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// Package vmdriver implements a u-root/pkg/qemu.Device for networking.
package vmdriver
import (
"fmt"
"net"
"github.com/hugelgupf/vmtest/qemu"
)
// HostNetwork provides QEMU user-mode networking to the host.
//
// Net must be an IPv4 network.
func HostNetwork(net *net.IPNet) qemu.Fn {
return func(alloc *qemu.IDAllocator, opts *qemu.Options) error {
if net.IP.To4() == nil {
return fmt.Errorf("HostNetwork must be configured with an IPv4 address")
}
netdevID := alloc.ID("netdev")
opts.AppendQEMU(
"-device", fmt.Sprintf("e1000,netdev=%s", netdevID),
"-netdev", fmt.Sprintf("user,id=%s,net=%s,dhcpstart=%s", netdevID, net, nthIP(net, 8)),
)
return nil
}
}
func inc(ip net.IP) {
for j := len(ip) - 1; j >= 0; j-- {
ip[j]++
if ip[j] > 0 {
break
}
}
}
func nthIP(nt *net.IPNet, n int) net.IP {
ip := make(net.IP, net.IPv4len)
copy(ip, nt.IP.To4())
for i := 0; i < n; i++ {
inc(ip)
}
if !nt.Contains(ip) {
return nil
}
return ip
}
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