         tflag = 1;
 370 #ifdef HAVE_CYGWIN
 371                         setmode(0, O_BINARY);
 372 #endif
 373                         break;
 374                 default:
 375                         usage();
 376                 }
 377         argc -= optind;
 378         argv += optind;
 379
 380         if ((pwd = getpwuid(userid = getuid())) == NULL)
 381                 fatal("unknown user %u", (u_int) userid);
 382
 383         if (!isatty(STDERR_FILENO))
 384                 showprogress = 0;
 385
 386         remin = STDIN_FILENO;
 387         remout = STDOUT_FILENO;
 388
 389         if (fflag) {
 390                 /* Follow "protocol", send data. */
 391                 (void) response();
 392                 source(argc, argv);
 393                 exit(errs != 0);
 394         }
 395         if (tflag) {
 396                 /* Receive data. */
 397                 sink(argc, argv);
 398                 exit(errs != 0);
 399         }
 400         if (argc < 2)
 401                 usage();
 402         if (argc > 2)
 403                 targetshouldbedirectory = 1;
 404
 405         remin = remout = -1;
 406         do_cmd_pid = -1;
 407         /* Command to be executed on remote system using "ssh". */
 408         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 409             verbose_mode ? " -v" : "",
 410             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 411             targetshouldbedirectory ? " -d" : "");
 412
 413         (void) signal(SIGPIPE, lostconn);
 414
 415         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 416                 toremote(targ, argc, argv);
 417         else {
 418                 if (targetshouldbedirectory)
 419                         verifydir(argv[argc - 1]);
 420                 tolocal(argc, argv);    /* Dest is local host. */
 421         }
 422         /*
 423          * Finally check the exit status of the ssh process, if one was forked
 424          * and no error has occured yet
 425          */
 426         if (do_cmd_pid != -1 && errs == 0) {
 427                 if (remin != -1)
 428                     (void) close(remin);
 429                 if (remout != -1)
 430                     (void) close(remout);
 431                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 432                         errs = 1;
 433                 else {
 434                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 435                                 errs = 1;
 436                 }
 437         }
 438         exit(errs != 0);
 439 }
 440
 441 void
 442 toremote(char *targ, int argc, char **argv)
 443 {
 444         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 445         arglist alist;
 446         int i;
 447
 448         memset(&alist, '\0', sizeof(alist));
 449         alist.list = NULL;
 450
 451         *targ++ = 0;
 452         if (*targ == 0)
 453                 targ = ".";
 454
 455         arg = xstrdup(argv[argc - 1]);
 456         if ((thost = strrchr(arg, '@'))) {
 457                 /* user@host */
 458                 *thost++ = 0;
 459                 tuser = arg;
 460                 if (*tuser == '\0')
 461                         tuser = NULL;
 462         } else {
 463                 thost = arg;
 464                 tuser = NULL;
 465         }
 466
 467         if (tuser != NULL && !okname(tuser)) {
 468                 xfree(arg);
 469                 return;
 470         }
 471
 472         for (i = 0; i < argc - 1; i++) {
 473                 src = colon(argv[i]);
 474                 if (src) {      /* remote to remote */
 475                         freeargs(&alist);
 476                         addargs(&alist, "%s", ssh_program);
 477                         if (verbose_mode)
 478                                 addargs(&alist, "-v");
 479                         addargs(&alist, "-x");
 480                         addargs(&alist, "-oClearAllForwardings yes");
 481                         addargs(&alist, "-n");
 482
 483                         *src++ = 0;
 484                         if (*src == 0)
 485                                 src = ".";
 486                         host = strrchr(argv[i], '@');
 487
 488                         if (host) {
 489                                 *host++ = 0;
 490                                 host = cleanhostname(host);
 491                                 suser = argv[i];
 492                                 if (*suser == '\0')
 493                                         suser = pwd->pw_name;
 494                                 else if (!okname(suser))
 495                                         continue;
 496                                 addargs(&alist, "-l");
 497                                 addargs(&alist, "%s", suser);
 498                         } else {
 499                                 host = cleanhostname(argv[i]);
 500                         }
 501                         addargs(&alist, "%s", host);
 502                         addargs(&alist, "%s", cmd);
 503                         addargs(&alist, "%s", src);
