832 lines
17 KiB
C
832 lines
17 KiB
C
/*
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* PPP Modem handling module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: modem.c,v 1.40 1997/05/26 00:44:06 brian Exp $
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*
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* TODO:
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*/
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#include "fsm.h"
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#include <fcntl.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <errno.h>
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#include <time.h>
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#include <libutil.h>
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#include "hdlc.h"
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#include "lcp.h"
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#include "ip.h"
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#include "modem.h"
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#include "loadalias.h"
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#include "vars.h"
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#ifndef O_NONBLOCK
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#ifdef O_NDELAY
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#define O_NONBLOCK O_NDELAY
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#endif
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#endif
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extern int DoChat();
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static int mbits; /* Current DCD status */
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static int connect_count;
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static struct pppTimer ModemTimer;
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extern void PacketMode(), TtyTermMode(), TtyCommandMode();
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extern int TermMode;
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#define Online (mbits & TIOCM_CD)
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static struct mbuf *modemout;
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static struct mqueue OutputQueues[PRI_LINK+1];
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static int dev_is_modem;
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#undef QDEBUG
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void
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Enqueue(queue, bp)
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struct mqueue *queue;
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struct mbuf *bp;
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{
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if (queue->last) {
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queue->last->pnext = bp;
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queue->last = bp;
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} else
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queue->last = queue->top = bp;
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queue->qlen++;
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#ifdef QDEBUG
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logprintf("Enqueue: len = %d\n", queue->qlen);
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#endif
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}
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struct mbuf *
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Dequeue(queue)
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struct mqueue *queue;
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{
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struct mbuf *bp;
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#ifdef QDEBUG
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logprintf("Dequeue: len = %d\n", queue->qlen);
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#endif
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bp = queue->top;
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if (bp) {
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queue->top = queue->top->pnext;
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queue->qlen--;
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if (queue->top == NULL) {
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queue->last = queue->top;
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#ifdef QDEBUG
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if (queue->qlen)
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logprintf("!!! not zero (%d)!!!\n", queue->qlen);
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#endif
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}
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}
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return(bp);
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}
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static struct speeds{
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int nspeed;
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speed_t speed;
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} speeds[] = {
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#ifdef B50
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{ 50, B50, },
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#endif
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#ifdef B75
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{ 75, B75, },
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#endif
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#ifdef B110
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{ 110, B110, },
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#endif
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#ifdef B134
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{ 134, B134, },
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#endif
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#ifdef B150
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{ 150, B150, },
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#endif
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#ifdef B200
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{ 200, B200, },
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#endif
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#ifdef B300
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{ 300, B300, },
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#endif
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#ifdef B600
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{ 600, B600, },
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#endif
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#ifdef B1200
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{ 1200, B1200, },
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#endif
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#ifdef B1800
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{ 1800, B1800, },
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#endif
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#ifdef B2400
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{ 2400, B2400, },
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#endif
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#ifdef B4800
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{ 4800, B4800, },
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#endif
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#ifdef B9600
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{ 9600, B9600, },
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#endif
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#ifdef B19200
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{ 19200, B19200, },
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#endif
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#ifdef B38400
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{ 38400, B38400, },
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#endif
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#ifndef _POSIX_SOURCE
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#ifdef B7200
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{ 7200, B7200, },
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#endif
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#ifdef B14400
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{ 14400, B14400, },
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#endif
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#ifdef B28800
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{ 28800, B28800, },
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#endif
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#ifdef B57600
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{ 57600, B57600, },
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#endif
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#ifdef B76800
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{ 76800, B76800, },
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#endif
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#ifdef B115200
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{ 115200, B115200, },
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#endif
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#ifdef B230400
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{ 230400, B230400, },
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#endif
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#ifdef EXTA
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{ 19200, EXTA, },
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#endif
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#ifdef EXTB
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{ 38400, EXTB, },
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#endif
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#endif /*_POSIX_SOURCE */
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{ 0, 0 }
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};
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int SpeedToInt(speed)
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speed_t speed;
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{
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struct speeds *sp;
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for (sp = speeds; sp->nspeed; sp++) {
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if (sp->speed == speed) {
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return(sp->nspeed);
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}
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}
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return 0;
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}
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speed_t IntToSpeed(nspeed)
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int nspeed;
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{
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struct speeds *sp;
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for (sp = speeds; sp->nspeed; sp++) {
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if (sp->nspeed == nspeed) {
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return(sp->speed);
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}
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}
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return B0;
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}
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static time_t uptime;
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void
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DownConnection()
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{
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LogPrintf(LOG_PHASE_BIT, "Disconnected!\n");
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LogPrintf(LOG_PHASE_BIT, "Connect time: %d secs\n", time(NULL) - uptime);
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if (!TermMode) {
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CloseModem();
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LcpDown();
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}
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}
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/*
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* ModemTimeout() watches DCD signal and notifies if it's status is changed.
