1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995, 1996 5 * Bill Paul <wpaul@ctr.columbia.edu>. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Bill Paul. 18 * 4. Neither the name of the author nor the names of any co-contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "ypupdate_prot.h" 39 #include <stdio.h> 40 #include <stdlib.h> /* getenv, exit */ 41 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 42 #include <rpc/rpc_com.h> 43 #include <string.h> /* strcmp */ 44 #include <signal.h> 45 #ifdef __cplusplus 46 #include <sysent.h> /* getdtablesize, open */ 47 #endif /* __cplusplus */ 48 #include <memory.h> 49 #include <sys/socket.h> 50 #include <netinet/in.h> 51 #include <syslog.h> 52 #include <sys/wait.h> 53 #include <errno.h> 54 #include <err.h> 55 #include <unistd.h> 56 #include "ypupdated_extern.h" 57 #include "yp_extern.h" 58 59 #ifndef SIG_PF 60 #define SIG_PF void(*)(int) 61 #endif 62 63 #ifdef DEBUG 64 #define RPC_SVC_FG 65 #endif 66 67 #define _RPCSVC_CLOSEDOWN 120 68 int _rpcpmstart; /* Started by a port monitor ? */ 69 static int _rpcfdtype; 70 /* Whether Stream or Datagram ? */ 71 /* States a server can be in wrt request */ 72 73 #define _IDLE 0 74 #define _SERVED 1 75 #define _SERVING 2 76 77 extern int _rpcsvcstate; /* Set when a request is serviced */ 78 79 int debug; 80 81 char *progname = "rpc.ypupdated"; 82 char *yp_dir = "/var/yp/"; 83 84 static void 85 _msgout(char* msg) 86 { 87 #ifdef RPC_SVC_FG 88 if (_rpcpmstart) 89 syslog(LOG_ERR, "%s", msg); 90 else 91 warnx("%s", msg); 92 #else 93 syslog(LOG_ERR, "%s", msg); 94 #endif 95 } 96 97 static void 98 closedown(int sig) 99 { 100 if (_rpcsvcstate == _IDLE) { 101 extern fd_set svc_fdset; 102 static int size; 103 int i, openfd; 104 105 if (_rpcfdtype == SOCK_DGRAM) 106 exit(0); 107 if (size == 0) { 108 size = getdtablesize(); 109 } 110 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 111 if (FD_ISSET(i, &svc_fdset)) 112 openfd++; 113 if (openfd <= 1) 114 exit(0); 115 } 116 if (_rpcsvcstate == _SERVED) 117 _rpcsvcstate = _IDLE; 118 119 (void) signal(SIGALRM, (SIG_PF) closedown); 120 (void) alarm(_RPCSVC_CLOSEDOWN/2); 121 } 122 123 static void 124 ypupdated_svc_run(void) 125 { 126 #ifdef FD_SETSIZE 127 fd_set readfds; 128 #else 129 int readfds; 130 #endif /* def FD_SETSIZE */ 131 extern int forked; 132 int pid; 133 int fd_setsize = _rpc_dtablesize(); 134 135 /* Establish the identity of the parent ypupdated process. */ 136 pid = getpid(); 137 138 for (;;) { 139 #ifdef FD_SETSIZE 140 readfds = svc_fdset; 141 #else 142 readfds = svc_fds; 143 #endif /* def FD_SETSIZE */ 144 switch (select(fd_setsize, &readfds, NULL, NULL, 145 (struct timeval *)0)) { 146 case -1: 147 if (errno == EINTR) { 148 continue; 149 } 150 warn("svc_run: - select failed"); 151 return; 152 case 0: 153 continue; 154 default: 155 svc_getreqset(&readfds); 156 if (forked && pid != getpid()) 157 exit(0); 158 } 159 } 160 } 161 162 static void 163 reaper(int sig) 164 { 165 int status; 166 167 if (sig == SIGHUP) { 168 #ifdef foo 169 load_securenets(); 170 #endif 171 return; 172 } 173 174 if (sig == SIGCHLD) { 175 while (wait3(&status, WNOHANG, NULL) > 0) 176 children--; 177 } else { 178 (void) pmap_unset(YPU_PROG, YPU_VERS); 179 exit(0); 180 } 181 } 182 183 void 184 usage(void) 185 { 186 fprintf(stderr, "rpc.ypupdatedd [-p path]\n"); 187 exit(0); 188 } 189 190 int 191 main(int argc, char *argv[]) 192 { 193 register SVCXPRT *transp = NULL; 194 int sock; 195 int proto = 0; 196 struct sockaddr_in saddr; 197 int asize = sizeof (saddr); 198 int ch; 199 200 while ((ch = getopt(argc, argv, "p:h")) != -1) { 201 switch (ch) { 202 case 'p': 203 yp_dir = optarg; 204 break; 205 default: 206 usage(); 207 break; 208 } 209 } 210 #ifdef foo 211 load_securenets(); 212 #endif 213 214 if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) { 215 yp_error("failed to register AUTH_DES flavor"); 216 exit(1); 217 } 218 219 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 220 int ssize = sizeof (int); 221 222 if (saddr.sin_family != AF_INET) 223 exit(1); 224 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 225 (char *)&_rpcfdtype, &ssize) == -1) 226 exit(1); 227 sock = 0; 228 _rpcpmstart = 1; 229 proto = 0; 230 openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON); 231 } else { 232 #ifndef RPC_SVC_FG 233 if (daemon(0,0)) { 234 err(1, "cannot fork"); 235 } 236 openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON); 237 #endif 238 sock = RPC_ANYSOCK; 239 (void) pmap_unset(YPU_PROG, YPU_VERS); 240 } 241 242 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 243 transp = svcudp_create(sock); 244 if (transp == NULL) { 245 _msgout("cannot create udp service."); 246 exit(1); 247 } 248 if (!_rpcpmstart) 249 proto = IPPROTO_UDP; 250 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 251 _msgout("unable to register (YPU_PROG, YPU_VERS, udp)."); 252 exit(1); 253 } 254 } 255 256 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 257 transp = svctcp_create(sock, 0, 0); 258 if (transp == NULL) { 259 _msgout("cannot create tcp service."); 260 exit(1); 261 } 262 if (!_rpcpmstart) 263 proto = IPPROTO_TCP; 264 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 265 _msgout("unable to register (YPU_PROG, YPU_VERS, tcp)."); 266 exit(1); 267 } 268 } 269 270 if (transp == (SVCXPRT *)NULL) { 271 _msgout("could not create a handle"); 272 exit(1); 273 } 274 if (_rpcpmstart) { 275 (void) signal(SIGALRM, (SIG_PF) closedown); 276 (void) alarm(_RPCSVC_CLOSEDOWN/2); 277 } 278 279 (void) signal(SIGPIPE, SIG_IGN); 280 (void) signal(SIGCHLD, (SIG_PF) reaper); 281 (void) signal(SIGTERM, (SIG_PF) reaper); 282 (void) signal(SIGINT, (SIG_PF) reaper); 283 (void) signal(SIGHUP, (SIG_PF) reaper); 284 285 ypupdated_svc_run(); 286 _msgout("svc_run returned"); 287 exit(1); 288 /* NOTREACHED */ 289 } 290