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 (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
26 /* All Rights Reserved */
27
28 /*
29 * Portions of this source code were derived from Berkeley 4.3 BSD
30 * under license from the Regents of the University of California.
31 */
32
33 /*
34 * This module provides the user level support for the NFSv4
35 * callback program. It is modeled after nfsd. When a nfsv4
36 * mount occurs, the mount command forks and the child runs
37 * start_nfs4_callback. If this is the first mount, then the
38 * process will hang around listening for incoming connection
39 * requests from the nfsv4 server.
40 *
41 * For connection-less protocols, the krpc is started immediately.
42 * For connection oriented protocols, the kernel module is informed
43 * of netid and universal address that it can give this
44 * information to the server during setclientid.
45 */
46
47 #include <sys/param.h>
48 #include <sys/types.h>
49 #include <syslog.h>
50 #include <tiuser.h>
51 #include <rpc/rpc.h>
52 #include <errno.h>
53 #include <thread.h>
54 #include <sys/resource.h>
55 #include <sys/file.h>
56 #include <nfs/nfs.h>
57 #include <nfs/nfssys.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <netconfig.h>
61 #include <netdir.h>
62 #include <string.h>
63 #include <unistd.h>
64 #include <stropts.h>
65 #include <sys/tihdr.h>
66 #include <netinet/tcp.h>
67 #include "nfs_tbind.h"
68 #include "thrpool.h"
69 #include <rpcsvc/nfs4_prot.h>
70 #include <netdb.h>
71 #include <signal.h>
72 #include <strings.h>
73 #include <priv_utils.h>
74 #include <rpcsvc/daemon_utils.h>
75
76 static int nfs4svc(int, struct netbuf *, struct netconfig *, int,
77 struct netbuf *);
78 extern int _nfssys(int, void *);
79
80 static char *MyName;
81
82 /*
83 * The following are all globals used by routines in nfs_tbind.c.
84 */
85 size_t end_listen_fds; /* used by conn_close_oldest() */
86 size_t num_fds = 0; /* used by multiple routines */
87 int listen_backlog = 32; /* used by bind_to_{provider,proto}() */
88 int num_servers; /* used by cots_listen_event() */
89 int (*Mysvc)(int, struct netbuf, struct netconfig *) = NULL;
90 /* used by cots_listen_event() */
91 int max_conns_allowed = -1; /* used by cots_listen_event() */
92
93 int
main(int argc,char * argv[])94 main(int argc, char *argv[])
95 {
96 int pid;
97 int i;
98 struct protob *protobp;
99 struct flock f;
100 pid_t pi;
101 struct svcpool_args cb_svcpool;
102
103 MyName = "nfs4cbd";
104 Mysvc4 = nfs4svc;
105
106 #ifndef DEBUG
107 /*
108 * Close existing file descriptors, open "/dev/null" as
109 * standard input, output, and error, and detach from
110 * controlling terminal.
111 */
112 closefrom(0);
113 (void) open("/dev/null", O_RDONLY);
114 (void) open("/dev/null", O_WRONLY);
115 (void) dup(1);
116 (void) setsid();
117 #endif
118
119 /*
120 * create a child to continue our work
121 * Parent's exit will tell mount command we're ready to go
122 */
123 if ((pi = fork()) > 0) {
124 exit(0);
125 }
126
127 if (pi == -1) {
128 (void) syslog(LOG_ERR,
129 "Could not start NFS4_CALLBACK service");
130 exit(1);
131 }
132
133 (void) _create_daemon_lock(NFS4CBD, DAEMON_UID, DAEMON_GID);
134
135 svcsetprio();
136
137 if (__init_daemon_priv(PU_RESETGROUPS|PU_CLEARLIMITSET,
138 DAEMON_UID, DAEMON_GID, PRIV_SYS_NFS, (char *)NULL) == -1) {
139 (void) fprintf(stderr, "%s must be run with sufficient"
140 " privileges\n", argv[0]);
141 exit(1);
142 }
143 /* Basic privileges we don't need, remove from E/P. */
144 __fini_daemon_priv(PRIV_PROC_EXEC, PRIV_PROC_FORK, PRIV_FILE_LINK_ANY,
145 PRIV_PROC_SESSION, PRIV_PROC_INFO, (char *)NULL);
146
147 /*
148 * establish our lock on the lock file and write our pid to it.
149 * exit if some other process holds the lock, or if there's any
150 * error in writing/locking the file.
151 */
152 pid = _enter_daemon_lock(NFS4CBD);
153 switch (pid) {
154 case 0:
155 break;
156 case -1:
157 syslog(LOG_ERR, "error locking for %s: %s", NFS4CBD,
158 strerror(errno));
159 exit(2);
160 default:
161 /* daemon was already running */
162 exit(0);
163 }
164
165 openlog(MyName, LOG_PID | LOG_NDELAY, LOG_DAEMON);
166
167 cb_svcpool.id = NFS_CB_SVCPOOL_ID;
168 cb_svcpool.maxthreads = 0;
169 cb_svcpool.redline = 0;
170 cb_svcpool.qsize = 0;
171 cb_svcpool.timeout = 0;
172 cb_svcpool.stksize = 0;
173 cb_svcpool.max_same_xprt = 0;
174
175 /* create a SVC_POOL for the nfsv4 callback deamon */
176 if (_nfssys(SVCPOOL_CREATE, &cb_svcpool)) {
177 (void) syslog(LOG_ERR, "can't setup NFS_CB SVCPOOL: Exiting");
178 exit(1);
179 }
180
181 /*
182 * Set up blocked thread to do LWP creation on behalf of the kernel.
