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freebsd-nq/usr.sbin/pppd/main.c

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Initial revision
1994-09-25 02:11:26 +00:00
/*
* main.c - Point-to-Point Protocol main module
*
* 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.
*/
#ifndef lint
static char rcsid[] = "$Id: main.c,v 1.13 1994/05/27 01:02:14 paulus Exp $";
#endif
#define SETSID
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <netdb.h>
#include <utmp.h>
#include <pwd.h>
#include <sys/wait.h>
/*
* If REQ_SYSOPTIONS is defined to 1, pppd will not run unless
* /etc/ppp/options exists.
*/
#ifndef REQ_SYSOPTIONS
#define REQ_SYSOPTIONS 1
#endif
#ifdef SGTTY
#include <sgtty.h>
#else
#ifndef sun
#include <sys/ioctl.h>
#endif
#include <termios.h>
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/if.h>
#include "callout.h"
#include "ppp.h"
#include "magic.h"
#include "fsm.h"
#include "lcp.h"
#include "ipcp.h"
#include "upap.h"
#include "chap.h"
#include "pppd.h"
#include "pathnames.h"
#include "patchlevel.h"
#ifndef TRUE
#define TRUE (1)
#endif /*TRUE*/
#ifndef FALSE
#define FALSE (0)
#endif /*FALSE*/
#ifdef PIDPATH
static char *pidpath = PIDPATH; /* filename in which pid will be stored */
#else
static char *pidpath = _PATH_PIDFILE;
#endif /* PIDFILE */
/* interface vars */
char ifname[IFNAMSIZ]; /* Interface name */
int ifunit; /* Interface unit number */
char *progname; /* Name of this program */
char hostname[MAXNAMELEN]; /* Our hostname */
char our_name[MAXNAMELEN];
char remote_name[MAXNAMELEN];
static char pidfilename[MAXPATHLEN];
static pid_t pid; /* Our pid */
static pid_t pgrpid; /* Process Group ID */
uid_t uid; /* Our real user-id */
char devname[MAXPATHLEN] = "/dev/tty"; /* Device name */
int default_device = TRUE; /* use default device (stdin/out) */
int fd = -1; /* Device file descriptor */
int s; /* Socket file descriptor */
int phase; /* where the link is at */
#ifdef SGTTY
static struct sgttyb initsgttyb; /* Initial TTY sgttyb */
#else
static struct termios inittermios; /* Initial TTY termios */
#endif
static int initfdflags = -1; /* Initial file descriptor flags */
static int restore_term; /* 1 => we've munged the terminal */
u_char outpacket_buf[MTU+DLLHEADERLEN]; /* buffer for outgoing packet */
static u_char inpacket_buf[MTU+DLLHEADERLEN]; /* buffer for incoming packet */
int hungup; /* terminal has been hung up */
static int n_children; /* # child processes still running */
/* configured variables */
int debug = 0; /* Debug flag */
int kdebugflag = 0; /* Kernel debugging flag */
char user[MAXNAMELEN]; /* username for PAP */
char passwd[MAXSECRETLEN]; /* password for PAP */
char *connector = NULL; /* "connect" command */
char *disconnector = NULL; /* "disconnect" command */
int inspeed = 0; /* Input/Output speed requested */
int baud_rate; /* bits/sec currently used */
u_long netmask = 0; /* netmask to use on ppp interface */
int crtscts = 0; /* use h/w flow control */
int nodetach = 0; /* don't fork */
int modem = 0; /* use modem control lines */
int auth_required = 0; /* require peer to authenticate */
int defaultroute = 0; /* assign default route through interface */
int proxyarp = 0; /* set entry in arp table */
int persist = 0; /* re-initiate on termination */
int answer = 0; /* wait for incoming call */
int uselogin = 0; /* check PAP info against /etc/passwd */
int lockflag = 0; /* lock the serial device */
/* prototypes */
static void hup __ARGS((int));
static void intr __ARGS((int));
static void term __ARGS((int));
static void alrm __ARGS((int));
static void io __ARGS((int));
static void chld __ARGS((int));
static void incdebug __ARGS((int));
static void nodebug __ARGS((int));
void establish_ppp __ARGS((void));
void reap_kids __ARGS((void));
void cleanup __ARGS((int, caddr_t));
void die __ARGS((int));
void novm __ARGS((char *));
void log_packet __ARGS((u_char *, int, char *));
void format_packet __ARGS((u_char *, int,
void (*) (void *, char *, ...), void *));
void pr_log __ARGS((void *, char *, ...));
extern char *ttyname __ARGS((int));
extern char *getlogin __ARGS((void));
/*
* PPP Data Link Layer "protocol" table.
