From: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Date: Sat, 24 Nov 2012 16:18:54 +0000 (-0800)
Subject: Add an assert to track if we try to use an rpc_context after it has been destroyed
X-Git-Tag: upstream/1.9.6^2~242^2~3
X-Git-Url: https://git.piment-noir.org/?a=commitdiff_plain;h=f3a75078066dd8022e1e52d9cce2256b4fc323d2;p=deb_libnfs.git

Add an assert to track if we try to use an rpc_context after it has been destroyed
---

diff --git a/include/libnfs-private.h b/include/libnfs-private.h
index f0f8e19..d3cd3ec 100644
--- a/include/libnfs-private.h
+++ b/include/libnfs-private.h
@@ -24,7 +24,10 @@ struct rpc_fragment {
 	char *data;
 };
 
+#define RPC_CONTEXT_MAGIC 0xc6e46435
+
 struct rpc_context {
+        uint32_t magic;
 	int fd;
 	int is_connected;
 
diff --git a/lib/init.c b/lib/init.c
index 936cc8b..bbcfb86 100644
--- a/lib/init.c
+++ b/lib/init.c
@@ -24,6 +24,7 @@
 #include <stdarg.h>
 #include <string.h>
 #include <stdlib.h>
+#include <assert.h>
 #include "slist.h"
 #include "libnfs-zdr.h"
 #include "libnfs.h"
@@ -40,6 +41,7 @@ struct rpc_context *rpc_init_context(void)
 	}
 	memset(rpc, 0, sizeof(struct rpc_context));
 
+	rpc->magic = RPC_CONTEXT_MAGIC;
 	rpc->encodebuflen = 65536;
 	rpc->encodebuf = malloc(rpc->encodebuflen);
 	if (rpc->encodebuf == NULL) {
@@ -78,6 +80,8 @@ struct rpc_context *rpc_init_udp_context(void)
 
 void rpc_set_auth(struct rpc_context *rpc, struct AUTH *auth)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (rpc->auth != NULL) {
 		auth_destroy(rpc->auth);
 	}
@@ -89,6 +93,8 @@ void rpc_set_error(struct rpc_context *rpc, char *error_string, ...)
 {
         va_list ap;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (rpc->error_string != NULL) {
 		free(rpc->error_string);
 	}
@@ -100,6 +106,8 @@ void rpc_set_error(struct rpc_context *rpc, char *error_string, ...)
 
 char *rpc_get_error(struct rpc_context *rpc)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	return rpc->error_string;
 }
 
@@ -107,6 +115,8 @@ void rpc_error_all_pdus(struct rpc_context *rpc, char *error)
 {
 	struct rpc_pdu *pdu;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	while((pdu = rpc->outqueue) != NULL) {
 		pdu->cb(rpc, RPC_STATUS_ERROR, error, pdu->private_data);
 		SLIST_REMOVE(&rpc->outqueue, pdu);
@@ -129,6 +139,8 @@ static void rpc_free_fragment(struct rpc_fragment *fragment)
 
 void rpc_free_all_fragments(struct rpc_context *rpc)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	while (rpc->fragments != NULL) {
 	      struct rpc_fragment *fragment = rpc->fragments;
 
@@ -141,6 +153,8 @@ int rpc_add_fragment(struct rpc_context *rpc, char *data, uint64_t size)
 {
 	struct rpc_fragment *fragment;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	fragment = malloc(sizeof(struct rpc_fragment));
 	if (fragment == NULL) {
 		return -1;
@@ -162,6 +176,8 @@ void rpc_destroy_context(struct rpc_context *rpc)
 {
 	struct rpc_pdu *pdu;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	while((pdu = rpc->outqueue) != NULL) {
 		pdu->cb(rpc, RPC_STATUS_CANCEL, NULL, pdu->private_data);
 		SLIST_REMOVE(&rpc->outqueue, pdu);
@@ -201,6 +217,7 @@ void rpc_destroy_context(struct rpc_context *rpc)
 		rpc->udp_dest = NULL;
 	}
 
