--- /dev/null
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/*****************************************************************************
+ * *
+ * These structures should be considered PRIVATE to the record layer. No *
+ * non-record layer code should be using these structures in any way. *
+ * *
+ *****************************************************************************/
+
+typedef struct ssl3_buffer_st {
+ /* at least SSL3_RT_MAX_PACKET_SIZE bytes, see ssl3_setup_buffers() */
+ unsigned char *buf;
+ /* default buffer size (or 0 if no default set) */
+ size_t default_len;
+ /* buffer size */
+ size_t len;
+ /* where to 'copy from' */
+ int offset;
+ /* how many bytes left */
+ int left;
+} SSL3_BUFFER;
+
+#define SEQ_NUM_SIZE 8
+
+typedef struct ssl3_record_st {
+ /* Record layer version */
+ /* r */
+ int rec_version;
+ /* type of record */
+ /* r */
+ int type;
+ /* How many bytes available */
+ /* rw */
+ unsigned int length;
+ /*
+ * How many bytes were available before padding was removed? This is used
+ * to implement the MAC check in constant time for CBC records.
+ */
+ /* rw */
+ unsigned int orig_len;
+ /* read/write offset into 'buf' */
+ /* r */
+ unsigned int off;
+ /* pointer to the record data */
+ /* rw */
+ unsigned char *data;
+ /* where the decode bytes are */
+ /* rw */
+ unsigned char *input;
+ /* only used with decompression - malloc()ed */
+ /* r */
+ unsigned char *comp;
+ /* Whether the data from this record has already been read or not */
+ /* r */
+ unsigned int read;
+ /* epoch number, needed by DTLS1 */
+ /* r */
+ unsigned long epoch;
+ /* sequence number, needed by DTLS1 */
+ /* r */
+ unsigned char seq_num[SEQ_NUM_SIZE];
+} SSL3_RECORD;
+
+typedef struct dtls1_bitmap_st {
+ /* Track 32 packets on 32-bit systems and 64 - on 64-bit systems */
+ unsigned long map;
+ /* Max record number seen so far, 64-bit value in big-endian encoding */
+ unsigned char max_seq_num[SEQ_NUM_SIZE];
+} DTLS1_BITMAP;
+
+typedef struct record_pqueue_st {
+ unsigned short epoch;
+ struct pqueue_st *q;
+} record_pqueue;
+
+typedef struct dtls1_record_data_st {
+ unsigned char *packet;
+ unsigned int packet_length;
+ SSL3_BUFFER rbuf;
+ SSL3_RECORD rrec;
+#ifndef OPENSSL_NO_SCTP
+ struct bio_dgram_sctp_rcvinfo recordinfo;
+#endif
+} DTLS1_RECORD_DATA;
+
+typedef struct dtls_record_layer_st {
+ /*
+ * The current data and handshake epoch. This is initially
+ * undefined, and starts at zero once the initial handshake is
+ * completed
+ */
+ unsigned short r_epoch;
+ unsigned short w_epoch;
+ /* records being received in the current epoch */
+ DTLS1_BITMAP bitmap;
+ /* renegotiation starts a new set of sequence numbers */
+ DTLS1_BITMAP next_bitmap;
+ /* Received handshake records (processed and unprocessed) */
+ record_pqueue unprocessed_rcds;
+ record_pqueue processed_rcds;
+ /*
+ * Buffered application records. Only for records between CCS and
+ * Finished to prevent either protocol violation or unnecessary message
+ * loss.
+ */
+ record_pqueue buffered_app_data;
+ /*
+ * storage for Alert/Handshake protocol data received but not yet
+ * processed by ssl3_read_bytes:
+ */
+ unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
+ unsigned int alert_fragment_len;
+ unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
+ unsigned int handshake_fragment_len;
+ /* save last and current sequence numbers for retransmissions */
+ unsigned char last_write_sequence[8];
+ unsigned char curr_write_sequence[8];
+} DTLS_RECORD_LAYER;
+
+/*****************************************************************************
+ * *
+ * This structure should be considered "opaque" to anything outside of the *
+ * record layer. No non-record layer code should be accessing the members of *
+ * this structure. *
+ * *
+ *****************************************************************************/
+
+typedef struct record_layer_st {
+ /* The parent SSL structure */
+ SSL *s;
+ /*
+ * Read as many input bytes as possible (for
+ * non-blocking reads)
+ */
+ int read_ahead;
+ /* where we are when reading */
+ int rstate;
+ /* How many pipelines can be used to read data */
+ unsigned int numrpipes;
+ /* How many pipelines can be used to write data */
+ unsigned int numwpipes;
+ /* read IO goes into here */
+ SSL3_BUFFER rbuf;
