scp.c

   1 /* $OpenBSD: scp.c,v 1.167 2010/09/22 22:58:51 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
 126 /* Bandwidth limit */
 127 long long limit_kbps = 0;
 128 struct bwlimit bwlimit;
 129
 130 /* Name of current file being transferred. */
 131 char *curfile;
 132
 133 /* This is set to non-zero to enable verbose mode. */
 134 int verbose_mode = 0;
 135
 136 /* This is set to zero if the progressmeter is not desired. */
 137 int showprogress = 1;
 138
 139 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 140 char *ssh_program = _PATH_SSH_PROGRAM;
 141
 142 /* This is used to store the pid of ssh_program */
 143 pid_t do_cmd_pid = -1;
 144
 145 static void
 146 killchild(int signo)
 147 {
 148         if (do_cmd_pid > 1) {
 149                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 150                 waitpid(do_cmd_pid, NULL, 0);
 151         }
 152
 153         if (signo)
 154                 _exit(1);
 155         exit(1);
 156 }
 157
 158 static void
 159 suspchild(int signo)
 160 {
 161         int status;
 162
 163         if (do_cmd_pid > 1) {
 164                 kill(do_cmd_pid, signo);
 165                 while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 &&
 166                     errno == EINTR)
 167                         ;
 168                 kill(getpid(), SIGSTOP);
 169         }
 170 }
 171
 172 static int
 173 do_local_cmd(arglist *a)
 174 {
 175         u_int i;
 176         int status;
 177         pid_t pid;
 178
 179         if (a->num == 0)
 180                 fatal("do_local_cmd: no arguments");
 181
 182         if (verbose_mode) {
 183                 fprintf(stderr, "Executing:");
 184                 for (i = 0; i < a->num; i++)
 185                         fprintf(stderr, " %s", a->list[i]);
 186                 fprintf(stderr, "\n");
 187         }
 188         if ((pid = fork()) == -1)
 189                 fatal("do_local_cmd: fork: %s", strerror(errno));
 190
 191         if (pid == 0) {
 192                 execvp(a->list[0], a->list);
 193                 perror(a->list[0]);
 194                 exit(1);
 195         }
 196
 197         do_cmd_pid = pid;
 198         signal(SIGTERM, killchild);
 199         signal(SIGINT, killchild);
 200         signal(SIGHUP, killchild);
 201
 202         while (waitpid(pid, &status, 0) == -1)
 203                 if (errno != EINTR)
 204                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 205
 206         do_cmd_pid = -1;
 207
 208         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 209                 return (-1);
 210
 211         return (0);
 212 }
 213
 214 /*
 215  * This function executes the given command as the specified user on the
 216  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 217  * assigns the input and output file descriptors on success.
 218  */
 219
 220 int
 221 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 222 {
 223         int pin[2], pout[2], reserved[2];
 224
 225         if (verbose_mode)
 226                 fprintf(stderr,
 227                     "Executing: program %s host %s, user %s, command %s\n",
 228                     ssh_program, host,
 229                     remuser ? remuser : "(unspecified)", cmd);
 230
 231         /*
 232          * Reserve two descriptors so that the real pipes won't get
 233          * descriptors 0 and 1 because that will screw up dup2 below.
