lib/functions.network

   1 #!/bin/sh - keep it for file(1) to get bourne shell script result
   2 #
   3 #
   4 # This is not a shell script; it provides functions to network scripts
   5 # that source it.
   6
   7 source_config ()
   8 {
   9         local foundconfig=0
  10
  11         DEVNAME=${CONFIG##*/}
  12         DEVNAME=${DEVNAME##ifcfg-}
  13         DEVNAME=${DEVNAME##tnlcfg-}
  14
  15         if [[ "$CONFIG" = /* ]]; then
  16                 if [ -f "$CONFIG" ]; then
  17                         . "$CONFIG"
  18                         foundconfig=1
  19                 fi
  20         elif [ -f "/etc/sysconfig/interfaces/$CONFIG" ]; then
  21                 . "/etc/sysconfig/interfaces/$CONFIG"
  22                 foundconfig=1
  23         fi
  24
  25         # This is sanity check so that if you've copied ifcfg-eth0 to ifcfg-eth1
  26         # and forgot to alter DEVICE= line you won't accidentally bring down eth0
  27         # while executing ifdown eth1. We do that only if configuration file exists
  28         # (sometimes ifcfg-xyz isn't needed at all like server-side pppoe pppX interfaces)
  29         if [ "$foundconfig" -eq "1" -a "$DEVICE" -a "$DEVNAME" != "$DEVICE" ]; then
  30                 echo >&2 "$0: DEVICE specified in $CONFIG does not match filename. Aborting!"
  31                 exit 1
  32         fi
  33
  34         if [ "${PREFIX}" ] && [[ "$IPADDR" != */* ]]; then
  35                 IPADDR="$IPADDR/$PREFIX"
  36         fi
  37 }
  38
  39 do_netreport ()
  40 {
  41         # Notify programs that have requested notification
  42         ( cd /var/run/netreport || exit
  43         for i in *; do
  44                 [ -f $i ] && kill -SIGIO $i >/dev/null 2>&1 || \
  45                         rm -f $i >/dev/null 2>&1
  46         done
  47         )
  48 }
  49
  50 need_hostname()
  51 {
  52         local hostname=$(hostname)
  53         if [ "$hostname" = "(none)" -o "$hostname" = "localhost" -o "$hostname" = "localhost.localdomain" ]; then
  54                 NEEDHOSTNAME=yes
  55         else
  56                 unset NEEDHOSTNAME
  57         fi
  58 }
  59
  60 set_hostname()
  61 {
  62         local hostname domain
  63
  64         hostname=$(echo $1 | awk ' { gsub(/\..*$/,NIL); print $0; } ')
  65         domain=$(echo $1 | awk ' { sub(/^[^\.]*\./,NIL); print $0; } ')
  66
  67         if [ "$hostname" ]; then
  68                 echo "$hostname" > /etc/HOSTNAME
  69                 hostname $hostname
  70         fi
  71
  72         if [ "$domain" ]; then
  73                 # XXX umask and possible /etc/resolv.conf symlink breakage
  74                 > /etc/resolv.conf.new
  75                 if ! grep -Fq "search $domain" /etc/resolv.conf; then
  76                         echo "search $domain" >> /etc/resolv.conf.new
  77                 fi
  78                 echo "domain $domain" >> /etc/resolv.conf.new
  79                 grep -v "^domain " /etc/resolv.conf >> /etc/resolv.conf.new
  80                 mv -f /etc/resolv.conf.new /etc/resolv.conf
  81         fi
  82 }
  83
  84 set_dhcpclient()
  85 {
  86         if [ "$BOOTPROTO" = "bootp" -o "$BOOTPROTO" = "pump" ]; then
  87                 DHCP_CLIENT=/sbin/pump
  88         fi
  89
  90         if [ -z "$DHCP_CLIENT" ]; then
  91                 if [ "$BOOTPROTO" = "zeroconf" -a -x /usr/sbin/avahi-autoipd ]; then
  92                         DHCP_CLIENT=/usr/sbin/avahi-autoipd
  93                 elif [ -x /sbin/dhcpcd ]; then
  94                         DHCP_CLIENT=/sbin/dhcpcd
  95                 elif [ -x /sbin/dhclient ]; then
  96                         DHCP_CLIENT=/sbin/dhclient
  97                 elif [ -x /sbin/dhcpxd ]; then
  98                         DHCP_CLIENT=/sbin/dhcpxd
  99                 elif [ -x /sbin/pump ]; then
 100                         DHCP_CLIENT=/sbin/pump
 101                 elif [ "$BOOTPROTO" = "auto" -a -x /usr/sbin/avahi-autoipd ]; then
 102                         DHCP_CLIENT=/usr/sbin/avahi-autoipd
 103                 else
 104                         nls "Can't find a DHCP client."
