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Support for feature bits: IPv4_LISTEN and IPv6_LISTEN

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Share IPv4/IPv6 peer connections only if supported by the remote peer.
This commit is contained in:
Kleissner
2021-04-05 14:58:47 +02:00
parent d83123bf46
commit b2cbe2d066
6 changed files with 76 additions and 23 deletions
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28
Connection.go
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@@ -56,18 +56,36 @@ func (peer *PeerInfo) GetConnections(active bool) (connections []*Connection) {
return peer.connectionInactive
}
// GetConnection2Share returns a connection to share. Nil if none.
// allowLocal specifies whether it is OK to return local IPs.
func (peer *PeerInfo) GetConnection2Share(allowLocal bool) (connections *Connection) {
// IsConnectable checks if the peer is connectable to the given IP parameters.
func (peer *PeerInfo) IsConnectable(allowLocal, allowIPv4, allowIPv6 bool) bool {
peer.RLock()
defer peer.RUnlock()
if peer.connectionLatest != nil && !(!allowLocal && peer.connectionLatest.IsLocal()) {
// Only 1 active connection must be allowed for being connectable.
for _, connection := range peer.connectionActive {
if IsIPv4(connection.Address.IP) && allowIPv4 || IsIPv6(connection.Address.IP) && allowIPv6 {
if !(!allowLocal && connection.IsLocal()) {
return true
}
}
}
return false
}
// GetConnection2Share returns a connection to share. Nil if none.
// allowLocal specifies whether it is OK to return local IPs.
func (peer *PeerInfo) GetConnection2Share(allowLocal, allowIPv4, allowIPv6 bool) (connections *Connection) {
peer.RLock()
defer peer.RUnlock()
if peer.connectionLatest != nil && !(!allowLocal && peer.connectionLatest.IsLocal()) &&
(IsIPv4(peer.connectionLatest.Address.IP) && allowIPv4 || IsIPv6(peer.connectionLatest.Address.IP) && allowIPv6) {
return peer.connectionLatest
}
for _, connection := range peer.connectionActive {
if !(!allowLocal && connection.IsLocal()) {
if (IsIPv4(connection.Address.IP) && allowIPv4 || IsIPv6(connection.Address.IP) && allowIPv6) && !(!allowLocal && connection.IsLocal()) {
return connection
}
}