From 7a74bdc8d1b0b32c35dc83e130f687a52dfda1e8 Mon Sep 17 00:00:00 2001
From: Jeremy Kerr <jk@ozlabs.org>
Date: Tue, 13 Oct 2015 09:17:21 +0800
Subject: [PATCH] plugins: Add a backend for the OpenBMC dbus interface

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

Includes the following commits from the following authors

plugins/dbus: Split netfn from lun, and ccode from data

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

plugins/dbus: fix missing semicolon

Reported-by: Chris Austen <austenc@us.ibm.com>

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

plugins/dbus: Fix ccode response

We need to copy it in from the dbus reply.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

plugins/dbus: Use default dbus connection

... so we'll use the system bus if run as UID 0.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

if no interface is specified, use the dbus interface by default

This is a patch that should only be on openbmc, not sent upstream
because the dbus interface is really only an openbmc thing.

Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
---
 configure.ac                 |  19 ++++
 src/plugins/Makefile.am      |   4 +-
 src/plugins/dbus/Makefile.am |  41 ++++++++
 src/plugins/dbus/dbus.c      | 199 +++++++++++++++++++++++++++++++++++
 src/plugins/ipmi_intf.c      |   6 ++
 5 files changed, 267 insertions(+), 2 deletions(-)
 create mode 100644 src/plugins/dbus/Makefile.am
 create mode 100644 src/plugins/dbus/dbus.c

diff --git a/configure.ac b/configure.ac
index f2fe1f3..81cc925 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,6 +60,7 @@ xenable_all_options=yes
 xenable_intf_bmc=no
 xenable_intf_dummy=no
 xenable_intf_imb=yes
+xenable_intf_dbus=yes
 xenable_intf_lipmi=yes
 xenable_intf_open=yes
 #xenable_intf_serial=yes
@@ -222,6 +223,22 @@ if test "x$xenable_intf_usb" = "xyes"; then
 	IPMITOOL_INTF_LIB="$IPMITOOL_INTF_LIB usb/libintf_usb.la"
 fi
 
+dnl enable IPMI dbus interface
+AC_ARG_ENABLE([intf-dbus],
+	[AC_HELP_STRING([--enable-intf-dbus],
+			[enable IPMI dbus interface [default=yes]])],
+		[xenable_intf_dbus=$enableval],
+		[xenable_intf_dbus=yes])
+if test "x$xenable_intf_dbus" = "xstatic" || test "x$xenable_intf_dbus" = "xplugin"; then
+   xenable_intf_dbus=yes
+fi
+if test "x$xenable_intf_dbus" = "xyes"; then
+	AC_DEFINE(IPMI_INTF_DBUS, [1], [Define to 1 to enable dbus interface.])
+	AC_SUBST(INTF_DBUS, [dbus])
+	AC_SUBST(INTF_DBUS_LIB, [libintf_dbus.la])
+	IPMITOOL_INTF_LIB="$IPMITOOL_INTF_LIB dbus/libintf_dbus.la"
+fi
+
 dnl enable IPMIv2.0 RMCP+ LAN interface
 AC_ARG_ENABLE([intf-lanplus],
 	[AC_HELP_STRING([--enable-intf-lanplus],
@@ -664,6 +681,7 @@ AC_CONFIG_FILES([Makefile
 		src/plugins/imb/Makefile
 		src/plugins/bmc/Makefile
 		src/plugins/usb/Makefile
+		src/plugins/dbus/Makefile
 		src/plugins/lipmi/Makefile
 		src/plugins/serial/Makefile
 		src/plugins/dummy/Makefile])
@@ -681,6 +699,7 @@ AC_MSG_RESULT([  free    : $xenable_intf_free])
 AC_MSG_RESULT([  imb     : $xenable_intf_imb])
 AC_MSG_RESULT([  bmc     : $xenable_intf_bmc])
 AC_MSG_RESULT([  usb     : $xenable_intf_usb])
+AC_MSG_RESULT([  dbus    : $xenable_intf_dbus])
 AC_MSG_RESULT([  lipmi   : $xenable_intf_lipmi])
 AC_MSG_RESULT([  serial  : $xenable_intf_serial])
 AC_MSG_RESULT([  dummy   : $xenable_intf_dummy])
diff --git a/src/plugins/Makefile.am b/src/plugins/Makefile.am
index 7ad8173..c0b0b29 100644
--- a/src/plugins/Makefile.am
+++ b/src/plugins/Makefile.am
@@ -32,8 +32,8 @@ MAINTAINERCLEANFILES		= Makefile.in
 
