1 /* $OpenBSD: scp.c,v 1.198 2018/11/16 03:03:10 djm Exp $ */ 2 /* 3 * scp - secure remote copy. This is basically patched BSD rcp which 4 * uses ssh to do the data transfer (instead of using rcmd). 5 * 6 * NOTE: This version should NOT be suid root. (This uses ssh to 7 * do the transfer and ssh has the necessary privileges.) 8 * 9 * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi> 10 * 11 * As far as I am concerned, the code I have written for this software 12 * can be used freely for any purpose. Any derived versions of this 13 * software must be clearly marked as such, and if the derived work is 14 * incompatible with the protocol description in the RFC file, it must be 15 * called by a name other than "ssh" or "Secure Shell". 16 */ 17 /* 18 * Copyright (c) 1999 Theo de Raadt. All rights reserved. 19 * Copyright (c) 1999 Aaron Campbell. All rights reserved. 20 * 21 * Redistribution and use in source and binary forms, with or without 22 * modification, are permitted provided that the following conditions 23 * are met: 24 * 1. Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * 2. Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in the 28 * documentation and/or other materials provided with the distribution. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 */ 41 42 /* 43 * Parts from: 44 * 45 * Copyright (c) 1983, 1990, 1992, 1993, 1995 46 * The Regents of the University of California. All rights reserved. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice, this list of conditions and the following disclaimer. 53 * 2. Redistributions in binary form must reproduce the above copyright 54 * notice, this list of conditions and the following disclaimer in the 55 * documentation and/or other materials provided with the distribution. 56 * 3. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 */ 73 74 #include <sys/types.h> 75 #include <sys/poll.h> 76 #include <sys/wait.h> 77 #include <sys/stat.h> 78 #include <sys/time.h> 79 #include <sys/uio.h> 80 81 #include <ctype.h> 82 #include <dirent.h> 83 #include <errno.h> 84 #include <fcntl.h> 85 #include <locale.h> 86 #include <pwd.h> 87 #include <signal.h> 88 #include <stdarg.h> 89 #include <stdint.h> 90 #include <stdio.h> 91 #include <stdlib.h> 92 #include <string.h> 93 #include <time.h> 94 #include <unistd.h> 95 #include <limits.h> 96 #include <vis.h> 97 98 #include "xmalloc.h" 99 #include "ssh.h" 100 #include "atomicio.h" 101 #include "pathnames.h" 102 #include "log.h" 103 #include "misc.h" 104 #include "progressmeter.h" 105 #include "utf8.h" 106 107 #define COPY_BUFLEN 16384 108 109 int do_cmd(char *host, char *remuser, int port, char *cmd, int *fdin, int *fdout); 110 int do_cmd2(char *host, char *remuser, int port, char *cmd, int fdin, int fdout); 111 112 /* Struct for addargs */ 113 arglist args; 114 arglist remote_remote_args; 115 116 /* Bandwidth limit */ 117 long long limit_kbps = 0; 118 struct bwlimit bwlimit; 119 120 /* Name of current file being transferred. */ 121 char *curfile; 122 123 /* This is set to non-zero to enable verbose mode. */ 124 int verbose_mode = 0; 125 126 /* This is set to zero if the progressmeter is not desired. */ 127 int showprogress = 1; 128 129 /* 130 * This is set to non-zero if remote-remote copy should be piped 131 * through this process. 132 */ 133 int throughlocal = 0; 134 135 /* Non-standard port to use for the ssh connection or -1. */ 136 int sshport = -1; 137 138 /* This is the program to execute for the secured connection. ("ssh" or -S) */ 139 char *ssh_program = _PATH_SSH_PROGRAM; 140 141 /* This is used to store the pid of ssh_program */ 142 pid_t do_cmd_pid = -1; 143 144 static void 145 killchild(int signo) 146 { 147 if (do_cmd_pid > 1) { 148 kill(do_cmd_pid, signo ? signo : SIGTERM); 149 waitpid(do_cmd_pid, NULL, 0); 150 } 151 152 if (signo) 153 _exit(1); 154 exit(1); 155 } 156 157 static void 158 suspchild(int signo) 159 { 160 int status; 161 162 if (do_cmd_pid > 1) { 163 kill(do_cmd_pid, signo); 164 while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 && 165 errno == EINTR) 166 ; 167 kill(getpid(), SIGSTOP); 168 } 169 } 170 171 static int 172 do_local_cmd(arglist *a) 173 { 174 u_int i; 175 int status; 176 pid_t pid; 177 178 if (a->num == 0) 179 fatal("do_local_cmd: no arguments"); 180 181 if (verbose_mode) { 182 fprintf(stderr, "Executing:"); 183 for (i = 0; i < a->num; i++) 184 fmprintf(stderr, " %s", a->list[i]); 185 fprintf(stderr, "\n"); 186 } 187 if ((pid = fork()) == -1) 188 fatal("do_local_cmd: fork: %s", strerror(errno)); 189 190 if (pid == 0) { 191 execvp(a->list[0], a->list); 192 perror(a->list[0]); 193 exit(1); 194 } 195 196 do_cmd_pid = pid; 197 signal(SIGTERM, killchild); 198 signal(SIGINT, killchild); 199 signal(SIGHUP, killchild); 200 201 while (waitpid(pid, &status, 0) == -1) 202 if (errno != EINTR) 203 fatal("do_local_cmd: waitpid: %s", strerror(errno)); 204 205 do_cmd_pid = -1; 206 207 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 208 return (-1); 209 210 return (0); 211 } 212 213 /* 214 * This function executes the given command as the specified user on the 215 * given host. This returns < 0 if execution fails, and >= 0 otherwise. This 216 * assigns the input and output file descriptors on success. 217 */ 218 219 int 220 do_cmd(char *host, char *remuser, int port, char *cmd, int *fdin, int *fdout) 221 { 222 int pin[2], pout[2], reserved[2]; 223 224 if (verbose_mode) 225 fmprintf(stderr, 226 "Executing: program %s host %s, user %s, command %s\n", 227 ssh_program, host, 228 remuser ? remuser : "(unspecified)", cmd); 229 230 if (port == -1) 231 port = sshport; 232 233 /* 234 * Reserve two descriptors so that the real pipes won't get 235 * descriptors 0 and 1 because that will screw up dup2 below. 236 */ 237 if (pipe(reserved) < 0) 238 fatal("pipe: %s", strerror(errno)); 239 240 /* Create a socket pair for communicating with ssh. */ 241 if (pipe(pin) < 0) 242 fatal("pipe: %s", strerror(errno)); 243 if (pipe(pout) < 0) 244 fatal("pipe: %s", strerror(errno)); 245 246 /* Free the reserved descriptors. */ 247 close(reserved[0]); 248 close(reserved[1]); 249 250 signal(SIGTSTP, suspchild); 251 signal(SIGTTIN, suspchild); 252 signal(SIGTTOU, suspchild); 253 254 /* Fork a child to execute the command on the remote host using ssh. */ 255 do_cmd_pid = fork(); 256 if (do_cmd_pid == 0) { 257 /* Child. */ 258 close(pin[1]); 259 close(pout[0]); 260 dup2(pin[0], 0); 261 dup2(pout[1], 1); 262 close(pin[0]); 263 close(pout[1]); 264 265 replacearg(&args, 0, "%s", ssh_program); 266 if (port != -1) { 267 addargs(&args, "-p"); 268 addargs(&args, "%d", port); 269 } 270 if (remuser != NULL) { 271 addargs(&args, "-l"); 272 addargs(&args, "%s", remuser); 273 } 274 addargs(&args, "--"); 275 addargs(&args, "%s", host); 276 addargs(&args, "%s", cmd); 277 278 execvp(ssh_program, args.list); 279 perror(ssh_program); 280 exit(1); 281 } else if (do_cmd_pid == -1) { 282 fatal("fork: %s", strerror(errno)); 283 } 284 /* Parent. Close the other side, and return the local side. */ 285 close(pin[0]); 286 *fdout = pin[1]; 287 close(pout[1]); 288 *fdin = pout[0]; 289 signal(SIGTERM, killchild); 290 signal(SIGINT, killchild); 291 signal(SIGHUP, killchild); 292 return 0; 293 } 294 295 /* 296 * This function executes a command similar to do_cmd(), but expects the 297 * input and output descriptors to be setup by a previous call to do_cmd(). 298 * This way the input and output of two commands can be connected. 299 */ 300 int 301 do_cmd2(char *host, char *remuser, int port, char *cmd, int fdin, int fdout) 302 { 303 pid_t pid; 304 int status; 305 306 if (verbose_mode) 307 fmprintf(stderr, 308 "Executing: 2nd program %s host %s, user %s, command %s\n", 309 ssh_program, host, 310 remuser ? remuser : "(unspecified)", cmd); 311 312 if (port == -1) 313 port = sshport; 314 315 /* Fork a child to execute the command on the remote host using ssh. */ 316 pid = fork(); 317 if (pid == 0) { 318 dup2(fdin, 0); 319 dup2(fdout, 1); 320 321 replacearg(&args, 0, "%s", ssh_program); 322 if (port != -1) { 323 addargs(&args, "-p"); 324 addargs(&args, "%d", port); 325 } 326 if (remuser != NULL) { 327 addargs(&args, "-l"); 328 addargs(&args, "%s", remuser); 329 } 330 addargs(&args, "--"); 331 addargs(&args, "%s", host); 332 addargs(&args, "%s", cmd); 333 334 execvp(ssh_program, args.list); 335 perror(ssh_program); 336 exit(1); 337 } else if (pid == -1) { 338 fatal("fork: %s", strerror(errno)); 339 } 340 while (waitpid(pid, &status, 0) == -1) 341 if (errno != EINTR) 342 fatal("do_cmd2: waitpid: %s", strerror(errno)); 343 return 0; 344 } 345 