8a1f79ab85
locked. - Move all the svr4 socket cache code into svr4_socket.c, specifically move svr4_delete_socket() over from streams.c. Make the socket cache entry structure and svr4_head private to svr4_socket.c as a result. - Add a mutex to protect the svr4 socket cache. - Change svr4_find_socket() to copy the sockaddr_un struct into a caller-supplied sockaddr_un rather than giving the caller a pointer to our internal one. This removes the one case where code outside of svr4_socket.c could access data in the cache. - Add an eventhandler for process_exit and process_exec to purge the cache of any entries for the exiting or execing process. - Add methods to init and destroy the socket cache and call them from the svr4 ABI module's event handler. - Conditionally grab Giant around socreate() in streamsopen(). - Use fdclose() instead of inlining it in streamsopen() when handling socreate() failure. - Only allocate a stream structure and attach it to a socket in streamsopen(). Previously, if a svr4 program performed a stream operation on an arbitrary socket not opened via the streams device, we would attach streams state data to it and change f_ops of the associated struct file while it was in use. The latter was especially not safe, and if a program wants a stream object it should open it via the streams device anyway. - Don't bother locking so_emuldata in the streams code now that we only touch it right after creating a socket (in streamsopen()) or when tearing it down when the file is closed. - Remove D_NEEDGIANT from the streams device as it is no longer needed.
242 lines
6.9 KiB
C
242 lines
6.9 KiB
C
/*-
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* Copyright (c) 1998 Mark Newton
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* Copyright (c) 1996 Christos Zoulas.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christos Zoulas.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* In SVR4 unix domain sockets are referenced sometimes
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* (in putmsg(2) for example) as a [device, inode] pair instead of a pathname.
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* Since there is no iname() routine in the kernel, and we need access to
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* a mapping from inode to pathname, we keep our own table. This is a simple
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* linked list that contains the pathname, the [device, inode] pair, the
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* file corresponding to that socket and the process. When the
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* socket gets closed we remove the item from the list. The list gets loaded
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* every time a stat(2) call finds a socket.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <sys/eventhandler.h>
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#include <sys/file.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysproto.h>
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#include <sys/un.h>
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#include <sys/stat.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <compat/svr4/svr4.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_util.h>
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#include <compat/svr4/svr4_socket.h>
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#include <compat/svr4/svr4_signal.h>
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#include <compat/svr4/svr4_sockmod.h>
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#include <compat/svr4/svr4_proto.h>
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struct svr4_sockcache_entry {
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struct proc *p; /* Process for the socket */
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void *cookie; /* Internal cookie used for matching */
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struct sockaddr_un sock;/* Pathname for the socket */
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dev_t dev; /* Device where the socket lives on */
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ino_t ino; /* Inode where the socket lives on */
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TAILQ_ENTRY(svr4_sockcache_entry) entries;
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};
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static TAILQ_HEAD(, svr4_sockcache_entry) svr4_head;
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static struct mtx svr4_sockcache_lock;
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static eventhandler_tag svr4_sockcache_exit_tag, svr4_sockcache_exec_tag;
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static void svr4_purge_sockcache(void *arg, struct proc *p);
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int
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svr4_find_socket(td, fp, dev, ino, saun)
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struct thread *td;
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struct file *fp;
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dev_t dev;
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ino_t ino;
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struct sockaddr_un *saun;
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{
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struct svr4_sockcache_entry *e;
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void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
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DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", td, dev, ino));
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mtx_lock(&svr4_sockcache_lock);
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TAILQ_FOREACH(e, &svr4_head, entries)
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if (e->p == td->td_proc && e->dev == dev && e->ino == ino) {
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#ifdef DIAGNOSTIC
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if (e->cookie != NULL && e->cookie != cookie)
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panic("svr4 socket cookie mismatch");
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#endif
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e->cookie = cookie;
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DPRINTF(("%s\n", e->sock.sun_path));
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*saun = e->sock;
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mtx_unlock(&svr4_sockcache_lock);
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return (0);
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}
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mtx_unlock(&svr4_sockcache_lock);
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DPRINTF(("not found\n"));
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return (ENOENT);
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}
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int
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svr4_add_socket(td, path, st)
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struct thread *td;
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const char *path;
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struct stat *st;
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{
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struct svr4_sockcache_entry *e;
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int len, error;
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e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
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e->cookie = NULL;
