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filter.go
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filter.go
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package filter
import (
"net"
"sync"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr-net"
)
type Filters struct {
mu sync.RWMutex
filters map[string]*net.IPNet
}
func NewFilters() *Filters {
return &Filters{
filters: make(map[string]*net.IPNet),
}
}
func (fs *Filters) AddDialFilter(f *net.IPNet) {
fs.mu.Lock()
defer fs.mu.Unlock()
fs.filters[f.String()] = f
}
func (f *Filters) AddrBlocked(a ma.Multiaddr) bool {
maddr := ma.Split(a)
if len(maddr) == 0 {
return false
}
netaddr, err := manet.ToNetAddr(maddr[0])
if err != nil {
// if we cant parse it, its probably not blocked
return false
}
netip := net.ParseIP(netaddr.String())
if netip == nil {
return false
}
f.mu.RLock()
defer f.mu.RUnlock()
for _, ft := range f.filters {
if ft.Contains(netip) {
return true
}
}
return false
}
func (f *Filters) Filters() []*net.IPNet {
var out []*net.IPNet
f.mu.RLock()
defer f.mu.RUnlock()
for _, ff := range f.filters {
out = append(out, ff)
}
return out
}
func (f *Filters) Remove(ff *net.IPNet) {
f.mu.Lock()
defer f.mu.Unlock()
delete(f.filters, ff.String())
}