[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/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef AROS
#include "aros_compat.h"
#endif

#ifdef WIN32
#include "win32_compat.h"
#endif

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include "slist.h"
#include "libnfs-zdr.h"
#include "libnfs.h"
#include "libnfs-raw.h"
#include "libnfs-private.h"

void rpc_reset_queue(struct rpc_queue *q)
{
	q->head = NULL;
	q->tail = NULL;
}

/*
 * Push to the tail end of the queue
 */
void rpc_enqueue(struct rpc_queue *q, struct rpc_pdu *pdu)
{
	if (q->head == NULL)
		q->head = pdu;
	else
		q->tail->next = pdu;
	q->tail = pdu;
	pdu->next = NULL;
}

/*
 * Push to the front/head of the queue
 */
void rpc_return_to_queue(struct rpc_queue *q, struct rpc_pdu *pdu)
{
	pdu->next = q->head;
	q->head = pdu;
	if (q->tail == NULL)
		q->tail = pdu;
}

struct rpc_pdu *rpc_allocate_pdu(struct rpc_context *rpc, int program, int version, int procedure, rpc_cb cb, void *private_data, zdrproc_t zdr_decode_fn, int zdr_decode_bufsize)
{
	struct rpc_pdu *pdu;
	struct rpc_msg msg;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	pdu = malloc(sizeof(struct rpc_pdu));
	if (pdu == NULL) {
		rpc_set_error(rpc, "Out of memory: Failed to allocate pdu structure");
		return NULL;
	}
	memset(pdu, 0, sizeof(struct rpc_pdu));
	pdu->xid                = rpc->xid++;
	pdu->cb                 = cb;
	pdu->private_data       = private_data;
	pdu->zdr_decode_fn      = zdr_decode_fn;
	pdu->zdr_decode_bufsize = zdr_decode_bufsize;

	zdrmem_create(&pdu->zdr, rpc->encodebuf, rpc->encodebuflen, ZDR_ENCODE);
	if (rpc->is_udp == 0) {
		zdr_setpos(&pdu->zdr, 4); /* skip past the record marker */
	}

	memset(&msg, 0, sizeof(struct rpc_msg));
	msg.xid                = pdu->xid;
        msg.direction          = CALL;
	msg.body.cbody.rpcvers = RPC_MSG_VERSION;
	msg.body.cbody.prog    = program;
	msg.body.cbody.vers    = version;
	msg.body.cbody.proc    = procedure;
	msg.body.cbody.cred    = rpc->auth->ah_cred;
	msg.body.cbody.verf    = rpc->auth->ah_verf;

	if (zdr_callmsg(rpc, &pdu->zdr, &msg) == 0) {
		rpc_set_error(rpc, "zdr_callmsg failed with %s",
			      rpc_get_error(rpc));
		zdr_destroy(&pdu->zdr);
		free(pdu);
		return NULL;
	}

	return pdu;
}

void rpc_free_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (pdu->outdata.data != NULL) {
		free(pdu->outdata.data);
		pdu->outdata.data = NULL;
	}

	if (pdu->zdr_decode_buf != NULL) {
		zdr_free(pdu->zdr_decode_fn, pdu->zdr_decode_buf);
		free(pdu->zdr_decode_buf);
		pdu->zdr_decode_buf = NULL;
	}

	zdr_destroy(&pdu->zdr);

	free(pdu);
}

void rpc_set_next_xid(struct rpc_context *rpc, uint32_t xid)
{
	rpc->xid = xid;
}

int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
{
	int size, recordmarker;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	size = zdr_getpos(&pdu->zdr);

	/* for udp we dont queue, we just send it straight away */
	if (rpc->is_udp != 0) {
// XXX add a rpc->udp_dest_sock_size  and get rid of sys/socket.h and netinet/in.h
		if (sendto(rpc->fd, rpc->encodebuf, size, MSG_DONTWAIT, rpc->udp_dest, sizeof(struct sockaddr_in)) < 0) {
			rpc_set_error(rpc, "Sendto failed with errno %s", strerror(errno));
			rpc_free_pdu(rpc, pdu);
			return -1;
		}
		rpc_enqueue(&rpc->waitpdu, pdu);
		return 0;
	}

