Handbook:IA64/Networking/Extending/cs

From Gentoo Wiki
Jump to:navigation Jump to:search
This page is a translated version of the page Handbook:IA64/Networking/Extending and the translation is 50% complete.
IA64 Handbook
Instalace
O instalaci
Výběr média
Konfigurace sítě
Příprava disků
Instalace stage3
Instalace základního systému
Konfigurace jádra
Konfigurace systému
Instalace nástrojů
Konfigurace zavaděče
Dokončení
Práce s Gentoo
Úvod do Portage
Přepínače USE
Funkce portage
Systém initskriptů
Proměnné prostředí
Práce s Portage
Soubory a adresáře
Proměnné
Mísení softwarových větví
Doplňkové nástroje
Vlastní strom Portage
Pokročilé funkce
Konfigurace sítě
Začínáme
Pokročilá konfigurace
Modulární síťování
Bezdrátové sítě
Přidání funkcí
Dynamická správa

Standard function hooks

Four functions can be defined in /etc/conf.d/net which will be called surrounding the start/stop operations. The functions are called with the interface name first so that one function can control multiple adapters.

The return values for the preup() and predown() functions should be 0 (success) to indicate that configuration or de-configuration of the interface can continue. If preup() returns a non-zero value, then interface configuration will be aborted. If predown() returns a non-zero value, then the interface will not be allowed to continue de-configuration.

The return values for the postup() and postdown() functions are ignored since there's nothing to do if they indicate failure.

${IFACE} is set to the interface being brought up/down. ${IFVAR} is ${IFACE} converted to variable name bash allows.

FILE /etc/conf.d/netpre/post up/down function examples
preup() {
  # Test for link on the interface prior to bringing it up.  This
  # only works on some network adapters and requires the ethtool
  # package to be installed.
  if ethtool ${IFACE} | grep -q 'Link detected: no'; then
    ewarn "No link on ${IFACE}, aborting configuration"
    return 1
  fi
  
  # Remember to return 0 on success
  return 0
}
  
predown() {
  # The default in the script is to test for NFS root and disallow
  # downing interfaces in that case.  Note that if you specify a
  # predown() function you will override that logic.  Here it is, in
  # case you still want it...
  if is_net_fs /; then
    eerror "root filesystem is network mounted -- can't stop ${IFACE}"
    return 1
  fi
  
  # Remember to return 0 on success
  return 0
}
  
postup() {
  # This function could be used, for example, to register with a
  # dynamic DNS service.  Another possibility would be to
  # send/receive mail once the interface is brought up.
       return 0
}
  
postdown() {
  # This function is mostly here for completeness... I haven't
  # thought of anything nifty to do with it yet ;-)
  return 0
}
Poznámka
For more information on writing functions, please read /usr/share/doc/netifrc-*/net.example.bz2.

Wireless tools function hook

Poznámka
This will not work with WPA Supplicant - but the ${ESSID} and ${ESSIDVAR} variables are available in the postup() function.

Two functions can be defined in /etc/conf.d/net which will be called surrounding the associate function. The functions are called with the interface name first so that one function can control multiple adapters.

The return values for the preassociate() function should be 0 (success) to indicate that configuration or de-configuration of the interface can continue. If preassociate() returns a non-zero value, then interface configuration will be aborted.

The return value for the postassociate() function is ignored since there's nothing to do if it indicates failure.

${ESSID} is set to the exact ESSID of the AP the system is connecting to. ${ESSIDVAR} is ${ESSID} converted to a variable name bash allows.

FILE /etc/conf.d/netpre/post association functions
preassociate() {
  # The below adds two configuration variables leap_user_ESSID
  # and leap_pass_ESSID. When they are both configured for the ESSID
  # being connected to then we run the CISCO LEAP script
  
  local user pass
  eval user=\"\$\{leap_user_${ESSIDVAR}\}\"
  eval pass=\"\$\{leap_pass_${ESSIDVAR}\}\"
  
  if [[ -n ${user} && -n ${pass} ]]; then
    if [[ ! -x /opt/cisco/bin/leapscript ]]; then
      eend "For LEAP support, please emerge net-misc/cisco-aironet-client-utils"
      return 1
    fi
    einfo "Waiting for LEAP Authentication on \"${ESSID//\\\\//}\""
    if /opt/cisco/bin/leapscript ${user} ${pass} | grep -q 'Login incorrect'; then
      ewarn "Login Failed for ${user}"
      return 1
    fi
  fi
  
  return 0
}
  
postassociate() {
  # This function is mostly here for completeness... I haven't
  # thought of anything nifty to do with it yet ;-)
  
  return 0
}
Poznámka
${ESSID} and ${ESSIDVAR} are unavailable in predown() and postdown() functions.
Poznámka
For more information on writing custom functions, please read /usr/share/doc/netifrc-*/net.example.bz2.