mirror of
https://github.com/markqvist/OpenModem.git
synced 2024-10-01 03:15:46 -04:00
657 lines
23 KiB
C
Executable File
657 lines
23 KiB
C
Executable File
#include <stdlib.h>
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#include <string.h>
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#include "device.h"
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#include "hardware/Serial.h"
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#include "hardware/LED.h"
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#include "hardware/Crypto.h"
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#include "util/FIFO16.h"
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#include "util/time.h"
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#include "util/Config.h"
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#include "KISS.h"
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uint8_t packet_queue[CONFIG_QUEUE_SIZE];
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uint8_t tx_buffer[AX25_MAX_FRAME_LEN];
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volatile uint8_t queue_height = 0;
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volatile size_t queued_bytes = 0;
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volatile size_t queue_cursor = 0;
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volatile size_t current_packet_start = 0;
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FIFOBuffer16 packet_starts;
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size_t packet_starts_buf[CONFIG_QUEUE_MAX_LENGTH+1];
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FIFOBuffer16 packet_lengths;
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size_t packet_lengths_buf[CONFIG_QUEUE_MAX_LENGTH+1];
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AX25Ctx *ax25ctx;
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Afsk *channel;
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Serial *serial;
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volatile ticks_t last_serial_read = 0;
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extern volatile int8_t afsk_peak;
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ticks_t last_csma_check = 0;
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size_t frame_len;
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bool IN_FRAME;
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bool ESCAPE;
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uint8_t command = CMD_UNKNOWN;
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bool log_ready = false;
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uint32_t log_index = 0;
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FIL log_fp;
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char log_fb[4];
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char log_filename[32];
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FRESULT log_fr;
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FILINFO log_fi;
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void kiss_init(AX25Ctx *ax25, Afsk *afsk, Serial *ser) {
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ax25ctx = ax25;
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serial = ser;
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channel = afsk;
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memset(packet_queue, 0, sizeof(packet_queue));
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memset(packet_starts_buf, 0, sizeof(packet_starts));
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memset(packet_lengths_buf, 0, sizeof(packet_lengths));
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fifo16_init(&packet_starts, packet_starts_buf, sizeof(packet_starts_buf));
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fifo16_init(&packet_lengths, packet_lengths_buf, sizeof(packet_lengths_buf));
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}
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void kiss_poll(void) {
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while (!fifo_isempty_locked(&uart0FIFO)) {
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char sbyte = fifo_pop_locked(&uart0FIFO);
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kiss_serialCallback(sbyte);
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last_serial_read = timer_clock();
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}
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}
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#if CONFIG_BENCHMARK_MODE
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size_t decodes = 0;
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#endif
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void kiss_messageCallback(AX25Ctx *ctx) {
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#if CONFIG_BENCHMARK_MODE
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decodes++;
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printf("%d\r\n", decodes);
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#else
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bool integrity_ok = false;
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if (crypto_enabled()) {
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size_t rxpos = 0;
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if (ctx->frame_len >= AX25_ENCRYPTED_MIN_LENGTH) {
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// Get padding size
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uint8_t padding = ctx->buf[rxpos++];
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size_t data_length = ctx->frame_len - 2 - 1 - CRYPTO_HMAC_SIZE - CRYPTO_KEY_SIZE;
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size_t hmac_offset = ctx->frame_len - 2 - CRYPTO_HMAC_SIZE;
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// Get HMAC
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uint8_t hmac[CRYPTO_HMAC_SIZE];
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memset(hmac, 0x00, CRYPTO_HMAC_SIZE);
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for (uint8_t i = 0; i < CRYPTO_HMAC_SIZE; i++) {
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size_t pos = hmac_offset + i;
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hmac[i] = ctx->buf[pos];
