57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package common
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import (
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"bytes"
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"errors"
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"os"
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"os/exec"
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"regexp"
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)
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// IfconfigIPFinder finds the host IP based on the output of `ifconfig`.
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type IfconfigIPFinder struct {
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Devices []string
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}
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// HostIP returns the host's IP address or an error if it could not be found
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// from the `ifconfig` output.
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func (f *IfconfigIPFinder) HostIP() (string, error) {
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var ifconfigPath string
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// On some systems, ifconfig is in /sbin which is generally not
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// on the PATH for a standard user, so we just check that first.
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if _, err := os.Stat("/sbin/ifconfig"); err == nil {
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ifconfigPath = "/sbin/ifconfig"
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}
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if ifconfigPath == "" {
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var err error
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ifconfigPath, err = exec.LookPath("ifconfig")
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if err != nil {
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return "", err
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}
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}
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for _, device := range f.Devices {
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stdout := new(bytes.Buffer)
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cmd := exec.Command(ifconfigPath, device)
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// Force LANG=C so that the output is what we expect it to be
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// despite the locale.
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cmd.Env = append(cmd.Env, "LANG=C")
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cmd.Env = append(cmd.Env, os.Environ()...)
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cmd.Stdout = stdout
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cmd.Stderr = new(bytes.Buffer)
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if err := cmd.Run(); err == nil {
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re := regexp.MustCompile(`inet\s+(?:addr:)?(.+?)\s`)
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matches := re.FindStringSubmatch(stdout.String())
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if matches != nil {
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return matches[1], nil
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}
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}
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}
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return "", errors.New("IP not found in ifconfig output")
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}
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