#!/bin/sh

#

# Kdump common variables and functions

#

DEFAULT_PATH="/var/crash/"

FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump"

FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send"

FADUMP_ENABLED_SYS_NODE="/sys/kernel/fadump_enabled"

is_fadump_capable()

{

    # Check if firmware-assisted dump is enabled

    # if no, fallback to kdump check

    if [ -f $FADUMP_ENABLED_SYS_NODE ]; then

        rc=`cat $FADUMP_ENABLED_SYS_NODE`

        [ $rc -eq 1 ] && return 0

    fi

    return 1

}

perror_exit() {

    echo $@ >&2

    exit 1

}

perror() {

    echo $@ >&2

}

is_ssh_dump_target()

{

    grep -q "^ssh[[:blank:]].*@" /etc/kdump.conf

}

is_nfs_dump_target()

{

    grep -q "^nfs" /etc/kdump.conf || \

        [[ $(get_dracut_args_fstype "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)") = nfs* ]]

}

is_raw_dump_target()

{

    grep -q "^raw" /etc/kdump.conf

}

is_fs_type_nfs()

{

    local _fstype=$1

    [ $_fstype = "nfs" ] || [ $_fstype = "nfs4" ] && return 0

    return 1

}

is_fs_dump_target()

{

    egrep -q "^ext[234]|^xfs|^btrfs|^minix" /etc/kdump.conf

}

strip_comments()

{

    echo $@ | sed -e 's/\(.*\)#.*/\1/'

}

# Check if fence kdump is configured in Pacemaker cluster

is_pcs_fence_kdump()

{

    # no pcs or fence_kdump_send executables installed?

    type -P pcs > /dev/null || return 1

    [ -x $FENCE_KDUMP_SEND ] || return 1

    # fence kdump not configured?

    (pcs cluster cib | grep 'type="fence_kdump"') &> /dev/null || return 1

}

# Check if fence_kdump is configured using kdump options

is_generic_fence_kdump()

{

    [ -x $FENCE_KDUMP_SEND ] || return 1

    grep -q "^fence_kdump_nodes" /etc/kdump.conf

}

to_dev_name() {

    local dev="${1//\"/}"

    case "$dev" in

    UUID=*)

        dev=`blkid -U "${dev#UUID=}"`

        ;;

    LABEL=*)

        dev=`blkid -L "${dev#LABEL=}"`

        ;;

    esac

    echo $dev

}

is_user_configured_dump_target()

{

    return $(is_mount_in_dracut_args || is_ssh_dump_target || is_nfs_dump_target || \

             is_raw_dump_target || is_fs_dump_target)

}

get_user_configured_dump_disk()

{

    local _target

    _target=$(egrep "^ext[234]|^xfs|^btrfs|^minix|^raw" /etc/kdump.conf 2>/dev/null |awk '{print $2}')

    [ -n "$_target" ] && echo $_target && return

    _target=$(get_dracut_args_target "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)")

    [ -b "$_target" ] && echo $_target

}

get_root_fs_device()

{

    local _target

    _target=$(findmnt -k -f -n -o SOURCE /)

    [ -n "$_target" ] && echo $_target

    return

}

get_save_path()

{

	local _save_path=$(grep "^path" /etc/kdump.conf|awk '{print $2}')

	if [ -z "$_save_path" ]; then

		_save_path=$DEFAULT_PATH

	fi

	echo $_save_path

}

get_block_dump_target()

{

    local _target _path

    if is_ssh_dump_target || is_nfs_dump_target; then

        return

    fi

    _target=$(get_user_configured_dump_disk)

    [ -n "$_target" ] && echo $(to_dev_name $_target) && return

    # Get block device name from local save path

    _path=$(get_save_path)

    _target=$(get_target_from_path $_path)

    [ -b "$_target" ] && echo $(to_dev_name $_target)

}

is_dump_to_rootfs()

{

    grep "^default[[:space:]]dump_to_rootfs" /etc/kdump.conf >/dev/null

}

get_default_action_target()

{

    local _target

    if is_dump_to_rootfs; then

        # Get rootfs device name

        _target=$(get_root_fs_device)

        [ -b "$_target" ] && echo $(to_dev_name $_target) && return

        # Then, must be nfs root

        echo "nfs"

    fi

}

# Get kdump targets(including root in case of dump_to_rootfs).

get_kdump_targets()

