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conngater.go
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/
conngater.go
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package net
import (
"context"
"net"
"golang.org/x/xerrors"
logging "github.com/ipfs/go-log/v2"
manet "github.com/multiformats/go-multiaddr/net"
"github.com/filecoin-project/lotus/api"
)
var cLog = logging.Logger("conngater")
func (a *NetAPI) NetBlockAdd(ctx context.Context, acl api.NetBlockList) error {
for _, p := range acl.Peers {
err := a.ConnGater.BlockPeer(p)
if err != nil {
return xerrors.Errorf("error blocking peer %s: %w", p, err)
}
for _, c := range a.Host.Network().ConnsToPeer(p) {
err = c.Close()
if err != nil {
// just log this, don't fail
cLog.Warnf("error closing connection to %s: %s", p, err)
}
}
}
for _, addr := range acl.IPAddrs {
ip := net.ParseIP(addr)
if ip == nil {
return xerrors.Errorf("error parsing IP address %s", addr)
}
err := a.ConnGater.BlockAddr(ip)
if err != nil {
return xerrors.Errorf("error blocking IP address %s: %w", addr, err)
}
for _, c := range a.Host.Network().Conns() {
remote := c.RemoteMultiaddr()
remoteIP, err := manet.ToIP(remote)
if err != nil {
continue
}
if ip.Equal(remoteIP) {
err = c.Close()
if err != nil {
// just log this, don't fail
cLog.Warnf("error closing connection to %s: %s", remoteIP, err)
}
}
}
}
for _, subnet := range acl.IPSubnets {
_, cidr, err := net.ParseCIDR(subnet)
if err != nil {
return xerrors.Errorf("error parsing subnet %s: %w", subnet, err)
}
err = a.ConnGater.BlockSubnet(cidr)
if err != nil {
return xerrors.Errorf("error blocking subunet %s: %w", subnet, err)
}
for _, c := range a.Host.Network().Conns() {
remote := c.RemoteMultiaddr()
remoteIP, err := manet.ToIP(remote)
if err != nil {
continue
}
if cidr.Contains(remoteIP) {
err = c.Close()
if err != nil {
// just log this, don't fail
cLog.Warnf("error closing connection to %s: %s", remoteIP, err)
}
}
}
}
return nil
}
func (a *NetAPI) NetBlockRemove(ctx context.Context, acl api.NetBlockList) error {
for _, p := range acl.Peers {
err := a.ConnGater.UnblockPeer(p)
if err != nil {
return xerrors.Errorf("error unblocking peer %s: %w", p, err)
}
}
for _, addr := range acl.IPAddrs {
ip := net.ParseIP(addr)
if ip == nil {
return xerrors.Errorf("error parsing IP address %s", addr)
}
err := a.ConnGater.UnblockAddr(ip)
if err != nil {
return xerrors.Errorf("error unblocking IP address %s: %w", addr, err)
}
}
for _, subnet := range acl.IPSubnets {
_, cidr, err := net.ParseCIDR(subnet)
if err != nil {
return xerrors.Errorf("error parsing subnet %s: %w", subnet, err)
}
err = a.ConnGater.UnblockSubnet(cidr)
if err != nil {
return xerrors.Errorf("error unblocking subunet %s: %w", subnet, err)
}
}
return nil
}
func (a *NetAPI) NetBlockList(ctx context.Context) (result api.NetBlockList, err error) {
result.Peers = a.ConnGater.ListBlockedPeers()
for _, ip := range a.ConnGater.ListBlockedAddrs() {
result.IPAddrs = append(result.IPAddrs, ip.String())
}
for _, subnet := range a.ConnGater.ListBlockedSubnets() {
result.IPSubnets = append(result.IPSubnets, subnet.String())
}
return
}