/*
 * Copyright (c) 2006-2007 Red Hat, Inc.
 *
 * All rights reserved.
 *
 * Author: Steven Dake <sdake@redhat.com>
 *
 * This software licensed under BSD license, the text of which follows:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - 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.
 * - Neither the name of the MontaVista Software, Inc. 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 OWNER 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 <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <corosync/corotypes.h>
#include <corosync/totem/totem.h>
#include <corosync/cfg.h>

static void ringstatusget_do (void)
{
	cs_error_t result;
	corosync_cfg_handle_t handle;
	unsigned int interface_count;
	char **interface_names;
	char **interface_status;
	unsigned int i;

	printf ("Printing ring status.\n");
	result = corosync_cfg_initialize (&handle, NULL);
	if (result != CS_OK) {
		printf ("Could not initialize corosync configuration API error %d\n", result);
		exit (1);
	}

	result = corosync_cfg_ring_status_get (handle,
				&interface_names,
				&interface_status,
				&interface_count);
	if (result != CS_OK) {
		printf ("Could not get the ring status, the error is: %d\n", result);
	} else {
		for (i = 0; i < interface_count; i++) {
			printf ("RING ID %d\n", i);
			printf ("\tid\t= %s\n", interface_names[i]);
			printf ("\tstatus\t= %s\n", interface_status[i]);
		}
	}
	(void)corosync_cfg_finalize (handle);
}

static void ringreenable_do (void)
{
	cs_error_t result;
	corosync_cfg_handle_t handle;

	printf ("Re-enabling all failed rings.\n");
	result = corosync_cfg_initialize (&handle, NULL);
	if (result != CS_OK) {
		printf ("Could not initialize corosync configuration API error %d\n", result);
		exit (1);
	}

	result = corosync_cfg_ring_reenable (handle);
	if (result != CS_OK) {
		printf ("Could not reenable ring error %d\n", result);
	}

	(void)corosync_cfg_finalize (handle);
}

void service_load_do (char *service, unsigned int version)
{
	cs_error_t result;
	corosync_cfg_handle_t handle;

	printf ("Loading service '%s' version '%d'\n", service, version);
	result = corosync_cfg_initialize (&handle, NULL);
	if (result != CS_OK) {
		printf ("Could not initialize corosync configuration API error %d\n", result);
		exit (1);
	}
	result = corosync_cfg_service_load (handle, service, version);
	if (result != CS_OK) {
		printf ("Could not load service (error = %d)\n", result);
	}
	(void)corosync_cfg_finalize (handle);
}

void service_unload_do (char *service, unsigned int version)
{
	cs_error_t result;
	corosync_cfg_handle_t handle;

	printf ("Unloading service '%s' version '%d'\n", service, version);
	result = corosync_cfg_initialize (&handle, NULL);
	if (result != CS_OK) {
		printf ("Could not initialize corosync configuration API error %d\n", result);
		exit (1);
	}
	result = corosync_cfg_service_unload (handle, service, version);
	if (result != CS_OK) {
		printf ("Could not unload service (error = %d)\n", result);
	}
	(void)corosync_cfg_finalize (handle);
}

void shutdown_callback (corosync_cfg_handle_t cfg_handle, CorosyncCfgShutdownFlagsT flags)
{
	printf("shutdown callback called, flags = %d\n",flags);

	(void)corosync_cfg_replyto_shutdown (cfg_handle, COROSYNC_CFG_SHUTDOWN_FLAG_YES);
}

void *shutdown_dispatch_thread(void *arg)
{
	int res = CS_OK;
	corosync_cfg_handle_t *handle = arg;

	while (res == CS_OK) {
		res = corosync_cfg_dispatch(*handle, CS_DISPATCH_ALL);
		if (res != CS_OK)
			printf ("Could not dispatch cfg messages: %d\n", res);
	}
	return NULL;
}

void shutdown_do()
{
	cs_error_t result;
	corosync_cfg_handle_t handle;
	CorosyncCfgCallbacksT callbacks;
	CorosyncCfgStateNotificationT notificationBuffer;
	pthread_t dispatch_thread;

	printf ("Shutting down corosync\n");
	callbacks.corosyncCfgShutdownCallback = shutdown_callback;

	result = corosync_cfg_initialize (&handle, &callbacks);
	if (result != CS_OK) {
		printf ("Could not initialize corosync configuration API error %d\n", result);
		exit (1);
	}

	pthread_create(&dispatch_thread, NULL, shutdown_dispatch_thread, &handle);

	result = corosync_cfg_state_track (handle,
					   0,
					   &notificationBuffer);
	if (result != CS_OK) {
		printf ("Could not start corosync cfg tracking error %d\n", result);
		exit (1);
	}

	result = corosync_cfg_try_shutdown (handle, COROSYNC_CFG_SHUTDOWN_FLAG_REQUEST);
	if (result != CS_OK) {
		printf ("Could not shutdown (error = %d)\n", result);
	}

