1{ 2 # substring data expression 3 # empty configs are not accepted by Kea 4 "Dhcp4": { 5 "valid-lifetime": 1800, 6 "client-classes": [ 7 # use substring in a reductible match 8 /// match: substring(option dhcp.host-name, 0, 3) 9 { 10 "name": "reductible" 11 }, 12 /// subclass selector 'www' 13 { 14 "name": "sub#reductible#0", 15 /// from: match substring(option dhcp.host-name, 0, 3) 16 /// data: 'www' 17 "test": "substring(option[12].hex,0,3) == 'www'" 18 }, 19 # reduce literals too 20 { 21 "name": "literal", 22 /// from: match if (option dhcp.host-name) = (substring('www.example.com', 0, 3)) 23 "test": "option[12].hex == 'www'" 24 } 25 ], 26 "option-data": [ 27// # raw 28// { 29// "space": "dhcp4", 30// "name": "domain-name", 31// "code": 15, 32// "csv-format": false, 33// "expression": { 34// "substring": { 35// "expression": { 36// "option": { 37// "universe": "dhcp", 38// "name": "domain-name", 39// "code": 15 40// } 41// }, 42// "offset": 4, 43// "length": 1000 44// } 45// } 46// } 47 ] 48 } 49} 50