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}
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// Calculate HMAC
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crypto_generate_hmac(ctx->buf, ctx->frame_len-2-CRYPTO_HMAC_SIZE);
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bool HMAC_ok = true;
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for (uint8_t i = 0; i < CRYPTO_HMAC_SIZE; i++) {
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if (hmac[i] != crypto_work_block[i]) {
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HMAC_ok = false;
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break;
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}
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}
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if (HMAC_ok) {
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// Get IV
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for (uint8_t i = 0; i < CRYPTO_KEY_SIZE; i++) {
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crypto_work_block[i] = ctx->buf[rxpos++];
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}
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crypto_set_iv_from_workblock();
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crypto_prepare();
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uint8_t blocks = data_length / CRYPTO_KEY_SIZE;
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size_t decrypted_pos = 0;
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for (uint8_t block = 0; block < blocks; block++) {
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for (uint8_t i = 0; i < CRYPTO_KEY_SIZE; i++) {
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crypto_work_block[i] = ctx->buf[rxpos++];
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}
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crypto_decrypt_block(crypto_work_block);
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for (uint8_t i = 0; i < CRYPTO_KEY_SIZE; i++) {
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ctx->buf[decrypted_pos++] = crypto_work_block[i];
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}
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}
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ctx->frame_len = data_length - padding + 2;
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integrity_ok = true;
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}
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}
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} else {
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integrity_ok = true;
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}
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if (integrity_ok) {
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fputc(FEND, &serial->uart0);
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fputc(0x00, &serial->uart0);
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for (unsigned i = 0; i < ctx->frame_len-2; i++) {
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uint8_t b = ctx->buf[i];
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if (b == FEND) {
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fputc(FESC, &serial->uart0);
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fputc(TFEND, &serial->uart0);
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} else if (b == FESC) {
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fputc(FESC, &serial->uart0);
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fputc(TFESC, &serial->uart0);
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} else {
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fputc(b, &serial->uart0);
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}
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}
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fputc(FEND, &serial->uart0);
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if (config_log_packets && sd_mounted()) {
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if (log_ready || log_init()) {
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log_fr = f_open(&log_fp, log_filename, FA_OPEN_APPEND | FA_WRITE);
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if (log_fr == FR_OK) {
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// Write PCAP segment to file
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UINT written = 0;
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uint32_t pcap_ts_sec = rtc_seconds();
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uint32_t pcap_ts_usec = (rtc_milliseconds()*(uint32_t)1000);
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uint32_t pcap_incl_len = ctx->frame_len-2;
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uint32_t pcap_orig_len = ctx->frame_len-2;
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f_write(&log_fp, &pcap_ts_sec, sizeof(pcap_ts_sec), &written);
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f_write(&log_fp, &pcap_ts_usec, sizeof(pcap_ts_usec), &written);
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f_write(&log_fp, &pcap_incl_len, sizeof(pcap_incl_len), &written);
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f_write(&log_fp, &pcap_orig_len, sizeof(pcap_orig_len), &written);
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f_write(&log_fp, ctx->buf, ctx->frame_len-2, &written);
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// Close handle and flush to disk
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f_close(&log_fp);
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}
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}
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}
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}
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#endif
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}
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bool log_init(void) {
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if (sd_mounted()) {
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// Check that base dir exists
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log_fr = f_stat(PATH_BASE, &log_fi);
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if (log_fr == FR_NO_PATH || log_fr == FR_NO_FILE) {
