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Diffstat (limited to 'i/pc104/initrd/conf/busybox/libbb/copy_file.c')
-rw-r--r--i/pc104/initrd/conf/busybox/libbb/copy_file.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/libbb/copy_file.c b/i/pc104/initrd/conf/busybox/libbb/copy_file.c
new file mode 100644
index 0000000..7d85920
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/libbb/copy_file.c
@@ -0,0 +1,343 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini copy_file implementation for busybox
+ *
+ * Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
+ * SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ *
+ */
+
+#include "libbb.h"
+
+// POSIX: if exists and -i, ask (w/o -i assume yes).
+// Then open w/o EXCL (yes, not unlink!).
+// If open still fails and -f, try unlink, then try open again.
+// Result: a mess:
+// If dest is a softlink, we overwrite softlink's destination!
+// (or fail, if it points to dir/nonexistent location/etc).
+// This is strange, but POSIX-correct.
+// coreutils cp has --remove-destination to override this...
+
+#define DO_POSIX_CP 0 /* 1 - POSIX behavior, 0 - safe behavior */
+
+
+static int ask_and_unlink(const char *dest, int flags)
+{
+ // If !DO_POSIX_CP, act as if -f is always in effect - we don't want
+ // "'file' exists" msg, we want unlink to be done (silently unless -i
+ // is also in effect).
+ // This prevents safe way from asking more questions than POSIX does.
+#if DO_POSIX_CP
+ if (!(flags & (FILEUTILS_FORCE|FILEUTILS_INTERACTIVE))) {
+ fprintf(stderr, "'%s' exists\n", dest);
+ return -1;
+ }
+#endif
+
+ // TODO: maybe we should do it only if ctty is present?
+ if (flags & FILEUTILS_INTERACTIVE) {
+ // We would not do POSIX insanity. -i asks,
+ // then _unlinks_ the offender. Presto.
+ // (No opening without O_EXCL, no unlinks only if -f)
+ // Or else we will end up having 3 open()s!
+ fprintf(stderr, "%s: overwrite '%s'? ", applet_name, dest);
+ if (!bb_ask_confirmation())
+ return 0; // not allowed to overwrite
+ }
+ if (unlink(dest) < 0) {
+ bb_perror_msg("cannot remove '%s'", dest);
+ return -1; // error
+ }
+ return 1; // ok (to try again)
+}
+
+/* Return:
+ * -1 error, copy not made
+ * 0 copy is made or user answered "no" in interactive mode
+ * (failures to preserve mode/owner/times are not reported in exit code)
+ */
+int copy_file(const char *source, const char *dest, int flags)
+{
+ struct stat source_stat;
+ struct stat dest_stat;
+ int status = 0;
+ signed char dest_exists = 0;
+ signed char ovr;
+
+#define FLAGS_DEREF (flags & FILEUTILS_DEREFERENCE)
+
+ if ((FLAGS_DEREF ? stat : lstat)(source, &source_stat) < 0) {
+ // This may be a dangling symlink.
+ // Making [sym]links to dangling symlinks works, so...
