819 lines
18 KiB
C
819 lines
18 KiB
C
/*
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* Copyright (c) 2001, Adam Dunkels.
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* Copyright (c) 2009, Joakim Eriksson, Niclas Finne.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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* $Id: tapslip6.c,v 1.1 2010/10/25 10:42:41 salvopitru Exp $
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*/
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/**
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* \file
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* A driver for the uip6-bridge customized for STM32W. Thanks to
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* Adam Dunkels, Joakim Eriksson, Niclas Finne for the original
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* code.
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* \author
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* Salvatore Pitrulli <salvopitru@users.sourceforge.net>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <termios.h>
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#include <sys/ioctl.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 <err.h>
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int ssystem(const char *fmt, ...)
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__attribute__ ((__format__(__printf__, 1, 2)));
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void write_to_serial(void *inbuf, int len);
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#define PRINTF(...) if(verbose)printf(__VA_ARGS__)
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//#define PROGRESS(s) fprintf(stderr, s)
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#define PROGRESS(s) do { } while (0)
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#define USAGE_STRING "usage: tapslip6 [-B baudrate] [-s siodev] [-t tundev] [-a ipaddress[/prefixlen]|-p 64bit-prefix[/prefixlen]] [-c channel] [-r] [-v] [-h]"
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#define HELP_STRING "usage: tapslip6 [-B baudrate] [-s siodev] [-t tundev] [-a ipaddress[/prefixlen]|-p 64bit-prefix[/prefixlen]] [-c channel] [-r] [-v] [-h]\r\n\n\
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Options:\r\n\
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-B baudrate\tBaudrate of the serial port (default:115200).\r\n\
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-s siodev\tDevice that identifies the bridge (default: the first available\r\n\
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\t\tamong ttyUSB0, cuaU0 and ucom0)\r\n\
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-t tundev\tThe virtual network interface (default: tap0)\r\n\
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-c channel\t802.15.4 radio channel.\r\n\
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-r\t\tSet sniffer mode. \r\n\
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-a ipaddress/[prefixlen] The address to be assigned to the virtual network\r\n\
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\t\tadapter.\r\n\
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-p 64bit-prefix\tAutomatic assignment of the IPv6 address from the specified\r\n\
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\t\tsubnet prefix. It may be followed by the prefix length\r\n\
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\t\tfor the on-link determination.\r\n\
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-v\t\tVerbose. Print more infos.\r\n\
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-h\t\tShow this help.\r\n"
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typedef enum {
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false = 0,
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true = 1,
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} bool;
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char tundev[32] = { "tap0" };
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const char *ipaddr = NULL;
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char *ipprefix = NULL;
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char autoconf_addr[44] = { 0 };
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bool autoconf = false;
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bool verbose = false;
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struct uip_eth_addr {
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uint8_t addr[6];
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};
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struct uip_802154_longaddr {
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uint8_t addr[8];
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};
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static struct uip_eth_addr eth_addr;
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const struct uip_eth_addr eth_addr_null = { {0} };
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static int request_mac = 1;
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static int send_mac = 1;
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static int set_sniffer_mode = 1;
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static int set_channel = 1;
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static int sniffer_mode = 0;
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static int channel = 0;
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int ssystem(const char *fmt, ...)
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__attribute__ ((__format__(__printf__, 1, 2)));
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int ssystem(const char *fmt, ...)
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{
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char cmd[128];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(cmd, sizeof(cmd), fmt, ap);
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va_end(ap);
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printf("%s\n", cmd);
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fflush(stdout);
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return system(cmd);
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}
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#define SLIP_END 0300
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#define SLIP_ESC 0333
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#define SLIP_ESC_END 0334
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#define SLIP_ESC_ESC 0335
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static void print_packet(u_int8_t * p, int len)
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{
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int i;
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for (i = 0; i < len; i++) {
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printf("%02x", p[i]);
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if ((i & 3) == 3)
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printf(" ");
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if ((i & 15) == 15)
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printf("\n");
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}
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printf("\n");
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}
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int is_sensible_string(const unsigned char *s, int len)
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{
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int i;
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for (i = 1; i < len; i++) {
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if (s[i] == 0 || s[i] == '\r' || s[i] == '\n' || s[i] == '\t') {
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continue;
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}
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else if (s[i] < ' ' || '~' < s[i]) {
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return 0;
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}
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}
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return 1;
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}
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/*
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* Read from serial, when we have a packet write it to tun. No output
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* buffering, input buffered by stdio.
