1 /* $NetBSD: scp.c,v 1.13 2016/03/11 01:55:00 christos Exp $ */ 2 /* $OpenBSD: scp.c,v 1.184 2015/11/27 00:49:31 deraadt Exp $ */ 3 4 /* 5 * scp - secure remote copy. This is basically patched BSD rcp which 6 * uses ssh to do the data transfer (instead of using rcmd). 7 * 8 * NOTE: This version should NOT be suid root. (This uses ssh to 9 * do the transfer and ssh has the necessary privileges.) 10 * 11 * 1995 Timo Rinne <tri@iki.fi>, Tatu Ylonen <ylo@cs.hut.fi> 12 * 13 * As far as I am concerned, the code I have written for this software 14 * can be used freely for any purpose. Any derived versions of this 15 * software must be clearly marked as such, and if the derived work is 16 * incompatible with the protocol description in the RFC file, it must be 17 * called by a name other than "ssh" or "Secure Shell". 18 */ 19 /* 20 * Copyright (c) 1999 Theo de Raadt. All rights reserved. 21 * Copyright (c) 1999 Aaron Campbell. All rights reserved. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the above copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 33 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 34 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 35 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 36 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 37 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 41 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42 */ 43 44 /* 45 * Parts from: 46 * 47 * Copyright (c) 1983, 1990, 1992, 1993, 1995 48 * The Regents of the University of California. All rights reserved. 49 * 50 * Redistribution and use in source and binary forms, with or without 51 * modification, are permitted provided that the following conditions 52 * are met: 53 * 1. Redistributions of source code must retain the above copyright 54 * notice, this list of conditions and the following disclaimer. 55 * 2. Redistributions in binary form must reproduce the above copyright 56 * notice, this list of conditions and the following disclaimer in the 57 * documentation and/or other materials provided with the distribution. 58 * 3. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 */ 75 76 #include "includes.h" 77 __RCSID("$NetBSD: scp.c,v 1.13 2016/03/11 01:55:00 christos Exp $"); 78 #include <sys/param.h> /* roundup MAX */ 79 #include <sys/types.h> 80 #include <sys/poll.h> 81 #include <sys/wait.h> 82 #include <sys/stat.h> 83 #include <sys/time.h> 84 #include <sys/uio.h> 85 86 #include <ctype.h> 87 #include <dirent.h> 88 #include <errno.h> 89 #include <fcntl.h> 90 #include <pwd.h> 91 #include <signal.h> 92 #include <stdarg.h> 93 #include <stdio.h> 94 #include <stdlib.h> 95 #include <string.h> 96 #include <time.h> 97 #include <unistd.h> 98 #include <limits.h> 99 #include <vis.h> 100 101 #include "xmalloc.h" 102 #include "atomicio.h" 103 #include "pathnames.h" 104 #include "log.h" 105 #include "misc.h" 106 #include "progressmeter.h" 107 108 #define COPY_BUFLEN 16384 109 110 int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout); 111 int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout); 112 113 static char dot[] = "."; 114 static char empty[] = ""; 115 116 /* Struct for addargs */ 117 arglist args; 118 arglist remote_remote_args; 119 120 /* Bandwidth limit */ 121 long long limit_kbps = 0; 122 struct bwlimit bwlimit; 123 124 /* Name of current file being transferred. */ 125 char *curfile; 126 127 /* This is set to non-zero to enable verbose mode. */ 128 int verbose_mode = 0; 129 130 /* This is set to zero if the progressmeter is not desired. */ 131 int showprogress = 1; 132 133 /* 134 * This is set to non-zero if remote-remote copy should be piped 135 * through this process. 