mirror of
https://github.com/TecharoHQ/anubis.git
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9affd2edf4
Imports a patch previously exclusive to Botstopper. Signed-off-by: Xe Iaso <me@xeiaso.net>
85 lines
2.5 KiB
Go
85 lines
2.5 KiB
Go
package thoth
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import (
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"context"
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"errors"
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"fmt"
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"log/slog"
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"net/netip"
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iptoasnv1 "github.com/TecharoHQ/thoth-proto/gen/techaro/thoth/iptoasn/v1"
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"github.com/gaissmai/bart"
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"google.golang.org/grpc"
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)
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type IPToASNWithCache struct {
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next iptoasnv1.IpToASNServiceClient
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table *bart.Table[*iptoasnv1.LookupResponse]
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}
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func NewIpToASNWithCache(next iptoasnv1.IpToASNServiceClient) *IPToASNWithCache {
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result := &IPToASNWithCache{
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next: next,
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table: &bart.Table[*iptoasnv1.LookupResponse]{},
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}
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for _, pfx := range []netip.Prefix{
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netip.MustParsePrefix("10.0.0.0/8"), // RFC 1918
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netip.MustParsePrefix("172.16.0.0/12"), // RFC 1918
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netip.MustParsePrefix("192.168.0.0/16"), // RFC 1918
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netip.MustParsePrefix("127.0.0.0/8"), // Loopback
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netip.MustParsePrefix("169.254.0.0/16"), // Link-local
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netip.MustParsePrefix("100.64.0.0/10"), // CGNAT
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netip.MustParsePrefix("192.0.0.0/24"), // Protocol assignments
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netip.MustParsePrefix("192.0.2.0/24"), // TEST-NET-1
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netip.MustParsePrefix("198.18.0.0/15"), // Benchmarking
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netip.MustParsePrefix("198.51.100.0/24"), // TEST-NET-2
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netip.MustParsePrefix("203.0.113.0/24"), // TEST-NET-3
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netip.MustParsePrefix("240.0.0.0/4"), // Reserved
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netip.MustParsePrefix("255.255.255.255/32"), // Broadcast
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netip.MustParsePrefix("fc00::/7"), // Unique local address
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netip.MustParsePrefix("fe80::/10"), // Link-local
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netip.MustParsePrefix("::1/128"), // Loopback
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netip.MustParsePrefix("::/128"), // Unspecified
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netip.MustParsePrefix("100::/64"), // Discard-only
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netip.MustParsePrefix("2001:db8::/32"), // Documentation
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} {
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result.table.Insert(pfx, &iptoasnv1.LookupResponse{Announced: false})
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}
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return result
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}
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func (ip2asn *IPToASNWithCache) Lookup(ctx context.Context, lr *iptoasnv1.LookupRequest, opts ...grpc.CallOption) (*iptoasnv1.LookupResponse, error) {
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addr, err := netip.ParseAddr(lr.GetIpAddress())
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if err != nil {
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return nil, fmt.Errorf("input is not an IP address: %w", err)
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}
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cachedResponse, ok := ip2asn.table.Lookup(addr)
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if ok {
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return cachedResponse, nil
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}
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resp, err := ip2asn.next.Lookup(ctx, lr, opts...)
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if err != nil {
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return nil, err
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}
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var errs []error
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for _, cidr := range resp.GetCidr() {
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pfx, err := netip.ParsePrefix(cidr)
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if err != nil {
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errs = append(errs, err)
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continue
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}
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ip2asn.table.Insert(pfx, resp)
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}
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if len(errs) != 0 {
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slog.Error("errors parsing IP prefixes", "err", errors.Join(errs...))
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}
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return resp, nil
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}
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