#ifndef _BPP_H_1b1adb2c_
#define _BPP_H_1b1adb2c_

typedef struct bpp BPP;
typedef struct layer LAYER;
typedef struct layerdesc LAYERDESC;

#include "str.h"
#include "algs.h"

/* This is more generous than the spec says we need to be; it says 255
   including the trailing CRLF.  Our max doesn't include the CRLF. */
#define SSH_MAX_VERSION_LEN 256

/* Max size of a packet on the wire (after compression and encryption and
   adding the leading/trailing goop).  The spec says this must be >=35000. */
#define SSH_MAX_PACKET_LEN 40000

/* Max size of a packet payload, in the uncompressed clear.
   The spec says this must be >=32768. */
#define SSH_MAX_PAYLOAD_LEN 35000

/* bpp = binary packet protocol */

struct bpp {
  ENCALG *w_enc;
  void *w_encstate;
  ENCALG *r_enc;
  void *r_encstate;
  COMPALG *w_comp;
  void *w_compstate;
  COMPALG *r_comp;
  void *r_compstate;
  MACALG *w_mac;
  void *w_macstate;
  MACALG *r_mac;
  void *r_macstate;
  KEXALG *kex;
  HKALG *hk;
  STR K_S;
  unsigned int w_seq;
  unsigned int r_seq;
  void *kex_k;
  int kex_klen;
  void *kex_h;
  int kex_hlen;
  HASHALG *kex_hash;
  void *hashbuf;
  void *sessid;
  int sessidlen;
  LAYER *toplayer;
  char c_version[SSH_MAX_VERSION_LEN];
  int c_vlen;
  char s_version[SSH_MAX_VERSION_LEN];
  int s_vlen;
  void *c_kexinit_payload;
  int c_kexinit_paylen;
  void *s_kexinit_payload;
  int s_kexinit_paylen;
  int ipkts_to_rekey;
  int opkts_to_rekey;
  int ibytes_to_rekey;
  int obytes_to_rekey;
  int want_rekey;
  unsigned char rawipkt[SSH_MAX_PACKET_LEN];
  unsigned char ipkt[SSH_MAX_PAYLOAD_LEN];
  int iplen;
  unsigned char rawopkt[SSH_MAX_PAYLOAD_LEN];
  unsigned char opkt[SSH_MAX_PACKET_LEN];
  int oplen;
  } ;

struct layer {
  BPP *b;
  void (*rpkt)(LAYER *, void *);
  void (*wpkt)(LAYER *, void *);
  void *arg;
  LAYER *lower;
  } ;

struct layerdesc {
  void *(*init)(LAYER *);
  void (*rfn)(LAYER *, void *);
  void (*wfn)(LAYER *, void *);
  } ;

extern void lower_read(LAYER *);
extern void lower_write(LAYER *);
extern void send_disconnect(int, const void *, int, const void *, int);

#endif