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// NetworkModel is used to declaratively describe the intended state of the networking
// around EVE VM(s) for the testing purposes. The model is submitted in the JSON format
// to Eden-SDN Agent, running inside a separate VM, connected to EVE VM(s) via inter-VM
// network interfaces, and emulating the desired networking using the Linux network stack,
// network namespaces, netfilter and with the help of several open-source projects,
// such as dnsmasq, radvd, goproxy, etc.
type NetworkModel struct {
    // Ports : network interfaces connecting EVE VM(s) with Eden-SDN VM.
    // Each port is essentially an interconnected pair of network interfaces, with one side
    // inserted into the EVE VM and the other to Eden-SDN. These interface pairs are created
    // in both VMs in the order as listed here. This means that Ports[0] will appear
    // as the first interface in EVE (likely named "eth0" by the kernel) and likewise
    // as the first interface in Eden-SDN. Note that Eden-SDN will have one more extra
    // interface, added as last and used for management (for eden to talk to SDN mgmt agent).
    Ports []Port `json:"ports"`
    // Bonds are aggregating multiple ports for load-sharing and redundancy purposes.
    Bonds []Bond `json:"bonds"`
    // Bridges provide L2 connectivity.
    Bridges []Bridge `json:"bridges"`
    // Networks provide L3 connectivity.
    Networks []Network `json:"networks"`
    // Endpoints simulate "remote" clients and servers.
    Endpoints Endpoints `json:"endpoints"`
    // Firewall is applied between Networks, Endpoints and the outside of Eden-SDN
    // (controller, Internet).
    Firewall Firewall `json:"firewall"`
    // Host configuration that Eden-SDN is informed about.
    // Eden SDN needs to learn about the host configuration to properly route traffic
    // to the controller and beyond to the Internet.
    // If not defined (nil pointer), Eden will try to detect host config automatically.
    Host *HostConfig `json:"host,omitempty"`
}

// Port is a network interface connecting EVE VM with Eden-SDN VM.
type Port struct {
    // LogicalLabel : logical name used for reference.
    LogicalLabel string `json:"logicalLabel"`
    // MAC address assigned to the interface on the SDN side.
    // If not specified by the user, Eden will generate a random MAC address.
    MAC string `json:"mac"`
    // MTU : Maximum transmission unit (for the SDN side).
    MTU uint16 `json:"mtu"`
    // AdminUP : whether the interface should be UP on the SDN side.
    // Put down to test link-down scenarios on EVE.
    AdminUP bool `json:"adminUP"`
    // EVEConnect : plug the other side of the port into a given EVE instance.
    EVEConnect EVEConnect `json:"eveConnect"`
}

// EVEConnect : connects Port to a given EVE instance.
type EVEConnect struct {
    // EVEInstance : name of the EVE instance to which a given port is connected.
    // In the future, Eden may support running multiple EVE instances connected
    // to the same SDN and controller. It is likely that each such instance
    // will be assigned a unique logical label, which this field will reference.
    // However, currently Eden is only able to manage a single EVE instance.
    // For the time being it is therefore expected that this field is empty
    // and EVEConnect refers to the one and only EVE instance.
    EVEInstance string `json:"eveInstance"`
    // MAC address assigned to the interface on the EVE side.
    // If not specified by the user, Eden will generate a random MAC address.
    MAC string `json:"mac"`
}

// Bridge provides L2 connectivity Bond is aggregating multiple ports for load-sharing and redundancy purposes.
// Also known as Link aggregation group (LAG).
type BridgeBond struct {
    	// LogicalLabel : logical name used for reference.
    	LogicalLabel string `json:"logicalLabel"`
    	// Ports Logical: labelslist of aggregated ports.
, referenced by logical labels.
	Ports []string `json:"ports"`
    	// LogicalMode labels: ofbonding bondspolicy.
    Bonds []string	Mode BondMode `json:"bondsmode"`
}

