crypto/external/bsd/openssh/dist/scp.c

   1 /*      $NetBSD: scp.c,v 1.2 2009/06/07 22:38:47 christos Exp $ */
   2 /* $OpenBSD: scp.c,v 1.164 2008/10/10 04:55:16 stevesk Exp $ */
   3 /*
   4  * scp - secure remote copy.  This is basically patched BSD rcp which
   5  * uses ssh to do the data transfer (instead of using rcmd).
   6  *
   7  * NOTE: This version should NOT be suid root.  (This uses ssh to
   8  * do the transfer and ssh has the necessary privileges.)
   9  *
  10  * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
  11  *
  12  * As far as I am concerned, the code I have written for this software
  13  * can be used freely for any purpose.  Any derived versions of this
  14  * software must be clearly marked as such, and if the derived work is
  15  * incompatible with the protocol description in the RFC file, it must be
  16  * called by a name other than "ssh" or "Secure Shell".
  17  */
  18 /*
  19  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  20  * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  32  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  33  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  34  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  35  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  36  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  37  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  38  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  39  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  40  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  41  */
  42
  43 /*
  44  * Parts from:
  45  *
  46  * Copyright (c) 1983, 1990, 1992, 1993, 1995
  47  *      The Regents of the University of California.  All rights reserved.
  48  *
  49  * Redistribution and use in source and binary forms, with or without
  50  * modification, are permitted provided that the following conditions
  51  * are met:
  52  * 1. Redistributions of source code must retain the above copyright
  53  *    notice, this list of conditions and the following disclaimer.
  54  * 2. Redistributions in binary form must reproduce the above copyright
  55  *    notice, this list of conditions and the following disclaimer in the
  56  *    documentation and/or other materials provided with the distribution.
  57  * 3. Neither the name of the University nor the names of its contributors
  58  *    may be used to endorse or promote products derived from this software
  59  *    without specific prior written permission.
  60  *
  61  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  62  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  63  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  64  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  65  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  66  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  67  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  68  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  69  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  70  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  71  * SUCH DAMAGE.
  72  *
  73  */
  74
  75 #include "includes.h"
  76 __RCSID("$NetBSD: scp.c,v 1.2 2009/06/07 22:38:47 christos Exp $");
  77 #include <sys/param.h>
  78 #include <sys/types.h>
  79 #include <sys/poll.h>
  80 #include <sys/wait.h>
  81 #include <sys/stat.h>
  82 #include <sys/time.h>
  83 #include <sys/uio.h>
  84
  85 #include <ctype.h>
  86 #include <dirent.h>
  87 #include <errno.h>
  88 #include <fcntl.h>
  89 #include <pwd.h>
  90 #include <signal.h>
  91 #include <stdarg.h>
  92 #include <stdio.h>
  93 #include <stdlib.h>
  94 #include <string.h>
  95 #include <time.h>
  96 #include <unistd.h>
  97 #include <vis.h>
  98
  99 #include "xmalloc.h"
 100 #include "atomicio.h"
 101 #include "pathnames.h"
 102 #include "log.h"
 103 #include "misc.h"
 104 #include "progressmeter.h"
 105
 106 #define COPY_BUFLEN     16384
 107
 108 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 109
 110 void bwlimit(int);
 111
 112 /* Struct for addargs */
 113 arglist args;
 114
 115 /* Bandwidth limit */
 116 off_t limit_rate = 0;
 117
 118 /* Name of current file being transferred. */
 119 char *curfile;
 120
 121 /* This is set to non-zero to enable verbose mode. */
 122 int verbose_mode = 0;
 123
 124 /* This is set to zero if the progressmeter is not desired. */
 125 int showprogress = 1;
 126
 127 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 128 #ifdef RESCUEDIR
 129 char *ssh_program = RESCUEDIR "/ssh";
 130 #else
 131 char *ssh_program = _PATH_SSH_PROGRAM;
 132 #endif
 133
 134 /* This is used to store the pid of ssh_program */
 135 pid_t do_cmd_pid = -1;
 136
 137 static void
 138 killchild(int signo)
 139 {
 140         if (do_cmd_pid > 1) {
 141                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 142                 waitpid(do_cmd_pid, NULL, 0);
 143         }
 144
 145         if (signo)
 146                 _exit(1);
 147         exit(1);
 148 }
 149
 150 static int
 151 do_local_cmd(arglist *a)
 152 {
 153         u_int i;
 154         int status;
 155         pid_t pid;
 156
 157         if (a->num == 0)
 158                 fatal("do_local_cmd: no arguments");
 159
 160         if (verbose_mode) {
 161                 fprintf(stderr, "Executing:");
 162                 for (i = 0; i < a->num; i++)
 163                         fprintf(stderr, " %s", a->list[i]);
 164                 fprintf(stderr, "\n");
 165         }
 166         if ((pid = fork()) == -1)
 167                 fatal("do_local_cmd: fork: %s", strerror(errno));
 168
 169         if (pid == 0) {
 170                 execvp(a->list[0], a->list);
 171                 perror(a->list[0]);
 172                 exit(1);
 173         }
 174
 175         do_cmd_pid = pid;
 176         signal(SIGTERM, killchild);
 177         signal(SIGINT, killchild);
 178         signal(SIGHUP, killchild);
 179
 180         while (waitpid(pid, &status, 0) == -1)
 181                 if (errno != EINTR)
 182                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 183
 184         do_cmd_pid = -1;
 185
 186         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 187                 return (-1);
 188
 189         return (0);
 190 }
 191
 192 /*
 193  * This function executes the given command as the specified user on the
 194  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 195  * assigns the input and output file descriptors on success.
