| /* $NetBSD: utils.c,v 1.41 2012/01/04 15:58:37 christos 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. |
| */ |
| |
| #include <sys/cdefs.h> |
| #ifndef lint |
| #if 0 |
| static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; |
| #else |
| __RCSID("$NetBSD: utils.c,v 1.41 2012/01/04 15:58:37 christos Exp $"); |
| #endif |
| #endif /* not lint */ |
| |
| #include <sys/mman.h> |
| #include <sys/param.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #ifndef ANDROID |
| #include <sys/extattr.h> |
| #endif |
| |
| #include <err.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <fts.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "extern.h" |
| |
| #ifdef ANDROID |
| #define MAXBSIZE 65536 |
| #endif |
| |
| #define MMAP_MAX_SIZE (8 * 1048576) |
| #define MMAP_MAX_WRITE (64 * 1024) |
| |
| int |
| set_utimes(const char *file, struct stat *fs) |
| { |
| static struct timeval tv[2]; |
| |
| #ifdef ANDROID |
| tv[0].tv_sec = fs->st_atime; |
| tv[0].tv_usec = 0; |
| tv[1].tv_sec = fs->st_mtime; |
| tv[1].tv_usec = 0; |
| |
| if (utimes(file, tv)) { |
| warn("utimes: %s", file); |
| return 1; |
| } |
| #else |
| TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); |
| TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); |
| |
| if (lutimes(file, tv)) { |
| warn("lutimes: %s", file); |
| return (1); |
| } |
| #endif |
| return (0); |
| } |
| |
| struct finfo { |
| const char *from; |
| const char *to; |
| size_t size; |
| }; |
| |
| static void |
| progress(const struct finfo *fi, size_t written) |
| { |
| int pcent = (int)((100.0 * written) / fi->size); |
| |
| pinfo = 0; |
| (void)fprintf(stderr, "%s => %s %zu/%zu bytes %d%% written\n", |
| fi->from, fi->to, written, fi->size, pcent); |
| } |
| |
| int |
| copy_file(FTSENT *entp, int dne) |
| { |
| static char buf[MAXBSIZE]; |
| struct stat to_stat, *fs; |
| int ch, checkch, from_fd, rcount, rval, to_fd, tolnk, wcount; |
| char *p; |
| size_t ptotal = 0; |
| |
| if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { |
| warn("%s", entp->fts_path); |
| return (1); |
| } |
| |
| to_fd = -1; |
| fs = entp->fts_statp; |
| tolnk = ((Rflag && !(Lflag || Hflag)) || Pflag); |
| |
| /* |
| * 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) { |
| struct stat sb; |
| int sval; |
| |
| 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); |
| } |
| } |
| |
| sval = tolnk ? |
| lstat(to.p_path, &sb) : stat(to.p_path, &sb); |
| if (sval == -1) { |
| warn("stat: %s", to.p_path); |
| (void)close(from_fd); |
| return (1); |
| } |
| |
| if (!(tolnk && S_ISLNK(sb.st_mode))) |
| 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 && (fflag || tolnk)) { |
| /* |
| * attempt to remove existing destination file name and |
| * 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)); |
| } |
| |
| if (to_fd == -1) { |
| warn("%s", to.p_path); |
| (void)close(from_fd); |
| return (1); |
| } |
| |
| rval = 0; |
| |
| /* if hard linking then simply close the open fds, link and return */ |
| if (lflag) { |
| (void)close(from_fd); |
| (void)close(to_fd); |
| (void)unlink(to.p_path); |
| if (link(entp->fts_path, to.p_path)) { |
| warn("%s", to.p_path); |
| return (1); |
| } |
| return (0); |
| } |
| /* NOTREACHED */ |
| |
| /* |
| * There's no reason to do anything other than close the file |
| * now if it's empty, so let's not bother. |
| */ |
| if (fs->st_size > 0) { |
| struct finfo fi; |
| |
| fi.from = entp->fts_path; |
| fi.to = to.p_path; |
| fi.size = (size_t)fs->st_size; |
| |
| /* |
| * 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. |
| */ |
| bool use_read; |
| |
| use_read = true; |
| if (fs->st_size <= MMAP_MAX_SIZE) { |
| size_t fsize = (size_t)fs->st_size; |
| p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, |
| from_fd, (off_t)0); |
| if (p != MAP_FAILED) { |
| size_t remainder; |
| |
| use_read = false; |
