|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "net" |
| 5 | + "os" |
| 6 | + |
| 7 | + envChecks "git.ruekov.eu/ruakij/routingtabletowg/lib/environmentchecks" |
| 8 | + ip2Map "git.ruekov.eu/ruakij/routingtabletowg/lib/iproute2mapping" |
| 9 | + "git.ruekov.eu/ruakij/routingtabletowg/lib/wgchecks" |
| 10 | + |
| 11 | + "github.com/vishvananda/netlink" |
| 12 | + "golang.org/x/sys/unix" |
| 13 | + |
| 14 | + "golang.zx2c4.com/wireguard/wgctrl" |
| 15 | + "golang.zx2c4.com/wireguard/wgctrl/wgtypes" |
| 16 | +) |
| 17 | + |
| 18 | +var envRequired = []string{ |
| 19 | + "INTERFACE", |
| 20 | +} |
| 21 | +var envDefaults = map[string]string{ |
| 22 | + "INTERFACE": "wg0", |
| 23 | + //"MANAGE_ALL": "true", |
| 24 | + |
| 25 | + "FILTER_PROTOCOL": "-1", |
| 26 | + "FILTER_TABLE": "-1", |
| 27 | +} |
| 28 | + |
| 29 | +func main() { |
| 30 | + // Environment-vars |
| 31 | + err := envChecks.HandleRequired(envRequired) |
| 32 | + if(err != nil){ |
| 33 | + logger.Error.Fatal(err) |
| 34 | + } |
| 35 | + envChecks.HandleDefaults(envDefaults) |
| 36 | + |
| 37 | + iface := os.Getenv("INTERFACE") |
| 38 | + //MANAGE_ALL = os.Getenv("MANAGE_ALL") |
| 39 | + |
| 40 | + // Parse filter-env-vars |
| 41 | + filterProtocolStr := os.Getenv("FILTER_PROTOCOL") |
| 42 | + filterProtocol, err := ip2Map.TryGetId(ip2Map.PROTOCOL, filterProtocolStr) |
| 43 | + if err != nil { |
| 44 | + logger.Error.Fatalf("Couldn't read FILTER_PROTOCOL '%s': %s", filterProtocolStr, err) |
| 45 | + } |
| 46 | + |
| 47 | + filterTableStr := os.Getenv("FILTER_TABLE") |
| 48 | + filterTable, err := ip2Map.TryGetId(ip2Map.TABLE, filterTableStr) |
| 49 | + if err != nil { |
| 50 | + logger.Error.Fatalf("Couldn't read FILTER_TABLE '%s': %s", filterTableStr, err) |
| 51 | + } |
| 52 | + |
| 53 | + // Create filter |
| 54 | + filterOptions := FilterOptions{ |
| 55 | + Table: filterTable, |
| 56 | + Protocol: filterProtocol, |
| 57 | + } |
| 58 | + |
| 59 | + // Get Link-Device |
| 60 | + link, err := netlink.LinkByName(iface) |
| 61 | + if err != nil { |
| 62 | + logger.Error.Fatalf("Couldn't get interface '%s': %s", iface, err) |
| 63 | + } |
| 64 | + |
| 65 | + // Test getting wg-client |
| 66 | + client, err := wgctrl.New() |
| 67 | + if err != nil { |
| 68 | + logger.Error.Fatalf("Couldn't create wgctl-client: %s", err) |
| 69 | + } |
| 70 | + // Test getting wg-device |
| 71 | + _, err = client.Device(iface) |
| 72 | + if err != nil { |
| 73 | + logger.Error.Fatalf("Couldn't get wg-interface '%s': %s", iface, err) |
| 74 | + } |
| 75 | + |
| 76 | + |
| 77 | + // Subscribe to route-change events |
| 78 | + routeSubChan, routeSubDoneChan := make(chan netlink.RouteUpdate), make(chan struct{}) |
| 79 | + |
| 80 | + netlink.RouteSubscribe(routeSubChan, routeSubDoneChan) |
| 81 | + go handleRouteEvents(routeSubChan, filterOptions, iface) |
| 82 | + |
| 83 | + //# Initial Route-setup |
| 84 | + // Get routing-table entries from device |
| 85 | + routeList, err := netlink.RouteList(link, netlink.FAMILY_ALL) |
| 86 | + if err != nil { |
| 87 | + logger.Error.Fatalf("Couldn't get route-entries: %s", err) |
| 88 | + } |
| 89 | + |
| 90 | + logger.Info.Printf("Initially setting all current routes") |
| 91 | + for _, route := range routeList { |
| 92 | + // Ignore routes with empty gateway |
| 93 | + if(route.Gw == nil){ |
| 94 | + continue |
| 95 | + } |
| 96 | + |
| 97 | + // Send current routes to handler |
| 98 | + routeSubChan <- netlink.RouteUpdate{ |
| 99 | + Type: unix.RTM_NEWROUTE, |
| 100 | + Route: route, |
| 101 | + } |
| 102 | + } |
| 103 | + |
| 104 | + select {} |
| 105 | +} |
| 106 | + |
| 107 | +var routeUpdateTypeMapFromId = map[uint16]string{ |
| 108 | + unix.RTM_NEWROUTE: "+", |
| 109 | + unix.RTM_DELROUTE: "-", |
| 110 | +} |
| 111 | +// TODO: Add proxy to apply filter in channels rather than.. this mess |
