crypto/openssh-4/scp.c

   1 /* $OpenBSD: scp.c,v 1.160 2007/08/06 19:16:06 sobrado 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 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H)
 100 #include <vis.h>
 101 #endif
 102
 103 #include "xmalloc.h"
 104 #include "atomicio.h"
 105 #include "pathnames.h"
 106 #include "log.h"
 107 #include "misc.h"
 108 #include "progressmeter.h"
 109
 110 extern char *__progname;
 111
 112 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 113
 114 void bwlimit(int);
 115
 116 /* Struct for addargs */
 117 arglist args;
 118
 119 /* Bandwidth limit */
 120 off_t limit_rate = 0;
 121
 122 /* Name of current file being transferred. */
 123 char *curfile;
 124
 125 /* This is set to non-zero to enable verbose mode. */
 126 int verbose_mode = 0;
 127
 128 /* This is set to zero if the progressmeter is not desired. */
 129 int showprogress = 1;
 130
 131 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 132 char *ssh_program = _PATH_SSH_PROGRAM;
 133
 134 /* This is used to store the pid of ssh_program */
 135 pid_t do_cmd_pid = -1;
 136
 137 static void
 138 killchild(int signo)
 139 {
 140         if (do_cmd_pid > 1) {
 141                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 142                 waitpid(do_cmd_pid, NULL, 0);
 143         }
 144
 145         if (signo)
 146                 _exit(1);
 147         exit(1);
 148 }
 149
 150 static int
 151 do_local_cmd(arglist *a)
 152 {
 153         u_int i;
 154         int status;
 155         pid_t pid;
 156
 157         if (a->num == 0)
 158                 fatal("do_local_cmd: no arguments");
 159
 160         if (verbose_mode) {
 161                 fprintf(stderr, "Executing:");
 162                 for (i = 0; i < a->num; i++)
 163                         fprintf(stderr, " %s", a->list[i]);
 164                 fprintf(stderr, "\n");
 165         }
 166         if ((pid = fork()) == -1)
 167                 fatal("do_local_cmd: fork: %s", strerror(errno));
 168
 169         if (pid == 0) {
 170                 execvp(a->list[0], a->list);
 171                 perror(a->list[0]);
 172                 exit(1);
 173         }
 174
 175         do_cmd_pid = pid;
 176         signal(SIGTERM, killchild);
 177         signal(SIGINT, killchild);
 178         signal(SIGHUP, killchild);
 179
 180         while (waitpid(pid, &status, 0) == -1)
 181                 if (errno != EINTR)
 182                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 183
 184         do_cmd_pid = -1;
 185
 186         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 187                 return (-1);
 188
 189         return (0);
 190 }
 191
 192 /*
 193  * This function executes the given command as the specified user on the
 194  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 195  * assigns the input and output file descriptors on success.
 196  */
 197
 198 int
 199 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 200 {
 201         int pin[2], pout[2], reserved[2];
 202
 203         if (verbose_mode)
 204                 fprintf(stderr,
 205                     "Executing: program %s host %s, user %s, command %s\n",
 206                     ssh_program, host,
 207                     remuser ? remuser : "(unspecified)", cmd);
 208
 209         /*
 210          * Reserve two descriptors so that the real pipes won't get
 211          * descriptors 0 and 1 because that will screw up dup2 below.
