From: Eric Dumazet <eric.dumazet@gmail.com>
To: "Rémi Denis-Courmont" <remi.denis-courmont@nokia.com>
Cc: ext Zsolt SZALAI <zs.szalai@gmail.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: getaddrinfo - too many recvmsg calls
Date: Mon, 20 Jul 2009 09:55:20 +0200 [thread overview]
Message-ID: <4A6422E8.9000001@gmail.com> (raw)
In-Reply-To: <200907201014.18063.remi.denis-courmont@nokia.com>
Rémi Denis-Courmont a écrit :
> On Monday 20 July 2009 10:05:56 ext Zsolt SZALAI wrote:
>> The sanitycheck is now really simple, just a
>> addrinfo hints = { 0, AF_INET, 0, 0, 0, NULL, NULL, NULL };
>> int result = getaddrinfo(ipAddress, NULL, &hints, &addresses);
>> call.
>
> What the heck is this supposed to do?
> This piece of code tries to resolve <ipAddress> as numerical IPv4 address *or*
> a DNS hostname.
>
> If you want to check that a string is a valid IP address, call inet_pton(). If
> you want to check that an IP address is assigned to the system, create a
> socket and bind to that address.
>
Yes, but beware of ip_nonlocal_bind option (/proc/sys/net/ipv4/ip_nonlocal_bind).
If set to one, bind() will not tell you if address is assigned to the system.
prev parent reply other threads:[~2009-07-20 7:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-20 7:05 getaddrinfo - too many recvmsg calls Zsolt SZALAI
2009-07-20 7:14 ` Rémi Denis-Courmont
2009-07-20 7:55 ` Eric Dumazet [this message]
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