	// NetworkLacpRate provides: L3 connectivity.
type Network struct {
    LACPDU packets transmission rate.
	// LogicalLabelApplicable :for logical name used for referenceBondMode802Dot3AD only.
    LogicalLabel string	LacpRate LacpRate `json:"logicalLabellacpRate"`
	// MIIMonitor : MII link state monitoring.
	// LogicalLink labelmonitoring ofis aeither disabled Bridgeor toone whichof the networkmonitors
	// is attached.
    Bridge string enabled (MII or ARP), never both at the same time.
	MIIMonitor BondMIIMonitor `json:"bridgemiiMonitor"`
	// ARPMonitor : ARP-based link state monitoring.
	// Link Leavemonitoring zerois valueeither todisabled expressor intentone of not using VLAN for this network.
    VlanID uint16the monitors
	// is enabled (MII or ARP), never both at the same time.
	ARPMonitor BondArpMonitor `json:"vlanIDarpMonitor"`
}

// BondMIIMonitor : MII link monitoring parameters.
type BondMIIMonitor struct {
	// SubnetEnabled : networkset addressto +true netmaskto (IPv4 or IPv6)enable MII.
    Subnet string	Enabled bool `json:"subnetenabled"`
	// Interval specifies the //MII GwIPlink shouldmonitoring befrequency insidein the Subnetmilliseconds.
	// This determines  GwIP string `json:"gwIP"`
    // DHCP configuration.
    DHCP DHCPhow often the link state of each bond slave is inspected
	// for link failures.
	Interval uint32 `json:"dhcpinterval"`
	// UpDelay specifies the //time, TransparentProxyin ismilliseconds, ato proxywait that both HTTP and HTTPS traffic is forwarded through
    // transparently, before it reaches router, endpoints, firewall, etc.
    TransparentProxy *Proxy `json:"transparentProxy,omitempty"`
    // Router configuration. Every network has a separate routing context.
    // Undefined (nil) means that everything should be routed and accessible.
    // That includes all networks, endpoints and the outside of Eden SDN.
    Router *Router `json:"router,omitempty"`
}

// DHCP configuration.
// Note that for IPv6 we prefer to use Router Advertisement over DHCPv6 to publish
// all this information to hosts on the network.
// But DHCPv6 is still needed and used to convey NTP and netboot configuration (if provided).
type DHCP struct {
    // Enable DHCP. Set to false to use EVE with static IP addressing.
    Enable bool `json:"enable"`
    // IPRange : a range of IP addresses to allocate from.
    // Not applicable for IPv6.
    IPRange IPRange `json:"ipRange"`
    // DomainName : name of the domain assigned to the network.
    // It is propagated to clients using the DHCP option 15 (24 in DHCPv6).
    DomainName string `json:"domainName"`
    // DNSClientConfig : DNS configuration passed to clients via DHCP.
    DNSClientConfig
    // Public NTP server to announce via DHCP option 42 (56 in DHCPv6).
    // Do not configure both PublicNTP and PrivateNTP.
    PublicNTP string `json:"publicNTP"`
    // Logical label of an NTP endpoint running inside Eden SDN, announced to client
    // via DHCP option 42 (56 in DHCPv6).
    // Do not configure both PublicNTP and PrivateNTP.
    PrivateNTP string `json:"privateNTP"`
    // WPAD : URL with a location of a PAC file, announced using the Web Proxy Auto-Discovery
    // Protocol (WPAD) and DHCP.
    // The PAC file should contain a javascript that the client will use to determine
    // which proxy to use for a given request.
    // URL example: http://wpad.example.com/wpad.dat
    // The client will learn the PAC file location using the DHCP option 252.
    // An alternative approach is to use DNS (with a DNSServer endpoint).
    WPAD string `json:"wpadbefore enabling
	// a bond slave after a link recovery has been detected.
	// The UpDelay value should be a multiple of the monitoring interval; if not,
	// it will be rounded down to the nearest multiple.
	// The default value is 0.
	UpDelay uint32 `json:"upDelay"`
	// DownDelay specifies the time, in milliseconds, to wait before disabling a bond
	// slave after a link failure has been detected.
	// The DownDelay value should be a multiple of the monitoring interval; if not,
	// it will be rounded down to the nearest multiple.
	// The default value is 0.
	DownDelay uint32 `json:"downDelay"`
}