 504                         addargs(&alist, "%s%s%s:%s",
 505                             tuser ? tuser : "", tuser ? "@" : "",
 506                             thost, targ);
 507                         if (do_local_cmd(&alist) != 0)
 508                                 errs = 1;
 509                 } else {        /* local to remote */
 510                         if (remin == -1) {
 511                                 xasprintf(&bp, "%s -t %s", cmd, targ);
 512                                 host = cleanhostname(thost);
 513                                 if (do_cmd(host, tuser, bp, &remin,
 514                                     &remout) < 0)
 515                                         exit(1);
 516                                 if (response() < 0)
 517                                         exit(1);
 518                                 (void) xfree(bp);
 519                         }
 520                         source(1, argv + i);
 521                 }
 522         }
 523         xfree(arg);
 524 }
 525
 526 void
 527 tolocal(int argc, char **argv)
 528 {
 529         char *bp, *host, *src, *suser;
 530         arglist alist;
 531         int i;
 532
 533         memset(&alist, '\0', sizeof(alist));
 534         alist.list = NULL;
 535
 536         for (i = 0; i < argc - 1; i++) {
 537                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 538                         freeargs(&alist);
 539                         addargs(&alist, "%s", _PATH_CP);
 540                         if (iamrecursive)
 541                                 addargs(&alist, "-r");
 542                         if (pflag)
 543                                 addargs(&alist, "-p");
 544                         addargs(&alist, "%s", argv[i]);
 545                         addargs(&alist, "%s", argv[argc-1]);
 546                         if (do_local_cmd(&alist))
 547                                 ++errs;
 548                         continue;
 549                 }
 550                 *src++ = 0;
 551                 if (*src == 0)
 552                         src = ".";
 553                 if ((host = strrchr(argv[i], '@')) == NULL) {
 554                         host = argv[i];
 555                         suser = NULL;
 556                 } else {
 557                         *host++ = 0;
 558                         suser = argv[i];
 559                         if (*suser == '\0')
 560                                 suser = pwd->pw_name;
 561                 }
 562                 host = cleanhostname(host);
 563                 xasprintf(&bp, "%s -f %s", cmd, src);
 564                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 565                         (void) xfree(bp);
 566                         ++errs;
 567                         continue;
 568                 }
 569                 xfree(bp);
 570                 sink(1, argv + argc - 1);
 571                 (void) close(remin);
 572                 remin = remout = -1;
 573         }
 574 }
 575
 576 void
 577 source(int argc, char **argv)
 578 {
 579         struct stat stb;
 580         static BUF buffer;
 581         BUF *bp;
 582         off_t i, amt, statbytes;
 583         size_t result;
 584         int fd = -1, haderr, indx;
 585         char *last, *name, buf[2048];
 586         int len;
 587
 588         for (indx = 0; indx < argc; ++indx) {
 589                 name = argv[indx];
 590                 statbytes = 0;
 591                 len = strlen(name);
 592                 while (len > 1 && name[len-1] == '/')
 593                         name[--len] = '\0';
 594                 if (strchr(name, '\n') != NULL) {
 595                         run_err("%s: skipping, filename contains a newline",
 596                             name);
 597                         goto next;
 598                 }
 599                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 600                         goto syserr;
 601                 if (fstat(fd, &stb) < 0) {
 602 syserr:                 run_err("%s: %s", name, strerror(errno));
 603                         goto next;
 604                 }
 605                 switch (stb.st_mode & S_IFMT) {
 606                 case S_IFREG:
 607                         break;
 608                 case S_IFDIR:
 609                         if (iamrecursive) {
 610                                 rsource(name, &stb);
 611                                 goto next;
 612                         }
 613                         /* FALLTHROUGH */
 614                 default:
 615                         run_err("%s: not a regular file", name);
 616                         goto next;
 617                 }
 618                 if ((last = strrchr(name, '/')) == NULL)
 619                         last = name;
 620                 else
 621                         ++last;
 622                 curfile = last;
 623                 if (pflag) {
 624                         /*
 625                          * Make it compatible with possible future
 626                          * versions expecting microseconds.
