- Extend the nsswitch to support Services, Protocols and Rpc

  databases.
- Make nsswitch support caching.

Submitted by:	Michael Bushkov <bushman__at__rsu.ru>
Sponsored by:	Google Summer of Code 2005

1 files changed, 438 insertions, 0 deletions

diff --git a/lib/libc/net/nscache.c b/lib/libc/net/nscache.c
new file mode 100644
index 0000000..98a4367
--- /dev/null
+++ b/lib/libc/net/nscache.c
@@ -0,0 +1,438 @@
+/*-
+ * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+#include <nsswitch.h>
+#include <stdlib.h>
+#include <string.h>
+#include "un-namespace.h"
+#include "nscachedcli.h"
+#include "nscache.h"
+
+#define NSS_CACHE_KEY_INITIAL_SIZE	(256)
+#define NSS_CACHE_KEY_SIZE_LIMIT	(NSS_CACHE_KEY_INITIAL_SIZE << 4)
+
+#define NSS_CACHE_BUFFER_INITIAL_SIZE	(1024)
+#define NSS_CACHE_BUFFER_SIZE_LIMIT	(NSS_CACHE_BUFFER_INITIAL_SIZE << 8)
+
+#define CACHED_SOCKET_PATH 		"/var/run/cached"
+
+int
+__nss_cache_handler(void *retval, void *mdata, va_list ap)
+{
+	return (NS_UNAVAIL);
+}
+
+int
+__nss_common_cache_read(void *retval, void *mdata, va_list ap)
+{
+	struct cached_connection_params params;
+	cached_connection connection;
+
+	char *buffer;
+	size_t buffer_size, size;
+
+	nss_cache_info const *cache_info;
+	nss_cache_data *cache_data;
+	va_list ap_new;
+	int res;
+
+	cache_data = (nss_cache_data *)mdata;
+	cache_info = cache_data->info;
+
+	memset(&params, 0, sizeof(struct cached_connection_params));
+	params.socket_path = CACHED_SOCKET_PATH;
+
+	cache_data->key = (char *)malloc(NSS_CACHE_KEY_INITIAL_SIZE);
+	memset(cache_data->key, 0, NSS_CACHE_KEY_INITIAL_SIZE);
+	cache_data->key_size = NSS_CACHE_KEY_INITIAL_SIZE;
+	va_copy(ap_new, ap);
+
+	do {
+		size = cache_data->key_size;
+		res = cache_info->id_func(cache_data->key, &size, ap_new,
+		    cache_info->mdata);
+		va_end(ap_new);
+		if (res == NS_RETURN) {
+			if (cache_data->key_size > NSS_CACHE_KEY_SIZE_LIMIT)
+				break;
+
+			cache_data->key_size <<= 1;
+			cache_data->key = realloc(cache_data->key,
+			    cache_data->key_size);
+			memset(cache_data->key, 0, cache_data->key_size);
+			va_copy(ap_new, ap);
+		}
+	} while (res == NS_RETURN);
+
+	if (res != NS_SUCCESS) {
+		free(cache_data->key);
+		cache_data->key = NULL;
+		cache_data->key_size = 0;
+		return (res);
+	} else
+		cache_data->key_size = size;
+
+	buffer_size = NSS_CACHE_BUFFER_INITIAL_SIZE;
+	buffer = (char *)malloc(NSS_CACHE_BUFFER_INITIAL_SIZE);
+	memset(buffer, 0, NSS_CACHE_BUFFER_INITIAL_SIZE);
+
+	do {
+		connection = __open_cached_connection(&params);
+		if (connection == NULL) {
+			res = -1;
+			break;
+		}
+		res = __cached_read(connection, cache_info->entry_name,
+		    cache_data->key, cache_data->key_size, buffer,
+		    &buffer_size);
+		__close_cached_connection(connection);
+		if (res == -2 && buffer_size < NSS_CACHE_BUFFER_SIZE_LIMIT) {
+			buffer = (char *)realloc(buffer, buffer_size);
+			memset(buffer, 0, buffer_size);
+		}
+	} while (res == -2);
+
+	if (res == 0) {
+		if (buffer_size == 0) {
+			free(buffer);
+			free(cache_data->key);
+			cache_data->key = NULL;
+			cache_data->key_size = 0;
+			return (NS_RETURN);
+		}
+
+		va_copy(ap_new, ap);
+		res = cache_info->unmarshal_func(buffer, buffer_size, retval,
+		    ap_new, cache_info->mdata);
+		va_end(ap_new);
+
+		if (res != NS_SUCCESS) {
+			free(buffer);
+			free(cache_data->key);
+			cache_data->key = NULL;
+			cache_data->key_size = 0;
+			return (res);
+		} else
+			res = 0;
+	}
+
+	if (res == 0) {
+		free(cache_data->key);
+		cache_data->key = NULL;
