crypto/openssh-5/scp.c

   1 /* $OpenBSD: scp.c,v 1.162 2008/01/01 09:06:39 dtucker Exp $ */
   2 /*
   3  * scp - secure remote copy.  This is basically patched BSD rcp which
   4  * uses ssh to do the data transfer (instead of using rcmd).
   5  *
   6  * NOTE: This version should NOT be suid root.  (This uses ssh to
   7  * do the transfer and ssh has the necessary privileges.)
   8  *
   9  * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
  10  *
  11  * As far as I am concerned, the code I have written for this software
  12  * can be used freely for any purpose.  Any derived versions of this
  13  * software must be clearly marked as such, and if the derived work is
  14  * incompatible with the protocol description in the RFC file, it must be
  15  * called by a name other than "ssh" or "Secure Shell".
  16  */
  17 /*
  18  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  19  * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  * 1. Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in the
  28  *    documentation and/or other materials provided with the distribution.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  33  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  39  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 /*
  43  * Parts from:
  44  *
  45  * Copyright (c) 1983, 1990, 1992, 1993, 1995
  46  *      The Regents of the University of California.  All rights reserved.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice, this list of conditions and the following disclaimer.
  53  * 2. Redistributions in binary form must reproduce the above copyright
  54  *    notice, this list of conditions and the following disclaimer in the
  55  *    documentation and/or other materials provided with the distribution.
  56  * 3. Neither the name of the University nor the names of its contributors
  57  *    may be used to endorse or promote products derived from this software
  58  *    without specific prior written permission.
  59  *
  60  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  61  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  63  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  64  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  65  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  66  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  67  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  68  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  69  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  70  * SUCH DAMAGE.
  71  *
  72  */
  73
  74 #include "includes.h"
  75
  76 #include <sys/types.h>
  77 #include <sys/param.h>
  78 #ifdef HAVE_SYS_STAT_H
  79 # include <sys/stat.h>
  80 #endif
  81 #ifdef HAVE_POLL_H
  82 #include <poll.h>
  83 #else
  84 # ifdef HAVE_SYS_POLL_H
  85 #  include <sys/poll.h>
  86 # endif
  87 #endif
  88 #ifdef HAVE_SYS_TIME_H
  89 # include <sys/time.h>
  90 #endif
  91 #include <sys/wait.h>
  92 #include <sys/uio.h>
  93
  94 #include <ctype.h>
  95 #include <dirent.h>
  96 #include <errno.h>
  97 #include <fcntl.h>
  98 #include <pwd.h>
  99 #include <signal.h>
 100 #include <stdarg.h>
 101 #include <stdio.h>
 102 #include <stdlib.h>
 103 #include <string.h>
 104 #include <time.h>
 105 #include <unistd.h>
 106 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H)
 107 #include <vis.h>
 108 #endif
 109
 110 #include "xmalloc.h"
 111 #include "atomicio.h"
 112 #include "pathnames.h"
 113 #include "log.h"
 114 #include "misc.h"
 115 #include "progressmeter.h"
 116
 117 extern char *__progname;
 118
 119 #define COPY_BUFLEN     16384
 120
 121 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 122
 123 void bwlimit(int);
 124
 125 /* Struct for addargs */
 126 arglist args;
 127
 128 /* Bandwidth limit */
 129 off_t limit_rate = 0;
 130
 131 /* Name of current file being transferred. */
 132 char *curfile;
 133
 134 /* This is set to non-zero to enable verbose mode. */
 135 int verbose_mode = 0;
 136
 137 /* This is set to zero if the progressmeter is not desired. */
 138 int showprogress = 1;
 139
 140 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 141 char *ssh_program = _PATH_SSH_PROGRAM;
 142
 143 /* This is used to store the pid of ssh_program */
 144 pid_t do_cmd_pid = -1;
 145
 146 static void
 147 killchild(int signo)
 148 {
 149         if (do_cmd_pid > 1) {
 150                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 151                 waitpid(do_cmd_pid, NULL, 0);
 152         }
 153
 154         if (signo)
 155                 _exit(1);
 156         exit(1);
 157 }
 158
 159 static int
 160 do_local_cmd(arglist *a)
 161 {
 162         u_int i;
 163         int status;
 164         pid_t pid;
 165
 166         if (a->num == 0)
 167                 fatal("do_local_cmd: no arguments");
 168
 169         if (verbose_mode) {
 170                 fprintf(stderr, "Executing:");
 171                 for (i = 0; i < a->num; i++)
 172                         fprintf(stderr, " %s", a->list[i]);
 173                 fprintf(stderr, "\n");
 174         }
 175         if ((pid = fork()) == -1)
 176                 fatal("do_local_cmd: fork: %s", strerror(errno));
 177
 178         if (pid == 0) {
 179                 execvp(a->list[0], a->list);
 180                 perror(a->list[0]);
 181                 exit(1);
 182         }
 183
 184         do_cmd_pid = pid;
 185         signal(SIGTERM, killchild);
 186         signal(SIGINT, killchild);
 187         signal(SIGHUP, killchild);
 188
 189         while (waitpid(pid, &status, 0) == -1)
 190                 if (errno != EINTR)
 191                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 192
 193         do_cmd_pid = -1;
 194
 195         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 196                 return (-1);
 197
 198         return (0);
 199 }
 200
 201 /*
 202  * This function executes the given command as the specified user on the
 203  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 204  * assigns the input and output file descriptors on success.
