LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored

[Joecowboy]

I know telephathy-ofono is already registered. I just have to kill it's process to get around it.
I am getting the following error trying to LD_PRELOAD:

BIND_INTERFACE=rmnet_data0 LD_PRELOAD=./bindToInterface.so /usr/lib/telepathy/telepathy-ofono
ERROR: ld.so: object './bindToInterface.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Protocol.Interface.Addressing" plugged
tp-qt 0.9.7 DEBUG: Protocol "ofono" added to CM
tp-qt 0.9.7 DEBUG: Registering protocol "ofono" at path "/org/freedesktop/Telepathy/ConnectionManager/ofono/ofono" for CM "/org/freedesktop/Telepathy/ConnectionManager/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 WARN: Unable to register object "/org/freedesktop/Telepathy/ConnectionManager/ofono/ofono" - path already registered

[JsBergbau]

Hi Joecowboy,
try an absolute path to bindToInterface.so, then it should work.

Can you shortly describe what telephathy-ofono is? There is no readme and no description. I'm just curious.

[Joecowboy]

Hello JsBergbau,

Telepathy-ofono (from the ofono platform) is basically man in the middle app between android layer and ubports (Ubuntu Touch -- Ubuntu 16.04) for mms on my phone. I am trying to figure out a way while I have WiFi enabled I can still send and receive pics, videos, emojis, ect. and have it routed to the cell network interface (rmnet_data0) only. As it stands if WiFi is enabled and Cell Network Data is enabled; sending and receiving files via mms will error but texting is fine. Disable Wifi everything works flawlessly. Even if I run the following command with sudo I still get the same error. Also, I cannot use IPtables because -m cgroup because match with cgroup is not enabled in the kernel. So I am looking at your solution.

I am getting the same error with LD_PRELOAD:

phablet@ubuntu-phablet:~/Downloads$ BIND_INTERFACE=rmnet_data0 LD_PRELOAD=/home/phablet/Downloads/bindToInterface.so /usr/lib/telepathy/telepathy-ofono
ERROR: ld.so: object '/home/phablet/Downloads/bindToInterface.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Protocol.Interface.Addressing" plugged
tp-qt 0.9.7 DEBUG: Protocol "ofono" added to CM
tp-qt 0.9.7 DEBUG: Registering protocol "ofono" at path "/org/freedesktop/Telepathy/ConnectionManager/ofono/ofono" for CM "/org/freedesktop/Telepathy/ConnectionManager/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 WARN: Unable to register service "org.freedesktop.Telepathy.ConnectionManager.ofono" - name already registered by another process

[JsBergbau]

It may be possible that telepathy-ofono runs under a different user account or drops some rights. So it could be possible that telepathy-ofono can't access bindToInterface.so in /home/phablet/Downloads.
Try placing it in /opt/bindToInterface.so and grant user, group and other read and executable access.

[Joecowboy]

Okay, here is killing the pid of telepathy-ofono with it copied to /opt as you suggested but as you notice the ERROR is still there. Do you have a way to compile this for Ubuntu 16.04 for testing?:

