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cultmesh-kotlin: the bind self-test observes a wildcard, not its family

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A JVM wildcard socket is dual-stack, so a client bound to 0.0.0.0 reports the
IPv6 wildcard as its local address and the self-test's first check failed on
Linux. Assert that a client for a remote endpoint binds a wildcard, and keep the
exact loopback checks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Meta Vens 2026-09-30 13:52:26 +02:00
commit e079ba1ad3
1 changed files with 6 additions and 4 deletions
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10
packages/cultmesh-kotlin/src/main/kotlin/org/gamecult/cultmesh/CultMesh.kt
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@ -5400,14 +5400,16 @@ private fun rudpClientBoundHost(endpoint: String, bindHost: String? = null): Ine
}
// A client bound to loopback cannot send to another host on Windows, so a
// client for a remote endpoint binds the unspecified address of its family.
// client for a remote endpoint binds the unspecified address. A JVM wildcard
// socket is dual-stack and reports one wildcard for either family, so the
// family is not observable here.
private fun rudpClientBindsLoopbackOnlyForALoopbackEndpoint() {
check(rudpClientBoundHost("rudp://10.77.0.1:17872") == InetAddress.getByName("0.0.0.0"))
check(rudpClientBoundHost("rudp://[2001:db8::1]:17872") == InetAddress.getByName("::"))
check(rudpClientBoundHost("rudp://10.77.0.1:17872").isAnyLocalAddress)
check(rudpClientBoundHost("rudp://[2001:db8::1]:17872").isAnyLocalAddress)
check(rudpClientBoundHost("rudp://127.0.0.1:17872") == InetAddress.getByName("127.0.0.1"))
check(rudpClientBoundHost("rudp://[::1]:17872") == InetAddress.getByName("::1"))
check(rudpClientBoundHost("rudp://10.77.0.1:17872", "127.0.0.1") == InetAddress.getByName("127.0.0.1"))
check(rudpClientBoundHost("rudp://127.0.0.1:17872", "0.0.0.0") == InetAddress.getByName("0.0.0.0"))
check(rudpClientBoundHost("rudp://127.0.0.1:17872", "0.0.0.0").isAnyLocalAddress)
CultMesh.createRudpServer("kotlin-rudp-bind-server", 0x10203061L).use { server ->
check(InetAddress.getByName(server.profile.transports.single().host) == InetAddress.getByName("127.0.0.1"))
}