The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/svr4/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/11.2/sys/compat/svr4/svr4_socket.c 298519 2016-04-23 20:29:55Z 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,%ju,%ju]: ", td, (uintmax_t)dev,
   98             (uintmax_t)ino));
   99         mtx_lock(&svr4_sockcache_lock);
  100         TAILQ_FOREACH(e, &svr4_head, entries)
  101                 if (e->p == td->td_proc && e->dev == dev && e->ino == ino) {
  102 #ifdef DIAGNOSTIC
  103                         if (e->cookie != NULL && e->cookie != cookie)
  104                                 panic("svr4 socket cookie mismatch");
  105 #endif
  106                         e->cookie = cookie;
  107                         DPRINTF(("%s\n", e->sock.sun_path));
  108                         *saun = e->sock;
  109                         mtx_unlock(&svr4_sockcache_lock);
  110                         return (0);
  111                 }
  112 
  113         mtx_unlock(&svr4_sockcache_lock);
  114         DPRINTF(("not found\n"));
  115         return (ENOENT);
  116 }
  117 
  118 int
  119 svr4_add_socket(td, path, st)
  120         struct thread *td;
  121         const char *path;
  122         struct stat *st;
  123 {
  124         struct svr4_sockcache_entry *e;
  125         size_t len;
  126         int error;
  127 
  128         e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
  129         e->cookie = NULL;
  130         e->dev = st->st_dev;
  131         e->ino = st->st_ino;
  132         e->p = td->td_proc;
  133 
  134         if ((error = copyinstr(path, e->sock.sun_path,
  135             sizeof(e->sock.sun_path), &len)) != 0) {
  136                 DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
  137                 free(e, M_TEMP);
  138                 return error;
  139         }
  140 
  141         e->sock.sun_family = AF_LOCAL;
  142         e->sock.sun_len = len;
  143 
  144         mtx_lock(&svr4_sockcache_lock);
  145         TAILQ_INSERT_HEAD(&svr4_head, e, entries);
  146         mtx_unlock(&svr4_sockcache_lock);
  147         DPRINTF(("svr4_add_socket: %s [%p,%ju,%ju]\n", e->sock.sun_path,
  148                  td->td_proc, (uintmax_t)e->dev, (uintmax_t)e->ino));
  149         return 0;
  150 }
  151 
  152 void
  153 svr4_delete_socket(p, fp)
  154         struct proc *p;
  155         struct file *fp;
  156 {
  157         struct svr4_sockcache_entry *e;
  158         void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
  159 
  160         mtx_lock(&svr4_sockcache_lock);
  161         TAILQ_FOREACH(e, &svr4_head, entries)
  162                 if (e->p == p && e->cookie == cookie) {
  163                         TAILQ_REMOVE(&svr4_head, e, entries);
  164                         mtx_unlock(&svr4_sockcache_lock);
  165                         DPRINTF(("svr4_delete_socket: %s [%p,%ju,%ju]\n",
  166                                  e->sock.sun_path, p, (uintmax_t)e->dev,
  167                                  (uintmax_t)e->ino));
  168                         free(e, M_TEMP);
  169                         return;
  170                 }
  171         mtx_unlock(&svr4_sockcache_lock);
  172 }
  173 
  174 struct svr4_strm *
  175 svr4_stream_get(fp)
  176         struct file *fp;
  177 {
  178         struct socket *so;
  179 
  180         if (fp == NULL || fp->f_type != DTYPE_SOCKET)
  181                 return NULL;
  182 
  183         so = fp->f_data;
  184         return so->so_emuldata;
  185 }
  186 
  187 void
  188 svr4_purge_sockcache(arg, p)
  189         void *arg;
  190         struct proc *p;
  191 {
  192         struct svr4_sockcache_entry *e, *ne;
  193 
  194         mtx_lock(&svr4_sockcache_lock);
  195         TAILQ_FOREACH_SAFE(e, &svr4_head, entries, ne) {
  196                 if (e->p == p) {
  197                         TAILQ_REMOVE(&svr4_head, e, entries);
  198                         DPRINTF(("svr4_purge_sockcache: %s [%p,%ju,%ju]\n",
  199                                  e->sock.sun_path, p, (uintmax_t)e->dev,
  200                                  (uintmax_t)e->ino));
  201                         free(e, M_TEMP);
  202                 }
  203         }
  204         mtx_unlock(&svr4_sockcache_lock);
  205 }
  206 
  207 void
  208 svr4_sockcache_init(void)
  209 {
  210 
  211         TAILQ_INIT(&svr4_head);
  212         mtx_init(&svr4_sockcache_lock, "svr4 socket cache", NULL, MTX_DEF);
  213         svr4_sockcache_exit_tag = EVENTHANDLER_REGISTER(process_exit,
  214             svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY);
  215         svr4_sockcache_exec_tag = EVENTHANDLER_REGISTER(process_exec,
  216             svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY);
  217 }
  218 
  219 void
  220 svr4_sockcache_destroy(void)
  221 {
  222 
  223         KASSERT(TAILQ_EMPTY(&svr4_head),
  224             ("%s: sockcache entries still around", __func__));
  225         EVENTHANDLER_DEREGISTER(process_exec, svr4_sockcache_exec_tag);
  226         EVENTHANDLER_DEREGISTER(process_exit, svr4_sockcache_exit_tag);
  227         mtx_destroy(&svr4_sockcache_lock);
  228 }
  229 
  230 int
  231 svr4_sys_socket(td, uap)
  232         struct thread *td;
  233         struct svr4_sys_socket_args *uap;
  234 {
  235         switch (uap->type) {
  236         case SVR4_SOCK_DGRAM:
  237                 uap->type = SOCK_DGRAM;
  238                 break;
  239 
  240         case SVR4_SOCK_STREAM:
  241                 uap->type = SOCK_STREAM;
  242                 break;
  243 
  244         case SVR4_SOCK_RAW:
  245                 uap->type = SOCK_RAW;
  246                 break;
  247 
  248         case SVR4_SOCK_RDM:
  249                 uap->type = SOCK_RDM;
  250                 break;
  251 
  252         case SVR4_SOCK_SEQPACKET:
  253                 uap->type = SOCK_SEQPACKET;
  254                 break;
  255         default:
  256                 return EINVAL;
  257         }
  258         return sys_socket(td, (struct socket_args *)uap);
  259 }

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