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eth-ndd.c

/*
 * eth-ndd.c
 *
 * Copyright (c) 2001 Dug Song <dugsong@monkey.org>
 *
 * $Id: eth-ndd.c,v 1.7 2005/01/25 21:30:40 dugsong Exp $
 */

#include "config.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ndd_var.h>
#include <sys/kinfo.h>

#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "dnet.h"

struct eth_handle {
      char  device[16];
      int   fd;
};

eth_t *
eth_open(const char *device)
{
      struct sockaddr_ndd_8022 sa;
      eth_t *e;
      
      if ((e = calloc(1, sizeof(*e))) == NULL)
            return (NULL);

      if ((e->fd = socket(AF_NDD, SOCK_DGRAM, NDD_PROT_ETHER)) < 0)
            return (eth_close(e));
      
      sa.sndd_8022_family = AF_NDD;
        sa.sndd_8022_len = sizeof(sa);
      sa.sndd_8022_filtertype = NS_ETHERTYPE;
      sa.sndd_8022_ethertype = ETH_TYPE_IP;
      sa.sndd_8022_filterlen = sizeof(struct ns_8022);
      strlcpy(sa.sndd_8022_nddname, device, sizeof(sa.sndd_8022_nddname));
      
      if (bind(e->fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)
            return (eth_close(e));
      
      if (connect(e->fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)
            return (eth_close(e));
      
      /* XXX - SO_BROADCAST needed? */
      
      return (e);
}

ssize_t
eth_send(eth_t *e, const void *buf, size_t len)
{
      return (write(e->fd, buf, len));
}

eth_t *
eth_close(eth_t *e)
{
      if (e != NULL) {
            if (e->fd >= 0)
                  close(e->fd);
            free(e);
      }
      return (NULL);
}

int
eth_get(eth_t *e, eth_addr_t *ea)
{
      struct kinfo_ndd *nddp;
      int size;
      void *end;
      
      if ((size = getkerninfo(KINFO_NDD, 0, 0, 0)) == 0) {
            errno = ENOENT;
            return (-1);
      } else if (size < 0)
            return (-1);
      
      if ((nddp = malloc(size)) == NULL)
            return (-1);
                     
      if (getkerninfo(KINFO_NDD, nddp, &size, 0) < 0) {
            free(nddp);
            return (-1);
      }
      for (end = (void *)nddp + size; (void *)nddp < end; nddp++) {
            if (strcmp(nddp->ndd_alias, e->device) == 0 ||
                strcmp(nddp->ndd_name, e->device) == 0) {
                  memcpy(ea, nddp->ndd_addr, sizeof(*ea));
            }
      }
      free(nddp);
      
      if ((void *)nddp >= end) {
            errno = ESRCH;
            return (-1);
      }
      return (0);
}

int
eth_set(eth_t *e, const eth_addr_t *ea)
{
      errno = ENOSYS;
      return (-1);
}

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