/
main.go
97 lines (90 loc) · 2.01 KB
/
main.go
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package main
import (
"flag"
"log"
"net"
"time"
"github.com/insomniacslk/dhcp/dhcpv4"
"github.com/insomniacslk/dhcp/dhcpv6"
"github.com/insomniacslk/dhcp/netboot"
)
var (
ver = flag.Int("v", 6, "IP version to use")
ifname = flag.String("i", "eth0", "Interface name")
dryrun = flag.Bool("dryrun", false, "Do not change network configuration")
debug = flag.Bool("d", false, "Print debug output")
)
func dhclient6(ifname string, verbose bool) (*netboot.NetConf, error) {
llAddr, err := dhcpv6.GetLinkLocalAddr(ifname)
if err != nil {
return nil, err
}
laddr := net.UDPAddr{
IP: llAddr,
Port: dhcpv6.DefaultClientPort,
Zone: ifname,
}
raddr := net.UDPAddr{
IP: dhcpv6.AllDHCPRelayAgentsAndServers,
Port: dhcpv6.DefaultServerPort,
Zone: ifname,
}
c := dhcpv6.NewClient()
c.LocalAddr = &laddr
c.RemoteAddr = &raddr
conv, err := c.Exchange(ifname, nil)
if verbose {
for _, m := range conv {
log.Print(m.Summary())
}
}
if err != nil {
return nil, err
}
// extract the network configuration
netconf, _, err := netboot.ConversationToNetconf(conv)
return netconf, err
}
func dhclient4(ifname string, verbose bool) (*netboot.NetConf, error) {
client := dhcpv4.NewClient()
conv, err := client.Exchange(ifname, nil)
if verbose {
for _, m := range conv {
log.Print(m.Summary())
}
}
if err != nil {
return nil, err
}
// extract the network configuration
netconf, _, err := netboot.ConversationToNetconfv4(conv)
return netconf, err
}
func main() {
flag.Parse()
var (
err error
netconf *netboot.NetConf
)
// bring interface up
_, err = netboot.IfUp(*ifname, 5*time.Second)
if err != nil {
log.Fatal(err)
}
if *ver == 6 {
netconf, err = dhclient6(*ifname, *debug)
} else {
netconf, err = dhclient4(*ifname, *debug)
}
if err != nil {
log.Fatal(err)
}
// configure the interface
if *debug {
log.Printf("Setting network configuration:")
log.Printf("%+v", netconf)
}
if err := netboot.ConfigureInterface(*ifname, netconf); err != nil {
log.Fatal(err)
}
}