sysconfig/network-scripts/functions.network

   1 #!/bin/sh - keep it for file(1) to get bourne shell script result
   2 #
   3 # $Id$
   4 #
   5 # This is not a shell script; it provides functions to network scripts
   6 # that source it.
   7
   8 source_config ()
   9 {
  10         local foundconfig=0
  11
  12         DEVNAME=${CONFIG##*/}
  13         DEVNAME=${DEVNAME##ifcfg-}
  14         DEVNAME=${DEVNAME##tnlcfg-}
  15
  16         if [[ "$CONFIG" = /* ]]; then
  17                 if [ -f "$CONFIG" ]; then
  18                         . "$CONFIG"
  19                         foundconfig=1
  20                 fi
  21         elif [ -f "/etc/sysconfig/interfaces/$CONFIG" ]; then
  22                 . "/etc/sysconfig/interfaces/$CONFIG"
  23                 foundconfig=1
  24         fi
  25
  26         # This is sanity check so that if you've copied ifcfg-eth0 to ifcfg-eth1
  27         # and forgot to alter DEVICE= line you won't accidentally bring down eth0
  28         # while executing ifdown eth1. We do that only if configuration file exists
  29         # (sometimes ifcfg-xyz isn't needed at all like server-side pppoe pppX interfaces)
  30         if [ "$foundconfig" -eq "1" -a "$DEVICE" -a "$DEVNAME" != "$DEVICE" ]; then
  31                 echo >&2 "$0: DEVICE specified in $CONFIG does not match filename. Aborting!"
  32                 exit 1
  33         fi
  34
  35         if [ "${PREFIX}" ] && [[ "$IPADDR" != */* ]]; then
  36                 IPADDR="$IPADDR/$PREFIX"
  37         fi
  38 }
  39
  40 do_netreport ()
  41 {
  42         # Notify programs that have requested notification
  43         ( cd /var/run/netreport || exit
  44         for i in *; do
  45                 [ -f $i ] && kill -SIGIO $i >/dev/null 2>&1 || \
  46                         rm -f $i >/dev/null 2>&1
  47         done
  48         )
  49 }
  50
  51 need_hostname()
  52 {
  53         local hostname=$(hostname)
  54         if [ "$hostname" = "(none)" -o "$hostname" = "localhost" -o "$hostname" = "localhost.localdomain" ]; then
  55                 NEEDHOSTNAME=yes
  56         else
  57                 unset NEEDHOSTNAME
  58         fi
  59 }
  60
  61 set_hostname()
  62 {
  63         local hostname domain
  64
  65         hostname=$(echo $1 | awk ' { gsub(/\..*$/,NIL); print $0; } ')
  66         domain=$(echo $1 | awk ' { sub(/^[^\.]*\./,NIL); print $0; } ')
  67
  68         if [ "$hostname" ]; then
  69                 echo "$hostname" > /etc/HOSTNAME
  70                 hostname $hostname
  71         fi
  72
  73         if [ "$domain" ]; then
  74                 # XXX umask and possible /etc/resolv.conf symlink breakage
  75                 > /etc/resolv.conf.new
  76                 if ! grep -q "search $domain" /etc/resolv.conf; then
  77                         echo "search $domain" >> /etc/resolv.conf.new
  78                 fi
  79                 echo "domain $domain" >> /etc/resolv.conf.new
  80                 grep -v "^domain " /etc/resolv.conf >> /etc/resolv.conf.new
  81                 mv -f /etc/resolv.conf.new /etc/resolv.conf
  82         fi
  83 }
  84
  85 set_dhcpclient()
  86 {
  87         if [ "$BOOTPROTO" = "bootp" -o "$BOOTPROTO" = "pump" ]; then
  88                 DHCP_CLIENT=/sbin/pump
  89         fi
  90
  91         if [ -z "$DHCP_CLIENT" ]; then
  92                 if [ "$BOOTPROTO" = "zeroconf" -a -x /usr/sbin/avahi-autoipd ]; then
  93                         DHCP_CLIENT=/usr/sbin/avahi-autoipd
  94                 elif [ -x /sbin/dhcpcd ]; then
  95                         DHCP_CLIENT=/sbin/dhcpcd
  96                 elif [ -x /sbin/dhclient ]; then
  97                         DHCP_CLIENT=/sbin/dhclient
  98                 elif [ -x /sbin/dhcpxd ]; then
  99                         DHCP_CLIENT=/sbin/dhcpxd
 100                 elif [ -x /sbin/pump ]; then
 101                         DHCP_CLIENT=/sbin/pump
 102                 elif [ "$BOOTPROTO" = "auto" -a -x /usr/sbin/avahi-autoipd ]; then
 103                         DHCP_CLIENT=/usr/sbin/avahi-autoipd
 104                 else
 105                         nls "Can't find a DHCP client."
