[PATCH] iphlpapi: fix the usage of Linux's unprivileged ICMP sockets

[Damjan Jovanovic]

Linux's unprivileged ICMP sockets are completely broken in Wine, and
radically differ from MacOS's. Linux doesn't provide IP headers but
reports some of the IP header data in the recvmsg() ancillary data,
overwrites icmp_id with its own value (a "port" number you can bind()
to but can't getsockname()), and on error MSG_ERRQUEUE reads the
offending packet's ICMP instead of the reply's while ancillary data
provides some of the reply's ICMP fields.

This patch fixes these issues and gets Linux's parody implementation
to a largely functional level.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=8332
Signed-off-by: Damjan Jovanovic <damjan.jov(a)gmail.com>
---
 dlls/iphlpapi/icmp.c | 173 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 168 insertions(+), 5 deletions(-)