/* net.h -- header for net.c Copyright (C) 1998,99 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef __TINC_NET_H__ #define __TINC_NET_H__ #include #include "config.h" #include "conf.h" #define MAXSIZE 1700 /* should be a bit more than the MTU for the tapdevice */ #define MTU 1600 #define MAC_ADDR_S "%02x:%02x:%02x:%02x:%02x:%02x" #define MAC_ADDR_V(x) ((unsigned char*)&(x))[0],((unsigned char*)&(x))[1], \ ((unsigned char*)&(x))[2],((unsigned char*)&(x))[3], \ ((unsigned char*)&(x))[4],((unsigned char*)&(x))[5] #define IP_ADDR_S "%d.%d.%d.%d" #ifdef WORDS_BIGENDIAN # define IP_ADDR_V(x) ((unsigned char*)&(x))[0],((unsigned char*)&(x))[1], \ ((unsigned char*)&(x))[2],((unsigned char*)&(x))[3] #else # define IP_ADDR_V(x) ((unsigned char*)&(x))[3],((unsigned char*)&(x))[2], \ ((unsigned char*)&(x))[1],((unsigned char*)&(x))[0] #endif #define MAXBUFSIZE 2048 /* Probably way too much, but it must fit every possible request. */ typedef unsigned long ip_t; typedef short length_t; typedef struct vpn_packet_t { length_t len; /* the actual number of bytes in the `data' field */ unsigned char data[MAXSIZE]; } vpn_packet_t; typedef struct real_packet_t { length_t len; /* the length of the entire packet */ ip_t from; /* where the packet came from */ vpn_packet_t data; /* encrypted vpn_packet_t */ } real_packet_t; typedef struct passphrase_t { unsigned short len; unsigned char *phrase; } passphrase_t; typedef struct status_bits_t { int pinged:1; /* sent ping */ int got_pong:1; /* received pong */ int meta:1; /* meta connection exists */ int active:1; /* 1 if active.. */ int outgoing:1; /* I myself asked for this conn */ int termreq:1; /* the termination of this connection was requested */ int remove:1; /* Set to 1 if you want this connection removed */ int timeout:1; /* 1 if gotten timeout */ int validkey:1; /* 1 if we currently have a valid key for him */ int waitingforkey:1; /* 1 if we already sent out a request */ int dataopen:1; /* 1 if we have a valid UDP connection open */ int unused:22; } status_bits_t; typedef struct queue_element_t { void *packet; struct queue_element_t *prev; struct queue_element_t *next; } queue_element_t; typedef struct packet_queue_t { queue_element_t *head; queue_element_t *tail; } packet_queue_t; typedef struct enc_key_t { int length; char *key; time_t expiry; } enc_key_t; typedef struct conn_list_t { ip_t vpn_ip; /* his vpn ip */ ip_t vpn_mask; /* his vpn network address */ ip_t real_ip; /* his real (internet) ip */ char *hostname; /* the hostname of its real ip */ short unsigned int port; /* his portnumber */ int socket; /* our udp vpn socket */ int meta_socket; /* our tcp meta socket */ int protocol_version; /* used protocol */ status_bits_t status; /* status info */ passphrase_t *pp; /* encoded passphrase */ packet_queue_t *sq; /* pending outgoing packets */ packet_queue_t *rq; /* pending incoming packets (they have no valid key to be decrypted with) */ enc_key_t *public_key; /* the other party's public key */ enc_key_t *key; /* encrypt with this key */ char buffer[MAXBUFSIZE]; /* metadata input buffer */ int buflen; /* bytes read into buffer */ int reqlen; /* length of first request in buffer */ struct conn_list_t *nexthop; /* nearest meta-hop in this direction */ struct conn_list_t *next; /* after all, it's a list of connections */ } conn_list_t; extern int tap_fd; extern int total_tap_in; extern int total_tap_out; extern int total_socket_in; extern int total_socket_out; extern conn_list_t *conn_list; extern conn_list_t *myself; extern int send_packet(ip_t, vpn_packet_t *); extern int send_broadcast(conn_list_t *, vpn_packet_t *); extern int setup_network_connections(void); extern void close_network_connections(void); extern void main_loop(void); extern int setup_vpn_connection(conn_list_t *); extern void terminate_connection(conn_list_t *); extern void flush_queues(conn_list_t*); #endif /* __TINC_NET_H__ */