scp.c

   1 /* $OpenBSD: scp.c,v 1.164 2008/10/10 04:55:16 stevesk Exp $ */
   2 /*
   3  * scp - secure remote copy.  This is basically patched BSD rcp which
   4  * uses ssh to do the data transfer (instead of using rcmd).
   5  *
   6  * NOTE: This version should NOT be suid root.  (This uses ssh to
   7  * do the transfer and ssh has the necessary privileges.)
   8  *
   9  * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi>
  10  *
  11  * As far as I am concerned, the code I have written for this software
  12  * can be used freely for any purpose.  Any derived versions of this
  13  * software must be clearly marked as such, and if the derived work is
  14  * incompatible with the protocol description in the RFC file, it must be
  15  * called by a name other than "ssh" or "Secure Shell".
  16  */
  17 /*
  18  * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
  19  * Copyright (c) 1999 Aaron Campbell.  All rights reserved.
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  * 1. Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in the
  28  *    documentation and/or other materials provided with the distribution.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  33  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  39  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 /*
  43  * Parts from:
  44  *
  45  * Copyright (c) 1983, 1990, 1992, 1993, 1995
  46  *      The Regents of the University of California.  All rights reserved.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice, this list of conditions and the following disclaimer.
  53  * 2. Redistributions in binary form must reproduce the above copyright
  54  *    notice, this list of conditions and the following disclaimer in the
  55  *    documentation and/or other materials provided with the distribution.
  56  * 3. Neither the name of the University nor the names of its contributors
  57  *    may be used to endorse or promote products derived from this software
  58  *    without specific prior written permission.
  59  *
  60  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  61  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  63  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  64  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  65  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  66  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  67  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  68  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  69  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  70  * SUCH DAMAGE.
  71  *
  72  */
  73
  74 #include "includes.h"
  75
  76 #include <sys/types.h>
  77 #include <sys/param.h>
  78 #ifdef HAVE_SYS_STAT_H
  79 # include <sys/stat.h>
  80 #endif
  81 #ifdef HAVE_POLL_H
  82 #include <poll.h>
  83 #else
  84 # ifdef HAVE_SYS_POLL_H
  85 #  include <sys/poll.h>
  86 # endif
  87 #endif
  88 #ifdef HAVE_SYS_TIME_H
  89 # include <sys/time.h>
  90 #endif
  91 #include <sys/wait.h>
  92 #include <sys/uio.h>
  93
  94 #include <ctype.h>
  95 #include <dirent.h>
  96 #include <errno.h>
  97 #include <fcntl.h>
  98 #include <pwd.h>
  99 #include <signal.h>
 100 #include <stdarg.h>
 101 #include <stdio.h>
 102 #include <stdlib.h>
 103 #include <string.h>
 104 #include <time.h>
 105 #include <unistd.h>
 106 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H)
 107 #include <vis.h>
 108 #endif
 109
 110 #include "xmalloc.h"
 111 #include "atomicio.h"
 112 #include "pathnames.h"
 113 #include "log.h"
 114 #include "misc.h"
 115 #include "progressmeter.h"
 116
 117 extern char *__progname;
 118
 119 #define COPY_BUFLEN     16384
 120
 121 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
 122
 123 void bwlimit(int);
 124
 125 /* Struct for addargs */
 126 arglist args;
 127
 128 /* Bandwidth limit */
 129 off_t limit_rate = 0;
 130
 131 /* Name of current file being transferred. */
 132 char *curfile;
 133
 134 /* This is set to non-zero to enable verbose mode. */
 135 int verbose_mode = 0;
 136
 137 /* This is set to zero if the progressmeter is not desired. */
 138 int showprogress = 1;
 139
 140 /* This is the program to execute for the secured connection. ("ssh" or -S) */
 141 char *ssh_program = _PATH_SSH_PROGRAM;
 142
 143 /* This is used to store the pid of ssh_program */
 144 pid_t do_cmd_pid = -1;
 145
 146 static void
 147 killchild(int signo)
 148 {
 149         if (do_cmd_pid > 1) {
 150                 kill(do_cmd_pid, signo ? signo : SIGTERM);
 151                 waitpid(do_cmd_pid, NULL, 0);
 152         }
 153
 154         if (signo)
 155                 _exit(1);
 156         exit(1);
 157 }
 158
 159 static int
 160 do_local_cmd(arglist *a)
 161 {
 162         u_int i;
 163         int status;
 164         pid_t pid;
 165
 166         if (a->num == 0)
 167                 fatal("do_local_cmd: no arguments");
 168
 169         if (verbose_mode) {
 170                 fprintf(stderr, "Executing:");
 171                 for (i = 0; i < a->num; i++)
 172                         fprintf(stderr, " %s", a->list[i]);
 173                 fprintf(stderr, "\n");
 174         }
 175         if ((pid = fork()) == -1)
 176                 fatal("do_local_cmd: fork: %s", strerror(errno));
 177
 178         if (pid == 0) {
 179                 execvp(a->list[0], a->list);
 180                 perror(a->list[0]);
 181                 exit(1);
 182         }
 183
 184         do_cmd_pid = pid;
 185         signal(SIGTERM, killchild);
 186         signal(SIGINT, killchild);
 187         signal(SIGHUP, killchild);
 188
 189         while (waitpid(pid, &status, 0) == -1)
 190                 if (errno != EINTR)
 191                         fatal("do_local_cmd: waitpid: %s", strerror(errno));
 192
 193         do_cmd_pid = -1;
 194
 195         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 196                 return (-1);
 197
 198         return (0);
 199 }
 200
 201 /*
 202  * This function executes the given command as the specified user on the
 203  * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 204  * assigns the input and output file descriptors on success.
