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|
package main
import (
"fmt"
"golang.org/x/sys/unix"
)
type pppChannel struct {
pppoxSk int
pppSk int
channelIndex int
}
func newPPPChannel(pppoxSk int) (c *pppChannel, err error) {
idx, err := unix.IoctlGetUint32(pppoxSk, unix.PPPIOCGCHAN)
if err != nil {
return nil, fmt.Errorf("failed to get pppox channel index: %v", err)
}
pppSk, err := unix.Open("/dev/ppp", unix.O_RDWR, 0)
if err != nil {
return nil, fmt.Errorf("failed to open /dev/ppp: %v", err)
}
err = unix.IoctlSetPointerInt(pppSk, unix.PPPIOCATTCHAN, int(idx))
if err != nil {
unix.Close(pppSk)
return nil, fmt.Errorf("failed to attach to channel %v: %v", idx, err)
}
return &pppChannel{
pppoxSk: pppoxSk,
pppSk: pppSk,
channelIndex: int(idx),
}, nil
}
func (c *pppChannel) bridge(to *pppChannel) (err error) {
/* FIXME: not upstream yet! */
var PPPIOCBRIDGECHAN uint = 0x40047435
err = unix.IoctlSetPointerInt(c.pppSk, PPPIOCBRIDGECHAN, to.channelIndex)
if err != nil {
return fmt.Errorf("failed to bridge ppp channels: %v", err)
}
return nil
}
func (c *pppChannel) close() {
if c != nil {
if c.pppoxSk >= 0 {
unix.Close(c.pppoxSk)
}
if c.pppSk >= 0 {
unix.Close(c.pppSk)
}
}
}
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