* One entry per supported protocol.
*/
static struct protent {
u_short protocol;
void (*init)();
void (*input)();
void (*protrej)();
int (*printpkt)();
char *name;
} prottbl[] = {
{ LCP, lcp_init, lcp_input, lcp_protrej, lcp_printpkt, "LCP" },
{ IPCP, ipcp_init, ipcp_input, ipcp_protrej, ipcp_printpkt, "IPCP" },
{ UPAP, upap_init, upap_input, upap_protrej, upap_printpkt, "PAP" },
{ CHAP, ChapInit, ChapInput, ChapProtocolReject, ChapPrintPkt, "CHAP" },
};
#define N_PROTO (sizeof(prottbl) / sizeof(prottbl[0]))
main(argc, argv)
int argc;
char *argv[];
{
int mask, i;
struct sigaction sa;
struct cmd *cmdp;
FILE *pidfile;
char *p;
struct passwd *pw;
p = ttyname(0);
if (p)
strcpy(devname, p);
if (gethostname(hostname, MAXNAMELEN) < 0 ) {
perror("couldn't get hostname");
die(1);
}
hostname[MAXNAMELEN-1] = 0;
pid = getpid();
uid = getuid();
if (!ppp_available()) {
fprintf(stderr, "Sorry - PPP is not available on this system\n");
exit(1);
}
/*
* Initialize to the standard option set, then parse, in order,
* the system options file, the user's options file, and the command
* line arguments.
*/
for (i = 0; i < N_PROTO; i++)
(*prottbl[i].init)(0);
progname = *argv;
if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0) ||
!options_from_user() ||
!parse_args(argc-1, argv+1) ||
!options_for_tty())
die(1);
check_auth_options();
setipdefault();
/*
* Initialize syslog system and magic number package.
*/
#if !defined(ultrix)
openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
setlogmask(LOG_UPTO(LOG_INFO));
#else
openlog("pppd", LOG_PID);
#define LOG_UPTO(x) (x)
#define setlogmask(x) (x)
#endif
if (debug)
setlogmask(LOG_UPTO(LOG_DEBUG));
magic_init();
p = getlogin();
if (p == NULL) {
pw = getpwuid(uid);
if (pw != NULL && pw->pw_name != NULL)
p = pw->pw_name;
else
p = "(unknown)";
}
syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
VERSION, PATCHLEVEL, p, uid);
#ifdef SETSID
/*
* Make sure we can set the serial device to be our controlling terminal.
*/
if (default_device) {
/*
* No device name was specified:
* we are in the device's session already.
*/
if ((pgrpid = getpgrp(0)) < 0) {
syslog(LOG_ERR, "getpgrp(0): %m");
die(1);
}
} else {
/*
* Not default device: make sure we're not a process group leader,
* then become session leader of a new session (so we can make
* our device its controlling terminal and thus get SIGHUPs).
*/
if (!nodetach) {
/* fork so we're not a process group leader */
if (pid = fork()) {
exit(0); /* parent is finished */
}
if (pid < 0) {
syslog(LOG_ERR, "fork: %m");
die(1);
}
pid = getpid(); /* otherwise pid is 0 in child */
} else {
/*
* try to put ourself into our parent's process group,
* so we're not a process group leader
*/
if (setpgrp(pid, getppid()) < 0)
syslog(LOG_WARNING, "setpgrp: %m");
}
/* create new session */
if ((pgrpid = setsid()) < 0) {
syslog(LOG_ERR, "setsid(): %m");
die(1);
}
}
#endif
if (lockflag && !default_device)
if (lock(devname) < 0)
die(1);
/* Get an internet socket for doing socket ioctl's on. */
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "socket : %m");
die(1);
}
/*
* Compute mask of all interesting signals and install signal handlers
* for each. Only one signal handler may be active at a time. Therefore,
* all other signals should be masked when any handler is executing.
