svr4_socket.c

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    1 /*-
    2  * Copyright (c) 1998 Mark Newton
    3  * Copyright (c) 1996 Christos Zoulas. 
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by Christos Zoulas.
   17  * 4. The name of the author may not be used to endorse or promote products
   18  *    derived from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 /*
   33  * In SVR4 unix domain sockets are referenced sometimes
   34  * (in putmsg(2) for example) as a [device, inode] pair instead of a pathname.
   35  * Since there is no iname() routine in the kernel, and we need access to
   36  * a mapping from inode to pathname, we keep our own table. This is a simple
   37  * linked list that contains the pathname, the [device, inode] pair, the
   38  * file corresponding to that socket and the process. When the
   39  * socket gets closed we remove the item from the list. The list gets loaded
   40  * every time a stat(2) call finds a socket.
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __FBSDID("$FreeBSD: releng/8.1/sys/compat/svr4/svr4_socket.c 193015 2009-05-29 06:04:26Z delphij $");
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/queue.h>
   49 #include <sys/eventhandler.h>
   50 #include <sys/file.h>
   51 #include <sys/kernel.h>
   52 #include <sys/lock.h>
   53 #include <sys/mutex.h>
   54 #include <sys/socket.h>
   55 #include <sys/socketvar.h>
   56 #include <sys/sysproto.h>
   57 #include <sys/un.h>
   58 #include <sys/stat.h>
   59 #include <sys/proc.h>
   60 #include <sys/malloc.h>
   61 
   62 #include <compat/svr4/svr4.h>
   63 #include <compat/svr4/svr4_types.h>
   64 #include <compat/svr4/svr4_util.h>
   65 #include <compat/svr4/svr4_socket.h>
   66 #include <compat/svr4/svr4_signal.h>
   67 #include <compat/svr4/svr4_sockmod.h>
   68 #include <compat/svr4/svr4_proto.h>
   69 
   70 struct svr4_sockcache_entry {
   71         struct proc *p;         /* Process for the socket               */
   72         void *cookie;           /* Internal cookie used for matching    */
   73         struct sockaddr_un sock;/* Pathname for the socket              */
   74         dev_t dev;              /* Device where the socket lives on     */
   75         ino_t ino;              /* Inode where the socket lives on      */
   76         TAILQ_ENTRY(svr4_sockcache_entry) entries;
   77 };
   78 
   79 static TAILQ_HEAD(, svr4_sockcache_entry) svr4_head;
   80 static struct mtx svr4_sockcache_lock;
   81 static eventhandler_tag svr4_sockcache_exit_tag, svr4_sockcache_exec_tag;
   82 
   83 static void     svr4_purge_sockcache(void *arg, struct proc *p);
   84 
   85 int
   86 svr4_find_socket(td, fp, dev, ino, saun)
   87         struct thread *td;
   88         struct file *fp;
   89         dev_t dev;
   90         ino_t ino;
   91         struct sockaddr_un *saun;
   92 {
   93         struct svr4_sockcache_entry *e;
   94         void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
   95 
   96         DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", td, dev, ino));
   97         mtx_lock(&svr4_sockcache_lock);
   98         TAILQ_FOREACH(e, &svr4_head, entries)
   99                 if (e->p == td->td_proc && e->dev == dev && e->ino == ino) {
  100 #ifdef DIAGNOSTIC
  101                         if (e->cookie != NULL && e->cookie != cookie)
  102                                 panic("svr4 socket cookie mismatch");
  103 #endif
  104                         e->cookie = cookie;
  105                         DPRINTF(("%s\n", e->sock.sun_path));
  106                         *saun = e->sock;
  107                         mtx_unlock(&svr4_sockcache_lock);
  108                         return (0);
  109                 }
  110 
  111         mtx_unlock(&svr4_sockcache_lock);
  112         DPRINTF(("not found\n"));
  113         return (ENOENT);
  114 }
  115 
  116 int
  117 svr4_add_socket(td, path, st)
  118         struct thread *td;
  119         const char *path;
  120         struct stat *st;
  121 {
  122         struct svr4_sockcache_entry *e;
  123         size_t len;
  124         int error;
  125 
  126         e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
  127         e->cookie = NULL;
  128         e->dev = st->st_dev;
  129         e->ino = st->st_ino;
