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macsniff.cpp: efficiency optimization

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This commit is contained in:
Verkehrsrot 2019-07-21 19:20:02 +02:00
parent 8826a26c7a
commit bb7b8b90f8
1 changed files with 25 additions and 23 deletions
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38
src/macsniff.cpp
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@ -37,33 +37,35 @@ void printKey(const char *name, const uint8_t *key, uint8_t len, bool lsb) {
}
uint64_t macConvert(uint8_t *paddr) {
return ((uint64_t)paddr[0]) | ((uint64_t)paddr[1] << 8) |
((uint64_t)paddr[2] << 16) | ((uint64_t)paddr[3] << 24) |
((uint64_t)paddr[4] << 32) | ((uint64_t)paddr[5] << 40);
uint64_t *mac;
mac = (uint64_t *)paddr;
return (__builtin_bswap32(*mac) >> 8);
}
bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
char buff[16]; // temporary buffer for printf
if (!salt) // ensure we have salt (appears after radio is turned on)
return false;
char buff[10]; // temporary buffer for printf
bool added = false;
int8_t beaconID; // beacon number in test monitor mode
uint16_t hashedmac; // temporary buffer for generated hash value
uint32_t addr2int; // temporary buffer for shortened MAC
#if(VENDORFILTER)
uint32_t vendor2int; // temporary buffer for Vendor OUI
#endif
uint32_t *mac; // temporary buffer for shortened MAC
// only last 3 MAC Address bytes are used for MAC address anonymization
// but since it's uint32 we take 4 bytes to avoid 1st value to be 0
addr2int = ((uint32_t)paddr[2]) | ((uint32_t)paddr[3] << 8) |
((uint32_t)paddr[4] << 16) | ((uint32_t)paddr[5] << 24);
// but since it's uint32 we take 4 bytes to avoid 1st value to be 0.
// this gets MAC in msb (= reverse) order, but doesn't matter for hashing it.
mac = (uint32_t *)(paddr + 2);
#if (VENDORFILTER)
vendor2int = ((uint32_t)paddr[2]) | ((uint32_t)paddr[1] << 8) |
((uint32_t)paddr[0] << 16);
uint32_t *oui; // temporary buffer for vendor OUI
oui = (uint32_t *)paddr;
// use OUI vendor filter list only on Wifi, not on BLE
if ((sniff_type == MAC_SNIFF_BLE) ||
std::find(vendors.begin(), vendors.end(), vendor2int) != vendors.end()) {
std::find(vendors.begin(), vendors.end(), __builtin_bswap32(*oui) >> 8) !=
vendors.end()) {
#endif
// salt and hash MAC, and if new unique one, store identifier in container
@ -71,10 +73,9 @@ bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
// https://en.wikipedia.org/wiki/MAC_Address_Anonymization
snprintf(buff, sizeof(buff), "%08X",
addr2int + (uint32_t)salt); // convert usigned 32-bit salted MAC
*mac + (uint32_t)salt); // convert unsigned 32-bit salted MAC
// to 8 digit hex string
hashedmac = rokkit(&buff[3], 5); // hash MAC last string value, use 5 chars
// to fit hash in uint16_t container
hashedmac = rokkit(&buff[3], 5); // hash MAC 8 digit -> 5 digit
auto newmac = macs.insert(hashedmac); // add hashed MAC, if new unique
added = newmac.second ? true
: false; // true if hashed MAC is unique in container
@ -115,7 +116,8 @@ bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
// Log scan result
ESP_LOGV(TAG,
"%s %s RSSI %ddBi -> MAC %s -> Hash %04X -> WiFi:%d BLTH:%d -> "
"%s %s RSSI %ddBi -> salted MAC %s -> Hash %04X -> WiFi:%d "
"BLTH:%d -> "
"%d Bytes left",
added ? "new " : "known",
sniff_type == MAC_SNIFF_WIFI ? "WiFi" : "BLTH", rssi, buff,