136 */ 137 int throughlocal = 0; 138 139 /* This is the program to execute for the secured connection. ("ssh" or -S) */ 140 #ifdef RESCUEDIR 141 const char *ssh_program = RESCUEDIR "/ssh"; 142 #else 143 const char *ssh_program = _PATH_SSH_PROGRAM; 144 #endif 145 146 /* This is used to store the pid of ssh_program */ 147 pid_t do_cmd_pid = -1; 148 149 __dead static void 150 killchild(int signo) 151 { 152 if (do_cmd_pid > 1) { 153 kill(do_cmd_pid, signo ? signo : SIGTERM); 154 waitpid(do_cmd_pid, NULL, 0); 155 } 156 157 if (signo) 158 _exit(1); 159 exit(1); 160 } 161 162 static void 163 suspchild(int signo) 164 { 165 int status; 166 167 if (do_cmd_pid > 1) { 168 kill(do_cmd_pid, signo); 169 while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 && 170 errno == EINTR) 171 ; 172 kill(getpid(), SIGSTOP); 173 } 174 } 175 176 static int 177 do_local_cmd(arglist *a) 178 { 179 u_int i; 180 int status; 181 pid_t pid; 182 183 if (a->num == 0) 184 fatal("do_local_cmd: no arguments"); 185 186 if (verbose_mode) { 187 fprintf(stderr, "Executing:"); 188 for (i = 0; i < a->num; i++) 189 fprintf(stderr, " %s", a->list[i]); 190 fprintf(stderr, "\n"); 191 } 192 if ((pid = fork()) == -1) 193 fatal("do_local_cmd: fork: %s", strerror(errno)); 194 195 if (pid == 0) { 196 execvp(a->list[0], a->list); 197 perror(a->list[0]); 198 exit(1); 199 } 200 201 do_cmd_pid = pid; 202 signal(SIGTERM, killchild); 203 signal(SIGINT, killchild); 204 signal(SIGHUP, killchild); 205 206 while (waitpid(pid, &status, 0) == -1) 207 if (errno != EINTR) 208 fatal("do_local_cmd: waitpid: %s", strerror(errno)); 209 210 do_cmd_pid = -1; 211 212 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 213 return (-1); 214 215 return (0); 216 } 217 218 /* 219 * This function executes the given command as the specified user on the 220 * given host. This returns < 0 if execution fails, and >= 0 otherwise. This 221 * assigns the input and output file descriptors on success. 222 */ 223 224 int 225 do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout) 226 { 227 int pin[2], pout[2], reserved[2]; 228 229 if (verbose_mode) 230 fprintf(stderr, 231 "Executing: program %s host %s, user %s, command %s\n", 232 ssh_program, host, 233 remuser ? remuser : "(unspecified)", cmd); 234 235 /* 236 * Reserve two descriptors so that the real pipes won't get 237 * descriptors 0 and 1 because that will screw up dup2 below. 238 */ 239 if (pipe(reserved) < 0) 240 fatal("pipe: %s", strerror(errno)); 241 242 /* Create a socket pair for communicating with ssh. */ 243 if (pipe(pin) < 0) 244 fatal("pipe: %s", strerror(errno)); 245 if (pipe(pout) < 0) 246 fatal("pipe: %s", strerror(errno)); 247 248 /* Free the reserved descriptors. */ 249 close(reserved[0]); 250 close(reserved[1]); 251 252 signal(SIGTSTP, suspchild); 253 signal(SIGTTIN, suspchild); 254 signal(SIGTTOU, suspchild); 255 256 /* Fork a child to execute the command on the remote host using ssh. */ 257 do_cmd_pid = fork(); 258 if (do_cmd_pid == 0) { 259 /* Child. */ 260 close(pin[1]); 261 close(pout[0]); 262 dup2(pin[0], 0); 263 dup2(pout[1], 1); 264 close(pin[0]); 265 close(pout[1]); 266 267 replacearg(&args, 0, "%s", ssh_program); 268 if (remuser != NULL) { 269 addargs(&args, "-l"); 270 addargs(&args, "%s", remuser); 271 } 272 addargs(&args, "--"); 273 addargs(&args, "%s", host); 274 addargs(&args, "%s", cmd); 275 276 execvp(ssh_program, args.list); 277 perror(ssh_program); 278 exit(1); 279 } else if (do_cmd_pid == -1) { 280 fatal("fork: %s", strerror(errno)); 281 } 282 /* Parent. Close the other side, and return the local side. */ 283 close(pin[0]); 284 *fdout = pin[1]; 285 close(pout[1]); 286 *fdin = pout[0]; 287 signal(SIGTERM, killchild); 288 signal(SIGINT, killchild); 289 signal(SIGHUP, killchild); 290 return 0; 291 } 292 293 /* 294 * This functions executes a command simlar to do_cmd(), but expects the 295 * input and output descriptors to be setup by a previous call to do_cmd(). 296 * This way the input and output of two commands can be connected. 