l1axip_l.cpp

/***************************************************************

  BayCom(R)        Packet-Radio fuer IBM PC

  OpenBCM-Mailbox

  -----------------------------------------------
  Ansteuerung AXIP-Mode ueber UDP (Linux/Windows)
  -----------------------------------------------


  Copyright (C)       Florian Radlherr
                      Taubenbergstr. 32
                      83627 Warngau

  Alle Rechte vorbehalten / All Rights Reserved

 ***************************************************************/

#include "baycom.h"

#ifdef __UNIX__
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <netinet/in.h>
#include <netdb.h>
#define closesocket close
#define ws_init()
#else
#include "winsock.h"
void ws_init (void);
#define ENOTCONN    WSAENOTCONN
#define EBADF       WSAEBADF
#define EWOULDBLOCK WSAEWOULDBLOCK
#undef errno
#define errno h_errno
extern WORD wVersionRequested;
extern WSADATA wsaData;
static u_long mode = FIONBIO;
#endif

/*---------------------------------------------------------------------------*/

typedef struct chaxip_t
{
  frame_t *rxloc;
  l1_mode_t *m;
  int sock;                             /* socket descriptor */
  struct sockaddr_in peeraddr_in;       /* for server socket address */
  int channel;
} chaxip_t;

chaxip_t ka[KANAELE];

/*---------------------------------------------------------------------------*/

static const int Crc_ccitt_table[] = {
  0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
  0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
  0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
  0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
  0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
  0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
  0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
  0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
  0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
  0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
  0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
  0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
  0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
  0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
  0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
  0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
  0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
  0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
  0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
  0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
  0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
  0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
  0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
  0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
  0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
  0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
  0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
  0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
  0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
  0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
  0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
  0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

/*---------------------------------------------------------------------------*/

static void append_crc_ccitt (byte *bp, int len)
{
  byte *pp;
  int crc_ = 0xffff;
  int n;
  for (pp = bp, n = len; n; n--)
    crc_ = (crc_ >> 8) ^ Crc_ccitt_table[(crc_ ^ *pp++) & 0xff];
  crc_ ^= 0xffff;
  bp[len] = crc_;
  bp[len+1] = crc_ >> 8;
}

/*---------------------------------------------------------------------------*/

int check_crc_ccitt (const byte *buf, int len)
{
  int crc_ = 0xffff;
  for (; len > 0; len--)
    crc_ = (crc_ >> 8) ^ Crc_ccitt_table[(crc_ ^ *buf++) & 0xff];
  return (crc_ & 0xffff) == 0xf0b8;
}

/*---------------------------------------------------------------------------*/

static char *ipstr (unsigned long adr)
{
  static char str[18];
  char *ipa = (char *) &adr;
  sprintf(str, "%d.%d.%d.%d", ipa[0], ipa[1], ipa[2], ipa[3]);
  return str;
}

/*---------------------------------------------------------------------------*/

static int init_axip (chaxip_t *k, l1_mode_t *mm)
{
  struct hostent *hp;           // pointer to host info for nameserver host
  struct sockaddr_in myaddr_in; // for local socket address
  ws_init();
  // clear out address structures
  memset((char *) &myaddr_in, 0, sizeof(struct sockaddr_in));
  memset((char *) &k->peeraddr_in, 0, sizeof(struct sockaddr_in));
  // Set up the server address.
  if (! (hp = gethostbyname(mm->device)))
  {
    trace(serious, "l1axip", "%s name lookup error", mm->device);
    return 0;
  }
  k->peeraddr_in.sin_family = AF_INET;
  k->peeraddr_in.sin_addr.s_addr = ((struct in_addr *) (hp->h_addr))->s_addr;
  k->peeraddr_in.sin_port = htons(mm->txport);
  trace(report, "l1axip", "%s rxport=%d txport=%d",
    ipstr(k->peeraddr_in.sin_addr.s_addr), mm->port, mm->txport);
  k->sock = socket(AF_INET, SOCK_DGRAM, 0);
  if (k->sock == EOF)
  {
    trace(serious, "l1axip", "create: %s", strerror(errno));
    return 0;
  }
  myaddr_in.sin_family = AF_INET;
  myaddr_in.sin_port = htons(mm->port);
  myaddr_in.sin_addr.s_addr = INADDR_ANY;
  if (bind(k->sock, (struct sockaddr *) &myaddr_in,
      sizeof(struct sockaddr_in)) == -1)
  {
    trace(tr_abbruch, "l1axip", "bind: %s", strerror(errno));
    return 0;
  }
#ifdef __UNIX__
  if (fcntl(k->sock, F_SETFL, O_NONBLOCK) < 0)
  {
    trace(serious, "l1axip", "fcntl: %s", strerror(errno));
    return 0;
  }
  s_set(k->sock, "axip socket", "lrb");
#else
  //WINDOWS Specific!!
  if (ioctlsocket(k->sock, FIONBIO, &mode))
  {
    trace(serious, "socketd", "ioctlsocket: %s", strerror(errno));
    return 0;
  }
#endif
  return 1;
}

/*---------------------------------------------------------------------------*/

//*************************************************************************
//
//  Interface-Routinen
//
//*************************************************************************

/*---------------------------------------------------------------------------*/

void cyclic_axip (int channel)
{
  chaxip_t *k = &ka[channel];
  if (k->sock != EOF)
  {
    int len;
    if (! k->rxloc && bfree) alloc(k->rxloc);
    if (! k->rxloc) return;
    if ((len = recv(k->sock, (char *) k->rxloc->inhalt, MAXLEN - 1, 0)) > 0)
    {
      k->rxloc->channel = channel;
      k->rxloc->len = len - 2;
      k->rxloc->txdtime = 1;
      vornehin(k->rxloc, rxout);
    }
  }
}

/*---------------------------------------------------------------------------*/

int l1state_axip (int channel)
{
  int mask = 0;
  mask |= CH_FDX;
  return mask;
}

/*---------------------------------------------------------------------------*/

void pactx_axip (frame_t *packl)
//*************************************************************************
//
//  legt ein Frame in den Sendepuffer
//
//*************************************************************************
{
  chaxip_t *k = &ka[packl->channel];
  if (k->sock != EOF)
  {
    append_crc_ccitt(packl->inhalt, packl->len);
    if (sendto(k->sock, (char *) packl->inhalt, packl->len + 2, 0,
       (struct sockaddr *) &k->peeraddr_in, sizeof(struct sockaddr_in)) == -1)
      trace(serious, "l1axip", "sendto: %s", strerror(errno));
    packl->channel |= 0x80;
    vornehin(packl, rxout);
  }
}

/*---------------------------------------------------------------------------*/

int l1init_axip (int einschalt)
//*************************************************************************
//
//  initialisiert den AXIP-Mode
//
//*************************************************************************
{
  unsigned int channel;
  chaxip_t *k;
  l1_mode_t *mm;
  if (einschalt)
  {
    for (channel = 0; channel < KANAELE; channel++)
    {
      k = &ka[channel];
      mm = &w.mode[channel];
      memset(k, 0, sizeof(chaxip_t));
      k->m = mm;
      k->channel = channel;
      k->sock = EOF;
      if (mm->chmode == c_axip && init_axip(k,mm))
        trace(report, "l1axip", "initialised to channel %d", channel);
    }
  }
  return 0;
}