ERDNS weirdness

[Bill Healy]

Hi,

I'm having problems receiving mail a particular server. It's being
logged as an ERDNS issue, but when I lookup the IP using the same DNS
server xMail uses I get an answer, although not a configuration I've
seen before, but maybe it's legal, I don't know all the RFCs. So I don't
know if the problem is the way they have setup their RDNS or something
else.

As I understand from what I can find in the docs smtp-rdnscheck just
looks for the IP address having a record. Or is it looking for a PTR
record on the first lookup with out recursion? Or is there something
else it's doing?

This is xMail 1.25 on Windows. Can anyone make sense of why the ERDNS is
coming up?

Here's an excerpt from the smtp log and what I get when I dig the IP
address.


"mx.xxxxxxxxx.com" "mx.xxxxxxxxxx.com" "207.162.214.242" "2009-08-12
15:20:21" "mx.soldoutdisciples.com" "" "kip@..." "" "" "SNDRIP=ERD
NS" "" "0" ""


dig -x 207.162.214.242

; <<>> DiG 9.3.2 <<>> -x 207.162.214.242
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 3, ADDITIONAL: 3

;; QUESTION SECTION:
;242.214.162.207.in-addr.arpa.  IN      PTR

;; ANSWER SECTION:
242.214.162.207.in-addr.arpa. 2971 IN   CNAME
242.224/27.214.162.207.in-addr.arpa.
242.224/27.214.162.207.in-addr.arpa. 37771 IN PTR
enoch.soldoutdisciples.com.
242.224/27.214.162.207.in-addr.arpa. 37771 IN PTR
mx.soldoutdisciples.com.

;; AUTHORITY SECTION:
224/27.214.162.207.in-addr.arpa. 37771 IN NS    ns1.lightonthenet.org.
224/27.214.162.207.in-addr.arpa. 37771 IN NS    ns3.lightonthenet.org.
224/27.214.162.207.in-addr.arpa. 37771 IN NS    ns2.lightonthenet.org.

;; ADDITIONAL SECTION:
ns2.lightonthenet.org.  569866  IN      A       207.162.214.229
ns3.lightonthenet.org.  604118  IN      A       207.162.214.233
ns1.lightonthenet.org.  604118  IN      A       207.162.214.232

;; Query time: 62 msec
;; SERVER: 192.168.1.249#53(192.168.1.249)
;; WHEN: Thu Sep 03 10:59:48 2009
;; MSG SIZE  rcvd: 247


Thanks,
 Bill

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[Davide Libenzi]

On Thu, 3 Sep 2009, Bill Healy wrote:

> Hi,
>
> I'm having problems receiving mail a particular server. It's being
> logged as an ERDNS issue, but when I lookup the IP using the same DNS
> server xMail uses I get an answer, although not a configuration I've
> seen before, but maybe it's legal, I don't know all the RFCs. So I don't
> know if the problem is the way they have setup their RDNS or something
> else.
>
> As I understand from what I can find in the docs smtp-rdnscheck just
> looks for the IP address having a record. Or is it looking for a PTR
> record on the first lookup with out recursion? Or is there something
> else it's doing?
>
> This is xMail 1.25 on Windows. Can anyone make sense of why the ERDNS is
> coming up?

XMail does simply a SysGetHostByAddr() when doing an RDNS check, and this
translates to a call to getnameinfo(), on both Windows and Unix.
It works fine on Linux (using the test program below), and it should even
on Windows:

$ gcc -o nettest nettest.c
$ ./nettest 207.162.214.242
name = 'mx.soldoutdisciples.com'



- Davide



#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

int main(int ac, char **av)
{
        int error;
        struct sockaddr_in addr;
        char name[256];

        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        if (inet_aton(av[1], (struct in_addr *) &addr.sin_addr) == 0) {
                perror(av[1]);
                return 1;
        }
        if ((error = getnameinfo((struct sockaddr *) &addr, sizeof(addr),
                                 name, sizeof(name), NULL, 0, NI_NAMEREQD)) != 0) {
                fprintf(stderr, "%s: %s\n", av[1], gai_strerror(error));
                return 1;
        }
        printf("name = '%s'\n", name);

        return 0;
}

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[Bill Healy]

HI Davide,

So am I correct that all the RDNS check does is look for a hostname and
that's all? Or does it compare it to something once it gets it?

