/
agent.go
85 lines (79 loc) · 1.73 KB
/
agent.go
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
package agent
import (
"bytes"
"encoding/json"
"github.com/anyisalin/infra_graph_collector/pkg/structs"
"github.com/cakturk/go-netstat/netstat"
"log"
"net"
"net/http"
"os"
"strings"
)
func getPeers(selfIP string, allowPrefixList []string) ([]structs.Peer, error) {
peers := make([]structs.Peer, 0)
socks, err := netstat.TCPSocks(netstat.NoopFilter)
if err != nil {
return nil, err
}
for _, e := range socks {
isAllow := false
remoteIP := e.RemoteAddr.IP.String()
if remoteIP == selfIP {
continue
}
for _, allowPrefix := range allowPrefixList {
if strings.HasPrefix(remoteIP, allowPrefix) {
isAllow = true
break
}
}
if isAllow {
peers = append(peers, structs.Peer{Addr: remoteIP, Port: e.RemoteAddr.Port})
}
}
return peers, nil
}
func Run(endpoint, selfIPPrefix, allowPrefixListString string) {
hostname, _ := os.Hostname()
ifaces, err := net.Interfaces()
if err != nil {
log.Fatal(err)
}
var selfIP string
allowPrefixList := strings.Split(allowPrefixListString, ",")
for _, i := range ifaces {
addrs, _ := i.Addrs()
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if ip != nil && strings.HasPrefix(ip.String(), selfIPPrefix) {
selfIP = ip.String()
}
}
}
if selfIP == "" {
log.Fatal("can not find self ip")
}
peers, err := getPeers(selfIP, allowPrefixList)
if err != nil {
log.Fatal(err)
}
payload := &structs.Payload{
Self: structs.Peer{Hostname: hostname, Addr: selfIP},
Peers: peers,
}
b, err := json.Marshal(payload)
if err != nil {
log.Fatal(err)
}
_, err = http.Post(endpoint, "application/json", bytes.NewBuffer(b))
if err != nil {
log.Fatal(err)
}
}