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*
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*/
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void
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ModemTimeout()
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{
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int ombits = mbits;
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int change;
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StopTimer(&ModemTimer);
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StartTimer(&ModemTimer);
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if (dev_is_modem) {
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if (modem >= 0) {
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if (ioctl(modem, TIOCMGET, &mbits) < 0) {
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LogPrintf(LOG_PHASE_BIT, "ioctl error (%s)!\n", strerror(errno));
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DownConnection();
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return;
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}
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} else
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mbits = 0;
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change = ombits ^ mbits;
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if (change & TIOCM_CD) {
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if (Online) {
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time(&uptime);
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LogPrintf(LOG_PHASE_BIT, "*Connected!\n");
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connect_count++;
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/*
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* In dedicated mode, start packet mode immediate
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* after we detected carrier.
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*/
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if (mode & MODE_DEDICATED)
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PacketMode();
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} else {
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reconnect(RECON_TRUE);
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DownConnection();
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}
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}
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} else {
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if (!Online) {
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time(&uptime);
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LogPrintf(LOG_PHASE_BIT, "Connected!\n");
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mbits = TIOCM_CD;
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connect_count++;
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} else if (uptime == 0) {
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time(&uptime);
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}
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}
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}
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void
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StartModemTimer()
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{
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StopTimer(&ModemTimer);
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ModemTimer.state = TIMER_STOPPED;
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ModemTimer.load = SECTICKS;
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ModemTimer.func = ModemTimeout;
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StartTimer(&ModemTimer);
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}
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struct parity {
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char *name;
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char *name1;
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int set;
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} validparity[] = {
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{ "even", "P_EVEN", CS7 | PARENB }, { "odd", "P_ODD", CS7 | PARENB | PARODD },
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{ "none", "P_ZERO", CS8 }, { NULL, 0 },
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};
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int
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GetParityValue(str)
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char *str;
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{
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struct parity *pp;
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for (pp = validparity; pp->name; pp++) {
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if (strcasecmp(pp->name, str) == 0 ||
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strcasecmp(pp->name1, str) == 0) {
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VarParity = pp->set;
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return(pp->set);
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}
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}
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return(-1);
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}
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int
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ChangeParity(str)
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char *str;
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{
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struct termios rstio;
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int val;
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val = GetParityValue(str);
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if (val > 0) {
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VarParity = val;
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tcgetattr(modem, &rstio);
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rstio.c_cflag &= ~(CSIZE|PARODD|PARENB);
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rstio.c_cflag |= val;
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tcsetattr(modem, TCSADRAIN, &rstio);
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}
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return(val);
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}
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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int
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OpenConnection(host, port)
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char *host, *port;
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{
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struct sockaddr_in dest;
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int sock;
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struct hostent *hp;
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struct servent *sp;
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dest.sin_family = AF_INET;
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dest.sin_addr.s_addr = inet_addr(host);
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if (dest.sin_addr.s_addr == INADDR_NONE) {
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hp = gethostbyname(host);
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if (hp) {
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bcopy(hp->h_addr_list[0], &dest.sin_addr.s_addr, 4);
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} else {
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printf("unknown host: %s\n", host);
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return(-1);
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}
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}
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dest.sin_port = htons(atoi(port));
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if (dest.sin_port == 0) {
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sp = getservbyname(port, "tcp");
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if (sp) {
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dest.sin_port = sp->s_port;
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} else {
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printf("unknown service: %s\n", port);