 205  */
 206
 207 int
 208 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 209 {
 210         int pin[2], pout[2], reserved[2];
 211
 212         if (verbose_mode)
 213                 fprintf(stderr,
 214                     "Executing: program %s host %s, user %s, command %s\n",
 215                     ssh_program, host,
 216                     remuser ? remuser : "(unspecified)", cmd);
 217
 218         /*
 219          * Reserve two descriptors so that the real pipes won't get
 220          * descriptors 0 and 1 because that will screw up dup2 below.
 221          */
 222         if (pipe(reserved) < 0)
 223                 fatal("pipe: %s", strerror(errno));
 224
 225         /* Create a socket pair for communicating with ssh. */
 226         if (pipe(pin) < 0)
 227                 fatal("pipe: %s", strerror(errno));
 228         if (pipe(pout) < 0)
 229                 fatal("pipe: %s", strerror(errno));
 230
 231         /* Free the reserved descriptors. */
 232         close(reserved[0]);
 233         close(reserved[1]);
 234
 235         /* Fork a child to execute the command on the remote host using ssh. */
 236         do_cmd_pid = fork();
 237         if (do_cmd_pid == 0) {
 238                 /* Child. */
 239                 close(pin[1]);
 240                 close(pout[0]);
 241                 dup2(pin[0], 0);
 242                 dup2(pout[1], 1);
 243                 close(pin[0]);
 244                 close(pout[1]);
 245
 246                 replacearg(&args, 0, "%s", ssh_program);
 247                 if (remuser != NULL)
 248                         addargs(&args, "-l%s", remuser);
 249                 addargs(&args, "%s", host);
 250                 addargs(&args, "%s", cmd);
 251
 252                 execvp(ssh_program, args.list);
 253                 perror(ssh_program);
 254                 exit(1);
 255         } else if (do_cmd_pid == -1) {
 256                 fatal("fork: %s", strerror(errno));
 257         }
 258         /* Parent.  Close the other side, and return the local side. */
 259         close(pin[0]);
 260         *fdout = pin[1];
 261         close(pout[1]);
 262         *fdin = pout[0];
 263         signal(SIGTERM, killchild);
 264         signal(SIGINT, killchild);
 265         signal(SIGHUP, killchild);
 266         return 0;
 267 }
 268
 269 typedef struct {
 270         size_t cnt;
 271         char *buf;
 272 } BUF;
 273
 274 BUF *allocbuf(BUF *, int, int);
 275 void lostconn(int);
 276 int okname(char *);
 277 void run_err(const char *,...);
 278 void verifydir(char *);
 279
 280 struct passwd *pwd;
 281 uid_t userid;
 282 int errs, remin, remout;
 283 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 284
 285 #define CMDNEEDS        64
 286 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 287
 288 int response(void);
 289 void rsource(char *, struct stat *);
 290 void sink(int, char *[]);
 291 void source(int, char *[]);
 292 void tolocal(int, char *[]);
 293 void toremote(char *, int, char *[]);
 294 size_t scpio(ssize_t (*)(int, void *, size_t), int, void *, size_t, off_t *);
 295 void usage(void);
 296
 297 int
 298 main(int argc, char **argv)
 299 {
 300         int ch, fflag, tflag, status, n;
 301         double speed;
 302         char *targ, *endp, **newargv;
 303         extern char *optarg;
 304         extern int optind;
 305
 306         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 307         sanitise_stdfd();
 308
 309         /* Copy argv, because we modify it */
 310         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 311         for (n = 0; n < argc; n++)
 312                 newargv[n] = xstrdup(argv[n]);
 313         argv = newargv;
 314
 315         __progname = ssh_get_progname(argv[0]);
 316
 317         memset(&args, '\0', sizeof(args));
 318         args.list = NULL;
 319         addargs(&args, "%s", ssh_program);
 320         addargs(&args, "-x");
 321         addargs(&args, "-oForwardAgent no");
 322         addargs(&args, "-oPermitLocalCommand no");
 323         addargs(&args, "-oClearAllForwardings yes");
 324
 325         fflag = tflag = 0;
 326         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 327                 switch (ch) {
 328                 /* User-visible flags. */
 329                 case '1':
 330                 case '2':
 331                 case '4':
 332                 case '6':
 333                 case 'C':
 334                         addargs(&args, "-%c", ch);
 335                         break;
 336                 case 'o':
 337                 case 'c':
 338                 case 'i':
 339                 case 'F':
 340                         addargs(&args, "-%c%s", ch, optarg);
 341                         break;
 342                 case 'P':
 343                         addargs(&args, "-p%s", optarg);
 344                         break;
 345                 case 'B':
 346                         addargs(&args, "-oBatchmode yes");
 347                         break;
 348                 case 'l':
 349                         speed = strtod(optarg, &endp);
 350                         if (speed <= 0 || *endp != '\0')
 351                                 usage();
 352                         limit_rate = speed * 1024;
 353                         break;
 354                 case 'p':
 355                         pflag = 1;
 356                         break;
 357                 case 'r':
 358                         iamrecursive = 1;
 359                         break;
 360                 case 'S':
 361                         ssh_program = xstrdup(optarg);
 362                         break;
 363                 case 'v':
 364                         addargs(&args, "-v");
 365                         verbose_mode = 1;
 366                         break;
 367                 case 'q':
 368                         addargs(&args, "-q");
 369                         showprogress = 0;
 370                         break;
 371
