dtls.pyx: Declare exception propagation

DTLSSocket/dtls.pyx

@@ -19,7 +19,7 @@ DTLS_LOG_INFO   = tdtls.DTLS_LOG_INFO
 DTLS_LOG_DEBUG  = tdtls.DTLS_LOG_DEBUG
 
 
-cdef int _write(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len):
+cdef int _write(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len) except -1:
   """Send data to socket"""
   self = <object>(ctx.app)
   data = buf[:len]
@@ -29,7 +29,7 @@ cdef int _write(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len)
   cdef int ret = self.pycb['write']((ip, port), data)
   return ret
   
-cdef int _read(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len):
+cdef int _read(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len) except -1:
   """Send data to application"""
   self = <object>(ctx.app)
   data = buf[:len]
@@ -39,7 +39,7 @@ cdef int _read(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len):
   cdef int ret = self.pycb['read']((ip, port), data)
   return ret
   
-cdef int _event(dtls_context_t *ctx, session_t *session, dtls_alert_level_t level, unsigned short code):
+cdef int _event(dtls_context_t *ctx, session_t *session, dtls_alert_level_t level, unsigned short code) except -1:
   """The event handler is called when a message from the alert protocol is received or the state of the DTLS session changes."""
   self = <object>(ctx.app)
   if self.pycb['event'] != None:
@@ -54,7 +54,7 @@ cdef int _get_psk_info(dtls_context_t *ctx,
 		      const unsigned char *desc_data,
 		      size_t desc_len,
 		      unsigned char *result_data,
-		      size_t result_length):
+		      size_t result_length) except -1:
   """Called during handshake to get information related to the psk key exchange. 
    
    The type of information requested is indicated by @p type 

DTLSSocket/tdtls.pxd

@@ -83,10 +83,14 @@ cdef extern from "tinydtls/dtls.h":
     unsigned char readbuf[1400] #DTLS_MAX_BUF
   
   ctypedef struct dtls_handler_t:
-    int (*write)(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len)
-    int (*read)(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len)
-    int (*event)(dtls_context_t *ctx, session_t *session, dtls_alert_level_t level, unsigned short code)
-    int (*get_psk_info)(dtls_context_t *ctx, const session_t *session, dtls_credentials_type_t type, const unsigned char *desc, size_t desc_len, unsigned char *result, size_t result_length)
+    int (*write)(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len) except -1
+    # Actually, the return value is ignored by tinydtls; -1 is used for errors
+    # for consistency with write and get_psk_info
+    int (*read)(dtls_context_t *ctx, session_t *session, uint8 *buf, size_t len) except -1
+    # Actually, the return value is ignored by tinydtls; -1 is used for errors
+    # for consistency with write and get_psk_info
+    int (*event)(dtls_context_t *ctx, session_t *session, dtls_alert_level_t level, unsigned short code) except -1
+    int (*get_psk_info)(dtls_context_t *ctx, const session_t *session, dtls_credentials_type_t type, const unsigned char *desc, size_t desc_len, unsigned char *result, size_t result_length) except -1
   
   void dtls_init()
   void dtls_set_handler(dtls_context_t *ctx, dtls_handler_t *h) #inline...