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 "$DEVICETYPE" in
 229           br|atm|lec|irda|vlan)
 230                 HANDLING=1
 231                 ;;
 232         esac
 233
 234         # Multicast ready devices
 235         if is_yes "$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 ${DEVICE} 2> /dev/null | grep -Fq UP; then
 261                 return 1
 262         else
 263                 return 0
 264         fi
 265 }
 266
 267 setup_ip_gw_ro ()
 268 {
 269         # IPv4 gateway
 270         if is_yes "$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 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 $args 2>/dev/null
 327                         done
 328                 fi
 329         fi
 330         is_no "$IPV6_NETWORKING" && return
 331         if [ -f /etc/sysconfig/static-routes6 ]; then
 332                 if [ "$1" = "on" -o "$1" = "yes" ]; then
 333                         grep -E "^(none|any)[[:blank:]]" /etc/sysconfig/static-routes6 | while read device args; do
 334                                 /sbin/ip -6 route add $args
 335                         done
 336                 else
 337                         grep -E "^(none|any)[[:blank:]]" /etc/sysconfig/static-routes6 | while read device args; do
 338                                 /sbin/ip -6 route del $args 2>/dev/null
 339                         done
 340                 fi
 341         fi
 342 }
 343
 344 # Add ONLY IPv4 address (IPv6 address is added automaticly)
 345 set_up_loopback()
 346 {
 347         if is_yes "$IPV4_NETWORKING"; then
 348                 ip addr add 127.0.0.1/8 dev lo
 349         fi
 350         ip link set dev lo up
 351
 352         grep -E "^(lo|any)[[:blank:]]" /etc/sysconfig/static-routes | while read device args; do
 353                 if [[ "$args" = *:* ]]; then
 354                         is_no "$IPV6_NETWORKING" && continue
 355                 else
 356                         is_no "$IPV4_NETWORKING" && continue
 357                 fi
 358                 /sbin/ip route add $args dev lo
 359         done
 360         is_no "$IPV6_NETWORKING" && return
 361         grep -E "^(lo|any)[[:blank:]]" /etc/sysconfig/static-routes6 | while read device args; do
 362                 /sbin/ip -6 route add $args dev lo
 363         done
 364 }
 365
 366 set_down_loopback()
 367 {
 368         LC_ALL=C ip addr flush dev lo 2>&1 | grep -v "Nothing to flush"
 369         ip link set dev lo down
 370 }
 371
 372 modprobe_net()
 373 {
 374         if is_yes "$IPV6_NETWORKING" && is_module "ipv6"; then
 375                 _modprobe single ipv6
 376         fi
 377
 378         if is_yes "$IPX" && is_module "ipx"; then
 379                 _modprobe single ipx
 380         fi
 381 }
 382
 383 # calculate network prefix from given network mask
 384 calcprefix()
