text: /*
      connection.h -- header for connection.c
      Copyright (C) 2000-2013 Guus Sliepen <guus@tinc-vpn.org>,
                    2000-2005 Ivo Timmermans
  
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
  
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
  
      You should have received a copy of the GNU General Public License along
      with this program; if not, write to the Free Software Foundation, Inc.,
      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
  
  #ifndef __TINC_CONNECTION_H__
  #define __TINC_CONNECTION_H__
  
  #include "buffer.h"
  #include "cipher.h"
  #include "digest.h"
  #include "rsa.h"
  #include "list.h"
  #include "sptps.h"
  
  #define OPTION_INDIRECT         0x0001
  #define OPTION_TCPONLY          0x0002
  #define OPTION_PMTU_DISCOVERY   0x0004
  #define OPTION_CLAMP_MSS        0x0008
  #define OPTION_VERSION(x) ((x) >> 24) /* Top 8 bits are for protocol minor version */
  
  typedef struct connection_status_t {
  		unsigned int pinged:1;                  /* sent ping */
  		unsigned int unused_active:1;
  		unsigned int connecting:1;              /* 1 if we are waiting for a non-blocking connect() to finish */
  		unsigned int unused_termreq:1;          /* the termination of this connection was requested */
  		unsigned int remove_unused:1;           /* Set to 1 if you want this connection removed */
  		unsigned int timeout_unused:1;          /* 1 if gotten timeout */
  		unsigned int encryptout:1;              /* 1 if we can encrypt outgoing traffic */
  		unsigned int decryptin:1;               /* 1 if we have to decrypt incoming traffic */
  		unsigned int mst:1;                     /* 1 if this connection is part of a minimum spanning tree */
  		unsigned int control:1;                 /* 1 if this is a control connection */
  		unsigned int pcap:1;                    /* 1 if this is a control connection requesting packet capture */
  		unsigned int log:1;                     /* 1 if this is a control connection requesting log dump */
  		unsigned int invitation:1;              /* 1 if this is an invitation */
  		unsigned int invitation_used:1;         /* 1 if the invitation has been consumed */
  		unsigned int unused:18;
  } connection_status_t;
  
  #include "ecdsa.h"
  #include "edge.h"
  #include "net.h"
  #include "node.h"
  
  typedef struct connection_t {
  	char *name;                     /* name he claims to have */
  
  	union sockaddr_t address;       /* his real (internet) ip */
  	char *hostname;                 /* the hostname of its real ip */
  	int protocol_major;             /* used protocol */
  	int protocol_minor;             /* used protocol */
  
  	int socket;                     /* socket used for this connection */
  	uint32_t options;               /* options for this connection */
  	connection_status_t status;     /* status info */
  	int estimated_weight;           /* estimation for the weight of the edge for this connection */
  	struct timeval start;           /* time this connection was started, used for above estimation */
  	struct outgoing_t *outgoing;    /* used to keep track of outgoing connections */
  
  	struct node_t *node;            /* node associated with the other end */
  	struct edge_t *edge;            /* edge associated with this connection */
  
  	rsa_t *rsa;                     /* his public RSA key */
  	ecdsa_t *ecdsa;                 /* his public ECDSA key */
  	cipher_t *incipher;             /* Cipher he will use to send data to us */
  	cipher_t *outcipher;            /* Cipher we will use to send data to him */
  	digest_t *indigest;
  	digest_t *outdigest;
  	sptps_t sptps;
  
  	int inmaclength;
  	int outmaclength;
  	int incompression;
  	int outcompression;
  
  	char *hischallenge;             /* The challenge we sent to him */
  
  	struct buffer_t inbuf;
  	struct buffer_t outbuf;
  	io_t io;                        /* input/output event on this metadata connection */
  	int tcplen;                     /* length of incoming TCPpacket */
  	int allow_request;              /* defined if there's only one request possible */
  
  	time_t last_ping_time;          /* last time we saw some activity from the other end or pinged them */
  
  	splay_tree_t *config_tree;      /* Pointer to configuration tree belonging to him */
  } connection_t;
  
  extern list_t *connection_list;
  extern connection_t *everyone;
  
  extern void init_connections(void);
  extern void exit_connections(void);
  extern connection_t *new_connection(void) __attribute__ ((__malloc__));
  extern void free_connection(connection_t *);
  extern void connection_add(connection_t *);
  extern void connection_del(connection_t *);
  extern bool dump_connections(struct connection_t *);
  
  #endif /* __TINC_CONNECTION_H__ */
  