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#compdef pfctl

local pfctl_flush_modifiers pfctl_optimizer_level pfctl_show_modifiers pfctl_tables_command pfctl_debug_level
local -a args

pfctl_flush_modifiers=(
  'rules:flush the filter rules'
  'states:flush the stable table'
  'Sources:flush the source tracking table'
  'info:flush the filter information'
  'Tables:flush the tables'
  'osfp:flush the passive operating system fingerprints'
  'all:flush all'
)

pfctl_show_modifiers=(
    'queue:show the currently loaded queue rules'
    'rules:show the currently loaded filter rules'
    'Anchors:show the currently loaded anchors directly attached to the main ruleset'
    'states:show the contents of the state table'
    'Sources:show the contents of the source tracking table'
    'info:show filter information'
    'labels:show per-rule statistics of filter rules with labels'
    'timeouts:show the current global timeouts'
    'memory:show the current pool memory hard limits'
    'Tables:show the list of tables'
    'osfp:show the list of operating system fingerprints'
    'Interfaces:show the list of interfaces and interface drivers available to PF'
    'all:show all except for the lists of interfaces and operating system fingerprints'
)

pfctl_optimizer_level=(
    'none:disable the ruleset optimizer'
    'basic:enable basic ruleset optimizations'
    'profile:enable basic ruleset optimizations with profiling'
)

pfctl_tables_command=(
    'kill:kill a table'
    'flush:flush all addresses of a table'
    'add:add one or more addresses in a table'
    'delete:delete one or more addresses from a table'
    'expire:delete addresses which had their statistics cleared more than number seconds ago'
    'replace:replace the addresses of the table'
    'show:show the content (addresses) of a table'
    'test:test if the given addresses match a table'
    'zero:clear all the statistics of a table'
    'load:load only the table definitions from pf.conf(5)'
)

_pf_ifaces() {
  compadd "$@" - $(_call_program tables pfctl -s Interfaces)
}

_pf_tables() {
  compadd "$@" - $(_call_program tables pfctl -s Tables)
}

case $OSTYPE in
  openbsd*)
    pfctl_debug_level=(
      emerg alert crit err warning notice info debug
    )
    args=(
      '-L+[load pf states from specified state file]:file:_files'
      "-N[don't perform domain name resolution]"
      '-P[display ports using service names]'
      '-S+[store pf state table in the specified file]:file:_files'
      '-V+[select routing domain to be used to kill states]:routing domain'
    )
  ;;
  (free|net)bsd*)
    pfctl_debug_level=(
      "none:don\'t generate debug messages"
      'urgent:generate debug messages only for serious errors'
      'misc:generate debug messages for various errors'
      'loud:generate debug messages for common conditions'
    )
    pfctl_flush_modifiers+=(
      'nat:flush the NAT rules'
      'queue:flush the queue rules'
    )
    pfctl_show_modifiers+=(
      'nat:show the currently loaded NAT rules'
    )
    args=(
      '-A[load only the queue rules present in the rule file]'
      '-N[load only the NAT rules present in the rule file]'
      '-O[load only the options present in the rule file]'
      '-R[load only the filter rules present in the rule file]'
    )
  ;|
  freebsd*)
    args+=( '-P[display ports numerically]' )
  ;;
esac

_arguments -s $args \
  '-a[apply flags -f, -F, and -s only to the rules in the specified anchor]:anchor' \
  '-F+[flush the filter parameters specified by modifier]:modifier:(($pfctl_flush_modifiers))' \
  '-D+[define macro to be set to value]:macro' \
  '(-e)-d[disable the packet filter]' \
  '(-D)-e[enable the packet filter]' \
  '-f+[load the rules contained in a file]:configuration file:_files' \
  '-g[include output helpful for debugging]' \
  '(-)-h[display help information]' \
  '-i[restrict the operation to the given interface]:interface:_pf_ifaces' \
  '*-K[kill all of the source tracking entries originating from the specified host or network]:host or network:_hosts' \
  '*-k[kill all of the state entries originating from the specified host or network]:host or network:_hosts' \
  '-m[merge in explicitly given options without disturbing others]' \
  "-n[don't actually load rules, just parse them]" \
  '-o+[control the ruleset optimizer]:level:(($pfctl_optimizer_level))' \
  '-p+[use the device file device instead of the default /dev/pf]:device:_files' \
  '-q[only print errors and warnings]' \
  '-r[perform reverse DNS lookups on states when displaying them]' \
  '-s+[show the filter parameters specified by modifier]:modifier:(($pfctl_show_modifiers))' \
  '-T+[specify the command to apply to the table]:command:(($pfctl_tables_command))' \
  '-t[specify the name of the table]:table:_pf_tables' \
  '-v[produce more verbose output]' \
  '-x+[set the debug level]:debug level:(($pfctl_debug_level))' \
  '-z[clear per-rule statistics]'