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, 14 insertions, 33 deletions

diff --git a/src/irmd/ipcp.h b/src/irmd/ipcp.h
index 28366c62..b7413cd2 100644
--- a/src/irmd/ipcp.h
+++ b/src/irmd/ipcp.h
@@ -24,15 +24,9 @@
 #include <ouroboros/protobuf.h>
 #include <ouroboros/sockets.h>
 
-#include <sys/types.h>
-
 #ifndef OUROBOROS_IRMD_IPCP_H
 #define OUROBOROS_IRMD_IPCP_H
 
-pid_t ipcp_create(const struct ipcp_info * info);
-
-int   ipcp_destroy(pid_t pid);
-
 int   ipcp_enroll(pid_t               pid,
                   const char *        dst,
                   struct layer_info * info);
@@ -50,38 +44,25 @@ int   ipcp_disconnect(pid_t        pid,
                       const char * dst,
                       const char * component);
 
-int   ipcp_reg(pid_t           pid,
-               const uint8_t * hash,
-               size_t          len);
+int   ipcp_reg(pid_t          pid,
+               const buffer_t hash);
 
-int   ipcp_unreg(pid_t           pid,
-                 const uint8_t * hash,
-                 size_t          len);
+int   ipcp_unreg(pid_t          pid,
+                 const buffer_t hash);
 
-int   ipcp_query(pid_t           pid,
-                 const uint8_t * hash,
-                 size_t          len);
+int   ipcp_query(pid_t          pid,
+                 const buffer_t dst);
 
-int   ipcp_flow_alloc(pid_t           pid,
-                      int             flow_id,
-                      pid_t           n_pid,
-                      const uint8_t * dst,
-                      size_t          len,
-                      qosspec_t       qs,
-                      const buffer_t  data);
+int   ipcp_flow_alloc(const struct flow_info * flow,
+                      const buffer_t           hash,
+                      const buffer_t           data);
 
-int   ipcp_flow_join(pid_t           pid,
-                     int             flow_id,
-                     pid_t           n_pid,
-                     const uint8_t * dst,
-                     size_t          len,
-                     qosspec_t       qs);
+int   ipcp_flow_join(const struct flow_info * flow,
+                     const buffer_t           dst);
 
-int   ipcp_flow_alloc_resp(pid_t          pid,
-                           int            flow_id,
-                           pid_t          n_pid,
-                           int            response,
-                           const buffer_t data);
+int   ipcp_flow_alloc_resp(const struct flow_info * flow,
+                           int                      response,
+                           const buffer_t           data);
 
 int   ipcp_flow_dealloc(pid_t  pid,
                         int    flow_id,