More missing IPv6 definitions and autoconf checks to make sure it compiles
[tinc] / 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__ */