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package routingTable
import (
"fmt"
"net"
"net/netip"
"os"
"bufio"
)
type Address struct {
addr netip.Addr;
prefix netip.Prefix;
}
type Routing struct {
dest Address;
cost uint16_t;
mask netip.Prefix;
}
routingTable := make(map[Address]Routing)
func Initialize(config 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)
}
// populate routing table
for _, iface := range lnxConfig.Interfaces {
routingTable[Address{iface.AssignedIP, iface.AssignedPrefix}] = Routing{Address{iface.AssignedIP, iface.AssignedPrefix}, 0, iface.AssignedPrefix}
}
}
func AddRoute(dest Address, cost uint16_t, mask netip.Prefix) (error) {
if _, ok := routingTable[dest]; ok {
return newErrString(ln, "Route already exists")
}
routingTable[dest] = Routing{dest, cost, mask}
}
func RemoveRoute(dest Address) (error) {
if _, ok := routingTable[dest]; !ok {
return newErrString(ln, "Route does not exist")
}
delete(routingTable, dest)
}
func GetRoute(dest Address) (Routing, error) {
// get the most specific route
for key, value := range routingTable {
if key.prefix.Contains(dest.addr) {
return value, nil
}
}
return nil, newErrString(ln, "Route does not exist")
}
func PrintRoutingTable() {
for key, value := range routingTable {
fmt.Printf("%s/%d\t%d\n", key.addr, key.prefix.Bits(), value.cost)
}
}
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