 205  */
 206
 207 int
 208 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
 209 {
 210         int pin[2], pout[2], reserved[2];
 211
 212         if (verbose_mode)
 213                 fprintf(stderr,
 214                     "Executing: program %s host %s, user %s, command %s\n",
 215                     ssh_program, host,
 216                     remuser ? remuser : "(unspecified)", cmd);
 217
 218         /*
 219          * Reserve two descriptors so that the real pipes won't get
 220          * descriptors 0 and 1 because that will screw up dup2 below.
 221          */
 222         if (pipe(reserved) < 0)
 223                 fatal("pipe: %s", strerror(errno));
 224
 225         /* Create a socket pair for communicating with ssh. */
 226         if (pipe(pin) < 0)
 227                 fatal("pipe: %s", strerror(errno));
 228         if (pipe(pout) < 0)
 229                 fatal("pipe: %s", strerror(errno));
 230
 231         /* Free the reserved descriptors. */
 232         close(reserved[0]);
 233         close(reserved[1]);
 234
 235         /* Fork a child to execute the command on the remote host using ssh. */
 236         do_cmd_pid = fork();
 237         if (do_cmd_pid == 0) {
 238                 /* Child. */
 239                 close(pin[1]);
 240                 close(pout[0]);
 241                 dup2(pin[0], 0);
 242                 dup2(pout[1], 1);
 243                 close(pin[0]);
 244                 close(pout[1]);
 245
 246                 replacearg(&args, 0, "%s", ssh_program);
 247                 if (remuser != NULL)
 248                         addargs(&args, "-l%s", remuser);
 249                 addargs(&args, "%s", host);
 250                 addargs(&args, "%s", cmd);
 251
 252                 execvp(ssh_program, args.list);
 253                 perror(ssh_program);
 254                 exit(1);
 255         } else if (do_cmd_pid == -1) {
 256                 fatal("fork: %s", strerror(errno));
 257         }
 258         /* Parent.  Close the other side, and return the local side. */
 259         close(pin[0]);
 260         *fdout = pin[1];
 261         close(pout[1]);
 262         *fdin = pout[0];
 263         signal(SIGTERM, killchild);
 264         signal(SIGINT, killchild);
 265         signal(SIGHUP, killchild);
 266         return 0;
 267 }
 268
 269 typedef struct {
 270         size_t cnt;
 271         char *buf;
 272 } BUF;
 273
 274 BUF *allocbuf(BUF *, int, int);
 275 void lostconn(int);
 276 int okname(char *);
 277 void run_err(const char *,...);
 278 void verifydir(char *);
 279
 280 struct passwd *pwd;
 281 uid_t userid;
 282 int errs, remin, remout;
 283 int pflag, iamremote, iamrecursive, targetshouldbedirectory;
 284
 285 #define CMDNEEDS        64
 286 char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */
 287
 288 int response(void);
 289 void rsource(char *, struct stat *);
 290 void sink(int, char *[]);
 291 void source(int, char *[]);
 292 void tolocal(int, char *[]);
 293 void toremote(char *, int, char *[]);
 294 size_t scpio(ssize_t (*)(int, void *, size_t), int, void *, size_t, off_t *);
 295 void usage(void);
 296
 297 int
 298 main(int argc, char **argv)
 299 {
 300         int ch, fflag, tflag, status, n;
 301         double speed;
 302         char *targ, *endp, **newargv;
 303         extern char *optarg;
 304         extern int optind;
 305
 306         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 307         sanitise_stdfd();
 308
 309         /* Copy argv, because we modify it */
 310         newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
 311         for (n = 0; n < argc; n++)
 312                 newargv[n] = xstrdup(argv[n]);
 313         argv = newargv;
 314
 315         __progname = ssh_get_progname(argv[0]);
 316
 317         memset(&args, '\0', sizeof(args));
 318         args.list = NULL;
 319         addargs(&args, "%s", ssh_program);
 320         addargs(&args, "-x");
 321         addargs(&args, "-oForwardAgent no");
 322         addargs(&args, "-oPermitLocalCommand no");
 323         addargs(&args, "-oClearAllForwardings yes");
 324
 325         fflag = tflag = 0;
 326         while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1)
 327                 switch (ch) {
 328                 /* User-visible flags. */
 329                 case '1':
 330                 case '2':
 331                 case '4':
 332                 case '6':
 333                 case 'C':
 334                         addargs(&args, "-%c", ch);
 335                         break;
 336                 case 'o':
