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/*
* tun-bsd.c
*
* Copyright (c) 2001 Dug Song <dugsong@monkey.org>
*
* $Id: tun-bsd.c 573 2005-02-10 23:50:04Z dugsong $
*/
#include "config.h"
#include <sys/socket.h>
#include <sys/uio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dnet.h"
struct tun {
int fd;
intf_t *intf;
struct intf_entry save;
};
#define MAX_DEVS 16 /* XXX - max number of tunnel devices */
tun_t *
tun_open(struct addr *src, struct addr *dst, int mtu)
{
struct intf_entry ifent;
tun_t *tun;
char dev[128];
int i;
if (src->addr_type != ADDR_TYPE_IP || dst->addr_type != ADDR_TYPE_IP ||
src->addr_bits != IP_ADDR_BITS || dst->addr_bits != IP_ADDR_BITS) {
errno = EINVAL;
return (NULL);
}
if ((tun = calloc(1, sizeof(*tun))) == NULL)
return (NULL);
if ((tun->intf = intf_open()) == NULL)
return (tun_close(tun));
memset(&ifent, 0, sizeof(ifent));
ifent.intf_len = sizeof(ifent);
for (i = 0; i < MAX_DEVS; i++) {
snprintf(dev, sizeof(dev), "/dev/tun%d", i);
strlcpy(ifent.intf_name, dev + 5, sizeof(ifent.intf_name));
tun->save = ifent;
if ((tun->fd = open(dev, O_RDWR, 0)) != -1 &&
intf_get(tun->intf, &tun->save) == 0) {
route_t *r;
struct route_entry entry;
ifent.intf_flags = INTF_FLAG_UP|INTF_FLAG_POINTOPOINT;
ifent.intf_addr = *src;
ifent.intf_dst_addr = *dst;
ifent.intf_mtu = mtu;
if (intf_set(tun->intf, &ifent) < 0)
tun = tun_close(tun);
/* XXX - try to ensure our route got set */
if ((r = route_open()) != NULL) {
entry.route_dst = *dst;
entry.route_gw = *src;
route_add(r, &entry);
route_close(r);
}
break;
}
}
if (i == MAX_DEVS)
tun = tun_close(tun);
return (tun);
}
const char *
tun_name(tun_t *tun)
{
return (tun->save.intf_name);
}
int
tun_fileno(tun_t *tun)
{
return (tun->fd);
}
ssize_t
tun_send(tun_t *tun, const void *buf, size_t size)
{
#ifdef __OpenBSD__
struct iovec iov[2];
uint32_t af = htonl(AF_INET);
iov[0].iov_base = ⁡
iov[0].iov_len = sizeof(af);
iov[1].iov_base = (void *)buf;
iov[1].iov_len = size;
return (writev(tun->fd, iov, 2));
#else
return (write(tun->fd, buf, size));
#endif
}
ssize_t
tun_recv(tun_t *tun, void *buf, size_t size)
{
#ifdef __OpenBSD__
struct iovec iov[2];
uint32_t af;
iov[0].iov_base = ⁡
iov[0].iov_len = sizeof(af);
iov[1].iov_base = (void *)buf;
iov[1].iov_len = size;
return (readv(tun->fd, iov, 2) - sizeof(af));
#else
return (read(tun->fd, buf, size));
#endif
}
tun_t *
tun_close(tun_t *tun)
{
if (tun->fd > 0)
close(tun->fd);
if (tun->intf != NULL) {
/* Restore interface configuration on close. */
intf_set(tun->intf, &tun->save);
intf_close(tun->intf);
}
free(tun);
return (NULL);
}
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