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version 5.7

/*************************************************************************
* (C) 2013 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
*  by Michael Pounov <misho@elwix.org>
*
* $Author: misho $
* $Id: sock.c,v 1.3 2013/09/02 11:16:27 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
	by Michael Pounov <misho@elwix.org>.  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. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET 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 AITNET 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 REGENTS 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 "global.h"


/*
 * ioInitSocket() - Init socket and allocate resources
 *
 * @role = Socket role
 * @type = Socket type
 * @proto = Socket protocol
 * @addr = Bind to address
 * @port = Bind to port
 * @buflen = Socket buffer, optional if =0 == BUFSIZ
 * return: NULL error or !=NULL created socket
 */
sock_t *
ioInitSocket(int role, int type, int proto, const char *addr, u_short port, size_t buflen)
{
	sock_t *s = NULL;
	int n = 1;

	if (!addr)
		return NULL;

	s = e_malloc(sizeof(sock_t));
	if (!s) {
		io_SetErr(elwix_GetErrno(), "%s", elwix_GetError());
		return NULL;
	} else
		memset(s, 0, sizeof(sock_t));

	TAILQ_INIT(&s->sock_cli);

	s->sock_role = role;
	s->sock_type = type;
	s->sock_proto = proto;
	if (!e_gethostbyname(addr, port, &s->sock_addr)) {
		io_SetErr(elwix_GetErrno(), "%s", elwix_GetError());
		e_free(s);
		return NULL;
	} else {
		buflen = buflen ? buflen : BUFSIZ;
		AIT_SET_BUFSIZ(&s->sock_buf, 0, buflen);
	}

	s->sock_fd = socket(s->sock_addr.sa.sa_family, s->sock_type, s->sock_proto);
	if (s->sock_fd == -1) {
		LOGERR;
		AIT_FREE_VAL(&s->sock_buf);
		e_free(s);
		return NULL;
	}
	if (setsockopt(s->sock_fd, SOL_SOCKET, SO_SNDBUF, &buflen, sizeof buflen) == -1) {
		LOGERR;
		AIT_FREE_VAL(&s->sock_buf);
		e_free(s);
		return NULL;
	}
	if (setsockopt(s->sock_fd, SOL_SOCKET, SO_RCVBUF, &buflen, sizeof buflen) == -1) {
		LOGERR;
		AIT_FREE_VAL(&s->sock_buf);
		e_free(s);
		return NULL;
	}
	if (setsockopt(s->sock_fd, SOL_SOCKET, SO_REUSEADDR, &n, sizeof n) == -1) {
		LOGERR;
		AIT_FREE_VAL(&s->sock_buf);
		e_free(s);
		return NULL;
	}
	if (bind(s->sock_fd, &s->sock_addr.sa, s->sock_addr.sa.sa_len) == -1) {
		LOGERR;
		AIT_FREE_VAL(&s->sock_buf);
		e_free(s);
		return NULL;
	}

	pthread_mutex_init(&s->sock_mtx, NULL);
	return s;
}

/*
 * ioCloseSocket() - Close socket and free resources
 *
 * @s = Socket
 * return: none
 */
void
ioCloseSocket(sock_t ** __restrict s)
{
	sock_cli_t	*cli;

	if (s && *s) {
		pthread_mutex_lock(&(*s)->sock_mtx);
		while ((cli = TAILQ_FIRST(&(*s)->sock_cli))) {
			TAILQ_REMOVE(&(*s)->sock_cli, cli, cli_node);
			shutdown(cli->cli_fd, SHUT_RDWR);
			close(cli->cli_fd);
			AIT_FREE_VAL(&cli->cli_buf);
			e_free(cli);
		}
		pthread_mutex_unlock(&(*s)->sock_mtx);

		shutdown((*s)->sock_fd, SHUT_RDWR);
		close((*s)->sock_fd);

