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301127fb0a
freebsd/usr.sbin/ppp/modem.c
Brian Somers 301127fb0a Don't allow accept/deny when it's not appropriate. 
Log PAP/CHAP users in utmp & wtmp, allowing it to
be avoided with "disable utmp"
1997-09-22 23:59:16 +00:00

936 lines
19 KiB
C
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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 1.56 1997/09/22 00:55:46 brian Exp $
*
* TODO:
*/
#include "fsm.h"
#include <fcntl.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <time.h>
#include <paths.h>
#include <utmp.h>
#ifdef __OpenBSD__
#include <util.h>
#else
#include <libutil.h>
#endif
#include "hdlc.h"
#include "lcp.h"
#include "ip.h"
#include "modem.h"
#include "loadalias.h"
#include "vars.h"
#include "command.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_count;
static struct pppTimer ModemTimer;
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;
void
Enqueue(struct mqueue * queue, struct mbuf * bp)
{
if (queue->last) {
queue->last->pnext = bp;
queue->last = bp;
} else
queue->last = queue->top = bp;
queue->qlen++;
LogPrintf(LogDEBUG, "Enqueue: len = %d\n", queue->qlen);
}
struct mbuf *
Dequeue(struct mqueue * queue)
{
struct mbuf *bp;
LogPrintf(LogDEBUG, "Dequeue: len = %d\n", queue->qlen);
bp = queue->top;
if (bp) {
queue->top = queue->top->pnext;
queue->qlen--;
if (queue->top == NULL) {
queue->last = queue->top;
if (queue->qlen)
LogPrintf(LogDEBUG, "Dequeue: Not zero (%d)!!!\n", queue->qlen);
}
}
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_t speed)
{
struct speeds *sp;
for (sp = speeds; sp->nspeed; sp++) {
if (sp->speed == speed) {
return (sp->nspeed);
}
}
return 0;
}
speed_t
IntToSpeed(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()
{
char ScriptBuffer[200];
LogPrintf(LogPHASE, "Disconnected!\n");
if (uptime)
LogPrintf(LogPHASE, "Connect time: %d secs\n", time(NULL) - uptime);
uptime = 0;
strcpy(ScriptBuffer, VarHangupScript); /* arrays are the same size */
DoChat(ScriptBuffer);
if (!TermMode) {
CloseModem();
LcpDown();
}
}
/*
* ModemTimeout() watches DCD signal and notifies if it's status is changed.
*
*/
void
ModemTimeout()
{
int ombits = mbits;
int change;
StopTimer(&ModemTimer);
StartTimer(&ModemTimer);
if (dev_is_modem) {
if (modem >= 0) {
if (ioctl(modem, TIOCMGET, &mbits) < 0) {
LogPrintf(LogPHASE, "ioctl error (%s)!\n", strerror(errno));
DownConnection();
return;
}
} else
mbits = 0;
change = ombits ^ mbits;
if (change & TIOCM_CD) {
if (Online) {
time(&uptime);
LogPrintf(LogPHASE, "*Connected!\n");
connect_count++;
/*
* In dedicated mode, start packet mode immediate after we detected
* carrier.