+ /* write IO goes into here */
+ SSL3_BUFFER wbuf[SSL_MAX_PIPELINES];
+ /* each decoded record goes in here */
+ SSL3_RECORD rrec[SSL_MAX_PIPELINES];
+ /* used internally to point at a raw packet */
+ unsigned char *packet;
+ unsigned int packet_length;
+ /* number of bytes sent so far */
+ unsigned int wnum;
+ /*
+ * storage for Alert/Handshake protocol data received but not yet
+ * processed by ssl3_read_bytes:
+ */
+ unsigned char alert_fragment[2];
+ unsigned int alert_fragment_len;
+ unsigned char handshake_fragment[4];
+ unsigned int handshake_fragment_len;
+ /* The number of consecutive empty records we have received */
+ unsigned int empty_record_count;
+ /* partial write - check the numbers match */
+ /* number bytes written */
+ int wpend_tot;
+ int wpend_type;
+ /* number of bytes submitted */
+ int wpend_ret;
+ const unsigned char *wpend_buf;
+ unsigned char read_sequence[SEQ_NUM_SIZE];
+ unsigned char write_sequence[SEQ_NUM_SIZE];
+ /* Set to true if this is the first record in a connection */
+ unsigned int is_first_record;
+ /* Count of the number of consecutive warning alerts received */
+ unsigned int alert_count;
+ DTLS_RECORD_LAYER *d;
+} RECORD_LAYER;
+
+/*****************************************************************************
+ * *
+ * The following macros/functions represent the libssl internal API to the *
+ * record layer. Any libssl code may call these functions/macros *
+ * *
+ *****************************************************************************/
+
+#define MIN_SSL2_RECORD_LEN 9
+
+#define RECORD_LAYER_set_read_ahead(rl, ra) ((rl)->read_ahead = (ra))
+#define RECORD_LAYER_get_read_ahead(rl) ((rl)->read_ahead)
+#define RECORD_LAYER_get_packet(rl) ((rl)->packet)
+#define RECORD_LAYER_get_packet_length(rl) ((rl)->packet_length)
+#define RECORD_LAYER_add_packet_length(rl, inc) ((rl)->packet_length += (inc))
+#define DTLS_RECORD_LAYER_get_w_epoch(rl) ((rl)->d->w_epoch)
+#define DTLS_RECORD_LAYER_get_processed_rcds(rl) \
+ ((rl)->d->processed_rcds)
+#define DTLS_RECORD_LAYER_get_unprocessed_rcds(rl) \
+ ((rl)->d->unprocessed_rcds)
+
+void RECORD_LAYER_init(RECORD_LAYER *rl, SSL *s);
+void RECORD_LAYER_clear(RECORD_LAYER *rl);
+void RECORD_LAYER_release(RECORD_LAYER *rl);
+int RECORD_LAYER_read_pending(const RECORD_LAYER *rl);
+int RECORD_LAYER_write_pending(const RECORD_LAYER *rl);
+int RECORD_LAYER_set_data(RECORD_LAYER *rl, const unsigned char *buf, int len);
+void RECORD_LAYER_reset_read_sequence(RECORD_LAYER *rl);
+void RECORD_LAYER_reset_write_sequence(RECORD_LAYER *rl);
+int RECORD_LAYER_is_sslv2_record(RECORD_LAYER *rl);
+unsigned int RECORD_LAYER_get_rrec_length(RECORD_LAYER *rl);
+__owur int ssl3_pending(const SSL *s);
+__owur int ssl3_write_bytes(SSL *s, int type, const void *buf, int len);
+__owur int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
+ unsigned int *pipelens, unsigned int numpipes,
+ int create_empty_fragment);
+__owur int ssl3_read_bytes(SSL *s, int type, int *recvd_type,
+ unsigned char *buf, int len, int peek);
+__owur int ssl3_setup_buffers(SSL *s);
+__owur int ssl3_enc(SSL *s, SSL3_RECORD *inrecs, unsigned int n_recs, int send);
+__owur int n_ssl3_mac(SSL *ssl, SSL3_RECORD *rec, unsigned char *md, int send);
+__owur int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
+ unsigned int len);
+__owur int tls1_enc(SSL *s, SSL3_RECORD *recs, unsigned int n_recs, int send);
+__owur int tls1_mac(SSL *ssl, SSL3_RECORD *rec, unsigned char *md, int send);
+int DTLS_RECORD_LAYER_new(RECORD_LAYER *rl);
+void DTLS_RECORD_LAYER_free(RECORD_LAYER *rl);
+void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl);
+void DTLS_RECORD_LAYER_set_saved_w_epoch(RECORD_LAYER *rl, unsigned short e);
+void DTLS_RECORD_LAYER_clear(RECORD_LAYER *rl);
+void DTLS_RECORD_LAYER_resync_write(RECORD_LAYER *rl);
+void DTLS_RECORD_LAYER_set_write_sequence(RECORD_LAYER *rl, unsigned char *seq);
+__owur int dtls1_read_bytes(SSL *s, int type, int *recvd_type,
+ unsigned char *buf, int len, int peek);
+__owur int dtls1_write_bytes(SSL *s, int type, const void *buf, int len);
+__owur int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
+ unsigned int len, int create_empty_fragement);
+void dtls1_reset_seq_numbers(SSL *s, int rw);
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