 212          */
 213         if (pipe(reserved) < 0)
 214                 fatal("pipe: %s", strerror(errno));
 215
 216         /* Create a socket pair for communicating with ssh. */
 217         if (pipe(pin) < 0)
 218                 fatal("pipe: %s", strerror(errno));
 219         if (pipe(pout) < 0)
 220                 fatal("pipe: %s", strerror(errno));
 221
 222         /* Free the reserved descriptors. */
 223         close(reserved[0]);
 224         close(reserved[1]);
 225
 226         /* Fork a child to execute the command on the remote host using ssh. */
 227         do_cmd_pid = fork();
 228         if (do_cmd_pid == 0) {
 229                 /* Child. */
 230                 close(pin[1]);
 231                 close(pout[0]);
 232                 dup2(pin[0], 0);
 233                 dup2(pout[1], 1);
 234                 close(pin[0]);
 235                 close(pout[1]);
 236
 237                 replacearg(&args, 0, "%s", ssh_program);
 238                 if (remuser != NULL)
 239                         addargs(&args, "-l%s", remuser);
 240                 addargs(&args, "%s", host);
 241                 addargs(&args, "%s", cmd);
 242
 243                 execvp(ssh_program, args.list);
 244                 perror(ssh_program);
 245                 exit(1);
 246         } else if (do_cmd_pid == -1) {
 247                 fatal("fork: %s", strerror(errno));
 248         }
 249         /* Parent.  Close the other side, and return the local side. */
 250         close(pin[0]);
 251         *fdout = pin[1];
 252         close(pout[1]);
 253         *fdin = pout[0];
 254         signal(SIGTERM, killchild);
 255         signal(SIGINT, killchild);
 256         signal(SIGHUP, killchild);
 257         return 0;
 258 }
 259
 260 typedef struct {
 261         size_t cnt;
 262         char *buf;
 263 } BUF;
 264
 265 BUF *allocbuf(BUF *, int, int);
 266 void lostconn(int);
 267 int okname(char *);
 268 void run_err(const char *,...);
 269 void verifydir(char *);
 270
 271 struct passwd *pwd;
 272 uid_t userid;
 273 int errs, remin, remout;
 274 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 275
 276 #define CMDNEEDS        64
 277 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 278
 279 int response(void);
 280 void rsource(char *, struct stat *);
 281 void sink(int, char *[]);
 282 void source(int, char *[]);
 283 void tolocal(int, char *[]);
 284 void toremote(char *, int, char *[]);
 285 void usage(void);
 286
 287 int
 288 main(int argc, char **argv)
 289 {
 290         int ch, fflag, tflag, status, n;
 291         double speed;
 292         char *targ, *endp, **newargv;
 293         extern char *optarg;
 294         extern int optind;
 295
 296         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 297         sanitise_stdfd();
 298
 299         /* Copy argv, because we modify it */
 300         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 301         for (n = 0; n < argc; n++)
 302                 newargv[n] = xstrdup(argv[n]);
 303         argv = newargv;
 304
 305         __progname = ssh_get_progname(argv[0]);
 306
 307         memset(&args, '\0', sizeof(args));
 308         args.list = NULL;
 309         addargs(&args, "%s", ssh_program);
 310         addargs(&args, "-x");
 311         addargs(&args, "-oForwardAgent no");
 312         addargs(&args, "-oPermitLocalCommand no");
 313         addargs(&args, "-oClearAllForwardings yes");
 314
 315         fflag = tflag = 0;
 316         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 317                 switch (ch) {
 318                 /* User-visible flags. */
 319                 case '1':
 320                 case '2':
 321                 case '4':
 322                 case '6':
 323                 case 'C':
 324                         addargs(&args, "-%c", ch);
 325                         break;
 326                 case 'o':
 327                 case 'c':
 328                 case 'i':
 329                 case 'F':
 330                         addargs(&args, "-%c%s", ch, optarg);
 331                         break;
 332                 case 'P':
 333                         addargs(&args, "-p%s", optarg);
 334                         break;
 335                 case 'B':
 336                         addargs(&args, "-oBatchmode yes");
 337                         break;
 338                 case 'l':
 339                         speed = strtod(optarg, &endp);
 340                         if (speed <= 0 || *endp != '\0')
 341                                 usage();
 342                         limit_rate = speed * 1024;
 343                         break;
 344                 case 'p':
 345                         pflag = 1;
 346                         break;
 347                 case 'r':
 348                         iamrecursive = 1;
 349                         break;
 350                 case 'S':
 351                         ssh_program = xstrdup(optarg);
 352                         break;
 353                 case 'v':
 354                         addargs(&args, "-v");
 355                         verbose_mode = 1;
 356                         break;
 357                 case 'q':
 358                         addargs(&args, "-q");
 359                         showprogress = 0;
 360                         break;
 361