 627                          */
 628                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 629                             (u_long) stb.st_mtime,
 630                             (u_long) stb.st_atime);
 631                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 632                         if (response() < 0)
 633                                 goto next;
 634                 }
 635 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 636                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 637                     (u_int) (stb.st_mode & FILEMODEMASK),
 638                     (long long)stb.st_size, last);
 639                 if (verbose_mode) {
 640                         fprintf(stderr, "Sending file modes: %s", buf);
 641                 }
 642                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 643                 if (response() < 0)
 644                         goto next;
 645                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 646 next:                   if (fd != -1) {
 647                                 (void) close(fd);
 648                                 fd = -1;
 649                         }
 650                         continue;
 651                 }
 652                 if (showprogress)
 653                         start_progress_meter(curfile, stb.st_size, &statbytes);
 654                 /* Keep writing after an error so that we stay sync'd up. */
 655                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 656                         amt = bp->cnt;
 657                         if (i + amt > stb.st_size)
 658                                 amt = stb.st_size - i;
 659                         if (!haderr) {
 660                                 result = atomicio(read, fd, bp->buf, amt);
 661                                 if (result != amt)
 662                                         haderr = errno;
 663                         }
 664                         if (haderr)
 665                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 666                         else {
 667                                 result = atomicio(vwrite, remout, bp->buf, amt);
 668                                 if (result != amt)
 669                                         haderr = errno;
 670                                 statbytes += result;
 671                         }
 672                         if (limit_rate)
 673                                 bwlimit(amt);
 674                 }
 675                 if (showprogress)
 676                         stop_progress_meter();
 677
 678                 if (fd != -1) {
 679                         if (close(fd) < 0 && !haderr)
 680                                 haderr = errno;
 681                         fd = -1;
 682                 }
 683                 if (!haderr)
 684                         (void) atomicio(vwrite, remout, "", 1);
 685                 else
 686                         run_err("%s: %s", name, strerror(haderr));
 687                 (void) response();
 688         }
 689 }
 690
 691 void
 692 rsource(char *name, struct stat *statp)
 693 {
 694         DIR *dirp;
 695         struct dirent *dp;
 696         char *last, *vect[1], path[1100];
 697
 698         if (!(dirp = opendir(name))) {
 699                 run_err("%s: %s", name, strerror(errno));
 700                 return;
 701         }
 702         last = strrchr(name, '/');
 703         if (last == 0)
 704                 last = name;
 705         else
 706                 last++;
 707         if (pflag) {
 708                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 709                     (u_long) statp->st_mtime,
 710                     (u_long) statp->st_atime);
 711                 (void) atomicio(vwrite, remout, path, strlen(path));
 712                 if (response() < 0) {
 713                         closedir(dirp);
 714                         return;
 715                 }
 716         }
 717         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 718             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 719         if (verbose_mode)
 720                 fprintf(stderr, "Entering directory: %s", path);
 721         (void) atomicio(vwrite, remout, path, strlen(path));
 722         if (response() < 0) {
 723                 closedir(dirp);
 724                 return;
 725         }
 726         while ((dp = readdir(dirp)) != NULL) {
 727                 if (dp->d_ino == 0)
 728                         continue;
 729                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 730                         continue;
 731                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 732                         run_err("%s/%s: name too long", name, dp->d_name);
 733                         continue;
 734                 }
 735                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 736                 vect[0] = path;
 737                 source(1, vect);
 738         }
 739         (void) closedir(dirp);
 740         (void) atomicio(vwrite, remout, "E\n", 2);
 741         (void) response();
 742 }
 743
 744 void
 745 bwlimit(int amount)
 746 {
 747         static struct timeval bwstart, bwend;
 748         static int lamt, thresh = 16384;
