scp.c

   1 /* $OpenBSD: scp.c,v 1.148 2006/07/17 01:31:09 stevesk Exp $ */
   2 /*
   3  * scp - secure remote copy.  This is basically patched BSD rcp which
   4  * uses ssh to do the data transfer (instead of using rcmd).
   5  *
   6  * NOTE: This version should NOT be suid root.  (This uses ssh to
   7  * do the transfer and ssh has the necessary privileges.)
   8  *
   9  * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
  10  *
  11  * As far as I am concerned, the code I have written for this software
  12  * can be used freely for any purpose.  Any derived versions of this
  13  * software must be clearly marked as such, and if the derived work is
  14  * incompatible with the protocol description in the RFC file, it must be
  15  * called by a name other than "ssh" or "Secure Shell".
  16  */
  17 /*
  18  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  19  * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  * 1. Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in the
  28  *    documentation and/or other materials provided with the distribution.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  33  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  39  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 /*
  43  * Parts from:
  44  *
  45  * Copyright (c) 1983, 1990, 1992, 1993, 1995
  46  *      The Regents of the University of California.  All rights reserved.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice, this list of conditions and the following disclaimer.
  53  * 2. Redistributions in binary form must reproduce the above copyright
  54  *    notice, this list of conditions and the following disclaimer in the
  55  *    documentation and/or other materials provided with the distribution.
  56  * 3. Neither the name of the University nor the names of its contributors
  57  *    may be used to endorse or promote products derived from this software
  58  *    without specific prior written permission.
  59  *
  60  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  61  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  63  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  64  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  65  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  66  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  67  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  68  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  69  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  70  * SUCH DAMAGE.
  71  *
  72  */
  73
  74 #include "includes.h"
  75
  76 #include <sys/types.h>
  77 #ifdef HAVE_SYS_STAT_H
  78 # include <sys/stat.h>
  79 #endif
  80 #include <sys/wait.h>
  81
  82 #include <ctype.h>
  83 #include <dirent.h>
  84 #include <errno.h>
  85 #include <fcntl.h>
  86 #include <pwd.h>
  87 #include <signal.h>
  88 #include <stdarg.h>
  89 #include <unistd.h>
  90
  91 #include "xmalloc.h"
  92 #include "atomicio.h"
  93 #include "pathnames.h"
  94 #include "log.h"
  95 #include "misc.h"
  96 #include "progressmeter.h"
  97
  98 extern char *__progname;
  99
 100 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 101
 102 void bwlimit(int);
 103
 104 /* Struct for addargs */
 105 arglist args;
 106
 107 /* Bandwidth limit */
 108 off_t limit_rate = 0;
 109
 110 /* Name of current file being transferred. */
 111 char *curfile;
 112
 113 /* This is set to non-zero to enable verbose mode. */
 114 int verbose_mode = 0;
 115
 116 /* This is set to zero if the progressmeter is not desired. */
 117 int showprogress = 1;
 118
 119 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 120 char *ssh_program = _PATH_SSH_PROGRAM;
 121
 122 /* This is used to store the pid of ssh_program */
 123 pid_t do_cmd_pid = -1;
 124
 125 static void
 126 killchild(int signo)
 127 {
 128         if (do_cmd_pid > 1) {
 129                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 130                 waitpid(do_cmd_pid, NULL, 0);
 131         }
 132
 133         if (signo)
 134                 _exit(1);
 135         exit(1);
 136 }
 137
 138 static int
 139 do_local_cmd(arglist *a)
 140 {
 141         u_int i;
 142         int status;
 143         pid_t pid;
 144
 145         if (a->num == 0)
 146                 fatal("do_local_cmd: no arguments");
 147
 148         if (verbose_mode) {
 149                 fprintf(stderr, "Executing:");
 150                 for (i = 0; i < a->num; i++)
 151                         fprintf(stderr, " %s", a->list[i]);
 152                 fprintf(stderr, "\n");
 153         }
 154         if ((pid = fork()) == -1)
 155                 fatal("do_local_cmd: fork: %s", strerror(errno));
 156
 157         if (pid == 0) {
 158                 execvp(a->list[0], a->list);
 159                 perror(a->list[0]);
 160                 exit(1);
 161         }
 162
 163         do_cmd_pid = pid;
 164         signal(SIGTERM, killchild);
 165         signal(SIGINT, killchild);
 166         signal(SIGHUP, killchild);
 167
 168         while (waitpid(pid, &status, 0) == -1)
 169                 if (errno != EINTR)
 170                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 171
 172         do_cmd_pid = -1;
 173
 174         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 175                 return (-1);
 176
 177         return (0);
 178 }
 179
 180 /*
 181  * This function executes the given command as the specified user on the
 182  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 183  * assigns the input and output file descriptors on success.
