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package pgtype
import (
"database/sql/driver"
"net"
"github.com/pkg/errors"
)
// Network address family is dependent on server socket.h value for AF_INET.
// In practice, all platforms appear to have the same value. See
// src/include/utils/inet.h for more information.
const (
defaultAFInet = 2
defaultAFInet6 = 3
)
// Inet represents both inet and cidr PostgreSQL types.
type Inet struct {
IPNet *net.IPNet
Status Status
}
func (dst *Inet) Set(src interface{}) error {
if src == nil {
*dst = Inet{Status: Null}
return nil
}
switch value := src.(type) {
case net.IPNet:
*dst = Inet{IPNet: &value, Status: Present}
case *net.IPNet:
*dst = Inet{IPNet: value, Status: Present}
case net.IP:
bitCount := len(value) * 8
mask := net.CIDRMask(bitCount, bitCount)
*dst = Inet{IPNet: &net.IPNet{Mask: mask, IP: value}, Status: Present}
case string:
_, ipnet, err := net.ParseCIDR(value)
if err != nil {
return err
}
*dst = Inet{IPNet: ipnet, Status: Present}
default:
if originalSrc, ok := underlyingPtrType(src); ok {
return dst.Set(originalSrc)
}
return errors.Errorf("cannot convert %v to Inet", value)
}
return nil
}
func (dst *Inet) Get() interface{} {
switch dst.Status {
case Present:
return dst.IPNet
case Null:
return nil
default:
return dst.Status
}
}
func (src *Inet) AssignTo(dst interface{}) error {
switch src.Status {
case Present:
switch v := dst.(type) {
case *net.IPNet:
*v = net.IPNet{
IP: make(net.IP, len(src.IPNet.IP)),
Mask: make(net.IPMask, len(src.IPNet.Mask)),
}
copy(v.IP, src.IPNet.IP)
copy(v.Mask, src.IPNet.Mask)
return nil
case *net.IP:
if oneCount, bitCount := src.IPNet.Mask.Size(); oneCount != bitCount {
return errors.Errorf("cannot assign %v to %T", src, dst)
}
*v = make(net.IP, len(src.IPNet.IP))
copy(*v, src.IPNet.IP)
return nil
default:
if nextDst, retry := GetAssignToDstType(dst); retry {
return src.AssignTo(nextDst)
}
}
case Null:
return NullAssignTo(dst)
}
return errors.Errorf("cannot decode %#v into %T", src, dst)
}
func (dst *Inet) DecodeText(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Inet{Status: Null}
return nil
}
var ipnet *net.IPNet
var err error
if ip := net.ParseIP(string(src)); ip != nil {
ipv4 := ip.To4()
if ipv4 != nil {
ip = ipv4
}
bitCount := len(ip) * 8
mask := net.CIDRMask(bitCount, bitCount)
ipnet = &net.IPNet{Mask: mask, IP: ip}
} else {
_, ipnet, err = net.ParseCIDR(string(src))
if err != nil {
return err
}
}
*dst = Inet{IPNet: ipnet, Status: Present}
return nil
}
func (dst *Inet) DecodeBinary(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Inet{Status: Null}
return nil
}
if len(src) != 8 && len(src) != 20 {
return errors.Errorf("Received an invalid size for a inet: %d", len(src))
}
// ignore family
bits := src[1]
// ignore is_cidr
addressLength := src[3]
var ipnet net.IPNet
ipnet.IP = make(net.IP, int(addressLength))
copy(ipnet.IP, src[4:])
ipnet.Mask = net.CIDRMask(int(bits), int(addressLength)*8)
*dst = Inet{IPNet: &ipnet, Status: Present}
return nil
}
func (src *Inet) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
return append(buf, src.IPNet.String()...), nil
}
// EncodeBinary encodes src into w.
func (src *Inet) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
var family byte
switch len(src.IPNet.IP) {
case net.IPv4len:
family = defaultAFInet
case net.IPv6len:
family = defaultAFInet6
default:
return nil, errors.Errorf("Unexpected IP length: %v", len(src.IPNet.IP))
}
buf = append(buf, family)
ones, _ := src.IPNet.Mask.Size()
buf = append(buf, byte(ones))
// is_cidr is ignored on server
buf = append(buf, 0)
buf = append(buf, byte(len(src.IPNet.IP)))
return append(buf, src.IPNet.IP...), nil
}
// Scan implements the database/sql Scanner interface.
func (dst *Inet) Scan(src interface{}) error {
if src == nil {
*dst = Inet{Status: Null}
return nil
}
switch src := src.(type) {
case string:
return dst.DecodeText(nil, []byte(src))
case []byte:
srcCopy := make([]byte, len(src))
copy(srcCopy, src)
return dst.DecodeText(nil, srcCopy)
}
return errors.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src *Inet) Value() (driver.Value, error) {
return EncodeValueText(src)
}
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