+	rpc->magic = 0;
 	free(rpc);
 }
 
diff --git a/lib/libnfs-sync.c b/lib/libnfs-sync.c
index 82578f1..4e671cb 100644
--- a/lib/libnfs-sync.c
+++ b/lib/libnfs-sync.c
@@ -38,6 +38,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <assert.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -67,6 +68,8 @@ static void wait_for_reply(struct rpc_context *rpc, struct sync_cb_data *cb_data
 {
 	struct pollfd pfd;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	while (!cb_data->is_finished) {
 
 		pfd.fd = rpc_get_fd(rpc);
@@ -135,6 +138,8 @@ int nfs_mount(struct nfs_context *nfs, const char *server, const char *export)
 	struct sync_cb_data cb_data;
 	struct rpc_context *rpc = nfs_get_rpc_context(nfs);
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	cb_data.is_finished = 0;
 
 	if (nfs_mount_async(nfs, server, export, mount_cb, &cb_data) != 0) {
@@ -1149,6 +1154,8 @@ void mount_getexports_cb(struct rpc_context *mount_context, int status, void *da
 	struct sync_cb_data *cb_data = private_data;
 	exports export;
 
+	assert(mount_context->magic == RPC_CONTEXT_MAGIC);
+
 	cb_data->is_finished = 1;
 	cb_data->status = status;
 	cb_data->return_data = NULL;
@@ -1230,6 +1237,8 @@ void callit_cb(struct rpc_context *rpc, int status, void *data _U_, void *privat
 	char hostdd[16];
 	struct nfs_server_list *srvr;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_CANCEL) {
 		return;
 	}
@@ -1283,6 +1292,8 @@ static int send_nfsd_probes(struct rpc_context *rpc, INTERFACE_INFO *InterfaceLi
 {
   int i=0;
 
+  assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
   for(i = 0; i < numIfs; i++) 
   {
     SOCKADDR *pAddress;
@@ -1413,6 +1424,8 @@ static int send_nfsd_probes(struct rpc_context *rpc, struct ifconf *ifc, struct
 {
 	char *ptr;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	for (ptr =(char *)(ifc->ifc_buf); ptr < (char *)(ifc->ifc_buf) + ifc->ifc_len; ) {
 		struct ifreq *ifr;
 		char bcdd[16];
diff --git a/lib/libnfs.c b/lib/libnfs.c
index c7c9f48..e68468b 100644
--- a/lib/libnfs.c
+++ b/lib/libnfs.c
@@ -33,6 +33,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
+#include <assert.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -218,11 +219,13 @@ void free_nfs_cb_data(struct nfs_cb_data *data)
 
 
 
-static void nfs_mount_10_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_mount_10_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -244,6 +247,8 @@ static void nfs_mount_9_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_context *nfs = data->nfs;
 	FSINFO3res *res = command_data;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -270,6 +275,8 @@ static void nfs_mount_8_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -294,6 +301,8 @@ static void nfs_mount_7_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	/* Dont want any more callbacks even if the socket is closed */
 	rpc->connect_cb = NULL;
 
@@ -322,6 +331,8 @@ static void nfs_mount_6_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_context *nfs = data->nfs;
 	mountres3 *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -367,6 +378,8 @@ static void nfs_mount_5_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -390,6 +403,8 @@ static void nfs_mount_4_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	/* Dont want any more callbacks even if the socket is closed */
 	rpc->connect_cb = NULL;
 
@@ -417,6 +432,8 @@ static void nfs_mount_3_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_context *nfs = data->nfs;
 	uint32_t mount_port;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {	
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -450,6 +467,8 @@ static void nfs_mount_2_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -473,6 +492,8 @@ static void nfs_mount_1_cb(struct rpc_context *rpc, int status, void *command_da
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	/* Dont want any more callbacks even if the socket is closed */
 	rpc->connect_cb = NULL;
 
