1/* $OpenBSD: scp.c,v 1.171 2011/09/09 22:37:01 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 "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 __APPLE_XSAN__ 82#include <sys/mount.h> 83#endif 84#ifdef HAVE_POLL_H 85#include <poll.h> 86#else 87# ifdef HAVE_SYS_POLL_H 88# include <sys/poll.h> 89# endif 90#endif 91#ifdef HAVE_SYS_TIME_H 92# include <sys/time.h> 93#endif 94#include <sys/wait.h> 95#include <sys/uio.h> 96 97#include <ctype.h> 98#include <dirent.h> 99#include <errno.h> 100#include <fcntl.h> 101#include <pwd.h> 102#include <signal.h> 103#include <stdarg.h> 104#include <stdio.h> 105#include <stdlib.h> 106#include <string.h> 107#include <time.h> 108#include <unistd.h> 109#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS) 110#include <vis.h> 111#endif 112 113#include "xmalloc.h" 114#include "atomicio.h" 115#include "pathnames.h" 116#include "log.h" 117#include "misc.h" 118#include "progressmeter.h" 119 120#ifdef HAVE_COPYFILE_H 121#include <libgen.h> 122#include <copyfile.h> 123#endif 124 125extern char *__progname; 126 127#define COPY_BUFLEN 16384 128 129int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout); 130int do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout); 131 132/* Struct for addargs */ 133arglist args; 134arglist remote_remote_args; 135 136/* Bandwidth limit */ 137long long limit_kbps = 0; 138struct bwlimit bwlimit; 139 140/* Name of current file being transferred. */ 141char *curfile; 142 143/* This is set to non-zero to enable verbose mode. */ 144int verbose_mode = 0; 145 146/* This is set to zero if the progressmeter is not desired. */ 147int showprogress = 1; 148 149/* 150 * This is set to non-zero if remote-remote copy should be piped 151 * through this process. 152 */ 153int throughlocal = 0; 154 155/* This is the program to execute for the secured connection. ("ssh" or -S) */ 156char *ssh_program = _PATH_SSH_PROGRAM; 157 158/* This is used to store the pid of ssh_program */ 159pid_t do_cmd_pid = -1; 160 161#ifdef HAVE_COPYFILE 162int copy_xattr = 0; 163int md_flag = 0; 164#endif 165 166 167static void 168killchild(int signo) 169{ 170 if (do_cmd_pid > 1) { 171 kill(do_cmd_pid, signo ? signo : SIGTERM); 172 waitpid(do_cmd_pid, NULL, 0); 173 } 174 175 if (signo) 176 _exit(1); 177 exit(1); 178} 179 180static void 181suspchild(int signo) 182{ 183 int status; 184 185 if (do_cmd_pid > 1) { 186 kill(do_cmd_pid, signo); 187 while (waitpid(do_cmd_pid, &status, WUNTRACED) == -1 && 188 errno == EINTR) 189 ; 190 kill(getpid(), SIGSTOP); 191 } 192} 193 194static int 195do_local_cmd(arglist *a) 196{ 197 u_int i; 198 int status; 199 pid_t pid; 200 201 if (a->num == 0) 202 fatal("do_local_cmd: no arguments"); 203 204 if (verbose_mode) { 205 fprintf(stderr, "Executing:"); 206 for (i = 0; i < a->num; i++) 207 fprintf(stderr, " %s", a->list[i]); 208 fprintf(stderr, "\n"); 209 } 210 if ((pid = fork()) == -1) 211 fatal("do_local_cmd: fork: %s", strerror(errno)); 212 213 if (pid == 0) { 214 execvp(a->list[0], a->list); 215 perror(a->list[0]); 216 exit(1); 217 } 218 219 do_cmd_pid = pid; 220 signal(SIGTERM, killchild); 221 signal(SIGINT, killchild); 222 signal(SIGHUP, killchild); 223 224 while (waitpid(pid, &status, 0) == -1) 225 if (errno != EINTR) 226 fatal("do_local_cmd: waitpid: %s", strerror(errno)); 227 228 do_cmd_pid = -1; 229 230 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 231 return (-1); 232 233 return (0); 234} 235 236/* 237 * This function executes the given command as the specified user on the 238 * given host. This returns < 0 if execution fails, and >= 0 otherwise. This 239 * assigns the input and output file descriptors on success. 240 */ 241 242int 243do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout) 244{ 245 int pin[2], pout[2], reserved[2]; 246 247 if (verbose_mode) 248 fprintf(stderr, 249 "Executing: program %s host %s, user %s, command %s\n", 250 ssh_program, host, 251 remuser ? remuser : "(unspecified)", cmd); 252 253 /* 254 * Reserve two descriptors so that the real pipes won't get 255 * descriptors 0 and 1 because that will screw up dup2 below. 