scp.c

   1 /* $OpenBSD: scp.c,v 1.165 2009/12/20 07:28:36 guenther 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");
 249                         addargs(&args, "%s", remuser);
 250                 }
 251                 addargs(&args, "--");
 252                 addargs(&args, "%s", host);
 253                 addargs(&args, "%s", cmd);
 254
 255                 execvp(ssh_program, args.list);
 256                 perror(ssh_program);
 257                 exit(1);
 258         } else if (do_cmd_pid == -1) {
 259                 fatal("fork: %s", strerror(errno));
 260         }
 261         /* Parent.  Close the other side, and return the local side. */
 262         close(pin[0]);
 263         *fdout = pin[1];
 264         close(pout[1]);
 265         *fdin = pout[0];
 266         signal(SIGTERM, killchild);
 267         signal(SIGINT, killchild);
 268         signal(SIGHUP, killchild);
 269         return 0;
 270 }
 271
 272 typedef struct {
 273         size_t cnt;
 274         char *buf;
 275 } BUF;
 276
 277 BUF *allocbuf(BUF *, int, int);
 278 void lostconn(int);
 279 int okname(char *);
 280 void run_err(const char *,...);
 281 void verifydir(char *);
 282
 283 struct passwd *pwd;
 284 uid_t userid;
 285 int errs, remin, remout;
 286 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 287
 288 #define CMDNEEDS        64
 289 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 290
 291 int response(void);
 292 void rsource(char *, struct stat *);
 293 void sink(int, char *[]);
 294 void source(int, char *[]);
 295 void tolocal(int, char *[]);
 296 void toremote(char *, int, char *[]);
 297 size_t scpio(ssize_t (*)(int, void *, size_t), int, void *, size_t, off_t *);
 298 void usage(void);
 299
 300 int
 301 main(int argc, char **argv)
 302 {
 303         int ch, fflag, tflag, status, n;
 304         double speed;
 305         char *targ, *endp, **newargv;
 306         extern char *optarg;
 307         extern int optind;
 308
 309         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 310         sanitise_stdfd();
 311
 312         /* Copy argv, because we modify it */
 313         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 314         for (n = 0; n < argc; n++)
 315                 newargv[n] = xstrdup(argv[n]);
 316         argv = newargv;
 317
 318         __progname = ssh_get_progname(argv[0]);
 319
 320         memset(&args, '\0', sizeof(args));
 321         args.list = NULL;
 322         addargs(&args, "%s", ssh_program);
 323         addargs(&args, "-x");
 324         addargs(&args, "-oForwardAgent no");
 325         addargs(&args, "-oPermitLocalCommand no");
 326         addargs(&args, "-oClearAllForwardings yes");
 327
 328         fflag = tflag = 0;
 329         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 330                 switch (ch) {
 331                 /* User-visible flags. */
 332                 case '1':
 333                 case '2':
 334                 case '4':
 335                 case '6':
 336                 case 'C':
 337                         addargs(&args, "-%c", ch);
 338                         break;
 339                 case 'o':
 340                 case 'c':
 341                 case 'i':
 342                 case 'F':
 343                         addargs(&args, "-%c", ch);
 344                         addargs(&args, "%s", optarg);
 345                         break;
 346                 case 'P':
 347                         addargs(&args, "-p");
 348                         addargs(&args, "%s", optarg);
 349                         break;
 350                 case 'B':
 351                         addargs(&args, "-oBatchmode yes");
 352                         break;
 353                 case 'l':
 354                         speed = strtod(optarg, &endp);
 355                         if (speed <= 0 || *endp != '\0')
 356                                 usage();
 357                         limit_rate = speed * 1024;
 358                         break;
 359                 case 'p':
 360                         pflag = 1;
 361                         break;
 362                 case 'r':
 363                         iamrecursive = 1;
 364                         break;
 365                 case 'S':
 366                         ssh_program = xstrdup(optarg);
 367                         break;
 368                 case 'v':
 369                         addargs(&args, "-v");
 370                         verbose_mode = 1;
 371                         break;
 372                 case 'q':
 373                         addargs(&args, "-q");
 374                         showprogress = 0;
 375                         break;
 376
 377                 /* Server options. */
 378                 case 'd':
 379                         targetshouldbedirectory = 1;
 380                         break;
 381                 case 'f':       /* "from" */
 382                         iamremote = 1;
 383                         fflag = 1;
 384                         break;
 385                 case 't':       /* "to" */
 386                         iamremote = 1;
 387                         tflag = 1;
 388 #ifdef HAVE_CYGWIN
 389                         setmode(0, O_BINARY);