 196  */
 197
 198 int
 199 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 200 {
 201         int pin[2], pout[2], reserved[2];
 202
 203         if (verbose_mode)
 204                 fprintf(stderr,
 205                     "Executing: program %s host %s, user %s, command %s\n",
 206                     ssh_program, host,
 207                     remuser ? remuser : "(unspecified)", cmd);
 208
 209         /*
 210          * Reserve two descriptors so that the real pipes won't get
 211          * descriptors 0 and 1 because that will screw up dup2 below.
 212          */
 213         if (pipe(reserved) < 0)
 214                 fatal("pipe: %s", strerror(errno));
 215
 216         /* Create a socket pair for communicating with ssh. */
 217         if (pipe(pin) < 0)
 218                 fatal("pipe: %s", strerror(errno));
 219         if (pipe(pout) < 0)
 220                 fatal("pipe: %s", strerror(errno));
 221
 222         /* Free the reserved descriptors. */
 223         close(reserved[0]);
 224         close(reserved[1]);
 225
 226         /* Fork a child to execute the command on the remote host using ssh. */
 227         do_cmd_pid = fork();
 228         if (do_cmd_pid == 0) {
 229                 /* Child. */
 230                 close(pin[1]);
 231                 close(pout[0]);
 232                 dup2(pin[0], 0);
 233                 dup2(pout[1], 1);
 234                 close(pin[0]);
 235                 close(pout[1]);
 236
 237                 replacearg(&args, 0, "%s", ssh_program);
 238                 if (remuser != NULL)
 239                         addargs(&args, "-l%s", remuser);
 240                 addargs(&args, "%s", host);
 241                 addargs(&args, "%s", cmd);
 242
 243                 execvp(ssh_program, args.list);
 244                 perror(ssh_program);
 245                 exit(1);
 246         } else if (do_cmd_pid == -1) {
 247                 fatal("fork: %s", strerror(errno));
 248         }
 249         /* Parent.  Close the other side, and return the local side. */
 250         close(pin[0]);
 251         *fdout = pin[1];
 252         close(pout[1]);
 253         *fdin = pout[0];
 254         signal(SIGTERM, killchild);
 255         signal(SIGINT, killchild);
 256         signal(SIGHUP, killchild);
 257         return 0;
 258 }
 259
 260 typedef struct {
 261         size_t cnt;
 262         char *buf;
 263 } BUF;
 264
 265 BUF *allocbuf(BUF *, int, int);
 266 void lostconn(int);
 267 int okname(char *);
 268 void run_err(const char *,...);
 269 void verifydir(char *);
 270
 271 struct passwd *pwd;
 272 uid_t userid;
 273 int errs, remin, remout;
 274 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 275
 276 #define CMDNEEDS        64
 277 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 278
 279 int response(void);
 280 void rsource(char *, struct stat *);
 281 void sink(int, char *[]);
 282 void source(int, char *[]);
 283 void tolocal(int, char *[]);
 284 void toremote(char *, int, char *[]);
 285 void usage(void);
 286
 287 int
 288 main(int argc, char **argv)
 289 {
 290         int ch, fflag, tflag, status, n;
 291         double speed;
 292         char *targ, *endp, **newargv;
 293         extern char *optarg;
 294         extern int optind;
 295
 296         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 297         sanitise_stdfd();
 298
 299         /* Copy argv, because we modify it */
 300         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 301         for (n = 0; n < argc; n++)
 302                 newargv[n] = xstrdup(argv[n]);
 303         argv = newargv;
 304
 305         memset(&args, '\0', sizeof(args));
 306         args.list = NULL;
 307         addargs(&args, "%s", ssh_program);
 308         addargs(&args, "-x");
 309         addargs(&args, "-oForwardAgent no");
 310         addargs(&args, "-oPermitLocalCommand no");
 311         addargs(&args, "-oClearAllForwardings yes");
 312
 313         fflag = tflag = 0;
 314         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 315                 switch (ch) {
 316                 /* User-visible flags. */
 317                 case '1':
 318                 case '2':
 319                 case '4':
 320                 case '6':
 321                 case 'C':
 322                         addargs(&args, "-%c", ch);
 323                         break;
 324                 case 'o':
 325                 case 'c':
 326                 case 'i':
 327                 case 'F':
 328                         addargs(&args, "-%c%s", ch, optarg);
 329                         break;
 330                 case 'P':
 331                         addargs(&args, "-p%s", optarg);
 332                         break;
 333                 case 'B':
 334                         addargs(&args, "-oBatchmode yes");
 335                         break;
 336                 case 'l':
 337                         speed = strtod(optarg, &endp);
 338                         if (speed <= 0 || *endp != '\0')
 339                                 usage();
 340                         limit_rate = speed * 1024;
 341                         break;
 342                 case 'p':
 343                         pflag = 1;
 344                         break;
 345                 case 'r':
 346                         iamrecursive = 1;
 347                         break;
 348                 case 'S':
 349                         ssh_program = xstrdup(optarg);
 350                         break;
 351                 case 'v':
 352                         addargs(&args, "-v");
 353                         verbose_mode = 1;
 354                         break;
 355                 case 'q':
 356                         addargs(&args, "-q");
 357                         showprogress = 0;
 358                         break;
 359
 360                 /* Server options. */
 361                 case 'd':
 362                         targetshouldbedirectory = 1;