256 */ 257 if (pipe(reserved) < 0) 258 fatal("pipe: %s", strerror(errno)); 259 260 /* Create a socket pair for communicating with ssh. */ 261 if (pipe(pin) < 0) 262 fatal("pipe: %s", strerror(errno)); 263 if (pipe(pout) < 0) 264 fatal("pipe: %s", strerror(errno)); 265 266 /* Free the reserved descriptors. */ 267 close(reserved[0]); 268 close(reserved[1]); 269 270 signal(SIGTSTP, suspchild); 271 signal(SIGTTIN, suspchild); 272 signal(SIGTTOU, suspchild); 273 274 /* Fork a child to execute the command on the remote host using ssh. */ 275 do_cmd_pid = fork(); 276 if (do_cmd_pid == 0) { 277 /* Child. */ 278 close(pin[1]); 279 close(pout[0]); 280 dup2(pin[0], 0); 281 dup2(pout[1], 1); 282 close(pin[0]); 283 close(pout[1]); 284 285 replacearg(&args, 0, "%s", ssh_program); 286 if (remuser != NULL) { 287 addargs(&args, "-l"); 288 addargs(&args, "%s", remuser); 289 } 290 addargs(&args, "--"); 291 addargs(&args, "%s", host); 292 addargs(&args, "%s", cmd); 293 294 execvp(ssh_program, args.list); 295 perror(ssh_program); 296 exit(1); 297 } else if (do_cmd_pid == -1) { 298 fatal("fork: %s", strerror(errno)); 299 } 300 /* Parent. Close the other side, and return the local side. */ 301 close(pin[0]); 302 *fdout = pin[1]; 303 close(pout[1]); 304 *fdin = pout[0]; 305 signal(SIGTERM, killchild); 306 signal(SIGINT, killchild); 307 signal(SIGHUP, killchild); 308 return 0; 309} 310 311/* 312 * This functions executes a command simlar to do_cmd(), but expects the 313 * input and output descriptors to be setup by a previous call to do_cmd(). 314 * This way the input and output of two commands can be connected. 315 */ 316int 317do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout) 318{ 319 pid_t pid; 320 int status; 321 322 if (verbose_mode) 323 fprintf(stderr, 324 "Executing: 2nd program %s host %s, user %s, command %s\n", 325 ssh_program, host, 326 remuser ? remuser : "(unspecified)", cmd); 327 328 /* Fork a child to execute the command on the remote host using ssh. */ 329 pid = fork(); 330 if (pid == 0) { 331 dup2(fdin, 0); 332 dup2(fdout, 1); 333 334 replacearg(&args, 0, "%s", ssh_program); 335 if (remuser != NULL) { 336 addargs(&args, "-l"); 337 addargs(&args, "%s", remuser); 338 } 339 addargs(&args, "--"); 340 addargs(&args, "%s", host); 341 addargs(&args, "%s", cmd); 342 343 execvp(ssh_program, args.list); 344 perror(ssh_program); 345 exit(1); 346 } else if (pid == -1) { 347 fatal("fork: %s", strerror(errno)); 348 } 349 while (waitpid(pid, &status, 0) == -1) 350 if (errno != EINTR) 351 fatal("do_cmd2: waitpid: %s", strerror(errno)); 352 return 0; 353} 354 355typedef struct { 356 size_t cnt; 357 char *buf; 358} BUF; 359 360BUF *allocbuf(BUF *, int, int); 361void lostconn(int); 362int okname(char *); 363void run_err(const char *,...); 364void verifydir(char *); 365 366struct passwd *pwd; 367uid_t userid; 368int errs, remin, remout; 369int pflag, iamremote, iamrecursive, targetshouldbedirectory; 370 371#define CMDNEEDS 64 372char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */ 373 374int response(void); 375void rsource(char *, struct stat *); 376void sink(int, char *[]); 377void source(int, char *[]); 378void tolocal(int, char *[]); 379void toremote(char *, int, char *[]); 380void usage(void); 381 382int 383main(int argc, char **argv) 384{ 385 int ch, fflag, tflag, status, n; 386 char *targ, **newargv; 387 const char *errstr; 388 extern char *optarg; 389 extern int optind; 390 391 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 392 sanitise_stdfd(); 393 394 /* Copy argv, because we modify it */ 395 newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv)); 396 for (n = 0; n < argc; n++) 397 newargv[n] = xstrdup(argv[n]); 398 argv = newargv; 399 400 __progname = ssh_get_progname(argv[0]); 401 402 memset(&args, '\0', sizeof(args)); 403 memset(&remote_remote_args, '\0', sizeof(remote_remote_args)); 404 args.list = remote_remote_args.list = NULL; 405 addargs(&args, "%s", ssh_program); 406 addargs(&args, "-x"); 407 addargs(&args, "-oForwardAgent=no"); 408 addargs(&args, "-oPermitLocalCommand=no"); 409 addargs(&args, "-oClearAllForwardings=yes"); 410 411 fflag = tflag = 0; 412#if HAVE_COPYFILE 413 while ((ch = getopt(argc, argv, "dfl:prtvBCEc:i:P:q12346S:o:F:")) != -1) 414#else 415 while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1) 416#endif 417 switch (ch) { 418 /* User-visible flags. */ 419 case '1': 420 case '2': 421 case '4': 422 case '6': 423 case 'C': 424 addargs(&args, "-%c", ch); 425 addargs(&remote_remote_args, "-%c", ch); 426 break; 427 case '3': 428 throughlocal = 1; 429 break; 430 case 'o': 431 case 'c': 432 case 'i': 433 case 'F': 434 addargs(&remote_remote_args, "-%c", ch); 435 addargs(&remote_remote_args, "%s", optarg); 436 addargs(&args, "-%c", ch); 437 addargs(&args, "%s", optarg); 438 break; 439 case 'P': 440 addargs(&remote_remote_args, "-p"); 441 addargs(&remote_remote_args, "%s", optarg); 442 addargs(&args, "-p"); 443 addargs(&args, "%s", optarg); 444 break; 445 case 'B': 446 addargs(&remote_remote_args, "-oBatchmode=yes"); 447 addargs(&args, "-oBatchmode=yes"); 448 break; 449 case 'l': 450 limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024, 451 &errstr); 452 if (errstr != NULL) 453 usage(); 454 limit_kbps *= 1024; /* kbps */ 455 bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN); 456 break; 457 case 'p': 458 pflag = 1; 459 break; 460 case 'r': 461 iamrecursive = 1; 462 break; 463 case 'S': 464 ssh_program = xstrdup(optarg); 465 break; 466 case 'v': 467 addargs(&args, "-v"); 468 addargs(&remote_remote_args, "-v"); 469 verbose_mode = 1; 470 break; 471 case 'q': 472 addargs(&args, "-q"); 473 addargs(&remote_remote_args, "-q"); 474 showprogress = 0; 475 break; 476 477#ifdef HAVE_COPYFILE 478 case 'E': 479 copy_xattr = 1; 480 break; 481#endif 482 /* Server options. */ 483 case 'd': 484 targetshouldbedirectory = 1; 485 break; 486 case 'f': /* "from" */ 487 iamremote = 1; 488 fflag = 1; 489 break; 490 case 't': /* "to" */ 491 iamremote = 1; 492 tflag = 1; 493#ifdef HAVE_CYGWIN 494 setmode(0, O_BINARY); 495#endif 496 break; 497 default: 498 usage(); 499 } 500 argc -= optind; 501 argv += optind; 502 503 if ((pwd = getpwuid(userid = getuid())) == NULL) 504 fatal("unknown user %u", (u_int) userid); 505 506 if (!isatty(STDOUT_FILENO)) 507 showprogress = 0; 508 509 remin = STDIN_FILENO; 510 remout = STDOUT_FILENO; 511 512 if (fflag) { 513 /* Follow "protocol", send data. */ 514 (void) response(); 515 source(argc, argv); 516 exit(errs != 0); 517 } 518 if (tflag) { 519 /* Receive data. */ 520 sink(argc, argv); 521 exit(errs != 0); 522 } 523 if (argc < 2) 524 usage(); 525 if (argc > 2) 526 targetshouldbedirectory = 1; 527 528 remin = remout = -1; 529 do_cmd_pid = -1; 530 /* Command to be executed on remote system using "ssh". */ 531#if HAVE_COPYFILE 532 (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s%s", 533 copy_xattr ? " -E" : "", 534#else 535 (void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s", 536#endif 537 verbose_mode ? " -v" : "", 538 iamrecursive ? " -r" : "", pflag ? " -p" : "", 539 targetshouldbedirectory ? " -d" : ""); 540 541 (void) signal(SIGPIPE, lostconn); 542 543 if ((targ = colon(argv[argc - 1]))) /* Dest is remote host. */ 544 toremote(targ, argc, argv); 545 else { 546 if (targetshouldbedirectory) 547 verifydir(argv[argc - 1]); 548 tolocal(argc, argv); /* Dest is local host. */ 549 } 550 /* 551 * Finally check the exit status of the ssh process, if one was forked 552 * and no error has occurred yet 553 */ 554 if (do_cmd_pid != -1 && errs == 0) { 555 if (remin != -1) 556 (void) close(remin); 557 if (remout != -1) 558 (void) close(remout); 559 if (waitpid(do_cmd_pid, &status, 0) == -1) 560 errs = 1; 561 else { 562 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 563 errs = 1; 564 } 565 } 566 exit(errs != 0); 567} 568 569/* Callback from atomicio6 to update progress meter and limit bandwidth */ 570static int 571scpio(void *_cnt, size_t s) 572{ 573 off_t *cnt = (off_t *)_cnt; 574 575 *cnt += s; 576 if (limit_kbps > 0) 577 bandwidth_limit(&bwlimit, s); 578 return 0; 579} 580 581void 582toremote(char *targ, int argc, char **argv) 583{ 584 char *bp, *host, *src, *suser, *thost, *tuser, *arg; 585 arglist alist; 586 int i; 587 u_int j; 588 589 memset(&alist, '\0', sizeof(alist)); 590 alist.list = NULL; 591 592 *targ++ = 0; 593 if (*targ == 0) 594 targ = "."; 595 596 arg = xstrdup(argv[argc - 1]); 597 if ((thost = strrchr(arg, '@'))) { 598 /* user@host */ 599 *thost++ = 0; 600 tuser = arg; 601 if (*tuser == '\0') 602 tuser = NULL; 603 } else { 604 thost = arg; 605 tuser = NULL; 606 } 607 608 if (tuser != NULL && !okname(tuser)) { 609 xfree(arg); 610 return; 611 } 612 613 for (i = 0; i < argc - 1; i++) { 614 src = colon(argv[i]); 615 if (src && throughlocal) { /* extended remote to remote */ 616 *src++ = 0; 617 if (*src == 0) 618 src = "."; 619 host = strrchr(argv[i], '@'); 620 if (host) { 621 *host++ = 0; 622 host = cleanhostname(host); 623 suser = argv[i]; 624 if (*suser == '\0') 625 suser = pwd->pw_name; 626 else if (!okname(suser)) 627 continue; 628 } else { 629 host = cleanhostname(argv[i]); 630 suser = NULL; 631 } 632 xasprintf(&bp, "%s -f %s%s", cmd, 633 *src == '-' ? "-- " : "", src); 634 if (do_cmd(host, suser, bp, &remin, &remout) < 0) 635 exit(1); 636 (void) xfree(bp); 637 host = cleanhostname(thost); 638 xasprintf(&bp, "%s -t %s%s", cmd, 639 *targ == '-' ? "-- " : "", targ); 640 if (do_cmd2(host, tuser, bp, remin, remout) < 0) 641 exit(1); 642 (void) xfree(bp); 643 (void) close(remin); 644 (void) close(remout); 645 remin = remout = -1; 646 } else if (src) { /* standard remote to remote */ 647 freeargs(&alist); 648 addargs(&alist, "%s", ssh_program); 649 addargs(&alist, "-x"); 650 addargs(&alist, "-oClearAllForwardings=yes"); 651 addargs(&alist, "-n"); 652 for (j = 0; j < remote_remote_args.num; j++) { 653 addargs(&alist, "%s", 654 remote_remote_args.list[j]); 655 } 656 *src++ = 0; 657 if (*src == 0) 658 src = "."; 659 host = strrchr(argv[i], '@'); 660 661 if (host) { 662 *host++ = 0; 663 host = cleanhostname(host); 664 suser = argv[i]; 665 if (*suser == '\0') 666 suser = pwd->pw_name; 667 else if (!okname(suser)) 668 continue; 669 addargs(&alist, "-l"); 670 addargs(&alist, "%s", suser); 671 } else { 672 host = cleanhostname(argv[i]); 673 } 674 addargs(&alist, "--"); 675 addargs(&alist, "%s", host); 676 addargs(&alist, "%s", cmd); 677 addargs(&alist, "%s", src); 678 addargs(&alist, "%s%s%s:%s", 679 tuser ? tuser : "", tuser ? "@" : "", 680 thost, targ); 681 if (do_local_cmd(&alist) != 0) 682 errs = 1; 683 } else { /* local to remote */ 684 if (remin == -1) { 685 xasprintf(&bp, "%s -t %s%s", cmd, 686 *targ == '-' ? "-- " : "", targ); 687 host = cleanhostname(thost); 688 if (do_cmd(host, tuser, bp, &remin, 689 &remout) < 0) 690 exit(1); 691 if (response() < 0) 692 exit(1); 693 (void) xfree(bp); 694 } 695 source(1, argv + i); 696 } 697 } 698 xfree(arg); 699} 700 701void 702tolocal(int argc, char **argv) 703{ 704 char *bp, *host, *src, *suser; 705 arglist alist; 706 int i; 707 708 memset(&alist, '\0', sizeof(alist)); 709 alist.list = NULL; 710 711 for (i = 0; i < argc - 1; i++) { 712 if (!(src = colon(argv[i]))) { /* Local to local. */ 713 freeargs(&alist); 714 addargs(&alist, "%s", _PATH_CP); 715 if (iamrecursive) 716 addargs(&alist, "-r"); 717 if (pflag) 718 addargs(&alist, "-p"); 719 addargs(&alist, "--"); 720 addargs(&alist, "%s", argv[i]); 721 addargs(&alist, "%s", argv[argc-1]); 722 if (do_local_cmd(&alist)) 723 ++errs; 724 continue; 725 } 726 *src++ = 0; 727 if (*src == 0) 728 src = "."; 729 if ((host = strrchr(argv[i], '@')) == NULL) { 730 host = argv[i]; 731 suser = NULL; 732 } else { 733 *host++ = 0; 734 suser = argv[i]; 735 if (*suser == '\0') 736 suser = pwd->pw_name; 737 } 738 host = cleanhostname(host); 739 xasprintf(&bp, "%s -f %s%s", 740 cmd, *src == '-' ? "-- " : "", src); 741 if (do_cmd(host, suser, bp, &remin, &remout) < 0) { 742 (void) xfree(bp); 743 ++errs; 744 continue; 745 } 746 xfree(bp); 747 sink(1, argv + argc - 1); 748 (void) close(remin); 749 remin = remout = -1; 750 } 751} 752 753void 754source(int argc, char **argv) 755{ 756 struct stat stb; 757 static BUF buffer; 758 BUF *bp; 759 off_t i, statbytes; 760 size_t amt; 761 int fd = -1, haderr, indx; 762 char *last, *name, buf[2048], encname[MAXPATHLEN]; 763 int len; 764#if HAVE_COPYFILE 765 char md_name[MAXPATHLEN]; 766 char *md_tmp; 767#endif 768 769 for (indx = 0; indx < argc; ++indx) { 770 name = argv[indx]; 771 statbytes = 0; 772 len = strlen(name); 773 while (len > 1 && name[len-1] == '/') 774 name[--len] = '\0'; 775#if HAVE_COPYFILE 776md_next: 777 statbytes = 0; 778 if (md_flag) { 779 fd = open(md_tmp, O_RDONLY, 0); 780 unlink(md_tmp); 781 free(md_tmp); 782 if (fd < 0) 783 goto syserr; 784 } else { 785#endif 786 if ((fd = open(name, O_RDONLY|O_NONBLOCK, 0)) < 0) 787 goto