+/*
+ * Valid return codes used for functions performing work prior to or after
+ * sending or receiving a message
+ */
+enum WORK_STATE {
+ /* Something went wrong */
+ WORK_ERROR,
+ /* We're done working and there shouldn't be anything else to do after */
+ WORK_FINISHED_STOP,
+ /* We're done working move onto the next thing */
+ WORK_FINISHED_CONTINUE,
+ /* We're working on phase A */
+ WORK_MORE_A,
+ /* We're working on phase B */
+ WORK_MORE_B
+};
+
+/* Write transition return codes */
+enum WRITE_TRAN {
+ /* Something went wrong */
+ WRITE_TRAN_ERROR,
+ /* A transition was successfully completed and we should continue */
+ WRITE_TRAN_CONTINUE,
+ /* There is no more write work to be done */
+ WRITE_TRAN_FINISHED
+};
+
+/* Message processing return codes */
+enum MSG_PROCESS_RETURN {
+ MSG_PROCESS_ERROR,
+ MSG_PROCESS_FINISHED_READING,
+ MSG_PROCESS_CONTINUE_PROCESSING,
+ MSG_PROCESS_CONTINUE_READING
+};
+
+/* Message flow states */
+enum MSG_FLOW_STATE {
+ /* No handshake in progress */
+ MSG_FLOW_UNINITED,
+ /* A permanent error with this connection */
+ MSG_FLOW_ERROR,
+ /* We are about to renegotiate */
+ MSG_FLOW_RENEGOTIATE,
+ /* We are reading messages */
+ MSG_FLOW_READING,
+ /* We are writing messages */
+ MSG_FLOW_WRITING,
+ /* Handshake has finished */
+ MSG_FLOW_FINISHED
+};
+
+/* Read states */
+enum READ_STATE {
+ READ_STATE_HEADER,
+ READ_STATE_BODY,
+ READ_STATE_POST_PROCESS
+};
+
+/* Write states */
+enum WRITE_STATE {
+ WRITE_STATE_TRANSITION,
+ WRITE_STATE_PRE_WORK,
+ WRITE_STATE_SEND,
+ WRITE_STATE_POST_WORK
+};
+
+struct statem_st {
+ enum MSG_FLOW_STATE state;
+ enum WRITE_STATE write_state;
+ enum WORK_STATE write_state_work;
+ enum READ_STATE read_state;
+ enum WORK_STATE read_state_work;
+ enum HANDSHAKE_STATE hand_state;
+ int in_init;
+ int read_state_first_init;
+ int use_timer;
+#ifndef OPENSSL_NO_SCTP
+ int in_sctp_read_sock;
+#endif
+};
+typedef struct statem_st STATEM;
+
+