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package ztpv6
import (
"errors"
"fmt"
"regexp"
"github.com/insomniacslk/dhcp/dhcpv6"
)
var circuitRegexs = []*regexp.Regexp{
// Arista Port, Vlan Pattern
regexp.MustCompile("Ethernet(?P<port>[0-9]+):(?P<vlan>[0-9]+)"),
// Arista Slot, Mod, Port Pattern
regexp.MustCompile("Ethernet(?P<slot>[0-9]+)/(?P<mod>[0-9]+)/(?P<port>[0-9]+)"),
// Juniper QFX et-0/0/0:0.0 and xe-0/0/0:0.0
regexp.MustCompile("^(et|xe)-(?P<slot>[0-9]+)/(?P<mod>[0-9]+)/(?P<port>[0-9]+):(?P<subport>[0-9]+).*$"),
// Juniper PTX et-0/0/0.0
regexp.MustCompile("^et-(?P<slot>[0-9]+)/(?P<mod>[0-9]+)/(?P<port>[0-9]+).(?P<subport>[0-9]+)$"),
// Juniper EX ge-0/0/0.0
regexp.MustCompile("^ge-(?P<slot>[0-9]+)/(?P<mod>[0-9]+)/(?P<port>[0-9]+).(?P<subport>[0-9]+).*"),
// Arista Ethernet3/17/1
// Sometimes Arista prepend circuit id type(1 byte) and length(1 byte) not using ^
regexp.MustCompile("Ethernet(?P<slot>[0-9]+)/(?P<mod>[0-9]+)/(?P<port>[0-9]+)$"),
// Juniper QFX et-1/0/61
regexp.MustCompile("^et-(?P<slot>[0-9]+)/(?P<mod>[0-9]+)/(?P<port>[0-9]+)$"),
// Arista Ethernet14:Vlan2001
// Arista Ethernet10:2020
regexp.MustCompile("Ethernet(?P<port>[0-9]+):(?P<vlan>.*)$"),
// Cisco Gi1/10:2020
regexp.MustCompile("^Gi(?P<slot>[0-9]+)/(?P<port>[0-9]+):(?P<vlan>.*)$"),
// Nexus Ethernet1/3
regexp.MustCompile("^Ethernet(?P<slot>[0-9]+)/(?P<port>[0-9]+)$"),
// Juniper bundle interface ae52.0
regexp.MustCompile("^ae(?P<port>[0-9]+).(?P<subport>[0-9])$"),
}
// 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) {
for _, re := range circuitRegexs {
match := re.FindStringSubmatch(circuitInfo)
if len(match) == 0 {
continue
}
c := CircuitID{}
for i, k := range re.SubexpNames() {
switch k {
case "slot":
c.Slot = match[i]
case "mod":
c.Module = match[i]
case "port":
c.Port = match[i]
case "subport":
c.SubPort = match[i]
case "vlan":
c.Vlan = match[i]
}
}
return &c, nil
}
return nil, fmt.Errorf("Unable to match circuit id : %s with listed regexes of interface types", circuitInfo)
}
// 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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