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log_fr = f_mkdir(PATH_BASE);
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if (log_fr != FR_OK) {
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return false;
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} else {
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}
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}
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// Check that log dir exists
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log_fr = f_stat(PATH_LOG, &log_fi);
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if (log_fr == FR_NO_PATH || log_fr == FR_NO_FILE) {
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log_fr = f_mkdir(PATH_LOG);
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if (log_fr != FR_OK) {
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return false;
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}
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}
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if (load_log_index()) {
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memset(log_filename, 0x00, sizeof(log_filename));
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snprintf(log_filename, sizeof(log_filename), "%s/%lu.pcap", PATH_LOG, log_index);
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update_log_index();
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log_fr = f_open(&log_fp, log_filename, FA_CREATE_NEW | FA_WRITE);
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if (log_fr == FR_OK) {
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uint32_t pcap_magic_number = 0xa1b2c3d4;
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uint16_t pcap_maj_version = 0x0002;
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uint16_t pcap_min_version = 0x0004;
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int32_t pcap_thiszone = 0;
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uint32_t pcap_sigfigs = 0;
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uint32_t pcap_snaplen = AX25_MAX_FRAME_LEN;
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uint32_t pcap_network = 0x00000003;
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// Write PCAP header
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UINT written = 0;
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f_write(&log_fp, &pcap_magic_number, sizeof(pcap_magic_number), &written);
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f_write(&log_fp, &pcap_maj_version, sizeof(pcap_maj_version), &written);
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f_write(&log_fp, &pcap_min_version, sizeof(pcap_min_version), &written);
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f_write(&log_fp, &pcap_thiszone, sizeof(pcap_thiszone), &written);
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f_write(&log_fp, &pcap_sigfigs, sizeof(pcap_sigfigs), &written);
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f_write(&log_fp, &pcap_snaplen, sizeof(pcap_snaplen), &written);
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f_write(&log_fp, &pcap_network, sizeof(pcap_network), &written);
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// Close handle
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f_close(&log_fp);
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log_ready = true;
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return true;
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} else {
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return false;
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}
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} else {
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return false;
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}
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} else {
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return false;
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}
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}
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bool load_log_index(void) {
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if (sd_mounted()) {
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log_fr = f_open(&log_fp, PATH_LOG_INDEX, FA_READ);
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if (log_fr == FR_NO_FILE) {
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f_close(&log_fp);
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log_fr = f_open(&log_fp, PATH_LOG_INDEX, FA_CREATE_NEW | FA_WRITE);
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if (log_fr == FR_OK) {
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log_index = 0x00000000;
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memcpy(log_fb, &log_index, sizeof(log_index));
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UINT written = 0;
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log_fr = f_write(&log_fp, log_fb, sizeof(log_index), &written);
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f_close(&log_fp);
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}
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log_fr = f_open(&log_fp, PATH_LOG_INDEX, FA_READ);
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}
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if (log_fr == FR_OK) {
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UINT read = 0;
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log_fr = f_read(&log_fp, log_fb, sizeof(log_index), &read);
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f_close(&log_fp);
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if (log_fr == FR_OK && read == sizeof(log_index)) {
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memcpy(&log_index, log_fb, sizeof(log_index));
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return true;
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}
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}
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}
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f_close(&log_fp);
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return false;
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}
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bool update_log_index(void) {