*/
sigemptyset(&mask);
sigaddset(&mask, SIGHUP);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGALRM);
sigaddset(&mask, SIGIO);
sigaddset(&mask, SIGCHLD);
#ifdef STREAMS
sigaddset(&mask, SIGPOLL);
#endif
#define SIGNAL(s, handler) { \
sa.sa_handler = handler; \
if (sigaction(s, &sa, NULL) < 0) { \
syslog(LOG_ERR, "sigaction(%d): %m", s); \
die(1); \
} \
}
sa.sa_mask = mask;
sa.sa_flags = 0;
SIGNAL(SIGHUP, hup); /* Hangup */
SIGNAL(SIGINT, intr); /* Interrupt */
SIGNAL(SIGTERM, term); /* Terminate */
SIGNAL(SIGALRM, alrm); /* Timeout */
SIGNAL(SIGIO, io); /* Input available */
SIGNAL(SIGCHLD, chld); /* Death of child process */
#ifdef STREAMS
SIGNAL(SIGPOLL, io); /* Input available */
#endif
signal(SIGUSR1, incdebug); /* Increment debug flag */
signal(SIGUSR2, nodebug); /* Reset debug flag */
/*
* Block SIGIOs and SIGPOLLs for now
*/
sigemptyset(&mask);
sigaddset(&mask, SIGIO);
#ifdef STREAMS
sigaddset(&mask, SIGPOLL);
#endif
sigprocmask(SIG_BLOCK, &mask, NULL);
/*
* Open the serial device and set it up to be the ppp interface.
*/
if ((fd = open(devname, O_RDWR /*| O_NDELAY*/)) < 0) {
syslog(LOG_ERR, "open(%s): %m", devname);
die(1);
}
hungup = 0;
#ifdef TIOCSCTTY
/* set device to be controlling tty */
if (!default_device && ioctl(fd, TIOCSCTTY) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSCTTY): %m");
die(1);
}
#endif /* TIOCSCTTY */
/* run connection script */
if (connector) {
MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
/* set line speed, flow control, etc.; set CLOCAL for now */
set_up_tty(fd, 1);
/* drop dtr to hang up in case modem is off hook */
if (!default_device && modem) {
setdtr(fd, FALSE);
sleep(1);
setdtr(fd, TRUE);
}
if (device_script(connector, fd, fd) < 0) {
syslog(LOG_ERR, "could not set up connection");
setdtr(fd, FALSE);
die(1);
}
syslog(LOG_INFO, "Connected...");
sleep(1); /* give it time to set up its terminal */
}
/* set line speed, flow control, etc.; clear CLOCAL if modem option */
set_up_tty(fd, 0);
/* set up the serial device as a ppp interface */
establish_ppp();
syslog(LOG_INFO, "Using interface ppp%d", ifunit);
(void) sprintf(ifname, "ppp%d", ifunit);
/* write pid to file */
(void) sprintf(pidfilename, "%s/%s.pid", pidpath, ifname);
if ((pidfile = fopen(pidfilename, "w")) != NULL) {
fprintf(pidfile, "%d\n", pid);
(void) fclose(pidfile);
} else {
syslog(LOG_ERR, "unable to create pid file: %m");
pidfilename[0] = 0;
}
/*
* Set process group of device to our process group so we can get
* SIGIOs and SIGHUPs.
