Update goodbyedpi.c

src/goodbyedpi.c

@@ -213,7 +213,7 @@ static void add_maxpayloadsize_str(unsigned short maxpayload) {
     const char *maxpayloadsize_str = "and (tcp.PayloadLength ? tcp.PayloadLength < %hu or tcp.Payload32[0] == 0x47455420 or tcp.Payload32[0] == 0x504F5354 : true)";
     char *addfilter;
 
-    asprintf(&addfilter, "%s", maxpayloadsize_str, maxpayload);
+    asprintf(&addfilter, maxpayloadsize_str, maxpayload);
 
     char *newstr = repl_str(filter_string, MAXPAYLOADSIZE_TEMPLATE, addfilter);
     free(filter_string);
@@ -222,7 +222,6 @@ static void add_maxpayloadsize_str(unsigned short maxpayload) {
 }
 
 
-
 static void finalize_filter_strings() {
     char *newstr = repl_str(filter_string, IPID_TEMPLATE, "");
     free(filter_string);
@@ -391,7 +390,7 @@ static int extract_sni(const char *pktdata, unsigned int pktlen,
     while (ptr + 8 < pktlen) {
         if (d[ptr] == '\0' && d[ptr+1] == '\0' && d[ptr+2] == '\0' &&
             d[ptr+4] == '\0' && d[ptr+6] == '\0' && d[ptr+7] == '\0' &&
-            (d[ptr+3] ^ d[ptr+5]) == 2 && (d[ptr+5] ^ d[ptr+8]) == 3)
+            d[ptr+3] - d[ptr+5] == 2 && d[ptr+5] - d[ptr+8] == 3)
         {
             hnaddr = &d[ptr+9];
             hnlen = d[ptr+8];
@@ -420,7 +419,6 @@ static int extract_sni(const char *pktdata, unsigned int pktlen,
 }
 
 
-
 static inline void change_window_size(const PWINDIVERT_TCPHDR ppTcpHdr, unsigned int size) {
     if (size >= 1 && size <= 0xFFFFu) {
         ppTcpHdr->Window = htons((u_short)size);