{

    local _target _root

    local kdump_targets

    _target=$(get_block_dump_target)

    if [ -n "$_target" ]; then

        kdump_targets=$_target

    elif is_ssh_dump_target; then

        kdump_targets="ssh"

    else

        kdump_targets="nfs"

    fi

    # Add the root device if dump_to_rootfs is specified.

    _root=$(get_default_action_target)

    if [ -n "$_root" -a "$kdump_targets" != "$_root" ]; then

        kdump_targets="$kdump_targets $_root"

    fi

    echo "$kdump_targets"

}

# findmnt uses the option "-v, --nofsroot" to exclusive the [/dir]

# in the SOURCE column for bind-mounts, then if $_mntpoint equals to

# $_mntpoint_nofsroot, the mountpoint is not bind mounted directory.

is_bind_mount()

{

    local _mntpoint=$(findmnt $1 | tail -n 1 | awk '{print $2}')

    local _mntpoint_nofsroot=$(findmnt -v $1 | tail -n 1 | awk '{print $2}')

    if [[ $_mntpoint = $_mntpoint_nofsroot ]]; then

        return 1

    else

        return 0

    fi

}

# Below is just an example for mount info

# /dev/mapper/atomicos-root[/ostree/deploy/rhel-atomic-host/var], if the

# directory is bind mounted. The former part represents the device path, rest

# part is the bind mounted directory which quotes by bracket "[]".

get_bind_mount_directory()

{

    local _mntpoint=$(findmnt $1 | tail -n 1 | awk '{print $2}')

    local _mntpoint_nofsroot=$(findmnt -v $1 | tail -n 1 | awk '{print $2}')

    _mntpoint=${_mntpoint#*$_mntpoint_nofsroot}

    _mntpoint=${_mntpoint#[}

    _mntpoint=${_mntpoint%]}

    echo $_mntpoint

}

get_mntpoint_from_path() 

{

    echo $(df $1 | tail -1 |  awk '{print $NF}')

}

get_target_from_path()

{

    local _target

    _target=$(df $1 2>/dev/null | tail -1 |  awk '{print $1}')

    [[ "$_target" == "/dev/root" ]] && [[ ! -e /dev/root ]] && _target=$(get_root_fs_device)

    echo $_target

}

get_fs_type_from_target() 

{

    echo $(findmnt -k -f -n -r -o FSTYPE $1)

}

# input: device path

# output: the general mount point

# find the general mount point, not the bind mounted point in atomic

# As general system, Use the previous code

#

# ERROR and EXIT:

# the device can be umounted the general mount point, if one of the mount point is bind mounted

# For example:

# mount /dev/sda /mnt/

# mount -o bind /mnt/var /var

# umount /mnt

get_mntpoint_from_target()

{

    if is_atomic; then

        for _mnt in $(findmnt -k -n -r -o TARGET $1)

        do

            if ! is_bind_mount $_mnt; then

                echo $_mnt

                return

            fi

        done

        echo "Mount $1 firstly, without the bind mode" >&2

        exit 1

    else

        echo $(findmnt -k -f -n -r -o TARGET $1)

    fi

}

# get_option_value <option_name>

# retrieves value of option defined in kdump.conf

get_option_value() {

    echo $(strip_comments `grep "^$1[[:space:]]\+" /etc/kdump.conf | tail -1 | cut -d\  -f2-`)

}

#This function compose a absolute path with the mount

#point and the relative $SAVE_PATH.

#target is passed in as argument, could be UUID, LABEL,

#block device or even nfs server export of the form of

#"my.server.com:/tmp/export"?

#And possibly this could be used for both default case

#as well as when dump taret is specified. When dump

#target is not specified, then $target would be null.

make_absolute_save_path()

{

    local _target=$1

    local _mnt

    [ -n $_target ] && _mnt=$(get_mntpoint_from_target $1)

    _mnt="${_mnt}/$SAVE_PATH"

    # strip the duplicated "/"

    echo "$_mnt" | tr -s /

}

check_save_path_fs()

{

    local _path=$1

    if [ ! -d $_path ]; then

        perror_exit "Dump path $_path does not exist."

    fi

}

is_atomic()

{

    grep -q "ostree" /proc/cmdline

}

# fixme, try the best to decide whether the ipv6 addr is allocated by slaac or dhcp6

is_ipv6_auto()

