1 /* $OpenBSD: scp.c,v 1.165 2009/12/20 07:28:36 guenther Exp $ */ 2 /* 3 * scp - secure remote copy. This is basically patched BSD rcp which 4 * uses ssh to do the data transfer (instead of using rcmd). 5 * 6 * NOTE: This version should NOT be suid root. (This uses ssh to 7 * do the transfer and ssh has the necessary privileges.) 8 * 9 * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi> 10 * 11 * As far as I am concerned, the code I have written for this software 12 * can be used freely for any purpose. Any derived versions of this 13 * software must be clearly marked as such, and if the derived work is 14 * incompatible with the protocol description in the RFC file, it must be 15 * called by a name other than "ssh" or "Secure Shell". 16 */ 17 /* 18 * Copyright (c) 1999 Theo de Raadt. All rights reserved. 19 * Copyright (c) 1999 Aaron Campbell. All rights reserved. 20 * 21 * Redistribution and use in source and binary forms, with or without 22 * modification, are permitted provided that the following conditions 23 * are met: 24 * 1. Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * 2. Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in the 28 * documentation and/or other materials provided with the distribution. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 */ 41 42 /* 43 * Parts from: 44 * 45 * Copyright (c) 1983, 1990, 1992, 1993, 1995 46 * The Regents of the University of California. All rights reserved. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice, this list of conditions and the following disclaimer. 53 * 2. Redistributions in binary form must reproduce the above copyright 54 * notice, this list of conditions and the following disclaimer in the 55 * documentation and/or other materials provided with the distribution. 56 * 3. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 */ 73 74 #include "includes.h" 75 76 #include <sys/types.h> 77 #include <sys/param.h> 78 #ifdef HAVE_SYS_STAT_H 79 # include <sys/stat.h> 80 #endif 81 #ifdef HAVE_POLL_H 82 #include <poll.h> 83 #else 84 # ifdef HAVE_SYS_POLL_H 85 # include <sys/poll.h> 86 # endif 87 #endif 88 #ifdef HAVE_SYS_TIME_H 89 # include <sys/time.h> 90 #endif 91 #include <sys/wait.h> 92 #include <sys/uio.h> 93 94 #include <ctype.h> 95 #include <dirent.h> 96 #include <errno.h> 97 #include <fcntl.h> 98 #include <pwd.h> 99 #include <signal.h> 100 #include <stdarg.h> 101 #include <stdio.h> 102 #include <stdlib.h> 103 #include <string.h> 104 #include <time.h> 105 #include <unistd.h> 106 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) 107 #include <vis.h> 108 #endif 109 110 #include "xmalloc.h" 111 #include "atomicio.h" 112 #include "pathnames.h" 113 #include "log.h" 114 #include "misc.h" 115 #include "progressmeter.h" 116 117 extern char *__progname; 118 119 #define COPY_BUFLEN 16384 120 121 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout); 122 123 void bwlimit(int); 124 125 /* Struct for addargs */ 126 arglist args; 127 128 /* Bandwidth limit */ 129 off_t limit_rate = 0; 130 131 /* Name of current file being transferred. */ 132 char *curfile; 133 134 /* This is set to non-zero to enable verbose mode. */ 135 int verbose_mode = 0; 136 137 /* This is set to zero if the progressmeter is not desired. */ 138 int showprogress = 1; 139 140 /* This is the program to execute for the secured connection. ("ssh" or -S) */ 141 char *ssh_program = _PATH_SSH_PROGRAM; 142 143 /* This is used to store the pid of ssh_program */ 144 pid_t do_cmd_pid = -1; 145 146 static void 147 killchild(int signo) 148 { 149 if (do_cmd_pid > 1) { 150 kill(do_cmd_pid, signo ? signo : SIGTERM); 151 waitpid(do_cmd_pid, NULL, 0); 152 } 153 154 if (signo) 155 _exit(1); 156 exit(1); 157 } 158 159 static int 160 do_local_cmd(arglist *a) 161 { 162 u_int i; 163 int status; 164 pid_t pid; 165 166 if (a->num == 0) 167 