 749         u_int64_t waitlen;
 750         struct timespec ts, rm;
 751
 752         if (!timerisset(&bwstart)) {
 753                 gettimeofday(&bwstart, NULL);
 754                 return;
 755         }
 756
 757         lamt += amount;
 758         if (lamt < thresh)
 759                 return;
 760
 761         gettimeofday(&bwend, NULL);
 762         timersub(&bwend, &bwstart, &bwend);
 763         if (!timerisset(&bwend))
 764                 return;
 765
 766         lamt *= 8;
 767         waitlen = (double)1000000L * lamt / limit_rate;
 768
 769         bwstart.tv_sec = waitlen / 1000000L;
 770         bwstart.tv_usec = waitlen % 1000000L;
 771
 772         if (timercmp(&bwstart, &bwend, >)) {
 773                 timersub(&bwstart, &bwend, &bwend);
 774
 775                 /* Adjust the wait time */
 776                 if (bwend.tv_sec) {
 777                         thresh /= 2;
 778                         if (thresh < 2048)
 779                                 thresh = 2048;
 780                 } else if (bwend.tv_usec < 100) {
 781                         thresh *= 2;
 782                         if (thresh > 32768)
 783                                 thresh = 32768;
 784                 }
 785
 786                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 787                 while (nanosleep(&ts, &rm) == -1) {
 788                         if (errno != EINTR)
 789                                 break;
 790                         ts = rm;
 791                 }
 792         }
 793
 794         lamt = 0;
 795         gettimeofday(&bwstart, NULL);
 796 }
 797
 798 void
 799 sink(int argc, char **argv)
 800 {
 801         static BUF buffer;
 802         struct stat stb;
 803         enum {
 804                 YES, NO, DISPLAYED
 805         } wrerr;
 806         BUF *bp;
 807         off_t i;
 808         size_t j, count;
 809         int amt, exists, first, ofd;
 810         mode_t mode, omode, mask;
 811         off_t size, statbytes;
 812         int setimes, targisdir, wrerrno = 0;
 813         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 814         struct timeval tv[2];
 815
 816 #define atime   tv[0]
 817 #define mtime   tv[1]
 818 #define SCREWUP(str)    { why = str; goto screwup; }
 819
 820         setimes = targisdir = 0;
 821         mask = umask(0);
 822         if (!pflag)
 823                 (void) umask(mask);
 824         if (argc != 1) {
 825                 run_err("ambiguous target");
 826                 exit(1);
 827         }
 828         targ = *argv;
 829         if (targetshouldbedirectory)
 830                 verifydir(targ);
 831
 832         (void) atomicio(vwrite, remout, "", 1);
 833         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 834                 targisdir = 1;
 835         for (first = 1;; first = 0) {
 836                 cp = buf;
 837                 if (atomicio(read, remin, cp, 1) != 1)
 838                         return;
 839                 if (*cp++ == '\n')
 840                         SCREWUP("unexpected <newline>");
 841                 do {
 842                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 843                                 SCREWUP("lost connection");
 844                         *cp++ = ch;
 845                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 846                 *cp = 0;
 847                 if (verbose_mode)
 848                         fprintf(stderr, "Sink: %s", buf);
 849
 850                 if (buf[0] == '\01' || buf[0] == '\02') {
 851                         if (iamremote == 0)
 852                                 (void) atomicio(vwrite, STDERR_FILENO,
 853                                     buf + 1, strlen(buf + 1));
 854                         if (buf[0] == '\02')
 855                                 exit(1);
 856                         ++errs;
 857                         continue;
 858                 }
 859                 if (buf[0] == 'E') {
 860                         (void) atomicio(vwrite, remout, "", 1);
 861                         return;
 862                 }
 863                 if (ch == '\n')
 864                         *--cp = 0;
 865
 866                 cp = buf;
 867                 if (*cp == 'T') {
 868                         setimes++;
 869                         cp++;
 870                         mtime.tv_sec = strtol(cp, &cp, 10);
 871                         if (!cp || *cp++ != ' ')
 872                                 SCREWUP("mtime.sec not delimited");
 873                         mtime.tv_usec = strtol(cp, &cp, 10);
 874                         if (!cp || *cp++ != ' ')
 875                                 SCREWUP("mtime.usec not delimited");
 876                         atime.tv_sec = strtol(cp, &cp, 10);
 877                         if (!cp || *cp++ != ' ')
 878                                 SCREWUP("atime.sec not delimited");
 879                         atime.tv_usec = strtol(cp, &cp, 10);
 880                         if (!cp || *cp++ != '\0')
 881                                 SCREWUP("atime.usec not delimited");
 882                         (void) atomicio(vwrite, remout, "", 1);
 883                         continue;
 884                 }
 885                 if (*cp != 'C' && *cp != 'D') {
 886                         /*
