n2n_net.h

/*
 * (C) 2007-09 - Luca Deri <deri@ntop.org>
 *               Richard Andrews <andrews@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:
 *    Babak Farrokhi <babak@farrokhi.net> [FreeBSD port]
 *    Lukasz Taczuk
 *
 */

#ifndef N2N_NET_H_
#define N2N_NET_H_



#ifndef WIN32
#include <netdb.h>//TODO ???

#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <pthread.h>

#ifdef __FreeBSD__
#include <netinet/in_systm.h>
#endif /* #ifdef __FreeBSD__ */


/* *********************************************** */
/* Layer 2 */

#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;


//#define N2N_MAC_SIZE                    6
typedef uint8_t n2n_mac_t[ETH_ADDR_LEN];


/** Common type used to hold stringified MAC addresses. */
#define N2N_MACSTR_SIZE 32
typedef char macstr_t[N2N_MACSTR_SIZE];


#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>

#endif /* #ifndef WIN32 */


int is_broadcast_mac(const uint8_t *mac);
int is_multicast_mac(const uint8_t *mac);
int is_ipv6_multicast_mac(const uint8_t *mac);

extern uint8_t is_multi_broadcast_mac(const uint8_t *dest_mac);

extern char *macaddr_str(macstr_t buf, const n2n_mac_t mac);
extern int   str2mac( uint8_t *outmac /* 6 bytes */, const char *s);


/* *********************************************** */
/* Layer 3 */

#define IPV4_SIZE    4
#define IPV6_SIZE    16

/** Common type used to hold stringified IP addresses. */
typedef char ipstr_t[32];


extern char *intoa(uint32_t addr, char *buf, uint16_t buf_len);


/* *********************************************** */
/* Layer 4 */

#define DEFAULT_MTU   1400


#ifndef WIN32
#define closesocket(a) close(a)
#define SOCKET int
#endif /* #ifndef WIN32 */


struct n2n_sock
{
    uint8_t     family;         /* AF_INET or AF_INET6; or 0 if invalid */
    uint16_t    port;           /* host order */
    union
    {
        uint8_t v6[IPV6_SIZE];  /* byte sequence */
        uint8_t v4[IPV4_SIZE];  /* byte sequence */
    } addr;
};

typedef struct n2n_sock n2n_sock_t;


#define N2N_SOCKBUF_SIZE    64   /* string representation of INET or INET6 sockets */

typedef char n2n_sock_str_t[N2N_SOCKBUF_SIZE]; /* tracing string buffer */


/* functions */
extern SOCKET open_socket(int local_port, int bind_any);

extern ssize_t sendto_sock(int         sock_fd,
                           const void *pktbuf,
                           size_t      pktsize,
                           const n2n_sock_t *dest);

extern int is_empty_ip_address(const n2n_sock_t *sock);

extern int sock_equal(const n2n_sock_t *a, const n2n_sock_t *b);

extern char*       sock_to_cstr(n2n_sock_str_t out, const n2n_sock_t *sock);
extern n2n_sock_t* sock_from_cstr(n2n_sock_t *out,  const n2n_sock_str_t str);


#endif /* N2N_NET_H_ */