 390 #endif
 391                         break;
 392                 default:
 393                         usage();
 394                 }
 395         argc -= optind;
 396         argv += optind;
 397
 398         if ((pwd = getpwuid(userid = getuid())) == NULL)
 399                 fatal("unknown user %u", (u_int) userid);
 400
 401         if (!isatty(STDOUT_FILENO))
 402                 showprogress = 0;
 403
 404         remin = STDIN_FILENO;
 405         remout = STDOUT_FILENO;
 406
 407         if (fflag) {
 408                 /* Follow "protocol", send data. */
 409                 (void) response();
 410                 source(argc, argv);
 411                 exit(errs != 0);
 412         }
 413         if (tflag) {
 414                 /* Receive data. */
 415                 sink(argc, argv);
 416                 exit(errs != 0);
 417         }
 418         if (argc < 2)
 419                 usage();
 420         if (argc > 2)
 421                 targetshouldbedirectory = 1;
 422
 423         remin = remout = -1;
 424         do_cmd_pid = -1;
 425         /* Command to be executed on remote system using "ssh". */
 426         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 427             verbose_mode ? " -v" : "",
 428             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 429             targetshouldbedirectory ? " -d" : "");
 430
 431         (void) signal(SIGPIPE, lostconn);
 432
 433         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 434                 toremote(targ, argc, argv);
 435         else {
 436                 if (targetshouldbedirectory)
 437                         verifydir(argv[argc - 1]);
 438                 tolocal(argc, argv);    /* Dest is local host. */
 439         }
 440         /*
 441          * Finally check the exit status of the ssh process, if one was forked
 442          * and no error has occurred yet
 443          */
 444         if (do_cmd_pid != -1 && errs == 0) {
 445                 if (remin != -1)
 446                     (void) close(remin);
 447                 if (remout != -1)
 448                     (void) close(remout);
 449                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 450                         errs = 1;
 451                 else {
 452                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 453                                 errs = 1;
 454                 }
 455         }
 456         exit(errs != 0);
 457 }
 458
 459 /*
 460  * atomicio-like wrapper that also applies bandwidth limits and updates
 461  * the progressmeter counter.
 462  */
 463 size_t
 464 scpio(ssize_t (*f)(int, void *, size_t), int fd, void *_p, size_t l, off_t *c)
 465 {
 466         u_char *p = (u_char *)_p;
 467         size_t offset;
 468         ssize_t r;
 469         struct pollfd pfd;
 470
 471         pfd.fd = fd;
 472         pfd.events = f == read ? POLLIN : POLLOUT;
 473         for (offset = 0; offset < l;) {
 474                 r = f(fd, p + offset, l - offset);
 475                 if (r == 0) {
 476                         errno = EPIPE;
 477                         return offset;
 478                 }
 479                 if (r < 0) {
 480                         if (errno == EINTR)
 481                                 continue;
 482                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 483                                 (void)poll(&pfd, 1, -1); /* Ignore errors */
 484                                 continue;
 485                         }
 486                         return offset;
 487                 }
 488                 offset += (size_t)r;
 489                 *c += (off_t)r;
 490                 if (limit_rate)
 491                         bwlimit(r);
 492         }
 493         return offset;
 494 }
 495
 496 void
 497 toremote(char *targ, int argc, char **argv)
 498 {
 499         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 500         arglist alist;
 501         int i;
 502
 503         memset(&alist, '\0', sizeof(alist));
 504         alist.list = NULL;
 505
 506         *targ++ = 0;
 507         if (*targ == 0)
 508                 targ = ".";
 509
 510         arg = xstrdup(argv[argc - 1]);
 511         if ((thost = strrchr(arg, '@'))) {
 512                 /* user@host */
 513                 *thost++ = 0;
 514                 tuser = arg;
 515                 if (*tuser == '\0')
 516                         tuser = NULL;
 517         } else {
 518                 thost = arg;
 519                 tuser = NULL;
 520         }
 521
 522         if (tuser != NULL && !okname(tuser)) {
 523                 xfree(arg);
 524                 return;
 525         }
 526
 527         for (i = 0; i < argc - 1; i++) {
 528                 src = colon(argv[i]);
 529                 if (src) {      /* remote to remote */
 530                         freeargs(&alist);
 531                         addargs(&alist, "%s", ssh_program);
 532                         if (verbose_mode)
 533                                 addargs(&alist, "-v");
 534                         addargs(&alist, "-x");
 535                         addargs(&alist, "-oClearAllForwardings yes");
 536                         addargs(&alist, "-n");
