sys-next.c

unix and linux net driver

     * Scan through the system's network interfaces.
     */
    ifc.ifc_len = sizeof(ifs);
    ifc.ifc_req = ifs;
    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
	warn("ioctl(SIOCGIFCONF): %m");
	return mask;
    }
    ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
    for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
	 	((char *)&ifr->ifr_addr + sizeof(struct sockaddr))) {
	/*
	 * Check the interface's internet address.
	 */
	if (ifr->ifr_addr.sa_family != AF_INET)
	    continue;
	ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
	if ((ntohl(ina) & nmask) != (addr & nmask))
	    continue;
	/*
	 * Check that the interface is up, and not point-to-point or loopback.
	 */
	strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
	if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
	    continue;
	if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
	    != IFF_UP)
	    continue;
	/*
	 * Get its netmask and OR it into our mask.
	 */
	if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
	    continue;
	mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
    }

    return mask;
}

/*
 * have_route_to - determine if the system has any route to
 * a given IP address.
 * For demand mode to work properly, we have to ignore routes
 * through our own interface.
 */
int have_route_to(u_int32_t addr)
{
    return -1;
}

#if 0
/*
 * daemon - Detach us from the terminal session.
 */
int
daemon(nochdir, noclose)
    int nochdir, noclose;
{
    int pid;

    if ((pid = fork()) < 0)
	return -1;
    if (pid != 0)
	exit(0);		/* parent dies */
    (void)setsid();
    if (!nochdir)
	chdir("/");
    if (!noclose) {
	fclose(stdin);		/* don't need stdin, stdout, stderr */
	fclose(stdout);
	fclose(stderr);
    }
    return 0;
}
#endif

char *
strdup(s)
    const char *s;
{
    char *d = malloc(strlen(s) + 1);

    if (d) strcpy(d, s);
    return d;
}

/*
 * This logwtmp() implementation is subject to the following copyright:
 *
 * Copyright (c) 1988 The Regents of the University of California.
 * 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 the University of California, Berkeley.  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.
 */

#define WTMPFILE        "/usr/adm/wtmp"

void
logwtmp(line, name, host)
    const char *line, *name, *host;
{
    int fd;
    struct stat buf;
    struct utmp ut;

    if ((fd = open(WTMPFILE, O_WRONLY|O_APPEND, 0)) < 0)
	return;
    if (!fstat(fd, &buf)) {
	strncpy(ut.ut_line, line, sizeof(ut.ut_line));
	strncpy(ut.ut_name, name, sizeof(ut.ut_name));
	strncpy(ut.ut_host, host, sizeof(ut.ut_host));
	(void)time(&ut.ut_time);
	if (write(fd, (char *)&ut, sizeof(struct utmp)) != sizeof(struct utmp))
	    (void)ftruncate(fd, buf.st_size);
    }
    close(fd);
}

#if 0
/*
 * Routines for locking and unlocking the serial device, moved here
 * from chat.c.
 */

#define LOCK_PREFIX	"/usr/spool/uucp/LCK/LCK.."

static char *lock_file;

/*
 * lock - create a lock file for the named device
 */
int
lock(dev)
    char *dev;
{
    int fd, pid, n;
    char *p;
    size_t l;

    if ((p = strrchr(dev, '/')) != NULL)
	dev = p + 1;
    l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
    lock_file = malloc(l);
    if (lock_file == NULL)
	novm("lock file name");
    slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);

    while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
	if (errno == EEXIST
	    && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
	    /* Read the lock file to find out who has the device locked */
	    n = read(fd, &pid, sizeof(pid));
	    if (n <= 0) {
		error("Can't read pid from lock file %s", lock_file);
		close(fd);
	    } else {
		if (kill(pid, 0) == -1 && errno == ESRCH) {
		    /* pid no longer exists - remove the lock file */
		    if (unlink(lock_file) == 0) {
			close(fd);
			notice("Removed stale lock on %s (pid %d)",
			       dev, pid);
			continue;
		    } else
			warn("Couldn't remove stale lock on %s", dev);
		} else
		    notice("Device %s is locked by pid %d",
			   dev, pid);
	    }
	    close(fd);
	} else
	    error("Can't create lock file %s: %m", lock_file);
	free(lock_file);
	lock_file = NULL;
	return -1;
    }

    pid = getpid();
    write(fd, &pid, sizeof pid);

    close(fd);
    return 0;
}

/*
 * unlock - remove our lockfile
 */
void
unlock()
{
    if (lock_file) {
	unlink(lock_file);
	free(lock_file);
	lock_file = NULL;
    }
}
#endif