 106                         exit 1
 107                 fi
 108         fi
 109 }
 110
 111 # Setup Network Address Translation (NAT)
 112 setup_nat()
 113 {
 114         local src via dst
 115
 116         if [ -r /etc/sysconfig/static-nat ]; then
 117                 if [ "$1" = "on" ]; then
 118                         grep "^[0-9]" /etc/sysconfig/static-nat | while read src via dst; do
 119                                 /sbin/ip route add nat $dst via $src
 120                                 /sbin/ip rule add from $src nat $dst
 121                         done
 122                 elif [ "$1" = "off" ]; then
 123                         LC_ALL=C /sbin/ip route show table all | grep -E "^nat[[:blank:]]" | while read nat dst via src args; do
 124                                 /sbin/ip rule del from $src nat $dst
 125                                 /sbin/ip route del nat $dst via $src
 126                         done
 127                 fi
 128         fi
 129 }
 130
 131 # Setup static ARP
 132 static_arp()
 133 {
 134         local rc arpdev host hwaddr flags neflags
 135
 136         if is_yes "$STATIC_ARP" && [ -r /etc/ethers ]; then
 137                 if [ -x /sbin/arp ]; then
 138                         run_cmd "Setting static ARP entries" /sbin/arp -f /etc/ethers
 139                 else
 140                         show "Setting static ARP entries"; busy
 141                         rc=0
 142                         arpdev=$(ip link show | awk -F':' '(/UP/) && ! (/NOARP/) && ! (/lo:/) && ! (/NONE:/) { print $2; exit }')
 143                         if [ -z "$arpdev" ]; then
 144                                 rc=1
 145                         else
 146                                 # ip supports only ip addresses
 147                                 grep "^[0-9]" /etc/ethers | \
 148                                 while read host hwaddr flags; do
 149                                         case "$flags" in
 150                                           *temp*)
 151                                                 neflags="nud stale"
 152                                                 ;;
 153                                           *)
 154                                                 neflags="nud permanent"
 155                                                 ;;
 156                                         esac
 157                                         if ! /sbin/ip neigh add $host lladdr $hwaddr $neflags dev $arpdev; then
 158                                                 rc=1
 159                                         fi
 160                                 done
 161                         fi
 162                         if [ "$rc" -gt 0 ]; then
 163                                 fail
 164                         fi
 165                 fi
 166         fi
 167 }
 168
 169 static_rarp()
 170 {
 171         if is_yes "$STATIC_RARP"; then
 172                 if [ ! -e /proc/net/rarp ]; then
 173                         _modprobe single rarp
 174                 fi
 175                 if [ -r /etc/ethers -a -x /sbin/rarp ]; then
 176                         run_cmd "Setting static RARP entries" /sbin/rarp -f /etc/ethers
 177                 fi
 178         fi
 179 }
 180
 181 # Set up all IP && IP parameter variables
 182 setup_ip_param ()
 183 {
 184         # detect network device type (ie. dummy, eth for dummy0, eth0 ..)
