/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 2018, Joyent, Inc.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <errno.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/stat.h>
#include <sys/sdt.h>
#include <signal.h>
#include <fcntl.h>
#include <libstmfproxy.h>

/*
 * NOTE:
 * This is demo code to be used with the existing demo proxy daemon
 * svc-stmfproxy in /usr/demo/comstar.
 */

struct _s_handle {
	int	sockfd;
};

typedef struct _s_handle s_handle_t;

static ssize_t
pt_socket_recv(void *handle, void *buf, size_t len)
{
	s_handle_t *sh = handle;

	return (recv(sh->sockfd, buf, len, MSG_WAITALL));
}

static ssize_t
pt_socket_send(void *handle, void *buf, size_t len)
{
	s_handle_t *sh = handle;

	return (send(sh->sockfd, buf, len, 0));
}

static void *
pt_socket_connect(int server_node, char *server)
{
	int sfd, new_sfd;
	s_handle_t *sh = NULL;
	int on = 1;
	struct sockaddr_in cli_addr, serv_addr;
	struct	sockaddr_in sin;
	int cliLen = sizeof (cli_addr);

	if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) <= 0) {
		syslog(LOG_DAEMON|LOG_WARNING,
		    "socket() call failed: %d", errno);
		return (NULL);
	}

	if (server_node) {

		if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on,
		    sizeof (on)) < 0) {
			syslog(LOG_DAEMON|LOG_WARNING,
			    "setsockopt() failed: %d", errno);
			goto serv_out;
		}

		bzero(&serv_addr, sizeof (serv_addr));
		serv_addr.sin_family = AF_INET;
		serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
		/* XXX get from smf? */
		serv_addr.sin_port = htons(6543);

		if (bind(sfd, (struct sockaddr *)&serv_addr,
		    sizeof (serv_addr)) < 0) {
			syslog(LOG_DAEMON|LOG_WARNING, "bind() call failed: %d",
			    errno);
			goto serv_out;
		}

		(void) listen(sfd, 5);

		new_sfd = accept(sfd, (struct sockaddr *)&cli_addr, &cliLen);

		if (new_sfd < 0) {
			syslog(LOG_DAEMON|LOG_WARNING, "accept failed: %d",
			    errno);
			goto serv_out;
		}
		sh = malloc(sizeof (*sh));
		sh->sockfd = new_sfd;
serv_out:
		(void) close(sfd);
	} else {
		struct	hostent *hp;

		/*
		 * Assume IP dot notation or if that fails, gethostbyname()
		 * If that fails, return
		 */
		if ((inet_aton(server, &sin.sin_addr)) == 0) {
			if ((hp = gethostbyname(server)) != NULL) {
				memcpy(&sin.sin_addr.s_addr, hp->h_addr,
				    hp->h_length);
			} else {
				syslog(LOG_DAEMON|LOG_CRIT,
				    "Cannot get IP address for %s", server);
				(void) close(sfd);
				return (NULL);
			}
		} else {
			fprintf(stderr,
			    "Sorry, cannot use ip address format\n");
			(void) close(sfd);
			return (NULL);
		}
		sin.sin_family = AF_INET;
		/* XXX pass in from smf */
		sin.sin_port = htons(6543);

		while (connect(sfd, (struct sockaddr *)&sin,
		    sizeof (sin)) < 0) {
			(void) close(sfd);
			if (errno == ECONNREFUSED) {
				/* get a fresh socket and retry */
				sfd = socket(AF_INET, SOCK_STREAM, 0);
				if (sfd < 0) {
					syslog(LOG_DAEMON|LOG_WARNING,
					    "socket() call failed: %d", errno);
					return (NULL);
				}
				(void) sleep(2);
			} else {
				syslog(LOG_DAEMON|LOG_CRIT,
				    "Cannot connect %s - %d", server, errno);
				return (NULL);
			}
		}
		sh = malloc(sizeof (*sh));
		sh->sockfd = sfd;
	}
	return (sh);
}

pt_ops_t pt_socket_ops = {
	pt_socket_connect,
	pt_socket_send,
	pt_socket_recv
};

int
stmf_proxy_transport_init(char *transport, pt_ops_t **pt_ops)
{
	if (strcmp(transport, "sockets") == 0) {
		*pt_ops = &pt_socket_ops;
		return (0);
	} else {
		return (-1);
	}
}