 372                 /* Server options. */
 373                 case 'd':
 374                         targetshouldbedirectory = 1;
 375                         break;
 376                 case 'f':       /* "from" */
 377                         iamremote = 1;
 378                         fflag = 1;
 379                         break;
 380                 case 't':       /* "to" */
 381                         iamremote = 1;
 382                         tflag = 1;
 383 #ifdef HAVE_CYGWIN
 384                         setmode(0, O_BINARY);
 385 #endif
 386                         break;
 387                 default:
 388                         usage();
 389                 }
 390         argc -= optind;
 391         argv += optind;
 392
 393         if ((pwd = getpwuid(userid = getuid())) == NULL)
 394                 fatal("unknown user %u", (u_int) userid);
 395
 396         if (!isatty(STDOUT_FILENO))
 397                 showprogress = 0;
 398
 399         remin = STDIN_FILENO;
 400         remout = STDOUT_FILENO;
 401
 402         if (fflag) {
 403                 /* Follow "protocol", send data. */
 404                 (void) response();
 405                 source(argc, argv);
 406                 exit(errs != 0);
 407         }
 408         if (tflag) {
 409                 /* Receive data. */
 410                 sink(argc, argv);
 411                 exit(errs != 0);
 412         }
 413         if (argc < 2)
 414                 usage();
 415         if (argc > 2)
 416                 targetshouldbedirectory = 1;
 417
 418         remin = remout = -1;
 419         do_cmd_pid = -1;
 420         /* Command to be executed on remote system using "ssh". */
 421         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 422             verbose_mode ? " -v" : "",
 423             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 424             targetshouldbedirectory ? " -d" : "");
 425
 426         (void) signal(SIGPIPE, lostconn);
 427
 428         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 429                 toremote(targ, argc, argv);
 430         else {
 431                 if (targetshouldbedirectory)
 432                         verifydir(argv[argc - 1]);
 433                 tolocal(argc, argv);    /* Dest is local host. */
 434         }
 435         /*
 436          * Finally check the exit status of the ssh process, if one was forked
 437          * and no error has occured yet
 438          */
 439         if (do_cmd_pid != -1 && errs == 0) {
 440                 if (remin != -1)
 441                     (void) close(remin);
 442                 if (remout != -1)
 443                     (void) close(remout);
 444                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 445                         errs = 1;
 446                 else {
 447                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 448                                 errs = 1;
 449                 }
 450         }
 451         exit(errs != 0);
 452 }
 453
 454 /*
 455  * atomicio-like wrapper that also applies bandwidth limits and updates
 456  * the progressmeter counter.
 457  */
 458 size_t
 459 scpio(ssize_t (*f)(int, void *, size_t), int fd, void *_p, size_t l, off_t *c)
 460 {
 461         u_char *p = (u_char *)_p;
 462         size_t offset;
 463         ssize_t r;
 464         struct pollfd pfd;
 465
 466         pfd.fd = fd;
 467         pfd.events = f == read ? POLLIN : POLLOUT;
 468         for (offset = 0; offset < l;) {
 469                 r = f(fd, p + offset, l - offset);
 470                 if (r == 0) {
 471                         errno = EPIPE;
 472                         return offset;
 473                 }
 474                 if (r < 0) {
 475                         if (errno == EINTR)
 476                                 continue;
 477                         if (errno == EAGAIN) {
 478                                 (void)poll(&pfd, 1, -1); /* Ignore errors */
 479                                 continue;
 480                         }
 481                         return offset;
 482                 }
 483                 offset += (size_t)r;
 484                 *c += (off_t)r;
 485                 if (limit_rate)
 486                         bwlimit(r);
 487         }
 488         return offset;
 489 }
 490
 491 void
 492 toremote(char *targ, int argc, char **argv)
 493 {
 494         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 495         arglist alist;
 496         int i;
 497
 498         memset(&alist, '\0', sizeof(alist));
 499         alist.list = NULL;
 500
 501         *targ++ = 0;
 502         if (*targ == 0)
 503                 targ = ".";
 504
 505         arg = xstrdup(argv[argc - 1]);
 506         if ((thost = strrchr(arg, '@'))) {
 507                 /* user@host */
 508                 *thost++ = 0;
 509                 tuser = arg;
 510                 if (*tuser == '\0')
 511                         tuser = NULL;
 512         } else {
 513                 thost = arg;
 514                 tuser = NULL;
 515         }
 516
 517         if (tuser != NULL && !okname(tuser)) {
 518                 xfree(arg);
 519                 return;
 520         }
 521
 522         for (i = 0; i < argc - 1; i++) {
 523                 src = colon(argv[i]);
 524                 if (src) {      /* remote to remote */
 525                         freeargs(&alist);
 526                         addargs(&alist, "%s", ssh_program);
 527                         if (verbose_mode)
 528                                 addargs(&alist, "-v");
 529                         addargs(&alist, "-x");
 530                         addargs(&alist, "-oClearAllForwardings yes");
 531                         addargs(&alist, "-n");
 532
 533                         *src++ = 0;
 534                         if (*src == 0)
 535                                 src = ".";
 536                         host = strrchr(argv[i], '@');
 537
