Otherwise it segfaults inside any string decoding inside rpc_process_call()
as it doesn't zero the allocated memory, so libnfs_zdr_string() may receive
non-zero *strp which is very easy to reproduce by writing a simple NFS server
example using libnfs :-)
In zdr_array we can not use the check that num_elements * element_size
will fit inside the remaining bytes in the ZDR buffer.
The reason for this is that IF it is an array of unions, then
element-size will have the size of the largest arm in that union.
If the array consists of union items that are smaller than the largest arm,
then it becomes likely that this will pack in less than num_elements *
element_size and this it is possible that the array WILL fir in the remaining
bytes.
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
If we are decoding a zdr string and the called did not provide
a pointer/buffer for us. We can just return the string to the rx buffer
immediately and avoid calling libnfs_zdr_opaque().
This avoids wasting cpu cycles on running a memcpy where src and dst buffers
are the same.
Update the configure to add some sanity -W arguments.
A good start is probably :
-Wall -Werror -Wshadow -Wno-write-strings -Wstrict-prototypes
-Wpointer-arith -Wcast-align -Wno-strict-aliasing
Fixup the paces in the code that triggers.
(one of which is readahead code which is perhaps broken?)
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
All current platforms have a quad type that maps to a 64bit scalar.
But there are platforms where quad maps to a 64bit non-scalar.
Replace quad with int64 in the protocol definitions and the ZDR layer
so that these fields will map to a 64 bit scalar also on those platforms
where quad can not be used.
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Include the proper headers to fix warnings like:
libnfs-sync.c:1529:3: warning: implicit declaration of function 'gettimeofday' [-Wimplicit-function-declaration]
libnfs-zdr.c:506:2: warning: implicit declaration of function 'getuid' [-Wimplicit-function-declaration]
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
sys/time.h needs to be protected with an ifdef
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
use getgid() as the group instead of -1.
Recent linux knfsd do not allow grp==-1
On windows there are no uid/gids in the traditional sense so there I still specify a default credential of uid==gid==-1 :
rpc->auth = authunix_create("LibNFS", 65535, 65535, 0, NULL);
This is I think the sanest/safest thing to do since most servers will have
special handing of -1 meaning 'nobody' or similar.
This should work on many/most servers and give the user the minimum available
access allowed for 'nobody'.
I think on windows (or AROS for that matter) applications will probably have
to invoke and set the credentials themself explicitely.
Those apps probably, unfortunately, also need to have a configuration
setting to select which uid/gid to use when talking to the server.
(or they could hardcode it)
rpc_set_auth(rpc, libnfs_authunix_create("hostname", uid, gid, 0, NULL))
should do the trick if they call immediately after creating the rpc/nfs context.
But dont set it to 0,0 root/root for uid/gid.
First of all, most servers have root-squash so they will re-map this uid/gid
to 'nobody' internally.
But, if the user uses a server that does not do root-squash, then setting this to 0,0 would mean that your app now access the nfs share as root which is probably not what you want.
This patch switches libnfs over to use precompiled rpcgen files
and using ZDR. ZDR is a trivial reimplementation of XDR that is built in
into libnfs.
This removes the dependencies of rpc/xdr completely and allow us to build on any
system, even systems where rpcgen and librpc/libxdr are not generally available.
Vitaliy Filippov
Ronnie Sahlberg