// BondArpMonitor : ARP-based link monitoring parameters.
type BondArpMonitor struct {
	// Enabled : set to true to enable ARP-based link monitoring.
	Enabled bool `json:"enabled"`
	// Interval specifies the ARP link monitoring frequency in milliseconds.
	Interval uint32 `json:"interval"`
	// IPTargets specifies the IPv4 addresses to use as ARP monitoring peers.
	// These are the targets of ARP requests sent to determine the health of links.
	IPTargets []string `json:"ipTargets"`
}

// LacpRate specifies the rate in which bond driver will ask LACP link partners
// to transmit LACPDU packets in 802.3ad mode.
type LacpRate uint8

const (
	// LacpRateSlow : Request partner to transmit LACPDUs every 30 seconds.
	// This is the default rate.
	LacpRateSlow LacpRate = iota
	// LacpRateFast : Request partner to transmit LACPDUs every 1 second.
	LacpRateFast
)

// BondMode specifies the policy indicating how bonding slaves are used
// during network transmissions.
type BondMode uint8

const (
	// BondModeBalanceRR : Round-Robin
	// This is the default mode.
	BondModeBalanceRR BondMode = iota
	// BondModeActiveBackup : Active/Backup
	BondModeActiveBackup
	// BondModeBalanceXOR : select slave for a packet using a hash function
	BondModeBalanceXOR
	// BondModeBroadcast : send every packet on all slaves
	BondModeBroadcast
	// BondMode802Dot3AD : IEEE 802.3ad Dynamic link aggregation
	BondMode802Dot3AD
	// BondModeBalanceTLB : Adaptive transmit load balancing
	BondModeBalanceTLB
	// BondModeBalanceALB : Adaptive load balancing
	BondModeBalanceALB
)

// Bridge provides L2 connectivity.
type Bridge struct {
    // LogicalLabel : logical name used for reference.
    LogicalLabel string `json:"logicalLabel"`
    // Logical labels of ports.
    Ports []string `json:"ports"`
    // Logical labels of bonds.
    Bonds []string `json:"bonds"`
}

// Network provides L3 connectivity.
type Network struct {
    // LogicalLabel : logical name used for reference.
    LogicalLabel string `json:"logicalLabel"`
    // Logical label of a Bridge to which the network is attached.
    Bridge string `json:"bridge"`
    // Leave zero NetbootServervalue :to Logicalexpress labelintent of anot NetbootServerusing endpointVLAN which the client should usefor this network.
    VlanID uint16 `json:"vlanID"`
    // toSubnet boot: EVEnetwork OSaddress from.+ The IP addressnetmask (IPv4 or FQDNIPv6).
 and the provisioning fileSubnet (iPXE script)string `json:"subnet"`
    // locationGwIP willshould be announced toinside the client using DHCP options 66 and 67 (59 in DHCPv6).Subnet.
    GwIP string `json:"gwIP"`
    // Eden-SDN will announce either IP address or FQDN depending on whether any of the
    // assigned private DNS servers is able to resolve the NetbootServer domain nameDHCP configuration.
    DHCP DHCP `json:"dhcp"`
    // TransparentProxy is a proxy that both HTTP and HTTPS traffic is forwarded through
    // transparently, before it reaches router, endpoints, firewall, etc.
    NetbootServerTransparentProxy string*Proxy `json:"netbootServertransparentProxy,omitempty"`
}

// DNSClientConfig : DNS configuration for// Router configuration. Every network has a client.
type DNSClientConfig struct {separate routing context.
    // PublicDNS : list of IP addresses of public DNS servers to announce via DHCP option 6.
    // For example: ["1.1.1.1", "8.8.8.8"]Undefined (nil) means that everything should be routed and accessible.
    // That includes all networks, endpoints and the outside of Eden SDN.
    PublicDNS []stringRouter *Router `json:"publicDNSrouter,omitempty"`
}