Davide can you, or anyone else on this list e-mail an exe of the test
program so I can see if it works on the Windows 2000 server that xmail
is on?

Thanks,
 Bill

>----------
>From: Davide Libenzi[SMTP:davidel@...]
>Sent: Thursday, September 03, 2009 3:00 PM
>To: XMail Users Mailing List
>Subject: Re: [xmail] ERDNS weirdness
>
>On Thu, 3 Sep 2009, Bill Healy wrote:
>
>> Hi,
>>
>> I'm having problems receiving mail a particular server. It's being
>> logged as an ERDNS issue, but when I lookup the IP using the same DNS
>> server xMail uses I get an answer, although not a configuration I've
>> seen before, but maybe it's legal, I don't know all the RFCs. So I don't
>> know if the problem is the way they have setup their RDNS or something
>> else.
>>
>> As I understand from what I can find in the docs smtp-rdnscheck just
>> looks for the IP address having a record. Or is it looking for a PTR
>> record on the first lookup with out recursion? Or is there something
>> else it's doing?
>>
>> This is xMail 1.25 on Windows. Can anyone make sense of why the ERDNS is
>> coming up?
>
>XMail does simply a SysGetHostByAddr() when doing an RDNS check, and this
>translates to a call to getnameinfo(), on both Windows and Unix.
>It works fine on Linux (using the test program below), and it should even
>on Windows:
>
>$ gcc -o nettest nettest.c
>$ ./nettest 207.162.214.242
>name = 'mx.soldoutdisciples.com'
>
>
>
>- Davide
>
>
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <sys/socket.h>
>#include <netinet/in.h>
>#include <arpa/inet.h>
>#include <netdb.h>
>
>int main(int ac, char **av)
>{
> int error;
> struct sockaddr_in addr;
> char name[256];
>
> memset(&addr, 0, sizeof(addr));
> addr.sin_family = AF_INET;
> if (inet_aton(av[1], (struct in_addr *) &addr.sin_addr) == 0) {
> perror(av[1]);
> return 1;
> }
>        if ((error = getnameinfo((struct sockaddr *) &addr, sizeof(addr),
> name, sizeof(name), NULL, 0, NI_NAMEREQD)) != 0) {
> fprintf(stderr, "%s: %s\n", av[1], gai_strerror(error));
> return 1;
>        }
> printf("name = '%s'\n", name);
>
> return 0;
>}
>
>_______________________________________________
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>xmail@...
>http://xmailserver.org/mailman/listinfo/xmail
>

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[Davide Libenzi]

On Fri, 4 Sep 2009, Bill Healy wrote:

> HI Davide,
>
> So am I correct that all the RDNS check does is look for a hostname and
> that's all? Or does it compare it to something once it gets it?
>
> Davide can you, or anyone else on this list e-mail an exe of the test
> program so I can see if it works on the Windows 2000 server that xmail
> is on?

Attached (source below).



- Davide


#define _WIN32_WINNT 0x0501

#include <winsock2.h>
#include <ws2tcpip.h>
#include <mswsock.h>
#include <windows.h>
#include <windowsx.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


int main(int ac, char **av)
{
        int error;
        WSADATA wsd;
        struct sockaddr_in addr;
        char name[256];

        if (WSAStartup(MAKEWORD(2, 0), &wsd)) {
                fprintf(stderr, "WSAStartup failed!\n");
                return 1;
        }

        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        addr.sin_addr.S_un.S_addr = inet_addr(av[1]);
        if ((error = getnameinfo((struct sockaddr *) &addr, sizeof(addr),
                                 name, sizeof(name), NULL, 0, NI_NAMEREQD)) != 0) {
                fprintf(stderr, "%s: %s\n", av[1], gai_strerror(error));
                return 1;
        }
        printf("name = '%s'\n", name);

        return 0;
}


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[CLEMENT Francis]

Hi Davide

Tool tested on w2000 sp4 returns this error :

(manually translated from French to English so not exact english error)