297 */ 298 int 299 do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout) 300 { 301 pid_t pid; 302 int status; 303 304 if (verbose_mode) 305 fprintf(stderr, 306 "Executing: 2nd program %s host %s, user %s, command %s\n", 307 ssh_program, host, 308 remuser ? remuser : "(unspecified)", cmd); 309 310 /* Fork a child to execute the command on the remote host using ssh. */ 311 pid = fork(); 312 if (pid == 0) { 313 dup2(fdin, 0); 314 dup2(fdout, 1); 315 316 replacearg(&args, 0, "%s", ssh_program); 317 if (remuser != NULL) { 318 addargs(&args, "-l"); 319 addargs(&args, "%s", remuser); 320 } 321 addargs(&args, "--"); 322 addargs(&args, "%s", host); 323 addargs(&args, "%s", cmd); 324 325 execvp(ssh_program, args.list); 326 perror(ssh_program); 327 exit(1); 328 } else if (pid == -1) { 329 fatal("fork: %s", strerror(errno)); 330 } 331 while (waitpid(pid, &status, 0) == -1) 332 if (errno != EINTR) 333 fatal("do_cmd2: waitpid: %s", strerror(errno)); 334 return 0; 335 } 336 337 typedef struct { 338 size_t cnt; 339 char *buf; 340 } BUF; 341 342 BUF *allocbuf(BUF *, int, int); 343 __dead static void lostconn(int); 344 int okname(char *); 345 void run_err(const char *,...) __printflike(1, 2); 346 void verifydir(char *); 347 348 struct passwd *pwd; 349 uid_t userid; 350 int errs, remin, remout; 351 int pflag, iamremote, iamrecursive, targetshouldbedirectory; 352 353 #define CMDNEEDS 64 354 char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */ 355 356 int response(void); 357 void rsource(char *, struct stat *); 358 void sink(int, char *[]); 359 void source(int, char *[]); 360 static void tolocal(int, char *[]); 361 static void toremote(char *, int, char *[]); 362 __dead static void usage(void); 363 364 int 365 main(int argc, char **argv) 366 { 367 int ch, fflag, tflag, status, n; 368 char *targ, **newargv; 369 const char *errstr; 370 extern char *optarg; 371 extern int optind; 372 373 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 374 sanitise_stdfd(); 375 376 /* Copy argv, because we modify it */ 377 newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv)); 378 for (n = 0; n < argc; n++) 379 newargv[n] = xstrdup(argv[n]); 380 argv = newargv; 381 382 memset(&args, '\0', sizeof(args)); 383 memset(&remote_remote_args, '\0', sizeof(remote_remote_args)); 384 args.list = remote_remote_args.list = NULL; 385 addargs(&args, "%s", ssh_program); 386 addargs(&args, "-x"); 387 addargs(&args, "-oForwardAgent=no"); 388 addargs(&args, "-oPermitLocalCommand=no"); 389 addargs(&args, "-oClearAllForwardings=yes"); 390 391 fflag = tflag = 0; 392 while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1) 393 switch (ch) { 394 /* User-visible flags. */ 395 case '1': 396 case '2': 397 case '4': 398 case '6': 399 case 'C': 400 addargs(&args, "-%c", ch); 401 addargs(&remote_remote_args, "-%c", ch); 402 break; 403 case '3': 404 throughlocal = 1; 405 break; 406 case 'o': 407 case 'c': 408 case 'i': 409 case 'F': 410 addargs(&remote_remote_args, "-%c", ch); 411 addargs(&remote_remote_args, "%s", optarg); 412 addargs(&args, "-%c", ch); 413 addargs(&args, "%s", optarg); 414 break; 415 case 'P': 416 addargs(&remote_remote_args, "-p"); 417 addargs(&remote_remote_args, "%s", optarg); 418 addargs(&args, "-p"); 419 addargs(&args, "%s", optarg); 420 break; 421 case 'B': 422 addargs(&remote_remote_args, "-oBatchmode=yes"); 423 addargs(&args, "-oBatchmode=yes"); 424 break; 425 case 'l': 426 limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024, 427 &errstr); 428 if (errstr != NULL) 429 usage(); 430 limit_kbps *= 1024; /* kbps */ 431 bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN); 432 break; 433 case 'p': 434 pflag = 1; 435 break; 436 case 'r': 437 iamrecursive = 1; 438 break; 439 case 'S': 440 ssh_program = xstrdup(optarg); 441 break; 442 case 'v': 443 addargs(&args, "-v"); 444 addargs(&remote_remote_args, "-v"); 445 verbose_mode = 1; 446 break; 447 case 'q': 448 addargs(&args, "-q"); 449 addargs(&remote_remote_args, "-q"); 450 showprogress = 0; 451 break; 452 453 /* Server options. */ 454 case 'd': 455 targetshouldbedirectory = 1; 456 break; 457 case 'f': /* "from" */ 458 iamremote = 1; 459 fflag = 1; 460 break; 461 case 't': /* "to" */ 462 iamremote = 1; 463 tflag = 1; 464 break; 465 default: 466 usage(); 467 } 468 argc -= optind; 469 argv += optind; 470 471 if ((pwd = getpwuid(userid = getuid())) == NULL) 472 fatal("unknown user %u", (u_int) userid); 473 474 if (!isatty(STDOUT_FILENO)) 475 showprogress = 0; 476 477 if (pflag) { 478 /* Cannot pledge: -p allows setuid/setgid files... */ 479 } else { 480 #ifdef __OpenBSD__ 481 if (pledge("stdio rpath wpath cpath fattr tty proc exec", 482 NULL) == -1) { 483 perror("pledge"); 484 exit(1); 485 } 486 #endif 487 } 488 