 234          */
 235         if (pipe(reserved) < 0)
 236                 fatal("pipe: %s", strerror(errno));
 237
 238         /* Create a socket pair for communicating with ssh. */
 239         if (pipe(pin) < 0)
 240                 fatal("pipe: %s", strerror(errno));
 241         if (pipe(pout) < 0)
 242                 fatal("pipe: %s", strerror(errno));
 243
 244         /* Free the reserved descriptors. */
 245         close(reserved[0]);
 246         close(reserved[1]);
 247
 248         signal(SIGTSTP, suspchild);
 249         signal(SIGTTIN, suspchild);
 250         signal(SIGTTOU, suspchild);
 251
 252         /* Fork a child to execute the command on the remote host using ssh. */
 253         do_cmd_pid = fork();
 254         if (do_cmd_pid == 0) {
 255                 /* Child. */
 256                 close(pin[1]);
 257                 close(pout[0]);
 258                 dup2(pin[0], 0);
 259                 dup2(pout[1], 1);
 260                 close(pin[0]);
 261                 close(pout[1]);
 262
 263                 replacearg(&args, 0, "%s", ssh_program);
 264                 if (remuser != NULL) {
 265                         addargs(&args, "-l");
 266                         addargs(&args, "%s", remuser);
 267                 }
 268                 addargs(&args, "--");
 269                 addargs(&args, "%s", host);
 270                 addargs(&args, "%s", cmd);
 271
 272                 execvp(ssh_program, args.list);
 273                 perror(ssh_program);
 274                 exit(1);
 275         } else if (do_cmd_pid == -1) {
 276                 fatal("fork: %s", strerror(errno));
 277         }
 278         /* Parent.  Close the other side, and return the local side. */
 279         close(pin[0]);
 280         *fdout = pin[1];
 281         close(pout[1]);
 282         *fdin = pout[0];
 283         signal(SIGTERM, killchild);
 284         signal(SIGINT, killchild);
 285         signal(SIGHUP, killchild);
 286         return 0;
 287 }
 288
 289 typedef struct {
 290         size_t cnt;
 291         char *buf;
 292 } BUF;
 293
 294 BUF *allocbuf(BUF *, int, int);
 295 void lostconn(int);
 296 int okname(char *);
 297 void run_err(const char *,...);
 298 void verifydir(char *);
 299
 300 struct passwd *pwd;
 301 uid_t userid;
 302 int errs, remin, remout;
 303 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 304
 305 #define CMDNEEDS        64
 306 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 307
 308 int response(void);
 309 void rsource(char *, struct stat *);
 310 void sink(int, char *[]);
 311 void source(int, char *[]);
 312 void tolocal(int, char *[]);
 313 void toremote(char *, int, char *[]);
 314 void usage(void);
 315
 316 int
 317 main(int argc, char **argv)
 318 {
 319         int ch, fflag, tflag, status, n;
 320         char *targ, **newargv;
 321         const char *errstr;
 322         extern char *optarg;
 323         extern int optind;
 324
 325         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 326         sanitise_stdfd();
 327
 328         /* Copy argv, because we modify it */
 329         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 330         for (n = 0; n < argc; n++)
 331                 newargv[n] = xstrdup(argv[n]);
 332         argv = newargv;
 333
 334         __progname = ssh_get_progname(argv[0]);
 335
 336         memset(&args, '\0', sizeof(args));
 337         args.list = NULL;
 338         addargs(&args, "%s", ssh_program);
 339         addargs(&args, "-x");
 340         addargs(&args, "-oForwardAgent no");
 341         addargs(&args, "-oPermitLocalCommand no");
 342         addargs(&args, "-oClearAllForwardings yes");
 343
 344         fflag = tflag = 0;
 345         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 346                 switch (ch) {
 347                 /* User-visible flags. */
 348                 case '1':
 349                 case '2':
 350                 case '4':
 351                 case '6':
 352                 case 'C':
 353                         addargs(&args, "-%c", ch);
 354                         break;
 355                 case 'o':
 356                 case 'c':
 357                 case 'i':
 358                 case 'F':
 359                         addargs(&args, "-%c", ch);
 360                         addargs(&args, "%s", optarg);
 361                         break;
 362                 case 'P':
 363                         addargs(&args, "-p");
 364                         addargs(&args, "%s", optarg);
 365                         break;
 366                 case 'B':
 367                         addargs(&args, "-oBatchmode yes");
 368                         break;
 369                 case 'l':
 370                         limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
 371                             &errstr);
 372                         if (errstr != NULL)
 373                                 usage();
 374                         limit_kbps *= 1024; /* kbps */
 375                         bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
 376                         break;
 377                 case 'p':
 378                         pflag = 1;
 379                         break;
 380                 case 'r':
 381                         iamrecursive = 1;
 382                         break;
 383                 case 'S':
 384                         ssh_program = xstrdup(optarg);
 385                         break;
 386                 case 'v':
 387                         addargs(&args, "-v");
 388                         verbose_mode = 1;
 389                         break;
 390                 case 'q':
 391                         addargs(&args, "-q");
