mirror of
https://github.com/markqvist/tncattach.git
synced 2024-11-26 22:28:59 -05:00
Basic implementation done
This commit is contained in:
Mark Qvist
parent
4353d21717
commit
85ebb3d7b1
9
Constants.h
Normal file
9
Constants.h
Normal file
@ -0,0 +1,9 @@
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#define IF_TAP 1
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#define IF_TUN 2
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#define ETHERNET_MIN_FRAME_SIZE 14
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#define TUN_MIN_FRAME_SIZE 5
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#define MTU_MIN 74
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#define MTU_MAX 1522
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#define MTU_DEFAULT 329
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14
KISS.c
14
KISS.c
@ -12,8 +12,20 @@ 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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void kiss_frame_received(int frame_len) {
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extern bool verbose;
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extern int attached_if;
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extern void cleanup(void);
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void kiss_frame_received(int frame_len) {
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if (verbose) printf("Got KISS frame\r\n");
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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) printf("Could not write received KISS frame to network interface, is the interface up?\r\n");
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} else if (written != frame_len) {
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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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}
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void kiss_serial_read(uint8_t sbyte) {
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5
KISS.h
5
KISS.h
@ -1,3 +1,6 @@
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#include <stdint.h>
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#include "Constants.h"
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#define FEND 0xC0
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#define FESC 0xDB
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#define TFEND 0xDC
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@ -12,7 +15,7 @@
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#define CMD_FULLDUPLEX 0x05
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#define CMD_SETHARDWARE 0x06
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#define MAX_PAYLOAD 1522
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#define MAX_PAYLOAD MTU_MAX
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void kiss_serial_read(uint8_t sbyte);
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int kiss_write_frame(int serial_port, uint8_t* buffer, int frame_len);
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8
Serial.c
8
Serial.c
@ -1,11 +1,15 @@
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#include "Serial.h"
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extern void cleanup();
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int open_port(char* port) {
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int fd;
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fd = open(port, O_RDWR | O_NOCTTY | O_SYNC | O_NDELAY);
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if (fd == -1) {
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perror("The serial port could not be opened");
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cleanup();
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exit(1);
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} else {
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fcntl(fd, F_SETFL, 0);
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}
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@ -85,7 +89,9 @@ bool setup_port(int fd, int speed) {
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set_speed(&tty, B230400);
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break;
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default:
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printf("Error: Invalid port speed %d specified", speed);
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printf("Error: Invalid port speed %d specified\r\n", speed);
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cleanup();
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exit(1);
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return false;
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}
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2
Serial.h
2
Serial.h
@ -1,10 +1,12 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <termios.h>
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#include "Constants.h"
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int open_port(char* port);
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int close_port(int fd);
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129
TAP.c
129
TAP.c
@ -1,3 +1,132 @@
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#include "TAP.h"
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char tap_name[IFNAMSIZ];
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extern bool verbose;
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extern bool noipv6;
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extern bool set_ipv4;
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extern bool set_netmask;
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extern bool noup;
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extern int mtu;
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extern int device_type;
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extern char if_name[IFNAMSIZ];
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extern char* ipv4_addr;
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extern char* netmask;
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extern void cleanup();
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int open_tap(void) {
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struct ifreq ifr;
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int fd = open("/dev/net/tun", O_RDWR);
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if (fd < 0) {
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perror("Could not open clone device");
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exit(1);
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} else {
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memset(&ifr, 0, sizeof(ifr));
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// TODO: Enable PI header again?
