116 lines
3.1 KiB
Go
116 lines
3.1 KiB
Go
package fusefrontend
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import (
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"context"
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"path/filepath"
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"syscall"
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"golang.org/x/sys/unix"
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"github.com/hanwen/go-fuse/v2/fs"
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"github.com/hanwen/go-fuse/v2/fuse"
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"github.com/rfjakob/gocryptfs/internal/contentenc"
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"github.com/rfjakob/gocryptfs/internal/inomap"
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"github.com/rfjakob/gocryptfs/internal/nametransform"
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"github.com/rfjakob/gocryptfs/internal/syscallcompat"
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)
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// Node is a file or directory in the filesystem tree
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// in a gocryptfs mount.
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type Node struct {
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fs.Inode
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}
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// RootNode is the root of the filesystem tree of Nodes.
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type RootNode struct {
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Node
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// args stores configuration arguments
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args Args
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// Filename encryption helper
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nameTransform nametransform.NameTransformer
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// Content encryption helper
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contentEnc *contentenc.ContentEnc
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// MitigatedCorruptions is used to report data corruption that is internally
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// mitigated by ignoring the corrupt item. For example, when OpenDir() finds
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// a corrupt filename, we still return the other valid filenames.
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// The corruption is logged to syslog to inform the user, and in addition,
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// the corrupt filename is logged to this channel via
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// reportMitigatedCorruption().
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// "gocryptfs -fsck" reads from the channel to also catch these transparently-
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// mitigated corruptions.
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MitigatedCorruptions chan string
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// IsIdle flag is set to zero each time fs.isFiltered() is called
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// (uint32 so that it can be reset with CompareAndSwapUint32).
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// When -idle was used when mounting, idleMonitor() sets it to 1
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// periodically.
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IsIdle uint32
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// inoMap translates inode numbers from different devices to unique inode
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// numbers.
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inoMap *inomap.InoMap
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}
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func NewRootNode(args Args, c *contentenc.ContentEnc, n nametransform.NameTransformer) *RootNode {
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// TODO
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return &RootNode{
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args: args,
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nameTransform: n,
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contentEnc: c,
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inoMap: inomap.New(),
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}
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}
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// path returns the relative plaintext path of this node
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func (n *Node) path() string {
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return n.Path(n.Root())
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}
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func (n *Node) rootNode() *RootNode {
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return n.Root().Operations().(*RootNode)
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}
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func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
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rn := n.rootNode()
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p := filepath.Join(n.path(), name)
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dirfd, cName, err := rn.openBackingDir(p)
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if err != nil {
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return nil, fs.ToErrno(err)
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}
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defer syscall.Close(dirfd)
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// Get device number and inode number into `st`
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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 nil, fs.ToErrno(err)
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}
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// Get unique inode number
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rn.inoMap.TranslateStat(st)
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out.Attr.FromStat(st)
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// Create child node
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id := fs.StableAttr{
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Mode: uint32(st.Mode),
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Gen: 1,
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Ino: st.Ino,
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}
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node := &Node{}
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ch := n.NewInode(ctx, node, id)
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return ch, 0
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}
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func (n *Node) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
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rn := n.rootNode()
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dirfd, cName, err := rn.openBackingDir(n.path())
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if err != nil {
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return fs.ToErrno(err)
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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 fs.ToErrno(err)
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}
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rn.inoMap.TranslateStat(st)
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out.Attr.FromStat(st)
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return 0
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}
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