scp.c

   1 /* $OpenBSD: scp.c,v 1.168 2010/11/26 05:52:49 djm 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 /* Struct for addargs */
 124 arglist args;
 125 arglist remote_remote_args;
 126
 127 /* Bandwidth limit */
 128 long long limit_kbps = 0;
 129 struct bwlimit bwlimit;
 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 void
 160 suspchild(int signo)
 161 {
 162         int status;
 163
 164         if (do_cmd_pid > 1) {
 165                 kill(do_cmd_pid, signo);
 166                 while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
 167                     errno == EINTR)
 168                         ;
 169                 kill(getpid(), SIGSTOP);
 170         }
 171 }
 172
 173 static int
 174 do_local_cmd(arglist *a)
 175 {
 176         u_int i;
 177         int status;
 178         pid_t pid;
 179
 180         if (a->num == 0)
 181                 fatal("do_local_cmd: no arguments");
 182
 183         if (verbose_mode) {
 184                 fprintf(stderr, "Executing:");
 185                 for (i = 0; i < a->num; i++)
 186                         fprintf(stderr, " %s", a->list[i]);
 187                 fprintf(stderr, "\n");
 188         }
 189         if ((pid = fork()) == -1)
 190                 fatal("do_local_cmd: fork: %s", strerror(errno));
 191
 192         if (pid == 0) {
 193                 execvp(a->list[0], a->list);
 194                 perror(a->list[0]);
 195                 exit(1);
 196         }
 197
 198         do_cmd_pid = pid;
 199         signal(SIGTERM, killchild);
 200         signal(SIGINT, killchild);
 201         signal(SIGHUP, killchild);
 202
 203         while (waitpid(pid, &status, 0) == -1)
 204                 if (errno != EINTR)
 205                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 206
 207         do_cmd_pid = -1;
 208
 209         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 210                 return (-1);
 211
 212         return (0);
 213 }
 214
 215 /*
 216  * This function executes the given command as the specified user on the
 217  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 218  * assigns the input and output file descriptors on success.
 219  */
 220
 221 int
 222 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 223 {
 224         int pin[2], pout[2], reserved[2];
 225
 226         if (verbose_mode)
 227                 fprintf(stderr,
 228                     "Executing: program %s host %s, user %s, command %s\n",
 229                     ssh_program, host,
 230                     remuser ? remuser : "(unspecified)", cmd);
 231
 232         /*
 233          * Reserve two descriptors so that the real pipes won't get
 234          * descriptors 0 and 1 because that will screw up dup2 below.
 235          */
 236         if (pipe(reserved) < 0)
 237                 fatal("pipe: %s", strerror(errno));
 238
 239         /* Create a socket pair for communicating with ssh. */
 240         if (pipe(pin) < 0)
 241                 fatal("pipe: %s", strerror(errno));
 242         if (pipe(pout) < 0)
 243                 fatal("pipe: %s", strerror(errno));
 244
 245         /* Free the reserved descriptors. */
 246         close(reserved[0]);
 247         close(reserved[1]);
 248
 249         signal(SIGTSTP, suspchild);
 250         signal(SIGTTIN, suspchild);
 251         signal(SIGTTOU, suspchild);
 252
 253         /* Fork a child to execute the command on the remote host using ssh. */
 254         do_cmd_pid = fork();
 255         if (do_cmd_pid == 0) {
 256                 /* Child. */
 257                 close(pin[1]);
 258                 close(pout[0]);
 259                 dup2(pin[0], 0);
 260                 dup2(pout[1], 1);
 261                 close(pin[0]);
 262                 close(pout[1]);
 263
 264                 replacearg(&args, 0, "%s", ssh_program);
 265                 if (remuser != NULL) {
 266                         addargs(&args, "-l");
 267                         addargs(&args, "%s", remuser);
 268                 }
 269                 addargs(&args, "--");
 270                 addargs(&args, "%s", host);
 271                 addargs(&args, "%s", cmd);
 272
 273                 execvp(ssh_program, args.list);
 274                 perror(ssh_program);
 275                 exit(1);
 276         } else if (do_cmd_pid == -1) {
 277                 fatal("fork: %s", strerror(errno));
 278         }
 279         /* Parent.  Close the other side, and return the local side. */
 280         close(pin[0]);
 281         *fdout = pin[1];
 282         close(pout[1]);
 283         *fdin = pout[0];
 284         signal(SIGTERM, killchild);
 285         signal(SIGINT, killchild);
 286         signal(SIGHUP, killchild);
 287         return 0;
 288 }
 289
 290 typedef struct {
 291         size_t cnt;
 292         char *buf;
 293 } BUF;
 294
 295 BUF *allocbuf(BUF *, int, int);
 296 void lostconn(int);
 297 int okname(char *);
 298 void run_err(const char *,...);
 299 void verifydir(char *);
 300
 301 struct passwd *pwd;
 302 uid_t userid;
 303 int errs, remin, remout;
 304 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 305
