Created
May 24, 2024 22:11
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| #!/usr/bin/env bash | |
| function newFile() { | |
| _resfile="dns_results.$(date +%s).csv" | |
| echo "hostname,ips" >>"$_resfile" | |
| echo "$_resfile" | |
| } | |
| resfile="$(newFile)" | |
| export resfile | |
| function resolve() { | |
| dig +tries=5 +short "$1" | tr '\n' ' ' | grep -v ';;' | grep . || return 1 | |
| } | |
| function writeResult() { | |
| ( | |
| flock 5 | |
| echo "$@" >>"$resfile" | |
| ) 5>>"$resfile.lock" | |
| } | |
| export resolve | |
| export writeResult | |
| function tryResolve() { | |
| for delay in {1,2,3,4,5,10,15,20,30,45}; do | |
| if resolve "$1"; then | |
| return 0 | |
| else | |
| echo -n "." | |
| sleep "$delay" | |
| fi | |
| done | |
| # fail | |
| return 1 | |
| } | |
| export tryResolve | |
| function try() { | |
| ( | |
| flock -s 6 | |
| if _t="$(tryResolve "$domain")"; then | |
| writeResult "$domain,$_t" | |
| else | |
| echo "$domain" >>"$resfile.failed" | |
| fi | |
| ) 6>>"$resfile.readlock" | |
| } | |
| clear | |
| function log() { | |
| tput home | |
| _fin="$(wc -l "$resfile" 2>/dev/null | awk '{print $1}')" | |
| _failed="$(wc -l "$resfile.failed" 2>/dev/null | awk '{print $1}')" | |
| echo -e "\nfinished: \e[0;32m$_fin\e[0m\nfailed: \e[31m$_failed\e[0m\n" | |
| } | |
| _want=0 | |
| export _want | |
| while read -r domain; do | |
| (("_want = $_want + 1")) | |
| try "$domain" & | |
| log | |
| done | |
| function _total() { | |
| wc -l --total always "$resfile" "$resfile.failed" 2>/dev/null | grep total | tr -d ' total' 2>/dev/null | |
| } | |
| while :; do | |
| sleep 1 | |
| log | |
| if test "$(_total)" -ge "$_want" 2>/dev/null; then | |
| if flock -n "$resfile.readlock"; then | |
| echo -e "\n\nfin." | |
| break | |
| else | |
| echo -n "." | |
| sleep 1 | |
| continue | |
| fi | |
| fi | |
| done |
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