Hi,
For IP address validation, 'm using network address and service translation API
getaddrinfo(). It is used to validate the configured machine is IPV4 or IPV6 by
checking retrieved struct addrinfo member ai_family contents.
----------------------------------------------------------------------------------------------
For example:
IPV4 Address => A.B.C.D
IPV6 Address => Aa:Bb:Cc:Dd:Ee
<snip>
struct addrinfo AddrHints, *res;
memset(&AddrHints, 0, sizeof(AddrHints));
AddrHints.ai_flags = AI_NUMERICHOST;
service =NULL;
Node = (IPV4 or IPV6 address)
getaddrinfo(Node, NULL , &AddrHints, &res);
if(res->ai_family == AF_INET6) { ... }
if(res->ai_family == AF_INET) { ... }
</snip>
----------------------------------------------------------------------------------------------
CASE 1: FULL IPV4 or IPV6 address as node parameter
If we provide Full IPV4 or IPV6 address as mentioned above with the retrieved
struct addrinfo member ai_family contents the proper information.
FULL ip address E.g. [node = "A.B.C.D" or "Aa:Bb:Cc:Dd:Ee"]
CASE 2 :Partial IPV4
When a partial IPV4 address is provided in node parameter of getaddrinfo(), it
returns correctly ai_family as INET (means its a IPV4)
Partial IPV4 ip address [node = "A.B.C"]
CASE 3: Partial IPV6
When a partial IPV6 address is provided in node parameter of getaddrinfo(), it
returns the res contents with INET6 as the ai_family.
Partial IPV6 ip address [node = "Aa:Bb:Cc"]
This seems to contradict with the information provided in Solaris man pages.
As per man pages reference :http://www.manpages.info/sunos/inet.7.html
<snip>
IPv6 Addresses
There are three conventional forms for representing IPv6 addresses as
strings:
1. The preferred form is x:x:x:x:x:x:x:x, where the 'x's are the
hexadecimal values of the eight 16-bit pieces of the address, for example,
1080:0:0:0:8:800:200C:417A
Note that it is not necessary to write the leading zeros in an
individual field. However, there must be at least one numeral in every field
</snip>
In the last line it clearly specifies that if the IPv6 address is written in
x:x:x:x:x:x:x:x format it should be complete and not partial.
But this is not the behavior observed in case of getaddrinfo() with partial
IPV6 address. On the other hand Linux gives expected output when partial IPv6
address is given i.e it returns error code.
Linux => 2.6.18-92.1.10.el5.xs5.0.0.39xen #1 SMP Thu Oct 2 07:35:45 EDT 2008
x86_64 x86_64 x86_64 GNU/Linux
Solaris => SunOS 5.10 Generic_142909-17 sun4u sparc SUNW,Sun-Fire-V440
Can some one look into this ?
Please comment ...
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