 537
 538                         *src++ = 0;
 539                         if (*src == 0)
 540                                 src = ".";
 541                         host = strrchr(argv[i], '@');
 542
 543                         if (host) {
 544                                 *host++ = 0;
 545                                 host = cleanhostname(host);
 546                                 suser = argv[i];
 547                                 if (*suser == '\0')
 548                                         suser = pwd->pw_name;
 549                                 else if (!okname(suser))
 550                                         continue;
 551                                 addargs(&alist, "-l");
 552                                 addargs(&alist, "%s", suser);
 553                         } else {
 554                                 host = cleanhostname(argv[i]);
 555                         }
 556                         addargs(&alist, "--");
 557                         addargs(&alist, "%s", host);
 558                         addargs(&alist, "%s", cmd);
 559                         addargs(&alist, "%s", src);
 560                         addargs(&alist, "%s%s%s:%s",
 561                             tuser ? tuser : "", tuser ? "@" : "",
 562                             thost, targ);
 563                         if (do_local_cmd(&alist) != 0)
 564                                 errs = 1;
 565                 } else {        /* local to remote */
 566                         if (remin == -1) {
 567                                 xasprintf(&bp, "%s -t -- %s", cmd, targ);
 568                                 host = cleanhostname(thost);
 569                                 if (do_cmd(host, tuser, bp, &remin,
 570                                     &remout) < 0)
 571                                         exit(1);
 572                                 if (response() < 0)
 573                                         exit(1);
 574                                 (void) xfree(bp);
 575                         }
 576                         source(1, argv + i);
 577                 }
 578         }
 579         xfree(arg);
 580 }
 581
 582 void
 583 tolocal(int argc, char **argv)
 584 {
 585         char *bp, *host, *src, *suser;
 586         arglist alist;
 587         int i;
 588
 589         memset(&alist, '\0', sizeof(alist));
 590         alist.list = NULL;
 591
 592         for (i = 0; i < argc - 1; i++) {
 593                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 594                         freeargs(&alist);
 595                         addargs(&alist, "%s", _PATH_CP);
 596                         if (iamrecursive)
 597                                 addargs(&alist, "-r");
 598                         if (pflag)
 599                                 addargs(&alist, "-p");
 600                         addargs(&alist, "--");
 601                         addargs(&alist, "%s", argv[i]);
 602                         addargs(&alist, "%s", argv[argc-1]);
 603                         if (do_local_cmd(&alist))
 604                                 ++errs;
 605                         continue;
 606                 }
 607                 *src++ = 0;
 608                 if (*src == 0)
 609                         src = ".";
 610                 if ((host = strrchr(argv[i], '@')) == NULL) {
 611                         host = argv[i];
 612                         suser = NULL;
 613                 } else {
 614                         *host++ = 0;
 615                         suser = argv[i];
 616                         if (*suser == '\0')
 617                                 suser = pwd->pw_name;
 618                 }
 619                 host = cleanhostname(host);
 620                 xasprintf(&bp, "%s -f -- %s", cmd, src);
 621                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 622                         (void) xfree(bp);
 623                         ++errs;
 624                         continue;
 625                 }
 626                 xfree(bp);
 627                 sink(1, argv + argc - 1);
 628                 (void) close(remin);
 629                 remin = remout = -1;
 630         }
 631 }
 632
 633 void
 634 source(int argc, char **argv)
 635 {
 636         struct stat stb;
 637         static BUF buffer;
 638         BUF *bp;
 639         off_t i, statbytes;
 640         size_t amt;
 641         int fd = -1, haderr, indx;
 642         char *last, *name, buf[2048], encname[MAXPATHLEN];
 643         int len;
 644
 645         for (indx = 0; indx < argc; ++indx) {
 646                 name = argv[indx];
 647                 statbytes = 0;
 648                 len = strlen(name);
 649                 while (len > 1 && name[len-1] == '/')
 650                         name[--len] = '\0';
 651                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 652                         goto syserr;
 653                 if (strchr(name, '\n') != NULL) {
 654                         strnvis(encname, name, sizeof(encname), VIS_NL);
 655                         name = encname;
 656                 }
 657                 if (fstat(fd, &stb) < 0) {