*/
if (mode & MODE_DEDICATED)
PacketMode();
} else {
reconnect(RECON_TRUE);
DownConnection();
}
}
} else if (!Online) {
/* mbits was set to zero in OpenModem() */
time(&uptime);
LogPrintf(LogPHASE, "Connected!\n");
mbits = TIOCM_CD;
connect_count++;
} else if (uptime == 0) {
time(&uptime);
}
}
void
StartModemTimer()
{
StopTimer(&ModemTimer);
ModemTimer.state = TIMER_STOPPED;
ModemTimer.load = SECTICKS;
ModemTimer.func = ModemTimeout;
LogPrintf(LogDEBUG, "ModemTimer using ModemTimeout() - %p\n", 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(char *str)
{
struct parity *pp;
for (pp = validparity; pp->name; pp++) {
if (strcasecmp(pp->name, str) == 0 ||
strcasecmp(pp->name1, str) == 0) {
return VarParity = pp->set;
}
}
return (-1);
}
int
ChangeParity(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 0;
}
LogPrintf(LogWARN, "ChangeParity: %s: Invalid parity\n", str);
return -1;
}
int
OpenConnection(char *host, char *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 {
LogPrintf(LogWARN, "OpenConnection: 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 {
LogPrintf(LogWARN, "OpenConnection: unknown service: %s\n", port);
return (-1);
}
}
LogPrintf(LogPHASE, "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) {
LogPrintf(LogWARN, "OpenConnection: connection failed.\n");
return (-1);
}
LogPrintf(LogDEBUG, "OpenConnection: modem fd is %d.\n", sock);
return (sock);
}
extern int tunno;
static char fn[MAXPATHLEN];
int
LockModem()
{
int res;
FILE *lockfile;
if (*VarDevice != '/')
return 0;
if ((res = uu_lock(VarBaseDevice)) != UU_LOCK_OK) {
if (res == UU_LOCK_INUSE)
LogPrintf(LogPHASE, "Modem %s is in use\n", VarDevice);
else
LogPrintf(LogPHASE, "Modem %s is in use: uu_lock: %s\n",
VarDevice, uu_lockerr(res));
return (-1);
}
snprintf(fn, sizeof fn, "%s%s.if", _PATH_VARRUN, VarBaseDevice);
(void) unlink(fn);
if ((lockfile = fopen(fn, "w")) != NULL) {
fprintf(lockfile, "tun%d\n", tunno);
fclose(lockfile);
} else
LogPrintf(LogALERT, "Warning: Can't create %s: %s\n", fn, strerror(errno));
return 0;
}
void
UnlockModem()
{
if (*VarDevice != '/')
return;
snprintf(fn, sizeof fn, "%s%s.if", _PATH_VARRUN, VarBaseDevice);
if (unlink(fn) == -1)
LogPrintf(LogALERT, "Warning: Can't remove %s: %s\n", fn, strerror(errno));
if (uu_unlock(VarBaseDevice) == -1)
LogPrintf(LogALERT, "Warning: Can't uu_unlock %s\n", fn);
}
static struct termios modemios;
int
OpenModem(int mode)
{
struct termios rstio;
int oldflag;
char *host, *cp, *port;
if (modem >= 0)
LogPrintf(LogDEBUG, "OpenModem: Modem is already open!\n");
/* We're going back into "term" mode */
else if (mode & MODE_DIRECT) {
if (isatty(0)) {
LogPrintf(LogDEBUG, "OpenModem(direct): Modem is a tty\n");
cp = ttyname(0);
SetVariable(0, 1, &cp, VAR_DEVICE);
if (LockModem() == -1) {
close(0);
return -1;
}
} else {
LogPrintf(LogDEBUG, "OpenModem(direct): Modem is not a tty\n");
SetVariable(0, 0, 0, VAR_DEVICE);
}
return modem = 0;
} else {
if (strncmp(VarDevice, "/dev/", 5) == 0) {
if (LockModem() == -1)
return (-1);
modem = open(VarDevice, O_RDWR | O_NONBLOCK);
if (modem < 0) {
LogPrintf(LogERROR, "OpenModem failed: %s: %s\n", VarDevice,
strerror(errno));
UnlockModem();
return (-1);
}
LogPrintf(LogDEBUG, "OpenModem: Modem is %s\n", VarDevice);
} 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);
LogPrintf(LogDEBUG, "OpenModem: Modem is socket %s\n", VarDevice);
} else {
*cp = ':'; /* Don't destroy VarDevice */
LogPrintf(LogERROR, "Invalid host:port: \"%s\"\n", VarDevice);
return (-1);
}
} else {
LogPrintf(LogERROR,
"Device (%s) must be in /dev or be a host:port pair\n",
VarDevice);
return (-1);
}
}
}
/*
* 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.
