func (c *NatCommand) ExecSsh(m *state.Machine, script string) error {
host := instance.SelectPublicAddress(m.Addresses())
if host == "" {
return fmt.Errorf("could not resolve machine's public address")
}
log.Println("Configuring NAT routing on machine ", m.Id())
var options ssh.Options
cmd := ssh.Command("ubuntu@"+host, []string{"sh -c 'NATCMD=$(mktemp); cat >${NATCMD}; sudo sh -x ${NATCMD}'"}, &options)
cmd.Stdin = strings.NewReader(script)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func MatchNetworks(host, gateway *state.Machine) (string, string, error) {
var bestPrefix, bestHost, bestGw string
for _, hostAddr := range host.Addresses() {
if hostAddr.Type != instance.Ipv4Address || isLoopback(hostAddr.Value) {
continue
}
for _, gwAddr := range gateway.Addresses() {
if gwAddr.Type != instance.Ipv4Address || isLoopback(hostAddr.Value) {
continue
}
prefix := greatestCommonPrefix(hostAddr.Value, gwAddr.Value)
if len(prefix) > len(bestPrefix) {
bestPrefix = prefix
bestHost = hostAddr.Value
bestGw = gwAddr.Value
}
}
}
if bestHost != "" && bestGw != "" {
return bestHost, bestGw, nil
} else {
return "", "", fmt.Errorf("failed to find common network for %s and %s", host.Id(), gateway.Id())
}
}