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osd-contiki/tools/tunslip6.c
David Kopf 93097dcc0a Minor tweaks based on maniacbug commits.
2011-08-16 14:25:16 -04:00

908 lines
22 KiB
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/*
* Copyright (c) 2001, Adam Dunkels.
* Copyright (c) 2009, 2010 Joakim Eriksson, Niclas Finne, Dogan Yazar.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This file is part of the uIP TCP/IP stack.
*
* $Id: tunslip6.c,v 1.6 2010/11/29 18:14:54 joxe Exp $
*
*/
/* Below define allows importing saved output into Wireshark as "Raw IP" packet type */
#define WIRESHARK_IMPORT_FORMAT 1
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <err.h>
int verbose = 1;
const char *ipaddr;
const char *netmask;
int slipfd = 0;
uint16_t basedelay=0,delaymsec=0;
uint32_t startsec,startmsec,delaystartsec,delaystartmsec;
int timestamp = 0, flowcontrol=0;
int ssystem(const char *fmt, ...)
__attribute__((__format__ (__printf__, 1, 2)));
void write_to_serial(int outfd, void *inbuf, int len);
void slip_send(int fd, unsigned char c);
void slip_send_char(int fd, unsigned char c);
//#define PROGRESS(s) fprintf(stderr, s)
#define PROGRESS(s) do { } while (0)
char tundev[32] = { "" };
int
ssystem(const char *fmt, ...) __attribute__((__format__ (__printf__, 1, 2)));
int
ssystem(const char *fmt, ...)
{
char cmd[128];
va_list ap;
va_start(ap, fmt);
vsnprintf(cmd, sizeof(cmd), fmt, ap);
va_end(ap);
printf("%s\n", cmd);
fflush(stdout);
return system(cmd);
}
#define SLIP_END 0300
#define SLIP_ESC 0333
#define SLIP_ESC_END 0334
#define SLIP_ESC_ESC 0335
/* get sockaddr, IPv4 or IPv6: */
void *
get_in_addr(struct sockaddr *sa)
{
if(sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
void
stamptime(void)
{
static long startsecs=0,startmsecs=0;
long secs,msecs;
struct timeval tv;
time_t t;
struct tm *tmp;
char timec[20];
gettimeofday(&tv, NULL) ;
msecs=tv.tv_usec/1000;
secs=tv.tv_sec;
if (startsecs) {
secs -=startsecs;
msecs-=startmsecs;
if (msecs<0) {secs--;msecs+=1000;}
fprintf(stderr,"%04lu.%03lu ", secs, msecs);
} else {
startsecs=secs;
startmsecs=msecs;
t=time(NULL);
tmp=localtime(&t);
strftime(timec,sizeof(timec),"%T",tmp);
// fprintf(stderr,"\n%s.%03lu ",timec,msecs);
fprintf(stderr,"\n%s ",timec);
}
}
int
is_sensible_string(const unsigned char *s, int len)
{
int i;
for(i = 1; i < len; i++) {
if(s[i] == 0 || s[i] == '\r' || s[i] == '\n' || s[i] == '\t') {
continue;
} else if(s[i] < ' ' || '~' < s[i]) {
return 0;
}
}
return 1;
}
/*
* Read from serial, when we have a packet write it to tun. No output
* buffering, input buffered by stdio.