 306 #define CMDNEEDS        64
 307 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 308
 309 int response(void);
 310 void rsource(char *, struct stat *);
 311 void sink(int, char *[]);
 312 void source(int, char *[]);
 313 void tolocal(int, char *[]);
 314 void toremote(char *, int, char *[]);
 315 void usage(void);
 316
 317 int
 318 main(int argc, char **argv)
 319 {
 320         int ch, fflag, tflag, status, n;
 321         char *targ, **newargv;
 322         const char *errstr;
 323         extern char *optarg;
 324         extern int optind;
 325
 326         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 327         sanitise_stdfd();
 328
 329         /* Copy argv, because we modify it */
 330         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 331         for (n = 0; n < argc; n++)
 332                 newargv[n] = xstrdup(argv[n]);
 333         argv = newargv;
 334
 335         __progname = ssh_get_progname(argv[0]);
 336
 337         memset(&args, '\0', sizeof(args));
 338         memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
 339         args.list = remote_remote_args.list = NULL;
 340         addargs(&args, "%s", ssh_program);
 341         addargs(&args, "-x");
 342         addargs(&args, "-oForwardAgent=no");
 343         addargs(&args, "-oPermitLocalCommand=no");
 344         addargs(&args, "-oClearAllForwardings=yes");
 345
 346         fflag = tflag = 0;
 347         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 348                 switch (ch) {
 349                 /* User-visible flags. */
 350                 case '1':
 351                 case '2':
 352                 case '4':
 353                 case '6':
 354                 case 'C':
 355                         addargs(&args, "-%c", ch);
 356                         addargs(&remote_remote_args, "-%c", ch);
 357                         break;
 358                 case 'o':
 359                 case 'c':
 360                 case 'i':
 361                 case 'F':
 362                         addargs(&remote_remote_args, "-%c", ch);
 363                         addargs(&remote_remote_args, "%s", optarg);
 364                         addargs(&args, "-%c", ch);
 365                         addargs(&args, "%s", optarg);
 366                         break;
 367                 case 'P':
 368                         addargs(&remote_remote_args, "-p");
 369                         addargs(&remote_remote_args, "%s", optarg);
 370                         addargs(&args, "-p");
 371                         addargs(&args, "%s", optarg);
 372                         break;
 373                 case 'B':
 374                         addargs(&remote_remote_args, "-oBatchmode=yes");
 375                         addargs(&args, "-oBatchmode=yes");
 376                         break;
 377                 case 'l':
 378                         limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
 379                             &errstr);
 380                         if (errstr != NULL)
 381                                 usage();
 382                         limit_kbps *= 1024; /* kbps */
 383                         bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
 384                         break;
 385                 case 'p':
 386                         pflag = 1;
 387                         break;
 388                 case 'r':
 389                         iamrecursive = 1;
 390                         break;
 391                 case 'S':
 392                         ssh_program = xstrdup(optarg);
 393                         break;
 394                 case 'v':
 395                         addargs(&args, "-v");
 396                         addargs(&remote_remote_args, "-v");
 397                         verbose_mode = 1;
 398                         break;
 399                 case 'q':
 400                         addargs(&args, "-q");
 401                         addargs(&remote_remote_args, "-q");
 402                         showprogress = 0;
 403                         break;
 404
 405                 /* Server options. */
 406                 case 'd':
 407                         targetshouldbedirectory = 1;
 408                         break;
 409                 case 'f':       /* "from" */
 410                         iamremote = 1;
 411                         fflag = 1;
 412                         break;
 413                 case 't':       /* "to" */
 414                         iamremote = 1;
 415                         tflag = 1;
 416 #ifdef HAVE_CYGWIN
 417                         setmode(0, O_BINARY);
 418 #endif
 419                         break;
 420                 default:
 421                         usage();
 422                 }
 423         argc -= optind;
 424         argv += optind;
 425
 426         if ((pwd = getpwuid(userid = getuid())) == NULL)
 427                 fatal("unknown user %u", (u_int) userid);
 428
 429         if (!isatty(STDOUT_FILENO))
 430                 showprogress = 0;
 431
 432         remin = STDIN_FILENO;
 433         remout = STDOUT_FILENO;
 434
 435         if (fflag) {
 436                 /* Follow "protocol", send data. */
