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// Copyright 2019 Wataru Ishida. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sctp
import (
"bytes"
"encoding/binary"
"fmt"
"net"
"strconv"
"strings"
"sync"
"sync/atomic"
"syscall"
"time"
"unsafe"
)
const (
SOL_SCTP = 132
SCTP_BINDX_ADD_ADDR = 0x01
SCTP_BINDX_REM_ADDR = 0x02
MSG_NOTIFICATION = 0x8000
)
const (
SCTP_RTOINFO = iota
SCTP_ASSOCINFO
SCTP_INITMSG
SCTP_NODELAY
SCTP_AUTOCLOSE
SCTP_SET_PEER_PRIMARY_ADDR
SCTP_PRIMARY_ADDR
SCTP_ADAPTATION_LAYER
SCTP_DISABLE_FRAGMENTS
SCTP_PEER_ADDR_PARAMS
SCTP_DEFAULT_SENT_PARAM
SCTP_EVENTS
SCTP_I_WANT_MAPPED_V4_ADDR
SCTP_MAXSEG
SCTP_STATUS
SCTP_GET_PEER_ADDR_INFO
SCTP_DELAYED_ACK_TIME
SCTP_DELAYED_ACK = SCTP_DELAYED_ACK_TIME
SCTP_DELAYED_SACK = SCTP_DELAYED_ACK_TIME
SCTP_SOCKOPT_BINDX_ADD = 100
SCTP_SOCKOPT_BINDX_REM = 101
SCTP_SOCKOPT_PEELOFF = 102
SCTP_GET_PEER_ADDRS = 108
SCTP_GET_LOCAL_ADDRS = 109
SCTP_SOCKOPT_CONNECTX = 110
SCTP_SOCKOPT_CONNECTX3 = 111
)
const (
SCTP_EVENT_DATA_IO = 1 << iota
SCTP_EVENT_ASSOCIATION
SCTP_EVENT_ADDRESS
SCTP_EVENT_SEND_FAILURE
SCTP_EVENT_PEER_ERROR
SCTP_EVENT_SHUTDOWN
SCTP_EVENT_PARTIAL_DELIVERY
SCTP_EVENT_ADAPTATION_LAYER
SCTP_EVENT_AUTHENTICATION
SCTP_EVENT_SENDER_DRY
SCTP_EVENT_ALL = SCTP_EVENT_DATA_IO | SCTP_EVENT_ASSOCIATION | SCTP_EVENT_ADDRESS | SCTP_EVENT_SEND_FAILURE | SCTP_EVENT_PEER_ERROR | SCTP_EVENT_SHUTDOWN | SCTP_EVENT_PARTIAL_DELIVERY | SCTP_EVENT_ADAPTATION_LAYER | SCTP_EVENT_AUTHENTICATION | SCTP_EVENT_SENDER_DRY
)
type SCTPNotificationType int
const (
SCTP_SN_TYPE_BASE = SCTPNotificationType(iota + (1 << 15))
SCTP_ASSOC_CHANGE
SCTP_PEER_ADDR_CHANGE
SCTP_SEND_FAILED
SCTP_REMOTE_ERROR
SCTP_SHUTDOWN_EVENT
SCTP_PARTIAL_DELIVERY_EVENT
SCTP_ADAPTATION_INDICATION
SCTP_AUTHENTICATION_INDICATION
SCTP_SENDER_DRY_EVENT
)
type NotificationHandler func([]byte) error
type EventSubscribe struct {
DataIO uint8
Association uint8
Address uint8
SendFailure uint8
PeerError uint8
Shutdown uint8
PartialDelivery uint8
AdaptationLayer uint8
Authentication uint8
SenderDry uint8
}
const (
SCTP_CMSG_INIT = iota
SCTP_CMSG_SNDRCV
SCTP_CMSG_SNDINFO
SCTP_CMSG_RCVINFO
SCTP_CMSG_NXTINFO
)
const (
SCTP_UNORDERED = 1 << iota
SCTP_ADDR_OVER
SCTP_ABORT
SCTP_SACK_IMMEDIATELY
SCTP_EOF
)
const (
SCTP_MAX_STREAM = 0xffff
)
type InitMsg struct {
NumOstreams uint16
MaxInstreams uint16
