forked from gokrazy/rsync
/
flist.go
218 lines (197 loc) · 4.26 KB
/
flist.go
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package receivermaincmd
import (
"fmt"
"io"
"io/fs"
"path/filepath"
"sort"
"time"
"github.com/superrxan/rsync"
"github.com/superrxan/rsync/internal/log"
)
// rsync/flist.c:flist_sort_and_clean
func sortFileList(fileList []*file) {
sort.Slice(fileList, func(i, j int) bool {
return fileList[i].Name < fileList[j].Name
})
}
type file struct {
Name string
Length int64
ModTime time.Time
Mode int32
Uid int32
Gid int32
LinkTarget string
Rdev int32
}
// FileMode converts from the Linux permission bits to Go’s permission bits.
func (f *file) FileMode() fs.FileMode {
ret := fs.FileMode(f.Mode) & fs.ModePerm
mode := f.Mode & rsync.S_IFMT
switch mode {
case rsync.S_IFCHR:
ret |= fs.ModeCharDevice
case rsync.S_IFBLK:
ret |= fs.ModeDevice
case rsync.S_IFIFO:
ret |= fs.ModeNamedPipe
case rsync.S_IFSOCK:
ret |= fs.ModeSocket
case rsync.S_IFLNK:
ret |= fs.ModeSymlink
case rsync.S_IFDIR:
ret |= fs.ModeDir
}
return ret
}
// rsync/flist.c:receive_file_entry
func (rt *recvTransfer) receiveFileEntry(flags uint16, last *file) (*file, error) {
f := &file{}
var l1 int
if flags&rsync.XMIT_SAME_NAME != 0 {
l, err := rt.conn.ReadByte()
if err != nil {
return nil, err
}
l1 = int(l)
}
var l2 int
if flags&rsync.XMIT_LONG_NAME != 0 {
l, err := rt.conn.ReadInt32()
if err != nil {
return nil, err
}
l2 = int(l)
} else {
l, err := rt.conn.ReadByte()
if err != nil {
return nil, err
}
l2 = int(l)
}
// linux/limits.h
const PATH_MAX = 4096
if l2 >= PATH_MAX-l1 {
const lastname = ""
return nil, fmt.Errorf("overflow: flags=0x%x l1=%d l2=%d lastname=%s",
flags, l1, l2, lastname)
}
b := make([]byte, l1+l2)
readb := b
if l1 > 0 {
copy(b, []byte(last.Name))
readb = b[l1:]
}
if _, err := io.ReadFull(rt.conn.Reader, readb); err != nil {
return nil, err
}
// TODO: does rsync’s clean_fname() and sanitize_path() combination do
// anything more than Go’s filepath.Clean()?
f.Name = filepath.Clean(string(b))
length, err := rt.conn.ReadInt64()
if err != nil {
return nil, err
}
f.Length = length
if flags&rsync.XMIT_SAME_TIME != 0 {
f.ModTime = last.ModTime
} else {
modTime, err := rt.conn.ReadInt32()
if err != nil {
return nil, err
}
f.ModTime = time.Unix(int64(modTime), 0)
}
if flags&rsync.XMIT_SAME_MODE != 0 {
f.Mode = last.Mode
} else {
mode, err := rt.conn.ReadInt32()
if err != nil {
return nil, err
}
f.Mode = mode
}
if rt.opts.PreserveUid {
if flags&rsync.XMIT_SAME_UID != 0 {
f.Uid = last.Uid
} else {
uid, err := rt.conn.ReadInt32()
if err != nil {
return nil, err
}
f.Uid = uid
}
}
if rt.opts.PreserveGid {
if flags&rsync.XMIT_SAME_GID != 0 {
f.Gid = last.Gid
} else {
gid, err := rt.conn.ReadInt32()
if err != nil {
return nil, err
}
f.Gid = gid
}
}
mode := f.Mode & rsync.S_IFMT
isDev := mode == rsync.S_IFCHR || mode == rsync.S_IFBLK
isSpecial := mode == rsync.S_IFIFO || mode == rsync.S_IFSOCK
isLink := mode == rsync.S_IFLNK
if rt.opts.PreserveDevices && (isDev || isSpecial) {
// TODO(protocol >= 28): rdev/major/minor handling
if flags&rsync.XMIT_SAME_RDEV_pre28 != 0 {
f.Rdev = last.Rdev
} else {
rdev, err := rt.conn.ReadInt32()
if err != nil {
return nil, err
}
f.Rdev = rdev
}
}
if rt.opts.PreserveLinks && isLink {
length, err := rt.conn.ReadInt32()
if err != nil {
return nil, err
}
b := make([]byte, length)
if _, err := io.ReadFull(rt.conn.Reader, b); err != nil {
return nil, err
}
f.LinkTarget = string(b)
}
return f, nil
}
// rsync/flist.c:recv_file_list
func (rt *recvTransfer) receiveFileList() ([]*file, error) {
var lastFileEntry *file
var fileList []*file
for {
b, err := rt.conn.ReadByte()
if err != nil {
return nil, err
}
if b == 0 {
break
}
flags := uint16(b)
// log.Printf("flags: %x", flags)
// TODO(protocol >= 28): extended flags
f, err := rt.receiveFileEntry(flags, lastFileEntry)
if err != nil {
return nil, err
}
lastFileEntry = f
// TODO: include depth in output?
log.Printf("[Receiver] i=%d ? %s mode=%o len=%d uid=%d gid=%d flags=?",
len(fileList),
f.Name,
f.Mode,
f.Length,
f.Uid,
f.Gid)
fileList = append(fileList, f)
}
return fileList, nil
}