 184  */
 185
 186 int
 187 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 188 {
 189         int pin[2], pout[2], reserved[2];
 190
 191         if (verbose_mode)
 192                 fprintf(stderr,
 193                     "Executing: program %s host %s, user %s, command %s\n",
 194                     ssh_program, host,
 195                     remuser ? remuser : "(unspecified)", cmd);
 196
 197         /*
 198          * Reserve two descriptors so that the real pipes won't get
 199          * descriptors 0 and 1 because that will screw up dup2 below.
 200          */
 201         if (pipe(reserved) < 0)
 202                 fatal("pipe: %s", strerror(errno));
 203
 204         /* Create a socket pair for communicating with ssh. */
 205         if (pipe(pin) < 0)
 206                 fatal("pipe: %s", strerror(errno));
 207         if (pipe(pout) < 0)
 208                 fatal("pipe: %s", strerror(errno));
 209
 210         /* Free the reserved descriptors. */
 211         close(reserved[0]);
 212         close(reserved[1]);
 213
 214         /* Fork a child to execute the command on the remote host using ssh. */
 215         do_cmd_pid = fork();
 216         if (do_cmd_pid == 0) {
 217                 /* Child. */
 218                 close(pin[1]);
 219                 close(pout[0]);
 220                 dup2(pin[0], 0);
 221                 dup2(pout[1], 1);
 222                 close(pin[0]);
 223                 close(pout[1]);
 224
 225                 replacearg(&args, 0, "%s", ssh_program);
 226                 if (remuser != NULL)
 227                         addargs(&args, "-l%s", remuser);
 228                 addargs(&args, "%s", host);
 229                 addargs(&args, "%s", cmd);
 230
 231                 execvp(ssh_program, args.list);
 232                 perror(ssh_program);
 233                 exit(1);
 234         } else if (do_cmd_pid == -1) {
 235                 fatal("fork: %s", strerror(errno));
 236         }
 237         /* Parent.  Close the other side, and return the local side. */
 238         close(pin[0]);
 239         *fdout = pin[1];
 240         close(pout[1]);
 241         *fdin = pout[0];
 242         signal(SIGTERM, killchild);
 243         signal(SIGINT, killchild);
 244         signal(SIGHUP, killchild);
 245         return 0;
 246 }
 247
 248 typedef struct {
 249         size_t cnt;
 250         char *buf;
 251 } BUF;
 252
 253 BUF *allocbuf(BUF *, int, int);
 254 void lostconn(int);
 255 int okname(char *);
 256 void run_err(const char *,...);
 257 void verifydir(char *);
 258
 259 struct passwd *pwd;
 260 uid_t userid;
 261 int errs, remin, remout;
 262 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 263
 264 #define CMDNEEDS        64
 265 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 266
 267 int response(void);
 268 void rsource(char *, struct stat *);
 269 void sink(int, char *[]);
 270 void source(int, char *[]);
 271 void tolocal(int, char *[]);
 272 void toremote(char *, int, char *[]);
 273 void usage(void);
 274
 275 int
 276 main(int argc, char **argv)
 277 {
 278         int ch, fflag, tflag, status, n;
 279         double speed;
 280         char *targ, *endp, **newargv;
 281         extern char *optarg;
 282         extern int optind;
 283
 284         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 285         sanitise_stdfd();
 286
 287         /* Copy argv, because we modify it */
 288         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 289         for (n = 0; n < argc; n++)
 290                 newargv[n] = xstrdup(argv[n]);
 291         argv = newargv;
 292
 293         __progname = ssh_get_progname(argv[0]);
 294
 295         memset(&args, '\0', sizeof(args));
 296         args.list = NULL;
 297         addargs(&args, "%s", ssh_program);
 298         addargs(&args, "-x");
 299         addargs(&args, "-oForwardAgent no");
 300         addargs(&args, "-oPermitLocalCommand no");
 301         addargs(&args, "-oClearAllForwardings yes");
 302
 303         fflag = tflag = 0;
 304         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 305                 switch (ch) {
 306                 /* User-visible flags. */
 307                 case '1':
 308                 case '2':
 309                 case '4':
 310                 case '6':
 311                 case 'C':
 312                         addargs(&args, "-%c", ch);
 313                         break;
 314                 case 'o':
 315                 case 'c':
 316                 case 'i':
 317                 case 'F':
 318                         addargs(&args, "-%c%s", ch, optarg);
 319                         break;
 320                 case 'P':
 321                         addargs(&args, "-p%s", optarg);
 322                         break;
 323                 case 'B':
 324                         addargs(&args, "-oBatchmode yes");
 325                         break;
 326                 case 'l':
 327                         speed = strtod(optarg, &endp);
 328                         if (speed <= 0 || *endp != '\0')
 329                                 usage();
 330                         limit_rate = speed * 1024;
 331                         break;
 332                 case 'p':
 333                         pflag = 1;
 334                         break;
 335                 case 'r':
 336                         iamrecursive = 1;
 337                         break;
 338                 case 'S':
 339                         ssh_program = xstrdup(optarg);
