[deb_libnfs.git] / lib / pdu.c

/*
   Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <strings.h>
#include <stdlib.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpc/rpc_msg.h>
#include "slist.h"
#include "libnfs.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) {
		return NULL;
	}

	pdu = malloc(sizeof(struct rpc_pdu));
	if (pdu == NULL) {
		rpc_set_error(rpc, "Out of memory: Failed to allocate pdu structure");
		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) {
		rpc_set_error(rpc, "xdr_callmsg failed");
		xdr_destroy(&pdu->xdr);
		free(pdu);
		return NULL;
	}

	return pdu;
}

void rpc_free_pdu(struct rpc_context *rpc _U_, 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);
	SLIST_ADD_END(&rpc->outqueue, pdu);

	return 0;
}

int rpc_get_pdu_size(char *buf)
{
	uint32_t size;

	size = ntohl(*(uint32_t *)buf);

	if ((size & 0x80000000) == 0) {
		/* cant handle oncrpc fragments */
		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) {
			rpc_set_error(rpc, "xdr_replymsg failed in portmap_getport_reply");
			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) {
		rpc_set_error(rpc, "xdr_replymsg failed in portmap_getport_reply");
		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) {
		rpc_set_error(rpc, "xdr_int reading recordmarker failed");
		xdr_destroy(&xdr);
		return -1;
	}
	pos = xdr_getpos(&xdr);
	if (xdr_int(&xdr, (int *)&xid) == 0) {
		rpc_set_error(rpc, "xdr_int reading xid failed");
		xdr_destroy(&xdr);
		return -1;
	}
	xdr_setpos(&xdr, pos);