#if defined(i386) && defined(HAS_BROKEN_IOCTL)
int
ioctl(fd, cmd, c)
    int fd, cmd;
    caddr_t c;
{
#undef	ioctl
    int ret;

#ifdef DEBUGIOCTL
    int serrno;
    u_char let, code, size;

    size = (cmd >> 16) & IOCPARM_MASK;
    let = (cmd >> 8);
    code = cmd;

    if (let == 't' && (75 <= code && code <= 90))
    info("ioctl(%d, 0x%x ('%c', %d, %d), 0x%x)\n", fd, cmd,
	   let, code, size, c);
#endif

    ret = ioctl(fd, cmd, c);

#ifdef DEBUGIOCTL
    serrno = errno;
    if (ret == -1)
	info("ioctl('%c', %d, %d) errno = %d (%m)\n",
		let, code, size, errno);
    if (let == 't' && (75 <= code && code <= 90) && (cmd & IOC_OUT)) {
	int i, len = ((cmd >> 16) & IOCPARM_MASK);
	for (i = 0; i < len / 4; ++i)
		info("word[%d] @ 0x%06x = 0x%x\n",
		       i, &((int *) c)[i],((int *)c)[i]);
    }
    errno = serrno;
#endif

    if (ret == -1 && errno == EPERM)
	errno = ret = 0;
    return ret;
}
#endif	/* HAS_BROKEN_IOCTL */


#if defined(FIXSIGS) && (defined (hppa) || defined(sparc))

/*
 * These redefinitions of Posix functions are necessary
 * because HPPA systems have an OS bug that causes 
 * sigaction to core dump:
 *
 * AlainF 9-Nov-1994	HACK FOR HP-PA/NEXTSTEP
 *			sigaction(3) seems broken in the HP-PA NeXTSTEP 3.2
 *			Posix lib. This causes pppd to SIGBUS at the expiration
 *			of the first timeout (_sigtramp seems to invoke
 *			the SIGALRM handler at an unreasonably low address).
 *			All calls so sigaction(3) have been changed to calls
 *			to sigvec(2) and sigprocmask(SIG_BLOCK,...) to
 *			sigblock(2).
 *			This is kind of a hack, especially since there are
 *			other routines of the Posix lib still used, but
 *			it worked for me.
 *
 * Dave Hess <[e-mail]> noted that 3.3 Sparc seems to
 * have the same bug.  Thus this fix has been enabled for SPARC also.
 *
 *
 */

int sigemptyset(sigset_t *mask)
{
  *mask = 0;
}

sigaddset(sigset_t *mask, int which_sig)
{
  *mask |= sigmask(which_sig);
}


int sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
{
   struct sigvec sv;
   static int in = 0;

   sv.sv_handler = act->sa_handler;
   sv.sv_mask = act->sa_mask;
   sv.sv_flags = 0;

   if (!in)
     {
       in = 1;
       warn("PPPD: Inside modified HP and SPARC sigaction\n");
     }

   return sigvec(sig, &sv, NULL);
}

#endif


/*
 * Code following is added for 2.3 compatibility
 */

/*
 * get_idle_time - return how long the link has been idle.
 */
int
get_idle_time(u, ip)
    int u;
    struct ppp_idle *ip;
{
  return (ioctl(ttyfd, PPPIOCGIDLE, ip) >= 0); 
}

/*
 * get_ppp_stats - return statistics for the link.
 */
int
get_ppp_stats(u, stats)
    int u;
    struct pppd_stats *stats;
{
    struct ifpppstatsreq req;

    memset (&req, 0, sizeof (req));
    strlcpy(req.ifr_name, interface, sizeof(req.ifr_name));
    if (ioctl(sockfd, SIOCGPPPSTATS, &req) < 0) {
	error("Couldn't get PPP statistics: %m");
	return 0;
    }
    stats->bytes_in = req.stats.p.ppp_ibytes;
    stats->bytes_out = req.stats.p.ppp_obytes;
    return 1;
}


/*
 * get_loop_output - read characters from the loopback, form them
 * into frames, and detect when we want to bring the real link up.
 * Return value is 1 if we need to bring up the link, 0 otherwise.
 */
int
get_loop_output()
{