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*/
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void serial_to_tun(FILE * inslip, int outfd)
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{
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static union {
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unsigned char inbuf[2000];
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} uip;
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static int inbufptr = 0;
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int ret;
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unsigned char c;
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#ifdef linux
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ret = fread(&c, 1, 1, inslip);
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if (ret == -1 || ret == 0)
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err(1, "serial_to_tun: read");
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goto after_fread;
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#endif
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read_more:
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if (inbufptr >= sizeof(uip.inbuf)) {
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inbufptr = 0;
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}
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ret = fread(&c, 1, 1, inslip);
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#ifdef linux
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after_fread:
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#endif
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if (ret == -1) {
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err(1, "serial_to_tun: read");
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}
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if (ret == 0) {
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clearerr(inslip);
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return;
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fprintf(stderr, "serial_to_tun: EOF\n");
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exit(1);
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}
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/* fprintf(stderr, "."); */
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switch (c) {
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case SLIP_END:
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if (inbufptr > 0) {
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if (uip.inbuf[0] == '!') {
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if (uip.inbuf[1] == 'M') {
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/* Read gateway MAC address and autoconfigure tap0 interface */
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char macs[24];
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int i, pos;
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struct uip_802154_longaddr dev_addr = { {0} }; // Bridge EUI-64.
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for (i = 0, pos = 0; i < 16; i++) {
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macs[pos++] = uip.inbuf[2 + i];
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if ((i & 1) == 1 && i < 14) {
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macs[pos++] = ':';
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}
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}
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macs[pos] = '\0';
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printf("*** Gateway's MAC address: %s\n", macs);
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{
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int addr_bytes[8]; // sscanf requires int instead of 8-bit for hexadecimal variables.
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sscanf(macs, "%2X:%2X:%2X:%2X:%2X:%2X:%2X:%2X",
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&addr_bytes[0],
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&addr_bytes[1],
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&addr_bytes[2],
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&addr_bytes[3],
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&addr_bytes[4],
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&addr_bytes[5],
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&addr_bytes[6],
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&addr_bytes[7]);
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for(i=0;i<8;i++){
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dev_addr.addr[i] = addr_bytes[i];
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}
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}
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////////////////////////////////////////
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/*PRINTF("MAC:\n");
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for (i = 0; i < 8; i++)
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PRINTF("%02X ", dev_addr.addr[i]);
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PRINTF("\n"); */
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////////////////////////////////////////
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// Remember what will be our MAC address (two middle bytes will be elided).
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memcpy(ð_addr, &dev_addr, 3);
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memcpy(ð_addr.addr[3], &dev_addr.addr[5], 3);
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if (autoconf) {
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struct in6_addr ipv6addr;
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dev_addr.addr[0] |= 0x02;
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strtok(ipprefix, "/");
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if (inet_pton(AF_INET6, ipprefix, &ipv6addr) != 1) {
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printf("Invalid IPv6 address.\n");
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exit(1);
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}
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// Copy modified EUI-64 to the last 64 bits of IPv6 address.
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memcpy(&ipv6addr.s6_addr[8], &dev_addr, 8);
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inet_ntop(AF_INET6, &ipv6addr, autoconf_addr, INET6_ADDRSTRLEN); // To string format.
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char *substr = strtok(NULL, "/");
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if (substr != NULL) { // Add the prefix length.