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e->dev = st->st_dev;
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e->ino = st->st_ino;
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e->p = td->td_proc;
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if ((error = copyinstr(path, e->sock.sun_path,
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sizeof(e->sock.sun_path), &len)) != 0) {
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DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
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free(e, M_TEMP);
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return error;
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}
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e->sock.sun_family = AF_LOCAL;
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e->sock.sun_len = len;
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mtx_lock(&svr4_sockcache_lock);
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TAILQ_INSERT_HEAD(&svr4_head, e, entries);
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mtx_unlock(&svr4_sockcache_lock);
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DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
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td->td_proc, e->dev, e->ino));
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return 0;
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}
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void
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svr4_delete_socket(p, fp)
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struct proc *p;
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struct file *fp;
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{
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struct svr4_sockcache_entry *e;
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void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
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mtx_lock(&svr4_sockcache_lock);
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TAILQ_FOREACH(e, &svr4_head, entries)
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if (e->p == p && e->cookie == cookie) {
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TAILQ_REMOVE(&svr4_head, e, entries);
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mtx_unlock(&svr4_sockcache_lock);
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DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n",
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e->sock.sun_path, p, (int)e->dev, e->ino));
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free(e, M_TEMP);
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return;
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}
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mtx_unlock(&svr4_sockcache_lock);
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}
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void
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svr4_purge_sockcache(arg, p)
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void *arg;
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struct proc *p;
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{
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struct svr4_sockcache_entry *e, *ne;
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mtx_lock(&svr4_sockcache_lock);
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TAILQ_FOREACH_SAFE(e, &svr4_head, entries, ne) {
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if (e->p == p) {
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TAILQ_REMOVE(&svr4_head, e, entries);
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DPRINTF(("svr4_purge_sockcache: %s [%p,%d,%d]\n",
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e->sock.sun_path, p, (int)e->dev, e->ino));
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free(e, M_TEMP);
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}
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}
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mtx_unlock(&svr4_sockcache_lock);
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}
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void
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svr4_sockcache_init(void)
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{
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TAILQ_INIT(&svr4_head);
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mtx_init(&svr4_sockcache_lock, "svr4 socket cache", NULL, MTX_DEF);
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svr4_sockcache_exit_tag = EVENTHANDLER_REGISTER(process_exit,
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svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY);
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svr4_sockcache_exec_tag = EVENTHANDLER_REGISTER(process_exec,
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svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY);
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}
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void
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svr4_sockcache_destroy(void)
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{
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KASSERT(TAILQ_EMPTY(&svr4_head),
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("%s: sockcache entries still around", __func__));
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EVENTHANDLER_DEREGISTER(process_exec, svr4_sockcache_exec_tag);
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EVENTHANDLER_DEREGISTER(process_exit, svr4_sockcache_exit_tag);
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mtx_destroy(&svr4_sockcache_lock);
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}
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int
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svr4_sys_socket(td, uap)
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struct thread *td;
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struct svr4_sys_socket_args *uap;
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{
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switch (uap->type) {
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case SVR4_SOCK_DGRAM:
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uap->type = SOCK_DGRAM;
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break;
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case SVR4_SOCK_STREAM:
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uap->type = SOCK_STREAM;
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break;
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case SVR4_SOCK_RAW:
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uap->type = SOCK_RAW;
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break;
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case SVR4_SOCK_RDM:
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uap->type = SOCK_RDM;
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break;
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case SVR4_SOCK_SEQPACKET:
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uap->type = SOCK_SEQPACKET;
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break;
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default:
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return EINVAL;
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}
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return socket(td, (struct socket_args *)uap);
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}
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