1 /* $OpenBSD: rstatd.c,v 1.22 2009/05/20 20:37:43 thib Exp $ */ 2 3 /*- 4 * Copyright (c) 1993, John Brezak 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #ifndef lint 32 static char rcsid[] = "$OpenBSD: rstatd.c,v 1.22 2009/05/20 20:37:43 thib Exp $"; 33 #endif /* not lint */ 34 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include <signal.h> 42 #include <pwd.h> 43 #include <syslog.h> 44 #include <errno.h> 45 #include <stdlib.h> 46 #include <rpc/rpc.h> 47 #include <rpcsvc/rstat.h> 48 49 extern int __svc_fdsetsize; 50 extern fd_set *__svc_fdset; 51 extern void svc_getreqset2(fd_set *, int); 52 extern void rstat_service(struct svc_req *, SVCXPRT *); 53 54 void my_svc_run(void); 55 56 int from_inetd = 1; /* started from inetd ? */ 57 int closedown = 20; /* how long to wait before going dormant */ 58 59 volatile sig_atomic_t gotsig; 60 61 /* ARGSUSED */ 62 static void 63 getsig(int signo) 64 { 65 gotsig = 1; 66 } 67 68 69 int 70 main(int argc, char *argv[]) 71 { 72 int sock = 0, proto = 0; 73 socklen_t fromlen; 74 struct passwd *pw; 75 struct sockaddr_storage from; 76 SVCXPRT *transp; 77 78 openlog("rpc.rstatd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON); 79 80 if ((pw = getpwnam("_rstatd")) == NULL) { 81 syslog(LOG_ERR, "no such user _rstatd"); 82 exit(1); 83 } 84 if (chroot("/var/empty") == -1) { 85 syslog(LOG_ERR, "cannot chdir to /var/empty."); 86 exit(1); 87 } 88 chdir("/"); 89 90 if (pw) { 91 setgroups(1, &pw->pw_gid); 92 setegid(pw->pw_gid); 93 setgid(pw->pw_gid); 94 seteuid(pw->pw_uid); 95 setuid(pw->pw_uid); 96 } 97 98 if (argc == 2) 99 closedown = atoi(argv[1]); 100 if (closedown <= 0) 101 closedown = 20; 102 103 /* 104 * See if inetd started us 105 */ 106 fromlen = sizeof(from); 107 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) { 108 from_inetd = 0; 109 sock = RPC_ANYSOCK; 110 proto = IPPROTO_UDP; 111 } 112 113 if (!from_inetd) { 114 daemon(0, 0); 115 116 (void)pmap_unset(RSTATPROG, RSTATVERS_TIME); 117 (void)pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 118 (void)pmap_unset(RSTATPROG, RSTATVERS_ORIG); 119 120 (void) signal(SIGINT, getsig); 121 (void) signal(SIGTERM, getsig); 122 (void) signal(SIGHUP, getsig); 123 } 124 125 transp = svcudp_create(sock); 126 if (transp == NULL) { 127 syslog(LOG_ERR, "cannot create udp service."); 128 exit(1); 129 } 130 if (!svc_register(transp, RSTATPROG, RSTATVERS_TIME, rstat_service, proto)) { 131 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_TIME, udp)."); 132 exit(1); 133 } 134 if (!svc_register(transp, RSTATPROG, RSTATVERS_SWTCH, rstat_service, proto)) { 135 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_SWTCH, udp)."); 136 exit(1); 137 } 138 if (!svc_register(transp, RSTATPROG, RSTATVERS_ORIG, rstat_service, proto)) { 139 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_ORIG, udp)."); 140 exit(1); 141 } 142 143 my_svc_run(); 144 syslog(LOG_ERR, "svc_run returned"); 145 exit(1); 146 } 147 148 void 149 my_svc_run(void) 150 { 151 extern volatile sig_atomic_t wantupdatestat; 152 extern void updatestat(void); 153 struct pollfd *pfd = NULL, *newp; 154 int nready, saved_max_pollfd = 0; 155 156 for (;;) { 157 if (wantupdatestat) { 158 wantupdatestat = 0; 159 updatestat(); 160 } 161 if (gotsig) { 162 (void) pmap_unset(RSTATPROG, RSTATVERS_TIME); 163 (void) pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 164 (void) pmap_unset(RSTATPROG, RSTATVERS_ORIG); 165 exit(0); 166 } 167 if (svc_max_pollfd > saved_max_pollfd) { 168 newp = realloc(pfd, sizeof(*pfd) * svc_max_pollfd); 169 if (newp == NULL) { 170 free(pfd); 171 perror("svc_run: - realloc failed"); 172 return; 173 } 174 pfd = newp; 175 saved_max_pollfd = svc_max_pollfd; 176 } 177 memcpy(pfd, svc_pollfd, sizeof(*pfd) * svc_max_pollfd); 178 179 nready = poll(pfd, svc_max_pollfd, INFTIM); 180 switch (nready) { 181 case -1: 182 if (errno == EINTR) 183 continue; 184 perror("svc_run: - poll failed"); 185 free(pfd); 186 return; 187 case 0: 188 continue; 189 default: 190 svc_getreq_poll(pfd, nready); 191 } 192 } 193 } 194