 658 syserr:                 run_err("%s: %s", name, strerror(errno));
 659                         goto next;
 660                 }
 661                 if (stb.st_size < 0) {
 662                         run_err("%s: %s", name, "Negative file size");
 663                         goto next;
 664                 }
 665                 unset_nonblock(fd);
 666                 switch (stb.st_mode & S_IFMT) {
 667                 case S_IFREG:
 668                         break;
 669                 case S_IFDIR:
 670                         if (iamrecursive) {
 671                                 rsource(name, &stb);
 672                                 goto next;
 673                         }
 674                         /* FALLTHROUGH */
 675                 default:
 676                         run_err("%s: not a regular file", name);
 677                         goto next;
 678                 }
 679                 if ((last = strrchr(name, '/')) == NULL)
 680                         last = name;
 681                 else
 682                         ++last;
 683                 curfile = last;
 684                 if (pflag) {
 685                         /*
 686                          * Make it compatible with possible future
 687                          * versions expecting microseconds.
 688                          */
 689                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 690                             (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime),
 691                             (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime));
 692                         if (verbose_mode) {
 693                                 fprintf(stderr, "File mtime %ld atime %ld\n",
 694                                     (long)stb.st_mtime, (long)stb.st_atime);
 695                                 fprintf(stderr, "Sending file timestamps: %s",
 696                                     buf);
 697                         }
 698                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 699                         if (response() < 0)
 700                                 goto next;
 701                 }
 702 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 703                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 704                     (u_int) (stb.st_mode & FILEMODEMASK),
 705                     (long long)stb.st_size, last);
 706                 if (verbose_mode) {
 707                         fprintf(stderr, "Sending file modes: %s", buf);
 708                 }
 709                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 710                 if (response() < 0)
 711                         goto next;
 712                 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
 713 next:                   if (fd != -1) {
 714                                 (void) close(fd);
 715                                 fd = -1;
 716                         }
 717                         continue;
 718                 }
 719                 if (showprogress)
 720                         start_progress_meter(curfile, stb.st_size, &statbytes);
 721                 set_nonblock(remout);
 722                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 723                         amt = bp->cnt;
 724                         if (i + (off_t)amt > stb.st_size)
 725                                 amt = stb.st_size - i;
 726                         if (!haderr) {
 727                                 if (atomicio(read, fd, bp->buf, amt) != amt)
 728                                         haderr = errno;
 729                         }
 730                         /* Keep writing after error to retain sync */
 731                         if (haderr) {
 732                                 (void)atomicio(vwrite, remout, bp->buf, amt);
 733                                 continue;
 734                         }
 735                         if (scpio(vwrite, remout, bp->buf, amt,
 736                             &statbytes) != amt)
 737                                 haderr = errno;
 738                 }
 739                 unset_nonblock(remout);
 740                 if (showprogress)
 741                         stop_progress_meter();
 742
 743                 if (fd != -1) {
 744                         if (close(fd) < 0 && !haderr)
 745                                 haderr = errno;
 746                         fd = -1;
 747                 }
 748                 if (!haderr)
 749                         (void) atomicio(vwrite, remout, "", 1);
 750                 else
 751                         run_err("%s: %s", name, strerror(haderr));
 752                 (void) response();
 753         }
 754 }
 755
 756 void
 757 rsource(char *name, struct stat *statp)
 758 {
 759         DIR *dirp;
 760         struct dirent *dp;
 761         char *last, *vect[1], path[1100];
 762
 763         if (!(dirp = opendir(name))) {
 764                 run_err("%s: %s", name, strerror(errno));
 765                 return;
 766         }
 767         last = strrchr(name, '/');
 768         if (last == 0)
 769                 last = name;
 770         else
 771                 last++;
 772         if (pflag) {
