libexec/rpc.rusersd/rusersd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1993, John Brezak
   5  * 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * $FreeBSD: head/libexec/rpc.rusersd/rusersd.c 326025 2017-11-20 19:49:47Z pfg $
  32  */
  33
  34 #include <stdlib.h>
  35 #include <rpc/rpc.h>
  36 #include <sys/socket.h>
  37 #include <signal.h>
  38 #include <syslog.h>
  39 #include <rpcsvc/rnusers.h>
  40
  41 #include "extern.h"
  42
  43 int from_inetd = 1;
  44
  45 static void __dead2
  46 cleanup(int sig __unused)
  47 {
  48         (void) rpcb_unset(RUSERSPROG, RUSERSVERS_IDLE, NULL);
  49         (void) rpcb_unset(RUSERSPROG, RUSERSVERS_ORIG, NULL);
  50         exit(0);
  51 }
  52
  53 int
  54 main(int argc __unused, char *argv[] __unused)
  55 {
  56         SVCXPRT *transp = NULL; /* Keep compiler happy. */
  57         int ok;
  58         struct sockaddr_storage from;
  59         socklen_t fromlen;
  60
  61         /*
  62          * See if inetd started us
  63          */
  64         fromlen = sizeof(from);
  65         if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
  66                 from_inetd = 0;
  67         }
  68
  69         if (!from_inetd) {
  70                 daemon(0, 0);
  71
  72                 (void) rpcb_unset(RUSERSPROG, RUSERSVERS_IDLE, NULL);
  73                 (void) rpcb_unset(RUSERSPROG, RUSERSVERS_ORIG, NULL);
  74
  75                 (void) signal(SIGINT, cleanup);
  76                 (void) signal(SIGTERM, cleanup);
  77                 (void) signal(SIGHUP, cleanup);
  78         }
  79
  80         openlog("rpc.rusersd", LOG_CONS|LOG_PID, LOG_DAEMON);
  81
  82         if (from_inetd) {
  83                 transp = svc_tli_create(0, NULL, NULL, 0, 0);
  84                 if (transp == NULL) {
  85                         syslog(LOG_ERR, "cannot create udp service.");
  86                         exit(1);
  87                 }
  88                 ok = svc_reg(transp, RUSERSPROG, RUSERSVERS_IDLE,
  89                              rusers_service, NULL);
  90         } else
  91                 ok = svc_create(rusers_service,
  92                                 RUSERSPROG, RUSERSVERS_IDLE, "udp");
  93         if (!ok) {
  94                 syslog(LOG_ERR, "unable to register (RUSERSPROG, RUSERSVERS_IDLE, %s)", (!from_inetd)?"udp":"(inetd)");
  95                 exit(1);
  96         }
  97         if (from_inetd)
  98                 ok = svc_reg(transp, RUSERSPROG, RUSERSVERS_ORIG,
  99                              rusers_service, NULL);
 100         else
 101                 ok = svc_create(rusers_service,
 102                                 RUSERSPROG, RUSERSVERS_ORIG, "udp");
 103         if (!ok) {
 104                 syslog(LOG_ERR, "unable to register (RUSERSPROG, RUSERSVERS_ORIG, %s)", (!from_inetd)?"udp":"(inetd)");
 105                 exit(1);
 106         }
 107
 108         svc_run();
 109         syslog(LOG_ERR, "svc_run returned");
 110         exit(1);
 111 }