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332 lines
11 KiB
332 lines
11 KiB
/**
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* (C) 2007-18 - ntop.org and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not see see <http://www.gnu.org/licenses/>
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*
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*/
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#ifndef _N2N_H_
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#define _N2N_H_
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/*
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tunctl -t tun0
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tunctl -t tun1
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ifconfig tun0 1.2.3.4 up
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ifconfig tun1 1.2.3.5 up
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./edge -d tun0 -l 2000 -r 127.0.0.1:3000 -c hello
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./edge -d tun1 -l 3000 -r 127.0.0.1:2000 -c hello
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tunctl -u UID -t tunX
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*/
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/* #define N2N_CAN_NAME_IFACE */
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/* Moved here to define _CRT_SECURE_NO_WARNINGS before all the including takes place */
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#ifdef WIN32
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#include "win32/n2n_win32.h"
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#include "win32/winconfig.h"
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#undef N2N_HAVE_DAEMON
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#undef N2N_HAVE_SETUID
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#else
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#include "config.h"
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#endif
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#define PACKAGE_BUILDDATE (__DATE__ " " __TIME__)
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#include <time.h>
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#include <ctype.h>
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#include <stdlib.h>
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#ifndef WIN32
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#include <netdb.h>
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#endif
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#ifndef _MSC_VER
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#include <getopt.h>
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#endif /* #ifndef _MSC_VER */
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifndef WIN32
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <pthread.h>
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#ifdef __linux__
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#define N2N_CAN_NAME_IFACE 1
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#endif /* #ifdef __linux__ */
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#ifdef __FreeBSD__
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#include <netinet/in_systm.h>
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#endif /* #ifdef __FreeBSD__ */
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#include <syslog.h>
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#include <sys/wait.h>
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#define ETH_ADDR_LEN 6
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struct ether_hdr
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{
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uint8_t dhost[ETH_ADDR_LEN];
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uint8_t shost[ETH_ADDR_LEN];
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uint16_t type; /* higher layer protocol encapsulated */
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} __attribute__ ((__packed__));
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typedef struct ether_hdr ether_hdr_t;
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#ifdef __ANDROID_NDK__
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#undef N2N_HAVE_DAEMON
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#undef N2N_HAVE_SETUID
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#undef N2N_CAN_NAME_IFACE
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#endif /* #ifdef __ANDROID_NDK__ */
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <signal.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <assert.h>
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#include <sys/stat.h>
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#include "minilzo.h"
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#define closesocket(a) close(a)
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#endif /* #ifndef WIN32 */
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#include <string.h>
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#include <stdarg.h>
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#include "uthash.h"
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#ifdef WIN32
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#include "win32/wintap.h"
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#endif /* #ifdef WIN32 */
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#include "n2n_wire.h"
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#include "n2n_transforms.h"
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/* N2N_IFNAMSIZ is needed on win32 even if dev_name is not used after declaration */
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#define N2N_IFNAMSIZ 16 /* 15 chars * NULL */
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#ifndef WIN32
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typedef struct tuntap_dev {
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int fd;
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uint8_t mac_addr[6];
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uint32_t ip_addr, device_mask;
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uint16_t mtu;
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char dev_name[N2N_IFNAMSIZ];
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} tuntap_dev;
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#define SOCKET int
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#endif /* #ifndef WIN32 */
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#define QUICKLZ 1
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/* N2N packet header indicators. */
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#define MSG_TYPE_REGISTER 1
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#define MSG_TYPE_DEREGISTER 2
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#define MSG_TYPE_PACKET 3
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#define MSG_TYPE_REGISTER_ACK 4
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#define MSG_TYPE_REGISTER_SUPER 5