 887                          * Check for the case "rcp remote:foo\* local:bar".
 888                          * In this case, the line "No match." can be returned
 889                          * by the shell before the rcp command on the remote is
 890                          * executed so the ^Aerror_message convention isn't
 891                          * followed.
 892                          */
 893                         if (first) {
 894                                 run_err("%s", cp);
 895                                 exit(1);
 896                         }
 897                         SCREWUP("expected control record");
 898                 }
 899                 mode = 0;
 900                 for (++cp; cp < buf + 5; cp++) {
 901                         if (*cp < '0' || *cp > '7')
 902                                 SCREWUP("bad mode");
 903                         mode = (mode << 3) | (*cp - '0');
 904                 }
 905                 if (*cp++ != ' ')
 906                         SCREWUP("mode not delimited");
 907
 908                 for (size = 0; isdigit(*cp);)
 909                         size = size * 10 + (*cp++ - '0');
 910                 if (*cp++ != ' ')
 911                         SCREWUP("size not delimited");
 912                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 913                         run_err("error: unexpected filename: %s", cp);
 914                         exit(1);
 915                 }
 916                 if (targisdir) {
 917                         static char *namebuf;
 918                         static size_t cursize;
 919                         size_t need;
 920
 921                         need = strlen(targ) + strlen(cp) + 250;
 922                         if (need > cursize) {
 923                                 if (namebuf)
 924                                         xfree(namebuf);
 925                                 namebuf = xmalloc(need);
 926                                 cursize = need;
 927                         }
 928                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 929                             strcmp(targ, "/") ? "/" : "", cp);
 930                         np = namebuf;
 931                 } else
 932                         np = targ;
 933                 curfile = cp;
 934                 exists = stat(np, &stb) == 0;
 935                 if (buf[0] == 'D') {
 936                         int mod_flag = pflag;
 937                         if (!iamrecursive)
 938                                 SCREWUP("received directory without -r");
 939                         if (exists) {
 940                                 if (!S_ISDIR(stb.st_mode)) {
 941                                         errno = ENOTDIR;
 942                                         goto bad;
 943                                 }
 944                                 if (pflag)
 945                                         (void) chmod(np, mode);
 946                         } else {
 947                                 /* Handle copying from a read-only
 948                                    directory */
 949                                 mod_flag = 1;
 950                                 if (mkdir(np, mode | S_IRWXU) < 0)
 951                                         goto bad;
 952                         }
 953                         vect[0] = xstrdup(np);
 954                         sink(1, vect);
 955                         if (setimes) {
 956                                 setimes = 0;
 957                                 if (utimes(vect[0], tv) < 0)
 958                                         run_err("%s: set times: %s",
 959                                             vect[0], strerror(errno));
 960                         }
 961                         if (mod_flag)
 962                                 (void) chmod(vect[0], mode);
 963                         if (vect[0])
 964                                 xfree(vect[0]);
 965                         continue;
 966                 }
 967                 omode = mode;
 968                 mode |= S_IWRITE;
 969                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 970 bad:                    run_err("%s: %s", np, strerror(errno));
 971                         continue;
 972                 }
 973                 (void) atomicio(vwrite, remout, "", 1);
 974                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 975                         (void) close(ofd);
 976                         continue;
 977                 }
 978                 cp = bp->buf;
 979                 wrerr = NO;
 980
 981                 statbytes = 0;
 982                 if (showprogress)
 983                         start_progress_meter(curfile, size, &statbytes);
 984                 for (count = i = 0; i < size; i += 4096) {
 985                         amt = 4096;
 986                         if (i + amt > size)
 987                                 amt = size - i;
 988                         count += amt;
 989                         do {
 990                                 j = atomicio(read, remin, cp, amt);
 991                                 if (j == 0) {
 992                                         run_err("%s", j ? strerror(errno) :
 993                                             "dropped connection");
