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|
/*****************************************************************************/
/*
* kisspkt.c -- (M)KISS & HDLC packet IO.
*
* Copyright (C) 1999-2000
* Thomas Sailer (sailer@ife.ee.ethz.ch)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Please note that the GPL allows you to use the driver, NOT the radio.
* In order to use the radio, you need a license from the communications
* authority of your country.
*
*/
/*****************************************************************************/
#define _GNU_SOURCE
#define _REENTRANT
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* AIX requires this to be the first thing in the file. */
#ifndef __GNUC__
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
#include "soundio.h"
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <termios.h>
#include <stdio.h>
#include <signal.h>
/* glibc2.0 does not have sockaddr_ax25, ifr.ifr_newname and SIOCSIFNAME */
#ifdef HAVE_LINUX_IF_H
#include <linux/if.h>
#endif
#ifdef HAVE_LINUX_AX25_H
#include <linux/ax25.h>
#endif
#ifdef HAVE_LINUX_SOCKIOS_H
#include <linux/sockios.h>
#endif
#ifdef HAVE_MKISS
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_ARP_H
#include <net/if_arp.h>
#endif
#ifdef HAVE_PTY_H
#include <pty.h>
#else
extern int openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp);
#endif
/* ---------------------------------------------------------------------- */
#define KISS_FEND ((unsigned char)0300)
#define KISS_FESC ((unsigned char)0333)
#define KISS_TFEND ((unsigned char)0334)
#define KISS_TFESC ((unsigned char)0335)
#define KISS_CMD_DATA 0
#define KISS_CMD_TXDELAY 1
#define KISS_CMD_PPERSIST 2
#define KISS_CMD_SLOTTIME 3
#define KISS_CMD_TXTAIL 4
#define KISS_CMD_FULLDUP 5
#define KISS_CMD_HARDWARE 6
#define KISS_CMD_FECLEVEL 8
#define KISS_CMD_RETURN 255
/* ---------------------------------------------------------------------- */
/*
* the CRC routines are stolen from WAMPES
* by Dieter Deyke
*/
const u_int16_t crc_ccitt_table[0x100] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
/* ---------------------------------------------------------------------- */
static inline u_int16_t calc_crc_ccitt(const u_int8_t *buffer, int len)
{
u_int16_t crc = 0xffff;
for (;len>0;len--)
crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
crc ^= 0xffff;
return crc;
}
static inline void append_crc_ccitt(u_int8_t *buffer, int len)
{
u_int16_t crc = calc_crc_ccitt(buffer, len);
buffer[len] = crc;
buffer[len+1] = crc >> 8;
}
static inline int check_crc_ccitt(const u_int8_t *buffer, int len)
{
u_int16_t crc = calc_crc_ccitt(buffer, len);
return (crc & 0xffff) == 0x0f47;
}
/* ---------------------------------------------------------------------- */
/*
* high performance HDLC encoder