 392                         showprogress = 0;
 393                         break;
 394
 395                 /* Server options. */
 396                 case 'd':
 397                         targetshouldbedirectory = 1;
 398                         break;
 399                 case 'f':       /* "from" */
 400                         iamremote = 1;
 401                         fflag = 1;
 402                         break;
 403                 case 't':       /* "to" */
 404                         iamremote = 1;
 405                         tflag = 1;
 406 #ifdef HAVE_CYGWIN
 407                         setmode(0, O_BINARY);
 408 #endif
 409                         break;
 410                 default:
 411                         usage();
 412                 }
 413         argc -= optind;
 414         argv += optind;
 415
 416         if ((pwd = getpwuid(userid = getuid())) == NULL)
 417                 fatal("unknown user %u", (u_int) userid);
 418
 419         if (!isatty(STDOUT_FILENO))
 420                 showprogress = 0;
 421
 422         remin = STDIN_FILENO;
 423         remout = STDOUT_FILENO;
 424
 425         if (fflag) {
 426                 /* Follow "protocol", send data. */
 427                 (void) response();
 428                 source(argc, argv);
 429                 exit(errs != 0);
 430         }
 431         if (tflag) {
 432                 /* Receive data. */
 433                 sink(argc, argv);
 434                 exit(errs != 0);
 435         }
 436         if (argc < 2)
 437                 usage();
 438         if (argc > 2)
 439                 targetshouldbedirectory = 1;
 440
 441         remin = remout = -1;
 442         do_cmd_pid = -1;
 443         /* Command to be executed on remote system using "ssh". */
 444         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 445             verbose_mode ? " -v" : "",
 446             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 447             targetshouldbedirectory ? " -d" : "");
 448
 449         (void) signal(SIGPIPE, lostconn);
 450
 451         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 452                 toremote(targ, argc, argv);
 453         else {
 454                 if (targetshouldbedirectory)
 455                         verifydir(argv[argc - 1]);
 456                 tolocal(argc, argv);    /* Dest is local host. */
 457         }
 458         /*
 459          * Finally check the exit status of the ssh process, if one was forked
 460          * and no error has occurred yet
 461          */
 462         if (do_cmd_pid != -1 && errs == 0) {
 463                 if (remin != -1)
 464                     (void) close(remin);
 465                 if (remout != -1)
 466                     (void) close(remout);
 467                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 468                         errs = 1;
 469                 else {
 470                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 471                                 errs = 1;
 472                 }
 473         }
 474         exit(errs != 0);
 475 }
 476
 477 /* Callback from atomicio6 to update progress meter and limit bandwidth */
 478 static int
 479 scpio(void *_cnt, size_t s)
 480 {
 481         off_t *cnt = (off_t *)_cnt;
 482
 483         *cnt += s;
 484         if (limit_kbps > 0)
 485                 bandwidth_limit(&bwlimit, s);
 486         return 0;
 487 }
 488
 489 void
 490 toremote(char *targ, int argc, char **argv)
 491 {
 492         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 493         arglist alist;
 494         int i;
 495
 496         memset(&alist, '\0', sizeof(alist));
 497         alist.list = NULL;
 498
 499         *targ++ = 0;
 500         if (*targ == 0)
 501                 targ = ".";
 502
 503         arg = xstrdup(argv[argc - 1]);
 504         if ((thost = strrchr(arg, '@'))) {
 505                 /* user@host */
 506                 *thost++ = 0;
 507                 tuser = arg;
 508                 if (*tuser == '\0')
 509                         tuser = NULL;
 510         } else {
 511                 thost = arg;
 512                 tuser = NULL;
 513         }
 514
 515         if (tuser != NULL && !okname(tuser)) {
 516                 xfree(arg);
 517                 return;
 518         }
 519
 520         for (i = 0; i < argc - 1; i++) {
 521                 src = colon(argv[i]);
 522                 if (src) {      /* remote to remote */
 523                         freeargs(&alist);
 524                         addargs(&alist, "%s", ssh_program);
 525                         if (verbose_mode)
 526                                 addargs(&alist, "-v");
 527                         addargs(&alist, "-x");
 528                         addargs(&alist, "-oClearAllForwardings yes");
 529                         addargs(&alist, "-n");
 530
 531                         *src++ = 0;
 532                         if (*src == 0)
 533                                 src = ".";
 534                         host = strrchr(argv[i], '@');
 535
 536                         if (host) {
 537                                 *host++ = 0;
 538                                 host = cleanhostname(host);
 539                                 suser = argv[i];
 540                                 if (*suser == '\0')
 541                                         suser = pwd->pw_name;
 542                                 else if (!okname(suser))
 543                                         continue;
 544                                 addargs(&alist, "-l");
 545                                 addargs(&alist, "%s", suser);
 546                         } else {