syserr; 788 if (strchr(name, '\n') != NULL) { 789 strnvis(encname, name, sizeof(encname), VIS_NL); 790 name = encname; 791 } 792#if HAVE_COPYFILE 793 } 794#endif 795 if (fstat(fd, &stb) < 0) { 796syserr: run_err("%s: %s", name, strerror(errno)); 797 goto next; 798 } 799 if (stb.st_size < 0) { 800 run_err("%s: %s", name, "Negative file size"); 801 goto next; 802 } 803 unset_nonblock(fd); 804 switch (stb.st_mode & S_IFMT) { 805 case S_IFREG: 806 break; 807 case S_IFDIR: 808 if (iamrecursive) { 809 rsource(name, &stb); 810 goto next; 811 } 812 /* FALLTHROUGH */ 813 default: 814 run_err("%s: not a regular file", name); 815 goto next; 816 } 817 if ((last = strrchr(name, '/')) == NULL) 818 last = name; 819 else 820 ++last; 821 curfile = last; 822 if (pflag) { 823 /* 824 * Make it compatible with possible future 825 * versions expecting microseconds. 826 */ 827 (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n", 828 (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime), 829 (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime)); 830 if (verbose_mode) { 831 fprintf(stderr, "File mtime %ld atime %ld\n", 832 (long)stb.st_mtime, (long)stb.st_atime); 833 fprintf(stderr, "Sending file timestamps: %s", 834 buf); 835 } 836 (void) atomicio(vwrite, remout, buf, strlen(buf)); 837 if (response() < 0) 838 goto next; 839 } 840#define FILEMODEMASK (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO) 841 snprintf(buf, sizeof buf, "C%04o %lld %s\n", 842 (u_int) (stb.st_mode & FILEMODEMASK), 843 (long long)stb.st_size, last); 844 if (verbose_mode) { 845 fprintf(stderr, "Sending file modes: %s", buf); 846 } 847 (void) atomicio(vwrite, remout, buf, strlen(buf)); 848 if (response() < 0) 849 goto next; 850 if ((bp = allocbuf(&buffer, fd, COPY_BUFLEN)) == NULL) { 851next: if (fd != -1) { 852 (void) close(fd); 853 fd = -1; 854 } 855 continue; 856 } 857 if (showprogress) 858 start_progress_meter(curfile, stb.st_size, &statbytes); 859 set_nonblock(remout); 860 for (haderr = i = 0; i < stb.st_size; i += bp->cnt) { 861 amt = bp->cnt; 862 if (i + (off_t)amt > stb.st_size) 863 amt = stb.st_size - i; 864 if (!haderr) { 865 if (atomicio(read, fd, bp->buf, amt) != amt) 866 haderr = errno; 867 } 868 /* Keep writing after error to retain sync */ 869 if (haderr) { 870 (void)atomicio(vwrite, remout, bp->buf, amt); 871 continue; 872 } 873 if (atomicio6(vwrite, remout, bp->buf, amt, scpio, 874 &statbytes) != amt) 875 haderr = errno; 876 } 877 unset_nonblock(remout); 878 if (showprogress) 879 stop_progress_meter(); 880 881 if (fd != -1) { 882 if (close(fd) < 0 && !haderr) 883 haderr = errno; 884 fd = -1; 885 } 886 if (!haderr) 887 (void) atomicio(vwrite, remout, "", 1); 888 else 889 run_err("%s: %s", name, strerror(haderr)); 890 (void) response(); 891#ifdef HAVE_COPYFILE 892 if (copy_xattr && md_flag == 0) 893 { 894 if (!copyfile(name, NULL, 0, 895 COPYFILE_ACL | COPYFILE_XATTR | COPYFILE_CHECK)) 896 continue; 897 898 /* 899 * this file will hold the actual metadata 900 * to be transferred 901 */ 902 md_tmp = strdup("/tmp/scp.md.XXXXXX"); 903 md_tmp = mktemp(md_tmp); 904 905 if(copyfile(name, md_tmp, 0, 906 COPYFILE_ACL | COPYFILE_XATTR | COPYFILE_PACK) == 0) 907 { 908 /* 909 * this is the fake name to display 910 */ 911 snprintf(md_name, sizeof md_name, "%s/._%s", dirname(name), basename(name)); 912 name = md_name; 913 md_flag = 1; 914 if (verbose_mode) 915 fprintf(stderr, "copyfile(%s, %s, PACK)\n", name, md_tmp); 916 goto md_next; 917 } 918 } else 919 md_flag = 0; 920#endif 921 } 922} 923 924void 925rsource(char *name, struct stat *statp) 926{ 927 DIR *dirp; 928 struct dirent *dp; 929 char *last, *vect[1], path[1100]; 930 931 if (!