 185         if [ -z "$DEVICETYPE" ]; then
 186                 DEVICETYPE=$(echo $DEVICE | awk ' { gsub(/[\.:]?[0-9]*[\.:]?[0-9]*$/,NUL); print $0 } ')
 187         fi
 188
 189         # Setup DEVICETYPE for special cases.
 190         if echo ${DEVICE} | LC_ALL=C grep -qE '^[a-z0-9]+\.[0-9]+$'; then
 191                 DEVICETYPE=vlan
 192         fi
 193
 194         # real name of device (ie. is eth0 for eth0,eth0:1,eth0:alias)
 195         SUBDEVICE=$(echo "$DEVICE" | grep -E "([0-9]+:[0-9]+)")
 196         DEVICE=$(echo $DEVICE | awk ' { gsub(/:.*$/,NUL); print $0 } ')
 197
 198         eval IP4ADDR="\$IPADDR${IP4_PRIM_IF:-}"
 199         # check if ipaddr doesn't contain network length -- use $NETMASK then
 200         if [[ "$IP4ADDR" != */* ]] && [ "$NETMASK" ]; then
 201                 IP4ADDR=$IP4ADDR/$(calcprefix $NETMASK)
 202         fi
 203
 204         # check if we have ipv6 or ipv4 address
 205         if [[ "${IP4ADDR}" = *:* ]]; then
 206                 IP6ADDR=${IP4ADDR}
 207                 IP4ADDR=""
 208         else
 209                 eval IP4ADDROPT="\$IP_AOPTS${IP4_PRIM_IF:-}"
 210                 eval IP4ROUTEOPT="\$IP_ROPTS${IP4_PRIM_IF:-}"
 211         fi
 212         if [ "${IP6_PRIM_IF}" ]; then
 213                 eval IP6ADDR="\$IPADDR${IP6_PRIM_IF:-}"
 214                 eval IP6ADDROPT="\$IPV6_AOPTS${IP6_PRIM_IF:-}"
 215                 eval IP6ADDRLABEL="\$IP_LABEL${IP6_PRIM_IF:-}"
 216         fi
 217         if [ "${IP4_SRC_IF}" ]; then
 218                 eval IP4SRCADDR="\$IPADDR${IP4_SRC_IF}"
 219                 IP4SRCADDR=$(echo ${IP4SRCADDR} | awk ' { gsub(/\/.*/,NIL); print "src " $0; } ')
 220         fi
 221
 222         # new rc-scripts 0.4.x option
 223         if [ -z "$HANDLING" ]; then
 224                 HANDLING=0
 225         fi
 226
 227         # set handling for bridge
 228         case "$DEVICETYPE" in
 229           br|atm|lec|irda|vlan)
 230                 HANDLING=1
 231                 ;;
 232         esac
 233
 234         # Multicast ready devices
 235         if is_yes "$MULTICAST"; then
 236                 MULTICAST="on"
 237         else
 238                 case "$DEVICETYPE" in
 239                   eth|br)
 240                         MULTICAST="on"
 241                         ;;
 242                   *)
 243                         MULTICAST="off"
 244                         ;;
 245                 esac
 246         fi
 247
 248         # ARP ready devices
 249         if [ "$ARP" ]; then
 250                 if is_yes "$ARP"; then
 251                         ARP="arp on"
 252                 else
 253                         ARP="arp off"
 254                 fi
 255         fi
 256 }
 257
 258 check_device_down ()
 259 {
 260         if LC_ALL=C ip link show dev ${DEVICE} 2> /dev/null | grep -q UP; then
 261                 return 1
 262         else
 263                 return 0
 264         fi
 265 }
 266
 267 setup_ip_gw_ro ()
 268 {
 269         # IPv4 gateway
 270         if is_yes "$IPV4_NETWORKING"; then
 271                 if [ -z "${GATEWAYDEV}" -o "${GATEWAYDEV}" = "${DEVICE}" ]; then
 272                         # set up default gateway
 273                         if [ "${GATEWAY}" ]; then
 274                                 ip -4 route add default via ${GATEWAY} dev ${DEVICE} ${IP4SRCADDR} onlink 2>/dev/null
 275                                 if [ $? = 0 ]; then
 276                                         DEFGW=${GATEWAY}
 277                                 else
 278                                         # The default gateway could be set via eth0, while bringing up eth1 we shouldn't set default gateway again.