*/
mbits = 0;
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;
LogPrintf(LogDEBUG, "OpenModem: modem = %d\n", modem);
LogPrintf(LogDEBUG, "OpenModem: modem (get): iflag = %x, oflag = %x,"
" cflag = %x\n", rstio.c_iflag, rstio.c_oflag, rstio.c_cflag);
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;
if (cfsetspeed(&rstio, IntToSpeed(VarSpeed)) == -1) {
LogPrintf(LogWARN, "Unable to set modem speed (modem %d to %d)\n",
modem, VarSpeed);
}
}
tcsetattr(modem, TCSADRAIN, &rstio);
LogPrintf(LogDEBUG, "modem (put): iflag = %x, oflag = %x, cflag = %x\n",
rstio.c_iflag, rstio.c_oflag, rstio.c_cflag);
if (!(mode & MODE_DIRECT))
if (ioctl(modem, TIOCMGET, &mbits)) {
LogPrintf(LogERROR, "OpenModem: Cannot get modem status: %s\n",
strerror(errno));
CloseModem();
return (-1);
}
LogPrintf(LogDEBUG, "OpenModem: modem control = %o\n", mbits);
oldflag = fcntl(modem, F_GETFL, 0);
if (oldflag < 0) {
LogPrintf(LogERROR, "OpenModem: Cannot get modem flags: %s\n",
strerror(errno));
CloseModem();
return (-1);
}
(void) 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(int modem)
{
struct termios rstio;
int oldflag;
if (!isatty(modem) || DEV_IS_SYNC)
return (0);
if (!(mode & MODE_DIRECT) && modem >= 0 && !Online) {
LogPrintf(LogDEBUG, "RawModem: mode = %d, modem = %d, mbits = %x\n", mode, modem, mbits);
}
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);
if (oldflag < 0)
return (-1);
(void) fcntl(modem, F_SETFL, oldflag | O_NONBLOCK);
return (0);
}
void
UnrawModem(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(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(LogWARN, "Unable to set modem to speed 0\n");
}
tcsetattr(modem, TCSANOW, &tio);
#endif
sleep(1);
}
/*
* 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 == -1.
*/
if (modem >= 0) {
char ScriptBuffer[200];
strcpy(ScriptBuffer, VarHangupScript); /* arrays are the same size */
DoChat(ScriptBuffer);
tcflush(modem, TCIOFLUSH);
UnrawModem(modem);
CloseModem();
}
} else if (modem >= 0) {
char ScriptBuffer[200];
mbits |= TIOCM_DTR;
#ifndef notyet
ioctl(modem, TIOCMSET, &mbits);
#else
tcgetattr(modem, &ts);
cfsetspeed(&ts, IntToSpeed(VarSpeed));
tcsetattr(modem, TCSADRAIN, &ts);
#endif
strcpy(ScriptBuffer, VarHangupScript); /* arrays are the same size */
DoChat(ScriptBuffer);
}
}
void
CloseModem()
{
if (modem >= 0) {
close(modem);
if (Utmp) {
struct utmp ut;
strncpy(ut.ut_line, VarBaseDevice, sizeof(ut.ut_line)-1);
ut.ut_line[sizeof(ut.ut_line)-1] = '\0';
if (logout(ut.ut_line))
logwtmp(ut.ut_line, "", "");
else
LogPrintf(LogERROR, "CloseModem: No longer logged in on %s\n",
ut.ut_line);
Utmp = 0;
}
UnlockModem();
modem = -1;
}
}
/*
* Write to modem. Actualy, requested packets are queued, and goes out
* to the line when ModemStartOutput() is called.
