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/*
* modem.c - Modem control functions.
*
* Copyright (c) 1994, 1995, 1996 Eric Schenk.
* All rights reserved. Please see the file LICENSE which should be
* distributed with this software for terms of use.
*
* Portions of this code were derived from the code for pppd copyright
* (c) 1989 Carnegie Mellon University. The copyright notice on this code
* is reproduced below.
*
* Copyright (c) 1989 Carnegie Mellon University.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Carnegie Mellon University. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "diald.h"
static char *current_dev = 0;
static int rotate_offset = 0;
/* local variables */
static struct termios inittermios; /* Initial TTY termios */
static int restore_term = 0;
int pgrpid;
#if B9600 == 9600
/*
* XXX assume speed_t values numerically equal bits per second
* (so we can ask for any speed).
*/
#define translate_speed(bps) (bps)
#else
/*
* List of valid speeds.
*/
struct speed {
int speed_int, speed_val;
} speeds[] = {
#ifdef B50
{ 50, B50 },
#endif
#ifdef B75
{ 75, B75 },
#endif
#ifdef B110
{ 110, B110 },
#endif
#ifdef B134
{ 134, B134 },
#endif
#ifdef B150
{ 150, B150 },
#endif
#ifdef B200
{ 200, B200 },
#endif
#ifdef B300
{ 300, B300 },
#endif
#ifdef B600
{ 600, B600 },
#endif
#ifdef B1200
{ 1200, B1200 },
#endif
#ifdef B1800
{ 1800, B1800 },
#endif
#ifdef B2000
{ 2000, B2000 },
#endif
#ifdef B2400
{ 2400, B2400 },
#endif
#ifdef B3600
{ 3600, B3600 },
#endif
#ifdef B4800
{ 4800, B4800 },
#endif
#ifdef B7200
{ 7200, B7200 },
#endif
#ifdef B9600
{ 9600, B9600 },
#endif
#ifdef B19200
{ 19200, B19200 },
#endif
#ifdef B38400
{ 38400, B38400 },
#endif
#ifdef EXTA
{ 19200, EXTA },
#endif
#ifdef EXTB
{ 38400, EXTB },
#endif
#ifdef B57600
{ 57600, B57600 },
#endif
#ifdef B115200
{ 115200, B115200 },
#endif
#ifdef B230400
{ 230400, B230400 },
#endif
#ifdef B460800
{ 460800, B460800 },
#endif
{ 0, 0 }
};
/*
* Translate from bits/second to a speed_t.
*/
int translate_speed(int bps)
{
struct speed *speedp;
if (bps == 0)
return 0;
for (speedp = speeds; speedp->speed_int; speedp++)
if (bps == speedp->speed_int)
return speedp->speed_val;
syslog(LOG_WARNING, "speed %d not supported", bps);
return 0;
}
#endif
/*
* set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
* at the requested speed, etc. If `local' is true, set CLOCAL
* regardless of whether the modem option was specified.
*/
void set_up_tty(int fd, int local, int spd)
{
int speed, i;
struct termios tios;
if (tcgetattr(fd, &tios) < 0) {
syslog(LOG_ERR, "could not get initial terminal attributes: %m");
}
tios.c_cflag = CS8 | CREAD | HUPCL;
if (local || !modem) tios.c_cflag |= CLOCAL;
if (crtscts == 1) tios.c_cflag |= CRTSCTS;
tios.c_iflag = IGNBRK | IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
for (i = 0; i < NCCS; i++)
tios.c_cc[i] = 0;
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
speed = translate_speed(spd);
if (speed) {
cfsetospeed(&tios, speed);
cfsetispeed(&tios, speed);
} else {
speed = cfgetospeed(&tios);
}
if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
syslog(LOG_ERR, "failed to set terminal attributes: %m");
}
}
/*
* setdtr - control the DTR line on the serial port.
* This is called from die(), so it shouldn't call die().