 105                         exit 1
 106                 fi
 107         fi
 108 }
 109
 110 # Setup Network Address Translation (NAT)
 111 setup_nat()
 112 {
 113         local src via dst
 114
 115         if [ -r /etc/sysconfig/static-nat ]; then
 116                 if [ "$1" = "on" ]; then
 117                         grep "^[0-9]" /etc/sysconfig/static-nat | while read src via dst; do
 118                                 /sbin/ip route add nat $dst via $src
 119                                 /sbin/ip rule add from $src nat $dst
 120                         done
 121                 elif [ "$1" = "off" ]; then
 122                         LC_ALL=C /sbin/ip route show table all | grep -E "^nat[[:blank:]]" | while read nat dst via src args; do
 123                                 /sbin/ip rule del from $src nat $dst
 124                                 /sbin/ip route del nat $dst via $src
 125                         done
 126                 fi
 127         fi
 128 }
 129
 130 # Setup static ARP
 131 static_arp()
 132 {
 133         local rc arpdev host hwaddr flags neflags
 134
 135         if is_yes "$STATIC_ARP" && [ -r /etc/ethers ]; then
 136                 if [ -x /sbin/arp ]; then
 137                         run_cmd "Setting static ARP entries" /sbin/arp -f /etc/ethers
 138                 else
 139                         show "Setting static ARP entries"; busy
 140                         rc=0
 141                         arpdev=$(ip link show | awk -F':' '(/UP/) && ! (/NOARP/) && ! (/lo:/) && ! (/NONE:/) { print $2; exit }')
 142                         if [ -z "$arpdev" ]; then
 143                                 rc=1
 144                         else
 145                                 # ip supports only ip addresses
 146                                 grep "^[0-9]" /etc/ethers | \
 147                                 while read host hwaddr flags; do
 148                                         case "$flags" in
 149                                           *temp*)
 150                                                 neflags="nud stale"
 151                                                 ;;
 152                                           *)
 153                                                 neflags="nud permanent"
 154                                                 ;;
 155                                         esac
 156                                         if ! /sbin/ip neigh add $host lladdr $hwaddr $neflags dev $arpdev; then
 157                                                 rc=1
 158                                         fi
 159                                 done
 160                         fi
 161                         if [ "$rc" -gt 0 ]; then
 162                                 fail
 163                         fi
 164                 fi
 165         fi
 166 }
 167
 168 static_rarp()
 169 {
 170         if is_yes "$STATIC_RARP"; then
 171                 if [ ! -e /proc/net/rarp ]; then
 172                         _modprobe single rarp
 173                 fi
 174                 if [ -r /etc/ethers -a -x /sbin/rarp ]; then
 175                         run_cmd "Setting static RARP entries" /sbin/rarp -f /etc/ethers
 176                 fi
 177         fi
 178 }
 179
 180 # Set up all IP && IP parameter variables
 181 setup_ip_param ()
 182 {
 183         # detect network device type (ie. dummy, eth for dummy0, eth0 ..)