		AIT_FREE_VAL(&(*s)->sock_buf);

		pthread_mutex_destroy(&(*s)->sock_mtx);
		e_free(*s);
		*s = NULL;
	}
}

/*
 * ioUpSocket() - Setup socket for use
 *
 * @s = Socket
 * @arg = Server role = listen backlog queue and Client role = peer address
 * return: -1 error or 0 ok
 */
int
ioUpSocket(sock_t * __restrict s, void *arg)
{
	int ret = 0;
	sockaddr_t *peer = (sockaddr_t*) arg;
	uintptr_t backlog = (uintptr_t) arg;

	if (!s || !arg)
		return -1;

	switch (s->sock_role) {
		case IO_SOCK_ROLE_CLIENT:
			memcpy(&s->sock_peer, peer, sizeof s->sock_peer);

			if (connect(s->sock_fd, &s->sock_peer.sa, 
						s->sock_peer.sa.sa_len) == -1) {
				LOGERR;
				return -1;
			}
			break;
		case IO_SOCK_ROLE_SERVER:
			if (s->sock_type == SOCK_STREAM) {
				s->sock_backq = backlog;

				if (listen(s->sock_fd, s->sock_backq) == -1) {
					LOGERR;
					return -1;
				}
			}
			break;
		default:
			io_SetErr(EINVAL, "Unsupported socket type");
			return -1;
	}

	fcntl(s->sock_fd, F_SETFL, fcntl(s->sock_fd, F_GETFL) | O_NONBLOCK);
	return ret;
}

static void
thrCliClean(void *arg)
{
	sock_cli_t *cli = (sock_cli_t*) arg;
	sock_t *s = (sock_t*) cli->cli_parent;

	if (s->sock_type == SOCK_STREAM) {
		shutdown(cli->cli_fd, SHUT_RDWR);
		close(cli->cli_fd);
	}
	AIT_FREE_VAL(&cli->cli_buf);

	pthread_mutex_lock(&s->sock_mtx);
	TAILQ_REMOVE(&s->sock_cli, cli, cli_node);
	pthread_mutex_unlock(&s->sock_mtx);

	e_free(cli);
}

static void *
io_thrCliWrapper(void *arg)
{
	void *ret;
	sock_cli_t *cli = (sock_cli_t*) arg;

	pthread_cleanup_push(thrCliClean, arg);

	ret = cli->cli_func(cli);

	pthread_cleanup_pop(42);
	pthread_exit(ret);
}

/*
 * ioAcceptSocket() - Accept clients
 *
 * @s = Socket
 * @f = callback function for client handling
 * @arg = optional argument for callback function
 * return: -1 error or 0 ok
 */
int
ioAcceptSocket(sock_t * __restrict s, sock_cb_t f, void *arg)
{
	struct pollfd pfd[1];
	socklen_t salen;
	sockaddr_t sa;
	int c, rlen;
	sock_cli_t *cli;
	u_char buf[BUFSIZ] = { [0 ... BUFSIZ - 1] = 0 };

	if (!s || s->sock_role == IO_SOCK_ROLE_CLIENT || !f)
		return -1;

	pfd->fd = s->sock_fd;
	pfd->events = POLLIN | POLLPRI;
	do {
		if (poll(pfd, 1, -1) < 1 || 
				pfd->revents & (POLLNVAL | POLLHUP | POLLERR)) {
			LOGERR;
			return -1;
		} else
			salen = sizeof sa.ss;

		if (s->sock_type == SOCK_STREAM) {
			if ((c = accept(s->sock_fd, &sa.sa, &salen)) == -1) {
				LOGERR;
				return -1;
			}
		} else {
			if ((rlen = recvfrom(s->sock_fd, buf, sizeof buf, MSG_PEEK, 
							&sa.sa, &salen)) == -1) {
				LOGERR;
				return -1;
			} else
				c = s->sock_fd;
		}

		cli = e_malloc(sizeof(sock_cli_t));
		if (!cli) {
			io_SetErr(elwix_GetErrno(), "%s", elwix_GetError());
			if (s->sock_type == SOCK_STREAM)
				close(c);
			return -1;
		} else
			memset(cli, 0, sizeof(sock_cli_t));

		cli->cli_parent = s;
		cli->cli_fd = c;
		cli->cli_func = f;
		cli->cli_arg = arg;
		memcpy(&cli->cli_addr, &sa, sizeof cli->cli_addr);
		AIT_SET_BUFSIZ(&cli->cli_buf, 0, AIT_LEN(&s->sock_buf));

		if (pthread_create(&cli->cli_tid, NULL, io_thrCliWrapper, cli) == -1) {
			LOGERR;
			if (s->sock_type == SOCK_STREAM)
				close(c);
			AIT_FREE_VAL(&cli->cli_buf);
			e_free(cli);
			return -1;
		} else {
			pthread_detach(cli->cli_tid);
			pthread_mutex_lock(&s->sock_mtx);
			TAILQ_INSERT_TAIL(&s->sock_cli, cli, cli_node);
			pthread_mutex_unlock(&s->sock_mtx);
		}
	} while (42);

	return 0;
}