1 /* $OpenBSD: rstatd.c,v 1.27 2015/04/18 18:28:37 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 const char *errstr; 70 SVCXPRT *transp; 71 72 openlog("rpc.rstatd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON); 73 74 if ((pw = getpwnam("_rstatd")) == NULL) { 75 syslog(LOG_ERR, "no such user _rstatd"); 76 exit(1); 77 } 78 if (chroot("/var/empty") == -1) { 79 syslog(LOG_ERR, "cannot chdir to /var/empty."); 80 exit(1); 81 } 82 chdir("/"); 83 84 if (pw) { 85 setgroups(1, &pw->pw_gid); 86 setegid(pw->pw_gid); 87 setgid(pw->pw_gid); 88 seteuid(pw->pw_uid); 89 setuid(pw->pw_uid); 90 } 91 92 if (argc == 2) 93 closedown = strtonum(argv[1], 1, INT_MAX, NULL); 94 if (closedown == 0) 95 closedown = 20; 96 97 /* 98 * See if inetd started us 99 */ 100 fromlen = sizeof(from); 101 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) { 102 from_inetd = 0; 103 sock = RPC_ANYSOCK; 104 proto = IPPROTO_UDP; 105 } 106 107 if (!from_inetd) { 108 daemon(0, 0); 109 110 (void)pmap_unset(RSTATPROG, RSTATVERS_TIME); 111 (void)pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 112 (void)pmap_unset(RSTATPROG, RSTATVERS_ORIG); 113 114 (void) signal(SIGINT, getsig); 115 (void) signal(SIGTERM, getsig); 116 (void) signal(SIGHUP, getsig); 117 } 118 119 transp = svcudp_create(sock); 120 if (transp == NULL) { 121 syslog(LOG_ERR, "cannot create udp service."); 122 exit(1); 123 } 124 if (!svc_register(transp, RSTATPROG, RSTATVERS_TIME, rstat_service, proto)) { 125 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_TIME, udp)."); 126 exit(1); 127 } 128 if (!svc_register(transp, RSTATPROG, RSTATVERS_SWTCH, rstat_service, proto)) { 129 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_SWTCH, udp)."); 130 exit(1); 131 } 132 if (!svc_register(transp, RSTATPROG, RSTATVERS_ORIG, rstat_service, proto)) { 133 syslog(LOG_ERR, "unable to register (RSTATPROG, RSTATVERS_ORIG, udp)."); 134 exit(1); 135 } 136 137 my_svc_run(); 138 syslog(LOG_ERR, "svc_run returned"); 139 exit(1); 140 } 141 142 void 143 my_svc_run(void) 144 { 145 extern volatile sig_atomic_t wantupdatestat; 146 extern void updatestat(void); 147 struct pollfd *pfd = NULL, *newp; 148 int nready, saved_max_pollfd = 0; 149 150 for (;;) { 151 if (wantupdatestat) { 152 wantupdatestat = 0; 153 updatestat(); 154 } 155 if (gotsig) { 156 (void) pmap_unset(RSTATPROG, RSTATVERS_TIME); 157 (void) pmap_unset(RSTATPROG, RSTATVERS_SWTCH); 158 (void) pmap_unset(RSTATPROG, RSTATVERS_ORIG); 159 exit(0); 160 } 161 if (svc_max_pollfd > saved_max_pollfd) { 162 newp = reallocarray(pfd, svc_max_pollfd, sizeof(*pfd)); 163 if (newp == NULL) { 164 free(pfd); 165 perror("svc_run: - realloc failed"); 166 return; 167 } 168 pfd = newp; 169 saved_max_pollfd = svc_max_pollfd; 170 } 171 memcpy(pfd, svc_pollfd, svc_max_pollfd * sizeof(*pfd)); 172 173 nready = poll(pfd, svc_max_pollfd, INFTIM); 174 switch (nready) { 175 case -1: 176 if (errno == EINTR) 177 continue; 178 perror("svc_run: - poll failed"); 179 free(pfd); 180 return; 181 case 0: 182 continue; 183 default: 184 svc_getreq_poll(pfd, nready); 185 } 186 } 187 } 188