scp.c

   1 /* $OpenBSD: scp.c,v 1.149 2006/07/22 19:08:54 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 <time.h>
  90 #include <unistd.h>
  91
  92 #include "xmalloc.h"
  93 #include "atomicio.h"
  94 #include "pathnames.h"
  95 #include "log.h"
  96 #include "misc.h"
  97 #include "progressmeter.h"
  98
  99 extern char *__progname;
 100
 101 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 102
 103 void bwlimit(int);
 104
 105 /* Struct for addargs */
 106 arglist args;
 107
 108 /* Bandwidth limit */
 109 off_t limit_rate = 0;
 110
 111 /* Name of current file being transferred. */
 112 char *curfile;
 113
 114 /* This is set to non-zero to enable verbose mode. */
 115 int verbose_mode = 0;
 116
 117 /* This is set to zero if the progressmeter is not desired. */
 118 int showprogress = 1;
 119
 120 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 121 char *ssh_program = _PATH_SSH_PROGRAM;
 122
 123 /* This is used to store the pid of ssh_program */
 124 pid_t do_cmd_pid = -1;
 125
 126 static void
 127 killchild(int signo)
 128 {
 129         if (do_cmd_pid > 1) {
 130                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 131                 waitpid(do_cmd_pid, NULL, 0);
 132         }
 133
 134         if (signo)
 135                 _exit(1);
 136         exit(1);
 137 }
 138
 139 static int
 140 do_local_cmd(arglist *a)
 141 {
 142         u_int i;
 143         int status;
 144         pid_t pid;
 145
 146         if (a->num == 0)
 147                 fatal("do_local_cmd: no arguments");
 148
 149         if (verbose_mode) {
 150                 fprintf(stderr, "Executing:");
 151                 for (i = 0; i < a->num; i++)
 152                         fprintf(stderr, " %s", a->list[i]);
 153                 fprintf(stderr, "\n");
 154         }
 155         if ((pid = fork()) == -1)
 156                 fatal("do_local_cmd: fork: %s", strerror(errno));
 157
 158         if (pid == 0) {
 159                 execvp(a->list[0], a->list);
 160                 perror(a->list[0]);
 161                 exit(1);
 162         }
 163
 164         do_cmd_pid = pid;
 165         signal(SIGTERM, killchild);
 166         signal(SIGINT, killchild);
 167         signal(SIGHUP, killchild);
 168
 169         while (waitpid(pid, &status, 0) == -1)
 170                 if (errno != EINTR)
 171                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 172
 173         do_cmd_pid = -1;
 174
 175         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 176                 return (-1);
 177
 178         return (0);
 179 }
 180
 181 /*
 182  * This function executes the given command as the specified user on the
 183  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 184  * assigns the input and output file descriptors on success.
 185  */
 186
 187 int
 188 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 189 {
 190         int pin[2], pout[2], reserved[2];
 191
 192         if (verbose_mode)
 193                 fprintf(stderr,
 194                     "Executing: program %s host %s, user %s, command %s\n",
 195                     ssh_program, host,
 196                     remuser ? remuser : "(unspecified)", cmd);
 197
 198         /*
 199          * Reserve two descriptors so that the real pipes won't get
 200          * descriptors 0 and 1 because that will screw up dup2 below.
