listen_interfaces and tracker_errors.

[i96751414]

libtorrent version (or branch):
1.2.19

platform/architecture:
Linux arm64

Hi @arvidn,

I have one question that is puzzling me a bit. I have been using libtorrent for years and never had to configure listen_interfaces for it to work - the default value has been working so far.

Recently I started doing some tests with libtorrent on a RPi 5 and it simply doesn't work with the default values. I see a lot of 'tracker_errors' with "Host not found (non-authoritative)" although I have 'listen_succeeded' alert. At first glance I thought it would be a DNS problem, but it is not. If I set my local IP address (192.168.1.x) in listen_interfaces it starts working; If i set the device name (wlan0) it doesn't work (in this case I don't even receive a 'listen_succeeded/failed' alert). What could be the reason for this? Might it be related with my local network configuration?

Thanks in advance!

[i96751414]

After some testing I realised libtorrent is not able to see my interfaces. The bellow code produces the following output:

    libtorrent::io_service ioContext;
    libtorrent::error_code errorCode;
    auto ifaces = libtorrent::enum_net_interfaces(ioContext, errorCode);
    for (auto &iface : ifaces)
        std::cout << iface.name << " : " << iface.interface_address << std::endl;

output:

lo : 127.0.0.1
lo : ::1

wlan0 is not listed here... Not sure if this is intended?
I can workaround this by adding code to find interfaces and their IPs at my end, but it would be nice to have libtorrent doing it.

[arvidn]

could you try building and running the enum_if test program? e.g.

cd tests
b2 link=static stage_enum_if
./enum_if

It prints something like this:

=========== Routes ===========
destination                                  network                                      gateway                            mtu    source-hint       interface
0.0.0.0                                      0.0.0.0                                      192.168.12.1                       0      -                 en0
127.0.0.0                                    255.0.0.0                                    127.0.0.1                          0      127.0.0.1         lo0
========= Interfaces =========
address                           netmask                                      name                gateway             state          flags               description
127.0.0.1                         255.0.0.0                                    lo0                 -                   unknown        UP LOOP RUN MULTICAST
::1                               ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff      lo0                 -                   unknown        UP LOOP RUN MULTICAST
fe80::1%lo0                       ffff:ffff:ffff:ffff::                        lo0                 -                   unknown        UP LOOP RUN MULTICAST
fe80::a078:17ff:fe8a:d838%ap1     ffff:ffff:ffff:ffff::                        ap1                 -                   unknown        UP BROADCAST RUN MULTICAST
fe80::14d1:8a1:79c3:4d62%en0      ffff:ffff:ffff:ffff::                        en0                 -                   unknown        UP BROADCAST RUN MULTICAST
192.168.12.27                     255.255.255.0                                en0                 192.168.12.1        unknown        UP BROADCAST RUN MULTICAST
fe80::488:7fff:fe44:9732%awdl0    ffff:ffff:ffff:ffff::                        awdl0               -                   unknown        UP BROADCAST RUN MULTICAST
fe80::488:7fff:fe44:9732%llw0     ffff:ffff:ffff:ffff::                        llw0                -                   unknown        UP BROADCAST RUN MULTICAST

[i96751414]

This is the result I have on 2.0.10 and 1.2.19:

=========== Routes ===========
destination                                  network                                      gateway                            mtu    source-hint       interface
0.0.0.0                                      0.0.0.0                                      192.168.1.254                      1500   -                 wlan0
192.168.1.0                                  255.255.255.0                                -                                  1500   192.168.1.139     wlan0
127.0.0.0                                    255.0.0.0                                    -                                  65536  127.0.0.1         lo
127.0.0.1                                    255.255.255.255                              -                                  65536  127.0.0.1         lo
127.255.255.255                              255.255.255.255                              -                                  65536  127.0.0.1         lo
192.168.1.139                                255.255.255.255                              -                                  1500   192.168.1.139     wlan0
192.168.1.255                                255.255.255.255                              -                                  1500   192.168.1.139     wlan0
2001:8a0:e4ba:4901::                         ffff:ffff:ffff:ffff::                        -                                  1500   -                 wlan0
2001:8a0:e4ba:4900::                         ffff:ffff:ffff:ff00::                        fe80::a691:b1ff:fef0:dd9c%wlan0    1500   -                 wlan0
fe80::                                       ffff:ffff:ffff:ffff::                        -                                  1500   -                 wlan0
::                                           ::                                           fe80::a691:b1ff:fef0:dd9c%wlan0    1500   -                 wlan0
::1                                          ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff      -                                  65536  -                 lo
2001:8a0:e4ba:4901:53f0:408d:1c7e:5063       ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff      -                                  1500   -                 wlan0
fe80::3b56:58fa:517a:8387                    ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff      -                                  1500   -                 wlan0
ff00::                                       ff00::                                       -                                  1500   -                 wlan0
========= Interfaces =========
address                           netmask                                      name                gateway             state          flags               description
127.0.0.1                         255.0.0.0                                    lo                  -                   unknown        UP LOOP RUN          
::1                               ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff      lo                  -                   unknown        UP LOOP RUN