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package routingtable
import (
"fmt"
"github.com/pkg/errors"
"net/netip"
)
type Address struct {
Addr netip.Addr
Prefix netip.Prefix
}
type Hop struct {
Cost uint32
VipAsStr string
}
type RoutingTable map[Address]Hop
const (
STATIC_COST uint32 = 4294967295 // 2^32 - 1
)
// TODO: consider making this take in arguments, such as a config file
func New() *RoutingTable {
var table = make(RoutingTable)
return &table
}
//func Initialize(config lnxconfig.IPConfig) error {
// if len(os.Args) != 2 {
// fmt.Printf("Usage: %s <configFile>\n", os.Args[0])
// os.Exit(1)
// }
// fileName := os.Args[1]
//
// lnxConfig, err := lnxconfig.ParseConfig(fileName)
// if err != nil {
// panic(err)
// }
//
// // make and populate routing table
// table = make(map[Address]Route)
// for _, iface := range lnxConfig.Interfaces {
// var address = Address{iface.AssignedIP, iface.AssignedPrefix}
// var route = Route{Address{iface.AssignedIP, iface.AssignedPrefix}, 0, iface.AssignedPrefix}
// table[address] = route
// }
//
//
//}
func AddRoute(srcAddr Address, cost uint32, addrAsStr string, tableReference *RoutingTable) error {
if _, ok := (*tableReference)[srcAddr]; ok {
return errors.New("Route already exists")
}
(*tableReference)[srcAddr] = Hop{cost, addrAsStr}
return nil
}
func RemoveRoute(dest Address, table *RoutingTable) error {
if _, ok := (*table)[dest]; !ok {
return errors.New("Route doesn't exist")
}
delete(*table, dest)
return nil
}
// TODO: implement this with most specific prefix matching
func Route(dest Address, table *RoutingTable) (Hop, error) {
// get the most specific route
for address, route := range *table {
if address.Prefix.Contains(dest.Addr) {
return route, nil
}
}
return Hop{}, errors.New("Route doesn't exist")
}
func SprintRoutingTable(table *RoutingTable) string {
message := ""
for address, route := range *table {
message += fmt.Sprintf("%s/%d\t%d\n", address.Addr, address.Prefix, route.Cost)
}
return message
}
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