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/*
Copyright (C) by Ronnie Sahlberg <ronniesahlberg@gmail.com> 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <strings.h>
#include <rpc/xdr.h>
#include <rpc/rpc_msg.h>
#include <ccan/compiler/compiler.h>
#include "dlinklist.h"
#include "nfs.h"
#include "libnfs-raw.h"
#include "libnfs-private.h"
struct rpc_pdu *rpc_allocate_pdu(struct rpc_context *rpc, int program, int version, int procedure, rpc_cb cb, void *private_data, xdrproc_t xdr_decode_fn, int xdr_decode_bufsize)
{
struct rpc_pdu *pdu;
struct rpc_msg msg;
if (rpc == NULL) {
printf("trying to allocate rpc pdu on NULL context\n");
return NULL;
}
pdu = malloc(sizeof(struct rpc_pdu));
if (pdu == NULL) {
printf("Failed to allocate pdu structure\n");
return NULL;
}
bzero(pdu, sizeof(struct rpc_pdu));
pdu->xid = rpc->xid++;
pdu->cb = cb;
pdu->private_data = private_data;
pdu->xdr_decode_fn = xdr_decode_fn;
pdu->xdr_decode_bufsize = xdr_decode_bufsize;
xdrmem_create(&pdu->xdr, rpc->encodebuf, rpc->encodebuflen, XDR_ENCODE);
xdr_setpos(&pdu->xdr, 4); /* skip past the record marker */
bzero(&msg, sizeof(struct rpc_msg));
msg.rm_xid = pdu->xid;
msg.rm_direction = CALL;
msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
msg.rm_call.cb_prog = program;
msg.rm_call.cb_vers = version;
msg.rm_call.cb_proc = procedure;
msg.rm_call.cb_cred = rpc->auth->ah_cred;
msg.rm_call.cb_verf = rpc->auth->ah_verf;
if (xdr_callmsg(&pdu->xdr, &msg) == 0) {
printf("xdr_callmsg failed\n");
xdr_destroy(&pdu->xdr);
free(pdu);
return NULL;
}
return pdu;
}
void rpc_free_pdu(struct rpc_context *rpc UNUSED, struct rpc_pdu *pdu)
{
if (pdu->outdata.data != NULL) {
free(pdu->outdata.data);
pdu->outdata.data = NULL;
}
if (pdu->xdr_decode_buf != NULL) {
xdr_free(pdu->xdr_decode_fn, pdu->xdr_decode_buf);
free(pdu->xdr_decode_buf);
pdu->xdr_decode_buf = NULL;
}
xdr_destroy(&pdu->xdr);
free(pdu);
}
int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
{
int size, recordmarker;
size = xdr_getpos(&pdu->xdr);
/* write recordmarker */
xdr_setpos(&pdu->xdr, 0);
recordmarker = (size - 4) | 0x80000000;
xdr_int(&pdu->xdr, &recordmarker);
pdu->outdata.size = size;
pdu->outdata.data = malloc(pdu->outdata.size);
if (pdu->outdata.data == NULL) {
rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
rpc_free_pdu(rpc, pdu);
return -1;
}
memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
DLIST_ADD_END(rpc->outqueue, pdu, NULL);
return 0;
}
int rpc_get_pdu_size(char *buf)
{
uint32_t size;
size = ntohl(*(uint32_t *)buf);
if ((size & 0x80000000) == 0) {
printf("cant handle oncrpc fragments\n");
return -1;
}
return (size & 0x7fffffff) + 4;
}
static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, XDR *xdr)
{
struct rpc_msg msg;
bzero(&msg, sizeof(struct rpc_msg));
msg.acpted_rply.ar_verf = _null_auth;
if (pdu->xdr_decode_bufsize > 0) {
pdu->xdr_decode_buf = malloc(pdu->xdr_decode_bufsize);
if (pdu->xdr_decode_buf == NULL) {
printf("xdr_replymsg failed in portmap_getport_reply\n");
pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate buffer for decoding of XDR reply", pdu->private_data);
return 0;
}
bzero(pdu->xdr_decode_buf, pdu->xdr_decode_bufsize);
}
msg.acpted_rply.ar_results.where = pdu->xdr_decode_buf;
msg.acpted_rply.ar_results.proc = pdu->xdr_decode_fn;
if (xdr_replymsg(xdr, &msg) == 0) {
printf("xdr_replymsg failed in portmap_getport_reply\n");
pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server", pdu->private_data);
if (pdu->xdr_decode_buf != NULL) {
free(pdu->xdr_decode_buf);
pdu->xdr_decode_buf = NULL;
}
return 0;
}
if (msg.rm_reply.rp_stat != MSG_ACCEPTED) {
pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
return 0;
}
switch (msg.rm_reply.rp_acpt.ar_stat) {
case SUCCESS:
pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->xdr_decode_buf, pdu->private_data);
break;
case PROG_UNAVAIL:
pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
break;
case PROG_MISMATCH:
pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
break;
case PROC_UNAVAIL:
pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
break;
case GARBAGE_ARGS:
pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
break;
case SYSTEM_ERR:
pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
break;
default:
pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
break;
}
return 0;
}
int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size)
{
struct rpc_pdu *pdu;
XDR xdr;
int pos, recordmarker;
unsigned int xid;
bzero(&xdr, sizeof(XDR));
xdrmem_create(&xdr, buf, size, XDR_DECODE);
if (xdr_int(&xdr, &recordmarker) == 0) {
printf("xdr_int reading recordmarker failed\n");
xdr_destroy(&xdr);
return -1;
}
pos = xdr_getpos(&xdr);
if (xdr_int(&xdr, (int *)&xid) == 0) {
printf("xdr_int reading xid failed\n");
xdr_destroy(&xdr);
return -1;
}
xdr_setpos(&xdr, pos);
for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
if (pdu->xid != xid) {
continue;
}
DLIST_REMOVE(rpc->waitpdu, pdu);
if (rpc_process_reply(rpc, pdu, &xdr) != 0) {
printf("rpc_procdess_reply failed\n");
}
xdr_destroy(&xdr);
rpc_free_pdu(rpc, pdu);
return 0;
}
printf("No matching pdu found for xid:%d\n", xid);
xdr_destroy(&xdr);
return -1;
}
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