fatal("do_local_cmd: no arguments"); 168 169 if (verbose_mode) { 170 fprintf(stderr, "Executing:"); 171 for (i = 0; i < a->num; i++) 172 fprintf(stderr, " %s", a->list[i]); 173 fprintf(stderr, "\n"); 174 } 175 if ((pid = fork()) == -1) 176 fatal("do_local_cmd: fork: %s", strerror(errno)); 177 178 if (pid == 0) { 179 execvp(a->list[0], a->list); 180 perror(a->list[0]); 181 exit(1); 182 } 183 184 do_cmd_pid = pid; 185 signal(SIGTERM, killchild); 186 signal(SIGINT, killchild); 187 signal(SIGHUP, killchild); 188 189 while (waitpid(pid, &status, 0) == -1) 190 if (errno != EINTR) 191 fatal("do_local_cmd: waitpid: %s", strerror(errno)); 192 193 do_cmd_pid = -1; 194 195 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 196 return (-1); 197 198 return (0); 199 } 200 201 /* 202 * This function executes the given command as the specified user on the 203 * given host. This returns < 0 if execution fails, and >= 0 otherwise. This 204 * assigns the input and output file descriptors on success. 205 */ 206 207 int 208 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout) 209 { 210 int pin[2], pout[2], reserved[2]; 211 212 if (verbose_mode) 213 fprintf(stderr, 214 "Executing: program %s host %s, user %s, command %s\n", 215 ssh_program, host, 216 remuser ? remuser : "(unspecified)", cmd); 217 218 /* 219 * Reserve two descriptors so that the real pipes won't get 220 * descriptors 0 and 1 because that will screw up dup2 below. 221 */ 222 if (pipe(reserved) < 0) 223 fatal("pipe: %s", strerror(errno)); 224 225 /* Create a socket pair for communicating with ssh. */ 226 if (pipe(pin) < 0) 227 fatal("pipe: %s", strerror(errno)); 228 if (pipe(pout) < 0) 229 fatal("pipe: %s", strerror(errno)); 230 231 /* Free the reserved descriptors. */ 232 close(reserved[0]); 233 close(reserved[1]); 234 235 /* Fork a child to execute the command on the remote host using ssh. */ 236 do_cmd_pid = fork(); 237 if (do_cmd_pid == 0) { 238 /* Child. */ 239 close(pin[1]); 240 close(pout[0]); 241 dup2(pin[0], 0); 242 dup2(pout[1], 1); 243 close(pin[0]); 244 close(pout[1]); 245 246 replacearg(&args, 0, "%s", ssh_program); 247 if (remuser != NULL) { 248 addargs(&args, "-l"); 249 addargs(&args, "%s", remuser); 250 } 251 addargs(&args, "--"); 252 addargs(&args, "%s", host); 253 addargs(&args, "%s", cmd); 254 255 execvp(ssh_program, args.list); 256 perror(ssh_program); 257 exit(1); 258 } else if (do_cmd_pid == -1) { 259 fatal("fork: %s", strerror(errno)); 260 } 261 /* Parent. Close the other side, and return the local side. */ 262 close(pin[0]); 263 *fdout = pin[1]; 264 close(pout[1]); 265 *fdin = pout[0]; 266 signal(SIGTERM, killchild); 267 signal(SIGINT, killchild); 268 signal(SIGHUP, killchild); 269 return 0; 270 } 271 272 typedef struct { 273 size_t cnt; 274 char *buf; 275 } BUF; 276 277 BUF *allocbuf(BUF *, int, int); 278 void lostconn(int); 279 int okname(char *); 280 void run_err(const char *,...); 281 void verifydir(char *); 282 283 struct passwd *pwd; 284 uid_t userid; 285 int errs, remin, remout; 286 int pflag, iamremote, iamrecursive, targetshouldbedirectory; 287 288 #define CMDNEEDS 64 289 char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */ 290 291 int response(void); 292 void rsource(char *, struct stat *); 293 void sink(int, char *[]); 294 void source(int, char *[]); 295 void tolocal(int, char *[]); 296 void toremote(char *, int, char *[]); 297 size_t scpio(ssize_t (*)(int, void *, size_t), int, void *, size_t, off_t *); 298 void usage(void); 299 300 int 301 main(int argc, char **argv) 302 { 303 int ch, fflag, tflag, status, n; 304 double speed; 305 char *targ, *endp, **newargv; 306 extern char *optarg; 307 extern int optind; 308 309 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 310 sanitise_stdfd(); 311 312 /* Copy argv, because we modify it */ 313 newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv)); 