 538                         if (host) {
 539                                 *host++ = 0;
 540                                 host = cleanhostname(host);
 541                                 suser = argv[i];
 542                                 if (*suser == '\0')
 543                                         suser = pwd->pw_name;
 544                                 else if (!okname(suser))
 545                                         continue;
 546                                 addargs(&alist, "-l");
 547                                 addargs(&alist, "%s", suser);
 548                         } else {
 549                                 host = cleanhostname(argv[i]);
 550                         }
 551                         addargs(&alist, "%s", host);
 552                         addargs(&alist, "%s", cmd);
 553                         addargs(&alist, "%s", src);
 554                         addargs(&alist, "%s%s%s:%s",
 555                             tuser ? tuser : "", tuser ? "@" : "",
 556                             thost, targ);
 557                         if (do_local_cmd(&alist) != 0)
 558                                 errs = 1;
 559                 } else {        /* local to remote */
 560                         if (remin == -1) {
 561                                 xasprintf(&bp, "%s -t %s", cmd, targ);
 562                                 host = cleanhostname(thost);
 563                                 if (do_cmd(host, tuser, bp, &remin,
 564                                     &remout) < 0)
 565                                         exit(1);
 566                                 if (response() < 0)
 567                                         exit(1);
 568                                 (void) xfree(bp);
 569                         }
 570                         source(1, argv + i);
 571                 }
 572         }
 573         xfree(arg);
 574 }
 575
 576 void
 577 tolocal(int argc, char **argv)
 578 {
 579         char *bp, *host, *src, *suser;
 580         arglist alist;
 581         int i;
 582
 583         memset(&alist, '\0', sizeof(alist));
 584         alist.list = NULL;
 585
 586         for (i = 0; i < argc - 1; i++) {
 587                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 588                         freeargs(&alist);
 589                         addargs(&alist, "%s", _PATH_CP);
 590                         if (iamrecursive)
 591                                 addargs(&alist, "-r");
 592                         if (pflag)
 593                                 addargs(&alist, "-p");
 594                         addargs(&alist, "%s", argv[i]);
 595                         addargs(&alist, "%s", argv[argc-1]);
 596                         if (do_local_cmd(&alist))
 597                                 ++errs;
 598                         continue;
 599                 }
 600                 *src++ = 0;
 601                 if (*src == 0)
 602                         src = ".";
 603                 if ((host = strrchr(argv[i], '@')) == NULL) {
 604                         host = argv[i];
 605                         suser = NULL;
 606                 } else {
 607                         *host++ = 0;
 608                         suser = argv[i];
 609                         if (*suser == '\0')
 610                                 suser = pwd->pw_name;
 611                 }
 612                 host = cleanhostname(host);
 613                 xasprintf(&bp, "%s -f %s", cmd, src);
 614                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 615                         (void) xfree(bp);
 616                         ++errs;
 617                         continue;
 618                 }
 619                 xfree(bp);
 620                 sink(1, argv + argc - 1);
 621                 (void) close(remin);
 622                 remin = remout = -1;
 623         }
 624 }
 625
 626 void
 627 source(int argc, char **argv)
 628 {
 629         struct stat stb;
 630         static BUF buffer;
 631         BUF *bp;
 632         off_t i, amt, statbytes;
 633         int fd = -1, haderr, indx;
 634         char *last, *name, buf[2048], encname[MAXPATHLEN];
 635         int len;
 636
 637         for (indx = 0; indx < argc; ++indx) {
 638                 name = argv[indx];
 639                 statbytes = 0;
 640                 len = strlen(name);
 641                 while (len > 1 && name[len-1] == '/')
 642                         name[--len] = '\0';
 643                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 644                         goto syserr;
 645                 if (strchr(name, '\n') != NULL) {
 646                         strnvis(encname, name, sizeof(encname), VIS_NL);
 647                         name = encname;
 648                 }
 649                 if (fstat(fd, &stb) < 0) {
 650 syserr:                 run_err("%s: %s", name, strerror(errno));
 651                         goto next;
 652                 }
 653                 unset_nonblock(fd);
 654                 switch (stb.st_mode & S_IFMT) {
 655                 case S_IFREG:
 656                         break;
 657                 case S_IFDIR:
 658                         if (iamrecursive) {
 659                                 rsource(name, &stb);
 660                                 goto next;
 661                         }
 662                         /* FALLTHROUGH */
 663                 default:
 664                         run_err("%s: not a regular file", name);
 665                         goto next;
 666                 }
 667                 if ((last = strrchr(name, '/')) == NULL)
 668                         last = name;
 669                 else
 670                         ++last;
 671                 curfile = last;
 672                 if (pflag) {
 673                         /*
 674                          * Make it compatible with possible future
 675                          * versions expecting microseconds.
