From 16fef9e9f716edb5fd09e5f486d12f82161984c0 Mon Sep 17 00:00:00 2001
From: Zack Scholl <zack.scholl@gmail.com>
Date: Mon, 5 Oct 2020 08:12:30 -0700
Subject: [PATCH] don't proxy local connectoins

---
 src/comm/comm.go   |  3 ++-
 src/utils/utils.go | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/comm/comm.go b/src/comm/comm.go
index af617e83..7afa12d8 100644
--- a/src/comm/comm.go
+++ b/src/comm/comm.go
@@ -8,6 +8,7 @@ import (
 	"net"
 	"time"
 
+	"github.com/schollz/croc/v8/src/utils"
 	log "github.com/schollz/logger"
 	"golang.org/x/net/proxy"
 )
@@ -28,7 +29,7 @@ func NewConnection(address string, timelimit ...time.Duration) (c *Comm, err err
 		tlimit = timelimit[0]
 	}
 	var connection net.Conn
-	if Socks5Proxy != "" {
+	if Socks5Proxy != "" && !utils.IsLocalIP(address) {
 		var dialer proxy.Dialer
 		dialer, err = proxy.SOCKS5("tcp", Socks5Proxy, nil, proxy.Direct)
 		if err != nil {
diff --git a/src/utils/utils.go b/src/utils/utils.go
index 8a0224bd..a393c792 100644
--- a/src/utils/utils.go
+++ b/src/utils/utils.go
@@ -261,3 +261,28 @@ func FindOpenPorts(host string, portNumStart, numPorts int) (openPorts []int) {
 	}
 	return
 }
+
+var PrivateIPNetworks = []net.IPNet{
+	net.IPNet{
+		IP:   net.ParseIP("10.0.0.0"),
+		Mask: net.CIDRMask(8, 32),
+	},
+	net.IPNet{
+		IP:   net.ParseIP("172.16.0.0"),
+		Mask: net.CIDRMask(12, 32),
+	},
+	net.IPNet{
+		IP:   net.ParseIP("192.168.0.0"),
+		Mask: net.CIDRMask(16, 32),
+	},
+}
+
+func IsLocalIP(ipaddress string) bool {
+	ip := net.ParseIP(ipaddress)
+	for _, ipNet := range PrivateIPNetworks {
+		if ipNet.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}