(dirp = opendir(name))) { 932 run_err("%s: %s", name, strerror(errno)); 933 return; 934 } 935 last = strrchr(name, '/'); 936 if (last == 0) 937 last = name; 938 else 939 last++; 940 if (pflag) { 941 (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n", 942 (u_long) statp->st_mtime, 943 (u_long) statp->st_atime); 944 (void) atomicio(vwrite, remout, path, strlen(path)); 945 if (response() < 0) { 946 closedir(dirp); 947 return; 948 } 949 } 950 (void) snprintf(path, sizeof path, "D%04o %d %.1024s\n", 951 (u_int) (statp->st_mode & FILEMODEMASK), 0, last); 952 if (verbose_mode) 953 fprintf(stderr, "Entering directory: %s", path); 954 (void) atomicio(vwrite, remout, path, strlen(path)); 955 if (response() < 0) { 956 closedir(dirp); 957 return; 958 } 959 while ((dp = readdir(dirp)) != NULL) { 960 if (dp->d_ino == 0) 961 continue; 962 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) 963 continue; 964 if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path) - 1) { 965 run_err("%s/%s: name too long", name, dp->d_name); 966 continue; 967 } 968 (void) snprintf(path, sizeof path, "%s/%s", name, dp->d_name); 969 vect[0] = path; 970 source(1, vect); 971 } 972 (void) closedir(dirp); 973 (void) atomicio(vwrite, remout, "E\n", 2); 974 (void) response(); 975} 976 977void 978sink(int argc, char **argv) 979{ 980 static BUF buffer; 981 struct stat stb; 982 enum { 983 YES, NO, DISPLAYED 984 } wrerr; 985 BUF *bp; 986 off_t i; 987 size_t j, count; 988 int amt, exists, first, ofd; 989 mode_t mode, omode, mask; 990 off_t size, statbytes; 991 int setimes, targisdir, wrerrno = 0; 992 char ch, *cp, *np, *targ, *why, *vect[1], buf[2048]; 993 struct timeval tv[2]; 994 995#define atime tv[0] 996#define mtime tv[1] 997#define SCREWUP(str) { why = str; goto screwup; } 998 999 setimes = targisdir = 0; 1000 mask = umask(0); 1001 if (!pflag) 1002 (void) umask(mask); 1003 if (argc != 1) { 1004 run_err("ambiguous target"); 1005 exit(1); 1006 } 1007 targ = *argv; 1008 if (targetshouldbedirectory) 1009 verifydir(targ); 1010 1011 (void) atomicio(vwrite, remout, "", 1); 1012 if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode)) 1013 targisdir = 1; 1014 for (first = 1;; first = 0) { 1015#if HAVE_COPYFILE 1016 char md_src[MAXPATHLEN]; 1017 char md_dst[MAXPATHLEN]; 1018#endif 1019 cp = buf; 1020 if (atomicio(read, remin, cp, 1) != 1) 1021 return; 1022 if (*cp++ == '\n') 1023 SCREWUP("unexpected <newline>"); 1024 do { 1025 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) 1026 SCREWUP("lost connection"); 1027 *cp++ = ch; 1028 } while (cp < &buf[sizeof(buf) - 1] && ch != '\n'); 1029 *cp = 0; 1030 if (verbose_mode) 1031 fprintf(stderr, "Sink: %s", buf); 1032 1033 if (buf[0] == '\01' || buf[0] == '\02') { 1034 if (iamremote == 0) 1035 (void) atomicio(vwrite, STDERR_FILENO, 1036 buf + 1, strlen(buf + 1)); 1037 if (buf[0] == '\02') 1038 exit(1); 1039 ++errs; 1040 continue; 1041 } 1042 if (buf[0] == 'E') { 1043 (void) atomicio(vwrite, remout, "", 1); 1044 return; 1045 } 1046 if (ch == '\n') 1047 *--cp = 0; 1048 1049 cp = buf; 1050 if (*cp == 'T') { 1051 setimes++; 1052 cp++; 1053 mtime.tv_sec = strtol(cp, &cp, 10); 1054 if (!cp || *cp++ != ' ') 1055 SCREWUP("mtime.sec not delimited"); 1056 mtime.tv_usec = strtol(cp, &cp, 10); 1057 if (!cp || *cp++ != ' ') 1058 SCREWUP("mtime.usec not delimited"); 1059 atime.tv_sec = strtol(cp, &cp, 10); 1060 if (!cp || *cp++ != ' ') 1061 SCREWUP("atime.sec not delimited"); 1062 atime.tv_usec = strtol(cp, &cp, 10); 1063 if (!cp || *cp++ != '\0') 1064 SCREWUP("atime.usec not delimited"); 1065 (void) atomicio(vwrite, remout, "", 1); 1066 continue; 1067 } 1068 if (*cp != 'C' && *cp != 'D') { 1069 /* 1070 * Check for the case "rcp remote:foo\* local:bar". 1071 * In this case, the line "No match." can be returned 1072 * by the shell before the rcp command on the remote is 1073 * executed so the ^Aerror_message convention isn't 1074 * followed. 1075 */ 1076 if (first) { 1077 run_err("%s", cp); 1078 exit(1); 1079 } 1080 SCREWUP("expected control record"); 1081 } 1082 mode = 0; 1083 for (++cp; cp < buf + 5; cp++) { 1084 if (*cp < '0' || *cp > '7') 1085 SCREWUP("bad mode"); 1086 mode = (mode << 3) | (*cp - '0'); 1087 } 1088 if (*cp++ != ' ') 1089 SCREWUP("mode not delimited"); 1090 1091 for (size = 0; isdigit(*cp);) 1092 size = size * 10 + (*cp++ - '0'); 1093 if (*cp++ != ' ') 1094 SCREWUP("size not delimited"); 1095 if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) { 1096 run_err("error: unexpected filename: %s", cp); 1097 exit(1); 1098 } 1099 if (targisdir) { 1100 static char *namebuf; 1101 static size_t cursize; 1102 size_t need; 1103 1104 need = strlen(targ) + strlen(cp) + 250; 1105 if (need > cursize) { 1106 if (namebuf) 1107 xfree(namebuf); 1108 namebuf = xmalloc(need); 1109 cursize = need; 1110 } 1111 (void) snprintf(namebuf, need, "%s%s%s", targ, 1112 strcmp(targ, "/") ? "/" : "", cp); 1113 np = namebuf; 1114 } else 1115 np = targ; 1116 curfile = cp; 1117 exists = stat(np, &stb) == 0; 1118 if (buf[0] == 'D') { 1119 int mod_flag = pflag; 1120 if (!iamrecursive) 1121 SCREWUP("received directory without -r"); 1122 if (exists) { 1123 if (!S_ISDIR(stb.st_mode)) { 1124 errno = ENOTDIR; 1125 goto bad; 1126 } 1127 if (pflag) 1128 (void) chmod(np, mode); 1129 } else { 1130 /* Handle copying from a read-only 1131 directory */ 1132 mod_flag = 1; 1133 if (mkdir(np, mode | S_IRWXU) < 0) 1134 goto bad; 1135 } 1136 vect[0] = xstrdup(np); 1137 sink(1, vect); 1138 if (setimes) { 1139 setimes = 0; 1140 if (utimes(vect[0], tv) < 0) 1141 run_err("%s: set times: %s", 1142 vect[0], strerror(errno)); 1143 } 1144 if (mod_flag) 1145 (void) chmod(vect[0], mode); 1146 if (vect[0]) 1147 xfree(vect[0]); 1148 continue; 1149 } 1150 omode = mode; 1151 mode |= S_IWRITE; 1152 1153#if HAVE_COPYFILE 1154 if (copy_xattr && !strncmp(basename(curfile), "._", 2)) 1155 { 1156 int mdfd; 1157 if (targisdir) 1158 { 1159 snprintf(md_src, sizeof md_src, "%s.XXXXXX", np); 1160 snprintf(md_dst, sizeof md_dst, "%s/%s", 1161 dirname(np), basename(np) + 2); 1162 if((mdfd = mkstemp(md_src)) < 0) 1163 continue; 1164 } 1165 else 1166 { 1167 snprintf(md_src, sizeof md_src, "%s/._%s.XXXXXX", 1168 dirname(np), basename(np)); 1169 snprintf(md_dst, sizeof md_dst, "%s", np); 1170 if((mdfd = mkstemp(md_src)) < 0) 1171 continue; 1172 } 1173 if (mdfd >= 0) 1174 close(mdfd); 1175 np = md_src; 1176 } 1177#endif 1178 if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) { 1179bad: run_err("%s: %s", np, strerror(errno)); 1180 continue; 1181 } 1182#ifdef __APPLE_XSAN__ 1183 { 1184 /* 1185 * Pre-allocate blocks for the destination file. 1186 */ 1187 fstore_t fst; 1188 1189 fst.fst_flags = 0; 1190 fst.fst_posmode = F_PEOFPOSMODE; 1191 fst.fst_offset = 0; 1192 fst.fst_length = size; 1193 1194 (void) fcntl(ofd, F_PREALLOCATE, &fst); 1195 } 1196#endif /* __APPLE_XSAN__ */ 1197 (void) atomicio(vwrite, remout, "", 1); 1198 if ((bp = allocbuf(&buffer, ofd, COPY_BUFLEN)) == NULL) { 1199 (void) close(ofd); 1200 continue; 1201 } 1202 cp = bp->buf; 1203 wrerr = NO; 1204 1205 statbytes = 0; 1206 if (showprogress) 1207 start_progress_meter(curfile, size, &statbytes); 1208 set_nonblock(remin); 1209 for (count = i = 0; i < size; i += bp->cnt) { 1210 amt = bp->cnt; 1211 if (i + amt > size) 1212 amt = size - i; 1213 count += amt; 1214 do { 1215 j = atomicio6(read, remin, cp, amt, 1216 scpio, &statbytes); 1217 if (j == 0) { 1218 run_err("%s", j != EPIPE ? 1219 strerror(errno) : 1220 "dropped connection"); 1221 exit(1); 1222 } 1223 amt -= j; 1224 cp += j; 1225 } while (amt > 0); 1226 1227 if (count == bp->cnt) { 1228 /* Keep reading so we stay sync'd up. */ 1229 if (wrerr == NO) { 1230 if (atomicio(vwrite, ofd, bp->buf, 1231 count) != count) { 1232 wrerr = YES; 1233 wrerrno = errno; 1234 } 1235 } 1236 count = 0; 1237 cp = bp->buf; 1238 } 1239 } 1240 unset_nonblock(remin); 1241 if (showprogress) 1242 stop_progress_meter(); 1243 if (count != 0 && wrerr == NO && 1244 atomicio(vwrite, ofd, bp->buf, count) != count) { 1245 wrerr = YES; 1246 wrerrno = errno; 1247 } 1248 if (wrerr == NO && (!exists || S_ISREG(stb.st_mode)) && 1249 ftruncate(ofd, size) != 0) { 1250 run_err("%s: truncate: %s", np, strerror(errno)); 1251 wrerr = DISPLAYED; 1252 } 1253 if (pflag) { 1254 if (exists || omode != mode) 1255#ifdef HAVE_FCHMOD 1256 if (fchmod(ofd, omode)) { 1257#else /* HAVE_FCHMOD */ 1258 if (chmod(np, omode)) { 1259#endif /* HAVE_FCHMOD */ 1260 run_err("%s: set mode: %s", 1261 np, strerror(errno)); 1262 wrerr = DISPLAYED; 1263 } 1264 } else { 1265 if (!exists && omode != mode) 1266#ifdef HAVE_FCHMOD 1267 if (fchmod(ofd, omode & ~mask)) { 1268#else /* HAVE_FCHMOD */ 1269 if (chmod(np, omode & ~mask)) { 1270#endif /* HAVE_FCHMOD */ 1271 run_err("%s: set mode: %s", 1272 np, strerror(errno)); 1273 wrerr = DISPLAYED; 1274 } 1275 } 1276 if (close(ofd) == -1) { 1277 wrerr = YES; 1278 wrerrno = errno; 1279 } 1280 (void) response(); 1281#ifdef HAVE_COPYFILE 1282 if (copy_xattr && strncmp(basename(np), "._", 2) == 0) 1283 { 1284 if (verbose_mode) 1285 