static VALUE lorcon_device_set_channel(VALUE self, VALUE channel) {
struct rldev *rld;
Data_Get_Struct(self, struct rldev, rld);
tx80211_setchannel(&rld->in_tx, NUM2INT(channel));
return INT2NUM(tx80211_getchannel(&rld->in_tx));
}
int airpcap_send(struct tx80211 *in_tx, struct tx80211_packet *in_pkt)
{
struct airpcap_data *apcap = in_tx->extra;
struct tx80211_radiotap_header *rtaphdr;
PCHAR pkt;
int channel;
ULONG len;
len = (in_pkt->plen + TX80211_RTAP_LEN);
pkt = malloc(len);
if (pkt == NULL) {
snprintf(in_tx->errstr, TX80211_STATUS_MAX,
"Unable to allocate memory buffer "
"for send function");
return TX80211_ENOMEM;
}
memset(pkt, 0, len);
channel = tx80211_getchannel(in_tx);
/* Setup radiotap header */
rtaphdr = (struct tx80211_radiotap_header *)pkt;
rtaphdr->it_version = 0;
rtaphdr->it_pad = 0;
rtaphdr->it_len = tx80211_le16(TX80211_RTAP_LEN);
rtaphdr->it_present = tx80211_le32(TX80211_RTAP_PRESENT);
rtaphdr->wr_flags = 0;
if (in_pkt->txrate == 0) {
/* Airpcap can't handle a rate of 0, set to 2 Mbps as default */
rtaphdr->wr_rate = TX80211_RATE_2MB;
} else {
rtaphdr->wr_rate = in_pkt->txrate;
}
rtaphdr->wr_chan_freq = tx80211_chan2mhz(channel);
switch(in_pkt->modulation) {
case TX80211_MOD_DEFAULT:
rtaphdr->wr_chan_flags = 0;
break;
case TX80211_MOD_DSSS:
rtaphdr->wr_chan_flags =
tx80211_le16(TX80211_RTAP_CHAN_B);
break;
case TX80211_MOD_OFDM:
/* OFDM can be 802.11g or 802.11a */
if (channel <= 14) {
/* 802.11g network */
rtaphdr->wr_chan_flags =
tx80211_le16(TX80211_RTAP_CHAN_G);
} else {
rtaphdr->wr_chan_flags =
tx80211_le16(TX80211_RTAP_CHAN_A);
}
break;
case TX80211_MOD_TURBO:
/* Turbo can be 802.11g or 802.11a */
if (channel <= 14) {
/* 802.11g network */
rtaphdr->wr_chan_flags =
tx80211_le16(TX80211_RTAP_CHAN_TG);
} else {
rtaphdr->wr_chan_flags =
tx80211_le16(TX80211_RTAP_CHAN_TA);
}
break;
default:
snprintf(in_tx->errstr, TX80211_STATUS_MAX,
"Unsupported modulation mechanism "
"specified in send function.");
return TX80211_ENOTSUPP;
}
memcpy(pkt + TX80211_RTAP_LEN, in_pkt->packet, in_pkt->plen);
if (AirpcapWrite(apcap->ad, pkt, len) != 1) {
free(pkt);
snprintf(in_tx->errstr, TX80211_STATUS_MAX,
"Error sending packet: %s",
AirpcapGetLastError(apcap->ad));
return TX80211_ETXFAILED;
}
free(pkt);
return (len - TX80211_RTAP_LEN);
}