 994                                         exit(1);
 995                                 }
 996                                 amt -= j;
 997                                 cp += j;
 998                                 statbytes += j;
 999                         } while (amt > 0);
1000
1001                         if (limit_rate)
1002                                 bwlimit(4096);
1003
1004                         if (count == bp->cnt) {
1005                                 /* Keep reading so we stay sync'd up. */
1006                                 if (wrerr == NO) {
1007                                         if (atomicio(vwrite, ofd, bp->buf,
1008                                             count) != count) {
1009                                                 wrerr = YES;
1010                                                 wrerrno = errno;
1011                                         }
1012                                 }
1013                                 count = 0;
1014                                 cp = bp->buf;
1015                         }
1016                 }
1017                 if (showprogress)
1018                         stop_progress_meter();
1019                 if (count != 0 && wrerr == NO &&
1020                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1021                         wrerr = YES;
1022                         wrerrno = errno;
1023                 }
1024                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
1025                         run_err("%s: truncate: %s", np, strerror(errno));
1026                         wrerr = DISPLAYED;
1027                 }
1028                 if (pflag) {
1029                         if (exists || omode != mode)
1030 #ifdef HAVE_FCHMOD
1031                                 if (fchmod(ofd, omode)) {
1032 #else /* HAVE_FCHMOD */
1033                                 if (chmod(np, omode)) {
1034 #endif /* HAVE_FCHMOD */
1035                                         run_err("%s: set mode: %s",
1036                                             np, strerror(errno));
1037                                         wrerr = DISPLAYED;
1038                                 }
1039                 } else {
1040                         if (!exists && omode != mode)
1041 #ifdef HAVE_FCHMOD
1042                                 if (fchmod(ofd, omode & ~mask)) {
1043 #else /* HAVE_FCHMOD */
1044                                 if (chmod(np, omode & ~mask)) {
1045 #endif /* HAVE_FCHMOD */
1046                                         run_err("%s: set mode: %s",
1047                                             np, strerror(errno));
1048                                         wrerr = DISPLAYED;
1049                                 }
1050                 }
1051                 if (close(ofd) == -1) {
1052                         wrerr = YES;
1053                         wrerrno = errno;
1054                 }
1055                 (void) response();
1056                 if (setimes && wrerr == NO) {
1057                         setimes = 0;
1058                         if (utimes(np, tv) < 0) {
1059                                 run_err("%s: set times: %s",
1060                                     np, strerror(errno));
1061                                 wrerr = DISPLAYED;
1062                         }
1063                 }
1064                 switch (wrerr) {
1065                 case YES:
1066                         run_err("%s: %s", np, strerror(wrerrno));
1067                         break;
1068                 case NO:
1069                         (void) atomicio(vwrite, remout, "", 1);
1070                         break;
1071                 case DISPLAYED:
1072                         break;
1073                 }
1074         }
1075 screwup:
1076         run_err("protocol error: %s", why);
1077         exit(1);
1078 }
1079
1080 int
1081 response(void)
1082 {
1083         char ch, *cp, resp, rbuf[2048];
1084
1085         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1086                 lostconn(0);
1087
1088         cp = rbuf;
1089         switch (resp) {
1090         case 0:         /* ok */
1091                 return (0);
1092         default:
1093                 *cp++ = resp;
1094                 /* FALLTHROUGH */
1095         case 1:         /* error, followed by error msg */
1096         case 2:         /* fatal error, "" */
1097                 do {
1098                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1099                                 lostconn(0);
1100                         *cp++ = ch;
1101                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1102
1103                 if (!iamremote)
1104                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1105                 ++errs;
1106                 if (resp == 1)
1107                         return (-1);
1108                 exit(1);
1109         }
1110         /* NOTREACHED */
1111 }
1112
1113 void
1114 usage(void)
1115 {
1116         (void) fprintf(stderr,
1117             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1118             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1119             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1120         exit(1);
1121 }
1122
1123 void
1124 run_err(const char *fmt,...)
