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package ztpv6
import (
"errors"
"fmt"
"regexp"
"github.com/insomniacslk/dhcp/dhcpv6"
)
var (
// Arista Port, Vlan Pattern
aristaPVPattern = regexp.MustCompile("Ethernet(?P<port>[0-9]+):(?P<vlan>[0-9]+)")
// Arista Slot, Mod, Port Pattern
aristaSMPPattern = regexp.MustCompile("Ethernet(?P<slot>[0-9]+)/(?P<module>[0-9]+)/(?P<port>[0-9]+)")
)
// CircuitID represents the structure of network vendor interface formats
type CircuitID struct {
Slot string
Module string
Port string
SubPort string
Vlan string
}
// ParseRemoteId will parse the RemoteId Option data for Vendor Specific data
func ParseRemoteID(packet dhcpv6.DHCPv6) (*CircuitID, error) {
// Need to decapsulate the packet after multiple relays in order to reach RemoteId data
inner, err := dhcpv6.DecapsulateRelayIndex(packet, -1)
if err != nil {
return nil, fmt.Errorf("failed to decapsulate relay index: %v", err)
}
if rm, ok := inner.(*dhcpv6.RelayMessage); ok {
if rid := rm.Options.RemoteID(); rid != nil {
remoteID := string(rid.RemoteID)
circ, err := matchCircuitId(remoteID)
if err == nil {
return circ, nil
}
}
// if we fail to find circuit id from remote id try to use interface ID option
if iid := rm.Options.InterfaceID(); iid != nil {
interfaceID := string(iid)
circ, err := matchCircuitId(interfaceID)
if err == nil {
return circ, nil
}
}
}
return nil, errors.New("failed to parse RemoteID and InterfaceID option data")
}
func matchCircuitId(circuitInfo string) (*CircuitID, error) {
var names, matches []string
switch {
case aristaPVPattern.MatchString(circuitInfo):
matches = aristaPVPattern.FindStringSubmatch(circuitInfo)
names = aristaPVPattern.SubexpNames()
case aristaSMPPattern.MatchString(circuitInfo):
matches = aristaSMPPattern.FindStringSubmatch(circuitInfo)
names = aristaSMPPattern.SubexpNames()
}
if len(matches) == 0 {
return nil, fmt.Errorf("no circuitId regex matches for %v", circuitInfo)
}
var circuit CircuitID
for i, match := range matches {
switch names[i] {
case "port":
circuit.Port = match
case "slot":
circuit.Slot = match
case "module":
circuit.Module = match
case "subport":
circuit.SubPort = match
case "vlan":
circuit.Vlan = match
}
}
return &circuit, nil
}
// FormatCircuitID is the CircuitID format we send in our Bootfile URL for ZTP devices
func (c *CircuitID) FormatCircuitID() string {
return fmt.Sprintf("%v,%v,%v,%v,%v", c.Slot, c.Module, c.Port, c.SubPort, c.Vlan)
}
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