 363                         break;
 364                 case 'f':       /* "from" */
 365                         iamremote = 1;
 366                         fflag = 1;
 367                         break;
 368                 case 't':       /* "to" */
 369                         iamremote = 1;
 370                         tflag = 1;
 371                         break;
 372                 default:
 373                         usage();
 374                 }
 375         argc -= optind;
 376         argv += optind;
 377
 378         if ((pwd = getpwuid(userid = getuid())) == NULL)
 379                 fatal("unknown user %u", (u_int) userid);
 380
 381         if (!isatty(STDOUT_FILENO))
 382                 showprogress = 0;
 383
 384         remin = STDIN_FILENO;
 385         remout = STDOUT_FILENO;
 386
 387         if (fflag) {
 388                 /* Follow "protocol", send data. */
 389                 (void) response();
 390                 source(argc, argv);
 391                 exit(errs != 0);
 392         }
 393         if (tflag) {
 394                 /* Receive data. */
 395                 sink(argc, argv);
 396                 exit(errs != 0);
 397         }
 398         if (argc < 2)
 399                 usage();
 400         if (argc > 2)
 401                 targetshouldbedirectory = 1;
 402
 403         remin = remout = -1;
 404         do_cmd_pid = -1;
 405         /* Command to be executed on remote system using "ssh". */
 406         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 407             verbose_mode ? " -v" : "",
 408             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 409             targetshouldbedirectory ? " -d" : "");
 410
 411         (void) signal(SIGPIPE, lostconn);
 412
 413         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 414                 toremote(targ, argc, argv);
 415         else {
 416                 if (targetshouldbedirectory)
 417                         verifydir(argv[argc - 1]);
 418                 tolocal(argc, argv);    /* Dest is local host. */
 419         }
 420         /*
 421          * Finally check the exit status of the ssh process, if one was forked
 422          * and no error has occurred yet
 423          */
 424         if (do_cmd_pid != -1 && errs == 0) {
 425                 if (remin != -1)
 426                     (void) close(remin);
 427                 if (remout != -1)
 428                     (void) close(remout);
 429                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 430                         errs = 1;
 431                 else {
 432                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 433                                 errs = 1;
 434                 }
 435         }
 436         exit(errs != 0);
 437 }
 438
 439 /*
 440  * atomicio-like wrapper that also applies bandwidth limits and updates
 441  * the progressmeter counter.
 442  */
 443 static size_t
 444 scpio(ssize_t (*f)(int, void *, size_t), int fd, void *_p, size_t l, off_t *c)
 445 {
 446         u_char *p = (u_char *)_p;
 447         size_t offset;
 448         ssize_t r;
 449         struct pollfd pfd;
 450
 451         pfd.fd = fd;
 452         pfd.events = f == read ? POLLIN : POLLOUT;
 453         for (offset = 0; offset < l;) {
 454                 r = f(fd, p + offset, l - offset);
 455                 if (r == 0) {
 456                         errno = EPIPE;
 457                         return offset;
 458                 }
 459                 if (r < 0) {
 460                         if (errno == EINTR)
 461                                 continue;
 462                         if (errno == EAGAIN) {
 463                                 (void)poll(&pfd, 1, -1); /* Ignore errors */
 464                                 continue;
 465                         }
 466                         return offset;
 467                 }
 468                 offset += (size_t)r;
 469                 *c += (off_t)r;
 470                 if (limit_rate)
 471                         bwlimit(r);
 472         }
 473         return offset;
 474 }
 475
 476 void
 477 toremote(char *targ, int argc, char **argv)
 478 {
 479         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 480         arglist alist;
 481         int i;
 482
 483         memset(&alist, '\0', sizeof(alist));
 484         alist.list = NULL;
 485
 486         *targ++ = 0;
 487         if (*targ == 0)
 488                 targ = ".";
 489
 490         arg = xstrdup(argv[argc - 1]);
 491         if ((thost = strrchr(arg, '@'))) {
 492                 /* user@host */
 493                 *thost++ = 0;
 494                 tuser = arg;
 495                 if (*tuser == '\0')
 496                         tuser = NULL;
 497         } else {
 498                 thost = arg;
 499                 tuser = NULL;
 500         }
 501
 502         if (tuser != NULL && !okname(tuser)) {
 503                 xfree(arg);
 504                 return;
 505         }
 506
 507         for (i = 0; i < argc - 1; i++) {
 508                 src = colon(argv[i]);
 509                 if (src) {      /* remote to remote */
 510                         freeargs(&alist);
 511                         addargs(&alist, "%s", ssh_program);
 512                         if (verbose_mode)
 513                                 addargs(&alist, "-v");
 514                         addargs(&alist, "-x");
 515                         addargs(&alist, "-oClearAllForwardings yes");
 516                         addargs(&alist, "-n");
 517
 518                         *src++ = 0;
 519                         if (*src == 0)
 520                                 src = ".";
 521                         host = strrchr(argv[i], '@');
 522
 523                         if (host) {
 524                                 *host++ = 0;
 525                                 host = cleanhostname(host);
 526                                 suser = argv[i];