 337                 case 'c':
 338                 case 'i':
 339                 case 'F':
 340                         addargs(&args, "-%c%s", ch, optarg);
 341                         break;
 342                 case 'P':
 343                         addargs(&args, "-p%s", optarg);
 344                         break;
 345                 case 'B':
 346                         addargs(&args, "-oBatchmode yes");
 347                         break;
 348                 case 'l':
 349                         speed = strtod(optarg, &endp);
 350                         if (speed <= 0 || *endp != '\0')
 351                                 usage();
 352                         limit_rate = speed * 1024;
 353                         break;
 354                 case 'p':
 355                         pflag = 1;
 356                         break;
 357                 case 'r':
 358                         iamrecursive = 1;
 359                         break;
 360                 case 'S':
 361                         ssh_program = xstrdup(optarg);
 362                         break;
 363                 case 'v':
 364                         addargs(&args, "-v");
 365                         verbose_mode = 1;
 366                         break;
 367                 case 'q':
 368                         addargs(&args, "-q");
 369                         showprogress = 0;
 370                         break;
 371
 372                 /* Server options. */
 373                 case 'd':
 374                         targetshouldbedirectory = 1;
 375                         break;
 376                 case 'f':       /* "from" */
 377                         iamremote = 1;
 378                         fflag = 1;
 379                         break;
 380                 case 't':       /* "to" */
 381                         iamremote = 1;
 382                         tflag = 1;
 383 #ifdef HAVE_CYGWIN
 384                         setmode(0, O_BINARY);
 385 #endif
 386                         break;
 387                 default:
 388                         usage();
 389                 }
 390         argc -= optind;
 391         argv += optind;
 392
 393         if ((pwd = getpwuid(userid = getuid())) == NULL)
 394                 fatal("unknown user %u", (u_int) userid);
 395
 396         if (!isatty(STDOUT_FILENO))
 397                 showprogress = 0;
 398
 399         remin = STDIN_FILENO;
 400         remout = STDOUT_FILENO;
 401
 402         if (fflag) {
 403                 /* Follow "protocol", send data. */
 404                 (void) response();
 405                 source(argc, argv);
 406                 exit(errs != 0);
 407         }
 408         if (tflag) {
 409                 /* Receive data. */
 410                 sink(argc, argv);
 411                 exit(errs != 0);
 412         }
 413         if (argc < 2)
 414                 usage();
 415         if (argc > 2)
 416                 targetshouldbedirectory = 1;
 417
 418         remin = remout = -1;
 419         do_cmd_pid = -1;
 420         /* Command to be executed on remote system using "ssh". */
 421         (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
 422             verbose_mode ? " -v" : "",
 423             iamrecursive ? " -r" : "", pflag ? " -p" : "",
 424             targetshouldbedirectory ? " -d" : "");
 425
 426         (void) signal(SIGPIPE, lostconn);
 427
 428         if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
 429                 toremote(targ, argc, argv);
 430         else {
 431                 if (targetshouldbedirectory)
 432                         verifydir(argv[argc - 1]);
 433                 tolocal(argc, argv);    /* Dest is local host. */
 434         }
 435         /*
 436          * Finally check the exit status of the ssh process, if one was forked
 437          * and no error has occurred yet
 438          */
 439         if (do_cmd_pid != -1 && errs == 0) {
 440                 if (remin != -1)
 441                     (void) close(remin);
 442                 if (remout != -1)
 443                     (void) close(remout);
 444                 if (waitpid(do_cmd_pid, &status, 0) == -1)
 445                         errs = 1;
 446                 else {
 447                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 448                                 errs = 1;
 449                 }
 450         }
 451         exit(errs != 0);
 452 }
 453
 454 /*
 455  * atomicio-like wrapper that also applies bandwidth limits and updates
 456  * the progressmeter counter.