	/* write recordmarker */
	zdr_setpos(&pdu->zdr, 0);
	recordmarker = (size - 4) | 0x80000000;
	zdr_int(&pdu->zdr, &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);
	rpc_enqueue(&rpc->outqueue, pdu);

	return 0;
}

int rpc_get_pdu_size(char *buf)
{
	uint32_t size;

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

	return (size & 0x7fffffff) + 4;
}

static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, ZDR *zdr)
{
	struct rpc_msg msg;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	memset(&msg, 0, sizeof(struct rpc_msg));
	msg.body.rbody.reply.areply.verf = _null_auth;
	if (pdu->zdr_decode_bufsize > 0) {
		if (pdu->zdr_decode_buf != NULL) {
			free(pdu->zdr_decode_buf);
		}
		pdu->zdr_decode_buf = malloc(pdu->zdr_decode_bufsize);
		if (pdu->zdr_decode_buf == NULL) {
			rpc_set_error(rpc, "Failed to allocate memory for "
				      "zdr_encode_buf in rpc_process_reply");
			pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate "
				"buffer for decoding of ZDR reply",
				pdu->private_data);
			return 0;
		}
		memset(pdu->zdr_decode_buf, 0, pdu->zdr_decode_bufsize);
	}
	msg.body.rbody.reply.areply.reply_data.results.where = pdu->zdr_decode_buf;
	msg.body.rbody.reply.areply.reply_data.results.proc  = pdu->zdr_decode_fn;

	if (zdr_replymsg(rpc, zdr, &msg) == 0) {
		rpc_set_error(rpc, "zdr_replymsg failed in rpc_process_reply: "
			      "%s", rpc_get_error(rpc));
		pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server",
			pdu->private_data);
		if (pdu->zdr_decode_buf != NULL) {
			free(pdu->zdr_decode_buf);
			pdu->zdr_decode_buf = NULL;
		}
		return 0;
	}
	if (msg.body.rbody.stat != MSG_ACCEPTED) {
		pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
		return 0;
	}
	switch (msg.body.rbody.reply.areply.stat) {
	case SUCCESS:
		pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->zdr_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, *prev_pdu;
	ZDR zdr;
	int pos, recordmarker = 0;
	uint32_t xid;
	char *reasbuf = NULL;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	memset(&zdr, 0, sizeof(ZDR));

	zdrmem_create(&zdr, buf, size, ZDR_DECODE);
	if (rpc->is_udp == 0) {
		if (zdr_int(&zdr, &recordmarker) == 0) {
			rpc_set_error(rpc, "zdr_int reading recordmarker failed");
			zdr_destroy(&zdr);
			return -1;
		}
		if (!(recordmarker&0x80000000)) {
			zdr_destroy(&zdr);
			if (rpc_add_fragment(rpc, buf+4, size-4) != 0) {
				rpc_set_error(rpc, "Failed to queue fragment for reassembly.");
				return -1;
			}
			return 0;
		}
	}

	/* reassembly */
	if (recordmarker != 0 && rpc->fragments != NULL) {
		struct rpc_fragment *fragment;
		uint32_t total = size - 4;
		char *ptr;

		zdr_destroy(&zdr);
		for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
			total += fragment->size;
		}

		reasbuf = malloc(total);
		if (reasbuf == NULL) {
			rpc_set_error(rpc, "Failed to reassemble PDU");
			rpc_free_all_fragments(rpc);
			return -1;
		}
		ptr = reasbuf;
		for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
			memcpy(ptr, fragment->data, fragment->size);
			ptr += fragment->size;
		}
		memcpy(ptr, buf + 4, size - 4);
		zdrmem_create(&zdr, reasbuf, total, ZDR_DECODE);
		rpc_free_all_fragments(rpc);
	}

	pos = zdr_getpos(&zdr);
	if (zdr_int(&zdr, (int *)&xid) == 0) {
		rpc_set_error(rpc, "zdr_int reading xid failed");
		zdr_destroy(&zdr);
		if (reasbuf != NULL) {
			free(reasbuf);
		}
		return -1;
	}
	zdr_setpos(&zdr, pos);