 676                          */
 677                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 678                             (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime),
 679                             (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime));
 680                         if (verbose_mode) {
 681                                 fprintf(stderr, "File mtime %ld atime %ld\n",
 682                                     (long)stb.st_mtime, (long)stb.st_atime);
 683                                 fprintf(stderr, "Sending file timestamps: %s",
 684                                     buf);
 685                         }
 686                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 687                         if (response() < 0)
 688                                 goto next;
 689                 }
 690 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 691                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 692                     (u_int) (stb.st_mode & FILEMODEMASK),
 693                     (long long)stb.st_size, last);
 694                 if (verbose_mode) {
 695                         fprintf(stderr, "Sending file modes: %s", buf);
 696                 }
 697                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 698                 if (response() < 0)
 699                         goto next;
 700                 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
 701 next:                   if (fd != -1) {
 702                                 (void) close(fd);
 703                                 fd = -1;
 704                         }
 705                         continue;
 706                 }
 707                 if (showprogress)
 708                         start_progress_meter(curfile, stb.st_size, &statbytes);
 709                 set_nonblock(remout);
 710                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 711                         amt = bp->cnt;
 712                         if (i + amt > stb.st_size)
 713                                 amt = stb.st_size - i;
 714                         if (!haderr) {
 715                                 if (atomicio(read, fd, bp->buf, amt) != amt)
 716                                         haderr = errno;
 717                         }
 718                         /* Keep writing after error to retain sync */
 719                         if (haderr) {
 720                                 (void)atomicio(vwrite, remout, bp->buf, amt);
 721                                 continue;
 722                         }
 723                         if (scpio(vwrite, remout, bp->buf, amt,
 724                             &statbytes) != amt)
 725                                 haderr = errno;
 726                 }
 727                 unset_nonblock(remout);
 728                 if (showprogress)
 729                         stop_progress_meter();
 730
 731                 if (fd != -1) {
 732                         if (close(fd) < 0 && !haderr)
 733                                 haderr = errno;
 734                         fd = -1;
 735                 }
 736                 if (!haderr)
 737                         (void) atomicio(vwrite, remout, "", 1);
 738                 else
 739                         run_err("%s: %s", name, strerror(haderr));
 740                 (void) response();
 741         }
 742 }
 743
 744 void
 745 rsource(char *name, struct stat *statp)
 746 {
 747         DIR *dirp;
 748         struct dirent *dp;
 749         char *last, *vect[1], path[1100];
 750
 751         if (!(dirp = opendir(name))) {
 752                 run_err("%s: %s", name, strerror(errno));
 753                 return;
 754         }
 755         last = strrchr(name, '/');
 756         if (last == 0)
 757                 last = name;
 758         else
 759                 last++;
 760         if (pflag) {
 761                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 762                     (u_long) statp->st_mtime,
 763                     (u_long) statp->st_atime);
 764                 (void) atomicio(vwrite, remout, path, strlen(path));
 765                 if (response() < 0) {
 766                         closedir(dirp);
 767                         return;
 768                 }
 769         }
 770         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 771             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 772         if (verbose_mode)
 773                 fprintf(stderr, "Entering directory: %s", path);
 774         (void) atomicio(vwrite, remout, path, strlen(path));
 775         if (response() < 0) {
 776                 closedir(dirp);
 777                 return;
 778         }
 779         while ((dp = readdir(dirp)) != NULL) {
 780                 if (dp->d_ino == 0)
 781                         continue;
 782                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 783                         continue;
 784                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 785                         run_err("%s/%s: name too long", name, dp->d_name);
 786                         continue;
 787                 }
 788                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 789                 vect[0] = path;
 790                 source(1, vect);
 791         }
 792         (void) closedir(dirp);
 793         (void) atomicio(vwrite, remout, "E\n", 2);
 794         (void) response();
 795 }
 796
 797 void
 798 bwlimit(int amount)
 799 {
 800         static struct timeval bwstart, bwend;
 801         static int lamt, thresh = 16384;
 802         u_int64_t waitlen;