 457  */
 458 size_t
 459 scpio(ssize_t (*f)(int, void *, size_t), int fd, void *_p, size_t l, off_t *c)
 460 {
 461         u_char *p = (u_char *)_p;
 462         size_t offset;
 463         ssize_t r;
 464         struct pollfd pfd;
 465
 466         pfd.fd = fd;
 467         pfd.events = f == read ? POLLIN : POLLOUT;
 468         for (offset = 0; offset < l;) {
 469                 r = f(fd, p + offset, l - offset);
 470                 if (r == 0) {
 471                         errno = EPIPE;
 472                         return offset;
 473                 }
 474                 if (r < 0) {
 475                         if (errno == EINTR)
 476                                 continue;
 477                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 478                                 (void)poll(&pfd, 1, -1); /* Ignore errors */
 479                                 continue;
 480                         }
 481                         return offset;
 482                 }
 483                 offset += (size_t)r;
 484                 *c += (off_t)r;
 485                 if (limit_rate)
 486                         bwlimit(r);
 487         }
 488         return offset;
 489 }
 490
 491 void
 492 toremote(char *targ, int argc, char **argv)
 493 {
 494         char *bp, *host, *src, *suser, *thost, *tuser, *arg;
 495         arglist alist;
 496         int i;
 497
 498         memset(&alist, '\0', sizeof(alist));
 499         alist.list = NULL;
 500
 501         *targ++ = 0;
 502         if (*targ == 0)
 503                 targ = ".";
 504
 505         arg = xstrdup(argv[argc - 1]);
 506         if ((thost = strrchr(arg, '@'))) {
 507                 /* user@host */
 508                 *thost++ = 0;
 509                 tuser = arg;
 510                 if (*tuser == '\0')
 511                         tuser = NULL;
 512         } else {
 513                 thost = arg;
 514                 tuser = NULL;
 515         }
 516
 517         if (tuser != NULL && !okname(tuser)) {
 518                 xfree(arg);
 519                 return;
 520         }
 521
 522         for (i = 0; i < argc - 1; i++) {
 523                 src = colon(argv[i]);
 524                 if (src) {      /* remote to remote */
 525                         freeargs(&alist);
 526                         addargs(&alist, "%s", ssh_program);
 527                         if (verbose_mode)
 528                                 addargs(&alist, "-v");
 529                         addargs(&alist, "-x");
 530                         addargs(&alist, "-oClearAllForwardings yes");
 531                         addargs(&alist, "-n");
 532
 533                         *src++ = 0;
 534                         if (*src == 0)
 535                                 src = ".";
 536                         host = strrchr(argv[i], '@');
 537
 538                         if (host) {
 539                                 *host++ = 0;
 540                                 host = cleanhostname(host);
 541                                 suser = argv[i];
 542                                 if (*suser == '\0')
 543                                         suser = pwd->pw_name;
 544                                 else if (!okname(suser))
 545                                         continue;
 546                                 addargs(&alist, "-l");
 547                                 addargs(&alist, "%s", suser);
 548                         } else {
 549                                 host = cleanhostname(argv[i]);
 550                         }
 551                         addargs(&alist, "%s", host);
 552                         addargs(&alist, "%s", cmd);
 553                         addargs(&alist, "%s", src);
 554                         addargs(&alist, "%s%s%s:%s",
 555                             tuser ? tuser : "", tuser ? "@" : "",
 556                             thost, targ);
 557                         if (do_local_cmd(&alist) != 0)
 558                                 errs = 1;
 559                 } else {        /* local to remote */
 560                         if (remin == -1) {
 561                                 xasprintf(&bp, "%s -t %s", cmd, targ);
 562                                 host = cleanhostname(thost);
 563                                 if (do_cmd(host, tuser, bp, &remin,
 564                                     &remout) < 0)
 565                                         exit(1);
 566                                 if (response() < 0)
 567                                         exit(1);
 568                                 (void) xfree(bp);
 569                         }
 570                         source(1, argv + i);
 571                 }
 572         }
 573         xfree(arg);
 574 }
 575
 576 void
 577 tolocal(int argc, char **argv)
 578 {
 579         char *bp, *host, *src, *suser;
 580         arglist alist;
 581         int i;
 582
 583         memset(&alist, '\0', sizeof(alist));
 584         alist.list = NULL;
 585
 586         for (i = 0; i < argc - 1; i++) {
 587                 if (!(src = colon(argv[i]))) {  /* Local to local. */
 588                         freeargs(&alist);
 589                         addargs(&alist, "%s", _PATH_CP);
 590                         if (iamrecursive)
