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driver_net.go
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/
driver_net.go
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package bertybridge
import (
"fmt"
"net"
"strings"
"go.uber.org/zap"
)
type NativeNetDriver interface {
InterfaceAddrs() (*NetAddrs, error)
Interfaces() (*NetInterfaces, error)
}
type inet struct {
net NativeNetDriver
logger *zap.Logger
}
func (ia *inet) Interfaces() ([]net.Interface, error) {
ifaces, err := ia.net.Interfaces()
if err != nil {
return nil, err
}
return ifaces.Interfaces(), nil
}
func (ia *inet) InterfaceAddrs() ([]net.Addr, error) {
na, err := ia.net.InterfaceAddrs()
if err != nil {
return nil, err
}
addrs := []net.Addr{}
for _, addr := range na.addrs {
if addr == "" {
continue
}
// skip interface name
ips := strings.Split(addr, "%")
if len(ips) == 0 {
ia.logger.Debug("empty addr while parsing interface addrs")
continue
}
ip := ips[0]
// resolve ip
v, err := net.ResolveIPAddr("ip", ip)
if err != nil {
ia.logger.Warn("unable to resolve addr", zap.String("addr", ip))
continue
}
addrs = append(addrs, v)
}
fields := make([]string, len(addrs))
for i, addr := range addrs {
fields[i] = addr.String()
}
ia.logger.Debug("driver interface resolved addrs", zap.Strings("addrs", fields))
return addrs, nil
}
type NetInterfaces struct {
ifaces []*NetInterface
}
func (n *NetInterfaces) Interfaces() []net.Interface {
ifaces := make([]net.Interface, len(n.ifaces))
for i, iface := range n.ifaces {
ifaces[i] = iface.Interface()
}
return ifaces
}
func (n *NetInterfaces) Append(i *NetInterface) {
n.ifaces = append(n.ifaces, i)
}
const (
NetFlagUp int = iota // interface is up
NetFlagBroadcast // interface supports broadcast access capability
NetFlagLoopback // interface is a loopback interface
NetFlagPointToPoint // interface belongs to a point-to-point link
NetFlagMulticast // interface supports multicast access capability
)
type NetInterface struct {
Index int // positive integer that starts at one, zero is never used
MTU int // maximum transmission unit
Name string // e.g., "en0", "lo0", "eth0.100"
Addrs *NetAddrs // InterfaceAddresses
hardwareaddr []byte // IEEE MAC-48, EUI-48 and EUI-64 form
flags net.Flags // e.g., FlagUp, FlagLoopback, FlagMulticast
}
func (n *NetInterface) CopyHardwareAddr(addr []byte) {
n.hardwareaddr = make([]byte, len(n.hardwareaddr))
copy(n.hardwareaddr, addr)
}
func (n *NetInterface) Interface() net.Interface {
return net.Interface{
Index: n.Index,
MTU: n.MTU,
Name: n.Name,
HardwareAddr: n.hardwareaddr,
Flags: n.flags,
}
}
func (n *NetInterface) AddFlag(flag int) (err error) {
switch flag {
case NetFlagUp:
n.flags |= net.FlagUp
case NetFlagBroadcast:
n.flags |= net.FlagBroadcast
case NetFlagLoopback:
n.flags |= net.FlagLoopback
case NetFlagPointToPoint:
n.flags |= net.FlagPointToPoint
case NetFlagMulticast:
n.flags |= net.FlagMulticast
default:
err = fmt.Errorf("failed to add unknown flag to net interface: %d", flag)
}
return
}
type NetAddrs struct {
addrs []string
}
func NewNetAddrs() *NetAddrs {
return &NetAddrs{addrs: []string{}}
}
func (n *NetAddrs) AppendAddr(addr string) {
n.addrs = append(n.addrs, addr)
}