usr.sbin/rpc.lockd/lockd.c

   1 /*      $NetBSD: lockd.c,v 1.9 2007/11/04 23:12:50 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 1995
   5  *      A.R. Gordon (andrew.gordon@net-tel.co.uk).  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed for the FreeBSD project
  18  * 4. Neither the name of the author nor the names of any co-contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __RCSID("$NetBSD: lockd.c,v 1.9 2007/11/04 23:12:50 christos Exp $");
  39 #endif
  40
  41 /*
  42  * main() function for NFS lock daemon.  Most of the code in this
  43  * file was generated by running rpcgen /usr/include/rpcsvc/nlm_prot.x.
  44  *
  45  * The actual program logic is in the file lock_proc.c
  46  */
  47
  48 #include <sys/types.h>
  49 #include <sys/socket.h>
  50
  51 #include <err.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <errno.h>
  55 #include <syslog.h>
  56 #include <signal.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59 #include <util.h>
  60 #include <netconfig.h>
  61
  62 #include <rpc/rpc.h>
  63 #include <rpcsvc/sm_inter.h>
  64
  65 #include "lockd.h"
  66 #include <rpcsvc/nlm_prot.h>
  67
  68 int             debug_level = 0;        /* 0 = no debugging syslog() calls */
  69 int             _rpcsvcdirty = 0;
  70
  71 int grace_expired;
  72
  73 void    nlm_prog_0(struct svc_req *, SVCXPRT *);
  74 void    nlm_prog_1(struct svc_req *, SVCXPRT *);
  75 void    nlm_prog_3(struct svc_req *, SVCXPRT *);
  76 void    nlm_prog_4(struct svc_req *, SVCXPRT *);
  77 static void     usage(void) __dead;
  78
  79 static void sigalarm_handler(int);
  80
  81 static const char *transports[] = { "udp", "tcp", "udp6", "tcp6" };
  82
  83 int
  84 main(int argc, char **argv)
  85 {
  86         SVCXPRT *transp;
  87         int ch, i, maxindex, s;
  88         struct sigaction sigchild, sigalarm;
  89         int grace_period = 30;
  90         struct netconfig *nconf;
  91         int maxrec = RPC_MAXDATASIZE;
  92
  93         (void)setprogname(*argv);
  94         while ((ch = getopt(argc, argv, "d:g:")) != (-1)) {
  95                 switch (ch) {
  96                 case 'd':
  97                         debug_level = atoi(optarg);
  98                         if (!debug_level) {
  99                                 usage();
 100                                 /* NOTREACHED */
 101                         }
 102                         break;
 103                 case 'g':
 104                         grace_period = atoi(optarg);
 105                         if (!grace_period) {
 106                                 usage();
 107                                 /* NOTREACHED */
 108                         }
 109                         break;
 110                 default:
 111                 case '?':
 112                         usage();
 113                         /* NOTREACHED */
 114                 }
 115         }
 116
 117         (void)rpcb_unset(NLM_PROG, NLM_SM, NULL);
 118         (void)rpcb_unset(NLM_PROG, NLM_VERS, NULL);
 119         (void)rpcb_unset(NLM_PROG, NLM_VERSX, NULL);
 120         (void)rpcb_unset(NLM_PROG, NLM_VERS4, NULL);
 121
 122         /*
 123          * Check if IPv6 support is present.
 124          */
 125         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 126         if (s < 0)
 127                 maxindex = 2;
 128         else {
 129                 (void)close(s);
 130                 maxindex = 4;
 131         }
 132
 133         (void)rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 134
 135         for (i = 0; i < maxindex; i++) {
 136                 nconf = getnetconfigent(transports[i]);
 137                 if (nconf == NULL)
 138                         errx(1, "cannot get udp netconf.");
 139
 140                 transp = svc_tli_create(RPC_ANYFD, nconf, NULL, RPC_MAXDATASIZE,
 141                     RPC_MAXDATASIZE);
 142                 if (transp == NULL) {
 143                         errx(1, "cannot create %s service.", transports[i]);
 144                         /* NOTREACHED */
 145                 }
 146                 if (!svc_reg(transp, NLM_PROG, NLM_SM, nlm_prog_0, nconf)) {
 147                         errx(1, "unable to register (NLM_PROG, NLM_SM, %s)",
 148                             transports[i]);
 149                         /* NOTREACHED */
 150                 }
 151                 if (!svc_reg(transp, NLM_PROG, NLM_VERS, nlm_prog_1, nconf)) {
 152                         errx(1, "unable to register (NLM_PROG, NLM_VERS, %s)",
 153                             transports[i]);
 154                         /* NOTREACHED */
 155                 }
 156                 if (!svc_reg(transp, NLM_PROG, NLM_VERSX, nlm_prog_3, nconf)) {
 157                         errx(1, "unable to register (NLM_PROG, NLM_VERSX, %s)",
 158                             transports[i]);
 159                         /* NOTREACHED */
 160                 }
 161                 if (!svc_reg(transp, NLM_PROG, NLM_VERS4, nlm_prog_4, nconf)) {
 162                         errx(1, "unable to register (NLM_PROG, NLM_VERS4, %s)",
 163                             transports[i]);
 164                         /* NOTREACHED */
 165                 }
 166                 freenetconfigent(nconf);
 167         }
 168
 169         /*
 170          * Note that it is NOT sensible to run this program from inetd - the
 171          * protocol assumes that it will run immediately at boot time.
 172          */
 173         if (daemon(0, 0) == -1) {
 174                 err(1, "cannot fork");
 175                 /* NOTREACHED */
 176         }
 177         (void)pidfile(NULL);
 178
 179         openlog("rpc.lockd", 0, LOG_DAEMON);
 180         if (debug_level)
 181                 syslog(LOG_INFO, "Starting, debug level %d", debug_level);
 182         else
 183                 syslog(LOG_INFO, "Starting");
 184
 185         sigchild.sa_handler = sigchild_handler;
 186         (void)sigemptyset(&sigchild.sa_mask);
 187         sigchild.sa_flags = SA_RESTART;
 188         if (sigaction(SIGCHLD, &sigchild, NULL) != 0) {
 189                 syslog(LOG_WARNING, "sigaction(SIGCHLD) failed (%m)");
 190                 exit(1);
 191         }
 192         sigalarm.sa_handler = sigalarm_handler;
 193         (void)sigemptyset(&sigalarm.sa_mask);
 194         sigalarm.sa_flags = SA_RESETHAND; /* should only happen once */
 195         sigalarm.sa_flags |= SA_RESTART;
 196         if (sigaction(SIGALRM, &sigalarm, NULL) != 0) {
 197                 syslog(LOG_WARNING, "sigaction(SIGALRM) failed (%m)");
 198                 exit(1);
 199         }
 200         grace_expired = 0;
 201         if (alarm(10) == (unsigned int)-1) {
 202                 syslog(LOG_WARNING, "alarm failed (%m)");
 203                 exit(1);
 204         }
 205
 206         svc_run();              /* Should never return */
 207         return 1;
 208 }
 209
 210 static void
 211 /*ARGSUSED*/
 212 sigalarm_handler(int s)
 213 {
 214         grace_expired = 1;
 215 }
 216
 217 static void
 218 usage(void)
 219 {
 220         (void)fprintf(stderr, "Usage: %s[-d <debuglevel>] [-g <grace period>]",
 221             getprogname());
 222         exit(1);
 223 }