 527                                 if (*suser == '\0')
 528                                         suser = pwd->pw_name;
 529                                 else if (!okname(suser))
 530                                         continue;
 531                                 addargs(&alist, "-l");
 532                                 addargs(&alist, "%s", suser);
 533                         } else {
 534                                 host = cleanhostname(argv[i]);
 535                         }
 536                         addargs(&alist, "%s", host);
 537                         addargs(&alist, "%s", cmd);
 538                         addargs(&alist, "%s", src);
 539                         addargs(&alist, "%s%s%s:%s",
 540                             tuser ? tuser : "", tuser ? "@" : "",
 541                             thost, targ);
 542                         if (do_local_cmd(&alist) != 0)
 543                                 errs = 1;
 544                 } else {        /* local to remote */
 545                         if (remin == -1) {
 546                                 xasprintf(&bp, "%s -t %s", cmd, targ);
 547                                 host = cleanhostname(thost);
 548                                 if (do_cmd(host, tuser, bp, &remin,
 549                                     &remout) < 0)
 550                                         exit(1);
 551                                 if (response() < 0)
 552                                         exit(1);
 553                                 (void) xfree(bp);
 554                         }
 555                         source(1, argv + i);
 556                 }
 557         }
 558         xfree(arg);
 559 }
 560
 561 void
 562 tolocal(int argc, char **argv)
 563 {
 564         char *bp, *host, *src, *suser;
 565         arglist alist;
 566         int i;
 567
 568         memset(&alist, '\0', sizeof(alist));
 569         alist.list = NULL;
 570
 571         for (i = 0; i < argc - 1; i++) {
 572                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 573                         freeargs(&alist);
 574                         addargs(&alist, "%s", _PATH_CP);
 575                         if (iamrecursive)
 576                                 addargs(&alist, "-r");
 577                         if (pflag)
 578                                 addargs(&alist, "-p");
 579                         addargs(&alist, "%s", argv[i]);
 580                         addargs(&alist, "%s", argv[argc-1]);
 581                         if (do_local_cmd(&alist))
 582                                 ++errs;
 583                         continue;
 584                 }
 585                 *src++ = 0;
 586                 if (*src == 0)
 587                         src = ".";
 588                 if ((host = strrchr(argv[i], '@')) == NULL) {
 589                         host = argv[i];
 590                         suser = NULL;
 591                 } else {
 592                         *host++ = 0;
 593                         suser = argv[i];
 594                         if (*suser == '\0')
 595                                 suser = pwd->pw_name;
 596                 }
 597                 host = cleanhostname(host);
 598                 xasprintf(&bp, "%s -f %s", cmd, src);
 599                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 600                         (void) xfree(bp);
 601                         ++errs;
 602                         continue;
 603                 }
 604                 xfree(bp);
 605                 sink(1, argv + argc - 1);
 606                 (void) close(remin);
 607                 remin = remout = -1;
 608         }
 609 }
 610
 611 void
 612 source(int argc, char **argv)
 613 {
 614         struct stat stb;
 615         static BUF buffer;
 616         BUF *bp;
 617         off_t i, statbytes;
 618         size_t amt;
 619         int fd = -1, haderr, indx;
 620         char *last, *name, buf[16384], encname[MAXPATHLEN];
 621         int len;
 622
 623         for (indx = 0; indx < argc; ++indx) {
 624                 fd = -1;
 625                 name = argv[indx];
 626                 statbytes = 0;
 627                 len = strlen(name);
 628                 while (len > 1 && name[len-1] == '/')
 629                         name[--len] = '\0';
 630                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 631                         goto syserr;
 632                 if (strchr(name, '\n') != NULL) {
 633                         strvisx(encname, name, len, VIS_NL);
 634                         name = encname;
 635                 }
 636                 if (fstat(fd, &stb) < 0) {
 637 syserr:                 run_err("%s: %s", name, strerror(errno));
 638                         goto next;
 639                 }
 640                 if (stb.st_size < 0) {
 641                         run_err("%s: %s", name, "Negative file size");
 642                         goto next;
 643                 }
 644                 unset_nonblock(fd);
 645                 switch (stb.st_mode & S_IFMT) {
 646                 case S_IFREG:
 647                         break;
 648                 case S_IFDIR:
 649                         if (iamrecursive) {
 650                                 rsource(name, &stb);
 651                                 goto next;
 652                         }
 653                         /* FALLTHROUGH */
 654                 default:
 655                         run_err("%s: not a regular file", name);
 656                         goto next;
 657                 }
 658                 if ((last = strrchr(name, '/')) == NULL)
 659                         last = name;
 660                 else
 661                         ++last;
 662                 curfile = last;
 663                 if (pflag) {
 664                         /*
 665                          * Make it compatible with possible future
 666                          * versions expecting microseconds.