 279                                         # To prevent this message just set GATEWAYDEV=eth0 in /etc/sysconfig/network.
 280                                         nls "Warning: Default gateway already set proably via other interface. Do you need to setup GATEWAYDEV?"
 281                                 fi
 282                         elif [ "${GATEWAYDEV}" = "${DEVICE}" ]; then
 283                                 ip -4 route add default dev ${DEVICE} ${IP4SRCADDR}
 284                         fi
 285                 fi
 286         fi
 287
 288         # IPv6 gateway && IPv6 globalroute
 289         if is_yes "$IPV6_NETWORKING"; then
 290                 if [ -z "${GATEWAY6DEV}" -o "${GATEWAY6DEV}" = "${DEVICE}" ]; then
 291                         # set up default gateway
 292                         if [ "${GATEWAY6}" ]; then
 293                                 ip -6 route add default via ${GATEWAY6} dev ${DEVICE} ${IP6SRCADDR} onlink
 294                                 DEFGW6=${GATEWAY6}
 295                         elif [ "${GATEWAY6DEV}" = "${DEVICE}" ]; then
 296                                 ip -6 route add default dev ${DEVICE} ${IP6SRCADDR}
 297                         fi
 298                 fi
 299                 if [ -z "${IPV6_GLOBALROUTEDEV}" -o "${IPV6_GLOBALROUTEDEV}" = "${DEVICE}" ]; then
 300                         # set up default route
 301                         if [ "${IPV6_GLOBALROUTEGW}" ]; then
 302                                 ip -6 route add 2000::/3 via ${IPV6_GLOBALROUTEGW} dev ${DEVICE} ${IP6SRCADDR} onlink
 303                         elif [ "${IPV6_GLOBALROUTEDEV}" = "${DEVICE}" ]; then
 304                                 ip -6 route add 2000::/3 dev ${DEVICE} ${IP6SRCADDR}
 305                         fi
 306                 fi
 307         fi
 308 }
 309
 310 #
 311 # following function sets up routes not associated to any device
 312 # eg. unreachable or blackhole routes
 313 # (c) 1999 Jacek Konieczny <jajcus@pld-linux.org>
 314 #
 315 setup_routes()
 316 {
 317         local args
 318
 319         if [ -f /etc/sysconfig/static-routes ]; then
 320                 if [ "$1" = "on" -o "$1" = "yes" ]; then
 321                         grep -E "^(none|any)[[:blank:]]" /etc/sysconfig/static-routes | while read device args; do
 322                                 /sbin/ip route add $args
 323                         done
 324                 else
 325                         grep -E "^(none|any)[[:blank:]]" /etc/sysconfig/static-routes | while read device args; do
 326                                 /sbin/ip route del $args 2>/dev/null
 327                         done
 328                 fi
 329         fi
 330 }
 331
 332 # Add ONLY IPv4 address (IPv6 address is added automaticly)
 333 set_up_loopback()
 334 {
 335         if is_yes "$IPV4_NETWORKING"; then
 336                 ip addr add 127.0.0.1/8 dev lo
 337         fi
 338         ip link set dev lo up
 339 }
 340
 341 set_down_loopback()
 342 {
 343         LC_ALL=C ip addr flush dev lo 2>&1 | grep -v "Nothing to flush"
 344         ip link set dev lo down
 345 }
 346
 347 modprobe_net()
 348 {
 349         if is_yes "$IPV6_NETWORKING" && \
 350                 [ "$(awk '$1 ~ /^TCPv6/ { print $8 }' /proc/net/protocols 2> /dev/null)" != "kernel" ] && \
 351                 is_module "ipv6"; then
 352                         _modprobe single ipv6
 353         fi
 354
 355         if is_yes "$IPX" && \
 356                 [ "$(awk '$1 ~ /^IPX/ { print $8 }' /proc/net/protocols 2> /dev/null)" != "kernel" ] && \
 357                 is_module "ipx"; then
 358                         _modprobe single ipx
 359         fi
 360 }
 361
 362 # calculate network prefix from given network mask
 363 calcprefix()