"getnameinfo entry point no found in dinamic link library WS2_32.dll"

Works fine on w2003R2 SP2
(not tested on w2003 no sp nor 2008/2008r2)


Francis

>-----Message d'origine-----
>De : xmail-bounces@...
>[mailto:xmail-bounces@...]De la part de Davide Libenzi
>Envoyé : samedi 5 septembre 2009 20:04
>À : XMail Users Mailing List
>Objet : Re: [xmail] ERDNS weirdness
>
>
>On Fri, 4 Sep 2009, Bill Healy wrote:
>
>> HI Davide,
>>
>> So am I correct that all the RDNS check does is look for a
>hostname and
>> that's all? Or does it compare it to something once it gets it?
>>
>> Davide can you, or anyone else on this list e-mail an exe of the test
>> program so I can see if it works on the Windows 2000 server
>that xmail
>> is on?
>
>Attached (source below).
>
>
>
>- Davide
>
>
>#define _WIN32_WINNT 0x0501
>
>#include <winsock2.h>
>#include <ws2tcpip.h>
>#include <mswsock.h>
>#include <windows.h>
>#include <windowsx.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>
>
>int main(int ac, char **av)
>{
>        int error;
> WSADATA wsd;
>        struct sockaddr_in addr;
>        char name[256];
>
> if (WSAStartup(MAKEWORD(2, 0), &wsd)) {
> fprintf(stderr, "WSAStartup failed!\n");
> return 1;
> }
>
>        memset(&addr, 0, sizeof(addr));
>        addr.sin_family = AF_INET;
> addr.sin_addr.S_un.S_addr = inet_addr(av[1]);
>        if ((error = getnameinfo((struct sockaddr *) &addr,
>sizeof(addr),
>                                 name, sizeof(name), NULL, 0,
>NI_NAMEREQD)) != 0) {
>                fprintf(stderr, "%s: %s\n", av[1],
>gai_strerror(error));
>                return 1;
>        }
>        printf("name = '%s'\n", name);
>
>        return 0;
>}
>

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[CLEMENT Francis]

Davide

For informations about getnameinfo on windows older than XP you can check
this :

http://msdn.microsoft.com/en-us/library/ms738532(VS.85).aspx

And end of article you will find "Support for getnameinfo on older versions
of Windows"

Seems you need to include Ws2tcpip.h file (done) AND also include the
Wspiapi.h file :)

(not tested I have no compiler here :( )

Francis

>-----Message d'origine-----
>De : xmail-bounces@...
>[mailto:xmail-bounces@...]De la part de CLEMENT Francis
>Envoyé : lundi 7 septembre 2009 09:52
>À : 'XMail Users Mailing List'
>Objet : Re: [xmail] ERDNS weirdness
>
>
>
>Hi Davide
>
>Tool tested on w2000 sp4 returns this error :
>
>(manually translated from French to English so not exact english error)
>
>"getnameinfo entry point no found in dinamic link library WS2_32.dll"
>
>Works fine on w2003R2 SP2
>(not tested on w2003 no sp nor 2008/2008r2)
>
>
>Francis
>
>
>
>>-----Message d'origine-----
>>De : xmail-bounces@...
>>[mailto:xmail-bounces@...]De la part de Davide Libenzi
>>Envoyé : samedi 5 septembre 2009 20:04
>>À : XMail Users Mailing List
>>Objet : Re: [xmail] ERDNS weirdness
>>
>>
>>On Fri, 4 Sep 2009, Bill Healy wrote:
>>
>>> HI Davide,
>>>
>>> So am I correct that all the RDNS check does is look for a
>>hostname and
>>> that's all? Or does it compare it to something once it gets it?
>>>
>>> Davide can you, or anyone else on this list e-mail an exe
>of the test
>>> program so I can see if it works on the Windows 2000 server
>>that xmail
>>> is on?
>>
>>Attached (source below).
>>
>>
>>
>>- Davide
>>
>>
>>#define _WIN32_WINNT 0x0501
>>
>>#include <winsock2.h>
>>#include <ws2tcpip.h>
>>#include <mswsock.h>
>>#include <windows.h>
>>#include <windowsx.h>
>>#include <stdio.h>
>>#include <stdlib.h>
>>#include <string.h>
>>
>>
>>int main(int ac, char **av)
>>{
>>        int error;
>> WSADATA wsd;
>>        struct sockaddr_in addr;
>>        char name[256];
>>
>> if (WSAStartup(MAKEWORD(2, 0), &wsd)) {
>> fprintf(stderr, "WSAStartup failed!\n");
>> return 1;
>> }
>>
>>        memset(&addr, 0, sizeof(addr));
>>        addr.sin_family = AF_INET;
>> addr.sin_addr.S_un.S_addr = inet_addr(av[1]);
>>        if ((error = getnameinfo((struct sockaddr *) &addr,
>>sizeof(addr),
>>                                 name, sizeof(name), NULL, 0,
>>NI_NAMEREQD)) != 0) {
>>                fprintf(stderr, "%s: %s\n", av[1],
>>gai_strerror(error));
>>                return 1;
>>        }
>>        printf("name = '%s'\n", name);
>>
>>        return 0;
>>}
>>
>_______________________________________________
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>xmail@...
>http://xmailserver.org/mailman/listinfo/xmail
>