 667                          */
 668                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 669                             (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime),
 670                             (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime));
 671                         if (verbose_mode) {
 672                                 fprintf(stderr, "File mtime %ld atime %ld\n",
 673                                     (long)stb.st_mtime, (long)stb.st_atime);
 674                                 fprintf(stderr, "Sending file timestamps: %s",
 675                                     buf);
 676                         }
 677                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 678                         if (response() < 0)
 679                                 goto next;
 680                 }
 681 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 682                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 683                     (u_int) (stb.st_mode & FILEMODEMASK),
 684                     (long long)stb.st_size, last);
 685                 if (verbose_mode) {
 686                         fprintf(stderr, "Sending file modes: %s", buf);
 687                 }
 688                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 689                 if (response() < 0)
 690                         goto next;
 691                 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
 692 next:                   if (fd != -1) {
 693                                 (void) close(fd);
 694                                 fd = -1;
 695                         }
 696                         continue;
 697                 }
 698                 if (showprogress)
 699                         start_progress_meter(curfile, stb.st_size, &statbytes);
 700                 set_nonblock(remout);
 701                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 702                         amt = bp->cnt;
 703                         if (i + (off_t)amt > stb.st_size)
 704                                 amt = stb.st_size - i;
 705                         if (!haderr) {
 706                                 if (atomicio(read, fd, bp->buf, amt) != amt)
 707                                         haderr = errno;
 708                         }
 709                         /* Keep writing after error to retain sync */
 710                         if (haderr) {
 711                                 (void)atomicio(vwrite, remout, bp->buf, amt);
 712                                 continue;
 713                         }
 714                         if (scpio(vwrite, remout, bp->buf, amt,
 715                             &statbytes) != amt)
 716                                 haderr = errno;
 717                 }
 718                 unset_nonblock(remout);
 719                 if (showprogress)
 720                         stop_progress_meter();
 721
 722                 if (fd != -1) {
 723                         if (close(fd) < 0 && !haderr)
 724                                 haderr = errno;
 725                         fd = -1;
 726                 }
 727                 if (!haderr)
 728                         (void) atomicio(vwrite, remout, "", 1);
 729                 else
 730                         run_err("%s: %s", name, strerror(haderr));
 731                 (void) response();
 732         }
 733 }
 734
 735 void
 736 rsource(char *name, struct stat *statp)
 737 {
 738         DIR *dirp;
 739         struct dirent *dp;
 740         char *last, *vect[1], path[1100];
 741
 742         if (!(dirp = opendir(name))) {
 743                 run_err("%s: %s", name, strerror(errno));
 744                 return;
 745         }
 746         last = strrchr(name, '/');
 747         if (last == 0)
 748                 last = name;
 749         else
 750                 last++;
 751         if (pflag) {
 752                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 753                     (u_long) statp->st_mtime,
 754                     (u_long) statp->st_atime);
 755                 (void) atomicio(vwrite, remout, path, strlen(path));
 756                 if (response() < 0) {
 757                         closedir(dirp);
 758                         return;
 759                 }
 760         }
 761         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 762             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 763         if (verbose_mode)
 764                 fprintf(stderr, "Entering directory: %s", path);
 765         (void) atomicio(vwrite, remout, path, strlen(path));
 766         if (response() < 0) {
 767                 closedir(dirp);
 768                 return;
 769         }
 770         while ((dp = readdir(dirp)) != NULL) {
 771                 if (dp->d_ino == 0)
 772                         continue;
 773                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 774                         continue;
 775                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 776                         run_err("%s/%s: name too long", name, dp->d_name);
 777                         continue;
 778                 }
 779                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 780                 vect[0] = path;
 781                 source(1, vect);
 782         }
 783         (void) closedir(dirp);
 784         (void) atomicio(vwrite, remout, "E\n", 2);
 785         (void) response();
 786 }
 787
 788 void
 789 bwlimit(int amount)
 790 {
 791         static struct timeval bwstart, bwend;
 792         static int lamt, thresh = 16384;
 793         u_int64_t waitlen;
