1 /* $OpenBSD: rstatd.c,v 1.21 2005/09/16 23:50:33 deraadt 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 1.21 2005/09/16 23:50:33 deraadt 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 pw = getpwnam("_rstatd"); 81 if (!pw) 82 pw = getpwnam("nobody"); 83 if (chroot("/var/empty") == -1) { 84 syslog(LOG_ERR, "cannot chdir to /var/empty."); 85 exit(1); 86 } 87 chdir("/"); 88 89 if (pw) { 90 setgroups(1, &pw->pw_gid); 91 setegid(pw->pw_gid); 92 setgid(pw->pw_gid); 93 seteuid(pw->pw_uid); 94 setuid(pw->pw_uid); 95 } 96 97 if (argc == 2) 98 closedown = atoi(argv[1]); 99 if (closedown <= 0) 100 closedown = 20; 101 102 /* 103 * See if inetd started us 104 */ 105 fromlen = sizeof(from); 106 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) { 107 from_inetd = 0; 108 sock = RPC_ANYSOCK; 109 proto = IPPROTO_UDP; 110 } 111 112 if (!from_inetd) { 113 daemon(0, 0); 114 115 (void)pmap_unset(RSTATPROG, RSTATVERS_TIME); 116 (void)pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 117 (void)pmap_unset(RSTATPROG, RSTATVERS_ORIG); 118 119 (void) signal(SIGINT, getsig); 120 (void) signal(SIGTERM, getsig); 121 (void) signal(SIGHUP, getsig); 122 } 123 124 transp = svcudp_create(sock); 125 if (transp == NULL) { 126 syslog(LOG_ERR, "cannot create udp service."); 127 exit(1); 128 } 129 if (!svc_register(transp, RSTATPROG, RSTATVERS_TIME, rstat_service, proto)) { 130 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_TIME, udp)."); 131 exit(1); 132 } 133 if (!svc_register(transp, RSTATPROG, RSTATVERS_SWTCH, rstat_service, proto)) { 134 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_SWTCH, udp)."); 135 exit(1); 136 } 137 if (!svc_register(transp, RSTATPROG, RSTATVERS_ORIG, rstat_service, proto)) { 138 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_ORIG, udp)."); 139 exit(1); 140 } 141 142 my_svc_run(); 143 syslog(LOG_ERR, "svc_run returned"); 144 exit(1); 145 } 146 147 void 148 my_svc_run(void) 149 { 150 extern volatile sig_atomic_t wantupdatestat; 151 extern void updatestat(void); 152 struct pollfd *pfd = NULL, *newp; 153 int nready, saved_max_pollfd = 0; 154 155 for (;;) { 156 if (wantupdatestat) { 157 wantupdatestat = 0; 158 updatestat(); 159 } 160 if (gotsig) { 161 (void) pmap_unset(RSTATPROG, RSTATVERS_TIME); 162 (void) pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 163 (void) pmap_unset(RSTATPROG, RSTATVERS_ORIG); 164 exit(0); 165 } 166 if (svc_max_pollfd > saved_max_pollfd) { 167 newp = realloc(pfd, sizeof(*pfd) * svc_max_pollfd); 168 if (newp == NULL) { 169 free(pfd); 170 perror("svc_run: - realloc failed"); 171 return; 172 } 173 pfd = newp; 174 saved_max_pollfd = svc_max_pollfd; 175 } 176 memcpy(pfd, svc_pollfd, sizeof(*pfd) * svc_max_pollfd); 177 178 nready = poll(pfd, svc_max_pollfd, INFTIM); 179 switch (nready) { 180 case -1: 181 if (errno == EINTR) 182 continue; 183 perror("svc_run: - poll failed"); 184 free(pfd); 185 return; 186 case 0: 187 continue; 188 default: 189 svc_getreq_poll(pfd, nready); 190 } 191 } 192 } 193