 437                 (void) response();
 438                 source(argc, argv);
 439                 exit(errs != 0);
 440         }
 441         if (tflag) {
 442                 /* Receive data. */
 443                 sink(argc, argv);
 444                 exit(errs != 0);
 445         }
 446         if (argc < 2)
 447                 usage();
 448         if (argc > 2)
 449                 targetshouldbedirectory = 1;
 450
 451         remin = remout = -1;
 452         do_cmd_pid = -1;
 453         /* Command to be executed on remote system using "ssh". */
 454         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 455             verbose_mode ? " -v" : "",
 456             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 457             targetshouldbedirectory ? " -d" : "");
 458
 459         (void) signal(SIGPIPE, lostconn);
 460
 461         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 462                 toremote(targ, argc, argv);
 463         else {
 464                 if (targetshouldbedirectory)
 465                         verifydir(argv[argc - 1]);
 466                 tolocal(argc, argv);    /* Dest is local host. */
 467         }
 468         /*
 469          * Finally check the exit status of the ssh process, if one was forked
 470          * and no error has occurred yet
 471          */
 472         if (do_cmd_pid != -1 && errs == 0) {
 473                 if (remin != -1)
 474                     (void) close(remin);
 475                 if (remout != -1)
 476                     (void) close(remout);
 477                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 478                         errs = 1;
 479                 else {
 480                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 481                                 errs = 1;
 482                 }
 483         }
 484         exit(errs != 0);
 485 }
 486
 487 /* Callback from atomicio6 to update progress meter and limit bandwidth */
 488 static int
 489 scpio(void *_cnt, size_t s)
 490 {
 491         off_t *cnt = (off_t *)_cnt;
 492
 493         *cnt += s;
 494         if (limit_kbps > 0)
 495                 bandwidth_limit(&bwlimit, s);
 496         return 0;
 497 }
 498
 499 void
 500 toremote(char *targ, int argc, char **argv)
 501 {
 502         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 503         arglist alist;
 504         int i;
 505         u_int j;
 506
 507         memset(&alist, '\0', sizeof(alist));
 508         alist.list = NULL;
 509
 510         *targ++ = 0;
 511         if (*targ == 0)
 512                 targ = ".";
 513
 514         arg = xstrdup(argv[argc - 1]);
 515         if ((thost = strrchr(arg, '@'))) {
 516                 /* user@host */
 517                 *thost++ = 0;
 518                 tuser = arg;
 519                 if (*tuser == '\0')
 520                         tuser = NULL;
 521         } else {
 522                 thost = arg;
 523                 tuser = NULL;
 524         }
 525
 526         if (tuser != NULL && !okname(tuser)) {
 527                 xfree(arg);
 528                 return;
 529         }
 530
 531         for (i = 0; i < argc - 1; i++) {
 532                 src = colon(argv[i]);
 533                 if (src) {      /* remote to remote */
 534                         freeargs(&alist);
 535                         addargs(&alist, "%s", ssh_program);
 536                         addargs(&alist, "-x");
 537                         addargs(&alist, "-oClearAllForwardings=yes");
 538                         addargs(&alist, "-n");
 539                         for (j = 0; j < remote_remote_args.num; j++) {
 540                                 addargs(&alist, "%s",
 541                                     remote_remote_args.list[j]);
 542                         }
 543                         *src++ = 0;
 544                         if (*src == 0)
 545                                 src = ".";
 546                         host = strrchr(argv[i], '@');
 547
 548                         if (host) {
 549                                 *host++ = 0;
 550                                 host = cleanhostname(host);
 551                                 suser = argv[i];
 552                                 if (*suser == '\0')
 553                                         suser = pwd->pw_name;
 554                                 else if (!okname(suser))
 555                                         continue;
 556                                 addargs(&alist, "-l");
 557                                 addargs(&alist, "%s", suser);
 558                         } else {
 559                                 host = cleanhostname(argv[i]);
 560                         }
 561                         addargs(&alist, "--");
 562                         addargs(&alist, "%s", host);
 563                         addargs(&alist, "%s", cmd);
 564                         addargs(&alist, "%s", src);
 565                         addargs(&alist, "%s%s%s:%s",
 566                             tuser ? tuser : "", tuser ? "@" : "",
 567                             thost, targ);