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return(-1);
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}
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}
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LogPrintf(LOG_PHASE_BIT, "Connected to %s:%s\n", host, port);
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sock = socket(PF_INET, SOCK_STREAM, 0);
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if (sock < 0) {
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return(sock);
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}
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if (connect(sock, (struct sockaddr *)&dest, sizeof(dest)) < 0) {
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printf("connection failed.\n");
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return(-1);
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}
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return(sock);
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}
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static struct termios modemios;
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int
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OpenModem(mode)
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int mode;
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{
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struct termios rstio;
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int oldflag;
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char *host, *cp, *port;
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int res;
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mbits = 0;
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if (mode & MODE_DIRECT) {
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if (isatty(0)) {
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modem = open(ctermid(NULL), O_RDWR|O_NONBLOCK);
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if (modem < 0) {
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LogPrintf(LOG_PHASE_BIT, "Open Failed %s\n", ctermid(NULL));
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return(modem);
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}
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} else if (modem < 0)
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return(modem);
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} else if (modem < 0) {
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if (strncmp(VarDevice, "/dev/", 5) == 0) {
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if ((res = uu_lock(VarBaseDevice)) != UU_LOCK_OK) {
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if (res == UU_LOCK_INUSE)
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LogPrintf(LOG_PHASE_BIT, "Modem %s is in use\n", VarDevice);
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else
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LogPrintf(LOG_PHASE_BIT, "Modem %s is in use: uu_lock: %s\n",
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VarDevice, uu_lockerr(res));
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return(-1);
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}
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modem = open(VarDevice, O_RDWR|O_NONBLOCK);
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if (modem < 0) {
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LogPrintf(LOG_PHASE_BIT, "Open Failed %s\n", VarDevice);
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(void) uu_unlock(VarBaseDevice);
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return(modem);
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}
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} else {
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/* XXX: PPP over TCP */
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cp = index(VarDevice, ':');
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if (cp) {
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*cp = 0;
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host = VarDevice;
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port = cp + 1;
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if (*host && *port) {
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modem = OpenConnection(host, port);
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*cp = ':'; /* Don't destroy VarDevice */
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if (modem < 0) return(-1);
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} else {
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*cp = ':'; /* Don't destroy VarDevice */
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return(-1);
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}
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} else
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return(-1);
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}
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}
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/* This code gets around the problem of closing descriptor 0
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* when it should not have been closed and closing descriptor 1
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* when the telnet connection dies. Since this program always
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* opens a descriptor for the modem in auto and direct mode,
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* having to dup the descriptor here is a fatal error.
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*
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* With the other changes I have made this should no longer happen.
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* JC
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*/
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while (modem < 3)
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{
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logprintf("Duping modem fd %d\n", modem);
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modem = dup(modem);
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}
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/*
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* If we are working on tty device, change it's mode into
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* the one desired for further operation. In this implementation,
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* we assume that modem is configuted to use CTS/RTS flow control.
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*/
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dev_is_modem = isatty(modem) || DEV_IS_SYNC;
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if (DEV_IS_SYNC)
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sleep(1);
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if (dev_is_modem && !DEV_IS_SYNC) {
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tcgetattr(modem, &rstio);
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modemios = rstio;
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#ifdef DEBUG
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logprintf("## modem = %d\n", modem);
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logprintf("modem (get): iflag = %x, oflag = %x, cflag = %x\n",
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rstio.c_iflag, rstio.c_oflag, rstio.c_cflag);
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#endif
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cfmakeraw(&rstio);
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if (VarCtsRts)
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rstio.c_cflag |= CLOCAL | CCTS_OFLOW|CRTS_IFLOW;
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else {
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rstio.c_cflag |= CLOCAL;
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rstio.c_iflag |= IXOFF;
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}
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rstio.c_iflag |= IXON;
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if (!(mode & MODE_DEDICATED))
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rstio.c_cflag |= HUPCL;
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if ((mode & MODE_DIRECT) == 0) {
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/*
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* If we are working as direct mode, don't change tty speed.