{

    local _netdev=$1

    local _auto=$(cat /proc/sys/net/ipv6/conf/$_netdev/autoconf)

    if [ $_auto -eq 1 ]; then

        return 0

    else

        return 1

    fi

}

is_ipv6_address()

{

    echo $1 | grep -q ":"

}

# get ip address or hostname from nfs/ssh config value

get_remote_host()

{

    local _config_val=$1

    # ipv6 address in kdump.conf is around with "[]",

    # factor out the ipv6 address

    _config_val=${_config_val#*@}

    _config_val=${_config_val%:/*}

    _config_val=${_config_val#[}

    _config_val=${_config_val%]}

    echo $_config_val

}

is_hostname()

{

    local _hostname=`echo $1 | grep ":"`

    if [ -n "$_hostname" ]; then

        return 1

    fi

    echo $1 | grep -q "[a-zA-Z]"

}

# Copied from "/etc/sysconfig/network-scripts/network-functions"

get_hwaddr()

{

    if [ -f "/sys/class/net/${1}/address" ]; then

        awk '{ print toupper($0) }' < /sys/class/net/${1}/address

    elif [ -d "/sys/class/net/${1}" ]; then

       LC_ALL= LANG= ip -o link show ${1} 2>/dev/null | \

            awk '{ print toupper(gensub(/.*link\/[^ ]* ([[:alnum:]:]*).*/,

                                        "\\1", 1)); }'

    fi

}

get_ifcfg_by_device()

{

    grep -E -i -l "^[[:space:]]*DEVICE=\"*${1}\"*[[:space:]]*$" \

         /etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1

}

get_ifcfg_by_hwaddr()

{

    grep -E -i -l "^[[:space:]]*HWADDR=\"*${1}\"*[[:space:]]*$" \

         /etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1

}

get_ifcfg_by_uuid()

{

    grep -E -i -l "^[[:space:]]*UUID=\"*${1}\"*[[:space:]]*$" \

         /etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1

}

get_ifcfg_by_name()

{

    grep -E -i -l "^[[:space:]]*NAME=\"*${1}\"*[[:space:]]*$" \

         /etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1

}

is_nm_running()

{

    [ "$(LANG=C nmcli -t --fields running general status 2>/dev/null)" = "running" ]

}

is_nm_handling()

{

    LANG=C nmcli -t --fields device,state  dev status 2>/dev/null \

          | grep -q "^\(${1}:connected\)\|\(${1}:connecting.*\)$"

}

# $1: netdev name

get_ifcfg_nmcli()

{

    local nm_uuid nm_name

    local ifcfg_file

    # Get the active nmcli config name of $1

    if is_nm_running && is_nm_handling "${1}" ; then

        # The configuration "uuid" and "name" generated by nm is wrote to

        # the ifcfg file as "UUID=<nm_uuid>" and "NAME=<nm_name>".

        nm_uuid=$(LANG=C nmcli -t --fields uuid,device c show --active 2>/dev/null \

                  | grep "${1}" | head -1 | cut -d':' -f1)

        nm_name=$(LANG=C nmcli -t --fields name,device c show --active 2>/dev/null \

                  | grep "${1}" | head -1 | cut -d':' -f1)

        ifcfg_file=$(get_ifcfg_by_uuid "${nm_uuid}")

        [ -z "${ifcfg_file}" ] && ifcfg_file=$(get_ifcfg_by_name "${nm_name}")

    fi

    echo -n "${ifcfg_file}"

}

# $1: netdev name

get_ifcfg_legacy()

{

    local ifcfg_file

    ifcfg_file="/etc/sysconfig/network-scripts/ifcfg-${1}"

    [ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return

    ifcfg_file=$(get_ifcfg_by_name "${1}")

    [ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return

    local hwaddr=$(get_hwaddr "${1}")

    if [ -n "$hwaddr" ]; then

        ifcfg_file=$(get_ifcfg_by_hwaddr "${hwaddr}")

        [ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return

    fi

    ifcfg_file=$(get_ifcfg_by_device "${1}")

    echo -n "${ifcfg_file}"