*/
#ifdef SETSID
if (default_device) {
int id = tcgetpgrp(fd);
if (id != pgrpid) {
syslog(LOG_WARNING, "warning: not in tty's process group");
}
} else {
if (tcsetpgrp(fd, pgrpid) < 0) {
syslog(LOG_ERR, "tcsetpgrp(): %m");
die(1);
}
}
#else
/* set process group on tty so we get SIGIO's */
if (ioctl(fd, TIOCSPGRP, &pgrpid) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSPGRP): %m");
die(1);
}
#endif
/*
* Record initial device flags, then set device to cause SIGIO
* signals to be generated.
*/
if ((initfdflags = fcntl(fd, F_GETFL)) == -1) {
syslog(LOG_ERR, "fcntl(F_GETFL): %m");
die(1);
}
#ifdef _linux_ /* This is a kludge for Linux. FIXME !!! -- later. */
#undef FASYNC
#define FASYNC 0
#endif
if (fcntl(fd, F_SETFL, FNDELAY | FASYNC) == -1) {
syslog(LOG_ERR, "fcntl(F_SETFL, FNDELAY | FASYNC): %m");
die(1);
}
/*
* Block all signals, start opening the connection, and wait for
* incoming signals (reply, timeout, etc.).
*/
syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devname);
sigprocmask(SIG_BLOCK, &mask, NULL); /* Block signals now */
lcp_lowerup(0); /* XXX Well, sort of... */
lcp_open(0); /* Start protocol */
for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; )
sigpause(0); /* Wait for next signal */
/*
* Run disconnector script, if requested
*/
if (disconnector) {
if (device_script(disconnector, fd, fd) < 0) {
syslog(LOG_WARNING, "disconnect script failed");
die(1);
}
syslog(LOG_INFO, "Disconnected...");
}
quit();
}
#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)
#define baud_rate_of(speed) (speed)
#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
{ 0, 0 }
};
/*
* Translate from bits/second to a speed_t.
*/
int
translate_speed(bps)
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;
}
/*
* Translate from a speed_t to bits/second.
*/
int
baud_rate_of(speed)
int speed;
{
struct speed *speedp;
if (speed == 0)
return 0;
for (speedp = speeds; speedp->speed_int; speedp++)
if (speed == speedp->speed_val)
return speedp->speed_int;
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.
*/
set_up_tty(fd, local)
int fd, local;
{
#ifndef SGTTY
int speed, x;
struct termios tios;
if (tcgetattr(fd, &tios) < 0) {
syslog(LOG_ERR, "tcgetattr: %m");
die(1);
}
if (!restore_term)
inittermios = tios;
#ifdef CRTSCTS
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL | CRTSCTS);
if (crtscts == 1)
tios.c_cflag |= CRTSCTS;
#else
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
#endif /* CRTSCTS */
tios.c_cflag |= CS8 | CREAD | HUPCL;
if (local || !modem)
tios.c_cflag |= CLOCAL;
tios.c_iflag = IGNBRK | IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
if (crtscts == 2) {
tios.c_iflag |= IXOFF;
tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
}
speed = translate_speed(inspeed);
if (speed) {
cfsetospeed(&tios, speed);
cfsetispeed(&tios, speed);
} else {
speed = cfgetospeed(&tios);
}
if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
syslog(LOG_ERR, "tcsetattr: %m");
die(1);
}
#ifdef ultrix
x = 0;
if (ioctl(fd, (crtscts || modem)? TIOCMODEM: TIOCNMODEM, &x) < 0)
syslog(LOG_WARNING, "TIOC(N)MODEM: %m");
if (ioctl(fd, (local || !modem)? TIOCNCAR: TIOCCAR) < 0)
syslog(LOG_WARNING, "TIOC(N)CAR: %m");
#endif
#else /* SGTTY */
int speed;
struct sgttyb sgttyb;
/*
* Put the tty in raw mode.
*/
if (ioctl(fd, TIOCGETP, &sgttyb) < 0) {
syslog(LOG_ERR, "ioctl(TIOCGETP): %m");
die(1);
}
if (!restore_term)
initsgttyb = sgttyb;
sgttyb.sg_flags = RAW | ANYP;
speed = translate_speed(inspeed);
if (speed)
sgttyb.sg_ispeed = speed;
else
speed = sgttyb.sg_ispeed;
if (ioctl(fd, TIOCSETP, &sgttyb) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSETP): %m");
die(1);
}
#endif
baud_rate = baud_rate_of(speed);
restore_term = TRUE;
}
/*
* setdtr - control the DTR line on the serial port.
