mirror of
https://github.com/juanfont/headscale.git
synced 2024-12-25 05:35:52 -05:00
Rework getAvailableIp
This commit reworks getAvailableIp with a "simpler" version that will look for the first available IP address in our IP Prefix. There is a couple of ideas behind this: * Make the host IPs reasonably predictable and in within similar subnets, which should simplify ACLs for subnets * The code is not random, but deterministic so we can have tests * The code is a bit more understandable (no bit shift magic)
This commit is contained in:
Kristoffer Dalby
parent
309f868a21
commit
b5841c8a8b
@ -38,7 +38,7 @@ func (s *Suite) ResetDB(c *check.C) {
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c.Fatal(err)
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}
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cfg := Config{
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IPPrefix: netaddr.MustParseIPPrefix("127.0.0.1/32"),
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IPPrefix: netaddr.MustParseIPPrefix("10.27.0.0/23"),
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}
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h = Headscale{
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@ -15,6 +15,7 @@ func (s *Suite) TestRegisterMachine(c *check.C) {
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DiscoKey: "faa",
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Name: "testmachine",
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NamespaceID: n.ID,
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IPAddress: "10.0.0.1",
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}
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h.db.Save(&m)
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103
utils.go
103
utils.go
@ -7,18 +7,11 @@ package headscale
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import (
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"crypto/rand"
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"encoding/binary"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net"
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"time"
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mathrand "math/rand"
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"golang.org/x/crypto/nacl/box"
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"gorm.io/gorm"
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"inet.af/netaddr"
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"tailscale.com/types/wgkey"
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)
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@ -78,47 +71,73 @@ func encodeMsg(b []byte, pubKey *wgkey.Key, privKey *wgkey.Private) ([]byte, err
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return msg, nil
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}
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func (h *Headscale) getAvailableIP() (*net.IP, error) {
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i := 0
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for {
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ip, err := getRandomIP(h.cfg.IPPrefix)
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func (h *Headscale) getAvailableIP() (*netaddr.IP, error) {
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ipPrefix := h.cfg.IPPrefix
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usedIps, err := h.getUsedIPs()
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if err != nil {
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return nil, err
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}
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m := Machine{}
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if result := h.db.First(&m, "ip_address = ?", ip.String()); errors.Is(result.Error, gorm.ErrRecordNotFound) {
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return ip, nil
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}
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i++
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if i == 100 { // really random number
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break
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}
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}
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return nil, errors.New(fmt.Sprintf("Could not find an available IP address in %s", h.cfg.IPPrefix.String()))
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}
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func getRandomIP(ipPrefix netaddr.IPPrefix) (*net.IP, error) {
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mathrand.Seed(time.Now().Unix())
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ipo, ipnet, err := net.ParseCIDR(ipPrefix.String())
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if err == nil {
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ip := ipo.To4()
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// fmt.Println("In Randomize IPAddr: IP ", ip, " IPNET: ", ipnet)
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// fmt.Println("Final address is ", ip)
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// fmt.Println("Broadcast address is ", ipb)
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// fmt.Println("Network address is ", ipn)
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r := mathrand.Uint32()
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ipRaw := make([]byte, 4)
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binary.LittleEndian.PutUint32(ipRaw, r)
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// ipRaw[3] = 254
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// fmt.Println("ipRaw is ", ipRaw)
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for i, v := range ipRaw {
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// fmt.Println("IP Before: ", ip[i], " v is ", v, " Mask is: ", ipnet.Mask[i])
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ip[i] = ip[i] + (v &^ ipnet.Mask[i])
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// fmt.Println("IP After: ", ip[i])
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// for _, ip := range usedIps {
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// nextIP := ip.Next()
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// if !containsIPs(usedIps, nextIP) && ipPrefix.Contains(nextIP) {
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// return &nextIP, nil
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// }
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// }
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// // If there are no IPs in use, we are starting fresh and
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// // can issue IPs from the beginning of the prefix.
