CVS commit: src/lib/librumphijack

["Antti Kantee" <pooka%netbsd.org@localhost>]

Module Name:    src
Committed By:   pooka
Date:           Fri Jan  7 19:52:43 UTC 2011

Added Files:
        src/lib/librumphijack: Makefile hijack.c shlib_version

Log Message:
Begin work on a syscall hijacking library which can be LD_PRELOADed
to convince non-rumped applications to communicate with a rump
kernel instead of the host kernel.  The precision of what goes
where is not exactly surgical, but for example when wanting to
debug a web server's TCP/IP stack interaction, it might be enough.
When all you have is a hand grenade, all problems look like a ....
hmm?

There's still plenty to figure out.  For example, I'm not sure what
the user interface will be like.  Now it just attempts to hijack
network communication.  It also needs to sync with symbol renaming
in libc, and maybe autogenerate the non-schizophrenic wrappers
where the communication is heading to exactly one destination, lest
I'll be a mummmy by the time I finish writing them all.  As a fun
example of a non-non-schizophrenic one, consider poll().

Work in progress, but I managed to get two non-rumped netcats
talking to each other or fetching the index from a non-rumped
thttpd.  telnet works in one direction (i can read the data from
netcat, but anything i send back is not printed).  bozohttpd uses
dup2() which i haven't bothered to address yet, etcetc.

(not hooking this up the build for now)


To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/lib/librumphijack/Makefile \
    src/lib/librumphijack/hijack.c src/lib/librumphijack/shlib_version

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.