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log_fr = f_open(&log_fp, PATH_LOG_INDEX, FA_WRITE);
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if (log_fr == FR_OK) {
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log_index++;
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memcpy(log_fb, &log_index, sizeof(log_index));
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UINT written = 0;
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log_fr = f_write(&log_fp, log_fb, sizeof(log_index), &written);
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f_close(&log_fp);
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if (log_fr == FR_OK && written == sizeof(log_index)) {
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return true;
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}
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}
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return false;
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}
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void kiss_csma(void) {
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if (queue_height > 0) {
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#if BITRATE == 2400
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if (!channel->hdlc.dcd) {
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ticks_t timeout = last_serial_read + ms_to_ticks(CONFIG_SERIAL_TIMEOUT_MS);
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if (timer_clock() > timeout) {
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if (config_p == 255) {
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kiss_flushQueue();
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} else {
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ticks_t csma_timeout = last_csma_check + ms_to_ticks(config_slottime);
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if (timer_clock() > csma_timeout) {
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uint8_t r = (uint8_t)random();
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if (r < config_p) {
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kiss_flushQueue();
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} else {
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last_csma_check = timer_clock();
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}
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}
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}
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}
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}
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#else
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if (!channel->hdlc.dcd) {
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if (config_p == 255) {
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kiss_flushQueue();
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} else {
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ticks_t csma_timeout = last_csma_check + ms_to_ticks(config_slottime);
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if (timer_clock() > csma_timeout) {
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uint8_t r = (uint8_t)random();
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if (r < config_p) {
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kiss_flushQueue();
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} else {
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last_csma_check = timer_clock();
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}
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}
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}
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}
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#endif
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}
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}
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volatile bool queue_flushing = false;
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void kiss_flushQueue(void) {
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if (!queue_flushing) {
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queue_flushing = true;
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size_t processed = 0;
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for (size_t n = 0; n < queue_height; n++) {
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size_t start = fifo16_pop_locked(&packet_starts);
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size_t length = fifo16_pop_locked(&packet_lengths);
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if (length >= AX25_MIN_PAYLOAD) {
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if (crypto_enabled()) {
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uint8_t padding = CRYPTO_KEY_SIZE - (length % CRYPTO_KEY_SIZE);
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if (padding == CRYPTO_KEY_SIZE) padding = 0;
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uint8_t blocks = (length + padding) / CRYPTO_KEY_SIZE;
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if (crypto_generate_iv()) {
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crypto_prepare();
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size_t tx_pos = 0;
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tx_buffer[tx_pos++] = padding;
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uint8_t *iv = crypto_get_iv();
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for (uint8_t i = 0; i < CRYPTO_KEY_SIZE; i++) {
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tx_buffer[tx_pos++] = iv[i];
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}
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// Encrypt each block
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for (uint8_t i = 0; i < blocks; i++) {
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if (i < blocks-1 || padding == 0) {
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for (uint8_t j = 0; j < CRYPTO_KEY_SIZE; j++) {
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size_t pos = (start+j)%CONFIG_QUEUE_SIZE;
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crypto_work_block[j] = packet_queue[pos];