346 typedef struct { 347 size_t cnt; 348 char *buf; 349 } BUF; 350 351 BUF *allocbuf(BUF *, int, int); 352 void lostconn(int); 353 int okname(char *); 354 void run_err(const char *,...); 355 void verifydir(char *); 356 357 struct passwd *pwd; 358 uid_t userid; 359 int errs, remin, remout; 360 int pflag, iamremote, iamrecursive, targetshouldbedirectory; 361 362 #define CMDNEEDS 64 363 char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */ 364 365 int response(void); 366 void rsource(char *, struct stat *); 367 void sink(int, char *[]); 368 void source(int, char *[]); 369 void tolocal(int, char *[]); 370 void toremote(int, char *[]); 371 void usage(void); 372 373 int 374 main(int argc, char **argv) 375 { 376 int ch, fflag, tflag, status, n; 377 char **newargv; 378 const char *errstr; 379 extern char *optarg; 380 extern int optind; 381 382 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 383 sanitise_stdfd(); 384 385 setlocale(LC_CTYPE, ""); 386 387 /* Copy argv, because we modify it */ 388 newargv = xcalloc(MAXIMUM(argc + 1, 1), sizeof(*newargv)); 389 for (n = 0; n < argc; n++) 390 newargv[n] = xstrdup(argv[n]); 391 argv = newargv; 392 393 memset(&args, '\0', sizeof(args)); 394 memset(&remote_remote_args, '\0', sizeof(remote_remote_args)); 395 args.list = remote_remote_args.list = NULL; 396 addargs(&args, "%s", ssh_program); 397 addargs(&args, "-x"); 398 addargs(&args, "-oForwardAgent=no"); 399 addargs(&args, "-oPermitLocalCommand=no"); 400 addargs(&args, "-oClearAllForwardings=yes"); 401 addargs(&args, "-oRemoteCommand=none"); 402 addargs(&args, "-oRequestTTY=no"); 403 404 fflag = tflag = 0; 405 while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1) 406 switch (ch) { 407 /* User-visible flags. */ 408 case '1': 409 fatal("SSH protocol v.1 is no longer supported"); 410 break; 411 case '2': 412 /* Ignored */ 413 break; 414 case '4': 415 case '6': 416 case 'C': 417 addargs(&args, "-%c", ch); 418 addargs(&remote_remote_args, "-%c", ch); 419 break; 420 case '3': 421 throughlocal = 1; 422 break; 423 case 'o': 424 case 'c': 425 case 'i': 426 case 'F': 427 addargs(&remote_remote_args, "-%c", ch); 428 addargs(&remote_remote_args, "%s", optarg); 429 addargs(&args, "-%c", ch); 430 addargs(&args, "%s", optarg); 431 break; 432 case 'P': 433 sshport = a2port(optarg); 434 if (sshport <= 0) 435 fatal("bad port \"%s\"\n", optarg); 436 break; 437 case 'B': 438 addargs(&remote_remote_args, "-oBatchmode=yes"); 439 addargs(&args, "-oBatchmode=yes"); 440 break; 441 case 'l': 442 limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024, 443 &errstr); 444 if (errstr != NULL) 445 usage(); 446 limit_kbps *= 1024; /* kbps */ 447 bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN); 448 break; 449 case 'p': 450 pflag = 1; 451 break; 452 case 'r': 453 iamrecursive = 1; 454 break; 455 case 'S': 456 ssh_program = xstrdup(optarg); 457 break; 458 case 'v': 459 addargs(&args, "-v"); 460 addargs(&remote_remote_args, "-v"); 461 verbose_mode = 1; 462 break; 463 case 'q': 464 addargs(&args, "-q"); 465 addargs(&remote_remote_args, "-q"); 466 showprogress = 0; 467 break; 468 469 /* Server options. */ 470 case 'd': 471 targetshouldbedirectory = 1; 472 break; 473 case 'f': /* "from" */ 474 iamremote = 1; 475 fflag = 1; 476 break; 477 case 't': /* "to" */ 478 iamremote = 1; 479 tflag = 1; 480 break; 481 default: 482 usage(); 483 } 484 argc -= optind; 485 argv += optind; 486 487 if ((pwd = getpwuid(userid = getuid())) == NULL) 488 fatal("unknown user %u", (u_int) userid); 489 490 if (!isatty(STDOUT_FILENO)) 491 showprogress = 0; 492 493 if (pflag) { 494 /* Cannot pledge: -p allows setuid/setgid files... */ 495 } else { 496 if (pledge("stdio rpath wpath cpath fattr tty proc exec", 497 NULL) == -1) { 498 perror("pledge"); 499 exit(1); 500 } 501 } 502 503 remin = STDIN_FILENO; 504 remout = STDOUT_FILENO; 505 506 if (fflag) { 507 /* Follow "protocol", send data. */ 508 (void) response(); 509 source(argc, argv); 510 exit(errs != 0); 511 } 512 if (tflag) { 513 /* Receive data. */ 514 sink(argc, argv); 515 exit(errs != 0); 516 } 517 if (argc < 2) 518 usage(); 519 if (argc > 2) 520 targetshouldbedirectory = 1; 521 522 remin = remout = -1; 523 do_cmd_pid = -1; 524 /* Command to be executed on remote system using "ssh". */ 525 (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s", 526 verbose_mode ? " -v" : "", 527 iamrecursive ? " -r" : "", pflag ? " -p" : "", 528 targetshouldbedirectory ? " -d" : ""); 529 530 (void) signal(SIGPIPE, lostconn); 531 532 if (colon(argv[argc - 1])) /* Dest is remote host. */ 533 toremote(argc, argv); 534 else { 535 if (targetshouldbedirectory) 536 verifydir(argv[argc - 1]); 537 tolocal(argc, argv); /* Dest is local host. */ 538 } 539 /* 540 * Finally check the exit status of the ssh process, if one was forked 541 * and no error has occurred yet 542 */ 543 if (do_cmd_pid != -1 && errs == 0) { 544 if (remin != -1) 545 (void) close(remin); 546 if (remout != -1) 547 (void) close(remout); 548 if (waitpid(do_cmd_pid, &status, 0) == -1) 549 errs = 1; 550 else { 551 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 552 errs = 1; 553 } 554 } 555 exit(errs != 0); 556 } 557 558 /* Callback from atomicio6 to update progress meter and limit bandwidth */ 559 static int 560 scpio(void *_cnt, size_t s) 561 { 562 off_t *cnt = (off_t *)_cnt; 563 564 *cnt += s; 565 if (limit_kbps > 0) 566 bandwidth_limit(&bwlimit, s); 567 return 0; 568 } 569 570 static int 571 do_times(int fd, int verb, const struct stat *sb) 572 { 573 /* strlen(2^64) == 20; strlen(10^6) == 7 */ 574 char buf[(20 + 7 + 2) * 2 + 2]; 575 576 (void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n", 577 (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime), 578 (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime)); 579 if (verb) { 580 fprintf(stderr, "File mtime %lld atime %lld\n", 581 (long long)sb->st_mtime, (long long)sb->st_atime); 582 fprintf(stderr, "Sending file timestamps: %s", buf); 583 } 584 (void) atomicio(vwrite, fd, buf, strlen(buf)); 585 return (response()); 586 } 587 588 static int 589 parse_scp_uri(const char *uri, char **userp, char **hostp, int *portp, 590 char **pathp) 591 { 592 int r; 593 594 r = parse_uri("scp", uri, userp, hostp, portp, pathp); 595 if (r == 0 && *pathp == NULL) 596 *pathp = xstrdup("."); 597 return r; 598 } 599 600 void 601 toremote(int argc, char **argv) 602 { 603 char *suser = NULL, *host = NULL, *src = NULL; 604 char *bp, *tuser, *thost, *targ; 605 int sport = -1, tport = -1; 606 arglist alist; 607 int i, r; 608 u_int j; 609 610 memset(&alist, '\0', sizeof(alist)); 611 alist.list = NULL; 612 613 /* Parse target */ 614 r = parse_scp_uri(argv[argc - 1], &tuser, &thost, &tport, &targ); 615 if (r == -1) { 616 fmprintf(stderr, "%s: invalid uri\n", argv[argc - 1]); 617 ++errs; 618 goto out; 619 } 620 if (r != 0) { 621 if (parse_user_host_path(argv[argc - 1], &tuser, &thost, 622 &targ) == -1) { 623 fmprintf(stderr, "%s: invalid target\n", argv[argc - 1]); 624 ++errs; 625 goto out; 626 } 627 } 628 if (tuser != NULL && !okname(tuser)) { 629 ++errs; 630 goto out; 631 } 632 633 /* Parse source files */ 634 for (i = 0; i < argc - 1; i++) { 635 free(suser); 636 free(host); 637 free(src); 638 r = parse_scp_uri(argv[i], &suser, &host, &sport, &src); 639 if (r == -1) { 640 fmprintf(stderr, "%s: invalid uri\n", argv[i]); 641 ++errs; 642 continue; 643 } 644 if (r != 0) { 645 parse_user_host_path(argv[i], &suser, &host, &src); 646 } 647 if (suser != NULL && !okname(suser)) { 648 ++errs; 649 continue; 650 } 651 if (host && throughlocal) { /* extended remote to remote */ 652 xasprintf(&bp, "%s -f %s%s", cmd, 653 *src == '-' ? "-- " : "", src); 654 if (do_cmd(host, suser, sport, bp, &remin, &remout) < 0) 655 exit(1); 656 free(bp); 657 xasprintf(&bp, "%s -t %s%s", cmd, 658 *targ == '-' ? "-- " : "", targ); 659 if (do_cmd2(thost, tuser, tport, bp, remin, remout) < 0) 660 exit(1); 661 free(bp); 662 (void) close(remin); 663 (void) close(remout); 664 remin = remout = -1; 665 } else if (host) { /* standard remote to remote */ 666 if (tport != -1 && tport != SSH_DEFAULT_PORT) { 667 /* This would require the remote support URIs */ 668 fatal("target port not supported with two " 669 "remote hosts without the -3 option"); 670 } 671 672 freeargs(&alist); 673 addargs(&alist, "%s", ssh_program); 674 addargs(&alist, "-x"); 675 addargs(&alist, "-oClearAllForwardings=yes"); 676 addargs(&alist, "-n"); 677 for (j = 0; j < remote_remote_args.num; j++) { 678 addargs(&alist, "%s", 679 remote_remote_args.list[j]); 680 } 681 682 if (sport != -1) { 683 