1 #ifndef TINC_CONNECTION_H
2 #define TINC_CONNECTION_H
5 connection.h -- header for connection.c
6 Copyright (C) 2000-2016 Guus Sliepen <guus@tinc-vpn.org>,
7 2000-2005 Ivo Timmermans
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License along
20 with this program; if not, write to the Free Software Foundation, Inc.,
21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 proxy_passed: 1; /* 1 if we are connecting via a proxy and we have finished talking with it */
45 unsigned int tarpit: 1; /* 1 if the connection should be added to the tarpit */
46 unsigned int unused: 21;
47 } connection_status_t;
53 typedef struct connection_t {
54 char *name; /* name he claims to have */
56 union sockaddr_t address; /* his real (internet) ip */
57 char *hostname; /* the hostname of its real ip */
58 int protocol_version; /* used protocol */
60 int socket; /* socket used for this connection */
61 uint32_t options; /* options for this connection */
62 connection_status_t status; /* status info */
63 int estimated_weight; /* estimation for the weight of the edge for this connection */
64 struct timeval start; /* time this connection was started, used for above estimation */
65 struct outgoing_t *outgoing; /* used to keep track of outgoing connections */
67 struct node_t *node; /* node associated with the other end */
68 struct edge_t *edge; /* edge associated with this connection */
70 RSA *rsa_key; /* his public/private key */
71 const EVP_CIPHER *incipher; /* Cipher he will use to send data to us */
72 const EVP_CIPHER *outcipher; /* Cipher we will use to send data to him */
73 EVP_CIPHER_CTX *inctx; /* Context of encrypted meta data that will come from him to us */
74 EVP_CIPHER_CTX *outctx; /* Context of encrypted meta data that will be sent from us to him */
75 uint64_t inbudget; /* Encrypted bytes send budget */
76 uint64_t outbudget; /* Encrypted bytes receive budget */
77 char *inkey; /* His symmetric meta key + iv */
78 char *outkey; /* Our symmetric meta key + iv */
79 int inkeylength; /* Length of his key + iv */
80 int outkeylength; /* Length of our key + iv */
81 const EVP_MD *indigest;
82 const EVP_MD *outdigest;
87 char *mychallenge; /* challenge we received from him */
88 char *hischallenge; /* challenge we sent to him */
90 char buffer[MAXBUFSIZE]; /* metadata input buffer */
91 int buflen; /* bytes read into buffer */
92 int reqlen; /* length of incoming request */
93 length_t tcplen; /* length of incoming TCPpacket */
94 int allow_request; /* defined if there's only one request possible */
96 char *outbuf; /* metadata output buffer */
97 int outbufstart; /* index of first meaningful byte in output buffer */
98 int outbuflen; /* number of meaningful bytes in output buffer */
99 int outbufsize; /* number of bytes allocated to output buffer */
101 time_t last_ping_time; /* last time we saw some activity from the other end or pinged them */
102 time_t last_flushed_time; /* last time buffer was empty. Only meaningful if outbuflen > 0 */
104 avl_tree_t *config_tree; /* Pointer to configuration tree belonging to him */
107 extern avl_tree_t *connection_tree;
108 extern connection_t *everyone;
110 extern void init_connections(void);
111 extern void exit_connections(void);
112 extern connection_t *new_connection(void) __attribute__((__malloc__));
113 extern void free_connection(connection_t *c);
114 extern void free_connection_partially(connection_t *c);
115 extern void connection_add(connection_t *c);
116 extern void connection_del(connection_t *c);
117 extern void dump_connections(void);