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}
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start += CRYPTO_KEY_SIZE;
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} else {
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for (uint8_t j = 0; j < CRYPTO_KEY_SIZE - padding; j++) {
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size_t pos = (start+j)%CONFIG_QUEUE_SIZE;
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crypto_work_block[j] = packet_queue[pos];
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}
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for (uint8_t j = CRYPTO_KEY_SIZE - padding; j < CRYPTO_KEY_SIZE; j++) {
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crypto_work_block[j] = 0xFF;
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}
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}
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crypto_encrypt_block(crypto_work_block);
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for (uint8_t j = 0; j < CRYPTO_KEY_SIZE; j++) {
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tx_buffer[tx_pos++] = crypto_work_block[j];
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}
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}
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// Genereate MAC
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crypto_generate_hmac(tx_buffer, tx_pos);
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for (uint8_t i = 0; i < CRYPTO_HMAC_SIZE; i++) {
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tx_buffer[tx_pos++] = crypto_work_block[i];
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}
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// Check size and send
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if (tx_pos <= AX25_MAX_FRAME_LEN) {
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ax25_sendRaw(ax25ctx, tx_buffer, tx_pos);
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processed++;
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} else {
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processed++;
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}
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} else {
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LED_indicate_error_crypto();
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}
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} else {
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for (size_t i = 0; i < length; i++) {
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size_t pos = (start+i)%CONFIG_QUEUE_SIZE;
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tx_buffer[i] = packet_queue[pos];
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}
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if (config_log_packets && sd_mounted()) {
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if (log_ready || log_init()) {
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log_fr = f_open(&log_fp, log_filename, FA_OPEN_APPEND | FA_WRITE);
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if (log_fr == FR_OK) {
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// Write PCAP segment to file
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UINT written = 0;
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uint32_t pcap_ts_sec = rtc_seconds();
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uint32_t pcap_ts_usec = (rtc_milliseconds()*(uint32_t)1000);
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uint32_t pcap_incl_len = length;
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uint32_t pcap_orig_len = length;
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f_write(&log_fp, &pcap_ts_sec, sizeof(pcap_ts_sec), &written);
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f_write(&log_fp, &pcap_ts_usec, sizeof(pcap_ts_usec), &written);
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f_write(&log_fp, &pcap_incl_len, sizeof(pcap_incl_len), &written);
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f_write(&log_fp, &pcap_orig_len, sizeof(pcap_orig_len), &written);
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f_write(&log_fp, tx_buffer, length, &written);
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// Close handle and flush to disk
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f_close(&log_fp);
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}
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}
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}
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ax25_sendRaw(ax25ctx, tx_buffer, length);
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processed++;
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}
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}
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}
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// TODO: Maybe remove this error state and fail
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// silently, while reverting to operational state
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// by resetting all buffers
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if (processed < queue_height) {
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while (true) {
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LED_TX_ON();
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LED_RX_ON();
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}
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}
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queue_height = 0;
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queued_bytes = 0;
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queue_flushing = false;
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}
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}
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void kiss_serialCallback(uint8_t sbyte) {
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if (IN_FRAME && sbyte == FEND && command == CMD_DATA) {
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IN_FRAME = false;
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if (queue_height < CONFIG_QUEUE_MAX_LENGTH && queued_bytes < CONFIG_QUEUE_SIZE) {
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size_t s = current_packet_start;