 385 {
 386         local old_IFS netmask prefix endp
 387
 388         old_IFS=$IFS
 389         IFS='.'
 390         netmask=$(echo $1)
 391         IFS=$old_IFS
 392
 393         prefix=0
 394         endp=0
 395         for n in $netmask; do
 396                 for i in 128 64 32 16 8 4 2 1; do
 397                         if [ $(($n & $i)) -ne 0 ]; then
 398                                 if [ $endp -eq 0 ]; then
 399                                         prefix=$(($prefix + 1))
 400                                 else
 401                                         echo "32"
 402                                         return
 403                                 fi
 404                         else
 405                                 endp=1
 406                         fi
 407                 done
 408         done
 409         echo $prefix
 410 }
 411
 412 # calculate network mask from given prefix
 413 # (c) 1999 Grzegorz Stanislawski <stangrze@open.net.pl>
 414 calcnetmask()
 415 {
 416         local prefix a MASK
 417
 418         MASK=""
 419         if [ "${1##[0-9]*}" ]; then
 420                 prefix=32
 421         else
 422                 prefix=$1
 423         fi
 424         for i in 1 2 3 4; do
 425                 case $prefix in
 426                   7)    a=254;;
 427                   6)    a=252;;
 428                   5)    a=248;;
 429                   4)    a=240;;
 430                   3)    a=224;;
 431                   2)    a=192;;
 432                   1)    a=128;;
 433                   *)
 434                         [ $prefix -ge 8 ] && a=255
 435                         [ $prefix -le 0 ] && a=0
 436                         ;;
 437                 esac
 438
 439                 prefix="$(( $prefix - 8))"
 440                 if [ -z "$MASK" ]; then
 441                         MASK=$a
 442                 else
 443                         MASK=$MASK.$a
 444                 fi
 445         done
 446
 447         echo $MASK
 448         return
 449 }
 450
 451 # Retrievies PPPD PID and real interface name from /var/run/ppp-*.pid
 452 get_ppp_device_and_pid ()
 453 {
 454         if [ -f "/var/run/ppp-$DEVNAME.pid" ]; then
 455                 eval $(
 456                 {
 457                         read PID; echo "PID='$PID'"
 458                         read REALDEVICE; echo "REALDEVICE=$REALDEVICE"
 459                 } < "/var/run/ppp-$DEVNAME.pid")
 460         fi
 461
 462         if [ -z "$REALDEVICE" ]; then
 463                 REALDEVICE=$DEVICE
 464         fi
 465 }
 466
 467 # following function setups advanced routing rules
 468 # Olgierd Pieczul <wojrus@pld-linux.org>
 469 setup_ip_rules ()
 470 {
 471         local args prio from src i prio
 472
 473         if [ -f /etc/sysconfig/static-routes ]; then
 474                 if is_yes "$1"; then
 475                         i=10000
 476                         grep -E "^(from|to|iif|tos|fwmark|dev|pref|priority|prio)[[:blank:]]" /etc/sysconfig/static-routes | while read args; do
 477                                 prio=""
 478                                 if [ "${args##* prio }" = "$args" ]; then
 479                                         # no "prio" used in rule, use own prio
 480                                         prio="prio $i"
 481                                         i=$((i + 5))
 482                                 fi
 483                                 /sbin/ip rule add $args $prio
 484                         done
 485                 elif is_no "$1"; then
 486                         LC_ALL=C /sbin/ip rule show | grep -vE -e "from all lookup (main|default|local|253|254|255) \$" -e " map-to " | while read prio from src args; do
 487                                 [ "$src" = "all" ] && /sbin/ip rule delete $args || /sbin/ip rule delete $from $src $args
 488                         done
 489                 fi
 490         fi
 491         is_no "$IPV6_NETWORKING" && return
 492         if [ -f /etc/sysconfig/static-routes6 ]; then
 493                 if is_yes "$1"; then
