This catches direct references, so we can change them to use EXTRACT_U_1
or EXTRACT_S_1.
Also, change some structures to use the nd_ types that weren't already
using them.
Then make the appropriate EXTRACT_{U,S}_1() changes.
Define them in netdissect.h.
Use them in ip.h, and *don't* mark the structures as UNALIGNED; that
should no longer be necessary.
Add a new nd_ipv4 type to use as an IPv4 address; it represents the 4
bytes of IPv4 address as an array of unsigned chars, so that its natural
alignment is only on a byte boundary.
Those changes found some places where we weren't using
UNALIGNED_MEMCPY() to extract IPv4 addresses from packets; use it.
Remove lots of $Header's and a few $Id's that all belong to the former
CVS repository of tcpdump itself. These keywords have been frozen since
the migration to git in late 2008.
This prevents GCC on SPARC from generating code that assumes those
structures are aligned naturally, which they are not guaranteed to be.
Move some #defines from interface.h to tcpdump-stdinc.h to make them
available to code that doesn't include interface.h.
Move the declaration of nextproto6_cksum() to ip6.h, so that only files
that use it get it declared, and thus so that you don't need to define
"struct ip6_hdr" in everything that includes interface.h. Don't include
ip6.h in tcpdump-stdinc.h.
compile with Sun C, as "interface.h" isn't being included before the
structures are being declared.
Furthermore, in the files that Sun C *can* compile, it doesn't cause Sun
C to generate code that's safe with unaligned accesses, as
"__attribute__" is defined as a do-nothing macro with compilers that
don't support it.
Therefore, we get rid of that tag on the structures to which it was
added, and instead use "EXTRACT_16BIT()" and "EXTRACT_32BIT()" to fetch
16-bit and 32-bit big-endian quantities from packets. We also fix some
other references to multi-byte quantities to get rid of code that tries
to do unaligned loads on platforms that don't support them.
We also throw in a hack that makes those macros use
"__attribute__((packed))" on structures containing only one 16-bit or
32-bit integer to get the compiler to generate unaligned-safe code
rather than doing it by hand. (GCC on SPARC produces the same code that
doing it by hand does; I don't know if GCC on any other big-endian
strict-alignment processor generates better code for that case. On
little-endian processors, as "ntohs()" and "ntohl()" might be functions,
that might actually produce worse code.)
Fix some places to use "%u" rather than "%d" to print unsigned
quantities.
that bitfields other than "int" or "unsigned int" are allowed, some
compilers warn about them, and, given that the declaration of a bit
field says how many bits it is wide, declaring them "u_char" doesn't
have any advantage (other than making it a bit clearer, when reading the
header, that the bitfields in question are part of a single byte).
have dissectors include them rather than <netinet/ip.h> or
<netinet/ip_var.h>, if they actually need that stuff.
Put the declarations of the ICMP stuff directly into "print-icmp.c".
Remove all unnecessary includes of <netinet/ip*.h> files.
Copy the byte-order stuff from "nameser.h" into "tcp.h".
