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freebsd-dev/usr.sbin/ppp/modem.c
Brian Somers 687d0cdeb3 Remove the syslog stuff, and allow various return values 
in uu_lock().  Add uu_lockerr() for turning the results of
uu_lock into something printable.  Remove bogus section in man page
about race conditions allowing both processes to get the lock.
Include libutil.h and use uu_lock() correctly  where it should.

Suggested by:	ache@freebsd.org
1997-03-31 22:51:00 +00:00

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/*
* PPP Modem handling module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* 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 the Internet Initiative Japan, Inc. The name of the
* IIJ 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.
*
* $Id: modem.c,v 1.31 1997/03/10 06:54:58 ache Exp $
*
* TODO:
*/
#include "fsm.h"
#include <fcntl.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <errno.h>
#include <time.h>
#include <libutil.h>
#include "hdlc.h"
#include "lcp.h"
#include "ip.h"
#include "modem.h"
#include "vars.h"
#ifndef O_NONBLOCK
#ifdef O_NDELAY
#define O_NONBLOCK O_NDELAY
#endif
#endif
extern int DoChat();
static int mbits; /* Current DCD status */
static int connect_time; /* connection time */
static int connect_count;
static struct pppTimer ModemTimer;
static char uucplock[10];
extern void PacketMode(), TtyTermMode(), TtyCommandMode();
extern int TermMode;
#define Online (mbits & TIOCM_CD)
static struct mbuf *modemout;
static struct mqueue OutputQueues[PRI_LINK+1];
static int dev_is_modem;
#undef QDEBUG
void
Enqueue(queue, bp)
struct mqueue *queue;
struct mbuf *bp;
{
if (queue->last) {
queue->last->pnext = bp;
queue->last = bp;
} else
queue->last = queue->top = bp;
queue->qlen++;
#ifdef QDEBUG
logprintf("Enqueue: len = %d\n", queue->qlen);
#endif
}
struct mbuf *
Dequeue(queue)
struct mqueue *queue;
{
struct mbuf *bp;
#ifdef QDEBUG
logprintf("Dequeue: len = %d\n", queue->qlen);
#endif
bp = queue->top;
if (bp) {
queue->top = queue->top->pnext;
queue->qlen--;
if (queue->top == NULL) {
queue->last = queue->top;
#ifdef QDEBUG
if (queue->qlen)
logprintf("!!! not zero (%d)!!!\n", queue->qlen);
#endif
}
}
return(bp);
}
static struct speeds{
int nspeed;
speed_t speed;
} 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 B2400
{ 2400, B2400, },
#endif
#ifdef B4800
{ 4800, B4800, },
#endif
#ifdef B9600
{ 9600, B9600, },
#endif
#ifdef B19200
{ 19200, B19200, },
#endif
#ifdef B38400
{ 38400, B38400, },
#endif
#ifndef _POSIX_SOURCE
#ifdef B7200
{ 7200, B7200, },
#endif
#ifdef B14400
{ 14400, B14400, },
#endif
#ifdef B28800
{ 28800, B28800, },
#endif
#ifdef B57600
{ 57600, B57600, },
#endif
#ifdef B76800
{ 76800, B76800, },
#endif
#ifdef B115200
{ 115200, B115200, },
#endif
#ifdef B230400
{ 230400, B230400, },
#endif
#ifdef EXTA
{ 19200, EXTA, },
#endif
#ifdef EXTB
{ 38400, EXTB, },
#endif
#endif /*_POSIX_SOURCE */
{ 0, 0 }
};
int SpeedToInt(speed)
speed_t speed;
{
struct speeds *sp;
for (sp = speeds; sp->nspeed; sp++) {
if (sp->speed == speed) {
return(sp->nspeed);
}
}
return 0;
}
speed_t IntToSpeed(nspeed)
int nspeed;
{
struct speeds *sp;
for (sp = speeds; sp->nspeed; sp++) {
if (sp->nspeed == nspeed) {
return(sp->speed);
}
}
return B0;
}
static time_t uptime;
void
DownConnection()
{
LogPrintf(LOG_PHASE_BIT, "Disconnected!\n");
LogPrintf(LOG_PHASE_BIT, "Connect time: %d secs\n", time(NULL) - uptime);
if (!TermMode) {
CloseModem();
LcpDown();
}
connect_time = 0;
}
/*
* ModemTimeout() watches DCD signal and notifies if it's status is changed.
*
*/
void
ModemTimeout()
{
int ombits = mbits;
int change;
StopTimer(&ModemTimer);
if (Online)
connect_time++;
StartTimer(&ModemTimer);
if (dev_is_modem) {
ioctl(modem, TIOCMGET, &mbits);
change = ombits ^ mbits;
if (change & TIOCM_CD) {
if (Online) {
time(&uptime);
LogPrintf(LOG_PHASE_BIT, "*Connected!\n");
connect_count++;
/*
* In dedicated mode, start packet mode immediate
* after we detected carrier.