// DHCP   configuration.
// PrivateDNSNote :that listfor ofIPv6 DNSwe serversprefer runningto asuse endpointsRouter insideAdvertisement Edenover SDN,
DHCPv6 to publish
// all //this announcedinformation to clientshosts viaon DHCPthe option 6network.
// But DHCPv6 is //still Theneeded listand shouldused containto logicalconvey labelsNTP ofand thosenetboot endpoints,configuration not IP addresses!
    PrivateDNS []string `json:"privateDNS"`
}

// Proxy can be either transparent or configured explicitly.
type Proxy struct {(if provided).
type DHCP struct {
    // Enable DHCP. Set to false to use EVE with static IP addressing.
    Enable bool `json:"enable"`
    // CertPEMIPRange : Proxya certificaterange of theIP certificateaddresses authorityto in the PEM formatallocate from.
    // ProxyNot willapplicable usefor CAIPv6.
 cert to sign certificateIPRange that it generates for itself.
    // EVE should be configured to trust CA certificateIPRange `json:"ipRange"`
    // DomainName : name of the domain assigned to the network.
    // It Notis neededpropagated ifto proxyclients isusing justthe forwardingDHCP alloption flows15 (i.e. not terminating TLS24 in DHCPv6).
    CACertPEMDomainName string `json:"caCertPEMdomainName"`
    // CAKeyPEMDNSClientConfig : DNS Proxyconfiguration keypassed ofto theclients certificatevia authorityDHCP.
 in the PEM format.DNSClientConfig
    // ProxyPublic willNTP use CAserver cert to signannounce certificatevia thatDHCP itoption generates42 for itself.
    // EVE should be configured to trust CA certificate(56 in DHCPv6).
    // NotDo needednot ifconfigure proxyboth isPublicNTP just forwarding all flows (i.e. not terminating TLS)and PrivateNTP.
    CAKeyPEMPublicNTP string `json:"caKeyPEMpublicNTP"`
    // ProxyRulesLogical :label aof setan ofNTP rulesendpoint thatrunning decidesinside whatEden toSDN, doannounced with proxied traffic.to client
    // via ByDHCP option default42 (no56 rulesin defined), proxy will just forward all the flowsDHCPv6).
    // Do not configure both PublicNTP and PrivateNTP.
    ProxyRulesPrivateNTP []ProxyRulestring `json:"proxyRulesprivateNTP"`
}

    // ProxyRuleWPAD : ruleURL used bywith a proxy, which, if matcheslocation of a givenPAC flowfile, decides what
announced using the Web Proxy Auto-Discovery
    // toProtocol do(WPAD) withand it.
type ProxyRule struct {DHCP.
    // ReqHostThe :PAC hostfile fromshould HTTPcontain requesta header (or fromjavascript that the SNIclient valuewill inuse the TLS ClientHello)to determine
    // which proxy to matchuse thisfor rulea with (e.g. "google.com")given request.
    // EmptyURL ReqHost should be used with the default rule (put one at most).
    ReqHost string `json:"reqHost"`example: http://wpad.example.com/wpad.dat
    // The client will learn the PAC file location using the DHCP option 252.
    // Action to take An alternative approach is to use DNS (with a DNSServer endpoint).
    ActionWPAD ProxyActionstring `json:"actionwpad"`
}

    // RouterNetbootServer routing: trafficLogical forlabel aof a networkNetbootServer basedendpoint onwhich the reachability requirements.
type Router struct {client should use
    // to OutsideReachabilityboot :EVE IfOS enabledfrom. thenThe itIP isaddress possibleor toFQDN useand the provisioning networkfile to(iPXE accessscript)
    // endpoints outside of Eden SDN (unless blocked by firewall location will be announced to the client using DHCP options 66 and 67 (59 in DHCPv6).
    // ThisEden-SDN includeswill the controller (Adam, zedcloud), eserver (image cache) and the Internet.announce either IP address or FQDN depending on whether any of the
    OutsideReachability// bool `json:"outsideReachability"`
    // ReachableEndpoints : Logical labels of reachable endpointsassigned private DNS servers is able to resolve the NetbootServer domain name.
    ReachableEndpointsNetbootServer []string `json:"reachableEndpointsnetbootServer"`
    
