Unable to prevent connection to chat.signal.org after merging Signal iOS 7.63.0.83

[cagatayozcan]

Hi,

After merging version 7.63.0.830 into my forked Signal iOS project, I noticed that the app started connecting to chat.signal.org through libsignal (Rust), even though I had previously configured everything to use my own server infrastructure.

Before this version, all communication was successfully redirected to my custom servers, but now I’m seeing logs like: [rust/bridge/shared/types/src/net.rs:68]: Creating endpoint connections (fallbacks disabled) for chat.signal.org and others

I’ve searched the entire Swift codebase and configuration but couldn’t find any reference to chat.signal.org, which seems to be introduced internally in the Rust code.

Is there a way to prevent the client from connecting to chat.signal.org, or configure it to avoid this behavior?

Thanks!

[akonradi-signal]

Is there a way to prevent the client from connecting to chat.signal.org, or configure it to avoid this behavior?

As noted in libsignal's README, "use outside of Signal is unsupported" and the networking code uses hard-coded values for Signal endpoints.

That being said, the configuration for chat.signal.org is (currently) all in one place. The way to make this work would be to edit these values:

libsignal/rust/net/src/env.rs

Lines 40 to 60 in be9e9a3

	const DOMAIN_CONFIG_CHAT: DomainConfig = DomainConfig {
	ip_v4: &[
	ip_addr!(v4, "76.223.92.165"),
	ip_addr!(v4, "13.248.212.111"),
	],
	ip_v6: &[
	ip_addr!(v6, "2600:9000:a507:ab6d:4ce3:2f58:25d7:9cbf"),
	ip_addr!(v6, "2600:9000:a61f:527c:d5eb:a431:5239:3232"),
	],
	connect: ConnectionConfig {
	hostname: "chat.signal.org",
	port: DEFAULT_HTTPS_PORT,
	cert: SIGNAL_ROOT_CERTIFICATES,
	min_tls_version: Some(SslVersion::TLS1_3),
	confirmation_header_name: Some(TIMESTAMP_HEADER_NAME),
	proxy: Some(ConnectionProxyConfig {
	path_prefix: "/service",
	configs: [PROXY_CONFIG_F_PROD, PROXY_CONFIG_G],
	}),
	},
	};

and then recompile the Rust and Swift portions of libsignal by following the instructions in swift/README.md.