 773                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 774                     (u_long) statp->st_mtime,
 775                     (u_long) statp->st_atime);
 776                 (void) atomicio(vwrite, remout, path, strlen(path));
 777                 if (response() < 0) {
 778                         closedir(dirp);
 779                         return;
 780                 }
 781         }
 782         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 783             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 784         if (verbose_mode)
 785                 fprintf(stderr, "Entering directory: %s", path);
 786         (void) atomicio(vwrite, remout, path, strlen(path));
 787         if (response() < 0) {
 788                 closedir(dirp);
 789                 return;
 790         }
 791         while ((dp = readdir(dirp)) != NULL) {
 792                 if (dp->d_ino == 0)
 793                         continue;
 794                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 795                         continue;
 796                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 797                         run_err("%s/%s: name too long", name, dp->d_name);
 798                         continue;
 799                 }
 800                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 801                 vect[0] = path;
 802                 source(1, vect);
 803         }
 804         (void) closedir(dirp);
 805         (void) atomicio(vwrite, remout, "E\n", 2);
 806         (void) response();
 807 }
 808
 809 void
 810 bwlimit(int amount)
 811 {
 812         static struct timeval bwstart, bwend;
 813         static int lamt, thresh = 16384;
 814         u_int64_t waitlen;
 815         struct timespec ts, rm;
 816
 817         if (!timerisset(&bwstart)) {
 818                 gettimeofday(&bwstart, NULL);
 819                 return;
 820         }
 821
 822         lamt += amount;
 823         if (lamt < thresh)
 824                 return;
 825
 826         gettimeofday(&bwend, NULL);
 827         timersub(&bwend, &bwstart, &bwend);
 828         if (!timerisset(&bwend))
 829                 return;
 830
 831         lamt *= 8;
 832         waitlen = (double)1000000L * lamt / limit_rate;
 833
 834         bwstart.tv_sec = waitlen / 1000000L;
 835         bwstart.tv_usec = waitlen % 1000000L;
 836
 837         if (timercmp(&bwstart, &bwend, >)) {
 838                 timersub(&bwstart, &bwend, &bwend);
 839
 840                 /* Adjust the wait time */
 841                 if (bwend.tv_sec) {
 842                         thresh /= 2;
 843                         if (thresh < 2048)
 844                                 thresh = 2048;
 845                 } else if (bwend.tv_usec < 10000) {
 846                         thresh *= 2;
 847                         if (thresh > COPY_BUFLEN * 4)
 848                                 thresh = COPY_BUFLEN * 4;
 849                 }
 850
 851                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 852                 while (nanosleep(&ts, &rm) == -1) {
 853                         if (errno != EINTR)
 854                                 break;
 855                         ts = rm;
 856                 }
 857         }
 858
 859         lamt = 0;
 860         gettimeofday(&bwstart, NULL);
 861 }
 862
 863 void
 864 sink(int argc, char **argv)
 865 {
 866         static BUF buffer;
 867         struct stat stb;
 868         enum {
 869                 YES, NO, DISPLAYED
 870         } wrerr;
 871         BUF *bp;
 872         off_t i;
 873         size_t j, count;
 874         int amt, exists, first, ofd;
 875         mode_t mode, omode, mask;
 876         off_t size, statbytes;
 877         int setimes, targisdir, wrerrno = 0;
 878         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 879         struct timeval tv[2];
 880
 881 #define atime   tv[0]
 882 #define mtime   tv[1]
 883 #define SCREWUP(str)    { why = str; goto screwup; }
 884
 885         setimes = targisdir = 0;
 886         mask = umask(0);
 887         if (!pflag)
 888                 (void) umask(mask);
 889         if (argc != 1) {
 890                 run_err("ambiguous target");
 891                 exit(1);
 892         }
 893         targ = *argv;
 894         if (targetshouldbedirectory)
 895                 verifydir(targ);
 896
 897         (void) atomicio(vwrite, remout, "", 1);
 898         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 899                 targisdir = 1;
 900         for (first = 1;; first = 0) {
 901                 cp = buf;
 902                 if (atomicio(read, remin, cp, 1) != 1)
 903                         return;
 904                 if (*cp++ == '\n')
 905                         SCREWUP("unexpected <newline>");
 906                 do {
 907                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 908                                 SCREWUP("lost connection");
 909                         *cp++ = ch;
 910                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 911                 *cp = 0;
 912                 if (verbose_mode)
 913                         fprintf(stderr, "Sink: %s", buf);
