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/*
* eth-snoop.c
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
* $Id: eth-snoop.c 548 2005-01-30 06:01:57Z dugsong $
*/
#include "config.h"
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/raw.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "dnet.h"
struct eth_handle {
int fd;
struct ifreq ifr;
};
eth_t *
eth_open(const char *device)
{
struct sockaddr_raw sr;
eth_t *e;
int n;
if ((e = calloc(1, sizeof(*e))) == NULL)
return (NULL);
if ((e->fd = socket(PF_RAW, SOCK_RAW, RAWPROTO_SNOOP)) < 0)
return (eth_close(e));
memset(&sr, 0, sizeof(sr));
sr.sr_family = AF_RAW;
strlcpy(sr.sr_ifname, device, sizeof(sr.sr_ifname));
if (bind(e->fd, (struct sockaddr *)&sr, sizeof(sr)) < 0)
return (eth_close(e));
n = 60000;
if (setsockopt(e->fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) < 0)
return (eth_close(e));
strlcpy(e->ifr.ifr_name, device, sizeof(e->ifr.ifr_name));
return (e);
}
int
eth_get(eth_t *e, eth_addr_t *ea)
{
struct addr ha;
if (ioctl(e->fd, SIOCGIFADDR, &e->ifr) < 0)
return (-1);
if (addr_ston(&e->ifr.ifr_addr, &ha) < 0)
return (-1);
if (ha.addr_type != ADDR_TYPE_ETH) {
errno = EINVAL;
return (-1);
}
memcpy(ea, &ha.addr_eth, sizeof(*ea));
return (0);
}
int
eth_set(eth_t *e, const eth_addr_t *ea)
{
struct addr ha;
ha.addr_type = ADDR_TYPE_ETH;
ha.addr_bits = ETH_ADDR_BITS;
memcpy(&ha.addr_eth, ea, ETH_ADDR_LEN);
if (addr_ntos(&ha, &e->ifr.ifr_addr) < 0)
return (-1);
return (ioctl(e->fd, SIOCSIFADDR, &e->ifr));
}
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);
}
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