/*- * Copyright (c) 1991, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)utils.c 8.3 (Berkeley) 4/1/94 * $FreeBSD: src/bin/cp/utils.c,v 1.27.2.6 2002/08/10 13:20:19 johan Exp $ * $DragonFly: src/bin/cp/utils.c,v 1.3 2004/03/19 17:30:59 cpressey Exp $ */ #include #include #include #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED #include #endif #include #include #include #include #include #include #include #include #include #include "extern.h" int copy_file(FTSENT *entp, int dne) { static char buf[MAXBSIZE]; struct stat *fs; int ch, checkch, from_fd, rcount, rval, to_fd, wcount, wresid; char *bufp; #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED char *p; #endif if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { warn("%s", entp->fts_path); return (1); } fs = entp->fts_statp; /* * If the file exists and we're interactive, verify with the user. * If the file DNE, set the mode to be the from file, minus setuid * bits, modified by the umask; arguably wrong, but it makes copying * executables work right and it's been that way forever. (The * other choice is 666 or'ed with the execute bits on the from file * modified by the umask.) */ if (!dne) { #define YESNO "(y/n [n]) " if (nflag) { if (vflag) printf("%s not overwritten\n", to.p_path); return (0); } else if (iflag) { (void)fprintf(stderr, "overwrite %s? %s", to.p_path, YESNO); checkch = ch = getchar(); while (ch != '\n' && ch != EOF) ch = getchar(); if (checkch != 'y' && checkch != 'Y') { (void)close(from_fd); (void)fprintf(stderr, "not overwritten\n"); return (1); } } if (fflag) { /* remove existing destination file name, * create a new file */ (void)unlink(to.p_path); to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, fs->st_mode & ~(S_ISUID | S_ISGID)); } else /* overwrite existing destination file name */ to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); } else to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, fs->st_mode & ~(S_ISUID | S_ISGID)); if (to_fd == -1) { warn("%s", to.p_path); (void)close(from_fd); return (1);; } rval = 0; /* * Mmap and write if less than 8M (the limit is so we don't totally * trash memory on big files. This is really a minor hack, but it * wins some CPU back. */ #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) { if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { warn("%s", entp->fts_path); rval = 1; } else { for (bufp = p, wresid = fs->st_size; ; bufp += wcount, wresid -= wcount) { wcount = write(to_fd, bufp, wresid); if (wcount >= wresid || wcount <= 0) break; } if (wcount != wresid) { warn("%s", to.p_path); rval = 1; } /* Some systems don't unmap on close(2). */ if (munmap(p, fs->st_size) < 0) { warn("%s", entp->fts_path); rval = 1; } } } else #endif { while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { for (bufp = buf, wresid = rcount; ; bufp += wcount, wresid -= wcount) { wcount = write(to_fd, bufp, wresid); if (wcount >= wresid || wcount <= 0) break; } if (wcount != wresid) { warn("%s", to.p_path); rval = 1; break; } } if (rcount < 0) { warn("%s", entp->fts_path); rval = 1; } } /* * Don't remove the target even after an error. The target might * not be a regular file, or its attributes might be important, * or its contents might be irreplaceable. It would only be safe * to remove it if we created it and its length is 0. */ if (pflag && setfile(fs, to_fd)) rval = 1; (void)close(from_fd); if (close(to_fd)) { warn("%s", to.p_path); rval = 1; } return (rval); } int copy_link(FTSENT *p, int exists) { int len; char linkname[PATH_MAX]; if ((len = readlink(p->fts_path, linkname, sizeof(linkname) - 1)) == -1) { warn("readlink: %s", p->fts_path); return (1); } linkname[len] = '\0'; if (exists && unlink(to.p_path)) { warn("unlink: %s", to.p_path); return (1); } if (symlink(linkname, to.p_path)) { warn("symlink: %s", linkname); return (1); } return (0); } int copy_fifo(struct stat *from_stat, int exists) { if (exists && unlink(to.p_path)) { warn("unlink: %s", to.p_path); return (1); } if (mkfifo(to.p_path, from_stat->st_mode)) { warn("mkfifo: %s", to.p_path); return (1); } return (pflag ? setfile(from_stat, 0) : 0); } int copy_special(struct stat *from_stat, int exists) { if (exists && unlink(to.p_path)) { warn("unlink: %s", to.p_path); return (1); } if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { warn("mknod: %s", to.p_path); return (1); } return (pflag ? setfile(from_stat, 0) : 0); } #define RETAINBITS \ (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) int setfile(struct stat *fs, int fd) { static struct timeval tv[2]; struct stat ts; int rval; int gotstat; rval = 0; fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO; TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); if (utimes(to.p_path, tv)) { warn("utimes: %s", to.p_path); rval = 1; } if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts)) gotstat = 0; else { gotstat = 1; ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO; } /* * Changing the ownership probably won't succeed, unless we're root * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting * the mode; current BSD behavior is to remove all setuid bits on * chown. If chown fails, lose setuid/setgid bits. */ if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : chown(to.p_path, fs->st_uid, fs->st_gid)) { if (errno != EPERM) { warn("chown: %s", to.p_path); rval = 1; } fs->st_mode &= ~(S_ISUID | S_ISGID); } if (!gotstat || fs->st_mode != ts.st_mode) if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { warn("chmod: %s", to.p_path); rval = 1; } if (!gotstat || fs->st_flags != ts.st_flags) if (fd ? fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { warn("chflags: %s", to.p_path); rval = 1; } return (rval); } void usage(void) { (void)fprintf(stderr, "%s\n%s\n", "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target", " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory"); exit(EX_USAGE); }