addargs(&alist, "-p"); 684 addargs(&alist, "%d", sport); 685 } 686 if (suser) { 687 addargs(&alist, "-l"); 688 addargs(&alist, "%s", suser); 689 } 690 addargs(&alist, "--"); 691 addargs(&alist, "%s", host); 692 addargs(&alist, "%s", cmd); 693 addargs(&alist, "%s", src); 694 addargs(&alist, "%s%s%s:%s", 695 tuser ? tuser : "", tuser ? "@" : "", 696 thost, targ); 697 if (do_local_cmd(&alist) != 0) 698 errs = 1; 699 } else { /* local to remote */ 700 if (remin == -1) { 701 xasprintf(&bp, "%s -t %s%s", cmd, 702 *targ == '-' ? "-- " : "", targ); 703 if (do_cmd(thost, tuser, tport, bp, &remin, 704 &remout) < 0) 705 exit(1); 706 if (response() < 0) 707 exit(1); 708 free(bp); 709 } 710 source(1, argv + i); 711 } 712 } 713 out: 714 free(tuser); 715 free(thost); 716 free(targ); 717 free(suser); 718 free(host); 719 free(src); 720 } 721 722 void 723 tolocal(int argc, char **argv) 724 { 725 char *bp, *host = NULL, *src = NULL, *suser = NULL; 726 arglist alist; 727 int i, r, sport = -1; 728 729 memset(&alist, '\0', sizeof(alist)); 730 alist.list = NULL; 731 732 for (i = 0; i < argc - 1; i++) { 733 free(suser); 734 free(host); 735 free(src); 736 r = parse_scp_uri(argv[i], &suser, &host, &sport, &src); 737 if (r == -1) { 738 fmprintf(stderr, "%s: invalid uri\n", argv[i]); 739 ++errs; 740 continue; 741 } 742 if (r != 0) 743 parse_user_host_path(argv[i], &suser, &host, &src); 744 if (suser != NULL && !okname(suser)) { 745 ++errs; 746 continue; 747 } 748 if (!host) { /* Local to local. */ 749 freeargs(&alist); 750 addargs(&alist, "%s", _PATH_CP); 751 if (iamrecursive) 752 addargs(&alist, "-r"); 753 if (pflag) 754 addargs(&alist, "-p"); 755 addargs(&alist, "--"); 756 addargs(&alist, "%s", argv[i]); 757 addargs(&alist, "%s", argv[argc-1]); 758 if (do_local_cmd(&alist)) 759 ++errs; 760 continue; 761 } 762 /* Remote to local. */ 763 xasprintf(&bp, "%s -f %s%s", 764 cmd, *src == '-' ? "-- " : "", src); 765 if (do_cmd(host, suser, sport, bp, &remin, &remout) < 0) { 766 free(bp); 767 ++errs; 768 continue; 769 } 770 free(bp); 771 sink(1, argv + argc - 1); 772 (void) close(remin); 773 remin = remout = -1; 774 } 775 free(suser); 776 free(host); 777 free(src); 778 } 779 780 void 781 source(int argc, char **argv) 782 { 783 struct stat stb; 784 static BUF buffer; 785 BUF *bp; 786 off_t i, statbytes; 787 size_t amt, nr; 788 int fd = -1, haderr, indx; 789 char *last, *name, buf[2048], encname[PATH_MAX]; 790 int len; 791 792 for (indx = 0; indx < argc; ++indx) { 793 name = argv[indx]; 794 statbytes = 0; 795 len = strlen(name); 796 while (len > 1 && name[len-1] == '/') 797 name[--len] = '\0'; 798 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0) 799 goto syserr; 800 if (strchr(name, '\n') != NULL) { 801 strnvis(encname, name, sizeof(encname), VIS_NL); 802 name = encname; 803 } 804 if (fstat(fd, &stb) < 0) { 805 syserr: run_err("%s: %s", name, strerror(errno)); 806 goto next; 807 } 808 if (stb.st_size < 0) { 809 run_err("%s: %s", name, "Negative file size"); 810 goto next; 811 } 812 unset_nonblock(fd); 813 switch (stb.st_mode & S_IFMT) { 814 case S_IFREG: 815 break; 816 case S_IFDIR: 817 if (iamrecursive) { 818 rsource(name, &stb); 819 goto next; 820 } 821 /* FALLTHROUGH */ 822 default: 823 run_err("%s: not a regular file", name); 824 goto next; 825 } 826 if ((last = strrchr(name, '/')) == NULL) 827 last = name; 828 else 829 ++last; 830 curfile = last; 831 if (pflag) { 832 if (do_times(remout, verbose_mode, &stb) < 0) 833 goto next; 834 } 835 #define FILEMODEMASK (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO) 836 snprintf(buf, sizeof buf, "C%04o %lld %s\n", 837 (u_int) (stb.st_mode & FILEMODEMASK), 838 (long long)stb.st_size, last); 839 if (verbose_mode) 840 fmprintf(stderr, "Sending file modes: %s", buf); 841 (void) atomicio(vwrite, remout, buf, strlen(buf)); 842 if (response() < 0) 843 goto next; 844 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) { 845 next: if (fd != -1) { 846 (void) close(fd); 847 fd = -1; 848 } 849 continue; 850 } 851 if (showprogress) 852 start_progress_meter(curfile, stb.st_size, &statbytes); 853 set_nonblock(remout); 854 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) { 855 amt = bp->cnt; 856 if (i + (off_t)amt > stb.st_size) 857 amt = stb.st_size - i; 858 if (!haderr) { 859 if ((nr = atomicio(read, fd, 860 bp->buf, amt)) != amt) { 861 haderr = errno; 862 memset(bp->buf + nr, 0, amt - nr); 863 } 864 } 865 /* Keep writing after error to retain sync */ 866 if (haderr) { 867 (void)atomicio(vwrite, remout, bp->buf, amt); 868 memset(bp->buf, 0, amt); 869 continue; 870 } 871 if (atomicio6(vwrite, remout, bp->buf, amt, scpio, 872 &statbytes) != amt) 873 haderr = errno; 874 } 875 unset_nonblock(remout); 876 877 if (fd != -1) { 878 if (close(fd) < 0 && !haderr) 879 haderr = errno; 880 fd = -1; 881 } 882 if (!haderr) 883 (void) atomicio(vwrite, remout, "", 1); 884 else 885 run_err("%s: %s", name, strerror(haderr)); 886 (void) response(); 887 if (showprogress) 888 stop_progress_meter(); 889 } 890 } 891 892 void 893 rsource(char *name, struct stat *statp) 894 { 895 DIR *dirp; 896 struct dirent *dp; 897 char *last, *vect[1], path[PATH_MAX]; 898 899 if (!(dirp = opendir(name))) { 900 run_err("%s: %s", name, strerror(errno)); 901 return; 902 } 903 last = strrchr(name, '/'); 904 if (last == NULL) 905 last = name; 906 else 907 last++; 908 if (pflag) { 909 if (do_times(remout, verbose_mode, statp) < 0) { 910 closedir(dirp); 911 return; 912 } 913 } 914 (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n", 915 (u_int) (statp->st_mode & FILEMODEMASK), 0, last); 916 if (verbose_mode) 917 fmprintf(stderr, "Entering directory: %s", path); 918 (void) atomicio(vwrite, remout, path, strlen(path)); 919 if (response() < 0) { 920 closedir(dirp); 921 return; 922 } 923 while ((dp = readdir(dirp)) != NULL) { 924 if (dp->d_ino == 0) 925 continue; 926 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) 927 continue; 928 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) { 929 run_err("%s/%s: name too long", name, dp->d_name); 930 continue; 931 } 932 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name); 933 vect[0] = path; 934 source(1, vect); 935 } 936 (void) closedir(dirp); 937 (void) atomicio(vwrite, remout, "E\n", 2); 938 (void) response(); 939 } 940 941 #define TYPE_OVERFLOW(type, val) \ 942 ((sizeof(type) == 4 && (val) > INT32_MAX) || \ 943 (sizeof(type) == 8 && (val) > INT64_MAX) || \ 944 (sizeof(type) != 4 && sizeof(type) != 8)) 945 946 void 947 sink(int argc, char **argv) 948 { 949 static BUF buffer; 950 struct stat stb; 951 enum { 952 YES, NO, DISPLAYED 953 } wrerr; 954 BUF *bp; 955 off_t i; 956 size_t j, count; 957 int amt, exists, first, ofd; 958 mode_t mode, omode, mask; 959 off_t size, statbytes; 960 unsigned long long ull; 961 int setimes, targisdir, wrerrno = 0; 962 char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048]; 963 struct timeval tv[2]; 964 965 #define atime tv[0] 966 #define mtime tv[1] 967 #define SCREWUP(str) { why = str; goto screwup; } 968 969 if (TYPE_OVERFLOW(time_t, 0) || TYPE_OVERFLOW(off_t, 0)) 970 SCREWUP("Unexpected off_t/time_t size"); 971 972 setimes = targisdir = 0; 973 mask = umask(0); 974 if (!pflag) 975 (void) umask(mask); 976 if (argc != 1) { 977 run_err("ambiguous target"); 978 exit(1); 979 } 980 targ = *argv; 981 if (targetshouldbedirectory) 982 verifydir(targ); 983 984 (void) atomicio(vwrite, remout, "", 1); 985 if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode)) 986 targisdir = 1; 987 for (first = 1;; first = 0) { 988 cp = buf; 989 if (atomicio(read, remin, cp, 1) != 1) 990 return; 991 if (*cp++ == '\n') 992 SCREWUP("unexpected <newline>"); 993 do { 994 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) 995 SCREWUP("lost connection"); 996 *cp++ = ch; 997 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n'); 998 *cp = 0; 999 if (verbose_mode) 1000 fmprintf(stderr, "Sink: %s", buf); 1001 1002 if (buf[0] == '\01' || buf[0] == '\02') { 1003 if (iamremote == 0) { 1004 (void) snmprintf(visbuf, sizeof(visbuf), 1005 NULL, "%s", buf + 1); 1006 (void) atomicio(vwrite, STDERR_FILENO, 1007 visbuf, strlen(visbuf)); 1008 } 1009 if (buf[0] == '\02') 1010 exit(1); 1011 ++errs; 1012 continue; 1013 } 1014 if (buf[0] == 'E') { 1015 (void) atomicio(vwrite, remout, "", 1); 1016 return; 1017 } 1018 if (ch == '\n') 1019 *--cp = 0; 1020 1021 cp = buf; 1022 if (*cp == 'T') { 1023 setimes++; 1024 cp++; 1025 if (!isdigit((unsigned char)*cp)) 1026 SCREWUP("mtime.sec not present"); 1027 ull = strtoull(cp, &cp, 10); 1028 if (!cp || *cp++ != ' ') 1029 SCREWUP("mtime.sec not