	/* Linear traverse singly-linked list, but track previous
	 * entry for optimised removal */
	prev_pdu = NULL;
	for (pdu=rpc->waitpdu.head; pdu; pdu=pdu->next) {
		if (pdu->xid != xid) {
			prev_pdu = pdu;
			continue;
		}
		if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
			/* Singly-linked but we track head and tail */
			if (pdu == rpc->waitpdu.head)
				rpc->waitpdu.head = pdu->next;
			if (pdu == rpc->waitpdu.tail)
				rpc->waitpdu.tail = prev_pdu;
			if (prev_pdu != NULL)
				prev_pdu->next = pdu->next;
		}
		if (rpc_process_reply(rpc, pdu, &zdr) != 0) {
			rpc_set_error(rpc, "rpc_procdess_reply failed");
		}
		zdr_destroy(&zdr);
		if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
			rpc_free_pdu(rpc, pdu);
		}
		if (reasbuf != NULL) {
			free(reasbuf);
		}
		return 0;
	}
	rpc_set_error(rpc, "No matching pdu found for xid:%d", xid);
	zdr_destroy(&zdr);
	if (reasbuf != NULL) {
		free(reasbuf);
	}
	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	*/
72897005 RS	17	#ifdef HAVE_CONFIG_H
	18	#include "config.h"
	19	#endif
	20
108c622a RS	21	#ifdef AROS
	22	#include "aros_compat.h"
	23	#endif
	24
a8a1b858 M	25	#ifdef WIN32
a8a1b858 M	26	#include "win32_compat.h"
bff8fe46	27	#endif
6874f61e	28
72897005 RS	29	#ifdef HAVE_NETINET_IN_H
	30	#include <netinet/in.h>
	31	#endif
	32
7057e733 RS	33	#ifdef HAVE_SYS_SOCKET_H
	34	#include <sys/socket.h>
	35	#endif
	36
bff8fe46 RS	37	#ifdef HAVE_STRINGS_H
	38	#include <strings.h>
	39	#endif
	40
6874f61e	41	#include <stdio.h>
98f5fee8	42	#include <stdlib.h>
763cd6e3	43	#include <string.h>
f3a75078	44	#include <assert.h>
a669857d	45	#include <errno.h>
84004dbf	46	#include "slist.h"
763cd6e3	47	#include "libnfs-zdr.h"
84004dbf RS	48	#include "libnfs.h"
	49	#include "libnfs-raw.h"
	50	#include "libnfs-private.h"
	51
aec45c62 MH	52	void rpc_reset_queue(struct rpc_queue *q)
	53	{
	54	q->head = NULL;
	55	q->tail = NULL;
	56	}
	57
	58	/*
	59	* Push to the tail end of the queue
	60	*/
	61	void rpc_enqueue(struct rpc_queue q, struct rpc_pdu pdu)
	62	{
	63	if (q->head == NULL)
	64	q->head = pdu;
	65	else
	66	q->tail->next = pdu;
	67	q->tail = pdu;
d46c3d62	68	pdu->next = NULL;
aec45c62 MH	69	}
	70
	71	/*
	72	* Push to the front/head of the queue
	73	*/
	74	void rpc_return_to_queue(struct rpc_queue q, struct rpc_pdu pdu)
	75	{
	76	pdu->next = q->head;
	77	q->head = pdu;
	78	if (q->tail == NULL)
	79	q->tail = pdu;
	80	}
	81
763cd6e3	82	struct rpc_pdu rpc_allocate_pdu(struct rpc_context rpc, int program, int version, int procedure, rpc_cb cb, void *private_data, zdrproc_t zdr_decode_fn, int zdr_decode_bufsize)
84004dbf RS	83	{
	84	struct rpc_pdu *pdu;
	85	struct rpc_msg msg;
	86
f3a75078	87	assert(rpc->magic == RPC_CONTEXT_MAGIC);
84004dbf RS	88
	89	pdu = malloc(sizeof(struct rpc_pdu));
	90	if (pdu == NULL) {
1896d37b	91	rpc_set_error(rpc, "Out of memory: Failed to allocate pdu structure");
84004dbf RS	92	return NULL;
84004dbf RS	93	}
ea98629a	94	memset(pdu, 0, sizeof(struct rpc_pdu));
84004dbf RS	95	pdu->xid = rpc->xid++;
	96	pdu->cb = cb;