489 remin = STDIN_FILENO; 490 remout = STDOUT_FILENO; 491 492 if (fflag) { 493 /* Follow "protocol", send data. */ 494 (void) response(); 495 source(argc, argv); 496 exit(errs != 0); 497 } 498 if (tflag) { 499 /* Receive data. */ 500 sink(argc, argv); 501 exit(errs != 0); 502 } 503 if (argc < 2) 504 usage(); 505 if (argc > 2) 506 targetshouldbedirectory = 1; 507 508 remin = remout = -1; 509 do_cmd_pid = -1; 510 /* Command to be executed on remote system using "ssh". */ 511 (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s", 512 verbose_mode ? " -v" : "", 513 iamrecursive ? " -r" : "", pflag ? " -p" : "", 514 targetshouldbedirectory ? " -d" : ""); 515 516 (void) signal(SIGPIPE, lostconn); 517 518 if ((targ = colon(argv[argc - 1]))) /* Dest is remote host. */ 519 toremote(targ, argc, argv); 520 else { 521 if (targetshouldbedirectory) 522 verifydir(argv[argc - 1]); 523 tolocal(argc, argv); /* Dest is local host. */ 524 } 525 /* 526 * Finally check the exit status of the ssh process, if one was forked 527 * and no error has occurred yet 528 */ 529 if (do_cmd_pid != -1 && errs == 0) { 530 if (remin != -1) 531 (void) close(remin); 532 if (remout != -1) 533 (void) close(remout); 534 if (waitpid(do_cmd_pid, &status, 0) == -1) 535 errs = 1; 536 else { 537 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 538 errs = 1; 539 } 540 } 541 exit(errs != 0); 542 } 543 544 /* Callback from atomicio6 to update progress meter and limit bandwidth */ 545 static int 546 scpio(void *_cnt, size_t s) 547 { 548 off_t *cnt = (off_t *)_cnt; 549 550 *cnt += s; 551 if (limit_kbps > 0) 552 bandwidth_limit(&bwlimit, s); 553 return 0; 554 } 555 556 static int 557 do_times(int fd, int verb, const struct stat *sb) 558 { 559 /* strlen(2^64) == 20; strlen(10^6) == 7 */ 560 char buf[(20 + 7 + 2) * 2 + 2]; 561 562 (void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n", 563 (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime), 564 (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime)); 565 if (verb) { 566 fprintf(stderr, "File mtime %lld atime %lld\n", 567 (long long)sb->st_mtime, (long long)sb->st_atime); 568 fprintf(stderr, "Sending file timestamps: %s", buf); 569 } 570 (void) atomicio(vwrite, fd, buf, strlen(buf)); 571 return (response()); 572 } 573 574 void 575 toremote(char *targ, int argc, char **argv) 576 { 577 char *bp, *host, *src, *suser, *thost, *tuser, *arg; 578 arglist alist; 579 int i; 580 u_int j; 581 582 memset(&alist, '\0', sizeof(alist)); 583 alist.list = NULL; 584 585 *targ++ = 0; 586 if (*targ == 0) 587 targ = dot; 588 589 arg = xstrdup(argv[argc - 1]); 590 if ((thost = strrchr(arg, '@'))) { 591 /* user@host */ 592 *thost++ = 0; 593 tuser = arg; 594 if (*tuser == '\0') 595 tuser = NULL; 596 } else { 597 thost = arg; 598 tuser = NULL; 599 } 600 601 if (tuser != NULL && !okname(tuser)) { 602 free(arg); 603 return; 604 } 605 606 for (i = 0; i < argc - 1; i++) { 607 src = colon(argv[i]); 608 if (src && throughlocal) { /* extended remote to remote */ 609 *src++ = 0; 610 if (*src == 0) 611 src = dot; 612 host = strrchr(argv[i], '@'); 613 if (host) { 614 *host++ = 0; 615 host = cleanhostname(host); 616 suser = argv[i]; 617 if (*suser == '\0') 618 suser = pwd->pw_name; 619 else if (!okname(suser)) 620 continue; 621 } else { 622 host = cleanhostname(argv[i]); 623 suser = NULL; 624 } 625 xasprintf(&bp, "%s -f %s%s", cmd, 626 *src == '-' ? "-- " : "", src); 627 if (do_cmd(host, suser, bp, &remin, &remout) < 0) 628 exit(1); 629 free(bp); 630 host = cleanhostname(thost); 631 xasprintf(&bp, "%s -t %s%s", cmd, 632 *targ == '-' ? "-- " : "", targ); 633 if (do_cmd2(host, tuser, bp, remin, remout) < 0) 634 exit(1); 635 free(bp); 636 (void) close(remin); 637 (void) close(remout); 638 remin = remout = -1; 639 } else if (src) { /* standard remote to remote */ 640 freeargs(&alist); 641 addargs(&alist, "%s", ssh_program); 642 addargs(&alist, "-x"); 643 addargs(&alist, "-oClearAllForwardings=yes"); 644 addargs(&alist, "-n"); 645 for (j = 0; j < remote_remote_args.num; j++) { 646 addargs(&alist, "%s", 647 remote_remote_args.list[j]); 648 } 649 *src++ = 0; 650 if (*src == 0) 651 src = dot; 