 AM_CPPFLAGS			= -I$(top_srcdir)/include
 
-SUBDIRS				= @INTF_LAN@ @INTF_LANPLUS@ @INTF_OPEN@ @INTF_LIPMI@ @INTF_IMB@ @INTF_BMC@ @INTF_FREE@ @INTF_SERIAL@ @INTF_DUMMY@ @INTF_USB@
-DIST_SUBDIRS			= lan lanplus open lipmi imb bmc free serial dummy usb
+SUBDIRS				= @INTF_LAN@ @INTF_LANPLUS@ @INTF_OPEN@ @INTF_LIPMI@ @INTF_IMB@ @INTF_BMC@ @INTF_FREE@ @INTF_SERIAL@ @INTF_DUMMY@ @INTF_USB@ @INTF_DBUS@
+DIST_SUBDIRS			= lan lanplus open lipmi imb bmc free serial dummy usb dbus
 
 noinst_LTLIBRARIES		= libintf.la
 libintf_la_SOURCES		= ipmi_intf.c
diff --git a/src/plugins/dbus/Makefile.am b/src/plugins/dbus/Makefile.am
new file mode 100644
index 0000000..3e92113
--- /dev/null
+++ b/src/plugins/dbus/Makefile.am
@@ -0,0 +1,41 @@
+ #
+ # Copyright (c) 2015 IBM Corporation
+ # 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.
+ #
+ # 3. Neither the name of the copyright holder nor the names of its contributors
+ #    may be used to endorse or promote products derived from this software
+ #    without specific prior written permission.
+ #
+ # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ #
+
+MAINTAINERCLEANFILES	= Makefile.in
+
+INCLUDES		= -I$(top_srcdir)/include
+
+EXTRA_LTLIBRARIES	= libintf_dbus.la
+noinst_LTLIBRARIES	= @INTF_DBUS_LIB@
+libintf_dbus_la_LDFLAGS	= -lsystemd
+libintf_dbus_la_LIBADD	= $(top_builddir)/lib/libipmitool.la
+libintf_dbus_la_SOURCES	= dbus.c
+
diff --git a/src/plugins/dbus/dbus.c b/src/plugins/dbus/dbus.c
new file mode 100644
index 0000000..c20545f
--- /dev/null
+++ b/src/plugins/dbus/dbus.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright (c) 2015 IBM Corporation
+ * 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.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ */
+
+#define _BSD_SOURCE
+
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdbool.h>
+
+#include <systemd/sd-bus.h>
+#include <systemd/sd-bus-vtable.h>
+
+#include <ipmitool/log.h>
+#include <ipmitool/ipmi.h>
+#include <ipmitool/ipmi_intf.h>
+
+static sd_bus *bus;
+static uint8_t seq;
+static struct ipmi_rs rsp;
+static bool reply_received;
+
+static const char *bus_name = "org.openbmc.HostIpmi.ipmitool";
+static const char *object_path = "/org/openbmc/HostIpmi/ipmitool";
+static const char *interface = "org.openbmc.HostIpmi";
+
+static struct ipmi_rs *ipmi_dbus_sendrecv(struct ipmi_intf *intf,
+		struct ipmi_rq *req)
+{
+	sd_bus_message *msg;
+	int rc;
+
+	(void)intf;
+
+	rsp.ccode = 0xff;
+
+	rc = sd_bus_message_new_signal(bus, &msg, object_path,
+			interface, "ReceivedMessage");
+	if (rc < 0) {
+		lprintf(LOG_ERR, "%s: failed to create message: %s\n",
+				__func__, strerror(-rc));
+		goto out;
+	}
+
+	rc = sd_bus_message_append(msg, "yyyy",
+			++seq,
+			req->msg.netfn,
+			req->msg.lun,
+			req->msg.cmd);
+	if (rc < 0) {
+		lprintf(LOG_ERR, "%s: failed to init bytes\n", __func__);
+		goto out_free;
+	}
+
+	rc = sd_bus_message_append_array(msg, 'y', req->msg.data,