314 for (n = 0; n < argc; n++) 315 newargv[n] = xstrdup(argv[n]); 316 argv = newargv; 317 318 __progname = ssh_get_progname(argv[0]); 319 320 memset(&args, '\0', sizeof(args)); 321 args.list = NULL; 322 addargs(&args, "%s", ssh_program); 323 addargs(&args, "-x"); 324 addargs(&args, "-oForwardAgent no"); 325 addargs(&args, "-oPermitLocalCommand no"); 326 addargs(&args, "-oClearAllForwardings yes"); 327 328 fflag = tflag = 0; 329 while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q1246S:o:F:")) != -1) 330 switch (ch) { 331 /* User-visible flags. */ 332 case '1': 333 case '2': 334 case '4': 335 case '6': 336 case 'C': 337 addargs(&args, "-%c", ch); 338 break; 339 case 'o': 340 case 'c': 341 case 'i': 342 case 'F': 343 addargs(&args, "-%c", ch); 344 addargs(&args, "%s", optarg); 345 break; 346 case 'P': 347 addargs(&args, "-p"); 348 addargs(&args, "%s", optarg); 349 break; 350 case 'B': 351 addargs(&args, "-oBatchmode yes"); 352 break; 353 case 'l': 354 speed = strtod(optarg, &endp); 355 if (speed <= 0 || *endp != '\0') 356 usage(); 357 limit_rate = speed * 1024; 358 break; 359 case 'p': 360 pflag = 1; 361 break; 362 case 'r': 363 iamrecursive = 1; 364 break; 365 case 'S': 366 ssh_program = xstrdup(optarg); 367 break; 368 case 'v': 369 addargs(&args, "-v"); 370 verbose_mode = 1; 371 break; 372 case 'q': 373 addargs(&args, "-q"); 374 showprogress = 0; 375 break; 376 377 /* Server options. */ 378 case 'd': 379 targetshouldbedirectory = 1; 380 break; 381 case 'f': /* "from" */ 382 iamremote = 1; 383 fflag = 1; 384 break; 385 case 't': /* "to" */ 386 iamremote = 1; 387 tflag = 1; 388 #ifdef HAVE_CYGWIN 389 setmode(0, O_BINARY); 390 #endif 391 break; 392 default: 393 usage(); 394 } 395 argc -= optind; 396 argv += optind; 397 398 if ((pwd = getpwuid(userid = getuid())) == NULL) 399 fatal("unknown user %u", (u_int) userid); 400 401 if (!isatty(STDOUT_FILENO)) 402 showprogress = 0; 403 404 remin = STDIN_FILENO; 405 remout = STDOUT_FILENO; 406 407 if (fflag) { 408 /* Follow "protocol", send data. */ 409 (void) response(); 410 source(argc, argv); 411 exit(errs != 0); 412 } 413 if (tflag) { 414 /* Receive data. */ 415 sink(argc, argv); 416 exit(errs != 0); 417 } 418 if (argc < 2) 419 usage(); 420 if (argc > 2) 421 targetshouldbedirectory = 1; 422 423 remin = remout = -1; 424 do_cmd_pid = -1; 425 /* Command to be executed on remote system using "ssh". */ 426 (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s", 427 verbose_mode ? " -v" : "", 428 iamrecursive ? " -r" : "", pflag ? " -p" : "", 429 targetshouldbedirectory ? " -d" : ""); 430 431 (void) signal(SIGPIPE, lostconn); 432 433 if ((targ = colon(argv[argc - 1]))) /* Dest is remote host. */ 434 toremote(targ, argc, argv); 435 else { 436 if (targetshouldbedirectory) 437 verifydir(argv[argc - 1]); 438 tolocal(argc, argv); /* Dest is local host. */ 439 } 440 /* 441 * Finally check the exit status of the ssh process, if one was forked 442 * and no error has occurred yet 443 */ 444 if (do_cmd_pid != -1 && errs == 0) { 445 if (remin != -1) 446 (void) close(remin); 447 if (remout != -1) 448 (void) close(remout); 449 if (waitpid(do_cmd_pid, &status, 0) == -1) 450 errs = 1; 451 else { 452 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 453 errs = 1; 454 } 455 } 456 exit(errs != 0); 457 } 458 459 /* 460 * atomicio-like wrapper that also applies bandwidth limits and updates 461 * the progressmeter counter. 