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: stable/10/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
svr4_find_socket(td,fp,dev,ino,saun)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
svr4_add_socket(td,path,st)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
svr4_delete_socket(p,fp)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 *
svr4_stream_get(fp)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
svr4_purge_sockcache(arg,p)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
svr4_sockcache_init(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
svr4_sockcache_destroy(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
svr4_sys_socket(td,uap)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 }
257