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Quick DNS overview for one or multiple domains. Requires bash, GNU awk, coreutils, dig.
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| #!/usr/bin/env bash | |
| ip_to_hostname () | |
| { | |
| if [ -z "$1" ] | |
| then | |
| printf '%s\n' "unknown" | |
| else | |
| nc -w 1 "$1" 587 < /dev/null | head -n 1 | awk '{if ($0 == "") {print "none"} else if ($1 == "220" && $0 ~ "SMTP ") {print $2} else {print "unknown"}}' | |
| fi | |
| } | |
| root_domain () | |
| { | |
| printf '%s\n' "${1#www.}" | |
| } | |
| dns_lookup () | |
| { | |
| dig +short -t "$2" "$1" | sort -n | |
| } | |
| ptr_lookup () | |
| { | |
| dig +short -x "$1" | xargs | sed 's/ /+/g' | |
| } | |
| for domain in "$@" | |
| do | |
| printf '%s\n' "$domain" | |
| { | |
| recordtype="CNAME" | |
| while read -r line | |
| do | |
| printf '%s | |%s\n' "$recordtype" "$line" | |
| domain="$line" | |
| done < <(dns_lookup "$domain" "CNAME") | |
| recordtype="NS" | |
| while read -r line | |
| do | |
| printf '%s | |%s\n' "$recordtype" "$line" | |
| unset recordtype | |
| done < <(dns_lookup "$domain" "NS") | |
| if [ -n "$recordtype" ] | |
| then | |
| printf '%s | |%s\n' "$recordtype" "[none]" | |
| fi | |
| recordtype="A" | |
| while read -r line | |
| do | |
| printf '%s | | |%s|ptr: %s|helo587: %s\n' "$recordtype" "$line" "$(ptr_lookup "$line")" "$(ip_to_hostname "$line")" | |
| unset recordtype | |
| done < <(dns_lookup "$domain" "A") | |
| if [ -n "$recordtype" ] | |
| then | |
| printf '%s | |%s\n' "$recordtype" "[none]" | |
| fi | |
| recordtype="AAAA" | |
| while read -r line | |
| do | |
| printf '%s | | |%s|ptr: %s|helo587: %s\n' "$recordtype" "$line" "$(ptr_lookup "$line")" "$(ip_to_hostname "$line")" | |
| unset recordtype | |
| done < <(dns_lookup "$domain" "AAAA") | |
| if [ -n "$recordtype" ] | |
| then | |
| printf '%s | |%s\n' "$recordtype" "[none]" | |
| fi | |
| recordtype="MX" | |
| dns_lookup "$domain" "MX" | while read -r line | |
| do | |
| prio="${line%% *}" | |
| mx="${line##* }" | |
| arecs=$(dns_lookup "$mx" "A") | |
| aaaarecs=$(dns_lookup "$mx" "AAAA") | |
| if [ -n "$arecs" -o -n "$aaaarecs" ] | |
| then | |
| for mxip in $arecs | |
| do | |
| printf '%s |%2s |%s |%s|ptr: %s|helo587: %s\n' "$recordtype" "$prio" "$mx" "$mxip" "$(ptr_lookup "$mxip")" "$(ip_to_hostname "$mxip")" | |
| unset recordtype prio mx | |
| done | |
| for mxip in $aaaarecs | |
| do | |
| printf '%s |%2s |%s |%s|ptr: %s|helo587: %s\n' "$recordtype" "$prio" "$mx" "$mxip" "$(ptr_lookup "$mxip")" "$(ip_to_hostname "$mxip")" | |
| unset recordtype prio mx | |
| done | |
| else | |
| printf '%s |%2s |%s |%s\n' "$recordtype" "$prio" "$mx" "no A or AAAA record" | |
| fi | |
| done | |
| if [ -n "$recordtype" ] | |
| then | |
| printf '%s | |%s\n' "$recordtype" "[none]" | |
| fi | |
| } \ | |
| | column -t -s '|' \ | |
| | sed 's/^/ /' | |
| recordtype="TXT" | |
| while read -r line | |
| do | |
| printf ' TXT %s\n' "$line" | |
| unset recordtype | |
| done < <(dns_lookup "$domain" "TXT") | |
| if [ -n "$recordtype" ] | |
| then | |
| printf ' TXT %s\n' "[none]" | |
| fi | |
| printf '\n' | |
| done |
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| % dnsinfo gmail.com example.com wiki.haskell.org | |
| gmail.com | |
| NS ns1.google.com. | |
| ns2.google.com. | |
| ns3.google.com. | |
| ns4.google.com. | |
| A 216.58.205.229 ptr: fra15s24-in-f229.1e100.net.+fra15s24-in-f5.1e100.net. helo587: | |
| AAAA 2a00:1450:4001:824::2005 ptr: fra16s24-in-x05.1e100.net. helo587: | |
| MX 5 gmail-smtp-in.l.google.com. 74.125.133.26 ptr: wo-in-f26.1e100.net. helo587: | |
| 2a00:1450:400c:c07::1a ptr: wo-in-x1a.1e100.net. helo587: | |
| 10 alt1.gmail-smtp-in.l.google.com. 64.233.164.26 ptr: lf-in-f26.1e100.net. helo587: | |
| 2a00:1450:4010:c07::1b ptr: lf-in-x1b.1e100.net. helo587: | |
| 20 alt2.gmail-smtp-in.l.google.com. 74.125.68.27 ptr: sc-in-f27.1e100.net. helo587: | |
| 2404:6800:4003:c02::1b ptr: sc-in-x1b.1e100.net. helo587: | |
| 30 alt3.gmail-smtp-in.l.google.com. 108.177.125.26 ptr: helo587: | |
| 2404:6800:4008:c01::1a ptr: helo587: | |
| 40 alt4.gmail-smtp-in.l.google.com. 74.125.195.26 ptr: wj-in-f26.1e100.net. helo587: | |
| 2607:f8b0:400e:c09::1b ptr: helo587: | |
| MX [none] | |
| TXT "v=spf1 redirect=_spf.google.com" | |
| example.com | |
| NS a.iana-servers.net. | |
| b.iana-servers.net. | |
| A 93.184.216.34 ptr: helo587: | |
| AAAA 2606:2800:220:1:248:1893:25c8:1946 ptr: helo587: | |
| MX [none] | |
| TXT "$Id: example.com 4415 2015-08-24 20:12:23Z davids $" | |
| TXT "v=spf1 -all" | |
| wiki.haskell.org | |
| CNAME dualstack.j.shared.global.fastly.net. | |
| NS [none] | |
| A 151.101.1.175 ptr: helo587: | |
| 151.101.129.175 ptr: helo587: | |
| 151.101.193.175 ptr: helo587: | |
| 151.101.65.175 ptr: helo587: | |
| AAAA 2a04:4e42:200::431 ptr: helo587: | |
| 2a04:4e42:400::431 ptr: helo587: | |
| 2a04:4e42::431 ptr: helo587: | |
| 2a04:4e42:600::431 ptr: helo587: | |
| MX [none] | |
| TXT dualstack.j.shared.global.fastly.net. |
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