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Merge pull request #110 from luckman212/luckman212-patch-1

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Add new env var `IPV6_LOCALIZE` to enable auto discovery for IPv6 addresses
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schlagmichdoch 2023-05-23 01:53:23 +02:00 • committed by GitHub
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14
docs/host-your-own.md
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@ -35,6 +35,14 @@ Set options by using the following flags in the `docker run` command:
```
> Limits clients to 1000 requests per 5 min
##### IPv6 Localization
```bash
-e IPV6_LOCALIZE=4
```
> To enable Peer Discovery among IPv6 peers, you can specify a reduced number of segments of the client IPv6 address to be evaluated as the peer's IP. This can be especially useful when using Cloudflare as a proxy.
>
> The flag must be set to an **integer** between `1` and `7`. The number represents the number of IPv6 [hextets](https://en.wikipedia.org/wiki/IPv6#Address_representation) to match the client IP against. The most common value would be `4`, which will group peers within the same `/64` subnet.
##### Websocket Fallback (for VPN)
```bash
-e WS_FALLBACK=true
@ -200,6 +208,12 @@ $env:PORT=3010; npm start
```
> Specify the port PairDrop is running on. (Default: 3000)
#### IPv6 Localization
```bash
IPV6_LOCALIZE=4
```
> Truncate a portion of the client IPv6 address to make peers more discoverable. See [Options/Flags](#options--flags) above.
#### Specify STUN/TURN Server
On Unix based systems
```bash

18
index.js
View file

@ -96,6 +96,16 @@ if (debugMode) {
console.log("DEBUG_MODE is active. To protect privacy, do not use in production.")
}
if (process.env.IPV6_LOCALIZE) {
let ipv6_lcl = parseInt(process.env.IPV6_LOCALIZE);
if (!ipv6_lcl || !(0 < ipv6_lcl && ipv6_lcl < 8)) {
console.error("IPV6_LOCALIZE must be an integer between 1 and 7");
return;
} else {
console.log("IPv6 client IPs will be localized to", ipv6_lcl, ipv6_lcl > 1 ? "segments" : "segment");
}
}
app.use(function(req, res) {
res.redirect('/');
});
@ -516,11 +526,19 @@ class Peer {
if (this.ip.substring(0,7) === "::ffff:")
this.ip = this.ip.substring(7);
let ipv6_was_localized = false;
if (ipv6_lcl && this.ip.includes(':')) {
this.ip = this.ip.split(':',ipv6_lcl).join(':');
ipv6_was_localized = true;
}
if (debugMode) {
console.debug("----DEBUGGING-PEER-IP-START----");
console.debug("remoteAddress:", request.connection.remoteAddress);
console.debug("x-forwarded-for:", request.headers['x-forwarded-for']);
console.debug("cf-connecting-ip:", request.headers['cf-connecting-ip']);
if (ipv6_was_localized)
console.debug("IPv6 client IP was localized to", ipv6_lcl, ipv6_lcl > 1 ? "segments" : "segment");
console.debug("PairDrop uses:", this.ip);
console.debug("IP is private:", this.ipIsPrivate(this.ip));
console.debug("if IP is private, '127.0.0.1' is used instead");