Comments (4)
EternityForest
commented on July 29, 2024
1
There's a lot of ways to implement it, but the one I had in mind was:
Bob's application discovers his own public IP address and application
port, and puts a record containing that address into the DHT, or into a
tracker.
The DHT key is the hash of the public key, salted with the current date for
a little extra privacy.
His application then uses UPNP to open that port on his local router.
Alice's application, upon detecting an incoming local connection, uses this
hash to look up Bob's public IP, and opens an encrypted connection to
Bob's computer through.
Data is forwarded over this encrypted connection.
Should the router not have UPNP, or the ISP do something to get in the
way, the usual hole punching methods(
https://stackoverflow.com/questions/37367769/how-nat-traversal-works-in-case-of-peer-to-peer-protocols-like-bittorrent)
can be used.
Essentially, the connection is established mostly the same way as normal
BitTorrent traffic.
…On Thu, Sep 7, 2023, 3:25 AM Raghu Saxena ***@***.***> wrote:
Well, where does the TCP connection happen then? I.e. how does a packet
from Alice's computer (localhost:4444) get to Bob's service (i.e. his
localhost:3000)?
ngrok etc. solve the problem of needing to open ports by basically making
a reverse tunnel, and they forward traffic on a Public IP with an open port
that they have.
I'm not sure I quite understand how Bob's service would be exposed for
others to connect to over the internet, assuming he doesn't manually open
any ports.
Even BitTorrent behind an ISP which doesn't let you port-forward would
only allow outgoing connections, so I don't see how torrents would solve it
in a ngrok like manner.
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ckcr4lyf
commented on July 29, 2024
There is clearly a lot of interest in things like ngrok, and a P2P alternative would have many use cases.
Could you explain a bit more as to how what you're describing achieves this?
E.g. let's say Bob (Public IP = 1.2.3.4) is running a webserver on localhost:3000 . He then prepares a "webservice torrent" for this.
If Alice (Public IP = 8.8.8.8) wants to access this, she would acquire the "webservice torrent" (for simplicity let's just assume Bob emails it to her), add it to her client, and select a port e.g. 4444.
Are you saying that now Alice's localhost:4444 would be tunneled to Bob's service running on his localhost:3000?
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EternityForest
commented on July 29, 2024
Yes, Alice would just access localhost:4444(For example's sake let's say
with a browser) and she would see whatever webpage Bob was hosting on his
machine, as long as Bob was running his end of the torrent tunneling
service.
For extra security on sites that were not public, the torrent files or
links could contain a PSK in addition to the certificate, so that you could
not even establish the torrent connection at all without actually having
the torrent file.
Unless Bob chose to publish that file publically, Alice would be the only
one who could access it.
Bob could also create multiple torrents for the same service, and give
Carol a different one, so that he had the option to later revoke individual
users just by deleting their torrent.
…On Thu, Sep 7, 2023, 1:13 AM Raghu Saxena ***@***.***> wrote:
There is clearly a lot of interest in things like ngrok, and a P2P
alternative would have many use cases.
Could you explain a bit more as to how what you're describing achieves
this?
E.g. let's say Bob (Public IP = 1.2.3.4) is running a webserver on
localhost:3000 . He then prepares a "webservice torrent" for this.
If Alice (Public IP = 8.8.8.8) wants to access this, she would acquire
the "webservice torrent" (for simplicity let's just assume Bob emails it to
her), add it to her client, and select a port e.g. 4444.
Are you saying that now Alice's localhost:4444 would be tunneled to Bob's
service running on his localhost:3000?
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ckcr4lyf
commented on July 29, 2024
Well, where does the TCP connection happen then? I.e. how does a packet from Alice's computer (localhost:4444) get to Bob's service (i.e. his localhost:3000)?
ngrok etc. solve the problem of needing to open ports by basically making a reverse tunnel, and they forward traffic on a Public IP with an open port that they have.
I'm not sure I quite understand how Bob's service would be exposed for others to connect to over the internet, assuming he doesn't manually open any ports.
Even BitTorrent behind an ISP which doesn't let you port-forward would only allow outgoing connections, so I don't see how torrents would solve it in a ngrok like manner.
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