 184         if [ -z "$DEVICETYPE" ]; then
 185                 # If there's a dot, it's a vlan
 186                 if echo ${DEVICE} | LC_ALL=C grep -qE '^[a-z0-9]+\.[0-9]+$'; then
 187                         DEVICETYPE=vlan
 188                 else
 189                         DEVICETYPE=$(echo $DEVICE | awk ' { gsub(/[\.:]?[0-9]*[\.:]?[0-9]*$/,NUL); print $0 } ')
 190                 fi
 191         fi
 192
 193
 194         # real name of device (ie. is eth0 for eth0,eth0:1,eth0:alias)
 195         SUBDEVICE=$(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 "$DEVICETYPE" in
 229           bond|br|atm|lec|irda|vlan)
 230                 HANDLING=1
 231                 ;;
 232         esac
 233
 234         # Multicast ready devices
 235         if [ -n "$MULTICAST" ]; then
 236                 MULTICAST="$MULTICAST"
 237         else
 238                 case "$DEVICETYPE" in
 239                   eth|br|vlan)
 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 ${DEVICE} 2> /dev/null | grep -Fq UP; then
 261                 return 1
 262         else
 263                 return 0
 264         fi
 265 }
 266
 267 setup_ip_gw_ro ()
 268 {
 269         # IPv4 gateway
 270         if is_yes "$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 ${IPV6_GLOBALROUTEGW} dev ${DEVICE} ${IP6SRCADDR} onlink
 303                                 ip -6 route add 2000::/3 via ${IPV6_GLOBALROUTEGW} dev ${DEVICE} ${IP6SRCADDR} onlink
 304                         elif [ "${IPV6_GLOBALROUTEDEV}" = "${DEVICE}" ]; then
 305                                 ip -6 route add 2000::/3 dev ${DEVICE} ${IP6SRCADDR}
 306                         fi
 307                 fi
 308         fi
 309 }
 310
 311 #
 312 # following function sets up routes not associated to any device
 313 # eg. unreachable or blackhole routes
 314 # (c) 1999 Jacek Konieczny <jajcus@pld-linux.org>
 315 #
 316 setup_routes()
 317 {
 318         local args
 319
 320         if [ -f /etc/sysconfig/static-routes ]; then
 321                 if [ "$1" = "on" -o "$1" = "yes" ]; then
 322                         grep -E "^(none|any)[[:blank:]]" /etc/sysconfig/static-routes | while read device args; do
 323                                 /sbin/ip route add $args
 324                         done
 325                 else
 326                         grep -E "^(none|any)[[:blank:]]" /etc/sysconfig/static-routes | while read device args; do
 327                                 /sbin/ip route del $args 2>/dev/null
 328                         done
 329                 fi
 330         fi
 331         is_no "$IPV6_NETWORKING" && return
 332         if [ -f /etc/sysconfig/static-routes6 ]; then
 333                 if [ "$1" = "on" -o "$1" = "yes" ]; then
 334                         grep -E "^(none|any)[[:blank:]]" /etc/sysconfig/static-routes6 | while read device args; do
 335                                 /sbin/ip -6 route add $args
 336                         done
 337                 else
 338                         grep -E "^(none|any)[[:blank:]]" /etc/sysconfig/static-routes6 | while read device args; do
 339                                 /sbin/ip -6 route del $args 2>/dev/null
 340                         done
 341                 fi
 342         fi
 343 }
 344
 345 # Add ONLY IPv4 address (IPv6 address is added automaticly)
 346 set_up_loopback()
 347 {
 348         # test if addr is assigned already as lxd(lxc?) initializes loopback upfront
 349         if is_yes "$IPV4_NETWORKING" && ! ip addr show lo | grep -q "127\.0\.0\.1"; then
 350                 ip addr add 127.0.0.1/8 dev lo
 351         fi
 352         ip link set dev lo up
 353
 354         grep -E "^(lo|any)[[:blank:]]" /etc/sysconfig/static-routes | while read device args; do
 355                 if [[ "$args" = *:* ]]; then
 356                         is_no "$IPV6_NETWORKING" && continue
 357                 else
 358                         is_no "$IPV4_NETWORKING" && continue
 359                 fi
 360                 /sbin/ip route add $args dev lo
 361         done
 362         is_no "$IPV6_NETWORKING" && return
 363         grep -E "^(lo|any)[[:blank:]]" /etc/sysconfig/static-routes6 | while read device args; do
 364                 /sbin/ip -6 route add $args dev lo
 365         done
 366 }
 367
 368 set_down_loopback()
 369 {
 370         LC_ALL=C ip addr flush dev lo 2>&1 | grep -v "Nothing to flush"
 371         ip link set dev lo down
 372 }
 373
 374 modprobe_net()
 375 {
 376         if is_yes "$IPV6_NETWORKING" && is_module "ipv6"; then
 377                 _modprobe single ipv6
 378         fi
 379
 380         if is_yes "$IPX" && is_module "ipx"; then
 381                 _modprobe single ipx
 382         fi
 383 }
 384
 385 # calculate network prefix from given network mask
 386 calcprefix()