*/
void
serial_to_tun(FILE *inslip, int outfd)
{
static union {
unsigned char inbuf[2000];
} uip;
static int inbufptr = 0;
int ret,i;
unsigned char c;
#ifdef linux
ret = fread(&c, 1, 1, inslip);
if(ret == -1 || ret == 0) err(1, "serial_to_tun: read");
goto after_fread;
#endif
read_more:
if(inbufptr >= sizeof(uip.inbuf)) {
if(timestamp) stamptime();
fprintf(stderr, "*** dropping large %d byte packet\n",inbufptr);
inbufptr = 0;
}
ret = fread(&c, 1, 1, inslip);
#ifdef linux
after_fread:
#endif
if(ret == -1) {
err(1, "serial_to_tun: read");
}
if(ret == 0) {
clearerr(inslip);
return;
}
/* fprintf(stderr, ".");*/
switch(c) {
case SLIP_END:
if(inbufptr > 0) {
if(uip.inbuf[0] == '!') {
if(uip.inbuf[1] == 'M') {
/* Read gateway MAC address and autoconfigure tap0 interface */
char macs[24];
int i, pos;
for(i = 0, pos = 0; i < 16; i++) {
macs[pos++] = uip.inbuf[2 + i];
if((i & 1) == 1 && i < 14) {
macs[pos++] = ':';
}
}
if(timestamp) stamptime();
macs[pos] = '\0';
// printf("*** Gateway's MAC address: %s\n", macs);
fprintf(stderr,"*** Gateway's MAC address: %s\n", macs);
if (timestamp) stamptime();
ssystem("ifconfig %s down", tundev);
if (timestamp) stamptime();
ssystem("ifconfig %s hw ether %s", tundev, &macs[6]);
if (timestamp) stamptime();
ssystem("ifconfig %s up", tundev);
}
} else if(uip.inbuf[0] == '?') {
if(uip.inbuf[1] == 'P') {
/* Prefix info requested */
struct in6_addr addr;
int i;
char *s = strchr(ipaddr, '/');
if(s != NULL) {
*s = '\0';
}
inet_pton(AF_INET6, ipaddr, &addr);
if(timestamp) stamptime();
fprintf(stderr,"*** Address:%s => %02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
// printf("*** Address:%s => %02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
ipaddr,
addr.s6_addr[0], addr.s6_addr[1],
addr.s6_addr[2], addr.s6_addr[3],
addr.s6_addr[4], addr.s6_addr[5],
addr.s6_addr[6], addr.s6_addr[7]);
slip_send(slipfd, '!');
slip_send(slipfd, 'P');
for(i = 0; i < 8; i++) {
/* need to call the slip_send_char for stuffing */
slip_send_char(slipfd, addr.s6_addr[i]);
}
slip_send(slipfd, SLIP_END);
}
#define DEBUG_LINE_MARKER '\r'
} else if(uip.inbuf[0] == DEBUG_LINE_MARKER) {
fwrite(uip.inbuf + 1, inbufptr - 1, 1, stdout);
} else if(is_sensible_string(uip.inbuf, inbufptr)) {
if(verbose==1) { /* strings already echoed below for verbose>1 */
if (timestamp) stamptime();
fwrite(uip.inbuf, inbufptr, 1, stdout);
}
} else {
if(verbose>2) {
if (timestamp) stamptime();
printf("Packet from SLIP of length %d - write TUN\n", inbufptr);
if (verbose>4) {
#if WIRESHARK_IMPORT_FORMAT
printf("0000");
for(i = 0; i < inbufptr; i++) printf(" %02x",uip.inbuf[i]);
#else
printf(" ");
for(i = 0; i < inbufptr; i++) {
printf("%02x", uip.inbuf[i]);
if((i & 3) == 3) printf(" ");
if((i & 15) == 15) printf("\n ");
}
#endif
printf("\n");
}
}
if(write(outfd, uip.inbuf, inbufptr) != inbufptr) {
err(1, "serial_to_tun: write");
}
}
inbufptr = 0;
}
break;
case SLIP_ESC:
if(fread(&c, 1, 1, inslip) != 1) {
clearerr(inslip);
/* Put ESC back and give up! */
ungetc(SLIP_ESC, inslip);
return;
}
switch(c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
}
/* FALLTHROUGH */
default:
uip.inbuf[inbufptr++] = c;
/* Echo lines as they are received for verbose=2,3,5+ */
/* Echo all printable characters for verbose==4 */
if((verbose==2) || (verbose==3) || (verbose>4)) {
if(c=='\n') {
if(is_sensible_string(uip.inbuf, inbufptr)) {
if (timestamp) stamptime();