1125 {
1126         static FILE *fp;
1127         va_list ap;
1128
1129         ++errs;
1130         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1131                 (void) fprintf(fp, "%c", 0x01);
1132                 (void) fprintf(fp, "scp: ");
1133                 va_start(ap, fmt);
1134                 (void) vfprintf(fp, fmt, ap);
1135                 va_end(ap);
1136                 (void) fprintf(fp, "\n");
1137                 (void) fflush(fp);
1138         }
1139
1140         if (!iamremote) {
1141                 va_start(ap, fmt);
1142                 vfprintf(stderr, fmt, ap);
1143                 va_end(ap);
1144                 fprintf(stderr, "\n");
1145         }
1146 }
1147
1148 void
1149 verifydir(char *cp)
1150 {
1151         struct stat stb;
1152
1153         if (!stat(cp, &stb)) {
1154                 if (S_ISDIR(stb.st_mode))
1155                         return;
1156                 errno = ENOTDIR;
1157         }
1158         run_err("%s: %s", cp, strerror(errno));
1159         killchild(0);
1160 }
1161
1162 int
1163 okname(char *cp0)
1164 {
1165         int c;
1166         char *cp;
1167
1168         cp = cp0;
1169         do {
1170                 c = (int)*cp;
1171                 if (c & 0200)
1172                         goto bad;
1173                 if (!isalpha(c) && !isdigit(c)) {
1174                         switch (c) {
1175                         case '\'':
1176                         case '"':
1177                         case '`':
1178                         case ' ':
1179                         case '#':
1180                                 goto bad;
1181                         default:
1182                                 break;
1183                         }
1184                 }
1185         } while (*++cp);
1186         return (1);
1187
1188 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1189         return (0);
1190 }
1191
1192 BUF *
1193 allocbuf(BUF *bp, int fd, int blksize)
1194 {
1195         size_t size;
1196 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1197         struct stat stb;
1198
1199         if (fstat(fd, &stb) < 0) {
1200                 run_err("fstat: %s", strerror(errno));
1201                 return (0);
1202         }
1203         size = roundup(stb.st_blksize, blksize);
1204         if (size == 0)
1205                 size = blksize;
1206 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1207         size = blksize;
1208 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1209         if (bp->cnt >= size)
1210                 return (bp);
1211         if (bp->buf == NULL)
1212                 bp->buf = xmalloc(size);
1213         else
1214                 bp->buf = xrealloc(bp->buf, 1, size);
1215         memset(bp->buf, 0, size);
1216         bp->cnt = size;
1217         return (bp);
1218 }
1219
1220 void
1221 lostconn(int signo)
1222 {
1223         if (!iamremote)
1224                 write(STDERR_FILENO, "lost connection\n", 16);
1225         if (signo)
1226                 _exit(1);
1227         else
1228                 exit(1);
1229 }