 591                                 addargs(&alist, "-r");
 592                         if (pflag)
 593                                 addargs(&alist, "-p");
 594                         addargs(&alist, "%s", argv[i]);
 595                         addargs(&alist, "%s", argv[argc-1]);
 596                         if (do_local_cmd(&alist))
 597                                 ++errs;
 598                         continue;
 599                 }
 600                 *src++ = 0;
 601                 if (*src == 0)
 602                         src = ".";
 603                 if ((host = strrchr(argv[i], '@')) == NULL) {
 604                         host = argv[i];
 605                         suser = NULL;
 606                 } else {
 607                         *host++ = 0;
 608                         suser = argv[i];
 609                         if (*suser == '\0')
 610                                 suser = pwd->pw_name;
 611                 }
 612                 host = cleanhostname(host);
 613                 xasprintf(&bp, "%s -f %s", cmd, src);
 614                 if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
 615                         (void) xfree(bp);
 616                         ++errs;
 617                         continue;
 618                 }
 619                 xfree(bp);
 620                 sink(1, argv + argc - 1);
 621                 (void) close(remin);
 622                 remin = remout = -1;
 623         }
 624 }
 625
 626 void
 627 source(int argc, char **argv)
 628 {
 629         struct stat stb;
 630         static BUF buffer;
 631         BUF *bp;
 632         off_t i, 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 (scpio(vwrite, remout, bp->buf, amt,
 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 bwlimit(int amount)
 804 {
 805         static struct timeval bwstart, bwend;
 806         static int lamt, thresh = 16384;
 807         u_int64_t waitlen;
 808         struct timespec ts, rm;
 809
 810         if (!timerisset(&bwstart)) {
 811                 gettimeofday(&bwstart, NULL);
 812                 return;
 813         }
 814
 815         lamt += amount;
 816         if (lamt < thresh)
 817                 return;
 818
 819         gettimeofday(&bwend, NULL);
 820         timersub(&bwend, &bwstart, &bwend);
 821         if (!timerisset(&bwend))
 822                 return;
 823
 824         lamt *= 8;
 825         waitlen = (double)1000000L * lamt / limit_rate;
 826
 827         bwstart.tv_sec = waitlen / 1000000L;
 828         bwstart.tv_usec = waitlen % 1000000L;
 829
 830         if (timercmp(&bwstart, &bwend, >)) {
 831                 timersub(&bwstart, &bwend, &bwend);
 832
 833                 /* Adjust the wait time */
 834                 if (bwend.tv_sec) {
 835                         thresh /= 2;
 836                         if (thresh < 2048)
 837                                 thresh = 2048;
 838                 } else if (bwend.tv_usec < 10000) {
 839                         thresh *= 2;
 840                         if (thresh > COPY_BUFLEN * 4)
 841                                 thresh = COPY_BUFLEN * 4;
 842                 }
 843
 844                 TIMEVAL_TO_TIMESPEC(&bwend, &ts);
 845                 while (nanosleep(&ts, &rm) == -1) {
 846                         if (errno != EINTR)
 847                                 break;
 848                         ts = rm;
 849                 }
 850         }
 851
 852         lamt = 0;
 853         gettimeofday(&bwstart, NULL);
 854 }
 855
 856 void
 857 sink(int argc, char **argv)
 858 {
 859         static BUF buffer;
 860         struct stat stb;
 861         enum {
 862                 YES, NO, DISPLAYED
 863         } wrerr;
 864         BUF *bp;
 865         off_t i;
 866         size_t j, count;
 867         int amt, exists, first, ofd;
 868         mode_t mode, omode, mask;
 869         off_t size, statbytes;
 870         int setimes, targisdir, wrerrno = 0;
 871         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
 872         struct timeval tv[2];
 873
 874 #define atime   tv[0]
 875 #define mtime   tv[1]
 876 #define SCREWUP(str)    { why = str; goto screwup; }
 877
 878         setimes = targisdir = 0;
 879         mask = umask(0);
 880         if (!pflag)
 881                 (void) umask(mask);
 882         if (argc != 1) {
 883                 run_err("ambiguous target");
 884                 exit(1);
 885         }
 886         targ = *argv;
 887         if (targetshouldbedirectory)
 888                 verifydir(targ);
 889
 890         (void) atomicio(vwrite, remout, "", 1);
 891         if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
 892                 targisdir = 1;
 893         for (first = 1;; first = 0) {
 894                 cp = buf;
 895                 if (atomicio(read, remin, cp, 1) != 1)
 896                         return;
 897                 if (*cp++ == '\n')
 898                         SCREWUP("unexpected <newline>");
 899                 do {
 900                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
 901                                 SCREWUP("lost connection");
 902                         *cp++ = ch;
 903                 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
 904                 *cp = 0;
