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-rw-r--r--libmisc/copydir.c839
1 files changed, 839 insertions, 0 deletions
diff --git a/libmisc/copydir.c b/libmisc/copydir.c
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+++ b/libmisc/copydir.c
@@ -0,0 +1,839 @@
+/*
+ * Copyright (c) 1991 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2001, Marek Michałkiewicz
+ * Copyright (c) 2003 - 2006, Tomasz Kłoczko
+ * Copyright (c) 2007 - 2010, Nicolas François
+ * 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. The name of the copyright holders or contributors may not be used to
+ * endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ * HOLDERS 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 <config.h>
+
+#ident "$Id$"
+
+#include <assert.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include "prototypes.h"
+#include "defines.h"
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#endif /* WITH_SELINUX */
+#if defined(WITH_ACL) || defined(WITH_ATTR)
+#include <stdarg.h>
+#include <attr/error_context.h>
+#endif /* WITH_ACL || WITH_ATTR */
+#ifdef WITH_ACL
+#include <acl/libacl.h>
+#endif /* WITH_ACL */
+#ifdef WITH_ATTR
+#include <attr/libattr.h>
+#endif /* WITH_ATTR */
+
+
+static /*@null@*/const char *src_orig;
+static /*@null@*/const char *dst_orig;
+
+struct link_name {
+ dev_t ln_dev;
+ ino_t ln_ino;
+ nlink_t ln_count;
+ char *ln_name;
+ /*@dependent@*/struct link_name *ln_next;
+};
+static /*@exposed@*/struct link_name *links;
+
+static int copy_entry (const char *src, const char *dst,
+ bool reset_selinux,
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid);
+static int copy_dir (const char *src, const char *dst,
+ bool reset_selinux,
+ const struct stat *statp, const struct timeval mt[],
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid);
+#ifdef S_IFLNK
+static /*@null@*/char *readlink_malloc (const char *filename);
+static int copy_symlink (const char *src, const char *dst,
+ unused bool reset_selinux,
+ const struct stat *statp, const struct timeval mt[],
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid);
+#endif /* S_IFLNK */
+static int copy_hardlink (const char *dst,
+ unused bool reset_selinux,
+ struct link_name *lp);
+static int copy_special (const char *src, const char *dst,
+ bool reset_selinux,
+ const struct stat *statp, const struct timeval mt[],
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid);
+static int copy_file (const char *src, const char *dst,
+ bool reset_selinux,
+ const struct stat *statp, const struct timeval mt[],
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid);
+static int chown_if_needed (const char *dst, const struct stat *statp,
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid);
+static int lchown_if_needed (const char *dst, const struct stat *statp,
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid);
+static int fchown_if_needed (int fdst, const struct stat *statp,
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid);
+
+#if defined(WITH_ACL) || defined(WITH_ATTR)
+/*
+ * error_acl - format the error messages for the ACL and EQ libraries.
+ */
+static void error_acl (struct error_context *ctx, const char *fmt, ...)
+{
+ va_list ap;
+
+ /* ignore the case when destination does not support ACLs
+ * or extended attributes */
+ if (ENOTSUP == errno) {
+ errno = 0;
+ return;
+ }
+
+ va_start (ap, fmt);
+ (void) fprintf (stderr, _("%s: "), Prog);
+ if (vfprintf (stderr, fmt, ap) != 0) {
+ (void) fputs (_(": "), stderr);
+ }
+ (void) fprintf (stderr, "%s\n", strerror (errno));
+ va_end (ap);
+}
+
+static struct error_context ctx = {
+ error_acl
+};
+#endif /* WITH_ACL || WITH_ATTR */
+
+/*
+ * remove_link - delete a link from the linked list
+ */
+static void remove_link (/*@only@*/struct link_name *ln)
+{
+ struct link_name *lp;
+
+ if (links == ln) {