fprintf(stderr, "copyfile(%s, %s, UNPACK)\n", md_src, md_dst); 1286 if(!copyfile(md_src, md_dst, 0, 1287 COPYFILE_ACL | COPYFILE_XATTR | COPYFILE_UNPACK) < 0) 1288 { 1289 snprintf(md_dst, sizeof md_dst, "%s/._%s", 1290 dirname(md_dst), basename(md_dst)); 1291 rename(md_src, md_dst); 1292 } else 1293 unlink(md_src); 1294 if (setimes && wrerr == NO) { 1295 setimes = 0; 1296 if (utimes(md_dst, tv) < 0) { 1297 run_err("%s: set times: %s", 1298 np, strerror(errno)); 1299 wrerr = DISPLAYED; 1300 } 1301 } 1302 } else 1303#endif 1304 if (setimes && wrerr == NO) { 1305 setimes = 0; 1306 if (utimes(np, tv) < 0) { 1307 run_err("%s: set times: %s", 1308 np, strerror(errno)); 1309 wrerr = DISPLAYED; 1310 } 1311 } 1312 switch (wrerr) { 1313 case YES: 1314 run_err("%s: %s", np, strerror(wrerrno)); 1315 break; 1316 case NO: 1317 (void) atomicio(vwrite, remout, "", 1); 1318 break; 1319 case DISPLAYED: 1320 break; 1321 } 1322 } 1323screwup: 1324 run_err("protocol error: %s", why); 1325 exit(1); 1326} 1327 1328int 1329response(void) 1330{ 1331 char ch, *cp, resp, rbuf[2048]; 1332 1333 if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp)) 1334 lostconn(0); 1335 1336 cp = rbuf; 1337 switch (resp) { 1338 case 0: /* ok */ 1339 return (0); 1340 default: 1341 *cp++ = resp; 1342 /* FALLTHROUGH */ 1343 case 1: /* error, followed by error msg */ 1344 case 2: /* fatal error, "" */ 1345 do { 1346 if (atomicio(read, remin, &ch, sizeof(ch)) != sizeof(ch)) 1347 lostconn(0); 1348 *cp++ = ch; 1349 } while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n'); 1350 1351 if (!iamremote) 1352 (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf); 1353 ++errs; 1354 if (resp == 1) 1355 return (-1); 1356 exit(1); 1357 } 1358 /* NOTREACHED */ 1359} 1360 1361void 1362usage(void) 1363{ 1364 (void) fprintf(stderr, 1365#if HAVE_COPYFILE 1366 "usage: scp [-12346BCEpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n" 1367#else 1368 "usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n" 1369#endif 1370 " [-l limit] [-o ssh_option] [-P port] [-S program]\n" 1371 " [[user@]host1:]file1 ... [[user@]host2:]file2\n"); 1372 exit(1); 1373} 1374 1375void 1376run_err(const char *fmt,...) 1377{ 1378 static FILE *fp; 1379 va_list ap; 1380 1381 ++errs; 1382 if (fp != NULL || (remout != -1 && (fp = fdopen(remout, "w")))) { 1383 (void) fprintf(fp, "%c", 0x01); 1384 (void) fprintf(fp, "scp: "); 1385 va_start(ap, fmt); 1386 (void) vfprintf(fp, fmt, ap); 1387 va_end(ap); 1388 (void) fprintf(fp, "\n"); 1389 (void) fflush(fp); 1390 } 1391 1392 if (!iamremote) { 1393 va_start(ap, fmt); 1394 vfprintf(stderr, fmt, ap); 1395 va_end(ap); 1396 fprintf(stderr, "\n"); 1397 } 1398} 1399 1400void 1401verifydir(char *cp) 1402{ 1403 struct stat stb; 1404 1405 if (!stat(cp, &stb)) { 1406 if (S_ISDIR(stb.st_mode)) 1407 return; 1408 errno = ENOTDIR; 1409 } 1410 run_err("%s: %s", cp, strerror(errno)); 1411 killchild(0); 1412} 1413 1414int 1415okname(char *cp0) 1416{ 1417 int c; 1418 char *cp; 1419 1420 cp = cp0; 1421 do { 1422 c = (int)*cp; 1423 if (c & 0200) 1424 goto bad; 1425 if (!isalpha(c) && !isdigit(c)) { 1426 switch (c) { 1427 case '\'': 1428 case '"': 1429 case '`': 1430 case ' ': 1431 case '#': 1432 goto bad; 1433 default: 1434 break; 1435 } 1436 } 1437 } while (*++cp); 1438 return (1); 1439 1440bad: fprintf(stderr, "%s: invalid user name\n", cp0); 1441 return (0); 1442} 1443 1444BUF * 1445allocbuf(BUF *bp, int fd, int blksize) 1446{ 1447 size_t size; 1448#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE 1449 struct stat stb; 1450 1451 if (fstat(fd, &stb) < 0) { 1452 run_err("fstat: %s", strerror(errno)); 1453 return (0); 1454 } 1455 size = roundup(stb.st_blksize, blksize); 1456 if (size == 0) 1457 size = blksize; 1458#else /* HAVE_STRUCT_STAT_ST_BLKSIZE */ 1459 size = blksize; 1460#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */ 1461 if (bp->cnt >= size) 1462 return (bp); 1463 if (bp->buf == NULL) 1464 bp->buf = xmalloc(size); 1465 else 1466 bp->buf = xrealloc(bp->buf, 1, size); 1467 memset(bp->buf, 0, size); 1468 bp->cnt = size; 1469 return (bp); 1470} 1471 1472void 1473lostconn(int signo) 1474{ 1475 if (!iamremote) 1476 write(STDERR_FILENO, "lost connection\n", 16); 1477 if (signo) 1478 _exit(1); 1479 else 1480 exit(1); 1481} 1482