sys/compat/svr4/svr4_socket.c

   1 /*      $NetBSD: svr4_socket.c,v 1.21 2008/06/18 02:08:36 dogcow Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1996, 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * 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 __KERNEL_RCSID(0, "$NetBSD: svr4_socket.c,v 1.21 2008/06/18 02:08:36 dogcow Exp $");
  45
  46 #include <sys/param.h>
  47 #include <sys/kernel.h>
  48 #include <sys/systm.h>
  49 #include <sys/queue.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/file.h>
  52 #include <sys/mount.h>
  53 #include <sys/sched.h>
  54 #include <sys/socket.h>
  55 #include <sys/socketvar.h>
  56 #include <sys/syscallargs.h>
  57 #include <sys/un.h>
  58 #include <sys/stat.h>
  59
  60 #include <compat/svr4/svr4_types.h>
  61 #include <compat/svr4/svr4_util.h>
  62 #include <compat/svr4/svr4_socket.h>
  63 #include <compat/svr4/svr4_signal.h>
  64 #include <compat/svr4/svr4_sockmod.h>
  65 #include <compat/svr4/svr4_lwp.h>
  66 #include <compat/svr4/svr4_ucontext.h>
  67 #include <compat/svr4/svr4_syscallargs.h>
  68
  69 struct svr4_sockcache_entry {
  70         struct proc *p;         /* Process for the socket               */
  71         void *cookie;           /* Internal cookie used for matching    */
  72         struct sockaddr_un sock;/* Pathname for the socket              */
  73         dev_t dev;              /* Device where the socket lives on     */
  74         svr4_ino_t ino;         /* Inode where the socket lives on      */
  75         TAILQ_ENTRY(svr4_sockcache_entry) entries;
  76 };
  77
  78 static TAILQ_HEAD(svr4_sockcache_head, svr4_sockcache_entry) svr4_head;
  79 static int initialized = 0;
  80
  81 struct sockaddr_un *
  82 svr4_find_socket(struct proc *p, struct file *fp, dev_t dev, svr4_ino_t ino)
  83 {
  84         struct svr4_sockcache_entry *e;
  85         void *cookie = ((struct socket *) fp->f_data)->so_internal;
  86
  87         if (!initialized) {
  88                 DPRINTF(("svr4_find_socket: uninitialized [%p,%"PRId64",%lu]\n",
  89                     p, dev, ino));
  90                 TAILQ_INIT(&svr4_head);
  91                 initialized = 1;
  92                 return NULL;
  93         }
  94
  95
  96         DPRINTF(("svr4_find_socket: [%p,%"PRId64",%lu]: ", p, dev, ino));
  97         for (e = svr4_head.tqh_first; e != NULL; e = e->entries.tqe_next)
  98                 if (e->p == p && e->dev == dev && e->ino == ino) {
  99 #ifdef DIAGNOSTIC
 100                         if (e->cookie != NULL && e->cookie != cookie)
 101                                 panic("svr4 socket cookie mismatch");
 102 #endif
 103                         e->cookie = cookie;
 104                         DPRINTF(("%s\n", e->sock.sun_path));
 105                         return &e->sock;
 106                 }
 107
 108         DPRINTF(("not found\n"));
 109         return NULL;
 110 }
 111
 112
 113 void
 114 svr4_delete_socket(struct proc *p, struct file *fp)
 115 {
 116         struct svr4_sockcache_entry *e;
 117         void *cookie = ((struct socket *) fp->f_data)->so_internal;
 118
 119         KERNEL_LOCK(1, NULL);
 120
 121         if (!initialized) {
 122                 TAILQ_INIT(&svr4_head);
 123                 initialized = 1;
 124                 KERNEL_UNLOCK_ONE(NULL);
 125                 return;
 126         }
 127
 128         for (e = svr4_head.tqh_first; e != NULL; e = e->entries.tqe_next)
 129                 if (e->p == p && e->cookie == cookie) {
 130                         TAILQ_REMOVE(&svr4_head, e, entries);
 131                         DPRINTF(("svr4_delete_socket: %s [%p,%"PRId64",%lu]\n",
 132                                  e->sock.sun_path, p, e->dev, e->ino));
 133                         free(e, M_TEMP);
 134                         break;
 135                 }
 136
 137         KERNEL_UNLOCK_ONE(NULL);
 138 }
 139
 140
 141 int
 142 svr4_add_socket(struct proc *p, const char *path, struct stat *st)
 143 {
 144         struct svr4_sockcache_entry *e;
 145         size_t len;
 146         int error;
 147
 148         KERNEL_LOCK(1, NULL);
 149
 150         if (!initialized) {
 151                 TAILQ_INIT(&svr4_head);
 152                 initialized = 1;
 153         }
 154
 155         e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
 156         e->cookie = NULL;
 157         e->dev = st->st_dev;
 158         e->ino = st->st_ino;
 159         e->p = p;
 160
 161         if ((error = copyinstr(path, e->sock.sun_path,
 162             sizeof(e->sock.sun_path), &len)) != 0) {
 163                 DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
 164                 free(e, M_TEMP);
 165                 KERNEL_UNLOCK_ONE(NULL);
 166                 return error;
 167         }
 168
 169         e->sock.sun_family = AF_LOCAL;
 170         e->sock.sun_len = len;
 171
 172         TAILQ_INSERT_HEAD(&svr4_head, e, entries);
 173         DPRINTF(("svr4_add_socket: %s [%p,%"PRId64",%lu]\n", e->sock.sun_path,
 174                  p, e->dev, e->ino));
 175
 176         KERNEL_UNLOCK_ONE(NULL);
 177         return 0;
 178 }
 179
 180
 181 int
 182 svr4_sys_socket(struct lwp *l, const struct svr4_sys_socket_args *uap, register_t *retval)
 183 {
 184         struct sys___socket30_args bsd_ua;
 185
 186         SCARG(&bsd_ua, domain) = SCARG(uap, domain);
 187         SCARG(&bsd_ua, protocol) = SCARG(uap, protocol);
 188
 189         switch (SCARG(uap, type)) {
 190         case SVR4_SOCK_DGRAM:
 191                 SCARG(&bsd_ua, type) = SOCK_DGRAM;
 192                 break;
 193
 194         case SVR4_SOCK_STREAM:
 195                 SCARG(&bsd_ua, type) = SOCK_STREAM;
 196                 break;
 197
 198         case SVR4_SOCK_RAW:
 199                 SCARG(&bsd_ua, type) = SOCK_RAW;
 200                 break;
 201
 202         case SVR4_SOCK_RDM:
 203                 SCARG(&bsd_ua, type) = SOCK_RDM;
 204                 break;
 205
 206         case SVR4_SOCK_SEQPACKET:
 207                 SCARG(&bsd_ua, type) = SOCK_SEQPACKET;
 208                 break;
 209         default:
 210                 return EINVAL;
 211         }
 212         return sys___socket30(l, &bsd_ua, retval);
 213 }