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n2n/n2n.h
emanuele-f 60a4ba90ce Add tools subdirectory
2019-09-21 16:13:52 +02:00

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/**
* (C) 2007-18 - ntop.org and contributors
*
* 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 see <http://www.gnu.org/licenses/>
*
*/
#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
*/
/* #define N2N_CAN_NAME_IFACE */
/* Moved here to define _CRT_SECURE_NO_WARNINGS before all the including takes place */
#ifdef WIN32
#include "win32/n2n_win32.h"
#include "win32/winconfig.h"
#define N2N_CAN_NAME_IFACE 1
#undef N2N_HAVE_DAEMON
#undef N2N_HAVE_SETUID
#else
#ifndef CMAKE_BUILD
#include "config.h"
#endif
#endif
#define PACKAGE_BUILDDATE (__DATE__ " " __TIME__)
#include <time.h>
#include <ctype.h>
#include <stdlib.h>
#ifndef WIN32
#include <netdb.h>
#endif
#ifndef _MSC_VER
#include <getopt.h>
#endif /* #ifndef _MSC_VER */
#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>
#define N2N_CAN_NAME_IFACE 1
#endif /* #ifdef __linux__ */
#ifdef __FreeBSD__
#include <netinet/in_systm.h>
#endif /* #ifdef __FreeBSD__ */
#include <syslog.h>
#include <sys/wait.h>
#define ETH_ADDR_LEN 6
struct ether_hdr
{
uint8_t dhost[ETH_ADDR_LEN];
uint8_t shost[ETH_ADDR_LEN];
uint16_t type; /* higher layer protocol encapsulated */
} __attribute__ ((__packed__));
typedef struct ether_hdr ether_hdr_t;
#ifdef __ANDROID_NDK__
#undef N2N_HAVE_DAEMON
#undef N2N_HAVE_SETUID
#undef N2N_CAN_NAME_IFACE
#endif /* #ifdef __ANDROID_NDK__ */
#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>
#include <assert.h>
#include <sys/stat.h>
#include "minilzo.h"
#define closesocket(a) close(a)
#endif /* #ifndef WIN32 */
#include <string.h>
#include <stdarg.h>
#include "uthash.h"
#ifdef WIN32
#include "win32/wintap.h"
#endif /* #ifdef WIN32 */
#include "n2n_wire.h"
#include "n2n_transforms.h"
#ifdef WIN32
#define N2N_IFNAMSIZ 64
#else
#define N2N_IFNAMSIZ 16 /* 15 chars * NULL */
#endif
#ifndef WIN32
typedef struct tuntap_dev {
int fd;
uint8_t mac_addr[6];
uint32_t ip_addr, device_mask;
uint16_t mtu;
char dev_name[N2N_IFNAMSIZ];
} tuntap_dev;
#define SOCKET int
#endif /* #ifndef WIN32 */
#define QUICKLZ 1
/* N2N packet header indicators. */
#define MSG_TYPE_REGISTER 1
#define MSG_TYPE_DEREGISTER 2
#define MSG_TYPE_PACKET 3
#define MSG_TYPE_REGISTER_ACK 4
#define MSG_TYPE_REGISTER_SUPER 5
#define MSG_TYPE_REGISTER_SUPER_ACK 6
#define MSG_TYPE_REGISTER_SUPER_NAK 7
#define MSG_TYPE_FEDERATION 8
#define MSG_TYPE_PEER_INFO 9
#define MSG_TYPE_QUERY_PEER 10
/* Set N2N_COMPRESSION_ENABLED to 0 to disable lzo1x compression of ethernet
* frames. Doing this will break compatibility with the standard n2n packet
* format so do it only for experimentation. All edges must be built with the
* same value if they are to understand each other. */
#define N2N_COMPRESSION_ENABLED 1
#define DEFAULT_MTU 1290
/** Uncomment this to enable the MTU check, then try to ssh to generate a fragmented packet. */
/** NOTE: see doc/MTU.md for an explanation on the 1400 value */
//#define MTU_ASSERT_VALUE 1400
/** Common type used to hold stringified IP addresses. */
typedef char ipstr_t[32];
/** Common type used to hold stringified MAC addresses. */
#define N2N_MACSTR_SIZE 32
typedef char macstr_t[N2N_MACSTR_SIZE];
struct peer_info {
n2n_mac_t mac_addr;
n2n_sock_t sock;
int timeout;
time_t last_seen;
time_t last_p2p;
time_t last_sent_query;
UT_hash_handle hh; /* makes this structure hashable */
};
#define HASH_ADD_PEER(head,add) \
HASH_ADD(hh,head,mac_addr,sizeof(n2n_mac_t),add)
#define HASH_FIND_PEER(head,mac,out) \
HASH_FIND(hh,head,mac,sizeof(n2n_mac_t),out)
#define N2N_EDGE_SN_HOST_SIZE 48
#define N2N_EDGE_NUM_SUPERNODES 2
#define N2N_EDGE_SUP_ATTEMPTS 3 /* Number of failed attmpts before moving on to next supernode. */
#define N2N_PATHNAME_MAXLEN 256