 340                         break;
 341                 case 'v':
 342                         addargs(&args, "-v");
 343                         verbose_mode = 1;
 344                         break;
 345                 case 'q':
 346                         addargs(&args, "-q");
 347                         showprogress = 0;
 348                         break;
 349
 350                 /* Server options. */
 351                 case 'd':
 352                         targetshouldbedirectory = 1;
 353                         break;
 354                 case 'f':       /* "from" */
 355                         iamremote = 1;
 356                         fflag = 1;
 357                         break;
 358                 case 't':       /* "to" */
 359                         iamremote = 1;
 360                         tflag = 1;
 361 #ifdef HAVE_CYGWIN
 362                         setmode(0, O_BINARY);
 363 #endif
 364                         break;
 365                 default:
 366                         usage();
 367                 }
 368         argc -= optind;
 369         argv += optind;
 370
 371         if ((pwd = getpwuid(userid = getuid())) == NULL)
 372                 fatal("unknown user %u", (u_int) userid);
 373
 374         if (!isatty(STDERR_FILENO))
 375                 showprogress = 0;
 376
 377         remin = STDIN_FILENO;
 378         remout = STDOUT_FILENO;
 379
 380         if (fflag) {
 381                 /* Follow "protocol", send data. */
 382                 (void) response();
 383                 source(argc, argv);
 384                 exit(errs != 0);
 385         }
 386         if (tflag) {
 387                 /* Receive data. */
 388                 sink(argc, argv);
 389                 exit(errs != 0);
 390         }
 391         if (argc < 2)
 392                 usage();
 393         if (argc > 2)
 394                 targetshouldbedirectory = 1;
 395
 396         remin = remout = -1;
 397         do_cmd_pid = -1;
 398         /* Command to be executed on remote system using "ssh". */
 399         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 400             verbose_mode ? " -v" : "",
 401             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 402             targetshouldbedirectory ? " -d" : "");
 403
 404         (void) signal(SIGPIPE, lostconn);
 405
 406         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 407                 toremote(targ, argc, argv);
 408         else {
 409                 if (targetshouldbedirectory)
 410                         verifydir(argv[argc - 1]);
 411                 tolocal(argc, argv);    /* Dest is local host. */
 412         }
 413         /*
 414          * Finally check the exit status of the ssh process, if one was forked
 415          * and no error has occured yet
 416          */
 417         if (do_cmd_pid != -1 && errs == 0) {
 418                 if (remin != -1)
 419                     (void) close(remin);
 420                 if (remout != -1)
 421                     (void) close(remout);
 422                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 423                         errs = 1;
 424                 else {
 425                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 426                                 errs = 1;
 427                 }
 428         }
 429         exit(errs != 0);
 430 }
 431
 432 void
 433 toremote(char *targ, int argc, char **argv)
 434 {
 435         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 436         arglist alist;
 437         int i;
 438
 439         memset(&alist, '\0', sizeof(alist));
 440         alist.list = NULL;
 441
 442         *targ++ = 0;
 443         if (*targ == 0)
 444                 targ = ".";
 445
 446         arg = xstrdup(argv[argc - 1]);
 447         if ((thost = strrchr(arg, '@'))) {
 448                 /* user@host */
 449                 *thost++ = 0;
 450                 tuser = arg;
 451                 if (*tuser == '\0')
 452                         tuser = NULL;
 453         } else {
 454                 thost = arg;
 455                 tuser = NULL;
 456         }
 457
 458         if (tuser != NULL && !okname(tuser)) {
 459                 xfree(arg);
 460                 return;
 461         }
 462
 463         for (i = 0; i < argc - 1; i++) {
 464                 src = colon(argv[i]);
 465                 if (src) {      /* remote to remote */
 466                         freeargs(&alist);
 467                         addargs(&alist, "%s", ssh_program);
 468                         if (verbose_mode)
 469                                 addargs(&alist, "-v");
 470                         addargs(&alist, "-x");
 471                         addargs(&alist, "-oClearAllForwardings yes");
 472                         addargs(&alist, "-n");
 473
 474                         *src++ = 0;
 475                         if (*src == 0)
 476                                 src = ".";
 477                         host = strrchr(argv[i], '@');
 478
 479                         if (host) {
 480                                 *host++ = 0;
 481                                 host = cleanhostname(host);
 482                                 suser = argv[i];
 483                                 if (*suser == '\0')
 484                                         suser = pwd->pw_name;
 485                                 else if (!okname(suser))
 486                                         continue;