 547                                 host = cleanhostname(argv[i]);
 548                         }
 549                         addargs(&alist, "--");
 550                         addargs(&alist, "%s", host);
 551                         addargs(&alist, "%s", cmd);
 552                         addargs(&alist, "%s", src);
 553                         addargs(&alist, "%s%s%s:%s",
 554                             tuser ? tuser : "", tuser ? "@" : "",
 555                             thost, targ);
 556                         if (do_local_cmd(&alist) != 0)
 557                                 errs = 1;
 558                 } else {        /* local to remote */
 559                         if (remin == -1) {
 560                                 xasprintf(&bp, "%s -t -- %s", cmd, targ);
 561                                 host = cleanhostname(thost);
 562                                 if (do_cmd(host, tuser, bp, &remin,
 563                                     &remout) < 0)
 564                                         exit(1);
 565                                 if (response() < 0)
 566                                         exit(1);
 567                                 (void) xfree(bp);
 568                         }
 569                         source(1, argv + i);
 570                 }
 571         }
 572         xfree(arg);
 573 }
 574
 575 void
 576 tolocal(int argc, char **argv)
 577 {
 578         char *bp, *host, *src, *suser;
 579         arglist alist;
 580         int i;
 581
 582         memset(&alist, '\0', sizeof(alist));
 583         alist.list = NULL;
 584
 585         for (i = 0; i < argc - 1; i++) {
 586                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 587                         freeargs(&alist);
 588                         addargs(&alist, "%s", _PATH_CP);
 589                         if (iamrecursive)
 590                                 addargs(&alist, "-r");
 591                         if (pflag)
 592                                 addargs(&alist, "-p");
 593                         addargs(&alist, "--");
 594                         addargs(&alist, "%s", argv[i]);
 595                         addargs(&alist, "%s", argv[argc-1]);
 596                         if (do_local_cmd(&alist))
 597                                 ++errs;
 598                         continue;
 599                 }
 600                 *src++ = 0;
 601                 if (*src == 0)
 602                         src = ".";
 603                 if ((host = strrchr(argv[i], '@')) == NULL) {
 604                         host = argv[i];
 605                         suser = NULL;
 606                 } else {
 607                         *host++ = 0;
 608                         suser = argv[i];
 609                         if (*suser == '\0')
 610                                 suser = pwd->pw_name;
 611                 }
 612                 host = cleanhostname(host);
 613                 xasprintf(&bp, "%s -f -- %s", cmd, src);
 614                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 615                         (void) xfree(bp);
 616                         ++errs;
 617                         continue;
 618                 }
 619                 xfree(bp);
 620                 sink(1, argv + argc - 1);
 621                 (void) close(remin);
 622                 remin = remout = -1;
 623         }
 624 }
 625
 626 void
 627 source(int argc, char **argv)
 628 {
 629         struct stat stb;
 630         static BUF buffer;
 631         BUF *bp;
 632         off_t i, statbytes;
 633         size_t amt;
 634         int fd = -1, haderr, indx;
 635         char *last, *name, buf[2048], encname[MAXPATHLEN];
 636         int len;
 637
 638         for (indx = 0; indx < argc; ++indx) {
 639                 name = argv[indx];
 640                 statbytes = 0;
 641                 len = strlen(name);
 642                 while (len > 1 && name[len-1] == '/')
 643                         name[--len] = '\0';
 644                 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0)
 645                         goto syserr;
 646                 if (strchr(name, '\n') != NULL) {
 647                         strnvis(encname, name, sizeof(encname), VIS_NL);
 648                         name = encname;
 649                 }
 650                 if (fstat(fd, &stb) < 0) {
 651 syserr:                 run_err("%s: %s", name, strerror(errno));
 652                         goto next;
 653                 }
 654                 if (stb.st_size < 0) {
 655                         run_err("%s: %s", name, "Negative file size");
 656                         goto next;
 657                 }
 658                 unset_nonblock(fd);
 659                 switch (stb.st_mode & S_IFMT) {
 660                 case S_IFREG:
 661                         break;
 662                 case S_IFDIR:
 663                         if (iamrecursive) {
 664                                 rsource(name, &stb);
 665                                 goto next;
 666                         }
 667                         /* FALLTHROUGH */
 668                 default:
 669                         run_err("%s: not a regular file", name);
 670                         goto next;
 671                 }
 672                 if ((last = strrchr(name, '/')) == NULL)
 673                         last = name;
 674                 else
 675                         ++last;
 676                 curfile = last;
 677                 if (pflag) {
 678                         /*
 679                          * Make it compatible with possible future
 680                          * versions expecting microseconds.