 201          */
 202         if (pipe(reserved) < 0)
 203                 fatal("pipe: %s", strerror(errno));
 204
 205         /* Create a socket pair for communicating with ssh. */
 206         if (pipe(pin) < 0)
 207                 fatal("pipe: %s", strerror(errno));
 208         if (pipe(pout) < 0)
 209                 fatal("pipe: %s", strerror(errno));
 210
 211         /* Free the reserved descriptors. */
 212         close(reserved[0]);
 213         close(reserved[1]);
 214
 215         /* Fork a child to execute the command on the remote host using ssh. */
 216         do_cmd_pid = fork();
 217         if (do_cmd_pid == 0) {
 218                 /* Child. */
 219                 close(pin[1]);
 220                 close(pout[0]);
 221                 dup2(pin[0], 0);
 222                 dup2(pout[1], 1);
 223                 close(pin[0]);
 224                 close(pout[1]);
 225
 226                 replacearg(&args, 0, "%s", ssh_program);
 227                 if (remuser != NULL)
 228                         addargs(&args, "-l%s", remuser);
 229                 addargs(&args, "%s", host);
 230                 addargs(&args, "%s", cmd);
 231
 232                 execvp(ssh_program, args.list);
 233                 perror(ssh_program);
 234                 exit(1);
 235         } else if (do_cmd_pid == -1) {
 236                 fatal("fork: %s", strerror(errno));
 237         }
 238         /* Parent.  Close the other side, and return the local side. */
 239         close(pin[0]);
 240         *fdout = pin[1];
 241         close(pout[1]);
 242         *fdin = pout[0];
 243         signal(SIGTERM, killchild);
 244         signal(SIGINT, killchild);
 245         signal(SIGHUP, killchild);
 246         return 0;
 247 }
 248
 249 typedef struct {
 250         size_t cnt;
 251         char *buf;
 252 } BUF;
 253
 254 BUF *allocbuf(BUF *, int, int);
 255 void lostconn(int);
 256 int okname(char *);
 257 void run_err(const char *,...);
 258 void verifydir(char *);
 259
 260 struct passwd *pwd;
 261 uid_t userid;
 262 int errs, remin, remout;
 263 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 264
 265 #define CMDNEEDS        64
 266 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 267
 268 int response(void);
 269 void rsource(char *, struct stat *);
 270 void sink(int, char *[]);
 271 void source(int, char *[]);
 272 void tolocal(int, char *[]);
 273 void toremote(char *, int, char *[]);
 274 void usage(void);
 275
 276 int
 277 main(int argc, char **argv)
 278 {
 279         int ch, fflag, tflag, status, n;
 280         double speed;
 281         char *targ, *endp, **newargv;
 282         extern char *optarg;
 283         extern int optind;
 284
 285         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 286         sanitise_stdfd();
 287
 288         /* Copy argv, because we modify it */
 289         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 290         for (n = 0; n < argc; n++)
 291                 newargv[n] = xstrdup(argv[n]);
 292         argv = newargv;
 293
 294         __progname = ssh_get_progname(argv[0]);
 295
 296         memset(&args, '\0', sizeof(args));
 297         args.list = NULL;
 298         addargs(&args, "%s", ssh_program);
 299         addargs(&args, "-x");
 300         addargs(&args, "-oForwardAgent no");
 301         addargs(&args, "-oPermitLocalCommand no");
 302         addargs(&args, "-oClearAllForwardings yes");
 303
 304         fflag = tflag = 0;
 305         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 306                 switch (ch) {
 307                 /* User-visible flags. */
 308                 case '1':
 309                 case '2':
 310                 case '4':
 311                 case '6':
 312                 case 'C':
 313                         addargs(&args, "-%c", ch);
 314                         break;
 315                 case 'o':
 316                 case 'c':
 317                 case 'i':
 318                 case 'F':
 319                         addargs(&args, "-%c%s", ch, optarg);
 320                         break;
 321                 case 'P':
 322                         addargs(&args, "-p%s", optarg);
 323                         break;
 324                 case 'B':
 325                         addargs(&args, "-oBatchmode yes");
 326                         break;
 327                 case 'l':
 328                         speed = strtod(optarg, &endp);
 329                         if (speed <= 0 || *endp != '\0')
 330                                 usage();
 331                         limit_rate = speed * 1024;
 332                         break;
 333                 case 'p':
 334                         pflag = 1;
 335                         break;
 336                 case 'r':
 337                         iamrecursive = 1;
 338                         break;
 339                 case 'S':
 340                         ssh_program = xstrdup(optarg);
 341                         break;
 342                 case 'v':
 343                         addargs(&args, "-v");
 344                         verbose_mode = 1;
 345                         break;
 346                 case 'q':
 347                         addargs(&args, "-q");
 348                         showprogress = 0;
 349                         break;
 350
 351                 /* Server options. */
 352                 case 'd':
 353                         targetshouldbedirectory = 1;
 354                         break;
 355                 case 'f':       /* "from" */
 356                         iamremote = 1;
 357                         fflag = 1;
 358                         break;
 359                 case 't':       /* "to" */
 360                         iamremote = 1;