phablet@ubuntu-phablet:$ pidof telepathy-ofono
6555
phablet@ubuntu-phablet:$ kill 6555
phablet@ubuntu-phablet:~$ BIND_INTERFACE=rmnet_data0 LD_PRELOAD=/opt/bindToInterface.so /usr/lib/telepathy/telepathy-ofono
ERROR: ld.so: object '/opt/bindToInterface.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Protocol.Interface.Addressing" plugged
tp-qt 0.9.7 DEBUG: Protocol "ofono" added to CM
tp-qt 0.9.7 DEBUG: Registering protocol "ofono" at path "/org/freedesktop/Telepathy/ConnectionManager/ofono/ofono" for CM "/org/freedesktop/Telepathy/ConnectionManager/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 DEBUG: Registered object "/org/freedesktop/Telepathy/ConnectionManager/ofono/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 DEBUG: Registering CM "/org/freedesktop/Telepathy/ConnectionManager/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 DEBUG: Registered object "/org/freedesktop/Telepathy/ConnectionManager/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.Requests" plugged
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.SimplePresence" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.EmergencyMode" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.Voicemail" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.USSD" plugged
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("")
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.Contacts" plugged
tp-qt 0.9.7 DEBUG: cmName: "ofono" escapedProtocolName: "ofono" name: "connection_f242b77f97597add8f36d0bf79847dda"
tp-qt 0.9.7 DEBUG: busName: "org.freedesktop.Telepathy.Connection.ofono.ofono.connection_f242b77f97597add8f36d0bf79847dda" objectName: "/org/freedesktop/Telepathy/Connection/ofono/ofono/connection_f242b77f97597add8f36d0bf79847dda"
tp-qt 0.9.7 DEBUG: Connection: registering interfaces at Tp::DBusObject(0x338694b0)
tp-qt 0.9.7 DEBUG: Registered object "/org/freedesktop/Telepathy/Connection/ofono/ofono/connection_f242b77f97597add8f36d0bf79847dda" at bus name "org.freedesktop.Telepathy.Connection.ofono.ofono.connection_f242b77f97597add8f36d0bf79847dda"
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.Requests" plugged
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.SimplePresence" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.EmergencyMode" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.Voicemail" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.USSD" plugged
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("-----------")
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.Contacts" plugged
tp-qt 0.9.7 DEBUG: cmName: "ofono" escapedProtocolName: "ofono" name: "connection_a747d1c01780dde754c6574aaecdc20f"
tp-qt 0.9.7 DEBUG: busName: "org.freedesktop.Telepathy.Connection.ofono.ofono.connection_a747d1c01780dde754c6574aaecdc20f" objectName: "/org/freedesktop/Telepathy/Connection/ofono/ofono/connection_a747d1c01780dde754c6574aaecdc20f"
tp-qt 0.9.7 DEBUG: Connection: registering interfaces at Tp::DBusObject(0x338a0660)
tp-qt 0.9.7 DEBUG: Registered object "/org/freedesktop/Telepathy/Connection/ofono/ofono/connection_a747d1c01780dde754c6574aaecdc20f" at bus name "org.freedesktop.Telepathy.Connection.ofono.ofono.connection_a747d1c01780dde754c6574aaecdc20f"
tp-qt 0.9.7 DEBUG: BaseConnection::status = 2 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 2 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 2 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 2 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 2 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 2 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnection::status = 2 oFonoConnection(0x338a0b50)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 WARN: BaseConnectionSimplePresenceInterface::Adaptee::setPresence: status is not in statuses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
oFonoConnection::connect
tp-qt 0.9.7 DEBUG: BaseConnection::setStatus 0 1 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 WARN: BaseConnectionSimplePresenceInterface::Adaptee::setPresence: status is not in statuses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
oFonoConnection::connect
tp-qt 0.9.7 DEBUG: BaseConnection::setStatus 0 1 oFonoConnection(0x338a0b50)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x338a0b50)
getContactAttributes (1) ()
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("")
getContactAttributes (1) ()
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("-----------")
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x338a0b50)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x338a0b50)
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x338a0b50)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x338a0b50)
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("-----------")
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x3387dd10)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnection::status = 0 oFonoConnection(0x338a0b50)
tp-qt 0.9.7 WARN: BaseConnectionSimplePresenceInterface::Adaptee::setPresence: status is not in statuses
tp-qt 0.9.7 WARN: BaseConnectionSimplePresenceInterface::Adaptee::setPresence: status is not in statuses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("")
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("-----------")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("-----------")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("-----------")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("-----------")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles ("")
oFonoConnection::onMMSServiceAdded "/org/ofono/mms/310410965737678"

[JsBergbau]

Very strange: Can you please try BIND_INTERFACE=rmnet_data0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/opt/bindToInterface.so curl ifconfig.me and see if you get the IP address of your mobile connection?

[JsBergbau]

Found something useful https://linux.die.net/man/8/ld-linux

LD_PRELOAD
(...) For set-user-ID/set-group-ID ELF binaries, preload pathnames containing slashes are ignored, and libraries in the standard search directories are loaded only if the set-user-ID permission bit is enabled on the library file.

So if I understand this correctly: If telepathy-ofono uses set-user-ID and/or set-group-ID LD_PRELOAD will only work if it is in a standard search directory. According to this https://unix.stackexchange.com/a/22999/334883 that are

In a nutshell, when it's looking for a dynamic library (.so file) the linker tries:

directories listed in the LD_LIBRARY_PATH environment variable (DYLD_LIBRARY_PATH on OSX);
directories listed in the executable's rpath;
directories on the system search path, which (on Linux at least) consists of the entries in /etc/ld.so.conf plus /lib and /usr/lib.

If done chmod ug+s bindToInterface.so and put it into /lib and tried BIND_INTERFACE=ovpnLD_PRELOAD=bindToInterface.so curl ifconfig.me but this didn't work

cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf

cat /etc/ld.so.conf.d/arm-linux-gnueabihf.conf
# Multiarch support
/usr/local/lib/arm-linux-gnueabihf
/lib/arm-linux-gnueabihf
/usr/lib/arm-linux-gnueabihf

Also put library to /usr/lib/arm-linux-gnueabihf but still this didn't work with curl, so standard searchpath seems to be ignored.