 905                 if (verbose_mode)
 906                         fprintf(stderr, "Sink: %s", buf);
 907
 908                 if (buf[0] == '\01' || buf[0] == '\02') {
 909                         if (iamremote == 0)
 910                                 (void) atomicio(vwrite, STDERR_FILENO,
 911                                     buf + 1, strlen(buf + 1));
 912                         if (buf[0] == '\02')
 913                                 exit(1);
 914                         ++errs;
 915                         continue;
 916                 }
 917                 if (buf[0] == 'E') {
 918                         (void) atomicio(vwrite, remout, "", 1);
 919                         return;
 920                 }
 921                 if (ch == '\n')
 922                         *--cp = 0;
 923
 924                 cp = buf;
 925                 if (*cp == 'T') {
 926                         setimes++;
 927                         cp++;
 928                         mtime.tv_sec = strtol(cp, &cp, 10);
 929                         if (!cp || *cp++ != ' ')
 930                                 SCREWUP("mtime.sec not delimited");
 931                         mtime.tv_usec = strtol(cp, &cp, 10);
 932                         if (!cp || *cp++ != ' ')
 933                                 SCREWUP("mtime.usec not delimited");
 934                         atime.tv_sec = strtol(cp, &cp, 10);
 935                         if (!cp || *cp++ != ' ')
 936                                 SCREWUP("atime.sec not delimited");
 937                         atime.tv_usec = strtol(cp, &cp, 10);
 938                         if (!cp || *cp++ != '\0')
 939                                 SCREWUP("atime.usec not delimited");
 940                         (void) atomicio(vwrite, remout, "", 1);
 941                         continue;
 942                 }
 943                 if (*cp != 'C' && *cp != 'D') {
 944                         /*
 945                          * Check for the case "rcp remote:foo\* local:bar".
 946                          * In this case, the line "No match." can be returned
 947                          * by the shell before the rcp command on the remote is
 948                          * executed so the ^Aerror_message convention isn't
 949                          * followed.
 950                          */
 951                         if (first) {
 952                                 run_err("%s", cp);
 953                                 exit(1);
 954                         }
 955                         SCREWUP("expected control record");
 956                 }
 957                 mode = 0;
 958                 for (++cp; cp < buf + 5; cp++) {
 959                         if (*cp < '0' || *cp > '7')
 960                                 SCREWUP("bad mode");
 961                         mode = (mode << 3) | (*cp - '0');
 962                 }
 963                 if (*cp++ != ' ')
 964                         SCREWUP("mode not delimited");
 965
 966                 for (size = 0; isdigit(*cp);)
 967                         size = size * 10 + (*cp++ - '0');
 968                 if (*cp++ != ' ')
 969                         SCREWUP("size not delimited");
 970                 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
 971                         run_err("error: unexpected filename: %s", cp);
 972                         exit(1);
 973                 }
 974                 if (targisdir) {
 975                         static char *namebuf;
 976                         static size_t cursize;
 977                         size_t need;
 978
 979                         need = strlen(targ) + strlen(cp) + 250;
 980                         if (need > cursize) {
 981                                 if (namebuf)
 982                                         xfree(namebuf);
 983                                 namebuf = xmalloc(need);
 984                                 cursize = need;
 985                         }
 986                         (void) snprintf(namebuf, need, "%s%s%s", targ,
 987                             strcmp(targ, "/") ? "/" : "", cp);
 988                         np = namebuf;
 989                 } else
 990                         np = targ;
 991                 curfile = cp;
 992                 exists = stat(np, &stb) == 0;
 993                 if (buf[0] == 'D') {
 994                         int mod_flag = pflag;
 995                         if (!iamrecursive)
 996                                 SCREWUP("received directory without -r");
 997                         if (exists) {
 998                                 if (!S_ISDIR(stb.st_mode)) {
 999                                         errno = ENOTDIR;
1000                                         goto bad;
1001                                 }
1002                                 if (pflag)
1003                                         (void) chmod(np, mode);
1004                         } else {
1005                                 /* Handle copying from a read-only
1006                                    directory */
1007                                 mod_flag = 1;
1008                                 if (mkdir(np, mode | S_IRWXU) < 0)
1009                                         goto bad;
1010                         }