#if 0
    int rv = 0;
    int n;

    while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
	if (loop_chars(inbuf, n))
	    rv = 1;
    }

    if (n == 0)
	fatal("eof on loopback");
    if (errno != EWOULDBLOCK)
	fatal("read from loopback: %m");

    return rv;
#endif

    return 0;
}

/*
 * sifnpmode - Set the mode for handling packets for a given NP.
 */
int
sifnpmode(u, proto, mode)
    int u;
    int proto;
    enum NPmode mode;
{
    struct npioctl npi;

    npi.protocol = proto;
    npi.mode = mode;
    if (ioctl(ttyfd, PPPIOCSNPMODE, &npi) < 0) {
	error("ioctl(set NP %d mode to %d): %m", proto, mode);
	return 0;
    }
    return 1;
}


/*
 * open_ppp_loopback - open the device we use for getting
 * packets in demand mode, and connect it to a ppp interface.
 * Here we use a pty.
 */
int
open_ppp_loopback()
{

#if 0
    int flags;
    struct termios tios;
    int pppdisc = PPPDISC;

    fatal("open_ppp_loopback called!");

    if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0)
	fatal("No free pty for loopback");
    SYSDEBUG(("using %s for loopback", loop_name));

    if (tcgetattr(loop_slave, &tios) == 0) {
	tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
	tios.c_cflag |= CS8 | CREAD;
	tios.c_iflag = IGNPAR;
	tios.c_oflag = 0;
	tios.c_lflag = 0;
	if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
	    warn("couldn't set attributes on loopback: %m");
    }

    if ((flags = fcntl(loop_master, F_GETFL)) != -1) 
	if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
	    warn("couldn't set loopback to nonblock: %m");

    ttyfd = loop_slave;
    if (ioctl(ttyfd, TIOCSETD, &pppdisc) < 0)
	fatal("ioctl(TIOCSETD): %m");

    /*
     * Find out which interface we were given.
     */
    if (ioctl(ttyfd, PPPIOCGUNIT, &ifunit) < 0)
	fatal("ioctl(PPPIOCGUNIT): %m");

    /*
     * Enable debug in the driver if requested.
     */
    if (kdebugflag) {
	if (ioctl(ttyfd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
	    warn("ioctl (PPPIOCGFLAGS): %m");
	} else {
	    flags |= (kdebugflag & 0xFF) * SC_DEBUG;
	    if (ioctl(ttyfd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
		warn("ioctl(PPPIOCSFLAGS): %m");
	}
    }

    return loop_master;
#endif

}

/*
 * restore_loop - reattach the ppp unit to the loopback.
 */
void
restore_loop()
{
    int x;

    /*
     * Transfer the ppp interface back to the loopback.
     */
    if (ioctl(ttyfd, PPPIOCXFERUNIT, 0) < 0)
	fatal("ioctl(transfer ppp unit): %m");
    x = PPPDISC;
    if (ioctl(loop_slave, TIOCSETD, &x) < 0)
	fatal("ioctl(TIOCSETD): %m");

    /*
     * Check that we got the same unit again.
     */
    if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0)
	fatal("ioctl(PPPIOCGUNIT): %m");
    if (x != ifunit)
	fatal("transfer_ppp failed: wanted unit %d, got %d",
	      ifunit, x);
    ttyfd = loop_slave;
}


/*
 * Use the hostid as part of the random number seed.
 */
int
get_host_seed()
{
    return gethostid();
}


/*
 * sys_check_options - check the options that the user specified
 */
int
sys_check_options()
{
  /*
   * We don't support demand dialing yet.
   */
  if (demand)
    {
      option_error("PPP-2.3 for NeXTSTEP does not yet support demand dialing");
      return 0;
    }
  return 1;
}


/*
 * sys_close - Clean up in a child process before execing.
 */
void
sys_close()
{
    close(sockfd);
    if (loop_slave >= 0) {
	close(loop_slave);
	close(loop_master);
    }
    closelog();
}

#if 0
/*
 * wait_loop_output - wait until there is data available on the
 * loopback, for the length of time specified by *timo (indefinite
 * if timo is NULL).
 */
void wait_loop_output(timo)
    struct timeval *timo;
{
    fd_set ready;
    int n;

    FD_ZERO(&ready);
    FD_SET(loop_master, &ready);
    n = select(loop_master + 1, &ready, NULL, &ready, timo);
    if (n < 0 && errno != EINTR)
	fatal("select: %m");
}

/*
 * wait_time - wait for a given length of time or until a
 * signal is received.
 */
void wait_time(timo)
    struct timeval *timo;
{
    int n;

    n = select(0, NULL, NULL, NULL, timo);
    if (n < 0 && errno != EINTR)
	fatal("select: %m");
}
#endif