 794         struct timespec ts, rm;
 795
 796         if (!timerisset(&bwstart)) {
 797                 gettimeofday(&bwstart, NULL);
 798                 return;
 799         }
 800
 801         lamt += amount;
 802         if (lamt < thresh)
 803                 return;
 804
 805         gettimeofday(&bwend, NULL);
 806         timersub(&bwend, &bwstart, &bwend);
 807         if (!timerisset(&bwend))
 808                 return;
 809
 810         lamt *= 8;
 811         waitlen = (double)1000000L * lamt / limit_rate;
 812
 813         bwstart.tv_sec = waitlen / 1000000L;
 814         bwstart.tv_usec = waitlen % 1000000L;
 815
 816         if (timercmp(&bwstart, &bwend, >)) {
 817                 timersub(&bwstart, &bwend, &bwend);
 818
 819                 /* Adjust the wait time */
 820                 if (bwend.tv_sec) {
 821                         thresh /= 2;
 822                         if (thresh < 2048)
 823                                 thresh = 2048;
 824                 } else if (bwend.tv_usec < 10000) {
 825                         thresh *= 2;
 826                         if (thresh > COPY_BUFLEN * 4)
 827                                 thresh = COPY_BUFLEN * 4;
 828                 }
 829
 830                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 831                 while (nanosleep(&ts, &rm) == -1) {
 832                         if (errno != EINTR)
 833                                 break;
 834                         ts = rm;
 835                 }
 836         }
 837
 838         lamt = 0;
 839         gettimeofday(&bwstart, NULL);
 840 }
 841
 842 void
 843 sink(int argc, char **argv)
 844 {
 845         static BUF buffer;
 846         struct stat stb;
 847         enum {
 848                 YES, NO, DISPLAYED
 849         } wrerr;
 850         BUF *bp;
 851         off_t i;
 852         size_t j, count;
 853         int amt, exists, first, ofd;
 854         mode_t mode, omode, mask;
 855         off_t size, statbytes;
 856         int setimes, targisdir, wrerrno = 0;
 857         char ch, *cp, *np, *targ, *why, *vect[1], buf[16384];
 858         struct timeval tv[2];
 859
 860 #define atime   tv[0]
 861 #define mtime   tv[1]
 862 #define SCREWUP(str)    { why = str; goto screwup; }
 863
 864         setimes = targisdir = 0;
 865         mask = umask(0);
 866         if (!pflag)
 867                 (void) umask(mask);
 868         if (argc != 1) {
 869                 run_err("ambiguous target");
 870                 exit(1);
 871         }
 872         targ = *argv;
 873         if (targetshouldbedirectory)
 874                 verifydir(targ);
 875
 876         (void) atomicio(vwrite, remout, "", 1);
 877         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 878                 targisdir = 1;
 879         for (first = 1;; first = 0) {
 880                 cp = buf;
 881                 if (atomicio(read, remin, cp, 1) != 1)
 882                         return;
 883                 if (*cp++ == '\n')
 884                         SCREWUP("unexpected <newline>");
 885                 do {
 886                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 887                                 SCREWUP("lost connection");
 888                         *cp++ = ch;
 889                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 890                 *cp = 0;
 891                 if (verbose_mode)
 892                         fprintf(stderr, "Sink: %s", buf);
 893
 894                 if (buf[0] == '\01' || buf[0] == '\02') {
 895                         if (iamremote == 0)
 896                                 (void) atomicio(vwrite, STDERR_FILENO,
 897                                     buf + 1, strlen(buf + 1));
 898                         if (buf[0] == '\02')
 899                                 exit(1);
 900                         ++errs;
 901                         continue;
 902                 }
 903                 if (buf[0] == 'E') {
 904                         (void) atomicio(vwrite, remout, "", 1);
 905                         return;
 906                 }
 907                 if (ch == '\n')
 908                         *--cp = 0;
 909
 910                 cp = buf;
 911                 if (*cp == 'T') {
 912                         setimes++;
 913                         cp++;
 914                         mtime.tv_sec = strtol(cp, &cp, 10);
 915                         if (!cp || *cp++ != ' ')
 916                                 SCREWUP("mtime.sec not delimited");
 917                         mtime.tv_usec = strtol(cp, &cp, 10);
 918                         if (!cp || *cp++ != ' ')
 919                                 SCREWUP("mtime.usec not delimited");
 920                         atime.tv_sec = strtol(cp, &cp, 10);
 921                         if (!cp || *cp++ != ' ')
 922                                 SCREWUP("atime.sec not delimited");
 923                         atime.tv_usec = strtol(cp, &cp, 10);
 924                         if (!cp || *cp++ != '\0')
 925                                 SCREWUP("atime.usec not delimited");
 926                         (void) atomicio(vwrite, remout, "", 1);
 927                         continue;
 928                 }
 929                 if (*cp != 'C' && *cp != 'D') {
 930                         /*
 931                          * Check for the case "rcp remote:foo\* local:bar".
 932                          * In this case, the line "No match." can be returned
 933                          * by the shell before the rcp command on the remote is
 934                          * executed so the ^Aerror_message convention isn't
 935                          * followed.
