minix/etc/usr/rc
David van Moolenbroek da21d85025 Add PTYFS, Unix98 pseudo terminal support
This patch adds support for Unix98 pseudo terminals, that is,
posix_openpt(3), grantpt(3), unlockpt(3), /dev/ptmx, and /dev/pts/.
The latter is implemented with a new pseudo file system, PTYFS.

In effect, this patch adds secure support for unprivileged pseudo
terminal allocation, allowing programs such as tmux(1) to be used by
non-root users as well.  Test77 has been extended with new tests, and
no longer needs to run as root.

The new functionality is optional.  To revert to the old behavior,
remove the "ptyfs" entry from /etc/fstab.

Technical nodes:

o The reason for not implementing the NetBSD /dev/ptm approach is that
  implementing the corresponding ioctl (TIOCPTMGET) would require
  adding a number of extremely hairy exceptions to VFS, including the
  PTY driver having to create new file descriptors for its own device
  nodes.

o PTYFS is required for Unix98 PTYs in order to avoid that the PTY
  driver has to be aware of old-style PTY naming schemes and even has
  to call chmod(2) on a disk-backed file system.  PTY cannot be its
  own PTYFS since a character driver may currently not also be a file
  system.  However, PTYFS may be subsumed into a DEVFS in the future.

o The Unix98 PTY behavior differs somewhat from NetBSD's, in that
  slave nodes are created on ptyfs only upon the first call to
  grantpt(3).  This approach obviates the need to revoke access as
  part of the grantpt(3) call.

o Shutting down PTY may leave slave nodes on PTYFS, but once PTY is
  restarted, these leftover slave nodes will be removed before they
  create a security risk.  Unmounting PTYFS will make existing PTY
  slaves permanently unavailable, and absence of PTYFS will block
  allocation of new Unix98 PTYs until PTYFS is (re)mounted.