462 */ 463 size_t 464 scpio(ssize_t (*f)(int, void *, size_t), int fd, void *_p, size_t l, off_t *c) 465 { 466 u_char *p = (u_char *)_p; 467 size_t offset; 468 ssize_t r; 469 struct pollfd pfd; 470 471 pfd.fd = fd; 472 pfd.events = f == read ? POLLIN : POLLOUT; 473 for (offset = 0; offset < l;) { 474 r = f(fd, p + offset, l - offset); 475 if (r == 0) { 476 errno = EPIPE; 477 return offset; 478 } 479 if (r < 0) { 480 if (errno == EINTR) 481 continue; 482 if (errno == EAGAIN || errno == EWOULDBLOCK) { 483 (void)poll(&pfd, 1, -1); /* Ignore errors */ 484 continue; 485 } 486 return offset; 487 } 488 offset += (size_t)r; 489 *c += (off_t)r; 490 if (limit_rate) 491 bwlimit(r); 492 } 493 return offset; 494 } 495 496 void 497 toremote(char *targ, int argc, char **argv) 498 { 499 char *bp, *host, *src, *suser, *thost, *tuser, *arg; 500 arglist alist; 501 int i; 502 503 memset(&alist, '\0', sizeof(alist)); 504 alist.list = NULL; 505 506 *targ++ = 0; 507 if (*targ == 0) 508 targ = "."; 509 510 arg = xstrdup(argv[argc - 1]); 511 if ((thost = strrchr(arg, '@'))) { 512 /* user@host */ 513 *thost++ = 0; 514 tuser = arg; 515 if (*tuser == '\0') 516 tuser = NULL; 517 } else { 518 thost = arg; 519 tuser = NULL; 520 } 521 522 if (tuser != NULL && !okname(tuser)) { 523 xfree(arg); 524 return; 525 } 526 527 for (i = 0; i < argc - 1; i++) { 528 src = colon(argv[i]); 529 if (src) { /* remote to remote */ 530 freeargs(&alist); 531 addargs(&alist, "%s", ssh_program); 532 if (verbose_mode) 533 addargs(&alist, "-v"); 534 addargs(&alist, "-x"); 535 addargs(&alist, "-oClearAllForwardings yes"); 536 addargs(&alist, "-n"); 537 538 *src++ = 0; 539 if (*src == 0) 540 src = "."; 541 host = strrchr(argv[i], '@'); 542 543 if (host) { 544 *host++ = 0; 545 host = cleanhostname(host); 546 suser = argv[i]; 547 if (*suser == '\0') 548 suser = pwd->pw_name; 549 else if (!okname(suser)) 550 continue; 551 addargs(&alist, "-l"); 552 addargs(&alist, "%s", suser); 553 } else { 554 host = cleanhostname(argv[i]); 555 } 556 addargs(&alist, "--"); 557 addargs(&alist, "%s", host); 558 addargs(&alist, "%s", cmd); 559 addargs(&alist, "%s", src); 560 addargs(&alist, "%s%s%s:%s", 561 tuser ? tuser : "", tuser ? "@" : "", 562 thost, targ); 563 if (do_local_cmd(&alist) != 0) 564 errs = 1; 565 } else { /* local to remote */ 566 if (remin == -1) { 567 xasprintf(&bp, "%s -t -- %s", cmd, targ); 568 host = cleanhostname(thost); 569 if (do_cmd(host, tuser, bp, &remin, 570 &remout) < 0) 571 exit(1); 572 if (response() < 0) 573 exit(1); 574 (void) xfree(bp); 575 } 576 source(1, argv + i); 577 } 578 } 579 xfree(arg); 580 } 581 582 void 583 tolocal(int argc, char **argv) 584 { 585 char *bp, *host, *src, *suser; 586 arglist alist; 587 int i; 588 589 memset(&alist, '\0', sizeof(alist)); 590 alist.list = NULL; 591 592 for (i = 0; i < argc - 1; i++) { 593 if (!(src = colon(argv[i]))) { /* Local to local. */ 594 freeargs(&alist); 595 addargs(&alist, "%s", _PATH_CP); 596 if (iamrecursive) 597 addargs(&alist, "-r"); 598 if (pflag) 599 addargs(&alist, "-p"); 600 addargs(&alist, "--"); 601 addargs(&alist, "%s", argv[i]); 602 addargs(&alist, "%s", argv[argc-1]); 603 if (do_local_cmd(&alist)) 604 ++errs; 605 continue; 606 } 607 *src++ = 0; 608 if (*src == 0) 609 src = "."; 610 if ((host = strrchr(argv[i], '@')) == NULL) { 611 host = argv[i]; 612 suser = NULL; 613 } else { 614 *host++ = 0; 615 suser = argv[i]; 616 if (*suser == '\0') 617 suser = pwd->pw_name; 618 } 619 host = cleanhostname(host); 620 xasprintf(&bp, "%s -f -- %s", cmd, src); 621 if (do_cmd(host, suser, bp, &remin, &remout) < 0) { 622 (void) xfree(bp); 623 ++errs; 624 continue; 625 } 626 xfree(bp); 627 sink(1, argv + argc - 1); 628 (void) close(remin); 629 remin = remout = -1; 630 } 631 } 632 633 void 634 source(int argc, char **argv) 635 { 636 struct stat stb; 637 static BUF buffer; 638 BUF *bp; 639 off_t i, statbytes; 640 size_t amt; 641 int fd = -1, haderr, indx; 642 char *last, *name, buf[2048], encname[MAXPATHLEN]; 643 int len; 644 645 for (indx = 0; indx < argc; ++indx) { 646 name = argv[indx]; 647 statbytes = 0; 648 len = strlen(name); 649 while (len > 1 && name[len-1] == '/') 650 name[--len] = '\0'; 651 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0) 652 goto syserr; 653 if (strchr(name, '\n') != NULL) { 654 strnvis(encname, name, sizeof(encname), VIS_NL); 655 name = encname; 656 } 657 if (fstat(fd, &stb) < 0) { 658 syserr: run_err("%s: %s", name, strerror(errno)); 659 goto next; 660 } 661 if (stb.st_size < 0) { 662 run_err("%s: %s", name, "Negative file size"); 663 goto next; 664 } 665 unset_nonblock(fd); 666 switch (stb.st_mode & S_IFMT) { 667 case S_IFREG: 668 break; 669 case S_IFDIR: 670 if (iamrecursive) { 671 rsource(name, &stb); 672 goto next; 673 } 674 /* FALLTHROUGH */ 675 default: 676 run_err("%s: not a regular file", name); 677 goto next; 678 } 679 if ((last = strrchr(name, '/')) == NULL) 680 last = name; 681 else 682 ++last; 683 curfile = last; 684 if (pflag) { 685 /* 686 * Make it compatible with possible future 687 * versions expecting microseconds. 688 */ 689 (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n", 690 (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime), 691 (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime)); 692 if (verbose_mode) { 693 fprintf(stderr, "File mtime %ld atime %ld\n", 694 (long)stb.st_mtime, (long)stb.st_atime); 695 fprintf(stderr, "Sending file timestamps: %s", 696 buf); 697 } 698 (void) atomicio(vwrite, remout, buf, strlen(buf)); 699 if (response() < 0) 700 goto next; 701 } 702 #define FILEMODEMASK (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO) 703 snprintf(buf, sizeof buf, "C%04o %lld %s\n", 704 (u_int) (stb.st_mode & FILEMODEMASK), 705 (long long)stb.st_size, last); 706 if (verbose_mode) { 707 fprintf(stderr, "Sending file modes: %s", buf); 708 } 709 (void) atomicio(vwrite, remout, buf, strlen(buf)); 710 if (response() < 0) 711 goto next; 712 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) { 713 next: if (fd != -1) { 714 (void) close(fd); 715 fd = -1; 716 } 717 continue; 718 } 719 if (showprogress) 720 start_progress_meter(curfile, stb.st_size, &statbytes); 721 set_nonblock(remout); 722 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) { 723 amt = bp->cnt; 724 if (i + (off_t)amt > stb.st_size) 725 amt = stb.st_size - i; 726 if (!haderr) { 727 if (atomicio(read, fd, bp->buf, amt) != amt) 728 haderr = errno; 729 } 730 /* Keep writing after error to retain sync */ 731 if (haderr) { 732 (void)atomicio(vwrite, remout, bp->buf, amt); 733 continue; 734 } 735 if (scpio(vwrite, remout, bp->buf, amt, 736 &statbytes) != amt) 737 haderr = errno; 738 } 739 unset_nonblock(remout); 740 if (showprogress) 741 stop_progress_meter(); 742 743 if (fd != -1) { 744 if (close(fd) < 0 && !haderr) 745 haderr = errno; 746 fd = -1; 747 } 748 if (!haderr) 749 (void) atomicio(vwrite, remout, "", 1); 750 else 751 run_err("%s: %s", name, strerror(haderr)); 752 (void) response(); 753 } 754 } 755 756 void 757 rsource(char *name, struct stat *statp) 758 { 759 DIR *dirp; 760 struct dirent *dp; 761 char *last, *vect[1], path[1100]; 762 763 if (!(dirp = opendir(name))) { 764 run_err("%s: %s", name, strerror(errno)); 765 return; 766 } 767 last = strrchr(name, '/'); 768 if (last == 0) 769 last = name; 770 else 771 last++; 772 if (pflag) { 773 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n", 774 (u_long) statp->st_mtime, 775 (u_long) statp->st_atime); 776 (void) atomicio(vwrite, remout, path, strlen(path)); 777 if (response() < 0) { 778 closedir(dirp); 779 return; 780 } 781 } 782 (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n", 783 (u_int) (statp->st_mode & FILEMODEMASK), 0, last); 784 if (verbose_mode) 785 fprintf(stderr, "Entering directory: %s", path); 786 (void) atomicio(vwrite, remout, path, strlen(path)); 787 if (response() < 0) { 788 closedir(dirp); 789 return; 790 } 791 while ((dp = readdir(dirp)) != NULL) { 792 if (dp->d_ino == 0) 793 continue; 794 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) 795 continue; 796 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) { 