 361                         tflag = 1;
 362 #ifdef HAVE_CYGWIN
 363                         setmode(0, O_BINARY);
 364 #endif
 365                         break;
 366                 default:
 367                         usage();
 368                 }
 369         argc -= optind;
 370         argv += optind;
 371
 372         if ((pwd = getpwuid(userid = getuid())) == NULL)
 373                 fatal("unknown user %u", (u_int) userid);
 374
 375         if (!isatty(STDERR_FILENO))
 376                 showprogress = 0;
 377
 378         remin = STDIN_FILENO;
 379         remout = STDOUT_FILENO;
 380
 381         if (fflag) {
 382                 /* Follow "protocol", send data. */
 383                 (void) response();
 384                 source(argc, argv);
 385                 exit(errs != 0);
 386         }
 387         if (tflag) {
 388                 /* Receive data. */
 389                 sink(argc, argv);
 390                 exit(errs != 0);
 391         }
 392         if (argc < 2)
 393                 usage();
 394         if (argc > 2)
 395                 targetshouldbedirectory = 1;
 396
 397         remin = remout = -1;
 398         do_cmd_pid = -1;
 399         /* Command to be executed on remote system using "ssh". */
 400         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 401             verbose_mode ? " -v" : "",
 402             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 403             targetshouldbedirectory ? " -d" : "");
 404
 405         (void) signal(SIGPIPE, lostconn);
 406
 407         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 408                 toremote(targ, argc, argv);
 409         else {
 410                 if (targetshouldbedirectory)
 411                         verifydir(argv[argc - 1]);
 412                 tolocal(argc, argv);    /* Dest is local host. */
 413         }
 414         /*
 415          * Finally check the exit status of the ssh process, if one was forked
 416          * and no error has occured yet
 417          */
 418         if (do_cmd_pid != -1 && errs == 0) {
 419                 if (remin != -1)
 420                     (void) close(remin);
 421                 if (remout != -1)
 422                     (void) close(remout);
 423                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 424                         errs = 1;
 425                 else {
 426                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 427                                 errs = 1;
 428                 }
 429         }
 430         exit(errs != 0);
 431 }
 432
 433 void
 434 toremote(char *targ, int argc, char **argv)
 435 {
 436         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 437         arglist alist;
 438         int i;
 439
 440         memset(&alist, '\0', sizeof(alist));
 441         alist.list = NULL;
 442
 443         *targ++ = 0;
 444         if (*targ == 0)
 445                 targ = ".";
 446
 447         arg = xstrdup(argv[argc - 1]);
 448         if ((thost = strrchr(arg, '@'))) {
 449                 /* user@host */
 450                 *thost++ = 0;
 451                 tuser = arg;
 452                 if (*tuser == '\0')
 453                         tuser = NULL;
 454         } else {
 455                 thost = arg;
 456                 tuser = NULL;
 457         }
 458
 459         if (tuser != NULL && !okname(tuser)) {
 460                 xfree(arg);
 461                 return;
 462         }
 463
 464         for (i = 0; i < argc - 1; i++) {
 465                 src = colon(argv[i]);
 466                 if (src) {      /* remote to remote */
 467                         freeargs(&alist);
 468                         addargs(&alist, "%s", ssh_program);
 469                         if (verbose_mode)
 470                                 addargs(&alist, "-v");
 471                         addargs(&alist, "-x");
 472                         addargs(&alist, "-oClearAllForwardings yes");
 473                         addargs(&alist, "-n");
 474
 475                         *src++ = 0;
 476                         if (*src == 0)
 477                                 src = ".";
 478                         host = strrchr(argv[i], '@');
 479
 480                         if (host) {
 481                                 *host++ = 0;
 482                                 host = cleanhostname(host);
 483                                 suser = argv[i];
 484                                 if (*suser == '\0')
 485                                         suser = pwd->pw_name;
 486                                 else if (!okname(suser))
 487                                         continue;
 488                                 addargs(&alist, "-l");
 489                                 addargs(&alist, "%s", suser);
 490                         } else {
 491                                 host = cleanhostname(argv[i]);
 492                         }
 493                         addargs(&alist, "%s", host);
 494                         addargs(&alist, "%s", cmd);
 495                         addargs(&alist, "%s", src);
 496                         addargs(&alist, "%s%s%s:%s",
 497                             tuser ? tuser : "", tuser ? "@" : "",
 498                             thost, targ);
 499                         if (do_local_cmd(&alist) != 0)
 500                                 errs = 1;
 501                 } else {        /* local to remote */
 502                         if (remin == -1) {
 503                                 xasprintf(&bp, "%s -t %s", cmd, targ);
 504                                 host = cleanhostname(thost);
 505                                 if (do_cmd(host, tuser, bp, &remin,
 506                                     &remout) < 0)
