The format of hostfwd parameter is:
hostfwd=hostpart-guestaddr:guestport
so a minus sign can not be part of the hostpart.
If hostpart specifies a unix socket path, this becomes problematic.
To solve this, look for the LAST minus/dash char in the string,
not first.
Unfortunately, [-guestaddr] is optional (defaults to 10.0.0.15),
so we still can't parse the thing in an uniform way.
Extend get_str_sep() to accept negative separator to indicate searching
from the end of buffer, to find the last occurence. Update slirp_hostfwd
to search for the last separator when parsing unix domain socket path.
Inspired-by: Christopher Palmer-Richez <crichez@pm.me>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/347
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2ec80ad928