*/
if (mode & MODE_DEDICATED)
PacketMode();
} else {
DownConnection();
}
}
} else {
if (!Online) {
time(&uptime);
LogPrintf(LOG_PHASE_BIT, "Connected!\n");
mbits = TIOCM_CD;
connect_count++;
connect_time = 0;
} else if (uptime == 0) {
time(&uptime);
}
}
}
void
StartModemTimer()
{
connect_time = 0;
StopTimer(&ModemTimer);
ModemTimer.state = TIMER_STOPPED;
ModemTimer.load = SECTICKS;
ModemTimer.func = ModemTimeout;
StartTimer(&ModemTimer);
}
struct parity {
char *name;
char *name1;
int set;
} validparity[] = {
{ "even", "P_EVEN", CS7 | PARENB }, { "odd", "P_ODD", CS7 | PARENB | PARODD },
{ "none", "P_ZERO", CS8 }, { NULL, 0 },
};
int
GetParityValue(str)
char *str;
{
struct parity *pp;
for (pp = validparity; pp->name; pp++) {
if (strcasecmp(pp->name, str) == 0 ||
strcasecmp(pp->name1, str) == 0) {
VarParity = pp->set;
return(pp->set);
}
}
return(-1);
}
int
ChangeParity(str)
char *str;
{
struct termios rstio;
int val;
val = GetParityValue(str);
if (val > 0) {
VarParity = val;
tcgetattr(modem, &rstio);
rstio.c_cflag &= ~(CSIZE|PARODD|PARENB);
rstio.c_cflag |= val;
tcsetattr(modem, TCSADRAIN, &rstio);
}
return(val);
}
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
int
OpenConnection(host, port)
char *host, *port;
{
struct sockaddr_in dest;
int sock;
struct hostent *hp;
struct servent *sp;
dest.sin_family = AF_INET;
dest.sin_addr.s_addr = inet_addr(host);
if (dest.sin_addr.s_addr == INADDR_NONE) {
hp = gethostbyname(host);
if (hp) {
bcopy(hp->h_addr_list[0], &dest.sin_addr.s_addr, 4);
} else {
printf("unknown host: %s\n", host);
return(-1);
}
}
dest.sin_port = htons(atoi(port));
if (dest.sin_port == 0) {
sp = getservbyname(port, "tcp");
if (sp) {
dest.sin_port = sp->s_port;
} else {
printf("unknown service: %s\n", port);
return(-1);
}
}
LogPrintf(LOG_PHASE_BIT, "Connected to %s:%s\n", host, port);
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock < 0) {
return(sock);
}
if (connect(sock, (struct sockaddr *)&dest, sizeof(dest)) < 0) {
printf("connection failed.\n");
return(-1);
}
return(sock);
}
static struct termios modemios;
int
OpenModem(mode)
int mode;
{
struct termios rstio;
int oldflag;
char *host, *cp, *port;
int res;
mbits = 0;
if (mode & MODE_DIRECT) {
if (isatty(0)) {
modem = open(ctermid(NULL), O_RDWR|O_NONBLOCK);
if (modem < 0) {
LogPrintf(LOG_PHASE_BIT, "Open Failed %s\n", ctermid(NULL));
return(modem);
}
} else if (modem < 0)
return(modem);
} else if (modem < 0) {
if (strncmp(VarDevice, "/dev", 4) == 0) {
strncpy(uucplock, rindex(VarDevice, '/')+1,sizeof(uucplock)-1);
uucplock[sizeof(uucplock)-1] = '\0';
if ((res = uu_lock(uucplock)) != UU_LOCK_OK) {
if (res == UU_LOCK_INUSE)
LogPrintf(LOG_PHASE_BIT, "Modem %s is in use\n", VarDevice);
else
LogPrintf(LOG_PHASE_BIT, "Modem %s is in use: uu_lock: %s\n",
VarDevice, uu_lockerr(res));
return(-1);
}
modem = open(VarDevice, O_RDWR|O_NONBLOCK);
if (modem < 0) {
LogPrintf(LOG_PHASE_BIT, "Open Failed %s\n", VarDevice);
(void) uu_unlock(uucplock);
return(modem);
}
} else {
/* XXX: PPP over TCP */
cp = index(VarDevice, ':');
if (cp) {
*cp = 0;
host = VarDevice;
port = cp + 1;
if (*host && *port) {
modem = OpenConnection(host, port);
*cp = ':'; /* Don't destroy VarDevice */
if (modem < 0) return(-1);
} else {
*cp = ':'; /* Don't destroy VarDevice */
return(-1);
}
} else
return(-1);
}
}
/* This code gets around the problem of closing descriptor 0
* when it should not have been closed and closing descriptor 1
* when the telnet connection dies. Since this program always
* opens a descriptor for the modem in auto and direct mode,
* having to dup the descriptor here is a fatal error.
*
* With the other changes I have made this should no longer happen.
* JC
*/
while (modem < 3)
{
logprintf("Duping modem fd %d\n", modem);
modem = dup(modem);
}
/*
* If we are working on tty device, change it's mode into
* the one desired for further operation. In this implementation,
* we assume that modem is configuted to use CTS/RTS flow control.
