usr/src/cmd/fs.d/nfs/nfs4cbd/nfs4cbd.c

   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
  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 *
 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
 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 }