grumpyoldtroll / amt Goto Github PK

Running under valgrind found a problem:

amtgwd: exceeded max tries to send membership
==12== Invalid read of size 8
==12==    at 0x10C7F1: gw_request_timeout (gw_udp.c:184)
==12==    by 0x487DE67: ??? (in /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7.0.1)
==12==    by 0x487F8A6: event_base_loop (in /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7.0.1)
==12==    by 0x10AB35: main (gw_main.c:228)
==12==  Address 0x4adf1a0 is 0 bytes inside a block of size 128 free'd
==12==    at 0x484B27F: free (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==12==    by 0x10C7F0: gw_request_timeout (gw_udp.c:187)
==12==    by 0x487DE67: ??? (in /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7.0.1)
==12==    by 0x487F8A6: event_base_loop (in /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7.0.1)
==12==    by 0x10AB35: main (gw_main.c:228)
==12==  Block was alloc'd at
==12==    at 0x484DA83: calloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==12==    by 0x10D786: gw_request_get (gw_udp.c:59)
==12==    by 0x10D786: gw_request_start (gw_udp.c:814)
==12==    by 0x10E206: gw_receive_tun (gw_tun.c:415)
==12==    by 0x10E206: gw_event_tun (gw_tun.c:439)
==12==    by 0x487DF57: ??? (in /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7.0.1)
==12==    by 0x487F8A6: event_base_loop (in /usr/lib/x86_64-linux-gnu/libevent-2.1.so.7.0.1)
==12==    by 0x10AB35: main (gw_main.c:228)

Hey there,

I am currently trying to test the code on ubuntu following the instructions in testbed-setup/simpler-testbed.txt, and there is an issue when running the amdgwd file.

Whenever I run the file, the error "amtgwd: couldn't set tunnel veth3 mode to broadcast: Invalid argument" always appears. I have traced the error to line 158 of gateway/gw_tun.c, although I believe the issue may be related to a difference in how TUNSETIFF is run or something.

Here is some information about the system I am running:
Linux version 4.15.0-69-generic (buildd@lgw01-amd64-032) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #78-Ubuntu SMP Wed Nov 6 11:30:24 UTC 2019

I had to change some of the commands in the testbed-setup/simpler-testbed.txt file to get them to run. Namely, I had to change the commands to run each of the compiled files as follows:

sudo ip netns exec mrelay unbuffer /usr/local/bin/amtrelayd -n inet -l inet -c veth1 -s 10.3.3.1 -q1 -d -a "10.3.3.1/32"

sudo ip netns exec mrcv unbuffer /usr/local/bin/amtgwd -a 10.3.3.1 -c veth3 -d

Any idea what might be causing this problem?

Hey there,

I was just considering making the relay use a tunnel interface for our purposes, and I thought I might see if you knew what parts of the code need refactoring for that purpose? If not, I'll just keep looking around on my own.

Cheers