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*/
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rstio.c_cflag &= ~(CSIZE|PARODD|PARENB);
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rstio.c_cflag |= VarParity;
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if (cfsetspeed(&rstio, IntToSpeed(VarSpeed)) == -1) {
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logprintf("Unable to set modem speed (modem %d to %d)\n",
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modem, VarSpeed);
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}
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}
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tcsetattr(modem, TCSADRAIN, &rstio);
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#ifdef DEBUG
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logprintf("modem (put): iflag = %x, oflag = %x, cflag = %x\n",
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rstio.c_iflag, rstio.c_oflag, rstio.c_cflag);
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#endif
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if (!(mode & MODE_DIRECT))
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if (ioctl(modem, TIOCMGET, &mbits))
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return(-1);
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#ifdef DEBUG
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fprintf(stderr, "modem control = %o\n", mbits);
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#endif
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oldflag = fcntl(modem, F_GETFL, 0);
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if (oldflag < 0)
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return(-1);
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(void)fcntl(modem, F_SETFL, oldflag & ~O_NONBLOCK);
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}
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StartModemTimer();
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return(modem);
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}
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int
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ModemSpeed()
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{
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struct termios rstio;
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tcgetattr(modem, &rstio);
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return(SpeedToInt(cfgetispeed(&rstio)));
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}
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/*
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* Put modem tty line into raw mode which is necessary in packet mode operation
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*/
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int
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RawModem(modem)
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int modem;
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{
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struct termios rstio;
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int oldflag;
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if (!isatty(modem) || DEV_IS_SYNC)
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return(0);
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if (!(mode & MODE_DIRECT) && modem >= 0 && !Online) {
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#ifdef DEBUG
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logprintf("mode = %d, modem = %d, mbits = %x\n", mode, modem, mbits);
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#endif
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#ifdef notdef
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return(-1);
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#endif
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}
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tcgetattr(modem, &rstio);
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cfmakeraw(&rstio);
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if (VarCtsRts)
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rstio.c_cflag |= CLOCAL | CCTS_OFLOW|CRTS_IFLOW;
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else
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rstio.c_cflag |= CLOCAL;
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if (!(mode & MODE_DEDICATED))
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rstio.c_cflag |= HUPCL;
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tcsetattr(modem, TCSADRAIN, &rstio);
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oldflag = fcntl(modem, F_GETFL, 0);
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if (oldflag < 0)
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return(-1);
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(void)fcntl(modem, F_SETFL, oldflag | O_NONBLOCK);
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#ifdef DEBUG
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oldflag = fcntl(modem, F_GETFL, 0);
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logprintf("modem (put2): iflag = %x, oflag = %x, cflag = %x\n",
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rstio.c_iflag, rstio.c_oflag, rstio.c_cflag);
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logprintf("flag = %x\n", oldflag);
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#endif
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return(0);
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}
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void
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UnrawModem(modem)
|
|
int modem;
|
|
{
|
|
int oldflag;
|
|
|
|
if (isatty(modem) && !DEV_IS_SYNC) {
|
|
tcsetattr(modem, TCSAFLUSH, &modemios);
|
|
oldflag = fcntl(modem, F_GETFL, 0);
|
|
if (oldflag < 0)
|
|
return;
|
|
(void)fcntl(modem, F_SETFL, oldflag & ~O_NONBLOCK);
|
|
}
|
|
}
|
|
|
|
void
|
|
HangupModem(flag)
|
|
int flag;
|
|
{
|
|
struct termios tio;
|
|
|
|
if (!isatty(modem)) {
|
|
mbits &= ~TIOCM_DTR;
|
|
close(modem);
|
|
modem = -1; /* Mark as modem has closed */
|
|
return;
|
|
}
|
|
|
|
if (modem >= 0 && Online) {
|
|
mbits &= ~TIOCM_DTR;
|
|
#ifdef __bsdi__ /* not a POSIX way */
|
|
ioctl(modem, TIOCMSET, &mbits);
|
|
#else
|
|
tcgetattr(modem, &tio);
|
|
if (cfsetspeed(&tio, B0) == -1) {
|
|
logprintf("Unable to set modem to speed 0\n");
|
|
}
|
|
tcsetattr(modem, TCSANOW, &tio);
|
|
#endif
|
|
sleep(1);
|
|
#ifdef notdef
|
|
mbits &= ~TIOCM_CD;
|
|
#endif
|
|
}
|
|
/*
|
|
* If we are working as dedicated mode, never close it
|
|
* until we are directed to quit program.
