90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
package vmware
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import (
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"errors"
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"io/ioutil"
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"log"
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"os"
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"regexp"
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"strings"
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"time"
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)
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// Interface to help find the IP address of a running virtual machine.
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type GuestIPFinder interface {
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GuestIP() (string, error)
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}
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// DHCPLeaseGuestLookup looks up the IP address of a guest using DHCP
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// lease information from the VMware network devices.
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type DHCPLeaseGuestLookup struct {
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// Driver that is being used (to find leases path)
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Driver Driver
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// Device that the guest is connected to.
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Device string
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// MAC address of the guest.
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MACAddress string
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}
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func (f *DHCPLeaseGuestLookup) GuestIP() (string, error) {
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dhcpLeasesPath := f.Driver.DhcpLeasesPath(f.Device)
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log.Printf("DHCP leases path: %s", dhcpLeasesPath)
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if dhcpLeasesPath == "" {
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return "", errors.New("no DHCP leases path found.")
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}
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fh, err := os.Open(dhcpLeasesPath)
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if err != nil {
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return "", err
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}
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defer fh.Close()
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dhcpBytes, err := ioutil.ReadAll(fh)
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if err != nil {
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return "", err
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}
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var lastIp string
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var lastLeaseEnd time.Time
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var curIp string
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var curLeaseEnd time.Time
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ipLineRe := regexp.MustCompile(`^lease (.+?) {$`)
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endTimeLineRe := regexp.MustCompile(`^\s*ends \d (.+?);$`)
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macLineRe := regexp.MustCompile(`^\s*hardware ethernet (.+?);$`)
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for _, line := range strings.Split(string(dhcpBytes), "\n") {
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// Need to trim off CR character when running in windows
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line = strings.TrimRight(line, "\r")
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matches := ipLineRe.FindStringSubmatch(line)
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if matches != nil {
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lastIp = matches[1]
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continue
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}
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matches = endTimeLineRe.FindStringSubmatch(line)
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if matches != nil {
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lastLeaseEnd, _ = time.Parse("2006/01/02 15:04:05", matches[1])
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continue
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}
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// If the mac address matches and this lease ends farther in the
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// future than the last match we might have, then choose it.
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matches = macLineRe.FindStringSubmatch(line)
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if matches != nil && matches[1] == f.MACAddress && curLeaseEnd.Before(lastLeaseEnd) {
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curIp = lastIp
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curLeaseEnd = lastLeaseEnd
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}
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}
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if curIp == "" {
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return "", errors.New("IP not found for MAC in DHCP leases")
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}
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return curIp, nil
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}
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