/* $OpenBSD: utils.c,v 1.29 2007/09/22 21:10:49 sobrado Exp $ */ /* $NetBSD: utils.c,v 1.6 1997/02/26 14:40:51 cgd Exp $ */ /*- * 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. 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. */ #ifndef lint #if 0 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; #else static char rcsid[] = "$OpenBSD: utils.c,v 1.29 2007/09/22 21:10:49 sobrado Exp $"; #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include "extern.h" int copy_file(FTSENT *entp, int dne) { static char *buf; static char *zeroes; struct stat to_stat, *fs; int ch, checkch, from_fd, rcount, rval, to_fd, wcount; #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED char *p; #endif if (!buf) { buf = malloc(MAXBSIZE); if (!buf) err(1, "malloc"); } if (!zeroes) { zeroes = malloc(MAXBSIZE); if (!zeroes) err(1, "malloc"); memset(zeroes, 0, MAXBSIZE); } if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { warn("%s", entp->fts_path); return (1); } fs = entp->fts_statp; /* * In -f (force) mode, we always unlink the destination first * if it exists. Note that -i and -f are mutually exclusive. */ if (!dne && fflag) (void)unlink(to.p_path); /* * 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 && !fflag) { if (iflag) { (void)fprintf(stderr, "overwrite %s? ", to.p_path); checkch = ch = getchar(); while (ch != '\n' && ch != EOF) ch = getchar(); if (checkch != 'y' && checkch != 'Y') { (void)close(from_fd); return (0); } } 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_ISTXT | 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 (fs->st_size <= 8 * 1048576) { if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { warn("mmap: %s", entp->fts_path); rval = 1; } else { madvise(p, fs->st_size, MADV_SEQUENTIAL); if (write(to_fd, p, fs->st_size) != fs->st_size) { 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 { int skipholes = 0; struct stat tosb; if (!fstat(to_fd, &tosb) && S_ISREG(tosb.st_mode)) skipholes = 1; while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { if (skipholes && memcmp(buf, zeroes, rcount) == 0) wcount = lseek(to_fd, rcount, SEEK_CUR) == -1 ? -1 : rcount; else wcount = write(to_fd, buf, rcount); if (rcount != wcount || wcount == -1) { warn("%s", to.p_path); rval = 1; break; } } if (skipholes && rcount >= 0) rcount = ftruncate(to_fd, fs->st_size); if (rcount < 0) { warn("%s", entp->fts_path); rval = 1; } } if (rval == 1) { (void)close(from_fd); (void)close(to_fd); return (1); } if (pflag && setfile(fs, to_fd)) rval = 1; /* * If the source was setuid or setgid, lose the bits unless the * copy is owned by the same user and group. */ #define RETAINBITS \ (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { if (fstat(to_fd, &to_stat)) { warn("%s", to.p_path); rval = 1; } else if (fs->st_gid == to_stat.st_gid && fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { warn("%s", to.p_path); 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 link[MAXPATHLEN]; if ((len = readlink(p->fts_path, link, sizeof(link)-1)) == -1) { warn("readlink: %s", p->fts_path); return (1); } link[len] = '\0'; if (exists && unlink(to.p_path)) { warn("unlink: %s", to.p_path); return (1); } if (symlink(link, to.p_path)) { warn("symlink: %s", link); return (1); } return (pflag ? setlink(p->fts_statp) : 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); } int setfile(struct stat *fs, int fd) { static struct timeval tv[2]; int rval; rval = 0; fs->st_mode &= S_ISTXT | S_ISUID | S_ISGID | 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; } /* * 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 (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_ISTXT | S_ISUID | S_ISGID); } if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { warn("chmod: %s", to.p_path); rval = 1; } /* * XXX * NFS doesn't support chflags; ignore errors unless there's reason * to believe we're losing bits. (Note, this still won't be right * if the server supports flags and we were trying to *remove* flags * on a file that we copied, i.e., that we didn't create.) */ errno = 0; if (fd ? fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) if (errno != EOPNOTSUPP || fs->st_flags != 0) { warn("chflags: %s", to.p_path); rval = 1; } return (rval); } int setlink(struct stat *fs) { if (lchown(to.p_path, fs->st_uid, fs->st_gid)) { if (errno != EPERM) { warn("lchown: %s", to.p_path); return (1); } } return (0); } void usage(void) { (void)fprintf(stderr, "usage: %s [-fip] [-R [-H | -L | -P]] source target\n", __progname); (void)fprintf(stderr, " %s [-fip] [-R [-H | -L | -P]] source ... directory\n", __progname); exit(1); }