src/connection.h

   1 /*
   2     connection.h -- header for connection.c
   3     Copyright (C) 2000-2002 Guus Sliepen <guus@sliepen.eu.org>,
   4                   2000-2002 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 1.1.2.32 2003/07/06 23:16:28 guus Exp $
  21 */
  22
  23 #ifndef __TINC_CONNECTION_H__
  24 #define __TINC_CONNECTION_H__
  25
  26 #include <sys/time.h>
  27
  28 #include <avl_tree.h>
  29 #include <list.h>
  30
  31 #ifdef HAVE_OPENSSL_EVP_H
  32 # include <openssl/evp.h>
  33 #else
  34 # include <evp.h>
  35 #endif
  36
  37 #ifdef HAVE_OPENSSL_RSA_H
  38 # include <openssl/rsa.h>
  39 #else
  40 # include <rsa.h>
  41 #endif
  42
  43 #include "net.h"
  44 #include "conf.h"
  45
  46 #include "node.h"
  47 #include "edge.h"
  48
  49 #define OPTION_INDIRECT         0x0001
  50 #define OPTION_TCPONLY          0x0002
  51
  52 typedef struct connection_status_t {
  53         int pinged:1;                           /* sent ping */
  54         int active:1;                           /* 1 if active.. */
  55         int connecting:1;                       /* 1 if we are waiting for a non-blocking connect() to finish */
  56         int termreq:1;                          /* the termination of this connection was requested */
  57         int remove:1;                           /* Set to 1 if you want this connection removed */
  58         int timeout:1;                          /* 1 if gotten timeout */
  59         int encryptout:1;                       /* 1 if we can encrypt outgoing traffic */
  60         int decryptin:1;                        /* 1 if we have to decrypt incoming traffic */
  61         int mst:1;                                      /* 1 if this connection is part of a minimum spanning tree */
  62         int unused:18;
  63 } connection_status_t;
  64
  65 typedef struct connection_t {
  66         char *name;                                     /* name he claims to have */
  67
  68         sockaddr_t address;                     /* his real (internet) ip */
  69         char *hostname;                         /* the hostname of its real ip */
  70         int protocol_version;           /* used protocol */
  71
  72         int socket;                                     /* socket used for this connection */
  73         long int options;                       /* options for this connection */
  74         struct connection_status_t status;      /* status info */
  75         int estimated_weight;           /* estimation for the weight of the edge for this connection */
  76         struct timeval start;           /* time this connection was started, used for above estimation */
  77         struct outgoing_t *outgoing;    /* used to keep track of outgoing connections */
  78
  79         struct node_t *node;            /* node associated with the other end */
  80         struct edge_t *edge;            /* edge associated with this connection */
  81
  82         RSA *rsa_key;                           /* his public/private key */
  83         const EVP_CIPHER *incipher;     /* Cipher he will use to send data to us */
  84         const EVP_CIPHER *outcipher;    /* Cipher we will use to send data to him */
  85         EVP_CIPHER_CTX *inctx;          /* Context of encrypted meta data that will come from him to us */
  86         EVP_CIPHER_CTX *outctx;         /* Context of encrypted meta data that will be sent from us to him */
  87         char *inkey;                            /* His symmetric meta key + iv */
  88         char *outkey;                           /* Our symmetric meta key + iv */
  89         int inkeylength;                        /* Length of his key + iv */
  90         int outkeylength;                       /* Length of our key + iv */
  91         const EVP_MD *indigest;
  92         const EVP_MD *outdigest;
  93         int inmaclength;
  94         int outmaclength;
  95         int incompression;
  96         int outcompression;
  97         char *mychallenge;                      /* challenge we received from him */
  98         char *hischallenge;                     /* challenge we sent to him */
  99
 100         char buffer[MAXBUFSIZE];        /* metadata input buffer */
 101         int buflen;                                     /* bytes read into buffer */
 102         int reqlen;                                     /* length of incoming request */
 103         int tcplen;                                     /* length of incoming TCPpacket */
 104         int allow_request;                      /* defined if there's only one request possible */
 105
 106         time_t last_ping_time;          /* last time we saw some activity from the other end */
 107
 108         avl_tree_t *config_tree;        /* Pointer to configuration tree belonging to him */
 109 } connection_t;
 110
 111 extern avl_tree_t *connection_tree;
 112 extern connection_t *broadcast;
 113
 114 extern void init_connections(void);
 115 extern void exit_connections(void);
 116 extern connection_t *new_connection(void) __attribute__ ((malloc));
 117 extern void free_connection(connection_t *);
 118 extern void connection_add(connection_t *);
 119 extern void connection_del(connection_t *);
 120 extern void dump_connections(void);
 121 extern int read_connection_config(connection_t *);
 122
 123 #endif                                                  /* __TINC_CONNECTION_H__ */