}

// ReachableNetworksDNSClientConfig : LogicalDNS labelsconfiguration offor reachablea networksclient.
type DNSClientConfig struct {
  ReachableNetworks []string `json:"reachableNetworks"`
}

// Note that traffic not matched by any rule is allowed!
type Firewall struct { PublicDNS : list of IP addresses of public DNS servers to announce via DHCP option 6.
    // RulesFor example: firewall rules applied in the order as configured.["1.1.1.1", "8.8.8.8"]
    RulesPublicDNS []FwRulestring `json:"rulespublicDNS"`
}

// FwRule : a firewall rule.
type FwRule struct {
    // SrcSubnet : subnet to match the source IP address with.
    SrcSubnet string `json:"srcSubnet"`// PrivateDNS : list of DNS servers running as endpoints inside Eden SDN,
    // announced to clients via DHCP option 6.
    // DstSubnet : subnet to match the destination IP address with. The list should contain logical labels of those endpoints, not IP addresses!
    DstSubnetPrivateDNS []string `json:"dstSubnetprivateDNS"`
}

// Proxy can be //either Protocoltransparent :or filterconfigured by protocolexplicitly.
type Proxy   Protocol FwProto `json:"protocol"`struct {
    // PortsCertPEM : Proxy listcertificate of destinationthe portcertificate toauthority whichin the rulePEM appliesformat.
    // Empty = any.
    Ports []uint16 `json:"ports"`Proxy will use CA cert to sign certificate that it generates for itself.
    // Action EVE should be configured to trust CA takecertificate.
    Action// FwAction `json:"action"`
}

// HostConfig : host configuration that Eden-SDN needs to be informed about.
type HostConfig struct {Not needed if proxy is just forwarding all flows (i.e. not terminating TLS).
    CACertPEM string `json:"caCertPEM"`
    // HostIPsCAKeyPEM : Proxy listkey of IPthe addressescertificate usedauthority byin the host system (on top of whichPEM format.
    // Eden runs).
    // Eden SDN requires at least one routable host IP addressProxy will use CA cert to sign certificate that it generates for itself.
    HostIPs []string `json:"hostIPs"`
    // NetworkTypeEVE :should whichbe IPconfigured versionsto aretrust used by the hostCA certificate.
    // Not Evenneeded if hostproxy usesis IPv4just only,forwarding itall is still possible to have IPv6 inside
    // Eden-SDN. Connectivity between EVE (IPv6) and the controller (IPv4) is established
    // automatically using DNS64 and NAT64. However, the opposite case (from IPv4 to IPv6)
    // is not supported. In other words, to test EVE with IPv4, it is required for the host
    // to use IPv4 (single or dual stack).
    NetworkType NetworkType `json:"networkTypeflows (i.e. not terminating TLS).
    CAKeyPEM string `json:"caKeyPEM"`
    // ProxyRules : a set of rules that decides what to do with proxied traffic.
    // By default (no rules defined), proxy will just forward all the flows.
    ProxyRules []ProxyRule `json:"proxyRules"`
}

// ProxyRule : rule used by a proxy, which, if matches a given flow, decides what
// to do with it.
type ProxyRule struct {
    // ReqHost : host from HTTP request header (or from the SNI value in the TLS ClientHello)
    // to match this rule with (e.g. "google.com").
    // Empty ReqHost should be used with the default rule (put one at most).
    ReqHost string `json:"reqHost"`
    // Action to take.
    Action ProxyAction `json:"action"`
}