* This is called from die(), so it shouldn't call die().
*/
setdtr(fd, on)
int fd, on;
{
int modembits = TIOCM_DTR;
ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
}
/*
* quit - Clean up state and exit.
*/
void
quit()
{
die(0);
}
/*
* die - like quit, except we can specify an exit status.
*/
void
die(status)
int status;
{
cleanup(0, NULL);
syslog(LOG_INFO, "Exit.");
exit(status);
}
/*
* cleanup - restore anything which needs to be restored before we exit
*/
/* ARGSUSED */
void
cleanup(status, arg)
int status;
caddr_t arg;
{
if (fd >= 0) {
/* drop dtr to hang up */
if (modem)
setdtr(fd, FALSE);
if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
syslog(LOG_WARNING, "fcntl(F_SETFL, fdflags): %m");
initfdflags = -1;
disestablish_ppp();
if (restore_term) {
#ifndef SGTTY
if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
syslog(LOG_WARNING, "tcsetattr: %m");
#else
if (ioctl(fd, TIOCSETP, &initsgttyb) < 0)
syslog(LOG_WARNING, "ioctl(TIOCSETP): %m");
#endif
}
close(fd);
fd = -1;
}
if (pidfilename[0] != 0 && unlink(pidfilename) < 0)
syslog(LOG_WARNING, "unable to unlink pid file: %m");
pidfilename[0] = 0;
if (lockflag && !default_device)
unlock();
}
static struct callout *callout = NULL; /* Callout list */
static struct timeval schedtime; /* Time last timeout was set */
/*
* timeout - Schedule a timeout.
*
* Note that this timeout takes the number of seconds, NOT hz (as in
* the kernel).
*/
void
timeout(func, arg, time)
void (*func)();
caddr_t arg;
int time;
{
struct itimerval itv;
struct callout *newp, **oldpp;
MAINDEBUG((LOG_DEBUG, "Timeout %x:%x in %d seconds.",
(int) func, (int) arg, time));
/*
* Allocate timeout.
*/
if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
syslog(LOG_ERR, "Out of memory in timeout()!");
die(1);
}
newp->c_arg = arg;
newp->c_func = func;
/*
* Find correct place to link it in and decrement its time by the
* amount of time used by preceding timeouts.
*/
for (oldpp = &callout;
*oldpp && (*oldpp)->c_time <= time;
oldpp = &(*oldpp)->c_next)
time -= (*oldpp)->c_time;
newp->c_time = time;
newp->c_next = *oldpp;
if (*oldpp)
(*oldpp)->c_time -= time;
*oldpp = newp;
/*
* If this is now the first callout then we have to set a new
* itimer.
*/
if (callout == newp) {
itv.it_interval.tv_sec = itv.it_interval.tv_usec =
itv.it_value.tv_usec = 0;
itv.it_value.tv_sec = callout->c_time;
MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in timeout.",
itv.it_value.tv_sec));
if (setitimer(ITIMER_REAL, &itv, NULL)) {
syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
die(1);
}
if (gettimeofday(&schedtime, NULL)) {
syslog(LOG_ERR, "gettimeofday: %m");
die(1);
}
}
}
/*
* untimeout - Unschedule a timeout.
*/
void
untimeout(func, arg)
void (*func)();
caddr_t arg;
{
struct itimerval itv;
struct callout **copp, *freep;
int reschedule = 0;
MAINDEBUG((LOG_DEBUG, "Untimeout %x:%x.", (int) func, (int) arg));
/*
* If the first callout is unscheduled then we have to set a new
* itimer.
*/
if (callout &&
callout->c_func == func &&
callout->c_arg == arg)
reschedule = 1;
/*
* Find first matching timeout. Add its time to the next timeouts
* time.