| |
| (void) madvise(p, (size_t)fs->st_size, |
| MADV_SEQUENTIAL); |
| |
| /* |
| * Write out the data in small chunks to |
| * avoid locking the output file for a |
| * long time if the reading the data from |
| * the source is slow. |
| */ |
| remainder = fsize; |
| do { |
| ssize_t chunk; |
| |
| chunk = (remainder > MMAP_MAX_WRITE) ? |
| MMAP_MAX_WRITE : remainder; |
| if (write(to_fd, &p[fsize - remainder], |
| chunk) != chunk) { |
| warn("%s", to.p_path); |
| rval = 1; |
| break; |
| } |
| remainder -= chunk; |
| ptotal += chunk; |
| if (pinfo) |
| progress(&fi, ptotal); |
| } while (remainder > 0); |
| |
| if (munmap(p, fsize) < 0) { |
| warn("%s", entp->fts_path); |
| rval = 1; |
| } |
| } |
| } |
| |
| if (use_read) { |
| while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { |
| wcount = write(to_fd, buf, (size_t)rcount); |
| if (rcount != wcount || wcount == -1) { |
| warn("%s", to.p_path); |
| rval = 1; |
| break; |
| } |
| ptotal += wcount; |
| if (pinfo) |
| progress(&fi, ptotal); |
| } |
| if (rcount < 0) { |
| warn("%s", entp->fts_path); |
| rval = 1; |
| } |
| } |
| } |
| |
| #ifndef ANDROID |
| if (pflag && (fcpxattr(from_fd, to_fd) != 0)) |
| warn("%s: error copying extended attributes", to.p_path); |
| #endif |
| |
| (void)close(from_fd); |
| |
| if (rval == 1) { |
| (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) |
| if (!pflag && dne |
| && 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; |
| } |
| } |
| if (close(to_fd)) { |
| warn("%s", to.p_path); |
| rval = 1; |
| } |
| /* set the mod/access times now after close of the fd */ |
| if (pflag && set_utimes(to.p_path, fs)) { |
| rval = 1; |
| } |
| return (rval); |
| } |
| |
| int |
| copy_link(FTSENT *p, int exists) |
| { |
| int len; |
| char target[MAXPATHLEN]; |
| |
| if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { |
| warn("readlink: %s", p->fts_path); |
| return (1); |
| } |
| target[len] = '\0'; |
| if (exists && unlink(to.p_path)) { |
| warn("unlink: %s", to.p_path); |
| return (1); |
| } |
| if (symlink(target, to.p_path)) { |
| warn("symlink: %s", target); |
| return (1); |
| } |
| return (pflag ? setfile(p->fts_statp, 0) : 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); |
| } |
| |
| |
| /* |
| * Function: setfile |
| * |
| * Purpose: |
| * Set the owner/group/permissions for the "to" file to the information |
| * in the stat structure. If fd is zero, also call set_utimes() to set |
| * the mod/access times. If fd is non-zero, the caller must do a utimes |
| * itself after close(fd). |
| */ |
| int |
| setfile(struct stat *fs, int fd) |
| { |
| int rval = 0; |
| #ifndef ANDROID |
| int islink = S_ISLNK(fs->st_mode); |
| #endif |
| |
| fs->st_mode &= S_ISUID | S_ISGID | 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 (fd ? fchown(fd, fs->st_uid, fs->st_gid) : |
| lchown(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); |
| } |
| #ifdef ANDROID |
| if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { |
| #else |
| if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { |
| #endif |
| warn("chmod: %s", to.p_path); |
| rval = 1; |
| } |
| |
| #ifndef ANDROID |
| if (!islink && !Nflag) { |
| unsigned long fflags = fs->st_flags; |
| /* |
| * 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, fflags) : |
| chflags(to.p_path, fflags)) == -1) |
| if (errno != EOPNOTSUPP || fs->st_flags != 0) { |
| warn("chflags: %s", to.p_path); |
| rval = 1; |
| } |
| } |
| #endif |
| /* if fd is non-zero, caller must call set_utimes() after close() */ |
| if (fd == 0 && set_utimes(to.p_path, fs)) |
| rval = 1; |
| return (rval); |
| } |
| |
| void |
| cp_usage(void) |
| { |
| (void)fprintf(stderr, |
| "usage: cp [-R [-H | -L | -P]] [-f | -i] [-alNpv] src target\n" |
| " cp [-R [-H | -L | -P]] [-f | -i] [-alNpv] src1 ... srcN directory\n"); |
| exit(1); |
| /* NOTREACHED */ |
| } |