 914
 915                 if (buf[0] == '\01' || buf[0] == '\02') {
 916                         if (iamremote == 0)
 917                                 (void) atomicio(vwrite, STDERR_FILENO,
 918                                     buf + 1, strlen(buf + 1));
 919                         if (buf[0] == '\02')
 920                                 exit(1);
 921                         ++errs;
 922                         continue;
 923                 }
 924                 if (buf[0] == 'E') {
 925                         (void) atomicio(vwrite, remout, "", 1);
 926                         return;
 927                 }
 928                 if (ch == '\n')
 929                         *--cp = 0;
 930
 931                 cp = buf;
 932                 if (*cp == 'T') {
 933                         setimes++;
 934                         cp++;
 935                         mtime.tv_sec = strtol(cp, &cp, 10);
 936                         if (!cp || *cp++ != ' ')
 937                                 SCREWUP("mtime.sec not delimited");
 938                         mtime.tv_usec = strtol(cp, &cp, 10);
 939                         if (!cp || *cp++ != ' ')
 940                                 SCREWUP("mtime.usec not delimited");
 941                         atime.tv_sec = strtol(cp, &cp, 10);
 942                         if (!cp || *cp++ != ' ')
 943                                 SCREWUP("atime.sec not delimited");
 944                         atime.tv_usec = strtol(cp, &cp, 10);
 945                         if (!cp || *cp++ != '\0')
 946                                 SCREWUP("atime.usec not delimited");
 947                         (void) atomicio(vwrite, remout, "", 1);
 948                         continue;
 949                 }
 950                 if (*cp != 'C' && *cp != 'D') {
 951                         /*
 952                          * Check for the case "rcp remote:foo\* local:bar".
 953                          * In this case, the line "No match." can be returned
 954                          * by the shell before the rcp command on the remote is
 955                          * executed so the ^Aerror_message convention isn't
 956                          * followed.
 957                          */
 958                         if (first) {
 959                                 run_err("%s", cp);
 960                                 exit(1);
 961                         }
 962                         SCREWUP("expected control record");
 963                 }
 964                 mode = 0;
 965                 for (++cp; cp < buf + 5; cp++) {
 966                         if (*cp < '0' || *cp > '7')
 967                                 SCREWUP("bad mode");
 968                         mode = (mode << 3) | (*cp - '0');
 969                 }
 970                 if (*cp++ != ' ')
 971                         SCREWUP("mode not delimited");
 972
 973                 for (size = 0; isdigit(*cp);)
 974                         size = size * 10 + (*cp++ - '0');
 975                 if (*cp++ != ' ')
 976                         SCREWUP("size not delimited");
 977                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 978                         run_err("error: unexpected filename: %s", cp);
 979                         exit(1);
 980                 }
 981                 if (targisdir) {
 982                         static char *namebuf;
 983                         static size_t cursize;
 984                         size_t need;
 985
 986                         need = strlen(targ) + strlen(cp) + 250;
 987                         if (need > cursize) {
 988                                 if (namebuf)
 989                                         xfree(namebuf);
 990                                 namebuf = xmalloc(need);
 991                                 cursize = need;
 992                         }
 993                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 994                             strcmp(targ, "/") ? "/" : "", cp);
 995                         np = namebuf;
 996                 } else
 997                         np = targ;
 998                 curfile = cp;
 999                 exists = stat(np, &stb) == 0;
1000                 if (buf[0] == 'D') {
1001                         int mod_flag = pflag;
1002                         if (!iamrecursive)
1003                                 SCREWUP("received directory without -r");
1004                         if (exists) {
1005                                 if (!S_ISDIR(stb.st_mode)) {
1006                                         errno = ENOTDIR;
1007                                         goto bad;
1008                                 }
1009                                 if (pflag)
1010                                         (void) chmod(np, mode);
1011                         } else {
1012                                 /* Handle copying from a read-only
1013                                    directory */
1014                                 mod_flag = 1;
1015                                 if (mkdir(np, mode | S_IRWXU) < 0)
1016                                         goto bad;
1017                         }
1018                         vect[0] = xstrdup(np);