*/
for (copp = &callout; *copp; copp = &(*copp)->c_next)
if ((*copp)->c_func == func &&
(*copp)->c_arg == arg) {
freep = *copp;
*copp = freep->c_next;
if (*copp)
(*copp)->c_time += freep->c_time;
(void) free((char *) freep);
break;
}
if (reschedule) {
itv.it_interval.tv_sec = itv.it_interval.tv_usec =
itv.it_value.tv_usec = 0;
itv.it_value.tv_sec = callout ? callout->c_time : 0;
MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in untimeout.",
itv.it_value.tv_sec));
if (setitimer(ITIMER_REAL, &itv, NULL)) {
syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
die(1);
}
if (gettimeofday(&schedtime, NULL)) {
syslog(LOG_ERR, "gettimeofday: %m");
die(1);
}
}
}
/*
* adjtimeout - Decrement the first timeout by the amount of time since
* it was scheduled.
*/
void
adjtimeout()
{
struct timeval tv;
int timediff;
if (callout == NULL)
return;
/*
* Make sure that the clock hasn't been warped dramatically.
* Account for recently expired, but blocked timer by adding
* small fudge factor.
*/
if (gettimeofday(&tv, NULL)) {
syslog(LOG_ERR, "gettimeofday: %m");
die(1);
}
timediff = tv.tv_sec - schedtime.tv_sec;
if (timediff < 0 ||
timediff > callout->c_time + 1)
return;
callout->c_time -= timediff; /* OK, Adjust time */
}
/*
* hup - Catch SIGHUP signal.
*
* Indicates that the physical layer has been disconnected.
*/
static void
hup(sig)
int sig;
{
syslog(LOG_INFO, "Hangup (SIGHUP)");
hungup = 1; /* they hung up on us! */
persist = 0; /* don't try to restart */
adjtimeout(); /* Adjust timeouts */
lcp_lowerdown(0); /* Reset connection */
quit(); /* and die */
}
/*
* term - Catch SIGTERM signal.
*
* Indicates that we should initiate a graceful disconnect and exit.
*/
static void
term(sig)
int sig;
{
syslog(LOG_INFO, "Terminating link.");
persist = 0; /* don't try to restart */
adjtimeout(); /* Adjust timeouts */
lcp_close(0); /* Close connection */
}
/*
* intr - Catch SIGINT signal (DEL/^C).
*
* Indicates that we should initiate a graceful disconnect and exit.
*/
static void
intr(sig)
int sig;
{
syslog(LOG_INFO, "Interrupt received: terminating link");
persist = 0; /* don't try to restart */
adjtimeout(); /* Adjust timeouts */
lcp_close(0); /* Close connection */
}
/*
* alrm - Catch SIGALRM signal.
*
* Indicates a timeout.
*/
static void
alrm(sig)
int sig;
{
struct itimerval itv;
struct callout *freep, *list, *last;
MAINDEBUG((LOG_DEBUG, "Alarm"));
if (callout == NULL)
return;
/*
* Get the first scheduled timeout and any that were scheduled
* for the same time as a list, and remove them all from callout
* list.
*/
list = last = callout;
while (last->c_next != NULL && last->c_next->c_time == 0)
last = last->c_next;
callout = last->c_next;
last->c_next = NULL;
/*
* Set a new itimer if there are more timeouts scheduled.
*/
if (callout) {
itv.it_interval.tv_sec = itv.it_interval.tv_usec = 0;
itv.it_value.tv_usec = 0;
itv.it_value.tv_sec = callout->c_time;
MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in alrm.",
itv.it_value.tv_sec));
if (setitimer(ITIMER_REAL, &itv, NULL)) {
syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
die(1);
}
if (gettimeofday(&schedtime, NULL)) {
syslog(LOG_ERR, "gettimeofday: %m");
die(1);
}
}
/*
* Now call all the timeout routines scheduled for this time.
*/
while (list) {
(*list->c_func)(list->c_arg);
freep = list;
list = list->c_next;
(void) free((char *) freep);
}
}
/*
* chld - Catch SIGCHLD signal.
* Calls reap_kids to get status for any dead kids.
