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+/* $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>
+
+#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"
+
+#ifndef BSD
+#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];
+
+#ifndef BSD
+ 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;
+
+ /* no madvise on noMMU
+ (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;
+ }
+ }
+ }
+
+ (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;
+#ifdef BSD
+ 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);
+ }
+#ifndef BSD
+ 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;
+ }
+
+#ifdef BSD
+ 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 */
+}
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