c++ - NAT-Traversal implementation for P2P connection -


i need implement simple p2p application behind nats. should send data on reliable , secure connection (encrypted data on tcp). theoretical background know there several nat-traversal techniques (for example session traversal utilities nat) described in several rfcs (5389, 5769, , 5780).

though in practice can't find needed tools/libraries implement such system (preferably in c++ programming language). found googling around blindly: ice, turn, libnice, libjingle , stuntman

below image describes should like. have vps valid ip address, pc behind nat , sensor behind nat. have private ips. want sensor connect server, find monitor , send connection request it. after connection establishment, relay server should not used direct traffic of data. want sensor , monitor use path communicate:

sensor <--> ap0 <--> r3 <--> {the internet} <--> r2 <--> monitor

currently data transmitted through vps:

sensor <--> ap0 <--> r3 <--> {the internet} r1 <-->  vps <--> r1 <--> {the internet} <--> r2 <--> monitor

network

‌

basically, if can port forward, more of infrastructure question programming. need configure routers direct traffic public ip / port private ip / port, e.g.:

r2: port 500 - tcp -> laptop-pt - port 500 r3: ports 16000/16500 - tcp/udp -> pda-pt - port 16000/16500

if want fancy , routers support upnp, resort library implements igd protocol (e.g., miniupnp), in order make application control port mapping. this article provides starting point sample code (although recommend robust library).


Comments

Post a Comment

Popular posts from this blog

linux - Does gcc have any options to add version info in ELF binary file? -

i mean whether gcc can insert source code version infor elf binary section or similar. not want change source file, add info gcc option in makefile. you can emit version info text file, turn text file object file statically link executable. the first step simple have write code: script or write version info in format plain text file. write makefile rule produce version.o version.txt, using objcopy . you'll have object file 2 useful symbols defined in it: beginning , end of textual version info. add generated object executable, , you'll able access version 2 ways: running strings on binary, or writing code in application print version string (you'll need declare start , end symbols variables in header file).
Read more

android - send complex objects as post php java -

is possible send contact numbers via post php class inside eclipse ? or post limited primitive types , have find work arounds send them string ? i propose: send them json in post request, befor start, have @ gson project , keep in mind set content application -> json. luck
Read more

charts - What graph/dashboard product is facebook using in Dashboard: PUE & WUE -

i love facebook dashboard: pue & wue. beautifull can point out if there open source or commercial product offer similar style? here link https://www.facebook.com/forestcitydatacenter?sk=app_288655784601722&app_data so read through 29,888 lines of javascript ya.. biggest js file i've ever seen. looks make graph using variety of tools, including tween.js . it'd fascinating chat whoever made it. code wheel graph object starts @ line 27,266 text var graphcomponent = class.extend({ . can find source @ https://www.fbpuewue.com/assets/application-3a3af20f7fa3591229c79442ae3d1c26.js . sorry if dissapoints it's not awesome plugin can use :/ share pain. let me know if have questions :)
Read more