Change-Id: I822b43ba32707c8815fd0f7d5bb7a438f51421c1
2015-06-23 17:43:46 +00:00

437 lines
10 KiB
Text

# /usr/etc/rc - continued system initialization.
RANDOM_FILE=/usr/adm/random.dat
LOCAL_FILE=/usr/etc/rc.local
ARCH="`sysenv arch`"
if [ ! "$ARCH" ]
then # Older kernels do not provide an arch sysenv variable.
# We assume we are on x86 then, as existing systems with
# kernel and userland (i.e. this script) unsynchronized
# will be x86.
ARCH=i386
fi
# Get $SERVICES_DIRS
. /etc/rc.conf
# Directories to find services in
if [ ! "$SERVICES_DIRS" ]
then SERVICES_DIRS=/service
fi
# Booting from cd?
bootcd="`/bin/sysenv bootcd`"
case "$#:$1" in
1:autoboot)
action=start
;;
1:start|1:stop|1:down)
action=$1
;;
*) echo >&2 "Usage: $0 autoboot|start|stop|down"
exit 1
esac
if [ -f "$LOCAL_FILE" ]
then . "$LOCAL_FILE" $1
fi
disabled()
{
ifs="$IFS"; IFS=,
for skip in `sysenv disable`
do
if [ "$skip" = "$1" ]
then
IFS="$ifs"; unset ifs
return 0
fi
done
IFS="$ifs"; unset ifs
return 1
}
daemonize()
{
# Function to start a daemon, if it exists.
local IFS=':'
local name="$1"
test "$1" = tcpd && name="$2"
for dir in $PATH
do
if [ -f "$dir/$1" ]
then
# check if this service is disabled at the boot monitor.
if disabled $name; then return; fi
echo -n " $name"
"$@" &
return
fi
done
}
up()
{
# Function to dynamically start a system service
opt=""
prefix=$(expr "$1 " : '\(-\)')
if [ "$prefix" = "-" ];
then
opt=$1
shift
fi
service=$1
shift
# First check if this service is disabled at the boot monitor.
if disabled $service; then return; fi
# Service is not disabled. Try to bring it up.
found=""
for dir in $SERVICES_DIRS
do bin=$dir/$service
if [ -x $bin -a -z "$found" ]
then service $opt up $bin "$@"
echo -n " $service"
found=yes
fi
done
if [ -z "$found" ]
then echo " ($service not found in $SERVICES_DIRS)"
fi
}
get_eth_labels() {
# Filter out the non-vlan ethernet entries from inet.conf.
# Produce as output a list of "drivername_instancenr"-formatted labels.
sed 's/\008/ /g' /etc/inet.conf | \
sed -n 's/^ *eth[0-9][0-9]* *\([^ ][^ ]*\) *\([0-9][0-9]*\).*$/\1_\2/p' | \
grep -v '^vlan_'
}
# Detect expansion boards on the BeagleBone and load the proper drivers.
capemgr() {
# Probe each possible cape EEPROM slave address for a BeagleBone cape.
for slave_addr in 54 55 56 57
do
# See if there is a readable EEPROM with address ${slave_addr}.
eepromread -f /dev/i2c-3 -a 0x${slave_addr} > /dev/null 2>&1
RESULT=$?
if [ $RESULT -eq 0 ]
then
# Found an alive EEPROM. Try reading the cape name.
CAPE=`eepromread -i -f /dev/i2c-3 -a 0x${slave_addr} | \
sed -n 's/^PART_NUMBER : \(.*\)$/\1/p' | \
sed -e 's/\.*$//g'` # Strip trailing periods.
# Look for a cape specific RC script.
if [ -x /etc/rc.capes/${CAPE} ]
then
# CAT24C256 EEPROM -- all capes have this chip.
test -e /dev/eepromb3s${slave_addr} || \
(cd /dev && MAKEDEV eepromb3s${slave_addr})
up cat24c256 -dev /dev/eepromb3s${slave_addr} \
-label cat24c256.3.${slave_addr} \
-args "bus=3 address=0x${slave_addr}"
# Load the drivers for the cape and do any other configuration.
. "/etc/rc.capes/${CAPE}"
else
echo ""
echo "** UNSUPPORTED CAPE: ${CAPE}"
echo ""
fi
fi
done
}
DAEMONS=/etc/rc.daemons
case $action in
start|autoboot)
# Select console font.
test -f /etc/font && loadfont /etc/font </dev/console
# Cleanup.
rm -rf /tmp/* /usr/run/* /usr/spool/lpd/* /usr/spool/locks/*
# Start servers and drivers set at the boot monitor.
echo -n "Starting services:"
up -n random -dev /dev/random -period 3HZ
# load random number generator
if [ -f $RANDOM_FILE ]
then
cat < $RANDOM_FILE >/dev/random
# overwrite $RANDOM_FILE. We don't want to use this data again
dd if=/dev/random of=$RANDOM_FILE bs=1024 count=1 2> /dev/null
fi
# start network driver instances for all configured ethernet devices
for label in $(get_eth_labels); do
driver=$(echo $label | sed 's/\(.*\)_.*/\1/')
instance=$(echo $label | sed 's/.*_//')
eval arg=\$${driver}_arg
if [ ! -z "$arg" ]; then arg=" $arg"; fi
arg="-args \"instance=$instance$arg\""
eval up $driver -label $label $arg -period 5HZ
done
if [ X`/bin/sysenv lwip` = Xyes ]
then
up lwip -script /etc/rs.inet -dev /dev/ip
else
up inet -script /etc/rs.inet -dev /dev/ip
fi
# pty needs to know the "tty" group ID
up pty -dev /dev/ptmx -args "gid=`stat -f '%g' /dev/ptmx`"
up uds -dev /dev/uds
up -n ipc
up log -dev /dev/klog
if [ $ARCH = i386 ]
then
up -n printer -dev /dev/lp -period 10HZ
# start VirtualBox time sync driver if the device is there
if grep '^[^ ]* [^ ]* 80EE:CAFE[^ ]* ' /proc/pci >/dev/null; then
up -n vbox -period 10HZ