 681                          */
 682                         (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
 683                             (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime),
 684                             (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime));
 685                         if (verbose_mode) {
 686                                 fprintf(stderr, "File mtime %ld atime %ld\n",
 687                                     (long)stb.st_mtime, (long)stb.st_atime);
 688                                 fprintf(stderr, "Sending file timestamps: %s",
 689                                     buf);
 690                         }
 691                         (void) atomicio(vwrite, remout, buf, strlen(buf));
 692                         if (response() < 0)
 693                                 goto next;
 694                 }
 695 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 696                 snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 697                     (u_int) (stb.st_mode & FILEMODEMASK),
 698                     (long long)stb.st_size, last);
 699                 if (verbose_mode) {
 700                         fprintf(stderr, "Sending file modes: %s", buf);
 701                 }
 702                 (void) atomicio(vwrite, remout, buf, strlen(buf));
 703                 if (response() < 0)
 704                         goto next;
 705                 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) {
 706 next:                   if (fd != -1) {
 707                                 (void) close(fd);
 708                                 fd = -1;
 709                         }
 710                         continue;
 711                 }
 712                 if (showprogress)
 713                         start_progress_meter(curfile, stb.st_size, &statbytes);
 714                 set_nonblock(remout);
 715                 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
 716                         amt = bp->cnt;
 717                         if (i + (off_t)amt > stb.st_size)
 718                                 amt = stb.st_size - i;
 719                         if (!haderr) {
 720                                 if (atomicio(read, fd, bp->buf, amt) != amt)
 721                                         haderr = errno;
 722                         }
 723                         /* Keep writing after error to retain sync */
 724                         if (haderr) {
 725                                 (void)atomicio(vwrite, remout, bp->buf, amt);
 726                                 continue;
 727                         }
 728                         if (atomicio6(vwrite, remout, bp->buf, amt, scpio,
 729                             &statbytes) != amt)
 730                                 haderr = errno;
 731                 }
 732                 unset_nonblock(remout);
 733                 if (showprogress)
 734                         stop_progress_meter();
 735
 736                 if (fd != -1) {
 737                         if (close(fd) < 0 && !haderr)
 738                                 haderr = errno;
 739                         fd = -1;
 740                 }
 741                 if (!haderr)
 742                         (void) atomicio(vwrite, remout, "", 1);
 743                 else
 744                         run_err("%s: %s", name, strerror(haderr));
 745                 (void) response();
 746         }
 747 }
 748
 749 void
 750 rsource(char *name, struct stat *statp)
 751 {
 752         DIR *dirp;
 753         struct dirent *dp;
 754         char *last, *vect[1], path[1100];
 755
 756         if (!(dirp = opendir(name))) {
 757                 run_err("%s: %s", name, strerror(errno));
 758                 return;
 759         }
 760         last = strrchr(name, '/');
 761         if (last == 0)
 762                 last = name;
 763         else
 764                 last++;
 765         if (pflag) {
 766                 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
 767                     (u_long) statp->st_mtime,
 768                     (u_long) statp->st_atime);
 769                 (void) atomicio(vwrite, remout, path, strlen(path));
 770                 if (response() < 0) {
 771                         closedir(dirp);
 772                         return;
 773                 }
 774         }
 775         (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
 776             (u_int) (statp->st_mode & FILEMODEMASK), 0, last);
 777         if (verbose_mode)
 778                 fprintf(stderr, "Entering directory: %s", path);
 779         (void) atomicio(vwrite, remout, path, strlen(path));
 780         if (response() < 0) {
 781                 closedir(dirp);
 782                 return;
 783         }
 784         while ((dp = readdir(dirp)) != NULL) {
 785                 if (dp->d_ino == 0)
 786                         continue;
 787                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 788                         continue;
 789                 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) {
 790                         run_err("%s/%s: name too long", name, dp->d_name);
 791                         continue;
 792                 }
 793                 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name);
 794                 vect[0] = path;
 795                 source(1, vect);
 796         }
 797         (void) closedir(dirp);
 798         (void) atomicio(vwrite, remout, "E\n", 2);
 799         (void) response();
 800 }
 801
 802 void
 803 sink(int argc, char **argv)
 804 {
 805         static BUF buffer;
 806         struct stat stb;
 807         enum {
 808                 YES, NO, DISPLAYED
 809         } wrerr;
 810         BUF *bp;
