-
Notifications
You must be signed in to change notification settings - Fork 40
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #145 from mkumatag/dhcp
dhcp-sync: sync dhcp config with powervs network
- Loading branch information
Showing
4 changed files
with
305 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,203 @@ | ||
| // Copyright 2021 IBM Corp | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package dhcp | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io/ioutil" | ||
| "net" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/fsnotify/fsnotify" | ||
| "github.com/spf13/cobra" | ||
| "k8s.io/klog/v2" | ||
|
|
||
| "github.com/ppc64le-cloud/pvsadm/pkg" | ||
| "github.com/ppc64le-cloud/pvsadm/pkg/client" | ||
| "github.com/ppc64le-cloud/pvsadm/pkg/utils" | ||
|
|
||
| . "github.com/sayotte/iscdhcp" | ||
| ) | ||
|
|
||
| var ( | ||
| gateway, networkID, file, nameservers string | ||
| mutex = &sync.Mutex{} | ||
| ) | ||
|
|
||
| func ipv4MaskString(m []byte) string { | ||
| if len(m) != 4 { | ||
| panic("ipv4Mask: len must be 4 bytes") | ||
| } | ||
|
|
||
| return fmt.Sprintf("%d.%d.%d.%d", m[0], m[1], m[2], m[3]) | ||
| } | ||
|
|
||
| const dhcpdTemplate = ` | ||
| default-lease-time 600; | ||
| max-lease-time 7200; | ||
| ddns-update-style none; | ||
| authoritative; | ||
| %s | ||
| ` | ||
|
|
||
| func doEvery(d time.Duration, f func()) { | ||
| ticker := time.NewTicker(d) | ||
| defer ticker.Stop() | ||
| for ; true; <-ticker.C { | ||
| f() | ||
| } | ||
| } | ||
|
|
||
| type RoutersOption []net.IP | ||
|
|
||
| // IndentedString implements the method of the same name in the Statement interface | ||
| func (ro RoutersOption) IndentedString(prefix string) string { | ||
| s := prefix + "option routers " | ||
| for i := 0; i < len(ro)-1; i++ { | ||
| s += ro[i].String() + ", " | ||
| } | ||
| return s + ro[len(ro)-1].String() + ";\n" | ||
| } | ||
|
|
||
| func syncDHCPD() { | ||
| c, err := client.NewClientWithEnv(pkg.Options.APIKey, pkg.Options.Environment, false) | ||
| if err != nil { | ||
| klog.Fatalf("failed to create a session with IBM cloud: %v", err) | ||
| } | ||
|
|
||
| pvmclient, err := client.NewPVMClientWithEnv(c, pkg.Options.InstanceID, "", "prod") | ||
| if err != nil { | ||
| klog.Fatalf("failed to create a PVM client: %v", err) | ||
| } | ||
|
|
||
| n, err := pvmclient.NetworkClient.Get(networkID) | ||
|
|
||
| ipv4Addr, ipv4Net, err := net.ParseCIDR(*n.Cidr) | ||
| if err != nil { | ||
| klog.Fatalf("failed to ParseCIDR: %v", err) | ||
| } | ||
| subnetStmt := SubnetStatement{ | ||
| SubnetNumber: ipv4Addr, | ||
| Netmask: net.ParseIP(ipv4MaskString(ipv4Net.Mask)), | ||
| } | ||
|
|
||
| ports, err := pvmclient.NetworkClient.GetAllPort(networkID) | ||
| if err != nil { | ||
| klog.Fatalf("failed to get the ports: %v", err) | ||
| } | ||
|
|
||
| var g = n.Gateway | ||
|
|
||
| if gateway != "" { | ||
| g = gateway | ||
| } | ||
|
|
||
| router := RoutersOption{net.ParseIP(g)} | ||
| subnetStmt.Statements = append(subnetStmt.Statements, router) | ||
|
|
||
| nameserver := DomainNameServersOption{} | ||
| var nsList = n.DNSServers | ||
| if nameservers != "" { | ||
