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>
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71 ino_t ino;
72{
73 struct svr4_sockcache_entry *e;
74 void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
75
76 if (svr4_str_initialized != 2) {
77 if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
78 DPRINTF(("svr4_find_socket: uninitialized [%p,%d,%d]\n",
79 td, dev, ino));
80 TAILQ_INIT(&svr4_head);
81 atomic_store_rel_int(&svr4_str_initialized, 2);
82 }
83 return NULL;
84 }
85
86
87 DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", td, dev, ino));
88 TAILQ_FOREACH(e, &svr4_head, entries)
89 if (e->p == td->td_proc && e->dev == dev && e->ino == ino) {
90#ifdef DIAGNOSTIC
91 if (e->cookie != NULL && e->cookie != cookie)
92 panic("svr4 socket cookie mismatch");
93#endif
94 e->cookie = cookie;
95 DPRINTF(("%s\n", e->sock.sun_path));
96 return &e->sock;
97 }
98
99 DPRINTF(("not found\n"));
100 return NULL;
101}
102
103
104/*
105 * svr4_delete_socket() is in sys/dev/streams.c (because it's called by
106 * the streams "soo_close()" routine).
107 */
108int
109svr4_add_socket(td, path, st)
110 struct thread *td;
111 const char *path;
112 struct stat *st;
113{
114 struct svr4_sockcache_entry *e;
115 int len, error;
116
117 /*
118 * Wait for the TAILQ to be initialized. Only the very first CPU
119 * will succeed on the atomic_cmpset(). The other CPU's will spin
120 * until the first one finishes the initialization. Once the
121 * initialization is complete, the condition will always fail
122 * avoiding expensive atomic operations in the common case.
123 */
124 while (svr4_str_initialized != 2)
125 if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
126 TAILQ_INIT(&svr4_head);
127 atomic_store_rel_int(&svr4_str_initialized, 2);
128 }
129
130 e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
131 e->cookie = NULL;
132 e->dev = st->st_dev;
133 e->ino = st->st_ino;
134 e->p = td->td_proc;
135
136 if ((error = copyinstr(path, e->sock.sun_path,
137 sizeof(e->sock.sun_path), &len)) != 0) {
138 DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
139 free(e, M_TEMP);
140 return error;
141 }
142
143 e->sock.sun_family = AF_LOCAL;
144 e->sock.sun_len = len;
145
146 TAILQ_INSERT_HEAD(&svr4_head, e, entries);
147 DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
148 td->td_proc, e->dev, e->ino));
149 return 0;
150}
151
152
153int
154svr4_sys_socket(td, uap)
155 struct thread *td;
156 struct svr4_sys_socket_args *uap;
157{
158 switch (uap->type) {
159 case SVR4_SOCK_DGRAM:
160 uap->type = SOCK_DGRAM;
161 break;
162
163 case SVR4_SOCK_STREAM:
164 uap->type = SOCK_STREAM;
165 break;
166
167 case SVR4_SOCK_RAW:
168 uap->type = SOCK_RAW;
169 break;
170
171 case SVR4_SOCK_RDM:
172 uap->type = SOCK_RDM;
173 break;
174
175 case SVR4_SOCK_SEQPACKET:
176 uap->type = SOCK_SEQPACKET;
177 break;
178 default:
179 return EINVAL;
180 }
181 return socket(td, (struct socket_args *)uap);
182}
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