 811         off_t i;
 812         size_t j, count;
 813         int amt, exists, first, ofd;
 814         mode_t mode, omode, mask;
 815         off_t size, statbytes;
 816         int setimes, targisdir, wrerrno = 0;
 817         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 818         struct timeval tv[2];
 819
 820 #define atime   tv[0]
 821 #define mtime   tv[1]
 822 #define SCREWUP(str)    { why = str; goto screwup; }
 823
 824         setimes = targisdir = 0;
 825         mask = umask(0);
 826         if (!pflag)
 827                 (void) umask(mask);
 828         if (argc != 1) {
 829                 run_err("ambiguous target");
 830                 exit(1);
 831         }
 832         targ = *argv;
 833         if (targetshouldbedirectory)
 834                 verifydir(targ);
 835
 836         (void) atomicio(vwrite, remout, "", 1);
 837         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 838                 targisdir = 1;
 839         for (first = 1;; first = 0) {
 840                 cp = buf;
 841                 if (atomicio(read, remin, cp, 1) != 1)
 842                         return;
 843                 if (*cp++ == '\n')
 844                         SCREWUP("unexpected <newline>");
 845                 do {
 846                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 847                                 SCREWUP("lost connection");
 848                         *cp++ = ch;
 849                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 850                 *cp = 0;
 851                 if (verbose_mode)
 852                         fprintf(stderr, "Sink: %s", buf);
 853
 854                 if (buf[0] == '\01' || buf[0] == '\02') {
 855                         if (iamremote == 0)
 856                                 (void) atomicio(vwrite, STDERR_FILENO,
 857                                     buf + 1, strlen(buf + 1));
 858                         if (buf[0] == '\02')
 859                                 exit(1);
 860                         ++errs;
 861                         continue;
 862                 }
 863                 if (buf[0] == 'E') {
 864                         (void) atomicio(vwrite, remout, "", 1);
 865                         return;
 866                 }
 867                 if (ch == '\n')
 868                         *--cp = 0;
 869
 870                 cp = buf;
 871                 if (*cp == 'T') {
 872                         setimes++;
 873                         cp++;
 874                         mtime.tv_sec = strtol(cp, &cp, 10);
 875                         if (!cp || *cp++ != ' ')
 876                                 SCREWUP("mtime.sec not delimited");
 877                         mtime.tv_usec = strtol(cp, &cp, 10);
 878                         if (!cp || *cp++ != ' ')
 879                                 SCREWUP("mtime.usec not delimited");
 880                         atime.tv_sec = strtol(cp, &cp, 10);
 881                         if (!cp || *cp++ != ' ')
 882                                 SCREWUP("atime.sec not delimited");
 883                         atime.tv_usec = strtol(cp, &cp, 10);
 884                         if (!cp || *cp++ != '\0')
 885                                 SCREWUP("atime.usec not delimited");
 886                         (void) atomicio(vwrite, remout, "", 1);
 887                         continue;
 888                 }
 889                 if (*cp != 'C' && *cp != 'D') {
 890                         /*
 891                          * Check for the case "rcp remote:foo\* local:bar".
 892                          * In this case, the line "No match." can be returned
 893                          * by the shell before the rcp command on the remote is
 894                          * executed so the ^Aerror_message convention isn't
 895                          * followed.
 896                          */
 897                         if (first) {
 898                                 run_err("%s", cp);
 899                                 exit(1);
 900                         }
 901                         SCREWUP("expected control record");
 902                 }
 903                 mode = 0;
 904                 for (++cp; cp < buf + 5; cp++) {
 905                         if (*cp < '0' || *cp > '7')
 906                                 SCREWUP("bad mode");
 907                         mode = (mode << 3) | (*cp - '0');
 908                 }
 909                 if (*cp++ != ' ')
 910                         SCREWUP("mode not delimited");
 911
 912                 for (size = 0; isdigit(*cp);)
 913                         size = size * 10 + (*cp++ - '0');
 914                 if (*cp++ != ' ')
 915                         SCREWUP("size not delimited");
 916                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 917                         run_err("error: unexpected filename: %s", cp);
 918                         exit(1);
 919                 }
 920                 if (targisdir) {
 921                         static char *namebuf;
 922                         static size_t cursize;
 923                         size_t need;
 924
 925                         need = strlen(targ) + strlen(cp) + 250;
 926                         if (need > cursize) {
 927                                 if (namebuf)
 928                                         xfree(namebuf);
 929                                 namebuf = xmalloc(need);
 930                                 cursize = need;
 931                         }
 932                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 933                             strcmp(targ, "/") ? "/" : "", cp);
 934                         np = namebuf;
 935                 } else
 936                         np = targ;