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if (device_type == IF_TAP) {
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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} else if (device_type == IF_TUN) {
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ifr.ifr_flags = IFF_TUN;
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} else {
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printf("Error: Unsupported interface type\r\n");
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cleanup();
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exit(1);
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}
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strcpy(tap_name, "tnc%d");
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strncpy(ifr.ifr_name, tap_name, IFNAMSIZ);
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if (ioctl(fd, TUNSETIFF, &ifr) < 0) {
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perror("Could not configure network interface");
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exit(1);
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} else {
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strcpy(if_name, ifr.ifr_name);
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int inet = socket(AF_INET, SOCK_DGRAM, 0);
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if (inet == -1) {
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perror("Could not open AF_INET socket\r\n");
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cleanup();
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exit(1);
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} else {
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if (ioctl(inet, SIOCGIFFLAGS, &ifr) < 0) {
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perror("Could not get interface flags from kernel");
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close(inet);
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cleanup();
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exit(1);
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} else {
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ifr.ifr_mtu = mtu;
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if (ioctl(inet, SIOCSIFMTU, &ifr) < 0) {
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perror("Could not configure interface MTU");
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close(inet);
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cleanup();
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exit(1);
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}
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if (!noup) {
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ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
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if (ioctl(inet, SIOCSIFFLAGS, &ifr) < 0) {
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perror("Could not bring up interface");
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close(inet);
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cleanup();
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exit(1);
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} else {
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if (set_ipv4) {
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struct ifreq a_ifr;
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struct sockaddr_in addr, snm;
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memset(&a_ifr, 0, sizeof(a_ifr));
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memset(&addr, 0, sizeof(addr));
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memset(&snm, 0, sizeof(addr));
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strncpy(a_ifr.ifr_name, ifr.ifr_name, IFNAMSIZ);
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addr.sin_family = AF_INET;
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snm.sin_family = AF_INET;
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int addr_conversion = inet_pton(AF_INET, ipv4_addr, &(addr.sin_addr));
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if (addr_conversion != 1) {
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printf("Error: Invalid IPv4 address specified\r\n");
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close(inet);
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cleanup();
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exit(1);
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} else {
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a_ifr.ifr_addr = *(struct sockaddr*)&addr;
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if (ioctl(inet, SIOCSIFADDR, &a_ifr) < 0) {
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perror("Could not set IP-address");
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close(inet);
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cleanup();
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exit(1);
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} else {
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if (set_netmask) {
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int snm_conversion = inet_pton(AF_INET, netmask, &(snm.sin_addr));
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if (snm_conversion != 1) {
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printf("Error: Invalid subnet mask specified\r\n");
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close(inet);
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cleanup();
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exit(1);
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} else {
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a_ifr.ifr_addr = *(struct sockaddr*)&snm;
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if (ioctl(inet, SIOCSIFNETMASK, &a_ifr) < 0) {
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perror("Could not set subnet mask");
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close(inet);
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cleanup();
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exit(1);
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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return fd;
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}
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}
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}
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int close_tap(int tap_fd) {
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return close(tap_fd);
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}
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16
TAP.h
16
TAP.h
@ -0,0 +1,16 @@
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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//#include <sys/socket.h>