1019                         sink(1, vect);
1020                         if (setimes) {
1021                                 setimes = 0;
1022                                 if (utimes(vect[0], tv) < 0)
1023                                         run_err("%s: set times: %s",
1024                                             vect[0], strerror(errno));
1025                         }
1026                         if (mod_flag)
1027                                 (void) chmod(vect[0], mode);
1028                         if (vect[0])
1029                                 xfree(vect[0]);
1030                         continue;
1031                 }
1032                 omode = mode;
1033                 mode |= S_IWRITE;
1034                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1035 bad:                    run_err("%s: %s", np, strerror(errno));
1036                         continue;
1037                 }
1038                 (void) atomicio(vwrite, remout, "", 1);
1039                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1040                         (void) close(ofd);
1041                         continue;
1042                 }
1043                 cp = bp->buf;
1044                 wrerr = NO;
1045
1046                 statbytes = 0;
1047                 if (showprogress)
1048                         start_progress_meter(curfile, size, &statbytes);
1049                 set_nonblock(remin);
1050                 for (count = i = 0; i < size; i += bp->cnt) {
1051                         amt = bp->cnt;
1052                         if (i + amt > size)
1053                                 amt = size - i;
1054                         count += amt;
1055                         do {
1056                                 j = scpio(read, remin, cp, amt, &statbytes);
1057                                 if (j == 0) {
1058                                         run_err("%s", j != EPIPE ?
1059                                             strerror(errno) :
1060                                             "dropped connection");
1061                                         exit(1);
1062                                 }
1063                                 amt -= j;
1064                                 cp += j;
1065                         } while (amt > 0);
1066
1067                         if (count == bp->cnt) {
1068                                 /* Keep reading so we stay sync'd up. */
1069                                 if (wrerr == NO) {
1070                                         if (atomicio(vwrite, ofd, bp->buf,
1071                                             count) != count) {
1072                                                 wrerr = YES;
1073                                                 wrerrno = errno;
1074                                         }
1075                                 }
1076                                 count = 0;
1077                                 cp = bp->buf;
1078                         }
1079                 }
1080                 unset_nonblock(remin);
1081                 if (showprogress)
1082                         stop_progress_meter();
1083                 if (count != 0 && wrerr == NO &&
1084                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1085                         wrerr = YES;
1086                         wrerrno = errno;
1087                 }
1088                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1089                     ftruncate(ofd, size) != 0) {
1090                         run_err("%s: truncate: %s", np, strerror(errno));
1091                         wrerr = DISPLAYED;
1092                 }
1093                 if (pflag) {
1094                         if (exists || omode != mode)
1095 #ifdef HAVE_FCHMOD
1096                                 if (fchmod(ofd, omode)) {
1097 #else /* HAVE_FCHMOD */
1098                                 if (chmod(np, omode)) {
1099 #endif /* HAVE_FCHMOD */
1100                                         run_err("%s: set mode: %s",
1101                                             np, strerror(errno));
1102                                         wrerr = DISPLAYED;
1103                                 }
1104                 } else {
1105                         if (!exists && omode != mode)
1106 #ifdef HAVE_FCHMOD
1107                                 if (fchmod(ofd, omode & ~mask)) {
1108 #else /* HAVE_FCHMOD */
1109                                 if (chmod(np, omode & ~mask)) {
1110 #endif /* HAVE_FCHMOD */
1111                                         run_err("%s: set mode: %s",
1112                                             np, strerror(errno));
1113                                         wrerr = DISPLAYED;
1114                                 }
1115                 }
1116                 if (close(ofd) == -1) {
1117                         wrerr = YES;
1118                         wrerrno = errno;
1119                 }
1120                 (void) response();
1121                 if (setimes && wrerr == NO) {
1122                         setimes = 0;
1123                         if (utimes(np, tv) < 0) {
1124                                 run_err("%s: set times: %s",