 507                                         exit(1);
 508                                 if (response() < 0)
 509                                         exit(1);
 510                                 (void) xfree(bp);
 511                         }
 512                         source(1, argv + i);
 513                 }
 514         }
 515         xfree(arg);
 516 }
 517
 518 void
 519 tolocal(int argc, char **argv)
 520 {
 521         char *bp, *host, *src, *suser;
 522         arglist alist;
 523         int i;
 524
 525         memset(&alist, '\0', sizeof(alist));
 526         alist.list = NULL;
 527
 528         for (i = 0; i < argc - 1; i++) {
 529                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 530                         freeargs(&alist);
 531                         addargs(&alist, "%s", _PATH_CP);
 532                         if (iamrecursive)
 533                                 addargs(&alist, "-r");
 534                         if (pflag)
 535                                 addargs(&alist, "-p");
 536                         addargs(&alist, "%s", argv[i]);
 537                         addargs(&alist, "%s", argv[argc-1]);
 538                         if (do_local_cmd(&alist))
 539                                 ++errs;
 540                         continue;
 541                 }
 542                 *src++ = 0;
 543                 if (*src == 0)
 544                         src = ".";
 545                 if ((host = strrchr(argv[i], '@')) == NULL) {
 546                         host = argv[i];
 547                         suser = NULL;
 548                 } else {
 549                         *host++ = 0;
 550                         suser = argv[i];
 551                         if (*suser == '\0')
 552                                 suser = pwd->pw_name;
 553                 }
 554                 host = cleanhostname(host);
 555                 xasprintf(&bp, "%s -f %s", cmd, src);
 556                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 557                         (void) xfree(bp);
 558                         ++errs;
 559                         continue;
 560                 }
 561                 xfree(bp);
 562                 sink(1, argv + argc - 1);
 563                 (void) close(remin);
 564                 remin = remout = -1;
 565         }
 566 }
 567
 568 void
 569 source(int argc, char **argv)
 570 {
 571         struct stat stb;
 572         static BUF buffer;
 573         BUF *bp;
 574         off_t i, amt, statbytes;
 575         size_t result;
 576         int fd = -1, haderr, indx;
 577         char *last, *name, buf[2048];
 578         int len;
 579
 580         for (indx = 0; indx < argc; ++indx) {
 581                 name = argv[indx];
 582                 statbytes = 0;
 583                 len = strlen(name);
 584                 while (len > 1 && name[len-1] == '/')
 585                         name[--len] = '\0';
 586                 if (strchr(name, '\n') != NULL) {
 587                         run_err("%s: skipping, filename contains a newline",
 588                             name);
 589                         goto next;
 590                 }
 591                 if ((fd = open(name, O_RDONLY, 0)) < 0)
 592                         goto syserr;
 593                 if (fstat(fd, &stb) < 0) {
 594 syserr:                 run_err("%s: %s", name, strerror(errno));
 595                         goto next;
 596                 }
 597                 switch (stb.st_mode & S_IFMT) {
 598                 case S_IFREG:
 599                         break;
 600                 case S_IFDIR:
 601                         if (iamrecursive) {
 602                                 rsource(name, &stb);
 603                                 goto next;
 604                         }
 605                         /* FALLTHROUGH */
 606                 default:
 607                         run_err("%s: not a regular file", name);
 608                         goto next;
 609                 }
 610                 if ((last = strrchr(name, '/')) == NULL)
 611                         last = name;
 612                 else
 613                         ++last;
 614                 curfile = last;
 615                 if (pflag) {
 616                         /*
 617                          * Make it compatible with possible future
 618                          * versions expecting microseconds.
 619                          */
 620                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 621                             (u_long) stb.st_mtime,
 622                             (u_long) stb.st_atime);
 623                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 624                         if (response() < 0)
 625                                 goto next;
 626                 }
 627 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 628                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 629                     (u_int) (stb.st_mode & FILEMODEMASK),
 630                     (long long)stb.st_size, last);
 631                 if (verbose_mode) {
 632                         fprintf(stderr, "Sending file modes: %s", buf);
 633                 }
 634                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 635                 if (response() < 0)
 636                         goto next;
 637                 if ((bp = allocbuf(&buffer, fd, 2048)) == NULL) {
 638 next:                   if (fd != -1) {
 639                                 (void) close(fd);
 640                                 fd = -1;
 641                         }
 642                         continue;
 643                 }
 644                 if (showprogress)
 645                         start_progress_meter(curfile, stb.st_size, &statbytes);
