diff options
Diffstat (limited to 'sys/compat/svr4/svr4_socket.c')
| -rw-r--r-- | sys/compat/svr4/svr4_socket.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/sys/compat/svr4/svr4_socket.c b/sys/compat/svr4/svr4_socket.c new file mode 100644 index 0000000..038267c --- /dev/null +++ b/sys/compat/svr4/svr4_socket.c @@ -0,0 +1,242 @@ +/*- + * 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. + */ + +/* + * 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> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/queue.h> +#include <sys/eventhandler.h> +#include <sys/file.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/mutex.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 */ + dev_t dev; /* Device where the socket lives on */ + ino_t ino; /* Inode where the socket lives on */ + TAILQ_ENTRY(svr4_sockcache_entry) entries; +}; + +static TAILQ_HEAD(, svr4_sockcache_entry) svr4_head; +static struct mtx svr4_sockcache_lock; +static eventhandler_tag svr4_sockcache_exit_tag, svr4_sockcache_exec_tag; + +static void svr4_purge_sockcache(void *arg, struct proc *p); + +int +svr4_find_socket(td, fp, dev, ino, saun) + struct thread *td; + struct file *fp; + dev_t dev; + ino_t ino; + struct sockaddr_un *saun; +{ + struct svr4_sockcache_entry *e; + void *cookie = ((struct socket *)fp->f_data)->so_emuldata; + + DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", td, dev, ino)); + mtx_lock(&svr4_sockcache_lock); + TAILQ_FOREACH(e, &svr4_head, entries) + if (e->p == td->td_proc && 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)); + *saun = e->sock; + mtx_unlock(&svr4_sockcache_lock); + return (0); + } + + mtx_unlock(&svr4_sockcache_lock); + DPRINTF(("not found\n")); + return (ENOENT); +} + +int +svr4_add_socket(td, path, st) + struct thread *td; + const char *path; + struct stat *st; +{ + struct svr4_sockcache_entry *e; + size_t len; + int error; + + e = malloc(sizeof(*e), M_TEMP, M_WAITOK); + e->cookie = NULL; + e->dev = st->st_dev; + e->ino = st->st_ino; + e->p = td->td_proc; + + 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; + + mtx_lock(&svr4_sockcache_lock); + TAILQ_INSERT_HEAD(&svr4_head, e, entries); + mtx_unlock(&svr4_sockcache_lock); + DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path, + td->td_proc, e->dev, e->ino)); + return 0; +} + +void +svr4_delete_socket(p, fp) + struct proc *p; + struct file *fp; +{ + struct svr4_sockcache_entry *e; + void *cookie = ((struct socket *)fp->f_data)->so_emuldata; + + mtx_lock(&svr4_sockcache_lock); + TAILQ_FOREACH(e, &svr4_head, entries) + if (e->p == p && e->cookie == cookie) { + TAILQ_REMOVE(&svr4_head, e, entries); + mtx_unlock(&svr4_sockcache_lock); + DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n", + e->sock.sun_path, p, (int)e->dev, e->ino)); + free(e, M_TEMP); + return; + } + mtx_unlock(&svr4_sockcache_lock); +} + +void +svr4_purge_sockcache(arg, p) + void *arg; + struct proc *p; +{ + struct svr4_sockcache_entry *e, *ne; + + mtx_lock(&svr4_sockcache_lock); + TAILQ_FOREACH_SAFE(e, &svr4_head, entries, ne) { + if (e->p == p) { + TAILQ_REMOVE(&svr4_head, e, entries); + DPRINTF(("svr4_purge_sockcache: %s [%p,%d,%d]\n", + e->sock.sun_path, p, (int)e->dev, e->ino)); + free(e, M_TEMP); + } + } + mtx_unlock(&svr4_sockcache_lock); +} + +void +svr4_sockcache_init(void) +{ + + TAILQ_INIT(&svr4_head); + mtx_init(&svr4_sockcache_lock, "svr4 socket cache", NULL, MTX_DEF); + svr4_sockcache_exit_tag = EVENTHANDLER_REGISTER(process_exit, + svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY); + svr4_sockcache_exec_tag = EVENTHANDLER_REGISTER(process_exec, + svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY); +} + +void +svr4_sockcache_destroy(void) +{ + + KASSERT(TAILQ_EMPTY(&svr4_head), + ("%s: sockcache entries still around", __func__)); + EVENTHANDLER_DEREGISTER(process_exec, svr4_sockcache_exec_tag); + EVENTHANDLER_DEREGISTER(process_exit, svr4_sockcache_exit_tag); + mtx_destroy(&svr4_sockcache_lock); +} + +int +svr4_sys_socket(td, uap) + struct thread *td; + struct svr4_sys_socket_args *uap; +{ + switch (uap->type) { + case SVR4_SOCK_DGRAM: + uap->type = SOCK_DGRAM; + break; + + case SVR4_SOCK_STREAM: + uap->type = SOCK_STREAM; + break; + + case SVR4_SOCK_RAW: + uap->type = SOCK_RAW; + break; + + case SVR4_SOCK_RDM: + uap->type = SOCK_RDM; + break; + + case SVR4_SOCK_SEQPACKET: + uap->type = SOCK_SEQPACKET; + break; + default: + return EINVAL; + } + return sys_socket(td, (struct socket_args *)uap); +} |