 803         struct timespec ts, rm;
 804
 805         if (!timerisset(&bwstart)) {
 806                 gettimeofday(&bwstart, NULL);
 807                 return;
 808         }
 809
 810         lamt += amount;
 811         if (lamt < thresh)
 812                 return;
 813
 814         gettimeofday(&bwend, NULL);
 815         timersub(&bwend, &bwstart, &bwend);
 816         if (!timerisset(&bwend))
 817                 return;
 818
 819         lamt *= 8;
 820         waitlen = (double)1000000L * lamt / limit_rate;
 821
 822         bwstart.tv_sec = waitlen / 1000000L;
 823         bwstart.tv_usec = waitlen % 1000000L;
 824
 825         if (timercmp(&bwstart, &bwend, >)) {
 826                 timersub(&bwstart, &bwend, &bwend);
 827
 828                 /* Adjust the wait time */
 829                 if (bwend.tv_sec) {
 830                         thresh /= 2;
 831                         if (thresh < 2048)
 832                                 thresh = 2048;
 833                 } else if (bwend.tv_usec < 10000) {
 834                         thresh *= 2;
 835                         if (thresh > COPY_BUFLEN * 4)
 836                                 thresh = COPY_BUFLEN * 4;
 837                 }
 838
 839                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 840                 while (nanosleep(&ts, &rm) == -1) {
 841                         if (errno != EINTR)
 842                                 break;
 843                         ts = rm;
 844                 }
 845         }
 846
 847         lamt = 0;
 848         gettimeofday(&bwstart, NULL);
 849 }
 850
 851 void
 852 sink(int argc, char **argv)
 853 {
 854         static BUF buffer;
 855         struct stat stb;
 856         enum {
 857                 YES, NO, DISPLAYED
 858         } wrerr;
 859         BUF *bp;
 860         off_t i;
 861         size_t j, count;
 862         int amt, exists, first, ofd;
 863         mode_t mode, omode, mask;
 864         off_t size, statbytes;
 865         int setimes, targisdir, wrerrno = 0;
 866         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 867         struct timeval tv[2];
 868
 869 #define atime   tv[0]
 870 #define mtime   tv[1]
 871 #define SCREWUP(str)    { why = str; goto screwup; }
 872
 873         setimes = targisdir = 0;
 874         mask = umask(0);
 875         if (!pflag)
 876                 (void) umask(mask);
 877         if (argc != 1) {
 878                 run_err("ambiguous target");
 879                 exit(1);
 880         }
 881         targ = *argv;
 882         if (targetshouldbedirectory)
 883                 verifydir(targ);
 884
 885         (void) atomicio(vwrite, remout, "", 1);
 886         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 887                 targisdir = 1;
 888         for (first = 1;; first = 0) {
 889                 cp = buf;
 890                 if (atomicio(read, remin, cp, 1) != 1)
 891                         return;
 892                 if (*cp++ == '\n')
 893                         SCREWUP("unexpected <newline>");
 894                 do {
 895                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 896                                 SCREWUP("lost connection");
 897                         *cp++ = ch;
 898                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 899                 *cp = 0;
 900                 if (verbose_mode)
 901                         fprintf(stderr, "Sink: %s", buf);
 902
 903                 if (buf[0] == '\01' || buf[0] == '\02') {
 904                         if (iamremote == 0)
 905                                 (void) atomicio(vwrite, STDERR_FILENO,
 906                                     buf + 1, strlen(buf + 1));
 907                         if (buf[0] == '\02')
 908                                 exit(1);
 909                         ++errs;
 910                         continue;
 911                 }
 912                 if (buf[0] == 'E') {
 913                         (void) atomicio(vwrite, remout, "", 1);
 914                         return;
 915                 }
 916                 if (ch == '\n')
 917                         *--cp = 0;
 918
 919                 cp = buf;
 920                 if (*cp == 'T') {
 921                         setimes++;
 922                         cp++;
 923                         mtime.tv_sec = strtol(cp, &cp, 10);
 924                         if (!cp || *cp++ != ' ')
 925                                 SCREWUP("mtime.sec not delimited");
 926                         mtime.tv_usec = strtol(cp, &cp, 10);
 927                         if (!cp || *cp++ != ' ')
 928                                 SCREWUP("mtime.usec not delimited");
 929                         atime.tv_sec = strtol(cp, &cp, 10);
 930                         if (!cp || *cp++ != ' ')
 931                                 SCREWUP("atime.sec not delimited");
 932                         atime.tv_usec = strtol(cp, &cp, 10);
 933                         if (!cp || *cp++ != '\0')
 934                                 SCREWUP("atime.usec not delimited");
 935                         (void) atomicio(vwrite, remout, "", 1);
 936                         continue;
 937                 }
 938                 if (*cp != 'C' && *cp != 'D') {
 939                         /*
 940                          * Check for the case "rcp remote:foo\* local:bar".
 941                          * In this case, the line "No match." can be returned
 942                          * by the shell before the rcp command on the remote is
 943                          * executed so the ^Aerror_message convention isn't
 944                          * followed.