fwrite(uip.inbuf, inbufptr, 1, stdout);
inbufptr=0;
}
}
} else if(verbose==4) {
if(c == 0 || c == '\r' || c == '\n' || c == '\t' || (c >= ' ' && c <= '~')) {
fwrite(&c, 1, 1, stdout);
if(c=='\n') if(timestamp) stamptime();
}
}
break;
}
goto read_more;
}
unsigned char slip_buf[2000];
int slip_end, slip_begin;
void
slip_send_char(int fd, unsigned char c)
{
switch(c) {
case SLIP_END:
slip_send(fd, SLIP_ESC);
slip_send(fd, SLIP_ESC_END);
break;
case SLIP_ESC:
slip_send(fd, SLIP_ESC);
slip_send(fd, SLIP_ESC_ESC);
break;
default:
slip_send(fd, c);
break;
}
}
void
slip_send(int fd, unsigned char c)
{
if(slip_end >= sizeof(slip_buf)) {
err(1, "slip_send overflow");
}
slip_buf[slip_end] = c;
slip_end++;
}
int
slip_empty()
{
return slip_end == 0;
}
void
slip_flushbuf(int fd)
{
int n;
if(slip_empty()) {
return;
}
n = write(fd, slip_buf + slip_begin, (slip_end - slip_begin));
if(n == -1 && errno != EAGAIN) {
err(1, "slip_flushbuf write failed");
} else if(n == -1) {
PROGRESS("Q"); /* Outqueueis full! */
} else {
slip_begin += n;
if(slip_begin == slip_end) {
slip_begin = slip_end = 0;
}
}
}
void
write_to_serial(int outfd, void *inbuf, int len)
{
u_int8_t *p = inbuf;
int i;
if(verbose>2) {
if (timestamp) stamptime();
printf("Packet from TUN of length %d - write SLIP\n", len);
if (verbose>4) {
#if WIRESHARK_IMPORT_FORMAT
printf("0000");
for(i = 0; i < len; i++) printf(" %02x", p[i]);
#else
printf(" ");
for(i = 0; i < len; i++) {
printf("%02x", p[i]);
if((i & 3) == 3) printf(" ");
if((i & 15) == 15) printf("\n ");
}
#endif
printf("\n");
}
}
/* It would be ``nice'' to send a SLIP_END here but it's not
* really necessary.
*/
/* slip_send(outfd, SLIP_END); */
for(i = 0; i < len; i++) {
switch(p[i]) {
case SLIP_END:
slip_send(outfd, SLIP_ESC);
slip_send(outfd, SLIP_ESC_END);
break;
case SLIP_ESC:
slip_send(outfd, SLIP_ESC);
slip_send(outfd, SLIP_ESC_ESC);
break;
default:
slip_send(outfd, p[i]);
break;
}
}
slip_send(outfd, SLIP_END);
PROGRESS("t");
}
/*
* Read from tun, write to slip.
*/
int
tun_to_serial(int infd, int outfd)
{
struct {
unsigned char inbuf[2000];
} uip;
int size;
if((size = read(infd, uip.inbuf, 2000)) == -1) err(1, "tun_to_serial: read");
write_to_serial(outfd, uip.inbuf, size);
return size;
}
#ifndef BAUDRATE
#define BAUDRATE B115200
#endif
speed_t b_rate = BAUDRATE;
void
stty_telos(int fd)
{
struct termios tty;
speed_t speed = b_rate;
int i;
if(tcflush(fd, TCIOFLUSH) == -1) err(1, "tcflush");
if(tcgetattr(fd, &tty) == -1) err(1, "tcgetattr");
cfmakeraw(&tty);
/* Nonblocking read. */
tty.c_cc[VTIME] = 0;
tty.c_cc[VMIN] = 0;
if (flowcontrol)
tty.c_cflag |= CRTSCTS;
else
tty.c_cflag &= ~CRTSCTS;
tty.c_cflag &= ~HUPCL;
tty.c_cflag &= ~CLOCAL;
cfsetispeed(&tty, speed);
cfsetospeed(&tty, speed);
if(tcsetattr(fd, TCSAFLUSH, &tty) == -1) err(1, "tcsetattr");
#if 1
/* Nonblocking read and write. */
/* if(fcntl(fd, F_SETFL, O_NONBLOCK) == -1) err(1, "fcntl"); */
tty.c_cflag |= CLOCAL;
if(tcsetattr(fd, TCSAFLUSH, &tty) == -1) err(1, "tcsetattr");
i = TIOCM_DTR;
if(ioctl(fd, TIOCMBIS, &i) == -1) err(1, "ioctl");
#endif
usleep(10*1000); /* Wait for hardware 10ms. */
/* Flush input and output buffers. */
if(tcflush(fd, TCIOFLUSH) == -1) err(1, "tcflush");
}
int
devopen(const char *dev, int flags)
{
char t[32];
strcpy(t, "/dev/");
strncat(t, dev, sizeof(t) - 5);
return open(t, flags);
}
#ifdef linux
#include <linux/if.h>
#include <linux/if_tun.h>
int
