1 /* $OpenBSD: rstatd.c,v 1.30 2019/06/28 13:32:53 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 #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 /* ARGSUSED */ 55 static void 56 getsig(int signo) 57 { 58 gotsig = 1; 59 } 60 61 62 int 63 main(int argc, char *argv[]) 64 { 65 int sock = 0, proto = 0; 66 socklen_t fromlen; 67 struct passwd *pw; 68 struct sockaddr_storage from; 69 SVCXPRT *transp; 70 71 openlog("rpc.rstatd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON); 72 73 if ((pw = getpwnam("_rstatd")) == NULL) { 74 syslog(LOG_ERR, "no such user _rstatd"); 75 exit(1); 76 } 77 if (chroot("/var/empty") == -1) { 78 syslog(LOG_ERR, "cannot chdir to /var/empty."); 79 exit(1); 80 } 81 chdir("/"); 82 83 setgroups(1, &pw->pw_gid); 84 setegid(pw->pw_gid); 85 setgid(pw->pw_gid); 86 seteuid(pw->pw_uid); 87 setuid(pw->pw_uid); 88 89 if (argc == 2) 90 closedown = strtonum(argv[1], 1, INT_MAX, NULL); 91 if (closedown == 0) 92 closedown = 20; 93 94 /* 95 * See if inetd started us 96 */ 97 fromlen = sizeof(from); 98 if (getsockname(0, (struct sockaddr *)&from, &fromlen) == -1) { 99 from_inetd = 0; 100 sock = RPC_ANYSOCK; 101 proto = IPPROTO_UDP; 102 } 103 104 if (!from_inetd) { 105 daemon(0, 0); 106 107 (void)pmap_unset(RSTATPROG, RSTATVERS_TIME); 108 (void)pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 109 (void)pmap_unset(RSTATPROG, RSTATVERS_ORIG); 110 111 (void) signal(SIGINT, getsig); 112 (void) signal(SIGTERM, getsig); 113 (void) signal(SIGHUP, getsig); 114 } 115 116 transp = svcudp_create(sock); 117 if (transp == NULL) { 118 syslog(LOG_ERR, "cannot create udp service."); 119 exit(1); 120 } 121 if (!svc_register(transp, RSTATPROG, RSTATVERS_TIME, rstat_service, proto)) { 122 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_TIME, udp)."); 123 exit(1); 124 } 125 if (!svc_register(transp, RSTATPROG, RSTATVERS_SWTCH, rstat_service, proto)) { 126 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_SWTCH, udp)."); 127 exit(1); 128 } 129 if (!svc_register(transp, RSTATPROG, RSTATVERS_ORIG, rstat_service, proto)) { 130 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_ORIG, udp)."); 131 exit(1); 132 } 133 134 my_svc_run(); 135 syslog(LOG_ERR, "svc_run returned"); 136 exit(1); 137 } 138 139 void 140 my_svc_run(void) 141 { 142 extern volatile sig_atomic_t wantupdatestat; 143 extern void updatestat(void); 144 struct pollfd *pfd = NULL, *newp; 145 int nready, saved_max_pollfd = 0; 146 147 for (;;) { 148 if (wantupdatestat) { 149 wantupdatestat = 0; 150 updatestat(); 151 } 152 if (gotsig) { 153 (void) pmap_unset(RSTATPROG, RSTATVERS_TIME); 154 (void) pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 155 (void) pmap_unset(RSTATPROG, RSTATVERS_ORIG); 156 exit(0); 157 } 158 if (svc_max_pollfd > saved_max_pollfd) { 159 newp = reallocarray(pfd, svc_max_pollfd, sizeof(*pfd)); 160 if (newp == NULL) { 161 free(pfd); 162 perror("svc_run: - realloc failed"); 163 return; 164 } 165 pfd = newp; 166 saved_max_pollfd = svc_max_pollfd; 167 } 168 memcpy(pfd, svc_pollfd, svc_max_pollfd * sizeof(*pfd)); 169 170 nready = poll(pfd, svc_max_pollfd, INFTIM); 171 switch (nready) { 172 case -1: 173 if (errno == EINTR) 174 continue; 175 perror("svc_run: - poll failed"); 176 free(pfd); 177 return; 178 case 0: 179 continue; 180 default: 181 svc_getreq_poll(pfd, nready); 182 } 183 } 184 } 185