* yes, it's ugly, but generates pretty good code
*/
#define ENCODEITERA(j) \
do { \
if (!(notbitstream & (0x1f0 << j))) \
goto stuff##j; \
encodeend##j:; \
} while (0)
#define ENCODEITERB(j) \
do { \
stuff##j: \
bitstream &= ~(0x100 << j); \
bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) | \
((bitbuf & ~(((2 << j) << numbit) - 1)) << 1); \
numbit++; \
notbitstream = ~bitstream; \
goto encodeend##j; \
} while (0)
static void hdlc_encode(struct modemchannel *chan, unsigned char *pkt, unsigned int len)
{
unsigned bitstream, notbitstream, bitbuf, numbit;
unsigned wr = chan->pkt.htx.wr;
chan->pkt.stat.pkt_out++;
append_crc_ccitt(pkt, len);
len += 2;
bitstream = 0;
bitbuf = 0x7e;
numbit = 8; /* opening flag */
while (numbit >= 8) {
chan->pkt.htx.buf[wr] = bitbuf;
wr = (wr + 1) % TXBUFFER_SIZE;
if (wr == chan->pkt.htx.rd)
*(int *)0 = 0; /* must not happen! */
bitbuf >>= 8;
numbit -= 8;
}
for (; len > 0; len--, pkt++) {
bitstream >>= 8;
bitstream |= ((unsigned int)*pkt) << 8;
bitbuf |= ((unsigned int)*pkt) << numbit;
notbitstream = ~bitstream;
ENCODEITERA(0);
ENCODEITERA(1);
ENCODEITERA(2);
ENCODEITERA(3);
ENCODEITERA(4);
ENCODEITERA(5);
ENCODEITERA(6);
ENCODEITERA(7);
goto enditer;
ENCODEITERB(0);
ENCODEITERB(1);
ENCODEITERB(2);
ENCODEITERB(3);
ENCODEITERB(4);
ENCODEITERB(5);
ENCODEITERB(6);
ENCODEITERB(7);
enditer:
numbit += 8;
while (numbit >= 8) {
chan->pkt.htx.buf[wr] = bitbuf;
wr = (wr + 1) % TXBUFFER_SIZE;
if (wr == chan->pkt.htx.rd)
*(int *)0 = 0; /* must not happen! */
bitbuf >>= 8;
numbit -= 8;
}
}
bitbuf |= 0x7e7e << numbit;
numbit += 16;
while (numbit >= 8) {
chan->pkt.htx.buf[wr] = bitbuf;
wr = (wr + 1) % TXBUFFER_SIZE;
if (wr == chan->pkt.htx.rd)
*(int *)0 = 0; /* must not happen! */
bitbuf >>= 8;
numbit -= 8;
}
chan->pkt.htx.wr = wr;
}
/* ---------------------------------------------------------------------- */
static void kiss_encodepkt(struct modemchannel *chan, unsigned char *data, unsigned dlen)
{
unsigned char *kbuf = alloca(dlen * 2 + 3);
unsigned char *bp = kbuf;
int i, len;
*bp++ = KISS_FEND;
*bp++ = KISS_CMD_DATA;
for (; dlen > 0; dlen--, data++) {
if (*data == KISS_FEND) {
*bp++ = KISS_FESC;
*bp++ = KISS_TFEND;
} else if (*data == KISS_FESC) {
*bp++ = KISS_FESC;
*bp++ = KISS_TFESC;
} else
*bp++ = *data;
}
*bp++ = KISS_FEND;
len = bp - kbuf;
i = write(chan->pkt.kiss.fd, kbuf, len);
if (i < 0) {
if (errno == EAGAIN || errno == EIO)
chan->pkt.stat.kiss_outerr++;
else
logerr(MLOG_FATAL, "kiss: write\n");
} else if (i < len)
logprintf(MLOG_ERROR, "kiss: write error: %d < %d\n", i, len);
else
chan->pkt.stat.kiss_out++;
}
static void do_rxpacket(struct modemchannel *chan)
{
if (chan->pkt.hrx.bufcnt < 3)
return;
if (!check_crc_ccitt(chan->pkt.hrx.buf, chan->pkt.hrx.bufcnt))
return;
chan->pkt.stat.pkt_in++;
