Understanding the router's FB wifi source code

[hanusiak]

Hello,

I'm just starting to dig around in the source code of Merlin.
I'm trying to get my head around the FB wificode and how it handles the communication with facebook.

I started by looking at the router/rc/lan.c where FB is handled:
#ifdef RTCONFIG_FBWIFI
void stop_fbwifi_check()
{
killall("fb_wifi_check", SIGTERM);
}
void start_fbwifi_check()
{
char *fbwifi_argv[] = {"fb_wifi_check",NULL};
pid_t pid;

_eval(fbwifi_argv, NULL, 0, &pid);
}

void restart_fbwifi_register()
{
char *fbwifi_argv[] = {"fb_wifi_register",nvram_get("wl_unit"),nvram_get("wl_subunit"),NULL};
pid_t pid;

_eval(fbwifi_argv, NULL, 0, &pid);
}
#endif

The first hurdle that I found was that I could not find anywhere the definition of fb_wifi_check or fb_wifi_register.

I found in router/Makefile following section:
#fbwifi
fb_wifi/stamp-h1:
touch $@

fb_wifi: curl fb_wifi/stamp-h1
@$(MAKE) -C fb_wifi

fb_wifi-install: fb_wifi
@$(SEP)
install -D fb_wifi/fb_wifi_check $(INSTALLDIR)/fb_wifi/usr/sbin/fb_wifi_check
install -D fb_wifi/fb_wifi_register $(INSTALLDIR)/fb_wifi/usr/sbin/fb_wifi_register
install -D fb_wifi/libfbwifi.so $(INSTALLDIR)/fb_wifi/usr/lib/libfbwifi.so
$(STRIP) $(INSTALLDIR)/fb_wifi/usr/sbin/fb_wifi_check
$(STRIP) $(INSTALLDIR)/fb_wifi/usr/sbin/fb_wifi_register
$(STRIP) $(INSTALLDIR)/fb_wifi/usr/lib/libfbwifi.so

fb_wifi-clean:
-@$(MAKE) -C fb_wifi clean
rm -rf fb_wifi/stamp-h1


I somehow have the feeling that these are proprietary utils maybe from facebook. I searched through the git repository but to no avail ... I can not find any definition of these utils

Who can help ?

Peter

 

[ColinTaylor]

I believe that code is obsolete. Asus stopped supporting it years ago so it's possible that parts of the code aren't included anymore.

[Facebook Wi-Fi] How to set up Facebook Wi-Fi on ASUS routers? | Official Support | ASUS USA

 

[SomeWhereOverTheRainBow]

I believe that code is obsolete. Asus stopped supporting it years ago so it's possible that parts of the code aren't included anymore.

[Facebook Wi-Fi] How to set up Facebook Wi-Fi on ASUS routers? | Official Support | ASUS USA

I can tell you it is pretty active via my PIHOLE. I see the traffic coming from the Router.

This is coming straight from the router, (not a separate client via the router.). Why does Asuswrt need to request DNS from graph.facebook-hardware.com?

 

[ColinTaylor]

Do you have an Oculus Headset?

 

[hanusiak]

I believe that code is obsolete. Asus stopped supporting it years ago so it's possible that parts of the code aren't included anymore.

[Facebook Wi-Fi] How to set up Facebook Wi-Fi on ASUS routers? | Official Support | ASUS USA

I see what you are saying, however it is odd that fb_wifi code was added into Merlin since Dec 28, 2016 and since that time is still there. Nobody removed it.
I found it here in this commit. Merged with GPL 380_4180 (missing MIPS and AC3200 binary blobs) · RMerl/asuswrt-merlin@2ade828 · GitHub

fb_wifi tools are still missing. Where do they come from?

 

[underdose]

I see what you are saying, however it is odd that fb_wifi code was added into Merlin since Dec 28, 2016 and since that time is still there. Nobody removed it.
I found it here in this commit. Merged with GPL 380_4180 (missing MIPS and AC3200 binary blobs) · RMerl/asuswrt-merlin@2ade828 · GitHub

fb_wifi tools are still missing. Where do they come from?

That's the old repository for 380 which is not maintained anymore. RMerlin moved to a newer code base and here's the repository for it: https://github.com/RMerl/asuswrt-merlin.ng