1125                                     np, strerror(errno));
1126                                 wrerr = DISPLAYED;
1127                         }
1128                 }
1129                 switch (wrerr) {
1130                 case YES:
1131                         run_err("%s: %s", np, strerror(wrerrno));
1132                         break;
1133                 case NO:
1134                         (void) atomicio(vwrite, remout, "", 1);
1135                         break;
1136                 case DISPLAYED:
1137                         break;
1138                 }
1139         }
1140 screwup:
1141         run_err("protocol error: %s", why);
1142         exit(1);
1143 }
1144
1145 int
1146 response(void)
1147 {
1148         char ch, *cp, resp, rbuf[2048];
1149
1150         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1151                 lostconn(0);
1152
1153         cp = rbuf;
1154         switch (resp) {
1155         case 0:         /* ok */
1156                 return (0);
1157         default:
1158                 *cp++ = resp;
1159                 /* FALLTHROUGH */
1160         case 1:         /* error, followed by error msg */
1161         case 2:         /* fatal error, "" */
1162                 do {
1163                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1164                                 lostconn(0);
1165                         *cp++ = ch;
1166                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1167
1168                 if (!iamremote)
1169                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1170                 ++errs;
1171                 if (resp == 1)
1172                         return (-1);
1173                 exit(1);
1174         }
1175         /* NOTREACHED */
1176 }
1177
1178 void
1179 usage(void)
1180 {
1181         (void) fprintf(stderr,
1182             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1183             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1184             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1185         exit(1);
1186 }
1187
1188 void
1189 run_err(const char *fmt,...)
1190 {
1191         static FILE *fp;
1192         va_list ap;
1193
1194         ++errs;
1195         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1196                 (void) fprintf(fp, "%c", 0x01);
1197                 (void) fprintf(fp, "scp: ");
1198                 va_start(ap, fmt);
1199                 (void) vfprintf(fp, fmt, ap);
1200                 va_end(ap);
1201                 (void) fprintf(fp, "\n");
1202                 (void) fflush(fp);
1203         }
1204
1205         if (!iamremote) {
1206                 va_start(ap, fmt);
1207                 vfprintf(stderr, fmt, ap);
1208                 va_end(ap);
1209                 fprintf(stderr, "\n");
1210         }
1211 }
1212
1213 void
1214 verifydir(char *cp)
1215 {
1216         struct stat stb;
1217
1218         if (!stat(cp, &stb)) {
1219                 if (S_ISDIR(stb.st_mode))
1220                         return;
1221                 errno = ENOTDIR;
1222         }
1223         run_err("%s: %s", cp, strerror(errno));
1224         killchild(0);
1225 }
1226
1227 int
1228 okname(char *cp0)
1229 {
1230         int c;
1231         char *cp;
1232
1233         cp = cp0;
1234         do {
1235                 c = (int)*cp;
1236                 if (c & 0200)
1237                         goto bad;
1238                 if (!isalpha(c) && !isdigit(c)) {
1239                         switch (c) {
1240                         case '\'':
1241                         case '"':
1242                         case '`':
1243                         case ' ':
1244                         case '#':
1245                                 goto bad;
1246                         default:
1247                                 break;
1248                         }
1249                 }
1250         } while (*++cp);
1251         return (1);
1252
1253 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1254         return (0);
1255 }
1256
1257 BUF *
1258 allocbuf(BUF *bp, int fd, int blksize)
1259 {
1260         size_t size;
1261 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1262         struct stat stb;
1263
1264         if (fstat(fd, &stb) < 0) {
1265                 run_err("fstat: %s", strerror(errno));
1266                 return (0);
1267         }
1268         size = roundup(stb.st_blksize, blksize);
1269         if (size == 0)
1270                 size = blksize;
1271 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1272         size = blksize;
1273 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1274         if (bp->cnt >= size)
1275                 return (bp);
1276         if (bp->buf == NULL)
1277                 bp->buf = xmalloc(size);
1278         else
1279                 bp->buf = xrealloc(bp->buf, 1, size);
1280         memset(bp->buf, 0, size);
1281         bp->cnt = size;
1282         return (bp);
1283 }
1284
1285 void
1286 lostconn(int signo)
1287 {
1288         if (!iamremote)
1289                 write(STDERR_FILENO, "lost connection\n", 16);
1290         if (signo)
1291                 _exit(1);
1292         else
1293                 exit(1);
1294 }