 362                 /* Server options. */
 363                 case 'd':
 364                         targetshouldbedirectory = 1;
 365                         break;
 366                 case 'f':       /* "from" */
 367                         iamremote = 1;
 368                         fflag = 1;
 369                         break;
 370                 case 't':       /* "to" */
 371                         iamremote = 1;
 372                         tflag = 1;
 373 #ifdef HAVE_CYGWIN
 374                         setmode(0, O_BINARY);
 375 #endif
 376                         break;
 377                 default:
 378                         usage();
 379                 }
 380         argc -= optind;
 381         argv += optind;
 382
 383         if ((pwd = getpwuid(userid = getuid())) == NULL)
 384                 fatal("unknown user %u", (u_int) userid);
 385
 386         if (!isatty(STDOUT_FILENO))
 387                 showprogress = 0;
 388
 389         remin = STDIN_FILENO;
 390         remout = STDOUT_FILENO;
 391
 392         if (fflag) {
 393                 /* Follow "protocol", send data. */
 394                 (void) response();
 395                 source(argc, argv);
 396                 exit(errs != 0);
 397         }
 398         if (tflag) {
 399                 /* Receive data. */
 400                 sink(argc, argv);
 401                 exit(errs != 0);
 402         }
 403         if (argc < 2)
 404                 usage();
 405         if (argc > 2)
 406                 targetshouldbedirectory = 1;
 407
 408         remin = remout = -1;
 409         do_cmd_pid = -1;
 410         /* Command to be executed on remote system using "ssh". */
 411         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 412             verbose_mode ? " -v" : "",
 413             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 414             targetshouldbedirectory ? " -d" : "");
 415
 416         (void) signal(SIGPIPE, lostconn);
 417
 418         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 419                 toremote(targ, argc, argv);
 420         else {
 421                 if (targetshouldbedirectory)
 422                         verifydir(argv[argc - 1]);
 423                 tolocal(argc, argv);    /* Dest is local host. */
 424         }
 425         /*
 426          * Finally check the exit status of the ssh process, if one was forked
 427          * and no error has occured yet
 428          */
 429         if (do_cmd_pid != -1 && errs == 0) {
 430                 if (remin != -1)
 431                     (void) close(remin);
 432                 if (remout != -1)
 433                     (void) close(remout);
 434                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 435                         errs = 1;
 436                 else {
 437                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 438                                 errs = 1;
 439                 }
 440         }
 441         exit(errs != 0);
 442 }
 443
 444 void
 445 toremote(char *targ, int argc, char **argv)
 446 {
 447         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 448         arglist alist;
 449         int i;
 450
 451         memset(&alist, '\0', sizeof(alist));
 452         alist.list = NULL;
 453
 454         *targ++ = 0;
 455         if (*targ == 0)
 456                 targ = ".";
 457
 458         arg = xstrdup(argv[argc - 1]);
 459         if ((thost = strrchr(arg, '@'))) {
 460                 /* user@host */
 461                 *thost++ = 0;
 462                 tuser = arg;
 463                 if (*tuser == '\0')
 464                         tuser = NULL;
 465         } else {
 466                 thost = arg;
 467                 tuser = NULL;
 468         }
 469
 470         if (tuser != NULL && !okname(tuser)) {
 471                 xfree(arg);
 472                 return;
 473         }
 474
 475         for (i = 0; i < argc - 1; i++) {
 476                 src = colon(argv[i]);
 477                 if (src) {      /* remote to remote */
 478                         freeargs(&alist);
 479                         addargs(&alist, "%s", ssh_program);
 480                         if (verbose_mode)
 481                                 addargs(&alist, "-v");
 482                         addargs(&alist, "-x");
 483                         addargs(&alist, "-oClearAllForwardings yes");
 484                         addargs(&alist, "-n");
 485
 486                         *src++ = 0;
 487                         if (*src == 0)
 488                                 src = ".";
 489                         host = strrchr(argv[i], '@');
 490
 491                         if (host) {
 492                                 *host++ = 0;
 493                                 host = cleanhostname(host);
 494                                 suser = argv[i];
 495                                 if (*suser == '\0')
 496                                         suser = pwd->pw_name;
 497                                 else if (!okname(suser))
 498                                         continue;
 499                                 addargs(&alist, "-l");
 500                                 addargs(&alist, "%s", suser);
 501                         } else {
 502                                 host = cleanhostname(argv[i]);
