mirror of
https://github.com/juanfont/headscale.git
synced 2024-11-26 08:53:05 +00:00
142 lines
2.9 KiB
Go
142 lines
2.9 KiB
Go
package hscontrol
|
|
|
|
import (
|
|
"fmt"
|
|
"net/netip"
|
|
"strings"
|
|
|
|
"go4.org/netipx"
|
|
"tailscale.com/tailcfg"
|
|
)
|
|
|
|
// This is borrowed from, and updated to use IPSet
|
|
// https://github.com/tailscale/tailscale/blob/71029cea2ddf82007b80f465b256d027eab0f02d/wgengine/filter/tailcfg.go#L97-L162
|
|
// TODO(kradalby): contribute upstream and make public.
|
|
var (
|
|
zeroIP4 = netip.AddrFrom4([4]byte{})
|
|
zeroIP6 = netip.AddrFrom16([16]byte{})
|
|
)
|
|
|
|
// parseIPSet parses arg as one:
|
|
//
|
|
// - an IP address (IPv4 or IPv6)
|
|
// - the string "*" to match everything (both IPv4 & IPv6)
|
|
// - a CIDR (e.g. "192.168.0.0/16")
|
|
// - a range of two IPs, inclusive, separated by hyphen ("2eff::1-2eff::0800")
|
|
//
|
|
// bits, if non-nil, is the legacy SrcBits CIDR length to make a IP
|
|
// address (without a slash) treated as a CIDR of *bits length.
|
|
// nolint
|
|
func parseIPSet(arg string, bits *int) (*netipx.IPSet, error) {
|
|
var ipSet netipx.IPSetBuilder
|
|
if arg == "*" {
|
|
ipSet.AddPrefix(netip.PrefixFrom(zeroIP4, 0))
|
|
ipSet.AddPrefix(netip.PrefixFrom(zeroIP6, 0))
|
|
|
|
return ipSet.IPSet()
|
|
}
|
|
if strings.Contains(arg, "/") {
|
|
pfx, err := netip.ParsePrefix(arg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if pfx != pfx.Masked() {
|
|
return nil, fmt.Errorf("%v contains non-network bits set", pfx)
|
|
}
|
|
|
|
ipSet.AddPrefix(pfx)
|
|
|
|
return ipSet.IPSet()
|
|
}
|
|
if strings.Count(arg, "-") == 1 {
|
|
ip1s, ip2s, _ := strings.Cut(arg, "-")
|
|
|
|
ip1, err := netip.ParseAddr(ip1s)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ip2, err := netip.ParseAddr(ip2s)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
r := netipx.IPRangeFrom(ip1, ip2)
|
|
if !r.IsValid() {
|
|
return nil, fmt.Errorf("invalid IP range %q", arg)
|
|
}
|
|
|
|
for _, prefix := range r.Prefixes() {
|
|
ipSet.AddPrefix(prefix)
|
|
}
|
|
|
|
return ipSet.IPSet()
|
|
}
|
|
ip, err := netip.ParseAddr(arg)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("invalid IP address %q", arg)
|
|
}
|
|
bits8 := uint8(ip.BitLen())
|
|
if bits != nil {
|
|
if *bits < 0 || *bits > int(bits8) {
|
|
return nil, fmt.Errorf("invalid CIDR size %d for IP %q", *bits, arg)
|
|
}
|
|
bits8 = uint8(*bits)
|
|
}
|
|
|
|
ipSet.AddPrefix(netip.PrefixFrom(ip, int(bits8)))
|
|
|
|
return ipSet.IPSet()
|
|
}
|
|
|
|
type Match struct {
|
|
Srcs *netipx.IPSet
|
|
Dests *netipx.IPSet
|
|
}
|
|
|
|
func MatchFromFilterRule(rule tailcfg.FilterRule) Match {
|
|
srcs := new(netipx.IPSetBuilder)
|
|
dests := new(netipx.IPSetBuilder)
|
|
|
|
for _, srcIP := range rule.SrcIPs {
|
|
set, _ := parseIPSet(srcIP, nil)
|
|
|
|
srcs.AddSet(set)
|
|
}
|
|
|
|
for _, dest := range rule.DstPorts {
|
|
set, _ := parseIPSet(dest.IP, nil)
|
|
|
|
dests.AddSet(set)
|
|
}
|
|
|
|
srcsSet, _ := srcs.IPSet()
|
|
destsSet, _ := dests.IPSet()
|
|
|
|
match := Match{
|
|
Srcs: srcsSet,
|
|
Dests: destsSet,
|
|
}
|
|
|
|
return match
|
|
}
|
|
|
|
func (m *Match) SrcsContainsIPs(ips []netip.Addr) bool {
|
|
for _, ip := range ips {
|
|
if m.Srcs.Contains(ip) {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func (m *Match) DestsContainsIP(ips []netip.Addr) bool {
|
|
for _, ip := range ips {
|
|
if m.Dests.Contains(ip) {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|