tun_alloc(char *dev, int tap)
{
struct ifreq ifr;
int fd, err;
if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) {
return -1;
}
memset(&ifr, 0, sizeof(ifr));
/* Flags: IFF_TUN - TUN device (no Ethernet headers)
* IFF_TAP - TAP device
*
* IFF_NO_PI - Do not provide packet information
*/
ifr.ifr_flags = (tap ? IFF_TAP : IFF_TUN) | IFF_NO_PI;
if(*dev != 0)
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ) {
close(fd);
return err;
}
strcpy(dev, ifr.ifr_name);
return fd;
}
#else
int
tun_alloc(char *dev, int tap)
{
return devopen(dev, O_RDWR);
}
#endif
void
cleanup(void)
{
if (timestamp) stamptime();
ssystem("ifconfig %s down", tundev);
#ifndef linux
ssystem("sysctl -w net.ipv6.conf.all.forwarding=1");
#endif
/* ssystem("arp -d %s", ipaddr); */
if (timestamp) stamptime();
ssystem("netstat -nr"
" | awk '{ if ($2 == \"%s\") print \"route delete -net \"$1; }'"
" | sh",
tundev);
}
void
sigcleanup(int signo)
{
fprintf(stderr, "signal %d\n", signo);
exit(0); /* exit(0) will call cleanup() */
}
static int got_sigalarm;
void
sigalarm(int signo)
{
got_sigalarm = 1;
return;
}
void
sigalarm_reset()
{
#ifdef linux
#define TIMEOUT (997*1000)
#else
#define TIMEOUT (2451*1000)
#endif
ualarm(TIMEOUT, TIMEOUT);
got_sigalarm = 0;
}
void
ifconf(const char *tundev, const char *ipaddr)
{
#ifdef linux
if (timestamp) stamptime();
ssystem("ifconfig %s inet `hostname` up", tundev);
if (timestamp) stamptime();
ssystem("ifconfig %s add %s", tundev, ipaddr);
#else
if (timestamp) stamptime();
ssystem("ifconfig %s inet `hostname` %s up", tundev, ipaddr);
if (timestamp) stamptime();
ssystem("sysctl -w net.inet.ip.forwarding=1");
#endif /* !linux */
if (timestamp) stamptime();
ssystem("ifconfig %s\n", tundev);
}
int
main(int argc, char **argv)
{
int c;
int tunfd, maxfd;
int ret;
fd_set rset, wset;
FILE *inslip;
const char *siodev = NULL;
const char *host = NULL;
const char *port = NULL;
const char *prog;
int baudrate = -2;
int tap = 0;
slipfd = 0;
prog = argv[0];
setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
while((c = getopt(argc, argv, "B:H:D:Lhs:t:v::d::a:p:T")) != -1) {
switch(c) {
case 'B':
baudrate = atoi(optarg);
break;
case 'H':
flowcontrol=1;
break;
case 'L':
timestamp=1;
break;
case 's':
if(strncmp("/dev/", optarg, 5) == 0) {
siodev = optarg + 5;
} else {
siodev = optarg;
}
break;
case 't':
if(strncmp("/dev/", optarg, 5) == 0) {
strncpy(tundev, optarg + 5, sizeof(tundev));
} else {
strncpy(tundev, optarg, sizeof(tundev));
}
break;
case 'a':
host = optarg;
break;
case 'p':
port = optarg;
break;
case 'd':
basedelay = 10;
if (optarg) basedelay = atoi(optarg);
break;
case 'v':
verbose = 2;
if (optarg) verbose = atoi(optarg);
break;
case 'T':
tap = 1;
break;
case '?':
case 'h':
default:
fprintf(stderr,"usage: %s [options] ipaddress\n", prog);
fprintf(stderr,"example: tunslip6 -L -v2 -s ttyUSB1 aaaa::1/64\n");
fprintf(stderr,"Options are:\n");
fprintf(stderr," -B baudrate 9600,19200,38400,57600,115200 (default)\n");
fprintf(stderr," -H Hardware CTS/RTS flow control (default disabled)\n");
fprintf(stderr," -L Log output format (adds time stamps)\n");
fprintf(stderr," -s siodev Serial device (default /dev/ttyUSB0)\n");
fprintf(stderr," -T Make tap interface (default is tun interface)\n");
fprintf(stderr," -t tundev Name of interface (default tap0 or tun0)\n");
fprintf(stderr," -v[level] Verbosity level\n");
fprintf(stderr," -v0 No messages\n");