*/
void setdtr(int fd, int on)
{
int modembits = TIOCM_DTR;
ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
}
/*
* fork_dialer - run a program to connect the serial device.
*/
void fork_dialer(char *program, int fd)
{
block_signals();
dial_pid = fork();
if (dial_pid < 0) {
unblock_signals();
syslog(LOG_ERR, "failed to fork dialer: %m");
/* FIXME: Probably this should not be fatal */
die(1);
}
if (dial_pid == 0) {
/* change the signal actions back to the defaults, then unblock them. */
default_sigacts();
unblock_signals();
/* make sure the child doesn't inherit any extra file descriptors */
close(proxy_mfd); /* close the master pty endpoint */
close(proxy_sfd); /* close the slave pty endpoint */
if (fifo_fd != -1) close(fifo_fd);
if (monitors) {
MONITORS *c = monitors;
while (c) {
close(c->fd);
c = c->next;
}
}
/* make sure the stdin and stdout get directed to the modem */
if (fd != 0) { dup2(fd, 0); close(fd); }
dup2(0, 1);
/* FIXME: direct the stderr to the console? */
dup2(0, 2);
setenv("MODEM",current_dev,1); /* set the current device */
if (fifoname) /* set the current command FIFO (if any) */
setenv("FIFO",fifoname,1);
execl("/bin/sh", "sh", "-c", program, (char *)0);
syslog(LOG_ERR, "could not exec /bin/sh: %m");
_exit(127);
/* NOTREACHED */
}
unblock_signals();
syslog(LOG_INFO,"Running connect (pid = %d).",dial_pid);
}
/*
* Open up a modem and set up the desired parameters.
*/
int open_modem()
{
int npgrpid;
int i;
/*
* Open the serial device and set it up.
*/
modem_hup = 0;
modem_fd = -1;
dial_status = 0;
/* JPD changed mode_dev so that we can use a connect script to get */
/* ipppd to dial. This allows us to use a connector program to get */
/* ipppd to dial and make sure that ipppd successfully connects to */
/* the ISP. Otherwise, we can't be sure that ipppd successfully */
/* connected and diald would show that we we're connected */
if (mode == MODE_DEV)
{
fork_connect(connector);
return 0;
}
if (req_pid) {
/* The user has specified a device. Use it, no search or lock needed. */
if ((modem_fd = open(req_dev, O_RDWR | O_NDELAY)) < 0) {
syslog(LOG_ERR,"Can't open requested device '%s'",req_dev);
killpg(req_pid,SIGKILL);
kill(req_pid,SIGKILL);
req_pid = 0;
dial_status = -1;
return 1;
}
current_dev = req_dev;
use_req=1;
} else {
for (i = 0; i < device_count; i++) {
current_dev = devices[(i+rotate_offset)%device_count];
/*
* March down the device list till we manage to open one up or
* we run out of devices to try.
