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#compdef ss

local curcontext="$curcontext" suf ret=1
local -a state line expl pref filt
local -A opt_args
local info="-h -V --help --version"
local sx="state exclude"

_arguments -C -s \
  "(- *)"{-h,--help}'[show option summary]' \
  "(- *)"{-V,--version}'[show version information]' \
  "($info -n --numeric)"{-n,--numeric}"[don't resolve service names]" \
  "($info -r --resolve)"{-r,--resolve}'[resolve host addresses]' \
  "($info -a --all -l --listening)"{-a,--all}'[display all sockets]' \
  "($info -l --listening -a --all)"{-l,--listening}'[display listening sockets]' \
  "($info -o --options -e --extended)"{-o,--options}'[show timer information]' \
  "($info -e --extended -o --options)"{-e,--extended}'[show detailed information]' \
  "($info -m --memory)"{-m,--memory}'[show socket memory usage]' \
  "($info -p --processes)"{-p,--processes}'[show process using each socket]' \
  "($info -i --info)"{-i,--info}'[show internal TCP information]' \
  "($info -s --summary)"{-s,--summary}'[print summary statistics]' \
  "($info -b --bpf)"{-b,--bpf}'[show bpf filter socket information]' \
  "($info -E --events)"{-E,--events}'[continually display sockets as they are destroyed]' \
  "($info -Z --context)"{-Z,--context}'[display process SELinux security contexts]' \
  "($info -z --contexts)"{-z,--contexts}'[display process and socket SELinux security contexts]' \
  "($info -N --net)"{-N,--net}'[switch to specified network namespace]:network namespace' \
  "($info -4 --ipv4 -6 --ipv6)"{-4,--ipv4}'[display only IP version 4 sockets]' \
  "($info -4 --ipv4 -6 --ipv6)"{-6,--ipv6}'[display only IP version 6 sockets]' \
  "($info -0 --packet)"{-0,--packet}'[display PACKET sockets]' \
  "($info -t --tcp)"{-t,--tcp}'[display TCP sockets]' \
  "($info -u --udp)"{-u,--udp}'[display UDP sockets]' \
  "($info -d --dccp)"{-d,--dccp}'[display DCCP sockets]' \
  "($info -w --raw)"{-w,--raw}'[display RAW sockets]' \
  "($info -x --unix)"{-x,--unix}'[display Unix domain sockets]' \
  "($info -f --family)"{-f,--family}'[display sockets of specified type]:family:(unix inet inet6 link netlink unix)' \
  "($info -K --kill)"{-K,--kill}'[forcibly close sockets, display what was closed]' \
  "($info -H --no-header)"{-H,--no-header}'[suppress header line]' \
  "($info -A --query --socket)"{-A,--query,--socket}'[specify socket tables to show]: :_values -s , socket\ table all inet tcp udp raw unix packet netlink unix_dgram unix_stream unix_seqpacket packet_raw packet_dgram' \
  "($info -D)"{-D,--diag=}'[dump raw info to file]:file:_files' \
  "($info -F)"{-F,--filter=}'[read filter information from a file]:file:_files' \
  "($info)*: :->filter" && ret=0

if [[ -n $state ]]; then
  case $words[CURRENT-1] in
  (d|s)port)
    _wanted operators expl operator \
      compadd \< \> \= \>= \<= \== \!= eq ge gt lt le ne && ret=0
  ;;
  dst|src)
    if compset -P unix: || (( $+opt_args[-x] + $+opt_args[--unix] )) || [[ $opt_args[-f] = unix ]]; then
      _files -g '*(=)' && ret=0
    elif compset -P nl:; then
      if compset -P \*:; then
        _pids && ret=0
      else
        _message channel
      fi
    elif compset -P link:; then
      compset -P \*: && _message ifindex || _message protocol
    else
      compset -P 'inet(6|):'
      pref=$?
      compset -S ':*' || suf="-qS:"
      if compset -P \*:; then
        _ports && ret=0
      elif compset -P \*/; then
        _wanted netmasks expl netmask compadd $suf {1..31} && ret=0
      elif (( pref )); then
        _alternative \
          "hosts:host:_hosts $suf" \
          "prefixes:prefix:compadd $suf nl link unix" && ret=0
      else
        _hosts $suf && ret=0
      fi
    fi
  ;;
  state|exclude)
    _wanted states expl state compadd -M 'm:{a-zA-Z_}={A-Za-z-}' \
      ESTABLISHED SYN-SENT SYN-RECV FIN-WAIT-1 FIN-WAIT-2 TIME-WAIT \
      CLOSED CLOSE-WAIT LAST-ACK LISTEN CLOSING \
      all connected synchronized bucket big && ret=0
  ;;
  *)
    if [[ $words[CURRENT-2] = (d|s)port ]]; then
      compset -P '*:' || pref=(-P :)
      _ports $pref
      return
    else
      (( $#line > 1 )) && [[ ${words[CURRENT-1]:Q} != (and|or|\() ]] &&
          filt=( "($sx)*"{and,or} )
      _values -w -s ' ' -S ' ' filter $filt \
        "*state[sockets in specified state]" \
        "*exclude[sockets not in specified state]" \
        "($sx)*src[local address/port of socket]" \
        "($sx)*dst[peer address/port of socket]" \
        "($sx)*dport[peer port]: :(lt gt ge)" \
        "($sx)*sport[local port]" \
        "($sx)*autobound[socket bound to ephemeral port]" \
        "($sx)*"{not,\(,\)} && ret=0
    fi
  ;;
  esac
fi

return ret