087d8f0023086c58f047c687415b51762e92d62c
[tinc] / src / connection.h
1 /*
2     connection.h -- header for connection.c
3     Copyright (C) 2000-2006 Guus Sliepen <guus@tinc-vpn.org>,
4                   2000-2005 Ivo Timmermans
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     $Id$
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 #define OPTION_PMTU_DISCOVERY   0x0004
34
35 typedef union connection_status_t {
36         struct {
37                 int pinged:1;                           /* sent ping */
38                 int active:1;                           /* 1 if active.. */
39                 int connecting:1;                       /* 1 if we are waiting for a non-blocking connect() to finish */
40                 int termreq:1;                          /* the termination of this connection was requested */
41                 int remove:1;                           /* Set to 1 if you want this connection removed */
42                 int timeout:1;                          /* 1 if gotten timeout */
43                 int encryptout:1;                       /* 1 if we can encrypt outgoing traffic */
44                 int decryptin:1;                        /* 1 if we have to decrypt incoming traffic */
45                 int mst:1;                              /* 1 if this connection is part of a minimum spanning tree */
46                 int unused:23;
47         };
48         uint32_t value;
49 } connection_status_t;
50
51 #include "edge.h"
52 #include "list.h"
53 #include "net.h"
54 #include "node.h"
55
56 typedef struct connection_t {
57         char *name;                                     /* name he claims to have */
58
59         union sockaddr_t address;                       /* his real (internet) ip */
60         char *hostname;                         /* the hostname of its real ip */
61         int protocol_version;           /* used protocol */
62
63         int socket;                                     /* socket used for this connection */
64         long int options;                       /* options for this connection */
65         connection_status_t status;     /* status info */
66         int estimated_weight;           /* estimation for the weight of the edge for this connection */
67         struct timeval start;           /* time this connection was started, used for above estimation */
68         struct outgoing_t *outgoing;    /* used to keep track of outgoing connections */
69
70         struct node_t *node;            /* node associated with the other end */
71         struct edge_t *edge;            /* edge associated with this connection */
72
73         RSA *rsa_key;                           /* his public/private key */
74         const EVP_CIPHER *incipher;     /* Cipher he will use to send data to us */
75         const EVP_CIPHER *outcipher;    /* Cipher we will use to send data to him */
76         EVP_CIPHER_CTX *inctx;          /* Context of encrypted meta data that will come from him to us */
77         EVP_CIPHER_CTX *outctx;         /* Context of encrypted meta data that will be sent from us to him */
78         char *inkey;                            /* His symmetric meta key + iv */
79         char *outkey;                           /* Our symmetric meta key + iv */
80         int inkeylength;                        /* Length of his key + iv */
81         int outkeylength;                       /* Length of our key + iv */
82         const EVP_MD *indigest;
83         const EVP_MD *outdigest;
84         int inmaclength;
85         int outmaclength;
86         int incompression;
87         int outcompression;
88         char *mychallenge;                      /* challenge we received from him */
89         char *hischallenge;                     /* challenge we sent to him */
90
91         char buffer[MAXBUFSIZE];        /* metadata input buffer */
92         int buflen;                                     /* bytes read into buffer */
93         int reqlen;                                     /* length of incoming request */
94         int tcplen;                                     /* length of incoming TCPpacket */
95         int allow_request;                      /* defined if there's only one request possible */
96
97         char *outbuf;                           /* metadata output buffer */
98         int outbufstart;                        /* index of first meaningful byte in output buffer */
99         int outbuflen;                          /* number of meaningful bytes in output buffer */
100         int outbufsize;                         /* number of bytes allocated to output buffer */
101
102         time_t last_ping_time;          /* last time we saw some activity from the other end or pinged them */
103         time_t last_flushed_time;       /* last time buffer was empty. Only meaningful if outbuflen > 0 */
104
105         avl_tree_t *config_tree;        /* Pointer to configuration tree belonging to him */
106 } connection_t;
107
108 extern avl_tree_t *connection_tree;
109 extern connection_t *broadcast;
110
111 extern void init_connections(void);
112 extern void exit_connections(void);
113 extern connection_t *new_connection(void) __attribute__ ((__malloc__));
114 extern void free_connection(connection_t *);
115 extern void connection_add(connection_t *);
116 extern void connection_del(connection_t *);
117 extern void dump_connections(void);
118 extern bool read_connection_config(connection_t *);
119
120 #endif                                                  /* __TINC_CONNECTION_H__ */