 503                         }
 504                         addargs(&alist, "%s", host);
 505                         addargs(&alist, "%s", cmd);
 506                         addargs(&alist, "%s", src);
 507                         addargs(&alist, "%s%s%s:%s",
 508                             tuser ? tuser : "", tuser ? "@" : "",
 509                             thost, targ);
 510                         if (do_local_cmd(&alist) != 0)
 511                                 errs = 1;
 512                 } else {        /* local to remote */
 513                         if (remin == -1) {
 514                                 xasprintf(&bp, "%s -t %s", cmd, targ);
 515                                 host = cleanhostname(thost);
 516                                 if (do_cmd(host, tuser, bp, &remin,
 517                                     &remout) < 0)
 518                                         exit(1);
 519                                 if (response() < 0)
 520                                         exit(1);
 521                                 (void) xfree(bp);
 522                         }
 523                         source(1, argv + i);
 524                 }
 525         }
 526         xfree(arg);
 527 }
 528
 529 void
 530 tolocal(int argc, char **argv)
 531 {
 532         char *bp, *host, *src, *suser;
 533         arglist alist;
 534         int i;
 535
 536         memset(&alist, '\0', sizeof(alist));
 537         alist.list = NULL;
 538
 539         for (i = 0; i < argc - 1; i++) {
 540                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 541                         freeargs(&alist);
 542                         addargs(&alist, "%s", _PATH_CP);
 543                         if (iamrecursive)
 544                                 addargs(&alist, "-r");
 545                         if (pflag)
 546                                 addargs(&alist, "-p");
 547                         addargs(&alist, "%s", argv[i]);
 548                         addargs(&alist, "%s", argv[argc-1]);
 549                         if (do_local_cmd(&alist))
 550                                 ++errs;
 551                         continue;
 552                 }
 553                 *src++ = 0;
 554                 if (*src == 0)
 555                         src = ".";
 556                 if ((host = strrchr(argv[i], '@')) == NULL) {
 557                         host = argv[i];
 558                         suser = NULL;
 559                 } else {
 560                         *host++ = 0;
 561                         suser = argv[i];
 562                         if (*suser == '\0')
 563                                 suser = pwd->pw_name;
 564                 }
 565                 host = cleanhostname(host);
 566                 xasprintf(&bp, "%s -f %s", cmd, src);
 567                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 568                         (void) xfree(bp);
 569                         ++errs;
 570                         continue;
 571                 }
 572                 xfree(bp);
 573                 sink(1, argv + argc - 1);
 574                 (void) close(remin);
 575                 remin = remout = -1;
 576         }
 577 }
 578
 579 void
 580 source(int argc, char **argv)
 581 {
 582         struct stat stb;
 583         static BUF buffer;
 584         BUF *bp;
 585         off_t i, amt, statbytes;
 586         size_t result;
 587         int fd = -1, haderr, indx;
 588         char *last, *name, buf[2048], encname[MAXPATHLEN];
 589         int len;
 590
 591         for (indx = 0; indx < argc; ++indx) {
 592                 name = argv[indx];
 593                 statbytes = 0;
 594                 len = strlen(name);
 595                 while (len > 1 && name[len-1] == '/')
 596                         name[--len] = '\0';
 597                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 598                         goto syserr;
 599                 if (strchr(name, '\n') != NULL) {
 600                         strnvis(encname, name, sizeof(encname), VIS_NL);
 601                         name = encname;
 602                 }
 603                 if (fstat(fd, &stb) < 0) {
 604 syserr:                 run_err("%s: %s", name, strerror(errno));
 605                         goto next;
 606                 }
 607                 unset_nonblock(fd);
 608                 switch (stb.st_mode & S_IFMT) {
 609                 case S_IFREG:
 610                         break;
 611                 case S_IFDIR:
 612                         if (iamrecursive) {
 613                                 rsource(name, &stb);
 614                                 goto next;
 615                         }
 616                         /* FALLTHROUGH */
 617                 default:
 618                         run_err("%s: not a regular file", name);
 619                         goto next;
 620                 }
 621                 if ((last = strrchr(name, '/')) == NULL)
 622                         last = name;
 623                 else
 624                         ++last;
 625                 curfile = last;
 626                 if (pflag) {
 627                         /*
 628                          * Make it compatible with possible future
 629                          * versions expecting microseconds.
