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