*/
dev_is_modem = isatty(modem) || DEV_IS_SYNC;
if (DEV_IS_SYNC)
sleep(1);
if (dev_is_modem && !DEV_IS_SYNC) {
tcgetattr(modem, &rstio);
modemios = rstio;
#ifdef DEBUG
logprintf("## modem = %d\n", modem);
logprintf("modem (get): iflag = %x, oflag = %x, cflag = %x\n",
rstio.c_iflag, rstio.c_oflag, rstio.c_cflag);
#endif
cfmakeraw(&rstio);
if (VarCtsRts)
rstio.c_cflag |= CLOCAL | CCTS_OFLOW|CRTS_IFLOW;
else {
rstio.c_cflag |= CLOCAL;
rstio.c_iflag |= IXOFF;
}
rstio.c_iflag |= IXON;
if (!(mode & MODE_DEDICATED))
rstio.c_cflag |= HUPCL;
if ((mode & MODE_DIRECT) == 0) {
/*
* If we are working as direct mode, don't change tty speed.
*/
rstio.c_cflag &= ~(CSIZE|PARODD|PARENB);
rstio.c_cflag |= VarParity;
cfsetspeed(&rstio, IntToSpeed(VarSpeed));
}
tcsetattr(modem, TCSADRAIN, &rstio);
#ifdef DEBUG
logprintf("modem (put): iflag = %x, oflag = %x, cflag = %x\n",
rstio.c_iflag, rstio.c_oflag, rstio.c_cflag);
#endif
if (!(mode & MODE_DIRECT))
ioctl(modem, TIOCMGET, &mbits);
#ifdef DEBUG
fprintf(stderr, "modem control = %o\n", mbits);
#endif
oldflag = fcntl(modem, F_GETFL, 0);
fcntl(modem, F_SETFL, oldflag & ~O_NONBLOCK);
}
StartModemTimer();
return(modem);
}
int
ModemSpeed()
{
struct termios rstio;
tcgetattr(modem, &rstio);
return(SpeedToInt(cfgetispeed(&rstio)));
}
/*
* Put modem tty line into raw mode which is necessary in packet mode operation
*/
int
RawModem(modem)
int modem;
{
struct termios rstio;
int oldflag;
if (!isatty(modem) || DEV_IS_SYNC)
return(0);
if (!(mode & MODE_DIRECT) && modem >= 0 && !Online) {
#ifdef DEBUG
logprintf("mode = %d, modem = %d, mbits = %x\n", mode, modem, mbits);
#endif
#ifdef notdef
return(-1);
#endif
}
tcgetattr(modem, &rstio);
cfmakeraw(&rstio);
if (VarCtsRts)
rstio.c_cflag |= CLOCAL | CCTS_OFLOW|CRTS_IFLOW;
else
rstio.c_cflag |= CLOCAL;
if (!(mode & MODE_DEDICATED))
rstio.c_cflag |= HUPCL;
tcsetattr(modem, TCSADRAIN, &rstio);
oldflag = fcntl(modem, F_GETFL, 0);
fcntl(modem, F_SETFL, oldflag | O_NONBLOCK);
#ifdef DEBUG
oldflag = fcntl(modem, F_GETFL, 0);
logprintf("modem (put2): iflag = %x, oflag = %x, cflag = %x\n",
rstio.c_iflag, rstio.c_oflag, rstio.c_cflag);
logprintf("flag = %x\n", oldflag);
#endif
return(0);
}
void
UnrawModem(modem)
int modem;
{
int oldflag;
if (isatty(modem) && !DEV_IS_SYNC) {
tcsetattr(modem, TCSAFLUSH, &modemios);
oldflag = fcntl(modem, F_GETFL, 0);
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);
cfsetspeed(&tio, B0);
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(uucplock);
} 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(uucplock);
}
/*
* 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, i;
if (modemout == NULL && ModemQlen() == 0)
IpStartOutput();
if (modemout == NULL) {
i = PRI_LINK;
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;
}
i--;
}
}
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 = 0;
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(1);
} else {
if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER) {
fprintf(stderr, "login failed.\n");
excode = EX_NOLOGIN;
}
}
ModemTimeout(); /* Dummy call to check modem status */
}
else {
if ((mode & (MODE_INTER|MODE_AUTO)) == MODE_INTER) {
fprintf(stderr, "dial failed.\n");
excode = EX_NODIAL;
}
}
HangupModem(0);
if (mode & MODE_BACKGROUND) {
extern void Cleanup();
CloseModem();
Cleanup(excode);
}
return(0);
}
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
ioctl(modem, TIOCOUTQ, &nb);
printf("outq: %d\n", nb);
#endif
printf("outqlen: %d\n", ModemQlen());
printf("DialScript = %s\n", VarDialScript);
printf("LoginScript = %s\n", VarLoginScript);
printf("PhoneNumber(s) = %s\n", VarPhoneList);
return(1);
}
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