Honeyd should be able to ignore packet checksums about honeyd HOT 5 OPEN

Another alternative that would be nice would be to ignore checksums for packets 
received on the loopback 
interface, but I can't figure out how to get a handle to the interface where 
the packet originated in the 
functions where the checksum is validated (tcp_recv_cb, udp_recv_cb, etc.).

For now, I have made this change to honeyd_input function to force calculation 
of the checksum for a packet 
received on a loopback device. This isn't the optimal solution because it 
causes checksums to be computed 
twice and validated when they should just be ignored, however it avoids having 
another command-line 
argument to avoid checksumming.

--- a/honeyd.c
+++ b/honeyd.c
@@ -3016,6 +3016,10 @@ honeyd_input(const struct interface *inter, struct ip_hdr
 *ip, u_short iplen)
    int delay = 0, flags = 0;
    struct addr src, addr;

+   if (inter->if_ent.intf_flags & INTF_FLAG_LOOPBACK) {
+       /* Override checksum on IP packet to prevent drops */
+       ip_checksum(ip, iplen);
+   }
    addr_pack(&addr, ADDR_TYPE_IP, IP_ADDR_BITS, &ip->ip_dst, IP_ADDR_LEN);
    if (!router_used) {
        /* Check if a template specific drop rate applies */

[deleted comment]

[email protected] I tried adding the four lines which you mentioned however it 
threw an error for me on ubuntu 12.04 with honeyd 1.5c

./configure went without an error

$ make
make  all-recursive
make[1]: Entering directory `/home/nobody/honeypot/honeyd-1.5c'
Making all in .
make[2]: Entering directory `/home/nobody/honeypot/honeyd-1.5c'
gcc -DHAVE_CONFIG_H -I. -I. -I. -I./ -I./compat -I/usr/local/include 
-I/usr/local/include -I/usr/local/include     -O2 -Wall -g 
-DPATH_HONEYDINCLUDE="\"/usr/local/include/honeyd\"" 
-DPATH_HONEYDDATA="\"/usr/local/share/honeyd\"" 
-DPATH_HONEYDLIB="\"/usr/local/lib/honeyd\"" -DHONEYD_PLUGINS_DECLARE="" 
-DHONEYD_PLUGINS="" -DPATH_RRDTOOL="\"\"" -c honeyd.c
In file included from stats.h:36:0,
                 from honeyd.c:98:
./compat/sha1.h:23:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:23:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:26:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:28:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:30:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:32:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:35:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:35:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
honeyd.c: In function ‘honeyd_input’:
honeyd.c:2844:2: error: invalid preprocessing directive #nobody
make[2]: *** [honeyd.o] Error 1
make[2]: Leaving directory `/home/nobody/honeypot/honeyd-1.5c'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/nobody/honeypot/honeyd-1.5c'
make: *** [all] Error 2
someone@somewhere:/home/nobody/honeypot/honeyd-1.5c$ 

The patch by  [email protected] did work.

how can i applay the patch
i get this error

$make
make  all-recursive
make[1]: Entering directory `/root/Downloads/honeyd-1.5c'
Making all in .
make[2]: Entering directory `/root/Downloads/honeyd-1.5c'
gcc -DHAVE_CONFIG_H -I. -I. -I. -I./ -I./compat -I/usr/local/include 
-I/usr/local/include -I/usr/local/include     -O2 -Wall -g 
-DPATH_HONEYDINCLUDE="\"/usr/local/include/honeyd\"" 
-DPATH_HONEYDDATA="\"/usr/local/share/honeyd\"" 
-DPATH_HONEYDLIB="\"/usr/local/lib/honeyd\"" -DHONEYD_PLUGINS_DECLARE="" 
-DHONEYD_PLUGINS="" -DPATH_RRDTOOL="\"/usr/bin/rrdtool\"" -c honeyd.c
In file included from honeyd.c:97:0:
tagging.h:89:6: error: expected declaration specifiers or ‘...’ before 
‘(’ token
tagging.h:89:6: error: expected declaration specifiers or ‘...’ before 
‘(’ token
In file included from stats.h:36:0,
                 from honeyd.c:98:
./compat/sha1.h:23:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:23:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:26:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:28:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:30:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:32:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:35:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
./compat/sha1.h:35:3: warning: ‘__bounded__’ attribute directive ignored 
[-Wattributes]
make[2]: *** [honeyd.o] Error 1
make[2]: Leaving directory `/root/Downloads/honeyd-1.5c'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/root/Downloads/honeyd-1.5c'
make: *** [all] Error 2