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package ztpv4
import (
"fmt"
"regexp"
"github.com/insomniacslk/dhcp/dhcpv4"
)
// CircuitID represents the structure of network vendor interface formats
type CircuitID struct {
Slot string
Module string
Port string
SubPort string
Vlan string
}
var circuitRegexs = []*regexp.Regexp{
// Juniper QFX et-0/0/0:0.0
regexp.MustCompile("^et-(?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]+)$"),
// Juniper bundle interface ae52.0
regexp.MustCompile("^ae(?P<port>[0-9]+).(?P<subport>[0-9])$"),
}
// ParseCircuitID will parse dhcpv4 packet and return CircuitID info
func ParseCircuitID(packet *dhcpv4.DHCPv4) (*CircuitID, error) {
// CircuitId info is stored as sub-option field in RelayAgentInformationOption
relayOptions := packet.RelayAgentInfo()
if relayOptions == nil {
return nil, fmt.Errorf("No relay agent information option found in the dhcpv4 pkt")
}
// As per RFC 3046 sub-Option 1 is circuit-id. Look at 2.0 section in that RFC
// https://tools.ietf.org/html/rfc3046
circuitIdStr := string(relayOptions.Options.Get(dhcpv4.AgentCircuitIDSubOption))
if circuitIdStr == "" {
return nil, fmt.Errorf("no circuit-id suboption found in dhcpv4 packet")
}
circuitId, err := matchCircuitID(circuitIdStr)
if err != nil {
return nil, err
}
return circuitId, nil
}
func matchCircuitID(circuitIdStr string) (*CircuitID, error) {
for _, re := range circuitRegexs {
match := re.FindStringSubmatch(circuitIdStr)
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", circuitIdStr)
}
// 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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