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 */ 33 34 #ifndef lint 35 static const char rcsid[] = 36 "$FreeBSD$"; 37 #endif /* not lint */ 38 39 /* main() function for status monitor daemon. Some of the code in this */ 40 /* file was generated by running rpcgen /usr/include/rpcsvc/sm_inter.x */ 41 /* The actual program logic is in the file procs.c */ 42 43 #include <err.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <rpc/rpc.h> 47 #include <rpc/rpc_com.h> 48 #include <string.h> 49 #include <syslog.h> 50 #include <sys/types.h> 51 #include <sys/wait.h> 52 #include <signal.h> 53 #include "statd.h" 54 55 int debug = 0; /* Controls syslog() calls for debug messages */ 56 57 extern void sm_prog_1(struct svc_req *rqstp, SVCXPRT *transp); 58 static void handle_sigchld(int sig); 59 static void usage(void); 60 61 int 62 main(int argc, char **argv) 63 { 64 struct sigaction sa; 65 int maxrec = RPC_MAXDATASIZE; 66 67 if (argc > 1) 68 { 69 if (strcmp(argv[1], "-d")) 70 usage(); 71 debug = 1; 72 } 73 74 (void)rpcb_unset(SM_PROG, SM_VERS, NULL); 75 76 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 77 78 if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "udp")) 79 errx(1, "cannot create udp service"); 80 if (!svc_create(sm_prog_1, SM_PROG, SM_VERS, "tcp")) 81 errx(1, "cannot create tcp service"); 82 init_file("/var/db/statd.status"); 83 84 /* Note that it is NOT sensible to run this program from inetd - the */ 85 /* protocol assumes that it will run immediately at boot time. */ 86 daemon(0, 0); 87 openlog("rpc.statd", 0, LOG_DAEMON); 88 if (debug) syslog(LOG_INFO, "Starting - debug enabled"); 89 else syslog(LOG_INFO, "Starting"); 90 91 /* Install signal handler to collect exit status of child processes */ 92 sa.sa_handler = handle_sigchld; 93 sigemptyset(&sa.sa_mask); 94 sigaddset(&sa.sa_mask, SIGCHLD); 95 sa.sa_flags = SA_RESTART; 96 sigaction(SIGCHLD, &sa, NULL); 97 98 /* Initialisation now complete - start operating */ 99 notify_hosts(); /* Forks a process (if necessary) to do the */ 100 /* SM_NOTIFY calls, which may be slow. */ 101 102 svc_run(); /* Should never return */ 103 exit(1); 104 } 105 106 static void 107 usage() 108 { 109 fprintf(stderr, "usage: rpc.statd [-d]\n"); 110 exit(1); 111 } 112 113 /* handle_sigchld ---------------------------------------------------------- */ 114 /* 115 Purpose: Catch SIGCHLD and collect process status 116 Retruns: Nothing. 117 Notes: No special action required, other than to collect the 118 process status and hence allow the child to die: 119 we only use child processes for asynchronous transmission 120 of SM_NOTIFY to other systems, so it is normal for the 121 children to exit when they have done their work. 122 */ 123 124 static void handle_sigchld(int sig __unused) 125 { 126 int pid, status; 127 pid = wait4(-1, &status, WNOHANG, (struct rusage*)0); 128 if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??"); 129 else if (status == 0) 130 { 131 if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid); 132 } 133 else syslog(LOG_ERR, "Child %d failed with status %d", pid, 134 WEXITSTATUS(status)); 135 } 136 137