delimited"); 1030 if (TYPE_OVERFLOW(time_t, ull)) 1031 setimes = 0; /* out of range */ 1032 mtime.tv_sec = ull; 1033 mtime.tv_usec = strtol(cp, &cp, 10); 1034 if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 || 1035 mtime.tv_usec > 999999) 1036 SCREWUP("mtime.usec not delimited"); 1037 if (!isdigit((unsigned char)*cp)) 1038 SCREWUP("atime.sec not present"); 1039 ull = strtoull(cp, &cp, 10); 1040 if (!cp || *cp++ != ' ') 1041 SCREWUP("atime.sec not delimited"); 1042 if (TYPE_OVERFLOW(time_t, ull)) 1043 setimes = 0; /* out of range */ 1044 atime.tv_sec = ull; 1045 atime.tv_usec = strtol(cp, &cp, 10); 1046 if (!cp || *cp++ != '\0' || atime.tv_usec < 0 || 1047 atime.tv_usec > 999999) 1048 SCREWUP("atime.usec not delimited"); 1049 (void) atomicio(vwrite, remout, "", 1); 1050 continue; 1051 } 1052 if (*cp != 'C' && *cp != 'D') { 1053 /* 1054 * Check for the case "rcp remote:foo\* local:bar". 1055 * In this case, the line "No match." can be returned 1056 * by the shell before the rcp command on the remote is 1057 * executed so the ^Aerror_message convention isn't 1058 * followed. 1059 */ 1060 if (first) { 1061 run_err("%s", cp); 1062 exit(1); 1063 } 1064 SCREWUP("expected control record"); 1065 } 1066 mode = 0; 1067 for (++cp; cp < buf + 5; cp++) { 1068 if (*cp < '0' || *cp > '7') 1069 SCREWUP("bad mode"); 1070 mode = (mode << 3) | (*cp - '0'); 1071 } 1072 if (!pflag) 1073 mode &= ~mask; 1074 if (*cp++ != ' ') 1075 SCREWUP("mode not delimited"); 1076 1077 if (!isdigit((unsigned char)*cp)) 1078 SCREWUP("size not present"); 1079 ull = strtoull(cp, &cp, 10); 1080 if (!cp || *cp++ != ' ') 1081 SCREWUP("size not delimited"); 1082 if (TYPE_OVERFLOW(off_t, ull)) 1083 SCREWUP("size out of range"); 1084 size = (off_t)ull; 1085 1086 if (*cp == '\0' || strchr(cp, '/') != NULL || 1087 strcmp(cp, ".") == 0 || strcmp(cp, "..") == 0) { 1088 run_err("error: unexpected filename: %s", cp); 1089 exit(1); 1090 } 1091 if (targisdir) { 1092 static char *namebuf; 1093 static size_t cursize; 1094 size_t need; 1095 1096 need = strlen(targ) + strlen(cp) + 250; 1097 if (need > cursize) { 1098 free(namebuf); 1099 namebuf = xmalloc(need); 1100 cursize = need; 1101 } 1102 (void) snprintf(namebuf, need, "%s%s%s", targ, 1103 strcmp(targ, "/") ? "/" : "", cp); 1104 np = namebuf; 1105 } else 1106 np = targ; 1107 curfile = cp; 1108 exists = stat(np, &stb) == 0; 1109 if (buf[0] == 'D') { 1110 int mod_flag = pflag; 1111 if (!iamrecursive) 1112 SCREWUP("received directory without -r"); 1113 if (exists) { 1114 if (!S_ISDIR(stb.st_mode)) { 1115 errno = ENOTDIR; 1116 goto bad; 1117 } 1118 if (pflag) 1119 (void) chmod(np, mode); 1120 } else { 1121 /* Handle copying from a read-only 1122 directory */ 1123 mod_flag = 1; 1124 if (mkdir(np, mode | S_IRWXU) < 0) 1125 goto bad; 1126 } 1127 vect[0] = xstrdup(np); 1128 sink(1, vect); 1129 if (setimes) { 1130 setimes = 0; 1131 if (utimes(vect[0], tv) < 0) 1132 run_err("%s: set times: %s", 1133 vect[0], strerror(errno)); 1134 } 1135 if (mod_flag) 1136 (void) chmod(vect[0], mode); 1137 free(vect[0]); 1138 continue; 1139 } 1140 omode = mode; 1141 mode |= S_IWUSR; 1142 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) { 1143 bad: run_err("%s: %s", np, strerror(errno)); 1144 continue; 1145 } 1146 (void) atomicio(vwrite, remout, "", 1); 1147 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) { 1148 (void) close(ofd); 1149 continue; 1150 } 1151 cp = bp->buf; 1152 wrerr = NO; 1153 1154 statbytes = 0; 1155 if (showprogress) 1156 start_progress_meter(curfile, size, &statbytes); 1157 set_nonblock(remin); 1158 for (count = i = 0; i < size; i += bp->cnt) { 1159 amt = bp->cnt; 1160 if (i + amt > size) 1161 amt = size - i; 1162 count += amt; 1163 do { 1164 j = atomicio6(read, remin, cp, amt, 1165 scpio, &statbytes); 1166 if (j == 0) { 1167 run_err("%s", j != EPIPE ? 