Add a lookip server side UNIX socket processing LOOKUP and DUMP requests

2012-10-24 11:43:34 +02:00
parent d59e6db614
commit 7650dd9a4f
4 changed files with 309 additions and 1 deletions
@@ -0,0 +1,255 @@
+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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 General Public License
+ * for more details.
+ */
+
+#include "lookip_socket.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <daemon.h>
+#include <threading/thread.h>
+#include <processing/jobs/callback_job.h>
+
+#include "lookip_msg.h"
+
+typedef struct private_lookip_socket_t private_lookip_socket_t;
+
+/**
+ * Private data of an lookip_socket_t object.
+ */
+struct private_lookip_socket_t {
+
+	/**
+	 * Public lookip_socket_t interface.
+	 */
+	lookip_socket_t public;
+
+	/**
+	 * lookip
+	 */
+	lookip_listener_t *listener;
+
+	/**
+	 * lookip unix socket file descriptor
+	 */
+	int socket;
+};
+
+/**
+ * Open lookip unix socket
+ */
+static bool open_socket(private_lookip_socket_t *this)
+{
+	struct sockaddr_un addr;
+	mode_t old;
+
+	addr.sun_family = AF_UNIX;
+	strcpy(addr.sun_path, LOOKIP_SOCKET);
+
+	this->socket = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+	if (this->socket == -1)
+	{
+		DBG1(DBG_CFG, "creating lookip socket failed");
+		return FALSE;
+	}
+	unlink(addr.sun_path);
+	old = umask(~(S_IRWXU | S_IRWXG));
+	if (bind(this->socket, (struct sockaddr*)&addr, sizeof(addr)) < 0)
+	{
+		DBG1(DBG_CFG, "binding lookip socket failed: %s", strerror(errno));
+		close(this->socket);
+		return FALSE;
+	}
+	umask(old);
+	if (chown(addr.sun_path, charon->caps->get_uid(charon->caps),
+			  charon->caps->get_gid(charon->caps)) != 0)
+	{
+		DBG1(DBG_CFG, "changing lookip socket permissions failed: %s",
+			 strerror(errno));
+	}
+	if (listen(this->socket, 10) < 0)
+	{
+		DBG1(DBG_CFG, "listening on lookip socket failed: %s", strerror(errno));
+		close(this->socket);
+		unlink(addr.sun_path);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/**
+ * Listener callback data
+ */
+typedef struct {
+	/* FD to write to */
+	int fd;
+	/* message type to send */
+	int type;
+} cb_data_t;
+
+/**
+ * Callback function for listener
+ */
+static bool listener_cb(cb_data_t *data, bool up, host_t *vip,
+						host_t *other, identification_t *id, char *name)
+{
+	lookip_response_t resp = {
+		.type = data->type,
+	};
+
+	snprintf(resp.vip, sizeof(resp.vip), "%H", vip);
+	snprintf(resp.ip, sizeof(resp.ip), "%H", other);
+	snprintf(resp.id, sizeof(resp.id), "%Y", id);
+	snprintf(resp.name, sizeof(resp.name), "%s", name);
+
+	switch (send(data->fd, &resp, sizeof(resp), 0))
+	{
+		case sizeof(resp):
+			return TRUE;
+		case 0:
+			/* client disconnected, adios */
+			return FALSE;
+		default:
+			DBG1(DBG_CFG, "sending lookip response failed: %s", strerror(errno));
+			return FALSE;
+	}
+}
+
+/**
+ * Perform a entry lookup
+ */
+static void query(private_lookip_socket_t *this, int fd, lookip_request_t *req)
+{
+	cb_data_t data = {
+		.fd = fd,
+		.type = LOOKIP_ENTRY,
+	};
+	host_t *vip = NULL;
+
+	if (req)
+	{	/* lookup */
+		req->vip[sizeof(req->vip) - 1] = 0;
+		vip = host_create_from_string(req->vip, 0);
+		if (vip)
+		{
+			this->listener->lookup(this->listener, vip,
+								   (void*)listener_cb, &data);
+			vip->destroy(vip);
+		}
+	}
+	else
+	{	/* dump */
+		this->listener->lookup(this->listener, NULL,
+							   (void*)listener_cb, &data);
+	}
+}
+
+/**
+ * Accept client connections, dispatch
+ */
+static job_requeue_t receive(private_lookip_socket_t *this)
+{
+	struct sockaddr_un addr;
+	int fd, len = sizeof(addr);
+	lookip_request_t req;
+	bool oldstate;
+
+	oldstate = thread_cancelability(TRUE);
+	fd = accept(this->socket, (struct sockaddr*)&addr, &len);
+	thread_cancelability(oldstate);
+
+	if (fd != -1)
+	{
+		while (TRUE)
+		{
+			oldstate = thread_cancelability(TRUE);
+			len = recv(fd, &req, sizeof(req), 0);
+			thread_cancelability(oldstate);
+
+			if (len == sizeof(req))
+			{
+				switch (req.type)
+				{
+					case LOOKIP_LOOKUP:
+						query(this, fd, &req);
+						continue;
+					case LOOKIP_DUMP:
+						query(this, fd, NULL);
+						continue;
+					case LOOKIP_END:
+						break;
+					default:
+						DBG1(DBG_CFG, "received unknown lookip command");
+						break;
+				}
+			}
+			else
+			{
+				if (len != 0)
+				{
+					DBG1(DBG_CFG, "receiving lookip request failed: %s",
+						 strerror(errno));
+				}
+				break;
+			}
+			break;
+		}
+		close(fd);
+	}
+	else
+	{
+		DBG1(DBG_CFG, "accepting lookip connection failed: %s",
+			 strerror(errno));
+	}
+	return JOB_REQUEUE_FAIR;
+}
+
+METHOD(lookip_socket_t, destroy, void,
+	private_lookip_socket_t *this)
+{
+	close(this->socket);
+	free(this);
+}
+
+/**
+ * See header
+ */
+lookip_socket_t *lookip_socket_create(lookip_listener_t *listener)
+{
+	private_lookip_socket_t *this;
+
+	INIT(this,
+		.public = {
+			.destroy = _destroy,
+		},
+		.listener = listener,
+	);
+
+	if (!open_socket(this))
+	{
+		free(this);
+		return NULL;
+	}
+
+	lib->processor->queue_job(lib->processor,
+		(job_t*)callback_job_create_with_prio((callback_job_cb_t)receive, this,
+				NULL, (callback_job_cancel_t)return_false, JOB_PRIO_CRITICAL));
+
+	return &this->public;
+}