 487                                 addargs(&alist, "-l");
 488                                 addargs(&alist, "%s", suser);
 489                         } else {
 490                                 host = cleanhostname(argv[i]);
 491                         }
 492                         addargs(&alist, "%s", host);
 493                         addargs(&alist, "%s", cmd);
 494                         addargs(&alist, "%s", src);
 495                         addargs(&alist, "%s%s%s:%s",
 496                             tuser ? tuser : "", tuser ? "@" : "",
 497                             thost, targ);
 498                         if (do_local_cmd(&alist) != 0)
 499                                 errs = 1;
 500                 } else {        /* local to remote */
 501                         if (remin == -1) {
 502                                 xasprintf(&bp, "%s -t %s", cmd, targ);
 503                                 host = cleanhostname(thost);
 504                                 if (do_cmd(host, tuser, bp, &remin,
 505                                     &remout) < 0)
 506                                         exit(1);
 507                                 if (response() < 0)
 508                                         exit(1);
 509                                 (void) xfree(bp);
 510                         }
 511                         source(1, argv + i);
 512                 }
 513         }
 514         xfree(arg);
 515 }
 516
 517 void
 518 tolocal(int argc, char **argv)
 519 {
 520         char *bp, *host, *src, *suser;
 521         arglist alist;
 522         int i;
 523
 524         memset(&alist, '\0', sizeof(alist));
 525         alist.list = NULL;
 526
 527         for (i = 0; i < argc - 1; i++) {
 528                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 529                         freeargs(&alist);
 530                         addargs(&alist, "%s", _PATH_CP);
 531                         if (iamrecursive)
 532                                 addargs(&alist, "-r");
 533                         if (pflag)
 534                                 addargs(&alist, "-p");
 535                         addargs(&alist, "%s", argv[i]);
 536                         addargs(&alist, "%s", argv[argc-1]);
 537                         if (do_local_cmd(&alist))
 538                                 ++errs;
 539                         continue;
 540                 }
 541                 *src++ = 0;
 542                 if (*src == 0)
 543                         src = ".";
 544                 if ((host = strrchr(argv[i], '@')) == NULL) {
 545                         host = argv[i];
 546                         suser = NULL;
 547                 } else {
 548                         *host++ = 0;
 549                         suser = argv[i];
 550                         if (*suser == '\0')
 551                                 suser = pwd->pw_name;
 552                 }
 553                 host = cleanhostname(host);
 554                 xasprintf(&bp, "%s -f %s", cmd, src);
 555                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 556                         (void) xfree(bp);
 557                         ++errs;
 558                         continue;
 559                 }
 560                 xfree(bp);
 561                 sink(1, argv + argc - 1);
 562                 (void) close(remin);
 563                 remin = remout = -1;
 564         }
 565 }
 566
 567 void
 568 source(int argc, char **argv)
 569 {
 570         struct stat stb;
 571         static BUF buffer;
 572         BUF *bp;
 573         off_t i, amt, statbytes;
 574         size_t result;
 575         int fd = -1, haderr, indx;
 576         char *last, *name, buf[2048];
 577         int len;
 578
 579         for (indx = 0; indx < argc; ++indx) {
 580                 name = argv[indx];
 581                 statbytes = 0;
 582                 len = strlen(name);
 583                 while (len > 1 && name[len-1] == '/')
 584                         name[--len] = '\0';
 585                 if (strchr(name, '\n') != NULL) {
 586                         run_err("%s: skipping, filename contains a newline",
 587                             name);
 588                         goto next;
 589                 }
 590                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 591                         goto syserr;
 592                 if (fstat(fd, &stb) < 0) {
 593 syserr:                 run_err("%s: %s", name, strerror(errno));
 594                         goto next;
 595                 }
 596                 switch (stb.st_mode & S_IFMT) {
 597                 case S_IFREG:
 598                         break;
 599                 case S_IFDIR:
 600                         if (iamrecursive) {
 601                                 rsource(name, &stb);
 602                                 goto next;
 603                         }
 604                         /* FALLTHROUGH */
 605                 default:
 606                         run_err("%s: not a regular file", name);
 607                         goto next;
 608                 }
 609                 if ((last = strrchr(name, '/')) == NULL)
 610                         last = name;
 611                 else
 612                         ++last;
 613                 curfile = last;
 614                 if (pflag) {
 615                         /*
 616                          * Make it compatible with possible future
 617                          * versions expecting microseconds.