+ if (flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK))
+ goto make_links;
+ bb_perror_msg("cannot stat '%s'", source);
+ return -1;
+ }
+
+ if (lstat(dest, &dest_stat) < 0) {
+ if (errno != ENOENT) {
+ bb_perror_msg("cannot stat '%s'", dest);
+ return -1;
+ }
+ } else {
+ if (source_stat.st_dev == dest_stat.st_dev
+ && source_stat.st_ino == dest_stat.st_ino
+ ) {
+ bb_error_msg("'%s' and '%s' are the same file", source, dest);
+ return -1;
+ }
+ dest_exists = 1;
+ }
+
+#if ENABLE_SELINUX
+ if ((flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT) && is_selinux_enabled() > 0) {
+ security_context_t con;
+ if (lgetfilecon(source, &con) >= 0) {
+ if (setfscreatecon(con) < 0) {
+ bb_perror_msg("cannot set setfscreatecon %s", con);
+ freecon(con);
+ return -1;
+ }
+ } else if (errno == ENOTSUP || errno == ENODATA) {
+ setfscreatecon_or_die(NULL);
+ } else {
+ bb_perror_msg("cannot lgetfilecon %s", source);
+ return -1;
+ }
+ }
+#endif
+
+ if (S_ISDIR(source_stat.st_mode)) {
+ DIR *dp;
+ struct dirent *d;
+ mode_t saved_umask = 0;
+
+ if (!(flags & FILEUTILS_RECUR)) {
+ bb_error_msg("omitting directory '%s'", source);
+ return -1;
+ }
+
+ /* Create DEST. */
+ if (dest_exists) {
+ if (!S_ISDIR(dest_stat.st_mode)) {
+ bb_error_msg("target '%s' is not a directory", dest);
+ return -1;
+ }
+ } else {
+ mode_t mode;
+ saved_umask = umask(0);
+
+ mode = source_stat.st_mode;
+ if (!(flags & FILEUTILS_PRESERVE_STATUS))
+ mode = source_stat.st_mode & ~saved_umask;
+ mode |= S_IRWXU;
+
+ if (mkdir(dest, mode) < 0) {
+ umask(saved_umask);
+ bb_perror_msg("cannot create directory '%s'", dest);
+ return -1;
+ }
+
+ umask(saved_umask);
+ }
+
+ /* Recursively copy files in SOURCE. */
+ dp = opendir(source);
+ if (dp == NULL) {
+ status = -1;
+ goto preserve_status;
+ }
+
+ while ((d = readdir(dp)) != NULL) {
+ char *new_source, *new_dest;
+
+ new_source = concat_subpath_file(source, d->d_name);
+ if (new_source == NULL)
+ continue;
+ new_dest = concat_path_file(dest, d->d_name);
+ if (copy_file(new_source, new_dest, flags) < 0)
+ status = -1;
+ free(new_source);
+ free(new_dest);
+ }
+ closedir(dp);
+
+ if (!dest_exists
+ && chmod(dest, source_stat.st_mode & ~saved_umask) < 0
+ ) {
+ bb_perror_msg("cannot change permissions of '%s'", dest);
+ status = -1;
+ }
+
+ } else if (flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK)) {
+ int (*lf)(const char *oldpath, const char *newpath);
+ make_links:
+ // Hmm... maybe
+ // if (DEREF && MAKE_SOFTLINK) source = realpath(source) ?
+ // (but realpath returns NULL on dangling symlinks...)
+ lf = (flags & FILEUTILS_MAKE_SOFTLINK) ? symlink : link;
+ if (lf(source, dest) < 0) {
+ ovr = ask_and_unlink(dest, flags);
+ if (ovr <= 0)
+ return ovr;
+ if (lf(source, dest) < 0) {
+ bb_perror_msg("cannot create link '%s'", dest);
+ return -1;
+ }
+ }
+ return 0;
+
+ } else if (S_ISREG(source_stat.st_mode)
+ /* Huh? DEREF uses stat, which never returns links! */
+ /* || (FLAGS_DEREF && S_ISLNK(source_stat.st_mode)) */
+ ) {
+ int src_fd;
+ int dst_fd;
+ if (ENABLE_FEATURE_PRESERVE_HARDLINKS) {
+ char *link_name;
+
+ if (!FLAGS_DEREF) {
+ link_name = is_in_ino_dev_hashtable(&source_stat);
+ if (link_name) {
+ if (link(link_name, dest) < 0) {
+ ovr = ask_and_unlink(dest, flags);
+ if (ovr <= 0)
+ return ovr;
+ if (link(link_name, dest) < 0) {
+ bb_perror_msg("cannot create link '%s'", dest);