*/
static void
chld(sig)
int sig;
{
reap_kids();
}
/*
* io - Catch SIGIO signal.
*
* Indicates that incoming data is available.
*/
static void
io(sig)
int sig;
{
int len, i;
u_char *p;
u_short protocol;
fd_set fdset;
struct timeval notime;
int ready;
MAINDEBUG((LOG_DEBUG, "IO signal received"));
adjtimeout(); /* Adjust timeouts */
/* Yup, this is for real */
for (;;) { /* Read all available packets */
p = inpacket_buf; /* point to beginning of packet buffer */
len = read_packet(inpacket_buf);
if (len < 0)
return;
if (len == 0) {
MAINDEBUG((LOG_DEBUG, "End of file on fd!"));
lcp_lowerdown(0);
return;
}
if (debug /*&& (debugflags & DBG_INPACKET)*/)
log_packet(p, len, "rcvd ");
if (len < DLLHEADERLEN) {
MAINDEBUG((LOG_INFO, "io(): Received short packet."));
return;
}
p += 2; /* Skip address and control */
GETSHORT(protocol, p);
len -= DLLHEADERLEN;
/*
* Toss all non-LCP packets unless LCP is OPEN.
*/
if (protocol != LCP && lcp_fsm[0].state != OPENED) {
MAINDEBUG((LOG_INFO,
"io(): Received non-LCP packet when LCP not open."));
return;
}
/*
* Upcall the proper protocol input routine.
*/
for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
if (prottbl[i].protocol == protocol) {
(*prottbl[i].input)(0, p, len);
break;
}
if (i == sizeof (prottbl) / sizeof (struct protent)) {
syslog(LOG_WARNING, "input: Unknown protocol (%x) received!",
protocol);
lcp_sprotrej(0, p - DLLHEADERLEN, len + DLLHEADERLEN);
}
}
}
/*
* demuxprotrej - Demultiplex a Protocol-Reject.
*/
void
demuxprotrej(unit, protocol)
int unit;
u_short protocol;
{
int i;
/*
* Upcall the proper Protocol-Reject routine.
*/
for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
if (prottbl[i].protocol == protocol) {
(*prottbl[i].protrej)(unit);
return;
}
syslog(LOG_WARNING,
"demuxprotrej: Unrecognized Protocol-Reject for protocol %d!",
protocol);
}
/*
* incdebug - Catch SIGUSR1 signal.
*
* Increment debug flag.
*/
/*ARGSUSED*/
static void
incdebug(sig)
int sig;
{
syslog(LOG_INFO, "Debug turned ON, Level %d", debug);
setlogmask(LOG_UPTO(LOG_DEBUG));
debug++;
}
/*
* nodebug - Catch SIGUSR2 signal.
*
* Turn off debugging.
*/
/*ARGSUSED*/
static void
nodebug(sig)
int sig;
{
setlogmask(LOG_UPTO(LOG_WARNING));
debug = 0;
}
/*
* device_script - run a program to connect or disconnect the
* serial device.
*/
int
device_script(program, in, out)
char *program;
int in, out;
{
int pid;
int status;
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGHUP);
sigprocmask(SIG_BLOCK, &mask, &mask);
pid = fork();
if (pid < 0) {
syslog(LOG_ERR, "fork: %m");
die(1);
}
if (pid == 0) {
setreuid(getuid(), getuid());
setregid(getgid(), getgid());
sigprocmask(SIG_SETMASK, &mask, NULL);
dup2(in, 0);
dup2(out, 1);
execl("/bin/sh", "sh", "-c", program, (char *)0);
syslog(LOG_ERR, "could not exec /bin/sh: %m");
_exit(99);
/* NOTREACHED */
}
while (waitpid(pid, &status, 0) < 0) {
if (errno == EINTR)
continue;
syslog(LOG_ERR, "waiting for (dis)connection process: %m");
die(1);
}
sigprocmask(SIG_SETMASK, &mask, NULL);
return (status == 0 ? 0 : -1);
}
/*
* run-program - execute a program with given arguments,
* but don't wait for it.