797 run_err("%s/%s: name too long", name, dp->d_name); 798 continue; 799 } 800 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name); 801 vect[0] = path; 802 source(1, vect); 803 } 804 (void) closedir(dirp); 805 (void) atomicio(vwrite, remout, "E\n", 2); 806 (void) response(); 807 } 808 809 void 810 bwlimit(int amount) 811 { 812 static struct timeval bwstart, bwend; 813 static int lamt, thresh = 16384; 814 u_int64_t waitlen; 815 struct timespec ts, rm; 816 817 if (!timerisset(&bwstart)) { 818 gettimeofday(&bwstart, NULL); 819 return; 820 } 821 822 lamt += amount; 823 if (lamt < thresh) 824 return; 825 826 gettimeofday(&bwend, NULL); 827 timersub(&bwend, &bwstart, &bwend); 828 if (!timerisset(&bwend)) 829 return; 830 831 lamt *= 8; 832 waitlen = (double)1000000L * lamt / limit_rate; 833 834 bwstart.tv_sec = waitlen / 1000000L; 835 bwstart.tv_usec = waitlen % 1000000L; 836 837 if (timercmp(&bwstart, &bwend, >)) { 838 timersub(&bwstart, &bwend, &bwend); 839 840 /* Adjust the wait time */ 841 if (bwend.tv_sec) { 842 thresh /= 2; 843 if (thresh < 2048) 844 thresh = 2048; 845 } else if (bwend.tv_usec < 10000) { 846 thresh *= 2; 847 if (thresh > COPY_BUFLEN * 4) 848 thresh = COPY_BUFLEN * 4; 849 } 850 851 TIMEVAL_TO_TIMESPEC(&bwend, &ts); 852 while (nanosleep(&ts, &rm) == -1) { 853 if (errno != EINTR) 854 break; 855 ts = rm; 856 } 857 } 858 859 lamt = 0; 860 gettimeofday(&bwstart, NULL); 861 } 862 863 void 864 sink(int argc, char **argv) 865 { 866 static BUF buffer; 867 struct stat stb; 868 enum { 869 YES, NO, DISPLAYED 870 } wrerr; 871 BUF *bp; 872 off_t i; 873 size_t j, count; 874 int amt, exists, first, ofd; 875 mode_t mode, omode, mask; 876 off_t size, statbytes; 877 int setimes, targisdir, wrerrno = 0; 878 char ch, *cp, *np, *targ, *why, *vect[1], buf[2048]; 879 struct timeval tv[2]; 880 881 #define atime tv[0] 882 #define mtime tv[1] 883 #define SCREWUP(str) { why = str; goto screwup; } 884 885 setimes = targisdir = 0; 886 mask = umask(0); 887 if (!pflag) 888 (void) umask(mask); 889 if (argc != 1) { 890 run_err("ambiguous target"); 891 exit(1); 892 } 893 targ = *argv; 894 if (targetshouldbedirectory) 895 verifydir(targ); 896 897 (void) atomicio(vwrite, remout, "", 1); 898 if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode)) 899 targisdir = 1; 900 for (first = 1;; first = 0) { 901 cp = buf; 902 if (atomicio(read, remin, cp, 1) != 1) 903 return; 904 if (*cp++ == '\n') 905 SCREWUP("unexpected <newline>"); 906 do { 907 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) 908 SCREWUP("lost connection"); 909 *cp++ = ch; 910 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n'); 911 *cp = 0; 912 if (verbose_mode) 913 fprintf(stderr, "Sink: %s", buf); 914 915 if (buf[0] == '\01' || buf[0] == '\02') { 916 if (iamremote == 0) 917 (void) atomicio(vwrite, STDERR_FILENO, 918 buf + 1, strlen(buf + 1)); 919 if (buf[0] == '\02') 920 exit(1); 921 ++errs; 922 continue; 923 } 924 if (buf[0] == 'E') { 925 (void) atomicio(vwrite, remout, "", 1); 926 return; 927 } 928 if (ch == '\n') 929 *--cp = 0; 930 931 cp = buf; 932 if (*cp == 'T') { 933 setimes++; 934 cp++; 935 mtime.tv_sec = strtol(cp, &cp, 10); 936 if (!cp || *cp++ != ' ') 937 SCREWUP("mtime.sec not delimited"); 938 mtime.tv_usec = strtol(cp, &cp, 10); 939 if (!cp || *cp++ != ' ') 940 SCREWUP("mtime.usec not delimited"); 941 atime.tv_sec = strtol(cp, &cp, 10); 942 if (!cp || *cp++ != ' ') 943 SCREWUP("atime.sec not delimited"); 944 atime.tv_usec = strtol(cp, &cp, 10); 945 if (!cp || *cp++ != '\0') 946 SCREWUP("atime.usec not delimited"); 947 (void) atomicio(vwrite, remout, "", 1); 948 continue; 949 } 950 if (*cp != 'C' && *cp != 'D') { 951 /* 952 * Check for the case "rcp remote:foo\* local:bar". 953 * In this case, the line "No match." can be returned 954 * by the shell before the rcp command on the remote is 955 * executed so the ^Aerror_message convention isn't 956 * followed. 