fprintf(stderr," -v1 Encapsulated SLIP debug messages (default)\n");
fprintf(stderr," -v2 Printable strings after they are received\n");
fprintf(stderr," -v3 Printable strings and SLIP packet notifications\n");
fprintf(stderr," -v4 All printable characters as they are received\n");
fprintf(stderr," -v5 All SLIP packets in hex\n");
fprintf(stderr," -v Equivalent to -v3\n");
fprintf(stderr," -d[basedelay] Minimum delay between outgoing SLIP packets.\n");
fprintf(stderr," Actual delay is basedelay*(#6LowPAN fragments) milliseconds.\n");
fprintf(stderr," -d is equivalent to -d10.\n");
fprintf(stderr," -a serveraddr \n");
fprintf(stderr," -p serverport \n");
exit(1);
break;
}
}
argc -= (optind - 1);
argv += (optind - 1);
if(argc != 2 && argc != 3) {
err(1, "usage: %s [-B baudrate] [-H] [-L] [-s siodev] [-t tundev] [-T] [-v verbosity] [-d delay] [-a serveraddress] [-p serverport] ipaddress", prog);
}
ipaddr = argv[1];
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(*tundev == '\0') {
/* Use default. */
if(tap) {
strcpy(tundev, "tap0");
} else {
strcpy(tundev, "tun0");
}
}
if(host != NULL) {
struct addrinfo hints, *servinfo, *p;
int rv;
char s[INET6_ADDRSTRLEN];
if(port == NULL) {
port = "60001";
}
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if((rv = getaddrinfo(host, port, &hints, &servinfo)) != 0) {
err(1, "getaddrinfo: %s", gai_strerror(rv));
}
/* loop through all the results and connect to the first we can */
for(p = servinfo; p != NULL; p = p->ai_next) {
if((slipfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol)) == -1) {
perror("client: socket");
continue;
}
if(connect(slipfd, p->ai_addr, p->ai_addrlen) == -1) {
close(slipfd);
perror("client: connect");
continue;
}
break;
}
if(p == NULL) {
err(1, "can't connect to ``%s:%s''", host, port);
}
fcntl(slipfd, F_SETFL, O_NONBLOCK);
inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr),
s, sizeof(s));
fprintf(stderr, "slip connected to ``%s:%s''\n", s, port);
/* all done with this structure */
freeaddrinfo(servinfo);
} else {
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");
}
}
if (timestamp) stamptime();
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, tap);
if(tunfd == -1) err(1, "main: open");
if (timestamp) stamptime();
fprintf(stderr, "opened %s device ``/dev/%s''\n",
tap ? "tap" : "tun", tundev);
atexit(cleanup);
signal(SIGHUP, sigcleanup);
signal(SIGTERM, sigcleanup);
signal(SIGINT, sigcleanup);
signal(SIGALRM, sigalarm);
ifconf(tundev, ipaddr);
while(1) {
maxfd = 0;
FD_ZERO(&rset);
FD_ZERO(&wset);
/* do not send IPA all the time... - add get MAC later... */
/* 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();
}
/* Optional delay between outgoing packets */
/* Base delay times number of 6lowpan fragments to be sent */
if(delaymsec) {
struct timeval tv;
int dmsec;
gettimeofday(&tv, NULL) ;
dmsec=(tv.tv_sec-delaystartsec)*1000+tv.tv_usec/1000-delaystartmsec;
if(dmsec<0) delaymsec=0;
if(dmsec>delaymsec) delaymsec=0;
}
if(delaymsec==0) {
int size;
if(slip_empty() && FD_ISSET(tunfd, &rset)) {
size=tun_to_serial(tunfd, slipfd);
slip_flushbuf(slipfd);
sigalarm_reset();
if(basedelay) {
struct timeval tv;
gettimeofday(&tv, NULL) ;
// delaymsec=basedelay*(1+(size/120));//multiply by # of 6lowpan packets?
delaymsec=basedelay;
delaystartsec =tv.tv_sec;
delaystartmsec=tv.tv_usec/1000;
}
}
}
}
}
}
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