 364 {
 365         local old_IFS netmask prefix endp
 366
 367         old_IFS=$IFS
 368         IFS='.'
 369         netmask=$(echo $1)
 370         IFS=$old_IFS
 371
 372         prefix=0
 373         endp=0
 374         for n in $netmask; do
 375                 for i in 128 64 32 16 8 4 2 1; do
 376                         if [ $(($n & $i)) -ne 0 ]; then
 377                                 if [ $endp -eq 0 ]; then
 378                                         prefix=$(($prefix + 1))
 379                                 else
 380                                         echo "32"
 381                                         return
 382                                 fi
 383                         else
 384                                 endp=1
 385                         fi
 386                 done
 387         done
 388         echo $prefix
 389 }
 390
 391 # calculate network mask from given prefix
 392 # (c) 1999 Grzegorz Stanislawski <stangrze@open.net.pl>
 393 calcnetmask()
 394 {
 395         local prefix a MASK
 396
 397         MASK=""
 398         if [ "${1##[0-9]*}" ]; then
 399                 prefix=32
 400         else
 401                 prefix=$1
 402         fi
 403         for i in 1 2 3 4; do
 404                 case $prefix in
 405                   7)    a=254;;
 406                   6)    a=252;;
 407                   5)    a=248;;
 408                   4)    a=240;;
 409                   3)    a=224;;
 410                   2)    a=192;;
 411                   1)    a=128;;
 412                   *)
 413                         [ $prefix -ge 8 ] && a=255
 414                         [ $prefix -le 0 ] && a=0
 415                         ;;
 416                 esac
 417
 418                 prefix="$(( $prefix - 8))"
 419                 if [ -z "$MASK" ]; then
 420                         MASK=$a
 421                 else
 422                         MASK=$MASK.$a
 423                 fi
 424         done
 425
 426         echo $MASK
 427         return
 428 }
 429
 430 # Retrievies PPPD PID and real interface name from /var/run/ppp-*.pid
 431 get_ppp_device_and_pid ()
 432 {
 433         if [ -f "/var/run/ppp-$DEVNAME.pid" ]; then
 434                 eval $(
 435                 {
 436                         read PID; echo "PID='$PID'"
 437                         read REALDEVICE; echo "REALDEVICE=$REALDEVICE"
 438                 } < "/var/run/ppp-$DEVNAME.pid")
 439         fi
 440
 441         if [ -z "$REALDEVICE" ]; then
 442                 REALDEVICE=$DEVICE
 443         fi
 444 }
 445
 446 # following function setups advanced routing rules
 447 # Olgierd Pieczul <wojrus@pld-linux.org>
 448 setup_ip_rules ()
 449 {
 450         local args prio from src
 451
 452         if [ -f /etc/sysconfig/static-routes ]; then
 453                 if is_yes "$1"; then
 454                         grep -E "^(from|to|iif|tos|fwmark|dev|pref|priority|prio)[[:blank:]]" /etc/sysconfig/static-routes | while read args; do
 455                                 /sbin/ip rule add $args
 456                         done
 457                 elif is_no "$1"; then
 458                         LC_ALL=C /sbin/ip rule show | grep -vE -e "from all lookup (main|default|local) \$" -e " map-to " | while read prio from src args; do
 459                                 [ "$src" = "all" ] && ip rule delete $args || ip rule delete $from $src $args
 460                         done
 461                 fi
 462         fi
 463 }
 464
 465 is_wireless_device ()