 646                 /* Keep writing after an error so that we stay sync'd up. */
 647                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 648                         amt = bp->cnt;
 649                         if (i + amt > stb.st_size)
 650                                 amt = stb.st_size - i;
 651                         if (!haderr) {
 652                                 result = atomicio(read, fd, bp->buf, amt);
 653                                 if (result != amt)
 654                                         haderr = errno;
 655                         }
 656                         if (haderr)
 657                                 (void) atomicio(vwrite, remout, bp->buf, amt);
 658                         else {
 659                                 result = atomicio(vwrite, remout, bp->buf, amt);
 660                                 if (result != amt)
 661                                         haderr = errno;
 662                                 statbytes += result;
 663                         }
 664                         if (limit_rate)
 665                                 bwlimit(amt);
 666                 }
 667                 if (showprogress)
 668                         stop_progress_meter();
 669
 670                 if (fd != -1) {
 671                         if (close(fd) < 0 && !haderr)
 672                                 haderr = errno;
 673                         fd = -1;
 674                 }
 675                 if (!haderr)
 676                         (void) atomicio(vwrite, remout, "", 1);
 677                 else
 678                         run_err("%s: %s", name, strerror(haderr));
 679                 (void) response();
 680         }
 681 }
 682
 683 void
 684 rsource(char *name, struct stat *statp)
 685 {
 686         DIR *dirp;
 687         struct dirent *dp;
 688         char *last, *vect[1], path[1100];
 689
 690         if (!(dirp = opendir(name))) {
 691                 run_err("%s: %s", name, strerror(errno));
 692                 return;
 693         }
 694         last = strrchr(name, '/');
 695         if (last == 0)
 696                 last = name;
 697         else
 698                 last++;
 699         if (pflag) {
 700                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 701                     (u_long) statp->st_mtime,
 702                     (u_long) statp->st_atime);
 703                 (void) atomicio(vwrite, remout, path, strlen(path));
 704                 if (response() < 0) {
 705                         closedir(dirp);
 706                         return;
 707                 }
 708         }
 709         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 710             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 711         if (verbose_mode)
 712                 fprintf(stderr, "Entering directory: %s", path);
 713         (void) atomicio(vwrite, remout, path, strlen(path));
 714         if (response() < 0) {
 715                 closedir(dirp);
 716                 return;
 717         }
 718         while ((dp = readdir(dirp)) != NULL) {
 719                 if (dp->d_ino == 0)
 720                         continue;
 721                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 722                         continue;
 723                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 724                         run_err("%s/%s: name too long", name, dp->d_name);
 725                         continue;
 726                 }
 727                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 728                 vect[0] = path;
 729                 source(1, vect);
 730         }
 731         (void) closedir(dirp);
 732         (void) atomicio(vwrite, remout, "E\n", 2);
 733         (void) response();
 734 }
 735
 736 void
 737 bwlimit(int amount)
 738 {
 739         static struct timeval bwstart, bwend;
 740         static int lamt, thresh = 16384;
 741         u_int64_t waitlen;
 742         struct timespec ts, rm;
 743
 744         if (!timerisset(&bwstart)) {
 745                 gettimeofday(&bwstart, NULL);
 746                 return;
 747         }
 748
 749         lamt += amount;
 750         if (lamt < thresh)
 751                 return;
 752
 753         gettimeofday(&bwend, NULL);
 754         timersub(&bwend, &bwstart, &bwend);
 755         if (!timerisset(&bwend))
 756                 return;
 757
 758         lamt *= 8;
 759         waitlen = (double)1000000L * lamt / limit_rate;
 760
 761         bwstart.tv_sec = waitlen / 1000000L;
 762         bwstart.tv_usec = waitlen % 1000000L;
 763
 764         if (timercmp(&bwstart, &bwend, >)) {
 765                 timersub(&bwstart, &bwend, &bwend);
 766
 767                 /* Adjust the wait time */
 768                 if (bwend.tv_sec) {
 769                         thresh /= 2;
 770                         if (thresh < 2048)
 771                                 thresh = 2048;
 772                 } else if (bwend.tv_usec < 100) {
 773                         thresh *= 2;
 774                         if (thresh > 32768)
 775                                 thresh = 32768;
 776                 }
 777
 778                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 779                 while (nanosleep(&ts, &rm) == -1) {
 780                         if (errno != EINTR)
 781                                 break;
 782                         ts = rm;
 783                 }
 784         }
 785
 786         lamt = 0;
 787         gettimeofday(&bwstart, NULL);
 788 }
 789
 790 void
 791 sink(int argc, char **argv)
 792 {
 793         static BUF buffer;
 794         struct stat stb;
 795         enum {
 796                 YES, NO, DISPLAYED