{
char buf[512];
snprintpkt(buf, sizeof(buf), chan->pkt.hrx.buf, chan->pkt.hrx.bufcnt-2);
if (0)
printf("Rx: %s\n", buf);
}
kiss_encodepkt(chan, chan->pkt.hrx.buf, chan->pkt.hrx.bufcnt-2);
}
#define DECODEITERA(j) \
do { \
if (!(notbitstream & (0x0fc << j))) /* flag or abort */ \
goto flgabrt##j; \
if ((bitstream & (0x1f8 << j)) == (0xf8 << j)) /* stuffed bit */ \
goto stuff##j; \
enditer##j:; \
} while (0)
#define DECODEITERB(j) \
do { \
flgabrt##j: \
if (!(notbitstream & (0x1fc << j))) { /* abort received */ \
state = 0; \
goto enditer##j; \
} \
if ((bitstream & (0x1fe << j)) != (0x0fc << j)) /* flag received */ \
goto enditer##j; \
if (state) \
do_rxpacket(chan); \
chan->pkt.hrx.bufcnt = 0; \
chan->pkt.hrx.bufptr = chan->pkt.hrx.buf; \
state = 1; \
numbits = 7-j; \
goto enditer##j; \
stuff##j: \
numbits--; \
bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1); \
goto enditer##j; \
} while (0)
static inline void hdlc_receive(struct modemchannel *chan, const unsigned char *data, unsigned nrbytes)
{
unsigned bits, bitbuf, notbitstream, bitstream, numbits, state;
/* start of HDLC decoder */
numbits = chan->pkt.hrx.numbits;
state = chan->pkt.hrx.state;
bitstream = chan->pkt.hrx.bitstream;
bitbuf = chan->pkt.hrx.bitbuf;
while (nrbytes > 0) {
bits = *data++;
nrbytes--;
bitstream >>= 8;
bitstream |= ((unsigned int)bits) << 8;
bitbuf >>= 8;
bitbuf |= ((unsigned int)bits) << 8;
numbits += 8;
notbitstream = ~bitstream;
DECODEITERA(0);
DECODEITERA(1);
DECODEITERA(2);
DECODEITERA(3);
DECODEITERA(4);
DECODEITERA(5);
DECODEITERA(6);
DECODEITERA(7);
goto enddec;
DECODEITERB(0);
DECODEITERB(1);
DECODEITERB(2);
DECODEITERB(3);
DECODEITERB(4);
DECODEITERB(5);
DECODEITERB(6);
DECODEITERB(7);
enddec:
while (state && numbits >= 8) {
if (chan->pkt.hrx.bufcnt >= RXBUFFER_SIZE) {
state = 0;
} else {
*(chan->pkt.hrx.bufptr)++ = bitbuf >> (16-numbits);
chan->pkt.hrx.bufcnt++;
numbits -= 8;
}
}
}
chan->pkt.hrx.numbits = numbits;
chan->pkt.hrx.state = state;
chan->pkt.hrx.bitstream = bitstream;
chan->pkt.hrx.bitbuf = bitbuf;
}
/* ---------------------------------------------------------------------- */
static void kiss_process_pkt(struct modemchannel *chan, u_int8_t *pkt, unsigned int len)
{
if (len < 2)
return;
chan->pkt.stat.kiss_in++;
switch (pkt[0]) {
case KISS_CMD_DATA:
hdlc_encode(chan, pkt+1, len-1);
{
char buf[512];
snprintpkt(buf, sizeof(buf), pkt+1, len-1);
if (0)
printf("Tx: %s\n", buf);
}
return;
case KISS_CMD_TXDELAY:
state.chacc.txdelay = pkt[1]*10;
logprintf(MLOG_INFO, "kiss: txdelay = %ums\n", pkt[1]*10);
return;
case KISS_CMD_TXTAIL:
logprintf(MLOG_INFO, "kiss: txtail = %ums\n", pkt[1]*10);
return;
case KISS_CMD_PPERSIST:
state.chacc.ppersist = pkt[1];
logprintf(MLOG_INFO, "kiss: ppersist = %u/256\n", pkt[1]);
return;