MaxAttempts uint16
MaxInitTimeout uint16
}
type SndRcvInfo struct {
Stream uint16
SSN uint16
Flags uint16
_ uint16
PPID uint32
Context uint32
TTL uint32
TSN uint32
CumTSN uint32
AssocID int32
}
type SndInfo struct {
SID uint16
Flags uint16
PPID uint32
Context uint32
AssocID int32
}
type GetAddrsOld struct {
AssocID int32
AddrNum int32
Addrs uintptr
}
type NotificationHeader struct {
Type uint16
Flags uint16
Length uint32
}
type SCTPState uint16
const (
SCTP_COMM_UP = SCTPState(iota)
SCTP_COMM_LOST
SCTP_RESTART
SCTP_SHUTDOWN_COMP
SCTP_CANT_STR_ASSOC
)
var nativeEndian binary.ByteOrder
var sndRcvInfoSize uintptr
func init() {
i := uint16(1)
if *(*byte)(unsafe.Pointer(&i)) == 0 {
nativeEndian = binary.BigEndian
} else {
nativeEndian = binary.LittleEndian
}
info := SndRcvInfo{}
sndRcvInfoSize = unsafe.Sizeof(info)
}
func toBuf(v interface{}) []byte {
var buf bytes.Buffer
binary.Write(&buf, nativeEndian, v)
return buf.Bytes()
}
func htons(h uint16) uint16 {
if nativeEndian == binary.LittleEndian {
return (h << 8 & 0xff00) | (h >> 8 & 0xff)
}
return h
}
var ntohs = htons
// setInitOpts sets options for an SCTP association initialization
// see https://tools.ietf.org/html/rfc4960#page-25
func setInitOpts(fd int, options InitMsg) error {
optlen := unsafe.Sizeof(options)
_, _, err := setsockopt(fd, SCTP_INITMSG, uintptr(unsafe.Pointer(&options)), uintptr(optlen))
return err
}
func setNumOstreams(fd, num int) error {
return setInitOpts(fd, InitMsg{NumOstreams: uint16(num)})
}
type SCTPAddr struct {
IPAddrs []net.IPAddr
Port int
}
func (a *SCTPAddr) ToRawSockAddrBuf() []byte {
p := htons(uint16(a.Port))
if len(a.IPAddrs) == 0 { // if a.IPAddrs list is empty - fall back to IPv4 zero addr
s := syscall.RawSockaddrInet4{
Family: syscall.AF_INET,
Port: p,
}
copy(s.Addr[:], net.IPv4zero)
return toBuf(s)
}
buf := []byte{}
for _, ip := range a.IPAddrs {
ipBytes := ip.IP
if len(ipBytes) == 0 {
ipBytes = net.IPv4zero
}
if ip4 := ipBytes.To4(); ip4 != nil {
s := syscall.RawSockaddrInet4{
Family: syscall.AF_INET,
Port: p,
}
copy(s.Addr[:], ip4)
buf = append(buf, toBuf(s)...)
} else {
var scopeid uint32
ifi, err := net.InterfaceByName(ip.Zone)
if err == nil {
scopeid = uint32(ifi.Index)
}
s := syscall.RawSockaddrInet6{
Family: syscall.AF_INET6,
Port: p,
Scope_id: scopeid,
}
copy(s.Addr[:], ipBytes)
buf = append(buf, toBuf(s)...)