|
|
*/
|
|
if (modem >= 0 && (flag || !(mode & MODE_DEDICATED))) {
|
|
ModemTimeout(); /* XXX */
|
|
StopTimer(&ModemTimer); /* XXX */
|
|
|
|
/* ModemTimeout() may call DownConection() to close the modem
|
|
* resulting in modem == 0.
|
|
*/
|
|
if (modem >= 0)
|
|
{
|
|
tcflush(modem, TCIOFLUSH);
|
|
UnrawModem(modem);
|
|
close(modem);
|
|
}
|
|
modem = -1; /* Mark as modem has closed */
|
|
(void) uu_unlock(VarBaseDevice);
|
|
} else if (modem >= 0) {
|
|
mbits |= TIOCM_DTR;
|
|
#ifndef notyet
|
|
ioctl(modem, TIOCMSET, &mbits);
|
|
#else
|
|
tcgetattr(modem, &ts);
|
|
cfsetspeed(&ts, IntToSpeed(VarSpeed));
|
|
tcsetattr(modem, TCSADRAIN, &ts);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void
|
|
CloseModem()
|
|
{
|
|
if (modem >= 0)
|
|
{
|
|
close(modem);
|
|
modem = -1;
|
|
}
|
|
(void) uu_unlock(VarBaseDevice);
|
|
}
|
|
|
|
/*
|
|
* Write to modem. Actualy, requested packets are queued, and goes out
|
|
* to the line when ModemStartOutput() is called.
|
|
*/
|
|
void
|
|
WriteModem(pri, ptr, count)
|
|
int pri;
|
|
char *ptr;
|
|
int count;
|
|
{
|
|
struct mbuf *bp;
|
|
|
|
bp = mballoc(count, MB_MODEM);
|
|
bcopy(ptr, MBUF_CTOP(bp), count);
|
|
|
|
/* Should be NORMAL and LINK only.
|
|
* All IP frames get here marked NORMAL.
|
|
*/
|
|
Enqueue(&OutputQueues[pri], bp);
|
|
}
|
|
|
|
void
|
|
ModemOutput(pri, bp)
|
|
int pri;
|
|
struct mbuf *bp;
|
|
{
|
|
struct mbuf *wp;
|
|
int len;
|
|
|
|
len = plength(bp);
|
|
wp = mballoc(len, MB_MODEM);
|
|
mbread(bp, MBUF_CTOP(wp), len);
|
|
Enqueue(&OutputQueues[pri], wp);
|
|
ModemStartOutput(modem);
|
|
}
|
|
|
|
int
|
|
ModemQlen()
|
|
{
|
|
struct mqueue *queue;
|
|
int len = 0;
|
|
int i;
|
|
|
|
for ( i = PRI_NORMAL; i <= PRI_LINK; i ++ ) {
|
|
queue = &OutputQueues[i];
|
|
len += queue->qlen;
|
|
}
|
|
return(len);
|
|
|
|
}
|
|
|
|
void
|
|
ModemStartOutput(fd)
|
|
int fd;
|
|
{
|
|
struct mqueue *queue;
|
|
int nb, nw;
|
|
#ifdef QDEBUG
|
|
int i;
|
|
#endif
|
|
|
|
if (modemout == NULL && ModemQlen() == 0)
|
|
IpStartOutput();
|
|
if (modemout == NULL) {
|
|
#ifdef QDEBUG
|
|
i = PRI_LINK;
|
|
#endif
|
|
for (queue = &OutputQueues[PRI_LINK]; queue >= OutputQueues; queue--) {
|
|
if (queue->top) {
|
|
modemout = Dequeue(queue);
|
|
#ifdef QDEBUG
|
|
if (i > PRI_NORMAL) {
|
|
struct mqueue *q;
|
|
|
|
q = &OutputQueues[0];
|
|
logprintf("output from queue %d, normal has %d\n", i, q->qlen);
|
|
}
|
|
logprintf("Dequeue(%d): ", i);
|
|
#endif
|
|
break;
|
|
}
|
|
#ifdef QDEBUG
|
|
i--;
|
|
#endif
|
|
}
|
|
}
|
|
if (modemout) {
|
|
nb = modemout->cnt;
|
|
