func getDynamicIP(t Netlink, link netlink.Link, endpoint *NetworkEndpoint) (client.Client, error) {
var ack *dhcp.Packet
var err error
// use dhcp to acquire address
dc, err := client.NewClient(link.Attrs().Index, link.Attrs().HardwareAddr)
if err != nil {
return nil, err
}
params := []byte{byte(dhcp4.OptionSubnetMask)}
if ip.IsUnspecifiedIP(endpoint.Network.Gateway.IP) {
params = append(params, byte(dhcp4.OptionRouter))
}
if len(endpoint.Network.Nameservers) == 0 {
params = append(params, byte(dhcp4.OptionDomainNameServer))
}
dc.SetParameterRequestList(params...)
err = dc.Request()
if err != nil {
log.Errorf("error sending dhcp request: %s", err)
return nil, err
}
ack = dc.LastAck()
if ack.YourIP() == nil || ack.SubnetMask() == nil {
err = fmt.Errorf("dhcp assigned nil ip or subnet mask")
log.Error(err)
return nil, err
}
log.Infof("DHCP response: IP=%s, SubnetMask=%s, Gateway=%s, DNS=%s, Lease Time=%s", ack.YourIP(), ack.SubnetMask(), ack.Gateway(), ack.DNS(), ack.LeaseTime())
defer func() {
if err != nil && ack != nil {
dc.Release()
}
}()
return dc, nil
}
func (t *BaseOperations) Setup(config Config) error {
c, err := client.NewClient()
if err != nil {
return err
}
h := etcconf.NewHosts(hostsFile)
if err = h.Load(); err != nil {
return err
}
// make sure localhost entries are present
entries := []struct {
hostname string
addr net.IP
}{
{"localhost", net.ParseIP("127.0.0.1")},
{"ip6-localhost", net.ParseIP("::1")},
{"ip6-loopback", net.ParseIP("::1")},
{"ip6-localnet", net.ParseIP("fe00::0")},
{"ip6-mcastprefix", net.ParseIP("ff00::0")},
{"ip6-allnodes", net.ParseIP("ff02::1")},
{"ip6-allrouters", net.ParseIP("ff02::2")},
}
for _, e := range entries {
h.SetHost(e.hostname, e.addr)
}
if err = h.Save(); err != nil {
return err
}
// start with empty resolv.conf
os.Remove(resolvFile)
rc := etcconf.NewResolvConf(resolvFile)
t.dynEndpoints = make(map[string][]*NetworkEndpoint)
t.dhcpLoops = make(map[string]chan bool)
t.dhcpClient = c
t.hosts = h
t.resolvConf = rc
t.config = config
// support the df command (#1642)
if err = os.Symlink("/proc/mounts", "/etc/mtab"); err != nil {
return err
}
mounted, err := mount.Mounted(runMountPoint)
if err != nil {
return err
}
if mounted {
// unmount /run - https://github.com/vmware/vic/issues/1643
if err := syscall.Unmount(runMountPoint, syscall.MNT_DETACH); err != nil {
return fmt.Errorf("unmount %s failed with %q", runMountPoint, err)
}
}
return nil
}