	(void)corosync_cfg_finalize (handle);
}

void showaddrs_do(int nodeid)
{
	cs_error_t result;
	corosync_cfg_handle_t handle;
	CorosyncCfgCallbacksT callbacks;
	int numaddrs;
	int i;
	CorosyncCfgNodeAddressT addrs[INTERFACE_MAX];


	result = corosync_cfg_initialize (&handle, &callbacks);
	if (result != CS_OK) {
		printf ("Could not initialize corosync configuration API error %d\n", result);
		exit (1);
	}

	if (!corosync_cfg_get_node_addrs(handle, nodeid, INTERFACE_MAX, &numaddrs, addrs) == CS_OK) {
		for (i=0; i<numaddrs; i++) {
			char buf[INET6_ADDRSTRLEN];
			struct sockaddr_storage *ss = (struct sockaddr_storage *)addrs[i].address;
			struct sockaddr_in *sin = (struct sockaddr_in *)addrs[i].address;
			struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addrs[i].address;
			void *saddr;

			if (ss->ss_family == AF_INET6)
				saddr = &sin6->sin6_addr;
			else
				saddr = &sin->sin_addr;

			inet_ntop(ss->ss_family, saddr, buf, sizeof(buf));
			printf("%s", buf);
		}
		printf("\n");
	}


	(void)corosync_cfg_finalize (handle);
}

void killnode_do(unsigned int nodeid)
{
	cs_error_t result;
	corosync_cfg_handle_t handle;

	printf ("Killing node %d\n", nodeid);
	result = corosync_cfg_initialize (&handle, NULL);
	if (result != CS_OK) {
		printf ("Could not initialize corosync configuration API error %d\n", result);
		exit (1);
	}
	result = corosync_cfg_kill_node (handle, nodeid, "Killed by corosync-cfgtool");
	if (result != CS_OK) {
		printf ("Could not kill node (error = %d)\n", result);
	}
	(void)corosync_cfg_finalize (handle);
}


void usage_do (void)
{
	printf ("corosync-cfgtool [-s] [-r] [-l] [-u] [service_name] [-v] [version] [-k] [nodeid] [-a] [nodeid]\n\n");
	printf ("A tool for displaying and configuring active parameters within corosync.\n");
	printf ("options:\n");
	printf ("\t-s\tDisplays the status of the current rings on this node.\n");
	printf ("\t-r\tReset redundant ring state cluster wide after a fault to\n");
	printf ("\t\tre-enable redundant ring operation.\n");
	printf ("\t-l\tLoad a service identified by name.\n");
	printf ("\t-u\tUnload a service identified by name.\n");
	printf ("\t-a\tDisplay the IP address(es) of a node\n");
	printf ("\t-k\tKill a node identified by node id.\n");
	printf ("\t-h\tShutdown corosync cleanly on this node.\n");
}

int main (int argc, char *argv[]) {
	const char *options = "srl:u:v:k:a:h";
	int opt;
	int service_load = 0;
	unsigned int nodeid;
	int service_unload = 0;
	char *service = NULL;
	unsigned int version = 0;

	if (argc == 1) {
		usage_do ();
	}
	while ( (opt = getopt(argc, argv, options)) != -1 ) {
		switch (opt) {
		case 's':
			ringstatusget_do ();
			break;
		case 'r':
			ringreenable_do ();
			break;
		case 'l':
			service_load = 1;
			service = strdup (optarg);
			break;
		case 'u':
			service_unload = 1;
			service = strdup (optarg);
			break;
		case 'k':
			nodeid = atoi (optarg);
			killnode_do(nodeid);
			break;
		case 'h':
			shutdown_do();
			break;
		case 'a':
			showaddrs_do( atoi(optarg) );
			break;
		case 'v':
			version = atoi (optarg);
			break;
		}
	}

	if (service_load) {
		service_load_do (service, version);
	} else
	if (service_unload) {
		service_unload_do (service, version);
	}

	return (0);
}