 618                          */
 619                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 620                             (u_long) stb.st_mtime,
 621                             (u_long) stb.st_atime);
 622                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 623                         if (response() < 0)
 624                                 goto next;
 625                 }
 626 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 627                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 628                     (u_int) (stb.st_mode & FILEMODEMASK),
 629                     (long long)stb.st_size, last);
 630                 if (verbose_mode) {
 631                         fprintf(stderr, "Sending file modes: %s", buf);
 632                 }
 633                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 634                 if (response() < 0)
 635                         goto next;
 636                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 637 next:                   if (fd != -1) {
 638                                 (void) close(fd);
 639                                 fd = -1;
 640                         }
 641                         continue;
 642                 }
 643                 if (showprogress)
 644                         start_progress_meter(curfile, stb.st_size, &statbytes);
 645                 /* Keep writing after an error so that we stay sync'd up. */
 646                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 647                         amt = bp->cnt;
 648                         if (i + amt > stb.st_size)
 649                                 amt = stb.st_size - i;
 650                         if (!haderr) {
 651                                 result = atomicio(read, fd, bp->buf, amt);
 652                                 if (result != amt)
 653                                         haderr = errno;
 654                         }
 655                         if (haderr)
 656                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 657                         else {
 658                                 result = atomicio(vwrite, remout, bp->buf, amt);
 659                                 if (result != amt)
 660                                         haderr = errno;
 661                                 statbytes += result;
 662                         }
 663                         if (limit_rate)
 664                                 bwlimit(amt);
 665                 }
 666                 if (showprogress)
 667                         stop_progress_meter();
 668
 669                 if (fd != -1) {
 670                         if (close(fd) < 0 && !haderr)
 671                                 haderr = errno;
 672                         fd = -1;
 673                 }
 674                 if (!haderr)
 675                         (void) atomicio(vwrite, remout, "", 1);
 676                 else
 677                         run_err("%s: %s", name, strerror(haderr));
 678                 (void) response();
 679         }
 680 }
 681
 682 void
 683 rsource(char *name, struct stat *statp)
 684 {
 685         DIR *dirp;
 686         struct dirent *dp;
 687         char *last, *vect[1], path[1100];
 688
 689         if (!(dirp = opendir(name))) {
 690                 run_err("%s: %s", name, strerror(errno));
 691                 return;
 692         }
 693         last = strrchr(name, '/');
 694         if (last == 0)
 695                 last = name;
 696         else
 697                 last++;
 698         if (pflag) {
 699                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 700                     (u_long) statp->st_mtime,
 701                     (u_long) statp->st_atime);
 702                 (void) atomicio(vwrite, remout, path, strlen(path));
 703                 if (response() < 0) {
 704                         closedir(dirp);
 705                         return;
 706                 }
 707         }
 708         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 709             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 710         if (verbose_mode)
 711                 fprintf(stderr, "Entering directory: %s", path);
 712         (void) atomicio(vwrite, remout, path, strlen(path));
 713         if (response() < 0) {
 714                 closedir(dirp);
 715                 return;
 716         }
 717         while ((dp = readdir(dirp)) != NULL) {
 718                 if (dp->d_ino == 0)
 719                         continue;
 720                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 721                         continue;
 722                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 723                         run_err("%s/%s: name too long", name, dp->d_name);
 724                         continue;
 725                 }
 726                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 727                 vect[0] = path;
 728                 source(1, vect);
 729         }
 730         (void) closedir(dirp);
 731         (void) atomicio(vwrite, remout, "E\n", 2);
 732         (void) response();
 733 }
 734
 735 void
 736 bwlimit(int amount)
 737 {
 738         static struct timeval bwstart, bwend;
 739         static int lamt, thresh = 16384;
 740         u_int64_t waitlen;
 741         struct timespec ts, rm;
 742
 743         if (!timerisset(&bwstart)) {
 744                 gettimeofday(&bwstart, NULL);
