static void
list_channels(const char *ifname, int allchans)
{
struct ieee80211req_chaninfo chans;
struct ieee80211req_chaninfo achans;
const struct ieee80211_channel *c;
int i, half;
if (get80211priv(ifname, IEEE80211_IOCTL_GETCHANINFO, &chans, sizeof(chans)) < 0)
errx(1, "unable to get channel information");
if (!allchans) {
uint8_t active[32];
if (get80211priv(ifname, IEEE80211_IOCTL_GETCHANLIST, &active, sizeof(active)) < 0)
errx(1, "unable to get active channel list");
memset(&achans, 0, sizeof(achans));
for (i = 0; i < chans.ic_nchans; i++) {
c = &chans.ic_chans[i];
if (isset(active, ieee80211_mhz2ieee(c->ic_freq)) || allchans)
achans.ic_chans[achans.ic_nchans++] = *c;
}
} else
achans = chans;
half = achans.ic_nchans / 2;
if (achans.ic_nchans % 2)
half++;
for (i = 0; i < achans.ic_nchans / 2; i++) {
print_chaninfo(&achans.ic_chans[i]);
print_chaninfo(&achans.ic_chans[half + i]);
printf("\n");
}
if (achans.ic_nchans % 2) {
print_chaninfo(&achans.ic_chans[i]);
printf("\n");
}
}
static int
print_radiotap_field(struct cpack_state *s, u_int32_t bit, u_int8_t *flags)
{
union {
int8_t i8;
u_int8_t u8;
int16_t i16;
u_int16_t u16;
u_int32_t u32;
u_int64_t u64;
} u, u2, u3, u4;
int rc;
switch (bit) {
case IEEE80211_RADIOTAP_FLAGS:
rc = cpack_uint8(s, &u.u8);
*flags = u.u8;
break;
case IEEE80211_RADIOTAP_RATE:
case IEEE80211_RADIOTAP_DB_ANTSIGNAL:
case IEEE80211_RADIOTAP_DB_ANTNOISE:
case IEEE80211_RADIOTAP_ANTENNA:
rc = cpack_uint8(s, &u.u8);
break;
case IEEE80211_RADIOTAP_DBM_ANTSIGNAL:
case IEEE80211_RADIOTAP_DBM_ANTNOISE:
rc = cpack_int8(s, &u.i8);
break;
case IEEE80211_RADIOTAP_CHANNEL:
rc = cpack_uint16(s, &u.u16);
if (rc != 0)
break;
rc = cpack_uint16(s, &u2.u16);
break;
case IEEE80211_RADIOTAP_FHSS:
case IEEE80211_RADIOTAP_LOCK_QUALITY:
case IEEE80211_RADIOTAP_TX_ATTENUATION:
rc = cpack_uint16(s, &u.u16);
break;
case IEEE80211_RADIOTAP_DB_TX_ATTENUATION:
rc = cpack_uint8(s, &u.u8);
break;
case IEEE80211_RADIOTAP_DBM_TX_POWER:
rc = cpack_int8(s, &u.i8);
break;
case IEEE80211_RADIOTAP_TSFT:
rc = cpack_uint64(s, &u.u64);
break;
case IEEE80211_RADIOTAP_XCHANNEL:
rc = cpack_uint32(s, &u.u32);
if (rc != 0)
break;
rc = cpack_uint16(s, &u2.u16);
if (rc != 0)
break;
rc = cpack_uint8(s, &u3.u8);
if (rc != 0)
break;
rc = cpack_uint8(s, &u4.u8);
break;
default:
/* this bit indicates a field whose
* size we do not know, so we cannot
* proceed. Just print the bit number.
*/
printf("[bit %u] ", bit);
return -1;
}
if (rc != 0) {
printf("[|802.11]");
return rc;
}
switch (bit) {
case IEEE80211_RADIOTAP_CHANNEL:
print_chaninfo(u.u16, u2.u16);
break;
case IEEE80211_RADIOTAP_FHSS:
printf("fhset %d fhpat %d ", u.u16 & 0xff, (u.u16 >> 8) & 0xff);
break;
case IEEE80211_RADIOTAP_RATE:
if (u.u8 & 0x80)
PRINT_HT_RATE("", u.u8, " Mb/s ");
else
PRINT_RATE("", u.u8, " Mb/s ");
break;
case IEEE80211_RADIOTAP_DBM_ANTSIGNAL:
printf("%ddB signal ", u.i8);
break;
case IEEE80211_RADIOTAP_DBM_ANTNOISE:
printf("%ddB noise ", u.i8);
break;
case IEEE80211_RADIOTAP_DB_ANTSIGNAL:
printf("%ddB signal ", u.u8);
break;
case IEEE80211_RADIOTAP_DB_ANTNOISE:
printf("%ddB noise ", u.u8);
break;
case IEEE80211_RADIOTAP_LOCK_QUALITY:
printf("%u sq ", u.u16);
break;
case IEEE80211_RADIOTAP_TX_ATTENUATION:
printf("%d tx power ", -(int)u.u16);
break;
case IEEE80211_RADIOTAP_DB_TX_ATTENUATION:
printf("%ddB tx power ", -(int)u.u8);
break;
case IEEE80211_RADIOTAP_DBM_TX_POWER:
printf("%ddBm tx power ", u.i8);
break;
case IEEE80211_RADIOTAP_FLAGS:
if (u.u8 & IEEE80211_RADIOTAP_F_CFP)
printf("cfp ");
if (u.u8 & IEEE80211_RADIOTAP_F_SHORTPRE)
printf("short preamble ");
if (u.u8 & IEEE80211_RADIOTAP_F_WEP)
printf("wep ");
if (u.u8 & IEEE80211_RADIOTAP_F_FRAG)
printf("fragmented ");
if (u.u8 & IEEE80211_RADIOTAP_F_BADFCS)
printf("bad-fcs ");
break;
case IEEE80211_RADIOTAP_ANTENNA:
printf("antenna %d ", u.u8);
break;
case IEEE80211_RADIOTAP_TSFT:
printf("%" PRIu64 "us tsft ", u.u64);
break;
case IEEE80211_RADIOTAP_XCHANNEL:
print_chaninfo(u2.u16, u.u32);
break;
}
return 0;
}