+ links = ln->ln_next;
+ free (ln->ln_name);
+ free (ln);
+ return;
+ }
+ for (lp = links; NULL !=lp; lp = lp->ln_next) {
+ if (lp->ln_next == ln) {
+ break;
+ }
+ }
+
+ if (NULL == lp) {
+ free (ln->ln_name);
+ free (ln);
+ return;
+ }
+
+ lp->ln_next = lp->ln_next->ln_next;
+ free (ln->ln_name);
+ free (ln);
+}
+
+/*
+ * check_link - see if a file is really a link
+ */
+
+static /*@exposed@*/ /*@null@*/struct link_name *check_link (const char *name, const struct stat *sb)
+{
+ struct link_name *lp;
+ size_t src_len;
+ size_t dst_len;
+ size_t name_len;
+ size_t len;
+
+ /* copy_tree () must be the entry point */
+ assert (NULL != src_orig);
+ assert (NULL != dst_orig);
+
+ for (lp = links; NULL != lp; lp = lp->ln_next) {
+ if ((lp->ln_dev == sb->st_dev) && (lp->ln_ino == sb->st_ino)) {
+ return lp;
+ }
+ }
+
+ if (sb->st_nlink == 1) {
+ return NULL;
+ }
+
+ lp = (struct link_name *) xmalloc (sizeof *lp);
+ src_len = strlen (src_orig);
+ dst_len = strlen (dst_orig);
+ name_len = strlen (name);
+ lp->ln_dev = sb->st_dev;
+ lp->ln_ino = sb->st_ino;
+ lp->ln_count = sb->st_nlink;
+ len = name_len - src_len + dst_len + 1;
+ lp->ln_name = (char *) xmalloc (len);
+ (void) snprintf (lp->ln_name, len, "%s%s", dst_orig, name + src_len);
+ lp->ln_next = links;
+ links = lp;
+
+ return NULL;
+}
+
+/*
+ * copy_tree - copy files in a directory tree
+ *
+ * copy_tree() walks a directory tree and copies ordinary files
+ * as it goes.
+ *
+ * When reset_selinux is enabled, extended attributes (and thus
+ * SELinux attributes) are not copied.
+ *
+ * old_uid and new_uid are used to set the ownership of the copied
+ * files. Unless old_uid is set to -1, only the files owned by
+ * old_uid have their ownership changed to new_uid. In addition, if
+ * new_uid is set to -1, no ownership will be changed.
+ *
+ * The same logic applies for the group-ownership and
+ * old_gid/new_gid.
+ */
+int copy_tree (const char *src_root, const char *dst_root,
+ bool copy_root, bool reset_selinux,
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid)
+{
+ int err = 0;
+ bool set_orig = false;
+ struct DIRECT *ent;
+ DIR *dir;
+
+ if (copy_root) {
+ struct stat sb;
+ if (access (dst_root, F_OK) == 0) {
+ return -1;
+ }
+
+ if (LSTAT (src_root, &sb) == -1) {
+ return -1;
+ }
+
+ if (!S_ISDIR (sb.st_mode)) {
+ fprintf (stderr,
+ "%s: %s is not a directory",
+ Prog, src_root);
+ return -1;
+ }
+
+ return copy_entry (src_root, dst_root, reset_selinux,
+ old_uid, new_uid, old_gid, new_gid);
+ }
+
+ /*
+ * Make certain both directories exist. This routine is called
+ * after the home directory is created, or recursively after the
+ * target is created. It assumes the target directory exists.
+ */
+
+ if ( (access (src_root, F_OK) != 0)
+ || (access (dst_root, F_OK) != 0)) {
+ return -1;
+ }
+
+ /*
+ * Open the source directory and read each entry. Every file
+ * entry in the directory is copied with the UID and GID set
+ * to the provided values. As an added security feature only
+ * regular files (and directories ...) are copied, and no file
+ * is made set-ID.
+ */
+ dir = opendir (src_root);
+ if (NULL == dir) {
+ return -1;
+ }
+
+ if (src_orig == NULL) {
+ src_orig = src_root;
+ dst_orig = dst_root;
+ set_orig = true;
+ }
+ while ((0 == err) && (ent = readdir (dir)) != NULL) {
+ /*
+ * Skip the "." and ".." entries
+ */
+ if ((strcmp (ent->d_name, ".") != 0) &&
+ (strcmp (ent->d_name, "..") != 0)) {
+ char *src_name;
+ char *dst_name;
+ size_t src_len = strlen (ent->d_name) + 2;
+ size_t dst_len = strlen (ent->d_name) + 2;
+ src_len += strlen (src_root);
+ dst_len += strlen (dst_root);
+
+ src_name = (char *) malloc (src_len);
+ dst_name = (char *) malloc (dst_len);
+
+ if ((NULL == src_name) || (NULL == dst_name)) {
+ err = -1;
+ } else {
+ /*
+ * Build the filename for both the source and
+ * the destination files.
