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package ztpv4
import (
"errors"
"strings"
"github.com/insomniacslk/dhcp/dhcpv4"
)
// VendorData is optional data a particular vendor may or may not include
// in the Vendor Class options. All values are optional and will be zero
// values if not found.
type VendorData struct {
VendorName string
Model string
Serial string
}
var errVendorOptionMalformed = errors.New("malformed vendor option")
// ParseVendorData will try to parse dhcp4 options looking for more
// specific vendor data (like model, serial number, etc).
func ParseVendorData(packet *dhcpv4.DHCPv4) (*VendorData, error) {
return parseV4VendorClass(packet);
}
// parseV4Opt60 will attempt to look at the Vendor Class option (Option 60) on
// DHCPv4. The option is formatted as a string with the content being specific
// for the vendor, usually using a delimitator to separate the values.
// See: https://tools.ietf.org/html/rfc1533#section-9.11
func parseV4VendorClass(packet *dhcpv4.DHCPv4) (*VendorData, error) {
vd := &VendorData{}
opt := packet.GetOneOption(dhcpv4.OptionClassIdentifier)
if opt == nil {
return nil, nil
}
vc := opt.(*dhcpv4.OptClassIdentifier).Identifier
switch {
// Arista;DCS-7050S-64;01.23;JPE12221671
case strings.HasPrefix(vc, "Arista;"):
p := strings.Split(vc, ";")
if len(p) < 4 {
return nil, errVendorOptionMalformed
}
vd.VendorName = p[0]
vd.Model = p[1]
vd.Serial = p[3]
return vd, nil
// ZPESystems:NSC:002251623
case strings.HasPrefix(vc, "ZPESystems:"):
p := strings.Split(vc, ":")
if len(p) < 3 {
return nil, errVendorOptionMalformed
}
vd.VendorName = p[0]
vd.Model = p[1]
vd.Serial = p[2]
return vd, nil
// Juniper option 60 parsing is a bit more nuanced. The following are all
// "valid" identifying stings for Juniper:
// Juniper-ptx1000-DD576 <vendor>-<model>-<serial
// Juniper-qfx10008 <vendor>-<model> (serial in hostname option)
// Juniper-qfx10002-361-DN817 <vendor>-<model>-<serial> (model has a dash in it!)
case strings.HasPrefix(vc, "Juniper-"):
// strip of the prefix
vc := vc[len("Juniper-"):]
vd.VendorName = "Juniper"
sepIdx := strings.LastIndex(vc, "-")
if sepIdx == -1 {
// No separator was found. Attempt serial number from the hostname
if opt := packet.GetOneOption(dhcpv4.OptionHostName); opt != nil {
vd.Serial = opt.(*dhcpv4.OptHostName).HostName
} else {
return nil, errVendorOptionMalformed
}
} else {
vd.Serial = vc[sepIdx+1:]
vc = vc[:sepIdx]
}
vd.Model = vc
return vd, nil
}
// We didn't match anything.
return nil, nil
}
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