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fix #1842

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Warn about banning a single IPv6 address
This commit is contained in:
Shivaram Lingamneni 2021-11-30 03:27:40 -05:00
parent eef9753912
commit fd45529d94
3 changed files with 54 additions and 1 deletions
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8
irc/flatip/flatip.go
View File

@ -155,6 +155,14 @@ func (cidr IPNet) Contains(ip IP) bool {
return cidr.IP == maskedIP
}
func (cidr IPNet) Size() (ones, bits int) {
if cidr.IP.IsIPv4() {
return int(cidr.PrefixLen) - 96, 32
} else {
return int(cidr.PrefixLen), 128
}
}
// FromNetIPnet converts a net.IPNet into an IPNet.
func FromNetIPNet(network net.IPNet) (result IPNet) {
ones, _ := network.Mask.Size()

34
irc/flatip/flatip_test.go
View File

@ -2,8 +2,10 @@ package flatip
import (
"bytes"
"fmt"
"math/rand"
"net"
"reflect"
"testing"
"time"
)
@ -86,6 +88,38 @@ func doMaskingTest(ip net.IP, t *testing.T) {
}
}
func assertEqual(found, expected interface{}) {
if !reflect.DeepEqual(found, expected) {
panic(fmt.Sprintf("expected %#v, found %#v", expected, found))
}
}
func TestSize(t *testing.T) {
_, net, err := ParseCIDR("8.8.8.8/24")
if err != nil {
panic(err)
}
ones, bits := net.Size()
assertEqual(ones, 24)
assertEqual(bits, 32)
_, net, err = ParseCIDR("2001::0db8/64")
if err != nil {
panic(err)
}
ones, bits = net.Size()
assertEqual(ones, 64)
assertEqual(bits, 128)
_, net, err = ParseCIDR("2001::0db8/96")
if err != nil {
panic(err)
}
ones, bits = net.Size()
assertEqual(ones, 96)
assertEqual(bits, 128)
}
func TestMasking(t *testing.T) {
for _, ipstr := range testIPStrs {
doMaskingTest(easyParseIP(ipstr), t)

13
irc/uban.go
View File

@ -366,7 +366,14 @@ func ubanInfoHandler(client *Client, target ubanTarget, params []string, rb *Res
}
func ubanInfoCIDR(client *Client, target ubanTarget, rb *ResponseBuffer) {
if target.cidr.PrefixLen == 128 {
config := client.server.Config()
// show connection limiter/throttler state if this CIDR is entirely
// contained in a single limiter/throttler bucket:
ones, bits := target.cidr.Size()
showLimiter := (bits == 32 && ones >= config.Server.IPLimits.CidrLenIPv4) ||
(bits == 128 && ones >= config.Server.IPLimits.CidrLenIPv6)
sendMaskWarning := (bits == 128 && ones > config.Server.IPLimits.CidrLenIPv6)
if showLimiter {
netName, status := client.server.connectionLimiter.Status(target.cidr.IP)
if status.Exempt {
rb.Notice(fmt.Sprintf(client.t("IP %s is exempt from connection limits"), target.cidr.IP.String()))
@ -391,6 +398,10 @@ func ubanInfoCIDR(client *Client, target ubanTarget, rb *ResponseBuffer) {
rb.Notice(line)
}
}
if sendMaskWarning {
rb.Notice(fmt.Sprintf(client.t("Note: try evaluating a wider IPv6 CIDR like %s/%d"),
target.cidr.IP.String(), config.Server.IPLimits.CidrLenIPv6))
}
}
func ubanInfoNickmask(client *Client, target ubanTarget, rb *ResponseBuffer) {