+ */
+ (void) snprintf (src_name, src_len, "%s/%s",
+ src_root, ent->d_name);
+ (void) snprintf (dst_name, dst_len, "%s/%s",
+ dst_root, ent->d_name);
+
+ err = copy_entry (src_name, dst_name,
+ reset_selinux,
+ old_uid, new_uid,
+ old_gid, new_gid);
+ }
+ if (NULL != src_name) {
+ free (src_name);
+ }
+ if (NULL != dst_name) {
+ free (dst_name);
+ }
+ }
+ }
+ (void) closedir (dir);
+
+ if (set_orig) {
+ src_orig = NULL;
+ dst_orig = NULL;
+ /* FIXME: clean links
+ * Since there can be hardlinks elsewhere on the device,
+ * we cannot check that all the hardlinks were found:
+ assert (NULL == links);
+ */
+ }
+
+#ifdef WITH_SELINUX
+ /* Reset SELinux to create files with default contexts.
+ * Note that the context is only reset on exit of copy_tree (it is
+ * assumed that the program would quit without needing a restored
+ * context if copy_tree failed previously), and that copy_tree can
+ * be called recursively (hence the context is set on the
+ * sub-functions of copy_entry).
+ */
+ if (reset_selinux_file_context () != 0) {
+ err = -1;
+ }
+#endif /* WITH_SELINUX */
+
+ return err;
+}
+
+/*
+ * copy_entry - copy the entry of a directory
+ *
+ * Copy the entry src to dst.
+ * Depending on the type of entry, this function will forward the
+ * request to copy_dir(), copy_symlink(), copy_hardlink(),
+ * copy_special(), or copy_file().
+ *
+ * The access and modification time will not be modified.
+ *
+ * The permissions will be set to new_uid/new_gid.
+ *
+ * If new_uid (resp. new_gid) is equal to -1, the user (resp. group) will
+ * not be modified.
+ *
+ * Only the files owned (resp. group-owned) by old_uid (resp.
+ * old_gid) will be modified, unless old_uid (resp. old_gid) is set
+ * to -1.
+ */
+static int copy_entry (const char *src, const char *dst,
+ bool reset_selinux,
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid)
+{
+ int err = 0;
+ struct stat sb;
+ struct link_name *lp;
+ struct timeval mt[2];
+
+ if (LSTAT (src, &sb) == -1) {
+ /* If we cannot stat the file, do not care. */
+ } else {
+#ifdef HAVE_STRUCT_STAT_ST_ATIM
+ mt[0].tv_sec = sb.st_atim.tv_sec;
+ mt[0].tv_usec = sb.st_atim.tv_nsec / 1000;
+#else /* !HAVE_STRUCT_STAT_ST_ATIM */
+ mt[0].tv_sec = sb.st_atime;
+# ifdef HAVE_STRUCT_STAT_ST_ATIMENSEC
+ mt[0].tv_usec = sb.st_atimensec / 1000;
+# else /* !HAVE_STRUCT_STAT_ST_ATIMENSEC */
+ mt[0].tv_usec = 0;
+# endif /* !HAVE_STRUCT_STAT_ST_ATIMENSEC */
+#endif /* !HAVE_STRUCT_STAT_ST_ATIM */
+
+#ifdef HAVE_STRUCT_STAT_ST_MTIM
+ mt[1].tv_sec = sb.st_mtim.tv_sec;
+ mt[1].tv_usec = sb.st_mtim.tv_nsec / 1000;
+#else /* !HAVE_STRUCT_STAT_ST_MTIM */
+ mt[1].tv_sec = sb.st_mtime;
+# ifdef HAVE_STRUCT_STAT_ST_MTIMENSEC
+ mt[1].tv_usec = sb.st_mtimensec / 1000;
+# else /* !HAVE_STRUCT_STAT_ST_MTIMENSEC */
+ mt[1].tv_usec = 0;
+# endif /* !HAVE_STRUCT_STAT_ST_MTIMENSEC */
+#endif /* !HAVE_STRUCT_STAT_ST_MTIM */
+
+ if (S_ISDIR (sb.st_mode)) {
+ err = copy_dir (src, dst, reset_selinux, &sb, mt,
+ old_uid, new_uid, old_gid, new_gid);
+ }
+
+#ifdef S_IFLNK
+ /*
+ * Copy any symbolic links
+ */
+
+ else if (S_ISLNK (sb.st_mode)) {
+ err = copy_symlink (src, dst, reset_selinux, &sb, mt,
+ old_uid, new_uid, old_gid, new_gid);
+ }
+#endif /* S_IFLNK */
+
+ /*
+ * See if this is a previously copied link
+ */
+
+ else if ((lp = check_link (src, &sb)) != NULL) {
+ err = copy_hardlink (dst, reset_selinux, lp);
+ }
+
+ /*
+ * Deal with FIFOs and special files. The user really
+ * shouldn't have any of these, but it seems like it
+ * would be nice to copy everything ...