+		cache_data->key_size = 0;
+	}
+
+	free(buffer);
+	return (res == 0 ? NS_SUCCESS : NS_NOTFOUND);
+}
+
+int
+__nss_common_cache_write(void *retval, void *mdata, va_list ap)
+{
+	struct cached_connection_params params;
+	cached_connection connection;
+
+	char *buffer;
+	size_t buffer_size;
+
+	nss_cache_info const *cache_info;
+	nss_cache_data *cache_data;
+	va_list ap_new;
+	int res;
+
+	cache_data = (nss_cache_data *)mdata;
+	cache_info = cache_data->info;
+
+	if (cache_data->key == NULL)
+		return (NS_UNAVAIL);
+
+	memset(&params, 0, sizeof(struct cached_connection_params));
+	params.socket_path = CACHED_SOCKET_PATH;
+
+	connection = __open_cached_connection(&params);
+	if (connection == NULL) {
+		free(cache_data->key);
+		return (NS_UNAVAIL);
+	}
+
+	buffer_size = NSS_CACHE_BUFFER_INITIAL_SIZE;
+	buffer = (char *)malloc(NSS_CACHE_BUFFER_INITIAL_SIZE);
+	memset(buffer, 0, NSS_CACHE_BUFFER_INITIAL_SIZE);
+
+	do {
+		size_t size;
+
+		size = buffer_size;
+		va_copy(ap_new, ap);
+		res = cache_info->marshal_func(buffer, &size, retval, ap_new,
+		    cache_info->mdata);
+		va_end(ap_new);
+
+		if (res == NS_RETURN) {
+			if (buffer_size > NSS_CACHE_BUFFER_SIZE_LIMIT)
+				break;
+
+			buffer_size <<= 1;
+			buffer = (char *)realloc(buffer, buffer_size);
+			memset(buffer, 0, buffer_size);
+		}
+	} while (res == NS_RETURN);
+
+	if (res != NS_SUCCESS) {
+		__close_cached_connection(connection);
+		free(cache_data->key);
+		free(buffer);
+		return (res);
+	}
+
+	res = __cached_write(connection, cache_info->entry_name,
+	    cache_data->key, cache_data->key_size, buffer, buffer_size);
+	__close_cached_connection(connection);
+
+	free(cache_data->key);
+	free(buffer);
+
+	return (res == 0 ? NS_SUCCESS : NS_UNAVAIL);
+}
+
+int
+__nss_common_cache_write_negative(void *mdata)
+{
+	struct cached_connection_params params;
+	cached_connection connection;
+	int res;
+
+	nss_cache_info const *cache_info;
+	nss_cache_data *cache_data;
+
+	cache_data = (nss_cache_data *)mdata;
+	cache_info = cache_data->info;
+
+	if (cache_data->key == NULL)
+		return (NS_UNAVAIL);
+
+	memset(&params, 0, sizeof(struct cached_connection_params));
+	params.socket_path = CACHED_SOCKET_PATH;
+
+	connection = __open_cached_connection(&params);
+	if (connection == NULL) {
+		free(cache_data->key);
+		return (NS_UNAVAIL);
+	}
+
+	res = __cached_write(connection, cache_info->entry_name,
+	    cache_data->key, cache_data->key_size, NULL, 0);
+	__close_cached_connection(connection);
+
+	free(cache_data->key);
+	return (res == 0 ? NS_SUCCESS : NS_UNAVAIL);
+}
+
+int
+__nss_mp_cache_read(void *retval, void *mdata, va_list ap)
+{
+	struct cached_connection_params params;
+	cached_mp_read_session rs;
+
+	char *buffer;
+	size_t buffer_size;
+
+	nss_cache_info const *cache_info;
+	nss_cache_data *cache_data;
+	va_list ap_new;
+	int res;
+
+	cache_data = (nss_cache_data *)mdata;
+	cache_info = cache_data->info;
+
+	if (cache_info->get_mp_ws_func() != INVALID_CACHED_MP_WRITE_SESSION)
+		return (NS_UNAVAIL);
+
+	rs = cache_info->get_mp_rs_func();
+	if (rs == INVALID_CACHED_MP_READ_SESSION) {
+		memset(&params, 0, sizeof(struct cached_connection_params));
+		params.socket_path = CACHED_SOCKET_PATH;
+
+		rs = __open_cached_mp_read_session(&params,
+		    cache_info->entry_name);
+		if (rs == INVALID_CACHED_MP_READ_SESSION)
+			return (NS_UNAVAIL);
+
+		cache_info->set_mp_rs_func(rs);
+	}
+
+	buffer_size = NSS_CACHE_BUFFER_INITIAL_SIZE;
+	buffer = (char *)malloc(NSS_CACHE_BUFFER_INITIAL_SIZE);
