extra/libnet: new aport

Libnet is a high-level API (toolkit) allowing the application programmer
to construct and inject network packets.

http://www.packetfactory.net/libnet/

1 files changed, 27 insertions, 0 deletions

diff --git a/extra/libnet/libnet-1.1.2.1-fix-chksum.patch b/extra/libnet/libnet-1.1.2.1-fix-chksum.patch
new file mode 100644
index 00000000000..e6f9bbc6dd2
--- /dev/null
+++ b/extra/libnet/libnet-1.1.2.1-fix-chksum.patch
@@ -0,0 +1,27 @@
+Fix a bug in chksum calculation for odd sized UDP packets.
+
+http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=284729
+
+--- libnet-1.1.2.1/src/libnet_checksum.c
++++ libnet-1.1.2.1/src/libnet_checksum.c
+@@ -42,8 +42,10 @@
+ libnet_in_cksum(u_int16_t *addr, int len)
+ {
+     int sum;
++    u_int16_t last_byte;
+ 
+     sum = 0;
++    last_byte = 0;
+ 
+     while (len > 1)
+     {
+@@ -52,7 +54,8 @@
+     }
+     if (len == 1)
+     {
+-        sum += *(u_int16_t *)addr;
++        *(u_int8_t*)&last_byte = *(u_int8_t*)addr;
++        sum += last_byte;
+     }
+ 
+     return (sum);