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173 lines
3.2 KiB
C
173 lines
3.2 KiB
C
/*
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* eth-bsd.c
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*
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* Copyright (c) 2001 Dug Song <dugsong@monkey.org>
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*
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* $Id: eth-bsd.c 630 2006-02-02 04:17:39Z dugsong $
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*/
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#include "config.h"
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#include <sys/param.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 <sys/time.h>
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#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_ROUTE_RT_MSGHDR)
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#include <sys/sysctl.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#endif
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#include <net/bpf.h>
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#include <net/if.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.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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char device[16];
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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 ifreq ifr;
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char file[32];
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eth_t *e;
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int i;
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if ((e = calloc(1, sizeof(*e))) != NULL) {
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for (i = 0; i < 128; i++) {
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snprintf(file, sizeof(file), "/dev/bpf%d", i);
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/* This would be O_WRONLY, but Mac OS X 10.6 has a bug
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where that prevents other users of the interface
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from seeing incoming traffic, even in other
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processes. */
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e->fd = open(file, O_RDWR);
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if (e->fd != -1 || errno != EBUSY)
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break;
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}
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if (e->fd < 0)
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return (eth_close(e));
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memset(&ifr, 0, sizeof(ifr));
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strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
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if (ioctl(e->fd, BIOCSETIF, (char *)&ifr) < 0)
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return (eth_close(e));
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#ifdef BIOCSHDRCMPLT
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i = 1;
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if (ioctl(e->fd, BIOCSHDRCMPLT, &i) < 0)
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return (eth_close(e));
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#endif
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strlcpy(e->device, device, sizeof(e->device));
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}
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return (e);
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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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#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_ROUTE_RT_MSGHDR)
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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 if_msghdr *ifm;
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struct sockaddr_dl *sdl;
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struct addr ha;
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u_char *p, *buf;
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size_t len;
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int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
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if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
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return (-1);
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if ((buf = malloc(len)) == NULL)
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return (-1);
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if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
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free(buf);
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return (-1);
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}
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for (p = buf; p < buf + len; p += ifm->ifm_msglen) {
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ifm = (struct if_msghdr *)p;
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sdl = (struct sockaddr_dl *)(ifm + 1);
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if (ifm->ifm_type != RTM_IFINFO ||
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(ifm->ifm_addrs & RTA_IFP) == 0)
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continue;
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if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
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memcmp(sdl->sdl_data, e->device, sdl->sdl_nlen) != 0)
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continue;
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if (addr_ston((struct sockaddr *)sdl, &ha) == 0)
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break;
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}
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free(buf);
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if (p >= buf + len) {
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errno = ESRCH;
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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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#else
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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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errno = ENOSYS;
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return (-1);
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}
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#endif
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#if defined(SIOCSIFLLADDR)
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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 ifreq ifr;
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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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memset(&ifr, 0, sizeof(ifr));
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strlcpy(ifr.ifr_name, e->device, sizeof(ifr.ifr_name));
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addr_ntos(&ha, &ifr.ifr_addr);
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return (ioctl(e->fd, SIOCSIFLLADDR, &ifr));
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}
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#else
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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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errno = ENOSYS;
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return (-1);
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}
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#endif
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