+ */
+
+ else if (!S_ISREG (sb.st_mode)) {
+ err = copy_special (src, dst, reset_selinux, &sb, mt,
+ old_uid, new_uid, old_gid, new_gid);
+ }
+
+ /*
+ * Create the new file and copy the contents. The new
+ * file will be owned by the provided UID and GID values.
+ */
+
+ else {
+ err = copy_file (src, dst, reset_selinux, &sb, mt,
+ old_uid, new_uid, old_gid, new_gid);
+ }
+ }
+
+ return err;
+}
+
+/*
+ * copy_dir - copy a directory
+ *
+ * Copy a directory (recursively) from src to dst.
+ *
+ * statp, mt, old_uid, new_uid, old_gid, and new_gid are used to set
+ * the access and modification and the access rights.
+ *
+ * Return 0 on success, -1 on error.
+ */
+static int copy_dir (const char *src, const char *dst,
+ bool reset_selinux,
+ const struct stat *statp, const struct timeval mt[],
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid)
+{
+ int err = 0;
+
+ /*
+ * Create a new target directory, make it owned by
+ * the user and then recursively copy that directory.
+ */
+
+#ifdef WITH_SELINUX
+ if (set_selinux_file_context (dst) != 0) {
+ return -1;
+ }
+#endif /* WITH_SELINUX */
+ if ( (mkdir (dst, statp->st_mode) != 0)
+ || (chown_if_needed (dst, statp,
+ old_uid, new_uid, old_gid, new_gid) != 0)
+#ifdef WITH_ACL
+ || ( (perm_copy_file (src, dst, &ctx) != 0)
+ && (errno != 0))
+#else /* !WITH_ACL */
+ || (chmod (dst, statp->st_mode) != 0)
+#endif /* !WITH_ACL */
+#ifdef WITH_ATTR
+ /*
+ * If the third parameter is NULL, all extended attributes
+ * except those that define Access Control Lists are copied.
+ * ACLs are excluded by default because copying them between
+ * file systems with and without ACL support needs some
+ * additional logic so that no unexpected permissions result.
+ */
+ || ( !reset_selinux
+ && (attr_copy_file (src, dst, NULL, &ctx) != 0)
+ && (errno != 0))
+#endif /* WITH_ATTR */
+ || (copy_tree (src, dst, false, reset_selinux,
+ old_uid, new_uid, old_gid, new_gid) != 0)
+ || (utimes (dst, mt) != 0)) {
+ err = -1;
+ }
+
+ return err;
+}
+
+#ifdef S_IFLNK
+/*
+ * readlink_malloc - wrapper for readlink
+ *
+ * return NULL on error.
+ * The return string shall be freed by the caller.
+ */
+static /*@null@*/char *readlink_malloc (const char *filename)
+{
+ size_t size = 1024;
+
+ while (true) {
+ ssize_t nchars;
+ char *buffer = (char *) malloc (size);
+ if (NULL == buffer) {
+ return NULL;
+ }
+
+ nchars = readlink (filename, buffer, size);
+
+ if (nchars < 0) {
+ free(buffer);
+ return NULL;
+ }
+
+ if ((size_t) nchars < size) { /* The buffer was large enough */
+ /* readlink does not nul-terminate */
+ buffer[nchars] = '\0';
+ return buffer;
+ }
+
+ /* Try again with a bigger buffer */
+ free (buffer);
+ size *= 2;
+ }
+}
+
+/*
+ * copy_symlink - copy a symlink
+ *
+ * Copy a symlink from src to dst.
+ *
+ * statp, mt, old_uid, new_uid, old_gid, and new_gid are used to set
+ * the access and modification and the access rights.
+ *
+ * Return 0 on success, -1 on error.
