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 60 if (argc > 1) 61 { 62 if (strcmp(argv[1], "-d")) 63 usage(); 64 debug = 1; 65 } 66 67 rpcb_unset(SM_PROG, SM_VERS, NULL); 68 69 if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "udp")) 70 errx(1, "cannot create udp service"); 71 if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "tcp")) 72 errx(1, "cannot create tcp service"); 73 init_file("/var/db/statd.status"); 74 75 /* Note that it is NOT sensible to run this program from inetd - the */ 76 /* protocol assumes that it will run immediately at boot time. */ 77 daemon(0, 0); 78 openlog("rpc.statd", 0, LOG_DAEMON); 79 if (debug) syslog(LOG_INFO, "Starting - debug enabled"); 80 else syslog(LOG_INFO, "Starting"); 81 82 /* Install signal handler to collect exit status of child processes */ 83 sa.sa_handler = handle_sigchld; 84 sigemptyset(&sa.sa_mask); 85 sigaddset(&sa.sa_mask, SIGCHLD); 86 sa.sa_flags = SA_RESTART; 87 sigaction(SIGCHLD, &sa, NULL); 88 89 /* Initialisation now complete - start operating */ 90 notify_hosts(); /* Forks a process (if necessary) to do the */ 91 /* SM_NOTIFY calls, which may be slow. */ 92 93 svc_run(); /* Should never return */ 94 exit(1); 95 } 96 97 static void 98 usage(void) 99 { 100 fprintf(stderr, "usage: rpc.statd [-d]\n"); 101 exit(1); 102 } 103 104 /* handle_sigchld ---------------------------------------------------------- */ 105 /* 106 Purpose: Catch SIGCHLD and collect process status 107 Retruns: Nothing. 108 Notes: No special action required, other than to collect the 109 process status and hence allow the child to die: 110 we only use child processes for asynchronous transmission 111 of SM_NOTIFY to other systems, so it is normal for the 112 children to exit when they have done their work. 113 */ 114 115 static void 116 handle_sigchld(__unused int sig) 117 { 118 int pid, status; 119 pid = wait4(-1, &status, WNOHANG, NULL); 120 if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??"); 121 else if (status == 0) 122 { 123 if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid); 124 } 125 else syslog(LOG_ERR, "Child %d failed with status %d", pid, 126 WEXITSTATUS(status)); 127 } 128