 936                          */
 937                         if (first) {
 938                                 run_err("%s", cp);
 939                                 exit(1);
 940                         }
 941                         SCREWUP("expected control record");
 942                 }
 943                 mode = 0;
 944                 for (++cp; cp < buf + 5; cp++) {
 945                         if (*cp < '0' || *cp > '7')
 946                                 SCREWUP("bad mode");
 947                         mode = (mode << 3) | (*cp - '0');
 948                 }
 949                 if (*cp++ != ' ')
 950                         SCREWUP("mode not delimited");
 951
 952                 for (size = 0; isdigit((unsigned char)*cp);)
 953                         size = size * 10 + (*cp++ - '0');
 954                 if (*cp++ != ' ')
 955                         SCREWUP("size not delimited");
 956                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 957                         run_err("error: unexpected filename: %s", cp);
 958                         exit(1);
 959                 }
 960                 if (targisdir) {
 961                         static char *namebuf;
 962                         static size_t cursize;
 963                         size_t need;
 964
 965                         need = strlen(targ) + strlen(cp) + 250;
 966                         if (need > cursize) {
 967                                 if (namebuf)
 968                                         xfree(namebuf);
 969                                 namebuf = xmalloc(need);
 970                                 cursize = need;
 971                         }
 972                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 973                             strcmp(targ, "/") ? "/" : "", cp);
 974                         np = namebuf;
 975                 } else
 976                         np = targ;
 977                 curfile = cp;
 978                 exists = stat(np, &stb) == 0;
 979                 if (buf[0] == 'D') {
 980                         int mod_flag = pflag;
 981                         if (!iamrecursive)
 982                                 SCREWUP("received directory without -r");
 983                         if (exists) {
 984                                 if (!S_ISDIR(stb.st_mode)) {
 985                                         errno = ENOTDIR;
 986                                         goto bad;
 987                                 }
 988                                 if (pflag)
 989                                         (void) chmod(np, mode);
 990                         } else {
 991                                 /* Handle copying from a read-only
 992                                    directory */
 993                                 mod_flag = 1;
 994                                 if (mkdir(np, mode | S_IRWXU) < 0)
 995                                         goto bad;
 996                         }
 997                         vect[0] = xstrdup(np);
 998                         sink(1, vect);
 999                         if (setimes) {
1000                                 setimes = 0;
1001                                 if (utimes(vect[0], tv) < 0)
1002                                         run_err("%s: set times: %s",
1003                                             vect[0], strerror(errno));
1004                         }
1005                         if (mod_flag)
1006                                 (void) chmod(vect[0], mode);
1007                         if (vect[0])
1008                                 xfree(vect[0]);
1009                         continue;
1010                 }
1011                 omode = mode;
1012                 mode |= S_IWRITE;
1013                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1014 bad:                    run_err("%s: %s", np, strerror(errno));
1015                         continue;
1016                 }
1017                 (void) atomicio(vwrite, remout, "", 1);
1018                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1019                         (void) close(ofd);
1020                         continue;
1021                 }
1022                 cp = bp->buf;
1023                 wrerr = NO;
1024
1025                 statbytes = 0;
1026                 if (showprogress)
1027                         start_progress_meter(curfile, size, &statbytes);
1028                 set_nonblock(remin);
1029                 for (count = i = 0; i < size; i += bp->cnt) {
1030                         amt = bp->cnt;
1031                         if (i + amt > size)
1032                                 amt = size - i;
1033                         count += amt;
1034                         do {
1035                                 j = scpio(read, remin, cp, amt, &statbytes);
1036                                 if (j == 0) {
1037                                         run_err("%s", j != EPIPE ?