	97	pdu->private_data = private_data;
763cd6e3 RS	98	pdu->zdr_decode_fn = zdr_decode_fn;
763cd6e3 RS	99	pdu->zdr_decode_bufsize = zdr_decode_bufsize;
84004dbf	100
763cd6e3	101	zdrmem_create(&pdu->zdr, rpc->encodebuf, rpc->encodebuflen, ZDR_ENCODE);
a1992412	102	if (rpc->is_udp == 0) {
763cd6e3	103	zdr_setpos(&pdu->zdr, 4); /* skip past the record marker */
a1992412	104	}
84004dbf	105
ea98629a	106	memset(&msg, 0, sizeof(struct rpc_msg));
aab6538b RS	107	msg.xid = pdu->xid;
	108	msg.direction = CALL;
	109	msg.body.cbody.rpcvers = RPC_MSG_VERSION;
	110	msg.body.cbody.prog = program;
	111	msg.body.cbody.vers = version;
	112	msg.body.cbody.proc = procedure;
	113	msg.body.cbody.cred = rpc->auth->ah_cred;
	114	msg.body.cbody.verf = rpc->auth->ah_verf;
84004dbf	115
f0cb8042 RS	116	if (zdr_callmsg(rpc, &pdu->zdr, &msg) == 0) {
	117	rpc_set_error(rpc, "zdr_callmsg failed with %s",
	118	rpc_get_error(rpc));
763cd6e3	119	zdr_destroy(&pdu->zdr);
84004dbf RS	120	free(pdu);
	121	return NULL;
	122	}
	123
	124	return pdu;
	125	}
	126
f3a75078	127	void rpc_free_pdu(struct rpc_context rpc, struct rpc_pdu pdu)
84004dbf	128	{
f3a75078 RS	129	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	130
84004dbf RS	131	if (pdu->outdata.data != NULL) {
	132	free(pdu->outdata.data);
	133	pdu->outdata.data = NULL;
	134	}
	135
763cd6e3 RS	136	if (pdu->zdr_decode_buf != NULL) {
	137	zdr_free(pdu->zdr_decode_fn, pdu->zdr_decode_buf);
	138	free(pdu->zdr_decode_buf);
	139	pdu->zdr_decode_buf = NULL;
84004dbf RS	140	}
84004dbf RS	141
763cd6e3	142	zdr_destroy(&pdu->zdr);
df5af25f	143
84004dbf RS	144	free(pdu);
	145	}
	146
3b943d2f RS	147	void rpc_set_next_xid(struct rpc_context *rpc, uint32_t xid)
	148	{
	149	rpc->xid = xid;
	150	}
84004dbf RS	151
	152	int rpc_queue_pdu(struct rpc_context rpc, struct rpc_pdu pdu)
	153	{
	154	int size, recordmarker;
	155
f3a75078 RS	156	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	157
763cd6e3	158	size = zdr_getpos(&pdu->zdr);
84004dbf	159
a669857d RS	160	/* for udp we dont queue, we just send it straight away */
a669857d RS	161	if (rpc->is_udp != 0) {
763cd6e3	162	// XXX add a rpc->udp_dest_sock_size and get rid of sys/socket.h and netinet/in.h
a669857d RS	163	if (sendto(rpc->fd, rpc->encodebuf, size, MSG_DONTWAIT, rpc->udp_dest, sizeof(struct sockaddr_in)) < 0) {
	164	rpc_set_error(rpc, "Sendto failed with errno %s", strerror(errno));
	165	rpc_free_pdu(rpc, pdu);
	166	return -1;
	167	}
aec45c62	168	rpc_enqueue(&rpc->waitpdu, pdu);
a669857d RS	169	return 0;
	170	}
	171
84004dbf	172	/* write recordmarker */
763cd6e3	173	zdr_setpos(&pdu->zdr, 0);
84004dbf	174	recordmarker = (size - 4) \| 0x80000000;
763cd6e3	175	zdr_int(&pdu->zdr, &recordmarker);
84004dbf RS	176
	177	pdu->outdata.size = size;
	178	pdu->outdata.data = malloc(pdu->outdata.size);
	179	if (pdu->outdata.data == NULL) {
	180	rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
	181	rpc_free_pdu(rpc, pdu);
	182	return -1;
	183	}
	184
	185	memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
aec45c62	186	rpc_enqueue(&rpc->outqueue, pdu);