+			req->msg.data_len);
+	if (rc < 0) {
+		lprintf(LOG_ERR, "%s: failed to init body\n", __func__);
+		goto out_free;
+	}
+
+	rc = sd_bus_send(bus, msg, NULL);
+	if (rc < 0) {
+		lprintf(LOG_ERR, "%s: failed to send dbus message\n",
+				__func__);
+		goto out_free;
+	}
+
+	for (reply_received = false; !reply_received;) {
+		rc = sd_bus_wait(bus, -1);
+		sd_bus_process(bus, NULL);
+	}
+
+out_free:
+	sd_bus_message_unref(msg);
+out:
+	return &rsp;
+}
+
+static int ipmi_dbus_method_send_message(sd_bus_message *msg, void *userdata,
+		sd_bus_error *error)
+{
+	uint8_t recv_seq, recv_netfn, recv_lun, recv_cmd, recv_cc;
+	const void *data;
+	size_t n;
+	int rc;
+
+	(void)userdata;
+	(void)error;
+
+	rc = sd_bus_message_read(msg, "yyyyy", &recv_seq, &recv_netfn,
+			&recv_lun, &recv_cmd, &recv_cc);
+	if (rc < 0) {
+		lprintf(LOG_ERR, "%s: failed to read reply\n", __func__);
+		goto out;
+	}
+
+	rc = sd_bus_message_read_array(msg, 'y', &data, &n);
+	if (rc < 0) {
+		lprintf(LOG_ERR, "%s: failed to read reply data\n", __func__);
+		goto out;
+	}
+
+	if (n > sizeof(rsp.data)) {
+		lprintf(LOG_ERR, "%s: data too long!\n", __func__);
+		goto out;
+	}
+
+	if (recv_seq == seq) {
+		rsp.ccode = recv_cc;
+		rsp.data_len = n;
+		memcpy(rsp.data, data, rsp.data_len);
+		reply_received = true;
+	}
+
+out:
+	sd_bus_reply_method_return(msg, "x", 0);
+	return 0;
+}
+
+static const sd_bus_vtable dbus_vtable[] = {
+	SD_BUS_VTABLE_START(0),
+	SD_BUS_SIGNAL("ReceivedMessage", "yyyyay", 0),
+	SD_BUS_METHOD("sendMessage", "yyyyyay", "x",
+			ipmi_dbus_method_send_message,
+			SD_BUS_VTABLE_UNPRIVILEGED),
+	SD_BUS_VTABLE_END
+};
+
+static int ipmi_dbus_setup(struct ipmi_intf *intf)
+{
+	const char *name;
+	int rc;
+
+	rc = sd_bus_default(&bus);
+	if (rc < 0) {
+		lprintf(LOG_ERR, "Can't connect to session bus: %s\n",
+				strerror(-rc));
+		return -1;
+	}
+
+	sd_bus_add_object_vtable(bus, NULL, object_path, interface,
+			dbus_vtable, NULL);
+
+	sd_bus_request_name(bus, bus_name, SD_BUS_NAME_REPLACE_EXISTING);
+
+	sd_bus_flush(bus);
+	sd_bus_get_unique_name(bus, &name);
+	intf->opened = 1;
+
+	return 0;
+}
+
+static void ipmi_dbus_close(struct ipmi_intf *intf)
+{
+	if (intf->opened)
+		sd_bus_close(bus);
+	intf->opened = 0;
+}
+
+struct ipmi_intf ipmi_dbus_intf = {
+	.name		= "dbus",
+	.desc		= "OpenBMC dbus interface",
+	.setup		= ipmi_dbus_setup,
+	.close		= ipmi_dbus_close,
+	.sendrecv	= ipmi_dbus_sendrecv,
+};
diff --git a/src/plugins/ipmi_intf.c b/src/plugins/ipmi_intf.c
index 9225a34..56c2543 100644
--- a/src/plugins/ipmi_intf.c
+++ b/src/plugins/ipmi_intf.c
@@ -89,8 +89,14 @@ extern struct ipmi_intf ipmi_dummy_intf;
 #ifdef IPMI_INTF_USB
 extern struct ipmi_intf ipmi_usb_intf;
 #endif
+#ifdef IPMI_INTF_DBUS
+extern struct ipmi_intf ipmi_dbus_intf;
+#endif
 
 struct ipmi_intf * ipmi_intf_table[] = {
+#ifdef IPMI_INTF_DBUS
+	&ipmi_dbus_intf,
+#endif
 #ifdef IPMI_INTF_OPEN
 	&ipmi_open_intf,
 #endif
-- 
2.17.1