652 host = strrchr(argv[i], '@'); 653 654 if (host) { 655 *host++ = 0; 656 host = cleanhostname(host); 657 suser = argv[i]; 658 if (*suser == '\0') 659 suser = pwd->pw_name; 660 else if (!okname(suser)) 661 continue; 662 addargs(&alist, "-l"); 663 addargs(&alist, "%s", suser); 664 } else { 665 host = cleanhostname(argv[i]); 666 } 667 addargs(&alist, "--"); 668 addargs(&alist, "%s", host); 669 addargs(&alist, "%s", cmd); 670 addargs(&alist, "%s", src); 671 addargs(&alist, "%s%s%s:%s", 672 tuser ? tuser : "", tuser ? "@" : "", 673 thost, targ); 674 if (do_local_cmd(&alist) != 0) 675 errs = 1; 676 } else { /* local to remote */ 677 if (remin == -1) { 678 xasprintf(&bp, "%s -t %s%s", cmd, 679 *targ == '-' ? "-- " : "", targ); 680 host = cleanhostname(thost); 681 if (do_cmd(host, tuser, bp, &remin, 682 &remout) < 0) 683 exit(1); 684 if (response() < 0) 685 exit(1); 686 free(bp); 687 } 688 source(1, argv + i); 689 } 690 } 691 free(arg); 692 } 693 694 static void 695 tolocal(int argc, char **argv) 696 { 697 char *bp, *host, *src, *suser; 698 arglist alist; 699 int i; 700 701 memset(&alist, '\0', sizeof(alist)); 702 alist.list = NULL; 703 704 for (i = 0; i < argc - 1; i++) { 705 if (!(src = colon(argv[i]))) { /* Local to local. */ 706 freeargs(&alist); 707 addargs(&alist, "%s", _PATH_CP); 708 if (iamrecursive) 709 addargs(&alist, "-r"); 710 if (pflag) 711 addargs(&alist, "-p"); 712 addargs(&alist, "--"); 713 addargs(&alist, "%s", argv[i]); 714 addargs(&alist, "%s", argv[argc-1]); 715 if (do_local_cmd(&alist)) 716 ++errs; 717 continue; 718 } 719 *src++ = 0; 720 if (*src == 0) 721 src = dot; 722 if ((host = strrchr(argv[i], '@')) == NULL) { 723 host = argv[i]; 724 suser = NULL; 725 } else { 726 *host++ = 0; 727 suser = argv[i]; 728 if (*suser == '\0') 729 suser = pwd->pw_name; 730 } 731 host = cleanhostname(host); 732 xasprintf(&bp, "%s -f %s%s", 733 cmd, *src == '-' ? "-- " : "", src); 734 if (do_cmd(host, suser, bp, &remin, &remout) < 0) { 735 free(bp); 736 ++errs; 737 continue; 738 } 739 free(bp); 740 sink(1, argv + argc - 1); 741 (void) close(remin); 742 remin = remout = -1; 743 } 744 } 745 746 void 747 source(int argc, char **argv) 748 { 749 struct stat stb; 750 static BUF buffer; 751 BUF *bp; 752 off_t i, statbytes; 753 size_t amt, nr; 754 int fd = -1, haderr, indx; 755 char *last, *name, buf[16384], encname[PATH_MAX]; 756 int len; 757 758 for (indx = 0; indx < argc; ++indx) { 759 fd = -1; 760 name = argv[indx]; 761 statbytes = 0; 762 len = strlen(name); 763 while (len > 1 && name[len-1] == '/') 764 name[--len] = '\0'; 765 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0) 766 goto syserr; 767 if (strchr(name, '\n') != NULL) { 768 strvisx(encname, name, len, VIS_NL); 769 name = encname; 770 } 771 if (fstat(fd, &stb) < 0) { 772 syserr: run_err("%s: %s", name, strerror(errno)); 773 goto next; 774 } 775 if (stb.st_size < 0) { 776 run_err("%s: %s", name, "Negative file size"); 777 goto next; 778 } 779 unset_nonblock(fd); 780 switch (stb.st_mode & S_IFMT) { 781 case S_IFREG: 782 break; 783 case S_IFDIR: 784 if (iamrecursive) { 785 rsource(name, &stb); 786 goto next; 787 } 788 /* FALLTHROUGH */ 789 default: 790 run_err("%s: not a regular file", name); 791 goto next; 792 } 793 if ((last = strrchr(name, '/')) == NULL) 794 last = name; 795 else 796 ++last; 797 curfile = last; 798 if (pflag) { 799 if (do_times(remout, verbose_mode, &stb) < 0) 800 goto next; 801 } 802 #define FILEMODEMASK (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO) 803 snprintf(buf, sizeof buf, "C%04o %lld %s\n", 804 (u_int) (stb.st_mode & FILEMODEMASK), 805 (long long)stb.st_size, last); 806 if (verbose_mode) { 807 fprintf(stderr, "Sending file modes: %s", buf); 808 } 809 (void) atomicio(vwrite, remout, buf, strlen(buf)); 810 if (response() < 0) 811 goto next; 812 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) { 813 next: if (fd != -1) { 814 (void) close(fd); 815 fd = -1; 816 } 817 continue; 818 } 819 if (showprogress) 820 start_progress_meter(curfile, stb.st_size, &statbytes); 821 set_nonblock(remout); 822 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) { 823 amt = bp->cnt; 824 