Beispiel #1
0
func lookupUnix(gid int, groupname string, lookupByName bool) (*Group, error) {
	var grp C.struct_group
	var result *C.struct_group

	var bufSize C.long
	if runtime.GOOS == "freebsd" {
		panic("Don't know how to deal with freebsd.")
	} else {
		bufSize = C.sysconf(C._SC_GETGR_R_SIZE_MAX) * 20
		if bufSize <= 0 || bufSize > 1<<20 {
			return nil, fmt.Errorf("group: unreasonable _SC_GETGR_R_SIZE_MAX of %d", bufSize)
		}
	}
	buf := C.malloc(C.size_t(bufSize))
	defer C.free(buf)
	var rv C.int
	if lookupByName {
		nameC := C.CString(groupname)
		defer C.free(unsafe.Pointer(nameC))
		rv = C.mygetgrnam_r(nameC,
			&grp,
			(*C.char)(buf),
			C.size_t(bufSize),
			&result)
		if rv != 0 {
			return nil, fmt.Errorf("group: lookup groupname %s: %s", groupname, syscall.Errno(rv))
		}
		if result == nil {
			return nil, UnknownGroupError(groupname)
		}
	} else {
		rv = C.mygetgrgid_r(C.int(gid),
			&grp,
			(*C.char)(buf),
			C.size_t(bufSize),
			&result)
		if rv != 0 {
			return nil, fmt.Errorf("group: lookup groupid %d: %s", gid, syscall.Errno(rv))
		}
		if result == nil {
			return nil, UnknownGroupIdError(gid)
		}
	}
	u := &Group{
		Gid:       strconv.Itoa(int(grp.gr_gid)),
		Groupname: C.GoString(grp.gr_name),
	}
	return u, nil
}
Beispiel #2
0
func getGroupId(group string) (int, error) {
	var rv C.int
	var grp C.struct_group
	var grpres *C.struct_group
	var bufSize C.long
	var result int

	bufSize = 1024
	buf := C.malloc(C.size_t(bufSize))
	defer C.free(buf)

	rv = C.mygetgrnam_r(C.CString(group), &grp, (*C.char)(buf), C.size_t(bufSize), &grpres)
	if rv != 0 {
		return -1, errors.New("Could not read groupid")
	}

	if grpres != nil {
		result = int(C.int(grp.gr_gid))
	} else {
		return -1, errors.New("Could not convert groupid")
	}
	return result, nil
}
Beispiel #3
0
func lookupGroup(groupname string) (*Group, error) {
	var grp C.struct_group
	var result *C.struct_group

	buf := alloc(groupBuffer)
	defer buf.free()
	cname := C.CString(groupname)
	defer C.free(unsafe.Pointer(cname))

	err := retryWithBuffer(buf, func() syscall.Errno {
		return syscall.Errno(C.mygetgrnam_r(cname,
			&grp,
			(*C.char)(buf.ptr),
			C.size_t(buf.size),
			&result))
	})
	if err != nil {
		return nil, fmt.Errorf("user: lookup groupname %s: %v", groupname, err)
	}
	if result == nil {
		return nil, UnknownGroupError(groupname)
	}
	return buildGroup(&grp), nil
}