Re: [PATCH] daemon.c: avoid accessing ss_family member of struct sockaddr_storage

["Gary V. Vaughan" <git@mlists.thewrittenword.com>]

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On Mon, Mar 15, 2010 at 04:42:57PM -0500, Brandon Casey wrote:
> I expect that the layout of the sockaddr_* family of structures will
> follow the layout of struct sockaddr, otherwise they wouldn't be
> compatible.
> 
> In other words, I think that if struct sockaddr looks like this:
> 
>   struct sockaddr {
>         uchar_t         sa_len;         /* total length */
>         sa_family_t     sa_family;      /* address family */
>         char            sa_data[14];    /* actually longer; address value */
>   };
> 
> then somewhere else, struct sockaddr_in looks like this:
> 
>   struct sockaddr_in {
>         uchar_t         sin_len;
>         sin_family_t    sin_family;
>         sin_port;
>         sin_addr;
>         ...
>   };

> On 03/15/2010 04:29 PM, Jeff King wrote:
> > Or am I wrong in assuming that, and on AIX sockaddr_in actually has
> > sa_len at the front, so casting to sockaddr does the right thing (and my
> > recommendation above would actually be broken)? The AIX boxen I have
> > access to are all down at the moment.
> 
> Maybe Gary can check for us... Gary, what does the declaration for
> struct sockaddr_in look like in your AIX header file?

/usr/include/netinet/in.h excerpt:

/*
 * Socket address, internet style.
 */
struct sockaddr_in {
        uchar_t        sin_len;
        sa_family_t    sin_family;
        in_port_t      sin_port;
        struct in_addr sin_addr;
        uchar_t        sin_zero[8];
};

Cheers,
-- 
Gary V. Vaughan (gary@thewrittenword.com)