#define N2N_EDGE_MGMT_PORT 5644
typedef char n2n_sn_name_t[N2N_EDGE_SN_HOST_SIZE];
typedef struct n2n_edge_conf {
n2n_sn_name_t sn_ip_array[N2N_EDGE_NUM_SUPERNODES];
n2n_community_t community_name; /**< The community. 16 full octets. */
n2n_transform_t transop_id; /**< The transop to use. */
uint8_t dyn_ip_mode; /**< Interface IP address is dynamically allocated, eg. DHCP. */
uint8_t allow_routing; /**< Accept packet no to interface address. */
uint8_t drop_multicast; /**< Multicast ethernet addresses. */
uint8_t disable_pmtu_discovery; /**< Disable the Path MTU discovery. */
uint8_t allow_p2p; /**< Allow P2P connection */
uint8_t sn_num; /**< Number of supernode addresses defined. */
uint8_t tos; /** TOS for sent packets */
char *encrypt_key;
int register_interval; /**< Interval for supernode registration, also used for UDP NAT hole punching. */
int local_port;
int mgmt_port;
} n2n_edge_conf_t;
typedef struct n2n_edge n2n_edge_t; /* Opaque, see edge_utils.c */
/* ************************************** */
#ifdef __ANDROID_NDK__
#include <android/log.h>
#endif /* #ifdef __ANDROID_NDK__ */
#ifndef TRACE_ERROR
#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 TRACE_DEBUG 4, __FILE__, __LINE__
#endif
/* ************************************** */
#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
/* ************************************** */
/* Transop Init Functions */
int n2n_transop_null_init(const n2n_edge_conf_t *conf, n2n_trans_op_t *ttt);
int n2n_transop_twofish_init(const n2n_edge_conf_t *conf, n2n_trans_op_t *ttt);
#ifdef N2N_HAVE_AES
int n2n_transop_aes_cbc_init(const n2n_edge_conf_t *conf, n2n_trans_op_t *ttt);
#endif
/* Log */
void setTraceLevel(int level);
void setUseSyslog(int use_syslog);
void setTraceFile(FILE *f);
int getTraceLevel();
void traceEvent(int eventTraceLevel, char* file, int line, char * format, ...);
/* Tuntap API */
int tuntap_open(tuntap_dev *device, char *dev, const char *address_mode, char *device_ip,
char *device_mask, const char * device_mac, int mtu);
int tuntap_read(struct tuntap_dev *tuntap, unsigned char *buf, int len);
int tuntap_write(struct tuntap_dev *tuntap, unsigned char *buf, int len);
void tuntap_close(struct tuntap_dev *tuntap);
void tuntap_get_address(struct tuntap_dev *tuntap);
/* Utils */
char* intoa(uint32_t addr, char* buf, uint16_t buf_len);
char* macaddr_str(macstr_t buf, const n2n_mac_t mac);
int str2mac( uint8_t * outmac /* 6 bytes */, const char * s );
uint8_t is_multi_broadcast(const uint8_t * dest_mac);
char* msg_type2str(uint16_t msg_type);
void hexdump(const uint8_t * buf, size_t len);
void print_n2n_version();
int is_empty_ip_address(const n2n_sock_t * sock);
void print_edge_stats(const n2n_edge_t *eee);
/* Sockets */
char* sock_to_cstr( n2n_sock_str_t out,
const n2n_sock_t * sock );
SOCKET open_socket(int local_port, int bind_any);
int sock_equal( const n2n_sock_t * a,
const n2n_sock_t * b );
/* Operations on peer_info lists. */
size_t purge_peer_list( struct peer_info ** peer_list,
time_t purge_before );
size_t clear_peer_list( struct peer_info ** peer_list );
size_t purge_expired_registrations( struct peer_info ** peer_list, time_t* p_last_purge );
/* Edge conf */
void edge_init_conf_defaults(n2n_edge_conf_t *conf);
int edge_verify_conf(const n2n_edge_conf_t *conf);
int edge_conf_add_supernode(n2n_edge_conf_t *conf, const char *ip_and_port);
const n2n_edge_conf_t* edge_get_conf(const n2n_edge_t *eee);
/* Public functions */
n2n_edge_t* edge_init(const tuntap_dev *dev, const n2n_edge_conf_t *conf, int *rv);
void edge_term(n2n_edge_t *eee);
int run_edge_loop(n2n_edge_t *eee, int *keep_running);
int quick_edge_init(char *device_name, char *community_name,
char *encrypt_key, char *device_mac,
char *local_ip_address,
char *supernode_ip_address_port,
int *keep_on_running);
#endif /* _N2N_H_ */
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