Add Opaque option which prevent information from being forwarded to certain nodes.
[tinc] / 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 1.1.2.37 2003/11/10 22:31:53 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 opaque:1;                           /* 1 if we do not forward information about other nodes */
45         int strict:1;                           /* 1 if we strictly check edges and subnets received from this connection */
46         int unused:18;
47 } connection_status_t;
48
49 #include "edge.h"
50 #include "list.h"
51 #include "net.h"
52 #include "node.h"
53
54 typedef struct connection_t {
55         char *name;                                     /* name he claims to have */
56
57         union sockaddr_t address;                       /* his real (internet) ip */
58         char *hostname;                         /* the hostname of its real ip */
59         int protocol_version;           /* used protocol */
60
61         int socket;                                     /* socket used for this connection */
62         long int options;                       /* options for this connection */
63         struct connection_status_t status;      /* status info */
64         int estimated_weight;           /* estimation for the weight of the edge for this connection */
65         struct timeval start;           /* time this connection was started, used for above estimation */
66         struct outgoing_t *outgoing;    /* used to keep track of outgoing connections */
67
68         struct node_t *node;            /* node associated with the other end */
69         struct edge_t *edge;            /* edge associated with this connection */
70
71         RSA *rsa_key;                           /* his public/private key */
72         const EVP_CIPHER *incipher;     /* Cipher he will use to send data to us */
73         const EVP_CIPHER *outcipher;    /* Cipher we will use to send data to him */
74         EVP_CIPHER_CTX *inctx;          /* Context of encrypted meta data that will come from him to us */
75         EVP_CIPHER_CTX *outctx;         /* Context of encrypted meta data that will be sent from us to him */
76         char *inkey;                            /* His symmetric meta key + iv */
77         char *outkey;                           /* Our symmetric meta key + iv */
78         int inkeylength;                        /* Length of his key + iv */
79         int outkeylength;                       /* Length of our key + iv */
80         const EVP_MD *indigest;
81         const EVP_MD *outdigest;
82         int inmaclength;
83         int outmaclength;
84         int incompression;
85         int outcompression;
86         char *mychallenge;                      /* challenge we received from him */
87         char *hischallenge;                     /* challenge we sent to him */
88
89         char buffer[MAXBUFSIZE];        /* metadata input buffer */
90         int buflen;                                     /* bytes read into buffer */
91         int reqlen;                                     /* length of incoming request */
92         int tcplen;                                     /* length of incoming TCPpacket */
93         int allow_request;                      /* defined if there's only one request possible */
94
95         time_t last_ping_time;          /* last time we saw some activity from the other end */
96
97         avl_tree_t *config_tree;        /* Pointer to configuration tree belonging to him */
98 } connection_t;
99
100 extern avl_tree_t *connection_tree;
101 extern connection_t *broadcast;
102
103 extern void init_connections(void);
104 extern void exit_connections(void);
105 extern connection_t *new_connection(void) __attribute__ ((__malloc__));
106 extern void free_connection(connection_t *);
107 extern void connection_add(connection_t *);
108 extern void connection_del(connection_t *);
109 extern void dump_connections(void);
110 extern bool read_connection_config(connection_t *);
111
112 #endif                                                  /* __TINC_CONNECTION_H__ */