int
mlvpn_tuntap_write(struct tuntap_s *tuntap)
{
ssize_t ret;
mlvpn_pkt_t *pkt;
circular_buffer_t *buf = tuntap->sbuf;
/* Safety checks */
if (mlvpn_cb_is_empty(buf))
fatalx("tuntap_write called with empty buffer");
pkt = mlvpn_pktbuffer_read(buf);
ret = write(tuntap->fd, pkt->data, pkt->len);
if (ret < 0)
{
log_warn("tuntap", "%s write error", tuntap->devname);
} else {
if (ret != pkt->len)
{
log_warnx("tuntap", "%s write error: %zd/%d bytes sent",
tuntap->devname, ret, pkt->len);
} else {
log_debug("tuntap", "%s > sent %zd bytes",
tuntap->devname, ret);
}
}
return ret;
}
int
mlvpn_tuntap_write(struct tuntap_s *tuntap)
{
int len, datalen;
mlvpn_pkt_t *pkt;
circular_buffer_t *buf = tuntap->sbuf;
uint32_t type;
struct iovec iov[2];
/* Safety checks */
if (mlvpn_cb_is_empty(buf))
{
_FATAL("[tuntap %s] tuntap_write called with empty buffer!\n",
tuntap->devname);
return -1;
}
pkt = mlvpn_pktbuffer_read(buf);
type = htonl(AF_INET);
iov[0].iov_base = &type;
iov[0].iov_len = sizeof(type);
iov[1].iov_base = pkt->pktdata.data;
iov[1].iov_len = pkt->pktdata.len;
len = writev(tuntap->fd, iov, 2);
datalen = len - iov[0].iov_len;
if (len < 0)
{
_ERROR("[tuntap %s] write error: %s\n",
tuntap->devname, strerror(errno));
} else {
if (datalen != pkt->pktdata.len)
{
_ERROR("[tuntap %s] write error: only %d/%d bytes sent.\n",
tuntap->devname, datalen, pkt->pktdata.len);
} else {
_DEBUG("[tuntap %s] >> wrote %d bytes.\n",
tuntap->devname, datalen);
}
}
return datalen;
}
