/*	$NetBSD: svr4_32_socket.c,v 1.13 2014/09/05 09:21:55 matt Exp $	*/

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * In SVR4 unix domain sockets are referenced sometimes
 * (in putmsg(2) for example) as a [device, inode] pair instead of a pathname.
 * Since there is no iname() routine in the kernel, and we need access to
 * a mapping from inode to pathname, we keep our own table. This is a simple
 * linked list that contains the pathname, the [device, inode] pair, the
 * file corresponding to that socket and the process. When the
 * socket gets closed we remove the item from the list. The list gets loaded
 * every time a stat(2) call finds a socket.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: svr4_32_socket.c,v 1.13 2014/09/05 09:21:55 matt Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/mbuf.h>
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syscallargs.h>
#include <sys/un.h>
#include <sys/stat.h>

#include <compat/svr4_32/svr4_32_types.h>
#include <compat/svr4_32/svr4_32_util.h>
#include <compat/svr4_32/svr4_32_socket.h>
#include <compat/svr4_32/svr4_32_signal.h>
#include <compat/svr4/svr4_sockmod.h>
#include <compat/svr4_32/svr4_32_lwp.h>
#include <compat/svr4_32/svr4_32_ucontext.h>
#include <compat/svr4_32/svr4_32_syscallargs.h>

struct svr4_sockcache_entry {
	struct proc *p;		/* Process for the socket		*/
	void *cookie;		/* Internal cookie used for matching	*/
	struct sockaddr_un sock;/* Pathname for the socket		*/
	dev_t dev;		/* Device where the socket lives on	*/
	svr4_ino_t ino;		/* Inode where the socket lives on	*/
	TAILQ_ENTRY(svr4_sockcache_entry) entries;
};

#if 0
static TAILQ_HEAD(svr4_sockcache_head, svr4_sockcache_entry) svr4_head;
static int initialized = 0;

struct sockaddr_un *
svr4_32_find_socket(struct proc *p, struct file *fp, dev_t dev, svr4_ino_t ino)
{
	struct svr4_sockcache_entry *e;
	void *cookie = fp->f_socekt->so_internal;

	if (!initialized) {
		DPRINTF(("svr4_32_find_socket: uninitialized [%p,%d,%d]\n",
		    p, dev, ino));
		TAILQ_INIT(&svr4_head);
		initialized = 1;
		return NULL;
	}


	DPRINTF(("svr4_32_find_socket: [%p,%d,%d]: ", p, dev, ino));
	for (e = svr4_head.tqh_first; e != NULL; e = e->entries.tqe_next)
		if (e->p == p && e->dev == dev && e->ino == ino) {
#ifdef DIAGNOSTIC
			if (e->cookie != NULL && e->cookie != cookie)
				panic("svr4_32 socket cookie mismatch");
#endif
			e->cookie = cookie;
			DPRINTF(("%s\n", e->sock.sun_path));
			return &e->sock;
		}

	DPRINTF(("not found\n"));
	return NULL;
}
#endif

#if 0
void
svr4_32_delete_socket(struct proc *p, struct file *fp)
{
	struct svr4_sockcache_entry *e;
	void *cookie = fp->f_socket->so_internal;

	if (!initialized) {
		TAILQ_INIT(&svr4_head);
		initialized = 1;
		return;
	}

	for (e = svr4_head.tqh_first; e != NULL; e = e->entries.tqe_next)
		if (e->p == p && e->cookie == cookie) {
			TAILQ_REMOVE(&svr4_head, e, entries);
			DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n",
				 e->sock.sun_path, p, e->dev, e->ino));
			free(e, M_TEMP);
			return;
		}
}
#endif

#if 0
int
svr4_32_add_socket(struct proc *p, const char *path, struct stat *st)
{
	struct svr4_sockcache_entry *e;
	size_t len;
	int error;

	if (!initialized) {
		TAILQ_INIT(&svr4_head);
		initialized = 1;
	}

	e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
	e->cookie = NULL;
	e->dev = st->st_dev;
	e->ino = st->st_ino;
	e->p = p;

	if ((error = copyinstr(path, e->sock.sun_path,
	    sizeof(e->sock.sun_path), &len)) != 0) {
		DPRINTF(("svr4_32_add_socket: copyinstr failed %d\n", error));
		free(e, M_TEMP);
		return error;
	}

	e->sock.sun_family = AF_LOCAL;
	e->sock.sun_len = len;

	TAILQ_INSERT_HEAD(&svr4_head, e, entries);
	DPRINTF(("svr4_32_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
		 p, e->dev, e->ino));
	return 0;
}
#endif

int
svr4_32_sys_socket(struct lwp *l, const struct svr4_32_sys_socket_args *uap, register_t *retval)
{
	struct sys___socket30_args uap0;

	/*
	 * We need to use a separate args since native has a different
	 * padding.
	 */
	SCARG(&uap0, domain) = SCARG(uap, domain);
	SCARG(&uap0, protocol) = SCARG(uap, protocol);
	switch (SCARG(uap, type)) {
	case SVR4_SOCK_DGRAM:
		SCARG(&uap0, type) = SOCK_DGRAM;
		break;

	case SVR4_SOCK_STREAM:
		SCARG(&uap0, type) = SOCK_STREAM;
		break;

	case SVR4_SOCK_RAW:
		SCARG(&uap0, type) = SOCK_RAW;
		break;

	case SVR4_SOCK_RDM:
		SCARG(&uap0, type) = SOCK_RDM;
		break;

	case SVR4_SOCK_SEQPACKET:
		SCARG(&uap0, type) = SOCK_SEQPACKET;
		break;
	default:
		return EINVAL;
	}
	return sys___socket30(l, &uap0, retval);
}