From ee0392ed03bf89417ebe26dd53a738b65974ae31 Mon Sep 17 00:00:00 2001
From: wangyu- <wangyucn@gmail.com>
Date: Fri, 3 Aug 2018 16:43:56 -0500
Subject: [PATCH] new option disable-checksum

---
 misc.cpp   | 7 +++++++
 misc.h     | 1 +
 packet.cpp | 3 +++
 3 files changed, 11 insertions(+)

diff --git a/misc.cpp b/misc.cpp
index ef57344..39fbe9d 100644
--- a/misc.cpp
+++ b/misc.cpp
@@ -15,6 +15,7 @@ int mtu_warn=1350;
 
 int disable_mtu_warn=1;
 int disable_fec=0;
+int disable_checksum=0;
 
 int debug_force_flush_fec=0;
 
@@ -638,6 +639,7 @@ void process_arg(int argc, char *argv[])
 		{"disable-fec", no_argument,    0, 1},
 		{"disable-obscure", no_argument,    0, 1},
 		{"disable-xor", no_argument,    0, 1},
+		{"disable-checksum", no_argument,    0, 1},
 		{"fix-latency", no_argument,    0, 1},
 		{"sock-buf", required_argument,    0, 1},
 		{"random-drop", required_argument,    0, 1},
@@ -849,6 +851,11 @@ void process_arg(int argc, char *argv[])
 				mylog(log_info,"xor disabled\n");
 				disable_xor=1;
 			}
+			else if(strcmp(long_options[option_index].name,"disable-checksum")==0)
+			{
+				disable_checksum=1;
+				mylog(log_warn,"checksum disabled\n");
+			}
 			else if(strcmp(long_options[option_index].name,"fix-latency")==0)
 			{
 				mylog(log_info,"fix-latency enabled\n");
diff --git a/misc.h b/misc.h
index 5a9d15d..a53639d 100644
--- a/misc.h
+++ b/misc.h
@@ -22,6 +22,7 @@ extern int mtu_warn;
 
 extern int disable_mtu_warn;
 extern int disable_fec;
+extern int disable_checksum;
 
 extern int debug_force_flush_fec;
 
diff --git a/packet.cpp b/packet.cpp
index 3da0dc2..523b40a 100644
--- a/packet.cpp
+++ b/packet.cpp
@@ -9,6 +9,7 @@
 #include "common.h"
 #include "log.h"
 #include "packet.h"
+#include "misc.h"
 
 int iv_min=4;
 int iv_max=32;//< 256;
@@ -324,6 +325,7 @@ int get_conv0(u32_t &conv,const char *input,int len_in,char *&output,int &len_ou
 }
 int put_crc32(char * s,int &len)
 {
+	if(disable_checksum)return 0;
 	assert(len>=0);
 	//if(len<0) return -1;
 	u32_t crc32=crc32h((unsigned char *)s,len);
@@ -336,6 +338,7 @@ int put_crc32(char * s,int &len)
 
 int do_cook(char * data,int &len)
 {
+	if(disable_checksum)return 0;
 	put_crc32(data,len);
 	if(!disable_obscure)do_obscure(data,len);
 	if(!disable_xor)encrypt_0(data,len,key_string);