mirror of
https://github.com/meshcore-dev/MeshCore.git
synced 2026-03-30 21:25:46 +00:00
316 lines
10 KiB
C++
316 lines
10 KiB
C++
#include <Arduino.h> // needed for PlatformIO
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#include <Mesh.h>
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#include <SPIFFS.h>
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#define RADIOLIB_STATIC_ONLY 1
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#include <RadioLib.h>
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#include <helpers/CustomSX1262Wrapper.h>
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#include <helpers/ArduinoHelpers.h>
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#include <helpers/SimpleMeshTables.h>
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#include <helpers/StaticPoolPacketManager.h>
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/* ---------------------------------- CONFIGURATION ------------------------------------- */
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#ifndef LORA_FREQ
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#define LORA_FREQ 915.0
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#endif
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#ifndef LORA_BW
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#define LORA_BW 125
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#endif
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#ifndef LORA_SF
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#define LORA_SF 9
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#endif
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#ifndef LORA_CR
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#define LORA_CR 5
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#endif
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#define ADMIN_PASSWORD "h^(kl@#)"
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#ifdef HELTEC_LORA_V3
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#include <helpers/HeltecV3Board.h>
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static HeltecV3Board board;
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#else
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#error "need to provide a 'board' object"
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#endif
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/* -------------------------------------------------------------------------------------- */
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#define MAX_TEXT_LEN (10*CIPHER_BLOCK_SIZE) // must be LESS than (MAX_PACKET_PAYLOAD - FROM_HASH_LEN - CIPHER_MAC_SIZE - 1)
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#define CMD_GET_STATS 0x01
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#define CMD_SET_CLOCK 0x02
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#define CMD_SEND_ANNOUNCE 0x03
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#define CMD_SET_CONFIG 0x04
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struct RepeaterStats {
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uint16_t batt_milli_volts;
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uint16_t curr_tx_queue_len;
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uint16_t curr_free_queue_len;
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int16_t last_rssi;
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uint32_t n_packets_recv;
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uint32_t n_packets_sent;
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uint32_t total_air_time_secs;
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uint32_t total_up_time_secs;
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uint32_t n_sent_flood, n_sent_direct;
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uint32_t n_recv_flood, n_recv_direct;
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uint32_t n_full_events;
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};
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class MyMesh : public mesh::Mesh {
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uint32_t last_advert_timestamp = 0;
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mesh::Identity server_id;
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uint8_t server_secret[PUB_KEY_SIZE];
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int server_path_len = -1;
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uint8_t server_path[MAX_PATH_SIZE];
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bool got_adv = false;
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protected:
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void onAdvertRecv(mesh::Packet* packet, const mesh::Identity& id, uint32_t timestamp, const uint8_t* app_data, size_t app_data_len) override {
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if (memcmp(app_data, "repeater:", 9) == 0) {
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Serial.println("Received advertisement from a repeater!");
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// check for replay attacks
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if (timestamp > last_advert_timestamp) {
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last_advert_timestamp = timestamp;
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server_id = id;
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self_id.calcSharedSecret(server_secret, id); // calc ECDH shared secret
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got_adv = true;
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// 'login' to repeater. (mainly lets it know our public key)
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uint32_t now = getRTCClock()->getCurrentTime(); // important, need timestamp in packet, so that packet_hash will be unique
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uint8_t temp[4 + 8];
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memcpy(temp, &now, 4);
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memcpy(&temp[4], ADMIN_PASSWORD, 8);
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mesh::Packet* login = createAnonDatagram(PAYLOAD_TYPE_ANON_REQ, self_id, server_id, server_secret, temp, sizeof(temp));
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if (login) sendFlood(login); // server_path won't be known yet
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}
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}
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}
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void handleResponse(const uint8_t* reply, size_t reply_len) {
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if (reply_len >= 4 + sizeof(RepeaterStats)) { // got an GET_STATS reply from repeater
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RepeaterStats stats;
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memcpy(&stats, &reply[4], sizeof(stats));
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Serial.println("Repeater Stats:");
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Serial.printf(" battery: %d mV\n", (uint32_t) stats.batt_milli_volts);
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Serial.printf(" tx queue: %d\n", (uint32_t) stats.curr_tx_queue_len);
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Serial.printf(" free queue: %d\n", (uint32_t) stats.curr_free_queue_len);
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Serial.printf(" last RSSI: %d\n", (int) stats.last_rssi);
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Serial.printf(" num recv: %d\n", stats.n_packets_recv);
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Serial.printf(" num sent: %d\n", stats.n_packets_sent);
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Serial.printf(" air time (secs): %d\n", stats.total_air_time_secs);