 568                         if (do_local_cmd(&alist) != 0)
 569                                 errs = 1;
 570                 } else {        /* local to remote */
 571                         if (remin == -1) {
 572                                 xasprintf(&bp, "%s -t -- %s", cmd, targ);
 573                                 host = cleanhostname(thost);
 574                                 if (do_cmd(host, tuser, bp, &remin,
 575                                     &remout) < 0)
 576                                         exit(1);
 577                                 if (response() < 0)
 578                                         exit(1);
 579                                 (void) xfree(bp);
 580                         }
 581                         source(1, argv + i);
 582                 }
 583         }
 584         xfree(arg);
 585 }
 586
 587 void
 588 tolocal(int argc, char **argv)
 589 {
 590         char *bp, *host, *src, *suser;
 591         arglist alist;
 592         int i;
 593
 594         memset(&alist, '\0', sizeof(alist));
 595         alist.list = NULL;
 596
 597         for (i = 0; i < argc - 1; i++) {
 598                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 599                         freeargs(&alist);
 600                         addargs(&alist, "%s", _PATH_CP);
 601                         if (iamrecursive)
 602                                 addargs(&alist, "-r");
 603                         if (pflag)
 604                                 addargs(&alist, "-p");
 605                         addargs(&alist, "--");
 606                         addargs(&alist, "%s", argv[i]);
 607                         addargs(&alist, "%s", argv[argc-1]);
 608                         if (do_local_cmd(&alist))
 609                                 ++errs;
 610                         continue;
 611                 }
 612                 *src++ = 0;
 613                 if (*src == 0)
 614                         src = ".";
 615                 if ((host = strrchr(argv[i], '@')) == NULL) {
 616                         host = argv[i];
 617                         suser = NULL;
 618                 } else {
 619                         *host++ = 0;
 620                         suser = argv[i];
 621                         if (*suser == '\0')
 622                                 suser = pwd->pw_name;
 623                 }
 624                 host = cleanhostname(host);
 625                 xasprintf(&bp, "%s -f -- %s", cmd, src);
 626                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 627                         (void) xfree(bp);
 628                         ++errs;
 629                         continue;
 630                 }
 631                 xfree(bp);
 632                 sink(1, argv + argc - 1);
 633                 (void) close(remin);
 634                 remin = remout = -1;
 635         }
 636 }
 637
 638 void
 639 source(int argc, char **argv)
 640 {
 641         struct stat stb;
 642         static BUF buffer;
 643         BUF *bp;
 644         off_t i, statbytes;
 645         size_t amt;
 646         int fd = -1, haderr, indx;
 647         char *last, *name, buf[2048], encname[MAXPATHLEN];
 648         int len;
 649
 650         for (indx = 0; indx < argc; ++indx) {
 651                 name = argv[indx];
 652                 statbytes = 0;
 653                 len = strlen(name);
 654                 while (len > 1 && name[len-1] == '/')
 655                         name[--len] = '\0';
 656                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 657                         goto syserr;
 658                 if (strchr(name, '\n') != NULL) {
 659                         strnvis(encname, name, sizeof(encname), VIS_NL);
 660                         name = encname;
 661                 }
 662                 if (fstat(fd, &stb) < 0) {
 663 syserr:                 run_err("%s: %s", name, strerror(errno));
 664                         goto next;
 665                 }
 666                 if (stb.st_size < 0) {
 667                         run_err("%s: %s", name, "Negative file size");
 668                         goto next;
 669                 }
 670                 unset_nonblock(fd);
 671                 switch (stb.st_mode & S_IFMT) {
 672                 case S_IFREG:
 673                         break;
 674                 case S_IFDIR:
 675                         if (iamrecursive) {
 676                                 rsource(name, &stb);
 677                                 goto next;
 678                         }
 679                         /* FALLTHROUGH */
 680                 default:
 681                         run_err("%s: not a regular file", name);
 682                         goto next;
 683                 }
 684                 if ((last = strrchr(name, '/')) == NULL)
 685                         last = name;
 686                 else
 687                         ++last;
 688                 curfile = last;
 689                 if (pflag) {
 690                         /*
 691                          * Make it compatible with possible future
 692                          * versions expecting microseconds.
