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ac0fe6025b
* Handle zones properly * Use host routes for single IPs * Add GOOS and GOARCH to startup log * Log powershell command
101 lines
2.0 KiB
Go
101 lines
2.0 KiB
Go
//go:build darwin || dragonfly || freebsd || netbsd || openbsd
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package routemanager
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import (
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"fmt"
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"net"
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"net/netip"
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"syscall"
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log "github.com/sirupsen/logrus"
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"golang.org/x/net/route"
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)
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// selected BSD Route flags.
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const (
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RTF_UP = 0x1
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RTF_GATEWAY = 0x2
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RTF_HOST = 0x4
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RTF_REJECT = 0x8
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RTF_DYNAMIC = 0x10
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RTF_MODIFIED = 0x20
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RTF_STATIC = 0x800
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RTF_BLACKHOLE = 0x1000
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RTF_LOCAL = 0x200000
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RTF_BROADCAST = 0x400000
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RTF_MULTICAST = 0x800000
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)
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func getRoutesFromTable() ([]netip.Prefix, error) {
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tab, err := route.FetchRIB(syscall.AF_UNSPEC, route.RIBTypeRoute, 0)
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if err != nil {
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return nil, err
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}
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msgs, err := route.ParseRIB(route.RIBTypeRoute, tab)
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if err != nil {
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return nil, err
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}
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var prefixList []netip.Prefix
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for _, msg := range msgs {
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m := msg.(*route.RouteMessage)
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if m.Version < 3 || m.Version > 5 {
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return nil, fmt.Errorf("unexpected RIB message version: %d", m.Version)
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}
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if m.Type != 4 /* RTM_GET */ {
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return nil, fmt.Errorf("unexpected RIB message type: %d", m.Type)
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}
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if m.Flags&RTF_UP == 0 ||
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m.Flags&(RTF_REJECT|RTF_BLACKHOLE) != 0 {
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continue
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}
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if len(m.Addrs) < 3 {
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log.Warnf("Unexpected RIB message Addrs: %v", m.Addrs)
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continue
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}
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addr, ok := toNetIPAddr(m.Addrs[0])
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if !ok {
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continue
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}
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cidr := 32
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if mask := m.Addrs[2]; mask != nil {
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cidr, ok = toCIDR(mask)
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if !ok {
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log.Debugf("Unexpected RIB message Addrs[2]: %v", mask)
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continue
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}
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}
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routePrefix := netip.PrefixFrom(addr, cidr)
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if routePrefix.IsValid() {
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prefixList = append(prefixList, routePrefix)
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}
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}
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return prefixList, nil
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}
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func toNetIPAddr(a route.Addr) (netip.Addr, bool) {
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switch t := a.(type) {
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case *route.Inet4Addr:
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return netip.AddrFrom4(t.IP), true
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default:
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return netip.Addr{}, false
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}
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}
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func toCIDR(a route.Addr) (int, bool) {
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switch t := a.(type) {
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case *route.Inet4Addr:
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mask := net.IPv4Mask(t.IP[0], t.IP[1], t.IP[2], t.IP[3])
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cidr, _ := mask.Size()
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return cidr, true
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default:
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return 0, false
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}
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}
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