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Handle simultaneous initiate protocol case.

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1) Modify SessionRecord to store a list of "previous" sessions
   in addition to the current active session.  Previous sessions
   can be used for receiving messages, but not for sending
   messages.

2) When a possible "simultaneous initiate" is detected, push the
   current session onto the "previous session" stack instead of
   clearing it and starting over.

3) Additionally, mark the new session created on a received
   possible "simultaneous initiate" as stale for sending.  The
   next outgoing message would trigger a full prekey refresh.

4) Work to do: outgoing messages on the SMS transport should
   probably not use the existing session if it's marked stale
   for sending.  These messages need to fail and notify the user,
   similar to how we'll handle SMS fallback to push users before
   a prekey session is created.
This commit is contained in:
Moxie Marlinspike
2014-03-17 17:24:00 -07:00
parent edc20883eb
commit 926d3c929f
12 changed files with 1435 additions and 514 deletions
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7
library/protobuf/LocalStorageProtocol.proto
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@@ -54,6 +54,13 @@ message SessionStructure {
optional uint32 remoteRegistrationId = 10;
optional uint32 localRegistrationId = 11;
optional bool needsRefresh = 12;
}
message RecordStructure {
optional SessionStructure currentSession = 1;
repeated SessionStructure previousSessions = 2;
}
message PreKeyRecordStructure {