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Serial.printf(" up time (secs): %d\n", stats.total_up_time_secs);
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} else if (reply_len > 4) { // got an SET_* reply from repeater
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char tmp[MAX_PACKET_PAYLOAD];
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memcpy(tmp, &reply[4], reply_len - 4);
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tmp[reply_len - 4] = 0; // make a C string of reply
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Serial.print("Reply: "); Serial.println(tmp);
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}
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}
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int searchPeersByHash(const uint8_t* hash) override {
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if (got_adv && server_id.isHashMatch(hash)) {
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return 1;
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}
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return 0; // not found
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}
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void getPeerSharedSecret(uint8_t* dest_secret, int peer_idx) override {
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// lookup pre-calculated shared_secret
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memcpy(dest_secret, server_secret, PUB_KEY_SIZE);
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}
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void onPeerDataRecv(mesh::Packet* packet, uint8_t type, int sender_idx, const uint8_t* secret, uint8_t* data, size_t len) override {
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if (type == PAYLOAD_TYPE_RESPONSE) {
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handleResponse(data, len);
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if (packet->isRouteFlood()) {
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// let server know path TO here, so they can use sendDirect() for future ping responses
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mesh::Packet* path = createPathReturn(server_id, secret, packet->path, packet->path_len, 0, NULL, 0);
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if (path) sendFlood(path);
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}
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}
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}
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bool onPeerPathRecv(mesh::Packet* packet, int sender_idx, const uint8_t* secret, uint8_t* path, uint8_t path_len, uint8_t extra_type, uint8_t* extra, uint8_t extra_len) override {
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// must be from server_id
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Serial.printf("PATH to repeater, path_len=%d\n", (uint32_t) path_len);
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memcpy(server_path, path, server_path_len = path_len); // store a copy of path, for sendDirect()
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if (extra_type == PAYLOAD_TYPE_RESPONSE) {
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handleResponse(extra, extra_len);
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}
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return true; // send reciprocal path if necessary
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}
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public:
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MyMesh(mesh::Radio& radio, mesh::RNG& rng, mesh::RTCClock& rtc, mesh::MeshTables& tables)
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: mesh::Mesh(radio, *new ArduinoMillis(), rng, rtc, *new StaticPoolPacketManager(16), tables)
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{
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}
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mesh::Packet* createStatsRequest(uint32_t max_age) {
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uint8_t payload[9];
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uint32_t now = getRTCClock()->getCurrentTime();
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memcpy(payload, &now, 4);
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payload[4] = CMD_GET_STATS;
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memcpy(&payload[5], &max_age, 4);
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return createDatagram(PAYLOAD_TYPE_REQ, server_id, server_secret, payload, sizeof(payload));
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}
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mesh::Packet* createSetClockRequest(uint32_t timestamp) {
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uint8_t payload[9];
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uint32_t now = getRTCClock()->getCurrentTime();
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memcpy(payload, &now, 4);
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payload[4] = CMD_SET_CLOCK;
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memcpy(&payload[5], &now, 4); // repeated :-(
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return createDatagram(PAYLOAD_TYPE_REQ, server_id, server_secret, payload, sizeof(payload));
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}
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mesh::Packet* createSetAirtimeFactorRequest(float airtime_factor) {
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uint8_t payload[16];
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uint32_t now = getRTCClock()->getCurrentTime();
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memcpy(payload, &now, 4);
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payload[4] = CMD_SET_CONFIG;
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sprintf((char *) &payload[5], "AF%f", airtime_factor);
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return createDatagram(PAYLOAD_TYPE_REQ, server_id, server_secret, payload, sizeof(payload));
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}
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mesh::Packet* createAnnounceRequest() {
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uint8_t payload[5];
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uint32_t now = getRTCClock()->getCurrentTime();
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memcpy(payload, &now, 4);
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payload[4] = CMD_SEND_ANNOUNCE;
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return createDatagram(PAYLOAD_TYPE_REQ, server_id, server_secret, payload, sizeof(payload));
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}
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mesh::Packet* parseCommand(char* command) {
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if (strcmp(command, "stats") == 0) {
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return createStatsRequest(60*60); // max_age = one hour
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} else if (memcmp(command, "setclock ", 9) == 0) {
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uint32_t timestamp = atol(&command[9]);
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return createSetClockRequest(timestamp);
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} else if (memcmp(command, "set AF=", 7) == 0) {
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float factor = atof(&command[7]);
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return createSetAirtimeFactorRequest(factor);
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} else if (strcmp(command, "ann") == 0) {
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return createAnnounceRequest();