 630                          */
 631                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 632                             (u_long) stb.st_mtime,
 633                             (u_long) stb.st_atime);
 634                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 635                         if (response() < 0)
 636                                 goto next;
 637                 }
 638 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 639                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 640                     (u_int) (stb.st_mode & FILEMODEMASK),
 641                     (long long)stb.st_size, last);
 642                 if (verbose_mode) {
 643                         fprintf(stderr, "Sending file modes: %s", buf);
 644                 }
 645                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 646                 if (response() < 0)
 647                         goto next;
 648                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 649 next:                   if (fd != -1) {
 650                                 (void) close(fd);
 651                                 fd = -1;
 652                         }
 653                         continue;
 654                 }
 655                 if (showprogress)
 656                         start_progress_meter(curfile, stb.st_size, &statbytes);
 657                 /* Keep writing after an error so that we stay sync'd up. */
 658                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 659                         amt = bp->cnt;
 660                         if (i + amt > stb.st_size)
 661                                 amt = stb.st_size - i;
 662                         if (!haderr) {
 663                                 result = atomicio(read, fd, bp->buf, amt);
 664                                 if (result != amt)
 665                                         haderr = errno;
 666                         }
 667                         if (haderr)
 668                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 669                         else {
 670                                 result = atomicio(vwrite, remout, bp->buf, amt);
 671                                 if (result != amt)
 672                                         haderr = errno;
 673                                 statbytes += result;
 674                         }
 675                         if (limit_rate)
 676                                 bwlimit(amt);
 677                 }
 678                 if (showprogress)
 679                         stop_progress_meter();
 680
 681                 if (fd != -1) {
 682                         if (close(fd) < 0 && !haderr)
 683                                 haderr = errno;
 684                         fd = -1;
 685                 }
 686                 if (!haderr)
 687                         (void) atomicio(vwrite, remout, "", 1);
 688                 else
 689                         run_err("%s: %s", name, strerror(haderr));
 690                 (void) response();
 691         }
 692 }
 693
 694 void
 695 rsource(char *name, struct stat *statp)
 696 {
 697         DIR *dirp;
 698         struct dirent *dp;
 699         char *last, *vect[1], path[1100];
 700
 701         if (!(dirp = opendir(name))) {
 702                 run_err("%s: %s", name, strerror(errno));
 703                 return;
 704         }
 705         last = strrchr(name, '/');
 706         if (last == 0)
 707                 last = name;
 708         else
 709                 last++;
 710         if (pflag) {
 711                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 712                     (u_long) statp->st_mtime,
 713                     (u_long) statp->st_atime);
 714                 (void) atomicio(vwrite, remout, path, strlen(path));
 715                 if (response() < 0) {
 716                         closedir(dirp);
 717                         return;
 718                 }
 719         }
 720         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 721             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 722         if (verbose_mode)
 723                 fprintf(stderr, "Entering directory: %s", path);
 724         (void) atomicio(vwrite, remout, path, strlen(path));
 725         if (response() < 0) {
 726                 closedir(dirp);
 727                 return;
 728         }
 729         while ((dp = readdir(dirp)) != NULL) {
 730                 if (dp->d_ino == 0)
 731                         continue;
 732                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 733                         continue;
 734                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 735                         run_err("%s/%s: name too long", name, dp->d_name);
 736                         continue;
 737                 }
 738                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 739                 vect[0] = path;
 740                 source(1, vect);
 741         }
 742         (void) closedir(dirp);
 743         (void) atomicio(vwrite, remout, "E\n", 2);
 744         (void) response();
 745 }
 746
 747 void
 748 bwlimit(int amount)
 749 {
 750         static struct timeval bwstart, bwend;
 751         static int lamt, thresh = 16384;
 752         u_int64_t waitlen;
 753         struct timespec ts, rm;
 754
 755         if (!timerisset(&bwstart)) {
 756                 gettimeofday(&bwstart, NULL);
 757                 return;
 758         }
 759
 760         lamt += amount;
 761         if (lamt < thresh)
 762                 return;
 763
 764         gettimeofday(&bwend, NULL);
 765         timersub(&bwend, &bwstart, &bwend);
 766         if (!timerisset(&bwend))
 767                 return;
 768
 769         lamt *= 8;
 770         waitlen = (double)1000000L * lamt / limit_rate;
 771
 772         bwstart.tv_sec = waitlen / 1000000L;
 773         bwstart.tv_usec = waitlen % 1000000L;
 774
 775         if (timercmp(&bwstart, &bwend, >)) {
 776                 timersub(&bwstart, &bwend, &bwend);
 777
