UDP --badsum fix

2026-01-03 05:09:14 +00:00 · 2007-01-23 03:28:03 +00:00
parent a869a1df8f
commit d26e54847b
1 changed files with 3 additions and 1 deletions
--- a/osscan.cc
+++ b/osscan.cc
@@ -171,8 +171,10 @@ for(decoy=0; decoy < o.numdecoys; decoy++) {
  udp->uh_sum = realcheck;
 #endif

-  if ( o.badsum )
+  if ( o.badsum ) {
    udp->uh_sum++;
+    if (udp->uh_sum == 0) udp->uh_sum = 0xffff; // UDP checksum=0 means no checksum
+  }

  /* Now for the ip header */
  ip->ip_v = 4;