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#define MSG_TYPE_REGISTER_SUPER_ACK 6
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#define MSG_TYPE_REGISTER_SUPER_NAK 7
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#define MSG_TYPE_FEDERATION 8
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/* Set N2N_COMPRESSION_ENABLED to 0 to disable lzo1x compression of ethernet
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* frames. Doing this will break compatibility with the standard n2n packet
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* format so do it only for experimentation. All edges must be built with the
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* same value if they are to understand each other. */
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#define N2N_COMPRESSION_ENABLED 1
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#define DEFAULT_MTU 1400
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/** Common type used to hold stringified IP addresses. */
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typedef char ipstr_t[32];
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/** Common type used to hold stringified MAC addresses. */
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#define N2N_MACSTR_SIZE 32
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typedef char macstr_t[N2N_MACSTR_SIZE];
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struct peer_info {
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struct peer_info * next;
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n2n_community_t community_name;
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n2n_mac_t mac_addr;
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n2n_sock_t sock;
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time_t last_seen;
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};
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struct n2n_edge; /* defined in edge.c */
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typedef struct n2n_edge n2n_edge_t;
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#define N2N_EDGE_SN_HOST_SIZE 48
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#define N2N_EDGE_NUM_SUPERNODES 2
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#define N2N_EDGE_SUP_ATTEMPTS 3 /* Number of failed attmpts before moving on to next supernode. */
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#define N2N_PATHNAME_MAXLEN 256
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#define N2N_MAX_TRANSFORMS 16
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#define N2N_EDGE_MGMT_PORT 5644
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typedef char n2n_sn_name_t[N2N_EDGE_SN_HOST_SIZE];
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struct n2n_edge {
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int daemon; /**< Non-zero if edge should detach and run in the background. */
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int preferred_aes; /**< Non-zero if AES is the preferred encryption meothd. */
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uint8_t re_resolve_supernode_ip;
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n2n_sock_t supernode;
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size_t sn_idx; /**< Currently active supernode. */
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size_t sn_num; /**< Number of supernode addresses defined. */
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n2n_sn_name_t sn_ip_array[N2N_EDGE_NUM_SUPERNODES];
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int sn_wait; /**< Whether we are waiting for a supernode response. */
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n2n_community_t community_name; /**< The community. 16 full octets. */
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char keyschedule[N2N_PATHNAME_MAXLEN];
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int null_transop; /**< Only allowed if no key sources defined. */
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int udp_sock;
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int udp_mgmt_sock; /**< socket for status info. */
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int udp_multicast_sock; /**< socket for local multicast registrations. */
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tuntap_dev device; /**< All about the TUNTAP device */
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int dyn_ip_mode; /**< Interface IP address is dynamically allocated, eg. DHCP. */
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int allow_routing; /**< Accept packet no to interface address. */
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int drop_multicast; /**< Multicast ethernet addresses. */
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n2n_trans_op_t transop[N2N_MAX_TRANSFORMS]; /* one for each transform at fixed positions */
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size_t tx_transop_idx; /**< The transop to use when encoding. */
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n2n_sock_t multicast_peer; /**< Multicast peer group (for local edges) */
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struct peer_info * known_peers; /**< Edges we are connected to. */
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struct peer_info * pending_peers; /**< Edges we have tried to register with. */
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time_t last_register_req; /**< Check if time to re-register with super*/
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size_t register_lifetime; /**< Time distance after last_register_req at which to re-register. */
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time_t last_p2p; /**< Last time p2p traffic was received. */
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time_t last_sup; /**< Last time a packet arrived from supernode. */
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size_t sup_attempts; /**< Number of remaining attempts to this supernode. */
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n2n_cookie_t last_cookie; /**< Cookie sent in last REGISTER_SUPER. */
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time_t start_time; /**< For calculating uptime */
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/* Statistics */
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size_t tx_p2p;
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size_t rx_p2p;
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size_t tx_sup;
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size_t rx_sup;
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};
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/* ************************************** */
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#ifdef __ANDROID_NDK__
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#include <android/log.h>
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#endif /* #ifdef __ANDROID_NDK__ */
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#ifndef TRACE_ERROR