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//#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "Constants.h"
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int open_tap(void);
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int close_tap(int tap_fd);
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392
tncattach.c
392
tncattach.c
@ -1,44 +1,404 @@
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#include <stdlib.h>
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#include <stdbool.h>
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#include <signal.h>
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#include <poll.h>
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#include <argp.h>
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#include "Constants.h"
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#include "Serial.h"
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#include "KISS.h"
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#include "TAP.h"
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#define BAUDRATE_DEFAULT 0
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#define SERIAL_BUFFER_SIZE 512
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int attached_port;
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uint8_t serial_buffer[512];
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#define IF_FD_INDEX 0
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#define TNC_FD_INDEX 1
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#define N_FDS 2
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struct pollfd fds[N_FDS];
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int attached_tnc;
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int attached_if;
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char if_name[IFNAMSIZ];
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uint8_t serial_buffer[MTU_MAX];
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uint8_t if_buffer[MTU_MAX];
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bool verbose = false;
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bool noipv6 = false;
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bool noup = false;
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bool daemonize = false;
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bool set_ipv4 = false;
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bool set_netmask = false;
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char* ipv4_addr;
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char* netmask;
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int mtu;
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int device_type = IF_TUN;
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void cleanup(void) {
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close_port(attached_tnc);
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close_tap(attached_if);
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}
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void signal_handler(int signal) {
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printf("\r\nClosing serial port...\r\n");
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close_port(attached_port);
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cleanup();
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exit(0);
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}
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void read_loop(tnc) {
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bool is_ipv6(uint8_t* frame) {
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if (device_type == IF_TAP) {
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if (frame[12] == 0x86 && frame[13] == 0xdd) {
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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 if (device_type == IF_TUN) {
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if (frame[2] == 0x86 && frame[3] == 0xdd) {
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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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printf("Error: Unsupported interface type\r\n");
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cleanup();
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exit(1);
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}
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}
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void read_loop(void) {
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bool should_continue = true;
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int min_frame_size;
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if (device_type == IF_TAP) {
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min_frame_size = ETHERNET_MIN_FRAME_SIZE;
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} else if (device_type == IF_TUN) {
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min_frame_size = TUN_MIN_FRAME_SIZE;
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} else {
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printf("Error: Unsupported interface type\r\n");
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cleanup();
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exit(1);
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}
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while (should_continue) {
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int len = read(attached_port, serial_buffer, sizeof(serial_buffer));
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if (len > 0) {
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for (int i = 0; i < len; i++) {
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int poll_result = poll(fds, 2, -1);
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if (poll_result != -1) {
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for (int fdi = 0; fdi < N_FDS; fdi++) {
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if (fds[fdi].revents != 0) {
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// Check for hangup event
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if (fds[fdi].revents & POLLHUP) {
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if (fdi == IF_FD_INDEX) {
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printf("Received hangup from interface\r\n");
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cleanup();
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exit(1);
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}
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if (fdi == TNC_FD_INDEX) {
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printf("Received hangup from TNC\r\n");
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cleanup();
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exit(1);