| nsList = strings.Split(nameservers, ",") | ||
| } | ||
|
|
||
| for _, ns := range nsList { | ||
| nameserver = append(nameserver, net.ParseIP(ns)) | ||
| } | ||
| subnetStmt.Statements = append(subnetStmt.Statements, nameserver) | ||
|
|
||
| for _, port := range ports.Ports { | ||
| hs := HostStatement{ | ||
| Hostname: "host" + strings.Split(*port.IPAddress, ".")[3], | ||
| } | ||
| hs.Statements = append(hs.Statements, HardwareStatement{HardwareType: "ethernet", HardwareAddress: *port.MacAddress}) | ||
| hs.Statements = append(hs.Statements, FixedAddressStatement{net.ParseIP(*port.IPAddress)}) | ||
| subnetStmt.Statements = append(subnetStmt.Statements, hs) | ||
| } | ||
|
|
||
| content := fmt.Sprintf(dhcpdTemplate, subnetStmt.IndentedString("")) | ||
| mutex.Lock() | ||
| ioutil.WriteFile(file, []byte(content), 0644) | ||
| mutex.Unlock() | ||
| } | ||
|
|
||
| var Cmd = &cobra.Command{ | ||
| Use: "dhcp-sync", | ||
| Short: "dhcp-sync command", | ||
| Long: `dhcp-sync tool is a tool populating the dhcpd.conf file from the PowerVS network and restart the dhcpd service.`, | ||
| PreRunE: func(cmd *cobra.Command, args []string) error { | ||
| if pkg.Options.InstanceID == "" { | ||
| return fmt.Errorf("--instance-id is required") | ||
| } | ||
| if pkg.Options.APIKey == "" { | ||
| return fmt.Errorf("api-key can't be empty, pass the token via --api-key or set IBMCLOUD_API_KEY environment variable") | ||
| } | ||
| return nil | ||
| }, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| go doEvery(2*time.Minute, syncDHCPD) | ||
|
|
||
| watcher, err := fsnotify.NewWatcher() | ||
| if err != nil { | ||
| klog.Fatal(err) | ||
| } | ||
| defer watcher.Close() | ||
|
|
||
| done := make(chan bool) | ||
| go func() { | ||
| for { | ||
| select { | ||
| case event, ok := <-watcher.Events: | ||
| if !ok { | ||
| return | ||
| } | ||
| klog.Info("event:", event) | ||
| if event.Op&fsnotify.Write == fsnotify.Write { | ||
| klog.Info("modified file:", event.Name) | ||
| klog.Info("restarting the dhcpd service") | ||
| exitcode, out, err := utils.RunCMD("systemctl", "restart", "dhcpd") | ||
| if exitcode != 0 { | ||
| klog.Errorf("failed to restart the dhcpd service, exitcode: %d, stdout: %s, err: %s", exitcode, out, err) | ||
| } | ||
| } | ||
| case err, ok := <-watcher.Errors: | ||
| if !ok { | ||
| return | ||
| } | ||
| klog.Error("error:", err) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| err = watcher.Add(file) | ||
| if err != nil { | ||
| klog.Fatal(err) | ||
| } | ||
| <-done | ||
| return nil | ||
| }, | ||
| } | ||
|
|
||
| func init() { | ||
| Cmd.Flags().StringVarP(&pkg.Options.InstanceID, "instance-id", "i", "", "Instance ID of the PowerVS instance") | ||
| Cmd.Flags().StringVar(&networkID, "network-id", "", "Network ID to be monitored") | ||
| Cmd.Flags().StringVar(&file, "file", "/etc/dhcp/dhcpd.conf", "DHCP conf file") | ||
| Cmd.Flags().StringVar(&gateway, "gateway", "", "Override the gateway value with") | ||
| Cmd.Flags().StringVar(&nameservers, "nameservers", "", "Override the DNS nameservers") | ||
| _ = Cmd.MarkFlagRequired("network-id") | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.