Guida avanzata di scripting Bash - Portale Posta DMI

}
Appendice A. Script aggiuntivi
# Reverse lookup :: Address -> Name
# short_rev
short_rev() {
local -a _sr_reply
local -i _sr_rc
local -i _sr_cnt
IFS=${NO_WSP}
echo -n ’.’
# echo ’srev: ’${1}
_sr_reply=( $(dig +short -x ${1} 2>/dev/null) )
_sr_rc=$?
if [ ${_sr_rc} -ne 0 ]
then
_trace_log[${#_trace_log[@]}]=’# # # Lookup error ’${_sr_rc}’ on ’${1}’ # # #’
# [ ${_sr_rc} -ne 9 ] && pend_drop
return ${_sr_rc}
else
# Some versions of ’dig’ return warnings on stdout.
_sr_cnt=${#_sr_reply[@]}
for (( _sr = 0 ; _sr < ${_sr_cnt} ; _sr++ ))
do
[ ’x’${_sr_reply[${_sr}]:0:2} == ’x;;’ ] &&
unset _sr_reply[${_sr}]
done
eval $2=\( \$\{_sr_reply\[@\]\} \)
fi
return 0
}
# Special format lookup used to query blacklist servers.
# short_text
short_text() {
local -a _st_reply
local -i _st_rc
local -i _st_cnt
IFS=${NO_WSP}
# echo ’stxt: ’${1}
_st_reply=( $(dig +short ${1} -c in -t txt 2>/dev/null) )
_st_rc=$?
if [ ${_st_rc} -ne 0 ]
then
_trace_log[${#_trace_log[@]}]=’# # # Text lookup error ’${_st_rc}’ on ’${1}’ # # #’
# [ ${_st_rc} -ne 9 ] && pend_drop
return ${_st_rc}
else
# Some versions of ’dig’ return warnings on stdout.
_st_cnt=${#_st_reply[@]}
for (( _st = 0 ; _st < ${#_st_cnt} ; _st++ ))
do
[ ’x’${_st_reply[${_st}]:0:2} == ’x;;’ ] &&
unset _st_reply[${_st}]
686