1 /* 2 * Copyright (c) 1995 3 * A.R. Gordon (andrew.gordon@net-tel.co.uk). All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed for the FreeBSD project 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: src/usr.sbin/rpc.statd/statd.c,v 1.6 1999/10/05 14:40:38 marcel Exp $ 33 */ 34 35 /* main() function for status monitor daemon. Some of the code in this */ 36 /* file was generated by running rpcgen /usr/include/rpcsvc/sm_inter.x */ 37 /* The actual program logic is in the file procs.c */ 38 39 #include <err.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <rpc/rpc.h> 43 #include <string.h> 44 #include <syslog.h> 45 #include <sys/types.h> 46 #include <sys/wait.h> 47 #include <signal.h> 48 #include "statd.h" 49 50 int debug = 0; /* Controls syslog() calls for debug messages */ 51 52 static void handle_sigchld(int); 53 static void usage(void); 54 55 int 56 main(int argc, char **argv) 57 { 58 struct sigaction sa; 59 int maxrec = RPC_MAXDATASIZE; 60 61 if (argc > 1) 62 { 63 if (strcmp(argv[1], "-d")) 64 usage(); 65 debug = 1; 66 } 67 68 rpcb_unset(SM_PROG, SM_VERS, NULL); 69 70 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 71 72 if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "udp")) 73 errx(1, "cannot create udp service"); 74 if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "tcp")) 75 errx(1, "cannot create tcp service"); 76 init_file("/var/db/statd.status"); 77 78 /* Note that it is NOT sensible to run this program from inetd - the */ 79 /* protocol assumes that it will run immediately at boot time. */ 80 daemon(0, 0); 81 openlog("rpc.statd", 0, LOG_DAEMON); 82 if (debug) syslog(LOG_INFO, "Starting - debug enabled"); 83 else syslog(LOG_INFO, "Starting"); 84 85 /* Install signal handler to collect exit status of child processes */ 86 sa.sa_handler = handle_sigchld; 87 sigemptyset(&sa.sa_mask); 88 sigaddset(&sa.sa_mask, SIGCHLD); 89 sa.sa_flags = SA_RESTART; 90 sigaction(SIGCHLD, &sa, NULL); 91 92 /* Initialisation now complete - start operating */ 93 notify_hosts(); /* Forks a process (if necessary) to do the */ 94 /* SM_NOTIFY calls, which may be slow. */ 95 96 svc_run(); /* Should never return */ 97 exit(1); 98 } 99 100 static void 101 usage(void) 102 { 103 fprintf(stderr, "usage: rpc.statd [-d]\n"); 104 exit(1); 105 } 106 107 /* handle_sigchld ---------------------------------------------------------- */ 108 /* 109 Purpose: Catch SIGCHLD and collect process status 110 Retruns: Nothing. 111 Notes: No special action required, other than to collect the 112 process status and hence allow the child to die: 113 we only use child processes for asynchronous transmission 114 of SM_NOTIFY to other systems, so it is normal for the 115 children to exit when they have done their work. 116 */ 117 118 static void 119 handle_sigchld(__unused int sig) 120 { 121 int pid, status; 122 pid = wait4(-1, &status, WNOHANG, NULL); 123 if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??"); 124 else if (status == 0) 125 { 126 if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid); 127 } 128 else syslog(LOG_ERR, "Child %d failed with status %d", pid, 129 WEXITSTATUS(status)); 130 } 131