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// ip := ipPrefix.IP()
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// return &ip, nil
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// return nil, fmt.Errorf("failed to find any available IP in %s", ipPrefix)
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// Get the first IP in our prefix
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ip := ipPrefix.IP()
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for {
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if !ipPrefix.Contains(ip) {
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return nil, fmt.Errorf("could not find any suitable IP in %s", ipPrefix)
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}
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// fmt.Println("FINAL IP: ", ip.String())
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if ip.IsZero() &&
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ip.IsLoopback() {
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continue
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}
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if !containsIPs(usedIps, ip) {
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return &ip, nil
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}
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return nil, err
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ip = ip.Next()
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}
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}
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func (h *Headscale) getUsedIPs() ([]netaddr.IP, error) {
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var addresses []string
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h.db.Model(&Machine{}).Pluck("ip_address", &addresses)
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ips := make([]netaddr.IP, len(addresses))
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for index, addr := range addresses {
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ip, err := netaddr.ParseIP(addr)
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if err != nil {
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return nil, fmt.Errorf("failed to parse ip from database, %w", err)
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}
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ips[index] = ip
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}
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return ips, nil
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}
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func containsIPs(ips []netaddr.IP, ip netaddr.IP) bool {
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for _, v := range ips {
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if v == ip {
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return true
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}
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}
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return false
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}
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105
utils_test.go
Normal file
105
utils_test.go
Normal file
@ -0,0 +1,105 @@
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package headscale
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import (
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"gopkg.in/check.v1"
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"inet.af/netaddr"
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)
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func (s *Suite) TestGetAvailableIp(c *check.C) {
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ip, err := h.getAvailableIP()
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c.Assert(err, check.IsNil)
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expected := netaddr.MustParseIP("10.27.0.0")
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c.Assert(ip.String(), check.Equals, expected.String())
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}
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func (s *Suite) TestGetUsedIps(c *check.C) {
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ip, err := h.getAvailableIP()
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c.Assert(err, check.IsNil)
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n, err := h.CreateNamespace("test_ip")
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c.Assert(err, check.IsNil)
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pak, err := h.CreatePreAuthKey(n.Name, false, false, nil)
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c.Assert(err, check.IsNil)
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_, err = h.GetMachine("test", "testmachine")
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c.Assert(err, check.NotNil)
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m := Machine{
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ID: 0,
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MachineKey: "foo",
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NodeKey: "bar",
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DiscoKey: "faa",
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Name: "testmachine",
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NamespaceID: n.ID,
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Registered: true,
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RegisterMethod: "authKey",
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AuthKeyID: uint(pak.ID),
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IPAddress: ip.String(),
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}
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h.db.Save(&m)
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ips, err := h.getUsedIPs()
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c.Assert(err, check.IsNil)
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expected := netaddr.MustParseIP("10.27.0.0")
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c.Assert(ips[0], check.Equals, expected)
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}
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func (s *Suite) TestGetMultiIp(c *check.C) {
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n, err := h.CreateNamespace("test-ip-multi")
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c.Assert(err, check.IsNil)
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for i := 1; i <= 350; i++ {
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ip, err := h.getAvailableIP()
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c.Assert(err, check.IsNil)
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pak, err := h.CreatePreAuthKey(n.Name, false, false, nil)
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c.Assert(err, check.IsNil)
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_, err = h.GetMachine("test", "testmachine")
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c.Assert(err, check.NotNil)
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m := Machine{
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ID: 0,
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MachineKey: "foo",
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NodeKey: "bar",
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DiscoKey: "faa",
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Name: "testmachine",
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NamespaceID: n.ID,
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Registered: true,
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RegisterMethod: "authKey",
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AuthKeyID: uint(pak.ID),
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IPAddress: ip.String(),
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}
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h.db.Save(&m)
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}
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ips, err := h.getUsedIPs()
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c.Assert(err, check.IsNil)
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c.Assert(len(ips), check.Equals, 350)
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c.Assert(ips[0], check.Equals, netaddr.MustParseIP("10.27.0.0"))
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c.Assert(ips[9], check.Equals, netaddr.MustParseIP("10.27.0.9"))
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c.Assert(ips[300], check.Equals, netaddr.MustParseIP("10.27.1.44"))
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expectedNextIP := netaddr.MustParseIP("10.27.1.94")
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nextIP, err := h.getAvailableIP()
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c.Assert(err, check.IsNil)
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c.Assert(nextIP.String(), check.Equals, expectedNextIP.String())
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// If we call get Available again, we should receive
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// the same IP, as it has not been reserved.
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nextIP2, err := h.getAvailableIP()
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c.Assert(err, check.IsNil)
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c.Assert(nextIP2.String(), check.Equals, expectedNextIP.String())
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}
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