svr4_socket.c revision 193015
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: head/sys/compat/svr4/svr4_socket.c 193015 2009-05-29 06:04:26Z delphij $"); 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 70struct svr4_sockcache_entry { 71 struct proc *p; /* Process for the socket */ 72 void *cookie; /* Internal cookie used for matching */ 73 struct sockaddr_un sock;/* Pathname for the socket */ 74 dev_t dev; /* Device where the socket lives on */ 75 ino_t ino; /* Inode where the socket lives on */ 76 TAILQ_ENTRY(svr4_sockcache_entry) entries; 77}; 78 79static TAILQ_HEAD(, svr4_sockcache_entry) svr4_head; 80static struct mtx svr4_sockcache_lock; 81static eventhandler_tag svr4_sockcache_exit_tag, svr4_sockcache_exec_tag; 82 83static void svr4_purge_sockcache(void *arg, struct proc *p); 84 85int 86svr4_find_socket(td, fp, dev, ino, saun) 87 struct thread *td; 88 struct file *fp; 89 dev_t dev; 90 ino_t ino; 91 struct sockaddr_un *saun; 92{ 93 struct svr4_sockcache_entry *e; 94 void *cookie = ((struct socket *)fp->f_data)->so_emuldata; 95 96 DPRINTF(("svr4_find_socket: [%p,%d,%d]: ", td, dev, ino)); 97 mtx_lock(&svr4_sockcache_lock); 98 TAILQ_FOREACH(e, &svr4_head, entries) 99 if (e->p == td->td_proc && e->dev == dev && e->ino == ino) { 100#ifdef DIAGNOSTIC 101 if (e->cookie != NULL && e->cookie != cookie) 102 panic("svr4 socket cookie mismatch"); 103#endif 104 e->cookie = cookie; 105 DPRINTF(("%s\n", e->sock.sun_path)); 106 *saun = e->sock; 107 mtx_unlock(&svr4_sockcache_lock); 108 return (0); 109 } 110 111 mtx_unlock(&svr4_sockcache_lock); 112 DPRINTF(("not found\n")); 113 return (ENOENT); 114} 115 116int 117svr4_add_socket(td, path, st) 118 struct thread *td; 119 const char *path; 120 struct stat *st; 121{ 122 struct svr4_sockcache_entry *e; 123 size_t len; 124 int error; 125 126 e = malloc(sizeof(*e), M_TEMP, M_WAITOK); 127 e->cookie = NULL; 128 e->dev = st->st_dev; 129 e->ino = st->st_ino; 130 e->p = td->td_proc; 131 132 if ((error = copyinstr(path, e->sock.sun_path, 133 sizeof(e->sock.sun_path), &len)) != 0) { 134 DPRINTF(("svr4_add_socket: copyinstr failed %d\n", error)); 135 free(e, M_TEMP); 136 return error; 137 } 138 139 e->sock.sun_family = AF_LOCAL; 140 e->sock.sun_len = len; 141 142 mtx_lock(&svr4_sockcache_lock); 143 TAILQ_INSERT_HEAD(&svr4_head, e, entries); 144 mtx_unlock(&svr4_sockcache_lock); 145 DPRINTF(("svr4_add_socket: %s [%p,%d,%d]\n", e->sock.sun_path, 146 td->td_proc, e->dev, e->ino)); 147 return 0; 148} 149 150void 151svr4_delete_socket(p, fp) 152 struct proc *p; 153 struct file *fp; 154{ 155 struct svr4_sockcache_entry *e; 156 void *cookie = ((struct socket *)fp->f_data)->so_emuldata; 157 158 mtx_lock(&svr4_sockcache_lock); 159 TAILQ_FOREACH(e, &svr4_head, entries) 160 if (e->p == p && e->cookie == cookie) { 161 TAILQ_REMOVE(&svr4_head, e, entries); 162 mtx_unlock(&svr4_sockcache_lock); 163 DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n", 164 e->sock.sun_path, p, (int)e->dev, e->ino)); 165 free(e, M_TEMP); 166 return; 167 } 168 mtx_unlock(&svr4_sockcache_lock); 169} 170 171void 172svr4_purge_sockcache(arg, p) 173 void *arg; 174 struct proc *p; 175{ 176 struct svr4_sockcache_entry *e, *ne; 177 178 mtx_lock(&svr4_sockcache_lock); 179 TAILQ_FOREACH_SAFE(e, &svr4_head, entries, ne) { 180 if (e->p == p) { 181 TAILQ_REMOVE(&svr4_head, e, entries); 182 DPRINTF(("svr4_purge_sockcache: %s [%p,%d,%d]\n", 183 e->sock.sun_path, p, (int)e->dev, e->ino)); 184 free(e, M_TEMP); 185 } 186 } 187 mtx_unlock(&svr4_sockcache_lock); 188} 189 190void 191svr4_sockcache_init(void) 192{ 193 194 TAILQ_INIT(&svr4_head); 195 mtx_init(&svr4_sockcache_lock, "svr4 socket cache", NULL, MTX_DEF); 196 svr4_sockcache_exit_tag = EVENTHANDLER_REGISTER(process_exit, 197 svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY); 198 svr4_sockcache_exec_tag = EVENTHANDLER_REGISTER(process_exec, 199 svr4_purge_sockcache, NULL, EVENTHANDLER_PRI_ANY); 200} 201 202void 203svr4_sockcache_destroy(void) 204{ 205 206 KASSERT(TAILQ_EMPTY(&svr4_head), 207 ("%s: sockcache entries still around", __func__)); 208 EVENTHANDLER_DEREGISTER(process_exec, svr4_sockcache_exec_tag); 209 EVENTHANDLER_DEREGISTER(process_exit, svr4_sockcache_exit_tag); 210 mtx_destroy(&svr4_sockcache_lock); 211} 212 213int 214svr4_sys_socket(td, uap) 215 struct thread *td; 216 struct svr4_sys_socket_args *uap; 217{ 218 switch (uap->type) { 219 case SVR4_SOCK_DGRAM: 220 uap->type = SOCK_DGRAM; 221 break; 222 223 case SVR4_SOCK_STREAM: 224 uap->type = SOCK_STREAM; 225 break; 226 227 case SVR4_SOCK_RAW: 228 uap->type = SOCK_RAW; 229 break; 230 231 case SVR4_SOCK_RDM: 232 uap->type = SOCK_RDM; 233 break; 234 235 case SVR4_SOCK_SEQPACKET: 236 uap->type = SOCK_SEQPACKET; 237 break; 238 default: 239 return EINVAL; 240 } 241 return socket(td, (struct socket_args *)uap); 242} 243