1038                                             strerror(errno) :
1039                                             "dropped connection");
1040                                         exit(1);
1041                                 }
1042                                 amt -= j;
1043                                 cp += j;
1044                         } while (amt > 0);
1045
1046                         if (count == bp->cnt) {
1047                                 /* Keep reading so we stay sync'd up. */
1048                                 if (wrerr == NO) {
1049                                         if (atomicio(vwrite, ofd, bp->buf,
1050                                             count) != count) {
1051                                                 wrerr = YES;
1052                                                 wrerrno = errno;
1053                                         }
1054                                 }
1055                                 count = 0;
1056                                 cp = bp->buf;
1057                         }
1058                 }
1059                 unset_nonblock(remin);
1060                 if (showprogress)
1061                         stop_progress_meter();
1062                 if (count != 0 && wrerr == NO &&
1063                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1064                         wrerr = YES;
1065                         wrerrno = errno;
1066                 }
1067                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1068                     ftruncate(ofd, size) != 0) {
1069                         run_err("%s: truncate: %s", np, strerror(errno));
1070                         wrerr = DISPLAYED;
1071                 }
1072                 if (pflag) {
1073                         if (exists || omode != mode)
1074                                 if (fchmod(ofd, omode)) {
1075                                         run_err("%s: set mode: %s",
1076                                             np, strerror(errno));
1077                                         wrerr = DISPLAYED;
1078                                 }
1079                 } else {
1080                         if (!exists && omode != mode)
1081                                 if (fchmod(ofd, omode & ~mask)) {
1082                                         run_err("%s: set mode: %s",
1083                                             np, strerror(errno));
1084                                         wrerr = DISPLAYED;
1085                                 }
1086                 }
1087                 if (close(ofd) == -1) {
1088                         wrerr = YES;
1089                         wrerrno = errno;
1090                 }
1091                 (void) response();
1092                 if (setimes && wrerr == NO) {
1093                         setimes = 0;
1094                         if (utimes(np, tv) < 0) {
1095                                 run_err("%s: set times: %s",
1096                                     np, strerror(errno));
1097                                 wrerr = DISPLAYED;
1098                         }
1099                 }
1100                 switch (wrerr) {
1101                 case YES:
1102                         run_err("%s: %s", np, strerror(wrerrno));
1103                         break;
1104                 case NO:
1105                         (void) atomicio(vwrite, remout, "", 1);
1106                         break;
1107                 case DISPLAYED:
1108                         break;
1109                 }
1110         }
1111 screwup:
1112         run_err("protocol error: %s", why);
1113         exit(1);
1114 }
1115
1116 int
1117 response(void)
1118 {
1119         char ch, *cp, resp, rbuf[2048];
1120
1121         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1122                 lostconn(0);
1123
1124         cp = rbuf;
1125         switch (resp) {
1126         case 0:         /* ok */
1127                 return (0);
1128         default:
1129                 *cp++ = resp;
1130                 /* FALLTHROUGH */
1131         case 1:         /* error, followed by error msg */
1132         case 2:         /* fatal error, "" */
1133                 do {
1134                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1135                                 lostconn(0);
1136                         *cp++ = ch;
1137                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1138
1139                 if (!iamremote)
1140                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1141                 ++errs;
1142                 if (resp == 1)
1143                         return (-1);
1144                 exit(1);
1145         }
1146         /* NOTREACHED */
1147 }
1148
1149 void
1150 usage(void)
1151 {
1152         (void) fprintf(stderr,
1153             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1154             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1155             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1156         exit(1);
1157 }
1158
1159 void
1160 run_err(const char *fmt,...)
1161 {
1162         static FILE *fp;
1163         va_list ap;
1164
1165         ++errs;
1166         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1167                 (void) fprintf(fp, "%c", 0x01);
1168                 (void) fprintf(fp, "scp: ");
1169                 va_start(ap, fmt);
1170                 (void) vfprintf(fp, fmt, ap);
1171                 va_end(ap);
1172                 (void) fprintf(fp, "\n");
1173                 (void) fflush(fp);
1174         }
1175
1176         if (!iamremote) {
1177                 va_start(ap, fmt);
1178                 vfprintf(stderr, fmt, ap);
1179                 va_end(ap);
1180                 fprintf(stderr, "\n");
1181         }
1182 }
1183
1184 void
1185 verifydir(char *cp)
1186 {
1187         struct stat stb;
1188
1189         if (!stat(cp, &stb)) {
1190                 if (S_ISDIR(stb.st_mode))
1191                         return;
1192                 errno = ENOTDIR;
1193         }
1194         run_err("%s: %s", cp, strerror(errno));
1195         killchild(0);
1196 }
1197
1198 int
1199 okname(char *cp0)
1200 {
1201         int c;
1202         char *cp;
1203
1204         cp = cp0;
1205         do {
1206                 c = (int)*cp;
1207                 if (c & 0200)
1208                         goto bad;
1209                 if (!isalpha(c) && !isdigit(c)) {
1210                         switch (c) {
1211                         case '\'':
1212                         case '"':
1213                         case '`':
1214                         case ' ':
1215                         case '#':
1216                                 goto bad;
1217                         default:
1218                                 break;
1219                         }
1220                 }
1221         } while (*++cp);
1222         return (1);
1223
1224 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1225         return (0);
1226 }
1227
1228 BUF *
1229 allocbuf(BUF *bp, int fd, int blksize)
1230 {
1231         size_t size;
1232         struct stat stb;
1233
1234         if (fstat(fd, &stb) < 0) {
1235                 run_err("fstat: %s", strerror(errno));
1236                 return (0);
1237         }
1238         size = roundup(stb.st_blksize, blksize);
1239         if (size == 0)
1240                 size = blksize;
1241         if (bp->cnt >= size)
1242                 return (bp);
1243         if (bp->buf == NULL)
1244                 bp->buf = xmalloc(size);
1245         else
1246                 bp->buf = xrealloc(bp->buf, 1, size);
1247         memset(bp->buf, 0, size);
1248         bp->cnt = size;
1249         return (bp);
1250 }
1251
1252 void
1253 lostconn(int signo)
1254 {
1255         if (!iamremote)
1256                 write(STDERR_FILENO, "lost connection\n", 16);
1257         if (signo)
1258                 _exit(1);
1259         else
1260                 exit(1);
1261 }