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/*
* Copyright (c) 1998 Mark Newton
* Copyright (c) 1996 Christos Zoulas.
* 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 Christos Zoulas.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $FreeBSD$
*/
/*
* 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/param.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysproto.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <compat/svr4/svr4.h>
#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_util.h>
#include <compat/svr4/svr4_socket.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_sockmod.h>
#include <compat/svr4/svr4_proto.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 */
udev_t dev; /* Device where the socket lives on */
ino_t ino; /* Inode where the socket lives on */
TAILQ_ENTRY(svr4_sockcache_entry) entries;
};
extern TAILQ_HEAD(svr4_sockcache_head, svr4_sockcache_entry) svr4_head;
extern int svr4_str_initialized;
struct sockaddr_un *
svr4_find_socket(p, fp, dev, ino)
struct proc *p;
struct file *fp;
udev_t dev;
ino_t ino;
{
struct svr4_sockcache_entry *e;
void *cookie = ((struct socket *) fp->f_data)->so_emuldata;
if (svr4_str_initialized != 2) {
if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
DPRINTF(("svr4_find_socket: uninitialized [%p,%d,%d]\n",
p, dev, ino));
TAILQ_INIT(&svr4_head);
atomic_store_rel_int(&svr4_str_initialized, 2);
}
return NULL;
}
DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", p, dev, ino));
TAILQ_FOREACH(e, &svr4_head, entries)
if (e->p == p && e->dev == dev && e->ino == ino) {
#ifdef DIAGNOSTIC
if (e->cookie != NULL && e->cookie != cookie)
panic("svr4 socket cookie mismatch");
#endif
e->cookie = cookie;
DPRINTF(("%s\n", e->sock.sun_path));
return &e->sock;
}
DPRINTF(("not found\n"));
return NULL;
}
/*
* svr4_delete_socket() is in sys/dev/streams.c (because it's called by
* the streams "soo_close()" routine).
*/
int
svr4_add_socket(p, path, st)
struct proc *p;
const char *path;
struct stat *st;
{
struct svr4_sockcache_entry *e;
int len, error;
/*
* Wait for the TAILQ to be initialized. Only the very first CPU
* will succeed on the atomic_cmpset(). The other CPU's will spin
* until the first one finishes the initialization. Once the
* initialization is complete, the condition will always fail
* avoiding expensive atomic operations in the common case.
*/
while (svr4_str_initialized != 2)
if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
TAILQ_INIT(&svr4_head);
atomic_store_rel_int(&svr4_str_initialized, 2);
}
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_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_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
p, e->dev, e->ino));
return 0;
}
int
svr4_sys_socket(p, uap)
struct proc *p;
struct svr4_sys_socket_args *uap;
{
switch (SCARG(uap, type)) {
case SVR4_SOCK_DGRAM:
SCARG(uap, type) = SOCK_DGRAM;
break;
case SVR4_SOCK_STREAM:
SCARG(uap, type) = SOCK_STREAM;
break;
case SVR4_SOCK_RAW:
SCARG(uap, type) = SOCK_RAW;
break;
case SVR4_SOCK_RDM:
SCARG(uap, type) = SOCK_RDM;
break;
case SVR4_SOCK_SEQPACKET:
SCARG(uap, type) = SOCK_SEQPACKET;
break;
default:
return EINVAL;
}
return socket(p, (struct socket_args *)uap);
}
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