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/pmap_clnt.h> 48 #include <syslog.h> 49 #include <sys/types.h> 50 #include <sys/wait.h> 51 #include <signal.h> 52 #include "statd.h" 53 54 int debug = 0; /* Controls syslog() calls for debug messages */ 55 56 extern void sm_prog_1(struct svc_req *rqstp, SVCXPRT *transp); 57 static void handle_sigchld(); 58 static void usage __P((void)); 59 60 int 61 main(int argc, char **argv) 62 { 63 SVCXPRT *transp; 64 struct sigaction sa; 65 66 if (argc > 1) 67 { 68 if (strcmp(argv[1], "-d")) 69 usage(); 70 debug = 1; 71 } 72 73 (void)pmap_unset(SM_PROG, SM_VERS); 74 75 transp = svcudp_create(RPC_ANYSOCK); 76 if (transp == NULL) 77 errx(1, "cannot create udp service"); 78 if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_UDP)) 79 errx(1, "unable to register (SM_PROG, SM_VERS, udp)"); 80 81 transp = svctcp_create(RPC_ANYSOCK, 0, 0); 82 if (transp == NULL) 83 errx(1, "cannot create tcp service"); 84 if (!svc_register(transp, SM_PROG, SM_VERS, sm_prog_1, IPPROTO_TCP)) 85 errx(1, "unable to register (SM_PROG, SM_VERS, tcp)"); 86 init_file("/var/db/statd.status"); 87 88 /* Note that it is NOT sensible to run this program from inetd - the */ 89 /* protocol assumes that it will run immediately at boot time. */ 90 daemon(0, 0); 91 openlog("rpc.statd", 0, LOG_DAEMON); 92 if (debug) syslog(LOG_INFO, "Starting - debug enabled"); 93 else syslog(LOG_INFO, "Starting"); 94 95 /* Install signal handler to collect exit status of child processes */ 96 sa.sa_handler = handle_sigchld; 97 sigemptyset(&sa.sa_mask); 98 sigaddset(&sa.sa_mask, SIGCHLD); 99 sa.sa_flags = SA_RESTART; 100 sigaction(SIGCHLD, &sa, NULL); 101 102 /* Initialisation now complete - start operating */ 103 notify_hosts(); /* Forks a process (if necessary) to do the */ 104 /* SM_NOTIFY calls, which may be slow. */ 105 106 svc_run(); /* Should never return */ 107 exit(1); 108 } 109 110 static void 111 usage() 112 { 113 fprintf(stderr, "usage: rpc.statd [-d]\n"); 114 exit(1); 115 } 116 117 /* handle_sigchld ---------------------------------------------------------- */ 118 /* 119 Purpose: Catch SIGCHLD and collect process status 120 Retruns: Nothing. 121 Notes: No special action required, other than to collect the 122 process status and hence allow the child to die: 123 we only use child processes for asynchronous transmission 124 of SM_NOTIFY to other systems, so it is normal for the 125 children to exit when they have done their work. 126 */ 127 128 static void handle_sigchld(int sig, int code, void *scp) 129 { 130 int pid, status; 131 pid = wait4(-1, &status, WNOHANG, (struct rusage*)0); 132 if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??"); 133 else if (status == 0) 134 { 135 if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid); 136 } 137 else syslog(LOG_ERR, "Child %d failed with status %d", pid, 138 WEXITSTATUS(status)); 139 } 140 141