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Re: gethostbyname() triggering duplicate DNS A queries when CNAMEresponse is received

From: Ángel González <keisial at gmail dot com>
To: Jeroen van Bemmel <jvb127 at gmail dot com>
Cc: Siddhesh Poyarekar <siddhesh dot poyarekar at gmail dot com>, libc-help at sourceware dot org
Date: Fri, 29 Jun 2012 12:56:40 +0200
Subject: Re: gethostbyname() triggering duplicate DNS A queries when CNAMEresponse is received
References: <CAOpSVYoDBg38XxCLvksLQOxC-1p3B+FUdnongpX4f9jj18eq3Q@mail.gmail.com> <20120628171159.795081d35aa29aabbe3fd22c@gmail.com> <CAAHN_R2guK2xxaNA6=eoif=xnPvfzyWqhmNgYXCHK7ppjLeZpA@mail.gmail.com> <20120628235740.a03f3753b7583257cb4fd7b6@gmail.com>

Same behavior here with glibc 2.15

64 bits, AF_INET, AI_CANONNAME
- 2 A queries for www.gmail.com + 1 PTR

64 bits, AF_UNSPEC, AI_CANONNAME
- 1 A query + 1 AAA query

64 bits, AF_INET
- 2 A queries for www.gmail.com

64 bits, AF_UNSPEC   
- 1 A query + 1 AAA query


32 bits, AF_INET, AI_CANONNAME
1 A query + 1 PTR query

32 bits, AF_UNSPEC, AI_CANONNAME
- 1 A query + 1 AAA query

32 bits, AF_INET
- 1 A query for www.gmail.com

32 bits, AF_UNSPEC   
- 1 A query + 1 AAA query

References:
- gethostbyname() triggering duplicate DNS A queries when CNAMEresponse is received
  - From: Jeroen van Bemmel
- Re: gethostbyname() triggering duplicate DNS A queries when CNAMEresponse is received
  - From: Jeroen van Bemmel
- Re: gethostbyname() triggering duplicate DNS A queries when CNAMEresponse is received
  - From: Siddhesh Poyarekar
- Re: gethostbyname() triggering duplicate DNS A queries when CNAMEresponse is received
  - From: Jeroen van Bemmel

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