/** * (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 * */ #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 #include #include #ifndef WIN32 #include #endif #ifndef _MSC_VER #include #endif /* #ifndef _MSC_VER */ #include #include #include #ifndef WIN32 #include #include #include #include #include #ifdef __linux__ #include #include #define N2N_CAN_NAME_IFACE 1 #endif /* #ifdef __linux__ */ #ifdef __FreeBSD__ #include #endif /* #ifdef __FreeBSD__ */ #include #include #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 #include #include #include #include #include #include #include #include #include #include #include "minilzo.h" #define closesocket(a) close(a) #endif /* #ifndef WIN32 */ #include #include #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 register_ttl; /**< TTL for registration packet when UDP NAT hole punching through supernode. */ int local_port; int mgmt_port; } n2n_edge_conf_t; typedef struct n2n_edge n2n_edge_t; /* Opaque, see edge_utils.c */ typedef struct sn_stats { size_t errors; /* Number of errors encountered. */ size_t reg_super; /* Number of REGISTER_SUPER requests received. */ size_t reg_super_nak; /* Number of REGISTER_SUPER requests declined. */ size_t fwd; /* Number of messages forwarded. */ size_t broadcast; /* Number of messages broadcast to a community. */ time_t last_fwd; /* Time when last message was forwarded. */ time_t last_reg_super; /* Time when last REGISTER_SUPER was received. */ } sn_stats_t; typedef struct n2n_sn { time_t start_time; /* Used to measure uptime. */ sn_stats_t stats; int daemon; /* If non-zero then daemonise. */ uint16_t lport; /* Local UDP port to bind to. */ int sock; /* Main socket for UDP traffic with edges. */ int mgmt_sock; /* management socket. */ int lock_communities; /* If true, only loaded communities can be used. */ struct sn_community *communities; } n2n_sn_t; struct sn_community { char community[N2N_COMMUNITY_SIZE]; struct peer_info *edges; /* Link list of registered edges. */ UT_hash_handle hh; /* makes this structure hashable */ }; /* ************************************** */ #ifdef __ANDROID_NDK__ #include #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); int sn_init(n2n_sn_t *sss); void sn_term(n2n_sn_t *sss); int run_sn_loop(n2n_sn_t *sss, int *keep_running); #endif /* _N2N_H_ */