diff --git a/bin/cp/cp.c b/bin/cp/cp.c index 14d1cc2a3f75..02b879006a4f 100644 --- a/bin/cp/cp.c +++ b/bin/cp/cp.c @@ -1,579 +1,588 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1988, 1993, 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * David Hitz of Auspex Systems Inc. * * 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. */ /* * Cp copies source files to target files. * * The global PATH_T structure "to" always contains the path to the * current target file. Since fts(3) does not change directories, * this path can be either absolute or dot-relative. * * The basic algorithm is to initialize "to" and use fts(3) to traverse * the file hierarchy rooted in the argument list. A trivial case is the * case of 'cp file1 file2'. The more interesting case is the case of * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the * path (relative to the root of the traversal) is appended to dir (stored * in "to") to form the final target path. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "extern.h" #define STRIP_TRAILING_SLASH(p) { \ while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ *--(p).p_end = 0; \ } static char emptystring[] = ""; PATH_T to = { to.p_path, emptystring, "" }; int Nflag, fflag, iflag, lflag, nflag, pflag, sflag, vflag; static int Hflag, Lflag, Pflag, Rflag, rflag; volatile sig_atomic_t info; enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; static int copy(char *[], enum op, int, struct stat *); static void siginfo(int __unused); int main(int argc, char *argv[]) { struct stat to_stat, tmp_stat; enum op type; int ch, fts_options, r, have_trailing_slash; char *target; fts_options = FTS_NOCHDIR | FTS_PHYSICAL; while ((ch = getopt(argc, argv, "HLPRafilNnprsvx")) != -1) switch (ch) { case 'H': Hflag = 1; Lflag = Pflag = 0; break; case 'L': Lflag = 1; Hflag = Pflag = 0; break; case 'P': Pflag = 1; Hflag = Lflag = 0; break; case 'R': Rflag = 1; break; case 'a': pflag = 1; Rflag = 1; Pflag = 1; Hflag = Lflag = 0; break; case 'f': fflag = 1; iflag = nflag = 0; break; case 'i': iflag = 1; fflag = nflag = 0; break; case 'l': lflag = 1; break; case 'N': Nflag = 1; break; case 'n': nflag = 1; fflag = iflag = 0; break; case 'p': pflag = 1; break; case 'r': rflag = Lflag = 1; Hflag = Pflag = 0; break; case 's': sflag = 1; break; case 'v': vflag = 1; break; case 'x': fts_options |= FTS_XDEV; break; default: usage(); } argc -= optind; argv += optind; if (argc < 2) usage(); if (Rflag && rflag) errx(1, "the -R and -r options may not be specified together"); if (lflag && sflag) errx(1, "the -l and -s options may not be specified together"); if (rflag) Rflag = 1; if (Rflag) { if (Hflag) fts_options |= FTS_COMFOLLOW; if (Lflag) { fts_options &= ~FTS_PHYSICAL; fts_options |= FTS_LOGICAL; } } else if (!Pflag) { fts_options &= ~FTS_PHYSICAL; fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; } (void)signal(SIGINFO, siginfo); /* Save the target base in "to". */ target = argv[--argc]; if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) errx(1, "%s: name too long", target); to.p_end = to.p_path + strlen(to.p_path); if (to.p_path == to.p_end) { *to.p_end++ = '.'; *to.p_end = 0; } have_trailing_slash = (to.p_end[-1] == '/'); if (have_trailing_slash) STRIP_TRAILING_SLASH(to); to.target_end = to.p_end; /* Set end of argument list for fts(3). */ argv[argc] = NULL; /* * Cp has two distinct cases: * * cp [-R] source target * cp [-R] source1 ... sourceN directory * * In both cases, source can be either a file or a directory. * * In (1), the target becomes a copy of the source. That is, if the * source is a file, the target will be a file, and likewise for * directories. * * In (2), the real target is not directory, but "directory/source". */ r = stat(to.p_path, &to_stat); if (r == -1 && errno != ENOENT) err(1, "%s", to.p_path); if (r == -1 || !S_ISDIR(to_stat.st_mode)) { /* * Case (1). Target is not a directory. */ if (argc > 1) errx(1, "%s is not a directory", to.p_path); /* * Need to detect the case: * cp -R dir foo * Where dir is a directory and foo does not exist, where * we want pathname concatenations turned on but not for * the initial mkdir(). */ if (r == -1) { if (Rflag && (Lflag || Hflag)) stat(*argv, &tmp_stat); else lstat(*argv, &tmp_stat); if (S_ISDIR(tmp_stat.st_mode) && Rflag) type = DIR_TO_DNE; else type = FILE_TO_FILE; } else