if (i + (off_t)amt > stb.st_size) 825 amt = stb.st_size - i; 826 if (!haderr) { 827 if ((nr = atomicio(read, fd, 828 bp->buf, amt)) != amt) { 829 haderr = errno; 830 memset(bp->buf + nr, 0, amt - nr); 831 } 832 } 833 /* Keep writing after error to retain sync */ 834 if (haderr) { 835 (void)atomicio(vwrite, remout, bp->buf, amt); 836 memset(bp->buf, 0, amt); 837 continue; 838 } 839 if (atomicio6(vwrite, remout, bp->buf, amt, scpio, 840 &statbytes) != amt) 841 haderr = errno; 842 } 843 unset_nonblock(remout); 844 if (showprogress) 845 stop_progress_meter(); 846 847 if (fd != -1) { 848 if (close(fd) < 0 && !haderr) 849 haderr = errno; 850 fd = -1; 851 } 852 if (!haderr) 853 (void) atomicio(vwrite, remout, empty, 1); 854 else 855 run_err("%s: %s", name, strerror(haderr)); 856 (void) response(); 857 } 858 } 859 860 void 861 rsource(char *name, struct stat *statp) 862 { 863 DIR *dirp; 864 struct dirent *dp; 865 char *last, *vect[1], path[PATH_MAX]; 866 867 if (!(dirp = opendir(name))) { 868 run_err("%s: %s", name, strerror(errno)); 869 return; 870 } 871 last = strrchr(name, '/'); 872 if (last == NULL) 873 last = name; 874 else 875 last++; 876 if (pflag) { 877 if (do_times(remout, verbose_mode, statp) < 0) { 878 closedir(dirp); 879 return; 880 } 881 } 882 (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n", 883 (u_int) (statp->st_mode & FILEMODEMASK), 0, last); 884 if (verbose_mode) 885 fprintf(stderr, "Entering directory: %s", path); 886 (void) atomicio(vwrite, remout, path, strlen(path)); 887 if (response() < 0) { 888 closedir(dirp); 889 return; 890 } 891 while ((dp = readdir(dirp)) != NULL) { 892 if (dp->d_ino == 0) 893 continue; 894 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) 895 continue; 896 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) { 897 run_err("%s/%s: name too long", name, dp->d_name); 898 continue; 899 } 900 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name); 901 vect[0] = path; 902 source(1, vect); 903 } 904 (void) closedir(dirp); 905 (void) atomicio(vwrite, remout, __UNCONST("E\n"), 2); 906 (void) response(); 907 } 908 909 void 910 sink(int argc, char **argv) 911 { 912 static BUF buffer; 913 struct stat stb; 914 enum { 915 YES, NO, DISPLAYED 916 } wrerr; 917 BUF *bp; 918 off_t i; 919 size_t j, count; 920 int amt, exists, first, ofd; 921 mode_t mode, omode, mask; 922 off_t size, statbytes; 923 unsigned long long ull; 924 int setimes, targisdir, wrerrno = 0; 925 char ch, *cp, *np, *targ, *vect[1], buf[16384]; 926 const char *why; 927 struct timeval tv[2]; 928 929 #define atime tv[0] 930 #define mtime tv[1] 931 #define SCREWUP(str) { why = str; goto screwup; } 932 933 setimes = targisdir = 0; 934 mask = umask(0); 935 if (!pflag) 936 (void) umask(mask); 937 if (argc != 1) { 938 run_err("ambiguous target"); 939 exit(1); 940 } 941 targ = *argv; 942 if (targetshouldbedirectory) 943 verifydir(targ); 944 945 (void) atomicio(vwrite, remout, empty, 1); 946 if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode)) 947 targisdir = 1; 948 for (first = 1;; first = 0) { 949 cp = buf; 950 if (atomicio(read, remin, cp, 1) != 1) 951 return; 952 if (*cp++ == '\n') 953 SCREWUP("unexpected <newline>"); 954 do { 955 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) 956 SCREWUP("lost connection"); 957 *cp++ = ch; 958 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n'); 959 *cp = 0; 960 if (verbose_mode) 961 fprintf(stderr, "Sink: %s", buf); 962 963 if (buf[0] == '\01' || buf[0] == '\02') { 964 if (iamremote == 0) 965 (void) atomicio(vwrite, STDERR_FILENO, 966 buf + 1, strlen(buf + 1)); 967 if (buf[0] == '\02') 968 exit(1); 969 ++errs; 970 continue; 971 } 972 if (buf[0] == 'E') { 973 (void) atomicio(vwrite, remout, empty, 1); 974 return; 975 } 976 if (ch == '\n') 977 *--cp = 0; 978 979 cp = buf; 980 if (*cp == 'T') { 981 setimes++; 982 cp++; 983 if (!isdigit((unsigned char)*cp)) 984 SCREWUP("mtime.sec not present"); 985 ull = strtoull(cp, &cp, 10); 986 if (!cp || *cp++ != ' ') 987 SCREWUP("mtime.sec not delimited"); 988 if ((time_t)ull < 0 || 989 (unsigned long long)(time_t)ull != ull) 990 setimes = 0; /* out of range */ 991 mtime.tv_sec = ull; 992 mtime.tv_usec = strtol(cp, &cp, 10); 993 if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 || 994 mtime.tv_usec > 999999) 995 SCREWUP("mtime.usec not delimited"); 996 if (!isdigit((unsigned char)*cp)) 997 SCREWUP("atime.sec not present"); 998 ull = strtoull(cp, &cp, 10); 999 if (!cp || *cp++ != ' ') 1000 SCREWUP("atime.sec not delimited"); 1001 if ((time_t)ull < 0 || 1002 (unsigned long long)(time_t)ull != ull) 1003 setimes = 0; /* out of range */ 1004 atime.tv_sec = ull; 1005 atime.tv_usec = strtol(cp, &cp, 10); 1006 if (!cp || *cp++ != '\0' || atime.tv_usec < 0 || 1007 atime.tv_usec > 999999) 1008 SCREWUP("atime.usec not delimited"); 1009 (void) atomicio(vwrite, remout, empty, 1); 1010 continue; 1011 } 1012 if (*cp != 'C' && *cp != 'D') { 1013 /* 1014 * Check for the case "rcp remote:foo\* local:bar". 1015 * In this case, the line "No match." can be returned 1016 * by the shell before the rcp command on the remote is 1017 * executed so the ^Aerror_message convention isn't 1018 * followed. 1019 */ 1020 if (first) { 1021 run_err("%s", cp); 1022 exit(1); 1023 } 1024 SCREWUP("expected control record"); 1025 } 1026 mode = 0; 1027 for (++cp; cp < buf + 5; cp++) { 1028 if (*cp < '0' || *cp > '7') 1029 SCREWUP("bad mode"); 1030 mode = (mode << 3) | (*cp - '0'); 1031 } 1032 if (*cp++ != ' ') 1033 SCREWUP("mode not delimited"); 1034 1035 for (size = 0; isdigit((unsigned char)*cp);) 1036 size = size * 10 + (*cp++ - '0'); 1037 if (*cp++ != ' ') 1038 SCREWUP("size not delimited"); 1039 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) { 1040 run_err("error: unexpected filename: %s", cp); 1041 exit(1); 1042 } 1043 if (targisdir) { 1044 static char *namebuf; 1045 static size_t cursize; 1046 size_t need; 1047 1048 need = strlen(targ) + strlen(cp) + 250; 1049 if (need > cursize) { 1050 free(namebuf); 1051 namebuf = xmalloc(need); 1052 cursize = need; 1053 } 1054 (void) snprintf(namebuf, need, "%s%s%s", targ, 1055 strcmp(targ, "/") ? "/" : "", cp); 1056 np = namebuf; 1057 } else 1058 np = targ; 1059 curfile = cp; 1060 exists = stat(np, &stb) == 0; 1061 if (buf[0] == 'D') { 1062 int mod_flag = pflag; 1063 if (!iamrecursive) 1064 SCREWUP("received directory without -r"); 1065 if (exists) { 1066 if (!S_ISDIR(stb.st_mode)) { 1067 errno = ENOTDIR; 1068 goto bad; 1069 } 1070 if (pflag) 1071 (void) chmod(np, mode); 1072 } else { 1073 /* Handle copying from a read-only 1074 directory */ 1075 mod_flag = 1; 1076 if (mkdir(np, mode | S_IRWXU) < 0) 1077 goto bad; 1078 } 1079 vect[0] = xstrdup(np); 1080 sink(1, vect); 1081 if (setimes) { 1082 setimes = 0; 1083 if (utimes(vect[0], tv) < 0) 1084 run_err("%s: set times: %s", 1085 vect[0], strerror(errno)); 1086 } 1087 if (mod_flag) 1088 (void) chmod(vect[0], mode); 1089 free(vect[0]); 1090 continue; 1091 } 1092 omode = mode; 1093 mode |= S_IWUSR; 1094 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) { 1095 bad: run_err("%s: %s", np, strerror(errno)); 1096 continue; 1097 } 1098 (void) atomicio(vwrite, remout, empty, 1); 1099 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) { 1100 (void) close(ofd); 1101 continue; 1102 } 1103 cp = bp->buf; 1104 wrerr = NO; 1105 1106 statbytes = 0; 1107 if (showprogress) 1108 start_progress_meter(curfile, size, &statbytes); 1109 set_nonblock(remin); 1110 for (count = i = 0; i < size; i += bp->cnt) { 1111 amt = bp->cnt; 1112 if (i + amt > size) 1113 amt = size - i; 1114 count += amt; 1115 do { 1116 j = atomicio6(read, remin, cp, amt, 1117 scpio, &statbytes); 1118 if (j == 0) { 1119 run_err("%s", j != EPIPE ? 