+ */
+static int copy_symlink (const char *src, const char *dst,
+ unused bool reset_selinux,
+ const struct stat *statp, const struct timeval mt[],
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid)
+{
+ char *oldlink;
+
+ /* copy_tree () must be the entry point */
+ assert (NULL != src_orig);
+ assert (NULL != dst_orig);
+
+ /*
+ * Get the name of the file which the link points
+ * to. If that name begins with the original
+ * source directory name, that part of the link
+ * name will be replaced with the original
+ * destination directory name.
+ */
+
+ oldlink = readlink_malloc (src);
+ if (NULL == oldlink) {
+ return -1;
+ }
+
+ /* If src was a link to an entry of the src_orig directory itself,
+ * create a link to the corresponding entry in the dst_orig
+ * directory.
+ */
+ if (strncmp (oldlink, src_orig, strlen (src_orig)) == 0) {
+ size_t len = strlen (dst_orig) + strlen (oldlink) - strlen (src_orig) + 1;
+ char *dummy = (char *) xmalloc (len);
+ (void) snprintf (dummy, len, "%s%s",
+ dst_orig,
+ oldlink + strlen (src_orig));
+ free (oldlink);
+ oldlink = dummy;
+ }
+
+#ifdef WITH_SELINUX
+ if (set_selinux_file_context (dst) != 0) {
+ free (oldlink);
+ return -1;
+ }
+#endif /* WITH_SELINUX */
+ if ( (symlink (oldlink, dst) != 0)
+ || (lchown_if_needed (dst, statp,
+ old_uid, new_uid, old_gid, new_gid) != 0)) {
+ /* FIXME: there are no modes on symlinks, right?
+ * ACL could be copied, but this would be much more
+ * complex than calling perm_copy_file.
+ * Ditto for Extended Attributes.
+ * We currently only document that ACL and Extended
+ * Attributes are not copied.
+ */
+ free (oldlink);
+ return -1;
+ }
+ free (oldlink);
+
+#ifdef HAVE_LUTIMES
+ /* 2007-10-18: We don't care about
+ * exit status of lutimes because
+ * it returns ENOSYS on many system
+ * - not implemented
+ */
+ (void) lutimes (dst, mt);
+#endif /* HAVE_LUTIMES */
+
+ return 0;
+}
+#endif /* S_IFLNK */
+
+/*
+ * copy_hardlink - copy a hardlink
+ *
+ * Copy a hardlink from src to dst.
+ *
+ * Return 0 on success, -1 on error.
+ */
+static int copy_hardlink (const char *dst,
+ unused bool reset_selinux,
+ struct link_name *lp)
+{
+ /* FIXME: selinux, ACL, Extended Attributes needed? */
+
+ if (link (lp->ln_name, dst) != 0) {
+ return -1;
+ }
+
+ /* If the file could be unlinked, decrement the links counter,
+ * and forget about this link if it was the last reference */
+ lp->ln_count--;
+ if (lp->ln_count <= 0) {
+ remove_link (lp);
+ }
+
+ return 0;
+}
+
+/*
+ * copy_special - copy a special file
+ *
+ * Copy a special file from src to dst.
+ *
+ * statp, mt, old_uid, new_uid, old_gid, and new_gid are used to set
+ * the access and modification and the access rights.
+ *
+ * Return 0 on success, -1 on error.
+ */
+static int copy_special (const char *src, const char *dst,
+ bool reset_selinux,
+ const struct stat *statp, const struct timeval mt[],
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid)
+{
+ int err = 0;
+
+#ifdef WITH_SELINUX
+ if (set_selinux_file_context (dst) != 0) {
+ return -1;
+ }
+#endif /* WITH_SELINUX */
+
+ if ( (mknod (dst, statp->st_mode & ~07777, statp->st_rdev) != 0)
+ || (chown_if_needed (dst, statp,
+ old_uid, new_uid, old_gid, new_gid) != 0)
+#ifdef WITH_ACL
+ || ( (perm_copy_file (src, dst, &ctx) != 0)
+ && (errno != 0))
+#else /* !WITH_ACL */
+ || (chmod (dst, statp->st_mode & 07777) != 0)
+#endif /* !WITH_ACL */
+#ifdef WITH_ATTR
+ /*
+ * If the third parameter is NULL, all extended attributes
+ * except those that define Access Control Lists are copied.
+ * ACLs are excluded by default because copying them between
+ * file systems with and without ACL support needs some
+ * additional logic so that no unexpected permissions result.