 745                 return;
 746         }
 747
 748         lamt += amount;
 749         if (lamt < thresh)
 750                 return;
 751
 752         gettimeofday(&bwend, NULL);
 753         timersub(&bwend, &bwstart, &bwend);
 754         if (!timerisset(&bwend))
 755                 return;
 756
 757         lamt *= 8;
 758         waitlen = (double)1000000L * lamt / limit_rate;
 759
 760         bwstart.tv_sec = waitlen / 1000000L;
 761         bwstart.tv_usec = waitlen % 1000000L;
 762
 763         if (timercmp(&bwstart, &bwend, >)) {
 764                 timersub(&bwstart, &bwend, &bwend);
 765
 766                 /* Adjust the wait time */
 767                 if (bwend.tv_sec) {
 768                         thresh /= 2;
 769                         if (thresh < 2048)
 770                                 thresh = 2048;
 771                 } else if (bwend.tv_usec < 100) {
 772                         thresh *= 2;
 773                         if (thresh > 32768)
 774                                 thresh = 32768;
 775                 }
 776
 777                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 778                 while (nanosleep(&ts, &rm) == -1) {
 779                         if (errno != EINTR)
 780                                 break;
 781                         ts = rm;
 782                 }
 783         }
 784
 785         lamt = 0;
 786         gettimeofday(&bwstart, NULL);
 787 }
 788
 789 void
 790 sink(int argc, char **argv)
 791 {
 792         static BUF buffer;
 793         struct stat stb;
 794         enum {
 795                 YES, NO, DISPLAYED
 796         } wrerr;
 797         BUF *bp;
 798         off_t i;
 799         size_t j, count;
 800         int amt, exists, first, ofd;
 801         mode_t mode, omode, mask;
 802         off_t size, statbytes;
 803         int setimes, targisdir, wrerrno = 0;
 804         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 805         struct timeval tv[2];
 806
 807 #define atime   tv[0]
 808 #define mtime   tv[1]
 809 #define SCREWUP(str)    { why = str; goto screwup; }
 810
 811         setimes = targisdir = 0;
 812         mask = umask(0);
 813         if (!pflag)
 814                 (void) umask(mask);
 815         if (argc != 1) {
 816                 run_err("ambiguous target");
 817                 exit(1);
 818         }
 819         targ = *argv;
 820         if (targetshouldbedirectory)
 821                 verifydir(targ);
 822
 823         (void) atomicio(vwrite, remout, "", 1);
 824         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 825                 targisdir = 1;
 826         for (first = 1;; first = 0) {
 827                 cp = buf;
 828                 if (atomicio(read, remin, cp, 1) != 1)
 829                         return;
 830                 if (*cp++ == '\n')
 831                         SCREWUP("unexpected <newline>");
 832                 do {
 833                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 834                                 SCREWUP("lost connection");
 835                         *cp++ = ch;
 836                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 837                 *cp = 0;
 838                 if (verbose_mode)
 839                         fprintf(stderr, "Sink: %s", buf);
 840
 841                 if (buf[0] == '\01' || buf[0] == '\02') {
 842                         if (iamremote == 0)
 843                                 (void) atomicio(vwrite, STDERR_FILENO,
 844                                     buf + 1, strlen(buf + 1));
 845                         if (buf[0] == '\02')
 846                                 exit(1);
 847                         ++errs;
 848                         continue;
 849                 }
 850                 if (buf[0] == 'E') {
 851                         (void) atomicio(vwrite, remout, "", 1);
 852                         return;
 853                 }
 854                 if (ch == '\n')
 855                         *--cp = 0;
 856
 857                 cp = buf;
 858                 if (*cp == 'T') {
 859                         setimes++;
 860                         cp++;
 861                         mtime.tv_sec = strtol(cp, &cp, 10);
 862                         if (!cp || *cp++ != ' ')
 863                                 SCREWUP("mtime.sec not delimited");
 864                         mtime.tv_usec = strtol(cp, &cp, 10);
 865                         if (!cp || *cp++ != ' ')
 866                                 SCREWUP("mtime.usec not delimited");
 867                         atime.tv_sec = strtol(cp, &cp, 10);
 868                         if (!cp || *cp++ != ' ')
 869                                 SCREWUP("atime.sec not delimited");
 870                         atime.tv_usec = strtol(cp, &cp, 10);
 871                         if (!cp || *cp++ != '\0')
 872                                 SCREWUP("atime.usec not delimited");
 873                         (void) atomicio(vwrite, remout, "", 1);
 874                         continue;
 875                 }
 876                 if (*cp != 'C' && *cp != 'D') {
 877                         /*
 878                          * Check for the case "rcp remote:foo\* local:bar".
 879                          * In this case, the line "No match." can be returned
 880                          * by the shell before the rcp command on the remote is
 881                          * executed so the ^Aerror_message convention isn't
 882                          * followed.
