/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0.  If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <isc/managers.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/socket.h>
#include <isc/string.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <isc/util.h>

isc_mem_t *mctx = NULL;
isc_nm_t *netmgr = NULL;
isc_taskmgr_t *taskmgr = NULL;

static void
my_shutdown(isc_task_t *task, isc_event_t *event) {
	char *name = event->ev_arg;

	printf("shutdown %s (%p)\n", name, task);
	fflush(stdout);
	isc_event_free(&event);
}

static void
my_send(isc_task_t *task, isc_event_t *event) {
	isc_socket_t *sock;
	isc_socketevent_t *dev;

	sock = event->ev_sender;
	dev = (isc_socketevent_t *)event;

	printf("my_send: %s task %p\n\t(sock %p, base %p, length %u, n %u, "
	       "result %u)\n",
	       (char *)(event->ev_arg), task, sock, dev->region.base,
	       dev->region.length, dev->n, dev->result);

	if (dev->result != ISC_R_SUCCESS) {
		isc_socket_detach(&sock);
		isc_task_shutdown(task);
	}

	if (dev->region.base != NULL) {
		isc_mem_put(mctx, dev->region.base, dev->region.length);
	}

	isc_event_free(&event);
}

static void
my_recv(isc_task_t *task, isc_event_t *event) {
	isc_socket_t *sock;
	isc_socketevent_t *dev;
	isc_region_t region;
	char buf[1024];
	char host[256];

	sock = event->ev_sender;
	dev = (isc_socketevent_t *)event;

	printf("Socket %s (sock %p, base %p, length %u, n %u, result %u)\n",
	       (char *)(event->ev_arg), sock, dev->region.base,
	       dev->region.length, dev->n, dev->result);
	if (dev->address.type.sa.sa_family == AF_INET6) {
		inet_ntop(AF_INET6, &dev->address.type.sin6.sin6_addr, host,
			  sizeof(host));
		printf("\tFrom: %s port %d\n", host,
		       ntohs(dev->address.type.sin6.sin6_port));
	} else {
		inet_ntop(AF_INET, &dev->address.type.sin.sin_addr, host,
			  sizeof(host));
		printf("\tFrom: %s port %d\n", host,
		       ntohs(dev->address.type.sin.sin_port));
	}

	if (dev->result != ISC_R_SUCCESS) {
		isc_socket_detach(&sock);

		if (dev->region.base != NULL) {
			isc_mem_put(mctx, dev->region.base, dev->region.length);
		}
		isc_event_free(&event);

		isc_task_shutdown(task);
		return;
	}

	/*
	 * Echo the data back.
	 */
	if (strcmp(event->ev_arg, "so2") != 0) {
		region = dev->region;
		snprintf(buf, sizeof(buf), "\r\nReceived: %.*s\r\n\r\n",
			 (int)dev->n, (char *)region.base);
		region.base = isc_mem_get(mctx, strlen(buf) + 1);
		{
			region.length = strlen(buf) + 1;
			strlcpy((char *)region.base, buf, region.length);
		}
		isc_socket_send(sock, &region, task, my_send, event->ev_arg);
	} else {
		region = dev->region;
		printf("\r\nReceived: %.*s\r\n\r\n", (int)dev->n,
		       (char *)region.base);
	}

	isc_socket_recv(sock, &dev->region, 1, task, my_recv, event->ev_arg);

	isc_event_free(&event);
}

static void
my_http_get(isc_task_t *task, isc_event_t *event) {
	isc_socket_t *sock;
	isc_socketevent_t *dev;

	sock = event->ev_sender;
	dev = (isc_socketevent_t *)event;

	printf("my_http_get: %s task %p\n\t(sock %p, base %p, length %u, "
	       "n %u, result %u)\n",
	       (char *)(event->ev_arg), task, sock, dev->region.base,
	       dev->region.length, dev->n, dev->result);

	if (dev->result != ISC_R_SUCCESS) {
		isc_socket_detach(&sock);
		isc_task_shutdown(task);
		if (dev->region.base != NULL) {
			isc_mem_put(mctx, dev->region.base, dev->region.length);
		}
		isc_event_free(&event);
		return;
	}

