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JsBergbau / BindToInterface

With this program you can bind applications to a specific network interface / network adapter. This is very useful if you have multiple (internet) connections and want your program to use a specific one.
GNU Affero General Public License v3.0
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Failed at step EXEC spawning BIND_INTERFACE=enp3s0: No such file or directory (running BTI as part of service) #5

Closed samsunix closed 1 year ago

samsunix commented 1 year ago

Hi and thank you, I been looking something like this for a while. I am trying to run this as part of service:

        [Unit]
        Description=Valheim Dedicated Server
        After=5mindelay.service

        [Service]
        ExecStartPre=/bin/rm -f /home/steam/valheim/start_server.sh
        ExecStartPre=/bin/cp /home/steam/conf/start_server.sh /home/steam/valheim/start_server.sh
        ExecStartPre=BIND_INTERFACE=enp3s0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/home/steam/BindToInterface/bindToInterface.so
        ExecStart=/bin/bash /home/steam/valheim/start_server.sh
        WorkingDirectory=/home/steam/valheim/
        StandardOutput=inherit
        StandardError=inherit
        User=steam

        [Install]
        WantedBy=multi-user.target

But output doesn't seem promising:

Sep 28 13:53:45 node2 systemd[1]: Starting Valheim Dedicated Server...
Sep 28 13:53:45 node2 systemd[2603]: valheim.service: Failed to locate executable BIND_INTERFACE=enp3s0: No such file or directory
Sep 28 13:53:45 node2 systemd[2603]: valheim.service: Failed at step EXEC spawning BIND_INTERFACE=enp3s0: No such file or directory
Sep 28 13:53:45 node2 systemd[1]: valheim.service: Control process exited, code=exited, status=203/EXEC
Sep 28 13:53:45 node2 systemd[1]: valheim.service: Failed with result 'exit-code'.
Sep 28 13:53:45 node2 systemd[1]: Failed to start Valheim Dedicated Server.
JsBergbau commented 1 year ago

Hi samsunix,

it tries to interpret your environment variable as executable. Here is how to use systemd unit files with environment variables https://flatcar-linux.org/docs/latest/setup/systemd/environment-variables/ Hope that helps.

samsunix commented 1 year ago

Hi JsBergbau and thank you for the reply and tips.

I got it now launching with the hint you gave me, thank you. Script runs but unfortunately my original problem still remains 🗡️

valheim.service now:

        [Unit]
        Description=Valheim Dedicated Server
        After=5mindelay.service

        [Service]
        Environment=BIND_INTERFACE=enp3s0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/home/steam/BindToInterface/bindToInterface.so
        ExecStartPre=/bin/rm -f /home/steam/valheim/start_server.sh
        ExecStartPre=/bin/cp /home/steam/conf/start_server.sh /home/steam/valheim/start_server.sh
        ExecStart=/bin/bash /home/steam/valheim/start_server.sh
        WorkingDirectory=/home/steam/valheim/
        StandardOutput=inherit
        StandardError=inherit
        User=steam

        [Install]
        WantedBy=multi-user.target

No error messages and at least some of the program ports are on correct device but... 

sudo netstat -peanut
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode      PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      0          25239      741/sshd: /usr/sbin
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      102        22063      655/systemd-resolve
**tcp        0      0 192.168.0.7:36681       155.133.230.34:27035    ESTABLISHED 1001       31280      1746/./valheim_serv**
tcp        0      0 192.168.0.6:22          192.168.0.11:51251      ESTABLISHED 0          25296      834/sshd: steam [pr
tcp        0      0 192.168.0.6:22          192.168.0.11:52243      ESTABLISHED 0          30214      1412/sshd: steam [p
tcp        0    352 192.168.0.6:22          192.168.0.11:52139      ESTABLISHED 0          30877      1334/sshd: samsunix
tcp        0      0 192.168.0.6:22          192.168.0.11:51371      ESTABLISHED 0          28955      1155/sshd: samsunix
tcp        0      0 192.168.0.6:56961       155.133.230.34:27032    ESTABLISHED 1001       28851      815/./ProjectZomboi
tcp6       0      0 :::27015                :::*                    LISTEN      1001       25464      815/./ProjectZomboi
tcp6       0      0 :::22                   :::*                    LISTEN      0          25241      741/sshd: /usr/sbin
udp        0      0 0.0.0.0:16261           0.0.0.0:*                           1001       25458      815/./ProjectZomboi
udp        0      0 127.0.0.53:53           0.0.0.0:*                           102        22062      655/systemd-resolve
udp        0      0 192.168.0.7:68          0.0.0.0:*                           101        25046      653/systemd-network
udp        0      0 192.168.0.6:68          0.0.0.0:*                           101        27575      653/systemd-network
**udp        0      0 0.0.0.0:2458            0.0.0.0:*                           1001       31267      1746/./valheim_serv
udp6       0      0 :::2457                 :::*                                1001       33099      1746/./valheim_serv**