  130         e->p = td->td_proc;
  131 
  132         if ((error = copyinstr(path, e->sock.sun_path,
  133             sizeof(e->sock.sun_path), &len)) != 0) {
  134                 DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
  135                 free(e, M_TEMP);
  136                 return error;
  137         }
  138 
  139         e->sock.sun_family = AF_LOCAL;
  140         e->sock.sun_len = len;
  141 
  142         mtx_lock(&svr4_sockcache_lock);
  143         TAILQ_INSERT_HEAD(&svr4_head, e, entries);
  144         mtx_unlock(&svr4_sockcache_lock);
  145         DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
  146                  td->td_proc, e->dev, e->ino));
  147         return 0;
  148 }
  149 
  150 void
  151 svr4_delete_socket(p, fp)
  152         struct proc *p;
  153         struct file *fp;
  154 {
  155         struct svr4_sockcache_entry *e;
  156         void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
  157 
  158         mtx_lock(&svr4_sockcache_lock);
  159         TAILQ_FOREACH(e, &svr4_head, entries)
  160                 if (e->p == p && e->cookie == cookie) {
  161                         TAILQ_REMOVE(&svr4_head, e, entries);
  162                         mtx_unlock(&svr4_sockcache_lock);
  163                         DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n",
  164                                  e->sock.sun_path, p, (int)e->dev, e->ino));
  165                         free(e, M_TEMP);
  166                         return;
  167                 }
  168         mtx_unlock(&svr4_sockcache_lock);
  169 }
  170 
  171 void
  172 svr4_purge_sockcache(arg, p)
  173         void *arg;
  174         struct proc *p;
  175 {
  176         struct svr4_sockcache_entry *e, *ne;
  177 
  178         mtx_lock(&svr4_sockcache_lock);
  179         TAILQ_FOREACH_SAFE(e, &svr4_head, entries, ne) {
  180                 if (e->p == p) {
  181                         TAILQ_REMOVE(&svr4_head, e, entries);
  182                         DPRINTF(("svr4_purge_sockcache: %s [%p,%d,%d]\n",
  183                                  e->sock.sun_path, p, (int)e->dev, e->ino));
  184                         free(e, M_TEMP);
  185                 }
  186         }
  187         mtx_unlock(&svr4_sockcache_lock);
  188 }
  189 
  190 void
  191 svr4_sockcache_init(void)
  192 {
  193 
  194         TAILQ_INIT(&svr4_head);
  195         mtx_init(&svr4_sockcache_lock, "svr4 socket cache", NULL, MTX_DEF);
  196         svr4_sockcache_exit_tag = EVENTHANDLER_REGISTER(process_exit,
  197             svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY);
  198         svr4_sockcache_exec_tag = EVENTHANDLER_REGISTER(process_exec,
  199             svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY);
  200 }
  201 
  202 void
  203 svr4_sockcache_destroy(void)
  204 {
  205 
  206         KASSERT(TAILQ_EMPTY(&svr4_head),
  207             ("%s: sockcache entries still around", __func__));
  208         EVENTHANDLER_DEREGISTER(process_exec, svr4_sockcache_exec_tag);
  209         EVENTHANDLER_DEREGISTER(process_exit, svr4_sockcache_exit_tag);
  210         mtx_destroy(&svr4_sockcache_lock);
  211 }
  212 
  213 int
  214 svr4_sys_socket(td, uap)
  215         struct thread *td;
  216         struct svr4_sys_socket_args *uap;
  217 {
  218         switch (uap->type) {
  219         case SVR4_SOCK_DGRAM:
  220                 uap->type = SOCK_DGRAM;
  221                 break;
  222 
  223         case SVR4_SOCK_STREAM:
  224                 uap->type = SOCK_STREAM;
  225                 break;
  226 
  227         case SVR4_SOCK_RAW:
  228                 uap->type = SOCK_RAW;
  229                 break;
  230 
  231         case SVR4_SOCK_RDM:
  232                 uap->type = SOCK_RDM;
  233                 break;
  234 
  235         case SVR4_SOCK_SEQPACKET:
  236                 uap->type = SOCK_SEQPACKET;
  237                 break;
  238         default:
  239                 return EINVAL;
  240         }
  241         return socket(td, (struct socket_args *)uap);
  242 }

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FreeBSD/Linux Kernel Cross Reference sys/compat/svr4/svr4_socket.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/svr4/svr4_socket.c