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package main
import (
"bufio"
"fmt"
"iptcp/pkg/ipstack"
// "iptcp/pkg/tcpstack"
"net/netip"
"os"
"strconv"
"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.TCP_PROTOCOL)
// create a map of sockets
sockets := make(map[int]*ipstack.VTCPConn)
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := scanner.Text()
tokens := strings.Split(line, " ")
switch tokens[0] {
case "li":
fmt.Println("Name\tAddr/Prefix\tState")
fmt.Println(ipstack.SprintInterfaces())
case "ln":
fmt.Println("Iface\tVIP\tUDPAddr")
fmt.Println(ipstack.SprintNeighbors())
case "lr":
fmt.Println("T\tPrefix\tNext Hop\tCost")
fmt.Println(ipstack.SprintRoutingTable())
case "q":
ipstack.CleanUp()
os.Exit(0)
case "exit":
ipstack.CleanUp()
os.Exit(0)
case "down":
// get interface name
ifaceName := tokens[1]
ipstack.InterfaceDownREPL(ifaceName)
case "up":
// get interface name
ifaceName := tokens[1]
ipstack.InterfaceUpREPL(ifaceName)
case "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)
address, _ := netip.ParseAddr(ipAddr)
hop, err := ipstack.Route(address)
if err != nil {
fmt.Println(err)
continue
}
myAddr := hop.Interface.IpPrefix.Addr()
for _, neighbor := range ipstack.GetNeighbors()[hop.Interface.Name] {
if neighbor.VipAddr == address ||
neighbor.VipAddr == hop.VIP && hop.Type == "S" {
bytesWritten, err := ipstack.SendIP(&myAddr, neighbor, ipstack.TEST_PROTOCOL, messageToSendBytes, ipAddr, nil)
fmt.Printf("Sent %d bytes to %s\n", bytesWritten, neighbor.VipAddr.String())
if err != nil {
fmt.Println(err)
}
}
}
// ********************************************TCP REPL***************************************************************
case "a":
// accept a connection
// get the port number
port := line[2:]
uint16Port, err := strconv.ParseUint(port, 10, 16)
if err != nil {
fmt.Println(err)
continue
}
// listen on the port
listener, err := ipstack.VListen(uint16(uint16Port))
if err != nil {
fmt.Println(err)
continue
}
go func() {
conn, err := listener.VAccept()
if err != nil {
fmt.Println(err)
}
sockets[conn.Socket] = conn
}()
case "c":
if len(tokens) != 3 {
fmt.Println("Invalid command: ", line)
continue
}
// connect to a port
vipAddr := tokens[1]
port := tokens[2]
uint16Port, err := strconv.ParseUint(port, 10, 16)
if err != nil {
fmt.Println(err)
continue
}
conn, err := ipstack.VConnect(vipAddr, uint16(uint16Port))
if err != nil {
fmt.Println(err)
continue
}
sockets[conn.Socket] = conn
case "ls":
// list sockets
fmt.Println("SID\tLAddr\t\tLPort\tRAddr\t\tRPort\tRStatus")
fmt.Println(ipstack.SprintSockets())
case "s":
if len(tokens) < 3 {
fmt.Println("Invalid command: ", line)
continue
}
socketID, err := strconv.Atoi(tokens[1])
if err != nil {
fmt.Println(err)
continue
}
conn, inMap := sockets[socketID]
if !inMap {
fmt.Println("Invalid socket ID")
continue
}
message := tokens[2:]
messageToSend := strings.Join(message, " ")
messageToSendBytes := []byte(messageToSend)
bytesWritten, err := conn.VWrite(messageToSendBytes)
if err != nil {
fmt.Println(err)
continue
}
fmt.Printf("Sent %d bytes\n", bytesWritten)
case "r":
if len(tokens) != 3 {
fmt.Println("Invalid command: ", line)
continue
}
socketID, err := strconv.Atoi(tokens[1])
if err != nil {
fmt.Println(err)
continue
}
numberOfBytes, err := strconv.Atoi(tokens[2])
if err != nil {
fmt.Println(err)
continue
}
conn, inMap := sockets[socketID]
if !inMap {
fmt.Println("Invalid socket ID")
continue
}
// buffer := make([]byte, numberOfBytes)
bytesRead, message, err := conn.VRead(numberOfBytes)
if err != nil {
fmt.Println(err)
continue
}
fmt.Printf("Read %d bytes: %s\n", bytesRead, message)
case "cl":
// close a socket
if len(tokens) != 2 {
fmt.Println("Invalid command: ", line)
continue
}
socketID, err := strconv.Atoi(tokens[1])
if err != nil {
fmt.Println(err)
continue
}
conn, _ := sockets[socketID]
err = conn.VClose()
if err != nil {
fmt.Println(err)
continue
}
default:
fmt.Println("Invalid command: ", line)
fmt.Println("Commands: ")
fmt.Println(" exit Terminate this program")
fmt.Println(" li List interfaces")
fmt.Println(" lr List routes")
fmt.Println(" ln List available neighbors")
fmt.Println(" up Enable an interface")
fmt.Println(" down Disable an interface")
fmt.Println(" send Send test packet")
continue
}
}
}
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