//go:build linux || freebsd
// +build linux freebsd

package libpod

import (
	"github.com/containers/common/libnetwork/types"
	"github.com/containers/common/pkg/machine"
)

// convertPortMappings will remove the HostIP part from the ports when running inside podman machine.
// This is need because a HostIP of 127.0.0.1 would now allow the gvproxy forwarder to reach to open ports.
// For machine the HostIP must only be used by gvproxy and never in the VM.
func (c *Container) convertPortMappings() []types.PortMapping {
	if !machine.IsGvProxyBased() || len(c.config.PortMappings) == 0 {
		return c.config.PortMappings
	}
	// if we run in a machine VM we have to ignore the host IP part
	newPorts := make([]types.PortMapping, 0, len(c.config.PortMappings))
	for _, port := range c.config.PortMappings {
		port.HostIP = ""
		newPorts = append(newPorts, port)
	}
	return newPorts
}

func (c *Container) getNetworkOptions(networkOpts map[string]types.PerNetworkOptions) types.NetworkOptions {
	opts := types.NetworkOptions{
		ContainerID:   c.config.ID,
		ContainerName: getCNIPodName(c),
	}
	opts.PortMappings = c.convertPortMappings()

	// If the container requested special network options use this instead of the config.
	// This is the case for container restore or network reload.
	if c.perNetworkOpts != nil {
		opts.Networks = c.perNetworkOpts
	} else {
		opts.Networks = networkOpts
	}
	return opts
}

// setUpNetwork will set up the the networks, on error it will also tear down the cni
// networks. If rootless it will join/create the rootless network namespace.
func (r *Runtime) setUpNetwork(ns string, opts types.NetworkOptions) (map[string]types.StatusBlock, error) {
	rootlessNetNS, err := r.GetRootlessNetNs(true)
	if err != nil {
		return nil, err
	}
	var results map[string]types.StatusBlock
	setUpPod := func() error {
		results, err = r.network.Setup(ns, types.SetupOptions{NetworkOptions: opts})
		return err
	}
	// rootlessNetNS is nil if we are root
	if rootlessNetNS != nil {
		// execute the setup in the rootless net ns
		err = rootlessNetNS.Do(setUpPod)
		rootlessNetNS.Lock.Unlock()
	} else {
		err = setUpPod()
	}
	return results, err
}

// getCNIPodName return the pod name (hostname) used by CNI and the dnsname plugin.
// If we are in the pod network namespace use the pod name otherwise the container name
func getCNIPodName(c *Container) string {
	if c.config.NetMode.IsPod() || c.IsInfra() {
		pod, err := c.runtime.state.Pod(c.PodID())
		if err == nil {
			return pod.Name()
		}
	}
	return c.Name()
}