 466 {
 467         if [ -x /sbin/iwconfig ]; then
 468                 LC_ALL=C iwconfig "${1}" 2>&1 | grep -q "no wireless extensions" || return 0
 469         fi
 470         return 1
 471 }
 472
 473 wireless_param()
 474 {
 475         device="$1"
 476         if [ "$2" = "br" ]; then
 477                 prefix="${device}_"
 478         else
 479                 prefix=""
 480         fi
 481
 482         local val wlan_mode
 483
 484         # wlan mode needs to be first
 485         wlan_mode="$(eval echo \$${prefix}WLAN_MODE)" && [ "$wlan_mode" ] && \
 486                 iwconfig ${device} mode "$wlan_mode"
 487
 488         val="$(eval echo \$${prefix}WLAN_NICKNAME)" && [ "$val" ] && \
 489                 iwconfig ${device} nick "$val"
 490
 491         val="$(eval echo \$${prefix}WLAN_NWID)" && [ "$val" ] && \
 492                 iwconfig ${device} nwid "$val"
 493
 494         if [ "$wlan_mode" != "Managed" -a "$wlan_mode" != "managed" ]; then
 495                 if val="$(eval echo \$${prefix}WLAN_FREQ)" && [ "$val" ]; then
 496                         iwconfig ${device} freq "$val"
 497                 elif val="$(eval echo \$${prefix}WLAN_CHANNEL)" && [ "$val" ]; then
 498                         iwconfig ${device} channel "$val"
 499                 fi
 500         fi
 501
 502         val="$(eval echo \$${prefix}WLAN_SENS)" && [ "$val" ] && \
 503                 iwconfig ${device} sens "$val"
 504         val="$(eval echo \$${prefix}WLAN_AP)" && [ "$val" ] && \
 505                 iwconfig ${device} ap "$val"
 506         val="$(eval echo \$${prefix}WLAN_BITRATE)" && [ "$val" ] && \
 507                 iwconfig ${device} rate "$val"
 508         val="$(eval echo \$${prefix}WLAN_RTS_THRESHOLD)" && [ "$val" ] && \
 509                 iwconfig ${device} rts "$val"
 510         val="$(eval echo \$${prefix}WLAN_FRAGMENTATION_THRESHOLD)" && [ "$val" ] && \
 511                 iwconfig ${device} frag "$val"
 512
 513         local wlan_encryption="$(eval echo \$${prefix}WLAN_ENCRYPTION)"
 514         local wlan_key="$(eval echo \$${prefix}WLAN_KEY)"
 515         # TODO: well, actually shouldn't set WLAN_KEY if other keys than current are set
 516         if [ "$wlan_key" ]; then
 517                 # wlan key can contain index of key to set
 518                 # to set other than current keys suffix with 1-4:
 519                 local idx
 520                 for idx in 1 2 3 4; do
 521                         val="$(eval echo \$${prefix}WLAN_KEY_$idx)"
 522                         [ "$val" ] || continue
 523                         iwconfig ${device} key "[$idx]" "$val"
 524                 done
 525                 if val="$(eval echo \$${prefix}WLAN_KEY_CURRENT)" && [ "$val" ]; then
 526                         iwconfig ${device} key "[$val]"
 527                 else
 528                         iwconfig ${device} key "$wlan_key"
 529                 fi
 530
 531                 [ "$wlan_encryption" ] && iwconfig ${device} key "$wlan_encryption"
 532         fi
 533
 534         if is_no "$wlan_encryption"; then
 535                 iwconfig ${device} key off
 536         fi
 537         val="$(eval echo \$${prefix}WLAN_POWER)" && [ "$val" ] && \
 538                 iwconfig ${device} power "$val"
 539         val="$(eval echo \$${prefix}WLAN_TXPOWER)" && [ "$val" ] && \
 540                 iwconfig ${device} txpower "$val"
 541         val="$(eval echo \$${prefix}WLAN_RETRY)" && [ "$val" ] && \
 542                 iwconfig ${device} retry "$val"
