const LockfilePath14x = "@xtables"

const LockfilePath16x = "/run/xtables.lock"

const WaitIntervalString = "-W"

const WaitIntervalUsecondsValue = "100000"

const WaitSecondsValue = "5"

const WaitString = "-w"

var MinCheckVersion = utilversion.MustParseGeneric("1.4.11")

var RandomFullyMinVersion = utilversion.MustParseGeneric("1.6.2")

var WaitIntervalMinVersion = utilversion.MustParseGeneric("1.6.1")

var WaitMinVersion = utilversion.MustParseGeneric("1.4.20")

var WaitRestoreMinVersion = utilversion.MustParseGeneric("1.6.2")

var WaitSecondsMinVersion = utilversion.MustParseGeneric("1.4.22")

type Chain string

const (
	// ChainPostrouting used for source NAT in nat table
	ChainPostrouting Chain = "POSTROUTING"
	// ChainPrerouting used for DNAT (destination NAT) in nat table
	ChainPrerouting Chain = "PREROUTING"
	// ChainOutput used for the packets going out from local
	ChainOutput Chain = "OUTPUT"
	// ChainInput used for incoming packets
	ChainInput Chain = "INPUT"
	// ChainForward used for the packets for another NIC
	ChainForward Chain = "FORWARD"
)

type FlushFlag bool

const FlushTables FlushFlag = true

const NoFlushTables FlushFlag = false

type Interface interface {
	// EnsureChain checks if the specified chain exists and, if not, creates it.  If the chain existed, return true.
	EnsureChain(table Table, chain Chain) (bool, error)
	// FlushChain clears the specified chain.  If the chain did not exist, return error.
	FlushChain(table Table, chain Chain) error
	// DeleteChain deletes the specified chain.  If the chain did not exist, return error.
	DeleteChain(table Table, chain Chain) error
	// ChainExists tests whether the specified chain exists, returning an error if it
	// does not, or if it is unable to check.
	ChainExists(table Table, chain Chain) (bool, error)
	// EnsureRule checks if the specified rule is present and, if not, creates it.  If the rule existed, return true.
	EnsureRule(position RulePosition, table Table, chain Chain, args ...string) (bool, error)
	// DeleteRule checks if the specified rule is present and, if so, deletes it.
	DeleteRule(table Table, chain Chain, args ...string) error
	// IsIPv6 returns true if this is managing ipv6 tables.
	IsIPv6() bool
	// Protocol returns the IP family this instance is managing,
	Protocol() Protocol
	// SaveInto calls `iptables-save` for table and stores result in a given buffer.
	SaveInto(table Table, buffer *bytes.Buffer) error
	// Restore runs `iptables-restore` passing data through []byte.
	// table is the Table to restore
	// data should be formatted like the output of SaveInto()
	// flush sets the presence of the "--noflush" flag. see: FlushFlag
	// counters sets the "--counters" flag. see: RestoreCountersFlag
	Restore(table Table, data []byte, flush FlushFlag, counters RestoreCountersFlag) error
	// RestoreAll is the same as Restore except that no table is specified.
	RestoreAll(data []byte, flush FlushFlag, counters RestoreCountersFlag) error
	// Monitor detects when the given iptables tables have been flushed by an external
	// tool (e.g. a firewall reload) by creating canary chains and polling to see if
	// they have been deleted. (Specifically, it polls tables[0] every interval until
	// the canary has been deleted from there, then waits a short additional time for
	// the canaries to be deleted from the remaining tables as well. You can optimize
	// the polling by listing a relatively empty table in tables[0]). When a flush is
	// detected, this calls the reloadFunc so the caller can reload their own iptables
	// rules. If it is unable to create the canary chains (either initially or after
	// a reload) it will log an error and stop monitoring.
	// (This function should be called from a goroutine.)
	Monitor(canary Chain, tables []Table, reloadFunc func(), interval time.Duration, stopCh <-chan struct{})
	// HasRandomFully reveals whether `-j MASQUERADE` takes the
	// `--random-fully` option.  This is helpful to work around a
	// Linux kernel bug that sometimes causes multiple flows to get
	// mapped to the same IP:PORT and consequently some suffer packet
	// drops.
	HasRandomFully() bool

	// Present checks if the kernel supports the iptable interface
	Present() bool
}

type LineData struct {
	// Line holds the line number (the first line is 1).
	Line int
	// The data of the line.
	Data string
}

type ParseError interface {
	// Line returns the line number on which the parse error was reported.
	// NOTE: First line is 1.
	Line() int
	// Error returns the error message of the parse error, including line number.
	Error() string
}

type Protocol string

const (
	// ProtocolIPv4 represents ipv4 protocol in iptables
	ProtocolIPv4 Protocol = "IPv4"
	// ProtocolIPv6 represents ipv6 protocol in iptables
	ProtocolIPv6 Protocol = "IPv6"
)

type RestoreCountersFlag bool

const NoRestoreCounters RestoreCountersFlag = false

const RestoreCounters RestoreCountersFlag = true

type RulePosition string

const (
	// Prepend is the insert flag for iptable
	Prepend RulePosition = "-I"
	// Append is the append flag for iptable
	Append RulePosition = "-A"
)

type Table string

const (
	// TableNAT represents the built-in nat table
	TableNAT Table = "nat"
	// TableFilter represents the built-in filter table
	TableFilter Table = "filter"
	// TableMangle represents the built-in mangle table
	TableMangle Table = "mangle"
)