@@ -537,12 +558,14 @@ int nfs_mount_async(struct nfs_context *nfs, const char *server, const char *exp
  * Functions to first look up a path, component by component, and then finally call a specific function once
  * the filehandle for the final component is found.
  */
-static void nfs_lookup_path_1_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_lookup_path_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	LOOKUP3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -656,13 +679,15 @@ static int nfs_lookuppath_async(struct nfs_context *nfs, const char *path, nfs_c
 /*
  * Async stat()
  */
-static void nfs_stat_1_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_stat_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	GETATTR3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	struct stat st;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -736,7 +761,7 @@ int nfs_stat_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *p
 /*
  * Async open()
  */
-static void nfs_open_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_open_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	ACCESS3res *res;
 	struct nfs_cb_data *data = private_data;
@@ -744,6 +769,8 @@ static void nfs_open_cb(struct rpc_context *rpc _U_, int status, void *command_d
 	struct nfsfh *nfsfh;
 	unsigned int nfsmode = 0;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -849,12 +876,14 @@ int nfs_open_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb c
 /*
  * Async pread()
  */
-static void nfs_pread_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_pread_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	READ3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -879,13 +908,15 @@ static void nfs_pread_cb(struct rpc_context *rpc _U_, int status, void *command_
 	free_nfs_cb_data(data);
 }
 
-static void nfs_pread_mcb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_pread_mcb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_mcb_data *mdata = private_data;
 	struct nfs_cb_data *data = mdata->data;
 	struct nfs_context *nfs = data->nfs;
 	READ3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	data->num_calls--;
 
 	if (status == RPC_STATUS_ERROR) {
@@ -1026,12 +1057,14 @@ int nfs_read_async(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t count,
 /*
  * Async pwrite()
  */
-static void nfs_pwrite_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_pwrite_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	WRITE3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -1056,13 +1089,15 @@ static void nfs_pwrite_cb(struct rpc_context *rpc _U_, int status, void *command
 	free_nfs_cb_data(data);
 }
 
-static void nfs_pwrite_mcb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_pwrite_mcb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_mcb_data *mdata = private_data;
 	struct nfs_cb_data *data = mdata->data;
 	struct nfs_context *nfs = data->nfs;
 	WRITE3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	data->num_calls--;
 
 	if (status == RPC_STATUS_ERROR) {
@@ -1244,12 +1279,14 @@ int nfs_fstat_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, voi
 /*
  * Async fsync()
  */
-static void nfs_fsync_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_fsync_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	COMMIT3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -1302,12 +1339,14 @@ int nfs_fsync_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, voi
 /*
  * Async ftruncate()
  */
-static void nfs_ftruncate_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_ftruncate_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	SETATTR3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -1403,13 +1442,15 @@ int nfs_truncate_async(struct nfs_context *nfs, const char *path, uint64_t lengt
 /*
  * Async mkdir()
  */
-static void nfs_mkdir_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_mkdir_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	MKDIR3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	char *str = data->continue_data;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	str = &str[strlen(str) + 1];
 
 	if (status == RPC_STATUS_ERROR) {
@@ -1492,13 +1533,15 @@ int nfs_mkdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *
 /*
  * Async rmdir()
  */
-static void nfs_rmdir_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_rmdir_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	RMDIR3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	char *str = data->continue_data;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	str = &str[strlen(str) + 1];
 
 	if (status == RPC_STATUS_ERROR) {
@@ -1572,7 +1615,7 @@ int nfs_rmdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *
 /*
  * Async creat()
  */
-static void nfs_create_2_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_create_2_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	LOOKUP3res *res;
 	struct nfs_cb_data *data = private_data;
@@ -1580,6 +1623,8 @@ static void nfs_create_2_cb(struct rpc_context *rpc _U_, int status, void *comma
 	struct nfsfh *nfsfh;
 	char *str = data->continue_data;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -1620,13 +1665,15 @@ static void nfs_create_2_cb(struct rpc_context *rpc _U_, int status, void *comma
 
 
 
-static void nfs_creat_1_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_creat_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	CREATE3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	char *str = data->continue_data;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -1714,13 +1761,15 @@ int nfs_creat_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb
 /*
  * Async unlink()
  */
-static void nfs_unlink_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_unlink_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	REMOVE3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	char *str = data->continue_data;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	str = &str[strlen(str) + 1];
 
 	if (status == RPC_STATUS_ERROR) {
@@ -1807,13 +1856,15 @@ static void free_mknod_cb_data(void *ptr)
 	free(data);
 }
 