}
}
return buf
}
func (a *SCTPAddr) String() string {
var b bytes.Buffer
for n, i := range a.IPAddrs {
if i.IP.To4() != nil {
b.WriteString(i.String())
} else if i.IP.To16() != nil {
b.WriteRune('[')
b.WriteString(i.String())
b.WriteRune(']')
}
if n < len(a.IPAddrs)-1 {
b.WriteRune('/')
}
}
b.WriteRune(':')
b.WriteString(strconv.Itoa(a.Port))
return b.String()
}
func (a *SCTPAddr) Network() string { return "sctp" }
func ResolveSCTPAddr(network, addrs string) (*SCTPAddr, error) {
tcpnet := ""
switch network {
case "", "sctp":
tcpnet = "tcp"
case "sctp4":
tcpnet = "tcp4"
case "sctp6":
tcpnet = "tcp6"
default:
return nil, fmt.Errorf("invalid net: %s", network)
}
elems := strings.Split(addrs, "/")
if len(elems) == 0 {
return nil, fmt.Errorf("invalid input: %s", addrs)
}
ipaddrs := make([]net.IPAddr, 0, len(elems))
for _, e := range elems[:len(elems)-1] {
tcpa, err := net.ResolveTCPAddr(tcpnet, e+":")
if err != nil {
return nil, err
}
ipaddrs = append(ipaddrs, net.IPAddr{IP: tcpa.IP, Zone: tcpa.Zone})
}
tcpa, err := net.ResolveTCPAddr(tcpnet, elems[len(elems)-1])
if err != nil {
return nil, err
}
if tcpa.IP != nil {
ipaddrs = append(ipaddrs, net.IPAddr{IP: tcpa.IP, Zone: tcpa.Zone})
} else {
ipaddrs = nil
}
return &SCTPAddr{
IPAddrs: ipaddrs,
Port: tcpa.Port,
}, nil
}
func SCTPConnect(fd int, addr *SCTPAddr) (int, error) {
buf := addr.ToRawSockAddrBuf()
param := GetAddrsOld{
AddrNum: int32(len(buf)),
Addrs: uintptr(uintptr(unsafe.Pointer(&buf[0]))),
}
optlen := unsafe.Sizeof(param)
_, _, err := getsockopt(fd, SCTP_SOCKOPT_CONNECTX3, uintptr(unsafe.Pointer(¶m)), uintptr(unsafe.Pointer(&optlen)))
if err == nil {
return int(param.AssocID), nil
} else if err != syscall.ENOPROTOOPT {
return 0, err
}
r0, _, err := setsockopt(fd, SCTP_SOCKOPT_CONNECTX, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)))
return int(r0), err
}
func SCTPBind(fd int, addr *SCTPAddr, flags int) error {
var option uintptr
switch flags {
case SCTP_BINDX_ADD_ADDR:
option = SCTP_SOCKOPT_BINDX_ADD
case SCTP_BINDX_REM_ADDR:
option = SCTP_SOCKOPT_BINDX_REM
default:
return syscall.EINVAL
}
buf := addr.ToRawSockAddrBuf()
_, _, err := setsockopt(fd, option, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)))
return err
}
type SCTPConn struct {
_fd int32
notificationHandler NotificationHandler
}
func (c *SCTPConn) fd() int {
return int(atomic.LoadInt32(&c._fd))
}
func NewSCTPConn(fd int, handler NotificationHandler) *SCTPConn {
conn := &SCTPConn{
_fd: int32(fd),
notificationHandler: handler,
}
return conn
}
func (c *SCTPConn) Write(b []byte) (int, error) {
return c.SCTPWrite(b, nil)
}
func (c *SCTPConn) Read(b []byte) (int, error) {
n, _, err := c.SCTPRead(b)
if n < 0 {
n = 0
}
return n, err
}
func (c *SCTPConn) SetInitMsg(numOstreams, maxInstreams, maxAttempts, maxInitTimeout int) error {
