svr4_socket.c revision 52333 
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: head/sys/compat/svr4/svr4_socket.c 52333 1999-10-17 14:44:48Z newton $
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/kernel.h>
47#include <sys/systm.h>
48#include <sys/queue.h>
49#include <sys/file.h>
50#include <sys/socket.h>
51#include <sys/socketvar.h>
52#include <sys/sysproto.h>
53#include <sys/un.h>
54#include <sys/stat.h>
55#include <sys/proc.h>
56#include <sys/malloc.h>
57
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
65struct 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
74extern TAILQ_HEAD(svr4_sockcache_head, svr4_sockcache_entry) svr4_head;
75extern int svr4_str_initialized;
76
77struct sockaddr_un *
78svr4_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
113void
114svr4_delete_socket(p, fp)
115	struct proc *p;
116	struct file *fp;
117{
118	struct svr4_sockcache_entry *e;
119	void *cookie = ((struct socket *) fp->f_data)->so_emuldata;
120
121	if (!svr4_str_initialized) {
122		TAILQ_INIT(&svr4_head);
123		svr4_str_initialized = 1;
124		return;
125	}
126
127	for (e = svr4_head.tqh_first; e != NULL; e = e->entries.tqe_next)
128		if (e->p == p && e->cookie == cookie) {
129			TAILQ_REMOVE(&svr4_head, e, entries);
130			DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n",
131				 e->sock.sun_path, p, e->dev, e->ino));
132			free(e, M_TEMP);
133			return;
134		}
135}
136
137
138int
139svr4_add_socket(p, path, st)
140	struct proc *p;
141	const char *path;
142	struct stat *st;
143{
144	struct svr4_sockcache_entry *e;
145	int len, error;
146
147	if (!svr4_str_initialized) {
148		TAILQ_INIT(&svr4_head);
149		svr4_str_initialized = 1;
150	}
151
152	e = malloc(sizeof(*e), M_TEMP, M_WAITOK);
153	e->cookie = NULL;
154	e->dev = st->st_dev;
155	e->ino = st->st_ino;
156	e->p = p;
157
158	if ((error = copyinstr(path, e->sock.sun_path,
159	    sizeof(e->sock.sun_path), &len)) != 0) {
160		DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error));
161		free(e, M_TEMP);
162		return error;
163	}
164
165	e->sock.sun_family = AF_LOCAL;
166	e->sock.sun_len = len;
167
168	TAILQ_INSERT_HEAD(&svr4_head, e, entries);
169	DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path,
170		 p, e->dev, e->ino));
171	return 0;
172}
173
174
175int
176svr4_sys_socket(p, uap)
177	struct proc *p;
178	struct svr4_sys_socket_args *uap;
179{
180	switch (SCARG(uap, type)) {
181	case SVR4_SOCK_DGRAM:
182		SCARG(uap, type) = SOCK_DGRAM;
183		break;
184
185	case SVR4_SOCK_STREAM:
186		SCARG(uap, type) = SOCK_STREAM;
187		break;
188
189	case SVR4_SOCK_RAW:
190		SCARG(uap, type) = SOCK_RAW;
191		break;
192
193	case SVR4_SOCK_RDM:
194		SCARG(uap, type) = SOCK_RDM;
195		break;
196
197	case SVR4_SOCK_SEQPACKET:
198		SCARG(uap, type) = SOCK_SEQPACKET;
199		break;
200	default:
201		return EINVAL;
202	}
203	return socket(p, (struct socket_args *)uap);
204}
205