-static void nfs_mknod_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_mknod_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	MKNOD3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	char *str = data->continue_data;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	str = &str[strlen(str) + 1];
 
 	if (status == RPC_STATUS_ERROR) {
@@ -1911,7 +1962,7 @@ struct rdpe_lookup_cb_data {
 };
 
 /* Workaround for servers lacking READDIRPLUS, use READDIR instead and a GETATTR-loop */
-static void nfs_opendir3_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_opendir3_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	LOOKUP3res *res = command_data;
 	struct rdpe_lookup_cb_data *rdpe_lookup_cb_data = private_data;
@@ -1921,6 +1972,8 @@ static void nfs_opendir3_cb(struct rpc_context *rpc _U_, int status, void *comma
 	struct nfs_context *nfs = data->nfs;
 	struct nfsdirent *nfsdirent = rdpe_lookup_cb_data->nfsdirent;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	free(rdpe_lookup_cb_data);
 
 	rdpe_cb_data->getattrcount--;
@@ -1965,7 +2018,7 @@ static void nfs_opendir3_cb(struct rpc_context *rpc _U_, int status, void *comma
 	}
 }
 
-static void nfs_opendir2_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_opendir2_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	READDIR3res *res = command_data;
 	struct nfs_cb_data *data = private_data;
@@ -1976,6 +2029,8 @@ static void nfs_opendir2_cb(struct rpc_context *rpc _U_, int status, void *comma
 	uint64_t cookie;
 	struct rdpe_cb_data *rdpe_cb_data;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		nfs_free_nfsdir(nfsdir);
@@ -2080,7 +2135,7 @@ static void nfs_opendir2_cb(struct rpc_context *rpc _U_, int status, void *comma
 }
 
 
-static void nfs_opendir_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_opendir_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	READDIRPLUS3res *res = command_data;
 	struct nfs_cb_data *data = private_data;
@@ -2089,6 +2144,7 @@ static void nfs_opendir_cb(struct rpc_context *rpc _U_, int status, void *comman
 	struct entryplus3 *entry;
 	uint64_t cookie;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
 
 	if (status == RPC_STATUS_ERROR || (status == RPC_STATUS_SUCCESS && res->status == NFS3ERR_NOTSUPP) ){
 		cookieverf3 cv;
@@ -2250,12 +2306,14 @@ struct lseek_cb_data {
        void *private_data;
 };
 
-static void nfs_lseek_1_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_lseek_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	GETATTR3res *res;
 	struct lseek_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free(data);
@@ -2321,13 +2379,15 @@ int nfs_lseek_async(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t offse
 /*
  * Async statvfs()
  */
-static void nfs_statvfs_1_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_statvfs_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	FSSTAT3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	struct statvfs svfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -2390,12 +2450,14 @@ int nfs_statvfs_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void
 /*
  * Async readlink()
  */
-static void nfs_readlink_1_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_readlink_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	READLINK3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -2452,12 +2514,14 @@ int nfs_readlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb, voi
 /*
  * Async chmod()
  */
-static void nfs_chmod_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_chmod_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	SETATTR3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -2550,12 +2614,14 @@ int nfs_fchmod_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int mode, nfs
 /*
  * Async chown()
  */
-static void nfs_chown_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_chown_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	SETATTR3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -2686,12 +2752,14 @@ int nfs_fchown_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int uid, int
 /*
  * Async utimes()
  */
-static void nfs_utimes_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_utimes_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	SETATTR3res *res;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -2802,13 +2870,15 @@ int nfs_utime_async(struct nfs_context *nfs, const char *path, struct utimbuf *t
 /*
  * Async access()
  */
-static void nfs_access_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_access_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	ACCESS3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	unsigned int nfsmode = 0;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -2915,13 +2985,15 @@ static void free_nfs_symlink_data(void *mem)
 	free(data);
 }
 
-static void nfs_symlink_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_symlink_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	SYMLINK3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	struct nfs_symlink_data *symlink_data = data->continue_data;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -3050,13 +3122,15 @@ static void free_nfs_rename_data(void *mem)
 	free(data);
 }
 
-static void nfs_rename_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_rename_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	RENAME3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	struct nfs_rename_data *rename_data = data->continue_data;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -3206,13 +3280,15 @@ static void free_nfs_link_data(void *mem)
 	free(data);
 }
 