+ return -1;
+ }
+ }
+ return 0;
+ }
+ }
+ add_to_ino_dev_hashtable(&source_stat, dest);
+ }
+
+ src_fd = open(source, O_RDONLY);
+ if (src_fd == -1) {
+ bb_perror_msg("cannot open '%s'", source);
+ return -1;
+ }
+
+#if DO_POSIX_CP /* POSIX way (a security problem versus symlink attacks!): */
+ dst_fd = open(dest, (flags & FILEUTILS_INTERACTIVE)
+ ? O_WRONLY|O_CREAT|O_EXCL
+ : O_WRONLY|O_CREAT|O_TRUNC, source_stat.st_mode);
+#else /* safe way: */
+ dst_fd = open(dest, O_WRONLY|O_CREAT|O_EXCL, source_stat.st_mode);
+#endif
+ if (dst_fd == -1) {
+ ovr = ask_and_unlink(dest, flags);
+ if (ovr <= 0) {
+ close(src_fd);
+ return ovr;
+ }
+ /* It shouldn't exist. If it exists, do not open (symlink attack?) */
+ dst_fd = open(dest, O_WRONLY|O_CREAT|O_EXCL, source_stat.st_mode);
+ if (dst_fd == -1) {
+ bb_perror_msg("cannot open '%s'", dest);
+ close(src_fd);
+ return -1;
+ }
+ }
+
+#if ENABLE_SELINUX
+ if (((flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT)
+ || (flags & FILEUTILS_SET_SECURITY_CONTEXT))
+ && is_selinux_enabled() > 0
+ ) {
+ security_context_t con;
+ if (getfscreatecon(&con) == -1) {
+ bb_perror_msg("getfscreatecon");
+ return -1;
+ }
+ if (con) {
+ if(setfilecon(dest, con) == -1) {
+ bb_perror_msg("setfilecon:%s,%s", dest, con);
+ freecon(con);
+ return -1;
+ }
+ freecon(con);
+ }
+ }
+#endif
+ if (bb_copyfd_eof(src_fd, dst_fd) == -1)
+ status = -1;
+ if (close(dst_fd) < 0) {
+ bb_perror_msg("cannot close '%s'", dest);
+ status = -1;
+ }
+ if (close(src_fd) < 0) {
+ bb_perror_msg("cannot close '%s'", source);
+ status = -1;
+ }
+
+ } else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode)
+ || S_ISSOCK(source_stat.st_mode) || S_ISFIFO(source_stat.st_mode)
+ || S_ISLNK(source_stat.st_mode)
+ ) {
+ // We are lazy here, a bit lax with races...
+ if (dest_exists) {
+ ovr = ask_and_unlink(dest, flags);
+ if (ovr <= 0)
+ return ovr;
+ }
+ if (S_ISFIFO(source_stat.st_mode)) {
+ if (mkfifo(dest, source_stat.st_mode) < 0) {
+ bb_perror_msg("cannot create fifo '%s'", dest);
+ return -1;
+ }
+ } else if (S_ISLNK(source_stat.st_mode)) {
+ char *lpath;
+
+ lpath = xmalloc_readlink_or_warn(source);
+ if (lpath && symlink(lpath, dest) < 0) {
+ bb_perror_msg("cannot create symlink '%s'", dest);
+ free(lpath);
+ return -1;
+ }
+ free(lpath);
+
+ if (flags & FILEUTILS_PRESERVE_STATUS)
+ if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0)
+ bb_perror_msg("cannot preserve %s of '%s'", "ownership", dest);
+
+ return 0;
+
+ } else {
+ if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) {
+ bb_perror_msg("cannot create '%s'", dest);
+ return -1;
+ }
+ }
+ } else {
+ bb_error_msg("internal error: unrecognized file type");
+ return -1;
+ }
+
+ preserve_status:
+
+ if (flags & FILEUTILS_PRESERVE_STATUS
+ /* Cannot happen: */
+ /* && !(flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK)) */
+ ) {
+ struct utimbuf times;
+
+ times.actime = source_stat.st_atime;
+ times.modtime = source_stat.st_mtime;
+ if (utime(dest, &times) < 0)
+ bb_perror_msg("cannot preserve %s of '%s'", "times", dest);
+ if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) {
+ source_stat.st_mode &= ~(S_ISUID | S_ISGID);
+ bb_perror_msg("cannot preserve %s of '%s'", "ownership", dest);
+ }
+ if (chmod(dest, source_stat.st_mode) < 0)
+ bb_perror_msg("cannot preserve %s of '%s'", "permissions", dest);
+ }
+
+ return status;
+}