minix/sys/arch/i386/stand/lib/test/ether_bpf.c

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/* $NetBSD: ether_bpf.c,v 1.10 2008/12/14 18:46:33 christos Exp $ */
/*
* Copyright (c) 1998
* Matthias Drochner. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "sanamespace.h"
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/bpf.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <kvm.h>
#include <nlist.h>
#include <string.h>
#include <err.h>
#include <errno.h>
#include <netif/netif_small.h>
#include <netif/etherdrv.h>
#define BPFDEV "/dev/bpf0"
#define MAXPKT 1536
/*
* Allows to use any configured interface with
* standalone network code. Provides the interface used
* by i386/stand/lib/netif/netif_small.c.
*/
static int bpf = -1;
static struct nlist nl[] = {
{"_ifnet"},
{NULL}
};
int
EtherInit(char *ha)
{
int res;
u_int val;
struct ifreq ifr;
kvm_t *kvm;
char errbuf[_POSIX2_LINE_MAX];
struct ifnet_head ifh;
struct ifnet *ifp;
struct ifaddr *ifap = 0;
struct sockaddr_dl *sdlp;
int sdllen;
bpf = open(BPFDEV, O_RDWR, 0);
if (bpf < 0) {
warn("open %s", BPFDEV);
return 0;
}
val = MAXPKT;
res = ioctl(bpf, BIOCSBLEN, &val);
if (res < 0) {
warn("ioctl BIOCSBLEN");
return 0;
}
val = 1;
res = ioctl(bpf, BIOCIMMEDIATE, &val);
if (res < 0) {
warn("ioctl BIOCIMMEDIATE");
return 0;
}
val = 1;
res = ioctl(bpf, FIONBIO, &val);
if (res < 0) {
warn("ioctl FIONBIO");
return 0;
}
memcpy(ifr.ifr_name, BPF_IFNAME, IFNAMSIZ);
res = ioctl(bpf, BIOCSETIF, &ifr);
if (res < 0) {
warn("ioctl BIOCSETIF %s", BPF_IFNAME);
return 0;
}
kvm = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
if (!kvm) {
warnx(errbuf);
return 0;
}
if (kvm_nlist(kvm, nl) < 0) {
warnx("nlist failed (%s)", kvm_geterr(kvm));
kvm_close(kvm);
return 0;
}
kvm_read(kvm, nl[0].n_value, &ifh, sizeof(struct ifnet_head));
ifp = TAILQ_FIRST(&ifh);
while (ifp) {
struct ifnet ifnet;
kvm_read(kvm, (u_long)ifp, &ifnet, sizeof(struct ifnet));
if (!strcmp(ifnet.if_xname, BPF_IFNAME)) {
ifap = IFADDR_FIRST(&ifnet);
break;
}
ifp = IFNET_NEXT(&ifnet);
}
if (!ifp) {
warnx("interface not found");
kvm_close(kvm);
return 0;
}
#define _offsetof(t, m) ((int)((void *)&((t *)0)->m))
sdllen = _offsetof(struct sockaddr_dl,
sdl_data[0]) + strlen(BPF_IFNAME) + 6;
sdlp = malloc(sdllen);
while (ifap) {
struct ifaddr ifaddr;
kvm_read(kvm, (u_long)ifap, &ifaddr, sizeof(struct ifaddr));
kvm_read(kvm, (u_long)ifaddr.ifa_addr, sdlp, sdllen);
if (sdlp->sdl_family == AF_LINK) {
memcpy(ha, CLLADDR(sdlp), 6);
break;
}
ifap = IFADDR_NEXT(&ifaddr);
}
free(sdlp);
kvm_close(kvm);
if (!ifap) {
warnx("interface hw addr not found");
return 0;
}
return 1;
}
void
EtherStop(void)
{
if (bpf != -1)
close(bpf);
}
int
EtherSend(char *pkt, int len)
{
if (write(bpf, pkt, len) != len) {
warn("EtherSend");
return -1;
}
return len;
}
static union {
struct bpf_hdr h;
u_char buf[MAXPKT];
} rbuf;
int
EtherReceive(char *pkt, int maxlen)
{
int res;
res = read(bpf, &rbuf, MAXPKT);
if (res > 0) {
#if 0
int i;
fprintf(stderr, "got packet, len=%d\n", rbuf.h.bh_caplen);
if (rbuf.h.bh_caplen < rbuf.h.bh_datalen)
printf("(truncated)\n");
for (i = 0; i < 20; i++)
fprintf(stderr, "%02x ", rbuf.buf[rbuf.h.bh_hdrlen + i]);
fprintf(stderr, "\n");
#endif
if (rbuf.h.bh_caplen > maxlen)
return 0;
memcpy(pkt, &rbuf.buf[rbuf.h.bh_hdrlen], rbuf.h.bh_caplen);
return rbuf.h.bh_caplen;
}
return 0;
}