/*
 * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
 * Copyright (c) 2016, Linaro Ltd.
 * 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.
 */

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

#include "diag.h"
#include "dm.h"
#include "hdlc.h"
#include "watch.h"

#define APPS_BUF_SIZE 16384

static int diag_sock_recv(int fd, void* data);

int diag_sock_connect(const char *hostname, unsigned short port)
{
	struct diag_client *client;
	struct sockaddr_in addr;
	struct hostent *host;
	int ret;
	int fd;

	fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
	if (fd < 0)
		return -errno;

	host = gethostbyname(hostname);
	if (!host)
		return -errno;

	bzero(&addr, sizeof(addr));
	addr.sin_family = AF_INET;
	bcopy(host->h_addr, &addr.sin_addr.s_addr, host->h_length);
	addr.sin_port = htons(port);

	ret = connect(fd, (const struct sockaddr *)&addr, sizeof(addr));
	if (ret < 0)
		return -errno;

	ret = fcntl(fd, F_SETFL, O_NONBLOCK);
	if (ret < 0)
		return -errno;

	printf("Connected to %s:%d\n", hostname, port);

	client = calloc(1, sizeof(*client));
	if (!client)
		err(1, "failed to allocate client context\n");

	client->fd = fd;
	client->name = "DIAG CLIENT";

	watch_add_readfd(client->fd, diag_sock_recv, client);
	watch_add_writeq(client->fd, &client->outq);

	dm_add(client);

	return fd;
}

static int diag_sock_recv(int fd, void* data)
{
	struct diag_client *client = (struct diag_client *)data;
	size_t msglen;
	ssize_t n;
	void *msg;
	int ret = 0;

	for (;;) {
		n = circ_read(fd, &client->recv_buf);
		if (n < 0 && errno == EAGAIN) {
			break;
		} else if (n < 0) {
			ret = -errno;
			warn("Failed to read from %s\n", client->name);
			break;
		}

		for (;;) {
			msg = hdlc_decode_one(&client->recv_decoder,
					      &client->recv_buf,
					      &msglen);
			if (!msg)
				break;

			diag_client_handle_command(client, msg, msglen);
		}
	}

	return ret;
}