 543
 544         # essid should be last due to network rescanning by wlan devices
 545         val="$(eval echo \$${prefix}WLAN_ESSID)" && [ "$val" ] && \
 546                 iwconfig ${device} essid "$val"
 547
 548         if is_yes "$(eval echo \$${prefix}WLAN_COMMIT)"; then
 549                 iwconfig ${device} commit
 550         fi
 551 }
 552
 553 # returns
 554 # 0 - no link
 555 # 1 - link ok
 556 # 2 - unsupported, unknown return
 557 check_mii_tool ()
 558 {
 559         [ -x /sbin/mii-tool ] || return 2
 560         local output=$(LC_ALL=C mii-tool $1 2>&1)
 561         echo $output | grep -q "link ok" && return 1
 562         echo $output | grep -q "no link" && return 0
 563         return 2
 564 }
 565
 566 # returns
 567 # 0 - link off
 568 # 1 - link on
 569 # 2 - unsupported, unknown return
 570 check_ethtool ()
 571 {
 572         [ -x /sbin/ethtool ] || return 2
 573         local output=$(LC_ALL=C ethtool $1 2>&1)
 574         echo $output | grep -q "Link detected: yes" && return 1
 575         echo $output | grep -q "Link detected: no" && return 0
 576         return 2
 577 }
 578
 579 # returns
 580 # 0 - radio off
 581 # 1 - radio on
 582 # 2 - unsupported
 583 check_iwconfig ()
 584 {
 585         local output
 586         # rfkill state (are there devices with multiple rfkill buttons?)
 587         output=$(cat /sys/class/net/${1}/device/rfkill*/state 2> /dev/null)
 588         # 1 is rfkill not active
 589         [ "$output" = "1" ] && return 1
 590         [ "$output" = "0" -o "$output" = "2" ] && return 0
 591         [ -x /sbin/iwconfig ] || return 2
 592         output=$(LC_ALL=C iwconfig "$1" 2>&1)
 593         # "radio off" is ipwxxx only "feature" (and there is no "radio on")
 594         echo "$output" | grep -q "radio off" && return 0
 595         # XXX: need more generic checks for wifi
 596         return 2
 597 }
 598
 599 # returns
 600 # 0 - link down
 601 # 1 - link up
 602 # 2 - unknown/unsupported
 603 check_link_down ()
 604 {
 605         local e i m timeout device max_timeout
 606         device="$1"
 607         max_timeout="$2"
 608
 609         if [ ! -x /sbin/mii-tool -a ! -x /sbin/ethtool -a ! -x /sbin/iwconfig ]; then
 610                 return 2
 611         fi
 612
 613         [ -z "$max_timeout" ] && max_timeout=6
 614
 615         if ! LC_ALL=C ip link show dev $device 2>/dev/null | grep -q UP; then
 616                 ip link set dev $device up >/dev/null 2>&1
 617         fi
 618         timeout=0
 619         while [ $timeout -le $max_timeout ]; do
 620                 check_ethtool $device
 621                 e=$?
 622                 check_iwconfig $device
 623                 i=$?
 624                 # trust ethtool and iwconfig
 625                 if [ $i -eq 1 ] || [ $e -eq 1 ]; then
 626                         return 1
 627                 fi
 628                 # use mii check only if all other check are unsupported
 629                 # (mii check lies too often)
 630                 check_mii_tool $device
 631                 m=$?
 632                 if [ $m -eq 1 ] && [ $i -eq 2 ] && [ $e -eq 2 ]; then
 633                         return 1
 634                 fi
 635                 usleep 500000
 636                 timeout=$((timeout+1))
 637         done
 638         # do not abort dhclient if all the checks are unsupported
 639         if [ $m -eq 2 ] && [ $i -eq 2 ] && [ $e -eq 2 ]; then
 640                 return 2
 641         fi
 642         return 0
 643 }