-static void nfs_link_cb(struct rpc_context *rpc _U_, int status, void *command_data, void *private_data)
+static void nfs_link_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
 {
 	LINK3res *res;
 	struct nfs_cb_data *data = private_data;
 	struct nfs_context *nfs = data->nfs;
 	struct nfs_link_data *link_data = data->continue_data;
 	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(-EFAULT, nfs, command_data, data->private_data);
 		free_nfs_cb_data(data);
@@ -3387,7 +3463,9 @@ static void mount_export_5_cb(struct rpc_context *rpc, int status, void *command
 {
 	struct mount_cb_data *data = private_data;
 
-	if (status == RPC_STATUS_ERROR) {	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	if (status == RPC_STATUS_ERROR) {
 		data->cb(rpc, -EFAULT, command_data, data->private_data);
 		free_mount_cb_data(data);
 		return;
@@ -3409,6 +3487,8 @@ static void mount_export_4_cb(struct rpc_context *rpc, int status, void *command
 {
 	struct mount_cb_data *data = private_data;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	/* Dont want any more callbacks even if the socket is closed */
 	rpc->connect_cb = NULL;
 
@@ -3435,7 +3515,9 @@ static void mount_export_3_cb(struct rpc_context *rpc, int status, void *command
 	struct mount_cb_data *data = private_data;
 	uint32_t mount_port;
 
-	if (status == RPC_STATUS_ERROR) {	
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	if (status == RPC_STATUS_ERROR) {
 		data->cb(rpc, -EFAULT, command_data, data->private_data);
 		free_mount_cb_data(data);
 		return;
@@ -3466,6 +3548,8 @@ static void mount_export_2_cb(struct rpc_context *rpc, int status, void *command
 {
 	struct mount_cb_data *data = private_data;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status == RPC_STATUS_ERROR) {
 		data->cb(rpc, -EFAULT, command_data, data->private_data);
 		free_mount_cb_data(data);
@@ -3488,6 +3572,8 @@ static void mount_export_1_cb(struct rpc_context *rpc, int status, void *command
 {
 	struct mount_cb_data *data = private_data;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	/* Dont want any more callbacks even if the socket is closed */
 	rpc->connect_cb = NULL;
 
@@ -3513,6 +3599,8 @@ int mount_getexports_async(struct rpc_context *rpc, const char *server, rpc_cb c
 {
 	struct mount_cb_data *data;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	data = malloc(sizeof(struct mount_cb_data));
 	if (data == NULL) {
 		return -1;
@@ -3535,6 +3623,7 @@ int mount_getexports_async(struct rpc_context *rpc, const char *server, rpc_cb c
 
 struct rpc_context *nfs_get_rpc_context(struct nfs_context *nfs)
 {
+	assert(nfs->rpc->magic == RPC_CONTEXT_MAGIC);
 	return nfs->rpc;
 }
 
diff --git a/lib/pdu.c b/lib/pdu.c
index 597b44c..7dc1ee3 100644
--- a/lib/pdu.c
+++ b/lib/pdu.c
@@ -28,6 +28,7 @@
 #include <string.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#include <assert.h>
 #include <errno.h>
 #include "slist.h"
 #include "libnfs-zdr.h"
@@ -40,9 +41,7 @@ struct rpc_pdu *rpc_allocate_pdu(struct rpc_context *rpc, int program, int versi
 	struct rpc_pdu *pdu;
 	struct rpc_msg msg;
 
-	if (rpc == NULL) {
-		return NULL;
-	}
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
 
 	pdu = malloc(sizeof(struct rpc_pdu));
 	if (pdu == NULL) {
@@ -81,8 +80,10 @@ struct rpc_pdu *rpc_allocate_pdu(struct rpc_context *rpc, int program, int versi
 	return pdu;
 }
 