case KISS_CMD_SLOTTIME:
state.chacc.slottime = pkt[1]*10;
logprintf(MLOG_INFO, "kiss: slottime = %ums\n", pkt[1]*10);
return;
case KISS_CMD_FULLDUP:
state.chacc.fullduplex = !!pkt[1];
logprintf(MLOG_INFO, "kiss: %sduplex\n", pkt[1] ? "full" : "half");
return;
default:
logprintf(MLOG_INFO, "unknown kiss packet: 0x%02x 0x%02x\n", pkt[0], pkt[1]);
return;
}
}
/* ---------------------------------------------------------------------- */
/* we decode inplace */
static void kiss_decode(struct modemchannel *chan, u_int8_t *b, int len)
{
int nlen = 0;
u_int8_t *p1 = b, *p2, *iframe;
iframe = p2 = alloca(len);
while (len > 0) {
if (*p1 != KISS_FESC) {
*p2++ = *p1++;
nlen++;
len--;
} else {
if (len < 2)
goto err; /* invalid escape */
if (p1[1] == KISS_TFEND)
*p2++ = KISS_FEND;
else if (p1[1] == KISS_TFESC)
*p2++ = KISS_FESC;
else
goto err; /* invalid escape */
nlen++;
p1 += 2;
len -= 2;
}
}
if (len > 0)
goto err;
kiss_process_pkt(chan, iframe, nlen);
return;
err:
logprintf(MLOG_ERROR, "KISS input error\n");
chan->pkt.stat.kiss_inerr++;
}
static void kiss_input(struct modemchannel *chan)
{
char *cp1, *cp2, *endp;
int i;
chan->pkt.kiss.ioerr = 0;
i = read(chan->pkt.kiss.fd, chan->pkt.kiss.ibuf + chan->pkt.kiss.ibufptr, sizeof(chan->pkt.kiss.ibuf) - chan->pkt.kiss.ibufptr);
if (i < 0) {
if (errno == EIO) {
chan->pkt.kiss.ioerr = 1;
return;
}
if (errno == EAGAIN)
return;
logerr(MLOG_FATAL, "KISS: read");
return;
}
if (!i)
return;
chan->pkt.kiss.ibufptr += i;
endp = chan->pkt.kiss.ibuf + chan->pkt.kiss.ibufptr;
cp1 = memchr(chan->pkt.kiss.ibuf, KISS_FEND, chan->pkt.kiss.ibufptr);
while (cp1) {
cp2 = memchr(cp1+1, KISS_FEND, endp - cp1 - 1);
if (!cp2) {
chan->pkt.kiss.ibufptr = endp-cp1;
memmove(chan->pkt.kiss.ibuf, cp1, chan->pkt.kiss.ibufptr);
return;
}
kiss_decode(chan, cp1+1, cp2-cp1-1);
cp1 = cp2;
}
}
/* ---------------------------------------------------------------------- */
static unsigned short random_num(void)
{
static unsigned short random_seed;
random_seed = 28629 * random_seed + 157;
return random_seed;
}
/* ---------------------------------------------------------------------- */
static unsigned int terminate = 0;
static int globaldcd(struct state *state)
{
struct modemchannel *chan;
for (chan = state->channels; chan; chan = chan->next)
if (chan->pkt.dcd)
return 1;
return 0;
}
static RETSIGTYPE sigusr1()
{
struct modemchannel *chan;
for (chan = state.channels; chan; chan = chan->next) {
logprintf(MLOG_INFO, "Interface %s:\n"
" KISS: in %u inerr %u out %u outerr %u PKT: in %u out %u\n",
chan->pkt.kiss.ifname, chan->pkt.stat.kiss_in, chan->pkt.stat.kiss_inerr,
chan->pkt.stat.kiss_out, chan->pkt.stat.kiss_outerr,
chan->pkt.stat.pkt_in, chan->pkt.stat.pkt_out);
}
}
static RETSIGTYPE sigterm()
{
terminate = 1;
}
