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n2n/n2n.h
cristian paul peñaranda rojas ce56f3183d Imported Debian version 1.2.2~svn3653
2012-07-21 05:12:26 +00:00

290 lines
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/*
* (C) 2007-08 - Luca Deri <deri@ntop.org>
*
* 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 3 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, see <http://www.gnu.org/licenses/>
*
* Code contributions courtesy of:
* Richard Andrews <bbmaj7@yahoo.com.au>
* Babak Farrokhi <babak@farrokhi.net> [FreeBSD port]
*
*/
#ifndef _N2N_H_
#define _N2N_H_
/*
tunctl -t tun0
tunctl -t tun1
ifconfig tun0 1.2.3.4 up
ifconfig tun1 1.2.3.5 up
./edge -d tun0 -l 2000 -r 127.0.0.1:3000 -c hello
./edge -d tun1 -l 3000 -r 127.0.0.1:2000 -c hello
tunctl -u UID -t tunX
*/
#if defined(__APPLE__) && defined(__MACH__)
#define _DARWIN_
#endif
#ifdef WIN32
#include "win32/n2n_win32.h"
#endif
#include <time.h>
#include <ctype.h>
#include <stdlib.h>
#ifndef WIN32
#include <netdb.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#ifndef WIN32
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <pthread.h>
#ifdef __linux__
#include <linux/if.h>
#include <linux/if_tun.h>
#endif
#ifdef __FreeBSD__
#include <netinet/in_systm.h>
#endif
#include <syslog.h>
#include <sys/wait.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <signal.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <unistd.h>
#define closesocket(a) close(a)
#endif
#include <string.h>
#ifdef WIN32
#include "win32/getopt.h"
#else
#define _GNU_SOURCE
#include <getopt.h>
#endif
#include <stdarg.h>
#ifdef WIN32
#include "win32/wintap.h"
#endif
#include "twofish.h"
#ifndef WIN32
typedef struct tuntap_dev {
int fd;
u_int8_t mac_addr[6];
u_int32_t ip_addr, device_mask;
u_int mtu;
} tuntap_dev;
#define SOCKET int
#endif /* #ifndef WIN32 */
#define QUICKLZ 1
#define N2N_VERSION 1
#define MSG_TYPE_REGISTER 1 /* FIX invece di usare il sender del pacchetto scriverlo nel pacchetto stesso */
#define MSG_TYPE_DEREGISTER 2
#define MSG_TYPE_PACKET 3
#define MSG_TYPE_REGISTER_ACK 4
#define MSG_TYPE_ACK_RESPONSE 5
#define COMMUNITY_LEN 16
#define MIN_COMPRESSED_PKT_LEN 32
/* Maximum enum value is 255 due to marshalling into 1 byte */
enum packet_type {
packet_unreliable_data = 0, /* no ACK needed */
packet_reliable_data, /* needs ACK */
packet_ping,
packet_pong
};
/* All information is always in network byte-order */
struct peer_addr {
u_int8_t family;
u_int16_t port;
union {
u_int8_t v6_addr[16];
u_int32_t v4_addr;
} addr_type;
};
struct n2n_packet_header {
u_int8_t version, msg_type, ttl, sent_by_supernode;
char community_name[COMMUNITY_LEN], src_mac[6], dst_mac[6];
struct peer_addr public_ip, private_ip;
enum packet_type pkt_type;
u_int32_t sequence_id;
u_int32_t crc; // FIX - It needs to be handled for detcting forged packets
};
int marshall_n2n_packet_header( u_int8_t * buf, const struct n2n_packet_header * hdr );
int unmarshall_n2n_packet_header( struct n2n_packet_header * hdr, const u_int8_t * buf );
#define N2N_PKT_HDR_SIZE (sizeof(struct n2n_packet_header))
/** Common type used to hold stringified IP addresses. */
typedef char ipstr_t[32];
/** Common type used to hold stringified MAC addresses. */
typedef char macstr_t[32];
struct n2n_sock_info
{
int sock;
char is_udp_socket /*= 1*/;
};
typedef struct n2n_sock_info n2n_sock_info_t;
struct peer_info {
char community_name[16], mac_addr[6];
struct peer_addr public_ip, private_ip;
time_t last_seen;
struct peer_info *next;
/* socket */
n2n_sock_info_t sinfo;
};
struct n2n_edge; /* defined in edge.c */
typedef struct n2n_edge n2n_edge_t;
/* ************************************** */