 945                          */
 946                         if (first) {
 947                                 run_err("%s", cp);
 948                                 exit(1);
 949                         }
 950                         SCREWUP("expected control record");
 951                 }
 952                 mode = 0;
 953                 for (++cp; cp < buf + 5; cp++) {
 954                         if (*cp < '0' || *cp > '7')
 955                                 SCREWUP("bad mode");
 956                         mode = (mode << 3) | (*cp - '0');
 957                 }
 958                 if (*cp++ != ' ')
 959                         SCREWUP("mode not delimited");
 960
 961                 for (size = 0; isdigit(*cp);)
 962                         size = size * 10 + (*cp++ - '0');
 963                 if (*cp++ != ' ')
 964                         SCREWUP("size not delimited");
 965                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 966                         run_err("error: unexpected filename: %s", cp);
 967                         exit(1);
 968                 }
 969                 if (targisdir) {
 970                         static char *namebuf;
 971                         static size_t cursize;
 972                         size_t need;
 973
 974                         need = strlen(targ) + strlen(cp) + 250;
 975                         if (need > cursize) {
 976                                 if (namebuf)
 977                                         xfree(namebuf);
 978                                 namebuf = xmalloc(need);
 979                                 cursize = need;
 980                         }
 981                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 982                             strcmp(targ, "/") ? "/" : "", cp);
 983                         np = namebuf;
 984                 } else
 985                         np = targ;
 986                 curfile = cp;
 987                 exists = stat(np, &stb) == 0;
 988                 if (buf[0] == 'D') {
 989                         int mod_flag = pflag;
 990                         if (!iamrecursive)
 991                                 SCREWUP("received directory without -r");
 992                         if (exists) {
 993                                 if (!S_ISDIR(stb.st_mode)) {
 994                                         errno = ENOTDIR;
 995                                         goto bad;
 996                                 }
 997                                 if (pflag)
 998                                         (void) chmod(np, mode);
 999                         } else {
1000                                 /* Handle copying from a read-only
1001                                    directory */
1002                                 mod_flag = 1;
1003                                 if (mkdir(np, mode | S_IRWXU) < 0)
1004                                         goto bad;
1005                         }
1006                         vect[0] = xstrdup(np);
1007                         sink(1, vect);
1008                         if (setimes) {
1009                                 setimes = 0;
1010                                 if (utimes(vect[0], tv) < 0)
1011                                         run_err("%s: set times: %s",
1012                                             vect[0], strerror(errno));
1013                         }
1014                         if (mod_flag)
1015                                 (void) chmod(vect[0], mode);
1016                         if (vect[0])
1017                                 xfree(vect[0]);
1018                         continue;
1019                 }
1020                 omode = mode;
1021                 mode |= S_IWRITE;
1022                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1023 bad:                    run_err("%s: %s", np, strerror(errno));
1024                         continue;
1025                 }
1026                 (void) atomicio(vwrite, remout, "", 1);
1027                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1028                         (void) close(ofd);
1029                         continue;
1030                 }
1031                 cp = bp->buf;
1032                 wrerr = NO;
1033
1034                 statbytes = 0;
1035                 if (showprogress)
1036                         start_progress_meter(curfile, size, &statbytes);
1037                 set_nonblock(remin);
1038                 for (count = i = 0; i < size; i += bp->cnt) {
1039                         amt = bp->cnt;
1040                         if (i + amt > size)
1041                                 amt = size - i;
1042                         count += amt;
1043                         do {
1044                                 j = scpio(read, remin, cp, amt, &statbytes);
1045                                 if (j == 0) {
1046                                         run_err("%s", j != EPIPE ?
1047                                             strerror(errno) :
1048                                             "dropped connection");
1049                                         exit(1);
1050                                 }
1051                                 amt -= j;
1052                                 cp += j;
1053                         } while (amt > 0);
1054
1055                         if (count == bp->cnt) {
1056                                 /* Keep reading so we stay sync'd up. */
1057                                 if (wrerr == NO) {
1058                                         if (atomicio(vwrite, ofd, bp->buf,
1059                                             count) != count) {
1060                                                 wrerr = YES;
1061                                                 wrerrno = errno;
1062                                         }
1063                                 }
1064                                 count = 0;
1065                                 cp = bp->buf;
1066                         }
1067                 }
1068                 unset_nonblock(remin);
1069                 if (showprogress)
1070                         stop_progress_meter();
1071                 if (count != 0 && wrerr == NO &&
1072                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1073                         wrerr = YES;
1074                         wrerrno = errno;
1075                 }
1076                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1077                     ftruncate(ofd, size) != 0) {
1078                         run_err("%s: truncate: %s", np, strerror(errno));
1079                         wrerr = DISPLAYED;
1080                 }
1081                 if (pflag) {
