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/10.4/sys/compat/svr4/svr4_socket.c 299215 2016-05-07 08:30:21Z dchagin $");
   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 #include <compat/svr4/svr4_stropts.h>
   70 
   71 struct svr4_sockcache_entry {
   72         struct proc *p;         /* Process for the socket               */
   73         void *cookie;           /* Internal cookie used for matching    */
   74         struct sockaddr_un sock;/* Pathname for the socket              */
   75         dev_t dev;              /* Device where the socket lives on     */
   76         ino_t ino;              /* Inode where the socket lives on      */
   77         TAILQ_ENTRY(svr4_sockcache_entry) entries;
   78 };
   79 
   80 static TAILQ_HEAD(, svr4_sockcache_entry) svr4_head;
   81 static struct mtx svr4_sockcache_lock;
   82 static eventhandler_tag svr4_sockcache_exit_tag, svr4_sockcache_exec_tag;
   83 
   84 static void     svr4_purge_sockcache(void *arg, struct proc *p);
   85 
   86 int
   87 svr4_find_socket(td, fp, dev, ino, saun)
   88         struct thread *td;
   89         struct file *fp;
   90         dev_t dev;
   91         ino_t ino;
   92         struct sockaddr_un *saun;
   93 {
   94         struct svr4_sockcache_entry *e;
   95         void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
   96 
   97         DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", td, dev, ino));
   98         mtx_lock(&svr4_sockcache_lock);
   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                         *saun = e->sock;
  108                         mtx_unlock(&svr4_sockcache_lock);
  109                         return (0);
  110                 }
  111 
  112         mtx_unlock(&svr4_sockcache_lock);
  113         DPRINTF(("not found\n"));
  114         return (ENOENT);
  115 }
  116 
  117 int
  118 svr4_add_socket(td, path, st)
  119         struct thread *td;
  120         const char *path;
  121         struct stat *st;
  122 {
  123         struct svr4_sockcache_entry *e;
  124         size_t len;
  125         int error;
  126 
  127         e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
  128         e->cookie = NULL;
  129         e->dev = st->st_dev;
  130         e->ino = st->st_ino;
  131         e->p = td->td_proc;
  132 
  133         if ((error = copyinstr(path, e->sock.sun_path,
  134             sizeof(e->sock.sun_path), &len)) != 0) {
  135                 DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
  136                 free(e, M_TEMP);
  137                 return error;
  138         }
  139 
  140         e->sock.sun_family = AF_LOCAL;
  141         e->sock.sun_len = len;
  142 
  143         mtx_lock(&svr4_sockcache_lock);
  144         TAILQ_INSERT_HEAD(&svr4_head, e, entries);
  145         mtx_unlock(&svr4_sockcache_lock);
  146         DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
  147                  td->td_proc, e->dev, e->ino));
  148         return 0;
  149 }
  150 
  151 void
  152 svr4_delete_socket(p, fp)
  153         struct proc *p;
  154         struct file *fp;
  155 {
  156         struct svr4_sockcache_entry *e;
  157         void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
  158 
  159         mtx_lock(&svr4_sockcache_lock);
  160         TAILQ_FOREACH(e, &svr4_head, entries)
  161                 if (e->p == p && e->cookie == cookie) {
  162                         TAILQ_REMOVE(&svr4_head, e, entries);
  163                         mtx_unlock(&svr4_sockcache_lock);
  164                         DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n",
  165                                  e->sock.sun_path, p, (int)e->dev, e->ino));
  166                         free(e, M_TEMP);
  167                         return;
  168                 }
  169         mtx_unlock(&svr4_sockcache_lock);
  170 }
  171 
  172 struct svr4_strm *
  173 svr4_stream_get(fp)
  174         struct file *fp;
  175 {
  176         struct socket *so;
  177 
  178         if (fp == NULL || fp->f_type != DTYPE_SOCKET)
  179                 return NULL;
  180 
  181         so = fp->f_data;
  182         return so->so_emuldata;
  183 }
  184 
  185 void
  186 svr4_purge_sockcache(arg, p)
  187         void *arg;
  188         struct proc *p;
  189 {
  190         struct svr4_sockcache_entry *e, *ne;
  191 
  192         mtx_lock(&svr4_sockcache_lock);
  193         TAILQ_FOREACH_SAFE(e, &svr4_head, entries, ne) {
  194                 if (e->p == p) {
  195                         TAILQ_REMOVE(&svr4_head, e, entries);
  196                         DPRINTF(("svr4_purge_sockcache: %s [%p,%d,%d]\n",
  197                                  e->sock.sun_path, p, (int)e->dev, e->ino));
  198                         free(e, M_TEMP);
  199                 }
  200         }
  201         mtx_unlock(&svr4_sockcache_lock);
  202 }
  203 
  204 void
  205 svr4_sockcache_init(void)
  206 {
  207 
  208         TAILQ_INIT(&svr4_head);
  209         mtx_init(&svr4_sockcache_lock, "svr4 socket cache", NULL, MTX_DEF);
  210         svr4_sockcache_exit_tag = EVENTHANDLER_REGISTER(process_exit,
  211             svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY);
  212         svr4_sockcache_exec_tag = EVENTHANDLER_REGISTER(process_exec,
  213             svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY);
  214 }
  215 
  216 void
  217 svr4_sockcache_destroy(void)
  218 {
  219 
  220         KASSERT(TAILQ_EMPTY(&svr4_head),
  221             ("%s: sockcache entries still around", __func__));
  222         EVENTHANDLER_DEREGISTER(process_exec, svr4_sockcache_exec_tag);
  223         EVENTHANDLER_DEREGISTER(process_exit, svr4_sockcache_exit_tag);
  224         mtx_destroy(&svr4_sockcache_lock);
  225 }
  226 
  227 int
  228 svr4_sys_socket(td, uap)
  229         struct thread *td;
  230         struct svr4_sys_socket_args *uap;
  231 {
  232         switch (uap->type) {
  233         case SVR4_SOCK_DGRAM:
  234                 uap->type = SOCK_DGRAM;
  235                 break;
  236 
  237         case SVR4_SOCK_STREAM:
  238                 uap->type = SOCK_STREAM;
  239                 break;
  240 
  241         case SVR4_SOCK_RAW:
  242                 uap->type = SOCK_RAW;
  243                 break;
  244 
  245         case SVR4_SOCK_RDM:
  246                 uap->type = SOCK_RDM;
  247                 break;
  248 
  249         case SVR4_SOCK_SEQPACKET:
  250                 uap->type = SOCK_SEQPACKET;
  251                 break;
  252         default:
  253                 return EINVAL;
  254         }
  255         return sys_socket(td, (struct socket_args *)uap);
  256 }

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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