- 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, 284 insertions, 0 deletions

diff --git a/usr.sbin/nscd/nscdcli.c b/usr.sbin/nscd/nscdcli.c
new file mode 100644
index 0000000..c78c875
--- /dev/null
+++ b/usr.sbin/nscd/nscdcli.c
@@ -0,0 +1,284 @@
+/*-
+ * 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 <sys/types.h>
+#include <sys/socket.h>
+#include <sys/event.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "debug.h"
+#include "cachedcli.h"
+#include "protocol.h"
+
+#define DEFAULT_CACHED_IO_TIMEOUT	4
+
+static int safe_write(struct cached_connection_ *, const void *, size_t);
+static int safe_read(struct cached_connection_ *, void *, size_t);
+static int send_credentials(struct cached_connection_ *, int);
+
+static int
+safe_write(struct cached_connection_ *connection, const void *data,
+	size_t data_size)
+{
+	struct kevent eventlist;
+	int	nevents;
+	size_t result;
+	ssize_t s_result;
+	struct timespec	timeout;
+
+	if (data_size == 0)
+		return (0);
+
+	timeout.tv_sec = DEFAULT_CACHED_IO_TIMEOUT;
+	timeout.tv_nsec = 0;
+	result = 0;
+	do {
+		nevents = kevent(connection->write_queue, NULL, 0, &eventlist,
+	    		1, &timeout);
+		if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
+			s_result = write(connection->sockfd, data + result,
+				eventlist.data < data_size - result ?
+		    		eventlist.data : data_size - result);
+			if (s_result == -1)
+				return (-1);
+			else
+				result += s_result;
+
+			if (eventlist.flags & EV_EOF)
+				return (result < data_size ? -1 : 0);
+		} else
+			return (-1);
+	} while (result < data_size);
+
+	return (0);
+}
+
+static int
+safe_read(struct cached_connection_ *connection, void *data, size_t data_size)
+{
+	struct kevent eventlist;
+	size_t result;
+	ssize_t s_result;
+	struct timespec timeout;
+	int nevents;
+
+	if (data_size == 0)
+		return (0);
+
+	timeout.tv_sec = DEFAULT_CACHED_IO_TIMEOUT;
+	timeout.tv_nsec = 0;
+	result = 0;
+	do {
+		nevents = kevent(connection->read_queue, NULL, 0, &eventlist, 1,
+			&timeout);
+		if ((nevents == 1) && (eventlist.filter == EVFILT_READ)) {
+			s_result = read(connection->sockfd, data + result,
+			eventlist.data <= data_size - result ? eventlist.data :
+				data_size - result);
+			if (s_result == -1)
+				return (-1);
+			else
+				result += s_result;
+
+			if (eventlist.flags & EV_EOF)
+				return (result < data_size ? -1 : 0);
+		} else
+			return (-1);
+	} while (result < data_size);
+
+	return (0);
+}
+
+static int
+send_credentials(struct cached_connection_ *connection, int type)
+{
+	struct kevent eventlist;
+	int nevents;
+	ssize_t result;
+	int res;
+
+	struct msghdr	cred_hdr;
+	struct iovec	iov;
+
+	struct {
+		struct cmsghdr	hdr;
+		struct cmsgcred	creds;
+	} cmsg;
+
+	TRACE_IN(send_credentials);
+	memset(&cmsg, 0, sizeof(cmsg));
+	cmsg.hdr.cmsg_len = sizeof(cmsg);
+	cmsg.hdr.cmsg_level = SOL_SOCKET;
+	cmsg.hdr.cmsg_type = SCM_CREDS;
+
+	memset(&cred_hdr, 0, sizeof(struct msghdr));
+	cred_hdr.msg_iov = &iov;
+	cred_hdr.msg_iovlen = 1;
+	cred_hdr.msg_control = &cmsg;
+	cred_hdr.msg_controllen = sizeof(cmsg);
+
+	iov.iov_base = &type;
+	iov.iov_len = sizeof(int);
+
+	EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
+		NOTE_LOWAT, sizeof(int), NULL);
