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net/portmapper: fix "running a test" condition.

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Fixes #2686.

Signed-off-by: David Anderson <danderson@tailscale.com>
(cherry picked from commit b49d9bc74d)
This commit is contained in:
David Anderson 2021-08-25 20:13:56 -07:00
parent bd911fdb12
commit 15c87017b8
1 changed files with 13 additions and 1 deletions
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14
net/portmapper/portmapper.go
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@ -236,7 +236,19 @@ func (c *Client) upnpPort() uint16 {
}
func (c *Client) listenPacket(ctx context.Context, network, addr string) (net.PacketConn, error) {
if (c.testPxPPort != 0 || c.testUPnPPort != 0) && os.Getenv("GITHUB_ACTIONS") == "true" {
// When running under testing conditions, we bind the IGD server
// to localhost, and may be running in an environment where our
// netns code would decide that binding the portmapper client
// socket to the default route interface is the correct way to
// ensure connectivity. This can result in us trying to send
// packets for 127.0.0.1 out the machine's LAN interface, which
// obviously gets dropped on the floor.
//
// So, under those testing conditions, do _not_ use netns to
// create listening sockets. Such sockets are vulnerable to
// routing loops, but it's tests that don't set up routing loops,
// so we don't care.
if c.testPxPPort != 0 || c.testUPnPPort != 0 || os.Getenv("GITHUB_ACTIONS") == "true" {
var lc net.ListenConfig
return lc.ListenPacket(ctx, network, addr)
}