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[16384], 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[16384]; 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 } 1288