1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
package main
import (
"bufio"
"fmt"
"os"
"iptcp/pkg/ipstack"
"strings"
)
func main() {
if len(os.Args) != 2 {
fmt.Printf("Usage: %s <configFile>\n", os.Args[0])
os.Exit(1)
}
fileName := os.Args[1]
go ipstack.Initialize(fileName)
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := scanner.Text()
if line == "li" {
fmt.Println("Name\tAddr/Prefix\tState")
ipstack.SprintInterfaces()
}
if line == "ln" {
fmt.Println("Iface\tVIP\tUDPAddr")
ipstack.SprintNeighbors()
}
if line == "lr" {
fmt.Println("T\tPrefix\tNext Hop\tCost")
ipstack.SprintRoutingTable()
}
if len(line) > 4 {
if line[:4] == "down" {
// get interface name
ifaceName := line[5:]
ipstack.InterfaceDownREPL(ifaceName)
}
if line[:4] == "send" {
// get IP address and message that follows it
listOfWords := strings.Split(line, " ")
ipAddr := listOfWords[1]
message := listOfWords[2:]
// combine message into one string
messageToSend := strings.Join(message, " ")
// convert message to byte array
messageToSendBytes := []byte(messageToSend)
// get interface by ipAddr
iface, err := ipstack.GetNeighborByIP(ipAddr)
if err != nil {
fmt.Println(err)
iface, err = ipstack.GetRouteByIP(ipAddr)
if err != nil {
fmt.Println(err)
continue
}
err = ipstack.SendIP(ipstack.GetMyVIP(), iface, 0, messageToSendBytes, ipAddr)
if err != nil {
fmt.Println(err)
continue
}
continue
}
err = ipstack.SendIP(ipstack.GetMyVIP(), iface, 0, messageToSendBytes, ipAddr)
if err != nil {
fmt.Println(err)
continue
}
}
}
if len(line) > 2 {
if line[:2] == "up" {
// get interface name
ifaceName := line[3:]
ipstack.InterfaceUpREPL(ifaceName)
}
}
if line == "q" {
ipstack.CleanUp()
os.Exit(0)
}
}
}
|