fi
fi
echo .
# Network initialization.
(: </dev/tcp) 2>/dev/null && net=t # Is there a TCP/IP server?
echo -n "Starting daemons:"
daemonize update
# Ugly error message when starting cron from CD.
# (and cron unnecessary then so..)
if [ ! -f /CD ]
then daemonize cron
else mkdir /tmp/log
rm -f /var/log || true
ln -s /tmp/log /var/log || true
. /etc/rc.cd
fi
# syslogd has not been started yet
rm -f /var/run/syslogd.pid
daemonize syslogd
echo .
# i2c only supported on ARM at the moment
if [ $ARCH = earm ]
then
echo -n "Starting i2c subsystem: "
for bus in 1 2 3
do
test -e /dev/i2c-${bus} || (cd /dev && MAKEDEV i2c-${bus})
up i2c -dev /dev/i2c-${bus} -label i2c.${bus} \
-args instance=${bus}
done
echo .
BOARD_NAME=`sysenv board`
case "${BOARD_NAME}" in
ARM-ARMV7-TI-BB-WHITE)
echo "Running on a BeagleBone"
echo -n "Starting i2c device drivers: "
# start EEPROM driver for reading board info
test -e /dev/eepromb1s50 || \
(cd /dev && MAKEDEV eepromb1s50)
up cat24c256 -dev /dev/eepromb1s50 \
-label cat24c256.1.50 \
-args 'bus=1 address=0x50'
# Start TPS65217 driver for power management.
up tps65217 -label tps65217.1.24 \
-args 'bus=1 address=0x24'
# check for the presence of a display
eepromread -f /dev/i2c-2 -n > /dev/null 2>&1
RESULT=$?
if [ $RESULT -eq 0 ]
then
# start eeprom driver for reading EDID.
test -e /dev/eepromb2s50 || \
(cd /dev && MAKEDEV eepromb2s50)
up cat24c256 -dev /dev/eepromb2s50 \
-label cat24c256.2.50 \
-args 'bus=2 address=0x50'
# start frame buffer
#up fb -dev /dev/fb0 -args edid.0=cat24c256.2.50
# fb hasn't been ported to AM335X yet.
fi
if [ -e /service/usbd ]
then
echo "Starting USBD"
up usbd
fi
# Detect expansion boards and start drivers.
capemgr
;;
ARM-ARMV7-TI-BB-BLACK)
echo "Running on a BeagleBone Black"
echo -n "Starting i2c device drivers: "
# start EEPROM driver for reading board info
test -e /dev/eepromb1s50 || \
(cd /dev && MAKEDEV eepromb1s50)
up cat24c256 -dev /dev/eepromb1s50 \
-label cat24c256.1.50 \
-args 'bus=1 address=0x50'
# Start TPS65217 driver for power management.
up tps65217 -label tps65217.1.24 \
-args 'bus=1 address=0x24'
# Start TDA19988 driver for reading EDID.
up tda19988 -label tda19988.1.3470 -args \
'cec_bus=1 cec_address=0x34 hdmi_bus=1 hdmi_address=0x70'
# start frame buffer
#up fb -dev /dev/fb0 -args edid.0=tda19988.1.3470
# fb hasn't been ported to AM335X yet.
if [ -e /service/usbd ]
then
echo "Starting USBD"
up usbd
fi
# Detect expansion boards and start drivers.
capemgr
;;
ARM-ARMV7-TI-BBXM-GENERIC)
echo "Running on a BeagleBoard-xM"
echo -n "Starting i2c device drivers: "
# Start TPS65950 driver for power management.
up tps65950 -label tps65950.1.48 \
-args 'bus=1 address=0x48'
# Set the system time to the time in the TPS65950's RTC
readclock
# check for the presence of a display
eepromread -f /dev/i2c-3 -n > /dev/null 2>&1
RESULT=$?
if [ $RESULT -eq 0 ]
then
# start eeprom driver for reading edid
test -e /dev/eepromb3s50 || \
(cd /dev && MAKEDEV eepromb3s50)
up cat24c256 -dev /dev/eepromb3s50 \
-label cat24c256.3.50 \
-args 'bus=3 address=0x50'
# start frame buffer
up fb -dev /dev/fb0 -args edid.0=cat24c256.3.50
fi
;;
esac
echo .
fi
if [ "$net" ]
then
if [ -f /etc/rc.net ]
then
# Let a customized TCP/IP initialization script figure it out.
. /etc/rc.net
else
# Standard network daemons.
echo -n "Starting networking:"
if grep -s 'psip0.*default' /etc/inet.conf >/dev/null
then ifconfig -h 10.0.0.1
else
if [ X`/bin/sysenv lwip` = Xyes ]
then
dhcpd --lwip &
echo -n " dhcpd"
else
daemonize dhcpd
fi
fi
daemonize nonamed -L
if [ -f "$DAEMONS" ]
then . "$DAEMONS"
fi
# The last daemon has been started, so close the list:
echo .
fi
fi
if [ "$net" ]
then
# Get the nodename from the DNS and set it.
trap '' 2
intr -t 20 hostaddr -h
trap 2
fi
# Recover files being edited when the system crashed.
test -f /usr/bin/elvprsv && elvprsv /usr/tmp/elv*
# Run the daily cleanup on systems that are not on at night.
test -f /usr/etc/daily && sh /usr/etc/daily boot &
;;
stop|down)
# Save random data, if /usr is mounted rw.
if grep ' \/usr .*rw.*' /etc/mtab >/dev/null
then
if dd if=/dev/random of=$RANDOM_FILE.new bs=1024 count=1 2>/dev/null
then
mv $RANDOM_FILE.new $RANDOM_FILE
else
echo 'Failed to save random data.'
fi
fi
esac
d=
# Let packages run their own scripts
for d in /usr/local/etc/rc.d /usr/pkg/etc/rc.d
do
if [ -d "$d" -a -z "$bootcd" ]
then ( if cd $d
then
echo -n "Local packages ($action): "
for f in *
do
if [ -x "$f" ]
then echo -n "$f "
sh "$f" "$action"
fi
done
echo " done."
fi
)
fi
done