2 connection.h -- header for connection.c
3 Copyright (C) 2000-2006 Guus Sliepen <guus@tinc-vpn.org>,
4 2000-2005 Ivo Timmermans
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.
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.
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.
23 #ifndef __TINC_CONNECTION_H__
24 #define __TINC_CONNECTION_H__
26 #include <openssl/rsa.h>
27 #include <openssl/evp.h>
31 #include "splay_tree.h"
33 #define OPTION_INDIRECT 0x0001
34 #define OPTION_TCPONLY 0x0002
35 #define OPTION_PMTU_DISCOVERY 0x0004
37 typedef union connection_status_t {
39 int pinged:1; /* sent ping */
40 int active:1; /* 1 if active.. */
41 int connecting:1; /* 1 if we are waiting for a non-blocking connect() to finish */
42 int termreq:1; /* the termination of this connection was requested */
43 int remove:1; /* Set to 1 if you want this connection removed */
44 int timeout:1; /* 1 if gotten timeout */
45 int encryptout:1; /* 1 if we can encrypt outgoing traffic */
46 int decryptin:1; /* 1 if we have to decrypt incoming traffic */
47 int mst:1; /* 1 if this connection is part of a minimum spanning tree */
51 } connection_status_t;
58 typedef struct connection_t {
59 char *name; /* name he claims to have */
61 union sockaddr_t address; /* his real (internet) ip */
62 char *hostname; /* the hostname of its real ip */
63 int protocol_version; /* used protocol */
65 struct event ev; /* events on this metadata connection */
66 int socket; /* socket used for this connection */
67 long int options; /* options for this connection */
68 connection_status_t status; /* status info */
69 int estimated_weight; /* estimation for the weight of the edge for this connection */
70 struct timeval start; /* time this connection was started, used for above estimation */
71 struct outgoing_t *outgoing; /* used to keep track of outgoing connections */
73 struct node_t *node; /* node associated with the other end */
74 struct edge_t *edge; /* edge associated with this connection */
76 RSA *rsa_key; /* his public/private key */
77 const EVP_CIPHER *incipher; /* Cipher he will use to send data to us */
78 const EVP_CIPHER *outcipher; /* Cipher we will use to send data to him */
79 EVP_CIPHER_CTX *inctx; /* Context of encrypted meta data that will come from him to us */
80 EVP_CIPHER_CTX *outctx; /* Context of encrypted meta data that will be sent from us to him */
81 char *inkey; /* His symmetric meta key + iv */
82 char *outkey; /* Our symmetric meta key + iv */
83 int inkeylength; /* Length of his key + iv */
84 int outkeylength; /* Length of our key + iv */
85 const EVP_MD *indigest;
86 const EVP_MD *outdigest;
91 char *mychallenge; /* challenge we received from him */
92 char *hischallenge; /* challenge we sent to him */
94 char buffer[MAXBUFSIZE]; /* metadata input buffer */
95 int buflen; /* bytes read into buffer */
96 int reqlen; /* length of incoming request */
97 int tcplen; /* length of incoming TCPpacket */
98 int allow_request; /* defined if there's only one request possible */
100 char *outbuf; /* metadata output buffer */
101 int outbufstart; /* index of first meaningful byte in output buffer */
102 int outbuflen; /* number of meaningful bytes in output buffer */
103 int outbufsize; /* number of bytes allocated to output buffer */
104 struct event outev; /* events on this metadata connection */
106 time_t last_ping_time; /* last time we saw some activity from the other end or pinged them */
108 splay_tree_t *config_tree; /* Pointer to configuration tree belonging to him */
111 extern splay_tree_t *connection_tree;
112 extern connection_t *broadcast;
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 bool read_connection_config(connection_t *);
123 #endif /* __TINC_CONNECTION_H__ */