650 lines
14 KiB
C
650 lines
14 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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*
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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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in_addr_t giaddr;
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in_addr_t netaddr;
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in_addr_t circuit_addr;
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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(int outfd, void *inbuf, int len);
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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] ipaddress netmask"
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char tundev[32] = { "tap0" };
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int
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ssystem(const char *fmt, ...) __attribute__((__format__ (__printf__, 1, 2)));
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int
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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
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print_packet(u_int8_t *p, int len) {
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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
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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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} 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
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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) 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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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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ssystem("ifconfig %s down", tundev);
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ssystem("ifconfig %s hw ether %s", tundev, &macs[6]);
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ssystem("ifconfig %s up", tundev);
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}
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#define DEBUG_LINE_MARKER '\r'
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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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} else if(is_sensible_string(uip.inbuf, inbufptr)) {
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fwrite(uip.inbuf, inbufptr, 1, stdout);
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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
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slip_send(int fd, 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
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slip_empty()
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{
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return slip_end == 0;
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}
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void
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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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} else if(n == -1) {
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PROGRESS("Q"); /* Outqueueis full! */
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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
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write_to_serial(int outfd, void *inbuf, int len)
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{
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u_int8_t *p = inbuf;
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int i, ecode;
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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 packet to serial!!! %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(outfd, SLIP_ESC);
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slip_send(outfd, SLIP_ESC_END);
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break;
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case SLIP_ESC:
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slip_send(outfd, SLIP_ESC);
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slip_send(outfd, SLIP_ESC_ESC);
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break;
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default:
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slip_send(outfd, p[i]);
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break;
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}
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}
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slip_send(outfd, 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
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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) err(1, "tun_to_serial: read");
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write_to_serial(outfd, 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
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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) err(1, "tcflush");
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if(tcgetattr(fd, &tty) == -1) 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) 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) err(1, "tcsetattr");
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i = TIOCM_DTR;
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if(ioctl(fd, TIOCMBIS, &i) == -1) 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) err(1, "tcflush");
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}
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int
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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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#ifdef linux
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#include <linux/if.h>
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#include <linux/if_tun.h>
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int
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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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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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/* 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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if((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){
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close(fd);
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return err;
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}
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strcpy(dev, ifr.ifr_name);
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return fd;
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}
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#else
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int
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tun_alloc(char *dev)
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{
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return devopen(dev, O_RDWR);
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}
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#endif
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const char *ipaddr;
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const char *netmask;
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void
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cleanup(void)
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{
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ssystem("ifconfig %s down", tundev);
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#ifndef linux
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ssystem("sysctl -w net.ipv6.conf.all.forwarding=1");
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#endif
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/* ssystem("arp -d %s", ipaddr); */
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ssystem("netstat -nr"
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" | awk '{ if ($2 == \"%s\") print \"route delete -net \"$1; }'"
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" | sh",
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tundev);
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}
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void
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sigcleanup(int signo)
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{
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fprintf(stderr, "signal %d\n", signo);
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exit(0); /* exit(0) will call cleanup() */
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}
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static int got_sigalarm;
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static int request_mac;
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void
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sigalarm(int signo)
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{
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got_sigalarm = 1;
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return;
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}
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void
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sigalarm_reset()
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{
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#ifdef linux
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#define TIMEOUT (997*1000)
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#else
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#define TIMEOUT (2451*1000)
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#endif
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ualarm(TIMEOUT, TIMEOUT);
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got_sigalarm = 0;
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}
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void
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ifconf(const char *tundev, const char *ipaddr, const char *netmask)
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{
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struct in_addr netname;
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netname.s_addr = inet_addr(ipaddr) & inet_addr(netmask);
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#ifdef linux
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ssystem("ifconfig %s inet `hostname` up", tundev);
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if(strcmp(ipaddr, "0.0.0.0") != 0) {
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ssystem("route add -net %s netmask %s dev %s",
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inet_ntoa(netname), netmask, tundev);
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}
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#else
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ssystem("ifconfig %s inet `hostname` %s up", tundev, ipaddr);
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if(strcmp(ipaddr, "0.0.0.0") != 0) {
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ssystem("route add -net %s -netmask %s -interface %s",
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inet_ntoa(netname), netmask, tundev);
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}
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ssystem("sysctl -w net.inet.ip.forwarding=1");
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#endif /* !linux */
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ssystem("ifconfig %s\n", tundev);
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}
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int
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main(int argc, char **argv)
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{
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int c;
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int tunfd, slipfd, maxfd;
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int ret;
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fd_set rset, wset;
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FILE *inslip;
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const char *siodev = NULL;
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int baudrate = -2;
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request_mac = 1;
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setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
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while((c = getopt(argc, argv, "B:D:hs:t:")) != -1) {
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switch (c) {
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case 'B':
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baudrate = atoi(optarg);
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break;
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case 's':
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if(strncmp("/dev/", optarg, 5) == 0) {
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siodev = optarg + 5;
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} else {
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siodev = optarg;
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}
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break;
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case 't':
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if(strncmp("/dev/", optarg, 5) == 0) {
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strcpy(tundev, optarg + 5);
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} else {
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strcpy(tundev, optarg);
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}
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break;
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case '?':
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case 'h':
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default:
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errx(1, USAGE_STRING);
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break;
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}
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}
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argc -= (optind - 1);
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argv += (optind - 1);
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if(argc != 3 && argc != 4) {
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errx(1, USAGE_STRING);
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}
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ipaddr = argv[1];
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netmask = argv[2];
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circuit_addr = inet_addr(ipaddr);
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netaddr = inet_addr(ipaddr) & inet_addr(netmask);
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switch(baudrate) {
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case -2:
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break; /* Use default. */
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case 9600:
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b_rate = B9600;
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break;
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case 19200:
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b_rate = B19200;
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break;
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case 38400:
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b_rate = B38400;
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break;
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case 57600:
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b_rate = B57600;
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break;
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case 115200:
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b_rate = B115200;
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break;
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default:
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err(1, "unknown baudrate %d", baudrate);
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break;
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}
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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(slipfd, SLIP_END);
|
|
inslip = fdopen(slipfd, "r");
|
|
if(inslip == NULL) err(1, "main: fdopen");
|
|
|
|
tunfd = tun_alloc(tundev);
|
|
printf("opening: %s", 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);
|
|
signal(SIGALRM, sigalarm);
|
|
ifconf(tundev, ipaddr, netmask);
|
|
|
|
while(1) {
|
|
maxfd = 0;
|
|
FD_ZERO(&rset);
|
|
FD_ZERO(&wset);
|
|
|
|
/* request mac address from gateway node for autoconfiguration of
|
|
ethernet interface tap0 */
|
|
if (request_mac) {
|
|
slip_send(slipfd, '?');
|
|
slip_send(slipfd, 'M');
|
|
slip_send(slipfd, SLIP_END);
|
|
request_mac = 0;
|
|
}
|
|
|
|
if(got_sigalarm) {
|
|
/* Send "?IPA". */
|
|
slip_send(slipfd, '?');
|
|
slip_send(slipfd, 'I');
|
|
slip_send(slipfd, 'P');
|
|
slip_send(slipfd, 'A');
|
|
slip_send(slipfd, SLIP_END);
|
|
got_sigalarm = 0;
|
|
}
|
|
|
|
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);
|
|
sigalarm_reset();
|
|
}
|
|
|
|
if(slip_empty() && FD_ISSET(tunfd, &rset)) {
|
|
tun_to_serial(tunfd, slipfd);
|
|
slip_flushbuf(slipfd);
|
|
sigalarm_reset();
|
|
}
|
|
}
|
|
}
|
|
}
|