*/
void
WriteModem(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(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(int fd)
{
struct mqueue *queue;
int nb, nw;
int 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);
if (LogIsKept(LogDEBUG)) {
if (i > PRI_NORMAL) {
struct mqueue *q;
q = &OutputQueues[0];
LogPrintf(LogDEBUG, "ModemStartOutput: Output from queue %d,"
" normal has %d\n", i, q->qlen);
}
LogPrintf(LogDEBUG, "ModemStartOutput: Dequeued %d\n", i);
}
break;
}
i--;
}
}
if (modemout) {
nb = modemout->cnt;
if (nb > 1600)
nb = 1600;
nw = write(fd, MBUF_CTOP(modemout), nb);
LogPrintf(LogDEBUG, "ModemStartOutput: wrote: %d(%d)\n", nw, nb);
LogDumpBuff(LogDEBUG, "ModemStartOutput: modem write",
MBUF_CTOP(modemout), nb);
if (nw > 0) {
modemout->cnt -= nw;
modemout->offset += nw;
if (modemout->cnt == 0) {
modemout = mbfree(modemout);
LogPrintf(LogDEBUG, "ModemStartOutput: mbfree\n");
}
} else if (nw < 0) {
if (errno != EAGAIN) {
LogPrintf(LogERROR, "modem write (%d): %s\n", modem, strerror(errno));
reconnect(RECON_TRUE);
DownConnection();
}
}
}
}
int
DialModem()
{
char ScriptBuffer[200];
int excode;
strncpy(ScriptBuffer, VarDialScript, sizeof(ScriptBuffer) - 1);
ScriptBuffer[sizeof(ScriptBuffer) - 1] = '\0';
if ((excode = DoChat(ScriptBuffer)) > 0) {
if (VarTerm)
fprintf(VarTerm, "dial OK!\n");
strncpy(ScriptBuffer, VarLoginScript, sizeof(ScriptBuffer) - 1);
if ((excode = DoChat(ScriptBuffer)) > 0) {
VarAltPhone = NULL;
if (VarTerm)
fprintf(VarTerm, "login OK!\n");
return EX_DONE;
} else if (excode == -1)
excode = EX_SIG;
else {
LogPrintf(LogWARN, "DialModem: login failed.\n");
excode = EX_NOLOGIN;
}
ModemTimeout(); /* Dummy call to check modem status */
} else if (excode == -1)
excode = EX_SIG;
else {
LogPrintf(LogWARN, "DialModem: dial failed.\n");
excode = EX_NODIAL;
}
HangupModem(0);
return (excode);
}
int
ShowModemStatus()
{
char *dev;
#ifdef TIOCOUTQ
int nb;
#endif
if (!VarTerm)
return 1;
dev = *VarDevice ? VarDevice : "network";
fprintf(VarTerm, "device: %s speed: ", dev);
if (DEV_IS_SYNC)
fprintf(VarTerm, "sync\n");
else
fprintf(VarTerm, "%d\n", VarSpeed);
switch (VarParity & CSIZE) {
case CS7:
fprintf(VarTerm, "cs7, ");
break;
case CS8:
fprintf(VarTerm, "cs8, ");
break;
}
if (VarParity & PARENB) {
if (VarParity & PARODD)
fprintf(VarTerm, "odd parity, ");
else
fprintf(VarTerm, "even parity, ");
} else
fprintf(VarTerm, "no parity, ");
fprintf(VarTerm, "CTS/RTS %s.\n", (VarCtsRts ? "on" : "off"));
if (LogIsKept(LogDEBUG))
fprintf(VarTerm, "fd = %d, modem control = %o\n", modem, mbits);
fprintf(VarTerm, "connect count: %d\n", connect_count);
#ifdef TIOCOUTQ
if (modem >= 0)
if (ioctl(modem, TIOCOUTQ, &nb) > 0)
fprintf(VarTerm, "outq: %d\n", nb);
else
fprintf(VarTerm, "outq: ioctl probe failed: %s\n", strerror(errno));
#endif
fprintf(VarTerm, "outqlen: %d\n", ModemQlen());
fprintf(VarTerm, "DialScript = %s\n", VarDialScript);
fprintf(VarTerm, "LoginScript = %s\n", VarLoginScript);
fprintf(VarTerm, "PhoneNumber(s) = %s\n", VarPhoneList);
return 0;
}
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