+/*
+ * The valid handshake states (one for each type message sent and one for each
+ * type of message received). There are also two "special" states:
+ * TLS = TLS or DTLS state
+ * DTLS = DTLS specific state
+ * CR/SR = Client Read/Server Read
+ * CW/SW = Client Write/Server Write
+ *
+ * The "special" states are:
+ * TLS_ST_BEFORE = No handshake has been initiated yet
+ * TLS_ST_OK = A handshake has been successfully completed
+ */
+enum HANDSHAKE_STATE {
+ TLS_ST_BEFORE,
+ TLS_ST_OK,
+ DTLS_ST_CR_HELLO_VERIFY_REQUEST,
+ TLS_ST_CR_SRVR_HELLO,
+ TLS_ST_CR_CERT,
+ TLS_ST_CR_CERT_STATUS,
+ TLS_ST_CR_KEY_EXCH,
+ TLS_ST_CR_CERT_REQ,
+ TLS_ST_CR_SRVR_DONE,
+ TLS_ST_CR_SESSION_TICKET,
+ TLS_ST_CR_CHANGE,
+ TLS_ST_CR_FINISHED,
+ TLS_ST_CW_CLNT_HELLO,
+ TLS_ST_CW_CERT,
+ TLS_ST_CW_KEY_EXCH,
+ TLS_ST_CW_CERT_VRFY,
+ TLS_ST_CW_CHANGE,
+ TLS_ST_CW_NEXT_PROTO,
+ TLS_ST_CW_FINISHED,
+ TLS_ST_SW_HELLO_REQ,
+ TLS_ST_SR_CLNT_HELLO,
+ DTLS_ST_SW_HELLO_VERIFY_REQUEST,
+ TLS_ST_SW_SRVR_HELLO,
+ TLS_ST_SW_CERT,
+ TLS_ST_SW_KEY_EXCH,
+ TLS_ST_SW_CERT_REQ,
+ TLS_ST_SW_SRVR_DONE,
+ TLS_ST_SR_CERT,
+ TLS_ST_SR_KEY_EXCH,
+ TLS_ST_SR_CERT_VRFY,
+ TLS_ST_SR_NEXT_PROTO,
+ TLS_ST_SR_CHANGE,
+ TLS_ST_SR_FINISHED,
+ TLS_ST_SW_SESSION_TICKET,
+ TLS_ST_SW_CERT_STATUS,
+ TLS_ST_SW_CHANGE,
+ TLS_ST_SW_FINISHED
+};
+
+/*
+ * 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 read_state_first_init;
+ int use_timer;
+#ifndef OPENSSL_NO_SCTP
+ int in_sctp_read_sock;
+#endif
+};
+typedef struct statem_st STATEM;
+
+
projects / openssl.git / blobdiff