1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34 #pragma ident "%Z%%M% %I% %E% SMI"
35
36 /*
37 * This module provides the user level support for the NFSv4
38 * callback program. It is modeled after nfsd. When a nfsv4
39 * mount occurs, the mount command forks and the child runs
40 * start_nfs4_callback. If this is the first mount, then the
41 * process will hang around listening for incoming connection
42 * requests from the nfsv4 server.
43 *
44 * For connection-less protocols, the krpc is started immediately.
45 * For connection oriented protocols, the kernel module is informed
46 * of netid and universal address that it can give this
47 * information to the server during setclientid.
48 */
49
50 #include <sys/param.h>
51 #include <sys/types.h>
52 #include <syslog.h>
53 #include <tiuser.h>
54 #include <rpc/rpc.h>
55 #include <errno.h>
56 #include <thread.h>
57 #include <sys/resource.h>
58 #include <sys/file.h>
59 #include <nfs/nfs.h>
60 #include <nfs/nfssys.h>
61 #include <stdio.h>
62 #include <stdlib.h>
63 #include <netconfig.h>
64 #include <netdir.h>
65 #include <string.h>
66 #include <unistd.h>
67 #include <stropts.h>
68 #include <sys/tihdr.h>
69 #include <netinet/tcp.h>
70 #include "nfs_tbind.h"
71 #include "thrpool.h"
72 #include <rpcsvc/nfs4_prot.h>
73 #include <netdb.h>
74 #include <signal.h>
75 #include <strings.h>
76 #include <priv_utils.h>
77 #include <rpcsvc/daemon_utils.h>
78
79 static int nfs4svc(int, struct netbuf *, struct netconfig *, int,
80 struct netbuf *);
81 extern int _nfssys(int, void *);
82
83 static char *MyName;
84
85 /*
86 * The following are all globals used by routines in nfs_tbind.c.
87 */
88 size_t end_listen_fds; /* used by conn_close_oldest() */
89 size_t num_fds = 0; /* used by multiple routines */
90 int listen_backlog = 32; /* used by bind_to_{provider,proto}() */
91 int num_servers; /* used by cots_listen_event() */
92 int (*Mysvc)(int, struct netbuf, struct netconfig *) = NULL;
93 /* used by cots_listen_event() */
94 int max_conns_allowed = -1; /* used by cots_listen_event() */
95
96 int
97 main(int argc, char *argv[])
98 {
99 int pid;
100 int i;
101 struct protob *protobp;
102 struct flock f;
103 pid_t pi;
104 struct svcpool_args cb_svcpool;
105
106 MyName = "nfs4cbd";
107 Mysvc4 = nfs4svc;
108
109 #ifndef DEBUG
110 /*
111 * Close existing file descriptors, open "/dev/null" as
112 * standard input, output, and error, and detach from
113 * controlling terminal.
114 */
115 closefrom(0);
116 (void) open("/dev/null", O_RDONLY);
117 (void) open("/dev/null", O_WRONLY);
118 (void) dup(1);
119 (void) setsid();
120 #endif
121
122 /*
123 * create a child to continue our work
124 * Parent's exit will tell mount command we're ready to go
125 */
126 if ((pi = fork()) > 0) {
127 exit(0);
128 }
129
130 if (pi == -1) {
131 (void) syslog(LOG_ERR,
132 "Could not start NFS4_CALLBACK service");
133 exit(1);
134 }
135
136 (void) _create_daemon_lock(NFS4CBD, DAEMON_UID, DAEMON_GID);
137
138 svcsetprio();
139
140 if (__init_daemon_priv(PU_RESETGROUPS|PU_CLEARLIMITSET,
141 DAEMON_UID, DAEMON_GID, PRIV_SYS_NFS, (char *)NULL) == -1) {
142 (void) fprintf(stderr, "%s must be run with sufficient"
143 " privileges\n", argv[0]);
144 exit(1);
145 }
146 /* Basic privileges we don't need, remove from E/P. */
147 __fini_daemon_priv(PRIV_PROC_EXEC, PRIV_PROC_FORK, PRIV_FILE_LINK_ANY,
148 PRIV_PROC_SESSION, PRIV_PROC_INFO, (char *)NULL);
149
150 /*
151 * establish our lock on the lock file and write our pid to it.
152 * exit if some other process holds the lock, or if there's any
153 * error in writing/locking the file.
154 */
155 pid = _enter_daemon_lock(NFS4CBD);
156 switch (pid) {
157 case 0:
158 break;
159 case -1:
160 syslog(LOG_ERR, "error locking for %s: %s", NFS4CBD,
161 strerror(errno));
162 exit(2);
163 default:
164 /* daemon was already running */
165 exit(0);
166 }
167
168 openlog(MyName, LOG_PID | LOG_NDELAY, LOG_DAEMON);
169
170 cb_svcpool.id = NFS_CB_SVCPOOL_ID;
171 cb_svcpool.maxthreads = 0;
172 cb_svcpool.redline = 0;
173 cb_svcpool.qsize = 0;
174 cb_svcpool.timeout = 0;
175 cb_svcpool.stksize = 0;
176 cb_svcpool.max_same_xprt = 0;
177
178 /* create a SVC_POOL for the nfsv4 callback deamon */
179 if (_nfssys(SVCPOOL_CREATE, &cb_svcpool)) {
180 (void) syslog(LOG_ERR, "can't setup NFS_CB SVCPOOL: Exiting");
181 exit(1);
182 }
183
184 /*
185 * Set up blocked thread to do LWP creation on behalf of the kernel.