 937                 curfile = cp;
 938                 exists = stat(np, &stb) == 0;
 939                 if (buf[0] == 'D') {
 940                         int mod_flag = pflag;
 941                         if (!iamrecursive)
 942                                 SCREWUP("received directory without -r");
 943                         if (exists) {
 944                                 if (!S_ISDIR(stb.st_mode)) {
 945                                         errno = ENOTDIR;
 946                                         goto bad;
 947                                 }
 948                                 if (pflag)
 949                                         (void) chmod(np, mode);
 950                         } else {
 951                                 /* Handle copying from a read-only
 952                                    directory */
 953                                 mod_flag = 1;
 954                                 if (mkdir(np, mode | S_IRWXU) < 0)
 955                                         goto bad;
 956                         }
 957                         vect[0] = xstrdup(np);
 958                         sink(1, vect);
 959                         if (setimes) {
 960                                 setimes = 0;
 961                                 if (utimes(vect[0], tv) < 0)
 962                                         run_err("%s: set times: %s",
 963                                             vect[0], strerror(errno));
 964                         }
 965                         if (mod_flag)
 966                                 (void) chmod(vect[0], mode);
 967                         if (vect[0])
 968                                 xfree(vect[0]);
 969                         continue;
 970                 }
 971                 omode = mode;
 972                 mode |= S_IWRITE;
 973                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
 974 bad:                    run_err("%s: %s", np, strerror(errno));
 975                         continue;
 976                 }
 977                 (void) atomicio(vwrite, remout, "", 1);
 978                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
 979                         (void) close(ofd);
 980                         continue;
 981                 }
 982                 cp = bp->buf;
 983                 wrerr = NO;
 984
 985                 statbytes = 0;
 986                 if (showprogress)
 987                         start_progress_meter(curfile, size, &statbytes);
 988                 set_nonblock(remin);
 989                 for (count = i = 0; i < size; i += bp->cnt) {
 990                         amt = bp->cnt;
 991                         if (i + amt > size)
 992                                 amt = size - i;
 993                         count += amt;
 994                         do {
 995                                 j = atomicio6(read, remin, cp, amt,
 996                                     scpio, &statbytes);
 997                                 if (j == 0) {
 998                                         run_err("%s", j != EPIPE ?
 999                                             strerror(errno) :
1000                                             "dropped connection");
1001                                         exit(1);
1002                                 }
1003                                 amt -= j;
1004                                 cp += j;
1005                         } while (amt > 0);
1006
1007                         if (count == bp->cnt) {
1008                                 /* Keep reading so we stay sync'd up. */
1009                                 if (wrerr == NO) {
1010                                         if (atomicio(vwrite, ofd, bp->buf,
1011                                             count) != count) {
1012                                                 wrerr = YES;
1013                                                 wrerrno = errno;
1014                                         }
1015                                 }
1016                                 count = 0;
1017                                 cp = bp->buf;
1018                         }
1019                 }
1020                 unset_nonblock(remin);
1021                 if (showprogress)
1022                         stop_progress_meter();
1023                 if (count != 0 && wrerr == NO &&
1024                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1025                         wrerr = YES;
1026                         wrerrno = errno;
1027                 }
1028                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1029                     ftruncate(ofd, size) != 0) {
1030                         run_err("%s: truncate: %s", np, strerror(errno));
1031                         wrerr = DISPLAYED;
1032                 }
1033                 if (pflag) {
1034                         if (exists || omode != mode)
1035 #ifdef HAVE_FCHMOD
1036                                 if (fchmod(ofd, omode)) {
1037 #else /* HAVE_FCHMOD */
1038                                 if (chmod(np, omode)) {
1039 #endif /* HAVE_FCHMOD */
1040                                         run_err("%s: set mode: %s",
1041                                             np, strerror(errno));
1042                                         wrerr = DISPLAYED;
1043                                 }
1044                 } else {
1045                         if (!exists && omode != mode)
1046 #ifdef HAVE_FCHMOD
1047                                 if (fchmod(ofd, omode & ~mask)) {
1048 #else /* HAVE_FCHMOD */
1049                                 if (chmod(np, omode & ~mask)) {
1050 #endif /* HAVE_FCHMOD */
1051                                         run_err("%s: set mode: %s",
1052                                             np, strerror(errno));