957 */ 958 if (first) { 959 run_err("%s", cp); 960 exit(1); 961 } 962 SCREWUP("expected control record"); 963 } 964 mode = 0; 965 for (++cp; cp < buf + 5; cp++) { 966 if (*cp < '0' || *cp > '7') 967 SCREWUP("bad mode"); 968 mode = (mode << 3) | (*cp - '0'); 969 } 970 if (*cp++ != ' ') 971 SCREWUP("mode not delimited"); 972 973 for (size = 0; isdigit(*cp);) 974 size = size * 10 + (*cp++ - '0'); 975 if (*cp++ != ' ') 976 SCREWUP("size not delimited"); 977 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) { 978 run_err("error: unexpected filename: %s", cp); 979 exit(1); 980 } 981 if (targisdir) { 982 static char *namebuf; 983 static size_t cursize; 984 size_t need; 985 986 need = strlen(targ) + strlen(cp) + 250; 987 if (need > cursize) { 988 if (namebuf) 989 xfree(namebuf); 990 namebuf = xmalloc(need); 991 cursize = need; 992 } 993 (void) snprintf(namebuf, need, "%s%s%s", targ, 994 strcmp(targ, "/") ? "/" : "", cp); 995 np = namebuf; 996 } else 997 np = targ; 998 curfile = cp; 999 exists = stat(np, &stb) == 0; 1000 if (buf[0] == 'D') { 1001 int mod_flag = pflag; 1002 if (!iamrecursive) 1003 SCREWUP("received directory without -r"); 1004 if (exists) { 1005 if (!S_ISDIR(stb.st_mode)) { 1006 errno = ENOTDIR; 1007 goto bad; 1008 } 1009 if (pflag) 1010 (void) chmod(np, mode); 1011 } else { 1012 /* Handle copying from a read-only 1013 directory */ 1014 mod_flag = 1; 1015 if (mkdir(np, mode | S_IRWXU) < 0) 1016 goto bad; 1017 } 1018 vect[0] = xstrdup(np); 1019 sink(1, vect); 1020 if (setimes) { 1021 setimes = 0; 1022 if (utimes(vect[0], tv) < 0) 1023 run_err("%s: set times: %s", 1024 vect[0], strerror(errno)); 1025 } 1026 if (mod_flag) 1027 (void) chmod(vect[0], mode); 1028 if (vect[0]) 1029 xfree(vect[0]); 1030 continue; 1031 } 1032 omode = mode; 1033 mode |= S_IWRITE; 1034 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) { 1035 bad: run_err("%s: %s", np, strerror(errno)); 1036 continue; 1037 } 1038 (void) atomicio(vwrite, remout, "", 1); 1039 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) { 1040 (void) close(ofd); 1041 continue; 1042 } 1043 cp = bp->buf; 1044 wrerr = NO; 1045 1046 statbytes = 0; 1047 if (showprogress) 1048 start_progress_meter(curfile, size, &statbytes); 1049 set_nonblock(remin); 1050 for (count = i = 0; i < size; i += bp->cnt) { 1051 amt = bp->cnt; 1052 if (i + amt > size) 1053 amt = size - i; 1054 count += amt; 1055 do { 1056 j = scpio(read, remin, cp, amt, &statbytes); 1057 if (j == 0) { 1058 run_err("%s", j != EPIPE ? 1059 strerror(errno) : 1060 "dropped connection"); 1061 exit(1); 1062 } 1063 amt -= j; 1064 cp += j; 1065 } while (amt > 0); 1066 1067 if (count == bp->cnt) { 1068 /* Keep reading so we stay sync'd up. */ 1069 if (wrerr == NO) { 1070 if (atomicio(vwrite, ofd, bp->buf, 1071 count) != count) { 1072 wrerr = YES; 1073 wrerrno = errno; 1074 } 1075 } 1076 count = 0; 1077 cp = bp->buf; 1078 } 1079 } 1080 unset_nonblock(remin); 1081 if (showprogress) 1082 stop_progress_meter(); 1083 if (count != 0 && wrerr == NO && 1084 atomicio(vwrite, ofd, bp->buf, count) != count) { 1085 wrerr = YES; 1086 wrerrno = errno; 1087 } 1088 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) && 1089 ftruncate(ofd, size) != 0) { 1090 run_err("%s: truncate: %s", np, strerror(errno)); 1091 wrerr = DISPLAYED; 1092 } 1093 if (pflag) { 1094 if (exists || omode != mode) 1095 #ifdef HAVE_FCHMOD 1096 if (fchmod(ofd, omode)) { 1097 #else /* HAVE_FCHMOD */ 1098 if (chmod(np, omode)) { 1099 #endif /* HAVE_FCHMOD */ 1100 run_err("%s: set mode: %s", 1101 np, strerror(errno)); 1102 wrerr = DISPLAYED; 1103 } 1104 } else { 1105 if (!exists && omode != mode) 1106 #ifdef HAVE_FCHMOD 1107 if (fchmod(ofd, omode & ~mask)) { 1108 #else /* HAVE_FCHMOD */ 1109 if (chmod(np, omode & ~mask)) { 1110 #endif /* HAVE_FCHMOD */ 1111 run_err("%s: set mode: %s", 1112 np, strerror(errno)); 1113 wrerr = DISPLAYED; 1114 } 1115 } 1116 if (close(ofd) == -1) { 1117 wrerr = YES; 1118 wrerrno = errno; 1119 } 1120 (void) response(); 1121 if (setimes && wrerr == NO) { 1122 setimes = 0; 1123 if (utimes(np, tv) < 0) { 1124 run_err("%s: set times: %s", 1125 np, strerror(errno)); 1126 wrerr = DISPLAYED; 1127 } 1128 } 1129 switch (wrerr) { 1130 case YES: 1131 run_err("%s: %s", np, strerror(wrerrno)); 1132 break; 1133 case NO: 1134 (void) atomicio(vwrite, remout, "", 1); 1135 break; 1136 case DISPLAYED: 1137 break; 1138 } 1139 } 1140 screwup: 1141 run_err("protocol error: %s", why); 1142 exit(1); 1143 } 1144 1145 int 1146 response(void) 1147 { 1148 char ch, *cp, resp, rbuf[2048]; 1149 1150 if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp)) 1151 lostconn(0); 1152 1153 cp = rbuf; 1154 switch (resp) { 1155 case 0: /* ok */ 1156 return (0); 1157 default: 1158 *cp++ = resp; 1159 /* FALLTHROUGH */ 1160 case 1: /* error, followed by error msg */ 1161 case 2: /* fatal error, "" */ 1162 do { 1163 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) 1164 lostconn(0); 1165 *cp++ = ch; 1166 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n'); 1167 1168 if (!iamremote) 1169 (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf); 1170 ++errs; 1171 if (resp == 1) 1172 return (-1); 1173 exit(1); 1174 } 1175 /* NOTREACHED */ 1176 } 1177 1178 void 1179 usage(void) 1180 { 1181 (void) fprintf(stderr, 1182 "usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n" 1183 " [-l limit] [-o ssh_option] [-P port] [-S program]\n" 1184 " [[user@]host1:]file1 ... [[user@]host2:]file2\n"); 1185 exit(1); 1186 } 1187 1188 void 1189 run_err(const char *fmt,...) 1190 { 1191 static FILE *fp; 1192 va_list ap; 1193 1194 ++errs; 1195 if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) { 1196 (void) fprintf(fp, "%c", 0x01); 1197 (void) fprintf(fp, "scp: "); 1198 va_start(ap, fmt); 1199 (void) vfprintf(fp, fmt, ap); 1200 va_end(ap); 1201 (void) fprintf(fp, "\n"); 1202 (void) fflush(fp); 1203 } 1204 1205 if (!iamremote) { 1206 va_start(ap, fmt); 1207 vfprintf(stderr, fmt, ap); 1208 va_end(ap); 1209 fprintf(stderr, "\n"); 1210 } 1211 } 1212 1213 void 1214 verifydir(char *cp) 1215 { 1216 struct stat stb; 1217 1218 if (!stat(cp, &stb)) { 1219 if (S_ISDIR(stb.st_mode)) 1220 return; 1221 errno = ENOTDIR; 1222 } 1223 run_err("%s: %s", cp, strerror(errno)); 1224 killchild(0); 1225 } 1226 1227 int 1228 okname(char *cp0) 1229 { 1230 int c; 1231 char *cp; 1232 1233 cp = cp0; 1234 do { 1235 c = (int)*cp; 1236 if (c & 0200) 1237 goto bad; 1238 if (!isalpha(c) && !isdigit(c)) { 1239 switch (c) { 1240 case '\'': 1241 case '"': 1242 case '`': 1243 case ' ': 1244 case '#': 1245 goto bad; 1246 default: 1247 break; 1248 } 1249 } 1250 } while (*++cp); 1251 return (1); 1252 1253 bad: fprintf(stderr, "%s: invalid user name\n", cp0); 1254 return (0); 1255 } 1256 1257 BUF * 1258 allocbuf(BUF *bp, int fd, int blksize) 1259 { 1260 size_t size; 1261 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE 1262 struct stat stb; 1263 1264 if (fstat(fd, &stb) < 0) { 1265 run_err("fstat: %s", strerror(errno)); 1266 return (0); 1267 } 1268 size = roundup(stb.st_blksize, blksize); 1269 if (size == 0) 1270 size = blksize; 1271 #else /* HAVE_STRUCT_STAT_ST_BLKSIZE */ 1272 size = blksize; 1273 #endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */ 1274 if (bp->cnt >= size) 1275 return (bp); 1276 if (bp->buf == NULL) 1277 bp->buf = xmalloc(size); 1278 else 1279 bp->buf = xrealloc(bp->buf, 1, size); 1280 memset(bp->buf, 0, size); 1281 bp->cnt = size; 1282 return (bp); 1283 } 1284 1285 void 1286 lostconn(int signo) 1287 { 1288 if (!iamremote) 1289 write(STDERR_FILENO, "lost connection\n", 16); 1290 if (signo) 1291 _exit(1); 1292 else 1293 exit(1); 1294 } 1295