* If the program can't be executed, logs an error unless
* must_exist is 0 and the program file doesn't exist.
*/
int
run_program(prog, args, must_exist)
char *prog;
char **args;
int must_exist;
{
int pid;
pid = fork();
if (pid == -1) {
syslog(LOG_ERR, "can't fork to run %s: %m", prog);
return -1;
}
if (pid == 0) {
execv(prog, args);
if (must_exist || errno != ENOENT)
syslog(LOG_WARNING, "can't execute %s: %m", prog);
_exit(-1);
}
MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
++n_children;
return 0;
}
/*
* reap_kids - get status from any dead child processes,
* and log a message for abnormal terminations.
*/
void
reap_kids()
{
int pid, status;
if (n_children == 0)
return;
if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
if (errno != ECHILD)
syslog(LOG_ERR, "waitpid: %m");
return;
}
if (pid > 0) {
--n_children;
if (WIFSIGNALED(status)) {
syslog(LOG_WARNING, "child process %d terminated with signal %d",
pid, WTERMSIG(status));
}
}
}
/*
* log_packet - format a packet and log it.
*/
char line[256]; /* line to be logged accumulated here */
char *linep;
void
log_packet(p, len, prefix)
u_char *p;
int len;
char *prefix;
{
strcpy(line, prefix);
linep = line + strlen(line);
format_packet(p, len, pr_log, NULL);
if (linep != line)
syslog(LOG_DEBUG, "%s", line);
}
/*
* format_packet - make a readable representation of a packet,
* calling `printer(arg, format, ...)' to output it.
*/
void
format_packet(p, len, printer, arg)
u_char *p;
int len;
void (*printer) __ARGS((void *, char *, ...));
void *arg;
{
int i, n;
u_short proto;
u_char x;
if (len >= DLLHEADERLEN && p[0] == ALLSTATIONS && p[1] == UI) {
p += 2;
GETSHORT(proto, p);
len -= DLLHEADERLEN;
for (i = 0; i < N_PROTO; ++i)
if (proto == prottbl[i].protocol)
break;
if (i < N_PROTO) {
printer(arg, "[%s", prottbl[i].name);
n = (*prottbl[i].printpkt)(p, len, printer, arg);
printer(arg, "]");
p += n;
len -= n;
} else {
printer(arg, "[proto=0x%x]", proto);
}
}
for (; len > 0; --len) {
GETCHAR(x, p);
printer(arg, " %.2x", x);
}
}
#ifdef __STDC__
#include <stdarg.h>
void
pr_log(void *arg, char *fmt, ...)
{
int n;
va_list pvar;
char buf[256];
va_start(pvar, fmt);
vsprintf(buf, fmt, pvar);
va_end(pvar);
n = strlen(buf);
if (linep + n + 1 > line + sizeof(line)) {
syslog(LOG_DEBUG, "%s", line);
linep = line;
}
strcpy(linep, buf);
linep += n;
}
#else /* __STDC__ */
#include <varargs.h>
void
pr_log(arg, fmt, va_alist)
void *arg;
char *fmt;
va_dcl
{
int n;
va_list pvar;
char buf[256];
va_start(pvar);
vsprintf(buf, fmt, pvar);
va_end(pvar);
n = strlen(buf);
if (linep + n + 1 > line + sizeof(line)) {
syslog(LOG_DEBUG, "%s", line);
linep = line;
}
strcpy(linep, buf);
linep += n;
}
#endif
/*
* print_string - print a readable representation of a string using
* printer.
*/
void
print_string(p, len, printer, arg)
char *p;
int len;
void (*printer) __ARGS((void *, char *, ...));
void *arg;
{
int c;
printer(arg, "\"");
for (; len > 0; --len) {
c = *p++;
if (' ' <= c && c <= '~')
printer(arg, "%c", c);
else
printer(arg, "\\%.3o", c);
}
printer(arg, "\"");
}
/*
* novm - log an error message saying we ran out of memory, and die.
*/
void
novm(msg)
char *msg;
{
syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
die(1);
}
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