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TUN-9291: Remove dynamic reloading of features for datagram v3

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During a refresh of the supported features via the DNS TXT record,
cloudflared would update the internal feature list, but would not
propagate this information to the edge during a new connection.

This meant that a situation could occur in which cloudflared would
think that the client's connection could support datagram V3, and
would setup that muxer locally, but would not propagate that information
to the edge during a register connection in the `ClientInfo` of the
`ConnectionOptions`. This meant that the edge still thought that the
client was setup to support datagram V2 and since the protocols are
not backwards compatible, the local muxer for datagram V3 would reject
the incoming RPC calls.

To address this, the feature list will be fetched only once during
client bootstrapping and will persist as-is until the client is restarted.
This helps reduce the complexity involved with different connections
having possibly different sets of features when connecting to the edge.
The features will now be tied to the client and never diverge across
connections.

Also, retires the use of `support_datagram_v3` in-favor of
`support_datagram_v3_1` to reduce the risk of reusing the feature key.
The `dv3` TXT feature key is also deprecated.

Closes TUN-9291
This commit is contained in:
Devin Carr
2025-05-07 23:21:08 +00:00
parent 40dc601e9d
commit ce27840573
8 changed files with 84 additions and 181 deletions
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6
connection/control.go
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@@ -10,7 +10,7 @@ import (
"github.com/cloudflare/cloudflared/management"
"github.com/cloudflare/cloudflared/tunnelrpc"
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
"github.com/cloudflare/cloudflared/tunnelrpc/pogs"
)
// registerClient derives a named tunnel rpc client that can then be used to register and unregister connections.
@@ -36,7 +36,7 @@ type controlStream struct {
// ControlStreamHandler registers connections with origintunneld and initiates graceful shutdown.
type ControlStreamHandler interface {
// ServeControlStream handles the control plane of the transport in the current goroutine calling this
ServeControlStream(ctx context.Context, rw io.ReadWriteCloser, connOptions *tunnelpogs.ConnectionOptions, tunnelConfigGetter TunnelConfigJSONGetter) error
ServeControlStream(ctx context.Context, rw io.ReadWriteCloser, connOptions *pogs.ConnectionOptions, tunnelConfigGetter TunnelConfigJSONGetter) error
// IsStopped tells whether the method above has finished
IsStopped() bool
}
@@ -78,7 +78,7 @@ func NewControlStream(
func (c *controlStream) ServeControlStream(
ctx context.Context,
rw io.ReadWriteCloser,
connOptions *tunnelpogs.ConnectionOptions,
connOptions *pogs.ConnectionOptions,
tunnelConfigGetter TunnelConfigJSONGetter,
) error {
registrationClient := c.registerClientFunc(ctx, rw, c.registerTimeout)