+	memset(buffer, 0, NSS_CACHE_BUFFER_INITIAL_SIZE);
+
+	do {
+		res = __cached_mp_read(rs, buffer, &buffer_size);
+		if (res == -2 && buffer_size < NSS_CACHE_BUFFER_SIZE_LIMIT) {
+			buffer = (char *)realloc(buffer, buffer_size);
+			memset(buffer, 0, buffer_size);
+		}
+	} while (res == -2);
+
+	if (res == 0) {
+		va_copy(ap_new, ap);
+		res = cache_info->unmarshal_func(buffer, buffer_size, retval,
+		    ap_new, cache_info->mdata);
+		va_end(ap_new);
+
+		if (res != NS_SUCCESS) {
+			free(buffer);
+			return (res);
+		} else
+			res = 0;
+	} else {
+		free(buffer);
+		__close_cached_mp_read_session(rs);
+		rs = INVALID_CACHED_MP_READ_SESSION;
+		cache_info->set_mp_rs_func(rs);
+		return (res == -1 ? NS_RETURN : NS_UNAVAIL);
+	}
+
+	free(buffer);
+	return (res == 0 ? NS_SUCCESS : NS_NOTFOUND);
+}
+
+int
+__nss_mp_cache_write(void *retval, void *mdata, va_list ap)
+{
+	struct cached_connection_params params;
+	cached_mp_write_session ws;
+
+	char *buffer;
+	size_t buffer_size;
+
+	nss_cache_info const *cache_info;
+	nss_cache_data *cache_data;
+	va_list ap_new;
+	int res;
+
+	cache_data = (nss_cache_data *)mdata;
+	cache_info = cache_data->info;
+
+	ws = cache_info->get_mp_ws_func();
+	if (ws == INVALID_CACHED_MP_WRITE_SESSION) {
+		memset(&params, 0, sizeof(struct cached_connection_params));
+		params.socket_path = CACHED_SOCKET_PATH;
+
+		ws = __open_cached_mp_write_session(&params,
+		    cache_info->entry_name);
+		if (ws == INVALID_CACHED_MP_WRITE_SESSION)
+			return (NS_UNAVAIL);
+
+		cache_info->set_mp_ws_func(ws);
+	}
+
+	buffer_size = NSS_CACHE_BUFFER_INITIAL_SIZE;
+	buffer = (char *)malloc(NSS_CACHE_BUFFER_INITIAL_SIZE);
+	memset(buffer, 0, NSS_CACHE_BUFFER_INITIAL_SIZE);
+
+	do {
+		size_t size;
+
+		size = buffer_size;
+		va_copy(ap_new, ap);
+		res = cache_info->marshal_func(buffer, &size, retval, ap_new,
+		    cache_info->mdata);
+		va_end(ap_new);
+
+		if (res == NS_RETURN) {
+			if (buffer_size > NSS_CACHE_BUFFER_SIZE_LIMIT)
+				break;
+
+			buffer_size <<= 1;
+			buffer = (char *)realloc(buffer, buffer_size);
+			memset(buffer, 0, buffer_size);
+		}
+	} while (res == NS_RETURN);
+
+	if (res != NS_SUCCESS) {
+		free(buffer);
+		return (res);
+	}
+
+	res = __cached_mp_write(ws, buffer, buffer_size);
+
+	free(buffer);
+	return (res == 0 ? NS_SUCCESS : NS_UNAVAIL);
+}
+
+int
+__nss_mp_cache_write_submit(void *retval, void *mdata, va_list ap)
+{
+	cached_mp_write_session ws;
+
+	nss_cache_info const *cache_info;
+	nss_cache_data *cache_data;
+
+	cache_data = (nss_cache_data *)mdata;
+	cache_info = cache_data->info;
+
+	ws = cache_info->get_mp_ws_func();
+	if (ws != INVALID_CACHED_MP_WRITE_SESSION) {
+		__close_cached_mp_write_session(ws);
+		ws = INVALID_CACHED_MP_WRITE_SESSION;
+		cache_info->set_mp_ws_func(ws);
+	}
+	return (NS_UNAVAIL);
+}
+
+int
+__nss_mp_cache_end(void *retval, void *mdata, va_list ap)
+{
+	cached_mp_write_session ws;
+	cached_mp_read_session rs;
+
+	nss_cache_info const *cache_info;
+	nss_cache_data *cache_data;
+
+	cache_data = (nss_cache_data *)mdata;
+	cache_info = cache_data->info;
+
+	ws = cache_info->get_mp_ws_func();
+	if (ws != INVALID_CACHED_MP_WRITE_SESSION) {
+		__abandon_cached_mp_write_session(ws);
+		ws = INVALID_CACHED_MP_WRITE_SESSION;
+		cache_info->set_mp_ws_func(ws);
+	}
+
+	rs = cache_info->get_mp_rs_func();
+	if (rs != INVALID_CACHED_MP_READ_SESSION) {
+		__close_cached_mp_read_session(rs);
+		rs = INVALID_CACHED_MP_READ_SESSION;
+		cache_info->set_mp_rs_func(rs);
+	}
+
+	return (NS_UNAVAIL);
+}