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 * $FreeBSD$
32 */
33
34 /*
35 * In SVR4 unix domain sockets are referenced sometimes
36 * (in putmsg(2) for example) as a [device, inode] pair instead of a pathname.
37 * Since there is no iname() routine in the kernel, and we need access to
38 * a mapping from inode to pathname, we keep our own table. This is a simple
39 * linked list that contains the pathname, the [device, inode] pair, the
40 * file corresponding to that socket and the process. When the
41 * socket gets closed we remove the item from the list. The list gets loaded
42 * every time a stat(2) call finds a socket.
43 */
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/queue.h>
48 #include <sys/file.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/sysproto.h>
52 #include <sys/un.h>
53 #include <sys/stat.h>
54 #include <sys/proc.h>
55 #include <sys/malloc.h>
56
57 #include <svr4/svr4.h>
58 #include <svr4/svr4_types.h>
59 #include <svr4/svr4_util.h>
60 #include <svr4/svr4_socket.h>
61 #include <svr4/svr4_signal.h>
62 #include <svr4/svr4_sockmod.h>
63 #include <svr4/svr4_proto.h>
64
65 struct svr4_sockcache_entry {
66 struct proc *p; /* Process for the socket */
67 void *cookie; /* Internal cookie used for matching */
68 struct sockaddr_un sock;/* Pathname for the socket */
69 udev_t dev; /* Device where the socket lives on */
70 ino_t ino; /* Inode where the socket lives on */
71 TAILQ_ENTRY(svr4_sockcache_entry) entries;
72 };
73
74 extern TAILQ_HEAD(svr4_sockcache_head, svr4_sockcache_entry) svr4_head;
75 extern int svr4_str_initialized;
76
77 struct sockaddr_un *
78 svr4_find_socket(p, fp, dev, ino)
79 struct proc *p;
80 struct file *fp;
81 udev_t dev;
82 ino_t ino;
83 {
84 struct svr4_sockcache_entry *e;
85 void *cookie = ((struct socket *) fp->f_data)->so_emuldata;
86
87 if (!svr4_str_initialized) {
88 DPRINTF(("svr4_find_socket: uninitialized [%p,%d,%d]\n",
89 p, dev, ino));
90 TAILQ_INIT(&svr4_head);
91 svr4_str_initialized = 1;
92 return NULL;
93 }
94
95
96 DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", 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 /*
114 * svr4_delete_socket() is in sys/dev/streams.c (because it's called by
115 * the streams "soo_close()" routine).
116 */
117 int
118 svr4_add_socket(p, path, st)
119 struct proc *p;
120 const char *path;
121 struct stat *st;
122 {
123 struct svr4_sockcache_entry *e;
124 int len, error;
125
126 if (!svr4_str_initialized) {
127 TAILQ_INIT(&svr4_head);
128 svr4_str_initialized = 1;
129 }
130
131 e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
132 e->cookie = NULL;
133 e->dev = st->st_dev;
134 e->ino = st->st_ino;
135 e->p = p;
136
137 if ((error = copyinstr(path, e->sock.sun_path,
138 sizeof(e->sock.sun_path), &len)) != 0) {
139 DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
140 free(e, M_TEMP);
141 return error;
142 }
143
144 e->sock.sun_family = AF_LOCAL;
145 e->sock.sun_len = len;
146
147 TAILQ_INSERT_HEAD(&svr4_head, e, entries);
148 DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
149 p, e->dev, e->ino));
150 return 0;
151 }
152
153
154 int
155 svr4_sys_socket(p, uap)
156 struct proc *p;
157 struct svr4_sys_socket_args *uap;
158 {
159 switch (SCARG(uap, type)) {
160 case SVR4_SOCK_DGRAM:
161 SCARG(uap, type) = SOCK_DGRAM;
162 break;
163
164 case SVR4_SOCK_STREAM:
165 SCARG(uap, type) = SOCK_STREAM;
166 break;
167
168 case SVR4_SOCK_RAW:
169 SCARG(uap, type) = SOCK_RAW;
170 break;
171
172 case SVR4_SOCK_RDM:
173 SCARG(uap, type) = SOCK_RDM;
174 break;
175
176 case SVR4_SOCK_SEQPACKET:
177 SCARG(uap, type) = SOCK_SEQPACKET;
178 break;
179 default:
180 return EINVAL;
181 }
182 return socket(p, (struct socket_args *)uap);
183 }
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