// Router routing traffic for a network based on the reachability requirements.
type Router struct {
    // OutsideReachability : If enabled then it is possible to use the network to access
    // endpoints outside of Eden SDN (unless blocked by firewall).
    // This includes the controller (Adam, zedcloud), eserver (image cache) and the Internet.
    OutsideReachability bool `json:"outsideReachability"`
    // ReachableEndpoints : Logical labels of reachable endpoints.
    ReachableEndpoints []string `json:"reachableEndpoints"`
    // ReachableNetworks : Logical labels of reachable networks.
    ReachableNetworks []string `json:"reachableNetworks"`
}

// Note that traffic not matched by any rule is allowed!
type Firewall struct {
    // Rules : firewall rules applied in the order as configured.
    Rules []FwRule `json:"rules"`
}

// FwRule : a firewall rule.
type FwRule struct {
    // SrcSubnet : subnet to match the source IP address with.
    SrcSubnet string `json:"srcSubnet"`
    // DstSubnet : subnet to match the destination IP address with.
    DstSubnet string `json:"dstSubnet"`
    // Protocol : filter by protocol.
    Protocol FwProto `json:"protocol"`
    // Ports : list of destination port to which the rule applies.
    // Empty = any.
    Ports []uint16 `json:"ports"`
    // Action to take.
    Action FwAction `json:"action"`
}

// HostConfig : host configuration that Eden-SDN needs to be informed about.
type HostConfig struct {
    // HostIPs : list of IP addresses used by the host system (on top of which
    // Eden runs).
    // Eden SDN requires at least one routable host IP address.
    HostIPs []string `json:"hostIPs"`
    // NetworkType : which IP versions are used by the host.
    // Even if host uses IPv4 only, it is still possible to have IPv6 inside
    // Eden-SDN. Connectivity between EVE (IPv6) and the controller (IPv4) is established
    // automatically using DNS64 and NAT64. However, the opposite case (from IPv4 to IPv6)
    // is not supported. In other words, to test EVE with IPv4, it is required for the host
    // to use IPv4 (single or dual stack).
    NetworkType NetworkType `json:"networkType"`
}

// Endpoints simulate "remote" clients and servers.
type Endpoints struct {
	// Clients : list of clients. Can be used to run requests towards EVE.
	Clients []Client `json:"clients,omitempty"`
	// DNSServers : list of DNS servers. Can be referenced in DHCP.PrivateDNS.
	DNSServers []DNSServer `json:"dnsServers,omitempty"`
	// NTPServers : list of NTP servers. Can be referenced in DHCP.PrivateNTP.
	NTPServers []NTPServer `json:"ntpServers,omitempty"`
	// HTTPServers : list of HTTP(s) servers. Can be used to test HTTP(s) connectivity
	// from EVE, to serve PAC files, etc.
	HTTPServers []HTTPServer `json:"httpServers,omitempty"`
	// ExplicitProxies : proxies that must be configured explicitly.
	// Consider using together with NetworkModel.Firewall, configured to block HTTP(s)
	// traffic that tries to bypass a proxy.
	ExplicitProxies []ExplicitProxy `json:"explicitProxies,omitempty"`
	// NetbootServers : HTTP/TFTP servers providing artifacts needed to boot EVE OS
	// over a network (using netboot/PXE + iPXE).
	NetbootServers []NetbootServer `json:"netbootServers,omitempty"`
}

// Endpoint simulates "remote" client or a server.
type Endpoint struct {
	// LogicalLabel : logical name used for reference.
	LogicalLabel string `json:"logicalLabel"`
	// FQDN : Fully qualified domain name of the endpoint.
	FQDN string `json:"fqdn"`
	// Subnet : network address + netmask (IPv4 or IPv6).
	// Subnet needs to fit at least two host IP addresses,
	// one for the endpoint, another for a gateway.
	Subnet string `json:"subnet"`
	// IP should be inside of the Subnet.
	IP string `json:"ip"`
	// MTU of the endpoint's interface.
	MTU uint16 `json:"mtu"`
}

// Client emulates a remote client.
// Can be used to run requests towards EVE.
type Client struct {
	// Endpoint configuration.
	Endpoint
}

