3.18.4 virtual private network

2024-07-14 11:00:43 +08:00
parent e7b696c474
commit 9dda148232
62 changed files with 3845 additions and 898 deletions
@@ -0,0 +1,74 @@
+package openp2p
+
+import (
+	"log"
+	"os/exec"
+	"runtime"
+)
+
+func allowTunForward() {
+	if runtime.GOOS != "linux" { // only support Linux
+		return
+	}
+	exec.Command("sh", "-c", `iptables -t filter -D FORWARD -i optun -j ACCEPT`).Run()
+	exec.Command("sh", "-c", `iptables -t filter -D FORWARD -o optun -j ACCEPT`).Run()
+	err := exec.Command("sh", "-c", `iptables -t filter -I FORWARD -i optun -j ACCEPT`).Run()
+	if err != nil {
+		log.Println("allow foward in error:", err)
+	}
+	err = exec.Command("sh", "-c", `iptables -t filter -I FORWARD -o optun -j ACCEPT`).Run()
+	if err != nil {
+		log.Println("allow foward out error:", err)
+	}
+}
+
+func clearSNATRule() {
+	if runtime.GOOS != "linux" {
+		return
+	}
+	execCommand("iptables", true, "-t", "nat", "-D", "POSTROUTING", "-j", "OPSDWAN")
+	execCommand("iptables", true, "-t", "nat", "-F", "OPSDWAN")
+	execCommand("iptables", true, "-t", "nat", "-X", "OPSDWAN")
+}
+
+func initSNATRule(localNet string) {
+	if runtime.GOOS != "linux" {
+		return
+	}
+	clearSNATRule()
+
+	err := execCommand("iptables", true, "-t", "nat", "-N", "OPSDWAN")
+	if err != nil {
+		log.Println("iptables new sdwan chain error:", err)
+		return
+	}
+	err = execCommand("iptables", true, "-t", "nat", "-A", "POSTROUTING", "-j", "OPSDWAN")
+	if err != nil {
+		log.Println("iptables append postrouting error:", err)
+		return
+	}
+	err = execCommand("iptables", true, "-t", "nat", "-A", "OPSDWAN",
+		"-o", "optun", "!", "-s", localNet, "-j", "MASQUERADE")
+	if err != nil {
+		log.Println("add optun snat error:", err)
+		return
+	}
+	err = execCommand("iptables", true, "-t", "nat", "-A", "OPSDWAN", "!", "-o", "optun",
+		"-s", localNet, "-j", "MASQUERADE")
+	if err != nil {
+		log.Println("add optun snat error:", err)
+		return
+	}
+}
+
+func addSNATRule(target string) {
+	if runtime.GOOS != "linux" {
+		return
+	}
+	err := execCommand("iptables", true, "-t", "nat", "-A", "OPSDWAN", "!", "-o", "optun",
+		"-s", target, "-j", "MASQUERADE")
+	if err != nil {
+		log.Println("iptables add optun snat error:", err)
+		return
+	}
+}