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#compdef dhclient dhclient3

local args

case $OSTYPE in
  (open|free)bsd*)
    args+=(
      '-c+[specify configuration file]:file:_files'
    )
  ;|
  freebsd*)
    args+=(
      '(-d)-b[immediately move to the background]'
      '-l+[specify leases file]:file:_files'
      '-p+[specify PID file]:file:_files'
      '-u[reject leases with unknown options]'
      '-q[quiet]'
    )
  ;;
  openbsd*)
    args+=(
      '-i+[ignore values provided by leases for specified options]:options'
      '-L+[specify file to write option data too]:file:_files'
      "-n[don't configure any interfaces]"
      '-r[release the current lease back to the server it came from]'
      '-v[verbose log messages]'
    )
  ;;
  *) # ISC implementation, used on Linux and NetBSD
    args=(
      '!(-6 -S -T -P -D -N)-4'
      '(-4 -s)-6[use the DHCPv6 protocol]'
      '-1[only try once to get a lease]'
      '(-d)-nw[daemonize immediately rather than wait for IP acquisition]'
      "-m[don't require responding ethernet address of dhcp server to match expectation]"
      '-v[verbose log messages]'
      "-w[don't exit if there are no interfaces found to configure]"
      "-n[don't configure any interfaces]"
      '-e[specify env vars to pass to child processes]:env var key value pairs'
      '-q[quiet]'
      '(-x)-r[release the current lease]'
      '(-r)-x[stop the running DHCP client without releaseing current lease]'
      '-p[specify port to transmit to / listen on]:port:_ports'
      '(-6)-s[transmit to specific target instead of broadcast]:server:_hosts'
      '-g[force giaddr field]:relay:_hosts'
      '-i[use a DUID with DHCPv4 clients]'
      '-I[use the standard DDNS scheme]'
      '(-)--version[display version number]'
      '(-4)-S[use Information-request to get only stateless configuration]'
      '(-4)*-T[ask for IPv6 temporary addresses]'
      '(-4)-P[enable IPv6 prefix delegation]'
      '-D[specify DUID selection method]:DUID:((LL\:link-layer LLT\:link-layer\ plus\ timestamp))'
      '(-4)-N[restore normal address query for IPv6]'
      '-lf[lease file]:lease file:_files'
      '(--no-pid)-pf[pid file]:pid file:_files'
      '(-pf)--no-pid[disable writing pid files]'
      '-cf[config file]:config file:_files'
      '-df[duid file]:duid file:_files'
      '-sf[script file]:script file:_files'
      '-4o6[DHCPv4  over DHCPv6 protocol]:port'
      "-nc[don't drop capabilities]"
      '-B[set the BOOTP  broadcast flag in request packets]'
      '-C[specify dhcp-client-identifier option]:option'
      '(-F)-H[specify host-name option]:host name:_hosts'
      '(-H)-F[specify fully qualified hostname option]:host name:_hosts'
      '-V[specify vendor-class-identifier option]:option'
      '--request-options[specify list of options the client is to request from the server]:options'
      '--timeout[specify time after which dhclient will decide that no DHCP servers can be contacted]:timeout'
      '--dad-wait-time[specify maximum time to wait for duplicate address detection]:time (seconds)'
      '--prefix-len-hint[specify length to request when requesting new prefixes]:length'
      '--decline-wait-time[specify time an IPv4 client should wait between declining an address and issuing a discover]:time (seconds)'
      '--address-prefix-len[specify length of the prefix for IPv6 addresses]:length'
      '(-)'{--help,-h}'[display usage information]'
    )
  ;;
esac

_arguments -s -S -A "-*" $args \
  '(-b -nw)-d[remain as a foreground process]' \
  ':interface:_net_interfaces'