int pktget(struct modemchannel *chan, unsigned char *data, unsigned int len)
{
unsigned int i, j, n = len;
i = (chan->pkt.htx.rd - chan->pkt.htx.wr - 1) % TXBUFFER_SIZE;
if (i > KISSINBUF_SIZE*6/5)
kiss_input(chan);
if (chan->pkt.inhibittx || chan->pkt.htx.rd == chan->pkt.htx.wr)
return 0;
while (n > 0) {
if (chan->pkt.htx.wr >= chan->pkt.htx.rd)
j = chan->pkt.htx.wr - chan->pkt.htx.rd;
else
j = TXBUFFER_SIZE - chan->pkt.htx.rd;
if (j > n)
j = n;
if (!j)
break;
memcpy(data, &chan->pkt.htx.buf[chan->pkt.htx.rd], j);
data += j;
n -= j;
chan->pkt.htx.rd = (chan->pkt.htx.rd + j) % TXBUFFER_SIZE;
}
if (n > 0)
memset(data, 0, n);
return (len - n);
}
void pktput(struct modemchannel *chan, const unsigned char *data, unsigned int len)
{
hdlc_receive(chan, data, len);
}
void p3dreceive(struct modemchannel *chan, const unsigned char *pkt, u_int16_t crc)
{
unsigned char buf[256+16];
unsigned int i;
if (crc)
return;
buf[0] = 'Q' << 1;
buf[1] = 'S' << 1;
buf[2] = 'T' << 1;
buf[3] = ' ' << 1;
buf[4] = ' ' << 1;
buf[5] = ' ' << 1;
buf[6] = (0 << 1) | 0x80;
buf[7] = 'A' << 1;
buf[8] = 'O' << 1;
buf[9] = '4' << 1;
buf[10] = '0' << 1;
buf[11] = ' ' << 1;
buf[12] = ' ' << 1;
buf[13] = (1 << 1) | 1;
buf[14] = 0x03; /* UI */
buf[15] = 0xf0; /* PID */
memcpy(&buf[16], &pkt[0], 256);
kiss_encodepkt(chan, buf, 256+16);
buf[13] = (2 << 1) | 1;
memcpy(&buf[16], &pkt[256], 256);
kiss_encodepkt(chan, buf, 256+16);
}
void p3drxstate(struct modemchannel *chan, unsigned int synced, unsigned int carrierfreq)
{
pktsetdcd(chan, !!synced);
}
#define NRPFD 8
static void waitfortx(struct state *state)
{
struct modemchannel *chan;
struct pollfd pfd[NRPFD];
unsigned int nr;
while (!terminate) {
int tmo = -1;
nr = 0;
for (chan = state->channels; chan; chan = chan->next) {
if (!chan->mod || !state->audioio->write)
continue;
if (chan->pkt.htx.rd != chan->pkt.htx.wr)
return;
kiss_input(chan);
if (chan->pkt.htx.rd != chan->pkt.htx.wr)
return;
if (1 && chan->pkt.kiss.ioerr) {
tmo = 10;
continue;
}
if (nr >= NRPFD)
logprintf(MLOG_FATAL, "pkttransmitloop: too many transmitters\n");
pfd[nr].events = chan->pkt.kiss.ioerr ? POLLERR : POLLIN;
pfd[nr].fd = chan->pkt.kiss.fd;
nr++;
}
if (!nr && tmo == -1)
return;
if (poll(pfd, nr, tmo) < 0)
logerr(MLOG_FATAL, "KISS: poll\n");
}
}
void pkttransmitloop(struct state *state)
{
struct modemchannel *chan, *chantail;
signal(SIGUSR1, sigusr1);
signal(SIGHUP, sigterm);
while (!terminate) {
waitfortx(state);
for (;;) {
if (state->chacc.fullduplex)
break;
if (!globaldcd(state) && (random_num() & 0xff) <= state->chacc.ppersist)
break;
usleep(state->chacc.slottime * 1000);
}
pttsetptt(&state->ptt, 1);
if (state->audioio->transmitstart)
state->audioio->transmitstart(state->audioio);
for (chan = state->channels; chan; chan = chan->next) {
if (chan->pkt.htx.rd == chan->pkt.htx.wr)
