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85 lines
2.8 KiB
85 lines
2.8 KiB
10 months ago
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "KISS.h"
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#include "Serial.h"
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int frame_len;
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bool IN_FRAME;
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bool ESCAPE;
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uint8_t kiss_command = CMD_UNKNOWN;
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uint8_t frame_buffer[MAX_PAYLOAD];
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uint8_t write_buffer[MAX_PAYLOAD*2+3];
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extern bool verbose;
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extern bool daemonize;
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extern int attached_if;
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extern int device_type;
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extern void cleanup(void);
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void kiss_frame_received(int frame_len) {
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if ( (device_type == IF_TUN && frame_len >= TUN_MIN_FRAME_SIZE) || (device_type == IF_TAP && frame_len >= ETHERNET_MIN_FRAME_SIZE) ) {
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int written = write(attached_if, frame_buffer, frame_len);
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if (written == -1) {
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if (verbose && !daemonize) printf("Could not write received KISS frame (%d bytes) to network interface, is the interface up?\r\n", frame_len);
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} else if (written != frame_len) {
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if (!daemonize) printf("Error: Could only write %d of %d bytes to interface", written, frame_len);
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cleanup();
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exit(1);
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}
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if (verbose && !daemonize) printf("Got %d bytes from TNC, wrote %d bytes to interface\r\n", frame_len, written);
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}
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}
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void kiss_serial_read(uint8_t sbyte) {
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if (IN_FRAME && sbyte == FEND && kiss_command == CMD_DATA) {
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IN_FRAME = false;
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kiss_frame_received(frame_len);
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} else if (sbyte == FEND) {
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IN_FRAME = true;
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kiss_command = CMD_UNKNOWN;
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frame_len = 0;
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} else if (IN_FRAME && frame_len < MAX_PAYLOAD) {
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// Have a look at the command byte first
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if (frame_len == 0 && kiss_command == CMD_UNKNOWN) {
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// Strip of port nibble
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kiss_command = sbyte & 0x0F;
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} else if (kiss_command == CMD_DATA) {
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if (sbyte == FESC) {
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ESCAPE = true;
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} else {
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if (ESCAPE) {
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if (sbyte == TFEND) sbyte = FEND;
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if (sbyte == TFESC) sbyte = FESC;
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ESCAPE = false;
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}
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if (frame_len < MAX_PAYLOAD) {
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frame_buffer[frame_len++] = sbyte;
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}
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}
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}
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}
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}
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int kiss_write_frame(int serial_port, uint8_t* buffer, int frame_len) {
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int write_len = 0;
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write_buffer[write_len++] = FEND;
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write_buffer[write_len++] = CMD_DATA;
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for (int i = 0; i < frame_len; i++) {
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uint8_t byte = buffer[i];
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if (byte == FEND) {
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write_buffer[write_len++] = FESC;
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write_buffer[write_len++] = TFEND;
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} else if (byte == FESC) {
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write_buffer[write_len++] = FESC;
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write_buffer[write_len++] = TFESC;
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} else {
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write_buffer[write_len++] = byte;
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}
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}
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write_buffer[write_len++] = FEND;
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return write(serial_port, write_buffer, write_len);
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}
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