156 lines
3.2 KiB
Go
156 lines
3.2 KiB
Go
package initboot
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import (
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"bytes"
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"log"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"time"
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ping "github.com/sparrc/go-ping"
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"novit.nc/direktil/pkg/config"
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"novit.nc/direktil/inits/pkg/sys"
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"novit.nc/direktil/inits/pkg/vars"
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)
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var networkStarted = map[string]bool{}
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func setupNetworking() {
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cfg := sys.Config()
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for idx, network := range cfg.Networks {
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setupNetwork(idx, network)
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}
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}
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func setupNetwork(idx int, network config.NetworkDef) {
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tries := 0
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retry:
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ifaces, err := net.Interfaces()
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if err != nil {
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log.Fatalf("FATAL: failed to get network interfaces: %v", err)
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}
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match := false
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for _, iface := range ifaces {
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if networkStarted[iface.Name] {
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continue
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}
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if network.Match.Name != "" {
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if ok, err := filepath.Match(network.Match.Name, iface.Name); err != nil {
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log.Fatalf("FATAL: network[%d] name match error: %v", idx, err)
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} else if !ok {
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continue
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}
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}
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if network.Match.Ping != nil {
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log.Printf("network[%d] ping check on %s", idx, iface.Name)
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if ok, err := networkPingCheck(iface.Name, network); err != nil {
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log.Printf("ERROR: network[%d] ping check failed: %v", idx, err)
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} else if !ok {
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continue
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}
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}
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log.Printf("network[%d] matches interface %s", idx, iface.Name)
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match = true
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startNetwork(iface.Name, idx, network)
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if !network.Match.All {
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return
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}
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}
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if !match {
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log.Printf("WARNING: network[%d] did not match any interface", idx)
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tries++
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if network.Optional && tries > 3 {
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return
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}
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time.Sleep(1 * time.Second)
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log.Printf("WARNING: network[%d] retrying (try: %d)", idx, tries)
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goto retry
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}
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}
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func startNetwork(ifaceName string, idx int, network config.NetworkDef) {
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cfg := sys.Config()
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log.Printf("starting network[%d]", idx)
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script := vars.Substitute([]byte(network.Script), cfg)
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c := exec.Command("/bin/sh")
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c.Stdin = bytes.NewBuffer(script)
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c.Stdout = os.Stdout
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c.Stderr = os.Stderr
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// TODO doc
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c.Env = append(append(make([]string, 0), os.Environ()...), "IFNAME="+ifaceName)
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if err := c.Run(); err != nil {
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links, _ := exec.Command("ip", "link", "ls").CombinedOutput()
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log.Fatalf("FATAL: network setup failed (link list below): %v\n%s", err, string(links))
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}
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networkStarted[ifaceName] = true
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}
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func networkPingCheck(ifName string, network config.NetworkDef) (b bool, err error) {
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check := network.Match.Ping
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source := string(vars.Substitute([]byte(check.Source), sys.Config()))
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if err = sys.Run("ip", "addr", "add", source, "dev", ifName); err != nil {
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return
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}
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if err = sys.Run("ip", "link", "set", ifName, "up"); err != nil {
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return
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}
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defer func() {
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sys.MustRun("ip", "link", "set", ifName, "down")
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sys.MustRun("ip", "addr", "del", source, "dev", ifName)
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}()
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count := 3
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if check.Count != 0 {
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count = check.Count
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}
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for n := 0; n < count; n++ {
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// TODO probably better to use golang.org/x/net/icmp directly
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pinger, e := ping.NewPinger(network.Match.Ping.Target)
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if e != nil {
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err = e
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return
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}
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pinger.Count = 1
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pinger.Timeout = 1 * time.Second
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if check.Timeout > 0 {
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pinger.Timeout = time.Duration(check.Timeout) * time.Second
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}
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pinger.SetPrivileged(true)
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pinger.Run()
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if pinger.Statistics().PacketsRecv > 0 {
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b = true
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return
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}
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}
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return
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}
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