Fix warning message when setting SO_RCVBUF or SO_SNDBUF fails.
[tinc] / src / connection.h
1 /*
2     connection.h -- header for connection.c
3     Copyright (C) 2000-2010 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 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.
19 */
20
21 #ifndef __TINC_CONNECTION_H__
22 #define __TINC_CONNECTION_H__
23
24 #include <openssl/rsa.h>
25 #include <openssl/evp.h>
26
27 #include "avl_tree.h"
28
29 #define OPTION_INDIRECT         0x0001
30 #define OPTION_TCPONLY          0x0002
31 #define OPTION_PMTU_DISCOVERY   0x0004
32 #define OPTION_CLAMP_MSS        0x0008
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 unused:23;
45 } connection_status_t;
46
47 #include "edge.h"
48 #include "list.h"
49 #include "net.h"
50 #include "node.h"
51
52 typedef struct connection_t {
53         char *name;                                     /* name he claims to have */
54
55         union sockaddr_t address;                       /* his real (internet) ip */
56         char *hostname;                         /* the hostname of its real ip */
57         int protocol_version;           /* used protocol */
58
59         int socket;                                     /* socket used for this connection */
60         uint32_t options;                       /* options for this connection */
61         connection_status_t status;     /* status info */
62         int estimated_weight;           /* estimation for the weight of the edge for this connection */
63         struct timeval start;           /* time this connection was started, used for above estimation */
64         struct outgoing_t *outgoing;    /* used to keep track of outgoing connections */
65
66         struct node_t *node;            /* node associated with the other end */
67         struct edge_t *edge;            /* edge associated with this connection */
68
69         RSA *rsa_key;                           /* his public/private key */
70         const EVP_CIPHER *incipher;     /* Cipher he will use to send data to us */
71         const EVP_CIPHER *outcipher;    /* Cipher we will use to send data to him */
72         EVP_CIPHER_CTX *inctx;          /* Context of encrypted meta data that will come from him to us */
73         EVP_CIPHER_CTX *outctx;         /* Context of encrypted meta data that will be sent from us to him */
74         char *inkey;                            /* His symmetric meta key + iv */
75         char *outkey;                           /* Our symmetric meta key + iv */
76         int inkeylength;                        /* Length of his key + iv */
77         int outkeylength;                       /* Length of our key + iv */
78         const EVP_MD *indigest;
79         const EVP_MD *outdigest;
80         int inmaclength;
81         int outmaclength;
82         int incompression;
83         int outcompression;
84         char *mychallenge;                      /* challenge we received from him */
85         char *hischallenge;                     /* challenge we sent to him */
86
87         char buffer[MAXBUFSIZE];        /* metadata input buffer */
88         int buflen;                                     /* bytes read into buffer */
89         int reqlen;                                     /* length of incoming request */
90         int tcplen;                                     /* length of incoming TCPpacket */
91         int allow_request;                      /* defined if there's only one request possible */
92
93         char *outbuf;                           /* metadata output buffer */
94         int outbufstart;                        /* index of first meaningful byte in output buffer */
95         int outbuflen;                          /* number of meaningful bytes in output buffer */
96         int outbufsize;                         /* number of bytes allocated to output buffer */
97
98         time_t last_ping_time;          /* last time we saw some activity from the other end or pinged them */
99         time_t last_flushed_time;       /* last time buffer was empty. Only meaningful if outbuflen > 0 */
100
101         avl_tree_t *config_tree;        /* Pointer to configuration tree belonging to him */
102 } connection_t;
103
104 extern avl_tree_t *connection_tree;
105 extern connection_t *broadcast;
106
107 extern void init_connections(void);
108 extern void exit_connections(void);
109 extern connection_t *new_connection(void) __attribute__ ((__malloc__));
110 extern void free_connection(connection_t *);
111 extern void connection_add(connection_t *);
112 extern void connection_del(connection_t *);
113 extern void dump_connections(void);
114
115 #endif                                                  /* __TINC_CONNECTION_H__ */