 387 {
 388         local old_IFS netmask prefix endp
 389
 390         old_IFS=$IFS
 391         IFS='.'
 392         netmask=$(echo $1)
 393         IFS=$old_IFS
 394
 395         prefix=0
 396         endp=0
 397         for n in $netmask; do
 398                 for i in 128 64 32 16 8 4 2 1; do
 399                         if [ $(($n & $i)) -ne 0 ]; then
 400                                 if [ $endp -eq 0 ]; then
 401                                         prefix=$(($prefix + 1))
 402                                 else
 403                                         echo "32"
 404                                         return
 405                                 fi
 406                         else
 407                                 endp=1
 408                         fi
 409                 done
 410         done
 411         echo $prefix
 412 }
 413
 414 # calculate network mask from given prefix
 415 # (c) 1999 Grzegorz Stanislawski <stangrze@open.net.pl>
 416 calcnetmask()
 417 {
 418         local prefix a MASK
 419
 420         MASK=""
 421         if [ "${1##[0-9]*}" ]; then
 422                 prefix=32
 423         else
 424                 prefix=$1
 425         fi
 426         for i in 1 2 3 4; do
 427                 case $prefix in
 428                   7)    a=254;;
 429                   6)    a=252;;
 430                   5)    a=248;;
 431                   4)    a=240;;
 432                   3)    a=224;;
 433                   2)    a=192;;
 434                   1)    a=128;;
 435                   *)
 436                         [ $prefix -ge 8 ] && a=255
 437                         [ $prefix -le 0 ] && a=0
 438                         ;;
 439                 esac
 440
 441                 prefix="$(( $prefix - 8))"
 442                 if [ -z "$MASK" ]; then
 443                         MASK=$a
 444                 else
 445                         MASK=$MASK.$a
 446                 fi
 447         done
 448
 449         echo $MASK
 450         return
 451 }
 452
 453 # Retrievies PPPD PID and real interface name from /var/run/ppp-*.pid
 454 get_ppp_device_and_pid ()
 455 {
 456         if [ -f "/var/run/ppp-$DEVNAME.pid" ]; then
 457                 eval $(
 458                 {
 459                         read PID; echo "PID='$PID'"
 460                         read REALDEVICE; echo "REALDEVICE=$REALDEVICE"
 461                 } < "/var/run/ppp-$DEVNAME.pid")
 462         fi
 463
 464         if [ -z "$REALDEVICE" ]; then
 465                 REALDEVICE=$DEVICE
 466         fi
 467 }
 468
 469 # following function setups advanced routing rules
 470 # Olgierd Pieczul <wojrus@pld-linux.org>
 471 setup_ip_rules ()
 472 {
 473         local args prio from src i prio
 474
 475         if [ -f /etc/sysconfig/static-routes ]; then
 476                 if is_yes "$1"; then
 477                         i=10000
 478                         grep -E "^(from|to|iif|tos|fwmark|dev|pref|priority|prio)[[:blank:]]" /etc/sysconfig/static-routes | while read args; do
 479                                 prio=""
 480                                 if [ "${args##* prio }" = "$args" ]; then
 481                                         # no "prio" used in rule, use own prio
 482                                         prio="prio $i"
 483                                         i=$((i + 5))
 484                                 fi
 485                                 /sbin/ip rule add $args $prio
 486                         done
 487                 elif is_no "$1"; then
 488                         LC_ALL=C /sbin/ip rule show | grep -vE -e "from all lookup (main|default|local|253|254|255)[[:space:]]*\$" -e " map-to " | while read prio from src args; do
 489                                 [ "$src" = "all" ] && /sbin/ip rule delete $args || /sbin/ip rule delete $from $src $args
 490                         done
 491                 fi
 492         fi
 493         is_no "$IPV6_NETWORKING" && return
 494         if [ -f /etc/sysconfig/static-routes6 ]; then
 495                 if is_yes "$1"; then
