Ejemplo n.º 1
0
func lookupUnixUid(uid int) (*User, error) {
	var pwd syscall.Passwd
	var result *syscall.Passwd

	buf := alloc(userBuffer)
	defer buf.free()

	err := retryWithBuffer(buf, func() syscall.Errno {
		syscall.Entersyscall()
		rv := libc_getpwuid_r(syscall.Uid_t(uid),
			&pwd,
			buf.ptr,
			buf.size,
			&result)
		syscall.Exitsyscall()
		if rv != 0 {
			return syscall.GetErrno()
		}
		return 0
	})
	if err != nil {
		return nil, fmt.Errorf("user: lookup userid %d: %v", uid, err)
	}
	if result == nil {
		return nil, UnknownUserIdError(uid)
	}
	return buildUser(&pwd), nil
}
Ejemplo n.º 2
0
func lookupUnix(uid int, username string, lookupByName bool) (*User, error) {
	var pwd syscall.Passwd
	var result *syscall.Passwd

	// FIXME: Should let buf grow if necessary.
	const bufSize = 1024
	buf := make([]byte, bufSize)
	if lookupByName {
		nameC := syscall.StringBytePtr(username)
		syscall.Entersyscall()
		rv := libc_getpwnam_r(nameC,
			&pwd,
			&buf[0],
			bufSize,
			&result)
		syscall.Exitsyscall()
		if rv != 0 {
			return nil, fmt.Errorf("user: lookup username %s: %s", username, syscall.GetErrno())
		}
		if result == nil {
			return nil, UnknownUserError(username)
		}
	} else {
		syscall.Entersyscall()
		rv := libc_getpwuid_r(syscall.Uid_t(uid),
			&pwd,
			&buf[0],
			bufSize,
			&result)
		syscall.Exitsyscall()
		if rv != 0 {
			return nil, fmt.Errorf("user: lookup userid %d: %s", uid, syscall.GetErrno())
		}
		if result == nil {
			return nil, UnknownUserIdError(uid)
		}
	}
	u := &User{
		Uid:      strconv.Itoa(int(pwd.Pw_uid)),
		Gid:      strconv.Itoa(int(pwd.Pw_gid)),
		Username: bytePtrToString((*byte)(unsafe.Pointer(pwd.Pw_name))),
		Name:     bytePtrToString((*byte)(unsafe.Pointer(pwd.Pw_gecos))),
		HomeDir:  bytePtrToString((*byte)(unsafe.Pointer(pwd.Pw_dir))),
	}
	// The pw_gecos field isn't quite standardized.  Some docs
	// say: "It is expected to be a comma separated list of
	// personal data where the first item is the full name of the
	// user."
	if i := strings.Index(u.Name, ","); i >= 0 {
		u.Name = u.Name[:i]
	}
	return u, nil
}