183 */
184 if (svcwait(NFS_CB_SVCPOOL_ID)) {
185 (void) syslog(LOG_ERR,
186 "Can't set up NFS_CB LWP creator: Exiting");
187 exit(1);
188 }
189
190
191 /*
192 * Build a protocol block list for registration.
193 */
194 protobp = (struct protob *)malloc(sizeof (struct protob));
195 protobp->serv = "NFS4_CALLBACK";
196 protobp->versmin = NFS_CB;
197 protobp->versmax = NFS_CB;
198 protobp->program = NFS4_CALLBACK;
199 protobp->next = NULL;
200
201 if (do_all(protobp, NULL) == -1) {
202 exit(1);
203 }
204
205 free(protobp);
206
207 if (num_fds == 0) {
208 (void) syslog(LOG_ERR,
209 "Could not start NFS4_CALLBACK service for any protocol");
210 exit(1);
211 }
212
213 end_listen_fds = num_fds;
214 /*
215 * Poll for non-data control events on the transport descriptors.
216 */
217 poll_for_action();
218
219 /*
220 * If we get here, something failed in poll_for_action().
221 */
222 return (1);
223 }
224
225 char *
get_uaddr(int fd,struct netconfig * nconf,struct netbuf * nb)226 get_uaddr(int fd, struct netconfig *nconf, struct netbuf *nb)
227 {
228 struct nfs_svc_args nsa;
229 char *ua, *ua2, *mua = NULL;
230 char me[MAXHOSTNAMELEN];
231 struct nd_addrlist *nas;
232 struct nd_hostserv hs;
233 struct nd_mergearg ma;
234
235 ua = taddr2uaddr(nconf, nb);
236
237 if (ua == NULL) {
238 #ifdef DEBUG
239 fprintf(stderr, "taddr2uaddr failed for netid %s\n",
240 nconf->nc_netid);
241 #endif
242 return (NULL);
243 }
244
245 gethostname(me, MAXHOSTNAMELEN);
246
247 hs.h_host = me;
248 hs.h_serv = "nfs";
249 if (netdir_getbyname(nconf, &hs, &nas)) {
250 #ifdef DEBUG
251 netdir_perror("netdir_getbyname");
252 #endif
253 return (NULL);
254 }
255
256 ua2 = taddr2uaddr(nconf, nas->n_addrs);
257
258 if (ua2 == NULL) {
259 #ifdef DEBUG
260 fprintf(stderr, "taddr2uaddr failed for netid %s.\n",
261 nconf->nc_netid);
262 #endif
263 return (NULL);
264 }
265
266 ma.s_uaddr = ua;
267 ma.c_uaddr = ua2;
268 ma.m_uaddr = NULL;
269
270 if (netdir_options(nconf, ND_MERGEADDR, 0, (char *)&ma)) {
271 #ifdef DEBUG
272 netdir_perror("netdir_options");
273 #endif
274 return (NULL);
275 }
276
277 mua = ma.m_uaddr;
278 return (mua);
279 }
280
281 /*
282 * Establish NFS4 callback service thread.
283 */
284 static int
nfs4svc(int fd,struct netbuf * addrmask,struct netconfig * nconf,int cmd,struct netbuf * addr)285 nfs4svc(int fd, struct netbuf *addrmask, struct netconfig *nconf,
286 int cmd, struct netbuf *addr)
287 {
288 struct nfs4_svc_args nsa;
289 char *ua;
290 int error;
291
292 ua = get_uaddr(fd, nconf, addr);
293
294 if (ua == NULL) {
295 syslog(LOG_NOTICE, "nfsv4 cannot determine local hostname "
296 "binding for transport %s - delegations will not be "
297 "available on this transport\n", nconf->nc_netid);
298 return (0);
299 }
300
301 #ifdef DEBUG
302 if (cmd & NFS4_KRPC_START)
303 fprintf(stderr, "nfs4cbd: starting callback rpc on %s %s\n",
304 nconf->nc_netid, ua);
305 else
306 fprintf(stderr, "nfs4cbd: listening on %s %s\n",
307 nconf->nc_netid, ua);
308 #endif
309
310 nsa.fd = fd;
311 nsa.cmd = cmd;
312 nsa.netid = nconf->nc_netid;
313 if (addrmask)
314 nsa.addrmask = *addrmask;
315 else
316 bzero(&nsa.addrmask, sizeof (struct netbuf));
317 nsa.addr = ua;
318 nsa.protofmly = nconf->nc_protofmly;
319 nsa.proto = nconf->nc_proto;
320 if ((error = _nfssys(NFS4_SVC, &nsa)) != 0)
321 syslog(LOG_ERR, "nfssys NFS4_SVC failed\n");
322
323 return (error);
324 }
325