src/connection.h

   1 /*
   2     connection.h -- header for connection.c
   3     Copyright (C) 2000-2003 Guus Sliepen <guus@sliepen.eu.org>,
   4                   2000-2003 Ivo Timmermans <ivo@o2w.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id: connection.h,v 1.1.2.35 2003/07/22 20:55:19 guus Exp $
  21 */
  22
  23 #ifndef __TINC_CONNECTION_H__
  24 #define __TINC_CONNECTION_H__
  25
  26 #include <openssl/rsa.h>
  27 #include <openssl/evp.h>
  28
  29 #include "avl_tree.h"
  30
  31 #define OPTION_INDIRECT         0x0001
  32 #define OPTION_TCPONLY          0x0002
  33
  34 typedef struct connection_status_t {
  35         int pinged:1;                           /* sent ping */
  36         int active:1;                           /* 1 if active.. */
  37         int connecting:1;                       /* 1 if we are waiting for a non-blocking connect() to finish */
  38         int termreq:1;                          /* the termination of this connection was requested */
  39         int remove:1;                           /* Set to 1 if you want this connection removed */
  40         int timeout:1;                          /* 1 if gotten timeout */
  41         int encryptout:1;                       /* 1 if we can encrypt outgoing traffic */
  42         int decryptin:1;                        /* 1 if we have to decrypt incoming traffic */
  43         int mst:1;                                      /* 1 if this connection is part of a minimum spanning tree */
  44         int unused:18;
  45 } connection_status_t;
  46
  47 #include "edge.h"
  48 #include "list.h"
  49 #include "net.h"
  50 #include "node.h"
  51
  52 typedef struct connection_t {
  53         char *name;                                     /* name he claims to have */
  54
  55         union sockaddr_t address;                       /* his real (internet) ip */
  56         char *hostname;                         /* the hostname of its real ip */
  57         int protocol_version;           /* used protocol */
  58
  59         int socket;                                     /* socket used for this connection */
  60         long int options;                       /* options for this connection */
  61         struct connection_status_t status;      /* status info */
  62         int estimated_weight;           /* estimation for the weight of the edge for this connection */
  63         struct timeval start;           /* time this connection was started, used for above estimation */
  64         struct outgoing_t *outgoing;    /* used to keep track of outgoing connections */
  65
  66         struct node_t *node;            /* node associated with the other end */
  67         struct edge_t *edge;            /* edge associated with this connection */
  68
  69         RSA *rsa_key;                           /* his public/private key */
  70         const EVP_CIPHER *incipher;     /* Cipher he will use to send data to us */
  71         const EVP_CIPHER *outcipher;    /* Cipher we will use to send data to him */
  72         EVP_CIPHER_CTX *inctx;          /* Context of encrypted meta data that will come from him to us */
  73         EVP_CIPHER_CTX *outctx;         /* Context of encrypted meta data that will be sent from us to him */
  74         char *inkey;                            /* His symmetric meta key + iv */
  75         char *outkey;                           /* Our symmetric meta key + iv */
  76         int inkeylength;                        /* Length of his key + iv */
  77         int outkeylength;                       /* Length of our key + iv */
  78         const EVP_MD *indigest;
  79         const EVP_MD *outdigest;
  80         int inmaclength;
  81         int outmaclength;
  82         int incompression;
  83         int outcompression;
  84         char *mychallenge;                      /* challenge we received from him */
  85         char *hischallenge;                     /* challenge we sent to him */
  86
  87         char buffer[MAXBUFSIZE];        /* metadata input buffer */
  88         int buflen;                                     /* bytes read into buffer */
  89         int reqlen;                                     /* length of incoming request */
  90         int tcplen;                                     /* length of incoming TCPpacket */
  91         int allow_request;                      /* defined if there's only one request possible */
  92
  93         time_t last_ping_time;          /* last time we saw some activity from the other end */
  94
  95         avl_tree_t *config_tree;        /* Pointer to configuration tree belonging to him */
  96 } connection_t;
  97
  98 extern avl_tree_t *connection_tree;
  99 extern connection_t *broadcast;
 100
 101 extern void init_connections(void);
 102 extern void exit_connections(void);
 103 extern connection_t *new_connection(void) __attribute__ ((malloc));
 104 extern void free_connection(connection_t *);
 105 extern void connection_add(connection_t *);
 106 extern void connection_del(connection_t *);
 107 extern void dump_connections(void);
 108 extern bool read_connection_config(connection_t *);
 109
 110 #endif                                                  /* __TINC_CONNECTION_H__ */