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[Davide Libenzi]

On Mon, 7 Sep 2009, CLEMENT Francis wrote:

>
> Hi Davide
>
> Tool tested on w2000 sp4 returns this error :
>
> (manually translated from French to English so not exact english error)
>
> "getnameinfo entry point no found in dinamic link library WS2_32.dll"
>
> Works fine on w2003R2 SP2
> (not tested on w2003 no sp nor 2008/2008r2)

It could be, although this would have revealed in a different way, to the
original poster (XMail would not start at all).


- Davide


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[Davide Libenzi]

On Mon, 7 Sep 2009, CLEMENT Francis wrote:

> Davide
>
> For informations about getnameinfo on windows older than XP you can check
> this :
>
> http://msdn.microsoft.com/en-us/library/ms738532(VS.85).aspx
>
> And end of article you will find "Support for getnameinfo on older versions
> of Windows"
>
> Seems you need to include Ws2tcpip.h file (done) AND also include the
> Wspiapi.h file :)

No that's fine. If the binary runs, it means getnameinfo() is there.
Maybe a temporary local DNS/network problem, or a misconfigured one, might
have caused the problem to the original poster.


- Davide


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[CLEMENT Francis]

>-----Message d'origine-----
>De : xmail-bounces@...
>[mailto:xmail-bounces@...]De la part de Davide Libenzi
>Envoyé : lundi 7 septembre 2009 16:47
>À : XMail Users Mailing List
>Objet : Re: [xmail] ERDNS weirdness
>
>
>On Mon, 7 Sep 2009, CLEMENT Francis wrote:
>
>> Davide
>>
>> For informations about getnameinfo on windows older than XP
>you can check
>> this :
>>
>> http://msdn.microsoft.com/en-us/library/ms738532(VS.85).aspx
>>
>> And end of article you will find "Support for getnameinfo on
>older versions
>> of Windows"
>>
>> Seems you need to include Ws2tcpip.h file (done) AND also include the
>> Wspiapi.h file :)
>
>No that's fine. If the binary runs, it means getnameinfo() is there.
>Maybe a temporary local DNS/network problem, or a
>misconfigured one, might
>have caused the problem to the original poster.
>
>
>- Davide
>
>
>

My post was about nettest tool you provided, not about xmail server itself
:)

When I try to run "nettest" binary on w2000 sp4, Windows returned immediatly
the error mentioned in my previous post !?!?
So the nettest "binary' don't start at all :)
So this tool can't help Bill (original poster) to test it's server responses

Could you provide a nettest binary that can run on w2000 ?

Francis
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[Davide Libenzi]

On Mon, 7 Sep 2009, CLEMENT Francis wrote:

> My post was about nettest tool you provided, not about xmail server itself
> :)
>
> When I try to run "nettest" binary on w2000 sp4, Windows returned immediatly
> the error mentioned in my previous post !?!?
> So the nettest "binary' don't start at all :)
> So this tool can't help Bill (original poster) to test it's server responses
>
> Could you provide a nettest binary that can run on w2000 ?

