/* $NetBSD: utils.c,v 1.49.6.1 2024/07/20 14:41:10 martin 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 #ifndef lint #if 0 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; #else __RCSID("$NetBSD: utils.c,v 1.49.6.1 2024/07/20 14:41:10 martin Exp $"); #endif #endif /* not lint */ #define _ACL_PRIVATE #include #include #include #include #ifndef SMALL #include #endif #include #include #include #include #include #include #include #include #include #include #include "extern.h" #define MMAP_MAX_SIZE (8 * 1048576) #define MMAP_MAX_WRITE (64 * 1024) int set_utimes(const char *file, struct stat *fs) { struct timespec ts[2]; ts[0] = fs->st_atimespec; ts[1] = fs->st_mtimespec; if (lutimens(file, ts)) { warn("lutimens: %s", file); return (1); } return (0); } struct finfo { const char *from; const char *to; off_t size; }; static void progress(const struct finfo *fi, off_t written) { int pcent = (int)((100.0 * written) / fi->size); pinfo = 0; (void)fprintf(stderr, "%s => %s %llu/%llu bytes %d%% written\n", fi->from, fi->to, (unsigned long long)written, (unsigned long long)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; off_t ptotal = 0; /* if hard linking then simply link and return */ if (lflag) { (void)unlink(to.p_path); if (link(entp->fts_path, to.p_path)) { warn("%s", to.p_path); return (1); } return (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; /* * We always copy regular files, even if they appear to be 0-sized * because kernfs and procfs don't return file sizes. */ bool need_copy = S_ISREG(fs->st_mode) || fs->st_size > 0; struct finfo fi; fi.from = entp->fts_path; fi.to = to.p_path; fi.size = 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. */ if (S_ISREG(fs->st_mode) && fs->st_size && 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; need_copy = 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 (need_copy) { 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; } } if (pflag && (fcpxattr(from_fd, to_fd) != 0)) warn("%s: error copying extended attributes", to.p_path); #ifndef SMALL if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) rval = 1; #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, islink; rval = 0; islink = S_ISLNK(fs->st_mode); 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); } if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { warn("chmod: %s", to.p_path); rval = 1; } 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; } } /* 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); } #ifndef SMALL 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); } #endif void usage(void) { (void)fprintf(stderr, "usage: %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src target\n" " %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src1 ... srcN directory\n", getprogname(), getprogname()); exit(1); /* NOTREACHED */ }