git.meshlink.io Git - meshlink/blob - 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__ */