Hello,
Any chance for this one to get reviewed?
It allows 1 more test to complete successfully in case of
certain (though seems to be valid) DNS server setups.
-Alexey
> -----Original Message-----
> From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
> Sent: Monday, December 17, 2018 9:54 PM
> To: Alexey Brodkin <Alexey.Brodkin@xxxxxxxxxxxx>; libc-alpha@xxxxxxxxxxxxxx
> Cc: linux-snps-arc@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH] posix/tst-getaddrinfo4: Consider EAI_NODATA as an expected result
>
> On 7/30/18 3:40 AM, Alexey Brodkin wrote:
> > Some proxy DNS servers might not resolve IPv6 names to addresses.
> > Instead they reply with NOERROR while passing no real data.
> > That combination of NOERROR and EAI_NODATA happen because the DNS
> > server has a recored for requested name (example.net in our case)
> > but that record is not of AAAA type which was requested.
> >
> > That's what Wireshark sees in that case:
> > ---------------------------------->8-----------------------------
> > Domain Name System (response)
> > Transaction ID: 0x6e2e
> > Flags: 0x8180 Standard query response, No error
> > 1... .... .... .... = Response: Message is a response
> > .000 0... .... .... = Opcode: Standard query (0)
> > .... .0.. .... .... = Authoritative: Server is not an authority for domain
> > .... ..0. .... .... = Truncated: Message is not truncated
> > .... ...1 .... .... = Recursion desired: Do query recursively
> > .... .... 1... .... = Recursion available: Server can do recursive queries
> > .... .... .0.. .... = Z: reserved (0)
> > .... .... ..0. .... = Answer authenticated: Answer/authority portion was not authenticated by
> the server
> > .... .... ...0 .... = Non-authenticated data: Unacceptable
> > .... .... .... 0000 = Reply code: No error (0)
> > Questions: 1
> > Answer RRs: 0
> > Authority RRs: 0
> > Additional RRs: 0
> > Queries
> > example.net: type AAAA, class IN
> > Name: example.net
> > [Name Length: 11]
> > [Label Count: 2]
> > Type: AAAA (IPv6 Address) (28)
> > Class: IN (0x0001)
> > ---------------------------------->8-----------------------------
> >
> > And that's what we see if Google DNS server (8.8.8.8) is used instead:
> > ---------------------------------->8-----------------------------
> > Domain Name System (response)
> > Transaction ID: 0x3cd4
> > Flags: 0x8180 Standard query response, No error
> > 1... .... .... .... = Response: Message is a response
> > .000 0... .... .... = Opcode: Standard query (0)
> > .... .0.. .... .... = Authoritative: Server is not an authority for domain
> > .... ..0. .... .... = Truncated: Message is not truncated
> > .... ...1 .... .... = Recursion desired: Do query recursively
> > .... .... 1... .... = Recursion available: Server can do recursive queries
> > .... .... .0.. .... = Z: reserved (0)
> > .... .... ..0. .... = Answer authenticated: Answer/authority portion was not authenticated by
> the server
> > .... .... ...0 .... = Non-authenticated data: Unacceptable
> > .... .... .... 0000 = Reply code: No error (0)
> > Questions: 1
> > Answer RRs: 1
> > Authority RRs: 0
> > Additional RRs: 0
> > Queries
> > example.net: type AAAA, class IN
> > Name: example.net
> > [Name Length: 11]
> > [Label Count: 2]
> > Type: AAAA (IPv6 Address) (28)
> > Class: IN (0x0001)
> > Answers
> > example.net: type AAAA, class IN, addr 2606:2800:220:1:248:1893:25c8:1946
> > ---------------------------------->8-----------------------------
> > ---
> > posix/tst-getaddrinfo4.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/posix/tst-getaddrinfo4.c b/posix/tst-getaddrinfo4.c
> > index dc9e423448af..0139dee777a1 100644
> > --- a/posix/tst-getaddrinfo4.c
> > +++ b/posix/tst-getaddrinfo4.c
> > @@ -39,6 +39,7 @@ try (const char *service, int family, int flags)
> > case 0:
> > case EAI_AGAIN:
> > case EAI_NONAME:
> > + case EAI_NODATA:
> > printf ("SUCCESS getaddrinfo(service=%s, family=%d, flags=%d): %s: %m\n",
> > service ?: "NULL", family, flags, gai_strerror (res));
> > return 0;
> >
>
> Ping !
_______________________________________________
linux-snps-arc mailing list
linux-snps-arc@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/linux-snps-arc
