DigitalInfinity/ESP32-PaxCounter
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salt bugfix

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This commit is contained in:
Klaus K Wilting 2018-04-01 22:14:51 +02:00
parent 4b9beff3bd
commit 70d7b4f719
1 changed files with 10 additions and 9 deletions
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19
src/wifisniffer.cpp
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@ -60,7 +60,7 @@ void wifi_sniffer_packet_handler(void* buff, wifi_promiscuous_pkt_type_t type) {
const wifi_ieee80211_packet_t *ipkt = (wifi_ieee80211_packet_t *)ppkt->payload;
const wifi_ieee80211_mac_hdr_t *hdr = &ipkt->hdr;
char counter [6]; // uint16_t -> 2 byte -> 5 decimals + '0' terminator -> 6 chars
char macbuf [21]; // uint64_t -> 8 byte -> 20 decimals + '0' terminator -> 21 chars
char macbuf [21]; // uint64_t -> 8 byte -> 10 decimals + '0' terminator -> 21 chars
uint64_t addr2int;
uint32_t vendor2int;
uint16_t hashedmac;
@ -77,14 +77,15 @@ void wifi_sniffer_packet_handler(void* buff, wifi_promiscuous_pkt_type_t type) {
// salt and hash MAC, and if new unique one, store identifier in container and increment counter on display
// https://en.wikipedia.org/wiki/MAC_Address_Anonymization
addr2int |= (uint64_t) salt << 48; // prepend 12 bit salt to 48 bit MAC
itoa(addr2int, macbuf, 10); // convert 64 bit MAC to base 10 decimal string
hashedmac = rokkit(macbuf, 5); // hash MAC, use 5 chars to fit hash in uint16_t container
newmac = macs.insert(hashedmac); // store hashed MAC if new unique
if (newmac.second) { // first time seen MAC
macnum++; // increment MAC counter
itoa(macnum, counter, 10); // base 10 decimal counter value
u8x8.draw2x2String(0, 0, counter);
addr2int |= (uint64_t) salt << 48; // prepend 16-bit salt to 48-bit MAC
snprintf(macbuf, 21, "%llx", addr2int); // convert unsigned 64-bit salted MAC to 16 digit hex string
hashedmac = rokkit(macbuf, 5); // hash MAC, use 5 chars to fit hash in uint16_t container
newmac = macs.insert(hashedmac); // store hashed MAC if new unique
if (newmac.second) { // first time seen MAC
macnum++; // increment MAC counter
snprintf(counter, 6, "%i", macnum); // convert 16-bit MAC counter to decimal counter value
u8x8.draw2x2String(0, 0, counter); // display counter
ESP_LOGI(TAG, "addr2int: %016llx macbuf: %s", addr2int, macbuf);
ESP_LOGI(TAG, "#%05i: RSSI %04d -> Salt %04x -> Hash %04x", macnum, ppkt->rx_ctrl.rssi, salt, hashedmac);
}