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[2007-10-04 13:12 UTC] misc at e2007 dot cynergi dot com
Description:
------------
dns_get_record() doesn't return all text from TXT record.
RFC 1035 states that TXT record values can't have "compression", but can have multiple strings for the same DNS record. Although uncommon, such long TXT strings actualy exist to make publicly available public key data for DomainKeys e-mail protocols (used by Yahoo! and Gmail).
The following code examples where compiled when under Windows, the command "nslookup -type=TXT bravo._domainkey.yahoogroups.co.uk" returned:
(...)
Non-authoritative answer:
bravo._domainkey.yahoogroups.co.uk text =
"k=rsa; p=MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhAKt1OprXeH+okFnh8XxMeVV9iYAbhIOMq3ODHpcBm7JSl3Orusqv53BIn55a0JaP1iqbIWu5j3TVIpqbG7MHZU"
"KJQrqcmVSvG7oT3r7Fwo6aCHMMuL+IZdEpbb9ZU8xomQIDAP//"
Reproduce code:
---------------
$x = dns_get_record("bravo._domainkey.yahoogroups.co.uk", DNS_TXT);
var_dump($x);
Expected result:
----------------
array(1) {
[0]=>
array(5) {
["host"]=>
string(34) "bravo._domainkey.yahoogroups.co.uk"
["type"]=>
string(3) "TXT"
["txt"]=>
string(127) "k=rsa; p=MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhAKt1OprXeH+okFnh8XxMeVV9iYAbhIOMq3ODHpcBm7JSl3Orusqv53BIn55a0JaP1iqbIWu5j3TVIpqbG7MHZUKJQrqcmVSvG7oT3r7Fwo6aCHMMuL+IZdEpbb9ZU8xomQIDAP//"
["class"]=>
string(2) "IN"
["ttl"]=>
int(17428)
}
}
Actual result:
--------------
array(1) {
[0]=>
array(5) {
["host"]=>
string(34) "bravo._domainkey.yahoogroups.co.uk"
["type"]=>
string(3) "TXT"
["txt"]=>
string(127) "k=rsa; p=MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhAKt1OprXeH+okFnh8XxMeVV9iYAbhIOMq3ODHpcBm7JSl3Orusqv53BIn55a0JaP1iqbIWu5j3TVIpqbG7MHZU"
["class"]=>
string(2) "IN"
["ttl"]=>
int(17428)
}
}
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Last updated: Tue Mar 04 06:01:27 2025 UTC |
i reproduce this and create a patch for problem solving. it works for me: $ ./sapi/cli/php -r '$x = dns_get_record("bravo._domainkey.yahoogroups.co.uk", DNS_TXT); var_dump($x);' array(1) { [0]=> array(5) { ["host"]=> string(34) "bravo._domainkey.yahoogroups.co.uk" ["type"]=> string(3) "TXT" ["txt"]=> string(179) "k=rsa; p=MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhAKt1OprXeH+okFnh8XxMeVV9iYAbhIOMq3ODHpcBm7JSl3Orusqv53BIn55a0JaP1iqbIWu5j3TVIpqbG7MHZUKJQrqcmVSvG7oT3r7Fwo6aCHMMuL+IZdEpbb9ZU8xomQIDAP//" ["class"]=> string(2) "IN" ["ttl"]=> int(21130) } } Here is code: $ cat /home/sawoy/dns.c.patch --- ../source/php-5.2.5/ext/standard/dns.c 2007-06-26 04:04:55.000000000 -0700 +++ ./ext/standard/dns.c 2008-03-02 03:56:21.000000000 -0800 @@ -474,12 +474,17 @@ static u_char *php_parserr(u_char *cp, q break; case DNS_T_TXT: add_assoc_string(*subarray, "type", "TXT", 1); - n = cp[0]; - tp = emalloc(n + 1); - memcpy(tp, cp + 1, n); - tp[n] = '\0'; + tp = emalloc(dlen + 1); + int ll = 0; + while ( ll < dlen) + { + n = cp[ll]; + memcpy(tp + ll , cp + ll + 1, n); + ll = ll + n + 1; + } + tp[dlen] = '\0'; cp += dlen; - add_assoc_stringl(*subarray, "txt", tp, n, 0); + add_assoc_stringl(*subarray, "txt", tp, dlen, 0); break; case DNS_T_SOA: add_assoc_string(*subarray, "type", "SOA", 1);