	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
		if (pdu->xid != xid) {
			continue;
		}
		SLIST_REMOVE(&rpc->waitpdu, pdu);
		if (rpc_process_reply(rpc, pdu, &xdr) != 0) {
			rpc_set_error(rpc, "rpc_procdess_reply failed");
		}
		xdr_destroy(&xdr);
		rpc_free_pdu(rpc, pdu);
		return 0;
	}
	rpc_set_error(rpc, "No matching pdu found for xid:%d", xid);
	xdr_destroy(&xdr);
	return -1;
}
Commit	Line	Data
84004dbf RS	1	/*
	2	Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
	3
	4	This program is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU Lesser General Public License as published by
	6	the Free Software Foundation; either version 2.1 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	GNU Lesser General Public License for more details.
	13
	14	You should have received a copy of the GNU Lesser General Public License
	15	along with this program; if not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	#include <stdio.h>
	19	#include <strings.h>
98f5fee8 M	20	#include <stdlib.h>
98f5fee8 M	21	#include <rpc/rpc.h>
84004dbf RS	22	#include <rpc/xdr.h>
	23	#include <rpc/rpc_msg.h>
	24	#include "slist.h"
	25	#include "libnfs.h"
	26	#include "libnfs-raw.h"
	27	#include "libnfs-private.h"
	28
	29	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)
	30	{
	31	struct rpc_pdu *pdu;
	32	struct rpc_msg msg;
	33
	34	if (rpc == NULL) {
84004dbf RS	35	return NULL;
	36	}
	37
	38	pdu = malloc(sizeof(struct rpc_pdu));
	39	if (pdu == NULL) {
1896d37b	40	rpc_set_error(rpc, "Out of memory: Failed to allocate pdu structure");
84004dbf RS	41	return NULL;
	42	}
	43	bzero(pdu, sizeof(struct rpc_pdu));
	44	pdu->xid = rpc->xid++;
	45	pdu->cb = cb;
	46	pdu->private_data = private_data;
	47	pdu->xdr_decode_fn = xdr_decode_fn;
	48	pdu->xdr_decode_bufsize = xdr_decode_bufsize;
	49
	50	xdrmem_create(&pdu->xdr, rpc->encodebuf, rpc->encodebuflen, XDR_ENCODE);
	51	xdr_setpos(&pdu->xdr, 4); /* skip past the record marker */
	52
	53	bzero(&msg, sizeof(struct rpc_msg));
	54	msg.rm_xid = pdu->xid;
	55	msg.rm_direction = CALL;
	56	msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
	57	msg.rm_call.cb_prog = program;
	58	msg.rm_call.cb_vers = version;
	59	msg.rm_call.cb_proc = procedure;
	60	msg.rm_call.cb_cred = rpc->auth->ah_cred;
	61	msg.rm_call.cb_verf = rpc->auth->ah_verf;
	62
	63	if (xdr_callmsg(&pdu->xdr, &msg) == 0) {
1896d37b	64	rpc_set_error(rpc, "xdr_callmsg failed");
84004dbf RS	65	xdr_destroy(&pdu->xdr);
	66	free(pdu);
	67	return NULL;
	68	}
	69
	70	return pdu;
	71	}
	72
	73	void rpc_free_pdu(struct rpc_context rpc _U_, struct rpc_pdu pdu)
	74	{
	75	if (pdu->outdata.data != NULL) {
	76	free(pdu->outdata.data);
	77	pdu->outdata.data = NULL;
	78	}
	79
	80	if (pdu->xdr_decode_buf != NULL) {
	81	xdr_free(pdu->xdr_decode_fn, pdu->xdr_decode_buf);
	82	free(pdu->xdr_decode_buf);
	83	pdu->xdr_decode_buf = NULL;
	84	}
	85
	86	xdr_destroy(&pdu->xdr);
	87	free(pdu);
	88	}
	89
	90
	91	int rpc_queue_pdu(struct rpc_context rpc, struct rpc_pdu pdu)
	92	{
	93	int size, recordmarker;
	94
	95	size = xdr_getpos(&pdu->xdr);
	96
	97	/* write recordmarker */
	98	xdr_setpos(&pdu->xdr, 0);
	99	recordmarker = (size - 4) \| 0x80000000;
	100	xdr_int(&pdu->xdr, &recordmarker);
	101
	102	pdu->outdata.size = size;
	103	pdu->outdata.data = malloc(pdu->outdata.size);
	104	if (pdu->outdata.data == NULL) {
	105	rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
	106	rpc_free_pdu(rpc, pdu);
	107	return -1;
	108	}
	109
	110	memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
	111	SLIST_ADD_END(&rpc->outqueue, pdu);
	112
	113	return 0;
	114	}
	115
	116	int rpc_get_pdu_size(char *buf)
	117	{
	118	uint32_t size;
	119
	120	size = ntohl((uint32_t )buf);
	121
	122	if ((size & 0x80000000) == 0) {
1896d37b	123	/* cant handle oncrpc fragments */
84004dbf RS	124	return -1;
	125	}
	126
	127	return (size & 0x7fffffff) + 4;
	128	}
	129
	130	static int rpc_process_reply(struct rpc_context rpc, struct rpc_pdu pdu, XDR *xdr)
	131	{
	132	struct rpc_msg msg;
	133
	134	bzero(&msg, sizeof(struct rpc_msg));
	135	msg.acpted_rply.ar_verf = _null_auth;
	136	if (pdu->xdr_decode_bufsize > 0) {
	137	pdu->xdr_decode_buf = malloc(pdu->xdr_decode_bufsize);
	138	if (pdu->xdr_decode_buf == NULL) {
1896d37b	139	rpc_set_error(rpc, "xdr_replymsg failed in portmap_getport_reply");
84004dbf RS	140	pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate buffer for decoding of XDR reply", pdu->private_data);
	141	return 0;
	142	}
	143	bzero(pdu->xdr_decode_buf, pdu->xdr_decode_bufsize);
	144	}
	145	msg.acpted_rply.ar_results.where = pdu->xdr_decode_buf;
	146	msg.acpted_rply.ar_results.proc = pdu->xdr_decode_fn;
	147
	148	if (xdr_replymsg(xdr, &msg) == 0) {
1896d37b	149	rpc_set_error(rpc, "xdr_replymsg failed in portmap_getport_reply");
84004dbf RS	150	pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server", pdu->private_data);
	151	if (pdu->xdr_decode_buf != NULL) {
	152	free(pdu->xdr_decode_buf);
	153	pdu->xdr_decode_buf = NULL;
	154	}
	155	return 0;
	156	}
	157	if (msg.rm_reply.rp_stat != MSG_ACCEPTED) {
	158	pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
	159	return 0;
	160	}
	161	switch (msg.rm_reply.rp_acpt.ar_stat) {
	162	case SUCCESS:
	163	pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->xdr_decode_buf, pdu->private_data);
	164	break;
	165	case PROG_UNAVAIL:
	166	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
	167	break;
	168	case PROG_MISMATCH:
	169	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
	170	break;
	171	case PROC_UNAVAIL:
	172	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
	173	break;
	174	case GARBAGE_ARGS:
	175	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
	176	break;
	177	case SYSTEM_ERR:
	178	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
	179	break;
	180	default:
	181	pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
	182	break;
	183	}
	184
	185	return 0;
	186	}
	187
	188	int rpc_process_pdu(struct rpc_context rpc, char buf, int size)
	189	{
	190	struct rpc_pdu *pdu;
	191	XDR xdr;
	192	int pos, recordmarker;
	193	unsigned int xid;
	194
	195	bzero(&xdr, sizeof(XDR));
	196
	197	xdrmem_create(&xdr, buf, size, XDR_DECODE);
	198	if (xdr_int(&xdr, &recordmarker) == 0) {
1896d37b	199	rpc_set_error(rpc, "xdr_int reading recordmarker failed");
84004dbf RS	200	xdr_destroy(&xdr);
	201	return -1;
	202	}
	203	pos = xdr_getpos(&xdr);
	204	if (xdr_int(&xdr, (int *)&xid) == 0) {
1896d37b	205	rpc_set_error(rpc, "xdr_int reading xid failed");
84004dbf RS	206	xdr_destroy(&xdr);
	207	return -1;
	208	}
	209	xdr_setpos(&xdr, pos);
	210
	211	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	212	if (pdu->xid != xid) {
	213	continue;
	214	}
	215	SLIST_REMOVE(&rpc->waitpdu, pdu);
	216	if (rpc_process_reply(rpc, pdu, &xdr) != 0) {
1896d37b	217	rpc_set_error(rpc, "rpc_procdess_reply failed");
84004dbf RS	218	}
	219	xdr_destroy(&xdr);
	220	rpc_free_pdu(rpc, pdu);
	221	return 0;
	222	}
1896d37b	223	rpc_set_error(rpc, "No matching pdu found for xid:%d", xid);
84004dbf RS	224	xdr_destroy(&xdr);
	225	return -1;
	226	}
	227