 778                 /* Adjust the wait time */
 779                 if (bwend.tv_sec) {
 780                         thresh /= 2;
 781                         if (thresh < 2048)
 782                                 thresh = 2048;
 783                 } else if (bwend.tv_usec < 100) {
 784                         thresh *= 2;
 785                         if (thresh > 32768)
 786                                 thresh = 32768;
 787                 }
 788
 789                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 790                 while (nanosleep(&ts, &rm) == -1) {
 791                         if (errno != EINTR)
 792                                 break;
 793                         ts = rm;
 794                 }
 795         }
 796
 797         lamt = 0;
 798         gettimeofday(&bwstart, NULL);
 799 }
 800
 801 void
 802 sink(int argc, char **argv)
 803 {
 804         static BUF buffer;
 805         struct stat stb;
 806         enum {
 807                 YES, NO, DISPLAYED
 808         } wrerr;
 809         BUF *bp;
 810         off_t i;
 811         size_t j, count;
 812         int amt, exists, first, ofd;
 813         mode_t mode, omode, mask;
 814         off_t size, statbytes;
 815         int setimes, targisdir, wrerrno = 0;
 816         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 817         struct timeval tv[2];
 818
 819 #define atime   tv[0]
 820 #define mtime   tv[1]
 821 #define SCREWUP(str)    { why = str; goto screwup; }
 822
 823         setimes = targisdir = 0;
 824         mask = umask(0);
 825         if (!pflag)
 826                 (void) umask(mask);
 827         if (argc != 1) {
 828                 run_err("ambiguous target");
 829                 exit(1);
 830         }
 831         targ = *argv;
 832         if (targetshouldbedirectory)
 833                 verifydir(targ);
 834
 835         (void) atomicio(vwrite, remout, "", 1);
 836         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 837                 targisdir = 1;
 838         for (first = 1;; first = 0) {
 839                 cp = buf;
 840                 if (atomicio(read, remin, cp, 1) != 1)
 841                         return;
 842                 if (*cp++ == '\n')
 843                         SCREWUP("unexpected <newline>");
 844                 do {
 845                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 846                                 SCREWUP("lost connection");
 847                         *cp++ = ch;
 848                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 849                 *cp = 0;
 850                 if (verbose_mode)
 851                         fprintf(stderr, "Sink: %s", buf);
 852
 853                 if (buf[0] == '\01' || buf[0] == '\02') {
 854                         if (iamremote == 0)
 855                                 (void) atomicio(vwrite, STDERR_FILENO,
 856                                     buf + 1, strlen(buf + 1));
 857                         if (buf[0] == '\02')
 858                                 exit(1);
 859                         ++errs;
 860                         continue;
 861                 }
 862                 if (buf[0] == 'E') {
 863                         (void) atomicio(vwrite, remout, "", 1);
 864                         return;
 865                 }
 866                 if (ch == '\n')
 867                         *--cp = 0;
 868
 869                 cp = buf;
 870                 if (*cp == 'T') {
 871                         setimes++;
 872                         cp++;
 873                         mtime.tv_sec = strtol(cp, &cp, 10);
 874                         if (!cp || *cp++ != ' ')
 875                                 SCREWUP("mtime.sec not delimited");
 876                         mtime.tv_usec = strtol(cp, &cp, 10);
 877                         if (!cp || *cp++ != ' ')
 878                                 SCREWUP("mtime.usec not delimited");
 879                         atime.tv_sec = strtol(cp, &cp, 10);
 880                         if (!cp || *cp++ != ' ')
 881                                 SCREWUP("atime.sec not delimited");
 882                         atime.tv_usec = strtol(cp, &cp, 10);
 883                         if (!cp || *cp++ != '\0')
 884                                 SCREWUP("atime.usec not delimited");
 885                         (void) atomicio(vwrite, remout, "", 1);
 886                         continue;
 887                 }
 888                 if (*cp != 'C' && *cp != 'D') {
 889                         /*
 890                          * Check for the case "rcp remote:foo\* local:bar".
 891                          * In this case, the line "No match." can be returned
 892                          * by the shell before the rcp command on the remote is
 893                          * executed so the ^Aerror_message convention isn't
 894                          * followed.
 895                          */
 896                         if (first) {
 897                                 run_err("%s", cp);
 898                                 exit(1);
 899                         }
 900                         SCREWUP("expected control record");
 901                 }
 902                 mode = 0;
 903                 for (++cp; cp < buf + 5; cp++) {
 904                         if (*cp < '0' || *cp > '7')
 905                                 SCREWUP("bad mode");
 906                         mode = (mode << 3) | (*cp - '0');
 907                 }
 908                 if (*cp++ != ' ')
 909                         SCREWUP("mode not delimited");
 910
 911                 for (size = 0; isdigit(*cp);)
 912                         size = size * 10 + (*cp++ - '0');
 913                 if (*cp++ != ' ')
 914                         SCREWUP("size not delimited");
 915                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 916                         run_err("error: unexpected filename: %s", cp);
 917                         exit(1);
 918                 }
 919                 if (targisdir) {
 920                         static char *namebuf;