186 */
187 if (svcwait(NFS_CB_SVCPOOL_ID)) {
188 (void) syslog(LOG_ERR,
189 "Can't set up NFS_CB LWP creator: Exiting");
190 exit(1);
191 }
192
193
194 /*
195 * Build a protocol block list for registration.
196 */
197 protobp = (struct protob *)malloc(sizeof (struct protob));
198 protobp->serv = "NFS4_CALLBACK";
199 protobp->versmin = NFS_CB;
200 protobp->versmax = NFS_CB;
201 protobp->program = NFS4_CALLBACK;
202 protobp->next = NULL;
203
204 if (do_all(protobp, NULL, 0) == -1) {
205 exit(1);
206 }
207
208 free(protobp);
209
210 if (num_fds == 0) {
211 (void) syslog(LOG_ERR,
212 "Could not start NFS4_CALLBACK service for any protocol");
213 exit(1);
214 }
215
216 end_listen_fds = num_fds;
217 /*
218 * Poll for non-data control events on the transport descriptors.
219 */
220 poll_for_action();
221
222 /*
223 * If we get here, something failed in poll_for_action().
224 */
225 return (1);
226 }
227
228 char *
229 get_uaddr(int fd, struct netconfig *nconf, struct netbuf *nb)
230 {
231 struct nfs_svc_args nsa;
232 char *ua, *ua2, *mua = NULL;
233 char me[MAXHOSTNAMELEN];
234 struct nd_addrlist *nas;
235 struct nd_hostserv hs;
236 struct nd_mergearg ma;
237
238 ua = taddr2uaddr(nconf, nb);
239
240 if (ua == NULL) {
241 #ifdef DEBUG
242 fprintf(stderr, "taddr2uaddr failed for netid %s\n",
243 nconf->nc_netid);
244 #endif
245 return (NULL);
246 }
247
248 gethostname(me, MAXHOSTNAMELEN);
249
250 hs.h_host = me;
251 hs.h_serv = "nfs";
252 if (netdir_getbyname(nconf, &hs, &nas)) {
253 #ifdef DEBUG
254 netdir_perror("netdir_getbyname");
255 #endif
256 return (NULL);
257 }
258
259 ua2 = taddr2uaddr(nconf, nas->n_addrs);
260
261 if (ua2 == NULL) {
262 #ifdef DEBUG
263 fprintf(stderr, "taddr2uaddr failed for netid %s.\n",
264 nconf->nc_netid);
265 #endif
266 return (NULL);
267 }
268
269 ma.s_uaddr = ua;
270 ma.c_uaddr = ua2;
271 ma.m_uaddr = NULL;
272
273 if (netdir_options(nconf, ND_MERGEADDR, 0, (char *)&ma)) {
274 #ifdef DEBUG
275 netdir_perror("netdir_options");
276 #endif
277 return (NULL);
278 }
279
280 mua = ma.m_uaddr;
281 return (mua);
282 }
283
284 /*
285 * Establish NFS4 callback service thread.
286 */
287 static int
288 nfs4svc(int fd, struct netbuf *addrmask, struct netconfig *nconf,
289 int cmd, struct netbuf *addr)
290 {
291 struct nfs4_svc_args nsa;
292 char *ua;
293 int error;
294
295 ua = get_uaddr(fd, nconf, addr);
296
297 if (ua == NULL) {
298 syslog(LOG_NOTICE, "nfsv4 cannot determine local hostname "
299 "binding for transport %s - delegations will not be "
300 "available on this transport\n", nconf->nc_netid);
301 return (0);
302 }
303
304 #ifdef DEBUG
305 if (cmd & NFS4_KRPC_START)
306 fprintf(stderr, "nfs4cbd: starting callback rpc on %s %s\n",
307 nconf->nc_netid, ua);
308 else
309 fprintf(stderr, "nfs4cbd: listening on %s %s\n",
310 nconf->nc_netid, ua);
311 #endif
312
313 nsa.fd = fd;
314 nsa.cmd = cmd;
315 nsa.netid = nconf->nc_netid;
316 if (addrmask)
317 nsa.addrmask = *addrmask;
318 else
319 bzero(&nsa.addrmask, sizeof (struct netbuf));
320 nsa.addr = ua;
321 nsa.protofmly = nconf->nc_protofmly;
322 nsa.proto = nconf->nc_proto;
323 if ((error = _nfssys(NFS4_SVC, &nsa)) != 0)
324 syslog(LOG_ERR, "nfssys NFS4_SVC failed\n");
325
326 return (error);
327 }