da21d85025
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
438 lines
10 KiB
Plaintext
438 lines
10 KiB
Plaintext
# /usr/etc/rc - continued system initialization.
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RANDOM_FILE=/usr/adm/random.dat
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LOCAL_FILE=/usr/etc/rc.local
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ARCH="`sysenv arch`"
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if [ ! "$ARCH" ]
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then # Older kernels do not provide an arch sysenv variable.
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# We assume we are on x86 then, as existing systems with
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# kernel and userland (i.e. this script) unsynchronized
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# will be x86.
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ARCH=i386
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fi
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# Get $SERVICES_DIRS
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. /etc/rc.conf
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# Directories to find services in
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if [ ! "$SERVICES_DIRS" ]
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then SERVICES_DIRS=/service
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fi
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# Booting from cd?
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bootcd="`/bin/sysenv bootcd`"
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case "$#:$1" in
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1:autoboot)
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action=start
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;;
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1:start|1:stop|1:down)
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action=$1
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;;
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*) echo >&2 "Usage: $0 autoboot|start|stop|down"
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exit 1
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esac
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if [ -f "$LOCAL_FILE" ]
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then . "$LOCAL_FILE" $1
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fi
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disabled()
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{
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ifs="$IFS"; IFS=,
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for skip in `sysenv disable`
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do
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if [ "$skip" = "$1" ]
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then
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IFS="$ifs"; unset ifs
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return 0
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fi
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done
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IFS="$ifs"; unset ifs
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return 1
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}
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daemonize()
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{
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# Function to start a daemon, if it exists.
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local IFS=':'
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local name="$1"
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test "$1" = tcpd && name="$2"
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for dir in $PATH
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do
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if [ -f "$dir/$1" ]
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then
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# check if this service is disabled at the boot monitor.
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if disabled $name; then return; fi
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echo -n " $name"
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"$@" &
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return
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fi
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done
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}
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up()
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{
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# Function to dynamically start a system service
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opt=""
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prefix=$(expr "$1 " : '\(-\)')
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if [ "$prefix" = "-" ];
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then
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opt=$1
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shift
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fi
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service=$1
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shift
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# First check if this service is disabled at the boot monitor.
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if disabled $service; then return; fi
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# Service is not disabled. Try to bring it up.
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found=""
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for dir in $SERVICES_DIRS
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do bin=$dir/$service
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if [ -x $bin -a -z "$found" ]
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then service $opt up $bin "$@"
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echo -n " $service"
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found=yes
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fi
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done
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if [ -z "$found" ]
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then echo " ($service not found in $SERVICES_DIRS)"
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fi
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}
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get_eth_labels() {
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# Filter out the non-vlan ethernet entries from inet.conf.
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# Produce as output a list of "drivername_instancenr"-formatted labels.
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sed 's/\008/ /g' /etc/inet.conf | \
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sed -n 's/^ *eth[0-9][0-9]* *\([^ ][^ ]*\) *\([0-9][0-9]*\).*$/\1_\2/p' | \
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grep -v '^vlan_'
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}
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# Detect expansion boards on the BeagleBone and load the proper drivers.
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capemgr() {
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# Probe each possible cape EEPROM slave address for a BeagleBone cape.
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for slave_addr in 54 55 56 57
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do
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# See if there is a readable EEPROM with address ${slave_addr}.
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eepromread -f /dev/i2c-3 -a 0x${slave_addr} > /dev/null 2>&1
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RESULT=$?
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if [ $RESULT -eq 0 ]
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then
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# Found an alive EEPROM. Try reading the cape name.
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CAPE=`eepromread -i -f /dev/i2c-3 -a 0x${slave_addr} | \
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sed -n 's/^PART_NUMBER : \(.*\)$/\1/p' | \
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sed -e 's/\.*$//g'` # Strip trailing periods.
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# Look for a cape specific RC script.
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if [ -x /etc/rc.capes/${CAPE} ]
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then
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# CAT24C256 EEPROM -- all capes have this chip.
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test -e /dev/eepromb3s${slave_addr} || \
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(cd /dev && MAKEDEV eepromb3s${slave_addr})
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up cat24c256 -dev /dev/eepromb3s${slave_addr} \
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-label cat24c256.3.${slave_addr} \
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-args "bus=3 address=0x${slave_addr}"
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# Load the drivers for the cape and do any other configuration.
