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package main
import (
"bufio"
"fmt"
"iptcp/pkg/ipstack"
"net/netip"
"os"
"strings"
)
func main() {
if len(os.Args) == 1 {
fmt.Printf("Usage: %s <configFile>\n", os.Args[0])
os.Exit(1)
}
fileName := os.Args[2]
err := ipstack.Initialize(fileName)
if err != nil {
return
}
ipstack.RegisterProtocolHandler(ipstack.TEST_PROTOCOL)
ipstack.RegisterProtocolHandler(ipstack.RIP_PROTOCOL)
// TODO @ MICHAEL: Dont know why its not running instantly
//go func() {
// for {
// ipstack.RequestRip()
// // takes time to compute I think
// // TODO @ MICHAEL
// time.Sleep(2 * time.Second)
// }
//}()
// TODO @ MICHEAL
// go ipstack.CheckAndUpdateRoutingTable()
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := scanner.Text()
switch line {
case "li":
fmt.Println("Name\tAddr/Prefix\tState")
ipstack.SprintInterfaces()
case "ln":
fmt.Println("Iface\tVIP\tUDPAddr")
ipstack.SprintNeighbors()
case "lr":
fmt.Println("T\tPrefix\tNext Hop\tCost")
ipstack.SprintRoutingTable()
case "q":
ipstack.CleanUp()
os.Exit(0)
default:
if len(line) > 4 {
if line[:4] == "down" {
ifaceName := line[5:]
ipstack.InterfaceDownREPL(ifaceName)
}
if line[:4] == "send" {
// get IP address and message that follows it
IPAndMessage := strings.Split(line, " ")
ipAddr := IPAndMessage[1]
message := IPAndMessage[2:]
// combine message into one string
messageToSend := strings.Join(message, " ")
messageToSendBytes := []byte(messageToSend)
hop, err := ipstack.LongestPrefix(netip.MustParseAddr(ipAddr))
if err != nil {
fmt.Println(err)
continue
}
myAddr := hop.Interface.IpPrefix.Addr()
for _, neighbor := range ipstack.GetNeighbors()[hop.Interface.Name] {
if neighbor.VipAddr == netip.MustParseAddr(ipAddr) ||
neighbor.VipAddr == hop.VIP {
bytesWritten, err := ipstack.SendIP(&myAddr, neighbor, ipstack.TEST_PROTOCOL, messageToSendBytes, ipAddr, nil)
if err != nil {
fmt.Println(err)
} else {
fmt.Printf("Sent %d bytes to %s\n", bytesWritten, neighbor.VipAddr.String())
}
}
}
}
}
if len(line) > 2 {
if line[:2] == "up" {
// get interface name
ifaceName := line[3:]
ipstack.InterfaceUpREPL(ifaceName)
}
}
continue
}
}
}
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