Hi Satish, If the LD_PRELOAD env variable is only set when starting the application, only that application’s syscalls are intercepted. Also note that we don’t intercept all syscalls (check ldp.c for more details). So yes, the architecture in your diagram should be possible.
Regards, Florin > On Jul 22, 2021, at 9:35 AM, satish amara <satishkam...@gmail.com> wrote: > > Hi Florin, > Thanks! It mentions setting some config files and env variables. The > LDP_PATH sets the path libvcl_ldpreload.so > I am trying to understand the logistics. Once I do that does mean all > networking applications on the host try to use LDP if they can. > I don't have any application-specific config. Please look into my attached > diagram. Do I have the ability to tell only specific apps to use LDP. This > is for cases where I don't want to rewrite the socket API. > > Thanks, > Satish K Amara > > > > On Thu, Jul 22, 2021 at 10:36 AM Florin Coras <fcoras.li...@gmail.com > <mailto:fcoras.li...@gmail.com>> wrote: > Hi Satish, > > You can find an example of how to use Nginx with LDP here [1]. In general you > can find host stack documentation here [2]. > > Regards, > Florin > > [1] https://wiki.fd.io/view/VPP/HostStack/LDP/nginx > <https://wiki.fd.io/view/VPP/HostStack/LDP/nginx> > [2] https://wiki.fd.io/view/VPP/HostStack > <https://wiki.fd.io/view/VPP/HostStack> > > >> On Jul 22, 2021, at 7:27 AM, satish amara <satishkam...@gmail.com >> <mailto:satishkam...@gmail.com>> wrote: >> >> Hi, >> I see we have a couple of options for user applications to use the VPP >> TCP/IP stack. Either by VCL or LD_PRELOAD. I am trying to understand if we >> can selectively intercept syscalls and injects them into VLS for specific >> applications. Is LD_PRELOAD can application specific. If so what is the >> procedure? >> >> Thanks, > > <PacketFlowpng.png>
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