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strcat(autoconf_addr, "/");
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strcat(autoconf_addr, substr);
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}
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ipaddr = autoconf_addr;
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}
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ssystem("ifconfig %s down", tundev);
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strcpy(&macs[9], &macs[15]); // Elide two middle bytes.
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ssystem("ifconfig %s hw ether %s", tundev, macs);
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ssystem("ifconfig %s inet6 up", tundev);
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if(ipaddr){
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ssystem("ifconfig %s inet6 add %s", tundev, ipaddr);
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ssystem("sysctl -w net.ipv6.conf.all.forwarding=1");
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}
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ssystem("ifconfig %s\n", tundev);
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}
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#define DEBUG_LINE_MARKER '\r'
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}
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else if (uip.inbuf[0] == '?') {
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if (uip.inbuf[1] == 'M'
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&& memcmp(ð_addr, ð_addr_null, 6) != 0) {
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/* Send our MAC address and other configuration options. */
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send_mac = 1;
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set_sniffer_mode = 1;
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set_channel = 1;
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}
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}
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else if (uip.inbuf[0] == DEBUG_LINE_MARKER) {
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fwrite(uip.inbuf + 1, inbufptr - 1, 1, stdout);
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}
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else if (is_sensible_string(uip.inbuf, inbufptr)) {
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fwrite(uip.inbuf, inbufptr, 1, stdout);
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}
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else {
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PRINTF("Writing to tun len: %d\n", inbufptr);
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/* print_packet(uip.inbuf, inbufptr); */
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if (write(outfd, uip.inbuf, inbufptr) != inbufptr) {
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err(1, "serial_to_tun: write");
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}
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}
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inbufptr = 0;
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}
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break;
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case SLIP_ESC:
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if (fread(&c, 1, 1, inslip) != 1) {
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clearerr(inslip);
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/* Put ESC back and give up! */
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ungetc(SLIP_ESC, inslip);
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return;
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}
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switch (c) {
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case SLIP_ESC_END:
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c = SLIP_END;
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break;
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case SLIP_ESC_ESC:
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c = SLIP_ESC;
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break;
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}
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/* FALLTHROUGH */
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default:
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uip.inbuf[inbufptr++] = c;
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break;
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}
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goto read_more;
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}
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unsigned char slip_buf[2000];
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int slip_end, slip_begin;
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void slip_send(unsigned char c)
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{
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if (slip_end >= sizeof(slip_buf))
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err(1, "slip_send overflow");
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slip_buf[slip_end] = c;
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slip_end++;
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}
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int slip_empty()
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{
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return slip_end == 0;
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}
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void slip_flushbuf(int fd)
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{
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int n;
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if (slip_empty())
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return;
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n = write(fd, slip_buf + slip_begin, (slip_end - slip_begin));
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if (n == -1 && errno != EAGAIN) {
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err(1, "slip_flushbuf write failed");
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}
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else if (n == -1) {
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PROGRESS("Q"); /* Outqueueis full! */
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}
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else {
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slip_begin += n;
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if (slip_begin == slip_end) {
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slip_begin = slip_end = 0;
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}
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}
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}
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void write_to_serial(void *inbuf, int len)
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{
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u_int8_t *p = inbuf;
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int i;
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/* printf("Got packet of length %d - write SLIP\n", len); */
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/* print_packet(p, len); */
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/* It would be ``nice'' to send a SLIP_END here but it's not
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* really necessary.
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*/
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/* slip_send(outfd, SLIP_END); */
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PRINTF("Writing to serial len: %d\n", len);
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for (i = 0; i < len; i++) {
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switch (p[i]) {
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case SLIP_END:
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slip_send(SLIP_ESC);
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slip_send(SLIP_ESC_END);
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break;
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case SLIP_ESC:
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slip_send(SLIP_ESC);
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slip_send(SLIP_ESC_ESC);
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break;
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default:
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slip_send(p[i]);
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break;
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}
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}
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slip_send(SLIP_END);
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PROGRESS("t");
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}
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/*
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* Read from tun, write to slip.