kiss_input(chan);
if (chan->mod && chan->pkt.htx.rd != chan->pkt.htx.wr)
break;
}
if (!chan)
break;
chan->pkt.inhibittx = 0;
chan->mod->modulate(chan->modstate, state->chacc.txdelay);
chan->pkt.inhibittx = 1;
chantail = chan;
for (chan = chan->next; chan; chan = chan->next) {
if (chan->pkt.htx.rd == chan->pkt.htx.wr)
kiss_input(chan);
if (chan->mod && chan->pkt.htx.rd != chan->pkt.htx.wr) {
chan->pkt.inhibittx = 0;
chan->mod->modulate(chan->modstate, 0);
chan->pkt.inhibittx = 1;
chantail = chan;
}
}
chantail->mod->modulate(chantail->modstate, state->chacc.txtail);
if (state->audioio->transmitstop)
state->audioio->transmitstop(state->audioio);
pttsetptt(&state->ptt, 0);
}
}
void pktsetdcd(struct modemchannel *chan, int dcd)
{
chan->pkt.dcd = !!dcd;
pttsetdcd(&chan->state->ptt, globaldcd(chan->state));
logprintf(250, "DCD: %s\n", dcd ? "on" : "off");
}
void pktrelease(struct modemchannel *chan)
{
close(chan->pkt.kiss.fd);
if (chan->pkt.kiss.fdmaster != -1)
close(chan->pkt.kiss.fdmaster);
chan->pkt.kiss.fd = chan->pkt.kiss.fdmaster = -1;
}
struct modemparams pktkissparams[] = {
{ "file", "File", "File (symlink) to send the KISS stream to", "/dev/soundmodem0",
MODEMPAR_COMBO, { c: { { "/dev/soundmodem0", "/dev/soundmodem1", "/dev/soundmodem2", "/dev/soundmodem3" } } } },
{ "unlink", "Unlink File", "Unlink File (above) on setup", "1", MODEMPAR_CHECKBUTTON },
{ NULL }
};
void pktinit(struct modemchannel *chan, const char *params[])
{
const char *file = params[0];
int dounlink;
struct termios tm;
char ttyname[32];
int master, slave;
memset(&chan->pkt, 0, sizeof(chan->pkt));
chan->pkt.inhibittx = 1;
if (!params[1])
dounlink = 1;
else
dounlink = !strcmp(params[1], "1");
if (!file)
logprintf(MLOG_FATAL, "KISS: No file name specified\n");
strncpy(chan->pkt.kiss.ifname, file, sizeof(chan->pkt.kiss.ifname));
if (openpty(&master, &slave, ttyname, NULL, NULL))
logerr(MLOG_FATAL, "openpty");
/* set mode to raw */
memset(&tm, 0, sizeof(tm));
tm.c_cflag = CS8 | CREAD | CLOCAL;
if (tcsetattr(master, TCSANOW, &tm))
logerr(MLOG_ERROR, "master: tcsetattr");
memset(&tm, 0, sizeof(tm));
tm.c_cflag = CS8 | CREAD | CLOCAL;
if (tcsetattr(slave, TCSANOW, &tm))
logerr(MLOG_FATAL, "slave: tcsetattr");
fchmod(slave, 0660);
if (dounlink)
unlink(file);
if (symlink(ttyname, file))
logprintf(MLOG_ERROR, "kiss: symlink error: %s -> %s\n", ttyname, file);
chan->pkt.kiss.fd = master;
chan->pkt.kiss.fdmaster = -1;
chan->pkt.kiss.ioerr = 1;
close(slave);
fcntl(chan->pkt.kiss.fd, F_SETFL, fcntl(chan->pkt.kiss.fd, F_GETFL, 0) | O_NONBLOCK);
chan->pkt.kiss.ibufptr = 0;
chan->pkt.dcd = 0;
}
/* ---------------------------------------------------------------------- */
#ifdef HAVE_MKISS
struct modemparams pktmkissparams[] = {