1082                         if (exists || omode != mode)
1083 #ifdef HAVE_FCHMOD
1084                                 if (fchmod(ofd, omode)) {
1085 #else /* HAVE_FCHMOD */
1086                                 if (chmod(np, omode)) {
1087 #endif /* HAVE_FCHMOD */
1088                                         run_err("%s: set mode: %s",
1089                                             np, strerror(errno));
1090                                         wrerr = DISPLAYED;
1091                                 }
1092                 } else {
1093                         if (!exists && omode != mode)
1094 #ifdef HAVE_FCHMOD
1095                                 if (fchmod(ofd, omode & ~mask)) {
1096 #else /* HAVE_FCHMOD */
1097                                 if (chmod(np, omode & ~mask)) {
1098 #endif /* HAVE_FCHMOD */
1099                                         run_err("%s: set mode: %s",
1100                                             np, strerror(errno));
1101                                         wrerr = DISPLAYED;
1102                                 }
1103                 }
1104                 if (close(ofd) == -1) {
1105                         wrerr = YES;
1106                         wrerrno = errno;
1107                 }
1108                 (void) response();
1109                 if (setimes && wrerr == NO) {
1110                         setimes = 0;
1111                         if (utimes(np, tv) < 0) {
1112                                 run_err("%s: set times: %s",
1113                                     np, strerror(errno));
1114                                 wrerr = DISPLAYED;
1115                         }
1116                 }
1117                 switch (wrerr) {
1118                 case YES:
1119                         run_err("%s: %s", np, strerror(wrerrno));
1120                         break;
1121                 case NO:
1122                         (void) atomicio(vwrite, remout, "", 1);
1123                         break;
1124                 case DISPLAYED:
1125                         break;
1126                 }
1127         }
1128 screwup:
1129         run_err("protocol error: %s", why);
1130         exit(1);
1131 }
1132
1133 int
1134 response(void)
1135 {
1136         char ch, *cp, resp, rbuf[2048];
1137
1138         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1139                 lostconn(0);
1140
1141         cp = rbuf;
1142         switch (resp) {
1143         case 0:         /* ok */
1144                 return (0);
1145         default:
1146                 *cp++ = resp;
1147                 /* FALLTHROUGH */
1148         case 1:         /* error, followed by error msg */
1149         case 2:         /* fatal error, "" */
1150                 do {
1151                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1152                                 lostconn(0);
1153                         *cp++ = ch;
1154                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1155
1156                 if (!iamremote)
1157                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1158                 ++errs;
1159                 if (resp == 1)
1160                         return (-1);
1161                 exit(1);
1162         }
1163         /* NOTREACHED */
1164 }
1165
1166 void
1167 usage(void)
1168 {
1169         (void) fprintf(stderr,
1170             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1171             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1172             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1173         exit(1);
1174 }
1175
1176 void
1177 run_err(const char *fmt,...)
1178 {
1179         static FILE *fp;
1180         va_list ap;
1181
1182         ++errs;
1183         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1184                 (void) fprintf(fp, "%c", 0x01);
1185                 (void) fprintf(fp, "scp: ");
1186                 va_start(ap, fmt);
1187                 (void) vfprintf(fp, fmt, ap);
1188                 va_end(ap);
1189                 (void) fprintf(fp, "\n");
1190                 (void) fflush(fp);
1191         }
1192
1193         if (!iamremote) {
1194                 va_start(ap, fmt);
1195                 vfprintf(stderr, fmt, ap);
1196                 va_end(ap);
1197                 fprintf(stderr, "\n");
1198         }
1199 }
1200
1201 void
1202 verifydir(char *cp)
1203 {
1204         struct stat stb;
1205
1206         if (!stat(cp, &stb)) {
1207                 if (S_ISDIR(stb.st_mode))
1208                         return;
1209                 errno = ENOTDIR;
1210         }
1211         run_err("%s: %s", cp, strerror(errno));
1212         killchild(0);
1213 }
1214
1215 int
1216 okname(char *cp0)
1217 {
1218         int c;
1219         char *cp;
1220
1221         cp = cp0;
1222         do {
1223                 c = (int)*cp;
1224                 if (c & 0200)
1225                         goto bad;
1226                 if (!isalpha(c) && !isdigit(c)) {
1227                         switch (c) {
1228                         case '\'':
1229                         case '"':
1230                         case '`':
1231                         case ' ':
1232                         case '#':
1233                                 goto bad;
1234                         default:
1235                                 break;
1236                         }
1237                 }
1238         } while (*++cp);
1239         return (1);
1240
1241 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1242         return (0);
1243 }
1244
1245 BUF *
1246 allocbuf(BUF *bp, int fd, int blksize)
1247 {
1248         size_t size;
1249 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1250         struct stat stb;
1251
1252         if (fstat(fd, &stb) < 0) {
1253                 run_err("fstat: %s", strerror(errno));
1254                 return (0);
1255         }
1256         size = roundup(stb.st_blksize, blksize);
1257         if (size == 0)
1258                 size = blksize;
1259 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1260         size = blksize;
1261 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1262         if (bp->cnt >= size)
1263                 return (bp);
1264         if (bp->buf == NULL)
1265                 bp->buf = xmalloc(size);
1266         else
1267                 bp->buf = xrealloc(bp->buf, 1, size);
1268         memset(bp->buf, 0, size);
1269         bp->cnt = size;
1270         return (bp);
1271 }
1272
1273 void
1274 lostconn(int signo)
1275 {
1276         if (!iamremote)
1277                 write(STDERR_FILENO, "lost connection\n", 16);
1278         if (signo)
1279                 _exit(1);
1280         else
1281                 exit(1);
1282 }