type = FILE_TO_FILE; if (have_trailing_slash && type == FILE_TO_FILE) { if (r == -1) { errx(1, "directory %s does not exist", to.p_path); } else errx(1, "%s is not a directory", to.p_path); } } else /* * Case (2). Target is a directory. */ type = FILE_TO_DIR; /* * For DIR_TO_DNE, we could provide copy() with the to_stat we've * already allocated on the stack here that isn't being used for * anything. Not doing so, though, simplifies later logic a little bit * as we need to skip checking root_stat on the first iteration and * ensure that we set it with the first mkdir(). */ exit (copy(argv, type, fts_options, (type == DIR_TO_DNE ? NULL : &to_stat))); } /* Does the right thing based on -R + -H/-L/-P */ static int copy_stat(const char *path, struct stat *sb) { /* * For -R -H/-P, we need to lstat() instead; copy() cares about the link * itself rather than the target if we're not following links during the * traversal. */ if (!Rflag || Lflag) return (stat(path, sb)); return (lstat(path, sb)); } static int copy(char *argv[], enum op type, int fts_options, struct stat *root_stat) { char rootname[NAME_MAX]; struct stat created_root_stat, to_stat; FTS *ftsp; FTSENT *curr; int base = 0, dne, badcp, rval; size_t nlen; char *p, *recurse_path, *target_mid; mode_t mask, mode; /* * Keep an inverted copy of the umask, for use in correcting * permissions on created directories when not using -p. */ mask = ~umask(0777); umask(~mask); recurse_path = NULL; if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) err(1, "fts_open"); for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { switch (curr->fts_info) { case FTS_NS: case FTS_DNR: case FTS_ERR: warnx("%s: %s", curr->fts_path, strerror(curr->fts_errno)); badcp = rval = 1; continue; case FTS_DC: /* Warn, continue. */ warnx("%s: directory causes a cycle", curr->fts_path); badcp = rval = 1; continue; default: ; } /* * Stash the root basename off for detecting recursion later. * * This will be essential if the root is a symlink and we're * rolling with -L or -H. The later bits will need this bit in * particular. */ if (curr->fts_level == FTS_ROOTLEVEL) { strlcpy(rootname, curr->fts_name, sizeof(rootname)); } /* * If we are in case (2) or (3) above, we need to append the * source name to the target name. */ if (type != FILE_TO_FILE) { /* * Need to remember the roots of traversals to create * correct pathnames. If there's a directory being * copied to a non-existent directory, e.g. * cp -R a/dir noexist * the resulting path name should be noexist/foo, not * noexist/dir/foo (where foo is a file in dir), which * is the case where the target exists. * * Also, check for "..". This is for correct path * concatenation for paths ending in "..", e.g. * cp -R .. /tmp * Paths ending in ".." are changed to ".". This is * tricky, but seems the easiest way to fix the problem. * * XXX * Since the first level MUST be FTS_ROOTLEVEL, base * is always initialized. */ if (curr->fts_level == FTS_ROOTLEVEL) { if (type != DIR_TO_DNE) { p = strrchr(curr->fts_path, '/'); base = (p == NULL) ? 0 : (int)(p - curr->fts_path + 1); if (!strcmp(&curr->fts_path[base], "..")) base += 1; } else base = curr->fts_pathlen; } p = &curr->fts_path[base]; nlen = curr->fts_pathlen - base; target_mid = to.target_end; if (*p != '/' && target_mid[-1] != '/') *target_mid++ = '/'; *target_mid = 0; if (target_mid - to.p_path + nlen >= PATH_MAX) { warnx("%s%s: name too long (not copied)", to.p_path, p); badcp = rval = 1; continue; } (void)strncat(target_mid, p, nlen); to.p_end = target_mid + nlen; *to.p_end = 0; STRIP_TRAILING_SLASH(to); /* * We're on the verge of recursing on ourselves. Either * we need to stop right here (we knowingly just created * it), or we will in an immediate descendant. Record * the path of the immediate descendant to make our * lives a little less complicated looking. */ if (curr->fts_info == FTS_D && root_stat != NULL && root_stat->st_dev == curr->fts_statp->st_dev && root_stat->st_ino == curr->fts_statp->st_ino) { assert(recurse_path == NULL); if (root_stat == &created_root_stat) { /* * This directory didn't exist when we * started, we created it as part of * traversal. Stop right here before we * do something silly. */ fts_set(ftsp, curr, FTS_SKIP); continue; } if (asprintf(&recurse_path, "%s/%s", to.p_path, rootname) == -1) err(1, "asprintf"); } if (recurse_path != NULL && strcmp(to.p_path, recurse_path) == 0) { fts_set(ftsp, curr, FTS_SKIP); continue; } } if (curr->fts_info == FTS_DP) { /* * We are nearly finished with this directory. If we * didn't actually copy it, or otherwise don't need to * change its attributes, then we are done. */ if (!curr->fts_number) continue; /* * If -p is in effect, set all the attributes. * Otherwise, set the correct permissions, limited * by the umask. Optimise by avoiding a chmod() * if possible (which is usually the case if we * made the directory). Note that mkdir() does not * honour setuid, setgid and sticky bits, but we * normally want to preserve them on directories. */ if (pflag) { if (setfile(curr->fts_statp, -1)) rval = 1; if (preserve_dir_acls(curr->fts_statp, curr->fts_accpath, to.p_path) != 0) rval = 1; } else { mode = curr->fts_statp->st_mode; if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || ((mode | S_IRWXU) & mask) != (mode & mask)) if (chmod(to.p_path, mode & mask) != 0) { warn("chmod: %s", to.p_path); rval = 1; } } continue; } /* Not an error but need to remember it happened. */ if (copy_stat(to.p_path, &to_stat) == -1) dne = 1; else { if (to_stat.st_dev == curr->fts_statp->st_dev && to_stat.st_ino == curr->fts_statp->st_ino) { warnx("%s and %s are identical (not copied).", to.p_path, curr->fts_path); badcp = rval = 1; if (S_ISDIR(curr->fts_statp->st_mode)) (void)fts_set(ftsp, curr, FTS_SKIP); continue; } if (!S_ISDIR(curr->fts_statp->st_mode) && S_ISDIR(to_stat.st_mode)) { warnx("cannot overwrite directory %s with " "non-directory %s", to.p_path, curr->fts_path); badcp = rval = 1; continue; } dne = 0; } switch (curr->fts_statp->st_mode & S_IFMT) { case S_IFLNK: /* Catch special case of a non-dangling symlink. */ if ((fts_options & FTS_LOGICAL) || ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { if (copy_file(curr, dne)) badcp = rval = 1; } else { if (copy_link(curr, !dne)) badcp = rval = 1; } break; case S_IFDIR: if (!Rflag) { warnx("%s is a directory (not copied).", curr->fts_path); (void)fts_set(ftsp, curr, FTS_SKIP); badcp = rval = 1; break; } /* * If the directory doesn't exist, create the new * one with the from file mode plus owner RWX bits, * modified by the umask. Trade-off between being * able to write the directory (if from directory is * 555) and not causing a permissions race. If the * umask blocks owner writes, we fail. */ if (dne) { - if (mkdir(to.p_path, - curr->fts_statp->st_mode | S_IRWXU) < 0) - err(1, "%s", to.p_path); + mode = curr->fts_statp->st_mode | S_IRWXU; + if (mkdir(to.p_path, mode) != 0) { + warn("%s", to.p_path); + (void)fts_set(ftsp, curr, FTS_SKIP); + badcp = rval = 1; + break; + } /* * First DNE with a NULL root_stat is the root * path, so set root_stat. We can't really * tell in all cases if the target path is * within the src path, so we just stat() the * first directory we created and use that. */ if (root_stat == NULL && - stat(to.p_path, &created_root_stat) == -1) { - err(1, "stat"); - } else if (root_stat == NULL) { - root_stat = &created_root_stat; + stat(to.p_path, &created_root_stat) != 0) { + warn("%s", to.p_path); + (void)fts_set(ftsp, curr, FTS_SKIP); + badcp = rval = 1; + break; } + if (root_stat == NULL) + root_stat = &created_root_stat; } else if (!S_ISDIR(to_stat.st_mode)) { - errno = ENOTDIR; - err(1, "%s", to.p_path); + warnc(ENOTDIR, "%s", to.p_path); + (void)fts_set(ftsp, curr, FTS_SKIP); + badcp = rval = 1; + break; } /* * Arrange to correct directory attributes later * (in the post-order phase) if this is a new * directory, or if the -p flag is in effect. */ curr->fts_number = pflag || dne; break; case S_IFBLK: case S_IFCHR: if (Rflag && !sflag) { if (copy_special(curr->fts_statp, !dne)) badcp = rval = 1; } else { if (copy_file(curr, dne)) badcp = rval = 1; } break; case S_IFSOCK: warnx("%s is a socket (not copied).", curr->fts_path); break; case S_IFIFO: if (Rflag && !sflag) { if (copy_fifo(curr->fts_statp, !dne)) badcp = rval = 1; } else { if (copy_file(curr, dne)) badcp = rval = 1; } break; default: if (copy_file(curr, dne)) badcp = rval = 1; break; } if (vflag && !badcp) (void)printf("%s -> %s\n", curr->fts_path, to.p_path); } if (errno) err(1, "fts_read"); fts_close(ftsp); free(recurse_path); return (rval); } static void siginfo(int sig __unused) { info = 1; }