 693                          */
 694                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 695                             (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime),
 696                             (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime));
 697                         if (verbose_mode) {
 698                                 fprintf(stderr, "File mtime %ld atime %ld\n",
 699                                     (long)stb.st_mtime, (long)stb.st_atime);
 700                                 fprintf(stderr, "Sending file timestamps: %s",
 701                                     buf);
 702                         }
 703                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 704                         if (response() < 0)
 705                                 goto next;
 706                 }
 707 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 708                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 709                     (u_int) (stb.st_mode & FILEMODEMASK),
 710                     (long long)stb.st_size, last);
 711                 if (verbose_mode) {
 712                         fprintf(stderr, "Sending file modes: %s", buf);
 713                 }
 714                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 715                 if (response() < 0)
 716                         goto next;
 717                 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
 718 next:                   if (fd != -1) {
 719                                 (void) close(fd);
 720                                 fd = -1;
 721                         }
 722                         continue;
 723                 }
 724                 if (showprogress)
 725                         start_progress_meter(curfile, stb.st_size, &statbytes);
 726                 set_nonblock(remout);
 727                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 728                         amt = bp->cnt;
 729                         if (i + (off_t)amt > stb.st_size)
 730                                 amt = stb.st_size - i;
 731                         if (!haderr) {
 732                                 if (atomicio(read, fd, bp->buf, amt) != amt)
 733                                         haderr = errno;
 734                         }
 735                         /* Keep writing after error to retain sync */
 736                         if (haderr) {
 737                                 (void)atomicio(vwrite, remout, bp->buf, amt);
 738                                 continue;
 739                         }
 740                         if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
 741                             &statbytes) != amt)
 742                                 haderr = errno;
 743                 }
 744                 unset_nonblock(remout);
 745                 if (showprogress)
 746                         stop_progress_meter();
 747
 748                 if (fd != -1) {
 749                         if (close(fd) < 0 && !haderr)
 750                                 haderr = errno;
 751                         fd = -1;
 752                 }
 753                 if (!haderr)
 754                         (void) atomicio(vwrite, remout, "", 1);
 755                 else
 756                         run_err("%s: %s", name, strerror(haderr));
 757                 (void) response();
 758         }
 759 }
 760
 761 void
 762 rsource(char *name, struct stat *statp)
 763 {
 764         DIR *dirp;
 765         struct dirent *dp;
 766         char *last, *vect[1], path[1100];
 767
 768         if (!(dirp = opendir(name))) {
 769                 run_err("%s: %s", name, strerror(errno));
 770                 return;
 771         }
 772         last = strrchr(name, '/');
 773         if (last == 0)
 774                 last = name;
 775         else
 776                 last++;
 777         if (pflag) {
 778                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 779                     (u_long) statp->st_mtime,
 780                     (u_long) statp->st_atime);
 781                 (void) atomicio(vwrite, remout, path, strlen(path));
 782                 if (response() < 0) {
 783                         closedir(dirp);
 784                         return;
 785                 }
 786         }
 787         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 788             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 789         if (verbose_mode)
 790                 fprintf(stderr, "Entering directory: %s", path);
 791         (void) atomicio(vwrite, remout, path, strlen(path));
 792         if (response() < 0) {
 793                 closedir(dirp);
 794                 return;
 795         }
 796         while ((dp = readdir(dirp)) != NULL) {
 797                 if (dp->d_ino == 0)
 798                         continue;
 799                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 800                         continue;
 801                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 802                         run_err("%s/%s: name too long", name, dp->d_name);
 803                         continue;
 804                 }
 805                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 806                 vect[0] = path;
 807                 source(1, vect);
 808         }
 809         (void) closedir(dirp);
 810         (void) atomicio(vwrite, remout, "E\n", 2);
 811         (void) response();
 812 }
 813
 814 void
 815 sink(int argc, char **argv)
 816 {
 817         static BUF buffer;
 818         struct stat stb;
 819         enum {
 820                 YES, NO, DISPLAYED
 821         } wrerr;
 822         BUF *bp;
 823         off_t i;