1053                                         wrerr = DISPLAYED;
1054                                 }
1055                 }
1056                 if (close(ofd) == -1) {
1057                         wrerr = YES;
1058                         wrerrno = errno;
1059                 }
1060                 (void) response();
1061                 if (setimes && wrerr == NO) {
1062                         setimes = 0;
1063                         if (utimes(np, tv) < 0) {
1064                                 run_err("%s: set times: %s",
1065                                     np, strerror(errno));
1066                                 wrerr = DISPLAYED;
1067                         }
1068                 }
1069                 switch (wrerr) {
1070                 case YES:
1071                         run_err("%s: %s", np, strerror(wrerrno));
1072                         break;
1073                 case NO:
1074                         (void) atomicio(vwrite, remout, "", 1);
1075                         break;
1076                 case DISPLAYED:
1077                         break;
1078                 }
1079         }
1080 screwup:
1081         run_err("protocol error: %s", why);
1082         exit(1);
1083 }
1084
1085 int
1086 response(void)
1087 {
1088         char ch, *cp, resp, rbuf[2048];
1089
1090         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1091                 lostconn(0);
1092
1093         cp = rbuf;
1094         switch (resp) {
1095         case 0:         /* ok */
1096                 return (0);
1097         default:
1098                 *cp++ = resp;
1099                 /* FALLTHROUGH */
1100         case 1:         /* error, followed by error msg */
1101         case 2:         /* fatal error, "" */
1102                 do {
1103                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1104                                 lostconn(0);
1105                         *cp++ = ch;
1106                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1107
1108                 if (!iamremote)
1109                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1110                 ++errs;
1111                 if (resp == 1)
1112                         return (-1);
1113                 exit(1);
1114         }
1115         /* NOTREACHED */
1116 }
1117
1118 void
1119 usage(void)
1120 {
1121         (void) fprintf(stderr,
1122             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1123             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1124             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1125         exit(1);
1126 }
1127
1128 void
1129 run_err(const char *fmt,...)
1130 {
1131         static FILE *fp;
1132         va_list ap;
1133
1134         ++errs;
1135         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1136                 (void) fprintf(fp, "%c", 0x01);
1137                 (void) fprintf(fp, "scp: ");
1138                 va_start(ap, fmt);
1139                 (void) vfprintf(fp, fmt, ap);
1140                 va_end(ap);
1141                 (void) fprintf(fp, "\n");
1142                 (void) fflush(fp);
1143         }
1144
1145         if (!iamremote) {
1146                 va_start(ap, fmt);
1147                 vfprintf(stderr, fmt, ap);
1148                 va_end(ap);
1149                 fprintf(stderr, "\n");
1150         }
1151 }
1152
1153 void
1154 verifydir(char *cp)
1155 {
1156         struct stat stb;
1157
1158         if (!stat(cp, &stb)) {
1159                 if (S_ISDIR(stb.st_mode))
1160                         return;
1161                 errno = ENOTDIR;
1162         }
1163         run_err("%s: %s", cp, strerror(errno));
1164         killchild(0);
1165 }
1166
1167 int
1168 okname(char *cp0)
1169 {
1170         int c;
1171         char *cp;
1172
1173         cp = cp0;
1174         do {
1175                 c = (int)*cp;
1176                 if (c & 0200)
1177                         goto bad;
1178                 if (!isalpha(c) && !isdigit(c)) {
1179                         switch (c) {
1180                         case '\'':
1181                         case '"':
1182                         case '`':
1183                         case ' ':
1184                         case '#':
1185                                 goto bad;
1186                         default:
1187                                 break;
1188                         }
1189                 }
1190         } while (*++cp);
1191         return (1);
1192
1193 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1194         return (0);
1195 }
1196
1197 BUF *
1198 allocbuf(BUF *bp, int fd, int blksize)
1199 {
1200         size_t size;
1201 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1202         struct stat stb;
1203
1204         if (fstat(fd, &stb) < 0) {
1205                 run_err("fstat: %s", strerror(errno));
1206                 return (0);
1207         }
1208         size = roundup(stb.st_blksize, blksize);
1209         if (size == 0)
1210                 size = blksize;
1211 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1212         size = blksize;
1213 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1214         if (bp->cnt >= size)
1215                 return (bp);
1216         if (bp->buf == NULL)
1217                 bp->buf = xmalloc(size);
1218         else
1219                 bp->buf = xrealloc(bp->buf, 1, size);
1220         memset(bp->buf, 0, size);
1221         bp->cnt = size;
1222         return (bp);
1223 }
1224
1225 void
1226 lostconn(int signo)
1227 {
1228         if (!iamremote)
1229                 write(STDERR_FILENO, "lost connection\n", 16);
1230         if (signo)
1231                 _exit(1);
1232         else
1233                 exit(1);
1234 }