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}
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}
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// Check for error event
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if (fds[fdi].revents & POLLERR) {
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if (fdi == IF_FD_INDEX) {
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perror("Received error event from interface\r\n");
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cleanup();
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exit(1);
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}
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if (fdi == TNC_FD_INDEX) {
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perror("Received error event from TNC\r\n");
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cleanup();
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exit(1);
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}
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}
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// If data is ready, read it
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if (fds[fdi].revents & POLLIN) {
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if (fdi == IF_FD_INDEX) {
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int if_len = read(attached_if, if_buffer, sizeof(if_buffer));
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if (if_len > 0) {
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if (if_len >= min_frame_size) {
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if (!noipv6 || (noipv6 && !is_ipv6(if_buffer))) {
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kiss_write_frame(attached_tnc, if_buffer, if_len);
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}
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}
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} else {
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printf("Error: Could not read from network interface, exiting now\r\n");
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cleanup();
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exit(1);
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}
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}
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if (fdi == TNC_FD_INDEX) {
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int tnc_len = read(attached_tnc, serial_buffer, sizeof(serial_buffer));
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if (tnc_len > 0) {
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if (verbose) printf("Data from TNC: %d bytes.\r\n", tnc_len);
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for (int i = 0; i < tnc_len; i++) {
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kiss_serial_read(serial_buffer[i]);
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}
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} else {
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printf("Error: Could not read from serial port, exiting now\r\n");
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close_port(attached_port);
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printf("Error: Could not read from TNC, exiting now\r\n");
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cleanup();
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exit(1);
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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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should_continue = false;
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}
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}
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cleanup();
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exit(1);
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}
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int main() {
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signal(SIGINT, signal_handler);
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const char *argp_program_version = "tncattach 0.1.1";
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const char *argp_program_bug_address = "<mark@unsigned.io>";
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static char doc[] = "\r\nAttach TNC devices as system network interfaces\vAs an example, to attach the TNC connected to /dev/ttyUSB0 as a full ethernet device with an MTU of 576 bytes and assign an IPv4 address, use the following command:\r\n\r\n\ttncattach /dev/ttyUSB0 115200 -m 576 -e --ipv4 10.0.0.1/24\r\n\r\nTo create an interface that doesn't use ethernet, but transports IP directly, and filters IPv6 packets out, a command like the following can be used:\r\n\r\n\ttncattach /dev/ttyUSB0 115200 --noipv6 --ipv4 10.0.0.1/24";
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static char args_doc[] = "port baudrate";
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static struct argp_option options[] = {
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{ "mtu", 'm', "MTU", 0, "Specify interface MTU"},
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{ "daemon", 'd', 0, 0, "Run tncattach as a daemon"},
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{ "ethernet", 'e', 0, 0, "Create a full ethernet device"},
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{ "ipv4", 'i', "IP_ADDRESS", 0, "Configure an IPv4 address on interface"},
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{ "noipv6", 'n', 0, 0, "Filter IPv6 traffic from reaching TNC"},
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{ "noup", 1, 0, 0, "Only create interface, don't bring it up"},
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{ "verbose", 'v', 0, 0, "Enable verbose output"},
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{ 0 }
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};
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attached_port = open_port("/dev/tty.usbserial-");
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if (setup_port(attached_port, 115200)) {
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printf("Port open\r\n");
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read_loop(attached_port);
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#define N_ARGS 2
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struct arguments {
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char *args[N_ARGS];
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char *ipv4;
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int baudrate;
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int mtu;
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bool tap;
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bool daemon;
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bool verbose;
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bool set_ipv4;