{ "ifname", "Interface Name", "Name of the Kernel KISS Interface", "sm0", MODEMPAR_COMBO,
{ c: { { "sm0", "sm1", "sm2", "ax0" } } } },
{ "hwaddr", "Callsign", "Callsign (Hardware Address)", "", MODEMPAR_STRING },
{ "ip", "IP Address", "IP Address (mandatory)", "10.0.0.1", MODEMPAR_STRING },
{ "netmask", "Network Mask", "Network Mask", "255.255.255.0", MODEMPAR_STRING },
{ "broadcast", "Broadcast Address", "Broadcast Address", "10.0.0.255", MODEMPAR_STRING },
{ NULL }
};
static int parsehw(ax25_address *hwaddr, const char *cp)
{
const char *cp1;
unsigned int i, j;
if (!cp || !*cp)
return 0;
memset(hwaddr->ax25_call, ' ', 6);
cp1 = strchr(cp, '-');
if (cp1) {
i = cp1 - cp;
j = strtoul(cp1 + 1, NULL, 0);
hwaddr->ax25_call[6] = j & 15;
} else {
i = strlen(cp);
hwaddr->ax25_call[6] = 0;
}
if (i > 6)
i = 6;
memcpy(hwaddr->ax25_call, cp, i);
for (i = 0; i < 6; i++)
if (hwaddr->ax25_call[i] >= 'a' && hwaddr->ax25_call[i] <= 'z')
hwaddr->ax25_call[i] += 'A' - 'a';
for (i = 0; i < 7; i++)
hwaddr->ax25_call[i] <<= 1;
return 1;
}
static int parseip(struct in_addr *ipaddr, const char *cp)
{
if (!cp || !*cp)
return 0;
if (inet_aton(cp, ipaddr))
return 1;
ipaddr->s_addr = 0;
logprintf(MLOG_ERROR, "mkiss: invalid IP address \"%s\"\n", cp);
return 0;
}
void pktinitmkiss(struct modemchannel *chan, const char *params[])
{
struct termios tm;
char ttyname[32];
int master, slave, fd, disc = N_AX25, encap = 4;
struct ifreq ifr;
char mbuf[512], *mptr = mbuf;
struct sockaddr_ax25 sax25;
struct sockaddr_in sin;
unsigned i;
memset(&chan->pkt, 0, sizeof(chan->pkt));
chan->pkt.inhibittx = 1;
if (!params[0])
logprintf(MLOG_FATAL, "MKISS: No interface name specified\n");
strncpy(chan->pkt.kiss.ifname, params[0], sizeof(chan->pkt.kiss.ifname));
if (openpty(&master, &slave, ttyname, NULL, NULL))
logerr(MLOG_FATAL, "openpty");
/* set mode to raw */
memset(&tm, 0, sizeof(tm));
tm.c_cflag = CS8 | CREAD | CLOCAL;
if (tcsetattr(master, TCSANOW, &tm))
logerr(MLOG_FATAL, "master: tcsetattr");
memset(&tm, 0, sizeof(tm));
tm.c_cflag = CS8 | CREAD | CLOCAL;
if (tcsetattr(slave, TCSANOW, &tm))
logerr(MLOG_FATAL, "slave: tcsetattr");
/* set the line discipline */
if (ioctl(master, TIOCSETD, &disc) == -1)
logerr(MLOG_FATAL, "ioctl: TIOCSETD");
if (ioctl(master, SIOCSIFENCAP, &encap) == -1)
logerr(MLOG_FATAL, "ioctl: SIOCSIFENCAP");
/* try to set the interface name */
if (params[0]) {
if (ioctl(master, SIOCGIFNAME, &ifr) == -1)
logerr(MLOG_FATAL, "ioctl: SIOCGIFNAME");
if (strcmp(params[0], ifr.ifr_name)) {
if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
logerr(MLOG_FATAL, "socket (setifname)");
strncpy(ifr.ifr_newname, params[0], sizeof(ifr.ifr_newname));
ifr.ifr_newname[sizeof(ifr.ifr_newname) - 1] = 0;
if (ioctl(fd, SIOCSIFNAME, &ifr) == -1) {
logerr(1, "ioctl: SIOCSIFNAME");