 883                          */
 884                         if (first) {
 885                                 run_err("%s", cp);
 886                                 exit(1);
 887                         }
 888                         SCREWUP("expected control record");
 889                 }
 890                 mode = 0;
 891                 for (++cp; cp < buf + 5; cp++) {
 892                         if (*cp < '0' || *cp > '7')
 893                                 SCREWUP("bad mode");
 894                         mode = (mode << 3) | (*cp - '0');
 895                 }
 896                 if (*cp++ != ' ')
 897                         SCREWUP("mode not delimited");
 898
 899                 for (size = 0; isdigit(*cp);)
 900                         size = size * 10 + (*cp++ - '0');
 901                 if (*cp++ != ' ')
 902                         SCREWUP("size not delimited");
 903                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 904                         run_err("error: unexpected filename: %s", cp);
 905                         exit(1);
 906                 }
 907                 if (targisdir) {
 908                         static char *namebuf;
 909                         static size_t cursize;
 910                         size_t need;
 911
 912                         need = strlen(targ) + strlen(cp) + 250;
 913                         if (need > cursize) {
 914                                 if (namebuf)
 915                                         xfree(namebuf);
 916                                 namebuf = xmalloc(need);
 917                                 cursize = need;
 918                         }
 919                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 920                             strcmp(targ, "/") ? "/" : "", cp);
 921                         np = namebuf;
 922                 } else
 923                         np = targ;
 924                 curfile = cp;
 925                 exists = stat(np, &stb) == 0;
 926                 if (buf[0] == 'D') {
 927                         int mod_flag = pflag;
 928                         if (!iamrecursive)
 929                                 SCREWUP("received directory without -r");
 930                         if (exists) {
 931                                 if (!S_ISDIR(stb.st_mode)) {
 932                                         errno = ENOTDIR;
 933                                         goto bad;
 934                                 }
 935                                 if (pflag)
 936                                         (void) chmod(np, mode);
 937                         } else {
 938                                 /* Handle copying from a read-only
 939                                    directory */
 940                                 mod_flag = 1;
 941                                 if (mkdir(np, mode | S_IRWXU) < 0)
 942                                         goto bad;
 943                         }
 944                         vect[0] = xstrdup(np);
 945                         sink(1, vect);
 946                         if (setimes) {
 947                                 setimes = 0;
 948                                 if (utimes(vect[0], tv) < 0)
 949                                         run_err("%s: set times: %s",
 950                                             vect[0], strerror(errno));
 951                         }
 952                         if (mod_flag)
 953                                 (void) chmod(vect[0], mode);
 954                         if (vect[0])
 955                                 xfree(vect[0]);
 956                         continue;
 957                 }
 958                 omode = mode;
 959                 mode |= S_IWRITE;
 960                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 961 bad:                    run_err("%s: %s", np, strerror(errno));
 962                         continue;
 963                 }
 964                 (void) atomicio(vwrite, remout, "", 1);
 965                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 966                         (void) close(ofd);
 967                         continue;
 968                 }
 969                 cp = bp->buf;
 970                 wrerr = NO;
 971
 972                 statbytes = 0;
 973                 if (showprogress)
 974                         start_progress_meter(curfile, size, &statbytes);
 975                 for (count = i = 0; i < size; i += 4096) {
 976                         amt = 4096;
 977                         if (i + amt > size)
 978                                 amt = size - i;
 979                         count += amt;
 980                         do {
 981                                 j = atomicio(read, remin, cp, amt);
 982                                 if (j == 0) {
 983                                         run_err("%s", j ? strerror(errno) :
 984                                             "dropped connection");
 985                                         exit(1);
 986                                 }
 987                                 amt -= j;
 988                                 cp += j;
 989                                 statbytes += j;
 990                         } while (amt > 0);
 991
 992                         if (limit_rate)
 993                                 bwlimit(4096);
 994
 995                         if (count == bp->cnt) {
 996                                 /* Keep reading so we stay sync'd up. */
 997                                 if (wrerr == NO) {
 998                                         if (atomicio(vwrite, ofd, bp->buf,
 999                                             count) != count) {
1000                                                 wrerr = YES;
1001                                                 wrerrno = errno;
1002                                         }
1003                                 }
1004                                 count = 0;
1005                                 cp = bp->buf;
1006                         }
1007                 }
1008                 if (showprogress)
1009                         stop_progress_meter();
1010                 if (count != 0 && wrerr == NO &&
1011                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1012                         wrerr = YES;
1013                         wrerrno = errno;
1014                 }
1015                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
1016                         run_err("%s: truncate: %s", np, strerror(errno));
1017                         wrerr = DISPLAYED;
1018                 }
1019                 if (pflag) {
