2011-02-06 07:45:09 +03:00
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/*
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Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <strings.h>
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2011-06-01 20:06:15 +04:00
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#include <stdlib.h>
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2011-06-26 12:24:24 +04:00
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#include <errno.h>
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2011-06-01 20:06:15 +04:00
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#include <rpc/rpc.h>
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2011-02-06 07:45:09 +03:00
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#include <rpc/xdr.h>
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#include <rpc/rpc_msg.h>
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#include "slist.h"
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#include "libnfs.h"
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#include "libnfs-raw.h"
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#include "libnfs-private.h"
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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)
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{
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struct rpc_pdu *pdu;
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struct rpc_msg msg;
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if (rpc == NULL) {
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return NULL;
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}
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pdu = malloc(sizeof(struct rpc_pdu));
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if (pdu == NULL) {
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2011-06-19 03:38:20 +04:00
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rpc_set_error(rpc, "Out of memory: Failed to allocate pdu structure");
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2011-02-06 07:45:09 +03:00
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return NULL;
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}
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bzero(pdu, sizeof(struct rpc_pdu));
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pdu->xid = rpc->xid++;
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pdu->cb = cb;
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pdu->private_data = private_data;
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pdu->xdr_decode_fn = xdr_decode_fn;
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pdu->xdr_decode_bufsize = xdr_decode_bufsize;
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xdrmem_create(&pdu->xdr, rpc->encodebuf, rpc->encodebuflen, XDR_ENCODE);
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2011-06-26 11:30:00 +04:00
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if (rpc->is_udp == 0) {
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xdr_setpos(&pdu->xdr, 4); /* skip past the record marker */
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}
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2011-02-06 07:45:09 +03:00
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bzero(&msg, sizeof(struct rpc_msg));
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msg.rm_xid = pdu->xid;
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msg.rm_direction = CALL;
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msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
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msg.rm_call.cb_prog = program;
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msg.rm_call.cb_vers = version;
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msg.rm_call.cb_proc = procedure;
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msg.rm_call.cb_cred = rpc->auth->ah_cred;
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msg.rm_call.cb_verf = rpc->auth->ah_verf;
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if (xdr_callmsg(&pdu->xdr, &msg) == 0) {
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2011-06-19 03:38:20 +04:00
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rpc_set_error(rpc, "xdr_callmsg failed");
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2011-02-06 07:45:09 +03:00
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xdr_destroy(&pdu->xdr);
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free(pdu);
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return NULL;
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}
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return pdu;
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}
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void rpc_free_pdu(struct rpc_context *rpc _U_, struct rpc_pdu *pdu)
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{
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if (pdu->outdata.data != NULL) {
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free(pdu->outdata.data);
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pdu->outdata.data = NULL;
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}
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if (pdu->xdr_decode_buf != NULL) {
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xdr_free(pdu->xdr_decode_fn, pdu->xdr_decode_buf);
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free(pdu->xdr_decode_buf);
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pdu->xdr_decode_buf = NULL;
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}
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xdr_destroy(&pdu->xdr);
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2011-06-19 16:31:34 +04:00
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2011-02-06 07:45:09 +03:00
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free(pdu);
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}
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int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
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{
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int size, recordmarker;
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size = xdr_getpos(&pdu->xdr);
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2011-06-26 12:24:24 +04:00
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/* for udp we dont queue, we just send it straight away */
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if (rpc->is_udp != 0) {
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if (sendto(rpc->fd, rpc->encodebuf, size, MSG_DONTWAIT, rpc->udp_dest, sizeof(struct sockaddr_in)) < 0) {
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rpc_set_error(rpc, "Sendto failed with errno %s", strerror(errno));
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rpc_free_pdu(rpc, pdu);
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return -1;
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}
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SLIST_ADD_END(&rpc->waitpdu, pdu);
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return 0;
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}
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2011-02-06 07:45:09 +03:00
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/* write recordmarker */
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xdr_setpos(&pdu->xdr, 0);
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recordmarker = (size - 4) | 0x80000000;
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xdr_int(&pdu->xdr, &recordmarker);
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pdu->outdata.size = size;
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pdu->outdata.data = malloc(pdu->outdata.size);
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if (pdu->outdata.data == NULL) {
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rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
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rpc_free_pdu(rpc, pdu);
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return -1;
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}
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memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
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SLIST_ADD_END(&rpc->outqueue, pdu);
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return 0;
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}
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int rpc_get_pdu_size(char *buf)
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{
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uint32_t size;
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size = ntohl(*(uint32_t *)buf);
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if ((size & 0x80000000) == 0) {
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2011-06-19 03:38:20 +04:00
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/* cant handle oncrpc fragments */
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2011-02-06 07:45:09 +03:00
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return -1;