if (nb > 1600) nb = 1600;
|
|
if (fd == 0) fd = 1; /* XXX WTFO! This is bogus */
|
|
nw = write(fd, MBUF_CTOP(modemout), nb);
|
|
#ifdef QDEBUG
|
|
logprintf("wrote: %d(%d)\n", nw, nb);
|
|
LogDumpBuff(LOG_HDLC, "modem write", MBUF_CTOP(modemout), nb);
|
|
#endif
|
|
if (nw > 0) {
|
|
modemout->cnt -= nw;
|
|
modemout->offset += nw;
|
|
if (modemout->cnt == 0) {
|
|
modemout = mbfree(modemout);
|
|
#ifdef QDEBUG
|
|
logprintf(" mbfree\n");
|
|
#endif
|
|
}
|
|
} else if (nw < 0) {
|
|
if (errno != EAGAIN)
|
|
perror("modem write");
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
DialModem()
|
|
{
|
|
char ScriptBuffer[200];
|
|
int excode;
|
|
|
|
strncpy(ScriptBuffer, VarDialScript,sizeof(ScriptBuffer)-1);
|
|
ScriptBuffer[sizeof(ScriptBuffer)-1] = '\0';
|
|
if (DoChat(ScriptBuffer) > 0) {
|
|
if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER)
|
|
fprintf(stderr, "dial OK!\n");
|
|
strncpy(ScriptBuffer, VarLoginScript,sizeof(ScriptBuffer)-1);
|
|
if (DoChat(ScriptBuffer) > 0) {
|
|
if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER)
|
|
fprintf(stderr, "login OK!\n");
|
|
return EX_DONE;
|
|
}
|
|
if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER)
|
|
fprintf(stderr, "login failed.\n");
|
|
ModemTimeout(); /* Dummy call to check modem status */
|
|
excode = EX_NOLOGIN;
|
|
}
|
|
else {
|
|
if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER)
|
|
fprintf(stderr, "dial failed.\n");
|
|
excode = EX_NODIAL;
|
|
}
|
|
HangupModem(0);
|
|
return(excode);
|
|
}
|
|
|
|
int
|
|
ShowModemStatus()
|
|
{
|
|
#ifdef TIOCOUTQ
|
|
int nb;
|
|
#endif
|
|
|
|
printf("device: %s speed: ", VarDevice);
|
|
if (DEV_IS_SYNC)
|
|
printf("sync\n");
|
|
else
|
|
printf("%d\n", VarSpeed);
|
|
|
|
switch (VarParity & CSIZE) {
|
|
case CS7:
|
|
printf("cs7, ");
|
|
break;
|
|
case CS8:
|
|
printf("cs8, ");
|
|
break;
|
|
}
|
|
if (VarParity & PARENB) {
|
|
if (VarParity & PARODD)
|
|
printf("odd parity, ");
|
|
else
|
|
printf("even parity, ");
|
|
} else
|
|
printf("no parity, ");
|
|
|
|
printf("CTS/RTS %s.\n", (VarCtsRts? "on" : "off"));
|
|
|
|
#ifdef DEBUG
|
|
printf("fd = %d, modem control = %o\n", modem, mbits);
|
|
#endif
|
|
printf("connect count: %d\n", connect_count);
|
|
#ifdef TIOCOUTQ
|
|
if (ioctl(modem, TIOCOUTQ, &nb) > 0)
|
|
printf("outq: %d\n", nb);
|
|
else
|
|
printf("outq: ioctl probe failed.\n");
|
|
#endif
|
|
printf("outqlen: %d\n", ModemQlen());
|
|
printf("DialScript = %s\n", VarDialScript);
|
|
printf("LoginScript = %s\n", VarLoginScript);
|
|
printf("PhoneNumber(s) = %s\n", VarPhoneList);
|
|
return(1);
|
|
}
|