*/
if (lock_dev && lock(current_dev) < 0)
continue;
/* OK. Locked one, try to open it */
if ((modem_fd = open(current_dev, O_RDWR | O_NDELAY)) >= 0)
break;
else {
syslog(LOG_ERR,"Error opening device %s: %m",current_dev);
}
current_dev = 0;
/* That didn't work, get rid of the lock */
if (lock_dev) unlock();
}
if (modem_fd < 0) {
syslog(LOG_INFO,"Couldn't find a free device to call out on.");
dial_status = -1;
return 2;
}
}
if (rotate_devices)
rotate_offset = (rotate_offset+1)%device_count;
/* Make sure we are the session leader */
if ((npgrpid = setsid()) >= 0)
pgrpid = npgrpid;
/* set device to be controlling tty */
/* This should only happen in SLIP mode */
if (mode == MODE_SLIP) {
if (ioctl(modem_fd, TIOCSCTTY, 1) < 0) {
syslog(LOG_ERR, "failed to set modem to controlling tty: %m");
die(1);
}
if (tcsetpgrp(modem_fd, pgrpid) < 0) {
syslog(LOG_ERR, "failed to set process group: %m");
die(1);
}
}
/* Get rid of any initial line noise */
tcflush(modem_fd, TCIOFLUSH);
if (tcgetattr(modem_fd, &inittermios) < 0) {
syslog(LOG_ERR, "failed to get initial modem terminal attributes: %m");
}
/* So we don't try to restore if we die before this */
restore_term = 1;
/* Clear the NDELAY flag now */
if (fcntl(modem_fd,F_SETFL,fcntl(modem_fd,F_GETFL)&~(O_NDELAY)) < 0)
syslog(LOG_ERR, "failed to clear O_NDELAY flag: %m"), die(1);
if (!req_pid) {
/* hang up and then start again */
set_up_tty(modem_fd, 1, 0);
sleep(1);
set_up_tty(modem_fd, 1, inspeed);
/* Get rid of any initial line noise after the hangup */
tcflush(modem_fd, TCIOFLUSH);
fork_dialer(connector, modem_fd);
} else {
/* someone else opened the line, we just set the mode */
set_up_tty(modem_fd, 0, inspeed);
}
return 0;
}
/*
* Reopen up a modem that closed on a sighup and set up the desired parameters.
*/
void reopen_modem()
{
int npgrpid;
if(debug&DEBUG_VERBOSE)
syslog(LOG_INFO,"Reopening modem device");
close(modem_fd);
sleep(1);
if ((modem_fd = open(current_dev, O_RDWR | O_NDELAY)) < 0) {
syslog(LOG_ERR,"Can't reopen device '%s'",current_dev);
} else {
/* Make sure we are the session leader */
if ((npgrpid = setsid()) >= 0)
pgrpid = npgrpid;
/* set device to be controlling tty */
/* This should only happen in SLIP mode */
if (mode == MODE_SLIP) {
if (ioctl(modem_fd, TIOCSCTTY, 1) < 0) {
syslog(LOG_ERR, "failed to set modem to controlling tty: %m");
die(1);
}
if (tcsetpgrp(modem_fd, pgrpid) < 0) {
syslog(LOG_ERR, "failed to set process group: %m");
die(1);
}
}
set_up_tty(modem_fd, 1, inspeed);
/* Clear the NDELAY flag now */
if (fcntl(modem_fd,F_SETFL,fcntl(modem_fd,F_GETFL)&~(O_NDELAY)) < 0)
syslog(LOG_ERR, "failed to clear O_NDELAY flag: %m"), die(1);
}
}
void finish_dial()
{
if (!req_pid)
set_up_tty(modem_fd, 0, inspeed);
}
/*
* Close the modem, making sure it hangs up properly!
*/
void close_modem()
{
if (mode == MODE_DEV) {
req_pid = 0;
modem_fd = -1 ;
return ;
}
if (debug&DEBUG_VERBOSE)
syslog(LOG_INFO,"Closing modem line.");
if (modem_fd < 0) {
return;
}
/* Get rid of what ever might be waiting to go out still */
tcflush(modem_fd, TCIOFLUSH);
/*
* Restore the initial termio settings.
*/
if (restore_term) {
tcsetattr(modem_fd, TCSANOW, &inittermios);
}
/*
* Hang up the modem up by dropping the DTR.
* We do this because the initial termio settings
* may not have set HUPCL. This forces the issue.
* We need the sleep to give the modem a chance to hang
* up before we get another program asserting the DTR.
*/
setdtr(modem_fd, 0);
sleep(1);
close(modem_fd);
if (use_req) {
if (debug&DEBUG_VERBOSE)
syslog(LOG_INFO, "Killing requesting shell pid %d",req_pid);
killpg(req_pid, SIGKILL);
kill(req_pid, SIGKILL);
req_pid = 0;
} else if (lock_dev) unlock();
modem_fd = -1;
}
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