tinc/src/connection.h

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/*
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connection.h -- header for connection.c
Copyright (C) 2000-2002 Guus Sliepen <guus@sliepen.eu.org>,
2000-2002 Ivo Timmermans <ivo@o2w.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: connection.h,v 1.1.2.32 2003/07/06 23:16:28 guus Exp $
*/
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#ifndef __TINC_CONNECTION_H__
#define __TINC_CONNECTION_H__
#include <sys/time.h>
#include <avl_tree.h>
#include <list.h>
#ifdef HAVE_OPENSSL_EVP_H
# include <openssl/evp.h>
#else
# include <evp.h>
#endif
#ifdef HAVE_OPENSSL_RSA_H
# include <openssl/rsa.h>
#else
# include <rsa.h>
#endif
#include "net.h"
#include "conf.h"
#include "node.h"
#include "edge.h"
#define OPTION_INDIRECT 0x0001
#define OPTION_TCPONLY 0x0002
typedef struct connection_status_t {
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int pinged:1; /* sent ping */
int active:1; /* 1 if active.. */
int connecting:1; /* 1 if we are waiting for a non-blocking connect() to finish */
int termreq:1; /* the termination of this connection was requested */
int remove:1; /* Set to 1 if you want this connection removed */
int timeout:1; /* 1 if gotten timeout */
int encryptout:1; /* 1 if we can encrypt outgoing traffic */
int decryptin:1; /* 1 if we have to decrypt incoming traffic */
int mst:1; /* 1 if this connection is part of a minimum spanning tree */
int unused:18;
} connection_status_t;
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typedef struct connection_t {
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char *name; /* name he claims to have */
sockaddr_t address; /* his real (internet) ip */
char *hostname; /* the hostname of its real ip */
int protocol_version; /* used protocol */
int socket; /* socket used for this connection */
long int options; /* options for this connection */
struct connection_status_t status; /* status info */
int estimated_weight; /* estimation for the weight of the edge for this connection */
struct timeval start; /* time this connection was started, used for above estimation */
struct outgoing_t *outgoing; /* used to keep track of outgoing connections */
struct node_t *node; /* node associated with the other end */
struct edge_t *edge; /* edge associated with this connection */
RSA *rsa_key; /* his public/private key */
const EVP_CIPHER *incipher; /* Cipher he will use to send data to us */
const EVP_CIPHER *outcipher; /* Cipher we will use to send data to him */
EVP_CIPHER_CTX *inctx; /* Context of encrypted meta data that will come from him to us */
EVP_CIPHER_CTX *outctx; /* Context of encrypted meta data that will be sent from us to him */
char *inkey; /* His symmetric meta key + iv */
char *outkey; /* Our symmetric meta key + iv */
int inkeylength; /* Length of his key + iv */
int outkeylength; /* Length of our key + iv */
const EVP_MD *indigest;
const EVP_MD *outdigest;
int inmaclength;
int outmaclength;
int incompression;
int outcompression;
char *mychallenge; /* challenge we received from him */
char *hischallenge; /* challenge we sent to him */
char buffer[MAXBUFSIZE]; /* metadata input buffer */
int buflen; /* bytes read into buffer */
int reqlen; /* length of incoming request */
int tcplen; /* length of incoming TCPpacket */
int allow_request; /* defined if there's only one request possible */
time_t last_ping_time; /* last time we saw some activity from the other end */
avl_tree_t *config_tree; /* Pointer to configuration tree belonging to him */
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} connection_t;
extern avl_tree_t *connection_tree;
extern connection_t *broadcast;
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extern void init_connections(void);
extern void exit_connections(void);
extern connection_t *new_connection(void) __attribute__ ((malloc));
extern void free_connection(connection_t *);
extern void connection_add(connection_t *);
extern void connection_del(connection_t *);
extern void dump_connections(void);
extern int read_connection_config(connection_t *);
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#endif /* __TINC_CONNECTION_H__ */