64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package routing
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import (
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"fmt"
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)
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type Setuper interface {
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Setup() (err error)
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}
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func (r *Routing) Setup() (err error) {
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defaultInterfaceName, defaultGateway, err := r.DefaultRoute()
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if err != nil {
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return fmt.Errorf("cannot get default route: %w", err)
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}
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touched := false
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defer func() {
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if err != nil && touched {
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if tearDownErr := r.TearDown(); tearDownErr != nil {
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r.logger.Error("cannot reverse routing changes: " + tearDownErr.Error())
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}
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}
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}()
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touched = true
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err = r.routeInboundFromDefault(defaultGateway, defaultInterfaceName)
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if err != nil {
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return fmt.Errorf("cannot add routes for inbound traffic from default IP: %w", err)
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}
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r.stateMutex.RLock()
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outboundSubnets := r.outboundSubnets
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r.stateMutex.RUnlock()
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if err := r.setOutboundRoutes(outboundSubnets, defaultInterfaceName, defaultGateway); err != nil {
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return fmt.Errorf("cannot set outbound subnets routes: %w", err)
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}
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return nil
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}
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type TearDowner interface {
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TearDown() error
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}
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func (r *Routing) TearDown() error {
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defaultInterfaceName, defaultGateway, err := r.DefaultRoute()
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if err != nil {
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return fmt.Errorf("cannot get default route: %w", err)
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}
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err = r.unrouteInboundFromDefault(defaultGateway, defaultInterfaceName)
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if err != nil {
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return fmt.Errorf("cannot remove routes for inbound traffic from default IP: %w", err)
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}
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if err := r.setOutboundRoutes(nil, defaultInterfaceName, defaultGateway); err != nil {
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return fmt.Errorf("cannot set outbound subnets routes: %w", err)
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}
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return nil
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}
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