// DNSServer : endpoint providing DNS service.
type DNSServer struct {
	// Endpoint configuration.
	Endpoint
	// StaticEntries : list of FQDN->IP entries statically configured
	// for the server. These are typically used for endpoints running inside Eden-SDN,
	// which are obviously not known to the public DNS servers.
	StaticEntries []DNSEntry `json:"staticEntries"`
	// UpstreamServers : list of IP addresses of public DNS servers to forward
	// requests to (unless there is a static entry).
	UpstreamServers []string `json:"upstreamServers"`
}

// DNSEntry : Mapping between FQDN and an IP address.
type DNSEntry struct {
	// FQDN : Fully qualified domain name.
	// Can be a reference to endpoint FQDN:
	//  - "endpoint-fqdn.<endpoint-logical-label>" - translated to endpoint's FQDN by Eden-SDN
	FQDN string `json:"fqdn"`
	// IP address or a special value that Eden-SDN will automatically translate
	// to the corresponding IP address:
	//  - "endpoint-ip.<endpoint-logical-label>" - translated to IP address of the endpoint
	//  - "adam-ip" - translated to IP address on which Adam (open-source controller) is deployed and accessible
	IP string `json:"ip"`
}

// HTTPServer : HTTP(s) server.
type HTTPServer struct {
	// Endpoint configuration.
	Endpoint
	// DNSClientConfig : DNS configuration to be applied for the HTTP server.
	DNSClientConfig
	// HTTPPort : port to listen for HTTP requests.
	// Zero value can be used to disable HTTP.
	HTTPPort uint16 `json:"httpPort"`
	// HTTPSPort : port to listen for HTTPS requests.
	// Zero value can be used to disable HTTPS.
	HTTPSPort uint16 `json:"httpsPort"`
	// CertPEM : Server certificate in the PEM format. Required for HTTPS.
	CertPEM string `json:"certPEM"`
	// KeyPEM : Server key in the PEM format. Required for HTTPS.
	KeyPEM string `json:"keyPEM"`
	// Maps URL Path to a content to be returned inside the HTTP(s) response body
	// (text/plain content type).
	Paths map[string]HTTPContent `json:"paths"`
}

// HTTPContent : content returned by an HTTP(s) handler.
type HTTPContent struct {
	// ContentType : HTTP(S) Content-Type.
	ContentType string `json:"contentType"`
	// Content : content returned inside a HTTP(s) response body.
	// It is a string, so binary content is not possible for now.
	Content string `json:"content"`
}

// NTPServer : NTP server.
type NTPServer struct {
	// Endpoint configuration.
	Endpoint
	// List of (public) NTP servers to synchronize with, each referenced
	// by an IP address or a FQDN.
	UpstreamServers []string `json:"upstreamServers"`
}

// ExplicitProxy : HTTP(S) proxy configured explicitly.
type ExplicitProxy struct {
	// Endpoint configuration.
	Endpoint
	// Proxy configuration (common to transparent and explicit proxies).
	Proxy
	// DNSClientConfig : DNS configuration to be applied for the proxy.
	DNSClientConfig
	// HTTPPort : HTTP proxy port.
	// Zero value can be used to disable HTTP proxy.
	HTTPPort uint16 `json:"httpPort"`
	// HTTPSPort : HTTPS proxy port.
	// Zero value can be used to disable HTTPS proxy.
	HTTPSPort uint16 `json:"httpsPort"`
	// Users : define for username/password authentication, leave empty otherwise.
	Users []UserCredentials `json:"users"`
}

// UserCredentials : User credentials for an explicit proxy.
type UserCredentials struct {
	// Username
	Username string `json:"username"`
	// Password
	Password string `json:"password"`
}

