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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