84004dbf RS	187
	188	return 0;
	189	}
	190
	191	int rpc_get_pdu_size(char *buf)
	192	{
	193	uint32_t size;
	194
	195	size = ntohl((uint32_t )buf);
	196
84004dbf RS	197	return (size & 0x7fffffff) + 4;
	198	}
	199
763cd6e3	200	static int rpc_process_reply(struct rpc_context rpc, struct rpc_pdu pdu, ZDR *zdr)
84004dbf RS	201	{
	202	struct rpc_msg msg;
	203
f3a75078 RS	204	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	205
ea98629a	206	memset(&msg, 0, sizeof(struct rpc_msg));
aab6538b	207	msg.body.rbody.reply.areply.verf = _null_auth;
763cd6e3 RS	208	if (pdu->zdr_decode_bufsize > 0) {
	209	if (pdu->zdr_decode_buf != NULL) {
	210	free(pdu->zdr_decode_buf);
1b9917b8	211	}
763cd6e3 RS	212	pdu->zdr_decode_buf = malloc(pdu->zdr_decode_bufsize);
763cd6e3 RS	213	if (pdu->zdr_decode_buf == NULL) {
f0cb8042 RS	214	rpc_set_error(rpc, "Failed to allocate memory for "
	215	"zdr_encode_buf in rpc_process_reply");
	216	pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate "
	217	"buffer for decoding of ZDR reply",
	218	pdu->private_data);
84004dbf RS	219	return 0;
84004dbf RS	220	}
763cd6e3	221	memset(pdu->zdr_decode_buf, 0, pdu->zdr_decode_bufsize);
84004dbf	222	}
aab6538b RS	223	msg.body.rbody.reply.areply.reply_data.results.where = pdu->zdr_decode_buf;
aab6538b RS	224	msg.body.rbody.reply.areply.reply_data.results.proc = pdu->zdr_decode_fn;
84004dbf	225
f0cb8042 RS	226	if (zdr_replymsg(rpc, zdr, &msg) == 0) {
	227	rpc_set_error(rpc, "zdr_replymsg failed in rpc_process_reply: "
	228	"%s", rpc_get_error(rpc));
	229	pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server",
	230	pdu->private_data);
763cd6e3 RS	231	if (pdu->zdr_decode_buf != NULL) {
	232	free(pdu->zdr_decode_buf);
	233	pdu->zdr_decode_buf = NULL;
84004dbf RS	234	}
	235	return 0;
	236	}
aab6538b	237	if (msg.body.rbody.stat != MSG_ACCEPTED) {
84004dbf RS	238	pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
	239	return 0;
	240	}
aab6538b	241	switch (msg.body.rbody.reply.areply.stat) {
84004dbf	242	case SUCCESS:
763cd6e3	243	pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->zdr_decode_buf, pdu->private_data);
84004dbf RS	244	break;
	245	case PROG_UNAVAIL:
	246	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
	247	break;
	248	case PROG_MISMATCH:
	249	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
	250	break;
	251	case PROC_UNAVAIL:
	252	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
	253	break;
	254	case GARBAGE_ARGS:
	255	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
	256	break;
	257	case SYSTEM_ERR:
	258	pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
	259	break;
	260	default:
	261	pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
	262	break;
	263	}
	264
	265	return 0;
	266	}
	267
	268	int rpc_process_pdu(struct rpc_context rpc, char buf, int size)
	269	{
aec45c62	270	struct rpc_pdu pdu, prev_pdu;
763cd6e3	271	ZDR zdr;
d678b73e	272	int pos, recordmarker = 0;
b93082da	273	uint32_t xid;
d678b73e	274	char *reasbuf = NULL;
84004dbf	275
f3a75078 RS	276	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	277