// NetbootServer provides HTTP and TFTP server endpoints, serving all artifacts
// needed to boot EVE OS over a network (using iPXE, potentially also supporting
// older PXE-only clients).
// Use in combination with DHCP (see DHCP.NetbootServer).
// XXX Note that in all likelihood, TFTP will serve an iPXE (UEFI) bootloader,
// that once booted will download and boot EVE artifacts over the HTTP endpoint.
// This can work with only a little magic in the DHCP server configuration,
// known as chainloading [1].
// If a client only understands netboot/PXE, DHCP will point the client first
// to the TFTP endpoint. Once the client has booted iPXE, it will be directed
// by the DHCP server to the iPXE script from the HTTP endpoint (just like any other
// iPXE-enabled client).
//
// Example config for dnsmasq:
//   # Boot for iPXE. The idea is to send two different
//   # filenames, the first loads iPXE, and the second tells iPXE what to
//   # load. The dhcp-match sets the ipxe tag for requests from iPXE.
//   #dhcp-boot=undionly.kpxe
//   #dhcp-match=set:ipxe,175 # iPXE sends a 175 option.
//   #dhcp-boot=tag:ipxe,http://boot.ipxe.org/demo/boot.php
//
// [1] https://ipxe.org/howto/chainloading
type NetbootServer struct {
	// Endpoint configuration.
	Endpoint
	// TFTPArtifacts : boot artifacts served by the TFTP server.
	// If not specified, Eden will automatically put iPXE bootloader
	// as the entrypoint.
	TFTPArtifacts []NetbootArtifact `json:"tftpArtifacts"`
	// HTTPArtifacts : boot artifacts served by the HTTP server.
	// If not specified, Eden will automatically put iPXE artifacts
	// needed to boot EVE OS (as links to eserver where these artifacts
	// are uploaded).
	HTTPArtifacts []NetbootArtifact `json:"httpArtifacts"`
}

// NetbootArtifact - one of the artifacts used to boot EVE OS over a network.
type NetbootArtifact struct {
	// Filename : name of the file.
	// It will be served by the associated NetbootServer at the endpoint:
	// (http|tftp)://<netboot-server-fqdn>/<Filename>
	Filename string `json:"filename"`
	// DownloadFromURL : HTTP URL from where the artifact will be downloaded
	// by the netboot server. It can for example point to the eserver.
	// Note that Netboot server will forward the artifact content, not redirect
	// to this URL.
	DownloadFromURL string `json:"downloadFromURL"`
	// Entrypoint : Is this the entrypoint for netboot (i.e. the artifact to boot from)?
	// In case of iPXE, this would be enabled for the inital iPXE script.
	// Exactly one NetbootArtifact should be marked as entrypoint inside
	// both lists NetbootServer.TFTPArtifacts and NetbootServer.HTTPArtifacts.
	// If enabled, this file is then announced to netboot clients using DHCP
	// option 67 (59 in DHCPv6).
	Entrypoint bool `json:"entrypoint"`
}

// IPRange : a range of IP addresses.
type IPRange struct {
    // FromIP : start of the range (includes the address itself).
    FromIP string `json:"fromIP"`
    // ToIP : end of the range (includes the address itself).
    ToIP string `json:"toIP"`
}

// NetworkType : type of the network wrt. IP version used.
type NetworkType uint8

const (
    // Ipv4Only : host uses IPv4 only.
    Ipv4Only NetworkType = iota
    // Ipv6Only : host uses IPv6 only.
    Ipv6Only
    // DualStack : host tuns with dual stack.
    DualStack = 8
)

// ProxyAction : proxy action.
type ProxyAction uint8

const (
    // PxForward : just forward proxied traffic.
    PxForward ProxyAction = iota
    // PxReject : reject (block) proxied traffic.
    PxReject
    // PxMITM : act as a man-in-the-middle (split TLS tunnel in two).
    PxMITM
)

// FwAction : firewall action.
type FwAction uint8

const (
    // Allow traffic.
    FwAllow FwAction = iota
    // Deny traffic.
    FwDeny
)

// FwProto : protocol to apply a firewall rule on.
type FwProto uint8

const (
    AnyProto FwProto = iota
    ICMP
    TCP
    UDP
)