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126af9dffc
If the gateway address would be nil which is the case on macOS, we return the preferredSrc added tests for getExistingRIBRouteGateway function update log message
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
package routemanager
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import (
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"fmt"
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"github.com/libp2p/go-netroute"
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log "github.com/sirupsen/logrus"
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"net"
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"net/netip"
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)
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var errRouteNotFound = fmt.Errorf("route not found")
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func addToRouteTableIfNoExists(prefix netip.Prefix, addr string) error {
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gateway, err := getExistingRIBRouteGateway(netip.MustParsePrefix("0.0.0.0/0"))
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if err != nil && err != errRouteNotFound {
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return err
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}
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prefixGateway, err := getExistingRIBRouteGateway(prefix)
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if err != nil && err != errRouteNotFound {
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return err
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}
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if prefixGateway != nil && !prefixGateway.Equal(gateway) {
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log.Warnf("skipping adding a new route for network %s because it already exists and is pointing to the non default gateway: %s", prefix, prefixGateway)
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return nil
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}
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return addToRouteTable(prefix, addr)
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}
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func removeFromRouteTableIfNonSystem(prefix netip.Prefix, addr string) error {
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addrIP := net.ParseIP(addr)
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prefixGateway, err := getExistingRIBRouteGateway(prefix)
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if err != nil {
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return err
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}
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if prefixGateway != nil && !prefixGateway.Equal(addrIP) {
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log.Warnf("route for network %s is pointing to a different gateway: %s, should be pointing to: %s, not removing", prefix, prefixGateway, addrIP)
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return nil
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}
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return removeFromRouteTable(prefix)
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}
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func getExistingRIBRouteGateway(prefix netip.Prefix) (net.IP, error) {
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r, err := netroute.New()
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if err != nil {
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return nil, err
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}
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_, gateway, preferredSrc, err := r.Route(prefix.Addr().AsSlice())
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if err != nil {
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log.Errorf("getting routes returned an error: %v", err)
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return nil, errRouteNotFound
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}
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if gateway == nil {
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return preferredSrc, nil
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}
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return gateway, nil
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}
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