For some reason I can't still connect the server.

C:\Users\samul>telnet 192.168.0.7 2457
Connecting To 192.168.0.7...Could not open connection to the host, on port 2457: Connect failed

Am I total idiot, what I am missing here?

JsBergbau commented 1 year ago

Are you trying that your server listens only on 192.168.0.7?

BIND_INTERFACE is only intended for outgoing traffic not for listening traffic since most programs allow you to specify the listening address like 127.0.0.1, 0.0.0.0 for all interfaces or in your case 192.168.0.7.

But based on your netstat output valheim_serv listens only on udp. You can't connect with telnet to UDP ports. You could try with nc (netcat), but without knowing wheter the server will respond anything without the right packets sent you can't really test that.

You can have a look at the micrsocks example https://github.com/JsBergbau/BindToInterface#microsocks

In your case I would first try to get it running without systemd, because systemd behaves sometimes special/different.

samsunix commented 1 year ago

I am trying to setup it so both programs are using different interfaces

Valheim should listen and send trough 192.168.0.7 and Zomboid 192.168.0.6 (because two gigabit ethernet's so why not? -right?)

Currently I am able to join Valheim server but now Zomboid is out of game: 

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode      PID/Program name
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      102        22016      653/systemd-resolve
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      0          26343      731/sshd: /usr/sbin
tcp        0     64 192.168.0.6:22          192.168.0.11:65460      ESTABLISHED 0          29746      1195/sshd: samsunix
tcp        0      0 192.168.0.7:38843       155.133.230.50:27031    ESTABLISHED 1001       26406      813/./ProjectZomboi
tcp        0      0 192.168.0.7:37599       155.133.230.50:27019    ESTABLISHED 1001       29703      715/./valheim_serve
tcp6       0      0 :::22                   :::*                    LISTEN      0          26345      731/sshd: /usr/sbin
tcp6       0      0 :::27015                :::*                    LISTEN      1001       28166      813/./ProjectZomboi
udp        0      0 0.0.0.0:2457            0.0.0.0:*                           1001       28896      715/./valheim_serve
udp        0      0 0.0.0.0:16261           0.0.0.0:*                           1001       28160      813/./ProjectZomboi
udp        0      0 127.0.0.53:53           0.0.0.0:*                           102        22015      653/systemd-resolve
udp        0      0 192.168.0.6:68          0.0.0.0:*                           101        26210      651/systemd-network
udp        0      0 192.168.0.7:68          0.0.0.0:*                           101        26197      651/systemd-network
udp6       0      0 :::2456                 :::*                                1001       27635      715/./valheim_serve

That said, it seems I am able to join zomboid also but only by local ip 192.168.0.6 Most likely because of this line: tcp 0 0 192.168.0.7:38843 155.133.230.50:27031 ESTABLISHED 1001 26406 813/./ProjectZomboi

samsunix commented 1 year ago

Got it working. I had wrong interface name on my zomboid.service ^-^'

Thank you for the help and extended support.

JsBergbau commented 1 year ago

I'm glad that it works as intented.

BTW: If you're only using it because you have two NICs you should consider using NIC-Teaming / bonding. Depeding on your distribution there are multiple ways to accomplish this. For ubuntu server Iused this tutorial https://getlabsdone.com/how-to-configure-bonding-using-netplan/