return setInitOpts(c.fd(), InitMsg{
NumOstreams: uint16(numOstreams),
MaxInstreams: uint16(maxInstreams),
MaxAttempts: uint16(maxAttempts),
MaxInitTimeout: uint16(maxInitTimeout),
})
}
func (c *SCTPConn) SubscribeEvents(flags int) error {
var d, a, ad, sf, p, sh, pa, ada, au, se uint8
if flags&SCTP_EVENT_DATA_IO > 0 {
d = 1
}
if flags&SCTP_EVENT_ASSOCIATION > 0 {
a = 1
}
if flags&SCTP_EVENT_ADDRESS > 0 {
ad = 1
}
if flags&SCTP_EVENT_SEND_FAILURE > 0 {
sf = 1
}
if flags&SCTP_EVENT_PEER_ERROR > 0 {
p = 1
}
if flags&SCTP_EVENT_SHUTDOWN > 0 {
sh = 1
}
if flags&SCTP_EVENT_PARTIAL_DELIVERY > 0 {
pa = 1
}
if flags&SCTP_EVENT_ADAPTATION_LAYER > 0 {
ada = 1
}
if flags&SCTP_EVENT_AUTHENTICATION > 0 {
au = 1
}
if flags&SCTP_EVENT_SENDER_DRY > 0 {
se = 1
}
param := EventSubscribe{
DataIO: d,
Association: a,
Address: ad,
SendFailure: sf,
PeerError: p,
Shutdown: sh,
PartialDelivery: pa,
AdaptationLayer: ada,
Authentication: au,
SenderDry: se,
}
optlen := unsafe.Sizeof(param)
_, _, err := setsockopt(c.fd(), SCTP_EVENTS, uintptr(unsafe.Pointer(¶m)), uintptr(optlen))
return err
}
func (c *SCTPConn) SubscribedEvents() (int, error) {
param := EventSubscribe{}
optlen := unsafe.Sizeof(param)
_, _, err := getsockopt(c.fd(), SCTP_EVENTS, uintptr(unsafe.Pointer(¶m)), uintptr(unsafe.Pointer(&optlen)))
if err != nil {
return 0, err
}
var flags int
if param.DataIO > 0 {
flags |= SCTP_EVENT_DATA_IO
}
if param.Association > 0 {
flags |= SCTP_EVENT_ASSOCIATION
}
if param.Address > 0 {
flags |= SCTP_EVENT_ADDRESS
}
if param.SendFailure > 0 {
flags |= SCTP_EVENT_SEND_FAILURE
}
if param.PeerError > 0 {
flags |= SCTP_EVENT_PEER_ERROR
}
if param.Shutdown > 0 {
flags |= SCTP_EVENT_SHUTDOWN
}
if param.PartialDelivery > 0 {
flags |= SCTP_EVENT_PARTIAL_DELIVERY
}
if param.AdaptationLayer > 0 {
flags |= SCTP_EVENT_ADAPTATION_LAYER
}
if param.Authentication > 0 {
flags |= SCTP_EVENT_AUTHENTICATION
}
if param.SenderDry > 0 {
flags |= SCTP_EVENT_SENDER_DRY
}
return flags, nil
}
func (c *SCTPConn) SetDefaultSentParam(info *SndRcvInfo) error {
optlen := unsafe.Sizeof(*info)
_, _, err := setsockopt(c.fd(), SCTP_DEFAULT_SENT_PARAM, uintptr(unsafe.Pointer(info)), uintptr(optlen))
return err
}
func (c *SCTPConn) GetDefaultSentParam() (*SndRcvInfo, error) {
info := &SndRcvInfo{}
optlen := unsafe.Sizeof(*info)
_, _, err := getsockopt(c.fd(), SCTP_DEFAULT_SENT_PARAM, uintptr(unsafe.Pointer(info)), uintptr(unsafe.Pointer(&optlen)))
return info, err
}
func (c *SCTPConn) Getsockopt(optname, optval, optlen uintptr) (uintptr, uintptr, error) {
return getsockopt(c.fd(), optname, optval, optlen)
}
func (c *SCTPConn) Setsockopt(optname, optval, optlen uintptr) (uintptr, uintptr, error) {
return setsockopt(c.fd(), optname, optval, optlen)
}