+ */
+ || ( !reset_selinux
+ && (attr_copy_file (src, dst, NULL, &ctx) != 0)
+ && (errno != 0))
+#endif /* WITH_ATTR */
+ || (utimes (dst, mt) != 0)) {
+ err = -1;
+ }
+
+ return err;
+}
+
+/*
+ * copy_file - copy a file
+ *
+ * Copy a file from src to dst.
+ *
+ * statp, mt, old_uid, new_uid, old_gid, and new_gid are used to set
+ * the access and modification and the access rights.
+ *
+ * Return 0 on success, -1 on error.
+ */
+static int copy_file (const char *src, const char *dst,
+ bool reset_selinux,
+ const struct stat *statp, const struct timeval mt[],
+ uid_t old_uid, uid_t new_uid,
+ gid_t old_gid, gid_t new_gid)
+{
+ int err = 0;
+ int ifd;
+ int ofd;
+ char buf[1024];
+ ssize_t cnt;
+
+ ifd = open (src, O_RDONLY);
+ if (ifd < 0) {
+ return -1;
+ }
+#ifdef WITH_SELINUX
+ if (set_selinux_file_context (dst) != 0) {
+ return -1;
+ }
+#endif /* WITH_SELINUX */
+ ofd = open (dst, O_WRONLY | O_CREAT | O_TRUNC, statp->st_mode & 07777);
+ if ( (ofd < 0)
+ || (fchown_if_needed (ofd, statp,
+ old_uid, new_uid, old_gid, new_gid) != 0)
+#ifdef WITH_ACL
+ || ( (perm_copy_fd (src, ifd, dst, ofd, &ctx) != 0)
+ && (errno != 0))
+#else /* !WITH_ACL */
+ || (fchmod (ofd, statp->st_mode & 07777) != 0)
+#endif /* !WITH_ACL */
+#ifdef WITH_ATTR
+ /*
+ * If the third parameter is NULL, all extended attributes
+ * except those that define Access Control Lists are copied.
+ * ACLs are excluded by default because copying them between
+ * file systems with and without ACL support needs some
+ * additional logic so that no unexpected permissions result.
+ */
+ || ( !reset_selinux
+ && (attr_copy_fd (src, ifd, dst, ofd, NULL, &ctx) != 0)
+ && (errno != 0))
+#endif /* WITH_ATTR */
+ ) {
+ (void) close (ifd);
+ return -1;
+ }
+
+ while ((cnt = read (ifd, buf, sizeof buf)) > 0) {
+ if (write (ofd, buf, (size_t)cnt) != cnt) {
+ (void) close (ifd);
+ return -1;
+ }
+ }
+
+ (void) close (ifd);
+
+#ifdef HAVE_FUTIMES
+ if (futimes (ofd, mt) != 0) {
+ return -1;
+ }
+#endif /* HAVE_FUTIMES */
+
+ if (close (ofd) != 0) {
+ return -1;
+ }
+
+#ifndef HAVE_FUTIMES
+ if (utimes(dst, mt) != 0) {
+ return -1;
+ }
+#endif /* !HAVE_FUTIMES */
+
+ return err;
+}
+
+#define def_chown_if_needed(chown_function, type_dst) \
+static int chown_function ## _if_needed (type_dst dst, \
+ const struct stat *statp, \
+ uid_t old_uid, uid_t new_uid, \
+ gid_t old_gid, gid_t new_gid) \
+{ \
+ uid_t tmpuid = (uid_t) -1; \
+ gid_t tmpgid = (gid_t) -1; \
+ \
+ /* Use new_uid if old_uid is set to -1 or if the file was \
+ * owned by the user. */ \
+ if (((uid_t) -1 == old_uid) || (statp->st_uid == old_uid)) { \
+ tmpuid = new_uid; \
+ } \
+ /* Otherwise, or if new_uid was set to -1, we keep the same \
+ * owner. */ \
+ if ((uid_t) -1 == tmpuid) { \
+ tmpuid = statp->st_uid; \
+ } \
+ \
+ if (((gid_t) -1 == old_gid) || (statp->st_gid == old_gid)) { \
+ tmpgid = new_gid; \
+ } \
+ if ((gid_t) -1 == tmpgid) { \
+ tmpgid = statp->st_gid; \
+ } \
+ \
+ return chown_function (dst, tmpuid, tmpgid); \
+}
+
+def_chown_if_needed (chown, const char *)
+def_chown_if_needed (lchown, const char *)
+def_chown_if_needed (fchown, int)
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 08:57:30 +0000