On Mar 19, 2020, at 7:40 AM, Gisle Vanem <gisle.va...@gmail.com> wrote:
> I'm surprised no one has come across this compile
> error yet:
> epan/dissectors/packet-f5ethtrailer.c(482): error C2143: syntax error:
> missing ';' before '.'
> epan/dissectors/packet-f5ethtrailer.c(485): error C2224: left of '.S_addr'
> must have struct/union type
> epan/dissectors/packet-f5ethtrailer.c(487): error C2224: left of '.S_addr'
> must have struct/union type
>
> (using MSVC-2019).
>
> Reason seems simple; <winsock2.h> has snuck in somehow and
> added the wellknown "#define s_addr S_un.S_addr"
This isn't unique to Windows. It dates back to old BSD, in which struct
in_addr contained a union of multiple different types for an IP address, with
some types being structures breaking up the address into host and network bits,
and even included bits for IMP numbers. s_addr was defined to be the member of
the union that just defined an address as a 32-bit integer, so if you referred
to the s_addr "field" of the structure it gave you the 32-bit integer value.
Some OSes, including later versions of 4.xBSD, dropped that, with struct
in_addr having just a 32-bit-integer s_addr field; macOS was based on 4.4-Lite,
so it worked like that, and the current *BSDs are also based on that. Linux
probably picked that up, too.
However, Illumos still has that old stuff, so Solaris probably does so as well;
any code including <netinet/in.h>, directly or indirectly, could get bitten by
that.
In addition, we tend to use src_, rather than s_, as a prefix for "source", and
"dst_" or "dest" as a prefix for "destination", so I posted a change to rename
s_addr and d_addr to src_addr and dst_addr:
https://code.wireshark.org/review/36504
which should fix this.
(Why it's not happening with some Windows build environments is anybody's
guess. Different SDK versions? Different #defines?)
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