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*/
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void tun_to_serial(int infd, int outfd)
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{
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struct {
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unsigned char inbuf[2000];
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} uip;
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int size;
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if ((size = read(infd, uip.inbuf, 2000)) == -1)
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err(1, "tun_to_serial: read");
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write_to_serial(uip.inbuf, size);
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}
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#ifndef BAUDRATE
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#define BAUDRATE B115200
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#endif
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speed_t b_rate = BAUDRATE;
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void stty_telos(int fd)
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{
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struct termios tty;
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speed_t speed = b_rate;
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int i;
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if (tcflush(fd, TCIOFLUSH) == -1)
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err(1, "tcflush");
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if (tcgetattr(fd, &tty) == -1)
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err(1, "tcgetattr");
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cfmakeraw(&tty);
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/* Nonblocking read. */
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tty.c_cc[VTIME] = 0;
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tty.c_cc[VMIN] = 0;
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tty.c_cflag &= ~CRTSCTS;
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tty.c_cflag &= ~HUPCL;
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tty.c_cflag &= ~CLOCAL;
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cfsetispeed(&tty, speed);
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cfsetospeed(&tty, speed);
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if (tcsetattr(fd, TCSAFLUSH, &tty) == -1)
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err(1, "tcsetattr");
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#if 1
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/* Nonblocking read and write. */
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/* if(fcntl(fd, F_SETFL, O_NONBLOCK) == -1) err(1, "fcntl"); */
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tty.c_cflag |= CLOCAL;
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if (tcsetattr(fd, TCSAFLUSH, &tty) == -1)
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err(1, "tcsetattr");
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i = TIOCM_DTR;
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if (ioctl(fd, TIOCMBIS, &i) == -1)
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err(1, "ioctl");
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#endif
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usleep(10 * 1000); /* Wait for hardware 10ms. */
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/* Flush input and output buffers. */
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if (tcflush(fd, TCIOFLUSH) == -1)
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err(1, "tcflush");
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}
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int devopen(const char *dev, int flags)
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{
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char t[32];
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strcpy(t, "/dev/");
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strcat(t, dev);
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return open(t, flags);
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}
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|
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#ifdef linux
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#include <linux/if.h>
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#include <linux/if_tun.h>
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|
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int tun_alloc(char *dev)
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{
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struct ifreq ifr;
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int fd, err;
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|
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if ((fd = open("/dev/net/tun", O_RDWR)) < 0)
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return -1;
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memset(&ifr, 0, sizeof(ifr));
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|
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/* Flags: IFF_TUN - TUN device (no Ethernet headers)
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* IFF_TAP - TAP device
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*
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* IFF_NO_PI - Do not provide packet information
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*/
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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if (*dev != 0)
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strncpy(ifr.ifr_name, dev, IFNAMSIZ);
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|
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if ((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0) {
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close(fd);
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return err;
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}
|
|
strcpy(dev, ifr.ifr_name);
|
|
return fd;
|
|
}
|
|
#else
|
|
int tun_alloc(char *dev)
|
|
{
|
|
return devopen(dev, O_RDWR);
|
|
}
|
|
#endif
|
|
|
|
|
|
void cleanup(void)
|
|
{
|
|
ssystem("ifconfig %s down", tundev);
|
|
if(ipaddr){
|
|
ssystem("sysctl -w net.ipv6.conf.all.forwarding=0");
|
|
}
|
|
}
|
|
|
|
void sigcleanup(int signo)
|
|
{
|
|
fprintf(stderr, "signal %d\n", signo);
|
|
exit(0); /* exit(0) will call cleanup() */
|
|
}
|
|
|
|
|
|
static int request_mac;
|
|
static int send_mac;
|
|
|
|
void send_commands(void)
|
|
{
|
|
char buf[3];
|
|
|
|
if (request_mac) {
|
|
slip_send('?');
|
|
slip_send('M');
|
|
slip_send(SLIP_END);
|
|
|
|
request_mac = 0;
|
|
}
|
|
/* Send our mac to the device. If it knows our address, it is not needed to change
|
|
the MAC address of our local interface (this can be also unsupported, especially under
|
|
Windows).