 824         size_t j, count;
 825         int amt, exists, first, ofd;
 826         mode_t mode, omode, mask;
 827         off_t size, statbytes;
 828         int setimes, targisdir, wrerrno = 0;
 829         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 830         struct timeval tv[2];
 831
 832 #define atime   tv[0]
 833 #define mtime   tv[1]
 834 #define SCREWUP(str)    { why = str; goto screwup; }
 835
 836         setimes = targisdir = 0;
 837         mask = umask(0);
 838         if (!pflag)
 839                 (void) umask(mask);
 840         if (argc != 1) {
 841                 run_err("ambiguous target");
 842                 exit(1);
 843         }
 844         targ = *argv;
 845         if (targetshouldbedirectory)
 846                 verifydir(targ);
 847
 848         (void) atomicio(vwrite, remout, "", 1);
 849         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 850                 targisdir = 1;
 851         for (first = 1;; first = 0) {
 852                 cp = buf;
 853                 if (atomicio(read, remin, cp, 1) != 1)
 854                         return;
 855                 if (*cp++ == '\n')
 856                         SCREWUP("unexpected <newline>");
 857                 do {
 858                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 859                                 SCREWUP("lost connection");
 860                         *cp++ = ch;
 861                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 862                 *cp = 0;
 863                 if (verbose_mode)
 864                         fprintf(stderr, "Sink: %s", buf);
 865
 866                 if (buf[0] == '\01' || buf[0] == '\02') {
 867                         if (iamremote == 0)
 868                                 (void) atomicio(vwrite, STDERR_FILENO,
 869                                     buf + 1, strlen(buf + 1));
 870                         if (buf[0] == '\02')
 871                                 exit(1);
 872                         ++errs;
 873                         continue;
 874                 }
 875                 if (buf[0] == 'E') {
 876                         (void) atomicio(vwrite, remout, "", 1);
 877                         return;
 878                 }
 879                 if (ch == '\n')
 880                         *--cp = 0;
 881
 882                 cp = buf;
 883                 if (*cp == 'T') {
 884                         setimes++;
 885                         cp++;
 886                         mtime.tv_sec = strtol(cp, &cp, 10);
 887                         if (!cp || *cp++ != ' ')
 888                                 SCREWUP("mtime.sec not delimited");
 889                         mtime.tv_usec = strtol(cp, &cp, 10);
 890                         if (!cp || *cp++ != ' ')
 891                                 SCREWUP("mtime.usec not delimited");
 892                         atime.tv_sec = strtol(cp, &cp, 10);
 893                         if (!cp || *cp++ != ' ')
 894                                 SCREWUP("atime.sec not delimited");
 895                         atime.tv_usec = strtol(cp, &cp, 10);
 896                         if (!cp || *cp++ != '\0')
 897                                 SCREWUP("atime.usec not delimited");
 898                         (void) atomicio(vwrite, remout, "", 1);
 899                         continue;
 900                 }
 901                 if (*cp != 'C' && *cp != 'D') {
 902                         /*
 903                          * Check for the case "rcp remote:foo\* local:bar".
 904                          * In this case, the line "No match." can be returned
 905                          * by the shell before the rcp command on the remote is
 906                          * executed so the ^Aerror_message convention isn't
 907                          * followed.
 908                          */
 909                         if (first) {
 910                                 run_err("%s", cp);
 911                                 exit(1);
 912                         }
 913                         SCREWUP("expected control record");
 914                 }
 915                 mode = 0;
 916                 for (++cp; cp < buf + 5; cp++) {
 917                         if (*cp < '0' || *cp > '7')
 918                                 SCREWUP("bad mode");
 919                         mode = (mode << 3) | (*cp - '0');
 920                 }
 921                 if (*cp++ != ' ')
 922                         SCREWUP("mode not delimited");
 923
 924                 for (size = 0; isdigit(*cp);)
 925                         size = size * 10 + (*cp++ - '0');
 926                 if (*cp++ != ' ')
 927                         SCREWUP("size not delimited");
 928                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 929                         run_err("error: unexpected filename: %s", cp);
 930                         exit(1);
 931                 }
 932                 if (targisdir) {
 933                         static char *namebuf;
 934                         static size_t cursize;
 935                         size_t need;
 936
 937                         need = strlen(targ) + strlen(cp) + 250;
 938                         if (need > cursize) {
 939                                 if (namebuf)
 940                                         xfree(namebuf);
 941                                 namebuf = xmalloc(need);
 942                                 cursize = need;
 943                         }
 944                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 945                             strcmp(targ, "/") ? "/" : "", cp);
 946                         np = namebuf;
 947                 } else
 948                         np = targ;
 949                 curfile = cp;
