irmd: Revise IRMd internals

This is a full revision of the IRMd internal implementation.

The registry is now a proper subcomponent managing its own internal
lock (a single mutex). Some tests are added for the registry and its
data structures. Some macros for tests are added in <ouroboros/test.h>.

Flow allocation is now more symmetric between the client side (alloc)
and server size (accept). Each will create a flow in pending state
(ALLOC_PENDING/ACCEPT_PENDING) that is potentially fulfilled by an
IPCP using respond_alloc and respond_accept primitives. Deallocation
is split in flow_dealloc (application side) and ipcp_flow_dealloc
(IPCP side) to get the flow in DEALLOC_PENDING and DEALLOCATED state.

Cleanup of failed flow allocation is now properly handled instead of
relying on the sanitizer thread. The new sanitizer only needs to
monitor crashed processes.

On shutdown, the IRMd will now detect hanging processes and SIGKILL
them and clean up their fuse mountpoints if needed.

A lot of other things have been cleaned up and shuffled around a bit.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 26 insertions, 21 deletions

diff --git a/src/lib/pb/irm.proto b/src/lib/pb/irm.proto
index 77db8057..c962e5e5 100644
--- a/src/lib/pb/irm.proto
+++ b/src/lib/pb/irm.proto
@@ -37,32 +37,37 @@ enum irm_msg_code {
         IRM_BIND_PROGRAM      =  9;
         IRM_UNBIND_PROGRAM    = 10;
         IRM_PROC_ANNOUNCE     = 11;
-        IRM_BIND_PROCESS      = 12;
-        IRM_UNBIND_PROCESS    = 13;
-        IRM_CREATE_NAME       = 14;
-        IRM_DESTROY_NAME      = 15;
-        IRM_LIST_NAMES        = 16;
-        IRM_REG_NAME          = 17;
-        IRM_UNREG_NAME        = 18;
-        IRM_FLOW_ALLOC        = 19;
-        IRM_FLOW_ACCEPT       = 20;
-        IRM_FLOW_JOIN         = 21;
-        IRM_FLOW_DEALLOC      = 22;
-        IPCP_FLOW_REQ_ARR     = 23;
-        IPCP_FLOW_ALLOC_REPLY = 24;
-        IRM_REPLY             = 25;
+        IRM_PROC_EXIT         = 12;
+        IRM_BIND_PROCESS      = 13;
+        IRM_UNBIND_PROCESS    = 14;
+        IRM_CREATE_NAME       = 15;
+        IRM_DESTROY_NAME      = 16;
+        IRM_LIST_NAMES        = 17;
+        IRM_REG_NAME          = 18;
+        IRM_UNREG_NAME        = 19;
+        IRM_FLOW_ALLOC        = 20;
+        IRM_FLOW_ACCEPT       = 21;
+        IRM_FLOW_JOIN         = 22;
+        IRM_FLOW_DEALLOC      = 23;
+        IPCP_FLOW_DEALLOC     = 24;
+        IPCP_FLOW_REQ_ARR     = 25;
+        IPCP_FLOW_ALLOC_REPLY = 26;
+        IRM_REPLY             = 27;
 }
 
 message ipcp_info_msg {
-        required uint32 type = 1;
-        required string name = 2;
+        required uint32 type  = 1;
+        required string name  = 2;
+        required uint32 pid   = 3;
+        required uint32 state = 4;
 }
 
 message ipcp_list_msg {
-        required uint32 pid   = 1;
-        required uint32 type  = 2;
-        required string name  = 3;
-        required string layer = 4;
+        required uint32 pid       = 1;
+        required uint32 type      = 2;
+        required string name      = 3;
+        required string layer     = 4;
+        required uint32 hash_algo = 5;
 }
 
 message name_info_msg {
@@ -77,7 +82,7 @@ message irm_msg {
         optional string name             =  4;
         optional ipcp_info_msg ipcp_info =  5;
         optional string layer            =  6;
-        repeated string args             =  7;
+        repeated string exec             =  7;
         optional sint32 response         =  8;
         optional string dst              =  9;
         optional bytes  hash             = 10;