}

# $1: netdev name

# Return the ifcfg file whole name(including the path) of $1 if any.

get_ifcfg_filename() {

    local ifcfg_file

    ifcfg_file=$(get_ifcfg_nmcli "${1}")

    if [ -z "${ifcfg_file}" ]; then

        ifcfg_file=$(get_ifcfg_legacy "${1}")

    fi

    echo -n "${ifcfg_file}"

}

# returns 0 when omission of watchdog module is desired in dracut_args

# returns 1 otherwise

is_wdt_mod_omitted() {

	local dracut_args

	local ret=1

	dracut_args=$(grep  "^dracut_args" /etc/kdump.conf)

	[[ -z $dracut_args ]] && return $ret

	eval set -- $dracut_args

	while :; do

		[[ -z $1 ]] && break

		case $1 in

			-o|--omit)

				echo $2 | grep -qw "watchdog"

				[[ $? == 0 ]] && ret=0

				break

		esac

		shift

	done

	return $ret

}

# If "dracut_args" contains "--mount" information, use it

# directly without any check(users are expected to ensure

# its correctness).

is_mount_in_dracut_args()

{

    grep -q "^dracut_args .*\-\-mount" /etc/kdump.conf

}

# If $1 contains dracut_args "--mount", return <filesystem type>

get_dracut_args_fstype()

{

    echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f3

}

# If $1 contains dracut_args "--mount", return <device>

get_dracut_args_target()

{

    echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f1

}

check_crash_mem_reserved()

{

    local mem_reserved

    mem_reserved=$(cat /sys/kernel/kexec_crash_size)

    if [ $mem_reserved -eq 0 ]; then

        echo "No memory reserved for crash kernel"

        return 1

    fi

    return 0

}

check_kdump_feasibility()

{

    if [ ! -e /sys/kernel/kexec_crash_loaded ]; then

        echo "Kdump is not supported on this kernel"

        return 1

    fi

    check_crash_mem_reserved

    return $?

}

check_current_kdump_status()

{

    if [ ! -f /sys/kernel/kexec_crash_loaded ];then

        echo "Perhaps CONFIG_CRASH_DUMP is not enabled in kernel"

        return 1

    fi

    rc=`cat /sys/kernel/kexec_crash_loaded`

    if [ $rc == 1 ]; then

        return 0

    else

        return 1

    fi

}

# remove_cmdline_param <kernel cmdline> <param1> [<param2>] ... [<paramN>]

# Remove a list of kernel parameters from a given kernel cmdline and print the result.

# For each "arg" in the removing params list, "arg" and "arg=xxx" will be removed if exists.

remove_cmdline_param()

{

    local cmdline=$1

    shift

    for arg in $@; do

        cmdline=`echo $cmdline | \

                 sed -e "s/\b$arg=[^ ]*//g" \

                 -e "s/^$arg\b//g" \

                 -e "s/[[:space:]]$arg\b//g" \

                 -e "s/\s\+/ /g"`

    done

    echo $cmdline

}

#

# This function returns the "apicid" of the boot

# cpu (cpu 0) if present.

#

get_bootcpu_apicid()

{

    awk '                                                       \

        BEGIN { CPU = "-1"; }                                   \

        $1=="processor" && $2==":"      { CPU = $NF; }          \

        CPU=="0" && /^apicid/           { print $NF; }          \

        '                                                       \

        /proc/cpuinfo

}

#

# append_cmdline <kernel cmdline> <parameter name> <parameter value>

# This function appends argument "$2=$3" to string ($1) if not already present.

#

append_cmdline()

{

    local cmdline=$1

    local newstr=${cmdline/$2/""}

    # unchanged str implies argument wasn't there

    if [ "$cmdline" == "$newstr" ]; then

        cmdline="${cmdline} ${2}=${3}"

    fi

    echo $cmdline

}

# This function check iomem and determines if we have more than

# 4GB of ram available. Returns 1 if we do, 0 if we dont

need_64bit_headers()

{

    return `tail -n 1 /proc/iomem | awk '{ split ($1, r, "-"); \

    print (strtonum("0x" r[2]) > strtonum("0xffffffff")); }'`

}

# Check if secure boot is being enforced.

#

# Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and

# SetupMode-$(the UUID), they are both 5 bytes binary data. The first four

# bytes are the attributes associated with the variable and can safely be

# ignored, the last bytes are one-byte true-or-false variables. If SecureBoot

# is 1 and SetupMode is 0, then secure boot is being enforced.

#

# Assume efivars is mounted at /sys/firmware/efi/efivars.

is_secure_boot_enforced()

