2 connection.h -- header for connection.c
3 Copyright (C) 2000-2012 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 along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #ifndef __TINC_CONNECTION_H__
22 #define __TINC_CONNECTION_H__
24 #include <openssl/rsa.h>
25 #include <openssl/evp.h>
29 #define OPTION_INDIRECT 0x0001
30 #define OPTION_TCPONLY 0x0002
31 #define OPTION_PMTU_DISCOVERY 0x0004
32 #define OPTION_CLAMP_MSS 0x0008
34 typedef struct connection_status_t {
35 unsigned int pinged:1; /* sent ping */
36 unsigned int active:1; /* 1 if active.. */
37 unsigned int connecting:1; /* 1 if we are waiting for a non-blocking connect() to finish */
38 unsigned int unused_termreq:1; /* the termination of this connection was requested */
39 unsigned int remove:1; /* Set to 1 if you want this connection removed */
40 unsigned int timeout:1; /* 1 if gotten timeout */
41 unsigned int encryptout:1; /* 1 if we can encrypt outgoing traffic */
42 unsigned int decryptin:1; /* 1 if we have to decrypt incoming traffic */
43 unsigned int mst:1; /* 1 if this connection is part of a minimum spanning tree */
44 unsigned int unused:23;
45 } connection_status_t;
51 typedef struct connection_t {
52 char *name; /* name he claims to have */
54 union sockaddr_t address; /* his real (internet) ip */
55 char *hostname; /* the hostname of its real ip */
56 int protocol_version; /* used protocol */
58 int socket; /* socket used for this connection */
59 uint32_t options; /* options for this connection */
60 connection_status_t status; /* status info */
61 int estimated_weight; /* estimation for the weight of the edge for this connection */
62 struct timeval start; /* time this connection was started, used for above estimation */
63 struct outgoing_t *outgoing; /* used to keep track of outgoing connections */
65 struct node_t *node; /* node associated with the other end */
66 struct edge_t *edge; /* edge associated with this connection */
68 RSA *rsa_key; /* his public/private key */
69 const EVP_CIPHER *incipher; /* Cipher he will use to send data to us */
70 const EVP_CIPHER *outcipher; /* Cipher we will use to send data to him */
71 EVP_CIPHER_CTX *inctx; /* Context of encrypted meta data that will come from him to us */
72 EVP_CIPHER_CTX *outctx; /* Context of encrypted meta data that will be sent from us to him */
73 char *inkey; /* His symmetric meta key + iv */
74 char *outkey; /* Our symmetric meta key + iv */
75 int inkeylength; /* Length of his key + iv */
76 int outkeylength; /* Length of our key + iv */
77 const EVP_MD *indigest;
78 const EVP_MD *outdigest;
83 char *mychallenge; /* challenge we received from him */
84 char *hischallenge; /* challenge we sent to him */
86 char buffer[MAXBUFSIZE]; /* metadata input buffer */
87 int buflen; /* bytes read into buffer */
88 int reqlen; /* length of incoming request */
89 int tcplen; /* length of incoming TCPpacket */
90 int allow_request; /* defined if there's only one request possible */
92 char *outbuf; /* metadata output buffer */
93 int outbufstart; /* index of first meaningful byte in output buffer */
94 int outbuflen; /* number of meaningful bytes in output buffer */
95 int outbufsize; /* number of bytes allocated to output buffer */
97 time_t last_ping_time; /* last time we saw some activity from the other end or pinged them */
98 time_t last_flushed_time; /* last time buffer was empty. Only meaningful if outbuflen > 0 */
100 avl_tree_t *config_tree; /* Pointer to configuration tree belonging to him */
103 extern avl_tree_t *connection_tree;
104 extern connection_t *everyone;
106 extern void init_connections(void);
107 extern void exit_connections(void);
108 extern connection_t *new_connection(void) __attribute__ ((__malloc__));
109 extern void free_connection(connection_t *);
110 extern void free_connection_partially(connection_t *);
111 extern void connection_add(connection_t *);
112 extern void connection_del(connection_t *);
113 extern void dump_connections(void);
115 #endif /* __TINC_CONNECTION_H__ */