1011                         vect[0] = xstrdup(np);
1012                         sink(1, vect);
1013                         if (setimes) {
1014                                 setimes = 0;
1015                                 if (utimes(vect[0], tv) < 0)
1016                                         run_err("%s: set times: %s",
1017                                             vect[0], strerror(errno));
1018                         }
1019                         if (mod_flag)
1020                                 (void) chmod(vect[0], mode);
1021                         if (vect[0])
1022                                 xfree(vect[0]);
1023                         continue;
1024                 }
1025                 omode = mode;
1026                 mode |= S_IWRITE;
1027                 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
1028 bad:                    run_err("%s: %s", np, strerror(errno));
1029                         continue;
1030                 }
1031                 (void) atomicio(vwrite, remout, "", 1);
1032                 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) {
1033                         (void) close(ofd);
1034                         continue;
1035                 }
1036                 cp = bp->buf;
1037                 wrerr = NO;
1038
1039                 statbytes = 0;
1040                 if (showprogress)
1041                         start_progress_meter(curfile, size, &statbytes);
1042                 set_nonblock(remin);
1043                 for (count = i = 0; i < size; i += bp->cnt) {
1044                         amt = bp->cnt;
1045                         if (i + amt > size)
1046                                 amt = size - i;
1047                         count += amt;
1048                         do {
1049                                 j = scpio(read, remin, cp, amt, &statbytes);
1050                                 if (j == 0) {
1051                                         run_err("%s", j != EPIPE ?
1052                                             strerror(errno) :
1053                                             "dropped connection");
1054                                         exit(1);
1055                                 }
1056                                 amt -= j;
1057                                 cp += j;
1058                         } while (amt > 0);
1059
1060                         if (count == bp->cnt) {
1061                                 /* Keep reading so we stay sync'd up. */
1062                                 if (wrerr == NO) {
1063                                         if (atomicio(vwrite, ofd, bp->buf,
1064                                             count) != count) {
1065                                                 wrerr = YES;
1066                                                 wrerrno = errno;
1067                                         }
1068                                 }
1069                                 count = 0;
1070                                 cp = bp->buf;
1071                         }
1072                 }
1073                 unset_nonblock(remin);
1074                 if (showprogress)
1075                         stop_progress_meter();
1076                 if (count != 0 && wrerr == NO &&
1077                     atomicio(vwrite, ofd, bp->buf, count) != count) {
1078                         wrerr = YES;
1079                         wrerrno = errno;
1080                 }
1081                 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) &&
1082                     ftruncate(ofd, size) != 0) {
1083                         run_err("%s: truncate: %s", np, strerror(errno));
1084                         wrerr = DISPLAYED;
1085                 }
1086                 if (pflag) {
1087                         if (exists || omode != mode)
1088 #ifdef HAVE_FCHMOD
1089                                 if (fchmod(ofd, omode)) {
1090 #else /* HAVE_FCHMOD */
1091                                 if (chmod(np, omode)) {
1092 #endif /* HAVE_FCHMOD */
1093                                         run_err("%s: set mode: %s",
1094                                             np, strerror(errno));
1095                                         wrerr = DISPLAYED;
1096                                 }
1097                 } else {
1098                         if (!exists && omode != mode)
1099 #ifdef HAVE_FCHMOD
1100                                 if (fchmod(ofd, omode & ~mask)) {
1101 #else /* HAVE_FCHMOD */
1102                                 if (chmod(np, omode & ~mask)) {
1103 #endif /* HAVE_FCHMOD */
1104                                         run_err("%s: set mode: %s",
1105                                             np, strerror(errno));
1106                                         wrerr = DISPLAYED;
1107                                 }
1108                 }
1109                 if (close(ofd) == -1) {
1110                         wrerr = YES;
1111                         wrerrno = errno;
1112                 }
1113                 (void) response();
1114                 if (setimes && wrerr == NO) {
1115                         setimes = 0;
1116                         if (utimes(np, tv) < 0) {
1117                                 run_err("%s: set times: %s",