	isc_socket_recv(sock, &dev->region, 1, task, my_recv, event->ev_arg);

	isc_event_free(&event);
}

static void
my_connect(isc_task_t *task, isc_event_t *event) {
	isc_socket_t *sock;
	isc_socket_connev_t *dev;
	isc_region_t region;
	char buf[1024];

	sock = event->ev_sender;
	dev = (isc_socket_connev_t *)event;

	printf("%s: Connection result:  %u\n", (char *)(event->ev_arg),
	       dev->result);

	if (dev->result != ISC_R_SUCCESS) {
		isc_socket_detach(&sock);
		isc_event_free(&event);
		isc_task_shutdown(task);
		return;
	}

	/*
	 * Send a GET string, and set up to receive (and just display)
	 * the result.
	 */
	snprintf(buf, sizeof(buf),
		 "GET / HTTP/1.1\r\nHost: www.flame.org\r\n"
		 "Connection: Close\r\n\r\n");
	region.base = isc_mem_get(mctx, strlen(buf) + 1);
	{
		region.length = strlen(buf) + 1;
		strlcpy((char *)region.base, buf, region.length);
	}

	isc_socket_send(sock, &region, task, my_http_get, event->ev_arg);

	isc_event_free(&event);
}

static void
my_listen(isc_task_t *task, isc_event_t *event) {
	char *name = event->ev_arg;
	isc_socket_newconnev_t *dev = NULL;
	isc_region_t region;
	isc_socket_t *oldsock = NULL;
	isc_task_t *newtask = NULL;

	dev = (isc_socket_newconnev_t *)event;

	printf("newcon %s (task %p, oldsock %p, newsock %p, result %u)\n", name,
	       task, event->ev_sender, dev->newsocket, dev->result);
	fflush(stdout);

	if (dev->result == ISC_R_SUCCESS) {
		/*
		 * Queue another listen on this socket.
		 */
		RUNTIME_CHECK(isc_socket_accept(event->ev_sender, task,
						my_listen, event->ev_arg) ==
			      ISC_R_SUCCESS);

		region.base = isc_mem_get(mctx, 20);
		region.length = 20;

		/*
		 * Create a new task for this socket, and queue up a
		 * recv on it.
		 */
		RUNTIME_CHECK(isc_task_create(taskmgr, 0, &newtask) ==
			      ISC_R_SUCCESS);
		isc_socket_recv(dev->newsocket, &region, 1, newtask, my_recv,
				event->ev_arg);
		isc_task_detach(&newtask);
	} else {
		printf("detaching from socket %p\n", event->ev_sender);
		oldsock = event->ev_sender;

		isc_socket_detach(&oldsock);

		isc_event_free(&event);
		isc_task_shutdown(task);
		return;
	}

	isc_event_free(&event);
}

static void
timeout(isc_task_t *task, isc_event_t *event) {
	isc_socket_t *sock = event->ev_arg;

	printf("Timeout, canceling IO on socket %p (task %p)\n", sock, task);

	isc_socket_cancel(sock, NULL, ISC_SOCKCANCEL_ALL);
	isc_timer_destroy((isc_timer_t **)&event->ev_sender);
	isc_event_free(&event);
}

static char one[] = "1";
static char two[] = "2";
static char xso1[] = "so1";
static char xso2[] = "so2";

int
main(int argc, char *argv[]) {
	isc_task_t *t1 = NULL, *t2 = NULL;
	isc_timermgr_t *timgr = NULL;
	isc_time_t expires;
	isc_interval_t interval;
	isc_timer_t *ti1 = NULL;
	unsigned int workers;
	isc_socketmgr_t *socketmgr = NULL;
	isc_socket_t *so1 = NULL, *so2 = NULL;
	isc_sockaddr_t sockaddr;
	struct in_addr ina;
	struct in6_addr in6a;
	isc_result_t result;
	int pf;

	if (argc > 1) {
		workers = atoi(argv[1]);
		if (workers < 1) {
			workers = 1;
		}
		if (workers > 8192) {
			workers = 8192;
		}
	} else {
		workers = 2;
	}
	printf("%u workers\n", workers);

	if (isc_net_probeipv6() == ISC_R_SUCCESS) {
		pf = PF_INET6;
	} else {
		pf = PF_INET;
	}