Windows 2000?! I wasn't even born in year 2000 :)
Seriously, I think there might be something wrong with your Win2K setup,
otherwise XMail (that does not include wspiapi.h) could not run on any
Win2K setup. And I know it does.
Maybe the definition of _WIN32_WINNT screwed that up, but I doubt, since a
missing ws2_32.dll is a more serious problem.
You can try the attached binary, but I doubt it helps, since it still
links to ws2_32.dll.



- Davide



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[CLEMENT Francis]

>-----Message d'origine-----
>De : xmail-bounces@...
>[mailto:xmail-bounces@...]De la part de Davide Libenzi
>Envoyé : lundi 7 septembre 2009 19:55
>À : XMail Users Mailing List
>Objet : Re: [xmail] ERDNS weirdness
>
>
>On Mon, 7 Sep 2009, CLEMENT Francis wrote:
>
>> My post was about nettest tool you provided, not about xmail
>server itself
>> :)
>>
>> When I try to run "nettest" binary on w2000 sp4, Windows
>returned immediatly
>> the error mentioned in my previous post !?!?
>> So the nettest "binary' don't start at all :)
>> So this tool can't help Bill (original poster) to test it's
>server responses
>>
>> Could you provide a nettest binary that can run on w2000 ?
>
>Windows 2000?! I wasn't even born in year 2000 :)

Yes, me too :)
But why change a system that works :)

>Seriously, I think there might be something wrong with your
>Win2K setup,

Don't think so, because xmail works on the same system where I tested first
nettest version

>otherwise XMail (that does not include wspiapi.h) could not run on any
>Win2K setup. And I know it does.

Yes, this confirm win2k setup is ok

>Maybe the definition of _WIN32_WINNT screwed that up, but I
>doubt, since a
>missing ws2_32.dll is a more serious problem.
>You can try the attached binary, but I doubt it helps, since it still
>links to ws2_32.dll.
>
>
>
>- Davide
>
>

This version works on w2k without any problem

And xmail works while using getnameinfo but without including wspiapi.h,
strange !
Perhabs a different compiler or linker option for xmail that force some
others inclusions or lib search ?

Thanks Davide
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[Davide Libenzi]

On Tue, 8 Sep 2009, CLEMENT Francis wrote:

> This version works on w2k without any problem
>
> And xmail works while using getnameinfo but without including wspiapi.h,
> strange !
> Perhabs a different compiler or linker option for xmail that force some
> others inclusions or lib search ?

I think it was the removal of the _WIN32_WINNT definition, more than the
include file, the reason of the behaviour change.


- Davide


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[Edinilson - ATINET]

I´m using W2K SP4 + Xmail here for years, without problems...

The first version of nettest (that was sended in 09/05/2009) didn´t run
here.
The second version (that was sended in 09/07/2009) ran without problems.

Regards

Edinilson
---------------------------------------------------------
ATINET-Professional Web Hosting
Tel Voz: (0xx11) 4412-0876
http://www.atinet.com.br


----- Original Message -----
From: "Davide Libenzi" <davidel@...>
To: "XMail Users Mailing List" <xmail@...>
Sent: Monday, September 07, 2009 2:55 PM
Subject: Re: [xmail] ERDNS weirdness


On Mon, 7 Sep 2009, CLEMENT Francis wrote:

> My post was about nettest tool you provided, not about xmail server itself
> :)
>
> When I try to run "nettest" binary on w2000 sp4, Windows returned
> immediatly
> the error mentioned in my previous post !?!?
> So the nettest "binary' don't start at all :)
> So this tool can't help Bill (original poster) to test it's server
> responses
>
> Could you provide a nettest binary that can run on w2000 ?

Windows 2000?! I wasn't even born in year 2000 :)
Seriously, I think there might be something wrong with your Win2K setup,
otherwise XMail (that does not include wspiapi.h) could not run on any
Win2K setup. And I know it does.
Maybe the definition of _WIN32_WINNT screwed that up, but I doubt, since a
missing ws2_32.dll is a more serious problem.
You can try the attached binary, but I doubt it helps, since it still
links to ws2_32.dll.



- Davide




--------------------------------------------------------------------------------


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