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size_t e = queue_cursor-1; if (e == -1) e = CONFIG_QUEUE_SIZE-1;
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size_t l;
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if (s != e) {
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l = (s < e) ? e - s + 1 : CONFIG_QUEUE_SIZE - s + e + 1;
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} else {
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l = 1;
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}
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if (l >= AX25_MIN_PAYLOAD) {
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queue_height++;
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fifo16_push_locked(&packet_starts, s);
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fifo16_push_locked(&packet_lengths, l);
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current_packet_start = queue_cursor;
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}
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}
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} else if (sbyte == FEND) {
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IN_FRAME = true;
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command = CMD_UNKNOWN;
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frame_len = 0;
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} else if (IN_FRAME && frame_len < AX25_MAX_PAYLOAD) {
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// Have a look at the command byte first
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|
if (frame_len == 0 && command == CMD_UNKNOWN) {
|
|
command = sbyte;
|
|
if (command == CMD_DATA) current_packet_start = queue_cursor;
|
|
} else if (command == CMD_DATA) {
|
|
if (sbyte == FESC) {
|
|
ESCAPE = true;
|
|
} else {
|
|
if (ESCAPE) {
|
|
if (sbyte == TFEND) sbyte = FEND;
|
|
if (sbyte == TFESC) sbyte = FESC;
|
|
ESCAPE = false;
|
|
}
|
|
if (queue_height < CONFIG_QUEUE_MAX_LENGTH && queued_bytes < CONFIG_QUEUE_SIZE) {
|
|
queued_bytes++;
|
|
packet_queue[queue_cursor++] = sbyte;
|
|
if (queue_cursor == CONFIG_QUEUE_SIZE) queue_cursor = 0;
|
|
}
|
|
}
|
|
} else if (command == CMD_PREAMBLE) {
|
|
config_preamble = sbyte * 10UL;
|
|
} else if (command == CMD_TXTAIL) {
|
|
config_tail = sbyte * 10UL;
|
|
} else if (command == CMD_SLOTTIME) {
|
|
config_slottime = sbyte * 10UL;
|
|
} else if (command == CMD_P) {
|
|
config_p = sbyte;
|
|
} else if (command == CMD_SAVE_CONFIG) {
|
|
config_save();
|
|
} else if (command == CMD_REBOOT) {
|
|
if (sbyte == CMD_REBOOT_CONFIRM) {
|
|
config_soft_reboot();
|
|
}
|
|
} else if (command == CMD_LED_INTENSITY) {
|
|
if (sbyte == FESC) {
|
|
ESCAPE = true;
|
|
} else {
|
|
if (ESCAPE) {
|
|
if (sbyte == TFEND) sbyte = FEND;
|
|
if (sbyte == TFESC) sbyte = FESC;
|
|
ESCAPE = false;
|
|
}
|
|
LED_setIntensity(sbyte);
|
|
}
|
|
} else if (command == CMD_OUTPUT_GAIN) {
|
|
if (sbyte == FESC) { ESCAPE = true; } else {
|
|
if (ESCAPE) {
|
|
if (sbyte == TFEND) sbyte = FEND;
|
|
if (sbyte == TFESC) sbyte = FESC;
|
|
ESCAPE = false;
|
|
}
|
|
config_set_output_gain(sbyte);
|
|
}
|
|
} else if (command == CMD_INPUT_GAIN) {
|
|
if (sbyte == FESC) { ESCAPE = true; } else {
|
|
if (ESCAPE) {
|
|
if (sbyte == TFEND) sbyte = FEND;
|
|
if (sbyte == TFESC) sbyte = FESC;
|
|
ESCAPE = false;
|
|
}
|
|
config_set_input_gain(sbyte);
|
|
}
|
|
} else if (command == CMD_PASSALL) {
|
|
if (sbyte == FESC) { ESCAPE = true; } else {
|
|
if (ESCAPE) {
|
|
if (sbyte == TFEND) sbyte = FEND;
|
|
if (sbyte == TFESC) sbyte = FESC;
|
|
ESCAPE = false;
|
|
}
|
|
config_set_passall(sbyte);
|
|
}
|
|
} else if (command == CMD_LOG_PACKETS) {
|
|
if (sbyte == FESC) { ESCAPE = true; } else {
|
|
if (ESCAPE) {
|
|
if (sbyte == TFEND) sbyte = FEND;
|
|
if (sbyte == TFESC) sbyte = FESC;
|
|
ESCAPE = false;
|
|
}
|
|
config_set_log_packets(sbyte);
|
|
}
|
|
} else if (command == CMD_GPS_MODE) {
|
|
if (sbyte == FESC) { ESCAPE = true; } else {
|
|
if (ESCAPE) {
|
|
if (sbyte == TFEND) sbyte = FEND;
|
|
if (sbyte == TFESC) sbyte = FESC;
|
|
ESCAPE = false;
|
|
}
|
|
config_set_gps_mode(sbyte);
|
|
}
|
|
} else if (command == CMD_BT_MODE) {
|
|
if (sbyte == FESC) { ESCAPE = true; } else {
|
|
if (ESCAPE) {
|
|
if (sbyte == TFEND) sbyte = FEND;
|
|
if (sbyte == TFESC) sbyte = FESC;
|
|
ESCAPE = false;
|
|
}
|
|
config_set_bt_mode(sbyte);
|
|
}
|
|
} else if (command == CMD_SERIAL_BAUDRATE) {
|
|
config_set_serial_baudrate(sbyte);
|
|
// TODO: Remove this
|
|
} else if (command == CMD_PRINT_CONFIG) {
|
|
config_print();
|
|
kiss_output_modem_mode();
|
|
} else if (command == CMD_AUDIO_PEAK) {
|
|
if (sbyte == 0x01) {
|
|
kiss_output_afsk_peak();
|
|
}
|
|
} else if (command == CMD_ENABLE_DIAGNOSTICS) {
|
|
if (sbyte == 0x00) {
|
|
config_disable_diagnostics();
|
|
} else {
|
|
config_enable_diagnostics();
|
|
}
|
|
} else if (command == CMD_MODE) {
|
|
if (sbyte == 0x00) {
|
|
kiss_output_modem_mode();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void kiss_output_modem_mode(void) {
|
|
fputc(FEND, &serial->uart0);
|
|
fputc(CMD_MODE, &serial->uart0);
|
|
if (BITRATE == 300) {
|
|
fputc(MODE_AFSK_300, &serial->uart0);
|
|
} else if (BITRATE == 1200) {
|
|
fputc(MODE_AFSK_1200, &serial->uart0);
|
|
} else if (BITRATE == 2400) {
|
|
fputc(MODE_AFSK_2400, &serial->uart0);
|
|
}
|
|
fputc(FEND, &serial->uart0);
|
|
}
|
|
|
|
void kiss_output_afsk_peak(void) {
|
|
fputc(FEND, &serial->uart0);
|
|
fputc(CMD_AUDIO_PEAK, &serial->uart0);
|
|
uint8_t b = afsk_peak;
|
|
|
|
if (b == FEND) {
|
|
fputc(FESC, &serial->uart0);
|
|
fputc(TFEND, &serial->uart0);
|
|
} else if (b == FESC) {
|
|
fputc(FESC, &serial->uart0);
|
|
fputc(TFESC, &serial->uart0);
|
|
} else {
|
|
fputc(b, &serial->uart0);
|
|
}
|
|
|
|
fputc(FEND, &serial->uart0);
|
|
}
|
|
|
|
void kiss_output_config(uint8_t* data, size_t length) {
|
|
fputc(FEND, &serial->uart0);
|
|
fputc(CMD_PRINT_CONFIG, &serial->uart0);
|
|
for (unsigned i = 0; i < length; i++) {
|
|
uint8_t b = data[i];
|
|
if (b == FEND) {
|
|
fputc(FESC, &serial->uart0);
|
|
fputc(TFEND, &serial->uart0);
|
|
} else if (b == FESC) {
|
|
fputc(FESC, &serial->uart0);
|
|
fputc(TFESC, &serial->uart0);
|
|
} else {
|
|
fputc(b, &serial->uart0);
|
|
}
|
|
}
|
|
fputc(FEND, &serial->uart0);
|
|
} |