logprintf(1, "mkiss: cannot set ifname to %s, using %s (old kernel version?)\n",
params[0], ifr.ifr_name);
}
close(fd);
}
}
if (ioctl(master, SIOCGIFNAME, &ifr) == -1)
logerr(MLOG_FATAL, "ioctl: SIOCGIFNAME");
strncpy(chan->pkt.kiss.ifname, ifr.ifr_name, sizeof(chan->pkt.kiss.ifname));
/* start the interface */
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
logerr(MLOG_FATAL, "socket");
mptr += sprintf(mptr, "ifname %s mtu 256", ifr.ifr_name);
ifr.ifr_mtu = 256;
if (ioctl(fd, SIOCSIFMTU, &ifr) == -1)
logerr(MLOG_FATAL, "ioctl: SIOCSIFMTU");
if (parsehw(&sax25.sax25_call, params[1])) {
sax25.sax25_family = ARPHRD_AX25;
sax25.sax25_ndigis = 0;
memcpy(&ifr.ifr_hwaddr, &sax25, sizeof(ifr.ifr_hwaddr));
if (ioctl(fd, SIOCSIFHWADDR, &ifr) == -1)
logerr(MLOG_ERROR, "ioctl: SIOCSIFHWADDR");
else {
mptr += sprintf(mptr, " hwaddr ");
for (i = 0; i < 6; i++)
if (sax25.sax25_call.ax25_call[i] != (' ' << 1))
*mptr++ = (sax25.sax25_call.ax25_call[i] >> 1) & 0x7f;
mptr += sprintf(mptr, "-%d", (sax25.sax25_call.ax25_call[6] >> 1) & 0x7f);
}
}
if (parseip(&sin.sin_addr, params[2])) {
sin.sin_family = AF_INET;
memcpy(&ifr.ifr_addr, &sin, sizeof(ifr.ifr_addr));
if (ioctl(fd, SIOCSIFADDR, &ifr) == -1)
logerr(MLOG_ERROR, "ioctl: SIOCSIFADDR");
else
mptr += sprintf(mptr, " ipaddr %s", inet_ntoa(sin.sin_addr));
}
if (parseip(&sin.sin_addr, params[3])) {
sin.sin_family = AF_INET;
memcpy(&ifr.ifr_netmask, &sin, sizeof(ifr.ifr_netmask));
if (ioctl(fd, SIOCSIFNETMASK, &ifr) == -1)
logerr(MLOG_ERROR, "ioctl: SIOCSIFNETMASK");
else
mptr += sprintf(mptr, " netmask %s", inet_ntoa(sin.sin_addr));
}
if (parseip(&sin.sin_addr, params[4])) {
sin.sin_family = AF_INET;
memcpy(&ifr.ifr_broadaddr, &sin, sizeof(ifr.ifr_broadaddr));
if (ioctl(fd, SIOCSIFBRDADDR, &ifr) == -1)
logerr(MLOG_ERROR, "ioctl: SIOCSIFBRDADDR");
else
mptr += sprintf(mptr, " broadcast %s", inet_ntoa(sin.sin_addr));
}
if (ioctl(fd, SIOCGIFFLAGS, &ifr) == -1)
logerr(0, "ioctl: SIOCGIFFLAGS");
ifr.ifr_flags &= ~IFF_NOARP;
ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
if (ioctl(fd, SIOCSIFFLAGS, &ifr) == -1)
logerr(MLOG_FATAL, "ioctl: SIOCSIFFLAGS");
close(fd);
logprintf(MLOG_INFO, "mkiss: %s\n", mbuf);
/* prepare for using it */
chan->pkt.kiss.fd = slave;
chan->pkt.kiss.fdmaster = master;
chan->pkt.kiss.ioerr = 0;
fcntl(chan->pkt.kiss.fd, F_SETFL, fcntl(chan->pkt.kiss.fd, F_GETFL, 0) | O_NONBLOCK);
chan->pkt.kiss.ibufptr = 0;
chan->pkt.dcd = 0;
}
#else /* HAVE_MKISS */
struct modemparams pktmkissparams[] = {
{ NULL }
};
void pktinitmkiss(struct modemchannel *chan, const char *params[])
{
logprintf(MLOG_FATAL, "mkiss not supported on this architecture\n");
}
#endif /* HAVE_MKISS */
/* ---------------------------------------------------------------------- */
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