DigitalInfinity/ESP32-PaxCounter
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

macsniff.cpp code sanitization

Browse Source
This commit is contained in:
cyberman54 2020-12-29 20:48:02 +01:00
parent df8083dba6
commit 0209915877
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/macsniff.cpp
View File

@ -102,6 +102,10 @@ void IRAM_ATTR mac_add(uint8_t *paddr, int8_t rssi, snifftype_t sniff_type) {
uint16_t mac_analyze(MacBuffer_t MacBuffer) {
uint32_t *mac; // pointer to shortened 4 byte MAC
uint32_t saltedmac;
uint16_t hashedmac;
if ((cfg.rssilimit) &&
(MacBuffer.rssi < cfg.rssilimit)) { // rssi is negative value
ESP_LOGI(TAG, "%s RSSI %d -> ignoring (limit: %d)",
@ -124,8 +128,6 @@ uint16_t mac_analyze(MacBuffer_t MacBuffer) {
}
};
uint32_t *mac; // pointer to shortened 4 byte 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.
// this gets MAC in msb (= reverse) order, but doesn't matter for hashing it.
@ -136,12 +138,12 @@ uint16_t mac_analyze(MacBuffer_t MacBuffer) {
// https://en.wikipedia.org/wiki/MAC_Address_Anonymization
// reversed 4 byte MAC added to current salt
const uint32_t saltedmac = *mac + salt;
saltedmac = *mac + salt;
// hashed 4 byte MAC
// to save RAM, we use only lower 2 bytes of hash, since collisions don't
// matter in our use case
const uint16_t hashedmac = hash((const char *)&saltedmac, 4);
hashedmac = hash((const char *)&saltedmac, 4);
auto newmac = macs.insert(hashedmac); // add hashed MAC, if new unique
bool added =