	/*
	 * EVERYTHING needs a memory context.
	 */
	isc_mem_create(&mctx);

	/*
	 * The task manager is independent (other than memory context)
	 */
	RUNTIME_CHECK(isc_managers_create(mctx, workers, 0, &netmgr,
					  &taskmgr) == ISC_R_SUCCESS);

	/*
	 * Timer manager depends only on the memory context as well.
	 */
	RUNTIME_CHECK(isc_timermgr_create(mctx, &timgr) == ISC_R_SUCCESS);

	RUNTIME_CHECK(isc_task_create(taskmgr, 0, &t1) == ISC_R_SUCCESS);
	RUNTIME_CHECK(isc_task_create(taskmgr, 0, &t2) == ISC_R_SUCCESS);
	RUNTIME_CHECK(isc_task_onshutdown(t1, my_shutdown, one) ==
		      ISC_R_SUCCESS);
	RUNTIME_CHECK(isc_task_onshutdown(t2, my_shutdown, two) ==
		      ISC_R_SUCCESS);

	printf("task 1 = %p\n", t1);
	printf("task 2 = %p\n", t2);

	RUNTIME_CHECK(isc_socketmgr_create(mctx, &socketmgr) == ISC_R_SUCCESS);

	/*
	 * Open up a listener socket.
	 */

	if (pf == PF_INET6) {
		in6a = in6addr_any;
		isc_sockaddr_fromin6(&sockaddr, &in6a, 5544);
	} else {
		ina.s_addr = INADDR_ANY;
		isc_sockaddr_fromin(&sockaddr, &ina, 5544);
	}
	RUNTIME_CHECK(isc_socket_create(socketmgr, pf, isc_sockettype_tcp,
					&so1) == ISC_R_SUCCESS);
	result = isc_socket_bind(so1, &sockaddr, ISC_SOCKET_REUSEADDRESS);
	RUNTIME_CHECK(result == ISC_R_SUCCESS);
	RUNTIME_CHECK(isc_socket_listen(so1, 0) == ISC_R_SUCCESS);

	/*
	 * Queue up the first accept event.
	 */
	RUNTIME_CHECK(isc_socket_accept(so1, t1, my_listen, xso1) ==
		      ISC_R_SUCCESS);
	isc_time_settoepoch(&expires);
	isc_interval_set(&interval, 10, 0);
	RUNTIME_CHECK(isc_timer_create(timgr, isc_timertype_once, &expires,
				       &interval, t1, timeout, so1,
				       &ti1) == ISC_R_SUCCESS);

	/*
	 * Open up a socket that will connect to www.flame.org, port 80.
	 * Why not.  :)
	 */
	ina.s_addr = inet_addr("204.152.184.97");
	if (0 && pf == PF_INET6) {
		isc_sockaddr_v6fromin(&sockaddr, &ina, 80);
	} else {
		isc_sockaddr_fromin(&sockaddr, &ina, 80);
	}
	RUNTIME_CHECK(isc_socket_create(socketmgr, isc_sockaddr_pf(&sockaddr),
					isc_sockettype_tcp,
					&so2) == ISC_R_SUCCESS);

	RUNTIME_CHECK(isc_socket_connect(so2, &sockaddr, t2, my_connect,
					 xso2) == ISC_R_SUCCESS);

	/*
	 * Detaching these is safe, since the socket will attach to the
	 * task for any outstanding requests.
	 */
	isc_task_detach(&t1);
	isc_task_detach(&t2);

	/*
	 * Wait a short while.
	 */
#ifndef WIN32
	sleep(10);
#else  /* ifndef WIN32 */
	Sleep(10000);
#endif /* ifndef WIN32 */

	fprintf(stderr, "Destroying socket manager\n");
	isc_socketmgr_destroy(&socketmgr);

	fprintf(stderr, "Destroying timer manager\n");
	isc_timermgr_destroy(&timgr);

	fprintf(stderr, "Destroying task manager\n");
	isc_managers_destroy(&netmgr, &taskmgr);

	isc_mem_stats(mctx, stdout);
	isc_mem_destroy(&mctx);

	return (0);
}