/* $OpenBSD: cp.c,v 1.28 2003/10/30 16:01:43 millert Exp $ */ /* $NetBSD: cp.c,v 1.14 1995/09/07 06:14:51 jtc Exp $ */ /* * 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. */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1988, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95"; #else static char rcsid[] = "$OpenBSD: cp.c,v 1.28 2003/10/30 16:01:43 millert Exp $"; #endif #endif /* not lint */ /* * 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 #include #include "extern.h" #define fts_dne(_x) (_x->fts_pointer != NULL) PATH_T to = { to.p_path, "" }; uid_t myuid; int Rflag, fflag, iflag, pflag, rflag; int myumask; enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; int copy(char *[], enum op, int); int mastercmp(const FTSENT **, const FTSENT **); char *find_last_component(char *); int main(int argc, char *argv[]) { struct stat to_stat, tmp_stat; enum op type; int Hflag, Lflag, Pflag, ch, fts_options, r; char *target; (void)setlocale(LC_ALL, ""); Hflag = Lflag = Pflag = Rflag = 0; while ((ch = getopt(argc, argv, "HLPRfipr")) != -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 'f': fflag = 1; iflag = 0; break; case 'i': iflag = isatty(fileno(stdin)); fflag = 0; break; case 'p': pflag = 1; break; case 'r': rflag = 1; break; default: usage(); break; } argc -= optind; argv += optind; if (argc < 2) usage(); fts_options = FTS_NOCHDIR | FTS_PHYSICAL; if (rflag) { if (Rflag) errx(1, "the -R and -r options may not be specified together."); if (Hflag || Lflag || Pflag) errx(1, "the -H, -L, and -P options may not be specified with the -r option."); fts_options &= ~FTS_PHYSICAL; fts_options |= FTS_LOGICAL; } if (Rflag) { if (Hflag) fts_options |= FTS_COMFOLLOW; if (Lflag) { fts_options &= ~FTS_PHYSICAL; fts_options |= FTS_LOGICAL; } } else { fts_options &= ~FTS_PHYSICAL; fts_options |= FTS_LOGICAL; } myuid = getuid(); /* Copy the umask for explicit mode setting. */ myumask = umask(0); (void)umask(myumask); /* 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'; } 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) usage(); /* * 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 || (Rflag && (Lflag || Hflag))) stat(*argv, &tmp_stat); else lstat(*argv, &tmp_stat); if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) type = DIR_TO_DNE; else type = FILE_TO_FILE; } else type = FILE_TO_FILE; } else /* * Case (2). Target is a directory. */ type = FILE_TO_DIR; exit (copy(argv, type, fts_options)); } char * find_last_component(char *path) { char *p; if ((p = strrchr(path, '/')) == NULL) p = path; else { /* Special case foo/ */ if (!*(p+1)) { while ((p >= path) && *p == '/') p--; while ((p >= path) && *p != '/') p--; } p++; } return (p); } int copy(char *argv[], enum op type, int fts_options) { struct stat to_stat; FTS *ftsp; FTSENT *curr; int base, nlen, rval; char *p, *target_mid; #ifdef lint base = 0; #endif if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) err(1, NULL); for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { switch (curr->fts_info) { case FTS_NS: case FTS_ERR: warnx("%s: %s", curr->fts_path, strerror(curr->fts_errno)); rval = 1; continue; case FTS_DC: warnx("%s: directory causes a cycle", curr->fts_path); rval = 1; continue; } /* * 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 = find_last_component(curr->fts_path); base = p - curr->fts_path; 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 >= MAXPATHLEN) { warnx("%s%s: name too long (not copied)", to.p_path, p); rval = 1; continue; } (void)strncat(target_mid, p, nlen); to.p_end = target_mid + nlen; *to.p_end = '\0'; } /* Not an error but need to remember it happened */ if (stat(to.p_path, &to_stat) == -1) { if (curr->fts_info == FTS_DP) continue; /* * We use fts_pointer as a boolean to indicate that * we created this directory ourselves. We'll use * this later on via the fts_dne macro to decide * whether or not to set the directory mode during * the post-order pass. */ curr->fts_pointer = (void *)1; } else { /* * Set directory mode/user/times on the post-order * pass. We can't do this earlier because the mode * may not allow us write permission. Furthermore, * if we set the times during the pre-order pass, * they will get changed later when the directory * is populated. */ if (curr->fts_info == FTS_DP) { if (!S_ISDIR(to_stat.st_mode)) continue; /* * If not -p and directory didn't exist, set * it to be the same as the from directory, * unmodified by the umask; arguably wrong, * but it's been that way forever. */ if (pflag && setfile(curr->fts_statp, 0)) rval = 1; else if (fts_dne(curr)) (void)chmod(to.p_path, curr->fts_statp->st_mode); continue; } 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); 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); rval = 1; continue; } } switch (curr->fts_statp->st_mode & S_IFMT) { case S_IFLNK: if (copy_link(curr, !fts_dne(curr))) rval = 1; break; case S_IFDIR: if (!Rflag && !rflag) { warnx("%s is a directory (not copied).", curr->fts_path); (void)fts_set(ftsp, curr, FTS_SKIP); 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 (fts_dne(curr)) { if (mkdir(to.p_path, curr->fts_statp->st_mode | S_IRWXU) < 0) err(1, "%s", to.p_path); } else if (!S_ISDIR(to_stat.st_mode)) { errno = ENOTDIR; err(1, "%s", to.p_path); } break; case S_IFBLK: case S_IFCHR: if (Rflag) { if (copy_special(curr->fts_statp, !fts_dne(curr))) rval = 1; } else if (copy_file(curr, fts_dne(curr))) rval = 1; break; case S_IFIFO: if (Rflag) { if (copy_fifo(curr->fts_statp, !fts_dne(curr))) rval = 1; } else if (copy_file(curr, fts_dne(curr))) rval = 1; break; default: if (copy_file(curr, fts_dne(curr))) rval = 1; break; } } if (errno) err(1, "fts_read"); return (rval); } /* * mastercmp -- * The comparison function for the copy order. The order is to copy * non-directory files before directory files. The reason for this * is because files tend to be in the same cylinder group as their * parent directory, whereas directories tend not to be. Copying the * files first reduces seeking. */ int mastercmp(const FTSENT **a, const FTSENT **b) { int a_info, b_info; a_info = (*a)->fts_info; if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) return (0); b_info = (*b)->fts_info; if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) return (0); if (a_info == FTS_D) return (-1); if (b_info == FTS_D) return (1); return (0); }