 797         } wrerr;
 798         BUF *bp;
 799         off_t i;
 800         size_t j, count;
 801         int amt, exists, first, ofd;
 802         mode_t mode, omode, mask;
 803         off_t size, statbytes;
 804         int setimes, targisdir, wrerrno = 0;
 805         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 806         struct timeval tv[2];
 807
 808 #define atime   tv[0]
 809 #define mtime   tv[1]
 810 #define SCREWUP(str)    { why = str; goto screwup; }
 811
 812         setimes = targisdir = 0;
 813         mask = umask(0);
 814         if (!pflag)
 815                 (void) umask(mask);
 816         if (argc != 1) {
 817                 run_err("ambiguous target");
 818                 exit(1);
 819         }
 820         targ = *argv;
 821         if (targetshouldbedirectory)
 822                 verifydir(targ);
 823
 824         (void) atomicio(vwrite, remout, "", 1);
 825         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 826                 targisdir = 1;
 827         for (first = 1;; first = 0) {
 828                 cp = buf;
 829                 if (atomicio(read, remin, cp, 1) != 1)
 830                         return;
 831                 if (*cp++ == '\n')
 832                         SCREWUP("unexpected <newline>");
 833                 do {
 834                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 835                                 SCREWUP("lost connection");
 836                         *cp++ = ch;
 837                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 838                 *cp = 0;
 839                 if (verbose_mode)
 840                         fprintf(stderr, "Sink: %s", buf);
 841
 842                 if (buf[0] == '\01' || buf[0] == '\02') {
 843                         if (iamremote == 0)
 844                                 (void) atomicio(vwrite, STDERR_FILENO,
 845                                     buf + 1, strlen(buf + 1));
 846                         if (buf[0] == '\02')
 847                                 exit(1);
 848                         ++errs;
 849                         continue;
 850                 }
 851                 if (buf[0] == 'E') {
 852                         (void) atomicio(vwrite, remout, "", 1);
 853                         return;
 854                 }
 855                 if (ch == '\n')
 856                         *--cp = 0;
 857
 858                 cp = buf;
 859                 if (*cp == 'T') {
 860                         setimes++;
 861                         cp++;
 862                         mtime.tv_sec = strtol(cp, &cp, 10);
 863                         if (!cp || *cp++ != ' ')
 864                                 SCREWUP("mtime.sec not delimited");
 865                         mtime.tv_usec = strtol(cp, &cp, 10);
 866                         if (!cp || *cp++ != ' ')
 867                                 SCREWUP("mtime.usec not delimited");
 868                         atime.tv_sec = strtol(cp, &cp, 10);
 869                         if (!cp || *cp++ != ' ')
 870                                 SCREWUP("atime.sec not delimited");
 871                         atime.tv_usec = strtol(cp, &cp, 10);
 872                         if (!cp || *cp++ != '\0')
 873                                 SCREWUP("atime.usec not delimited");
 874                         (void) atomicio(vwrite, remout, "", 1);
 875                         continue;
 876                 }
 877                 if (*cp != 'C' && *cp != 'D') {
 878                         /*
 879                          * Check for the case "rcp remote:foo\* local:bar".
 880                          * In this case, the line "No match." can be returned
 881                          * by the shell before the rcp command on the remote is
 882                          * executed so the ^Aerror_message convention isn't
 883                          * followed.
 884                          */
 885                         if (first) {
 886                                 run_err("%s", cp);
 887                                 exit(1);
 888                         }
 889                         SCREWUP("expected control record");
 890                 }
 891                 mode = 0;
 892                 for (++cp; cp < buf + 5; cp++) {
 893                         if (*cp < '0' || *cp > '7')
 894                                 SCREWUP("bad mode");
 895                         mode = (mode << 3) | (*cp - '0');
 896                 }
 897                 if (*cp++ != ' ')
 898                         SCREWUP("mode not delimited");
 899
 900                 for (size = 0; isdigit(*cp);)
 901                         size = size * 10 + (*cp++ - '0');
 902                 if (*cp++ != ' ')
 903                         SCREWUP("size not delimited");
 904                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 905                         run_err("error: unexpected filename: %s", cp);
 906                         exit(1);
 907                 }
 908                 if (targisdir) {
 909                         static char *namebuf;
 910                         static size_t cursize;
 911                         size_t need;
 912
 913                         need = strlen(targ) + strlen(cp) + 250;
 914                         if (need > cursize) {
 915                                 if (namebuf)
 916                                         xfree(namebuf);
 917                                 namebuf = xmalloc(need);
 918                                 cursize = need;
 919                         }
 920                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 921                             strcmp(targ, "/") ? "/" : "", cp);
 922                         np = namebuf;