|
|
*/
|
|
else if(send_mac && memcmp(ð_addr, ð_addr_null, 6) != 0
|
|
&& slip_empty()){
|
|
short i;
|
|
PRINTF("Sending our MAC.\n");
|
|
|
|
slip_send('!');
|
|
slip_send('M');
|
|
|
|
for(i=0; i < 6; i++){
|
|
sprintf(buf,"%02X",eth_addr.addr[i]);
|
|
slip_send(buf[0]);
|
|
slip_send(buf[1]);
|
|
}
|
|
slip_send(SLIP_END);
|
|
|
|
send_mac = 0;
|
|
}
|
|
else if(set_sniffer_mode && slip_empty()){
|
|
|
|
PRINTF("Setting sniffer mode to %d.\n", sniffer_mode);
|
|
|
|
slip_send('!');
|
|
slip_send('O');
|
|
slip_send('S');
|
|
|
|
if(sniffer_mode){
|
|
slip_send('1');
|
|
}
|
|
else {
|
|
slip_send('0');
|
|
}
|
|
slip_send(SLIP_END);
|
|
|
|
set_sniffer_mode = 0;
|
|
|
|
}
|
|
else if(set_channel && slip_empty()){
|
|
|
|
if(channel != 0){
|
|
PRINTF("Setting channel %02d.\n", channel);
|
|
|
|
slip_send('!');
|
|
slip_send('O');
|
|
slip_send('C');
|
|
|
|
sprintf(buf,"%02d",channel);
|
|
slip_send(buf[0]);
|
|
slip_send(buf[1]);
|
|
|
|
slip_send(SLIP_END);
|
|
}
|
|
|
|
set_channel = 0;
|
|
|
|
}
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int c;
|
|
int tunfd, slipfd, maxfd;
|
|
int ret;
|
|
fd_set rset, wset;
|
|
FILE *inslip;
|
|
const char *siodev = NULL;
|
|
int baudrate = -2;
|
|
|
|
setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
|
|
|
|
while ((c = getopt(argc, argv, "B:D:hs:c:rt:a:p:v")) != -1) {
|
|
switch (c) {
|
|
case 'B':
|
|
baudrate = atoi(optarg);
|
|
break;
|
|
|
|
case 's':
|
|
if (strncmp("/dev/", optarg, 5) == 0) {
|
|
siodev = optarg + 5;
|
|
}
|
|
else {
|
|
siodev = optarg;
|
|
}
|
|
break;
|
|
|
|
case 't':
|
|
if (strncmp("/dev/", optarg, 5) == 0) {
|
|
strcpy(tundev, optarg + 5);
|
|
}
|
|
else {
|
|
strcpy(tundev, optarg);
|
|
}
|
|
break;
|
|
|
|
case 'c':
|
|
channel = atoi(optarg);
|
|
set_channel = 1;
|
|
break;
|
|
case 'r':
|
|
sniffer_mode = 1;
|
|
break;
|
|
|
|
case 'a':
|
|
if (autoconf == true) {
|
|
errx(1, USAGE_STRING);
|
|
}
|
|
ipaddr = optarg;
|
|
break;
|
|
|
|
case 'p':
|
|
if (ipaddr != NULL) {
|
|
errx(1, USAGE_STRING);
|
|
}
|
|
autoconf = true;
|
|
ipprefix = optarg;
|
|
break;
|
|
|
|
case 'v':
|
|
verbose = true;
|
|
break;
|
|
|
|
case '?':
|
|
case 'h':
|
|
default:
|
|
errx(1, HELP_STRING);
|
|
break;
|
|
}
|
|
}
|
|
#if 0
|
|
argc -= (optind - 1);
|
|
argv += (optind - 1);
|
|
|
|
//if(argc != 3 && argc != 4) {
|
|
//if (autoconf == false && ipaddr == NULL ) {