func resolveFromRawAddr(ptr unsafe.Pointer, n int) (*SCTPAddr, error) {
addr := &SCTPAddr{
IPAddrs: make([]net.IPAddr, n),
}
switch family := (*(*syscall.RawSockaddrAny)(ptr)).Addr.Family; family {
case syscall.AF_INET:
addr.Port = int(ntohs(uint16((*(*syscall.RawSockaddrInet4)(ptr)).Port)))
tmp := syscall.RawSockaddrInet4{}
size := unsafe.Sizeof(tmp)
for i := 0; i < n; i++ {
a := *(*syscall.RawSockaddrInet4)(unsafe.Pointer(
uintptr(ptr) + size*uintptr(i)))
addr.IPAddrs[i] = net.IPAddr{IP: a.Addr[:]}
}
case syscall.AF_INET6:
addr.Port = int(ntohs(uint16((*(*syscall.RawSockaddrInet4)(ptr)).Port)))
tmp := syscall.RawSockaddrInet6{}
size := unsafe.Sizeof(tmp)
for i := 0; i < n; i++ {
a := *(*syscall.RawSockaddrInet6)(unsafe.Pointer(
uintptr(ptr) + size*uintptr(i)))
var zone string
ifi, err := net.InterfaceByIndex(int(a.Scope_id))
if err == nil {
zone = ifi.Name
}
addr.IPAddrs[i] = net.IPAddr{IP: a.Addr[:], Zone: zone}
}
default:
return nil, fmt.Errorf("unknown address family: %d", family)
}
return addr, nil
}
func sctpGetAddrs(fd, id, optname int) (*SCTPAddr, error) {
type getaddrs struct {
assocId int32
addrNum uint32
addrs [4096]byte
}
param := getaddrs{
assocId: int32(id),
}
optlen := unsafe.Sizeof(param)
_, _, err := getsockopt(fd, uintptr(optname), uintptr(unsafe.Pointer(¶m)), uintptr(unsafe.Pointer(&optlen)))
if err != nil {
return nil, err
}
return resolveFromRawAddr(unsafe.Pointer(¶m.addrs), int(param.addrNum))
}
func (c *SCTPConn) SCTPGetPrimaryPeerAddr() (*SCTPAddr, error) {
type sctpGetSetPrim struct {
assocId int32
addrs [128]byte
}
param := sctpGetSetPrim{
assocId: int32(0),
}
optlen := unsafe.Sizeof(param)
_, _, err := getsockopt(c.fd(), SCTP_PRIMARY_ADDR, uintptr(unsafe.Pointer(¶m)), uintptr(unsafe.Pointer(&optlen)))
if err != nil {
return nil, err
}
return resolveFromRawAddr(unsafe.Pointer(¶m.addrs), 1)
}
func (c *SCTPConn) SCTPLocalAddr(id int) (*SCTPAddr, error) {
return sctpGetAddrs(c.fd(), id, SCTP_GET_LOCAL_ADDRS)
}
func (c *SCTPConn) SCTPRemoteAddr(id int) (*SCTPAddr, error) {
return sctpGetAddrs(c.fd(), id, SCTP_GET_PEER_ADDRS)
}
func (c *SCTPConn) LocalAddr() net.Addr {
addr, err := sctpGetAddrs(c.fd(), 0, SCTP_GET_LOCAL_ADDRS)
if err != nil {
return nil
}
return addr
}
func (c *SCTPConn) RemoteAddr() net.Addr {
addr, err := sctpGetAddrs(c.fd(), 0, SCTP_GET_PEER_ADDRS)
if err != nil {
return nil
}
return addr
}
func (c *SCTPConn) PeelOff(id int) (*SCTPConn, error) {
type peeloffArg struct {
assocId int32
sd int
}
param := peeloffArg{
assocId: int32(id),
}
optlen := unsafe.Sizeof(param)
_, _, err := getsockopt(c.fd(), SCTP_SOCKOPT_PEELOFF, uintptr(unsafe.Pointer(¶m)), uintptr(unsafe.Pointer(&optlen)))
if err != nil {
return nil, err
}
return &SCTPConn{_fd: int32(param.sd)}, nil
}
func (c *SCTPConn) SetDeadline(t time.Time) error {
return syscall.EOPNOTSUPP