 923                 } else
 924                         np = targ;
 925                 curfile = cp;
 926                 exists = stat(np, &stb) == 0;
 927                 if (buf[0] == 'D') {
 928                         int mod_flag = pflag;
 929                         if (!iamrecursive)
 930                                 SCREWUP("received directory without -r");
 931                         if (exists) {
 932                                 if (!S_ISDIR(stb.st_mode)) {
 933                                         errno = ENOTDIR;
 934                                         goto bad;
 935                                 }
 936                                 if (pflag)
 937                                         (void) chmod(np, mode);
 938                         } else {
 939                                 /* Handle copying from a read-only
 940                                    directory */
 941                                 mod_flag = 1;
 942                                 if (mkdir(np, mode | S_IRWXU) < 0)
 943                                         goto bad;
 944                         }
 945                         vect[0] = xstrdup(np);
 946                         sink(1, vect);
 947                         if (setimes) {
 948                                 setimes = 0;
 949                                 if (utimes(vect[0], tv) < 0)
 950                                         run_err("%s: set times: %s",
 951                                             vect[0], strerror(errno));
 952                         }
 953                         if (mod_flag)
 954                                 (void) chmod(vect[0], mode);
 955                         if (vect[0])
 956                                 xfree(vect[0]);
 957                         continue;
 958                 }
 959                 omode = mode;
 960                 mode |= S_IWRITE;
 961                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 962 bad:                    run_err("%s: %s", np, strerror(errno));
 963                         continue;
 964                 }
 965                 (void) atomicio(vwrite, remout, "", 1);
 966                 if ((bp = allocbuf(&buffer, ofd, 4096)) == NULL) {
 967                         (void) close(ofd);
 968                         continue;
 969                 }
 970                 cp = bp->buf;
 971                 wrerr = NO;
 972
 973                 statbytes = 0;
 974                 if (showprogress)
 975                         start_progress_meter(curfile, size, &statbytes);
 976                 for (count = i = 0; i < size; i += 4096) {
 977                         amt = 4096;
 978                         if (i + amt > size)
 979                                 amt = size - i;
 980                         count += amt;
 981                         do {
 982                                 j = atomicio(read, remin, cp, amt);
 983                                 if (j == 0) {
 984                                         run_err("%s", j ? strerror(errno) :
 985                                             "dropped connection");
 986                                         exit(1);
 987                                 }
 988                                 amt -= j;
 989                                 cp += j;
 990                                 statbytes += j;
 991                         } while (amt > 0);
 992
 993                         if (limit_rate)
 994                                 bwlimit(4096);
 995
 996                         if (count == bp->cnt) {
 997                                 /* Keep reading so we stay sync'd up. */
 998                                 if (wrerr == NO) {
 999                                         if (atomicio(vwrite, ofd, bp->buf,
1000                                             count) != count) {
1001                                                 wrerr = YES;
1002                                                 wrerrno = errno;
1003                                         }
1004                                 }
1005                                 count = 0;
1006                                 cp = bp->buf;
1007                         }
1008                 }
1009                 if (showprogress)
1010                         stop_progress_meter();
1011                 if (count != 0 && wrerr == NO &&
1012                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1013                         wrerr = YES;
1014                         wrerrno = errno;
1015                 }
1016                 if (wrerr == NO && ftruncate(ofd, size) != 0) {
1017                         run_err("%s: truncate: %s", np, strerror(errno));
1018                         wrerr = DISPLAYED;
1019                 }
1020                 if (pflag) {
1021                         if (exists || omode != mode)
1022 #ifdef HAVE_FCHMOD
1023                                 if (fchmod(ofd, omode)) {
1024 #else /* HAVE_FCHMOD */
1025                                 if (chmod(np, omode)) {
1026 #endif /* HAVE_FCHMOD */
1027                                         run_err("%s: set mode: %s",
1028                                             np, strerror(errno));
1029                                         wrerr = DISPLAYED;
1030                                 }
1031                 } else {
1032                         if (!exists && omode != mode)
1033 #ifdef HAVE_FCHMOD
1034                                 if (fchmod(ofd, omode & ~mask)) {
1035 #else /* HAVE_FCHMOD */
1036                                 if (chmod(np, omode & ~mask)) {
1037 #endif /* HAVE_FCHMOD */
1038                                         run_err("%s: set mode: %s",
1039                                             np, strerror(errno));