 496                         i=10000
 497                         grep -E "^(from|to|iif|tos|fwmark|dev|pref|priority|prio)[[:blank:]]" /etc/sysconfig/static-routes6 | while read args; do
 498                                 prio=""
 499                                 if [ "${args##* prio }" = "$args" ]; then
 500                                         # no "prio" used in rule, use own prio
 501                                         prio="prio $i"
 502                                         i=$((i + 5))
 503                                 fi
 504                                 /sbin/ip -6 rule add $args $prio
 505                         done
 506                 elif is_no "$1"; then
 507                         LC_ALL=C /sbin/ip -6 rule show | grep -vE -e "from all lookup (main|default|local|253|254|255)[[:space:]]*\$" -e " map-to " | while read prio from src args; do
 508                                 [ "$src" = "all" ] && /sbin/ip -6 rule delete $args || /sbin/ip -6 rule delete $from $src $args
 509                         done
 510                 fi
 511         fi
 512 }
 513
 514 is_wireless_device ()
 515 {
 516         if [ -x /sbin/iwconfig ]; then
 517                 LC_ALL=C iwconfig "${1}" 2>&1 | grep -Fq "no wireless extensions" || return 0
 518         fi
 519         return 1
 520 }
 521
 522 wireless_param()
 523 {
 524         device="$1"
 525         if [ "$2" = "br" ]; then
 526                 prefix="${device}_"
 527         else
 528                 prefix=""
 529         fi
 530
 531         local val wlan_mode
 532
 533         # wlan mode needs to be first
 534         wlan_mode="$(eval echo \$${prefix}WLAN_MODE)" && [ "$wlan_mode" ] && \
 535                 iwconfig ${device} mode "$wlan_mode"
 536
 537         val="$(eval echo \$${prefix}WLAN_NICKNAME)" && [ "$val" ] && \
 538                 iwconfig ${device} nick "$val"
 539
 540         val="$(eval echo \$${prefix}WLAN_NWID)" && [ "$val" ] && \
 541                 iwconfig ${device} nwid "$val"
 542
 543         if [ "$wlan_mode" != "Managed" -a "$wlan_mode" != "managed" ]; then
 544                 if val="$(eval echo \$${prefix}WLAN_FREQ)" && [ "$val" ]; then
 545                         iwconfig ${device} freq "$val"
 546                 elif val="$(eval echo \$${prefix}WLAN_CHANNEL)" && [ "$val" ]; then
 547                         iwconfig ${device} channel "$val"
 548                 fi
 549         fi
 550
 551         val="$(eval echo \$${prefix}WLAN_SENS)" && [ "$val" ] && \
 552                 iwconfig ${device} sens "$val"
 553         val="$(eval echo \$${prefix}WLAN_AP)" && [ "$val" ] && \
 554                 iwconfig ${device} ap "$val"
 555         val="$(eval echo \$${prefix}WLAN_BITRATE)" && [ "$val" ] && \
 556                 iwconfig ${device} rate "$val"
 557         val="$(eval echo \$${prefix}WLAN_RTS_THRESHOLD)" && [ "$val" ] && \
 558                 iwconfig ${device} rts "$val"
 559         val="$(eval echo \$${prefix}WLAN_FRAGMENTATION_THRESHOLD)" && [ "$val" ] && \
 560                 iwconfig ${device} frag "$val"
 561
 562         local wlan_encryption="$(eval echo \$${prefix}WLAN_ENCRYPTION)"
 563         local wlan_key="$(eval echo \$${prefix}WLAN_KEY)"
 564         # TODO: well, actually shouldn't set WLAN_KEY if other keys than current are set
 565         if [ "$wlan_key" ]; then
 566                 # wlan key can contain index of key to set
 567                 # to set other than current keys suffix with 1-4:
 568                 local idx
 569                 for idx in 1 2 3 4; do
 570                         val="$(eval echo \$${prefix}WLAN_KEY_$idx)"
 571                         [ "$val" ] || continue
 572                         iwconfig ${device} key "[$idx]" "$val"
 573                 done
 574                 if val="$(eval echo \$${prefix}WLAN_KEY_CURRENT)" && [ "$val" ]; then
 575                         iwconfig ${device} key "[$val]"
 576                 else
 577                         iwconfig ${device} key "$wlan_key"
 578                 fi
 579