#if defined(DEBUG)
#define SOCKET_TIMEOUT_INTERVAL_SECS 5
#define REGISTER_FREQUENCY 20 /* sec */
#else /* #if defined(DEBUG) */
#define SOCKET_TIMEOUT_INTERVAL_SECS 10
#define REGISTER_FREQUENCY 60 /* sec */
#endif /* #if defined(DEBUG) */
#define TRACE_ERROR 0, __FILE__, __LINE__
#define TRACE_WARNING 1, __FILE__, __LINE__
#define TRACE_NORMAL 2, __FILE__, __LINE__
#define TRACE_INFO 3, __FILE__, __LINE__
/* ************************************** */
#define SUPERNODE_IP "127.0.0.1"
#define SUPERNODE_PORT 1234
/* ************************************** */
#ifndef max
#define max(a, b) ((a < b) ? b : a)
#endif
#ifndef min
#define min(a, b) ((a > b) ? b : a)
#endif
/* ************************************** */
/* Variables */
// extern TWOFISH *tf;
extern int traceLevel;
extern char broadcast_addr[6];
extern char multicast_addr[6];
/* Functions */
extern void sockaddr_in2peer_addr(struct sockaddr_in *in, struct peer_addr *out);
extern void peer_addr2sockaddr_in(const struct peer_addr *in, struct sockaddr_in *out);
// extern int init_n2n(u_int8_t *encrypt_pwd, u_int32_t encrypt_pwd_len );
// extern void term_n2n();
extern void send_ack(n2n_sock_info_t * sinfo,
u_int16_t last_rcvd_seq_id,
struct n2n_packet_header *header,
struct peer_addr *remote_peer,
char *src_mac);
extern void traceEvent(int eventTraceLevel, char* file, int line, char * format, ...);
extern int tuntap_open(tuntap_dev *device, char *dev, char *device_ip, char *device_mask, const char * device_mac );
extern int tuntap_read(struct tuntap_dev *tuntap, unsigned char *buf, int len);
extern int tuntap_write(struct tuntap_dev *tuntap, unsigned char *buf, int len);
extern void tuntap_close(struct tuntap_dev *tuntap);
extern SOCKET open_socket(int local_port, int udp_sock, int server_mode);
extern int connect_socket(int sock_fd, struct peer_addr* dest);
extern void send_packet(n2n_sock_info_t * sinfo,
char *packet, size_t *packet_len,
const struct peer_addr *remote_peer,
u_int8_t compress_data);
extern char* intoa(u_int32_t addr, char* buf, u_short buf_len);
extern char* macaddr_str(const char *mac, char *buf, int buf_len);
extern int str2mac( u_int8_t * outmac /* 6 bytes */, const char * s );
extern void fill_standard_header_fields(n2n_sock_info_t * eee,
struct n2n_packet_header *hdr,
char *src_mac);
extern u_int receive_data(n2n_sock_info_t * sinfo,
char *packet, size_t packet_len,
struct peer_addr *from, u_int8_t *discarded_pkt,
char *tun_mac_addr, u_int8_t decompress_data,
struct n2n_packet_header *hdr);
extern u_int reliable_sendto(n2n_sock_info_t * sinfo,
char *packet, size_t *packet_len,
const struct peer_addr *from, u_int8_t compress_data);
extern u_int unreliable_sendto(n2n_sock_info_t * sinfo,
char *packet, size_t *packet_len,
const struct peer_addr *from, u_int8_t compress_data);
extern u_int send_data(n2n_sock_info_t * sinfo,
char *packet, size_t *packet_len,
const struct peer_addr *to, u_int8_t compress_data);
extern u_int8_t is_multi_broadcast(char *dest_mac);
extern char* msg_type2str(u_short msg_type);
extern void hexdump(char *buf, u_int len);
void print_n2n_version();
/* Operations on peer_info lists. */
struct peer_info * find_peer_by_mac( struct peer_info * list,
const char * mac );
void peer_list_add( struct peer_info * * list,
struct peer_info * new );
size_t peer_list_size( const struct peer_info * list );
size_t purge_peer_list( struct peer_info ** peer_list,
time_t purge_before );
size_t purge_expired_registrations( struct peer_info ** peer_list );
/* version.c */
extern char *version, *osName, *buildDate;
#endif /* _N2N_H_ */
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