1040                                         wrerr = DISPLAYED;
1041                                 }
1042                 }
1043                 if (close(ofd) == -1) {
1044                         wrerr = YES;
1045                         wrerrno = errno;
1046                 }
1047                 (void) response();
1048                 if (setimes && wrerr == NO) {
1049                         setimes = 0;
1050                         if (utimes(np, tv) < 0) {
1051                                 run_err("%s: set times: %s",
1052                                     np, strerror(errno));
1053                                 wrerr = DISPLAYED;
1054                         }
1055                 }
1056                 switch (wrerr) {
1057                 case YES:
1058                         run_err("%s: %s", np, strerror(wrerrno));
1059                         break;
1060                 case NO:
1061                         (void) atomicio(vwrite, remout, "", 1);
1062                         break;
1063                 case DISPLAYED:
1064                         break;
1065                 }
1066         }
1067 screwup:
1068         run_err("protocol error: %s", why);
1069         exit(1);
1070 }
1071
1072 int
1073 response(void)
1074 {
1075         char ch, *cp, resp, rbuf[2048];
1076
1077         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1078                 lostconn(0);
1079
1080         cp = rbuf;
1081         switch (resp) {
1082         case 0:         /* ok */
1083                 return (0);
1084         default:
1085                 *cp++ = resp;
1086                 /* FALLTHROUGH */
1087         case 1:         /* error, followed by error msg */
1088         case 2:         /* fatal error, "" */
1089                 do {
1090                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1091                                 lostconn(0);
1092                         *cp++ = ch;
1093                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1094
1095                 if (!iamremote)
1096                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1097                 ++errs;
1098                 if (resp == 1)
1099                         return (-1);
1100                 exit(1);
1101         }
1102         /* NOTREACHED */
1103 }
1104
1105 void
1106 usage(void)
1107 {
1108         (void) fprintf(stderr,
1109             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1110             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1111             "           [[user@]host1:]file1 [...] [[user@]host2:]file2\n");
1112         exit(1);
1113 }
1114
1115 void
1116 run_err(const char *fmt,...)
1117 {
1118         static FILE *fp;
1119         va_list ap;
1120
1121         ++errs;
1122         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1123                 (void) fprintf(fp, "%c", 0x01);
1124                 (void) fprintf(fp, "scp: ");
1125                 va_start(ap, fmt);
1126                 (void) vfprintf(fp, fmt, ap);
1127                 va_end(ap);
1128                 (void) fprintf(fp, "\n");
1129                 (void) fflush(fp);
1130         }
1131
1132         if (!iamremote) {
1133                 va_start(ap, fmt);
1134                 vfprintf(stderr, fmt, ap);
1135                 va_end(ap);
1136                 fprintf(stderr, "\n");
1137         }
1138 }
1139
1140 void
1141 verifydir(char *cp)
1142 {
1143         struct stat stb;
1144
1145         if (!stat(cp, &stb)) {
1146                 if (S_ISDIR(stb.st_mode))
1147                         return;
1148                 errno = ENOTDIR;
1149         }
1150         run_err("%s: %s", cp, strerror(errno));
1151         killchild(0);
1152 }
1153
1154 int
1155 okname(char *cp0)
1156 {
1157         int c;
1158         char *cp;
1159
1160         cp = cp0;
1161         do {
1162                 c = (int)*cp;
1163                 if (c & 0200)
1164                         goto bad;
1165                 if (!isalpha(c) && !isdigit(c)) {
1166                         switch (c) {
1167                         case '\'':
1168                         case '"':
1169                         case '`':
1170                         case ' ':
1171                         case '#':
1172                                 goto bad;
1173                         default:
1174                                 break;
1175                         }
1176                 }
1177         } while (*++cp);
1178         return (1);
1179
1180 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1181         return (0);
1182 }
1183
1184 BUF *
1185 allocbuf(BUF *bp, int fd, int blksize)
1186 {
1187         size_t size;
1188 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1189         struct stat stb;
1190
1191         if (fstat(fd, &stb) < 0) {
1192                 run_err("fstat: %s", strerror(errno));
1193                 return (0);
1194         }
1195         size = roundup(stb.st_blksize, blksize);
1196         if (size == 0)
1197                 size = blksize;
1198 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1199         size = blksize;
1200 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1201         if (bp->cnt >= size)
1202                 return (bp);
1203         if (bp->buf == NULL)
1204                 bp->buf = xmalloc(size);
1205         else
1206                 bp->buf = xrealloc(bp->buf, 1, size);
1207         memset(bp->buf, 0, size);
1208         bp->cnt = size;
1209         return (bp);
1210 }
1211
1212 void
1213 lostconn(int signo)
1214 {
1215         if (!iamremote)
1216                 write(STDERR_FILENO, "lost connection\n", 16);
1217         if (signo)
1218                 _exit(1);
1219         else
1220                 exit(1);
1221 }