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  * $FreeBSD: releng/5.0/sys/compat/svr4/svr4_socket.c 108086 2002-12-19 09:40:13Z alfred $
   32  */
   33 
   34 /*
   35  * In SVR4 unix domain sockets are referenced sometimes
   36  * (in putmsg(2) for example) as a [device, inode] pair instead of a pathname.
   37  * Since there is no iname() routine in the kernel, and we need access to
   38  * a mapping from inode to pathname, we keep our own table. This is a simple
   39  * linked list that contains the pathname, the [device, inode] pair, the
   40  * file corresponding to that socket and the process. When the
   41  * socket gets closed we remove the item from the list. The list gets loaded
   42  * every time a stat(2) call finds a socket.
   43  */
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/queue.h>
   48 #include <sys/file.h>
   49 #include <sys/socket.h>
   50 #include <sys/socketvar.h>
   51 #include <sys/sysproto.h>
   52 #include <sys/un.h>
   53 #include <sys/stat.h>
   54 #include <sys/proc.h>
   55 #include <sys/malloc.h>
   56 
   57 #include <compat/svr4/svr4.h>
   58 #include <compat/svr4/svr4_types.h>
   59 #include <compat/svr4/svr4_util.h>
   60 #include <compat/svr4/svr4_socket.h>
   61 #include <compat/svr4/svr4_signal.h>
   62 #include <compat/svr4/svr4_sockmod.h>
   63 #include <compat/svr4/svr4_proto.h>
   64 
   65 struct svr4_sockcache_entry {
   66         struct proc *p;         /* Process for the socket               */
   67         void *cookie;           /* Internal cookie used for matching    */
   68         struct sockaddr_un sock;/* Pathname for the socket              */
   69         udev_t dev;             /* Device where the socket lives on     */
   70         ino_t ino;              /* Inode where the socket lives on      */
   71         TAILQ_ENTRY(svr4_sockcache_entry) entries;
   72 };
   73 
   74 extern TAILQ_HEAD(svr4_sockcache_head, svr4_sockcache_entry) svr4_head;
   75 extern int svr4_str_initialized;
   76 
   77 struct sockaddr_un *
   78 svr4_find_socket(td, fp, dev, ino)
   79         struct thread *td;
   80         struct file *fp;
   81         udev_t dev;
   82         ino_t ino;
   83 {
   84         struct svr4_sockcache_entry *e;
   85         void *cookie = ((struct socket *) fp->f_data)->so_emuldata;
   86 
   87         if (svr4_str_initialized != 2) {
   88                 if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
   89                         DPRINTF(("svr4_find_socket: uninitialized [%p,%d,%d]\n",
   90                             td, dev, ino));
   91                         TAILQ_INIT(&svr4_head);
   92                         atomic_store_rel_int(&svr4_str_initialized, 2);
   93                 }
   94                 return NULL;
   95         }
   96 
   97 
   98         DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", td, dev, ino));
   99         TAILQ_FOREACH(e, &svr4_head, entries)
  100                 if (e->p == td->td_proc && e->dev == dev && e->ino == ino) {
  101 #ifdef DIAGNOSTIC
  102                         if (e->cookie != NULL && e->cookie != cookie)
  103                                 panic("svr4 socket cookie mismatch");
  104 #endif
  105                         e->cookie = cookie;
  106                         DPRINTF(("%s\n", e->sock.sun_path));
  107                         return &e->sock;
  108                 }
  109 
  110         DPRINTF(("not found\n"));
  111         return NULL;
  112 }
  113 
  114 
  115 /*
  116  * svr4_delete_socket() is in sys/dev/streams.c (because it's called by
  117  * the streams "soo_close()" routine).
  118  */
  119 int
  120 svr4_add_socket(td, path, st)
  121         struct thread *td;
  122         const char *path;
  123         struct stat *st;
  124 {
  125         struct svr4_sockcache_entry *e;
  126         int len, error;
  127 
  128         /*
  129          * Wait for the TAILQ to be initialized.  Only the very first CPU
  130          * will succeed on the atomic_cmpset().  The other CPU's will spin
  131          * until the first one finishes the initialization.  Once the
  132          * initialization is complete, the condition will always fail
  133          * avoiding expensive atomic operations in the common case.
  134          */
  135         while (svr4_str_initialized != 2)
  136                 if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
  137                         TAILQ_INIT(&svr4_head);
  138                         atomic_store_rel_int(&svr4_str_initialized, 2);
  139                 }
  140 
  141         e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
  142         e->cookie = NULL;
  143         e->dev = st->st_dev;
  144         e->ino = st->st_ino;
  145         e->p = td->td_proc;
  146 
  147         if ((error = copyinstr(path, e->sock.sun_path,
  148             sizeof(e->sock.sun_path), &len)) != 0) {
  149                 DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
  150                 free(e, M_TEMP);
  151                 return error;
  152         }
  153 
  154         e->sock.sun_family = AF_LOCAL;
  155         e->sock.sun_len = len;
  156 
  157         TAILQ_INSERT_HEAD(&svr4_head, e, entries);
  158         DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
  159                  td->td_proc, e->dev, e->ino));
  160         return 0;
  161 }
  162 
  163 
  164 int
  165 svr4_sys_socket(td, uap)
  166         struct thread *td;
  167         struct svr4_sys_socket_args *uap;
  168 {
  169         switch (uap->type) {
  170         case SVR4_SOCK_DGRAM:
  171                 uap->type = SOCK_DGRAM;
  172                 break;
  173 
  174         case SVR4_SOCK_STREAM:
  175                 uap->type = SOCK_STREAM;
  176                 break;
  177 
  178         case SVR4_SOCK_RAW:
  179                 uap->type = SOCK_RAW;
  180                 break;
  181 
  182         case SVR4_SOCK_RDM:
  183                 uap->type = SOCK_RDM;
  184                 break;
  185 
  186         case SVR4_SOCK_SEQPACKET:
  187                 uap->type = SOCK_SEQPACKET;
  188                 break;
  189         default:
  190                 return EINVAL;
  191         }
  192         return socket(td, (struct socket_args *)uap);
  193 }

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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