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bool set_netmask;
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bool noipv6;
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bool noup;
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};
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static error_t parse_opt(int key, char *arg, struct argp_state *state) {
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struct arguments *arguments = state->input;
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switch (key) {
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case 'v':
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arguments->verbose = true;
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break;
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case 'e':
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arguments->tap = true;
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break;
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case 'm':
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arguments->mtu = atoi(arg);
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if (arguments->mtu < MTU_MIN || arguments->mtu > MTU_MAX) {
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printf("Error: Invalid MTU specified\r\n\r\n");
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argp_usage(state);
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}
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break;
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case 'i':
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arguments->ipv4 = arg;
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arguments->set_ipv4 = true;
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if (strchr(arg, '/')) {
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char* net = strchr(arg, '/');
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int pos = net-arg;
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ipv4_addr = (char*)malloc(pos+1);
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int mask = atoi(net+1);
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strncpy(ipv4_addr, arg, pos);
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switch (mask) {
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case 0:
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netmask = "0.0.0.0";
|
||||
break;
|
||||
case 1:
|
||||
netmask = "128.0.0.0";
|
||||
break;
|
||||
case 2:
|
||||
netmask = "192.0.0.0";
|
||||
break;
|
||||
case 3:
|
||||
netmask = "224.0.0.0";
|
||||
break;
|
||||
case 4:
|
||||
netmask = "240.0.0.0";
|
||||
break;
|
||||
case 5:
|
||||
netmask = "248.0.0.0";
|
||||
break;
|
||||
case 6:
|
||||
netmask = "252.0.0.0";
|
||||
break;
|
||||
case 7:
|
||||
netmask = "254.0.0.0";
|
||||
break;
|
||||
case 8:
|
||||
netmask = "255.0.0.0";
|
||||
break;
|
||||
case 9:
|
||||
netmask = "255.128.0.0";
|
||||
break;
|
||||
case 10:
|
||||
netmask = "255.192.0.0";
|
||||
break;
|
||||
case 11:
|
||||
netmask = "255.224.0.0";
|
||||
break;
|
||||
case 12:
|
||||
netmask = "255.240.0.0";
|
||||
break;
|
||||
case 13:
|
||||
netmask = "255.248.0.0";
|
||||
break;
|
||||
case 14:
|
||||
netmask = "255.252.0.0";
|
||||
break;
|
||||
case 15:
|
||||
netmask = "255.254.0.0";
|
||||
break;
|
||||
case 16:
|
||||
netmask = "255.255.0.0";
|
||||
break;
|
||||
case 17:
|
||||
netmask = "255.255.128.0";
|
||||
break;
|
||||
case 18:
|
||||
netmask = "255.255.192.0";
|
||||
break;
|
||||
case 19:
|
||||
netmask = "255.255.224.0";
|
||||
break;
|
||||
case 20:
|
||||
netmask = "255.255.240.0";
|
||||
break;
|
||||
case 21:
|
||||
netmask = "255.255.248.0";
|
||||
break;
|
||||
case 22:
|
||||
netmask = "255.255.252.0";
|
||||
break;
|
||||
case 23:
|
||||
netmask = "255.255.254.0";
|
||||
break;
|
||||
case 24:
|
||||
netmask = "255.255.255.0";
|
||||
break;
|
||||
case 25:
|
||||
netmask = "255.255.255.128";
|
||||
break;
|
||||
case 26:
|
||||
netmask = "255.255.255.192";
|
||||
break;
|
||||
case 27:
|
||||
netmask = "255.255.255.224";
|
||||
break;
|
||||
case 28:
|
||||
netmask = "255.255.255.240";
|
||||
break;
|
||||
case 29:
|
||||
netmask = "255.255.255.248";
|
||||
break;
|
||||
case 30:
|
||||
netmask = "255.255.255.252";
|
||||
break;
|
||||
case 31:
|
||||
netmask = "255.255.255.254";
|
||||
break;
|
||||
case 32:
|
||||
netmask = "255.255.255.255";
|
||||
break;
|
||||
|
||||
default:
|
||||
printf("Error: Invalid subnet mask specified\r\n");
|
||||
cleanup();
|
||||
exit(1);
|
||||
}
|
||||
|
||||
arguments->set_netmask = true;
|
||||
} else {
|
||||
arguments->set_netmask = false;
|
||||
ipv4_addr = (char*)malloc(strlen(arg)+1);
|
||||
strcpy(ipv4_addr, arg);
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
case 'n':
|
||||
arguments->noipv6 = true;
|
||||
break;
|
||||
|
||||
case 'd':
|
||||
arguments->daemon = true;
|
||||
arguments->verbose = false;
|
||||
break;
|
||||
|
||||
case 1:
|
||||
arguments->noup = true;
|
||||
break;
|
||||
|
||||
case ARGP_KEY_ARG:
|
||||
// Check if there's now too many text arguments
|
||||
if (state->arg_num >= N_ARGS) argp_usage(state);
|
||||
|
||||
// If not add to args
|
||||
arguments->args[state->arg_num] = arg;
|
||||
break;
|
||||
|
||||
case ARGP_KEY_END:
|
||||
// Check if there's too few text arguments
|
||||
if (state->arg_num < N_ARGS) argp_usage(state);
|
||||
break;
|
||||
|
||||
default:
|
||||
return ARGP_ERR_UNKNOWN;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct argp argp = {options, parse_opt, args_doc, doc};
|
||||
int main(int argc, char **argv) {
|
||||
struct arguments arguments;
|
||||
signal(SIGINT, signal_handler);
|
||||
|
||||
arguments.baudrate = BAUDRATE_DEFAULT;
|
||||
arguments.mtu = MTU_DEFAULT;
|
||||
arguments.tap = false;
|
||||
arguments.verbose = false;
|
||||
arguments.set_ipv4 = false;
|
||||
arguments.set_netmask = false;
|
||||
arguments.noipv6 = false;
|
||||
arguments.daemon = false;
|
||||
arguments.noup = false;
|
||||
|
||||
argp_parse(&argp, argc, argv, 0, 0, &arguments);
|
||||
arguments.baudrate = atoi(arguments.args[1]);
|
||||
|
||||
if (arguments.daemon) daemonize = true;
|
||||
if (arguments.verbose) verbose = true;
|
||||
if (arguments.tap) device_type = IF_TAP;
|
||||
if (arguments.noipv6) noipv6 = true;
|
||||
if (arguments.set_ipv4) set_ipv4 = true;
|
||||
if (arguments.set_netmask) set_netmask = true;
|
||||
if (arguments.noup) noup = true;
|
||||
mtu = arguments.mtu;
|
||||
|
||||
attached_if = open_tap();
|
||||
attached_tnc = open_port(arguments.args[0]);
|
||||
if (setup_port(attached_tnc, arguments.baudrate)) {
|
||||
printf("TNC interface configured as %s\r\n", if_name);
|
||||
fds[IF_FD_INDEX].fd = attached_if;
|
||||
fds[IF_FD_INDEX].events = POLLIN;
|
||||
fds[TNC_FD_INDEX].fd = attached_tnc;
|
||||
fds[TNC_FD_INDEX].events = POLLIN;
|
||||
read_loop();
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user