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}
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return NULL; // unknown command
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}
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void sendCommand(mesh::Packet* pkt) {
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if (server_path_len < 0) {
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sendFlood(pkt);
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} else {
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sendDirect(pkt, server_path, server_path_len);
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}
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}
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};
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StdRNG fast_rng;
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SimpleMeshTables tables;
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#if defined(P_LORA_SCLK)
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SPIClass spi;
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CustomSX1262 radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, spi);
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#else
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CustomSX1262 radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY);
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#endif
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MyMesh the_mesh(*new CustomSX1262Wrapper(radio, board), fast_rng, *new VolatileRTCClock(), tables);
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void halt() {
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while (1) ;
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}
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static char command[MAX_TEXT_LEN+1];
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#include <SHA256.h>
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void setup() {
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Serial.begin(115200);
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delay(5000);
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board.begin();
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#if defined(P_LORA_SCLK)
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spi.begin(P_LORA_SCLK, P_LORA_MISO, P_LORA_MOSI);
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int status = radio.begin(LORA_FREQ, LORA_BW, LORA_SF, LORA_CR, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, 22, 8);
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#else
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int status = radio.begin(LORA_FREQ, LORA_BW, LORA_SF, LORA_CR, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, 22, 8);
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#endif
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if (status != RADIOLIB_ERR_NONE) {
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Serial.print("ERROR: radio init failed: ");
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Serial.println(status);
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halt();
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}
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fast_rng.begin(radio.random(0x7FFFFFFF));
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/* add this to tests
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uint8_t mac_encrypted[CIPHER_MAC_SIZE+CIPHER_BLOCK_SIZE];
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const char *orig_msg = "original";
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int enc_len = mesh::Utils::encryptThenMAC(mesh.admin_secret, mac_encrypted, (const uint8_t *) orig_msg, strlen(orig_msg));
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char decrypted[CIPHER_BLOCK_SIZE*2];
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int len = mesh::Utils::MACThenDecrypt(mesh.admin_secret, (uint8_t *)decrypted, mac_encrypted, enc_len);
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if (len > 0) {
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decrypted[len] = 0;
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Serial.print("decrypted text: "); Serial.println(decrypted);
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} else {
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Serial.println("MACs DONT match!");
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}
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*/
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Serial.println("Help:");
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Serial.println(" enter 'key' to generate new keypair");
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Serial.println(" enter 'stats' to request repeater stats");
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Serial.println(" enter 'setclock {unix-epoch-seconds}' to set repeater's clock");
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Serial.println(" enter 'set AF={factor}' to set airtime budget factor");
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Serial.println(" enter 'ann' to make repeater re-announce to mesh");
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the_mesh.begin();
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command[0] = 0;
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}
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void loop() {
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int len = strlen(command);
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while (Serial.available() && len < sizeof(command)-1) {
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char c = Serial.read();
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if (c != '\n') {
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command[len++] = c;
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command[len] = 0;
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}
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Serial.print(c);
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}
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if (len == sizeof(command)-1) { // command buffer full
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command[sizeof(command)-1] = '\r';
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}
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if (len > 0 && command[len - 1] == '\r') { // received complete line
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command[len - 1] = 0; // replace newline with C string null terminator
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if (strcmp(command, "key") == 0) {
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mesh::LocalIdentity new_id(the_mesh.getRNG());
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new_id.printTo(Serial);
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} else {
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mesh::Packet* pkt = the_mesh.parseCommand(command);
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if (pkt) {
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the_mesh.sendCommand(pkt);
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Serial.println(" (request sent)");
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} else {
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Serial.print(" ERROR: unknown command: "); Serial.println(command);
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}
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}
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command[0] = 0; // reset command buffer
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}
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the_mesh.loop();
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}
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