+	res = kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
+
+	nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL);
+	if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
+		result = (sendmsg(connection->sockfd, &cred_hdr, 0) == -1) ? -1
+	    		: 0;
+		EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
+			0, 0, NULL);
+		kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
+		TRACE_OUT(send_credentials);
+		return (result);
+	} else {
+		TRACE_OUT(send_credentials);
+		return (-1);
+	}
+}
+
+struct cached_connection_ *
+open_cached_connection__(struct cached_connection_params const *params)
+{
+	struct cached_connection_ *retval;
+	struct kevent eventlist;
+	struct sockaddr_un	client_address;
+	int client_address_len, client_socket;
+	int res;
+
+	TRACE_IN(open_cached_connection);
+	assert(params != NULL);
+
+	client_socket = socket(PF_LOCAL, SOCK_STREAM, 0);
+	client_address.sun_family = PF_LOCAL;
+	strncpy(client_address.sun_path, params->socket_path,
+		sizeof(client_address.sun_path));
+	client_address_len = sizeof(client_address.sun_family) +
+		strlen(client_address.sun_path) + 1;
+
+	res = connect(client_socket, (struct sockaddr *)&client_address,
+		client_address_len);
+	if (res == -1) {
+		close(client_socket);
+		TRACE_OUT(open_cached_connection);
+		return (NULL);
+	}
+	fcntl(client_socket, F_SETFL, O_NONBLOCK);
+
+	retval = malloc(sizeof(struct cached_connection_));
+	assert(retval != NULL);
+	memset(retval, 0, sizeof(struct cached_connection_));
+
+	retval->sockfd = client_socket;
+
+	retval->write_queue = kqueue();
+	assert(retval->write_queue != -1);
+
+	EV_SET(&eventlist, retval->sockfd, EVFILT_WRITE, EV_ADD,
+		0, 0, NULL);
+	res = kevent(retval->write_queue, &eventlist, 1, NULL, 0, NULL);
+
+	retval->read_queue = kqueue();
+	assert(retval->read_queue != -1);
+
+	EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD,
+		0, 0, NULL);
+	res = kevent(retval->read_queue, &eventlist, 1, NULL, 0, NULL);
+
+	TRACE_OUT(open_cached_connection);
+	return (retval);
+}
+
+void
+close_cached_connection__(struct cached_connection_ *connection)
+{
+
+	TRACE_IN(close_cached_connection);
+	assert(connection != NULL);
+
+	close(connection->sockfd);
+	close(connection->read_queue);
+	close(connection->write_queue);
+	free(connection);
+	TRACE_OUT(close_cached_connection);
+}
+
+int
+cached_transform__(struct cached_connection_ *connection,
+	const char *entry_name, int transformation_type)
+{
+	size_t name_size;
+	int error_code;
+	int result;
+
+	TRACE_IN(cached_transform);
+
+	error_code = -1;
+	result = 0;
+	result = send_credentials(connection, CET_TRANSFORM_REQUEST);
+	if (result != 0)
+		goto fin;
+
+	if (entry_name != NULL)
+		name_size = strlen(entry_name);
+	else
+		name_size = 0;
+
+	result = safe_write(connection, &name_size, sizeof(size_t));
+	if (result != 0)
+		goto fin;
+
+	result = safe_write(connection, &transformation_type, sizeof(int));
+	if (result != 0)
+		goto fin;
+
+	if (entry_name != NULL) {
+		result = safe_write(connection, entry_name, name_size);
+		if (result != 0)
+			goto fin;
+	}
+
+	result = safe_read(connection, &error_code, sizeof(int));
+	if (result != 0)
+		error_code = -1;
+
+fin:
+	TRACE_OUT(cached_transform);
+	return (error_code);
+}