1118                                     np, strerror(errno));
1119                                 wrerr = DISPLAYED;
1120                         }
1121                 }
1122                 switch (wrerr) {
1123                 case YES:
1124                         run_err("%s: %s", np, strerror(wrerrno));
1125                         break;
1126                 case NO:
1127                         (void) atomicio(vwrite, remout, "", 1);
1128                         break;
1129                 case DISPLAYED:
1130                         break;
1131                 }
1132         }
1133 screwup:
1134         run_err("protocol error: %s", why);
1135         exit(1);
1136 }
1137
1138 int
1139 response(void)
1140 {
1141         char ch, *cp, resp, rbuf[2048];
1142
1143         if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
1144                 lostconn(0);
1145
1146         cp = rbuf;
1147         switch (resp) {
1148         case 0:         /* ok */
1149                 return (0);
1150         default:
1151                 *cp++ = resp;
1152                 /* FALLTHROUGH */
1153         case 1:         /* error, followed by error msg */
1154         case 2:         /* fatal error, "" */
1155                 do {
1156                         if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch))
1157                                 lostconn(0);
1158                         *cp++ = ch;
1159                 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
1160
1161                 if (!iamremote)
1162                         (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
1163                 ++errs;
1164                 if (resp == 1)
1165                         return (-1);
1166                 exit(1);
1167         }
1168         /* NOTREACHED */
1169 }
1170
1171 void
1172 usage(void)
1173 {
1174         (void) fprintf(stderr,
1175             "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n"
1176             "           [-l limit] [-o ssh_option] [-P port] [-S program]\n"
1177             "           [[user@]host1:]file1 ... [[user@]host2:]file2\n");
1178         exit(1);
1179 }
1180
1181 void
1182 run_err(const char *fmt,...)
1183 {
1184         static FILE *fp;
1185         va_list ap;
1186
1187         ++errs;
1188         if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) {
1189                 (void) fprintf(fp, "%c", 0x01);
1190                 (void) fprintf(fp, "scp: ");
1191                 va_start(ap, fmt);
1192                 (void) vfprintf(fp, fmt, ap);
1193                 va_end(ap);
1194                 (void) fprintf(fp, "\n");
1195                 (void) fflush(fp);
1196         }
1197
1198         if (!iamremote) {
1199                 va_start(ap, fmt);
1200                 vfprintf(stderr, fmt, ap);
1201                 va_end(ap);
1202                 fprintf(stderr, "\n");
1203         }
1204 }
1205
1206 void
1207 verifydir(char *cp)
1208 {
1209         struct stat stb;
1210
1211         if (!stat(cp, &stb)) {
1212                 if (S_ISDIR(stb.st_mode))
1213                         return;
1214                 errno = ENOTDIR;
1215         }
1216         run_err("%s: %s", cp, strerror(errno));
1217         killchild(0);
1218 }
1219
1220 int
1221 okname(char *cp0)
1222 {
1223         int c;
1224         char *cp;
1225
1226         cp = cp0;
1227         do {
1228                 c = (int)*cp;
1229                 if (c & 0200)
1230                         goto bad;
1231                 if (!isalpha(c) && !isdigit(c)) {
1232                         switch (c) {
1233                         case '\'':
1234                         case '"':
1235                         case '`':
1236                         case ' ':
1237                         case '#':
1238                                 goto bad;
1239                         default:
1240                                 break;
1241                         }
1242                 }
1243         } while (*++cp);
1244         return (1);
1245
1246 bad:    fprintf(stderr, "%s: invalid user name\n", cp0);
1247         return (0);
1248 }
1249
1250 BUF *
1251 allocbuf(BUF *bp, int fd, int blksize)
1252 {
1253         size_t size;
1254 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
1255         struct stat stb;
1256
1257         if (fstat(fd, &stb) < 0) {
1258                 run_err("fstat: %s", strerror(errno));
1259                 return (0);
1260         }
1261         size = roundup(stb.st_blksize, blksize);
1262         if (size == 0)
1263                 size = blksize;
1264 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1265         size = blksize;
1266 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
1267         if (bp->cnt >= size)
1268                 return (bp);
1269         if (bp->buf == NULL)
1270                 bp->buf = xmalloc(size);
1271         else
1272                 bp->buf = xrealloc(bp->buf, 1, size);
1273         memset(bp->buf, 0, size);
1274         bp->cnt = size;
1275         return (bp);
1276 }
1277
1278 void
1279 lostconn(int signo)
1280 {
1281         if (!iamremote)
1282                 write(STDERR_FILENO, "lost connection\n", 16);
1283         if (signo)
1284                 _exit(1);
1285         else
1286                 exit(1);
1287 }