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Log all the available interfaces when none were found #940

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Feb 2, 2018
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Log all the available interfaces when none were found #940

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8 changes: 7 additions & 1 deletion main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -474,7 +474,13 @@ func LookupExtIface(ifname string, ifregex string) (*backend.ExternalInterface,

// Check that nothing was matched
if iface == nil {
return nil, fmt.Errorf("Could not match pattern %s to any of the available network interfaces", ifregex)
var availableFaces []string
for _, f := range ifaces {
ip, _ := ip.GetIfaceIP4Addr(&f) // We can safely ignore errors. We just won't log any ip
availableFaces = append(availableFaces, fmt.Sprintf("%s:%s", f.Name, ip))
}

return nil, fmt.Errorf("Could not match pattern %s to any of the available network interfaces (%s)", ifregex, strings.Join(availableFaces, ", "))
}
} else {
log.Info("Determining IP address of default interface")
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