1168 strerror(errno) : 1169 "dropped connection"); 1170 exit(1); 1171 } 1172 amt -= j; 1173 cp += j; 1174 } while (amt > 0); 1175 1176 if (count == bp->cnt) { 1177 /* Keep reading so we stay sync'd up. */ 1178 if (wrerr == NO) { 1179 if (atomicio(vwrite, ofd, bp->buf, 1180 count) != count) { 1181 wrerr = YES; 1182 wrerrno = errno; 1183 } 1184 } 1185 count = 0; 1186 cp = bp->buf; 1187 } 1188 } 1189 unset_nonblock(remin); 1190 if (count != 0 && wrerr == NO && 1191 atomicio(vwrite, ofd, bp->buf, count) != count) { 1192 wrerr = YES; 1193 wrerrno = errno; 1194 } 1195 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) && 1196 ftruncate(ofd, size) != 0) { 1197 run_err("%s: truncate: %s", np, strerror(errno)); 1198 wrerr = DISPLAYED; 1199 } 1200 if (pflag) { 1201 if (exists || omode != mode) 1202 if (fchmod(ofd, omode)) { 1203 run_err("%s: set mode: %s", 1204 np, strerror(errno)); 1205 wrerr = DISPLAYED; 1206 } 1207 } else { 1208 if (!exists && omode != mode) 1209 if (fchmod(ofd, omode & ~mask)) { 1210 run_err("%s: set mode: %s", 1211 np, strerror(errno)); 1212 wrerr = DISPLAYED; 1213 } 1214 } 1215 if (close(ofd) == -1) { 1216 wrerr = YES; 1217 wrerrno = errno; 1218 } 1219 (void) response(); 1220 if (showprogress) 1221 stop_progress_meter(); 1222 if (setimes && wrerr == NO) { 1223 setimes = 0; 1224 if (utimes(np, tv) < 0) { 1225 run_err("%s: set times: %s", 1226 np, strerror(errno)); 1227 wrerr = DISPLAYED; 1228 } 1229 } 1230 switch (wrerr) { 1231 case YES: 1232 run_err("%s: %s", np, strerror(wrerrno)); 1233 break; 1234 case NO: 1235 (void) atomicio(vwrite, remout, "", 1); 1236 break; 1237 case DISPLAYED: 1238 break; 1239 } 1240 } 1241 screwup: 1242 run_err("protocol error: %s", why); 1243 exit(1); 1244 } 1245 1246 int 1247 response(void) 1248 { 1249 char ch, *cp, resp, rbuf[2048], visbuf[2048]; 1250 1251 if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp)) 1252 lostconn(0); 1253 1254 cp = rbuf; 1255 switch (resp) { 1256 case 0: /* ok */ 1257 return (0); 1258 default: 1259 *cp++ = resp; 1260 /* FALLTHROUGH */ 1261 case 1: /* error, followed by error msg */ 1262 case 2: /* fatal error, "" */ 1263 do { 1264 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) 1265 lostconn(0); 1266 *cp++ = ch; 1267 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n'); 1268 1269 if (!iamremote) { 1270 cp[-1] = '\0'; 1271 (void) snmprintf(visbuf, sizeof(visbuf), 1272 NULL, "%s\n", rbuf); 1273 (void) atomicio(vwrite, STDERR_FILENO, 1274 visbuf, strlen(visbuf)); 1275 } 1276 ++errs; 1277 if (resp == 1) 1278 return (-1); 1279 exit(1); 1280 } 1281 /* NOTREACHED */ 1282 } 1283 1284 void 1285 usage(void) 1286 { 1287 (void) fprintf(stderr, 1288 "usage: scp [-346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n" 1289 " [-l limit] [-o ssh_option] [-P port] [-S program] source ... target\n"); 1290 exit(1); 1291 } 1292 1293 void 1294 run_err(const char *fmt,...) 1295 { 1296 static FILE *fp; 1297 va_list ap; 1298 1299 ++errs; 1300 if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) { 1301 (void) fprintf(fp, "%c", 0x01); 1302 (void) fprintf(fp, "scp: "); 1303 va_start(ap, fmt); 1304 (void) vfprintf(fp, fmt, ap); 1305 va_end(ap); 1306 (void) fprintf(fp, "\n"); 1307 (void) fflush(fp); 1308 } 1309 1310 if (!iamremote) { 1311 va_start(ap, fmt); 1312 vfmprintf(stderr, fmt, ap); 1313 va_end(ap); 1314 fprintf(stderr, "\n"); 1315 } 1316 } 1317 1318 void 1319 verifydir(char *cp) 1320 { 1321 struct stat stb; 1322 1323 if (!stat(cp, &stb)) { 1324 if (S_ISDIR(stb.st_mode)) 1325 return; 1326 errno = ENOTDIR; 1327 } 1328 run_err("%s: %s", cp, strerror(errno)); 1329 killchild(0); 1330 } 1331 1332 int 1333 okname(char *cp0) 1334 { 1335 int c; 1336 char *cp; 1337 1338 cp = cp0; 1339 do { 1340 c = (int)*cp; 1341 if (c & 0200) 1342 goto bad; 1343 if (!isalpha(c) && !isdigit((unsigned char)c)) { 1344 switch (c) { 1345 case '\'': 1346 case '"': 1347 case '`': 1348 case ' ': 1349 case '#': 1350 goto bad; 1351 default: 1352 break; 1353 } 1354 } 1355 } while (*++cp); 1356 return (1); 1357 1358 bad: fmprintf(stderr, "%s: invalid user name\n", cp0); 1359 return (0); 1360 } 1361 1362 BUF * 1363 allocbuf(BUF *bp, int fd, int blksize) 1364 { 1365 size_t size; 1366 struct stat stb; 1367 1368 if (fstat(fd, &stb) < 0) { 1369 run_err("fstat: %s", strerror(errno)); 1370 return (0); 1371 } 1372 size = ROUNDUP(stb.st_blksize, blksize); 1373 if (size == 0) 1374 size = blksize; 1375 if (bp->cnt >= size) 1376 return (bp); 1377 bp->buf = xrecallocarray(bp->buf, bp->cnt, size, 1); 1378 bp->cnt = size; 1379 return (bp); 1380 } 1381 1382 void 1383 lostconn(int signo) 1384 { 1385 if (!iamremote) 1386 (void)write(STDERR_FILENO, "lost connection\n", 16); 1387 if (signo) 1388 _exit(1); 1389 else 1390 exit(1); 1391 } 1392