}
func (c *SCTPConn) SetReadDeadline(t time.Time) error {
return syscall.EOPNOTSUPP
}
func (c *SCTPConn) SetWriteDeadline(t time.Time) error {
return syscall.EOPNOTSUPP
}
type SCTPListener struct {
fd int
m sync.Mutex
}
func (ln *SCTPListener) Addr() net.Addr {
laddr, err := sctpGetAddrs(ln.fd, 0, SCTP_GET_LOCAL_ADDRS)
if err != nil {
return nil
}
return laddr
}
type SCTPSndRcvInfoWrappedConn struct {
conn *SCTPConn
}
func NewSCTPSndRcvInfoWrappedConn(conn *SCTPConn) *SCTPSndRcvInfoWrappedConn {
conn.SubscribeEvents(SCTP_EVENT_DATA_IO)
return &SCTPSndRcvInfoWrappedConn{conn}
}
func (c *SCTPSndRcvInfoWrappedConn) Write(b []byte) (int, error) {
if len(b) < int(sndRcvInfoSize) {
return 0, syscall.EINVAL
}
info := (*SndRcvInfo)(unsafe.Pointer(&b[0]))
n, err := c.conn.SCTPWrite(b[sndRcvInfoSize:], info)
return n + int(sndRcvInfoSize), err
}
func (c *SCTPSndRcvInfoWrappedConn) Read(b []byte) (int, error) {
if len(b) < int(sndRcvInfoSize) {
return 0, syscall.EINVAL
}
n, info, err := c.conn.SCTPRead(b[sndRcvInfoSize:])
if err != nil {
return n, err
}
copy(b, toBuf(info))
return n + int(sndRcvInfoSize), err
}
func (c *SCTPSndRcvInfoWrappedConn) Close() error {
return c.conn.Close()
}
func (c *SCTPSndRcvInfoWrappedConn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
func (c *SCTPSndRcvInfoWrappedConn) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
func (c *SCTPSndRcvInfoWrappedConn) SetDeadline(t time.Time) error {
return c.conn.SetDeadline(t)
}
func (c *SCTPSndRcvInfoWrappedConn) SetReadDeadline(t time.Time) error {
return c.conn.SetReadDeadline(t)
}
func (c *SCTPSndRcvInfoWrappedConn) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}
func (c *SCTPSndRcvInfoWrappedConn) SetWriteBuffer(bytes int) error {
return c.conn.SetWriteBuffer(bytes)
}
func (c *SCTPSndRcvInfoWrappedConn) GetWriteBuffer() (int, error) {
return c.conn.GetWriteBuffer()
}
func (c *SCTPSndRcvInfoWrappedConn) SetReadBuffer(bytes int) error {
return c.conn.SetReadBuffer(bytes)
}
func (c *SCTPSndRcvInfoWrappedConn) GetReadBuffer() (int, error) {
return c.conn.GetReadBuffer()
}
// SocketConfig contains options for the SCTP socket.
type SocketConfig struct {
// If Control is not nil it is called after the socket is created but before
// it is bound or connected.
Control func(network, address string, c syscall.RawConn) error
// InitMsg is the options to send in the initial SCTP message
InitMsg InitMsg
}
func (cfg *SocketConfig) Listen(net string, laddr *SCTPAddr) (*SCTPListener, error) {
return listenSCTPExtConfig(net, laddr, cfg.InitMsg, cfg.Control)
}
func (cfg *SocketConfig) Dial(net string, laddr, raddr *SCTPAddr) (*SCTPConn, error) {
return dialSCTPExtConfig(net, laddr, raddr, cfg.InitMsg, cfg.Control)
}
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