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. "/etc/rc.capes/${CAPE}"
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else
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echo ""
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echo "** UNSUPPORTED CAPE: ${CAPE}"
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echo ""
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fi
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fi
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done
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}
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DAEMONS=/etc/rc.daemons
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case $action in
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start|autoboot)
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# Select console font.
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test -f /etc/font && loadfont /etc/font </dev/console
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# Cleanup.
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rm -rf /tmp/* /usr/run/* /usr/spool/lpd/* /usr/spool/locks/*
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# Start servers and drivers set at the boot monitor.
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echo -n "Starting services:"
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up -n random -dev /dev/random -period 3HZ
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# load random number generator
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if [ -f $RANDOM_FILE ]
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then
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cat < $RANDOM_FILE >/dev/random
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# overwrite $RANDOM_FILE. We don't want to use this data again
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dd if=/dev/random of=$RANDOM_FILE bs=1024 count=1 2> /dev/null
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fi
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# start network driver instances for all configured ethernet devices
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for label in $(get_eth_labels); do
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driver=$(echo $label | sed 's/\(.*\)_.*/\1/')
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instance=$(echo $label | sed 's/.*_//')
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eval arg=\$${driver}_arg
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if [ ! -z "$arg" ]; then arg=" $arg"; fi
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arg="-args \"instance=$instance$arg\""
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eval up $driver -label $label $arg -period 5HZ
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done
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if [ X`/bin/sysenv lwip` = Xyes ]
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then
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up lwip -script /etc/rs.inet -dev /dev/ip
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else
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up inet -script /etc/rs.inet -dev /dev/ip
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fi
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# pty needs to know the "tty" group ID
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up pty -dev /dev/ptmx -args "gid=`stat -f '%g' /dev/ptmx`"
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up uds -dev /dev/uds
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up -n ipc
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up log -dev /dev/klog
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if [ $ARCH = i386 ]
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then
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up -n printer -dev /dev/lp -period 10HZ
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# start VirtualBox time sync driver if the device is there
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if grep '^[^ ]* [^ ]* 80EE:CAFE[^ ]* ' /proc/pci >/dev/null; then
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up -n vbox -period 10HZ
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fi
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fi
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echo .
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# Network initialization.
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(: </dev/tcp) 2>/dev/null && net=t # Is there a TCP/IP server?
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echo -n "Starting daemons:"
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daemonize update
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# Ugly error message when starting cron from CD.
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# (and cron unnecessary then so..)
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if [ ! -f /CD ]
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then daemonize cron
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else mkdir /tmp/log
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rm -f /var/log || true
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ln -s /tmp/log /var/log || true
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. /etc/rc.cd
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fi
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# syslogd has not been started yet
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rm -f /var/run/syslogd.pid
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daemonize syslogd
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echo .
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# i2c only supported on ARM at the moment
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if [ $ARCH = earm ]
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then
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echo -n "Starting i2c subsystem: "
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for bus in 1 2 3
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do
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test -e /dev/i2c-${bus} || (cd /dev && MAKEDEV i2c-${bus})
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up i2c -dev /dev/i2c-${bus} -label i2c.${bus} \
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-args instance=${bus}
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done
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echo .
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BOARD_NAME=`sysenv board`
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case "${BOARD_NAME}" in
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ARM-ARMV7-TI-BB-WHITE)
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echo "Running on a BeagleBone"
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echo -n "Starting i2c device drivers: "
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# start EEPROM driver for reading board info
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test -e /dev/eepromb1s50 || \
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(cd /dev && MAKEDEV eepromb1s50)
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up cat24c256 -dev /dev/eepromb1s50 \
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-label cat24c256.1.50 \
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-args 'bus=1 address=0x50'
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# Start TPS65217 driver for power management.
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up tps65217 -label tps65217.1.24 \
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-args 'bus=1 address=0x24'
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# check for the presence of a display
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eepromread -f /dev/i2c-2 -n > /dev/null 2>&1
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RESULT=$?
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if [ $RESULT -eq 0 ]
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then
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# start eeprom driver for reading EDID.
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test -e /dev/eepromb2s50 || \
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(cd /dev && MAKEDEV eepromb2s50)
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up cat24c256 -dev /dev/eepromb2s50 \
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-label cat24c256.2.50 \
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-args 'bus=2 address=0x50'
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# start frame buffer
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#up fb -dev /dev/fb0 -args edid.0=cat24c256.2.50
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# fb hasn't been ported to AM335X yet.