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#define TRACE_ERROR 0, __FILE__, __LINE__
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#define TRACE_WARNING 1, __FILE__, __LINE__
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#define TRACE_NORMAL 2, __FILE__, __LINE__
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#define TRACE_INFO 3, __FILE__, __LINE__
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#define TRACE_DEBUG 4, __FILE__, __LINE__
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#endif
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/* ************************************** */
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#define SUPERNODE_IP "127.0.0.1"
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#define SUPERNODE_PORT 1234
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/* ************************************** */
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#ifndef max
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#define max(a, b) ((a < b) ? b : a)
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#endif
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#ifndef min
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#define min(a, b) ((a > b) ? b : a)
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#endif
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/* ************************************** */
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/* Log */
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void setTraceLevel(int level);
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void setUseSyslog(int use_syslog);
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int getTraceLevel();
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void traceEvent(int eventTraceLevel, char* file, int line, char * format, ...);
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/* Tuntap API */
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int tuntap_open(tuntap_dev *device, char *dev, const char *address_mode, char *device_ip,
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char *device_mask, const char * device_mac, int mtu);
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int tuntap_read(struct tuntap_dev *tuntap, unsigned char *buf, int len);
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int tuntap_write(struct tuntap_dev *tuntap, unsigned char *buf, int len);
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void tuntap_close(struct tuntap_dev *tuntap);
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void tuntap_get_address(struct tuntap_dev *tuntap);
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/* Utils */
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char* intoa(uint32_t addr, char* buf, uint16_t buf_len);
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char* macaddr_str(macstr_t buf, const n2n_mac_t mac);
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int str2mac( uint8_t * outmac /* 6 bytes */, const char * s );
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uint8_t is_multi_broadcast(const uint8_t * dest_mac);
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char* msg_type2str(uint16_t msg_type);
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void hexdump(const uint8_t * buf, size_t len);
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void print_n2n_version();
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void supernode2addr(n2n_sock_t * sn, const n2n_sn_name_t addrIn);
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int is_empty_ip_address(const n2n_sock_t * sock);
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const char *random_device_mac(void);
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/* Sockets */
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char* sock_to_cstr( n2n_sock_str_t out,
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const n2n_sock_t * sock );
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SOCKET open_socket(int local_port, int bind_any);
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int sock_equal( const n2n_sock_t * a,
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const n2n_sock_t * b );
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/* Operations on peer_info lists. */
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struct peer_info * find_peer_by_mac( struct peer_info * list,
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const n2n_mac_t mac );
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void peer_list_add( struct peer_info * * list,
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struct peer_info * newp );
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size_t peer_list_size( const struct peer_info * list );
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size_t purge_peer_list( struct peer_info ** peer_list,
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time_t purge_before );
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size_t clear_peer_list( struct peer_info ** peer_list );
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size_t purge_expired_registrations( struct peer_info ** peer_list );
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void update_peer_address(n2n_edge_t * eee,
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uint8_t from_supernode,
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const n2n_mac_t mac,
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const n2n_sock_t * peer,
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time_t when);
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/* Public functions */
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int edge_init_keyschedule(n2n_edge_t * eee);
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void send_packet2net(n2n_edge_t * eee,
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uint8_t *tap_pkt, size_t len);
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int edge_init_encryption(n2n_edge_t * eee, uint8_t *encrypt_pwd, uint32_t encrypt_pwd_len);
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int edge_init_sockets(n2n_edge_t *eee, int udp_local_port, int mgmt_port);
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int edge_init(n2n_edge_t * eee);
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void edge_term(n2n_edge_t * eee);
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int run_edge_loop(n2n_edge_t * eee, int *keep_running);
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int quick_edge_init(char *device_name, char *community_name,
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char *encrypt_key, char *device_mac,
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char *local_ip_address,
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char *supernode_ip_address_port,
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int *keep_on_running);
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#endif /* _N2N_H_ */
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