1020                         if (exists || omode != mode)
1021 #ifdef HAVE_FCHMOD
1022                                 if (fchmod(ofd, omode)) {
1023 #else /* HAVE_FCHMOD */
1024                                 if (chmod(np, omode)) {
1025 #endif /* HAVE_FCHMOD */
1026                                         run_err("%s: set mode: %s",
1027                                             np, strerror(errno));
1028                                         wrerr = DISPLAYED;
1029                                 }
1030                 } else {
1031                         if (!exists && omode != mode)
1032 #ifdef HAVE_FCHMOD
1033                                 if (fchmod(ofd, omode & ~mask)) {
1034 #else /* HAVE_FCHMOD */
1035                                 if (chmod(np, omode & ~mask)) {
1036 #endif /* HAVE_FCHMOD */
1037                                         run_err("%s: set mode: %s",
1038                                             np, strerror(errno));
1039                                         wrerr = DISPLAYED;
1040                                 }
1041                 }
1042                 if (close(ofd) == -1) {
1043                         wrerr = YES;
1044                         wrerrno = errno;
1045                 }
1046                 (void) response();
1047                 if (setimes && wrerr == NO) {
1048                         setimes = 0;
1049                         if (utimes(np, tv) < 0) {
1050                                 run_err("%s: set times: %s",
1051                                     np, strerror(errno));
1052                                 wrerr = DISPLAYED;
1053                         }
1054                 }
1055                 switch (wrerr) {
1056                 case YES:
1057                         run_err("%s: %s", np, strerror(wrerrno));
1058                         break;
1059                 case NO:
1060                         (void) atomicio(vwrite, remout, "", 1);
1061                         break;
1062                 case DISPLAYED:
1063                         break;
1064                 }
1065         }
1066 screwup:
1067         run_err("protocol error: %s", why);
1068         exit(1);
1069 }
1070
1071 int
1072 response(void)
1073 {
1074         char ch, *cp, resp, rbuf[2048];
1075
1076         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1077                 lostconn(0);
1078
1079         cp = rbuf;
1080         switch (resp) {
1081         case 0:         /* ok */
1082                 return (0);
1083         default:
1084                 *cp++ = resp;
1085                 /* FALLTHROUGH */
1086         case 1:         /* error, followed by error msg */
1087         case 2:         /* fatal error, "" */
1088                 do {
1089                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1090                                 lostconn(0);
1091                         *cp++ = ch;
1092                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1093
1094                 if (!iamremote)
1095                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1096                 ++errs;
1097                 if (resp == 1)
1098                         return (-1);
1099                 exit(1);
1100         }
1101         /* NOTREACHED */
1102 }
1103
1104 void
1105 usage(void)
1106 {
1107         (void) fprintf(stderr,
1108             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1109             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1110             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1111         exit(1);
1112 }
1113
1114 void
1115 run_err(const char *fmt,...)
1116 {
1117         static FILE *fp;
1118         va_list ap;
1119
1120         ++errs;
1121         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1122                 (void) fprintf(fp, "%c", 0x01);
1123                 (void) fprintf(fp, "scp: ");
1124                 va_start(ap, fmt);
1125                 (void) vfprintf(fp, fmt, ap);
1126                 va_end(ap);
1127                 (void) fprintf(fp, "\n");
1128                 (void) fflush(fp);
1129         }
1130
1131         if (!iamremote) {
1132                 va_start(ap, fmt);
1133                 vfprintf(stderr, fmt, ap);
1134                 va_end(ap);
1135                 fprintf(stderr, "\n");
1136         }
1137 }
1138
1139 void
1140 verifydir(char *cp)
1141 {
1142         struct stat stb;
1143
1144         if (!stat(cp, &stb)) {
1145                 if (S_ISDIR(stb.st_mode))
1146                         return;
1147                 errno = ENOTDIR;
1148         }
1149         run_err("%s: %s", cp, strerror(errno));
1150         killchild(0);
1151 }
1152
1153 int
1154 okname(char *cp0)
1155 {
1156         int c;
1157         char *cp;
1158
1159         cp = cp0;
1160         do {
1161                 c = (int)*cp;
1162                 if (c & 0200)
1163                         goto bad;
1164                 if (!isalpha(c) && !isdigit(c)) {
1165                         switch (c) {
1166                         case '\'':
1167                         case '"':
1168                         case '`':
1169                         case ' ':
1170                         case '#':
1171                                 goto bad;
1172                         default:
1173                                 break;
1174                         }
1175                 }
1176         } while (*++cp);
1177         return (1);
1178
1179 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1180         return (0);
1181 }
1182
1183 BUF *
1184 allocbuf(BUF *bp, int fd, int blksize)
1185 {
1186         size_t size;
1187 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1188         struct stat stb;
1189
1190         if (fstat(fd, &stb) < 0) {
1191                 run_err("fstat: %s", strerror(errno));
1192                 return (0);
1193         }
1194         size = roundup(stb.st_blksize, blksize);
1195         if (size == 0)
1196                 size = blksize;
1197 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1198         size = blksize;
1199 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1200         if (bp->cnt >= size)
1201                 return (bp);
1202         if (bp->buf == NULL)
1203                 bp->buf = xmalloc(size);
1204         else
1205                 bp->buf = xrealloc(bp->buf, 1, size);
1206         memset(bp->buf, 0, size);
1207         bp->cnt = size;
1208         return (bp);
1209 }
1210
1211 void
1212 lostconn(int signo)
1213 {
1214         if (!iamremote)
1215                 write(STDERR_FILENO, "lost connection\n", 16);
1216         if (signo)
1217                 _exit(1);
1218         else
1219                 exit(1);
1220 }