|
|
errx(1, USAGE_STRING);
|
|
}
|
|
#endif
|
|
|
|
|
|
switch (baudrate) {
|
|
case -2:
|
|
break; /* Use default. */
|
|
case 9600:
|
|
b_rate = B9600;
|
|
break;
|
|
case 19200:
|
|
b_rate = B19200;
|
|
break;
|
|
case 38400:
|
|
b_rate = B38400;
|
|
break;
|
|
case 57600:
|
|
b_rate = B57600;
|
|
break;
|
|
case 115200:
|
|
b_rate = B115200;
|
|
break;
|
|
default:
|
|
err(1, "unknown baudrate %d", baudrate);
|
|
break;
|
|
}
|
|
|
|
|
|
if (siodev != NULL) {
|
|
slipfd = devopen(siodev, O_RDWR | O_NONBLOCK);
|
|
if (slipfd == -1) {
|
|
err(1, "can't open siodev ``/dev/%s''", siodev);
|
|
}
|
|
}
|
|
else {
|
|
static const char *siodevs[] = {
|
|
"ttyUSB0", "cuaU0", "ucom0" /* linux, fbsd6, fbsd5 */
|
|
};
|
|
int i;
|
|
for (i = 0; i < 3; i++) {
|
|
siodev = siodevs[i];
|
|
slipfd = devopen(siodev, O_RDWR | O_NONBLOCK);
|
|
if (slipfd != -1)
|
|
break;
|
|
}
|
|
if (slipfd == -1) {
|
|
err(1, "can't open siodev");
|
|
}
|
|
}
|
|
fprintf(stderr, "slip started on ``/dev/%s''\n", siodev);
|
|
stty_telos(slipfd);
|
|
slip_send(SLIP_END);
|
|
inslip = fdopen(slipfd, "r");
|
|
if (inslip == NULL)
|
|
err(1, "main: fdopen");
|
|
|
|
tunfd = tun_alloc(tundev);
|
|
printf("opening: %s\n", tundev);
|
|
if (tunfd == -1)
|
|
err(1, "main: open");
|
|
fprintf(stderr, "opened device ``/dev/%s''\n", tundev);
|
|
|
|
atexit(cleanup);
|
|
signal(SIGHUP, sigcleanup);
|
|
signal(SIGTERM, sigcleanup);
|
|
signal(SIGINT, sigcleanup);
|
|
|
|
|
|
|
|
while (1) {
|
|
maxfd = 0;
|
|
FD_ZERO(&rset);
|
|
FD_ZERO(&wset);
|
|
|
|
send_commands();
|
|
|
|
if (!slip_empty()) { /* Anything to flush? */
|
|
FD_SET(slipfd, &wset);
|
|
}
|
|
|
|
FD_SET(slipfd, &rset); /* Read from slip ASAP! */
|
|
if (slipfd > maxfd)
|
|
maxfd = slipfd;
|
|
|
|
/* We only have one packet at a time queued for slip output. */
|
|
if (slip_empty()) {
|
|
FD_SET(tunfd, &rset);
|
|
if (tunfd > maxfd)
|
|
maxfd = tunfd;
|
|
}
|
|
|
|
ret = select(maxfd + 1, &rset, &wset, NULL, NULL);
|
|
if (ret == -1 && errno != EINTR) {
|
|
err(1, "select");
|
|
}
|
|
else if (ret > 0) {
|
|
if (FD_ISSET(slipfd, &rset)) {
|
|
serial_to_tun(inslip, tunfd);
|
|
}
|
|
|
|
if (FD_ISSET(slipfd, &wset)) {
|
|
slip_flushbuf(slipfd);
|
|
}
|
|
|
|
if (slip_empty() && FD_ISSET(tunfd, &rset)) {
|
|
tun_to_serial(tunfd, slipfd);
|
|
slip_flushbuf(slipfd);
|
|
}
|
|
}
|
|
}
|
|
}
|