 950                 exists = stat(np, &stb) == 0;
 951                 if (buf[0] == 'D') {
 952                         int mod_flag = pflag;
 953                         if (!iamrecursive)
 954                                 SCREWUP("received directory without -r");
 955                         if (exists) {
 956                                 if (!S_ISDIR(stb.st_mode)) {
 957                                         errno = ENOTDIR;
 958                                         goto bad;
 959                                 }
 960                                 if (pflag)
 961                                         (void) chmod(np, mode);
 962                         } else {
 963                                 /* Handle copying from a read-only
 964                                    directory */
 965                                 mod_flag = 1;
 966                                 if (mkdir(np, mode | S_IRWXU) < 0)
 967                                         goto bad;
 968                         }
 969                         vect[0] = xstrdup(np);
 970                         sink(1, vect);
 971                         if (setimes) {
 972                                 setimes = 0;
 973                                 if (utimes(vect[0], tv) < 0)
 974                                         run_err("%s: set times: %s",
 975                                             vect[0], strerror(errno));
 976                         }
 977                         if (mod_flag)
 978                                 (void) chmod(vect[0], mode);
 979                         if (vect[0])
 980                                 xfree(vect[0]);
 981                         continue;
 982                 }
 983                 omode = mode;
 984                 mode |= S_IWRITE;
 985                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 986 bad:                    run_err("%s: %s", np, strerror(errno));
 987                         continue;
 988                 }
 989                 (void) atomicio(vwrite, remout, "", 1);
 990                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
 991                         (void) close(ofd);
 992                         continue;
 993                 }
 994                 cp = bp->buf;
 995                 wrerr = NO;
 996
 997                 statbytes = 0;
 998                 if (showprogress)
 999                         start_progress_meter(curfile, size, &statbytes);
1000                 set_nonblock(remin);
1001                 for (count = i = 0; i < size; i += bp->cnt) {
1002                         amt = bp->cnt;
1003                         if (i + amt > size)
1004                                 amt = size - i;
1005                         count += amt;
1006                         do {
1007                                 j = atomicio6(read, remin, cp, amt,
1008                                     scpio, &statbytes);
1009                                 if (j == 0) {
1010                                         run_err("%s", j != EPIPE ?
1011                                             strerror(errno) :
1012                                             "dropped connection");
1013                                         exit(1);
1014                                 }
1015                                 amt -= j;
1016                                 cp += j;
1017                         } while (amt > 0);
1018
1019                         if (count == bp->cnt) {
1020                                 /* Keep reading so we stay sync'd up. */
1021                                 if (wrerr == NO) {
1022                                         if (atomicio(vwrite, ofd, bp->buf,
1023                                             count) != count) {
1024                                                 wrerr = YES;
1025                                                 wrerrno = errno;
1026                                         }
1027                                 }
1028                                 count = 0;
1029                                 cp = bp->buf;
1030                         }
1031                 }
1032                 unset_nonblock(remin);
1033                 if (showprogress)
1034                         stop_progress_meter();
1035                 if (count != 0 && wrerr == NO &&
1036                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1037                         wrerr = YES;
1038                         wrerrno = errno;
1039                 }
1040                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1041                     ftruncate(ofd, size) != 0) {
1042                         run_err("%s: truncate: %s", np, strerror(errno));
1043                         wrerr = DISPLAYED;
1044                 }
1045                 if (pflag) {
1046                         if (exists || omode != mode)
1047 #ifdef HAVE_FCHMOD
1048                                 if (fchmod(ofd, omode)) {
1049 #else /* HAVE_FCHMOD */
1050                                 if (chmod(np, omode)) {
1051 #endif /* HAVE_FCHMOD */
1052                                         run_err("%s: set mode: %s",
1053                                             np, strerror(errno));
1054                                         wrerr = DISPLAYED;
1055                                 }
1056                 } else {
1057                         if (!exists && omode != mode)
1058 #ifdef HAVE_FCHMOD
1059                                 if (fchmod(ofd, omode & ~mask)) {
1060 #else /* HAVE_FCHMOD */
1061                                 if (chmod(np, omode & ~mask)) {
1062 #endif /* HAVE_FCHMOD */
1063                                         run_err("%s: set mode: %s",
1064                                             np, strerror(errno));