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fi
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if [ -e /service/usbd ]
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then
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echo "Starting USBD"
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up usbd
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fi
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# Detect expansion boards and start drivers.
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capemgr
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;;
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ARM-ARMV7-TI-BB-BLACK)
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echo "Running on a BeagleBone Black"
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echo -n "Starting i2c device drivers: "
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# start EEPROM driver for reading board info
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test -e /dev/eepromb1s50 || \
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(cd /dev && MAKEDEV eepromb1s50)
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up cat24c256 -dev /dev/eepromb1s50 \
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-label cat24c256.1.50 \
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-args 'bus=1 address=0x50'
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# Start TPS65217 driver for power management.
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up tps65217 -label tps65217.1.24 \
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-args 'bus=1 address=0x24'
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# Start TDA19988 driver for reading EDID.
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up tda19988 -label tda19988.1.3470 -args \
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'cec_bus=1 cec_address=0x34 hdmi_bus=1 hdmi_address=0x70'
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# start frame buffer
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#up fb -dev /dev/fb0 -args edid.0=tda19988.1.3470
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# fb hasn't been ported to AM335X yet.
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if [ -e /service/usbd ]
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then
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echo "Starting USBD"
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up usbd
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fi
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# Detect expansion boards and start drivers.
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capemgr
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;;
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ARM-ARMV7-TI-BBXM-GENERIC)
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echo "Running on a BeagleBoard-xM"
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echo -n "Starting i2c device drivers: "
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# Start TPS65950 driver for power management.
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up tps65950 -label tps65950.1.48 \
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-args 'bus=1 address=0x48'
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# Set the system time to the time in the TPS65950's RTC
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readclock
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# check for the presence of a display
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eepromread -f /dev/i2c-3 -n > /dev/null 2>&1
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RESULT=$?
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if [ $RESULT -eq 0 ]
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then
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# start eeprom driver for reading edid
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test -e /dev/eepromb3s50 || \
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(cd /dev && MAKEDEV eepromb3s50)
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up cat24c256 -dev /dev/eepromb3s50 \
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-label cat24c256.3.50 \
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-args 'bus=3 address=0x50'
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# start frame buffer
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up fb -dev /dev/fb0 -args edid.0=cat24c256.3.50
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fi
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;;
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esac
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echo .
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fi
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if [ "$net" ]
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then
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if [ -f /etc/rc.net ]
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then
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# Let a customized TCP/IP initialization script figure it out.
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. /etc/rc.net
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else
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# Standard network daemons.
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echo -n "Starting networking:"
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if grep -s 'psip0.*default' /etc/inet.conf >/dev/null
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then ifconfig -h 10.0.0.1
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else
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if [ X`/bin/sysenv lwip` = Xyes ]
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then
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dhcpd --lwip &
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echo -n " dhcpd"
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else
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daemonize dhcpd
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fi
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fi
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daemonize nonamed -L
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if [ -f "$DAEMONS" ]
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then . "$DAEMONS"
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fi
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# The last daemon has been started, so close the list:
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echo .
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fi
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fi
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if [ "$net" ]
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then
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# Get the nodename from the DNS and set it.
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trap '' 2
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intr -t 20 hostaddr -h
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trap 2
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fi
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# Recover files being edited when the system crashed.
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test -f /usr/bin/elvprsv && elvprsv /usr/tmp/elv*
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# Run the daily cleanup on systems that are not on at night.
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test -f /usr/etc/daily && sh /usr/etc/daily boot &
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;;
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stop|down)
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# Save random data, if /usr is mounted rw.
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if grep ' \/usr .*rw.*' /etc/mtab >/dev/null
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then
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if dd if=/dev/random of=$RANDOM_FILE.new bs=1024 count=1 2>/dev/null
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then
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mv $RANDOM_FILE.new $RANDOM_FILE
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else
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echo 'Failed to save random data.'
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fi
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fi
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esac
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d=
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# Let packages run their own scripts
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for d in /usr/local/etc/rc.d /usr/pkg/etc/rc.d
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do
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if [ -d "$d" -a -z "$bootcd" ]
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then ( if cd $d
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then
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echo -n "Local packages ($action): "
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for f in *
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do
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if [ -x "$f" ]
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then echo -n "$f "
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sh "$f" "$action"
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fi
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done
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echo " done."
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fi
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)
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fi
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done
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