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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package controlclient
import (
"fmt"
"net"
"tailscale.com/tailcfg"
"tailscale.com/wgengine/filter"
)
func parseIP(host string, defaultBits int) (filter.Net, error) {
ip := net.ParseIP(host)
if ip != nil && ip.IsUnspecified() {
// For clarity, reject 0.0.0.0 as an input
return filter.NetNone, fmt.Errorf("ports=%#v: to allow all IP addresses, use *:port, not 0.0.0.0:port", host)
} else if ip == nil && host == "*" {
// User explicitly requested wildcard dst ip
return filter.NetAny, nil
} else {
if ip != nil {
ip = ip.To4()
}
if ip == nil || len(ip) != 4 {
return filter.NetNone, fmt.Errorf("ports=%#v: invalid IPv4 address", host)
}
return filter.Net{
IP: filter.NewIP(ip),
Mask: filter.Netmask(defaultBits),
}, nil
}
}
// Parse a backward-compatible FilterRule used by control's wire format,
// producing the most current filter.Matches format.
func (c *Direct) parsePacketFilter(pf []tailcfg.FilterRule) filter.Matches {
mm := make([]filter.Match, 0, len(pf))
var erracc error
for _, r := range pf {
m := filter.Match{}
for i, s := range r.SrcIPs {
bits := 32
if len(r.SrcBits) > i {
bits = r.SrcBits[i]
}
net, err := parseIP(s, bits)
if err != nil && erracc == nil {
erracc = err
continue
}
m.Srcs = append(m.Srcs, net)
}
for _, d := range r.DstPorts {
bits := 32
if d.Bits != nil {
bits = *d.Bits
}
net, err := parseIP(d.IP, bits)
if err != nil && erracc == nil {
erracc = err
continue
}
m.Dsts = append(m.Dsts, filter.NetPortRange{
Net: net,
Ports: filter.PortRange{
First: d.Ports.First,
Last: d.Ports.Last,
},
})
}
mm = append(mm, m)
}
if erracc != nil {
c.logf("parsePacketFilter: %s\n", erracc)
}
return mm
}
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