1065                                         wrerr = DISPLAYED;
1066                                 }
1067                 }
1068                 if (close(ofd) == -1) {
1069                         wrerr = YES;
1070                         wrerrno = errno;
1071                 }
1072                 (void) response();
1073                 if (setimes && wrerr == NO) {
1074                         setimes = 0;
1075                         if (utimes(np, tv) < 0) {
1076                                 run_err("%s: set times: %s",
1077                                     np, strerror(errno));
1078                                 wrerr = DISPLAYED;
1079                         }
1080                 }
1081                 switch (wrerr) {
1082                 case YES:
1083                         run_err("%s: %s", np, strerror(wrerrno));
1084                         break;
1085                 case NO:
1086                         (void) atomicio(vwrite, remout, "", 1);
1087                         break;
1088                 case DISPLAYED:
1089                         break;
1090                 }
1091         }
1092 screwup:
1093         run_err("protocol error: %s", why);
1094         exit(1);
1095 }
1096
1097 int
1098 response(void)
1099 {
1100         char ch, *cp, resp, rbuf[2048];
1101
1102         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1103                 lostconn(0);
1104
1105         cp = rbuf;
1106         switch (resp) {
1107         case 0:         /* ok */
1108                 return (0);
1109         default:
1110                 *cp++ = resp;
1111                 /* FALLTHROUGH */
1112         case 1:         /* error, followed by error msg */
1113         case 2:         /* fatal error, "" */
1114                 do {
1115                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1116                                 lostconn(0);
1117                         *cp++ = ch;
1118                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1119
1120                 if (!iamremote)
1121                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1122                 ++errs;
1123                 if (resp == 1)
1124                         return (-1);
1125                 exit(1);
1126         }
1127         /* NOTREACHED */
1128 }
1129
1130 void
1131 usage(void)
1132 {
1133         (void) fprintf(stderr,
1134             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1135             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1136             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1137         exit(1);
1138 }
1139
1140 void
1141 run_err(const char *fmt,...)
1142 {
1143         static FILE *fp;
1144         va_list ap;
1145
1146         ++errs;
1147         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1148                 (void) fprintf(fp, "%c", 0x01);
1149                 (void) fprintf(fp, "scp: ");
1150                 va_start(ap, fmt);
1151                 (void) vfprintf(fp, fmt, ap);
1152                 va_end(ap);
1153                 (void) fprintf(fp, "\n");
1154                 (void) fflush(fp);
1155         }
1156
1157         if (!iamremote) {
1158                 va_start(ap, fmt);
1159                 vfprintf(stderr, fmt, ap);
1160                 va_end(ap);
1161                 fprintf(stderr, "\n");
1162         }
1163 }
1164
1165 void
1166 verifydir(char *cp)
1167 {
1168         struct stat stb;
1169
1170         if (!stat(cp, &stb)) {
1171                 if (S_ISDIR(stb.st_mode))
1172                         return;
1173                 errno = ENOTDIR;
1174         }
1175         run_err("%s: %s", cp, strerror(errno));
1176         killchild(0);
1177 }
1178
1179 int
1180 okname(char *cp0)
1181 {
1182         int c;
1183         char *cp;
1184
1185         cp = cp0;
1186         do {
1187                 c = (int)*cp;
1188                 if (c & 0200)
1189                         goto bad;
1190                 if (!isalpha(c) && !isdigit(c)) {
1191                         switch (c) {
1192                         case '\'':
1193                         case '"':
1194                         case '`':
1195                         case ' ':
1196                         case '#':
1197                                 goto bad;
1198                         default:
1199                                 break;
1200                         }
1201                 }
1202         } while (*++cp);
1203         return (1);
1204
1205 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1206         return (0);
1207 }
1208
1209 BUF *
1210 allocbuf(BUF *bp, int fd, int blksize)
1211 {
1212         size_t size;
1213 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1214         struct stat stb;
1215
1216         if (fstat(fd, &stb) < 0) {
1217                 run_err("fstat: %s", strerror(errno));
1218                 return (0);
1219         }
1220         size = roundup(stb.st_blksize, blksize);
1221         if (size == 0)
1222                 size = blksize;
1223 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1224         size = blksize;
1225 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1226         if (bp->cnt >= size)
1227                 return (bp);
1228         if (bp->buf == NULL)
1229                 bp->buf = xmalloc(size);
1230         else
1231                 bp->buf = xrealloc(bp->buf, 1, size);
1232         memset(bp->buf, 0, size);
1233         bp->cnt = size;
1234         return (bp);
1235 }
1236
1237 void
1238 lostconn(int signo)
1239 {
1240         if (!iamremote)
1241                 write(STDERR_FILENO, "lost connection\n", 16);
1242         if (signo)
1243                 _exit(1);
1244         else
1245                 exit(1);
1246 }