1120 strerror(errno) : 1121 "dropped connection"); 1122 exit(1); 1123 } 1124 amt -= j; 1125 cp += j; 1126 } while (amt > 0); 1127 1128 if (count == bp->cnt) { 1129 /* Keep reading so we stay sync'd up. */ 1130 if (wrerr == NO) { 1131 if (atomicio(vwrite, ofd, bp->buf, 1132 count) != count) { 1133 wrerr = YES; 1134 wrerrno = errno; 1135 } 1136 } 1137 count = 0; 1138 cp = bp->buf; 1139 } 1140 } 1141 unset_nonblock(remin); 1142 if (showprogress) 1143 stop_progress_meter(); 1144 if (count != 0 && wrerr == NO && 1145 atomicio(vwrite, ofd, bp->buf, count) != count) { 1146 wrerr = YES; 1147 wrerrno = errno; 1148 } 1149 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) && 1150 ftruncate(ofd, size) != 0) { 1151 run_err("%s: truncate: %s", np, strerror(errno)); 1152 wrerr = DISPLAYED; 1153 } 1154 if (pflag) { 1155 if (exists || omode != mode) 1156 if (fchmod(ofd, omode)) { 1157 run_err("%s: set mode: %s", 1158 np, strerror(errno)); 1159 wrerr = DISPLAYED; 1160 } 1161 } else { 1162 if (!exists && omode != mode) 1163 if (fchmod(ofd, omode & ~mask)) { 1164 run_err("%s: set mode: %s", 1165 np, strerror(errno)); 1166 wrerr = DISPLAYED; 1167 } 1168 } 1169 if (close(ofd) == -1) { 1170 wrerr = YES; 1171 wrerrno = errno; 1172 } 1173 (void) response(); 1174 if (setimes && wrerr == NO) { 1175 setimes = 0; 1176 if (utimes(np, tv) < 0) { 1177 run_err("%s: set times: %s", 1178 np, strerror(errno)); 1179 wrerr = DISPLAYED; 1180 } 1181 } 1182 switch (wrerr) { 1183 case YES: 1184 run_err("%s: %s", np, strerror(wrerrno)); 1185 break; 1186 case NO: 1187 (void) atomicio(vwrite, remout, empty, 1); 1188 break; 1189 case DISPLAYED: 1190 break; 1191 } 1192 } 1193 screwup: 1194 run_err("protocol error: %s", why); 1195 exit(1); 1196 } 1197 1198 int 1199 response(void) 1200 { 1201 char ch, *cp, resp, rbuf[2048]; 1202 1203 if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp)) 1204 lostconn(0); 1205 1206 cp = rbuf; 1207 switch (resp) { 1208 case 0: /* ok */ 1209 return (0); 1210 default: 1211 *cp++ = resp; 1212 /* FALLTHROUGH */ 1213 case 1: /* error, followed by error msg */ 1214 case 2: /* fatal error, "" */ 1215 do { 1216 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) 1217 lostconn(0); 1218 *cp++ = ch; 1219 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n'); 1220 1221 if (!iamremote) 1222 (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf); 1223 ++errs; 1224 if (resp == 1) 1225 return (-1); 1226 exit(1); 1227 } 1228 /* NOTREACHED */ 1229 } 1230 1231 void 1232 usage(void) 1233 { 1234 (void) fprintf(stderr, 1235 "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n" 1236 " [-l limit] [-o ssh_option] [-P port] [-S program]\n" 1237 " [[user@]host1:]file1 ... [[user@]host2:]file2\n"); 1238 exit(1); 1239 } 1240 1241 void 1242 run_err(const char *fmt,...) 1243 { 1244 static FILE *fp; 1245 va_list ap; 1246 1247 ++errs; 1248 if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) { 1249 (void) fprintf(fp, "%c", 0x01); 1250 (void) fprintf(fp, "scp: "); 1251 va_start(ap, fmt); 1252 (void) vfprintf(fp, fmt, ap); 1253 va_end(ap); 1254 (void) fprintf(fp, "\n"); 1255 (void) fflush(fp); 1256 } 1257 1258 if (!iamremote) { 1259 va_start(ap, fmt); 1260 vfprintf(stderr, fmt, ap); 1261 va_end(ap); 1262 fprintf(stderr, "\n"); 1263 } 1264 } 1265 1266 void 1267 verifydir(char *cp) 1268 { 1269 struct stat stb; 1270 1271 if (!stat(cp, &stb)) { 1272 if (S_ISDIR(stb.st_mode)) 1273 return; 1274 errno = ENOTDIR; 1275 } 1276 run_err("%s: %s", cp, strerror(errno)); 1277 killchild(0); 1278 } 1279 1280 int 1281 okname(char *cp0) 1282 { 1283 int c; 1284 char *cp; 1285 1286 cp = cp0; 1287 do { 1288 c = (int)*cp; 1289 if (c & 0200) 1290 goto bad; 1291 if (!isalpha(c) && !isdigit((unsigned char)c)) { 1292 switch (c) { 1293 case '\'': 1294 case '"': 1295 case '`': 1296 case ' ': 1297 case '#': 1298 goto bad; 1299 default: 1300 break; 1301 } 1302 } 1303 } while (*++cp); 1304 return (1); 1305 1306 bad: fprintf(stderr, "%s: invalid user name\n", cp0); 1307 return (0); 1308 } 1309 1310 BUF * 1311 allocbuf(BUF *bp, int fd, int blksize) 1312 { 1313 size_t size; 1314 struct stat stb; 1315 1316 if (fstat(fd, &stb) < 0) { 1317 run_err("fstat: %s", strerror(errno)); 1318 return (0); 1319 } 1320 size = roundup(stb.st_blksize, blksize); 1321 if (size == 0) 1322 size = blksize; 1323 if (bp->cnt >= size) 1324 return (bp); 1325 if (bp->buf == NULL) 1326 bp->buf = xmalloc(size); 1327 else 1328 bp->buf = xreallocarray(bp->buf, 1, size); 1329 memset(bp->buf, 0, size); 1330 bp->cnt = size; 1331 return (bp); 1332 } 1333 1334 static void 1335 lostconn(int signo) 1336 { 1337 if (!iamremote) 1338 (void)write(STDERR_FILENO, "lost connection\n", 16); 1339 if (signo) 1340 _exit(1); 1341 else 1342 exit(1); 1343 } 1344