Am 14.12.2013 12:42, schrieb Alexander Holler:
Hello,
I've experienced a small problem which makes me wonder how userspace is
expected to handle that.
To explain the problem, I use simple-agent and rfcomm on the local side
(Linux with bluez) and a remote device with a fixed pin (without user
interaction, it refuses or allows connections based on the pin), but I
think the underlying problem is independent of that configuration.
Furthermore, I did a small patch to the local simple-agent:
-----------------
diff --git a/test/simple-agent b/test/simple-agent
index 854e1af..63b705b 100755
--- a/test/simple-agent
+++ b/test/simple-agent
@@ -64,8 +64,9 @@ class Agent(dbus.service.Object):
in_signature="o",
out_signature="s")
def RequestPinCode(self, device):
print("RequestPinCode (%s)" % (device))
- set_trusted(device)
- return ask("Enter PIN Code: ")
+ #set_trusted(device)
+ #return ask("Enter PIN Code: ")
+ return "666"
@dbus.service.method(AGENT_INTERFACE,
in_signature="o",
out_signature="u")
-----------------
That means it now always returns 666 as pin without asking the user.
This pin doesn't match the pin of the remote device.
If I now call
for i in $(seq 1 100); do rfcomm connect rfcomm666 aa:bb:cc:dd:ee:ff ; done
in a shell, only one Pin request (the first) ends up at simple-agent but
all connection attempts are refused.
So besides the first connection attempt, all others do die somewhere
where userspace has no control over.
What happens is likely that connection attempts are refused by the
remote side, because an ongoing connection or authorization attempt
isn't finished while a new one arrives.
The problem I see here is, that userspace has no control about what
happens during a connection attempt. And userspace doesn't know if any
other process just did a connection attempt too. How should userspace
behave to make sure every connection attempt ends up in a pin-request
for the user?
Shouldn't those connection/pairing/authorization attempts to the same
remote device be serialized by bluez?
Sorry, I forget to mention the local system: Linux 3.12.5 and bluez 5.12.
Regards,
Alexander Holler
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