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 <string.h> 43 #include <rpc/rpc.h> 44 #include <rpc/pmap_clnt.h> 45 #include <syslog.h> 46 #include <sys/types.h> 47 #include <sys/wait.h> 48 #include <signal.h> 49 #include "statd.h" 50 51 int debug = 0; /* Controls syslog() calls for debug messages */ 52 53 extern void sm_prog_1(struct svc_req *rqstp, SVCXPRT *transp); 54 static void handle_sigchld(); 55 static void usage(void); 56 57 int 58 main(int argc, char **argv) 59 { 60 SVCXPRT *transp; 61 struct sigaction sa; 62 63 if (argc > 1) 64 { 65 if (strcmp(argv[1], "-d")) 66 usage(); 67 debug = 1; 68 } 69 70 pmap_unset(SM_PROG, SM_VERS); 71 72 transp = svcudp_create(RPC_ANYSOCK); 73 if (transp == NULL) 74 errx(1, "cannot create udp service"); 75 if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_UDP)) 76 errx(1, "unable to register (SM_PROG, SM_VERS, udp)"); 77 78 transp = svctcp_create(RPC_ANYSOCK, 0, 0); 79 if (transp == NULL) 80 errx(1, "cannot create tcp service"); 81 if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_TCP)) 82 errx(1, "unable to register (SM_PROG, SM_VERS, tcp)"); 83 init_file("/var/db/statd.status"); 84 85 /* Note that it is NOT sensible to run this program from inetd - the */ 86 /* protocol assumes that it will run immediately at boot time. */ 87 daemon(0, 0); 88 openlog("rpc.statd", 0, LOG_DAEMON); 89 if (debug) syslog(LOG_INFO, "Starting - debug enabled"); 90 else syslog(LOG_INFO, "Starting"); 91 92 /* Install signal handler to collect exit status of child processes */ 93 sa.sa_handler = handle_sigchld; 94 sigemptyset(&sa.sa_mask); 95 sigaddset(&sa.sa_mask, SIGCHLD); 96 sa.sa_flags = SA_RESTART; 97 sigaction(SIGCHLD, &sa, NULL); 98 99 /* Initialisation now complete - start operating */ 100 notify_hosts(); /* Forks a process (if necessary) to do the */ 101 /* SM_NOTIFY calls, which may be slow. */ 102 103 svc_run(); /* Should never return */ 104 exit(1); 105 } 106 107 static void 108 usage(void) 109 { 110 fprintf(stderr, "usage: rpc.statd [-d]\n"); 111 exit(1); 112 } 113 114 /* handle_sigchld ---------------------------------------------------------- */ 115 /* 116 Purpose: Catch SIGCHLD and collect process status 117 Retruns: Nothing. 118 Notes: No special action required, other than to collect the 119 process status and hence allow the child to die: 120 we only use child processes for asynchronous transmission 121 of SM_NOTIFY to other systems, so it is normal for the 122 children to exit when they have done their work. 123 */ 124 125 static void 126 handle_sigchld(int sig, int code, struct sigcontext *scp) 127 { 128 int pid, status; 129 pid = wait4(-1, &status, WNOHANG, NULL); 130 if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??"); 131 else if (status == 0) 132 { 133 if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid); 134 } 135 else syslog(LOG_ERR, "Child %d failed with status %d", pid, 136 WEXITSTATUS(status)); 137 } 138 139