 580                 [ "$wlan_encryption" ] && iwconfig ${device} key "$wlan_encryption"
 581         fi
 582
 583         if is_no "$wlan_encryption"; then
 584                 iwconfig ${device} key off
 585         fi
 586         val="$(eval echo \$${prefix}WLAN_POWER)" && [ "$val" ] && \
 587                 iwconfig ${device} power "$val"
 588         val="$(eval echo \$${prefix}WLAN_TXPOWER)" && [ "$val" ] && \
 589                 iwconfig ${device} txpower "$val"
 590         val="$(eval echo \$${prefix}WLAN_RETRY)" && [ "$val" ] && \
 591                 iwconfig ${device} retry "$val"
 592
 593         # essid should be last due to network rescanning by wlan devices
 594         val="$(eval echo \$${prefix}WLAN_ESSID)" && [ "$val" ] && \
 595                 iwconfig ${device} essid "$val"
 596
 597         if is_yes "$(eval echo \$${prefix}WLAN_COMMIT)"; then
 598                 iwconfig ${device} commit
 599         fi
 600 }
 601
 602 # returns
 603 # 0 - no link
 604 # 1 - link ok
 605 # 2 - unsupported, unknown return
 606 check_mii_tool ()
 607 {
 608         [ -x /sbin/mii-tool ] || return 2
 609         local output=$(LC_ALL=C mii-tool $1 2>&1)
 610         echo $output | grep -Fq "link ok" && return 1
 611         echo $output | grep -Fq "no link" && return 0
 612         return 2
 613 }
 614
 615 # returns
 616 # 0 - link off
 617 # 1 - link on
 618 # 2 - unsupported, unknown return
 619 check_ethtool ()
 620 {
 621         [ -x /sbin/ethtool ] || return 2
 622         local output=$(LC_ALL=C ethtool $1 2>&1)
 623         echo $output | grep -Fq "Link detected: yes" && return 1
 624         echo $output | grep -Fq "Link detected: no" && return 0
 625         return 2
 626 }
 627
 628 # returns
 629 # 0 - radio off
 630 # 1 - radio on
 631 # 2 - unsupported
 632 check_iwconfig ()
 633 {
 634         local output
 635         # rfkill state (are there devices with multiple rfkill buttons?)
 636         output=$(cat /sys/class/net/${1}/device/rfkill*/state 2> /dev/null)
 637         # 1 is rfkill not active
 638         [ "$output" = "1" ] && return 1
 639         [ "$output" = "0" -o "$output" = "2" ] && return 0
 640         [ -x /sbin/iwconfig ] || return 2
 641         output=$(LC_ALL=C iwconfig "$1" 2>&1)
 642         # "radio off" is ipwxxx only "feature" (and there is no "radio on")
 643         echo "$output" | grep -Fq "radio off" && return 0
 644         # XXX: need more generic checks for wifi
 645         return 2
 646 }
 647
 648 # returns
 649 # 0 - link down
 650 # 1 - link up
 651 # 2 - unknown/unsupported
 652 check_link_down ()
 653 {
 654         local e i m timeout device max_timeout
 655         device="$1"
 656         max_timeout="$2"
 657
 658         if [ ! -x /sbin/mii-tool -a ! -x /sbin/ethtool -a ! -x /sbin/iwconfig ]; then
 659                 return 2
 660         fi
 661
 662         [ -z "$max_timeout" ] && max_timeout=10
 663
 664         if ! LC_ALL=C ip link show dev $device 2>/dev/null | grep -Fq UP; then
 665                 ip link set dev $device up >/dev/null 2>&1
 666         fi
 667         timeout=0
 668         while [ $timeout -le $max_timeout ]; do
 669                 check_ethtool $device
 670                 e=$?
 671                 check_iwconfig $device
 672                 i=$?
 673                 # trust ethtool and iwconfig
 674                 if [ $i -eq 1 ] || [ $e -eq 1 ]; then
 675                         return 1
 676                 fi
 677                 # use mii check only if all other check are unsupported
 678                 # (mii check lies too often)
 679                 check_mii_tool $device
 680                 m=$?
 681                 if [ $m -eq 1 ] && [ $i -eq 2 ] && [ $e -eq 2 ]; then
 682                         return 1
 683                 fi
 684                 usleep 500000
 685                 timeout=$((timeout+1))
 686         done
 687         # do not abort dhclient if all the checks are unsupported
 688         if [ $m -eq 2 ] && [ $i -eq 2 ] && [ $e -eq 2 ]; then
 689                 return 2
 690         fi
 691         return 0
 692 }