diff --git a/bin/cp/utils.c b/bin/cp/utils.c index 80a0c1fce824..6c99d4c63f4a 100644 --- a/bin/cp/utils.c +++ b/bin/cp/utils.c @@ -1,523 +1,523 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * 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 #include #include #include #include #include #include #include #include #include #include #include #include "extern.h" #define cp_pct(x, y) ((y == 0) ? 0 : (int)(100.0 * (x) / (y))) /* * Memory strategy threshold, in pages: if physmem is larger then this, use a * large buffer. */ #define PHYSPAGES_THRESHOLD (32*1024) /* Maximum buffer size in bytes - do not allow it to grow larger than this. */ #define BUFSIZE_MAX (2*1024*1024) /* * Small (default) buffer size in bytes. It's inefficient for this to be * smaller than MAXPHYS. */ #define BUFSIZE_SMALL (MAXPHYS) /* * Prompt used in -i case. */ #define YESNO "(y/n [n]) " static ssize_t copy_fallback(int from_fd, int to_fd) { static char *buf = NULL; static size_t bufsize; ssize_t rcount, wresid, wcount = 0; char *bufp; if (buf == NULL) { if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD) bufsize = MIN(BUFSIZE_MAX, MAXPHYS * 8); else bufsize = BUFSIZE_SMALL; buf = malloc(bufsize); if (buf == NULL) err(1, "Not enough memory"); } rcount = read(from_fd, buf, bufsize); if (rcount <= 0) return (rcount); for (bufp = buf, wresid = rcount; ; bufp += wcount, wresid -= wcount) { wcount = write(to_fd, bufp, wresid); if (wcount <= 0) break; - if (wcount >= (ssize_t)wresid) + if (wcount >= wresid) break; } return (wcount < 0 ? wcount : rcount); } int copy_file(const FTSENT *entp, int dne) { struct stat *fs; ssize_t wcount; off_t wtotal; int ch, checkch, from_fd, rval, to_fd; int use_copy_file_range = 1; from_fd = to_fd = -1; if (!lflag && !sflag && (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) { if (nflag) { if (vflag) printf("%s not overwritten\n", to.p_path); rval = 1; goto done; } 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)fprintf(stderr, "not overwritten\n"); rval = 1; goto done; } } if (fflag) { /* remove existing destination file */ (void)unlink(to.p_path); dne = 1; } } rval = 0; if (lflag) { if (link(entp->fts_path, to.p_path) != 0) { warn("%s", to.p_path); rval = 1; } goto done; } if (sflag) { if (symlink(entp->fts_path, to.p_path) != 0) { warn("%s", to.p_path); rval = 1; } goto done; } if (!dne) { /* overwrite existing destination file */ to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); } else { /* create new destination file */ 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); rval = 1; goto done; } wtotal = 0; do { if (use_copy_file_range) { wcount = copy_file_range(from_fd, NULL, to_fd, NULL, SSIZE_MAX, 0); if (wcount < 0 && errno == EINVAL) { /* probably a non-seekable descriptor */ use_copy_file_range = 0; } } if (!use_copy_file_range) { wcount = copy_fallback(from_fd, to_fd); } wtotal += wcount; if (info) { info = 0; (void)fprintf(stderr, "%s -> %s %3d%%\n", entp->fts_path, to.p_path, cp_pct(wtotal, fs->st_size)); } } while (wcount > 0); if (wcount < 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; if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) rval = 1; if (close(to_fd)) { warn("%s", to.p_path); rval = 1; } done: if (from_fd != -1) (void)close(from_fd); return (rval); } int copy_link(const FTSENT *p, int exists) { ssize_t len; char llink[PATH_MAX]; if (exists && nflag) { if (vflag) printf("%s not overwritten\n", to.p_path); return (1); } if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { warn("readlink: %s", p->fts_path); return (1); } llink[len] = '\0'; if (exists && unlink(to.p_path)) { warn("unlink: %s", to.p_path); return (1); } if (symlink(llink, to.p_path)) { warn("symlink: %s", llink); return (1); } return (pflag ? setfile(p->fts_statp, -1) : 0); } int copy_fifo(struct stat *from_stat, int exists) { if (exists && nflag) { if (vflag) printf("%s not overwritten\n", to.p_path); return (1); } 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, -1) : 0); } int copy_special(struct stat *from_stat, int exists) { if (exists && nflag) { if (vflag) printf("%s not overwritten\n", to.p_path); return (1); } 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, -1) : 0); } int setfile(struct stat *fs, int fd) { static struct timespec tspec[2]; struct stat ts; int rval, gotstat, islink, fdval; rval = 0; fdval = fd != -1; islink = !fdval && S_ISLNK(fs->st_mode); fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO; tspec[0] = fs->st_atim; tspec[1] = fs->st_mtim; if (fdval ? futimens(fd, tspec) : utimensat(AT_FDCWD, to.p_path, tspec, islink ? AT_SYMLINK_NOFOLLOW : 0)) { warn("utimensat: %s", to.p_path); rval = 1; } if (fdval ? fstat(fd, &ts) : (islink ? lstat(to.p_path, &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 (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : (islink ? lchown(to.p_path, 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 (fdval ? fchmod(fd, fs->st_mode) : (islink ? lchmod(to.p_path, fs->st_mode) : chmod(to.p_path, fs->st_mode))) { warn("chmod: %s", to.p_path); rval = 1; } if (!Nflag && (!gotstat || fs->st_flags != ts.st_flags)) if (fdval ? fchflags(fd, fs->st_flags) : (islink ? lchflags(to.p_path, fs->st_flags) : chflags(to.p_path, fs->st_flags))) { /* * 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.) */ if (errno != EOPNOTSUPP || fs->st_flags != 0) { warn("chflags: %s", to.p_path); rval = 1; } } return (rval); } int preserve_fd_acls(int source_fd, int dest_fd) { acl_t acl; acl_type_t acl_type; int acl_supported = 0, ret, trivial; ret = fpathconf(source_fd, _PC_ACL_NFS4); if (ret > 0 ) { acl_supported = 1; acl_type = ACL_TYPE_NFS4; } else if (ret < 0 && errno != EINVAL) { warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", to.p_path); return (1); } if (acl_supported == 0) { ret = fpathconf(source_fd, _PC_ACL_EXTENDED); if (ret > 0 ) { acl_supported = 1; acl_type = ACL_TYPE_ACCESS; } else if (ret < 0 && errno != EINVAL) { warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", to.p_path); return (1); } } if (acl_supported == 0) return (0); acl = acl_get_fd_np(source_fd, acl_type); if (acl == NULL) { warn("failed to get acl entries while setting %s", to.p_path); return (1); } if (acl_is_trivial_np(acl, &trivial)) { warn("acl_is_trivial() failed for %s", to.p_path); acl_free(acl); return (1); } if (trivial) { acl_free(acl); return (0); } if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { warn("failed to set acl entries for %s", to.p_path); acl_free(acl); return (1); } acl_free(acl); return (0); } int preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) { acl_t (*aclgetf)(const char *, acl_type_t); int (*aclsetf)(const char *, acl_type_t, acl_t); struct acl *aclp; acl_t acl; acl_type_t acl_type; int acl_supported = 0, ret, trivial; ret = pathconf(source_dir, _PC_ACL_NFS4); if (ret > 0) { acl_supported = 1; acl_type = ACL_TYPE_NFS4; } else if (ret < 0 && errno != EINVAL) { warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", source_dir); return (1); } if (acl_supported == 0) { ret = pathconf(source_dir, _PC_ACL_EXTENDED); if (ret > 0) { acl_supported = 1; acl_type = ACL_TYPE_ACCESS; } else if (ret < 0 && errno != EINVAL) { warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", source_dir); return (1); } } if (acl_supported == 0) return (0); /* * If the file is a link we will not follow it. */ if (S_ISLNK(fs->st_mode)) { aclgetf = acl_get_link_np; aclsetf = acl_set_link_np; } else { aclgetf = acl_get_file; aclsetf = acl_set_file; } if (acl_type == ACL_TYPE_ACCESS) { /* * Even if there is no ACL_TYPE_DEFAULT entry here, a zero * size ACL will be returned. So it is not safe to simply * check the pointer to see if the default ACL is present. */ acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); if (acl == NULL) { warn("failed to get default acl entries on %s", source_dir); return (1); } aclp = &acl->ats_acl; if (aclp->acl_cnt != 0 && aclsetf(dest_dir, ACL_TYPE_DEFAULT, acl) < 0) { warn("failed to set default acl entries on %s", dest_dir); acl_free(acl); return (1); } acl_free(acl); } acl = aclgetf(source_dir, acl_type); if (acl == NULL) { warn("failed to get acl entries on %s", source_dir); return (1); } if (acl_is_trivial_np(acl, &trivial)) { warn("acl_is_trivial() failed on %s", source_dir); acl_free(acl); return (1); } if (trivial) { acl_free(acl); return (0); } if (aclsetf(dest_dir, acl_type, acl) < 0) { warn("failed to set acl entries on %s", dest_dir); acl_free(acl); return (1); } acl_free(acl); return (0); } void usage(void) { (void)fprintf(stderr, "%s\n%s\n", "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " "source_file target_file", " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " "source_file ... " "target_directory"); exit(EX_USAGE); }