So if the curl example BIND_INTERFACE=rmnet_data0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/opt/bindToInterface.so curl ifconfig.me works, please still try putting it into a path in /etc/ld.so.conf and then try loading it by the simple example BIND_INTERFACE=rmnet_data0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=bindToInterface.so curl ifconfig.me. If then the same error occurs, I suggest asking at stackoverflow whats wrong here. Sorry my knowledge about Preloading is quite limited. On windows it is even harder. There you need some framework like detours https://en.wikipedia.org/wiki/Microsoft_Detours to do so.

[Joecowboy]

I moved bindToInterface.so from /opt to /lib then chmod ug+s on the file and tried your curl requests. The error still persists as you can see from the last two outputs. Thank you for your time and trying to figure this out.

cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf

cat /etc/ld.so.conf.d/aarch64-linux-gnu.conf
# Multiarch support
/lib/aarch64-linux-gnu
/usr/lib/aarch64-linux-gnu

root@ubuntu-phablet:/lib# BIND_INTERFACE=ovpn LD_PRELOAD=bindToIntelibce.so curl ifconfig.me
ERROR: ld.so: object 'bindToIntelibce.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
"IP ADDRESS OUTPUT"

root@ubuntu-phablet:/lib# BIND_INTERFACE=rmnet_data0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/lib/bindToInterface.so curl ifconfig.me
ERROR: ld.so: object '/lib/bindToInterface.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
"IP ADDRESS OUTPUT"

[JsBergbau]

Thanks for the output. So this problem has primarily nothing to do with telephathy-ofono.

Did you compile bindInterface.so on that machine?

Please post output of file bindToInterface.so and output of arch.

[Joecowboy]

No I didn't, because it's my phone and no gcc compiler. I compiled it on an another ubuntu box.

[JsBergbau]

That should be the issue. You compiled for another architecture and thats why it can't be loaded.
You need to crosscompile the the file for the architecture of your phone.

[Joecowboy]

I thought about that too. I guess I can try and install gcc on the phone and report back.

[Joecowboy]

Ok I installed gcc and libc6-dev to compile your project. I compiled it without any errors on the phone now. However, I am still receiving the ERROR. Do you have any other ideas?:

BIND_INTERFACE=ovpn LD_PRELOAD=/usr/local/lib/bindToIntelibce.so curl ifconfig.me
ERROR: ld.so: object '/usr/local/lib/bindToIntelibce.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
"IP ADDRESS OUTPUT"

[JsBergbau]

Please try this line BIND_INTERFACE=rmnet_data0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/lib/bindToInterface.so curl ifconfig.me
ovpn is an example, I don't think you have that interface and there is a typo in the library name bindToIntelibce.so

[Joecowboy]

Here is the output from what you wanted me to try with "NO" ERROR:

BIND_INTERFACE=rmnet_data0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/lib/bindToInterface.so curl ifconfig.me
curl: (6) Could not resolve host: ifconfig.me

However, I am still getting the ERROR with telepathy-ofono. Do you have anymore thoughts. I thought about moving it to /system/lib to see if that would make a difference.:

BIND_INTERFACE=rmnet_data0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/lib/bindToInterface.so /usr/lib/telepathy/telepathy-ofono
ERROR: ld.so: object '/lib/bindToInterface.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Protocol.Interface.Addressing" plugged
tp-qt 0.9.7 DEBUG: Protocol "ofono" added to CM
tp-qt 0.9.7 DEBUG: Registering protocol "ofono" at path "/org/freedesktop/Telepathy/ConnectionManager/ofono/ofono" for CM "/org/freedesktop/Telepathy/ConnectionManager/ofono" at bus name "org.freedes
ktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 DEBUG: Registered object "/org/freedesktop/Telepathy/ConnectionManager/ofono/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 DEBUG: Registering CM "/org/freedesktop/Telepathy/ConnectionManager/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 DEBUG: Registered object "/org/freedesktop/Telepathy/ConnectionManager/ofono" at bus name "org.freedesktop.Telepathy.ConnectionManager.ofono"
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.Requests" plugged
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.SimplePresence" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.EmergencyMode" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.Voicemail" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.USSD" plugged
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("-----------")
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.Contacts" plugged
tp-qt 0.9.7 DEBUG: cmName:  "ofono"  escapedProtocolName:  "ofono"  name: "connection_7747c8e6360b95f1b9592cf38bcb9d6f"
tp-qt 0.9.7 DEBUG: busName:  "org.freedesktop.Telepathy.Connection.ofono.ofono.connection_7747c8e6360b95f1b9592cf38bcb9d6f"  objectName:  "/org/freedesktop/Telepathy/Connection/ofono/ofono/connection
_7747c8e6360b95f1b9592cf38bcb9d6f"
tp-qt 0.9.7 DEBUG: Connection: registering interfaces  at  Tp::DBusObject(0x3a5ae4b0)
tp-qt 0.9.7 DEBUG: Registered object "/org/freedesktop/Telepathy/Connection/ofono/ofono/connection_7747c8e6360b95f1b9592cf38bcb9d6f" at bus name "org.freedesktop.Telepathy.Connection.ofono.ofono.conn
ection_7747c8e6360b95f1b9592cf38bcb9d6f"
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.Requests" plugged
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.SimplePresence" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.EmergencyMode" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.Voicemail" plugged
tp-qt 0.9.7 DEBUG: Interface "com.canonical.Telephony.USSD" plugged
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("")
tp-qt 0.9.7 DEBUG: Interface "org.freedesktop.Telepathy.Connection.Interface.Contacts" plugged
tp-qt 0.9.7 DEBUG: cmName:  "ofono"  escapedProtocolName:  "ofono"  name: "connection_587b5b8ee5989f8ddd717274d81aec13"
tp-qt 0.9.7 DEBUG: busName:  "org.freedesktop.Telepathy.Connection.ofono.ofono.connection_587b5b8ee5989f8ddd717274d81aec13"  objectName:  "/org/freedesktop/Telepathy/Connection/ofono/ofono/connection
_587b5b8ee5989f8ddd717274d81aec13"
tp-qt 0.9.7 DEBUG: Connection: registering interfaces  at  Tp::DBusObject(0x3a5ea6f0)
tp-qt 0.9.7 DEBUG: Registered object "/org/freedesktop/Telepathy/Connection/ofono/ofono/connection_587b5b8ee5989f8ddd717274d81aec13" at bus name "org.freedesktop.Telepathy.Connection.ofono.ofono.conn
ection_587b5b8ee5989f8ddd717274d81aec13"
tp-qt 0.9.7 DEBUG: BaseConnection::status =  2   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  2   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  2   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  2   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  2   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  2   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  2   oFonoConnection(0x3a5ea7a0)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 WARN: BaseConnectionSimplePresenceInterface::Adaptee::setPresence: status is not in statuses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
oFonoConnection::connect
tp-qt 0.9.7 DEBUG: BaseConnection::setStatus  0   1   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 WARN: BaseConnectionSimplePresenceInterface::Adaptee::setPresence: status is not in statuses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
oFonoConnection::connect
tp-qt 0.9.7 DEBUG: BaseConnection::setStatus  0   1   oFonoConnection(0x3a5ea7a0)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5ea7a0)
getContactAttributes (1) ()
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("-----------")
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5ea7a0)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5ea7a0)
getContactAttributes (1) ()
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("")
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5ea7a0)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5ea7a0)
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("-----------")
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 WARN: BaseConnectionSimplePresenceInterface::Adaptee::setPresence: status is not in statuses
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("")
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("-----------")
tp-qt 0.9.7 WARN: BaseConnectionSimplePresenceInterface::Adaptee::setPresence: status is not in statuses
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5ea7a0)
tp-qt 0.9.7 DEBUG: BaseConnection::status =  0   oFonoConnection(0x3a5c2d10)
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("")
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
tp-qt 0.9.7 DEBUG: BaseConnectionRequestsInterface::requestableChannelClasses
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("-----------")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("-----------")
getContactAttributes (1) ("org.freedesktop.Telepathy.Connection.Interface.SimplePresence")
oFonoConnection::inspectHandles contact (1)
oFonoConnection::inspectHandles  ("-----------")

[JsBergbau]

BIND_INTERFACE=rmnet_data0 DNS_OVERRIDE_IP=8.8.8.8 LD_PRELOAD=/lib/bindToInterface.so curl ifconfig.me
curl: (6) Could not resolve host: ifconfig.me

That looks better now. However resolving should work. Lets focus on getting this working first and than look regarding telepathy-ofono

Try to use the DNS-Server of your provider in DNS_OVERRIDE_IP and see if you get the IP of your mobile data connection. If not please please uncomment line 13 in bindToInterface.c so debugging is enabled
https://github.com/JsBergbau/BindToInterface/blob/main/bindToInterface.c#L13

Then please compile again and execute again the example with curl and your provider DNS and post the output here.