 921                         static size_t cursize;
 922                         size_t need;
 923
 924                         need = strlen(targ) + strlen(cp) + 250;
 925                         if (need > cursize) {
 926                                 if (namebuf)
 927                                         xfree(namebuf);
 928                                 namebuf = xmalloc(need);
 929                                 cursize = need;
 930                         }
 931                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 932                             strcmp(targ, "/") ? "/" : "", cp);
 933                         np = namebuf;
 934                 } else
 935                         np = targ;
 936                 curfile = cp;
 937                 exists = stat(np, &stb) == 0;
 938                 if (buf[0] == 'D') {
 939                         int mod_flag = pflag;
 940                         if (!iamrecursive)
 941                                 SCREWUP("received directory without -r");
 942                         if (exists) {
 943                                 if (!S_ISDIR(stb.st_mode)) {
 944                                         errno = ENOTDIR;
 945                                         goto bad;
 946                                 }
 947                                 if (pflag)
 948                                         (void) chmod(np, mode);
 949                         } else {
 950                                 /* Handle copying from a read-only
 951                                    directory */
 952                                 mod_flag = 1;
 953                                 if (mkdir(np, mode | S_IRWXU) < 0)
 954                                         goto bad;
 955                         }
 956                         vect[0] = xstrdup(np);
 957                         sink(1, vect);
 958                         if (setimes) {
 959                                 setimes = 0;
 960                                 if (utimes(vect[0], tv) < 0)
 961                                         run_err("%s: set times: %s",
 962                                             vect[0], strerror(errno));
 963                         }
 964                         if (mod_flag)
 965                                 (void) chmod(vect[0], mode);
 966                         if (vect[0])
 967                                 xfree(vect[0]);
 968                         continue;
 969                 }
 970                 omode = mode;
 971                 mode |= S_IWRITE;
 972                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 973 bad:                    run_err("%s: %s", np, strerror(errno));
 974                         continue;
 975                 }
 976                 (void) atomicio(vwrite, remout, "", 1);
 977                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 978                         (void) close(ofd);
 979                         continue;
 980                 }
 981                 cp = bp->buf;
 982                 wrerr = NO;
 983
 984                 statbytes = 0;
 985                 if (showprogress)
 986                         start_progress_meter(curfile, size, &statbytes);
 987                 for (count = i = 0; i < size; i += 4096) {
 988                         amt = 4096;
 989                         if (i + amt > size)
 990                                 amt = size - i;
 991                         count += amt;
 992                         do {
 993                                 j = atomicio(read, remin, cp, amt);
 994                                 if (j == 0) {
 995                                         run_err("%s", j ? strerror(errno) :
 996                                             "dropped connection");
 997                                         exit(1);
 998                                 }
 999                                 amt -= j;
1000                                 cp += j;
1001                                 statbytes += j;
1002                         } while (amt > 0);
1003
1004                         if (limit_rate)
1005                                 bwlimit(4096);
1006
1007                         if (count == bp->cnt) {
1008                                 /* Keep reading so we stay sync'd up. */
1009                                 if (wrerr == NO) {
1010                                         if (atomicio(vwrite, ofd, bp->buf,
1011                                             count) != count) {
1012                                                 wrerr = YES;
1013                                                 wrerrno = errno;
1014                                         }
1015                                 }
1016                                 count = 0;
1017                                 cp = bp->buf;
1018                         }
1019                 }
1020                 if (showprogress)
1021                         stop_progress_meter();
1022                 if (count != 0 && wrerr == NO &&
1023                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1024                         wrerr = YES;
1025                         wrerrno = errno;
1026                 }
1027                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1028                     ftruncate(ofd, size) != 0) {
1029                         run_err("%s: truncate: %s", np, strerror(errno));
1030                         wrerr = DISPLAYED;
1031                 }
1032                 if (pflag) {
1033                         if (exists || omode != mode)
1034 #ifdef HAVE_FCHMOD
1035                                 if (fchmod(ofd, omode)) {
1036 #else /* HAVE_FCHMOD */
1037                                 if (chmod(np, omode)) {
1038 #endif /* HAVE_FCHMOD */
1039                                         run_err("%s: set mode: %s",
1040                                             np, strerror(errno));
1041                                         wrerr = DISPLAYED;
1042                                 }
1043                 } else {
1044                         if (!exists && omode != mode)
