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Refactor DNS resolution logic and validation functions #271

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0a083d5
Refactor DNS resolution logic and validation functions
MiloDev123 Jul 8, 2026
a791cee
Handle non-existent DNS records and improve output
MiloDev123 Jul 8, 2026
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176 changes: 146 additions & 30 deletions :path/dns.osl
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Original file line number Diff line number Diff line change
@@ -1,16 +1,112 @@
def reverse(ip) (
url = "https://apps.mistium.com/cors?url=https://dns.google/query?name=" + ip.replace(":","%3A")
content = url.httpGet().replaceFirst("<!DOCTYPE html>\n<html lang="en"> <head> <title>Query:&nbsp;","").split(" ")[1]
return content
if ip.contains(":") (
url = "https://dns.google/resolve?name=" ++ v6ptr(ip) ++ "&type=PTR"
) else (
url = "https://dns.google/resolve?name=" ++ ip ++ ".in-addr.arpa&type=PTR"
)
content = url.httpGet()["Answer"][1]["data"]
terminal.writeLine(content)
)

def checkipv4(ip) (
def checkipv4octet(data) (
return data <= 255 and data >= 0
def checkipv4(string ip) boolean (
array octets = ip.split(".")
if octets.len != 4 (
return false
)
for i octets.len (
string octet_str = octets[i].toStr()
if octet_str == "" (
return false
)
for j octet_str.len (
if !"0123456789".contains(octet_str[j]) (
return false
)
)
octet = octet_str.toInt()
if octet < 0 or octet > 255 (
return false
)
)
return ip.split(".").every(checkipv4octet)
return true
)

def checkipv6(string ip) boolean (
string tempip = ip.replace("::", ":EMPTY:")
array octets = tempip.split(":")
boolean fail = false
boolean once = false
if ip.contains("::") (
if octets.len > 8 (
fail = true
)
) else (
if octets.len != 8 (
fail = true
)
)
for i octets.len (
octet = octets[i]
if octet == "EMPTY" (
if once == false ( // As per RFC 4291 Section 2.2.2, the '::' can only appear once in an address.
once = true
continue
) else (
fail = true
)
)
if octet == "" (
continue
)
if octet.len > 4 (
fail = true
)
for i octet.len (
if not ("abcdef0123456789".contains(octet[i].toLower())) (
fail = true
)
)
)
if fail == false (
return true
) else (
return false
)
)

def v6ptr(string ip) string (
if ip.startsWith("::") (
ip = "0" ++ ip
)
if ip.endsWith("::") (
ip = ip ++ "0"
)
string tempip = ip.replace("::", ":EMPTY:")
array octets = tempip.split(":")
missing = 9 - octets.len
string full_hex = ""
for i octets.len (
string octet = octets[i].toStr()
if octet == "EMPTY" (
for j missing (
full_hex = full_hex ++ "0000"
)
) else (
while octet.len < 4 (
octet = "0" ++ octet
)
full_hex = full_hex ++ octet
)
)
string ptr = ""
for i full_hex.len (
rev_index = full_hex.len - i + 1
ptr = ptr ++ full_hex[rev_index].toLower() ++ "."
)
ptr = ptr ++ "ip6.arpa."
return ptr
)

if args.len == 0 (
terminal.writeLine("dns: not enough arguments")
)
Expand All @@ -28,41 +124,61 @@ if args[1] == "-h" (
terminal.writeLine(" dns MX example.com → Query mail exchange records")
terminal.writeLine(" dns TXT example.com → Query text records")
terminal.writeLine("")
terminal.writeLine("Supported record types:")
terminal.writeLine(" A, AAAA, MX, TXT, CNAME, NS, PTR, SOA, SRV")
terminal.writeLine("All DNS record types supported.")
return
)


if args.len == 1 (
if args[1].count(":") >= 2 (
url = "https://dns.google/resolve?name=" ++ reverse(args[1]) ++ "&type=PTR"
response = url.httpGet()
for i response.Answer.len (
terminal.writeLine(response.Answer[i].data)
if args[1].contains(":") (
if checkipv6(args[1]) (
reverse(args[1])
) else (
terminal.writeLine("Invalid IPv6")
)
) else if checkipv4(args[1]) (
url = "https://dns.google/resolve?name=" ++ reverse(args[1]) ++ "&type=PTR"
response = url.httpGet()
for i response.Answer.len (
terminal.writeLine(response.Answer[i].data)
) else if args[1].split(".").len == 4 (
if checkipv4(args[1]) (
reverse(args[1])
) else (
terminal.writeLine("Invalid IPv4")
)
) else (
url = "https://dns.google/resolve?name=" ++ args[1] ++ "&type=A"
response = url.httpGet()
for i response.Answer.len (
terminal.writeLine(response.Answer[i].data)
responsea = url.httpGet()
for i responsea.Answer.len (
terminal.writeLine(responsea.Answer[i].data)
)
url = "https://dns.google/resolve?name=" ++ args[1] ++ "&type=AAAA"
response = url.httpGet()
for i response.Answer.len (
terminal.writeLine(response.Answer[i].data)
responseaaaa = url.httpGet()
if responsea.Answer.len + responseaaaa.Answer.len == 0 (
terminal.writeLine("No records found.")
return
) else if responsea.Answer.len == 0 (
terminal.writeLine("No A record found.")
)
for i responseaaaa.Answer.len (
terminal.writeLine(responseaaaa.Answer[i].data)
)
if responseaaaa.Answer.len == 0 (
terminal.writeLine("No AAAA record found.")
)
)
) else (
url = "https://dns.google/resolve?name=" ++ args[2] ++ "&type=" ++ args[1]
response = url.httpGet()
for i response.Answer.len (
terminal.writeLine(response.Answer[i].data)
if args[1].toUpper() in ["A","AAAA","CNAME","MX","TXT","NS","SOA","PTR","SRV","CAA","DNSKEY","DS","TLSA","HTTPS","SVCB","SSHFP","NAPTR","SPF","CERT","DNAME"] (
url = "https://dns.google/resolve?name=" ++ args[2] ++ "&type=" ++ args[1].toUpper()
response = url.httpGet()
if response.Answer == null (
terminal.writeLine("The record does not exist.")
break
)
for i response.Answer.len (
if args[1].toUpper() == "TXT" (
terminal.writeLine('"' ++ response.Answer[i].data ++ '"')
) else (
terminal.writeLine(response.Answer[i].data)
)
)
) else (
terminal.writeLine("Invalid RR Type")
)
)
)
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