{

    local secure_boot_file setup_mode_file

    local secure_boot_byte setup_mode_byte

    secure_boot_file=$(find /sys/firmware/efi/efivars -name SecureBoot-* 2>/dev/null)

    setup_mode_file=$(find /sys/firmware/efi/efivars -name SetupMode-* 2>/dev/null)

    if [ -f "$secure_boot_file" ] && [ -f "$setup_mode_file" ]; then

        secure_boot_byte=$(hexdump -v -e '/1 "%d\ "' $secure_boot_file|cut -d' ' -f 5)

        setup_mode_byte=$(hexdump -v -e '/1 "%d\ "' $setup_mode_file|cut -d' ' -f 5)

        if [ "$secure_boot_byte" = "1" ] && [ "$setup_mode_byte" = "0" ]; then

            return 0

        fi

    fi

    return 1

}

#

# prepare_kexec_args <kexec args>

# This function prepares kexec argument.

#

prepare_kexec_args()

{

    local kexec_args=$1

    local found_elf_args

    ARCH=`uname -m`

    if [ "$ARCH" == "i686" -o "$ARCH" == "i386" ]

    then

        need_64bit_headers

        if [ $? == 1 ]

        then

            found_elf_args=`echo $kexec_args | grep elf32-core-headers`

            if [ -n "$found_elf_args" ]

            then

                echo -n "Warning: elf32-core-headers overrides correct elf64 setting"

                echo

            else

                kexec_args="$kexec_args --elf64-core-headers"

            fi

        else

            found_elf_args=`echo $kexec_args | grep elf64-core-headers`

            if [ -z "$found_elf_args" ]

            then

                kexec_args="$kexec_args --elf32-core-headers"

            fi

        fi

    fi

    echo $kexec_args

}

check_boot_dir()

{

    local kdump_bootdir=$1

    #If user specify a boot dir for kdump kernel, let's use it. Otherwise

    #check whether it's a atomic host. If yes parse the subdirectory under

    #/boot; If not just find it under /boot.

    if [ -n "$kdump_bootdir" ]; then

        echo "$kdump_bootdir"

        return

    fi

    if ! is_atomic || [ "$(uname -m)" = "s390x" ]; then

        kdump_bootdir="/boot"

    else

        eval $(cat /proc/cmdline| grep "BOOT_IMAGE" | cut -d' ' -f1)

        kdump_bootdir="/boot"$(dirname $BOOT_IMAGE)

    fi

    echo $kdump_bootdir

}

#

# prepare_cmdline <commandline> <commandline remove> <commandline append>

# This function performs a series of edits on the command line.

# Store the final result in global $KDUMP_COMMANDLINE.

prepare_cmdline()

{

    local cmdline id

    if [ -z "$1" ]; then

        cmdline=$(cat /proc/cmdline)

    else

        cmdline="$1"

    fi

    # These params should always be removed

    cmdline=$(remove_cmdline_param "$cmdline" crashkernel panic_on_warn)

    # These params can be removed configurably

    cmdline=$(remove_cmdline_param "$cmdline" "$2")

    # Always remove "root=X", as we now explicitly generate all kinds

    # of dump target mount information including root fs.

    #

    # We do this before KDUMP_COMMANDLINE_APPEND, if one really cares

    # about it(e.g. for debug purpose), then can pass "root=X" using

    # KDUMP_COMMANDLINE_APPEND.

    cmdline=$(remove_cmdline_param "$cmdline" root)

    # With the help of "--hostonly-cmdline", we can avoid some interitage.

    cmdline=$(remove_cmdline_param "$cmdline" rd.lvm.lv rd.luks.uuid rd.dm.uuid rd.md.uuid fcoe)

    # Remove netroot, rd.iscsi.initiator and iscsi_initiator since

    # we get duplicate entries for the same in case iscsi code adds

    # it as well.

    cmdline=$(remove_cmdline_param "$cmdline" netroot rd.iscsi.initiator iscsi_initiator)

    cmdline="${cmdline} $3"

    id=$(get_bootcpu_apicid)

    if [ ! -z ${id} ] ; then

        cmdline=$(append_cmdline "${cmdline}" disable_cpu_apicid ${id})

    fi