1 /* $OpenBSD: rstatd.c,v 1.31 2023/03/08 04:43:05 guenther 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 #include <sys/types.h> 32 #include <sys/socket.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <unistd.h> 37 #include <limits.h> 38 #include <signal.h> 39 #include <pwd.h> 40 #include <syslog.h> 41 #include <errno.h> 42 #include <rpc/rpc.h> 43 #include <rpcsvc/rstat.h> 44 45 extern void rstat_service(struct svc_req *, SVCXPRT *); 46 47 void my_svc_run(void); 48 49 int from_inetd = 1; /* started from inetd ? */ 50 int closedown = 20; /* how long to wait before going dormant */ 51 52 volatile sig_atomic_t gotsig; 53 54 static void 55 getsig(int signo) 56 { 57 gotsig = 1; 58 } 59 60 61 int 62 main(int argc, char *argv[]) 63 { 64 int sock = 0, proto = 0; 65 socklen_t fromlen; 66 struct passwd *pw; 67 struct sockaddr_storage from; 68 SVCXPRT *transp; 69 70 openlog("rpc.rstatd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON); 71 72 if ((pw = getpwnam("_rstatd")) == NULL) { 73 syslog(LOG_ERR, "no such user _rstatd"); 74 exit(1); 75 } 76 if (chroot("/var/empty") == -1) { 77 syslog(LOG_ERR, "cannot chdir to /var/empty."); 78 exit(1); 79 } 80 chdir("/"); 81 82 setgroups(1, &pw->pw_gid); 83 setegid(pw->pw_gid); 84 setgid(pw->pw_gid); 85 seteuid(pw->pw_uid); 86 setuid(pw->pw_uid); 87 88 if (argc == 2) 89 closedown = strtonum(argv[1], 1, INT_MAX, NULL); 90 if (closedown == 0) 91 closedown = 20; 92 93 /* 94 * See if inetd started us 95 */ 96 fromlen = sizeof(from); 97 if (getsockname(0, (struct sockaddr *)&from, &fromlen) == -1) { 98 from_inetd = 0; 99 sock = RPC_ANYSOCK; 100 proto = IPPROTO_UDP; 101 } 102 103 if (!from_inetd) { 104 daemon(0, 0); 105 106 (void)pmap_unset(RSTATPROG, RSTATVERS_TIME); 107 (void)pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 108 (void)pmap_unset(RSTATPROG, RSTATVERS_ORIG); 109 110 (void) signal(SIGINT, getsig); 111 (void) signal(SIGTERM, getsig); 112 (void) signal(SIGHUP, getsig); 113 } 114 115 transp = svcudp_create(sock); 116 if (transp == NULL) { 117 syslog(LOG_ERR, "cannot create udp service."); 118 exit(1); 119 } 120 if (!svc_register(transp, RSTATPROG, RSTATVERS_TIME, rstat_service, proto)) { 121 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_TIME, udp)."); 122 exit(1); 123 } 124 if (!svc_register(transp, RSTATPROG, RSTATVERS_SWTCH, rstat_service, proto)) { 125 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_SWTCH, udp)."); 126 exit(1); 127 } 128 if (!svc_register(transp, RSTATPROG, RSTATVERS_ORIG, rstat_service, proto)) { 129 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_ORIG, udp)."); 130 exit(1); 131 } 132 133 my_svc_run(); 134 syslog(LOG_ERR, "svc_run returned"); 135 exit(1); 136 } 137 138 void 139 my_svc_run(void) 140 { 141 extern volatile sig_atomic_t wantupdatestat; 142 extern void updatestat(void); 143 struct pollfd *pfd = NULL, *newp; 144 int nready, saved_max_pollfd = 0; 145 146 for (;;) { 147 if (wantupdatestat) { 148 wantupdatestat = 0; 149 updatestat(); 150 } 151 if (gotsig) { 152 (void) pmap_unset(RSTATPROG, RSTATVERS_TIME); 153 (void) pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 154 (void) pmap_unset(RSTATPROG, RSTATVERS_ORIG); 155 exit(0); 156 } 157 if (svc_max_pollfd > saved_max_pollfd) { 158 newp = reallocarray(pfd, svc_max_pollfd, sizeof(*pfd)); 159 if (newp == NULL) { 160 free(pfd); 161 perror("svc_run: - realloc failed"); 162 return; 163 } 164 pfd = newp; 165 saved_max_pollfd = svc_max_pollfd; 166 } 167 memcpy(pfd, svc_pollfd, svc_max_pollfd * sizeof(*pfd)); 168 169 nready = poll(pfd, svc_max_pollfd, INFTIM); 170 switch (nready) { 171 case -1: 172 if (errno == EINTR) 173 continue; 174 perror("svc_run: - poll failed"); 175 free(pfd); 176 return; 177 case 0: 178 continue; 179 default: 180 svc_getreq_poll(pfd, nready); 181 } 182 } 183 } 184