From fcb28e4ff35e6bc262bfda23f3779ef3a8e7708a Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Thu, 15 Oct 2020 23:18:21 +0200
Subject: v2pai: delete fusefrontend_reverse_v1api

Served its mission a copy-paste source but can now be deleted.
---
 .../reverse_longnames.go                           | 126 ---------------------
 1 file changed, 126 deletions(-)
 delete mode 100644 internal/fusefrontend_reverse_v1api/reverse_longnames.go

(limited to 'internal/fusefrontend_reverse_v1api/reverse_longnames.go')

diff --git a/internal/fusefrontend_reverse_v1api/reverse_longnames.go b/internal/fusefrontend_reverse_v1api/reverse_longnames.go
deleted file mode 100644
index f1576d2..0000000
--- a/internal/fusefrontend_reverse_v1api/reverse_longnames.go
+++ /dev/null
@@ -1,126 +0,0 @@
-package fusefrontend_reverse
-
-import (
-	"log"
-	"path/filepath"
-	"sync"
-	"syscall"
-	"time"
-
-	"golang.org/x/sys/unix"
-
-	"github.com/hanwen/go-fuse/v2/fuse"
-	"github.com/hanwen/go-fuse/v2/fuse/nodefs"
-
-	"github.com/rfjakob/gocryptfs/internal/nametransform"
-	"github.com/rfjakob/gocryptfs/internal/pathiv"
-	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
-	"github.com/rfjakob/gocryptfs/internal/tlog"
-)
-
-const (
-	// File names are padded to 16-byte multiples, encrypted and
-	// base64-encoded. We can encode at most 176 bytes to stay below the 255
-	// bytes limit:
-	// * base64(176 bytes) = 235 bytes
-	// * base64(192 bytes) = 256 bytes (over 255!)
-	// But the PKCS#7 padding is at least one byte. This means we can only use
-	// 175 bytes for the file name.
-	shortNameMax = 175
-)
-
-// longnameParentCache maps dir+"/"+longname to plaintextname.
-// Yes, the combination of relative plaintext dir path and encrypted
-// longname is strange, but works fine as a map index.
-var longnameParentCache map[string]string
-var longnameCacheLock sync.Mutex
-
-// Very simple cache cleaner: Nuke it every hour
-func longnameCacheCleaner() {
-	for {
-		time.Sleep(time.Hour)
-		longnameCacheLock.Lock()
-		longnameParentCache = map[string]string{}
-		longnameCacheLock.Unlock()
-	}
-}
-
-func initLongnameCache() {
-	if longnameParentCache != nil {
-		return
-	}
-	longnameParentCache = map[string]string{}
-	go longnameCacheCleaner()
-}
-
-// findLongnameParent converts "longname" = "gocryptfs.longname.XYZ" to the
-// plaintext name. "dir" = relative plaintext path to the directory the
-// longname file is in, "dirIV" = directory IV of the directory.
-func (rfs *ReverseFS) findLongnameParent(dir string, dirIV []byte, longname string) (plaintextName string, err error) {
-	longnameCacheLock.Lock()
-	hit := longnameParentCache[dir+"/"+longname]
-	longnameCacheLock.Unlock()
-	if hit != "" {
-		return hit, nil
-	}
-	dirfd, err := syscallcompat.OpenDirNofollow(rfs.args.Cipherdir, filepath.Dir(dir))
-	if err != nil {
-		tlog.Warn.Printf("findLongnameParent: OpenDirNofollow failed: %v\n", err)
-		return "", err
-	}
-	fd, err := syscallcompat.Openat(dirfd, filepath.Base(dir), syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
-	syscall.Close(dirfd)
-	if err != nil {
-		tlog.Warn.Printf("findLongnameParent: Openat failed: %v\n", err)
-		return "", err
-	}
-	dirEntries, err := syscallcompat.Getdents(fd)
-	syscall.Close(fd)
-	if err != nil {
-		tlog.Warn.Printf("findLongnameParent: Getdents failed: %v\n", err)
-		return "", err
-	}
-	longnameCacheLock.Lock()
-	defer longnameCacheLock.Unlock()
-	for _, entry := range dirEntries {
-		plaintextName := entry.Name
-		if len(plaintextName) <= shortNameMax {
-			continue
-		}
-		cName := rfs.nameTransform.EncryptName(plaintextName, dirIV)
-		if len(cName) <= unix.NAME_MAX {
-			// Entry should have been skipped by the "continue" above
-			log.Panic("logic error or wrong shortNameMax constant?")
-		}
-		hName := rfs.nameTransform.HashLongName(cName)
-		longnameParentCache[dir+"/"+hName] = plaintextName
-		if longname == hName {
-			hit = plaintextName
-		}
-	}
-	if hit == "" {
-		return "", syscall.ENOENT
-	}
-	return hit, nil
-}
-
-func (rfs *ReverseFS) newNameFile(relPath string) (nodefs.File, fuse.Status) {
-	dotName := filepath.Base(relPath)                       // gocryptfs.longname.XYZ.name
-	longname := nametransform.RemoveLongNameSuffix(dotName) // gocryptfs.longname.XYZ
-	// cipher directory
-	cDir := nametransform.Dir(relPath)
-	// plain directory
-	pDir, err := rfs.decryptPath(cDir)
-	if err != nil {
-		return nil, fuse.ToStatus(err)
-	}
-	dirIV := pathiv.Derive(cDir, pathiv.PurposeDirIV)
-	// plain name
-	pName, err := rfs.findLongnameParent(pDir, dirIV, longname)
-	if err != nil {
-		return nil, fuse.ToStatus(err)
-	}
-	content := []byte(rfs.nameTransform.EncryptName(pName, dirIV))
-	parentFile := filepath.Join(pDir, pName)
-	return rfs.newVirtualFile(content, rfs.args.Cipherdir, parentFile, inoTagNameFile)
-}
-- 
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