 494                         i=10000
 495                         grep -E "^(from|to|iif|tos|fwmark|dev|pref|priority|prio)[[:blank:]]" /etc/sysconfig/static-routes6 | while read args; do
 496                                 prio=""
 497                                 if [ "${args##* prio }" = "$args" ]; then
 498                                         # no "prio" used in rule, use own prio
 499                                         prio="prio $i"
 500                                         i=$((i + 5))
 501                                 fi
 502                                 /sbin/ip -6 rule add $args $prio
 503                         done
 504                 elif is_no "$1"; then
 505                         LC_ALL=C /sbin/ip -6 rule show | grep -vE -e "from all lookup (main|default|local|253|254|255) \$" -e " map-to " | while read prio from src args; do
 506                                 [ "$src" = "all" ] && /sbin/ip -6 rule delete $args || /sbin/ip -6 rule delete $from $src $args
 507                         done
 508                 fi
 509         fi
 510 }
 511
 512 is_wireless_device ()
 513 {
 514         if [ -x /sbin/iwconfig ]; then
 515                 LC_ALL=C iwconfig "${1}" 2>&1 | grep -Fq "no wireless extensions" || return 0
 516         fi
 517         return 1
 518 }
 519
 520 wireless_param()
 521 {
 522         device="$1"
 523         if [ "$2" = "br" ]; then
 524                 prefix="${device}_"
 525         else
 526                 prefix=""
 527         fi
 528
 529         local val wlan_mode
 530
 531         # wlan mode needs to be first
 532         wlan_mode="$(eval echo \$${prefix}WLAN_MODE)" && [ "$wlan_mode" ] && \
 533                 iwconfig ${device} mode "$wlan_mode"
 534
 535         val="$(eval echo \$${prefix}WLAN_NICKNAME)" && [ "$val" ] && \
 536                 iwconfig ${device} nick "$val"
 537
 538         val="$(eval echo \$${prefix}WLAN_NWID)" && [ "$val" ] && \
 539                 iwconfig ${device} nwid "$val"
 540
 541         if [ "$wlan_mode" != "Managed" -a "$wlan_mode" != "managed" ]; then
 542                 if val="$(eval echo \$${prefix}WLAN_FREQ)" && [ "$val" ]; then
 543                         iwconfig ${device} freq "$val"
 544                 elif val="$(eval echo \$${prefix}WLAN_CHANNEL)" && [ "$val" ]; then
 545                         iwconfig ${device} channel "$val"
 546                 fi
 547         fi
 548
 549         val="$(eval echo \$${prefix}WLAN_SENS)" && [ "$val" ] && \
 550                 iwconfig ${device} sens "$val"
 551         val="$(eval echo \$${prefix}WLAN_AP)" && [ "$val" ] && \
 552                 iwconfig ${device} ap "$val"
 553         val="$(eval echo \$${prefix}WLAN_BITRATE)" && [ "$val" ] && \
 554                 iwconfig ${device} rate "$val"
 555         val="$(eval echo \$${prefix}WLAN_RTS_THRESHOLD)" && [ "$val" ] && \
 556                 iwconfig ${device} rts "$val"
 557         val="$(eval echo \$${prefix}WLAN_FRAGMENTATION_THRESHOLD)" && [ "$val" ] && \
 558                 iwconfig ${device} frag "$val"
 559
 560         local wlan_encryption="$(eval echo \$${prefix}WLAN_ENCRYPTION)"
 561         local wlan_key="$(eval echo \$${prefix}WLAN_KEY)"
 562         # TODO: well, actually shouldn't set WLAN_KEY if other keys than current are set
 563         if [ "$wlan_key" ]; then
 564                 # wlan key can contain index of key to set
 565                 # to set other than current keys suffix with 1-4:
 566                 local idx
 567                 for idx in 1 2 3 4; do
 568                         val="$(eval echo \$${prefix}WLAN_KEY_$idx)"
 569                         [ "$val" ] || continue
 570                         iwconfig ${device} key "[$idx]" "$val"
 571                 done
 572                 if val="$(eval echo \$${prefix}WLAN_KEY_CURRENT)" && [ "$val" ]; then
 573                         iwconfig ${device} key "[$val]"
 574                 else
 575                         iwconfig ${device} key "$wlan_key"
 576                 fi
 577