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}
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return (size & 0x7fffffff) + 4;
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}
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static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, XDR *xdr)
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{
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struct rpc_msg msg;
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bzero(&msg, sizeof(struct rpc_msg));
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msg.acpted_rply.ar_verf = _null_auth;
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if (pdu->xdr_decode_bufsize > 0) {
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pdu->xdr_decode_buf = malloc(pdu->xdr_decode_bufsize);
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if (pdu->xdr_decode_buf == NULL) {
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2011-06-19 03:38:20 +04:00
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rpc_set_error(rpc, "xdr_replymsg failed in portmap_getport_reply");
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2011-02-06 07:45:09 +03:00
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pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate buffer for decoding of XDR reply", pdu->private_data);
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return 0;
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}
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bzero(pdu->xdr_decode_buf, pdu->xdr_decode_bufsize);
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}
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msg.acpted_rply.ar_results.where = pdu->xdr_decode_buf;
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msg.acpted_rply.ar_results.proc = pdu->xdr_decode_fn;
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if (xdr_replymsg(xdr, &msg) == 0) {
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2011-06-19 03:38:20 +04:00
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rpc_set_error(rpc, "xdr_replymsg failed in portmap_getport_reply");
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2011-02-06 07:45:09 +03:00
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pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server", pdu->private_data);
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if (pdu->xdr_decode_buf != NULL) {
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free(pdu->xdr_decode_buf);
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pdu->xdr_decode_buf = NULL;
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}
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return 0;
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}
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if (msg.rm_reply.rp_stat != MSG_ACCEPTED) {
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pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
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return 0;
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}
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switch (msg.rm_reply.rp_acpt.ar_stat) {
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case SUCCESS:
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pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->xdr_decode_buf, pdu->private_data);
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break;
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case PROG_UNAVAIL:
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pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
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break;
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case PROG_MISMATCH:
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pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
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break;
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case PROC_UNAVAIL:
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pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
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break;
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case GARBAGE_ARGS:
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pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
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break;
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case SYSTEM_ERR:
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pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
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break;
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default:
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pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
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break;
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}
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return 0;
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}
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int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size)
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{
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struct rpc_pdu *pdu;
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XDR xdr;
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int pos, recordmarker;
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unsigned int xid;
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bzero(&xdr, sizeof(XDR));
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xdrmem_create(&xdr, buf, size, XDR_DECODE);
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2011-06-26 12:24:24 +04:00
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if (rpc->is_udp == 0) {
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if (xdr_int(&xdr, &recordmarker) == 0) {
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rpc_set_error(rpc, "xdr_int reading recordmarker failed");
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xdr_destroy(&xdr);
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return -1;
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}
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2011-02-06 07:45:09 +03:00
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}
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pos = xdr_getpos(&xdr);
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if (xdr_int(&xdr, (int *)&xid) == 0) {
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2011-06-19 03:38:20 +04:00
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rpc_set_error(rpc, "xdr_int reading xid failed");
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2011-02-06 07:45:09 +03:00
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xdr_destroy(&xdr);
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return -1;
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}
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xdr_setpos(&xdr, pos);
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for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
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if (pdu->xid != xid) {
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continue;
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}
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2011-06-26 12:24:24 +04:00
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if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
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SLIST_REMOVE(&rpc->waitpdu, pdu);
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}
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2011-02-06 07:45:09 +03:00
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if (rpc_process_reply(rpc, pdu, &xdr) != 0) {
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2011-06-19 03:38:20 +04:00
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rpc_set_error(rpc, "rpc_procdess_reply failed");
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2011-02-06 07:45:09 +03:00
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}
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xdr_destroy(&xdr);
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2011-06-26 12:24:24 +04:00
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if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
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rpc_free_pdu(rpc, pdu);
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}
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2011-02-06 07:45:09 +03:00
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return 0;
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}
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2011-06-19 03:38:20 +04:00
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rpc_set_error(rpc, "No matching pdu found for xid:%d", xid);
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2011-02-06 07:45:09 +03:00
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xdr_destroy(&xdr);
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return -1;
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}
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