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/*
* libpacketdump decoder for Radiotap
*/
#include "libtrace_int.h" /* bswaps */
#include <sys/types.h>
#include <netinet/in.h>
#include <stdio.h>
#include <inttypes.h>
#include <dlfcn.h>
#include "libtrace.h"
#include "libpacketdump.h"
#define ALIGN_NATURAL_32(_p,_s,_c) \
while ( (_p - _s) % sizeof(uint32_t)) {_p++; _c++;}
#define ALIGN_NATURAL_16(_p,_s,_c) \
while ( (_p - _s) % sizeof(uint16_t)) {_p++; _c++;}
DLLEXPORT void decode(int link_type UNUSED,const char *packet,unsigned len)
{
uint32_t *ptr;
uint8_t *p; /* Our current field "cursor" */
uint8_t *s; /* Start of data fields, for alignment */
struct libtrace_radiotap_t *rtap;
uint16_t rtap_len;
uint16_t rtap_real_len; /* to make sure length in header matches fields present */
rtap = (libtrace_radiotap_t *)packet;
printf(" Radiotap:");
if (len < 8) {
printf(" [|Truncated (%u bytes)]\n", len);
return;
}
rtap_real_len = sizeof(struct libtrace_radiotap_t);
rtap_len = bswap_le_to_host16(rtap->it_len);
printf(" version: %u, length: %u, fields: %#08x\n", rtap->it_version,
rtap_len, rtap->it_present);
/* Check for extended bitmasks */
ptr = (uint32_t *) &(rtap->it_present);
if ( (*ptr) & (1 << TRACE_RADIOTAP_EXT) )
printf(" extended fields:");
while( (*ptr) & (1 << TRACE_RADIOTAP_EXT) ) {
rtap_real_len += sizeof (uint32_t);
printf(" %#08x", *(++ptr));
}
/* make p point to the first data field */
s = p = (uint8_t *) ++ptr;
if (rtap->it_present & (1 << TRACE_RADIOTAP_TSFT)) {
printf(" Radiotap: TSFT = %" PRIu64 " microseconds\n", bswap_le_to_host64(*((uint64_t *)p)));
p += sizeof (uint64_t);
rtap_real_len += sizeof (uint64_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_FLAGS)) {
printf(" Radiotap: Flags = 0x%02x\n", *p);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_RATE)) {
printf(" Radiotap: Rate = %u kbps\n", (*p) * 500);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_CHANNEL)) {
ALIGN_NATURAL_16(p,s,rtap_real_len);
printf(" Radiotap: Freq = %u MHz, ChanFlags: 0x%04x\n", bswap_le_to_host16(*((uint16_t *)p)),
*(((uint16_t *)p) + 1));
p += sizeof (uint32_t);
rtap_real_len += sizeof(uint32_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_FHSS)) {
ALIGN_NATURAL_16(p,s, rtap_real_len);
printf(" Radiotap: FHSS HopSet = %u , HopPattern: %u\n", *p, *(p+1));
p += sizeof (uint16_t);
rtap_real_len += sizeof(uint16_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_DBM_ANTSIGNAL)) {
printf(" Radiotap: Signal = %i dBm\n", (int8_t) *p) ;
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_DBM_ANTNOISE)) {
printf(" Radiotap: Noise = %i dBm\n", (int8_t) *p);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_LOCK_QUALITY)) {
ALIGN_NATURAL_16(p,s, rtap_real_len);
printf(" Radiotap: Barker Code Lock Quality = %u\n", bswap_le_to_host16(*((uint16_t *)p)));
p += sizeof (uint16_t);
rtap_real_len += sizeof(uint16_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_TX_ATTENUATION)) {
ALIGN_NATURAL_16(p,s, rtap_real_len);
printf(" Radiotap: TX Attenuation = %u\n", bswap_le_to_host16(*((uint16_t *)p)));
p += sizeof (uint16_t);
rtap_real_len += sizeof(uint16_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_DB_TX_ATTENUATION)) {
ALIGN_NATURAL_16(p,s,rtap_real_len);
printf(" Radiotap: TX Attenuation = %u dB\n", bswap_le_to_host16(*((uint16_t *)p)));
p += sizeof (uint16_t);
rtap_real_len += sizeof(uint16_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_DBM_TX_POWER)) {
printf(" Radiotap: TX Power = %i dBm\n", *p);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_ANTENNA)) {
printf(" Radiotap: Antenna = %u\n", *p);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_DB_ANTSIGNAL)) {
printf(" Radiotap: Signal = %u dB\n", *p);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_DB_ANTNOISE)) {
printf(" Radiotap: Noise = %u dB\n", *p);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_RX_FLAGS)) {
ALIGN_NATURAL_16(p,s,rtap_real_len);
printf(" Radiotap: RX Flags = 0x%04x\n", *((uint16_t *)p));
p += sizeof (uint16_t);
rtap_real_len += sizeof(uint16_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_TX_FLAGS)) {
ALIGN_NATURAL_16(p,s,rtap_real_len);
printf(" Radiotap: TX Flags = 0x%04x\n", *((uint16_t *)p));
p += sizeof (uint16_t);
rtap_real_len += sizeof(uint16_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_RTS_RETRIES)) {
printf(" Radiotap: RTS Retries = %u\n", *p);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap->it_present & (1 << TRACE_RADIOTAP_DATA_RETRIES)) {
printf(" Radiotap: Data Retries = %u\n", *p);
p += sizeof (uint8_t);
rtap_real_len += sizeof(uint8_t);
}
if (rtap_real_len != rtap_len)
printf(" Radiotap: WARNING: Header contains un-decoded fields.\n");
if (len > rtap_len)
decode_next(packet + rtap_len, len - rtap_len, "link", TRACE_TYPE_80211);
return;
}
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