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90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
package main
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import (
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"C"
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"syscall"
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"golang.org/x/sys/unix"
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"libgocryptfs/v2/internal/nametransform"
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"libgocryptfs/v2/internal/syscallcompat"
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)
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//export gcf_get_attrs
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func gcf_get_attrs(sessionID int, relPath string) (uint64, int64, bool) {
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volume := OpenedVolumes[sessionID]
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dirfd, cName, err := volume.prepareAtSyscall(relPath)
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if err != nil {
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return 0, 0, false
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}
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defer syscall.Close(dirfd)
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st, err := syscallcompat.Fstatat2(dirfd, cName, unix.AT_SYMLINK_NOFOLLOW)
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if err != nil {
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return 0, 0, false
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}
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// Translate ciphertext size to plaintext size
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size := volume.translateSize(dirfd, cName, st)
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return size, int64(st.Mtim.Sec), true
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}
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// libgocryptfs: using Renameat instead of Renameat2 to support older kernels
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//export gcf_rename
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func gcf_rename(sessionID int, oldPath string, newPath string) bool {
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volume := OpenedVolumes[sessionID]
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dirfd, cName, err := volume.prepareAtSyscall(oldPath)
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if err != nil {
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return false
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}
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defer syscall.Close(dirfd)
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dirfd2, cName2, err := volume.prepareAtSyscall(newPath)
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if err != nil {
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return false
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}
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defer syscall.Close(dirfd2)
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// Easy case.
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if volume.plainTextNames {
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return errToBool(syscallcompat.Renameat(dirfd, cName, dirfd2, cName2))
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}
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// Long destination file name: create .name file
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nameFileAlreadyThere := false
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if nametransform.IsLongContent(cName2) {
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err = volume.nameTransform.WriteLongNameAt(dirfd2, cName2, newPath)
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// Failure to write the .name file is expected when the target path already
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// exists. Since hashes are pretty unique, there is no need to modify the
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// .name file in this case, and we ignore the error.
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if err == syscall.EEXIST {
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nameFileAlreadyThere = true
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} else if err != nil {
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return false
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}
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}
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// Actual rename
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err = syscallcompat.Renameat(dirfd, cName, dirfd2, cName2)
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if err == syscall.ENOTEMPTY || err == syscall.EEXIST {
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// If an empty directory is overwritten we will always get an error as
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// the "empty" directory will still contain gocryptfs.diriv.
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// Interestingly, ext4 returns ENOTEMPTY while xfs returns EEXIST.
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// We handle that by trying to fs.Rmdir() the target directory and trying
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// again.
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if gcf_rmdir(sessionID, newPath) {
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err = syscallcompat.Renameat(dirfd, cName, dirfd2, cName2)
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}
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}
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if err != nil {
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if nametransform.IsLongContent(cName2) && !nameFileAlreadyThere {
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// Roll back .name creation unless the .name file was already there
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nametransform.DeleteLongNameAt(dirfd2, cName2)
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}
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return false
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}
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if nametransform.IsLongContent(cName) {
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nametransform.DeleteLongNameAt(dirfd, cName)
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}
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return true
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}
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