763cd6e3	278	memset(&zdr, 0, sizeof(ZDR));
84004dbf	279
763cd6e3	280	zdrmem_create(&zdr, buf, size, ZDR_DECODE);
a669857d	281	if (rpc->is_udp == 0) {
763cd6e3 RS	282	if (zdr_int(&zdr, &recordmarker) == 0) {
	283	rpc_set_error(rpc, "zdr_int reading recordmarker failed");
	284	zdr_destroy(&zdr);
a669857d RS	285	return -1;
a669857d RS	286	}
d678b73e	287	if (!(recordmarker&0x80000000)) {
763cd6e3	288	zdr_destroy(&zdr);
d678b73e RS	289	if (rpc_add_fragment(rpc, buf+4, size-4) != 0) {
	290	rpc_set_error(rpc, "Failed to queue fragment for reassembly.");
	291	return -1;
	292	}
	293	return 0;
	294	}
84004dbf	295	}
d678b73e RS	296
	297	/* reassembly */
	298	if (recordmarker != 0 && rpc->fragments != NULL) {
	299	struct rpc_fragment *fragment;
574095b9	300	uint32_t total = size - 4;
d678b73e RS	301	char *ptr;
d678b73e RS	302
763cd6e3	303	zdr_destroy(&zdr);
d678b73e RS	304	for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
	305	total += fragment->size;
	306	}
	307
	308	reasbuf = malloc(total);
	309	if (reasbuf == NULL) {
	310	rpc_set_error(rpc, "Failed to reassemble PDU");
	311	rpc_free_all_fragments(rpc);
	312	return -1;
	313	}
	314	ptr = reasbuf;
	315	for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
	316	memcpy(ptr, fragment->data, fragment->size);
	317	ptr += fragment->size;
	318	}
	319	memcpy(ptr, buf + 4, size - 4);
763cd6e3	320	zdrmem_create(&zdr, reasbuf, total, ZDR_DECODE);
d678b73e RS	321	rpc_free_all_fragments(rpc);
	322	}
	323
763cd6e3 RS	324	pos = zdr_getpos(&zdr);
	325	if (zdr_int(&zdr, (int *)&xid) == 0) {
	326	rpc_set_error(rpc, "zdr_int reading xid failed");
	327	zdr_destroy(&zdr);
d678b73e RS	328	if (reasbuf != NULL) {
	329	free(reasbuf);
	330	}
84004dbf RS	331	return -1;
84004dbf RS	332	}
763cd6e3	333	zdr_setpos(&zdr, pos);
84004dbf	334
aec45c62 MH	335	/* Linear traverse singly-linked list, but track previous
	336	* entry for optimised removal */
	337	prev_pdu = NULL;
	338	for (pdu=rpc->waitpdu.head; pdu; pdu=pdu->next) {
84004dbf	339	if (pdu->xid != xid) {
aec45c62	340	prev_pdu = pdu;
84004dbf RS	341	continue;
84004dbf RS	342	}
a669857d	343	if (rpc->is_udp == 0 \|\| rpc->is_broadcast == 0) {
aec45c62 MH	344	/* Singly-linked but we track head and tail */
	345	if (pdu == rpc->waitpdu.head)
	346	rpc->waitpdu.head = pdu->next;
	347	if (pdu == rpc->waitpdu.tail)
	348	rpc->waitpdu.tail = prev_pdu;
	349	if (prev_pdu != NULL)
	350	prev_pdu->next = pdu->next;
a669857d	351	}
763cd6e3	352	if (rpc_process_reply(rpc, pdu, &zdr) != 0) {
1896d37b	353	rpc_set_error(rpc, "rpc_procdess_reply failed");
84004dbf	354	}
763cd6e3	355	zdr_destroy(&zdr);
a669857d RS	356	if (rpc->is_udp == 0 \|\| rpc->is_broadcast == 0) {
	357	rpc_free_pdu(rpc, pdu);
	358	}
d678b73e RS	359	if (reasbuf != NULL) {
	360	free(reasbuf);
	361	}
84004dbf RS	362	return 0;
84004dbf RS	363	}
1896d37b	364	rpc_set_error(rpc, "No matching pdu found for xid:%d", xid);
763cd6e3	365	zdr_destroy(&zdr);
d678b73e RS	366	if (reasbuf != NULL) {
	367	free(reasbuf);
	368	}
84004dbf RS	369	return -1;
	370	}
	371