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package file
import (
"bufio"
"bytes"
"fmt"
"os"
"strconv"
"strings"
"ior/internal/types"
)
// File is the common interface for file-like syscall payload representations.
type File interface {
String() string
Name() string
Flags() Flags
FD() int32
}
// FdFile represents a file descriptor-backed file reference.
type FdFile struct {
fd int32
name string
flags Flags
flagsFromProcFS bool
}
// NewFd constructs an FdFile from explicit descriptor metadata.
func NewFd(fd int32, name string, flags int32) *FdFile {
f := &FdFile{
fd: fd,
name: name,
flags: Flags(flags),
}
if f.flags == -1 {
f.flags = unknownFlag
}
return f
}
// NewFdWithPid resolves descriptor metadata from /proc/<pid>/fd.
func NewFdWithPid(fd int32, pid uint32) *FdFile {
f := &FdFile{
fd: fd,
}
var err error
procPath := fmt.Sprintf("/proc/%d/fd/%d", pid, fd)
f.name, err = os.Readlink(procPath)
if err != nil {
f.name = ""
f.flags = unknownFlag
f.flagsFromProcFS = true
return f
}
f.flags, _ = readFlagsFromFdInfo(fd, pid)
f.flagsFromProcFS = true
return f
}
func (f *FdFile) Dup(fd int32) *FdFile {
dupFd := *f
dupFd.fd = fd
return &dupFd
}
func readFlagsFromFdInfo(fd int32, pid uint32) (Flags, error) {
data, err := os.ReadFile(fmt.Sprintf("/proc/%d/fdinfo/%d", pid, fd))
if err != nil {
return unknownFlag, err
}
scanner := bufio.NewScanner(bytes.NewReader(data))
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "flags:") {
flagsStr := strings.Fields(line)[1]
flags, err := strconv.ParseUint(flagsStr, 8, 32)
return Flags(flags), err
}
}
return unknownFlag, scanner.Err()
}
func (f *FdFile) Name() string {
return f.name
}
func (f *FdFile) String() string {
var sb strings.Builder
if len(f.name) == 0 {
sb.WriteString("E:name") // Emtpy name string
} else {
sb.WriteString(f.name)
}
sb.WriteString("%(")
sb.WriteString(strconv.FormatInt(int64(f.fd), 10))
sb.WriteString(",")
sb.WriteString(f.Flags().String())
sb.WriteString(")")
return sb.String()
}
func (f *FdFile) Flags() Flags {
return f.flags
}
func (f *FdFile) FD() int32 {
return f.fd
}
func (f *FdFile) SetFlags(flags int32) {
f.flags = Flags(flags)
}
func (f *FdFile) AddFlags(flags int32) {
f.flags = Flags(int32(f.flags) | flags)
}
type oldnameNewnameFile struct {
Oldname, Newname string
}
// NewOldnameNewname creates a file representation for rename-like syscalls.
func NewOldnameNewname(oldname, newname []byte) oldnameNewnameFile {
return oldnameNewnameFile{types.StringValue(oldname), types.StringValue(newname)}
}
func (f oldnameNewnameFile) Name() string {
return f.Newname
}
func (f oldnameNewnameFile) Flags() Flags {
return unknownFlag
}
func (f oldnameNewnameFile) FD() int32 {
return -1
}
func (f oldnameNewnameFile) String() string {
var sb strings.Builder
sb.WriteString("old:")
sb.WriteString(f.Oldname)
sb.WriteString(" ->new:")
sb.WriteString(f.Newname)
sb.WriteString("%(")
sb.WriteString(f.Flags().String())
sb.WriteString(")")
return sb.String()
}
type pathnameFile struct {
Pathname string
}
// NewPathname creates a path-only file representation.
func NewPathname(pathname []byte) pathnameFile {
return pathnameFile{types.StringValue(pathname)}
}
func (f pathnameFile) Name() string {
return f.Pathname
}
func (f pathnameFile) Flags() Flags {
return unknownFlag
}
func (f pathnameFile) FD() int32 {
return -1
}
func (f pathnameFile) String() string {
var sb strings.Builder
sb.WriteString("pathname:")
sb.WriteString(f.Pathname)
sb.WriteString("%(")
sb.WriteString(f.Flags().String())
sb.WriteString(")")
return sb.String()
}
|
