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:davi...@xmailserver.org]
>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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