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/*
Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <arpa/inet.h>
#include <rpc/xdr.h>
#include <sys/uio.h>
#include <rpc/auth_unix.h>
#include <glusterfs/mem-pool.h>
#include "xdr-rpc.h"
#include "xdr-common.h"
#include <glusterfs/logging.h>
#include <glusterfs/common-utils.h>
/* Decodes the XDR format in msgbuf into rpc_msg.
* The remaining payload is returned into payload.
*/
int
xdr_to_rpc_call(char *msgbuf, size_t len, struct rpc_msg *call,
struct iovec *payload, char *credbytes, char *verfbytes)
{
XDR xdr;
char opaquebytes[GF_MAX_AUTH_BYTES];
struct opaque_auth *oa = NULL;
int ret = -1;
GF_VALIDATE_OR_GOTO("rpc", msgbuf, out);
GF_VALIDATE_OR_GOTO("rpc", call, out);
memset(call, 0, sizeof(*call));
oa = &call->rm_call.cb_cred;
if (!credbytes)
oa->oa_base = opaquebytes;
else
oa->oa_base = credbytes;
oa = &call->rm_call.cb_verf;
if (!verfbytes)
oa->oa_base = opaquebytes;
else
oa->oa_base = verfbytes;
xdrmem_create(&xdr, msgbuf, len, XDR_DECODE);
if (!xdr_callmsg(&xdr, call)) {
gf_log("rpc", GF_LOG_WARNING, "failed to decode call msg");
goto out;
}
if (payload) {
payload->iov_base = xdr_decoded_remaining_addr(xdr);
payload->iov_len = xdr_decoded_remaining_len(xdr);
}
ret = 0;
out:
return ret;
}
bool_t
true_func(XDR *s, caddr_t *a)
{
return TRUE;
}
int
rpc_fill_empty_reply(struct rpc_msg *reply, uint32_t xid)
{
int ret = -1;
GF_VALIDATE_OR_GOTO("rpc", reply, out);
/* Setting to 0 also results in reply verifier flavor to be
* set to AUTH_NULL which is what we want right now.
*/
memset(reply, 0, sizeof(*reply));
reply->rm_xid = xid;
reply->rm_direction = REPLY;
ret = 0;
out:
return ret;
}
int
rpc_fill_denied_reply(struct rpc_msg *reply, int rjstat, int auth_err)
{
int ret = -1;
GF_VALIDATE_OR_GOTO("rpc", reply, out);
reply->rm_reply.rp_stat = MSG_DENIED;
reply->rjcted_rply.rj_stat = rjstat;
if (rjstat == RPC_MISMATCH) {
/* No problem with hardcoding
* RPC version numbers. We only support
* v2 anyway.
*/
reply->rjcted_rply.rj_vers.low = 2;
reply->rjcted_rply.rj_vers.high = 2;
} else if (rjstat == AUTH_ERROR)
reply->rjcted_rply.rj_why = auth_err;
ret = 0;
out:
return ret;
}
int
rpc_fill_accepted_reply(struct rpc_msg *reply, int arstat, int proglow,
int proghigh, int verf, int len, char *vdata)
{
int ret = -1;
GF_VALIDATE_OR_GOTO("rpc", reply, out);
reply->rm_reply.rp_stat = MSG_ACCEPTED;
reply->acpted_rply.ar_stat = arstat;
reply->acpted_rply.ar_verf.oa_flavor = verf;
reply->acpted_rply.ar_verf.oa_length = len;
reply->acpted_rply.ar_verf.oa_base = vdata;
if (arstat == PROG_MISMATCH) {
reply->acpted_rply.ar_vers.low = proglow;
reply->acpted_rply.ar_vers.high = proghigh;
} else if (arstat == SUCCESS) {
/* This is a hack. I'd really like to build a custom
* XDR library because Sun RPC interface is not very flexible.
*/
reply->acpted_rply.ar_results.proc = (xdrproc_t)true_func;
reply->acpted_rply.ar_results.where = NULL;
}
ret = 0;
out:
return ret;
}
int
rpc_reply_to_xdr(struct rpc_msg *reply, char *dest, size_t len,
struct iovec *dst)
{
XDR xdr;
int ret = -1;
GF_VALIDATE_OR_GOTO("rpc", reply, out);
GF_VALIDATE_OR_GOTO("rpc", dest, out);
GF_VALIDATE_OR_GOTO("rpc", dst, out);
xdrmem_create(&xdr, dest, len, XDR_ENCODE);
if (!xdr_replymsg(&xdr, reply)) {
gf_log("rpc", GF_LOG_WARNING, "failed to encode reply msg");
goto out;
}
dst->iov_base = dest;
dst->iov_len = xdr_encoded_length(xdr);
ret = 0;
out:
return ret;
}
int
xdr_to_auth_unix_cred(char *msgbuf, int msglen, struct authunix_parms *au,
char *machname, gid_t *gids)
{
XDR xdr;
int ret = -1;
GF_VALIDATE_OR_GOTO("rpc", msgbuf, out);
GF_VALIDATE_OR_GOTO("rpc", machname, out);
GF_VALIDATE_OR_GOTO("rpc", gids, out);
GF_VALIDATE_OR_GOTO("rpc", au, out);
au->aup_machname = machname;
#if defined(GF_DARWIN_HOST_OS) || defined(__FreeBSD__)
au->aup_gids = (int *)gids;
#else
au->aup_gids = gids;
#endif
xdrmem_create(&xdr, msgbuf, msglen, XDR_DECODE);
if (!xdr_authunix_parms(&xdr, au)) {
gf_log("rpc", GF_LOG_WARNING, "failed to decode auth unix parms");
goto out;
}
ret = 0;
out:
return ret;
}
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