sctp.h

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#ifndef JANUS_SCTP_H
#define JANUS_SCTP_H

#ifdef HAVE_SCTP

#define INET 1
#define INET6 1

/* Uncomment the line below to enable SCTP debugging to files */
//~ #define DEBUG_SCTP

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <unistd.h>
#include <stdint.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <usrsctp.h>
#include <glib.h>

#include "mutex.h"
#include "refcount.h"


int janus_sctp_init(void);

void janus_sctp_deinit(void);


#define BUFFER_SIZE (1<<16)
#define NUMBER_OF_CHANNELS (150)
#define NUMBER_OF_STREAMS (300)

#define DATA_CHANNEL_PPID_CONTROL           50
#define DATA_CHANNEL_PPID_DOMSTRING         51
#define DATA_CHANNEL_PPID_BINARY_PARTIAL    52
#define DATA_CHANNEL_PPID_BINARY            53
#define DATA_CHANNEL_PPID_DOMSTRING_PARTIAL 54

#define DATA_CHANNEL_CLOSED     0
#define DATA_CHANNEL_CONNECTING 1
#define DATA_CHANNEL_OPEN       2
#define DATA_CHANNEL_CLOSING    3

#define DATA_CHANNEL_FLAGS_SEND_REQ 0x00000001
#define DATA_CHANNEL_FLAGS_SEND_RSP 0x00000002
#define DATA_CHANNEL_FLAGS_SEND_ACK 0x00000004

struct janus_dtls_srtp;
struct janus_handle;

typedef struct janus_sctp_channel {
        uint32_t id;
        char label[64];
        uint32_t pr_value;
        uint16_t pr_policy;
        uint16_t stream;
        uint8_t unordered;
        uint8_t state;
        uint32_t flags;
} janus_sctp_channel;

typedef struct janus_sctp_association {
        struct janus_dtls_srtp *dtls;
        struct janus_handle *handle;
        uint64_t handle_id;
        struct janus_sctp_channel channels[NUMBER_OF_CHANNELS];
        struct janus_sctp_channel *stream_channel[NUMBER_OF_STREAMS];
        uint16_t stream_buffer[NUMBER_OF_STREAMS];
        uint32_t stream_buffer_counter;
        struct socket *sock;
        uint16_t local_port;
        uint16_t remote_port;
        char *buffer;
        size_t buflen;
        size_t offset;
#ifdef DEBUG_SCTP
        FILE *debug_dump;
#endif

        janus_mutex mutex;
        volatile gint destroyed;
        janus_refcount ref;
} janus_sctp_association;


#define DATA_CHANNEL_OPEN_REQUEST  3    /* FIXME was 0, but should be 3 as per http://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-05 */
#define DATA_CHANNEL_OPEN_RESPONSE 1
#define DATA_CHANNEL_ACK           2

#define DATA_CHANNEL_RELIABLE                                                   0x00
#define DATA_CHANNEL_RELIABLE_UNORDERED                                 0x80
#define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT                    0x01
#define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED  0x81
#define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED                             0x02
#define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED   0x82

/* http://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-05 */
typedef struct janus_datachannel_open_request {
        uint8_t msg_type;
        uint8_t channel_type;
        uint16_t priority;
        uint32_t reliability_params;
        uint16_t label_length;
        uint16_t protocol_length;
        char label[0];
        /* We ignore the Protocol field */
} janus_datachannel_open_request;

typedef struct janus_datachannel_open_response {
        uint8_t msg_type;
        uint8_t error;
        uint16_t flags;
        uint16_t reverse_stream;
} janus_datachannel_open_response;

typedef struct janus_datachannel_ack {
        uint8_t msg_type;
} janus_datachannel_ack;



janus_sctp_association *janus_sctp_association_create(struct janus_dtls_srtp *dtls, struct janus_handle *handle, uint16_t udp_port);

void janus_sctp_association_destroy(janus_sctp_association *sctp);

void janus_sctp_data_from_dtls(janus_sctp_association *sctp, char *buf, int len);

void janus_sctp_send_data(janus_sctp_association *sctp, char *label, char *buf, int len);

#endif

#endif