| 112 | +func handleRouteEvents(routeSubChan <-chan netlink.RouteUpdate, filterOptions FilterOptions, iface string) { |
| 113 | + // Create wg-client |
| 114 | + client, err := wgctrl.New() |
| 115 | + if err != nil { |
| 116 | + logger.Error.Fatalf("Couldn't create wgctl-client: %s", err) |
| 117 | + } |
| 118 | + |
| 119 | + for { |
| 120 | + // Receive Route-Updates |
| 121 | + routeUpdate := <-routeSubChan |
| 122 | + route := routeUpdate.Route |
| 123 | + |
| 124 | + // Check filter |
| 125 | + if(!CheckFilter(filterOptions, routeUpdate.Route)){ |
| 126 | + continue |
| 127 | + } |
| 128 | + |
| 129 | + // Special case for default-route |
| 130 | + if route.Dst == nil{ |
| 131 | + if route.Gw.To4() != nil { // IPv4 |
| 132 | + route.Dst = &net.IPNet{ |
| 133 | + IP: net.IPv4zero, |
| 134 | + Mask: net.CIDRMask(0, 32), |
| 135 | + } |
| 136 | + } else { // IPv6 |
| 137 | + route.Dst = &net.IPNet{ |
| 138 | + IP: net.IPv6zero, |
| 139 | + Mask: net.CIDRMask(0, 128), |
| 140 | + } |
| 141 | + } |
| 142 | + } |
| 143 | + |
| 144 | + logger.Info.Printf("Route-Update: [%s] %s via %s", routeUpdateTypeMapFromId[routeUpdate.Type], route.Dst, route.Gw) |
| 145 | + |
| 146 | + // Get wgDevice |
| 147 | + wgDevice, err := client.Device(iface) |
| 148 | + if err != nil { |
| 149 | + logger.Error.Fatalf("Couldn't get wg-interface '%s' while running: %s", iface, err) |
| 150 | + } |
| 151 | + |
| 152 | + // Empty config for filling in switch |
| 153 | + var wgConfig wgtypes.Config |
| 154 | + |
| 155 | + switch routeUpdate.Type{ |
| 156 | + case unix.RTM_NEWROUTE: |
| 157 | + // Check if gateway is set |
| 158 | + if route.Gw == nil{ |
| 159 | + logger.Warn.Printf("Gateway unset, ignoring") |
| 160 | + continue |
| 161 | + } |
| 162 | + |
| 163 | + // Check if other peer already has exact same dst |
| 164 | + if peer, err := wgChecks.PeerByIPNet(wgDevice.Peers, *route.Dst); err == nil { |
| 165 | + logger.Warn.Printf("dst-IPNet already set for Peer '%s', ignoring", peer.PublicKey) |
| 166 | + continue |
| 167 | + } |
| 168 | + |
| 169 | + // Get peer containing gateway-addr |
| 170 | + peer, err := wgChecks.PeerByIP(wgDevice.Peers, route.Gw) |
| 171 | + if(err != nil){ |
| 172 | + logger.Warn.Printf("No peer found containing gw-IP '%s', ignoring", route.Gw) |
| 173 | + continue |
| 174 | + } |
| 175 | + |
| 176 | + // Set peerConfig, this will override set values for that peer |
| 177 | + wgConfig.Peers = []wgtypes.PeerConfig{ |
| 178 | + { |
| 179 | + PublicKey: peer.PublicKey, |
| 180 | + AllowedIPs: append(peer.AllowedIPs, *route.Dst), |
| 181 | + }, |
| 182 | + } |
| 183 | + |
| 184 | + case unix.RTM_DELROUTE: |
| 185 | + // Get peer containing dst-NetIP |
| 186 | + peerIndex, ipNetIndex, err := wgChecks.PeerIndexByIPNet(wgDevice.Peers, *route.Dst) |
| 187 | + if(err != nil){ |
| 188 | + logger.Warn.Printf("No peer found having dst-IPNet '%s', ignoring", route.Dst) |
| 189 | + continue |
| 190 | + } |
| 191 | + peer := wgDevice.Peers[peerIndex] |
| 192 | + |
| 193 | + // Delete dstNet from allowedIPs |
| 194 | + peer.AllowedIPs[ipNetIndex] = peer.AllowedIPs[len(peer.AllowedIPs)-1] |
| 195 | + peer.AllowedIPs = peer.AllowedIPs[:len(peer.AllowedIPs)-1] |
| 196 | + |
| 197 | + // Set peerConfig, this will override set values for that peer |
| 198 | + wgConfig.Peers = []wgtypes.PeerConfig{ |
| 199 | + { |
| 200 | + PublicKey: peer.PublicKey, |
| 201 | + UpdateOnly: true, |
| 202 | + |
| 203 | + ReplaceAllowedIPs: true, |
| 204 | + AllowedIPs: peer.AllowedIPs, |
| 205 | + }, |
| 206 | + } |
| 207 | + } |
| 208 | + |
| 209 | + err = client.ConfigureDevice(iface, wgConfig) |
| 210 | + if(err != nil){ |
| 211 | + logger.Error.Fatalf("Error configuring wg-device '%s': %s", iface, err) |
| 212 | + } |
| 213 | + } |
| 214 | +} |
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