1045 #ifdef HAVE_FCHMOD
1046                                 if (fchmod(ofd, omode & ~mask)) {
1047 #else /* HAVE_FCHMOD */
1048                                 if (chmod(np, omode & ~mask)) {
1049 #endif /* HAVE_FCHMOD */
1050                                         run_err("%s: set mode: %s",
1051                                             np, strerror(errno));
1052                                         wrerr = DISPLAYED;
1053                                 }
1054                 }
1055                 if (close(ofd) == -1) {
1056                         wrerr = YES;
1057                         wrerrno = errno;
1058                 }
1059                 (void) response();
1060                 if (setimes && wrerr == NO) {
1061                         setimes = 0;
1062                         if (utimes(np, tv) < 0) {
1063                                 run_err("%s: set times: %s",
1064                                     np, strerror(errno));
1065                                 wrerr = DISPLAYED;
1066                         }
1067                 }
1068                 switch (wrerr) {
1069                 case YES:
1070                         run_err("%s: %s", np, strerror(wrerrno));
1071                         break;
1072                 case NO:
1073                         (void) atomicio(vwrite, remout, "", 1);
1074                         break;
1075                 case DISPLAYED:
1076                         break;
1077                 }
1078         }
1079 screwup:
1080         run_err("protocol error: %s", why);
1081         exit(1);
1082 }
1083
1084 int
1085 response(void)
1086 {
1087         char ch, *cp, resp, rbuf[2048];
1088
1089         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1090                 lostconn(0);
1091
1092         cp = rbuf;
1093         switch (resp) {
1094         case 0:         /* ok */
1095                 return (0);
1096         default:
1097                 *cp++ = resp;
1098                 /* FALLTHROUGH */
1099         case 1:         /* error, followed by error msg */
1100         case 2:         /* fatal error, "" */
1101                 do {
1102                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1103                                 lostconn(0);
1104                         *cp++ = ch;
1105                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1106
1107                 if (!iamremote)
1108                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1109                 ++errs;
1110                 if (resp == 1)
1111                         return (-1);
1112                 exit(1);
1113         }
1114         /* NOTREACHED */
1115 }
1116
1117 void
1118 usage(void)
1119 {
1120         (void) fprintf(stderr,
1121             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1122             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1123             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1124         exit(1);
1125 }
1126
1127 void
1128 run_err(const char *fmt,...)
1129 {
1130         static FILE *fp;
1131         va_list ap;
1132
1133         ++errs;
1134         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1135                 (void) fprintf(fp, "%c", 0x01);
1136                 (void) fprintf(fp, "scp: ");
1137                 va_start(ap, fmt);
1138                 (void) vfprintf(fp, fmt, ap);
1139                 va_end(ap);
1140                 (void) fprintf(fp, "\n");
1141                 (void) fflush(fp);
1142         }
1143
1144         if (!iamremote) {
1145                 va_start(ap, fmt);
1146                 vfprintf(stderr, fmt, ap);
1147                 va_end(ap);
1148                 fprintf(stderr, "\n");
1149         }
1150 }
1151
1152 void
1153 verifydir(char *cp)
1154 {
1155         struct stat stb;
1156
1157         if (!stat(cp, &stb)) {
1158                 if (S_ISDIR(stb.st_mode))
1159                         return;
1160                 errno = ENOTDIR;
1161         }
1162         run_err("%s: %s", cp, strerror(errno));
1163         killchild(0);
1164 }
1165
1166 int
1167 okname(char *cp0)
1168 {
1169         int c;
1170         char *cp;
1171
1172         cp = cp0;
1173         do {
1174                 c = (int)*cp;
1175                 if (c & 0200)
1176                         goto bad;
1177                 if (!isalpha(c) && !isdigit(c)) {
1178                         switch (c) {
1179                         case '\'':
1180                         case '"':
1181                         case '`':
1182                         case ' ':
1183                         case '#':
1184                                 goto bad;
1185                         default:
1186                                 break;
1187                         }
1188                 }
1189         } while (*++cp);
1190         return (1);
1191
1192 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1193         return (0);
1194 }
1195
1196 BUF *
1197 allocbuf(BUF *bp, int fd, int blksize)
1198 {
1199         size_t size;
1200 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1201         struct stat stb;
1202
1203         if (fstat(fd, &stb) < 0) {
1204                 run_err("fstat: %s", strerror(errno));
1205                 return (0);
1206         }
1207         size = roundup(stb.st_blksize, blksize);
1208         if (size == 0)
1209                 size = blksize;
1210 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1211         size = blksize;
1212 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1213         if (bp->cnt >= size)
1214                 return (bp);
1215         if (bp->buf == NULL)
1216                 bp->buf = xmalloc(size);
1217         else
1218                 bp->buf = xrealloc(bp->buf, 1, size);
1219         memset(bp->buf, 0, size);
1220         bp->cnt = size;
1221         return (bp);
1222 }
1223
1224 void
1225 lostconn(int signo)
1226 {
1227         if (!iamremote)
1228                 write(STDERR_FILENO, "lost connection\n", 16);
1229         if (signo)
1230                 _exit(1);
1231         else
1232                 exit(1);
1233 }