 578                 [ "$wlan_encryption" ] && iwconfig ${device} key "$wlan_encryption"
 579         fi
 580
 581         if is_no "$wlan_encryption"; then
 582                 iwconfig ${device} key off
 583         fi
 584         val="$(eval echo \$${prefix}WLAN_POWER)" && [ "$val" ] && \
 585                 iwconfig ${device} power "$val"
 586         val="$(eval echo \$${prefix}WLAN_TXPOWER)" && [ "$val" ] && \
 587                 iwconfig ${device} txpower "$val"
 588         val="$(eval echo \$${prefix}WLAN_RETRY)" && [ "$val" ] && \
 589                 iwconfig ${device} retry "$val"
 590
 591         # essid should be last due to network rescanning by wlan devices
 592         val="$(eval echo \$${prefix}WLAN_ESSID)" && [ "$val" ] && \
 593                 iwconfig ${device} essid "$val"
 594
 595         if is_yes "$(eval echo \$${prefix}WLAN_COMMIT)"; then
 596                 iwconfig ${device} commit
 597         fi
 598 }
 599
 600 # returns
 601 # 0 - no link
 602 # 1 - link ok
 603 # 2 - unsupported, unknown return
 604 check_mii_tool ()
 605 {
 606         [ -x /sbin/mii-tool ] || return 2
 607         local output=$(LC_ALL=C mii-tool $1 2>&1)
 608         echo $output | grep -Fq "link ok" && return 1
 609         echo $output | grep -Fq "no link" && return 0
 610         return 2
 611 }
 612
 613 # returns
 614 # 0 - link off
 615 # 1 - link on
 616 # 2 - unsupported, unknown return
 617 check_ethtool ()
 618 {
 619         [ -x /sbin/ethtool ] || return 2
 620         local output=$(LC_ALL=C ethtool $1 2>&1)
 621         echo $output | grep -Fq "Link detected: yes" && return 1
 622         echo $output | grep -Fq "Link detected: no" && return 0
 623         return 2
 624 }
 625
 626 # returns
 627 # 0 - radio off
 628 # 1 - radio on
 629 # 2 - unsupported
 630 check_iwconfig ()
 631 {
 632         local output
 633         # rfkill state (are there devices with multiple rfkill buttons?)
 634         output=$(cat /sys/class/net/${1}/device/rfkill*/state 2> /dev/null)
 635         # 1 is rfkill not active
 636         [ "$output" = "1" ] && return 1
 637         [ "$output" = "0" -o "$output" = "2" ] && return 0
 638         [ -x /sbin/iwconfig ] || return 2
 639         output=$(LC_ALL=C iwconfig "$1" 2>&1)
 640         # "radio off" is ipwxxx only "feature" (and there is no "radio on")
 641         echo "$output" | grep -Fq "radio off" && return 0
 642         # XXX: need more generic checks for wifi
 643         return 2
 644 }
 645
 646 # returns
 647 # 0 - link down
 648 # 1 - link up
 649 # 2 - unknown/unsupported
 650 check_link_down ()
 651 {
 652         local e i m timeout device max_timeout
 653         device="$1"
 654         max_timeout="$2"
 655
 656         if [ ! -x /sbin/mii-tool -a ! -x /sbin/ethtool -a ! -x /sbin/iwconfig ]; then
 657                 return 2
 658         fi
 659
 660         [ -z "$max_timeout" ] && max_timeout=10
 661
 662         if ! LC_ALL=C ip link show dev $device 2>/dev/null | grep -Fq UP; then
 663                 ip link set dev $device up >/dev/null 2>&1
 664         fi
 665         timeout=0
 666         while [ $timeout -le $max_timeout ]; do
 667                 check_ethtool $device
 668                 e=$?
 669                 check_iwconfig $device
 670                 i=$?
 671                 # trust ethtool and iwconfig
 672                 if [ $i -eq 1 ] || [ $e -eq 1 ]; then
 673                         return 1
 674                 fi
 675                 # use mii check only if all other check are unsupported
 676                 # (mii check lies too often)
 677                 check_mii_tool $device
 678                 m=$?
 679                 if [ $m -eq 1 ] && [ $i -eq 2 ] && [ $e -eq 2 ]; then
 680                         return 1
 681                 fi
 682                 usleep 500000
 683                 timeout=$((timeout+1))
 684         done
 685         # do not abort dhclient if all the checks are unsupported
 686         if [ $m -eq 2 ] && [ $i -eq 2 ] && [ $e -eq 2 ]; then
 687                 return 2
 688         fi
 689         return 0
 690 }