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/*
* routent.h
* Onion Router and related definitions.
*
* Matej Pfajfar <mp292@cam.ac.uk>
*/
/*
* Changes :
* $Log$
* Revision 1.1 2002/06/26 22:45:50 arma
* Initial revision
*
* Revision 1.25 2002/04/02 14:27:11 badbytes
* Final finishes.
*
* Revision 1.24 2002/03/29 09:54:19 badbytes
* Fixed type of routentEX.min_interval to struct timeval.
*
* Revision 1.23 2002/03/21 07:20:59 badbytes
* Added a dependency to <sys/time.h>.
*
* Revision 1.22 2002/03/12 23:37:14 mp292
* Additional flag - destory_buf saying whether the buffer should be destroyed
* when the destroy cell is sent.
*
* Revision 1.21 2002/03/03 00:06:45 mp292
* Modifications to support re-transmission.
*
* Revision 1.20 2002/02/09 16:58:53 mp292
* Postponed implementtion of POLICY_DROP_CONNECTIONS due to problems. Need to
* discuss with Andrei first.
*
* Revision 1.19 2002/02/09 16:54:59 mp292
* routentEX now contains a per anonymous connection packet count
*
* Revision 1.18 2002/01/29 00:59:16 mp292
* Slight changes in the way timers are kept, c.f. changes in the network funnel.
*
* Revision 1.17 2002/01/28 21:37:36 mp292
* Router's output buffer is now dynamic. Time of last output to the router
* added to routentEX.
*
* Revision 1.16 2002/01/26 19:26:55 mp292
* Reviewed according to Secure-Programs-HOWTO.
*
* Revision 1.15 2002/01/18 22:55:40 mp292
* Added a cell buffer to struct routent so that a cell can be received in
* several bursts of data. This prevents a DoS attack on the network funnel.
*
* Revision 1.14 2002/01/14 13:05:37 badbytes
* System testing in progress.
*
* Revision 1.13 2002/01/11 15:47:17 badbytes
* *** empty log message ***
*
* Revision 1.12 2002/01/10 08:28:33 badbytes
* routent and routentEX related routines
*
* Revision 1.11 2002/01/08 15:13:30 badbytes
* Added cipher context to routentEX
*
* Revision 1.10 2002/01/08 13:18:48 badbytes
* Added a connection buffer to routentEX
*
* Revision 1.9 2002/01/08 13:02:16 badbytes
* routentEX now contains f_key and b_key, 56-bit DES keys for link encryption
*
* Revision 1.8 2002/01/03 11:17:01 badbytes
* routentEX.max and routentEX.min values changed to 32bit not 64bit.
*
* Revision 1.7 2002/01/03 11:04:16 badbytes
* *** empty log message ***
*
* Revision 1.6 2002/01/03 11:03:14 badbytes
* Added an extended version of routent which includes link utilisation info.
*
* Revision 1.5 2001/12/18 15:26:34 badbytes
* Added #inclusion of <stdint.h>
*
* Revision 1.4 2001/12/18 15:19:41 badbytes
* In struct routent, changed long and short types to uint32_t and uint16_t
*
* Revision 1.3 2001/12/18 10:37:47 badbytes
* Header files now only apply if they were not previously included from somewhere else.
*
* Revision 1.2 2001/12/17 13:35:17 badbytes
* Still writing handle_connection()
*
* Revision 1.1 2001/12/14 13:14:03 badbytes
* Split types.h into routent.h and ss.h. Keeping them all in one file created unnecesary dependencies.
*
*/
#ifndef __ROUTENT_H
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <stdint.h>
#include <sys/time.h>
#include <time.h>
#include <sys/timeb.h>
#include "cell.h"
/* per-anonymous-connection cell buffer */
typedef struct
{
uint16_t aci;
int policy;
unsigned int cells;
unsigned char *buf;
unsigned int buflen;
unsigned int offset; /* offset to the position of the first cell in the buffer */
cell_t dc; /* static buffer for the destroy cell - so we are always able to destroy a connection */
unsigned char dc_set; /* flag that signifies presence of a destroy cell */
unsigned char destroy_buf; /* flag that signifies that the buffer shuld be destroyed when the destroy cell is sent */
/* POLICY_DROP_CELLS only */
unsigned int win_size; /* window size for the connection (number of cells)*/
unsigned int win_avail; /* available window size */
uint32_t seq_out; /* next sequence number to use for outgoing cells */
uint32_t seq_in; /* next expected sequence number */
uint32_t ack; /* next expected ack/nack */
struct timeval last_ack; /* time of last ACK/NACK */
void *prev;
void *next;
} conn_buf_t;
/* onion router as seen by the onion proxy */
typedef struct
{
char *address;
uint32_t addr; /* address in network byte order */
uint16_t port; /* network port in network byte order */
uint16_t entry_port; /* entry port in network byte order */
RSA *pkey;
void *next;
} routent_t;
/* onion router as seen by other routers */
typedef struct
{
char *address;
uint32_t addr;
uint16_t port;
RSA *pkey; /* public RSA key */
/* 64-bit DES keys for link encryption */
char f_key[8];
char b_key[8];
char f_iv[8];
char b_iv[8];
EVP_CIPHER_CTX f_ctx;
EVP_CIPHER_CTX b_ctx;
/* link info */
uint32_t min;
uint32_t max;
struct timeval min_interval;
/* time when last data was sent to that router */
struct timeval lastsend;
/* socket */
int s;
/* connection buffers */
conn_buf_t *conn_bufs; /* linked list of connection buffers */
conn_buf_t *last_conn_buf; /* last item in the list */
unsigned int next_to_service; /* offset to the connection buffer that is next in turn to be serviced */
/* cell buffer */
unsigned char cellbuf[128];
unsigned int celllen;
void *next;
} routentEX_t;
routentEX_t *id_router(routentEX_t **routerarray, size_t rarray_len, uint32_t addr, uint16_t port);
routentEX_t *id_routerbys(routentEX_t **routerarray, size_t rarray_len, int s);
conn_buf_t *new_conn_buf(uint16_t aci, int policy, conn_buf_t **conn_bufs, conn_buf_t **last_conn_buf);
int remove_conn_buf(conn_buf_t *conn_buf, conn_buf_t **conn_bufs, conn_buf_t **last_conn_buf);
conn_buf_t *id_conn_buf(conn_buf_t *conn_bufs, uint16_t aci);
#define __ROUTENT_H
#endif
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