-void rpc_free_pdu(struct rpc_context *rpc _U_, struct rpc_pdu *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;
@@ -104,6 +105,8 @@ 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 */
@@ -150,6 +153,8 @@ static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, ZDR *
 {
 	struct rpc_msg msg;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	memset(&msg, 0, sizeof(struct rpc_msg));
 	msg.acpted_rply.ar_verf = _null_auth;
 	if (pdu->zdr_decode_bufsize > 0) {
@@ -215,6 +220,8 @@ int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size)
 	unsigned int xid;
 	char *reasbuf = NULL;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	memset(&zdr, 0, sizeof(ZDR));
 
 	zdrmem_create(&zdr, buf, size, ZDR_DECODE);
diff --git a/lib/socket.c b/lib/socket.c
index 32c0945..1ba846a 100644
--- a/lib/socket.c
+++ b/lib/socket.c
@@ -30,6 +30,7 @@
 #endif
 #include <stdio.h>
 #include <stdlib.h>
+#include <assert.h>
 #include <fcntl.h>
 #include <string.h>
 #include <errno.h>
@@ -69,12 +70,18 @@ static void set_nonblocking(int fd)
 
 int rpc_get_fd(struct rpc_context *rpc)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	return rpc->fd;
 }
 
 int rpc_which_events(struct rpc_context *rpc)
 {
-	int events = rpc->is_connected ? POLLIN : POLLOUT;
+	int events;
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	events = rpc->is_connected ? POLLIN : POLLOUT;
 
 	if (rpc->is_udp != 0) {
 		/* for udp sockets we only wait for pollin */
@@ -91,9 +98,8 @@ static int rpc_write_to_socket(struct rpc_context *rpc)
 {
 	int32_t count;
 
-	if (rpc == NULL) {
-		return -1;
-	}
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (rpc->fd == -1) {
 		rpc_set_error(rpc, "trying to write but not connected");
 		return -1;
@@ -135,6 +141,8 @@ static int rpc_read_from_socket(struct rpc_context *rpc)
 	int pdu_size;
 	int32_t count;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 #if defined(WIN32)
 	if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
 #else
@@ -257,6 +265,8 @@ static int rpc_read_from_socket(struct rpc_context *rpc)
 
 int rpc_service(struct rpc_context *rpc, int revents)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (revents & POLLERR) {
 #ifdef WIN32
 		char err = 0;
@@ -335,11 +345,15 @@ int rpc_service(struct rpc_context *rpc, int revents)
 
 void rpc_set_autoreconnect(struct rpc_context *rpc)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	rpc->auto_reconnect = 1;
 }
 
 void rpc_unset_autoreconnect(struct rpc_context *rpc)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	rpc->auto_reconnect = 0;
 }
 
@@ -347,6 +361,8 @@ static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_s
 {
 	int socksize;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	switch (s->ss_family) {
 	case AF_INET:
 		socksize = sizeof(struct sockaddr_in);
@@ -423,6 +439,8 @@ int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc
 {
 	struct sockaddr_in *sin = (struct sockaddr_in *)&rpc->s;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (rpc->fd != -1) {
 		rpc_set_error(rpc, "Trying to connect while already connected");
 		return -1;
@@ -463,6 +481,8 @@ int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc
 
 int rpc_disconnect(struct rpc_context *rpc, char *error)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	rpc_unset_autoreconnect(rpc);
 
 	if (rpc->fd != -1) {
@@ -483,6 +503,8 @@ int rpc_disconnect(struct rpc_context *rpc, char *error)
 
 static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (status != RPC_STATUS_SUCCESS) {
 		rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 		return;
@@ -497,6 +519,8 @@ static int rpc_reconnect_requeue(struct rpc_context *rpc)
 {
 	struct rpc_pdu *pdu;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (rpc->fd != -1) {
 #if defined(WIN32)
 		closesocket(rpc->fd);
@@ -536,6 +560,8 @@ int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 	struct addrinfo *ai = NULL;
 	char service[6];
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (rpc->is_udp == 0) {
 		rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
 		return -1;
@@ -579,6 +605,8 @@ int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int i
 	struct addrinfo *ai = NULL;
 	char service[6];
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (rpc->is_udp == 0) {
 		rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 		return -1;
@@ -612,6 +640,8 @@ int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int i
 
 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	return (struct sockaddr *)&rpc->udp_src;
 }
 
@@ -620,6 +650,8 @@ int rpc_queue_length(struct rpc_context *rpc)
 	int i=0;
 	struct rpc_pdu *pdu;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
 		i++;
 	}